CN218564173U

CN218564173U - Air bearing and equipment

Info

Publication number: CN218564173U
Application number: CN202222941965.3U
Authority: CN
Inventors: 董迎波; 陈玉辉; 叶文腾
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2022-11-04
Filing date: 2022-11-04
Publication date: 2023-03-03
Anticipated expiration: 2032-11-04

Abstract

The utility model discloses an air supporting bearing and equipment, air supporting bearing includes: the wave foil comprises a plurality of first foil pieces which are sequentially arranged along the circumferential direction of the bearing shell at intervals, a plurality of second foil pieces which are sequentially arranged along the circumferential direction of the bearing shell at intervals, and a plurality of third foil pieces which are sequentially arranged along the circumferential direction of the bearing shell at intervals. The utility model provides an air supporting bearing has formed the hierarchical formula structure that bears the load through first foil, second foil and third foil, and wherein first foil forms first load layer and can bear the light-duty load, and the second load layer that the second foil formed can bear the medium-duty load, and the third load layer that the third foil formed can bear the heavy-duty load, satisfies the operation demand of different loads, effectively improves air supporting bearing's damping rigidity.

Description

Air bearing and equipment

Technical Field

The utility model relates to a bearing technical field especially relates to an air supporting bearing and equipment.

Background

The air bearing is a dynamic pressure bearing using gas in the surrounding environment as a lubricant and foil as an elastic support member, and has been commercialized and widely used in air refrigeration systems since 20 th century and 70 s abroad. As shown in FIG. 1, an air bearing comprises three main structural components: top foil, bump foil and bearing housing. The top foil and the wave foil are positioned in the bearing sleeve and are matched with each other to form an arc-shaped flexible surface, so that structural rigidity and damping performance are provided for the bearing.

In the prior art, the rigidity of the wave foil is generally a certain value and can only meet the operation requirement of one load. However, the load of the equipment changes during the operation process, so the air bearing in the prior art cannot meet the operation requirements under different loads.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a solve among the above-mentioned prior art technical problem that air bearing can't satisfy the operation demand of different loads, provide an air bearing and equipment.

The utility model adopts the technical proposal that:

the utility model provides an air supporting bearing and equipment, air supporting bearing includes: the bearing housing sets gradually inboard ripples foil and top foil of bearing housing, ripples foil includes a plurality of along the first foil that the circumference of bearing housing set up at interval in proper order, a plurality of along the second foil that the circumference of bearing housing set up at interval in proper order, a plurality of along the circumference of bearing housing set up at interval in proper order the third foil, first foil the second foil with the third foil is in the radial ascending height of bearing housing reduces in proper order, first foil the second foil with the rigidity of third foil increases in proper order.

Further, the number of the first foil, the second foil and the third foil is reduced in sequence.

The bearing comprises a bearing shell, a first foil, a second foil and a third foil, wherein the bearing shell is provided with a bearing outer ring, the first foil, the second foil and the third foil are fixed on an inner ring of the bottom layer fixing ring, and an outer ring of the bottom layer fixing ring is attached to the bearing outer ring.

Further, be equipped with a plurality of recesses in proper order along circumference on the outer lane of bottom retainer plate, the material of bottom retainer plate is flexible material.

Preferably, the first foil comprises two circles connected in parallel, any one of the circles is fixed to the bottom layer fixing ring, and the circle centers of the two circles and the circle center of the bearing shell pass through the same straight line.

Preferably, the second foil is in a regular hexagonal shape, the second foil includes a first inner angle and a second inner angle, the first inner angle is larger than the second inner angle, and the edge of the second foil connected with the bottom fixing ring corresponds to the two second inner angles.

Preferably, the third foil is in a trapezoid shape, and the lower bottom of the third foil is connected with the bottom layer fixing ring.

Preferably, the first foil is made of rubber, the second foil is made of steel, and the third foil is made of composite metal.

Preferably, each of said second foils is disposed between two of said first foils and each of said third foils is disposed between two of said first foils.

Apparatus comprising an air bearing as hereinbefore described.

Compared with the prior art, the utility model provides an air supporting bearing has formed the hierarchical formula structure that bears the load through first foil piece, second foil piece and third foil piece, and wherein first foil piece forms the first load layer and can bear the weight of light level load, and the second load layer that the second foil piece formed can bear the weight of medium level load, and the third load layer that the third foil piece formed can bear the weight of heavy level load, satisfies the operation demand of different loads, has effectively improved air supporting bearing's damping rigidity.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.

FIG. 1 is a schematic diagram of a prior art air bearing;

FIG. 2 is a schematic view of an overall structure of an air bearing according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a bump foil in an embodiment of the present invention;

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

1. a bearing housing; 2. a bump foil; 21. a first foil; 22. a second foil; 23. a third foil; 3. a top foil; 4. a rotating shaft; 5. the bottom layer fixing ring.

