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

Abstract

The application discloses a liquid supply method for a gas suspension unit, the gas suspension unit comprising a condenser, an evaporator and a liquid supply system; the liquid supply system comprising two liquid supply tanks; wherein the liquid outlet sides of the two liquid supply tanks are connected to the liquid inlet sides of the bearings of the compressor to supply liquid to the bearings; the liquid outlet side of the condenser is connected to the liquid inlet sides of the two liquid supply tanks, and the two liquid supply tanks are supplied with liquid by using the pressure difference between the condenser and the evaporator; the liquid supply method comprising: obtaining the running state of the gas suspension unit; determining a target liquid supply object according to the running state of the gas suspension unit; and supplying liquid to the target liquid supply object according to a liquid supply scheme corresponding to the target liquid supply object. In this way, a suitable liquid supply scheme can be selected for liquid supply based on the target liquid supply object. The two liquid supply tanks are supplied with liquid by using the pressure difference between the condenser and the evaporator, so that a stable liquid supply source is ensured. The application also discloses a liquid supply device for a gas suspension unit, a gas suspension unit and a storage medium.

Description

Technical Field

[0001] This application relates to the field of air suspension unit technology, such as a liquid supply method, liquid supply device, air suspension unit and storage medium for an air suspension unit. Background Technology

[0002] The working principle of a hydrostatic air suspension bearing is as follows: Liquid refrigerant is delivered to the porous hydrostatic air suspension bearing, discharged from the bearing, and collected in the motor cavity. It then returns to the evaporator along with the refrigerant used to cool the motor. The pressure difference between the refrigerant entering and exiting the bearing generates buoyancy, providing stable suspension for the compressor rotor. This pressure difference is called the suspension pressure difference, ΔP = P (supply tank pressure) - P (cavity pressure). Maintaining the suspension pressure difference within a suitable range is one of the key factors ensuring 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 disposed in the refrigerant circulation loop; a liquid supply tank, provided with a liquid outlet connected to the compressor, the liquid supply tank being provided with a heating element for heating the liquid refrigerant in the liquid supply tank so that the liquid refrigerant in the liquid supply tank flows into the compressor to provide liquid refrigerant to the compressor bearings; a connecting pipeline, one end of which is connected to the refrigerant circulation loop and the other end of which is connected to the liquid supply tank; and a gear pump disposed in the connecting pipeline, capable of drawing refrigerant from the refrigerant circulation loop and sending it into the liquid supply tank.

[0004] In the process of implementing the embodiments of this disclosure, at least the following problems were found in the related art:

[0005] The relevant technology uses a gear pump to extract liquid refrigerant to replenish the liquid refrigerant supply tank. This requires the gear pump to work under all operating conditions, which accelerates the aging of the gear pump and makes it prone to failure.

[0006] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this application, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0007] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

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

[0009] In some embodiments, the liquid supply method for the air suspension unit includes an air suspension unit comprising a condenser, an evaporator, and a liquid supply system. The liquid supply system includes two liquid supply tanks, wherein the outlet side of each of the two liquid supply tanks is connected to the inlet side of the compressor bearing to supply liquid to the bearing; the outlet side of the condenser is connected to the inlet side of the two liquid supply tanks, and liquid is supplied to the two liquid supply tanks using the pressure difference between the condenser and the evaporator; the liquid supply method includes: acquiring the operating status of the air suspension unit; determining a target liquid supply object based on the operating status of the air suspension unit; wherein the target liquid supply object is the bearing and the two liquid supply tanks, or one or both of the two liquid supply tanks; and supplying liquid to the target liquid supply object according to a 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, the processor being configured to execute the aforementioned liquid supply method for the air suspension unit when the program instructions are executed.

[0011] In some embodiments, the air suspension unit includes: an air suspension unit body, including: a condenser and a liquid supply system; the liquid supply system includes: two liquid supply tanks; wherein the outlet side of each of the two liquid supply tanks is connected to the inlet side of the compressor bearing to supply liquid to the bearing; the outlet side of the condenser is connected to the inlet side of the two liquid supply tanks to supply liquid to the two liquid supply tanks; and, a liquid supply device for the air suspension unit as described above is installed on the air suspension unit body.

[0012] In some embodiments, the storage medium stores program instructions that, when executed, perform the aforementioned liquid supply method for an air suspension unit.

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

[0014] The target liquid supply object is determined based on the operating status of the air suspension unit, and a corresponding liquid supply scheme is then matched and supplied to the target liquid supply object according to the scheme. The target liquid supply object includes the bearing and two liquid supply tanks. The outlet side of both liquid supply tanks is connected to the inlet side of the compressor bearing. This allows for the selection of a suitable liquid supply scheme based on the target liquid supply object. Furthermore, when the target liquid supply object is a liquid supply tank, the pressure difference between the condenser and evaporator can be used to supply liquid to both tanks. Thus, a stable liquid supply source can be guaranteed even without using a gear pump, avoiding problems such as gear pump aging and failure.

[0015] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0016] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein:

[0017] Figure 1 This is a schematic diagram of the structure of an air suspension unit provided in an embodiment of this disclosure;

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

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

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

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

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

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

[0024] Figure 8 This is a schematic diagram of another liquid supply method for an air suspension unit provided in an embodiment of this disclosure;

[0025] Figure 9 This is a schematic diagram of another liquid supply method for an air suspension unit provided in an embodiment of this disclosure;

[0026] Figure 10 This is a schematic diagram of a liquid supply device for an air suspension unit provided in an embodiment of this disclosure;

[0027] Figure 11 This is a schematic diagram of another liquid supply device for an air suspension unit provided in an embodiment of this disclosure;

[0028] Figure 12 This is a schematic diagram of an air suspension unit provided in an embodiment of this disclosure.

[0029] Figure label:

[0030] 1. Refrigerant circulation loop; 101. Bypass pipe; 102. Motor cooling pipe; 2. Compressor; 3. Condenser; 4. Evaporator; 5. Liquid supply system; 501. First liquid supply tank; 5011. First liquid inlet; 5012. First exhaust port; 5013. First drain port; 5014. First heating element; 502. Second liquid supply tank; 5021. Second liquid inlet; 5022. Second exhaust port; 5023. Second drain port; 5024. Second heating element; 503. First liquid inlet pipe; 504. First exhaust pipe; 505. First drain pipe; 506. Second liquid inlet pipe; 507. Second exhaust pipe; 508. Second drain pipe; 509. Third liquid inlet pipe; 510. Fourth liquid inlet pipe; 511. First pressure balancing pipe; 512. Second pressure balancing pipe. Detailed Implementation

[0031] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0032] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this disclosure described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0033] Unless otherwise stated, the term "multiple" means two or more.

[0034] In this embodiment of the disclosure, the character " / " indicates that the objects before and after it are in an "or" relationship. For example, A / B means: A or B.

[0035] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0036] The term "correspondence" can refer to an association or binding relationship. The correspondence between A and B means that there is an association or binding relationship between A and B.

[0037] Combination Figure 1-4As shown, this embodiment of the present disclosure provides an air-suspension chiller unit, including a refrigerant circulation loop 1, a compressor 2, a condenser 3, an evaporator 4, and a liquid supply system 5. The compressor 2, condenser 3, and evaporator 4 are disposed in the refrigerant circulation loop, and the liquid supply system 5 is used to provide liquid refrigerant to the bearings of the compressor 2. Through the cooperation of various structures and the phase change of the refrigerant, the air-suspension chiller unit can achieve cooling / heating.

