WO2014203320A1 - 冷凍装置 - Google Patents
冷凍装置 Download PDFInfo
- Publication number
- WO2014203320A1 WO2014203320A1 PCT/JP2013/066658 JP2013066658W WO2014203320A1 WO 2014203320 A1 WO2014203320 A1 WO 2014203320A1 JP 2013066658 W JP2013066658 W JP 2013066658W WO 2014203320 A1 WO2014203320 A1 WO 2014203320A1
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- WIPO (PCT)
- Prior art keywords
- operation mode
- refrigerant
- evaporator
- compressor
- blower
- Prior art date
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/65—Electronic processing for selecting an operating mode
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
- F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/40—Pressure, e.g. wind pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2140/00—Control inputs relating to system states
- F24F2140/10—Pressure
- F24F2140/12—Heat-exchange fluid pressure
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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
- F25B2400/16—Receivers
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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
- F25B2600/00—Control issues
- F25B2600/02—Compressor control
- F25B2600/025—Compressor control by controlling speed
- F25B2600/0251—Compressor control by controlling speed with on-off operation
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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
- F25B2600/00—Control issues
- F25B2600/11—Fan speed control
- F25B2600/111—Fan speed control of condenser fans
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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
- F25B2600/00—Control issues
- F25B2600/11—Fan speed control
- F25B2600/112—Fan speed control of evaporator fans
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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
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2513—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
- 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
- F25B2700/2117—Temperatures of an evaporator
- F25B2700/21171—Temperatures of an evaporator of the fluid cooled by the evaporator
- F25B2700/21173—Temperatures of an evaporator of the fluid cooled by the evaporator at the outlet
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Definitions
- the present invention relates to a refrigeration apparatus.
- Patent Document 1 combines a main body case composed of a fan cover that houses an evaporator and a blower for an evaporator that ventilates the evaporator, and a front wall has a blower outlet corresponding to the blower, and a plurality of wires.
- the cooling device is provided with a fan guard that is configured as described above and is attached to the fan cover so as to cover the front of the air outlet, and a drain pan that is disposed below the main body case and receives condensed water from the evaporator.
- the refrigerant sent from the compressor installed outside the warehouse flows, and in this evaporator, the refrigerant evaporates and returns to the compressor side by exchanging heat with the air in the warehouse. ing.
- the blower When the blower is operated, the internal air is sucked into the main body case from the suction port, cooled when passing through the evaporator, and the cooled air is blown forward from the blower outlet.
- the slightly flammable gas leaks into the refrigerator or freezer, the possibility of ignition is very small. That is, the slightly flammable gas is slowly leaked from the pinhole of the evaporator (heat exchanger), and if the leak rate into the refrigerator or freezer is low, it diffuses into the freezer or refrigerator or outdoors. However, the gas concentration does not increase and does not ignite. Further, during operation of the refrigeration cycle, the air in the refrigerator or freezer is agitated by the blower for the evaporator, and the air velocity is relatively high. Therefore, even if the refrigerant leaks, the leaked refrigerant diffuses, so that the gas concentration does not ignite.
- the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a refrigeration apparatus that can further reduce the possibility of ignition of the refrigerant even if the refrigerant leaks from the evaporator. To do.
- a refrigeration apparatus includes a refrigerant circuit in which a compressor, a condenser, a throttling device, and an evaporator are connected to circulate the refrigerant, and a flow of air that passes through the evaporator and is blown into a cooling target space An evaporator blower to be generated, and a control unit that controls at least the compressor and the blower for evaporator, and the refrigerant includes R32 refrigerant, a mixed refrigerant containing 65 wt% or more of R32 refrigerant, HFO refrigerant, propane, or A mixed refrigerant containing propane is used, and the control unit operates a first operation mode in which both the compressor and the evaporator blower are operated, and operates the evaporator blower by stopping the compressor.
- the second operation mode can be executed.
