CN113090573A

CN113090573A - Radial dynamic pressure gas bearing, compressor and air conditioning unit

Info

Publication number: CN113090573A
Application number: CN202010022422.4A
Authority: CN
Inventors: 卓明胜; 张治平; 刘华; 李宏波; 陈玉辉; 钟瑞兴
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2020-01-09
Filing date: 2020-01-09
Publication date: 2021-07-09

Abstract

The invention relates to a radial dynamic pressure gas bearing, a compressor and an air conditioning unit, wherein the radial dynamic pressure gas bearing comprises a bearing shell (10), a wave foil (20) and a top foil (30), the wave foil (20) is arranged between the bearing shell (10) and the top foil (30), a cavity (40) is formed between the inner wall of the bearing shell (10) and the wave foil (20), and the bearing shell (10) is provided with a ventilation channel which is used for introducing gas into the cavity (40). The compressor includes a radial dynamic pressure gas bearing. The air conditioning unit includes a compressor. According to the invention, through the ventilation channel arranged on the bearing shell, gas can be introduced into the cavity between the inner wall of the bearing shell and the wave foil, and the rigidity of the wave foil can be adjusted through the introduced gas, so that the bearing can better adapt to the vibration of the rotor, and the stability of a compressor applying the bearing in the operation process is improved.

Description

Radial dynamic pressure gas bearing, compressor and air conditioning unit

Technical Field

The invention relates to the technical field of compressors, in particular to a radial dynamic pressure gas bearing, a compressor and an air conditioning unit.

Background

The wave foil pneumatic suspension centrifugal compressor supports the rotor to suspend by utilizing the force generated by the dynamic pressure effect of the gas bearing in the high-speed rotation process, the compressor can realize oil-free and friction-free operation, the bearing does not have mechanical power consumption, a complex oil circuit system can be omitted, the friction between lubricating oil and a high-speed shaft is also avoided, the friction loss is reduced, and the compressor is simple in structure, high in efficiency and simple and convenient to maintain.

However, in practical use, the dynamic pressure air suspension compressor is subjected to complex stress during starting and running processes, unstable vibration of the rotor is easily caused, the rigidity of the bearing cannot adapt to the vibration of the rotor, and the rotor still rubs against the bearing at certain stages, so that the service lives of the rotor and the bearing are influenced.

It is noted that the information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information constitutes prior art already known to a person skilled in the art.

Disclosure of Invention

The invention aims to provide a radial dynamic pressure gas bearing, a compressor and an air conditioning unit so as to improve the adaptability of the bearing to rotor vibration.

To achieve the above object, the present invention provides a radial dynamic pressure gas bearing comprising:

a bearing housing;

a top foil; and

the bump foil is arranged between the bearing shell and the top foil, a cavity is formed between the inner wall of the bearing shell and the bump foil, and the bearing shell is provided with a ventilation channel which is used for introducing gas into the cavity.

In some embodiments, the vent passage comprises a vent hole that extends radially through the bearing housing.

In some embodiments, the vent passage comprises a plurality of vent holes arranged in an axial and/or circumferential direction of the bearing housing.

In some embodiments, the bump foil includes a first wave band in contact with the inner wall of the bearing housing and a second wave band that is convex away from the inner wall of the bearing housing to form a cavity between the second wave band and the inner wall of the bearing housing, the vent hole being in communication with the cavity.

In some embodiments, the vent is disposed in a middle portion of a portion of the bearing housing corresponding to the second band.

In some embodiments, the vent passage includes a vent groove extending in an axial direction of the bearing housing, the vent hole communicating with the vent groove.

In some embodiments, the vent slot is provided on a side of the bearing housing remote from the bump foil.

In some embodiments, the cavity is in communication with a space between the bump foil and the top foil.

In order to achieve the above object, the present invention further provides a compressor including the above radial dynamic pressure gas bearing.

In some embodiments, a delivery passage is provided in the compressor, the delivery passage is communicated with the ventilation passage for delivering gas to the ventilation passage, and the delivery passage is provided with a regulating valve.

In order to achieve the purpose, the invention further provides an air conditioning unit which comprises the compressor.

In some embodiments, the air conditioning unit further includes a refrigerant delivery pipe, and the refrigerant delivery pipe is communicated with the ventilation channel.

In some embodiments, the air conditioning unit further comprises a booster pump, and an air outlet of the booster pump is communicated with the ventilation channel.

Based on the technical scheme, the bearing shell is provided with the ventilation channel, gas can be introduced into the cavity between the inner wall of the bearing shell and the bump foil through the ventilation channel, the rigidity of the bump foil can be adjusted through the introduced gas, the pressure resistance of the bump foil is changed, the bearing is enabled to be better adapted to the vibration of the rotor, and the stability of a compressor applying the bearing in the embodiment of the invention in the operation process is improved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:

fig. 1 is a schematic structural view of an embodiment of a radial hydrodynamic gas bearing of the present invention.