[0038] In some embodiments, the air-suspension unit further includes a bypass line 101 and a motor cooling line 102. The bypass line 101 connects the condenser 3 and the evaporator 4, and is equipped with a bypass electronic expansion valve. The motor cooling line 102 connects the condenser 3 and the compressor cavity, and is equipped with a motor cooling electronic expansion valve. The bypass line 101, equipped with the bypass electronic expansion valve, is used for start-up and shutdown, high-pressure ratio control, and low-load unloading bypass. Through the motor cooling line 102, the refrigerant in the condenser 3 enters the compressor cavity via 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 remains within a reasonable range.

[0039] In some embodiments, combined with Figure 2 As shown, the liquid supply system includes two liquid supply tanks. Each liquid supply tank is equipped with an inlet, an outlet, and a drain. The inlet can be connected to the condenser 3, the outlet can be connected to the evaporator 4, and the drain can be connected to the liquid inlet side of the bearing. Each liquid supply tank is equipped with a heating element.

[0040] During normal compressor operation, one supply tank provides liquid refrigerant to the bearing, while the other supply tank stores liquid refrigerant. The two supply tanks alternately supply liquid refrigerant to the bearing. When the supply tank is supplying liquid refrigerant to the bearing, the inlet and outlet ports are sealed, while the outlet port is open. The heating element heats the liquid refrigerant in the supply tank to maintain a pressure difference between the supply tank and the compressor cavity. This pressure difference allows the liquid refrigerant in the supply tank to flow through the outlet port to the inlet side of the bearing. When the supply tank is storing liquid refrigerant, the inlet and outlet ports are open, while the outlet port is sealed. The pressure difference between the condenser 3 and the evaporator 4 allows the liquid refrigerant in the condenser 3 to enter and be stored in the supply tank.

[0041] When the liquid refrigerant supply tank provides liquid refrigerant to the bearing, the drain port is open to connect the supply tank to the bearing's inlet side; the inlet and outlet ports are sealed to maintain a relatively sealed state in the supply tank, and the pressure in the supply tank is increased by heating with the heating element; under the pressure difference between the supply tank and the compressor, the liquid refrigerant in the supply tank flows to the bearing's inlet side. When the liquid refrigerant is stored in the supply tank, the inlet and outlet ports are open to connect the supply tank to the evaporator 4 and the condenser 3; during normal compressor operation, the pressure in the evaporator 4 is greater than the pressure in the condenser 3, and under the pressure difference between the evaporator 4 and the condenser 3, the liquid refrigerant in the evaporator 4 flows into and is stored in the supply tank. During normal compressor operation, one supply tank provides liquid refrigerant to the bearing, while the other supply tank stores liquid refrigerant; the two supply tanks alternately supply liquid refrigerant to the bearing, maintaining the stable suspension of the compressor rotor. The air suspension unit provided in this embodiment utilizes the pressure difference between the condenser 3 and the evaporator 4 to replenish the liquid refrigerant in the supply tank. Unlike related technologies, it does not require a gear pump, which not only saves energy but also avoids problems such as gear pump aging and failure.

[0042] The two liquid supply tanks are the first liquid supply tank 501 and the second liquid supply tank 502.

[0043] The first liquid supply tank 501 is constructed with a first liquid inlet 5011, a first vent 5012, and a first drain 5013. The first liquid inlet 5011 can communicate with the condenser 3, the first vent 5012 can communicate with the evaporator 4, and the first drain 5013 can communicate with the liquid inlet side of the bearing. A first heating element 5014 is provided in the first liquid supply tank 501. When the first liquid supply tank supplies liquid refrigerant to the bearing, the first liquid inlet and the first vent are sealed, and the first drain is open. The first heating element heats the liquid refrigerant in the first liquid supply tank to maintain the pressure difference between the first liquid supply tank and the compressor. The pressure difference is used to allow the liquid refrigerant in the first liquid supply tank to flow to the liquid inlet side of the bearing through the first drain. When the first liquid supply tank stores liquid refrigerant, the first liquid inlet and the first vent are open, and the first drain is sealed. 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.

[0044] The second liquid supply tank 502 is constructed with a second liquid inlet 5021, a second vent 5022, and a second drain 5023. The second liquid inlet 5021 can communicate with the condenser 3, the second vent 5022 can communicate with the evaporator 4, and the second drain 5023 can communicate with the liquid inlet side of the bearing. A second heating element 5024 is installed in the second liquid supply tank 502. When the second liquid supply tank supplies liquid refrigerant to the bearing, the second liquid inlet and second vent are sealed, and the second drain is open. The second heating element heats the liquid refrigerant in the second liquid supply tank to maintain the pressure difference between the second liquid supply tank and the compressor. This pressure difference allows the liquid refrigerant in the second liquid supply tank to flow through the second drain to the liquid inlet side of the bearing. When the second liquid supply tank stores liquid refrigerant, the second liquid inlet and second vent are open, and the second drain is sealed. The pressure difference between the condenser 3 and the evaporator 4 allows the liquid refrigerant in the condenser 3 to enter and be stored in the second liquid supply tank.

[0045] During normal operation of the compressor, the first liquid supply tank 501 provides liquid refrigerant to the bearings, while the second liquid supply tank 502 stores liquid refrigerant; alternatively, the second liquid supply tank 502 provides liquid refrigerant to the bearings, while the first liquid supply tank 501 stores liquid refrigerant. When preset conditions are met, the functions of the first liquid supply tank 501 and the second liquid supply tank 502 are interchanged, alternately providing liquid refrigerant to the bearings to maintain stable levitation of the compressor rotor.

[0046] In some embodiments, combined with Figure 2 The air suspension unit also includes: two replenishment lines, namely a first replenishment line and a second replenishment line, which can be controlled to be connected or disconnected; and two drain lines, namely a first drain line and a second drain line. The liquid outlet side of the condenser is connected to the first inlet 5011 of the first liquid supply tank 501 via the first replenishment line. The liquid outlet side of the first liquid supply tank 501 is connected to the bearing side of the compressor via the first drain line. The liquid outlet side of the condenser is also connected to the second inlet 5021 of the second liquid supply tank 502 via the second replenishment line. The liquid outlet side of the second liquid supply tank 502 is connected to the bearing side of the compressor via the second drain line.

[0047] The air suspension unit also includes two bypass pressure relief lines, namely a first bypass pressure relief line and a second bypass pressure relief line, which can be controlled to be opened or closed. The top of the first liquid supply tank 501 is connected to the evaporator through the first bypass pressure relief line. The top of the second liquid supply tank 502 is connected to the evaporator through the second bypass pressure relief line.

[0048] The first replenishment pipeline includes: a first inlet pipe 503. The first bypass pressure relief pipeline includes: a first venting pipeline. The first venting pipeline includes: a first venting pipe 504. The first drain pipeline includes: a first draining pipe 505.

[0049] Optionally, the first liquid inlet pipe 503 connects the condenser 3 and the first liquid inlet 5011, and the first liquid inlet pipe 503 is equipped with a first solenoid valve. The first liquid inlet pipe 503 connects the condenser 3 and the first liquid inlet 5011 of the first liquid supply tank 501, thereby introducing the refrigerant from the condenser 3 into the first liquid supply tank 501. The first solenoid valve facilitates the control of opening or closing the first liquid inlet pipe 503.

[0050] Optionally, the first liquid inlet pipe 503 is also equipped with a one-way valve. The one-way valve can limit the flow of refrigerant in the first liquid inlet pipe 503 from the condenser 3 to the first liquid supply tank 501. This setting can prevent refrigerant backflow and improve the reliability of the liquid supply system.

[0051] Optionally, the first liquid inlet pipe 503 is connected to the bottom of the condenser 3, which facilitates the extraction of liquid refrigerant from the condenser 3.

