Air suspension bearing fluid supply system and its control method, air conditioning system

Abstract

This disclosure provides a fluid supply system for an air-suspension bearing compressor and its control method, as well as an air conditioning system. The air-suspension bearing fluid supply system includes: a compressor, comprising a compressor housing, a shaft, and an air-suspension bearing, the compressor housing having a fluid inlet and a fluid outlet; a condenser, the condenser's refrigerant inlet being connected to the compressor's refrigerant outlet, and the condenser's refrigerant outlet being connected to the fluid inlet; an evaporator, having a first refrigerant port, a second refrigerant port, and a third refrigerant port, the first refrigerant port being connected to the condenser's refrigerant outlet, the second refrigerant port being connected to the fluid outlet, and the third refrigerant port being connected to the compressor's refrigerant inlet; a first pipeline, the inlet end of which is connected to the condenser's refrigerant outlet, and the outlet end of which is connected to the fluid inlet; a second pipeline, the inlet end of which is connected between the condenser's refrigerant inlet and the compressor's refrigerant outlet, and the outlet end of which is connected to the fluid inlet; and an operating device configured to selectively connect or disconnect the first and second pipelines.

Description

Technical Field

[0001] This disclosure relates to the field of air conditioning equipment technology, and in particular to an air suspension bearing fluid supply system and its control method, and an air conditioning system. Background Technology

[0002] Centrifugal chillers are commonly used in various building air conditioning systems. Currently, the compressor bearings of centrifugal chillers mainly use oil-lubricated bearings and magnetic levitation bearings. In recent years, gas bearings, also known as air suspension bearings, have also become popular.

[0003] Air bearings utilize gas force to support the rotating shaft, offering the following advantages: 1. Compared to compressors using oil-lubricated bearings, they eliminate the need for oil supply, return, and cooling systems, thus eliminating the risk of lubricant leakage and saving on lubrication maintenance. During operation, the bearing is suspended, resulting in zero friction, reduced mechanical losses, and improved unit performance; 2. Compared to compressors using magnetic bearings, they eliminate the need for complex electrical control systems and abnormal power failure protection systems, and the bearing size is relatively smaller.

[0004] To ensure the normal operation of air suspension bearings, a reliable and stable fluid supply system is required to supply air to the bearings. However, the fluid supply systems in related technologies suffer from periodic fluctuations in air supply pressure, and are also complex in structure, expensive, and have a short service life. Summary of the Invention

[0005] The purpose of this disclosure is to provide a fluid supply system for an air suspension bearing and its control method, as well as an air conditioning system, which can maintain the pressure stability of the air suspension bearing.

[0006] The first aspect of this disclosure provides a fluid supply system for an air-bearing compressor, comprising:

[0007] A compressor includes a compressor housing, a shaft, and an air suspension bearing. The compressor housing has a fluid inlet for supplying refrigerant to the air suspension bearing and a fluid outlet for recovering refrigerant discharged from the air suspension bearing. The air suspension bearing is configured to support the shaft.

[0008] A condenser, wherein the refrigerant inlet of the condenser is connected to the refrigerant outlet of the compressor, and the refrigerant outlet of the condenser is connected to the fluid inlet;

[0009] An evaporator has a first refrigerant port, a second refrigerant port, and a third refrigerant port. The first refrigerant port of the evaporator is connected to the refrigerant outlet of the condenser, the second refrigerant port of the evaporator is connected to the fluid outlet, and the third refrigerant port of the evaporator is connected to the refrigerant inlet of the compressor.

[0010] The first pipeline has its inlet end connected to the refrigerant outlet of the condenser and its outlet end connected to the fluid inlet.

[0011] The second pipeline has its inlet end connected between the refrigerant inlet of the condenser and the refrigerant outlet of the compressor, and its outlet end connected to the fluid inlet; and

[0012] The operating device is configured to selectively connect or disconnect the first conduit and the second conduit.

[0013] According to some embodiments of this disclosure, the operating device includes:

[0014] A refrigerant pump, disposed on the first pipeline and configured to deliver refrigerant from the condenser to the fluid inlet; and / or

[0015] A first control valve is disposed on the second pipeline and configured to control the on / off state of the second pipeline.

