Heat pump air conditioning system
By using a combination of a compressor, a four-way valve, a heat exchanger, and a throttling device in a CO2 heat pump air-conditioning system, the high cost and poor stability problems caused by the liquid reservoir are solved, and refrigerant demand regulation without a liquid reservoir is achieved, reducing costs and improving stability, while using CO2 as an environmentally friendly refrigerant.
Patent Information
- Application Number
- CN202410362502.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-27
- Publication Date
- 2025-10-10
AI Technical Summary
Existing CO2 heat pump air conditioning systems require additional liquid storage devices, which results in high costs and poor stability.
A heat pump air-conditioning system consisting of a compressor, a four-way valve, first and second heat exchangers, an ejector, a gas-liquid separator, first and second throttling devices, a heat exchange flow path and branches, etc., adjusts the refrigerant demand by combining the heat exchangers in different modes without the need for an additional liquid reservoir.
It reduces system costs, simplifies settings, improves operational stability, and uses CO2 as a refrigerant, which poses no environmental hazards and provides outstanding heating performance.
Smart Images
Figure CN120760342A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of air conditioning, in particular to a heat pump air conditioning system. BACKGROUND
[0002] The heat pump air conditioning water system is a system for heating or cooling by using the heat pump principle. Generally, the heat pump air conditioning water system includes a refrigerant circulation system and a water circulation system. The refrigerant circulation system can realize heating or cooling, and the water circulation system can transfer the heat or cold generated in the refrigerant circulation system to the indoor.
[0003] The heat exchanger in the refrigerant circulation system is generally composed of an air-cooled heat exchanger and a liquid-cooled heat exchanger. The refrigerant circulation amount required by the refrigerant circulation system is different in heating and cooling modes. For example, when the liquid-cooled heat exchanger is used as an evaporator, the system requires relatively more refrigerant, and when the liquid-cooled heat exchanger is used as a condenser, the system requires relatively less refrigerant. At this time, an additional liquid accumulator needs to be set to control the amount of refrigerant in the system, which not only increases the cost, but also increases the complexity of the air conditioning system due to the setting of the liquid accumulator, thereby affecting the stability of the air conditioning system.
[0004] Therefore, there is a need in the art to solve the above problems by a new technical solution. SUMMARY
[0005] In order to solve at least one of the above problems in the prior art, that is, to solve the problem of high cost and poor stability caused by the additional setting of the liquid accumulator in the existing CO2 heat pump air conditioning system, the present application provides a heat pump air conditioning system, which comprises:
[0006] a compressor;
[0007] a four-way valve, a first interface of the four-way valve being in communication with a discharge port of the compressor, and a third interface of the four-way valve being in communication with a suction port of the compressor;
[0008] a first heat exchanger, a first port of the first heat exchanger being in communication with a second interface of the four-way valve;
[0009] an ejector, an air inlet of the ejector being in communication with a second port of the first heat exchanger;
[0010] a second heat exchanger, a first inlet of the second heat exchanger being in communication with an air outlet of the ejector;
[0011] a gas-liquid separator, an air inlet of the gas-liquid separator being in communication with a first outlet of the second heat exchanger, and an air outlet of the gas-liquid separator being in communication with a fourth interface of the four-way valve;
[0012] A first throttling device, a first port of the first throttling device being in communication with the liquid outlet of the gas-liquid separator;
[0013] A third heat exchanger, a first inlet of the third heat exchanger being in communication with the second port of the first throttling device, and a first outlet of the third heat exchanger being in communication with the suction port of the ejector;
[0014] A second throttling device, a first port of the second throttling device being in communication with the first outlet of the third heat exchanger, and a second port of the second throttling device being in communication with the second port of the first heat exchanger;
[0015] A heat exchange flow path, a liquid inlet end of the heat exchange flow path being in communication with the second inlet of the second heat exchanger, a second outlet of the second heat exchanger being in communication with the second inlet of the third heat exchanger, and a liquid outlet end of the heat exchange flow path being in communication with the second outlet of the third heat exchanger.
