Small-size triangular circulation heat pump integrated system

Abstract

The invention relates to a small-size triangular circulation heat pump integrated system which comprises a first refrigerant loop, a second refrigerant loop, a compressor in a heat pump module and a valve terminal. The first check valve, the second check valve, the backflow expansion valve and the gas-liquid separation tank are mounted on the valve terminal; the valve terminal comprises a flow channel mechanism, and all the elements are connected with the flow channel mechanism. The flow channel mechanism comprises a backflow loop; the valve terminal is provided with an outer connector, the first outer connector is connected with the first check valve through the valve terminal, the second outer connector is connected with the second check valve through the valve terminal, the fourth outer connector is connected with a separation inlet of the gas-liquid separation tank through the valve terminal, the first outer connector and the second outer connector are arranged in a coplanar mode, and the fourth outer connector and the sixth outer connector are arranged in an independent face mode. According to the heat pump integrated module, the heating performance of the compressor can be improved through the arrangement of the backflow loop, and the scheme that most functional elements are externally arranged is adopted, so that the whole heat pump integrated module is small in size and easy to arrange.

Description

Technical Field

[0001] This invention relates to a vehicle thermal management system, and more particularly to a small-volume triangular cycle heat pump integrated system. Background Technology

[0002] The description in this section provides only background information related to the disclosure of this invention and does not constitute prior art.

[0003] In pure electric and hybrid vehicles, the vehicle heat pump system uses a compressor to compress the refrigerant to transfer heat, and then uses the coolant circuit to exchange heat before cooling or heating the corresponding heat exchange unit.

[0004] In extremely cold vehicle operating environments, due to the low air temperature, the refrigerant returning from the compressor intake is also at a low temperature. Therefore, after being pressurized by the compressor, the refrigerant discharged from the compressor exhaust port may not reach the preset temperature threshold, significantly impacting the vehicle's heating function. It is worth noting that existing heat pump integrated modules, due to their functional requirements, require the installation of numerous expansion valves, heat exchangers, and other functional components. This not only demands high-precision installation techniques but also results in a large footprint, limiting the layout flexibility of the heat pump integrated module.

[0005] The integration is poor, and components such as waste heat recovery heat exchangers need to be connected externally to the integrated module, resulting in poor functionality.

[0006] It should be noted that the above description of the technical background is only for the purpose of providing a clear and complete explanation of the technical solutions of the present invention and facilitating understanding by those skilled in the art. It should not be assumed that the above technical solutions are known to those skilled in the art simply because they have been described in the background section of this invention. Summary of the Invention

[0007] The purpose of this invention is to provide a small-volume triangular cycle heat pump integrated system, which can improve the heating performance of the compressor by setting up a return loop, and by adopting a scheme of externalizing most functional components, the overall heat pump integrated module is small in size and easy to lay out.

[0008] The fifth and sixth external interfaces located on the valve island allow for flexible connection to components such as waste heat recovery heat exchangers, making installation easy.

[0009] To achieve the above objectives, the present invention discloses a small-volume triangular circulation heat pump integrated system, the small-volume triangular circulation heat pump integrated system comprising: First refrigerant circuit; Second refrigerant circuit; The heat pump module includes: a compressor, a valve island mounted on the compressor, and... A first check valve, a second check valve, a reflux expansion valve, and a gas-liquid separator are installed on the valve island. The valve island includes an internally through-flow channel mechanism for the flow of refrigerant. The first check valve, the second check valve, the reflux expansion valve, the gas-liquid separator, and the refrigerant passage are respectively connected to the flow channel mechanism. The flow channel mechanism includes a reflux circuit for connecting the compressor's exhaust port to the reflux expansion valve. The valve island further includes a first external interface, a second external interface, a fourth external interface, and a sixth external interface. The first external interface is connected to the first check valve through the valve island. The second external interface is connected to the second check valve through the valve island. The fourth external interface is connected to the separation inlet of the gas-liquid separator through the valve island. The sixth external interface is connected to the flow channel mechanism through the valve island and is used to connect to the outlet of at least one functional element with heat exchange function outside the valve island. The first external interface and the second external interface are disposed on the same surface of the valve island, and the fourth external interface and the sixth external interface are respectively disposed on independent surfaces of the valve island; The first external interface and the sixth external interface are connected in series via a first refrigerant circuit outside the valve island, consisting of a first condenser heat exchange unit, a first expansion valve, and at least one functional element with heat exchange function; the refrigerant can flow sequentially through the first external interface, the first condenser heat exchange unit, the first expansion valve, and at least one of the functional elements with heat exchange function before returning to the sixth external interface. The second external interface and the fourth external interface are connected in series via a second refrigerant circuit outside the valve island, consisting of a second condenser heat exchange unit, a second expansion valve, and an evaporator heat exchange unit. The refrigerant can flow sequentially through the second external interface, the second condenser heat exchange unit, the second expansion valve, and the evaporator heat exchange unit before returning to the fourth external interface.

[0010] As a further description of the above technical solution, the sixth external interface is oriented toward the first direction, and the first external interface and the second external interface are oriented toward the second direction away from the first direction.

[0011] As a further description of the above technical solution, the fourth external interface is oriented in a direction perpendicular to the first direction and the second direction.

