Double-fluid refrigeration and heat pump circulation system and flow reversing heat transfer device

Abstract

The invention relates to a double-fluid refrigeration and heat pump circulating system and a flow reversing heat transfer device, the system comprises a compressor, after first fluid and second fluid are pressurized by the compressor and internally separated, the output first fluid is guided into a first channel of a four-way reversing valve and then enters a first branch of a first heat exchanger for cooling; after flowing through the flow reversing heat transfer device, continuously releasing heat, cooling, throttling and reducing pressure, flowing out of the first channel, entering the second heat exchanger for absorbing heat, then being guided into the second channel of the four-way reversing valve, returning to the second channel of the flow reversing heat transfer device for absorbing heat and heating, and flowing out of the second channel and entering the compressor; mixing with the second fluid at an air suction port of the compressor; after being separated from the first fluid in the compressor, the second fluid enters the second branch of the first heat exchanger through the independent pipeline to be cooled, pressure energy of the second fluid is recycled through the energy recycling device, and finally the second fluid is mixed with the first fluid at an air suction port of the compressor. The method can give full play to the advantages of near isothermal compression of the system.

Description

Technical Field

[0001] The invention belongs to the technical field of refrigeration and heat pumps, and in particular relates to a dual-fluid refrigeration and heat pump circulation system and a flow reversing heat transfer device. Background Art

[0002] Refrigeration and heat pump technology is a key technology for the progress of modern society and plays an important role in improving people's living comfort. In the refrigeration and heat pump circulation system, the refrigeration compressor is the main energy-consuming component. When compressing the refrigerant, the refrigeration compressor cannot follow the isothermal compression process of the ideal reverse Carnot cycle, resulting in a large amount of energy consumption being wasted.

[0003] In the prior art, the patent application with publication number CN105241105A proposes "a refrigeration system based on oil-cooled compression cycle", which discloses an approximate isothermal compression technology. By adjusting the oil injection amount and utilizing the lubricating oil to absorb the compression heat, the exhaust temperature of the compressor is reduced, and the isentropic efficiency and isochoric efficiency of the compressor are improved. Through the first regenerator, the system advantages of oil-cooled approximate isothermal compression are brought into play to improve the system performance, while through the second regenerator, the influence of the solubility of the refrigerant oil on the system performance is reduced, and the actual performance of the system is improved. Although this technical solution improves the system efficiency to a certain extent, the additional third heat exchanger increases the complexity of the system. In addition, in this technical solution, the process of the compressor lubricating oil from low pressure to high pressure requires a large amount of energy consumption, which affects the further improvement of the system efficiency. Summary of the invention

[0004] The purpose of the present invention is to address the problems in the above-mentioned prior art and provide a dual-fluid refrigeration and heat pump circulation system and a flow reversing heat transfer device to improve the circulation energy efficiency of the refrigeration and heat pump system and give full play to the advantages of near-isothermal compression.

[0005] In order to achieve the above object, the present invention has the following technical solutions: In a first aspect, a dual-fluid refrigeration and heat pump circulation system is provided, comprising a compressor, a first heat exchanger, a flow reversing heat transfer device, a second heat exchanger, a four-way reversing valve, and an energy recovery device; A first fluid and a second fluid are introduced into the compressor. After the first fluid and the second fluid are pressurized and separated internally by the compressor, the output first fluid is introduced into the first channel of the four-way reversing valve and then enters the first branch of the first heat exchanger for cooling, and then flows through the flow reversing heat transfer device to continue to release heat and cool down and throttle and reduce pressure, and then flows out from the first channel of the flow reversing heat transfer device to enter the second heat exchanger for absorbing heat, and then introduced into the second channel of the four-way reversing valve and returns to the second channel of the flow reversing heat transfer device to absorb heat and heat up, and then flows out from the second channel of the flow reversing heat transfer device to enter the compressor, and mixes with the second fluid at the air intake of the compressor to form a first fluid circulation path; after the second fluid is separated from the first fluid inside the compressor, it enters the second branch of the first heat exchanger through an independent pipeline to cool down, and the pressure energy of the second fluid is recovered by the energy recovery device, and finally mixed with the first fluid at the air intake of the compressor to form a second fluid circulation path.

[0006] As a preferred solution, the ratio of the mass flow rate of the second fluid to the sum of the mass flow rates of the first fluid and the second fluid is adjustable between 0 and 90%.

