CN111878444A

CN111878444A - Thrust bearing, compressor and air conditioner

Info

Publication number: CN111878444A
Application number: CN202010871031.XA
Authority: CN
Inventors: 张治平; 钟瑞兴; 陈玉辉
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2020-08-26
Filing date: 2020-08-26
Publication date: 2020-11-03

Abstract

The invention discloses a thrust bearing, a compressor and an air conditioner, relates to the field of compressors, and aims to improve the dynamic pressure performance of the thrust bearing. The thrust bearing includes a housing and a restrictor. The casing has the through-hole that runs through, and the through-hole of casing is provided with interior concave part along axial one side surface, and the bottom of interior concave part all is provided with the air vent that runs through casing axial direction. The throttle is fixed in the inner concave part, and a first area is arranged on one side of the throttle, which is far away from the bottom of the inner concave part; the first region is configured to form a gas film of varying thickness. The thrust bearing provided by the technical scheme improves the dynamic pressure performance of the thrust bearing, increases the bearing capacity of the thrust bearing and enhances the impact resistance of the thrust bearing.

Description

Thrust bearing, compressor and air conditioner

Technical Field

The invention relates to the field of compressors, in particular to a thrust bearing, a compressor and an air conditioner.

Background

The compressor comprises a gas static pressure thrust bearing and a thrust disc which are jointed. The gas static pressure thrust bearing takes gas as a lubricating medium, and high-pressure gas flows into the thrust bearing after passing through the restrictor. The gas forms a gas film with a certain pressure distribution between the thrust bearing and the thrust disk, and a gas film force for balancing the axial force is generated.

In the related art, the aerostatic thrust bearing is provided with a restrictor on the surface of the thrust bearing. The restrictor includes a slit restrictor, a small hole restrictor, and a porous restrictor.

The inventor finds that at least the following problems exist in the prior art: the bearing capacity of the gas static pressure thrust bearing is determined by the gas film force formed after the compressed gas passes through the restrictor, and is closely related to the magnitude of the gas supply pressure. The axial force of the refrigeration compressor is closely related to the rotating speed, the working condition of the compressor is changed frequently, and the rotating speed is also changed continuously, so that the axial force of the rotor fluctuates. However, in the related art, at a certain supply pressure, the magnitude of the film force between the aerostatic thrust bearing and the thrust disk is determined, which makes the film force unable to balance with the axial force, thereby causing unstable operation of the compressor.

Disclosure of Invention

The invention provides a thrust bearing, a compressor and an air conditioner, which are used for improving the dynamic pressure performance of the thrust bearing.

Some embodiments of the present invention provide a thrust bearing, comprising:

the shell is provided with a through hole, an inner concave part is arranged on one side surface of the through hole of the shell along the axial direction, and vent holes penetrating through the shell in the axial direction are formed in the bottom of the inner concave part; and

the throttle is fixed in the inner concave part, and a first area is arranged on one side of the throttle, which is far away from the bottom of the inner concave part; the first region is configured to form a gas film of varying thickness.

In some embodiments, a side of the restrictor, which is far away from the bottom of the concave part, is further provided with a second region, and the second region is adjacent to the first region;

wherein the second region is located downstream of the first region in a rotational direction of a rotor on which the thrust bearing is mounted.

In some embodiments, the second region is provided with an air slot.

In some embodiments, the second regions are provided in rows with inwardly recessed air slots.

In some embodiments, the gas cell is configured as one of: herringbone grooves, spiral grooves and trapezoidal grooves.

In some embodiments, the intersection of two slots of said herringbone slot is located downstream of the other region of said two slots themselves.

In some embodiments, the first region forms a film having a thickness that gradually decreases in a rotational direction of a rotor on which the thrust bearing is mounted.

In some embodiments, the first region is configured as a slope, and one side of the first region connected to the second region is higher than the other side of the first region.

In some embodiments, the slope angle is 3 ° to 6 °.

