EP4286774A1 - Dispositif à cycle de réfrigération - Google Patents

Dispositif à cycle de réfrigération Download PDF

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Publication number
EP4286774A1
EP4286774A1 EP21922799.8A EP21922799A EP4286774A1 EP 4286774 A1 EP4286774 A1 EP 4286774A1 EP 21922799 A EP21922799 A EP 21922799A EP 4286774 A1 EP4286774 A1 EP 4286774A1
Authority
EP
European Patent Office
Prior art keywords
refrigerant
path
heat exchanger
receiver
valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP21922799.8A
Other languages
German (de)
English (en)
Other versions
EP4286774A4 (fr
Inventor
Tomotaka Ishikawa
So Nomoto
Kosuke Tanaka
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of EP4286774A1 publication Critical patent/EP4286774A1/fr
Publication of EP4286774A4 publication Critical patent/EP4286774A4/fr
Pending legal-status Critical Current

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Classifications

    • 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
    • F25B45/00—Arrangements for charging or discharging refrigerant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2309/00—Gas cycle refrigeration machines
    • F25B2309/06—Compression machines, plants or systems characterised by the refrigerant being carbon dioxide
    • 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
    • F25B2400/13—Economisers
    • 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
    • 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
    • F25B2400/23—Separators
    • 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
    • F25B2600/2523—Receiver 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves

