CN210859561U

CN210859561U - Gas bearing

Info

Publication number: CN210859561U
Application number: CN201921351093.7U
Authority: CN
Inventors: 胡余生; 陈彬; 贾金信; 苏久展; 闫瑾; 刘鹏辉
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2019-08-19
Filing date: 2019-08-19
Publication date: 2020-06-26
Anticipated expiration: 2029-08-19

Abstract

The utility model provides a gas bearing relates to the bearing field. The method comprises the following steps: the magnetic bearing comprises a bearing sleeve, a foil and a magnetic support assembly, wherein the foil is arranged inside the bearing sleeve, and the magnetic support assembly is arranged between the foil and the bearing sleeve; the magnetic support assembly comprises a first magnetic part and a second magnetic part, the first magnetic part is arranged on one side, close to the bearing sleeve, of the foil, the second magnetic part is arranged on one side, far away from the foil, of the first magnetic part, and repulsive force is arranged between the first magnetic part and the second magnetic part. The utility model provides a gas bearing is because repulsion has between first magnetic part and the second magnetic part for first magnetic part receives the power to the foil orientation from the second magnetic part, thereby provides the holding power for the foil, increases gas bearing's load-carrying capacity. Meanwhile, due to the fact that repulsive force exists between the first magnetic part and the second magnetic part, supporting force can be provided for the foil without actual contact between the first magnetic part and the second magnetic part, the problem of mechanical friction is avoided, and the service life of the gas bearing is prolonged.

Description

Gas bearing

Technical Field

The utility model relates to a bearing field particularly, relates to a gas bearing.

Background

The dynamic pressure gas foil bearing is a bearing using gas as a lubricant, and is more and more widely applied to the fields of high speed and ultrahigh speed due to the characteristics of high rotating speed, high precision, high temperature resistance, no radiation, no pollution, low noise, long service life, simple and compact structure and the like. However, the upper load limit of the hydrodynamic foil bearing is generally low. In order to improve the load capacity of the conventional hydrodynamic gas foil bearing, a support sheet is added between a bearing sleeve and a foil to enhance the weighing capacity of the foil, but the support sheet and the foil are supported in a contact manner, so that mechanical friction is generated between the support sheet and the foil, and the service life of the hydrodynamic gas foil bearing is shortened.

SUMMERY OF THE UTILITY MODEL

The utility model provides a gas bearing aims at improving and adopts the contact support between current dynamic pressure gas foil bearing inner support piece and the foil, can produce mechanical friction between the two, leads to the problem that dynamic pressure gas foil bearing life reduces.

The utility model discloses a realize like this:

a gas bearing comprising: the magnetic bearing comprises a bearing sleeve, a foil and a magnetic support assembly, wherein the foil is arranged inside the bearing sleeve, and the magnetic support assembly is arranged between the foil and the bearing sleeve;

the magnetic support assembly comprises a first magnetic part and a second magnetic part, the first magnetic part is arranged on one side, close to the bearing sleeve, of the foil, the second magnetic part is arranged on one side, far away from the foil, of the first magnetic part, and repulsive force is formed between the first magnetic part and the second magnetic part.

Further, in a preferred embodiment of the present invention, the first magnetic member is made of a permanent magnet.

Further, in a preferred embodiment of the present invention, the second magnetic member includes a core and a winding, and the winding is disposed on the core.

Further, in the preferred embodiment of the present invention, an installation groove for installing the second magnetic member is disposed on the inner side wall of the bearing housing.

Further, in a preferred embodiment of the present invention, the second magnetic member is made of a permanent magnet.

Further, in a preferred embodiment of the present invention, the foil is plural, and the magnetic supporting component is disposed between each of the foil and the bearing housing.

Further, in a preferred embodiment of the present invention, a plurality of the magnetic supporting members are disposed between each of the foils and the bearing housing.

Further, in a preferred embodiment of the present invention, each of the foils includes a supporting portion and a fixing portion connected to each other, and a fixing groove for fixing the fixing portion is provided on an inner sidewall of the bearing housing.

