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; a liquid outlet side of the condenser and liquid outlet sides of the two liquid supply tanks are connected with a liquid inlet side of a bearing of a compressor to supply liquid to the bearing; the liquid outlet side of the condenser is connected with liquid inlet sides of the two liquid supply tanks to supply liquid to the two liquid supply tanks by using a pressure difference between the condenser and the evaporator; the liquid supply method comprising: obtaining an operating state of the gas suspension unit; determining a target liquid supply object according to the operating 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 based on the target liquid supply object to supply liquid. The pressure difference between the condenser and the evaporator is used to supply liquid to the two liquid supply tanks, thereby ensuring a stable liquid supply source. 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 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 compressor bearing 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, enabling liquid to be 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 the target liquid supply object based on the operating status of the air suspension unit; 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, 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 side of the two liquid supply tanks are both connected to the liquid inlet side of the compressor bearing 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 to supply liquid to the two liquid supply tanks using the pressure difference between the condenser and the evaporator; 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 a liquid supply device for an air suspension unit provided in an embodiment of this disclosure;

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

[0026] Figure 10 This is a schematic diagram of an air suspension unit provided in an embodiment of this disclosure.

[0027] Figure label:

[0028] 1. Refrigerant circulation loop; 101. Bypass pipe; 102. Motor cooling pipe; 2. Compressor; 3. Condenser; 4. Evaporator; 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; 512. First pressure balancing pipe; 511. Second pressure balancing pipe; 513. Condenser drain pipe. Detailed Implementation

[0029] 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.

[0030] 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.

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

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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, and an evaporator 4, wherein the compressor 2, condenser 3, and evaporator 4 are disposed in the refrigerant circulation loop. Through the coordination of the various structures of the air-suspension chiller unit and the phase change of the refrigerant, the air-suspension chiller unit can achieve cooling / heating.

[0036] Optionally, compressor 2 is equipped with bearings and a housing. Liquid refrigerant is delivered to a porous hydrostatic bearing, discharged from the bearing, and collected in the motor housing. It then returns to the evaporator along with the refrigerant used to cool the motor. The liquid refrigerant entering the bearing also serves as a level lubricant, and the reduced vaporization temperature of some of the liquid refrigerant helps cool the bearing. 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 (bearing inlet pressure) - P (housing pressure). The range of the suspension pressure difference is generally between 450 kPa and 650 kPa.

[0037] 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.

[0038] In some embodiments, combined with Figure 2 As shown, 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 equipped with a liquid inlet, a vent, and a drain. The liquid inlet can be connected to condenser 3, the vent can be connected to evaporator 4, and the drain can be connected to the liquid inlet side of the bearing. Condenser 3 or the liquid supply tanks provide liquid refrigerant to the bearing to suspend it.

[0039] When condenser 3 supplies liquid refrigerant to the bearing, condenser 3 is connected to the liquid inlet side of the bearing, and the drain port of the liquid supply tank is blocked. This allows the liquid refrigerant in condenser 3 to enter the liquid inlet side of the bearing by utilizing the pressure difference between condenser 3 and the machine cavity. When the liquid supply tank stores liquid refrigerant, the liquid inlet and outlet of the liquid supply tank are connected, and the drain port is blocked. This allows the liquid refrigerant in condenser 3 to enter and be stored in the liquid supply tank by utilizing the pressure difference between evaporator 4 and condenser 3.

[0040] The air-suspension unit provided in this embodiment utilizes a condenser 3 or a liquid supply tank to provide liquid refrigerant to the bearing, thereby suspending the bearing. The condenser 3 is connected to the liquid inlet side of the bearing. When the condenser 3 meets the liquid supply conditions, it can directly provide liquid refrigerant to the bearing, eliminating the need for a liquid storage tank and a gear pump to replenish it. When the liquid supply tank needs to store liquid refrigerant, its inlet and outlet are connected, while the outlet is blocked. During normal compressor operation, the pressure in the evaporator 4 is greater than the pressure in the condenser 3. Utilizing the pressure difference between the condenser 3 and the evaporator 4, the liquid refrigerant in the condenser 3 enters the liquid inlet side of the bearing, replenishing the liquid supply tank with liquid refrigerant. Again, unlike related technologies, there is no need for a gear pump to replenish the liquid supply tank, saving energy and avoiding problems such as gear pump aging and failure.

[0041] Optionally, each supply tank is equipped with a heating element. When the supply tank provides liquid refrigerant to the bearing, the inlet and outlet of the supply tank are sealed, while the outlet is open. The heating element is activated to adjust the pressure of the supply tank, thereby utilizing the pressure difference between the supply tank and the machine cavity to allow the liquid refrigerant in the supply tank to enter the inlet side of the bearing. With this configuration, when the supply tank provides liquid refrigerant to the bearing, the open outlet connects the supply tank to the inlet side of the bearing; the sealed inlet and outlet maintain a relatively sealed state; the heating element increases the pressure of the supply tank; and under the pressure difference between the supply tank and the machine cavity, the liquid refrigerant in the supply tank flows to the inlet side of the bearing.

