WO2022091722A1 - 冷凍サイクル装置 - Google Patents
冷凍サイクル装置 Download PDFInfo
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- WO2022091722A1 WO2022091722A1 PCT/JP2021/036953 JP2021036953W WO2022091722A1 WO 2022091722 A1 WO2022091722 A1 WO 2022091722A1 JP 2021036953 W JP2021036953 W JP 2021036953W WO 2022091722 A1 WO2022091722 A1 WO 2022091722A1
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- flow path
- injection flow
- phase refrigerant
- refrigerant
- valve
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
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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
- F25B31/00—Compressor arrangements
- F25B31/006—Cooling of compressor or motor
- F25B31/008—Cooling of compressor or motor by injecting a liquid
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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
- F25B13/00—Compression machines, plants or systems, with reversible cycle
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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
- F25B25/00—Machines, plants or systems, using a combination of modes of operation covered by two or more of the groups F25B1/00 - F25B23/00
- F25B25/005—Machines, plants or systems, using a combination of modes of operation covered by two or more of the groups F25B1/00 - F25B23/00 using primary and secondary systems
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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
- F25B31/00—Compressor arrangements
- F25B31/002—Lubrication
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
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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
- F25B41/00—Fluid-circulation arrangements
- F25B41/40—Fluid line arrangements
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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
- F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
- F25B5/02—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in parallel
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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
- F25B6/00—Compression machines, plants or systems, with several condenser circuits
- F25B6/02—Compression machines, plants or systems, with several condenser circuits arranged in parallel
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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
- F25B2313/00—Compression machines, plants or systems with reversible cycle not otherwise provided for
- F25B2313/027—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means
- F25B2313/02741—Compression machines, plants or systems with reversible cycle not otherwise provided for characterised by the reversing means using one four-way valve
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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
- 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
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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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/19—Pressures
- F25B2700/193—Pressures of the compressor
- F25B2700/1931—Discharge pressures
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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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/19—Pressures
- F25B2700/193—Pressures of the compressor
- F25B2700/1933—Suction pressures
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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
- 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
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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
- 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
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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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/21—Temperatures
- F25B2700/2116—Temperatures of a condenser
- F25B2700/21162—Temperatures of a condenser of the refrigerant at the inlet of the condenser
Definitions
- the embodiment of the present invention relates to a refrigeration cycle apparatus.
- the refrigeration cycle device includes a compressor, a condenser, an expansion valve, and an evaporator as main elements. For example, during a heating operation or a heating operation, the refrigeration cycle device absorbs the heat of the outside air with an evaporator and supplies the heat to the indoor air or hot water with a condenser. At that time, as the outside air temperature rises, the amount of heat absorbed by the evaporator increases, and the temperature and pressure of the refrigerant sucked into the compressor rise. If the compressor becomes overheated along with this, the temperature of the discharged refrigerant of the compressor may rise excessively.
- Such an increase in the discharge refrigerant temperature may cause, for example, a decrease in the viscosity of the lubricating oil that lubricates the compression mechanism portion of the compressor, and damage the motor in the compressor. Therefore, various measures are taken to prevent such an increase in the discharge refrigerant temperature.
- One example is to add an injection flow path that guides a part of the liquid phase refrigerant to the compressor in the refrigerant circulation path.
- the injection flow path is connected between the condenser and the expansion valve in the circulation path, and includes a check valve, a two-way valve, an expansion valve (expansion valve for the injection flow path), and the like.
- a part of the liquid phase refrigerant that has passed through the condenser is injected into the cylinder chamber of the compressor, and the gas phase refrigerant sucked into the compressor is cooled by the liquid phase refrigerant. This prevents the compressor from becoming overheated.
- the opening / closing control of the circuit is performed according to, for example, the outside air temperature.
- the liquid phase refrigerant is sealed in the injection flow path (liquid sealed state).
- the outside air temperature ambient temperature
- the liquid-phase refrigerant expands in the injection flow path.
- the piping may be damaged between these valves in the liquid-sealed state depending on the degree of expansion. Therefore, when the injection flow path is provided, it is necessary to have a piping configuration that does not cause such a liquid-sealed state.
- the present invention has been made on the basis of this, and an object thereof is to provide a refrigerating cycle apparatus provided with an injection flow path capable of avoiding a liquid sealed state with relatively simple piping without complicating piping. To do.
- the refrigerating cycle apparatus divides a part of the liquid phase refrigerant into a compressor that discharges the gas phase refrigerant, a heat source side heat exchanger, a first expansion valve, a user side heat exchanger, and the user side heat exchanger. It is configured to include an injection flow path to be injected into the compressor, and includes a refrigerant circuit in which a refrigerant circulates.
- a solenoid valve, a check valve, and a second expansion valve are arranged in order from the upstream side in the flow direction of the liquid phase refrigerant in the injection flow path.
- the second expansion valve is not fully closed, but is stopped at an opening larger than that of the fully closed valve.
- FIG. 1 is a circuit diagram schematically showing a refrigerating cycle of a refrigerating cycle apparatus (air-cooled heat pump chilling unit) according to an embodiment.
- FIG. 2 is a control flow diagram at the time of opening / closing control of the injection flow path in the refrigeration cycle device (air-cooled heat pump chilling unit) according to the embodiment.
- FIG. 3 is a diagram schematically showing the flow of a part of the liquid phase refrigerant in a state where the injection flow path is opened in the cooling mode of the refrigerating cycle device (air-cooled heat pump chilling unit) according to the embodiment.
- FIG. 1 is a circuit diagram schematically showing a refrigerating cycle of a refrigerating cycle apparatus (air-cooled heat pump chilling unit) according to an embodiment.
- FIG. 2 is a control flow diagram at the time of opening / closing control of the injection flow path in the refrigeration cycle device (air-cooled heat pump chilling unit) according to the embodiment.
