CN212744717U

CN212744717U - Air bearing

Info

Publication number: CN212744717U
Application number: CN202021181538.4U
Authority: CN
Inventors: 朱振武
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-06-23
Filing date: 2020-06-23
Publication date: 2021-03-19
Anticipated expiration: 2030-06-23

Abstract

An air bearing, comprising: an air injection limiting ring; the bearing outer sleeve is sleeved outside the air injection limiting ring; the annular cavity is formed by the inner wall of the bearing outer sleeve and the outer wall of the air injection limiting ring; the part of the air injection limiting ring is arranged on the air injection limiting ring, exposed out of the inner wall of the air injection limiting ring and used for abutting against the rolling part on the external rolling shaft; an air inlet arranged on the bearing outer sleeve; wherein an air injection gap is formed between the rolling part and the air injection limiting ring; the air inlet is communicated with the air injection gap through the annular cavity. The technical scheme provided by the application can greatly reduce the rolling friction coefficient of the rolling shaft, reduce the friction loss of equipment and prolong the service life of the equipment.

Description

Air bearing

Technical Field

The utility model relates to an air bearing belongs to mechanical bearing technical field.

Background

The bearing is an indispensable mechanical part of the machine during the transmission process, plays a role of fixing and reducing the load friction coefficient, is arranged on the machine and generates relative movement with other parts on a shaft, and is used for reducing the friction coefficient during the power transmission process and keeping the center position of the shaft fixed. The main function of the bearing is to support a mechanical rotating body so as to reduce the mechanical load friction coefficient of equipment in the transmission process, and the traditional bearing is mainly divided into a rolling bearing and a sliding bearing. With the requirements of production and manufacture on bearings with higher precision and smaller friction coefficient, the air bearing is inoculated.

In the prior art, the foil type air bearing is mostly adopted as the air bearing, the foil is extruded to the radial inner side by high-pressure air, the foil is directly contacted with the rolling shaft, sliding friction exists between the foil and the rolling shaft, and the foil has certain resistance to the rotation of the rolling shaft. Resulting in a less than perfect bearing.

Therefore, how to provide an air bearing, which can greatly reduce the rolling friction coefficient of a rolling shaft, reduce the friction loss of equipment, and prolong the service life of the equipment, is a technical problem to be solved by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

Not enough to above-mentioned prior art, the utility model aims to provide a can greatly reduce the rolling friction coefficient of roll axis, reduce the friction loss of equipment, prolong equipment life. The utility model provides an air bearing, this air bearing includes: an air injection limiting ring; the bearing outer sleeve is sleeved outside the air injection limiting ring; the annular cavity is formed by the inner wall of the bearing outer sleeve and the outer wall of the air injection limiting ring; the part of the air injection limiting ring is arranged on the air injection limiting ring, exposed out of the inner wall of the air injection limiting ring and used for abutting against the rolling part on the external rolling shaft; an air inlet arranged on the bearing outer sleeve; wherein an air injection gap is formed between the rolling part and the air injection limiting ring; the air inlet is communicated with the air injection gap through the annular cavity.

According to a first embodiment of the present invention, there is provided an air bearing:

an air bearing, comprising: an air injection limiting ring; the bearing outer sleeve is sleeved outside the air injection limiting ring; the annular cavity is formed by the inner wall of the bearing outer sleeve and the outer wall of the air injection limiting ring; the part of the air injection limiting ring is arranged on the air injection limiting ring, exposed out of the inner wall of the air injection limiting ring and used for abutting against the rolling part on the external rolling shaft; an air inlet arranged on the bearing outer sleeve; wherein an air injection gap is formed between the rolling part and the air injection limiting ring; the air inlet is communicated with the air injection gap through the annular cavity.

Preferably, the gas injection spacing ring comprises: an annular body; the limiting through holes are arranged on the annular body in a surrounding array mode and used for placing the rolling parts, and the through hole directions of the limiting through holes are perpendicular to the central axis of the annular body; the limiting flange is arranged at the port of one side of the limiting through hole close to the center of the annular body; the limiting flange is used for limiting the rolling part to be separated from the limiting through hole close to the port on one side of the center of the annular body.