[0052] Optionally, the first exhaust pipe 504 connects to the first exhaust port 5012 and the evaporator 4, and the first exhaust pipe 504 is equipped with a first electronic expansion valve. The first exhaust pipe 504 connects the first liquid supply tank 501 to the evaporator 4, thus facilitating the use of the pressure difference between the condenser and the evaporator to force the refrigerant in the condenser into the first liquid supply tank, replenishing the first liquid supply tank 501 with liquid refrigerant. The first electronic expansion valve allows for easy control of whether the first exhaust pipe 504 is connected or blocked.

[0053] Optionally, the first exhaust pipe 504 is connected to the top of the evaporator 4, so as to make the gas pressure in the first liquid supply tank 501 consistent with the gas pressure in the evaporator 4.

[0054] Optionally, the first end of the first drain pipe 505 is connected to the first drain port 5013, and the second end is connected to the liquid inlet side of the bearing. The first drain pipe 505 is equipped with a first check valve, which limits the flow of refrigerant from the first end of the first drain pipe 505 to the second end of the first drain pipe 505. By providing the first drain pipe 505, the first liquid supply tank 501 can supply liquid refrigerant to the bearing. By providing the first check valve, refrigerant backflow can be prevented, improving the reliability of the liquid supply system.

[0055] Understandably, a certain pressure is required for the check valve to open. When the first liquid supply tank 501 supplies liquid to the inlet side of the bearing, the gas pressure in the first liquid supply tank 501 is relatively high, which can force the liquid refrigerant into the first drain pipe 505 and open the first check valve. When the first liquid supply tank 501 stores liquid refrigerant, the gas pressure in the first liquid supply tank is equal to the gas pressure in the evaporator 4. The gas pressure in the first liquid supply tank 501 is relatively low, and the first check valve is in the closed state.

[0056] In some embodiments, the first vent 5012 is located at the top of the first liquid supply tank 501. This arrangement prevents liquid refrigerant from being discharged through the first vent 5012.

[0057] In some embodiments, the first drain port 5013 and the first inlet port 5011 are located at the bottom of the first supply tank 501. Positioning the first inlet port 5011 at the bottom of the first supply tank 501 prevents refrigerant splashing. When supplying refrigerant using the first supply tank 501, the first heating element 5014 heats the liquid refrigerant in the first supply tank 501. The evaporation of the liquid refrigerant increases the gas pressure at the top of the first supply tank 501, and under this gas pressure, the liquid refrigerant flows out through the first drain port 5013. Therefore, by positioning the first drain port 5013 at the bottom of the first supply tank 501, more liquid refrigerant can be discharged.

[0058] In some embodiments, the second replenishment line includes a second inlet pipe 506. The second bypass pressure relief line includes a second vent line. The second vent line includes a second vent pipe 507. The second drain line includes a second drain pipe 508.

[0059] Optionally, the second liquid inlet pipe 506 is connected to the condenser 3 and the second liquid inlet 5021, and the second liquid inlet pipe 506 is equipped with a second solenoid valve. The second liquid inlet pipe 506 connects the condenser 3 and the second liquid inlet 5021 of the second liquid supply tank 502, thereby introducing the refrigerant from the condenser 3 into the second liquid supply tank 502. The second solenoid valve facilitates the control of opening or closing the second liquid inlet pipe 506.

[0060] Optionally, the second liquid inlet pipe 506 is connected to the bottom of the condenser 3, which facilitates the extraction of liquid refrigerant from the condenser 3.

[0061] Optionally, the second inlet pipe 506 is also equipped with a one-way valve. The one-way valve can limit the flow of refrigerant in the second inlet pipe 506 from the condenser 3 to the second supply tank 502. This configuration can prevent refrigerant backflow and improve the reliability of the supply system.

[0062] Optionally, the second exhaust pipe 507 connects to the second exhaust port 5022 and the evaporator 4, and the second exhaust pipe 507 is equipped with a second electronic expansion valve. The second exhaust pipe 507 connects the second liquid supply tank 502 to the evaporator 4, thus facilitating the use of the pressure difference between the condenser and the evaporator to force the refrigerant in the condenser into the second liquid supply tank 502, replenishing the second liquid supply tank 502 with liquid refrigerant. The second electronic expansion valve allows for easy control of whether the second exhaust pipe 507 is connected or blocked.

[0063] Optionally, the second exhaust pipe 507 is connected to the top of the evaporator 4, so as to make the gas pressure in the second liquid supply tank 502 consistent with the gas pressure in the evaporator 4.

[0064] Optionally, the first end of the second drain pipe 508 is connected to the second drain port, and the second end of the second drain pipe 508 is connected to the liquid inlet side of the bearing. The second drain pipe 508 is equipped with a second one-way valve, which limits the flow of refrigerant from the first end to the second end of the second drain pipe 508. By providing the second drain pipe 508, the second liquid supply tank 502 can supply liquid refrigerant to the bearing. The second one-way valve can prevent refrigerant backflow and improve the reliability of the liquid supply system.

[0065] In some embodiments, the second vent 5022 is located at the top of the second liquid supply tank 502. This arrangement prevents liquid refrigerant from being discharged through the second vent 5022.

[0066] In some embodiments, the second drain port 5023 and the second inlet port 5021 are disposed at the bottom of the second supply tank 502. Disposing the second inlet port 5021 at the bottom of the second supply tank 502 prevents refrigerant splashing. When supplying refrigerant using the second supply tank 502, the second heating element 5024 heats the liquid refrigerant in the second supply tank 502. The evaporation of the liquid refrigerant increases the gas pressure at the top of the second supply tank 502, and under the action of the gas pressure, the liquid refrigerant flows out through the second drain port 5023. Therefore, by disposing the second drain port 5023 at the bottom of the second supply tank 502, more liquid refrigerant can be discharged.

[0067] 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 drain port. This arrangement prevents the heating element from burning dry, ensuring that the heating element is always immersed in liquid refrigerant.

[0068] In some embodiments, a liquid level sensor is provided in the supply tank. This facilitates the measurement of the liquid refrigerant level in the supply tank.

[0069] In some embodiments, a pressure sensor is provided in the supply tank. This arrangement facilitates the measurement of the gas pressure in the supply tank.

[0070] In some embodiments, a safety valve is provided on the top of the supply tank. This configuration allows for pressure relief via the safety valve when the gas pressure in the supply tank becomes too high, thereby improving the safety of the supply tank.

[0071] In some embodiments, the liquid supply tank is positioned below the height of the evaporator 4 and the condenser 3. This facilitates the flow of liquid refrigerant from the evaporator 4 and the condenser 3 into the liquid supply tank under the influence of gravity.

[0072] Optionally, the air suspension unit further includes two liquid storage lines, namely a first liquid storage line and a second liquid storage line, which can be controlled to be connected or disconnected. 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 line. 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 line.

[0073] Optionally, the first liquid storage line includes a third liquid inlet pipe 509. The second liquid storage line includes a fourth liquid inlet pipe 510.

[0074] The bypass pressure relief line also includes a first pressure balancing line and a second pressure balancing line. The conduction pressure of the exhaust line is greater than the conduction pressure of the pressure balancing line. The first pressure balancing line includes: a first pressure balancing pipe 511; the second pressure balancing line includes: a second pressure balancing pipe 512.

