WO2020241076A1 - Air-conditioning system - Google Patents

Air-conditioning system Download PDF

Info

Publication number
WO2020241076A1
WO2020241076A1 PCT/JP2020/015853 JP2020015853W WO2020241076A1 WO 2020241076 A1 WO2020241076 A1 WO 2020241076A1 JP 2020015853 W JP2020015853 W JP 2020015853W WO 2020241076 A1 WO2020241076 A1 WO 2020241076A1
Authority
WO
WIPO (PCT)
Prior art keywords
unit
compressor
conditioning system
controller
air conditioning
Prior art date
Application number
PCT/JP2020/015853
Other languages
French (fr)
Japanese (ja)
Inventor
和博 中山
岡本　敦
Original Assignee
ダイキン工業株式会社
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 ダイキン工業株式会社 filed Critical ダイキン工業株式会社
Priority to CN202080038527.7A priority Critical patent/CN113874661B/en
Priority to EP20813372.8A priority patent/EP3978817B1/en
Priority to US17/614,280 priority patent/US20220146173A1/en
Publication of WO2020241076A1 publication Critical patent/WO2020241076A1/en

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • 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
    • F25B49/022—Compressor control arrangements
    • 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
    • F24F11/37—Resuming operation, e.g. after power outages; Emergency starting
    • 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
    • F25B31/00—Compressor arrangements
    • F25B31/002—Lubrication
    • F25B31/004—Lubrication oil recirculating 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
    • 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
    • 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
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
    • F25D21/002—Defroster control
    • 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
    • F24F11/41—Defrosting; Preventing freezing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/30—Condensation of water from cooled air
    • 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
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F25B2600/025—Compressor control by controlling speed
    • F25B2600/0251—Compressor control by controlling speed with on-off operation
    • 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
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2513—Expansion valves
    • 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
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/19—Pressures
    • F25B2700/193—Pressures of the compressor
    • F25B2700/1933—Suction pressures
    • 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
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2115—Temperatures of a compressor or the drive means therefor
    • F25B2700/21151—Temperatures of a compressor or the drive means therefor at the suction side of the compressor

