WO2023024586A1

WO2023024586A1 - Air supply tank for air suspension system

Info

Publication number: WO2023024586A1
Application number: PCT/CN2022/092601
Authority: WO
Inventors: 韩振宇; 张捷; 郑修新
Original assignee: 青岛海尔空调电子有限公司; 青岛海尔空调器有限总公司; 海尔智家股份有限公司
Priority date: 2021-08-25
Filing date: 2022-05-13
Publication date: 2023-03-02
Also published as: CN113757135A

Abstract

An air supply tank for an air suspension system, comprising: a first cavity (121) and a second cavity (122) which are provided in a body (10) and have variable volumes; a liquid supply port (123) provided on the body (10) communicates with a liquid supply pipe (60), and an air outlet (124) communicates with an air outlet pipe (70); the first cavity (121) separately communicates with the liquid supply port (123) and the air outlet (124), and is used for converting a liquid refrigerant into a gas refrigerant; and the second cavity (122) may be filled with a gas; in the air supply tank, by providing the second cavity (122), the pressures of the first cavity (121) and second cavity (122) are balanced during normal operation, which can enable the air supply pressure of the air supply tank to be stable. In addition, the refrigerant filling amount is small; merely an electric heater the power of which is small needs to be used; and upstream circuit electric devices of large specifications do not need to be arranged, thus effectively reducing the production costs of an air suspension system.

Description

Air Supply Tanks for Air Suspension Systems

This application is based on a Chinese patent application with application number 202110984335.1 and a filing date of August 25, 2021, and claims the priority of this Chinese patent application. The entire content of this Chinese patent application is hereby incorporated by reference into this application.

technical field

The present application relates to the technical field of refrigeration equipment, for example, to an air supply tank for an air suspension system.

Background technique

When the air-suspended centrifugal compressor used in the chiller is working, its aerostatic bearing needs to provide a stable compressed air with a certain pressure from the outside to keep the shaft diameter supported by the bearing stably suspended near the center of the bearing, ensuring that the journal No contact wear with the bearing bush.

In order to realize the stable pressure supply of the air suspension centrifugal compressor, the existing air supply tank needs to be filled with a large amount of refrigerant for power supply, heating, gasification and pressurization; secondly, a high-power electric heater needs to be configured for rapid gasification of the refrigerant, and timely replenishment The pressure drop caused by the gas used by the bearing will increase the specifications of the electrical components related to the upstream power supply main circuit; in addition, a larger volume gas supply tank is required to stabilize the pressure.

Said scheme has increased the production cost of equipment greatly.

Contents of the invention

In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is presented below. The summary is not intended to be an extensive overview nor to identify key/important elements or to delineate the scope of these embodiments, but rather serves as a prelude to the detailed description that follows.

An embodiment of the present disclosure provides an air supply tank for an air suspension system, which can reduce the production cost of the equipment while supplying air at a stable pressure to the air suspension centrifugal compressor.

In some embodiments, the air supply tank for the air suspension system includes: a body, provided with a liquid supply port and an air outlet, the liquid supply port is used to communicate with the liquid supply pipe, and the air outlet is used to communicate with the liquid supply pipe The air outlet pipe is connected; the first cavity is arranged in the body, and the first cavity is respectively connected with the liquid supply port and the gas outlet, and the first cavity is used to convert the liquid refrigerant into a gaseous state Refrigerant; the second cavity is arranged in the body, and the second cavity can be filled with gas; the volume of the first cavity and the second cavity is variable; when the gas supply tank is working normally, the The second cavity is in pressure balance with the first cavity.

Optionally, the air supply tank further includes: a balloon installed in the body, the outside of the balloon is the first cavity, and the inside of the balloon is the second cavity.

Optionally, the balloon is made of elastic material.

Optionally, the air supply tank further includes: an inflation tube communicating with the balloon, the inflation tube is provided with a first valve body, and the inflation tube is used to inflate the balloon.

Optionally, the air supply tank further includes: an electric heater disposed at the bottom of the body, and the electric heater is used to heat the refrigerant in the first cavity.

Optionally, the body is provided with a pressure relief port, and the pressure relief port is used to communicate with the bypass pipe.

Optionally, the bypass pipe is provided with a second valve body.