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

[0043] For the first supply tank.

[0044] 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 be connected to the condenser 3, the first vent 5012 can be connected to the evaporator 4, and the first drain 5013 can be connected to 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 vent 5012 are blocked, and the first drain 5013 is open. 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. The pressure difference is used to make the liquid refrigerant in the first liquid supply tank flow to the liquid inlet side of the bearing through the first drain.

[0046] When the first liquid supply tank stores liquid refrigerant, the first liquid inlet and the first vent are open, and the first drain is blocked. The liquid refrigerant in the condenser 3 is allowed to enter and be stored in the first liquid supply tank by utilizing the pressure difference between the condenser 3 and the evaporator 4.

[0047] When condenser 3 supplies liquid refrigerant to the bearing, the pressure difference between the condenser and the machine cavity needs to be greater than or equal to a pressure threshold. If this pressure difference is lower than the pressure threshold, condenser 3 cannot meet the bearing's refrigerant supply requirements. To ensure stable bearing suspension, when condenser 3 fails to meet the refrigerant supply conditions, a refrigerant supply tank needs to seamlessly replace the condenser in supplying refrigerant to the bearing. Therefore, when condenser 3 supplies refrigerant to the bearing, at least one of the refrigerant supply tanks is in a standby refrigerant supply state.

[0048] When the first liquid supply tank is in the ready-to-supply state, the first inlet and the first outlet are sealed. 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 vent is opened to release pressure from the first liquid supply tank. This puts the first liquid supply tank in the ready-to-supply state.

[0049] For the second liquid supply tank 502.

[0050] 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 be connected to the condenser 3, the second vent 5022 can be connected to the evaporator 4, and the second drain 5023 can be connected to the liquid inlet side of the bearing. A second heating element 5024 is provided in the second liquid supply tank 502.

[0051] When the second liquid supply tank supplies liquid refrigerant to the bearing, the second liquid inlet and the second exhaust port are blocked, and the second liquid outlet 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. The pressure difference is used to make the liquid refrigerant in the second liquid supply tank flow to the liquid inlet side of the bearing through the second liquid outlet.

[0052] When the second liquid supply tank stores liquid refrigerant, the second liquid inlet and the second vent are open, and the second drain is blocked. 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 ready-to-supply state, the second inlet and the second outlet are blocked. 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 outlet is opened to release pressure from the second liquid supply tank. This puts the second liquid supply tank in the ready-to-supply state.

[0054] During normal compressor operation, when the pressure difference between the condenser and the compressor cavity is greater than or equal to the pressure threshold, condenser 3 supplies liquid refrigerant to the bearings. Simultaneously, one of the two liquid supply tanks is in a ready-to-supply state, while the other stores an appropriate amount of liquid refrigerant.

[0055] When the pressure difference between the condenser and the compressor cavity is less than a pressure threshold, the first liquid supply tank 501 supplies liquid refrigerant to the bearing, while the second liquid supply tank 502 stores liquid refrigerant; or, the second liquid supply tank 502 supplies liquid refrigerant to the bearing, 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 supplying liquid refrigerant to the bearing to maintain the compressor rotor's continuous and stable suspension.

[0056] 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.

[0057] There are two exhaust pipes, designated as the first exhaust pipe and the second exhaust pipe. The top of the first liquid supply tank is connected to the evaporator via the first exhaust pipe. The top of the second liquid supply tank is connected to the evaporator via the second exhaust pipe.

[0058] The first replenishment pipeline includes: a first inlet pipe 503. The first venting pipeline includes: a first venting pipe 504. The first draining pipeline includes: a first draining pipe 505.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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 fourth solenoid valve. By providing the first drain pipe 505, the first liquid supply tank 501 can supply liquid refrigerant to the bearing. By providing the fourth solenoid valve, the opening / closing of the first drain pipe 505 can be controlled.

[0065] 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.

[0066] 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.

[0067] In some embodiments, the second replenishment line includes a second inlet pipe 506. The air suspension unit further includes a second exhaust line. The second exhaust line includes a second exhaust pipe 507. The second drain line includes a second drain pipe 508. The second replenishment line, the second exhaust line, and the second drain line can all be controlled to be switched on or off.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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 fifth solenoid valve. By providing the second drain pipe 508, the second liquid supply tank 502 can supply liquid refrigerant to the bearing. The fifth solenoid valve can control the opening / closing of the second drain pipe 508.

[0074] 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.

[0075] 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.

[0076] In some embodiments, the condenser 3 is provided with a condenser drain port. The air suspension unit also includes a condenser drain pipe 513, which connects 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 supply liquid refrigerant to the bearing. By providing the third solenoid valve, the opening / closing of the condenser drain pipe 513 can be controlled.

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

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] There are two pressure balancing lines, designated as the first pressure balancing line and the second pressure balancing line. The top of the first supply tank is connected to the evaporator via the first pressure balancing line. The top of the second supply tank is connected to the evaporator via the second pressure balancing line. The conduction pressure of the exhaust line is greater than that of the pressure balancing line.

