Heat pump air conditioning system

Abstract

The utility model belongs to the technical field of vehicle-mounted air conditioner, disclose a kind of heat pump air conditioning system. The heat pump air conditioning system includes cooling liquid circuit and refrigerant circuit, and the refrigerant circuit includes electric compressor, second proportional three-way valve, external condenser, bypass pipeline and water-cooled condenser, second proportional three-way valve is connected in electric compressor, and external condenser and bypass pipeline are only connected in second proportional three-way valve, and water-cooled condenser is connected in external condenser and bypass pipeline respectively. If the phenomenon of excess heating capacity appears, by adjusting second proportional three-way valve, heat can be released through external condenser, so that heating power is reduced with simplified structure, to avoid the phenomenon that temperature is too high and frequently switches working mode, causes the phenomenon that electric compressor and other parts frequently switch working state, it is favorable to guarantee the service life of relevant parts and entire heat pump air conditioning system.

Description

Technical Field

[0001] This utility model relates to the field of vehicle air conditioning technology, and in particular to a heat pump air conditioning system. Background Technology

[0002] With the rapid development of new energy vehicles, users' demands for driving range and comfort are increasing. However, heat pump air conditioning systems, even in heating mode, still experience frequent switching of operating modes due to excessive heating capacity. This frequent switching of operating modes complicates the control of the entire heat pump air conditioning system and is detrimental to its simplification and lifespan.

[0003] Therefore, there is an urgent need for a heat pump air conditioning system to solve the above-mentioned technical problems. Utility Model Content

[0004] The purpose of this invention is to provide a heat pump air conditioning system that can avoid the problem of frequent switching of working modes due to excessive heating capacity.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A heat pump air conditioning system includes a coolant circuit and a refrigerant circuit, wherein the refrigerant circuit includes:

[0007] Electric compressor;

[0008] The second proportional three-way valve has its inlet end connected to the high-pressure side of the electric compressor.

[0009] An external condenser is connected to one outlet end of the second proportional three-way valve;

[0010] A bypass line, the inlet end of which is connected to the other outlet end of the second proportional three-way valve;

[0011] A water-cooled condenser, the inlet of which is connected to the outlet of the external condenser and the outlet of the bypass pipe.

[0012] In some embodiments, the refrigerant circuit further includes an electronic refrigerant valve, the inlet of which is connected to the high-pressure side of the electric compressor, and the outlet of which is connected to the low-pressure side of the electric compressor.

[0013] In some embodiments, the refrigerant circuit further includes a refrigerant channel for a first water-cooled cooler, through which refrigerant can flow through the first water-cooled cooler. The coolant circuit includes a first circuit comprising a coolant channel for the first water-cooled cooler and a battery pack assembly, wherein coolant can circulate between the coolant channel for the first water-cooled cooler and the battery pack assembly.

[0014] The refrigerant and the coolant can exchange heat when flowing through the first water-cooled cooler, and the coolant can absorb or release heat when flowing through the battery pack assembly.

[0015] In some embodiments, the refrigerant circuit further includes a refrigerant channel for a second water-cooled cooler, through which the refrigerant can flow through the second water-cooled cooler. The coolant circuit further includes a second circuit, which includes a coolant channel for the second water-cooled cooler and a cooling core, through which the coolant can circulate between the coolant channel for the second water-cooled cooler and the cooling core.

[0016] The refrigerant and the coolant can exchange heat when flowing through the second water-cooled cooler, and the coolant can absorb heat when flowing through the cold core.

[0017] In some embodiments, the refrigerant circuit further includes a first throttle valve and a second throttle valve, wherein the first throttle valve and the first water-cooled cooler are sequentially connected between the outlet end of the water-cooled condenser and the low-pressure side of the electric compressor, and the second throttle valve and the second water-cooled cooler are sequentially connected between the outlet end of the water-cooled condenser and the low-pressure side of the electric compressor.

