WO2018137125A1 - High-efficiency energy-saving air-energy dual-machine heat pump air conditioning system - Google Patents

Abstract

A high-efficiency energy-saving air-energy dual-machine heat pump air conditioning system. An outlet of a first compressor (11), via ports d1 and b1 of a first two-position four-way valve (21) and a first check valve (31), and an outlet of a second compressor (12), via a second check valve (32), merge together and connect to a port c2 of a second two-position four-way valve (22). A port d2 of the second two-position four-way valve (22) connects to inlets of a first indoor condenser (51) and a second indoor condenser (52) separately. Outlets of the first and second indoor (51, 52) condensers pass through first, second and third expansion valves (61, 62, 63), and connect to an inlet of an evaporator (71). An outlet of the evaporator (71) passes through ports a2 and b2 of the second two-position four-way valve (22) and diverges into two routes: one route passing through ports c1 and a1 of the first two-position four-way valve (21) and a second liquid tank (42) and connecting to an inlet of the second compressor (12); and the other route passing through a first liquid tank (41) and connecting to an inlet of the first compressor (42). The invention is highly efficient, energy-saving, can be operated freely and is suitable for heating during winter in a cold region.

Description

Energy efficient air energy dual-machine heat pump air conditioning system Technical field

The present invention relates to a system for heating a house or a district using a heat pump, and more particularly to a heat pump air conditioning system utilizing air energy.

Background technique

At present, in cold or cold regions, most of the rural areas and small towns still use wood or coal as fuel for heating, poor comfort and environmental pollution, as well as the use of gas or electric heating. Due to shortage of natural gas resources, there are fewer users, and electric heating can be used. It is expensive. Although the air-energy heat pump air conditioner is technically mature, its heating function will be greatly attenuated in cold regions. When the ambient temperature is minus 5 degrees, it is necessary to start electric auxiliary heating. When the ambient temperature is minus 10 degrees, it is almost impossible to supply heat.

Summary of the invention

The technical problem to be solved by the invention is to provide a suitable cold/cold area for use in winter and summer, reliable work, high efficiency, energy saving, energy efficiency coefficient of 2.5 or more, low price, freely regulated according to needs, and utilizing air energy. Energy efficient air energy dual-machine heat pump air conditioning system.

The invention relates to a high-efficiency energy-saving air energy dual-machine heat pump air-conditioning system, comprising a compressor, a two-position four-way valve, an indoor condenser, an expansion valve, an outdoor evaporator and a liquid storage tank, the compressor, a two-position four-way valve, and indoor condensation There are two tanks and a liquid storage tank, and the expansion valve has three, and further includes two one-way valves, wherein the outlet of the first compressor is connected with the d1 port of the first two-position four-way valve, the first two positions The b1 port of the four-way valve is connected to the c2 port of the second two-position four-way valve through the first one-way valve, and the outlet of the second compressor passes through the second one-way valve and the c2 port of the second two-position four-way valve Connected, the d2 ports of the second two-position four-way valve are respectively connected to the first indoor condenser and the second indoor condenser inlet, and the outlets of the first indoor condenser and the second indoor condenser respectively pass through the first expansion valve and a second expansion valve is connected to the inlet of the third expansion valve, an outlet of the third expansion valve is connected to an inlet of the outdoor evaporator, and an outlet of the outdoor evaporator is connected to the a2 port of the second two-position four-way valve The b2 port of the second two-position four-way valve is respectively connected with the c1 port and the first two-position four-way valve An inlet of a liquid storage tank is connected, an outlet of the first liquid storage tank is connected to an inlet of the first compressor, and an a1 port of the first two-position four-way valve passes through the second liquid storage tank and the second compressor The inlet is connected, and the first indoor condenser, the second indoor condenser, and the outdoor evaporator are all equipped with fans.

The high-efficiency energy-saving air energy dual-machine heat pump air-conditioning system of the present invention, wherein the first, second, and third expansion valves are electronic expansion valves.

The energy-efficient air energy dual-machine heat pump air-conditioning system of the present invention, wherein the air-conditioning system is further provided with an economizer, and a first inlet of the economizer is connected to an outlet of the first electronic expansion valve and the second electronic expansion valve, The first outlet of the economizer is connected to the inlet of the second liquid storage tank through a fourth electronic expansion valve, the second inlet of the economizer and the second two The b2 port of the valve is connected, and the second outlet of the economizer is respectively connected with the a1 port of the first two-position four-way valve and the inlet of the first liquid storage tank, and the b2 port of the second two-position four-way valve is respectively replaced. It is connected to the c1 port of the first two-position four-way valve and the inlet of the first liquid storage tank.

The energy-efficient air energy dual-machine heat pump air-conditioning system of the present invention, wherein the air-conditioning system is further provided with an oil separator and a gas-liquid separator, wherein the oil separator is installed in the first and second one-way valves and the second two Between the four-way valves, the gas-liquid separator is installed between the oil separator, the economizer, the a1 port of the first two-position four-way valve and the first liquid storage tank, and the oil separator An oil outlet is connected to the inlet of the gas-liquid separator through a first capillary, and a second oil outlet of the oil separator is connected to an inlet of the gas-liquid separator through a solenoid valve and a second capillary, The second outlet of the economizer is connected to the inlet of the gas-liquid separator, and the outlet of the gas-liquid separator is connected to the inlet of the first two-position four-way valve and the inlet of the first liquid storage tank, respectively.

