WO2017050072A1 - Water chiller-heater unit of air cooled heat pump and defrosting control method therefor - Google Patents

Abstract

Provided are a water chiller-heater unit of an air cooled heat pump and a defrosting control method therefor. The water chiller-heater unit of the air cooled heat pump comprises: N modular units (100), water outlet pipes of the modular units (100) being separately connected to a total water inlet pipe of the water chiller-heater unit of the air cooled heat pump, so as to realize parallel connection of the N modular units (100), N being an integer greater than 2; a first temperature detection module, used for detecting an outdoor environment temperature (T4); an acquisition module, used for acquiring running parameters of each modular unit (100); and a control module, used for determining, according to the outdoor environment temperature (T4), whether to control the water chiller-heater unit of the air cooled heat pump to run in an alternate defrosting manner when the water chiller-heater unit of the air cooled heat pump enters a defrosting mode. The defrosting control method for the water chiller-heater unit of the air cooled heat pump comprises: the water chiller-heater unit of the air cooled heat pump runs in an alternate defrosting manner, and a control module controls at least one of N modular units (100) to be started, keeps at least one of the N modular units (100) in a stop state, controls, according to an outdoor environment temperature (T4) and running parameters of any of the started modular units (100), any of the started modular units (100) and any of the modular units (100) in the stop state to run in an alternate heating manner, and keeps a fan (10) in any of the started modular units (100) and a fan (10) in any of the modular units (100) in the stop state to run continuously, so as to defrost by means of forced-convection heat transfer of the fans (10).

Description

Air-cooled heat pump water chiller unit and defrosting control method thereof Technical field

The invention relates to the technical field of air conditioners, in particular to a defrosting control method for an air-cooled heat pump cold and hot water unit and an air-cooling heat pump cold and hot water unit.

Background technique

For the air heat pump type air conditioner, it is necessary to absorb heat from the air during the heating operation, but the change of the ambient temperature causes the air conditioner side heat exchanger to frost, which causes the air heat pump type air conditioner to have lower heating capacity and energy efficiency. In order to avoid the deterioration of the heating effect, the air heat pump type air conditioner operates the defrosting mode for defrosting, and the defrosting mode does not heat, and finally has a great influence on the overall heating effect.

In the related art, when the air heat pump type air conditioner is in the defrosting process, the compressor is operated, the four-way valve is reversed, and the fan is stopped at the same time, the air heat pump type air conditioner is switched to the cooling operation, and the high temperature refrigerant is used for defrosting, and when the frost is completely melted After that, quit the defrosting and then continue to heat. It can be seen that the defrosting process is a cooling process, which will affect the water temperature, thereby affecting the overall machine capacity and affecting the user experience.

Summary of the invention

The present invention aims to solve at least one of the technical problems in the above-mentioned techniques to some extent. Therefore, an object of the present invention is to provide a defrosting control method for an air-cooled heat pump cold and hot water unit, which does not need to be converted into a cooling operation and a fan stop for defrosting, but is switched by controlling the module machine to utilize The fan itself continues to operate to defoase, improve the heating effect of the air-cooled heat pump hot and cold water unit, and improve the user experience.

Another object of the present invention is to provide an air-cooled heat pump water chiller unit.

In order to achieve the above object, an embodiment of the present invention provides a defrosting control method for an air-cooled heat pump cold and hot water unit, wherein the air-cooled heat pump cold and hot water unit includes N modular machines, and N is an integer greater than or equal to 2. The outlet pipes of each of the modular machines are respectively connected to the total outlet pipes of the air-cooled heat pump hot and cold water units, and the inlet pipes of each of the modular machines are respectively connected to the air-cooled heat pump hot and cold water units a total inlet pipe to achieve parallel connection of the N modular machines, each of the modular machines comprising a plurality of hot water systems, each of the hot water systems comprising a compressor and an air conditioning heat exchanger, said The frost control method comprises the following steps: detecting the outdoor ambient temperature T4 in real time, and obtaining the operating parameters of each of the modular machines; when the air-cooled heat pump hot and cold water unit enters the defrosting mode, determining according to the outdoor ambient temperature T4 Whether to control the air-cooled heat pump water chiller unit to operate in a rotating defrosting mode; if the air-cooling heat pump chiller unit operates in a rotating defrosting mode, controlling at least one of the N module machines to be turned on, And protect At least one module of the N machine module machine is shut down; and controlling the operating parameters according to the outdoor ambient temperature T4 and opening machine of any module Any one of the modular machines that are turned on alternates with the heating of any of the modular machines in the stopped state, and keeps the fan in any of the opened modular machines and the fan in any of the modular machines in the stopped state continuously running, Defrost by forced convection heat transfer of the fan.

According to the defrosting control method of the air-cooled heat pump water chiller unit according to the embodiment of the present invention, when the air-cooling heat pump cold and hot water unit is operated in the rotation defrosting mode by the outdoor environment temperature T4 detected in real time, the N module machines are controlled. At least one module machine is turned on, and at least one of the N modular machines is stopped, and then any module that is turned on is controlled according to the outdoor ambient temperature T4 and the operating parameters of any of the opened modular machines. Any modular machine in the state alternately performs heating operation, and keeps the fan in any of the module machines that are turned on and the fan in any module machine in the stopped state continue to operate, thereby performing defrosting by forced convection heat transfer of the fan. Therefore, it is not necessary to convert into a cooling operation and a fan stop to perform defrosting, thereby reducing the heating attenuation during heating and defrosting, greatly improving the heating effect of the air-cooling heat pump chiller and hot water unit, and improving the user experience.

The operating parameters of each of the modular machines include an influent water temperature Tin corresponding to each of the modular machines, an outlet water temperature Tout corresponding to each of the modular machines, and each of the air conditioning heat exchangers in each of the modular machines. The inlet temperature T3, the low pressure side pressure of each compressor in each of the modular machines.

In order to achieve the above object, an embodiment of the present invention provides a defrosting control method for an air-cooled heat pump cold and hot water unit, wherein the air-cooled heat pump hot and cold water unit includes N modular machines, and N is greater than or equal to 2 An integral number, the outlet pipes of each of the modular machines are respectively connected to the total outlet pipes of the air-cooled heat pump cold and hot water unit, and the inlet pipes of each of the modular machines are respectively connected to the air-cooled heat pump The total water inlet pipe of the water unit is configured to realize the parallel connection of the N module machines, and the defrosting control method comprises the following steps: detecting the outdoor environment temperature T4 in real time and the inlet water temperature Tin corresponding to each of the module machines; When the air-cooling heat pump hot and cold water unit enters the defrosting mode, it is determined according to the outdoor ambient temperature T4 whether to control the air-cooled heat pump cold and hot water unit to operate in a rotating defrosting mode; if the air-cooled heat pump hot and cold water unit Operating in a rotating defrosting mode, controlling at least one of the N modular machines to be turned on, and maintaining at least one of the N modular machines in a shutdown state; and according to the outdoor ambient temperature T4 and the inlet water temperature Tin of any module machine that is turned on controls any module machine that is turned on to alternately heat operation with any module machine in the shutdown state, and keeps the fan in the module machine that is turned on and is in shutdown. The fan in any of the modular machines is continuously operated to defrost by forced convection heat transfer from the fan.

According to the defrosting control method of the air-cooled heat pump water chiller unit according to the embodiment of the present invention, when the air-cooling heat pump cold and hot water unit is operated in the rotation defrosting mode by the outdoor environment temperature T4 detected in real time, the N module machines are controlled. At least one module machine is turned on, and at least one of the N modular machines is kept in a shutdown state, and then any module that is turned on is controlled according to the outdoor ambient temperature T4 and the inlet water temperature Tin of any of the opened modular machines. Any modular machine in the shutdown state alternates heating operation, and keeps the fan in any module machine that is turned on and the fan in any module machine in the shutdown state continue to operate to defoam by forced convection heat transfer of the fan. , so there is no need to convert to cooling operation and stop the wind The machine is used for defrosting, reducing the heating attenuation during heating and defrosting, greatly improving the heating effect of the air-cooled heat pump chiller and hot water unit, and improving the user experience.

According to an embodiment of the present invention, when the air-cooled heat pump cold and hot water unit enters a defrosting mode, wherein the outdoor air temperature T4 is greater than the first preset temperature, the air-cooled heat pump is controlled to be hot and cold The unit operates in a rotating defrosting mode; if the outdoor ambient temperature T4 is less than or equal to the first preset temperature, the air-cooled heat pump hot and cold water unit is controlled to operate in a conventional defrosting mode.

According to an embodiment of the present invention, when any of the module machines that are turned on is the main module machine, and any of the module machines that are in the shutdown state is the first slave module machine, the outdoor environment temperature T4 and the open The inlet water temperature Tin of a modular machine controls the heating operation of any modular machine that is turned on and any modular machine that is in the shutdown state, and specifically includes: a1, controlling the compressor in the main modular machine to be turned on to enable the main The module mechanism is hot running, and after the first preset time of the main module machine performing the heating operation, determining whether the outdoor ambient temperature T4 and the inlet water temperature Tin of the main module machine meet the first preset condition; b1 If it is determined that the outdoor ambient temperature T4 and the inlet water temperature Tin of the main modular machine meet the first preset condition, controlling the main modular machine to enter a frost accumulation mode, and acquiring the main modular machine Accumulating the frosting time; c1, when the accumulated frosting time of the main modular machine reaches the first time threshold, controlling the compressor in the main modular machine to stop, the fan in the main modular machine continues to run, and controls Said Activating from a compressor in the module machine to cause the first slave module mechanism to operate thermally, and determining the outdoor ambient temperature T4 and the location after the first slave module machine performs a heating operation for a second predetermined time Whether the inlet water temperature Tin of the first slave module machine satisfies the second preset condition; d1, if it is determined that the outdoor ambient temperature T4 and the inlet water temperature Tin of the first slave module machine satisfy the second preset condition And controlling the first slave module machine to enter a frost accumulation mode, and acquiring a cumulative frosting time of the first slave module machine; e1, when the cumulative frosting time of the first slave module machine reaches a second time At the threshold, the compressor in the first slave module machine is controlled to stop, the fan in the first slave module machine continues to run, and the process returns to step a1.

According to an embodiment of the present invention, in step a1, if it is determined that the outdoor ambient temperature T4 and the inlet water temperature Tin of the main modular machine do not satisfy the first preset condition, then the main module system is controlled. After continuing the heating operation for the third preset time, returning to continue to determine whether the outdoor ambient temperature T4 and the inlet water temperature Tin of the main modular machine meet the first preset condition.

According to an embodiment of the present invention, in step c1, if it is determined that the outdoor ambient temperature T4 and the inflow water temperature Tin of the first slave module machine do not satisfy the second preset condition, then the first After the module machine continues the heating operation for a fourth preset time, it returns to continue to determine whether the outdoor ambient temperature T4 and the inlet water temperature Tin of the first slave module machine satisfy the second preset condition.

In order to achieve the above object, an air-cooled heat pump cold and hot water unit according to another embodiment of the present invention includes: N modular machines, and outlet pipes of each of the modular machines are respectively connected to the air-cooled heat pump to be cooled. a total outlet pipe of the hot water unit, wherein each inlet pipe of the modular machine is respectively connected to a total inlet pipe of the air-cooled heat pump hot and cold water unit to achieve the N module machines are connected in parallel, wherein N is an integer greater than or equal to 2; a first temperature detecting module is configured to detect an outdoor ambient temperature T4 in real time; and a second temperature detecting module is configured to detect each of the module machines in real time. Inflow water temperature Tin; a control module, configured to determine, according to the outdoor ambient temperature T4, whether to control the air-cooled heat pump cold and hot water unit to operate in a rotating defrosting mode when the air-cooling heat pump cold and hot water unit enters a defrosting mode The control module controls at least one of the N modular machines to be turned on, and maintains at least one of the N modular machines, if the air-cooled heat pump hot and cold water unit operates in a rolling defrosting mode a modular machine is in a shutdown state, and according to the outdoor ambient temperature T4 and the inlet water temperature Tin of any modular machine that is turned on, any modular machine that is turned on is alternately heated with any modular machine that is in a shutdown state, and The fan in any of the modular machines that are turned on is continuously operated with the fan in any of the modular machines in the stopped state to be defrosted by forced convection heat transfer of the fan.

According to the air-cooled heat pump water chiller unit according to the embodiment of the present invention, when operating in the rotation defrosting mode, the control module controls at least one of the N modular machines to be turned on, and maintains at least one of the N modular machines In the stop state, then according to the outdoor ambient temperature T4 and the inlet water temperature Tin of any modular machine that is turned on, the control of any of the open modular machines and any modular machine in the stopped state is alternately heated, and the open operation is maintained. The fan in a modular machine and the fan in any modular machine in the stop state continue to operate to defrose by forced convection heat transfer of the fan, that is, by switching between the modular machines, using the continuous operation of the fan itself The defrosting eliminates the need to convert the cooling operation and stop the fan to reduce the heating, reduce the heating attenuation during the heating and defrosting, greatly improve the heating effect and improve the user experience.

According to an embodiment of the present invention, when the air-cooled heat pump cold and hot water unit enters a defrosting mode, wherein the control module controls the air cooling if the outdoor ambient temperature T4 is greater than a first preset temperature The heat pump hot and cold water unit operates in a rotating defrosting mode; if the outdoor ambient temperature T4 is less than or equal to the first preset temperature, the control module controls the air-cooled heat pump cold and hot water unit to perform conventional defrosting mode run.

According to an embodiment of the present invention, when any of the module machines that are turned on is the main module machine, and any of the module machines that are in the shutdown state is the first slave module machine, the control module controls the main control by the following control flow. The module machine and the first slave module machine alternately perform heating operation: a1, controlling a compressor in the main module machine to be powered on to enable the main module mechanism to operate thermally, and performing heating operation on the main module machine After a preset time, determining whether the outdoor ambient temperature T4 and the inlet water temperature Tin of the main modular machine meet the first preset condition; b1, if the outdoor ambient temperature T4 and the main modular machine are determined to enter The water temperature Tin meets the first preset condition, then controls the main module machine to enter a frost accumulation mode, and acquires a cumulative frosting time of the main module machine; c1, when the main module machine accumulates frost When the time reaches the first time threshold, the compressor in the main module machine is controlled to stop, the fan in the main module machine continues to operate, and the compressor in the first slave module machine is controlled to be turned on to enable the first Slave module machine The heating operation, and after the second slave module machine performs the heating operation for a second predetermined time, determining whether the outdoor ambient temperature T4 and the inlet water temperature Tin of the first slave module machine meet the second preset a condition; d1, if it is determined that the outdoor ambient temperature T4 and the inlet water temperature Tin of the first slave module machine meet the second preset condition, controlling the first slave module machine to enter a frost accumulation mode, And acquiring the accumulated frosting time of the first slave module machine; e1, controlling the compressor stop in the first slave module machine when the accumulated frosting time of the first slave module machine reaches a second time threshold The fan in the first slave module machine continues to run and returns to step a1.

According to an embodiment of the present invention, if it is determined that the outdoor ambient temperature T4 and the inlet water temperature Tin of the main module machine do not satisfy the first preset condition, the control module controls the main module system to continue. After the heating operation is performed for the third preset time, the process returns to determine whether the outdoor ambient temperature T4 and the inlet water temperature Tin of the main module machine satisfy the first preset condition.

According to an embodiment of the present invention, if it is determined that the outdoor ambient temperature T4 and the inlet water temperature Tin of the first slave module machine do not satisfy the second preset condition, the control module controls the first slave After the module machine continues to operate for a fourth predetermined time, it returns to continue to determine whether the outdoor ambient temperature T4 and the inlet water temperature Tin of the first slave module machine satisfy the second preset condition.

In order to achieve the above object, an embodiment of the present invention provides a defrosting control method for an air-cooled heat pump cold and hot water unit, wherein the air-cooled heat pump hot and cold water unit includes N modular machines, and N is greater than or equal to 2 An integral number, the outlet pipes of each of the modular machines are respectively connected to the total outlet pipes of the air-cooled heat pump cold and hot water unit, and the inlet pipes of each of the modular machines are respectively connected to the air-cooled heat pump a total inlet pipe of the water unit to realize parallel connection of the N modular machines, each of the modular machines comprising a plurality of hot water systems, each of the hot water systems including a compressor and an air conditioner heat exchanger The defrosting control method comprises the following steps: detecting the outdoor ambient temperature T4 in real time, and detecting the inlet temperature T3 of each air conditioner heat exchanger in each of the modular machines in real time; according to the inlet temperature of each air conditioner heat exchanger detected in real time T3 obtains an inlet temperature change rate ΔT3 of each air conditioner heat exchanger; when the air-cooled heat pump hot and cold water unit enters a defrosting mode, determines whether to control the air-cooled heat pump hot and cold water according to the outdoor ambient temperature T4 Unit with wheel a defrosting mode operation; if the air-cooled heat pump chiller unit operates in a rolling defrosting mode, controlling at least one of the N module machines to be turned on, and maintaining at least one of the N module machines The machine is in a stop state; and the inlet temperature change rate ΔT3a of each air conditioner heat exchanger corresponding to any modular machine that is turned on and the inlet temperature change rate of each air conditioner heat exchanger corresponding to any module machine in the shutdown state △T3b controls any module machine that is turned on to alternate heating operation with any module machine in the shutdown state, and keeps the fan in any module machine that is turned on and the fan in any module machine in the shutdown state continue to run. To defrost by forced convection heat transfer by a fan.

According to the defrosting control method of the air-cooled heat pump cold and hot water unit according to the embodiment of the present invention, the outdoor ambient temperature T4 is detected in real time, and the inlet temperature T3 of each air conditioner heat exchanger in each modular machine is detected in real time, and then detected in real time. The outdoor ambient temperature T4 determines that the air-cooled heat pump hot and cold water unit operates in the rotating defrosting mode, controls at least one of the N modular machines to be turned on, and keeps at least one of the N modular machines in a shutdown state, and then The opening temperature is controlled according to the inlet temperature change rate ΔT3a of each air conditioner heat exchanger corresponding to any modular machine that is turned on and the inlet temperature change rate ΔT3b of each air conditioner heat exchanger corresponding to any modular machine in the shutdown state. Any modular machine and any module in the shutdown state The block machine alternately performs heating operation, and keeps the fan in any of the opened modular machines and the fan in any of the modular machines in the stopped state continuously, thereby performing defrosting by forced convection heat transfer of the fan, thereby eliminating conversion to The cooling operation and the stop fan are used for defrosting, reducing the heating attenuation during the heating and defrosting, greatly improving the heating effect of the air-cooled heat pump chiller and hot water unit, and improving the user experience.

According to an embodiment of the present invention, when the air-cooled heat pump cold and hot water unit enters a defrosting mode, wherein the outdoor air temperature T4 is greater than the first preset temperature, the air-cooled heat pump is controlled to be hot and cold The unit operates in a rotating defrosting mode; if the outdoor ambient temperature T4 is less than or equal to the first preset temperature, the air-cooled heat pump hot and cold water unit is controlled to operate in a conventional defrosting mode.

According to an embodiment of the present invention, when any of the module machines that are turned on are the main module machine, and any of the module machines that are in the shutdown state is the first slave module machine, each of the corresponding module machines according to the opening The inlet temperature change rate ΔT3a of the air conditioner heat exchanger and the inlet temperature change rate ΔT3b of each air conditioner heat exchanger corresponding to any module machine in the stop state control any one of the module machines that are turned on and any one of the shutdown states The module machine alternate heating operation specifically includes: a2, controlling the compressor in the main module machine to be powered on to enable the main module mechanism to operate hot, and acquiring the accumulation of the main module machine after the main module mechanism is hot running Frosting time; b2, when the cumulative frosting time of the main modular machine reaches a third time threshold or the inlet temperature change rate ΔT3a of any one of the main module machines is greater than or equal to the first preset value Controlling the compressor in the main module machine to stop, the fan in the main module machine continues to operate, and controlling the compressor in the first slave module machine to be powered on to enable the first slave module mechanism to operate hot. Take Obtaining a cumulative frosting time of the first slave module machine after the first slave module mechanism is hot running; c2, when the cumulative frosting time of the first slave module machine reaches a fourth time threshold or the first Controlling the compressor in the first slave module machine to stop when the inlet temperature change rate ΔT3b of any one of the module air conditioners is greater than or equal to the first preset value, the first slave module machine The fan in the middle continues to run and returns to step a2.

