CN111365279A

CN111365279A - Bearing seat assembly structure with annular air inlet cavity and compressor

Info

Publication number: CN111365279A
Application number: CN201811593331.5A
Authority: CN
Inventors: 刘华; 张治平; 钟瑞兴; 李宏波; 陈玉辉; 刘胜; 亓静利; 叶文腾
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2018-12-25
Filing date: 2018-12-25
Publication date: 2020-07-03

Abstract

The disclosure relates to a bearing seat assembling structure and a compressor. Bearing frame assembly structure includes: a bearing seat (20) provided with an air supply channel (21) inside; and a gas bearing (30) provided on the bearing housing (20) for supporting the rotor (10); an annular air inlet cavity (40) is arranged between the bearing seat (20) and the gas bearing (30), and the annular air inlet cavity (40) is communicated with the air supply channel (21). The bearing capacity and the rigidity of the gas bearing can be improved.

Description

Bearing seat assembly structure with annular air inlet cavity and compressor

Technical Field

The utility model relates to the technical field of bearings, especially, relate to a bearing frame assembly structure and compressor with annular air inlet chamber.

Background

A centrifugal compressor is a compressor that compresses gas by generating centrifugal force by rotation of a high-speed impeller. At present, the centrifugal compressor mainly adopts two bearings, namely an oil lubrication bearing and an electromagnetic bearing to support a rotor. Wherein, the oil lubrication bearing needs to be matched with an additional oil supply system, which results in a complex structure of the centrifugal compressor. Also, friction occurs between the oil and the rotor, resulting in energy loss. In addition, the lubricant may leak into the refrigerant, causing contamination of the refrigerant. The electromagnetic bearing has high requirements on control, poor system impact resistance and needs an additional power-off protection system.

The static pressure gas bearing is a bearing for supporting rotor by using gas pressure, belonging to oilless bearing. The bearing has a simple structure, the friction between the gas and the rotor is small, and a complex control system is not needed. The static pressure gas bearing adopts external gas supply, the gas pressure is easy to adjust, the gas can be continuously supplied at the start-stop stage of the compressor, the contact friction between the rotor and the bearing caused by insufficient gas supply at the start-stop stage is avoided, and the system stability is improved.

Disclosure of Invention

The inventor researches and discovers that the bearing capacity and the rigidity of the static pressure gas bearing adopting external gas supply influence the quality of the working performance of the static pressure gas bearing, and a proper bearing seat structure is not provided in the related technology to improve the bearing capacity and the rigidity of the static pressure gas bearing.

In view of this, the embodiments of the present disclosure provide a bearing seat assembly structure and a compressor, which can improve the bearing capacity and the rigidity of a gas bearing.

In one aspect of the present disclosure, there is provided a bearing housing assembling structure including:

the bearing seat is internally provided with an air supply channel; and

the gas bearing is arranged on the bearing seat and used for supporting the rotor;

an annular air inlet cavity is arranged between the bearing seat and the gas bearing and communicated with the air supply channel.

In some embodiments, the bearing housing includes a bearing mounting bore, the gas bearing is located within the bearing mounting bore, and the annular inlet chamber includes: and the first annular groove is arranged on the hole wall of the bearing mounting hole.

In some embodiments, the annular intake chamber further comprises: and the air inlet hole group is arranged on the circumferential outer wall of the gas bearing and is communicated with the first annular groove.

In some embodiments, at least a portion of the orifices of the set of inlet holes on one side of the circumferential outer wall are directly opposite the first annular groove.

In some embodiments, the set of inlet holes comprises a plurality of inlet holes distributed along a circumference of the gas bearing.

In some embodiments, the plurality of gas inlet holes are evenly distributed along a circumference of the gas bearing.

In some embodiments, the annular intake chamber further comprises: and the second annular groove is arranged on the circumferential outer wall of the gas bearing and is communicated with the first annular groove.

In some embodiments, at least a portion of the notch of the second annular groove on the side of the circumferentially outer wall is directly opposite the first annular groove.

In some embodiments, the bearing housing includes a bearing mounting bore, the gas bearing is located within the bearing mounting bore, and the annular inlet chamber includes: and the second annular groove is arranged on the circumferential outer wall of the gas bearing.