[0018] In some embodiments, the water-cooled condenser includes a refrigerant flow channel through which the refrigerant can flow. The coolant circuit further includes a third circuit comprising the coolant flow channel of the water-cooled condenser, a heater core, and a low-temperature radiator. Coolant can flow between the coolant flow channel, the heater core, and the low-temperature radiator.

[0019] The refrigerant and the coolant can exchange heat when flowing through the water-cooled condenser, and the coolant can release heat when flowing through the heating core and the low-temperature radiator.

[0020] In some embodiments, the third circuit further includes a motor assembly connected between the low-temperature radiator and the water-cooled condenser, wherein the coolant can flow sequentially through the low-temperature radiator, the motor assembly, and the water-cooled condenser.

[0021] In some embodiments, a first proportional three-way valve is connected between the heating element and the low-temperature radiator, the first proportional three-way valve being used to adjust the ratio of the flow rate of the coolant through the heating element and the low-temperature radiator.

[0022] In some embodiments, the coolant circuit further includes an expansion tank.

[0023] In some embodiments, a first five-way regulating valve and a second five-way regulating valve are coupled between the first circuit and the third circuit, and the first five-way regulating valve and the second five-way regulating valve are used to adjust the ratio of the flow rate of the coolant through the first circuit and the third circuit.

[0024] The above-mentioned technical solution has the following advantages or beneficial effects: When using the heat pump air conditioning system, if there is an excess of heating capacity, the heat can be released through the external condenser by adjusting the second proportional three-way valve. This reduces the heating power with a simplified structure, avoids frequent switching of working modes due to excessively high temperatures, and prevents frequent switching of working states of components such as the electric compressor. This helps to ensure the service life of related components and the entire heat pump air conditioning system. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the heat pump air conditioning system in the first heating mode in an embodiment of this utility model;

[0026] Figure 2 This is a schematic diagram of the heat pump air conditioning system in the second heating mode in an embodiment of this utility model;

[0027] Figure 3 This is a schematic diagram of the heat pump air conditioning system in the first cooling mode in an embodiment of this utility model;

[0028] Figure 4 This is a schematic diagram of a heat pump air conditioning system in a dehumidification mode according to an embodiment of this utility model;

[0029] Figure 5 This is a schematic diagram of a heat pump air conditioning system in a defrosting mode according to an embodiment of this utility model;

[0030] Figure 6 This is a schematic diagram of the heat pump air conditioning system in the second cooling mode in an embodiment of this utility model;

[0031] Figure 7 This is a schematic diagram of the heat pump air conditioning system in the third cooling mode in an embodiment of this utility model;

[0032] Figure 8 This is a schematic diagram of the heat pump air conditioning system in the first heating and dehumidification mode in an embodiment of this utility model;

[0033] Figure 9 This is a schematic diagram of the heat pump air conditioning system in the second heating and dehumidification mode in an embodiment of this utility model;

[0034] Figure 10 This is a schematic diagram of the heat pump air conditioning system in the third heating and dehumidification mode in an embodiment of this utility model.

[0035] In the picture:

[0036] 1. Electric compressor; 2. First water-cooled cooler; 3. Second water-cooled cooler; 4. Blower; 5. Cooling core; 6. Heating core; 7. First water pump; 8. First proportional three-way valve; 9. Second water pump; 10. Battery pack assembly; 11. First five-way regulating valve; 12. Second five-way regulating valve; 13. Electronic refrigerant valve; 14. Second proportional three-way valve; 15. Low-temperature radiator; 16. External condenser; 17. Cooling fan; 18. First check valve; 19. Third water pump; 20. Water-cooled condenser; 21. Receiver tank; 22. First throttle valve; 23. Second throttle valve; 24. Fourth water pump; 25. Motor assembly; 26. Expansion tank. Detailed Implementation

[0037] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0038] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," "fixed," and "abutting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0039] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0040] In the description of this embodiment, the terms "upper," "lower," "right," and "left," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0041] The following is based on Figures 1 to 10 This invention introduces a heat pump air conditioning system provided in an embodiment of the present invention.

