WO2016203827A1 - Réfrigérateur et système de réfrigération - Google Patents

Réfrigérateur et système de réfrigération Download PDF

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Publication number
WO2016203827A1
WO2016203827A1 PCT/JP2016/061695 JP2016061695W WO2016203827A1 WO 2016203827 A1 WO2016203827 A1 WO 2016203827A1 JP 2016061695 W JP2016061695 W JP 2016061695W WO 2016203827 A1 WO2016203827 A1 WO 2016203827A1
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WIPO (PCT)
Prior art keywords
refrigerant
temperature
compressor
hfc
opening
Prior art date
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PCT/JP2016/061695
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English (en)
Japanese (ja)
Inventor
俊介 内田
Original Assignee
東芝キヤリア株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 東芝キヤリア株式会社 filed Critical 東芝キヤリア株式会社
Priority to JP2017524692A priority Critical patent/JP6500104B2/ja
Priority to SG11201710231YA priority patent/SG11201710231YA/en
Publication of WO2016203827A1 publication Critical patent/WO2016203827A1/fr
Priority to PH12017502278A priority patent/PH12017502278A1/en

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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
    • C09K5/02—Materials undergoing a change of physical state when used
    • C09K5/04—Materials undergoing a change of physical state when used the change of state being from liquid to vapour or vice versa
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • 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