[0016] In the above technical solution, when the air conditioning system is in different modes, the number of heat exchangers in the system is different. For example, in the refrigeration mode, both the second heat exchanger and the third heat exchanger are in refrigeration cycle, and the demand for refrigerant is greater. The liquid refrigerant in the gas-liquid separator can be fully mobilized. In the heating mode, only the third heat exchanger is in the heating cycle, and the demand for refrigerant is smaller. The excess refrigerant can be stored in the gas-liquid separator. Therefore, the demand for refrigerant can be adjusted without the need for an additional liquid accumulator, thereby reducing costs, simplifying system settings, and improving the stability of the system.
[0017] In the above preferred technical solution of the heat pump air conditioning system, the heat pump air conditioning system further comprises a first branch, a first end of the first branch being in communication with the liquid inlet end of the heat exchange flow path, and a second end of the first branch being in communication with the second inlet of the third heat exchanger.
[0018] In the above preferred technical solution of the heat pump air conditioning system, a three-way valve is further arranged on the heat exchange flow path, a first interface, a second interface and a third interface of the three-way valve being in communication with the liquid inlet end of the heat exchange flow path, the first end of the first branch and the second inlet of the second heat exchanger, respectively.
[0019] In the above preferred technical solution of the heat pump air conditioning system, a first valve body is further arranged on the heat exchange flow path,
[0020] The first valve body is located between the second outlet of the second heat exchanger and the second inlet of the third heat exchanger,
[0021] The second end of the first branch is in communication with the heat exchange flow path between the downstream of the first valve body and the second inlet of the third heat exchanger.
[0022] When the above technical solution is adopted, when the system is in cooling mode, the heat exchange medium in the heat exchange path flows through the second heat exchanger and the third heat exchanger in sequence for heat exchange, and when the system is in heating mode, the heat exchange medium can directly enter the third heat exchanger through the first branch for heat exchange without flowing through the second heat exchanger.
[0023] In the preferred technical solution of the above heat pump air conditioning system, the heat pump air conditioning system further includes a regenerator.
[0024] The first port of the regenerator is in communication with the second port of the first heat exchanger;
[0025] The second port of the regenerator is communicated with the air inlet of the ejector and the first outlet of the third heat exchanger respectively;
[0026] The third port of the regenerator is in communication with the fourth port of the four-way valve;
[0027] The fourth port of the regenerator is communicated with the exhaust port of the gas-liquid separator.
[0028] In the preferred technical solution of the above-mentioned heat pump air-conditioning system, the heat pump air-conditioning system includes a second branch, a first end of which is connected to the pipeline between the fourth port of the regenerator and the exhaust port of the gas-liquid separator, and a second end is connected to the pipeline between the third port of the regenerator and the fourth interface of the four-way valve.
[0029] In the preferred technical solution of the above-mentioned heat pump air-conditioning system, the heat pump air-conditioning system also includes a second valve body and a third valve body, the second valve body is arranged on the second branch, and the third valve body is arranged on the pipeline between the third port of the regenerator and the second end of the second branch.
[0030] In the preferred technical solution of the above heat pump air conditioning system,
[0031] The first port of the second throttling device is in communication with the first outlet of the third heat exchanger, and the second port of the second throttling device is in communication with the second port of the regenerator and the ejection port of the ejector respectively; or
[0032] The first port of the second throttling device is in communication with the first port of the regenerator, and the second port of the second throttling device is in communication with the second port of the first heat exchanger.
[0033] In the preferred technical solution of the above heat pump air-conditioning system, the second valve body and / or the third valve body is configured as a one-way valve or a solenoid valve.
[0034] In the preferred technical solution of the above heat pump air conditioning system, the refrigerant used by the heat pump air conditioning system is CO2.
