WO2021095134A1 - Unité extérieure et dispositif de climatisation - Google Patents

Unité extérieure et dispositif de climatisation Download PDF

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Publication number
WO2021095134A1
WO2021095134A1 PCT/JP2019/044401 JP2019044401W WO2021095134A1 WO 2021095134 A1 WO2021095134 A1 WO 2021095134A1 JP 2019044401 W JP2019044401 W JP 2019044401W WO 2021095134 A1 WO2021095134 A1 WO 2021095134A1
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Prior art keywords
pressure
flow path
pipe
refrigerant
pressure chamber
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PCT/JP2019/044401
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English (en)
Japanese (ja)
Inventor
悟 梁池
篤史 岐部
傑 鳩村
直渡 原
Original Assignee
三菱電機株式会社
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Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to JP2021555669A priority Critical patent/JP7150194B2/ja
Priority to PCT/JP2019/044401 priority patent/WO2021095134A1/fr
Publication of WO2021095134A1 publication Critical patent/WO2021095134A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
    • F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
    • F16K11/06—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements
    • F16K11/065—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only sliding valves, i.e. sliding closure elements with linearly sliding closure members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
    • F16K31/42—Actuating devices; Operating means; Releasing devices actuated by fluid by means of electrically-actuated members in the supply or discharge conduits of the fluid motor
    • 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 an outdoor unit and an air conditioner.
  • an air conditioner equipped with two four-way valves arranged in series has been known.
  • the air conditioner described in Patent Document 1 uses a non-azeotropic mixed refrigerant in which two or more types of refrigerants having different boiling points are mixed at a predetermined ratio, and uses a compressor, a four-way valve, a condenser, and a decompressor. , Consists of a refrigeration cycle in which evaporators are sequentially connected.
  • the indoor heat exchanger is switched to the condenser or evaporator by switching the refrigerant discharged from the compressor to the indoor heat exchanger or outdoor heat exchanger by the first four-way valve.
  • the refrigerant and air exchange heat by sending air in a certain direction to the indoor heat exchanger and the outdoor heat exchanger, respectively, by a fan.
  • a second four-way valve By inserting a second four-way valve into the inlet and outlet of the indoor heat exchanger, the direction of the refrigerant flow in the indoor heat exchanger is constant regardless of heating and cooling, and the direction of the refrigerant flow is so-called opposite to the wind direction. Make it countercurrent.
  • Patent Document 1 has a problem that the flow paths of the two four-way valves cannot be smoothly switched.
  • an object of the present invention is to provide an outdoor unit and an air conditioner capable of smoothly switching the flow paths of two four-way valves arranged in series.
  • the outdoor unit of the present invention includes a compressor that compresses and discharges a refrigerant, a heat source side heat exchanger that exchanges heat between the refrigerant and the outside air, and a first high-pressure connection pipe that is connected to the discharge side of the compressor.
  • a low-pressure connecting pipe connected to the suction side of the compressor, a first flow path switching device connected to the discharge side of the compressor, and a second flow path switching device connected to the first flow path switching device.
  • the second flow path switching device includes a main valve, a pilot valve, and a first communication pipe and a second communication pipe that communicate the main valve and the pilot valve.
  • the main valve includes a first container, a piston arranged in the first container, and a first switching pipe, a second switching pipe, a third switching pipe, and a fourth switching pipe communicating with the first container.
  • the piston includes a first partition portion and a second partition portion, a connecting portion connecting the first partition portion and the second partition portion, and a first valve body portion provided in the connecting portion.
  • the first partition is when the pressure in the first pressure chamber between the first partition and one end of the first container is higher than the pressure in the space between the first partition and the second partition.
  • the second partition includes a first bypass structure for bypassing the refrigerant from the first pressure chamber to the space, and the pressure of the second pressure chamber between the second partition and the other end of the first container is the space.
  • a second bypass structure for bypassing the refrigerant from the second pressure chamber to the space.
  • the first communication pipe communicates with the first pressure chamber, and the second communication pipe communicates with the second pressure chamber.
  • the pilot valve communicates one of the first high-pressure connection pipe and the low-pressure connection pipe with the first communication pipe during the cooling operation, and communicates the other of the first high-pressure connection pipe and the low-pressure connection pipe with the second communication pipe during the heating operation. Communicate with the pipe.
  • the outdoor unit includes a flow path resistance variable mechanism for changing the resistance of the flow path of the refrigerant to the first pressure chamber and the second pressure chamber.
  • the flow paths of two four-way valves arranged in series can be smoothly switched.
  • FIG. 3 is a diagram showing the configuration of the air conditioner 100 according to the first embodiment and the flow of the refrigerant in the full heating operation mode. It is a figure which shows the structure of the air conditioner 100 which concerns on Embodiment 1, and the flow of a refrigerant in a heating main operation mode.
  • FIG. 1 It is a figure for demonstrating the state of the 2nd flow path switching device 14 when the air conditioner 100 is switched from a total heating mode or a heating main mode to a total cooling mode or a cooling main mode. It is a figure which shows the flow path resistance variable structure of Embodiment 1. It is a flowchart which shows the control procedure of the solenoid valve 51 of Embodiment 1. FIG. It is a figure which shows the structure of the air conditioner 100 which concerns on Embodiment 2, and the flow of the refrigerant in the total cooling operation mode. It is a figure which shows the flow path resistance variable structure of Embodiment 2. It is a flowchart which shows the control procedure of the solenoid valve 61, 62 of Embodiment 2.
  • FIG. 1 is a diagram showing the configuration of the air conditioner 100 according to the first embodiment and the flow of the refrigerant in the total cooling operation mode.
  • the air conditioner 100 includes one outdoor unit 1 which is a heat source unit, a plurality of indoor units 2a to 2d (hereinafter, subscripts may be omitted and may be referred to as an indoor unit 2), and an outdoor unit 1. It is provided with a relay device 3 provided between the plurality of indoor units 2a to 2d.
  • the outdoor unit 1 and the relay device 3 are connected by two outflow pipes 5b and an inflow pipe 5a through which the refrigerant flows.
  • the relay device 3 and each of the plurality of indoor units 2a to 2d are connected by a plurality of branch pipes 8a and branch pipes 8b through which the refrigerant flows.
  • the cold heat or heat generated by the outdoor unit 1 is supplied to the plurality of indoor units 2a to 2d via the relay device 3.
  • the outflow pipe 5b and the inflow pipe 5a are connected between the outdoor unit 1 and the relay device 3.
  • the pressure of the refrigerant flowing through the outflow pipe 5b is higher than the pressure of the refrigerant flowing through the inflow pipe 5a.
  • the relay device 3 and each of the plurality of indoor units 2a to 2d are connected by a branch pipe 8a and a branch pipe 8b. In this way, the air conditioner 100 can be installed by connecting the outdoor unit 1 and the relay device 3 and the relay device 3 and the plurality of indoor units 2a to 2d by two refrigerant pipes, respectively. Easy to do.
  • the outdoor unit 1 includes a compressor 10, a heat source side heat exchanger 12, a heat source side blower 18, a first flow path switching device 13, a second flow path switching device 14, an accumulator 19, a control device 60, and a high pressure. It has connecting pipes 131a and 131b and low-pressure connecting pipes 132a and 132b.
  • the compressor 10 compresses and discharges the refrigerant.
  • the heat source side blower 18 supplies outside air to the heat source side heat exchanger 12.
  • the heat source side heat exchanger 12 exchanges heat between the refrigerant and the outside air.
  • the air supplied by the heat source side blower 18 is heat exchanged with the refrigerant, and the refrigerant is condensed or evaporated.
  • the first flow path switching device 13 and the second flow path switching device 14 switch the flow path of the refrigerant according to the operation mode.
  • the first flow path switching device 13 is connected to the discharge side of the compressor 10.
  • the second flow path switching device 14 is connected to the first flow path switching device 13.
  • the high-pressure connection pipe 131a is connected to the discharge side of the compressor 10 and the first flow path switching device 13.
  • the high-pressure connection pipe 131b is connected to the discharge side of the compressor 10 and the second flow path switching device 14.
  • the low pressure connection pipe 132a is connected to the suction side of the compressor 10 and the first flow path switching device 13.
  • the low-pressure connecting pipe 132b is connected to the suction side of the compressor 10 and the second flow path switching device 14.
  • the first flow path switching device 13 includes a first flow path 13a, a second flow path 13b, a third flow path 13c, and a fourth flow path 13d that can be freely opened.
  • the second flow path switching device 14 includes a first flow path 14a, a second flow path 14b, a third flow path 14c, and a fourth flow path 14d that can be opened freely.
  • the accumulator 19 stores the refrigerant.
  • the control device 60 controls the equipment in the outdoor unit 1.
  • the compressor 10 and the first flow path switching device 13 are connected by a refrigerant pipe 4.
  • the first flow path switching device 13 and the second flow path switching device 14 are connected by a refrigerant pipe 4.
  • the first flow path switching device 13 and the outflow pipe 5b are connected by a refrigerant pipe 4.
  • the inflow pipe 5a and the second flow path switching device 14 are connected by a refrigerant pipe 4.
  • the first flow path switching device 13 and the heat source side heat exchanger 12 are connected by a refrigerant pipe 4.
  • the heat source side heat exchanger 12 and the second flow path switching device 14 are connected by a refrigerant pipe 5.
  • the outdoor unit 1 further includes a discharge temperature sensor 43, a discharge pressure sensor 40, and an outside air temperature sensor 46.
  • the discharge temperature sensor 43 detects the temperature of the refrigerant discharged by the compressor 10 and outputs a discharge temperature detection signal.