Preferably, the air injection gap is provided between the stopper flange and the rolling portion.

Preferably, the air injection spacing ring further comprises: can dismantle the setting and be in on the cyclic annular body, and be located spacing through-hole is kept away from the stopper of cyclic annular body center side port department.

Preferably, the air injection spacing ring further comprises: the pressurizing channel is arranged on the limiting block and used for increasing the air pressure of one side, far away from the center of the air injection limiting ring, of the rolling part.

Preferably, the rolling part is any one of a sphere, an ellipsoid, a cylinder and a circular truncated cone.

According to a second embodiment of the present invention, there is provided an air bearing:

an air bearing, comprising: the bearing comprises a bearing outer sleeve, an air injection limiting ring, a rolling part and an annular cavity; the jet spacing ring comprises: the annular body, the limiting through hole and the limiting flange; the limiting through holes are arranged on the annular body in a surrounding array mode, and the through hole directions of the limiting through holes are perpendicular to the central axis of the annular body; the limiting flange is arranged at a port of the limiting through hole close to one side of the center of the annular body; the rolling part is arranged in the limiting through hole, the rolling part is exposed from the limiting flange to the center direction of the annular body, and an air injection gap is formed between the rolling part and the limiting flange; the bearing outer sleeve covers the outer side of the annular body, and the bearing outer sleeve and the outer edge of the annular body form the annular cavity; the bearing outer sleeve is provided with an air inlet, and the annular cavity is only communicated with the air inlet and the limiting through hole.

Preferably, the gas injection spacing ring comprises: a base edge; one side end surface of the annular body extends out of the edge of the base along the radial direction; the bearing housing includes: a bearing cylinder and a bearing end cover; the bearing end cover is arranged on one port (one port) of the bearing cylinder body and extends towards the axis of the bearing cylinder body; a port (one port) of the bearing cylinder body, which is far away from the bearing end cover, is hermetically arranged on the edge of the base; the bearing end cover is hermetically arranged on the end face of the other side of the annular body.

Preferably, the air injection spacing ring further comprises: a limiting block; the limiting block is positioned on the annular body and is detachably arranged, and the limiting through hole is positioned far away from a side port of the center of the annular body.

Preferably, the air injection spacing ring further comprises: a partition plate; the spacing through holes are separated by the partition plate; the limiting block is arranged on the clapboard;

preferably, the air injection spacing ring further comprises: a pressurizing passage; the pressurizing channel is arranged on the limiting block; the area of the port of the pressurizing channel close to the annular cavity is larger than that of the port close to the rolling part.

Preferably, the air inlet is provided on the bearing cylinder.

Preferably, a plurality of said air inlet arrays are provided on said bearing cylinder.

In this application, an air bearing is disclosed comprising: the bearing outer sleeve, the air injection limiting ring, the rolling part, the annular cavity and the air injection gap are arranged on the bearing outer sleeve; the bearing outer sleeve is sleeved on the outer side of the air injection limiting ring, and the inner wall of the bearing outer sleeve and the outer wall of the air injection limiting ring form an annular cavity. The annular cavity is only communicated with the air inlet and the air injection gap on the bearing outer sleeve. When the air bearing is used, the bearing outer sleeve of the air bearing is fixed, the whole air bearing is sleeved on an external rolling shaft, only the rolling part is contacted with the rolling shaft, and the rolling shaft radially extrudes the rolling part along the air bearing, so that an air injection gap between the rolling part and the air injection limiting ring has a certain width, but the space of the air injection gap is far smaller than the size of the space of one side of the rolling part, which is far away from the rolling shaft; high-pressure gas enters the annular cavity from the gas inlet, acts on the rolling part and is ejected outwards from the gas ejection gap. When the rolling shaft rotates, the rolling shaft drives the rolling part to rotate, and the space of the air injection gap is far smaller than the space of one side of the rolling part far away from the rolling shaft. Under the condition of the same air flow, the flow velocity of the air in the air injection gap is greater than the air flow velocity of the space of the rolling part far away from the rolling shaft, and under the action of pressure, the air in the space of the rolling part far away from the rolling shaft presses the rolling part to the rolling shaft, namely the rolling part of the whole air bearing is extruded to the rolling shaft along the radial direction; so that the rolling shaft and the rolling part have a firm fit relation. In an actual working state, high-pressure gas is arranged around the rolling part and basically only contacts with the rolling shaft, so that the rolling part does not have any resistance to rotation, and the rolling shaft basically does not have resistance to rotation relative to the whole air bearing. Therefore, the rolling friction coefficient of the rolling shaft can be greatly reduced, the friction loss of the equipment is reduced, and the service life of the equipment is prolonged.