[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-bearing unit also includes a bypass line 101. The bypass line 101 connects to the condenser 3 and the evaporator 4 and is equipped with a bypass electronic expansion valve. A third liquid inlet pipe 509 connects to the condenser 3 and the first liquid supply tank 501 and is equipped with a first ball valve. A first pressure balancing pipe 512 connects to the first liquid supply tank 501 and the evaporator 4 and is equipped with a second ball valve. When the air-bearing unit is started, if the liquid refrigerant in the first liquid supply tank 501 is too low, the first ball valve, the second ball valve, and the bypass electronic expansion valve open to replenish the liquid refrigerant in the first liquid supply tank using the condenser 3 / evaporator 4.

[0087] When the bypass electronic expansion valve is opened, the gas pressure in the condenser 3 and the evaporator 4 is kept 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 gravity communication principle, 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 balancing pipe is connected to the top of the evaporator 4, and the second end of the first pressure balancing pipe is connected to the top of the first liquid supply tank. The connection of the third liquid inlet pipe 509 to the bottom of the condenser 3 facilitates the extraction of liquid refrigerant from the condenser 3. The connection of the first end of the first pressure balancing pipe 512 to the top of the evaporator 4, and the connection of the second end of the first pressure balancing pipe to the top of the first liquid supply tank, facilitates maintaining consistent gas pressure between the first liquid supply tank and the evaporator 4.

[0089] In some embodiments, the air-bearing unit further includes a fourth liquid inlet pipe 510 and a second pressure balancing pipe 511. The fourth liquid inlet pipe 510 is connected to the evaporator 4 and the second liquid supply tank 502, and is equipped with a third ball valve. The second pressure balancing pipe 511 is connected to the evaporator 4 and the second liquid supply tank 502, and is also equipped with a fourth ball valve. When the air-bearing unit is started, if the liquid refrigerant in the second liquid supply tank is too low, the third and fourth ball valves open to replenish the liquid refrigerant in the second liquid supply tank using the evaporator 4. With the third and fourth ball valves open, the second liquid supply tank is connected to the evaporator. At this time, refrigerant is stored in the second liquid supply tank 502 by gravity flow, meaning that 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 balancing pipe is connected to the top of the evaporator 4, and the second end of the second pressure balancing pipe is connected to the top of the second liquid supply tank. The fourth liquid inlet pipe 510 being connected to the bottom of the evaporator 4 facilitates the extraction of liquid refrigerant from the evaporator 4. The first end of the second pressure balancing pipe being connected to the top of the evaporator 4, and the second end of the second pressure balancing pipe being connected to the top of the second liquid supply tank, facilitates maintaining consistent gas pressure between the second liquid supply tank and the evaporator 4.

[0091] Combination Figure 5 As shown in the figure, this disclosure provides a liquid supply method for an air suspension unit, including:

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

[0093] S502, the air suspension unit determines the target liquid supply object based on 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 system acquires the operating status of the air suspension unit, such as its on / off status, condenser pressure, evaporator pressure, or one or more other parameters. Based on the 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.

[0096] 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.

[0097] Optionally, in step S502, the air suspension unit determines the target liquid supply object based on its operating status, including:

[0098] When the air suspension unit is in the start-up and stop-down 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 bearings and the liquid supply tank.

[0100] If the air suspension unit is running, it is necessary to ensure that the supply tank contains sufficient refrigerant to suspend the bearings. Therefore, the target for refrigerant supply is the supply tank. If the air suspension unit is shut down, it is necessary to ensure that the supply tank contains enough refrigerant for the unit's next startup. Therefore, the target for refrigerant supply is the supply tank.

[0101] The supply tank currently supplying fluid to the bearing is defined as the working supply tank, and the supply tank not supplying fluid to the bearing is defined as the non-working supply tank. If the air suspension unit is in operation, on the one hand, refrigerant needs to be supplied to the bearing to suspend it; on the other hand, when supplying fluid to the bearing using the supply tank, the refrigerant in the working supply tank is consumed as it supplies fluid to the bearing. When the liquid level drops to a certain level, fluid needs to be supplied to the bearing from another supply tank, while refrigerant is replenished in the supply tank. Therefore, the target fluid supply objects are determined to be the bearing and the supply tank.

[0102] Optionally, combined Figure 6 As shown in the figure, this disclosure provides a liquid supply method for an air suspension unit, including:

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

[0104] S502, the air suspension unit determines the target liquid supply object based on its operating status.

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

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

[0107] When the target liquid supply object is a liquid supply tank, the air suspension unit may be running or shut down. Therefore, based on the operating status of the air suspension unit, the corresponding liquid supply scheme is selected to supply liquid to the liquid supply tank. When the target liquid supply object is both a bearing and a liquid supply tank, the corresponding liquid supply scheme is selected to supply liquid to both the bearing and the liquid supply tank respectively. In this way, when the target liquid supply object and the air suspension unit's status are different, the appropriate 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 status, including:

[0109] When the air suspension unit is in operation (start-up or shutdown), the supply tank with the liquid level below the lower limit is identified as the target supply tank.