The high-efficiency energy-saving air energy dual-machine heat pump air-conditioning system of the present invention, wherein the opening degree of the first and second electronic expansion valves is controlled by a subcooling degree control system, and the subcooling degree control system comprises the first and the second a temperature sensor for determining a condensation temperature on a two-chamber condenser, a temperature sensor for measuring an outlet temperature at a corresponding condenser outlet, and a subcooling controller, the subcooling controller receiving the temperature After the signal processing of the sensor, outputting an instruction to control the opening degree of the corresponding electronic expansion valve; the opening degree of the third electronic expansion valve is controlled by the superheat degree control system, and the superheat degree control system is installed on the outdoor evaporator a temperature sensor for measuring an evaporation temperature, a temperature sensor for measuring an outlet temperature at an outdoor evaporator outlet, and a superheat controller, the superheat controller processing the received signal of the temperature sensor, and outputting Commanding to control an opening degree of the third electronic expansion valve; the opening degree of the fourth electronic expansion valve is controlled by a temperature control system, the temperature control system a temperature sensor and a temperature controller for measuring an outlet exhaust temperature at an outlet of the second compressor, the temperature controller processing the received signal of the temperature sensor, outputting an instruction, and controlling the fourth electronic expansion The opening of the valve.

The energy efficient air energy dual-machine heat pump air conditioning system of the present invention, wherein the power of the first compressor is greater than the power of the second compressor.

The energy-efficient air energy dual-machine heat pump air-conditioning system of the present invention, wherein the power ratio of the first compressor to the second compressor is 1.7:1.

The high-efficiency energy-saving air energy dual-machine heat pump air-conditioning system of the present invention is different from the prior art in that the high-efficiency energy-saving air energy dual-machine heat pump air-conditioning system of the present invention utilizes air to realize heating or cooling, has low price and can be used in winter and summer, and there is no waterway in the system. It is not afraid of freezing, suitable for use in cold or cold regions, and reliable in operation; the high-efficiency energy-saving air energy dual-machine heat pump air-conditioning system of the present invention includes first and second compressors, first and second indoor condensers, and includes the first two positions. The four-way valve and the second two-position four-way valve can realize the switching between cooling and heating when the second two-position four-way valve is reversed, and the single-stage compression and the two-stage compression can be realized when the first two-position four-way valve is reversed. Switching, the two indoor condensers can be started separately or simultaneously. The two compressors can also be started separately or simultaneously. When the two compressors are started at the same time, they can be operated in series or in parallel. The usage is flexible and applicable. The scope is wider and can be adjusted as needed; the energy efficiency coefficient of the high-efficiency energy-saving air energy dual-machine heat pump air-conditioning system of the invention can reach 2.5 or more, which is more efficient and energy-saving than the heat pump air-conditioning system in the prior art. specialty.

The first, second and third expansion valves of the high-efficiency energy-saving air energy dual-machine heat pump air-conditioning system are all electronic expansion valves, and the opening degrees of the first and second electronic expansion valves are controlled by the subcooling control system, and the third electron The opening of the expansion valve is controlled by the superheat control system, which makes the operation of the air conditioning system more stable. The high-efficiency energy-saving air energy dual-machine heat pump air-conditioning system of the present invention, the refrigerant and the lubricating oil in the first compressor and the second compressor are thoroughly mixed, and the refrigerant discharged from the first compressor or the second compressor is mixed A small amount of lubricating oil, which is equipped with an oil separator in the air conditioning system, can separate more than 99% of the lubricating oil. The outlet of the gas-liquid separator is respectively connected with the a1 port of the first two-position four-way valve and the inlet of the first liquid storage tank. Connected, the separated oil enters the gas-liquid separator and is then sent back to the compressor to solve the problem of difficulty in returning the oil under low temperature conditions and long-distance installation. The oil separator and the gas-liquid separator are set. It can ensure the amount of oil required by the compressor, and can also minimize the amount of oil entering the circulation system during heating or cooling, and improve the operating performance of the system.

The high-efficiency energy-saving air energy dual-machine heat pump air-conditioning system of the present invention will be further described below with reference to the accompanying drawings.

DRAWINGS

1 is a schematic structural view of a first form of a high-efficiency energy-saving air energy dual-machine heat pump air-conditioning system according to the present invention;

2 is a schematic structural view of a second form of a high-efficiency energy-saving air energy dual-machine heat pump air-conditioning system according to the present invention, and is also a schematic structural view when a compression mechanism is used;

3 is a schematic structural view of a two-stage compressor in a high-efficiency energy-saving air energy dual-machine heat pump air-conditioning system according to the present invention;

4 is a schematic structural view of a two-stage compressor in a high-efficiency energy-saving air energy dual-machine heat pump air-conditioning system according to the present invention;

5 is a schematic structural view of a high-efficiency energy-saving air energy dual-machine heat pump air-conditioning system according to the present invention;

6 is a control flow chart of a first electronic expansion valve and a second electronic expansion valve in a high-efficiency energy-saving air energy dual-machine heat pump air-conditioning system according to the present invention;

7 is a control flow chart of a third electronic expansion valve in a high-efficiency energy-saving air energy dual-machine heat pump air-conditioning system according to the present invention;

8 is a control flow chart of a fourth electronic expansion valve in a high efficiency energy-saving air energy dual-machine heat pump air-conditioning system according to the present invention.

