Aerodynamic bearing and motor

Abstract

The invention provides a gas dynamic pressure bearing and a motor, the gas dynamic pressure bearing comprises a bump foil, a top foil and a bearing seat, the bump foil comprises a bump foil main body and a wave arch, the radial inner end of the wave arch is connected with the bump foil main body, the radial outer end of the wave arch protrudes towards the bearing seat, the inner circumferential wall of the bearing seat is provided with a limiting groove, and the limiting groove is connected with the bump foil main body. The radial outer ends of the wave arches can be clamped in the limiting grooves, and elastic support for the bump foil can be formed through contact between the inner walls of the limiting grooves and the radial outer ends of the wave arches; the top foil is arranged on the inner periphery of the bump foil, the bump foil is provided with a bump foil inner wall, and the bump foil inner wall is in surface contact with the top foil. According to the gas bearing, surface contact is formed between the inner wall of the bump foil and the top foil, the contact area between the bump foil and the top foil is increased, the friction resistance of the bearing is increased, the gas bearing can have enough coulomb friction damping to dissipate redundant energy when being vibrated and impacted, and the operation stability of a system is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of air bearings, and particularly to a gas dynamic pressure bearing and a motor. Background Art

[0002] A gas dynamic pressure bearing is a self-acting bearing that uses an elastic foil structure as a flexible support and realizes the suspension of a rotor through the gas dynamic pressure effect. Compared with oil lubrication, it does not require lubrication and has significant advantages such as high operating speed, low friction loss, good adaptability to bearing misalignment, and the ability to adapt to high-temperature working environments. It has been widely used in fields such as fuel cell high-speed centrifugal air compressors, aerospace air circulation systems, helium turbine compressors, micro gas turbines, and turbochargers.

[0003] CN 111963572 A proposes a gas compressor, a motor, and a foil radial gas dynamic pressure bearing; CN112128226A proposes a foil radial gas dynamic pressure bearing and a motor. The latter's foil radial gas dynamic pressure bearing adds a limiting foil to the top foil and wave foil assembly of the former. The top foil, limiting foil, and wave foil are arranged in sequence and stacked, and finally the foil assembly is inserted into the limiting slot of the bearing sleeve. Through the limiting fit, contact between both ends of the top foil and the rotor is avoided, and the suspension of the rotor is achieved. However, the contact method between the elastic components in both patents is line contact, and the provided Coulomb friction damping is limited. When subjected to external vibration and impact, etc., the operation stability and reliability of the rotor in the system cannot be guaranteed.

[0004] Due to the technical problems in the existing gas bearings that there is a lack of sufficient Coulomb friction damping to dissipate redundant energy when subjected to vibration and impact, resulting in unstable system operation, the present invention has studied and designed a gas dynamic pressure bearing and a motor. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the existing gas bearings lack sufficient Coulomb friction damping to dissipate redundant energy when subjected to vibration and impact, resulting in unstable system operation, so as to provide a gas dynamic pressure bearing and a motor.

[0006] To solve the above problems, the present invention provides a gas dynamic pressure bearing, which includes:

[0007] A corrugated foil, a top foil and a bearing housing. The corrugated foil includes a corrugated foil body and corrugations. The radially inner end of the corrugation is connected to the corrugated foil body, and the radially outer end of the corrugation protrudes towards the bearing housing. A limiting groove is provided on the inner peripheral wall of the bearing housing, and the radially outer end of the corrugation can be clamped in the limiting groove. Elastic support for the corrugated foil can be formed through the contact between the inner wall of the limiting groove and the radially outer end of the corrugation. The top foil is arranged on the inner periphery of the corrugated foil. The corrugated foil has an inner wall of the corrugated foil, and a surface contact is formed between the inner wall of the corrugated foil and the top foil.

[0008] In some embodiments,

[0009] The corrugation includes a first corrugation and a second corrugation that bend and extend in different circumferential directions. The limiting grooves on the bearing housing include a first limiting groove and a second limiting groove. The first corrugation can be clamped in the first limiting groove, and the second corrugation can be clamped in the second limiting groove. A surface contact is formed between the outer peripheral surface of the first corrugation and the groove wall of the first limiting groove, and a surface contact is formed between the outer peripheral surface of the second corrugation and the groove wall of the second limiting groove.

