WO2023210446A1 - 冷凍サイクル装置 - Google Patents

冷凍サイクル装置 Download PDF

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Publication number
WO2023210446A1
WO2023210446A1 PCT/JP2023/015491 JP2023015491W WO2023210446A1 WO 2023210446 A1 WO2023210446 A1 WO 2023210446A1 JP 2023015491 W JP2023015491 W JP 2023015491W WO 2023210446 A1 WO2023210446 A1 WO 2023210446A1
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WIPO (PCT)
Prior art keywords
circuit
compressor
drive circuit
refrigeration cycle
working medium
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2023/015491
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English (en)
French (fr)
Japanese (ja)
Inventor
晃 鶸田
吉朗 土山
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Panasonic Intellectual Property Management Co Ltd
Original Assignee
Panasonic Intellectual Property Management Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Panasonic Intellectual Property Management Co Ltd filed Critical Panasonic Intellectual Property Management Co Ltd
Priority to CN202380036474.9A priority Critical patent/CN119384578A/zh
Priority to EP23796189.1A priority patent/EP4517224A4/en
Priority to JP2024517224A priority patent/JPWO2023210446A1/ja
Priority to US18/860,407 priority patent/US20250290678A1/en
Publication of WO2023210446A1 publication Critical patent/WO2023210446A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/005—Arrangement or mounting of control or safety devices of safety devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • 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
    • 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
    • F25B49/025—Motor control 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
    • 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
    • F25B2400/00—Component parts or details not otherwise provided for in this subclass
    • F25B2400/12—Inflammable refrigerants
    • 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
    • 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
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/15—Power, e.g. by voltage or current
    • F25B2700/151—Power, e.g. by voltage or current of the compressor motor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/17—Speeds
    • F25B2700/171—Speeds of the compressor
    • 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
    • F25B2700/21154—Temperatures of a compressor or the drive means therefor of an inverter
    • 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
    • F25B2700/21156—Temperatures of a compressor or the drive means therefor of the motor

Definitions

  • the present disclosure relates to a refrigeration cycle device.
  • R410A has been widely used as a working medium (heat medium, refrigerant) for refrigeration cycle devices.
  • R410A has a large global warming potential (GWP) of 2090. Therefore, from the perspective of preventing global warming, research and development are being carried out on working media with lower GWP.
  • Patent Document 1 discloses 1,1,2-trifluoroethylene (HFO1123) as a working medium having a smaller GWP than R410A.
  • Patent Document 2 discloses 1,2-difluoroethylene (HFO1132) as a working medium having a smaller GWP than R410A.
  • HFO1123 and HFO1132 have a lower GWP than R410A, but are thereby less stable than R410A. For example, due to the generation of radicals, a disproportionation reaction of HFO1123 or HFO1132 may proceed, and HFO1123 and HFO1132 may change into another compound.
  • the present disclosure provides a refrigeration cycle device that makes it possible to suppress a disproportionation reaction of a working medium.
  • a refrigeration cycle device includes a refrigeration cycle circuit that includes a compressor, a condenser, an expansion valve, and an evaporator, and in which a working medium circulates, and a control device that controls the compressor of the refrigeration cycle circuit.
  • the working medium contains ethylene-based fluoroolefin as a refrigerant component.
  • the compressor includes a closed container that forms a flow path for a working medium, a compression mechanism that is located inside the closed container and compresses the working medium, and an electric motor that is located inside the closed container and operates the compression mechanism.
  • the control device includes a drive circuit that drives the electric motor, a state detection circuit that detects the state of at least one of the compressor and the drive circuit, a temperature measurement circuit that measures the internal temperature of the airtight container of the compressor, and the drive circuit. It has a control circuit for controlling.
  • the control circuit detects an abnormality in at least one of the compressor and the drive circuit based on the state detected by the state detection circuit, and when the internal temperature measured by the temperature measurement circuit exceeds a predetermined temperature, the control circuit stops the drive. Stop the operation of the circuit.
  • aspects of the present disclosure enable suppression of disproportionation reactions in the working medium.
  • Block diagram of a configuration example of a refrigeration cycle device Schematic diagram of a configuration example of the compressor and control device of the refrigeration cycle device in FIG. 1 A flowchart of an example of the operation of the control circuit of the control device in FIG. 2 Schematic diagram of a configuration example of a compressor and a control device of a refrigeration cycle device of Modification 1 Schematic diagram of a configuration example of a compressor and a control device of a refrigeration cycle device according to modification 2 Schematic diagram of a configuration example of a compressor and a control device of a refrigeration cycle device according to modification 3
  • a prefix such as “first” or “second” will be added to the name of the component, but the reference numeral attached to the component will be used. If they are distinguishable from each other, the prefixes such as “first” and “second” may be omitted in consideration of the readability of the text.
  • FIG. 1 is a block diagram of a configuration example of a refrigeration cycle device 1 according to the present embodiment.
  • the refrigeration cycle device 1 in FIG. 1 constitutes, for example, an air conditioner capable of cooling operation and heating operation.
  • the refrigeration cycle device 1 in FIG. 1 includes a refrigeration cycle circuit 2 and a control device 3.
  • the refrigeration cycle circuit 2 constitutes a flow path through which a working medium circulates.
  • the working medium contains ethylene-based fluoroolefin as a refrigerant component.
  • the ethylene-based fluoroolefin is preferably an ethylene-based fluoroolefin that undergoes a disproportionation reaction.
  • Examples of ethylene-based fluoroolefins that cause disproportionation reactions include 1,1,2-trifluoroethylene (HFO1123), trans-1,2-difluoroethylene (HFO1132(E)), and cis-1,2-difluoroethylene.
  • the working medium may contain multiple types of refrigerant components.
  • the working medium may contain an ethylene-based fluoroolefin as a main refrigerant component and a compound other than the ethylene-based fluoroolefin as an auxiliary refrigerant component.
  • sub-refrigerant components include hydrofluorocarbons (HFC), hydrofluoroolefins (HFO), saturated hydrocarbons, carbon dioxide, and the like.
  • hydrofluorocarbons examples include difluoromethane, difluoroethane, trifluoroethane, tetrafluoroethane, pentafluoroethane, pentafluoropropane, hexafluoropropane, heptafluoropropane, pentafluorobutane, heptafluorocyclopentane, etc. It will be done.
  • hydrofluoroolefins examples include monofluoropropene, trifluoropropene, tetrafluoropropene, pentafluoropropene, hexafluorobutene, and the like.
  • saturated hydrocarbons examples include ethane, n-propane, cyclopropane, n-butane, cyclobutane, isobutane (2-methylpropane), methylcyclopropane, n-pentane, isopentane (2-methylbutane), neopentane (2, 2-dimethylpropane), methylcyclobutane, and the like.
  • the working medium may further contain a disproportionation inhibitor that suppresses the disproportionation reaction of the ethylene-based fluoroolefin.
  • disproportionation inhibitors include saturated hydrocarbons or haloalkanes.
  • saturated hydrocarbons include ethane, n-propane, cyclopropane, n-butane, cyclobutane, isobutane (2-methylpropane), methylcyclopropane, n-pentane, isopentane (2-methylbutane), neopentane (2, 2-dimethylpropane), methylcyclobutane, and the like.