Definitions

  • the present disclosure relates to a refrigeration cycle apparatus.
  • PTL 1 International Publication No. 2020/208752 discloses a refrigeration cycle apparatus in which gas-liquid two-phase refrigerant is separated into gas refrigerant and liquid refrigerant, and excess refrigerant is stored as liquid refrigerant in a receiver.
  • the receiver has an upper end provided with a refrigerant inlet and a gas outlet.
  • the receiver also has a lower end provided with a refrigerant outlet.
  • the liquid refrigerant stored in the receiver increases, the liquid level of the liquid refrigerant rises and the liquid refrigerant flows out through the gas outlet provided at the upper end of the receiver.
  • the gas-liquid separation efficiency decreases.
  • the receiver needs to be increased in size such that the liquid refrigerant does not flow out through the gas outlet even when the liquid refrigerant stored in the receiver increases.
  • the present disclosure has been made in view of the above-described problems, and an object of the present disclosure is to provide a refrigeration cycle apparatus in which a receiver can be reduced in size while allowing reliable gas-liquid separation of refrigerant.
  • a refrigeration cycle apparatus of the present disclosure includes a refrigerant circuit and a gas-liquid separation circuit.
  • the refrigerant circuit includes: a compressor configured to compress refrigerant; a condenser configured to condense the refrigerant discharged from the compressor; a decompression device configured to decompress the refrigerant flowing out of the condenser; and an evaporator configured to evaporate the refrigerant flowing out of the decompression device.
  • the gas-liquid separation circuit is connected to the refrigerant circuit between the condenser and the decompression device, and to the compressor, or the refrigerant circuit between the compressor and the evaporator.
  • the gas-liquid separation circuit includes: an internal heat exchanger; a receiver configured to store the refrigerant flowing out of the internal heat exchanger; a first valve configured to adjust a flow rate of the refrigerant flowing out of the receiver; and a second valve connected to the internal heat exchanger and the receiver.
  • the internal heat exchanger has: a first path through which the refrigerant flowing out of the condenser flows; and a second path through which the refrigerant flowing out of the first path flows.
  • the internal heat exchanger is configured to exchange heat between the refrigerant flowing through the first path and the refrigerant flowing through the second path.
  • the gas-liquid separation circuit has: a first flow path having the first path of the internal heat exchanger, the receiver, and the first valve; and a second flow path having the second path of the internal heat exchanger and the second valve.
  • the second flow path is configured to branch from the first flow path between the internal heat exchanger and the receiver, and merge into the first flow path between the first valve and the refrigerant circuit.
  • the receiver can be reduced in size while allowing reliable gas-liquid separation of the refrigerant by the gas-liquid separation circuit.
  • FIG. 1 is a refrigerant circuit diagram of refrigeration cycle apparatus 100 according to an embodiment.
  • Refrigeration cycle apparatus 100 according to the embodiment is a refrigerator, for example.
  • refrigeration cycle apparatus 100 includes a refrigerant circuit 101, a gas-liquid separation circuit 102, and a controller 103.
  • the refrigerant circulating through refrigeration cycle apparatus 100 is carbon dioxide (CO 2 ), for example.
  • Refrigerant circuit 101 includes a compressor 1, a condenser 2, a decompression device 3, and an evaporator 4. Compressor 1, condenser 2, decompression device 3, and evaporator 4 are connected through pipes to constitute refrigerant circuit 101. Refrigerant circuit 101 is configured such that refrigerant flows through compressor 1, condenser 2, decompression device 3, and evaporator 4 in this order.
  • Compressor 1 is configured to compress refrigerant.
  • Compressor 1 is configured to suction refrigerant, compress the suctioned refrigerant, and discharge the compressed refrigerant.
  • Compressor 1 is configured to compress the refrigerant to be brought into a high-temperature and high-pressure state.
  • compressor 1 includes an injection port provided in an intermediate pressure portion.
  • Compressor 1 may be configured such that its displacement is variable. Compressor 1 may be configured such that its displacement is varied in accordance with the rotation speed adjusted by changing the frequency based on an instruction from controller 103.
  • Condenser 2 is configured to condense the refrigerant discharged from compressor 1. Condenser 2 is configured to cool the refrigerant discharged from compressor 1 so as to condense the refrigerant. Condenser 2 is, for example, a fin-and-tube type heat exchanger including a plurality of fins and a heat transfer tube penetrating the plurality of fins.
  • Decompression device 3 is configured to decompress the refrigerant having flowed out of condenser 2.
  • Decompression device 3 is an expansion valve.
  • Decompression device 3 is an electromagnetic valve, for example.
  • Decompression device 3 is configured to adjust the flow rate of the refrigerant based on an instruction from controller 103.
  • Evaporator 4 is configured to evaporate the refrigerant having flowed out of decompression device 3.
  • Evaporator 4 is configured to heat and evaporate the refrigerant having flowed out of decompression device 3.
  • Evaporator 4 is, for example, a fin-and-tube type heat exchanger including a plurality of fins and a heat transfer tube penetrating the plurality of fins.
  • Gas-liquid separation circuit 102 is connected to refrigerant circuit 101 between condenser 2 and decompression device 3, and to compressor 1 or refrigerant circuit 101 between compressor 1 and evaporator 4.
  • gas-liquid separation circuit 102 is connected to refrigerant circuit 101 between condenser 2 and decompression device 3, and to compressor 1.
  • gas-liquid separation circuit 102 is connected to a pipe of refrigerant circuit 101 between condenser 2 and decompression device 3, and to the intermediate pressure side of compressor 1.
  • Gas-liquid separation circuit 102 includes an internal heat exchanger 5, a receiver 6, a first valve 7, and a second valve 8. Internal heat exchanger 5, receiver 6, first valve 7, second valve 8, and the pipes constitute a gas-liquid separation mechanism 10. Gas-liquid separation mechanism 10 has an inlet 11 connected to refrigerant circuit 101 between condenser 2 and decompression device 3. Gas-liquid separation mechanism 10 has a branch portion 12 disposed among internal heat exchanger 5, receiver 6, and second valve 8. Gas-liquid separation mechanism 10 has a merging portion 13 disposed among internal heat exchanger 5, first valve 7, and an outlet 14 of gas-liquid separation mechanism 10. Outlet 14 of gas-liquid separation mechanism 10 is connected to compressor 1 or to refrigerant circuit 101 between compressor 1 and evaporator 4.