  • the discharge pressure sensor 40 detects the pressure of the refrigerant discharged by the compressor 10 and outputs a discharge pressure detection signal.
  • the outside air temperature sensor 46 is installed in the air inflow portion of the heat source side heat exchanger 12. The outside air temperature sensor 46 detects, for example, the outside air temperature, which is the ambient temperature of the outdoor unit 1, and outputs an outside air temperature detection signal.
  • the relay device 3 and the outdoor unit 1 form a refrigerant circuit 101.
  • the relay device 3 includes a gas-liquid separator 29, a first relay throttle device 30, and a second relay throttle device 27.
  • the relay device 3 includes a plurality of first switchgear devices 23a to 23d, a plurality of second switchgear devices 24a to 24d, a plurality of first backflow prevention devices 21a to 21d, and a plurality of second backflow prevention devices 22a to 22d. To be equipped.
  • the gas-liquid separator 29 separates the high-pressure gas-liquid two-phase state refrigerant generated by the outdoor unit 1 into a liquid refrigerant and a gas refrigerant in the cooling / heating mixed operation mode in which the cooling load is large.
  • the gas-liquid separator 29 supplies cold heat to a part of the indoor units 2 by flowing the separated liquid refrigerant into the lower pipe in the drawing.
  • the gas-liquid separator 29 supplies heat to some of the other indoor units 2 by allowing the separated gas refrigerant to flow into the upper pipe in the drawing.
  • the gas-liquid separator 29 is provided at the inlet of the relay device 3.
  • the first relay throttle device 30 has a function as a pressure reducing valve and an on / off valve.
  • the first relay throttle device 30 decompresses the liquid refrigerant to adjust the pressure to a predetermined pressure, and opens and closes the flow path of the liquid refrigerant.
  • the opening degree of the first relay throttle device 30 can be adjusted continuously or in multiple stages, for example.
  • an electronic expansion valve or the like is used as the first relay throttle device 30, for example.
  • the first relay throttle device 30 is provided in a pipe that allows the liquid refrigerant to flow out from the gas-liquid separator 29.
  • the second relay throttle device 27 has a function as a pressure reducing valve and an on / off valve.
  • the second relay throttle device 27 opens the refrigerant flow path in the full heating operation mode to allow the refrigerant to flow into the low-pressure pipe on the outlet side of the relay device 3.
  • the second relay throttle device 27 adjusts the bypass liquid flow rate according to the indoor load in the heating main operation mode.
  • the opening degree of the second relay throttle device 27 can be adjusted continuously or in multiple stages, for example.
  • an electronic expansion valve or the like is used as the second relay throttle device 27, for example.
  • Each of the plurality of first opening / closing devices 23a to 23d is provided corresponding to one of the plurality of indoor units 2a to 2d.
  • the plurality of first switchgear 23a to 23d open and close the flow paths of the high-temperature and high-pressure gas refrigerants supplied to the indoor units 2a to 2d, respectively.
  • the plurality of first switchgear 23a to 23d are composed of, for example, a solenoid valve.
  • the plurality of first switchgear 23a to 23d are connected to the gas side pipe of the gas-liquid separator 29, respectively.
  • the plurality of first switchgear 23a to 23d need only be able to open and close the flow path, and may be a diaphragm device having a fully closed function.
  • Each of the plurality of second switchgear 24a to 24d is provided corresponding to one of the plurality of indoor units 2a to 2d.
  • the plurality of second switchgear 24a to 24d open and close the flow paths of the low-pressure and low-temperature gas refrigerant flowing out from the indoor units 2a to 2d, respectively.
  • the plurality of second switchgear 24a to 24d are composed of, for example, a solenoid valve.
  • the plurality of second switchgear 24a to 24d are connected to low-voltage pipes conducting on the outlet side of the relay device 3, respectively.
  • the plurality of second switchgear 24a to 24d need only be able to open and close the flow path, and may be a diaphragm device having a fully closed function.
  • Each of the plurality of first backflow prevention devices 21a to 21d is provided corresponding to one of the plurality of indoor units 2a to 2d.
  • the plurality of first backflow prevention devices 21a to 21d allow the high-pressure liquid refrigerant to flow into the indoor unit 2 that is performing the cooling operation.
  • the plurality of first backflow prevention devices 21a to 21d are connected to the pipe on the outlet side of the first relay throttle device 30.
  • the plurality of first backflow prevention devices 21a to 21d are any of the load side throttle devices 25 (here, the load side throttle devices 25a to 25d) of the indoor unit 2 being heated in the cooling main operation mode and the heating main operation mode.
  • Each of the plurality of second backflow prevention devices 22a to 22d is provided corresponding to one of the plurality of indoor units 2a to 2d.
  • the plurality of second backflow prevention devices 22a to 22d allow the low-pressure gas refrigerant to flow in from the indoor unit 2 that is performing the heating operation.
  • the plurality of second backflow prevention devices 22a to 22d are connected to the pipe on the outlet side of the first relay throttle device 30.
  • the plurality of second backflow prevention devices 22a to 22d are in a medium-temperature, medium-pressure liquid or two-phase state in which the degree of supercooling from the first relay throttle device 30 is not sufficiently secured in the cooling main operation mode and the heating main operation mode.
  • a check valve is used as the plurality of second backflow prevention devices 22a to 22d.
  • the plurality of second backflow prevention devices 22a to 22d may be any as long as they can prevent the backflow of the refrigerant, and for example, a switchgear or a throttle device having a fully closed function may be used.
  • a pressure sensor 33 is provided on the inlet side of the first relay throttle device 30 in the relay device 3.
  • the pressure sensor 33 detects the pressure of the high-pressure refrigerant.
  • a pressure sensor 34 is provided on the outlet side of the first relay throttle device 30. The pressure sensor 34 detects the intermediate pressure of the liquid refrigerant on the outlet side of the first relay throttle device 30 in the cooling main operation mode.
  • the plurality of indoor units 2a to 2d are included in the refrigerant circuit 101.
  • the plurality of indoor units 2a to 2d have, for example, the same configuration as each other.
  • the indoor unit 2a has a load side heat exchanger 26a and a load side throttle device 25a.
  • the indoor unit 2b has a load side heat exchanger 26b and a load side throttle device 25b.
  • the indoor unit 2c has a load side heat exchanger 26c and a load side throttle device 25c.
  • the indoor unit 2d has a load side heat exchanger 26d and a load side throttle device 25d.
  • Each of the plurality of load-side heat exchangers 26a to 26d is connected to the relay device 3 connected by the refrigerant pipe 4 via the branch pipe 8a and the branch pipe 8b.
  • the air supplied by the load-side blower (not shown) is heat-exchanged with the refrigerant to generate cooling air or heating air to be supplied to the indoor space.
  • the opening degree of the plurality of load side throttle devices 25a to 25d can be adjusted continuously or in multiple steps, for example.
  • an electronic expansion valve or the like is used as the plurality of load-side throttle devices 25a to 25d.
  • the plurality of load-side throttle devices 25a to 25d have functions as a pressure reducing valve and an expansion valve.
  • the plurality of load-side throttle devices 25a to 25d decompress and expand the refrigerant.
  • the plurality of load-side throttle devices 25a to 25d are provided on the upstream side of each of the plurality of load-side heat exchangers 26a to 26d in the flow of the refrigerant in the full cooling operation mode.
  • the plurality of indoor units 2a to 2d have a plurality of temperature sensors 31a to 31d that detect the temperature of the refrigerant flowing into the load side heat exchangers 26a to 26d.
  • the plurality of indoor units 2a to 2d have a plurality of temperature sensors 32a to 32d that detect the temperature of the refrigerant flowing out from the load side heat exchangers 26a to 26d.
  • the plurality of temperature sensors 31a to 31d and the plurality of temperature sensors 32a to 32d are composed of, for example, a thermistor or the like.
  • Each of the plurality of temperature sensors 31a to 31d and the plurality of temperature sensors 32a to 32d outputs a detection signal to the control device 60.
  • the number of connected indoor units 2 may be 2, 3, or 5 or more.
  • the operation modes executed by the air conditioner 100 are roughly classified into a cooling operation mode and a heating operation mode.
  • the cooling operation mode includes a total cooling operation mode and a cooling main operation mode.
  • the total cooling operation mode is an operation mode in which all of the plurality of indoor units 2a to 2d that are not in the stopped state perform the cooling operation. That is, in the total cooling operation mode, all of the plurality of load side heat exchangers 26a to 26d that are not in the stopped state function as evaporators.
  • the cooling main operation mode is a cooling / heating mixed operation mode in which a part of the plurality of indoor units 2a to 2d performs a cooling operation and the other part of the plurality of indoor units 2a to 2d performs a heating operation, and the cooling load. Is an operation mode that is larger than the heating load.
  • a part of the plurality of load side heat exchangers 26a to 26d functions as an evaporator, and another part of the plurality of load side heat exchangers 26a to 26d functions as a condenser.
  • the heating operation mode includes a full heating operation mode and a heating main operation mode.
  • the full heating operation mode is an operation mode in which all of the plurality of indoor units 2a to 2d that are not in the stopped state perform the heating operation. That is, in the full heating operation mode, all of the plurality of load side heat exchangers 26a to 26d that are not in the stopped state function as condensers.
  • the heating-based operation mode is a mixed cooling / heating operation mode in which a part of the plurality of indoor units 2a to 2d performs a cooling operation and the other part of the plurality of indoor units 2a to 2d performs a heating operation. Is an operation mode that is larger than the cooling load.
  • a part of the plurality of load side heat exchangers 26a to 26d functions as an evaporator, and another part of the plurality of load side heat exchangers 26a to 26d functions as a condenser.