[0042] like Figure 1 As shown, in this embodiment, the heat pump air conditioning system includes a refrigerant circuit and a coolant circuit. Specifically, the refrigerant circuit includes an electric compressor 1, a second proportional three-way valve 14, an external condenser 16, a bypass pipe, a water-cooled condenser 20, a liquid receiver 21, a first throttle valve 22, a first water-cooled cooler 2, a second throttle valve 23, a second water-cooled cooler 3, etc., and in different operating modes, the refrigerant selectively flows through some components in the refrigerant circuit. The coolant circuit includes a cooling core 5, a heating core 6, a first water pump 7, a first proportional three-way valve 8, a second water pump 9, a battery pack assembly 10, a low-temperature radiator 15, a water-cooled condenser 20, a first water-cooled cooler 2, a second water-cooled cooler 3, a third water pump 19, a motor assembly 25, etc., and in different operating modes, the coolant selectively flows through some components in the coolant circuit.

[0043] In this heat pump air conditioning system, the first water-cooled cooler 2, the second water-cooled cooler 3, and the water-cooled condenser 20 are each equipped with a coolant flow channel and a refrigerant flow channel. The coolant flow channel is for the flow of coolant, and the refrigerant flow channel is for the flow of refrigerant, allowing for heat exchange between the coolant and the refrigerant. Both the first water-cooled cooler 2 and the second water-cooled cooler 3 are evaporators, utilizing the heat exchange between the coolant and the refrigerant to allow the refrigerant to absorb heat and evaporate. In the water-cooled condenser 20, the coolant serves as the cooling medium, condensing the high-temperature, high-pressure refrigerant gas into a liquid through heat exchange, while simultaneously carrying away the heat from the refrigerant.

[0044] Continue to refer to Figure 1 As shown, in this embodiment, the high-pressure side of the electric compressor 1 is connected to the inlet end of the second proportional three-way valve 14. The second proportional three-way valve 14 has two outlet ends, one of which is connected to the inlet end of the external condenser 16, and the other outlet end is connected to the inlet end of the bypass pipeline. The outlet end of the external condenser 16 and the inlet end of the bypass pipeline are both connected to the inlet end of the refrigerant flow channel of the water-cooled condenser 20. At this time, the external condenser 16 and the bypass pipeline are connected in parallel between the electric compressor 1 and the water-cooled condenser 20, and through the second proportional three-way valve 14, the flow rate of refrigerant distributed to the external condenser 16 and the bypass pipeline can be adjusted according to different usage scenarios, thereby realizing different operating modes.

[0045] For example, in some embodiments, the second proportional three-way valve 14 can be adjusted to allow the refrigerant to pass through both the external condenser 16 and the bypass pipe simultaneously. In this case, excess heat in the water-cooled condenser 20 can be released into the environment through the external condenser 16, thus resolving the problem of frequent switching of operating modes caused by excessive heating capacity in heating mode, and avoiding frequent switching between heating mode and standby mode or between heating mode and other modes in the heat pump air conditioning system. Simultaneously, the external condenser 16 can also operate independently. In this case, by adjusting the coolant circuit to prevent coolant from flowing into the coolant channel of the water-cooled condenser 20, the refrigerant can maintain a high-temperature, high-pressure gaseous state as it flows through the water-cooled condenser 20. Of course, the water-cooled condenser 20 can also operate independently. In this case, simply adjusting the second proportional three-way valve 14 allows the refrigerant to flow into the water-cooled condenser 20 only through the bypass pipe, preventing the heat of the refrigerant from being released to the outside through the external condenser 16, thereby meeting the heating requirements in low-temperature environments. Optionally, a cooling fan 17 is provided at the external condenser 16, which can promote the external condenser 16 to release heat to the environment through air cooling.

[0046] Therefore, when using this heat pump air conditioning system, if there is an excess of heating capacity, the heat can be released through the external condenser 16 by adjusting the second proportional three-way valve 14. This reduces the heating power with a simplified structure, avoids frequent switching of working modes due to excessively high temperatures, and prevents the electric compressor 1 and other components from frequently switching their working states. This helps to ensure the service life of related components and the entire heat pump air conditioning system.

