EP3361190A1 - Dispositif à cycles de réfrigération et procédé de commande pour déterminer des fuites dans la soupape de dérivation du dispositif à cycles de réfrigération - Google Patents

Dispositif à cycles de réfrigération et procédé de commande pour déterminer des fuites dans la soupape de dérivation du dispositif à cycles de réfrigération Download PDF

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Publication number
EP3361190A1
EP3361190A1 EP16885082.4A EP16885082A EP3361190A1 EP 3361190 A1 EP3361190 A1 EP 3361190A1 EP 16885082 A EP16885082 A EP 16885082A EP 3361190 A1 EP3361190 A1 EP 3361190A1
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EP
European Patent Office
Prior art keywords
refrigerant
pipe
bypass valve
compressor
bypass
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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.)
Granted
Application number
EP16885082.4A
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German (de)
English (en)
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EP3361190B1 (fr
EP3361190A4 (fr
Inventor
Takahiro Kato
Tatsuhiro Yasuda
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Mitsubishi Heavy Industries Thermal Systems Ltd
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Mitsubishi Heavy Industries Thermal Systems Ltd
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Publication of EP3361190A4 publication Critical patent/EP3361190A4/fr
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B31/00—Compressor arrangements
    • F25B31/006—Cooling of compressor or motor
    • F25B31/008—Cooling of compressor or motor by injecting a liquid
    • 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
    • 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—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/04—Refrigeration circuit bypassing means
    • F25B2400/0409—Refrigeration circuit bypassing means for the evaporator
    • 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
    • F25B2500/00—Problems to be solved
    • F25B2500/08—Exceeding a certain temperature value in a refrigeration component or 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
    • F25B2500/00—Problems to be solved
    • F25B2500/22—Preventing, detecting or repairing leaks of refrigeration fluids
    • F25B2500/222—Detecting refrigerant leaks
    • 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
    • F25B2600/21—Refrigerant outlet evaporator temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2501—Bypass valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/19—Pressures
    • F25B2700/193—Pressures of the compressor
    • F25B2700/1931—Discharge pressures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/19—Pressures
    • F25B2700/193—Pressures of the compressor
    • F25B2700/1933—Suction pressures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2101—Temperatures in a bypass
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2700/00—Sensing or detecting of parameters; Sensors therefor
    • F25B2700/21—Temperatures
    • F25B2700/2115—Temperatures of a compressor or the drive means therefor
    • F25B2700/21151—Temperatures of a compressor or the drive means therefor at the suction side of the compressor
    • 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
    • F25B2700/21152—Temperatures of a compressor or the drive means therefor at the discharge side 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
    • F25B2700/21156—Temperatures of a compressor or the drive means therefor of the motor

Definitions

  • the present invention relates to a refrigeration cycle device in which a compressor, a condenser, an expansion valve, and an evaporator are connected to one another by piping, and a control method for determination of leaks in a bypass valve of a refrigeration cycle device.
  • a refrigeration cycle device having a configuration in which a compressor which compresses a refrigerant, a condenser which cools and condenses the compressed gas refrigerant, an expansion valve which decompresses and expands the condensed liquid refrigerant, and an evaporator which heats and evaporates the decompressed liquid refrigerant are connected by piping is known (refer to, for example, PTL 1).
  • the present invention has been made in view of the above circumstances and has an object to provide a refrigeration cycle device in which whether or not liquid flooding to a compressor is caused by leakage in a bypass valve can be easily determined, and a control method for determination of leaks in a bypass valve of a refrigeration cycle device.
  • a refrigeration cycle device in which a compressor, a condenser, an expansion valve, and an evaporator are connected to one another by piping
  • the refrigeration cycle device including: a bypass pipe that has one end connected to a liquid pipe between the condenser and the evaporator and the other end connected to a suction pipe of the compressor, and bypasses the evaporator; a bypass valve that controls a flow of a refrigerant in the bypass pipe; a liquid flooding determination unit that determines presence or absence of liquid flooding of the refrigerant to the compressor; and a bypass valve leakage determination unit that determines whether or not the liquid flooding is caused by leakage in the bypass valve, based on a first suction superheat degree of the refrigerant acquired further on the upstream side than the other end of the bypass pipe in the suction pipe.
