[go: up one dir, main page]

WO2018042490A1 - Dispositif à cycle de réfrigération - Google Patents

Dispositif à cycle de réfrigération Download PDF

Info

Publication number
WO2018042490A1
WO2018042490A1 PCT/JP2016/075197 JP2016075197W WO2018042490A1 WO 2018042490 A1 WO2018042490 A1 WO 2018042490A1 JP 2016075197 W JP2016075197 W JP 2016075197W WO 2018042490 A1 WO2018042490 A1 WO 2018042490A1
Authority
WO
WIPO (PCT)
Prior art keywords
refrigerant
compressor
refrigeration cycle
heat exchanger
cycle apparatus
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2016/075197
Other languages
English (en)
Japanese (ja)
Inventor
康平 名島
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to PCT/JP2016/075197 priority Critical patent/WO2018042490A1/fr
Publication of WO2018042490A1 publication Critical patent/WO2018042490A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B13/00—Compression machines, plants or systems, with reversible cycle

Definitions

  • the present invention relates to a refrigeration cycle apparatus used as an air conditioner or the like.
  • an air conditioner such as a multi air conditioner for a building
  • a heat source unit (outdoor unit) is arranged outside the building
  • a use side unit (indoor unit) is arranged inside the building, and each element mounted on them Has a refrigerant circuit connected by piping.
  • the refrigerant circulated in the refrigerant circuit of such an air conditioner radiates heat to the air supplied to the heat exchanger of the user side machine during the heating operation and heats the air. Then, the heated air is sent into the air-conditioning target space for heating.
  • coolant absorbs heat from the air supplied to the heat exchanger of a utilization side machine, and cools this air. Then, the cooled air is sent into the air-conditioning target space for cooling.
  • R32 difluoromethane of HFC refrigerant, which is a flammable refrigerant, hydrofluoroolefin refrigerant (HFO1234yf, HFO1234ze, etc.), R32, A mixed refrigerant with an HFO system or a natural refrigerant such as R290 (propane) or R600a (isobutane) has attracted attention.
  • R32 refrigerant and R290 refrigerant are flammable refrigerants, products with sufficient consideration for safety must be designed.
  • R290 refrigerant has a strong flammability and requires careful handling.
  • the R32 refrigerant is less flammable than the R290 refrigerant and can be designed to be relatively similar to the non-flammable refrigerants of the R22 refrigerant and the R410A refrigerant.
  • the R32 refrigerant is also flammable, a safety design is required. For this reason, when using combustible refrigerant
  • liquid refrigerant is stored in the refrigerant circuit (in the pipe) after the cooling operation is stopped, and the opening degree of one of the motor-operated valves is fixed to an opening degree close to full closure.
  • the rise in pressure in the pipe is suppressed, but since the opening of the motorized valve is fixed at an opening close to full closure, the rise in pressure in the pipe is effective due to an increase in the outside air temperature. Cannot be suppressed.
  • the opening degree of one motor-operated valve is enlarged, although the rise in the pressure in piping can be suppressed, the start-up at the time of resumption of a cooling operation will deteriorate.
  • an existing air conditioner using R22 refrigerant or R410A does not assume that a flammable refrigerant is used, and thus lacks consideration for safety when a flammable refrigerant is used. Even in Patent Document 1, it cannot be said that a countermeasure against an increase in pressure in the pipe is sufficiently considered.
  • the present invention has been made to solve the above-described problems, and provides a refrigeration cycle apparatus that is improved in stand-up performance when resuming cooling operation and in safety when refrigerant leaks. Objective.
  • a refrigeration cycle apparatus has a refrigerant circuit in which a compressor, a check valve, a first heat exchanger, a refrigerant shut-off device, a throttling device, and a second heat exchanger are sequentially connected by refrigerant piping,
  • a control device for controlling the operation of the compressor and the refrigerant shut-off device is provided, and the control device stops the driving of the compressor when stopping the operation, and simultaneously with the stop of the compressor or the compressor
  • the refrigerant shut-off device is closed within a set time after stopping.
  • the refrigeration cycle apparatus stops the operation of the compressor when stopping the operation, and closes the refrigerant shut-off device simultaneously with the stop of the compressor or within a set time after the compressor stops. It is possible to improve the start-up property at the time of restarting operation, and to improve the safety at the time of refrigerant leakage.
  • FIG. 1 is a schematic configuration diagram showing an example of a refrigerant circuit configuration of a refrigeration cycle apparatus (hereinafter referred to as refrigeration cycle apparatus 100A) according to Embodiment 1 of the present invention.
  • a refrigeration cycle apparatus 100A will be described with reference to FIG.
  • the refrigeration cycle apparatus 100A is used as, for example, an air conditioner that heats or cools an air-conditioning target space.
  • the refrigeration cycle apparatus 100A is an air conditioner will be described as an example.
  • FIG. 1 is a schematic configuration diagram showing an example of a refrigerant circuit configuration of a refrigeration cycle apparatus (hereinafter referred to as refrigeration cycle apparatus 100A) according to Embodiment 1 of the present invention.
  • a refrigeration cycle apparatus 100A will be described with reference to FIG.
  • the refrigeration cycle apparatus 100A is used as, for example, an air conditioner that heats or cools an air-conditioning target space.
  • the refrigeration cycle apparatus 100A is an air conditioner will be described as an example.
  • the refrigeration cycle apparatus 100A has a refrigeration cycle for circulating refrigerant, and each indoor unit 50 can freely select a cooling operation mode or a heating operation mode as an operation mode.
  • the refrigeration cycle apparatus 100 ⁇ / b> A can set the operation mode of each indoor unit 50 to the cooling operation mode or the heating operation mode by the refrigerant flow switching device 13.
  • the refrigeration cycle apparatus 100A includes an outdoor unit 10 that is a heat source unit and an indoor unit 50 that is a use side unit.
  • the outdoor unit 10 and the indoor unit 50 are connected by a refrigerant pipe 4.
  • the outdoor unit 10 is illustrated.
  • the number of indoor units 50 is not particularly limited.
