Heat pump air conditioning system

Abstract

The present invention relates to the technical field of thermal management systems, and particularly to a heat pump air-conditioning system. In the heat pump air-conditioning system, the first heat exchanger includes a first interface and a second interface, the second heat exchanger includes a third interface and a fourth interface, and the third heat exchanger includes a first communication port and a second communication port; the reversing assembly is communicated with the outflow end of the power source assembly, and the reversing assembly is respectively connected to the first communication port, the second interface and the third interface; the second interface is communicated with the inflow end of the power source assembly through a first pipeline, and a first valve is provided on the first pipeline, the third interface is communicated with the inflow end of the power source assembly through a second pipeline, and a second valve is provided on the second pipeline; the first interface is communicated with the second communication port, and the fourth interface is communicated with the first communication port; one end of the parallel pipeline is communicated with the first interface, and the other end is communicated with the fourth interface; the second communication port is communicated with the inflow end of the power source assembly through a first branch pipe, and a third valve is provided on the first branch pipe.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal management systems, and more particularly to a heat pump air conditioning system. Background Art

[0002] The heat pump air conditioning system is an important part of new energy vehicles, which greatly affects the driving range of new energy vehicles and the comfort of passengers. Generally, the air conditioning box of the existing heat pump air conditioning system has a two-core structure, that is, it includes an indoor evaporator and an indoor condenser. In a high-temperature environment, the indoor evaporator is used for cooling the passenger compartment, and the indoor condenser is idle. In a low-temperature environment, the indoor condenser is used for heating the passenger compartment, and the indoor evaporator is idle. Due to the limited indoor space of new energy vehicles, the heat exchange area of this existing heat pump air conditioning system is limited, and the heat exchange effect of the heat pump air conditioning system is poor. Summary of the Invention

[0003] The purpose of the present invention is to provide a heat pump air conditioning system to solve, to a certain extent, the technical problem of poor heat exchange of the heat pump air conditioning system in the prior art.

[0004] The present invention provides a heat pump air conditioning system, including: a power source assembly, a commutation assembly, a first heat exchanger, a second heat exchanger, a third heat exchanger, and a parallel pipeline; the first heat exchanger includes a first interface and a second interface, the second heat exchanger includes a third interface and a fourth interface, and the third heat exchanger includes a first communication port and a second communication port; the commutation assembly is connected to the outflow end of the power source assembly, and the commutation assembly is respectively connected to the first communication port, the second interface, and the third interface to connect the power source assembly to the first communication port or to connect the power source assembly to the second interface and the third interface respectively; the second interface is connected to the inflow end of the power source assembly through a first pipeline, and a first valve is provided on the first pipeline; the third interface is connected to the inflow end of the power source assembly through a second pipeline, and a second valve is provided on the second pipeline; the first interface is connected to the second communication port through a third pipeline, and the fourth interface is connected to the first communication port through a fourth pipeline; one end of the parallel pipeline is connected to the first interface, and the other end is connected to the fourth interface; the second communication port is connected to the inflow end of the power source assembly through a first branch pipe, and a third valve is provided on the first branch pipe.

[0005] When refrigeration is required, the commutation assembly connects the outflow end of the power source assembly to the first communication port of the third heat exchanger, and cuts off the communication pipeline between the power source assembly and the second and third interfaces; the first valve and the second valve can be opened (i.e., both the first pipeline and the second pipeline are opened), and the third valve is closed (i.e., the first branch pipe is closed): the medium flows out from the power source assembly into the third heat exchanger. Among the medium flowing out of the third heat exchanger, a part of the medium enters the first heat exchanger through the first interface for heat exchange, and the heat-exchanged medium enters the first pipeline through the second interface and then flows back to the power source assembly. Another part of the medium enters the fourth interface through the parallel pipeline, then enters the second heat exchanger for heat exchange, and the heat-exchanged medium flows into the second pipeline through the third interface and then flows back to the power source assembly, realizing the parallel connection of the first heat exchanger and the second heat exchanger. At this time, both heat exchangers are working, with high refrigeration intensity and high refrigeration efficiency. Of course, the second valve can be selectively closed to close the second pipeline, so that the medium only passes through the first heat exchanger for heat exchange. At this time, the first heat exchanger is used as an evaporator, and general refrigeration can be achieved.

[0006] In the heat pump air-conditioning system provided by the present invention, at least the parallel connection of the first heat exchanger and the second heat exchanger can be realized during the refrigeration process. Both of them are used as evaporators, which can increase the heat exchange area, improve the heat exchange efficiency and improve the heat exchange effect without increasing the number of evaporators.

[0007] Further, the second pipeline is connected to the commutation assembly, and the first pipeline is connected to the second pipeline; the second valve is located between the connection point of the second pipeline and the commutation assembly and the connection point of the first pipeline and the second pipeline, and the first valve is located between the connection point of the first pipeline and the second pipeline and the connection point of the first pipeline and the inflow end of the power source assembly.

[0008] When heating is required, the commutation assembly connects the outflow end of the power source assembly to the second pipeline, opens the second valve, and closes the first valve. At this time, the outflow end of the power source assembly is connected to both the second interface and the third interface, and the third valve is opened: the medium flowing out from the outflow end of the power source assembly enters the second pipeline. A part of the medium enters the second heat exchanger through the third interface and flows out through the fourth interface; another part of the medium enters the first pipeline after passing through the second valve, then enters the first heat exchanger through the second interface for heat exchange and flows out through the first interface, and then enters the parallel pipeline 7. This part of the medium converges with the medium flowing out of the fourth interface and flows towards the first communication port. The medium enters the third heat exchanger for heat exchange and flows out through the second communication port, and then flows towards the first branch pipe and flows back to the power source assembly through the first branch pipe. At this time, both heat exchangers are working, with high heating intensity and high heating efficiency. Of course, the second valve can be selectively closed to cut off the connection between the outflow end of the power source assembly and the second interface. At this time, the medium enters the second heat exchanger for heat exchange and does not enter the first heat exchanger for heat exchange, realizing general heating.

