CN105308395B - Refrigerating plant - Google Patents

Refrigerating plant Download PDF

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Publication number
CN105308395B
CN105308395B CN201380077559.8A CN201380077559A CN105308395B CN 105308395 B CN105308395 B CN 105308395B CN 201380077559 A CN201380077559 A CN 201380077559A CN 105308395 B CN105308395 B CN 105308395B
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CN
China
Prior art keywords
evaporator
operation mode
pressure fan
refrigerant
compressor
Prior art date
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Active
Application number
CN201380077559.8A
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Chinese (zh)
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CN105308395A (en
Inventor
杉本猛
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Classifications

    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F25B2600/025—Compressor control by controlling speed
    • F25B2600/0251—Compressor control by controlling speed with on-off operation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/11—Fan speed control
    • F25B2600/111—Fan speed control of condenser fans
    • 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
    • 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
    • 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
    • F25B2700/2117—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
    • 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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Fluid Mechanics (AREA)
  • Thermal Sciences (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

Refrigerating plant (1) is characterised by possessing：Compressor (10), condenser (20), throttling arrangement (30) and evaporator (40) are connected and make the refrigerant loop of refrigerant circulation；The evaporator for the air stream that generation is blown out into freezer 80 by evaporator (40) is with pressure fan (41)；And at least control compressor (10) and the control unit (60) of evaporator pressure fan (41), as refrigerant, using R32 refrigerants, mix refrigerant of the percentage by weight more than 65% of the refrigerant containing R32, HFO refrigerants, propane or mix refrigerant containing propane, control unit (60) is able to carry out the air-supply operation mode for making cooling operation mode of both operating of compressor (10) and evaporator pressure fan (41) and stopping compressor (10) and operating evaporator pressure fan 41.

Description

Refrigerating plant
Technical field
The present invention relates to refrigerating plant.
Background technology
In patent document 1, a kind of cooling device is described, it possesses：Main body cover, the main body cover house evaporator With the pressure fan of the evaporator that makes the evaporator air mover, also, as there is blow-off outlet corresponding with pressure fan in front surface wall Fan guard form；Multiple wire rods are combined and formed by fan guard, the fan guard, and to cover the front of blow-off outlet Mode be installed on fan guard；And drain pan, the drain pan is configured at the lower section of main body cover, and receives and carry out flash-pot Condensed water.From the refrigerant that the compressor being arranged at outside storehouse is sent to evaporator circulate, and in evaporator with air in storehouse Heat exchange is carried out, thus, refrigerant evaporates and returns to compressor side.When operating pressure fan, air is from suction inlet quilt in storehouse Suck in main body cover, and be cooled when passing through evaporator, the air being cooled is blown out forwards from blow-off outlet.
Citation
Patent document
Patent document 1:No. 3861240 publications of Japanese Patent No.
The content of the invention
The invention problem to be solved
In conventional air-conditioning device and refrigerating plant, the refrigerants such as R410A, R404A have been used.And in recent years, it is proposed that It is used as the replacement system instead of conventional refrigerant using micro- combustion property refrigerant such as the small R32 of the value of global warming potential (GWP) The scheme of cryogen.In using this slightly air-conditioning device and refrigerating plant of combustion property refrigerant, though refrigerant from indoor set ( It is unit cooler in refrigerating plant) the internal or refrigerant piping (communication pipe arrangement) that is connected with indoor set is logical to External leakage Refrigerant gas concentration will not rise in the case of often, therefore will not produce problem for security.For micro- combustion property gas, its Ignition energy required for igniting is very big, so if the gas concentration in air less will not then cause to light a fire.It is so micro- Even for combustion property gas in the case of freezer or freezer internal leakage, the possibility of igniting is also very small.That is, when micro- combustion The aperture of gas from evaporator (heat exchanger) slowly leaks, the situation small to the leakage rate of freezer or freezer internal leakage Under, even if into freezer or freezer or will not also being risen to room external diffusion, gas concentration, will not light a fire.Separately Outside, in the operating of freeze cycle, the air in freezer or freezer is stirred by the pressure fan of evaporator, in gas velocity Spend bigger state.Therefore, even if refrigerant leaks, because the refrigerant that have leaked can spread, therefore also it is not up to hair Gas concentration as raw igniting.
