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WO2015072342A1 - Climatiseur - Google Patents

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Publication number
WO2015072342A1
WO2015072342A1 PCT/JP2014/078936 JP2014078936W WO2015072342A1 WO 2015072342 A1 WO2015072342 A1 WO 2015072342A1 JP 2014078936 W JP2014078936 W JP 2014078936W WO 2015072342 A1 WO2015072342 A1 WO 2015072342A1
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WO
WIPO (PCT)
Prior art keywords
refrigerant
heat exchanger
air conditioner
outdoor heat
compressor
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/JP2014/078936
Other languages
English (en)
Japanese (ja)
Inventor
荒屋　享司
平良　繁治
秀紀 三軒家
昭夫 田坂
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.)
Daikin Industries Ltd
Original Assignee
Daikin Industries Ltd
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 Daikin Industries Ltd filed Critical Daikin Industries Ltd
Publication of WO2015072342A1 publication Critical patent/WO2015072342A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • F25B49/005—Arrangement or mounting of control or safety devices of safety devices
    • 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
    • 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
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/023—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units
    • F25B2313/0233—Compression machines, plants or systems with reversible cycle not otherwise provided for using multiple indoor units in parallel arrangements
    • 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
    • F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
    • F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
    • F25B2313/02741—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using one four-way valve