- the evaporator blower can be operated even when the compressor is stopped, the air in the space to be cooled is agitated by the evaporator blower even if the refrigerant leaks from the evaporator. can do. Therefore, even if the refrigerant leaks from the evaporator, the leaked refrigerant can be prevented from staying, and the possibility of ignition of the refrigerant can be further reduced.
- 4 is a timing chart showing an example of operations of the compressor 10, the condenser blower 21, and the evaporator blower 41 controlled by the control unit 60 in the refrigeration apparatus 1 according to Embodiment 1 of the present invention.
- 6 is a timing chart showing a modified example of operations of the compressor 10, the condenser blower 21, and the evaporator blower 41 controlled by the control unit 60 in the refrigeration apparatus 1 according to Embodiment 1 of the present invention.
- 6 is a timing chart showing an example of operations of the compressor 10, the condenser blower 21, the electromagnetic valve 51, and the evaporator blower 41 controlled by the control unit 60 in the refrigeration apparatus 2 according to Embodiment 2 of the present invention.
- FIG. 1 is a refrigerant circuit diagram illustrating a schematic configuration of a refrigeration apparatus 1 according to the present embodiment.
- a cooling unit that includes an outdoor unit (heat source unit) and an indoor unit (unit cooler) as the refrigeration apparatus 1 and keeps the inside of the refrigerator cold will be described as an example.
- the refrigeration apparatus 1 has a refrigerant circuit in which a compressor 10, a condenser 20, a throttling device 30, and an evaporator 40 are connected in series in this order by refrigerant piping.
- R32 refrigerant single refrigerant or a mixed refrigerant containing 65 wt% or more of R32 refrigerant is used.
- HFO refrigerant propane, or a mixed refrigerant containing propane may be used.
- the compressor 10 is a fluid machine that sucks and compresses a low-temperature and low-pressure refrigerant and discharges it as a high-temperature and high-pressure refrigerant.
- the compressor 10 is controlled by the control part 60 mentioned later.
- the condenser 20 is a heat exchanger that condenses the refrigerant discharged from the compressor 10 by heat exchange with an external fluid (for example, air).
- the expansion device 30 expands the refrigerant condensed in the condenser 20 under reduced pressure, and causes the refrigerant to flow out as a low-temperature low-pressure gas-liquid two-phase refrigerant.
- an expansion valve or a capillary is used as the expansion device 30.
- the evaporator 40 is a heat exchanger that evaporates the gas-liquid two-phase refrigerant flowing out from the expansion device 30 by heat exchange with air. At least the compressor 10 and the condenser 20 are accommodated in an outdoor unit (heat source unit) of the refrigeration apparatus 1. The evaporator 40 is accommodated in the indoor unit (unit cooler) of the refrigeration apparatus 1. The expansion device 30 is accommodated in an outdoor unit or an indoor unit.
- the refrigeration apparatus 1 has a condenser blower 21 that allows the condenser 20 to ventilate.
- the condenser blower 21 is controlled by the control unit 60 described later.
- the high-temperature and high-pressure gas refrigerant flowing through the condenser 20 is cooled and condensed by heat exchange with the air blown by the condenser blower 21.
- the refrigeration apparatus 1 has an evaporator blower 41 that allows the evaporator 40 to ventilate.
- the evaporator blower 41 is controlled by a control unit 60 described later.
- the evaporator blower 41 generates a flow of air that passes through the evaporator 40 and is blown into a space in the refrigerator 80 (an example of a space to be cooled).
- the air that has passed through the evaporator 40 is cooled by heat exchange with the refrigerant flowing through the evaporator 40 and becomes cold air.
- the inside of the refrigerator 80 is cooled by this cold air.
- an internal temperature sensor 42 for detecting the internal temperature is provided in the refrigerator 80.
- the internal temperature sensor 42 outputs information on the detected internal temperature to the control unit 60 described later.
- the control unit 60 includes a CPU, a ROM, a RAM, an input / output port, and the like.