[0012] As a further description of the above technical solution, the compressor has a preset center of mass, and the center of mass of the valve island, the first check valve, the second check valve, the reflux expansion valve, and the gas-liquid separator is adjacent to or located on the vertical plane of the preset center of mass.

[0013] As a further description of the above technical solution, the flow channel mechanism includes a first channel, a second channel, a third channel, a fourth channel, and a sixth channel. The exhaust port of the compressor is connected to the first check valve through the first channel, the exhaust port of the compressor is connected to the second check valve through the second channel, the exhaust port of the compressor is connected to the reflux expansion valve through the third channel, the reflux expansion valve is connected to the separation inlet of the gas-liquid separator through the fourth channel, and the sixth external interface is connected to the separation inlet of the gas-liquid separator through the sixth channel.

[0014] As a further description of the above technical solution, the first external interface and the third external interface are connected in series in the first refrigerant circuit outside the valve island, with a first condenser heat exchange unit, a first expansion valve, and at least one functional element with heat exchange function.

[0015] As a further description of the above technical solution, the functional component with heat exchange function includes a battery heat exchange unit, a third expansion valve, and a waste heat recovery heat exchanger arranged in sequence.

[0016] As a further description of the above technical solution, the waste heat recovery heat exchanger includes a refrigerant passage and a water cooling passage that are thermally coupled to each other. The two ends of the refrigerant passage are respectively connected to a refrigerant heat exchange inlet and a refrigerant heat exchange outlet. The refrigerant heat exchange inlet is connected to the fifth external interface, and the refrigerant heat exchange outlet is connected to the third expansion valve.

[0017] As a further description of the above technical solution, the second external interface and the fourth external interface are connected in series in the second refrigerant circuit outside the valve island, with the second condenser heat exchange unit, the second expansion valve, and the evaporator heat exchange unit connected in series.

[0018] By employing the above technical solutions, the beneficial effects of the present invention are as follows: The small-volume triangular cycle heat pump integrated system of this invention can improve the heating performance of the compressor by setting up a reflux loop. Furthermore, by adopting a scheme that externalizes most functional components, the overall heat pump integrated module is small in size and easy to lay out. Specifically, by introducing a reflux loop, this invention increases the compressor's exhaust temperature at low temperatures. After heating the refrigerant, the refrigerant returns directly to the compressor via the reflux loop. Through multiple cycles, the compressor's outlet temperature reaches the specified temperature, thereby increasing the compressor's heating speed at low temperatures and making it more suitable for extreme low-temperature environments. Moreover, the valve island of this invention integrates multiple dispersed external interfaces arranged in different directions, facilitating combination and installation with external functional components. The fewer the number of external interfaces, the smaller the overall size can be achieved.

[0019] To further understand the features and technical content of the present invention, please refer to the following detailed description and drawings of the present invention. However, the drawings provided are for reference and illustration only and are not intended to limit the present invention. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments or prior art of this specification, the drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this specification. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1-2 This is a three-dimensional schematic diagram of a small-volume triangular cycle heat pump integrated system provided in the embodiments of this specification; Figure 3-4 This is an exploded schematic diagram of a small-volume triangular cycle heat pump integrated system provided in the embodiments of this specification; Figure 5-9 This is a schematic diagram of the valve island of a small-volume triangular cycle heat pump integrated system provided in the embodiments of this specification; Figure 10-11 This is a system schematic diagram of a small-volume triangular cycle heat pump integrated system provided in the embodiments of this specification; Figure 12 This is a schematic diagram of a waste heat recovery heat exchanger for a small-volume triangular circulation heat pump integrated system provided in the embodiments of this specification; Figure 13 This is a schematic diagram of the third expansion valve of a small-volume triangular cycle heat pump integrated system provided in the embodiments of this specification; In the picture: 1. Compressor; 1A. Discharge port; 1B. Inlet port; 11. Gas-liquid separator; 11A. Separation inlet; 11B. Separation outlet; 12. Low-pressure side filling port; 2. First refrigerant circuit; 21. First check valve; 22. First condenser heat exchange unit; 23. First expansion valve; 24. Battery heat exchange unit; 25. Third expansion valve; 26. Waste heat recovery heat exchanger; 26A. Water-cooled heat exchange inlet; 26B. Water-cooled heat exchange outlet; 26C. Refrigerant heat exchange inlet; 26D. Refrigerant heat exchange outlet; 27. First check valve; 28. Warm air core; 3. Second refrigerant circuit; 31. Second check valve; 32. Second condenser heat exchange unit; 33. Radiator; 34. Second expansion valve; 35. Evaporator heat exchange unit; 4. Return circuit; 41. Return expansion valve; 5. First three-way water valve; 51. First valve port of the first three-way water valve; 52. Second valve port of the first three-way water valve; 53. Third valve port of the first three-way water valve; 6. Second three-way water valve; 61. First valve port of the second three-way water valve; 62. Second valve port of the second three-way water valve; 63. Third valve port of the second three-way water valve; 7. Battery heat exchange auxiliary circuit; 71. Second one-way valve; 8. Drive motor heat exchange unit; 9. Valve island; 91. First external interface; 92. Second external interface; 93. Third external interface; 94. Fourth external interface; 95. First channel; 96. Second channel; 97. Third channel; 98. Fourth channel; 99. Fifth channel; 910. Sixth channel; 911. Fifth external interface; 912. Sixth external interface. Detailed Implementation

[0022] To enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this specification, and not all embodiments. Based on the embodiments in this specification, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this specification.

