Elastic foil gas bearing and transmission device

Abstract

The invention belongs to the technical field of mechanical transmission, and discloses an elastic foil gas bearing which comprises an elastic foil gas bearing body, a bearing ring and a rotary gas injection device. The bearing ring is fixedly arranged on the outer side of the elastic foil gas bearing body in a sleeving mode, a rotary gas spraying device mounting groove is formed in the side wall, facing the elastic foil gas bearing body, of the bearing ring, and a groove opening of the rotary gas spraying device mounting groove right faces a gap in the elastic foil gas bearing body. The rotary air injection device is rotationally arranged in the rotary air injection device mounting groove, an air injection channel is formed in the rotary air injection device, and an air entraining channel is formed in the position, corresponding to the rotary air injection device mounting groove, of the bearing ring, communicates with the air injection channel and is used for introducing high-pressure air flow into the air injection channel; and the direction of high-pressure airflow sprayed from the air spraying channel to the shaft neck is adjusted through rotation of the rotary air spraying device in the rotary air spraying device mounting groove. The direction of airflow sprayed to the shaft neck can be adjusted, so that the flowing speed of the airflow on the surface of the rotor is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of mechanical transmission, and more specifically, the present invention relates to an elastic foil gas bearing and a transmission device. Background Art

[0002] Bearings are components that fix and reduce the load friction coefficient during mechanical transmission. Their main function is to support mechanical rotating bodies to reduce the mechanical load friction coefficient of the equipment during transmission. In recent years, with the increasing application of high-speed rotating machinery in aerospace, energy equipment and other fields, the working environment has become increasingly harsh, and the requirements for lubrication and support have gradually increased. In oil-free lubrication systems, compared with complex and expensive support methods such as electromagnetic bearings, elastic foil gas bearings have the advantages of high speed, good adaptability, no wear, low cost, high reliability, and high temperature resistance. They do not require additional auxiliary devices such as oil supply, have a simple structure, and are one of the key technologies for oil-free lubrication.

[0003] Traditional elastic foil gas bearings rely on the high-speed rotating rotor to exert pressure on the gas, using the wedge effect to generate dynamic pressure to carry the load. This bearing uses elastic foil as its structure, which not only has a certain rigidity, but also provides a shock-absorbing effect, allowing the bearing to withstand a certain load. However, due to the cross-coupling effect of the gas dynamic pressure, the stability of this bearing-rotor system is not ideal. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention innovatively provides an elastic foil gas bearing and a transmission device, which can spray high-pressure air of a certain flow rate and pressure onto the surface of the journal, so that the airflow velocity on the rotor surface is reduced, and turbulence is reduced, thereby improving the stability of the bearing-rotor system. Moreover, the airflow injection angle can be adjusted, further improving the stability of the bearing-rotor system.

[0005] To achieve the above technical objectives, the present invention discloses, in a first aspect, an elastic foil gas bearing, which is used to be sleeved on a matching shaft neck, and includes an elastic foil gas bearing body, the elastic foil gas bearing body is sleeved and fitted on the outer side of the shaft neck, and also includes a bearing ring and a rotating jet device;

[0006] The bearing ring is sleeved and fixed on the outer side of the elastic foil gas bearing body, and a rotating jet device installation groove is provided on the side wall of the bearing ring facing the elastic foil gas bearing body, and the notch of the rotating jet device installation groove is opposite to the gap on the elastic foil gas bearing body, and the rotating jet device is rotatably arranged in the rotating jet device installation groove, and a jet channel is provided on the rotating jet device, and an air bleed channel is provided on the bearing ring at a position corresponding to the rotating jet device installation groove, and the air bleed channel is connected with the jet channel and is used to introduce high-pressure airflow into the jet channel, and the direction of the high-pressure airflow sprayed from the jet channel to the shaft neck is adjusted by rotating the rotating jet device in the rotating jet device installation groove.

[0007] Further, the rotary jet device comprises a jet cylinder and an air guide fan-shaped block, one or more air guide fan-shaped blocks are fixed axially on the side wall of the jet cylinder, and the center of the air guide fan-shaped block is fixedly connected to the jet cylinder; the jet cylinder is provided with jet through holes along the diameter direction of the jet cylinder, and the air guide fan-shaped block is provided with air guide holes along the radial direction of the air guide fan-shaped block, and the air guide holes and the jet through holes are connected to form the jet channel;

[0008] The rotating jet device installation groove comprises a cylindrical groove arranged along the axial direction of the bearing ring and a fan-shaped groove arranged along the circumference of the bearing ring. The notch of the rotating jet device installation groove is opened on the cylindrical groove. The fan-shaped groove and the cylindrical groove intersect. The jet cylinder is rotatably arranged in the cylindrical groove to drive the air guide fan-shaped block to rotate in the fan-shaped groove.