  • the indoor unit 50a and the indoor unit 50b are collectively described as the indoor unit 50 when it is not necessary to distinguish between the indoor unit 50a and the indoor unit 50b.
  • the components mounted on the indoor unit 50a and the indoor unit 50b are also illustrated by adding “a” and “b” at the end of the reference numerals, but “a” when there is no need to distinguish between them. , “B” is omitted.
  • the outdoor unit 10 is installed in a space (for example, outdoors) different from the air-conditioning target space, and has a function of supplying cold or warm heat to the indoor unit 50.
  • the outdoor unit 10 includes a compressor 11, a check valve 12, a refrigerant flow switching device 13, a heat source side heat exchanger 14, and an accumulator 16.
  • An outdoor fan 15 is mounted on the outdoor unit 10.
  • the compressor 11 compresses the refrigerant flowing in through the accumulator 16 and discharges it as a high-temperature and high-pressure gas refrigerant.
  • the compressor 11 can be composed of, for example, a rotary compressor, a scroll compressor, a screw compressor, a reciprocating compressor, or the like. Moreover, it is good to comprise the compressor 11 with the inverter compressor which can carry out capacity control.
  • the heat source side heat exchanger 14 functions as a condenser
  • the refrigerant discharged from the compressor 11 passes through the refrigerant pipe 4 and is sent to the heat source side heat exchanger 14.
  • the heat source side heat exchanger 14 functions as an evaporator
  • the refrigerant discharged from the compressor 11 passes through the refrigerant pipe 4, passes through the indoor unit 50, and then is sent to the heat source side heat exchanger 14.
  • the check valve 12 is provided on the discharge side of the compressor 11 and allows the refrigerant to flow in only one direction.
  • the refrigerant flow switching device 13 is provided on the discharge side of the compressor 11 and switches the refrigerant flow between the heating operation mode and the cooling operation mode.
  • the refrigerant flow switching device 13 can be composed of, for example, a two-way valve, a combination of three-way valves, or a four-way valve. However, when the refrigeration cycle apparatus 100A is a cooling only machine, the refrigerant flow switching device 13 need not be provided.
  • the heat source side heat exchanger 14 acts as an evaporator during heating operation, and acts as a condenser during cooling operation, and between a heat exchange fluid such as air supplied from a fluid transfer device such as the outdoor fan 15 and the refrigerant. Heat exchange is performed.
  • the heat source side heat exchanger 14 is, for example, a fin-and-tube heat exchanger, a microchannel heat exchanger, a shell-and-tube heat exchanger, a heat pipe heat exchanger, a double pipe heat exchanger, a plate A heat exchanger or the like can be used.
  • a case where the heat source side heat exchanger 14 is a fin-and-tube heat exchanger will be described as an example.
  • the outdoor fan 15 is an example of a fluid transfer device, and supplies air that is a heat exchange fluid to the heat source side heat exchanger 14.
  • the outdoor fan 15 can be composed of, for example, a propeller fan having a plurality of blades.
  • the outdoor fan 15 should just be installed in the place which can supply air to the heat source side heat exchanger 14.
  • FIG. Moreover, the fluid conveyance apparatus which supplies a heat exchange fluid to the heat source side heat exchanger 14 also changes according to the type of the heat source side heat exchanger 14. For example, when the heat exchange fluid is water or brine, a pump is mounted on the outdoor unit 10 as a fluid transfer device instead of the outdoor fan 15.
  • the accumulator 16 is provided on the suction side of the compressor 11 and is a surplus refrigerant due to a difference between the heating operation mode and the cooling operation mode, a transient operation change (for example, a change in the number of indoor units 50 operated), or The surplus refrigerant generated by the load condition is stored.
  • the accumulator 16 separates the liquid refrigerant and the gas refrigerant, and only the gas refrigerant is supplied to the compressor 11.
  • the accumulator 16 is not essential for the refrigerant circuit configuration of the refrigeration cycle apparatus 100A.
  • the outdoor unit 10 has a control device 70 that performs overall control of the refrigeration cycle apparatus 100A.
  • Each actuator (drive component) is connected to the control device 70, and the control device 70 controls the operation of each actuator.
  • the actuator include the compressor 11, the refrigerant flow switching device 13, the outdoor fan 15, the refrigerant blocking device 54, the expansion device 53, the high-pressure escape device 52, the indoor fan 56, and the like.
  • the control device 70 controls the operation of each actuator based on detection values from the pressure detection means 55 and other various sensors (not shown).
  • the control device 70 can be configured by hardware such as a circuit device that realizes the function, or can be configured by an arithmetic device such as a microcomputer or a CPU and software executed thereon.
  • the indoor unit 50 can also be provided with a control device so that it can communicate with the control device 70.
  • the indoor unit 50 includes a control device, an instruction from a remote controller or the like is input to the control device 70 via the control device of the indoor unit 50.
  • the indoor unit 50 is installed in a space (for example, indoors) that supplies cold or hot heat to the air-conditioning target space, and has a function of cooling or heating the air-conditioning target space with the cold or hot heat supplied from the outdoor unit 10.
  • the indoor unit 50 includes a use-side heat exchanger 51, a throttle device 53, a refrigerant shut-off device 54, a pressure detection unit 55, and a high-pressure escape device 52.
  • the indoor unit 50 is equipped with an indoor fan 56. Further, the indoor unit 50 is provided with a bypass pipe 59A that bypasses the use side heat exchanger 51.
  • the use-side heat exchanger 51 acts as a condenser during heating operation, and acts as an evaporator during cooling operation, and between a heat exchange fluid such as air supplied from a fluid transfer device such as the indoor fan 56 and the heat medium.
  • the heat exchange is performed in order to generate heating air or cooling air to be supplied to an air-conditioned space such as an indoor space.
  • the use-side heat exchanger 51 is, for example, a fin-and-tube heat exchanger, a microchannel heat exchanger, a shell-and-tube heat exchanger, a heat pipe heat exchanger, a double pipe heat exchanger, a plate A heat exchanger or the like can be used.