However, in conventional refrigerating plant, when storehouse temperature becomes below setting, the operating of freeze cycle stops Only, and the pressure fan of evaporator also stops, and therefore, the stream condition in freezer or freezer is more stable shape State.If refrigerant leaks in this condition, the refrigerant that have leaked is difficult to spread.Therefore, when proportion is bigger than air Fluorinated refrigerant leakage in the case of, the refrigerant concentration of Near Ground is easier to rise.Thus, it is supposed that without appointing What fire-retardant countermeasure, then when the incendiary source for this strength for instantaneously sending the huge energy being not present under normal circumstances is located at In the case of Near Ground etc., there is the problem of leaving fraction of igniting.
The present invention is made to solve problem points as described above, and it is an object of the present invention to provide a kind of refrigerating plant, i.e., Refrigerant is set to be leaked from evaporator, the refrigerating plant also can further reduce the possibility of refrigerant igniting.
Means for solving the problems
The refrigerating plant of the present invention possesses：Refrigerant loop, the refrigerant loop fill compressor, condenser, throttling Put and connected with evaporator, and make refrigerant circulation；Evaporator pressure fan, the evaporator pass through the steaming with pressure fan generation Device is sent out to the air stream of cooling object space blowout；And control unit, the control unit at least control the compressor and described Evaporator pressure fan, as the refrigerant, using R32 refrigerants, the refrigerant containing R32 percentage by weight more than 65% Mix refrigerant, HFO refrigerants, propane or the mix refrigerant containing propane, the control unit is able to carry out the first operating Pattern and the second operation mode, first operation mode transport both the compressor and the evaporator pressure fan Turn, second operation mode stops the compressor, and the evaporator is operated with pressure fan.
The effect of invention
According to the present invention, due to can also make evaporator be operated with pressure fan when compressor stops, therefore, even if contingency Refrigerant leaks from evaporator, also evaporator can be utilized to be stirred with pressure fan to the air for cooling down object space.Therefore, Even if refrigerant leaks from evaporator, the refrigerant for being also capable of prevent leakage is detained, and can further reduce refrigerant igniting Possibility.
Brief description of the drawings
Fig. 1 is the refrigerant loop figure of the schematic configuration for the refrigerating plant 1 for representing embodiments of the present invention 1.
Fig. 2 is the compressor 10, cold for representing to be controlled by control unit 60 in the refrigerating plant 1 of embodiments of the present invention 1 The condenser timing diagram of one of the action of pressure fan 21 and evaporator pressure fan 41.
Fig. 3 is the compressor 10, cold for representing to be controlled by control unit 60 in the refrigerating plant 1 of embodiments of the present invention 1 The timing diagram of the condenser variation of the action of pressure fan 21 and evaporator pressure fan 41.
Fig. 4 is the refrigerant loop figure of the schematic configuration for the refrigerating plant 2 for representing embodiments of the present invention 2.
Fig. 5 is the compressor 10, cold for representing to be controlled by control unit 60 in the refrigerating plant 2 of embodiments of the present invention 2 Condenser pressure fan 21, magnetic valve 51 and the evaporator timing diagram of one of the action of pressure fan 41.
Embodiment
Embodiment 1.
Illustrate the refrigerating plant of embodiments of the present invention 1 below.Fig. 1 is the refrigerating plant 1 for representing present embodiment The refrigerant loop figure of schematic configuration.In the present embodiment, as refrigerating plant 1, enumerate and possess outdoor unit (heat source machine list Member) and indoor set (unit cooler) and make to illustrate exemplified by the cooling unit of holding low temperature in freezer.As shown in figure 1, Refrigerating plant 1 has compressor 10, condenser 20, throttling arrangement 30 and evaporator 40 with refrigerant piping according to such suitable The refrigerant loop that sequence is connected in series.As the refrigerant circulated in refrigerant loop, R32 refrigerant (unitary systems are used Cryogen) or the refrigerant containing R32 mix refrigerant of the percentage by weight more than 65%.In addition, as refrigerant, can also Use HFO refrigerants, propane or mix refrigerant containing propane.