Definitions

  • An air conditioning system that can operate air conditioning even if the power of some indoor units is cut off.
  • Patent Document 1 Japanese Unexamined Patent Publication No. 2013-406978 discloses an air conditioner capable of performing air conditioning operation even when the power supply of some indoor units is cut off.
  • a power supply unit may be installed to supply power to an indoor unit whose power is cut off.
  • a power supply unit can supply. Problems such as damage to the compressor in the outdoor unit or overflow of drain water in the indoor unit may occur.
  • the air conditioning system includes a refrigerant cycle, a power supply unit, a controller, and a judgment unit.
  • the refrigerant cycle includes an outdoor unit and a plurality of indoor units.
  • the outdoor unit includes a compressor.
  • the power supply unit supplies auxiliary power to at least a part of the plurality of indoor units when the power is cut off.
  • the controller at least controls the compressor.
  • the determination unit makes one determination of stopping the compressor and continuing the operation of the compressor when the power supply to at least a part of the plurality of indoor units is cut off.
  • the judgment unit sends a command corresponding to the judgment to the controller.
  • the judgment unit predicts the degree of wetness or the degree of wetness of the refrigerant sucked by the compressor, and the amount of drain water in at least a part of the plurality of indoor units. Or, make a judgment based on at least one of the prediction of the amount of drain water.
  • the judgment unit predicts the amount of drain water or the amount of drain water in at least a part of the plurality of indoor units, and the power supply capacity of the power supply unit. Make a decision.
  • the controller causes at least the compressor to perform an oil return operation or a defrost operation in the refrigerant cycle.
  • the determination unit determines whether to continue the oil return operation or the defrost operation when the power supply unit supplies auxiliary power to at least a part of the power supply unit.
  • the controller determines that the oil return operation is not continued when the controller is executing the oil return operation in the refrigerant cycle in the air conditioning system according to the fourth viewpoint, the controller determines that the oil return operation is not continued. Stop the compressor.
  • the controller stops the compressor based on the degree of wetness of the refrigerant sucked by the compressor.
  • the air conditioning system is the air conditioning system according to the fourth aspect, and each of the plurality of indoor units includes an expansion valve.
  • the controller divides the plurality of indoor units into at least two groups. When the controller determines that the oil return operation is to be continued while the refrigerant cycle is executing the oil return operation, the controller executes the first group closing control and the second group closing control in order. .. In the first group closing control, the expansion valve of the indoor unit belonging to the first group is closed, and the expansion valve of the indoor unit belonging to the second group is opened. In the second group closing control, the expansion valve of the indoor unit belonging to the first group is opened, and the expansion valve of the indoor unit belonging to the second group is closed.
  • the air conditioning system according to the eighth aspect is the air conditioning system according to any one of the fourth aspect to the seventh aspect, and the outdoor unit further includes a four-way switching valve.
  • the controller When the controller is causing the refrigerant cycle to perform the defrost operation, if the determination unit determines that the defrost operation is not continued, the controller stops the compressor.
  • the air conditioning system according to the ninth aspect is the air conditioning system according to the seventh aspect, and the outdoor unit further includes a four-way switching valve.
  • the controller determines that the defrost operation is to be continued while the refrigerant cycle is performing the defrost operation, the controller switches the four-way switching valve.
  • At least one of a plurality of expansion valves is opened when the controller switches the four-way switching valve, and the compressor is operating.
  • FIG. 1 is a schematic configuration diagram of the air conditioning system 100 of the present embodiment.
  • the air conditioning system 100 is a system that realizes air conditioning such as cooling and heating in a target space included in a building such as a house, a building, a factory, or a public facility.
  • the air conditioning system 100 includes a refrigerant circuit RC in which a refrigerant circulates.
  • the air conditioning system 100 cools or heats the target space by circulating the refrigerant in the refrigerant circuit RC and performing a vapor compression refrigeration cycle.
  • a refrigerant such as R410A, R32 or ammonia is sealed in the refrigerant circuit RC.
  • the air conditioning system 100 mainly includes one outdoor unit 10 as a heat source unit, a plurality of indoor units 30 (30a, 30b, 30c) as utilization units (three in FIG. 1), and one power supply unit. It includes 40, a plurality of remote controllers 50 (three in FIG. 1), and a controller 60.
  • the refrigerant circuit RC of the air conditioning system 100 is configured such that the outdoor unit 10 and each indoor unit 30 are connected by a gas communication pipe GP and a liquid communication pipe LP.
  • the air conditioning system 100 is a multi-type (multi-tenant) air-conditioning system in which a plurality of indoor units 30 are connected to the same refrigerant system.
  • Outdoor unit 10 is an outdoor unit installed outdoors (outside the target space).
  • the outdoor unit 10 mainly includes a plurality of refrigerant pipes (first pipe P1 to fifth pipe P5), a compressor 11, a four-way switching valve 12, an outdoor heat exchanger 13, an outdoor fan 15, and an outdoor unit. It has a control unit 17 and a determination unit 90.
  • the first pipe P1 is a refrigerant pipe that connects the gas connecting pipe GP and the four-way switching valve 12.
  • the second pipe P2 is a suction pipe that connects the four-way switching valve 12 and the suction port (not shown) of the compressor 11.
  • the third pipe P3 is a discharge pipe that connects the discharge port (not shown) of the compressor 11 and the four-way switching valve 12.
  • the fourth pipe P4 is a refrigerant pipe that connects the four-way switching valve 12 and the gas side of the outdoor heat exchanger 13.
  • the fifth pipe P5 is a refrigerant pipe that connects the liquid side of the outdoor heat exchanger 13 and the liquid communication pipe LP.
  • the compressor 11 is a mechanism that sucks in a low-pressure gas refrigerant, compresses it, and discharges it.
  • the compressor 11 has a closed structure in which the compressor motor 11a is built.
  • a rotary type or scroll type compression element housed in the compressor casing (not shown) is driven by the compressor motor 11a as a drive source.
  • the compressor motor 11a is controlled by an inverter during operation, and the rotation speed is adjusted according to the situation.
  • the compressor 11 sucks the refrigerant from the suction port, compresses it, and discharges it from the discharge port.
  • the four-way switching valve 12 is a valve for switching the flow direction of the refrigerant in the refrigerant circuit RC.
  • the four-way switching valve 12 is individually connected to the first pipe P1, the second pipe P2, the third pipe P3, and the fourth pipe P4.
  • the four-way switching valve 12 switches the flow path so that the first pipe P1 and the second pipe P2 are connected and the third pipe P3 and the fourth pipe P4 are connected during the cooling operation (FIG. Refer to the solid line of the four-way switching valve 12 in 1).
  • the four-way switching valve 12 switches the flow path so that the first pipe P1 and the third pipe P3 are connected and the second pipe P2 and the fourth pipe P4 are connected during the heating operation (FIG. See the broken line of the four-way switching valve 12 in 1).
  • the outdoor heat exchanger 13 is a heat exchanger that functions as a refrigerant condenser or radiator during cooling operation and as a refrigerant evaporator or endothermic during heating operation.
  • the outdoor heat exchanger 13 includes a heat transfer tube through which the refrigerant flows (not shown) and a heat transfer fin (not shown) that increases the heat transfer area.
  • the outdoor heat exchanger 13 is arranged so that the refrigerant in the heat transfer tube and the air flow generated by the outdoor fan 15 can exchange heat during operation.
  • the outdoor fan 15 is, for example, a propeller fan.
  • the outdoor fan 15 is connected to the output shaft of the outdoor fan motor 15a and is driven in conjunction with the outdoor fan motor 15a. When the outdoor fan 15 is driven, it generates an air flow that flows into the outdoor unit 10 from the outside, passes through the outdoor heat exchanger 13, and then flows out to the outside of the outdoor unit 10.
  • the outdoor unit control unit 17 is a microcomputer composed of a CPU, a memory, and the like.
  • the outdoor unit control unit 17 controls the operation of each actuator of the outdoor unit 10.
  • the outdoor unit control unit 17 is connected to the indoor unit control unit 34 (described later) of each indoor unit 30 via communication lines cb1 and cb2 and a power supply unit 40, and transmits and receives signals to and from each other.
  • the determination unit 90 is a microcomputer composed of a CPU, a memory, and the like.
  • the determination unit 90 can communicate with the outdoor unit control unit 17.
  • the determination unit 90 determines whether to continue the oil return operation or the defrost operation when the power supply unit 40 operates. The operation of the determination unit 90 will be described later.
  • the indoor unit 30 (30a, 30b, 30c) is an indoor unit installed in the target space.
  • the indoor unit 30 and the outdoor unit 10 form a refrigerant circuit RC.
  • the indoor unit 30 mainly includes an indoor heat exchanger 31, expansion valves 32 (32a, 32b, 32c), an indoor fan 33, and an indoor unit control unit 34.
  • the indoor heat exchanger 31 is a heat exchanger that functions as a refrigerant evaporator or endothermic during cooling operation and as a refrigerant condenser or radiator during heating operation.
  • the indoor heat exchanger 31 is, for example, a cross fin tube heat exchanger.
  • the liquid side of the indoor heat exchanger 31 is connected to a refrigerant pipe extending to the expansion valves 32 (32a, 32b, 32c).
  • the gas side of the indoor heat exchanger 31 is connected to a refrigerant pipe extending to the gas connecting pipe GP.
  • the indoor heat exchanger 31 is arranged so that the refrigerant in the heat transfer tube (not shown) and the air flow generated by the indoor fan 33 can exchange heat during operation.
  • the expansion valve 32 (32a, 32b, 32c) is an electric valve whose opening degree can be adjusted.
  • the opening degree of the expansion valve 32 is appropriately adjusted according to the situation during operation, and the refrigerant is depressurized according to the opening degree.
  • Each chamber unit 30 has one expansion valve 32.
  • the indoor unit 30a has an expansion valve 32a
  • the indoor unit 30b has an expansion valve 32b
  • the indoor unit 30c has an expansion valve 32c.
  • the opening degrees of the expansion valves 32a, 32b, 32c are appropriately adjusted according to the operating conditions of the corresponding indoor units 30a, 30b, 30c, respectively.
  • the expansion valve 32 is connected to a refrigerant pipe extending to the liquid side of the indoor heat exchanger 31 and a refrigerant pipe extending to the liquid communication pipe LP.
  • the liquid communication pipe LP connects the fifth pipe P5 of the outdoor unit 10 and each expansion valve 32.
  • One end of the liquid communication pipe LP is connected to the fifth pipe P5, and the other end of the liquid communication pipe LP is branched according to the number of expansion valves 32 and is individually connected to each expansion valve 32.
  • the indoor fan 33 is, for example, a blower such as a turbo fan, a sirocco fan, a cross flow fan, or a propeller fan.
  • the indoor fan 33 is connected to the output shaft of the indoor fan motor 33a.
  • the indoor fan 33 is driven in conjunction with the indoor fan motor 33a. When the indoor fan 33 is driven, it generates an air flow that is sucked into the indoor unit 30, passes through the indoor heat exchanger 31, and then blown out to the target space.
  • the indoor unit control unit 34 is a microcomputer composed of a CPU, a memory, and the like.
  • the indoor unit control unit 34 controls the operation of each actuator of the indoor unit 30.
  • Each indoor unit control unit 34 is connected to the outdoor unit control unit 17 via communication lines cb1 and cb2 and a power supply unit 40, and transmits and receives signals to and from each other.
  • the indoor unit control unit 34 wirelessly communicates with the remote controller 50.
  • the indoor unit control unit 34 of the indoor unit 30 is connected to the expansion valve 32 of the indoor unit 30 via a communication line (not shown), and the opening degree of the expansion valve 32 can be adjusted.
  • the power supply unit 40 is connected to the outdoor unit control unit 17 and each indoor unit control unit 34 via communication lines cb1 and cb2.
  • the communication line cb1 connects the power supply unit 40 and the outdoor unit control unit 17, and the communication line cb2 branches according to the number of the indoor unit control units 34, and the power supply unit 40 and each indoor unit. It is connected to the unit control unit 34.
  • the communication line cb1 is connected to the communication line cb2 via the power supply unit 40.
  • Each indoor unit 30 is connected to an external commercial power source (not shown) installed in the building.
  • the indoor unit 30 is operated by electric power supplied from a commercial power source during normal operation.
  • the power supply unit 40 receives a commercial power supply (in other words, when the power supply from the commercial power supply to at least one indoor unit 30 is stopped when the commercial power supply to at least a part of the plurality of indoor units 30 is cut off.
  • power supply is an auxiliary power source for supplying power to the indoor unit 30 in which the power is cut off.
  • the communication line cb2 transmits the electric power supplied from the power supply unit 40 to each indoor unit 30 in addition to the signals transmitted and received between the outdoor unit control unit 17 and each indoor unit control unit 34.
  • the remote controller 50 has a remote controller control unit (not shown) including a microcomputer composed of a CPU, a memory, and the like, and a remote controller input unit (not shown) including input keys for inputting various commands to the air conditioning system 100. It is a device.
  • the air conditioning system 100 has the same number of remote controllers 50 as the indoor unit 30.
  • the remote controller 50 is one-to-one associated with any of the indoor units 30.
  • the remote controller 50 performs wireless communication with the indoor unit control unit 34 of the corresponding indoor unit 30 by using infrared rays, radio waves, and the like.
  • the remote controller 50 transmits a predetermined signal to the indoor unit control unit 34 in response to the input command.
  • Controller 60 In the air conditioning system 100, the outdoor unit control unit 17 of the outdoor unit 10 and the indoor unit control unit 34 of each indoor unit 30 (30a, 30b, 30c) are connected via communication lines cb1, cb2 and a power supply unit 40. As a result, the controller 60 is configured. The controller 60 controls the operation of the air conditioning system 100.
  • the refrigerant flowing into the outdoor heat exchanger 13 exchanges heat with the air flow generated by the outdoor fan 15 and condenses (or dissipates heat).
  • the refrigerant flowing out of the outdoor heat exchanger 13 passes through the fifth pipe P5 and the liquid communication pipe LP and flows into each indoor unit 30.
  • the refrigerant that has flowed into the indoor unit 30 flows into the expansion valve 32.
  • the refrigerant that has flowed into the expansion valve 32 is depressurized according to the opening degree of the expansion valve 32.
  • the refrigerant flowing out of the expansion valve 32 flows into the indoor heat exchanger 31 and exchanges heat with the air flow generated by the indoor fan 33 to evaporate (or absorb heat).
  • the refrigerant flowing out of the indoor heat exchanger 31 passes through the gas connecting pipe GP and flows into the outdoor unit 10.
  • the refrigerant that has flowed into the outdoor unit 10 passes through the first pipe P1, the four-way switching valve 12, and the second pipe P2, and is sucked into the compressor 11 again to be compressed.
  • the four-way switching valve 12 is switched to the heating cycle state (the state shown by the broken line of the four-way switching valve 12 in FIG. 1).
  • the refrigerant is sucked into the compressor 11 via the second pipe P2 and compressed.
  • the refrigerant discharged from the compressor 11 passes through the third pipe P3, the four-way switching valve 12, the first pipe P1 and the gas connecting pipe GP, and flows into each indoor unit 30.
  • the refrigerant that has flowed into the indoor unit 30 flows into the indoor heat exchanger 31 and exchanges heat with the air flow generated by the indoor fan 33 to condense (or dissipate heat).
  • the refrigerant flowing out of the indoor heat exchanger 31 flows into the expansion valve 32 and is depressurized according to the opening degree of the expansion valve 32.
  • the refrigerant flowing out of the expansion valve 32 passes through the liquid communication pipe LP and flows into the outdoor unit 10.
  • the refrigerant that has flowed into the outdoor unit 10 passes through the fifth pipe P5 and flows into the outdoor heat exchanger 13.
  • the refrigerant flowing into the outdoor heat exchanger 13 exchanges heat with the air flow generated by the outdoor fan 15 and evaporates (or absorbs heat).
  • the refrigerant flowing out of the outdoor heat exchanger 13 passes through the fourth pipe P4, the four-way switching valve 12, and the second pipe P2, and is sucked into the compressor 11 again to be compressed.
  • (2-4) Defrost operation melts the frost generated in the outdoor heat exchanger 13 due to the heating operation.
  • the four-way switching valve 12 is switched to the cooling cycle state.
  • the indoor fan 33 is stopped.
  • FIG. 2 shows a control flow of operation of the entire air conditioning system 100. As shown in FIG. 2, the entire air conditioning system 100 operates in a normal control mode or a multi-tenant control mode (hereinafter, referred to as “M / T control mode”).
  • M / T control mode a multi-tenant control mode
  • the normal operation control which is also used in the conventional system consisting of one outdoor unit and one indoor unit, is performed.
  • the power supplies of all the indoor units 30 of the air conditioning system 100 are not cut off, and power is supplied from an external power source.
  • the air conditioning system 100 starts the air conditioning operation by operating the remote controller 50 or the like, shifts from a stopped state to a steady state (a state in which operation control is performed in the normal state), or stops the air conditioning operation. Then, it shifts from the steady state to the stopped state. When shifting from the steady state to the stopped state, an oil return operation and a defrost operation are performed as necessary.
  • the air conditioning system 100 operating in the normal control mode shifts to the M / T control mode when at least a part of the power supply of the indoor unit 30 is cut off (see the solid line arrow in FIG. 2).
  • the M / T control mode the power of at least one indoor unit 30 is cut off and the operation is stopped.
  • the indoor unit 30 whose power is cut off hereinafter referred to as “power cutoff indoor unit 30” receives auxiliary power from the power supply unit 40.
  • FIG. 3 is a flowchart of the M / T control mode when the power cutoff chamber unit 30 occurs during the oil return operation.
  • the determination unit 90 determines whether or not to continue the oil return operation based on the number of power cutoff chamber units 30, the remaining time required for the oil return operation, the power that can be supplied by the power supply unit, and the like (S101).
  • the controller 60 continues the oil return operation (S102).
  • the controller 60 acquires the degree of wetness of the refrigerant sucked by the compressor 11 (S103).
  • the controller 60 determines whether or not to stop the compressor 11 based on the degree of wetness of the acquired refrigerant (S104). If it is determined that the controller 60 does not stop the compressor 11 (S104: NO), the controller 60 returns to step S103. On the other hand, when the controller 60 determines to stop the compressor 11 (S104: YES), the controller stops the compressor 11.
  • FIG. 4 is a flowchart when the power cutoff chamber unit 30 occurs during the defrost operation.
  • the determination unit 90 determines whether or not to continue the defrost based on the number of the power cutoff chamber units 30, the remaining time required for the defrost operation, the power that can be supplied by the power supply unit, and the like (S201).
  • the controller 60 continues the defrost operation (S202). On the other hand, when the determination unit 90 determines that the defrost operation is not continued (S201: NO), the controller 60 stops the compressor 11.
  • the defrost operation similar to the normal control mode is performed. For example, during the heating operation, the expansion valve 32 is first closed, and then the four-way switching valve 12 is switched to the cooling cycle state. The expansion valve 32 is then opened. By doing so, it is possible to suppress a situation in which the user hears the noise caused by the switching of the four-way switching valve.
  • the determination unit 90 determines whether to continue the oil return operation or the defrost operation. Therefore, even if the power cutoff indoor unit 30 occurs during the oil return operation or the defrost operation, if it is considered that the air conditioning system 100 is not damaged, the oil return operation or the defrost operation should be continued. Can be done.
  • the controller 60 stops the compressor 11 based on the degree of wetness of the refrigerant sucked by the compressor 11. Therefore, it is possible to suppress the compressor 11 from sucking a large amount of liquid refrigerant and reduce the damage to the compressor 11.
  • the indoor unit 30 when the oil return operation is continued when the power cutoff indoor unit 30 is generated, the oil return operation is performed for all the indoor units 30 (30a to 30c) at the same time.
  • the indoor unit 30 may be divided into a plurality of groups, and the oil return operation may be sequentially executed for each group.
  • the indoor unit 30 is divided into a first group G1 (30a, 30b) and a second group (30c).
  • the controller 60 executes the first group closure control (S102-1).
  • the expansion valve 32 (32a, 32b) of the indoor unit 30 (30a, 30b) belonging to the first group G1 is closed, and the expansion valve of the indoor unit 30 (30c) belonging to the second group G2 is closed.
  • 32 (32c) can be opened. In this state, the oil return operation is executed.
  • the controller 60 executes the second group closure control (S102-2).
  • the second group closing control the expansion valve 32 (32a, 32b) of the indoor unit 30 (30a, 30b) belonging to the first group G1 is opened, and the expansion valve of the indoor unit 30 (30c) belonging to the second group G2 is opened. 32 (32c) is closed. In this state, the oil return operation is executed.
  • the controller 60 keeps the expansion valve of the indoor unit 30 open and the four-way switching valve. 12 is switched to the cooling cycle state (S202-1).
  • the operation of closing the expansion valve is omitted for noise processing, so that the power supplied by the power supply unit 40 to the expansion valve 32 can be reduced.
  • FIG. 8 is a schematic configuration diagram of the air conditioning system 100 in this modified example.
  • the outdoor unit 10 further includes an oil separator 14, an expansion valve 16, a receiver 18, and an accumulator 19.
  • the oil separator 14 is attached to the third pipe P3.
  • the oil separator 14 removes the lubricating oil mixed in the refrigerant from the high-pressure gas refrigerant discharged from the compressor 11.
  • the expansion valve 16 is attached to the fifth pipe P5.
  • the expansion valve 16 is an electric valve whose opening degree can be adjusted.
  • the opening degree of the expansion valve 16 is appropriately adjusted according to the situation during the operation of the air conditioning system 100, and the refrigerant is depressurized according to the opening degree.
  • the receiver 18 is attached to the fifth pipe P5.
  • the receiver 18 is attached between the expansion valve 16 and the liquid communication pipe LP.
  • the receiver 18 temporarily stores the refrigerant in order to absorb the change in the amount of the refrigerant in the outdoor heat exchanger 13 and the indoor heat exchanger 31 according to the operating condition of the air conditioning system 100.
  • the receiver 18 may have a mechanism for removing water and foreign matter contained in the refrigerant circulating in the refrigerant circuit RC.
  • the accumulator 19 is attached to the second pipe P2.
  • the accumulator 19 separates the gas-liquid mixed refrigerant flowing through the refrigerant circuit RC into a gas refrigerant and a liquid refrigerant, and sends only the gas refrigerant to the suction port of the compressor 11.
  • the outdoor unit 10 does not have to have the receiver 18 or the accumulator 19.
  • FIG. 9 shows the operation of the air conditioning system 100 according to the modified example D.
  • the M / T control mode starts when the power cutoff indoor unit 30 occurs during any operation (S300).
  • the controller 60 acquires the degree of wetness of the refrigerant sucked by the compressor 11 (S301).
  • the determination unit 90 determines whether or not the degree of wetness of the acquired refrigerant or the future prediction of the degree of wetness based on the degree of wetness is abnormal (S302). If it is abnormal (S302: YES), the determination unit 90 sends a command to the controller 60 to stop the compressor 11 (S305). This is to prevent damage to the compressor 11.
  • the controller 60 acquires information on the opening degree of the expansion valve of the power cutoff chamber unit 30 (S303).
  • the determination unit 90 derives the drain water amount in the power cutoff chamber unit 30 or the future prediction of the drain water amount from the acquired opening degree information.
  • the determination unit 90 determines whether or not there is a possibility that the drain water will overflow in the power cutoff chamber unit 30 based on the derived value (S304).
  • the determination unit 90 sends a command to the controller 60 to stop the compressor 11 (S305). This is to prevent the drain water from overflowing in the power cutoff chamber unit 30.
  • the process proceeds to step S100 or step S200 in the embodiment or modification described so far.