Definitions

  • the present invention relates to an air conditioner including a refrigerant circuit, for example.
  • An air conditioner is generally provided with a refrigerant circuit having an outdoor heat exchanger.
  • most of the refrigerant is exchanged with the outdoor unit when the compressor is stopped after operation in order to prevent leakage of refrigerant into the room when the piping of the refrigerant circuit is damaged.
  • Some are controlled so as to be closed in a container (for example, Patent Document 1).
  • coolant is often enclosed by the outdoor heat exchanger of an outdoor unit by pump down driving
  • the compressor and the outdoor heat exchanger may communicate with each other via the four-way switching valve in a state where the refrigerant is confined in the outdoor unit.
  • many refrigerants move from the outdoor heat exchanger into the compressor, and many refrigerants and refrigeration oil are mixed in the compressor. Therefore, for example, when the compressor is started, the refrigeration oil is easily discharged from the compressor together with the refrigerant, and there is a problem that the reliability of the compressor is lowered.
  • an object of the present invention is to provide an air conditioner that can improve the reliability of the compressor by preventing the refrigerant from moving from the outdoor heat exchanger into the compressor when the refrigerant is confined in the outdoor unit. It is to be.
  • An air conditioner includes a refrigerant circuit in which a compressor, a four-way switching valve, an outdoor heat exchanger, and an indoor heat exchanger are connected, and the four-way switching valve includes the compression circuit A first state in which the discharge side of the compressor communicates with the outdoor heat exchanger side and the suction side of the compressor communicates with the indoor heat exchanger side, and the discharge side of the compressor and the indoor heat exchanger And a second state in which the suction side of the compressor and the outdoor heat exchanger side are in communication with each other, wherein the refrigerant circuit includes the indoor heat exchanger and the outdoor heat exchange. And a second closing mechanism arranged between the outdoor heat exchanger and the four-way switching valve.
  • the outdoor heat exchanger and the four-way switching valve are connected in a state where the refrigerant is closed in the outdoor heat exchanger. Since the space can be closed by the second closing mechanism, the compressor and the outdoor heat exchanger do not communicate with each other. Therefore, in a state where the refrigerant is confined in the outdoor unit, the refrigerant does not move from the outdoor heat exchanger into the compressor, so that a large amount of refrigerant and refrigerating machine oil are not mixed in the compressor. Reliability can be improved.
  • the compressor, the four-way switching valve, the outdoor heat exchanger, the first closing mechanism, and the second closing mechanism are: It is arranged inside the outdoor unit.
  • the refrigerant can be confined only inside the outdoor unit.
  • the refrigerant circuit is a flow rate adjustment disposed between the outdoor heat exchanger and the indoor heat exchanger.
  • the first closing mechanism is an electromagnetic valve different from the motor-operated valve.
  • an electromagnetic valve is used as the first closing mechanism for confining the refrigerant in the outdoor heat exchanger. It can be reliably trapped in the heat exchanger.
  • the first closing mechanism and the second closing mechanism are closed when not energized. It is characterized by being configured.
  • An air conditioner according to a fifth invention is the air conditioner according to any one of the first to fourth inventions, wherein the refrigerant circuit includes a plurality of the indoor heat exchangers, and the outdoor heat exchange.
  • a first header connected between the heat exchanger and the plurality of indoor heat exchangers, a second header connected between the four-way switching valve and the plurality of indoor heat exchangers, and the first header And the second header are connected to each other, and the indoor heat exchanger is provided with a plurality of branch paths.
  • This air conditioner can improve the reliability of the compressor even in a refrigerant circuit in which a plurality of indoor heat exchangers are connected to one outdoor heat exchanger.
  • the refrigerant circuit in the air conditioner according to any of the fifth aspects of the invention, includes the first header and the indoor heat exchanger in each of the plurality of branch paths.
  • a third closing mechanism disposed between the second header and the indoor heat exchanger.
  • the fourth closing mechanism is disposed between the second header and the indoor heat exchanger.
  • the air conditioner according to a seventh aspect of the invention is characterized in that, in the air conditioner according to the sixth aspect of the invention, pressure sensors for detecting refrigerant leakage are respectively disposed in the plurality of branch paths.
  • the pressure sensor in the air conditioner according to any of the seventh inventions, includes the third closing mechanism and the fourth closing described above in each of the plurality of branch paths. It is arrange
  • the branch circuit in which the refrigerant leaks can be identified.
  • An air conditioner according to a ninth invention is the air conditioner according to any of the fifth to eighth inventions, wherein the first header and the second header are arranged inside an outdoor unit,
  • the outdoor unit includes a plurality of pipe connection portions that are connected to either the first header or the second header and to which pipes for connecting the indoor units are connected.
  • This air conditioner can improve the reliability of the compressor even in an outdoor unit to which a plurality of indoor units are connected.
  • the refrigerant is an R32 refrigerant.
  • the reliability of the compressor can be improved even when R32 refrigerant having a slight flammability is used as the refrigerant.