[0023] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can understand the advantages and effects of the present invention from the content disclosed in this specification. The present invention can be implemented or applied through other different specific embodiments, and various details in this specification can also be modified and changed based on different viewpoints and applications without departing from the concept of the present invention. Furthermore, the accompanying drawings of the present invention are for simple illustrative purposes only and are not depictions of actual dimensions; this is stated in advance. The following embodiments will further describe the relevant technical content of the present invention in detail, but the disclosed content is not intended to limit the scope of protection of the present invention.

[0024] It should be understood that while terms such as "first," "second," and "third" may be used in this document to describe various components or signals, these components or signals should not be limited by these terms. These terms are primarily used to distinguish one component from another, or one signal from another. Furthermore, the term "or" as used herein should, as appropriate, include any combination of one or more of the related listed items.

[0025] Please see Figure 1 This embodiment describes a small-volume triangular cycle heat pump integrated system, which includes: First refrigerant circuit; Second refrigerant circuit; A heat pump module, the heat pump module comprising: a compressor 1, and a valve island 9 mounted on the compressor 1; The first check valve 21, the second check valve 31, the reflux expansion valve 41, and the gas-liquid separator 11 are installed on the valve island 9; Among them, the valve island 9 includes an internal flow channel mechanism for the flow of refrigerant, and the first check valve 21, the second check valve 31, the return expansion valve 41, the gas-liquid separator 11, and the refrigerant passage are respectively connected to the flow channel mechanism; the flow channel mechanism includes a return circuit 4 for connecting the exhaust port 1A of the compressor 1 to the return expansion valve 41. The valve island 9 also includes a first external interface 91, a second external interface 92, a fourth external interface 94, and a sixth external interface 912. The first external interface 91 is connected to the first check valve 21 through the valve island 9, the second external interface 92 is connected to the second check valve 31 through the valve island 9, the fourth external interface 94 is connected to the separation inlet 11A of the gas-liquid separator 11 through the valve island 9, and the sixth external interface 912 is connected to the flow channel mechanism through the valve island 9 and is used to connect to the outlet of at least one functional element with heat exchange function outside the valve island 9. The first external interface 91 and the second external interface 92 are located on the same surface of the valve island 9, while the fourth external interface 94 and the sixth external interface 912 are located on separate surfaces of the valve island 9. Among them, the first external interface 91 and the sixth external interface 912 are connected in series outside the valve island 9 via the first refrigerant circuit 2, including the first condenser heat exchange unit 22, the first expansion valve 23, and at least one functional component with heat exchange function. Between the second external interface 92 and the fourth external interface 94, a second condenser heat exchange unit 32, a second expansion valve 34, and an evaporator heat exchange unit 35 are connected in series via a second refrigerant circuit 3 outside the valve island 9.

[0026] With the above-described structure of the present invention, the heating performance of the compressor 1 can be improved by setting up the return loop 4. Furthermore, by adopting a scheme that externalizes most functional components, the overall heat pump integrated module is small in size and easy to lay out. Specifically, the introduction of the return loop 4 in this invention increases the exhaust temperature of the compressor 1 at low temperatures. After heating the refrigerant, the compressor 1 directly returns to the compressor 1 via the return loop 4. Through multiple cycles, the exhaust temperature of the compressor 1 reaches the specified temperature, thereby increasing the heating speed of the compressor 1 at low temperatures and making it more suitable for extreme low-temperature environments. Moreover, the valve island 9 of this invention integrates multiple dispersed external interfaces arranged in different directions, facilitating combination and installation with external functional components. The fewer the number of external interfaces, the smaller the overall size can be achieved.

[0027] Please see Figure 5-9 This is a schematic diagram of the flow channel mechanism connection of the valve island 9 provided in this embodiment. The flow channel mechanism includes a first channel 95, a second channel 96, a third channel 97, a fourth channel 98, and a sixth channel 910. The exhaust port 1A of the compressor 1 is connected to the first check valve 21 through the first channel 95. The exhaust port 1A of the compressor 1 is connected to the second check valve 31 through the second channel 96. The exhaust port 1A of the compressor 1 is connected to the return expansion valve 41 through the third channel 97. The return expansion valve 41 is connected to the separation inlet 11A of the gas-liquid separator 11 through the fourth channel 98. The separation outlet 11B of the gas-liquid separator 11 is directly connected to the suction port 1B of the compressor 1. The sixth external interface 912 is connected to the separation inlet 11A of the gas-liquid separator 11 through the sixth channel 910. Specifically, as shown... Figure 6 As shown, the first channel 95, the second channel 96, and the third channel 97 actually share the same physical channel, but their lengths are different. The first channel 95 extends downstream through the installed second check valve 31, and the third channel 97 extends downstream through the installed first check valve 21 and the second check valve 31.