[0009] It is possible to use the first heat exchanger and the second heat exchanger simultaneously as an evaporator and a condenser, increasing the heat exchange area, improving the heat exchange efficiency, and enhancing the heat exchange effect without increasing the number of evaporators and condensers; it is also possible to select the heating intensity, where both the first heat exchanger and the second heat exchanger can exchange heat, or only the second heat exchanger can exchange heat. Moreover, the pipeline structure of the heat pump air-conditioning system can be simplified.

[0010] Further, a first one-way valve is provided on the parallel pipeline, and the first one-way valve prevents the fluid from flowing from the fourth interface side to the first interface side.

[0011] Further, the heat pump air-conditioning system further includes a fourth heat exchanger; the fourth heat exchanger is connected to the first branch pipe.

[0012] Further, both the commutation component and the parallel pipeline communicate with the fourth pipeline; a second one-way valve is connected to the fourth pipeline, and the second one-way valve is located between the connection point of the commutation component and the fourth pipeline and the connection point of the parallel pipeline and the fourth pipeline.

[0013] Further, a fourth valve is further provided on the fourth pipeline; both the first branch pipe and the parallel pipeline communicate with the third pipeline; a fifth valve is provided on the third pipeline.

[0014] Further, the heat pump air-conditioning system further includes a second branch pipe, one end of the second branch pipe communicates with the outflow end of the power source assembly, and the other end communicates with the inflow end of the power source assembly, and a sixth valve is provided on the second branch pipe.

[0015] Further, the commutation component is a three-way solenoid valve.

[0016] Further, the heat pump air-conditioning system further includes a third branch pipe and a fourth branch pipe; the third branch pipe is connected between the outflow end of the power source assembly and the second pipeline, and the fourth branch pipe is connected between the outflow end of the power source assembly and the fourth pipeline; the commutation component includes a first parallel solenoid valve provided on the third branch pipe and a second parallel solenoid valve provided on the fourth branch pipe.

[0017] Further, the second heat exchanger further includes a fifth interface, and the heat pump air-conditioning system further includes a fifth branch pipe, and the fifth branch pipe is connected between the second pipeline and the fifth interface; on the second pipeline, between the connection point of the second pipeline and the fifth branch pipe and the third interface, a seventh valve is provided, and an eighth valve is provided on the fifth branch pipe.

[0018] It should be understood that both the foregoing general description and the following detailed description are for purposes of illustration and example only and do not necessarily limit the present disclosure. The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate the subject matter of the present disclosure. At the same time, the specification and the drawings are used to explain the principles of the present disclosure. Description of the Drawings

[0019] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 Schematic diagram of the heat pump air conditioner system according to the first embodiment of the present invention;

[0021] Figure 2 Schematic diagram of the heat pump air conditioner system according to the second embodiment of the present invention;

[0022] Figure 3 For Figure 2 Operating diagram of the heat pump air conditioner system shown in the refrigeration mode or the refrigeration dual-zone mode;

[0023] Figure 4 For Figure 2 Operating diagram of the heat pump air conditioner system shown in the refrigeration mode and the forced cooling mode of the heating component;

[0024] Figure 5 For Figure 2 Operating diagram of the heat pump air conditioner system shown in the forced cooling mode of the heating component;

[0025] Figure 6 For Figure 2 Operating diagram of the heat pump air conditioner system shown in the heating mode;

[0026] Figure 7 For Figure 2 Operating diagram of the heat pump air conditioner system shown in the self-heating heating mode of the compressor;

[0027] Figure 8 For Figure 2 Operating diagram of the heat pump air conditioner system shown in the dehumidification mode.

[0028] Icons: 1 - Compressor; 2 - Gas - liquid separator; 3 - Third heat exchanger; 301 - First communication port; 302 - Second communication port; 4 - First heat exchanger; 401 - First interface; 402 - Second interface; 5 - Second heat exchanger; 501 - Third interface; 502 - Fourth interface; 503 - Fifth interface; 6 - Fourth heat exchanger; 7 - Parallel pipeline; 8 - First pipeline; 9 - Second pipeline; 10 - First branch pipe; 11 - Third pipeline; 12 - Fourth pipeline; 13 - First check valve; 14 - Second check valve; 15 - Second branch pipe; 16 - Third branch pipe; 17 - Fourth branch pipe; 18 - Fifth branch pipe; 19 - First parallel solenoid valve; 20 - Second parallel solenoid valve; 21 - Third parallel solenoid valve; 22 - Fourth parallel solenoid valve; 23 - First parallel electronic expansion valve; 24 - Second parallel electronic expansion valve; 25 - Third parallel electronic expansion valve; 26 - Fourth parallel electronic expansion valve; 27 - Fifth parallel electronic expansion valve; 28 - Sixth parallel electronic expansion valve; 29 - Blower. Detailed implementation mode

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them.

[0030] Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents the selected embodiments of the present invention.

[0031] All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0032] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third", "fourth", "fifth", "sixth", "seventh", "eighth" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0033] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] It should be noted that the third heat exchanger 3 in the embodiment of the present invention mainly exchanges heat with outdoor air, the first heat exchanger 4 and the second heat exchanger 5 mainly exchange heat with the air inhaled by the blower 29, and the fourth heat exchanger 6 mainly exchanges heat with the cooling medium.