  • a case where the use side heat exchanger 51 is a fin-and-tube heat exchanger will be described as an example.
  • the indoor fan 56 is an example of a fluid conveyance device, and supplies air as a heat exchange fluid to the use side heat exchanger 51.
  • the indoor fan 56 can be composed of, for example, a propeller fan having a plurality of blades.
  • the indoor fan 56 should just be installed in the place which can supply air to the utilization side heat exchanger 51.
  • FIG. Further, the fluid transfer device that supplies the heat exchange fluid to the use side heat exchanger 51 also changes according to the type of the use side heat exchanger 51. For example, when the heat exchange fluid is water or brine, a pump is mounted on the indoor unit 50 as a fluid transfer device instead of the indoor fan 56.
  • the expansion device 53 expands and depressurizes the refrigerant that has passed through the use side heat exchanger 51 or the heat source side heat exchanger 14.
  • the expansion device 53 may be configured by an electric expansion valve or the like that can adjust the flow rate of the refrigerant, for example.
  • an electric expansion valve not only an electric expansion valve but also a mechanical expansion valve employing a diaphragm for a pressure receiving portion, a capillary tube, or the like can be applied.
  • the bypass pipe 59 ⁇ / b> A is provided so as to bypass the use side heat exchanger 51 by connecting the refrigerant inlet / outlet of the use side heat exchanger 51.
  • the refrigerant blocking device 54 blocks the refrigerant flow by opening and closing the refrigerant pipe 4.
  • the refrigerant shut-off device 54 is provided on the side opposite to the use-side heat exchanger 51 of the expansion device 53, that is, on the upstream side of the expansion device 53 in the refrigerant flow in the cooling operation mode.
  • the refrigerant shut-off device 54 can be configured by, for example, an electromagnetic valve that can open and close the refrigerant pipe 4.
  • the pressure detection means 55 detects the pressure of the refrigerant flowing through the refrigerant pipe 4 at the installation location.
  • the pressure detection means 55 is provided on the opposite side of the refrigerant shut-off device 54 from the expansion device 53, that is, on the upstream side of the refrigerant shut-off device 54 in the refrigerant flow in the cooling operation mode.
  • the pressure detection means 55 can be comprised with a pressure sensor, for example.
  • the high-pressure escape device 52 allows the refrigerant to flow by opening and closing the bypass pipe 59A.
  • the high pressure relief device 52 is provided in the bypass pipe 59A.
  • the high-pressure escape device 52 can be configured by, for example, an electromagnetic valve that can open and close the bypass pipe 59A.
  • the compressor 11, the refrigerant flow switching device 13, the heat source side heat exchanger 14, the refrigerant shut-off device 54, the expansion device 53, the use side heat exchanger 51, and the accumulator 16 are:
  • the refrigerant pipes 4 are connected to form a refrigerant circuit.
  • the refrigerant inlet / outlet of the use side heat exchanger 51 is connected by the bypass pipe 59A to form a bypass circuit.
  • the compressor 11 when the refrigerant flows through the bypass pipe 59A, the compressor 11, the refrigerant flow switching device 13, the heat source side heat exchanger 14, the high-pressure escape device 52, and the accumulator 16 are connected by the refrigerant pipe 4 and the bypass pipe 59A.
  • the refrigerant flows.
  • the refrigeration cycle apparatus 100 ⁇ / b> A can perform a cooling operation or a heating operation in the indoor unit 50 based on an instruction from the indoor unit 50. That is, in the refrigeration cycle apparatus 100A, the same operation of the cooling operation or the heating operation can be executed in all of the connected indoor units 50.
  • the operation of each actuator is controlled by the control device 70.
  • cooling operation mode executed by the refrigeration cycle apparatus 100A
  • the flow of the refrigerant in the cooling operation mode is indicated by a broken line arrow in FIG.
  • the cooling operation mode of the refrigeration cycle apparatus 100A will be described by taking as an example a case where the heat exchange fluid is air and the heat exchange fluid is a refrigerant.
  • the outdoor unit 10 causes the refrigerant discharged from the compressor 11 to flow into the use side heat exchanger 51 via the heat source side heat exchanger 14.
  • the refrigerant flow switching device 13 is switched.
  • a low-temperature and low-pressure refrigerant is compressed by the compressor 11 and discharged as a high-temperature and high-pressure gas refrigerant.
  • the high-temperature and high-pressure gas refrigerant discharged from the compressor 11 flows into the heat source side heat exchanger 14 via the check valve 12 and the refrigerant flow switching device 13.
  • the refrigerant flowing into the heat source side heat exchanger 14 is heat-exchanged (condensed) with the air supplied by the outdoor fan 15 and flows out of the heat source side heat exchanger 14 as a high-temperature and high-pressure liquid refrigerant.
  • the high-temperature and high-pressure liquid refrigerant that has flowed into the indoor unit 50 passes through the refrigerant shut-off device 54 and is then cooled by the expansion device 53 provided in front of the use-side heat exchanger 51. ) And flows into the use side heat exchanger 51.
  • the refrigerant that has flowed into the use-side heat exchanger 51 is heat-exchanged (evaporated) with the air supplied by the indoor fan 56 and flows out of the use-side heat exchanger 51 as a low-temperature and low-pressure gas refrigerant.
  • the refrigerant absorbs heat from the air, whereby the air-conditioning target space is cooled.
  • the refrigerant that has flowed out of the use-side heat exchanger 51 passes through the refrigerant pipe 4 and flows into the outdoor unit 10 again.
  • the refrigerant that has flowed into the outdoor unit 10 is again sucked into the compressor 11 via the refrigerant flow switching device 13 and the accumulator 16. Thereafter, this cycle is repeated.
  • Heating operation mode Next, the heating operation mode performed by the refrigeration cycle apparatus 100A will be described. In addition, the flow of the refrigerant
  • the heating operation mode of the refrigeration cycle apparatus 100A will be described by taking as an example a case where the heat exchange fluid is air and the heat exchange fluid is a refrigerant.
  • the outdoor unit 10 causes the refrigerant discharged from the compressor 11 to flow into the use side heat exchanger 51 without passing through the heat source side heat exchanger 14. Then, the refrigerant flow switching device 13 is switched.