[0028] In one embodiment, the compressor 1 has a preset center of mass, and the center of mass of the valve island 9, the first check valve 21, the second check valve 31, the reflux expansion valve 41, and the gas-liquid separator 11 is adjacent to or located on the vertical plane of the preset center of mass. By adjusting the center of mass as described above, vibrations and abnormal noises caused by the displacement of the center of mass during the operation of the compressor 1 can be reduced when the compressor 1 directly bears the force of all components.

[0029] In this invention, considering the convenience of the interface arrangement on the valve island 9 to facilitate the installation of pipelines in the external thermal management system, the sixth external interface 912 is oriented towards the first direction, while the first external interface 91 and the second external interface 92 are oriented towards the second direction away from the first direction. The fourth external interface 94 is oriented towards a direction perpendicular to both the first and second directions. From a functional perspective, in one embodiment, the first external interface 91 and the sixth external interface 912 are connected in series outside the valve island 9 via a first refrigerant circuit 2, consisting of a first condenser heat exchange unit 22, a first expansion valve 23, and at least one functional element with heat exchange function. The functional element with heat exchange function includes a battery heat exchange unit 24 arranged in sequence, and other components such as... Figure 13 The third expansion valve 25 shown is as follows: Figure 12The waste heat recovery heat exchanger 26 is shown. A second condenser heat exchange unit 32, a second expansion valve 34, and an evaporator heat exchange unit 35 are connected in series via a second refrigerant circuit 3 outside the valve island 9 between the second external interface 92 and the fourth external interface 94. The aforementioned first external interface 91, second external interface 92, and sixth external interface 912 can be configured such that one end connects to the outer wall of the valve island 9 for connecting to external pipelines, and the other end connects to corresponding components inside the valve island 9. The first external interface 91, second external interface 92, fourth external interface 94, and sixth external interface 912 can be considered as extension interfaces connecting the corresponding components to external pipelines via the valve island 9, and are all integrated within the single valve island 9.

[0030] In the above structure, the waste heat recovery heat exchanger 26 includes a refrigerant passage and a water-cooled passage that are thermally coupled to each other. The two ends of the refrigerant passage are connected to a refrigerant heat exchange inlet 26C and a refrigerant heat exchange outlet 26D, respectively. The refrigerant heat exchange inlet 26C is connected to the third expansion valve 25 via an external pipeline, and the refrigerant heat exchange outlet 26D is connected to the sixth external interface 912 via an external pipeline. The first external interface 91 is mainly used to connect to the inlet of the first condenser heat exchange unit 22, and the fourth external interface 94 is mainly used to connect to the external evaporator heat exchange unit 35. That is to say, in this invention, the first external interface 91 and the sixth external interface 912 are connected in series to form the entire external first refrigerant circuit 2, and the second external interface 92 and the fourth external interface 94 are connected in series to form the entire external second refrigerant circuit 3, serving as the connection point for the internal and external connection of the heat pump integrated module.

[0031] The third expansion valve 25 can adopt a similar structure to the second expansion valve 34, and can be connected to the valve island 9 via a corresponding external pipeline.

[0032] The first external interface 91 and the second external interface 92 are located on the same surface of the valve island 9, mainly for convenient simultaneous installation and maintenance of two check valves. The fourth external interface 94 and the sixth external interface 912 are located on independent surfaces of the valve island 9. The fourth external interface 94 is located on the top surface for easy connection of pipelines, and the sixth external interface 912 is located on the side wall away from the first external interface 91 and the second external interface 92 for easy suspension of the waste heat recovery heat exchanger 26. In particular, in this invention, the battery heat exchange unit 24, the third expansion valve 25, and the waste heat recovery heat exchanger 26 are all externalized outside the heat pump integrated module, and their corresponding pipelines are also excluded from the heat pump integrated module, which greatly reduces the size of the heat pump integrated module.

[0033] In another embodiment, such as Figure 8 , 9As shown, with the third expansion valve 25 and waste heat recovery heat exchanger 26, the third expansion valve 25 and waste heat recovery heat exchanger 26 can be installed on the valve island 9. The refrigerant heat exchange inlet 26C of the waste heat recovery heat exchanger 26 is introduced to the fifth external interface 911 of the valve island 9, and the third expansion valve 25 and the fifth external interface 911 are connected through the fifth channel 99 opened in the valve island 9, realizing the integrated access of the third expansion valve 25 and waste heat recovery heat exchanger 26. In another preferred embodiment, in order to reduce the volume of the valve island 9, the third expansion valve 25 and waste heat recovery heat exchanger 26 can be connected by external pipelines, which facilitates installation and minimizes the size of the heat pump integrated module.

[0034] Please see details. Figure 10-11 This is an embodiment of the small-volume triangular cycle heat pump integrated system of the present invention installed in a specific and complete thermal management system, wherein... Figure 10 This is a general schematic diagram of the thermal management system. Figure 11 This is a schematic diagram of the interfaces connecting the present invention to the thermal management system. Figure 11 The dashed box in the figure represents the scope of the heat pump integrated module of the present invention.