[0016] According to some embodiments of this disclosure

[0017] The first control valve includes a solenoid valve configured to connect or disconnect the second pipeline; or

[0018] The first control valve includes a check valve configured to unidirectionally connect the second pipeline from the refrigerant outlet of the compressor to the fluid inlet.

[0019] According to some embodiments of this disclosure, it also includes:

[0020] A first pressure detection device is configured to acquire the motor cavity pressure P2 of the compressor;

[0021] A second pressure detection device is configured to acquire the condensing pressure P3 of the condenser; and

[0022] The first control module, which is signal-connected to the first pressure detection device and the second pressure detection device, is configured to selectively connect or disconnect the first pipeline and the second pipeline according to the operating state of the compressor, the motor cavity pressure P2 of the compressor and the condensing pressure P3 of the condenser.

[0023] According to some embodiments of this disclosure, it also includes:

[0024] A first pressure detection device is configured to acquire the motor cavity pressure P2 of the compressor;

[0025] A third pressure detection device, configured to acquire the outlet pressure P1 of the refrigerant pump; and

[0026] The second control module, which is signal-connected to the first pressure detection device and the third pressure detection device, is configured to adjust the speed of the refrigerant pump based on the difference between the outlet pressure P1 and the motor cavity pressure P2 of the compressor.

[0027] According to some embodiments of this disclosure, a second control valve is provided between the refrigerant outlet of the compressor and the refrigerant inlet of the condenser, and the second control valve is a one-way valve.

[0028] According to some embodiments of this disclosure, it also includes:

[0029] An expansion valve has its inlet end connected to the refrigerant outlet of the condenser and its outlet end connected to the first refrigerant port of the evaporator.

[0030] The bypass pipe has its inlet end connected to the first refrigerant port of the evaporator and its outlet end connected to the refrigerant outlet of the condenser; and

[0031] A bypass valve is provided on the bypass line and configured to connect or disconnect the bypass line.

[0032] A second aspect of this disclosure provides an air conditioning system including the air suspension bearing fluid supply system described in the first aspect of this disclosure.

[0033] A third aspect of this disclosure provides a control method for the fluid supply system of the air suspension bearing described in the first aspect of this disclosure, comprising: selectively connecting or disconnecting the first pipeline and the second pipeline to determine whether the fluid inlet of the air suspension bearing is supplied with liquid through the first pipeline or with air through the second pipeline.

[0034] According to some embodiments of this disclosure

[0035] The control method further includes acquiring the operating status of the compressor, the operating status including a shutdown state and a stable operating state;

[0036] Based on at least one of the operating state, the outlet pressure P1 of the refrigerant pump, the motor cavity pressure P2 of the compressor, and the condensing pressure P3 of the condenser, the first pipeline and the second pipeline are selectively connected or disconnected.

[0037] According to some embodiments of this disclosure, after the compressor is started and before it reaches the stable operating state, and P3-P2<P0, the first pipeline is connected and the second pipeline is disconnected, wherein P0 represents the target value of the difference between the outlet pressure P1 of the refrigerant pump and the motor cavity pressure P2 of the compressor.

[0038] According to some embodiments of this disclosure, when the compressor is in the stable operating state...

[0039] If P3 - P2 < P0, connect the first pipeline and disconnect the second pipeline; and / or

[0040] If P3-P2≥P0, connect the second pipeline and disconnect the first pipeline;

[0041] Wherein, P0 represents the target value of the difference between the condensing pressure P3 of the condenser and the motor cavity pressure P2 of the compressor, or the target value of the difference between the outlet pressure P1 of the refrigerant pump and the motor cavity pressure P2 of the compressor.

[0042] According to some embodiments of this disclosure, after the compressor is turned off and before it reaches the shutdown state, the first pipeline is connected and the second pipeline is disconnected.

[0043] According to some embodiments of this disclosure, connecting the first pipeline includes: adjusting the rotational speed of the refrigerant pump installed on the first pipeline according to the difference between the outlet pressure P1 of the refrigerant pump and the motor cavity pressure P2 of the compressor, until the difference reaches the target value P0.

[0044] According to some embodiments of this disclosure, when the compressor is in a stable operating state and the refrigerant pump stops working due to a malfunction, the second pipeline is connected, the pipeline between the condenser and the compressor is disconnected, and the pipeline between the condenser and the evaporator is disconnected.