  • the compressor and the outdoor heat exchanger do not communicate with each other. Therefore, in a state where the refrigerant is closed in the outdoor heat exchanger, the refrigerant does not move from the outdoor heat exchanger into the compressor, so that many refrigerants and refrigeration oil are not mixed in the compressor, The reliability of the compressor can be improved.
  • the refrigerant can be confined only inside the outdoor unit.
  • the electromagnetic valve is used as the first closing mechanism for confining the refrigerant in the outdoor heat exchanger
  • the refrigerant is placed in the outdoor rather than the case where the electric valve for flow rate adjustment is used as the first closing mechanism. It can be reliably trapped in the heat exchanger.
  • the solenoid valve is in the closed state, so that the state in which the refrigerant is closed is maintained.
  • the reliability of the compressor can be improved even in a refrigerant circuit in which a plurality of indoor heat exchangers are connected to one outdoor heat exchanger.
  • the sixth invention when there is a refrigerant leak in any of the plurality of branch circuits, only the branch circuit in which the refrigerant leaks can be closed among the plurality of branch circuits.
  • the refrigerant leakage in the refrigerant circuit can be detected without arranging the refrigerant leakage detection sensor in both the indoor unit and the outdoor unit.
  • the branch circuit in which the refrigerant leaks can be specified.
  • the reliability of the compressor can be improved even in an outdoor unit to which a plurality of indoor units are connected.
  • the reliability of the compressor can be improved even when an R32 refrigerant having a slight flammability is used as the refrigerant.
  • the air conditioner 1 of this embodiment is provided with the three indoor units 2 each installed indoors, and the outdoor unit 3 installed outdoors.
  • the indoor unit 2 has a liquid side connection part 2a to which the liquid side pipe 5 is connected and a gas side connection part 2b to which the gas side pipe 6 is connected. It has the liquid side connection part 3a connected, and the gas side connection part 3b to which the gas side piping 6 is connected.
  • the liquid side connection part 2a of the indoor unit 2 and the liquid side connection part 3a of the outdoor unit 3 are connected by the liquid side pipe 5, and the gas side connection part 2b of the indoor unit 2 and the outdoor unit
  • the gas side connection part 3 b of the machine 3 is connected by a gas side pipe 6.
  • the air conditioner 1 includes a refrigerant circuit configured by an indoor unit 2, an outdoor unit 3, a liquid side pipe 5, and a gas side pipe 6.
  • the refrigerant circuit is configured by connecting a compressor 10, a four-way switching valve 11, an outdoor heat exchanger 13, and three indoor heat exchangers 16, and includes the compressor 10, the four-way switching valve 11, and the outdoor.
  • the heat exchanger 13 is arranged inside the outdoor unit 3, and the three indoor heat exchangers 16 are arranged inside the three indoor units 2, respectively.
  • R32 refrigerant is used as the refrigerant.
  • the four-way switching valve 11 communicates the discharge side of the compressor 10 and the outdoor heat exchanger 13 side, and the cooling state (first state) that communicates the suction side of the compressor 10 and the indoor heat exchanger 16 side. And a heating state (second state) in which the discharge side of the compressor 10 and the indoor heat exchanger 16 side are communicated and the suction side of the compressor 10 and the outdoor heat exchanger 13 side are communicated. To get.
  • an electromagnetic valve 12 is disposed between the four-way switching valve 11 and the outdoor heat exchanger 13.
  • the electromagnetic valve 12 can take either an open state or a closed state, and is controlled by the control unit 50.
  • the electromagnetic valve 12 corresponds to a second closing mechanism disposed between the outdoor heat exchanger 13 and the four-way switching valve 11 in the present invention.
  • a liquid closing valve 20 is disposed on the indoor unit 2 side from the outdoor heat exchanger 13, and a gas closing valve 21 is disposed on the indoor unit 2 side from the four-way switching valve 11. Is placed.
  • the liquid closing valve 20 and the gas closing valve 21 can take either an open state or a closed state, respectively, and are switched manually.
  • a first header 30 is disposed on the side of the indoor unit 2 (between the outdoor heat exchanger 13 and the plurality of indoor heat exchangers 16) from the liquid closing valve 20, and the gas is closed.
  • a second header 31 is arranged on the side of the indoor unit 2 from the valve 21 (between the four-way switching valve 11 and the plurality of indoor heat exchangers 16).
  • the refrigerant circuit from the outdoor heat exchanger 13 is branched into three in the first header 30 and connected to the three liquid side connection portions 3a of the outdoor unit 3, respectively.
  • the refrigerant circuit from the four-way switching valve 11 is branched into three in the second header 31 and connected to the three gas side connection portions 3b of the outdoor unit 3, respectively. Therefore, the refrigerant circuit connects the first header 30 and the second header 31, and has three branch paths in which the indoor heat exchangers 2 are respectively arranged.
  • the motor-operated valve 14 is disposed between the first header 30 and the liquid side connection portion 3a.
  • the motor-operated valve 14 can take a plurality of openings corresponding to the open state and the closed state, and is controlled by the control unit 50.
  • the electric valve 14 adjusts the refrigerant flow rate in the branch circuit for flow rate adjustment, and also has a function as an expansion valve.
  • the motor operated valve 14 is a motor operated valve that is closed when not energized.