  • the flow direction of the refrigerant in the total cooling operation mode is indicated by a solid arrow.
  • the cold heat load is generated only in the load side heat exchanger 26a and the load side heat exchanger 26b.
  • the control device 60 uses the first flow path switching device 13 and the second flow path of the outdoor unit 1 so that the refrigerant discharged from the compressor 10 flows into the heat source side heat exchanger 12. The switching device 14 is switched.
  • the first flow paths 13a and 14a and the second flow paths 13b and 14b of the first flow path switching device 13 and the second flow path switching device 14 are switched to open, and the first flow path switching device 14 and the second flow path switching device 14 are switched to open.
  • the third flow paths 13c and 14c and the fourth flow paths 13d and 14d of the flow path switching device 13 and the second flow path switching device 14 are switched to closed.
  • the refrigerant discharged from the compressor 10 circulates in this order between the first flow path 13a of the first flow path switching device 13 and the heat source side heat exchanger 12, and then the second flow path switching device 14.
  • the first flow path 14a, the second flow path 13b of the first flow path switching device 13, and the outflow pipe 5b circulate in this order and flow into the relay device 3.
  • the refrigerant flowing out from the relay device 3 flows through the inflow pipe 5a, then flows through the second flow path 14b of the second flow path switching device 14, and the accumulator 19 and flows into the compressor 10.
  • the low-temperature and low-pressure refrigerant is compressed by the compressor 10 and discharged as a high-temperature and high-pressure gas refrigerant.
  • the high-temperature and high-pressure gas refrigerant discharged from the compressor 10 flows into the heat source side heat exchanger 12 via the first flow path 13a of the first flow path switching device 13. Then, the refrigerant flowing into the heat source side heat exchanger 12 becomes a high-pressure liquid refrigerant while radiating heat to the outdoor air.
  • the high-pressure liquid refrigerant flowing out from the heat source side heat exchanger 12 flows out from the outdoor unit 1 through the first flow path 14a of the second flow path switching device 14 and the second flow path 13b of the first flow path switching device 13. , Flows into the relay device 3 through the outflow pipe 5b.
  • the high-pressure liquid refrigerant flowing into the relay device 3 passes through the gas-liquid separator 29 and the first relay throttle device 30, and most of them pass through the first backflow prevention devices 21a and 21b and the branch pipe 8b, and the load side throttle device. It is expanded at 25a and 25b to become a low-temperature low-pressure gas-liquid two-phase state refrigerant.
  • the gas-liquid two-phase state refrigerant expanded by the load-side throttle devices 25a and 25b flows into the load-side heat exchangers 26a and 26b, which act as evaporators, respectively, and absorbs heat from the room air to absorb the room air. It becomes a low-temperature low-pressure gas refrigerant while cooling.
  • the opening degree of the load side throttle device 25a is controlled so that the superheat (superheat degree) obtained as the difference between the temperature detected by the temperature sensor 31a and the temperature detected by the temperature sensor 32a becomes constant.
  • the opening degree of the load-side throttle device 25b is controlled so that the super heat obtained as the difference between the temperature detected by the temperature sensor 31b and the temperature detected by the temperature sensor 32b becomes constant.
  • the load-side throttle device 25c and the load-side throttle device 25d which have no heat load, it is not necessary to flow the refrigerant, and the corresponding load-side throttle device 25c and load-side throttle device 25d are closed. There is.
  • the load side throttle device 25c or the load side throttle device 25d is opened and the refrigerant circulates.
  • the opening degree of the load-side throttle device 25c or the load-side throttle device 25d is controlled in the same manner as the load-side throttle device 25a or the load-side throttle device 25b.
  • the superheat (superheat degree) obtained as the difference between the temperature detected by the temperature sensor 31c or 31d and the temperature detected by the temperature sensor 32c or 32d is made constant.
  • FIG. 2 is a diagram showing the configuration of the air conditioner 100 according to the first embodiment and the flow of the refrigerant in the cooling main operation mode.
  • the flow direction of the refrigerant is indicated by a solid arrow.
  • the control device 60 has the first flow path switching device 13 and the first flow path switching device 13 so that the refrigerant discharged from the compressor 10 flows into the heat source side heat exchanger 12 as in the total cooling operation mode.
  • the two flow path switching device 14 is switched.
  • the switching state of the first flow path switching device 13 and the second flow path switching device 14 is the same as that of the total cooling operation mode.
  • the low-temperature and low-pressure refrigerant is compressed by the compressor 10 and discharged as a high-temperature and high-pressure gas refrigerant.
  • the high-temperature and high-pressure gas refrigerant discharged from the compressor 10 flows into the heat source side heat exchanger 12 via the first flow path 13a of the first flow path switching device 13.
  • the refrigerant flowing into the heat source side heat exchanger 12 becomes a gas-liquid two-phase state refrigerant while radiating heat to the outdoor air.
  • the refrigerant flowing out from the heat source side heat exchanger 12 flows through the second flow path 13b of the first flow path switching device 13 and the first flow path 14a of the second flow path switching device 14, and relays through the outflow pipe 5b. It flows into the device 3.
  • the gas-liquid two-phase state refrigerant that has flowed into the relay device 3 is separated into a high-pressure gas refrigerant and a high-pressure liquid refrigerant by the gas-liquid separator 29.
  • the high-pressure gas refrigerant flows into the load-side heat exchanger 26b, which acts as a condenser, after passing through the first switchgear 23b and the branch pipe 8a.
  • the high-pressure gas refrigerant heats the indoor air and becomes a liquid refrigerant by dissipating heat to the indoor air.
  • the opening degree of the load side throttle device 25b is a subcool (supercooling degree) obtained as the difference between the value obtained by converting the pressure detected by the pressure sensor 33 into the saturation temperature and the temperature detected by the temperature sensor 31b. It is controlled to be constant.
  • the liquid refrigerant flowing out of the load-side heat exchanger 26b is expanded by the load-side throttle device 25b and flows through the branch pipe 8b and the second backflow prevention device 22b.
  • the opening degree of the first relay throttle device 30 is such that the pressure difference between the pressure detected by the pressure sensor 33 and the pressure detected by the pressure sensor 34 is a predetermined pressure difference (for example, 0.3 MPb). Is controlled to be.
  • the combined liquid refrigerant is expanded by the load side throttle device 25a via the first backflow prevention device 21a and the branch pipe 8b, and becomes a low-temperature low-pressure gas-liquid two-phase state refrigerant.
  • the gas-liquid two-phase state refrigerant expanded by the load-side throttle device 25a of the indoor unit 2a flows into the load-side heat exchanger 26a that acts as an evaporator, and cools the room air by absorbing heat from the room air. However, it becomes a low-temperature and low-pressure gas refrigerant.
  • the opening degree of the load side throttle device 25a is controlled so that the superheat (superheat degree) obtained as the difference between the temperature detected by the temperature sensor 31a and the temperature detected by the temperature sensor 32b becomes constant.
  • the gas refrigerant flowing out from the load side heat exchanger 26a flows out from the relay device 3 via the branch pipe 8a and the second switchgear 24a.
  • the refrigerant flowing out of the relay device 3 flows into the outdoor unit 1 again through the inflow pipe 5a.
  • the refrigerant that has flowed into the outdoor unit 1 passes through the second flow path 14b of the second flow path switching device 14, passes through the accumulator 19, and is sucked into the compressor 10 again.
  • the load-side throttle device 25c and the load-side throttle device 25d which have no heat load, it is not necessary to flow the refrigerant, and the corresponding load-side throttle device 25c and load-side throttle device 25d are closed. ing.
  • the load side throttle device 25c or the load side throttle device 25d is opened and the refrigerant circulates.
  • the opening degree of the load-side throttle device 25c or the load-side throttle device 25d is controlled so that the superheat (superheat degree) becomes constant, similarly to the load-side throttle device 25a or the load-side throttle device 25b.
  • the super heat is the difference between the temperature detected by the temperature sensor 31c or 31d and the temperature detected by the temperature sensor 32c or 32d.
  • FIG. 3 is a diagram showing the configuration of the air conditioner 100 according to the first embodiment and the flow of the refrigerant in the full heating operation mode.
  • the flow direction of the refrigerant is indicated by a solid arrow.
  • the control device 60 has the first flow path switching device 13 and the control device 60 so that the refrigerant discharged from the compressor 10 flows into the relay device 3 without passing through the heat source side heat exchanger 12.
  • the second flow path switching device 14 is switched.
  • the third flow paths 13c and 14c and the fourth flow paths 13d and 14d of the first flow path switching device 13 and the second flow path switching device 14 are switched to open, and the first The first flow paths 13a and 14a and the second flow paths 13b and 14b of the flow path switching device 13 and the second flow path switching device 14 are switched to closed.
  • the refrigerant discharged from the compressor 10 flows through the third flow path 13c of the first flow path switching device 13 and then flows through the outflow pipe 5b and flows into the relay device 3.
  • the refrigerant flowing out from the relay device 3 flows through the inflow pipe 5a, and then the third flow path 14c of the second flow path switching device 14, the heat source side heat exchanger 12, and the fourth flow path switching device 13 of the first flow path switching device 13.
  • the flow path 13d, the fourth flow path 14d of the second flow path switching device 14, and the accumulator 19 flow in this order and flow into the compressor 10.
  • the low-temperature and low-pressure refrigerant is compressed by the compressor 10 and discharged as a high-temperature and high-pressure gas refrigerant.
  • the high-temperature and high-pressure gas refrigerant discharged from the compressor 10 passes through the third flow path 13c of the first flow path switching device 13 and flows out from the outdoor unit 1.
