Elastic foil gas bearing and transmission device

Abstract

The present invention belongs to the field of mechanical transmission technology and discloses an elastic foil gas bearing, comprising an elastic foil gas bearing body, a bearing ring, and a rotary jet device; the bearing ring is sleeved and fixed on the outer side of the elastic foil gas bearing body, a rotary jet device mounting groove is formed on the side wall of the bearing ring facing the elastic foil gas bearing body, the notch of the rotary jet device mounting groove is directly opposite to the gap on the elastic foil gas bearing body, the rotary jet device is rotatably arranged in the rotary jet device mounting groove, the rotary jet device is formed with a jet channel, and an air bleed channel is formed on the bearing ring at a position corresponding to the rotary jet device mounting groove, the air bleed channel is connected to the jet channel and is used to introduce high-pressure airflow into the jet channel. The direction of the high-pressure airflow ejected from the jet channel toward the shaft neck is adjusted by the rotation of the rotary jet device within the rotary jet device mounting groove. The present invention can adjust the direction of the airflow ejected toward the shaft neck, thereby reducing the airflow velocity on the rotor surface.

Description

Technical Field

[0001] The present invention belongs to the technical field of mechanical transmission, and more specifically, 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 and 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 and have a simple structure. They are one of the key technologies for oil-free lubrication.

[0003] Conventional elastic foil gas bearings rely on a high-speed rotating rotor to exert pressure on the gas, using the wedge effect to generate dynamic pressure to carry the load. The elastic foil used in these bearings not only provides a certain degree of rigidity but also provides a vibration damping 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 response to the shortcomings of the existing technology, the present invention innovatively provides an elastic foil gas bearing and transmission device, which can spray high-pressure air of a certain flow rate and pressure onto the journal surface, thereby reducing the airflow velocity on the rotor surface and reducing turbulence, thereby improving the stability of the bearing-rotor system. Moreover, the airflow injection angle is adjustable, 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 for being mounted on a matching shaft neck, comprising an elastic foil gas bearing body, the elastic foil gas bearing body being mounted on the outer side of the shaft neck, a bearing ring, and a rotating air jet device;

[0006] The bearing ring is sleeved and fixed on the outer side of the elastic foil gas bearing body. A rotating jet device mounting groove is provided on the side wall of the bearing ring facing the elastic foil gas bearing body. The notch of the rotating jet device mounting groove is opposite to the gap on the elastic foil gas bearing body. The rotating jet device is rotatably arranged in the rotating jet device mounting groove. A jet channel is provided on the rotating jet device. An air bleed channel is provided on the bearing ring at a position corresponding to the rotating jet device mounting groove. The air bleed channel is connected to the jet channel and is used to introduce high-pressure airflow into the jet channel. 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 mounting groove.

[0007] Furthermore, the rotary jet device includes an air 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 air jet cylinder, and the center of the air guide fan-shaped block is fixedly connected to the air jet cylinder; the air jet cylinder is provided with an air jet through-hole along the diameter direction of the air 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 air jet through-holes are connected to form the air jet channel;

[0008] The rotating jet device installation groove includes 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 channel is provided at a position on the bearing ring corresponding to the fan-shaped groove, and the air inlet channel is communicated with the air guide hole.

[0010] Furthermore, an inwardly extending air duct 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 is connected to all the air injection holes to form the air duct channel; when the air guide sector block is rotated by the air injection cylinder, the air guide hole on the air guide sector block is 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 toward 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 jet channels along the axial direction of the bearing ring.

[0014] Furthermore, 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, with adjacent top foils maintaining a distance to form the gap;

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

[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] To achieve the above technical objectives, the second aspect of the present invention discloses a transmission device, comprising 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 rotary jet device, which can spray air 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. 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 3D is a schematic diagram 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. Rotating 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 arch foil; 5. Fan gear; 6. Internal gear ring; 7. Journal. DETAILED DESCRIPTION

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

[0029] This embodiment specifically discloses an elastic foil gas bearing, which is used to be sleeved on a matching shaft neck 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 outside of the shaft neck 7. The elastic foil gas bearing body 4 includes a bottom arch foil 42 and a top foil 41. The top foil 41 is arc-shaped. Multiple top foils 41 are evenly distributed along the circumference of the shaft neck 7 and fit on the shaft neck 7. Adjacent top foils 41 are spaced to form gaps. The elastic foil gas bearing body 4 is also provided with multiple gaps, the number of gaps being the same as the number of top foils 41. Each top foil 41 is supported on the outside by a corresponding bottom arch foil 42. The bottom arch foil 42 is fixedly connected to the top foil 41, and the ends of the bottom arch foil 42 do not exceed the ends of the top foil 41.