[0075] Optionally, the third liquid inlet pipe 509 connects to the condenser 3 and the first liquid supply tank 501, and the third liquid inlet pipe 509 is equipped with a first ball valve. The fourth liquid inlet pipe 510 connects to the evaporator 4 and the second liquid supply tank 502, and the fourth liquid inlet pipe 510 is equipped with a second ball valve. The first end of the first pressure balancing pipe 511 is connected to the evaporator 4, and the second end is connected to the second liquid supply tank 502, and the first pressure balancing pipe 511 is equipped with a third ball valve. The first end of the second pressure balancing pipe 512 is connected to the first pressure balancing pipe 511, and the second end of the second pressure balancing pipe 512 is connected to the first liquid supply tank 501. The connection position between the second pressure balancing pipe 512 and the first pressure balancing pipe 511 is located upstream of the location of the third ball valve. When the compressor is stopped, if the liquid refrigerant in the first liquid supply tank 501 is too low, the first ball valve and the third ball valve open to replenish the liquid refrigerant in the first liquid supply tank using the condenser 3. When the liquid refrigerant in the second liquid supply tank 502 is too low, the first ball valve and the third ball valve open to replenish the liquid refrigerant in the second liquid supply tank 502 using the evaporator 4.

[0076] When the unit is shut down and the compressor is stopped, a suitable amount of refrigerant needs to be stored in the supply tank for the next startup. This storage is achieved by controlling the states of the first, second, and third ball valves. When the liquid refrigerant in the first supply tank 501 is too low, the first and third ball valves open, connecting the first supply tank to the evaporator and condenser. At this time, refrigerant is stored in the first supply tank 501 based on the pressure difference between the condenser and evaporator and / or gravity flow; that is, refrigerant from the condenser flows into and is stored in the first supply tank 501. When the liquid refrigerant in the first supply tank 501 is too high, the first and third ball valves close. When the liquid refrigerant in the second supply tank 502 is too low, the second and third ball valves open, connecting the second supply tank to the evaporator. At this time, refrigerant is stored in the second supply tank 502 based on gravity flow; that is, refrigerant from the evaporator flows into and is stored in the second supply tank 502. When there is a large amount of liquid refrigerant in the second liquid supply tank 502, close the second ball valve and the third ball valve.

[0077] In some embodiments, the first liquid supply tank is further provided with a third liquid inlet, and a third liquid inlet pipe is connected to the first liquid supply tank through the third liquid inlet. The second liquid supply tank is further provided with a fourth liquid inlet, and a fourth liquid inlet pipe is connected to the second liquid supply tank through the fourth liquid inlet. This arrangement facilitates the layout and connection of pipelines.

[0078] In some embodiments, the third liquid inlet pipe 509 is connected to the bottom of the condenser 3; the fourth liquid inlet pipe 510 is connected to the bottom of the evaporator 4; the first end of the first pressure balancing pipe 511 is connected to the top of the evaporator, and the second end is connected to the top of the second liquid supply tank 502, and the first pressure balancing pipe 511 is equipped with a third ball valve. The first end of the second pressure balancing pipe 512 is connected to the first pressure balancing pipe 511, and the second end of the second pressure balancing pipe 512 is connected to the top of the first liquid supply tank 501. Thus, when the compressor is stopped, it facilitates the flow of liquid refrigerant from the condenser 3 into the first liquid supply tank 501, and the flow of liquid refrigerant from the evaporator 4 into the second liquid supply tank 502.

[0079] Each liquid supply tank is equipped with multiple liquid levels, including: an upper limit liquid level, a third preset liquid level, a second preset liquid level, a lower limit liquid level, and a first preset liquid level, with the set height decreasing sequentially.

[0080] Combination Figure 5 As shown in the figure, this disclosure provides a liquid supply method for an air suspension unit, including:

[0081] S501, the air suspension unit obtains its operating status.

[0082] S502, the air suspension unit determines the target liquid supply object based on its operating status.

[0083] 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.

[0084] The system acquires the operating status of the air suspension unit, such as its on / off status, compressor operating status, condenser pressure, and evaporator pressure, among other things. Based on the air suspension unit's operating status, the target liquid supply objects are determined. These target liquid supply objects include the bearings, the first liquid supply tank, and the second liquid supply tank. The control unit operates according to the liquid supply scheme corresponding to the target liquid supply objects to supply liquid to them.

[0085] The liquid supply method for air-suspension units provided in this disclosure determines the target liquid supply object based on the operating status of the air-suspension unit, then matches a liquid supply scheme corresponding to the target liquid supply object, and supplies 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 outlet side of both liquid supply tanks is connected to the inlet side of the compressor bearing, thus allowing for the selection of a suitable liquid supply scheme based on the target liquid supply object. Furthermore, when the target liquid supply object is a liquid supply tank, the pressure difference between the condenser and evaporator can be used to supply liquid to both liquid supply tanks. Therefore, even without using a gear pump, a stable liquid supply source can be guaranteed, avoiding problems such as gear pump aging and failure.

[0086] Optionally, in step S502, the air suspension unit determines the target liquid supply object based on its operating status, including:

[0087] When the air suspension unit is started and the compressor is running normally, the target liquid supply object is determined based on the pressure of the condenser.

[0088] When the air suspension unit is shut down and the compressor is stopped, the target liquid supply object is determined to be the liquid supply tank that meets the preset conditions.

[0089] When the unit is started and the compressor is running normally, it needs to supply refrigerant to the bearings using the refrigerant supply tank. However, as the refrigerant supply continues, the amount of refrigerant in the tank gradually decreases, necessitating the use of the condenser to supply refrigerant to the supply tank. Since there are two supply tanks, the specific tank to be supplied can be determined based on the condenser pressure; that is, the target refrigerant supply is determined by the condenser pressure.

[0090] When the unit is shut down and the compressor stops, the target liquid supply object is determined to be the liquid supply tank that meets the preset conditions. In this way, after supplying liquid to the target liquid supply object, it can be guaranteed that the liquid level in both liquid supply tanks can meet the normal operation requirements after the unit is started.

[0091] Optionally, the preset condition is that the liquid level in the supply tank is lower than a third preset liquid level. The third preset liquid level is the allowable heating liquid level at startup. When the liquid level in the supply tank is lower than the third preset liquid level, it indicates that the liquid level in the supply tank is low and cannot supply liquid to the bearings normally. Therefore, the preset condition is set to the liquid level in the supply tank being lower than the third preset liquid level. In this way, when the unit is shut down and the compressor stops, the supply tank with a liquid level lower than the third preset liquid level is identified as the target liquid supply object, and liquid is supplied to the supply tank before the unit is restarted next time, so that the supply tank stores enough refrigerant to meet the normal operation requirements after the unit is started.

[0092] Optionally, the air suspension unit determines the target liquid supply object based on the condenser pressure, including:

[0093] When the pressure in the condenser of the air suspension unit is greater than the pressure in the evaporator, the target liquid supply objects are determined to be the bearing and the two liquid supply tanks.

[0094] If the pressure of the condenser of the air suspension unit is greater than the pressure threshold, and the pressure ratio of the air suspension unit is greater than the pressure ratio threshold, then the target liquid supply objects are determined to be the bearing and the liquid supply tank in operation; where the liquid supply tank in operation is the liquid supply tank that is supplying liquid to the bearing.

[0095] If the condenser pressure is greater than the evaporator pressure, it means that the pressure difference between the condenser and evaporator can supply liquid to the liquid supply tank. When the liquid level in one supply tank drops to a point where it can no longer provide a pressure difference to the bearing, it is necessary to switch to the other supply tank. Therefore, the target liquid supply objects include both supply tanks. Since the compressor is currently running, the target liquid supply objects also include the bearing.