[0035] The thermal management system includes: The first refrigerant circuit 2 includes a first check valve 21, a first condenser heat exchange unit, a first expansion valve 23, and at least one functional component with heat exchange function, which are arranged in series. The two ends of the first refrigerant circuit 2 are respectively connected to the suction port and the discharge port of the compressor 1. The second refrigerant circuit 3 comprises a second check valve 31, a second condenser heat exchange unit, a second expansion valve 34, and an evaporator heat exchange unit arranged in series. The outlet of the second condenser heat exchange unit is also connected to the inlet of the first expansion valve 23. The two ends of the second refrigerant circuit 3 are respectively connected to the suction port and the discharge port of the compressor 1. The return circuit 4 consists of a compressor 1 and a return expansion valve 41 connected in series. The two ends of the return circuit 4 are connected to the suction port and the discharge port of the compressor 1, respectively, so as to guide at least part of the refrigerant back to the compressor 1 through the return expansion valve 41 during the operation of the compressor 1, so as to control the outlet temperature of the compressor 1.

[0036] Based on the above-described structure of the present invention, during operation, with the compressor 1 as the base and the first check valve 21 open, the compressed refrigerant is discharged into the first refrigerant circuit 2. When the refrigerant flows through the first condenser heat exchange unit 22, it heats the first condenser heat exchange unit 22 and the passenger compartment. When it flows through the first expansion valve 23, it is throttled to a low temperature and low pressure state, and then flows into the corresponding heat exchange unit downstream for heat exchange, and finally returns from the suction port side of the compressor 1.

[0037] With the second check valve 31 open, the compressed refrigerant is discharged into the second refrigerant circuit 3. As the refrigerant flows through the second condenser heat exchange unit 32, it heats or dissipates heat. When it flows through the second expansion valve 34, it is throttled to a low-temperature, low-pressure state, and then flows into the downstream evaporator heat exchange unit 35 for heat exchange, cooling the passenger compartment. Finally, it returns from the suction port side of the compressor 1. Alternatively, it can flow from the second condenser heat exchange unit 32 to the first expansion valve 23, where it is throttled to a low-temperature, low-pressure state, and then flows into the corresponding downstream heat exchange unit for heat exchange, finally returning from the suction port side of the compressor 1.

[0038] Meanwhile, during the operation of compressor 1, a portion of the refrigerant discharged from compressor 1 is diverted through return loop 4 to return expansion valve 41, and then throttled back to the suction port of compressor 1. This refrigerant has a higher temperature than the refrigerant returning to the first refrigerant loop 2 and the second refrigerant loop 3. Through multiple and continuous cycles, the outlet temperature of compressor 1 is regulated, resulting in a higher outlet temperature compared to the case without return loop 4. Therefore, this invention can increase the discharge temperature of compressor 1 at low temperatures by setting return loop 4, while directly using the refrigerant to exchange heat with the corresponding functional components with heat exchange function, achieving higher integration compared to indirect liquid cooling heat exchange. Specifically, after compressor 1 heats the refrigerant, it directly returns to compressor 1 through return loop 4. Through multiple cycles, the outlet temperature of compressor 1 reaches the specified temperature, thereby increasing the heating speed of compressor 1 at low temperatures and making it more adaptable to extreme low-temperature environments.

[0039] In the above structure of the present invention, in the first refrigerant circuit 2, the corresponding functional element with heat exchange function is directly heat exchanged through the refrigerant. The first condenser heat exchange unit 22, the second condenser heat exchange unit 32 and the expansion generator 35 are also directly heat exchanged through the refrigerant. Compared with the method that requires heat exchange through coolant, the circuit length of the coolant is reduced, so that the overall volume is compressed to the maximum extent.

[0040] Furthermore, the functional components for heat exchange between the first expansion valve 23 and the compressor 1 include a battery heat exchange unit 24, a third expansion valve 25, and a waste heat recovery heat exchanger 26, all connected in series. The waste heat recovery heat exchanger 26 includes a refrigerant passage and a water-cooling passage. The refrigerant passage is connected in series between the battery heat exchange unit 24, the third expansion valve 25, and the compressor 1, and the refrigerant passage and the water-cooling passage are thermally coupled to each other. Specifically, by directly connecting the battery heat exchange unit 24 in the passage of the first refrigerant circuit 2, the refrigerant, under the control of the first expansion valve 23, the second expansion valve 34, etc., directly dissipates heat or cools the battery heat exchange unit 24 and the waste heat recovery heat exchanger 26.

[0041] Furthermore, a first check valve is provided between the first condenser heat exchange unit 22 and the first expansion valve 23. A battery heat exchange auxiliary circuit 7 is connected in parallel to the battery heat exchange unit 24. The first end of the battery heat exchange auxiliary circuit 7 is connected between the first condenser heat exchange unit 22 and the first check valve 27, and the second end of the battery heat exchange auxiliary circuit 7 is connected to the outlet end of the battery heat exchange unit 24. A second check valve 71 is provided on the battery heat exchange auxiliary circuit 7. Through the cooperation of the battery heat exchange auxiliary circuit 7 and the two check valves, it can be determined whether the refrigerant is allowed to pass through the battery heat exchange unit 24 and undergo heat exchange.

[0042] The aforementioned first expansion valve 23 and return expansion valve 41 are configured as large-diameter double needle expansion valves, which have a throttling mode that can throttle the refrigerant passing through and a straight-through mode that allows the refrigerant to flow normally.