In use, since static friction is generated between the rolling portion and the rolling shaft, the rolling portion has a small friction loss with respect to the surface of the rolling shaft. Thereby prolonging the service life of the rolling shaft.

In this application, be provided with spacing through-hole on the cyclic annular body of jet-propelled spacing ring. A limiting flange is arranged at one port of the limiting through hole close to the center of the annular body (the port close to the center of the annular body). The rolling part enters the limiting through hole from one end of the limiting through hole, which is far away from the center of the annular body, and abuts against the limiting flange. The clearance of rolling portion and spacing flange is the jet-propelled clearance promptly, all is provided with the rolling portion in every spacing through-hole, all has the jet-propelled clearance in every spacing through-hole. The port of the limiting through hole, which is far away from the center side of the annular body, is communicated with the annular cavity. High-pressure gas entering from the air inlet is dispersed into the limiting through holes through the annular body and is sprayed out from the air spraying gaps of the limiting through holes, namely, from the periphery of the rolling part. The existence of the air injection gap enables the rolling part to be in non-contact with the internal structure of the limiting through hole, so that the rotation of the rolling part is not influenced by friction resistance.

It should be noted that, after the rolling part rotates at a high speed, the rolling part can stably rotate in the limiting through hole due to the axial alignment of the rotating object. The stability of the whole air bearing is improved.

In this application, through the stopper, prevent that the portion that rolls from following spacing through-hole entering annular cavity when in-service use.

In this application, can improve the atmospheric pressure that the rolling portion kept away from ring dress body center opposite side through pressure boost passageway.

In the present application, the shape of the rolling part is variously selected, and the shape of the stopper flange on the stopper through-hole is also different according to the shape of the rolling part. So that the air injection gap is uniformly covered outside the exposed part of the rolling part.

In this application, between every two spacing through-holes, separate through the baffle. The limiting block is embedded in the partition board far away from the outer side of the annular body.

In this application, the port area that pressure boost passageway is close to annular cavity is greater than the port area that is close to the roll portion, and high-pressure gas further pressurizes after getting into pressure boost passageway, increases the roll portion and keeps away from the atmospheric pressure in the space of ring dress body center one side.

In this application, the even array of the annular of air inlet sets up on the bearing barrel, is favorable to making the internal high-pressure gas of annular chamber even.

In the present invention, the outer diameter (diameter) of the air bearing is 1 to 500cm, preferably 2 to 300cm, more preferably 3 to 100cm, and still more preferably 5 to 80 cm. The utility model discloses in, this bearing housing's external diameter is the same with air bearing's external diameter.

In the present invention, the width of the annular cavity (i.e. the width of the gap between the inner wall of the bearing housing and the outer wall of the air-injection spacing ring) is 0.1-500mm, preferably 1-400mm, more preferably 2-300m, and even more preferably 3-200 mm.

In the present invention, the exposed portion of the rolling portion from the inner wall of the air-jet retainer ring accounts for 1 to 50% (volume ratio), preferably 2 to 45% (volume ratio), more preferably 3 to 40% (volume ratio), and still more preferably 4 to 30% (volume ratio) of the entire rolling portion.

