Two-stage circulation compressor system and vehicle

Abstract

The invention belongs to the technical field of vehicles, and discloses a two-stage circulation compressor system and a vehicle, in the two-stage circulation compressor system, a first-stage compression circulation loop is formed through an air suction port, a middle exhaust port and a second cooling module, and a refrigerant is sequentially compressed, condensed, expanded and evaporated, so that an external structure is cooled; a second-stage compression circulation loop is formed through the middle air supply port, the exhaust port and the first cooling module, and the refrigerant is also sequentially compressed, condensed, expanded and evaporated, so that the refrigerant in the first-stage compression circulation loop is cooled and condensed through the heat exchange module, the pressure ratio in each stage of compression circulation can be reduced, and the compression efficiency is improved. And the compressor is in a suitable working range, so that the efficiency of the compressor is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and in particular to a two-stage circulation compressor system and a vehicle. Background Art

[0002] In new energy vehicles, a compressor system is usually used for cooling or heating, thereby cooling or heating the power battery.

[0003] Under high-load refrigeration conditions at high ambient temperatures, the evaporation pressure and evaporation temperature are usually within the normal operating range. However, due to the large refrigeration load, the compressor speed will be high, and the condensation heat dissipation of the entire system will be large. At this time, it is a very high ambient temperature condition, which further causes the system's condensation pressure and condensation temperature to be very high, even close to the critical pressure of the refrigerant, and the pressure ratio of the system's evaporation pressure and condensation pressure is too large. Under high-load heating conditions at low ambient temperatures, the condensation pressure and condensation temperature are usually within the normal operating range. However, due to the large heating load, the compressor speed will be high, and the evaporation heat absorption of the entire system will be large. At this time, it is a very low ambient temperature condition, which further causes the system's evaporation pressure and evaporation temperature to be very low, even close to negative pressure, and the pressure ratio of the system's evaporation pressure and condensation pressure is too large. It can be seen that under high-load refrigeration conditions at high ambient temperatures or high-load heating conditions at low ambient temperatures, the compressor power will be too large and the capacity will be limited. Summary of the invention

[0004] According to one aspect of the present invention, the present invention provides a two-stage circulation compressor system to solve the problem in the prior art that the compressor power is too large and the capacity is limited under high-load refrigeration conditions at high ambient temperatures or high-load heating conditions at low ambient temperatures.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] Two-stage circulation compressor system, including:

[0007] A compressor, used for compressing gaseous refrigerant, the compressor having an air intake port and an intermediate air supply port for the gaseous refrigerant to enter, and an intermediate exhaust port and an exhaust port for the gaseous refrigerant to be discharged, the air intake port is communicated with the intermediate exhaust port, and the intermediate air supply port is communicated with the exhaust port;

[0008] A first cooling module, having a first inlet end and a first outlet end, wherein the first inlet end is communicated with the exhaust port, the first cooling module is used to liquefy and expand the gaseous refrigerant, and the first outlet end is communicated with the intermediate air supply port through a heat exchange module;

[0009] a second cooling module, having a second inlet end and a second outlet end, the second inlet end being communicated with the intermediate exhaust port through the heat exchange module, the second cooling module being used to expand the refrigerant and exchange heat with the external structure, and the second outlet end being communicated with the air intake port;

[0010] The heat exchange module is used to exchange heat between the refrigerant discharged through the first outlet and the refrigerant discharged through the intermediate exhaust port.

[0011] As a preferred solution for the secondary circulation compressor system, the heat exchange module is a heat exchanger, and the heat exchanger has a first heat exchange inlet end, a first heat exchange outlet end, a second heat exchange inlet end and a second heat exchange outlet end, the first heat exchange inlet end is connected with the first outlet end, the first heat exchange outlet end is connected with the intermediate air supply port, the second heat exchange inlet end is connected with the intermediate exhaust port, and the second heat exchange outlet end is connected with the second inlet end, and the heat exchanger is used to exchange heat between the refrigerant entering through the first heat exchange inlet end and the refrigerant entering through the second heat exchange inlet end.