  • the bypass valve leakage determination unit that determines whether or not the liquid flooding is caused by leakage in the bypass valve, based on a first suction superheat degree of the refrigerant acquired further on the upstream side than the other end of the bypass pipe in the suction pipe, is provided, and therefore, it is possible to easily determine whether or not the liquid flooding to the compressor is caused by leakage in the bypass valve.
  • the liquid flooding determination unit may determine that the liquid flooding has occurred, in a case where a second suction superheat degree of the refrigerant acquired at a bottom portion of a casing of the compressor or a discharge superheat degree of the refrigerant which is discharged from the compressor has become equal to or lower than each predetermined reference value determined in advance. According to this configuration, the presence or absence of the liquid flooding to the compressor can be determined with a simple configuration.
  • the bypass pipe may include a throttle mechanism which is disposed between the bypass valve and the other end, an inlet temperature sensor which is disposed between the bypass valve and the one end, and an outlet temperature sensor which is disposed between the throttle mechanism and the other end.
  • an opening and closing operation of the bypass valve may be repeatedly executed. According to this configuration, in a case where the cause of the leakage in the bypass valve is temporary foreign matter biting, the foreign matter is removed by the opening and closing operation. For this reason, the leakage in the bypass valve can be easily eliminated.
  • an operation of the compressor may be stopped and an abnormality warning may be issued. According to this configuration, it is possible to perform service inspection of the refrigeration cycle device while preventing damage to the compressor.
  • a control method for determination of leaks in a bypass valve of a refrigeration cycle device in which a compressor, a condenser, an expansion valve, and an evaporator are connected to one another by piping and which has a bypass pipe having one end connected to a liquid pipe between the condenser and the evaporator and the other end connected to a suction pipe of the compressor, and bypassing the evaporator, and a bypass valve that controls a flow of a refrigerant in the bypass pipe
  • the method including: a liquid flooding determination step of determining presence or absence of liquid flooding of the refrigerant to the compressor; and a bypass valve leakage determination step of determining whether or not the liquid flooding is caused by leakage in the bypass valve, based on a first suction superheat degree of the refrigerant acquired further on the upstream side than the other end of the bypass pipe in the suction pipe.
  • the bypass valve leakage determination unit that determines whether or not the liquid flooding is caused by leakage in the bypass valve, based on a first suction superheat degree of the refrigerant acquired further on the upstream side than the other end of the bypass pipe in the suction pipe, is provided, and therefore, it is possible to easily determine whether or not the liquid flooding to the compressor is caused by leakage in the bypass valve.
  • Fig. 1 is a circuit configuration diagram of an air conditioner according to this embodiment.
  • An air conditioner (a refrigeration cycle device) 1 is a so-called multi-type air conditioner which is configured to include a single outdoor unit 2 and a plurality of (in Fig. 1 , two) indoor units 3A and 3B.
  • the plurality of indoor units 3A and 3B are connected in parallel to each other through a branching unit 6 between a gas pipe 4 and a liquid pipe 5 which are connected to the outdoor unit 2.
  • the outdoor unit 2 is provided with an inverter-driven compressor 10 that compresses a refrigerant, an oil separator 11 that separates lubricating oil from a refrigerant gas, a four-way valve 12 that switches a circulation direction of the refrigerant, an outdoor heat exchanger (an evaporator or a condenser) 13 that performs heat exchange between the refrigerant and the outside air, an outdoor expansion valve (an expansion valve) 15 that is used at the time of heating to decompress and expand the refrigerant, a receiver 16 that stores a liquid refrigerant, a supercooling heat exchanger 17 that provides supercooling to the liquid refrigerant, a supercooling expansion valve 18 that controls the amount of refrigerant which is diverted to the supercooling heat exchanger 17, a gas-side operation valve 20, and a liquid-side operation valve 21. Further, the outdoor unit 2 is provided with a control device 50 that controls the operation of the entire air conditioner 1.
