CN215634378U

CN215634378U - Foil assembly, bearing assembly and foil hydrodynamic gas radial bearing

Info

Publication number: CN215634378U
Application number: CN202120447761.7U
Authority: CN
Inventors: 彭学院; 史婷; 李佐良; 陈钦隆; 冯健美
Original assignee: Sichuan Dachuan Compressor Co ltd; Xian Jiaotong University
Current assignee: Sichuan Dachuan Compressor Co ltd; Xian Jiaotong University
Priority date: 2021-03-02
Filing date: 2021-03-02
Publication date: 2022-01-25
Anticipated expiration: 2031-03-02

Abstract

The application belongs to the field of gas bearings, and particularly relates to a foil assembly, a bearing assembly and a foil dynamical pressure gas radial bearing. The gas foil bearing in the existing air compressor system for the hydrogen fuel cell automobile is seriously worn in starting and stopping, low in impact resistance at high rotating speed and poor in system stability. The application provides a hydrodynamic gas radial bearing, which comprises a foil assembly and a bearing assembly which are sequentially arranged from inside to outside, wherein the foil assembly is connected with the bearing assembly; the foil assembly comprises a first foil and a second foil which are sequentially arranged from inside to outside, and a plurality of through holes are formed in the first foil; the bearing assembly comprises a plurality of elastic supporting structures and a bearing shell which are connected with each other, and inner holes are formed in the elastic supporting structures. The deformation degree is large, the damping characteristic is enhanced, the shock resistance is high, and the stability of the rotor-bearing system is good at high rotating speed.

Description

Foil assembly, bearing assembly and foil hydrodynamic gas radial bearing

Technical Field

The application belongs to the field of gas bearings, and particularly relates to a foil assembly, a bearing assembly and a foil dynamical pressure gas radial bearing.

Background

Hydrogen energy and fuel cells are considered as important components of future energy strategies and important directions of energy technology revolution all over the world, and developed countries such as the united states, japan, germany and the like have raised hydrogen energy planning to the national energy strategy height. The hydrogen energy and fuel cell technology is listed as a key task in the innovation action of the energy technology revolution in the initiative plan of the energy technology revolution (2016-2030) in China, and is also listed as a strategic task in the country in the initiative and development strategy outline of the national innovation drive.

Currently, one of the technical bottlenecks restricting the development of hydrogen energy and fuel cell vehicles is the efficient and stable operation of key auxiliary components. The centrifugal air compressor is one of the core components of the fuel cell system, is required to be clean, oil-free and efficient, and provides sufficient air for a fuel cell vehicle so as to meet the operation requirement of the fuel cell system. The gas foil bearing is a key part of a centrifugal air compressor system, has a series of advantages of small friction loss, good high-temperature stability, no need of lubrication, less auxiliary equipment, almost no maintenance and the like, and the performance of the gas foil bearing is closely related to the reliable operation of the air compressor.

Although the gas foil bearing is applied to the fuel cell automobile air compressor, the gas foil bearing is not mature, and brings a plurality of technical difficulties due to the characteristics of the gas foil bearing, so that the localization process of the air compressor is limited. In order to meet the requirements of the electric pile on air flow and pressure, the maximum rotating speed of the air compressor for the fuel cell automobile reaches about 10 thousands of revolutions, the shock resistance of a bearing-rotor system is low at high rotating speed, and the stability of a rotor shaft is poor. Currently, the current practice is. The starting and stopping times of the air compressor for the fuel cell automobile are about 10 ten thousand, and the target of 25 ten thousand starting and stopping times in 2020 year is far away from that provided by the United states energy Department (DOE). Before the rotor shaft is started, the rotor and the gas foil bearing do not move relatively, so that the rotor and the bearing are in a direct contact dry friction state during the starting of the air compressor. The air compressor is repeatedly started and stopped, so that the friction and the abrasion between the gas bearing foil and the rotor are serious, and the service life of the system is shortened. The gas foil bearing has poor stability at high speed and abrasion during start-stop, so that the air compressor vibrates at high speed, the running stability is poor, and the development of the whole hydrogen fuel cell automobile industry is seriously restricted.