[0045] The air-suspension bearing fluid supply system provided in this embodiment has the following two air supply paths: 1. Condenser - First pipeline - Air-suspension bearing - Evaporator; 2. Compressor - Second pipeline - Air-suspension bearing - Evaporator. Different air and liquid supply paths can be switched according to different operating states of the air conditioning unit. The fluid supply system has a simple structure and can make the air supply to the air-suspension bearing more stable, effectively improving the reliability of the unit. The control method and air conditioning system of the air-suspension bearing fluid supply system provided in this embodiment have the advantages of the aforementioned air-suspension fluid supply system.

[0046] Other features and advantages of this disclosure will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0047] The accompanying drawings, which are included to provide a further understanding of this disclosure and form part of this application, illustrate exemplary embodiments of this disclosure and are used to explain this disclosure, but do not constitute an undue limitation of this disclosure. In the drawings:

[0048] Figure 1 This is a schematic diagram of the structure of a fluid supply system for an air suspension bearing according to some embodiments of this disclosure.

[0049] Figure 2 This is a schematic diagram of the structure of the air suspension bearing fluid supply system according to other embodiments of this disclosure.

[0050] Figure 1 and Figure 2 In the figures, the labels represent:

[0051] 1. Compressor; 2. Condenser; 3. Expansion valve; 4. Evaporator; 5. Refrigerant pump; 6. First control valve; 7. Second control valve; 8. First filter; 9. Second filter; 10. Bypass valve; 11. First pressure detection device; 12. Second pressure detection device; 13. Third pressure detection device; 14. Fourth pressure detection device; L1. First pipeline; L2. Second pipeline; K1. Fluid inlet; K2. Fluid outlet. Detailed Implementation

[0052] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this disclosure or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0053] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of this disclosure. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0054] In the description of this disclosure, it should be understood that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this disclosure.

[0055] In the description of this disclosure, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings and is only for the convenience of describing this disclosure and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this disclosure; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0056] like Figures 1 to 2 As shown, some embodiments of this disclosure provide a compressor air suspension bearing fluid supply system, including a compressor 1, a condenser 2, an evaporator 4, a first pipeline L1, a second pipeline L2, and an operating device.

[0057] The compressor 1 includes a compressor housing, a rotating shaft, and an air suspension bearing. The compressor housing has a fluid inlet K1 for supplying refrigerant to the air suspension bearing and a fluid outlet K2 for recovering refrigerant discharged from the air suspension bearing. The air suspension bearing is configured to support the rotating shaft.

[0058] The refrigerant inlet of condenser 2 is connected to the refrigerant outlet of compressor 1, and the refrigerant outlet of condenser 2 is connected to the fluid inlet K1.

[0059] Evaporator 4 has a first refrigerant port, a second refrigerant port and a third refrigerant port. The first refrigerant port of evaporator 4 is connected to the refrigerant outlet of condenser 2, the second refrigerant port of evaporator 4 is connected to the fluid outlet K2, and the third refrigerant port of evaporator 4 is connected to the refrigerant inlet of compressor 1.

[0060] The inlet end of the first pipeline L1 is connected to the refrigerant outlet of the condenser 2, and the outlet end is connected to the fluid inlet K1;

[0061] The inlet end of the second pipeline L2 is connected between the refrigerant inlet of the condenser 2 and the refrigerant outlet of the compressor 1, and the outlet end is connected to the fluid inlet K1.

[0062] The operating device is configured to selectively connect or disconnect the first conduit L1 and the second conduit L2.

[0063] The air suspension bearing fluid supply system provided in this embodiment has the following two air supply paths: 1. Condenser - First pipeline - Air suspension bearing - Evaporator; 2. Compressor - Second pipeline - Air suspension bearing - Evaporator. Different air and liquid supply paths can be switched according to different operating states of the air conditioning unit. The fluid supply system has a simple structure and can make the air suspension bearing air supply more stable, effectively improving the reliability of the unit.

[0064] In some embodiments, such as Figure 1 and Figure 2 As shown, the operating device includes a refrigerant pump 5, which is installed on the first pipeline L1 and configured to deliver refrigerant from the condenser 2 to the fluid inlet K1.

[0065] In some embodiments, the operating device includes a first control valve 6, which is disposed on the second pipeline L2 and configured to control the on / off state of the second pipeline L2.