Compressor 10 is that the refrigerant of low-temp low-pressure is sucked and compressed, and it is become the refrigerant of HTHP and discharge Fluid machinery.Compressor 10 is controlled by control unit 60 described later.Condenser 20 is to lead to the refrigerant discharged from compressor 10 Cross with the heat exchange of external fluid (such as air) to make the heat exchanger that it is condensed.Throttling arrangement 30 is to make to be condensed by condenser 20 The refrigerant decompression exapnsion part that turns into the gas-liquid two-phase cold-producing medium of low-temp low-pressure and flow out.As throttling arrangement 30, make With exapnsion valve or capillary etc..Evaporator 40 is to make to pass through the heat with air from the gas-liquid two-phase cold-producing medium that throttling arrangement 30 flows out The heat exchanger for exchanging and evaporating.At least compressor 10 and condenser 20 are contained in the outdoor unit (heat source machine unit) of refrigerating plant 1 It is interior.Evaporator 40 is contained in the indoor set (unit cooler) of refrigerating plant 1.Throttling arrangement 30 is contained in outdoor unit or interior In machine.
In addition, refrigerating plant 1 has to the condenser that condenser 20 is aerated pressure fan 21.Condenser pressure fan 21 are controlled by control unit 60 described later.The internal circulation of condenser 20 HTHP gas refrigerant by with by condensing The heat exchange for the air that device pressure fan 21 blows and be cooled and condense.
In addition, refrigerating plant 1 has to the evaporator that evaporator 40 is aerated pressure fan 41.Evaporator pressure fan 41 are controlled by control unit 60 described later.Evaporator is produced (cold by space of the evaporator 40 into freezer 80 with pressure fan 41 But one of object space) air stream that is blown.The system with the circulation in evaporator 40 is utilized by the air of evaporator 40 The heat exchange of cryogen and be cooled, turn into cold wind.By the cold front heavy rain in freezer 80.Detection storehouse is provided with freezer 80 The storehouse temperature sensor 42 of interior temperature.Storehouse temperature sensor 42 is by the information of the storehouse temperature detected to control described later Portion 60 exports.
Control unit 60 possesses CPU, ROM, RAM and input/output port etc..Control unit 60 is according to from storehouse temperature sensor Information of storehouse temperature of 42 inputs etc., to control compressor 10, condenser pressure fan 21, evaporator pressure fan 41 etc. Action.Control unit 60 is at least able to carry out cooling down operation mode and operation mode of blowing, the cooling operation mode make compressor 10 and evaporator with both pressure fan 41 operate, it is described air-supply operation mode stop compressor 10 and make evaporator air-supply Machine 41 operates.
Fig. 2 is the compressor 10 for representing to be controlled by control unit 60 in the refrigerating plant 1 of present embodiment, condenser is with sending Blower fan 21 and the evaporator timing diagram of one of the action of pressure fan 41.Fig. 2 (a) represents the change of storehouse temperature, Fig. 2 (b) The action (ON/OFF) of compressor 10 is represented, Fig. 2 (c) represents the action (ON/OFF) of condenser pressure fan 21, Fig. 2 (d) tables Show the action (ON/OFF) of evaporator pressure fan 41.In the original state of the timing diagram, compressor 10, condenser pressure fan 21 and evaporator with pressure fan 41 all in operating condition (ON).That is, in control unit 60, perform cooling in freezer 80 Cool down operation mode.As shown in Fig. 2 perform cool down operation mode when, blown from evaporator with pressure fan 41 into freezer 80 The air gone out is absorbed heat in evaporator 40, therefore storehouse temperature is gradually reduced.