[0035] When the above technical solution is adopted, CO2 as a refrigerant will not cause harm to the environment and its heating performance is outstanding. BRIEF DESCRIPTION OF THE DRAWINGS
[0036] The heat pump air conditioning system of the present application is described below with reference to the accompanying drawings. In the drawings:
[0037] Figure 1 A schematic diagram of a heat pump air conditioning system in cooling mode of the present application;
[0038] Figure 2 Schematic diagram of the heat pump air conditioning system in heating mode of this application.
[0039] Reference Signs List
[0040] 10. Compressor; 20. Four-way valve; 21. First port; 22. Second port; 23. Third port; 24. Fourth port; 31. First heat exchanger; 32. Second heat exchanger; 321. First inlet; 322. First outlet; 323. Second inlet; 324. Second outlet; 33. Third heat exchanger; 331. First inlet; 332. First outlet; 333. Second inlet; 334. Second outlet; 40 , regenerator; 41, first port; 42, second port; 43, third port; 44, fourth port; 50, ejector; 60, gas-liquid separator; 61, air inlet; 62, exhaust port; 63, liquid discharge port; 71, first throttling device; 72, second throttling device; 80, heat exchange flow path; 81, first branch; 82, three-way valve; 83, first valve body; 91, second branch; 92, second valve body; 93, third valve body. DETAILED DESCRIPTION
[0041] The preferred embodiments of the present application are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present application and are not intended to limit the scope of protection of the present application. For example, in the heating mode, although the heat exchange medium of the present application can be heat-exchanged only in the third heat exchanger through the first branch, this is not intended to limit the scope of protection of the present application. Without deviating from the principles of the present application, those skilled in the art can also change its internal settings. For example, the first branch, the three-way valve and the first valve body are omitted.
[0042] It should be noted that, in the description of this application, the terms "upper", "lower", "left", "right", "inside", "outside", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on this application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. In addition, in the description of this application, "multiple" refers to at least two.
[0043] Furthermore, it should be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.
[0044] As described in the background technology, a heat pump air conditioning water system is a system that uses the heat pump principle to provide heating or cooling. Generally speaking, a heat pump air conditioning water system includes a refrigerant circulation system and a water circulation system. The refrigerant circulation system can be used to provide heating or cooling, while the water circulation system can be used to transfer the heat or cooling generated in the refrigerant circulation system to the indoor space.
[0045] The heat exchangers within the refrigerant circulation system typically consist of an air-cooled heat exchanger and a liquid-cooled heat exchanger. The refrigerant circulation system requires different amounts of refrigerant in heating and cooling modes. For example, when the liquid-cooled heat exchanger functions as an evaporator, the system requires a relatively large amount of refrigerant, while when it functions as a condenser, the system requires relatively less refrigerant. In these cases, an additional liquid reservoir is required to regulate the refrigerant volume within the system. This not only increases costs but can also complicate the air conditioning system, potentially affecting its stability.
[0046] In order to solve the problems of high cost and poor stability caused by the need to additionally set up a liquid reservoir in the existing CO2 heat pump air conditioning system, the present application provides a heat pump air conditioning system, which includes a compressor; a four-way valve, wherein the first interface of the four-way valve is connected to the exhaust port of the compressor, and the third interface of the four-way valve is connected to the intake port of the compressor; a first heat exchanger, wherein the first port of the first heat exchanger is connected to the second interface of the four-way valve; an ejector, wherein the air inlet of the ejector is connected to the second port of the first heat exchanger; a second heat exchanger, wherein the first inlet of the second heat exchanger is connected to the exhaust port of the ejector; a gas-liquid separator, wherein the air inlet of the gas-liquid separator is connected to the first outlet of the second heat exchanger, and the exhaust port of the gas-liquid separator is connected The port is connected to the fourth port of the four-way valve; the first throttling device, the first port of the first throttling device is connected to the discharge port of the gas-liquid separator; the third heat exchanger, the first inlet of the third heat exchanger is connected to the second port of the first throttling device, and the first outlet of the third heat exchanger is connected to the injection port of the ejector; the second throttling device, the first port of the second throttling device is connected to the first outlet of the third heat exchanger, and the second port of the second throttling device is connected to the second port of the first heat exchanger; the heat exchange flow path, the liquid inlet end of the heat exchange flow path is connected to the second inlet of the second heat exchanger, the second outlet of the second heat exchanger is connected to the second inlet of the third heat exchanger, and the second outlet of the third heat exchanger is connected to the liquid outlet end of the heat exchange flow path.