[0035] As Figures 1 to 8 shown, the present invention provides a heat pump air-conditioning system, including a power source assembly, a commutation assembly, a first heat exchanger 4, a second heat exchanger 5, a third heat exchanger 3, and a parallel pipeline 7; the first heat exchanger 4 includes a first interface 401 and a second interface 402, the second heat exchanger 5 includes a third interface 501 and a fourth interface 502, and the third heat exchanger 3 includes a first communication port 301 and a second communication port 302; the commutation assembly is communicated with the outflow end of the power source assembly (i.e., the side where the medium flows out of the power source assembly), and the commutation assembly is respectively connected to the first communication port 301, the second interface 402, and the third interface 501 to communicate the power source assembly with the first communication port 301 or to communicate the power source assembly with the second interface 402 and the third interface 501 respectively; the second interface 402 is communicated with the inflow end of the power source assembly (i.e., the side where the medium flows into the power source assembly) through a first pipeline 8, and a first valve is provided on the first pipeline 8. The third interface 501 is communicated with the inflow end of the power source assembly through a second pipeline 9, and a second valve is provided on the second pipeline 9; the first interface 401 is communicated with the second communication port 302 through a third pipeline 11, and the fourth interface 502 is communicated with the first communication port 301 through a fourth pipeline 12; one end of the parallel pipeline 7 is communicated with the first interface 401, and the other end is communicated with the fourth interface 502; the second communication port 302 is communicated with the inflow end of the power source assembly through a first branch pipe 10, and a third valve is provided on the first branch pipe 10.

[0036] In this embodiment, when refrigeration is required, the commutation assembly connects the outlet end of the power source assembly to the first communication port 301 of the third heat exchanger 3, and cuts off the communication pipeline between the power source assembly and the second interface 402 and the third interface 501; the first valve and the second valve can be opened (that is, both the first pipeline 8 and the second pipeline 9 are opened), and the third valve is closed (that is, the first branch pipe 10 is closed): the medium flows out from the power source assembly into the third heat exchanger 3. Among the medium flowing out of the third heat exchanger 3, a part of the medium enters the first heat exchanger 4 through the first interface 401 for heat exchange, and the heat-exchanged medium enters the first pipeline 8 through the second interface 402, and then flows back to the power source assembly. Another part of the medium enters the fourth interface 502 through the parallel pipeline 7, then enters the second heat exchanger 5 for heat exchange, and the heat-exchanged medium flows into the second pipeline 9 through the third interface 501, and then flows back to the power source assembly, realizing the parallel connection of the first heat exchanger 4 and the second heat exchanger 5. At this time, both heat exchangers are working, with high refrigeration intensity and high refrigeration efficiency. Of course, the second valve can be selectively closed, so as to close the second pipeline 9, so that the medium only passes through the first heat exchanger 4 for heat exchange. At this time, the first heat exchanger 4 is used as an evaporator, and general refrigeration can be achieved.

[0037] In the heat pump air-conditioning system provided in this embodiment, at least the parallel connection of the first heat exchanger 4 and the second heat exchanger 5 can be realized during the refrigeration process. Both of them are used as evaporators. Without increasing the number of evaporators, the heat exchange area can be increased, the heat exchange efficiency can be improved, and the heat exchange effect can be improved.

[0038] Among them, independent pipelines can be set to realize the connection of the commutation assembly to the first interface 401 and the second interface 402 respectively. The first pipeline 8 and the second pipeline 9 are independent of each other. At this time, when heating is required, the commutation assembly connects the outlet end of the power source assembly to the second interface 402 and the third interface 501 respectively. The first valve is closed, and the second valve and the third valve are both opened. The medium flowing out of the outlet end of the power source assembly: a part of the medium enters the second heat exchanger 5 through the third interface 501 and flows out through the fourth interface 502; another part of the medium enters the first heat exchanger 4 through the second interface 402 and flows out through the first interface 401, and then enters the parallel pipeline 7. This part of the medium converges with the medium flowing out of the fourth interface 502 and flows towards the first communication port 301. The medium enters the third heat exchanger 3 for heat exchange and flows out through the second communication port 302, and then flows towards the first branch pipe 10 and flows back to the power source assembly through the first branch pipe 10. At this time, both heat exchangers work as condensers, with high heating intensity and high heating efficiency.

[0039] In the heat pump air-conditioning system provided in this embodiment, the first heat exchanger 4 and the second heat exchanger 5 can be used as condensers and evaporators, and without increasing the number of evaporators and condensers, the heat exchange area can be increased, the heat exchange efficiency can be improved, and the heat exchange effect can be improved.

[0040] As an alternative, as Figures 1 to 8 shown, the second pipeline 9 is connected to the commutation component, and the first pipeline 8 is connected to the second pipeline 9 (that is, the second pipeline 9 is connected to the inflow end of the power source component through the first pipeline 8, and the first pipeline 8 is connected to the commutation component through the second pipeline 9); the second valve is located between the connection point of the second pipeline 9 and the commutation component and the connection point of the first pipeline 8 and the second pipeline 9, and the first valve is located between the connection point of the first pipeline 8 and the second pipeline 9 and the connection point of the first pipeline 8 and the inflow end of the power source component.