Definitions

  • Embodiments of the present invention relate to a refrigerator and a refrigeration apparatus.
  • the compressor of the refrigerator generates heat when the refrigerant is compressed in the compressor. If the temperature of the compressor becomes too high, materials used for the compressor and oil (lubricating oil) in the compressor deteriorate. For this reason, cooling the compressor has been studied.
  • the apparatus which comprises a refrigeration cycle circuit independently is called refrigeration apparatus, and the apparatus (semi-finished product) which is not provided with an evaporator among refrigeration apparatuses is called a refrigerator.
  • an injection control method is known in which a liquid-phase refrigerant is continuously flowed little by little into a cylinder of the compressor.
  • a liquid-phase refrigerant in the cylinder is vaporized, heat of vaporization is taken from the compressor, and the compressor is cooled.
  • the gas-phase refrigerant is compressed by rotating the roller, for example. Oil is supplied into the cylinder to lubricate the roller with respect to the cylinder.
  • a refrigerator filled with (filled with) R404A as a refrigerant is known as a refrigerator connected to a store showcase or the like having an evaporator.
  • R404A has a relatively high GWP (Global Warming Potential) of 3,920.
  • GWP Global Warming Potential
  • coolant which has low GWP and is substituted for R404A is examined.
  • a mixed refrigerant containing HFC-32, HFC-125, HFC-134a, and HFO-1234yf (hereinafter also referred to as a mixed refrigerant containing HFC-32) has been studied. Yes.
  • the values of GWP are 675 for HFC-32, 3,500 for HFC-125, 1,430 for HFC-134a, and 4 for HFO-1234yf.
  • the mixed refrigerant containing HFC-32 or the like tends to have a higher temperature of the refrigerant discharged from the compressor than R404A. For this reason, in order to cool a compressor, it is necessary to increase the quantity of the refrigerant
  • the problem to be solved by the present invention is to provide a refrigerator that suppresses abnormal heat generation of the compressor, suppresses poor lubrication of the compressor, and suppresses a decrease in reliability, and a refrigeration apparatus including the refrigerator. is there.
  • the refrigerator of the embodiment includes a compressor, a condenser, a main pipe, a bypass pipe, an opening / closing mechanism, a temperature measuring unit, and a control unit.
  • the main pipe has a first end and a second end.
  • the main pipe sequentially connects the first end, the compressor, the condenser, and the second end.
  • the bypass pipe connects the compressor and the portion of the main pipe between the condenser and the second end.
  • the opening / closing mechanism is provided in the bypass pipe. The opening / closing mechanism switches between an open state in which the refrigerant flows in the bypass pipe and a closed state in which the refrigerant does not flow in the bypass pipe, and throttles the refrigerant in the open state.
  • the temperature measuring unit measures the temperature of the refrigerant discharged from the compressor.
  • the control unit controls the opening / closing mechanism.
  • the main pipe is connected to an evaporator and a throttle device to constitute a refrigeration cycle circuit.
  • the refrigerant it is possible to use at least R404A or a mixed refrigerant containing HFC-32, HFC-125, HFC-134a, and HFO-1234yf.
  • the control unit has a measurement result of the temperature measurement unit as a first temperature.
  • the opening / closing mechanism is opened, and the opening / closing mechanism is closed when the measurement result is a second temperature lower than the first temperature.
  • the schematic block diagram which shows the freezing apparatus of embodiment. Sectional drawing of the principal part of the compressor of the freezing apparatus of embodiment. The figure showing the change at the time of operating the refrigerating device of embodiment using R448A, and the opening degree of an electronic expansion valve. The figure showing the change at the time of operating the freezing apparatus of embodiment using R404A and the opening degree of an electronic expansion valve.
  • the refrigeration apparatus 1 includes a refrigeration machine 2 according to the present embodiment, an evaporator 11 and an expansion valve (throttle device) 12 connected to a later-described main pipe 22 of the refrigeration machine 2, a refrigeration machine. 2, the evaporator 11 and the refrigerant R filled in the expansion valve 12 and the like.
  • the refrigerator 2 is connected to the showcase 10 in a store (not shown).
  • the showcase 10 includes the evaporator 11 and the expansion valve 12 described above, and a connection pipe 13 that sequentially connects the evaporator 11 and the expansion valve 12.
  • the expansion valve 12 is an electronic expansion valve (PMV: Pulse Motor Valve) or an automatic expansion valve. In the present embodiment, a case where an automatic expansion valve is used as a throttle device will be described.
  • PMV Pulse Motor Valve
  • the expansion valve 12 can be switched between an open state in which the refrigerant R flows in the connection pipe 13 and a closed state in which the refrigerant does not flow in the connection pipe 13.
  • the expansion valve 12 can adjust the flow rate of the refrigerant R flowing through the connection pipe 13 by adjusting the opening degree between the open state and the closed state.
  • the evaporator 11 is provided at a position closer to the first end 22a of the main pipe 22 to be described later than the expansion valve 12 in the connection pipe 13.
  • a blower for sending air to the evaporator 11 may be disposed at a position facing the evaporator 11.
  • the refrigerator 2 includes a compressor 20, a condenser 21, a main pipe 22 that sequentially connects the compressor 20 and the condenser 21, a bypass pipe 23 that is connected to the main pipe 22, and a bypass pipe 23.
  • An electronic expansion valve (opening / closing mechanism) 24 provided, a temperature sensor (temperature measuring unit) 25 for measuring the temperature of the refrigerant R discharged from the compressor 20, a control unit 26 for controlling the compressor 20, the electronic expansion valve 24, and the like.
