CN216666222U

CN216666222U - Split type foil thrust gas bearing

Info

Publication number: CN216666222U
Application number: CN202220275361.7U
Authority: CN
Inventors: 常海兵; 甘露
Original assignee: Cssc Southwest Equipment Research Institute Co ltd
Current assignee: Cssc Southwest Equipment Research Institute Co ltd
Priority date: 2022-02-11
Filing date: 2022-02-11
Publication date: 2022-06-03
Anticipated expiration: 2032-02-11

Abstract

The utility model relates to a split type foil type thrust gas bearing, which comprises a bottom foil, a gasket and a top foil; the bottom foil comprises a bottom fixing ring, a bottom fixing structure, a bottom connecting structure and an arched foil; the gasket comprises a gasket fixing ring and gasket strips distributed along the radial direction; the top layer foil comprises a top layer fixing ring, a top layer fixing structure, a top layer connecting structure and an air channel; the top foil is of a multi-lobe uniform fan-shaped structure, and the number of lobes of the bottom foil, the spacer and the top foil is the same; the gasket is characterized by further comprising an end cover, wherein the bottom foil, the gasket and the top foil are sequentially fixed on the end cover. The thrust gas bearing has the advantages that the bearing capacity and the impact and vibration resisting capacity of the thrust gas bearing can be effectively improved, the difficulty in replacing the bearing is simplified, and the whole scrapped resource waste of the bearing is reduced.

Description

Split type foil thrust gas bearing

Technical Field

The utility model relates to the technical field of dynamic pressure gas bearings, in particular to a split type foil type thrust gas bearing.

Background

The thrust gas bearing is a dynamic pressure gas bearing, the gas involved in the wedge-shaped gap is compressed by utilizing the wedge effect, and the gas film pressure of the compressed gas generates effective bearing, so that the bearing of the thrust gas bearing can be ensured to offset the axial force of a rotor system, and the equipment can run stably. Compared with the traditional bearing, the thrust gas bearing has obvious advantages, and the advantages of high rotating speed, long service life, oil-free lubrication, high temperature resistance and the like enable the thrust gas bearing to be widely applied to rotating machinery such as hydrogen fuel cell air compressors, air suspension blowers, air cycle machines, micro gas turbines and the like.

The structure of the existing foil type thrust gas bearing is divided into a bearing seat, a bottom foil and a top foil from bottom to top, wherein the bottom foil and the top foil are in 6-petal or 8-petal structural forms. The existing foil thrust gas bearing adopts a welding mode, firstly, the fixed end of a bottom foil is welded to the corresponding position of a bearing seat in sequence, and then, each piece of top foil is welded above each piece of bottom foil in sequence. The existing technology is complex in processing technology, a plurality of pieces of bottom foil and top foil need to be welded, in addition, the top foil and the top foil are difficult to be uniformly distributed in positioning during welding, the foils deform due to welding, and finally the consistency of the bottom foil and the top foil on the welded thrust bearing is poor. Because the height of the multi-lobe top foil is finally inconsistent due to the accumulation of the deviation of the welding positions of the bottom foil or the top foil, the performance of the thrust bearing is directly influenced, and the effective bearing capacity and the shock and vibration resistance of the bearing are reduced in the actual use process. Another problem that prior art exists is that thrust gas bearing formula structure as an organic whole, when appearing bearing some lamella bottom foil and damaging, can only scrap thrust bearing wholly, can't only change the bottom foil and improve resource utilization.

SUMMERY OF THE UTILITY MODEL

To the not enough of above-mentioned prior art, the technical problem that this patent application will be solved provides one kind and can effectively improve thrust gas bearing's bearing capacity and shock-resistant vibration ability, simplifies the degree of difficulty of changing the bearing, reduces the whole condemned split type foil type thrust gas bearing of wasting of resources of bearing.

In order to solve the technical problems, the utility model adopts the following technical scheme:

a split foil type thrust gas bearing comprises a bottom foil, a gasket and a top foil; the bottom foil comprises a bottom fixing ring, a bottom fixing structure, a bottom connecting structure and an arched foil; the gasket comprises a gasket fixing ring and gasket strips distributed along the radial direction; the top layer foil comprises a top layer fixing ring, a top layer fixing structure, a top layer connecting structure and an air channel; the top foil is of a multi-lobe uniform fan-shaped structure, and the number of lobes of the bottom foil, the spacer and the top foil is the same; the gasket is characterized by further comprising an end cover, wherein the bottom foil, the gasket and the top foil are sequentially fixed on the end cover.