  • n-propane is preferred.
  • haloalkanes examples include haloalkanes having 1 or 2 carbon atoms.
  • haloalkanes i.e., halomethanes
  • having one carbon number examples include (mono)iodomethane (CH 3 I), diiodomethane (CH 2 I 2 ), dibromomethane (CH 2 Br 2 ), bromomethane (CH 3 Br), and dichloromethane.
  • haloalkanes having two carbon atoms
  • haloalkanes having two carbon atoms
  • CF 3 CH 2 I 1,1,1-trifluoro-2-iodoethane
  • CH 3 CH 2 I monoiodoethane
  • CH 3 CH 2 Br monobromoethane
  • 1,1,1-triiodoethane CH 3 CI 3
  • the working medium may contain one or more haloalkanes having 1 or 2 carbon atoms. That is, only one type of haloalkane having 1 or 2 carbon atoms may be used, or two or more types may be used in an appropriate combination.
  • the refrigeration cycle circuit 2 in FIG. 1 includes a compressor 4, a first heat exchanger 5, an expansion valve 6, a second heat exchanger 7, and a four-way valve 8.
  • the refrigeration cycle device 1 in FIG. 1 includes an outdoor unit 1a and an indoor unit 1b.
  • the outdoor unit 1a includes a control device 3, a compressor 4, a first heat exchanger 5, an expansion valve 6, and a four-way valve 8.
  • the outdoor unit 1a further includes a first blower 5a for promoting heat exchange in the first heat exchanger 5.
  • the indoor unit 1b includes a second heat exchanger 7.
  • the indoor unit 1b further includes a second blower 7a for promoting heat exchange in the second heat exchanger 7.
  • the compressor 4 compresses the working medium and increases the pressure of the working medium.
  • the compressor 4 will be explained in detail later.
  • the first heat exchanger 5 and the second heat exchanger 7 exchange heat between the working medium circulating in the refrigeration cycle circuit 2 and external air (for example, outside air or indoor air).
  • the expansion valve 6 adjusts the pressure of the working medium (evaporation pressure) and the flow rate of the working medium.
  • the four-way valve 8 switches the direction of the working medium circulating through the refrigeration cycle circuit 2 between a first direction corresponding to cooling operation and a second direction corresponding to heating operation.
  • the first direction as shown by the solid arrow A1 in FIG. This is the direction in which the heat exchanger 7 is circulated in order.
  • the compressor 4 compresses and discharges the gaseous working medium, whereby the gaseous working medium is sent to the first heat exchanger 5 via the four-way valve 8.
  • the first heat exchanger 5 exchanges heat between the outside air and the gaseous working medium, and the gaseous working medium is condensed and liquefied.
  • the liquid working medium is depressurized by the expansion valve 6 and sent to the second heat exchanger 7.
  • heat is exchanged between the liquid working medium and the indoor air, and the gaseous working medium evaporates to become a gaseous working medium.
  • the gaseous working medium returns to the compressor 4 via a four-way valve 8 .
  • the first heat exchanger 5 functions as a condenser
  • the second heat exchanger 7 functions as an evaporator. Therefore, during cooling, the indoor unit 1b blows air cooled by heat exchange in the second heat exchanger 7 into the room.
  • the second direction as shown by the dashed arrow A2 in FIG. This is the direction in which the heat exchanger 5 is circulated in order.
  • the compressor 4 compresses and discharges the gaseous working medium, whereby the gaseous working medium is sent to the second heat exchanger 7 via the four-way valve 8.
  • the second heat exchanger 7 exchanges heat between the indoor air and the gaseous working medium, and the gaseous working medium is condensed and liquefied.
  • the liquid working medium is depressurized by the expansion valve 6 and sent to the first heat exchanger 5 .
  • heat is exchanged between the liquid working medium and the outside air, and the gaseous working medium evaporates to become a gaseous working medium.
  • the gaseous working medium returns to the compressor 4 via a four-way valve 8 .
  • the first heat exchanger 5 functions as an evaporator
  • the second heat exchanger 7 functions as a condenser. Therefore, during heating, the indoor unit 1b blows air warmed by heat exchange in the second heat exchanger 7 into the room.
  • FIG. 1 is a schematic diagram of a configuration example of the compressor 4 and the control device 3.
  • the compressor 4 is, for example, a hermetic compressor.
  • the compressor 4 may be of rotary type, scroll type, or other known type.
  • the compressor 4 in FIG. 2 includes a closed container 40, a compression mechanism 41, and an electric motor 42.
  • the closed container 40 constitutes a flow path for the working medium 20.
  • the closed container 40 has an intake pipe 401 and a discharge pipe 402.
  • the working medium 20 is sucked into the closed container 40 through the suction pipe 401, compressed by the compression mechanism 41, and then discharged out of the closed container 40 through the discharge pipe 402.
  • the inside of the closed container 40 is filled with high temperature and high pressure working medium 20 and lubricating oil.
  • the bottom of the closed container 40 constitutes an oil storage section that stores a mixed liquid of the working medium 20 and lubricating oil.
  • the compression mechanism 41 is located within the closed container 40 and compresses the working medium.
  • the compression mechanism 41 may have a conventionally known configuration.
  • the compression mechanism 41 includes, for example, a cylinder forming a compression chamber, a rolling piston disposed in the compression chamber within the cylinder, and a crankshaft coupled to the rolling piston.
  • the electric motor 42 is located inside the closed container 40 and operates the compression mechanism 41.
  • the electric motor 42 is, for example, a brushless motor (three-phase brushless motor).
  • the electric motor 42 includes, for example, a rotor fixed to the crankshaft of the compression mechanism 41 and a stator provided around the rotor.
  • the stator is, for example, configured by winding stator windings (magnet wire, etc.) around a stator core (magnetic steel plate, etc.) through insulating paper, either in concentrated or distributed manner.
  • the stator winding is covered with an insulating member.
  • the insulating member include polyethylene terephthalate (PET), polyethylene naphthalate (PEN), aramid polymer, polyphenylene sulfide (PPS), and the like.
  • the compressor 4 may include an accumulator to prevent liquid compression in the compression chamber of the compression mechanism 41.
  • the accumulator separates the working medium into a gaseous working medium and a liquid working medium, and guides only the gaseous working medium from the suction pipe 401 into the closed container 40 .
  • the control device 3 in FIG. 2 includes a drive circuit 31, a state detection circuit 32, a temperature measurement circuit 33, and a control circuit 34.
  • the drive circuit 31 drives the electric motor 42.
  • the drive circuit 31 in FIG. 2 supplies drive power to the electric motor 42 based on the power from the power source 10.
  • power supply 10 is an AC power supply.
  • Drive circuit 31 supplies drive power to electric motor 42 based on AC power from power supply 10 .
  • the drive circuit 31 supplies three-phase AC power to the electric motor 42 as drive power.
  • Drive circuit 31 includes a converter circuit 311 and an inverter circuit 312.
  • the converter circuit 311 converts AC power from the power supply 10 into DC power.