  • the main pipe 22 has a first end 22a and a second end 22b. The main pipe 22 sequentially connects the first end 22a, the compressor 20, the condenser 21, and the second end 22b.
  • the compressor 20 has a rotary compression mechanism 20a as shown in FIG. That is, by driving the motor 20c (see FIG. 1), the cylindrical rollers 31 rotate in a pair of cylinders 30 provided in the case 29, respectively.
  • the roller 31 is disposed so as to be able to slide and rotate following the eccentric rotation of the crank portion of the rotating shaft 31a.
  • the roller 31 rotates and moves from the position shown in the figure to, for example, the position P1.
  • a pair of cylinders 30 is partitioned by a partition plate 32.
  • the bypass pipe 23 is connected to the cylinder 30 through the partition plate 32.
  • the refrigerant R supplied into the bypass pipe 23 is supplied into each cylinder 30 through the through hole 23a.
  • the compressor 20 is a so-called twin rotary compressor, but the type of the compressor is not limited to this.
  • the compressor may be a rotary compressor having one roller, a reciprocating type, a scroll type, or the like.
  • the temperature sensor 25 for example, a contact type or non-contact type sensor is used.
  • the temperature sensor 25 is attached to a discharge port 20b through which the refrigerant R is discharged from the compressor 20, as shown in FIG.
  • the temperature sensor 25 measures the temperature of the refrigerant R discharged from the compressor 20, more specifically, the temperature of the discharge port 20b through which the discharged refrigerant R passes.
  • a suction cup 35 which is a relatively small gas-liquid separator, is provided at a position near the first end 22 a of the main pipe 22 in the compressor 20.
  • a condenser configured similarly to the evaporator 11 can be used.
  • a blower 34 for sending air to the condenser 21 is disposed at a position facing the condenser 21.
  • the first end 22a and the second end 22b of the main pipe 22 are provided with connection parts 22c and 22d which are packed valves or the like for connecting to or disconnecting from the connection pipe 13 of the showcase 10. ing.
  • a receiver tank 36 for temporarily storing the refrigerant R is provided in a portion of the main pipe 22 that is closer to the second end 22 b than the condenser 21.
  • the bypass pipe 23 connects a portion of the main pipe 22 between the receiver tank 36 (condenser 21) and the second end 22b and the inside of the cylinder 30 of the compressor 20.
  • the electronic expansion valve 24 switches between an open state in which the refrigerant R flows in the bypass pipe 23 and a closed state in which the refrigerant R does not flow in the bypass pipe 23.
  • the electronic expansion valve 24 restricts the flow of the refrigerant R in the open state.
  • the electronic expansion valve 24 is opened, the refrigerant R flows into the cylinder 30 through the bypass pipe 23.
  • An injection operation in which the compressor 20 is cooled by the refrigerant R is performed.
  • the electronic expansion valve 24 is a bypass valve that switches the bypass pipe 23 between an open state and a closed state.
  • a switch 39 is provided. When the pressure of the refrigerant R in the bypass pipe 23 becomes larger than a predetermined threshold value, the high pressure switch 39 transmits a signal to the control unit 26. The control unit 26 stops the operation of the compressor 20 based on this signal.
  • a strainer 41, a pressure sensor 42, and a check valve 43 are provided at a portion between the first end 22 a and the compressor 20 in the main pipe 22 in the order closer to the first end 22 a.
  • the pressure sensor 42 transmits the measurement result of the pressure of the refrigerant R in the main pipe 22 to the control unit 26. Note that the control unit 26 may stop the operation of the compressor 20 based on the signal transmitted from the pressure sensor 42.
  • the check valve 43 allows the refrigerant R to flow from the first end 22a to the second end 22b in the main pipe 22, but from the second end 22b to the first end 22a. Regulate the flow of R.
  • a second bypass pipe 45 is provided so as to connect a portion between the check valve 43 and the suction cup 35 and a portion between the compressor 20 and the condenser 21 in the main pipe 22.
  • An electromagnetic valve 46 is attached to the second bypass pipe 45.
  • the solenoid valve 46 switches between an open state in which the refrigerant R flows through the second bypass pipe 45 and a closed state in which the refrigerant R does not flow through the second bypass pipe 45.
  • the electronic expansion valve 24, the motor 20c, the temperature sensor 25, the blower 34, the high pressure switch 39, the pressure sensor 42, and the electromagnetic valve 46 are connected to the control unit 26, respectively.
  • the temperature of the refrigerant R discharged from the compressor 20 measured by the temperature sensor 25 and the pressure of the refrigerant R in the main pipe 22 measured by the pressure sensor 42 are transmitted to the control unit 26 at predetermined intervals.
  • control unit 26 includes an arithmetic circuit, a memory, and the like, and performs control based on a control program, for example.
  • the memory of the control unit 26 stores, for example, a first temperature that is about 80 ° C. and a second temperature that is about 70 ° C., which are used for controlling the electronic expansion valve 24.
  • the arithmetic circuit of the control unit 26 expands the expansion valve 12, the electronic expansion valve 24, the motor 20c of the compressor 20, the temperature sensor 25, the blower 34, the high pressure switch 39, and the pressure sensor 42.
  • the electromagnetic valve 46 is controlled.
  • the electronic expansion valve 24 is switched between an open state and a closed state.
  • the main piping 22 is connected to the evaporator 11 and the expansion valve 12 via the connecting piping 13 by the connecting portions 22c and 22d, thereby constituting the refrigeration cycle circuit 3.
  • a mixed refrigerant containing HFC-32, HFC-125, HFC-134a, and HFO-1234yf (a mixed refrigerant containing HFC-32 and the like) is used.