detailed description

As shown in FIG. 1, the energy-efficient air energy dual-machine heat pump air-conditioning system of the present invention comprises a first compressor 11, a second compressor 12, a first two-position four-way valve 21, a second two-position four-way valve 22, and a first The check valve 31, the second check valve 32, the first liquid storage tank 41, the second liquid storage tank 42, the first indoor condenser 51, the second indoor condenser 52, the first electronic expansion valve 61, and the second electron Expansion valve 62, third electronic expansion valve 63, outdoor evaporator 71, outlet of first compressor 11 and first two-position four-way valve The d1 port of 21 is connected, the b1 port of the first two-position four-way valve 21 is connected to the c2 port of the second two-position four-way valve 22 through the first check valve 31, and the outlet of the second compressor 12 is passed through the second one-way. The valve 32 is connected to the c2 port of the second two-position four-way valve 22, and the d2 port of the second two-position four-way valve 22 is connected to the inlets of the first indoor condenser 51 and the second indoor condenser 52, respectively, the first indoor condenser 51 and the outlet of the second indoor condenser 52 are connected to the inlet of the third electronic expansion valve 63 through the first electronic expansion valve 61 and the second electronic expansion valve 62, respectively, the outlet of the third electronic expansion valve 63 and the outdoor evaporator 71 The inlet is connected, the outlet of the outdoor evaporator 71 is connected to the port a2 of the second two-position four-way valve 22, and the port b2 of the second two-position four-way valve 22 is respectively connected with the c1 port of the first two-position four-way valve 21 and the first The inlet of the liquid storage tank 41 is connected, the outlet of the first liquid storage tank 41 is connected to the inlet of the first compressor 11, and the a1 port of the first two-position four-way valve 21 passes through the second liquid storage tank 42 and the second compressor 12. The imports are connected. A fan is mounted on each of the first indoor condenser 51, the second indoor condenser 52, and the outdoor evaporator 71. The power of the two compressors may be different, for example, the power ratio of the first compressor 11 to the second compressor 12 is 1.7:1.

As shown in FIG. 6, the opening degrees of the first electronic expansion valve 61 and the second electronic expansion valve 62 are controlled by the subcooling control system. The subcooling degree control system includes a temperature sensor 1 for measuring the condensation temperature installed in the first indoor condenser 51, and a temperature sensor 1' for measuring the outlet temperature installed at the outlet of the first indoor condenser 51, respectively. Temperature sensors 2 and 2' and a subcooling controller on the second indoor condenser 52 and its outlet. The data measured by the temperature sensors 1, 1', 2, 2' is transmitted to the subcooling controller, and the subcooling controller processes the signals, and then outputs an instruction to control the adjustment of the first electronic expansion valve 61 and the second electronic expansion. The opening degree of the valve 62, the greater the degree of subcooling, the greater the opening degree.

As shown in Fig. 7, the opening degree of the third electronic expansion valve 63 is controlled by a superheat degree control system including temperature sensors 3 and 3' and a superheat degree controller. The temperature sensor 3 is mounted on the outdoor evaporator 71 for measuring the evaporation temperature, the temperature sensor 3' is installed at the outlet of the outdoor evaporator 71 for measuring the evaporator outlet temperature, and the temperature sensors 3 and 3' transmit the measured data to The superheat controller, after the superheat controller processes the signal, then outputs an instruction to control the opening of the third electronic expansion valve 63. The greater the degree of superheat, the greater the opening of the electronic expansion valve 63.

As shown in FIG. 2, the air conditioning system is further provided with an economizer 53, the first inlet 531 of the economizer 53 is connected to the outlets of the first electronic expansion valve 61 and the second electronic expansion valve 62, and the first outlet 531' of the economizer 53 Connected to the inlet of the second liquid storage tank 42 through the fourth electronic expansion valve 64, the second inlet 532 of the economizer 53 is connected to the b2 port of the second two-position four-way valve 22, and the second outlet 532' of the economizer 53 respectively It is connected to the a1 port of the first two-position four-way valve 21 and the inlet of the first liquid storage tank 41. The economizer 53 can recover a portion of the refrigerant heat, reduce the temperature of the exhaust port of the second compressor 12, improve the stability of the operation of the second compressor 12, and thereby improve the overall efficiency of the unit.

As shown in FIG. 8, the opening degree of the fourth electronic expansion valve 64 is controlled by a temperature control system including a temperature sensor 4 and a temperature controller for measuring the outlet exhaust temperature at the outlet of the second compressor 12. . The temperature controller processes the received signal of the temperature sensor 4, and outputs a command to control the opening degree of the fourth electronic expansion valve 64. When the temperature measured by the temperature sensor 4 is higher than its set temperature, for example, 70 ° C, the temperature controller controls the opening of the fourth electronic expansion valve 64 to increase, and vice versa. The fourth electronic expansion valve 64 is opened only when two compressors are operated in series to supply heat. The set temperature It is determined based on the actual matching of the two compressors.

As shown in FIG. 2, the air conditioning system is further provided with an oil separator 81 and a gas-liquid separator 82. The oil separator 81 is installed between the first and second check valves 31 and 32 and the second two-position four-way valve 22, The gas-liquid separator 82 is installed between the oil separator 81, the economizer 53, the first two-position four-way valve 21, and the first liquid storage tank 41, and the first oil outlet 811 of the oil separator 81 passes through the first capillary 91. Connected to the inlet of the gas-liquid separator 82, the second oil outlet 812 of the oil separator 81 is connected to the inlet of the gas-liquid separator 82 through the solenoid valve 93 and the second capillary 92, and the second outlet 532' of the economizer 53 is The inlet of the gas-liquid separator 82 is connected, and the outlet of the gas-liquid separator 82 is connected to the a1 port of the first two-position four-way valve 21 and the inlet of the first liquid storage tank 41, respectively. As shown in Fig. 3, the solenoid valve 93 is opened only when the two compressors are operated in parallel to perform heating.