  • Converter circuit 311 includes a rectifier circuit 311a and a smoothing circuit 311b.
  • the rectifier circuit 311a is a diode bridge composed of a plurality of diodes D1 to D4.
  • the power supply 10 is connected between the input terminals of the rectifier circuit 311a (the connection point between diodes D1 and D2, and the connection point between diodes D3 and D4), and the output terminal of the rectification circuit 311a (the connection point between diodes D1 and D3, and
  • a smoothing circuit 311b is connected between the connection point of diodes D2 and D4.
  • the smoothing circuit 311b includes a series circuit of an inductor L1 and a capacitor C1, smoothes the voltage between the output terminals of the rectifier circuit 311a, and outputs the smoothed voltage as a voltage across the capacitor C1. Since the configurations of the rectifier circuit 311a and the smoothing circuit 311b in FIG. 2 are well known, detailed explanation thereof will be omitted.
  • the inverter circuit 312 supplies three-phase AC power to the motor 42 based on the DC power from the converter circuit 311.
  • the inverter circuit 312 includes a plurality of arms U1, U2, V1, V2, W1, and W2. Each of the plurality of arms U1, U2, V1, V2, W1, and W2 is composed of a semiconductor switching element such as a transistor.
  • the series circuit of arms U1 and U2 is connected in parallel to capacitor C1 of converter circuit 311, and constitutes a U-phase leg.
  • the series circuit of arms V1 and V2 is connected in parallel to capacitor C1 of converter circuit 311, and constitutes a V-phase leg.
  • the series circuit of arms W1 and W2 is connected in parallel to capacitor C1 of converter circuit 311, and constitutes a W-phase leg. Since the configuration of the inverter circuit 312 in FIG. 2 is well known, detailed explanation thereof will be omitted.
  • the state detection circuit 32 detects the state of the drive circuit 31.
  • the state of the drive circuit 31 is the current value of the current flowing through the drive circuit 31.
  • the current value of the current flowing through the drive circuit 31 includes the current value of the output alternating current of the U-phase and W-phase legs of the drive circuit 31.
  • the state detection circuit 32 in FIG. 2 includes a first alternating current sensor 32a and a second alternating current sensor 32b.
  • the first AC current sensor 32a detects the current value of the output AC current of the U-phase leg of the drive circuit 31, and outputs a first detection signal indicating the current value of the detected output AC current to the control circuit 34.
  • the second AC current sensor 32b detects the current value of the output AC current of the W-phase leg of the drive circuit 31, and outputs a second detection signal indicating the current value of the detected output AC current to the control circuit 34.
  • the temperature measurement circuit 33 measures the internal temperature of the airtight container 40 of the compressor 4.
  • the temperature measurement circuit 33 outputs a measurement signal indicating the measured internal temperature to the control circuit 34.
  • the temperature measurement circuit 33 is, for example, a temperature sensor located inside the closed container 40.
  • the temperature measurement circuit 33 is not limited to a temperature sensor located inside the closed container 40. The temperature measurement circuit 33 only needs to be able to directly or indirectly measure the internal temperature of the airtight container 40 of the compressor 4.
  • the control circuit 34 can be realized, for example, by a computer system including at least one or more processors (microprocessors) and one or more memories.
  • the control circuit 34 controls the drive circuit 31. More specifically, the control circuit 34 controls the plurality of arms of the inverter circuit 312 of the drive circuit 31 so that the inverter circuit 312 supplies three-phase AC power to the electric motor 42 based on the DC power from the smoothing circuit 311b. Controls switching of U1, U2, V1, V2, W1, and W2.
  • the control circuit 34 further suppresses the disproportionation reaction of the working medium circulating in the refrigeration cycle circuit 2 based on the first and second detection signals from the state detection circuit 32 and the measurement signal from the temperature measurement circuit 33. Execute the processing for
  • the factors for the disproportionation reaction of the working medium are thought to be heat and radicals. For example, when radicals are generated under high temperature and high pressure, it is thought that a disproportionation reaction of the working medium proceeds. Radicals may be generated, for example, by a discharge phenomenon that may occur when some abnormality occurs in the compressor 4 or the drive circuit 31. From this point of view, the control circuit 34 detects a state in which an abnormality in the drive circuit 31 is detected based on the state detected by the state detection circuit 32 and the internal temperature measured by the temperature measurement circuit 33 exceeds a predetermined temperature.
  • the drive circuit 31 is configured to stop its operation.
  • the control circuit 34 determines whether an abnormality has occurred in the drive circuit 31 based on the state of the drive circuit 31 detected by the state detection circuit 32.
  • the state of the drive circuit 31 is the current value of the current flowing through the drive circuit 31.
  • the current value of the current flowing through the drive circuit 31 includes the current value of the output alternating current of the U-phase and W-phase legs of the drive circuit 31.
  • the abnormality in the drive circuit 31 is a current abnormality in the drive circuit 31.
  • the current abnormality in the drive circuit 31 may include, for example, an abnormal increase in the DC component of the current flowing through the drive circuit 31.
  • Such an abnormal increase may occur in the refrigeration cycle device 1 due to, for example, a failure in the compressor 4 or a failure in the inverter circuit 312 (for example, a failure in any of the plurality of arms U1, U2, V1, V2, W1, W2). This can be caused by a malfunction. Therefore, if a current abnormality in the drive circuit 31 is detected, there is a possibility that a failure of the refrigeration cycle device 1, such as a failure of the compressor 4 or a failure of the inverter circuit 312, has occurred. However, a current abnormality in the drive circuit 31 may be detected due to some kind of noise or the like.
  • control circuit 34 compares the current value of the output AC current indicated by the first and second detection signals from the state detection circuit 32 with a predetermined current value.
  • the predetermined current value is appropriately set by analyzing the current waveform of the drive circuit 31 when an abnormality actually occurs in the drive circuit 31.
  • the predetermined current value is set to be larger than the current value of the current flowing through the drive circuit 31 when no abnormality has occurred in the drive circuit 31.
  • the control circuit 34 determines that a current abnormality in the drive circuit 31 has occurred. That is, the control circuit 34 detects a current abnormality in response to the fact that the current value of the current flowing through the drive circuit 31 detected by the state detection circuit 32 exceeds a predetermined current value. The control circuit 34 determines that a current abnormality in the drive circuit 31 has not occurred if both of the current values of the output alternating current indicated by the first and second detection signals are equal to or less than a predetermined current value.
  • the control circuit 34 determines that a current abnormality in the drive circuit 31 has occurred (that is, detects a current abnormality in the drive circuit 31), it stops the operation of the drive circuit 31.
  • the control circuit 34 detects a current abnormality in the drive circuit 31
  • the detection of an abnormality in the drive circuit 31 may be an erroneous detection due to noise or the like.
  • the control circuit 34 stops the operation of the drive circuit 31.
  • the control circuit 34 After stopping the operation of the drive circuit 31, the control circuit 34 compares the internal temperature indicated by the measurement signal from the temperature measurement circuit 33 with a predetermined temperature.
  • the predetermined temperature is, for example, lower than the safe temperature of the working medium and lower than the heat-resistant temperature of the insulating member of the electric motor 42 of the compressor 4.