- the controller 60 controls the operations of the compressor 10, the condenser blower 21, the evaporator blower 41, and the like based on the inside temperature information inputted from the inside temperature sensor 42.
- the control unit 60 can execute at least a cooling operation mode in which both the compressor 10 and the evaporator blower 41 are operated and a blow operation mode in which the compressor 10 is stopped and the evaporator blower 41 is operated.
- FIG. 2 is a timing chart showing an example of operations of the compressor 10, the condenser blower 21, and the evaporator blower 41 controlled by the control unit 60 in the refrigeration apparatus 1 according to the present embodiment.
- (A) of FIG. 2 represents the change of the internal temperature
- (b) represents the operation (ON / OFF) of the compressor 10
- (c) represents the operation (ON / OFF) of the condenser blower 21
- (D) represents the operation (ON / OFF) of the evaporator fan 41.
- the compressor 10 the condenser blower 21, and the evaporator blower 41 are all in an operating state (ON).
- a cooling operation mode for cooling the inside of the refrigerator 80 is executed.
- the air blown into the refrigerator 80 by the evaporator blower 41 is absorbed by the evaporator 40, so that the internal temperature gradually decreases.
- the control unit 60 stops the compressor 10 and the condenser blower 21 (thermo stop). At this time, the control unit 60 continues the operation (for example, continuous operation) without stopping the evaporator blower 41. That is, in the control unit 60, the air blowing operation mode is executed instead of the cooling operation mode.
- the air blowing operation mode is being executed, the air blown into the refrigerator 80 by the evaporator blower 41 is not absorbed by the evaporator 40, so the internal temperature gradually rises.
- the control unit 60 causes the compressor 10 and the condenser blower 21 to operate again.
- the operation of the evaporator blower 41 is continued as it is. That is, the control unit 60 executes the cooling operation mode instead of the air blowing operation mode. As a result, the internal temperature gradually decreases.
- the control unit 60 stops the compressor 10 and the condenser blower 21 again, and continues the operation of the evaporator blower 41. That is, in the control unit 60, the air blowing operation mode is executed instead of the cooling operation mode. Thereafter, the control of the compressor 10, the condenser blower 21 and the evaporator blower 41 based on the internal temperature is similarly repeated.
- the refrigeration apparatus 1 is connected to the compressor 10, the condenser 20, the expansion device 30, and the evaporator 40, and passes through the evaporator 40 and the refrigerant circuit that circulates the refrigerant. Then, an evaporator blower 41 that generates a flow of air blown into the space to be cooled (in this example, the space in the refrigerator 80), and a control unit 60 that controls at least the compressor 10 and the evaporator blower 41.
- the refrigerant used is an R32 refrigerant, a mixed refrigerant containing 65 wt% or more of R32 refrigerant, an HFO refrigerant, propane, or a mixed refrigerant containing propane, and the control unit 60 includes the compressor 10 and the blower 41 for the evaporator. It is possible to execute a cooling operation mode in which both of the above are operated, and a blowing operation mode in which the compressor 10 is stopped and the evaporator fan 41 is operated. That.
- the evaporator blower 41 can be operated even when the compressor 10 is stopped, even if the refrigerant leaks from the refrigerant pipe of the evaporator 40, the air in the refrigerator 80 Can be stirred by the evaporator blower 41. Thereby, since the leaked refrigerant can be prevented from staying, the possibility of ignition of the refrigerant can be further reduced, and the refrigeration apparatus 1 with higher safety can be obtained.
- the refrigeration apparatus 1 further includes an internal temperature sensor 42 that detects the temperature of the space to be cooled (in this example, the internal temperature) and outputs information on the detected temperature to the control unit 60.
- the controller 60 executes the blowing operation mode instead of the cooling operation mode after the temperature of the space to be cooled has dropped below the predetermined lower limit temperature Tmin during the execution of the cooling operation mode.
- the cooling operation mode is executed instead of the air blowing operation mode.
