Air conditioning system

Abstract

The utility model relates to the technical field of air conditioners, in particular to an air conditioning system. The CO2 heat pump air conditioning system aims at solving the problems that an existing CO2 heat pump air conditioning system has leakage risks and is poor in refrigeration effect. In order to achieve the purpose, the air conditioning system comprises a refrigerant circulating system and a liquid circulating system, the refrigerant circulating system comprises a compressor, an ejector, a first outdoor heat exchanger, a second outdoor heat exchanger and the like, and the liquid circulating system comprises a first indoor heat exchanger and the like. The refrigerant and the liquid are subjected to heat exchange through the second outdoor heat exchanger, and then the liquid circulation system transmits the cooling capacity generated by heat exchange into a room, so that the refrigerant is prevented from leaking indoors, the system is relatively simple in arrangement, and the running stability of the system can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioning, in particular to an air conditioning system. Background Art

[0002] As a new generation of clean refrigerant, CO2 is non-toxic and harmless, has good environmental performance, and is a type of refrigerant with great development potential. Its outstanding heating performance makes the CO2 air-conditioning system not only applicable to daily life scenarios such as household air-conditioning and car air-conditioning, but also has great application and promotion prospects in household / commercial scenarios such as heat pump water heaters and heat pump floor heating.

[0003] However, in the above-mentioned large-scale usage scenarios, the CO2 flux in the CO2 heat pump air-conditioning system is very high, and the pressure is very high during operation. There may be a risk of leakage when directly exposed to the external environment. In addition, the refrigeration performance of CO2 is not outstanding compared to its heating performance, and it even has certain shortcomings compared to traditional refrigerants.

[0004] Accordingly, the art needs a new technical solution to solve the above problems. Utility Model Content

[0005] In order to solve at least one of the above problems in the prior art, that is, to solve the problems of leakage risk and poor refrigeration effect of the existing CO2 heat pump air-conditioning system, the present application provides an air-conditioning system, which includes a refrigerant circulation system and a liquid circulation system, and the refrigerant circulation system includes:

[0006] compressor;

[0007] a first outdoor heat exchanger, wherein a first port of the first outdoor heat exchanger is in communication with an exhaust port of the compressor;

[0008] an ejector, wherein an air inlet of the ejector is in communication with a second port of the first outdoor heat exchanger;

[0009] A gas-liquid separator, wherein the air inlet of the gas-liquid separator is communicated with the exhaust port of the ejector, and the exhaust port of the gas-liquid separator is communicated with the air intake port of the compressor;

[0010] 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;

[0011] A second outdoor heat exchanger, wherein a refrigerant inlet of the second outdoor heat exchanger is connected to the second port of the first throttling device, and a refrigerant outlet of the second outdoor heat exchanger is connected to the injection port of the ejector;

[0012] The liquid circulation system comprises:

[0013] A first indoor heat exchanger, wherein a liquid outlet of the first indoor heat exchanger is communicated with a liquid inlet of the second outdoor heat exchanger, and a liquid outlet of the second outdoor heat exchanger is communicated with a liquid inlet of the first indoor heat exchanger.

[0014] When the above technical solution is adopted, the refrigerant and liquid exchange heat through the second outdoor heat exchanger, and then the liquid circulation system transfers the cold generated by the heat exchange to the indoor room, thereby avoiding leakage of the refrigerant indoors. The system setting is relatively simple, which can improve its stability during operation.

[0015] In the preferred technical solution of the above-mentioned air-conditioning system, the refrigerant circulation system also includes a four-way valve, and the first interface, the second interface, the third interface, and the fourth interface of the four-way valve are respectively connected to the exhaust port of the compressor, the exhaust port of the gas-liquid separator, the intake port of the compressor and the first port of the first outdoor heat exchanger.

[0016] When the above technical solution is adopted, the heating mode and the cooling mode of the air-conditioning system can be switched through the four-way valve.

[0017] In the preferred technical solution of the above-mentioned air-conditioning system, the refrigerant circulation system also includes a heat regenerator, and the first port, the second port, the third port and the fourth port of the heat regenerator are respectively connected to the second port of the first outdoor heat exchanger, the air inlet of the ejector, the air intake port of the compressor and the third interface of the four-way valve.

