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

Abstract

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

Description

Technical Field

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

[0026] Fig.10 is a schematic diagram of a liquid supply device for an air suspension unit provided in an embodiment of the present disclosure;

[0027] Fig.11 is a schematic diagram of another liquid supply device for an air suspension unit provided in an embodiment of the present disclosure;

[0028] Fig.12 Schematic diagram of an air suspension unit provided in an embodiment of the present disclosure.

[0029] Reference numerals:

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

[0031] In order to be able to understand the features and technical contents of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0032] The terms "first", "second", etc. in the specification and claims of the embodiments of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so that the embodiments of the embodiments of the present disclosure described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

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

[0034] In the embodiment of the present disclosure, the character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B indicates: A or B.

[0035] The term "and / or" is a description of the association relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or, A and B.

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

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

[0038] In some embodiments, the air suspension unit also includes a bypass pipeline 101 and a motor cooling pipeline 102. The bypass pipeline 101 is connected to the condenser 3 and the evaporator 4, and the bypass pipeline 101 is provided with a bypass electronic expansion valve. The motor cooling pipeline 102 is connected to the inner cavity of the condenser 3 and the compressor, and the motor cooling pipeline 102 is provided with a motor cooling electronic expansion valve. By setting the bypass pipeline 101, the bypass pipeline is provided with a bypass electronic expansion valve for start and stop, high pressure ratio control and low load unloading bypass. By setting the motor cooling pipeline 102, the refrigerant in the condenser 3 enters the inner cavity of the compressor through the motor cooling electronic expansion valve. By adjusting the opening of the motor cooling electronic expansion valve, the temperature of the refrigerant entering the compressor can be adjusted, thereby ensuring that the compressor motor temperature is within a reasonable range.

[0039] In some embodiments, in combination Figure 2 As shown, the liquid supply system includes two liquid supply tanks. Each liquid supply tank is configured with a liquid inlet, an exhaust port and a liquid discharge port. The liquid inlet can be communicated with the condenser 3, the exhaust port can be communicated with the evaporator 4, and the liquid discharge port can be communicated with the liquid inlet side of the bearing. A heating element is provided in each liquid supply tank.

[0040] During the normal operation of the compressor, one of the liquid supply tanks provides liquid refrigerant to the bearing, while the other liquid supply tank stores liquid refrigerant. The two liquid supply tanks alternately provide liquid refrigerant to the bearing. When the liquid supply tank provides liquid refrigerant to the bearing, the liquid inlet and the exhaust port are blocked, the liquid discharge port is open, and the heating element heats the liquid refrigerant in the liquid supply tank to maintain the pressure difference between the liquid supply tank and the machine cavity of the compressor. The liquid refrigerant in the liquid supply tank flows to the liquid inlet side of the bearing through the liquid discharge port by using the pressure difference. When the liquid supply tank stores liquid refrigerant, the liquid inlet and the exhaust port are open, the liquid discharge port is blocked, and the pressure difference between the condenser 3 and the evaporator 4 is used to make the liquid refrigerant in the condenser 3 enter and be stored in the liquid supply tank.

[0041] When the liquid supply tank provides liquid refrigerant for the bearing, the liquid discharge port is opened to connect the liquid supply tank with the liquid inlet side of the bearing; the liquid inlet and the exhaust port are blocked to keep the liquid supply tank in a relatively sealed state, and the pressure of the liquid supply tank is increased by heating with the heating element; under the action of the pressure difference between the liquid supply tank and the compressor, the liquid refrigerant in the liquid supply tank flows to the liquid inlet side of the bearing. When the liquid supply tank stores liquid refrigerant, the liquid inlet and the exhaust port are opened to connect the liquid supply tank to the evaporator 4 and the condenser 3; during the normal operation of the compressor, the pressure in the evaporator 4 is greater than the pressure in the condenser 3, and under the action of the pressure difference between the evaporator 4 and the condenser 3, the liquid refrigerant in the evaporator 4 flows into and is stored in the liquid supply tank. During the normal operation of the compressor, one of the liquid supply tanks provides liquid refrigerant for the bearing, while the other liquid supply tank stores liquid refrigerant. The two liquid supply tanks alternately provide liquid refrigerant for the bearing to maintain stable suspension of the compressor rotor. The air suspension unit provided in the embodiment of the present disclosure utilizes the pressure difference between the condenser 3 and the evaporator 4 to replenish the liquid refrigerant in the liquid supply tank, without the need to provide a gear pump as in the related art. This not only saves energy but also avoids problems such as aging and failure of the gear pump.

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

[0043] The first liquid supply tank 501 is constructed with a first liquid inlet 5011, a first exhaust port 5012 and a first liquid discharge port 5013. The first liquid inlet 5011 can be communicated with the condenser 3, the first exhaust port 5012 can be communicated with the evaporator 4, and the first liquid discharge port 5013 can be communicated with the liquid inlet side of the bearing. A first heating element 5014 is provided in the first liquid supply tank 501. When the first liquid supply tank provides liquid refrigerant for the bearing, the first liquid inlet and the first exhaust port are blocked, the first liquid discharge port is opened, and the first heating element heats the liquid refrigerant in the first liquid supply tank to maintain the pressure difference between the first liquid supply tank and the compressor, and the liquid refrigerant in the first liquid supply tank flows to the liquid inlet side of the bearing through the first liquid discharge port by using the pressure difference. When the first liquid supply tank stores liquid refrigerant, the first liquid inlet and the first exhaust port are opened, the first liquid discharge port is blocked, and the pressure difference between the condenser 3 and the evaporator 4 is used to make the liquid refrigerant in the condenser 3 enter and be stored in the first liquid supply tank.

[0044] The second liquid supply tank 502 is configured with a second liquid inlet 5021, a second exhaust port 5022 and a second liquid discharge port 5023. The second liquid inlet 5021 can be communicated with the condenser 3, the second exhaust port 5022 can be communicated with the evaporator 4, and the second liquid discharge port 5023 can be communicated with the liquid inlet side of the bearing. A second heating element 5024 is provided in the second liquid supply tank 502. When the second liquid supply tank provides liquid refrigerant for the bearing, the second liquid inlet and the second exhaust port are blocked, and the second liquid discharge port is opened. The second heating element heats the liquid refrigerant in the second liquid supply tank to maintain the pressure difference between the second liquid supply tank and the compressor, and the liquid refrigerant in the second liquid supply tank flows to the liquid inlet side of the bearing through the second liquid discharge port by using the pressure difference. When the second liquid supply tank stores liquid refrigerant, the second liquid inlet and the second exhaust port are opened, and the second liquid discharge port is blocked. The pressure difference between the condenser 3 and the evaporator 4 is used to make the liquid refrigerant in the condenser 3 enter and be stored in the second liquid supply tank.