According to an embodiment of the present invention, the inlet temperature change rate ΔT3a of each of the air conditioner heat exchangers corresponding to any of the modular machines that are turned on and each of the air conditioner heat exchangers corresponding to any of the modular machines in the shutdown state are The inlet temperature change rate ΔT3b controls the alternate heating operation of any of the module machines that are turned on and any module machine that is in the shutdown state, and further includes: when the cumulative frosting time of the main module machine does not reach the third time threshold And when the inlet temperature change rate ΔT3a of each of the air conditioner heat exchangers in the main module machine is less than the first preset value, the main module machine is controlled to continue the heating operation.

According to an embodiment of the present invention, the inlet temperature change rate ΔT3a of each of the air conditioner heat exchangers corresponding to any of the modular machines that are turned on and each of the air conditioner heat exchangers corresponding to any of the modular machines in the shutdown state are The inlet temperature change rate ΔT3b controls the alternate heating operation of any of the module machines that are turned on and the module machine that is in the shutdown state, and further includes: when the cumulative frosting time of the first slave module machine does not reach the fourth The first slave module machine is controlled to continue the heating operation when the time threshold is exceeded and the inlet temperature change rate ΔT3b of each of the first air conditioners in the first slave module machine is less than the first preset value.

In order to achieve the above object, an air-cooled heat pump cold and hot water unit according to another embodiment of the present invention includes: N modular machines, and outlet pipes of each of the modular machines are respectively connected to the air-cooled heat pump to be cooled. a total outlet pipe of the hot water unit, wherein each inlet pipe of the modular machine is respectively connected to a total inlet pipe of the air-cooled heat pump cold water unit, so that the N module machines are connected in parallel, wherein each The modular machine includes a plurality of hot water heating systems, each of the hot water heating systems includes a compressor and an air conditioning heat exchanger, N is an integer greater than or equal to 2; and the first temperature detecting module is configured to detect an outdoor ambient temperature in real time. a fourth temperature detecting module, configured to detect an inlet temperature T3 of each of the air conditioner heat exchangers in each of the modular machines in real time; and a control module configured to obtain an inlet temperature T3 of each of the air conditioner heat exchangers detected in real time The inlet temperature change rate of each air conditioner heat exchanger is ΔT3, and when the air-cooling heat pump hot and cold water unit enters the defrosting mode, it is determined whether to control the air-cooled heat pump cold and hot water unit according to the outdoor ambient temperature T4. Rotational defrosting Operation, wherein if the air-cooled heat pump cold and hot water unit is operated in a rotating defrosting mode, the control module controls at least one of the N modular machines to be turned on, and maintains the N modular machines At least one of the modular machines is in a shutdown state, and an inlet temperature change rate ΔT3a of each of the air conditioner heat exchangers corresponding to any of the open modular machines and each of the air conditioner heat exchangers corresponding to any of the modular machines in the stopped state The inlet temperature change rate ΔT3b controls any module machine that is turned on to alternately heat operation with any module machine in the shutdown state, and maintains the fan in any of the open module machines and any module machine in the shutdown state. The fan is continuously operated to defrost by forced convection heat transfer from the fan.

According to the air-cooled heat pump water chiller unit according to the embodiment of the present invention, when operating in the rotation defrosting mode, the control module controls at least one of the N modular machines to be turned on, and maintains at least one of the N modular machines In the shutdown state, then according to the inlet temperature change rate ΔT3a of each air conditioner heat exchanger corresponding to any modular machine that is turned on, and the inlet temperature change rate of each air conditioner heat exchanger corresponding to any modular machine in the shutdown state △ T3b controls any module machine that is turned on to alternately operate with any module machine in the shutdown state, and keeps the fan in any module machine that is turned on and the fan in any module machine that is in the shutdown state continue to run. Defrost by forced convection heat transfer by the fan, that is, through the switching between the modular machines, the defrosting is performed by the continuous operation of the fan itself, thereby eliminating the need for defrosting by converting the cooling operation and stopping the fan, and reducing the heating The heating decay in the frost greatly improves the heating effect and improves the user experience.

According to an embodiment of the present invention, when the air-cooled heat pump cold and hot water unit enters a defrosting mode, wherein the control module controls the air cooling if the outdoor ambient temperature T4 is greater than a first preset temperature The heat pump hot and cold water unit operates in a rotating defrosting mode; if the outdoor ambient temperature T4 is less than or equal to the first preset temperature, the control module controls the air-cooled heat pump cold and hot water unit to perform conventional defrosting mode run.

According to an embodiment of the present invention, when any of the module machines that are turned on is the main module machine, and any of the module machines that are in the shutdown state is the first slave module machine, the control module controls the main control by the following control flow. The module machine and the first slave module machine alternately perform heating operation: a2, controlling a compressor in the main module machine to be powered on to enable the main module mechanism to operate thermally, and acquiring the hot after the main module mechanism is hot running The cumulative frosting time of the main modular machine; b2, when the cumulative frosting time of the main modular machine reaches a third time threshold or the inlet temperature of any air conditioning heat exchanger in the main modular machine When the rate of change ΔT3a is greater than or equal to the first preset value, the compressor in the main module machine is controlled to stop, the fan in the main module machine continues to operate, and the compressor in the first slave module machine is controlled to be turned on. Causing the first slave module mechanism to operate thermally, and acquiring a cumulative frosting time of the first slave module machine after the first slave module mechanism is hot running; c2, when the first slave module machine is accumulated Controlling the first slave module machine when the frosting time reaches the fourth time threshold or the inlet temperature change rate ΔT3b of any one of the first slave module machines is greater than or equal to the first preset value The compressor is stopped, the fan in the first slave module machine continues to run, and returns to step a2.

According to an embodiment of the present invention, when the cumulative frosting time of the main modular machine does not reach the third time threshold and the inlet temperature change rate ΔT3a of each of the air conditioning heat exchangers in the main modular machine is smaller than When the first preset value is described, the control module controls the main module machine to continue the heating operation.

According to an embodiment of the present invention, when the accumulated frosting time of the first slave module machine does not reach the fourth time threshold and the inlet temperature change rate of each air conditioner heat exchanger in the first slave module machine is Δ When the T3b is smaller than the first preset value, the control module controls the first slave module machine to continue the heating operation.

In order to achieve the above object, an embodiment of the present invention provides a defrosting control method for an air-cooled heat pump cold and hot water unit, wherein the air-cooled heat pump hot and cold water unit includes N modular machines, and N is greater than or equal to 2 An integral number, the outlet pipes of each of the modular machines are respectively connected to the total outlet pipes of the air-cooled heat pump cold and hot water unit, and the inlet pipes of each of the modular machines are respectively connected to the air-cooled heat pump a total inlet pipe of the water unit to realize parallel connection of the N modular machines, each of the modular machines comprising a plurality of hot water systems, each of the hot water systems including a compressor and an air conditioner heat exchanger The defrosting control method includes the following steps: detecting the outdoor ambient temperature T4 in real time, and detecting the low pressure side pressure of each compressor in each of the modular machines in real time; acquiring each according to the low pressure side pressure of each compressor detected in real time. a pressure change rate ΔP of the low pressure side of the compressor; when the air-cooling heat pump hot and cold water unit enters a defrosting mode, determining the outdoor ambient temperature T4; if the outdoor ambient temperature T4 is greater than the first preset temperature , Controlling the rate of change △ P air to water heat pump according to the low-pressure side pressure of each compressor run in rotation defrosting mode.

According to an embodiment of the present invention, when the air-cooled heat pump cold and hot water unit is operated in a rolling defrosting mode, wherein at least one of the N modular machines is controlled to be turned on, and the N modules are maintained At least one modular machine in the machine is in a stop state; and a low pressure side pressure change rate ΔPa of each compressor corresponding to any of the open modular machines and a low pressure of each compressor corresponding to any of the modular machines in the stopped state The side pressure change rate ΔPb controls any module machine that is turned on to alternately heat the operation with any module machine in the stop state, and maintains the fan in any of the open modules and any module machine in the stop state. The fan is continuously operated to defrost by forced convection heat transfer from the fan.

The defrosting control method of the air-cooled heat pump water chiller according to the embodiment of the present invention detects the outdoor ambient temperature T4 in real time, and detects the low pressure side pressure of each compressor in each modular machine in real time, and then passes the real-time detection outdoor environment. When the temperature T4 determines that the air-cooling heat pump cold and hot water unit is operating in the rotating defrosting mode, at least one of the N modular machines is controlled to be turned on, and at least one of the N modular machines is kept in a shutdown state, and then according to the opening Any module pair The low pressure side pressure change rate ΔPa of each compressor and the low pressure side pressure change rate ΔPb of each compressor corresponding to any modular machine in the stop state control any one of the open modular machines and the shutdown state Any modular machine alternately performs heating operation, and keeps the fan in any of the module machines that are turned on and the fan in any of the module machines in the stopped state continue to operate, thereby performing defrosting by forced convection heat transfer of the fan, thereby eliminating It is converted into a cooling operation and a fan stop for defrosting, reducing the heating attenuation during heating and defrosting, greatly improving the heating effect of the air-cooled heat pump chiller and hot water unit, and improving the user experience.

According to an embodiment of the present invention, the defrosting control method of the air-cooled heat pump water chiller unit further includes: if the outdoor environment temperature T4 is less than or equal to the first preset temperature, controlling the air cooling The heat pump water chiller unit operates in a conventional defrosting mode.

According to an embodiment of the present invention, when any of the module machines that are turned on are the main module machine, and any of the module machines that are in the shutdown state is the first slave module machine, each of the corresponding module machines according to the opening The pressure change rate ΔPa of the low pressure side of the compressor and the pressure change rate ΔPb of the low pressure side of each compressor corresponding to any modular machine in the stop state control any modular machine that is turned on and any modular machine that is in the stop state The alternating heating operation specifically includes: a3, controlling the compressor in the main module machine to be turned on to enable the main module mechanism to operate hot, and acquiring the cumulative frost of the main module machine after the main module mechanism is hot running a time; b3, when the cumulative frosting time of the main modular machine reaches a fifth time threshold or the low pressure side pressure change rate ΔPa of any of the main modular machines is greater than or equal to a second preset value, the control station Stopping the compressor in the main modular machine, the fan in the main modular machine continues to operate, and controlling the compressor in the first slave module machine to be powered on to enable the first slave module mechanism to operate thermally, and Description Obtaining a cumulative frosting time of the first slave module machine after the first slave module mechanism is hot running; c3, when the accumulated frosting time of the first slave module machine reaches a sixth time threshold or the first slave module machine Controlling the compressor in the first slave module machine to stop when the low pressure side pressure change rate ΔPb of any of the compressors is greater than or equal to the second preset value, the fan in the first slave module machine continues to operate And return to step a3.

According to an embodiment of the present invention, the low-pressure side pressure change rate ΔPa of each compressor corresponding to any of the modular machines that are turned on and the low-pressure side pressure of each compressor corresponding to any of the modular machines in the stopped state The change rate ΔPb controls any of the modular machines that are turned on and the alternate heating operation of any of the modular machines that are in the shutdown state, and further includes: when the cumulative frosting time of the main modular machine does not reach the fifth time threshold When the low pressure side pressure change rate ΔPa of each compressor in the main module machine is less than the second preset value, the main module machine is controlled to continue the heating operation.

According to an embodiment of the present invention, the low-pressure side pressure change rate ΔPa of each compressor corresponding to any of the modular machines that are turned on and the low-pressure side pressure of each compressor corresponding to any of the modular machines in the stopped state The rate of change ΔPb controls any of the modular machines that are turned on and the alternate heating operation of any of the modular machines that are in the shutdown state, and further includes: when the cumulative frosting time of the first slave module machine does not reach the sixth time threshold And when the low-pressure side pressure change rate ΔPb of each compressor in the first slave module machine is less than the second preset value, the first slave module machine is controlled to continue the heating operation.

In order to achieve the above object, an air-cooled heat pump water chiller unit according to another embodiment of the present invention includes: N a modular machine, the outlet pipes of each of the modular machines are respectively connected to the total outlet pipes of the air-cooled heat pump cold and hot water units, and the inlet pipes of each of the modular machines are respectively connected to the air-cooled heat pump a total inlet pipe of the hot water unit to realize parallel connection of the N modular machines, wherein each of the modular machines includes a plurality of hot water systems, each of which comprises a compressor and an air conditioner N is an integer greater than or equal to 2; a first temperature detecting module for detecting the outdoor ambient temperature T4 in real time; and a first pressure detecting module for detecting the low pressure side pressure of each compressor in each of the modular machines in real time a control module for obtaining a low-pressure side pressure change rate ΔP of each compressor according to a low-pressure side pressure of each compressor detected in real time, and when the air-cooled heat pump hot and cold water unit enters a defrost mode The outdoor ambient temperature T4 is determined, wherein if the outdoor ambient temperature T4 is greater than the first preset temperature, the control module controls the air-cooled heat pump to be hot and cold according to the low-pressure side pressure change rate ΔP of each compressor. waterplane Run in rotation defrost mode.

According to an embodiment of the present invention, when the air-cooled heat pump cold and hot water unit is operated in a rolling defrosting mode, the control module controls at least one of the N modular machines to be turned on, and maintains the N At least one of the modular machines is in a stop state, and each of the compressors corresponding to the low pressure side pressure change rate ΔPa of each compressor corresponding to any of the open modular machines and each of the modular machines in the stopped state The low-pressure side pressure change rate ΔPb controls any module machine that is turned on to alternately heat operation with any module machine in the shutdown state, and maintains the fan in any of the open modular machines and any module in the shutdown state. The fan in the machine continues to operate to defrost by forced convection heat transfer from the fan.

According to the air-cooled heat pump water chiller unit according to the embodiment of the present invention, when operating in the rotation defrosting mode, the control module controls at least one of the N modular machines to be turned on, and maintains at least one of the N modular machines It is in the stop state, and then according to the low pressure side pressure change rate ΔPa of each compressor corresponding to any modular machine that is turned on, and the low pressure side pressure change rate ΔPb of each compressor corresponding to any modular machine in the stop state. Any one of the module machines that are turned on alternates with the heating of any module machine in the shutdown state, and keeps the fan in any of the module machines that are turned on and the fan in any module machine that is in the shutdown state continuously run to pass The forced convection heat transfer of the fan is defrosted, that is, by switching between the modular machines, the defrosting is performed by the continuous operation of the fan itself, thereby eliminating defrosting by converting the cooling operation and stopping the fan, and reducing the heating defrosting time. The heating attenuation greatly improves the heating effect and improves the user experience.

According to an embodiment of the present invention, when the air-cooled heat pump hot and cold water unit enters a defrost mode, if the outdoor ambient temperature T4 is less than or equal to the first preset temperature, the control module controls the The air-cooled heat pump water chiller unit operates in a conventional defrosting mode.

According to an embodiment of the present invention, when any of the module machines that are turned on is the main module machine, and any of the module machines that are in the shutdown state is the first slave module machine, the control module controls the main control by the following control flow. The module machine and the first slave module machine alternately perform heating operation: a3, controlling the compressor in the main module machine to be powered on to enable the main module mechanism to operate hot, and acquiring the hot after the main module mechanism is hot running The cumulative frosting time of the main modular machine; b3, when the cumulative frosting time of the main modular machine reaches a fifth time threshold or the low pressure side pressure of any compressor in the main modular machine When the rate ΔPa is greater than or equal to the second preset value, the compressor in the main module machine is controlled to stop, the fan in the main module machine continues to operate, and the compressor in the first slave module machine is controlled to be turned on. Causing the first slave module mechanism to operate thermally, and acquiring a cumulative frosting time of the first slave module machine after the first slave module mechanism is hot running; c3, when the first slave module machine is accumulated Controlling the first slave module machine when the frosting time reaches a sixth time threshold or the low pressure side pressure change rate ΔPb of any of the first slave module machines is greater than or equal to the second preset value When the compressor is stopped, the fan in the first slave module machine continues to run and returns to step a3.

According to an embodiment of the present invention, when the cumulative frosting time of the main modular machine does not reach the fifth time threshold and the low pressure side pressure change rate ΔPa of each compressor in the main modular machine is smaller than the The second preset value controls the main module machine to continue the heating operation.

According to an embodiment of the present invention, when the cumulative frosting time of the first slave module machine does not reach the sixth time threshold and the low pressure side pressure change rate ΔPb of each compressor in the first slave module machine When both are less than the second preset value, the control module controls the first slave module machine to continue the heating operation.

In order to achieve the above object, an embodiment of the present invention provides a defrosting control method for an air-cooled heat pump cold and hot water unit, wherein the air-cooled heat pump hot and cold water unit includes N modular machines, and N is greater than or equal to 2 An integral number, the outlet pipes of each of the modular machines are respectively connected to the total outlet pipes of the air-cooled heat pump cold and hot water unit, and the inlet pipes of each of the modular machines are respectively connected to the air-cooled heat pump The total inlet pipe of the water unit is configured to realize parallel connection of the N module machines, and the defrosting control method comprises the following steps: detecting the outdoor ambient temperature T4 in real time, and detecting the temperature of the inlet water corresponding to each of the module machines in real time. The effluent water temperature; obtaining the temperature difference between the inlet and outlet water of each of the modular machines according to the influent water temperature and the effluent water temperature detected in real time; when the air-cooling heat pump cold and hot water unit enters the defrosting mode, determining the outdoor ambient temperature T4 If the outdoor ambient temperature T4 is greater than the first preset temperature, the air-cooled heat pump cold and hot water unit is controlled to operate in a rotating defrosting mode according to the temperature difference between the inlet and outlet water.

According to an embodiment of the present invention, when the air-cooled heat pump cold and hot water unit is operated in a rolling defrosting mode, wherein at least one of the N modular machines is controlled to be turned on, and the N modules are maintained At least one module machine in the machine is in a stop state; and according to the temperature difference between the inlet and outlet water corresponding to any module machine that is turned on and the temperature difference between the inlet and outlet water corresponding to any module machine in the shutdown state, any module machine that is turned on is controlled to be in a shutdown state. Any module machine alternately performs heating operation, and keeps the fan in any of the module machines that are turned on and the fan in any module machine that is in the shutdown state continue to operate, thereby performing defrosting by forced convection heat transfer of the fan.

According to the defrosting control method of the air-cooled heat pump water chiller unit according to the embodiment of the invention, the outdoor environment temperature T4 is detected in real time, and the inlet water temperature and the effluent water temperature corresponding to each module machine are detected in real time to obtain the inlet and outlet water of each module machine. The temperature difference is then determined by the outdoor ambient temperature T4 detected in real time, when the air-cooled heat pump hot and cold water unit is operated in the rotation defrosting mode, at least one of the N modular machines is controlled to be turned on, and at least one of the N modular machines is maintained. The module machine is in the stop state, and then according to the temperature difference between the inlet and outlet water corresponding to any module machine that is turned on, and the corresponding inlet and outlet water of any modular machine in the shutdown state The temperature difference control controls any of the open modular machines to alternately operate with any of the modular machines in the stopped state, and maintains the fan in any of the open modular machines and the fan in any of the modular machines in the stopped state to continue to operate. Defrost by forced convection heat transfer of the fan, so that it does not need to be converted into a cooling operation and a fan stop for defrosting, reducing the heating attenuation during heating and defrosting, and greatly improving the heating effect of the air-cooled heat pump water chiller unit To improve the user experience.

According to an embodiment of the present invention, the defrosting control method of the air-cooled heat pump water chiller unit further includes: if the outdoor environment temperature T4 is less than or equal to the first preset temperature, controlling the air cooling The heat pump water chiller unit operates in a conventional defrosting mode.