Wherein the filler strip is located in a groove between two domes of the dome foil.

Wherein the length of the backing strip in the radial direction is the same as the length of the bottom foil in the radial direction.

Wherein the surface of the top foil is uniformly coated with the antifriction wear-resistant coating.

Wherein the number of lobes of the bottom foil, the spacer and the top foil is 4 and more.

The end cover is provided with a fixing hole, the outer side of the bottom fixing ring is provided with bottom bolt fixing holes in a distributed mode, the outer side of the gasket fixing ring is provided with gasket fixing holes in a distributed mode, the outer side of the top fixing ring is provided with top bolt fixing holes in a distributed mode, and the top bolt fixing holes, the gasket fixing holes, the bottom bolt fixing holes and the fixing holes are connected in sequence through bolts.

In conclusion, the utility model effectively simplifies the processing and assembling process of the thrust bearing and simultaneously improves the processing quality of the thrust gas bearing. The thrust gas bearing provided by the utility model has more excellent performance, higher bearing capacity and higher shock and vibration resistance. In addition, the split thrust gas bearing structure provided by the utility model can effectively simplify the difficulty of replacing the bearing and reduce the integral rejection rate of the bearing.

Drawings

Fig. 1 is a schematic view of an end cap of a split foil thrust gas bearing according to the present invention.

Fig. 2 is a schematic view of a split foil thrust gas bearing according to the present invention.

Fig. 3 is a schematic view of the top foil of fig. 2.

Fig. 4 is a schematic view of the gasket of fig. 2.

FIG. 5 is a schematic view of the back-sheet of FIG. 2.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings. In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the orientation words such as "upper, lower" and "top, bottom", etc. is generally based on the orientation or positional relationship shown in the drawings for the convenience of description of the present invention and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

As shown in fig. 1 to 5, a split foil thrust gas bearing includes a bottom foil 1, a spacer 2 and a top foil 3, and when the thrust gas bearing is mounted on a device, the thrust gas bearing needs to be fixed on an end cover 4; the bottom foil comprises a bottom fixing ring 11, a bottom fixing structure 13, a bottom connecting structure 14 and an arched foil 15; the gasket comprises a gasket fixing ring 21 and gasket strips 23 distributed along the radial direction; the top layer foil comprises a top layer fixing ring 31, a top layer fixing structure 33, a top layer connecting structure 34 and an air passage 35; the top foil is of a multi-lobe uniform fan-shaped structure, and the number of lobes of the bottom foil, the spacer and the top foil is the same; the packaging structure further comprises an end cover 4, wherein the bottom foil, the gasket and the top foil are sequentially fixed on the end cover.

In this embodiment, the filler strip is located in a groove between two domes of the dome-shaped foil.

In this embodiment, the length of the backing strip in the radial direction is the same as the length of the bottom foil in the radial direction, and the length of the backing strip tends to be different according to the length of the bottom foil in the radial direction.

In this embodiment, the surface of the top foil is uniformly coated with a wear-reducing and wear-resisting coating to improve the service life of the thrust bearing and the rotor system.

In this embodiment, the number of lobes of the bottom foil, the spacer, and the top foil is 4 or more. And is not limited to 6 or 8 lobes.

In this embodiment, be provided with fixed orifices 41 on the end cover, the outside of bottom retainer plate distributes and is provided with bottom bolt fixed orifices 12, the outside of gasket retainer plate distributes and is provided with gasket fixed orifices 22, the outside of top layer retainer plate distributes and is provided with top layer bolt fixed orifices 32, utilizes the bolt to connect top layer bolt fixed orifices, gasket fixed orifices, bottom bolt fixed orifices and fixed orifices in proper order.

