Liquid supply method, liquid supply device, air suspension unit and storage medium

Abstract

The invention discloses a liquid supply method for an air suspension unit. The air suspension unit comprises a condenser, an evaporator and a liquid supply system. The liquid supply system comprises two liquid supply tanks; the liquid outlet side of the condenser and the liquid outlet sides of the two liquid supply tanks communicate with the liquid inlet side of a bearing of the compressor so as to supply liquid to the bearing. The liquid outlet side of the condenser communicates with the liquid inlet sides of the two liquid supply tanks, and liquid is supplied to the two liquid supply tanks through the pressure difference between the condenser and the evaporator. The liquid supply method comprises the steps that the running state of the air suspension unit is obtained; determining a target liquid supply object according to the running state of the air suspension unit; and supplying liquid to the target liquid supply object according to the liquid supply scheme corresponding to the target liquid supply object. In this way, the appropriate liquid supply scheme can be selected for liquid supply based on the target liquid supply object. And liquid is supplied to the two liquid supply tanks by utilizing the pressure difference between the condenser and the evaporator, so that a stable liquid supply source is ensured. The invention further discloses a liquid supply device for the air suspension unit, the air suspension unit and a storage medium.

Description

Technical Field

[0001] The present application relates to the technical field of air suspension units, for example, to a liquid supply method, a liquid supply device, an air suspension unit and a storage medium for an air suspension unit. Background Art

[0002] The working principle of the static pressure air suspension bearing is: the liquid refrigerant is transported to the porous static pressure air bearing, discharged from the air bearing and collected in the machine cavity of the motor, and then returned to the evaporator together with the refrigerant cooling the motor. The pressure difference between the refrigerant entering and leaving the bearing generates buoyancy, which provides stable suspension for the compressor rotor. This pressure difference is the suspension pressure difference, and the suspension pressure difference △P=P(liquid supply tank pressure)-P(machine cavity pressure). The suspension pressure difference within the appropriate range is one of the key factors to ensure the normal operation of the air suspension unit.

[0003] The related technology discloses an air suspension unit system, including: a refrigerant circulation loop and a compressor and an evaporator arranged in the refrigerant circulation loop; a liquid supply tank, provided with a liquid outlet connected to the compressor, the liquid supply tank is provided with a heating element, the heating element is used to heat the liquid refrigerant in the liquid supply tank, so that the liquid refrigerant in the liquid supply tank flows into the compressor, and provides liquid refrigerant to the bearings of the compressor; a connecting pipeline, one end of which is connected to the refrigerant circulation loop, and the other end is connected to the liquid supply tank; a gear pump, which is arranged in the connecting pipeline and can extract refrigerant from the refrigerant circulation loop and send it into the liquid supply tank.

[0004] In the process of implementing the embodiments of the present disclosure, it is found that there are at least the following problems in the related art:

[0005] The related technology utilizes a gear pump to extract liquid refrigerant to replenish the liquid refrigerant in the liquid supply tank, and the gear pump needs to work under full operating conditions, which accelerates the aging of the gear pump and makes the gear pump prone to failure.

[0006] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present application, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0007] In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not an extensive review, nor is it intended to identify key / critical components or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

[0008] The embodiments of the present disclosure provide a liquid supply method, a liquid supply device, an air suspension unit and a storage medium for an air suspension unit to reduce the aging problem of a gear pump.

[0009] In some embodiments, the liquid supply method for an air suspension unit, the air suspension unit includes: a condenser, an evaporator and a liquid supply system; the liquid supply system includes: two liquid supply tanks; wherein the liquid outlet side of the condenser and the liquid outlet sides of the two liquid supply tanks are both connected to the liquid inlet side of the bearing of the compressor to supply liquid to the bearing; the liquid outlet side of the condenser is connected to the liquid inlet sides of the two liquid supply tanks, and can supply liquid to the two liquid supply tanks by utilizing the pressure difference between the condenser and the evaporator; the liquid supply method includes: obtaining the operating status of the air suspension unit; determining the target liquid supply object according to the operating status of the air suspension unit; and supplying liquid to the target liquid supply object according to the liquid supply scheme corresponding to the target liquid supply object.

[0010] In some embodiments, the liquid supply device for the air suspension unit includes: a processor and a memory storing program instructions, and the processor is configured to execute the aforementioned liquid supply method for the air suspension unit when running the program instructions.

[0011] In some embodiments, the air suspension unit includes: an air suspension unit body, including: a condenser, an evaporator and a liquid supply system; the liquid supply system includes: two liquid supply tanks; wherein the liquid outlet side of the condenser and the liquid outlet sides of the two liquid supply tanks are both connected to the liquid inlet side of the bearing of the compressor to supply liquid to the bearing; the liquid outlet side of the condenser is connected to the liquid inlet sides of the two liquid supply tanks, and the pressure difference between the condenser and the evaporator is used to supply liquid to the two liquid supply tanks; and, the liquid supply device for the air suspension unit as mentioned above is installed on the air suspension unit body.

[0012] In some embodiments, the storage medium stores program instructions, and when the program instructions are run, the aforementioned liquid supply method for the air suspension unit is executed.

[0013] The liquid supply method, liquid supply device, air suspension unit and storage medium provided in the embodiments of the present disclosure can achieve the following technical effects:

[0014] The target liquid supply object is determined based on the operating state of the air suspension unit, and then the liquid supply scheme corresponding to the target liquid supply object is matched, and liquid is supplied to the target liquid supply object according to the liquid supply scheme. Among them, the target liquid supply object includes a bearing and two liquid supply tanks. The liquid outlet sides of the two liquid supply tanks are connected to the liquid inlet side of the bearing of the compressor. In this way, a suitable liquid supply scheme can be selected for liquid supply based on the target liquid supply object. Moreover, when the target liquid supply object is a liquid supply tank, the pressure difference between the condenser and the evaporator can be used to supply liquid to the two liquid supply tanks. In this way, even if a gear pump is not used, a stable liquid supply source can be guaranteed, and problems such as aging and failure of the gear pump can be avoided.

[0015] The above general description and the following description are exemplary and explanatory only and are not intended to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] One or more embodiments are exemplarily described by corresponding drawings, which do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements, and the drawings do not constitute a scale limitation, and wherein:

[0017] Figure 1 is a structural schematic diagram of an air suspension unit provided by an embodiment of the present disclosure;

[0018] Figure 2 is a structural schematic diagram of another air suspension unit provided in an embodiment of the present disclosure;

[0019] Figure 3 is a structural schematic diagram of another air suspension unit provided in an embodiment of the present disclosure;

[0020] Figure 4 is a structural schematic diagram of another air suspension unit provided in an embodiment of the present disclosure;

[0021] Figure 5 is a schematic diagram of a liquid supply method for an air suspension unit provided in an embodiment of the present disclosure;

[0022] Figure 6 is a schematic diagram of another liquid supply method for an air suspension unit provided in an embodiment of the present disclosure;

[0023] Figure 7 is a schematic diagram of another liquid supply method for an air suspension unit provided in an embodiment of the present disclosure;

[0024] Figure 8 is a schematic diagram of a liquid supply device for an air suspension unit provided in an embodiment of the present disclosure;

[0025] Fig. 9 is a schematic diagram of another liquid supply device for an air suspension unit provided in an embodiment of the present disclosure;

[0026] Fig.10 Schematic diagram of an air suspension unit provided in an embodiment of the present disclosure.

[0027] Reference numerals:

[0028] 1. Refrigerant circulation circuit; 101. Bypass pipeline; 102. Motor cooling pipeline; 2. Compressor; 3. Condenser; 4. Evaporator; 501. First liquid supply tank; 5011. First liquid inlet; 5012. First exhaust port; 5013. First liquid discharge port; 5014. First heating element; 502. Second liquid supply tank; 5021. Second liquid inlet; 5022. Second exhaust port; 5023. Second liquid discharge port; 5024. Second heating element; 503. First liquid inlet pipe; 504. First exhaust pipe; 505. First liquid discharge pipe; 506. Second liquid inlet pipe; 507. Second exhaust pipe; 508. Second liquid discharge pipe; 509. Third liquid inlet pipe; 510. Fourth liquid inlet pipe; 512. First pressure balance pipe; 511. Second pressure balance pipe; 513. Condenser discharge pipe. DETAILED DESCRIPTION

[0029] In order to be able to understand the features and technical contents of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0030] The terms "first", "second", etc. in the specification and claims of the embodiments of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so that the embodiments of the embodiments of the present disclosure described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0031] Unless otherwise stated, the term "plurality" means two or more.

[0032] In the embodiment of the present disclosure, the character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B indicates: A or B.

[0033] The term "and / or" is a description of the association relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or, A and B.

[0034] The term "correspondence" may refer to an association relationship or a binding relationship. The correspondence between A and B means that there is an association relationship or a binding relationship between A and B.

[0035] Combination Figure 1-4As shown, the embodiment of the present disclosure provides an air suspension unit, including a refrigerant circulation loop 1, a compressor 2, a condenser 3 and an evaporator 4, wherein the compressor 2, the condenser 3 and the evaporator 4 are arranged in the refrigerant circulation loop. Through the coordination of various structures of the air suspension unit and the phase change of the refrigerant, the cooling / heating of the air suspension unit can be achieved.