[0009] The air inlet passage is provided at a position on the bearing ring corresponding to the fan-shaped groove, and the air inlet passage is communicated with the air guide hole.

[0010] Furthermore, an inwardly extending air duct hole is provided on the outer side wall of the bearing ring for connecting to a high-pressure air source, and a plurality of air injection holes are provided along the radial direction of the fan-shaped groove on the bearing ring along the circumferential side wall of the fan-shaped groove, and the air duct hole and all the air injection holes are connected to form the air duct channel; when the air guide fan-shaped block is rotated by the air injection cylinder, the air guide holes on the air guide fan-shaped block are selectively connected to one of the air injection holes on the bearing ring.

[0011] Further, the plurality of air injection holes include air injection holes pointing to the central axis of the bearing ring, air injection holes deviating to the left from the central axis of the bearing ring, and air injection holes deviating to the right from the central axis of the bearing ring.

[0012] Furthermore, the circumference of the fan-shaped arc of the air guide fan-shaped block is greater than twice the circumference covered by all the air injection holes.

[0013] Furthermore, the rotary jet device is provided with a plurality of the jet channels along the axial direction of the bearing ring.

[0014] Further, the elastic foil gas bearing body comprises a bottom arch foil and a top foil;

[0015] The top foil is in an arc shape, and a plurality of the top foils are evenly distributed along the circumference of the journal and attached to the journal, and a distance is maintained between adjacent top foils to form the gap;

[0016] The bottom arch foil is correspondingly supported on the outer side of each top foil.

[0017] Furthermore, it also includes a driving device, which is connected to the jet cylinder through a transmission device and is used to drive the jet cylinder to rotate.

[0018] Furthermore, the transmission device includes a sector gear and an inner gear ring meshing with the sector gear, the center of the sector gear is fixedly connected to the jet cylinder, and the inner gear ring is fixed on the bearing ring.

[0019] In order to achieve the above technical objectives, the second aspect of the present invention discloses a transmission device, including the elastic foil gas bearing described in the first aspect.

[0020] The beneficial effects of the present invention are:

[0021] The bearing ring of the present invention is provided with a rotatable rotating jet device, which can spray airflow toward the shaft neck. When the rotating jet device rotates, the direction of the airflow sprayed toward the shaft neck can be adjusted, so that the airflow flow speed on the rotor surface is reduced, disrupting the flow originally in a turbulent state, and effectively increasing the stability of the bearing-rotor system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of the elastic foil gas bearing according to an embodiment of the present invention.

[0023] Figure 2 It is a schematic diagram of the three-dimensional structure of the other side of the elastic foil gas bearing according to an embodiment of the present invention.

[0024] Figure 3 It is a right side view of the elastic foil gas bearing according to an embodiment of the present invention.

[0025] Figure 4 AA cross-sectional view of the elastic foil gas bearing according to an embodiment of the present invention.

[0026] Figure 5 4 is a front view of an elastic foil gas bearing according to an embodiment of the present invention.

[0027] 1. First bearing ring; 11. Cylindrical groove; 12. Fan-shaped groove; 13. Jet hole; 14. Air bleed hole; 15. Air bleed channel; 10. Rotary jet device; 2. Jet cylinder; 21. Jet through hole; 3. Air guide fan-shaped block; 31. Air guide hole; 20. Jet channel; 4. Elastic foil gas bearing body; 41. Top foil; 42. Bottom foil; 5. Fan gear; 6. Internal gear ring; 7. Journal. DETAILED DESCRIPTION

[0028] The elastic foil gas bearing and the transmission device provided by the present invention are explained and illustrated in detail below in conjunction with the drawings in the specification.

[0029] This embodiment specifically discloses an elastic foil gas bearing, which is used to be sleeved on a matching shaft journal 7, such as Figure 1-4 As shown, it includes a bearing ring 1, an elastic foil gas bearing body 4 and a rotating jet device 10. The elastic foil gas bearing body 4 is sleeved and fitted on the outer side of the journal 7. The elastic foil gas bearing body 4 includes a bottom arch foil 42 and a top foil 41. The top foil 41 is in an arc shape. Multiple top foils 41 are evenly distributed along the circumference of the journal 7 and fit on the journal 7. The adjacent top foils 41 are spaced to form gaps. There are also multiple gaps on the elastic foil gas bearing body 4, and the number of gaps is the same as the number of top foils 41. The outer side of each top foil 41 is supported by a bottom arch foil 42. The bottom arch foil 42 is fixedly connected to the top foil 41, and the two ends of the bottom arch foil 42 do not exceed the two ends of the top foil 41.