[0007] As a preferred solution, the energy recovery device adopts a liquid expander.

[0008] Furthermore, the energy recovery device is integrated inside the compressor to form a compression-expansion integrated machine.

[0009] As a preferred solution, the first fluid is a low greenhouse effect refrigerant, and the low greenhouse effect refrigerant includes any one or more combinations of HC refrigerants, HFO refrigerants or CO2; The second fluid is lubricating oil.

[0010] In a second aspect, a flow reversing heat transfer device is provided, comprising a flow reversing device, a third heat exchanger and a flow control device connected by pipelines, wherein the flow reversing device is composed of four one-way valves connected together by pipelines, and the flow reversing device has four interfaces, a first port and a second port of the flow reversing device are respectively located in the middle of two groups of one-way valves connected in sequence, and a third port and a fourth port of the flow reversing device are respectively located in the middle of two one-way valves arranged in the same direction and in the opposite direction; a first channel and a second channel of the flow reversing heat transfer device are established by the flow reversing device and the third heat exchanger, and interfaces are led out.

[0011] As a preferred scheme, the first one-way valve and the second one-way valve of the flow reversing device are connected in sequence, the third one-way valve and the fourth one-way valve are connected in sequence, the first one-way valve and the third one-way valve are arranged in opposite directions, and the second one-way valve and the fourth one-way valve are arranged in the same direction; the first port of the flow reversing device is led out from the middle of the first one-way valve and the second one-way valve, the second port of the flow reversing device is led out from the middle of the third one-way valve and the fourth one-way valve, the third port of the flow reversing device is led out from the middle of the second one-way valve and the fourth one-way valve, and the fourth port of the flow reversing device is led out from the middle of the first one-way valve and the third one-way valve.

[0012] As a preferred solution, two flow reversing devices are provided, the first flow reversing device is connected to the third heat exchanger and the flow control device through a pipeline, and the second flow reversing device is connected in parallel to the third heat exchanger; the first port and the second port of the two flow reversing devices serve as outlet interfaces of the first channel and the second channel respectively; the third port and the fourth port of the first flow reversing device are respectively connected to the first branch of the third heat exchanger and the flow control device; the third port and the fourth port of the second flow reversing device are respectively connected to the inlet and the outlet of the second branch of the third heat exchanger.

[0013] As a preferred solution, the flow reversing device is provided with a third port and a fourth port of the flow reversing device, respectively connected to the first branch of the third heat exchanger and the flow control device, and the first port and the second port of the flow reversing device and the inlet and the outlet of the second branch of the third heat exchanger respectively serve as outlet interfaces of the first channel and the second channel.

[0014] As a preferred solution, the flow control device is a throttle valve or a capillary tube.

[0015] Compared with the prior art, the dual-fluid refrigeration and heat pump circulation system of the present invention has at least the following beneficial effects: The dual-fluid refrigeration and heat pump circulation system of the present invention introduces a first fluid and a second fluid into the compressor, the first fluid and the second fluid are pressurized and separated internally by the compressor, and the second fluid is used to cool the first fluid inside the compressor to achieve near-isothermal compression, thereby achieving the effect of saving compressor energy consumption. The first fluid output by the compressor is introduced into the first channel of the four-way reversing valve and then enters the first branch of the first heat exchanger for cooling, and then flows through the flow reversing heat transfer device to continue to release heat and cool down and throttle and reduce pressure, and then flows out from the first channel of the flow reversing heat transfer device to enter the second heat exchanger for heat absorption, and then introduced into the second channel of the four-way reversing valve and returns to the second channel of the flow reversing heat transfer device for heat absorption and temperature increase, and then flows out from the second channel of the flow reversing heat transfer device to enter the compressor, and mixes with the second fluid at the air intake of the compressor, so that the temperature of the first fluid at the air intake of the compressor is further increased, thereby improving the near-isothermal compression effect and preventing the first fluid from failing due to phase change. After the second fluid of the refrigeration and heat pump circulation system of the present invention is separated from the first fluid inside the compressor, it enters the second branch of the first heat exchanger through an independent pipeline for cooling, and the pressure energy of the second fluid is recovered through the energy recovery device, and finally mixed with the first fluid at the air intake of the compressor. The first heat exchanger has two branches and has the advantage of compact structure. The dual-fluid refrigeration and heat pump circulation system of the present invention has a simple structure, is easy to implement, and can give full play to the advantages of near-isothermal compression.