[0030] The bearing ring 1 is fixedly mounted 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 Figure 4, the bottom 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. The fixing method can be welding or riveting. A rotary jet device mounting slot 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 mounting the rotary jet device. The slot of the rotary jet device mounting slot is aligned with the gap in the elastic foil gas bearing body 4, allowing gas to be sprayed toward the shaft neck through the slot and the gap. Preferably, the number of rotary jet device mounting slots is the same as the number of gaps and corresponds one-to-one, so that the shaft neck can be sprayed symmetrically. The rotary jet device 10 is rotatably mounted within the rotary jet device mounting slot. The rotary jet device 10 is provided with a jet channel 20. The bearing ring 1 is provided with an air bleed channel 15 at a position corresponding to the rotary jet device mounting slot. The air bleed channel 15 is connected to the jet channel 20 and is used to introduce high-pressure air into the jet channel 20. The rotation of the rotary jet device 10 within the rotary jet device mounting slot adjusts the direction of the high-pressure airflow from the jet channel 20 toward the shaft neck 7. That is, by rotating the 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 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 an air 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 air jet cylinder 2, and the center of the air guide fan-shaped block 3 is fixedly connected to the air 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 air jet cylinder 2 is provided with an air jet through-hole 21 along the diameter direction of the air jet cylinder 2. The air jet through-hole 21 penetrates the air jet cylinder 2 in the diameter direction of the air 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 air jet through-hole 21 are connected to form an air jet channel 20; as shown Figure 4 As shown, each air guide sector block 3 is provided with an air guide hole 31, and each position of the air injection cylinder 2 corresponding to an air guide sector block 3 is provided with an air injection hole 21. The air injection hole 21 and the air guide hole 31 form an air injection channel 20. The air injection 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 multiple jet channels 20 along the axial direction of the bearing ring 1. Specifically, multiple air-guiding sectors 3 are axially fixed to the sidewalls of the jet cylinder 2 to increase the jet flow rate. Furthermore, the flow rate of the high-pressure airflow can be adjusted by selecting the number of jet channels 20 used for jetting the high-pressure airflow.

[0033] like Figure 1 、2 As shown in Figure 4, the installation groove for 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 for the rotating jet device is opened on the cylindrical groove 11. The cylindrical groove 11 has a strip-shaped opening as a notch along the axial direction on the side facing the elastic foil gas bearing body 4. This allows the cylindrical groove 11 to communicate 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 shaft neck 7 through the gap. The number of fan-shaped grooves 12 is the same as the number of air-guiding fan-shaped blocks 3 on the jet cylinder 2. The fan-shaped grooves 12 and the cylindrical groove 11 intersect and communicate with each other. The jet cylinder 2 is rotatably arranged in the cylindrical groove 11 to drive the air-guiding fan-shaped blocks 3 to rotate within the fan-shaped groove 12. At this time, the jet cylinder 2 acts as a rotating shaft and 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. Specifically, as Figure 1-4 As shown, the outer wall of the bearing ring 1 is provided with an inwardly extending air duct 14 for accessing a high-pressure gas 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 access an external high-pressure gas source from 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 selectively connects with a jet hole 13 on the fan-shaped groove 12, so that the jet channel 20 is connected with the air duct channel 15, and the jet through hole 21 is connected with the gap, that is, the airflow can be sprayed toward the journal 7 through the gap. As shown Figure 4 As shown, multiple air jet holes 13 on the bearing ring 1 are arranged radially along the fan-shaped groove. When the air jet cylinder 2 and the air guide sector block 3 rotate, they ensure that the air jet through hole 21, the air guide hole 31, and one of the air jet holes 13 are connected, and high-pressure airflow is sprayed onto the shaft journal 7. The rotation of the air jet cylinder 2 and the air guide sector block 3 changes the angle between the axial direction of the air jet through hole 21 and the outer circumference of the shaft journal 7, thereby adjusting the airflow direction, reducing the airflow velocity on the rotor surface, disrupting the originally turbulent flow, and effectively improving the stability of the bearing-rotor system.

[0035] Optionally, the axes of the multiple jet holes 13 set 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 from the central axis of the bearing ring to the left, and the jet holes 13 deviating from the central axis of the bearing ring to the right. 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 from the central axis of the bearing ring to the left, or the jet holes 13 deviating from the central axis of the bearing ring to the right, different jet effects will be achieved.