In some embodiments, a sealing structure is further provided between the bearing housing and the gas bearing, the sealing structure being located on at least one side of the annular inlet chamber.

In some embodiments, the sealing structure comprises: the sealing ring is arranged in the third annular groove.

In some embodiments, the bearing housing includes a bearing mounting bore, the gas bearing is located within the bearing mounting bore, and the seal structure includes a plurality of the third annular grooves arranged in an axial direction of the gas bearing.

In some embodiments, the circumferential outer wall of the gas bearing is further provided with fourth annular grooves distributed between adjacent third annular grooves in the axial direction of the gas bearing.

In another aspect of the present disclosure, there is provided a compressor including:

a housing;

a rotor; and

the bearing seat assembling structure is arranged inside the shell.

In some embodiments, a gas supply channel provided inside a bearing housing of the bearing housing assembly structure is in operable communication with a gas source outside the housing.

In some embodiments, the compressor is a centrifugal compressor.

Therefore, according to the embodiment of the disclosure, the annular air inlet cavity is arranged between the gas bearing and the bearing seat, and the annular air inlet cavity is communicated with the air supply channel inside the bearing seat, so that the working gas from the air supply channel is gathered in the annular air inlet cavity to improve the pressure of the working gas, and the working gas is more uniform in the circumferential direction of the gas bearing through the annular air inlet cavity, so that the rigidity, the bearing capacity and the working stability of the gas bearing are improved, and the working performance of the gas bearing is effectively improved.

Drawings

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

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

FIG. 1 is a schematic structural view of some embodiments of a bearing housing assembly structure according to the present disclosure;

FIGS. 2(a) and 2(b) are schematic cross-sectional and external structural views, respectively, of a gas bearing in some embodiments of a bearing housing assembly structure according to the present disclosure;

FIG. 3 is a schematic structural view of further embodiments of a bearing housing mounting structure according to the present disclosure;

FIGS. 4(a) and 4(b) are schematic cross-sectional and external structural views, respectively, of a gas bearing in further embodiments of a bearing mount assembly according to the present disclosure;

FIG. 5 is a schematic structural view of a bearing housing in some embodiments of a bearing housing assembly structure according to the present disclosure;

fig. 6 is a schematic view of the AA section in fig. 5.

It should be understood that the dimensions of the various parts shown in the figures are not drawn to scale. Further, the same or similar reference numerals denote the same or similar components.

Detailed Description

Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the disclosure, its application, or uses. The present disclosure may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that: the relative arrangement of parts and steps set forth in these embodiments should be construed as exemplary only and not as limiting unless otherwise specifically noted.

The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element preceding the word covers the element listed after the word, and does not exclude the possibility that other elements are also covered. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

In the present disclosure, when a specific device is described as being located between a first device and a second device, there may or may not be intervening devices between the specific device and the first device or the second device. When a particular device is described as being coupled to other devices, that particular device may be directly coupled to the other devices without intervening devices or may be directly coupled to the other devices with intervening devices.

All terms (including technical or scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs unless specifically defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

As shown in fig. 1, is a schematic structural view of some embodiments of a bearing housing assembly structure according to the present disclosure. Referring to fig. 1, in some embodiments, a bearing housing assembly structure includes: a bearing housing 20 and a gas bearing 30. The bearing housing 20 is provided with an air supply passage 21 inside, and the air supply passage 21 can be communicated with an air supply outside or inside the apparatus in which the bearing housing assembly structure is provided. A gas bearing 30 may be provided on the bearing housing 20 for supporting the rotor 10. In fig. 1, the gas bearing 30 is a radial gas bearing, which may be installed at a radially inner side of the bearing housing 20, and supports the rotor 10 in a radial direction by static pressure gas. In other embodiments, the gas bearing 30 is a thrust gas bearing, which may be installed on the axial left or right side of the bearing housing 20, and supports the rotor 10 in the axial direction by static pressure gas.