- the evaporator blower 41 can be continuously operated even when the compressor 10 is intermittently thermo stopped. Therefore, since the leaked refrigerant can be prevented from staying, the possibility of ignition of the refrigerant can be further reduced, and the refrigeration apparatus 1 with higher safety can be obtained.
- the space to be cooled is a living room
- operating the evaporator blower 41 when the compressor 10 is stopped may cause a person in the living room to feel uncomfortable.
- the space to be cooled is the refrigerator 80 in the present embodiment, even if the evaporator blower 41 is operated when the thermostat of the compressor 10 is stopped, the stored items in the refrigerator 80 are not affected.
- the refrigeration apparatus 1 may be stopped for a long time. Since the refrigerant leakage from the evaporator 40 may occur during the long-term stop of the refrigeration apparatus 1, the control unit 60 operates only the evaporator blower 41 when the refrigeration apparatus 1 (compressor 10) is stopped. You may make it perform ventilation operation mode. Moreover, you may make it the control part 60 perform a ventilation operation mode, when the elapsed time after the compressor 10 stops becomes more than predetermined time.
- FIG. 3 is a timing chart showing a modified example of the operations of the compressor 10, the condenser blower 21, and the evaporator blower 41 controlled by the control unit 60 in the refrigeration apparatus 1 according to the present embodiment.
- the thick broken line in FIG.3 (d) represents that the intermittent operation of the evaporator air blower 41 is performed.
- the evaporator blower 41 is intermittent during the period in which the air blowing operation mode is executed (the period from time t1 to time t2 and the period after time t3 in FIG. 3). Driving is performed. In this intermittent operation, for example, a 3-minute operation and a 3-minute stop are alternately repeated. According to this modification, the effect that the power consumption of the blower 41 for evaporators in the period when the ventilation operation mode is executed can be suppressed.
- FIG. 4 is a refrigerant circuit diagram illustrating a schematic configuration of the refrigeration apparatus 2 according to the present embodiment.
- symbol is attached
- the refrigeration apparatus 2 includes a liquid receiver 50 provided on the downstream side of the condenser 20 and on the upstream side of the throttle apparatus 30, and a throttle apparatus on the downstream side of the liquid receiver 50.
- 30 further includes an electromagnetic valve 51 (an example of an on-off valve) provided on the upstream side of 30 and a suction pressure sensor 11 provided on the suction side of the compressor 10.
- the liquid receiver 50 is a tank that stores the liquid refrigerant that has flowed out of the condenser 20.
- the liquid receiver 50 has a volume capable of storing all the refrigerant in the refrigerant circuit, for example.
- the electromagnetic valve 51 is opened and closed under the control of the control unit 60, and is fully opened when energized, for example, and fully closed when de-energized.
- the suction pressure sensor 11 detects the suction pressure of the compressor 10 and outputs information on the detected suction pressure to the control unit 60. Based on the information on the internal temperature input from the internal temperature sensor 42 and the information on the suction pressure of the compressor 10 input from the suction pressure sensor 11, the control unit 60 performs the compressor 10 and the condenser blower 21.
- the operations of the electromagnetic valve 51 and the evaporator blower 41 are controlled.
- FIG. 5 is a timing chart showing an example of operations of the compressor 10, the condenser blower 21, the electromagnetic valve 51, and the evaporator blower 41 controlled by the control unit 60 in the refrigeration apparatus 2 according to the present embodiment.
- 5A shows the change in the internal temperature
- FIG. 5B shows the change in the suction pressure
- FIG. 5C shows the operation (ON / OFF) of the compressor 10
- FIG. 5D shows the condenser blower.
- 21 represents the operation (ON / OFF) of FIG. 21
- (e) represents the operation (open / close) of the electromagnetic valve 51
- (f) represents the operation (ON / OFF) of the evaporator blower 41.
- the control unit 60 closes the electromagnetic valve 51.
- the compressor 10, the condenser blower 21, and the evaporator blower 41 are all continuously operated.