[0016] Compared with the prior art, the flow reversing heat transfer device of the present invention includes a flow reversing device, a third heat exchanger and a flow control device connected by pipelines. The first port and the second port of the flow reversing device are respectively between two groups of one-way valves connected in sequence, and the third port and the fourth port of the flow reversing device are respectively between two one-way valves arranged in the same direction and in the opposite direction. The first channel and the second channel of the flow reversing heat transfer device are established by the flow reversing device and the third heat exchanger, and an interface is led out, so that the first fluid of the dual-fluid refrigeration and heat pump circulation system, whether entering from the first port or the second port, first flows through the third heat exchanger and then flows through the flow control device, thereby preventing the first fluid from flowing back when the circulation switches from the refrigeration condition to the heating condition, thereby preventing the system from failing due to the backflow of the first fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 A schematic diagram of the structure of a dual-fluid refrigeration and heat pump circulation system according to an embodiment of the present invention; Figure 2A schematic structural diagram of a flow reversing device according to an embodiment of the present invention; Figure 3 A schematic structural diagram of a flow reversing heat transfer device according to an embodiment of the present invention having two flow reversing devices; Figure 4 The flow reversing heat transfer device according to the embodiment of the present invention is provided with a structural schematic diagram of a flow reversing device; In the attached figure: 1. compressor; 2. first heat exchanger; 3. flow control device; 4. second heat exchanger; 5. four-way reversing valve; 6. third heat exchanger; 7. energy recovery device; 9-flow reversing device; 9-1. first port; 9-2. second port; 9-3. third port; 9-4. fourth port; 13-check valve; 36. flow reversing heat transfer device; 36-1. first channel first interface; 36-2. first channel second interface; 36-3. second channel first interface; 36-4. second channel second interface; 36b. flow reversing device with two flow reversing devices 36b-1, 36b-2, 36b-3, 36b-4 are respectively the first channel first interface, the first channel second interface, the second channel first interface, the second channel second interface of the flow reversing heat transfer device with two flow reversing devices; 36c. A flow reversing heat transfer device with one flow reversing device; 36c-1, 36c-2, 36c-3, 36c-4 are respectively the first channel first interface, the first channel second interface, the second channel first interface, the second channel second interface of the flow reversing heat transfer device with one flow reversing device. DETAILED DESCRIPTION

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0020] See also Figure 1In order to improve the energy efficiency of traditional refrigeration and heat pump cycles, an embodiment of the present invention proposes a dual-fluid refrigeration and heat pump cycle system, the main structure of which includes a compressor 1, a first heat exchanger 2, a flow reversing heat transfer device 36, a second heat exchanger 4, a four-way reversing valve 5 and an energy recovery device 7; wherein the first fluid and the second fluid are introduced into the compressor 1, and after the first fluid and the second fluid are pressurized and separated internally by the compressor 1, the output first fluid is introduced into the first channel of the four-way reversing valve 5 and then enters the first branch of the first heat exchanger 2 for cooling, and then flows through the flow reversing heat transfer device 36 to continue to release heat and cool down and throttle and reduce pressure, and then from the flow reversing heat transfer device 3 The fluid flows out of the first channel of the compressor 1 and enters the second heat exchanger 4 to absorb heat, then is introduced into the second channel of the four-way reversing valve 5 and returns to the second channel of the flow reversing heat transfer device 36 to absorb heat and heat up, then flows out from the second channel of the flow reversing heat transfer device 36 and enters the compressor 1, and is mixed with the second fluid at the air intake of the compressor 1 to form a first fluid circulation path; after the second fluid is separated from the first fluid inside the compressor 1, it enters the second branch of the first heat exchanger 2 through an independent pipeline to be cooled, and the pressure energy of the second fluid is recovered by the energy recovery device 7, and finally is mixed with the first fluid at the air intake of the compressor 1 to form a second fluid circulation path.

[0021] Furthermore, the first channel first interface 36-1 and the first channel second interface 36-2 of the flow reversing heat transfer device 36 of the embodiment of the present invention are respectively connected to the outlet of the first heat exchanger 2 and the inlet of the second heat exchanger 4, and the second channel first interface 36-3 and the second channel second interface 36-4 are respectively connected to the outlet of the four-way reversing valve 5 and the suction port of the compressor 1.