- FIG. 3 is a diagram schematically showing the flow
- FIG. 4 is a diagram schematically showing the flow of a part of the liquid phase refrigerant in a state where the injection flow path is opened in the heating mode of the refrigeration cycle device (air-cooled heat pump chilling unit) according to the embodiment.
- FIG. 5 is a diagram schematically showing the flow of a part of the liquid phase refrigerant in a state where the injection flow path is closed in the refrigeration cycle device (air-cooled heat pump chilling unit) according to the embodiment.
- FIG. 6 is a circuit diagram schematically showing a refrigerating cycle of another embodiment of the refrigerating cycle apparatus (air-cooled heat pump chilling unit) according to the embodiment.
- FIG. 1 is a circuit diagram showing a refrigeration cycle of an air-cooled heat pump chilling unit (hereinafter, simply referred to as a chilling unit) 1 according to an embodiment.
- the chilling unit 1 is an example of a refrigerating cycle device, and can be operated in a cooling mode and a heating mode, respectively.
- the refrigerating cycle device is not limited to the chilling unit 1 having a refrigerating cycle as shown in FIG. 1, and may be, for example, an air conditioner or a water-cooled heat source machine.
- the chilling unit 1 includes a refrigerating cycle unit 2, a water circuit unit 5, a control unit 7, and an operation unit 8.
- the refrigeration cycle unit 2 includes a compressor 20, a four-way valve 21, an air heat exchanger unit 22, a pair of expansion valves (first expansion valves) 23a and 23b, a receiver 24, and a water heat exchanger (utility side heat exchanger). 25. It is composed of a refrigerant circuit R including a gas-liquid separator 26 as a main element. Each of these elements of the refrigerant circuit R is connected via a main pipe 27 through which the refrigerant circulates.
- the compressor 20 has a variable capacity and discharges a high-temperature, high-pressure gas phase refrigerant from a discharge port.
- the discharge port of the compressor 20 is connected to the first port 21a of the four-way valve 21 via the discharge pipe 28.
- the discharge pipe 28 has a first temperature sensor (detection unit) T1 for detecting the temperature of the high temperature / high pressure gas phase refrigerant and a first temperature sensor (detection unit) T1 for detecting the pressure of the high temperature / high pressure vapor phase refrigerant discharged from the compressor 20.
- the pressure sensor P1 is provided.
- the second port 21b of the four-way valve 21 is connected to the air heat exchanger unit 22.
- the air heat exchanger unit 22 includes a pair of air heat exchangers 29a and 29b and a fan 30.
- the air heat exchangers 29a and 29b correspond to heat source side heat exchangers.
- the air heat exchangers 29a and 29b form an exhaust passage extending in the vertical direction with the shielding plate.
- the fan 30 is supported by a support member at the upper ends of the air heat exchangers 29a and 29b so as to be located at an exhaust port that opens at the upper end of the exhaust passage.
- outside air passes through the air heat exchangers 29a and 29b and is sucked into the exhaust passage.
- the outside air sucked into the exhaust passage is sucked up toward the exhaust port and is discharged above the air heat exchanger unit 22 from the exhaust port.
- the inlets of the air heat exchangers 29a and 29b are connected in parallel to the second port 21b of the four-way valve 21.
- Second temperature sensors T2 for detecting the temperature of the gas phase refrigerant flowing into the air heat exchangers 29a and 29b are provided near the inlets of the air heat exchangers 29a and 29b, respectively. It should be noted that such an inlet is an inflow port where the refrigerant flows into the air heat exchangers 29a and 29b in the cooling mode described later, and is an outlet (outlet of the air heat exchangers 29a and 29b) where the refrigerant flows out in the heating mode. Become.
- the outlets of the air heat exchangers 29a and 29b are connected to the pipes 41a and 41b having the expansion valves 23a and 23b.
- the pipes 41a and 41b merge with each other downstream of the expansion valves 23a and 23b and are connected to one collective pipe 42.
- the collecting pipe 42 is connected to the third port 21c of the four-way valve 21 via the receiver 24 and the water heat exchanger 25.
- the outlet is an outlet from which the refrigerant flows out from the air heat exchangers 29a and 29b in the cooling mode, which will be described later, and is an inlet (the inlet of the air heat exchangers 29a and 29b) into which the refrigerant flows in the heating mode. Become.
- the fourth port 21d of the four-way valve 21 is connected to the suction side of the compressor 20 via the gas-liquid separator 26.
- a third temperature sensor T3 for detecting the temperature of the gas-liquid two-phase refrigerant guided to the gas-liquid separator 26 is provided in the pipe 43 connecting the fourth port 21d of the four-way valve 21 and the inlet of the gas-liquid separator 26. Has been done.
- a second pressure sensor P2 for detecting the pressure of the low-temperature / low-pressure gas phase refrigerant sucked into the compressor 20 is provided in the pipe 44 connecting the outlet of the gas-liquid separator 26 and the suction side of the compressor 20. Has been done.
- a pipe 46 is provided between the gas-liquid separator 26 and the four-way valve 21.
- the pipe 46 connects the inlet of the gas-liquid separator 26 and the first port 21a of the four-way valve 21, and a normally closed solenoid valve 47 is provided in the middle of the pipe 46.
- the water heat exchanger 25 includes a refrigerant flow path 25a and a water flow path 25c.
- the refrigerant flow path 25a is connected to the collecting pipe 42 downstream of the receiver 24 in the cooling mode described later and upstream in the heating mode described later.
- the refrigerant circuit R includes an injection flow path 6.
- the injection flow path 6 is configured to include three flow paths (hereinafter, referred to as first to third injection flow paths) 6a, 6b, 6c.