In the present invention, the width of the air injection gap (the maximum gap width between the rolling portion and the air injection retainer ring in any state) is 0.01 to 20mm, preferably 0.05 to 18mm, more preferably 0.08 to 15mm, and still more preferably 0.1 to 10 mm.

Compared with the prior art, the utility model discloses following beneficial effect has:

1. according to the technical scheme, the rolling friction coefficient of the air bearing can be reduced, and the mechanical loss of the air bearing is reduced;

2. according to the technical scheme provided by the application, the abrasion of the air bearing to the axial surface of the external rolling shaft can be reduced;

3. the technical scheme provided by the application can improve the use stability.

Drawings

Fig. 1 is a schematic view of an internal structure of an air bearing according to an embodiment of the present invention;

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

FIG. 3 is a schematic view of a bearing housing according to an embodiment of the present invention;

fig. 4 is a schematic structural view of an air-injection spacing ring in an embodiment of the present invention;

fig. 5 is a schematic plan view of an annular cavity structure in an embodiment of the present invention;

fig. 6 is a three-dimensional schematic diagram of the annular cavity structure in the embodiment of the present invention.

Reference numerals:

1: a bearing housing; 101: a bearing cylinder; 102: a bearing end cap; 2: an air injection limiting ring; 201: an annular body; 202: a limiting through hole; 203: a limiting flange; 204: a limiting block; 205: a base edge; 206: a partition plate; 207: a pressurizing passage; 3: a rolling section; 4: an annular cavity;

a1: an air inlet; a2: and an air injection gap.

Detailed Description

an air bearing, comprising: an air injection limiting ring 2; the bearing outer sleeve 1 is sleeved on the outer side of the air injection limiting ring 2; the annular cavity 4 is formed by the inner wall of the bearing outer sleeve 1 and the outer wall of the air injection limiting ring 2; the rolling part 3 is arranged on the air injection limiting ring 2, exposed out of the inner wall of the air injection limiting ring 2 and used for abutting against the external rolling shaft; an air inlet a1 provided in the bearing housing 1; wherein an air injection gap A2 is arranged between the rolling part 3 and the air injection spacing ring 2; the air inlet a1 communicates with the air jet gap a2 through the annular cavity 4.

Preferably, the gas-injection spacing ring 2 comprises: an annular body 201; the limiting through holes 202 are arranged on the annular body 201 in a surrounding array mode and used for placing the rolling parts 3, and the through hole directions of the limiting through holes 202 are perpendicular to the central axis of the annular body 201; the limiting flange 203 is arranged at the port of the limiting through hole 202 close to one side of the center of the annular body 201; the limiting flange 203 is used for limiting the rolling part 3 from coming out from the limiting through hole 202 close to the port on one side of the center of the annular body 201.

Preferably, the air ejection gap a2 is provided between the stopper flange 203 and the rolling part 3.

Preferably, the air injection spacing ring 2 further comprises: can dismantle the setting and be in on the cyclic annular body 201, and be located spacing through-hole 202 is kept away from stopper 204 of cyclic annular body 201 center side port department.

Preferably, the air injection spacing ring 2 further comprises: and the pressurizing channel 207 is arranged on the limiting block 204 and is used for increasing the air pressure of one side of the rolling part 3, which is far away from the center of the air injection limiting ring 2.

Preferably, the rolling part 3 is any one of a sphere, an ellipsoid, a cylinder, and a circular truncated cone.

an air bearing, comprising: the bearing comprises a bearing outer sleeve 1, an air injection limiting ring 2, a rolling part 3 and an annular cavity 4; the air injection spacing ring 2 comprises: the device comprises an annular body 201, a limiting through hole 202 and a limiting flange 203; the limiting through holes 202 are arranged on the annular body 201 in a surrounding array mode, and the through hole direction of the limiting through holes 202 is perpendicular to the central axis of the annular body 201; the limiting flange 203 is arranged at a port of the limiting through hole 202 close to one side of the center of the annular body 201; the rolling part 3 is arranged in the limit through hole 202, the rolling part 3 is exposed from the limit flange 203 to the center direction of the annular body 201, and an air injection gap A2 is formed between the rolling part 3 and the limit flange 203; the bearing outer sleeve 1 is covered on the outer side of the annular body 201, and the annular cavity 4 is formed by the bearing outer sleeve 1 and the outer edge of the annular body 201; the bearing outer sleeve 1 is provided with an air inlet A1, and the annular cavity 4 is only communicated with the air inlet A1 and the limiting through hole 202.