[0012] As a preferred solution of the secondary circulation compressor system, the heat exchange module is a gas-liquid separator, and the gas-liquid separator has a mixing inlet end, a liquid outlet end and a gas outlet end. The mixing inlet end is connected to the first outlet end and the intermediate exhaust port at the same time, the liquid outlet end is connected to the second inlet end, and the gas outlet end is connected to the intermediate air supply port. The gas-liquid separator is used to mix the refrigerant discharged through the first outlet end with the refrigerant discharged through the intermediate exhaust port, and to exchange heat, and the liquid refrigerant is discharged from the liquid outlet end, and the gaseous refrigerant is discharged from the gas outlet end.

[0013] As a preferred solution for the secondary circulation compressor system, the first cooling module includes a condenser and a first expansion valve connected to the condenser, the first inlet end is arranged at the condenser, the first outlet end is arranged at the first expansion valve, the condenser is used to liquefy the gaseous refrigerant, and the liquefied refrigerant can flow to the first expansion valve, and the first expansion valve is used to expand the liquid refrigerant.

[0014] As a preferred solution of the two-stage circulation compressor system, the condenser is connected to the first expansion valve via a first liquid storage tank, and the first liquid storage tank is used to store liquid refrigerant.

[0015] As a preferred solution of the two-stage circulation compressor system, the first expansion valve is an electromagnetic expansion valve.

[0016] As a preferred solution for the secondary circulation compressor system, the second cooling module includes a second expansion valve and a cooler connected to the second expansion valve, the second inlet end is arranged at the second expansion valve, the second outlet end is arranged at the cooler, the second expansion valve is used to expand the refrigerant, and the expanded refrigerant can flow to the cooler, and the cooler is used to exchange heat between the refrigerant and the external structure.

[0017] As a preferred solution of the two-stage circulation compressor system, the second expansion valve is connected to the heat exchange module via a second liquid storage tank, and the second liquid storage tank is used to store liquid refrigerant.

[0018] As a preferred embodiment of the secondary circulation compressor system, the compressor has a first gas flow channel and a second gas flow channel, the air intake port is connected to the first gas flow channel, the first gas flow channel is connected to the intermediate exhaust port, the intermediate air supply port is connected to the second gas flow channel, and the second gas flow channels are both connected to the exhaust port.

[0019] According to another aspect of the present invention, a vehicle is provided, comprising the above-mentioned two-stage circulation compressor system and a power battery, wherein the second cooling module is capable of exchanging heat with the power battery.

[0020] The beneficial effects of the present invention are:

[0021] The present invention provides a two-stage circulation compressor system, including a compressor, a first cooling module, a second cooling module and a heat exchange module. The compressor is used to compress gaseous refrigerant, and the compressor has an air intake port and an intermediate air supply port for the gaseous refrigerant to enter, and has an intermediate exhaust port and an exhaust port for the gaseous refrigerant to be discharged. The air intake port is connected to the intermediate exhaust port, and the intermediate air supply port is connected to the exhaust port, so that the gaseous refrigerant entering through the air intake port can be compressed by the compressor, and the compressed gaseous refrigerant is discharged from the intermediate exhaust port. In addition, the gaseous refrigerant entering through the intermediate air supply port is compressed by the compressor, and the compressed gaseous refrigerant is discharged from the exhaust port. The first cooling module has a first inlet end and a first outlet end, and the first inlet end is connected to the exhaust port. The first cooling module is used to liquefy and expand the gaseous refrigerant. During the liquefaction process, the gaseous refrigerant compressed by the compressor condenses and releases heat, and expands. The first outlet port is connected to the intermediate air supply port through a heat exchange module, and the second cooling module has a second inlet port and a second outlet port. The second inlet port is connected to the intermediate exhaust port through a heat exchange module. The heat exchange module is used to exchange heat between the refrigerant discharged through the first outlet port and the refrigerant discharged through the intermediate exhaust port, so that the refrigerant expanded by the first cooling module and the refrigerant compressed by the compressor and discharged through the intermediate exhaust port exchange heat. The refrigerant expanded by the first cooling module evaporates and absorbs heat to form a high-temperature refrigerant. The refrigerant discharged through the intermediate exhaust port condenses and releases heat to form a low-temperature refrigerant. The high-temperature refrigerant flows back to the compressor through the intermediate air supply port, and the low-temperature refrigerant flows to the second cooling module. The second cooling module is used to expand the low-temperature refrigerant and exchange heat with the external structure to cool the external structure. At the same time, the refrigerant evaporates and absorbs heat and becomes gaseous again. The second outlet port is connected to the air intake port, so that the gaseous refrigerant flows into the compressor and circulates again. In the two-stage circulation compressor system, a first-stage compression circulation loop is formed by the air intake port, the intermediate exhaust port and the second cooling module, and the refrigerant is compressed, condensed, expanded and evaporated in sequence, thereby cooling the external structure. In addition, a second-stage compression circulation loop is formed by the intermediate air supply port, the exhaust port and the first cooling module, and the refrigerant is also compressed, condensed, expanded and evaporated in sequence, thereby cooling the refrigerant in the first-stage compression circulation loop through the heat exchange module to condense it, thereby reducing the pressure ratio in each stage of the compression cycle, placing the compressor within a more suitable working range, and thus improving the efficiency of the compressor.