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

[0046] In some embodiments, in combination Figure 2 The air suspension unit also includes: two liquid replenishment pipelines, namely the first liquid replenishment pipeline and the second liquid replenishment pipeline, which can be controlled to be turned on or off. Two liquid discharge pipelines, namely the first liquid discharge pipeline and the second liquid discharge pipeline. The liquid outlet side of the condenser is connected to the first liquid inlet 5011 of the first liquid supply tank 501 through the first liquid replenishment pipeline. The liquid outlet side of the first liquid supply tank 501 is connected to the bearing side of the compressor through the first liquid discharge pipeline. The liquid outlet side of the condenser is also connected to the second liquid inlet 5021 of the second liquid supply tank 502 through the second liquid replenishment pipeline. The liquid outlet side of the second liquid supply tank 502 is connected to the bearing side of the compressor through the second liquid discharge pipeline.

[0047] The air suspension unit also includes: two bypass pressure relief pipelines, namely a first bypass pressure relief pipeline and a second bypass pressure relief pipeline, which can be controlled to be turned on or off. The top of the first liquid supply tank 501 is connected to the evaporator through the first bypass pressure relief pipeline. The top of the second liquid supply tank 502 is connected to the evaporator through the second bypass pressure relief pipeline.

[0048] The first liquid replenishing pipeline includes: a first liquid inlet pipe 503. The first bypass pressure relief pipeline includes: a first exhaust pipeline. The first exhaust pipeline includes: a first exhaust pipe 504. The first liquid discharge pipeline includes: a first liquid discharge pipe 505.

[0049] Optionally, the first liquid inlet pipe 503 is connected to the condenser 3 and the first liquid inlet port 5011, and a first solenoid valve is provided on the first liquid inlet pipe 503. The condenser 3 and the first liquid inlet port 5011 of the first liquid supply tank 501 can be connected through the first liquid inlet pipe 503, so that the refrigerant in the condenser 3 is introduced into the first liquid supply tank 501. By providing the first solenoid valve, it is convenient to control the connection or blocking of the first liquid inlet pipe 503.

[0050] Optionally, the first liquid inlet pipe 503 is further provided with a one-way valve, which can limit the refrigerant in the first liquid inlet pipe 503 to flow from the condenser 3 to the first liquid supply tank 501. This arrangement can prevent the refrigerant from flowing back and improve the reliability of the liquid supply system.

[0051] Optionally, the first liquid inlet pipe 503 is connected to the bottom of the condenser 3, so as to facilitate the extraction of liquid refrigerant in the condenser 3.

[0052] Optionally, the first exhaust pipe 504 is connected to the first exhaust port 5012 and the evaporator 4, and a first electronic expansion valve is provided on the first exhaust pipe 504. The first liquid supply tank 501 can be connected to the evaporator 4 through the first exhaust pipe 504, so that the pressure difference between the condenser and the evaporator is conveniently used to press the refrigerant in the condenser into the first liquid supply tank, and replenish the liquid refrigerant for the first liquid supply tank 501. By providing the first electronic expansion valve, it is convenient to control the connection or blocking of the first exhaust pipe 504.

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

[0054] Optionally, the first end of the first liquid discharge pipe 505 is connected to the first liquid discharge port 5013, and the second end is connected to the liquid inlet side of the bearing. The first liquid discharge pipe 505 is provided with a first one-way valve, and the first one-way valve can limit the refrigerant from the first end of the first liquid discharge pipe 505 to the second end of the first liquid discharge pipe 505. By providing the first liquid discharge pipe 505, the first liquid supply tank 501 can provide liquid refrigerant to the bearing. By providing the first one-way valve, the refrigerant can be prevented from flowing back, thereby improving the reliability of the liquid supply system.

[0055] It is understandable that the one-way valve requires a certain pressure to be pushed open. When the first liquid supply tank 501 supplies liquid to the liquid inlet side of the bearing, the gas pressure of the first liquid supply tank 501 is relatively large, which can press the liquid refrigerant into the first liquid discharge pipe 505 and push open the first one-way valve. When the first liquid supply tank 501 stores liquid refrigerant, the gas pressure in the first liquid supply tank is equal to the gas pressure of the evaporator 4, the gas pressure in the first liquid supply tank 501 is relatively small, and the first one-way valve is in a closed state.

[0056] In some embodiments, the first exhaust port 5012 is disposed at the top of the first liquid supply tank 501. This arrangement can prevent the liquid refrigerant from being discharged through the first exhaust port 5012.

[0057] In some embodiments, the first liquid discharge port 5013 and the first liquid inlet 5011 are disposed at the bottom of the first liquid supply tank 501. The first liquid inlet 5011 is disposed at the bottom of the first liquid supply tank 501 to avoid refrigerant splashing. When the first liquid supply tank 501 is used to supply liquid, the first heating element 5014 heats the liquid refrigerant in the first liquid supply tank 501, and the liquid refrigerant evaporates to increase the gas pressure at the top of the first liquid supply tank 501. Under the action of the gas pressure, the liquid refrigerant flows out through the first liquid discharge port 5013. Therefore, by disposing the first liquid discharge port 5013 at the bottom of the first liquid supply tank 501, more liquid refrigerant can be discharged.

[0058] In some embodiments, the second liquid replenishing pipeline includes: a second liquid inlet pipe 506. The second bypass pressure relief pipeline includes: a second exhaust pipeline. The second exhaust pipeline includes: a second exhaust pipe 507. The second liquid discharge pipeline includes: a second liquid discharge pipe 508.

[0059] Optionally, the second liquid inlet pipe 506 is connected to the condenser 3 and the second liquid inlet port 5021, and a second solenoid valve is provided on the second liquid inlet pipe 506. The condenser 3 and the second liquid inlet port 5021 of the second liquid supply tank 502 can be connected through the second liquid inlet pipe 506, so that the refrigerant in the condenser 3 is introduced into the second liquid supply tank 502. By providing the second solenoid valve, it is convenient to control the connection or blocking of the second liquid inlet pipe 506.

[0060] Optionally, the second liquid inlet pipe 506 is connected to the bottom of the condenser 3, so as to facilitate the extraction of liquid refrigerant in the condenser 3.

[0061] Optionally, the second liquid inlet pipe 506 is further provided with a one-way valve. The one-way valve can limit the refrigerant in the second liquid inlet pipe 506 to flow from the condenser 3 to the second liquid supply tank 502. Such a configuration can prevent the refrigerant from flowing back and improve the reliability of the liquid supply system.

[0062] Optionally, the second exhaust pipe 507 is connected to the second exhaust port 5022 and the evaporator 4, and the second exhaust pipe 507 is provided with a second electronic expansion valve. The second liquid supply tank 502 can be connected to the evaporator 4 through the second exhaust pipe 507, so that the pressure difference between the condenser and the evaporator is used to press the refrigerant in the condenser into the second liquid supply tank 502, and the liquid refrigerant is added to the second liquid supply tank 502. By providing the second electronic expansion valve, it is convenient to control the connection or blocking of the second exhaust pipe 507.