  • the safe temperature of the working medium can be set based on the temperature at which a disproportionation reaction of the working medium may occur under the pressure conditions during normal operation of the refrigeration cycle device 1.
  • the safe temperature of the working medium is set at 150°C.
  • the heat-resistant temperature of the electric motor 42 of the compressor 4 is set based on the heat-resistant temperature of the insulating member of the electric motor 42 of the compressor 4, for example.
  • the heat resistant temperature of the insulating member of the electric motor 42 may be the heat resistant temperature of the insulating member having the lowest heat resistant temperature among the insulating members of the electric motor 42. If the operation of the refrigeration cycle device 1 is continued in a state where the internal temperature exceeds the allowable temperature limit, the insulating paper may break down, and at that time, there is a high possibility that a discharge phenomenon will occur.
  • the insulating member with the lowest allowable temperature limit in the electric motor 42 may be insulating paper between the stator core (magnetic steel plate or the like) and the stator winding (magnet wire or the like).
  • the heat resistance class of the insulating paper is, for example, class E specified in JIS C 4003, the heat resistance temperature is 120°C.
  • the predetermined temperature is set to a temperature lower than 120°C.
  • the safety margin is preferably set to about 5° C., for example. Therefore, the predetermined temperature may be set to 115°C. Since the safety margin depends on the distance between the temperature measurement circuit 33 and the stator or the motor efficiency, it is not limited to 5°C, but may be set to a value between 0 and 20°C.
  • the heat resistance class of insulating paper is not limited to class E, but may also be class B, class F, etc. If the heat resistance class is B class, the heat resistance temperature is 130°C. If the safe temperature of the working medium is 150°C, the predetermined temperature is set to a temperature lower than 130°C, for example 125°C. If the heat resistance class is F class, the heat resistance temperature is 155°C. If the safe temperature of the working medium is 150°C, the predetermined temperature is set to a temperature lower than 150°C, for example 145°C.
  • the control circuit 34 continues to stop the operation of the drive circuit 31 if the internal temperature indicated by the measurement signal from the temperature measurement circuit 33 exceeds a predetermined temperature. If there is an abnormality in the drive circuit 31 and the internal temperature exceeds a predetermined temperature, it is considered that there is a high possibility that a disproportionation reaction of the working medium will proceed. Therefore, the control circuit 34 keeps the operation of the drive circuit 31 stopped in order to suppress the disproportionation reaction of the working medium. In this way, the control circuit 34 detects an abnormality in the drive circuit 31 based on the state detected by the state detection circuit 32, and when the internal temperature measured by the temperature measurement circuit 33 exceeds a predetermined temperature, , the operation of the drive circuit 31 is stopped. In this case, the control circuit 34 outputs an error notification indicating that there is a possibility that a disproportionation reaction may occur.
  • the control circuit 34 restarts the operation of the drive circuit 31 if the internal temperature indicated by the measurement signal from the temperature measurement circuit 33 is below a predetermined temperature. Even if an abnormality in the drive circuit 31 is detected, as long as the internal temperature is below a predetermined temperature, it is considered that there is a low possibility that the disproportionation reaction of the working medium will proceed. Therefore, the control circuit 34 restarts the operation of the drive circuit 31.
  • the detection of an abnormality in the drive circuit 31 may be an erroneous detection due to noise or the like. However, if an abnormality in the drive circuit 31 is detected multiple times, there is a high possibility that an abnormality such as a failure of the refrigeration cycle device 1 has actually occurred. In this embodiment, the number of times an abnormality in the drive circuit 31 is detected is counted. The control circuit 34 compares the number of times an abnormality in the drive circuit 31 has been detected with a predetermined number of times corresponding to the abnormality in the drive circuit 31 . The control circuit 34 stops the operation of the drive circuit 31 when the number of detections exceeds a predetermined number. In this case, the control circuit 34 outputs an error notification indicating that there is a risk of an abnormality such as a failure of the refrigeration cycle device 1.
  • the control circuit 34 stops the operation of the drive circuit 31 at the time when a current abnormality in the drive circuit 31 is detected. Therefore, the control circuit 34 continues to stop the operation of the drive circuit 31 when the number of detections exceeds the predetermined number. The control circuit 34 restarts the operation of the drive circuit 31 when the number of detections is equal to or less than a predetermined number. However, if the internal temperature indicated by the measurement signal from the temperature measurement circuit 33 exceeds a predetermined temperature, the control circuit 34 continues to stop the operation of the drive circuit 31 even if the number of detections is less than or equal to the predetermined number of times.
  • FIG. 3 is a flowchart of an example of the operation of the control circuit 34 of the control device 3.
  • the control circuit 34 detects the state of the drive circuit 31 using the state detection circuit 32 (S11).
  • the state of the drive circuit 31 is the current value of the current flowing through the drive circuit 31.
  • the current value of the current flowing through the drive circuit 31 includes the current value of the output alternating current of the U-phase and W-phase legs of the drive circuit 31.
  • the control circuit 34 determines whether an abnormality has occurred in the drive circuit 31 based on the state detected by the state detection circuit 32 (S12). In this embodiment, the control circuit 34 compares the current value of the output AC current indicated by the first and second detection signals from the state detection circuit 32 with a predetermined current value.
  • control circuit 34 determines that a current abnormality in the drive circuit 31 has not occurred (S12; NO). .
  • the control circuit 34 determines that a current abnormality in the drive circuit 31 has occurred (S12; YES). The control circuit 34 stops the operation of the drive circuit 31 (S13).
  • control circuit 34 After stopping the operation of the drive circuit 31, the control circuit 34 compares the internal temperature indicated by the measurement signal from the temperature measurement circuit 33 with a predetermined temperature (S14).
  • the control circuit 34 If the internal temperature indicated by the measurement signal from the temperature measurement circuit 33 exceeds the predetermined temperature (S14; YES), the control circuit 34 continues to stop the operation of the drive circuit 31 (S15). Then, the control circuit 34 outputs an error notification indicating that there is a possibility that a disproportionation reaction may occur (S16).
  • step S14 if the internal temperature indicated by the measurement signal from the temperature measurement circuit 33 is equal to or lower than the predetermined temperature, the control circuit 34 increases the number of abnormality detections of the drive circuit 31 by 1 (S17).
  • the control circuit 34 compares the number of detected abnormalities in the drive circuit 31 with a predetermined number of times corresponding to the abnormality in the drive circuit 31 (S18).
  • the control circuit 34 When the number of detections exceeds a predetermined number (S18; YES), the control circuit 34 continues to stop the operation of the drive circuit 31 (S19). Then, the control circuit 34 outputs an error notification indicating that there is a possibility of an abnormality such as a failure of the refrigeration cycle device 1 (S20).
  • step S18 if the number of detections is less than or equal to the predetermined number (S18; NO), the control circuit 34 restarts the operation of the drive circuit 31 (S21).