[0036] Optionally, the compressor 2 is provided with bearings and a machine cavity, and the liquid refrigerant is transported to the porous static pressure air bearing, discharged from the air bearing and collected in the machine cavity of the motor, and then returned to the evaporator together with the refrigerant for cooling the motor. The liquid refrigerant entering the bearing also acts as liquid level lubrication, and the vaporization temperature of part of the liquid refrigerant is reduced, which plays a role in cooling the bearing. The pressure difference between the refrigerant entering and exiting the bearing generates buoyancy for stable suspension of the compressor rotor. The pressure difference is the suspension pressure difference, and the suspension pressure difference △P = P (bearing liquid inlet side pressure) - P (machine cavity pressure). The range of the suspension pressure difference is generally between 450kpa and 650kpa.

[0037] In some embodiments, the air suspension unit also includes a bypass pipeline 101 and a motor cooling pipeline 102. The bypass pipeline 101 is connected to the condenser 3 and the evaporator 4, and the bypass pipeline 101 is provided with a bypass electronic expansion valve. The motor cooling pipeline 102 is connected to the inner cavity of the condenser 3 and the compressor, and the motor cooling pipeline 102 is provided with a motor cooling electronic expansion valve. By setting the bypass pipeline 101, the bypass pipeline is provided with a bypass electronic expansion valve for start and stop, high pressure ratio control and low load unloading bypass. By setting the motor cooling pipeline 102, the refrigerant in the condenser 3 enters the inner cavity of the compressor through the motor cooling electronic expansion valve. By adjusting the opening of the motor cooling electronic expansion valve, the temperature of the refrigerant entering the compressor can be adjusted, thereby ensuring that the compressor motor temperature is within a reasonable range.

[0038] In some embodiments, in combination Figure 2 As shown, the condenser 3 is connected to the liquid inlet side of the bearing. The air suspension unit also includes two liquid supply tanks. Each liquid supply tank is configured with a liquid inlet, an exhaust port and a liquid discharge port. The liquid inlet can be connected to the condenser 3, the exhaust port can be connected to the evaporator 4, and the liquid discharge port can be connected to the liquid inlet side of the bearing. The condenser 3 or the liquid supply tank provides liquid refrigerant for the bearing to suspend the bearing.

[0039] When the condenser 3 provides liquid refrigerant to the bearing, the condenser 3 is connected to the liquid inlet side of the bearing, and the discharge port of the liquid supply tank is blocked, so that the pressure difference between the condenser 3 and the machine cavity is used to make the liquid refrigerant in the condenser 3 enter the liquid inlet side of the bearing. When the liquid supply tank stores liquid refrigerant, the liquid inlet and exhaust port of the liquid supply tank are connected, and the discharge port is blocked, so that the pressure difference between the evaporator 4 and the condenser 3 allows the liquid refrigerant in the condenser 3 to enter and be stored in the liquid supply tank.

[0040] The air suspension unit provided in the embodiment of the present disclosure utilizes the condenser 3 or the liquid supply tank to provide liquid refrigerant for the bearing so that the bearing is suspended. The condenser 3 is connected to the liquid inlet side of the bearing. When the condenser 3 meets the liquid supply conditions, the condenser 3 can be used to directly provide liquid refrigerant for the bearing, without the need for a liquid storage tank, and even more without the need to set up a gear pump to replenish the liquid storage tank. When the liquid supply tank needs to store liquid refrigerant, the liquid inlet and exhaust port of the liquid supply tank are connected, and the liquid discharge port is blocked. During the normal operation of the compressor, the pressure in the evaporator 4 is greater than the pressure in the condenser 3. The pressure difference between the condenser 3 and the evaporator 4 is utilized to allow the liquid refrigerant in the condenser 3 to enter the liquid inlet side of the bearing, replenishing the liquid refrigerant in the liquid supply tank. Similarly, there is no need to set up a gear pump to replenish the liquid supply tank as in the related art, which not only saves energy, but also avoids problems such as aging and failure of the gear pump.

[0041] Optionally, a heating element is provided in each liquid supply tank. When the liquid supply tank provides liquid refrigerant to the bearing, the liquid inlet and the exhaust port of the liquid supply tank are blocked, the liquid discharge port is connected, and the heating element is turned on to adjust the pressure of the liquid supply tank, thereby utilizing the pressure difference between the liquid supply tank and the machine cavity to allow the liquid refrigerant in the liquid supply tank to enter the liquid inlet side of the bearing. In this arrangement, when the liquid supply tank provides liquid refrigerant to the bearing, the liquid discharge port is opened to connect the liquid supply tank with the liquid inlet side of the bearing; the liquid inlet and the exhaust port are blocked to maintain the liquid supply tank in a relatively sealed state, and the heating element heats the liquid supply tank to increase the pressure; under the action of the pressure difference between the liquid supply tank and the machine cavity, the liquid refrigerant in the liquid supply tank flows to the liquid inlet side of the bearing.

[0042] Combination Figure 2 As shown, the two liquid supply tanks are respectively a first liquid supply tank 501 and a second liquid supply tank 502 .

[0043] For the first liquid supply tank.

[0044] The first liquid supply tank 501 is configured with a first liquid inlet 5011, a first exhaust port 5012 and a first liquid drain port 5013. The first liquid inlet 5011 can be communicated with the condenser 3, the first exhaust port 5012 can be communicated with the evaporator 4, and the first liquid drain port 5013 can be communicated with the liquid inlet side of the bearing. A first heating element 5014 is provided in the first liquid supply tank 501.

[0045] When the first liquid supply tank provides liquid refrigerant to the bearing, the first liquid inlet 5011 and the first exhaust port 5012 are blocked, the first liquid discharge port 5013 is opened, and the first heating element 5014 heats the liquid refrigerant in the first liquid supply tank 501 to maintain the liquid supply pressure differential between the first liquid supply tank and the machine cavity, and utilizes the liquid supply pressure differential to make the liquid refrigerant in the first liquid supply tank flow to the liquid inlet side of the bearing through the first liquid discharge port.

[0046] When the first liquid supply tank stores liquid refrigerant, the first liquid inlet and the first exhaust port are opened, and the first liquid discharge port is blocked, and the pressure difference between the condenser 3 and the evaporator 4 is used to allow the liquid refrigerant in the condenser 3 to enter and be stored in the first liquid supply tank.

[0047] When the condenser 3 is used to provide liquid refrigerant for the bearing, the pressure difference between the condenser and the machine cavity needs to be greater than or equal to the pressure threshold. If the pressure difference is lower than the pressure threshold, the condenser 3 cannot meet the bearing's liquid supply needs. In order to ensure that the bearing is stably suspended, when the condenser 3 cannot meet the liquid supply conditions, the liquid supply tank needs to replace the condenser to supply liquid to the bearing without gaps. Therefore, when the condenser 3 supplies liquid to the bearing, at least one of the liquid supply tanks is in a state of preparing liquid supply.

[0048] When the first liquid supply tank is in the liquid supply preparation state, the first liquid inlet and the first liquid outlet are blocked, and the first heating element 5014 heats the liquid refrigerant in the first liquid supply tank 501 to maintain the pressure difference between the first liquid supply tank and the machine cavity. When the pressure difference is too large, the first exhaust port is opened to release the pressure of the first liquid supply tank. In this way, the first liquid supply tank is in the liquid supply preparation state.

[0049] Regarding the second liquid supply tank 502 .

[0050] The second liquid supply tank 502 is configured with a second liquid inlet 5021, a second exhaust port 5022, and a second liquid drain port 5023. The second liquid inlet 5021 can be communicated with the condenser 3, the second exhaust port 5022 can be communicated with the evaporator 4, and the second liquid drain port 5023 can be communicated with the liquid inlet side of the bearing. A second heating element 5024 is arranged in the second liquid supply tank 502.

[0051] When the second liquid supply tank provides liquid refrigerant to the bearing, the second liquid inlet and the second exhaust port are blocked, and the second liquid discharge port is opened. The second heating element heats the liquid refrigerant in the second liquid supply tank to maintain the liquid supply pressure difference between the second liquid supply tank and the compressor. The liquid refrigerant in the second liquid supply tank flows to the liquid inlet side of the bearing through the second liquid discharge port by utilizing the liquid supply pressure difference.

[0052] When the second liquid supply tank stores liquid refrigerant, the second liquid inlet and the second exhaust port are opened, and the second liquid discharge port is blocked, and the pressure difference between the condenser 3 and the evaporator 4 is used to allow the liquid refrigerant in the condenser 3 to enter and be stored in the second liquid supply tank.

[0053] When the second liquid supply tank is in the liquid supply preparation state, the second liquid inlet and the second liquid outlet are blocked, and the second heating element 5024 heats the liquid refrigerant in the second liquid supply tank 502 to maintain the pressure difference between the second liquid supply tank and the machine cavity. When the pressure difference is too large, the second exhaust port is opened to release the pressure of the second liquid supply tank. In this way, the second liquid supply tank is in the liquid supply preparation state.

[0054] During the normal operation of the compressor, when the pressure difference between the condenser and the machine cavity is greater than or equal to the pressure threshold, the condenser 3 is used to provide liquid refrigerant for the bearing. At the same time, one of the two liquid supply tanks is in a state of preparing liquid supply, and the other stores an appropriate amount of liquid refrigerant.

[0055] When the pressure difference between the condenser and the machine cavity is less than the pressure threshold, the first liquid supply tank 501 provides liquid refrigerant for the bearing, and the second liquid supply tank 502 stores liquid refrigerant; or the second liquid supply tank 502 provides liquid refrigerant for the bearing, and the first liquid supply tank 501 stores liquid refrigerant. When the preset conditions are met, the functions of the first liquid supply tank 501 and the second liquid supply tank 502 are interchanged, and liquid refrigerant is alternately provided to the bearing to maintain continuous and stable suspension of the compressor rotor.

