CN219101682U

CN219101682U - Hydrostatic bearing assembly, compressor and refrigerant circulation system

Info

Publication number: CN219101682U
Application number: CN202223233961.6U
Authority: CN
Inventors: 陈玉辉; 刘华; 张治平; 周宇; 钟瑞兴
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2022-11-30
Filing date: 2022-11-30
Publication date: 2023-05-30
Anticipated expiration: 2032-11-30

Abstract

The utility model discloses a hydrostatic bearing assembly, a compressor and a refrigerant circulation system, wherein the hydrostatic bearing assembly comprises: the bearing body is provided with an outer ring surface and an inner ring surface, and a plurality of throttling holes are formed in the bearing body; the outer annular surface is provided with a fluid inlet for introducing external fluid, the fluid inlet is communicated with the inlet of the orifice, and the outlet of the orifice is arranged on the inner annular surface; the gas pipeline circulates gas in the gas pipeline and is communicated with the fluid inlet; a liquid pipeline, wherein liquid flows in the liquid pipeline, and the liquid pipeline is communicated with the fluid inlet; and the valve component is used for controlling the opening and closing of the gas pipeline and the opening and closing of the liquid pipeline. The hydrostatic bearing assembly, the compressor and the refrigerant circulation system have the advantages of simple structure and low cost.

Description

Hydrostatic bearing assembly, compressor and refrigerant circulation system

Technical Field

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

Background

The traditional centrifugal compressor mostly adopts sliding bearings, and the bearings are required to be lubricated by adopting lubricating oil, so that the lubricating oil can enter the system, and the centrifugal energy efficiency is reduced. Meanwhile, the lubricating oil needs to be replaced regularly, so that more cost is generated, and meanwhile, the existing environment is easily damaged and oil stains are generated when the lubricating oil is replaced. In addition, when the rotating speed is further increased, friction loss and temperature rise of the lubricating oil are rapidly increased, and the performance and reliability of the unit are affected. Therefore, the use of oilless bearings is becoming more and more important. The oilless bearing has the following components:

the magnetic suspension bearing realizes rotor suspension through electromagnetic force without lubricating oil, but the magnetic suspension requires an electromagnetic bearing, a high-precision sensor and a bearing controller, and has complex control, large volume and high cost. In addition, the magnetic suspension bearing has low reliability under the strong disturbance working condition due to small damping.

The dynamic pressure air suspension bearing realizes rotor suspension by utilizing a pressure air film formed by air film rotation, oil-free and friction-free operation is realized, but the dynamic pressure air suspension bearing has small bearing capacity, friction in start-stop stages and short service life.

The static pressure gas suspension bearing utilizes external high-pressure gas to form a high-pressure gas film on the working surface through the restrictor to support the rotor to suspend, and can realize oil-free and friction-free operation. The bearing has small volume, large bearing capacity, no start-stop friction, long service life and wide application prospect in the centrifugal compressor.

The centrifugal compressor adopts a hydrostatic bearing (hydrostatic gas suspension bearing), oil-free and friction-free operation of the unit can be realized, high-pressure gas is needed when the hydrostatic bearing works, but the system does not have high-pressure gas before the centrifugal unit is started, so that a set of independent gas supply device is needed to ensure gas supply of the hydrostatic bearing. The volume of the gas supply is also very large due to the low gas density, which results in high costs. When the parts of the gas supply system are damaged, the pressure of the gas supply system is quickly released, the gas bearing is easy to damage due to abnormal gas supply, and the cost caused by maintenance is higher.

In summary, the air supply device of the hydrostatic bearing in the prior art has very large volume, complex structure and high cost.

Disclosure of Invention

The embodiment of the utility model provides a hydrostatic bearing assembly, a compressor and a refrigerant circulating system, which are used for solving the problems of high cost caused by the fact that a gas supply device of the hydrostatic bearing in the prior art is very large in size and complex in structure.