Further, in the preferred embodiment of the present invention, the supporting portions are a plurality of, the supporting portions are separated from each other and are all connected to the fixing portion, and each of the supporting portions and the bearing housing are provided with the magnetic supporting component therebetween.

Further, in a preferred embodiment of the present invention, the foil is made of a non-magnetic material.

The utility model has the advantages that: the utility model discloses a gas bearing that above-mentioned design obtained because repulsion has between first magnetic part and the second magnetic part for first magnetic part receives the power to the foil direction from the second magnetic part, thereby provides the holding power for the foil, increases gas bearing's load-carrying capacity. Meanwhile, due to the fact that repulsive force exists between the first magnetic part and the second magnetic part, supporting force can be provided for the foil without actual contact between the first magnetic part and the second magnetic part, the problem of mechanical friction is avoided, and the service life of the gas bearing is prolonged.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a gas bearing according to an embodiment of the present invention;

FIG. 2 is an enlarged view of portion A of FIG. 1;

fig. 3 is a schematic diagram of an internal structure of a gas bearing according to an embodiment of the present invention;

FIG. 4 is an enlarged view of portion B of FIG. 3;

fig. 5 is a schematic structural diagram of a bearing housing in a gas bearing according to an embodiment of the present invention;

fig. 6 is a schematic view illustrating a connection relationship between a foil and a first magnetic member in a gas bearing according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of a foil in a gas bearing according to an embodiment of the present invention.

Icon: a bearing housing 1; a mounting groove 11; a fixing groove 12; a foil 2; a fixed portion 21; a support portion 22; a magnetic support assembly 3; the first magnetic member 31; a second magnetic member 32; an iron core 321; and a winding 322.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined to clearly and completely describe the technical solutions of the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Referring to fig. 1 to 7, the present embodiment provides a gas bearing, including: bearing bush 1, foil 2 and magnetic support assembly 3. Bearing housing 1 is the tube-shape, and foil piece 2 sets up in bearing housing 1 inside, and foil piece 2 is the arc, and extends along the circumference of 1 inside wall of bearing housing, has certain clearance between foil piece 2 and the bearing housing 1, and magnetism supporting component 3 sets up between foil piece 2 and bearing housing 1 for provide along the radial just inward holding power of bearing housing 1 for foil piece 2. Be equipped with electromagnetic assembly on the bearing housing 1 for provide the electromagnetic force for the pivot when gas bearing is connected with the pivot, make pneumatic bearing can normal use. The electromagnetic assembly may be one commonly used in the existing hydrodynamic gas foil 2 bearing. In particular, since the foil 2 is deformed to some extent during the application, the foil 2 is made of an elastic material in this embodiment.

The magnetic support assembly 3 includes a first magnetic member 31 and a second magnetic member 32, the first magnetic member 31 is disposed on a side of the foil 2 close to the bearing housing 1, that is, on a side of the foil 2 facing an inner side wall of the bearing housing 1, and may be connected by using an adhesive or a slot.

The second magnetic member 32 is disposed on a side of the first magnetic member 31 away from the foil 2, that is, the second magnetic member 32 is located between the first magnetic member 31 and an inner sidewall of the bearing housing 1, and a repulsive force is provided between the first magnetic member 31 and the second magnetic member 32. In practice, the second magnetic member 32 may be a separate fixing structure for fixing the second magnetic member, or may be directly connected to the inner sidewall of the bearing housing 1. In order to make the first magnetic member 31 and the second magnetic member 32 fit each other more stably, the first magnetic member 31 and the second magnetic member 32 are disposed to face each other.

In the gas bearing provided by the embodiment, since the first magnetic member 31 and the second magnetic member 32 have the repulsive force therebetween, the first magnetic member 31 receives the force from the second magnetic member 32 in the direction of the foil 2 (the force along the radial direction of the bearing housing 1 and in the direction of the axial center of the bearing housing 1), thereby providing a supporting force for the foil 2 and increasing the load-carrying capacity of the gas bearing. Meanwhile, as the repulsive force exists between the first magnetic part 31 and the second magnetic part 32, the first magnetic part and the second magnetic part can provide supporting force for the foil 2 without actual contact, thereby avoiding the problem of mechanical friction and prolonging the service life of the gas bearing.