SUMMERY OF THE UTILITY MODEL

1. Technical problem to be solved

Based on the problems that a gas foil bearing in an existing air compressor system for a hydrogen fuel cell automobile is seriously worn in starting and stopping, low in impact resistance under high rotating speed and poor in system stability, the application provides a foil assembly, a bearing assembly and a foil dynamical pressure gas radial bearing.

2. Technical scheme

In order to achieve the above object, the present application provides a foil assembly, which includes a first foil and a second foil sequentially arranged from inside to outside, wherein the first foil is provided with a plurality of through holes.

Another embodiment provided by the present application is: the surface of the first foil is provided with a 7-shaped through hole.

Another embodiment provided by the present application is: the first foil comprises a first connecting portion, the second foil comprises a second connecting portion, and the first connecting portion and the second connecting portion are sequentially arranged from inside to outside.

Another embodiment provided by the present application is: the outer circle surface of the first foil and the inner circle surface of the second foil are coaxial, the thickness of the first foil is 0.1-0.2 mm, the thickness of the second foil is 0.1-0.2 mm, and the foil assembly is made of a nickel-based high-temperature alloy material.

The application also provides a bearing assembly, including a plurality of elastic support structures and the bearing housing of interconnect, the last hole that is provided with of elastic support structure.

Another embodiment provided by the present application is: the hole is cylindrical through-hole, the hole cross section is circular, the elastic support structure with bearing housing structure as an organic whole, the hole with the bearing housing internal diameter is tangent.

Another embodiment provided by the present application is: the elastic support structure is 0.5-0.6 mm thick, the diameter of the inner hole is larger than 2 times of the thickness, and the bearing assembly is made of a nickel-based high-temperature alloy material.

The application also provides a hydrodynamic gas radial bearing, which comprises a foil assembly and a bearing assembly which are sequentially arranged from inside to outside, wherein the foil assembly is connected with the bearing assembly.

Another embodiment provided by the present application is: the bearing shell is provided with a foil groove along the axial direction, one end of the bearing shell along the circumferential direction is provided with a first clamp spring groove, one end of the bearing shell along the circumferential direction is provided with a second clamp spring groove, the foil assembly is connected with the bearing assembly through the foil groove, the first clamp spring groove is provided with a first clamp spring, and the second clamp spring groove is provided with a second clamp spring.

Another embodiment provided by the present application is: the elastic supporting structure is tangent to the outer circular surface of the second foil.

The application also provides an application of the dynamic pressure gas radial bearing, and the dynamic pressure gas radial bearing is applied to a high-speed oil-free air compressor system for a fuel cell automobile.

3. Advantageous effects

Compared with the prior art, the foil assembly, the bearing assembly, the dynamic pressure gas radial bearing and the application thereof have the beneficial effects that:

according to the foil assembly, the 7-shaped through hole is formed in the surface of the first foil, high-pressure airflow is formed in the through hole along with rotation of the rotating shaft at a high rotating speed, the shock resistance of a rotor-bearing system is enhanced, and the stability of the system is enhanced at the high rotating speed. Meanwhile, during start-stop, the friction wear between the foil assembly and the rotor can be reduced by the airflow in the through holes, the rotor can take off more easily, the start-stop times are increased, and the service life of the system is prolonged.

The bearing assembly provided by the application has the advantages of large deformation degree, enhanced damping characteristic, higher shock resistance and better stability of a rotor-bearing system at high rotating speed.

The dynamic pressure gas radial bearing is a foil dynamic pressure gas radial bearing, so that the friction and the abrasion of a rotor-shaft system during starting and stopping can be effectively reduced, the shock resistance of the system is enhanced, and the service life of the bearing is prolonged.

The application provides a gaseous journal bearing of dynamic pressure, before the rotor starts with pivot direct contact, under the operating condition with lubricated air film contact, the foil piece subassembly provides smooth surface for the air film.

The dynamic pressure gas radial bearing provided by the application can well solve the problems of poor stability at high speed and serious friction and abrasion during start and stop in the existing gas foil bearing.