  • the motor-operated valve 14 corresponds to the first closing mechanism disposed between the indoor heat exchanger 16 and the outdoor heat exchanger 13 in the present invention, and the first header 30 and the indoor heat exchanger. 16 corresponds to the third closing mechanism arranged between the two.
  • the solenoid valve 15 is disposed between the second header 31 and the gas side connection portion 3b.
  • the electromagnetic valve 15 can take either an open state or a closed state, and is controlled by the control unit 50. Further, the electromagnetic valve 15 is an electromagnetic valve that is closed when not energized. In the present embodiment, the electromagnetic valve 15 corresponds to a fourth closing mechanism disposed between the second header 31 and the indoor heat exchanger 16.
  • the air conditioner 1 can be operated in the cooling operation mode and the heating operation mode, and the remote controller selects one of the operations to perform the operation start operation, the operation switching operation, the operation stop operation, and the indoor temperature. An operation for changing the set temperature can be performed.
  • the refrigerant discharged from the compressor 10 sequentially flows from the four-way switching valve 11 to the outdoor heat exchanger 12, the electric valve 14, and the indoor heat exchanger 16 as indicated by the broken line arrows in the figure.
  • a cooling cycle is formed in which the refrigerant that has passed through the exchanger 16 returns to the compressor 10 through the four-way switching valve 11. That is, the outdoor heat exchanger 13 functions as a condenser, and the indoor heat exchanger 16 functions as an evaporator.
  • the refrigerant discharged from the compressor 10 is transferred from the four-way switching valve 11 to the indoor heat exchanger 16 and the motor-operated valve 14 as indicated by solid arrows in the figure. Then, a heating cycle is formed in which the refrigerant flows in order to the outdoor heat exchanger 13 and the refrigerant that has passed through the outdoor heat exchanger 13 returns to the compressor 10 through the four-way switching valve 11. That is, the indoor heat exchanger 16 functions as a condenser and the outdoor heat exchanger 13 functions as an evaporator.
  • the three indoor units 2 are each provided with a refrigerant leak detection sensor 17, and the outdoor unit 3 is provided with a refrigerant leak detection sensor 18.
  • the refrigerant leak detection sensors 17 and 18 are connected to the control unit 50 of the air conditioner 1, and output a signal indicating refrigerant leak detection to the control unit 50 when refrigerant leakage is detected. Therefore, in the air conditioner 1 of the present embodiment, the refrigerant leak detection sensor 17 can detect the refrigerant leak in the room and the refrigerant leak detection sensor 18 can detect the refrigerant leak in the room.
  • the control unit 50 of the air conditioner 1 includes a compressor 10, a four-way switching valve 11, an electromagnetic valve 12, three electric valves 14, three electromagnetic valves 15, 3 Two refrigerant leak detection sensors 17 and a refrigerant leak detection sensor 18 are connected to each other. Therefore, the control unit 50 can control the solenoid valve 12, the three motor-operated valves 14, and the three solenoid valves 15 when the refrigerant leak detection sensors 17 and 18 detect refrigerant leaks indoors and outdoors.
  • the cooling operation includes a dehumidifying operation.
  • the cooling operation it is determined whether or not a refrigerant leak is detected by the refrigerant leak detection sensors 17 and 18 (S2), and this is repeated until a refrigerant leak is detected.
  • the motor-operated valve 14 the closing mechanism on the downstream side in the refrigerant flow direction from the outdoor heat exchanger 13
  • S3 the motor-operated valve 14 is closed.
  • the cooling operation is continued (S4).
  • the refrigerant in the refrigerant circuit is prevented from flowing downstream (in the indoor unit side) in the refrigerant flow direction from the motor operated valve 14, and the refrigerant in the refrigerant circuit is sequentially stored in the outdoor heat exchanger 13.
  • the electromagnetic valve 12 (a closing mechanism on the upstream side in the refrigerant flow direction from the outdoor heat exchanger 13) is closed at a predetermined timing (S5), and the cooling operation is stopped (S6). Therefore, since the refrigerant stored in the outdoor heat exchanger 13 is confined between the motor-operated valve 14 and the electromagnetic valve 12, a large amount of refrigerant is stored indoors when the refrigerant pipe is damaged and refrigerant leaks. Or leakage outside the room is prevented.
  • the timing for closing the electromagnetic valve 12 is preferably after most of the refrigerant in the refrigerant circuit is stored in the outdoor heat exchanger 13.
  • a predetermined time from when the motor-operated valve 14 is closed until most of the refrigerant in the refrigerant circuit is stored in the outdoor heat exchanger 13 is determined in advance, and the electromagnetic valve 12 is closed when the predetermined time elapses. May be.
  • the refrigerant mainly stays on the outdoor unit 3 side. Therefore, in the control of the air conditioner 1, since the refrigerant on the outdoor unit 3 side does not move to the indoor unit 2 side, for example, when the refrigerant pipe on the indoor unit 2 side is broken, a large amount of refrigerant may leak into the room. It is suppressed. Further, in the control of the air conditioner 1, since the refrigerant staying on the outdoor unit 3 side can be quickly stored in the outdoor heat exchanger 13, for example, when the refrigerant pipe on the outdoor unit 3 side is damaged, a large amount of refrigerant is discharged to the outside. Leakage is suppressed.
  • Whether or not the refrigerant has leaked on the outdoor unit side is, for example, that the refrigerant leak has been detected by the refrigerant leak detection sensor 17 disposed in the outdoor unit 3 or the refrigerant disposed in the indoor unit 2. Judgment is made based on whether or not the leak is detected by the leak detection sensor 18.