[0022] The present invention also provides a vehicle, including the above-mentioned two-stage circulation compressor system, and also including a power battery. The second cooling module can exchange heat with the power battery. In the two-stage circulation compressor system, a first-stage compression circulation loop is formed by an air intake port, an intermediate exhaust port and a second cooling module, and the refrigerant is compressed, condensed, expanded and evaporated in sequence, thereby cooling the power battery. In addition, a second-stage compression circulation loop is formed by an intermediate air supply port, an exhaust port and a first cooling module, and the refrigerant is also compressed, condensed, expanded and evaporated in sequence, thereby cooling the refrigerant in the first-stage compression circulation loop through the heat exchange module to condense it. In this way, the pressure ratio in each stage of the compression cycle can be reduced, so that the compressor is within a more suitable working range, thereby improving the efficiency of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a structural schematic diagram of a two-stage circulating compressor system in Embodiment 1 of the present invention;

[0024] Figure 2 is a schematic structural diagram of a compressor in Embodiment 1 of the present invention;

[0025] Figure 3 is a cross-sectional view of a compressor in Embodiment 1 of the present invention;

[0026] Figure 4 is a structural schematic diagram of a two-stage circulating compressor system in Embodiment 2 of the present invention;

[0027] Figure 5 is a structural schematic diagram of a two-stage circulating compressor system in Embodiment 3 of the present invention;

[0028] Figure 6 It is a structural schematic diagram of the two-stage circulation compressor system in the fourth embodiment of the present invention.

[0029] In the figure:

[0030] 1. compressor; 101. air inlet; 102. intermediate air outlet; 1021. intermediate air outlet communicating flow channel; 103. intermediate air supply port; 1031. intermediate air supply port communicating flow channel; 104. air outlet; 1041. air outlet communicating flow channel; 105. first gas flow channel; 106. second gas flow channel;

[0031] 2. First cooling module; 21. Condenser; 22. First expansion valve; 23. First liquid storage tank;

[0032] 3. Second cooling module; 31. Second expansion valve; 32. Cooler; 33. Second liquid storage tank;

[0033] 4. Heat exchanger; 401. first heat exchange inlet; 402. first heat exchange outlet; 403. second heat exchange inlet; 404. second heat exchange outlet;

[0034] 5. Gas-liquid separator; 501. Mixing inlet; 502. Liquid outlet; 503. Gas outlet. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0036] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0038] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0039] Embodiment 1

[0040] In new energy vehicles, compressor systems are usually used for cooling or heating, thereby cooling or heating the power battery. However, in high-load cooling conditions at high ambient temperatures or high-load heating conditions at low ambient temperatures, the compressor power will be too large and the capacity will be limited.