Fig. 2 is a perspective view of an embodiment of the radial hydrodynamic gas bearing of the present invention.

Fig. 3 is a perspective view of another embodiment of the radial hydrodynamic gas bearing of the present invention.

Fig. 4 is a partial structural schematic view of an embodiment of the compressor of the present invention.

Fig. 5 is a partial schematic structural view of another embodiment of the compressor of the present invention.

Fig. 6 is a partial structural view of still another embodiment of the compressor of the present invention.

In the figure:

10. a bearing housing; 11. a vent hole; 12. a vent channel; 13. a gap; 20. a bump foil; 30. a top foil; 40. a cavity; 50. a delivery channel; 60. adjusting a valve; 70. a bearing support; 80. a rotor; 90. a stator; 100. a motor housing; 110. a refrigerant conveying pipe; 120. a booster pump.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "central," "lateral," "longitudinal," "front," "rear," "left," "right," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings for convenience in describing the invention and for simplicity in description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the scope of the invention.

In order to adapt to the complex stress process of the rotor and improve the running stability of the rotor, the inventor finds that the rigidity characteristic of the bearing can be changed according to the vibration characteristic of the rotor in the running process of the rotor, so that the bearing can adapt to the vibration of the rotor.

Based on the above thought, the inventor has improved the bearing structure. Referring to fig. 1 and 2, in one embodiment of the radial hydrodynamic gas bearing provided by the present invention, the bearing includes a bearing housing 10, a bump foil 20 and a top foil 30, wherein the bump foil 20 is disposed between the bearing housing 10 and the top foil 30, a cavity 40 is formed between an inner wall of the bearing housing 10 and the bump foil 20, and the bearing housing 10 is provided with a vent passage for introducing gas into the cavity 40.

In the above embodiment, the bearing housing 10 is provided with the ventilation channel, through which gas can be introduced into the cavity 40 between the inner wall of the bearing housing 10 and the bump foil 20, and the rigidity of the bump foil 20 can be adjusted by the introduced gas, so as to change the pressure resistance of the bump foil 20, so that the bearing can better adapt to the vibration of the rotor, and the stability of a compressor applying the bearing of the embodiment of the invention in the operation process is improved.

The bearing housing 10 is cylindrical in shape, circular in cross section, hollow in the middle, and the rotor is disposed in the central through hole of the bearing housing 10.

The specific configuration of the vent passage can be selected in many ways.

As shown in fig. 1 and 2, the vent passage includes a vent hole 11, and the vent hole 11 radially penetrates the bearing housing 10. Through the vent holes 11, gas can be guided from the outside to the inside of the bearing housing 10.

The vent channel may comprise a plurality of vent holes 11, and the plurality of vent holes 11 may be arranged in the axial and/or circumferential direction of the bearing housing 10.

As shown in fig. 1, a plurality of vent holes 11 are arranged along the circumferential direction of the bearing housing 10. Wherein a part of the ventilation holes 11 are arranged at even intervals.

As shown in fig. 2, a plurality of vent holes 11 are uniformly arranged in the axial direction of the bearing housing 10, and a plurality of rows are arranged in the circumferential direction.

The bump foil 20 includes a first wave band contacting the inner wall of the bearing housing 10 and a second wave band protruding in a direction away from the inner wall of the bearing housing 10 to form a cavity 40 between the second wave band and the inner wall of the bearing housing 10, and the vent hole 11 communicates with the cavity 40.

The convex shape of the second wavelength band in a direction away from the inner wall of the bearing housing 10 may be a semicircle or an arch.

The vent hole 11 is provided in the middle of the portion of the bearing housing 10 corresponding to the second band. The arrangement can ensure that the vent hole 11 is far away from the position of the bearing shell 10, which is in contact with the first wave band, so that the vent hole 11 is not covered by the first wave band, and the gas flowing out of the vent hole 11 can smoothly enter the cavity 40.

The axis of the vent 11 may be co-linear with the point of the cavity 40 furthest from the inner wall of the bearing housing 10, which may further ensure that the vent 11 is spaced away from the location of the bearing housing 10 in contact with the first wave band so that the vent 11 is uncovered by the first wave band.

As shown in fig. 3, the vent passage may further include a vent groove 12, the vent groove 12 extending in the axial direction of the bearing housing 10, and the vent hole 11 communicating with the vent groove 12.

Through setting up the air channel 12, can communicate a plurality of air vents 11 simultaneously along the axial, can reach a plurality of air vents 11 like this when letting in air vent 12, need not make every air vent 11 communicate with the air supply alone, be favorable to simplifying the arrangement of communicating pipe.