[0056] In some embodiments, in combination Figure 2 The air suspension unit also includes: two liquid replenishment pipelines, namely the first liquid replenishment pipeline and the second liquid replenishment pipeline, which can be controlled to be turned on or off. Two liquid discharge pipelines, namely the first liquid discharge pipeline and the second liquid discharge pipeline. The liquid outlet side of the condenser is connected to the first liquid inlet 5011 of the first liquid supply tank 501 through the first liquid replenishment pipeline. The liquid outlet side of the first liquid supply tank 501 is connected to the bearing side of the compressor through the first liquid discharge pipeline. The liquid outlet side of the condenser is also connected to the second liquid inlet 5021 of the second liquid supply tank 502 through the second liquid replenishment pipeline. The liquid outlet side of the second liquid supply tank 502 is connected to the bearing side of the compressor through the second liquid discharge pipeline.

[0057] The two exhaust pipelines are a first exhaust pipeline and a second exhaust pipeline. The top of the first liquid supply tank is connected to the evaporator through the first exhaust pipeline. The top of the second liquid supply tank is connected to the evaporator through the second exhaust pipeline.

[0058] The first liquid replenishing pipeline includes: a first liquid inlet pipe 503. The first exhaust pipeline includes: a first exhaust pipe 504. The first liquid discharge pipeline includes: a first liquid discharge pipe 505.

[0059] Optionally, the first liquid inlet pipe 503 is connected to the condenser 3 and the first liquid inlet port 5011, and a first solenoid valve is provided on the first liquid inlet pipe 503. The condenser 3 and the first liquid inlet port 5011 of the first liquid supply tank 501 can be connected through the first liquid inlet pipe 503, so that the refrigerant in the condenser 3 is introduced into the first liquid supply tank 501. By providing the first solenoid valve, it is convenient to control the connection or blocking of the first liquid inlet pipe 503.

[0060] Optionally, the first liquid inlet pipe 503 is further provided with a one-way valve, which can limit the refrigerant in the first liquid inlet pipe 503 to flow from the condenser 3 to the first liquid supply tank 501. This arrangement can prevent the refrigerant from flowing back and improve the reliability of the liquid supply system.

[0061] Optionally, the first liquid inlet pipe 503 is connected to the bottom of the condenser 3, so as to facilitate the extraction of liquid refrigerant in the condenser 3.

[0062] Optionally, the first exhaust pipe 504 is connected to the first exhaust port 5012 and the evaporator 4, and a first electronic expansion valve is provided on the first exhaust pipe 504. The first liquid supply tank 501 can be connected to the evaporator 4 through the first exhaust pipe 504, so that the pressure difference between the condenser and the evaporator is conveniently used to press the refrigerant in the condenser into the first liquid supply tank, and replenish the liquid refrigerant for the first liquid supply tank 501. By providing the first electronic expansion valve, it is convenient to control the connection or blocking of the first exhaust pipe 504.

[0063] Optionally, the first exhaust pipe 504 is connected to the top of the evaporator 4 , so that the gas pressure in the first liquid supply tank 501 is kept consistent with the gas pressure in the evaporator 4 .

[0064] Optionally, the first end of the first liquid discharge pipe 505 is connected to the first liquid discharge port 5013, and the second end is connected to the liquid inlet side of the bearing. The first liquid discharge pipe 505 is provided with a fourth solenoid valve. By providing the first liquid discharge pipe 505, the first liquid supply tank 501 can provide liquid refrigerant to the bearing. By providing the fourth solenoid valve, the first liquid discharge pipe 505 can be controlled to be turned on / off.

[0065] In some embodiments, the first exhaust port 5012 is disposed at the top of the first liquid supply tank 501. This arrangement can prevent the liquid refrigerant from being discharged through the first exhaust port 5012.

[0066] In some embodiments, the first liquid discharge port 5013 and the first liquid inlet 5011 are disposed at the bottom of the first liquid supply tank 501. The first liquid inlet 5011 is disposed at the bottom of the first liquid supply tank 501 to avoid refrigerant splashing. When the first liquid supply tank 501 is used to supply liquid, the first heating element 5014 heats the liquid refrigerant in the first liquid supply tank 501, and the liquid refrigerant evaporates to increase the gas pressure at the top of the first liquid supply tank 501. Under the action of the gas pressure, the liquid refrigerant flows out through the first liquid discharge port 5013. Therefore, by disposing the first liquid discharge port 5013 at the bottom of the first liquid supply tank 501, more liquid refrigerant can be discharged.

[0067] In some embodiments, the second liquid replenishment pipeline includes: a second liquid inlet pipe 506. The air suspension unit also includes: a second exhaust pipeline. The second exhaust pipeline includes: a second exhaust pipe 507. The second liquid discharge pipeline includes: a second liquid discharge pipe 508. The second liquid replenishment pipeline, the second exhaust pipeline and the second liquid discharge pipeline can all be controlled to be turned on or off.

[0068] Optionally, the second liquid inlet pipe 506 is connected to the condenser 3 and the second liquid inlet port 5021, and a second solenoid valve is provided on the second liquid inlet pipe 506. The condenser 3 and the second liquid inlet port 5021 of the second liquid supply tank 502 can be connected through the second liquid inlet pipe 506, so that the refrigerant in the condenser 3 is introduced into the second liquid supply tank 502. By providing the second solenoid valve, it is convenient to control the connection or blocking of the second liquid inlet pipe 506.

[0069] Optionally, the second liquid inlet pipe 506 is connected to the bottom of the condenser 3, so as to facilitate the extraction of liquid refrigerant in the condenser 3.

[0070] Optionally, the second liquid inlet pipe 506 is further provided with a one-way valve. The one-way valve can limit the refrigerant in the second liquid inlet pipe 506 to flow from the condenser 3 to the second liquid supply tank 502. Such a configuration can prevent the refrigerant from flowing back and improve the reliability of the liquid supply system.

[0071] Optionally, the second exhaust pipe 507 is connected to the second exhaust port 5022 and the evaporator 4, and the second exhaust pipe 507 is provided with a second electronic expansion valve. The second liquid supply tank 502 can be connected to the evaporator 4 through the second exhaust pipe 507, so that the pressure difference between the condenser and the evaporator is used to press the refrigerant in the condenser into the second liquid supply tank 502, and the liquid refrigerant is added to the second liquid supply tank 502. By providing the second electronic expansion valve, it is convenient to control the connection or blocking of the second exhaust pipe 507.

[0072] Optionally, the second exhaust pipe 507 is connected to the top of the evaporator 4 , so that the gas pressure in the second liquid supply tank 502 is kept consistent with the gas pressure in the evaporator 4 .

[0073] Optionally, the first end of the second liquid discharge pipe 508 is connected to the second liquid discharge port, the second end of the second liquid discharge pipe 508 is connected to the liquid inlet side of the bearing, and the second liquid discharge pipe 508 is provided with a fifth solenoid valve. By providing the second liquid discharge pipe 508, the second liquid supply tank 502 can provide liquid refrigerant to the bearing. By providing the fifth solenoid valve, the second liquid discharge pipe 508 can be controlled to be turned on / off.

[0074] In some embodiments, the second exhaust port 5022 is disposed at the top of the second liquid supply tank 502. This arrangement can prevent the liquid refrigerant from being discharged through the second exhaust port 5022.

[0075] In some embodiments, the second liquid discharge port 5023 and the second liquid inlet 5021 are disposed at the bottom of the second liquid supply tank 502. The second liquid inlet 5021 is disposed at the bottom of the second liquid supply tank 502 to avoid refrigerant splashing. When the second liquid supply tank 502 is used to supply liquid, the second heating element 5024 heats the liquid refrigerant in the second liquid supply tank 502, and the liquid refrigerant evaporates to increase the gas pressure at the upper part of the second liquid supply tank 502. Under the action of the gas pressure, the liquid refrigerant flows out through the second liquid discharge port 5023. Therefore, by disposing the second liquid discharge port 5023 at the bottom of the second liquid supply tank 502, more liquid refrigerant can be discharged.

[0076] In some embodiments, the condenser 3 is provided with a condenser drain port. The air suspension unit further includes a condenser drain pipe 513, which is connected to the condenser drain port and the liquid inlet side of the bearing, and the condenser drain pipe 513 is provided with a third solenoid valve. By providing the condenser drain pipe 513, the condenser 3 can provide liquid refrigerant to the bearing. By providing the third solenoid valve, the condenser drain pipe 513 can be controlled to be turned on / off.

[0077] In some embodiments, the heating element is disposed at the bottom of the liquid supply tank, and the height of the heating element is lower than the height of the liquid discharge port. This arrangement can prevent the heating element from drying out, and the heating element is always immersed in the liquid refrigerant.

[0078] In some embodiments, a liquid level sensor is provided in the liquid supply tank, so as to facilitate the measurement of the liquid level of the liquid refrigerant in the liquid supply tank.

[0079] In some embodiments, a pressure sensor is provided in the liquid supply tank, so as to facilitate the measurement of the gas pressure in the liquid supply tank.

[0080] In some embodiments, a safety valve is disposed on the top of the liquid supply tank. With such an arrangement, when the gas pressure in the liquid supply tank is too high, the pressure can be released through the safety valve, thereby improving the safety of the liquid supply tank.

[0081] In some embodiments, the position height of the liquid supply tank is lower than the position height of the evaporator 4 and the condenser 3. In this way, it is convenient to make the liquid refrigerant in the evaporator 4 and the condenser 3 flow into the liquid supply tank under the action of gravity.

