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CN116685814A - Refrigeration cycle device - Google Patents

Refrigeration cycle device Download PDF

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Publication number
CN116685814A
CN116685814A CN202180089921.8A CN202180089921A CN116685814A CN 116685814 A CN116685814 A CN 116685814A CN 202180089921 A CN202180089921 A CN 202180089921A CN 116685814 A CN116685814 A CN 116685814A
Authority
CN
China
Prior art keywords
refrigerant
valve
heat exchanger
gas
refrigeration cycle
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
CN202180089921.8A
Other languages
Chinese (zh)
Inventor
石川智隆
野本宗
田中航祐
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 CN116685814A publication Critical patent/CN116685814A/en
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

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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)

Abstract

A refrigeration cycle device (100) is provided with a refrigerant circuit (101) and a gas-liquid separation circuit (102). The gas-liquid separation circuit (102) includes an internal heat exchanger (5), a liquid reservoir (6), a 1 st valve (7), and a 2 nd valve (8). The internal heat exchanger (5) has a 1 st passage (51) and a 2 nd passage (52). The gas-liquid separation circuit (102) includes a 1 st flow path (P1) and a 2 nd flow path (P2). The 2 nd flow path (P2) is configured to branch from the 1 st flow path (P1) between the internal heat exchanger (5) and the accumulator (6), and merges into the 1 st flow path (P1) between the 1 st valve (7) and the refrigerant circuit (101).

Description

Refrigeration cycle device
Technical Field
The present disclosure relates to a refrigeration cycle apparatus.
Background
In the refrigeration cycle apparatus, surplus refrigerant is generated due to an operation state, an outside air temperature, and the like. For example, japanese patent application laid-open No. 2020/208752 (patent document 1) describes a refrigeration cycle apparatus in which a gas-liquid two-phase refrigerant is separated into a gas refrigerant and a liquid refrigerant, and the remaining refrigerant is stored in an accumulator as the liquid refrigerant. A refrigerant inlet and a gas outlet are provided at the upper end of the accumulator. A refrigerant outlet is provided at the lower end of the accumulator.
Prior art literature
Patent literature
Patent document 1: international publication No. 2020/208752
Disclosure of Invention
Problems to be solved by the invention
In the refrigeration cycle apparatus described above, when the liquid refrigerant stored in the accumulator increases, the liquid level of the liquid refrigerant rises, and the liquid refrigerant flows out from the gas discharge port provided at the upper end of the accumulator. Therefore, the gas-liquid separation efficiency is lowered. In order to avoid a decrease in the gas-liquid separation efficiency, it is necessary to enlarge the accumulator so that the liquid refrigerant does not flow out from the gas discharge port even if the liquid refrigerant stored in the accumulator increases.
The present disclosure has been made in view of the above-described problems, and an object thereof is to provide a refrigeration cycle device capable of reliably performing gas-liquid separation of a refrigerant and miniaturizing a receiver.
Means for solving the problems
The refrigeration cycle device of the present disclosure is provided with a refrigerant circuit and a gas-liquid separation circuit. The refrigerant circuit includes a compressor that compresses a refrigerant, a condenser that condenses the refrigerant discharged from the compressor, a pressure reducing device that reduces pressure of the refrigerant flowing out of the condenser, and an evaporator that evaporates the refrigerant flowing out of the pressure reducing device. The gas-liquid separation circuit is connected to a refrigerant circuit between the condenser and the pressure reducing device, and to a refrigerant circuit between the compressor or 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 1 st valve configured to adjust a flow rate of the refrigerant flowing out of the receiver, and a 2 nd valve connected to the internal heat exchanger and the receiver. The internal heat exchanger has a 1 st passage through which the refrigerant flowing out of the condenser flows, and a 2 nd passage through which the refrigerant flowing out of the 1 st passage flows, and is configured to exchange heat between the refrigerant flowing in the 1 st passage and the refrigerant flowing in the 2 nd passage. The gas-liquid separation circuit includes a 1 st flow path having a 1 st flow path of the internal heat exchanger, a reservoir, and a 1 st valve, and a 2 nd flow path having a 2 nd flow path of the internal heat exchanger and a 2 nd valve. The 2 nd flow path is branched from the 1 st flow path between the internal heat exchanger and the accumulator, and merges with the 1 st flow path between the 1 st valve and the refrigerant circuit.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the refrigeration cycle apparatus of the present disclosure, the gas-liquid separation of the refrigerant can be reliably performed by the gas-liquid separation circuit, and the accumulator can be miniaturized.