[0096] When the condenser pressure exceeds the pressure threshold, if the pressure ratio of the air suspension unit is greater than the pressure ratio threshold (i.e., if the pressure ratio is large), it indicates that the pressure difference between the condenser and the supply tank can be used to directly supply liquid to the supply tank, which is currently supplying liquid to the bearing. Therefore, the target liquid supply object is determined to be the operating supply tank. Optionally, the pressure threshold is the sum of the pressure of the operating supply tank and the first pressure increment. The first pressure increment can be set according to actual needs, for example, 50 kPa.

[0097] Combination Figure 6 As shown in the embodiments of this disclosure, another liquid supply method for an air suspension unit is provided, including:

[0098] S501, the air suspension unit obtains its operating status.

[0099] S502, the air suspension unit determines the target liquid supply object based on its operating status.

[0100] S513, when the target liquid supply object is the bearing and two liquid supply tanks, the air suspension unit controls the two liquid supply tanks to alternately supply liquid to the bearing; and controls the condenser to supply liquid to the non-working liquid supply tanks; wherein the non-working liquid supply tanks are the liquid supply tanks that do not supply liquid to the bearings.

[0101] When the fluid supply is for a bearing and there are two fluid supply tanks, the two tanks are controlled to alternately supply fluid to the bearing. This ensures that the fluid supply system provides a continuous and stable suspension pressure differential for the bearing. As the operating fluid supply tank continuously supplies fluid to the bearing, its level will gradually decrease. When it drops to a certain level, it can no longer provide a suspension pressure differential for the bearing, at which point it is necessary to switch to the other fluid supply tank. Therefore, when the operating fluid supply tank is supplying fluid to the bearing, the condenser is controlled to supply fluid to the non-operating fluid supply tank. This prepares for switching the fluid supply from the other tank.

[0102] When the liquid supply tank in operation supplies liquid to the bearing, the one-way valve on its corresponding drain pipe is opened by the refrigerant, allowing the liquid to enter the bearing.

[0103] Optionally, in step S513, the air suspension unit controls the two liquid supply tanks to alternately supply liquid to the bearing, including:

[0104] The air suspension unit obtains the liquid level in the supply tank during operation.

[0105] When the liquid level reaches the first preset level, the air suspension unit controls the heating element of the non-working liquid supply tank to turn on, so that the non-working liquid supply tank enters the working state.

[0106] When ΔPw > ΔPg, the air suspension unit controls the heating element in the previously operating liquid supply tank to shut down, so that the corresponding liquid supply tank exits the working state.

[0107] Wherein, ΔPw is the pressure difference between the pressure of the non-working liquid supply tank after entering the working state and the pressure of the compressor cavity, and ΔPg is the pressure difference between the pressure of the liquid supply tank when it was working and the pressure of the compressor cavity.

[0108] The liquid level of the operating supply tank is obtained through a liquid level sensor. When the liquid level reaches the first preset level, it indicates that the liquid level of the operating supply tank is too low, and another supply tank needs to prepare to supply liquid. The heating element in the non-operating supply tank is then activated to increase its refrigerant pressure, bringing it into operation. Simultaneously, the pressure difference ΔPw between the non-operating supply tank and the compressor cavity pressure after entering operation, and the pressure difference ΔPg between the operating supply tank and the compressor cavity pressure, are acquired in real time. If ΔPw > ΔPg, it indicates that the other supply tank has entered bearing liquid supply mode. At this time, the one-way valve on the drain pipe corresponding to the other supply tank will be opened by the refrigerant, while the one-way valve on the drain pipe corresponding to the operating supply tank will be closed. Therefore, the heating element in the operating supply tank is turned off, causing the corresponding supply tank to exit operation mode. The other supply tank is then used to supply liquid to the bearing. Simultaneously, the condenser is controlled to supply liquid to the non-operating supply tank, putting it into refrigerant storage mode. By performing this cycle repeatedly, the bearing suspension and liquid supply requirements during normal compressor operation can be met.

[0109] Optionally, in step S513, the air suspension unit controls the condenser to supply liquid to the non-operational liquid supply tank, including:

[0110] The air suspension unit controls the connection of the replenishment pipeline corresponding to the non-operational supply tank.

[0111] When the liquid level in the non-operational liquid supply tank reaches the upper limit, the air suspension unit controls the corresponding replenishment pipeline to disconnect.

[0112] The system controls the connection of the replenishment line corresponding to the non-operational supply tank. Specifically, it controls the opening of the solenoid valve on the inlet pipe corresponding to the non-operational supply tank, storing refrigerant based on the pressure difference between the condenser and evaporator. When the liquid level in the non-operational supply tank reaches the upper limit, indicating that the refrigerant has been fully stored, the system then controls the disconnection of the corresponding replenishment line, specifically by closing the solenoid valve on the corresponding inlet pipe.

[0113] Optionally, in step S513, the air suspension unit controls the condenser to supply liquid to the non-operational liquid supply tank, including:

[0114] The air suspension unit controls the connection of the replenishment pipeline corresponding to the non-operational supply tank.

[0115] The air suspension unit obtains the pressure difference between the non-operating liquid supply tank and the compressor cavity.

[0116] The air suspension unit controls the opening or closing of the bypass pressure relief pipeline based on the pressure difference.

[0117] When the liquid level in the non-operational liquid supply tank reaches the upper limit, the air suspension unit controls the corresponding replenishment pipeline to disconnect.

[0118] After the replenishment line corresponding to the non-operational supply tank is opened, refrigerant from the condenser flows into the non-operational supply tank, causing the pressure inside the tank to increase. To provide a suitable suspension pressure differential for the bearings and ensure the pressure in the supply tank remains within a safe range, it is necessary to depressurize the supply tank when necessary. Therefore, the pressure of the non-operational supply tank is obtained through a pressure sensor, and the pressure difference between it and the compressor cavity pressure is calculated. The opening or closing of the bypass pressure relief line is controlled based on the pressure difference.

[0119] Specifically, if the pressure difference exceeds the sum of the preset upper limit of the suspension pressure difference range and the second pressure increment, the bypass pressure relief line is opened to release pressure. Specifically, the electronic expansion valve on the exhaust pipe corresponding to the non-operating supply tank is opened. Since the flow rate of the electronic expansion valve is relatively small, opening the electronic expansion valve, i.e., opening the exhaust pipe, can accurately maintain the pressure inside the tank. Optionally, the second pressure increment can be set according to actual needs, for example, 20 kPa. If the pressure difference is less than the difference between the preset upper limit of the suspension pressure difference range and the first pressure reduction, the bypass pressure relief line is disconnected to stop pressure release. Specifically, the electronic expansion valve on the exhaust pipe corresponding to the non-operating supply tank is closed. Optionally, the first pressure reduction can be set according to actual needs, for example, 10 kPa.

[0120] Combination Figure 7 As shown in the embodiments of this disclosure, another liquid supply method for an air suspension unit is provided, including:

[0121] S501, the air suspension unit obtains its operating status.

[0122] S502, the air suspension unit determines the target liquid supply object based on its operating status.

[0123] S513, when the target liquid supply object is the bearing and two liquid supply tanks, the air suspension unit controls the two liquid supply tanks to alternately supply liquid to the bearing; and controls the condenser to supply liquid to the non-working liquid supply tanks; wherein the non-working liquid supply tanks are the liquid supply tanks that do not supply liquid to the bearings.

[0124] S523, when the target liquid supply object is the working liquid supply tank, if the liquid level of the working liquid supply tank is lower than the second preset liquid level, the air suspension unit controls the liquid replenishment pipeline corresponding to the working liquid supply tank to be opened.

[0125] S533: When the liquid level in the supply tank of the air suspension unit reaches the upper limit during operation, the corresponding replenishment pipeline will be disconnected.