  • the mixed refrigerants 26 wt% HFC-32, 26 wt% HFC-125, 21 wt% HFC-134a, 20 wt% HFO-1234yf, and 7 wt% HFO-1234ze.
  • R448A including these is used.
  • HFC-32 has a chemical name of difluoromethane and a chemical formula of CH 2 F 2 .
  • HFC-125 has a chemical name of pentafluoroethane and a chemical formula of CHF 2 CF 3 .
  • HFC-134a has a chemical name of 1,1,1,2-tetrafluoroethane and a chemical formula of C 2 H 2 F 4 .
  • HFO-1234yf has a chemical name of 2,3,3,3-tetrafluoro-1-propene and a chemical formula of CF 3 CF ⁇ CH 2 .
  • HFO-1234ze has the chemical name (E) -1,3,3,3-tetrafluoroprop-1-ene (trans-1,3,3,3-tetrafluoropropene). The chemical formula of HFO-1234ze is trans-CF 3 CH ⁇ CHF, C 3 H 2 F 4 , and GWP is 7.
  • R449A containing 24% by weight of HFC-32, 25% by weight of HFC-125, 26% by weight of HFC-134a, and 25% by weight of HFO-1234yf is used. It is done.
  • the R404A filled in the refrigeration apparatus 1 includes 44 wt% HFC-125, 4 wt% HFC-134a, and 52 wt% HFC-143a.
  • the refrigerant R is filled into the compressor 20, the condenser 21, the main pipe 22, the evaporator 11, the expansion valve 12, the connection pipe 13, and the like.
  • the operation of the refrigerator 2 and the refrigeration apparatus 1 of the present embodiment configured as described above will be described.
  • An operator connects the connection parts 22c and 22d of the main pipe 22 of the refrigerator 2 that is not filled with the refrigerant R to the connection pipe 13 of the showcase 10 in the store.
  • the electronic expansion valve 24 and the electromagnetic valve 46 are closed.
  • the expansion valve 12 is also closed.
  • a vacuum pump (not shown) is connected to the main pipe 22 of the refrigeration apparatus 1, and the main pipe 22 and the connection pipe 13 are evacuated. After the evacuation is completed, the connection of the vacuum pump is released, and the main pipe 22 and the connection pipe 13 are filled with the refrigerant R, for example, R448A.
  • the electromagnetic valve 46 is opened, and the pressures of the condenser 21 and the evaporator 11 of the refrigeration cycle circuit 3 are made equal.
  • the refrigeration apparatus 1 is configured by the evaporator 11, the expansion valve 12, the connection pipe 13, and the refrigerator 2 of the showcase 10 through the above steps.
  • the control unit 26 drives the compressor 20.
  • the refrigerant R that has passed through the suction cup 35 is sucked into the cylinder 30 of the compressor 20.
  • the blower 34 is driven to send air to the condenser 21.
  • the temperature of the refrigerant R discharged from the compressor 20 measured by the temperature sensor 25 and the pressure of the refrigerant R in the main pipe 22 measured by the pressure sensor 42 are transmitted to the control unit 26 at predetermined intervals. Since the pressures of the condenser 21 and the evaporator 11 in the refrigeration cycle circuit 3 are equal, the driving of the compressor 20 can be easily started.
  • the control unit 26 closes the electromagnetic valve 46 when a certain time has elapsed from the start of driving of the compressor 20.
  • the refrigerant R compressed by the rotation of the roller 31 in the cylinder 30 and becoming high temperature and high pressure is discharged from the discharge port 20 b of the compressor 20.
  • the change with respect to time of the temperature of the discharge port 20b at this time is indicated by a line L1 in FIG.
  • the change with respect to time of the temperature of the refrigerant R at the intermediate position between the inlet and the outlet of the refrigerant R in the condenser 21 is indicated by a line L2.
  • a change with respect to time of the temperature of the refrigerant R at the intermediate position between the inlet and the outlet of the refrigerant R in the evaporator 11 is indicated by a line L3.
  • the open / closed state of the electronic expansion valve 24 is indicated by a line L4.
  • the lines L1, L2, and L3 representing temperature use the left vertical axis.
  • the line L4 representing the opening of the electronic expansion valve 24 uses the right vertical axis.
  • the electronic expansion valve 24 was controlled by switching to either a closed state or an open state with a constant opening.
  • the electronic expansion valve 24 may be controlled such that the opening degree changes gradually or the opening degree changes stepwise.
  • FIG. 3 shows a change in temperature for 30 minutes and a change in the opening of the electronic expansion valve 24 when the operation of the refrigeration apparatus 1 is stabilized.
  • a certain amount of oil is supplied into the cylinder 30 from a lubricating oil path provided on the rotary shaft 31a.
  • the refrigerant R discharged from the compressor 20 flows in the condenser 21 through the main pipe 22. At this time, the refrigerant R is cooled by the blower 34.
  • the refrigerant R flowing out from the condenser 21 rapidly expands through the expansion valve 12 after passing through the receiver tank 36.
  • the refrigerant R that has passed through the expansion valve 12 is reduced in pressure, and at the same time, the temperature is reduced due to an isoenthalpy change while taking heat of vaporization.
  • the refrigerant R that has passed through the expansion valve 12 flows in the evaporator 11 and is heated and evaporated by the air sent from the blower.
  • the showcase 10 is cooled because the air sent from the blower is deprived of heat.
  • the refrigerant R that has come out of the evaporator 11 sequentially flows through the connection pipe 13 and the main pipe 22.
  • the refrigerant R passes through the suction cup 35 and is sucked into the cylinder 30 of the compressor 20.
  • the opening degree of the expansion valve 12 By adjusting the opening degree of the expansion valve 12, the flow rate of the refrigerant R flowing through the refrigeration apparatus 1 is adjusted.
  • the electronic expansion valve 24 is closed and the injection operation is not performed, the oil in the cylinder 30 is not easily washed out from the cylinder 30 to the outside.
  • the temperature of the refrigerant R discharged from the compressor 20 increases.