  • a low-temperature and low-pressure refrigerant is compressed by the compressor 11 and discharged as a high-temperature and high-pressure gas refrigerant.
  • the high-temperature and high-pressure gas refrigerant discharged from the compressor 11 flows into the use side heat exchanger 51 via the check valve 12 and the refrigerant flow switching device 13.
  • the refrigerant that has flowed into the use-side heat exchanger 51 is heat-exchanged (condensed) with the air supplied by the indoor fan 56 and flows out of the use-side heat exchanger 51 as a high-temperature and high-pressure liquid refrigerant.
  • the refrigerant radiates heat to the air, whereby the air-conditioning target space is heated.
  • the high-temperature and high-pressure liquid refrigerant that has flowed out of the use-side heat exchanger 51 becomes a low-temperature and low-pressure liquid refrigerant (or a two-phase refrigerant) by the expansion device 53.
  • This refrigerant flows into the heat source side heat exchanger 14 of the outdoor unit 10 via the refrigerant shut-off device 54.
  • the refrigerant flowing into the heat source side heat exchanger 14 is heat-exchanged (evaporated) with the air supplied by the outdoor fan 15, and flows out of the heat source side heat exchanger 14 as a low-temperature and low-pressure gas refrigerant.
  • the refrigerant that has flowed out of the heat source side heat exchanger 14 is again sucked into the compressor 11 via the refrigerant flow switching device 13 and the accumulator 16. Thereafter, this cycle is repeated.
  • the operation of the refrigeration cycle apparatus 100 ⁇ / b> A when the refrigerant shut-off device 54 is used will be described.
  • the refrigerant shut-off device 54 is controlled to be opened by the control device 70, and the refrigerant passes through the refrigerant shut-off device 54.
  • the refrigeration cycle apparatus 100A uses the refrigerant shut-off device 54 to improve the stand-up performance when resuming the cooling operation and the safety when refrigerant leaks.
  • FIG. 2 is a control flowchart showing the flow of processing when the cooling operation mode of the refrigeration cycle apparatus 100A is stopped.
  • the control device 70 continues the cooling operation mode until there is an instruction to stop the cooling operation (step 101: No). When there is an instruction to stop the cooling operation, the control device 70 stops the cooling operation mode (step 101: Yes).
  • the control device 70 stops driving the compressor 11 (step 102). Simultaneously with the stop of the compressor 11 or immediately after the stop of the compressor 11 (within the set time after the stop), the control device 70 closes the refrigerant shut-off device 54 (step 103).
  • the state of the immediately preceding cooling operation mode is maintained. That is, the refrigerant stays in the refrigerant pipe 4 from the check valve 12 of the outdoor unit 10 to the front side of the use side heat exchanger 51 of the indoor unit 50, and the pressure becomes high. Note that the set time from when the compressor 11 is stopped to when the refrigerant shut-off device 54 is closed is within 3 seconds.
  • the throttle means provided in the indoor unit is controlled to open when the compressor is stopped. That is, when the compressor is stopped, the pressure in the refrigerant circuit is equalized, and the liquid refrigerant is stored in an accumulator or the like. Therefore, at the start of the next cooling operation mode, it is necessary to expel the liquid refrigerant accumulated in the accumulator, and it takes time until the refrigeration cycle becomes stable.
  • the refrigerant shut-off device 54 is closed when the cooling operation mode is stopped, and the inside of the refrigerant pipe 4 is kept in a high pressure state. By doing so, it is not necessary to expel the liquid refrigerant accumulated in the accumulator 16 in the next cooling operation mode, and the time until a stable state is reached is shortened. Therefore, according to the refrigeration cycle apparatus 100A, the start-up property when the cooling operation mode is resumed is improved.
  • the control device 70 activates the compressor 11 simultaneously with the opening control of the refrigerant blocking device 54 or immediately after the opening control of the refrigerant blocking device 54 (within a set time after the opening control). The set time from when the refrigerant shut-off device 54 is controlled to open until the compressor 11 is started is within 3 seconds.
  • the compressor 11 since the compressor 11 is stopped, there is a concern that a reverse pressure is applied to the compressor 11, but compression is achieved by providing a check valve 12 between the compressor 11 and the refrigerant flow switching device 13. No back pressure is applied to the machine 11, and the compressor 11 can be protected.
  • the reverse pressure means that the discharge pressure of the compressor 11 becomes lower than the discharge pressure and the pressure difference is reversed.
  • the refrigeration cycle apparatus 100A is provided with a protection device.
  • the protection device includes a high-pressure escape device 52, a pressure detection means 55, and a bypass pipe 59A.
  • the pressure detecting means 55 is provided on the primary side of the refrigerant shut-off device 54 (upstream side of the refrigerant flow in the cooling operation mode).
  • the high pressure relief device 52 is provided in the bypass pipe 59A.
  • bypass pipe 59 ⁇ / b> A is configured to bypass the high-pressure refrigerant from the primary side of the refrigerant shut-off device 54 to the secondary side of the usage-side heat exchanger 51 (downstream side of the refrigerant flow in the cooling operation mode).
  • the high-pressure escape device 52 may be opened.
  • the set pressure may be determined by the design pressure and the error of the pressure detecting means 55.
  • the expansion device 53 may be substituted for the refrigerant shut-off device 54.
  • the valve opening time may be set to 20 seconds or less, for example.
  • FIG. 3 is a schematic configuration diagram illustrating a state in which the refrigerant leakage detection unit 57 is provided in the refrigeration cycle apparatus 100A.
  • FIG. 4 is a control flowchart showing the flow of processing when the refrigerant leaks in the cooling operation mode of the refrigeration cycle apparatus 100A.
  • FIG. 5 is a control flowchart showing a flow of processing at the time of refrigerant leakage in the heating operation mode of the refrigeration cycle apparatus 100A.
  • a flammable refrigerant hereinafter referred to as a flammable refrigerant