[0066] When the refrigerant pump 5 is in the start state, the air-suspended fluid supply system can connect the first pipeline L1, and vice versa. When the first control valve 6 is in the open state, the air-suspended fluid supply system can connect the second pipeline L2, and vice versa.

[0067] In some embodiments, such as Figure 1 As shown, the first control valve 6 includes a solenoid valve configured to connect or disconnect the second pipeline L2.

[0068] In other embodiments, such as Figure 2 As shown, the first control valve 6 includes a check valve configured to unidirectionally connect the second pipeline L2 from the refrigerant outlet of the compressor 1 to the fluid inlet K1.

[0069] Figure 1 and Figure 2 In the embodiment shown, the air suspension bearing fluid supply system may further include a first filter 8 disposed between the refrigerant outlet of the condenser 2 and the refrigerant inlet of the refrigerant pump 5, and a second filter 9 disposed upstream of the fluid inlet K2.

[0070] In some embodiments, the air suspension bearing fluid supply system further includes a first pressure detection device 11, a second pressure detection device 12, and a first control module. The first pressure detection device 11 is configured to acquire the motor cavity pressure P2 of the compressor 1. The second pressure detection device 12 is configured to acquire the condensing pressure P3 of the condenser 2. The first control module is signal-connected to the first pressure detection device 11 and the second pressure detection device 12, and is configured to selectively connect or disconnect the first pipeline L1 and the second pipeline L2 according to the operating state of the compressor 1, the motor cavity pressure P2 of the compressor 1, and the condensing pressure P3 of the condenser 2.

[0071] In some embodiments, the air suspension bearing fluid supply system further includes a first pressure detection device 11, a third pressure detection device 13, and a second control module. The first pressure detection device 11 is configured to acquire the motor cavity pressure P2 of the compressor 1. The third pressure detection device 13 is configured to acquire the outlet pressure P1 of the refrigerant pump 5. The second control module is signal-connected to the first pressure detection device 11 and the third pressure detection device 13, and is configured to adjust the rotational speed of the refrigerant pump 5 based on the difference between the outlet pressure P1 and the pressures of the fluid inlet K1 and the fluid outlet K2.

[0072] Figure 1 and Figure 2 In the illustrated embodiment, the air suspension bearing fluid supply system may further include a fourth pressure detection device 14, which is configured to acquire the evaporation pressure P4 of the evaporator 4.

[0073] In some embodiments, a second control valve 7 is provided between the refrigerant outlet of the compressor 1 and the refrigerant inlet of the condenser 2, and the second control valve 7 is a one-way valve.

[0074] In the above embodiments, regardless of whether the air suspension bearing fluid supply system supplies air to the air suspension bearing through the first pipeline L1 or the second pipeline L2, the second control valve 7 can ensure that the high-pressure refrigerant gas at the refrigerant outlet of the compressor 1 can be stably introduced into the first pipeline L1 or the second pipeline L2.

[0075] In some embodiments, such as Figure 2 As shown, the air suspension bearing fluid supply system also includes an expansion valve 3, a bypass pipeline, and a bypass valve 10. The inlet end of the expansion valve 3 is connected to the refrigerant outlet of the condenser 2, and the outlet end is connected to the first refrigerant port of the evaporator 4. The inlet end of the bypass pipeline is connected to the first refrigerant port of the evaporator 4, and the outlet end is connected to the refrigerant outlet of the condenser 2. The bypass valve 10 is located on the bypass pipeline and is configured to connect or disconnect the bypass pipeline.

[0076] In the above embodiments, under normal conditions, compressor 1, condenser 2, expansion valve 3, and evaporator 4 form a refrigeration circuit. Since the bypass line is connected in parallel across the expansion valve 3, bypass valve 10 controls the opening and closing of the bypass line. When the liquid refrigerant in condenser 2 is insufficient, bypass valve 10 can be opened to allow the bypass line to flow from evaporator 4 to condenser 2, thus ensuring that the liquid refrigerant in evaporator 4 can flow to condenser 2 in a timely manner through the bypass line, guaranteeing that condenser 2 stores sufficient refrigerant for supplying the air suspension bearing. Bypass valve 10 can be a solenoid valve.

[0077] Some embodiments of this disclosure also provide an air conditioning system including the aforementioned air-suspension bearing fluid supply system. For example, the air conditioning system may be a building air conditioning system comprising a centrifugal water-cooled unit. This air conditioning system has the advantages of the aforementioned air-suspension fluid supply system.