In some embodiments, the height of the side of the first region connected to the second region is 15 to 25 μm higher than the other side of the first region.

In some embodiments, a plurality of the inner recesses are provided along a circumferential direction of the housing, at least one of the flow restrictors is fixed in each of the inner recesses, and the vent hole is provided at a bottom of each of the inner recesses.

In some embodiments, the material of the restrictor is isostatic graphite.

Other embodiments of the present invention provide a compressor including the thrust bearing according to any of the above aspects of the present invention.

Still other embodiments of the present invention provide an air conditioner including the compressor according to any one of the above aspects of the present invention.

According to the thrust bearing provided by the technical scheme, the throttler is arranged in the concave part of the shell of the thrust bearing, the throttler is provided with the first area, after the thrust bearing is arranged on the compressor, an air film with variable thickness can be formed between the thrust bearing and the thrust disc, the thickness of the air film can influence the magnitude of the air film force, and when the rotating speed of the compressor is high, the air film force is large; when the rotating speed of the compressor is small, the gas film force is small. The performance enables the air film force provided by the air film to be related to the rotating speed of the compressor, so that the dynamic pressure performance of the thrust bearing is improved, the bearing capacity of the thrust bearing is increased, and the impact resistance of the thrust bearing is enhanced. And the thrust bearing adopts gas lubrication, so that the energy loss of the thrust bearing is reduced, and the energy utilization rate of the compressor is integrally 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 diagram of a thrust bearing according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a thrust bearing restrictor in a front view according to an embodiment of the present invention;

fig. 3 is a schematic top view of a thrust bearing restrictor according to an embodiment of the present invention.

Detailed Description

The technical solution provided by the present invention is explained in more detail with reference to fig. 1 to 3.

Referring to fig. 1, some embodiments of the present invention provide a thrust bearing comprising a housing 1 and a restrictor 2.

The housing 1 mainly functions to fix the restrictor 2 and provide an air supply passage for the restrictor 2. The housing 1 has a through hole 11 therethrough, and the through hole 11 of the housing 1 is provided with an inner concave portion 12 along one side surface in the axial direction, and the bottom of the inner concave portion 12 is provided with a vent hole 13 penetrating the housing 1 in the axial direction. The housing 1 is used to provide support and the housing 1 is disc-shaped. A through hole 11 is provided in the middle of the housing 1, and the through hole 11 is used for passing through a rotating shaft of the compressor. One side surface of the housing 1 is provided with an inward recess 12 which is inwardly recessed, and the inward recess 12 is used for mounting the restrictor 2. The restrictor 2 is adhesively mounted in the inner recess 12 by glue, for example.

The throttle 2 comprises two opposing surfaces: a first surface and a second surface. The first surface conforms to the bottom surface of the interior recess 12 and the second surface is substantially flush with the top of the interior recess 12. The side of the throttle 2 remote from the bottom of the recess 12, i.e. the side where the second surface is located, is provided with a first region 21. The first region 21 is configured to form a gas film of varying thickness. The throttler 2 adopts a fan-shaped structure, the inner side is close to the through hole 11, and the outer side is far away from the through hole 11. The arc length of the inner side is shorter than the arc length of the outer side.

The throttleer 2 is made of isostatic pressing graphite or sintered porous material. Sintered porous materials such as metals, ceramic sintered materials. The isostatic pressing graphite material and the sintered porous material are used as porous materials, have the characteristics of good temperature resistance, high compressive strength, stable chemical properties, good machining performance and the like, and can adapt to the working environment of refrigerant media of refrigeration compressors.

According to the thrust bearing provided by the technical scheme, the first area 21 is provided, and the first area 21 can form the air film with the variable thickness, so that the thrust bearing is a hydrostatic bearing, but has a good dynamic pressure effect, and the bearing capacity of the thrust bearing is improved.

