WO2022038708A1 - 空気調和装置 - Google Patents

空気調和装置 Download PDF

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Publication number
WO2022038708A1
WO2022038708A1 PCT/JP2020/031252 JP2020031252W WO2022038708A1 WO 2022038708 A1 WO2022038708 A1 WO 2022038708A1 JP 2020031252 W JP2020031252 W JP 2020031252W WO 2022038708 A1 WO2022038708 A1 WO 2022038708A1
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WIPO (PCT)
Prior art keywords
refrigerant
side shutoff
unit
outdoor
shutoff valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2020/031252
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English (en)
French (fr)
Japanese (ja)
Inventor
結 義澤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
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Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP2022543869A priority Critical patent/JP7415017B2/ja
Priority to PCT/JP2020/031252 priority patent/WO2022038708A1/ja
Publication of WO2022038708A1 publication Critical patent/WO2022038708A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/32—Responding to malfunctions or emergencies
    • F24F11/36—Responding to malfunctions or emergencies to leakage of heat-exchange fluid
    • 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
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems

Definitions

  • This disclosure relates to an air conditioner for air conditioning in a room.
  • Patent Document 1 includes an air-conditioning device provided with a shut-off valve device separate from the indoor unit and shuts off the flow of the refrigerant flowing through the refrigerant circuit by closing the shut-off valve provided in the shut-off valve device when the refrigerant leaks. Is disclosed. In this air conditioning equipment, an expansion valve that requires a power source to open and close the valve is used as the shutoff valve of the shutoff valve device.
  • Patent Document 2 discloses an air conditioner in which a shutoff valve is provided in both the liquid side pipe and the gas side pipe in a system having an expansion valve in the indoor unit.
  • a solenoid valve is used as a shutoff valve.
  • a solenoid valve configured to close when the power is lost is known.
  • a solenoid valve used as a shut-off valve in the air conditioner described in Patent Document 2
  • the refrigerant can be shut off even when the power supply is lost.
  • there is a pressure loss in the shutoff valve using the solenoid valve Therefore, when the refrigerant passes through the shutoff valve, the pressure state of the refrigerant changes as compared with the case where the shutoff valve is not provided.
  • the refrigerant is a liquid refrigerant or a two-phase refrigerant
  • the refrigerant cannot be properly controlled or an abnormality such as an abnormal noise is generated from the expansion valve.
  • the present disclosure has been made in view of the above-mentioned problems in the prior art, and provides an air conditioner capable of appropriately controlling the refrigerant passing through the expansion valve without being affected by the shutoff valve. With the goal.
  • the air conditioner according to the present disclosure includes an outdoor unit having a compressor and an outdoor heat exchanger, an indoor unit having an indoor heat exchanger, an expansion valve, and a refrigerant flowing from the outdoor unit to the indoor unit during cooling operation.
  • the compressor comprises a liquid-side shutoff valve for opening or shutting off the air, and an expansion valve unit having a gas-side shutoff valve for opening or shutting off the refrigerant flowing from the indoor unit to the outdoor unit during the cooling operation.
  • a refrigerant circuit is formed by connecting the outdoor heat exchanger, the expansion valve, the liquid side shutoff valve, the indoor heat exchanger, the gas side shutoff valve and the compressor in an annular shape, and the liquid side shutoff valve is formed. Is provided between the expansion valve and the indoor heat exchanger, and the gas side shutoff valve is provided between the indoor heat exchanger and the compressor.
  • the expansion valve unit is provided with an expansion valve, a liquid side shutoff valve, and a gas side shutoff valve, and the liquid side shutoff valve is provided between the expansion valve and the indoor heat exchanger.
  • the refrigerant flows into the expansion valve in a stable state, so that the refrigerant passing through the expansion valve can be appropriately controlled.
  • FIG. 1 It is a circuit diagram which shows an example of the structure of the air conditioner which concerns on Embodiment 1.