- the first injection flow path 6a and the second injection flow path 6b are flow paths that branch the refrigerant circuit R, respectively.
- the third injection flow path 6c is a flow path where the first injection flow path 6a and the second injection flow path 6b meet.
- the first injection flow path 6a is a flow path of a high-pressure liquid-phase refrigerant that has condensed by exchanging heat with the outside air passing through the air heat exchangers 29a and 29b.
- One end of the first injection flow path 6a is connected between the air heat exchanger 29b and the expansion valve 23b.
- the first injection flow path 6a is piped between the air heat exchanger 29b and the expansion valve 23b, that is, on the downstream side of the air heat exchanger 29b and on the upstream side of the expansion valve 23b in the flow direction of the liquid phase refrigerant. It branches from 41b.
- the second injection flow path 6b is a flow path of a high-pressure liquid-phase refrigerant that has passed through the water heat exchanger 25 by exchanging heat with the water flowing through the water flow path 25c.
- One end of the second injection flow path 6b is connected between the water heat exchanger 25 and the receiver 24.
- the second injection flow path 6b is located between the water heat exchanger 25 and the receiver 24, that is, downstream of the water heat exchanger 25 in the flow direction of the liquid phase refrigerant and the receiver 24 (in other words, an expansion valve). It branches from the collective pipe 42 on the upstream side of 23a, 23b).
- the third injection flow path 6c is a flow path in which the first injection flow path 6a and the second injection flow path 6b merge to allow a high-pressure liquid-phase refrigerant to flow. That is, in the flow direction of the liquid phase refrigerant, the first injection flow path 6a and the second injection flow path 6b are arranged on the upstream side, and the third injection flow path 6c is arranged on the downstream side.
- One end of the third injection flow path 6c is connected to the other end of the first injection flow path 6a and the other end of the second injection flow path 6b, and the other end is connected to 20a to the injection port of the compressor 20. There is.
- the first injection flow path 6a is provided with a solenoid valve (hereinafter referred to as a cooling solenoid valve) 61a and a check valve (hereinafter referred to as a cooling check valve) 62a.
- the cooling solenoid valve 61a is arranged on the upstream side of the cooling check valve 62a in the flow direction of the liquid phase refrigerant in the first injection flow path 6a.
- the second injection flow path 6b is provided with a solenoid valve (hereinafter referred to as a heating solenoid valve) 61b and a check valve (hereinafter referred to as a check valve for heating) 62b.
- the heating solenoid valve 61b is arranged on the upstream side of the heating check valve 62b in the flow direction of the liquid phase refrigerant in the second injection flow path 6b.
- An expansion valve (second expansion valve) 60c is provided in the third injection flow path 6c.
- the expansion valve 60c is an electronic valve and is a valve closing-less valve.
- the valve closing-less valve has a valve structure in which the valve is not fully closed but is stopped at an opening larger than that of the fully closed (hereinafter referred to as a stop opening). That is, the expansion valve 60c is maintained in a state of being opened by the stop opening degree even in the stopped state, and does not block the flow of the liquid phase refrigerant.
- a high-pressure liquid-phase refrigerant that has passed through the first injection flow path 6a or the second injection flow path 6b flows into the third injection flow path 6c.
- the high-pressure liquid-phase refrigerant flowing into the third injection flow path 6c is depressurized in the process of passing through the expansion valve 60c, and is injected into the cylinder chamber from the injection port of the compressor 20.
- the water circuit unit 5 is a flow path of water that exchanges heat with a refrigerant in the water heat exchanger 25, and is provided with a water circulation pump 50 and first to third water pipes 51a, 51b, 51c as main elements.
- the water circulation pump 50 is, for example, a variable capacity type, in which the suction port is connected to one end of the first water pipe 51a and the discharge port is connected to one end of the second water pipe 51b.
- the other end of the first water pipe 51a is connected to the water outlet on the utilization equipment side of the chilling unit 1.
- the other end of the second water pipe 51b is connected to the inlet of the water flow path 25c of the water heat exchanger 25.
- the second water pipe 51b is provided with a third pressure sensor P3 for detecting water pressure and a fourth temperature sensor T4 for detecting water temperature.
- One end of the third water pipe 51c is connected to the outlet of the water flow path 25c, and the other end is connected to the water inlet on the utilization equipment side of the chilling unit 1.
- the third water pipe 51c is provided with a fourth pressure sensor P4 for detecting water pressure and a fifth temperature sensor T5 for detecting water temperature.
- the control unit 7 controls the operation of each element of the refrigeration cycle unit 2 and the water circuit unit 5, and controls the operation of the chilling unit 1.
- the control unit 7 includes a CPU, a memory, a storage device (nonvolatile memory), an input / output circuit, a timer, and the like, controls the operation of each element of the refrigeration cycle unit 2 and the water circuit unit 5, and controls the operation of the chilling unit 1. do.
- the control unit 7 has various information (data) necessary for the operation control of the chilling unit 1, such as operation start, operation stop, cooling operation and heating operation mode selection, refrigerant temperature and pressure, water temperature, and water pressure of the chilling unit 1. ).
- the control unit 7 controls the operation of each of the above elements, and starts the operation of the chilling unit 1, stops the operation, switches between the cooling operation and the heating operation, and injects the flow.
- the road 6 is opened and closed. Specifically, each operation such as operation / stop of the compressor 20, port switching of the four-way valve 21, expansion valves 23a and 23b, expansion valves 60c, cooling solenoid valve 61a, and opening / closing of the heating solenoid valve 61b is controlled. It is controlled by the unit 7.
- the operation unit 8 includes, for example, an operation panel, a switch, a button, a display for display, and the like, and is connected to the control unit 7 by wire or wirelessly.