  • the high-temperature and high-pressure gas refrigerant flowing out of the outdoor unit 1 flows into the relay device 3 through the outflow pipe 5b.
  • the high-temperature and high-pressure gas refrigerant that has flowed into the relay device 3 passes through the gas-liquid separator 29, the first switchgear 23a and 23b, and the branch pipe 8a, and then acts as a condenser on the load side heat exchanger 26a and the load side heat. It flows into each of the exchangers 26b.
  • the refrigerant flowing into the load-side heat exchanger 26a and the load-side heat exchanger 26b dissipates heat to the indoor air to become a liquid refrigerant while heating the indoor air.
  • the liquid refrigerant flowing out from the load-side heat exchanger 26a and the load-side heat exchanger 26b is expanded by the load-side throttle devices 25a and 25b, respectively.
  • the opening degree of the load side throttle device 25a is a subcool (supercooling degree) obtained as the difference between the value obtained by converting the pressure detected by the pressure sensor 33 into the saturation temperature and the temperature detected by the temperature sensor 31a. It is controlled to be constant.
  • the opening degree of the load side throttle device 25b is a subcool (supercooling degree) obtained as the difference between the value obtained by converting the pressure detected by the pressure sensor 33 into the saturation temperature and the temperature detected by the temperature sensor 31b. It is controlled to be constant.
  • the refrigerant flowing into the outdoor unit 1 passes through the third flow path 14c of the second flow path switching device 14, becomes a low-temperature low-pressure gas refrigerant while absorbing heat from the outdoor air by the heat source side heat exchanger 12, and becomes the first flow. It is sucked into the compressor 10 again via the fourth flow path 13d of the path switching device 13, the fourth flow path 14d of the second flow path switching device 14, and the accumulator 19.
  • the load-side throttle device 25c and the load-side throttle device 25d which have no heat load, it is not necessary to flow the refrigerant, and the load-side throttle device 25c and the load-side throttle device 25d corresponding to each are closed. ..
  • the load side throttle device 25c or the load side throttle device 25d is opened and the refrigerant circulates.
  • the opening degree of the load-side throttle device 25c or the load-side throttle device 25d is the same as that of the load-side throttle device 25a or the load-side throttle device 25b described above, and the pressure detected by the pressure sensor 33 is converted into the saturation temperature.
  • the subcool (degree of supercooling) obtained as the difference between the value and the temperature detected by the temperature sensors 31c and 31d is controlled to be constant.
  • FIG. 4 is a diagram showing the configuration of the air conditioner 100 according to the first embodiment and the flow of the refrigerant in the heating main operation mode.
  • the flow direction of the refrigerant is indicated by a solid arrow.
  • the control device 60 causes the heat source side refrigerant discharged from the compressor 10 to flow into the relay device 3 without passing through the heat source side heat exchanger 12 as in the total heating mode.
  • the first flow path switching device 13 and the second flow path switching device 14 are switched.
  • the low temperature and low pressure refrigerant is compressed by the compressor 10 and becomes a high temperature and high pressure gas refrigerant and is discharged.
  • the high-temperature and high-pressure gas refrigerant discharged from the compressor 10 passes through the third flow path 13c of the first flow path switching device 13 and flows out from the outdoor unit 1.
  • the high-temperature and high-pressure gas refrigerant flowing out of the outdoor unit 1 flows into the relay device 3 through the outflow pipe 5b.
  • the high-temperature and high-pressure gas refrigerant that has flowed into the relay device 3 flows into the load-side heat exchanger 26b that acts as a condenser after passing through the gas-liquid separator 29, the first switchgear 23b, and the branch pipe 8b.
  • the refrigerant flowing into the load side heat exchanger 26b dissipates heat to the indoor air to become a liquid refrigerant while heating the indoor air.
  • the liquid refrigerant flowing out from the load-side heat exchanger 26b is expanded by the load-side throttle device 25b and passes through the branch pipe 8b and the second backflow prevention device 22b.
  • the liquid refrigerant passes through the first backflow prevention device 21a and the branch pipe 8b, and then is expanded by the load side throttle device 25a to become a low-temperature low-pressure gas-liquid two-phase state refrigerant.
  • the remaining part of the liquid refrigerant is expanded by the second relay throttle device 27, which is also used as a bypass, and becomes a medium-temperature, medium-pressure liquid or gas-liquid two-phase state refrigerant.
  • the liquid or gas-liquid two-phase state refrigerant flows into the low-pressure pipe on the outlet side of the relay device 3.
  • the gas-liquid two-phase state refrigerant expanded by the load-side throttle device 25a flows into the load-side heat exchanger 26a that acts as an evaporator, and absorbs heat from the room air to cool the room air at low temperature. It becomes a pressure gas-liquid two-phase state refrigerant.
  • the gas-liquid two-phase state refrigerant flowing out of the load-side heat exchanger 26a flows out from the relay device 3 via the branch pipe 8a and the second switchgear 24a.
  • the refrigerant flowing out of the relay device 3 flows into the outdoor unit 1 again through the inflow pipe 5a.
  • the refrigerant flowing into the outdoor unit 1 passes through the third flow path 14c of the second flow path switching device 14 and becomes a low-temperature low-pressure gas refrigerant while absorbing heat from the outdoor air by the heat source side heat exchanger 12.
  • This gas refrigerant compresses the heat source side heat exchanger 12, the fourth flow path 13d of the first flow path switching device 13, the fourth flow path 14d of the second flow path switching device 14, and the accumulator 19 in this order. It is sucked into the machine 10 again.
  • the opening degree of the load side throttle device 25b is a subcool (supercooling degree) obtained as the difference between the value obtained by converting the pressure detected by the pressure sensor 33 into the saturation degree and the temperature detected by the temperature sensor 31b. It is controlled to be constant.
  • the opening degree of the load side throttle device 25a is controlled so that the superheat (superheat degree) obtained as the difference between the temperature detected by the temperature sensor 31a and the temperature detected by the temperature sensor 32a becomes constant. ..
  • the opening degree of the second relay throttle device 27 is such that the pressure difference between the pressure detected by the pressure sensor 33 and the pressure detected by the pressure sensor 34 becomes a predetermined pressure difference (for example, 0.3 MPa). Be controlled.
  • the load side throttle device 25c and the load side throttle device 25d corresponding to each are closed. There is.
  • the load side throttle device 25c or the load side throttle device 25d is opened and the refrigerant circulates.
  • FIG. 5 is a diagram for explaining the configuration of the first flow path switching device 13 according to the first embodiment and the operation in the total cooling operation mode and the cooling main operation mode.
  • the first flow path switching device 13 includes a first flow path 13a, a second flow path 13b, a third flow path 13c, and a fourth flow path 13d provided so as to be openable and closable.
  • the first flow path switching device 13 is a pilot type 4-direction flow path switching valve that switches the flow path by a differential pressure.
  • the first flow path switching device 13 is connected to the high pressure connecting pipe 131a and the low pressure connecting pipe 132a.
  • a high-pressure refrigerant flows into the high-pressure connection pipe 131a.
  • a low-pressure refrigerant flows into the low-pressure connecting pipe 132a.
  • a high-pressure refrigerant flows into the high-pressure connecting pipe 131a between the discharge side of the compressor 10 and the first flow path switching device 13.
  • a low-pressure refrigerant flows into the low-pressure connecting pipe 132a between the second flow path switching device 14 and the suction side of the compressor 10.
  • the first flow path switching device 13 connects the main valve 701a, the pilot valve 702a, and the first communication pipe 147a and the second communication pipe 157a that communicate the main valve 701a and the pilot valve 702a. Be prepared.
  • the main valve 701a includes a first container 133a, a piston 703a arranged in the first container 133a, and switching pipes 141a, 142a, 143a, 144a communicating with the first container 133a.
  • the piston 703a includes a first partition portion 136a, a second partition portion 137a, a connecting portion 138a, and a first valve body portion 139a.
  • the connecting portion 138a connects the first partition portion 136a and the second partition portion 137a.
  • the first valve body portion 139a is provided at the connecting portion 138a.
  • first pressure chamber 134a and a second pressure chamber 135a formed in the first container 133a.
  • the space between one end of the first container 133a and the first partition portion 136a is the first pressure chamber 134a.
  • the space between the other end of the first container 133a and the second partition portion 137a is the second pressure chamber 135a.
  • the connecting portion 138a connects the first partition portion 136a and the second partition portion 137a.
  • the first valve body portion 139a is provided in the middle of the connecting portion 138a.
  • the piston 703a slides according to the difference between the pressure in the first pressure chamber 134a and the pressure in the second pressure chamber 135a.
  • the volumes of the first pressure chamber 134a and the second pressure chamber 135a change.
  • the connecting portion 138a slides to the right, the volume of the first pressure chamber 134a increases and the volume of the second pressure chamber 135a decreases.
  • the piston 703a slides to the left, the volume of the first pressure chamber 134a decreases and the volume of the second pressure chamber 135a increases.
  • the sum of the volume of the first pressure chamber 134a and the volume of the second pressure chamber 135a is kept constant.
  • the first flow path 13a and the four switching pipes 141a, 142a, 143a and the four switching pipes 141a, 142a, 143a constituting the second flow path 13b are formed.
  • 144a is communicated.
  • the switching pipe 141a is connected to the discharge side of the compressor 10.
  • the switching pipe 142a is connected to the second flow path switching device 14.
  • the switching pipe 143a is connected to the relay device 3 via the outflow pipe 5b.
  • the switching tube 144a is connected to the heat source side heat exchanger 12.