[0041] In this embodiment, the refrigeration process is the same as the above process and will not be elaborated here. The second interface 402 is connected to the commutation component through the first pipeline 8 and the second pipeline 9, and the third interface 501 is connected to the inflow end of the power source component through the second pipeline 9 and the first pipeline 8, which can avoid setting other pipelines and make the pipeline structure of the heat pump air-conditioning system simple. When heating is required, the commutation component connects the outflow end of the power source component to the second pipeline 9, opens the second valve, and closes the first valve. At this time, the outflow end of the power source component is connected to both the second interface 402 and the third interface 501, and the third valve is opened: the medium flowing out of the outflow end of the power source component enters the second pipeline 9, a part of the medium enters the second heat exchanger 5 through the third interface 501, is heated, and then flows out through the fourth interface 502; another part of the medium enters the first pipeline 8 after passing through the second valve, then enters the first heat exchanger 4 through the second interface 402, is heated, and then flows out through the first interface 401, and then enters the parallel pipeline 7. This part of the medium converges with the medium flowing out of the fourth interface 502 and flows towards the first communication port 301. The medium enters the third heat exchanger 3, is heated, and then flows out through the second communication port 302, and flows towards the first branch pipe 10, and flows back to the power source component through the first branch pipe 10. At this time, both heat exchangers are working, and the heating intensity is high and the heating efficiency is high. Of course, the second valve can be selectively closed to cut off the connection between the outflow end of the power source component and the second interface 402. At this time, the medium enters the second heat exchanger 5 for heat exchange and does not enter the first heat exchanger 4 for heat exchange, realizing general heating.

[0042] The heat pump air-conditioning system provided in this embodiment can enable the first heat exchanger 4 and the second heat exchanger 5 to be used as both an evaporator and a condenser at the same time. Without increasing the number of evaporators and condensers, the heat exchange area is increased, the heat exchange efficiency is improved, and the heat exchange effect is improved; the heating intensity can also be selected. The first heat exchanger 4 and the second heat exchanger 5 can both perform heat exchange, or the second heat exchanger 5 can perform heat exchange. Moreover, the pipeline structure of the heat pump air-conditioning system can be simplified.

[0043] Elements for detecting the pressure and temperature of the medium can also be provided in the heat pump air-conditioning system.

[0044] As Figures 1 to 8As shown in the figure, on the basis of the above embodiments, further, a first one-way valve 13 is provided on the parallel pipeline 7. The first one-way valve 13 prevents the fluid from flowing from the fourth interface 502 side to the first interface 401 side, avoiding the reverse flow of the medium and ensuring the control effect of the fluid flow direction.

[0045] As Figures 1 to 8 shown in the figure, on the basis of the above embodiments, further, the heat pump air-conditioning system further includes a fourth heat exchanger 6. The fourth heat exchanger 6 is connected to the first branch pipe 10. Specifically, the third valve is connected to the first branch pipe 10 and is located between the fourth heat exchanger 6 and the connection point of the third pipeline 11 and the first branch pipe 10.

[0046] In this embodiment, setting the fourth heat exchanger 6 can cool the heating components on the vehicle (such as batteries or generators, etc.) or recover the waste heat of the heating components for heating.

[0047] As Figures 1 to 8 shown in the figure, on the basis of the above embodiments, further, both the commutation assembly and the parallel pipeline 7 are connected to the fourth pipeline 12; a second one-way valve 14 is connected to the fourth pipeline 12. The second one-way valve 14 is located between the connection point of the commutation assembly and the fourth pipeline 12 and the connection point of the parallel pipeline 7 and the fourth pipeline 12. The second one-way valve 14 prevents the medium from flowing in the direction from the connection point of the commutation assembly and the fourth pipeline 12 to the connection point of the parallel pipeline 7 and the fourth pipeline 12 and in the direction of the second heat exchanger 5.

[0048] As Figures 1 to 8 shown in the figure, on the basis of the above embodiments, further, a fourth valve is further provided on the fourth pipeline 12; both the first branch pipe 10 and the parallel pipeline 7 are connected to the third pipeline 11; a fifth valve is provided on the third pipeline 11. This is beneficial for the heat pump air-conditioning system to achieve more working modes, and the specific applications will be described in detail in the following specific examples.

[0049] As Figures 1 to 8 shown in the figure, on the basis of the above embodiments, further, the heat pump air-conditioning system further includes a second branch pipe 15. One end of the second branch pipe 15 is connected to the outflow end of the power source assembly, and the other end is connected to the inflow end of the power source assembly. A sixth valve is provided on the second branch pipe 15. This setting is beneficial for the heat pump air-conditioning system to achieve more working modes, and the specific applications will be described in detail in the following specific examples.

[0050] As an alternative solution, the commutation assembly can be a three-way solenoid valve. Using an integrated solenoid valve can make the pipeline structure of the heat pump air-conditioning system simple.

[0051] As an alternative, the heat pump air-conditioning system further includes a third branch pipe 16 and a fourth branch pipe 17; the third branch pipe 16 is connected between the outflow end of the power source assembly and the second pipeline 9, and the fourth branch pipe 17 is connected between the outflow end of the power source assembly and the fourth pipeline 12; the commutation assembly includes a first parallel solenoid valve 19 provided on the third branch pipe 16 and a second parallel solenoid valve 20 provided on the fourth branch pipe 17. In this embodiment, when it is necessary to connect the outflow end of the power source assembly to the third heat exchanger 3, the second parallel solenoid valve 20 is opened and the first parallel solenoid valve 19 is closed; when it is necessary to connect the outflow end of the power source assembly to the second pipeline 9, the second parallel solenoid valve 20 is closed and the first parallel solenoid valve 19 is opened. Using a solenoid valve to achieve commutation control can reduce the cost of the commutation assembly.

[0052] As Figures 2 to 8 shown, on the basis of the above embodiment, further, the second heat exchanger 5 further includes a fifth interface 503, and the heat pump air-conditioning system further includes a fifth branch pipe 18, and the fifth branch pipe 18 is connected between the second pipeline 9 and the fifth interface 503; a seventh valve is provided between the connection point of the second pipeline 9 and the fifth branch pipe 18 and the third interface 501, and an eighth valve is provided on the fifth branch pipe 18.

