CN216241814U

CN216241814U - Integrated gas bearing structure

Info

Publication number: CN216241814U
Application number: CN202122964117.XU
Authority: CN
Inventors: 李素丽; 张喜辰; 卢秉恒
Original assignee: National Institute Corp of Additive Manufacturing Xian
Current assignee: National Institute Corp of Additive Manufacturing Xian
Priority date: 2021-11-29
Filing date: 2021-11-29
Publication date: 2022-04-08
Anticipated expiration: 2031-11-29

Abstract

The utility model provides an integrated gas bearing structure, which is manufactured by directly forming a bearing sleeve and a bearing which are integrally assembled in one step through a traditional processing method or a 3D printing method, has small subsequent processing amount, obviously improves the processing efficiency while ensuring the processing precision, and can select different metal materials according to the working environment of the required gas bearing. The bearing is provided with the inlet port on the bearing cover, be provided with a plurality of breather pipes along bearing border to bearing center department on the bearing, inside gas passed through the inlet port and gets into the bearing through breather pipe along air cavity passageway circulation flow, inside the effectual bearing of carrying gas, reduce the inside work heat of bearing, inside more stable than solid bearing product quality of bearing, the heat affected zone is little, thermal deformation resistance ability is stronger, and this structure compares with traditional bearing structure and has reduced the processing cost, use the reliability height, has wide application prospect.

Description

Integrated gas bearing structure

Technical Field

The utility model relates to the technical field of bearings, in particular to an integrated gas bearing structure.

Background

The air bearing mainly uses gas as a lubricant, and the gas as the lubricant has the advantages of small friction torque and friction coefficient, and the advantages of no pollution to the use environment and the required use part. Meanwhile, compared with a rolling bearing and an oil sliding bearing, the air bearing has the advantages of high movement speed, good accuracy, low power, short service life and the like, and is an ideal supporting part.

The gas bearing mainly uses gas as a lubricant, and the gas as the lubricant has the advantages of small friction torque and friction coefficient, and the advantages of no pollution to the use environment and the required use part. Meanwhile, compared with a rolling bearing and an oil sliding bearing, the gas bearing has the advantages of high movement speed, good accuracy, low power, short service life and the like, and is an ideal supporting part. Most of the mainstream gas bearings in the market today are elastic foil gas bearings, and the structure of the gas bearing comprises a top foil and a supporting foil, wherein a bearing sleeve is installed in the bearing sleeve and used for forming a gas film gap with a rotor, and the supporting foil is supported between the bearing sleeve and the top foil. In a typical elastic foil gas bearing, the bearing bush is fixed and cannot be adjusted in a self-adaptive manner, so that the bearing is difficult to adapt to the working condition of a large load. Meanwhile, when the elastic foil gas bearing works normally, the free end area of the top foil cannot be influenced by axial vibration of a shaft system, the top foil is easy to dislocate along the axial direction, the effective working gas film in the bearing area is unevenly distributed, and the bearing capacity and stability of the foil dynamic pressure air bearing are reduced. Most importantly, the elastic foil gas bearing is complicated in both the traditional processing procedure and the 3D printing manufacturing procedure, so that the manufacturing cost is always high.

SUMMERY OF THE UTILITY MODEL

The utility model provides an integrated gas bearing structure, aiming at the problems that an elastic foil gas bearing in the prior art cannot be adjusted in a self-adaptive manner and is difficult to adapt to the working condition of larger load.

The utility model is realized by the following technical scheme:

an integrated gas bearing structure comprises a bearing sleeve and a bearing which are integrally assembled, wherein an air inlet is formed in the bearing sleeve, a plurality of air ducts are arranged from the edge of the bearing to the center of the bearing on the bearing, an air inlet is formed in one side, close to the edge of the bearing, of each air duct, an air outlet is formed in one side, close to the center of the bearing, of each air duct, and an air cavity channel is formed between the bearing sleeve and the bearing in the circumferential direction; and the gas circularly flows along the air cavity channel through the air inlet hole and enters the inside of the bearing through the vent pipeline.

Preferably, the bearing sleeve is seamlessly connected with two side surfaces of the bearing.

Preferably, the body of the vent conduit is of a hexagonal vent body structure.

Preferably, the plurality of air ducts are distributed on the bearing along the circumferential direction, and the air outlets face to the center of the bearing.