[0043] Based on the above system layout, the following are examples of various operating modes that can be implemented.

[0044] In one operating mode, in response to the vehicle cabin heating demand, the passenger cabin is heated, and temperature control refers to maintaining the temperature within a certain range, such as 20℃-30℃. In this mode, the first check valve 21 is open, the second check valve 31 is closed, the compressor 1 is running, and the refrigerant flows from the compressor 1 exhaust port to the first condenser heat exchange unit 22. With the help of the heater core 28 on one side, the first condenser heat exchange unit 22 releases heat to the passenger cabin, directly providing warm air to the passenger cabin. The first one-way valve 27 is closed, the second one-way valve 71 is open, and finally the refrigerant passes through the battery heat exchange unit 24 and returns to the compressor 1.

[0045] In one operating mode, simultaneously responding to the vehicle cabin heating demand and the battery pack heating demand, the passenger cabin is heated, and the battery pack is heated. Temperature control refers to maintaining the temperature within a certain range, such as 20℃-30℃. In this mode, the first check valve 21 is open, the second check valve 31 is closed, the compressor 1 operates, and the refrigerant flows from the compressor 1 exhaust port to the first condenser heat exchange unit 22. With the help of the heater core 28 on one side, the first condenser heat exchange unit 22 releases heat to the passenger cabin, directly providing warm air to the passenger cabin. The first one-way valve 27 is open, the second one-way valve 71 is closed, and the first expansion valve 23 is opened to the direct-flow mode. The refrigerant directly passes through the first expansion valve 23, then through the battery heat exchange unit 24 and exchanges heat with it, thereby heating the battery pack, and finally returns to the compressor 1.

[0046] In one operating mode, simultaneously responding to the vehicle cabin heating demand and the battery pack cooling demand, the passenger cabin is heated while the battery pack is cooled. Temperature control refers to maintaining the temperature within a certain range, such as 20℃-30℃. In this mode, the first check valve 21 is open, the second check valve 31 is closed, the compressor 1 operates, and the refrigerant flows from the compressor 1 exhaust port to the first condenser heat exchange unit 22. The refrigerant, aided by the side-mounted heater core 28, releases heat to the passenger cabin through the first condenser heat exchange unit 22, directly providing warm air to the passenger cabin. The first one-way valve 27 is open, the second one-way valve 71 is closed, and the first expansion valve 23 is opened to throttling mode. The refrigerant is throttled to a low-temperature, low-pressure state through the first expansion valve 23, then passes through the battery heat exchange unit 24 and exchanges heat with it, achieving cooling of the battery pack, and finally returns to the compressor 1.

[0047] In one operating mode, in response to the vehicle cabin's heating and dehumidification needs, the passenger cabin is heated and dehumidified. Temperature control refers to maintaining the temperature within a certain range, such as 20℃-30℃. In this mode, the first check valve 21 is open, the second check valve 31 is open, the compressor 1 operates, and the refrigerant flows from the compressor 1's exhaust port to the first condenser heat exchange unit 22. With the help of the side-mounted heater core 28, the first condenser heat exchange unit 22 releases heat to the passenger cabin, directly providing warm air to the passenger cabin. The first one-way valve 27 is closed, the second one-way valve 71 is open, and finally, the refrigerant passes through the battery heat exchange unit 24 and returns to the compressor 1. Simultaneously, the refrigerant flows from the exhaust port of compressor 1 to the second condenser heat exchange unit 32. The second condenser heat exchange unit 32 dissipates heat to the outside with the help of a blower on one side. Then it flows through the second expansion valve 34 for throttling. After the refrigerant is cooled and depressurized, it flows through the evaporator heat exchange unit 35. The passenger cabin is dehumidified by the cooling and condensation of the evaporator heat exchange unit 35. Then it returns to compressor 1.

[0048] In one operating mode, in response to the vehicle cabin's cooling needs, the passenger cabin is cooled, with temperature control referring to maintaining the temperature within a certain range, such as 20℃-30℃. In this mode, the first check valve 21 is closed, the second check valve 31 is open, the compressor 1 operates, and the refrigerant flows from the compressor 1's exhaust port to the second condenser heat exchange unit 32. A blower on one side dissipates heat from the second condenser heat exchange unit 32, and then flows to the second expansion valve 34 for throttling. After the refrigerant cools and depressurizes, it flows through the evaporator heat exchange unit 35. With the help of the evaporator heat exchange unit 35 and the blower on one side, the passenger cabin is cooled, and then the refrigerant returns to the compressor 1.

[0049] In one operating mode, in response to the cooling demand of the vehicle battery pack assembly, the battery pack is cooled, and temperature control refers to keeping the temperature within a certain range, such as 20℃-30℃. In this mode, the first check valve 21 is closed, the second check valve 31 is open, the compressor 1 is running, and the refrigerant flows from the exhaust port of the compressor 1 to the second condenser heat exchange unit 32. With the help of a blower on one side, the second condenser heat exchange unit 32 dissipates heat to the outside, and then flows to the first expansion valve 23 for throttling. After the refrigerant is cooled and depressurized, it flows through the battery heat exchange unit 24 and exchanges heat with it, thereby cooling the battery pack, and finally returns to the compressor 1.