In some embodiments, the side of the throttle 2 remote from the bottom of the recess 12 (i.e. the side where the second surface is located) is also provided with a second region 22. The first region 21 is integrally formed with the second region 22 or otherwise fixedly attached (e.g., sintered, etc.). The second region 22 is a flat plate parallel to the bearing housing 1. The second region 22 is provided with an air groove 22 a. The second region 22 is located downstream of the first region 21 in the rotational direction W of the rotor on which the thrust bearing is mounted. The direction of rotation of the rotor to which the thrust bearing is mounted is unidirectional, and the situation illustrated in fig. 1 is a clockwise rotation.

For each flow restrictor 2, a second region 22 of the flow restrictor 2 is arranged at the front end of the first region 21 (i.e. downstream in the direction of rotation of the rotor to which the thrust bearing is mounted), and the gas flows through the wedge-shaped region and enters the second region 22. The air groove 22a can effectively increase the dynamic pressure effect of the thrust bearing and enhance the impact resistance of the thrust bearing.

The thrust bearing provided by the technical scheme is an aerostatic thrust bearing, but has good dynamic pressure effect, good impact resistance and larger bearing capacity, so that the dynamic pressure performance of the thrust bearing and the provided bearing capacity are related to the air supply pressure and the rotating speed of the compressor, the bearing capacity is increased along with the increase of the air supply pressure and is increased along with the increase of the rotating speed, and the thrust bearing can better adapt to the requirements of the complex working conditions of the refrigeration compressor on the performance of the thrust bearing.

Referring to fig. 1 and 2, in some embodiments, the second regions 22 are arranged in rows with inwardly recessed air slots 22 a. The air groove 22a is formed with a certain depth in the rotational direction. The second region 22 is provided with two rows of air discharge grooves 22a, and the number of the air discharge grooves 22a close to the center direction is less than that of the air discharge grooves 22a close to the edge direction, so that the structure has better dynamic pressure performance.

The air grooves 22a are, for example, herringbone-shaped air grooves, other types of air groove 22a structures that enhance the dynamic pressure effect, such as spiral air grooves, trapezoidal air grooves, etc. The air slots 22a may be arranged uniformly or in a staggered manner. The arrangement number and the arrangement position of the air slots 22a can be flexibly adjusted according to the requirement of the system on the axial force. The spacing, width and depth of the air grooves 22a are determined according to the actual size of the bearing. The depth of the air groove 22a is small compared to the thickness of the throttle 2 and therefore does not affect the effectiveness of the throttle 2. The depth of the air grooves 22a is, for example, 5 μm to 20 μm, specifically, 5 μm, 8 μm, 10 μm, 14 μm, 16 μm, and 20 μm.

Referring to fig. 1 and 2, in some embodiments, the intersection of two slots of the herringbone slot is located downstream of other areas of each air slot 22a itself. The air grooves 22a of the herringbone grooves enhance the dynamic pressure effect and improve the impact resistance of the thrust bearing.

Referring to fig. 1 and 2, in some embodiments, the first region 21 is configured as a slope, and one side of the first region 21 connected to the second region 22 is higher than the other side of the first region 21. The thickness of the throttle 2 corresponding to the first region 21 gradually increases and the thickness of the air film gradually decreases in the rotational direction of the rotor on which the thrust bearing is mounted. The above-described shape of the first region 21 is also referred to as: the direction of convergence of the first region 21 of the throttle 2 is the same as the direction of rotation of the thrust bearing. The convergent area is formed by changing the thickness of the restrictor 2, and the first area 21 is arranged in the bearing rotation direction, so that the gas film thickness of the thrust bearing is gradually reduced in the rotation direction, the gas film is converged, the gas film pressure is increased, and the bearing capacity is increased.

Referring to fig. 1 and 2, in some embodiments, the slope angle a of the ramp is 3 ° to 6 °.