[0082] Optionally, the air suspension unit further includes: two liquid storage pipelines, namely a first liquid storage pipeline and a second liquid storage pipeline, which can be controlled to be turned on or off. The liquid outlet side of the condenser is connected to the liquid inlet side of the first liquid supply tank 501 through the first liquid storage pipeline. The liquid outlet side of the condenser is also connected to the liquid inlet side of the second liquid supply tank 502 through the second liquid storage pipeline.

[0083] Optionally, the first liquid storage pipeline includes a third liquid inlet pipe 509. The second liquid storage pipeline includes a fourth liquid inlet pipe 510.

[0084] The two pressure balancing pipelines are a first pressure balancing pipeline and a second pressure balancing pipeline. The top of the first liquid supply tank is connected to the evaporator through the first pressure balancing pipeline. The top of the second liquid supply tank is connected to the evaporator through the second pressure balancing pipeline. The conduction pressure of the exhaust pipeline is greater than the conduction pressure of the pressure balancing pipeline.

[0085] The first pressure balancing pipeline includes: a first pressure balancing pipe 512 ; the second pressure balancing pipeline includes: a second pressure balancing pipe 511 .

[0086] Optionally, the air suspension unit further includes a bypass pipeline 101. The bypass pipeline 101 is connected to the condenser 3 and the evaporator 4, and is provided with a bypass electronic expansion valve. The third liquid inlet pipe 509 is connected to the condenser 3 and the first liquid supply tank 501, and is provided with a first ball valve. The first pressure balance pipe 512 is connected to the first liquid supply tank 501 and the evaporator 4, and is provided with a second ball valve. When the air suspension unit is started, when the liquid refrigerant in the first liquid supply tank 501 is too little, the first ball valve, the second ball valve and the bypass electronic expansion valve are opened to use the condenser 3 / evaporator 4 to replenish the liquid refrigerant for the first liquid supply tank.

[0087] The bypass electronic expansion valve is opened to keep the gas pressure in the condenser 3 and the evaporator 4 consistent, the first ball valve and the second ball valve are opened, and the first liquid supply tank is connected to the evaporator and the condenser respectively. At this time, the refrigerant is stored in the first liquid supply tank 501 by the principle of gravity communication, that is, the refrigerant in the condenser / evaporator flows into and is stored in the first liquid supply tank 501.

[0088] Optionally, the third liquid inlet pipe 509 is connected to the bottom of the condenser 3; the first end of the first pressure balance pipe is connected to the top of the evaporator 4, and the second end of the first pressure balance pipe is connected to the top of the first liquid supply tank. The third liquid inlet pipe 509 is connected to the bottom of the condenser 3, which is convenient for leading out the liquid refrigerant in the condenser 3. The first end of the first pressure balance pipe 512 is connected to the top of the evaporator 4, and the second end of the first pressure balance pipe is connected to the top of the first liquid supply tank, which is convenient for keeping the gas pressure in the first liquid supply tank and the evaporator 4 consistent.

[0089] In some embodiments, the air suspension unit further includes a fourth liquid inlet pipe 510 and a second pressure balance pipe 511. The fourth liquid inlet pipe 510 is connected to the evaporator 4 and the second liquid supply tank 502, and the fourth liquid inlet pipe 510 is provided with a third ball valve. The second pressure balance pipe 511 is connected to the evaporator 4 and the second liquid supply tank 502, and is provided with a fourth ball valve. When the air suspension unit is turned on, when the liquid refrigerant in the second liquid supply tank is too little, the third ball valve and the fourth ball valve are opened to use the evaporator 4 to replenish the liquid refrigerant for the second liquid supply tank. The third ball valve and the fourth ball valve are opened, and the second liquid supply tank is connected to the evaporator. At this time, the second liquid supply tank 502 is stored with refrigerant by the principle of gravity communication, that is, the refrigerant in the evaporator flows into and is stored in the second liquid supply tank 502.

[0090] Optionally, the fourth liquid inlet pipe 510 is connected to the bottom of the evaporator 4; the first end of the second pressure balance pipe is connected to the top of the evaporator 4, and the second end of the second pressure balance pipe is connected to the top of the second liquid supply tank. The fourth liquid inlet pipe 510 is connected to the bottom of the evaporator 4, which is convenient for leading out the liquid refrigerant in the evaporator 4. The first end of the second pressure balance pipe is connected to the top of the evaporator 4, and the second end of the second pressure balance pipe is connected to the top of the second liquid supply tank, which is convenient for keeping the gas pressure in the second liquid supply tank and the evaporator 4 consistent.

[0091] Combination Figure 5 As shown, the embodiment of the present disclosure provides a liquid supply method for an air suspension unit, comprising:

[0092] S501, the air suspension unit obtains the operating status of the air suspension unit.

[0093] S502: The air suspension unit determines a target liquid supply object according to its operating status.

[0094] S503: The air suspension unit supplies liquid to the target liquid supply object according to the liquid supply plan corresponding to the target liquid supply object.

[0095] The operating state of the air suspension unit is obtained, such as one or more of the on / off state of the air suspension unit, the pressure of the condenser, and the pressure of the evaporator. According to the operating state of the air suspension unit, the target liquid supply object is determined. The target liquid supply object includes a bearing, a first liquid supply tank, and a second liquid supply tank. The unit is controlled to operate according to the liquid supply scheme corresponding to the target liquid supply object to supply liquid to the target liquid supply object.

[0096] The liquid supply method for an air suspension unit provided by the embodiment of the present disclosure is adopted, and the target liquid supply object is determined based on the operating state of the air suspension unit, and then the liquid supply scheme corresponding to the target liquid supply object is matched, and liquid is supplied to the target liquid supply object according to the liquid supply scheme. Among them, the target liquid supply object includes a bearing and two liquid supply tanks. The liquid outlet sides of the two liquid supply tanks are both connected to the liquid inlet side of the bearing of the compressor. In this way, a suitable liquid supply scheme can be selected for liquid supply based on the target liquid supply object. Moreover, when the target liquid supply object is a liquid supply tank, the pressure difference between the condenser and the evaporator can be used to supply liquid to the two liquid supply tanks. In this way, even if a gear pump is not used, a stable liquid supply source can be guaranteed, and problems such as aging and failure of the gear pump can be avoided.

[0097] Optionally, in step S502, the air suspension unit determines a target liquid supply object according to its operating state, including:

[0098] When the air suspension unit is in the start-up and shutdown states, the target liquid supply object is determined to be the liquid supply tank.

[0099] When the air suspension unit is in operation, the target liquid supply objects are determined to be the bearing and the liquid supply tank.

[0100] If the running state of the air suspension unit is startup, it is necessary to ensure that there is enough refrigerant in the liquid supply tank for bearing suspension. Therefore, at this time, the target liquid supply object is determined to be the liquid supply tank. If the running state of the air suspension unit is shutdown, it is necessary to ensure that the refrigerant in the liquid supply tank is sufficient for the next startup of the unit. Therefore, at this time, the target liquid supply object is determined to be the liquid supply tank.

[0101] Define the fluid supply tank that is supplying fluid to the bearing as a working fluid supply tank, and the fluid supply tank that is not supplying fluid to the bearing as an inoperative fluid supply tank. If the operating state of the air suspension unit is in operation, on the one hand, it is necessary to supply refrigerant to the bearing to suspend the bearing; on the other hand, when the fluid supply tank is used to supply fluid to the bearing, the refrigerant in the working fluid supply tank is consumed when supplying fluid to the bearing. When the fluid level drops to a certain level, another fluid supply tank is required to supply fluid to the bearing, and refrigerant is added to the fluid supply tank at the same time. Therefore, the target fluid supply objects are determined to be the bearing and the fluid supply tank.

[0102] Optionally, combined Figure 6 As shown, the embodiment of the present disclosure provides a liquid supply method for an air suspension unit, comprising:

[0103] S501, the air suspension unit obtains its operating status.

[0104] S502: The air suspension unit determines a target liquid supply object according to its operating status.

[0105] S513, when the target liquid supply object of the air suspension unit is a liquid supply tank, the air suspension unit selects a corresponding liquid supply scheme to supply liquid to the liquid supply tank according to the operating state of the air suspension unit.

[0106] S523, when the target liquid supply objects are the bearings and the liquid supply tank, the air suspension unit selects a liquid supply solution corresponding to the bearings and the liquid supply tank to supply liquid to the bearings and the liquid supply tank.

[0107] When the target liquid supply object is the liquid supply tank, the air suspension unit may be in the state of startup or shutdown, and then the corresponding liquid supply scheme is selected to supply liquid to the liquid supply tank according to the operating state of the air suspension unit. When the target liquid supply object is the bearing and the liquid supply tank, the liquid supply scheme corresponding to the bearing or the liquid supply tank is selected to supply liquid to the bearing and the liquid supply tank respectively. In this way, when the target liquid supply object is different and the state of the air suspension unit is different, the corresponding liquid supply scheme is selected to supply liquid to the target liquid supply object to meet the operating requirements of the air suspension unit.

[0108] Optionally, in step S513, the air suspension unit selects a corresponding liquid supply scheme to supply liquid to the liquid supply tank according to its operating state, including:

[0109] When the air suspension unit is in the operating state of starting or stopping, the liquid supply tank whose liquid level is lower than the lower limit liquid level is determined as the target liquid supply tank.

[0110] The gas suspension unit controls the condenser and / or the evaporator to supply liquid to the target liquid supply tank.