The vent grooves 12 are provided on the side of the bearing housing 10 remote from the bump foil 20 to facilitate communication of the vent grooves 12 with the air supply source.

The cavity 40 is interconnected with the space between the bump foil 20 and the top foil 30, such that gas introduced into the cavity 40 may also flow into the space between the bump foil 20 and the top foil 30 to increase the stiffness of the top foil 30 and change the pressure resistance of the top foil 30.

Based on the radial dynamic pressure gas bearing, the invention also provides a compressor, which comprises the radial dynamic pressure gas bearing.

As shown in fig. 4, a delivery passage 50 is provided in the compressor, the delivery passage 50 is communicated with the ventilation passage for delivering gas to the ventilation passage, and the delivery passage 50 is provided with a regulating valve 60.

The feed channel 50 may be provided on the motor housing 100 and the bearing support 70. By providing the regulating valve 60, the pressure of the gas delivered by the delivery channel 50 can be regulated, thereby regulating the stiffness of the bump foil 20 and the top foil 30 and changing the pressure resistance of the bump foil 20 and the top foil 30.

Based on the compressor, the invention further provides an air conditioning unit which comprises the compressor.

As shown in fig. 5, the air conditioning unit further includes a refrigerant delivery pipe 110, and the refrigerant delivery pipe 110 is communicated with the ventilation channel. Therefore, the rigidity of the wave foil 20 and the rigidity of the top foil 30 can be adjusted by using the refrigerant in the air conditioning unit, the utilization value of the refrigerant is improved, and the cost for arranging an external air supply source is saved.

Specifically, the refrigerant in the refrigerant delivery pipe 110 may be from an exhaust port of the compressor or from a location such as a condenser.

The refrigerant delivery pipe 110 may be directly connected to the ventilation passage, or may be indirectly connected to the ventilation passage through the delivery passage 50.

As shown in fig. 6, the air conditioning unit may further include a booster pump 120, and an air outlet of the booster pump 120 is communicated with the ventilation passage. By providing the booster pump 120, high-pressure gas can be supplied into the ventilation passage. Compared with the refrigerant in the air conditioning unit, the scheme of arranging the booster pump 120 is more convenient for controlling the pressure of the introduced gas, has higher degree of freedom, and does not lose the refrigerating capacity of the air conditioning unit. Moreover, when the compressor is in the starting stage and the pressure difference is not established at the inlet and the outlet of the compressor, the gas introduced into the ventilation channel can be provided by the booster pump 120, so that the problem that the gas cannot be normally introduced due to the absence of the pressure difference is avoided, and the problem that the rigidity of the bearing cannot be adjusted in the starting stage of the compressor is solved.

The positive technical effects of the radial dynamic pressure gas bearing in the above embodiments are also applicable to the compressor and the air conditioning unit, and are not described herein again.

The structure of an embodiment of the radial hydrodynamic gas bearing of the present invention and the structure of a compressor using the radial hydrodynamic gas bearing will be described in detail below with reference to the accompanying drawings 1 to 6:

as shown in fig. 1, the radial hydrodynamic gas bearing includes a bearing housing 10, a bump foil 20, and a top foil 30, the bump foil 20 being located between the bearing housing 10 and the top foil 30. The top foil 30 has a cylindrical shape formed by bending a sheet foil, a gap 13 is formed at a joint of both ends, and the top foil 30 is continuous in the circumferential direction. The top foil 30 is fixed to the bearing housing 10 at one end and is free at the other end.

The bump foil 20 has a segmented structure, and includes three segments, and one end of each segment of the bump foil 20 is fixed to the bearing housing 10, and the other end is a free end. Each band foil 20 includes a plurality of first bands and a plurality of second bands, the first bands and the second bands being spaced apart. The first wave band is in contact with the inner wall of the bearing housing 10 and the second wave band is convex away from the inner wall of the bearing housing 10 to form a cavity 40 between the inner wall of the bearing housing 10 and the bump foil 20.

The bearing shell 10 is provided with a plurality of vent holes 11, the vent holes 11 are communicated with the cavities 40, the vent holes 11 correspond to the cavities 40 one by one, and the number of the vent holes 11 is equal to that of the cavities 40. Also, the vent hole 11 is opened in the middle of the portion of the bearing housing 10 corresponding to the second band.

As shown in fig. 2, a plurality of vent holes 11 are uniformly arranged in the bearing housing 10 in the axial direction, and a plurality of rows are arranged in the circumferential direction.

As shown in fig. 3, a plurality of ventilation grooves 12 extending in the axial direction are further provided on the outer side of the bearing housing 10, and the ventilation holes 11 are opened in the bottom of the ventilation grooves 12.