[0018] When the above technical solution is adopted, the refrigerant on both sides of the reheater can be overcooled and overheated, which can further improve the energy efficiency of the entire air-conditioning system and ensure the reliability of the compressor during operation.

[0019] In the preferred technical solution of the above air conditioning system, the refrigerant circulation system further includes a first branch and a second throttling device.

[0020] The first end of the first branch is connected to the pipeline between the refrigerant outlet of the second outdoor heat exchanger and the injection port of the ejector, and the second end is connected to the pipeline between the second port of the first outdoor heat exchanger and the first port of the regenerator;

[0021] The second throttling device is arranged on the pipeline between the second end of the first branch and the second port of the first outdoor heat exchanger.

[0022] When the above technical solution is adopted, the second outdoor heat exchanger can be used for heating through the first branch, and the flow direction of the refrigerant in the outdoor heat exchanger remains unchanged when in different modes, which is conducive to countercurrent heat exchange. In addition, the refrigerant entering the first outdoor heat exchanger can be throttled and reduced in pressure through the second throttling device, thereby improving the system energy efficiency in the heating mode.

[0023] In a preferred technical solution of the above-mentioned air-conditioning system, the maximum opening of the first throttling device is greater than the maximum opening of the second throttling device.

[0024] When the above technical solution is adopted, it can be avoided that the opening of the first throttling device is too small, thereby throttling and reducing the pressure of the refrigerant flowing to the second heat exchanger in the heating mode.

[0025] In the preferred technical solution of the above air conditioning system,

[0026] The refrigerant circulation system further includes a first valve body, which is arranged on a pipeline between the exhaust port of the ejector and the air inlet of the gas-liquid separator; and / or

[0027] The refrigerant circulation system further includes a second valve body, wherein the second valve body is arranged on the first branch; and / or

[0028] The refrigerant circulation system further includes a third valve body, which is disposed on the pipeline between the second end of the first branch and the first port of the regenerator.

[0029] In the preferred technical solution of the above air conditioning system,

[0030] The refrigerant circulation system further comprises a first drying filter, wherein the first drying filter is located between the first port of the first throttling device and the liquid discharge port of the gas-liquid separator; and / or

[0031] The refrigerant circulation system further includes a second drying filter, wherein the second drying filter is located between the second throttling device and the second end of the first branch; and / or

[0032] The first valve body and / or the second valve body and / or the third valve body are configured as one-way valves.

[0033] When the above technical solution is adopted, ice blockage during the throttling process can be avoided by using the first drying filter or the second drying filter.

[0034] In a preferred technical solution of the above air conditioning system, the liquid circulation system includes a pump body, a liquid outlet of the pump body is connected to the liquid inlet of the first indoor heat exchanger, and a liquid return port of the pump body is connected to the liquid outlet of the second outdoor heat exchanger.

[0035] In a preferred technical solution of the above air-conditioning system, the liquid circulation system further includes a second indoor heat exchanger, and the second indoor heat exchanger is arranged in parallel with the first indoor heat exchanger.

[0036] In the preferred technical solution of the above air conditioning system, the refrigerant circulation system uses CO2 as the refrigerant, and / or

[0037] The refrigerant and the liquid in the second outdoor heat exchanger flow in opposite directions.

[0038] When the above technical solution is adopted, CO2 as a refrigerant will not cause harm to the environment, and its heating performance is outstanding. The countercurrent heat exchange between the refrigerant and the liquid can improve the heat exchange efficiency on both sides of the heat exchanger, further improving the refrigeration effect of the air-conditioning system, thereby improving the system energy efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The air conditioning system of the present application is described below with reference to the accompanying drawings. In the accompanying drawings:

[0040] Figure 1 A schematic diagram of an air conditioning system in cooling mode of the present application;

[0041] Figure 2 Schematic diagram of the air conditioning system in heating mode of the present application.