[0022] In a possible implementation manner, the ratio of the mass flow rate of the second fluid to the sum of the mass flow rates of the first fluid and the second fluid in the embodiment of the present invention is adjustable between 0 and 90%.

[0023] In a possible implementation, the energy recovery device 7 of the embodiment of the present invention adopts a liquid expander.

[0024] Furthermore, the energy recovery device 7 can be integrated inside the compressor 1 to form a compression-expansion integrated machine.

[0025] In a possible implementation, the first fluid is a low greenhouse effect refrigerant, which includes any one or more combinations of HC refrigerants, HFO refrigerants, or CO2, and the second fluid is lubricating oil.

[0026] See also Figure 2Another embodiment of the present invention further proposes a flow reversing heat transfer device, which structurally includes a flow reversing device 9, a third heat exchanger 6 and a flow control device 3 connected by pipelines, wherein the flow reversing device 9 is composed of four one-way valves 13 connected together by pipelines, and the flow reversing device 9 has four interfaces. The first port 9-1 and the second port 9-2 of the flow reversing device 9 are respectively in the middle of two groups of one-way valves 13 connected in sequence, and the third port 9-3 and the fourth port 9-4 of the flow reversing device 9 are respectively in the middle of two one-way valves 13 arranged in the same direction and in the opposite direction; the first channel and the second channel of the flow reversing heat transfer device 36 are established by the flow reversing device 9 and the third heat exchanger 6, and the interfaces are led out.

[0027] Furthermore, Figure 2 In the embodiment of the present invention shown in , among the four one-way valves 13 of the flow reversing device 9, the first one-way valve of the flow reversing device 9 is connected with the second one-way valve in sequence, the third one-way valve is connected with the fourth one-way valve in sequence, the first one-way valve and the third one-way valve are arranged in opposite directions, and the second one-way valve and the fourth one-way valve are arranged in the same direction; the first port 9-1 of the flow reversing device 9 is led out from the middle of the first one-way valve and the second one-way valve, the second port 9-2 of the flow reversing device 9 is led out from the middle of the third one-way valve and the fourth one-way valve, the third port 9-3 of the flow reversing device 9 is led out from the middle of the second one-way valve and the fourth one-way valve, and the fourth port 9-4 of the flow reversing device 9 is led out from the middle of the first one-way valve and the third one-way valve.

[0028] like Figure 3 As shown, in a possible embodiment, two flow reversing devices 9 of the embodiment of the present invention are provided, wherein the first flow reversing device 91 is connected to the third heat exchanger 6 and the flow control device 3 through a pipeline, and the second flow reversing device 92 is connected in parallel to the third heat exchanger 6; the first port 9-1 and the second port 9-2 of the two flow reversing devices 9 serve as the lead-out interfaces of the first channel and the second channel respectively, that is, the flow reversing heat transfer device of the two flow reversing devices is provided with the first channel first interface 36b-1, the first channel second interface 36b-2, the second channel first interface 36b-3 and the second channel second interface 36b-4; the third port 9-3 and the fourth port 9-4 of the first flow reversing device 91 are respectively connected to the first branch of the third heat exchanger 6 and the flow control device 3; the third port 9-3 and the fourth port 9-4 of the second flow reversing device 92 are respectively connected to the inlet and outlet of the second branch of the third heat exchanger 6.

[0029] like Figure 4As shown, in a possible implementation manner, the flow reversing device 9 of the embodiment of the present invention is provided with a third port 9-3 and a fourth port 9-4 of the flow reversing device 9 are respectively connected to the first branch of the third heat exchanger 6 and the flow control device 3, and the first port 9-1 and the second port 9-2 of the flow reversing device 9 and the inlet and outlet of the second branch of the third heat exchanger 6 are respectively used as the lead-out interfaces of the first channel and the second channel, that is, a flow reversing heat transfer device of a flow reversing device is provided with a first channel first interface 36c-1, a first channel second interface 36c-2, a second channel first interface 36c-3 and a second channel second interface 36c-4.

[0030] In a possible implementation manner, the flow control device 3 in the embodiment of the present invention is a throttle valve or a capillary tube.