Optionally, the air supply tank further includes: a pressure sensor installed on the body, the pressure sensor configured to detect the air supply pressure; a controller configured to adjust the second valve according to the air supply pressure The opening of the body or the working status of the electric heater.

Optionally, a third valve body is arranged on the liquid supply pipe.

Optionally, the gas supply tank further includes: a liquid level sensor installed in the first cavity, the liquid level sensor configured to detect the liquid level of the liquid refrigerant in the first cavity;

The controller is configured to control the opening of the third valve body according to the liquid level.

The air supply tank for the air suspension system provided by the embodiments of the present disclosure can achieve the following technical effects:

When the air pressure in the first cavity gradually decreases, the volume of the second cavity gradually increases to adapt to the reduced space of the first cavity due to the decrease in air pressure, and the air pressure in the second cavity will also gradually decrease, which is different from the first cavity. The air pressure in the first chamber is kept balanced, and since the second chamber occupies the inner space of the body, the air pressure in the first chamber will not drop sharply, so that the air supply tank can supply air stably and meet the use requirements of the bearing.

On this basis, since the air supply pressure of the air supply tank does not change too much, the electric heater does not need to frequently heat the liquid refrigerant to generate gaseous refrigerant.

In addition, since the second cavity occupies the internal space of the body, the electric heater can raise the air pressure of the first cavity to the preset value without heating for a long time; the presence of a small amount of refrigerant in the first cavity can also reach the preset value. The pressure is set, so the gas supply requirements can be met without a lot of liquid refrigerant.

In this application, by setting a second cavity in the gas supply tank and filling the second cavity with gas, the pressure of the first cavity and the second cavity can be balanced when the gas supply tank is in normal operation, so that the gas supply tank can The air supply pressure of the air suspension system is stable, and the refrigerant charge is small, so a small-power electric heater can be used, and there is no need to be equipped with a large-scale upstream circuit electrical device, which effectively saves the production cost of the air suspension system.

The foregoing general description and the following description are exemplary and explanatory only and are not intended to limit the application.

Description of drawings

One or more embodiments are exemplified by the corresponding drawings, and these exemplifications and drawings do not constitute a limitation to the embodiments, and elements with the same reference numerals in the drawings are shown as similar elements, The drawings are not limited to scale and in which:

Fig. 1 is a schematic structural diagram of an air supply tank for an air suspension system provided by an embodiment of the present disclosure;

Fig. 2 is a structural schematic diagram of another air supply tank for an air suspension system provided by an embodiment of the present disclosure;

Fig. 3 is a structural schematic diagram of another air supply tank used in an air suspension system provided by an embodiment of the present disclosure.

Reference signs:

10: body; 11: upper cover; 12: tank body; 121: first cavity; :122: second cavity; 123: liquid supply port; 124: air outlet; 13: safety valve;

20: balloon;

30: electric heater;

40: inflatable tube; 41: first valve body;

50: bypass pipe; 51: second valve body;

60: liquid supply pipe; 61: third valve body;

70: outlet pipe;

80: pressure sensor; 81: pressure controller;

90: liquid level sensor; 91: liquid level controller; 92: first preset liquid level; 93: second preset liquid level.

Detailed ways

In order to understand the characteristics and technical content of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure will be described in detail below in conjunction with the accompanying drawings. The attached drawings are only for reference and description, and are not intended to limit the embodiments of the present disclosure. In the following technical description, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown simplified in order to simplify the drawings.

The terms "first", "second" and the like in the description and claims of the embodiments of the present disclosure and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific sequence or sequence. It should be understood that the data so used may be interchanged under appropriate circumstances so as to facilitate the embodiments of the disclosed embodiments described herein. Furthermore, the terms "comprising" and "having", as well as any variations thereof, are intended to cover a non-exclusive inclusion.

In the embodiments of the present disclosure, the orientations or positional relationships indicated by the terms "upper", "lower", "inner", "middle", "outer", "front", "rear" etc. are based on the orientations or positional relationships shown in the drawings. Positional relationship. These terms are mainly used to better describe the embodiments of the present disclosure and their implementations, and are not used to limit that the indicated devices, elements or components must have a specific orientation, or be constructed and operated in a specific orientation. Moreover, some of the above terms may be used to indicate other meanings besides orientation or positional relationship, for example, the term "upper" may also be used to indicate a certain attachment relationship or connection relationship in some cases. Those skilled in the art can understand the specific meanings of these terms in the embodiments of the present disclosure according to specific situations.