Detailed Description

In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The stiffness of the prior art bump foils is typically of a certain value, so that they can only meet the operational requirements of one load. However, the load of the equipment changes during the operation process, so the air bearing in the prior art cannot meet the operation requirements under different loads.

To sum up, in order to solve the technical problem that air supporting bearing can't satisfy the operation demand of different loads among the prior art, the utility model provides an air supporting bearing, include:

the bearing comprises a bearing shell, and a wave foil and a top foil which are sequentially arranged on the inner side of the bearing shell. In particular, the bump foil comprises a plurality of first foil pieces which are sequentially arranged at intervals along the circumferential direction of the bearing shell, a plurality of second foil pieces which are sequentially arranged at intervals along the circumferential direction of the bearing shell, and a plurality of third foil pieces which are sequentially arranged at intervals along the circumferential direction of the bearing shell. The heights of the first foil, the second foil and the third foil in the radial direction of the bearing shell are sequentially reduced, and the rigidity of the first foil, the rigidity of the second foil and the rigidity of the third foil are sequentially increased.

Thus, the plurality of first foils forms a first load layer, the plurality of second foils forms a second load layer, and the plurality of third foils forms a third load layer, the first, second and third load layers being spaced apart in the direction away from the centre of the bearing housing, the stiffness of the first, second and third load layers increasing in the order in which the ability of the first, second and third load layers to carry loads increases in the order in which they carry loads. Therefore, the utility model provides an air supporting bearing can bear the load of multiple difference, consequently if its load of equipment in the operation process has taken place the change, the utility model provides an air supporting bearing also can satisfy the operation demand of load.

The principles and structure of the present invention will be described in detail below with reference to the accompanying drawings and examples.

As shown in fig. 2 to 4, in the present embodiment, the air bearing includes a hollow cylindrical bearing housing 1, a bump foil 2, a top foil 3 and a rotating shaft 4 sequentially disposed inside the bearing housing 1, wherein the bump foil 2 includes a plurality of first foils 21 sequentially disposed at regular intervals along a circumferential direction of the bearing housing 1, a plurality of second foils 22 sequentially disposed at regular intervals along the circumferential direction of the bearing housing 1, and a plurality of third foils 23 sequentially disposed at regular intervals along the circumferential direction of the bearing housing 1, heights of the first foils 21, the second foils 22 and the third foils 23 in a radial direction of the bearing housing are sequentially reduced, and rigidities of the first foils 21, the second foils 22 and the third foils 23 are sequentially increased.

Further, in order to integrally fix the first foil, the second foil and the third foil in the bump foil together, a bottom layer fixing ring 5 is further arranged on the inner side of the bearing housing 1, wherein the bottom layer fixing ring 5 is arranged between the bearing housing 1 and the bump foil 2, and an outer ring of the bottom layer fixing ring 5 is attached to the bearing housing 1. Specifically, as shown in fig. 3 and 4, the first foil 21 includes two circles connected side by side, one of the circles is fixed to the inner ring of the bottom layer fixed ring 5, and the centers of the two circles, the center of the bearing housing, and the center of the bottom layer fixed ring are on a straight line. The second foil 22 is in a regular hexagonal shape, the second foil is not in a regular hexagonal shape in this embodiment, the second foil includes a first inner angle and a second inner angle, the first inner angle is larger than the second inner angle, one edge of the second foil is fixed on the inner ring of the bottom fixing ring 5, and two inner angles corresponding to the edges of the second foil connected with the bottom fixing ring are the second inner angles, so that the second foil can generate a larger deformation force to bear the load. The third foil 23 is in an isosceles trapezoid shape, and the bottom of the third foil is fixedly connected with the inner ring of the bottom layer fixing ring 5. Therefore, the plurality of first foils are uniformly arranged at intervals along the circumferential direction of the bearing shell and are wound to form a ring, and a ring of first load layers are surrounded by all the circles of the first foils which are not connected with the bottom layer fixing ring. The second foils are uniformly arranged at intervals along the circumferential direction of the bearing shell and are wound to form a ring, and a ring of second load layers are formed in all the second foils in a surrounding mode and are parallel to the edge of the bottom layer fixing ring. And the third foils are uniformly arranged at intervals along the circumferential direction of the bearing shell and are wound to form a ring, and the upper bottoms of all the third foils enclose a ring of third load layer. The first load layer, the second load layer and the third load layer are sequentially arranged at intervals along the direction far away from the circle center of the bearing shell. In order to meet the operation requirements of different loads, the rigidity of the first foil, the second foil and the third foil is sequentially increased, so that the load bearing capacity of the first load layer is smaller than that of the second load layer, and the load bearing capacity of the second load layer is smaller than that of the third load layer. Meanwhile, according to the deformation capacities of the first foil, the second foil and the third foil and the operation requirement of the load to be borne, the number of the first foils is larger than that of the second foils, and the number of the second foils is larger than that of the third foils. In this embodiment, the ratio of the number of the first, second and third foils is 4:2:1 and each third foil and each second foil is arranged between two first foils.