The application of the dynamic pressure gas radial bearing provided by the application applies the dynamic pressure gas radial bearing to an air compressor system for a fuel cell automobile, the vibration is small under the high rotating speed, the impact resistance is strong, the system stability is high, the start-stop abrasion is small, and the start-stop frequency is increased.

Drawings

FIG. 1 is a schematic view of a first foil construction of the present application;

FIG. 2 is a schematic front view of a first foil of the present application;

FIG. 3 is a schematic view of a first foil via structure of the present application;

FIG. 4 is a schematic view of a second foil construction of the present application;

FIG. 5 is a schematic front view of a second foil of the present application;

FIG. 6 is a schematic view of the bearing assembly construction of the present application;

FIG. 7 is a front schematic view of a bearing assembly of the present application;

FIG. 8 is a schematic half-section view of a bearing assembly of the present application;

FIG. 9 is a schematic view of a hydrodynamic gas radial bearing configuration of the present application;

FIG. 10 is a schematic view of a partial structure of a hydrodynamic gas radial bearing according to the present application;

FIG. 11 is an exploded schematic view of the hydrodynamic gas radial bearing of the present application;

FIG. 12 is a schematic view of a first clamp spring structure of the present application;

in the figure: 1-a first foil sheet, 2-a second foil sheet, 3-a through hole, 4-an elastic support structure, 5-a bearing shell, 6-a first connecting part, 7-a second connecting part, 8-a foil sheet groove, 9-a first clamp spring groove, 10-a second clamp spring groove, 11-a first clamp spring and 12-a second clamp spring.

Detailed Description

Hereinafter, specific embodiments of the present application will be described in detail with reference to the accompanying drawings, and it will be apparent to those skilled in the art from this detailed description that the present application can be practiced. Features from different embodiments may be combined to yield new embodiments, or certain features may be substituted for certain embodiments to yield yet further preferred embodiments, without departing from the principles of the present application.

The gas foil bearing is a dynamic pressure gas bearing with a good lubricating surface, which consists of one or more layers of elastic supporting structures and a top foil, and the gas with certain viscosity is extruded by the relative motion of a rotating shaft and the surface of the bearing to form a pressure lubricating gas film so as to achieve the supporting and lubricating effects. The rotating shaft and the bearing have certain eccentricity, the lubricating gas is continuously brought into a wedge-shaped gap between the rotating shaft and the bearing along with the rotation of the rotating shaft, the lubricating gas forms a gas film until the pressure of the gas film is enough to float the rotating shaft, and at the moment, the rotating shaft is separated from the bearing and works under the support of the lubricating gas film.

Referring to fig. 1 to 12, the present application provides a foil assembly, which includes a first foil 1 and a second foil 2 sequentially arranged from inside to outside, wherein a plurality of through holes 3 are formed in the first foil 1.

The first foil 1 is here a hollowed-out top foil and the second foil 2 is a complete top foil. The circumference outer side of the hollowed-out top layer foil is in contact with the complete top layer foil, the rotor is in direct contact with the rotating shaft before starting, and the rotor is in contact with the lubricating gas film in a working state, so that a smooth surface is provided for the gas film.

Further, the surface of the first foil 1 is provided with a 7-shaped through hole 3.

As shown in fig. 3, the through holes 3 are sickle-shaped formed by combining 3 small hollow structures, which is only illustrated here, and the number and the shape of the through holes 3 can be adjusted and set according to actual requirements. The surface of the first foil 1 is provided with a 7-shaped through hole 3, and high-pressure airflow is formed in the through hole 3 along with the rotation of the rotating shaft at high rotation speed.

Further, the first foil 1 comprises a first connection portion 6, the second foil 2 comprises a second connection portion 7, and the first connection portion 6 and the second connection portion 7 are sequentially arranged from inside to outside.

As shown in fig. 1 and 4, after the first foil 1 and the second foil 2 form a foil assembly, the connection may be made by the first connection 6 and the second connection 7 and the bearing assembly.

Furthermore, the outer circle surface of the first foil 1 and the inner circle surface of the second foil 2 are coaxial, the thickness of the first foil is 0.1-0.2 mm, the thickness of the second foil is 0.1-0.2 mm, and the foil assembly is made of a nickel-based high-temperature alloy material.