  • each refrigerant leak detection sensor 17 disposed in each of the three indoor units 2 leaks the refrigerant.
  • the branching path where the refrigerant has occurred is specified, and the motor-operated valve 14 and the electromagnetic valve 15 connected to the branching path where the refrigerant leaked are closed (S16). Then, the motor-operated valve 14 and the electromagnetic valve 15 connected to the branch path where no refrigerant leaks are maintained, and the electromagnetic valve 12 (the closing mechanism downstream of the outdoor heat exchanger 13 in the refrigerant flow direction) is closed.
  • the heating operation is continued with the solenoid valve 12 being closed (S18).
  • the refrigerant in the refrigerant circuit is prevented from flowing downstream in the refrigerant flow direction from the solenoid valve 12, and the refrigerant in the refrigerant circuit is sequentially stored in the outdoor heat exchanger 13.
  • the remaining motor-operated valve 14 (the closing mechanism on the upstream side in the refrigerant flow direction with respect to the outdoor heat exchanger 13) and the electromagnetic valve 15 connected to the branch path where refrigerant leakage does not occur at a predetermined timing are closed (S19). ), The heating operation is stopped (S15).
  • the timing for closing the motor-operated valve 14 is preferably after most of the refrigerant in the refrigerant circuit is stored in the outdoor heat exchanger 13 as in the timing for closing the solenoid valve 12 during the cooling operation. .
  • the refrigerant mainly stays on the indoor unit 2 side. Therefore, in the control of the air conditioner 1, when the refrigerant leaks on the outdoor unit 3 side, the refrigerant staying on the indoor unit 2 side is confined between the electric valve 14 and the electromagnetic valve 15. Therefore, it is suppressed that the refrigerant on the indoor unit 2 side moves to the outdoor unit 3 side and a large amount of refrigerant leaks outside. Further, in the control of the air conditioner 1, when the refrigerant leaks on the indoor unit 2 side, the branch path where the refrigerant leaks is blocked from the other refrigerant circuits by the motor operated valve 14 and the electromagnetic valve 15. Thus, a large amount of refrigerant is prevented from leaking into the room from the branch path where the refrigerant leakage has occurred.
  • the electromagnetic valve 12 (the closing mechanism on the upstream side in the refrigerant flow direction from the outdoor heat exchanger 13) is closed (S26), and the cooling operation is stopped (S27).
  • the timing for closing the solenoid valve 12 is preferably after most of the refrigerant in the refrigerant circuit is stored in the outdoor heat exchanger 13.
  • the refrigerant circuit has the three branch paths in which the first header 30 and the second header 31 are respectively connected and the indoor heat exchanger 16 is respectively arranged.
  • the reliability of the compressor 10 can be improved.
  • the refrigerant circuit includes the motor-operated valve 14 disposed between the first header 30 and the indoor heat exchanger 16 in each of the three branch paths, the second header 31, and Since the electromagnetic valve 15 is disposed between the indoor heat exchanger 16 and the refrigerant leaks in any of the three branch circuits, the branch in which the refrigerant leaks out of the three branch circuits. Only the circuit can be closed.
  • the outdoor unit is connected to one of the first header 30 and the second header 31, and a plurality of pipe connecting portions 3a to which pipes for connecting the indoor unit are connected, Since it has 3b, also in the outdoor unit 3 to which the some indoor unit 2 is connected, the reliability of the compressor 10 can be improved.
  • R32 refrigerant having a slight flammability is used as the refrigerant. Even in this case, the reliability of the compressor can be improved. Even when R32 refrigerant is used as the refrigerant, there is no problem due to refrigerant leakage because the refrigerant is trapped in the outdoor unit 3 (outdoor heat exchanger 13) even when there is a refrigerant leak.
  • (Second Embodiment) 6 to 9 show a second embodiment of the present invention.
  • the refrigerant leak detection sensors 17 and 18 are arranged in the indoor unit 2 and the outdoor unit 3 in order to detect refrigerant leakage, whereas the air conditioner of the second embodiment.
  • the machine 101 is greatly different in that the pressure sensor 117 is disposed in the outdoor unit 3. Since other configurations are substantially the same as those in the first embodiment, the description thereof is omitted.
  • the motor-operated valve 14 is disposed between the first header 30 and the liquid side connection portion 3 a in each of the three branch paths.
  • a pressure sensor 117 is disposed between the motor-operated valve 14 and the liquid side connection portion 3a. Therefore, the pressure sensor 117 is disposed closer to the indoor heat exchanger 16 than the motor operated valve 14 in each of the three branch paths.
  • the pressure sensor 117 detects the refrigerant pressure in the refrigerant circuit (in the branch path), and is connected to the control unit 50 of the air conditioner 1 and transmits a signal indicating the refrigerant pressure in the refrigerant circuit to the control unit. 50 is output. Therefore, in the air conditioner 101 of the present embodiment, the control unit 50 can monitor the refrigerant pressure in the refrigerant circuit (in the branch path), and based on the refrigerant pressure, in the refrigerant circuit (in the branch path). Can detect refrigerant leakage.
  • the control part 50 of the air conditioner 101 of 2nd Embodiment has a refrigerant
  • the refrigerant leak detection unit detects refrigerant leak in the refrigerant circuit (in the branch path) based on the output from the pressure sensor 117.
  • the refrigerant leak detection unit of the present embodiment stores, for example, the refrigerant pressure for various operating states (for example, the temperature of the indoor heat exchanger 16) when there is no refrigerant leak in the refrigerant circuit (branch path).