Furthermore, the material of bottom retainer plate is equipped with a plurality of recesses for flexible material and bottom retainer plate and bearing housing laminating's outer lane, and these a plurality of recesses set up along bearing housing's circumference, therefore the bottom retainer plate also can produce certain deformation power bearing load at the in-process of equipment operation.

Specifically, in this embodiment, the first foil is made of rubber, the second foil is made of steel, and the third foil is made of composite metal. In other embodiments, the specific shape and number of the first, second and third foils may be varied, as long as the hierarchical composite structure design is satisfied. Meanwhile, in this embodiment, the shapes of the first, second and third foils may be the shapes of the cross sections of the first, second and third foils, or may be the actual three-dimensional structures of the first, second and third foils. If the double-circle structure of the first foil is an actual three-dimensional structure, the rows of the first foil are sequentially arranged along the axial direction of the bearing housing, and similarly, the rows of the second foil and the third foil are sequentially arranged along the axial direction of the bearing housing.

It can be seen that when the load of the device is light, the first load layer formed by the first foil can meet the operation requirement of the load. If the load of the equipment is increased in the operation process, the first load layer cannot meet the operation requirement of the increased load, the first load layer deforms and extrudes the second load layer formed by the second foil, the first load layer transmits the load value to the second load layer through deformation, and in the operation process, the second load layer and the first load layer bear the load together. Similarly, if the load of the equipment is increased continuously, the first load layer and the second load layer cannot meet the operation requirement of the equipment, at the moment, the second load layer deforms and extrudes the third load layer formed by the third foil, the second load layer transmits the load value to the third load layer through deformation, and in the later operation process, the third load layer, the second load layer and the first load layer bear the load together. Meanwhile, when the third load layer deforms to bear the load, the bottom fixing ring can also deform to bear the load together.

Therefore, the utility model provides an air supporting bearing has formed the hierarchical formula load structure who bears the load through first foil, second foil and third foil, and wherein first foil forms first load layer and can bear the light-duty load, and the second load layer that the second foil formed can bear the medium-duty load, and the third load layer that the third foil formed can bear the heavy-duty load, satisfies the operation demand of different loads, has effectively improved air supporting bearing's damping rigidity.

The utility model discloses still provide an equipment, this equipment includes the air supporting bearing that the above-mentioned proposed, and specific this equipment can be compressor, turbo charger need realize pivoted equipment.

It is noted that the terminology used above is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. 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. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present application, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the case of not making a reverse description, these directional terms do not indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the scope of the present application; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

For ease of description, spatially relative terms such as "over … …", "over … …", "over … …", "over", etc. may be used herein to describe the spatial positional relationship of one device or feature to another device or feature as shown in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of protection of the present application is not to be construed as being limited.

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. Air supporting bearing, including the bearing housing, set gradually inboard ripples foil and the top foil of bearing housing, its characterized in that, ripples foil includes a plurality of along the first foil piece that the circumference of bearing housing set up at interval in proper order, a plurality of along the second foil piece that the circumference of bearing housing set up at interval in proper order, a plurality of along the third foil piece that the circumference of bearing housing set up at interval in proper order, first foil piece the second foil piece with the third foil piece is in the radial ascending height of bearing housing reduces in proper order, first foil piece the second foil piece with the rigidity of third foil piece increases in proper order.

2. The air bearing of claim 1, wherein the number of the first foil, the second foil, and the third foil decreases sequentially.

3. The air bearing of claim 1, further comprising a bottom stationary ring, wherein the first foil, the second foil, and the third foil are secured to an inner ring of the bottom stationary ring, and an outer ring of the bottom stationary ring is attached to the bearing housing.

4. The air bearing as claimed in claim 3, wherein the bottom retainer ring has a plurality of grooves formed in an outer ring thereof along a circumferential direction, and the bottom retainer ring is made of a flexible material.

5. The air bearing as recited in claim 3, wherein the first foil comprises two circles connected side by side, any one of the circles being fixed to the bottom retainer ring, centers of the two circles and a center of the bearing housing passing through a same straight line.

6. The air bearing of claim 3, wherein said second foil has a regular hexagonal shape, said second foil having a first inner angle and a second inner angle, said first inner angle being greater than said second inner angle, and wherein said edges of said second foil that are connected to said bottom retainer ring correspond to two of said second inner angles.

7. The air bearing of claim 3, wherein the third foil has a trapezoidal shape, and a lower bottom of the third foil is connected to the bottom retainer ring.

8. The air bearing of claim 1, wherein the first foil is rubber, the second foil is steel, and the third foil is a composite metal.

9. The air bearing of claim 2, wherein each of the second foils is disposed between two of the first foils and each of the third foils is disposed between two of the first foils.

10. An apparatus comprising an air bearing as claimed in any one of claims 1 to 9.