Drawings
Fig. 1 is a refrigerant circuit diagram of a refrigeration cycle device according to an embodiment.
Fig. 2 is a refrigerant circuit diagram illustrating an operation of the refrigeration cycle apparatus according to the embodiment.
Fig. 3 is a refrigerant circuit diagram of modification 1 of the refrigeration cycle apparatus according to the embodiment.
Fig. 4 is a refrigerant circuit diagram of modification 2 of the refrigeration cycle apparatus of the embodiment.
Fig. 5 is a refrigerant circuit diagram of the refrigeration cycle apparatus of the comparative example.
Detailed Description
Hereinafter, embodiments will be described with reference to the drawings. In the following, the same or corresponding parts are denoted by the same reference numerals, and a repetitive description thereof will not be made.
The structure of the refrigeration cycle apparatus 100 according to embodiment 1 will be described with reference to fig. 1. Fig. 1 is a refrigerant circuit diagram of a refrigeration cycle apparatus 100 according to an embodiment. The refrigeration cycle apparatus 100 of the embodiment is, for example, a refrigerator.
As shown in fig. 1, a refrigeration cycle apparatus 100 according to an embodiment includes a refrigerant circuit 101, a gas-liquid separation circuit 102, and a control device 103. The refrigerant circulated in the refrigeration cycle apparatus 100 is, for example, carbon dioxide (CO) 2 )。
The refrigerant circuit 101 includes a compressor 1, a condenser 2, a pressure reducing device 3, and an evaporator 4. The compressor 1, the condenser 2, the pressure reducing device 3, and the evaporator 4 are connected by piping, thereby forming a refrigerant circuit 101. The refrigerant circuit 101 is configured such that the refrigerant flows in the order of the compressor 1, the condenser 2, the pressure reducing device 3, and the evaporator 4.
The compressor 1 is configured to compress a refrigerant. The compressor 1 is configured to suck a refrigerant, compress the refrigerant, and then discharge the compressed refrigerant. The compressor 1 compresses a refrigerant to be in a high-temperature and high-pressure state. In the present embodiment, the compressor 1 includes an injection port provided in the intermediate pressure portion.
The compressor 1 may be configured to have a variable capacity. The compressor 1 may be configured to change the capacity by changing the frequency and adjusting the rotation speed based on an instruction from the control device 103.
The condenser 2 is configured to condense the refrigerant discharged from the compressor 1. The condenser 2 is configured to cool and condense the refrigerant discharged from the compressor 1. The condenser 2 is, for example, a fin-tube heat exchanger having a plurality of fins and a heat transfer tube penetrating the plurality of fins.
The pressure reducing device 3 is configured to reduce the pressure of the refrigerant flowing out of the condenser 2. The pressure reducing device 3 is an expansion valve. The pressure reducing device 3 is, for example, a solenoid valve. The pressure reducing device 3 is configured to be able to adjust the flow rate of the refrigerant based on an instruction from the control device 103.
The evaporator 4 is configured to evaporate the refrigerant flowing out of the pressure reducing device 3. The evaporator 4 is configured to heat and evaporate the refrigerant flowing out from the pressure reducing device 3. The evaporator 4 is, for example, a fin-tube heat exchanger having a plurality of fins and a heat transfer tube penetrating the plurality of fins.
The gas-liquid separation circuit 102 is connected to the refrigerant circuit 101 between the condenser 2 and the pressure reducing device 3 and the refrigerant circuit 101 between the compressor 1 or the compressor 1 and the evaporator 4. In the present embodiment, the gas-liquid separation circuit 102 is connected to the refrigerant circuit 101 between the condenser 2 and the pressure reducing device 3, and the compressor 1. Specifically, the gas-liquid separation circuit 102 is connected to a pipe of the refrigerant circuit 101 between the condenser 2 and the pressure reducing device 3 and to the intermediate pressure side of the compressor 1.