Landscapes

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

Abstract

An air-conditioning system (100) comprises a refrigeration cycle (RC), a power feeding unit (40), a controller (60), and a determination unit (90). The refrigeration cycle (RC) includes an outdoor unit (10) and a plurality of indoor units (30). The outdoor unit (10) includes a compressor (11). When power to at least one of the plurality of indoor units (30) is cut off, the power feeding unit (40) supplies auxiliary power to the at least one indoor unit. The controller (60) controls at least the compressor (11). The determination unit (90) makes a determination to stop the compressor (11) or to allow the compressor (11) to continue operating when power to at least one of the plurality of indoor units (10) is cut off. The determination unit (90) sends a command corresponding to the determination to the controller (60).

Description

空調システムAir conditioning system
　一部の室内機の電源が遮断されても空調運転をすることができる空調システム。 An air conditioning system that can operate air conditioning even if the power of some indoor units is cut off.
　特許文献１（特開２０１３－４０６９８号公報）には、一部の室内機の電源が遮断されても空調運転をすることができる空気調和機が開示されている。 Patent Document 1 (Japanese Unexamined Patent Publication No. 2013-40698) discloses an air conditioner capable of performing air conditioning operation even when the power supply of some indoor units is cut off.
　空調システムにおいて、電源が遮断された室内機に対して電源を供給するために、給電ユニットが設置されることがある。しかし、そのような給電ユニットが供給できる電力には制限がある。室外ユニットにおける圧縮機の破損、又は、室内ユニットにおけるドレン水のあふれなどの問題が発生するおそれがある。 In an air conditioning system, a power supply unit may be installed to supply power to an indoor unit whose power is cut off. However, there is a limit to the power that such a power supply unit can supply. Problems such as damage to the compressor in the outdoor unit or overflow of drain water in the indoor unit may occur.
　第１観点に係る空調システムは、冷媒サイクルと、給電ユニットと、コントローラと、判断部と、を備える。冷媒サイクルは、室外ユニット、及び複数の室内ユニットを含む。室外ユニットは、圧縮機を含む。給電ユニットは、複数の室内ユニットの少なくとも一部への電源が遮断される場合に、少なくとも一部へ補助電源の供給を行う。コントローラは、少なくとも圧縮機を制御する。判断部は、複数の室内ユニットの少なくとも一部への電源が遮断される場合に、圧縮機を停止させる、及び、圧縮機に運転を継続させる、の一方の判断を行う。判断部は、判断に対応する指令をコントローラに送る。 The air conditioning system according to the first aspect includes a refrigerant cycle, a power supply unit, a controller, and a judgment unit. The refrigerant cycle includes an outdoor unit and a plurality of indoor units. The outdoor unit includes a compressor. The power supply unit supplies auxiliary power to at least a part of the plurality of indoor units when the power is cut off. The controller at least controls the compressor. The determination unit makes one determination of stopping the compressor and continuing the operation of the compressor when the power supply to at least a part of the plurality of indoor units is cut off. The judgment unit sends a command corresponding to the judgment to the controller.
　第２観点に係る空調システムは、第１観点に係る空調システムにおいて、判断部が、圧縮機が吸入する冷媒の湿り度合又は湿り度合いの予測、及び、複数の室内ユニットの少なくとも一部におけるドレン水量又はドレン水量の予測、の少なくとも一方に基づいて判断を行う。 In the air conditioning system according to the second aspect, in the air conditioning system according to the first aspect, the judgment unit predicts the degree of wetness or the degree of wetness of the refrigerant sucked by the compressor, and the amount of drain water in at least a part of the plurality of indoor units. Or, make a judgment based on at least one of the prediction of the amount of drain water.
　第３観点に係る空調システムは、第２観点に係る空調システムにおいて、判断部が、複数の室内ユニットの少なくとも一部におけるドレン水量又はドレン水量の予測、及び、給電ユニットの給電容量、に基づいて判断を行う。 In the air conditioning system according to the third aspect, in the air conditioning system according to the second aspect, the judgment unit predicts the amount of drain water or the amount of drain water in at least a part of the plurality of indoor units, and the power supply capacity of the power supply unit. Make a decision.
　第４観点に係る空調システムは、第１観点から第３観点のいずれか１つに係る空調システムにおいて、コントローラが、少なくとも圧縮機に、冷媒サイクルにおける油戻し運転又はデフロスト運転を実行させる。判断部は、給電ユニットが少なくとも一部に補助電源を供給する場合において、油戻し運転又はデフロスト運転を継続するか否かを判断する、
請求項１から３のいずれか１項に記載の空調システム。 In the air conditioning system according to the fourth aspect, in the air conditioning system according to any one of the first to third aspects, the controller causes at least the compressor to perform an oil return operation or a defrost operation in the refrigerant cycle. The determination unit determines whether to continue the oil return operation or the defrost operation when the power supply unit supplies auxiliary power to at least a part of the power supply unit.
The air conditioning system according to any one of claims 1 to 3.
　第５観点に係る空調システムは、第４観点に係る空調システムにおいて、コントローラが冷媒サイクルに油戻し運転を実行させている際に、判断部が油戻し運転を継続しないと判断する場合、コントローラは圧縮機を停止させる。 In the air conditioning system according to the fifth aspect, when the controller determines that the oil return operation is not continued when the controller is executing the oil return operation in the refrigerant cycle in the air conditioning system according to the fourth viewpoint, the controller determines that the oil return operation is not continued. Stop the compressor.
　第６観点に係る空調システムは、第５観点に係る空調システムにおいて、コントローラは、圧縮機が吸入する冷媒の湿り度合に基づいて、圧縮機を停止させる。 In the air conditioning system according to the sixth aspect, in the air conditioning system according to the fifth aspect, the controller stops the compressor based on the degree of wetness of the refrigerant sucked by the compressor.
　第７観点に係る空調システムは、第４観点に係る空調システムにおいて、複数の室内ユニットの各々は膨張弁を含む。コントローラは、複数の室内ユニットを少なくとも２つのグループに分ける。コントローラが冷媒サイクルに油戻し運転を実行させている際に、判断部が油戻し運転を継続すると判断する場合、コントローラは、第１グループ閉鎖制御と、第２グループ閉鎖制御と、を順に実行する。第１グループ閉鎖制御では、第１グループに属する室内ユニットの膨張弁を閉じ、かつ、第２グループに属する室内ユニットの膨張弁を開ける。第２グループ閉鎖制御では、第１グループに属する室内ユニットの膨張弁を開け、かつ、第２グループに属する室内ユニットの膨張弁を閉じる。 The air conditioning system according to the seventh aspect is the air conditioning system according to the fourth aspect, and each of the plurality of indoor units includes an expansion valve. The controller divides the plurality of indoor units into at least two groups. When the controller determines that the oil return operation is to be continued while the refrigerant cycle is executing the oil return operation, the controller executes the first group closing control and the second group closing control in order. .. In the first group closing control, the expansion valve of the indoor unit belonging to the first group is closed, and the expansion valve of the indoor unit belonging to the second group is opened. In the second group closing control, the expansion valve of the indoor unit belonging to the first group is opened, and the expansion valve of the indoor unit belonging to the second group is closed.
　第８観点に係る空調システムは、第４観点から第７観点のいずれか１つに記載の空調システムにおいて、室外ユニットは、四路切換弁をさらに含む。コントローラが冷媒サイクルにデフロスト運転を実行させている際に、判断部がデフロスト運転を継続しないと判断する場合、コントローラは圧縮機を停止させる。 The air conditioning system according to the eighth aspect is the air conditioning system according to any one of the fourth aspect to the seventh aspect, and the outdoor unit further includes a four-way switching valve. When the controller is causing the refrigerant cycle to perform the defrost operation, if the determination unit determines that the defrost operation is not continued, the controller stops the compressor.
　第９観点に係る空調システムは、第７観点に係る空調システムにおいて、室外ユニットは、四路切換弁をさらに含む。コントローラが冷媒サイクルにデフロスト運転を実行させている際に、判断部がデフロスト運転を継続すると判断する場合、コントローラは四路切換弁を切り替える。 The air conditioning system according to the ninth aspect is the air conditioning system according to the seventh aspect, and the outdoor unit further includes a four-way switching valve. When the controller determines that the defrost operation is to be continued while the refrigerant cycle is performing the defrost operation, the controller switches the four-way switching valve.
　第１０観点に係る空調システムは、第９観点に係る空調システムにおいて、コントローラが四路切換弁を切り替える際、複数の膨張弁の少なくとも１つが開かれており、圧縮機は運転している。 In the air conditioning system according to the tenth viewpoint, in the air conditioning system according to the ninth viewpoint, at least one of a plurality of expansion valves is opened when the controller switches the four-way switching valve, and the compressor is operating.
一実施形態に係る空調システム１００の概略構成図である。It is a schematic block diagram of the air conditioning system 100 which concerns on one Embodiment. 空調システム１００全体の運転の制御フローを表す図である。It is a figure which shows the control flow of the operation of the whole air conditioning system 100. 油戻し運転中のＭ／Ｔ制御のフローチャートである。It is a flowchart of M / T control during oil return operation. デフロスト運転中のＭ／Ｔ制御のフローチャートである。It is a flowchart of M / T control during defrost operation. 変形例Ａに係る空調システム１００の概略構成図である。It is a schematic block diagram of the air conditioning system 100 which concerns on modification A. 変形例Ａにおける油戻し運転中のＭ／Ｔ制御のフローチャートである。It is a flowchart of M / T control during the oil return operation in the modification A. 変形例Ｂにおけるデフロスト運転中のＭ／Ｔ制御のフローチャートである。It is a flowchart of M / T control during defrost operation in the modification B. 変形例Ｃに係る空調システム１００の概略構成図である。It is a schematic block diagram of the air conditioning system 100 which concerns on modification C. 変形例Ｄにおける空調システム１００の運転中のＭ／Ｔ制御のフローチャートである。It is a flowchart of M / T control during operation of the air conditioning system 100 in the modification D.
　（１）空調システム１００の構成
　図１は、本実施形態の空調システム１００の概略構成図である。空調システム１００は、家屋、ビル、工場又は公共施設等の建物内に含まれる対象空間において冷房及び暖房等の空気調和を実現するシステムである。 (1) Configuration of Air Conditioning System 100 FIG. 1 is a schematic configuration diagram of the air conditioning system 100 of the present embodiment. The air conditioning system 100 is a system that realizes air conditioning such as cooling and heating in a target space included in a building such as a house, a building, a factory, or a public facility.
　空調システム１００は、冷媒が循環する冷媒回路ＲＣを含む。空調システム１００は、冷媒回路ＲＣにおいて冷媒を循環させて蒸気圧縮方式の冷凍サイクルを行うことにより、対象空間の冷房又は暖房を行う。冷媒回路ＲＣには、Ｒ４１０Ａ、Ｒ３２又はアンモニア等の冷媒が封入されている。 The air conditioning system 100 includes a refrigerant circuit RC in which a refrigerant circulates. The air conditioning system 100 cools or heats the target space by circulating the refrigerant in the refrigerant circuit RC and performing a vapor compression refrigeration cycle. A refrigerant such as R410A, R32 or ammonia is sealed in the refrigerant circuit RC.
　空調システム１００は、主として、熱源ユニットとしての１台の室外ユニット１０と、利用ユニットとしての複数台（図１では３台）の室内ユニット３０（３０ａ，３０ｂ，３０ｃ）と、１台の給電ユニット４０と、複数台（図１では３台）のリモコン５０と、コントローラ６０とを備えている。空調システム１００の冷媒回路ＲＣは、室外ユニット１０と各室内ユニット３０とがガス連絡配管ＧＰ及び液連絡配管ＬＰによって接続されることで構成されている。言い換えると、空調システム１００は、同一冷媒系統に複数の室内ユニット３０が接続された、マルチタイプ（マルチテナント）の空調システムである。 The air conditioning system 100 mainly includes one outdoor unit 10 as a heat source unit, a plurality of indoor units 30 (30a, 30b, 30c) as utilization units (three in FIG. 1), and one power supply unit. It includes 40, a plurality of remote controllers 50 (three in FIG. 1), and a controller 60. The refrigerant circuit RC of the air conditioning system 100 is configured such that the outdoor unit 10 and each indoor unit 30 are connected by a gas communication pipe GP and a liquid communication pipe LP. In other words, the air conditioning system 100 is a multi-type (multi-tenant) air-conditioning system in which a plurality of indoor units 30 are connected to the same refrigerant system.
　（１－１）室外ユニット１０
　室外ユニット１０は、室外（対象空間外）に設置される室外機である。室外ユニット１０は、主として、複数の冷媒配管（第１配管Ｐ１～第５配管Ｐ５）と、圧縮機１１と、四路切換弁１２と、室外熱交換器１３と、室外ファン１５と、室外ユニット制御部１７と、判断部９０と、を有している。 (1-1) Outdoor unit 10
The outdoor unit 10 is an outdoor unit installed outdoors (outside the target space). The outdoor unit 10 mainly includes a plurality of refrigerant pipes (first pipe P1 to fifth pipe P5), a compressor 11, a four-way switching valve 12, an outdoor heat exchanger 13, an outdoor fan 15, and an outdoor unit. It has a control unit 17 and a determination unit 90.