The high-temperature high-pressure refrigerant vapor discharged through the first compressor 11 or the second compressor 12 is separated by the oil separator 81 before entering the c2 port of the second two-position four-way valve 22, the first compressor 11 and the second The refrigerant and the lubricating oil in the compressor 12 are sufficiently mixed, and the refrigerant discharged from the first compressor 11 or the second compressor 12 is mixed with a small amount of lubricating oil, and the oil separator 81 can be used for more than 99% of the lubricating oil. Separated, the amount of oil entering the circulation system during heating or cooling can be minimized, and the running performance of the system can be improved; on the other hand, the outlet of the gas-liquid separator 82 is connected to the inlet of the first liquid storage tank 41, and separated. The lubricating oil enters the gas-liquid separator 82 and is then sent back to the compressor to solve the problem of difficulty in returning the oil under low temperature conditions and at a long distance installation, and to ensure the amount of oil required by the compressor.

In the present invention, whether two indoor condensers should work at the same time, whether the two compressors should work at the same time, and whether the two compressors work in series or in parallel, can be considered according to people's requirements for indoor temperature and outdoor environment temperature. determine.

The high-efficiency energy-saving air energy dual-machine heat pump air-conditioning system of the invention is used for winter heating and summer cooling, and includes various working conditions, as follows:

When used for heating in winter, it includes the following conditions, such as:

(1) Referring to FIG. 2, when the outdoor temperature is higher than 0 ° C, the first compressor 11 or the second compressor 12 may be separately activated to start any indoor condenser or two indoor condensers:

A. The first compressor 11 and the first indoor condenser 51 are activated. At this time, the fan of the first indoor condenser 51 is started, and the fan of the second indoor condenser 52 is stopped: the first compressor 11 is started, and the first compressor 11 is started. The discharged high-temperature and high-pressure refrigerant vapor passes through the d1 port and the b1 port of the first two-position four-way valve 21, the first check valve 31, the oil separator 81, the c2 port and the d2 port of the second two-position four-way valve 22 The first indoor condenser 51 flows into the first indoor condenser 51, and the latent heat released when the refrigerant vapor condenses in the first indoor condenser 51 heats the indoor air to achieve the purpose of indoor heating; the condensed refrigerant flows through the first electronic expansion valve 61, The three-electron expansion valve 63 enters the outdoor evaporator 71, and the refrigerant absorbs heat of the outdoor air energy to evaporate. At this time, the opening degree of the first electronic expansion valve 61 is adjusted to the maximum; the second electronic expansion valve 62 adjusts the opening degree according to the degree of subcooling of the first indoor condenser 51, and the degree of supercooling is larger, the opening degree is larger, and vice versa. Small; the opening degree of the third electronic expansion valve 63 is controlled by the superheat degree control system to the required opening degree. The evaporated refrigerant passes through the a2 port and the b2 port of the second two-position four-way valve, the economizer 53, and the gas-liquid separation The device 82 enters the first liquid storage tank 41, is sucked by the first compressor 11 through the first liquid storage tank 41, and completes the heating cycle.

B. Starting the first compressor 11 and the second indoor condenser 52, the fan of the second indoor condenser 52 is started, and the fan of the first indoor condenser 51 is stopped: the first compressor 11 is started, and the first compressor 11 is discharged. The high temperature and high pressure refrigerant vapor flows through the d1 port and the b1 port of the first two-position four-way valve 21, the first check valve 31, the oil separator 81, the c2 port and the d2 port of the second two-position four-way valve 22 The two indoor condensers 52, the latent heat released when the refrigerant vapor condenses in the second indoor condenser 52 heats the indoor air to achieve indoor heating purposes; the condensed refrigerant flows through the second electronic expansion valve 62 and the third electron The expansion valve 63 enters the outdoor evaporator 71, and the flow and heat exchange process behind the refrigerant are the same as those described above. Under the condition of B, the opening degree adjustment of the second and first electronic expansion valves 62, 61 is opposite to the opening degree adjustment under the A working condition, and will not be described herein.

C. Starting the second compressor 12 and the first indoor condenser 51, the fan of the first indoor condenser 51 is started, and the fan of the second indoor condenser 52 is stopped: the high-temperature high-pressure refrigerant vapor discharged from the second compressor 12 passes through The second check valve 32, the oil separator 81, the c2 port and the d2 port of the second two-position four-way valve 22 flow into the first indoor condenser 51, and the latent heat released when the refrigerant vapor condenses in the first indoor condenser 51 will The indoor air is heated to achieve the purpose of indoor heating; the condensed refrigerant flows through the first electronic expansion valve 61 and the third electronic expansion valve 63 into the outdoor evaporator 71, and the refrigerant absorbs heat of the outdoor air energy to evaporate, and after evaporation The refrigerant enters the second liquid storage tank 42 through the a2 port and the b2 port of the second two-position four-way valve, the economizer 53, the gas-liquid separator 82, the a1 port and the c1 port of the first two-position four-way valve 21, and The second liquid storage tank 42 is then sucked in by the second compressor 12 to complete the heating cycle. Under the condition of C, the opening degree adjustment of the first, second, and third electronic expansion valves 61, 62, 63 is the same as that of the A working condition.