Compared with the prior art, the foil type thrust gas bearing provided by the utility model does not need a bearing seat, does not need to be assembled after the bottom foil and the top foil are sequentially welded on the bearing seat, and only needs to sequentially assemble the bottom foil, the gasket and the top foil which are all in an integrated structure on equipment. Because bottom foil, gasket and top foil are the integral type structure, can directly obtain the structure of design through the wire-electrode cutting in the course of working, consequently can need not to carry out welding process to multilobe bottom foil and top foil, only need install the bottom foil, gasket and the top foil of integral type on the end cover in proper order to it can to fix 3 integral type structures's retainer plate department tightly through the bolt. Therefore, the processing process is simplified, the problem of foil deformation caused by repeated welding is avoided, and the processing quality of the thrust gas bearing is guaranteed. The thrust gas bearing top foil provided by the utility model has high consistency of height, and when the thrust gas bearing top foil is used in an actual working condition, the multi-lobe top foil simultaneously contacts with the rotating equipment for bearing, so that the bearing capacity of the thrust gas bearing and the stability of the equipment in the axial direction during operation are improved. The gasket strips uniformly distributed on the gasket of the intermediate structure of the foil type thrust gas bearing can effectively share the load transferred by the top foil for the bottom foil, improve the coulomb friction force between the bottom foil and the top foil, and improve the shock and vibration resistance of the bearing while improving the load of the bearing. In addition, because the thrust gas bearing provided by the utility model is of a split structure and is uniformly fixed on equipment through bolts during installation, when a certain split structure is damaged, the thrust gas bearing can be independently disassembled and replaced without scrapping the whole thrust gas bearing, so that the utilization rate of resources is improved, and the yield of bearing samples is objectively improved.

The specific assembling process of the foil thrust gas bearing comprises the following steps:

1. firstly, placing an end cover of a thrust gas bearing to be installed on a flat surface, flatly placing the end cover, and then sequentially laying a bottom foil, a gasket and a top foil of the thrust gas bearing on the installation position of the end cover;

2. after the bottom foil is laid on the mounting position, rotating the position of the bottom foil to align the bottom bolt fixing hole on the bottom fixing ring with the fixing hole on the end cover; then, overlapping the gasket fixing ring of the gasket with the bottom layer fixing ring and then laying the gasket above the bottom layer foil, wherein gasket strips distributed along the radial direction and having different lengths are all arranged in grooves of adjacent arched structures of the bottom layer foil, and the length of the gasket strips along the radial direction at the same position is equal to that of the bottom layer foil along the radial direction; finally, the top layer fixing ring of the top layer foil is overlapped with the gasket fixing ring and then is laid above the gasket, and each sector structure of the top layer foil completely covers the corresponding arch structure of the bottom layer foil;

3. the split bottom foil, the gasket and the top foil are uniformly fixed on the fixing holes of the end cover through bolts.

When a certain part in the split structure is damaged, the bolt can be disassembled, and the damaged part in the thrust gas bearing can be replaced without scrapping the whole thrust gas bearing.

Finally, it should be noted that: various modifications and alterations of this invention may be made by those skilled in the art without departing from the spirit and scope of this invention. Thus, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

Claims

1. A split foil thrust gas bearing is characterized by comprising a bottom foil, a gasket and a top foil;

the bottom foil comprises a bottom fixing ring, a bottom fixing structure, a bottom connecting structure and an arched foil;

the gasket comprises a gasket fixing ring and gasket strips distributed along the radial direction;

the top layer foil comprises a top layer fixing ring, a top layer fixing structure, a top layer connecting structure and an air channel;

the top foil is of a multi-lobe uniform fan-shaped structure, and the number of lobes of the bottom foil, the spacer and the top foil is the same;

the gasket is characterized by further comprising an end cover, wherein the bottom foil, the gasket and the top foil are sequentially fixed on the end cover.

2. The split foil thrust gas bearing of claim 1, wherein said shim bars are located in a groove between two domes of a dome foil.

3. The split foil thrust gas bearing of claim 2, wherein the shim strips have the same length in the radial direction as the underlying foil.

4. The split foil thrust gas bearing of claim 3, wherein a surface of the top foil is uniformly coated with a wear reducing and wear resistant coating.

5. The split foil thrust gas bearing of claim 1, wherein said bottom, shim and top foils have a lobe count of 4 lobes or more.

6. The split foil thrust gas bearing of claim 1, wherein the end cap has fixing holes, bottom bolt fixing holes are distributed on the outer side of the bottom fixing ring, gasket fixing holes are distributed on the outer side of the gasket fixing ring, top bolt fixing holes are distributed on the outer side of the top fixing ring, and the top bolt fixing holes, the gasket fixing holes, the bottom bolt fixing holes and the fixing holes are connected in sequence by bolts.