Further, referring to fig. 1 to 4, in the present embodiment, the first magnetic member 31 is made of a permanent magnet. In practice, the first magnetic member 31 is sheet-shaped and has a certain curvature, so that it can be adhered to the surface of the foil 2. The first magnetic member 31 is fixed to the foil 2 by an adhesive, so that the first magnetic member 31 is prevented from sliding relative to the foil 2. The second magnetic member 32 may be made of a permanent magnet or may be in the form of an electromagnet. When the second magnetic member 32 is made of a permanent magnet, in order to ensure that a repulsive force can be generated between the first magnetic member 31 and the second magnetic member 32, the magnetic properties of the opposite end surfaces of the first magnetic member 31 and the second magnetic member 32 are the same. When in application, the material and the size of the permanent magnet are selected adaptively according to the size of the supporting force required by the foil 2.

Referring to fig. 3 and 4, when the second magnetic member 32 is in the form of an electromagnet, the second magnetic member 32 includes an iron core 321 and a winding 322, the winding 322 is disposed on the iron core 321, and specifically, the winding 322 is wound on the magnet. When the magnetic circuit is applied, the winding 322 is energized, i.e. the second magnetic member 32 generates magnetism, so that a repulsive force is generated between the first magnetic member 31 and the second magnetic member 32.

In this embodiment, the second magnetic member 32 takes the form of an electromagnet. Because the electro-magnet can change the magnetism size of electro-magnet through adjusting parameters such as winding 322 circular telegram size, winding 322 number of turns and winding 322 diameter when using for the holding power that magnetism supporting component 3 provided can adapt to multiple application environment, thereby makes the application scope of the gas bearing that this embodiment provided wider, and can the adaptability ground adjust the holding power size when using.

In order to reduce the influence of the weight of the first magnetic member 31 on the foil 2, the thickness of the first magnetic member 31 is set as thin as possible in practical use. Accordingly, in order to ensure that the magnetic support assembly 3 can provide sufficient supporting force to the foil 2, the second magnetic member 32, whether in the form of a permanent magnet or an electromagnet, has to be increased in volume, which results in an increased volume of the gas bearing. In order to avoid the gas bearing from being too large in volume, in the present embodiment, the inner side wall of the bearing sleeve 1 is provided with a mounting groove 11 for mounting the second magnetic member 32, the position of the mounting groove 11 corresponds to the position of the second magnetic member 32, and the depth direction of the mounting groove 11 extends along the radial direction of the bearing sleeve 1. When the gas bearing is applied, the second magnetic part 32 is wholly or partially arranged in the mounting groove 11, so that a gap between the foil 2 and the inner side wall of the bearing sleeve 1 cannot be enlarged due to the overlarge volume of the second magnetic part 32, and the problem of overlarge volume of the gas bearing is avoided. And simultaneously, the problem of the second permanent magnet moving in application can be prevented.

Specifically, referring to fig. 1 and fig. 6, in practical application, one or more foils 2 are provided, in this embodiment, three foils 2 are provided, and the three foils 2 are independent and uniformly disposed. The foils 2 are arranged to be independent from each other, so that the volume of a single foil 2 is not too large, and the manufacturing difficulty is reduced. And the mutually independent foils 2 can not influence each other when stressed, thereby enhancing the stability of the gas bearing during working. In order to ensure that each foil 2 can be provided with sufficient supporting force, a magnetic supporting component 3 is arranged between each foil 2 and the inner side wall of the supporting sleeve.

Further, in this embodiment, a plurality of magnetic supporting components 3 are disposed between each foil 2 and the inner sidewall of the bearing housing 1, and when the magnetic bearing component is applied, each magnetic supporting component 3 can be regarded as a point, and supporting points formed by the plurality of magnetic supporting components 3 form a supporting surface together, so that supporting force applied to the foil 2 is more uniform. Meanwhile, in practical application, due to the comprehensive influence of various internal and external factors, the force applied to one side, away from the inner side wall of the bearing sleeve 1, of the foil 2 is uneven, the condition that the stress of a local position is greater than that of a peripheral position can exist, the magnetic supporting assemblies 3 are arranged in a plurality of ways, the supporting force of the magnetic supporting assemblies 3 corresponding to the positions can be increased according to the stress condition of the foil 2, and the stability of the gas bearing is improved.