  • FIG. It is a circuit diagram which shows an example of the structure of the air conditioner which concerns on Embodiment 2.
  • FIG. 1 It is a circuit diagram which shows an example of the structure of the air conditioner which concerns on Embodiment 1.
  • Embodiment 1 The air conditioner according to the first embodiment will be described.
  • the air-conditioning device according to the first embodiment performs air-conditioning in the target space by circulating the refrigerant in the refrigerant circuit.
  • FIG. 1 is a circuit diagram showing an example of the configuration of the air conditioner according to the first embodiment.
  • the air conditioner 1 includes an outdoor unit 10, an expansion valve unit 20, and indoor units 30a and 30b.
  • a refrigerant circuit is formed by connecting the outdoor unit 10, the expansion valve unit 20, and the indoor units 30a and 30b with a refrigerant pipe.
  • the refrigerant flowing through the refrigerant circuit for example, in addition to R22, R407C, R410A and the like, flammable refrigerants such as propane, HFO and R32 are used.
  • two indoor units 30a and 30b are provided, but the present invention is not limited to this, and the number of indoor units may be one or more.
  • the outdoor unit 10 includes a compressor 11, an outdoor heat exchanger 12, and an outdoor control device 15.
  • the compressor 11 sucks in the low-temperature low-pressure refrigerant, compresses the sucked refrigerant, and discharges the high-temperature and high-pressure refrigerant.
  • the compressor 11 is composed of, for example, an inverter compressor or the like whose capacity, which is a transmission amount per unit time, is controlled by changing the operating frequency.
  • the operating frequency of the compressor 11 is controlled by the outdoor control device 15.
  • the outdoor heat exchanger 12 exchanges heat between the outdoor air supplied by a blower (not shown) and the refrigerant.
  • the outdoor heat exchanger 12 functions as a condenser that dissipates the heat of the refrigerant to the outdoor air and condenses the refrigerant during the cooling operation.
  • the outdoor control device 15 controls each part provided in the outdoor unit 10 and the indoor units 30a and 30b.
  • the outdoor control device 15 controls the operating frequency of the compressor 11 and the opening degrees of the expansion valves 23a and 23b so that the temperature of the air-conditioned space becomes the set temperature set by the remote controllers 34a and 34b.
  • the indoor unit 30a is installed in the air-conditioned space and has an indoor heat exchanger 31a. Further, a refrigerant leak sensor 32a, an alarm device 33a, and a remote controller (hereinafter, appropriately referred to as "remote controller") 34a are provided in the air-conditioned space.
  • the indoor unit 30b is installed in the air-conditioned space and has an indoor heat exchanger 31b. Further, a refrigerant leakage sensor 32b, an alarm device 33b, and a remote controller 34b are provided in the air-conditioned space.
  • the indoor units 30a and 30b have the same configuration. Further, the refrigerant leakage sensors 32a and 32b, the alarm devices 33a and 33b, and the remote controllers 34a and 34b have the same configurations, respectively. Therefore, in the following, as an example, the indoor unit 30a, the refrigerant leakage sensor 32a, the alarm device 33a, and the remote controller 34a will be described.
  • the indoor heat exchanger 31a exchanges heat between the indoor air supplied by a blower (not shown) and the refrigerant.
  • the indoor heat exchanger 31a functions as an evaporator during the cooling operation, and cools the air in the air-conditioned space for cooling.
  • the refrigerant leakage sensor 32a is installed in the air-conditioned space and detects the leakage of the refrigerant into the air-conditioned space. The detection result is supplied to the repeater control device 25, which will be described later, provided in the expansion valve unit 20.
  • the alarm device 33a is installed in the air-conditioned space, and when the leakage of the refrigerant is detected, the user is notified of the leakage of the refrigerant.
  • the alarm device 33a is provided with a notification means (not shown) such as a display means or a voice output means, and when the refrigerant leakage sensor 32a detects the leakage of the refrigerant, the notification means is used to notify the user of the refrigerant leakage. Can be done.