  • the control circuit 34 detects an abnormality in the drive circuit 31 based on the state detected by the state detection circuit 32 and when the internal temperature measured by the temperature measurement circuit 33 exceeds a predetermined temperature. , the operation of the drive circuit 31 is stopped. In particular, the control circuit 34 stops the operation of the drive circuit 31 when an abnormality is detected, and continues to stop the operation of the drive circuit 31 when the internal temperature measured by the temperature measurement circuit 33 exceeds a predetermined temperature. In this way, the control circuit 34 can suppress the discharge phenomenon that can generate radicals that cause the disproportionation reaction of the working medium, and as a result, the disproportionation reaction of the working medium can be suppressed.
  • the refrigeration cycle device 1 described above includes a compressor 4, a condenser (first heat exchanger 5, second heat exchanger 7), an expansion valve 6, and an evaporator (first heat exchanger 5, second heat exchanger 7). 7), a refrigeration cycle circuit 2 in which a working medium 20 circulates, and a control device 3 that controls a compressor 4 of the refrigeration cycle circuit 2.
  • the working medium 20 contains ethylene-based fluoroolefin as a refrigerant component.
  • the compressor 4 includes an airtight container 40 that forms a flow path for the working medium 20, a compression mechanism 41 that is located inside the airtight container 40 and compresses the working medium 20, and a compression mechanism 41 that is located inside the airtight container 40 and compresses the compression mechanism 41.
  • the control device 3 includes a drive circuit 31 that drives the electric motor 42, a state detection circuit 32 that detects the state of the drive circuit 31, a temperature measurement circuit 33 that measures the internal temperature of the airtight container 40 of the compressor 4, and a drive circuit. and a control circuit 34 for controlling 31.
  • the control circuit 34 controls the drive circuit 31 when an abnormality in the drive circuit 31 is detected based on the state detected by the state detection circuit 32 and the internal temperature measured by the temperature measurement circuit 33 exceeds a predetermined temperature. Stop the operation. This configuration makes it possible to suppress disproportionation reactions of the working medium.
  • the control circuit 34 stops the operation of the drive circuit 31 when an abnormality is detected, and checks whether the internal temperature measured by the temperature measurement circuit 33 exceeds a predetermined temperature after the operation of the drive circuit 31 stops. is determined, and if the internal temperature measured by the temperature measurement circuit 33 exceeds a predetermined temperature, the operation of the drive circuit 31 is continued to be stopped, and if the internal temperature measured by the temperature measurement circuit 33 is below the predetermined temperature. If so, the operation of the drive circuit 31 is restarted.
  • This configuration can enhance the effect of suppressing the disproportionation reaction of the working medium.
  • the control circuit 34 counts the number of abnormality detections, and stops the operation of the drive circuit 31 when the number of detections exceeds a predetermined number of times corresponding to the abnormality. This configuration can improve the safety of the operation of the refrigeration cycle device 1.
  • the state includes the current value of the current flowing through the drive circuit 31 (the current value of the output AC current of the U-phase and W-phase legs of the drive circuit 31).
  • the abnormality includes a current abnormality in the drive circuit 31.
  • the control circuit 34 detects a current abnormality in response to the fact that the current value of the current flowing through the drive circuit 31 detected by the state detection circuit 32 exceeds a predetermined current value. This configuration makes it possible to suppress a disproportionation reaction of the working medium caused by an abnormality in the drive circuit 31.
  • the predetermined temperature is lower than the safe temperature of the working medium 20 and lower than the heat-resistant temperature of the electric motor 42 of the compressor 4. This configuration makes it possible to suppress disproportionation reactions of the working medium.
  • the ethylene-based fluoroolefins include ethylene-based fluoroolefins in which a disproportionation reaction occurs. This configuration makes it possible to suppress disproportionation reactions of the working medium.
  • the ethylene-based fluoroolefins include 1,1,2-trifluoroethylene, trans-1,2-difluoroethylene, cis-1,2-difluoroethylene, 1,1-difluoroethylene, and tetrafluoroethylene. , or monofluoroethylene. This configuration makes it possible to suppress disproportionation reactions of the working medium.
  • the working medium 20 further includes difluoromethane as a refrigerant component. This configuration makes it possible to suppress disproportionation reactions of the working medium.
  • the working medium 20 further contains saturated hydrocarbons. This configuration makes it possible to suppress disproportionation reactions of the working medium.
  • the working medium 20 contains a haloalkane having 1 or 2 carbon atoms as a disproportionation inhibitor that suppresses the disproportionation reaction of ethylene-based fluoroolefins. This configuration makes it possible to suppress disproportionation reactions of the working medium.
  • the saturated hydrocarbons include n-propane. This configuration makes it possible to suppress disproportionation reactions of the working medium.
  • Embodiments of the present disclosure are not limited to the above embodiments.
  • the embodiments described above can be modified in various ways depending on the design, etc., as long as the objects of the present disclosure can be achieved. Modifications of the above embodiment are listed below.
  • the modified examples described below can be applied in combination as appropriate.
  • FIG. 4 is a schematic diagram of a configuration example of the compressor 4 and the control device 3A of the refrigeration cycle device of Modification 1.
  • the control device 3A in FIG. 4 includes a drive circuit 31, a state detection circuit 32A, a temperature measurement circuit 33, and a control circuit 34A.
  • the state detection circuit 32A detects the state of the drive circuit 31.
  • the state of the drive circuit 31 is the current value of the current flowing through the drive circuit 31.
  • the current value of the current flowing through the drive circuit 31 includes the current value of the DC current flowing between the converter circuit 311 and the inverter circuit 312 of the drive circuit 31.
  • the state detection circuit 32A in FIG. 4 is, for example, a shunt resistor connected between the connection point between the diode D4 and the capacitor C1 in the converter circuit 311 and the connection point between the legs U2, V2, and W2 in the inverter circuit 312. .
  • the voltage across the state detection circuit 32A indicates the current value of the DC current flowing between the converter circuit 311 and the inverter circuit 312 of the drive circuit 31.
  • the control circuit 34A determines whether an abnormality has occurred in the drive circuit 31 based on the state of the drive circuit 31 detected by the state detection circuit 32A.
  • the state of the drive circuit 31 is the current value of the current flowing through the drive circuit 31.
  • the current value of the current flowing through the drive circuit 31 includes the current value of the DC current flowing between the converter circuit 311 and the inverter circuit 312 of the drive circuit 31.
  • the abnormality in the drive circuit 31 is a current abnormality in the drive circuit 31.
  • the current abnormality in the drive circuit 31 may include, for example, an abnormal increase in the DC component of the current flowing through the drive circuit 31.
  • Such an abnormal increase may occur in the refrigeration cycle device 1 due to, for example, a failure in the compressor 4 or a failure in the inverter circuit 312 (for example, a failure in any of the plurality of arms U1, U2, V1, V2, W1, W2). This can be caused by a malfunction. Therefore, if a current abnormality in the drive circuit 31 is detected, there is a possibility that a failure of the refrigeration cycle device 1, such as a failure of the compressor 4 or a failure of the inverter circuit 312, has occurred. However, a current abnormality in the drive circuit 31 may be detected due to some kind of noise or the like.
  • the control circuit 34A compares the current value of the DC current flowing between the converter circuit 311 and the inverter circuit 312 of the drive circuit 31 obtained from the voltage across the state detection circuit 32A with a predetermined current value.