According to an embodiment of the present invention, when any one of the module machines that are turned on is the main module machine, and any of the module machines that are in the shutdown state is the first slave module machine, the inlet and outlet water corresponding to any module machine that is turned on is The difference between the temperature difference and the temperature difference between the inlet and outlet water of any modular machine in the shutdown state controls the alternate heating operation of any module machine that is turned on and any module machine that is in the shutdown state, and specifically includes: a4, controlling compression in the main module machine Turning on the machine to enable the main module mechanism to run hot, and obtaining the temperature difference between the inlet and outlet water of the main module machine after the fifth preset time of the main module mechanism is hot, and obtaining the initial temperature difference between the first inlet and outlet water, and acquiring the main The cumulative frosting time of the module machine; b4, when the cumulative frosting time of the main module machine reaches the seventh time threshold or the temperature difference between the inlet and outlet of the main module machine is less than the first preset temperature difference, the main module machine is controlled The compressor in the main machine is stopped, and the fan in the main module machine continues to operate, and the compressor in the first slave module machine is controlled to be turned on to enable the first slave module mechanism to operate thermally, wherein The first preset temperature difference is calculated according to the initial temperature difference of the first inlet and outlet water; c4, the temperature difference between the inlet and outlet water of the first slave module machine is obtained after the first slave module mechanism is thermally operated for the fifth preset time a second temperature difference between the first inlet and outlet water, and a cumulative frosting time of the first slave module machine; d4, when the cumulative frosting time of the first slave module machine reaches an eighth time threshold or the first slave module machine When the temperature difference between the inlet and outlet water is less than the second preset temperature difference, the compressor in the first slave module machine is controlled to stop, the fan of the first slave module machine continues to run, and returns to step a4, wherein the second The preset temperature difference is calculated according to the initial temperature difference of the second inlet and outlet water.

According to an embodiment of the present invention, the temperature difference between the inlet and outlet water corresponding to any module machine that is turned on and the temperature difference between the inlet and outlet water corresponding to any module machine in the shutdown state control any module machine that is turned on and is in a shutdown state. The heating operation of the module module further includes: when the accumulated frosting time of the main module machine does not reach the seventh time threshold and the temperature difference between the inlet and outlet of the main module machine is greater than or equal to the first preset temperature difference And controlling the main modular machine to continue heating operation.

According to an embodiment of the present invention, the temperature difference between the inlet and outlet water corresponding to any module machine that is turned on and the temperature difference between the inlet and outlet water corresponding to any module machine in the shutdown state control any module machine that is turned on and is in a shutdown state. The module heating operation of the module further includes: when the accumulated frosting time of the first slave module machine does not reach the eighth time threshold, and the temperature difference between the inlet and outlet of the first slave module machine is greater than or equal to the second When the temperature difference is preset, the first slave module machine is controlled to continue the heating operation.

In order to achieve the above object, an air-cooled heat pump cold and hot water unit according to another embodiment of the present invention includes: N modular machines, and outlet pipes of each of the modular machines are respectively connected to the air-cooled heat pump to be cooled. a total outlet pipe of the hot water unit, wherein each inlet pipe of the modular machine is respectively connected to a total inlet pipe of the air-cooled heat pump hot and cold water unit, so that the N modular machines are connected in parallel, wherein N is An integer greater than or equal to 2; a first temperature detecting module for detecting an outdoor ambient temperature T4 in real time; a second temperature detecting module for detecting an influent water temperature corresponding to each of the modular devices in real time; and a third temperature detecting module Detecting the effluent water temperature corresponding to each of the modular machines in real time; the control module is configured to obtain the temperature difference between the inlet and outlet water of each of the modular machines according to the influent water temperature and the effluent water temperature detected in real time, and in the air-cooled heat pump The outdoor environment temperature T4 is determined when the water unit enters the defrosting mode, wherein if the outdoor ambient temperature T4 is greater than the first preset temperature, the control module controls according to the temperature difference between the inlet and outlet water The air-cooled heat pump cold and hot water unit operates in a rotating defrosting mode.

According to an embodiment of the present invention, when the air-cooled heat pump cold and hot water unit is operated in a rolling defrosting mode, the control module controls at least one of the N modular machines to be turned on, and maintains the N At least one of the module machines is in a shutdown state, and according to the temperature difference between the inlet and outlet water corresponding to any module machine that is turned on, and the temperature difference between the inlet and outlet water corresponding to any module machine in the shutdown state, any modular machine that is turned on is controlled and Any modular machine in the shutdown state alternates heating operation, and keeps the fan in any module machine that is turned on and the fan in any module machine in the shutdown state continue to operate to defoam by forced convection heat transfer of the fan. .

According to the air-cooled heat pump water chiller unit according to the embodiment of the present invention, when operating in the rotation defrosting mode, the control module controls at least one of the N modular machines to be turned on, and maintains at least one of the N modular machines In the stop state, then according to the temperature difference between the inlet and outlet water corresponding to any module machine that is turned on and the temperature difference between the inlet and outlet water corresponding to any module machine in the shutdown state, any module machine that is turned on is alternated with any module machine in the shutdown state. Run hot, and keep the fan in any module machine that is turned on and the fan in any module machine in the stop state continue to run, to defoam through the forced convection heat transfer of the fan, that is, through the switch between the module machines The defrosting is carried out by using the continuous operation of the fan itself, thereby eliminating defrosting by converting the cooling operation and stopping the fan, reducing the heating attenuation during the heating and defrosting, greatly improving the heating effect and improving the user experience.

According to an embodiment of the present invention, when the air-cooled heat pump hot and cold water unit enters a defrost mode, if the outdoor ambient temperature T4 is less than or equal to the first preset temperature, the control module controls the The air-cooled heat pump water chiller unit operates in a conventional defrosting mode.

According to an embodiment of the present invention, when any of the module machines that are turned on is the main module machine, and any of the module machines that are in the shutdown state is the first slave module machine, the control module controls the main control by the following control flow. The module machine and the first slave module machine alternately perform heating operation: a4, controlling the compressor in the main module machine to be turned on to enable the main module mechanism to operate hot, and the fifth operation is performed in the main module mechanism After the time is set, the temperature difference between the inlet and outlet water of the main module machine is obtained as the initial temperature difference between the first inlet and outlet water, and the cumulative frosting time of the main module machine is acquired; b4, when the main module machine is accumulated When the frosting time reaches the seventh time threshold or the temperature difference between the inlet and outlet water of the main module machine is less than the first preset temperature difference, the compressor in the main module machine is controlled to stop, and the fan in the main module machine continues to run, and Controlling the compressor in the first slave module machine to be powered on to cause the first slave module mechanism to operate hot, wherein the first preset temperature difference is calculated according to the initial temperature difference of the first inlet and outlet water; c4, in the Acquiring the temperature difference between the inlet and outlet water of the first slave module machine after the fifth slave module mechanism is thermally operated for the second inlet and outlet water, and acquiring the cumulative frosting time of the first slave module machine D4, when the accumulated frosting time of the first slave module machine reaches an eighth time threshold or the temperature difference between the inlet and outlet of the first slave module machine is less than a second preset temperature difference, controlling the first slave module machine The compressor is stopped, the fan of the first slave module machine continues to run, and returns to step a4, wherein the second preset temperature difference is calculated according to the initial temperature difference of the second inlet and outlet water.

According to an embodiment of the present invention, when the accumulated frosting time of the main module machine does not reach the seventh time threshold and the temperature difference between the inlet and outlet water of the main module machine is greater than or equal to the first preset temperature difference, The control module controls the main module machine to continue the heating operation.

According to an embodiment of the present invention, when the accumulated frosting time of the first slave module machine does not reach the eighth time threshold and the temperature difference between the inlet and outlet of the first slave module machine is greater than or equal to the second preset temperature difference The control module controls the first slave module machine to continue the heating operation.

An air-cooled heat pump cold and hot water unit according to an embodiment of the present invention further includes: N modular machines, wherein outlet pipes of each of the modular machines are respectively connected to a total outlet pipe of the air-cooled heat pump cold and hot water unit The inlet pipes of each of the modular machines are respectively connected to the total inlet pipes of the air-cooled heat pump water chiller unit to realize parallel connection of the N module machines, wherein N is an integer greater than or equal to 2; a temperature detecting module for detecting an outdoor ambient temperature T4 in real time; an obtaining module for acquiring operating parameters of each of the modular machines; and a control module for when the air-cooling heat pump hot and cold water unit enters a defrost mode Determining whether to control the air-cooled heat pump cold and hot water unit to operate in a rotating defrosting mode according to the outdoor ambient temperature T4, wherein the control module controls if the air-cooled heat pump cold and hot water unit operates in a rotating defrosting mode At least one of the N modular machines is turned on, and at least one of the N modular machines is kept in a shutdown state, and any modular machine that is turned on according to the outdoor ambient temperature T4 The operating parameter controls whether any of the module machines that are turned on alternates with the heating operation of any of the module machines in the stopped state, and keeps the fan in any of the module machines that are turned on and the fan in any module machine that is in the stopped state continue to operate. To defrost by forced convection heat transfer by a fan.

According to the air-cooled heat pump water chiller unit according to the embodiment of the present invention, when operating in the rotation defrosting mode, the control module controls at least one of the N modular machines to be turned on, and maintains at least one of the N modular machines In the stop state, then according to the outdoor ambient temperature T4 and the operating parameters of any module machine that is turned on, any one of the module machines that are turned on is alternately heated with any module machine in the stopped state, and any module that is turned on is maintained. The fan in the machine and the fan in any modular machine in the stop state continue to operate to defoam by forced convection heat transfer of the fan, that is, through the switching between the module machines, the defrosting is performed by using the continuous operation of the fan itself. , so that there is no need to change the cooling operation and stop the wind The machine is used for defrosting, reducing the heating decay during heating and defrosting, greatly improving the heating effect and improving the user experience.

The operating parameters of each of the modular machines may include an influent water temperature Tin corresponding to each of the modular machines, an outlet water temperature Tout corresponding to each of the modular machines, and an air conditioning heat exchange in each of the modular machines. The inlet temperature T3 of the device, the low pressure side pressure of each compressor in each of the modular machines.

DRAWINGS

1 is a block diagram showing an air-cooled heat pump water chiller unit according to an embodiment of the present invention;

2 is a schematic structural diagram of a system of a module machine according to an embodiment of the present invention;

3A is a flow chart of a defrosting control method for an air-cooled heat pump water chiller unit according to a first embodiment of the present invention;

3B is a flow chart of a defrosting control method for an air-cooled heat pump water chiller unit according to a second embodiment of the present invention;

3C is a flow chart of a defrosting control method for an air-cooled heat pump water chiller unit according to a third embodiment of the present invention;

3D is a flow chart of a defrosting control method for an air-cooled heat pump water chiller unit according to a fourth embodiment of the present invention;

4A is a flow chart showing a defrosting control when the air-cooled heat pump cold and hot water unit is operated in a rotating defrosting mode according to the first embodiment of the present invention;

4B is a flow chart showing the defrosting control when the air-cooled heat pump water chiller unit is operated in the rotation defrosting mode according to the second embodiment of the present invention;

4C is a flow chart showing the defrosting control when the air-cooled heat pump water chiller unit is operated in the rotation defrosting mode according to the third embodiment of the present invention;

4D is a flow chart showing the defrosting control of the air-cooled heat pump water chiller unit in the rotation defrosting mode according to the fourth embodiment of the present invention.

detailed description

The embodiments of the present invention are described in detail below, and the examples of the embodiments are illustrated in the drawings, wherein the same or similar reference numerals are used to refer to the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the drawings are intended to be illustrative of the invention and are not to be construed as limiting.

Hereinafter, a defrosting control method for an air-cooled heat pump water chiller unit and an air-cooling heat pump chiller unit according to an embodiment of the present invention will be described with reference to the accompanying drawings.

1 and 2, an air-cooled heat pump hot and cold water unit according to an embodiment of the present invention includes N modular machines, N is an integer greater than or equal to 2, and the outlet pipes of each modular machine are respectively connected to air cooling. The total outlet pipes of the heat pump hot and cold water units, the inlet pipes of each modular machine are respectively connected to the total inlet pipes of the air-cooled heat pump cold and hot water units, so as to realize the parallel connection of the N modular machines. And, as shown in FIG. 2, each modular machine may include a plurality of hot water heating systems such as two (a first hot water system and a second hot water system), each of which includes a compressor and an air conditioner. Heat exchanger, where each system The air conditioning heat exchanger in the hot water system, for example, the air conditioning heat exchanger in the first hot water system and the air conditioning heat exchanger in the second hot water system share one fan and share the same water side heat exchanger.

That is to say, each air-cooled heat pump cold and hot water machine can form an independent modular machine, each modular machine shares the same main waterway, and the air-cooled heat pump cold and hot water unit composed of N modular machines provides cold heat to the internal machine. .

The defrosting control method of the air-cooled heat pump cold and hot water machine of the embodiment of the invention comprises the following steps:

S10, detecting the outdoor ambient temperature T4 in real time, and obtaining the operating parameters of each modular machine.

Among them, the outdoor temperature T4 can be detected by the outdoor temperature sensor.

According to an embodiment of the present invention, the operating parameters of each modular machine may include a water inlet temperature Tin corresponding to each modular machine, an outlet water temperature Tout corresponding to each modular machine, and an air conditioning heat exchanger of each modular machine. The inlet temperature T3, the low pressure side pressure of each compressor in each modular machine.

S20, when the air-cooled heat pump cold and hot water unit enters the defrosting mode, it is determined according to the outdoor environmental temperature T4 whether to control the air-cooled heat pump hot and cold water unit to operate in a rotating defrosting mode.

According to an embodiment of the present invention, when the air-cooled heat pump cold and hot water unit enters the defrosting mode, wherein if the outdoor ambient temperature T4 is greater than the first preset temperature, the air-cooled heat pump hot and cold water unit is controlled to rotate the defrosting mode. Running; if the outdoor ambient temperature T4 is less than or equal to the first preset temperature, then the air-cooled heat pump hot and cold water unit is controlled to operate in a conventional defrosting mode.

Among them, it should be noted that the first preset temperature can be calibrated according to the specific conditions of the air-cooled heat pump hot and cold water unit. Moreover, the conventional defrosting method refers to the chilling of the air-cooled heat pump hot and cold water unit or the normal cooling operation and the stopping fan. That is to say, when the outdoor ambient temperature T4 is relatively low, the air-cooled heat pump hot and cold water unit still passes the normal state. Cooling operation and fan stop for defrosting. The air-cooled heat pump water chiller unit operates in a rotating defrosting mode, that is, a defrosting between the module machines, only for a specific outdoor ambient temperature.

S30. If the air-cooled heat pump hot and cold water unit operates in a rotating defrosting mode, at least one of the N modular machines is controlled to be turned on, and at least one of the N modular machines is kept in a shutdown state.

S40, according to the outdoor ambient temperature T4 and the inlet water temperature Tin of any modular machine that is turned on, control any one of the open modular machines and any modular machine in the stopped state to perform heating operation alternately, and maintain any modular machine that is turned on. The fan in the middle is continuously operated with the fan in any of the modular machines in the shutdown state to defrost by forced convection heat transfer of the fan.

According to the defrosting control method of the air-cooled heat pump water chiller unit according to the embodiment of the present invention, when the air-cooling heat pump cold and hot water unit is operated in the rotation defrosting mode by the outdoor environment temperature T4 detected in real time, the N module machines are controlled. At least one module machine is turned on, and at least one of the N modular machines is kept in a shutdown state, and then any module that is turned on is controlled according to the outdoor ambient temperature T4 and the inlet water temperature Tin of any of the opened modular machines. Any modular machine in the shutdown state alternates heating operation, and keeps the fan in any module machine that is turned on and the fan in any module machine in the shutdown state continue to operate to defoam by forced convection heat transfer of the fan. , so there is no need to convert to cooling operation and stop the wind The machine is used for defrosting, reducing the heating attenuation during heating and defrosting, greatly improving the heating effect of the air-cooled heat pump chiller and hot water unit, and improving the user experience.

According to the first embodiment of the present invention, when the operating parameters of each modular machine include the influent water temperature Tin corresponding to each modular machine, as shown in FIG. 3A, the defrosting control method of the air-cooled heat pump cold and hot water unit includes The following steps:

S1, real-time detection of the outdoor ambient temperature T4 and the influent water temperature Tin corresponding to each modular machine.

Wherein, the outdoor ambient temperature T4 can be detected by the outdoor temperature sensor, and the inlet water temperature Tin of the corresponding modular machine can be detected by a temperature sensor disposed at the inlet pipe of each modular machine.

S2, when the air-cooled heat pump cold and hot water unit enters the defrosting mode, it is determined according to the outdoor environmental temperature T4 whether to control the air-cooled heat pump hot and cold water unit to operate in a rotating defrosting mode.

According to an embodiment of the present invention, when the air-cooled heat pump cold and hot water unit enters the defrosting mode, wherein if the outdoor ambient temperature T4 is greater than the first preset temperature, the air-cooled heat pump hot and cold water unit is controlled to rotate the defrosting mode. Running; if the outdoor ambient temperature T4 is less than or equal to the first preset temperature, then the air-cooled heat pump hot and cold water unit is controlled to operate in a conventional defrosting mode.

Among them, it should be noted that the first preset temperature can be calibrated according to the specific conditions of the air-cooled heat pump hot and cold water unit. Moreover, the conventional defrosting method refers to the chilling of the air-cooled heat pump hot and cold water unit or the normal cooling operation and the stopping fan. That is to say, when the outdoor ambient temperature T4 is relatively low, the air-cooled heat pump hot and cold water unit still passes the normal state. Cooling operation and fan stop for defrosting. The air-cooled heat pump water chiller unit operates in a rotating defrosting mode, that is, a defrosting between the module machines, only for a specific outdoor ambient temperature.

S3. If the air-cooled heat pump hot and cold water unit operates in a rotating defrosting mode, at least one of the N modular machines is controlled to be turned on, and at least one of the N modular machines is kept in a shutdown state.

S4, according to the outdoor ambient temperature T4 and the inlet water temperature Tin of any modular machine that is turned on, control any one of the open modular machines and any modular machine in the stopped state to alternately perform heating operation, and maintain any modular machine that is turned on. The fan in the middle is continuously operated with the fan in any of the modular machines in the shutdown state to defrost by forced convection heat transfer of the fan.

That is to say, when the air-cooled heat pump cold and hot water unit is operated in the rotation and defrosting mode, firstly one or more of the N modular machines are turned on, and it is necessary to ensure that at least one of the modular machines is in a shutdown state, and then according to the detected outdoor The ambient temperature T4 and the inlet water temperature Tin parameter are used to feed back the frosting condition of the opened modular machine, and the shutdown and rotation of the inter-compressor compressor are completed by the above-mentioned detected parameters and preset conditions, wherein the rotated modular machine only The compressor is stopped, the fan is not stopped, and the forced convection heat transfer of the fan is defrosted, thereby realizing the rotation and defrosting between the module machine and the module machine.

Therefore, the defrosting control method of the air-cooling heat pump cold and hot water unit according to the embodiment of the present invention controls the air-cooling heat pump cold and hot water unit to operate in a rotating defrosting mode, and does not need to convert the cooling operation and the stop fan to perform defrosting, and It is the switching between the modular machines, and the defrosting is carried out by the continuous operation of the fan itself, thereby reducing the heating attenuation during the heating and defrosting, greatly improving the heating effect and improving the user experience.

According to an embodiment of the present invention, when any of the module machines that are turned on is the main module machine, and any of the module machines in the stopped state is the first slave module machine, the outdoor environment temperature T4 and the opening in the above step S4 are performed. The inlet water temperature of any module machine controls the operation of any module machine that is turned on and the heating operation of any module machine that is in the shutdown state. Specifically, it includes: a1, controlling the compressor in the main module machine to start up to make the main module mechanism hot. Running, and after the first preset time of the heating operation of the main module machine, determining whether the outdoor ambient temperature T4 and the inlet water temperature Tin of the main modular machine satisfy the first preset condition; b1, if judging the outdoor ambient temperature T4 and the main The inlet water temperature Tin of the module machine meets the first preset condition, then the main module machine is controlled to enter the frost accumulation mode, and the cumulative frosting time of the main module machine is obtained; c1, when the cumulative frosting time of the main module machine reaches the first time At the threshold, the compressor in the main module machine is controlled to stop, the fan in the main module machine continues to run, and the compressor in the first slave module machine is controlled to be turned on to enable the first slave module mechanism to operate thermally. And determining, after the second slave module machine performs the heating operation for the second predetermined time, whether the outdoor ambient temperature T4 and the inlet water temperature Tin of the first slave module machine meet the second preset condition; d1, if the outdoor ambient temperature T4 is determined And the first sub-module machine inlet water temperature Tin meets the second preset condition, then controls the first slave module machine to enter the frost accumulation mode, and acquires the cumulative frosting time of the first slave module machine; e1, when the first slave When the accumulated frosting time of the module machine reaches the second time threshold, the compressor in the first slave module machine is controlled to stop, the fan in the first slave module machine continues to run, and the process returns to step a1.