[0053] In this embodiment, the flow rate of the first medium entering the second heat exchanger 5 can be controlled by the seventh valve and the eighth valve, so that the dual-temperature zone function can be realized, the temperature air door can be avoided, and the production cost can be reduced.

[0054] The first valve, the second valve, the third valve, the fourth valve, the fifth valve, the sixth valve, the seventh valve and the eighth valve can all adopt electric valves, etc.

[0055] Specifically, in some embodiments of the present invention, the first valve and the second valve can play the role of opening and closing. Optionally, the first valve is a third parallel solenoid valve 21, and the second valve is a fourth parallel solenoid valve 22; the third valve, the fourth valve, the fifth valve, the sixth valve, the seventh valve and the eighth valve can play the role of regulating the flow rate, and preferably all adopt parallel electronic expansion valves, that is, the first parallel electronic expansion valve 23, the second parallel electronic expansion valve 24, the third parallel electronic expansion valve 25, the fourth parallel electronic expansion valve 26, the fifth parallel electronic expansion valve 27 and the sixth parallel electronic expansion valve 28 respectively.

[0056] Specifically, the power source assembly includes a compressor 1 and a gas-liquid separator 2. The inlet end of the gas-liquid separator 2 is the inflow end of the power source assembly, the outlet end of the compressor 1 is the outflow end of the power source assembly, and the outlet end of the gas-liquid separator 2 is connected to the inlet end of the compressor 1. The gas-liquid separator 2 can be a casing type or a U-tube type, and the structure is not limited. It mainly plays the roles of separating liquid refrigerant and gaseous refrigerant, storing liquid, returning oil, drying, filtering, etc., and can prevent the compressor 1 from lacking oil and wet compression.

[0057] Specifically, a blower 29 is arranged on one side of the first heat exchanger 4, so that the air at the first heat exchanger 4 and the second heat exchanger 5 can be blown into the passenger compartment.

[0058] The following takes the commutation assembly including the first parallel solenoid valve 19 and the second parallel solenoid valve 20, and an embodiment including other technical features of the embodiment (as Figure 2 shown) to specifically illustrate the working process of the heat pump air conditioning system under different working modes:

[0059] As Figure 3 shown, the refrigeration mode of the heat pump air conditioning system:

[0060] The first parallel solenoid valve 19 is closed, and the second parallel solenoid valve 20, the third parallel solenoid valve 21, and the fourth parallel solenoid valve 22 are opened; the first parallel electronic expansion valve 23 and the fourth parallel electronic expansion valve 26 are both closed, and the second parallel electronic expansion valve 24, the third parallel electronic expansion valve 25, the fifth parallel electronic expansion valve 27, and the sixth parallel electronic expansion valve 28 are all opened, and the blower 29 is opened. The compressor 1 discharges high-temperature and high-pressure refrigerant, which flows into the third heat exchanger 3 through the second parallel solenoid valve 20 and the second parallel electronic expansion valve 24. At this time, the second parallel electronic expansion valve 24 is fully opened. After the refrigerant condenses and releases heat in the third heat exchanger 3, it is throttled by the third parallel electronic expansion valve and branched into two paths. One path flows into the first heat exchanger 4 through the first interface 401 to absorb the air heat, and then flows out from the second interface 402; the other path flows into the second heat exchanger 5 through the first check valve 13 from the fourth interface 502 to absorb the air heat, and then flows out from the third interface 501 and the fifth interface 503 respectively, and then passes through the fifth parallel electronic expansion valve 27, the sixth parallel electronic expansion valve 28, and the fourth parallel solenoid valve 22 to converge with the refrigerant flowing out from the second interface 402 and flow into the third parallel solenoid valve 21 together, and then enters the gas-liquid separator 2. At this time, both the fifth parallel electronic expansion valve 27 and the sixth parallel electronic expansion valve 28 are fully opened. The refrigerant is gas-liquid separated and dried in the gas-liquid separator 2 and then flows into the compressor 1, thus completing the refrigerant refrigeration mode cycle. The blower 29 inhales air and blows it into the passenger compartment after heat exchange through the first heat exchanger 4 and the second heat exchanger 5 in turn, realizing the refrigeration of the passenger compartment.

[0061] When operating in the refrigeration mode, the fourth parallel solenoid valve 22, the fifth parallel electronic expansion valve 27, and the sixth parallel electronic expansion valve 28 can also be all closed, that is, controlling the refrigerant not to flow in the second heat exchanger 5 and exchange heat with the air. The other flow modes of the refrigerant are the same as the above flow process and will not be elaborated here.

[0062] When operating in the dual-temperature zone refrigeration mode, it is only necessary to regulate the opening degrees of the fifth parallel electronic expansion valve 27 and the sixth parallel electronic expansion valve 28. Open one of the fifth parallel electronic expansion valve 27 and the sixth parallel electronic expansion valve 28, or both the fifth parallel electronic expansion valve 27 and the sixth parallel electronic expansion valve 28 are opened, but with different opening degrees, that is, to control the heat exchange amount between the refrigerant and the air by controlling the flow rate flowing out of the two cores of the second heat exchanger 5. The other flow modes of the refrigerant are the same as those in the high-temperature refrigeration mode flow process, which will not be elaborated here.