[0042] Reference numerals list

[0043] 50. Refrigerant circulation system;

[0044] 501. Compressor;

[0045] 502, four-way valve;

[0046] 5031, a first outdoor heat exchanger; 5032, a second outdoor heat exchanger;

[0047] 504, regenerator;

[0048] 505, ejector;

[0049] 506. Gas-liquid separator;

[0050] 5071, first throttling device; 5072, second throttling device;

[0051] 508, first branch road;

[0052] 5091, a first valve body; 5092, a second valve body; 5093, a third valve body;

[0053] 5101, a first drying filter; 5102, a second drying filter;

[0054] 80. Liquid circulation system;

[0055] 8011, first indoor heat exchanger; 8012, second indoor heat exchanger;

[0056] 802. Pump body. DETAILED DESCRIPTION

[0057] The preferred embodiments of the present application are described below with reference to the accompanying drawings. It should be understood by those skilled in the art 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. Although the air-conditioning system of the present application is described in combination with refrigeration and heating, this is not intended to limit the scope of protection of the present application. Without departing from the principles of the present application, those skilled in the art may also change its internal settings. For example, when the air-conditioning system only needs to complete refrigeration, the four-way valve, the first branch, and the second throttling device are omitted.

[0058] It should be noted that, in the description of the present application, the terms "upper", "lower", "left", "right", "inside", "outside" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are merely for the convenience of description and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present 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 the present application, "multiple" refers to at least two.

[0059] In addition, it should be noted that in the description of this application, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0060] As described in the background technology, CO2 is a new generation of clean refrigerant that is non-toxic and harmless, has good environmental performance, and is a type of refrigerant with great development potential. In addition, its outstanding heating performance makes the CO2 air-conditioning system applicable not only to daily life scenarios such as household air-conditioning and car air-conditioning, but also to household / commercial scenarios such as heat pump water heaters and heat pump floor heating. It has great application and promotion prospects.

[0061] However, in the above-mentioned large-scale usage scenarios, the CO2 flux in the CO2 heat pump air-conditioning system is very high, and the pressure is very high during operation. There may be a risk of leakage when directly exposed to the external environment. In addition, the refrigeration performance of CO2 is not outstanding compared to its heating performance, and it even has certain shortcomings compared to traditional refrigerants.

[0062] In order to solve the problems of leakage risk and poor refrigeration effect in the existing CO2 heat pump air-conditioning system, the present application provides an air-conditioning system, which includes a refrigerant circulation system and a liquid circulation system, and the refrigerant circulation system includes: a compressor; a first outdoor heat exchanger, a first port of the first outdoor heat exchanger is connected to the exhaust port of the compressor; an ejector, an air inlet of the ejector is connected to the second port of the first outdoor heat exchanger; a gas-liquid separator, an air inlet of the gas-liquid separator is connected to the exhaust port of the ejector, and the exhaust port of the gas-liquid separator is connected to the intake port of the compressor; a first throttling device, a first port of the first throttling device is connected to the discharge port of the gas-liquid separator; a second outdoor heat exchanger, a refrigerant inlet of the second outdoor heat exchanger is connected to the second port of the first throttling device, and a refrigerant outlet of the second outdoor heat exchanger is connected to the injection port of the ejector; the liquid circulation system includes: a first indoor heat exchanger, a liquid outlet of the first indoor heat exchanger is connected to the liquid inlet of the second outdoor heat exchanger, and the liquid outlet of the second outdoor heat exchanger is connected to the liquid inlet of the first indoor heat exchanger.

[0063] When the above technical solution is adopted, the refrigerant and liquid exchange heat through the second outdoor heat exchanger, and then the liquid circulation system transfers the cold generated by the heat exchange to the indoor room, thereby avoiding leakage of the refrigerant indoors. The system setting is relatively simple, which can improve its stability during operation.

[0064] Refer to the following Figure 1 and Figure 2 , the air conditioning system of the present application is described. Among them, Figure 1 A schematic diagram of an air conditioning system in cooling mode of the present application; Figure 2 Schematic diagram of the air conditioning system in heating mode of the present application.

[0065] like Figure 1 As shown, in a preferred embodiment, the air conditioning system includes a refrigerant circulation system 50 and a liquid circulation system 80. The refrigerant circulation system 50 includes a compressor 501, a four-way valve 502, a first outdoor heat exchanger 5031, a second outdoor heat exchanger 5032, a regenerator 504, an ejector 505, a gas-liquid separator 506, a first throttling device 5071, a second throttling device 5072, a first branch 508, a first valve body 5091, a second valve body 5092, a third valve body 5093, a first filter dryer 5101 and a second filter dryer 5102. In this embodiment, the first valve body 5091, the second valve body 5092 and the third valve body 5093 are all configured as one-way valves, the first throttling device 5071 and the second throttling device 5072 are both configured as electronic expansion valves, the maximum opening of the first throttling device 5071 is greater than the maximum opening of the second throttling device 5072, and the second outdoor heat exchanger 5032 is configured as a liquid-cooled heat exchanger.