　第１配管Ｐ１は、ガス連絡配管ＧＰと四路切換弁１２とを接続する冷媒配管である。第２配管Ｐ２は、四路切換弁１２と圧縮機１１の吸入ポート（図示省略）とを接続する吸入配管である。第３配管Ｐ３は、圧縮機１１の吐出ポート（図示省略）と四路切換弁１２とを接続する吐出配管である。第４配管Ｐ４は、四路切換弁１２と室外熱交換器１３のガス側とを接続する冷媒配管である。第５配管Ｐ５は、室外熱交換器１３の液側と液連絡配管ＬＰとを接続する冷媒配管である。 The first pipe P1 is a refrigerant pipe that connects the gas connecting pipe GP and the four-way switching valve 12. The second pipe P2 is a suction pipe that connects the four-way switching valve 12 and the suction port (not shown) of the compressor 11. The third pipe P3 is a discharge pipe that connects the discharge port (not shown) of the compressor 11 and the four-way switching valve 12. The fourth pipe P4 is a refrigerant pipe that connects the four-way switching valve 12 and the gas side of the outdoor heat exchanger 13. The fifth pipe P5 is a refrigerant pipe that connects the liquid side of the outdoor heat exchanger 13 and the liquid communication pipe LP.
　圧縮機１１は、低圧のガス冷媒を吸入し、圧縮して吐出する機構である。圧縮機１１は、圧縮機モータ１１ａが内蔵された密閉式の構造を有している。圧縮機１１では、圧縮機ケーシング（図示省略）内に収容されたロータリ式又はスクロール式等の圧縮要素（図示省略）が、圧縮機モータ１１ａを駆動源として駆動される。圧縮機モータ１１ａは、運転中、インバータ制御され、状況に応じて回転数が調整される。圧縮機１１は、駆動時に、吸入ポートから冷媒を吸入し、圧縮し、吐出ポートから吐出する。 The compressor 11 is a mechanism that sucks in a low-pressure gas refrigerant, compresses it, and discharges it. The compressor 11 has a closed structure in which the compressor motor 11a is built. In the compressor 11, a rotary type or scroll type compression element (not shown) housed in the compressor casing (not shown) is driven by the compressor motor 11a as a drive source. The compressor motor 11a is controlled by an inverter during operation, and the rotation speed is adjusted according to the situation. At the time of driving, the compressor 11 sucks the refrigerant from the suction port, compresses it, and discharges it from the discharge port.
　四路切換弁１２は、冷媒回路ＲＣにおいて冷媒の流れる方向を切り換えるための弁である。四路切換弁１２は、第１配管Ｐ１、第２配管Ｐ２、第３配管Ｐ３及び第４配管Ｐ４と個別に接続されている。四路切換弁１２は、冷房運転時には、第１配管Ｐ１と第２配管Ｐ２とが接続されるとともに、第３配管Ｐ３と第４配管Ｐ４とが接続されるように、流路を切り換える（図１の四路切換弁１２の実線を参照）。四路切換弁１２は、暖房運転時には、第１配管Ｐ１と第３配管Ｐ３とが接続されるとともに、第２配管Ｐ２と第４配管Ｐ４とが接続されるように、流路を切り換える（図１の四路切換弁１２の破線を参照）。 The four-way switching valve 12 is a valve for switching the flow direction of the refrigerant in the refrigerant circuit RC. The four-way switching valve 12 is individually connected to the first pipe P1, the second pipe P2, the third pipe P3, and the fourth pipe P4. The four-way switching valve 12 switches the flow path so that the first pipe P1 and the second pipe P2 are connected and the third pipe P3 and the fourth pipe P4 are connected during the cooling operation (FIG. Refer to the solid line of the four-way switching valve 12 in 1). The four-way switching valve 12 switches the flow path so that the first pipe P1 and the third pipe P3 are connected and the second pipe P2 and the fourth pipe P4 are connected during the heating operation (FIG. See the broken line of the four-way switching valve 12 in 1).
　室外熱交換器１３は、冷房運転時には冷媒の凝縮器又は放熱器として機能し、暖房運転時には冷媒の蒸発器又は吸熱器として機能する熱交換器である。室外熱交換器１３は、冷媒が流れる伝熱管（図示省略）と、伝熱面積を増大する伝熱フィン（図示省略）とを含む。室外熱交換器１３は、運転時において、伝熱管内の冷媒と、室外ファン１５によって生成される空気流とが熱交換可能なように配置されている。 The outdoor heat exchanger 13 is a heat exchanger that functions as a refrigerant condenser or radiator during cooling operation and as a refrigerant evaporator or endothermic during heating operation. The outdoor heat exchanger 13 includes a heat transfer tube through which the refrigerant flows (not shown) and a heat transfer fin (not shown) that increases the heat transfer area. The outdoor heat exchanger 13 is arranged so that the refrigerant in the heat transfer tube and the air flow generated by the outdoor fan 15 can exchange heat during operation.
　室外ファン１５は、例えばプロペラファンである。室外ファン１５は、室外ファンモータ１５ａの出力軸に接続されており、室外ファンモータ１５ａに連動して駆動する。室外ファン１５は、駆動すると、外部から室外ユニット１０内に流入し室外熱交換器１３を通過してから室外ユニット１０外へ流出する空気流を生成する。 The outdoor fan 15 is, for example, a propeller fan. The outdoor fan 15 is connected to the output shaft of the outdoor fan motor 15a and is driven in conjunction with the outdoor fan motor 15a. When the outdoor fan 15 is driven, it generates an air flow that flows into the outdoor unit 10 from the outside, passes through the outdoor heat exchanger 13, and then flows out to the outside of the outdoor unit 10.
　室外ユニット制御部１７は、ＣＰＵ及びメモリ等から構成されるマイクロコンピュータである。室外ユニット制御部１７は、室外ユニット１０の各アクチュエータの動作を制御する。室外ユニット制御部１７は、各室内ユニット３０の室内ユニット制御部３４（後述）と、通信線ｃｂ１，ｃｂ２及び給電ユニット４０を介して接続されており、相互に信号の送受信を行う。 The outdoor unit control unit 17 is a microcomputer composed of a CPU, a memory, and the like. The outdoor unit control unit 17 controls the operation of each actuator of the outdoor unit 10. The outdoor unit control unit 17 is connected to the indoor unit control unit 34 (described later) of each indoor unit 30 via communication lines cb1 and cb2 and a power supply unit 40, and transmits and receives signals to and from each other.
　判断部９０は、ＣＰＵ及びメモリ等から構成されるマイクロコンピュータである。判断部９０は、室外ユニット制御部１７と通信可能である。判断部９０は、給電ユニット４０が作動する場合において、油戻し運転又はデフロスト運転を継続するか否かを判断する。判断部９０の動作については後述する。 The determination unit 90 is a microcomputer composed of a CPU, a memory, and the like. The determination unit 90 can communicate with the outdoor unit control unit 17. The determination unit 90 determines whether to continue the oil return operation or the defrost operation when the power supply unit 40 operates. The operation of the determination unit 90 will be described later.
　（１－２）室内ユニット３０
　室内ユニット３０（３０ａ，３０ｂ，３０ｃ）は、対象空間に設置される室内機である。室内ユニット３０は、室外ユニット１０とともに冷媒回路ＲＣを構成している。室内ユニット３０は、主として、室内熱交換器３１と、膨張弁３２（３２ａ，３２ｂ，３２ｃ）と、室内ファン３３と、室内ユニット制御部３４とを有している。 (1-2) Indoor unit 30
The indoor unit 30 (30a, 30b, 30c) is an indoor unit installed in the target space. The indoor unit 30 and the outdoor unit 10 form a refrigerant circuit RC. The indoor unit 30 mainly includes an indoor heat exchanger 31, expansion valves 32 (32a, 32b, 32c), an indoor fan 33, and an indoor unit control unit 34.
　室内熱交換器３１は、冷房運転時には冷媒の蒸発器又は吸熱器として機能し、暖房運転時には冷媒の凝縮器又は放熱器として機能する熱交換器である。室内熱交換器３１は、例えばクロスフィンチューブ熱交換器である。室内熱交換器３１の液側は、膨張弁３２（３２ａ，３２ｂ，３２ｃ）まで延びる冷媒配管に接続されている。室内熱交換器３１のガス側は、ガス連絡配管ＧＰまで延びる冷媒配管に接続されている。室内熱交換器３１は、運転時において、伝熱管（図示省略）内の冷媒と、室内ファン３３によって生成される空気流とが熱交換可能なように配置されている。 The indoor heat exchanger 31 is a heat exchanger that functions as a refrigerant evaporator or endothermic during cooling operation and as a refrigerant condenser or radiator during heating operation. The indoor heat exchanger 31 is, for example, a cross fin tube heat exchanger. The liquid side of the indoor heat exchanger 31 is connected to a refrigerant pipe extending to the expansion valves 32 (32a, 32b, 32c). The gas side of the indoor heat exchanger 31 is connected to a refrigerant pipe extending to the gas connecting pipe GP. The indoor heat exchanger 31 is arranged so that the refrigerant in the heat transfer tube (not shown) and the air flow generated by the indoor fan 33 can exchange heat during operation.
　膨張弁３２（３２ａ，３２ｂ，３２ｃ）は、開度調整が可能な電動弁である。膨張弁３２は、運転時において、状況に応じて開度が適宜調整され、開度に応じて冷媒を減圧する。各室内ユニット３０は、１つの膨張弁３２を有している。具体的には、室内ユニット３０ａは、膨張弁３２ａを有し、室内ユニット３０ｂは、膨張弁３２ｂを有し、室内ユニット３０ｃは、膨張弁３２ｃを有している。膨張弁３２ａ，３２ｂ，３２ｃは、それぞれ、対応する室内ユニット３０ａ，３０ｂ，３０ｃの運転状況に応じて開度が適宜調整される。 The expansion valve 32 (32a, 32b, 32c) is an electric valve whose opening degree can be adjusted. The opening degree of the expansion valve 32 is appropriately adjusted according to the situation during operation, and the refrigerant is depressurized according to the opening degree. Each chamber unit 30 has one expansion valve 32. Specifically, the indoor unit 30a has an expansion valve 32a, the indoor unit 30b has an expansion valve 32b, and the indoor unit 30c has an expansion valve 32c. The opening degrees of the expansion valves 32a, 32b, 32c are appropriately adjusted according to the operating conditions of the corresponding indoor units 30a, 30b, 30c, respectively.
　膨張弁３２は、室内熱交換器３１の液側まで延びる冷媒配管、及び、液連絡配管ＬＰまで延びる冷媒配管に接続されている。液連絡配管ＬＰは、室外ユニット１０の第５配管Ｐ５と、各膨張弁３２とを接続する。液連絡配管ＬＰの一端は、第５配管Ｐ５と接続され、液連絡配管ＬＰの他端は、膨張弁３２の数に応じて分岐して各膨張弁３２と個別に接続されている。 The expansion valve 32 is connected to a refrigerant pipe extending to the liquid side of the indoor heat exchanger 31 and a refrigerant pipe extending to the liquid communication pipe LP. The liquid communication pipe LP connects the fifth pipe P5 of the outdoor unit 10 and each expansion valve 32. One end of the liquid communication pipe LP is connected to the fifth pipe P5, and the other end of the liquid communication pipe LP is branched according to the number of expansion valves 32 and is individually connected to each expansion valve 32.
　室内ファン３３は、例えばターボファン、シロッコファン、クロスフローファン又はプロペラファン等の送風機である。室内ファン３３は、室内ファンモータ３３ａの出力軸に接続されている。室内ファン３３は、室内ファンモータ３３ａに連動して駆動する。室内ファン３３は、駆動すると、室内ユニット３０内に吸い込まれて室内熱交換器３１を通過した後に対象空間へと吹き出される空気流を生成する。 The indoor fan 33 is, for example, a blower such as a turbo fan, a sirocco fan, a cross flow fan, or a propeller fan. The indoor fan 33 is connected to the output shaft of the indoor fan motor 33a. The indoor fan 33 is driven in conjunction with the indoor fan motor 33a. When the indoor fan 33 is driven, it generates an air flow that is sucked into the indoor unit 30, passes through the indoor heat exchanger 31, and then blown out to the target space.
　室内ユニット制御部３４は、ＣＰＵ及びメモリ等から構成されるマイクロコンピュータである。室内ユニット制御部３４は、室内ユニット３０の各アクチュエータの動作を制御する。各室内ユニット制御部３４は、室外ユニット制御部１７と、通信線ｃｂ１，ｃｂ２及び給電ユニット４０を介して接続されており、相互に信号の送受信を行う。室内ユニット制御部３４は、リモコン５０と無線通信を行う。 The indoor unit control unit 34 is a microcomputer composed of a CPU, a memory, and the like. The indoor unit control unit 34 controls the operation of each actuator of the indoor unit 30. Each indoor unit control unit 34 is connected to the outdoor unit control unit 17 via communication lines cb1 and cb2 and a power supply unit 40, and transmits and receives signals to and from each other. The indoor unit control unit 34 wirelessly communicates with the remote controller 50.
　室内ユニット３０の室内ユニット制御部３４は、当該室内ユニット３０の膨張弁３２と通信線（図示省略）を介して接続されており、当該膨張弁３２の開度を調整することができる。 The indoor unit control unit 34 of the indoor unit 30 is connected to the expansion valve 32 of the indoor unit 30 via a communication line (not shown), and the opening degree of the expansion valve 32 can be adjusted.
　（１－３）給電ユニット４０
　給電ユニット４０は、室外ユニット制御部１７及び各室内ユニット制御部３４と、通信線ｃｂ１，ｃｂ２を介して接続されている。具体的には、通信線ｃｂ１は、給電ユニット４０と室外ユニット制御部１７とを接続しており、通信線ｃｂ２は、室内ユニット制御部３４の数に応じて分岐し、給電ユニット４０と各室内ユニット制御部３４とを接続している。通信線ｃｂ１は、給電ユニット４０を介して通信線ｃｂ２に接続されている。 (1-3) Power supply unit 40
The power supply unit 40 is connected to the outdoor unit control unit 17 and each indoor unit control unit 34 via communication lines cb1 and cb2. Specifically, the communication line cb1 connects the power supply unit 40 and the outdoor unit control unit 17, and the communication line cb2 branches according to the number of the indoor unit control units 34, and the power supply unit 40 and each indoor unit. It is connected to the unit control unit 34. The communication line cb1 is connected to the communication line cb2 via the power supply unit 40.
　各室内ユニット３０は、建物に設置されている外部の商用電源（図示省略）に接続されている。室内ユニット３０は、正常運転時には商用電源から供給された電力によって稼動している。給電ユニット４０は、複数の室内ユニット３０の少なくとも一部への商用電源が遮断された場合、言い換えると、少なくとも１つの室内ユニット３０への商用電源からの電力供給が停止した場合に、商用電源（以下、単に「電源」と呼ぶ。）が遮断された室内ユニット３０に電力を供給するための補助電源である。通信線ｃｂ２は、室外ユニット制御部１７と各室内ユニット制御部３４との間で送受信される信号の他に、給電ユニット４０から各室内ユニット３０に供給される電力を伝送する。 Each indoor unit 30 is connected to an external commercial power source (not shown) installed in the building. The indoor unit 30 is operated by electric power supplied from a commercial power source during normal operation. The power supply unit 40 receives a commercial power supply (in other words, when the power supply from the commercial power supply to at least one indoor unit 30 is stopped when the commercial power supply to at least a part of the plurality of indoor units 30 is cut off. Hereinafter, it is simply referred to as "power supply") and is an auxiliary power source for supplying power to the indoor unit 30 in which the power is cut off. The communication line cb2 transmits the electric power supplied from the power supply unit 40 to each indoor unit 30 in addition to the signals transmitted and received between the outdoor unit control unit 17 and each indoor unit control unit 34.
　（１－４）リモコン５０
　リモコン５０は、ＣＰＵ及びメモリ等から構成されるマイクロコンピュータを含むリモコン制御部（図示省略）と、空調システム１００へ各種コマンドを入力するための入力キーを含むリモコン入力部（図示省略）とを有するデバイスである。 (1-4) Remote control 50