When storehouse temperature is declined to become defined below lower limit temperature Tmin (Fig. 2 at the time of t1), control unit 60 makes pressure Contracting machine 10 and condenser pressure fan 21 stop (temperature sensor stopping).Now, control unit 60 does not make evaporator pressure fan 41 stop, but continue to operate (such as continuously running).That is, in control unit 60, air-supply operation mode is performed to replace Cool down operation mode.When performing air-supply operation mode, the air blowed from evaporator with pressure fan 41 into freezer 80 exists No longer absorbed heat in evaporator 40, therefore storehouse temperature is gradually increasing.
When storehouse temperature, which rises, turns into defined more than ceiling temperature Tmax (Tmax ＞ Tmin) (moment t2), control unit 60 make compressor 10 and condenser be operated again with pressure fan 21.And evaporator pressure fan 41 is set to continue to transport with keeping intact Turn.That is, in control unit 60, cooling operation mode is performed to replace operation mode of blowing.Thus, storehouse temperature is gradually reduced.
When storehouse temperature is declined to become defined below lower limit temperature Tmin (moment t3), control unit 60 makes compressor 10 Stop again with condenser pressure fan 21, and evaporator pressure fan 41 is remained in operation.That is, in control unit 60, perform Operation mode blow to replace cooling down operation mode.Then, similarly it is repeated according to storehouse temperature to compressor 10, cold The control of condenser pressure fan 21 and evaporator pressure fan 41.
As described above, the refrigerating plant 1 of present embodiment possesses compressor 10, condenser 20, throttling dress Put 30 and evaporator 40 connects and makes the refrigerant loop of refrigerant circulation, generation passes through evaporator 40 to cooling object space The evaporator for the air stream that (being the space in freezer 80 in this example) is blown controls compression with pressure fan 41 and at least The control unit 60 of machine 10 and evaporator pressure fan 41, as refrigerant, use the weight hundred of R32 refrigerants, the refrigerant containing R32 Divide than mix refrigerant, HFO refrigerants, propane or the mix refrigerant containing propane more than 65%, control unit 60 can Perform cooling operation mode and air-supply operation mode, the cooling operation mode make compressor 10 and evaporator pressure fan 41 this Both operatings, the air-supply operation mode stop compressor 10 and operate evaporator pressure fan 41.
According to the structure, due to that also can operate evaporator pressure fan 41 when compressor 10 stops, therefore even if Just in case refrigerant leaks from the refrigerant piping of evaporator 40, can also utilize evaporator pressure fan 41 in freezer 80 Air is stirred.Refrigerant thereby, it is possible to prevent leakage is detained, therefore, it is possible to further reduce refrigerant igniting Possibility, the higher refrigerating plant 1 of security can be obtained.
In addition, the refrigerating plant 1 of present embodiment is characterised by, be also equipped with detection cooling object space temperature ( Storehouse temperature in this example) and storehouse temperature sensor 42 from the information of the temperature detected to control unit 60 that export, when After cooling down below lower limit temperature Tmin as defined in being reduced at a temperature of object space is cooled down in the execution of operation mode, control unit 60 perform air-supply operation mode to replace cooling down operation mode, and work as and object space is cooled down in the execution of air-supply operation mode When temperature rises to defined more than ceiling temperature Tmax, control unit 60 performs cooling operation mode to replace operational mode of blowing Formula.
According to the structure, it can also make evaporator pressure fan when compressor 10 intermittently carries out temperature sensor stopping 41 continuously operate.Refrigerant therefore, it is possible to prevent leakage is detained, therefore, it is possible to further reduce refrigerant igniting Possibility, the higher refrigerating plant 1 of security can be obtained.
In addition, in the case where cooling object space is room, if made when the temperature sensor of compressor 10 stops Evaporator pressure fan 41 operates, then there is a situation where to bring unplessantness displeasure to the people in room.And in contrast to this, in this embodiment party It is freezer 80 that object space is cooled down in formula, therefore, evaporator is made when the temperature sensor of compressor 10 stops with sending Blower fan 41 is operated, and also the reserve in freezer 80 will not be impacted.