[0126] When the target liquid supply object is the operating liquid supply tank, the liquid level of the operating liquid supply tank is acquired in real time. When the liquid level is lower than the second preset liquid level, it indicates that liquid needs to be supplied to the operating liquid supply tank. The corresponding replenishment pipeline to the operating liquid supply tank is then opened to allow the condenser to supply liquid to the operating liquid supply tank. Specifically, the solenoid valve on the inlet pipe corresponding to the operating liquid supply tank is opened. Because the opening resistance of the solenoid valve is relatively large, controlling the opening of the solenoid valve allows for precise control of the amount of liquid replenished to the liquid supply tank. When the liquid level of the operating liquid supply tank reaches the upper limit, it indicates that refrigerant compensation is complete, and the corresponding replenishment pipeline is then disconnected. In this way, storing refrigerant in the operating liquid supply tank reduces the operating frequency and operating time of the heating element in the other liquid supply tank, thereby reducing the wear and tear on the heating element.

[0127] Combination Figure 8 As shown in the embodiments of this disclosure, another liquid supply method for an air suspension unit is provided, including:

[0128] S501, the air suspension unit obtains its operating status.

[0129] S502, the air suspension unit determines the target liquid supply object based on its operating status.

[0130] S513, when the target liquid supply object is the bearing and two liquid supply tanks, the air suspension unit controls the two liquid supply tanks to alternately supply liquid to the bearing; and controls the condenser to supply liquid to the non-working liquid supply tanks; wherein the non-working liquid supply tanks are the liquid supply tanks that do not supply liquid to the bearings.

[0131] S523, when the target liquid supply object is the working liquid supply tank, if the liquid level of the working liquid supply tank is lower than the second preset liquid level, the air suspension unit controls the liquid replenishment pipeline corresponding to the working liquid supply tank to be opened.

[0132] S533: When the liquid level in the supply tank of the air suspension unit reaches the upper limit during operation, the corresponding replenishment pipeline will be disconnected.

[0133] S543, when the target liquid supply object is a liquid supply tank that meets preset conditions, the air suspension unit controls the connection of the liquid storage pipeline and bypass pressure relief pipeline corresponding to the liquid supply tank that meets the preset conditions, so as to supply liquid to the liquid supply tank that meets the preset conditions.

[0134] S553, when the liquid level in the supply tank reaches the upper limit level under preset conditions, the air suspension unit controls the corresponding liquid storage pipeline and bypass pressure relief pipeline to disconnect.

[0135] When the unit is shut down and the compressor stops, the target refrigerant supply is the refrigerant tank that meets the preset conditions, specifically, the refrigerant tank with a level lower than the third preset level. At this time, the refrigerant level in this tank is low, requiring refrigerant replenishment to prepare for the unit's next startup. Therefore, the corresponding liquid storage line and bypass pressure relief line can be opened to supply refrigerant and relieve pressure in this tank. Specifically, the ball valve on the inlet pipe corresponding to this tank is opened. Since the unit is currently shut down, the refrigerant pressure is not very high, making it easier for refrigerant to enter the tank. Simultaneously, the bypass pressure relief line is opened to relieve pressure in the tank. When the refrigerant level in the tank reaches the upper limit, indicating that refrigerant replenishment is complete, the corresponding liquid storage line and bypass pressure relief line are then disconnected.

[0136] Optionally, in step S543, the bypass pressure relief pipeline corresponding to the liquid supply tank that meets the preset conditions is connected by the air suspension unit control, including:

[0137] The pressure difference between the condenser and evaporator of the air suspension unit is calculated.

[0138] When the pressure difference of the air suspension unit exceeds the pressure difference threshold, the corresponding exhaust pipeline is opened.

[0139] When the pressure difference is less than or equal to the pressure difference threshold, the air suspension unit controls the pressure balance pipeline to be open.

[0140] The pressure of the condenser and evaporator is acquired by pressure sensors, and the pressure difference between them is calculated. If the pressure difference is greater than the pressure difference threshold, the vent pipe corresponding to the liquid supply tank is opened. This means the electronic expansion valve on the vent pipe corresponding to the liquid supply tank opens. At this time, because the pressure difference between the condenser and evaporator is large, the opening pressure difference of the electronic expansion valve is met, which is beneficial for precise pressure relief. If the pressure difference is less than or equal to the pressure difference threshold, the pressure balancing pipe is opened, meaning the third ball valve on the first pressure balancing pipe opens. At this time, because the pressure difference between the condenser and evaporator is small, the opening pressure difference of the ball valve is met. Thus, by controlling the opening of appropriate pipes based on the pressure difference between the condenser and evaporator for pressure relief, the effectiveness and accuracy of pressure relief can be guaranteed.

[0141] Combination Figure 9 As shown in the embodiments of this disclosure, another liquid supply method for an air suspension unit is provided, including:

[0142] S501, the air suspension unit obtains its operating status.

[0143] S502, the air suspension unit determines the target liquid supply object based on its operating status.

[0144] 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.

[0145] S504: After executing S501, when the air suspension unit is started and the compressor enters the pre-start preparation stage, the liquid supply tank with the highest liquid level and the liquid level is greater than the third preset liquid level is identified as the target liquid supply tank.

[0146] S505, the air suspension unit controls the heating element in the target liquid supply tank to turn on.

[0147] If the unit is started and the compressor enters the pre-start preparation stage, the liquid supply tank with the highest liquid level (greater than a third preset level) is designated as the target liquid supply tank. The heating element inside the target liquid supply tank is activated. Simultaneously, the corresponding valve is closed. The heating element enters its working state, and after the suspension pressure differential is established, the compressor enters the start-up operation state. This method selects the liquid supply tank with relatively more liquid as the target liquid supply tank and activates its internal heating element to put it into operation. This prevents insufficient refrigerant in the liquid supply tank from hindering the establishment of the suspension pressure differential.

[0148] The following example illustrates the specific implementation process of the liquid supply method for air suspension units provided in this disclosure:

[0149] In order to support the suspension of the bearing, the pressure difference between the liquid supply pressure in the liquid supply tank and the pressure in the compressor cavity, i.e., the supply pressure differential, needs to be within the preset suspension pressure differential range.

[0150] Phase 1: The unit is started up, and the compressor is running normally.

[0151] Assume that the first liquid supply tank is currently used for bearing suspension liquid supply.

[0152] Scenario 1: If the condenser pressure is greater than the evaporator pressure, the refrigerant can be stored in the supply tank based on the pressure difference between the condenser and evaporator. The control is as follows: The first heating element is allowed to operate. Based on the pressure difference between the pressure in the first supply tank and the compressor cavity, the switching on and off of the first heating element is controlled: when the pressure difference is less than the lower limit of the preset floating pressure difference range, the first heating element is turned on. When the pressure difference is greater than the upper limit of the preset floating pressure difference range, the first heating element is turned off. This maintains the supply pressure difference of the first supply tank within the preset floating pressure difference range. The switching on and off of the first heating element is controlled cyclically in this way. Optionally, the upper limit of the preset floating pressure difference range is 650 kPa, and the lower limit is 450 kPa.

[0153] At this time, the second solenoid valve is opened, and the second refrigerant supply tank stores refrigerant based on the pressure difference between the condenser and evaporator. The refrigerant flows from the condenser, passing through the second solenoid valve and a check valve before entering the second refrigerant supply tank, relying on the pressure difference between the condenser and evaporator. During the refrigerant storage process in the second refrigerant supply tank, the pressure difference between the second refrigerant supply tank and the compressor cavity is calculated in real time. If the pressure difference is greater than the sum of the preset upper limit of the floating pressure difference range and the second pressure increment, the second electronic expansion valve is opened, thereby controlling the second exhaust pipe to open and depressurize the second refrigerant supply tank. If the pressure difference is less than the difference between the preset upper limit of the floating pressure difference range and the first pressure reduction, the second electronic expansion valve is closed.

