US20250290678A1 - Refrigeration cycle device - Google Patents

Refrigeration cycle device

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Publication number
US20250290678A1
US20250290678A1 US18/860,407 US202318860407A US2025290678A1 US 20250290678 A1 US20250290678 A1 US 20250290678A1 US 202318860407 A US202318860407 A US 202318860407A US 2025290678 A1 US2025290678 A1 US 2025290678A1
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United States
Prior art keywords
circuit
compressor
drive circuit
abnormality
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.)
Pending
Application number
US18/860,407
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English (en)
Inventor
Akira Hiwata
Yoshiaki Doyama
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Panasonic Intellectual Property Management Co Ltd
Original Assignee
Panasonic Intellectual Property Management Co Ltd
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Filing date
Publication date
Application filed by Panasonic Intellectual Property Management Co Ltd filed Critical Panasonic Intellectual Property Management Co Ltd
Assigned to PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD. reassignment PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HIWATA, AKIRA, DOYAMA, YOSHIAKI
Publication of US20250290678A1 publication Critical patent/US20250290678A1/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/005—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.
  • the global warming potential (GWP) of R410A is as high as 2090. Therefore, from the viewpoint of preventing global warming, research and development of working media with smaller GWPs has been conducted.
  • Patent Document 1 discloses 1,1,2-trifluoroethylene (HFO1123) as a working medium with a smaller GWP than R410A.
  • Patent Document 2 discloses 1,2-difluoroethylene (HFO1132) as a working medium with a smaller GWP than R410A.
  • Patent Document 1 WO 2012/157764 A1
  • Patent Document 2 WO 2012/157765 A1
  • HFO1123 and HFO1132 have a smaller GWP than R410A, but are therefore less stable than R410A.
  • the generation of radicals may cause a disproportionation reaction of HFO1123 or HFO1132, resulting in the conversion of HFO1123 and HFO1132 to other compounds.
  • the present disclosure provides a refrigeration cycle device enabling suppression of a disproportionation reaction of a working medium.
  • a refrigeration cycle device includes: a refrigeration cycle circuit including a compressor, a condenser, an expansion valve and an evaporator, and allowing circulation of a working medium; and a control device configured to control the compressor of the refrigeration cycle circuit.
  • the working medium contains ethylene-based fluoroolefin as a refrigerant component.
  • the compressor includes: a sealed container constituting a fluidic pathway for the working medium; a compression mechanism positioned inside the sealed container to compress the working medium; and an electric motor positioned inside the sealed container to operate the compression mechanism.
  • the control device includes: a drive circuit configured to drive the electric motor; a state detection circuit configured to detect a state of at least one of the compressor or the drive circuit; a temperature measurement circuit configured to measure an internal temperature of the sealed container of the compressor; and a control circuit configured to control the drive circuit.
  • the control circuit is configured to stop operation of the drive circuit during a state where an abnormality of at least one of the compressor or the drive circuit has been detected based on the state detected by the state detection circuit and the internal temperature measured by the temperature measurement circuit has exceeded a predetermined temperature.
  • the present aspect enables suppression of a disproportionation reaction of a working medium.
  • FIG. 1 is a block diagram of a configuration example of a refrigeration cycle device in accordance with one embodiment.
  • FIG. 2 is a schematic diagram of configuration examples of a compressor and a control device of the refrigeration cycle device of FIG. 1 .
  • FIG. 3 is a flow chart of one example of operation of a control circuit of the control device of FIG. 2 .
  • FIG. 4 is a schematic diagram of configuration examples of a compressor and a control device of a refrigeration cycle device of variation 1.
  • FIG. 5 is a schematic diagram of configuration examples of a compressor and a control device of a refrigeration cycle device of variation 2.
  • FIG. 6 is a schematic diagram of configuration examples of a compressor and a control device of a refrigeration cycle device of variation 3.
  • prefixes such as, “first”, “second”, or the like are attached to names of such components.
  • prefixes such as, “first”, “second”, or the like, may be omitted in consideration of readability of texts.
  • saturated hydrocarbons may include ethane, n-propane, cyclopropane, n-butane, cyclobutane, isobutane (2-methylpropane), methylcyclopropane, n-pentane, isopentane (2-methylbutane), neopentane (2,2-dimethylpropane), and methylcyclobutane.
  • the compressor 4 compresses the working medium to increase a pressure of the working medium.
  • the compressor 4 would be described in detail later.
  • the first heat exchanger 5 and the second heat exchanger 7 enable heat exchange between the working medium circulating in the refrigerator cycle circuit 2 and external air (e.g., the outdoor air or the indoor air).
  • the expansion valve 6 regulates the pressure (evaporation pressure) of the working medium and regulates a flow volume of the working medium.
  • the four-way valve 8 switches a direction of the working medium circulating in the refrigerator cycle circuit 2 between a first direction corresponding to the cooling operation and a second direction corresponding to the heating operation.
  • the first direction is a direction in which the working medium circulates in the refrigerator cycle circuit 2 in the order of the compressor 4 , the first heat exchanger 5 , the expansion valve 6 , and the second heat exchanger 7 .
  • the compressor 4 compresses and discharges the gaseous working medium, and thus the gaseous working medium is sent to the first heat exchanger 5 through the four-way valve 8 .
  • the first heat exchanger 5 conducts heat exchange between the outdoor air and the gaseous working medium and then the gaseous working medium is condensed to be liquefied.
  • the liquid working medium is decompressed by the expansion valve 6 and is sent to the second heat exchanger 7 .
  • the second heat exchanger 7 conducts heat exchange between the liquid working medium and the indoor air, and then the gaseous working medium evaporates to become the gaseous working medium.
  • the gaseous working medium returns to the compressor 4 through the four-way valve 8 .
  • the first heat exchanger 5 functions as a condenser
  • the second heat exchanger 7 functions as an evaporator.
  • the indoor unit 1 b sends air cooled via heat exchange at the second heat exchanger 7 to an interior during cooling.
  • the second direction is a direction in which the working medium circulates in the refrigerator cycle circuit 2 in the order of the compressor 4 , the second heat exchanger 7 , the expansion valve 6 , and the first heat exchanger 5 .