The remote controller 50 has a remote controller control unit (not shown) including a microcomputer composed of a CPU, a memory, and the like, and a remote controller input unit (not shown) including input keys for inputting various commands to the air conditioning system 100. It is a device.
　空調システム１００は、室内ユニット３０と同数のリモコン５０を有している。リモコン５０は、いずれかの室内ユニット３０と一対一で対応づけられている。リモコン５０は、対応する室内ユニット３０の室内ユニット制御部３４と、赤外線及び電波等を用いて無線通信を行う。リモコン５０は、ユーザ及び管理者等によってリモコン入力部へコマンドが入力されると、入力されたコマンドに応じて、所定の信号を室内ユニット制御部３４に送信する。 The air conditioning system 100 has the same number of remote controllers 50 as the indoor unit 30. The remote controller 50 is one-to-one associated with any of the indoor units 30. The remote controller 50 performs wireless communication with the indoor unit control unit 34 of the corresponding indoor unit 30 by using infrared rays, radio waves, and the like. When a command is input to the remote controller input unit by a user, an administrator, or the like, the remote controller 50 transmits a predetermined signal to the indoor unit control unit 34 in response to the input command.
　（１－５）コントローラ６０
　空調システム１００では、室外ユニット１０の室外ユニット制御部１７と、各室内ユニット３０（３０ａ，３０ｂ，３０ｃ）の室内ユニット制御部３４とが通信線ｃｂ１，ｃｂ２及び給電ユニット４０を介して接続されることで、コントローラ６０が構成されている。コントローラ６０は、空調システム１００の動作を制御する。 (1-5) Controller 60
In the air conditioning system 100, the outdoor unit control unit 17 of the outdoor unit 10 and the indoor unit control unit 34 of each indoor unit 30 (30a, 30b, 30c) are connected via communication lines cb1, cb2 and a power supply unit 40. As a result, the controller 60 is configured. The controller 60 controls the operation of the air conditioning system 100.
　（２）空調システム１００の運転
　いずれかのリモコン５０に運転開始コマンドが入力され、コントローラ６０によって冷房運転又は暖房運転に係る制御が実行されると、四路切換弁１２が所定の状態に切り換えられ、圧縮機１１及び室外ファン１５が起動する。その後、運転開始コマンドが入力されたリモコン５０に対応する室内ユニット３０が運転状態（室内ファン３３が稼動している状態）となる。 (2) Operation of the air conditioning system 100 When an operation start command is input to any remote controller 50 and the controller 60 executes control related to the cooling operation or the heating operation, the four-way switching valve 12 is switched to a predetermined state. , The compressor 11 and the outdoor fan 15 are activated. After that, the indoor unit 30 corresponding to the remote controller 50 to which the operation start command is input is put into the operating state (the state in which the indoor fan 33 is operating).
　（２－１）冷房運転
　冷房運転時には、四路切換弁１２が冷房サイクル状態（図１の四路切換弁１２の実線で示された状態）に切り換えられる。この状態で各アクチュエータが起動すると、冷媒が、第２配管Ｐ２を介して圧縮機１１に吸入され、圧縮される。圧縮機１１から吐出された冷媒は、第３配管Ｐ３、四路切換弁１２、及び第４配管Ｐ４を通過して室外熱交換器１３に流入する。 (2-1) Cooling operation During the cooling operation, the four-way switching valve 12 is switched to the cooling cycle state (the state shown by the solid line of the four-way switching valve 12 in FIG. 1). When each actuator is activated in this state, the refrigerant is sucked into the compressor 11 via the second pipe P2 and compressed. The refrigerant discharged from the compressor 11 passes through the third pipe P3, the four-way switching valve 12, and the fourth pipe P4, and flows into the outdoor heat exchanger 13.
　室外熱交換器１３に流入した冷媒は、室外ファン１５が生成する空気流と熱交換して凝縮（又は放熱）する。室外熱交換器１３から流出した冷媒は、第５配管Ｐ５及び液連絡配管ＬＰを通過して、各室内ユニット３０に流入する。 The refrigerant flowing into the outdoor heat exchanger 13 exchanges heat with the air flow generated by the outdoor fan 15 and condenses (or dissipates heat). The refrigerant flowing out of the outdoor heat exchanger 13 passes through the fifth pipe P5 and the liquid communication pipe LP and flows into each indoor unit 30.
　室内ユニット３０に流入した冷媒は、膨張弁３２に流入する。膨張弁３２に流入した冷媒は、膨張弁３２の開度に応じて減圧される。膨張弁３２から流出した冷媒は、室内熱交換器３１に流入し、室内ファン３３によって生成される空気流と熱交換して蒸発（又は吸熱）する。室内熱交換器３１から流出した冷媒は、ガス連絡配管ＧＰを通過して室外ユニット１０に流入する。 The refrigerant that has flowed into the indoor unit 30 flows into the expansion valve 32. The refrigerant that has flowed into the expansion valve 32 is depressurized according to the opening degree of the expansion valve 32. The refrigerant flowing out of the expansion valve 32 flows into the indoor heat exchanger 31 and exchanges heat with the air flow generated by the indoor fan 33 to evaporate (or absorb heat). The refrigerant flowing out of the indoor heat exchanger 31 passes through the gas connecting pipe GP and flows into the outdoor unit 10.
　室外ユニット１０に流入した冷媒は、第１配管Ｐ１、四路切換弁１２、及び第２配管Ｐ２を通過して、再び圧縮機１１に吸入されて圧縮される。 The refrigerant that has flowed into the outdoor unit 10 passes through the first pipe P1, the four-way switching valve 12, and the second pipe P2, and is sucked into the compressor 11 again to be compressed.
　（２－２）暖房運転
　暖房運転時には、四路切換弁１２が暖房サイクル状態（図１の四路切換弁１２の破線で示された状態）に切り換えられる。この状態で各アクチュエータが起動すると、冷媒が、第２配管Ｐ２を介して圧縮機１１に吸入され、圧縮される。圧縮機１１から吐出された冷媒は、第３配管Ｐ３、四路切換弁１２、第１配管Ｐ１及びガス連絡配管ＧＰを通過して各室内ユニット３０に流入する。 (2-2) Heating operation During the heating operation, the four-way switching valve 12 is switched to the heating cycle state (the state shown by the broken line of the four-way switching valve 12 in FIG. 1). When each actuator is activated in this state, the refrigerant is sucked into the compressor 11 via the second pipe P2 and compressed. The refrigerant discharged from the compressor 11 passes through the third pipe P3, the four-way switching valve 12, the first pipe P1 and the gas connecting pipe GP, and flows into each indoor unit 30.
　室内ユニット３０に流入した冷媒は、室内熱交換器３１に流入し、室内ファン３３が生成する空気流と熱交換して凝縮（又は放熱）する。室内熱交換器３１から流出した冷媒は、膨張弁３２に流入し、膨張弁３２の開度に応じて減圧される。膨張弁３２から流出した冷媒は、液連絡配管ＬＰを通過して室外ユニット１０に流入する。 The refrigerant that has flowed into the indoor unit 30 flows into the indoor heat exchanger 31 and exchanges heat with the air flow generated by the indoor fan 33 to condense (or dissipate heat). The refrigerant flowing out of the indoor heat exchanger 31 flows into the expansion valve 32 and is depressurized according to the opening degree of the expansion valve 32. The refrigerant flowing out of the expansion valve 32 passes through the liquid communication pipe LP and flows into the outdoor unit 10.
　室外ユニット１０に流入した冷媒は、第５配管Ｐ５を通過して室外熱交換器１３に流入する。室外熱交換器１３に流入した冷媒は、室外ファン１５によって生成される空気流と熱交換して蒸発（または吸熱）する。室外熱交換器１３から流出した冷媒は、第４配管Ｐ４、四路切換弁１２、及び第２配管Ｐ２を通過して、再び圧縮機１１に吸入されて圧縮される。 The refrigerant that has flowed into the outdoor unit 10 passes through the fifth pipe P5 and flows into the outdoor heat exchanger 13. The refrigerant flowing into the outdoor heat exchanger 13 exchanges heat with the air flow generated by the outdoor fan 15 and evaporates (or absorbs heat). The refrigerant flowing out of the outdoor heat exchanger 13 passes through the fourth pipe P4, the four-way switching valve 12, and the second pipe P2, and is sucked into the compressor 11 again to be compressed.
　（２－３）油戻し運転
　油戻し運転は、冷媒回路ＲＣ内に分散した潤滑油を、圧縮機１１の中へ戻すために、冷媒を循環させるものである。油戻し運転においては、冷媒を循環させるため、膨張弁３２が開かれる。油戻し運転時には、室内ファン３３を停止させてもよい。 (2-3) Oil return operation In the oil return operation, the refrigerant is circulated in order to return the lubricating oil dispersed in the refrigerant circuit RC into the compressor 11. In the oil return operation, the expansion valve 32 is opened to circulate the refrigerant. The indoor fan 33 may be stopped during the oil return operation.
　（２－４）デフロスト運転
　デフロスト運転は、暖房運転に起因して室外熱交換器１３に生じた霜を、融解させるものである。デフロスト運転時には、四路切換弁１２を冷房サイクル状態に切り換える。デフロスト運転時には、室内ファン３３を停止させる。 (2-4) Defrost operation The defrost operation melts the frost generated in the outdoor heat exchanger 13 due to the heating operation. During the defrost operation, the four-way switching valve 12 is switched to the cooling cycle state. During the defrost operation, the indoor fan 33 is stopped.
　（３）通常制御モードとＭ／Ｔ制御モード
　図２は、空調システム１００全体の運転の制御フローを表す。図２に示されるように、空調システム１００全体は、通常制御モード、又は、マルチテナント制御モード（以下、「Ｍ／Ｔ制御モード」と呼ぶ。）で運転する。 (3) Normal control mode and M / T control mode FIG. 2 shows a control flow of operation of the entire air conditioning system 100. As shown in FIG. 2, the entire air conditioning system 100 operates in a normal control mode or a multi-tenant control mode (hereinafter, referred to as “M / T control mode”).
　通常制御モードでは、１台の室外ユニットと１台の室内ユニットとからなる従来のシステムでも採用されている、通常時における運転制御が行われる。通常制御モードでは、空調システム１００の全ての室内ユニット３０の電源は遮断されておらず、外部の電源から電力の供給を受けている。通常制御モードでは、空調システム１００は、リモコン５０の操作等によって、空調運転を開始して停止状態から定常状態（通常時における運転制御が行われている状態）に移行したり、空調運転を停止して定常状態から停止状態に移行したりする。定常状態から停止状態に移行する際には、必要に応じて、油戻し運転及びデフロスト運転が行われる。 In the normal control mode, the normal operation control, which is also used in the conventional system consisting of one outdoor unit and one indoor unit, is performed. In the normal control mode, the power supplies of all the indoor units 30 of the air conditioning system 100 are not cut off, and power is supplied from an external power source. In the normal control mode, the air conditioning system 100 starts the air conditioning operation by operating the remote controller 50 or the like, shifts from a stopped state to a steady state (a state in which operation control is performed in the normal state), or stops the air conditioning operation. Then, it shifts from the steady state to the stopped state. When shifting from the steady state to the stopped state, an oil return operation and a defrost operation are performed as necessary.
　通常制御モードで運転している空調システム１００は、室内ユニット３０の少なくとも一部の電源が遮断された場合、Ｍ／Ｔ制御モードに移行する（図２の実線の矢印を参照）。Ｍ／Ｔ制御モードでは、少なくとも１台の室内ユニット３０は、電源が遮断されて運転停止状態となっている。Ｍ／Ｔ制御モードでは、電源が遮断された室内ユニット３０（以下、「電源遮断室内ユニット３０」と呼ぶ）は、給電ユニット４０から補助電力の供給を受ける。 The air conditioning system 100 operating in the normal control mode shifts to the M / T control mode when at least a part of the power supply of the indoor unit 30 is cut off (see the solid line arrow in FIG. 2). In the M / T control mode, the power of at least one indoor unit 30 is cut off and the operation is stopped. In the M / T control mode, the indoor unit 30 whose power is cut off (hereinafter referred to as “power cutoff indoor unit 30”) receives auxiliary power from the power supply unit 40.
　（４）Ｍ／Ｔ制御モードの詳細
　各運転において電源遮断室内ユニット３０が発生した場合のコントローラ６０及び判断部９０の動作について説明する。 (4) Details of M / T Control Mode The operation of the controller 60 and the determination unit 90 when the power cutoff chamber unit 30 occurs in each operation will be described.
　（４－１）油戻し運転
　図３は、油戻し運転中に電源遮断室内ユニット３０が発生した場合のＭ／Ｔ制御モードのフローチャートである。判断部９０は、油戻し運転を継続するか否かを、電源遮断室内ユニット３０の数、油戻し運転の残り所要時間、給電ユニットの給電可能電力、などに基づいて判断する（Ｓ１０１）。 (4-1) Oil return operation FIG. 3 is a flowchart of the M / T control mode when the power cutoff chamber unit 30 occurs during the oil return operation. The determination unit 90 determines whether or not to continue the oil return operation based on the number of power cutoff chamber units 30, the remaining time required for the oil return operation, the power that can be supplied by the power supply unit, and the like (S101).
　判断部９０が、油戻し運転を継続すると判断した場合（Ｓ１０１：ＹＥＳ）、コントローラ６０は油戻し運転を継続する（Ｓ１０２）。一方、判断部９０が、油戻し運転を継続しないと判断した場合（Ｓ１０１：ＮＯ）、コントローラ６０は圧縮機１１が吸入する冷媒の湿り度合を取得する（Ｓ１０３）。 When the determination unit 90 determines that the oil return operation is to be continued (S101: YES), the controller 60 continues the oil return operation (S102). On the other hand, when the determination unit 90 determines that the oil return operation is not continued (S101: NO), the controller 60 acquires the degree of wetness of the refrigerant sucked by the compressor 11 (S103).
　次いで、コントローラ６０は、取得した冷媒の湿り度合に基づいて、圧縮機１１を停止させるか否かを決定する（Ｓ１０４）。コントローラ６０が圧縮機１１を停止させないと判断した場合（Ｓ１０４：ＮＯ）、コントローラ６０は、ステップＳ１０３へ戻る。一方、コントローラ６０が圧縮機１１を停止させると判断した場合（Ｓ１０４：ＹＥＳ）、コントローラは圧縮機１１を停止させる。 Next, the controller 60 determines whether or not to stop the compressor 11 based on the degree of wetness of the acquired refrigerant (S104). If it is determined that the controller 60 does not stop the compressor 11 (S104: NO), the controller 60 returns to step S103. On the other hand, when the controller 60 determines to stop the compressor 11 (S104: YES), the controller stops the compressor 11.
　（４－２）デフロスト運転
　図４は、デフロスト運転中に電源遮断室内ユニット３０が発生した場合のフローチャートである。判断部９０は、デフロストを継続するか否かを、電源遮断室内ユニット３０の数、デフロスト運転の残り所要時間、給電ユニットの給電可能電力などに基づいて判断する（Ｓ２０１）。 (4-2) Defrost operation FIG. 4 is a flowchart when the power cutoff chamber unit 30 occurs during the defrost operation. The determination unit 90 determines whether or not to continue the defrost based on the number of the power cutoff chamber units 30, the remaining time required for the defrost operation, the power that can be supplied by the power supply unit, and the like (S201).