[0154] As the liquid level in the second supply tank rises, when it exceeds the upper limit, it indicates that the second supply tank has stored enough refrigerant. At this point, the second solenoid valve and the second electronic expansion valve simultaneously close. This controls the second supply tank to store refrigerant. The prerequisite for executing the refrigerant storage logic is that the heating element of the corresponding supply tank is in the off state.

[0155] The refrigerant level in the first refrigerant supply tank gradually decreases as it supplies refrigerant to the bearings. When the level reaches the first preset level, it indicates that the refrigerant level in the first supply tank is very low, and the second supply tank needs to be switched to supply refrigerant for bearing suspension. At this time, the second heating element in the second supply tank is turned on, and the second supply tank exits the refrigerant storage state. The first pressure difference between the first supply tank and the compressor cavity, and the second pressure difference between the second supply tank and the compressor cavity are calculated in real time. When the second pressure difference is greater than the first pressure difference, it indicates that the second supply tank has entered the bearing supply state. At this time, the second one-way valve on the second drain pipe is opened, and the first one-way valve on the first drain pipe is closed. The first heating element is turned off. The second supply tank is then used to supply refrigerant to the bearings. Simultaneously, the first supply tank is controlled to enter the refrigerant storage state, the specific control logic of the second supply tank storing refrigerant can be referred to. In this way, through this cyclical execution, the bearing suspension refrigerant supply requirements during normal compressor operation can be met.

[0156] Scenario 2: If the unit's pressure ratio is greater than the pressure ratio threshold, and the condenser pressure is greater than the sum of the pressure of the first liquid supply tank and the first pressure increment, then liquid can be directly supplied to the first liquid supply tank based on the pressure difference between the condenser and the first liquid supply tank. The logic is as follows: When the liquid level in the first liquid supply tank is lower than the second preset liquid level, the first solenoid valve is opened, thereby controlling the first liquid inlet pipe to open. Refrigerant is forced into the first liquid supply tank. When the liquid level in the first liquid supply tank rises to the upper limit liquid level, the first solenoid valve is closed.

[0157] Phase 2: Unit shutdown, compressor has stopped running.

[0158] The unit is currently shut down. To prepare for the next startup, refrigerant needs to be stored in the supply tank. The supply tank with the highest liquid level but below the third preset level is designated as the target supply tank. Assuming the target supply tank is the first supply tank, the first ball valve is opened, which in turn opens the third inlet pipe, allowing the first supply tank to store refrigerant. At this point, refrigerant is stored in the first supply tank based on the pressure difference between the condenser and evaporator and the principle of gravity (if the supply tank is below the condenser and evaporator), or if there is no pressure difference between the condenser and evaporator, only the principle of gravity is used. Simultaneously, the pressure difference between the condenser and evaporator is calculated. If the pressure difference is greater than the pressure difference threshold, the first electronic expansion valve is opened, thus opening the first exhaust pipe. If the pressure difference is less than or equal to the pressure difference threshold, the third ball valve is opened. When the liquid level in the first supply tank is higher than the upper limit level, the first ball valve is closed.

[0159] If the target liquid supply tank is the second liquid supply tank, the control logic is the same as described above.

[0160] Phase 3: Unit startup, compressor enters pre-start preparation phase.

[0161] At this point, a pressure differential needs to be established in the bearing supply to suspend the rotor. Therefore, the liquid levels of the two supply tanks are compared, and the supply tank with the highest liquid level, which is greater than the third preset level, is designated as the target supply tank. The heating element in the target supply tank is then activated, putting that supply tank into operation. Simultaneously, the corresponding valve of that supply tank is closed. Once the suspension pressure differential is established, the compressor starts running.

[0162] Combination Figure 10 As shown in the illustration, this disclosure provides a liquid supply device 100 for an air suspension unit, including: an acquisition module 110, a determination module 120, and a liquid supply module 130. The acquisition module 110 is configured to acquire the operating status of the air suspension unit. The determination module 120 is configured to determine a target liquid supply object based on the operating status of the air suspension unit. The liquid supply module 130 is configured to supply liquid to the target liquid supply object according to a liquid supply scheme corresponding to the target liquid supply object.

[0163] The liquid supply device for an air-suspension unit provided in this disclosure determines the target liquid supply object based on the operating status of the air-suspension unit, then matches a liquid supply scheme corresponding to the target liquid supply object, and supplies 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 outlet side of both liquid supply tanks is connected to the inlet side of the compressor bearing, thus allowing for the selection of a suitable liquid supply scheme based on the target liquid supply object. Furthermore, when the target liquid supply object is a liquid supply tank, the pressure difference between the condenser and evaporator can be used to supply liquid to both liquid supply tanks. Therefore, even without using a gear pump, a stable liquid supply source can be guaranteed, avoiding problems such as gear pump aging and failure.

[0164] Combination Figure 11 As shown, this embodiment of the present disclosure provides a liquid supply device 1100 for an air-suspension unit, including a processor 111 and a memory 112. Optionally, the device may further include a communication interface 113 and a bus 114. The processor 111, communication interface 113, and memory 112 can communicate with each other via the bus 114. The communication interface 113 can be used for information transmission. The processor 111 can call logical instructions in the memory 112 to execute the liquid supply method for the air-suspension unit described in the above embodiment.

[0165] Furthermore, the logical instructions in the aforementioned memory 112 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium.

[0166] The memory 112, as a computer-readable storage medium, can be used to store software programs and computer-executable programs, such as program instructions / modules corresponding to the methods in the embodiments of this disclosure. The processor 111 executes functional applications and data processing by running the program instructions / modules stored in the memory 112, that is, it implements the liquid supply method for the air suspension unit in the above embodiments.

[0167] The memory 112 may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created based on the use of the terminal device. Furthermore, the memory 112 may include high-speed random access memory and may also include non-volatile memory.

[0168] Combination Figure 12 As shown, this disclosure provides an air suspension unit 1200, including: an air suspension unit body, and the aforementioned liquid supply device 100 (1100) for the air suspension unit, which is installed on the air suspension unit body. The installation relationship described herein is not limited to placement within the product, but also includes installation connections with other components of the product, including but not limited to physical connections, electrical connections, or signal transmission connections. Those skilled in the art will understand that the liquid supply device 100 (1100) for the air suspension unit can be adapted to feasible product bodies to achieve other feasible embodiments.

[0169] This disclosure provides a computer-readable storage medium storing computer-executable instructions configured to perform the above-described liquid supply method for an air suspension unit.

[0170] The aforementioned computer-readable storage medium may be a transient computer-readable storage medium or a non-transitory computer-readable storage medium.

[0171] The technical solutions of this disclosure can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes one or more instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in this disclosure. The aforementioned storage medium can be a non-transitory storage medium, including: a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and other media capable of storing program code; it can also be a transient storage medium.

[0172] The foregoing description and accompanying drawings fully illustrate embodiments of this disclosure to enable those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, procedural, and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the terminology used in this application is for describing embodiments only and is not intended to limit the claims. As used in the description of embodiments and claims, the singular forms “a,” “an,” and “the” are intended to equally include the plural forms unless the context clearly indicates otherwise. Similarly, the term “and / or” as used in this application means including one or more of the associated listed items and all possible combinations thereof. Additionally, when used in this application, the term "comprise" and its variations "comprises" and / or "comprising" refer to the presence of stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof. Without further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the process, method, or apparatus that includes said element. In this document, each embodiment may focus on the differences from other embodiments, and similar or identical parts between embodiments can be referred to mutually. For methods, products, etc., disclosed in the embodiments, if they correspond to the method section disclosed in the embodiments, the relevant parts can be referred to the description of the method section.