[0041] In response to the above problems, this embodiment provides a two-stage circulation compressor system to solve the problem of excessive compressor power and limited capacity under high-load refrigeration conditions at high ambient temperatures or high-load heating conditions at low ambient temperatures in the prior art, and can be used in the field of vehicle technology.

[0042] Reference Figure 1The two-stage circulation compressor system includes a compressor 1, a first cooling module 2, a second cooling module 3 and a heat exchange module. The compressor 1 is used to compress the gaseous refrigerant. The compressor 1 has an air intake port 101 and an intermediate air supply port 103 for the gaseous refrigerant to enter, and has an intermediate exhaust port 102 and an exhaust port 104 for the gaseous refrigerant to be discharged. The air intake port 101 is connected to the intermediate exhaust port 102, and the intermediate air supply port 103 is connected to the exhaust port 104, so that the gaseous refrigerant entering through the air intake port 101 can be compressed by the compressor 1, and the compressed gaseous refrigerant is discharged from the intermediate exhaust port 102. In addition, the gaseous refrigerant entering through the intermediate air supply port 103 is compressed by the compressor 1, and the compressed gaseous refrigerant is discharged from the exhaust port 104. The first cooling module 2 has a first inlet end and a first outlet end, and the first inlet end is connected to the exhaust port 104. The first cooling module 2 is used to liquefy and expand the gaseous refrigerant. During the liquefaction process, the gaseous refrigerant compressed by the compressor 1 condenses and releases heat, and expands. The first outlet end is connected with the intermediate air supply port 103 through a heat exchange module, and the second cooling module 3 has a second inlet end and a second outlet end. The second inlet end is connected with the intermediate exhaust port 102 through a heat exchange module. The heat exchange module is used to make the refrigerant discharged through the first outlet end exchange heat with the refrigerant discharged through the intermediate exhaust port 102, so that the refrigerant expanded by the first cooling module 2 and the refrigerant compressed by the compressor 1 and discharged through the intermediate exhaust port 102 exchange heat. The refrigerant expanded by the first cooling module 2 evaporates and absorbs heat to form a high-temperature refrigerant. The refrigerant discharged through the intermediate exhaust port 102 condenses and releases heat to form a low-temperature refrigerant. The high-temperature refrigerant flows back to the compressor 1 through the intermediate air supply port 103, and the low-temperature refrigerant flows to the second cooling module 3. The second cooling module 3 is used to expand the low-temperature refrigerant and exchange heat with the external structure to cool the external structure. At the same time, the refrigerant evaporates and absorbs heat and becomes gaseous again. The second outlet end is connected with the air intake port 101, so that the gaseous refrigerant flows into the compressor 1 and circulates again. In the two-stage circulation compressor system, a first-stage compression circulation loop is formed by the air intake port 101, the intermediate exhaust port 102 and the second cooling module 3, and the refrigerant is compressed, condensed, expanded and evaporated in sequence, thereby cooling the external structure. In addition, a second-stage compression circulation loop is formed by the intermediate air supply port 103, the exhaust port 104 and the first cooling module 2, and the refrigerant is also compressed, condensed, expanded and evaporated in sequence, thereby cooling the refrigerant in the first-stage compression circulation loop through the heat exchange module to condense it, thereby reducing the pressure ratio in each stage of the compression cycle, so that the compressor 1 is in a more suitable working range, thereby improving the efficiency of the compressor 1.Specifically, with such an arrangement, the pressure ratio of each stage of the compression cycle can be reduced exponentially. For example, the pressure ratio of the high-load refrigeration condition under high ambient temperature is 25. In this two-stage circulation compressor system, the pressure ratio of compressor 1 can be reduced to 5 in both the first-stage compression cycle loop and the second-stage compression cycle loop.

