WO2024113892A1

WO2024113892A1 - Fault diagnosis apparatus and method based on transformer oil fluorescence multivariate calibration analysis

Info

Publication number: WO2024113892A1
Application number: PCT/CN2023/107913
Authority: WO
Inventors: 陈玉辉; 刘华; 张治平; 周宇; 钟瑞兴
Original assignee: 珠海格力电器股份有限公司
Priority date: 2022-11-30
Filing date: 2023-07-18
Publication date: 2024-06-06
Also published as: CN115929679A

Abstract

A fault diagnosis apparatus and method based on transformer oil fluorescence multivariate calibration analysis, relating to the technical field of transformer fault diagnosis, for use in solving the problems in the related art of large size and weight, high costs, and inconvenience of use of an apparatus due to directly using a fluorescence spectrometer to collect fluorescence spectra of transformer oil. According to the present application, monochromatic excitation light having an optimal excitation wavelength generated by a fluorescence excitation source is used for exciting transformer oil in a fluorescence excitation detection apparatus to generate fluorescence; the fluorescence excitation detection apparatus generates fluorescence according to the input monochromatic excitation light and inputs the fluorescence into a fluorescence signal collection and analysis apparatus; the fluorescence signal collection and analysis apparatus uses a multivariate calibration filter set to collect and analyze fluorescence signals emitted by the transformer oil, so that an emission monochromator component of a fluorescence spectrometer is replaced, and the device costs are reduced and the device size is reduced; and the data processing is rapid, so that the price-performance ratio of transformer oil fault detection is improved, and the engineering application of fluorescence monitoring technology in the aspect of transformer fault online diagnosis is realized.

Description

Hydrostatic bearing assembly, compressor and refrigerant circulation system

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is based on the Chinese patent application with application number 202211521433.2 and application date November 30, 2022, and claims its priority. The disclosed content of the Chinese patent application is hereby introduced as a whole into this application.

Technical Field

The present disclosure relates to the technical field of bearings, and in particular to a hydrostatic bearing assembly, a compressor, and a refrigerant circulation system.

Background technique

Traditional centrifugal compressors mostly use sliding bearings, which need to be lubricated with lubricating oil. The lubricating oil will enter the system, resulting in reduced energy efficiency of the centrifuge. The lubricating oil needs to be replaced regularly, which incurs a lot of expenses. At the same time, replacing the lubricating oil is easy to damage the environment and produce oil pollution. In addition, when the speed is further increased, the friction loss and temperature rise of the lubricating oil will increase rapidly, affecting the performance and reliability of the unit. Therefore, the application of oil-free bearings has received more and more attention.

There are several types of oil-free bearings:

1. Magnetic suspension bearing. It uses electromagnetic force to achieve rotor suspension without lubricating oil, but magnetic suspension requires electromagnetic bearings, high-precision sensors and bearing controllers, which are complex to control, large in size and high in cost. In addition, due to its low damping, the reliability of magnetic suspension bearings under strong disturbance conditions is poor.

2. Dynamic pressure air suspension bearing. It uses the pressure air film formed by the rotation of the air film to achieve rotor suspension, and realize oil-free and friction-free operation. However, the dynamic pressure air suspension bearing has a small bearing capacity, friction during the start-stop stage, and a short service life.

3. Static pressure air suspension bearing. It uses external high-pressure gas to form a high-pressure air film on the working surface through the throttle to support the rotor suspension, which can achieve oil-free and friction-free operation. The bearing is small in size, has a large load-bearing capacity, has no start-stop friction, and has a long service life. It has broad application prospects in centrifugal compressors.

Centrifugal compressors use hydrostatic bearings (hydrostatic air suspension bearings), which can achieve oil-free and friction-free operation of the unit. Hydrostatic bearings require high-pressure gas to work, but before the centrifugal unit is started, the system does not have high-pressure gas, so a separate air supply device is required to ensure the air supply of the hydrostatic bearing. Due to the low density of the gas, the volume of the air supply device is still very large, which leads to high costs. When the parts of the air supply system are damaged, the air supply system will release pressure quickly, which can easily cause abnormal air supply and damage to the gas bearing, and its maintenance will make the cost even higher.