  • the predetermined current value is appropriately set by analyzing the current waveform of the drive circuit 31 when an abnormality actually occurs in the drive circuit 31.
  • the predetermined current value is set to be larger than the current value of the current flowing through the drive circuit 31 when no abnormality has occurred in the drive circuit 31.
  • the control circuit 34A determines that a current abnormality in the drive circuit 31 has occurred if the current value of the DC current flowing between the converter circuit 311 and the inverter circuit 312 of the drive circuit 31 exceeds a predetermined current value. . That is, the control circuit 34A detects a current abnormality in response to the fact that the current value of the DC current flowing between the converter circuit 311 and the inverter circuit 312 of the drive circuit 31 exceeds a predetermined current value. The control circuit 34A determines that a current abnormality in the drive circuit 31 has not occurred if the current value of the DC current flowing between the converter circuit 311 and the inverter circuit 312 of the drive circuit 31 is equal to or less than a predetermined current value.
  • the control circuit 34A detects an abnormality in the drive circuit 31 (current abnormality in the drive circuit 31) based on the state detected by the state detection circuit 32A, and when the internal temperature measured by the temperature measurement circuit 33 exceeds a predetermined temperature. In this state, the operation of the drive circuit 31 is stopped. In particular, the control circuit 34A stops the operation of the drive circuit 31 when an abnormality is detected, and continues to stop the operation of the drive circuit 31 when the internal temperature measured by the temperature measurement circuit 33 exceeds a predetermined temperature. In this way, the control circuit 34A can suppress the discharge phenomenon that can generate radicals that cause the disproportionation reaction of the working medium, and as a result, the disproportionation reaction of the working medium can be suppressed.
  • the control device 3A includes the drive circuit 31 that drives the electric motor 42, the state detection circuit 32A that detects the state of the drive circuit 31, and the inside of the airtight container 40 of the compressor 4. It has a temperature measurement circuit 33 that measures temperature and a control circuit 34A that controls the drive circuit 31.
  • the control circuit 34A controls the drive circuit 31 when an abnormality in the drive circuit 31 is detected based on the state detected by the state detection circuit 32A and the internal temperature measured by the temperature measurement circuit 33 exceeds a predetermined temperature. Stop the operation. This configuration makes it possible to suppress disproportionation reactions of the working medium.
  • the state includes the current value of the current flowing through the drive circuit 31.
  • the abnormality includes a current abnormality in the drive circuit 31.
  • the control circuit 34A detects a current abnormality in response to the fact that the current value of the current flowing through the drive circuit 31 detected by the state detection circuit 32A exceeds a predetermined current value. This configuration makes it possible to suppress a disproportionation reaction of the working medium caused by an abnormality in the drive circuit 31.
  • FIG. 5 is a schematic diagram of a configuration example of the compressor 4 and the control device 3B of the refrigeration cycle device of Modification 2.
  • the control device 3B in FIG. 5 includes a drive circuit 31, a state detection circuit 32B, a temperature measurement circuit 33, and a control circuit 34B.
  • the state detection circuit 32B detects the state of the compressor 4.
  • the state of the compressor 4 is the current value of the phase current of the compressor 4.
  • the current value of the phase current of the compressor 4 includes the current value of each of the U-phase, V-phase, and W-phase currents.
  • the state detection circuit 32B in FIG. 5 includes a U-phase shunt resistor Ru, a V-phase shunt resistor Rv, and a W-phase shunt resistor Rw.
  • the U-phase shunt resistor Ru is inserted between the U-phase arm of the inverter circuit 312 and the U-phase stator winding of the motor 42 of the compressor 4.
  • the V-phase shunt resistor Rv is inserted between the V-phase arm of the inverter circuit 312 and the V-phase stator winding of the electric motor 42 of the compressor 4.
  • the W-phase shunt resistor Rw is inserted between the W-phase arm of the inverter circuit 312 and the W-phase stator winding of the motor 42 of the compressor 4.
  • the voltages across each of the shunt resistors Ru, Rv, and Rw of the state detection circuit 32B indicate the current values of the U-phase, V-phase, and W-phase currents.
  • the control circuit 34B determines whether an abnormality has occurred in the compressor 4 based on the state of the compressor 4 detected by the state detection circuit 32B.
  • the abnormality of the compressor 4 includes an abnormality related to a layer short of the compressor 4.
  • Abnormalities related to layer shorts in the compressor 4 include layer shorts in the compressor 4 itself, abnormalities that may cause layer shorts in the compressor 4, and abnormalities that may be caused by layer shorts in the compressor 4. may include.
  • Specific examples of abnormalities related to layer shorts in the compressor 4 include layer shorts in the compressor 4, electrical leakage in the compressor 4, open-phase operation in the compressor 4, and the like. If there is an imbalance in the phase currents of the compressor 4, there is a possibility that an abnormality related to a layer short in the compressor 4 has occurred.
  • the control circuit 34B determines whether an imbalance in the phase currents of the compressor 4 has occurred based on the current value of the phase currents of the compressor 4 obtained from the state detection circuit 32B. Unless the U-phase, V-phase, and W-phase currents of the compressor 4 have equal amplitudes and are out of phase by 120 degrees, an imbalance in the phase currents of the compressor 4 has occurred.
  • the control circuit 34B determines that an abnormality related to a layer short in the compressor 4 has occurred. That is, the control circuit 34B detects an abnormality related to a layer short in the compressor 4 in response to an imbalance in the phase currents of the compressor 4. If the phase current imbalance of the compressor 4 has not occurred, the control circuit 34B determines that an abnormality related to the layer short circuit of the compressor 4 has not occurred.
  • the control circuit 34B detects an abnormality in the compressor 4 (an abnormality related to a layer short in the compressor 4) based on the state detected by the state detection circuit 32B, and adjusts the internal temperature measured by the temperature measurement circuit 33 to a predetermined value. When the temperature exceeds the temperature, the operation of the drive circuit 31 is stopped. In particular, the control circuit 34B stops the operation of the drive circuit 31 when an abnormality is detected, and continues to stop the operation of the drive circuit 31 when the internal temperature measured by the temperature measurement circuit 33 exceeds a predetermined temperature. In this way, the control circuit 34B can suppress the discharge phenomenon that can generate radicals that cause the disproportionation reaction of the working medium, and as a result, the disproportionation reaction of the working medium can be suppressed.
  • the control device 3B includes the drive circuit 31 that drives the electric motor 42, the state detection circuit 32B that detects the state of the compressor 4, and the internal temperature of the airtight container 40 of the compressor 4. It has a temperature measurement circuit 33 that measures temperature, and a control circuit 34B that controls the drive circuit 31.
  • the control circuit 34B controls the drive circuit 31 when an abnormality in the compressor 4 is detected based on the state detected by the state detection circuit 32B and the internal temperature measured by the temperature measurement circuit 33 exceeds a predetermined temperature. Stop the operation. This configuration makes it possible to suppress disproportionation reactions of the working medium.
  • the state includes the current value of the phase current of the compressor 4.
  • the abnormality includes an abnormality related to a layer short in the compressor 4.