[0066] The exhaust port of the compressor 501 is connected to the first interface a of the four-way valve 502, the fourth interface d of the four-way valve 502 is connected to the first port of the first outdoor heat exchanger 5031 (the right port in the direction of the figure), the first port of the regenerator 504 (the upper left port in the direction of the figure) and the second port of the first outdoor heat exchanger 5031 (the left port in the direction of the figure), the air inlet of the ejector 505 is connected to the second port of the regenerator 504 (the lower left port in the direction of the figure), the exhaust port of the ejector 505 is connected to the air inlet of the gas-liquid separator 506, the exhaust port of the gas-liquid separator 506 is connected to the second interface b of the four-way valve 502, the third interface c of the four-way valve 502 is connected to the fourth port of the regenerator 504 (the lower right port in the direction of the figure), and the third port of the regenerator 504 (the upper right port in the direction of the figure) is connected to the suction port of the compressor 501. The first port of the first throttling device 5071 (the right port in the direction shown in the figure) is connected to the drain port of the gas-liquid separator 506, the refrigerant inlet of the second outdoor heat exchanger 5032 is connected to the second port of the first throttling device 5071 (the left port in the direction shown in the figure), and the refrigerant outlet of the second outdoor heat exchanger 5032 is connected to the injection port of the ejector 505.

[0067] The first end of the first branch 508 is connected to the pipeline between the refrigerant outlet of the second outdoor heat exchanger 5032 and the injection port of the ejector 505, and the second end is connected to the pipeline between the second port of the first outdoor heat exchanger 5031 and the first port of the regenerator 504. The second throttling device 5072 is arranged on the pipeline between the second end of the first branch 508 and the second port of the first outdoor heat exchanger 5031.

[0068] The first valve body 5091 is disposed on the pipeline between the exhaust port of the ejector 505 and the air inlet of the gas-liquid separator 506, the second valve body 5092 is disposed on the first branch 508, and the third valve body 5093 is disposed on the pipeline between the second end of the first branch 508 and the first port of the regenerator 504. The first filter dryer 5101 is located between the first port of the first throttling device 5071 and the liquid discharge port of the gas-liquid separator 506, and the second filter dryer 5102 is located between the second throttling device 5072 and the second end of the first branch 508.

[0069] The liquid circulation system 80 includes a first indoor heat exchanger 8011, a second indoor heat exchanger 8012 and a pump body 802. The first indoor heat exchanger 8011 and the second indoor heat exchanger 8012 are arranged in parallel, and the liquid outlet of the first indoor heat exchanger 8011 and the second indoor heat exchanger 8012 after being connected in parallel is communicated with the liquid inlet of the second outdoor heat exchanger 5032, and the liquid outlet of the second outdoor heat exchanger 5032 is communicated with the liquid return port of the pump body 802, and the liquid outlet of the pump body 802 is communicated with the liquid inlet of the first indoor heat exchanger 8011 and the second indoor heat exchanger 8012 after being connected in parallel. Among them, the refrigerant and the liquid in the second outdoor heat exchanger 5032 flow in opposite directions.

[0070] like Figure 1 As shown, when the air conditioning system is in cooling mode, the first interface a of the four-way valve 502 is connected to the fourth interface d, the second interface b is connected to the third interface c, the first throttling device 5071 is opened to a certain opening, and the second throttling device 5072 is fully opened. The refrigerant is first compressed into a high-temperature and high-pressure gas by the compressor 501. The gaseous refrigerant discharged from the compressor 501 enters the first outdoor heat exchanger 5031 through the four-way valve 502 and is cooled to become a refrigerant gas at normal temperature and high pressure. It is then supercooled by the second throttling device 5072, the second drying filter 5102, the third valve body 5093, and the regenerator 504 in sequence, and then enters the ejector 505 as a power fluid. At the same time, the ejector 505 sucks the second outdoor heat exchanger 5032 for exchange. The refrigerant gas generated by heat, the gas-liquid two-phase refrigerant is mixed and then sprayed into the gas-liquid separator 506 through the ejector 505. The separated gaseous refrigerant enters the regenerator 504 through the four-way valve 502 and returns to the compressor 501 after being overheated. The separated liquid refrigerant is dried by the first drying filter 5101 and throttled and reduced in pressure by the first throttling device 5071, and then enters the second outdoor heat exchanger 5032 for heat exchange. The refrigerant after heat exchange is sucked into the ejector 505, thereby performing a reciprocating cycle of refrigeration.