Preferably, the vent conduit tapers in tubular body diameter in the direction from the inlet to the outlet.

Preferably, the diameter of the inlet port is greater than the diameter of the outlet port.

Preferably, a honeycomb structure is arranged between the vent pipeline and the vent pipeline on the bearing.

Furthermore, the honeycomb structure is formed by a plurality of reinforcing ribs which are separated and supported.

Furthermore, circular walls are respectively arranged on two side surfaces from the honeycomb structure to the bearing.

Preferably, the air inlet hole of the bearing sleeve is used for air delivery through a side injection type.

Compared with the prior art, the utility model has the following beneficial technical effects:

the utility model provides an integrated gas bearing structure, which is manufactured by directly forming a bearing sleeve and a bearing which are integrally assembled in one step through a traditional processing method or a 3D printing method. The bearing sleeve is provided with the air inlet hole, the bearing is provided with the plurality of air ducts from the edge of the bearing to the center of the bearing, air circularly flows along the air cavity channel through the air inlet hole and enters the bearing through the air ducts, the air is effectively conveyed into the bearing, and the working heat in the bearing is reduced.

Furthermore, the bearing sleeve is seamlessly connected with two side faces of the bearing, so that a circle of hollow air cavity channel is formed between the bearing sleeve and the bearing, and the solid part connected between the bearing sleeve and the bearing plays a role in supporting the air cavity and preventing air from leaking out before an air film is formed.

Further, the body of breather pipe is hexagon breather pipe body structure, and hexagon breather pipe can make gas change in between getting into the bearing inside and the rotor to the effectual production that restraines the gas vortex of ability idol makes gas bearing's dynamic pressure effect more obvious, and then forms the air film more easily between bearing and rotor.

Furthermore, a plurality of air ducts are arranged and distributed on the bearing along the circumferential direction, and air outlets face to the center of the bearing, so that air can uniformly enter the bearing.

Furthermore, the inner diameter of the pipeline body is gradually reduced along the direction from the air inlet to the air outlet, so that the gas can be effectively prevented from forming turbulent flow in the ventilating pipeline, and unnecessary energy loss is caused by additional shear stress generated by the turbulent flow during the operation of the bearing.

Furthermore, when the gas bearing rotates at a high speed, due to the action of centrifugal force, part of gas forming the gas film flows back to the gas inlet from the gas outlet under the action of the centrifugal force, the diameter of the gas inlet is larger than that of the gas outlet, the vortex phenomenon is effectively avoided, and the time for forming the complete gas film is shortened.

Furthermore, a honeycomb structure is arranged between the vent pipeline and the vent pipeline on the bearing, so that the weight of the bearing is favorably reduced, and the bearing can form an air film to work under the condition of low air supply pressure.

Furthermore, the honeycomb structure is formed by separating and supporting the plurality of reinforcing ribs, the plurality of reinforcing ribs can support the bearing in all directions, the bearing can improve bearing capacity to a certain extent, the strength requirement of the bearing is guaranteed, the bearing is suitable for low air supply pressure and high air supply pressure, can be suitable for a wide air supply pressure range, and can achieve a wider application range.

Furthermore, whether the bearing operates abnormally is often checked by the heating condition of the bearing under the normal working condition of the bearing, and the fact that the phenomenon that the heat transfer is uneven on the surface of the bearing is caused to cause that the uncertain factor is too large is considered in consideration of the fact that the designed honeycomb structure can cause the phenomenon that the heat transfer is uneven, so that circular walls are respectively arranged on two side surfaces of the honeycomb structure to the bearing, the bearing is guaranteed not to cause the phenomenon that the heat transfer is not uneven on the outer surface of the bearing due to the hollow part of the honeycomb structure, and the bearing is higher in practicability.

Furthermore, the air inlet hole of the bearing sleeve is used for air transmission through a side spraying type, and the air transmission is effectively carried out on the bearing.

Drawings

FIG. 1 is a schematic view of an integrated gas bearing according to the present invention;

FIG. 2 is a schematic view of a bearing housing according to the present invention;

FIG. 3 is a schematic view of a bearing structure according to the present invention;

FIG. 4 is a schematic cross-sectional view of the integrated gas bearing structure of the present invention;

FIG. 5 is a schematic cross-sectional view of a bearing structure according to the present invention;

FIG. 6 is a schematic view of the vent line of the present invention;

FIG. 7 is a schematic view of a honeycomb structure in the bearing structure of the present invention.