[0047] When the above technical solution is adopted, when the air-conditioning system is in different modes, the number of heat exchangers in the system is different. For example, in the cooling mode, the second heat exchanger and the third heat exchanger are both in the refrigeration cycle, and the demand for the refrigerant is greater, and the liquid refrigerant in the gas-liquid separator can be fully mobilized. In the heating mode, only the third heat exchanger is in the heating cycle, and the demand for the refrigerant is relatively small. The excess refrigerant can be stored in the gas-liquid separator. Therefore, there is no need to set up an additional liquid storage device to achieve the adjustment of the demand for the refrigerant, thereby reducing costs, simplifying system settings, and improving the operating stability of the system.
[0048] Refer to the following Figure 1 and Figure 2 , the heat pump air conditioning system of the present application is described. Figure 1 A schematic diagram of a heat pump air conditioning system in cooling mode of the present application; Figure 2 Schematic diagram of the heat pump air conditioning system in heating mode of this application.
[0049] like Figure 1As shown, in a preferred embodiment, the heat pump air conditioning system includes a compressor 10, a four-way valve 20, a first heat exchanger 31, a second heat exchanger 32, a third heat exchanger 33, a regenerator 40, an ejector 50, a gas-liquid separator 60, a first throttling device 71, a second throttling device 72, a heat exchange flow path 80, a first branch 81, a three-way valve 82, a first valve body 83, a second branch 91, a second valve body 92, and a third valve body 93. In this embodiment, the first valve body 83, the second valve body 92, and the third valve body 93 are all configured as one-way valves, and the first throttling device 71 and the second throttling device 72 are both configured as electronic expansion valves.
[0050] The first interface 21 of the four-way valve 20 is communicated with the exhaust port of the compressor 10, the second interface 22 is communicated with the first port (the right port in the direction of the figure) of the first heat exchanger 31, the second port (the left port in the direction of the figure) of the first heat exchanger 31 is communicated with the first port 41 of the regenerator 40, the second port 42 of the regenerator 40 is communicated with the air inlet of the ejector 50 and the second port (the left port in the direction of the figure) of the second throttling device 72 respectively, the injection port of the ejector 50 is communicated with the second port (the left port in the direction of the figure) of the second throttling device 72, the exhaust port of the ejector 50 is communicated with the first inlet 321 of the second heat exchanger 32, and the first outlet 32 of the second heat exchanger 32 is communicated with the first outlet 321 of the second heat exchanger 32. The outlet 62 of the gas-liquid separator 60 is connected to the air inlet 61 of the gas-liquid separator 60. The outlet 63 of the gas-liquid separator 60 is connected to the first port (the right port in the direction of the diagram) of the first throttling device 71. The second port (the left port in the direction of the diagram) of the first throttling device 71 is connected to the first inlet 331 of the third heat exchanger 33. The first outlet 332 of the third heat exchanger 33 is connected to the first port (the right port in the direction of the diagram) of the second throttling device 72. The exhaust port 62 of the gas-liquid separator 60 is connected to the fourth port 44 of the regenerator 40. The third port 43 of the regenerator 40 is connected to the fourth port 24 of the four-way valve 20. The third port 23 of the four-way valve 20 is connected to the intake port of the compressor 10. A first heat exchange path is formed between the first port 41 and the second port 42 of the regenerator 40, and a second heat exchange path is formed between the third port 43 and the fourth port 44. Heat exchange can be achieved between the first heat exchange path and the second heat exchange path. The second branch 91 is arranged in parallel with the second heat exchange path of the regenerator 40 (the path on the right side in the diagram). Specifically, the first end of the second branch 91 is connected to the pipeline between the fourth port 44 of the regenerator 40 and the exhaust port 62 of the gas-liquid separator 60, and the second end is connected to the pipeline between the third port 43 of the regenerator 40 and the fourth port 24 of the four-way valve 20. A second valve body 92 is provided in the second branch 91, and a third valve body 93 is provided in the pipeline between the third port 43 of the regenerator 40 and the second end of the second branch 91.