In summary, the air supply device of the hydrostatic bearing in the related art is very large in size and complex in structure, resulting in high cost.

Summary of the invention

The embodiments of the present disclosure provide a hydrostatic bearing assembly, a compressor and a refrigerant circulation system to solve the problem that the air supply device of the hydrostatic bearing in the related art is very large in size and complex in structure, resulting in high cost.

To achieve the above-mentioned purpose, the present disclosure provides a hydrostatic bearing assembly, including: a bearing body, the bearing body having an outer ring surface and an inner ring surface, and a plurality of throttling holes are arranged on the bearing body; a fluid inlet for introducing external fluid is arranged on the outer ring surface, the fluid inlet is connected to the inlet of the throttling hole, and the outlet of the throttling hole is arranged on the inner ring surface; a gas pipeline, gas flows in the gas pipeline, and the gas pipeline is connected to the fluid inlet; a liquid pipeline, liquid flows in the liquid pipeline, and the liquid pipeline is connected to the fluid inlet; and a valve assembly, the valve assembly is used to control the opening and closing of the gas pipeline and the opening and closing of the liquid pipeline.

In some embodiments, the valve assembly includes: a first valve, which is arranged on the gas pipeline to control the opening and closing of the gas pipeline; and a second valve, which is arranged on the liquid pipeline to control the opening and closing of the liquid pipeline.

In some embodiments, the valve assembly includes a three-way valve, a first port of the three-way valve is connected to a gas pipeline, a second port of the three-way valve is connected to a liquid pipeline, and a third port of the three-way valve is connected to a fluid inlet; the three-way valve has a first state in which the first port is connected to the third port, and has a second state in which the second port is connected to the third port.

In some embodiments, the hydrostatic bearing assembly further includes: a liquid pump, which is disposed on the liquid pipeline and is used to pressurize the liquid and pump it to the fluid inlet.

In some embodiments, the viscosity of the gas in the gas pipeline is less than 0.01 Pa·s; the viscosity of the liquid in the liquid pipeline is less than 0.01 Pa·s.

In some embodiments, a ratio of the hole depth to the hole diameter of the throttling hole is less than or equal to 20.

In some embodiments, the throttling hole has a diameter of 0.05 mm to 0.2 mm.

In some embodiments, the bearing body is provided with a plurality of flow holes, the flow holes are arranged in one-to-one correspondence with the throttling holes, and the inlet of the throttling hole is connected with the fluid inlet through the flow holes.

In some embodiments, the hydrostatic bearing assembly is used for rotor support in a compressor, and the valve assembly is configured to close the gas pipeline and open the liquid pipeline when the compressor is turned on, so as to first provide liquid fluid to the bearing body through the liquid pipeline, and to open the gas pipeline and close the liquid pipeline after the compressor is turned on and runs for a preset period of time, so as to provide gas fluid to the bearing body through the gas pipeline.

According to another aspect of the present disclosure, a compressor is provided, comprising the above-mentioned hydrostatic bearing assembly.

In some embodiments, the compressor is a centrifugal compressor.

In some embodiments, the compressor includes a shaft that cooperates with the hydrostatic bearing assembly, and a working clearance is provided between the shaft and the inner annular surface, and the working clearance is less than 0.02 mm.

In some embodiments, a fluid channel is provided on the compressor, and a first end of the fluid channel is connected to a fluid inlet; and a gas pipeline and a liquid pipeline are connected in parallel and are connected to a second end of the fluid channel.

According to another aspect of the present disclosure, a refrigerant circulation system is provided, including a compressor, and the compressor is the above-mentioned compressor.