[0043] Continue to refer to Figure 1 In this embodiment, the heat exchange module is a heat exchanger 4, which has a first heat exchange inlet port 401, a first heat exchange outlet port 402, a second heat exchange inlet port 403 and a second heat exchange outlet port 404. The first heat exchange inlet port 401 is connected to the first outlet port, the first heat exchange outlet port 402 is connected to the intermediate air supply port 103, the second heat exchange inlet port 403 is connected to the intermediate exhaust port 102, and the second heat exchange outlet port 404 is connected to the second inlet port. The heat exchanger 4 is used to allow the refrigerant entering through the first heat exchange inlet port 401 to exchange heat with the refrigerant entering through the second heat exchange inlet port 403, so that the refrigerant in the first-stage compression cycle loop and the refrigerant in the second-stage compression cycle loop are heat-exchanged, and the refrigerant in the first-stage compression cycle loop is cooled and further condensed to cool the external structure, while the refrigerant in the second-stage compression cycle loop is evaporated by heat, and then enters the compressor 1 by flowing to the intermediate air supply port 103 and is compressed again.

[0044] Continue to refer to Figure 1 The first cooling module 2 specifically includes a condenser 21 and a first expansion valve 22 connected to the condenser 21. The first inlet end is arranged at the condenser 21. The input end of the condenser 21 is communicated with the exhaust port 104. The first outlet end is arranged at the first expansion valve 22. The output end of the first expansion valve 22 is communicated with the intermediate air supply port 103 through the heat exchange module. The condenser 21 is used to liquefy the gaseous refrigerant, and the liquefied refrigerant can flow to the first expansion valve 22. The first expansion valve 22 is used to expand the liquid refrigerant. Optionally, the first expansion valve 22 is an electromagnetic expansion valve, so as to realize automatic control of the first expansion valve 22.

[0045] Continue to refer to Figure 1 The second cooling module 3 specifically includes a second expansion valve 31 and a cooler 32 connected to the second expansion valve 31. The second inlet end is arranged at the second expansion valve 31. The input end of the second expansion valve 31 is connected to the intermediate exhaust port 102 through the heat exchange module. The second outlet end is arranged at the cooler 32. The output end of the cooler 32 is connected to the air intake port 101. The second expansion valve 31 is used to expand the refrigerant, and the expanded refrigerant can flow to the cooler 32. The cooler 32 is used to exchange heat between the refrigerant and the external structure. Optionally, the second expansion valve 31 is an electromagnetic expansion valve to facilitate automatic control of the second expansion valve 31.

[0046] Reference Figure 1-Figure 3 The compressor 1 has a first gas flow channel 105 and a second gas flow channel 106. The air intake port 101 is connected to the first gas flow channel 105, and the first gas flow channel 105 is connected to the intermediate exhaust port 102, so that the air intake port 101 and the intermediate exhaust port 102 are connected through the first gas flow channel 105, wherein the intermediate exhaust port 102 is specifically connected to the first gas flow channel 105 through the intermediate exhaust port connecting flow channel 1021. The intermediate gas replenishment port 103 is connected to the second gas flow channel 106, and the second gas flow channel 106 is connected to the exhaust port 104, so that the intermediate gas replenishment port 103 and the exhaust port 104 are connected through the second gas flow channel 106, wherein the intermediate gas replenishment port 103 is specifically connected to the second gas flow channel 106 through the intermediate gas replenishment port connecting flow channel 1031, and the exhaust port 104 is specifically connected to the second gas flow channel 106 through the exhaust port connecting flow channel 1041. Optionally, the first gas flow channel 105 and the second gas flow channel 106 are both spiral-shaped, and the compressor 1 can compress the gaseous refrigerant inside the first gas flow channel 105 and the second gas flow channel 106 .

[0047] The following combination Figure 1-Figure 3 The working process of the two-stage circulation compressor system in this embodiment is introduced.

[0048] In this embodiment, a first-stage compression cycle loop is formed by the air intake port 101 , the intermediate air exhaust port 102 and the second cooling module 3 , and a second-stage compression cycle loop is formed by the intermediate air supply port 103 , the air exhaust port 104 and the first cooling module 2 .

[0049] In the first-stage compression cycle, the gaseous refrigerant can be compressed by the compressor 1, and the compressed gaseous refrigerant is discharged from the middle exhaust port 102. After being cooled by the heat exchanger 4, it is liquefied into liquid refrigerant. The liquid refrigerant flows into the second expansion valve 31 for expansion, and then flows to the cooler 32 to exchange heat with the external structure to cool the external structure. Then the gaseous refrigerant flows back into the compressor 1 through the intake port 101.