Referring to fig. 1, an annular air intake chamber 40 may be provided between the bearing housing 20 and the gas bearing 30, the annular air intake chamber 40 communicating with the air supply passage 21. By arranging the annular air inlet cavity 40 between the gas bearing 30 and the bearing seat 20 and communicating the annular air inlet cavity 40 with the air supply channel 21 inside the bearing seat 20, the working gas from the air supply channel 21 can be gathered in the annular air inlet cavity 40 to increase the pressure of the working gas, so that the pressurization effect is realized, and the rigidity and the bearing capacity of the gas bearing 30 are improved. Moreover, the annular gas inlet cavity 40 also makes the working gas more uniform in the circumferential direction of the gas bearing 30, thereby improving the working stability of the gas bearing 30. Thus, the present embodiment effectively improves the operational performance of the gas bearing.

In fig. 1, the rotor 10 is supported by primary and secondary gas bearings 30 and bearing blocks 20. The air inlet passage 21 in the bearing housing 20 may be provided according to the shape of the bearing housing, for example, the bearing housing 20 located at the left side (one stage) may include air inlet passages 21 which are provided vertically (perpendicular to the axis of the rotor 10) and laterally (parallel to the axis of the rotor 10) and communicate with each other. Also for example, the bearing housing 20 on the right (second stage) may include air intake passages 21 arranged in the lateral, vertical and oblique directions (at acute or obtuse angles to the axis of the rotor 10) and communicating with each other.

The secondary bearing support in fig. 1 is also illustrated with reference to fig. 5 and 6, and in some embodiments, the bearing support 20 may include a bearing mounting hole 23. The bearing mounting hole 23 may be formed in a hollow structure in the axial direction of the rotor 10 in the bearing housing 20. Gas bearings 30 are located in the bearing mounting holes 23 to provide radial support to the rotor 10. A plurality of gas flow passages 22 communicating the bearing mounting hole 23 and the outside of the bearing housing may be further provided in the bearing housing 23, one end of the gas flow passage adjacent to the bearing mounting hole 23 being located at the right side of the secondary gas bearing 30 and the other end being located at the left side of the bearing housing 20, so that the gas at the right side of the gas bearing 30 can flow to the left area of the bearing housing 20 through the gas flow passage 22. For example, the left area of the bearing housing 20 is communicated with the suction device of the compressor, and the gas of the high pressure stage on the right side of the bearing housing 20 is flowed to the left side of the bearing housing 20 through the gas flow passage 22 by the suction device and is recovered by the suction device.

Referring to fig. 1, in some embodiments, the annular intake chamber 40 includes: and a first annular groove 41 provided on a wall of the bearing mounting hole 23. Since the first annular groove 41 is in communication with both the intake passage 21 in the bearing housing 20 and the circumferential outer wall of the gas bearing 30, the working gas entering the first annular groove 41 can be collected at the circumferential outer wall of the gas bearing 30 to be pressurized. The pressure of the working gas is uniformly distributed over the entire circumference of the gas bearing 30 in the first annular groove 41, improving the stability of the operation of the gas bearing 30.

Referring to fig. 1, 2(a) and 2(b), in some embodiments, the annular intake cavity 40 further includes a set of intake holes 42. The inlet hole group 42 is provided on the circumferential outer wall of the gas bearing 30 and communicates with the first annular groove 41. The set of inlet holes 42 is capable of directing pressurized working gas collected through the first annular groove 41 into the gas bearing 30 to create static pressure.

In order to enable the air inlet set 42 to better guide the working gas, at least part of the orifices of the air inlet set 42 on the side of the circumferential outer wall is directly opposite to the first annular groove 41. It is preferable that all the orifices in the inlet hole group 42 on the side of the circumferential outer wall of the gas bearing 30 face the first annular groove 41, so that the process of the working gas entering the gas bearing 30 is smoother.

In fig. 2(b), the air inlet hole group 42 may include a plurality of air inlet holes (e.g., 5 or more) distributed along the circumferential direction of the gas bearing 30. This enables the working gas to enter from a plurality of positions in the circumferential direction of the gas bearing 30, improving the efficiency and uniformity of the entry of the working gas. Accordingly, it is preferable that the plurality of air inlet holes are uniformly distributed along the circumferential direction of the gas bearing 30, so as to further improve the uniformity of the working gas entering the gas bearing 30 and improve the working stability of the gas bearing 30.