[0031] The dual-fluid refrigeration and heat pump circulation system of the present invention utilizes the second fluid to cool the first fluid in the compressor, thereby realizing near-isothermal compression and achieving the effect of saving compressor energy consumption.

[0032] The flow reversing heat transfer device of the present invention further increases the temperature of the first fluid at the suction port of the compressor, thereby improving the near-isothermal compression effect and preventing the first fluid from undergoing a phase change that causes the compressor to fail.

[0033] The flow reversing heat transfer device of the present invention adopts a flow reversing device, so that the first fluid, whether entering from the first or second port, first flows through the third heat exchanger and then flows through the flow control device, thereby preventing the first fluid from flowing back and causing system failure when the cycle switches from a cooling condition to a heating condition.

[0034] In the dual-fluid refrigeration and heat pump circulation system of the present invention, the first heat exchanger has two branches, which has the advantage of a compact structure.

[0035] The dual-fluid refrigeration and heat pump circulation system of the present invention has a reasonable solution, a simple structure, is easy to implement, and can give full play to the advantages of near-isothermal compression.

[0036] Near-isothermal compression refers to a compression method that keeps the temperature of the gas relatively stable or changes only slightly during the gas compression process through effective heat exchange and heat dissipation measures. Its basic principle is to dissipate the heat generated in time during the compression process, thereby avoiding a significant increase in the gas temperature.

[0037] Near-isothermal compression can significantly reduce energy consumption and heat loss during the compression process, thereby improving compression efficiency. Since near-isothermal compression has relatively low requirements for equipment and does not require excessive equipment and technical support, it can reduce equipment costs. In gas storage, transportation and use, near-isothermal compression can effectively improve safety and reliability and avoid safety accidents caused by excessive temperatures. Near-isothermal compression can reduce greenhouse gas emissions and meet the requirements of environmental protection and sustainable development.

[0038] In practical applications, near-isothermal compression technology has achieved remarkable results. For example, in compressed air energy storage systems, the use of near-isothermal compression technology can significantly improve energy storage efficiency and reduce energy consumption. In addition, in heat pump systems, near-isothermal compression can also achieve more efficient heat energy conversion and utilization. Near-isothermal compression uses an efficient heat dissipation system to achieve timely heat dissipation during the compression process. Through precise temperature control, it can be ensured that the temperature of the gas remains stable or has only slight fluctuations during the compression process, thereby improving compression efficiency and reducing energy consumption. Near-isothermal compression technology can be applied to various gas compression fields, such as air compression, heat pumps, liquid natural gas storage, etc., and has broad application prospects.

[0039] The above description is only a preferred embodiment of the present disclosure and an explanation of the technical principles used. Those skilled in the art should understand that the scope of disclosure involved in the present disclosure is not limited to the technical solutions formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above disclosed concept. For example, the above features are replaced with the technical features with similar functions disclosed in the present disclosure (but not limited to) by each other to form a technical solution.

[0040] Although the subject matter has been described in language specific to structural features and / or methodological logical actions, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. On the contrary, the specific features and actions described above are merely example forms of implementing the claims.

[0041] Multiple embodiments of the present disclosure are described in detail above, but the present disclosure is not limited to these specific embodiments. Those skilled in the art can make various variations and modifications to the embodiments based on the concepts of the present disclosure, and these variations and modifications should all fall within the scope of protection required by the present disclosure.

Claims

1. A dual-fluid refrigeration and heat pump circulation system, characterized in that: It comprises a compressor (1), a first heat exchanger (2), a flow reversing heat transfer device (36), a second heat exchanger (4), a four-way reversing valve (5), and an energy recovery device (7); A first fluid and a second fluid are introduced into the compressor (1). After the first fluid and the second fluid are pressurized and separated internally by the compressor (1), the output first fluid is introduced into the first channel of the four-way reversing valve (5) and then enters the first branch of the first heat exchanger (2) for cooling. The first fluid then flows through the flow reversing heat transfer device (36) to continue to release heat and cool down and throttle and reduce pressure. The first fluid then flows out from the first channel of the flow reversing heat transfer device (36) and enters the second heat exchanger (4) for absorbing heat. The first fluid then flows into the second channel of the four-way reversing valve (5) and then returns to the second channel of the flow reversing heat transfer device (36) for absorbing heat and increasing temperature. The first fluid then flows out from the second channel of the flow reversing heat transfer device (36) and enters the compressor (1). The first fluid is mixed with the second fluid at the air intake of the compressor (1) to form a circulation flow path for the first fluid. After the second fluid is separated from the first fluid inside the compressor (1), it enters the second branch of the first heat exchanger (2) through an independent pipeline for cooling, and the pressure energy of the second fluid is recovered through the energy recovery device (7). Finally, the second fluid is mixed with the first fluid at the air intake of the compressor (1) to form a second fluid circulation path.