In addition, the terms "setting", "connecting" and "fixing" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediary, or two devices, components or Internal connectivity between components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present disclosure according to specific situations.

Unless stated otherwise, the term "plurality" means two or more.

In the embodiments of the present disclosure, the character "/" indicates that the preceding and following objects are an "or" relationship. For example, A/B means: A or B.

The term "and/or" is an associative relationship describing objects, indicating that there can be three relationships. For example, A and/or B means: A or B, or, A and B, these three relationships.

It should be noted that, in the case of no conflict, the embodiments and the features in the embodiments of the present disclosure may be combined with each other.

As shown in FIG. 1 , an embodiment of the present disclosure provides an air supply tank for an air suspension system, which includes a body 10 , a first cavity 121 and a second cavity 122 .

The body 10 is provided with a liquid supply port 123 and an air outlet 124 , the liquid supply port 123 is used to communicate with the liquid supply pipe 60 , and the air outlet port 124 is used to communicate with the air outlet pipe 70 .

The first cavity 121 is disposed in the body 10 , and the first cavity 121 communicates with the liquid supply port 123 and the gas outlet 124 respectively. The first cavity 121 is used for converting the liquid refrigerant into a gaseous refrigerant.

The second cavity 122 is disposed in the body 10, and the second cavity 122 can be filled with gas; the volumes of the first cavity 121 and the second cavity 122 are variable.

When the gas supply tank is working normally, the pressure of the second cavity 122 is balanced with that of the first cavity 121 .

It can be understood that the liquid supply pipe 60 and the liquid supply port 123 are used to deliver liquid refrigerant to the air supply tank, and the air outlet 124 and the air outlet pipe 70 are used to supply air to the air suspension compressor. Wherein, the first cavity 121 is used as a refrigerant cavity for converting the liquid refrigerant into a gaseous refrigerant to supply the air suspension compressor, and the second cavity 122 is used as a balance cavity for stabilizing the air supply pressure of the first cavity 121 . The second cavity 122 can be filled with gas. Since the volumes of the first cavity 121 and the second cavity 122 are variable, the second cavity 122 loaded with gas expands or contracts with the change of the gas supply pressure.

As shown in Figures 2 and 3, when the air pressure in the first cavity 121 gradually decreases, the volume of the second cavity 122 gradually increases to accommodate the reduced space of the first cavity 121 due to the decrease in air pressure, and the second The air pressure in the cavity 122 will also gradually decrease to keep balance with the air pressure in the first cavity 121. Since the second cavity 122 occupies the inner space of the body 10, the air pressure in the first cavity 121 will not drop sharply. This enables the air supply tank to supply air stably to meet the use requirements of the bearing.

On this basis, since the air supply pressure of the air supply tank does not change too much, the electric heater 30 does not need to frequently heat the liquid refrigerant to generate the gas refrigerant.

In addition, since the second cavity 122 occupies the inner space of the body 10, the electric heater 30 can raise the air pressure of the first cavity 121 to a preset value without heating for a long time; A small amount of refrigerant can also reach the preset pressure, so there is no need for a lot of liquid refrigerant to meet the gas supply requirements.

Using the air supply tank for the air levitation system provided by the embodiment of the present disclosure, by setting the second cavity 122 in the air supply tank and filling the second cavity 122 with gas, when the air supply tank is working normally, The pressure balance between the first chamber 121 and the second chamber 122 can stabilize the air supply pressure of the air supply tank, and the amount of refrigerant charge is small, so a relatively small power electric heater 30 can be used instead of a larger specification. The upstream circuit electrical components effectively save the production cost of the air suspension system.

As an example, the body 10 includes an upper cover 11 and a tank body 12, the upper cover 11 is connected to the tank body 12 through a flange, and a gasket is provided between the flanges to prevent refrigerant leakage.

Optionally, the gas supply tank further includes a balloon 20 installed in the body 10 , the outside of the balloon 20 is a first cavity 121 , and the inside of the balloon 20 is a second cavity 122 .