[0078] Some embodiments of this disclosure also provide a control method for the aforementioned air suspension bearing fluid supply system, including selectively connecting or disconnecting the first pipeline L1 and the second pipeline L2 to determine whether the fluid inlet K1 of the air suspension bearing is supplied with liquid through the first pipeline L1 or with air through the second pipeline L2. This control method has the advantages of the aforementioned air suspension fluid supply system.

[0079] The control method of the air suspension bearing fluid supply system is further explained below. To ensure the normal suspension operation of the air suspension bearing, the air supply pressure difference (i.e., the pressure at the fluid inlet K1 - the pressure at the fluid outlet K2) must be maintained within a certain range. Different air supply paths are switched according to different stages of air conditioning unit operation. The different stages of unit operation can be determined by referring to the operating status of compressor 1.

[0080] In some embodiments, the control method further includes acquiring the operating state of the compressor 1, including a shutdown state and a stable operating state; and selectively connecting or disconnecting the first pipeline L1 and the second pipeline L2 according to at least one of the operating state, the outlet pressure P1 of the refrigerant pump 5, the motor cavity pressure P2 of the compressor 1, and the condensing pressure P3 of the condenser 2.

[0081] In the above embodiments, the operating state of compressor 1 can be obtained in various ways. For example, the operating state of compressor 1 can be determined by the real-time rotational speed of compressor 1's shaft and the changes in rotational speed. A real-time rotational speed of 0 indicates a stopped state, while a real-time rotational speed above a certain set value indicates a stable operating state.

[0082] In some embodiments of the control method, after the compressor 1 is started and before it reaches a stable operating state, and P3-P2<P0, the first pipeline L1 is connected and the second pipeline L2 is disconnected, where P0 represents the target value of the difference between the outlet pressure P1 of the refrigerant pump 5 and the motor cavity pressure P2 of the compressor 1.

[0083] Figure 1 and Figure 2 In the embodiment shown, when the air conditioning unit is in the start-up phase, the compressor 1 has not yet reached a stable operating state. At this time, the refrigerant pump 5 is turned on to connect the first pipeline L1, and the liquid refrigerant in the condenser 2 is pressurized by the refrigerant pump 5 and supplied to the air suspension bearing. After the compressor shaft is suspended, the compressor motor is started to start the compressor and the refrigeration cycle is started.

[0084] In some embodiments of the control method, when the compressor 1 is in a stable operating state, if P3-P2<P0, the first pipeline L1 is connected and the second pipeline L2 is disconnected.

[0085] In some embodiments of the control method, when the compressor 1 is in a stable operating state, if P3-P2≥P0, the second pipeline L2 is connected and the first pipeline L1 is disconnected.

[0086] Wherein, P0 represents the target value of the difference between the condensing pressure P3 of condenser 2 and the motor cavity pressure P2 of compressor 1, or the target value of the difference between the outlet pressure P1 of refrigerant pump 5 and the motor cavity pressure P2 of compressor 1.

[0087] Figure 1 and Figure 2 In the embodiment shown, when the air conditioning unit is in a stable operating phase, the compressor is in a stable operating state accordingly. When the difference between the condensing pressure P3 of the condenser 2 and the motor cavity pressure P2 of the compressor 1 reaches a certain value, or when the difference between the outlet pressure P1 of the refrigerant pump 5 and the motor cavity pressure P2 of the compressor 1 reaches a certain value, it indicates that the high-pressure gaseous refrigerant generated by the compressor 1 is sufficient to provide the pressure to suspend the shaft. By opening the first control valve 6 to connect the second pipeline L2, the compressor 1 can provide high-pressure gaseous refrigerant to the air suspension bearing through the second pipeline L2.

[0088] In some embodiments of the control method, after the compressor 1 is turned off and before it reaches the stop state, the first pipeline L1 is connected and the second pipeline L2 is disconnected.

[0089] In some embodiments of the control method, connecting the first pipeline L1 includes: adjusting the speed of the refrigerant pump 5 installed on the first pipeline L1 according to the difference between the outlet pressure P1 of the refrigerant pump 5 and the motor cavity pressure P2 of the compressor 1 until the difference reaches the target value P0.