- the operation unit 8 is an interface in which a predetermined operation is performed by the user, and for example, operation start of the chilling unit 1, mode selection of cooling operation and heating operation, setting operation such as water supply temperature is performed.
- the four-way valve 21 communicates with the first port 21a to the second port 21b and the third port 21c to the fourth port 21d, as shown by the solid line in FIG. Switch to communicate with.
- the compressor 20 operates, and the high-temperature, high-pressure gas-phase refrigerant is discharged from the compressor 20 to the discharge pipe 28.
- the high-temperature, high-pressure vapor-phase refrigerant discharged from the compressor 20 is guided to the air heat exchangers 29a and 29b via the four-way valve 21.
- the gas phase refrigerant guided to the air heat exchangers 29a and 29b exchanges heat with the outside air passing through the air heat exchangers 29a and 29b by the operation of the fan 30 and condenses, and changes into a high-pressure liquid phase refrigerant.
- the high-pressure liquid-phase refrigerant is depressurized in the process of passing through the expansion valves 23a and 23b, and changes to an intermediate-pressure gas-liquid two-phase refrigerant.
- the gas-liquid two-phase refrigerant is guided to the water heat exchanger 25 via the receiver 24.
- the gas-liquid two-phase refrigerant guided to the water heat exchanger 25 exchanges heat with the water flowing in the water flow path 25c. As a result, the water in the water flow path 25c becomes cold water by being deprived of latent heat. Cold water is supplied to the utilization equipment side from the third water pipe 51c.
- the low-temperature, low-pressure gas-liquid two-phase refrigerant that has passed through the water heat exchanger 25 is guided to the gas-liquid separator 26 via the four-way valve 21, and the gas-liquid separator 26 turns the liquid-phase refrigerant into the gas-phase refrigerant. Be separated.
- the gas phase refrigerant separated from the liquid phase refrigerant is sucked into the compressor 20 and becomes a high temperature / high pressure gas phase refrigerant again and is discharged from the compressor 20.
- the four-way valve 21 communicates with the first port 21a to the third port 21c and the second port 21b to the fourth port 21d, as shown by the broken line in FIG. Switch to communicate with.
- the high temperature / high pressure gas phase refrigerant compressed by the compressor 20 is guided to the water heat exchanger 25 via the four-way valve 21.
- the gas phase refrigerant guided to the water heat exchanger 25 and flowing through the refrigerant flow path 25a exchanges heat with the water flowing through the water flow path 25c.
- the water in the water flow path 25c is heated to become hot water.
- the hot water is supplied to the utilization equipment side from the third water pipe 51c.
- the high-pressure liquid-phase refrigerant that has passed through the water heat exchanger 25 changes to an intermediate-pressure gas-liquid two-phase refrigerant in the process of passing through the receiver 24 and the expansion valves 23a and 23b, and is guided to the air heat exchangers 29a and 29b. Be taken.
- the gas-liquid two-phase refrigerant guided to the air heat exchangers 29a and 29b exchanges heat with the outside air passing through the air heat exchangers 29a and 29b by the operation of the fan 30 and evaporates, resulting in low-temperature and low-pressure gas-liquid two-phase. It changes to a refrigerant.
- the low-temperature and low-pressure gas-liquid two-phase refrigerant that has passed through the air heat exchangers 29a and 29b is guided to the gas-liquid separator 26 via the four-way valve 21, and the liquid-phase refrigerant and the gas-phase refrigerant are guided by the gas-liquid separator 26. Is separated into.
- the gas phase refrigerant separated from the liquid phase refrigerant is sucked into the compressor 20 and becomes a high temperature / high pressure gas phase refrigerant again and is discharged from the compressor 20.
- FIG. 2 shows a control flow of the control unit 7 at the time of opening / closing control of the injection flow path 6.
- the control unit 7 controls the opening and closing of the injection flow path 6 as follows. In controlling the opening and closing of the injection flow path 6, the control unit 7 determines the operation mode of the chilling unit 1. As an example in the control flow of FIG. 2, the control unit 7 determines whether or not the operation mode of the chilling unit 1 is the cooling mode (S101). At that time, the control unit 7 receives, for example, a signal indicating the operation mode from the operation unit 8, and when the received signal is a cooling mode selection signal, the operation mode is the cooling mode, and the other signals. , It is determined that the operation mode is not the cooling mode.
- the control unit 7 When the operation mode is the cooling mode, the control unit 7 operates the chilling unit 1 in the cooling mode (S102). In this case, the control unit 7 controls the operation of the four-way valve 21 to communicate the first port 21a and the second port 21b, and communicate the third port 21c and the fourth port 21d to operate the compressor 20.
- the open path condition is a condition for determining whether or not to open the injection flow path 6.
- the open passage condition is determined according to whether or not the temperature (Td) of the refrigerant discharged from the compressor 20 is equal to or lower than the predetermined temperature (T0).
- the temperature of the refrigerant discharged from the compressor 20 (hereinafter referred to as the discharged refrigerant temperature Td) is the temperature of the refrigerant detected by the first temperature sensor T1.
- the predetermined temperature (hereinafter referred to as the reference temperature T0) is a threshold value for determining whether or not the discharged refrigerant temperature Td has risen excessively, or in short, whether or not the compressor 20 is in an overheated state.
- the value of the reference temperature T0 is defined in advance according to, for example, the performance of the compressor 20, is stored in the storage device of the control unit 7, and is read out to the memory as a parameter when determining the open path condition.
- the value of the reference temperature T0 is assumed to be about 100 ° C., but the value is not limited to such a value.
- the reference temperature T0 may be a fixed value, or may be a variable value that fluctuates according to, for example, a set water supply temperature.