　判断部９０が、デフロスト運転を継続すると判断した場合（Ｓ２０１：ＹＥＳ）、コントローラ６０はデフロスト運転を継続する（Ｓ２０２）。一方、判断部９０が、デフロスト運転を継続しないと判断した場合（Ｓ２０１：ＮＯ）、コントローラ６０は圧縮機１１を停止させる。 When the determination unit 90 determines that the defrost operation is continued (S201: YES), the controller 60 continues the defrost operation (S202). On the other hand, when the determination unit 90 determines that the defrost operation is not continued (S201: NO), the controller 60 stops the compressor 11.
　なお、デフロスト運転を継続する場合（Ｓ２０２）、通常制御モードと同様のデフロスト運転が行われる。例えば、暖房運転中においてまず膨張弁３２が閉じられ、次いで四路切換弁１２が冷房サイクル状態に切り換えられる。次いで、膨張弁３２が開けられる。こうすることで、四路切換弁の切換による騒音がユーザに聞こえる事態を抑制できる。 When the defrost operation is continued (S202), the defrost operation similar to the normal control mode is performed. For example, during the heating operation, the expansion valve 32 is first closed, and then the four-way switching valve 12 is switched to the cooling cycle state. The expansion valve 32 is then opened. By doing so, it is possible to suppress a situation in which the user hears the noise caused by the switching of the four-way switching valve.
　（５）特徴
　（５－１）
　判断部９０が、油戻し運転又はデフロスト運転を継続するか否かを判断する。したがって、油戻し運転又はデフロスト運転の実行中に、電源遮断室内ユニット３０が発生した場合であっても、空調システム１００が損傷しないと考えられる場合は、油戻し運転又はデフロスト運転を実行し続けることができる。 (5) Features (5-1)
The determination unit 90 determines whether to continue the oil return operation or the defrost operation. Therefore, even if the power cutoff indoor unit 30 occurs during the oil return operation or the defrost operation, if it is considered that the air conditioning system 100 is not damaged, the oil return operation or the defrost operation should be continued. Can be done.
　（５－２）
　判断部９０が油戻し運転又はデフロスト運転を継続しないと判断する場合、コントローラ６０は圧縮機１１を停止させる。したがって、電源遮断室内ユニット３０の発生時に空調システム１００全体の運転を停止することにより、空調システム１００の損傷を抑制することができる。 (5-2)
When the determination unit 90 determines that the oil return operation or the defrost operation is not continued, the controller 60 stops the compressor 11. Therefore, damage to the air conditioning system 100 can be suppressed by stopping the operation of the entire air conditioning system 100 when the power cutoff indoor unit 30 is generated.
　（５－３）
　コントローラ６０は、圧縮機１１が吸入する冷媒の湿り度合に基づいて圧縮機１１を停止させる。したがって、圧縮機１１が多量の液冷媒を吸入することを抑制し、圧縮機１１の損傷を低減できる。 (5-3)
The controller 60 stops the compressor 11 based on the degree of wetness of the refrigerant sucked by the compressor 11. Therefore, it is possible to suppress the compressor 11 from sucking a large amount of liquid refrigerant and reduce the damage to the compressor 11.
　（６）変形例
　以下に上述の実施形態の変形例について説明する。複数の実施形態を組み合わせてもよい。 (6) Modification Example A modification of the above-described embodiment will be described below. A plurality of embodiments may be combined.
　（６－１）変形例Ａ
　上記実施形態では、電源遮断室内ユニット３０の発生時に油戻し運転を継続する場合、すべての室内ユニット３０（３０ａ～３０ｃ）について同時に油戻し運転を行う。これに代えて、室内ユニット３０を複数のグループに分け、それぞれのグループに対して順次油戻し運転を実行してもよい。図５では、室内ユニット３０は第１グループＧ１（３０ａ、３０ｂ）及び第２グループ（３０ｃ）に分けられる。 (6-1) Modification A
In the above embodiment, when the oil return operation is continued when the power cutoff indoor unit 30 is generated, the oil return operation is performed for all the indoor units 30 (30a to 30c) at the same time. Instead of this, the indoor unit 30 may be divided into a plurality of groups, and the oil return operation may be sequentially executed for each group. In FIG. 5, the indoor unit 30 is divided into a first group G1 (30a, 30b) and a second group (30c).
　図６に示すように、判断部９０が油戻し運転を継続すると判断する場合（Ｓ１０１：ＹＥＳ）、コントローラ６０は第１グループ閉鎖制御（Ｓ１０２－１）を実行する。第１グループ閉鎖制御では、第１グループＧ１に属する室内ユニット３０（３０ａ、３０ｂ）の膨張弁３２（３２ａ、３２ｂ）が閉じられるとともに、第２グループＧ２に属する室内ユニット３０（３０ｃ）の膨張弁３２（３２ｃ）が開けられる。この状態で、油戻し運転が実行される。 As shown in FIG. 6, when the determination unit 90 determines that the oil return operation is to be continued (S101: YES), the controller 60 executes the first group closure control (S102-1). In the first group closing control, the expansion valve 32 (32a, 32b) of the indoor unit 30 (30a, 30b) belonging to the first group G1 is closed, and the expansion valve of the indoor unit 30 (30c) belonging to the second group G2 is closed. 32 (32c) can be opened. In this state, the oil return operation is executed.
　次いで、コントローラ６０は第２グループ閉鎖制御（Ｓ１０２－２）を実行する。第２グループ閉鎖制御では、第１グループＧ１に属する室内ユニット３０（３０ａ、３０ｂ）の膨張弁３２（３２ａ、３２ｂ）が開けられるとともに、第２グループＧ２に属する室内ユニット３０（３０ｃ）の膨張弁３２（３２ｃ）が閉められる。この状態で、油戻し運転が実行される。 Next, the controller 60 executes the second group closure control (S102-2). In the second group closing control, the expansion valve 32 (32a, 32b) of the indoor unit 30 (30a, 30b) belonging to the first group G1 is opened, and the expansion valve of the indoor unit 30 (30c) belonging to the second group G2 is opened. 32 (32c) is closed. In this state, the oil return operation is executed.
　（６－２）変形例Ｂ
　上記実施形態では、電源遮断室内ユニット３０の発生時にデフロスト運転を継続する場合、通常制御モードと同様のデフロスト運転を実行する。これに代えて、Ｍ／Ｔ制御モードにおいては通常制御モードとは異なるデフロスト運転を実行してもよい。 (6-2) Modification B
In the above embodiment, when the defrost operation is continued when the power cutoff chamber unit 30 is generated, the defrost operation similar to the normal control mode is executed. Instead of this, in the M / T control mode, a defrost operation different from the normal control mode may be executed.
　例えば、図７に示すように、暖房運転中に判断部９０がデフロスト運転を継続すると判断する場合（Ｓ２０１：ＹＥＳ）、コントローラ６０は、室内ユニット３０の膨張弁を開いたまま、四路切換弁１２を冷房サイクル状態に切り換える（Ｓ２０２－１）。 For example, as shown in FIG. 7, when the determination unit 90 determines that the defrost operation is continued during the heating operation (S201: YES), the controller 60 keeps the expansion valve of the indoor unit 30 open and the four-way switching valve. 12 is switched to the cooling cycle state (S202-1).
　この構成によれば、騒音処理のために膨張弁を閉じる動作が省かれるので、給電ユニット４０が膨張弁３２に供給する電力が少なくてすむ。 According to this configuration, the operation of closing the expansion valve is omitted for noise processing, so that the power supplied by the power supply unit 40 to the expansion valve 32 can be reduced.
　（６－３）変形例Ｃ
　室外ユニット１０は、図１に示されていない他の構成要素をさらに有してもよい。図８は、本変形例における空調システム１００の概略構成図である。図８において、室外ユニット１０は、オイルセパレータ１４、膨張弁１６、レシーバ１８及びアキュームレータ１９をさらに有する。 (6-3) Modification C
The outdoor unit 10 may further have other components not shown in FIG. FIG. 8 is a schematic configuration diagram of the air conditioning system 100 in this modified example. In FIG. 8, the outdoor unit 10 further includes an oil separator 14, an expansion valve 16, a receiver 18, and an accumulator 19.
　オイルセパレータ１４は、第３配管Ｐ３に取り付けられる。オイルセパレータ１４は、圧縮機１１から吐出された高圧のガス冷媒から、冷媒の中に混入している潤滑油を除去する。 The oil separator 14 is attached to the third pipe P3. The oil separator 14 removes the lubricating oil mixed in the refrigerant from the high-pressure gas refrigerant discharged from the compressor 11.
　膨張弁１６は、第５配管Ｐ５に取り付けられる。膨張弁１６は、開度調整が可能な電動弁である。膨張弁１６は、空調システム１００の運転時において、状況に応じて開度が適宜調整され、開度に応じて冷媒を減圧する。 The expansion valve 16 is attached to the fifth pipe P5. The expansion valve 16 is an electric valve whose opening degree can be adjusted. The opening degree of the expansion valve 16 is appropriately adjusted according to the situation during the operation of the air conditioning system 100, and the refrigerant is depressurized according to the opening degree.
　レシーバ１８は、第５配管Ｐ５に取り付けられる。レシーバ１８は、膨張弁１６と液連絡配管ＬＰとの間に取り付けられる。レシーバ１８は、空調システム１００の運転状況に応じて、室外熱交換器１３及び室内熱交換器３１内の冷媒量の変化を吸収するために、冷媒を一時的に貯留する。レシーバ１８は、冷媒回路ＲＣを循環する冷媒に含まれる水分及び異物を除去するための機構を有してもよい。 The receiver 18 is attached to the fifth pipe P5. The receiver 18 is attached between the expansion valve 16 and the liquid communication pipe LP. The receiver 18 temporarily stores the refrigerant in order to absorb the change in the amount of the refrigerant in the outdoor heat exchanger 13 and the indoor heat exchanger 31 according to the operating condition of the air conditioning system 100. The receiver 18 may have a mechanism for removing water and foreign matter contained in the refrigerant circulating in the refrigerant circuit RC.
　アキュームレータ１９は、第２配管Ｐ２に取り付けられる。アキュームレータ１９は、冷媒回路ＲＣを流れる気液混合冷媒を、ガス冷媒と液冷媒とに分離し、ガス冷媒のみを圧縮機１１の吸入ポートに送る。 The accumulator 19 is attached to the second pipe P2. The accumulator 19 separates the gas-liquid mixed refrigerant flowing through the refrigerant circuit RC into a gas refrigerant and a liquid refrigerant, and sends only the gas refrigerant to the suction port of the compressor 11.
　なお、図８において、室外ユニット１０は、レシーバ１８又はアキュームレータ１９を有していなくてもよい。 Note that, in FIG. 8, the outdoor unit 10 does not have to have the receiver 18 or the accumulator 19.
　実施形態及び変形例Ａ～Ｂにおいて説明した内容は、図８に示される空調システム１００においても適用可能である。 The contents described in the embodiments and the modified examples A to B can also be applied to the air conditioning system 100 shown in FIG.
　（６－４）変形例Ｄ
　図９は変形例Ｄに係る空調システム１００の動作である。 (6-4) Modification D
FIG. 9 shows the operation of the air conditioning system 100 according to the modified example D.
　いかなる運転中であれ、電源遮断室内ユニット３０が発生した場合に、Ｍ／Ｔ制御モードは開始する（Ｓ３００）。次いで、コントローラ６０は圧縮機１１が吸入する冷媒の湿り度合を取得する（Ｓ３０１）。次いで、判断部９０は、取得した冷媒の湿り度合、又は、それに基づく湿り度合いの将来的な予測が異常であるか否かを判断する（Ｓ３０２）。異常である場合（Ｓ３０２：ＹＥＳ）、判断部９０はコントローラ６０に対し、圧縮機１１を停止させる旨の指令を送る（Ｓ３０５）。これは、圧縮機１１の破損を防ぐためである。湿り度合い等が正常である場合（Ｓ３０２：ＮＯ）、コントローラ６０は、電源遮断室内ユニット３０の膨張弁の開度の情報を取得する（Ｓ３０３）。判断部９０は、取得した開度の情報から、電源遮断室内ユニット３０おけるドレン水量、又はドレン水量の将来的な予測を導出する。次いで、判断部９０は、導出された値に基づいて、電源遮断室内ユニット３０においてドレン水があふれるおそれの有無を判断する（Ｓ３０４）。ドレン水あふれのおそれがある場合（Ｓ３０４：ＹＥＳ）、判断部９０はコントローラ６０に対し、圧縮機１１を停止させる旨の指令を送る（Ｓ３０５）。これは、電源遮断室内ユニット３０においてドレン水をあふれさせないためである。ドレン水あふれのおそれがない場合（Ｓ３０４：ＮＯ）、これまでに説明した実施形態又は変形例におけるステップＳ１００又はステップＳ２００へ移行する。 The M / T control mode starts when the power cutoff indoor unit 30 occurs during any operation (S300). Next, the controller 60 acquires the degree of wetness of the refrigerant sucked by the compressor 11 (S301). Next, the determination unit 90 determines whether or not the degree of wetness of the acquired refrigerant or the future prediction of the degree of wetness based on the degree of wetness is abnormal (S302). If it is abnormal (S302: YES), the determination unit 90 sends a command to the controller 60 to stop the compressor 11 (S305). This is to prevent damage to the compressor 11. When the degree of wetness or the like is normal (S302: NO), the controller 60 acquires information on the opening degree of the expansion valve of the power cutoff chamber unit 30 (S303). The determination unit 90 derives the drain water amount in the power cutoff chamber unit 30 or the future prediction of the drain water amount from the acquired opening degree information. Next, the determination unit 90 determines whether or not there is a possibility that the drain water will overflow in the power cutoff chamber unit 30 based on the derived value (S304). When there is a risk of drain water overflow (S304: YES), the determination unit 90 sends a command to the controller 60 to stop the compressor 11 (S305). This is to prevent the drain water from overflowing in the power cutoff chamber unit 30. When there is no risk of drain water overflow (S304: NO), the process proceeds to step S100 or step S200 in the embodiment or modification described so far.
　実施形態及び変形例Ａ～Ｃにおいて説明した内容は、図９のフローチャートを用いて説明した空調システム１００においても適用可能である。 The contents described in the embodiments and the modified examples A to C can also be applied to the air conditioning system 100 described using the flowchart of FIG.
　＜むすび＞
　以上、本開示の実施形態を説明したが、請求の範囲に記載された本開示の趣旨及び範囲から逸脱することなく、形態や詳細の多様な変更が可能なことが理解されるであろう。 <Conclusion>
Although the embodiments of the present disclosure have been described above, it will be understood that various modifications of the forms and details are possible without departing from the purpose and scope of the present disclosure described in the claims.
　１０　　　室外ユニット
　１１　　　圧縮機
　１２　　　四路切換弁
　３０　　　室内ユニット
　３２　　　膨張弁
　４０　　　給電ユニット
　６０　　　コントローラ
　９０　　　判断部
１００　　　空調システム
　ＲＣ　　　冷媒回路（冷媒サイクル） 10 Outdoor unit 11 Compressor 12 Four-way switching valve 30 Indoor unit 32 Expansion valve 40 Power supply unit 60 Controller 90 Judgment unit 100 Air conditioning system RC Refrigerant circuit (refrigerant cycle)
特開２０１３－４０６９８号公報Japanese Unexamined Patent Publication No. 2013-40998