[0050] In one mode, simultaneously responding to the vehicle cabin's direct cooling needs and the battery pack's cooling needs, the passenger cabin and the battery pack are cooled. Temperature control refers to maintaining the temperature within a certain range, such as 20℃-30℃. In this mode, the first check valve 21 is closed, the second check valve 31 is open, the compressor 1 operates, and refrigerant flows from the compressor 1's exhaust port to the second condenser heat exchange unit 32. A blower on one side dissipates heat from the second condenser heat exchange unit 32, then flows to the second expansion valve 34 for throttling. After cooling and depressurizing, the refrigerant flows to the evaporator heat exchange unit 35. With the help of the evaporator heat exchange unit 35 and the blower on one side, the passenger cabin is cooled, and then the refrigerant returns to the compressor 1. Simultaneously, a portion of the refrigerant flows to the first expansion valve 23 for throttling. After cooling and depressurizing, the refrigerant flows to the battery heat exchange unit 24 and exchanges heat with it, cooling the battery pack, and finally returns to the compressor 1.

[0051] Furthermore, in another scheme, a first three-way water valve 5 and a second three-way water valve 6 can be set to control the external coolant pipeline, so as to realize the heat exchange management of the waste heat recovery heat exchanger 26, radiator 33 and drive motor heat exchange unit 8. The following are some specific schemes.

[0052] In one mode, the water-cooled passage of the waste heat recovery heat exchanger 26 is connected in series with a water-cooled heat exchange outlet 26B, a drive motor heat exchange unit 8, a first three-way water valve (first port 51), a first three-way water valve (second port 52), a second three-way water valve (first port 61), a second three-way water valve (second port 62), and a water-cooled heat exchange inlet 26A. The coolant flows sequentially through the water-cooled heat exchange outlet 26B, the drive motor heat exchange unit 8, the first three-way water valve (first port 51), the first three-way water valve (second port 52), the second three-way water valve (first port 61), and the second three-way water valve (second port 62) before returning to the water-cooled heat exchange inlet 26A. In this scheme, the coolant can be connected in series and flow between the waste heat recovery heat exchanger 26 and the drive motor heat exchange unit 8 as needed, thereby achieving temperature control of the drive motor heat exchange unit 8.

[0053] In one configuration, the water-cooling path connects in series with a water-cooled heat exchange outlet 26B, a drive motor heat exchange unit 8, a first three-way water valve (first port 51), a first three-way water valve (third port 53), a radiator 33, a second three-way water valve (first port 61), a second three-way water valve (second port 62), and a water-cooled heat exchange inlet 26A. The coolant flows sequentially through the water-cooled heat exchange outlet 26B, the drive motor heat exchange unit 8, the first three-way water valve (first port 51), the first three-way water valve (third port 53), the radiator 33, the second three-way water valve (first port 61), and the second three-way water valve (second port 62) before returning to the water-cooled heat exchange inlet 26A. In this configuration, the coolant can be connected in series and flow between the waste heat recovery heat exchanger 26, the drive motor heat exchange unit 8, and the radiator 33 as needed, enabling temperature control of the drive motor heat exchange unit 8 and waste heat recovery from the radiator 33.

[0054] In one mode, an auxiliary water-cooling passage is connected in parallel to the first three-way water valve 5. The auxiliary water-cooling passage connects in series with the drive motor heat exchange unit 8, the first valve port 51 of the first three-way water valve, the second valve port 52 of the first three-way water valve, the first valve port 61 of the second three-way water valve, and the third valve port 63 of the second three-way water valve. The coolant flows sequentially through the drive motor heat exchange unit 8, the first valve port 51 of the first three-way water valve, the second valve port 52 of the first three-way water valve, the first valve port 61 of the second three-way water valve, and the third valve port 63 of the second three-way water valve before returning to the auxiliary water-cooling passage. In this scheme, the coolant can flow through the drive motor heat exchange unit 8 as needed, thereby achieving temperature control of the drive motor heat exchange unit 8.

[0055] In one mode, an auxiliary water-cooling passage is connected in parallel to the first three-way water valve 5. The auxiliary water-cooling passage connects in series the drive motor heat exchange unit 8, the first valve port 51 of the first three-way water valve, the third valve port 53 of the first three-way water valve, the radiator 33, the first valve port 61 of the second three-way water valve, and the third valve port 63 of the second three-way water valve. The coolant flows sequentially through the drive motor heat exchange unit 8, the first valve port 51 of the first three-way water valve, the third valve port 53 of the first three-way water valve, the radiator 33, the first valve port 61 of the second three-way water valve, and the third valve port 63 of the second three-way water valve before returning to the auxiliary water-cooling passage. In this scheme, the coolant can be connected in series and flow between the drive motor heat exchange unit 8 and the radiator 33 as needed, achieving temperature control of the drive motor heat exchange unit 8 and recovering waste heat from the radiator 33.

[0056] In this application, a gas-liquid separator 11 is connected to one end of the compressor 1's inlet. The separator 11 can buffer the high-temperature, high-pressure refrigerant from the upstream side, preventing it from directly impacting the compressor 1's cylinder and extending the compressor 1's service life. A low-pressure charging port 12 is connected to one end of the gas-liquid separator 11, allowing for the charging of refrigerant into the refrigerant circulation pipeline or pipeline maintenance as needed.