- the control unit 7 acquires the detected value of the discharged refrigerant temperature Td from the first temperature sensor T1 and compares the acquired value with the reference temperature T0. When the discharge refrigerant temperature Td exceeds the reference temperature T0 (Td> T0), the control unit 7 determines that the open path condition is satisfied, and when the discharge refrigerant temperature Td is the reference temperature T0 or less (Td ⁇ T0). , It is determined that the open road condition is not satisfied.
- the control unit 7 closes the injection flow path 6.
- the control unit 7 closes the cooling solenoid valve 61a of the first injection flow path 6a and closes the heating solenoid valve 61b of the second injection flow path 6b (S104).
- the control unit 7 closes the valve.
- the control unit 7 maintains this state.
- the control unit 7 puts the expansion valve 60c in a stopped state (S104). For example, when the expansion valve 60c is not in the stopped state, the control unit 7 puts the expansion valve 60c in the stopped state. On the other hand, when the expansion valve 60c is in the stopped state, the control unit 7 maintains this state.
- the control unit 7 opens the injection flow path 6.
- the control unit 7 opens the cooling solenoid valve 61a of the first injection flow path 6a and closes the heating solenoid valve 61b of the second injection flow path 6b (S105).
- the control unit 7 opens it.
- the control unit 7 maintains this state.
- the control unit 7 maintains this state when the heating solenoid valve 61b is closed, and closes the heating solenoid valve 61b when it is open.
- the control unit 7 opens (opens) the expansion valve 60c (S105).
- the expansion valve 60c is in the stopped state
- the control unit 7 opens it.
- the expansion valve 60c is open, the control unit 7 maintains this state.
- the control unit 7 appropriately adjusts the opening degree of the expansion valve 60c.
- FIG. 3 shows a state in which the injection flow path 6 is opened in the cooling mode in this way.
- a part of the liquid phase refrigerant diverges from the pipe 41b, passes through the first injection flow path 6a, passes through the third injection flow path 6c, and the compressor 20. Is injected into the cylinder chamber (not shown).
- the control unit 7 determines whether or not the operation mode of the chilling unit 1 is the heating mode (S106). At that time, the control unit 7 receives, for example, a signal indicating the operation mode from the operation unit 8, and when the received signal is a selection signal of the heating mode, the operation mode is the heating mode and is a signal other than that. , It is determined that the operation mode is not the heating mode.
- the control unit 7 When the operation mode is the heating mode, the control unit 7 operates the chilling unit 1 in the heating mode (S107). In this case, the control unit 7 controls the operation of the four-way valve 21 to communicate the first port 21a and the third port 21c, and communicate the second port 21b and the fourth port 21d to operate the compressor 20.
- control unit 7 determines the conditions for whether or not the route can be opened (S108). In determining the open path condition, the control unit 7 acquires the detected value of the discharged refrigerant temperature Td from the first temperature sensor T1 and compares the acquired value with the reference temperature T0.
- the control unit 7 closes the injection flow path 6.
- the control unit 7 closes the cooling solenoid valve 61a of the first injection flow path 6a and closes the heating solenoid valve 61b of the second injection flow path 6b (S104). Further, the control unit 7 puts the expansion valve 60c in a stopped state (S104).
- the control of the control unit 7 in this case is the same as when the operation mode is the cooling mode.
- the control unit 7 opens the injection flow path 6.
- the control unit 7 closes the cooling solenoid valve 61a of the first injection flow path 6a and opens the heating solenoid valve 61b of the second injection flow path 6b (S109).
- the control unit 7 opens it.
- the control unit 7 maintains this state.
- the control unit 7 maintains this state when the cooling solenoid valve 61a is closed, and closes the cooling solenoid valve 61a when it is open.
- the control unit 7 opens (opens) the expansion valve 60c (S109).
- the control of the control unit 7 in this case is the same as when the operation mode is the cooling mode. Also in this case, the control unit 7 appropriately adjusts the opening degree of the expansion valve 60c.
- FIG. 4 shows a state in which the injection flow path 6 is opened in the heating mode in this way.
- a part of the liquid phase refrigerant diverges from the collecting pipe 42, passes through the second injection flow path 6b, and passes through the third injection flow path 6c to the compressor. It is injected into 20 cylinder chambers (not shown).
- the control unit 7 determines the operation stop condition of the chilling unit 1 (S110). Further, when the injection flow path 6 is opened in S105 or S109, the control unit 7 determines the operation stop condition of the chilling unit 1 (S110).
- the operation stop condition is a determination condition for whether or not to stop the operation of the chilling unit 1, and is determined according to, for example, whether or not the control unit 7 has received a signal indicating that the chilling unit 1 has been stopped.
- the signal indicating the stop of operation is transmitted, for example, when the operation stop is selected in the operation unit 8.
- control unit 7 determines whether or not the operation mode of the chilling unit 1 is the cooling mode (S101), and selectively performs the subsequent processing (S102 to S109) according to the determination result. Repeat to. On the other hand, when the operation stop condition is satisfied, the control unit 7 stops the operation of the chilling unit 1 (S111).
- the control unit 7 stops the operation of the chilling unit 1.
- the chilling unit 1 is not operated in either the cooling mode or the heating mode (for example, an error state)
- the operation of the chilling unit 1 is stopped in preparation for an unexpected situation.
- the control unit 7 may execute a predetermined abnormality process. For example, by lighting (blinking) a warning light, sounding a warning sound, displaying a warning message, etc., it is possible to thoroughly inform the error state.
- the liquid phase refrigerant in the injection flow path 6 can be flowed as follows.
- FIG. 5 shows a state in which the injection flow path 6 is closed in this way.
- the liquid phase refrigerant flowing into the injection flow path 6 stays in the target flow path X as shown in FIG.
- the target flow path X is, in the injection flow path 6, the cooling check valve 62a of the first injection flow path 6a, the heating check valve 62b of the second injection flow path 6b, and the third injection flow path 6c. It is a flow path defined by the expansion valve 60c of the above.