[0050] In the second-stage compression cycle loop, the gaseous refrigerant entering through the intermediate air supply port 103 is compressed by the compressor 1, and the compressed gaseous refrigerant is discharged from the exhaust port 104. After passing through the condenser 21, it is liquefied into liquid refrigerant. The liquid refrigerant flows into the first expansion valve 22 for expansion, and then flows to the heat exchanger 4, and exchanges heat with the gaseous refrigerant in the first-stage compression cycle loop. At the same time, the liquid refrigerant in the second-stage compression cycle loop evaporates into a gaseous state and flows into the compressor 1 again through the intermediate air supply port 103.

[0051] Embodiment 2

[0052] This embodiment provides another two-stage circulation compressor system, which is based on the two-stage circulation compressor system in the first embodiment and is further provided with a first liquid storage tank 23 and a second liquid storage tank 33 .

[0053] Reference Figure 4 The condenser 21 is connected to the first expansion valve 22 through the first liquid storage tank 23. The first liquid storage tank 23 is used to store liquid refrigerant, so that the condensed liquid refrigerant can be temporarily stored in the first liquid storage tank 23. When heat exchange is required, the liquid refrigerant flows out of the first liquid storage tank 23 and enters the first expansion valve 22 for expansion.

[0054] Continue to refer to Figure 4 The second expansion valve 31 is connected to the heat exchange module through the second liquid storage tank 33. The second liquid storage tank 33 is used to store liquid refrigerant, so that the condensed liquid refrigerant can be temporarily stored in the second liquid storage tank 33. When the external structure needs to be cooled, the liquid refrigerant flows out of the second liquid storage tank 33 and enters the second expansion valve 31 for expansion.

[0055] Embodiment 3

[0056] This embodiment provides another two-stage circulation compressor system, which is different from the two-stage circulation compressor system in the first embodiment in that the specific structure of the heat exchange module is different.

[0057] Reference Figure 5 In this embodiment, the heat exchange module is a gas-liquid separator 5, which has a mixing inlet port 501, a liquid outlet port 502 and a gas outlet port 503. The mixing inlet port 501 is connected to the first outlet port and the intermediate exhaust port 102 at the same time, the liquid outlet port 502 is connected to the second inlet port, and the gas outlet port 503 is connected to the intermediate air supply port 103. The gas-liquid separator 5 is used to mix the refrigerant discharged through the first outlet port with the refrigerant discharged through the intermediate exhaust port 102, and to exchange heat, and the liquid refrigerant is discharged from the liquid outlet port 502, and the gaseous refrigerant is discharged from the gas outlet port 503. By setting up a gas-liquid separator 5, the refrigerant discharged through the first outlet port is mixed with the refrigerant discharged through the intermediate exhaust port 102 to perform sufficient heat exchange. In this process, the two parts of the refrigerant are mixed, one part of the refrigerant is condensed into liquid, and the other part of the refrigerant is evaporated into gas. The liquid refrigerant is discharged from the liquid outlet port 502 and further flows to the second cooling module 3. The gaseous refrigerant is discharged from the gas outlet port 503 and further flows back to the compressor through the intermediate air supply port 103.

[0058] The following combination Figure 5 The working process of the two-stage circulation compressor system in this embodiment is introduced.

[0059] In this embodiment, it can also be divided into a two-stage compression cycle loop, that is, the first-stage compression cycle loop is formed by the air intake port 101, the intermediate exhaust port 102 and the second cooling module 3, and the second-stage compression cycle loop is formed by the intermediate air supply port 103, the exhaust port 104 and the first cooling module 2. However, it should be noted that the two-stage compression cycle loop will have an intersection in the gas-liquid separator 5.