Claims (10)

  1. 　圧縮機（１１）を含む室外ユニット（１０）、及び複数の室内ユニット（３０）を含む冷媒サイクル（ＲＣ）と、
    　複数の前記室内ユニットの少なくとも一部への電源が遮断される場合に、前記少なくとも一部へ補助電源の供給を行う給電ユニット（４０）と、
    　少なくとも前記圧縮機を制御するコントローラ（６０）と、
    　複数の前記室内ユニットの前記少なくとも一部への電源が遮断される場合に、
    　　前記圧縮機を停止させる、及び、
    　　前記圧縮機に運転を継続させる、
    の一方の判断を行い、前記判断に対応する指令を前記コントローラに送る判断部（９０）と、
    を備える、
    空調システム。     An outdoor unit (10) including a compressor (11) and a refrigerant cycle (RC) including a plurality of indoor units (30).
    A power supply unit (40) that supplies auxiliary power to at least a part of the indoor unit when power is cut off from the plurality of indoor units.
    At least a controller (60) that controls the compressor,
    When power is cut off to at least a part of the plurality of indoor units.
    Stop the compressor and
    Let the compressor continue to operate,
    A determination unit (90) that makes one of the determinations and sends a command corresponding to the determination to the controller.
    To prepare
    Air conditioning system.
  2. 　前記判断部は、
    　　前記圧縮機が吸入する冷媒の湿り度合又は前記湿り度合いの予測、及び
    　　前記複数の室内ユニットの前記少なくとも一部におけるドレン水量又は前記ドレン水量の予測、
    の少なくとも一方に基づいて前記判断を行う、
    請求項１に記載の空調システム。     The judgment unit
    Prediction of the degree of wetness of the refrigerant sucked by the compressor or the degree of wetness, and prediction of the amount of drain water or the amount of drain water in the at least a part of the plurality of indoor units.
    Make the above judgment based on at least one of
    The air conditioning system according to claim 1.
  3. 　前記判断部は、
    　　前記複数の室内ユニットの前記少なくとも一部における前記ドレン水量又は前記ドレン水量の前記予測、及び、
    　　前記給電ユニットの給電容量、
    に基づいて前記判断を行う、
    請求項２に記載の空調システム。     The judgment unit
    The amount of drain water in the at least a part of the plurality of indoor units or the prediction of the amount of drain water, and
    The power supply capacity of the power supply unit,
    Make the above judgment based on
    The air conditioning system according to claim 2.
  4. 　前記コントローラは、少なくとも前記圧縮機に、前記冷媒サイクルにおける油戻し運転又はデフロスト運転を実行させ、
    　前記判断部は、前記給電ユニットが前記少なくとも一部に前記補助電源を供給する場合において、前記油戻し運転又は前記デフロスト運転を継続するか否かを判断する、
    請求項１から３のいずれか１項に記載の空調システム。     The controller causes at least the compressor to perform an oil return operation or a defrost operation in the refrigerant cycle.
    The determination unit determines whether to continue the oil return operation or the defrost operation when the power supply unit supplies the auxiliary power supply to at least a part of the power supply unit.
    The air conditioning system according to any one of claims 1 to 3.
  5. 　前記コントローラが前記冷媒サイクルに前記油戻し運転を実行させている際に、前記判断部が前記油戻し運転を継続しないと判断する場合、前記コントローラは前記圧縮機を停止させる、
    請求項４に記載の空調システム。     When the controller determines that the oil return operation is not continued while the refrigerant cycle is executing the oil return operation, the controller stops the compressor.
    The air conditioning system according to claim 4.
  6. 　前記コントローラは、前記圧縮機が吸入する冷媒の湿り度合に基づいて、前記圧縮機を停止させる、
    請求項５に記載の空調システム。     The controller stops the compressor based on the wetness of the refrigerant sucked by the compressor.
    The air conditioning system according to claim 5.
  7. 　複数の前記室内ユニットの各々は膨張弁（３２）を含み、
    　前記コントローラは、複数の前記室内ユニットを少なくとも２つのグループ（Ｇ１、Ｇ２）に分け、
    　前記コントローラが前記冷媒サイクルに前記油戻し運転を実行させている際に、前記判断部が前記油戻し運転を継続すると判断する場合、前記コントローラは、
    　　第１グループ（Ｇ１）に属する前記室内ユニットの前記膨張弁を閉じ、かつ、第２グループ（Ｇ２）に属する前記室内ユニットの前記膨張弁を開ける、第１グループ閉鎖制御と、
    　　前記第１グループに属する前記室内ユニットの前記膨張弁を開け、かつ、前記第２グループに属する前記室内ユニットの前記膨張弁を閉じる、第２グループ閉鎖制御と、
    を順に実行する、
    請求項４に記載の空調システム。     Each of the plurality of indoor units includes an expansion valve (32).
    The controller divides the plurality of indoor units into at least two groups (G1, G2).
    When the determination unit determines that the oil return operation is to be continued while the controller is causing the refrigerant cycle to execute the oil return operation, the controller determines that the oil return operation is to be continued.
    A first group closing control that closes the expansion valve of the indoor unit belonging to the first group (G1) and opens the expansion valve of the indoor unit belonging to the second group (G2).
    A second group closing control that opens the expansion valve of the indoor unit belonging to the first group and closes the expansion valve of the indoor unit belonging to the second group.
    In order,
    The air conditioning system according to claim 4.
  8. 　前記室外ユニットは、四路切換弁（１２）をさらに含み、
    　前記コントローラが前記冷媒サイクルに前記デフロスト運転を実行させている際に、前記判断部が前記デフロスト運転を継続しないと判断する場合、前記コントローラは前記圧縮機を停止させる、
    請求項４から７のいずれか１項に記載の空調システム。     The outdoor unit further includes a four-way switching valve (12).
    When the controller determines that the defrost operation is not continued while the refrigerant cycle is performing the defrost operation, the controller stops the compressor.
    The air conditioning system according to any one of claims 4 to 7.
  9. 　前記室外ユニットは、四路切換弁（１２）をさらに含み、
    　前記コントローラが前記冷媒サイクルに前記デフロスト運転を実行させている際に、前記判断部が前記デフロスト運転を継続すると判断する場合、前記コントローラは前記四路切換弁を切り替える、
    請求項７に記載の空調システム。     The outdoor unit further includes a four-way switching valve (12).
    When the controller determines that the defrost operation is to be continued while the refrigerant cycle is performing the defrost operation, the controller switches the four-way switching valve.
    The air conditioning system according to claim 7.
  10. 　前記コントローラが前記四路切換弁を切り替える際、複数の前記膨張弁の少なくとも１つが開かれており、前記圧縮機は運転している、
    請求項９に記載の空調システム。     When the controller switches the four-way switching valve, at least one of the plurality of expansion valves is open and the compressor is operating.
    The air conditioning system according to claim 9.
PCT/JP2020/015853 2019-05-28 2020-04-08 Air-conditioning system WO2020241076A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN202080038527.7A CN113874661B (en) 2019-05-28 2020-04-08 Air conditioning system
EP20813372.8A EP3978817B1 (en) 2019-05-28 2020-04-08 Air-conditioning system
US17/614,280 US20220146173A1 (en) 2019-05-28 2020-04-08 Air conditioning system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019-099587 2019-05-28
JP2019099587 2019-05-28