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

[0064] Optionally, the first end of the second drain pipe 508 is connected to the second drain port, the second end of the second drain pipe 508 is connected to the liquid inlet side of the bearing, and the second drain pipe 508 is provided with a second one-way valve, which can limit the refrigerant to flow from the first end of the second drain pipe 508 to the second end of the second drain pipe 508. By providing the second drain pipe 508, the second liquid supply tank 502 can provide liquid refrigerant to the bearing. By providing the second one-way valve, the refrigerant can be prevented from flowing back, thereby improving the reliability of the liquid supply system.

[0065] In some embodiments, the second exhaust port 5022 is disposed at the top of the second liquid supply tank 502. This arrangement can prevent the liquid refrigerant from being discharged through the second exhaust port 5022.

[0066] In some embodiments, the second liquid discharge port 5023 and the second liquid inlet 5021 are disposed at the bottom of the second liquid supply tank 502. The second liquid inlet 5021 is disposed at the bottom of the second liquid supply tank 502 to avoid refrigerant splashing. When the second liquid supply tank 502 is used to supply liquid, the second heating element 5024 heats the liquid refrigerant in the second liquid supply tank 502, and the liquid refrigerant evaporates to increase the gas pressure at the upper part of the second liquid supply tank 502. Under the action of the gas pressure, the liquid refrigerant flows out through the second liquid discharge port 5023. Therefore, by disposing the second liquid discharge port 5023 at the bottom of the second liquid supply tank 502, more liquid refrigerant can be discharged.

[0067] In some embodiments, the heating element is disposed at the bottom of the liquid supply tank, and the height of the heating element is lower than the height of the liquid discharge port. This arrangement can prevent the heating element from drying out, and the heating element is always immersed in the liquid refrigerant.

[0068] In some embodiments, a liquid level sensor is provided in the liquid supply tank, so as to facilitate the measurement of the liquid level of the liquid refrigerant in the liquid supply tank.

[0069] In some embodiments, a pressure sensor is provided in the liquid supply tank, so as to facilitate the measurement of the gas pressure in the liquid supply tank.

[0070] In some embodiments, a safety valve is disposed on the top of the liquid supply tank. With such an arrangement, when the gas pressure in the liquid supply tank is too high, the pressure can be released through the safety valve, thereby improving the safety of the liquid supply tank.

[0071] In some embodiments, the position height of the liquid supply tank is lower than the position height of the evaporator 4 and the condenser 3. In this way, it is convenient to make the liquid refrigerant in the evaporator 4 and the condenser 3 flow into the liquid supply tank under the action of gravity.

[0072] Optionally, the air suspension unit further includes: two liquid storage pipelines, namely a first liquid storage pipeline and a second liquid storage pipeline, which can be controlled to be turned on or off. The liquid outlet side of the condenser is connected to the liquid inlet side of the first liquid supply tank 501 through the first liquid storage pipeline. The liquid outlet side of the condenser is also connected to the liquid inlet side of the second liquid supply tank 502 through the second liquid storage pipeline.

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

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

[0075] Optionally, the third liquid inlet pipe 509 is connected to the condenser 3 and the first liquid supply tank 501, and the third liquid inlet pipe 509 is provided with a first ball valve. The fourth liquid inlet pipe 510 is connected to the evaporator 4 and the second liquid supply tank 502, and the fourth liquid inlet pipe 510 is provided with a second ball valve. The first end of the first pressure balance pipe 511 is connected to the evaporator 4, and the second end is connected to the second liquid supply tank 502, and the first pressure balance pipe 511 is provided with a third ball valve. The first end of the second pressure balance pipe 512 is connected to the first pressure balance pipe 511, and the second end of the second pressure balance pipe 512 is connected to the first liquid supply tank 501. The communication position of the second pressure balance pipe 512 and the first pressure balance pipe 511 is located upstream of the setting position of the third ball valve. Wherein, when the liquid refrigerant in the first liquid supply tank 501 is too little when the compressor is stopped, the first ball valve and the third ball valve are opened to use the condenser 3 to supplement the liquid refrigerant for the first liquid supply tank. When the liquid refrigerant in the second liquid supply tank 502 is too little, the first ball valve and the third ball valve are opened to use the evaporator 4 to replenish the liquid refrigerant for the second liquid supply tank 502 .

[0076] When the unit is shut down and the compressor is stopped, it is necessary to store an appropriate amount of refrigerant for the liquid supply tank in order to start the machine next time. At this time, the refrigerant is stored by controlling the states of the first ball valve, the second ball valve and the third ball valve. When there is too little liquid refrigerant in the first liquid supply tank 501, the first ball valve and the third ball valve are opened, and the first liquid supply tank is connected to the evaporator and the condenser. At this time, the first liquid supply tank 501 is stored with the pressure difference between the condenser and the evaporator and / or the gravity communication principle, that is, the refrigerant in the condenser flows into and is stored in the first liquid supply tank 501. When there is more liquid refrigerant in the first liquid supply tank 501, the first ball valve and the third ball valve are closed. When there is too little liquid refrigerant in the second liquid supply tank 502, the second ball valve and the third ball valve are opened, and the second liquid supply tank is connected to the evaporator. At this time, the second liquid supply tank 502 is stored with the gravity communication principle, that is, the refrigerant in the evaporator flows into and is stored in the second liquid supply tank 502. When there is more liquid refrigerant in the second liquid supply tank 502, the second ball valve and the third ball valve are closed.

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

[0078] In some embodiments, the third liquid inlet pipe 509 is connected to the bottom of the condenser 3; the fourth liquid inlet pipe 510 is connected to the bottom of the evaporator 4; the first end of the first pressure balance pipe 511 is connected to the top of the evaporator, and the second end is connected to the top of the second liquid supply tank 502, and the first pressure balance pipe 511 is provided with a third ball valve. The first end of the second pressure balance pipe 512 is connected to the first pressure balance pipe 511, and the second end of the second pressure balance pipe 512 is connected to the top of the first liquid supply tank 501. In this way, when the compressor is stopped, it is convenient to make the liquid refrigerant in the condenser 3 flow into the first liquid supply tank 501, and the liquid refrigerant in the evaporator 4 flows into the second liquid supply tank 502.

[0079] Each liquid supply tank is provided with a plurality of liquid levels, including: an upper limit liquid level, a third preset liquid level, a second preset liquid level, a lower limit liquid level and a first preset liquid level, which are provided with decreasing heights in sequence.

[0080] Combination Figure 5 As shown, the embodiment of the present disclosure provides a liquid supply method for an air suspension unit, comprising:

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

[0082] S502: The air suspension unit determines a target liquid supply object according to its operating status.

[0083] S503: The air suspension unit supplies liquid to the target liquid supply object according to the liquid supply plan corresponding to the target liquid supply object.