In some embodiments, a condenser is also included; the first end of the gas pipeline is connected to the condenser, and the second end of the gas pipeline is connected to the fluid inlet; the first end of the liquid pipeline is connected to the condenser, and the second end of the liquid pipeline is connected to the fluid inlet; the gas of the condenser enters the gas pipeline, and the liquid of the condenser enters the liquid pipeline.

The hydrostatic bearing assembly disclosed in the present invention can be fed with gas or liquid to achieve the bearing support effect. When just started, close the gas pipeline and open the liquid pipeline at the same time, and first supply fluid to the bearing body through the liquid pipeline by the liquid supply device. The volume of the liquid supply device is also very small, and the structure is relatively simple, which minimizes the cost. After a period of time after the startup, open the gas pipeline and close the liquid pipeline at the same time, and supply fluid to the bearing body through the gas pipeline by the gas supply device. Due to the low gas density, the gas supply device can continue to pressurize for a long time, and there is no need to reach the predetermined pressure in a short time. Therefore, there is no need for a large gas supply device, and the structure is simpler, which minimizes the cost. The hydrostatic bearing assembly disclosed in the present invention can switch between liquid and gas, has a simple structure, is easy to maintain, and has low maintenance costs. Therefore, compared with the hydrostatic bearings in the prior art, the hydrostatic bearing assembly disclosed in the present invention has a smaller volume, a simpler structure, and a lower cost.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which constitute a part of the specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

The present disclosure may be more clearly understood from the following detailed description with reference to the accompanying drawings, in which:

FIG1 is a perspective schematic diagram of a bearing body of a hydrostatic bearing assembly according to an embodiment of the present disclosure;

FIG2 is a cross-sectional schematic diagram of a bearing body of a hydrostatic bearing assembly according to an embodiment of the present disclosure;

FIG3 is a partial structural schematic diagram of a bearing body of a hydrostatic bearing assembly according to an embodiment of the present disclosure;

4A and 4B are system schematic diagrams of refrigerant circulation systems according to some embodiments of the present disclosure.

It should be understood that the size of each part shown in the accompanying drawings is not drawn according to the actual proportional relationship. In addition, the same or similar reference numerals represent the same or similar components.

Detailed ways

The present disclosure is further described in detail below in conjunction with the accompanying drawings and specific embodiments, but is not intended to limit the present disclosure.

Referring to FIGS. 1 to 4B , according to an embodiment of the present disclosure, a hydrostatic bearing assembly is provided, which includes a bearing body 10, the bearing body 10 having an outer annular surface 11 and an inner annular surface 12, and a plurality of throttling holes 20 are arranged on the bearing body 10; a fluid inlet 31 for introducing an external fluid is arranged on the outer annular surface 11, the fluid inlet 31 is communicated with the inlet of the throttling hole 20, and the outlet of the throttling hole 20 is arranged on the inner annular surface 12. The hydrostatic bearing assembly also includes a gas pipeline 51, a liquid pipeline 52, and a valve assembly 60, gas flows in the gas pipeline 51, and the gas pipeline 51 is communicated with the fluid inlet 31; liquid flows in the liquid pipeline 52, and the liquid pipeline 52 is communicated with the fluid inlet 31; the valve assembly 60 is used to control the opening and closing of the gas pipeline 51 and the opening and closing of the liquid pipeline 52.

The outer ring surface is usually fixed on the bearing seat or the housing of the machine to support the bearing body. The inner ring surface is usually sleeved on the shaft (usually the shaft neck), and a working gap is formed between the inner ring surface and the shaft for bearing support. The hydrostatic bearing assembly is provided with a throttle hole and a fluid inlet on the bearing body. The external high-pressure fluid flows in from the fluid inlet on the bearing body and flows out from the throttle hole, forming a high-pressure fluid film on the surface of the throttle hole outlet, that is, forming a high-pressure fluid film on the surface of the inner ring surface, thereby forming a supporting capacity to achieve the function of the bearing.