  • the three switching pipes 142a, 143a and 144a are provided in parallel within the slide range of the first valve body portion 139a.
  • the switching tube 142a is arranged between the switching tube 143a and the switching tube 144a.
  • the first valve body portion 139a always communicates the switching pipe 142a to the inside, and has two, depending on the pressure of the refrigerant flowing into the first pressure chamber 134a and the second pressure chamber 135a. Either the switching tube 143a or the switching tube 144a can be freely switched to the inside.
  • the switching tube 141a and one of the switching tube 144a or the switching tube 143a are connected via the space 140a. Therefore, a high-pressure refrigerant flows in the space 140a between both the first partition portion 136a and the second partition portion 137a in the first container 133a. As the high-pressure refrigerant flows in the space 140a between both the first partition portion 136a and the second partition portion 137a, the first valve body portion 139a is pressed against the inner wall of the first container 133a, and the low-pressure refrigerant is pressed. The inflow of high-pressure refrigerant into the first valve body portion 139a circulating in the water is prevented.
  • the first flow path switching device 13 has a pilot valve 702a that switches between the high pressure connecting pipe 131a and the low pressure connecting pipe 132a and the high pressure or low pressure refrigerant flowing to the first flow path switching device 13.
  • the pilot valve 702a has a second container 146a in which the high-pressure connecting pipe 131a and the low-pressure connecting pipe 132a are communicated with each other.
  • the pilot valve 702a includes a second valve body portion 148a and a drive portion 149a.
  • the second valve body portion 148a is arranged in the second container 146a.
  • the second valve body portion 148a is the connection portion of the first communication pipe 147a or the second pressure chamber 135a that communicates with the first pressure chamber 134a while always communicating the connection portion of the low pressure connection pipe 132a to the inside within the slide range. Any one of the connecting portions of the second communication pipe 157a that communicates with the communication can be freely switched to the inside.
  • the drive unit 149a slides the second valve body unit 148a.
  • the drive unit 149a is composed of an electromagnet 150a, a plunger 151a attracted by the energized electromagnet 150a, and a spring 152a that repels the attraction direction of the plunger 151a.
  • a support column 153a is provided between the second valve body portion 148a and the plunger 151a.
  • the electromagnet 150a attracts the plunger 151a to the electromagnet 150a side together with the second valve body portion 148a by the supplied electric power.
  • the spring 152a is arranged around the electromagnet 150a, and the plunger 151a is elastically repulsively arranged so as to keep the second valve body portion 148a away from the electromagnet 150a.
  • the pilot valve 702a is connected to a first communication pipe 147a communicating with the first pressure chamber 134a and a second communication pipe 157a communicating with the second pressure chamber 135a.
  • the second valve body portion 148a When the high-pressure refrigerant flows inside the second container 146a of the pilot valve 702a and outside the second valve body portion 148a, the second valve body portion 148a is pressed against the inner wall of the second container 146a, and the low-pressure refrigerant flows. The inflow of high-pressure refrigerant into the second valve body portion 148a is prevented.
  • the high-pressure refrigerant in the high-pressure connecting pipe 131a flows into the first pressure chamber 134a through the first communication pipe 147a.
  • the main valve 701a slides the first valve body portion 139a so as to allow the refrigerant in the second pressure chamber 135a to flow through the second communication pipe 157a and the low pressure connecting pipe 132a and narrow the second pressure chamber 135a.
  • the switching pipe 142a on the inlet side of the second flow path 13b and the switching pipe 143a on the outlet side of the second flow path 13b communicate with each other to form the second flow path 13b.
  • the switching pipe 141a on the inlet side of the first flow path 13a and the outlet side of the first flow path 13a is formed by communicating with the switching pipe 144a.
  • FIG. 6 is a diagram for explaining the configuration of the first flow path switching device 13 according to the first embodiment and the operation in the total heating operation mode and the heating main operation mode.
  • the second valve body portion 148a When the high-pressure refrigerant flows inside the second container 146a of the pilot valve 702a and outside the second valve body portion 148a, the second valve body portion 148a is pressed against the inner wall of the second container 146a, and the low-pressure refrigerant flows. The inflow of high-pressure refrigerant into the second valve body portion 148a is prevented.
  • the high-pressure refrigerant in the high-pressure connecting pipe 131a flows into the second pressure chamber 135a through the second communication pipe 157a.
  • the main valve 701a slides the first valve body portion 139a so as to allow the refrigerant in the first pressure chamber 134a to flow through the first communication pipe 147a and the low pressure connecting pipe 132a and narrow the first pressure chamber 134a.
  • the switching pipe 144a on the inlet side of the fourth flow path 13d and the switching pipe 142a on the outlet side of the fourth flow path 13d communicate with each other to form the fourth flow path 13d.
  • the switching pipe 141a on the inlet side of the third flow path 13c and the outlet side of the third flow path 13c It communicates with the switching tube 143a to form a third flow path 13c.
  • FIG. 7 is a diagram for explaining the configuration of the second flow path switching device 14 according to the first embodiment and the operation in the total cooling operation mode and the cooling main operation mode.
  • the second flow path switching device 14 includes a first flow path 14a, a second flow path 14b, a third flow path 14c, and a fourth flow path 14d provided so as to be openable and closable.
  • the second flow path switching device 14 is a pilot type four-way flow path switching valve that switches the flow path by a differential pressure.
  • the second flow path switching device 14 is connected to the high pressure connecting pipe 131b and the low pressure connecting pipe 132b.
  • a high-pressure refrigerant flows into the high-pressure connection pipe 131b.
  • a low-pressure refrigerant flows into the low-pressure connecting pipe 132b.
  • a high-pressure refrigerant flows into the high-pressure connecting pipe 131b between the discharge side of the compressor 10 and the first flow path switching device 13.
  • a low-pressure refrigerant flows into the low-pressure connecting pipe 132b between the second flow path switching device 14 and the suction side of the compressor 10.
  • the second flow path switching device 14 connects the main valve 701b, the pilot valve 702b, and the first communication pipe 147b and the second communication pipe 157b that communicate the main valve 701b and the pilot valve 702b. Be prepared.
  • the main valve 701b includes a first container 133b, a piston 703b arranged in the first container 133b, and switching pipes 141b, 142b, 143b, 144b communicating with the first container 133b.
  • the piston 703b includes a first partition portion 136b, a second partition portion 137b, a connecting portion 138b, and a first valve body portion 139b.
  • the connecting portion 138b connects the first partition portion 136b and the second partition portion 137b.
  • the first valve body portion 139b is provided on the connecting portion 138b.
  • the second flow path switching device 14 has a first pressure chamber 134b and a second pressure chamber 135b formed in the first container 133b.
  • the space between one end of the first container 133b and the first partition portion 136b is the first pressure chamber.
  • the space between the other end of the first container 133b and the second partition portion 137b is the second pressure chamber.
  • the connecting portion 138b connects the first partition portion 136b and the second partition portion 137b.
  • the first valve body portion 139b is provided in the middle of the connecting portion 138b.
  • the piston 703b slides according to the difference between the pressure in the first pressure chamber 134b and the pressure in the second pressure chamber 135a.
  • the connecting portion 138b By sliding the connecting portion 138b left and right, the volumes of the first pressure chamber 134b and the second pressure chamber 135b change.
  • the connecting portion 138b slides to the right, the volume of the first pressure chamber 134b increases and the volume of the second pressure chamber 135b decreases.
  • the connecting portion 138b slides to the left, the volume of the first pressure chamber 134b decreases and the volume of the second pressure chamber 135b increases.
  • the sum of the volume of the first pressure chamber 134b and the volume of the second pressure chamber 135b is kept constant.
  • the first flow path 14a and the four switching pipes 141b, 142b, 143b and the four switching pipes 141b, 142b, 143b constituting the second flow path 14b are formed.
  • 144b is communicated.
  • the switching tube 141b is connected to the heat source side heat exchanger 12.
  • the switching tube 142b is connected to the suction side of the compressor 10.
  • the switching pipe 143b is connected to the relay device 3 via the inflow pipe 5a.
  • the switching pipe 144b is connected to the first flow path switching device 13.
  • the three switching pipes 142b, 143b and 144b are provided in parallel within the slide range of the first valve body portion 139b.
  • the switching tube 142b is arranged between the switching tube 143b and the switching tube 144b.
  • the first valve body portion 139b always communicates the switching pipe 142b to the inside, and has two, depending on the pressure of the refrigerant flowing into the first pressure chamber 134b and the second pressure chamber 135b. Either the switching tube 143b or the switching tube 144b can be freely switched to the inside.
  • the switching tube 141b and one of the switching tube 144b or the switching tube 143b are connected via the space 140b. Therefore, a high-pressure refrigerant flows in the space 140b between both the first partition portion 136b and the second partition portion 137b in the first container 133b.
  • the high-pressure refrigerant flows in the space 140b between both the first partition portion 136b and the second partition portion 137b, so that the first valve body portion 139b is pressed against the inner wall of the first container 133b, and the low-pressure refrigerant is pressed.
  • the inflow of high-pressure refrigerant into the first valve body portion 139b circulating in the water is prevented.
  • the second flow path switching device 14 has a pilot valve 702b that switches between the high pressure connecting pipe 131b and the low pressure connecting pipe 132b and the high pressure or low pressure refrigerant flowing to the second flow path switching device 14.
  • the pilot valve 702b has a second container 146b to which the high pressure connecting pipe 131b and the low pressure connecting pipe 132b are connected.
  • the pilot valve 702b includes a second valve body portion 148b and a drive portion 149b.
  • the second valve body portion 148b is arranged in the second container 146b.