[0047] Furthermore, after the refrigerant flows out of the water-cooled condenser 20, it first passes through the liquid receiver 21, then splits into two paths, flowing into the first water-cooled cooler 2 and the second water-cooled cooler 3 respectively, before merging into one path and flowing into the electric compressor 1. A first throttling valve 22 is provided between the liquid receiver 21 and the first water-cooled cooler 2, and a second throttling valve 23 is provided between the liquid receiver 21 and the second water-cooled cooler 3. The first throttling valve 22 and the second throttling valve 23 can achieve the process of throttling and reducing pressure. Of course, in some embodiments, the liquid receiver 21 can also be connected to other locations in the refrigerant circuit, as long as the first throttling valve 22 and the first water-cooled cooler 2 are sequentially connected between the outlet end of the water-cooled condenser 20 and the low-pressure side of the electric compressor 1, and the second throttling valve 23 and the second water-cooled cooler 3 are sequentially connected between the outlet end of the water-cooled condenser 20 and the low-pressure side of the electric compressor 1.

[0048] Furthermore, such as Figure 1 As shown, the refrigerant circuit also includes an electronic refrigerant valve 13. The inlet of the electronic refrigerant valve 13 is connected to the high-pressure side of the electric compressor 1, and the outlet of the electronic refrigerant valve 13 is connected to the low-pressure side of the electric compressor 1. When the heating capacity is sufficient, the electronic refrigerant valve 13 is in the closed state. When the heating capacity is insufficient, the electronic refrigerant valve 13 opens according to a preset opening degree, allowing some refrigerant to flow directly from the high-pressure side of the electric compressor 1 through the electronic refrigerant valve 13 into the low-pressure side of the electric compressor 1, thereby using the work of the electric compressor 1 to make up for the heating shortfall. In other words, the electronic refrigerant valve 13 forms a hot gas bypass pipeline at the electric compressor 1, enabling the entire heat pump air conditioning system to still provide normal heating at lower ambient temperatures, thus allowing the heat pump air conditioning system to be compatible with various refrigerants such as R134a, 1234yf, R290, and mixed refrigerants. Meanwhile, since the refrigerant circuits are all located outside the passenger compartment, the refrigerant will not leak into the passenger compartment, and environmentally friendly flammable refrigerants can be used.

[0049] The coolant circuit includes a first circuit, a second circuit, and a third circuit. The first circuit includes a first water-cooled cooler 2, a second five-way regulating valve 12, a second water pump 9, a battery pack assembly 10, and a first five-way regulating valve 11. The coolant circulates sequentially among these components, transferring heat between the first water-cooled cooler 2 and the battery pack assembly 10. The second circuit includes a second water-cooled cooler 3, a cooling core 5, and a first water pump 7. The coolant circulates sequentially among these components, transferring heat between the second water-cooled cooler 3 and the cooling core 5. The third circuit includes a water-cooled condenser 20, a heating element 6, a first proportional three-way valve 8, a third water pump 19, a second five-way regulating valve 12, a low-temperature radiator 15, a fourth water pump 24, a motor assembly 25, and a first five-way regulating valve 11. The first proportional three-way valve 8 is connected between the heating element 6 and the low-temperature radiator 15 and can adjust the ratio of the flow rate of coolant through the heating element 6 and the low-temperature radiator 15 (and the motor assembly 25). Under the control of the first proportional three-way valve 8, the coolant can circulate sequentially among the water-cooled condenser 20, the heater core 6, the first proportional three-way valve 8, and the third water pump 19; or sequentially among the water-cooled condenser 20, the heater core 6, the first proportional three-way valve 8, and the third water pump 19; or sequentially among the water-cooled condenser 20, the heater core 6, the first proportional three-way valve 8, the second five-way regulating valve 12, the low-temperature radiator 15, the fourth water pump 24, the motor assembly 25, the first five-way regulating valve 11, and the third water pump 19; or sequentially among the water-cooled condenser 20, the heater core 6, the first proportional three-way valve 8, the second five-way regulating valve 12, the low-temperature radiator 15, the fourth water pump 24, the motor assembly 25, the first five-way regulating valve 11, and the third water pump 19. Simultaneously, expansion tanks 26 are connected to the first, second, and third circuits, allowing for volume changes in the coolant.