  • the refrigerant leakage sensor and the alarm device are not limited to this example, and a plurality of refrigerant leakage sensors and alarm devices may be provided depending on the number and size of the air-conditioned spaces.
  • the remote controller 34a is a device used for the user to remotely control the air conditioner 1.
  • the remote controller 34a includes a communication means (not shown) that communicates wirelessly or by wire, and the set temperature, operation, and the like are set based on the operation by the user.
  • Various kinds of set information are supplied to the outdoor control device 15.
  • the expansion valve unit 20 includes gas-side shutoff valves 21a and 21b, liquid-side shutoff valves 22a and 22b, expansion valves 23a and 23b, and a repeater control device 25.
  • the gas-side shutoff valves 21a and 21b and the liquid-side shutoff valves 22a and 22b are provided corresponding to the indoor units 30a and 30b connected to the expansion valve unit 20, respectively.
  • two gas-side shutoff valves 21a and 21b and a liquid-side shutoff valve 22a and 22b are provided, respectively, but this is not limited to this example.
  • an arbitrary number of gas-side shutoff valves and liquid-side shutoff valves can be provided depending on the number of indoor units connected to the expansion valve unit 20.
  • the gas side shutoff valves 21a and 21b and the liquid side shutoff valves 22a and 22b have the same configuration, respectively. Therefore, in the following, the gas side shutoff valve 21a and the liquid side shutoff valve 22a will be described as an example.
  • the gas side shutoff valve 21a opens or closes the refrigerant flowing from the indoor unit 30a to the outdoor unit 10.
  • the gas side shutoff valve 21a is provided in a pipe connecting the suction side of the compressor 11 of the outdoor unit 10 and the refrigerant outflow side of the indoor heat exchanger 31a of the indoor unit 30a, and the pipe is opened. Or shut off.
  • the gas side shutoff valve 21a is controlled by the repeater control device 25.
  • the liquid side shutoff valve 22a opens or shuts off the refrigerant flowing from the outdoor unit 10 to the indoor unit 30a.
  • the gas side shutoff valve 21a is provided in a pipe connecting the expansion valve 23a and the refrigerant inflow side of the indoor heat exchanger 31a, and opens or shuts off the pipe.
  • the liquid side shutoff valve 22a is controlled by the repeater control device 25.
  • the gas side shutoff valves 21a and 21b and the liquid side shutoff valves 22a and 22b are composed of solenoid valves that are "closed" when the power supply is lost. That is, the gas-side shutoff valves 21a and 21b and the liquid-side shutoff valves 22a and 22b are controlled by the repeater control device 25 so as to shut off the flow of the refrigerant when the power supply is lost.
  • the expansion valve 23a is provided corresponding to the indoor unit 30a and depressurizes the refrigerant to expand it.
  • the expansion valve 23a is composed of, for example, an electronic expansion valve or a valve capable of controlling the opening degree.
  • the opening degree of the expansion valve 23a is controlled by the control device 30.
  • the expansion valve 23b is provided corresponding to the indoor unit 30b, and has the same configuration as the expansion valve 23a.
  • the repeater control device 25 controls each part provided in the expansion valve unit 20.
  • the repeater control device 25 when the refrigerant leakage sensors 32a and 32b detect the leakage of the refrigerant, the repeater control device 25 includes the gas side shutoff valves 21a and 21b, and the liquid side shutoff valves 22a and 22b. Is controlled to shut off the refrigerant.
  • the refrigerant circuit includes the compressor 11, the outdoor heat exchanger 12, the expansion valve 23a (or 23b), the liquid side shutoff valve 22a (or 22b), and the indoor heat exchanger.
  • the 31a (or 31b), the gas side shutoff valve 21a (or 21b), and the compressor 11 are connected in an annular shape to form the compressor 11.
  • the liquid side shutoff valve 22a (or 22b) is provided between the expansion valve 23a (or 23b) and the indoor heat exchanger 31a (or 31b).