  • the compressor 4 compresses and discharges the gaseous working medium, and thus the gaseous working medium is sent to the second heat exchanger 7 through the four-way valve 8 .
  • the second heat exchanger 7 conducts heat exchange between the indoor air and the gaseous working medium and then the gaseous working medium is condensed to be liquefied.
  • the liquid working medium is decompressed by the expansion valve 6 and is sent to the first heat exchanger 5 .
  • the first heat exchanger 5 conducts heat exchange between the liquid working medium and the outdoor air, and then the gaseous working medium evaporates to become the gaseous working medium.
  • the gaseous working medium returns to the compressor 4 through the four-way valve 8 .
  • the second heat exchanger 7 functions as a condenser, and the first heat exchanger 5 functions as an evaporator.
  • the indoor unit 1 b sends air warmed via heat exchange at the second heat exchanger 7 to an interior during the heating.
  • FIG. 2 is a schematic diagram of configuration examples of the compressor 4 and the control device 3 .
  • the compressor 4 is, for example, a hermetically sealed compressor.
  • the compressor 4 may be of a rotary type, a scroll type, or other well-known type.
  • the compressor 4 of FIG. 2 includes a sealed container 40 , a compression mechanism 41 , and an electric motor 42 .
  • the sealed container 40 constitutes a fluidic pathway for the working medium 20 .
  • the sealed container 40 includes a suction pipe 401 and a discharge pipe 402 .
  • the working medium 20 is suctioned into the sealed container 40 via the suction pipe 401 and then is compressed by the compression mechanism 41 and thereafter is discharged to an exterior of the sealed container 40 via the discharge pipe 402 .
  • the inside of the sealed container 40 is filled with the working medium 20 with a high temperature and a high pressure together with a lubricating oil.
  • the sealed container 40 has a bottom part which constitutes an oil reservoir for storing a mixed liquid of the working medium 20 and the lubricating oil.
  • the compression mechanism 41 is positioned inside the sealed container 40 to compress the working medium.
  • the compression mechanism 41 may have a conventional configuration.
  • the compression mechanism 41 may include a cylinder forming a compression chamber, a rolling piston disposed in the compression chamber inside the cylinder, and a crank shaft coupled to the rolling piston.
  • the electric motor 42 is positioned inside the sealed container 40 to operate the compression mechanism 41 .
  • the electric motor 42 is a three-phase blushless motor.
  • FIG. 3 is a schematic diagram of configuration examples of the electric motor 42 and the control device 3 .
  • the electric motor 42 includes a rotator fixed to the crank shaft of the compression mechanism 41 and a stator provided in a vicinity of the rotator, for example.
  • the stator is configured by concentrated or distributed winding of stator windings (magnet wires) around a stator core (electrical or magnetic steel sheet or the like) with an insulation paper in-between.
  • the stator windings are covered with insulating material. Examples of the insulating material may include polyethylene terephthalate (PET), polyethylene naphthalate (PEN), aramid polymer, and polyphenylene sulfide (PPS).
  • the compressor 4 may include an accumulator for preventing liquid compression in the compression chamber of the compression mechanism 41 .
  • the accumulator separates the working medium 20 into the gaseous working medium and the liquid working medium and directs only the gaseous working medium to the sealed container 40 via the suction pipe 401 .
  • the control device 3 of 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 is configured to drive the electric motor 42 .
  • the drive circuit 31 of FIG. 2 is configured to supply drive power to the electric motor 42 based on power from a power supply 10 .
  • the power supply 10 is an alternating current power supply.
  • the drive circuit 31 is configured to supply drive power to the electric motor 42 based on alternating current power from the power supply 10 .
  • the drive circuit 31 supplies three-phase alternating current power to the electric motor 42 , as the drive power.
  • the drive circuit 31 includes a converter circuit 311 and an inverter circuit 312 .
  • the converter circuit 311 is configured to convert alternating current power from the power supply 10 into direct current power.
  • the converter circuit 311 includes a rectification circuit 311 a and a smoothing circuit 311 b .
  • the rectification circuit 311 a is a diode bridge constituted by a plurality of diodes D 1 to D 4 .
  • the power supply 10 is connected between input terminals (a connecting point between the diodes D 1 , D 2 and a connecting point between the diodes D 3 , D 4 ) of the rectification circuit 311 a and the smoothing circuit 311 b is connected between output terminals (a connecting point between the diodes D 1 , D 3 and a connecting point between the diodes D 2 , D 4 ) of the rectification circuit 311 a .
  • the smoothing circuit 311 b includes a series circuit of an inductor L 1 and a capacitor C 1 , and is configured to smooth a voltage between the output terminals of the rectification circuit 311 a to output it as a voltage across the capacitor C 1 . Configurations of the rectification circuit 311 a and the smoothing circuit 311 b of FIG. 2 are known and detailed description thereof is omitted.
  • the inverter circuit 312 is configured to supply three-phase alternating current power to the electric motor 42 based on the direct current power from the converter circuit 311 .
  • the inverter circuit 312 includes a plurality of arms U 1 , U 2 , V 1 , V 2 , W 1 , and W 2 .
  • Each of the plurality of arms U 1 , U 2 , V 1 , V 2 , W 1 , and W 2 is constituted by a semiconductor switching element such as a transistor.
  • a series circuit of the arms U 1 , U 2 is connected in parallel to the capacitor Cl of the converter circuit 311 and constitutes a U-phase leg.
  • a series circuit of the arms V 1 , V 2 is connected in parallel to the capacitor C 1 of the converter circuit 311 and constitutes a V-phase leg.
  • a series circuit of the arms W 1 , W 2 is connected in parallel to the capacitor C 1 of the converter circuit 311 and constitutes a W-phase leg. Configuration of the inverter circuit 312 of FIG. 2 is known and detailed description thereof is omitted.
  • the state detection circuit 32 is configured to detect a state of the drive circuit 31 .
  • the state of the drive circuit 31 includes a current value of a current flowing through the drive circuit 31 .