Specifically, as shown in FIG. 4A, the defrosting control process when the air-cooled heat pump cold and hot water unit is operated in the rotating defrosting mode includes the following steps:

S301. The air-cooled heat pump hot and cold water unit operates in a heating mode after receiving the power-on command.

S302: Control the compressor in the main module machine to be turned on to make the main module mechanism run hot, and after the main module mechanism is hot to run for the first preset time t1, perform step S303.

S303, judging whether the outdoor ambient temperature T4 and the inlet water temperature Tin of the main modular machine determine whether the outdoor ambient temperature T4 and the inlet water temperature Tin of the main modular machine satisfy the first preset condition, wherein the first preset condition is based on actual conditions The situation is calibrated. If yes, step S304 is performed; if not, control the main module machine to continue the heating operation for a third preset time, and then return to step S303.

If it is determined that the outdoor ambient temperature T4 and the inlet water temperature Tin of the main module machine do not satisfy the first preset condition, the main module machine is controlled to continue to perform the third preset time after the heating operation, and then return. It is further determined whether the outdoor ambient temperature T4 and the inlet water temperature Tin of the main modular machine satisfy the first preset condition.

S304. Control the main module machine to enter a frost accumulation mode, and obtain a cumulative frosting time Ta.

S305. Determine whether the accumulated frosting time Ta reaches the first time threshold, that is, the set rotation total time. If yes, go to step S306; if no, go back to step S305 and continue the judgment.

S306, controlling the compressor in the main module machine to stop, keeping the fan in the main module machine running, and controlling the compressor in the first slave module machine to be turned on to enable the first slave module mechanism to operate hot, and in the first slave module After the mechanism heats up for the second preset time t2, step S307 is performed.

S307, judging whether the outdoor ambient temperature T4 and the inflow water temperature Tin of the first slave module machine determine whether the outdoor ambient temperature T4 and the inlet water temperature Tin of the first slave module machine satisfy the second preset condition, wherein the second pre-condition The conditions are also calibrated according to the actual situation. If yes, step S308 is performed; if not, control the first slave module machine to continue the heating operation for a fourth preset time, and then return to step S307.

If it is determined that the outdoor ambient temperature T4 and the inlet water temperature Tin of the first slave module machine do not satisfy the second preset condition, controlling the first slave module machine to continue the heating operation of the fourth preset After the time, the returning continues to determine whether the outdoor ambient temperature T4 and the inlet water temperature Tin of the first slave module machine satisfy the second preset condition.

S308. Control the first slave module machine to enter a frost accumulation mode, and obtain a cumulative frosting time Tb.

S309. Determine whether the accumulated frosting time Tb reaches the second time threshold, that is, the set rotation cumulative time. If yes, go to step S310; if no, go back to step S309 and continue the judgment.

S310. Control the compressor in the first slave module machine to stop, keep the fan in the first slave module machine continue to run, and then return to step S302.

It can be seen that, in the embodiment of the present invention, when the air-cooling heat pump cold and hot water unit is controlled to operate in the rotation and defrosting mode, the main module machine and the first slave module machine can be alternately switched, and the fan is used. The operation continues to cause the frost on the corresponding air conditioner heat exchanger to absorb the heat of the surrounding environment, thereby reducing the heating attenuation during the heating and defrosting, greatly improving the heating effect and improving the user experience.

Therefore, when the air-cooled heat pump hot and cold water unit is operated in the rotation and defrosting mode, the defrosting is carried out by means of non-stop fan, and the four-way valve reversing is not involved in the defrosting process, so intermittent cooling (refrigeration does not occur). The defrosting) causes the water temperature of the air-cooled heat pump water chiller unit to fluctuate, and the heating effect of the air-cooled heat pump chiller and water unit does not decay, improving the user experience.

According to the defrosting control method of the air-cooled heat pump water chiller unit according to the embodiment of the present invention, when the air-cooling heat pump cold and hot water unit is operated in the rotation defrosting mode by the outdoor environment temperature T4 detected in real time, the N module machines are controlled. At least one module machine is turned on, and at least one of the N modular machines is kept in a shutdown state, and then any module that is turned on is controlled according to the outdoor ambient temperature T4 and the inlet water temperature Tin of any of the opened modular machines. Any modular machine in the shutdown state alternates heating operation, and keeps the fan in any module machine that is turned on and the fan in any module machine in the shutdown state continue to operate to defoam by forced convection heat transfer of the fan. Therefore, there is no need to convert to a cooling operation and a fan stop to perform defrosting, thereby reducing the heating attenuation during heating and defrosting, greatly improving the heating effect of the air-cooling heat pump chiller and hot water unit, and improving the user experience.

According to a second embodiment of the present invention, when the operating parameters of each of the modular machines include the inlet temperature T3 of each of the air conditioner heat exchangers in each of the modular machines, the inlet temperature of each of the air conditioner heat exchangers is also T3 obtains the inlet temperature change rate ΔT3 of each air conditioner heat exchanger, according to the inlet temperature change rate ΔT3a of each air conditioner heat exchanger corresponding to any modular machine that is turned on, and corresponding to any modular machine in the shutdown state. The inlet temperature change rate of each air conditioner heat exchanger is △T3b control Any one of the modular machines that are turned on alternates with the heating of any of the modular machines in the stopped state, and keeps the fan in any of the opened modular machines and the fan in any of the modular machines in the stopped state continuously running, Defrost by forced convection heat transfer of the fan. That is to say, as shown in FIG. 3B, the defrosting control method of the air-cooled heat pump water chiller unit comprises the following steps:

S11, detecting the outdoor ambient temperature T4 in real time, and detecting the inlet temperature T3 of each air conditioner heat exchanger in each modular machine in real time.

Wherein, the outdoor ambient temperature T4 can be detected by the outdoor temperature sensor, and the inlet temperature T3 can be detected by a temperature sensor disposed at the inlet of each of the air conditioner heat exchangers.

S21: Obtain an inlet temperature change rate ΔT3 of each air conditioner heat exchanger according to an inlet temperature T3 of each air conditioner heat exchanger detected in real time.

That is, ΔT3 is the decay rate of the inlet temperature of each of the air conditioner heat exchangers.

S31, when the air-cooled heat pump cold and hot water unit enters the defrosting mode, it is determined according to the outdoor ambient temperature T4 whether to control the air-cooled heat pump hot and cold water unit to operate in a rotating defrosting mode.

According to an embodiment of the present invention, when the air-cooled heat pump cold and hot water unit enters the defrosting mode, wherein if the outdoor ambient temperature T4 is greater than the first preset temperature, the air-cooled heat pump hot and cold water unit is controlled to rotate the defrosting mode. Running; if the outdoor ambient temperature T4 is less than or equal to the first preset temperature, then the air-cooled heat pump hot and cold water unit is controlled to operate in a conventional defrosting mode.

Among them, it should be noted that the first preset temperature can be calibrated according to the specific conditions of the air-cooled heat pump hot and cold water unit. Moreover, the conventional defrosting method refers to the chilling of the air-cooled heat pump hot and cold water unit or the normal cooling operation and the stopping fan. That is to say, when the outdoor ambient temperature T4 is relatively low, the air-cooled heat pump hot and cold water unit still passes the normal state. Cooling operation and fan stop for defrosting. The air-cooled heat pump water chiller unit operates in a rotating defrosting mode, that is, a defrosting between the module machines, only for a specific outdoor ambient temperature.

S41. If the air-cooling heat pump hot and cold water unit operates in a rotating defrosting mode, at least one of the N modular machines is controlled to be turned on, and at least one of the N modular machines is kept in a shutdown state.

S51, according to the inlet temperature change rate ΔT3a of each air conditioner heat exchanger corresponding to any modular machine that is turned on, and the inlet temperature change rate ΔT3b of each air conditioner heat exchanger corresponding to any modular machine in the shutdown state, Any modular machine that is turned on alternates with any modular machine in the shutdown state to maintain heating operation, and keeps the fan in any module machine that is turned on and the fan in any modular machine that is in the shutdown state continuously run to pass the fan. The forced convection heat transfer is defrosted.

That is to say, when the air-cooled heat pump hot and cold water unit operates in the rotation and defrosting mode, first one or more of the N modular machines are turned on, and it is necessary to ensure that at least one of the modular machines is in a shutdown state, and then according to each detected The inlet temperature parameter of the air conditioner heat exchanger is used to feedback the frost condition of the opened module machine, and the shutdown and rotation of the compressor between the modules are completed by the above-mentioned detected parameters and preset conditions, wherein the rotated module machine only Stop the compressor, keep the fan, The defrosting is performed by forced convection heat transfer of the fan, thereby realizing the rotation and defrosting between the module machine and the module machine.

Therefore, the defrosting control method of the air-cooling heat pump cold and hot water unit according to the embodiment of the present invention controls the air-cooling heat pump cold and hot water unit to operate in a rotating defrosting mode, and does not need to convert the cooling operation and the stop fan to perform defrosting, and It is the switching between the modular machines, and the defrosting is carried out by the continuous operation of the fan itself, thereby reducing the heating attenuation during the heating and defrosting, greatly improving the heating effect and improving the user experience.

According to an embodiment of the present invention, when any of the module machines that are turned on is the main module machine, and any of the module machines that are in the shutdown state is the first slave module machine, the corresponding one of the module machines according to the step S51 is corresponding. The inlet temperature change rate ΔT3a of each air conditioner heat exchanger and the inlet temperature change rate ΔT3b of each air conditioner heat exchanger corresponding to any modular machine in the stop state control any module machine that is turned on and is in a stop state The alternate heating operation of any module machine specifically includes: a2, controlling the compressor in the main module machine to be turned on to enable the main module mechanism to operate hot, and obtaining the cumulative frosting time of the main module machine after the main module mechanism is hot running; b2 When the accumulated frosting time of the main module machine reaches the third time threshold or the inlet temperature change rate ΔT3a of any air conditioner heat exchanger in the main module machine is greater than or equal to the first preset value, the compressor in the main module machine is controlled to be stopped. The fan in the main module machine continues to operate, and controls the compressor in the first slave module machine to be powered on to enable the first slave module mechanism to operate hot, and after the first slave module mechanism is hot running The cumulative frosting time of the first slave module machine; c2, when the cumulative frosting time of the first slave module machine reaches the fourth time threshold or the inlet temperature change rate ΔT3b of any one of the first slave module machines is greater than When the first preset value is equal, the compressor in the first slave module machine is stopped, the fan in the first slave module machine continues to run, and the process returns to step a2.

Specifically, as shown in FIG. 4B, the defrosting control process when the air-cooled heat pump cold and hot water unit is operated in the rotating defrosting mode includes the following steps:

S301B, the air-cooled heat pump water chiller unit runs in the heating mode after receiving the power-on command.

S302B, controlling the compressor in the main module machine to be turned on to make the main module mechanism operate hot.

S303B, the main module machine performs a frost accumulation accumulation time, and acquires a cumulative frosting time ta.

S304B: Determine whether an inlet temperature change rate ΔT3a of any one of the air conditioners in the main module machine is greater than or equal to a first preset value Tv. If yes, go to step S306B; if no, go to step S305B. The first preset value Tv is calibrated according to a specific situation.

S305B: Determine whether the cumulative frosting time ta reaches a third time threshold. If yes, go to step S306B; if no, go back to step S303B, that is, when the cumulative frosting time of the main module machine does not reach the third time threshold and each air conditioner heat exchange in the main module machine When the inlet temperature change rate ΔT3a of the device is less than the first preset value, the main module machine is controlled to continue the heating operation. The third time threshold can be set according to actual conditions.

S306B, controlling the compressor in the main module machine to stop, keeping the fan in the main module machine running, and controlling the compressor in the first slave module machine to open to enable the first slave module mechanism to operate hot.

S307B, the first slave module machine performs a frost accumulation accumulation time, and acquires a cumulative frosting time tb.

S308B: Determine whether an inlet temperature change rate ΔT3b of any one of the first slave module machines is greater than or equal to a first preset value Tv. If yes, go to step S310B; if no, go to step S309B.

S309B: Determine whether the accumulated frosting time tb reaches the fourth time threshold. If yes, go to step S310B; if no, go back to step S307B, that is, when the cumulative frosting time of the first slave module machine does not reach the fourth time threshold and each of the first slave modules When the inlet temperature change rate ΔT3b of the air conditioner heat exchangers is less than the first preset value, the first slave module machine is controlled to continue the heating operation. The fourth time threshold can also be set according to actual conditions.

S310B, controlling the compressor stop in the first slave module machine, keeping the fan in the first slave module machine continue to run, and then returning to step S302B.

It can be seen that, in the embodiment of the present invention, when the air-cooling heat pump cold and hot water unit is controlled to operate in the rotation and defrosting mode, the main module machine and the first slave module machine can be alternately switched, and the fan is used. The operation continues to cause the frost on the corresponding air conditioner heat exchanger to absorb the heat of the surrounding environment, thereby reducing the heating attenuation during the heating and defrosting, greatly improving the heating effect and improving the user experience.

Therefore, when the air-cooled heat pump hot and cold water unit is operated in the rotation and defrosting mode, the defrosting is carried out by means of non-stop fan, and the four-way valve reversing is not involved in the defrosting process, so intermittent cooling (refrigeration does not occur). The defrosting) causes the water temperature of the air-cooled heat pump water chiller unit to fluctuate, and the heating effect of the air-cooled heat pump chiller and water unit does not decay, improving the user experience.

According to the defrosting control method of the air-cooled heat pump cold and hot water unit according to the embodiment of the present invention, the outdoor ambient temperature T4 is detected in real time, and the inlet temperature T3 of each air conditioner heat exchanger in each modular machine is detected in real time, and then detected in real time. The outdoor ambient temperature T4 determines that the air-cooled heat pump hot and cold water unit operates in the rotating defrosting mode, controls at least one of the N modular machines to be turned on, and keeps at least one of the N modular machines in a shutdown state, and then The opening temperature is controlled according to the inlet temperature change rate ΔT3a of each air conditioner heat exchanger corresponding to any modular machine that is turned on and the inlet temperature change rate ΔT3b of each air conditioner heat exchanger corresponding to any modular machine in the shutdown state. Any module machine alternates with any modular machine in the shutdown state to maintain heating operation, and keeps the fan in any module machine that is turned on and the fan in any module machine that is in the shutdown state continuously run to force the fan through The convection heat transfer is defrosted, so that it does not need to be converted into a cooling operation and a fan stop for defrosting, reducing the heating decay during heating and defrosting, and greatly improving air cooling. Heating effect pump water chiller, improve the user experience.

According to a third embodiment of the present invention, when the operating parameters of each of the modular machines include the low-pressure side pressure of each of the compressors in each of the modular machines, each compression is also acquired according to the low-pressure side pressure of each of the compressors The low pressure side pressure change rate ΔP of the machine is based on the low pressure side pressure change rate ΔPa of each compressor corresponding to any modular machine that is turned on, and the low pressure side of each compressor corresponding to any modular machine in the stop state. The pressure change rate ΔPb controls any module machine that is turned on to alternately heat the operation with any module machine in the stop state, and keeps the fan in the module machine that is turned on and is in the stop. The fan in any of the modular machines continues to operate to defrost by forced convection heat transfer from the fan. That is to say, as shown in FIG. 3C, the defrosting control method of the air-cooled heat pump water chiller unit comprises the following steps:

S13, detecting the outdoor ambient temperature T4 in real time, and detecting the low pressure side pressure of each compressor in each modular machine in real time.

Wherein, the outdoor ambient temperature T4 can be detected by the outdoor temperature sensor, and the low pressure side pressure can be detected by a pressure sensor disposed at the return port of each compressor.

S23, obtaining a low pressure side pressure change rate ΔP of each compressor based on the low pressure side pressure of each compressor detected in real time.

That is, ΔP is the return pressure decay rate of each compressor.

S33, when the air-cooled heat pump cold and hot water unit enters the defrosting mode, the outdoor ambient temperature T4 is judged.

S43. If the outdoor ambient temperature T4 is greater than the first preset temperature, the air-cooled heat pump hot and cold water unit is controlled to operate in a rotating defrosting mode according to the low pressure side pressure change rate ΔP of each compressor.

According to an embodiment of the present invention, if the outdoor ambient temperature T4 is less than or equal to the first preset temperature, the air-cooled heat pump hot and cold water unit is controlled to operate in a conventional defrosting mode.

Among them, it should be noted that the first preset temperature can be calibrated according to the specific conditions of the air-cooled heat pump hot and cold water unit. Moreover, the conventional defrosting method refers to the chilling of the air-cooled heat pump hot and cold water unit or the normal cooling operation and the stopping fan. That is to say, when the outdoor ambient temperature T4 is relatively low, the air-cooled heat pump hot and cold water unit still passes the normal state. Cooling operation and fan stop for defrosting. The air-cooled heat pump water chiller unit operates in a rotating defrosting mode, that is, a defrosting between the module machines, only for a specific outdoor ambient temperature.

In an embodiment of the present invention, when the air-cooled heat pump cold and hot water unit is operated in the rotation defrosting mode, at least one of the N modular machines is controlled to be turned on, and at least one of the N modular machines is kept at The shutdown state; and controlling the low-pressure side pressure change rate ΔPa of each compressor corresponding to any of the modular machines that are turned on and the low-pressure side pressure change rate ΔPb of each compressor corresponding to any of the modular machines in the stopped state Any modular machine that is turned on alternates with any modular machine in the shutdown state to maintain heating operation, and keeps the fan in any module machine that is turned on and the fan in any modular machine that is in the shutdown state continuously run to pass the fan. The forced convection heat transfer is defrosted.

That is to say, when the air-cooled heat pump hot and cold water unit operates in the rotation and defrosting mode, first one or more of the N modular machines are turned on, and it is necessary to ensure that at least one of the modular machines is in a shutdown state, and then according to each detected The return air pressure parameter of the compressor feeds back the frosting condition of the open modular machine, and at the same time, the shutdown and rotation of the compressor between the modules are completed by the above-mentioned detected parameters and preset conditions, wherein the rotated modular machine only stops. The compressor and the non-stop fan are defrosted by the forced convection heat transfer of the fan, thereby realizing the rotation and defrosting between the module machine and the module machine.

Therefore, the defrosting control method of the air-cooling heat pump cold and hot water unit according to the embodiment of the present invention controls the air-cooling heat pump cold and hot water unit to operate in a rotating defrosting mode, and does not need to convert the cooling operation and the stop fan to perform defrosting, and It is the switching between the module machines, and the defrosting is carried out by the continuous operation of the fan itself, thereby reducing the heating attenuation during the heating and tempering, greatly improving Heating effect to improve user experience.

According to an embodiment of the present invention, when any of the module machines that are turned on is the main module machine, and any of the module machines in the stopped state is the first slave module machine, each compressor corresponding to any of the opened modular machines The low pressure side pressure change rate ΔPa and the low pressure side pressure change rate ΔPb of each compressor corresponding to any modular machine in the stop state control any modular machine that is turned on alternates with any modular machine in the stop state The hot operation specifically includes: a3, controlling the compressor in the main module machine to be turned on to make the main module mechanism run hot, and obtaining the cumulative frosting time of the main module machine after the main module mechanism is hot running; b3, when the cumulative accumulation of the main module machine When the frost time reaches the fifth time threshold or the low pressure side pressure change rate ΔPa of any compressor in the main module machine is greater than or equal to the second preset value, the compressor in the main module machine is stopped, and the fan in the main module machine continues. Operating, and controlling the compressor in the first slave module machine to be powered on to cause the first slave module mechanism to operate thermally, and to obtain the cumulative frosting of the first slave module machine after the first slave module mechanism is hot running Time; c3, when the cumulative frosting time of the first slave module machine reaches the sixth time threshold or the low pressure side pressure change rate ΔPb of any compressor in the first slave module machine is greater than or equal to the second preset value, the control As soon as the compressor in the modular machine is stopped, the fan in the first slave module machine continues to run and returns to step a3.