[0010] In some embodiments,

[0011] The first corrugation is a curved surface corrugation. One end of the first corrugation is connected to the corrugated foil body. The other end of the first corrugation first extends outward simultaneously in the first circumferential direction and the radially outward direction, then extends simultaneously in the second circumferential direction and the radially outward direction, and finally extends simultaneously in the second circumferential direction and the radially inward direction to form a free end.

[0012] The second corrugation is also a curved surface corrugation. One end of the second corrugation is connected to the corrugated foil body. The other end of the second corrugation first extends outward simultaneously in the second circumferential direction and the radially outward direction, then extends simultaneously in the first circumferential direction and the radially outward direction, and finally extends simultaneously in the first circumferential direction and the radially inward direction to form a free end.

[0013] Wherein the first circumferential direction and the second circumferential direction are opposite directions.

[0014] In some embodiments,

[0015] The first corrugation and the second corrugation form a set of corrugation units;

[0016] In the circumferential direction, there are multiple sets of the corrugation units, and the multiple sets of corrugation units are arranged at intervals in the circumferential direction; and / or, along the axial direction of the corrugated foil, there are also multiple sets of the corrugation units, and the multiple sets of corrugation units are arranged at intervals in the axial direction.

[0017] In some embodiments,

[0018] When there are also multiple groups of the wave arch units along the axial direction of the wave foil, the wave arches of two adjacent groups of wave arch units in the axial direction are arranged with an axial stagger; and the wave arches of multiple groups of wave arch units are arranged alternately in sequence along the axial direction.

[0019] In some embodiments,

[0020] The first wave arch and the second wave arch are connected by the wave foil body; and / or, the first wave arch and the second wave arch are spaced apart and not connected, and are connected by the wave foil body between two adjacent wave arch units in the circumferential direction;

[0021] Among two adjacent groups of wave arch units in the axial direction, the first wave arch and the second wave arch of one group of wave arch units are connected by the wave foil body; the first wave arch and the second wave arch of the other group of wave arch units are spaced apart and not connected, and are connected by the wave foil body between two adjacent wave arch units in the circumferential direction.

[0022] In some embodiments,

[0023] The circumferential spacing between the first wave arch and the second wave arch connected by the wave foil body is greater than the circumferential spacing between the first wave arch and the second wave arch that are spaced apart and not connected; and / or,

[0024] The free ends of the first wave arch and the second wave arch connected by the wave foil body protrude relatively and are spaced apart by a preset distance greater than 0; the free ends of the first wave arch and the second wave arch that are not connected protrude away from each other.

[0025] In some embodiments,

[0026] The first limiting groove penetrates the bearing seat along the axial direction of the bearing seat, and the second limiting groove penetrates the bearing seat along the axial direction of the bearing seat;

[0027] When the first wave arch and the second wave arch form a group of wave arch units and there are multiple groups of the wave arch units in the circumferential direction, there are also multiple first limiting grooves in the circumferential direction, and the first limiting grooves are arranged in one-to-one correspondence with the first wave arches, and there are also multiple second limiting grooves in the circumferential direction, and the second limiting grooves are arranged in one-to-one correspondence with the second wave arches.

[0028] In some embodiments,

[0029] The circumferential spacing between one circumferential end of the first wave arch and one circumferential end of the second wave arch is the pitch of the wave arch unit, and the pitch can be adjusted; in the axial direction of the wave foil, the axial dimension of the wave arch unit is the width of the wave arch unit, the number of groups of the wave arch units is the number of divided rows, and the width of the wave arch unit and the number of divided rows can be adjusted respectively.