In a scenario where a hydrostatic bearing assembly is used to support a rotor (e.g., shaft 42) in a compressor, the valve assembly may be configured to close the gas pipeline 51 and open the liquid pipeline 52 when the compressor is started, so as to first provide liquid fluid to the bearing body 10 through the liquid pipeline 52, and to open the gas pipeline 51 and close the liquid pipeline 52 after the compressor has been started and run for a preset period of time, so as to provide gas fluid to the bearing body 10 through the gas pipeline 51.

The hydrostatic bearing assembly disclosed in the present invention can be fed with general gas or liquid to achieve the bearing support effect. When just started, close the gas pipeline and open the liquid pipeline at the same time, and first supply fluid to the bearing body through the liquid pipeline by the liquid supply device. The volume of the liquid supply device is also very small, and the structure is relatively simple, which minimizes the cost. After a period of time after the startup, open the gas pipeline and close the liquid pipeline at the same time, and supply fluid to the bearing body through the gas pipeline by the gas supply device. Due to the low gas density, the gas supply device can continue to pressurize for a long time, and there is no need to reach the predetermined pressure in a short time. Therefore, there is no need for a large gas supply device, and the structure is simpler, which minimizes the cost. The hydrostatic bearing assembly disclosed in the present invention can switch between liquid and gas, has a simple structure, is easy to maintain, and has low maintenance costs. Therefore, compared with the hydrostatic bearings in the prior art, the hydrostatic bearing assembly disclosed in the present invention has a smaller volume, a simpler structure, and a lower cost.

The gas pipeline and the liquid pipeline can correspond to a gas supply device and a liquid supply device respectively. Through the coordination of the gas pipeline, the liquid pipeline and the hydrostatic bearing, the hydrostatic bearing can work as a separate liquid hydrostatic bearing or a separate gas hydrostatic bearing, and can also switch between liquid and gas. It can be selected according to the situation, because the two fluid media can be alternated, the requirements for the gas supply device and the liquid supply device are lower, the volume is smaller, and the cost can be reduced.

Referring to FIG. 4A , in some embodiments, the valve assembly 60 includes a first valve 61 and a second valve 62, wherein the first valve 61 is disposed on the gas pipeline 51 to control the opening and closing of the gas pipeline 51; and the second valve 62 is disposed on the liquid pipeline 52 to control the opening and closing of the liquid pipeline 52. In FIG. 4B , the valve assembly 60 may include a three-way valve 63, wherein a first port of the three-way valve 63 is connected to the gas pipeline 51, a second port of the three-way valve 63 is connected to the liquid pipeline 52, and a third port of the three-way valve 63 is connected to the fluid inlet 31; the three-way valve 63 has a first state in which the first port is connected to the third port, and has a second state in which the second port is connected to the third port. The three-way valve 63 can control the opening and closing of the gas pipeline and the liquid pipeline.

In some embodiments, the hydrostatic bearing assembly further includes a liquid pump 70, which is disposed on the liquid pipeline 52 and is used to pressurize the liquid and pump it to the fluid inlet 31. The liquid pump 70 can compensate for the problem of insufficient liquid pressure in the liquid supply device and ensure the fluid pressure of the hydrostatic bearing.

In order to further optimize the stability and reliability of the hydrostatic bearing assembly, in some embodiments, the viscosity of the gas in the gas pipeline 51 is less than 0.01 Pa·s; the viscosity of the liquid in the liquid pipeline 52 is less than 0.01 Pa·s. When the viscosity of the fluid is too high, it is easy to cause blockage, resulting in the bearing not being able to work properly, so a low-viscosity fluid is used to ensure that the hydrostatic bearing can operate stably.

Referring to FIG3 , the ratio of the hole depth h to the hole diameter d of the throttle hole 20 may be less than or equal to 20. If the ratio is greater than 20, the cost of machining the throttle hole increases and the quality decreases. Therefore, the above improvement can reduce the machining cost and the bearing quality is more stable.