Specifically, as shown in FIG. 4C, the defrosting control flow when the air-cooled heat pump cold and hot water unit is operated in the rotating defrosting mode includes the following steps:

S301C, the air-cooled heat pump water chiller unit runs in the heating mode after receiving the power-on command.

S302C, controlling the compressor in the main module machine to be turned on to make the main module mechanism operate hot.

In S303C, the main module machine performs a frost accumulation accumulation time and acquires a cumulative frosting time ta.

S304C: Determine whether the low-pressure side pressure change rate ΔPa of any of the compressors in the main module machine is greater than or equal to a second preset value Pv. If yes, go to step S306C; if no, go to step S305C. The second preset value Pv is calibrated according to a specific situation.

S305C: Determine whether the cumulative frosting time ta reaches a fifth time threshold. If yes, go to step S306C; if no, go back to step S303C, that is, when the cumulative frosting time of the main module machine does not reach the fifth time threshold and each compressor in the main module machine When the low pressure side pressure change rate ΔPa is less than the second preset value, the main module machine is controlled to continue the heating operation. The fifth time threshold can be set according to actual conditions.

S306C, controlling the compressor in the main module machine to stop, keeping the fan in the main module machine running, and controlling the compressor in the first slave module machine to open to enable the first slave module mechanism to operate hot.

S307C, the first slave module machine performs a frost accumulation accumulation time, and acquires a cumulative frosting time tb.

S308C: Determine whether the low-pressure side pressure change rate ΔPb of any one of the first slave module machines is greater than or equal to a second preset value Pv. If yes, step S310C is performed; if no, step S309C is performed.

S309C, it is determined whether the cumulative frosting time tb reaches the sixth time threshold. If yes, go to step S310C; if no, go back to step S307C, that is, when the cumulative frosting time of the first slave module machine does not reach the sixth The first slave module machine is controlled to continue the heating operation when the time threshold is reached and the low pressure side pressure change rate ΔPb of each compressor in the first slave module machine is less than the second preset value. The sixth time threshold can also be set according to actual conditions.

S310C, controlling the compressor stop in the first slave module machine, keeping the fan in the first slave module machine continue to run, and then returning to step S302C.

It can be seen that, in the embodiment of the present invention, when the air-cooling heat pump cold and hot water unit is controlled to operate in the rotation and defrosting mode, the main module machine and the first slave module machine can be alternately switched, and the fan is used. The operation continues to cause the frost on the corresponding air conditioner heat exchanger to absorb the heat of the surrounding environment, thereby reducing the heating attenuation during the heating and defrosting, greatly improving the heating effect and improving the user experience.

Therefore, when the air-cooled heat pump hot and cold water unit is operated in the rotation and defrosting mode, the defrosting is carried out by means of non-stop fan, and the four-way valve reversing is not involved in the defrosting process, so intermittent cooling (refrigeration does not occur). The defrosting) causes the water temperature of the air-cooled heat pump water chiller unit to fluctuate, and the heating effect of the air-cooled heat pump chiller and water unit does not decay, improving the user experience.

The defrosting control method of the air-cooled heat pump water chiller according to the embodiment of the present invention detects the outdoor ambient temperature T4 in real time, and detects the low pressure side pressure of each compressor in each modular machine in real time, and then passes the real-time detection outdoor environment. When the temperature T4 determines that the air-cooling heat pump cold and hot water unit is operating in the rotating defrosting mode, at least one of the N modular machines is controlled to be turned on, and at least one of the N modular machines is kept in a shutdown state, and then according to the opening The pressure change rate ΔPa of the low pressure side of each compressor corresponding to any of the modular machines and the pressure change rate ΔPb of the low pressure side of each compressor corresponding to any modular machine in the stop state control any modular machine that is turned on Alternate heating operation with any modular machine in the stopped state, and keep the fan in any of the open modular machines and the fan in any modular machine in the stopped state continue to operate, through forced convection heat transfer of the fan Defrost, which eliminates the need to convert to a cooling operation and a fan stop for defrosting, reduces the heating decay during heating and defrosting, and greatly improves the air-cooling heat pump The heating effect of the unit improves the user experience.

According to the fourth embodiment of the present invention, when the operating parameters of each of the modular machines include the influent water temperature Tin corresponding to each of the modular machines and the effluent water temperature Tout corresponding to each of the modular machines, The inlet water temperature Tin corresponding to the module machine and the outlet water temperature Tout corresponding to each of the module machines obtain the temperature difference between the inlet and outlet water of each module machine, so as to be in accordance with the temperature difference between the inlet and outlet water corresponding to any module machine that is turned on, and is in the shutdown state. The temperature difference between the inlet and outlet water corresponding to any modular machine in the state controls whether any of the modular machines that are turned on alternates with the heating operation of any modular machine that is in the shutdown state, and maintains the fan in the module machine that is turned on and is in the shutdown state. The fan in any modular machine is continuously operated to defrost by forced convection heat transfer of the fan. That is to say, as shown in FIG. 3D, the defrosting control method of the air-cooled heat pump cold and hot water unit includes the following steps:

S13, detecting the outdoor ambient temperature T4 in real time, and detecting the inlet water temperature and the effluent water temperature corresponding to each modular machine in real time.

Among them, the outdoor temperature sensor T4 can be detected by the outdoor temperature sensor, and can be set in each module machine. The temperature sensor at the water pipe detects the inlet water temperature of the corresponding module machine, and detects the water temperature of the corresponding module machine through a temperature sensor disposed at the outlet pipe of each module machine.

S23, obtaining the temperature difference between the inlet and outlet water of each modular machine according to the influent water temperature and the effluent water temperature detected in real time.

S33, when the air-cooled heat pump cold and hot water unit enters the defrosting mode, the outdoor ambient temperature T4 is judged.

S43. If the outdoor ambient temperature T4 is greater than the first preset temperature, the air-cooled heat pump hot and cold water unit is controlled to operate in a rotating defrosting mode according to the temperature difference between the inlet and outlet water.

According to an embodiment of the present invention, if the outdoor ambient temperature T4 is less than or equal to the first preset temperature, the air-cooled heat pump hot and cold water unit is controlled to operate in a conventional defrosting mode.

Among them, it should be noted that the first preset temperature can be calibrated according to the specific conditions of the air-cooled heat pump hot and cold water unit. Moreover, the conventional defrosting method refers to the chilling of the air-cooled heat pump hot and cold water unit or the normal cooling operation and the stopping fan. That is to say, when the outdoor ambient temperature T4 is relatively low, the air-cooled heat pump hot and cold water unit still passes the normal state. Cooling operation and fan stop for defrosting. The air-cooled heat pump water chiller unit operates in a rotating defrosting mode, that is, a defrosting between the module machines, only for a specific outdoor ambient temperature.

In an embodiment of the present invention, when the air-cooled heat pump cold and hot water unit is operated in a rolling defrosting mode, wherein at least one of the N modular machines is controlled to be turned on, and at least one of the N modular machines is maintained. The machine is in a stop state; and according to the temperature difference between the inlet and outlet water corresponding to any module machine that is turned on and the temperature difference between the inlet and outlet water corresponding to any module machine in the shutdown state, any module machine that is turned on is alternated with any module machine in the shutdown state. The heating operation is performed, and the fan in any of the module machines that are turned on and the fan in any of the module machines in the shutdown state are continuously operated to defrost by forced convection heat transfer of the fan.

That is to say, when the air-cooled heat pump cold and hot water unit is operated in the rotation and defrosting mode, firstly one or more of the N modular machines are turned on, and it is necessary to ensure that at least one of the modular machines is in a stop state, and then according to the acquired access. The water temperature difference parameter feeds back the frost condition of the opened module machine, and at the same time, the shutdown and rotation of the compressor between the modules are completed by the parameters obtained above and the preset conditions, wherein the rotated module machine only stops the compressor, and does not stop. The fan is defrosted by forced convection heat transfer of the fan, thereby realizing the rotation and defrosting between the module machine and the module machine.

Therefore, the defrosting control method of the air-cooling heat pump cold and hot water unit according to the embodiment of the present invention controls the air-cooling heat pump cold and hot water unit to operate in a rotating defrosting mode, and does not need to convert the cooling operation and the stop fan to perform defrosting, and It is the switching between the modular machines, and the defrosting is carried out by the continuous operation of the fan itself, thereby reducing the heating attenuation during the heating and defrosting, greatly improving the heating effect and improving the user experience.

According to an embodiment of the present invention, when any of the module machines that are turned on are the main module machine, and any of the module machines that are in the shutdown state is the first slave module machine, the temperature difference between the inlet and outlet water corresponding to any module machine that is turned on is The temperature difference between the inlet and outlet water of any module machine in the shutdown state controls the alternate heating operation of any module machine that is turned on and any module machine that is in the shutdown state, and specifically includes: a4, controlling the compressor in the main module machine to be turned on to enable The main module mechanism is hot running and in the main module After the fifth preset time of the mechanism heat operation, the temperature difference between the inlet and outlet water of the main module machine is obtained as the initial temperature difference between the first inlet and outlet water, and the cumulative frosting time of the main module machine is acquired; b4, when the cumulative frosting time of the main module machine reaches the seventh time When the threshold or the temperature difference between the inlet and outlet of the main module machine is less than the first preset temperature difference, the compressor in the main module machine is stopped, the fan in the main module machine continues to operate, and the compressor in the first slave module machine is controlled to be turned on. The first slave module mechanism is hot running, wherein the first preset temperature difference is calculated according to the initial temperature difference of the first inlet and outlet water; c4, obtaining the inlet and outlet water of the first slave module machine after the first slave module mechanism is thermally operated for a fifth preset time The temperature difference is the initial temperature difference between the second inlet and outlet water, and the cumulative frosting time of the first slave module machine is obtained; d4, when the cumulative frosting time of the first slave module machine reaches the eighth time threshold or the temperature difference between the inlet and outlet of the first slave module machine When the temperature is less than the second preset temperature difference, the compressor in the first slave module machine is controlled to stop, and the fan of the first slave module machine continues to run, and returns to step a4, wherein the second preset temperature According to a second calculated temperature difference between the initial out of the water.

Specifically, as shown in FIG. 4D, the defrosting control process when the air-cooled heat pump cold and hot water unit operates in the rotating defrosting mode includes the following steps:

S301D, the air-cooled heat pump hot and cold water unit operates in the heating mode after receiving the power-on command.

S302D, controlling the compressor in the main module machine to be turned on to make the main module mechanism run hot, and after the main module mechanism is hot running for a fifth preset time t5, executing step S303D.

S303D, obtaining the temperature difference between the inlet and outlet water of the main module machine is the initial temperature difference Tca of the first inlet and outlet water.

S304D, obtaining the cumulative frosting time ta of the main modular machine.

That is to say, after the fifth preset time t5 of the main module mechanism is hot running, the temperature difference between the inlet and outlet water at this time is recorded as the initial temperature difference Tca of the first inlet and outlet water, and the cumulative accumulation time of the frost is obtained to obtain the cumulative frosting time of the main module machine. Ta.

S305D: Determine whether the temperature difference between the inlet and outlet water of the main module machine is less than the first preset temperature difference. If yes, go to step S307D; if no, go to step S306D. The first preset temperature difference is calculated according to the first temperature difference Tca of the first inlet and outlet water of the main module machine, for example, the first preset temperature difference is Tca*90%.

S306D: Determine whether the cumulative frosting time ta reaches a seventh time threshold, wherein the seventh time threshold is calibrated according to actual conditions. If yes, go to step S307D; if no, go back to step S304D, that is, when the cumulative frosting time of the main module machine does not reach the seventh time threshold and the temperature difference between the inlet and outlet of the main module machine is greater than or equal to When the first preset temperature difference is described, the main module machine is controlled to continue the heating operation.

S307D, controlling the compressor in the main module machine to stop, keeping the fan in the main module machine running, and controlling the compressor in the first slave module machine to open, so that the first slave module mechanism is hot running, and in the first slave module After the mechanism hot runs for the fifth preset time t5, step S308D is performed.

S308D: Obtain a temperature difference between the inlet and outlet water of the first slave module machine as a second temperature difference Tcb of the second inlet and outlet water.

S309D: Acquire a cumulative frosting time tb of the first slave module machine.

That is, after the first slave module mechanism is thermally operated for the fifth preset time t5, the temperature difference between the inlet and outlet water at this time is recorded as the second temperature difference Tcb of the second inlet and outlet water, and the frost accumulation cumulative timing is performed to obtain the first slave module machine. Cumulative frosting time Tb.

S310D: Determine whether the temperature difference between the inlet and outlet water of the first slave module machine is less than the second preset temperature difference. If yes, go to step S312D; if no, go to step S311D. The second preset temperature difference is calculated according to the second inlet and outlet water temperature difference Tcb of the first slave module machine, for example, the second preset temperature difference is Tcb*90%.

S311D: Determine whether the accumulated frosting time tb reaches an eighth time threshold, wherein the eighth time threshold is calibrated according to actual conditions. If yes, go to step S312D; if no, go back to step S309D, that is, when the accumulated frosting time of the first slave module machine does not reach the eighth time threshold and the first slave module machine enters and exits water When the temperature difference is greater than or equal to the second preset temperature difference, the first slave module machine is controlled to continue the heating operation.

S312D, controlling the compressor in the first slave module machine to stop, keeping the fan in the first slave module machine continue to run, and then returning to step S302D.

It can be seen that, in the embodiment of the present invention, when the air-cooling heat pump cold and hot water unit is controlled to operate in the rotation and defrosting mode, the main module machine and the first slave module machine can be alternately switched, and the fan is used. The operation continues to cause the frost on the corresponding air conditioner heat exchanger to absorb the heat of the surrounding environment, thereby reducing the heating attenuation during the heating and defrosting, greatly improving the heating effect and improving the user experience.

Therefore, when the air-cooled heat pump hot and cold water unit is operated in the rotation and defrosting mode, the defrosting is carried out by means of non-stop fan, and the four-way valve reversing is not involved in the defrosting process, so intermittent cooling (refrigeration does not occur). The defrosting) causes the water temperature of the air-cooled heat pump water chiller unit to fluctuate, and the heating effect of the air-cooled heat pump chiller and water unit does not decay, improving the user experience.

According to the defrosting control method of the air-cooled heat pump water chiller unit according to the embodiment of the invention, the outdoor environment temperature T4 is detected in real time, and the inlet water temperature and the effluent water temperature corresponding to each module machine are detected in real time to obtain the inlet and outlet water of each module machine. The temperature difference is then determined by the outdoor ambient temperature T4 detected in real time, when the air-cooled heat pump hot and cold water unit is operated in the rotation defrosting mode, at least one of the N modular machines is controlled to be turned on, and at least one of the N modular machines is maintained. The module machine is in the stop state, and then according to the temperature difference between the inlet and outlet water corresponding to any module machine that is turned on and the temperature difference between the inlet and outlet water corresponding to any module machine in the shutdown state, any module machine that is turned on and any module machine that is in the shutdown state are controlled. Alternate heating operation, and keep the fan in any module machine that is turned on and the fan in any module machine in the shutdown state continue to operate, to defoam by forced convection heat transfer of the fan, so that there is no need to convert to cooling operation And stop the fan to carry out defrosting, reduce the heating attenuation during the heating and defrosting, and greatly improve the heating effect of the air-cooled heat pump hot and cold water unit Improve the user experience.

The embodiment of the invention further provides an air-cooled heat pump cold and hot water unit, comprising: N modular machines, wherein the outlet pipes of each of the modular machines are respectively connected to the total output of the air-cooled heat pump hot and cold water unit a water pipe, each of the inlet pipes of the modular machine is respectively connected to a total inlet pipe of the air-cooled heat pump water chiller unit, so that the N module machines are connected in parallel, wherein N is an integer greater than or equal to 2; a first temperature detecting module, configured to detect an outdoor ambient temperature T4 in real time; an acquiring module, configured to acquire operating parameters of each of the modular machines; and a control module, configured to enter the air-cooling heat pump hot and cold water unit When entering the defrosting mode, determining whether to control the air-cooling heat pump chiller and hot water unit to operate in a rotating defrosting mode according to the outdoor ambient temperature T4, wherein if the air-cooling heat pump chiller and water unit operates in a rotating defrosting mode, The control module controls at least one of the N modular machines to be turned on, and keeps at least one of the N modular machines in a shutdown state, and according to the outdoor ambient temperature T4 and any of the open The operating parameters of the module machine control whether any of the module machines that are turned on alternately operate with any of the module machines in the stopped state, and maintain the fan in any of the module machines that are turned on and any module machine that is in the shutdown state. The fan is continuously operated to defrost by forced convection heat transfer from the fan.

The operating parameters of each of the modular machines may include an influent water temperature Tin corresponding to each of the modular machines, an outlet water temperature Tout corresponding to each of the modular machines, and an air conditioning heat exchange in each of the modular machines. The inlet temperature T3 of the device, the low pressure side pressure of each compressor in each of the modular machines.

According to the air-cooled heat pump water chiller unit according to the embodiment of the present invention, when operating in the rotation defrosting mode, the control module controls at least one of the N modular machines to be turned on, and maintains at least one of the N modular machines In the stop state, then according to the outdoor ambient temperature T4 and the operating parameters of any module machine that is turned on, any one of the module machines that are turned on is alternately heated with any module machine in the stopped state, and any module that is turned on is maintained. The fan in the machine and the fan in any modular machine in the stop state continue to operate to defoam by forced convection heat transfer of the fan, that is, through the switching between the module machines, the defrosting is performed by using the continuous operation of the fan itself. Therefore, it is not necessary to perform defrosting by converting the cooling operation and stopping the fan, thereby reducing the heating attenuation during the heating and defrosting, greatly improving the heating effect and improving the user experience.

According to the first embodiment of the present invention, when the operating parameters of each of the modular machines include the influent water temperature Tin corresponding to each of the modular machines, the air-cooled heat pump cold and hot water unit comprises: N modular machines 100, The first temperature detecting module, the second temperature detecting module, and the control module, N is an integer greater than or equal to 2.

Wherein, as shown in FIG. 1 , the outlet pipes of each modular machine 100 are respectively connected to the total outlet pipes of the air-cooled heat pump hot and cold water units, and the inlet pipes of each modular machine 100 are respectively connected to the air-cooled heat pump hot and cold water. The total inlet pipe of the unit is used to realize the parallel connection of N modular machines.

And, as shown in FIG. 2, each modular machine 100 may include a plurality of hot water heating systems such as two (a first hot water system and a second hot water system), wherein the first hot water system The air conditioner heat exchanger and the air conditioner heat exchanger in the second hot water system share one fan and share the same water side heat exchanger.

Specifically, as shown in FIG. 2, the first hot water system includes a compressor 11, an exhaust temperature switch 12, a high pressure switch 13, a four-way valve 14, a low pressure switch 15, a low pressure irrigation 16, and an air conditioning heat exchanger 17, The electronic expansion valve 18, the second hot water system also includes a compressor 21, an exhaust temperature switch 22, a high pressure switch 23, a four-way valve 24, a low pressure switch 25, a low pressure irrigation 26, an air conditioning heat exchanger 27, and an electronic expansion valve 28. . Moreover, the air conditioning heat exchanger 17 in the first hot water system and the air conditioning heat exchanger 27 in the second hot water system share a single fan 10, and the first hot water system and the second hot water system also share water. The side heat exchanger is the casing heat exchanger 20, and at the same time, the temperature is set at the outlet pipe of the casing heat exchanger 20 and the inlet pipe. The sensor is provided with a flow sensor at the outlet pipe, and a temperature sensor 19 is provided between the air conditioner heat exchanger 17 and the electronic expansion valve 18, and a temperature sensor 29 is provided between the air conditioner heat exchanger 27 and the electronic expansion valve 28.