Preferably, the gas-injection spacing ring 2 comprises: a base edge 205; one side end surface of the annular body 201 extends outwards in the radial direction to form the base edge 205; the bearing housing 1 includes: a bearing cylinder 101 and a bearing end cover 102; the bearing end cover 102 is disposed on a port of the bearing cylinder 101 and extends toward an axis of the bearing cylinder 101; a port of the bearing cylinder 101 far away from the bearing end cover 102 is hermetically installed on the base edge 205; the bearing end cover 102 is hermetically mounted on the other side end face of the annular body 201.

Preferably, the air injection spacing ring 2 further comprises: a stopper 204; the limiting block 204 is detachably arranged on the annular body 201 and is located at a position, far away from the central side port of the annular body 201, of the limiting through hole 202.

Preferably, the air injection spacing ring 2 further comprises: a partition 206; the spacing through holes 202 are separated by the partition plate 206; the limiting block 204 is arranged on the partition plate 206;

preferably, the air injection spacing ring 2 further comprises: a pressurizing passage 207; the pressurizing channel 207 is arranged on the limiting block 204; the area of the port of the plenum channel 207 near the annular cavity 4 is larger than the area of the port near the roll 3.

Preferably, the air inlet a1 is provided in the bearing cylinder 101.

Preferably, a plurality of the air inlets a1 are arranged in an array on the bearing cylinder 101.

In the present invention, the width of the annular cavity 4 (i.e. the width of the gap between the inner wall of the bearing housing and the outer wall of the air-injection spacing ring) is 0.1-500mm, preferably 1-400mm, more preferably 2-300m, and even more preferably 3-200 mm.

In the present invention, the exposed portion of the rolling portion 3 from the inner wall of the air-jet retainer ring accounts for 1 to 50% (volume ratio), preferably 2 to 45% (volume ratio), more preferably 3 to 40% (volume ratio), and still more preferably 4 to 30% (volume ratio) of the entire rolling portion.

In the present invention, the width of the air ejection gap a2 (the maximum gap width between the rolling portion and the air ejection retainer ring in any state) is 0.01 to 20mm, preferably 0.05 to 18mm, more preferably 0.08 to 15mm, and still more preferably 0.1 to 10 mm.

Example 1

An air bearing, comprising: an air injection limiting ring 2; the bearing outer sleeve 1 is sleeved on the outer side of the air injection limiting ring 2; the annular cavity 4 is formed by the inner wall of the bearing outer sleeve 1 and the outer wall of the air injection limiting ring 2; the rolling part 3 is arranged on the air injection limiting ring 2, exposed out of the inner wall of the air injection limiting ring 2 and used for abutting against the external rolling shaft; an air inlet a1 provided in the bearing housing 1; wherein an air injection gap A2 is arranged between the rolling part 3 and the air injection spacing ring 2; the air inlet a1 communicates with the air jet gap a2 through the annular cavity 4. Wherein: the width of the annular cavity 4 is 3 mm.

Example 2

Example 1 was repeated except that the gas injection stop collar 2 included: an annular body 201; the limiting through holes 202 are arranged on the annular body 201 in a surrounding array mode and used for placing the rolling parts 3, and the through hole directions of the limiting through holes 202 are perpendicular to the central axis of the annular body 201; the limiting flange 203 is arranged at the port of the limiting through hole 202 close to one side of the center of the annular body 201; the limiting flange 203 is used for limiting the rolling part 3 from coming out from the limiting through hole 202 close to the port on one side of the center of the annular body 201.