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

[0111] When the liquid level in the target liquid supply tank reaches the upper limit, 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 air suspension unit is in either start-up or shutdown status, the liquid level sensor identifies the liquid supply tank with a liquid level below the lower limit and designates it 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 described above, both the condenser and evaporator can supply liquid to both the first and second liquid supply tanks. Therefore, based on the unit's start-up / shutdown status, the condenser and / or evaporator are selected to supply liquid to the target liquid supply tank. As liquid supply proceeds to the target liquid supply tank, the liquid level gradually rises. When the liquid level in the target liquid supply tank reaches the upper limit, 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 start-up state, it controls the condenser and / or evaporator to supply liquid to the target liquid supply tank, including:

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

[0115] The air suspension unit controls the opening and closing of the pressure balancing pipeline corresponding to the target liquid supply tank based on the pressure difference between the target liquid supply tank and the compressor cavity.

[0116] At this point, the unit is in a powered-on but not running state. Therefore, the bypass electronic expansion valve is opened first, which in turn opens the bypass line between the condenser and evaporator. After the bypass line is open, the pressure between the condenser and evaporator is balanced. Simultaneously, the main liquid circuit electronic expansion valve is opened. Then, the liquid storage line corresponding to the target liquid supply tank is opened. Because the liquid supply tank is located lower than the evaporator and condenser, liquid refrigerant flows into the target liquid supply tank through the makeup liquid line and gravity, utilizing the principle of communicating vessels. As mentioned earlier, when the heat exchanger supplies liquid to the liquid supply tank, it can do so through the makeup liquid line and the liquid storage line. The opening pressure of the makeup liquid line is greater than that of the liquid storage line. Therefore, by opening the makeup liquid line, 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 corresponding liquid storage pipeline is opened, and the condenser supplies liquid to the first liquid supply tank. When the target liquid supply tank is the second liquid supply tank, the corresponding liquid storage pipeline is opened, and the evaporator supplies liquid to the second liquid supply tank.

[0118] Simultaneously, the pressure difference between the target liquid supply tank and the compressor cavity is calculated in real time. Based on this difference, the opening and closing of the pressure balancing pipeline corresponding to the target liquid supply tank is controlled to prevent excessive pressure in the target liquid supply tank. Specifically, if the difference is greater than the differential pressure threshold, the corresponding pressure balancing pipeline is opened to relieve pressure in the target liquid supply tank. If the difference is less than or equal to the differential pressure threshold, the corresponding pressure balancing pipeline is closed. The opening pressure of the exhaust pipeline is greater than that of the pressure balancing pipeline; therefore, controlling the opening of the pressure balancing pipeline makes pressure relief easier.

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

[0120] The pressure difference between the condenser and evaporator of the air suspension unit is calculated.

[0121] When the pressure difference exceeds the pressure difference threshold, the air suspension unit controls the connection of the replenishment pipeline and the exhaust pipeline corresponding to the target liquid supply tank.

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

[0123] After the unit shuts down, a pressure difference may still exist between the condenser and evaporator. At this time, liquid can be supplied to the supply tank based on the pressure difference, or it can be supplied based on the principle of communicating vessels and gravity. The specific method used depends on the pressure of the condenser and evaporator. Specifically, the pressure difference between the condenser and evaporator is calculated in real time. If the pressure difference is greater than the pressure difference threshold, the corresponding replenishment and venting lines for the target supply tank are opened. Because the pressure difference is large at this time, opening the replenishment and venting lines with higher pressure prevents excessively rapid liquid inflow and depressurization, thus accurately controlling the suspension pressure difference. If the pressure difference is less than or equal to the pressure difference threshold, the corresponding storage and pressure balancing lines for the target supply tank are opened. Because the pressure difference is small at this time, opening the storage and pressure balancing lines, which are easier to connect, allows for easier liquid supply and depressurization.

[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 connected, the condenser will supply liquid to the first liquid supply tank. If the replenishment pipeline corresponding to the first liquid supply tank is connected, the condenser will supply liquid to the first liquid supply tank.

[0125] When the target liquid supply tank is the second liquid supply tank, if the liquid storage line corresponding to the second liquid supply tank is connected, the evaporator will supply liquid to the second liquid supply tank. If the replenishment line corresponding to the second liquid supply tank is connected, the condenser will supply 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 the bearing liquid supply scheme, including:

[0127] The pressure difference between the condenser pressure and the compressor chamber pressure is calculated for the air suspension unit.

[0128] When the pressure difference is within the preset suspension pressure difference range, the air suspension unit controls the condenser to supply liquid 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 tanks; wherein the non-working liquid supply tanks are those that do 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 running and the target liquid supply is the supply tank, the pressure difference between the condenser pressure and the compressor chamber pressure is calculated in real time. If the pressure difference is within the preset suspension pressure difference range, it indicates that the condenser can supply liquid to the bearing. At this time, the condenser drain pipe is opened, thereby controlling the condenser 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 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 operating supply tank continuously supplies liquid to the bearing, its liquid level will gradually decrease. When it drops to a certain level, it can no longer provide a suspension pressure difference for the bearing, and it is necessary to switch to the other supply tank. Therefore, when the operating supply tank is supplying liquid to the bearing, the condenser is controlled to supply liquid to the non-operating supply tank. This prepares for switching the supply tank.