The first foil 1 and the second foil 2 are only in contact with each other.

The application also provides a bearing assembly, which comprises a plurality of elastic supporting structures 4 and a bearing shell 5 which are connected with each other, wherein inner holes are arranged on the elastic supporting structures 4.

As shown in fig. 6, the elastic support structure 4 is a convex part on the bearing shell 5, the elastic support structure 4 has a round structure, the processing is convenient, the diameter of the inner hole is larger than 2 times of the convex thickness, and the special structural arrangement enhances the damping characteristic of the bearing and effectively reduces the vibration at high rotation speed.

Further, the hole is cylindrical through-hole, the hole cross section is circular, elastic support structure 4 with bearing housing 5 is structure as an organic whole, the hole with bearing housing 5 internal diameter is tangent.

Furthermore, the thickness of the elastic supporting structure 4 is 0.5-0.6 mm, the diameter of the inner hole is larger than 2 times of the thickness, and the bearing assembly is made of a nickel-based high-temperature alloy material.

The application also provides a hydrodynamic gas radial bearing, which comprises the foil assembly and the bearing assembly which are sequentially arranged from inside to outside, wherein the foil assembly is connected with the bearing assembly.

Specifically, the hollowed top foil, the complete top foil, the elastic supporting structure 3 and the bearing shell 4 are sequentially arranged from inside to outside.

Further, a foil groove 8 is axially formed in the bearing shell 5, a first clamp spring groove 9 is formed in one end of the bearing shell 5 in the circumferential direction, a second clamp spring groove 10 is formed in one end of the bearing shell 5 in the circumferential direction, the foil assembly is connected with the bearing assembly through the foil groove 8, a first clamp spring 11 is arranged on the first clamp spring groove 9, and a second clamp spring 12 is arranged on the second clamp spring groove 10.

The first connecting portion 6 on the top foil of fretwork, the second connecting portion 7 of complete top foil are put into foil groove 8, and first jump ring 11 is fixed to first jump ring groove 9, fixes the one end of foil subassembly and bearing subassembly, and second jump ring 12 is fixed to second jump ring groove 10, fixes the other end of foil subassembly and bearing subassembly, and the foil subassembly is fixed in the bearing subassembly.

The interface of the foil grooves 8 is a rectangular groove, the number of the foil grooves 8 is 2, the center difference of the two foil grooves 8 is 10 degrees, the width of the grooves is 1.0-1.5 mm, and the depth is the same as the length of the bearing shell.

As shown in fig. 7 (indicated by 10 ° added compared to fig. 7), in order to allow the top foil to have a sufficient space for extension in the circumferential direction, a 10 ° gap is empirically reserved from the beginning to the end of the top foil.

The first clamp spring 11 is an elastic clamp spring, the second clamp spring 12 is an elastic clamp spring, the elastic clamp spring has certain elasticity along the radial direction, the elastic clamp spring is placed in clamp spring grooves on two sides of the bearing shell 5, and the hollowed-out top foil and the complete top foil can be firmly fixed in the foil groove 8 so as not to move along the axial direction.

The inner diameter of the first clamp spring groove 9 is the inner diameter of the bearing shell 5, and the outer diameter is the sum of the inner diameter of the bearing shell 5 and 2-3 mm; the inner diameter of the second clamp spring groove 10 is the inner diameter of the bearing shell 5, and the outer diameter of the second clamp spring groove is the inner diameter of the bearing shell 5 plus 2-3 mm.

Further, the elastic support structure 4 is tangent to the outer circumferential surface of the second foil 2.

The oxygen of the air system of the hydrogen fuel cell automobile and the hydrogen of the hydrogen system are chemically reacted in the galvanic pile to generate electric energy. In order to control the reaction process, the galvanic pile has a certain pressure requirement on air, and simultaneously, in order to prevent the gas and the catalyst in the galvanic pile from being polluted, the air medium is required to be clean and oilless. The traditional oil lubrication bearing is easy to cause lubricating oil leakage, pollutes medium, influences hydrogen-oxygen reaction and is less in use due to the existence of the lubricating oil. Foil dynamic pressure gas journal bearing in this application adopts foil subassembly and bearing assembly, overcomes the shortcoming that part tradition has oil lubricated bearing, improves current gas bearing's weak point, effectively improves the stability of rotor shaft, reduces to open and stop the period frictional wear, increases the hydrogen fuel cell car and opens and stop the number of times.