  • the gas side shutoff valve 21a (or 21b) is provided between the indoor heat exchanger 31a (or 31b) and the compressor 11.
  • the high-pressure liquid refrigerant flowing out of the outdoor heat exchanger 12 flows out of the outdoor unit 10 and flows into the expansion valve unit 20.
  • the liquid refrigerant that has flowed into the expansion valve unit 20 is branched and flows into each of the expansion valves 23a and 23b.
  • the liquid refrigerant flowing into the expansion valve 23a expands at the expansion valve 23a and becomes a two-phase state refrigerant in which a low-pressure gas refrigerant and a low-pressure liquid refrigerant are mixed.
  • the refrigerant in the two-phase state flows out from the expansion valve unit 20 via the liquid-side shutoff valve 22a.
  • the two-phase refrigerant flowing out of the expansion valve unit 20 flows into the indoor unit 30a and flows into the indoor heat exchanger 31a functioning as an evaporator.
  • the indoor heat exchanger 31a heat exchange is performed between the flowing two-phase state refrigerant and the outdoor air. As a result, the liquid refrigerant of the two-phase refrigerant evaporates to become a low-pressure gas refrigerant.
  • the low-pressure gas refrigerant flowing out of the indoor heat exchanger 31a flows out of the indoor unit 30a and flows into the expansion valve unit 20.
  • the liquid refrigerant flowing into the expansion valve 23b expands at the expansion valve 23b and becomes a two-phase state refrigerant in which a low-pressure gas refrigerant and a low-pressure liquid refrigerant are mixed.
  • the refrigerant in the two-phase state flows out from the expansion valve unit 20 via the liquid-side shutoff valve 22b.
  • the two-phase refrigerant flowing out of the expansion valve unit 20 flows into the indoor unit 30b and flows into the indoor heat exchanger 31b that functions as an evaporator.
  • the indoor heat exchanger 31b heat exchange is performed between the flowing two-phase refrigerant and the outdoor air. As a result, the liquid refrigerant of the two-phase refrigerant evaporates to become a low-pressure gas refrigerant.
  • the low-pressure gas refrigerant flowing out of the indoor heat exchanger 31b flows out of the indoor unit 30b and flows into the expansion valve unit 20.
  • the refrigerant circulates in the refrigerant circuit.
  • the repeater control device 25 When the refrigerant leaks into the air-conditioned space while the cooling operation is performed as described above and the refrigerant leakage is detected by the refrigerant leakage sensors 32a and 32b, the repeater control device 25 is based on the detection result. , Judge that it is in the leak detection state. Then, the repeater control device 25 controls so as to close the gas side shutoff valves 21a and 21b and the liquid side shutoff valves 22a and 22b. Further, the repeater control device 25 operates the alarm devices 33a and 33b. As a result, the user is notified of the occurrence of the refrigerant leak.
  • the repeater control device 25 generates an abnormality detection signal indicating that a refrigerant leak has occurred and supplies it to the outdoor control device 15 of the outdoor unit 10.
  • the outdoor control device 15 controls each part of the outdoor unit 10 based on the received abnormality detection signal, and stops the operation of the outdoor unit 10.
  • the notification of the occurrence of an abnormality to the user is not limited to this, and for example, remote controllers 34a and 34b, or display units (not shown) provided on the indoor units 30a and 30b may be used.
  • the liquid is placed between the expansion valves 23a and 23b and the indoor heat exchangers 31a and 31b of the indoor units 30a and 30b so that the refrigerant whose state is unstable does not flow into the expansion valve.
  • Side shutoff valves 22a and 22b are provided.
  • the refrigerant passes through the expansion valves 23a and 23b in a stable pressure state, and then flows into the liquid side shutoff valves 22a and 22b where the pressure loss exists.
  • the refrigerant having a stable pressure state flows into the expansion valves 23a and 23b, the refrigerant passing through the expansion valves 23a and 23b without causing abnormal noise or the like occurs. Appropriate control can be performed.