  • the refrigerant pressure detected by the pressure sensor 117 is lower than the stored refrigerant pressure by a predetermined amount or more, it is detected that the refrigerant is leaking in the refrigerant circuit (in the branch path).
  • the refrigerant leakage detection unit when refrigerant leakage is detected by the refrigerant leakage detection unit, all the motor-operated valves 14 and the electromagnetic valves 15 of the three branch paths are closed, and the pressure sensors 117 of the respective branch paths. Based on the refrigerant pressure detected by the above, it is detected whether there is a refrigerant leak in any of the three branch paths.
  • the refrigerant pressures of the three branch paths there is a branch path that is lower than the refrigerant pressure by a predetermined amount or more with respect to various operating states (for example, the temperature of the indoor heat exchanger 16) when there is no refrigerant leak in the refrigerant circuit When it is detected that the refrigerant is leaking in the branch path.
  • various operating states for example, the temperature of the indoor heat exchanger 16
  • there is no branch path that is lower than the refrigerant pressure by a predetermined amount or more with respect to various operating states for example, the temperature of the indoor heat exchanger 16
  • the control unit 50 of the air conditioner 101 of the second embodiment includes a compressor 10, a four-way switching valve 11, a solenoid valve 12, three motor-operated valves 14, and three solenoids.
  • the valve 15 and the three pressure sensors 117 are connected to each other. Therefore, the control unit 50 controls the solenoid valve 12, the three motor-operated valves 14, and the three solenoid valves 15 when detecting refrigerant leakage in the refrigerant circuit (in the branch path) based on the output from the pressure sensor 117. it can.
  • control (flow) of the air conditioner of this embodiment will be described with reference to FIGS. Note that the control of the air conditioner when the operation of the air conditioner is stopped is the same as that in the first embodiment, and the description thereof is omitted.
  • the refrigerant in the refrigerant circuit is prevented from flowing downstream (in the indoor unit side) in the refrigerant flow direction from the motor operated valve 14, and the refrigerant in the refrigerant circuit is sequentially stored in the outdoor heat exchanger 13.
  • the electromagnetic valve 12 (a closing mechanism on the upstream side in the refrigerant flow direction from the outdoor heat exchanger 13) is closed at a predetermined timing (S205), and the cooling operation is stopped (S206). Therefore, since the refrigerant stored in the outdoor heat exchanger 13 is confined between the motor-operated valve 14 and the electromagnetic valve 12, a large amount of refrigerant is stored indoors when the refrigerant pipe is damaged and refrigerant leaks. Or leakage outside the room is prevented.
  • the timing for closing the electromagnetic valve 12 is preferably after most of the refrigerant in the refrigerant circuit is stored in the outdoor heat exchanger 13, as in the first embodiment.
  • the remaining motor-operated valve 14 and electromagnetic valve 15 connected to the branch path where refrigerant leakage does not occur at a predetermined timing are closed (S209), and the heating operation is stopped (S215).
  • the timing for closing the motor-operated valve 14 is preferably after most of the refrigerant in the refrigerant circuit is stored in the outdoor heat exchanger 13, similarly to the timing for closing the electromagnetic valve 12 during the cooling operation. .
  • coolant leakage detection is each arrange
  • FIG. 10 to 14 show a third embodiment of the present invention.
  • the air conditioner 1 of the first embodiment three (a plurality of) indoor heat exchangers are connected to one outdoor heat exchanger 3, whereas in the air conditioner 201 of the third embodiment, The difference is that one indoor heat exchanger is connected to one outdoor heat exchanger 3. Since other configurations are substantially the same as those in the first embodiment, the description thereof is omitted.
  • the air conditioner 201 of this embodiment includes one indoor unit 2 installed indoors and an outdoor unit 3 installed outdoor.
  • the air conditioner 201 includes a refrigerant circuit configured by the indoor unit 2, the outdoor unit 3, the liquid side pipe 5, and the gas side pipe 6.
  • the refrigerant circuit is formed by connecting the compressor 10, the four-way switching valve 11, the outdoor heat exchanger 13, and one indoor heat exchanger 16.
  • an electric valve 14 is disposed between the outdoor heat exchanger 13 and the indoor heat exchanger 16.
  • the motor-operated valve 14 can take a plurality of openings corresponding to the open state and the closed state, and is controlled by the control unit 50.
  • the electric valve 14 adjusts the refrigerant flow rate in the branch circuit for flow rate adjustment, and also has a function as an expansion valve.
  • an electromagnetic valve 212 is disposed between the outdoor heat exchanger 13 and the motor operated valve 14.
  • the electromagnetic valve 212 can take either an open state or a closed state, and is controlled by the control unit 50.
  • the electromagnetic valve 212 corresponds to a first closing mechanism disposed between the indoor heat exchanger 16 and the outdoor heat exchanger 13 in the present invention.
  • the control unit 50 of the air conditioner 201 includes a compressor 10, a four-way switching valve 11, an electromagnetic valve 12, an electric valve 14, an electromagnetic valve 212, and a refrigerant leak detection sensor 17.
  • the refrigerant leakage detection sensor 18 is connected to each other. Therefore, the control unit 50 can control the electromagnetic valve 12 and the electromagnetic valve 212 when refrigerant leakage detection sensors 17 and 18 detect refrigerant leakage indoors or outdoors.