- the expansion valve 60c is in a state of being opened by the stop opening even if it is in a stopped state. Therefore, as shown by the white arrow in FIG. 5, the liquid phase refrigerant in the target flow path X is in a state of being able to flow toward the cylinder chamber (not shown) of the compressor 20 through the expansion valve 60c. ing. That is, the liquid phase refrigerant only temporarily stays in the target flow path X and is not blocked in the target flow path X. Therefore, when the injection flow path 6 is opened and then closed, it is possible to prevent the liquid phase refrigerant flowing into the injection flow path 6 from being in a liquid-sealed state.
- the injection flow path 6 is a first injection flow path 6a that injects a part of the liquid phase refrigerant into the compressor 20 when the chilling unit 1 is operated in the cooling mode, and is operated in the heating mode. It is branched into a second injection flow path 6b for injecting a part of the liquid phase refrigerant into the compressor 20. Therefore, regardless of whether the chilling unit 1 is operated in the cooling mode or the heating mode, it is possible to avoid the liquid-sealed state of the liquid-phase refrigerant in the target flow path X of the injection flow path 6.
- the injection flow path 6 is provided without providing a bypass flow path or the like for avoiding the liquid sealing state in the injection flow path 6, and the liquid of the liquid phase refrigerant in the target flow path X is provided.
- a relatively simple pipe it is possible to save space in the injection flow path 6.
- relatively simple piping it is possible to reduce costs or reduce the risk of refrigerant leakage due to vibration.
- either one of the solenoid valves 61a and 61b is closed.
- the other can be opened to perform liquid injection operation.
- the check valves 62a and 62b can prevent the backflow of the liquid phase refrigerant in the injection flow paths 6a and 6b due to defects of the solenoid valves 61a and 61b, so that stable liquid injection operation can be achieved and the refrigeration cycle can be achieved. The operation can be stabilized.
- the solenoid valves 61a and 61b used as two-way valves may flow backward when a pressure opposite to the predetermined forward flow path is applied depending on the form and quality of the solenoid valves, but downstream of the respective solenoid valves 61a and 61b.
- check valves 62a and 62b on the side respectively, liquid injection operation is performed in one of the injection flow paths 6a and 6b, and the liquid injection operation is performed in the other injection flow path connected in parallel with one flow path. Backflow due to the pressure difference can be prevented, and stable refrigeration cycle operation can be performed.
- the flow is controlled by the solenoid valves 61a and 61b for the pressure in the forward direction, and the flow is controlled by the check valves 62a and 62b for the pressure in the reverse direction.
- the refrigeration cycle operation can be performed stably. Further, even when the liquid injection operation is stopped and restarted, the operation can be relatively stable.
- the refrigerating cycle unit 2 of the chilling unit 1 is configured to include one system of refrigerant circuits R, but the refrigerant circuits may be of a plurality of systems.
- FIG. 6 shows a configuration example of the chilling unit 10 (refrigerating cycle unit 2) including the four systems of refrigerant circuits RA, RB, RC, and RD as another embodiment of the present invention.
- Each configuration of the first refrigerant circuit RA, the second refrigerant circuit RB, the third refrigerant circuit RC, and the fourth refrigerant circuit RD is the same as the above-mentioned refrigerant circuit R, and has elements common to the refrigerant circuit R. Each has.
- the water heat exchanger 25 includes a first refrigerant flow path 25a, a second refrigerant flow path 25b, and a water flow path 25c.
- the first refrigerant flow path 25a of the water heat exchanger 25 is connected to the collective pipe 42 of the first refrigerant circuit RA downstream in the cooling mode and upstream in the heating mode with respect to the receiver 24.
- the second refrigerant flow path 25b of the water heat exchanger 25 is connected to the collecting pipe 42 of the second refrigerant circuit RB. That is, the first refrigerant circuit RA and the second refrigerant circuit RB are connected in parallel to one water heat exchanger 25 and share the water heat exchanger 25.
- the third refrigerant circuit RC and the fourth refrigerant circuit RD are connected in parallel to one water heat exchanger 25 and share the water heat exchanger 25.
- the refrigerating cycle unit 2 of the chilling unit 10 includes two water heat exchangers 25.
- the water circuit unit 5 includes a water circulation pump 50 and first to fourth water pipes 51a, 51b, 51c, 51d as main elements.
- the first water pipe 51a is connected between the water outlet on the utilization equipment side of the chilling unit 10 and the suction port of the water circulation pump 50.
- the second water pipe 51b is connected between the discharge port of the water circulation pump 50 and the water flow path 25c of the water heat exchanger 25 of the first refrigerant circuit RA and the second refrigerant circuit RB.
- the second water pipe 51b is provided with a third pressure sensor P3 for detecting water pressure and a fourth temperature sensor T4 for detecting water temperature.
- the third water pipe 51c is a water heat exchange between the water flow path 25c of the water heat exchanger 25 of the first refrigerant circuit RA and the second refrigerant circuit RB, and the water heat exchange of the third refrigerant circuit RC and the fourth refrigerant circuit RD.
- the water flow path 25c of the vessel 25 is connected in series.
- the third water pipe 51c is provided with a fifth temperature sensor T5 for detecting the water temperature.
- the fourth water pipe 51d is connected between the water flow path 25c of the water heat exchanger 25 of the third refrigerant circuit RC and the fourth refrigerant circuit RD and the water inlet of the chilling unit 10 on the utilization equipment side. ..
- the fourth water pipe 51d is provided with a fourth pressure sensor P4 for detecting water pressure and a sixth temperature sensor T6 for detecting water temperature.
- control unit 7 controls the operation of each element of the refrigerating cycle unit 2 and the water circuit unit 5, and controls the operation of the chilling unit 10.