  • the control unit 26 opens the electronic expansion valve 24. Specifically, as shown in FIG. 3, the temperature of the refrigerant R at the discharge port 20b indicated by the line L1 increases with time. The controller 26 changes the electronic expansion valve 24 from the closed state to the open state at time T1 when the temperature of the discharged refrigerant R reaches the first temperature t1.
  • the refrigerant R flows into the cylinder 30 of the compressor 20 through the bypass pipe 23, and the compressor 20 is cooled by the heat of vaporization of the refrigerant R. A part of the oil in the cylinder 30 is washed away by the refrigerant R flowing in by the injection operation. As time elapses, the temperature of the refrigerant R at the discharge port 20b decreases. When the measurement result of the temperature sensor 25 reaches the second temperature t2, which is 70 ° C., for example, the control unit 26 closes the electronic expansion valve 24. The second temperature t2 is lower than the first temperature t1. Since the injection operation is not performed, the oil in the cylinder 30 is not easily washed away.
  • the temperature of the refrigerant R discharged from the compressor 20 increases with time.
  • the cycle ⁇ T ⁇ b> 1 composed of the period when the electronic expansion valve 24 is closed and the period when the electronic expansion valve 24 is open is repeated.
  • the refrigerant R continues to flow intermittently.
  • FIG. 1 the result of operating a refrigeration apparatus using R404A instead of R448A as the refrigerant R of the refrigeration apparatus 1 is shown in FIG.
  • the change of the temperature of the discharge outlet 20b at this time is shown by the line L11 in FIG.
  • a change in the temperature of the refrigerant R in the condenser 21 is indicated by a line L12.
  • the time of the temperature of the refrigerant R in the evaporator 11 is indicated by a line L13.
  • the open / closed state of the electronic expansion valve 24 is indicated by a line L14. 4 also shows a change in temperature for 30 minutes and a change in the opening of the electronic expansion valve 24 as in FIG.
  • the first temperature t1 and the second temperature t2 are the same when R448A is used as the refrigerant R and when R404A is used as the refrigerant R. That is, the first temperature t1 when R448A is used as the refrigerant R and the first temperature t1 when R404A is used as the refrigerant R are equal. Similarly, the second temperature t2 when R448A is used as the refrigerant R and the second temperature t2 when R404A is used as the refrigerant R are equal.
  • a cycle ⁇ T2 composed of one period in which the electronic expansion valve 24 is closed and one period in the open state is repeated.
  • the electronic expansion valve 24 is intermittently opened and closed, and the refrigerant R continues to flow intermittently. Since the temperature of the refrigerant discharged from the compressor 20 tends to be lower in R404A than in R448A, the period ⁇ T2 is longer than the period ⁇ T1. In other words, the frequency when the electronic expansion valve 24 is opened and closed is higher when R448A is used as the refrigerant R than when R448A is used.
  • the R448A is used as the refrigerant R and the open / closed state of the electronic expansion valve 24 is switched.
  • the electronic expansion valve 24 is open, the compressor 20 is cooled by the injection operation, and when the electronic expansion valve 24 is closed, the oil in the cylinder 30 is not easily washed away. Therefore, it is possible to prevent the oil from being washed away from the compressor 20 while lowering the temperature of the refrigerant R discharged from the compressor 20.
  • R448A tends to have a higher temperature of the refrigerant R discharged from the compressor 20 than R404A (the amount of heat transported by the refrigerant R increases). Therefore, when R448A is used, the amount of the refrigerant R used for the injection operation is reduced. Need to increase. For this reason, when R448A is used as the refrigerant R compared to when R404A is used as the refrigerant R, the first temperature t1 and the second temperature t2 for switching the open / closed state of the electronic expansion valve 24 are lowered. It also seems preferable.
  • the first temperature t1 and the second temperature t2 are constant when the R448A is used as the refrigerant R and when the R404A is used as the refrigerant R.
  • the cycle for opening and closing the electronic expansion valve 24 in the case where R448A is used as the refrigerant R of the present embodiment is shorter. That is, the electronic expansion valve 24 is frequently opened and closed.
  • the period in which the oil in the cylinder 30 is washed away by the injection operation with the electronic expansion valve 24 open is shorter in one cycle ⁇ T1 than when R404A is used as the refrigerant R.
  • the amount of the refrigerant R used for the injection operation in one cycle ⁇ T1 is reduced, making it difficult for the oil to be washed away, and the wear between the cylinder 30 and the roller 31 can be reduced. Therefore, the reliability of the refrigeration apparatus 1 can be improved even when R448A, which is likely to increase the refrigerant temperature, is used.
  • coolant R used for the freezing apparatus 1 is not restricted to R448A.
  • the refrigerant R used in the refrigeration apparatus 1 may be R449A or a mixed refrigerant containing HFC-32 or the like.
  • the opening / closing mechanism is the electronic expansion valve 24.
  • the open / close mechanism includes a two-way valve that switches between an open state in which the refrigerant R flows in the bypass pipe 23 and a closed state in which the refrigerant R does not flow in the bypass pipe 23, and a capillary tube connected in series to the two-way valve. And may be configured.
  • the temperature of the refrigerant R discharged from the compressor 20 is lowered, and the washing of oil from the compressor 20 is suppressed. be able to.
  • the case where the automatic expansion electricity is used as the expansion valve 12 is described.
  • an electronic expansion valve may be used, and in this case, the control unit 26 provided in the refrigerator 2 may Operation control may be performed.
  • a central controller that collectively controls the entire refrigeration apparatus 1 including the refrigerator 2 and the showcase 10 in the store may be separately provided to control the entire system.