[0071] like Figure 2 As shown, when the air conditioning system is in heating mode, the first interface a of the four-way valve 502 is connected to the second interface b, the third interface c is connected to the fourth interface d, the first throttling device 5071 is fully opened, and the second throttling device 5072 is opened to a certain opening. After the compressor 501 discharges the high-temperature and high-pressure gaseous refrigerant, it passes through the four-way valve 502, the gas-liquid separator 506, the first drying filter 5101 and the first throttling device 5071 in sequence, and then enters the second outdoor heat exchanger 5032 to release heat, and then enters the first outdoor heat exchanger 5031 to absorb heat from the environment through the first branch 508, the second drying filter 5102 and the second throttling device 5072. Finally, it returns to the compressor 501 through the four-way valve 502 and the regenerator 504.

[0072] It should be explained that, under the action of the pump body 802, the liquid in the liquid circulation system 80 exchanges heat with the refrigerant in the second outdoor heat exchanger 5032 in countercurrent flow, and the completely cooled or heated liquid enters the first indoor heat exchanger 8011 and the second indoor heat exchanger 8012 respectively, and exchanges heat with the indoor air through the first indoor heat exchanger 8011 and the second indoor heat exchanger 8012 to complete the indoor cooling or heating. In addition, a plurality of control valves are also provided in the liquid circulation system 80 to control the on-off of the liquid circuit of a single or multiple indoor heat exchangers, but those skilled in the art can also change the number of indoor heat exchangers and control valves according to needs, or omit the pump body 802.

[0073] When the above technical solution is adopted, the liquid in the liquid circulation system 80 can maintain the same flow direction in both heating and cooling modes, and the degree of absorption of cold or heat in the refrigerant circulation system 50 is increased through countercurrent heat exchange with the second outdoor heat exchanger 5032, thereby improving the system energy efficiency.

[0074] It is understood by those skilled in the art that, although the four-way valve 502 can realize the switching between the heating mode and the cooling mode of the air conditioning system in this embodiment, the setting of the four-way valve 502 is not fixed. In an alternative embodiment, the switching between the heating mode and the cooling mode can be realized by multiple three-way valves connected in a coordinated manner. In addition, the regenerator 504 can also be omitted, but considering the reliability of the compressor 501, setting the regenerator 504 is a better choice.

[0075] Those skilled in the art can also understand that, in this embodiment, the first branch 508 and can make the refrigerant bypass the ejector 505 in the heating mode, so as to achieve efficient heating of the air conditioning system, but its specific setting is not static. In an alternative embodiment, the second filter drier 5102 and the second throttling device 5072 can be arranged on the first branch 508, and when the air conditioning system is in the cooling mode, the refrigerant does not flow through the second throttling device 5072. In addition, the setting of the first valve body 5091, the second valve body 5092 and the third valve body 5093 is also not static. In an alternative embodiment, the first valve body 5091, the second valve body 5092 or the third valve body 5093 can also be set as a solenoid valve. However, considering the setting cost and control difficulty, it is a better choice to set the first valve body 5091, the second valve body 5092 and the third valve body 5093 as a one-way valve. Of course, those skilled in the art can set the matching connected pipelines and valve bodies according to the needs to control the on-off of the heating circuit. In addition, the settings of the first drying filter 5011 and the second drying filter 5012 are not fixed, and those skilled in the art may selectively cancel the setting of at least one of the two, and such a change does not deviate from the principle of the present application.

[0076] It should be explained that, in the present embodiment, the refrigerant used in the refrigerant circulation system is CO2, and water is used in the liquid circulation system to exchange heat with the indoor. Among them, CO2 is a new generation of clean refrigerant, which is non-toxic and harmless, has good environmental performance, and has outstanding heating performance, but the setting of the refrigerant or heat exchange medium is not fixed, and those skilled in the art can replace other refrigerants or heat exchange mediums according to needs. In addition, although the present embodiment is described in combination with refrigeration and heating, this is not intended to limit the scope of protection of the present application. Without departing from the principle of the present application, those skilled in the art can also change its internal settings. For example, when the air-conditioning system only needs to complete refrigeration, the four-way valve 502, the first branch 508, the second throttling device 5072, the first valve body 5091, the second valve body 5092 and the third valve body 5093 are omitted.