[0050] Continue to refer to Figure 1 As shown, the heat pump air conditioning system can also absorb the heat generated by the battery pack to achieve a heating mode for the passenger compartment.

[0051] Specifically, in the refrigerant circuit, the electric compressor 1 compresses the refrigerant into a high-temperature, high-pressure gaseous state, and selectively introduces it into the water-cooled condenser 20 via the second proportional three-way valve 14, either through the external condenser 16, a bypass line, or both. This allows the refrigerant to release heat to the coolant flowing through the water-cooled condenser 20. The refrigerant then continues to flow through the liquid receiver 21, enters the first throttling valve 22 for pressure reduction, and then enters the refrigerant flow channel of the first water-cooled cooler 2 for evaporation and heat absorption, absorbing heat from the coolant. Finally, it returns to the electric compressor 1, completing the refrigerant cycle.

[0052] In the coolant circuit, the coolant absorbs heat as it flows through the coolant channel of the water-cooled condenser 20, and is then transported to the heating core 6 by the third water pump 19. The heat is then delivered into the passenger compartment by the blower 4, achieving the effect of heating the passenger compartment. Meanwhile, the coolant cooled by heat absorption in the first water-cooled condenser 2 is transported to the battery pack assembly 10 by the first water pump 7, absorbing the operating temperature of the battery pack. Then, the coolant returns to the first water-cooled condenser 2 through the first five-way regulating valve 11, continuing to provide heat for refrigerant evaporation, thus completing the heat transfer process and achieving the purpose of inputting the heat generated by the battery pack into the passenger compartment for heating.

[0053] Of course, the first five-way regulating valve 11, the second five-way regulating valve 12, and the first proportional three-way valve 8 can be adjusted to drive the coolant flow through the motor assembly 25 via the fourth water pump 24 and the third water pump 19. This absorbs the heat generated by the motor's operation and transfers the heat to the heating core 6. The heat is then delivered into the passenger compartment by the blower 4, achieving the effect of heating the passenger compartment. It should be noted that the low-temperature radiator 15 is also located at the cooling fan 17. The heat dissipation capacity of both the low-temperature radiator 15 and the external condenser 16 is controlled by the power of the cooling fan 17. Therefore, by controlling the power of the cooling fan 17, the low-temperature radiator 15 can be made to dissipate heat, dissipate only a small amount of heat, or dissipate a large amount of heat. These are all control methods that can be reasonably selected based on the ambient temperature and the heating needs of the passenger compartment, and this utility model does not impose specific limitations on them. Similarly, damper structures are also provided at the cold core 5 and the warm core 6. The damper structures can selectively allow airflow to pass through the cold core 5 (e.g., in cooling mode), or allow airflow to pass through the warm core 6 (e.g., in heating mode), or allow airflow to pass through the cold core 5 first and then through the warm core 6 (e.g., in dehumidification mode). The adjustment effect of the damper structures can be reasonably selected according to the temperature and humidity requirements in the passenger cabin, and no specific limitation is made in this utility model.

[0054] like Figure 2 As shown, in some embodiments, a heating mode that heats both the passenger compartment and the battery pack can be achieved by absorbing the heat generated by the motor and the ambient heat.

[0055] Specifically, in the refrigerant circuit, by adjusting the second proportional three-way valve 14, all the high-temperature, high-pressure gaseous refrigerant discharged from the electric compressor 1 flows into the water-cooled condenser 20 through the bypass pipe, causing the refrigerant to condense and release heat to the coolant flowing through the water-cooled condenser 20. Then, the refrigerant passes through the liquid receiver 21 and enters the first throttling valve 22 for pressure reduction, then enters the first water-cooled cooler 2 for evaporation and heat absorption, and finally returns to the electric compressor 1 to complete the refrigerant cycle.