The gas-liquid separation circuit 102 includes an internal heat exchanger 5, a receiver 6, a 1 st valve 7, and a 2 nd valve 8. The internal heat exchanger 5, the accumulator 6, the 1 st valve 7, the 2 nd valve 8, and the piping constitute a gas-liquid separation mechanism 10. The inlet 11 of the gas-liquid separation mechanism 10 is connected to the refrigerant circuit 101 between the condenser 2 and the pressure reducing device 3. The branch portion 12 of the gas-liquid separation mechanism 10 is disposed between the internal heat exchanger 5, the accumulator 6, and the 2 nd valve 8. The merging portion 13 of the gas-liquid separation mechanism 10 is disposed between the internal heat exchanger 5, the 1 st valve 7, and the outlet 14 of the gas-liquid separation mechanism 10. The outlet 14 of the gas-liquid separation mechanism 10 is connected to the compressor 1 or the refrigerant circuit 101 between the compressor 1 and the evaporator 4.
The internal heat exchanger 5 is connected to the refrigerant circuit 101 between the condenser 2 and the pressure reducing device 3 through piping. The internal heat exchanger 5 includes a 1 st passage 51 and a 2 nd passage 52. The 1 st passage 51 is configured to allow the refrigerant flowing out of the condenser 2 to flow. The 2 nd passage 52 is configured to allow the refrigerant flowing out of the 1 st passage 51 to flow. The internal heat exchanger 5 is configured to exchange heat between the refrigerant flowing through the 1 st passage 51 and the refrigerant flowing through the 2 nd passage 52. In the present embodiment, the internal heat exchanger 5 is configured such that the flow of the refrigerant flowing through the 1 st passage 51 is opposed to the flow of the refrigerant flowing through the 2 nd passage 52. That is, the internal heat exchanger 5 is configured to convect the flow of the refrigerant flowing through the 1 st passage 51 and the 2 nd passage 52. The internal heat exchanger 5 is disposed upstream of the accumulator 6 in the flow of the refrigerant.
The accumulator 6 is connected to the internal heat exchanger 5, the 1 st valve 7, and the 2 nd valve 8 via pipes. A refrigerant inlet 6a is provided at an upper end of the accumulator 6. A refrigerant outlet 6b is provided at the lower end of the accumulator 6. The accumulator 6 is configured to be able to store the refrigerant flowing out of the internal heat exchanger 5. The accumulator 6 is configured to be capable of storing the liquefied liquid refrigerant. The accumulator 6 is configured to be able to store the remaining refrigerant.
The 1 st valve 7 is connected to the refrigerant outlet 6b of the accumulator 6 through a pipe. The 1 st valve 7 is configured to be able to adjust the flow rate of the refrigerant flowing out of the accumulator 6. The 1 st valve 7 is, for example, a flow rate adjustment valve. The 1 st valve 7 is, for example, a solenoid valve.
The 2 nd valve 8 is connected to the internal heat exchanger 5 and the accumulator 6. The 2 nd valve 8 is connected to the 1 st passage 51 of the internal heat exchanger 5, the refrigerant inlet 6a of the accumulator 6, and the 2 nd passage 52 of the internal heat exchanger 5 by piping. The 2 nd valve 8 is, for example, an on-off valve. The 2 nd valve 8 may be a flow rate adjustment valve, for example. The 2 nd valve 8 is, for example, a solenoid valve.
The gas-liquid separation circuit 102 includes a 1 st flow path P1 and a 2 nd flow path P2. The 1 st flow path P1 has a 1 st flow path 51 of the internal heat exchanger 5, a reservoir 6, and a 1 st valve 7. The 1 st flow path P1 is configured to allow the refrigerant to flow in the order of the 1 st flow path 51, the accumulator 6, and the 1 st valve 7 of the internal heat exchanger 5. The 2 nd flow path P2 has a 2 nd flow path 52 of the internal heat exchanger 5 and a 2 nd valve 8. The 2 nd flow path P2 is configured to allow the refrigerant to flow in the order of the 2 nd valve 8 and the 2 nd passage 52 of the internal heat exchanger 5.