  • the current value of the current flowing through the drive circuit 31 includes current values of output alternating currents of the U-phase and W-phase legs of the drive circuit 31 .
  • the state detection circuit 32 of FIG. 2 includes a first alternating current sensor 32 a and a second alternating current sensor 32 b .
  • the first alternating current sensor 32 a detects the current value of the output alternating current of the U-phase leg of the drive circuit 31 and outputs a first detection signal indicative of the current value of the detected output alternating current to the control circuit 34 .
  • the second alternating current sensor 32 b detects the current value of the output alternating current of the W-phase leg of the drive circuit 31 and outputs a second detection signal indicative of the current value of the detected output alternating current to the control circuit 34 .
  • the temperature measurement circuit 33 is configured to measure an internal temperature of the sealed container 40 of the compressor 4 .
  • the temperature measurement circuit 33 is configured to output a measurement signal indicative of the measured internal temperature, to the control circuit 34 .
  • the temperature measurement circuit 33 may be, for example, a temperature sensor positioned inside the sealed container 40 .
  • the temperature measurement circuit 33 may not be limited to a temperature sensor positioned inside the sealed container 40 . It is sufficient that the temperature measurement circuit 33 can directly or indirectly measure the internal temperature of the sealed container 40 of the compressor 4 .
  • the control circuit 34 may be realized by a computer system including, at least, one or more processors (microprocessors) and one or more memories, for example.
  • the control circuit 34 is configured to control the drive circuit 31 .
  • the control circuit 34 is configured to control switching of the plurality of arms U 1 , U 2 , V 1 , V 2 , W 1 , and W 2 of the inverter circuit 312 of the drive circuit 31 to allow the inverter circuit 312 to supply three-phase alternating current power to the electric motor 42 based on the direct current power from the smoothing circuit 311 b.
  • the control circuit 34 is further configured to perform processing for suppressing a disproportionation reaction of the working medium circulating through the refrigerator 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 .
  • Factors of a disproportionation reaction of the working medium are considered to include heat and radicals.
  • a disproportionation reaction of the working medium may progress when radicals are generated under a high temperature and high pressure environment. Radicals may be generated by a discharge phenomenon which may be triggered when something abnormal occurs at the compressor 4 or the drive circuit 31 .
  • the control circuit 34 is configured to stop operation of the drive circuit 31 during a state where an abnormality of the drive circuit 31 has been detected based on the state detected by the state detection circuit 32 and the internal temperature measured by the temperature measurement circuit 33 has exceeded the predetermined temperature.
  • the control circuit 34 is configured to determine whether or not an abnormality of the drive circuit 31 occurs, based on the state of the drive circuit 31 detected by the state detection circuit 32 .
  • the state of the drive circuit 31 includes a current value of a current flowing through the drive circuit 31 .
  • the current value of the current flowing through the drive circuit 31 includes current values of output alternating currents of the U-phase and V-phase legs of the drive circuit 31 .
  • the abnormality of the drive circuit 31 is an electric abnormality.
  • the electric abnormality of the drive circuit 31 may include an abnormal increase in a direct current component of a current flowing through the drive circuit 31 , for example.
  • Such an abnormal increase may be triggered or caused by a malfunction (failure) of the refrigerator cycle device 1 such as a malfunction of the compressor 4 or a malfunction of the inverter circuit 312 (e.g., a malfunction of any of the plurality of arms U 1 , U 2 , V 1 , V 2 , W 1 , and W 2 ), for example.
  • a malfunction of the refrigerator cycle device 1 such as a malfunction of the compressor 4 or a malfunction of the inverter circuit 312
  • the electric abnormality of the drive circuit 31 may be detected due to some noises or the like.
  • control circuit 34 is configured to compare the current values of the output alternating current values indicated by the first and second detection signals from the state detection circuit 32 with a predetermined current value.
  • the predetermined current value may be appropriately set by analyzing a current waveforms or the like, of the drive circuit 31 when the abnormality of the drive circuit 31 occurs actually. Obviously, the predetermined current value is set to be greater than a current value of a current flowing through the drive circuit 31 when no abnormality of the drive circuit 31 occurs.
  • the control circuit 34 is configured to determine that the electric abnormality of the drive circuit 31 has occurred when at least one of the current values of the output alternating current values indicated by the first and second detection signals exceeds the predetermined current value.
  • the control circuit 34 is configured to detect the electric abnormality in response to a situation where the current value of the current flowing through the drive circuit 31 detected by the state detection circuit 32 exceeds the predetermined current value.
  • the control circuit 34 is configured to determine that no electric abnormality of the drive circuit 31 has occurred when each of the current values of the output alternating current values indicated by the first and second detection signals is equal to or smaller than the predetermined current value.
  • the control circuit 34 is configured to, when determining that the electric abnormality of the drive circuit 31 has occurred (i.e., when detecting the electric abnormality of the drive circuit 31 ), stop operation of the drive circuit 31 .
  • the control circuit 34 stops the operation of the drive circuit 31 .
  • the control circuit 34 is configured to, after stopping the operation of the drive circuit 31 , compare 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 a safety temperature of the working medium and is lower than a heatproof (heat-resistant) temperature of an insulating member of the electric motor 42 of the compressor 4 .
  • the safety temperature of the working medium may be set based on a temperature at which a disproportionation reaction of the working medium occurs under a pressure condition in a case of normal operation of the refrigerator cycle device 1 .
  • the safety temperature of the working medium is set to 150° C.
  • the heatproof temperature of the electric motor 42 of the compressor 4 may be set based on a heatproof temperature of an insulating member of the electric motor 42 of the compressor 4 , for example.
  • the heatproof temperature of the insulating member of the electric motor 42 may be a heatproof temperature of an insulating component with a heatproof temperature which is the lowest of heatproof temperatures of insulating components of the electric motor 42 .
  • an insulating component the heatproof temperature of which is the lowest in the electric motor 42 may be insulating paper between a stator core (electrical or magnetic steel sheet or the like) and a stator winding (magnet wire or the like).