D. Starting the second compressor 12 and the second indoor condenser 52, the fan of the second indoor condenser 52 is turned on, and the fan of the first indoor condenser 51 is stopped: the second compressor 12 is started, and the second compressor 12 is discharged. The high temperature and high pressure refrigerant vapor flows into the second indoor condenser 52 through the second check valve 32, the oil separator 81, the c2 port and the d2 port of the second two-position four-way valve 22, and the refrigerant vapor is in the second indoor condenser The latent heat released during condensation in 52 heats the indoor air to achieve indoor heating purposes; the condensed refrigerant flows through the second electronic expansion valve 62 and the third electronic expansion valve 63 into the outdoor evaporator 71, and the refrigerant absorbs outdoor air energy. The heat is evaporated, and the flow and heat exchange process after the evaporated refrigerant is the same as the C working condition. Under the D operating conditions, the opening adjustments of the second and first electronic expansion valves 62, 61 are the same as those of the B operating condition.

E, starting the first compressor 11, the first indoor condenser 51, the second indoor condenser 52, the fans of the first and second indoor condensers 51, 52 are all activated: the high temperature and high pressure refrigerant discharged from the first compressor 11 The steam passes through the d1 port and the b1 port of the first two-position four-way valve 21, the first check valve 31, the oil separator 81, the c2 port and the d2 port of the second two-position four-way valve 22, and is divided into two paths. All the way into the first indoor condenser 51, the second way flows into the second indoor condenser 52, and the latent heat released when the refrigerant in the two channels condenses heats the indoor air to achieve the purpose of indoor heating. The refrigerant flowing through the first indoor condenser 51 and the first electronic expansion valve 61 merges with the refrigerant flowing through the second indoor condenser 52 and the second electronic expansion valve 62, and then enters the outdoor evaporator through the third electronic expansion valve 63. 71. The evaporated steam passes through the a2 port and the b2 port of the second two-position four-way valve, and the economizer 53. After the gas-liquid separator 82 enters the first liquid storage tank 41, the first liquid storage tank 41 is gas-liquid separated and then sucked by the first compressor 11 to complete the heating cycle. The E working condition is suitable for the case where the outdoor environment temperature is high, and the air conditioning low temperature operation can meet the needs of indoor heating. At this time, the first and second electronic expansion valves 61, 62 are fully open, and the third electronic expansion valve 63 is controlled by the superheat controller to adjust to the required opening degree.

F. Starting the second compressor 12, the first indoor condenser 51, and the second indoor condenser 52, the fans of the first and second indoor condensers 51, 52 are all activated: the high temperature and high pressure refrigerant discharged from the second compressor 12 The steam passes through the second check valve 32, the oil separator 81, the c2 port and the d2 port of the second two-position four-way valve 22, respectively, into the first indoor condenser 51 and the second indoor condenser 52, and the cooling in the two channels The latent heat released when the agent vapor condenses heats the indoor air to achieve the purpose of indoor heating; the flow and heat exchange process after the exothermic refrigerant is basically the same as the E working condition. The difference is that the refrigerant flowing through the a2 port and the b2 port of the second two-position four-way valve enters the first through the economizer 53, the gas-liquid separator 82, the a1 port and the c1 port of the first two-position four-way valve 21. The second liquid storage tank 42 is gas-liquid separated by the second liquid storage tank 42 and then sucked by the second compressor 12 to complete the heating cycle. The F working condition and the E working condition are also applicable to the outdoor environment temperature being high, and the air conditioning system can meet the indoor heating needs under the low temperature operation. At this time, the first and second electronic expansion valves 61, 62 are fully opened, and the third electronic expansion valve 63 is controlled by the superheat controller to adjust to the required opening degree.

(2) Referring to FIG. 3, when the outdoor temperature is between 0 ° C and -10 ° C, the first indoor condenser 51 and the second indoor condenser 52 are activated, and the fans of the first and second indoor condensers are simultaneously activated and started. The first compressor 11 and the second compressor 12, two compressors are operated in parallel:

G. The high-temperature high-pressure refrigerant vapor discharged from the first compressor 11 passes through the d1 port and the b1 port of the first two-position four-way valve 21, the first check valve 31, and the second compressor 12 passes through the second check valve. After the high-temperature and high-pressure refrigerant vapors discharged from the 32 are separated into the oil separator 81, they are passed through the c2 port and the d2 port of the second two-position four-way valve 22, and then flow into the first indoor condenser 51 and the second indoor condenser. 52; the refrigerant flowing through the first indoor condenser 51 and the first electronic expansion valve 61 is mixed with the refrigerant flowing through the second indoor condenser 52 and the second electronic expansion valve 62, and then expanded by the third electron expansion The valve 63 enters the outdoor evaporator 71, and the evaporated refrigerant passes through the a2 port and the b2 port of the second two-position four-way valve 22, the economizer 53, and the gas-liquid separator 82, and is divided into two paths, and enters the first liquid storage all the way. The tank 41 is sucked by the first compressor 11 through the first liquid storage tank 41 to complete the heating cycle of the first compressor 11; the other passage enters the second through the a1 port and the c1 port of the first two-position four-way valve 21; The liquid storage tank 42 is sucked by the second compressor 12 after passing through the second liquid storage tank 42, and the heating cycle of the second compressor 12 is completed. At this time, the opening degrees of the first, second, and third electronic expansion valves 61, 62, 63 are adjusted to the F operating conditions.