The 1 st flow path P1 is connected to the refrigerant circuit 101 between the condenser 2 and the pressure reducing device 3 and the refrigerant circuit 101 between the compressor 1 or the compressor 1 and the evaporator 4. The 2 nd flow path P2 is branched from the 1 st flow path P1 between the internal heat exchanger 5 and the accumulator 6, and merges with the 1 st flow path P1 between the 1 st valve 7 and the refrigerant circuit 101. The 2 nd flow path P2 is branched from the 1 st flow path P1 at the branching portion 12, and merges with the 1 st flow path P1 at the merging portion 13.
The control device 103 is configured to control the entire refrigeration cycle apparatus 100. The control device 103 is configured to control the refrigerant circuit 101 and the gas-liquid separation circuit 102. The control device 103 is configured to control the compressor 1 and the pressure reducing device 3 in the refrigerant circuit 101. The control device 103 is configured to control the opening degrees of the 1 st valve 7 and the 2 nd valve 8 in the gas-liquid separation circuit 102. The control device 103 is constituted by a microcomputer, for example. The control device 103 includes a CPU (Central Processing Unit: central processing unit), a RAM (Random Access Memory: random access Memory), a ROM (Read Only Memory), and the like. A control program is stored in the ROM.
Next, the operation of the refrigeration cycle apparatus 100 according to the embodiment will be described.
The operation of the refrigeration cycle apparatus 100 according to the embodiment during operation will be described with reference to fig. 2. Fig. 2 is a refrigerant circuit diagram illustrating an operation of the refrigeration cycle apparatus 100 according to the embodiment in operation. In fig. 2, arrows marked in the refrigerant circuit 101 and the gas-liquid separation circuit 102 indicate the flow of the refrigerant.
First, the flow of the refrigerant flowing through the refrigerant circuit 101 will be described. The refrigerant flowing into the compressor 1 is compressed by the compressor 1 to become a high-temperature and high-pressure gas refrigerant, and is discharged from the compressor 1. The high-temperature and high-pressure gas refrigerant flows into the condenser 2, is condensed by the condenser 2, becomes a liquid refrigerant, and flows out of the condenser 2. A part of the liquid refrigerant flows into the pressure reducing device 3, is reduced in pressure by the pressure reducing device 3, becomes a low-pressure gas-liquid two-phase refrigerant, and flows out of the pressure reducing device 3. The low-pressure gas-liquid two-phase refrigerant flows into the evaporator 4, and is evaporated by the evaporator 4 to become a gas refrigerant. The gas refrigerant flows into the compressor 1. In this way, the refrigerant circulates in the refrigerant circuit 101.
Next, the flow of the refrigerant flowing through the gas-liquid separation circuit 102 will be described. A part of the refrigerant flowing out of the condenser 2 flows into the gas-liquid separation circuit 102 from the refrigerant circuit 101. The refrigerant flowing into the gas-liquid separation circuit 102 flows into the 1 st passage 51 of the internal heat exchanger 5, exchanges heat with the refrigerant flowing through the 2 nd passage 52, and flows out of the internal heat exchanger 5. A part of the refrigerant flowing out of the 1 st passage 51 of the internal heat exchanger 5 flows into the accumulator 6 through the 1 st flow path P1. In the refrigerant circuit 101, surplus refrigerant is generated due to the operation state of the refrigeration cycle apparatus 100, the outside air temperature, and the like. A liquid refrigerant as the surplus refrigerant is stored in the accumulator 6. If the liquid refrigerant stored in the accumulator 6 is required due to the operating state of the refrigeration cycle apparatus 100, the outside air temperature, and the like, the liquid refrigerant flows out of the accumulator 6 and flows into the intermediate pressure side of the compressor 1 through the 1 st valve 7.
A part of the refrigerant flowing out of the 1 st passage 51 of the internal heat exchanger 5 flows into the 2 nd passage 52 of the internal heat exchanger 5 from the branch portion 12 of the gas-liquid separation mechanism 10 through the 2 nd valve 8, exchanges heat with the refrigerant flowing through the 1 st passage 51, and flows out of the internal heat exchanger 5. The refrigerant flowing through the 2 nd passage 52 of the internal heat exchanger 5 is depressurized to become a superheated gas refrigerant. The superheated gas refrigerant flowing out of the 2 nd passage 52 of the internal heat exchanger 5 merges with the liquid refrigerant flowing out of the accumulator 6 at the merging portion 13 of the gas-liquid separation mechanism 10 and then flows into the intermediate pressure side of the compressor 1. In this way, the refrigerant flows in the gas-liquid separation circuit 102.