In some embodiments, the aperture d of the throttle hole 20 is between 0.05 mm and 0.2 mm. The supporting capacity of the high-pressure fluid film is closely related to the size of the throttle hole, and the aperture d of the throttle hole is between 0.05 mm and 0.2 mm. When the aperture of the throttle hole is less than 0.05 mm, the carrying capacity of the fluid after passing through the throttle hole is greatly reduced, and the processing difficulty of the hole increases. When the aperture is greater than 0.2 mm, the stability of the fluid film will deteriorate, reducing the reliability of the bearing.

Referring to FIG. 1 and FIG. 2 , in some embodiments, the number of fluid inlets 31 is multiple, and the fluid inlets 31 are arranged one-to-one with the throttle holes 20. The bearing body 10 is provided with multiple flow holes 32, and the flow holes 32 are arranged one-to-one with the throttle holes 20. The inlet of the throttle hole 20 is connected to the fluid inlet 31 through the above-mentioned flow holes 32. The arrangement of the throttle holes 20 is uniformly distributed according to the annular surface of the bearing body, and the distribution method can be selected according to the load-bearing capacity. select.

3, further, the corresponding throttle hole 20, fluid inlet 31 and flow hole 32 can be coaxial. This structure makes the bearing body easier to process and the production cost is also lower.

According to an embodiment of the present disclosure, a compressor is provided. The compressor includes the hydrostatic bearing assembly of the above embodiment.

The compressor of this embodiment is a centrifugal compressor. The refrigeration centrifugal compressor adopts a hydrostatic bearing, which can realize oil-free and friction-free operation of the unit. The air supply system or liquid supply system of the compressor is smaller in size, lower in cost, and more stable in operation.

As shown in FIG3 , the compressor includes a shaft 42 that cooperates with the hydrostatic bearing assembly, and a working clearance S is provided between the shaft 42 and the inner ring surface 12 of the hydrostatic bearing assembly, and the working clearance S is less than 0.02 mm. The working clearance S is less than 0.02 mm to ensure the bearing stiffness. An excessively large clearance will cause the bearing stiffness to decrease rapidly, thereby affecting the bearing support performance.

The compressor is provided with a fluid channel 41, a first end of which is connected to the fluid inlet 31 of the hydrostatic bearing; a gas pipeline 51 and a liquid pipeline 52 are connected in parallel and are connected to the second end of the fluid channel 41. The fluid channel 41 is a structure provided to cooperate with the hydrostatic bearing assembly.

4A and 4B , according to an embodiment of the present disclosure, a refrigerant circulation system is provided, including a compressor 40 , wherein the compressor 40 includes the compressor of the above embodiment, and a bearing body 10 of a static pressure bearing is installed on a supporting structure inside the compressor.

The gas pipeline and the liquid pipeline can correspond to a gas supply device and a liquid supply device respectively. Through the coordination of the gas pipeline, the liquid pipeline and the hydrostatic bearing, the hydrostatic bearing can work as a separate liquid hydrostatic bearing or a separate gas hydrostatic bearing, and can also switch between liquid and gas. It can be selected and used according to the situation, because the two fluid media can be alternated, the requirements for the gas supply device and the liquid supply device are lower, the volume of the liquid supply device is smaller, the structure of the gas supply device and the liquid supply device is simple, and the maintenance cost is very low, so that the cost can be reduced.

In some embodiments, the refrigerant circulation system further includes a liquid pump 70, which is disposed on the liquid pipeline 52 and is used to pressurize the liquid and pump it to the fluid inlet 31. The liquid pump 70 can compensate for the problem of insufficient liquid pressure in the liquid supply device and ensure the fluid pressure of the hydrostatic bearing.

In the refrigerant circulation system, a fluid channel 41 is provided on the compressor 40, and a first end of the fluid channel 41 is connected to the fluid inlet 31 of the hydrostatic bearing; a gas pipeline 51 and a liquid pipeline 52 are connected in parallel and are connected to a second end of the fluid channel 41. The fluid channel 41 is a structure provided to cooperate with the hydrostatic bearing assembly.