- the operation unit 8 is connected to the control unit 7 by wire or wirelessly, and for example, operation start of the chilling unit 10, mode selection of cooling operation and heating operation, setting operation such as water supply temperature is performed.
- the four-way valve 21 When the chilling unit 10 operates in the cooling mode, the four-way valve 21 has a second port 21a of the first to fourth refrigerant circuits RA, RB, RC, and RD, as shown by a solid line in FIG. It communicates with the port 21b and switches so that the third port 21c communicates with the fourth port 21d. Subsequent control is the same as when the chilling unit 1 is operated in the cooling mode. In the cooling mode, in this case, the water cooled by the water heat exchanger 25 shared by the first refrigerant circuit RA and the second refrigerant circuit RB is shared by the third refrigerant circuit RC and the fourth refrigerant circuit RD.
- the gas-liquid two-phase refrigerant flowing through the first refrigerant flow path 25a and the second refrigerant flow path 25b of the other water heat exchanger 25 It is cooled again by heat exchange.
- the cold water cooled in two stages is supplied to the utilization equipment side from the fourth water pipe 51d.
- the four-way valve 21 has the first port 21a of the first to fourth refrigerant circuits RA, RB, RC, RD as shown by the broken line in FIG. It communicates with the 3 port 21c and switches so that the 2nd port 21b communicates with the 4th port 21d. Subsequent control is the same as when the chilling unit 1 is operated in the heating mode.
- the water warmed by the water heat exchanger 25 shared by the first refrigerant circuit RA and the second refrigerant circuit RB is the other shared by the third refrigerant circuit RC and the fourth refrigerant circuit RD.
- first to fourth refrigerant circuits RA, RB, RC, and RD have the same injection flow path 6 as the chilling unit 1 (first injection flow path 6a, second injection flow path 6b, third injection). Each has a flow path 6c). Similar to the chilling unit 1, each injection flow path 6 is provided with a cooling solenoid valve 61a, a cooling check valve 62a, a heating solenoid valve 61b, a heating check valve 62b, and an expansion valve 60c, respectively. ..
- the target flow paths XA, XB, XC, and XD are provided only by providing the injection flow path 6 without providing the injection flow path 6 such as a bypass flow path for avoiding the liquid sealing state. It is possible to avoid liquid sealing of the liquid phase refrigerant.
- 1,10 ... Refrigerating cycle device air-cooled heat pump chilling unit
- 2 Refrigerating cycle unit
- 5 Water circuit unit
- 6 Bypass flow path (injection flow path)
- 6a First injection flow path
- 6b First 2 injection flow path
- 6c ... 3rd injection flow path
- 7 ... control unit, 8
- operation unit 20 ... compressor, 21 ... four-way valve, 22 ... air heat exchanger unit, 23a, 23b ... expansion valve ( 1st expansion valve), 24 ... receiver, 25 ... water heat exchanger, 25a, 25b ... refrigerant flow path, 25c ... water flow path, 26 ... gas-liquid separator, 27 ... main pipe, 28 ... discharge pipe, 29a, 29b ...
- Air heat exchanger, 30 Fan, 41a, 41b ... Piping, 42 ... Collective piping, 43, 44, 46 ... Piping, 47 ... Electromagnetic valve, 60c ... Expansion valve (second expansion valve), 61a ... Electromagnetic Valve (cooling electromagnetic valve), 61b ... Electromagnetic valve (heating electromagnetic valve), 62a ... Check valve (cooling check valve), 62b ... Check valve (heating check valve), R, RA, RB , RC, RD ... Refrigerant circuit, T1 ... First temperature sensor, X, XA, XB, XC, XD ... Target flow path.
Abstract
Description
図1は、実施形態に係る空冷式ヒートポンプチリングユニット(以下、単にチリングユニットという)1の冷凍サイクルを示す回路図である。チリングユニット1は、冷凍サイクル装置の一例であって、冷却モードおよび加熱モードでそれぞれ運転が可能である。なお、冷凍サイクル装置は、図1に示すような冷凍サイクルを有するチリングユニット1に限定されず、例えば空気調和機や水冷式熱源機などであってもよい。