  • the refrigerant pipe 22 is provided with a discharge pipe 22a which connects the discharge side of the compressor 10 and the four-way valve 12, and a suction pipe 22b which connects the suction side of the compressor 10 and the four-way valve 12.
  • the refrigerant pipe 22 is configured to include an outdoor-side liquid pipe (a liquid pipe between the condenser and the evaporator) 22c which connects one end 13a of the outdoor heat exchanger 13 and the liquid-side operation valve 21, and an outdoor-side gas pipe 22d which connects the other end 13b of the outdoor heat exchanger 13 and the four-way valve 12.
  • the outdoor unit 2 is provided with an outdoor fan 24 which blows the outside air to the outdoor heat exchanger 13.
  • an oil return circuit 25 for returning the lubricating oil separated from a discharge refrigerant gas in the oil separator 11 to the compressor 10 side by a predetermined amount is provided between the oil separator 11 and the suction pipe 22b of the compressor 10.
  • the supercooling expansion valve 18 is provided in a branch liquid pipe 26 branched from the outdoor-side liquid pipe 22c, and the branch liquid pipe 26 is connected to the suction pipe 22b through the supercooling heat exchanger 17.
  • the outdoor unit 2 is provided with a bypass pipe 27 that connects the outdoor-side liquid pipe 22c and the suction pipe 22b, and a bypass valve 28 and a capillary (a throttle mechanism) 29 provided in the bypass pipe 27.
  • the bypass pipe 27 in a case where a refrigerant discharge temperature of the compressor 10 or a temperature inside a casing of the compressor 10 rises to a temperature equal to or higher than a predetermined temperature, the bypass valve 28 is opened to return an appropriate amount of liquid refrigerant to the compressor 10, thereby suppressing a temperature rise.
  • the bypass pipe 27 has one end 27a connected to the outdoor-side liquid pipe 22c between the receiver 16 and the supercooling heat exchanger 17, and the other end 27b connected to the suction pipe 22b between the compressor 10 and the branch liquid pipe 26.
  • the bypass valve 28 is an on-off valve that controls the flow of the refrigerant in the bypass pipe 27.
  • the capillary 29 is a thin tube for depressurizing the refrigerant and is provided between the bypass valve 28 and the other end 27b of the bypass pipe 27.
  • various pressure sensors or temperature sensors are provided in the outdoor-side refrigerant circuit 23.
  • a high-pressure sensor 41 for detecting the pressure of the high-pressure refrigerant discharged from the compressor 10 is provided in the discharge pipe 22a between the compressor 10 and the four-way valve 12, and a low-pressure sensor 42 for detecting the pressure of the low-pressure refrigerant that is suctioned into the compressor 10 is provided in the suction pipe 22b between the four-way valve 12 and the branch liquid pipe 26.
  • a discharge temperature sensor 43 for detecting the temperature of the discharged refrigerant is provided in the discharge pipe 22a between the compressor 10 and the oil separator 11, and a casing temperature sensor 44 for detecting the temperature of the refrigerant suctioned into a casing 10A is provided at a bottom portion of the casing 10A of the compressor 10.
  • a suction temperature sensor 45 for detecting the temperature of the low-pressure refrigerant that is suctioned into the compressor 10 is provided in the suction pipe 22b between the branch liquid pipe 26 and the compressor 10, and a supercooling coil temperature sensor 46 for detecting the temperature of the refrigerant flowing through the branch liquid pipe 26 is provided in the branch liquid pipe 26.
  • an inlet temperature sensor 47 is provided between one end 27a of the bypass pipe 27 and the bypass valve 28, and an outlet temperature sensor 48 is provided between the other end 27b of the bypass pipe 27 and the capillary 29.