[0132] Optionally, the lower limit of the preset suspension pressure differential 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 the bearing liquid supply scheme, including:

[0134] The pressure difference between the condenser pressure and the compressor chamber pressure is calculated for the air suspension unit.

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

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

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

[0138] The air suspension unit controls the opening and closing of the exhaust pipe corresponding to the target liquid supply tank based on the pressure difference between the target liquid supply tank and the compressor cavity.

[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 tanks; wherein the non-working liquid supply tanks are those that do not supply liquid to the bearings.

[0140] When controlling the condenser to supply refrigerant to the bearing, as the refrigerant in the condenser is consumed, the pressure difference between it and the compressor cavity gradually decreases, eventually failing to support the bearing's suspension. Therefore, while controlling the condenser to supply refrigerant to the bearing, the supply tank with the highest liquid level is designated as the target supply tank. Then, the heating element in the target supply tank is activated to ensure the pressure within the target supply tank meets the preset suspension pressure difference range, thus preparing for switching to the supply tank to supply refrigerant to the bearing. After the electric heating element is activated, the pressure in the target supply tank gradually increases. To ensure the pressure in the target supply tank meets the preset suspension pressure difference range, the opening and closing of the exhaust pipe corresponding to the target supply tank is controlled based on the pressure difference between the pressure in the target supply tank and the pressure in the compressor cavity. Specifically, if the pressure difference exceeds the upper limit of the preset suspension pressure difference range, the exhaust pipe corresponding to the target supply tank is opened. If the pressure difference is within the preset suspension pressure difference range, the exhaust pipe corresponding to the target supply tank is closed. As mentioned above, since the pressure in the exhaust pipe is relatively high, the pressure in the liquid supply tank can be controlled more precisely by controlling the opening and closing of the exhaust pipe to relieve pressure.

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

[0142] When the liquid level in the supply tank of the air suspension unit reaches the lower limit level during operation, the heating element of the non-operational supply tank is turned on.

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

[0144] The air suspension unit controls the opening of the drain line corresponding to the non-operational liquid supply tank.

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

[0146] The liquid level of the operating supply tank is obtained through a liquid level sensor. When the liquid level reaches the lower limit, 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. Simultaneously, the pressure difference ΔPw between the pressure in the non-operating supply tank after the heating element is activated and the pressure in the compressor cavity is acquired in real time. If ΔPw is within the preset suspension pressure difference range, it means that the other supply tank has met the bearing suspension requirements. At this time, the drain line corresponding to the non-operating supply tank is opened, and the drain line corresponding to the original operating supply tank is disconnected, thus deactivating it from operation. In this way, the bearing is supplied with liquid from the other supply tank. Simultaneously, the condenser is controlled to supply liquid to the deactivated supply tank, putting it into refrigerant storage mode. Through this cyclical execution, the bearing suspension liquid supply requirements during normal compressor operation can be met.

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

[0148] The air suspension unit controls the connection of the replenishment pipeline corresponding to the non-operational supply tank.

[0149] 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.

[0150] When the unit is running and the target refrigerant supply is the bearing and the refrigerant supply tank, the operating refrigerant supply tank only executes the refrigerant supply logic, while the non-operating refrigerant supply tank executes the refrigerant storage logic. The control system connects the corresponding replenishment line to the non-operating refrigerant supply tank, thus supplying refrigerant to the non-operating tank. When the liquid level in the non-operating refrigerant supply tank reaches the upper limit, the control system disconnects the corresponding replenishment line. In this way, when one refrigerant supply tank is supplying refrigerant to the bearing, it prepares for controlling the other refrigerant supply tank to store refrigerant, thus preparing for switching refrigerant supply tanks.

[0151] Combination Figure 7 As shown in the embodiments of this disclosure, another liquid supply method for an air suspension unit is provided, including:

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

[0153] S502, the air suspension unit determines the target liquid supply object based on 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 executing S501, the air suspension unit, when the unit is started and the compressor enters the pre-start preparation stage, will determine the supply tank with the highest liquid level as the target 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 started and the compressor enters the pre-start preparation stage, the supply tank with the highest liquid level among the two supply tanks is designated as the target supply tank. The heating element inside the target supply tank is activated. Simultaneously, the corresponding valve for the target supply tank is closed. Once the heating element is operational and the suspension pressure differential is established, the compressor enters the start-up operation state. This method selects the supply tank with the relatively higher liquid level as the target supply tank and activates its internal heating element to bring it into operation. This prevents insufficient refrigerant in the supply tank from hindering the establishment of the suspension pressure differential.

[0158] The following example illustrates the specific implementation process of the liquid supply method for air suspension units provided in this disclosure:

[0159] 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.