To achieve the above object, the present utility model provides a hydrostatic bearing assembly comprising: the bearing body is provided with an outer ring surface and an inner ring surface, and a plurality of throttling holes are formed in the bearing body; the outer annular surface is provided with a fluid inlet for introducing external fluid, the fluid inlet is communicated with the inlet of the orifice, and the outlet of the orifice is arranged on the inner annular surface; the gas pipeline circulates gas in the gas pipeline and is communicated with the fluid inlet; a liquid pipeline, wherein liquid flows in the liquid pipeline, and the liquid pipeline is communicated with the fluid inlet; and the valve component is used for controlling the opening and closing of the gas pipeline and the opening and closing of the liquid pipeline.

Further, the valve assembly includes: the first valve is arranged on the gas pipeline to control the opening and closing of the gas pipeline; the second valve is arranged on the liquid pipeline to control the opening and closing of the liquid pipeline.

Further, the valve assembly comprises a three-way valve, a first port of the three-way valve is communicated with the gas pipeline, a second port of the three-way valve is communicated with the liquid pipeline, and a third port of the three-way valve is communicated with the fluid inlet; the three-way valve has a first state communicating the first port with the third port, and the three-way valve has a second state communicating the second port with the third port.

Further, the method further comprises the following steps: and the liquid pump is arranged on the liquid pipeline and is used for pressurizing liquid and pumping the liquid to the fluid inlet.

Further, 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.

Further, the orifice has a ratio of the depth of the orifice to the diameter of the orifice of less than or equal to 20.

According to another aspect of the present utility model, there is provided a compressor comprising the hydrostatic bearing assembly described above.

Further, the compressor is a centrifugal compressor.

Further, the compressor includes a shaft that mates with the hydrostatic bearing assembly, with a working gap between the shaft and the inner annular surface that is less than 0.02mm.

Further, a fluid channel is arranged on the compressor, and the first end of the fluid channel is communicated with the fluid inlet; the gas pipeline and the liquid pipeline are connected in parallel and then communicated with the second end of the fluid channel.

According to another aspect of the present utility model, there is provided a refrigerant circulation system including a compressor, the compressor being the above-mentioned compressor.

Further, the device also comprises a condenser; the first end of the gas pipeline is communicated with the condenser, and the second end of the gas pipeline is communicated with the fluid inlet; the first end of the liquid pipeline is communicated with the condenser, and the second end of the liquid pipeline is communicated with 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 of the present utility model may be vented with a common gas or liquid to achieve bearing support. When the engine is started, the gas pipeline is closed, the liquid pipeline is opened, fluid is supplied to the bearing body through the liquid pipeline by the liquid supply device, the volume of the liquid supply device is very small, the structure is relatively simple, and the cost is reduced to the greatest extent. After one end of the starting-up operation is finished, the gas pipeline is opened, the liquid pipeline is closed at the same time, fluid is supplied to the bearing body through the gas pipeline by the gas supply device, and the gas density is low, so that the gas supply device can continuously pressurize in a long time without reaching the preset pressure in a short time, the large gas supply device is not needed, the structure is simpler, and the cost is reduced to the maximum. The hydrostatic bearing assembly can be switched between liquid and gas, and has the advantages of simple structure, convenient maintenance and low maintenance cost. Therefore, compared with the hydrostatic bearing in the prior art, the hydrostatic bearing assembly has smaller volume, simple structure and lower cost.

Drawings

FIG. 1 is a schematic perspective view of a bearing body of a hydrostatic bearing assembly of an embodiment of the present utility model;

FIG. 2 is a schematic cross-sectional view of a bearing body of a hydrostatic bearing assembly of an embodiment of the utility model;

FIG. 3 is a schematic view of a portion of a bearing body of a hydrostatic bearing assembly of an embodiment of the present utility model;

fig. 4 is a schematic system diagram of a refrigerant circulation system according to an embodiment of the utility model.

Detailed Description

The utility model will now be described in further detail with reference to the drawings and specific examples, which are not intended to limit the utility model thereto.