  • the insulating paper has a heatproof temperature of 120° C. when its thermal class is E defined in JIS C 4003, for example.
  • the predetermined temperature is set to a temperature lower than 120° C.
  • a safety margin may be set to about 5° C. in consideration of a temperature detection time difference between a temperature of the working medium and a stator, or heat dissipation.
  • the predetermined temperature may be set to 115° C.
  • the safety margin may depend on a distance between the temperature measurement circuit 33 and the stator or a motor efficiency, and therefore it may not be 5° C. but may be a value within a range of 0 to 20° C.
  • the thermal class of the insulating paper may not be limited to E, but may be B, F, or the like.
  • the heatproof temperature is 130° C.
  • the predetermined temperature is set to a temperature lower than 130° C., e.g., 125° C.
  • the thermal class is F
  • the heatproof temperature is 155° C.
  • the safety temperature of the working medium is 150° C.
  • the predetermined temperature is set to a temperature lower than 150° C., e.g., 145° C.
  • the control circuit 34 is configured to, when the internal temperature indicated by the measurement signal from the temperature measurement circuit 33 exceeds the predetermined temperature, continues the stop of the operation of the drive circuit 31 .
  • the drive circuit 31 has its abnormality and the internal temperature exceeds the predetermined temperature, a disproportionation reaction of the working medium may be considered to be more likely to progress. Accordingly, to suppress a disproportionation reaction of the working medium, the operation of the drive circuit 31 is kept stopped.
  • the control circuit 34 stops the operation of the drive circuit 31 . In this case, the control circuit 34 may output error notification indicating that there may be a possibility of occurrence of a disproportionation reaction of the working medium.
  • the control circuit 34 is configured to, when the internal temperature indicated by the measurement signal from the temperature measurement circuit 33 is equal to or lower than the predetermined temperature, restart (resume) the operation of the drive circuit 31 . Even when the abnormality of the drive circuit 31 has been detected, it is considered that there is a low possibility that a disproportionation reaction of the working medium progresses if the internal temperature is equal to or lower than the predetermined temperature. Therefore, the control circuit 34 restarts the operation of the drive circuit 31 .
  • the control circuit 34 is configured to count a number of times of detection of the abnormality.
  • the control circuit 34 is configured to compare the number of times of detection of the drive circuit 31 with a predetermined number of times corresponding to the abnormality of the drive circuit 31 .
  • the control circuit 34 is configured to, when the number of times of detection exceeds the predetermined number of times, stop the operation of the drive circuit 31 .
  • the control circuit 34 may output error notification indicating that there may be a possibility of occurrence of the abnormality such as a malfunction of the refrigerator cycle device 1 .
  • the control circuit 34 stops the operation of the drive circuit 31 at the time of detection of the current abnormality of the drive circuit 31 . Therefore, the control circuit 34 continues the stop of the operation of the drive circuit 31 when the number of times of detection has exceeded the predetermined number of times.
  • the control circuit 34 may restart the operation of the drive circuit 31 while the number of times of detection is kept equal to or smaller than the predetermined number of times.
  • the control circuit 34 continues the stop of the operation of the drive circuit 31 even in a case where the number of times of detection is kept equal to or smaller than the predetermined number of times.
  • FIG. 3 is a flow chart of one example of operation of the control circuit 34 of the control device 3 .
  • the control circuit 34 detects the state of the drive circuit 31 , by the state detection circuit 32 (S 11 ).
  • 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 values of the output alternating current values of the U-phase and W-phase legs of the drive circuit 31 .
  • the control circuit 34 determines whether or not the abnormality of the drive circuit 31 has occurred, based on the state detected by the state detection circuit 32 (S 12 ). In the present embodiment, the control circuit 34 compares the current values of the output alternating current values indicated by the first and second detection signals from the state detection circuit 32 , with the predetermined current value.
  • control circuit 34 determines that the electric abnormality of the drive circuit 31 has not yet occurred (S 12 ; NO).
  • the control circuit 34 determines that the electric abnormality of the drive circuit 31 has occurred (S 12 ; YES). The control circuit 34 stops the operation of the drive circuit 31 (S 13 ).
  • control circuit 34 compares the internal temperature indicated by the measurement signal from the temperature measurement circuit 33 , with the predetermined temperature (S 14 ).
  • the control circuit 34 When the internal temperature indicated by the measurement signal from the temperature measurement circuit 33 exceeds the predetermined temperature (S 14 ; YES), the control circuit 34 continues the stop of the operation of the drive circuit 31 (S 15 ). Then, the control circuit 34 outputs error notification indicating that there may be a possibility of occurrence of a disproportionation reaction (S 16 ).
  • step S 14 when the internal temperature indicated by the measurement signal from the temperature measurement circuit 33 is equal to or smaller than the predetermined temperature, the control circuit 34 increments the number of times of detection of the abnormality of the drive circuit 31 , by one (S 17 ).
  • the control circuit 34 compares the number of times of detection of the abnormality of the drive circuit 31 with the predetermined number of times corresponding to the abnormality of the drive circuit 31 (S 18 ).
  • the control circuit 34 When the number of times of detection exceeds the predetermined number of times (S 18 ; YES), the control circuit 34 continues the stop of the operation of the drive circuit 31 (S 19 ). Then, the control circuit 34 outputs the error notification indicating that there may be a possibility of occurrence of the abnormality such as a malfunction of the refrigerator cycle device 1 (S 20 ).
  • step S 18 when the number of times of detection is equal to or smaller than the predetermined number of times (S 18 ; NO), the control circuit 34 restarts the operation of the drive circuit 31 (S 21 ).
  • the control circuit 34 stops the operation of the drive circuit 31 during a state where the abnormality of the drive circuit 31 has been detected based on the state detected by the state detection circuit 32 and the internal temperature measured by the temperature measurement circuit 33 has exceeded the predetermined temperature.
  • the control circuit 34 stops the operation of the drive circuit 31 when the abnormality is detected, and continues the stop of the operation of the drive circuit 31 while the internal temperature measured by the temperature measurement circuit 33 exceeds the predetermined temperature.