Herein, that refrigerating plant 1 stops for a long time being present.Exist in the long-term stopping of refrigerating plant 1 and come from The possibility that the refrigerant of evaporator 40 leaks, therefore, in the case where refrigerating plant 1 (compressor 10) stops, control Portion 60 can also perform the air-supply operation mode for only operating evaporator pressure fan 41.In addition, control unit 60 can also from The elapsed time that compressor 10 stops starting to calculate performs air-supply operation mode in the case of turning into more than the stipulated time.
Fig. 3 is the compressor 10 for representing to be controlled by control unit 60 in the refrigerating plant 1 of present embodiment, condenser is with sending The timing diagram of blower fan 21 and the evaporator variation of the action of pressure fan 41.Thick dashed line in Fig. 3 (d) represents to be evaporated device With the intermittent running of pressure fan 41.As shown in figure 3, in this variation, (in figure 3, it is during operation mode of blowing is performed During during untill moment t1 to moment t2 and after moment t3), the interval for being evaporated device pressure fan 41 is transported Turn.In the intermittent running, for example, the operating and the stopping of 3 minutes of 3 minutes is alternately repeated.According to this variation, energy Access and suppress this effect of the evaporator during operation mode of blowing is performed with the power consumption of pressure fan 41.
Embodiment 2.
Illustrate the refrigerating plant of embodiments of the present invention 2 below.Fig. 4 is the refrigerating plant 2 for representing present embodiment The refrigerant loop figure of schematic configuration.In addition, for the identical function of refrigerating plant 1 with embodiment 1 and effect Inscape, it is accompanied by identical reference and the description thereof will be omitted.
As shown in figure 4, the refrigerating plant 2 of present embodiment also has reservoir 50, magnetic valve 51 and suction pressure sensing Device 11, the reservoir are arranged at the downstream of condenser 20 and are the upstream sides of throttling arrangement 30, (the opening and closing of magnetic valve 51 One of valve) it is arranged at the downstream of reservoir 50 and is the upstream side of throttling arrangement 30, the suction pressure sensor 11 is set It is placed in the suction side of compressor 10.
Reservoir 50 is by the container of the liquid refrigerant storage flowed out from condenser 20.Reservoir 50, which has, for example can Store the volume of whole refrigerants in refrigerant loop.Magnetic valve 51 is opened and closed by the control of control unit 60, such as logical Turn into standard-sized sheet when electric and turn into when non-energized fully closed.Suction pressure sensor 11 detects the suction pressure of compressor 10, and will The information of the suction pressure detected exports to control unit 60.Control unit 60 is according to out of, storehouse temperature sensor 42 inputs storehouse The information of temperature and the information of suction pressure of compressor 10 etc. inputted from suction pressure sensor 11, control compressor 10, The action of condenser pressure fan 21, magnetic valve 51 and evaporator pressure fan 41.
Fig. 5 is the compressor 10 for representing to be controlled by control unit 60 in the refrigerating plant 2 of present embodiment, condenser is with sending Blower fan 21, magnetic valve 51 and the evaporator timing diagram of one of the action of pressure fan 41.Fig. 5 (a) represents the change of storehouse temperature Change, Fig. 5 (b) represents the change of suction pressure, and Fig. 5 (c) represents the action (ON/OFF) of compressor 10, and Fig. 5 (d) represents condenser With the action (ON/OFF) of pressure fan 21, Fig. 5 (e) represents the action (opening/closing) of magnetic valve 51, and Fig. 5 (f) represents evaporator with sending The action (ON/OFF) of blower fan 41.Under the timing diagram original state, compressor 10, condenser are used with pressure fan 21 and evaporator Pressure fan 41 is in open state all in operating condition (ON), magnetic valve 51.That is, in control unit 60, perform freezer 80 The cooling operation mode of interior cooling.As shown in figure 5, perform cool down operation mode when, from evaporator with pressure fan 41 to refrigeration The air being blown in storehouse 80 is absorbed heat in evaporator 40, and therefore, storehouse temperature is gradually reduced.