[0111] When the liquid level of the target liquid supply tank reaches the upper limit liquid level, the air suspension unit controls the heat exchanger corresponding to the target liquid supply tank to stop supplying liquid.

[0112] When the target liquid supply object is a liquid supply tank, and the operating state of the air suspension unit is on or off, the liquid supply tank whose liquid level is lower than the lower limit liquid level is determined by the liquid level sensor, and the liquid supply tank is determined as the target liquid supply tank. The target liquid supply tank may be the first liquid supply tank or the second liquid supply tank. As can be seen from the previous structure, the condenser and the evaporator can both supply liquid to the first liquid supply tank and the second liquid supply tank. Therefore, according to the on / off state of the unit, the condenser and / or the evaporator are selected to supply liquid to the target liquid supply tank. As the target liquid supply tank is supplied with liquid, the liquid level of the target liquid supply tank gradually rises. When the liquid level of the target liquid supply tank reaches the upper limit liquid level, the heat exchanger corresponding to the target liquid supply tank is controlled to stop supplying liquid.

[0113] Optionally, when the air suspension unit is in the startup state, controlling the condenser and / or the evaporator to supply liquid to the target liquid supply tank includes:

[0114] The air suspension unit controls the liquid storage pipeline corresponding to the target liquid supply tank to be connected; and,

[0115] The air suspension unit controls the on-off of the pressure balance pipeline corresponding to the target liquid supply tank according to the difference between the pressure of the target liquid supply tank and the pressure of the compressor chamber.

[0116] At this time, the unit is in the state of starting up but not running. Therefore, first control the bypass electronic expansion valve to open, and then control the bypass pipeline between the condenser and the evaporator to be connected. After the bypass pipeline is connected, the pressure between the condenser and the evaporator is balanced. At the same time, control the main liquid circuit electronic expansion valve to open. Then, control the liquid storage pipeline corresponding to the target liquid supply tank to be connected. Because the position of the liquid supply tank is lower than the position of the evaporator and the condenser, the liquid refrigerant flows into the target liquid supply tank through the liquid replenishment by using the communicating vessel principle and gravity. And as can be seen from the previous text, when the heat exchanger supplies liquid to the liquid supply tank, the liquid can be supplied through the liquid replenishment pipeline and the liquid storage pipeline. The conduction pressure of the liquid replenishment pipeline is greater than the conduction pressure of the liquid storage pipeline. Therefore, by controlling the conduction of the liquid replenishment pipeline, the refrigerant can more easily enter the target liquid supply tank.

[0117] When the target liquid supply tank is the first liquid supply tank, the liquid storage pipeline corresponding to the first liquid supply tank is controlled to be connected, and at this time, the condenser supplies liquid to the first liquid supply tank. When the target liquid supply tank is the second liquid supply tank, the liquid storage pipeline corresponding to the second liquid supply tank is controlled to be connected, and at this time, the evaporator supplies liquid to the second liquid supply tank.

[0118] At the same time, the difference between the pressure of the target liquid supply tank and the pressure of the compressor cavity is calculated in real time, and the on-off of the pressure balance pipeline corresponding to the target liquid supply tank is controlled according to the difference to avoid the pressure of the target liquid supply tank being too high. Specifically, if the difference is greater than the pressure difference threshold, the corresponding pressure balance pipeline is controlled to be turned on to relieve the pressure of the target liquid supply tank. If the difference is less than or equal to the pressure difference threshold, the corresponding pressure balance pipeline is controlled to be disconnected. The conduction pressure of the exhaust pipeline is greater than the conduction pressure of the pressure balance pipeline. Therefore, it is easier to relieve pressure by controlling the conduction of the pressure balance pipeline.

[0119] Optionally, when the air suspension unit is in a shutdown state, controlling the condenser and / or the evaporator to supply liquid to the target liquid supply tank includes:

[0120] Air suspension units calculate the pressure difference between the condenser and the evaporator.

[0121] When the pressure difference is greater than the pressure difference threshold, the air suspension unit controls the liquid replenishment pipeline and the exhaust pipeline corresponding to the target liquid supply tank to be connected.

[0122] When the pressure difference is less than or equal to the pressure difference threshold, the air suspension unit controls the liquid storage pipeline and the pressure balance pipeline corresponding to the target liquid supply tank to be connected.

[0123] After the unit is shut down, there may still be a pressure difference between the condenser and the evaporator. At this time, the liquid supply tank can be supplied with liquid by relying on the pressure difference, or by relying on the communicating vessel principle and gravity. The specific method of liquid supply needs to be determined according to the pressure of the condenser and the evaporator. Specifically, the pressure difference between the condenser and the evaporator is calculated in real time. If the pressure difference is greater than the pressure difference threshold, the liquid replenishment pipeline and the exhaust pipeline corresponding to the target liquid supply tank are controlled to be connected. Since the pressure difference is large at this time, the liquid replenishment pipeline and the exhaust pipeline with larger conduction pressure are controlled to be connected, which can prevent the liquid from entering and the pressure from being released too quickly, thereby accurately controlling the suspension pressure difference. If the pressure difference is less than or equal to the pressure difference threshold, the liquid storage pipeline and the pressure balance pipeline corresponding to the target liquid supply tank are controlled to be connected. Since the pressure difference is small at this time, the liquid storage pipeline and the pressure balance pipeline that are easier to conduct are controlled to be connected, which can make it easier to supply liquid and release pressure.

[0124] When the target liquid supply tank is the first liquid supply tank, if the liquid storage pipeline corresponding to the first liquid supply tank is controlled to be connected, the condenser supplies liquid to the first liquid supply tank. If the liquid replenishment pipeline corresponding to the first liquid supply tank is controlled to be connected, the condenser supplies liquid to the first liquid supply tank.

[0125] When the target liquid supply tank is the second liquid supply tank, if the liquid storage pipeline corresponding to the second liquid supply tank is controlled to be connected, the evaporator supplies liquid to the second liquid supply tank. If the liquid replenishment pipeline corresponding to the second liquid supply tank is controlled to be connected, the condenser supplies liquid to the second liquid supply tank.

[0126] Optionally, in step S523, when the target liquid supply object is a bearing and a liquid supply tank, the air suspension unit selects a liquid supply scheme corresponding to the bearing as bearing liquid supply, including:

[0127] The air suspension unit calculates the pressure difference between the condenser pressure and the compressor cavity pressure.

[0128] When the pressure difference of the air suspension unit is within the preset suspension pressure difference range, the condenser is controlled to supply fluid to the bearing.

[0129] When the pressure difference is less than the lower limit of the preset suspension pressure difference range, the air suspension unit controls the two liquid supply tanks to alternately supply liquid to the bearings; and controls the condenser to supply liquid to the non-working liquid supply tank; wherein the non-working liquid supply tank is the liquid supply tank that does not supply liquid to the bearings.

[0130] The operating status of the air suspension unit includes the pressure of the condenser and the pressure of the compressor cavity.

[0131] When the air suspension unit is in operation and the target liquid supply object is the liquid supply tank, the pressure difference between the pressure of the condenser and the pressure of the compressor cavity is calculated in real time. If the pressure difference is within the preset suspension pressure difference range, it indicates that the condenser can be used to supply liquid to the bearing. At this time, the condenser drain pipe is controlled to be connected, and then the condenser is controlled to supply liquid to the bearing. If the pressure difference is less than the lower limit of the preset suspension pressure difference range, the two liquid supply tanks are controlled to alternately supply liquid to the bearing. In this way, the liquid supply system provides a continuous and stable suspension pressure difference for the bearing. As the working liquid supply tank continues to supply liquid to the bearing, its liquid level will gradually decrease. When it drops to a certain level, it is impossible to provide a suspension pressure difference for the bearing, and it is necessary to switch to another liquid supply tank. Therefore, when the liquid supply tank is supplying liquid to the bearing at work, the condenser is controlled to supply liquid to the non-working liquid supply tank. This can prepare for switching the liquid supply tank.

[0132] Optionally, the lower limit of the preset suspension pressure difference range is 450 kPa, and the upper limit is 650 kPa.

[0133] Optionally, in step S523, when the target liquid supply object is a bearing and a liquid supply tank, the air suspension unit selects a liquid supply scheme corresponding to the bearing as bearing liquid supply, including:

[0134] The air suspension unit calculates the pressure difference between the condenser pressure and the compressor cavity pressure.

[0135] When the pressure difference of the air suspension unit is within the preset suspension pressure difference range, the condenser is controlled to supply fluid to the bearing.

[0136] The air suspension unit determines the liquid supply tank with the highest liquid level as the target liquid supply tank.

[0137] The air suspension unit controls the heating element in the target liquid supply tank to start.

[0138] The air suspension unit controls the on-off of the exhaust pipeline corresponding to the target liquid supply tank according to the difference between the pressure of the target liquid supply tank and the pressure of the compressor chamber.

[0139] When the pressure difference is less than the lower limit of the preset suspension pressure difference range, the air suspension unit controls the two liquid supply tanks to alternately supply liquid to the bearings; and controls the condenser to supply liquid to the non-working liquid supply tank; wherein the non-working liquid supply tank is the liquid supply tank that does not supply liquid to the bearings.