2. The dual-fluid refrigeration and heat pump circulation system according to claim 1, characterized in that: The ratio of the second fluid mass flow rate to the sum of the first fluid and the second fluid mass flow rates is adjustable between 0 and 90%.

3. The dual-fluid refrigeration and heat pump circulation system according to claim 1, characterized in that: The energy recovery device (7) adopts a liquid expander.

4. The dual-fluid refrigeration and heat pump circulation system according to claim 3, characterized in that: The energy recovery device (7) is integrated inside the compressor (1) to form a compression-expansion integrated machine.

5. The dual-fluid refrigeration and heat pump circulation system according to claim 1, characterized in that: The first fluid is a low greenhouse effect refrigerant, including any one or more combinations of HC refrigerants, HFO refrigerants or CO2; The second fluid is lubricating oil.

6. A flow reversing heat transfer device, characterized in that: The invention comprises a flow reversing device (9), a third heat exchanger (6), and a flow control device (3) connected by pipelines, wherein the flow reversing device (9) is composed of four one-way valves (13) connected together by pipelines, and the flow reversing device (9) has four interfaces, wherein a first port (9-1) and a second port (9-2) of the flow reversing device (9) are respectively located between two groups of one-way valves (13) connected in sequence, and a third port (9-3) and a fourth port (9-4) of the flow reversing device (9) are respectively located between two one-way valves (13) arranged in the same direction and arranged in the opposite direction; a first channel and a second channel of a flow reversing heat transfer device (36) are established by the flow reversing device (9) and the third heat exchanger (6), and lead out to the interfaces.

7. The flow reversing heat transfer device according to claim 6, characterized in that: The first one-way valve and the second one-way valve of the flow reversing device (9) are connected in sequence, and the third one-way valve and the fourth one-way valve are connected in sequence. The first one-way valve and the third one-way valve are arranged in opposite directions, and the second one-way valve and the fourth one-way valve are arranged in the same direction. The first port (9-1) of the flow reversing device (9) is led out from the middle of the first one-way valve and the second one-way valve, the second port (9-2) of the flow reversing device (9) is led out from the middle of the third one-way valve and the fourth one-way valve, the third port (9-3) of the flow reversing device (9) is led out from the middle of the second one-way valve and the fourth one-way valve, and the fourth port (9-4) of the flow reversing device (9) is led out from the middle of the first one-way valve and the third one-way valve.

8. The flow reversing heat transfer device according to claim 7, characterized in that: Two flow reversing devices (9) are provided, the first flow reversing device (91) is connected to the third heat exchanger (6) and the flow control device (3) through a pipeline, and the second flow reversing device (92) is connected in parallel to the third heat exchanger (6); the first port (9-1) and the second port (9-2) of the two flow reversing devices (9) serve as outlet interfaces of the first channel and the second channel respectively; the third port (9-3) and the fourth port (9-4) of the first flow reversing device (91) are connected to the first branch of the third heat exchanger (6) and the flow control device (3) respectively; the third port (9-3) and the fourth port (9-4) of the second flow reversing device (92) are connected to the inlet and the outlet of the second branch of the third heat exchanger (6) respectively.

9. The flow reversing heat transfer device according to claim 7, characterized in that: The flow reversing device (9) is provided with a third port (9-3) and a fourth port (9-4) of the flow reversing device (9) are respectively connected to the first branch of the third heat exchanger (6) and the flow control device (3); the first port (9-1) and the second port (9-2) of the flow reversing device (9) and the inlet and outlet of the second branch of the third heat exchanger (6) respectively serve as outlet interfaces of the first channel and the second channel.

10. The flow reversing heat transfer device according to claim 6, characterized in that: The flow control device (3) is a throttle valve or a capillary tube.

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