  • a flammable refrigerant examples include HFC refrigerant R32 (difluoromethane), hydrofluoroolefin refrigerant (HFO1234yf, HFO1234ze, etc.), mixed refrigerant with R32 and HFO, or R290 (propane) and R600a (isobutane).
  • HFC refrigerant R32 difluoromethane
  • mixed refrigerant with R32 and HFO or R290 (propane) and R600a (isobutane).
  • R290 propane
  • R600a isobutane
  • the refrigerant leak detection means 57 is provided in the indoor unit 50, and the refrigerant shut-off device 54 is closed when refrigerant leak is detected, so that the combustible refrigerant is not sent to the indoor unit 50. .
  • the refrigeration cycle apparatus 100 ⁇ / b> A includes a refrigerant leak detection unit 57 in the indoor unit 50.
  • the refrigerant leakage detection means 57 detects the refrigerant concentration in the air-conditioning target space.
  • the refrigerant leak detection means 57 can be configured by a concentration sensor.
  • the installation position of the refrigerant leakage detection means 57 is not particularly limited, it may be installed at a position where the possibility of refrigerant leakage is high. Information detected by the refrigerant leakage detection means 57 is sent to the control device 70 and compared with a reference value.
  • the control device 70 continues the cooling operation mode when the cooling is not leaking (step 201: No).
  • the control device 70 stops the cooling operation mode (step 201: Yes).
  • the detection of the refrigerant leakage is performed by comparing the detection information sent from the refrigerant leakage detection means 57 with a reference value. That is, the control device 70 compares the newly set reference value with the detection information sent from the refrigerant leakage detection means 57, and detects that the refrigerant is leaking if the detection information is greater than the reference value. If the information is below the reference value, it is not detected that the refrigerant is leaking.
  • the control device 70 stops driving the compressor 11 (step 202). Simultaneously with the stop of the compressor 11 or immediately after the stop of the compressor 11 (within a set time after the stop), the control device 70 closes the refrigerant shut-off device 54 (step 203). By closing the refrigerant shut-off device 54, the flow of the refrigerant is stopped and the inflow of the refrigerant into the indoor unit 50 can be prevented. Note that the set time from when the compressor 11 is stopped to when the refrigerant shut-off device 54 is closed is within 3 seconds.
  • the refrigerant shut-off device 54 is closed to stop the refrigerant flow. By doing so, it is possible to suppress expansion of refrigerant leakage occurring in the indoor unit 50. Therefore, according to the refrigeration cycle apparatus 100A, the safety at the time of refrigerant leakage is improved.
  • the compressor 11 can be protected by the check valve 12 similarly to the operation when the cooling operation mode is stopped. Further, bypassing the high-pressure refrigerant by the protective device is the same as the operation when the cooling operation mode is stopped. Further, the expansion device 53 may be used in place of the refrigerant blocking device 54 or may be used in combination with the refrigerant blocking device 54.
  • the configuration in which the refrigerant leak detection unit 57 is provided in the indoor unit 50 is illustrated as an example.
  • the refrigerant leak detection unit 57 is not provided, and the refrigerant leak detection is performed by the fluctuation of the pressure value detected by the pressure detection unit 55. You may make it detect.
  • the control device 70 may make it possible to notify the refrigerant leak detection when the refrigerant leak is detected.
  • FIG. 6 is a schematic configuration diagram showing another example of the refrigerant circuit configuration of the refrigeration cycle apparatus 100A.
  • the refrigerant flow in the cooling operation mode executed by the refrigeration cycle apparatus 100 ⁇ / b> A is indicated by a broken line arrow
  • the refrigerant flow in the heating operation mode is indicated by a solid arrow.
  • FIG. 1 and 3 show the configuration in which the pressure detection means 55 is provided in each of the indoor units 50, but FIG. 6 shows the configuration in which the pressure detection means 55 is provided in the outdoor unit 10.
  • one pressure detection means 55 can be commonly used in the plurality of indoor units 50. Therefore, the number of pressure detection means 55 can be reduced.
  • the controller 70 closes either the refrigerant shut-off device 54a or the refrigerant shut-off device 54b, if the pressure detected by the pressure detecting means 55 is equal to or higher than the set pressure, the corresponding high-pressure escape device 52 is It should be opened.
  • the set pressure may be determined by the design pressure, the error of the pressure detection means 55, and the head difference.
  • the refrigeration cycle apparatus 100A includes the compressor 11, the check valve 12, the heat source side heat exchanger 14 that is the first heat exchanger, the refrigerant shut-off device 54, the expansion device 53, and the second heat exchanger.
  • the control device 70 that controls the operation of the compressor 11, the refrigerant shut-off device 54, and the high-pressure escape device 52 is provided. When the control device 70 stops the operation, the drive of the compressor 11 is stopped and the compressor 11 is stopped. At the same time or immediately after the compressor 11 is stopped, the refrigerant shut-off device 54 is closed.
  • the refrigerant shut-off device 54 when the operation is stopped (for example, when the cooling operation mode is stopped or when the operation is stopped when the refrigerant leakage is detected), the refrigerant shut-off device 54 is closed and the check valve 12 to the refrigerant shut-off device 54 are closed.
  • the inside of the refrigerant pipe 4 can be maintained at a high pressure. In this way, if the cooling operation mode is stopped, the time until the next cooling operation mode becomes stable is shortened. That is, according to the refrigeration cycle apparatus 100A, the start-up property when the cooling operation mode is resumed is improved. Further, if the operation is stopped when the refrigerant leaks, the flow of the refrigerant can be stopped. That is, according to the refrigeration cycle apparatus 100A, the expansion of refrigerant leakage at the time of refrigerant leakage can be suppressed, and safety is improved.
  • the compressor 11, the check valve 12, and the heat source side heat exchanger 14 are accommodated in the outdoor unit 10 that is a heat source unit, and the refrigerant shut-off device 54, the expansion device 53, and the use side heat exchanger 51.