  • the expansion valve unit 20 is provided with expansion valves 23a and 23b, gas side shutoff valves 21a and 21b, and liquid side shutoff valves 22a and 22b. Further, the liquid side shutoff valves 22a and 22b are provided between the expansion valves 23a and 23b and the indoor heat exchangers 31a and 31b.
  • the air conditioner 1 further includes a refrigerant leak sensor 32a and 32b
  • the expansion valve unit 20 includes a liquid side shutoff valve 22a and 22b, and a gas side shutoff valve 21a and a gas side shutoff valve 21a based on the detection results of the refrigerant leak sensors 32a and 32b. Further, it has a repeater control device 25 for controlling 21b.
  • the liquid side shutoff valves 22a and 22b and the gas side shutoff valves 21a and 21b are closed to shut off the refrigerant, thereby suppressing the leakage of the refrigerant into the room. be able to.
  • the liquid side shutoff valves 22a and 22b and the gas side shutoff valves 21a and 21b are composed of solenoid valves that close when the supplied power is lost. As a result, even if the refrigerant leaks in a state where the power supply is lost, the liquid side shutoff valves 22a and 22b and the gas side shutoff valves 21a and 21b are closed, so that the refrigerant flowing through the refrigerant circuit can be shut off.
  • the air conditioner 1 further includes alarm devices 33a and 33b for notifying the refrigerant leakage when the refrigerant leakage is detected. This makes it possible to notify the user of the refrigerant leakage when the refrigerant leaks into the room.
  • the gas side shutoff valves 21a and 21b and the liquid side shutoff valves 22a and 22b are composed of solenoid valves that close when the supplied power is lost. As a result, even if all the power supplies to the air conditioner 1 are lost, the flow of the refrigerant in the refrigerant circuit can be cut off and the leakage of the refrigerant into the room can be suppressed.
  • Embodiment 2 Next, the second embodiment will be described.
  • the second embodiment is different from the first embodiment in that electric power is supplied to the outdoor unit 10, the refrigerant control system, and the safety device system from different power sources.
  • the same reference numerals are given to the parts common to the first embodiment, and detailed description thereof will be omitted.
  • FIG. 2 is a circuit diagram showing an example of the configuration of the air conditioner according to the second embodiment.
  • the air conditioner 1 is composed of an outdoor unit 10, an expansion valve unit 20, and indoor units 30a and 30b, as in the first embodiment.
  • the repeater control device 25 provided in the expansion valve unit 20 includes a refrigerant control system control unit 51 and a safety device system control unit 52.
  • the refrigerant control system control unit 51 controls the power supply and operation of the equipment belonging to the refrigerant control system.
  • the refrigerant control system control unit 51 is a system composed of each unit constituting the refrigerant circuit.
  • the devices belonging to the refrigerant control system are the expansion valves 23a and 23b, and the indoor units 30a and 30b.
  • the safety device system control unit 52 controls the power supply and operation of the devices belonging to the safety device system.
  • the safety device system is a system consisting of each part constituting the safety device.
  • the devices belonging to the safety device system are gas side shutoff valves 21a and 21b, liquid side shutoff valves 22a and 22b, refrigerant leak sensors 32a and 32b, and alarm devices 33a and 33b.
  • an outdoor power source 61 As the power source connected to the air conditioner 1, an outdoor power source 61, a refrigerant control power source 62, and a safety device power source 63 are provided.
  • the outdoor power supply 61 is connected to the outdoor unit 10 and supplies electric power to each part in the outdoor unit 10 such as the outdoor control device 15 and the compressor 11.
  • the refrigerant control power supply 62 is connected to the expansion valve unit 20 and each part constituting the refrigerant circuit of the indoor units 30a and 30b, and is connected to the refrigerant control system control unit 51, the expansion valves 23a and 23b, and the indoor units 30a and 30b. To supply power.
  • the power supply 63 for the safety device is connected to each part constituting the expansion valve unit 20 and the safety devices of the indoor units 30a and 30b.