[0084] The operating state of the air suspension unit is obtained, such as one or more of the on / off state of the air suspension unit, the operating state of the compressor, the pressure of the condenser, and the pressure of the evaporator. According to the operating state of the air suspension unit, the target liquid supply object is determined. The target liquid supply object includes a bearing, a first liquid supply tank, and a second liquid supply tank. The control unit is operated according to the liquid supply scheme corresponding to the target liquid supply object to supply liquid to the target liquid supply object.

[0085] The liquid supply method for an air suspension unit provided by the embodiment of the present disclosure is adopted, and the target liquid supply object is determined based on the operating state of the air suspension unit, and then the liquid supply scheme corresponding to the target liquid supply object is matched, and liquid is supplied to the target liquid supply object according to the liquid supply scheme. Among them, the target liquid supply object includes a bearing and two liquid supply tanks. The liquid outlet sides of the two liquid supply tanks are both connected to the liquid inlet side of the bearing of the compressor. In this way, a suitable liquid supply scheme can be selected for liquid supply based on the target liquid supply object. Moreover, when the target liquid supply object is a liquid supply tank, the pressure difference between the condenser and the evaporator can be used to supply liquid to the two liquid supply tanks. In this way, even if a gear pump is not used, a stable liquid supply source can be guaranteed, and problems such as aging and failure of the gear pump can be avoided.

[0086] Optionally, in step S502, the air suspension unit determines a target liquid supply object according to its operating state, including:

[0087] When the air suspension unit is turned on and the compressor operates normally, the target liquid supply object is determined according to the pressure of the condenser.

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

[0089] When the unit is turned on and the compressor is operating normally, on the one hand, the liquid supply tank needs to be used to supply liquid to the bearing; on the other hand, as the liquid supply tank continues to supply liquid, the refrigerant in the liquid supply tank will gradually decrease, so the condenser needs to be used to supply liquid to the liquid supply tank. Since there are two liquid supply tanks, when supplying liquid to the liquid supply tank, it is possible to further determine which liquid supply tank to supply liquid to based on the pressure of the condenser, that is, determine the target liquid supply object based on the pressure of the condenser.

[0090] When the unit is shut down and the compressor is stopped, the target liquid supply object is determined to be the liquid supply tank that meets the preset conditions. In this way, after the target liquid supply object is supplied with liquid, it can be ensured that the liquid levels in the two liquid supply tanks can meet the normal operation requirements of the unit after startup.

[0091] Optionally, the preset condition is that the liquid level of the liquid supply tank is less than a third preset liquid level. The third preset liquid level is the liquid level that allows heating when the unit is turned on. When the liquid level of the liquid supply tank is less than the third preset liquid level, it indicates that the liquid level of the liquid supply tank is low and cannot supply liquid to the bearing normally. Therefore, the preset condition is set to that the liquid level of the liquid supply tank is less than the third preset liquid level. In this way, when the unit is shut down and the compressor stops, the liquid supply tank with a liquid level less than the third preset liquid level is determined as the target liquid supply object, and then before the unit is started next time, the liquid supply tank is supplied with liquid so that the liquid supply tank stores enough refrigerant to meet the normal operation requirements after the unit is started.

[0092] Optionally, the air suspension unit determines the target liquid supply object according to the pressure of the condenser, including:

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

[0094] When the pressure of the condenser of the air suspension unit is greater than the pressure threshold, if the pressure ratio of the air suspension unit is greater than the pressure ratio threshold, the target liquid supply objects are determined to be the bearing and the working liquid supply tank; wherein the working liquid supply tank is the liquid supply tank that is supplying liquid to the bearing.

[0095] If the pressure of the condenser is greater than the pressure of the evaporator, it means that the pressure difference between the condenser and the evaporator can be used to supply liquid to the liquid supply tank. When the liquid level in one liquid supply tank drops to the point where it cannot provide a pressure difference to the bearing, it is necessary to switch to another liquid supply tank for liquid supply. Therefore, it is determined that the target liquid supply object includes two liquid supply tanks. And the compressor is currently running, so it is determined that the target liquid supply object also includes the bearing.

[0096] When the pressure of the condenser is greater than the pressure threshold, if the pressure ratio of the air suspension unit is greater than the pressure ratio threshold, that is, if the pressure ratio is large, the characterization can be based on the pressure difference between the condenser and the liquid supply tank, and the liquid supply tank in the process of supplying liquid to the bearing can be directly supplied. Therefore, the target liquid supply object is determined to be the liquid supply tank in operation. Optionally, the pressure threshold is the sum of the pressure of the liquid supply tank in operation and the first pressure increment. The first pressure increment can be set according to actual needs, for example, set to 50 kPa.

[0097] Combination Figure 6 As shown, the embodiment of the present disclosure provides another liquid supply method for an air suspension unit, comprising:

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

[0099] S502: The air suspension unit determines a target liquid supply object according to its operating status.

[0100] S513, when the target liquid supply objects are the bearings and the two liquid supply tanks, 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-operating liquid supply tank; wherein the non-operating liquid supply tank is the liquid supply tank that does not supply liquid to the bearings.

[0101] When the objects of fluid supply are the bearing and two fluid supply tanks, the two fluid supply tanks are controlled to supply fluid to the bearing alternately. In this way, the fluid supply system provides a continuous and stable suspension pressure difference for the bearing. As the working fluid supply tank continues to supply fluid to the bearing, its fluid level will gradually drop. When it drops to a certain level, it will be unable to provide a suspension pressure difference for the bearing, and it is necessary to switch to another fluid supply tank. Therefore, when the working fluid supply tank supplies fluid to the bearing, the condenser is controlled to supply fluid to the non-working fluid supply tank. This can prepare for switching the fluid supply tank.

[0102] When the working liquid supply tank supplies liquid to the bearing, the one-way valve on the corresponding discharge pipe is pushed open by the refrigerant, and then the refrigerant enters the bearing.

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

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

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

[0106] When ΔPw>ΔPg, the air suspension unit controls the heating element in the original working liquid supply tank to be turned off, so that the corresponding liquid supply tank exits the working state.

[0107] Among them, ΔPw is the pressure difference between the pressure of the non-working liquid supply tank after entering the working state and the pressure of the compressor cavity, and ΔPg is the pressure difference between the pressure of the original working liquid supply tank and the pressure of the compressor cavity.

[0108] The liquid level of the working liquid supply tank is obtained by the liquid level sensor. When the liquid level reaches the first preset liquid level, it indicates that the liquid level of the working liquid supply tank is already very low, and another liquid supply tank is needed to prepare for liquid supply. Then the heating element in the non-working liquid supply tank is controlled to open to increase its refrigerant pressure so that it enters the working state. At the same time, the pressure difference ΔPw between the pressure of the non-working liquid supply tank after entering the working state and the pressure of the compressor cavity, as well as the pressure difference ΔPg between the pressure of the original working liquid supply tank and the pressure of the compressor cavity are obtained in real time. If ΔPw>ΔPg, it means that the other switched liquid supply tank has entered the state of supplying liquid to the bearing. At this time, the one-way valve on the discharge pipe corresponding to the other liquid supply tank will be pushed open by the refrigerant, and the one-way valve on the discharge pipe corresponding to the original working liquid supply tank will be closed. Therefore, the heating element in the original working liquid supply tank is controlled to be closed, so that the corresponding liquid supply tank exits the working state. Switch to using another liquid supply tank to supply liquid to the bearing. At the same time, the condenser is controlled to supply liquid to the liquid supply tank that has exited the working state, so that it enters the state of storing refrigerant. By executing such a cycle, the bearing suspension fluid supply requirements during normal operation of the compressor can be met.