  • the control circuit 34 can suppress a discharge phenomenon which may cause radicals which may triggers a disproportionation reaction of the working medium.
  • the aforementioned refrigeration cycle device 1 and includes: the refrigeration cycle circuit 2 including the compressor 4 , the condenser (the first heat exchanger 5 , the second heat exchanger 7 ), the expansion valve 6 and the evaporator (the first heat exchanger 5 , the second heat exchanger 7 ) and allowing circulation of the working medium 20 ; and the control device 3 configured to control the compressor 4 of the refrigeration cycle circuit 2 .
  • the working medium 20 contains ethylene-based fluoroolefin as a refrigerant component.
  • the compressor 4 includes: the sealed container 40 constituting a fluidic pathway for the working medium 20 ; the compression mechanism 41 positioned inside the sealed container 40 to compress the working medium 20 ; and the electric motor 42 positioned inside the sealed container 40 to operate the compression mechanism 41 .
  • the control circuit 34 is configured to: in response to detection of the abnormality, stop the operation of the drive circuit 31 ; subsequent to stop of the operation of the drive circuit 31 , determine whether or not the internal temperature measured by the temperature measurement circuit 33 exceeds the predetermined temperature; and when the internal temperature measured by the temperature measurement circuit 33 exceeds the predetermined temperature, continues the stop of the operation of the drive circuit 31 , and when the internal temperature measured by the temperature measurement circuit 33 is equal to or lower than the predetermined temperature, restart the operation of the drive circuit 31 .
  • This configuration enables improvement of effect of suppression of a disproportionation reaction of the working medium.
  • the control circuit 34 is configured to: count a number of times of detection of the abnormality; and when the number of times of detection exceeds a predetermined number of times corresponding to the abnormality, stop the operation of the drive circuit 31 . This configuration enables improvement of safety of operation of the refrigeration cycle device 1 .
  • the state includes the current value of the current flowing through the drive circuit 31 (current values of output alternating currents of the U-phase and W-phase legs of the drive circuit 31 ).
  • the abnormality includes the electric abnormality of the drive circuit 31 .
  • the control circuit 34 is configured to detect the electric abnormality in response to a situation where the current value of the current flowing through the drive circuit 31 detected by the state detection circuit 32 exceeds the predetermined current value. This configuration enables suppression of a disproportionation reaction of the working medium caused by the abnormality of the drive circuit 31 .
  • the predetermined temperature is lower than the safety temperature of the working medium 20 and is lower than the heatproof temperature of the electric motor 42 of the compressor 4 . This configuration enables suppression of a disproportionation reaction of the working medium.
  • the working medium 20 further contains a saturated hydrocarbon. This configuration enables suppression of a disproportionation reaction of the working medium.
  • the working medium 20 contains a haloalkane with 1 or 2 carbon atoms as a disproportionation inhibitor for suppressing a disproportionation reaction of the ethylene-based fluoroolefin. This configuration enables suppression of a disproportionation reaction of the working medium.
  • the saturated hydrocarbon contains n-propane. This configuration enables suppression of a disproportionation reaction of the working medium.
  • Embodiments of the present disclosure are not limited to the above embodiment.
  • the above embodiment may be modified in various ways in accordance with designs or the like to an extent that they can achieve the problem of the present disclosure.
  • some variations or modifications of the above embodiment will be listed.
  • One or more of the variations or modifications described below may apply in combination with one or more of the others.
  • FIG. 4 is a schematic diagram of configuration examples of the compressor 4 and a control device 3 A of a refrigerator cycle device of variation 1.
  • the control device 3 A of FIG. 4 includes the drive circuit 31 , a state detection circuit 32 A, the temperature measurement circuit 33 , and a control circuit 34 A.
  • the state detection circuit 32 A is configured to detect a state of the drive circuit 31 .
  • the state of the drive circuit 31 is a current value of a current flowing through the drive circuit 31 .
  • the current value of the current of the drive circuit 31 includes a current value of a direct current flowing between the converter circuit 311 and the inverter circuit 312 , of the drive circuit 31 .
  • the state detection circuit 32 A of FIG. 4 is a shunt resistor connected between a connecting point between the diode D 4 and the capacitor C 1 , of the converter circuit 311 and a connecting point among the legs U 2 , V 2 , and W 2 of the inverter circuit 312 , for example.
  • a voltage across the state detection circuit 32 A indicates the current value of the direct current flowing between the converter circuit 311 and the inverter circuit 312 , of the drive circuit 31 .
  • the control circuit 34 A is configured to determine whether or not an abnormality of the drive circuit 31 occurs, based on the state of the drive circuit 31 detected by the state detection circuit 32 A.
  • the state of the drive circuit 31 includes a current value of a 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 direct current flowing between the converter circuit 311 and the inverter circuit 312 , of the drive circuit 31 .
  • the abnormality of the drive circuit 31 is an electric abnormality of the drive circuit 31 .
  • the electric abnormality of the drive circuit 31 may include an abnormal increase in a direct current component of a current flowing through the drive circuit 31 , for example.
  • Such an abnormal increase may be triggered or caused by a malfunction of the refrigerator cycle device 1 such as a malfunction of the compressor 4 or a malfunction of the inverter circuit 312 (e.g., a malfunction of any of the plurality of arms U 1 , U 2 , V 1 , V 2 , W 1 , and W 2 ), for example.
  • a malfunction of the refrigerator cycle device 1 such as a malfunction of the compressor 4 or a malfunction of the inverter circuit 312
  • the electric abnormality of the drive circuit 31 may be detected due to some noises or the like.
  • the control circuit 34 A is configured to compare the current value of the direct 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 32 A, with a predetermined current value.
  • the predetermined current value may be appropriately set by analyzing a current waveforms or the like, of the drive circuit 31 when the abnormality of the drive circuit 31 occurs actually. Obviously, the predetermined current value is set to be greater than a current value of a current flowing through the drive circuit 31 when no abnormality of the drive circuit 31 occurs.
  • the control circuit 34 A is configured to determine that the electric abnormality of the drive circuit 31 has occurred when the current value of the direct current flowing between the converter circuit 311 and the inverter circuit 312 , of the drive circuit 31 exceeds the predetermined current value.