In order to further optimize the stability and reliability of the hydrostatic bearing assembly, in this embodiment, the gas pipeline 51 The viscosity of the gas is less than 0.01 Pa·s; the viscosity of the liquid in the liquid pipeline 52 is less than 0.01 Pa·s. When the viscosity of the fluid is too high, it is easy to cause blockage, resulting in the bearing not being able to work normally. Therefore, a low-viscosity fluid is used to ensure that the hydrostatic bearing can operate stably.

This embodiment is to minimize the volume of the gas supply device or the liquid supply device and maximize the use of the various structures of the refrigerant circulation system. In this embodiment, the refrigerant circulation system also includes a condenser 80; the first end of the gas pipeline 51 is connected to the condenser 80, and the second end of the gas pipeline 51 is connected to the fluid inlet 31 of the static pressure bearing; the first end of the liquid pipeline 52 is connected to the condenser 80, and the second end of the liquid pipeline 52 is connected to the fluid inlet 31 of the static pressure bearing; the gas of the condenser 80 enters the gas pipeline 51, and the liquid of the condenser 80 enters the liquid pipeline 52. The connection position of the first end of the gas pipeline 51 (the upper part of the condenser) allows the gas pipeline to receive the condenser gas part 80a, and the connection position of the first end of the liquid pipeline 52 (the bottom of the condenser) allows the liquid pipeline to receive the condenser liquid part 80b.

Before the refrigerant circulation system is turned on, the pressure at each position of the system is the same, and the gas cannot flow freely. The liquid pipeline 52 is opened through the second valve 62, and the gas pipeline 51 is closed at the same time; after the liquid pump pressurizes the liquid at the bottom of the condenser, the liquid is provided to the hydrostatic bearing inside the compressor to support the operation of the rotor. After the compressor is running, the system pressure increases, and the condenser pressure is higher than that inside the compressor and the evaporator. When the pressure difference between the condenser pressure and the internal pressure of the compressor reaches the working condition of the hydrostatic bearing, the gas pipeline 51 is opened through the first valve 61, and the liquid pipeline 52 is closed. The high-pressure liquid in the condenser enters the hydrostatic bearing inside the compressor to support the operation of the rotor in the compressor.

The centrifugal compressor of the refrigerant circulation system uses hydrostatic bearings, which can realize oil-free and friction-free operation of the unit. Before the refrigerant circulation system is turned on, the pressure in all parts of the system is the same, and there is no high-pressure fluid required by the bearings, so it is necessary to add a fluid pressurizing device. At this time, using liquid as the working medium can reduce the size and cost of the pressurizing device. When the refrigerant circulation system is working normally, the system has both high-pressure liquid and high-pressure gas. At this time, the high-pressure fluid of the refrigerant circulation system can be used to work, and the fluid pressurizing device can be turned off to improve the system efficiency and the life of the fluid pressurizing device.

It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and/or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and/or combinations thereof.

It should be noted that the terms "first", "second", etc. in the specification and claims of the present application 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 numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

Of course, the above are preferred embodiments of the present disclosure. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the basic principles of the present disclosure, and these improvements and modifications are also considered to be within the protection scope of the present disclosure.

Claims

A hydrostatic bearing assembly, comprising:

A bearing body (10), the bearing body (10) comprising an outer annular surface (11) and an inner annular surface (12), the bearing body (10) being provided with a plurality of throttling holes (20); a fluid inlet (31) for introducing an external fluid is provided on the outer annular surface (11), the fluid inlet (31) being communicated with an inlet of the throttling hole (20), and an outlet of the throttling hole (20) being provided on the inner annular surface (12);

a gas pipeline (51), wherein gas flows in the gas pipeline (51), and the gas pipeline (51) is in communication with the fluid inlet (31);

a liquid pipeline (52), wherein liquid flows in the liquid pipeline (52), and the liquid pipeline (52) is connected to the fluid inlet (31); and