Referring to fig. 1 to 4, according to an embodiment of the present utility model, there is provided a hydrostatic bearing assembly including a bearing body 10, the bearing body 10 having an outer annular surface 11 and an inner annular surface 12, the bearing body 10 being provided with a plurality of orifices 20; the outer annulus 11 is provided with a fluid inlet 31 for introducing an external fluid, the fluid inlet 31 communicating with the inlet of the orifice 20, the outlet of the orifice 20 being provided on the inner annulus 12. The hydrostatic bearing assembly further comprises a gas pipeline 51, a liquid pipeline 52 and a valve assembly, wherein gas circulates in the gas pipeline 51, and the gas pipeline 51 is communicated with the fluid inlet 31; the liquid pipeline 52 is communicated with liquid, and the liquid pipeline 52 is communicated with the fluid inlet 31; the valve assembly is used for controlling 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 to a bearing housing or housing of the machine and serves to support the bearing body. The inner annulus is typically journaled on a shaft (typically a journal) with a working gap formed between the inner annulus and the shaft for bearing support. The hydrostatic bearing assembly is provided with an orifice and a fluid inlet on the bearing body, external high-pressure fluid flows in from the fluid inlet on the bearing body and flows out from the orifice, and a high-pressure fluid film is formed on the surface of the orifice outlet, namely, a high-pressure fluid film is formed on the surface of an inner ring surface, so that the supporting capacity is formed, and the bearing effect is achieved.

The gas pipeline and the liquid pipeline can respectively correspond to a gas supply device and a liquid supply device, and through the cooperation of the gas pipeline, the liquid pipeline and the hydrostatic bearing, the hydrostatic bearing can be used as an independent hydrostatic bearing or an independent hydrostatic bearing, and meanwhile, the hydrostatic bearing can be switched between liquid and gas. The two fluid media can be used alternatively according to the situation, and the requirements on the air supply device and the liquid supply device are lower, the volume is smaller, and the cost can be reduced.

In the present embodiment, the valve assembly includes a first valve 61 and a second valve 62, the first valve 61 being provided on the gas line 51 to control opening and closing of the gas line 51; a second valve 62 is provided on the liquid line 52 to control opening and closing of the liquid line 52. In an embodiment not shown in the figures, the valve assembly comprises a three-way valve, a first port of which communicates with the gas line 51, a second port of which communicates with the liquid line 52, and a third port of which communicates with the fluid inlet 31; the three-way valve has a first state communicating the first port with the third port, and the three-way valve has a second state communicating the second port with the third port. The three-way valve can control the opening and closing of the gas pipeline and the liquid pipeline.

Preferably, the hydrostatic bearing assembly further comprises a liquid pump 70, the liquid pump 70 being disposed on the liquid line 52, the liquid pump 70 being adapted to pump the liquid after pressurization to the fluid inlet 31. The liquid pump 70 can compensate the problem of insufficient liquid pressure in the liquid supply device, and ensure the fluid pressure of the hydrostatic bearing.

To further optimize the stability and reliability of the hydrostatic bearing assembly, in this embodiment, the viscosity of the gas in gas line 51 is less than 0.01 Pa-s; the viscosity of the liquid in the liquid line 52 is less than 0.01pa·s. When the viscosity of the fluid is too high, the fluid is easy to cause blockage, so that the bearing cannot work normally, and the hydrostatic bearing can operate stably by adopting the low-viscosity fluid.

Referring to fig. 3, the ratio of the hole depth h to the hole diameter d of the orifice 20 is less than or equal to 20. If the above ratio is greater than 20, the cost of the orifice processing increases and the quality decreases. Therefore, the improvement can reduce the processing cost and the bearing quality is more stable.

Preferably, the orifice 20 has a diameter d between 0.05mm and 0.2 mm. The high-pressure fluid membrane supporting capacity is closely related to the size of the orifice, and the size d of the orifice is between 0.05mm and 0.2 mm. When the aperture of the orifice is smaller than 0.05mm, the bearing capacity of the fluid passing through the orifice is greatly reduced, and the processing difficulty of the orifice is increased. When the pore diameter is more than 0.2mm, the stability of the fluid film may be deteriorated, reducing the bearing reliability.

The number of the fluid inlets 31 is plural, and the fluid inlets 31 are provided in one-to-one correspondence with the orifices 20. The bearing body 10 is provided with a plurality of flow-through holes 32, the flow-through holes 32 are arranged in one-to-one correspondence with the throttle holes 20, and the inlet of the throttle hole 20 communicates with the fluid inlet 31 through the flow-through holes 32. The orifices 20 are arranged in a uniform distribution according to the annular surface of the bearing body, and the distribution can be selected according to the bearing capacity.