When the opening degree of the 1 st valve 7 increases, the liquid refrigerant flows out from the accumulator 6, and thereby the amount of the liquid refrigerant stored in the accumulator 6 decreases. When the opening degree of the 2 nd valve 8 increases, the gas refrigerant escapes from the accumulator 6, and thus, the amount of the liquid refrigerant stored in the accumulator 6 increases. In this way, the storage amount of the liquid refrigerant in the accumulator 6 is controlled by controlling the opening degrees of the 1 st valve 7 and the 2 nd valve 8.
Next, a modification of the refrigeration cycle apparatus 100 according to the embodiment will be described. A modification of the refrigeration cycle apparatus 100 according to the embodiment has the same configuration and operation as those of the refrigeration cycle apparatus 100 according to the embodiment unless otherwise specified.
With reference to fig. 3, a modification 1 of the refrigeration cycle apparatus 100 according to the embodiment will be described. Fig. 3 is a refrigerant circuit diagram of modification 1 of the refrigeration cycle apparatus 100 according to the embodiment. In modification 1 of the refrigeration cycle apparatus 100 of the embodiment, the gas-liquid separation circuit 102 further includes the 3 rd valve 9. The 3 rd valve 9 is, for example, a flow rate adjustment valve. The 3 rd valve 9 is, for example, a solenoid valve. The 3 rd valve 9 is disposed between the refrigerant circuit 101 and the internal heat exchanger 5.
In modification 1 of the refrigeration cycle apparatus 100 of the embodiment, a part of the refrigerant flowing out of the condenser 2 flows into the 1 st passage 51 of the internal heat exchanger 5 through the 3 rd valve 9.
With reference to fig. 4, modification 2 of the refrigeration cycle apparatus 100 of the embodiment will be described. Fig. 4 is a refrigerant circuit diagram of modification 2 of the refrigeration cycle apparatus 100 according to the embodiment. In modification 2 of the refrigeration cycle apparatus 100 of the embodiment, the gas-liquid separation circuit 102 is connected to the refrigerant circuit 101 between the condenser 2 and the pressure reducing device 3 and the refrigerant circuit 101 between the compressor 1 and the evaporator 4.
In modification 2 of the refrigeration cycle apparatus 100 of the embodiment, the refrigerant circuit 101 further includes the accumulator 20.
An accumulator (accumulator) 20 is disposed in the refrigerant circuit 101 between the compressor 1 and the evaporator 4. The gas-liquid separation circuit 102 is connected to the refrigerant circuit 101 between the evaporator 4 and the accumulator 20.
The accumulator 20 is configured to allow the refrigerant flowing out of the evaporator 4 and the gas-liquid separation circuit 102 to flow in. The accumulator 20 is configured to be able to store the refrigerant flowing out of the evaporator 4 and the gas-liquid separation circuit 102.
In modification 2 of the refrigeration cycle apparatus 100 of the embodiment, the refrigerant flowing out of the evaporator 4 and the gas-liquid separation circuit 102 flows into the compressor 1 through the accumulator 20.
Next, the operational effects of the embodiment will be described in comparison with the comparative example.
A refrigeration cycle apparatus 100 of a comparative example will be described with reference to fig. 5. Fig. 5 is a refrigerant circuit diagram of the refrigeration cycle apparatus 100 of the comparative example. In the refrigeration cycle apparatus 100 of the comparative example, the gas-liquid separation circuit 102 does not include the internal heat exchanger 5. A refrigerant inlet 6a and a gas discharge 6c are provided at the upper end of the accumulator 6. A refrigerant outlet 6b is provided at the lower end of the accumulator 6. In the refrigeration cycle apparatus 100 of the comparative example, when the liquid refrigerant stored in the accumulator 6 increases, the liquid level of the liquid refrigerant rises, and the liquid refrigerant flows out from the gas discharge port 6c provided at the upper end of the accumulator 6. Therefore, the gas-liquid separation efficiency is lowered. In order to avoid a decrease in the gas-liquid separation efficiency, it is necessary to enlarge the accumulator 6 so that the liquid refrigerant does not flow out from the gas discharge port even if the liquid refrigerant stored in the accumulator 6 increases.