  • the gas pipe 4 and the liquid pipe 5 are refrigerant pipes which are connected to the gas-side operation valve 20 and the liquid-side operation valve 21 of the outdoor unit 2, and the piping lengths thereof are appropriately set according to the distance between the outdoor unit 2 and the plurality of indoor units 3A and 3B which are connected to the outdoor unit 2, at the time of installation on site.
  • a plurality of branching units 6 are provided in the middle of the gas pipe 4 and the liquid pipe 5, and an appropriate number of indoor units 3A and 3B are connected through the branching units 6. Accordingly, a sealed one refrigeration cycle (refrigerant circuit) 7 is configured.
  • Each of the indoor units 3A and 3B has an indoor heat exchanger (an evaporator or a condenser) 30 which cools or heats indoor air through heat exchange between the indoor air and the refrigerant to provide it for indoor air conditioning, an indoor expansion valve (an expansion valve) 31 which is used at the time of cooling, and an indoor fan 32 which circulates the indoor air through the indoor heat exchanger 30, and the indoor units 3A and 3B are connected to the branching units 6 through branch gas pipes 4A and 4B and branch liquid pipes 5A and 5B on the indoor side.
  • an indoor heat exchanger an evaporator or a condenser
  • a cooling operation is performed as follows.
  • the lubricating oil included in the refrigerant is separated from the high-temperature and high-pressure refrigerant gas compressed by and discharged from the compressor 10, in the oil separator 11. Thereafter, the refrigerant gas is circulated toward the outdoor heat exchanger 13 side by the four-way valve 12, and subjected to heat exchange with the outside air which is blown by the outdoor fan 24 in the outdoor heat exchanger 13, thereby being condensed and liquefied.
  • the liquid refrigerant passes through the outdoor expansion valve 15 and is temporarily stored in the receiver 16.
  • the liquid refrigerant having a circulation amount adjusted by the receiver 16 is partially diverted from the outdoor-side liquid pipe 22c in the course of passing through the supercooling heat exchanger 17 and is subjected to heat exchange with the refrigerant adiabatically expanded in the supercooling expansion valve 18, thereby being supercooled.
  • This liquid refrigerant is led from the outdoor unit 2 to the liquid pipe 5 via the liquid-side operation valve 21 and diverted to the branch liquid pipes 5A and 5B of the indoor units 3A and 3B through the branching units 6.
  • the refrigerant used for supercooling flows into the suction pipe 22b of the compressor 10 through the branch liquid pipe 26.
  • the indoor heat exchanger 30 the indoor air which is circulated by the indoor fan 32 is subjected to heat exchange with the refrigerant to be cooled and is provided for the cooling of the indoor.
  • the refrigerant evaporates to be gasified, reaches the branching unit 6 through each of the branch gas pipes 4A and 4B, and joins the refrigerant gas from another indoor unit at the gas pipe 4.
  • This refrigerant is compressed again in the compressor 10, and the cooling operation is performed by repeating the above cycle.
  • the outdoor heat exchanger 13 functions as a condenser and the indoor heat exchanger 30 functions as an evaporator.
  • a heating operation is performed as follows.
  • the lubricating oil included in the refrigerant is separated from the high-temperature and high-pressure refrigerant gas compressed by and discharged from the compressor 10, in the oil separator 11, and the high-temperature and high-pressure refrigerant gas is then circulated toward the gas-side operation valve 20 side through the four-way valve 12.
  • the high-pressure gas refrigerant is led out from the outdoor unit 2 via the gas-side operation valve 20 and the gas pipe 4 and is introduced into the plurality of indoor units 3A and 3B via the branching units 6 and the branch gas pipes 4A and 4B on the indoor side.
  • the high-temperature and high-pressure refrigerant gas introduced into each of the indoor units 3A and 3B is subjected to heat exchange with the indoor air which is circulated through the indoor fan 32 in the indoor heat exchangers 30, and the indoor air heated in this way is blown into the room to be provided for heating.