  • the second valve body portion 148b is the connection portion of the first communication pipe 147b or the second pressure chamber 135b that communicates with the first pressure chamber 134b while always communicating the connection portion of the low pressure connection pipe 132b to the inside within the slide range. Any one of the connecting portions of the second communication pipe 157b that communicates with the communication can be freely switched to the inside.
  • the drive unit 149b slides the second valve body unit 148b.
  • the drive unit 149b is composed of an electromagnet 150b, a plunger 151b attracted by the energized electromagnet 150b, and a spring 152b that repels the attraction direction of the plunger 151b.
  • a support column 153b is provided between the second valve body portion 148b and the plunger 151b.
  • the electromagnet 150b attracts the plunger 151b to the electromagnet 150b side together with the second valve body portion 148b by the supplied electric power.
  • the spring 152b is arranged around the electromagnet 150b, and the plunger 151b is elastically repulsively arranged so as to keep the second valve body portion 148b away from the electromagnet 150b.
  • the pilot valve 702b is connected to a first communication pipe 147b communicating with the first pressure chamber 134b and a second communication pipe 157b communicating with the second pressure chamber 135b.
  • the second valve body portion 148b When the high-pressure refrigerant flows inside the second container 146b of the pilot valve 702b and outside the second valve body portion 148b, the second valve body portion 148b is pressed against the inner wall of the second container 146b, and the low-pressure refrigerant flows. The inflow of high-pressure refrigerant into the second valve body portion 148b is prevented.
  • the high-pressure refrigerant in the high-pressure connecting pipe 131b flows into the first pressure chamber 134b through the first communication pipe 147b.
  • the main valve 701b slides the first valve body portion 139b so as to allow the refrigerant in the second pressure chamber 135b to flow through the second communication pipe 157b and the low pressure connecting pipe 132b and narrow the second pressure chamber 135b.
  • the switching pipe 143b on the inlet side of the second flow path 14b and the switching pipe 142b on the outlet side of the second flow path 14b communicate with each other to form the second flow path 14b.
  • the switching pipe 141b on the inlet side of the first flow path 14a and the outlet side of the first flow path 14a is formed by communicating with the switching pipe 144b.
  • FIG. 8 is a diagram for explaining the configuration of the second flow path switching device 14 according to the first embodiment and the operation in the total heating operation mode and the heating main operation mode.
  • the second valve body portion 148b When the high-pressure refrigerant flows inside the second container 146b of the pilot valve 702b and outside the second valve body portion 148b, the second valve body portion 148b is pressed against the inner wall of the second container 146b, and the low-pressure refrigerant flows. The inflow of high-pressure refrigerant into the second valve body portion 148b is prevented.
  • the high-pressure refrigerant in the high-pressure connecting pipe 131b flows into the second pressure chamber 135b through the second communication pipe 157b.
  • the main valve 701b slides the first valve body portion 139b so as to allow the refrigerant in the first pressure chamber 134b to flow through the first communication pipe 147b and the low pressure connecting pipe 132b and narrow the first pressure chamber 134b.
  • the switching pipe 144b on the inlet side of the fourth flow path 14d and the switching pipe 142b on the outlet side of the fourth flow path 13d communicate with each other to form the fourth flow path 14d.
  • the switching pipe 143b on the inlet side of the third flow path 14c and the outlet side of the third flow path 14c It communicates with the switching tube 141b to form a third flow path 14c.
  • only one of the first flow path switching device 13 and the second flow path switching device 14 may be a pilot type four-way flow path switching valve.
  • 9A and 9B are diagrams for explaining a detailed configuration of the first partition portion 136a of the first flow path switching device 13 and its operation.
  • the first partition portion 136a has a bias structure for bypassing the refrigerant from the first pressure chamber 134a to the space 140a when the pressure in the first pressure chamber 134a is higher than the pressure in the space 140a.
  • the first partition portion 136a includes a first partition plate 171a and a soft first seal 155a fixed to the first partition plate 171a.
  • the first seal 155a is made of, for example, Teflon (registered trademark) or the like.
  • the first seal 155a when the pressure of the first pressure chamber 134a is lower than the pressure of the space 140a, the first seal 155a does not collapse, and the first seal 155a is the inner surface of the first container 133a and the first seal. Maintain a position where it comes into contact with 155a. This does not bypass the refrigerant.
  • 10A and 10B are diagrams for explaining the detailed configuration of the second partition portion 137a of the first flow path switching device 13 and its operation.
  • the second partition portion 137a has a bias structure for bypassing the refrigerant from the second pressure chamber 135a to the space 140a when the pressure in the second pressure chamber 135a is higher than the pressure in the space 140a.
  • the second partition portion 137a includes a second partition plate 172a and a soft second seal 154a fixed to the second partition plate 172a.
  • the second seal 154a is made of, for example, Teflon or the like.
  • the second seal 154a when the pressure of the second pressure chamber 135a is lower than the pressure of the space 140a, the second seal 154a does not collapse, and the second seal 154a is the inner surface of the first container 133a and the second seal. Maintain a position where it comes into contact with 154a. This does not bypass the refrigerant.
  • 11A and 11B are diagrams for explaining the detailed configuration of the first partition portion 136b of the second flow path switching device 14 and its operation.
  • the first partition portion 136b has a bias structure for bypassing the refrigerant from the first pressure chamber 134b to the space 140b when the pressure in the first pressure chamber 134b is higher than the pressure in the space 140b.
  • the first partition portion 136b includes a first partition plate 171b and a soft first seal 155b fixed to the first partition plate 171b.
  • the first seal 155b is made of, for example, Teflon or the like.
  • the first seal 155b when the pressure of the first pressure chamber 134b is lower than the pressure of the space 140b, the first seal 155b does not collapse, and the first seal 155b is the inner surface of the first container 133b and the first seal. Maintain a position where it comes into contact with 155b. This does not bypass the refrigerant.
  • 12A and 12B are diagrams for explaining the detailed configuration of the second partition portion 137b of the second flow path switching device 14 and its operation.
  • the second partition portion 137b has a bias structure for bypassing the refrigerant from the second pressure chamber 135b to the space 140b when the pressure in the second pressure chamber 135b is higher than the pressure in the space 140b.
  • the second partition portion 137b includes a second partition plate 172b and a soft second seal 154b fixed to the second partition plate 172b.
  • the second seal 154b is made of, for example, Teflon or the like.
  • the second seal 154b when the pressure of the second pressure chamber 135b is lower than the pressure of the space 140b, the second seal 154b does not collapse, and the second seal 154b is the inner surface of the first container 133b and the second seal. Maintain a position where it comes into contact with 154b. This does not bypass the refrigerant.
  • FIG. 13 is a diagram for explaining the flow of the refrigerant of the first flow path switching device 13 and the second flow path switching device 14 in the total cooling operation mode and the cooling main operation mode.
  • FIG. 14 is a diagram for explaining the operation of the first flow path switching device 13 in the total cooling operation mode and the cooling main operation mode.
  • FIG. 15 is a diagram for explaining the operation of the second flow path switching device 14 in the total cooling operation mode and the cooling main operation mode.
  • the space 140a of the first flow path switching device 13 communicates with the discharge side of the compressor 10. Therefore, the pressure in the space 140a is the same as the discharge pressure of the compressor 10.
  • the first pressure chamber 134a of the first flow path switching device 13 communicates with the high pressure portion (discharge side of the compressor 10) via the high pressure connecting pipe 131a. Therefore, the pressure in the first pressure chamber 134a is the same as the pressure in the high pressure portion (discharge side of the compressor 10). Therefore, the pressure in the space 140a of the first flow path switching device 13 and the pressure in the first pressure chamber 134a of the first flow path switching device 13 are the same. As a result, the first seal 155a of the first partition portion 136a of the first flow path switching device 13 does not collapse, and the refrigerant does not bypass from the first pressure chamber 134a to the space 140a.
  • the second pressure chamber 135a of the first flow path switching device 13 communicates with the low pressure portion (the suction side of the compressor 10) via the low pressure connecting pipe 132a. Therefore, the pressure in the space 140a of the first flow path switching device 13 is higher than the pressure in the second pressure chamber 135a of the first flow path switching device 13. As a result, the second seal 154a of the second partition portion 137a of the first flow path switching device 13 does not collapse, and the refrigerant does not bypass from the second pressure chamber 135a to the space 140a.
  • the space 140b of the second flow path switching device 14 communicates with the outlet of the heat source side heat exchanger 12 that functions as a condenser. Therefore, the pressure in the space 140b is the same as the pressure at the outlet of the heat source side heat exchanger 12 that functions as a condenser.
  • the pressure at the outlet of the heat source side heat exchanger 12 is the pressure obtained by subtracting the pressure loss due to the heat source side heat exchanger 12 from the discharge pressure of the compressor 10.
  • the first pressure chamber 134b of the second flow path switching device 14 communicates with the high pressure portion (discharge side of the compressor 10) via the high pressure connecting pipe 131b.
  • the pressure in the first pressure chamber 134b is the same as the pressure (high pressure) in the high pressure portion (discharge side of the compressor 10). Therefore, the pressure in the first pressure chamber 134b of the second flow path switching device 14 is higher than the pressure in the space 140b of the second flow path switching device 14. As a result, the first seal 155b of the first partition portion 136b of the second flow path switching device 14 collapses, and the refrigerant bypasses from the first pressure chamber 134b to the space 140b. However, since the differential pressure between the pressure in the first pressure chamber 134b and the pressure in the space 140b is small, the bypass flow path is small.
  • FIG. 16 is a diagram for explaining the flow of the refrigerant of the first flow path switching device 13 and the second flow path switching device 14 in the full heating operation mode and the heating main operation mode.