  • Internal heat exchanger 5 is connected through a pipe to refrigerant circuit 101 between condenser 2 and decompression device 3.
  • Internal heat exchanger 5 includes a first path 51 and a second path 52.
  • First path 51 is configured such that the refrigerant having flowed out of condenser 2 flows therethrough.
  • Second path 52 is configured such that the refrigerant having flowed out of first path 51 flows therethrough.
  • Internal heat exchanger 5 is configured to exchange heat between the refrigerant flowing through first path 51 and the refrigerant flowing through second path 52. In the present embodiment, internal heat exchanger 5 is configured such that the flow of the refrigerant flowing through first path 51 is counter to the flow of the refrigerant flowing through second path 52.
  • internal heat exchanger 5 is configured such that the refrigerant flowing through first path 51 and the refrigerant flowing through second path 52 flow as counterflows to each other. Internal heat exchanger 5 is disposed upstream of receiver 6 in the flow of refrigerant.
  • Receiver 6 is connected to internal heat exchanger 5, first valve 7, and second valve 8 through pipes.
  • Receiver 6 has an upper end provided with a refrigerant inlet 6a.
  • Receiver 6 has a lower end provided with a refrigerant outlet 6b.
  • Receiver 6 is configured to store the refrigerant having flowed out of internal heat exchanger 5.
  • Receiver 6 is configured to store liquefied liquid refrigerant.
  • Receiver 6 is configured to store excess refrigerant.
  • First valve 7 is connected to refrigerant outlet 6b of receiver 6 through a pipe.
  • First valve 7 is configured to adjust the flow rate of the refrigerant having flowed out of receiver 6.
  • First valve 7 is a flow control valve, for example.
  • First valve 7 is an electromagnetic valve, for example.
  • Second valve 8 is connected to internal heat exchanger 5 and receiver 6. Second valve 8 is connected through pipes to first path 51 of internal heat exchanger 5, refrigerant inlet 6a of receiver 6, and second path 52 of internal heat exchanger 5. Second valve 8 is an on-off valve, for example. Second valve 8 may be a flow control valve, for example. Second valve 8 is an electromagnetic valve, for example.
  • Gas-liquid separation circuit 102 includes a first flow path P1 and a second flow path P2.
  • First flow path P1 includes first path 51 of internal heat exchanger 5, receiver 6, and first valve 7.
  • First flow path P1 is configured such that the refrigerant flows through first path 51 of internal heat exchanger 5, receiver 6, and first valve 7 in this order.
  • Second flow path P2 includes second path 52 of internal heat exchanger 5 and second valve 8. Second flow path P2 is configured such that the refrigerant flows through second valve 8 and second path 52 of internal heat exchanger 5 in this order.
  • First flow path P1 is connected to refrigerant circuit 101 between condenser 2 and decompression device 3, and to compressor 1 or refrigerant circuit 101 between compressor 1 and evaporator 4.
  • Second flow path P2 is configured to branch from first flow path P1 between internal heat exchanger 5 and receiver 6 and then merge into first flow path P1 between first valve 7 and refrigerant circuit 101.
  • Second flow path P2 is configured to branch from first flow path P1 at branch portion 12 and then merge into first flow path P1 at merging portion 13.
  • Controller 103 is configured to control the entire refrigeration cycle apparatus 100. Controller 103 is configured to control refrigerant circuit 101 and gas-liquid separation circuit 102. Controller 103 is configured to control compressor 1 and decompression device 3 in refrigerant circuit 101. Controller 103 is configured to control the opening degrees of first valve 7 and second valve 8 in gas-liquid separation circuit 102. Controller 103 is constituted of a microcomputer, for example. Controller 103 includes a central processing unit (CPU), a random access memory (RAM), a read only memory (ROM), and the like. The ROM stores a control program.
  • CPU central processing unit
  • RAM random access memory
  • ROM read only memory
  • FIG. 2 is a refrigerant circuit diagram showing the operation of refrigeration cycle apparatus 100 according to the embodiment while it operates.
  • each of arrows indicated in refrigerant circuit 101 and gas-liquid separation circuit 102 shows the flow of refrigerant.
  • the following first describes the flow of the refrigerant flowing through refrigerant circuit 101.
  • the refrigerant having flowed into compressor 1 is compressed by compressor 1 to become high-temperature and high-pressure gas refrigerant, which is then discharged from compressor 1.
  • the high-temperature and high-pressure gas refrigerant flows into condenser 2 and is condensed by condenser 2 to becomes liquid refrigerant, which then flows out of condenser 2.
  • Part of the liquid refrigerant flows into decompression device 3 and is decompressed by decompression device 3 to become low-pressure gas-liquid two-phase refrigerant, which then flows out of decompression device 3.
  • the low-pressure gas-liquid two-phase refrigerant flows into evaporator 4 and is evaporated by evaporator 4 to become gas refrigerant.
  • the gas refrigerant flows into compressor 1. In this way, the refrigerant circulates through refrigerant circuit 101.
  • Part of the refrigerant having flowed out of condenser 2 flows from refrigerant circuit 101 into gas-liquid separation circuit 102.
  • the refrigerant having flowed into gas-liquid separation circuit 102 flows into first path 51 of internal heat exchanger 5, exchanges heat with the refrigerant flowing through second path 52, and then flows out of internal heat exchanger 5.
  • Part of the refrigerant having flowed out of first path 51 of internal heat exchanger 5 flows into receiver 6 through first path P1.
  • refrigerant circuit 101 excess refrigerant occurs due to the operating state of refrigeration cycle apparatus 100, the outdoor air temperature, and the like. This excess refrigerant that is liquid refrigerant is stored in receiver 6.
  • the liquid refrigerant stored in receiver 6 due to the operating state of refrigeration cycle apparatus 100, the outdoor air temperature and the like is required, the liquid refrigerant flows out of receiver 6 and then flows through first valve 7 into the intermediate pressure side of
  • Part of the refrigerant having flowed out of first path 51 of internal heat exchanger 5 flows out from branch portion 12 of gas-liquid separation mechanism 10 through second valve 8 into second path 52 of internal heat exchanger 5, exchanges heat with the refrigerant flowing through first path 51, and then flows out of internal heat exchanger 5.
  • the refrigerant having flowed through second path 52 of internal heat exchanger 5 is decompressed to become superheated gas refrigerant.
  • the superheated gas refrigerant having flowed out of second path 52 of internal heat exchanger 5 merges into the liquid refrigerant having flowed out of receiver 6 at merging portion 13 of gas-liquid separation mechanism 10, and then flows into the intermediate pressure side of compressor 1. In this way, the refrigerant flows through gas-liquid separation circuit 102.