[0056] In the coolant circuit, the coolant absorbs heat as it flows through the water-cooled condenser 20, and is then pumped into the heater core 6 by the third water pump 19. The heat is then transferred to the passenger compartment by the blower 4, achieving the effect of heating the passenger compartment. The coolant then continues to flow through the first proportional three-way valve 8, and through the adjustment of the first proportional three-way valve 8, at least a portion of the coolant flows into the battery pack assembly 10. Then, the mixing ratio of the coolant and refrigerant in the battery pack assembly 10 is adjusted by the second five-way regulating valve 12 to regulate the target water temperature of the battery pack. After the mixed coolant enters the battery pack assembly 10, it releases heat into the battery pack, achieving the effect of heating the battery pack. After absorbing heat from the battery pack, the coolant returns to the water-cooled condenser 20 through the first five-way regulating valve 11 to continue absorbing heat from the refrigerant, thus completing the heat transfer process.

[0057] It should be noted that, in Figure 2 Based on the shared heating mode of the passenger compartment and battery pack shown, by adjusting the connection state of the second five-way regulating valve 12, coolant can be introduced into the low-temperature radiator 15, thus enabling the recovery of heat generated by the motor operation. Furthermore, in Figure 2 Based on the above, an electronic refrigerant valve 13 can be used to further utilize the electric compressor 1 to meet the heating gap at lower ambient temperatures.

[0058] like Figure 3 As shown, the heat pump air conditioning system can also achieve a cooling mode that cools both the passenger compartment and the battery pack.

[0059] Specifically, in the refrigerant circuit, the electric compressor 1 discharges high-temperature, high-pressure gaseous refrigerant. Through the regulation of the second proportional three-way valve 14, all the refrigerant flows into the external condenser 16, where it condenses and releases heat under the cooling effect of the cooling fan 17. The refrigerant flowing out of the external condenser 16 passes through a one-way valve and the water-cooled condenser 20 before entering the liquid receiver 21. The refrigerant flowing out of the liquid receiver 21 splits into two paths: one path is throttled and depressurized by the first throttling valve 22, becoming a low-temperature, low-pressure two-phase state before entering the first water-cooled cooler 2; the other path is throttled and depressurized by the second throttling valve 23, becoming a low-temperature, low-pressure two-phase state before entering the second water-cooled cooler 3. The refrigerant flowing out of the first water-cooled cooler 2 and the second water-cooled cooler 3 merge into one path and flow back into the electric compressor 1, thus completing the refrigerant cycle.

[0060] In the coolant circuit, the coolant releases heat in the first water-cooled cooler 2, lowering its temperature. Then, after passing through the second five-way regulating valve 12, it flows into the battery pack assembly 10, absorbing the heat generated by the battery pack's operation. It then returns to the first water-cooled cooler 2 via the first five-way regulating valve 11, thus circulating in the first circuit. Simultaneously, the coolant also releases heat in the second water-cooled cooler 3, lowering its temperature, and then enters the cold core 5. The blower 4 delivers the cooling energy to the passenger compartment, achieving cooling for the passenger compartment. The coolant then flows through the first water pump 7 back to the second water-cooled cooler 3, circulating in the second circuit.

[0061] Furthermore, based on the above, when the motor assembly 25 requires heat dissipation, the coolant is sequentially pumped through the third water pump 19 and the fourth water pump 24, passing through the motor assembly 25, the first five-way regulating valve 11, the third water pump 19, the water-cooled condenser 20, the heater core 6, the first proportional three-way valve 8, and the second five-way regulating valve 12, before entering the low-temperature radiator 15. There, the cooling fan 17 lowers the temperature, dissipating the heat of the coolant into the environment. The coolant then flows back into the motor assembly 25 to absorb heat, thus achieving the effect of cooling the motor assembly 25. This enables a combined cooling mode for the passenger compartment, battery pack, and motor.