The use process comprises the following steps: the foil dynamic pressure gas radial bearings are symmetrically arranged at two ends of the rotating shaft to play a role in radial support. The foil dynamical pressure gas radial bearing consists of a bump foil and a top foil, has a good flexible surface, and extrudes certain viscous gas to form a pressure lubricating gas film by means of relative motion of a shaft and the bearing surface (namely the top foil) so as to achieve the supporting and lubricating effects. When two surfaces which move relatively (namely the rotating shaft and the top foil) have a wedge-shaped space, the surfaces which move mutually continuously drive gas to enter the wedge-shaped groove, so that a lubricating gas film with certain pressure is formed in the wedge-shaped groove, and when the pressure of the gas film is large enough to support load feces, the floating friction force of the rotating shaft disappears. Along with the increase of the rotating speed of the rotating shaft, the pressure of the air film in the wedge-shaped gap is gradually increased.

Adopt the top layer foil of elastic support structure 3 and first foil 1 promptly fretwork in this application, when the hydrogen fuel cell car starts to stop, along with the viscidity air in the pivot screw in wedge clearance, can form the air current gathering at the through-hole 3 of the top layer foil of fretwork promptly fretwork position, and then produce high-pressure draught. The high pressure air flow acts on the surface of the rotor, so that the vibration of the bearing-rotor system is reduced, the stability is increased, and the service life of the bearing is prolonged. The hydrogen-oxygen reaction in the hydrogen fuel cell stack system generates electric energy, and air with certain flow and pressure is required to be timely delivered into the stack.

Although the present application has been described above with reference to specific embodiments, those skilled in the art will recognize that many changes may be made in the configuration and details of the present application within the principles and scope of the present application. The scope of protection of the application is determined by the appended claims, and all changes that come within the meaning and range of equivalency of the technical features are intended to be embraced therein.

Claims

1. A foil assembly, characterized by: the device comprises a first foil and a second foil which are sequentially arranged from inside to outside, wherein a plurality of through holes are formed in the first foil;

the surface of the first foil is provided with a 7-shaped through hole.

2. The foil assembly of claim 1, wherein: the first foil comprises a first connecting portion, the second foil comprises a second connecting portion, and the first connecting portion and the second connecting portion are sequentially arranged from inside to outside.

3. The foil assembly of claim 1, wherein: the outer circle surface of the first foil and the inner circle surface of the second foil are coaxial, the thickness of the first foil is 0.1-0.2 mm, the thickness of the second foil is 0.1-0.2 mm, and the foil assembly is made of a nickel-based high-temperature alloy material.

4. A bearing assembly, characterized by: the bearing comprises a plurality of elastic supporting structures and a bearing shell which are connected with each other, wherein inner holes are formed in the elastic supporting structures.

5. The bearing assembly of claim 4, wherein: the hole is cylindrical through-hole, the hole cross section is circular, the elastic support structure with bearing housing structure as an organic whole, the hole with the bearing housing internal diameter is tangent.

6. The bearing assembly of claim 4, wherein: the thickness of the elastic supporting structure is 0.5-0.6 mm, the diameter of the inner hole is larger than 2 times of the thickness of the elastic supporting structure, and the bearing assembly is made of a nickel-based high-temperature alloy material.

7. A dynamic pressure gas radial bearing, characterized in that: the foil assembly and the bearing assembly are sequentially arranged from inside to outside, and the foil assembly is connected with the bearing assembly.

8. The hydrodynamic gas radial bearing of claim 7, wherein: the bearing shell is provided with a foil groove along the axial direction, one end of the bearing shell along the circumferential direction is provided with a first clamp spring groove, one end of the bearing shell along the circumferential direction is provided with a second clamp spring groove, the foil assembly is connected with the bearing assembly through the foil groove, the first clamp spring groove is provided with a first clamp spring, and the second clamp spring groove is provided with a second clamp spring.