  • first valve 7 When the opening degree of first valve 7 increases, the liquid refrigerant flows out of receiver 6, and thereby, the amount of the liquid refrigerant stored in receiver 6 decreases.
  • second valve 8 increases, the gas refrigerant leaks from receiver 6, and thereby, the amount of the liquid refrigerant stored in receiver 6 increases. In this way, the opening degrees of first valve 7 and second valve 8 are controlled to thereby control the amount of liquid refrigerant stored in receiver 6.
  • the following describes a modification of refrigeration cycle apparatus 100 according to the embodiment.
  • the modification of refrigeration cycle apparatus 100 according to the embodiment has the same configuration and the same operation as those of refrigeration cycle apparatus 100 according to the embodiment unless otherwise specified.
  • Fig. 3 is a refrigerant circuit diagram of the first modification of refrigeration cycle apparatus 100 according to the embodiment.
  • gas-liquid separation circuit 102 further includes a third valve 9.
  • Third valve 9 is a flow control valve, for example.
  • Third valve 9 is an electromagnetic valve, for example.
  • Third valve 9 is disposed between refrigerant circuit 101 and internal heat exchanger 5.
  • part of the refrigerant having flowed out of condenser 2 flows into first path 51 of internal heat exchanger 5 through third valve 9.
  • FIG. 4 is a refrigerant circuit diagram of the second modification of refrigeration cycle apparatus 100 according to the embodiment.
  • gas-liquid separation circuit 102 is connected to refrigerant circuit 101 between condenser 2 and decompression device 3, and to refrigerant circuit 101 between compressor 1 and evaporator 4.
  • refrigerant circuit 101 further includes an accumulator 20.
  • Accumulator 20 is disposed between compressor 1 and evaporator 4 in refrigerant circuit 101.
  • Gas-liquid separation circuit 102 is connected to refrigerant circuit 101 between evaporator 4 and accumulator 20.
  • Accumulator 20 is configured to receive the refrigerant having flowed out of evaporator 4 and gas-liquid separation circuit 102. Accumulator 20 is configured to store the refrigerant having flowed out of evaporator 4 and gas-liquid separation circuit 102.
  • the refrigerant having flowed out of evaporator 4 and gas-liquid separation circuit 102 flows into compressor 1 through accumulator 20.
  • FIG. 5 is a refrigerant circuit diagram of refrigeration cycle apparatus 100 of the comparative example.
  • gas-liquid separation circuit 102 does not include internal heat exchanger 5.
  • Receiver 6 has an upper end provided with a refrigerant inlet 6a and a gas outlet 6c.
  • Receiver 6 has a lower end provided with a refrigerant outlet 6b.
  • the liquid refrigerant stored in receiver 6 increases, the liquid level of the liquid refrigerant rises, and then, the liquid refrigerant flows out through gas outlet 6c provided at the upper end of receiver 6.
  • the gas-liquid separation efficiency decreases.
  • receiver 6 needs to be increased in size such that the liquid refrigerant does not flow out through the gas outlet even when the liquid refrigerant stored in receiver 6 increases.
  • receiver 6 not having gas outlet 6c can prevent the liquid refrigerant from flowing out through gas outlet 6c of receiver 6 even when the liquid refrigerant stored in receiver 6 increases to thereby raise the liquid level of the liquid refrigerant.
  • internal heat exchanger 5 decompresses the refrigerant, and thereby, gas refrigerant can be separated. Therefore, gas-liquid separation of the refrigerant can be reliably done. Further, even when the liquid refrigerant stored in receiver 6 increases and the liquid level of the liquid refrigerant rises, the liquid refrigerant can be prevented from flowing out through gas outlet 6c of receiver 6, so that the liquid refrigerant can be stored up to the upper end of receiver 6.
  • receiver 6 can be reduced in size while being capable of storing the same amount of liquid refrigerant. Accordingly, receiver 6 can be reduced in size. Therefore, according to refrigeration cycle apparatus 100 of the embodiment, receiver 6 can be reduced in size while allowing reliable gas-liquid separation of the refrigerant by gas-liquid separation circuit 102.
  • refrigeration cycle apparatus 100 since the amount of refrigerant in receiver 6 can be controlled, the performance can be improved. Further, since the amount of refrigerant in receiver 6 can be controlled, the operating range of refrigeration cycle apparatus 100 can be enlarged.
  • second valve 8 is a flow control valve.
  • the opening degree of this flow control valve the refrigerant in internal heat exchanger 5 can be reliably gasified. Further, by controlling the opening degree of the flow control valve, the accuracy in controlling the amount of liquid refrigerant stored in receiver 6 can be improved.
  • internal heat exchanger 5 is configured such that the flow of the refrigerant flowing through first path 51 is counter to the flow of the refrigerant flowing through second path 52. This can facilitate superheated gasification of the refrigerant in internal heat exchanger 5.
  • the refrigerant is carbon dioxide. Since carbon dioxide is high-pressure refrigerant used in a supercritical pressure condition, such carbon dioxide is higher in pressure than the refrigerant other than high-pressure refrigerant such as R32. In refrigeration cycle apparatus 100 according to the embodiment, since receiver 6 can be reduced in size, a container can be relatively increased in thickness. Thereby, the resistance to pressure in receiver 6 can be enhanced, and thus, carbon dioxide can be suitably used as refrigerant.
  • gas-liquid separation circuit 102 is connected to refrigerant circuit 101 between condenser 2 and decompression device 3, and to compressor 1. This eliminates the need to install accumulator 20 in refrigerant circuit 101 for suppressing the liquid refrigerant from flowing into compressor 1. Therefore, refrigeration cycle apparatus 100 can be simplified in structure.
  • the flow ratio of the refrigerant flowing through internal heat exchanger 5 and receiver 6 can be adjusted by adjusting the opening degrees of first valve 7 and third valve 9.
  • gas-liquid separation circuit 102 is connected to refrigerant circuit 101 between condenser 2 and decompression device 3, and to refrigerant circuit 101 between compressor 1 and evaporator 4.
  • gas-liquid separation circuit 102 is not connected to the intermediate pressure side of compressor 1, the degree of freedom in designing of compressor 1 can be improved. Therefore, the degree of freedom in designing of refrigeration cycle apparatus 100 can be improved.
  • the liquid refrigerant having flowed out of gas-liquid separation circuit 102 can be suppressed from flowing into the inlet of compressor 1.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Compression-Type Refrigeration Machines With Reversible Cycles (AREA)
EP21922799.8A 2021-01-27 2021-01-27 Dispositif à cycle de réfrigération Pending EP4286774A4 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2021/002784 WO2022162775A1 (fr) 2021-01-27 2021-01-27 Dispositif à cycle de réfrigération