  • the safety device power supply 63 supplies power to the safety device system control unit 52, gas side shutoff valves 21a and 21b, liquid side shutoff valves 22a and 22b, refrigerant leakage sensors 32a and 32b, and alarm devices 33a and 33b. do.
  • the safety device system control unit 52 generates an abnormality detection signal indicating that a refrigerant leak has occurred and supplies it to the refrigerant control system control unit 51.
  • the refrigerant control system control unit 51 controls to close the expansion valves 23a and 23b based on the received abnormality detection signal, controls each part of the indoor units 30a and 30b, and stops the operation of the indoor units 30a and 30b. ..
  • the refrigerant control system control unit 51 supplies the abnormality signal received from the safety device system control unit 52 to the outdoor control device 15.
  • the outdoor control device 15 controls each part of the outdoor unit 10 based on the received abnormality detection signal, and stops the operation of the outdoor unit 10.
  • the refrigerant control system control unit 51 detects the power loss to the safety device system control unit 52.
  • each of the refrigerant control system control unit 51 and the safety device system control unit 52 monitors each other's power supply status by receiving a power supply confirmation signal for confirming the power supply status of the other party. Then, each of the refrigerant control system control unit 51 and the safety device system control unit 52 detects the loss of power of the other party when the power supply confirmation signal is interrupted.
  • the refrigerant control system control unit 51 sets the expansion valves 23a and 23b. While controlling to close, each part of the indoor units 30a and 30b is controlled, and the operation of the indoor units 30a and 30b is stopped.
  • the refrigerant control system control unit 51 notifies the outdoor control device 15 of an abnormality (loss of the safety device power supply 63) of the safety device system control unit 52.
  • the outdoor control device 15 controls each part of the outdoor unit 10 and stops the operation of the outdoor unit 10.
  • the refrigerant control system control unit 51 controls the indoor units 30a and 30b. Therefore, when the indoor units 30a and 30b are provided with a display unit or the like (not shown), the refrigerant control system control unit 51 uses the display units of the indoor units 30a and 30b to leak the refrigerant to the user. The occurrence can be notified.
  • the safety device system control unit 52 detects the power loss to the refrigerant control system control unit 51. If the refrigerant leaks in this case, power is supplied to the safety device system control unit 52, so that the gas side shutoff valves 21a and 21b and the liquid side shutoff valves 22a and 22b can be operated. Therefore, the safety device system control unit 52 controls to close the gas side shutoff valves 21a and 21b and the liquid side shutoff valves 22a and 22b. Then, the safety device system control unit 52 operates the alarm devices 33a and 33b to notify the user of the occurrence of the refrigerant leakage.
  • the gas side shutoff valves 21a and 21b and the liquid side shutoff valves 22a and 22b are composed of solenoid valves that close when the power supply is lost. If so, the flow of the refrigerant in the refrigerant circuit is cut off. Therefore, it is possible to suppress the leakage of the refrigerant into the room.
  • the repeater control device 25 is supplied with the power supply 63 for the safety device, and the liquid side shutoff valves 22a and 22b, as well as the gas side shutoff valve 21a and It has a safety device system control unit 52 that controls devices belonging to the safety device system including at least 21b. Further, the repeater control device 25 has a refrigerant control system control unit 51 to which a refrigerant control power supply 62 is supplied and controls equipment belonging to the refrigerant control system including at least expansion valves 23a and 23b.
  • the refrigerant control system and the safety device system operate independently, so that when one of the power supplies is lost.
  • Embodiment 3 Next, the third embodiment will be described.
  • the third embodiment is different from the second embodiment in that the power source for the outdoor unit 10 and the refrigerant control system is shared.
  • the parts common to the first and second embodiments are designated by the same reference numerals, and detailed description thereof will be omitted.
  • FIG. 3 is a circuit diagram showing an example of the configuration of the air conditioner according to the third embodiment.