  • the refrigerant condensed and liquefied in the indoor heat exchanger 30 reaches the branching unit 6 via the indoor expansion valve 31 and each of the branch liquid pipes 5A and 5B, joins the refrigerant from another indoor unit, and returns to the outdoor unit 2 via the liquid pipe 5.
  • the degree of opening of the indoor expansion valve 31 is controlled such that the refrigerant outlet temperature of the indoor heat exchanger 30 functioning as a condenser or the refrigerant supercooling degree reaches a control target value.
  • the refrigerant which has returned to the outdoor unit 2 reaches the supercooling heat exchanger 17 via the liquid-side operation valve 21, is supercooled similar to the case of the cooling, and then flows into the receiver 16 to be temporarily stored therein, whereby the circulation amount is adjusted.
  • This liquid refrigerant is supplied to the outdoor expansion valve 15 to be adiabatically expanded, and then flows into the outdoor heat exchanger 13.
  • the outdoor heat exchanger 13 the outside air which is blown from the outdoor fan 24 and the refrigerant perform heat exchange, and thus the refrigerant absorbs heat from the outside air and is evaporated and gasified.
  • This refrigerant passes through the four-way valve 12 from the outdoor heat exchanger 13, joins the refrigerant gas from the supercooling heat exchanger 17, is then suctioned into the compressor 10, and is compressed again in the compressor 10.
  • the heating operation is performed by repeating the above cycle.
  • the control device 50 opens the bypass valve 28 under a predetermined condition to cause the liquid refrigerant to flow from the outdoor-side liquid pipe 22c into the suction pipe 22b through the bypass pipe 27. This liquid refrigerant evaporates in the suction pipe 22b, thereby cooling the refrigerant which is suctioned into the compressor 10, and the compressor 10.
  • Fig. 2 is a block diagram showing a functional configuration of the control device.
  • the control device 50 is provided with a control unit 51, a superheat degree calculation unit 52, a liquid flooding determination unit 53, a bypass valve leakage determination unit 54, and an interface unit 55.
  • the bypass valve 28, the high-pressure sensor 41, the low-pressure sensor 42, the discharge temperature sensor 43, the casing temperature sensor 44, the suction temperature sensor 45, the supercooling coil temperature sensor 46, the inlet temperature sensor 47, the outlet temperature sensor 48, and an information unit 49 are connected to the interface unit 55.
  • the information unit 49 is, for example, a buzzer, a lamp, or the like and is an alarm device which issues an abnormality warning that the liquid flooding has occurred.
  • the control unit 51 controls liquid flooding determination processing and bypass valve leakage determination processing and also controls the operation of the entire air conditioner 1.
  • the superheat degree calculation unit 52 calculates the superheat degree of the refrigerant from the pressure and the temperature of the refrigerant during the operation of the compressor 10 and in a state where the bypass valve 28 is closed, at a plurality of locations of the outdoor-side refrigerant circuit 23. Specifically, the superheat degree calculation unit 52 calculates a discharge superheat degree T1 of the refrigerant from the deviation between the refrigerant discharge temperature which is detected by the discharge temperature sensor 43 and the saturation temperature of the discharge pressure of the refrigerant, which is detected by the high-pressure sensor 41.
  • the superheat degree calculation unit 52 calculates a casing superheat degree (a second suction superheat degree) T2 of the refrigerant from the deviation between the temperature inside the casing of the refrigerant, which is detected by the casing temperature sensor 44, and the saturation temperature of the suction pressure of the refrigerant, which is detected by the low-pressure sensor 42. Then, the superheat degree calculation unit 52 outputs the calculated discharge superheat degree T1 and the calculated casing superheat degree T2 to the liquid flooding determination unit 53.