[0060] In the first-stage compression cycle, the gaseous refrigerant can be compressed by the compressor 1 for entering the gaseous refrigerant through the air intake port 101, and the compressed gaseous refrigerant is discharged from the intermediate exhaust port 102 and flows into the gas-liquid separator 5. In the gas-liquid separator 5, the refrigerant discharged from the first outlet is mixed with the refrigerant discharged from the intermediate exhaust port 102 to fully exchange heat. Subsequently, the condensed liquid refrigerant flows into the second expansion valve 31 for expansion, and then flows to the cooler 32 to exchange heat with the external structure to cool the external structure, and then the gaseous refrigerant flows back into the compressor 1 through the air intake port 101.

[0061] In the second-stage compression cycle, the gaseous refrigerant entering through the intermediate air supply port 103 is compressed by the compressor 1, and the compressed gaseous refrigerant is discharged from the exhaust port 104. After passing through the condenser 21, it is liquefied into liquid refrigerant. The liquid refrigerant flows into the first expansion valve 22 for expansion, and then flows into the gas-liquid separator 5. In the gas-liquid separator 5, the refrigerant discharged from the first outlet is mixed with the refrigerant discharged through the intermediate exhaust port 102 to perform sufficient heat exchange. Subsequently, the evaporated gaseous refrigerant flows back to the compressor 1 through the intermediate air supply port 103 again.

[0062] Embodiment 4

[0063] This embodiment provides another two-stage circulation compressor system, which is based on the two-stage circulation compressor system in the third embodiment and further includes a first liquid storage tank 23 and a second liquid storage tank 33 .

[0064] Reference Figure 6 The condenser 21 is connected to the first expansion valve 22 through the first liquid storage tank 23. The first liquid storage tank 23 is used to store liquid refrigerant, so that the condensed liquid refrigerant can be temporarily stored in the first liquid storage tank 23. When heat exchange is required, the liquid refrigerant flows out of the first liquid storage tank 23 and enters the first expansion valve 22 for expansion.

[0065] Continue to refer to Figure 6 The second expansion valve 31 is connected to the heat exchange module through the second liquid storage tank 33. The second liquid storage tank 33 is used to store liquid refrigerant, so that the condensed liquid refrigerant can be temporarily stored in the second liquid storage tank 33. When the external structure needs to be cooled, the liquid refrigerant flows out of the second liquid storage tank 33 and enters the second expansion valve 31 for expansion.

[0066] Embodiment 5

[0067] The present embodiment provides a vehicle, comprising the two-stage circulation compressor system in any of the above-mentioned embodiments, the vehicle also comprising a power battery, the second cooling module 3 being capable of heat exchange with the power battery, in the two-stage circulation compressor system, a first-stage compression circulation loop is formed by an air intake port 101, an intermediate exhaust port 102 and the second cooling module 3, the refrigerant is compressed, condensed, expanded and evaporated in sequence, thereby cooling down the power battery, in addition, a second-stage compression circulation loop is formed by an intermediate air supply port 103, an exhaust port 104 and the first cooling module 2, the refrigerant is also compressed, condensed, expanded and evaporated in sequence, thereby cooling down the refrigerant in the first-stage compression circulation loop through the heat exchange module to condense it, thereby reducing the pressure ratio in each stage of the compression cycle, placing the compressor 1 within a more suitable working range, thereby improving the efficiency of the compressor 1.

[0068] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. Two-stage circulating compressor system, characterized in that: include: A compressor (1) for compressing a gaseous refrigerant, the compressor (1) having an air intake port (101) and an intermediate air supply port (103) for the gaseous refrigerant to enter, and an intermediate exhaust port (102) and an exhaust port (104) for the gaseous refrigerant to be discharged, the air intake port (101) being in communication with the intermediate exhaust port (102), and the intermediate air supply port (103) being in communication with the exhaust port (104); A first cooling module (2) having a first inlet end and a first outlet end, wherein the first inlet end is in communication with the exhaust port (104), the first cooling module (2) is used to liquefy and expand the gaseous refrigerant, and the first outlet end is in communication with the intermediate air supply port (103) via a heat exchange module; A second cooling module (3) having a second inlet end and a second outlet end, the second inlet end being in communication with the intermediate exhaust port (102) via the heat exchange module, the second cooling module (3) being used to expand the refrigerant and perform heat exchange with an external structure, the second outlet end being in communication with the air intake port (101); The heat exchange module is used to allow the refrigerant discharged through the first outlet to exchange heat with the refrigerant discharged through the intermediate exhaust port (102).