Publications (1)

Publication Number Publication Date
WO2020241076A1 true WO2020241076A1 (en) 2020-12-03

Family

ID=73552333

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2020/015853 WO2020241076A1 (en) 2019-05-28 2020-04-08 Air-conditioning system

Country Status (5)

Country Link
US (1) US20220146173A1 (en)
EP (1) EP3978817B1 (en)
JP (1) JP6844731B2 (en)
CN (1) CN113874661B (en)
WO (1) WO2020241076A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7311755B2 (en) * 2019-05-28 2023-07-20 ダイキン工業株式会社 air conditioning system
JP7375490B2 (en) * 2019-11-21 2023-11-08 株式会社富士通ゼネラル air conditioner

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62238947A (en) * 1986-04-11 1987-10-19 株式会社日立製作所 Operation controller for air conditioner
JP2005077056A (en) * 2003-09-03 2005-03-24 Mitsubishi Electric Corp Air conditioner
JP2008057868A (en) * 2006-08-31 2008-03-13 Daikin Ind Ltd Air conditioner
JP2013040698A (en) 2011-08-11 2013-02-28 Fujitsu General Ltd Multi-type air conditioner
JP2017096531A (en) * 2015-11-20 2017-06-01 三菱重工業株式会社 Air conditioning system, and control method/program thereof
CN109631380A (en) * 2018-11-16 2019-04-16 青岛海尔空调电子有限公司 Air-conditioner outdoor unit group and air conditioner

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3920440B2 (en) * 1998-01-29 2007-05-30 三洋電機株式会社 Compressor control system for air conditioner
US6237357B1 (en) * 1999-06-07 2001-05-29 Mitsubishi Heavy Industries, Ltd. Vehicular air conditioner using heat pump
US7168627B2 (en) * 2004-10-06 2007-01-30 Lawrence Kates Electronically-controlled register vent for zone heating and cooling
US8078326B2 (en) * 2008-09-19 2011-12-13 Johnson Controls Technology Company HVAC system controller configuration
US8290628B2 (en) * 2010-07-23 2012-10-16 Lg Electronics Inc. Air conditioner and method for controlling the same
US20120101673A1 (en) * 2010-10-26 2012-04-26 Jeffrey Andrew Caddick Hybrid Vehicle Control System For Cold Plate Refrigeration And Method Of The Same
JP6166572B2 (en) * 2013-03-29 2017-07-19 パナソニック株式会社 Air conditioning system
CN106123117A (en) * 2016-06-29 2016-11-16 青岛海尔空调电子有限公司 A kind of air conditioning unit and control method of multi-connected machine
WO2018154718A1 (en) * 2017-02-24 2018-08-30 三菱電機株式会社 Air conditioning system
CN109357440B (en) * 2018-10-26 2019-11-05 宁波奥克斯电气股份有限公司 A kind of multi-connected machine heating method for controlling oil return and multi-gang air-conditioner device
JP7311755B2 (en) * 2019-05-28 2023-07-20 ダイキン工業株式会社 air conditioning system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62238947A (en) * 1986-04-11 1987-10-19 株式会社日立製作所 Operation controller for air conditioner
JP2005077056A (en) * 2003-09-03 2005-03-24 Mitsubishi Electric Corp Air conditioner
JP2008057868A (en) * 2006-08-31 2008-03-13 Daikin Ind Ltd Air conditioner
JP2013040698A (en) 2011-08-11 2013-02-28 Fujitsu General Ltd Multi-type air conditioner
JP2017096531A (en) * 2015-11-20 2017-06-01 三菱重工業株式会社 Air conditioning system, and control method/program thereof
CN109631380A (en) * 2018-11-16 2019-04-16 青岛海尔空调电子有限公司 Air-conditioner outdoor unit group and air conditioner

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP3978817A4

Also Published As

Publication number Publication date
EP3978817B1 (en) 2024-01-10
EP3978817A1 (en) 2022-04-06
CN113874661B (en) 2023-03-31
JP2020197370A (en) 2020-12-10
US20220146173A1 (en) 2022-05-12
EP3978817A4 (en) 2022-07-27
CN113874661A (en) 2021-12-31
JP6844731B2 (en) 2021-03-17

Similar Documents

Publication Publication Date Title
EP1953477B1 (en) Refrigerator compressor operating method and refrigerator
JP5481937B2 (en) Air conditioner
WO2021039087A1 (en) Heat source unit and refrigeration device
US20220003463A1 (en) Refrigeration apparatus-use unit, heat source unit, and refrigeration apparatus
JP6844731B2 (en) Air conditioning system
JP7311755B2 (en) air conditioning system
KR100575682B1 (en) Air conditioner with equalization pipe between out door units
JP6747226B2 (en) Refrigeration equipment
JP7311756B2 (en) air conditioning system
WO2020241507A1 (en) Air-conditioning system
WO2015046228A1 (en) Air conditioner
JP2017116154A (en) Air conditioning device
JP7467827B2 (en) Air conditioners
WO2024171704A1 (en) Heat source unit and refrigeration device
WO2015046230A1 (en) Air conditioner
WO2023139701A1 (en) Air conditioner
JP2009192197A (en) Heat pump cycle system
JP4073341B2 (en) Multi-chamber air conditioner and control method thereof
JP2020197323A (en) Air conditioning system
JPH10332186A (en) Air conditioner
WO2013077136A1 (en) Air conditioner
JP4948465B2 (en) Air conditioner
JP2024141982A (en) Air conditioners
JP2023066634A (en) Refrigeration cycle device
JP2011127805A (en) Air conditioning device

Legal Events

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

Ref document number: 20813372

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

ENP Entry into the national phase

Ref document number: 2020813372

Country of ref document: EP

Effective date: 20220103