[0051] The liquid inlet of the heat exchange path 80 is connected to the second inlet 323 of the second heat exchanger 32. The second outlet 324 of the second heat exchanger 32 is connected to the second inlet 333 of the third heat exchanger 33. The second outlet 334 of the third heat exchanger 33 is connected to the liquid outlet of the heat exchange path 80. The first valve body 83 is located on the heat exchange path 80 between the second outlet 324 of the second heat exchanger 32 and the second inlet 333 of the third heat exchanger 33. The first port (the lower port in the drawing), the second port (the left port in the drawing), and the third port (the right port in the drawing) of the three-way valve 82 are respectively connected to the liquid inlet of the heat exchange path 80, the first end of the first branch 81, and the second inlet 323 of the second heat exchanger 32. The second end of the first branch 81 is connected to the heat exchange path 80 between the downstream of the first valve body 83 and the second inlet 333 of the third heat exchanger 33.
[0052] like Figure 1 As shown, when the heat pump air-conditioning system is in cooling mode, the first interface 21 of the four-way valve 20 is connected to the second interface 22, the third interface 23 is connected to the fourth interface 24, the first throttling device 71 is opened to a certain opening, and the second throttling device 72 is fully opened. The refrigerant is first compressed into a high-temperature and high-pressure gas by the compressor 10. The gaseous refrigerant discharged from the compressor 10 enters the first heat exchanger 31 through the four-way valve 20 and is cooled to become a refrigerant gas at room temperature and high pressure. It then passes through the first heat exchange path of the regenerator 40 (the left path in the direction of the figure) and is supercooled as a power fluid and enters the ejector 50. At the same time, The ejector 50 inhales the refrigerant gas generated by the heat exchange in the third heat exchanger 33. The gas-liquid two-phase refrigerant is mixed and then ejected to the second heat exchanger 32 through the ejector 50. The refrigerant absorbs heat and vaporizes in the second heat exchanger 32. Since the refrigerant heat exchange may be insufficient, the mixed refrigerant enters the gas-liquid separator 60. The separated gaseous refrigerant is overheated through the second heat exchange path of the regenerator 40 and returns to the compressor 10. The separated liquid refrigerant enters the third heat exchanger 33 for heat exchange after throttling and pressure reduction by the first throttling device 71. The refrigerant after heat exchange is inhaled by the ejector 50, and the refrigeration is circulated back and forth.
[0053] At the same time, the first interface and the third interface of the three-way valve 82 are connected, and the heat exchange medium in the heat exchange flow path 80 is first preliminarily cooled by the second heat exchanger 32, and then flows out after being fully cooled by the third heat exchanger 33.
[0054] like Figure 2As shown, when the heat pump air-conditioning system is in heating mode, the first interface 21 of the four-way valve 20 is connected to the fourth interface 24, the second interface 22 is connected to the third interface 23, the first throttling device 71 is fully open, and the second throttling device 72 is opened to a certain opening. After the compressor 10 discharges the high-temperature and high-pressure gaseous refrigerant, it passes through the four-way valve 20, the second valve body 92, the gas-liquid separator 60 and the first throttling device 71 in sequence to enter the third heat exchanger 33 to release heat, and then throttles and reduces pressure through the second throttling device 72, enters the first heat exchanger 31 through the second port 42 and the first port 41 of the regenerator 40 to absorb heat, and then returns to the compressor 10.
[0055] At the same time, the first port and the second port of the three-way valve 82 are connected, and the heat exchange medium in the heat exchange flow path 80 is directly heated by the third heat exchanger 33 and then flows out.