[0063] As Figure 4 shown, the refrigeration mode and the forced cooling mode of the heating component of the heat pump air-conditioning system:

[0064] In the refrigeration mode, when the temperature of the heating component exceeds its own safety requirement temperature, it is necessary to cool the heating component. The first parallel solenoid valve 19 is closed, and the second parallel solenoid valve 20, the third parallel solenoid valve 21, and the fourth parallel solenoid valve 22 are all opened; the fourth parallel electronic expansion valve 26 is closed, and the first parallel electronic expansion valve 23, the second parallel electronic expansion valve 24, the third parallel electronic expansion valve 25, the fifth parallel electronic expansion valve 27, and the sixth parallel electronic expansion valve 28 are all opened; the blower 29 is opened. The compressor 1 discharges high-temperature and high-pressure refrigerant, which flows into the third heat exchanger 3 through the second parallel solenoid valve 20 and the second parallel electronic expansion valve 24. At this time, the second parallel electronic expansion valve 24 is fully opened. After the refrigerant condenses and releases heat in the third heat exchanger 3, it branches into two paths. One path flows through the first parallel electronic expansion valve 23 and throttles into the fourth heat exchanger 6. At this time, the refrigerant evaporates and absorbs heat in the fourth heat exchanger 6, and then flows out to the gas-liquid separator 2; the other path flows into the third parallel electronic expansion valve 25 and throttles. After throttling, the refrigerant branches into two paths again. One path flows through the first interface 401 into the first heat exchanger 4 to absorb the heat of the air, and then flows out from the second interface 402. The other path flows through the first check valve 13 from the fourth interface 502 into the second heat exchanger 5 to continue absorbing the heat of the air, and then flows out from the third interface 501 and the fifth interface 503 respectively, passes through the fifth parallel electronic expansion valve 27 and the sixth parallel electronic expansion valve 28, and then passes through the fourth parallel solenoid valve 22 to converge with the refrigerant flowing out from the second interface 402 and flows into the third parallel solenoid valve 21 and the gas-liquid separator 2 together. At this time, both the fifth parallel electronic expansion valve 27 and the sixth parallel electronic expansion valve 28 can be fully opened. The refrigerant is separated and dried in the gas-liquid separator 2 and then flows into the compressor 1 to complete the cycle of the refrigerant refrigeration mode and the forced cooling mode of the heating component. The blower 29 inhales the air in the environment, passes through the first heat exchanger 4 and the second heat exchanger 5 in turn for heat exchange, and then blows into the passenger compartment to realize the refrigeration of the passenger compartment.

[0065] As Figure 5 shown, the forced cooling mode of the heating component of the heat pump air-conditioning system:

[0066] There is no refrigeration demand in the passenger compartment. When the temperature of the heating components exceeds their own safety requirements, it is necessary to cool the heating components. At this time, the second parallel solenoid valve 20 can be opened, and the first parallel solenoid valve 19, the third parallel solenoid valve 21, and the fourth parallel solenoid valve 22 are all closed; the third parallel electronic expansion valve 25, the fourth parallel electronic expansion valve 26, the fifth parallel electronic expansion valve 27, and the sixth parallel electronic expansion valve 28 are all closed, the first parallel electronic expansion valve 23 and the second parallel electronic expansion valve 24 are both opened, and the blower 29 is closed. The compressor 1 discharges high-temperature and high-pressure refrigerant, which flows into the third heat exchanger 3 after passing through the second parallel solenoid valve 20 and the second parallel electronic expansion valve 24. At this time, the second parallel electronic expansion valve 24 is fully opened. After the refrigerant condenses and releases heat in the third heat exchanger 3, it throttles through the first parallel electronic expansion valve 23 and flows into the fourth heat exchanger 6. At this time, the refrigerant evaporates and absorbs heat in the fourth heat exchanger 6, and then flows out to the gas-liquid separator 2. The refrigerant is separated and dried in the gas-liquid separator 2 and then flows into the compressor 1 to complete the forced cooling mode cycle of the heating components.

[0067] As Figure 6 shown, the heating mode of the heat pump air conditioning system:

[0068] The first parallel solenoid valve 19 and the fourth parallel solenoid valve 22 are opened, the second parallel solenoid valve 20 and the third parallel solenoid valve 21 are closed, the third parallel electronic expansion valve 25 and the fourth parallel electronic expansion valve 26 are both closed, and the first parallel electronic expansion valve 23, the second parallel electronic expansion valve 24, the fifth parallel electronic expansion valve 27 and the sixth parallel electronic expansion valve 28 are all opened; the blower 29 is opened. The compressor 1 discharges high-temperature and high-pressure refrigerant, which branches into two paths after passing through the first parallel solenoid valve 19. One path flows through the fifth parallel electronic expansion valve 27 and the sixth parallel electronic expansion valve 28 respectively, and then flows into the second heat exchanger 5 through the corresponding third interface 501 and fifth interface 503 to condense and release heat. Both the fifth parallel electronic expansion valve 27 and the sixth parallel electronic expansion valve 28 can adjust the flow rate. When both are fully opened, it is for heating the single-temperature zone of the passenger compartment. When the flow rate is distributed through control adjustment, dual-temperature zone heating of the passenger compartment can be achieved; the other path passes through the fourth parallel solenoid valve 22 and then flows into the first heat exchanger 4 through the second interface 402 to condense and release heat. After releasing heat, the refrigerant flows out through the first interface 401, and then converges with the refrigerant that flows out through the fourth interface 502 after passing through the first check valve 13 and flows into the second check valve 14 together, and then throttles through the second parallel electronic expansion valve 24. The refrigerant evaporates and absorbs heat in the third heat exchanger 3 and then flows into the first parallel electronic expansion valve 23, the fourth heat exchanger 6 and the gas-liquid separator 2 in sequence. At this time, the first parallel electronic expansion valve 23 is fully opened, there is no coolant flow in the fourth heat exchanger 6, and the refrigerant does not exchange heat in the fourth heat exchanger 6. The fourth heat exchanger 6 is equivalent to a connecting channel. The refrigerant is separated, dried in the gas-liquid separator 2 and then flows into the compressor 1 to complete the refrigerant heating mode cycle. The blower 29 inhales the air in the environment, exchanges heat through the first heat exchanger 4 and the second heat exchanger 5 in sequence, and then blows it into the passenger compartment to achieve heating of the passenger compartment.