- the solenoid valve 51 is closed, the liquid refrigerant condensed in the condenser 20 is collected in the liquid receiver 50 and the amount of refrigerant flowing through the expansion device 30 and the evaporator 40 is reduced. Gradually decreases.
- the control unit 60 stops the compressor 10 and the condenser blower 21 and operates the evaporator blower 41 (for example, continuously). Continue driving). That is, in the control unit 60, the air blowing operation mode is executed instead of the cooling operation mode.
- the pressure P ⁇ b> 0 is set to a value such that almost no refrigerant remains in the evaporator 40 and the refrigerant is recovered in the liquid receiver 50.
- the operation of the evaporator blower 41 may be intermittent.
- the control unit 60 opens the electromagnetic valve 51 and causes the compressor 10 and the condenser blower 21 to operate again.
- the operation of the evaporator blower 41 is continued as it is. That is, the control unit 60 executes the cooling operation mode instead of the air blowing operation mode.
- the electromagnetic valve 51 is opened, the refrigerant in the liquid receiver 50 flows through the expansion device 30 and the evaporator 40, and the suction pressure of the compressor 10 increases.
- the control unit 60 closes the electromagnetic valve 51 in the same manner as time t11, and the compressor 10, the condenser blower 21, and the evaporation.
- the operation of the blower 41 for equipment is continued as it is.
- the control unit 60 stops the compressor 10 and the condenser blower 21 similarly to the time t12, and the evaporator blower 41 Continue driving. Thereafter, the control of the compressor 10, the condenser blower 21, the electromagnetic valve 51, and the evaporator blower 41 based on the internal temperature and the suction pressure is repeated in the same manner.
- the refrigeration apparatus 2 includes the liquid receiver 50 provided on the downstream side of the condenser 20 and the upstream side of the throttle apparatus 30, and the throttle apparatus on the downstream side of the liquid receiver 50.
- the control unit 60 closes the electromagnetic valve 51 when the internal temperature drops below the lower limit temperature Tmin during execution of the cooling operation mode, and after the electromagnetic valve 51 is closed, the suction pressure is set to a predetermined value. When the pressure drops below P0, the air blowing operation mode is executed instead of the cooling operation mode.
- the present invention is not limited to the above embodiment, and various modifications can be made.
- the cooling unit that keeps the inside of the refrigerator 80 cool is given as an example of the refrigeration apparatus.
- the present invention can also be applied to a cooling unit that keeps the inside of the freezer cold and a refrigeration apparatus other than the cooling unit.
- the evaporator blower 41 may be capable of capacity control (for example, rotation speed control).
- the control unit 60 may operate the evaporator blower 41 with a relatively low capacity during execution of the blow operation mode. Further, for example, the control unit 60 may cause the evaporator blower 41 to operate with a lower capacity than the minimum capacity that can be set during the execution of the cooling operation mode during the execution of the air blowing operation mode.
- Refrigeration device 1 Refrigeration device, 10 Compressor, 11 Suction pressure sensor, 20 Condenser, 21 Condenser blower, 30 Throttle device, 40 Evaporator, 41 Evaporator blower, 42 Inside temperature sensor, 50, Liquid receiver, 51 Solenoid valve, 60 control unit, 80 refrigerator.