[0062] like Figure 4 As shown, this heat pump air conditioning system can also adjust the humidity in the passenger compartment as needed. For example, when dehumidification is required in the passenger compartment, refrigerant flows through the second throttle valve 23 and the second water-cooled cooler 3, and the coolant circulates between the cold core 5 and the second water-cooled cooler 3. Under the action of the blower 4, heat exchange occurs with the air entering the passenger compartment, cooling the air and causing a significant condensation of water vapor in the air. The condensed water droplets concentrate on the surface of the cold core 5, thus achieving a dehumidification effect. Simultaneously, coolant also flows between the water-cooled condenser 20 and the heating core 6, allowing the heating core 6 to heat the air. In this way, the air cooled by the cold core 5 receives heat from the heating core 6 and is then sent into the passenger compartment, thereby meeting the passenger compartment's outlet air temperature requirements and ensuring that the passenger compartment temperature does not become too low.

[0063] Of course, when the actual air outlet temperature is higher than the preset temperature, the first proportional three-way valve 8 can be adjusted to allow some coolant to flow through the low-temperature radiator 15 and dissipate heat to the outside environment, thereby reducing the temperature of the heating core 6 and avoiding excessive heating in the passenger compartment.

[0064] like Figure 5As shown, this heat pump air conditioning system can also operate in defrost mode. When the ambient temperature is low, the heat pump air conditioning system needs the low-temperature radiator 15 to absorb heat from the outside environment (i.e., the coolant absorbs heat from the outside environment when flowing through the low-temperature radiator 15). At this time, the low pressure of the heat pump air conditioning system will be at a low level, often lower than the saturation pressure corresponding to 0 degrees Celsius of coolant. If the ambient humidity is high, or if the heat pump air conditioning system runs for a long time, the surface of the low-temperature radiator 15 will gradually frost over, and the heat exchange with the air will gradually decrease, causing the low pressure to drop lower and lower, resulting in a vicious cycle. When the defrost mode is activated, the second water-cooled cooler 3 absorbs heat from the passenger compartment, transfers the heat to the coolant through the water-cooled condenser 20, and causes the coolant to release heat when flowing through the low-temperature radiator 15, thereby achieving the effect of defrosting. When the heat pump air conditioning system detects that defrosting is complete, it switches back to the required mode (e.g., heating mode). This switching cycle can achieve dehumidification and heating effects in low-temperature and high-humidity conditions such as rainy days in winter.

[0065] Of course, in addition to the above modes, various derivative modes can be achieved by adjusting valves such as the first proportional three-way valve 8, the second proportional three-way valve 14, the first five-way regulating valve 11, and the second five-way regulating valve 12.

[0066] like Figure 6 As shown, this heat pump air conditioning system can also achieve self-circulation of heat from the battery pack assembly 10 and heat dissipation from the motor assembly 25, in addition to cooling the passenger compartment. Figure 7 As shown, this heat pump air conditioning system can also passively cool the battery pack assembly 10 and dissipate heat from the motor assembly 25, in addition to cooling the passenger compartment. Figure 8 As shown, this heat pump air conditioning system can also actively cool the battery pack assembly 10, dissipate heat from the motor assembly 25, and dissipate the heat of the entire vehicle to the external environment, in addition to heating and dehumidifying the passenger compartment. Figure 9 As shown, this heat pump air conditioning system can also achieve self-circulation of heat from the battery pack assembly 10, reuse of heat generated from the motor assembly 25, and absorption of heat from the external environment, in addition to heating and dehumidifying the passenger compartment, to meet the heating requirements for dehumidification (which also includes heating the passenger compartment). Figure 10 As shown, the heat pump air conditioning system can also heat the battery pack assembly 10 in addition to heating and dehumidifying the passenger compartment.