In addition to providing a set of inlet holes in the gas bearing 30, other structures may be provided to assist in pressurizing and homogenizing the working gas into the gas bearing 30. Fig. 3 is a schematic view of other embodiments of a bearing housing assembly structure according to the present disclosure. Referring to FIG. 3, in some embodiments, the annular intake chamber 40 further includes a second annular groove 43. A second annular groove 43 is provided in the circumferential outer wall of the gas bearing 30, and communicates with the first annular groove 41. The second annular groove 43 and the first annular groove 41 can collectively collect the working gas from the intake passage 21 and guide the working gas into the gas bearing 30 more uniformly in the circumferential direction, thereby improving the rigidity, the bearing capacity, and the operational stability of the gas bearing, and further effectively improving the operational performance of the gas bearing.

In order to enable the second annular groove 43 to better conduct the working gas, at least part of the notch of the second annular groove 43 on the side of the circumferential outer wall may be directly opposite to the first annular groove 41. It is preferable that the second annular grooves 43 face the first annular grooves 41 in their entirety in order to make the process of the working gas into the gas bearing 30 smoother.

Referring to fig. 3, 4(a) and 4(b), in some embodiments, the width of second annular groove 43 may be the same as the width of first annular groove 41, while in other embodiments, the width of second annular groove 43 may not be the same as the width of first annular groove 41. Additionally, in some embodiments, where the gas bearing 30 is located within the bearing mounting bore 23, the annular inlet chamber 23 may include a second annular groove 43 and communicate the outlet of the inlet passage 21 with the second annular groove 43. The first annular groove 41 provided in the bearing mounting hole 23 can be omitted, so that the working gas can be collected and uniformly guided by the second annular groove 43, and the machining of the bearing housing 20 can be simplified.

In some embodiments, a sealing structure may also be provided between the bearing housing 20 and the gas bearing 30, the sealing structure being located on at least one side of the annular intake chamber 40. The sealing structure prevents the working gas from leaking during the process of entering the gas bearing 30, thereby improving the efficiency of the working gas and the operational stability of the gas bearing.

Referring to fig. 2(a), 2(b), 4(a), and 4(b), in some embodiments, the sealing structure comprises: a seal ring (not shown) and a third annular groove 32 provided on the gas bearing 30, the seal ring being provided in the third annular groove 32. The seal ring may be compressed between the surface of the gas bearing 30 and the bearing housing 20, isolating the annular gas inlet chamber 40 from the exterior of the gas bearing 30 and the bearing housing 20, creating a gas tight effect.

In some embodiments, the gas bearing is a radial gas bearing and the seal ring may be disposed radially outward of the gas bearing. In other embodiments, the gas bearing is a thrust gas bearing, and the seal ring may be disposed on a side of the gas bearing axially adjacent to the bearing seat.

Referring to fig. 4(b), in some embodiments, the bearing housing 20 includes a bearing mounting hole 23, the gas bearing 30 is located in the bearing mounting hole 23, and the sealing structure includes a plurality of the third annular grooves 32 arranged along an axial direction of the gas bearing 30. A sealing ring may be provided in each third annular groove 32. Preferably, a third annular groove and a sealing ring are arranged on both sides of the annular air inlet cavity 40 in the axial direction, so that the sealing effect is increased, and the arrangement of sealing structures except for the bearing seat and the gas bearing is simplified or omitted.

To facilitate the assembly of the sealing ring, a fourth annular groove 33 may be further provided on the circumferential outer wall of the gas bearing 30. The fourth annular grooves 33 may be distributed between each adjacent third annular groove 32 in the axial direction of the gas bearing 30. For example, in fig. 4(b), two third annular grooves 32 are provided on both sides of the second annular groove 43, respectively, and a fourth annular groove 33 is provided between the two mutually adjacent third annular grooves 32. This fourth annular groove 33 can be processed more extensively, and its degree of depth can be the same with third annular groove 32, more shallow or deeper, as long as it can make things convenient for the sealing washer to pass through when the sealing washer is established to the cover.

The embodiments of the bearing seat assembling structure disclosed by the disclosure can be suitable for various devices needing to be assembled with gas bearings, such as compressors. Correspondingly, the embodiment of the present disclosure further provides a compressor, including: embodiments of a housing, rotor 10, and bearing housing assembly of any of the foregoing. The bearing block assembly structure is disposed inside the housing. The compressor here may be a centrifugal compressor. In other embodiments, other compressors including rotors are also possible, such as screw compressors, sliding vane compressors, and the like. To simplify the air supply structure inside the housing, an air supply passage 21 provided inside a bearing housing 20 of the bearing housing assembly structure may be in operable communication with an air supply outside the housing.