[0030] The bearing ring 1 is sleeved and fixed on the outer side of the elastic foil gas bearing body 4. In this embodiment, the inner side refers to the side close to the central axis of the elastic foil gas bearing, and the outer side refers to the side away from the central axis of the elastic foil gas bearing. Figure 1 , 2As shown in FIG. 4 , the bottom arch foil 42 is fixedly connected to the inner ring of the bearing ring 1, and one end of the top foil 41 is fixedly connected to the inner ring of the bearing ring 1, and the fixing method can be welding or riveting. A rotating jet device installation groove is provided on the side wall (i.e., the inner ring) of the bearing ring 1 facing the elastic foil gas bearing body 4, for installing the rotating jet device; the notch of the rotating jet device installation groove is directly opposite to the gap on the elastic foil gas bearing body 4, so that the gas can be sprayed toward the journal through the notch and the gap. Preferably, the number of the rotating jet device installation grooves is the same as the number of the gaps and corresponds one to one, and the journal can be sprayed symmetrically. The rotating jet device 10 is rotatably arranged in the rotating jet device installation groove, and a jet channel 20 is provided on the rotating jet device 10. An air bleed channel 15 is provided at the position corresponding to the rotating jet device installation groove on the bearing ring 1. The air bleed channel 15 is connected to the jet channel 20 and is used to introduce a high-pressure airflow into the jet channel 20. The direction of the high-pressure airflow sprayed from the jet channel 20 to the journal 7 is adjusted by rotating the rotating jet device 10 in the rotating jet device installation groove. That is, by rotating the rotary jet device 10, the angle between the jet channel 20 and the outer circumferential surface of the shaft neck 7 can be adjusted, and the direction of the high-pressure airflow blowing toward the shaft neck is adjusted, so that the airflow flow speed on the rotor surface is reduced, disrupting the flow originally in a turbulent state, and effectively increasing the stability of the bearing-rotor system.

[0031] like Figure 1-4 As shown, the rotary jet device 10 includes a jet cylinder 2 and an air guide fan-shaped block 3. One or more air guide fan-shaped blocks 3 are fixed axially on the side wall of the jet cylinder 2, and the center of the air guide fan-shaped block 3 is fixedly connected to the jet cylinder 2. When there are multiple air guide fan-shaped blocks 3, a distance is maintained between adjacent air guide fan-shaped blocks 3. The jet cylinder 2 is provided with a jet through hole 21 along the diameter direction of the jet cylinder 2. The jet through hole 21 penetrates the jet cylinder 2 in the diameter direction of the jet cylinder 2. The air guide hole 31 is provided on the air guide fan-shaped block 3 along the radial direction of the air guide fan-shaped block 3. The air guide hole 31 and the jet through hole 21 are connected to form a jet channel 20; as shown in FIG. Figure 4 As shown, each air guide sector block 3 is provided with an air guide hole 31, and each corresponding air guide sector block 3 is provided with an air jet through hole 21 on the air jet cylinder 2. The air jet through hole 21 and the air guide hole 31 form an air jet channel 20. The air jet channel 20 can be a straight line or a broken line, preferably Figure 4 The straight line shown.

[0032] Preferably, the rotary jet device 10 is provided with a plurality of jet channels 20 along the axial direction of the bearing ring 1, that is, a plurality of air guide fan-shaped blocks 3 are fixed along the axial direction on the side wall of the jet cylinder 2 to increase the jet flow rate. Moreover, the flow rate of the high-pressure airflow can be adjusted according to the number of jet channels 20 selected for jetting the high-pressure airflow.