Example 3

Example 2 was repeated except that the air ejection gap a2 was provided between the position-defining flange 203 and the rolling portion 3. The outer diameter (diameter) of the air bearing was 25 cm. The width of the annular cavity 4 is 5 mm. The exposed part of the rolling part 3 from the inner wall of the air injection spacing ring accounts for 10 percent of the whole rolling part. The width of the air jet gap a2 was 0.1 mm.

Example 4

Example 3 was repeated except that the gas injection spacing ring 2 further included: can dismantle the setting and be in on the cyclic annular body 201, and be located spacing through-hole 202 is kept away from stopper 204 of cyclic annular body 201 center side port department.

Example 5

Example 4 was repeated except that the gas injection spacing ring 2 further included: and the pressurizing channel 207 is arranged on the limiting block 204 and is used for increasing the air pressure of one side of the rolling part 3, which is far away from the center of the air injection limiting ring 2.

Example 6

Example 5 was repeated except that the rolling part 3 was any one of a sphere, an ellipsoid, a cylinder and a circular truncated cone.

Example 7

Example 8

Example 7 was repeated except that the gas injection spacing ring 2 included: a base edge 205; one side end surface of the annular body 201 extends outwards in the radial direction to form the base edge 205; the bearing housing 1 includes: a bearing cylinder 101 and a bearing end cover 102; the bearing end cover 102 is disposed on a port (or a side) of the bearing cylinder 101 and extends toward an axis of the bearing cylinder 101; a port of the bearing cylinder 101 far away from the bearing end cover 102 is hermetically installed on the base edge 205; the bearing end cover 102 is hermetically mounted on the other side end face of the annular body 201.

Example 9

Example 8 was repeated except that the gas injection spacing ring 2 further included: a stopper 204; the limiting block 204 is detachably arranged on the annular body 201 and is located at a position, far away from the central side port of the annular body 201, of the limiting through hole 202.

Example 10

Example 9 is repeated except that the gas injection spacing ring 2 further comprises: a partition 206; the spacing through holes 202 are separated by the partition plate 206; the limiting block 204 is arranged on the partition plate 206;

example 11

Example 10 was repeated except that the gas injection spacing ring 2 further included: a pressurizing passage 207; the pressurizing channel 207 is arranged on the limiting block 204; the area of the port of the plenum channel 207 near the annular cavity 4 is larger than the area of the port near the roll 3.

Example 12

Example 11 is repeated except that the inlet port a1 is provided on the bearing cylinder 101.

Example 13

Example 12 was repeated except that a plurality of the arrays of the intake ports a1 were provided on the bearing cylinder 101.

Example 14

Example 13 was repeated except that the rolling part 3 was a cylinder.

Claims

1. An air bearing, comprising:

an air injection limit ring (2);

the bearing outer sleeve (1) is sleeved on the outer side of the air injection limiting ring (2);

the annular cavity (4) is formed by the inner wall of the bearing outer sleeve (1) and the outer wall of the air injection limiting ring (2);

the rolling part (3) is arranged on the air injection limiting ring (2), exposed from the inner wall of the air injection limiting ring (2) and used for abutting against the external rolling shaft;

an air inlet (A1) provided in the bearing housing (1);

wherein an air injection gap (A2) is arranged between the rolling part (3) and the air injection spacing ring (2);

the air inlet (A1) communicating with the air jet gap (A2) through the annular cavity (4);

wherein: the width of the annular cavity (4) is 0.1-500 mm.

2. An air bearing according to claim 1, characterized in that the jet stop collar (2) comprises:

an annular body (201);

the limiting through holes (202) are arranged on the annular body (201) in a surrounding array mode and used for placing the rolling parts (3), and the through hole directions of the limiting through holes (202) are perpendicular to the central axis of the annular body (201);

the limiting flange (203) is arranged at the port of the limiting through hole (202) close to one side of the center of the annular body (201);

the limiting flange (203) is used for limiting the rolling part (3) to be separated from a port, close to one side of the center of the annular body (201), of the limiting through hole (202).