  • the control circuit 34 A is configured to detect the electric abnormality in response to a situation where the current value of the direct current flowing between the converter circuit 311 and the inverter circuit 312 , of the drive circuit 31 exceeds the predetermined current value.
  • the control circuit 34 A is configured to determine that no electric abnormality of the drive circuit 31 has occurred when the current value of the direct current flowing between the converter circuit 311 and the inverter circuit 312 , of the drive circuit 31 is equal to or smaller than the predetermined current value.
  • the control circuit 34 A stops the operation of the drive circuit 31 during a state where the abnormality of the drive circuit 31 (the electric abnormality of the drive circuit 31 ) has been detected based on the state detected by the state detection circuit 32 A and the internal temperature measured by the temperature measurement circuit 33 has exceeded the predetermined temperature.
  • the control circuit 34 A stops the operation of the drive circuit 31 when the abnormality is detected, and continues the stop of the operation of the drive circuit 31 while the internal temperature measured by the temperature measurement circuit 33 exceeds the predetermined temperature.
  • the control circuit 34 A can suppress a discharge phenomenon which may cause radicals which may triggers a disproportionation reaction of the working medium.
  • the control device 3 A includes: the drive circuit 31 configured to drive the electric motor 42 ; the state detection circuit 32 A configured to detect the state of the drive circuit 31 ; the temperature measurement circuit 33 configured to measure the internal temperature of the sealed container 40 of the compressor 4 ; and the control circuit 34 A configured to control the drive circuit 31 .
  • the control circuit 34 A is configured to stop operation of the drive circuit 31 during a state where the abnormality of the drive circuit 31 has been detected based on the state detected by the state detection circuit 32 A and the internal temperature measured by the temperature measurement circuit 33 has exceeded the predetermined temperature. This configuration enables suppression of a disproportionation reaction of the working medium.
  • the state includes the current value of the current flowing through the drive circuit 31 .
  • the abnormality includes the electric abnormality of the drive circuit 31 .
  • the control circuit 34 A is configured to detect the electric abnormality in response to a situation where the current value of the current flowing through the drive circuit 31 detected by the state detection circuit 32 A exceeds the predetermined current value. This configuration enables suppression of a disproportionation reaction of the working medium caused by the abnormality of the drive circuit 31 .
  • FIG. 5 is a schematic diagram of configuration examples of the compressor 4 and a control device 3 B of a refrigerator cycle device of variation 2.
  • the control device 3 B of FIG. 5 includes the drive circuit 31 , a state detection circuit 32 B, the temperature measurement circuit 33 , and a control circuit 34 B.
  • the state detection circuit 32 B is configured to detect a state of the compressor 4 .
  • the state of the compressor 4 is a current value of a phase current of the compressor 4 .
  • the current value of the phase current of the compressor 4 includes current values of individual U-phase, V-phase, and W-phase currents.
  • the state detection circuit 32 B of 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 electric 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 electric motor 42 of the compressor 4 .
  • Voltages across the U-phase, V-shape, and W-shape shunt resistors Ru, Rv, and Rw of the state detection circuit 32 B respectively indicate the current values of the U-phase, V-phase and W-phase currents.
  • the control circuit 34 B is configured to determine whether or not an abnormality of the compressor 4 occurs, based on the state of the compressor 4 detected by the state detection circuit 32 B.
  • the abnormality of the compressor 4 includes an abnormality relating to layer short of the compressor 4 .
  • the abnormality relating to the layer short of the compressor 4 may include the layer short of the compressor 4 as such, an abnormality likely to cause the layer short of the compressor 4 , and an abnormality possibly caused or triggered by the layer short of the compressor 4 .
  • Concrete examples of the abnormality relating to the layer short of the compressor 4 may include the layer short of the compressor 4 , an electric fault of the compressor 4 , and an open-phase operation of the compressor 4 . In a state where imbalance of the phase current of the compressor 4 occurs, the abnormality relating to the layer short of the compressor 4 may have occurred.
  • the control circuit 34 B is configured to determine whether or not the imbalance of the phase current of the compressor 4 has occurred, based on the current value of the phase current of the compressor 4 obtained from the state detection circuit 32 B.
  • the imbalance of the phase current of the compressor 4 is considered to have occurred, if it is not satisfied that the U-phase, V-phase and W-phase currents of the compressor 4 have the same amplitude but phases 120 degrees shifted.
  • the control circuit 34 B is configured to determine that the abnormality relating to the layer short of the compressor 4 occurs when the imbalance of the phase current of the compressor 4 has occurred.
  • the control circuit 34 B is configured to detect the abnormality relating to the layer short of the compressor 4 in response to the imbalance of the phase current of the compressor 4 .
  • the control circuit 34 B is configured to determine that the abnormality relating to the layer short of the compressor 4 does not occur when the imbalance of the phase current of the compressor 4 has not occurred.
  • the control circuit 34 B stops the operation of the drive circuit 31 during a state where the abnormality of the compressor 4 (the abnormality relating to the layer short of the compressor 4 ) has been detected based on the state detected by the state detection circuit 32 B and the internal temperature measured by the temperature measurement circuit 33 has exceeded the predetermined temperature.
  • the control circuit 34 B stops the operation of the drive circuit 31 when the abnormality is detected, and continues the stop of the operation of the drive circuit 31 while the internal temperature measured by the temperature measurement circuit 33 exceeds the predetermined temperature.
  • the control circuit 34 B can suppress a discharge phenomenon which may cause radicals which may triggers a disproportionation reaction of the working medium, and as a result can suppress a disproportionation reaction of the working medium.
  • the control device 3 B includes: the drive circuit 31 configured to drive the electric motor 42 ; the state detection circuit 32 B configured to detect the state of the compressor 4 ; the temperature measurement circuit 33 configured to measure the internal temperature of the sealed container 40 of the compressor 4 ; and the control circuit 34 B configured to control the drive circuit 31 .