  • FIG. 17 is a diagram for explaining the operation of the first flow path switching device 13 in the full heating operation mode and the heating main operation mode.
  • FIG. 18 is a diagram for explaining the operation of the second flow path switching device 14 in the full heating operation mode and the heating main operation mode.
  • the space 140a of the first flow path switching device 13 communicates with the discharge side of the compressor 10. Therefore, the pressure in the space 140a is the same as the discharge pressure of the compressor 10.
  • the second pressure chamber 135a of the first flow path switching device 13 communicates with the high pressure portion (discharge side of the compressor 10) via the high pressure connecting pipe 131a. Therefore, the pressure in the second pressure chamber 135a is the same as the pressure in the high pressure portion (discharge side of the compressor 10). Therefore, the pressure in the space 140a of the first flow path switching device 13 and the pressure in the second pressure chamber 135a of the first flow path switching device 13 are the same.
  • the second seal 154a of the second partition portion 137a of the first flow path switching device 13 does not collapse, and the refrigerant does not bypass from the second pressure chamber 135a to the space 140a.
  • the first pressure chamber 134a of the first flow path switching device 13 communicates with the low pressure portion (the suction side of the compressor 10) via the low pressure connecting pipe 132a. Therefore, the pressure in the space 140a of the first flow path switching device 13 is higher than the pressure in the first pressure chamber 134a of the first flow path switching device 13. As a result, the first seal 155a of the first partition portion 136a of the first flow path switching device 13 does not collapse, and the refrigerant does not bypass from the first pressure chamber 134a to the space 140a.
  • the space 140b of the second flow path switching device 14 communicates with the outlet of the heat source side heat exchanger 12 that functions as an evaporator. Therefore, the pressure in the space 140b is the same as the pressure (low pressure) at the outlet of the heat source side heat exchanger 12 that functions as an evaporator.
  • the first pressure chamber 134b of the second flow path switching device 14 communicates with the low pressure portion (the suction side of the compressor 10) via the low pressure connecting pipe 132b. Therefore, the pressure in the space 140b of the second flow path switching device 14 is the same as the pressure in the first pressure chamber 134a of the first flow path switching device 13. As a result, the first seal 155b of the first partition portion 136b of the second flow path switching device 14 does not collapse, and the refrigerant does not bypass from the first pressure chamber 134b to the space 140b.
  • the second pressure chamber 135b of the second flow path switching device 14 communicates with the high pressure portion (discharge side of the compressor 10) via the high pressure connecting pipe 131b. Therefore, the pressure in the second pressure chamber 135b of the second flow path switching device 14 is higher than the pressure in the space 140b of the second flow path switching device 14. As a result, the second seal 154b of the second partition portion 137b of the second flow path switching device 14 collapses, and the refrigerant bypasses from the second pressure chamber 135b to the space 140b.
  • FIG. 19 is a PH diagram in the total cooling operation mode and the cooling main operation mode.
  • the cooling capacity CC is represented below by using the enthalpy h1 at the inlet of the condenser, the enthalpy h2 at the outlet of the condenser, and the refrigerant circulation amount CV.
  • the cooling energy consumption efficiency C_COP is represented by the following using the cooling capacity CC and the cooling power consumption CP.
  • FIG. 20 is a PH diagram in the full heating operation mode and the heating main operation mode.
  • the heating capacity WC is represented below by using the enthalpy h3 at the inlet of the evaporator, the enthalpy h4 at the outlet of the evaporator, and the refrigerant circulation amount WV.
  • the heating energy consumption efficiency W_COP is represented by the following using the heating capacity WC and the heating power consumption WP.
  • FIG. 21 is a diagram for explaining a state of the first flow path switching device 13 when the air conditioner 100 is switched from the total cooling mode or the cooling main mode to the full heating mode or the heating main mode.
  • the first pressure chamber 134a of the first flow path switching device 13 communicates with the low pressure portion (the suction side of the compressor 10) via the first communication pipe 147a and the low pressure connection pipe 132a, so that the pressure is low. Become.
  • the pressure in the space 140a of the first flow path switching device 13 becomes higher than the pressure in the first pressure chamber 134a of the first flow path switching device 13.
  • the first seal 155a of the first partition portion 136a does not collapse and the refrigerant does not bypass.
  • the second pressure chamber 135a of the first flow path switching device 13 communicates with the high pressure portion (the suction side of the compressor 10) via the second communication pipe 157a and the high pressure connection pipe 131a, so that the pressure is high. Become.
  • the pressure in the space 140a of the first flow path switching device 13 becomes the same as the pressure in the second pressure chamber 135a of the first flow path switching device 13.
  • the second seal 154a of the second partition portion 137a does not collapse and the refrigerant does not bypass.
  • the refrigerant does not bypass in the first flow path switching device 13, so that the first pressure chamber 134a
  • the difference between the pressure of the second pressure chamber 135a and the pressure of the second pressure chamber 135a is unlikely to be small.
  • the flow path switching operation of the first flow path switching device 13 becomes easy (smoothly performed).
  • FIG. 22 is a diagram for explaining a state of the second flow path switching device 14 when the air conditioner 100 is switched from the total cooling mode or the cooling main mode to the full heating mode or the heating main mode.
  • the first pressure chamber 134b of the second flow path switching device 14 communicates with the high pressure portion (discharge side of the compressor 10) via the first communication pipe 147b and the high pressure connection pipe 131b, so that the pressure is high. It becomes.
  • the pressure chamber 134b of the second flow path switching device 14 becomes higher than the pressure of the space 140b of the second flow path switching device 14.
  • the first seal 155b of the first partition portion 136b collapses, and the refrigerant bypasses.
  • the refrigerant bypassed to the space 140b also flows to the suction side of the compressor 10 through the switching pipe 142b.
  • the second pressure chamber 135b of the second flow path switching device 14 communicates with the low pressure portion (the suction side of the compressor 10) via the second communication pipe 157b and the low pressure connection pipe 132b, so that the pressure is low. It becomes.
  • the refrigerant is transferred from the first pressure chamber 134b to the space 140b in the second flow path switching device 14. Since the piping is performed, the pressure difference between the first pressure chamber 134b and the second pressure chamber 135b tends to be small, the force for moving the first valve body portion 139b is reduced, and the switching operation becomes difficult.
  • FIG. 23 is a diagram for explaining a state of the first flow path switching device 13 when the air conditioner 100 is switched from the total heating mode or the heating main mode to the total cooling mode or the cooling main mode.
  • the pressure chamber 134a has a high pressure.
  • the second pressure chamber 135a of the first flow path switching device 13 communicates with the low pressure portion (the suction side of the compressor 10) via the second communication pipe 157a and the low pressure connection pipe 132a. 2
  • the pressure chamber 135a has a low pressure.
  • the pressure in the space 140a of the first flow path switching device 13 becomes higher than the pressure in the second pressure chamber 135a of the first flow path switching device 13.
  • the second seal 154a of the second partition portion 137a does not collapse and the refrigerant does not bypass.
  • the refrigerant does not bypass in the first flow path switching device 13, so that the first pressure chamber 134a
  • the difference between the pressure of the second pressure chamber 135a and the pressure of the second pressure chamber 135a is unlikely to be small.
  • the flow path switching operation of the first flow path switching device 13 becomes easy (smoothly performed).
  • FIG. 24 is a diagram for explaining a state of the second flow path switching device 14 when the air conditioner 100 is switched from the total heating mode or the heating main mode to the total cooling mode or the cooling main mode.
  • the pressure in the space 140b of the second flow path switching device 14 becomes higher than the pressure in the first pressure chamber 134b of the second flow path switching device 14.
  • the first seal 155b of the first partition portion 136b did not fall down. Refrigerant does not bypass.
  • the second pressure chamber 135b of the second flow path switching device 14 communicates with the high pressure portion (discharge side of the compressor 10) via the second communication pipe 157b and the high pressure connection pipe 131b, so that the pressure is high. Become.
  • the refrigerant is transferred from the second pressure chamber 135b to the space 140b in the second flow path switching device 14. Since the piping is performed, the pressure difference between the first pressure chamber 134b and the second pressure chamber 135b tends to be small, the force for moving the first valve body portion 139b is reduced, and the switching operation becomes difficult.
  • the second flow path switching device 14 bypasses the refrigerant because the refrigerant passes from the first pressure chamber 134b to the space 140b.
  • the pressure in the first pressure chamber 134b By supplying the same amount or more of the refrigerant to the first pressure chamber 134b, it is possible to prevent the pressure in the first pressure chamber 134b from dropping. As a result, the pressure difference between the first pressure chamber 134b and the second pressure chamber 135b can be maintained, and the adverse effect on the switching operation can be reduced.
  • the refrigerant passes from the second pressure chamber 135b to the space 140b in the second flow path switching device 14, so that the bypass amount
  • the pressure in the second pressure chamber 135b can be prevented from decreasing.
  • the pressure difference between the first pressure chamber 134b and the second pressure chamber 135b can be maintained, and the adverse effect on the switching operation can be reduced.
  • the outdoor unit 1 of the present embodiment includes a flow path resistance variable mechanism that changes the flow path resistance of the high-voltage connection pipe 131.
  • the control device 60 reduces the flow path resistance of the flow path resistance variable mechanism at the time of the first switching from the cooling operation to the heating operation and at the time of the second switching from the heating operation to the cooling operation.
  • the control device 60 increases the flow path resistance of the flow path resistance variable mechanism at times other than the first switching and the second switching.
  • FIG. 25 is a diagram showing the flow path resistance variable structure of the first embodiment.