[0140] When the condenser is controlled to supply liquid to the bearing, as the refrigerant in the condenser is consumed, the pressure difference between it and the compressor cavity will gradually decrease, and thus the bearing suspension cannot be supported. Therefore, while the condenser is controlled to supply liquid to the bearing, the liquid supply tank with the highest liquid level is determined as the target liquid supply tank. Then the heating element in the target liquid supply tank is controlled to start so that the pressure in the target liquid supply tank meets the requirements of the preset suspension pressure difference range, and then it is ready to switch to the liquid supply tank to supply liquid to the bearing at any time. After the electric heating element is turned on, the pressure in the target liquid supply tank will gradually rise. In order to ensure that the pressure in the target liquid supply tank meets the requirements of the preset suspension pressure difference range, the on-off of the exhaust pipeline corresponding to the target liquid supply tank is controlled according to the pressure difference between the pressure of the target liquid supply tank and the pressure of the compressor cavity. Specifically, if the pressure difference is greater than the upper limit of the preset suspension pressure difference range, the exhaust pipeline corresponding to the target liquid supply tank is controlled to be turned on. If the pressure difference is within the preset suspension pressure difference range, the exhaust pipeline corresponding to the target liquid supply tank is controlled to be disconnected. As can be seen from the foregoing, since the conduction pressure of the exhaust pipeline is relatively large, the pressure in the liquid supply tank can be more accurately controlled by controlling the on-off of the exhaust pipeline to achieve pressure relief.

[0141] Optionally, the air suspension unit controls two fluid supply tanks to alternately supply fluid to the bearing, including:

[0142] When the liquid level in the working liquid supply tank of the air suspension unit reaches the lower limit liquid level, the heating element of the non-working liquid supply tank is controlled to be turned on.

[0143] When ΔPw is within the preset suspension pressure difference range, the air suspension unit controls the liquid supply tank that was originally working to exit the working state.

[0144] The air suspension unit controls the discharge pipeline corresponding to the non-working liquid supply tank to be connected.

[0145] Among them, the working fluid supply tank is the fluid supply tank that is supplying fluid to the bearing, and the non-working fluid supply tank is the fluid supply tank that is not supplying fluid to the bearing; ΔPw is the pressure difference between the pressure of the non-working fluid supply tank after entering the working state and the pressure of the compressor cavity.

[0146] The liquid level of the working liquid supply tank is obtained through the liquid level sensor. When the liquid level reaches the lower limit level, it indicates that the liquid level of the working liquid supply tank is already very low, and another liquid supply tank is needed to prepare the liquid supply. Then the heating element in the non-working liquid supply tank is controlled to be turned on to increase its refrigerant pressure. At the same time, the pressure difference ΔPw between the pressure of the non-working liquid supply tank after the heating element is turned on and the pressure of the compressor cavity is obtained in real time. If ΔPw is within the preset suspension pressure difference range, it means that the other switched liquid supply tank has met the bearing suspension requirements. At this time, the drain pipeline corresponding to the non-working liquid supply tank is controlled to be turned on, and the drain pipeline corresponding to the original working liquid supply tank is controlled to be disconnected to make it exit the working state. In this way, another liquid supply tank is used to supply liquid to the bearing. At the same time, the condenser is controlled to supply liquid to the liquid supply tank that has exited the working state, so that it enters the refrigerant storage state. By executing in this cycle, the bearing suspension liquid supply requirements in the normal operation of the compressor can be met.

[0147] Optionally, in step S523, when the target liquid supply objects are the bearing and the liquid supply tank, the air suspension unit selects a liquid supply scheme corresponding to the liquid supply tank as liquid supply to the liquid supply tank, including:

[0148] The air suspension unit controls the fluid replenishment pipeline corresponding to the non-operating fluid supply tank to be connected.

[0149] When the liquid level of the non-operating liquid supply tank of the air suspension unit reaches the upper limit liquid level, the corresponding liquid replenishing pipeline is controlled to be disconnected.

[0150] When the unit is running and the target fluid supply objects are the bearings and the fluid supply tank, the working fluid supply tank only executes the fluid supply logic, and the non-working fluid supply tank executes the refrigerant storage logic. The fluid replenishment pipeline corresponding to the non-working fluid supply tank is controlled to be connected, and then fluid is supplied to the non-working fluid supply tank. When the liquid level of the non-working fluid supply tank reaches the upper limit level, the corresponding fluid replenishment pipeline is controlled to be disconnected. In this way, when one fluid supply tank supplies fluid to the bearing, the other fluid supply tank is controlled to store refrigerant, preparing for switching the fluid supply of the fluid supply tank.

[0151] Combination Figure 7 As shown, the embodiment of the present disclosure provides another liquid supply method for an air suspension unit, comprising:

[0152] S501, the air suspension unit obtains its operating status.

[0153] S502: The air suspension unit determines a target liquid supply object according to its operating status.

[0154] S503: The air suspension unit supplies liquid to the target liquid supply object according to the liquid supply plan corresponding to the target liquid supply object.

[0155] S504, after the air suspension unit executes S501, when the unit is started and the compressor enters the pre-start preparation stage, the liquid supply tank with the highest liquid level is determined as the target liquid supply tank.

[0156] S505, the air suspension unit controls the heating element in the target liquid supply tank to turn on.

[0157] If the unit is turned on and the compressor enters the pre-startup preparation stage, the liquid supply tank with the highest liquid level among the two liquid supply tanks is determined as the target liquid supply tank. The heating element in the target liquid supply tank is controlled to turn on. At the same time, the valve corresponding to the target liquid supply tank is controlled to close. The heating element enters the working state, and after the suspension pressure difference is established, the compressor enters the starting operation state. In this way, the liquid supply tank with relatively more liquid storage is selected as the target liquid supply tank, and the heating element inside it is turned on to put the liquid supply tank into the working state. This is to avoid insufficient refrigerant in the liquid supply tank and the inability to establish the suspension pressure difference.

[0158] The specific implementation process of the liquid supply method for the air suspension unit provided by the embodiment of the present disclosure is described below by way of example:

[0159] In order to support bearing suspension, the pressure difference between the supply pressure of the supply tank and the pressure of the compressor chamber, that is, the supply pressure differential, needs to be within a preset suspension pressure differential range.

[0160] Phase 1: Unit startup

[0161] The bypass line is controlled to be connected, and the electronic expansion valve of the main liquid line is opened to facilitate the pressure balance between the condenser and the evaporator. If the liquid level of the liquid supply tank is lower than the lower limit level, the refrigerant needs to be added to the liquid supply tank. For example, if the liquid level of the first liquid supply tank is lower than the lower limit level, the first ball valve is controlled to open to control the connection of the first liquid storage line. Since the position of the first liquid supply tank is lower than the position of the evaporator and the condenser, the condenser supplies liquid to the first liquid supply tank using the principle of the communicating vessel. During this period, the second ball valve is controlled to open to control the connection of the first pressure balance line to relieve the pressure of the first liquid supply tank (at this time, the first exhaust line can also be controlled to be connected to increase the pressure relief speed). At this time, the liquid supply tank is supplied with liquid by the gravity of the refrigerant, which is sensitive to resistance. Therefore, the first liquid storage line that is easier to control to be connected can make the refrigerant flow into the first liquid supply tank more smoothly. As the refrigerant in the first liquid supply tank rises, when the liquid level reaches the upper limit level, the first ball valve is controlled to close. Then, the first heating element is controlled to be turned on so that the pressure difference between the first liquid supply tank and the compressor cavity is within the preset suspension pressure difference range. Then, the unit is controlled to start. After the start-up is completed, the bypass pipeline is controlled to be disconnected and the main liquid circuit electronic expansion valve is closed. The condenser liquid level is adjusted to the preset target value through the PID (Proportional-Integral-Derivative, proportional-integral-differential controller).

[0162] Phase 2: Unit in operation

[0163] Calculate the pressure difference between the condenser and the compressor cavity. If the pressure difference is within the preset suspension pressure difference range, it means that the condenser liquid supply can meet the preset suspension pressure difference requirement. Then control the third solenoid valve to open to control the condenser drain pipe to be connected. At this time, the liquid refrigerant in the condenser is supplied to the bearing.

[0164] Since the unit is currently in operation, the pressure of the condenser is greater than the pressure of the evaporator. If the first liquid supply tank is not supplied with liquid in "stage 1", the pressure difference between the condenser and the evaporator can be used to store refrigerant for the first liquid supply tank; or if the first liquid supply tank is already supplied with liquid in "stage 1", the pressure difference between the condenser and the evaporator can be used to store refrigerant for the second liquid supply tank. For example, if the second liquid supply tank needs to be controlled to store refrigerant at this time, the second solenoid valve is controlled to open to control the conduction of the second liquid replenishment pipeline, and then the second liquid supply tank is supplied with liquid. If the pressure difference between the second liquid supply tank and the compressor cavity is greater than the upper limit of the preset suspension pressure difference range, the second electronic expansion valve is controlled to open to control the conduction of the second exhaust pipeline to relieve the pressure of the second liquid supply tank. The flow rate of the second exhaust pipeline is relatively small, that is, the pressure relief amount is relatively small, so the pressure in the second liquid supply tank can be guaranteed more accurately. If the pressure difference between the second liquid supply tank and the compressor cavity is within the preset suspension pressure difference range, the second electronic expansion valve is controlled to close. As the refrigerant in the second liquid supply tank increases, when the liquid level reaches the upper limit liquid level, the second solenoid valve is controlled to close.

[0165] When the condenser is controlled to supply liquid to the bearing, the heating element in the liquid supply tank with the highest liquid level is controlled to start. In this way, the corresponding liquid supply tank is prepared to supply liquid to the bearing. For example, at this time, if the liquid level of the first liquid supply tank is greater than the liquid level of the second liquid supply tank, the first heating element is controlled to start.