In the figure: 1-a bearing sleeve; 2-air inlet holes; 3-air cavity channel; 4-an air duct; 5-a honeycomb structure; 6-an air inlet; 7-air outlet; 8-reinforcing ribs; 9-bearing.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the utility model described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

The utility model is described in further detail below with reference to the accompanying drawings:

referring to fig. 1, 2 and 3, in an embodiment of the present invention, an integrated gas bearing structure is provided, which has a simple structure, and the gas bearing can ensure that a uniform gas film can be generated during operation, so as to effectively improve the bearing capacity and stability of the bearing during operation, effectively reduce the stress strain deformation of the gas bearing during operation, and is lower in cost and easier to produce.

It should be noted that the gas bearing is an integral bearing, so that the parts are connected together as a whole, and here and in the following figures are also for better understanding of the split, the bearing does not involve assembly.

Specifically, as shown in fig. 4 and 5, the integrated gas bearing structure includes a bearing housing 1 and a bearing 9 which are integrally assembled, an air inlet 2 is arranged on the bearing housing 1, a plurality of air ducts 4 are arranged on the bearing 9 from the edge of the bearing to the center of the bearing, an air inlet 6 is arranged on one side of each air duct 4 close to the edge of the bearing, an air outlet 7 is arranged on one side of each air duct 4 close to the center of the bearing, and an air cavity channel 3 is arranged between the bearing housing 1 and the bearing 9 along the circumferential direction; the gas circulates along the gas chamber channel 3 through the gas inlet 2 through the vent duct 4 into the interior of the bearing.

Specifically, the bearing sleeve 1 and the two side surfaces of the bearing 9 are arranged in a seamless connection mode, so that a circle of hollow air cavity channel 3 is formed between the bearing sleeve 1 and the bearing 9, and the solid part connected between the bearing sleeve 1 and the bearing 9 plays a role in supporting an air cavity and preventing air from leaking out before an air film is formed.

Specifically, as shown in fig. 6, the pipe body of the vent pipe 4 is a hexagonal vent pipe body structure, and the hexagonal vent pipe can make gas more easily enter between the inside of the bearing and the rotor, and can effectively inhibit the generation of gas vortex, so that the dynamic pressure effect of the gas bearing is more obvious, and further a gas film is more easily formed between the bearing and the rotor.

Specifically, the plurality of air ducts 4 are arranged and distributed on the bearing 9 along the circumferential direction, and the air outlets 7 are all towards the center of the bearing 9, so that air can uniformly enter the inside of the bearing.

Specifically, the inner diameter of the pipeline body of the vent pipeline 4 is gradually reduced along the direction from the air inlet 6 to the air outlet 7, so that the gas can be effectively prevented from forming turbulent flow in the vent pipeline, and unnecessary energy loss is caused by additional shear stress generated by the turbulent flow during the operation of the bearing.

When the gas bearing rotates at a high speed, due to the action of centrifugal force, part of gas forming the gas film flows back to the gas inlet from the gas outlet under the action of the centrifugal force, the diameter of the gas inlet 6 is larger than that of the gas outlet 7, the vortex phenomenon is effectively avoided, and the time for forming the complete gas film is shortened.

Specifically, as shown in fig. 7, the honeycomb structure 5 is provided between the air duct 4 and the air duct 4 on the bearing 9. The structure is beneficial to reducing the weight of the bearing, so that the bearing can form an air film to work under the condition of low air supply pressure,

the honeycomb structure 5 is formed by separating and supporting a plurality of reinforcing ribs, plays a supporting role in all directions of the bearing, achieves the effect of improving bearing capacity to a certain degree, ensures the strength requirement of the bearing, is suitable for low air supply pressure and high air supply pressure, can be suitable for a wide air supply pressure range, and achieves a wider application range.

In addition, whether the bearing operates abnormally is often checked by the heating condition of the bearing under the normal working condition of the bearing, and the circular walls are respectively arranged on two side surfaces of the honeycomb structure 5 to the bearing 9 to ensure that the bearing cannot cause the phenomenon of non-uniform heat transfer on the outer surface of the bearing due to the hollow part of the honeycomb structure 5 in consideration of the fact that the phenomenon of non-uniform heat transfer on the surface of the bearing is caused by the fact that the designed honeycomb structure 5 causes the phenomenon of too large uncertain factors of detection, so that the bearing is higher in practicability.