  • the outdoor unit 1 includes a solenoid valve 51 provided in the high-voltage connection pipe 131b connected to the second flow path switching device 14 as a flow path resistance variable mechanism.
  • the opening degree of the solenoid valve 51 can be adjusted in two stages. When the opening degree of the solenoid valve 51 is large, the flow path resistance of the high-pressure connecting pipe 131b becomes small. When the opening degree of the solenoid valve 51 is small, the flow path resistance of the high-pressure connecting pipe 131b becomes large.
  • FIG. 26 is a flowchart showing the control procedure of the solenoid valve 51 of the first embodiment.
  • step S101 when the control device 60 receives the flow path switching signal at the time of the first switching from the cooling operation to the heating operation of the air conditioning device 100 and at the time of the second switching from the heating operation to the cooling operation of the air conditioning device 100, The process proceeds to step S102.
  • step S102 the control device 60 reduces the flow path resistance of the high-pressure connection pipe 131b of the second flow path switching device 14 by increasing the opening degree of the solenoid valve 51.
  • step S103 the control device 60 starts the flow path switching operation of the first flow path switching device 13 and the second flow path switching device 14. After the flow path switching operations of the first flow path switching device 13 and the second flow path switching device 14 are completed, the process proceeds to step S104.
  • step S104 the control device 60 increases the flow path resistance of the high-pressure connection pipe 131b of the second flow path switching device 14 by reducing the opening degree of the solenoid valve 51.
  • the flow paths of the two four-way valves can be smoothly switched and the operation can be performed with high efficiency.
  • FIG. 27 is a diagram showing the configuration of the air conditioner 100 according to the second embodiment and the flow of the refrigerant in the total cooling operation mode.
  • the high-pressure connection pipe 131c is connected to the discharge side of the compressor 10 and the second flow path switching device 14.
  • the high-pressure connection pipe 131d is connected to the discharge side of the compressor 10 and the second flow path switching device 14. High-pressure refrigerant flows into the high-pressure connection pipes 131c and 131d between the discharge side of the compressor 10 and the first flow path switching device 13.
  • FIG. 28 is a diagram showing the flow path resistance variable structure of the second embodiment.
  • the first communication pipe 147b and the high-voltage connection pipe 131c are communicated with each other by the node NO1.
  • the second communication pipe 157b and the high-voltage connection pipe 131d are communicated with each other by the node NO2.
  • a solenoid valve 61 is provided on the high-voltage connection pipe 131c.
  • a solenoid valve 62 is provided on the high-voltage connection pipe 131d.
  • the flow path resistance of the high-pressure connection pipe 131c when the solenoid valve 61 is opened is smaller than the flow path resistance of the first communication pipe 147b between the connection portion with the pilot valve 702b and the node NO1.
  • the flow path resistance of the high-pressure connection pipe 131d when the solenoid valve 62 is opened is smaller than the flow path resistance of the second communication pipe 157b between the connection portion with the pilot valve 702b and the node NO2.
  • the control device 60 opens the solenoid valve 61 and closes the solenoid valve 62 at the time of the first switching from the cooling operation to the heating operation.
  • the control device 60 closes the solenoid valve 61 and opens the solenoid valve 62 at the time of the second switching from the heating operation to the cooling operation.
  • the control device 60 closes the solenoid valve 61 and the solenoid valve 62 at times other than the first switching and the second switching.
  • FIG. 29 is a flowchart showing the control procedure of the solenoid valves 61 and 62 of the second embodiment.
  • step S201 when the control device 60 receives the flow path switching signal at the time of the first switching from the cooling operation to the heating operation of the air conditioning device 100 and at the time of the second switching from the heating operation to the cooling operation of the air conditioning device 100, The process proceeds to step S202.
  • step S202 When switching the air conditioner 100 from the cooling operation to the heating operation in step S202, the process proceeds to step S203.
  • step S204 When switching the air conditioner 100 from the heating operation to the cooling operation, the process proceeds to step S204.
  • step S203 the control device 60 opens the solenoid valve 61 on the first pressure chamber 134b side and closes the solenoid valve 62 on the second pressure chamber 135b side. This reduces the flow path resistance of the high pressure refrigerant flowing into the first pressure chamber 134b.
  • step S204 the control device 60 closes the solenoid valve 61 on the first pressure chamber 134b side and opens the solenoid valve 62 on the second pressure chamber 135b side. This reduces the flow path resistance of the high pressure refrigerant flowing into the second pressure chamber 135b.
  • step S205 the control device 60 starts the flow path switching operation of the first flow path switching device 13 and the second flow path switching device 14. After the flow path switching operations of the first flow path switching device 13 and the second flow path switching device 14 are completed, the process proceeds to step S206.
  • step S206 the control device 60 closes the solenoid valve 61 on the first pressure chamber 134b side and the solenoid valve 62 on the second pressure chamber 135b side.
  • the flow paths of the two four-way valves can be smoothly switched and the operation can be performed with high efficiency.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

La présente invention a pour but de fournir une unité extérieure et un dispositif de climatisation permettant de commuter sans entraves les circuits d'écoulement de deux soupapes à quatre voies disposées en série. Une première partie de séparation (136b) comprend une première structure de dérivation (155b) destinée à dériver un fluide frigorigène lorsque la pression dans un premier compartiment à pression (134b) est supérieure à la pression dans un vide (140b). Une seconde partie de séparation (137b) comprend une seconde structure de dérivation (154b) destinée à dériver le fluide frigorigène lorsque la pression dans un second compartiment à pression (135b) est supérieure à la pression dans le vide (140b). Une soupape pilote (702b) est en communication, pendant un fonctionnement de refroidissement, avec un premier tuyau de raccordement à haute pression (131b) ou avec un tuyau de raccordement à basse pression (132b) à un premier tuyau de communication (147b) permettant la communication avec le premier compartiment à pression (134b) ; et en communication, pendant un fonctionnement de chauffage, avec l'autre tuyau parmi le premier tuyau de raccordement à haute pression (131b) et le tuyau de raccordement à basse pression (132b) à un second tuyau de communication (157b) permettant la communication avec le second compartiment à pression (135b). L'unité extérieure est munie d'un mécanisme de résistance de circuit d'écoulement variable (51) destiné à faire varier la résistance des circuits d'écoulement du fluide frigorigène vers le premier compartiment à pression (134b) et vers le second compartiment à pression (135b).
PCT/JP2019/044401 2019-11-12 2019-11-12 Unité extérieure et dispositif de climatisation WO2021095134A1 (fr)

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Cited By (2)

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CN113443729A (zh) * 2021-07-07 2021-09-28 七道水(厦门)健康科技有限公司 一种水过滤结构及流向切换机构
WO2024070872A1 (fr) * 2022-09-27 2024-04-04 三菱重工サーマルシステムズ株式会社 Climatiseur

Families Citing this family (1)

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CN117212277A (zh) * 2023-09-20 2023-12-12 新心医疗器械(北京)有限公司 一种电磁驱动的气动控制装置

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JPS568976U (fr) * 1979-06-30 1981-01-26
JPS6315056A (ja) * 1986-07-07 1988-01-22 ダイキン工業株式会社 冷凍装置用四路切換弁
JPH0238057U (fr) * 1988-09-07 1990-03-13
JPH09196489A (ja) * 1996-01-19 1997-07-31 Fujitsu General Ltd 空気調和機の冷凍サイクル
JPH1163738A (ja) * 1997-08-21 1999-03-05 Daikin Ind Ltd 冷凍装置
JPH11294607A (ja) * 1998-04-10 1999-10-29 Daikin Ind Ltd 四路切換弁
JPH11337232A (ja) * 1998-05-28 1999-12-10 Tokyo Gas Co Ltd 切替弁の制御方法
WO2011052042A1 (fr) * 2009-10-27 2011-05-05 三菱電機株式会社 Dispositif de conditionnement d'air
CN105423658A (zh) * 2015-12-25 2016-03-23 西安交通大学 一种带截止功能的四通换向阀
WO2018037876A1 (fr) * 2016-08-26 2018-03-01 株式会社鷺宮製作所 Soupape à tiroir et système à cycle de réfrigération

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JPS568976U (fr) * 1979-06-30 1981-01-26
JPS6315056A (ja) * 1986-07-07 1988-01-22 ダイキン工業株式会社 冷凍装置用四路切換弁
JPH0238057U (fr) * 1988-09-07 1990-03-13
JPH09196489A (ja) * 1996-01-19 1997-07-31 Fujitsu General Ltd 空気調和機の冷凍サイクル
JPH1163738A (ja) * 1997-08-21 1999-03-05 Daikin Ind Ltd 冷凍装置
JPH11294607A (ja) * 1998-04-10 1999-10-29 Daikin Ind Ltd 四路切換弁
JPH11337232A (ja) * 1998-05-28 1999-12-10 Tokyo Gas Co Ltd 切替弁の制御方法
WO2011052042A1 (fr) * 2009-10-27 2011-05-05 三菱電機株式会社 Dispositif de conditionnement d'air
CN105423658A (zh) * 2015-12-25 2016-03-23 西安交通大学 一种带截止功能的四通换向阀
WO2018037876A1 (fr) * 2016-08-26 2018-03-01 株式会社鷺宮製作所 Soupape à tiroir et système à cycle de réfrigération

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Publication number Priority date Publication date Assignee Title
CN113443729A (zh) * 2021-07-07 2021-09-28 七道水(厦门)健康科技有限公司 一种水过滤结构及流向切换机构
WO2024070872A1 (fr) * 2022-09-27 2024-04-04 三菱重工サーマルシステムズ株式会社 Climatiseur

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