[0056] When the above technical solution is adopted, the number of heat exchangers in the air-conditioning system is different when it is in different modes. For example, in the cooling mode, the second heat exchanger 32 and the third heat exchanger 33 are both in the refrigeration cycle, and the demand for the refrigerant is greater, and the liquid refrigerant in the gas-liquid separator 60 can be fully mobilized. In the heating mode, only the third heat exchanger 33 is in the heating cycle, and the demand for the refrigerant is relatively small. The excess refrigerant can be stored in the gas-liquid separator 60. Therefore, there is no need to set up an additional liquid storage device to achieve the adjustment of the demand for the refrigerant, thereby reducing costs, simplifying system settings, and improving the operating stability of the system.
[0057] Those skilled in the art will appreciate that, although the heat exchange flow path 80 in this embodiment achieves switching of the flow direction of the heat exchange medium in different modes through the combination of the first branch 81, the three-way valve 82, and the first valve body 83, its specific configuration is not fixed. In an alternative embodiment, the switching of the flow direction of the heat exchange medium can be achieved by the cooperation of a four-way valve, multiple three-way valves, or multiple solenoid valves. In another alternative embodiment, the first branch 81, the three-way valve 82, or the first valve body 83 is omitted. When the system is in different modes, the heat exchange medium first passes through the second heat exchanger 32 and then passes through the third heat exchanger 33. Since the refrigerant does not pass through the second heat exchanger 32 in the heating cycle, the heat exchange medium does not exchange heat when passing through the second heat exchanger 32. In addition, the second throttling device 72 is not fixed. In an alternative embodiment, the second throttling device 72 can be set in the pipeline between the first port 41 of the regenerator 40 and the second port of the first heat exchanger 31. Of course, the regenerator 40 can also be omitted. However, considering that in the refrigeration cycle, the overcooling and overheating of the two refrigerants in the regenerator 40 are beneficial to improving the energy efficiency of the heat pump air-conditioning system, setting up the regenerator 40 is a better choice.
[0058] It should be explained that the configuration of the second branch 91 is not fixed. In an alternative embodiment, the first end of the second branch 91 can be connected to the pipeline between the drain port 63 of the gas-liquid separator 60 and the first port of the first throttling device 71, and the second end can be connected to the pipeline between the third port 43 of the regenerator 40 and the fourth port 24 of the four-way valve 20. In addition, the configuration of the second valve body 92 and the third valve body 93 is not fixed. In an alternative embodiment, the second valve body 92 or the third valve body 93 can also be configured as a solenoid valve. In another alternative embodiment, the second valve body 92 and the third valve body 93 can be omitted. In this case, a three-way valve can be provided to selectively allow the refrigerant to flow through the second heat exchange path of the regenerator 40. However, considering the cost of the configuration and the difficulty of control, configuring the first valve body 83, the second valve body 92, and the third valve body 93 as one-way valves is a preferred option.
[0059] Those skilled in the art will also understand that the configuration of the four-way valve 20 is not fixed. In an alternative embodiment, multiple three-way valves can be connected to achieve switching between heating and cooling modes. In addition, in this embodiment, the refrigerant used in the air-conditioning system is CO2. CO2 is a new generation of clean refrigerant that is non-toxic, harmless, environmentally friendly, and has excellent heating performance. However, its configuration is not fixed, and those skilled in the art can replace it with other refrigerants as needed.
[0060] Those skilled in the art will appreciate that although some embodiments described herein include certain features included in other embodiments but not other features, combinations of features from different embodiments are intended to be within the scope of this application and to form different embodiments. For example, in the claims of this application, any of the claimed embodiments may be used in any combination.
[0061] Thus far, the technical solutions of the present application have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is readily understood by those skilled in the art that the scope of protection of the present application is obviously not limited to these specific embodiments. Without departing from the principles of the present application, those skilled in the art may make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will fall within the scope of protection of the present application.