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

[0110] The air suspension unit controls the fluid replenishment pipeline corresponding to the non-operating fluid supply tank to be connected.

[0111] When the liquid level of the non-operating liquid supply tank of the air suspension unit reaches the upper limit liquid level, the corresponding liquid replenishing pipeline is controlled to be disconnected.

[0112] The liquid replenishment pipeline corresponding to the non-operating liquid supply tank is controlled to be connected. Specifically, the solenoid valve on the liquid inlet pipe corresponding to the non-operating liquid supply tank is controlled to be opened, and the refrigerant is stored by the pressure difference between the condenser and the evaporator. When the liquid level of the non-operating liquid supply tank reaches the upper limit liquid level, it means that the refrigerant has been stored, and the corresponding liquid replenishment pipeline is controlled to be disconnected, specifically, the solenoid valve on the corresponding liquid inlet pipe is controlled to be closed.

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

[0114] The air suspension unit controls the fluid replenishment pipeline corresponding to the non-operating fluid supply tank to be connected.

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

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

[0117] When the liquid level of the non-operating liquid supply tank of the air suspension unit reaches the upper limit liquid level, the corresponding liquid replenishing pipeline is controlled to be disconnected.

[0118] After the corresponding refilling pipeline of the non-operating liquid supply tank is controlled to be turned on, the refrigerant in the condenser flows into the non-operating liquid supply tank, which will cause the pressure in the tank to increase. In order to provide a suitable suspension pressure difference for the bearing and ensure that the pressure of the liquid supply tank is within a safe range, the liquid supply tank needs to be depressurized when necessary. Therefore, the pressure of the non-operating liquid supply tank is obtained through a pressure sensor, and the pressure difference between it and the pressure of the compressor cavity is calculated. The bypass pressure relief pipeline is turned on or off according to the pressure difference.

[0119] Specifically, if the pressure difference is greater than the sum of the upper limit of the preset suspension pressure difference range and the second pressure increment, the bypass pressure relief pipeline is controlled to be connected to relieve pressure. Specifically, the electronic expansion valve on the exhaust pipe corresponding to the non-working liquid supply tank is controlled to be opened. Since the flow rate of the electronic expansion valve is relatively small, the electronic expansion valve is controlled to be opened, that is, the exhaust pipe is controlled to be connected, so as to more accurately ensure the pressure in the tank. Optionally, the second pressure increment can be set according to actual needs, for example, set to 20kPa. If the pressure difference is less than the difference between the upper limit of the preset suspension pressure difference range and the first pressure reduction, the bypass pressure relief pipeline is controlled to be disconnected and the pressure relief is stopped. Specifically, the electronic expansion valve on the exhaust pipe corresponding to the non-working liquid supply tank is controlled to be closed. Optionally, the first pressure reduction can be set according to actual needs, for example, set to 10kPa.

[0120] Combination Figure 7 As shown, the embodiment of the present disclosure provides another liquid supply method for an air suspension unit, comprising:

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

[0122] S502: The air suspension unit determines a target liquid supply object according to its operating status.

[0123] S513, when the target liquid supply objects are the bearings and the two liquid supply tanks, 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-operating liquid supply tank; wherein the non-operating liquid supply tank is the liquid supply tank that does not supply liquid to the bearings.

[0124] S523, when the target liquid supply object is a working liquid supply tank and the liquid level of the working liquid supply tank is less than a second preset liquid level, the air suspension unit controls the liquid replenishing pipeline corresponding to the working liquid supply tank to be connected.

[0125] S533, when the liquid level of the liquid supply tank of the air suspension unit reaches the upper limit liquid level during operation, the corresponding liquid replenishing pipeline is controlled to be disconnected.

[0126] When the target liquid supply object is a working liquid supply tank, the liquid level of the working liquid supply tank is obtained in real time. When the liquid level is less than the second preset liquid level, it indicates that the working liquid supply tank needs to be supplied with liquid at this time. Then the liquid replenishment pipeline corresponding to the working liquid supply tank is controlled to be connected so that the condenser supplies liquid to the working liquid supply tank. Specifically, the solenoid valve on the liquid inlet pipe corresponding to the working liquid supply tank is controlled to open. Since the opening resistance of the solenoid valve is large, the solenoid valve is controlled to open, so that the amount of liquid replenishment to the liquid supply tank can be accurately controlled. When the liquid level of the working liquid supply tank reaches the upper limit level, it means that the refrigerant compensation is completed, and the corresponding liquid replenishment pipeline is controlled to be disconnected. In this way, storing refrigerant for the working liquid supply tank can reduce the working frequency and opening time of the heating element in another liquid supply tank, thereby reducing the loss of the heating element.

[0127] Combination Figure 8 As shown, the embodiment of the present disclosure provides another liquid supply method for an air suspension unit, comprising:

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

[0129] S502: The air suspension unit determines a target liquid supply object according to its operating status.

[0130] S513, when the target liquid supply objects are the bearings and the two liquid supply tanks, 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-operating liquid supply tank; wherein the non-operating liquid supply tank is the liquid supply tank that does not supply liquid to the bearings.

[0131] S523, when the target liquid supply object is a working liquid supply tank and the liquid level of the working liquid supply tank is less than a second preset liquid level, the air suspension unit controls the liquid replenishing pipeline corresponding to the working liquid supply tank to be connected.

[0132] S533, when the liquid level of the liquid supply tank of the air suspension unit reaches the upper limit liquid level during operation, the corresponding liquid replenishing pipeline is controlled to be disconnected.

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

[0134] S553, when the liquid level of the liquid supply tank that meets the preset conditions reaches the upper limit liquid level, the air suspension unit controls the corresponding liquid storage pipeline and bypass pressure relief pipeline to be disconnected.

[0135] When the unit is shut down and the compressor is stopped, the target liquid supply object is a liquid supply tank that meets the preset conditions, that is, the target liquid supply object is a liquid supply tank whose liquid level is less than the third preset liquid level. At this time, the liquid level of the liquid supply tank is low, and refrigerant needs to be replenished to prepare for the next startup of the unit. Therefore, the liquid storage pipeline and the bypass pressure relief pipeline corresponding to the liquid supply tank can be controlled to be connected to supply liquid and relieve pressure to the liquid supply tank. Specifically, the ball valve on the liquid inlet pipe corresponding to the liquid supply tank is controlled to be opened. In this way, since the current unit is in a shutdown state, the pressure of the refrigerant is not very high, so it is easier for the refrigerant to enter the liquid supply tank by controlling the ball valve to open. At the same time, the bypass pressure relief pipeline is controlled to be connected to relieve pressure on the liquid supply tank. When the liquid level of the liquid supply tank reaches the upper limit level, it means that the refrigerant has been replenished, and the corresponding liquid storage pipeline and bypass pressure relief pipeline are controlled to be disconnected.