[0067] In the description of this specification, references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0068] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A heat pump air conditioning system, characterized in that, It includes a coolant circuit and a refrigerant circuit, wherein the refrigerant circuit includes: Electric compressor (1); The inlet end of the second proportional three-way valve (14) is connected to the high-pressure side of the electric compressor (1); An external condenser (16) is connected to one outlet end of the second proportional three-way valve (14); A bypass line, the inlet of which is connected to the other outlet of the second proportional three-way valve (14); A water-cooled condenser (20) is provided, with its inlet end connected to the outlet end of the external condenser (16) and the outlet end of the bypass pipe, respectively.

2. The heat pump air conditioning system according to claim 1, characterized in that, The refrigerant circuit also includes an electronic refrigerant valve (13), the inlet end of which is connected to the high-pressure side of the electric compressor (1), and the outlet end of which is connected to the low-pressure side of the electric compressor (1).

3. The heat pump air conditioning system according to claim 1, characterized in that, The refrigerant circuit also includes a refrigerant flow channel of a first water-cooled cooler (2), through which the refrigerant can flow through the first water-cooled cooler (2). The coolant circuit includes a first circuit, which includes a coolant flow channel of the first water-cooled cooler (2) and a battery pack assembly (10). The coolant can circulate between the coolant flow channel of the first water-cooled cooler (2) and the battery pack assembly (10). The refrigerant and the coolant can exchange heat when flowing through the first water-cooled cooler (2), and the coolant can absorb or release heat when flowing through the battery pack assembly (10).

4. The heat pump air conditioning system according to claim 3, characterized in that, The refrigerant circuit also includes a refrigerant flow channel of a second water-cooled cooler (3), through which the refrigerant can flow through the second water-cooled cooler (3). The coolant circuit also includes a second circuit, which includes a coolant flow channel of the second water-cooled cooler (3) and a cold core (5), through which the coolant can circulate between the coolant flow channel of the second water-cooled cooler (3) and the cold core (5). The refrigerant and the coolant can exchange heat when flowing through the second water-cooled cooler (3), and the coolant can absorb heat when flowing through the cold core (5).

5. The heat pump air conditioning system according to claim 4, characterized in that, The refrigerant circuit also includes a first throttle valve (22) and a second throttle valve (23). The first throttle valve (22) and the first water-cooled cooler (2) are connected in sequence between the outlet end of the water-cooled condenser (20) and the low-pressure side of the electric compressor (1). The second throttle valve (23) and the second water-cooled cooler (3) are connected in sequence between the outlet end of the water-cooled condenser (20) and the low-pressure side of the electric compressor (1).

6. The heat pump air conditioning system according to claim 4, characterized in that, The water-cooled condenser (20) includes a refrigerant flow channel through which the refrigerant can flow. The coolant circuit also includes a third circuit, which includes the coolant flow channel of the water-cooled condenser (20), a heater core (6), and a low-temperature radiator (15). The coolant can flow between the coolant flow channel of the water-cooled condenser (20), the heater core (6), and the low-temperature radiator (15). The refrigerant and the coolant can exchange heat when flowing through the water-cooled condenser (20), the coolant can release heat when flowing through the heating core (6), and can release heat when flowing through the low-temperature radiator (15).

7. The heat pump air conditioning system according to claim 6, characterized in that, The third circuit also includes a motor assembly (25), which is connected between the low-temperature radiator (15) and the water-cooled condenser (20). The coolant can flow sequentially through the low-temperature radiator (15), the motor assembly (25), and the water-cooled condenser (20).

8. The heat pump air conditioning system according to claim 6, characterized in that, A first proportional three-way valve (8) is connected between the heating element (6) and the low-temperature radiator (15). The first proportional three-way valve (8) is used to adjust the ratio of the flow rate of the coolant through the heating element (6) and the low-temperature radiator (15).

9. The heat pump air conditioning system according to claim 6, characterized in that, The coolant circuit also includes an expansion tank (26).

10. The heat pump air conditioning system according to claim 6, characterized in that, A first five-way regulating valve (11) and a second five-way regulating valve (12) are coupled between the first circuit and the third circuit. The first five-way regulating valve (11) and the second five-way regulating valve (12) are used to adjust the ratio of the flow rate of the coolant through the first circuit and the third circuit.

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