[0033] like Figure 1 ,2 As shown in FIG. 4 , the installation groove of the rotating jet device includes a cylindrical groove 11 arranged along the axial direction of the bearing ring 1 and a fan-shaped groove 12 arranged along the circumference of the bearing ring 1. The notch of the installation groove of the rotating jet device is opened on the cylindrical groove 11. The cylindrical groove 11 is provided with a strip opening as a notch along the axial direction on one side of the elastic foil gas bearing body 4, so that the cylindrical groove 11 is connected with the gap on the elastic foil gas bearing body 4, ensuring that the airflow ejected from the jet through hole 21 can be sprayed toward the journal 7 through the gap. The number of the fan-shaped grooves 12 is the same as the number of the air-guiding fan-shaped blocks 3 on the jet cylinder 2, and the fan-shaped grooves 12 and the cylindrical grooves 11 intersect and are connected; the jet cylinder 2 is rotatably arranged in the cylindrical groove 11 to drive the air-guiding fan-shaped blocks 3 to rotate in the fan-shaped groove 12; the jet cylinder 2 plays the role of a rotating shaft at this time, and the jet cylinder 2 rotates around its own axis.

[0034] like Figure 4 As shown, an air inlet channel 15 is provided at a position corresponding to the fan-shaped groove 12 on the bearing ring 1, and the air inlet channel 15 is connected to the air guide hole 31. Figure 1-4 As shown, an inwardly extending air duct 14 is provided on the outer wall of the bearing ring 1 for connecting to a high-pressure air source. A plurality of jet holes 13 are provided along the radial direction of the fan-shaped groove 12 on the bearing ring 1 along the circumferential side wall of the fan-shaped groove 12. The air duct 14 penetrates all the jet holes 13 from the side and is connected to all the jet holes 13 to form an air duct channel 15. When the bearing is in use, it is necessary to connect an external high-pressure air source through the air duct 14 to introduce the high-pressure airflow. When the air guide sector block 3 is rotated by the jet cylinder 2, the air guide hole 31 on the air guide sector block 3 is selectively connected to a jet hole 13 on the fan-shaped groove 12, so that the jet channel 20 is connected to the air duct channel 15, and the jet through hole 21 is connected to the gap, that is, the airflow can be sprayed toward the journal 7 through the gap. As shown Figure 4 As shown, the multiple jet holes 13 on the bearing ring 1 are all arranged radially along the fan-shaped groove. When the jet cylinder 2 and the air-guiding fan-shaped block 3 rotate, the jet through hole 21, the air-guiding hole 31 and one of the jet holes 13 can be connected, and the high-pressure airflow is sprayed onto the journal 7. Through the rotation of the jet cylinder 2 and the air-guiding fan-shaped block 3, the angle between the axial direction of the jet through hole 21 and the outer circumferential surface of the journal 7 is different, that is, the airflow direction is adjusted, so that the airflow speed on the rotor surface is reduced, disrupting the flow originally in a turbulent state, and effectively increasing the stability of the bearing-rotor system.

[0035] Optionally, the axes of the multiple jet holes 13 arranged on the bearing ring 1 are along the radial direction of the fan-shaped groove 12, including the jet holes 13 pointing to the central axis of the bearing ring, the jet holes 13 deviating to the left from the central axis of the bearing ring, and the jet holes 13 deviating to the right from the central axis of the bearing ring. When the air guide fan block 3 is rotated by the jet cylinder 2, the jet through hole 21 and the air guide holes 31 on the air guide fan block 3 are respectively connected with the jet holes 13 pointing to the central axis of the bearing ring, the jet holes 13 deviating to the left from the central axis of the bearing ring, or the jet holes 13 deviating to the right from the central axis of the bearing ring, which will produce different jet effects.

[0036] Optionally, the circumference of the fan-shaped arc of the air guide sector block 3 is greater than twice the circumference covered by all the jet holes 13. Preferably, the jet holes 13 are arranged in the middle of the air guide sector block 3. When the circumference of the fan-shaped arc of the air guide sector block 3 is greater than twice the circumference covered by the jet holes 13, when the air guide holes 31 on the air guide sector block 3 are aligned with the rightmost jet hole 13, the left edge of the air guide sector block 3 can just cover the leftmost jet hole 13, avoiding gas leakage and achieving a good anti-leakage effect, and the same is true in the opposite direction.

[0037] Preferably, the bearing ring 1 is evenly provided with a plurality of rotating jet device installation grooves along the circumferential direction, and the number of the rotating jet devices 10 is the same as the number of the rotating jet device installation grooves. More preferably, the number of the rotating jet devices 10 and the rotating jet device installation grooves is the same as the number of gaps on the elastic foil gas bearing body 4.

[0038] Preferably, if Figure 1 and 2 As shown, the cylindrical groove 11 runs through the axial direction of the bearing ring 1, and a plurality of air guide fan-shaped blocks 3 are fixed on the air injection cylinder 2 along the axial direction to increase the flow rate of the air flow.

