WO2020241076A1 - Système de climatisation - Google Patents

Système de climatisation Download PDF

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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
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WO
WIPO (PCT)
Prior art keywords
unit
compressor
conditioning system
controller
air conditioning
Prior art date
Application number
PCT/JP2020/015853
Other languages
English (en)
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 US17/614,280 priority Critical patent/US20220146173A1/en
Priority to CN202080038527.7A priority patent/CN113874661B/zh
Priority to EP20813372.8A priority patent/EP3978817B1/fr
Publication of WO2020241076A1 publication Critical patent/WO2020241076A1/fr

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—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.

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  • 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

Système de climatisation (100) comprenantd un cycle de réfrigération (RC), une unité d'alimentation électrique (40), un dispositif de commande (60) et une unité de détermination (90). Le cycle de réfrigération (RC) comprend une unité extérieure (10) et une pluralité d'unités intérieures (30). L'unité extérieure (10) comprend un compresseur (11). Lorsque l'alimentation électrique d'au moins une unité parmi la pluralité d'unités intérieures (30) est coupée, l'unité d'alimentation électrique (40) fournit de l'énergie auxiliaire à l'au moins une unité intérieure. Le dispositif de commande (60) commande au moins le compresseur (11). L'unité de détermination (90) effectue une détermination pour arrêter le compresseur (11) ou pour permettre au compresseur (11) de continuer à fonctionner lorsque l'alimentation électrique d'au moins une unité parmi la pluralité d'unités intérieures (10) est coupée. L'unité de détermination (90) envoie une commande correspondant à la détermination au dispositif de commande (60).
PCT/JP2020/015853 2019-05-28 2020-04-08 Système de climatisation WO2020241076A1 (fr)

Priority Applications (3)

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US17/614,280 US20220146173A1 (en) 2019-05-28 2020-04-08 Air conditioning system
CN202080038527.7A CN113874661B (zh) 2019-05-28 2020-04-08 空调系统
EP20813372.8A EP3978817B1 (fr) 2019-05-28 2020-04-08 Système de climatisation

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JP7375490B2 (ja) * 2019-11-21 2023-11-08 株式会社富士通ゼネラル 空気調和装置

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

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