[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 air injection holes 13. Preferably, the air injection holes 13 are located in the center 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 air injection holes 13, when the air guide holes 31 on the air guide sector block 3 are aligned with the rightmost air injection hole 13, the left edge of the air guide sector block 3 can just cover the leftmost air injection hole 13, preventing gas leakage and achieving a good leak prevention effect. The same applies in the opposite direction.

[0037] Preferably, the bearing ring 1 is uniformly provided with a plurality of rotary jet device mounting slots along the circumference, and the number of rotary jet devices 10 is the same as the number of rotary jet device mounting slots. More preferably, the number of rotary jet devices 10 and rotary jet device mounting slots is the same as the number of gaps in 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 sector 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 ring gear 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 ring gear 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 ring gear 6 to drive the inner ring gear 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 ring gear 6 is one, and the number of the sector gears 5 is the same as the number of the jet cylinders 2 and is connected one-to-one. 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 engaged 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 air injection cylinder 2 to rotate.

[0042] The working principle of the elastic foil gas bearing of the embodiment of the present application is as follows:

[0043] When the bearing is working, the air ducting holes 14 arranged on the outer side of the bearing ring 1 are connected to the external high-pressure air source, thereby introducing 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 holes 13 are connected with the air ducting holes 14. The high-pressure airflow enters the jet hole 13 from the air ducting hole 14 and then enters the air guide hole 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 cool the shaft neck 7. When the jet is directed obliquely (i.e., not perpendicular to the circumference of the journal), the oblique airflow can reduce the velocity of the airflow on the rotor surface, disrupting the turbulent flow and effectively increasing the stability of the bearing-rotor system. This effect is particularly pronounced when the jet direction is opposite to the bearing's rotational direction. Bearing ring 1 is provided with multiple jet holes 13. When air guide sector 3 rotates, these holes ensure connectivity between the bleed air passage and the jet passage, effectively adjusting the direction of the jet flow.

[0044] The elastic foil gas bearing of this 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 air 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 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 blocks and fan-shaped slots of the present invention, particularly the fact that the fan-shaped arc circumference of the air-guiding fan-shaped blocks is more than twice the circumference covered by the air jet holes, allows for a simple and reliable structure to adjust the direction of the airflow on the rotor surface, extending the adjustment range.

[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 should 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" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to 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 specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0050] In the description of this specification, the reference terms "this embodiment", "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean 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 expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in an appropriate manner in any at least one embodiment or example. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0051] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise 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 replacements and simple improvements made to the essential contents of the present invention should be included in the scope of protection 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 outside of the shaft neck (7), and characterized in that: 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 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 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; The rotary jet device (10) comprises an air 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 air jet cylinder (2), and the center of the air guide fan-shaped block (3) is fixedly connected to the air jet cylinder (2); the air jet cylinder (2) is provided with an air jet through hole (21) along the diameter direction of the air jet cylinder (2), and 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), and the air guide hole (31) and the air jet through hole (21) are connected to form the air 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 air inlet channel (15) is provided at a position on the bearing ring (1) corresponding to the fan-shaped groove (12), and the air inlet channel (15) is communicated with the air guide hole (31); An inwardly extending air duct (14) is provided on the outer side wall of the bearing ring (1) for accessing a high-pressure air source. A plurality of air jet holes (13) are provided along the radial direction of the fan-shaped groove (12) on the bearing ring (1). The air duct hole (14) and all the air jet holes (13) are connected to form the air duct channel (15). When the air guide sector block (3) is rotated by the air jet cylinder (2), the air guide hole (31) on the air guide sector block (3) is selectively connected to one of the air jet holes (13) on the bearing ring (1).

2. The elastic foil gas bearing according to claim 1, 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).

3. The elastic foil gas bearing according to claim 1, 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).

4. The elastic foil gas bearing according to any one of claims 1 to 3, 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).

5. 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), with adjacent top foils (41) maintaining a distance to form the gap; The outer side of each top foil (41) is correspondingly supported by the bottom arch foil (42).

6. The elastic foil gas bearing according to claim 1, characterized in that: It also includes 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.

7. The elastic foil gas bearing according to claim 6, 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).

8. A transmission device, characterized in that: The elastic foil gas bearing comprises the elastic foil gas bearing according to any one of claims 1 to 7.

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