[0039] like Figure 5 As shown, in order to drive the jet cylinder 2, the elastic foil gas bearing of the present application also includes a driving device, which is connected to the jet cylinder 2 through a transmission device, and is used to drive the jet cylinder 2 to rotate around its own axis. Optionally, the transmission device includes a sector gear 5 and an inner gear ring 6 meshing with the sector gear 5, the center of the sector gear 5 is fixedly connected to the jet cylinder 2, the sector gear 5 is fixed to the side wall of the jet cylinder 2, and the inner gear ring 6 is fixed to the end face of the bearing ring 1. The driving device can be a motor, and the motor is connected to the inner gear ring 6 to drive the inner gear ring 6 to rotate, thereby driving the jet cylinder 2 to rotate. The sector gear 5 and the jet cylinder 2 are connected by welding or splines. The number of the inner gear ring 6 is one, the number of the sector gears 5 is the same as the number of the jet cylinders 2 and is connected one-to-one, and the driving device can drive all the jet cylinders to rotate at the same time.

[0040] The transmission device can also be a gear transmission device or a worm gear transmission device.

[0041] Optionally, the transmission device includes a sector gear 5 and a worm meshing with the sector gear 5. The driving device is a motor, and the motor output shaft is connected to the worm to drive the worm to rotate, thereby driving the jet cylinder 2 to rotate.

[0042] Working principle of the elastic foil gas bearing of the embodiment of the present application:

[0043] When the bearing is working, the air inlet holes 14 arranged on the outer side of the bearing ring 1 are connected to the external high-pressure air source, thereby introducing the high-pressure airflow; the driving device drives the jet cylinder 2 and the air guide fan block 3 to rotate through the transmission device, and a plurality of jet holes 13 are radially opened on the circumferential side wall of the fan-shaped groove 12. When the air guide fan block 3 is rotated by the jet cylinder 2, the air guide holes 31 on the air guide fan block 3 are selectively connected with one of the jet holes 13 on the fan-shaped groove 12, and the jet hole 13 is connected with the air inlet holes 14. The high-pressure airflow enters the jet hole 13 from the air inlet holes 14 and then enters the air guide holes 31, and finally is ejected from the jet through hole 21 on the jet cylinder 2, and is sprayed onto the shaft neck 7 through the notch of the rotating jet device mounting groove and the gap on the elastic foil gas bearing body 4, which can have a cooling effect on the shaft neck 7. When the jet direction is oblique (i.e., not perpendicular to the circumferential surface of the journal), the oblique airflow can reduce the airflow velocity on the rotor surface, disrupting the airflow that was originally in a turbulent state, and effectively increasing the stability of the bearing-rotor system, especially when the jet direction is opposite to the bearing rotation direction. The effect is particularly obvious. The bearing ring 1 is provided with a plurality of jet holes 13, and when the air guide sector block 3 rotates, the connection between the air duct and the jet channel can be ensured, and the direction of the jet airflow can be effectively adjusted.

[0044] The elastic foil gas bearing of the present application has the following advantages:

[0045] 1. The bearing ring of the present invention is provided with a rotatable rotary jet device, which can spray airflow toward the shaft neck. When the rotary jet device rotates, the direction of the airflow sprayed toward the shaft neck can be adjusted, so that the airflow flow speed on the rotor surface is reduced, disrupting the flow originally in a turbulent state, and effectively increasing the stability of the bearing-rotor system.

[0046] 2. The ingenious design of the air-guiding fan-shaped block and the fan-shaped groove of the present invention, especially the fan-shaped arc circumference of the air-guiding fan-shaped block is greater than twice the circumference covered by the jet hole. The injection direction of the airflow on the rotor surface can be adjusted with a simple and reliable structure, and the adjustment range is wider.

[0047] This embodiment also discloses a transmission device, including the elastic foil gas bearing described in the above embodiment. The transmission device can be used in the fields of aerospace, energy equipment, etc.

[0048] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0049] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0050] In the description of this specification, the description with reference to the terms "this embodiment", "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any at least one embodiment or example. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0051] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and simple improvements made to the essential contents of the present invention should be included in the protection scope of the present invention.