In this embodiment, the orifice 20, the fluid inlet 31, and the flow-through aperture 32 are coaxial. The structure makes the processing difficulty of the bearing body lower and the production cost lower.

According to an embodiment of the present utility model, there is provided a compressor including the hydrostatic bearing assembly of the above embodiment.

The compressor of this embodiment is a centrifugal compressor. The refrigerating centrifugal compressor adopts a hydrostatic bearing, so that the unit can run without oil and friction. The air supply system or the liquid supply system of the compressor is smaller in size, lower in cost and more stable in operation.

Referring to fig. 3, the compressor includes a shaft fitted with a hydrostatic bearing assembly, and a working gap S is provided between the shaft and an inner annular surface 12 of the hydrostatic bearing assembly, wherein the working gap S is smaller than 0.02mm. The working gap S is smaller than 0.02mm to ensure the rigidity of the bearing, and the bearing rigidity is rapidly reduced due to the excessive gap, so that the bearing supporting performance is affected.

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

Referring to fig. 4, according to an embodiment of the present utility model, there is provided a refrigerant circulation system including a compressor 40, the compressor 40 including the compressor of the above embodiment, and a bearing body 10 of a hydrostatic bearing mounted on a support structure inside the compressor.

The gas pipeline and the liquid pipeline can respectively correspond to a gas supply device and a liquid supply device, and through the cooperation of the gas pipeline, the liquid pipeline and the hydrostatic bearing, the hydrostatic bearing can be used as an independent hydrostatic bearing or an independent hydrostatic bearing, and meanwhile, the hydrostatic bearing can be switched between liquid and gas. The two fluid media can be used alternatively according to the conditions, the requirements on the air supply device and the liquid supply device are lower, the volume of the liquid supply device is smaller, the air supply device and the liquid supply device are simple in structure and low in maintenance cost, and the cost can be reduced.

Preferably, the refrigerant circulation system further comprises a liquid pump 70, wherein the liquid pump 70 is disposed on the liquid pipeline 52, and the liquid pump 70 is used for pressurizing the liquid and pumping the liquid to the fluid inlet 31. The liquid pump 70 can compensate 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 arranged on the compressor 40, and a first end of the fluid channel 41 is communicated with a fluid inlet 31 of the hydrostatic bearing; the gas line 51 and the liquid line 52 are connected in parallel and communicate with the second end of the fluid channel 41. The fluid passage 41 is a structure provided to cooperate with the hydrostatic bearing assembly.

In this embodiment, in order to maximally reduce the volume of the air supply device or the liquid supply device and maximize the utilization of various structures of the refrigerant circulation system. In this embodiment, the refrigerant circulation system further includes a condenser 80; a first end of the gas line 51 communicates with the condenser 80 and a second end of the gas line 51 communicates with the fluid inlet 31 of the hydrostatic bearing; a first end of the liquid line 52 communicates with the condenser 80 and a second end of the liquid line 52 communicates with the fluid inlet 31 of the hydrostatic bearing; the gas from condenser 80 enters gas line 51 and the liquid from condenser 80 enters liquid line 52. The first end of the gas line 51 is connected in a position (condenser upper portion) such that the gas line receives the condenser gas portion 80a and the first end of the liquid line 52 is connected in a position (condenser bottom portion) such that the liquid line receives the condenser liquid portion 80b.

Before the refrigerant circulation system is started, the pressure of each position of the system is the same, and at the moment, gas cannot flow freely. The liquid line 52 is opened by the second valve 62 while the gas line 51 is closed; after pressurizing the liquid at the bottom of the condenser, the liquid pump supplies the liquid to the hydrostatic bearings inside the compressor to support the rotor operation. After the compressor is operated, the system pressure is increased, the condenser pressure is higher than the pressure inside the compressor and the evaporator, when the pressure difference between the condenser pressure and the pressure inside the compressor reaches the working condition of the hydrostatic bearing, the gas pipeline 51 is opened through the first valve 61, the liquid pipeline 52 is closed, and the high-pressure liquid of the condenser enters the hydrostatic bearing inside the compressor to support the rotor inside the compressor to operate.