[0069] In the heating mode of the passenger compartment, if there is waste heat in the heating component that can be recycled, the refrigerant evaporates and absorbs heat in the third heat exchanger 3 and then flows into the first parallel electronic expansion valve 23 and the fourth heat exchanger 6 in sequence. At this time, the first parallel electronic expansion valve 23 throttles, and the refrigerant in the fourth heat exchanger 6 exchanges heat with the waste heat and absorbs the waste heat, and then flows out to the gas-liquid separator 2 and the compressor 1 to complete the waste heat recovery mode of the heating component.

[0070] When the heating mode is running, the fourth parallel solenoid valve 22 can also be closed, that is, control the refrigerant not to flow into the first heat exchanger 4 to flow and exchange heat with the air. The refrigerant flows out from the exhaust port of the compressor 1, passes through the first parallel solenoid valve 19, and then passes through the fifth parallel electronic expansion valve 27 and the sixth parallel electronic expansion valve 28 respectively, and directly flows into the second heat exchanger 5 through the corresponding third interface 501 and fifth interface 503. Other flow modes are the same as the above flow process and will not be elaborated here one by one.

[0071] Such as Figure 7As shown, the self-heating heating mode of the compressor 1 of the heat pump air-conditioning system:

[0072] In a lower temperature environment, when the vehicle is cold-started and the passenger compartment is heated, the vehicle's heat pump air-conditioning system will switch to the self-heating heating mode of the passenger compartment by the compressor 1, leading the gaseous refrigerant at the outlet of the compressor 1 to the inlet of the gas-liquid separator 2 to increase the suction density, thereby improving the heating capacity of the heat pump air-conditioning system.

[0073] At this time, the first parallel solenoid valve 19 and the fourth parallel solenoid valve 22 can be opened, and the second parallel solenoid valve 20 and the third parallel solenoid valve 21 can be closed; the third parallel electronic expansion valve 25 is closed, and the first parallel electronic expansion valve 23, the second parallel electronic expansion valve 24, the fourth parallel electronic expansion valve 26, the fifth parallel electronic expansion valve 27, and the sixth parallel electronic expansion valve 28 are all opened; the blower 29 is opened. The high-temperature and high-pressure refrigerant discharged from the compressor 1 branches into two paths. One path flows into the gas-liquid separator 2 through the fourth parallel electronic expansion valve 26; the other path flows into the first parallel solenoid valve 19. After the refrigerant flows out of the first parallel solenoid valve 19, it branches into two paths again. One path flows through the fifth parallel electronic expansion valve 27 and the sixth parallel electronic expansion valve 28 respectively, and then flows into the second heat exchanger 5 through the corresponding third interface 501 and the fifth interface 503 to condense and release heat. Both the fifth parallel electronic expansion valve 27 and the sixth parallel electronic expansion valve 28 can adjust the flow rate. When both are fully opened, it is for heating the single temperature zone of the passenger compartment. When the flow rate is distributed by controlling and adjusting the two, the dual temperature zone heating of the passenger compartment can be realized; the other path flows through the fourth parallel solenoid valve 22 and then flows into the first heat exchanger 4 through the second interface 402 to condense and release heat. After releasing heat, the refrigerant flows out through the first interface 401, then flows through the first one-way valve 13, converges with the refrigerant flowing out from the fourth interface 502, and then flows through the second one-way valve 14, and then passes through the second parallel electronic expansion valve 24 and the third heat exchanger 3. The refrigerant does not exchange heat in the third heat exchanger 3 and directly flows out to the first parallel electronic expansion valve 23, and then enters the fourth heat exchanger 6 and the gas-liquid separator 2. At this time, the first parallel electronic expansion valve 23 is fully opened, there is no coolant flow in the fourth heat exchanger 6, and the refrigerant does not exchange heat in the fourth heat exchanger 6. This circuit is equivalent to a connection channel. The refrigerant is separated, dried in the gas-liquid separator 2 and then flows into the suction port of the compressor 1 to complete the cycle of the self-heating heating mode of the passenger compartment by the compressor 1. The blower 29 inhales the air in the environment, passes through the first heat exchanger 4 and the second heat exchanger 5 in turn for heat exchange, and then blows into the passenger compartment to realize heating of the passenger compartment.

[0074] As Figure 8 shown, the dehumidification mode of the heat pump air-conditioning system:

[0075] When the humidity in the crew cabin is too high, dehumidification of the crew cabin is required. The second parallel solenoid valve 20 and the fourth parallel solenoid valve 22 can be closed, and the first parallel solenoid valve 19 and the third parallel solenoid valve 21 can be opened; the first parallel electronic expansion valve 23 and the fourth parallel electronic expansion valve 26 can be closed, and the second parallel electronic expansion valve 24, the third parallel electronic expansion valve 25, the fifth parallel electronic expansion valve 27, and the sixth parallel electronic expansion valve 28 can be opened, and the blower 29 can be turned on. After the compressor 1 discharges high-temperature and high-pressure refrigerant and passes through the first parallel solenoid valve 19, it respectively passes through the fifth parallel electronic expansion valve 27 and the sixth parallel electronic expansion valve 28 and then flows into the second heat exchanger 5 through the corresponding third interface 501 and fifth interface 503. After the refrigerant condenses and releases heat in the second heat exchanger 5, it flows out through the fourth interface 502, and then passes through the second one-way valve 14 and the second parallel electronic expansion valve 24 and flows into the third heat exchanger 3. At this time, the second parallel electronic expansion valve 24 throttles. The refrigerant can condense and release heat or evaporate and absorb heat in the third heat exchanger 3, which specifically depends on the ambient temperature and the opening degree of the second parallel electronic expansion valve 24 determined by logical control. Then it passes through the third parallel electronic expansion valve 25 and flows into the first heat exchanger 4 through the first interface 401. It absorbs the heat of the air in the first heat exchanger 4 to reduce the air humidity and flows out through the second interface 402, and then successively passes through the third parallel solenoid valve 21 and the gas-liquid separator 2 and flows into the compressor 1. The wet air inhaled by the blower 29 from the crew cabin is cooled and dehumidified by the first heat exchanger 4, and then absorbs heat and warms up through the second heat exchanger 5 to maintain the comfort of the crew cabin. Through such a cycle, dehumidification of the crew cabin is achieved.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention. In the specification provided here, a large number of specific details are described. However, it can be understood that the embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures, and technologies are not shown in detail so as not to obscure the understanding of this specification. In addition, those skilled in the art can understand that although some embodiments described herein include some features included in other embodiments but not other features, the combination of the features of different embodiments means that it is within the scope of the present invention and forms different embodiments.

Claims

1. A heat pump air conditioning system, characterized in that, Comprising: A power source assembly, a commutation assembly, a first heat exchanger (4), a second heat exchanger (5), a third heat exchanger (3), and a parallel pipeline (7); the first heat exchanger (4) includes a first interface (401) and a second interface (402), the second heat exchanger (5) includes a third interface (501) and a fourth interface (502), and the third heat exchanger (3) includes a first communication port (301) and a second communication port (302); The commutation assembly is communicated with the outflow end of the power source assembly, and the commutation assembly is respectively connected to the first communication port (301), the second interface (402), and the third interface (501) to communicate the power source assembly with the first communication port (301) or to communicate the power source assembly with the second interface (402) and the third interface (501) respectively; The second interface (402) is communicated with the inflow end of the power source assembly through a first pipeline (8), a first valve is provided on the first pipeline (8), the third interface (501) is communicated with the inflow end of the power source assembly through a second pipeline (9), and a second valve is provided on the second pipeline (9); The first interface (401) is communicated with the second communication port (302) through a third pipeline (11), and the fourth interface (502) is communicated with the first communication port (301) through a fourth pipeline (12); one end of the parallel pipeline (7) is communicated with the first interface (401), and the other end is communicated with the fourth interface (502); The second communication port (302) is communicated with the inflow end of the power source assembly through a first branch pipe (10), and a third valve is provided on the first branch pipe (10); The second pipeline (9) is communicated with the commutation assembly, and the first pipeline (8) is communicated with the second pipeline (9); the second valve is located between the connection point of the second pipeline (9) and the commutation assembly and the connection point of the first pipeline (8) and the second pipeline (9), and the first valve is located between the connection point of the first pipeline (8) and the second pipeline (9) and the connection point of the first pipeline (8) and the inflow end of the power source assembly; Both the commutation assembly and the parallel pipeline (7) are communicated with the fourth pipeline (12); a second check valve (14) is connected to the fourth pipeline (12), and the second check valve (14) is located between the connection point of the commutation assembly and the fourth pipeline (12) and the connection point of the parallel pipeline (7) and the fourth pipeline (12); The heat pump air conditioning system further includes a second branch pipe (15), one end of the second branch pipe (15) is communicated with the outflow end of the power source assembly, the other end is communicated with the inflow end of the power source assembly, and a sixth valve is provided on the second branch pipe (15); The heat pump air conditioning system further includes a third branch pipe (16) and a fourth branch pipe (17); the third branch pipe (16) is connected between the outflow end of the power source assembly and the second pipeline (9), and the fourth branch pipe (17) is connected between the outflow end of the power source assembly and the fourth pipeline (12); the commutation assembly includes a first parallel solenoid valve (19) provided on the third branch pipe (16) and a second parallel solenoid valve (20) provided on the fourth branch pipe (17).

2. The heat pump air-conditioning system according to claim 1, wherein A first check valve (13) is provided on the parallel pipeline (7), and the first check valve (13) prevents the fluid from flowing from the side of the fourth interface (502) to the side of the first interface (401).

3. The heat pump air conditioning system according to claim 1, characterized in that The heat pump air conditioning system further includes a fourth heat exchanger (6); the fourth heat exchanger is connected to the first branch pipe (10).

4. The heat pump air conditioning system according to claim 1, characterized in that, A fourth valve is further provided on the fourth pipeline (12); both the first branch pipe (10) and the parallel pipeline (7) are connected to the third pipeline (11); a fifth valve is provided on the third pipeline (11).

5. The heat pump air conditioning system according to claim 1, characterized in that, The commutation assembly is a three-way solenoid valve.

6. The heat pump air-conditioning system according to any one of claims 1-5, characterized in that, The second heat exchanger (5) further includes a fifth interface (503), the heat pump air conditioning system further includes a fifth branch pipe (18), and the fifth branch pipe (18) is connected between the second pipeline (9) and the fifth interface (503); on the second pipeline (9), between the connection point of the second pipeline (9) and the fifth branch pipe (18) and the third interface (501), a seventh valve is provided, and an eighth valve is provided on the fifth branch pipe (18).

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