As shown in fig. 4, the compressor includes a radial dynamic pressure gas bearing, a rotor 80, a stator 90, and a motor housing 100. The stator 90 is fixed to the motor housing 100, and the bearing holder 70 is coupled to the motor housing 100. The two bearing supports 70 are respectively located at two ends of the motor housing 100, and the two radial dynamic pressure gas bearings are respectively installed on the corresponding bearing supports 70.

The radial hydrodynamic gas bearing comprises a bearing housing 10, a bump foil 20 and a top foil 30. The rotor 80 is inserted into the central through hole of the bearing housing 10, inside the top foil 30. A gas film gap is formed between the top foil 30 and the rotor 80, and when the compressor is in operation, gas enters the gas film gap to form a dynamic pressure gas film, so that the rotor is suspended.

The motor housing 100 and the bearing support 70 are both provided with a conveying channel 50, and the conveying channel 50 is provided with a regulating valve 60.

As shown in fig. 5, the compressor further includes a refrigerant delivery pipe 110, a refrigerant participating in a cooling or heating cycle is disposed in the refrigerant delivery pipe 110, the refrigerant delivery pipe 110 is communicated with the delivery passage 50, and the delivery passage 50 is communicated with the vent hole 11.

As shown in fig. 6, the compressor further includes a booster pump 120, the booster pump 120 being for supplying a high-pressure gas, the booster pump 120 being communicated with the delivery passage 50 through a delivery pipe, the delivery passage 50 being communicated with the vent hole 11.

In other embodiments, the compressor may be provided with the refrigerant delivery pipe 110 and the booster pump 120 which are communicated with the delivery passage 50 at the same time, so that when the compressor is just started, gas can be provided by the booster pump 120 to be introduced into the ventilation passage, and the rigidity of the bearing is adjusted; when the compressor works normally, the high-pressure side gas (namely, refrigerant) of the unit can be utilized and is input into the ventilation channel through the regulating valve, the rigidity of the bearing is regulated, the variable rigidity of the bearing is realized, and the anti-interference capability of the compressor in the operation process is improved.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made without departing from the principles of the invention, and these modifications and equivalents are intended to be included within the scope of the claims.

Claims

1. A radial hydrodynamic gas bearing, comprising:

a bearing housing (10);

a top foil (30); and

a bump foil (20) arranged between the bearing housing (10) and the top foil (30) with a cavity (40) between the inner wall of the bearing housing (10) and the bump foil (20), the bearing housing (10) being provided with a venting channel for introducing gas into the cavity (40).

2. Radial hydrodynamic gas bearing according to claim 1, characterized in that the venting channels comprise venting holes (11), the venting holes (11) extending radially through the bearing housing (10).

3. Radial hydrodynamic gas bearing according to claim 2, characterized in that the venting channel comprises a plurality of said venting holes (11), the plurality of venting holes (11) being arranged in the axial and/or circumferential direction of the bearing housing (10).

4. The radial hydrodynamic gas bearing according to claim 2, characterized in that the bump foil (20) includes a first wave band contacting an inner wall of the bearing housing (10) and a second wave band protruding away from the inner wall of the bearing housing (10) to form the cavity (40) between the second wave band and the inner wall of the bearing housing (10), the vent hole (11) communicating with the cavity (40).

5. The radial hydrodynamic gas bearing according to claim 4, characterized in that the vent hole (11) is provided in the middle of the portion of the bearing housing (10) corresponding to the second wave band.

6. Radial hydrodynamic gas bearing according to claim 2, characterized in that the venting channel comprises a venting groove (12), the venting groove (12) extending in the axial direction of the bearing housing (10), the venting hole (11) communicating with the venting groove (12).

7. Radial hydrodynamic gas bearing according to claim 6, characterized in that the venting grooves (12) are provided on the side of the bearing housing (10) remote from the bump foil (20).

8. Radial hydrodynamic gas bearing according to claim 1, characterized in that the cavity (40) is in communication with the space between the bump foil (20) and the top foil (30).

9. A compressor comprising the radial dynamic pressure gas bearing according to any one of claims 1 to 8.

10. Compressor according to claim 9, characterized in that a delivery channel (50) is provided in the compressor, said delivery channel (50) communicating with said ventilation channel for delivering gas to said ventilation channel, said delivery channel (50) being provided with a regulating valve (60).

11. Air conditioning assembly, characterized in that it comprises a compressor according to claim 9 or 10.

12. The air conditioning unit as set forth in claim 11, further comprising a refrigerant delivery pipe (110), the refrigerant delivery pipe (110) communicating with the vent passage.

13. The air conditioning assembly as set forth in claim 11, further comprising a booster pump (120), an air outlet of said booster pump (120) being in communication with said vent passage.