It can be understood that the balloon 20 is the main component separating the first cavity 121 and the second cavity 122, the outer surface of the balloon 20 and the inner wall of the body 10 form the first cavity 121, and the inner wall of the balloon 20 forms the second cavity 122. The balloon 20 can be filled with gas, and the volume of the balloon 20 is changed by using the air pressure balance inside and outside the balloon 20, and the volume of the first cavity 121 and the second cavity 122 changes accordingly, and the supply of the gas supply tank is dynamically adjusted. Air pressure, so that the air supply pressure is relatively stable, and there will be no sudden rise or drop.

Optionally, the balloon 20 is made of elastic material. This can facilitate the volume of the balloon 20 to change, so that the air pressure in the first cavity 121 and the second cavity 122 can be stabilized relatively quickly, so as to ensure a stable air supply to the air suspension compressor.

Optionally, the air supply tank further includes an inflation tube 40 , the inflation tube 40 communicates with the balloon 20 , a first valve body 41 is disposed on the inflation tube 40 , and the inflation tube 40 is used to inflate the balloon 20 .

It can be understood that the inflation tube 40 is used to inflate the balloon 20 , and the first valve body 41 is used to control the communication state of the inflation tube 40 . When the air suspension system is turned on and the compressor is not started, open the first valve body 41 to inflate the inflation tube 40 into the balloon 20, and close the first valve body 41 after the inflation is completed to ensure that there is pressure in the balloon 20, so that The balloon 20 is kept in a closed state to balance the pressure on the inside and outside of the balloon 20 . Wherein, the first valve body 41 may be a solenoid valve or other valve body with adjustable opening.

As an example, the inflation tube 40 is installed on the upper cover 11 , and the inflation tube 40 is used to fill the balloon 20 with nitrogen gas.

Optionally, the air supply tank further includes an electric heater 30 disposed at the bottom of the main body 10 , and the electric heater 30 is used for heating the refrigerant in the first cavity 121 .

It can be understood that the electric heater 30 is used to heat the liquid refrigerant to generate gas refrigerant when the gas supply pressure is insufficient, so as to increase the gas supply pressure of the gas supply tank.

Optionally, the body 10 is provided with a pressure relief port, and the pressure relief port is used to communicate with the bypass pipe 50 .

It can be understood that the pressure relief port and the bypass pipe 50 are used to release pressure and reduce the pressure in the first cavity 121 when the air supply pressure of the air supply tank is too high.

As an example, the tank body 12 is provided with a safety valve 13 for overpressure protection of the gas supply tank.

Optionally, the bypass pipe 50 is provided with a second valve body 51 .

It can be understood that the second valve body 51 is a valve body with adjustable opening such as a solenoid valve or an electronic expansion valve, and the second valve body 51 is used to adjust the opening of the bypass pipe 50 for pressure relief.

Optionally, the air supply tank further includes a pressure sensor 80 and a controller, the pressure sensor 80 is installed on the body 10, the pressure sensor 80 is configured to detect the air supply pressure; the controller is configured to adjust the second valve body according to the air supply pressure The opening degree of 51 or the working state of electric heater 30.

It can be understood that the pressure sensor 80 is used to detect the air pressure in the first cavity 121, and transmit the pressure signal to the pressure controller 81, and the pressure controller 81 controls the second valve body 51 to release pressure or electrically discharge the pressure according to the air supply pressure. The heater 30 heats and vaporizes the liquid refrigerant to pressurize it.

Optionally, a third valve body 61 is disposed on the liquid supply pipe 60 .

It can be understood that the liquid supply pipe 60 is connected to the bottom of the tank body 12 to provide refrigerant for the air supply tank, and the second valve body 51 is arranged on the liquid supply pipe 60 for shutting off and opening the liquid refrigerant. Wherein, the second valve body 51 can be a valve body such as a solenoid valve or an electronic expansion valve.

Optionally, the gas supply tank further includes a liquid level sensor 90 and a controller, the liquid level sensor 90 is installed in the first cavity 121, and the liquid level sensor 90 is configured to detect the liquid level of the liquid refrigerant in the first cavity 121 ; The controller is configured to control the opening of the three valve bodies according to the height of the liquid level.