2. The two-stage circulating compressor system according to claim 1, characterized in that: The heat exchange module is a heat exchanger (4), and the heat exchanger (4) has a first heat exchange inlet end (401), a first heat exchange outlet end (402), a second heat exchange inlet end (403) and a second heat exchange outlet end (404); the first heat exchange inlet end (401) is connected to the first outlet end, the first heat exchange outlet end (402) is connected to the intermediate air supply port (103), the second heat exchange inlet end (403) is connected to the intermediate air exhaust port (102), and the second heat exchange outlet end (404) is connected to the second inlet end; the heat exchanger (4) is used to perform heat exchange between the refrigerant entering through the first heat exchange inlet end (401) and the refrigerant entering through the second heat exchange inlet end (403).

3. The two-stage circulating compressor system according to claim 1, characterized in that: The heat exchange module is a gas-liquid separator (5), and the gas-liquid separator (5) has a mixing inlet end (501), a liquid outlet end (502) and a gas outlet end (503). The mixing inlet end (501) is connected to the first outlet end and the intermediate exhaust port (102) at the same time, the liquid outlet end (502) is connected to the second inlet end, and the gas outlet end (503) is connected to the intermediate gas replenishment port (103). The gas-liquid separator (5) is used to mix the refrigerant discharged through the first outlet end with the refrigerant discharged through the intermediate exhaust port (102) and perform heat exchange, and the liquid refrigerant is discharged from the liquid outlet end (502) and the gaseous refrigerant is discharged from the gas outlet end (503).

4. The two-stage circulating compressor system according to any one of claims 1 to 3, characterized in that: The first cooling module (2) comprises a condenser (21) and a first expansion valve (22) connected to the condenser (21), the first inlet end is arranged at the condenser (21), the first outlet end is arranged at the first expansion valve (22), the condenser (21) is used to liquefy gaseous refrigerant, and the liquefied refrigerant can flow to the first expansion valve (22), and the first expansion valve (22) is used to expand the liquid refrigerant.

5. The two-stage circulating compressor system according to claim 4, characterized in that: The condenser (21) is connected to the first expansion valve (22) via a first liquid storage tank (23), and the first liquid storage tank (23) is used to store liquid refrigerant.

6. The two-stage circulating compressor system according to claim 4, characterized in that: The first expansion valve (22) is an electromagnetic expansion valve.

7. The two-stage circulating compressor system according to any one of claims 1 to 3, characterized in that: The second cooling module (3) comprises a second expansion valve (31) and a cooler (32) connected to the second expansion valve (31), the second inlet end is arranged at the second expansion valve (31), the second outlet end is arranged at the cooler (32), the second expansion valve (31) is used to expand the refrigerant, and the expanded refrigerant can flow to the cooler (32), and the cooler (32) is used to enable the refrigerant to exchange heat with an external structure.

8. The two-stage circulating compressor system according to claim 7, characterized in that: The second expansion valve (31) is connected to the heat exchange module via a second liquid storage tank (33), and the second liquid storage tank (33) is used to store liquid refrigerant.

9. The two-stage circulating compressor system according to any one of claims 1 to 3, characterized in that: The compressor (1) comprises a first gas flow channel (105) and a second gas flow channel (106); the air intake port (101) is connected to the first gas flow channel (105); the first gas flow channel (105) is connected to the intermediate exhaust port (102); the intermediate air supply port (103) is connected to the second gas flow channel (106); and the second gas flow channel (106) is connected to the exhaust port (104).

10. A vehicle, characterized in that It comprises the two-stage circulation compressor system as described in any one of claims 1 to 9, and also comprises a power battery, and the second cooling module (3) is capable of heat exchange with the power battery.

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