[0160] Phase 1: Unit Start-up

[0161] The bypass line is opened, and the main liquid circuit electronic expansion valve opens to facilitate pressure balance between the condenser and evaporator. If the liquid level in the supply tank is below the lower limit, refrigerant needs to be added to the supply tank. For example, if the liquid level in the first supply tank is below the lower limit, the first ball valve is opened to open the first liquid storage line. Since the first supply tank is located below the evaporator and condenser, the condenser supplies liquid to the first supply tank using the communicating vessel principle. During this process, the second ball valve is opened to open the first pressure balancing line to depressurize the first supply tank (at this time, the first vent line can also be opened to increase the depressurization rate). Since the supply tank is supplied by gravity, it is sensitive to resistance. Therefore, opening the easier-to-open first liquid storage line allows the refrigerant to flow more smoothly into the first supply tank. As the refrigerant level in the first supply tank rises, the first ball valve closes when the level reaches the upper limit. Then, the first heating element is turned on to ensure that the pressure difference between the first liquid supply tank and the compressor chamber is within the preset suspension pressure difference range. The unit is then started. After startup, the bypass line is disconnected and the main liquid circuit electronic expansion valve is closed. The condenser liquid level is adjusted to the preset target value using a PID (Proportional-Integral-Derivative) controller.

[0162] Phase 2: Unit in operation

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

[0164] Since the unit is currently operating, the condenser pressure is higher than the evaporator pressure. If refrigerant was not supplied to the first refrigerant supply tank in "Stage 1," the pressure difference between the condenser and evaporator can be used to store refrigerant in the first refrigerant supply tank; or if refrigerant was already supplied to the first refrigerant supply tank in "Stage 1," the pressure difference between the condenser and evaporator can be used to store refrigerant in the second refrigerant supply tank. For example, if it is necessary to control the storage of refrigerant in the second refrigerant supply tank, the second solenoid valve is opened to control the second replenishment line to supply refrigerant to the second refrigerant supply tank. If the pressure difference between the second refrigerant supply tank and the compressor cavity is greater than the upper limit of the preset floating pressure difference range, the second electronic expansion valve is opened to control the second exhaust line to release pressure in the second refrigerant supply tank. The flow rate of the second exhaust line is relatively small, i.e., the pressure relief is relatively small, so the pressure in the second refrigerant supply tank can be maintained relatively accurately. If the pressure difference between the second refrigerant supply tank and the compressor cavity is within the preset floating pressure difference range, the second electronic expansion valve is closed. As the amount of refrigerant in the second supply tank increases, the second solenoid valve will close when the liquid level reaches the upper limit.

[0165] When the condenser supplies liquid to the bearing, the heating element in the supply tank with the highest liquid level is activated. This prepares the corresponding supply tank for supplying liquid to the bearing. For example, if the liquid level in the first supply tank is higher than that in the second supply tank, the first heating element is activated.

[0166] When the pressure difference between the condenser and the compressor chamber is less than the lower limit of the preset suspension pressure difference range, it indicates that the condenser can no longer supply liquid to the bearing. At this time, the third solenoid valve is closed, and the fourth solenoid valve is activated to open the first drain line, utilizing the first supply tank 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 turned off. When the pressure difference is less than the lower limit of the preset suspension pressure difference range, the first heating element is turned on.

[0167] When the liquid level in the first supply tank reaches the lower limit, the second heating element is activated. When the pressure difference between the second supply tank and the compressor cavity is within a preset suspension pressure difference range, the first drain line is disconnected to deactivate the first supply tank. Simultaneously, the first solenoid valve opens to supply liquid to the first supply tank. The first electronic expansion valve also opens to open the first exhaust line, controlling the depressurization of the first supply tank. When the liquid level in the first supply tank reaches the upper limit, the first solenoid valve and the first electronic expansion valve close. While the first supply tank stores refrigerant, the fifth solenoid valve opens to open the second drain line. At this point, the second supply tank is used to supply refrigerant to the bearings.

[0168] When the liquid level in the second supply tank reaches the lower limit, it is necessary to switch to using the first supply tank to supply liquid to the bearing, while simultaneously controlling the storage of refrigerant in the second supply tank. For details, please refer to the control logic described above regarding using the second supply tank to supply liquid to the bearing while simultaneously controlling the storage of refrigerant in the first supply tank; it will not be repeated here.

[0169] This cycle repeats, controlling the first and second liquid supply tanks to alternately supply liquid to the bearings and to alternately store refrigerant.

[0170] Phase 3: Unit shutdown

[0171] The third, fourth, and fifth solenoid valves are closed. Assume the current liquid level in the first supply tank is below the lower limit. Compare the condenser pressure and the evaporator pressure. If the condenser pressure is greater than the sum of the evaporator pressure and the pressure increment, then the first replenishment line and the first exhaust line are opened. At this time, refrigerant is stored in the first supply tank based on the pressure difference between the condenser and the evaporator. If the condenser pressure is less than or equal to the sum of the evaporator pressure and the pressure increment, it indicates that the pressure difference between the condenser and the evaporator is small, making it difficult to supply refrigerant to the supply tank based on this pressure difference. Since the supply tanks are located below the condenser and evaporator, the first storage line and the first pressure balancing line are opened, supplying refrigerant to the first supply tank through the height difference and the communicating vessel principle. Optionally, the pressure increment is 50 kPa. When the unit is shut down, the electric heating element does not start.