It can be understood that the liquid level sensor 90 is used to detect the liquid level height of the liquid refrigerant in the tank body 12, and the liquid level signal detected by the liquid level sensor 90 is transmitted to the liquid level controller 91, and the liquid level controller 91 is used to control the liquid level according to the liquid level. The position height controls the opening degree of the third valve body 61 .

As an example, the air supply tank is provided with a first preset liquid level 92 and a second preset liquid level 93. When the liquid refrigerant reaches the first preset liquid level 92, there is more liquid refrigerant, and the liquid level controller 91 Adjust the opening of the third valve body 61 to reduce the amount of liquid refrigerant entering; when the liquid refrigerant is lower than the second preset liquid level 93, there is less liquid refrigerant, and the liquid level controller 91 will set the third valve body 61 The opening of the valve is increased to increase the amount of liquid refrigerant entering.

As another example, the liquid level controller 91 and the pressure controller 81 are integrated on one controller.

The specific working process of the gas supply tank will be explained below by taking filling the balloon 20 with nitrogen gas as an example.

As shown in Figure 2, before the air suspension system is officially used, nitrogen gas of a certain pressure is filled into the balloon 20 through the inflation tube 40 to inflate the balloon 20, and the pressure inside the balloon 20 is P1, which is balanced with the air supply pressure P1 .

The electric heater 30 is used to heat the liquid refrigerant in the air supply tank to vaporize the refrigerant to generate gaseous refrigerant. At this time, the air supply pressure P1 increases to P2, as shown in FIG. 3 .

During the process of increasing the air supply pressure from P1 to P2, the balloon 20 will shrink under the external pressure, so that the pressure inside the balloon 20 will increase until the pressure inside and outside the balloon 20 is equal, so the pressure inside the balloon 20 Always equal to supply air pressure.

Since the balloon 20 occupies part of the space in the body 10, and the balloon 20 itself has a certain pressure, it can additionally increase the air pressure in the first cavity 121, the electric heater 30 does not need to be heated for a long time, and the air supply pressure is P2 can be reached quickly, and because the difficulty of generating gaseous refrigerant is reduced, the demand for liquid refrigerant is also reduced; the nitrogen in the balloon 20 expands or compresses with the change of the gas supply pressure, which stabilizes the pressure of the gas supply tank. The air supply pressure does not change too much, and the electric heater 30 does not need to frequently heat the liquid refrigerant.

As the bearing uses air, the air supply pressure in the air supply tank will gradually drop, and the balloon 20 will gradually begin to expand to adapt to the reduced space of the first cavity 121 due to the bearing air use, until the pressure in the balloon 20 is the same as the air supply. Air pressure is balanced. Due to the expansion of the balloon 20, the volume of the first cavity 121 shrinks, and the air supply pressure of the first cavity 121 decreases slowly, and will not drop too much, so that the air supply pressure can be stabilized to meet the use requirements of the bearing.

When the liquid level sensor 90 detects that the liquid refrigerant in the gas supply tank is lower than the second preset liquid level 93, the liquid level controller 91 sends a signal to the third valve body 61 to open the third valve body 61, and the liquid refrigerant passes through the liquid supply tank. The pipe 60 enters the air supply tank for replenishment until the liquid level reaches the first preset liquid level 92, the liquid level controller 91 sends a signal to the third valve body 61 to close the third valve body 61, and the liquid level stops rising.

When the pressure sensor 80 detects that the pressure of the air supply tank is lower than the first preset pressure, the pressure controller 81 sends a signal to the electric heater 30, turns on the electric heater 30, heats the liquid refrigerant to vaporize it, and increases the pressure of the air supply tank , when the pressure of the air supply tank rises to the second preset pressure, the pressure controller 81 sends a signal to the electric heater 30 to turn off the electric heater 30, and the pressure stops rising.

When the pressure sensor 80 detects that the pressure of the air supply tank is higher than the third preset pressure, the pressure controller 81 sends a signal to the second valve body 51, and the second valve body 51 is opened to a certain degree of opening, and the air supply tank is opened at a certain speed. The gaseous refrigerant in the gas is discharged through the bypass pipe 50 to reduce the pressure of the gas supply tank. When the pressure of the gas supply tank drops to the fourth preset pressure, the pressure controller 81 sends a signal to the second valve body 51, and the second valve body 51 is closed. Stop depressurization, the pressure stops dropping. Wherein, the pressure values of the second preset pressure and the fourth preset pressure may be the same.