  • the control circuit 34B detects an abnormality related to a layer short in the compressor 4 in response to a phase current imbalance in the compressor 4. This configuration makes it possible to suppress a disproportionation reaction of the working medium caused by an abnormality in the compressor 4.
  • FIG. 6 is a schematic diagram of a configuration example of the compressor 4 and the control device 3C of the refrigeration cycle device of Modification 3.
  • the control device 3C in FIG. 6 includes a drive circuit 31, a state detection circuit 32C, a temperature measurement circuit 33, and a control circuit 34C.
  • the state detection circuit 32C detects the state of the compressor 4.
  • the state of the compressor 4 is the rotation speed of the electric motor 42 of the compressor 4.
  • the state detection circuit 32C in FIG. 6 includes a rotation speed sensor that measures the rotation speed of the electric motor 42 of the compressor 4.
  • the rotation speed sensor may be a well-known configuration such as an electromagnetic pickup, a proximity sensor, a photoelectric sensor, a laser sensor, or the like.
  • the control circuit 34C determines whether an abnormality has occurred in the compressor 4 based on the state of the compressor 4 detected by the state detection circuit 32C.
  • the abnormality of the compressor 4 includes an abnormality related to a layer short of the compressor 4.
  • Abnormalities related to layer shorts in the compressor 4 include layer shorts in the compressor 4 itself, abnormalities that may cause layer shorts in the compressor 4, and abnormalities that may be caused by layer shorts in the compressor 4. may include.
  • Specific examples of abnormalities related to layer shorts in the compressor 4 include layer shorts in the compressor 4, electrical leakage in the compressor 4, open-phase operation in the compressor 4, and the like. If there is a deviation in the rotational speed of the electric motor 42 of the compressor 4, there is a possibility that an abnormality related to a layer short in the compressor 4 has occurred.
  • the control circuit 34C determines whether a deviation in the rotation speed of the electric motor 42 of the compressor 4 has occurred based on the rotation speed of the electric motor 42 of the compressor 4 obtained from the state detection circuit 32C.
  • the control circuit 34C adjusts the operating frequency ( switching frequency). If no abnormality occurs in the compressor 4, the rotation speed of the electric motor 42 of the compressor 4 detected by the state detection circuit 32C is within a predetermined range based on the target rotation speed. If the rotation speed of the electric motor 42 of the compressor 4 detected by the state detection circuit 32C is not within a predetermined range, the control circuit 34C determines that a deviation in the rotation speed of the electric motor 42 of the compressor 4 has occurred. It is determined that
  • the control circuit 34C determines that an abnormality related to a layer short in the compressor 4 has occurred. That is, the control circuit 34C detects an abnormality related to a layer short in the compressor 4 in response to a deviation in the rotation speed of the electric motor 42 of the compressor 4. The control circuit 34C determines that an abnormality related to a layer short in the compressor 4 has not occurred if a deviation in the rotational speed of the electric motor 42 of the compressor 4 has not occurred.
  • the control circuit 34C detects an abnormality in the compressor 4 (an abnormality related to a layer short in the compressor 4) based on the state detected by the state detection circuit 32C, and adjusts the internal temperature measured by the temperature measurement circuit 33 to a predetermined value. When the temperature exceeds the temperature, the operation of the drive circuit 31 is stopped. In particular, the control circuit 34C stops the operation of the drive circuit 31 when an abnormality is detected, and continues to stop the operation of the drive circuit 31 when the internal temperature measured by the temperature measurement circuit 33 exceeds a predetermined temperature. In this way, the control circuit 34C can suppress the discharge phenomenon that can generate radicals that cause the disproportionation reaction of the working medium, and as a result, the disproportionation reaction of the working medium can be suppressed.
  • the control device 3C described above includes a drive circuit 31 that drives the electric motor 42, a state detection circuit 32C that detects the state of the compressor 4, and a temperature measurement circuit 33 that measures the internal temperature of the airtight container 40 of the compressor 4. , and a control circuit 34C that controls the drive circuit 31.
  • the control circuit 34C controls the drive circuit 31 when an abnormality in the compressor 4 is detected based on the state detected by the state detection circuit 32C and the internal temperature measured by the temperature measurement circuit 33 exceeds a predetermined temperature. Stop the operation. This configuration makes it possible to suppress disproportionation reactions of the working medium.
  • the state includes the rotation speed of the electric motor 42 of the compressor 4.
  • the abnormality includes an abnormality related to a layer short in the compressor 4.
  • the control circuit 34C detects an abnormality related to a layer short in the compressor 4 in response to a deviation in the rotational speed of the electric motor 42 of the compressor 4. This configuration makes it possible to suppress a disproportionation reaction of the working medium caused by an abnormality in the compressor 4.
  • the state detection circuits 32, 32A, 32B, and 32C may be changed as appropriate.
  • the current value of the current flowing through the drive circuit 31 detected by the state detection circuit 32 is not limited to the current value of the output alternating current of the U-phase and W-phase legs of the drive circuit 31.
  • the current value of the current flowing through the drive circuit 31 detected by the state detection circuit 32 may include at least one of the current values of the output alternating currents of the U-phase, V-phase, and W-phase legs of the drive circuit 31.
  • the state detection circuit 32A may be a shunt resistor connected between the connection point between the inductor L1 and the capacitor C1 in the converter circuit 311 and the connection point between the legs U1, V1, and W1 in the inverter circuit 312. .
  • the state detection circuit 32A is not limited to a shunt resistor.
  • the state detection circuit 32A may be a well-known DC current sensor.
  • the state detection circuit 32B is not limited to a shunt resistor.
  • the state detection circuit 32B may be a well-known alternating current sensor.
  • the refrigeration cycle device may include at least one of the state detection circuits 32 and 32A and at least one of the state detection circuits 32B and 32C. That is, the refrigeration cycle device may detect both an abnormality in the compressor 4 and an abnormality in the drive circuit 31. The number of abnormality detections may be counted for each state detection circuit.
  • control circuits 34, 34A, 34B, and 34C do not necessarily have to stop the operation of the drive circuit 31 when an abnormality is detected.
  • the control circuits 34, 34A, 34B, and 34C may stop the operation of the drive circuit 31 when an abnormality is detected and the internal temperature measured by the temperature measurement circuit 33 exceeds a predetermined temperature.
  • control circuits 34, 34A, 34B, and 34C do not necessarily need to count the number of abnormality detections.
  • control circuits 34, 34A, 34B, and 34C stop the operation of the drive circuit 31 only while the internal temperature measured by the temperature measurement circuit 33 exceeds a predetermined temperature. It's fine.
  • the refrigeration cycle device is not limited to an air conditioner (so-called room air conditioner (RAC)) configured in which one indoor unit is connected to one outdoor unit.
  • the refrigeration cycle device may be an air conditioner (so-called package air conditioner (PAC), building multi-air conditioner (VRF)) in which a plurality of indoor units are connected to one or more outdoor units.
  • the refrigeration cycle device is not limited to an air conditioner, but may be a freezing or refrigeration device such as a refrigerator or a freezer.