[0057] The content disclosed above is only a preferred and feasible embodiment of the present invention, and is not intended to limit the scope of the patent application of the present invention. Therefore, all equivalent technical changes made using the contents of the present invention specification and drawings are included in the scope of the patent application of the present invention.

[0058] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0059] Although this application has been described by way of examples, those skilled in the art will know that this application has many modifications and variations without departing from the spirit of this application, and it is intended that the appended embodiments include these modifications and variations without departing from this application.

Claims

1. A small-volume triangular cycle heat pump integrated system, characterized in that, The small-volume triangular cycle heat pump integrated system includes: First refrigerant circuit; Second refrigerant circuit; The heat pump module includes: a compressor, a valve island mounted on the compressor, and... A first check valve, a second check valve, a reflux expansion valve, and a gas-liquid separator are installed on the valve island. The valve island includes an internally through-flow channel mechanism for the flow of refrigerant. The first check valve, the second check valve, the reflux expansion valve, the gas-liquid separator, and the refrigerant passage are respectively connected to the flow channel mechanism. The flow channel mechanism includes a reflux circuit for connecting the compressor's exhaust port to the reflux expansion valve. The valve island further includes a first external interface, a second external interface, a fourth external interface, and a sixth external interface. The first external interface is connected to the first check valve through the valve island. The second external interface is connected to the second check valve through the valve island. The fourth external interface is connected to the separation inlet of the gas-liquid separator through the valve island. The sixth external interface is connected to the flow channel mechanism through the valve island and is used to connect to the outlet of at least one functional element with heat exchange function outside the valve island. The first external interface and the second external interface are disposed on the same surface of the valve island, and the fourth external interface and the sixth external interface are respectively disposed on independent surfaces of the valve island; The first external interface and the sixth external interface are connected in series via a first refrigerant circuit outside the valve island, consisting of a first condenser heat exchange unit, a first expansion valve, and at least one functional element with heat exchange function; the refrigerant can flow sequentially through the first external interface, the first condenser heat exchange unit, the first expansion valve, and at least one of the functional elements with heat exchange function before returning to the sixth external interface. The second external interface and the fourth external interface are connected in series via a second refrigerant circuit outside the valve island, consisting of a second condenser heat exchange unit, a second expansion valve, and an evaporator heat exchange unit. The refrigerant can flow sequentially through the second external interface, the second condenser heat exchange unit, the second expansion valve, and the evaporator heat exchange unit before returning to the fourth external interface.

2. The small-volume triangular cycle heat pump integrated system according to claim 1, characterized in that: The sixth external interface is oriented toward the first direction, while the first external interface and the second external interface are oriented toward the second direction away from the first direction.

3. The small-volume triangular cycle heat pump integrated system according to claim 2, characterized in that: The fourth external interface is oriented in a direction perpendicular to the first direction and the second direction.

4. The small-volume triangular cycle heat pump integrated system according to claim 1, characterized in that: The compressor has a preset center of mass, and the center of mass of the valve island, the first check valve, the second check valve, the reflux expansion valve, and the gas-liquid separator is adjacent to or located on the vertical plane of the preset center of mass.

5. The small-volume triangular cycle heat pump integrated system according to claim 1, characterized in that: The flow channel mechanism includes a first channel, a second channel, a third channel, a fourth channel, and a sixth channel. The compressor's exhaust port is connected to the first check valve through the first channel, the compressor's exhaust port is connected to the second check valve through the second channel, the compressor's exhaust port is connected to the reflux expansion valve through the third channel, the reflux expansion valve is connected to the separation inlet of the gas-liquid separator through the fourth channel, the separation outlet of the gas-liquid separator is directly connected to the compressor's suction port, and the sixth external interface is connected to the separation inlet of the gas-liquid separator through the sixth channel.

6. The small-volume triangular cycle heat pump integrated system according to claim 1, characterized in that: The first external interface and the sixth external interface are connected in series via a first refrigerant circuit outside the valve island, consisting of a first condenser heat exchange unit, a first expansion valve, and at least one functional component with heat exchange function.

7. The small-volume triangular cycle heat pump integrated system according to claim 6, characterized in that: The functional components with heat exchange function include a battery heat exchange unit, a third expansion valve, and a waste heat recovery heat exchanger arranged in sequence.

8. The small-volume triangular cycle heat pump integrated system according to claim 7, characterized in that: The waste heat recovery heat exchanger includes a refrigerant passage and a water cooling passage that are thermally coupled to each other. The two ends of the refrigerant passage are respectively connected to a refrigerant heat exchange inlet and a refrigerant heat exchange outlet. The refrigerant heat exchange inlet is connected to the fifth external interface, and the refrigerant heat exchange outlet is connected to the third expansion valve.

9. The small-volume triangular cycle heat pump integrated system according to claim 1, characterized in that: The second external interface and the fourth external interface are connected in series via a second refrigerant circuit outside the valve island, consisting of a second condenser heat exchange unit, a second expansion valve, and an evaporator heat exchange unit.

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