(3) When the outdoor temperature is between 0 ° C and -10 ° C, the first compressor 11 and the second compressor 12 are simultaneously activated, and the two compressors are operated in parallel, and the first indoor condenser 51 or the second indoor condenser is separately activated. 52:

H. The first indoor condenser 51 is separately activated, and the fan of the first indoor condenser 51 is turned on: the high-temperature high-pressure refrigerant vapor discharged from the first compressor 11 passes through the d1 port and the b1 port of the first two-position four-way valve 21 and After the first check valve 31, the high temperature and high pressure refrigerant vapor discharged from the second compressor 12 through the second check valve 32 enters the oil separator 81, and the oil separator is passed through the oil separator. After the separation 81, the c2 port and the d2 port of the second two-position four-way valve 22 flow into the first indoor condenser 51, and the latent heat released when the refrigerant vapor is condensed in the first indoor condenser 51 heats the indoor air; The liquid refrigerant condensed by the first indoor condenser (51) flows through the first electronic expansion valve (61) and the third electronic expansion valve (63) and enters the outdoor evaporator (71). The liquid refrigerant absorbs heat of the outdoor air and evaporates, and the evaporated air is evaporated. The agent enters the gas-liquid separator 82 through the a2 port and the b2 port of the second two-position four-way valve, and the economizer 53 is separated by the gas-liquid separator, and is divided into two paths, and enters the first liquid storage tank 41 all the way, through the first storage. After the liquid tank 41 is sucked by the first compressor 11, the heating cycle of the first compressor 11 is completed; the other passage enters the second liquid storage tank 42 through the a1 port and the c1 port of the first two-position four-way valve 21, After the second liquid storage tank 42 is sucked by the second compressor 12, the heating cycle of the second compressor 12 is completed. Under this condition, the opening degree adjustment of the first, second, and third electronic expansion valves is the same as that of the A working condition.

I. The second indoor condenser 52 is separately activated, and the fan of the second indoor condenser 52 is turned on: under this working condition, the circulation route of the refrigerant is substantially the same as the H working condition. The difference is that the high-temperature and high-pressure refrigerant vapor flowing out through the ports c2 and d2 of the second two-position four-way valve 22 enters the second indoor condenser 52 to be cooled, and then enters the outdoor evaporation through the second and third electronic expansion valves 62 and 63. The opening degree adjustment of the first and second electronic expansion valves 61, 62 of such working conditions is opposite to that of the H operating condition.

J. When the outdoor temperature is less than -10 ° C, as shown in FIG. 4, the first compressor 11 and the second compressor 12 are simultaneously activated, and the two compressors are operated in series, and the first indoor condenser 51 and the second are simultaneously activated. The indoor condenser 52, at this time, the first two-position four-way valve 21 is reversed, the a1 port and the b1 port are communicated, and the d1 port and the c1 port are communicated: the high-temperature high-pressure refrigerant vapor discharged from the first compressor 11 passes through the first two positions. The d1 port, the c1 port, and the second liquid storage tank 42 of the four-way valve 21 are sucked by the second compressor 12 to continue to be pressurized, and the higher temperature and high pressure refrigerant vapor discharged from the second compressor 12 passes through the second single. The first indoor condenser 51 and the second indoor condenser 52 are respectively flowed into the c2 port and the d2 port of the valve 32, the oil separator 81, and the second two-position four-way valve 22, and the refrigerant vapors in the two channels are condensed. The latent heat heats the indoor air. The condensed refrigerant flows through the first electronic expansion valve 61 and the second electronic expansion valve 62, respectively, and then merges into two paths, one way enters the outdoor evaporator 71 through the third electronic expansion valve 63, and then the refrigerant passes through the second After the a2 port and the b2 port of the 4/2-way valve, the second inlet 532 and the second outlet 532' of the economizer 53, and the gas-liquid separator 82, the first liquid storage tank 41 is entered, and the first liquid storage tank 41 is ventilated. After the liquid separation, it is sucked by the first compressor 11 to complete the heating cycle; the other passes through the first inlet 531 and the first outlet 531' of the economizer 53, and the fourth electronic expansion valve 64, and then enters the second liquid storage tank 42, and then enters the second liquid storage tank 42, and then enters the second liquid storage tank 42 Inhaled by the second compressor. When the two compressors are connected in series, the first compressor 11 supplies air to the second compressor 12, and the high-pressure refrigerant, that is, the high-temperature high-pressure refrigerant vapor in the first compressor 11, is sent to the second compressor 12, and then passes through the second The compressor 12 is compressed and discharged to achieve two-stage compression. In this working condition, the opening degree adjustment of the first, second, and third electronic expansion valves is the same as the G working condition. At this time, in order to prevent the temperature of the suction of the second compressor 12 from being excessively high, the fourth electronic expansion valve 64 is opened, and the first inlet 531 and the first outlet 531' of the economizer 53 are connected to the air conditioning system, and are condensed through the first chamber. The refrigerant condensed by the device 51 and the second indoor condenser 52 passes through the first inlet 531 and the first outlet 531' of the economizer 53, and the fourth electronic expansion valve 64, and passes through the first two-way four-way with the first compressor. The d1 port of the valve 21 and the high-temperature high-pressure refrigerant vapor discharged from the c1 port are mixed, and then enter the second liquid storage tank 42 and sucked by the second compressor 12 to lower the suction temperature and further reduce the exhaust temperature of the second compressor 12. the goal of. When the exhaust temperature of the outlet of the second compressor 12 is higher than the set When the temperature is set, the opening degree of the fourth electronic expansion valve 64 is increased, and vice versa.