In contrast, according to the refrigeration cycle apparatus 100 of the embodiment, by removing the gas discharge port 6c of the accumulator 6, even if the liquid refrigerant stored in the accumulator 6 increases to raise the liquid level of the liquid refrigerant, the liquid refrigerant can be prevented from flowing out of the gas discharge port 6c of the accumulator 6. The gas refrigerant can be separated by decompressing the refrigerant in the internal heat exchanger 5. Therefore, the gas-liquid separation of the refrigerant can be reliably performed. Further, even if the liquid refrigerant stored in the accumulator 6 increases to raise the liquid level of the liquid refrigerant, the liquid refrigerant can be prevented from flowing out of the gas discharge port 6c of the accumulator 6, and therefore the liquid refrigerant can be stored in the upper end of the accumulator 6. Therefore, the size of the accumulator 6 that can store the same amount of liquid refrigerant can be reduced. Therefore, the reservoir 6 can be miniaturized. Therefore, according to the refrigeration cycle apparatus 100 of the embodiment, the gas-liquid separation of the refrigerant can be reliably performed by the gas-liquid separation circuit 102, and the accumulator 6 can be miniaturized.
In the refrigeration cycle device 100 according to the embodiment, the amount of refrigerant in the accumulator 6 can be controlled, and therefore, the performance can be improved. Further, since the amount of refrigerant in the accumulator 6 can be controlled, the operation range of the refrigeration cycle apparatus 100 can be widened.
According to the refrigeration cycle apparatus 100 of the embodiment, the 2 nd valve 8 is a flow rate adjustment valve. Therefore, by controlling the opening degree of the flow control valve, the refrigerant in the internal heat exchanger 5 can be reliably gasified. Further, by controlling the opening degree of the flow rate adjustment valve, the accuracy of controlling the amount of liquid refrigerant stored in the accumulator 6 can be improved.
According to the refrigeration cycle apparatus 100 of the embodiment, the internal heat exchanger 5 is configured such that the flow of the refrigerant flowing through the 1 st passage 51 is opposed to the flow of the refrigerant flowing through the 2 nd passage 52. Therefore, the superheated gas of the refrigerant in the internal heat exchanger 5 can be promoted.
According to the refrigeration cycle apparatus 100 of the embodiment, the refrigerant is carbon dioxide. Carbon dioxide is a high-pressure refrigerant used in a supercritical pressure state, and therefore, for example, the pressure is higher than a refrigerant other than a high-pressure refrigerant such as R32. In the refrigeration cycle apparatus 100 of the embodiment, the accumulator 6 can be miniaturized, and therefore, the wall thickness of the container can be relatively increased. This can improve the pressure resistance of the accumulator 6, and therefore, carbon dioxide can be suitably used as the refrigerant.
According to the refrigeration cycle apparatus 100 of the embodiment, the gas-liquid separation circuit 102 is connected to the refrigerant circuit 101 between the condenser 2 and the pressure reducing device 3, and the compressor 1. Therefore, the refrigerant circuit 101 may not be provided with the accumulator 20 for suppressing the inflow of the liquid refrigerant into the compressor 1. Therefore, the structure of the refrigeration cycle apparatus 100 can be simplified.
According to modification 1 of the refrigeration cycle apparatus 100 of the embodiment, the flow rate ratio of the refrigerant flowing through the internal heat exchanger 5 and the accumulator 6 can be adjusted by adjusting the opening of the 1 st valve 7 and the opening of the 3 rd valve 9.
According to modification 2 of the refrigeration cycle apparatus 100 of the embodiment, the gas-liquid separation circuit 102 is connected to the refrigerant circuit 101 between the condenser 2 and the pressure reducing device 3 and the refrigerant circuit 101 between the compressor 1 and the evaporator 4. Therefore, the gas-liquid separation circuit 102 is not connected to the intermediate pressure side of the compressor 1, and thus the degree of freedom in design of the compressor 1 can be improved. Therefore, the degree of freedom in designing the refrigeration cycle apparatus 100 can be improved.