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Abstract

L'invention concerne un réfrigérateur qui, selon un mode de réalisation, comprend un compresseur, un condenseur, un conduit principal, un tuyau de dérivation, un mécanisme d'ouverture et de fermeture, une unité de mesure de la température, et une unité de commande. Le conduit principal possède une première extrémité et une seconde extrémité. Le conduit principal relie de manière séquentielle la première extrémité, le compresseur, le condenseur, et la seconde extrémité. Le tuyau de dérivation relie une partie du conduit principal entre le condenseur et la seconde extrémité, et le compresseur. Le mécanisme d'ouverture et de fermeture est prévu au niveau du tuyau de dérivation. Le mécanisme d'ouverture et de fermeture fait alterner le tuyau de dérivation entre une position ouverte et une position fermée. L'unité de mesure de la température mesure la température du réfrigérant évacué par le compresseur. L'unité de commande permet de commander le mécanisme d'ouverture et de fermeture. Le réfrigérant comprend du HFC-32, du HFC-125, du HFC-134a et du HFO-1234yf. L'unité de commande place le mécanisme d'ouverture et de fermeture en position ouverte si le résultat de mesure de l'unité de mesure de la température est une première température, et l'unité de commande place le mécanisme d'ouverture et de fermeture en position fermée si le résultat de mesure est une seconde température inférieure à la première température.
PCT/JP2016/061695 2015-06-16 2016-04-11 Réfrigérateur et système de réfrigération WO2016203827A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2017524692A JP6500104B2 (ja) 2015-06-16 2016-04-11 冷凍機及び冷凍装置
SG11201710231YA SG11201710231YA (en) 2015-06-16 2016-04-11 Refrigerator and refrigeration system
PH12017502278A PH12017502278A1 (en) 2015-06-16 2017-12-12 Refrigerator and refrigeration system

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JP2015121472 2015-06-16
JP2015-121472 2015-06-16

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PH (1) PH12017502278A1 (fr)
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110343509A (zh) * 2018-04-02 2019-10-18 江西天宇化工有限公司 一种不可燃且能降低温室效应的混合制冷剂及其应用
WO2020031319A1 (fr) * 2018-08-09 2020-02-13 三菱電機株式会社 Dispositif à cycle frigorifique

Citations (3)

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