[0172] Assuming the current liquid level in the second supply tank is below the lower limit, then referring to the above logic, based on the pressure of the condenser and the evaporator, the on / off state of the second replenishment line, the second exhaust line, the second storage line, and the second pressure balancing line is controlled, thereby allowing the second supply tank to store refrigerant. Further details are omitted here.

[0173] Phase 4: Unit Preparation

[0174] At this point, a pressure differential needs to be established in the bearing supply to suspend the rotor. Therefore, the liquid levels in the two supply tanks are compared, and the tank with the highest liquid level is designated as the target supply tank. The heating element in the target supply tank is then activated. For example, if the liquid level in the first supply tank is higher than that in the second supply tank, the first heating element is activated. Simultaneously, the corresponding valve for that supply tank is closed. Once the suspension pressure differential is established, the compressor enters the start-up operation state, operating according to the control logic of stage 1.

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

[0176] 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.

[0177] Combination Figure 9 As shown, this disclosure provides a liquid supply device 90 for an air-suspension unit, including a processor 91 and a memory 92. Optionally, the device may further include a communication interface 93 and a bus 94. The processor 91, communication interface 93, and memory 92 can communicate with each other via the bus 94. The communication interface 93 can be used for information transmission. The processor 91 can call logical instructions in the memory 92 to execute the liquid supply method for the air-suspension unit described in the above embodiment.

[0178] Furthermore, the logic instructions in the aforementioned memory 92 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium.

[0179] The memory 92, 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 91 executes functional applications and data processing by running the program instructions / modules stored in the memory 92, thereby implementing the liquid supply method for the air suspension unit in the above embodiments.

[0180] The memory 92 may include a program storage area and a data storage area. The program storage area may store the operating system and application programs 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 92 may include high-speed random access memory and may also include non-volatile memory.

[0181] Combination Figure 10 As shown, this disclosure provides an air suspension unit 100, including: an air suspension unit body, and the aforementioned liquid supply device 80 (90) for the air suspension unit. The liquid supply device 80 (90) for the air suspension unit is installed on the air suspension unit body. The installation relationship described herein 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 connections, electrical connections, or signal transmission connections. Those skilled in the art will understand that the liquid supply device 80 (90) for the air suspension unit can be adapted to feasible product bodies to achieve other feasible embodiments.

[0182] 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.

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

[0184] 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.

[0185] 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.

[0186] 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.

[0187] 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 mutual coupling or direct coupling or communication connection shown or discussed 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 can be selected to implement this embodiment according to actual needs. In addition, 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.

[0188] 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 gas 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 side of the two liquid supply tanks are 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 two liquid supply tanks can be supplied with liquid by the pressure difference between the condenser and the evaporator; The liquid supply method comprises: obtaining the running state of the gas suspension unit; determining the target liquid supply object according to the running state of the gas suspension unit; 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 bearing and the liquid supply tank, the liquid supply scheme corresponding to the bearing and the liquid supply tank is selected to supply liquid to the bearing and the liquid supply tank; the selection of the bearing liquid supply comprises: calculating the pressure difference between the pressure of the condenser and the pressure of the compressor cavity; in the case that the pressure difference is within the preset suspension pressure difference range, the condenser is controlled to supply liquid to the bearing; in the case that 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 the liquid supply tank that does not supply liquid to the bearing.

2. The method of supplying liquid according to claim 1, wherein The determination of the target liquid supply object according to the running state of the gas suspension unit comprises: in the case that the running state of the gas suspension unit is starting or stopping, the target liquid supply object is determined to be the liquid supply tank; in the case that the running state of the gas suspension unit is running, the target liquid supply object is determined to be the bearing and the liquid supply tank.

3. The method of claim 1, wherein, The liquid supply to the target liquid supply object according to the liquid supply scheme corresponding to the target liquid supply object further comprises: in the case that the target liquid supply object is the liquid supply tank, the corresponding liquid supply scheme is selected to supply liquid to the liquid supply tank according to the running state of the gas suspension unit.

4. The method of supplying liquid according to claim 3, wherein The selection of the corresponding liquid supply scheme to supply liquid to the liquid supply tank according to the running state of the gas suspension unit comprises: in the case that the running state of the gas suspension unit is starting or stopping, the liquid supply tank with the liquid level lower than the lower limit is determined as the target liquid supply tank; the condenser and / or the evaporator are controlled to supply liquid to the target liquid supply tank; in the case that the liquid level of the target liquid supply tank reaches the upper limit, the heat exchanger corresponding to the target liquid supply tank is controlled to stop supplying liquid.

5. The method of supplying liquid according to claim 4, wherein The liquid outlet sides of the condenser and the evaporator are connected to the two liquid supply tanks through two liquid storage pipelines respectively, and the tops of the two liquid supply tanks are connected to two pressure balance pipelines respectively; in the case that the running state of the gas suspension unit is starting, the control of the condenser and / or the evaporator to supply liquid to the target liquid supply tank comprises: controlling the liquid storage pipeline corresponding to the target liquid supply tank to be connected; and controlling the connection 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 cavity.