[0077] Those skilled in the art will appreciate that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the claims of the present application, any one of the claimed embodiments may be used in any combination.

[0078] So 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 easy for those skilled in the art to understand that the protection scope 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 can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present application.

Claims

1. An air conditioning system, characterized in that: The air conditioning system includes a refrigerant circulation system and a liquid circulation system, and the refrigerant circulation system includes: compressor; a first outdoor heat exchanger, wherein a first port of the first outdoor heat exchanger is in communication with an exhaust port of the compressor; an ejector, wherein an air inlet of the ejector is in communication with a second port of the first outdoor heat exchanger; A gas-liquid separator, wherein the air inlet of the gas-liquid separator is communicated with the exhaust port of the ejector, and the exhaust port of the gas-liquid separator is communicated with the air intake port of the compressor; 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 second outdoor heat exchanger, wherein a refrigerant inlet of the second outdoor heat exchanger is connected to the second port of the first throttling device, and a refrigerant outlet of the second outdoor heat exchanger is connected to the injection port of the ejector; The liquid circulation system comprises: A first indoor heat exchanger, wherein a liquid outlet of the first indoor heat exchanger is communicated with a liquid inlet of the second outdoor heat exchanger, and a liquid outlet of the second outdoor heat exchanger is communicated with a liquid inlet of the first indoor heat exchanger.

2. The air conditioning system according to claim 1, characterized in that: The refrigerant circulation system also includes a four-way valve, and the first interface, second interface, third interface and fourth interface of the four-way valve are respectively connected to the exhaust port of the compressor, the exhaust port of the gas-liquid separator, the intake port of the compressor and the first port of the first outdoor heat exchanger.

3. The air conditioning system according to claim 2, characterized in that: The refrigerant circulation system also includes a heat regenerator, and the first port, second port, third port and fourth port of the heat regenerator are respectively connected to the second port of the first outdoor heat exchanger, the air inlet of the ejector, the air intake port of the compressor and the third interface of the four-way valve.

4. The air conditioning system according to claim 3, characterized in that: The refrigerant circulation system further includes a first branch and a second throttling device. The first end of the first branch is connected to the pipeline between the refrigerant outlet of the second outdoor heat exchanger and the injection port of the ejector, and the second end is connected to the pipeline between the second port of the first outdoor heat exchanger and the first port of the regenerator; The second throttling device is arranged on the pipeline between the second end of the first branch and the second port of the first outdoor heat exchanger.

5. The air conditioning system according to claim 4, characterized in that: The maximum opening of the first throttling device is greater than the maximum opening of the second throttling device.

6. The air conditioning system according to claim 4, characterized in that: The refrigerant circulation system further includes a first valve body, which is arranged on a pipeline between the exhaust port of the ejector and the air inlet of the gas-liquid separator; and / or The refrigerant circulation system further includes a second valve body, wherein the second valve body is arranged on the first branch; and / or The refrigerant circulation system further includes a third valve body, which is disposed on the pipeline between the second end of the first branch and the first port of the regenerator.

7. The air conditioning system according to claim 6, characterized in that: The refrigerant circulation system further includes a first drying filter, wherein the first drying filter is located between the first port of the first throttling device and the liquid discharge port of the gas-liquid separator; and / or The refrigerant circulation system further includes a second drying filter, wherein the second drying filter is located between the second throttling device and the second end of the first branch; and / or The first valve body and / or the second valve body and / or the third valve body are configured as one-way valves.

8. The air conditioning system according to any one of claims 1 to 7, characterized in that: The liquid circulation system comprises a pump body, a liquid outlet of the pump body is communicated with a liquid inlet of the first indoor heat exchanger, and a liquid return port of the pump body is communicated with a liquid outlet of the second outdoor heat exchanger.

9. The air conditioning system according to claim 8, characterized in that: The liquid circulation system further includes a second indoor heat exchanger, which is arranged in parallel with the first indoor heat exchanger.

10. The air conditioning system according to claim 1, characterized in that: The refrigerant circulation system uses CO2 as the refrigerant, and / or The refrigerant and the liquid in the second outdoor heat exchanger flow in opposite directions.

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