  • the high-pressure escape device 52 and the bypass pipe 59A are accommodated in the indoor unit 50 that is the use side unit. Therefore, according to the refrigeration cycle apparatus 100A, the configuration of the refrigerant circuit does not have to be complicated.
  • the refrigeration cycle apparatus 100A opens the high-pressure escape device 52 when the pressure of the refrigerant from the check valve 12 to the refrigerant shut-off device 54 becomes equal to or higher than the set pressure after the control device 70 closes the refrigerant shut-off device 54. I have to. Therefore, according to the refrigeration cycle apparatus 100A, the safety is improved while ensuring the startability when the cooling operation mode is resumed.
  • the opening time of the high-pressure escape device 52 is set by the Cv value of the high-pressure escape device 52, so that the responsiveness is fast and the pressure in the closed circuit when the refrigerant shut-off device 54 is closed. It is possible to cope with a sudden rise and further contribute to safety.
  • the refrigeration cycle apparatus 100A is provided with the refrigerant flow switching device 13 on the discharge side of the compressor 11, uses a combustible refrigerant as the refrigerant that circulates through the refrigerant circuit, and uses the heat on the use side when the control device 70 detects refrigerant leakage.
  • the operation in which the exchanger 51 acts as an evaporator or a condenser is stopped. Therefore, in the refrigeration cycle apparatus 100A, the refrigerant shut-off device 54 can be closed to stop the refrigerant flow when the refrigerant leaks during the cooling operation or the heating operation, and the expansion of the refrigerant leakage can be suppressed. .
  • the refrigerant leakage detection means 57 that detects the concentration of the flammable refrigerant in the air-conditioning target space (for example, the space where the indoor unit 50 is installed) is provided. Can respond.
  • the compressor 11 when the control device 70 resumes operation, at the same time as the opening control of the refrigerant blocking device 54, or immediately after the opening control of the refrigerant blocking device 54 (within the set time after the opening control), the compressor 11 Will be restarted quickly.
  • FIG. FIG. 7 is a schematic configuration diagram showing an example of a refrigerant circuit configuration of a refrigeration cycle apparatus (hereinafter referred to as refrigeration cycle apparatus 100B) according to Embodiment 2 of the present invention.
  • the refrigeration cycle apparatus 100B will be described based on FIG.
  • the refrigeration cycle apparatus 100B is an example of a refrigeration cycle apparatus according to the present invention, and is configured to be capable of heating or cooling an air-conditioning target space.
  • the refrigerant flow in the cooling operation mode executed by the refrigeration cycle apparatus 100 ⁇ / b> B is indicated by a broken line arrow, and the refrigerant flow in the heating operation mode is indicated by a solid arrow.
  • the second embodiment will be described with a focus on differences from the first embodiment, and the same parts as those of the first embodiment will be denoted by the same reference numerals and the description thereof will be omitted.
  • the outdoor unit 10 includes the refrigerant shut-off device 54 and the protection device.
  • the protection device includes the high-pressure escape device 52, the pressure detection means 55, and the bypass pipe 59B.
  • the bypass pipe 59B is provided so as to bypass the use side heat exchanger 51 by connecting the heat source side heat exchanger 14 and the expansion device 53 in the outdoor unit 10 to the upstream side of the accumulator 16. It has been.
  • the refrigerant shut-off device 54 is provided in the outdoor unit 10 on the upstream side of the expansion device 53 in the refrigerant flow in the cooling operation mode.
  • the pressure detection means 55 is provided in the outdoor unit 10 between the heat source side heat exchanger 14 and the refrigerant shut-off device 54.
  • the high pressure relief device 52 is provided in the bypass pipe 59B.
  • the control device 70 continues the cooling operation mode until an instruction to stop the cooling operation is given.
  • the control device 70 stops the cooling operation mode.
  • the control device 70 stops driving the compressor 11.
  • the control device 70 closes the refrigerant shut-off device 54. By closing the refrigerant shut-off device 54, the state of the immediately preceding cooling operation mode is maintained. That is, the refrigerant stays in the refrigerant pipe 4 from the check valve 12 of the outdoor unit 10 to the front side of the use side heat exchanger 51 of the indoor unit 50, and the pressure becomes high.
  • the time lag from when the compressor 11 is stopped until the refrigerant shut-off device 54 is closed is within 3 seconds.
  • the check valve 12 to the refrigerant shut-off device 54 form a closed circuit.
  • the pressure detected by the pressure detection means 55 is equal to or higher than a set pressure (for example, 4.05 MPa)
  • the high-pressure escape device 52 may be opened.
  • the control device 70 starts the compressor 11 simultaneously with the opening control of the refrigerant blocking device 54 or within a set time after the opening control of the refrigerant blocking device 54. Further, the operation at the time of refrigerant leakage is the same as that of the first embodiment.
  • the compressor 11, the check valve 12, the heat source side heat exchanger 14, the refrigerant shut-off device 54, the high-pressure escape device 52, and the bypass pipe 59B are accommodated in the outdoor unit 10 that is a heat source unit.
  • the expansion device 53 and the use side heat exchanger 51 are accommodated in an indoor unit 50 that is a use side unit. Therefore, according to the refrigeration cycle apparatus 100B, it is not necessary to complicate the configuration of the refrigerant circuit in order to improve the startability when the cooling operation mode is resumed.
  • refrigerant piping 10 outdoor unit, 11 compressor, 12 check valve, 13 refrigerant flow switching device, 14 heat source side heat exchanger, 15 outdoor fan, 16 accumulator, 50 indoor unit, 50a indoor unit, 50b indoor unit, 51: Use side heat exchanger, 52: High pressure relief device, 53: Throttling device, 54: Refrigerant shutoff device, 54a: Refrigerant shutoff device, 54b: Refrigerant shutoff device, 55: Pressure detection means, 56: Indoor fan, 57: Refrigerant leak detection means, 59A bypass piping, 59B bypass piping, 70 control device, 100A refrigeration cycle device, 100B refrigeration cycle device.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