[0136] Optionally, in step S543, the air suspension unit controls the bypass pressure relief pipeline corresponding to the liquid supply tank that meets the preset conditions to be turned on, including:

[0137] Air suspension units calculate the pressure difference between the condenser and the evaporator.

[0138] When the pressure difference of the air suspension unit is greater than the pressure difference threshold, the corresponding exhaust pipeline is controlled to be open.

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

[0140] The pressure of the condenser and the evaporator is obtained through the pressure sensor, and the pressure difference between the two is calculated. If the pressure difference is greater than the pressure difference threshold, the exhaust pipeline corresponding to the liquid supply tank is controlled to be connected. That is, the electronic expansion valve on the exhaust pipeline corresponding to the liquid supply tank is controlled to open. At this time, since the pressure difference between the condenser and the evaporator is large, the opening pressure difference of the electronic expansion valve can be met, and it is conducive to accurate pressure relief. If the pressure difference is less than or equal to the pressure difference threshold, the pressure balance pipeline is controlled to be connected, that is, the third ball valve on the first pressure balance pipe is controlled to open. At this time, since the pressure difference between the condenser and the evaporator is small, the opening pressure difference of the ball valve can be met. In this way, based on the pressure difference between the condenser and the evaporator, the appropriate pipeline is controlled to open for pressure relief, which can ensure the effectiveness and accuracy of pressure relief.

[0141] Combination Fig. 9 As shown, the embodiment of the present disclosure provides another liquid supply method for an air suspension unit, comprising:

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

[0143] S502: The air suspension unit determines a target liquid supply object according to its operating status.

[0144] S503: The air suspension unit supplies liquid to the target liquid supply object according to the liquid supply plan corresponding to the target liquid supply object.

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

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

[0147] If the unit is turned on and the compressor enters the pre-startup preparation stage, the liquid supply tank with the highest liquid level and a liquid level greater than the third preset liquid level among the two liquid supply tanks is determined as the target liquid supply tank. The heating element in the target liquid supply tank is controlled to turn on. At the same time, the valve corresponding to the target liquid supply tank is controlled to close. The heating element enters the working state, and after the suspension pressure difference is established, the compressor enters the starting operation state. In this way, the liquid supply tank with relatively more liquid storage is selected as the target liquid supply tank, and the heating element inside it is turned on to put the liquid supply tank into the working state. This is to avoid insufficient refrigerant in the liquid supply tank and the inability to establish a suspension pressure difference.

[0148] The specific implementation process of the liquid supply method for the air suspension unit provided by the embodiment of the present disclosure is described below by way of example:

[0149] In order to support bearing suspension, the pressure difference between the supply pressure of the supply tank and the pressure of the compressor chamber, that is, the supply pressure differential, needs to be within a preset suspension pressure differential range.

[0150] Stage 1: The unit is turned on and the compressor is running normally

[0151] Assume that the first fluid supply tank currently supplies fluid for the bearing suspension.

[0152] Case 1: If the condenser pressure is greater than the evaporator pressure, the refrigerant can be stored for the liquid supply tank by relying on the pressure difference between the condenser and the evaporator. The control is as follows: The first heating element is allowed to be in working state. According to the pressure difference between the pressure of the first liquid supply tank and the pressure of the compressor cavity, the switch of the first heating element is controlled: when the pressure difference is less than the lower limit of the preset suspension pressure difference range, the first heating element is controlled to turn on. When the pressure difference is greater than the upper limit of the preset suspension pressure difference range, the first heating element is controlled to turn off. In this way, the liquid supply pressure difference of the first liquid supply tank is maintained within the preset suspension pressure difference range. The switch of the first heating element is controlled in this way. Optionally, the upper limit of the preset suspension pressure difference range is 650kPa, and the lower limit of the preset suspension pressure difference range is 450kPa.

[0153] At this time, the second solenoid valve is controlled to open, and the second liquid supply tank is in a state of storing refrigerant by relying on the pressure difference between the condenser and the evaporator. Relying on the pressure difference between the condenser and the evaporator, the refrigerant flows out of the condenser, passes through the second solenoid valve and the one-way valve in sequence and flows into the second liquid supply tank. In the process of storing refrigerant in the second liquid supply tank, the pressure difference between the pressure of the second liquid supply tank and the compressor cavity is calculated in real time. If the pressure difference is greater than the sum of the upper limit of the preset suspension pressure difference range and the second pressure increment, the second electronic expansion valve is controlled to open, and then the second exhaust pipeline is controlled to be connected to relieve the pressure on the second liquid supply tank. If the pressure difference is less than the difference between the upper limit of the preset suspension pressure difference range and the first pressure decrement, the second electronic expansion valve is controlled to close.

[0154] As the liquid level in the second liquid supply tank increases, when the liquid level in the second liquid supply tank is higher than the upper limit liquid level, it means that the second liquid supply tank has stored enough refrigerant. At this time, the second solenoid valve and the second electronic expansion valve are controlled to be closed at the same time. In this way, the second liquid supply tank is controlled to store refrigerant. The premise for executing the logic of storing refrigerant is that the heating element of the corresponding liquid supply tank is in the closed state.

[0155] The refrigerant level in the first liquid supply tank gradually decreases as the bearing is supplied with liquid. When the liquid level reaches the first preset liquid level, it means that the refrigerant in the first liquid supply tank is already very low, and the second liquid supply tank needs to be switched to supply liquid for bearing suspension. At this time, the second heating element in the second liquid supply tank is controlled to be turned on, and the second liquid supply tank exits the state of storing refrigerant. The first pressure difference between the first liquid supply tank and the compressor cavity, and the second pressure difference between the second liquid supply and the compressor cavity are calculated in real time. When the second pressure difference is greater than the first pressure difference, it means that the second liquid supply tank has entered the state of supplying liquid for the bearing. At this time, the second one-way valve on the second liquid discharge pipe will be pushed open, and the first one-way valve on the first liquid discharge pipe will be closed. Control the first heating element to close. Switch to using the second liquid supply tank to supply liquid for the bearing. At the same time, the first liquid supply tank is controlled to enter the state of storing refrigerant. For details, please refer to the control logic of storing refrigerant in the second liquid supply tank. In this way, by executing in this cycle, the bearing suspension supply demand in the normal operation of the compressor can be met.