Referring to fig. 1 and 2, in some embodiments, the height of one side of the first region 21 connected to the second region 22 is 15 to 25 μm higher than the other side of the first region 21. The size variation of the wedge-shaped region is around 20 μm, which is small compared to the thickness of the throttle 2. The wedge-shaped area has little effect on the thickness of the throttle 2.

Referring to fig. 1 and 2, in some embodiments, a plurality of inner recesses 12 are provided along the circumferential direction of the housing 1, at least one restrictor 2 is fixed in each inner recess 12, and a bottom of each inner recess 12 is provided with a vent hole 13. The thrust bearing that above-mentioned technical scheme provided has polylith flow controller 2, and the 2 tile block structures of multisection flow controller make the air feed pressure of tile more even, and thrust bearing has obtained even air film pressure in the direction of circumference, finally makes thrust bearing in the ascending pressure evenly distributed of direction of circumference.

The compressor also comprises a thrust disc, the thrust disc and the side of the thrust bearing provided with the restrictor 2 are attached, and a gas film with variable thickness is formed between the thrust disc and the first region 21 of the thrust bearing.

In the description of the present invention, it is to be understood that the terms "central", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the scope of the present invention.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: it is to be understood that modifications may be made to the technical solutions described in the foregoing embodiments, or equivalents may be substituted for some of the technical features thereof, but such modifications or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A thrust bearing, comprising:

the air conditioner comprises a shell (1) and a fan, wherein the shell (1) is provided with a through hole (11) in a penetrating mode, an inner concave part (12) is arranged on one side surface of the through hole (11) of the shell (1) along the axial direction, and vent holes (13) penetrating through the shell (1) in the axial direction are formed in the bottom of the inner concave part (12); and

the flow restrictor (2) is fixed in the concave part (12), and a first region (21) is arranged on one side, away from the bottom of the concave part (12), of the flow restrictor (2); the first region (21) is configured to form a gas film of varying thickness.

2. A thrust bearing according to claim 1, characterized in that the side of the restrictor (2) remote from the bottom of the recess (12) is further provided with a second region (22), the second region (22) being adjacent to the first region (21);

wherein the second region (22) is located downstream of the first region (21) in the direction of rotation of the rotor on which the thrust bearing is mounted.

3. A thrust bearing according to claim 2, wherein the second region (22) is provided with air grooves (22 a).

4. A thrust bearing according to claim 3, wherein the second regions (22) are provided in rows with the air grooves (22a) recessed inwards.

5. A thrust bearing according to claim 4, wherein the air groove (22a) is configured as one of: herringbone grooves, spiral grooves and trapezoidal grooves.

6. A thrust bearing according to claim 5, wherein the intersection of two grooves of the herringbone groove is located downstream of the other region of the two grooves themselves.

7. A thrust bearing according to claim 1 or 2, wherein the first region (21) forms a film of gas having a thickness which tapers in the direction of rotation of the rotor on which the thrust bearing is mounted.

8. A thrust bearing according to claim 2, characterized in that the first region (21) is configured as a ramp and that the first region (21) is connected to the second region (22) on one side higher than the other side of the first region (21).

9. A thrust bearing according to claim 8, wherein the angle of inclination of the ramp is from 3 ° to 6 °.

10. The thrust bearing according to claim 8, wherein a height of a side of the first region (21) connected to the second region (22) is higher than another side of the first region (21) by 15 μm to 25 μm.

11. A thrust bearing according to claim 1 or 2, wherein a plurality of the inner recesses (12) are provided along a circumferential direction of the housing (1), at least one of the flow restrictors (2) is fixed in each of the inner recesses (12), and the bottom of each of the inner recesses (12) is provided with the vent hole (13).

12. Thrust bearing according to claim 1, characterized in that the material of the restrictor (2) is isostatic graphite or sintered porous material.

13. A compressor comprising the thrust bearing as set forth in any one of claims 1 to 12.

14. An air conditioner characterized by comprising the compressor of claim 13.