  • the cooling operation includes a dehumidifying operation.
  • the cooling operation it is determined whether or not refrigerant leakage has been detected by the refrigerant leakage detection sensors 17 and 18 (S302), and this is repeated until refrigerant leakage is detected.
  • the electromagnetic valve 212 the closing mechanism on the downstream side in the refrigerant flow direction from the outdoor heat exchanger 13
  • S303 the electromagnetic valve 212 is closed.
  • the cooling operation is continued as it is (S304).
  • the refrigerant in the refrigerant circuit is prevented from flowing downstream (in the indoor unit side) in the refrigerant flow direction with respect to the electromagnetic valve 212, and the refrigerant in the refrigerant circuit is sequentially stored in the outdoor heat exchanger 13.
  • coolant flow direction upstream rather than the outdoor heat exchanger 13 is closed at predetermined timing (S305), and air_conditionaing
  • the timing for closing the electromagnetic valve 12 is preferably after most of the refrigerant in the refrigerant circuit is stored in the outdoor heat exchanger 13, as in the first embodiment.
  • the electromagnetic valve 212 (a closing mechanism upstream of the outdoor heat exchanger 13 in the refrigerant flow direction) is closed (S315), and the heating operation is stopped (S316). Therefore, since the refrigerant stored in the outdoor heat exchanger 13 is confined between the electromagnetic valve 212 and the electromagnetic valve 12, a large amount of refrigerant leaks indoors or outdoors when refrigerant leakage occurs. Is prevented.
  • the timing for closing the electromagnetic valve 212 is preferably after most of the refrigerant in the refrigerant circuit is stored in the outdoor heat exchanger 13, similarly to the timing for closing the electromagnetic valve 12 during the cooling operation. .
  • the solenoid valve 12 which hits a refrigerant
  • S26 the refrigerant stored in the outdoor heat exchanger 13 is confined between the solenoid valve 212 and the solenoid valve 12
  • a large amount of refrigerant is generated when the refrigerant pipe is damaged and refrigerant leaks. Leakage indoors or outdoors is prevented.
  • the timing for closing the electromagnetic valve 12 is preferably after most of the refrigerant in the refrigerant circuit is stored in the outdoor heat exchanger 13.
  • the solenoid valve 12 (a closing mechanism on the upstream side in the refrigerant flow direction from the outdoor heat exchanger 13) is closed (S326), and the cooling operation is stopped (S327).
  • the timing for closing the solenoid valve 12 is preferably after most of the refrigerant in the refrigerant circuit is stored in the outdoor heat exchanger 13.
  • the refrigerant circuit includes the electric valve 14 for adjusting the flow rate arranged between the outdoor heat exchanger 13 and the indoor heat exchanger 16, the outdoor heat exchanger 13 and the electric valve. 14 and a solenoid valve 212 different from the motor-operated valve 14 disposed between the motor-operated valve 14 and the solenoid valve 212 is used to confine the refrigerant in the outdoor heat exchanger 13.
  • the refrigerant can be reliably trapped in the outdoor heat exchanger 13 as compared with the case where is used.
  • the second closing mechanism electromagnagnetic valve 12
  • the compressor 10, the four-way switching valve 11, the outdoor heat exchanger 13, and the refrigerant are confined in the outdoor heat exchanger 13. Therefore, the first closing mechanism and the second closing mechanism may not be disposed inside the outdoor unit 3.
  • the refrigerant circuit includes the electric valve 14 for flow rate adjustment disposed between the outdoor heat exchanger 13 and the indoor heat exchanger 16, and the refrigerant is supplied to the refrigerant circuit.
  • the motor-operated valve 14 is used as the first closing mechanism for confining in the outdoor heat exchanger 13
  • an electromagnetic valve different from the motor-operated valve 14 is used as the first closing mechanism. It is arranged between the outdoor heat exchanger 13 and the indoor heat exchanger 16, and its electromagnetic valve may be used to confine the refrigerant in the outdoor heat exchanger 13.
  • the first closing mechanism (motor valve 14) and the second closing mechanism (electromagnetic valve 12) for confining the refrigerant in the outdoor heat exchanger 13 are configured to be in a closed state when not energized. Although the case where it is performed has been described, it may not be configured to be in a closed state when not energized.
  • the refrigerant circuit includes the third closing mechanism disposed between the first header 30 and the indoor heat exchanger 16 in each of the plurality of branch paths, and the second Although the case where it has the 4th closing mechanism arranged between header 31 and indoor heat exchanger 16 was explained, the 3rd closing mechanism and the 4th closing mechanism are arranged in each of a plurality of branching paths. It doesn't have to be done.
  • the pressure for detecting the refrigerant leak is provided in the plurality of branches.
  • a temperature sensor for detecting refrigerant leakage may be provided.
  • the pressure sensor 117 is disposed between the third closing mechanism (electric valve 14) and the fourth closing mechanism (electromagnetic valve 15) in each of the plurality of branch paths. As described above, the pressure sensor 117 may not be disposed between the third closing mechanism (the electric valve 14) and the fourth closing mechanism (the electromagnetic valve 15) in each of the plurality of branch paths.
  • the first header 30 and the second header 31 are disposed inside the outdoor unit 3, and the outdoor unit 3 includes the first header 30 and the second header 31.
  • the branch unit may be connected to the indoor unit 2 and the outdoor unit 3 via the branch unit.
  • the reliability of the compressor can be improved by preventing the refrigerant from moving from the outdoor heat exchanger into the compressor when the refrigerant is confined in the outdoor unit.