[0156] Scenario 2: If the pressure ratio of the unit is greater than the pressure ratio threshold, and the pressure of the condenser is greater than the sum of the pressure of the first liquid supply tank and the first pressure increment, the pressure difference between the condenser and the first liquid supply tank can be used to directly supply liquid to the first liquid supply tank. The logic is as follows: When the liquid level of the first liquid supply tank is lower than the second preset liquid level, the first solenoid valve is controlled to open, thereby controlling the first liquid inlet pipe to be conductive. The refrigerant is pressed into the first liquid supply tank. When the liquid level of the first liquid supply tank rises to the upper limit level, the first solenoid valve is controlled to close.

[0157] Stage 2: The unit is shut down and the compressor has stopped running

[0158] At this time, the unit is shut down. In order to start up next time, it is necessary to store refrigerant for the liquid supply tank. The liquid supply tank with the highest liquid level and a liquid level less than the third preset liquid level is determined as the target liquid supply tank. Assuming that the target liquid supply tank is the first liquid supply tank, the first ball valve is controlled to open, and then the third liquid inlet pipe is controlled to be connected so that the first liquid supply tank stores refrigerant. At this time, the refrigerant is stored for the first liquid supply tank by relying on the pressure difference between the condenser and the evaporator and the principle of gravity communicating vessels (the position of the liquid supply tank is lower than the condenser and the evaporator), or if there is no pressure difference between the condenser and the evaporator, only the principle of gravity communicating vessels is relied on. At the same time, the pressure difference between the condenser and the evaporator is calculated. If the pressure difference is greater than the pressure difference threshold, the first electronic expansion valve is controlled to open, thereby connecting the first exhaust pipeline. If the pressure difference is less than or equal to the pressure difference threshold, the third ball valve is controlled to open. When the liquid level of the first liquid supply tank is higher than the upper limit liquid level, the first ball valve is controlled to close.

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

[0160] Stage 3: The unit is turned on and the compressor enters the pre-startup preparation stage

[0161] At this time, it is necessary to establish a bearing pressure differential to make the rotor suspended. Therefore, the liquid levels of the two liquid supply tanks are judged at this time, and the liquid supply tank with the highest liquid level and a liquid level greater than the third preset liquid level is determined as the target liquid supply tank. The heating element in the target liquid supply tank is controlled to turn on. Then the liquid supply tank enters the working state. At the same time, the valve corresponding to the liquid supply tank is controlled to close. After the suspension pressure differential is established, the compressor enters the start-up operation state.

[0162] Combination Fig.10 As shown, the embodiment of the present disclosure provides a liquid supply device 100 for an air suspension unit, comprising: an acquisition module 110, a determination module 120 and a liquid supply module 130. The acquisition module 110 is configured to acquire the operating state of the air suspension unit. The determination module 120 is configured to determine the target liquid supply object according to the operating state of the air suspension unit. The liquid supply module 130 is configured to supply liquid to the target liquid supply object according to the liquid supply scheme corresponding to the target liquid supply object.

[0163] The liquid supply device for the air suspension unit provided by the embodiment of the present disclosure is used to determine the target liquid supply object based on the operating state of the air suspension unit, and then match the liquid supply scheme corresponding to the target liquid supply object, and supply liquid to the target liquid supply object according to the liquid supply scheme. The target liquid supply object includes a bearing and two liquid supply tanks. The liquid outlet sides of the two liquid supply tanks are both connected to the liquid inlet side of the bearing of the compressor. In this way, a suitable liquid supply scheme can be selected for liquid supply based on the target liquid supply object. Moreover, when the target liquid supply object is a liquid supply tank, the pressure difference between the condenser and the evaporator can be used to supply liquid to the two liquid supply tanks. In this way, even if a gear pump is not used, a stable liquid supply source can be guaranteed, and problems such as aging and failure of the gear pump can be avoided.

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

[0165] In addition, the logic instructions in the memory 112 described above may be implemented in the form of software functional units and when sold or used as independent products, may be stored in a computer-readable storage medium.

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

[0167] The memory 112 may include a program storage area and a data storage area, wherein the program storage area may store an operating system and an application required for at least one function; the data storage area may store data created according to the use of the terminal device, etc. In addition, the memory 112 may include a high-speed random access memory and may also include a non-volatile memory.

[0168] Combination Fig.12 As shown, the embodiment of the present disclosure provides an air suspension unit 1200, including: an air suspension unit body, and the above-mentioned liquid supply device 100 (1100) for the air suspension unit. The liquid supply device 100 (1100) for the air suspension unit is installed in the air suspension unit body. The installation relationship described here is not limited to placement inside the product, but also includes installation connections with other components of the product, including but not limited to physical connection, electrical connection or signal transmission connection, etc. It can be understood by those skilled in the art that the liquid supply device 100 (1100) for the air suspension unit can be adapted to a feasible product body, thereby realizing other feasible embodiments.

[0169] The embodiment of the present disclosure provides a computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are configured to execute the above-mentioned liquid supply method for an air suspension unit.

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

[0171] The technical solution of the embodiment of the present disclosure can be embodied in the form of a software product, which is stored in a storage medium and includes one or more instructions for enabling a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in the embodiment of the present disclosure. The aforementioned storage medium may be a non-transient storage medium, including: a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and other media that can store program codes, or a transient storage medium.

[0172] The above description and the accompanying drawings fully illustrate the embodiments of the present disclosure so that those skilled in the art can practice them. Other embodiments may include structural, logical, electrical, process and other changes. The embodiments represent only possible changes. Unless explicitly required, separate components and functions are optional, and the order of operation may vary. The parts and features of some embodiments may be included in or replace the parts and features of other embodiments. Moreover, the words used in this application are only used to describe the embodiments and are not used to limit the claims. As used in the description of the embodiments and the claims, unless the context clearly indicates, the singular forms of "a", "an" and "the" are intended to include plural forms as well. Similarly, the term "and / or" as used in this application refers to any and all possible combinations of listings containing one or more associated ones. In addition, when used in the present application, the term "comprise" and its variants "comprises" and / or comprising refer to the presence of stated features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or groups thereof. In the absence of further restrictions, the elements defined by the sentence "comprising a ..." do not exclude the presence of other identical elements in the process, method or device comprising the elements. In this article, each embodiment may focus on the differences from other embodiments, and the same and similar parts between the various embodiments may refer to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method part disclosed in the embodiments, then the relevant parts can refer to the description of the method part.

[0173] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software may depend on the specific application and design constraints of the technical solution. The technicians may use different methods for each specific application to implement the described functions, but such implementations should not be considered to exceed the scope of the embodiments of the present disclosure. The technicians may clearly understand that, for the convenience and simplicity of description, the specific working processes of the systems, devices and units described above may refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here.

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

[0175] The flowchart and block diagram in the accompanying drawings show the possible architecture, function and operation of the system, method and computer program product according to the embodiment of the present disclosure. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of the code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. In some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, which can depend on the functions involved. In the description corresponding to the flowchart and the block diagram in the accompanying drawings, the operations or steps corresponding to different boxes can also occur in a different order from the order disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, which can depend on the functions involved. Each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, may be implemented by a dedicated hardware-based system that performs the specified functions or actions, or may be implemented by a combination of dedicated hardware and computer instructions.