(4) Referring to FIG. 4, when the outdoor temperature is less than -10 ° C, the first compressor 11 and the second compressor 12 are simultaneously started, and the two compressors are operated in series, and the first indoor condenser 51 or the second indoor condensation is separately activated. 52:

K. Starting the first indoor condenser 51 alone, when the fan of the first indoor condenser 51 is turned on: it is not difficult to understand that under this working condition, the circulation route and the heat exchange process of the refrigerant are the same as the J working condition, and the difference is different. The higher high-temperature and high-pressure refrigerant flowing out through the ports c2 and d2 of the second two-position four-way valve 22 directly enters the first indoor condenser 51, and then flows into the outdoor evaporation through the first and third electronic expansion valves 61 and 63 after the heat is dissipated. In this operating condition, the opening degrees of the first, second, and third electronic expansion valves 61, 62, 63 are adjusted to be the same as the H operating conditions.

L. When the second indoor condenser 52 is separately activated: the high temperature and high pressure refrigerant vapor discharged from the second compressor 12 passes through the second check valve 32, the oil separator 81, the c2 port of the second two-position four-way valve 22, and The d2 port flows into the second indoor condenser 52, and the latent heat released when the refrigerant vapor condenses heats the indoor air, and the liquid refrigerant condensed by the second indoor condenser 52 flows through the second electronic expansion valve 62 and the third electronic expansion. The valve 63 enters the outdoor evaporator 71, and the liquid refrigerant absorbs the heat of the outdoor air energy and evaporates. The circulation route behind the evaporated refrigerant is exactly the same as the K working condition. To avoid cumbersomeness, the description will not be repeated herein. Under this condition, the opening degrees of the first and second electronic expansion valves 61, 62 are adjusted to be the same as the B operating conditions.

Referring to FIG. 5, the high-efficiency energy-saving air energy dual-machine heat pump air-conditioning system of the present invention normally starts one compressor (the first compressor 11 or the second compressor 12) in the summer cooling to satisfy two indoor condensers (first indoor condensation) The requirements of the device 51 and/or the second indoor condenser 52). During the summer cooling, the second two-position four-way valve 22 is reversed, and the c2 and a2 ports are connected, and the d2 and b2 ports are connected. The outdoor evaporator 71 functions as a condenser, discharges heat to the outdoor air, and the refrigerant vapor condenses into a liquid, while the two indoor condensers 51 and 52 function as an evaporator, and the liquid refrigerant evaporates into a gaseous state, absorbing heat in the room, giving The indoor air is cooled to achieve the purpose of cooling.

In the cooling state, the third electronic expansion valve 63 is fully open. When an indoor condenser (the first indoor condenser 51 or the second indoor condenser 52) is turned on, an electronic expansion valve (the first electronic expansion valve 61 or the second electronic expansion valve corresponding to one of the opened condensers) 62) Turn on, and adjust the opening degree by the control of the superheat controller, and the other electronic expansion valve is closed.

If two indoor condensers (51, 52) are simultaneously turned on, the respective electronic expansion valves 61, 62 are controlled by respective superheat controllers to adjust the opening degrees of the respective electronic expansion valves 61, 62 to improve work efficiency. Reduce energy consumption.

The working process during cooling is briefly described as follows: the high temperature and high pressure refrigerant vapor discharged from the first compressor 11 or the second compressor 12 enters the outdoor evaporator through the oil separator 81, the c2 and a2 ports of the second two-position four-way valve 22 The heat dissipation is condensed into a liquid, and then flows into the first electronic expansion valve 61, the first indoor condenser 51, and/or the second electronic expansion valve 62, and the second indoor condenser 52 through the third electronic expansion valve 63, absorbing the indoor air heat evaporation. As refrigerant vapor, the refrigerant then passes through the d2 and b2 ports of the second two-position four-way valve 22, the economizer 53, and the gas-liquid separator 82, and then splits into two paths: one way back to the first liquid storage tank 41, and the other path The a1 and c1 ports of the first two-position four-way valve 21 return to the second liquid storage tank 42, and are corresponding to the first compressor 11 or the second The compressor 12 is sucked in to complete the refrigeration cycle.

The high-efficiency energy-saving air energy double-machine heat pump air-conditioning system of the invention can realize heating or cooling by using air, has low price and can be used in winter and summer, has no waterway in the system, is not afraid of freezing, is suitable for use in cold or cold regions, and works reliably; the energy-efficient air of the invention is efficient The dual-machine heat pump air-conditioning system includes first and second compressors, first and second indoor condensers, and further includes a first two-position four-way valve and a second two-position four-way valve, and a second two-position four-way valve Switching between cooling and heating can be realized during commutation. The first two-position four-way valve can realize single-stage compression and two-stage compression switching. Two indoor condensers can be used separately or simultaneously, and two compressors are also used. It can be started separately or at the same time. When the two compressors are started at the same time, they can be operated in series or in parallel. The use mode is flexible and diverse, and the applicable temperature range is wider. It can be adjusted as needed. The test shows that the invention is energy efficient. The energy efficiency coefficient of the air energy dual-machine heat pump air conditioning system can reach 2.5 or more, and the efficiency is higher and the energy saving is more obvious than the heat pump air conditioning system in the prior art.

The embodiments described above are only intended to describe the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various embodiments of the present invention may be made by those skilled in the art without departing from the spirit of the invention. Modifications and improvements are intended to fall within the scope of the invention as defined by the appended claims.

Industrial applicability

The high-efficiency energy-saving air energy dual-machine heat pump air-conditioning system of the invention can use air to supply heat to a house or a region, and is suitable for use in cold or cold regions. The high-efficiency energy-saving air energy dual-machine heat pump air-conditioning system of the invention can be used in winter and summer, and has reliable, high-efficiency and energy-saving work, and the energy efficiency coefficient can reach 2.5 or more, the price is low, and can be adjusted as needed.