When storehouse temperature is declined to become defined below lower limit temperature Tmin (Fig. 5 at the time of t11), control unit 60 makes electricity Magnet valve 51 turns into closed state.And compressor 10, condenser is set all to keep intact ground with pressure fan 41 with pressure fan 21 and evaporator Remain in operation.When magnetic valve 51 turns into closed state, chilled liquid refrigerant is recovered in reservoir in condenser 20 In 50, the refrigerant amount to be circulated to throttling arrangement 30 and evaporator 40 is reduced, therefore, under the suction pressure of compressor 10 is gradual Drop.
When the suction pressure of compressor 10 is declined to become defined below pressure P0 (moment t12), control unit 60 makes pressure Contracting machine 10 and condenser pressure fan 21 stop, and evaporator pressure fan 41 is remained in operation (such as continuously running).That is, exist In control unit 60, air-supply operation mode is performed to replace cooling down operation mode.Herein, pressure P0 is set in evaporator 40 Hardly residual refrigerant, refrigerant are recovered in such value in reservoir 50.In addition, fortune of the evaporator with pressure fan 41 It can also be intermittent running to turn.
When storehouse temperature, which rises, turns into defined more than ceiling temperature Tmax (moment t13), control unit 60 makes magnetic valve 51 turn into open state, and compressor 10 and condenser is operated again with pressure fan 21.And protect evaporator pressure fan 41 Hold and remain in operation as former state.That is, in control unit 60, cooling operation mode is performed to replace operation mode of blowing.By making electricity Magnet valve 51 turns into open state, and thus, the refrigerant in reservoir 50 circulates to throttling arrangement 30 and evaporator 40, compressor 10 Suction pressure rises.
Then, when storehouse temperature, which reduces, turns into defined below lower limit temperature Tmin (moment t14), control unit 60 and when Carving t11 similarly makes magnetic valve 51 turn into closed state, and makes compressor 10, condenser with pressure fan 21 and evaporator pressure fan 41 remain in operation with keeping intact.In addition, when the suction pressure of compressor 10 reduces and turns into below pressure P0 (moment t15), Control unit 60 stops compressor 10 and condenser pressure fan 21 in the same manner as moment t12, and makes evaporator pressure fan 41 Remain in operation.Then, similarly it is repeated according to storehouse temperature and suction pressure to compressor 10, condenser pressure fan 21st, the control of magnetic valve 51 and evaporator pressure fan 41.
As described above, the refrigerating plant 2 of present embodiment is characterised by, is also equipped with being arranged at condenser 20 Downstream and be the reservoir 50 of the upstream side of throttling arrangement 30, be arranged at the downstream of reservoir 50 and be throttling arrangement 30 Upstream side and the suction pressure of compressor 10 and the magnetic valve 51 that is opened and closed and is detected simultaneously by the control of control unit 60 The suction pressure sensor 11 that the information of suction pressure is exported to control unit 60, in the execution of cooling operation mode, work as storehouse When interior temperature is dropped to below lower limit temperature Tmin, control unit 60 makes magnetic valve 51 turn into closed state, when turning into magnetic valve 51 When suction pressure is reduced to defined below pressure P0 after closed state, control unit 60 performs air-supply operation mode to replace cooling Operation mode.
According to the structure, due to that can turn into when compressor 10 stops in evaporator 40 almost without the shape of refrigerant State, therefore, even if just in case refrigerant leaks from the refrigerant piping of evaporator 40, it can also make the leakage rate of refrigerant turn into micro- Amount.Further, since with utilizing air of the evaporator in the stirring freezer 80 of pressure fan 41, therefore energy in the same manner as embodiment 1 The refrigerant for reaching prevent leakage is detained.Therefore, according to present embodiment, even if just in case refrigerant is from the refrigerant of evaporator 40 Pipe arrangement leaks, and also can further reduce the possibility of refrigerant igniting, can obtain the higher refrigerating plant 2 of security.