[0090] In some embodiments of the control method, when the compressor 1 is in a stable operating state and the refrigerant pump 5 stops working due to a fault, the second pipeline L2 is connected, the pipeline between the condenser 2 and the compressor 1 is disconnected, and the pipeline between the condenser 2 and the evaporator 4 is disconnected.

[0091] In the above embodiment, at the instant the refrigerant pump 5 fails and stops, the second pipeline L2 is connected, and all pipelines between the compressor 1 and the evaporator 4 connected to the condenser 2 are disconnected, thus stopping the refrigeration cycle. For example, Figure 1 and Figure 2In the embodiment shown, except for the first control valve 6 on the second pipeline L2 being open, all valves on other related pipelines connected to the condenser 2 are closed, such as the expansion valve 3 and the second control valve 7. At this time, the high-pressure gaseous refrigerant remaining in the condenser 2 when the machine is stopped can be used to continue supplying gas to the air suspension bearing until the compressor motor stops running. This avoids the bearing from being unable to levitate properly while the motor is still running, which could lead to bearing wear and damage.

[0092] In some embodiments, the first control module and the second control module described above may be implemented as a general-purpose processor, a programmable logic controller (PLC), a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or any suitable combination thereof for performing the functions described herein.

[0093] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure and not to limit them; although this disclosure has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this disclosure or equivalent substitutions can be made to some technical features, all of which should be covered within the scope of the technical solutions claimed in this disclosure.

Claims

1. A fluid supply system for an air-bearing compressor, characterized in that, include: The compressor (1) includes a compressor housing, a rotating shaft, and an air suspension bearing. The compressor housing has a fluid inlet (K1) for supplying refrigerant to the air suspension bearing and a fluid outlet (K2) for recovering refrigerant discharged from the air suspension bearing. The air suspension bearing is configured to support the rotating shaft. The condenser (2) has a refrigerant inlet connected to the refrigerant outlet of the compressor (1) and a refrigerant outlet connected to the fluid inlet (K1). The evaporator (4) has a first refrigerant port, a second refrigerant port and a third refrigerant port. The first refrigerant port of the evaporator (4) is connected to the refrigerant outlet of the condenser (2), the second refrigerant port of the evaporator (4) is connected to the fluid outlet (K2), and the third refrigerant port of the evaporator (4) is connected to the refrigerant inlet of the compressor (1). The first pipeline (L1) has its inlet end connected to the refrigerant outlet of the condenser (2) and its outlet end connected to the fluid inlet (K1). The second pipeline (L2) has its inlet end connected between the refrigerant inlet of the condenser (2) and the refrigerant outlet of the compressor (1), and its outlet end connected to the fluid inlet (K1). and The operating device is configured to selectively connect or disconnect the first conduit (L1) and the second conduit (L2).

2. The air suspension bearing fluid supply system according to claim 1, characterized in that, The control device includes: A refrigerant pump (5), disposed on the first pipeline (L1) and configured to deliver refrigerant from the condenser (2) to the fluid inlet (K1); and / or A first control valve (6) is disposed on the second pipeline (L2) and configured to control the opening and closing of the second pipeline (L2).

3. The air suspension bearing fluid supply system according to claim 2, characterized in that, The first control valve (6) includes a solenoid valve configured to connect or disconnect the second pipeline (L2); or The first control valve (6) includes a check valve configured to allow the second line (L2) to be unidirectionally connected from the refrigerant outlet of the compressor (1) to the fluid inlet (K1).

4. The air suspension bearing fluid supply system according to claim 1, characterized in that, Also includes: A first pressure detection device (11) is configured to acquire the motor cavity pressure P2 of the compressor (1); The second pressure detection device (12) is configured to obtain the condensing pressure P3 of the condenser (2); and The first control module, which is connected to the first pressure detection device (11) and the second pressure detection device (12) by signal, is configured to selectively connect or disconnect the first pipeline (L1) and the second pipeline (L2) according to the working state of the compressor (1), the motor cavity pressure P2 of the compressor (1) and the condensing pressure P3 of the condenser (2).

5. The air suspension bearing fluid supply system according to claim 2, characterized in that, Also includes: A first pressure detection device (11) is configured to acquire the motor cavity pressure P2 of the compressor (1); A third pressure detection device (13) is configured to acquire the outlet pressure P1 of the refrigerant pump (5); and The second control module, which is connected to the third pressure detection device (13) by signal, is configured to adjust the speed of the refrigerant pump (5) according to the difference between the outlet pressure P1 and the motor cavity pressure P2 of the compressor (1).