3. An air bearing according to claim 2, characterized in that the air jet gap (a2) is provided between the position-defining flange (203) and the rolling part (3).

4. The air bearing according to claim 2, wherein the jet stop collar (2) further comprises:

the limiting through hole (202) is arranged on the annular body (201) in a detachable mode and is far away from a limiting block (204) at one side port of the center of the annular body (201).

5. The air bearing according to claim 4, wherein the jet stop collar (2) further comprises: and the pressurizing channel (207) is arranged on the limiting block (204) and is used for increasing the air pressure of one side of the rolling part (3) far away from the center of the air injection limiting ring (2).

6. An air bearing according to any of claims 1-5, characterized in that the rolling part (3) is any of a sphere, an ellipsoid, a cylinder, a truncated cone.

7. An air bearing, comprising: the bearing comprises a bearing outer sleeve (1), an air injection limiting ring (2), a rolling part (3) and an annular cavity (4);

the air injection limiting ring (2) comprises: the device comprises an annular body (201), a limiting through hole (202) and a limiting flange (203);

the limiting through holes (202) are arranged on the annular body (201) in a surrounding array mode, and the through hole direction of the limiting through holes (202) is perpendicular to the central axis of the annular body (201);

the limiting flange (203) is arranged at a port of the limiting through hole (202) close to one side of the center of the annular body (201);

the rolling part (3) is arranged in the limit through hole (202), the rolling part (3) is exposed from the limit flange (203) to the center direction of the annular body (201), and an air injection gap (A2) is formed between the rolling part (3) and the limit flange (203);

the bearing outer sleeve (1) is covered on the outer side of the annular body (201), and the bearing outer sleeve (1) and the outer edge of the annular body (201) form the annular cavity (4);

the bearing outer sleeve (1) is provided with an air inlet (A1), and the annular cavity (4) is only communicated with the air inlet (A1) and the limiting through hole (202);

wherein: the width of the annular cavity (4) is 0.1-500 mm.

8. An air bearing according to claim 7, characterized in that the jet stop collar (2) comprises: a base edge (205);

one end surface of the annular body (201) extends outwards along the radial direction to form the base edge (205);

the bearing outer sleeve (1) comprises: a bearing cylinder (101) and a bearing end cover (102); the bearing end cover (102) is arranged on one port of the bearing cylinder body (101) and extends towards the axis of the bearing cylinder body (101);

a port of the bearing cylinder body (101) far away from the bearing end cover (102) is hermetically installed on the base edge (205);

the bearing end cover (102) is hermetically arranged on the other side end face of the annular body (201).

9. The air bearing of claim 8, wherein the jet stop collar (2) further comprises: a stop block (204); the limiting block (204) is arranged on the annular body (201) in a detachable mode and is located at a position, far away from the center side port of the annular body (201), of the limiting through hole (202).

10. The air bearing of claim 9, wherein the jet stop collar (2) further comprises: a partition (206); the spacing through holes (202) are separated by the partition plate (206); the limiting block (204) is arranged on the partition plate (206).

11. The air bearing of claim 10, wherein the jet stop collar (2) further comprises: a pressurizing passage (207); the pressurizing channel (207) is arranged on the limiting block (204); the area of the port of the pressurizing channel (207) close to the annular cavity (4) is larger than that of the port close to the rolling part (3).

12. An air bearing according to any of claims 8-11, characterized in that the air inlet (a1) is provided on the bearing cylinder (101).

13. An air bearing according to claim 12, wherein a plurality of said arrays of air inlets (a1) are provided on said bearing cylinder (101).

14. An air bearing according to any of claims 7-11, 13, wherein the rolling part (3) is any of a sphere, an ellipsoid, a cylinder, a truncated cone.

15. An air bearing according to claim 12, characterized in that the rolling part (3) is any of a sphere, an ellipsoid, a cylinder, a truncated cone.