  • the air conditioner 1 is composed of an outdoor unit 10, an expansion valve unit 20, and indoor units 30a and 30b, as in the first and second embodiments.
  • the repeater control device 25 provided in the expansion valve unit 20 includes a refrigerant control system control unit 51 and a safety device system control unit 52, as in the second embodiment.
  • an outdoor power supply 61 and a safety device power supply 63 are provided as power supplies connected to the air conditioner 1.
  • the outdoor power supply 61 of the third embodiment is connected to the outdoor control device 15 and the refrigerant control system control unit 51 of the outdoor unit 10 to supply electric power to the outdoor control device 15 and the refrigerant control system control unit 51.
  • the safety device power supply 63 is the same as that of the second embodiment.
  • the safety device system control unit 52 generates an abnormality detection signal indicating that a refrigerant leak has occurred and supplies it to the refrigerant control system control unit 51.
  • the refrigerant control system control unit 51 controls the expansion valves 23a and 23b to be closed based on the received abnormality detection signal, and also controls each part of the outdoor unit 10 and the indoor units 30a and 30b to control the outdoor unit 10 and the indoor unit. The operation of 30a and 30b is stopped.
  • the refrigerant control system control unit 51 detects the power loss to the safety device system control unit 52.
  • each of the refrigerant control system control unit 51 and the safety device system control unit 52 monitors each other's power supply state by receiving a power supply confirmation signal from the other party, as in the second embodiment. Then, each of the refrigerant control system control unit 51 and the safety device system control unit 52 detects the loss of power of the other party when the power supply confirmation signal is interrupted.
  • the refrigerant control system control unit 51 sets the expansion valves 23a and 23b. While controlling to close, each part of the indoor units 30a and 30b is controlled, and the operation of the indoor units 30a and 30b is stopped.
  • the refrigerant control system control unit 51 notifies the outdoor control device 15 of an abnormality in the safety device system control unit 52 (loss of the safety device power supply 63).
  • the outdoor control device 15 controls each part of the outdoor unit 10 and stops the operation of the outdoor unit 10.
  • the refrigerant control system control unit 51 controls the indoor units 30a and 30b. Therefore, when the indoor units 30a and 30b are provided with a display unit or the like (not shown), the refrigerant control system control unit 51 uses the display units of the indoor units 30a and 30b to leak the refrigerant to the user. The occurrence can be notified.
  • the safety device system control unit 52 detects the power loss to the refrigerant control system control unit 51. If the refrigerant leaks in this case, power is supplied to the safety device system control unit 52, so that the gas side shutoff valves 21a and 21b and the liquid side shutoff valves 22a and 22b can be operated. Therefore, the safety device system control unit 52 controls to close the gas side shutoff valves 21a and 21b and the liquid side shutoff valves 22a and 22b. Then, the safety device system control unit 52 operates the alarm devices 33a and 33b to notify the user of the occurrence of the refrigerant leakage.
  • the repeater control device 25 is supplied with the power supply 63 for the safety device, and the liquid side shutoff valves 22a and 22b, as well as the gas side shutoff valve 21a and It has a safety device system control unit 52 that controls devices belonging to the safety device system including at least 21b. Further, the repeater control device 25 has a refrigerant control system control unit 51 to which an outdoor power supply 61 is supplied and controls equipment belonging to the refrigerant control system including at least expansion valves 23a and 23b.
  • the refrigerant control system and the safety device system operate independently, so that when one of the power supplies is lost.
  • the present disclosure is not limited to the above-described embodiments 1 to 3, and various modifications and applications are possible without departing from the gist of the present disclosure.
  • the systems for the plurality of indoor units 30a and 30b are included in one expansion valve unit 20, but the present invention is not limited to this, and the expansion valve unit is limited to each system of the indoor unit. May be provided respectively.

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  • General Engineering & Computer Science (AREA)
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PCT/JP2020/031252 2020-08-19 2020-08-19 空気調和装置 Ceased WO2022038708A1 (ja)

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Cited By (5)

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