  • the control circuit 34 B is configured to stop operation of the drive circuit 31 during a state where the abnormality of the compressor 4 has been detected based on the state detected by the state detection circuit 32 B and the internal temperature measured by the temperature measurement circuit 33 has exceeded the predetermined temperature. This configuration enables suppression of a disproportionation reaction of the working medium.
  • the state includes the phase current of the compressor 4 .
  • the abnormality includes the abnormality relating to the layer short of the compressor 4 .
  • the control circuit 34 B is configured to detect the abnormality relating to the layer short of the compressor 4 in response to the imbalance of the phase current of the compressor 4 . This configuration enables suppression of a disproportionation reaction of the working medium caused by the abnormality of the compressor 4 .
  • the control circuit 34 C is configured to determine whether or not the deviation of the rotational frequency of the electric motor 42 of the compressor 4 has occurred, based on the rotational frequency of the electric motor 42 of the compressor 4 obtained from the state detection circuit 32 C.
  • the control circuit 34 C is configured to set operation frequencies (switching frequencies) of the plurality of legs U 1 , U 2 , V 1 , V 2 , W 1 , and W 2 of the inverter circuit 312 of the drive circuit 31 to allow the rotational frequency of the electric motor 42 of the compressor 4 to be equal to a desired rotational frequency. While there is no abnormality of the compressor 4 , the rotational frequency of the electric motor 42 of the compressor 4 detected by the state detection circuit 32 C falls within a predetermined range based on the desired rotational frequency.
  • the control circuit 34 C is configured to determine that the deviation of the rotational frequency of the electric motor 42 of the compressor 4 has occurred, when the rotational frequency of the electric motor 42 of the compressor 4 detected by the state detection circuit 32 C does not fall within the predetermined range.
  • the control circuit 34 C is configured to determine that the abnormality relating to the layer short of the compressor 4 occurs when the deviation of the rotational frequency of the electric motor 42 of the compressor 4 has occurred.
  • the control circuit 34 C is configured to detect the abnormality relating to the layer short of the compressor 4 in response to the deviation of the rotational frequency of the electric motor 42 of the compressor 4 .
  • the control circuit 34 C is configured to determine that the abnormality relating to the layer short of the compressor 4 does not occur when the deviation of the rotational frequency of the electric motor 42 of the compressor 4 has not occurred.
  • the aforementioned control device 3 C includes: the drive circuit 31 configured to drive the electric motor 42 ; the state detection circuit 32 C configured to detect the state of the compressor 4 ; the temperature measurement circuit 33 configured to measure the internal temperature of the sealed container 40 of the compressor 4 ; and the control circuit 34 C configured to control the drive circuit 31 .
  • the control circuit 34 C is configured to stop operation of the drive circuit 31 during a state where the abnormality of the compressor 4 has been detected based on the state detected by the state detection circuit 32 C and the internal temperature measured by the temperature measurement circuit 33 has exceeded the predetermined temperature. This configuration enables suppression of a disproportionation reaction of the working medium.
  • the state detection circuit 32 A may be a shunt resistor connected between a connecting point between the inductor L 1 and the capacitor C 1 , of the converter circuit 311 and a connecting point among the legs U 1 , V 1 , and W 1 of the inverter circuit 312 .
  • the state detection circuit 32 A may not be limited to shunt resistors.
  • the state detection circuit 32 A may be a conventional direct current sensor.
  • the state detection circuit 32 B may not be limited to shunt resistors.
  • the state detection circuit 32 B may be a conventional alternating current sensor.
  • control circuit 34 , 34 A, 34 B, or 34 C may stop the operation of the drive circuit 31 only in a duration when the internal temperature measured by the temperature measurement circuit 33 exceeds the predetermined temperature.
  • the refrigeration cycle device is not limited to an air conditioner with a configuration where one indoor unit is connected to one outdoor unit (so called, a room air conditioner (RAC)).
  • the refrigeration cycle device may be an air conditioner with a configuration where a plurality of indoor units are connected to one or more outdoor units (so-called, a package air conditioner (PAC) or a variable refrigerant flow (VRF)).
  • the refrigeration cycle device is not limited to an air conditioner, but may be a freezing or refrigerating device such as a refrigerator or a freezer.
  • the present disclosure includes the following aspects.
  • reference signs in parenthesis are attached for the purpose of clearly showing correspondence with the embodiments only. Note that, in consideration of readability of texts, the reference signs in parentheses may be omitted from the second and subsequent times.
  • a first aspect is a refrigeration cycle device ( 1 ) and includes: a refrigeration cycle circuit ( 2 ) including a compressor ( 4 ), a condenser (the first heat exchanger 5 , the second heat exchanger 7 ), an expansion valve ( 6 ) and an evaporator (the first heat exchanger 5 , the second heat exchanger 7 ), and allowing circulation of a working medium ( 20 ); and a control device ( 3 ; 3 A; 3 B; 3 C) configured to control the compressor ( 4 ) of the refrigeration cycle circuit ( 2 ).
  • the working medium ( 20 ) contains ethylene-based fluoroolefin as a refrigerant component.
  • the compressor ( 4 ) includes: a sealed container ( 40 ) constituting a fluidic pathway for the working medium ( 20 ); a compression mechanism ( 41 ) positioned inside the sealed container ( 40 ) to compress the working medium ( 20 ); and an electric motor ( 42 ) positioned inside the sealed container ( 40 ) to operate the compression mechanism ( 41 ).
  • the control circuit ( 34 ; 34 A; 34 B; 34 C) is configured to stop operation of the drive circuit ( 31 ) during a state where an abnormality of at least one of the compressor ( 4 ) or the drive circuit ( 31 ) has been detected based on the state detected by the state detection circuit ( 32 ; 32 A; 32 B; 32 C) and the internal temperature measured by the temperature measurement circuit ( 33 ) has exceeded a predetermined temperature. This aspect enables suppression of a disproportionation reaction of the working medium.
  • a second aspect is a refrigeration cycle device ( 1 ) based on the first aspect.