Publications (2)

Publication Number Publication Date
EP4286774A1 true EP4286774A1 (fr) 2023-12-06
EP4286774A4 EP4286774A4 (fr) 2024-03-27

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Application Number Title Priority Date Filing Date
EP21922799.8A Pending EP4286774A4 (fr) 2021-01-27 2021-01-27 Dispositif à cycle de réfrigération

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Country Link
EP (1) EP4286774A4 (fr)
JP (1) JP7450772B2 (fr)
CN (1) CN116685814A (fr)
WO (1) WO2022162775A1 (fr)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7424807B2 (en) * 2003-06-11 2008-09-16 Carrier Corporation Supercritical pressure regulation of economized refrigeration system by use of an interstage accumulator
KR20080106311A (ko) * 2006-03-29 2008-12-04 산요덴키가부시키가이샤 냉동 장치
EP2165124A4 (fr) * 2007-05-14 2013-05-29 Carrier Corp Système à compression à vapeur de réfrigérant ayant un économiseur à ballon de détente
JP2010127531A (ja) * 2008-11-27 2010-06-10 Mitsubishi Electric Corp 冷凍空調装置
BR112015006703A2 (pt) * 2012-09-28 2017-07-04 Electrolux Home Products Corp Nv refrigerador
US10508835B2 (en) * 2014-07-23 2019-12-17 Mitsubishi Electric Corporation Refrigeration cycle apparatus
CN113692517B (zh) 2019-04-10 2022-12-23 三菱电机株式会社 室外单元、制冷循环装置及制冷机

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EP4286774A4 (fr) 2024-03-27
WO2022162775A1 (fr) 2022-08-04
JP7450772B2 (ja) 2024-03-15
JPWO2022162775A1 (fr) 2022-08-04
CN116685814A (zh) 2023-09-01

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