In an embodiment of the invention, the first temperature detecting module, such as an outdoor temperature sensor, is used to detect the outdoor ambient temperature T4 in real time, and the second temperature detecting module (such as the temperature sensor 101 disposed at the inlet of each modular machine) is used for real time. Detecting the influent water temperature Tin corresponding to each modular machine, and the control module is configured to determine whether to control the air-cooled heat pump hot and cold water unit to operate in a rotating defrosting mode according to the outdoor environmental temperature T4 when the air-cooled heat pump hot and cold water unit enters the defrost mode. Wherein, if the air-cooled heat pump hot and cold water unit operates in a rotating defrosting mode, the control module controls at least one of the N modular machines to be turned on, and keeps at least one of the N modular machines in a shutdown state, and According to the outdoor ambient temperature T4 and the inlet water temperature Tin of any modular machine that is turned on, any modular machine that is turned on is alternately heated with any modular machine that is in a stopped state, and is maintained in any of the modular machines that are turned on. The fan and the fan in any of the modular machines in the shutdown state continue to operate to defrost the forced convection heat transfer of the fan.

Further, when the air-cooled heat pump hot and cold water unit enters a defrosting mode, wherein the control module controls the air-cooled heat pump cold and hot water unit if the outdoor ambient temperature T4 is greater than a first preset temperature The operation is performed in a rotating defrosting mode; if the outdoor ambient temperature T4 is less than or equal to the first preset temperature, the control module controls the air-cooled heat pump cold and hot water unit to operate in a conventional defrosting mode.

Among them, it should be noted that the first preset temperature can be calibrated according to the specific conditions of the air-cooled heat pump hot and cold water unit. Moreover, the conventional defrosting method refers to the chilling of the air-cooled heat pump hot and cold water unit or the normal cooling operation and the stopping fan. That is to say, when the outdoor ambient temperature T4 is relatively low, the air-cooled heat pump hot and cold water unit still passes the normal state. Cooling operation and fan stop for defrosting. The air-cooled heat pump water chiller unit operates in a rotating defrosting mode, that is, a defrosting between the module machines, only for a specific outdoor ambient temperature.

Specifically, according to an embodiment of the present invention, when any module machine that is turned on is a main module machine, and any module machine in a stopped state is a first slave module machine, the control module implements control by using the following control flow. The main module machine and the first slave module machine alternately perform heating operations:

A1, controlling the compressor in the main module machine to be turned on to enable the main module mechanism to operate hot, and determining the outdoor ambient temperature T4 and the location after the main module machine performs heating operation for a first preset time Whether the inlet water temperature Tin of the main module machine satisfies the first preset condition;

B1, if it is determined that the outdoor ambient temperature T4 and the inlet water temperature Tin of the main modular machine meet the first preset condition, controlling the main modular machine to enter a frost accumulation mode, and acquiring the main modular machine Cumulative frosting time;

C1, when the accumulated frosting time of the main modular machine reaches a first time threshold, controlling the compressor in the main modular machine to stop, the fan in the main modular machine continues to operate, and controlling the first slave The compressor in the modular machine is powered on to cause the first slave module mechanism to operate thermally, and after the first slave module machine performs a heating operation for a second predetermined time, determining the outdoor ambient temperature T4 and the first Whether the inlet water temperature Tin of the slave module meets the second preset condition;

D1, if it is determined that the outdoor ambient temperature T4 and the inlet water temperature Tin of the first slave module machine meet the second preset condition, controlling the first slave module machine to enter a frost accumulation mode, and acquiring The cumulative frosting time of the first slave module machine;

E1, when the accumulated frosting time of the first slave module machine reaches a second time threshold, controlling the compressor in the first slave module machine to stop, the fan in the first slave module machine continues to run, and Go back to step a1.

The first preset condition and the second preset condition are both calibrated according to actual conditions.

And, if it is determined that the outdoor ambient temperature T4 and the inlet water temperature Tin of the main module machine do not satisfy the first preset condition, the control module controls the main module system to continue the heating operation for the third pre-control. After the time is set, the process returns to determine whether the outdoor ambient temperature T4 and the inlet water temperature Tin of the main module machine satisfy the first preset condition. If it is determined that the outdoor ambient temperature T4 and the inlet water temperature Tin of the first slave module machine do not satisfy the second preset condition, the control module controls the first slave module machine to continue heating operation fourth. After the preset time, the process returns to determine whether the outdoor ambient temperature T4 and the inlet water temperature Tin of the first slave module machine satisfy the second preset condition.

In summary, in the embodiment of the present invention, when the air-cooled heat pump cold and hot water unit is operated in the rotation defrosting mode, the switching between the control module machines is alternated between the main module machine and the first slave module machine, for example. Switching, using the continuous operation of the fan itself, the frost on the corresponding air conditioner heat exchanger absorbs the heat of the surrounding environment, thereby reducing the heating attenuation during the heating and defrosting, greatly improving the heating effect and improving the user experience.

According to the air-cooled heat pump water chiller unit according to the embodiment of the present invention, when operating in the rotation defrosting mode, the control module controls at least one of the N modular machines to be turned on, and maintains at least one of the N modular machines In the stop state, then according to the outdoor ambient temperature T4 and the inlet water temperature Tin of any modular machine that is turned on, the control of any of the open modular machines and any modular machine in the stopped state is alternately heated, and the open operation is maintained. The fan in a modular machine and the fan in any modular machine in the stop state continue to operate to defrose by forced convection heat transfer of the fan, that is, by switching between the modular machines, using the continuous operation of the fan itself The defrosting eliminates the need to convert the cooling operation and stop the fan to reduce the heating, reduce the heating attenuation during the heating and defrosting, greatly improve the heating effect and improve the user experience.

According to a second embodiment of the present invention, the air-cooled heat pump cold and hot water unit comprises: N module machines 100, a first temperature detecting module, a second temperature detecting module and a control module, and N is an integer greater than or equal to 2.

Wherein, as shown in FIG. 1 , the outlet pipes of each modular machine 100 are respectively connected to the total outlet pipes of the air-cooled heat pump hot and cold water units, and the inlet pipes of each modular machine 100 are respectively connected to the air-cooled heat pump hot and cold water. The total inlet pipe of the unit is used to realize the parallel connection of N modular machines.

And, as shown in FIG. 2, each modular machine 100 may include a plurality of hot water heating systems such as two (a first hot water system and a second hot water system), each of which includes a compressor and An air conditioner heat exchanger in which an air conditioner heat exchanger in each of the hot water systems, for example, an air conditioner heat exchanger in the first hot water system and an air conditioner heat exchanger in the second hot water system share a fan and share The same water side heat exchanger.

Specifically, as shown in FIG. 2, the first hot water system includes a compressor 11, an exhaust temperature switch 12, a high pressure switch 13, a four-way valve 14, a low pressure switch 15, a low pressure irrigation 16, and a first air conditioning heat exchanger. 17. An electronic expansion valve 18, the second hot water system comprising a compressor 21, an exhaust temperature switch 22, a high pressure switch 23, a four-way valve 24, a low pressure switch 25, a low pressure irrigation 26, a second air conditioning heat exchanger 27, electronics Expansion valve 28. Moreover, the first air conditioning heat exchanger 17 and the second air conditioning heat exchanger 27 share a single fan 10, and the first hot water system and the second hot water system also share a water side heat exchanger, that is, a casing heat exchanger 20, At the same time, a temperature sensor is arranged at the outlet pipe of the casing heat exchanger 20 and the inlet pipe (for example, a temperature sensor 101 is provided at the inlet pipe to detect the inlet water temperature), a flow sensor is arranged at the outlet pipe, and the air conditioner is exchanged. A temperature sensor 19 is provided between the heat exchanger 17 and the electronic expansion valve 18, and a temperature sensor 29 is provided between the air conditioner heat exchanger 27 and the electronic expansion valve 28. The temperature sensor 19 is used to detect the inlet temperature of the first air conditioner heat exchanger in real time, and the temperature sensor 29 is used to detect the inlet temperature of the second air conditioner heat exchanger in real time.

In an embodiment of the invention, the first temperature detecting module, such as an outdoor temperature sensor, is used to detect the outdoor ambient temperature T4 in real time, and the second temperature detecting module (such as a temperature sensor disposed at the inlet of each air conditioner heat exchanger) is used for real time. Detecting an inlet temperature T3 of each of the air conditioner heat exchangers in each of the modular machines, and the control module is configured to obtain an inlet temperature change rate of each air conditioner heat exchanger according to an inlet temperature T3 of each air conditioner heat exchanger detected in real time. T3, and when the air-cooled heat pump hot and cold water unit enters the defrost mode, it is determined according to the outdoor ambient temperature T4 whether to control the air-cooled heat pump hot and cold water unit to operate in a rotating defrosting mode, wherein if the air-cooled heat pump hot and cold water unit is rotated The defrosting mode operates, and the control module controls at least one of the N modular machines to be turned on, and keeps at least one of the N modular machines in a shutdown state, and each air conditioner corresponding to any modular machine that is turned on is replaced. The inlet temperature change rate ΔT3a of the heat exchanger and the inlet temperature change rate ΔT3b of each air conditioner heat exchanger corresponding to any modular machine in the shutdown state control Any module machine of the startup is alternately heated with any module machine in the shutdown state, and the fan in any module machine that is turned on and the fan in any module machine in the shutdown state are continuously operated to pass the fan. The forced convection heat transfer is defrosted.

Further, when the air-cooled heat pump hot and cold water unit enters a defrosting mode, wherein the control module controls the air-cooled heat pump cold and hot water unit if the outdoor ambient temperature T4 is greater than a first preset temperature The operation is performed in a rotating defrosting mode; if the outdoor ambient temperature T4 is less than or equal to the first preset temperature, the control module controls the air-cooled heat pump cold and hot water unit to operate in a conventional defrosting mode.

Among them, it should be noted that the first preset temperature can be calibrated according to the specific conditions of the air-cooled heat pump hot and cold water unit. Moreover, the conventional defrosting method refers to the chilling of the air-cooled heat pump hot and cold water unit or the normal cooling operation and the stopping fan. That is to say, when the outdoor ambient temperature T4 is relatively low, the air-cooled heat pump hot and cold water unit still passes the normal state. Cooling operation and fan stop for defrosting. The air-cooled heat pump water chiller unit operates in a rotating defrosting mode, that is, a defrosting between the module machines, only for a specific outdoor ambient temperature.

Specifically, according to an embodiment of the present invention, when the operating parameter of each of the modular machines includes an inlet temperature T3 of each of the air conditioner heat exchangers in each of the modular machines, the control module is further configured according to each air conditioner. Heat exchanger inlet temperature T3 obtains the inlet temperature change rate ΔT3 of each air conditioner heat exchanger, according to the inlet temperature change rate ΔT3a of each air conditioner heat exchanger corresponding to any modular machine that is turned on, and corresponding to any modular machine in the shutdown state. The inlet temperature change rate ΔT3b of each air conditioner heat exchanger controls the alternate heating operation of any module machine that is turned on and any module machine that is in the shutdown state, and keeps the fan in the module machine that is turned on and is in the shutdown state. The fan in any of the modular machines is continuously operated to defrost by forced convection heat transfer from the fan. Wherein, when any of the module machines that are turned on is the main module machine, and any of the module machines that are in the shutdown state is the first slave module machine, the control module controls the main module machine and the first An alternate heating operation from the modular machine:

Controlling the compressor in the main module machine to be powered on to enable the main module mechanism to operate hot, and acquiring the accumulated frosting time of the main module machine after the main module mechanism is hot running;

B2, when the cumulative frosting time of the main module machine reaches a third time threshold or the inlet temperature change rate ΔT3a of any one of the main module machines is greater than or equal to a first preset value, The compressor in the main modular machine is stopped, the fan in the main modular machine continues to operate, and the compressor in the first slave module machine is controlled to be powered on to cause the first slave module mechanism to operate thermally, and in the Obtaining a cumulative frosting time of the first slave module machine after the first slave module mechanism is hot running;

C2, when the accumulated frosting time of the first slave module machine reaches a fourth time threshold or the inlet temperature change rate ΔT3b of any one of the first slave module machines is greater than or equal to the first preset When the value is controlled, the compressor in the first slave module machine is stopped, the fan in the first slave module machine continues to run, and the process returns to step a2.

And, when the accumulated frosting time of the main modular machine does not reach the third time threshold, and the inlet temperature change rate ΔT3a of each of the air conditioning heat exchangers in the main modular machine is smaller than the first preset value The control module controls the main module machine to continue heating operation. When the accumulated frosting time of the first slave module machine does not reach the fourth time threshold and the inlet temperature change rate ΔT3b of each air conditioner heat exchanger in the first slave module machine is smaller than the first pre- When the value is set, the control module controls the first slave module machine to continue the heating operation.

In summary, in the embodiment of the present invention, when the air-cooled heat pump cold and hot water unit is operated in the rotation defrosting mode, the switching between the control module machines is alternated between the main module machine and the first slave module machine, for example. Switching, using the continuous operation of the fan itself, the frost on the corresponding air conditioner heat exchanger absorbs the heat of the surrounding environment, thereby reducing the heating attenuation during the heating and defrosting, greatly improving the heating effect and improving the user experience.

According to the air-cooled heat pump water chiller unit according to the embodiment of the present invention, when operating in the rotation defrosting mode, the control module controls at least one of the N modular machines to be turned on, and maintains at least one of the N modular machines In the shutdown state, then according to the inlet temperature change rate ΔT3a of each air conditioner heat exchanger corresponding to any modular machine that is turned on, and the inlet temperature change rate of each air conditioner heat exchanger corresponding to any modular machine in the shutdown state △ T3b controls any module machine that is turned on to alternately operate with any module machine in the shutdown state, and keeps the fan in any module machine that is turned on and the fan in any module machine that is in the shutdown state continue to run. Defrost by forced convection heat transfer through a fan, ie through The switching between the module machines uses the continuous operation of the fan to perform defrosting, thereby eliminating the need to convert the cooling operation and stopping the fan to perform defrosting, reducing the heating attenuation during the heating and defrosting, greatly improving the heating effect and improving user experience.

According to a third embodiment of the present invention, the air-cooled heat pump cold and hot water unit comprises: N module machines 100, a first temperature detecting module, a first pressure detecting module and a control module, and N is an integer greater than or equal to 2.

Wherein, as shown in FIG. 1 , the outlet pipes of each modular machine 100 are respectively connected to the total outlet pipes of the air-cooled heat pump hot and cold water units, and the inlet pipes of each modular machine 100 are respectively connected to the air-cooled heat pump hot and cold water. The total inlet pipe of the unit is used to realize the parallel connection of N modular machines 100.

And, as shown in FIG. 2, each modular machine 100 may include a plurality of hot water heating systems such as two (a first hot water system and a second hot water system), each of which includes a compressor and An air conditioner heat exchanger in which an air conditioner heat exchanger in each of the hot water systems, for example, an air conditioner heat exchanger in the first hot water system and an air conditioner heat exchanger in the second hot water system share a fan and share The same water side heat exchanger.

Specifically, as shown in FIG. 2, the first hot water system includes a compressor 11, an exhaust temperature switch 12, a high pressure switch 13, a four-way valve 14, a low pressure switch 15, a low pressure irrigation 16, and a first air conditioning heat exchanger. 17. An electronic expansion valve 18, the second hot water system comprising a compressor 21, an exhaust temperature switch 22, a high pressure switch 23, a four-way valve 24, a low pressure switch 25, a low pressure irrigation 26, a second air conditioning heat exchanger 27, electronics Expansion valve 28. Moreover, the first air conditioning heat exchanger 17 and the second air conditioning heat exchanger 27 share a single fan 10, and the first hot water system and the second hot water system also share a water side heat exchanger, that is, a casing heat exchanger 20, At the same time, a temperature sensor is arranged at the outlet pipe of the casing heat exchanger 20 and the inlet pipe (for example, a temperature sensor 101 is provided at the inlet pipe to detect the inlet water temperature), a flow sensor is arranged at the outlet pipe, and the air conditioner is exchanged. A temperature sensor 19 is provided between the heat exchanger 17 and the electronic expansion valve 18, and a temperature sensor 29 is provided between the air conditioner heat exchanger 27 and the electronic expansion valve 28.

In an embodiment of the invention, the first temperature detecting module, such as an outdoor temperature sensor, is used to detect the outdoor ambient temperature T4 in real time, and the first pressure detecting module (a pressure sensor disposed at each compressor return port, such as a low pressure switch) is used for Real-time detecting the low-pressure side pressure of each compressor in each of the modular machines, and the control module is configured to obtain the low-pressure side pressure change rate ΔP of each compressor according to the low-pressure side pressure of each compressor detected in real time, and The air-cooling heat pump hot and cold water unit determines the outdoor ambient temperature T4 when entering the defrosting mode, wherein if the outdoor ambient temperature T4 is greater than the first preset temperature, the control module is based on each compressor The low pressure side pressure change rate ΔP controls the air-cooled heat pump cold and hot water unit to operate in a rotating defrosting mode.

According to an embodiment of the present invention, when the air-cooled heat pump cold and hot water unit is operated in a rolling defrosting mode, the control module controls at least one of the N modular machines to be turned on, and maintains the N At least one of the modular machines is in a stop state, and each of the compressors corresponding to the low pressure side pressure change rate ΔPa of each compressor corresponding to any of the open modular machines and each of the modular machines in the stopped state The low pressure side pressure change rate ΔPb controls any one of the modular machines that are turned on to alternately heat the operation with any of the modular machines in the stopped state, and maintains any mode of the opening. The fan in the block machine and the fan in any of the modular machines in the stop state continue to operate to defrost by forced convection heat transfer of the fan.

Further, when the air-cooled heat pump hot and cold water unit enters the defrosting mode, if the outdoor ambient temperature T4 is less than or equal to the first preset temperature, the control module controls the air-cooled heat pump to be hot and cold The water unit operates in a conventional defrost mode.

Among them, it should be noted that the first preset temperature can be calibrated according to the specific conditions of the air-cooled heat pump hot and cold water unit. Moreover, the conventional defrosting method refers to the chilling of the air-cooled heat pump hot and cold water unit or the normal cooling operation and the stopping fan. That is to say, when the outdoor ambient temperature T4 is relatively low, the air-cooled heat pump hot and cold water unit still passes the normal state. Cooling operation and fan stop for defrosting. The air-cooled heat pump water chiller unit operates in a rotating defrosting mode, that is, a defrosting between the module machines, only for a specific outdoor ambient temperature.

Specifically, according to an embodiment of the present invention, when the operating parameters of each of the modular machines include the low side pressure of each of the compressors in each of the modular machines, the control module is further The low pressure side pressure acquires the low pressure side pressure change rate ΔP of each compressor to correspond to the low pressure side pressure change rate ΔPa of each compressor corresponding to any of the open modular machines and any modular machine in the stop state. The pressure change rate ΔPb of the low-pressure side of each compressor controls the alternate heating operation of any one of the modular machines that are turned on and the one of the modular machines that are in the stopped state, and keeps the fan in the module machine that is turned on and is in the stop state. The fan in any of the modular machines is continuously operated to defrost by forced convection heat transfer of the fan. Wherein, when any of the module machines that are turned on is the main module machine, and any of the module machines that are in the shutdown state is the first slave module machine, the control module controls the main module machine and the first An alternate heating operation from the modular machine:

A3, controlling the compressor in the main module machine to be powered on to enable the main module mechanism to run hot, and acquiring the accumulated frosting time of the main module machine after the main module mechanism is hot running;

B3, when the cumulative frosting time of the main modular machine reaches a fifth time threshold or the low pressure side pressure change rate ΔPa of any of the main modular machines is greater than or equal to a second preset value, controlling the main The compressor in the modular machine is stopped, the fan in the main modular machine continues to operate, and the compressor in the first slave module machine is controlled to be powered on to cause the first slave module mechanism to operate thermally, and in the Obtaining a cumulative frosting time of the first slave module machine after a thermal operation of the module mechanism;

C3, when the accumulated frosting time of the first slave module machine reaches a sixth time threshold or the low pressure side pressure change rate ΔPb of any one of the first slave module machines is greater than or equal to the second preset value At the same time, the compressor in the first slave module machine is controlled to stop, the fan in the first slave module machine continues to run, and returns to step a3.