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

Abstract

La fiabilité d'un compresseur est réduite par la plus grande partie d'un réfrigérant provenant d'un échangeur de chaleur extérieur et acheminé vers l'intérieur du compresseur dans l'état dans lequel réfrigérant est contenu dans une unité extérieure. L'invention concerne un climatiseur (1) comprenant un circuit de réfrigérant dans lequel sont connectés un compresseur (10), une soupape de commutation à quatre voies (11), un échangeur de chaleur extérieur (13) et un échangeur de chaleur intérieur (16). La soupape de commutation à quatre voies (11) peut adopter un premier état dans lequel le côté sortie du compresseur (10) et le côté échangeur de chaleur extérieur (13) sont connectés et le côté entrée du compresseur (10) et le côté échangeur de chaleur intérieur (16) sont connectés, et un second état dans lequel le côté sortie du compresseur (10) et le côté échangeur de chaleur intérieur (16) sont connectés et le côté entrée du compresseur (10) et l'échangeur de chaleur extérieur (13) sont connectés. Le circuit de réfrigérant comprend une soupape (14) actionnée par un moteur et agencée entre l'échangeur de chaleur intérieur (16) et l'échangeur de chaleur extérieur (13), et une électrovanne (12) agencée entre l'échangeur de chaleur extérieur (13) et la soupape de commutation à quatre voies (11).
PCT/JP2014/078936 2013-11-14 2014-10-30 Climatiseur Ceased WO2015072342A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2013236246A JP5794279B2 (ja) 2013-11-14 2013-11-14 空気調和機
JP2013-236246 2013-11-14

Publications (1)

Publication Number Publication Date
WO2015072342A1 true WO2015072342A1 (fr) 2015-05-21

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PCT/JP2014/078936 Ceased WO2015072342A1 (fr) 2013-11-14 2014-10-30 Climatiseur

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JP (1) JP5794279B2 (fr)
WO (1) WO2015072342A1 (fr)

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WO2017119105A1 (fr) * 2016-01-07 2017-07-13 三菱電機株式会社 Dispositif de climatisation
EP3598015A4 (fr) * 2017-04-25 2020-04-01 Samsung Electronics Co., Ltd. Système de climatisation et procédé de commande associé
JP2020051738A (ja) * 2018-09-28 2020-04-02 ダイキン工業株式会社 熱負荷処理システム
JP7806843B1 (ja) 2024-07-30 2026-01-27 株式会社富士通ゼネラル 空気調和装置および熱源ユニット

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EP3318823B1 (fr) * 2015-06-30 2020-10-28 Mitsubishi Electric Corporation Système à cycle de réfrigération
JP6304330B2 (ja) 2016-09-02 2018-04-04 ダイキン工業株式会社 冷凍装置
US11199337B2 (en) 2018-04-09 2021-12-14 Mitsubishi Electric Corporation Air conditioner

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JP2000249385A (ja) * 1999-02-26 2000-09-12 Daikin Ind Ltd 冷凍装置
JP2004183957A (ja) * 2002-12-02 2004-07-02 Tgk Co Ltd 冷凍システムおよびその運転方法
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JPS591963A (ja) * 1982-06-24 1984-01-07 シャープ株式会社 ヒートポンプ式冷凍サイクルの制御方法
JPH07208823A (ja) * 1994-01-20 1995-08-11 Fujitsu General Ltd 多室空気調和機
JPH11118275A (ja) * 1997-10-17 1999-04-30 Daikin Ind Ltd マルチ形空気調和機
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JP2000249385A (ja) * 1999-02-26 2000-09-12 Daikin Ind Ltd 冷凍装置
JP2004183957A (ja) * 2002-12-02 2004-07-02 Tgk Co Ltd 冷凍システムおよびその運転方法
JP2013178075A (ja) * 2012-02-06 2013-09-09 Daikin Industries Ltd 冷凍装置

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017119105A1 (fr) * 2016-01-07 2017-07-13 三菱電機株式会社 Dispositif de climatisation
JPWO2017119105A1 (ja) * 2016-01-07 2018-08-30 三菱電機株式会社 空気調和装置
GB2560455A (en) * 2016-01-07 2018-09-12 Mitsubishi Electric Corp Air-conditioning device
GB2560455B (en) * 2016-01-07 2020-09-23 Mitsubishi Electric Corp Air-conditioning apparatus
EP3598015A4 (fr) * 2017-04-25 2020-04-01 Samsung Electronics Co., Ltd. Système de climatisation et procédé de commande associé
US11371735B2 (en) 2017-04-25 2022-06-28 Samsung Electronics Co., Ltd. Air conditioning system and method of controlling the same
JP2020051738A (ja) * 2018-09-28 2020-04-02 ダイキン工業株式会社 熱負荷処理システム
WO2020067041A1 (fr) * 2018-09-28 2020-04-02 ダイキン工業株式会社 Système de traitement de charge thermique
JP7806843B1 (ja) 2024-07-30 2026-01-27 株式会社富士通ゼネラル 空気調和装置および熱源ユニット

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