According to the utility model, the air inlet 2 on the bearing sleeve 1 enters the air cavity channel 3, the internal air cavity and the total air inlet fully ensure that gas can effectively enter the bearing 9, and circularly flow for a circle outside the bearing, so that the condition that the gas is concentrated at one side in the bearing to press the bearing, and the stress concentration at one part of the bearing is caused, and the bearing is irregularly deformed is reduced.

The middle section of the gas bearing adopts a honeycomb structure, the structure can effectively reduce the self weight and can more easily form a gas film, and three ribs in each area can support the bearing axially and radially, so that the gas bearing cannot generate huge strain due to high-speed rotation in a rotating working state.

The bearing is simple in structure and integrated, the bearing can be formed at one time under any processing conditions, the processing difficulty of the bearing is reduced while the processing precision is guaranteed, the corresponding manufacturing cost of the gas bearing is further reduced, the use cost is lower, the assembly link is omitted in the subsequent processing of the bearing compared with other gas bearings, and the production efficiency is greatly improved.

When the gas bearing rotates, gas enters from the gas inlet 2 and circulates around the bearing through the gas cavity channel 3, so that the gas inside the gas bearing is uniformly pressurized, the phenomenon that the bearing is stressed unevenly, the bearing 9 is seriously deviated, and the bearing 9 and a rotating shaft are rubbed to cause abrasion is avoided. The air flows out through the air duct 4 while surrounding the air cavity channel 3, and enters between the bearing and the rotating shaft to form an air film.

Because the rotating speed of the working environment required by the gas bearing is generally higher and simultaneously can be accompanied by great gas supply pressure, the vent pipeline 4 is designed to have a certain arc track, so that the situation that gas impacts the vent pipeline for a long time to cause internal damage of the gas bearing can be reduced under high gas supply pressure, and meanwhile, the bearing capacity of the bearing can be properly increased by adopting the hexagonal structures of the gas inlet 6 and the gas outlet 7.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the utility model without departing from the spirit and scope of the utility model, which is to be covered by the claims.

Claims

1. An integrated gas bearing structure is characterized by comprising a bearing sleeve (1) and a bearing (9) which are assembled in an integrated manner, wherein an air inlet (2) is formed in the bearing sleeve (1), a plurality of air ducts (4) are formed in the bearing (9) from the edge of the bearing to the center of the bearing, an air inlet (6) is formed in one side, close to the edge of the bearing, of each air duct (4), an air outlet (7) is formed in one side, close to the center of the bearing, of each air duct (4), and an air cavity channel (3) is formed between the bearing sleeve (1) and the bearing (9) in the circumferential direction; the air circularly flows along the air cavity channel (3) through the air inlet holes (2) and enters the inside of the bearing through the vent pipeline (4).

2. An integrated gas bearing structure according to claim 1, characterized in that the bearing housing (1) is arranged in seamless connection with both sides of the bearing (9).

3. An integrated gas bearing structure according to claim 1, characterized in that the body of the breather conduit (4) is a hexagonal breather body structure.

4. An integrated gas bearing structure according to claim 1, characterized in that the plurality of air ducts (4) are arranged circumferentially around the bearing (9) and the air outlets (7) are directed towards the center of the bearing (9).

5. An integrated gas bearing structure according to claim 1, characterized in that the vent duct (4) has a decreasing internal diameter in the direction from the gas inlet (6) to the gas outlet (7).

6. An integrated gas bearing structure according to claim 1, characterized in that the diameter of the gas inlet (6) is larger than the diameter of the gas outlet (7).

7. An integrated gas bearing structure according to claim 1, characterized in that a honeycomb structure (5) is arranged between the venting duct (4) and the venting duct (4) on the bearing (9).

8. An integrated gas bearing structure according to claim 7, characterized in that the honeycomb structure (5) is formed by a number of reinforcing ribs separated by supports.

9. An integrated gas bearing structure according to claim 7, characterized in that the honeycomb structure (5) to the bearing (9) is provided with circular walls on both sides, respectively.

10. An integrated gas bearing structure according to claim 1, characterized in that the gas inlet holes (2) of the bearing housing (1) are supplied by a side injection.