And, when the accumulated frosting time of the main modular machine does not reach the fifth time threshold and the low pressure side pressure change rate ΔPa of each compressor in the main modular machine is less than the second preset value The control module controls the main module machine to continue heating operation. When the cumulative frosting time of the first slave module machine does not reach the sixth time threshold and the The control module controls the first slave module machine to continue the heating operation when the low pressure side pressure change rate ΔPb of each compressor in the first slave module machine is less than the second preset value.

In summary, in the embodiment of the present invention, when the air-cooled heat pump cold and hot water unit is operated in the rotation defrosting mode, the switching between the control module machines is alternated between the main module machine and the first slave module machine, for example. Switching, using the continuous operation of the fan itself, the frost on the corresponding air conditioner heat exchanger absorbs the heat of the surrounding environment, thereby reducing the heating attenuation during the heating and defrosting, greatly improving the heating effect and improving the user experience.

According to the air-cooled heat pump water chiller unit according to the embodiment of the present invention, when operating in the rotation defrosting mode, the control module controls at least one of the N modular machines to be turned on, and maintains at least one of the N modular machines It is in the stop state, and then according to the low pressure side pressure change rate ΔPa of each compressor corresponding to any modular machine that is turned on, and the low pressure side pressure change rate ΔPb of each compressor corresponding to any modular machine in the stop state. Any one of the module machines that are turned on alternates with the heating of any module machine in the shutdown state, and keeps the fan in any of the module machines that are turned on and the fan in any module machine that is in the shutdown state continuously run to pass The forced convection heat transfer of the fan is defrosted, that is, by switching between the modular machines, the defrosting is performed by the continuous operation of the fan itself, thereby eliminating defrosting by converting the cooling operation and stopping the fan, and reducing the heating defrosting time. The heating attenuation greatly improves the heating effect and improves the user experience.

According to a fourth embodiment of the present invention, the air-cooled heat pump cold and hot water unit comprises: N module machines 100, a first temperature detecting module, a second temperature detecting module, a third temperature detecting module and a control module, wherein N is greater than or equal to An integer of 2.

Wherein, as shown in FIG. 1 , the outlet pipes of each modular machine 100 are respectively connected to the total outlet pipes of the air-cooled heat pump hot and cold water units, and the inlet pipes of each modular machine 100 are respectively connected to the air-cooled heat pump hot and cold water. The total inlet pipe of the unit is used to realize the parallel connection of N modular machines 100.

And, as shown in FIG. 2, each modular machine 100 may include a plurality of hot water heating systems such as two (a first hot water system and a second hot water system), wherein the first hot water system The air conditioner heat exchanger and the air conditioner heat exchanger in the second hot water system share one fan and share the same water side heat exchanger.

Specifically, as shown in FIG. 2, the first hot water system includes a compressor 11, an exhaust temperature switch 12, a high pressure switch 13, a four-way valve 14, a low pressure switch 15, a low pressure irrigation 16, and an air conditioning heat exchanger 17, The electronic expansion valve 18, the second hot water system also includes a compressor 21, an exhaust temperature switch 22, a high pressure switch 23, a four-way valve 24, a low pressure switch 25, a low pressure irrigation 26, an air conditioning heat exchanger 27, and an electronic expansion valve 28. . Moreover, the air conditioning heat exchanger 17 in the first hot water system and the air conditioning heat exchanger 27 in the second hot water system share a single fan 10, and the first hot water system and the second hot water system also share water. The side heat exchanger is the casing heat exchanger 20, and at the same time, a temperature sensor is arranged at the outlet pipe and the inlet pipe of the casing heat exchanger 20, a flow sensor is arranged at the outlet pipe, and the air conditioning heat exchanger 17 is A temperature sensor 19 is provided between the electronic expansion valves 18, and a temperature sensor 29 is provided between the air conditioning heat exchanger 27 and the electronic expansion valve 28.

In an embodiment of the invention, the first temperature detecting module, such as an outdoor temperature sensor, is used to detect the outdoor ambient temperature T4 in real time, and the second temperature detecting module (such as the temperature sensor 101 disposed at the inlet pipe of each modular machine) is used for real The water temperature corresponding to each module machine is detected, and the third temperature detecting module (for example, a temperature sensor disposed at the outlet pipe of each module machine) is used to detect the water temperature corresponding to each module machine in real time, and the control module is used according to Real-time detection of the influent water temperature and the effluent water temperature to obtain the temperature difference between the inlet and outlet water of each of the modular machines, and determining the outdoor ambient temperature T4 when the air-cooled heat pump hot and cold water unit enters the defrosting mode, wherein if The outdoor ambient temperature T4 is greater than the first preset temperature, and the control module controls the air-cooled heat pump cold and hot water unit to operate in a rotating defrosting mode according to the temperature difference between the inlet and outlet water.

According to an embodiment of the present invention, when the air-cooled heat pump cold and hot water unit is operated in a rolling defrosting mode, the control module controls at least one of the N modular machines to be turned on, and maintains the N At least one of the module machines is in a shutdown state, and according to the temperature difference between the inlet and outlet water corresponding to any module machine that is turned on, and the temperature difference between the inlet and outlet water corresponding to any module machine in the shutdown state, any modular machine that is turned on is controlled and Any modular machine in the shutdown state alternates heating operation, and keeps the fan in any module machine that is turned on and the fan in any module machine in the shutdown state continue to operate to defoam by forced convection heat transfer of the fan. .

Further, when the air-cooled heat pump hot and cold water unit enters the defrosting mode, if the outdoor ambient temperature T4 is less than or equal to the first preset temperature, the control module controls the air-cooled heat pump to be hot and cold The water unit operates in a conventional defrost mode.

Among them, it should be noted that the first preset temperature can be calibrated according to the specific conditions of the air-cooled heat pump hot and cold water unit. Moreover, the conventional defrosting method refers to the chilling of the air-cooled heat pump hot and cold water unit or the normal cooling operation and the stopping fan. That is to say, when the outdoor ambient temperature T4 is relatively low, the air-cooled heat pump hot and cold water unit still passes the normal state. Cooling operation and fan stop for defrosting. The air-cooled heat pump water chiller unit operates in a rotating defrosting mode, that is, a defrosting between the module machines, only for a specific outdoor ambient temperature.

Specifically, according to an embodiment of the present invention, when the operating parameters of each of the modular machines include an influent water temperature Tin corresponding to each of the modular machines and an outlet water temperature Tout corresponding to each of the modular machines, The control module further obtains the temperature difference between the inlet and outlet water of each of the modular machines according to the inlet water temperature Tin corresponding to each of the modular machines and the outlet water temperature Tout corresponding to each of the modular machines, so as to correspond to any modular machine that is turned on. The temperature difference between the inlet and outlet water and the temperature difference between the inlet and outlet water of any module machine in the stop state control alternately heats any module machine that is turned on and any module machine that is in the shutdown state, and maintains the module machine in the open state The fan and the fan in any of the modular machines in the shutdown state continue to operate to defrost the forced convection heat transfer of the fan. Wherein, when any of the module machines that are turned on is the main module machine, and any of the module machines that are in the shutdown state is the first slave module machine, the control module controls the main module machine and the first An alternate heating operation from the modular machine:

A4, controlling the compressor in the main module machine to be powered on to enable the main module mechanism to run hot, and obtaining the temperature difference between the inlet and outlet water of the main module machine after the main module mechanism is hot for a fifth preset time The initial temperature difference between the inlet and outlet water, and the cumulative frosting time of the main module machine;

B4, when the accumulated frosting time of the main module machine reaches a seventh time threshold or the temperature difference between the inlet and outlet water of the main module machine is less than the first preset temperature difference, controlling the compressor in the main module machine to stop, The fan in the main module machine continues to operate, and controls the compressor in the first slave module machine to be powered on to cause the first slave module mechanism to operate thermally, wherein the first preset temperature difference is according to the first entry and exit. The initial temperature difference of water is calculated;

C4. After the fifth slave module mechanism is hot to run the fifth preset time, obtain the temperature difference between the inlet and outlet water of the first slave module machine as the initial temperature difference between the second inlet and outlet water, and acquire the first slave module machine. Cumulative frosting time;

D4. When the accumulated frosting time of the first slave module machine reaches an eighth time threshold or the temperature difference between the inlet and outlet water of the first slave module machine is less than a second preset temperature difference, controlling the first slave module machine When the compressor is stopped, the fan of the first slave module machine continues to run, and returns to step a4, wherein the second preset temperature difference is calculated according to the initial temperature difference of the second inlet and outlet water.

And, when the accumulated frosting time of the main module machine does not reach the seventh time threshold and the temperature difference between the inlet and outlet of the main module machine is greater than or equal to the first preset temperature difference, the control module controls the main The modular machine continues to operate in heating. When the accumulated frosting time of the first slave module machine does not reach the eighth time threshold and the temperature difference between the inlet and outlet of the first slave module machine is greater than or equal to the second preset temperature difference, the control module controls the The first slave module machine continues to operate in heating.

In summary, in the embodiment of the present invention, when the air-cooled heat pump cold and hot water unit is operated in the rotation defrosting mode, the switching between the control module machines is alternated between the main module machine and the first slave module machine, for example. Switching, using the continuous operation of the fan itself, the frost on the corresponding air conditioner heat exchanger absorbs the heat of the surrounding environment, thereby reducing the heating attenuation during the heating and defrosting, greatly improving the heating effect and improving the user experience.

According to the air-cooled heat pump water chiller unit according to the embodiment of the present invention, when operating in the rotation defrosting mode, the control module controls at least one of the N modular machines to be turned on, and maintains at least one of the N modular machines In the stop state, then according to the temperature difference between the inlet and outlet water corresponding to any module machine that is turned on and the temperature difference between the inlet and outlet water corresponding to any module machine in the shutdown state, any module machine that is turned on is alternated with any module machine in the shutdown state. Run hot, and keep the fan in any module machine that is turned on and the fan in any module machine in the stop state continue to run, to defoam through the forced convection heat transfer of the fan, that is, through the switch between the module machines The defrosting is carried out by using the continuous operation of the fan itself, thereby eliminating defrosting by converting the cooling operation and stopping the fan, reducing the heating attenuation during the heating and defrosting, greatly improving the heating effect and improving the user experience.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " After, "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inside", "Outside", "Clockwise", "Counterclockwise", "Axial", The orientation or positional relationship of the "radial", "circumferential" and the like is based on the orientation or positional relationship shown in the drawings, and is merely for convenience of description of the present invention and simplified description, and does not indicate or imply the indicated device or component. It must be constructed and operated in a particular orientation, and is not to be construed as limiting the invention.

Moreover, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, features defining "first" or "second" may include at least one of the features, either explicitly or implicitly. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless specifically defined otherwise.

In the present invention, the terms "installation", "connected", "connected", "fixed" and the like shall be understood broadly, and may be either a fixed connection or a detachable connection, unless explicitly stated and defined otherwise. , or integrated; can be mechanical or electrical connection; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction of two elements, unless otherwise specified Limited. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.

In the present invention, the first feature "on" or "under" the second feature may be a direct contact of the first and second features, or the first and second features may be indirectly through an intermediate medium, unless otherwise explicitly stated and defined. contact. Moreover, the first feature "above", "above" and "above" the second feature may be that the first feature is directly above or above the second feature, or merely that the first feature level is higher than the second feature. The first feature "below", "below" and "below" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely that the first feature level is less than the second feature.

In the description of the present specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like means a specific feature described in connection with the embodiment or example. A structure, material or feature is included in at least one embodiment or example of the invention. In the present specification, the schematic representation of the above terms is not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, various embodiments or examples described in the specification, as well as features of various embodiments or examples, may be combined and combined.

Although the embodiments of the present invention have been shown and described, it is understood that the above-described embodiments are illustrative and are not to be construed as limiting the scope of the invention. The embodiments are subject to variations, modifications, substitutions and variations.

Claims (36)