[0166] When the pressure difference between the condenser and the compressor cavity is less than the lower limit of the preset suspension pressure difference range, it indicates that the condenser can no longer be relied on to supply liquid to the bearing. At this time, the third solenoid valve is controlled to close, and the fourth solenoid valve is controlled to control the first drain pipeline to be connected, and the first liquid supply tank is used to supply liquid to the bearing. When the pressure difference is greater than the upper limit of the preset suspension pressure difference range, the first heating element is controlled to be closed. When the pressure difference is less than the lower limit of the preset suspension pressure difference range, the first heating element is controlled to be turned on.

[0167] When the liquid level of the first liquid supply tank reaches the lower limit level, the second heating element is controlled to open. When the pressure difference between the second liquid supply tank and the compressor cavity is within the preset suspension pressure difference range, the first liquid discharge pipeline is controlled to be disconnected to make the first liquid supply tank exit the working state. At the same time, the first solenoid valve is controlled to open to supply liquid to the first liquid supply tank. And the first electronic expansion valve is controlled to open to make the first exhaust pipeline conductive and control the pressure relief of the first liquid supply tank. When the liquid level of the first liquid supply tank reaches the upper limit level, the first solenoid valve and the first electronic expansion valve are controlled to close. While the first liquid supply tank stores refrigerant, the fifth solenoid valve is controlled to open to control the second liquid discharge pipeline to be conductive. At this time, the second liquid supply tank is used to supply liquid to the bearing.

[0168] When the liquid level of the second liquid supply tank reaches the lower limit, it is necessary to switch to using the first liquid supply tank to supply liquid to the bearing, and control the second liquid supply tank to store refrigerant. For details, please refer to the control logic of using the second liquid supply tank to supply liquid to the bearing and controlling the first liquid supply tank to store refrigerant, which will not be repeated here.

[0169] In this way, the first liquid supply tank and the second liquid supply tank are controlled to alternately supply liquid to the bearing and alternately store refrigerant.

[0170] Phase 3: Unit shutdown

[0171] Control the third solenoid valve, the fourth solenoid valve and the fifth solenoid valve to close. Assume that the current liquid level of the first liquid supply tank is lower than the lower limit liquid level. Compare the pressure of the condenser and the pressure of the evaporator. If the pressure of the condenser is greater than the sum of the pressure of the evaporator and the pressure increment, control the first liquid replenishment pipeline and the first exhaust pipeline to be connected. At this time, the refrigerant is stored for the first liquid supply tank by relying on the pressure difference between the condenser and the evaporator. If the pressure of the condenser is less than or equal to the sum of the pressure of the evaporator and the pressure increment, it means that the pressure difference between the condenser and the evaporator is small. At this time, it is difficult to supply liquid to the liquid supply tank by relying on the pressure difference between the condenser and the evaporator. Since the liquid supply tanks are placed below the condenser and the evaporator, the control is connected to the first liquid storage pipeline and the first pressure balance pipeline, and the first liquid supply tank is supplied with liquid through the height difference and the principle of the communicating vessel. Optionally, the pressure increment is 50kPa. When the unit is shut down, the electric heating element is not started.

[0172] Assuming that the current liquid level of the second liquid supply tank is lower than the lower limit level, referring to the above logic, based on the pressure of the condenser and the pressure of the evaporator, the second liquid replenishment pipeline, the second exhaust pipeline, the second liquid storage pipeline and the second pressure balance pipeline are controlled to be on and off, so that the second liquid supply tank can store refrigerant. No further details are given here.

[0173] Phase 4: Crew preparation

[0174] At this time, it is necessary to establish a bearing pressure differential to make the rotor suspended. Therefore, at this time, the liquid levels of the two liquid supply tanks are judged, and the liquid supply tank with the highest liquid level and a liquid level greater than is determined as the target liquid supply tank. The heating element in the target liquid supply tank is controlled to turn on. For example, if the liquid level of the first liquid supply tank is higher than the liquid level of the second liquid supply tank, the first heating element is controlled to turn on. At the same time, the valve corresponding to the liquid supply tank is controlled to close. After the suspension pressure differential is established, the compressor enters the startup operation state, that is, it operates according to the control logic of stage 1.

[0175] Combination Figure 8 As shown, the embodiment of the present disclosure provides a liquid supply device 80 for an air suspension unit, comprising: an acquisition module 81, a determination module 82 and a liquid supply module 83. The acquisition module 81 is configured to acquire the operating state of the air suspension unit. The determination module 82 is configured to determine the target liquid supply object according to the operating state of the air suspension unit. The liquid supply module 83 is configured to supply liquid to the target liquid supply object according to the liquid supply scheme corresponding to the target liquid supply object.

[0176] The liquid supply device for the air suspension unit provided by the embodiment of the present disclosure is used to determine the target liquid supply object based on the operating state of the air suspension unit, and then match the liquid supply scheme corresponding to the target liquid supply object, and supply liquid to the target liquid supply object according to the liquid supply scheme. The target liquid supply object includes a bearing and two liquid supply tanks. The liquid outlet sides of the two liquid supply tanks are both connected to the liquid inlet side of the bearing of the compressor. In this way, a suitable liquid supply scheme can be selected for liquid supply based on the target liquid supply object. Moreover, when the target liquid supply object is a liquid supply tank, the pressure difference between the condenser and the evaporator can be used to supply liquid to the two liquid supply tanks. In this way, even if a gear pump is not used, a stable liquid supply source can be guaranteed, and problems such as aging and failure of the gear pump can be avoided.

[0177] Combination Fig. 9 As shown, the embodiment of the present disclosure provides a liquid supply device 90 for an air suspension unit, including a processor 91 and a memory 92. Optionally, the device may also include a communication interface 93 and a bus 94. The processor 91, the communication interface 93, and the memory 92 may communicate with each other through the bus 94. The communication interface 93 may be used for information transmission. The processor 91 may call the logic instructions in the memory 92 to execute the liquid supply method for the air suspension unit of the above embodiment.

[0178] In addition, the logic instructions in the memory 92 described above can be implemented in the form of software functional units and can be stored in a computer-readable storage medium when sold or used as an independent product.

[0179] The memory 92 is a computer-readable storage medium that can be used to store software programs and computer executable programs, such as program instructions / modules corresponding to the method in the embodiment of the present disclosure. The processor 91 executes the function application and data processing by running the program instructions / modules stored in the memory 92, that is, the liquid supply method for the air suspension unit in the above embodiment is realized.

[0180] The memory 92 may include a program storage area and a data storage area, wherein the program storage area may store an operating system and an application required for at least one function; the data storage area may store data created according to the use of the terminal device, etc. In addition, the memory 92 may include a high-speed random access memory and may also include a non-volatile memory.

[0181] Combination Fig.10 As shown, the embodiment of the present disclosure provides an air suspension unit 100, including: an air suspension unit body, and the above-mentioned liquid supply device 80 (90) for the air suspension unit. The liquid supply device 80 (90) for the air suspension unit is installed in the air suspension unit body. The installation relationship described here is not limited to placement inside the product, but also includes installation connections with other components of the product, including but not limited to physical connection, electrical connection or signal transmission connection, etc. It can be understood by those skilled in the art that the liquid supply device 80 (90) for the air suspension unit can be adapted to a feasible product body, thereby realizing other feasible embodiments.

[0182] The embodiment of the present disclosure provides a computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are configured to execute the above-mentioned liquid supply method for an air suspension unit.

[0183] The computer-readable storage medium mentioned above may be a transient computer-readable storage medium or a non-transitory computer-readable storage medium.

[0184] The technical solution of the embodiment of the present disclosure can be embodied in the form of a software product, which is stored in a storage medium and includes one or more instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in the embodiment of the present disclosure. The aforementioned storage medium may be a non-transient storage medium, including: a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and other media that can store program codes, or a transient storage medium.

[0185] The above description and the accompanying drawings fully illustrate the embodiments of the present disclosure so that those skilled in the art can practice them. Other embodiments may include structural, logical, electrical, process and other changes. The embodiments represent only possible changes. Unless explicitly required, separate components and functions are optional, and the order of operation may vary. The parts and features of some embodiments may be included in or replace the parts and features of other embodiments. Moreover, the words used in this application are only used to describe the embodiments and are not used to limit the claims. As used in the description of the embodiments and the claims, unless the context clearly indicates, the singular forms of "a", "an" and "the" are intended to include plural forms as well. Similarly, the term "and / or" as used in this application refers to any and all possible combinations of listings containing one or more associated ones. In addition, when used in the present application, the term "comprise" and its variants "comprises" and / or comprising refer to the presence of stated features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or groups thereof. In the absence of further restrictions, the elements defined by the sentence "comprising a ..." do not exclude the presence of other identical elements in the process, method or device comprising the elements. In this article, each embodiment may focus on the differences from other embodiments, and the same and similar parts between the various embodiments may refer to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method part disclosed in the embodiments, then the relevant parts can refer to the description of the method part.

[0186] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software may depend on the specific application and design constraints of the technical solution. The technicians may use different methods for each specific application to implement the described functions, but such implementations should not be considered to exceed the scope of the embodiments of the present disclosure. The technicians may clearly understand that, for the convenience and simplicity of description, the specific working processes of the systems, devices and units described above may refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here.

[0187] In the embodiments disclosed herein, the disclosed methods and products (including but not limited to devices, equipment, etc.) can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units can be only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between each other shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms. The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to implement this embodiment. In addition, each functional unit in the embodiment of the present disclosure may be integrated in a processing unit, or each unit may exist physically alone, or two or more units may be integrated in one unit.