Claims (7)

An energy-efficient air energy dual-machine heat pump air-conditioning system, comprising a compressor, a two-position four-way valve, an indoor condenser, an expansion valve, an outdoor evaporator and a liquid storage tank, characterized in that: the compressor, the two-way four-way There are two valves, an indoor condenser and a liquid storage tank, and the expansion valve has three, and further includes two one-way valves, wherein the outlet of the first compressor (11) and the first two-position four-way valve (21) The d1 port is connected, and the b1 port of the first two-position four-way valve (21) is connected to the c2 port of the second two-position four-way valve (22) through the first one-way valve (31), and the second compressor (12) The outlet of the second two-way valve (22) is connected to the c2 port of the second two-position four-way valve (22), and the d2 port of the second two-position four-way valve (22) is respectively connected to the first indoor The condenser (51) is connected to the inlet of the second indoor condenser (52), and the outlets of the first indoor condenser (51) and the second indoor condenser (52) respectively pass through the first expansion valve (61) and the second expansion valve (62) connected to the inlet of the third expansion valve (63), the outlet of the third expansion valve (63) is connected to the inlet of the outdoor evaporator (71), the outlet of the outdoor evaporator (71) is Second two-position four-way valve (22) A2 port is connected, the b2 port of the second two-position four-way valve (22) is respectively connected with the c1 port of the first two-position four-way valve (21) and the inlet of the first liquid storage tank (41), An outlet of the liquid storage tank (41) is connected to the inlet of the first compressor (11), and the a1 port of the first two-position four-way valve (21) passes through the second liquid storage tank (42) and the second compressor The inlets of (12) are connected, and the first indoor condenser (51), the second indoor condenser (52), and the outdoor evaporator (71) are all equipped with fans. The energy-efficient air energy dual-machine heat pump air-conditioning system according to claim 1, wherein the first, second, and third expansion valves (61, 62, 63) are electronic expansion valves. The energy-efficient air energy dual-machine heat pump air-conditioning system according to claim 2, wherein the air conditioning system is further provided with an economizer (53), and the first inlet (531) and the first of the economizer (53) An electronic expansion valve (61) is connected to an outlet of the second electronic expansion valve (62), and the first outlet (531') of the economizer (53) passes through the fourth electronic expansion valve (64) and the second storage The inlet of the liquid tank (42) is connected, the second inlet (532) of the economizer (53) is connected to the port b2 of the second two-position four-way valve (22), and the economizer (53) is The two outlets (532') are respectively connected with the a1 port of the first two-position four-way valve (21) and the inlet of the first liquid storage tank (41), respectively, replacing the b2 ports of the second two-position four-way valve (22) It is connected to the c1 port of the first two-position four-way valve (21) and the inlet of the first liquid storage tank (41). The energy-efficient air energy dual-machine heat pump air-conditioning system according to claim 2 or 3, wherein the air conditioning system further comprises an oil separator (81) and a gas-liquid separator (82), the oil separator ( 81) installed between the first and second one-way valves (31, 32) and the second two-position four-way valve (22), and the gas-liquid separator (82) is installed in the oil separator ( 81), between the economizer (53), the first two-position four-way valve (21) and the first liquid storage tank (41), the first oil outlet (811) of the oil separator (81) passes through A capillary (91) is connected to the inlet of the gas-liquid separator (82), and the second oil outlet (812) of the oil separator (81) passes through the electromagnetic valve (93) and the second capillary (92). Gas-liquid fraction The inlet of the separator (82) is connected, the second outlet (532') of the economizer (53) is connected to the inlet of the gas-liquid separator (82), and the outlets of the gas-liquid separator (82) are respectively It is connected to the a1 port of the first two-position four-way valve (21) and the inlet of the first liquid storage tank (41). The energy-efficient air energy dual-machine heat pump air-conditioning system according to claim 4, wherein the opening degrees of said first and second electronic expansion valves (61, 62) are controlled by a subcooling control system, said The coldness control system includes temperature sensors (1, 2) for measuring the condensation temperature respectively installed on the first and second indoor condensers (51, 52), and temperature for measuring the outlet temperature at the outlet of the corresponding condenser. a sensor (1', 2') and a subcooling controller, the subcooling controller outputs a signal of the temperature sensor, and outputs an instruction to control an opening of the corresponding electronic expansion valve; The opening degree of the third electronic expansion valve (63) is controlled by a superheat degree control system including a temperature sensor (3) for measuring the evaporating temperature mounted on the outdoor evaporator (71), a temperature sensor (3') for measuring an outlet temperature and a superheat controller at an outlet of the outdoor evaporator (71), the superheat controller processing the received signal of the temperature sensor, outputting an instruction, and controlling the The opening of the three-electron expansion valve (63); The opening degree of the fourth electronic expansion valve (64) is controlled by a temperature control system including a temperature sensor (4) installed at an outlet of the second compressor (12) for measuring an outlet exhaust temperature and a temperature controller that processes the received signal of the temperature sensor (4) and outputs an instruction to control the opening of the fourth electronic expansion valve (64). The energy efficient air energy dual-machine heat pump air conditioning system according to claim 5, characterized in that the power of the first compressor (11) is greater than the power of the second compressor (12). The energy efficient air energy dual-machine heat pump air conditioning system according to claim 6, wherein the power ratio of the first compressor (11) to the second compressor (12) is 1.7:1.

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