  • the first aspect is a refrigeration cycle device (1), which includes a compressor (4), a condenser (first heat exchanger 5, second heat exchanger 7), an expansion valve (6), and an evaporator (second heat exchanger 7).
  • a refrigeration cycle circuit (2) in which a working medium (20) circulates, and control for controlling the compressor (4) of the refrigeration cycle circuit (2).
  • a device (3; 3A; 3B; 3C) is provided.
  • the working medium (20) contains ethylene-based fluoroolefin as a refrigerant component.
  • the compressor (4) includes a closed container (40) that constitutes a flow path for the working medium (20), and a compression mechanism (located in the closed container (40) that compresses the working medium (20).
  • the control device (3; 3A; 3B; 3C) detects the state of a drive circuit (31) that drives the electric motor (42), and at least one of the compressor (4) and the drive circuit (31). control the state detection circuit (32; 32A; 32B; 32C), the temperature measurement circuit (33) that measures the internal temperature of the airtight container (40) of the compressor (4), and the drive circuit (31). control circuits (34; 34A; 34B; 34C).
  • the control circuit (34; 34A; 34B; 34C) controls the compressor (4) and the drive circuit (31) based on the state detected by the state detection circuit (32; 32A; 32B; 32C). If an abnormality in at least one of the above is detected and the internal temperature measured by the temperature measurement circuit (33) exceeds a predetermined temperature, the operation of the drive circuit (31) is stopped.
  • This embodiment makes it possible to suppress disproportionation reactions of the working medium.
  • the second aspect is a refrigeration cycle device (1) based on the first aspect.
  • the control circuit (34; 34A; 34B; 34C) stops the operation of the drive circuit (31) when detecting the abnormality, and after stopping the operation of the drive circuit (31), the control circuit (34; 34A; 34B; 34C) It is determined whether the internal temperature measured by the measurement circuit (33) exceeds the predetermined temperature, and if the internal temperature measured by the temperature measurement circuit (33) exceeds the predetermined temperature, the The operation of the drive circuit (31) is continued to be stopped, and if the internal temperature measured by the temperature measurement circuit (33) is below the predetermined temperature, the operation of the drive circuit (31) is restarted.
  • This embodiment can enhance the effect of suppressing the disproportionation reaction of the working medium.
  • the third aspect is a refrigeration cycle device (1) based on the second aspect.
  • the control circuit (34; 34A; 34B; 34C) counts the number of times the abnormality is detected, and when the number of detections exceeds a predetermined number corresponding to the abnormality, the control circuit (34; 34A; 34B; 34C) controls the drive circuit (31). Stop the operation. This aspect can improve the safety of operation of the refrigeration cycle device (1).
  • a fourth aspect is a refrigeration cycle device (1) based on any one of the first to third aspects.
  • the state includes a current value of a current flowing through the drive circuit (31).
  • the abnormality includes a current abnormality in the drive circuit (31).
  • the control circuit (34; 34A) in response to the current value of the current flowing through the drive circuit (31) detected by the state detection circuit (32; 32A) exceeding a predetermined current value, Detecting the current abnormality. This aspect makes it possible to suppress a disproportionation reaction of the working medium caused by an abnormality in the drive circuit (31).
  • a fifth aspect is a refrigeration cycle device (1) based on any one of the first to fourth aspects.
  • the state includes at least one of a current value of a phase current of the compressor (4) and a rotation speed of the electric motor (42) of the compressor (4).
  • the abnormality includes an abnormality related to a layer short of the compressor (4).
  • the control circuit (34B; 34C) responds to at least one of an imbalance in the phase currents of the compressor (4) and a deviation in the rotational speed of the electric motor (42) of the compressor (4). An abnormality related to a layer short in the compressor (4) is detected. This aspect makes it possible to suppress disproportionation reactions of the working medium due to abnormalities in the compressor (4).
  • a sixth aspect is a refrigeration cycle device (1) based on any one of the first to fifth aspects.
  • the predetermined temperature is lower than the safe temperature of the working medium (20) and lower than the heat-resistant temperature of the electric motor (42) of the compressor (4). This embodiment makes it possible to suppress disproportionation reactions of the working medium.
  • a seventh aspect is a refrigeration cycle device (1) based on any one of the first to sixth aspects.
  • the ethylene-based fluoroolefin includes an ethylene-based fluoroolefin in which a disproportionation reaction occurs. This embodiment makes it possible to suppress disproportionation reactions of the working medium.
  • the eighth aspect is a refrigeration cycle device (1) based on any one of the first to seventh aspects.
  • the ethylene fluoroolefin is 1,1,2-trifluoroethylene, trans-1,2-difluoroethylene, cis-1,2-difluoroethylene, 1,1-difluoroethylene, tetrafluoroethylene, Ethylene or monofluoroethylene. This embodiment makes it possible to suppress disproportionation reactions of the working medium.
  • a ninth aspect is a refrigeration cycle device (1) based on any one of the first to eighth aspects.
  • the working medium (20) further includes difluoromethane as the refrigerant component. This embodiment makes it possible to suppress disproportionation reactions of the working medium.
  • a tenth aspect is a refrigeration cycle device (1) based on any one of the first to ninth aspects.
  • the working medium (20) further comprises a saturated hydrocarbon. This embodiment makes it possible to suppress disproportionation reactions of the working medium.
  • the eleventh aspect is a refrigeration cycle device (1) based on the tenth aspect.
  • the working medium (20) contains a haloalkane having 1 or 2 carbon atoms as a disproportionation inhibitor that suppresses the disproportionation reaction of the ethylene-based fluoroolefin. This embodiment makes it possible to suppress disproportionation reactions of the working medium.
  • a twelfth aspect is a refrigeration cycle device (1) based on the tenth aspect.
  • the saturated hydrocarbon comprises n-propane. This embodiment makes it possible to suppress disproportionation reactions of the working medium.
  • the second to twelfth aspects are optional elements and are not essential.
  • the present disclosure is applicable to refrigeration cycle devices. Specifically, the present disclosure is applicable to a refrigeration cycle device in which the working medium contains an ethylene-based fluoroolefin as a refrigerant component.
  • Refrigeration cycle device 1 Refrigeration cycle device 2 Refrigeration cycle circuit 20 Working medium 3, 3A, 3B, 3C Control device 31 Drive circuit 32, 32A, 32B, 32C State detection circuit 33 Temperature measurement circuit 34, 34A, 34B, 34C Control circuit 4 Compressor 40 Closed container 41 Compression mechanism 42 Electric motor 5 First heat exchanger (condenser, evaporator) 6 Expansion valve 7 Second heat exchanger (condenser, evaporator)

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
PCT/JP2023/015491 2022-04-28 2023-04-18 冷凍サイクル装置 Ceased WO2023210446A1 (ja)

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EP23796189.1A EP4517224A4 (en) 2022-04-28 2023-04-18 Refrigeration cycle device
JP2024517224A JPWO2023210446A1 (https=) 2022-04-28 2023-04-18
US18/860,407 US20250290678A1 (en) 2022-04-28 2023-04-18 Refrigeration cycle device

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US20250290678A1 (en) 2025-09-18
EP4517224A1 (en) 2025-03-05

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