  • a casing superheat degree (a second suction superheat degree) T2 of the refrigerant from the deviation between the temperature inside the casing of the refrigerant, which is detected by the casing temperature sensor 44, and the saturation temperature of the suction pressure of the refrigerant, which is detected by the low-pressure sensor 42. Then, the superheat degree calculation unit 52 outputs the calculated discharge superheat degree T1 and the calculated casing superheat degree T2 to the liquid flooding determination unit
  • the superheat degree calculation unit 52 calculates a suction superheat degree (a first suction superheat degree) T3 of the refrigerant from the difference between the suction temperature of the refrigerant, which is detected by the suction temperature sensor 45, and the saturation temperature of the suction pressure of the refrigerant, which is detected by the low-pressure sensor 42. Then, the superheat degree calculation unit 52 outputs the calculated suction superheat degree T3 to the bypass valve leakage determination unit 54.
  • the liquid flooding determination unit 53 determines whether or not the liquid flooding has occurred in the compressor 10, based on the acquired discharge superheat degree T1 or the acquired casing superheat degree T2. Specifically the liquid flooding determination unit 53 compares the discharge superheat degree T1 with a predetermined discharge superheat degree reference value (reference value) T1 S set in advance, and determines that the liquid flooding has occurred, if the discharge superheat degree T1 is equal to or lower than the discharge superheat degree reference value T1 S (for example, 15°C), and determines that the liquid flooding has not occurred, if the discharge superheat degree T1 is not equal to or lower than the discharge superheat degree reference value T1 S .
  • a predetermined discharge superheat degree reference value for example, 15°C
  • the liquid flooding determination unit 53 compares the casing superheat degree T2 with a predetermined casing superheat degree reference value (reference value) T2 S set in advance, and determines that the liquid flooding has occurred, if the casing superheat degree T2 is equal to or lower than the casing superheat degree reference value T2 S (for example, 10°C), and determines that the liquid flooding has not occurred, if the casing superheat degree T2 is not equal to or lower than the casing superheat degree reference value T2 S .
  • a predetermined casing superheat degree reference value (reference value) T2 S set in advance, and determines that the liquid flooding has occurred, if the casing superheat degree T2 is equal to or lower than the casing superheat degree reference value T2 S (for example, 10°C), and determines that the liquid flooding has not occurred, if the casing superheat degree T2 is not equal to or lower than the casing superheat degree reference value T2 S .
  • the liquid flooding determination unit 53 may determine whether or not the liquid flooding has occurred, by using at least one of the discharge superheat degree T1 and the casing superheat degree T2. However, by using the superheat degrees of the refrigerant on both the discharge side and the suction side, it is possible to more accurately determine the presence or absence of the occurrence of the liquid flooding.
  • the bypass valve leakage determination unit 54 determines whether or not the liquid flooding is caused by the leakage in the bypass valve 28, based on the acquired suction superheat degree T3, in a case where the liquid flooding has occurred. Specifically, the bypass valve leakage determination unit 54 compares the suction superheat degree T3 with a predetermined suction superheat degree reference value (reference value) T3 S set in advance. In this case, if the suction superheat degree T3 is equal to or higher than the suction superheat degree reference value T3 S (for example, 10°C), the liquid flooding in the suction pipe 22b which is located further on the upstream side than the bypass pipe 27 has not occurred.
  • a predetermined suction superheat degree reference value for example, 10°C
  • the bypass valve leakage determination unit 54 determines that the liquid flooding is caused by the leakage in the bypass valve 28. Further, if the suction superheat degree T3 is not equal to or higher than the suction superheat degree reference value T3 S , the liquid flooding has already occurred in the suction pipe 22b which is located further on the upstream side than the bypass pipe 27. For this reason, the bypass valve leakage determination unit 54 determines that the liquid flooding is not caused only by the leakage in the bypass valve 28.
  • the bypass valve leakage determination unit 54 obtains an inlet/outlet temperature difference T4 from the refrigerant inlet temperature and the refrigerant outlet temperature which are respectively detected by the inlet temperature sensor 47 and the outlet temperature sensor 48 provided in the bypass pipe 27, and determines the presence or absence of the leakage in the bypass valve 28, based on the inlet/outlet temperature difference T4.