6. The air suspension bearing fluid supply system according to any one of claims 1 to 5, characterized in that, A second control valve (7) is provided between the refrigerant outlet of the compressor (1) and the refrigerant inlet of the condenser (2). The second control valve (7) is a one-way valve.

7. The air suspension bearing fluid supply system according to any one of claims 1 to 5, characterized in that, Also includes: The expansion valve (3) has its inlet end connected to the refrigerant outlet of the condenser (2) and its outlet end connected to the first refrigerant port of the evaporator (4). A bypass pipe is connected at its inlet to the first refrigerant port of the evaporator (4) and at its outlet to the refrigerant outlet of the condenser (2); and A bypass valve (10) is provided on the bypass line and configured to connect or disconnect the bypass line.

8. An air conditioning system, characterized in that, Includes the air suspension bearing fluid supply system according to any one of claims 1 to 7.

9. A control method for a fluid supply system for an air-suspended bearing according to any one of claims 1 to 7, characterized in that, include: The first pipeline (L1) and the second pipeline (L2) are selectively connected or disconnected to determine whether the fluid inlet (K1) of the air suspension bearing is supplied with liquid through the first pipeline (L1) or with air through the second pipeline (L2).

10. The control method for the fluid supply system of the air suspension bearing according to claim 9, characterized in that, The operating device includes a refrigerant pump (5), which is disposed on the first pipeline (L1) and configured to deliver the refrigerant of the condenser (2) to the fluid inlet (K1). The air suspension bearing fluid supply system also includes a first pressure detection device (11), a second pressure detection device (12) and a third pressure detection device (13). The first pressure detection device (11) is configured to obtain the motor cavity pressure P2 of the compressor (1), the second pressure detection device (12) is configured to obtain the condensing pressure P3 of the condenser (2), and the third pressure detection device (13) is configured to obtain the outlet pressure P1 of the refrigerant pump (5). The control method further includes: Obtain the operating status of the compressor (1), which includes a shutdown state and a stable operating state; Based on at least one of the operating state, the outlet pressure P1 of the refrigerant pump (5), the motor cavity pressure P2 of the compressor (1), and the condensing pressure P3 of the condenser (2), the first pipeline (L1) and the second pipeline (L2) are selectively connected or disconnected.

11. The control method for the fluid supply system of the air suspension bearing according to claim 10, characterized in that, When the compressor (1) is started and before it reaches the stable operating state, and P3-P2<P0, the first pipeline (L1) is connected and the second pipeline (L2) is disconnected, where P0 represents the target value of the difference between the outlet pressure P1 of the refrigerant pump (5) and the motor cavity pressure P2 of the compressor (1).

12. The control method for the fluid supply system of the air suspension bearing according to claim 10, characterized in that, When the compressor (1) is in the stable operating state, If P3-P2<P0, connect the first pipeline (L1) and disconnect the second pipeline (L2); and / or If P3-P2≥P0, connect the second pipeline (L2) and disconnect the first pipeline (L1); Wherein, P0 represents the target value of the difference between the condensing pressure P3 of the condenser (2) and the motor cavity pressure P2 of the compressor (1), or the target value of the difference between the outlet pressure P1 of the refrigerant pump (5) and the motor cavity pressure P2 of the compressor (1).

13. The control method for the fluid supply system of the air suspension bearing according to claim 10, characterized in that, After the compressor (1) is turned off and before it reaches the shutdown state, the first pipeline (L1) is connected and the second pipeline (L2) is disconnected.

14. The control method for the fluid supply system of the air suspension bearing according to claim 11 or 12, characterized in that, Connecting the first pipeline (L1) includes: adjusting the speed of the refrigerant pump (5) installed on the first pipeline (L1) according to the difference between the outlet pressure P1 of the refrigerant pump (5) and the motor cavity pressure P2 of the compressor (1) until the difference reaches the target value P0.

15. The control method for the fluid supply system of the air suspension bearing according to claim 14, characterized in that, When the compressor (1) is in a stable operating state and the refrigerant pump (5) stops working due to a fault, the second pipeline (L2) is connected, the pipeline between the condenser (2) and the compressor (1) is disconnected, and the pipeline between the condenser (2) and the evaporator (4) is disconnected.

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