In addition, when the pressure in the air supply tank exceeds the design pressure of the air supply tank, the safety valve 13 is automatically opened for pressure relief to protect the safety of the air supply tank.

The above-mentioned process realizes the requirements of stable air supply pressure of the air supply tank, less charge of refrigerant, and low power of the electric heater 30 .

Using the air supply tank for the air levitation system provided by the embodiment of the present disclosure, the balloon 20 is set in the air supply tank, and the balloon 20 is filled with gas to make it a second cavity 122, and the tank body Occupy a certain space in 12 to ensure that the pressure on the refrigerant side of the air supply tank will not be too low, reducing the amount of refrigerant charge. When the gas supply tank is working normally, the balloon 20 acts as a voltage regulator, and there is no need for a large amount of cold gas to stabilize the voltage. Electric heating does not need to heat and vaporize a large amount of refrigerant liquid in a short time, so only a small power electric heater is required. 30, which reduces the cost of the electric heater, and does not need to be equipped with larger-sized upstream circuit electrical components, effectively saving the production cost of the air suspension system.

The above description and drawings sufficiently illustrate the embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may incorporate structural and other changes. The examples merely represent possible variations. Individual components and functions are optional unless explicitly required, and the order of operations may vary. Portions and features of some embodiments may be included in or substituted for those of other embodiments. Embodiments of the present disclosure are not limited to the structures that have been described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

An air supply tank for an air suspension system, characterized in that it comprises:

The body (10) is provided with a liquid supply port (123) and an air outlet (124), the liquid supply port (123) is used to communicate with the liquid supply pipe (60), and the air outlet port (124) is used to communicate with the outlet The trachea (70) is connected;

The first cavity (121) is arranged in the body (10), the first cavity (121) communicates with the liquid supply port (123) and the gas outlet (124) respectively, the first cavity A cavity (121) is used to convert liquid refrigerant into gaseous refrigerant;

a second cavity (122), arranged in the body (10), and the second cavity (122) can be filled with gas;

The volumes of the first cavity (121) and the second cavity (122) are variable;

When the air supply tank works normally, the pressure of the second cavity (122) is balanced with that of the first cavity (121).
The air supply tank for the air suspension system according to claim 1, further comprising:

A balloon (20), installed in the body (10), the outside of the balloon (20) is the first cavity (121), and the inside of the balloon (20) is the second cavity. cavity (122).
The air supply tank for the air suspension system according to claim 2, wherein,

The balloon (20) is made of elastic material.
The air supply tank for the air suspension system according to claim 2, further comprising:

An inflation tube (40), communicated with the balloon (20), a first valve body (41) is arranged on the inflation tube (40), and the inflation tube (40) is used to supply air to the balloon (20). ) inflated.
The air supply tank for the air suspension system according to claim 1, further comprising:

The electric heater (30) is arranged at the bottom of the body (10), and the electric heater (30) is used for heating the refrigerant in the first cavity (121).
The air supply tank for the air suspension system according to claim 5, characterized in that,

The body (10) is provided with a pressure relief port, and the pressure relief port is used to communicate with the bypass pipe (50).
The air supply tank for the air suspension system according to claim 6, characterized in that,

The bypass pipe (50) is provided with a second valve body (51).
The air supply tank for the air suspension system according to claim 7, further comprising

a pressure sensor (80), installed on the body (10), the pressure sensor (80) configured to detect air supply pressure;

The controller is configured to adjust the opening degree of the second valve body (51) or the working state of the electric heater (30) according to the air supply pressure.
The air supply tank for the air suspension system according to any one of claims 1 to 8, characterized in that,

A third valve body (61) is arranged on the liquid supply pipe (60).
The air supply tank for the air suspension system according to claim 9, further comprising:

A liquid level sensor (90), installed in the first cavity (121), the liquid level sensor (90) is configured to detect the liquid level of the liquid refrigerant in the first cavity (121);

The controller is configured to control the opening degree of the third valve body (61) according to the liquid level.