6. The method of supplying liquid according to claim 4, wherein The outflow side of the condenser is connected with the inflow sides of the two liquid supply tanks through two liquid supplement pipelines respectively, and the tops of the two liquid supply tanks are connected with two exhaust pipelines respectively; and the outflow sides of the condenser and the evaporator are connected with the two liquid supply tanks through two liquid storage pipelines respectively, and the tops of the two liquid supply tanks are connected with two pressure balance pipelines respectively; wherein, the conduction pressure of the liquid supplement pipeline is greater than the conduction pressure of the liquid storage pipeline; the conduction pressure of the exhaust pipeline is greater than the conduction pressure of the pressure balance pipeline; In the case that the operating state of the gas suspension unit is shutdown, the method for controlling the condenser and / or the evaporator to supply liquid to the target liquid supply tank comprises: calculating the pressure difference between the condenser and the evaporator; in the case that the pressure difference is greater than the pressure difference threshold, controlling the liquid supplement pipeline and the exhaust pipeline corresponding to the target liquid supply tank to be conducted; in the case that the pressure difference is less than or equal to the pressure difference threshold, controlling the liquid storage pipeline and the pressure balance pipeline corresponding to the target liquid supply tank to be conducted.

7. The method of claim 1, wherein, The two liquid supply tanks are each provided with a heating element; the tops of the two liquid supply tanks are connected with two exhaust pipelines respectively; In the case that the target liquid supply object is the bearing and the liquid supply tank, the method for selecting the liquid supply scheme corresponding to the bearing to supply liquid to the bearing further comprises: in the case that the condenser is controlled to supply liquid to the bearing, determining the liquid supply tank with the highest liquid level as the target liquid supply tank; controlling the heating element in the target liquid supply tank to be started; controlling 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 cavity.

8. The method of claim 1, wherein, The two liquid supply tanks are each provided with a heating element; the outflow sides of the two liquid supply tanks are connected with the inflow side of the bearing through two liquid discharge pipelines respectively; The method for controlling the two liquid supply tanks to supply liquid to the bearing alternately comprises: in the case that the liquid level in the working liquid supply tank reaches the lower limit liquid level, controlling the heating element of the non-working liquid supply tank to be started; In Pw in the case of a preset suspension pressure difference range, control the original working liquid tank out of working state; controlling the liquid discharge pipeline corresponding to the non-working liquid supply tank to be conducted; Among them, the working liquid supply tank is the liquid supply tank that is supplying liquid to the bearing, and the non-working liquid supply tank is the liquid supply tank that is not supplying liquid to the bearing; Pw 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.

9. The method of claim 1, wherein, The outflow side of the condenser is connected with the inflow sides of the two liquid supply tanks through two liquid supplement pipelines respectively; In the case that the target liquid supply object is the bearing and the liquid supply tank, the method for selecting the liquid supply scheme corresponding to the liquid supply tank to supply liquid to the liquid supply tank further comprises: controlling the liquid supplement pipeline corresponding to the non-working liquid supply tank to be conducted; in the case that the liquid level of the non-working liquid supply tank reaches the upper limit liquid level, controlling the corresponding liquid supplement pipeline to be disconnected.

10. The method of supplying liquid according to claim 9, wherein The tops of the two liquid supply tanks are connected with two exhaust pipelines respectively; In the case that the liquid supplement pipeline corresponding to the non-working liquid supply tank is controlled to be conducted, the method for selecting the liquid supply scheme corresponding to the liquid supply tank to supply liquid to the liquid supply tank further comprises: obtaining the pressure difference between the non-working liquid supply tank and the compressor cavity; controlling the on-off of the exhaust pipeline corresponding to the non-working liquid supply tank according to the pressure difference.

11. The method of supplying liquid according to claim 10, wherein The two liquid supply tanks are each 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 method further comprises: in the case that the unit is started and the compressor enters the pre-starting preparation stage, determining the liquid supply tank with the highest liquid level as the target liquid supply tank; controlling the heating element in the target liquid supply tank to be started.

12. A liquid supply device for an air suspension unit, comprising a processor and a memory having stored program instructions, characterized in that, The processor is configured to execute the method for supplying liquid to the gas suspension unit as claimed in any one of claims 1 to 11 when the program instructions are run.

13. An air bearing assembly, characterized by, Comprise: The gas suspension unit body comprises a condenser, an evaporator and a liquid supply system; The liquid supply system comprises two liquid supply tanks; wherein the liquid outlet side of the condenser and the liquid outlet side 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 two liquid supply tanks are supplied with liquid by the pressure difference between the condenser and the evaporator; and, The liquid supply device for the gas suspension unit as claimed in claim 12 is installed in the gas suspension unit body.

14. A storage medium storing program instructions, characterized in that, The program instructions, when run, execute the method for supplying liquid to the gas suspension unit as claimed in any one of claims 1 to 11.

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