冷凍サイクルユニット2は、圧縮機20、四方弁21、空気熱交換器部22、一対の膨張弁(第1の膨張弁)23a,23b、レシーバ24、水熱交換器(利用側熱交換器)25、気液分離器26を主たる要素として備えた冷媒回路Rにより構成されている。冷媒回路Rのこれらの各要素は、冷媒が循環する主配管27を介して接続されている。
ここで、インジェクション流路6a,6b,6cを介して液相冷媒を圧縮機20のシリンダ室内に注入して冷却するための運転を液インジェクション運転とする。
これに対し、運転停止条件が成立する場合、制御部7は、チリングユニット1の運転を停止する(S111)。
図6には、四系統の冷媒回路RA,RB,RC,RDを備えたチリングユニット10(冷凍サイクルユニット2)の構成例を本発明の別形態として示す。第1の冷媒回路RA、第2の冷媒回路RB、第3の冷媒回路RC、第4の冷媒回路RDの各構成は、上述した冷媒回路Rと同等であり、冷媒回路Rと共通する要素をそれぞれ備えている。
第1の水配管51aは、チリングユニット10の利用機器側の水出口と水循環ポンプ50の吸入口との間を接続している。
第2の水配管51bは、水循環ポンプ50の吐出口と第1の冷媒回路RAおよび第2の冷媒回路RBの水熱交換器25の水流路25cとの間を接続している。第2の水配管51bには、水圧を検出する第3の圧力センサP3および水温を検出する第4の温度センサT4が設けられている。
第4の水配管51dは、第3の冷媒回路RCおよび第4の冷媒回路RDの水熱交換器25の水流路25cとチリングユニット10の利用機器側の水入口との間を接続している。第4の水配管51dには、水圧を検出する第4の圧力センサP4および水温を検出する第6の温度センサT6が設けられている。
Claims (4)
- 気相冷媒を吐出する圧縮機と、熱源側熱交換器と、第1の膨張弁と、利用側熱交換器と、液相冷媒の一部を分流させて前記圧縮機に注入するインジェクション流路とを含んで構成され、冷媒が循環する冷媒回路を備え、
前記インジェクション流路には、該インジェクション流路における前記液相冷媒の流れ方向の上流側から順に電磁弁、逆止弁、第2の膨張弁が配置され、
前記第2の膨張弁は、全閉とはならず、全閉よりも大きな開度で停止状態となることを特徴とする
冷凍サイクル装置。 - 前記インジェクション流路は、前記冷媒回路をそれぞれ分岐する第1のインジェクション流路および第2のインジェクション流路と、前記第1のインジェクション流路および前記第2のインジェクション流路が合流する第3のインジェクション流路と、を含んで構成され、
前記第1のインジェクション流路は、前記熱源側熱交換器と前記第1の膨張弁との間で前記冷媒回路から分岐し、前記熱源側熱交換器が凝縮器として機能するとともに前記利用側熱交換器が蒸発器として機能する冷却運転時に、前記熱源側熱交換器を通過した前記液相冷媒の一部を分流させ、
前記第2のインジェクション流路は、前記利用側熱交換器と前記第1の膨張弁との間で前記冷媒回路から分岐し、前記熱源側熱交換器が蒸発器として機能するとともに前記利用側熱交換器が凝縮器として機能する加熱運転時に、前記利用側熱交換器を通過した前記液相冷媒の一部を分流させる
請求項1に記載の冷凍サイクル装置。 - 前記第1のインジェクション流路には、該第1のインジェクション流路における前記液相冷媒の流れ方向の上流側から順に冷却用電磁弁、冷却用逆止弁が配置され、
前記第2のインジェクション流路には、該第2のインジェクション流路における前記液相冷媒の流れ方向の上流側から順に加熱用電磁弁、加熱用逆止弁が配置され、
前記第3のインジェクション流路には、前記第2の膨張弁が配置されている
請求項2に記載の冷凍サイクル装置。 - 前記圧縮機から吐出される前記気相冷媒の温度を検出する検出部と、
前記圧縮機、前記第1の膨張弁、前記電磁弁、および前記第2の膨張弁の動作を制御する制御部と、をさらに備え、
前記制御部は、
前記冷却運転時において、前記検出部が検出した前記気相冷媒の温度が所定温度を超えている場合、前記冷却用電磁弁を開くとともに前記加熱用電磁弁を閉じ、前記第2の膨張弁を開き、
前記加熱運転時において、前記検出部が検出した前記気相冷媒の温度が所定温度を超えている場合、前記冷却用電磁弁を閉じるとともに前記加熱用電磁弁を開き、前記第2の膨張弁を開き、
前記冷却運転時および前記加熱運転時において、前記検出部が検出した前記気相冷媒の温度が所定温度を以下である場合、前記冷却用電磁弁を閉じるとともに前記加熱用電磁弁を閉じ、前記第2の膨張弁を前記停止状態とする
請求項3に記載の冷凍サイクル装置。
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Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0214964B2 (ja) | 1983-09-02 | 1990-04-10 | Nissan Motor | |
JPH04161760A (ja) * | 1990-10-25 | 1992-06-05 | Hitachi Ltd | 可逆形膨張弁を有する空冷ヒートポンプ式冷凍サイクル |
JPH1038389A (ja) * | 1996-07-18 | 1998-02-13 | Mitsubishi Heavy Ind Ltd | 冷凍装置 |
JP2010078165A (ja) * | 2008-09-24 | 2010-04-08 | Fujitsu General Ltd | 冷凍空調装置 |
JP2011075178A (ja) * | 2009-09-30 | 2011-04-14 | Fujitsu General Ltd | ヒートポンプサイクル装置 |
JP2011179783A (ja) * | 2010-03-03 | 2011-09-15 | Hitachi Appliances Inc | 冷凍装置 |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6514964B2 (ja) | 2015-06-03 | 2019-05-15 | 東芝キヤリア株式会社 | 冷凍サイクル装置 |
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2021
- 2021-10-06 WO PCT/JP2021/036953 patent/WO2022091722A1/ja unknown
- 2021-10-06 KR KR1020237014324A patent/KR20230074577A/ko unknown
- 2021-10-06 EP EP21885841.3A patent/EP4239262A1/en active Pending
- 2021-10-06 JP JP2022558958A patent/JPWO2022091722A1/ja active Pending
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0214964B2 (ja) | 1983-09-02 | 1990-04-10 | Nissan Motor | |
JPH04161760A (ja) * | 1990-10-25 | 1992-06-05 | Hitachi Ltd | 可逆形膨張弁を有する空冷ヒートポンプ式冷凍サイクル |
JPH1038389A (ja) * | 1996-07-18 | 1998-02-13 | Mitsubishi Heavy Ind Ltd | 冷凍装置 |
JP2010078165A (ja) * | 2008-09-24 | 2010-04-08 | Fujitsu General Ltd | 冷凍空調装置 |
JP2011075178A (ja) * | 2009-09-30 | 2011-04-14 | Fujitsu General Ltd | ヒートポンプサイクル装置 |
JP2011179783A (ja) * | 2010-03-03 | 2011-09-15 | Hitachi Appliances Inc | 冷凍装置 |
Also Published As
Publication number | Publication date |
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JPWO2022091722A1 (ja) | 2022-05-05 |
EP4239262A1 (en) | 2023-09-06 |
KR20230074577A (ko) | 2023-05-30 |
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