The centrifugal compressor of the refrigerant circulation system adopts a hydrostatic bearing, so that the oilless and frictionless operation of the unit can be realized. Before the refrigerant circulation system is started, the pressure of the system is the same, and high-pressure fluid needed by a bearing is not needed, so that a fluid pressurizing device is needed to be added, at the moment, liquid is used as a working medium, the volume and cost of the pressurizing device can be reduced, and when the refrigerant circulation system normally works, the system has high-pressure liquid and high-pressure gas, at the moment, the high-pressure fluid of the refrigerant circulation system can be used for working, the fluid pressurizing device is closed, the system efficiency is improved, and the service life of the fluid pressurizing device is prolonged.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be implemented in sequences other than those illustrated or described herein.

Of course, the above is a preferred embodiment of the present utility model. It should be noted that it will be apparent to those skilled in the art that several modifications and adaptations can be made without departing from the general principles of the present utility model, and such modifications and adaptations are intended to be comprehended within the scope of the present utility model.

Claims

1. A hydrostatic bearing assembly, comprising:

the bearing comprises a bearing body (10), wherein the bearing body (10) is provided with an outer annular surface (11) and an inner annular surface (12), and a plurality of orifices (20) are arranged on the bearing body (10); the outer annular surface (11) is provided with a fluid inlet (31) for introducing external fluid, the fluid inlet (31) is communicated with the inlet of the throttle hole (20), and the outlet of the throttle hole (20) is arranged on the inner annular surface (12);

a gas line (51) through which a gas flows in the gas line (51), the gas line (51) being in communication with the fluid inlet (31);

-a liquid conduit (52), the liquid conduit (52) being in fluid communication with the fluid inlet (31);

and the valve assembly is used for controlling the opening and closing of the gas pipeline (51) and the opening and closing of the liquid pipeline (52).

2. The hydrostatic bearing assembly of claim 1, wherein the valve assembly comprises:

a first valve (61) provided on the gas line (51) to control opening and closing of the gas line (51);

and a second valve (62) provided on the liquid line (52) to control the opening and closing of the liquid line (52).

3. The hydrostatic bearing assembly of claim 1, wherein the valve assembly comprises a three-way valve, a first port of the three-way valve being in communication with the gas line (51), a second port of the three-way valve being in communication with the liquid line (52), a third port of the three-way valve being in communication with the fluid inlet (31);

the three-way valve has a first state communicating the first port with the third port, and the three-way valve has a second state communicating the second port with the third port.

4. The hydrostatic bearing assembly of claim 1, further comprising:

-a liquid pump (70), said liquid pump (70) being arranged on said liquid line (52), said liquid pump (70) being arranged to pump liquid after pressurization to said fluid inlet (31).

5. The hydrostatic bearing assembly of claim 1, wherein the hydrostatic bearing assembly comprises,

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 line (52) is less than 0.01 Pa.s.

6. The hydrostatic bearing assembly of claim 1, wherein the hydrostatic bearing assembly comprises,

the ratio of the hole depth (h) to the hole diameter (d) of the throttle hole (20) is less than or equal to 20.

7. A compressor comprising the hydrostatic bearing assembly of any one of claims 1 to 6.

8. The compressor of claim 7, wherein the compressor is a centrifugal compressor.

9. Compressor according to claim 7, characterized in that it comprises a shaft cooperating with the hydrostatic bearing assembly, said shaft having a working gap (S) with the inner annular surface (12), said working gap (S) being less than 0.02mm.

10. Compressor according to claim 7, wherein a fluid channel (41) is provided on the compressor, a first end of the fluid channel (41) being in communication with the fluid inlet (31);

the gas line (51) and the liquid line (52) are connected in parallel and then communicate with the second end of the fluid channel (41).

11. A refrigerant circulation system comprising a compressor (40), characterized in that the compressor (40) is a compressor according to any one of claims 7 to 10.

12. The refrigerant circulation system according to claim 11, further comprising a condenser (80);

-a first end of the gas line (51) communicates with the condenser (80), and a second end of the gas line (51) communicates with the fluid inlet (31);

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

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