Other embodiment
The invention is not restricted to above-mentioned embodiment, but various modifications can be carried out.
For example, in the above-described embodiment, it will make to keep the cooling unit of low temperature as refrigerating plant in freezer 80 Example, but the present invention can also be applied to make to keep the freezing dress beyond the cooling unit and cooling unit of low temperature in freezer Put.
In addition, in the above-described embodiment, evaporator can also be made to carry out capability control with pressure fan 41 and (such as turned Speed control).For example, control unit 60 can also make evaporator pressure fan 41 with relatively low in the execution of air-supply operation mode Ability operates.For another example control unit 60 can also air-supply operation mode execution in make evaporator pressure fan 41 with than Cool down the low ability operating of the lowest capability that can be set in the execution of operation mode.
In addition, above-mentioned each embodiment and variation can be implemented in combination with one another.
The explanation of reference
1st, 2 refrigerating plants, 10 compressors, 11 suction pressure sensors, 20 condensers, 21 condenser pressure fan, 30 throttling arrangements, 40 evaporators, 41 evaporator pressure fan, 42 storehouse temperature sensors, 50, reservoir, 51 electromagnetism Valve, 60 control units, 80 freezers.

Claims (5)

1. a kind of refrigerating plant, it is characterised in that possess：
Refrigerant loop, the refrigerant loop connects compressor, condenser, throttling arrangement with evaporator, and makes refrigerant Circulation；
Evaporator pressure fan, the sky that the evaporator is blown out with pressure fan generation by the evaporator to cooling object space Air-flow；
Control unit, the control unit at least control the compressor and the evaporator pressure fan；
Temperature sensor, the temperature of the temperature sensor detection cooling object space, and the information of the temperature is defeated Go out to the control unit；
Reservoir, the reservoir are arranged on the downstream of the condenser and are the upstream sides of the throttling arrangement；
Open and close valve, the open and close valve are arranged on the downstream of the reservoir and are the upstream sides of the throttling arrangement, and by The control of the control unit is opened and closed；And
Pressure sensor, the pressure sensor detect the suction pressure of the compressor, and by the information of the suction pressure Export to the control unit,
As the refrigerant, R32 refrigerants, hybrid refrigeration of the percentage by weight more than 65% of the refrigerant containing R32 are used Any one among agent, HFO refrigerants, propane or mix refrigerant containing propane,
The control unit is able to carry out the first operation mode and the second operation mode, and first operation mode makes the compressor Operated with both evaporator pressure fan, second operation mode stops the compressor, and makes the evaporation Device is operated with pressure fan,
In the execution of first operation mode, when the temperature, which reduces, to be turned into below defined lower limit temperature, the control Portion processed makes the open and close valve turn into closed state, and the suction pressure is reduced to rule after the open and close valve is turned into closed state When below fixed pressure, the control unit performs the second operation mode to replace first operation mode,
In the execution of second operation mode, when the temperature, which rises, turns into more than defined ceiling temperature, the control Portion processed makes the open and close valve turn into open state, performs first operation mode to replace second operation mode.
2. refrigerating plant according to claim 1, it is characterised in that
Second operation mode is the operation mode for making the evaporator be continuously run with pressure fan.
3. refrigerating plant according to claim 1, it is characterised in that
Second operation mode is the operation mode for making the evaporator pressure fan intermittent running.
4. according to refrigerating plant according to any one of claims 1 to 3, it is characterised in that
In the case where the compressor stops, the control unit performs second operation mode.
5. according to refrigerating plant according to any one of claims 1 to 3, it is characterised in that
The cooling object space is the space in freezer or in freezer.
CN201380077559.8A 2013-06-18 2013-06-18 Refrigerating plant Active CN105308395B (en)

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GB2528215A (en) 2016-01-13
JP5968538B2 (en) 2016-08-10
WO2014203320A1 (en) 2014-12-24
CN105308395A (en) 2016-02-03
GB201519349D0 (en) 2015-12-16
JPWO2014203320A1 (en) 2017-02-23

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