The invention relates to a defrosting control method for an air-cooled heat pump cold and hot water unit, characterized in that the air-cooling heat pump cold and hot water unit comprises N modular machines, N is an integer greater than or equal to 2, and each of the modular machines is out The water pipes are respectively connected to the total outlet pipes of the air-cooled heat pump cold and hot water unit, and the inlet pipes of each of the modular machines are respectively connected to the total inlet pipes of the air-cooled heat pump cold and hot water units to realize the N modular machines are connected in parallel, each of the modular machines includes a plurality of hot water systems, each of the hot water systems includes a compressor and an air conditioner heat exchanger, and the defrosting control method comprises the following steps: Real-time detection of the outdoor ambient temperature T4, and obtaining operating parameters of each of the modular machines; When the air-cooling heat pump cold and hot water unit enters the defrosting mode, determining whether to control the air-cooling heat pump cold and hot water unit to operate in a rotating defrosting mode according to the outdoor ambient temperature T4; If the air-cooled heat pump cold and hot water unit operates in a rolling defrosting mode, at least one of the N modular machines is controlled to be turned on, and at least one of the N modular machines is kept in a shutdown state; as well as Controlling, according to the outdoor ambient temperature T4 and the operating parameters of any module machine that is turned on, alternately heating the module machine that is turned on and any module machine that is in the shutdown state, and maintaining the module in the open The fan and the fan in any of the modular machines in the shutdown state continue to operate to defrost the forced convection heat transfer of the fan. The defrosting control method for an air-cooled heat pump water chiller unit according to claim 1, wherein when the air-cooling heat pump cold and hot water unit enters a defrosting mode, wherein If the outdoor ambient temperature T4 is greater than the first preset temperature, controlling the air-cooled heat pump cold and hot water unit to operate in a rotating defrosting mode; If the outdoor ambient temperature T4 is less than or equal to the first preset temperature, the air-cooled heat pump hot and cold water unit is controlled to operate in a conventional defrosting mode. The defrosting control method for an air-cooled heat pump water chiller unit according to claim 1 or 2, wherein the operating parameters of each of the module machines include a water inlet temperature Tin and a corresponding water volume of each of the module machines. The outlet water temperature Tout corresponding to the modular machine, the inlet temperature T3 of each of the air conditioner heat exchangers in each of the modular machines, and the low pressure side pressure of each compressor in each of the modular machines. The defrosting control method for an air-cooled heat pump water chiller unit according to claim 3, wherein when the operating parameter of each of the module machines includes the inlet water temperature Tin corresponding to each of the module machines, Any module machine that is turned on is the main module machine, and any module machine in the shutdown state is the first slave module machine, and the opening is controlled according to the outdoor ambient temperature T4 and the inlet water temperature Tin of any modular machine that is turned on. The alternate heating operation of any modular machine and any modular machine in the shutdown state specifically includes: A1, controlling the compressor in the main module machine to be turned on to enable the main module mechanism to operate hot, and determining the outdoor ambient temperature T4 and the location after the main module machine performs heating operation for a first preset time The inlet water temperature of the main module machine Whether Tin meets the first preset condition; B1, if it is determined that the outdoor ambient temperature T4 and the inlet water temperature Tin of the main modular machine meet the first preset condition, controlling the main modular machine to enter a frost accumulation mode, and acquiring the main modular machine Cumulative frosting time; C1, when the accumulated frosting time of the main modular machine reaches a first time threshold, controlling the compressor in the main modular machine to stop, the fan in the main modular machine continues to operate, and controlling the first slave The compressor in the modular machine is powered on to cause the first slave module mechanism to operate thermally, and after the first slave module machine performs a heating operation for a second predetermined time, determining the outdoor ambient temperature T4 and the first Whether the inlet water temperature Tin of the slave module meets the second preset condition; D1, if it is determined that the outdoor ambient temperature T4 and the inlet water temperature Tin of the first slave module machine meet the second preset condition, controlling the first slave module machine to enter a frost accumulation mode, and acquiring The cumulative frosting time of the first slave module machine; E1, when the accumulated frosting time of the first slave module machine reaches a second time threshold, controlling the compressor in the first slave module machine to stop, the fan in the first slave module machine continues to run, and Go back to step a1. The defrosting control method for the air-cooled heat pump water chiller unit according to claim 4, wherein in step a1, if it is determined that the outdoor ambient temperature T4 and the inlet water temperature Tin of the main module machine are not satisfied After the first preset condition is controlled, the main module system continues to control the heating operation for a third preset time, and returns to continue to determine whether the outdoor ambient temperature T4 and the inlet water temperature Tin of the main module machine meet the requirements. The first preset condition is described. The defrosting control method for an air-cooled heat pump water chiller unit according to claim 4, wherein in step c1, if the outdoor ambient temperature T4 and the inlet water temperature of the first slave module machine are determined If the second preset condition is not met, the first slave module machine is controlled to continue the heating operation for a fourth preset time, and then returns to continue to determine the outdoor ambient temperature T4 and the water of the first slave module machine. Whether the water temperature Tin satisfies the second preset condition. A defrosting control method for an air-cooled heat pump water chiller unit according to claim 3, wherein an operation parameter of each of said module machines includes an inlet of each of said air conditioner heat exchangers in said module machine At temperature T3, the inlet temperature change rate ΔT3 of each air conditioner heat exchanger is also obtained according to the inlet temperature T3 of each air conditioner heat exchanger, according to the inlet temperature of each air conditioner heat exchanger corresponding to any modular machine that is turned on. The rate of change ΔT3a and the inlet temperature change rate ΔT3b of each air conditioner heat exchanger corresponding to any module machine in the stop state control the alternate heating operation of any of the module machines that are turned on and any module machine that is in the shutdown state, And keep the fan in any of the module machines that are turned on and the fan in any of the module machines in the stop state continue to operate to defrost by forced convection heat transfer of the fan. The defrosting control method for an air-cooled heat pump water chiller unit according to claim 7, wherein when any one of the module machines that are turned on is a main module machine, and any module machine that is in a shutdown state is a first slave module In the machine time, the inlet temperature change rate ΔT3a of each air conditioner heat exchanger corresponding to any modular machine that is turned on and the inlet temperature change rate of each air conditioner heat exchanger corresponding to any modular machine in the shutdown state △ T3b controls any module machine that is turned on and alternately performs heating operation of any module machine in the shutdown state, including: Controlling the compressor in the main module machine to be powered on to enable the main module mechanism to operate hot, and acquiring the accumulated frosting time of the main module machine after the main module mechanism is hot running; B2, when the cumulative frosting time of the main module machine reaches a third time threshold or the inlet temperature change rate ΔT3a of any one of the main module machines is greater than or equal to a first preset value, The compressor in the main modular machine is stopped, the fan in the main modular machine continues to operate, and the compressor in the first slave module machine is controlled to be powered on to cause the first slave module mechanism to operate thermally, and in the Obtaining a cumulative frosting time of the first slave module machine after the first slave module mechanism is hot running; C2, when the accumulated frosting time of the first slave module machine reaches a fourth time threshold or the inlet temperature change rate ΔT3b of any one of the first slave module machines is greater than or equal to the first preset When the value is controlled, the compressor in the first slave module machine is stopped, the fan in the first slave module machine continues to run, and the process returns to step a2. The defrosting control method for an air-cooled heat pump water chiller unit according to claim 8, wherein the inlet temperature change rate ΔT3a of each air conditioner heat exchanger corresponding to any of the turned on modules is The inlet temperature change rate of each air conditioner heat exchanger corresponding to any module machine in the shutdown state ΔT3b controls the alternate heating operation of any module machine that is turned on and any module machine that is in the shutdown state, and specifically includes: When the accumulated frosting time of the main modular machine does not reach the third time threshold and the inlet temperature change rate ΔT3a of each of the air conditioning heat exchangers in the main module machine is less than the first preset value, Controlling the main module machine to continue heating operation. The defrosting control method for an air-cooled heat pump water chiller unit according to claim 8, wherein the inlet temperature change rate ΔT3a of each air conditioner heat exchanger corresponding to any of the turned on modules is The inlet temperature change rate of each air conditioner heat exchanger corresponding to any module machine in the shutdown state ΔT3b controls the alternate heating operation of any module machine that is turned on and any module machine that is in the shutdown state, and specifically includes: When the accumulated frosting time of the first slave module machine does not reach the fourth time threshold and the inlet temperature change rate ΔT3b of each air conditioner heat exchanger in the first slave module machine is smaller than the first pre- When the value is set, the first slave module machine is controlled to continue the heating operation. A defrosting control method for an air-cooled heat pump water chiller unit according to claim 3, wherein an operating parameter of each of said modular machines includes a low pressure side pressure of each of said each of said modular machines At the same time, the low pressure side pressure change rate ΔP of each compressor is also obtained according to the low pressure side pressure of each compressor, so as to be based on the low pressure side pressure change rate ΔPa of each compressor corresponding to any modular machine that is turned on. The low-pressure side pressure change rate ΔPb of each compressor corresponding to any module machine in the stop state controls whether any of the open modular machines and any modular machine in the stopped state alternately perform heating operation, and maintain any of the open The fan in the modular machine and the fan in any of the modular machines in the shutdown state continue to operate to defrose by forced convection heat transfer of the fan. A defrosting control method for an air-cooled heat pump water chiller unit according to claim 11, wherein when When any module machine of the startup module is the main module machine and any module machine in the shutdown state is the first slave module machine, the pressure change rate ΔPa of the low pressure side of each compressor corresponding to any module machine that is turned on is ΔPa The low-pressure side pressure change rate ΔPb of each compressor corresponding to any modular machine in the stopped state controls the alternate heating operation of any of the modular machines that are turned on and any modular machine that is in the stopped state, and specifically includes: A3, controlling the compressor in the main module machine to be powered on to enable the main module mechanism to run hot, and acquiring the accumulated frosting time of the main module machine after the main module mechanism is hot running; B3, when the cumulative frosting time of the main modular machine reaches a fifth time threshold or the low pressure side pressure change rate ΔPa of any of the main modular machines is greater than or equal to a second preset value, controlling the main The compressor in the modular machine is stopped, the fan in the main modular machine continues to operate, and the compressor in the first slave module machine is controlled to be powered on to cause the first slave module mechanism to operate thermally, and in the Obtaining a cumulative frosting time of the first slave module machine after a thermal operation of the module mechanism; C3, when the accumulated frosting time of the first slave module machine reaches a sixth time threshold or the low pressure side pressure change rate ΔPb of any one of the first slave module machines is greater than or equal to the second preset value At the same time, the compressor in the first slave module machine is controlled to stop, the fan in the first slave module machine continues to run, and returns to step a3. A defrosting control method for an air-cooled heat pump water chiller unit according to claim 12, wherein said low pressure side pressure change rate ΔPa of each compressor corresponding to any of the modular machines that are turned on is in a shutdown The low-pressure side pressure change rate ΔPb of each compressor corresponding to any modular machine in the state controls the alternate heating operation of any of the modular machines that are turned on and any modular machine that is in the shutdown state, and specifically includes: When the accumulated frosting time of the main modular machine does not reach the fifth time threshold and the low pressure side pressure change rate ΔPa of each compressor in the main modular machine is less than the second preset value, the control The main modular machine continues to operate in heating. A defrosting control method for an air-cooled heat pump water chiller unit according to claim 12, wherein said low pressure side pressure change rate ΔPa of each compressor corresponding to any of the modular machines that are turned on is in a shutdown The low-pressure side pressure change rate ΔPb of each compressor corresponding to any modular machine in the state controls the alternate heating operation of any of the modular machines that are turned on and any modular machine that is in the shutdown state, and specifically includes: When the accumulated frosting time of the first slave module machine does not reach the sixth time threshold and the low pressure side pressure change rate ΔPb of each compressor in the first slave module machine is smaller than the second preset At the time of the value, the first slave module machine is controlled to continue the heating operation. A defrosting control method for an air-cooled heat pump water chiller unit according to claim 3, wherein when the operating parameters of each of the modular machines include the inlet water temperature Tin and each of the module machines When the water temperature Tout corresponding to the module machine is used, the temperature difference between the inlet and outlet water of each module machine is obtained according to the inlet water temperature Tin corresponding to each of the module machines and the outlet water temperature Tout corresponding to each of the module machines, According to the temperature difference between the inlet and outlet water corresponding to any module machine that is turned on, and the temperature difference between the inlet and outlet water corresponding to any module machine in the shutdown state, any modular machine that is turned on is controlled to be in a shutdown state. Any modular machine of the state alternately performs heating operation, and keeps the fan in any of the module machines that are turned on and the fan in any module machine in the stopped state continue to operate, thereby performing defrosting by forced convection heat transfer of the fan. The defrosting control method for an air-cooled heat pump water chiller unit according to claim 15, wherein when any one of the module machines that are turned on is a main module machine, and any module machine that is in a stopped state is a first slave module When the machine is in operation, the temperature difference between the inlet and outlet water corresponding to any module machine that is turned on and the temperature difference between the inlet and outlet water corresponding to any module machine in the shutdown state control alternately any module machine that is turned on and any module machine that is in the shutdown state The hot run specifically includes: A4, controlling the compressor in the main module machine to be powered on to enable the main module mechanism to run hot, and obtaining the temperature difference between the inlet and outlet water of the main module machine after the main module mechanism is hot for a fifth preset time The initial temperature difference between the inlet and outlet water, and the cumulative frosting time of the main module machine; B4, when the accumulated frosting time of the main module machine reaches a seventh time threshold or the temperature difference between the inlet and outlet water of the main module machine is less than the first preset temperature difference, controlling the compressor in the main module machine to stop, The fan in the main module machine continues to operate, and controls the compressor in the first slave module machine to be powered on to cause the first slave module mechanism to operate thermally, wherein the first preset temperature difference is according to the first entry and exit. The initial temperature difference of water is calculated; C4. After the fifth slave module mechanism is hot to run the fifth preset time, obtain the temperature difference between the inlet and outlet water of the first slave module machine as the initial temperature difference between the second inlet and outlet water, and acquire the first slave module machine. Cumulative frosting time; D4. When the accumulated frosting time of the first slave module machine reaches an eighth time threshold or the temperature difference between the inlet and outlet water of the first slave module machine is less than a second preset temperature difference, controlling the first slave module machine When the compressor is stopped, the fan of the first slave module machine continues to run, and returns to step a4, wherein the second preset temperature difference is calculated according to the initial temperature difference of the second inlet and outlet water. The defrosting control method for an air-cooled heat pump water chiller unit according to claim 16, wherein the temperature difference between the inlet and outlet water corresponding to any module machine that is turned on is corresponding to the entry and exit of any module machine in the shutdown state. Water temperature difference control Any module machine that is turned on alternately with any module machine in the shutdown state specifically includes: Controlling the main module machine to continue heating operation when the accumulated frosting time of the main module machine does not reach the seventh time threshold and the temperature difference between the inlet and outlet water of the main module machine is greater than or equal to the first preset temperature difference . The defrosting control method for an air-cooled heat pump water chiller unit according to claim 16, wherein the temperature difference between the inlet and outlet water corresponding to any module machine that is turned on is corresponding to the entry and exit of any module machine in the shutdown state. Water temperature difference control Any module machine that is turned on alternately with any module machine in the shutdown state specifically includes: Controlling the first slave when the accumulated frosting time of the first slave module machine does not reach the eighth time threshold and the temperature difference between the inlet and outlet water of the first slave module machine is greater than or equal to the second preset temperature difference The modular machine continues to operate in heating. An air-cooled heat pump water chiller unit characterized by comprising: N modular machines, the outlet pipes of each of the modular machines are respectively connected to the total outlet pipes of the air-cooled heat pump cold and hot water unit, and the inlet pipes of each of the modular machines are respectively connected to the air-cooled heat pump The total inlet pipe of the hot and cold water unit is realized The N module machines are connected in parallel, wherein N is an integer greater than or equal to 2; a first temperature detecting module for detecting an outdoor ambient temperature T4 in real time; Obtaining a module, configured to acquire an operating parameter of each of the module machines; a control module, configured to determine, according to the outdoor ambient temperature T4, whether to control the air-cooled heat pump cold and hot water unit to operate in a rotating defrosting mode when the air-cooling heat pump cold and hot water unit enters a defrosting mode, wherein The air-cooling heat pump cold and hot water unit operates in a rolling defrosting mode, and the control module controls at least one of the N modular machines to be turned on, and keeps at least one of the N modular machines in a shutdown a state, and controlling, according to the outdoor ambient temperature T4 and an operating parameter of any module machine that is turned on, alternately heating any one of the module machines that are turned on and any module machine that is in a stopped state, and maintaining any module that is turned on The fan in the machine and the fan in any of the modular machines in the shutdown state continue to operate to defrose by forced convection heat transfer of the fan. The air-cooled heat pump water chiller unit according to claim 19, wherein when the air-cooling heat pump cold and hot water unit enters a defrosting mode, wherein If the outdoor ambient temperature T4 is greater than the first preset temperature, the control module controls the air-cooled heat pump hot and cold water unit to operate in a rotating defrosting mode; If the outdoor ambient temperature T4 is less than or equal to the first preset temperature, the control module controls the air-cooled heat pump hot and cold water unit to operate in a conventional defrosting mode. The air-cooled heat pump water chiller unit according to claim 19 or 20, wherein the operating parameters of each of the module machines include a water inlet temperature Tin corresponding to each of the module machines, and each of the module machines Corresponding effluent water temperature Tout, inlet temperature T3 of each air conditioner heat exchanger in each of the modular machines, and low pressure side pressure of each compressor in each of the modular machines. The air-cooled heat pump water chiller unit according to claim 21, wherein when the operating parameter of each of the modular machines includes the inlet water temperature Tin corresponding to each of the module machines, if the opening water is any The module machine is the main module machine, and any module machine in the shutdown state is the first slave module machine. The control module controls the alternate heating operation of the main module machine and the first slave module machine by the following control flow: A1, controlling the compressor in the main module machine to be turned on to enable the main module mechanism to operate hot, and determining the outdoor ambient temperature T4 and the location after the main module machine performs heating operation for a first preset time Whether the inlet water temperature Tin of the main module machine satisfies the first preset condition; B1, if it is determined that the outdoor ambient temperature T4 and the inlet water temperature Tin of the main modular machine meet the first preset condition, controlling the main modular machine to enter a frost accumulation mode, and acquiring the main modular machine Cumulative frosting time; C1, when the accumulated frosting time of the main modular machine reaches a first time threshold, controlling the compressor in the main modular machine to stop, the fan in the main modular machine continues to operate, and controlling the first slave The compressor in the modular machine is powered on to cause the first slave module mechanism to operate thermally, and after the first slave module machine performs a heating operation for a second predetermined time, Determining whether the outdoor ambient temperature T4 and the inlet water temperature Tin of the first slave module machine satisfy a second preset condition; D1, if it is determined that the outdoor ambient temperature T4 and the inlet water temperature Tin of the first slave module machine meet the second preset condition, controlling the first slave module machine to enter a frost accumulation mode, and acquiring The cumulative frosting time of the first slave module machine; E1, when the accumulated frosting time of the first slave module machine reaches a second time threshold, controlling the compressor in the first slave module machine to stop, the fan in the first slave module machine continues to run, and Go back to step a1. The air-cooled heat pump water chiller unit according to claim 22, wherein if it is determined that the outdoor ambient temperature T4 and the inlet water temperature Tin of the main modular machine do not satisfy the first preset condition, The control module controls the main module system to continue the heating operation for a third preset time, and returns to continue to determine whether the outdoor ambient temperature T4 and the inlet water temperature Tin of the main module machine meet the first preset condition. . The air-cooled heat pump water chiller unit according to claim 22, wherein if it is determined that the outdoor ambient temperature T4 and the inlet water temperature Tin of the first slave module machine do not satisfy the second preset condition, The control module controls the first slave module machine to continue the heating operation for a fourth preset time, and returns to continue to determine whether the outdoor ambient temperature T4 and the inlet water temperature Tin of the first slave module machine meet the The second preset condition. The air-cooled heat pump water chiller unit according to claim 21, wherein when the operating parameter of each of said modular machines includes an inlet temperature T3 of each of said air conditioner heat exchangers, The control module also obtains the inlet temperature change rate ΔT3 of each air conditioner heat exchanger according to the inlet temperature T3 of each air conditioner heat exchanger, so as to change the inlet temperature of each air conditioner heat exchanger corresponding to any modular machine that is turned on. Rate ΔT3a and the inlet temperature change rate ΔT3b of each air conditioner heat exchanger corresponding to any modular machine in the stop state, and control any one of the open modular machines and any modular machine in the stop state to alternately heat operation, and The fan in any of the modular machines that are turned on is continuously operated with the fan in any of the modular machines in the stopped state to be defrosted by forced convection heat transfer of the fan. The air-cooled heat pump water chiller unit according to claim 25, wherein when any one of the module machines that are turned on is the main module machine and any of the module machines that are in the shutdown state is the first slave module machine, The control module controls the alternate heating operation of the main module machine and the first slave module machine by the following control flow: Controlling the compressor in the main module machine to be powered on to enable the main module mechanism to operate hot, and acquiring the accumulated frosting time of the main module machine after the main module mechanism is hot running; B2, when the cumulative frosting time of the main module machine reaches a third time threshold or the inlet temperature change rate ΔT3a of any one of the main module machines is greater than or equal to a first preset value, The compressor in the main modular machine is stopped, the fan in the main modular machine continues to operate, and the compressor in the first slave module machine is controlled to be powered on to cause the first slave module mechanism to operate thermally, and in the Obtaining a cumulative frosting time of the first slave module machine after the first slave module mechanism is hot running; C2, when the accumulated frosting time of the first slave module machine reaches a fourth time threshold or the first slave module machine When the inlet temperature change rate ΔT3b of any of the air conditioners is greater than or equal to the first preset value, the compressor in the first slave module machine is controlled to stop, and the fan in the first slave module machine continues to operate. And return to step a2. The air-cooled heat pump water chiller unit according to claim 26, wherein when the cumulative frosting time of the main module machine does not reach the third time threshold and each of the air conditioning heat exchangers in the main module machine When the inlet temperature change rate ΔT3a of the device is less than the first preset value, the control module controls the main module machine to continue the heating operation. The air-cooled heat pump water chiller unit according to claim 26, wherein when the cumulative frosting time of said first slave module machine does not reach said fourth time threshold and said first slave module machine When the inlet temperature change rate ΔT3b of the air conditioner heat exchangers is less than the first preset value, the control module controls the first slave module machine to continue the heating operation. The air-cooled heat pump water chiller unit according to claim 21, wherein said control is performed when an operating parameter of each of said modular machines includes a low pressure side pressure of each of said each of said modular machines The module also obtains the low pressure side pressure change rate ΔP of each compressor according to the low pressure side pressure of each compressor, according to the low pressure side pressure change rate ΔPa of each compressor corresponding to any modular machine that is turned on and is in the shutdown. The low-pressure side pressure change rate ΔPb of each compressor corresponding to any modular machine in the state controls whether any of the open modular machines and any modular machine in the stopped state alternately perform heating operation, and maintains any module that is turned on. The fan in the machine and the fan in any of the modular machines in the shutdown state continue to operate to defrose by forced convection heat transfer of the fan. The air-cooled heat pump water chiller unit according to claim 29, wherein when any one of the module machines that are turned on is the main module machine and any of the module machines that are in the shutdown state is the first slave module machine, The control module controls the alternate heating operation of the main module machine and the first slave module machine by the following control flow: A3, controlling the compressor in the main module machine to be powered on to enable the main module mechanism to run hot, and acquiring the accumulated frosting time of the main module machine after the main module mechanism is hot running; B3, when the cumulative frosting time of the main modular machine reaches a fifth time threshold or the low pressure side pressure change rate ΔPa of any of the main modular machines is greater than or equal to a second preset value, controlling the main The compressor in the modular machine is stopped, the fan in the main modular machine continues to operate, and the compressor in the first slave module machine is controlled to be powered on to cause the first slave module mechanism to operate thermally, and in the Obtaining a cumulative frosting time of the first slave module machine after a thermal operation of the module mechanism; C3, when the accumulated frosting time of the first slave module machine reaches a sixth time threshold or the low pressure side pressure change rate ΔPb of any one of the first slave module machines is greater than or equal to the second preset value At the same time, the compressor in the first slave module machine is controlled to stop, the fan in the first slave module machine continues to run, and returns to step a3. The air-cooled heat pump water chiller unit according to claim 30, wherein when the cumulative frosting time of said main module machine does not reach said fifth time threshold and each of said main modular machines When the low pressure side pressure change rate ΔPa is less than the second preset value, the control module controls the main module machine to continue the heating operation. The air-cooled heat pump water chiller unit according to claim 30, wherein when the cumulative frosting time of said first slave module machine does not reach said sixth time threshold and said first slave module machine The control module controls the first slave module machine to continue the heating operation when the low pressure side pressure change rate ΔPb of each compressor is less than the second preset value. The air-cooled heat pump water chiller unit according to claim 21, wherein the operating parameters of each of the modular machines include a water inlet temperature Tin corresponding to each of the module machines and a corresponding one of each of the module machines The control module further obtains the temperature difference between the inlet and outlet water of each of the modular machines according to the inlet water temperature Tin corresponding to each of the modular machines and the outlet water temperature Tout corresponding to each of the modular machines, according to the outlet water temperature Tout The temperature difference between the inlet and outlet water corresponding to any module machine that is turned on and the temperature difference between the inlet and outlet water corresponding to any module machine in the shutdown state control alternately heating operation of any of the module machines that are turned on and any module machine that is in the shutdown state, and maintain the The fan in any modular machine that is turned on and the fan in any of the modular machines that are in the shutdown state continue to operate to defrost by forced convection heat transfer of the fan. The air-cooled heat pump water chiller unit according to claim 33, wherein when any one of the module machines that are turned on is the main module machine and any of the module machines that are in the shutdown state is the first slave module machine, The control module controls the alternate heating operation of the main module machine and the first slave module machine by the following control flow: A4, controlling the compressor in the main module machine to be powered on to enable the main module mechanism to run hot, and obtaining the temperature difference between the inlet and outlet water of the main module machine after the main module mechanism is hot for a fifth preset time The initial temperature difference between the inlet and outlet water, and the cumulative frosting time of the main module machine; B4, when the accumulated frosting time of the main module machine reaches a seventh time threshold or the temperature difference between the inlet and outlet water of the main module machine is less than the first preset temperature difference, controlling the compressor in the main module machine to stop, The fan in the main module machine continues to operate, and controls the compressor in the first slave module machine to be powered on to cause the first slave module mechanism to operate thermally, wherein the first preset temperature difference is according to the first entry and exit. The initial temperature difference of water is calculated; C4. After the fifth slave module mechanism is hot to run the fifth preset time, obtain the temperature difference between the inlet and outlet water of the first slave module machine as the initial temperature difference between the second inlet and outlet water, and acquire the first slave module machine. Cumulative frosting time; D4. When the accumulated frosting time of the first slave module machine reaches an eighth time threshold or the temperature difference between the inlet and outlet water of the first slave module machine is less than a second preset temperature difference, controlling the first slave module machine When the compressor is stopped, the fan of the first slave module machine continues to run, and returns to step a4, wherein the second preset temperature difference is calculated according to the initial temperature difference of the second inlet and outlet water. The air-cooled heat pump water chiller unit according to claim 34, wherein when the cumulative frosting time of the main module machine does not reach the seventh time threshold and the temperature difference between the inlet and outlet of the main module machine is greater than or equal to The control module controls the main module machine to continue heating operation when the first preset temperature difference is reached. The air-cooled heat pump water chiller unit according to claim 34, wherein when the cumulative frosting time of the first slave module machine does not reach the eighth time threshold and the first slave module machine enters and exits When the water temperature difference is greater than or equal to the second preset temperature difference, the control module controls the first slave module machine to continue the heating operation.

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