[0173] Those skilled in the art will recognize that the units and algorithm steps of the various examples 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 implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the embodiments of this disclosure. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0174] The methods and products (including but not limited to devices and equipment) disclosed in the embodiments herein can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For instance, the division of units may be merely a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the shown or discussed units may be through some interfaces, and the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units may be selected to implement this embodiment according to actual needs. Furthermore, the functional units in the embodiments of this disclosure may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0175] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to embodiments of this disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than that shown in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks may also occur in a different order than disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. Each block in a block diagram and / or flowchart, and combinations of blocks in a block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

Claims

1. A method for supplying liquid to an air suspension unit, characterized in that, 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 sides of the two liquid supply tanks are connected to the liquid inlet sides of the bearings of the compressor to supply liquid to the bearings; the exhaust ports of the two liquid supply tanks are connected to the evaporator; the liquid outlet side of the condenser is connected to the liquid inlet sides of the two liquid supply tanks, and the two liquid supply tanks can be supplied with liquid by using the pressure difference between the condenser and the evaporator; The liquid supply method comprises: obtaining the running state of the air suspension unit; the running state of the air suspension unit comprises the on-off state of the air suspension unit, the running state of the compressor and the pressure of the condenser; determining the target liquid supply object according to the running state of the air suspension unit; wherein, in the case that the unit is started and the compressor is normally running, the target liquid supply object is determined according to the pressure of the condenser; in the case that the unit is turned off and the compressor is stopped, the target liquid supply object is determined as the liquid supply tank satisfying the preset condition; the target liquid supply object is the bearings and the two liquid supply tanks, or one or both of the two liquid supply tanks; supplying liquid to the target liquid supply object according to the liquid supply scheme corresponding to the target liquid supply object; wherein, in the case that the target liquid supply object is the bearings and the two liquid supply tanks, the two liquid supply tanks are controlled to supply liquid to the bearings alternately; and the condenser is controlled to supply liquid to the non-working liquid supply tank; the non-working liquid supply tank is the liquid supply tank that does not supply liquid to the bearings.

2. The method of supplying liquid according to claim 1, wherein The target liquid supply object is determined according to the pressure of the condenser, comprising: in the case that the pressure of the condenser is greater than the pressure of the evaporator, the target liquid supply object is determined as the bearings and the two liquid supply tanks; in the case that the pressure of the condenser is greater than the pressure threshold, if the pressure ratio of the air suspension unit is greater than the pressure ratio threshold, the target liquid supply object is determined as the bearings and the working liquid supply tank; wherein, the working liquid supply tank is the liquid supply tank that is supplying liquid to the bearings.

3. The method of claim 1, wherein, The heating elements are arranged in the two liquid supply tanks; The two liquid supply tanks are controlled to supply liquid to the bearings alternately, comprising: obtaining the liquid level in the working liquid supply tank; in the case that the liquid level in the working liquid supply tank reaches the first preset liquid level, the heating element of the non-working liquid supply tank is turned on to make the non-working liquid supply tank enter the working state; In Pw> In the case of Pg, the heating element in the liquid supply tank that is currently in operation is controlled to be switched off, so that the corresponding liquid supply tank is taken out of operation. wherein, Pw is the pressure difference between the pressure of the non-operating liquid supply tank after entering the operating state and the pressure of the compressor cavity, Pg is the first pressure difference between the pressure of the originally operating liquid supply tank and the pressure of the compressor cavity.

4. The method of claim 1, wherein, The condenser is connected to the two liquid supply tanks through two liquid supplement pipelines; The condenser is controlled to supply liquid to the non-working liquid supply tank, comprising: controlling the liquid supplement pipeline corresponding to the non-working liquid supply tank to be connected; in the case that the liquid level of the non-working liquid supply tank reaches the upper limit liquid level, the corresponding liquid supplement pipeline is controlled to be disconnected.

5. The method of supplying liquid according to claim 4, wherein The top of the non-working liquid supply tank is connected to the evaporator through a bypass pressure relief pipeline; In the case that the liquid supplement pipeline corresponding to the non-working liquid supply tank is controlled to be connected, the condenser is controlled to supply liquid to the non-working liquid supply tank, further comprising: obtaining the second pressure difference between the non-working liquid supply tank and the compressor cavity; controlling the connection or disconnection of the bypass pressure relief pipeline according to the second pressure difference.

6. The method of claim 1, wherein, The target liquid supply object is the working liquid supply tank; the condenser is connected to the two liquid supply tanks through two liquid supplement pipelines; The target liquid supply object is the working liquid supply tank; the condenser is connected to the two liquid supply tanks through two liquid supplement pipelines; In a case where the liquid level of the working liquid supply tank is less than the second preset liquid level, the liquid supplement pipeline corresponding to the working liquid supply tank is controlled to be turned on; In a case where the liquid level of the working liquid supply tank reaches the upper limit liquid level, the corresponding liquid supplement pipeline is controlled to be turned off.

7. The method of claim 1, wherein, The target liquid supply object is a liquid supply tank satisfying the preset condition; the gas suspension unit further comprises an evaporator and a condenser, and the condenser and the evaporator are connected to the corresponding liquid supply tank through corresponding liquid storage pipelines; the top of each of the two liquid supply tanks is connected to the corresponding bypass pressure relief pipeline; The liquid supply method comprises the following steps: controlling the liquid storage pipeline and the bypass pressure relief pipeline corresponding to the liquid supply tank satisfying the preset condition to be turned on to supply liquid to the liquid supply tank satisfying the preset condition; In a case where the liquid level of the liquid supply tank satisfying the preset condition reaches the upper limit liquid level, the corresponding liquid storage pipeline and the bypass pressure relief pipeline are controlled to be turned off.

8. The method of supplying liquid according to claim 7, wherein The bypass pressure relief pipeline comprises an exhaust pipeline and a pressure balance pipeline, wherein the turn-on pressure of the exhaust pipeline is greater than the turn-on pressure of the pressure balance pipeline; The control of the bypass pressure relief pipeline corresponding to the liquid supply tank satisfying the preset condition comprises the following steps: calculating the pressure difference between the condenser and the evaporator; In a case where the pressure difference is greater than the pressure difference threshold, the corresponding exhaust pipeline is controlled to be turned on; In a case where the pressure difference is less than or equal to the pressure difference threshold, the pressure balance pipeline is controlled to be turned on.

9. The method of supplying liquid according to any one of claims 1 to 8, wherein Each of the two liquid supply tanks is provided with a heating element; the operating state of the gas suspension unit comprises the on-off state of the gas suspension unit and the operating state of the compressor; After the operating state of the gas suspension unit is obtained, the liquid supply method further comprises the following steps: In a case where the unit is turned on and the compressor enters the pre-start preparation stage, the liquid supply tank with the highest liquid level and greater than the third preset 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 be turned on.

10. 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 the gas suspension unit as claimed in any one of claims 1 to 9 when the program instructions are executed.

11. An air bearing assembly, characterized by, It comprises: The gas suspension unit body comprises a condenser and a liquid supply system; The liquid supply system comprises two liquid supply tanks; the liquid outlet side of each of the two liquid supply tanks is 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 each of the two liquid supply tanks to supply liquid to the two liquid supply tanks; and The liquid supply device for the gas suspension unit as claimed in claim 10 is installed in the gas suspension unit body.

12. A storage medium storing program instructions, characterized in that, The program instructions are executed to perform the liquid supply method for the gas suspension unit as claimed in any one of claims 1 to 9.

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