L'invention concerne un dispositif à cycle de réfrigération dans lequel des propriétés de démarrage lors du redémarrage d'une opération de refroidissement peuvent être améliorées et la sécurité peut être améliorée pendant des fuites de réfrigérant. Ce dispositif à cycle de réfrigération (100A) comprend un circuit de réfrigérant dans lequel un compresseur (11), un clapet de non-retour (12), un premier échangeur de chaleur (14), un dispositif d'arrêt de réfrigérant (54), un dispositif d'étranglement (53), et un second échangeur de chaleur (51) sont reliés dans l'ordre par une tuyauterie de réfrigérant (4), et un circuit de dérivation dans lequel une entrée de réfrigérant et une sortie de réfrigérant du second échangeur de chaleur sont reliées par l'intermédiaire d'un dispositif de décompression haute pression (52) avec une tuyauterie de dérivation (59A). Le dispositif à cycle de réfrigération est aussi pourvu d'un dispositif de commande (70) qui commande le fonctionnement du compresseur, du dispositif d'arrêt du réfrigérant et du dispositif de détente haute pression, et lorsque le fonctionnement est arrêté, le dispositif de commande arrête l'entraînement du compresseur et ferme le dispositif d'arrêt de réfrigérant simultanément à l'arrêt du compresseur ou durant un temps défini après l'arrêt du compresseur.
PCT/JP2016/075197 2016-08-29 2016-08-29 Dispositif à cycle de réfrigération Ceased WO2018042490A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2016/075197 WO2018042490A1 (fr) 2016-08-29 2016-08-29 Dispositif à cycle de réfrigération