Further, referring to fig. 5 and 7, in order to avoid the separation of the foils 2 from the bearing housing 1, in the embodiment, each foil 2 includes a supporting portion 22 and a fixing portion 21 connected to each other, and the fixing groove 12 for fixing the fixing portion 21 is disposed on the inner side wall of the bearing housing 1. The supporting part 22 is arc sheet, and the opening direction of the arc sheet-shaped supporting part 22 is towards the axle center of the bearing sleeve 1, and the fixed part 21 sets up in the edge of supporting part 22 along the bearing sleeve 1 circumference, presents for turn-ups form, and extends towards the inside wall of bearing sleeve 1 along the radial of bearing sleeve 1, and during the use, the fixed part 21 is inserted and is located in the fixed slot 12. Specifically, the fixing portion 21 is interference-fitted with the fixing groove 12.

Further, referring to fig. 7, in the present embodiment, the supporting portion 22 is multiple, the supporting portions 22 are separated from each other and are all connected to the fixing portion 21, and the supporting portions 22 are arranged along the axial direction of the bearing housing 1. Each foil 2 is provided with a plurality of mutually independent supporting parts 22, so that when the stress of one supporting part 22 is overlarge, the influence on other supporting parts 22 is avoided, and the influence of the local overlarge stress of the foil 2 on the overall stability of the gas bearing is reduced. Accordingly, a magnetic support assembly 3 is provided between each support 22 and the bearing housing 1. And each support part 22 corresponds to a plurality of magnetic support components 3, further reducing the influence of local over-stress of the foil 2 on the overall stability of the gas bearing. Specifically, the plurality of magnetic support assemblies 3 corresponding to each foil 2 are arranged in an array and are uniformly arranged. More specifically, the plurality of magnetic support assemblies 3 corresponding to each support portion 22 are uniformly arranged along the circumferential direction of the bearing housing 1.

Further, since the gas bearing supports the connected rotating shaft by magnetic force, the magnetic field of the electromagnetic assembly interacts with the rotating shaft. In order to avoid that the magnetic field of the magnetic support assembly 3 has an influence on the magnetic field of the electromagnetic assembly, the foil 2 is made of a non-magnetic material in this embodiment. To improve the stability of the gas bearing.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A gas bearing, comprising: the magnetic bearing comprises a bearing sleeve, a foil and a magnetic support assembly, wherein the foil is arranged inside the bearing sleeve, and the magnetic support assembly is arranged between the foil and the bearing sleeve;

2. The gas bearing of claim 1, wherein the first magnetic member is made of a permanent magnet.

3. The gas bearing of claim 2, wherein the second magnetic member includes a core and a winding disposed on the core.

4. The gas bearing of claim 3, wherein the inner sidewall of the bearing housing is provided with a mounting groove for mounting the second magnetic member.

5. A gas bearing according to claim 2, wherein the second magnetic member is made of a permanent magnet.

6. A gas bearing according to any of claims 1 to 5, wherein there are a plurality of said foils and said magnetic support assembly is provided between each of said foils and said bearing housing.

7. A gas bearing according to claim 6 wherein a plurality of said magnetic support assemblies are provided between each said foil and said bearing housing.

8. The gas bearing of claim 7, wherein each of the foils comprises a supporting portion and a fixing portion connected to each other, and a fixing groove for fixing the fixing portion is provided on an inner sidewall of the bearing housing.

9. The gas bearing of claim 8, wherein the supporting portion is a plurality of supporting portions, the plurality of supporting portions are separated from each other and connected to the fixing portion, and the magnetic supporting member is disposed between each supporting portion and the bearing housing.

10. A gas bearing according to claim 1, wherein the foil is made of a non-magnetically conductive material.