  • the bypass valve leakage determination unit 54 determines that leakage occurs in the bypass valve 28. Further, if the inlet/outlet temperature difference T4 is not equal to or higher than the predetermined inlet/outlet temperature difference reference value T4 S , the bypass valve leakage determination unit 54 determines that there is no leakage in the bypass valve 28.
  • a predetermined inlet/outlet temperature difference reference value T4 S for example, 5°C
  • the inlet temperature sensor 47 and the outlet temperature sensor 48 are provided in the bypass pipe 27, and the presence or absence of the leakage in the bypass valve 28 can be accurately determined by the value of the inlet/outlet temperature difference T4 detected by the inlet temperature sensor 47 and the outlet temperature sensor 48.
  • the control unit 51 repeats an opening and closing operation to sequentially close, open, and close the bypass valve 28 by multiple times (for example, three times). It is empirically known that the leakage in the bypass valve 28 sometimes occurs, for example, due to foreign matter being temporarily bitten between a valve body and a valve seat (not shown). For this reason, the foreign matter is removed by repeating the opening and closing operation of the bypass valve 28, and therefore, it is possible to eliminate the liquid flooding without requiring the service and inspection by a serviceman.
  • the control unit 51 stops the compressor 10 and issues an abnormality warning through the information unit 49.
  • the liquid flooding occurs due to the refrigerant which has not sufficiently evaporated in the outdoor heat exchanger 13 or the indoor heat exchanger 30 as an evaporator being returned through the suction pipe 22b, or the refrigerant which has not sufficiently evaporated in the supercooling heat exchanger 17 being returned through the suction pipe 22b.
  • the compressor 10 the air conditioner 1
  • the bypass pipe 27 having one end 27a connected to the outdoor-side liquid pipe 22c between the outdoor heat exchanger 13 and the indoor heat exchanger 30 and the other end 27b connected to the suction pipe 22b of the compressor 10, the bypass valve 28 that controls the flow of the refrigerant in the bypass pipe 27, the liquid flooding determination unit 53 that determines the presence or absence of the liquid flooding of the refrigerant to the compressor 10, and the bypass valve leakage determination unit 54 that determines whether or not the liquid flooding is caused by the leakage in the bypass valve 28, based on the suction superheat degree T3 of the refrigerant acquired further on the upstream side than the other end 27b of the bypass pipe 27 in the suction pipe 22b are provided, and therefore, it is possible to easily determine whether or not the liquid flooding to the compressor 10 is caused by the leakage in the bypass valve 28.
  • the liquid flooding determination unit 53 is configured to determine that the liquid flooding has occurred, in a case where at least one of the casing superheat degree T2 of the refrigerant acquired at the bottom portion of the casing 10A of the compressor 10 and the discharge superheat degree T1 of the refrigerant which is discharged from the compressor 10 is equal to or lower than the predetermined casing superheat degree reference value T2 S or the discharge superheat degree reference value T1 S determined in advance. Therefore, the presence or absence of the liquid flooding to the compressor 10 can be determined with a simple configuration.
  • the bypass pipe 27 is provided with the capillary 29 which is disposed between the other end 27b of the bypass pipe 27 and the bypass valve 28, the inlet temperature sensor 47 which is disposed between one end 27a of the bypass pipe 27 and the bypass valve 28, and the outlet temperature sensor 48 which is disposed between the other end 27b of the bypass pipe 27 and the capillary 29, and therefore, for example, even in a case where the liquid flooding has occurred due to the liquid refrigerant which has not completely evaporated in the outdoor heat exchanger 13, the presence or absence of the leakage in the bypass valve 28 can be accurately determined based on the comparison between the inlet/outlet temperature difference T4 detected by the inlet temperature sensor 47 and the outlet temperature sensor 48 and the inlet/outlet temperature difference reference value T4 S .