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Fuzzy Systems (AREA)
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- Fluid Mechanics (AREA)
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- Devices That Are Associated With Refrigeration Equipment (AREA)
- Air Conditioning Control Device (AREA)
Abstract
Description
本発明の実施の形態1に係る冷凍装置について説明する。図1は、本実施の形態に係る冷凍装置1の概略構成を示す冷媒回路図である。本実施の形態では、冷凍装置1として、室外機(熱源機ユニット)と室内機(ユニットクーラ)とを備え、冷蔵庫内を保冷するクーリングユニットを例に挙げて説明する。図1に示すように、冷凍装置1は、圧縮機10、凝縮器20、絞り装置30及び蒸発器40が冷媒配管によってこの順に直列に接続された冷媒回路を有している。冷媒回路を循環させる冷媒としては、R32冷媒(単一冷媒)、又はR32冷媒を65重量%以上含む混合冷媒が用いられている。また、冷媒としては、HFO冷媒、プロパン、又はプロパンを含む混合冷媒が用いられていてもよい。
本発明の実施の形態2に係る冷凍装置について説明する。図4は、本実施の形態に係る冷凍装置2の概略構成を示す冷媒回路図である。なお、実施の形態1の冷凍装置1と同一の機能及び作用を有する構成要素については、同一の符号を付してその説明を省略する。
本発明は、上記実施の形態に限らず種々の変形が可能である。
例えば、上記実施の形態では、冷蔵庫80内を保冷するクーリングユニットを冷凍装置の例に挙げたが、本発明は、冷凍庫内を保冷するクーリングユニットや、クーリングユニット以外の冷凍装置にも適用できる。
Claims (7)
- 圧縮機、凝縮器、絞り装置及び蒸発器が接続されて、冷媒を循環させる冷媒回路と、
前記蒸発器を通過して冷却対象空間に吹き出される空気の流れを生成する蒸発器用送風機と、
少なくとも前記圧縮機及び前記蒸発器用送風機を制御する制御部と、を備え、
前記冷媒として、R32冷媒、R32冷媒を65重量%以上含む混合冷媒、HFO冷媒、プロパン、又はプロパンを含む混合冷媒が用いられるものであり、
前記制御部は、前記圧縮機及び前記蒸発器用送風機の双方を運転させる第1運転モードと、前記圧縮機を停止させて前記蒸発器用送風機を運転させる第2運転モードと、を実行可能であることを特徴とする冷凍装置。 - 前記冷却対象空間の温度を検出し、前記温度の情報を前記制御部に出力する温度センサをさらに備え、
前記制御部は、
前記第1運転モードの実行中において前記温度が所定の下限温度以下に低下したとき以降に、前記第1運転モードに代えて前記第2運転モードを実行し、
前記第2運転モードの実行中において前記温度が所定の上限温度以上に上昇したときに、前記第2運転モードに代えて前記第1運転モードを実行することを特徴とする請求項1に記載の冷凍装置。 - 前記凝縮器の下流側で前記絞り装置の上流側に設けられた受液器と、
前記受液器の下流側で前記絞り装置の上流側に設けられ、前記制御部の制御により開閉される開閉弁と、
前記圧縮機の吸入圧力を検出し、前記吸入圧力の情報を前記制御部に出力する圧力センサと、をさらに備え、
前記制御部は、前記第1運転モードの実行中において前記温度が前記下限温度以下に低下したときに前記開閉弁を閉状態とし、前記開閉弁を閉状態とした後に前記吸入圧力が所定の圧力以下に低下したときに、前記第1運転モードに代えて前記第2運転モードを実行することを特徴とする請求項2に記載の冷凍装置。 - 前記第2運転モードは、前記蒸発器用送風機を連続運転させる運転モードであることを特徴とする請求項1~請求項3のいずれか一項に記載の冷凍装置。
- 前記第2運転モードは、前記蒸発器用送風機を間欠運転させる運転モードであることを特徴とする請求項1~請求項3のいずれか一項に記載の冷凍装置。
- 前記制御部は、前記圧縮機が停止した場合に、前記第2運転モードを実行することを特徴とする請求項1~請求項5のいずれか一項に記載の冷凍装置。
- 前記冷却対象空間は、冷蔵庫内又は冷凍庫内の空間であることを特徴とする請求項1~請求項6のいずれか一項に記載の冷凍装置。
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CN201380077559.8A CN105308395B (zh) | 2013-06-18 | 2013-06-18 | 冷冻装置 |
PCT/JP2013/066658 WO2014203320A1 (ja) | 2013-06-18 | 2013-06-18 | 冷凍装置 |
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JP2002195707A (ja) * | 2000-12-22 | 2002-07-10 | Mitsubishi Electric Corp | 冷凍サイクル装置 |
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