Claims
1. A heat pump air conditioning system, characterized in that: include: compressor; a four-way valve, wherein a first interface of the four-way valve is communicated with the exhaust port of the compressor, and a third interface of the four-way valve is communicated with the intake port of the compressor; a first heat exchanger, wherein a first port of the first heat exchanger is in communication with a second port of the four-way valve; an ejector, wherein an air inlet of the ejector is in communication with the second port of the first heat exchanger; a second heat exchanger, wherein a first inlet of the second heat exchanger is in communication with an exhaust port of the ejector; a gas-liquid separator, wherein the gas inlet of the gas-liquid separator is connected to the first outlet of the second heat exchanger, and the exhaust port of the gas-liquid separator is connected to the fourth interface of the four-way valve; a first throttling device, wherein a first port of the first throttling device is in communication with a liquid discharge port of the gas-liquid separator; a third heat exchanger, wherein a first inlet of the third heat exchanger is in communication with the second port of the first throttling device, and a first outlet of the third heat exchanger is in communication with the ejection port of the ejector; a second throttling device, wherein a first port of the second throttling device is in communication with a first outlet of the third heat exchanger, and a second port of the second throttling device is in communication with a second port of the first heat exchanger; A heat exchange flow path, wherein the liquid inlet end of the heat exchange flow path is connected to the second inlet of the second heat exchanger, the second outlet of the second heat exchanger is connected to the second inlet of the third heat exchanger, and the second outlet of the third heat exchanger is connected to the liquid outlet end of the heat exchange flow path.
2. The heat pump air conditioning system according to claim 1, characterized in that: The heat pump air conditioning system further includes a first branch, a first end of the first branch is connected to the liquid inlet end of the heat exchange flow path, and a second end of the first branch is connected to the second inlet of the third heat exchanger.
3. The heat pump air conditioning system according to claim 2, characterized in that: A three-way valve is also provided on the heat exchange flow path, and the first, second and third interfaces of the three-way valve are respectively connected to the liquid inlet end of the heat exchange flow path, the first end of the first branch and the second inlet of the second heat exchanger.
4. The heat pump air conditioning system according to claim 3, characterized in that: The heat exchange flow path is also provided with a first valve body. The first valve body is located between the second outlet of the second heat exchanger and the second inlet of the third heat exchanger. The second end of the first branch is communicated with the heat exchange flow path between the downstream of the first valve body and the second inlet of the third heat exchanger.
5. The heat pump air conditioning system according to any one of claims 1 to 4, characterized in that: The heat pump air conditioning system further includes a regenerator, The first port of the regenerator is in communication with the second port of the first heat exchanger; The second port of the regenerator is communicated with the air inlet of the ejector and the first outlet of the third heat exchanger respectively; The third port of the regenerator is in communication with the fourth port of the four-way valve; The fourth port of the regenerator is communicated with the exhaust port of the gas-liquid separator.
6. The heat pump air conditioning system according to claim 5, characterized in that: The heat pump air conditioning system includes a second branch, a first end of which is connected to the pipeline between the fourth port of the regenerator and the exhaust port of the gas-liquid separator, and a second end of which is connected to the pipeline between the third port of the regenerator and the fourth interface of the four-way valve.
7. The heat pump air conditioning system according to claim 6, characterized in that: The heat pump air conditioning system further includes a second valve body and a third valve body. The second valve body is arranged on the second branch, and the third valve body is arranged on the pipeline between the third port of the regenerator and the second end of the second branch.
8. The heat pump air conditioning system according to claim 5, characterized in that: The first port of the second throttling device is in communication with the first outlet of the third heat exchanger, and the second port of the second throttling device is in communication with the second port of the regenerator and the ejection port of the ejector respectively; or The first port of the second throttling device is in communication with the first port of the regenerator, and the second port of the second throttling device is in communication with the second port of the first heat exchanger.
9. The heat pump air conditioning system according to claim 7, characterized in that: The second valve body and / or the third valve body is configured as a one-way valve or a solenoid valve.
10. The heat pump air conditioning system according to claim 1, characterized in that: The refrigerant used in the heat pump air conditioning system is CO2.