  • the control to repeatedly execute the opening and closing operation of the bypass valve 28 is performed, and therefore, in a case where the cause of the leakage in the bypass valve 28 is temporary foreign matter biting, the foreign matter is removed by the opening and closing operation. For this reason, it is possible to easily eliminate the leakage in the bypass valve 28.
  • the operation of the compressor 10 is stopped and the control to issue an abnormality warning through the information unit 49 is performed, and therefore, it is possible to perform the service and inspection of the refrigeration cycle device while preventing damage to the compressor 10.
  • the air conditioner 1 has been described as an example of the refrigeration cycle device.
  • the refrigeration cycle device may be a refrigeration device which is disposed in a freezing storage warehouse, as long as it has a heat exchanger functioning as an evaporator and a condenser.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Conditioning Control Device (AREA)
EP16885082.4A 2016-01-14 2016-12-12 Dispositif à cycles de réfrigération et procédé de commande pour déterminer des fuites dans la soupape de dérivation du dispositif à cycles de réfrigération Active EP3361190B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2016005401A JP6590706B2 (ja) 2016-01-14 2016-01-14 冷凍サイクル装置、及び、冷凍サイクル装置のバイパス弁漏れ判定制御方法
PCT/JP2016/086936 WO2017122479A1 (fr) 2016-01-14 2016-12-12 Dispositif à cycles de réfrigération et procédé de commande pour déterminer des fuites dans la soupape de dérivation du dispositif à cycles de réfrigération

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US11828507B2 (en) 2018-09-25 2023-11-28 Hangzhou Sanhua Research Institute Co., Ltd. Air conditioning system and control method therefor
CN110953699B (zh) * 2018-09-26 2021-05-18 杭州三花研究院有限公司 一种空调系统及其控制方法
JP6793862B1 (ja) * 2020-01-14 2020-12-02 三菱電機株式会社 冷凍サイクル装置
WO2022168238A1 (fr) * 2021-02-04 2022-08-11 三菱電機株式会社 Unité de source thermique froide et dispositif à cycle frigorifique
JP2023158274A (ja) * 2022-04-18 2023-10-30 三菱重工サーマルシステムズ株式会社 空気調和機、空調システム、および判定方法

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JPS5517017A (en) * 1978-07-20 1980-02-06 Tokyo Shibaura Electric Co Air balancing apparatus
JPH04324066A (ja) * 1991-04-23 1992-11-13 Daikin Ind Ltd 冷凍装置
JP3242214B2 (ja) * 1993-07-05 2001-12-25 東芝キヤリア株式会社 冷媒加熱式空気調和機
JP2006078090A (ja) * 2004-09-09 2006-03-23 Sanden Corp 冷凍装置
JP4705878B2 (ja) * 2006-04-27 2011-06-22 ダイキン工業株式会社 空気調和装置
JP2008112322A (ja) * 2006-10-31 2008-05-15 Matsushita Electric Ind Co Ltd 自動販売機の制御装置
JP2008281317A (ja) * 2007-05-14 2008-11-20 Denso Corp 空調装置
JP4926098B2 (ja) * 2008-03-14 2012-05-09 三菱電機株式会社 冷凍装置
DK2491318T3 (en) * 2009-10-23 2018-06-25 Carrier Corp PARAMETER CONTROL IN TRANSPORT COOLING SYSTEM AND PROCEDURES
EP2905563B1 (fr) * 2012-08-27 2021-09-15 Daikin Industries, Ltd. Système de réfrigération
EP2941604B1 (fr) * 2012-12-27 2018-09-05 Thermo King Corporation Procédé permettant de réduire l'engorgement de liquide dans une unité de réfrigération de transport

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EP3361190B1 (fr) 2019-07-10
JP6590706B2 (ja) 2019-10-16
CN108291757A (zh) 2018-07-17
ES2741278T3 (es) 2020-02-10
EP3361190A4 (fr) 2018-10-31
WO2017122479A1 (fr) 2017-07-20
JP2017125654A (ja) 2017-07-20

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