  • the control circuit ( 34 ; 34 A; 34 B; 34 C) is configured to: in response to detection of the abnormality, stop the operation of the drive circuit ( 31 ); subsequent to stop of the operation of the drive circuit ( 31 ), determine whether or not the internal temperature measured by the temperature measurement circuit ( 33 ) exceeds the predetermined temperature; and when the internal temperature measured by the temperature measurement circuit ( 33 ) exceeds the predetermined temperature, continues the stop of the operation of the drive circuit ( 31 ), and when the internal temperature measured by the temperature measurement circuit ( 33 ) is equal to or lower than the predetermined temperature, restart the operation of the drive circuit ( 31 ).
  • This aspect enables improvement of effect of suppression of a disproportionation reaction of the working medium.
  • a third aspect is a refrigeration cycle device ( 1 ) based on the second aspect.
  • the control circuit ( 34 ; 34 A; 34 B; 34 C) is configured to: count a number of times of detection of the abnormality; and when the number of times of detection exceeds a predetermined number of times corresponding to the abnormality, stop the operation of the drive circuit ( 31 ). This aspect enables improvement of 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 an electric abnormality of the drive circuit ( 31 ).
  • the control circuit ( 34 ; 34 A) is configured to detect the electric abnormality in response to a situation where the current value of the current flowing through the drive circuit ( 31 ) detected by the state detection circuit ( 32 ; 32 A) exceeds a predetermined current value. This aspect enables suppression of a disproportionation reaction of the working medium caused by the abnormality of 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 phase current of the compressor ( 4 ) or a rotational frequency of the electric motor ( 42 ) of the compressor ( 4 ).
  • the abnormality includes an abnormality relating to layer short of the compressor ( 4 ).
  • the control circuit ( 34 B; 34 C) is configured to detect the abnormality relating to the layer short of the compressor ( 4 ) in response to at least one of imbalance of the phase current of the compressor ( 4 ) or a deviation of the rotational frequency of the electric motor ( 42 ) of the compressor ( 4 ). This aspect enables suppression of a disproportionation reaction of the working medium caused by the abnormality of 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 a safety temperature of the working medium ( 20 ) and is lower than a heatproof temperature of the electric motor ( 42 ) of the compressor ( 4 ). This aspect enables suppression of a disproportionation reaction 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 contains ethylene-based fluoroolefin likely to undergo a disproportionation reaction. This aspect enables suppression of a disproportionation reaction of the working medium.
  • An eighth aspect is a refrigeration cycle device ( 1 ) based on any one of the first to seventh aspects.
  • the ethylene-based fluoroolefin is 1,1,2-trifluoroethylene, trans-1,2-difluoroethylene, cis-1,2-difluoroethylene, 1,1-difluoroethylene, tetrafluoroethylene, or monofluoroethylene. This aspect enables suppression of a disproportionation reaction 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 ) contains difluoromethane as the refrigerant component. This aspect enables suppression of a disproportionation reaction 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 contains a saturated hydrocarbon. This aspect enables suppression of a disproportionation reaction of the working medium.
  • An eleventh aspect is a refrigeration cycle device ( 1 ) based on any one of the first to tenth aspects.
  • the working medium contains a haloalkane with 1 or 2 carbon atoms as a disproportionation inhibitor for suppressing a disproportionation reaction of the ethylene-based fluoroolefin. This aspect enables suppression of a disproportionation reaction of the working medium.
  • a twelfth aspect is a refrigeration cycle device ( 1 ) based on the tenth aspect.
  • the saturated hydrocarbon contains n-propane. This aspect enables suppression of a disproportionation reaction of the working medium.
  • the second to twelfth aspects are optional and not essential.
  • the present disclosure is applicable to refrigerator cycle devices.
  • the present disclosure is applicable to a refrigerator cycle device using a working medium containing ethylene-based fluoroolefin as a refrigerant component.

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  • 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)
US18/860,407 2022-04-28 2023-04-18 Refrigeration cycle device Pending US20250290678A1 (en)

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US8045302B2 (en) * 2008-02-20 2011-10-25 Emerson Climate Technologies, Inc. Compressor protection and grid fault detection device
JP5357435B2 (ja) * 2008-03-10 2013-12-04 三菱重工業株式会社 輸送用冷凍装置
JP2009222351A (ja) * 2008-03-18 2009-10-01 Daikin Ind Ltd 冷凍装置
CN106085363A (zh) 2011-05-19 2016-11-09 旭硝子株式会社 工作介质及热循环系统
EP2711407B1 (en) 2011-05-19 2018-11-07 AGC Inc. Working medium and heat-cycle system
JP6979565B2 (ja) * 2017-04-13 2021-12-15 パナソニックＩｐマネジメント株式会社 冷凍サイクル装置
JP2019019984A (ja) * 2017-07-11 2019-02-07 株式会社富士通ゼネラル ロータリ圧縮機及び空気調和装置
JP6861341B2 (ja) * 2017-08-08 2021-04-21 パナソニックＩｐマネジメント株式会社 冷凍サイクル装置
JP6857813B2 (ja) * 2018-03-05 2021-04-14 パナソニックＩｐマネジメント株式会社 冷凍サイクル装置
JP6642756B2 (ja) * 2018-04-25 2020-02-12 ダイキン工業株式会社 冷媒を含有する組成物、熱移動媒体及び熱サイクルシステム
JP7157589B2 (ja) * 2018-08-13 2022-10-20 三菱重工サーマルシステムズ株式会社 制御装置、冷凍機、制御方法及び異常検出方法
JP7515064B2 (ja) * 2020-04-01 2024-07-12 パナソニックＩｐマネジメント株式会社 冷凍サイクル用作動媒体および冷凍サイクルシステム
JP7478013B2 (ja) * 2020-04-08 2024-05-02 ホシザキ株式会社 消毒保管庫
JP7117537B2 (ja) * 2020-07-27 2022-08-15 パナソニックＩｐマネジメント株式会社 冷凍サイクル用作動媒体の不均化反応の抑制方法および冷凍サイクル用作動媒体の製造方法
JP7168892B2 (ja) * 2020-09-04 2022-11-10 ダイキン工業株式会社 冷媒としての使用、および、冷凍サイクル装置

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