According to modification 2 of the refrigeration cycle apparatus 100 of the embodiment, the refrigerant flowing out of the gas-liquid separation circuit 102 flows into the compressor 1 through the accumulator 20, and therefore, the inflow of the liquid refrigerant flowing out of the gas-liquid separation circuit 102 into the inflow port of the compressor 1 can be suppressed.
The embodiments disclosed herein are illustrative in all respects and should not be considered as limiting. The scope of the present disclosure is shown not by the above description but by the claims, and includes all modifications within the meaning and scope equivalent to the claims.
Description of the reference numerals
The device comprises a compressor 1, a condenser 2, a decompression device 3, an evaporator 4, an internal heat exchanger 5, a liquid storage 6, a valve 1, a valve 2, a valve 3, a gas-liquid separation mechanism 10, an inlet 11, a branch 12, a merging part 13, an outlet 14, a liquid storage 20, a liquid storage 51, a passage 1, a passage 52, a passage 2, a refrigeration cycle device 100, a refrigerant circuit 101, a gas-liquid separation circuit 102 and a control device 103.

Claims (4)

1. A refrigeration cycle apparatus, wherein,
the refrigeration cycle device is provided with:
a refrigerant circuit including a compressor that compresses a refrigerant, a condenser that condenses the refrigerant discharged from the compressor, a pressure reducing device that reduces pressure of the refrigerant flowing out of the condenser, and an evaporator that evaporates the refrigerant flowing out of the pressure reducing device; and
a gas-liquid separation circuit connected to the refrigerant circuit between the condenser and the pressure reducing device and the refrigerant circuit between the compressor or 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 1 st valve configured to adjust a flow rate of the refrigerant flowing out of the receiver, and a 2 nd valve connected to the internal heat exchanger and the receiver,
the internal heat exchanger has a 1 st passage through which the refrigerant flowing out of the condenser flows, and a 2 nd passage through which the refrigerant flowing out of the 1 st passage flows, and is configured to exchange heat between the refrigerant flowing in the 1 st passage and the refrigerant flowing in the 2 nd passage,
the gas-liquid separation circuit includes a 1 st flow path having the 1 st flow path of the internal heat exchanger, the accumulator, and the 1 st valve, and a 2 nd flow path having the 2 nd flow path of the internal heat exchanger and the 2 nd valve,
the 2 nd flow path is branched from the 1 st flow path between the internal heat exchanger and the accumulator, and merges with the 1 st flow path between the 1 st valve and the refrigerant circuit.
2. The refrigeration cycle apparatus according to claim 1, wherein,
the 2 nd valve is a flow regulating valve.
3. A refrigeration cycle apparatus according to claim 1 or 2, wherein,
the internal heat exchanger is configured such that the flow of the refrigerant flowing through the 1 st passage and the flow of the refrigerant flowing through the 2 nd passage are opposed to each other.
4. A refrigeration cycle apparatus according to any one of claims 1 to 3, wherein,
the refrigerant is carbon dioxide.
CN202180089921.8A 2021-01-27 2021-01-27 Refrigeration cycle device Pending CN116685814A (en)

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US7424807B2 (en) * 2003-06-11 2008-09-16 Carrier Corporation Supercritical pressure regulation of economized refrigeration system by use of an interstage accumulator
KR20080106311A (en) * 2006-03-29 2008-12-04 산요덴키가부시키가이샤 Freezing apparatus
WO2008140454A1 (en) * 2007-05-14 2008-11-20 Carrier Corporation Refrigerant vapor compression system with flash tank economizer
JP2010127531A (en) * 2008-11-27 2010-06-10 Mitsubishi Electric Corp Refrigeration air conditioner
KR20150065173A (en) * 2012-09-28 2015-06-12 일렉트로룩스 홈 프로덕츠 코오포레이션 엔.브이. Refrigerator
WO2016013077A1 (en) * 2014-07-23 2016-01-28 三菱電機株式会社 Refrigeration cycle device
WO2020208752A1 (en) 2019-04-10 2020-10-15 三菱電機株式会社 Outdoor unit, refrigeration cycle device, and refrigerating machine

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JPWO2022162775A1 (en) 2022-08-04
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EP4286774A4 (en) 2024-03-27
WO2022162775A1 (en) 2022-08-04

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