Claims

1. An elastic foil gas bearing, used for being sleeved on a matching shaft neck (7), comprising an elastic foil gas bearing body (4), wherein the elastic foil gas bearing body (4) is sleeved and fitted on the outer side of the shaft neck (7), characterized in that: It also includes a bearing ring (1) and a rotating jet device (10); The bearing ring (1) is sleeved and fixed on the outer side of the elastic foil gas bearing body (4); a rotating jet device installation groove is provided on the side wall of the bearing ring (1) facing the elastic foil gas bearing body (4); the notch of the rotating jet device installation groove is directly opposite to the gap on the elastic foil gas bearing body (4); the rotating jet device (10) is rotatably arranged in the rotating jet device installation groove; a jet channel (20) is provided on the rotating jet device (10); an air bleed channel (15) is provided on the bearing ring (1) at a position corresponding to the rotating jet device installation groove; the air bleed channel (15) is communicated with the jet channel (20) and is used to introduce a high-pressure airflow into the jet channel (20); and the direction of the high-pressure airflow sprayed from the jet channel (20) to the shaft neck (7) is adjusted by the rotation of the rotating jet device (10) in the rotating jet device installation groove.

2. The elastic foil gas bearing according to claim 1, characterized in that: The rotary jet device (10) comprises a jet cylinder (2) and an air guide fan-shaped block (3); one or more air guide fan-shaped blocks (3) are fixedly arranged on the side wall of the jet cylinder (2) along the axial direction; the center of the air guide fan-shaped block (3) is fixedly connected to the jet cylinder (2); the jet cylinder (2) is provided with a jet through hole (21) along the diameter direction of the jet cylinder (2); the air guide fan-shaped block (3) is provided with an air guide hole (31) along the radial direction of the air guide fan-shaped block (3); the air guide hole (31) and the jet through hole (21) are connected to form the jet channel (20); The rotating jet device installation groove comprises a cylindrical groove (11) arranged along the axial direction of the bearing ring (1) and a fan-shaped groove (12) arranged along the circumference of the bearing ring (1); the notch of the rotating jet device installation groove is opened on the cylindrical groove (11); the fan-shaped groove (12) and the cylindrical groove (11) intersect; the jet cylinder (2) is rotatably arranged in the cylindrical groove (11) to drive the air guide fan-shaped block (3) to rotate in the fan-shaped groove (12); The bearing ring (1) is provided with the air inlet passage (15) at a position corresponding to the fan-shaped groove (12), and the air inlet passage (15) is communicated with the air guide hole (31).

3. The elastic foil gas bearing according to claim 2, characterized in that: An inwardly extending air intake hole (14) is provided on the outer side wall of the bearing ring (1) for connecting to a high-pressure air source. A plurality of air injection holes (13) are provided along the radial direction of the fan-shaped groove (12) on the bearing ring (1). The air intake hole (14) is connected to all the air injection holes (13) to form the air intake channel (15). When the air guide fan-shaped block (3) is rotated by the air injection cylinder (2), the air guide hole (31) on the air guide fan-shaped block (3) is selectively connected to one of the air injection holes (13) on the bearing ring (1).

4. The elastic foil gas bearing according to claim 3, characterized in that: The plurality of jet holes (13) include jet holes (13) pointing toward the central axis of the bearing ring (1), jet holes (13) deviating to the left from the central axis of the bearing ring (1), and jet holes (13) deviating to the right from the central axis of the bearing ring (1).

5. The elastic foil gas bearing according to claim 3, characterized in that: The circumference of the fan-shaped arc of the air guide fan-shaped block (3) is greater than twice the circumference covered by all the air injection holes (13).

6. The elastic foil gas bearing according to any one of claims 1 to 5, characterized in that: The rotary jet device (10) is provided with a plurality of jet channels (20) along the axial direction of the bearing ring (1).

7. The elastic foil gas bearing according to claim 1, characterized in that: The elastic foil gas bearing body (4) comprises a bottom arch foil (42) and a top foil (41); The top foil (41) is in an arc shape, and a plurality of the top foils (41) are evenly distributed along the circumference of the shaft neck (7) and attached to the shaft neck (7), and a spacing is maintained between adjacent top foils (41) to form the gap; The outer side of each top foil sheet (41) is correspondingly supported by the bottom arch foil (42).

8. The elastic foil gas bearing according to claim 2, characterized in that: It also comprises a driving device, which is connected to the jet cylinder (2) via a transmission device and is used to drive the jet cylinder (2) to rotate.

9. The elastic foil gas bearing according to claim 8, characterized in that: The transmission device comprises a sector gear (5) and an inner gear ring (6) meshing with the sector gear (5); the center of the sector gear (5) is fixedly connected to the jet cylinder (2); and the inner gear ring (6) is fixed on the bearing ring (1).

10. A transmission device, characterized in that: The invention comprises the elastic foil gas bearing as described in any one of claims 1 to 9.

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