Thus, various embodiments of the present disclosure have been described in detail. Some details that are well known in the art have not been described in order to avoid obscuring the concepts of the present disclosure. It will be fully apparent to those skilled in the art from the foregoing description how to practice the presently disclosed embodiments.

Although some specific embodiments of the present disclosure have been described in detail by way of example, it should be understood by those skilled in the art that the foregoing examples are for purposes of illustration only and are not intended to limit the scope of the present disclosure. It will be understood by those skilled in the art that various changes may be made in the above embodiments or equivalents may be substituted for elements thereof without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A bearing housing assembling structure, comprising:

a bearing seat (20) provided with an air supply channel (21) inside; and

a gas bearing (30) provided on the bearing housing (20) for supporting a rotor (10);

an annular air inlet cavity (40) is arranged between the bearing seat (20) and the gas bearing (30), and the annular air inlet cavity (40) is communicated with the air supply channel (21).

2. A bearing housing assembly structure according to claim 1, characterized in that the bearing housing (20) includes a bearing mounting hole (23), the gas bearing (30) is located in the bearing mounting hole (23), and the annular intake chamber (40) includes: a first annular groove (41) provided on a hole wall of the bearing mounting hole (23).

3. A bearing housing mounting structure according to claim 2, characterized in that the annular intake chamber (40) further comprises: and the air inlet hole group (42) is arranged on the circumferential outer wall of the gas bearing (30) and is communicated with the first annular groove (41).

4. A bearing housing assembling structure according to claim 3, wherein at least a part of the hole of said air inlet hole group (42) on the side of said circumferential outer wall is opposed to said first annular groove (41).

5. A bearing housing mounting structure according to claim 3, characterized in that the air inlet hole group (42) comprises a plurality of air inlet holes distributed along the circumferential direction of the gas bearing (30).

6. A bearing housing assembling structure according to claim 5, wherein said plurality of air intake holes are uniformly distributed along the circumferential direction of said gas bearing (30).

7. A bearing housing mounting structure according to claim 2, characterized in that the annular intake chamber (40) further comprises: a second annular groove (43) provided on a circumferential outer wall of the gas bearing (30) and communicating with the first annular groove (41).

8. A bearing housing fitting structure according to claim 7, characterized in that at least part of the notch of the second annular groove (43) on the side of the circumferential outer wall is opposed to the first annular groove (41).

9. A bearing housing assembly structure according to claim 1, characterized in that the bearing housing (20) includes a bearing mounting hole (23), the gas bearing (30) is located in the bearing mounting hole (23), and the annular intake chamber (40) includes: a second annular groove (43) provided in a circumferential outer wall of the gas bearing (30).

10. A bearing housing assembly structure according to claim 1, characterized in that a sealing structure is further provided between the bearing housing (20) and the gas bearing (30), the sealing structure being located on at least one side of the annular intake chamber (40).

11. A bearing housing assembling structure according to claim 10, wherein said seal structure comprises: the gas bearing comprises a seal ring and a third annular groove (32) arranged on the gas bearing (30), wherein the seal ring is arranged in the third annular groove (32).

12. A bearing housing assembling structure according to claim 11, wherein said bearing housing (20) includes a bearing mounting hole (23), said gas bearing (30) is located in said bearing mounting hole (23), and said seal structure includes a plurality of said third annular grooves (32) arranged in an axial direction of said gas bearing (30).

13. A bearing housing assembling structure according to claim 12, wherein a circumferential outer wall of said gas bearing (30) is further provided with fourth annular grooves (33) distributed between adjacent said third annular grooves (32) in an axial direction of said gas bearing (30).

14. A compressor, comprising:

a housing;

a rotor (10); and

a bearing housing mounting structure according to claims 1 to 13, provided inside the housing.

15. A compressor according to claim 14, wherein the air supply passage (21) provided internally of the bearing housing (20) of the bearing housing assembly is in operable communication with an air supply external to the housing.

16. The compressor of claim 14, wherein the compressor is a centrifugal compressor.