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2016/075197 WO2018042490A1 (fr) 2016-08-29 2016-08-29 Dispositif à cycle de réfrigération

Publications (1)

Publication Number Publication Date
WO2018042490A1 true WO2018042490A1 (fr) 2018-03-08

Family

ID=61300341

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2016/075197 Ceased WO2018042490A1 (fr) 2016-08-29 2016-08-29 Dispositif à cycle de réfrigération

Country Status (1)

Country Link
WO (1) WO2018042490A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114008393A (zh) * 2019-07-01 2022-02-01 三菱电机株式会社 空调装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53157461U (fr) * 1977-05-18 1978-12-09
JPH0626716A (ja) * 1992-04-21 1994-02-04 Daikin Ind Ltd 空気調和装置の運転制御装置
JPH0885454A (ja) * 1994-07-22 1996-04-02 Nippondenso Co Ltd 電車用空調装置
JP2010048534A (ja) * 2008-08-25 2010-03-04 Hitachi Appliances Inc 空気調和機
WO2016088167A1 (fr) * 2014-12-01 2016-06-09 三菱電機株式会社 Dispositif de conditionnement d'air

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53157461U (fr) * 1977-05-18 1978-12-09
JPH0626716A (ja) * 1992-04-21 1994-02-04 Daikin Ind Ltd 空気調和装置の運転制御装置
JPH0885454A (ja) * 1994-07-22 1996-04-02 Nippondenso Co Ltd 電車用空調装置
JP2010048534A (ja) * 2008-08-25 2010-03-04 Hitachi Appliances Inc 空気調和機
WO2016088167A1 (fr) * 2014-12-01 2016-06-09 三菱電機株式会社 Dispositif de conditionnement d'air

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114008393A (zh) * 2019-07-01 2022-02-01 三菱电机株式会社 空调装置
CN114008393B (zh) * 2019-07-01 2023-08-22 三菱电机株式会社 空调装置

Similar Documents

Publication Publication Date Title
JP6269756B1 (ja) 冷凍装置
CN111164360B (zh) 空气调节装置
JP5784117B2 (ja) 空気調和装置
US20110185754A1 (en) Air-conditioning apparatus
JP5642202B2 (ja) 空気調和装置
CN104838218B (zh) 空调装置
US8794020B2 (en) Air-conditioning apparatus
JP5855279B2 (ja) 空気調和装置
JPWO2016009748A1 (ja) 空気調和装置
WO2012098584A1 (fr) Appareil de conditionnement d'air
US9897359B2 (en) Air-conditioning apparatus
CN103210262A (zh) 空气调节装置
WO2011064827A1 (fr) Dispositif de climatisation
US10852007B2 (en) Heat pump device
WO2012172605A1 (fr) Climatiseur
JP5959716B2 (ja) 空気調和装置
EP3121539B1 (fr) Dispositif à cycle de réfrigération
WO2011064830A1 (fr) Dispositif de climatisation
US20240219064A1 (en) Air-conditioning apparatus and method for installing air-conditioning apparatus
WO2018042490A1 (fr) Dispositif à cycle de réfrigération
JPWO2019026276A1 (ja) 冷凍サイクル装置
WO2017195294A1 (fr) Dispositif à cycle frigorifique
WO2023119552A1 (fr) Climatiseur
WO2012160605A1 (fr) Dispositif climatiseur

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 16915051

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

NENP Non-entry into the national phase

Ref country code: JP

122 Ep: pct application non-entry in european phase

Ref document number: 16915051

Country of ref document: EP

Kind code of ref document: A1