Claims

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

2. The liquid supply method according to claim 1, characterized in that: The operating status of the air suspension unit includes: the on / off status of the air suspension unit, the operating status of the compressor and the pressure of the condenser; The step of determining the target liquid supply object according to the operating state of the air suspension unit includes: When the unit is turned on and the compressor is operating normally, the target liquid supply object is determined according to the pressure of the condenser; When the unit is shut down and the compressor is stopped, the target liquid supply object is determined to be a liquid supply tank that meets the preset conditions.

3. The liquid supply method according to claim 2, characterized in that: The step of determining the target liquid supply object according to the pressure of the condenser comprises: When the pressure of the condenser is greater than the pressure of the evaporator, the target liquid supply objects are determined to be the bearing and two liquid supply tanks; When the pressure of the condenser is greater than the pressure threshold, if the pressure ratio of the air suspension unit is greater than the pressure ratio threshold, the target liquid supply objects are determined to be the bearing and the working liquid supply tank; wherein the working liquid supply tank is the liquid supply tank that is supplying liquid to the bearing.

4. The liquid supply method according to claim 1, characterized in that: The target fluid supply objects are the bearings and two fluid supply tanks; The step of supplying liquid to the target liquid supply object according to the liquid supply scheme corresponding to the target liquid supply object comprises: Control the two fluid supply tanks to supply fluid to the bearing alternately; and, The condenser is controlled to supply liquid to the non-operating liquid supply tank; wherein the non-operating liquid supply tank is a liquid supply tank that does not supply liquid to the bearing.

5. The liquid supply method according to claim 4, characterized in that: Heating elements are provided in both liquid supply tanks; The controlling of the two fluid supply tanks to alternately supply fluid to the bearing comprises: Get the liquid level in the working supply tank; When the liquid level reaches a first preset liquid level, controlling the heating element of the non-operating liquid supply tank to turn on, so that the non-operating liquid supply tank enters an operating state; In the case of ΔPw>ΔPg, the heating element in the original working liquid supply tank is controlled to be turned off, so that the corresponding liquid supply tank exits the working state; Among them, ΔPw is the pressure difference between the pressure of the non-working liquid supply tank after entering the working state and the pressure of the compressor cavity, and ΔPg is the pressure difference between the pressure of the original working liquid supply tank and the pressure of the compressor cavity.

6. The liquid supply method according to claim 4, characterized in that: The condenser is connected to two liquid supply tanks through two liquid replenishing pipelines respectively; The control condenser supplies liquid to the non-operating liquid supply tank, comprising: Control the conduction of the liquid replenishment pipeline corresponding to the non-operating liquid supply tank; When the liquid level of the non-operating liquid supply tank reaches the upper limit liquid level, the corresponding liquid replenishing pipeline is controlled to be disconnected.

7. The liquid supply method according to claim 6, characterized in that: The top of the non-operating liquid supply tank is connected to the bypass pressure relief pipeline; In the case where the control of the liquid replenishing pipeline corresponding to the non-operating liquid supply tank is connected, the control of the condenser to supply liquid to the non-operating liquid supply tank further includes: Obtaining the pressure difference between the pressure of the non-operating fluid supply tank and the pressure of the compressor cavity; The opening or closing of the bypass pressure relief line is controlled according to the pressure difference.

8. The liquid supply method according to claim 1, characterized in that: The target liquid supply object is the liquid supply tank in operation; the condenser is connected to the two liquid supply tanks through two liquid replenishment pipelines respectively; The step of supplying liquid to the target liquid supply object according to the liquid supply scheme corresponding to the target liquid supply object comprises: When the liquid level of the working liquid supply tank is lower than the second preset liquid level, controlling the liquid replenishment pipeline corresponding to the working liquid supply tank to be connected; When the liquid level of the working liquid supply tank reaches the upper limit level, the corresponding liquid replenishment pipeline is controlled to be disconnected.

9. The liquid supply method according to claim 1, characterized in that: The target liquid supply object is a liquid supply tank that meets the preset conditions; the air suspension unit also includes an evaporator, and the condenser and the evaporator are respectively connected to the two liquid supply tanks through two liquid storage pipelines; the tops of the two liquid supply tanks are respectively connected to two bypass pressure relief pipelines; The step of supplying liquid to the target liquid supply object according to the liquid supply scheme corresponding to the target liquid supply object comprises: Controlling the conduction of the liquid storage pipeline and the bypass pressure relief pipeline corresponding to the liquid supply tank that meets the preset conditions, so as to supply liquid to the liquid supply tank that meets the preset conditions; When the liquid level of the liquid supply tank that meets the preset conditions reaches the upper limit liquid level, the corresponding liquid storage pipeline and bypass pressure relief pipeline are controlled to be disconnected.

10. The liquid supply method according to claim 9, characterized in that: The bypass pressure relief pipeline includes: an exhaust pipeline and a pressure balance pipeline, wherein the conduction pressure of the exhaust pipeline is greater than the conduction pressure of the pressure balance pipeline; The controlling of the bypass pressure relief pipeline corresponding to the liquid supply tank meeting the preset conditions comprises: Calculate the pressure difference between the condenser and the evaporator; When the pressure difference is greater than the pressure difference threshold, the corresponding exhaust pipeline is controlled to be open; When the pressure difference is less than or equal to the pressure difference threshold, the pressure balance pipeline is controlled to be open.

11. The liquid supply method according to any one of claims 1 to 10, characterized in that: Heating elements are provided in both liquid supply tanks; the operating state of the air suspension unit includes: the on / off state of the air suspension unit and the operating state of the compressor; After obtaining the operating status of the air suspension unit, the liquid supply method further includes: When the unit is started and the compressor enters the pre-startup preparation stage, the liquid supply tank with the highest liquid level and a liquid level greater than a third preset liquid level is determined as the target liquid supply tank; Control the heating element in the target liquid supply tank to turn on.

12. A liquid supply device for an air suspension unit, comprising a processor and a memory storing program instructions, characterized in that: The processor is configured to execute the liquid supply method for an air suspension unit according to any one of claims 1 to 11 when running the program instructions.

13. An air suspension unit, characterized in that: include: The air suspension unit body includes: a condenser and a liquid supply system; The liquid supply system includes: two liquid supply tanks; wherein the liquid outlet sides of the two liquid supply tanks are connected to the liquid inlet sides of the bearings of the compressor to supply liquid to the bearings; the liquid outlet side of the condenser is connected to the liquid inlet sides of the two liquid supply tanks to supply liquid to the two liquid supply tanks; and, The liquid supply device for an air suspension unit according to claim 12 is installed on the air suspension unit body.

14. A storage medium storing program instructions, characterized in that: When the program instructions are executed, the liquid supply method for an air suspension unit according to any one of claims 1 to 11 is executed.

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