[0188] The flowchart and block diagram in the accompanying drawings show the possible architecture, function and operation of the system, method and computer program product according to the embodiment of the present disclosure. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of the code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. In some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, which can depend on the functions involved. In the description corresponding to the flowchart and the block diagram in the accompanying drawings, the operations or steps corresponding to different boxes can also occur in a different order from the order disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, which can depend on the functions involved. Each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, may be implemented by a dedicated hardware-based system that performs the specified functions or actions, or may be implemented by a combination of dedicated hardware and computer instructions.

Claims

1. A liquid supply method for an air suspension unit, characterized in that: The air suspension unit includes: a condenser, an evaporator and a liquid supply system; the liquid supply system includes: two liquid supply tanks; wherein the liquid outlet side of the condenser and the liquid outlet sides of the two liquid supply tanks are both connected to the liquid inlet side of the bearing of the compressor to supply liquid to the bearing; the liquid outlet side of the condenser is connected to the liquid inlet side of the two liquid supply tanks, and the pressure difference between the condenser and the evaporator can be used to supply liquid to the two liquid supply tanks; The liquid supply method comprises: Get the operating status of the air suspension unit; Determine the target liquid supply object according to the operating status of the air suspension unit; The target liquid supply object is supplied with liquid according to the liquid supply scheme corresponding to the target liquid supply object.

2. The liquid supply method according to claim 1, characterized in that: The step of determining the target liquid supply object according to the operating state of the air suspension unit includes: When the operation state of the air suspension unit is startup or shutdown, the target liquid supply object is determined to be the liquid supply tank; When the operating state of the air suspension unit is in operation, the target liquid supply objects are determined to be the bearing and the liquid supply tank.

3. The liquid supply method according to claim 1, characterized in that: The step of supplying liquid to the target liquid supply object according to the liquid supply scheme corresponding to the target liquid supply object comprises: When the target liquid supply object is a liquid supply tank, a corresponding liquid supply scheme is selected to supply liquid to the liquid supply tank according to the operating state of the air suspension unit; When the target fluid supply objects are the bearing and the fluid supply tank, a fluid supply scheme corresponding to the bearing and the fluid supply tank is selected to supply fluid to the bearing and the fluid supply tank.

4. The liquid supply method according to claim 3, characterized in that: The method of selecting a corresponding liquid supply scheme for liquid supply from a liquid supply tank according to the operating state of the air suspension unit comprises: When the operation state of the air suspension unit is startup or shutdown, a liquid supply tank whose liquid level is lower than the lower limit liquid level is determined as a target liquid supply tank; Controlling the condenser and / or the evaporator to supply liquid to the target liquid supply tank; When the liquid level of the target liquid supply tank reaches the upper limit liquid level, the heat exchanger corresponding to the target liquid supply tank is controlled to stop supplying liquid.

5. The liquid supply method according to claim 4, characterized in that: The liquid outlet sides of the condenser and the evaporator are respectively connected to two liquid supply tanks through two liquid storage pipelines, and the tops of the two liquid supply tanks are respectively connected to two pressure balance pipelines; When the operation state of the air suspension unit is turned on, controlling the condenser and / or the evaporator to supply liquid to the target liquid supply tank includes: Controlling the conduction of the liquid storage pipeline corresponding to the target liquid supply tank; and, According to the difference between the pressure of the target liquid supply tank and the pressure of the compressor chamber, the on-off of the pressure balance pipeline corresponding to the target liquid supply tank is controlled.

6. The liquid supply method according to claim 4, characterized in that: The liquid outlet side of the condenser is connected to the two liquid supply tanks through two liquid replenishment pipelines, and the tops of the two liquid supply tanks are connected to the two exhaust pipelines; and the liquid outlet sides of the condenser and the evaporator are connected to the two liquid supply tanks through two liquid storage pipelines, and the tops of the two liquid supply tanks are connected to the two pressure balance pipelines; wherein the conduction pressure of the liquid replenishment pipeline is greater than the conduction pressure of the liquid storage pipeline; and the conduction pressure of the exhaust pipeline is greater than the conduction pressure of the pressure balance pipeline; When the operation state of the air suspension unit is shutdown, controlling the condenser and / or the evaporator to supply liquid to the target liquid supply tank includes: Calculate the pressure difference between the condenser and the evaporator; When the pressure difference is greater than the pressure difference threshold, the liquid replenishment pipeline and the exhaust pipeline corresponding to the target liquid supply tank are controlled to be connected; When the pressure difference is less than or equal to the pressure difference threshold, the liquid storage pipeline and the pressure balance pipeline corresponding to the target liquid supply tank are controlled to be connected.

7. The liquid supply method according to claim 3, characterized in that: In the case where the target liquid supply object is a bearing and a liquid supply tank, selecting a liquid supply scheme corresponding to the bearing as bearing liquid supply includes: Calculate the pressure difference between the condenser pressure and the compressor cavity pressure; When the pressure difference is within the preset suspension pressure difference range, the condenser is controlled to supply liquid to the bearing; When the pressure difference is less than the lower limit of the preset suspension pressure difference range, the two liquid supply tanks are controlled to supply liquid to the bearing alternately; and the condenser is controlled to supply liquid to the non-working liquid supply tank; wherein the non-working liquid supply tank is a liquid supply tank that does not supply liquid to the bearing.

8. The liquid supply method according to claim 7, characterized in that: Heating elements are provided in the two liquid supply tanks; the tops of the two liquid supply tanks are respectively connected to two exhaust pipelines; In the case where the target liquid supply object is a bearing and a liquid supply tank, selecting a liquid supply scheme corresponding to the bearing as bearing liquid supply also includes: When the condenser is controlled to supply liquid to the bearing, the liquid supply tank with the highest liquid level is determined as the target liquid supply tank; Controlling the activation of a heating element in a target liquid supply tank; According to the difference between the pressure of the target liquid supply tank and the pressure of the compressor chamber, the on-off of the exhaust pipeline corresponding to the target liquid supply tank is controlled.

9. The liquid supply method according to claim 7, characterized in that: Heating elements are arranged in both liquid supply tanks; the liquid outlet sides of the two liquid supply tanks are connected to the liquid inlet side of the bearing through two liquid discharge pipelines respectively; The controlling of the two fluid supply tanks to alternately supply fluid to the bearing comprises: When the liquid level in the working liquid supply tank reaches the lower limit liquid level, the heating element of the non-working liquid supply tank is controlled to turn on; When ΔPw is within the preset suspension pressure difference range, the liquid supply tank in operation is controlled to exit the operation state; Control the drainage pipeline corresponding to the non-operating liquid supply tank to be open; Among them, the working fluid supply tank is the fluid supply tank that is supplying fluid to the bearing, and the non-working fluid supply tank is the fluid supply tank that is not supplying fluid to the bearing; ΔPw is the pressure difference between the pressure of the non-working fluid supply tank after entering the working state and the pressure of the compressor cavity.

10. The liquid supply method according to claim 3, characterized in that: The liquid outlet side of the condenser is connected to the liquid inlet sides of the two liquid supply tanks through two liquid replenishment pipelines; In the case where the target liquid supply objects are the bearing and the liquid supply tank, selecting the liquid supply scheme corresponding to the liquid supply tank as liquid supply from the liquid supply tank includes: Control the conduction of the liquid replenishment pipeline corresponding to the non-operating liquid supply tank; When the liquid level of the non-operating liquid supply tank reaches the upper limit liquid level, the corresponding liquid replenishing pipeline is controlled to be disconnected.

11. The liquid supply method according to claim 10, characterized in that: The tops of the two liquid supply tanks are respectively connected to two exhaust pipelines; In the case where the control of the liquid replenishing pipeline corresponding to the non-operating liquid supply tank is connected, the liquid supply scheme corresponding to the liquid supply tank is selected as liquid supply by the liquid supply tank, and further includes: Obtain the pressure difference between the non-operating fluid supply tank and the compressor cavity; The on / off of the exhaust pipeline corresponding to the non-operating liquid supply tank is controlled according to the pressure difference.

12. The liquid supply method according to claim 11, characterized in that: Heating elements are provided in both liquid supply tanks; the operating state of the air suspension unit includes: the on / off state of the air suspension unit and the operating state of the compressor; After obtaining the operating status of the air suspension unit, the method further includes: When the unit is started and the compressor enters the pre-startup preparation stage, the liquid supply tank with the highest liquid level is determined as the target liquid supply tank; Control the heating element in the target liquid supply tank to turn on.

13. A liquid supply device for an air suspension unit, comprising a processor and a memory storing program instructions, characterized in that: The processor is configured to execute the liquid supply method for an air suspension unit according to any one of claims 1 to 12 when running the program instructions.

14. An air suspension unit, characterized in that: include: The main body of the air suspension unit includes: a condenser, an evaporator and a liquid supply system; The liquid supply system includes: two liquid supply tanks; wherein the liquid outlet side of the condenser and the liquid outlet sides of the two liquid supply tanks are both connected to the liquid inlet side of the bearing of the compressor to supply liquid to the bearing; the liquid outlet side of the condenser is connected to the liquid inlet side of the two liquid supply tanks, and the pressure difference between the condenser and the evaporator is used to supply liquid to the two liquid supply tanks; and, The liquid supply device for an air suspension unit according to claim 13 is installed on the air suspension unit body.

15. A storage medium storing program instructions, characterized in that: When the program instructions are executed, the liquid supply method for an air suspension unit according to any one of claims 1 to 12 is executed.

Images