A valve assembly (60) is used to control the opening and closing of the gas pipeline (51) and the opening and closing of the liquid pipeline (52).
The hydrostatic bearing assembly of claim 1, wherein the valve assembly (60) comprises:

a first valve (61), arranged on the gas pipeline (51) to control the opening and closing of the gas pipeline (51); and

A second valve (62) is provided on the liquid pipeline (52) to control the opening and closing of the liquid pipeline (52).
The hydrostatic bearing assembly according to claim 1, wherein the valve assembly (60) comprises a three-way valve (63), a first port of the three-way valve (63) is in communication with the gas pipeline (51), a second port of the three-way valve (63) is in communication with the liquid pipeline (52), and a third port of the three-way valve (63) is in communication with the fluid inlet (31);

The three-way valve (63) has a first state in which the first port is connected to the third port, and has a second state in which the second port is connected to the third port.
The hydrostatic bearing assembly according to any one of claims 1 to 3, further comprising:

A liquid pump (70), wherein the liquid pump (70) is disposed on the liquid pipeline (52), and the liquid pump (70) is used to pressurize the liquid and pump the liquid to the fluid inlet (31).
The hydrostatic bearing assembly according to any one of claims 1 to 4, wherein

The viscosity of the gas in the gas pipeline (51) is less than 0.01 Pa·s;

The viscosity of the liquid in the liquid pipeline (52) is less than 0.01 Pa·s.
The hydrostatic bearing assembly according to any one of claims 1 to 5, wherein

The ratio of the hole depth (h) to the hole diameter (d) of the throttling hole (20) is less than or equal to 20.
The hydrostatic bearing assembly according to any one of claims 1 to 6, wherein the diameter (d) of the throttle hole (20) is 0.05 mm to 0.2 mm.
According to any one of claims 1 to 7, the hydrostatic bearing assembly is provided with a plurality of flow holes (32), the flow holes (32) are arranged in one-to-one correspondence with the throttling holes (20), and the inlet of the throttling hole (20) is connected to the fluid inlet (31) through the flow hole (32).
According to any one of claims 1 to 8, the hydrostatic bearing assembly is used for supporting a rotor in a compressor, and the valve assembly is configured to close the gas pipeline (51) and open the liquid pipeline (52) when the compressor is turned on, so as to first provide liquid fluid to the bearing body (10) through the liquid pipeline (52), and to open the gas pipeline (51) and close the liquid pipeline (52) after the compressor is turned on and runs for a preset time, so as to provide gas fluid to the bearing body (10) through the gas pipeline (51).
A compressor comprises the hydrostatic bearing assembly according to any one of claims 1 to 9.
The compressor of claim 10, wherein the compressor is a centrifugal compressor.
A compressor according to claim 10 or 11, wherein the compressor comprises a shaft (42) cooperating with the hydrostatic bearing assembly, a working gap (S) being provided between the shaft (42) and the inner annular surface (12), and the working gap (S) being less than 0.02 mm.
The compressor according to any one of claims 10 to 12, wherein a fluid channel (41) is provided on the compressor, and a first end of the fluid channel (41) is connected to the fluid inlet (31);

The gas pipeline (51) and the liquid pipeline (52) are connected in parallel and communicate with the second end of the fluid channel (41).
A refrigerant circulation system comprises a compressor (40), wherein the compressor (40) is the compressor according to any one of claims 10 to 13.
The refrigerant circulation system according to claim 14, further comprising a condenser (80);

The first end of the gas pipeline (51) is in communication with the condenser (80), and the second end of the gas pipeline (51) is in communication with the fluid inlet (31);

The first end of the liquid pipeline (52) is in communication with the condenser (80), and the second end of the liquid pipeline (52) is in communication with the fluid inlet (31);

The gas of the condenser (80) enters the gas pipeline (51), and the liquid of the condenser (80) enters the liquid pipeline (52).