[0030] In some embodiments,

[0031] The outer circumferential surface of the first wave arch is an arc surface, the inner wall of the first limiting groove is also an arc surface, the outer circumferential surface of the second wave arch is an arc surface, and the inner wall of the second limiting groove is also an arc surface; in the axial projection plane of the wave foil, the first wave arch is a counterclockwise bending wave arch, the second wave arch is a clockwise bending wave arch, the first limiting groove is a counterclockwise limiting groove, and the second limiting groove is a clockwise limiting groove.

[0032] In some embodiments,

[0033] A fixing groove recessed radially outward is provided on the inner wall of the bearing seat. A wave foil free end protruding radially outward is provided at a position on the circumferential end of the wave foil where no wave arch is provided. A notch opposite to the fixing groove is provided at a position on the circumferential end of the wave foil where the wave arch is provided. A top foil fixing end protruding radially outward is provided at the circumferential end of the top foil. The wave foil free end and the top foil fixing end are integrally inserted into the fixing groove to form the fixation of the wave foil and the top foil.

[0034] The present invention also provides a motor, which includes the aforementioned gas dynamic pressure bearing.

[0035] A gas dynamic pressure bearing and a motor provided by the present invention have the following beneficial effects:

[0036] 1. By setting the wave arch of the wave foil to protrude in the radially outward direction and providing a matching limiting groove on the inner wall of the bearing seat, the radially outer end of the wave arch can be arranged in the limiting groove, so that the outwardly protruding wave arch can be elastically supported by the limiting groove. Subsequently, there is no need to provide a wave arch on the radially inner side of the wave foil, so that the inner wall of the wave foil is a large-area curved surface or arc surface structure, and a surface contact is formed between the inner wall of the wave foil and the top foil, effectively increasing the contact area between the two, increasing the frictional resistance of the bearing, enabling the gas bearing to have sufficient Coulomb friction damping to dissipate redundant energy when subjected to vibration and shock, improving the stability of the system operation, and effectively solving the problem that the gas bearing lacks sufficient Coulomb friction damping to dissipate redundant energy when subjected to vibration and shock, resulting in unstable system operation.

[0037] 2. The present invention also forms a free end structure by first causing the first wave arch to protrude outward simultaneously in the direction of the first circumferential direction and the radial outer side, then extending simultaneously in the direction of the second circumferential direction and the radial outer side, and finally extending simultaneously in the direction of the second circumferential direction and the radial inner side. This can form three arc surface segments with two bends, effectively increasing the contact area between the outer peripheral surface of the first wave arch and the first limiting groove, and effectively forming surface contact. The second wave arch also forms a free end structure by first protruding outward simultaneously in the direction of the second circumferential direction and the radial outer side, then extending simultaneously in the direction of the first circumferential direction and the radial outer side, and finally extending simultaneously in the direction of the second circumferential direction and the radial inner side, which can form three arc surface segments with two bends, effectively increasing the contact area between the outer peripheral surface of the first wave arch and the first limiting groove, and effectively forming surface contact.

[0038] 3. The present invention also arranges the wave arches of two groups of wave arch units adjacent in the axial direction to be axially staggered, which can effectively reduce the end leakage of gas at both ends of the bearing, improve the self - adaptability of the bearing, and enable it to have better load - bearing performance. The present invention also arranges the first limiting groove and the second limiting groove to penetrate through the bearing housing along the axis, which is conducive to the axial flow of gas, thereby effectively improving the heat dissipation efficiency of the gas dynamic pressure bearing.

[0039] 4. The present invention can also adjust the pitch and width of the wave foil arch unit to achieve the distribution adjustment of the wave foil arch unit, change the circumferential and axial stiffness of the elastic component, equalize the stiffness distribution, reduce the depression of the top foil, make the circumferential and axial stiffness more uniform, have better elastic support performance, higher running stability and reliability, and enable the bearing to have better load - bearing performance. Brief Description of the Drawings

[0040] Figure 1 is the axial structure schematic diagram of the gas dynamic pressure bearing of the present invention;

[0041] Figure 2 is Figure 1 the three - dimensional structure schematic diagram of the bearing housing in

[0042] Figure 3 is Figure 1 the three - dimensional structure schematic diagram of the wave foil in

[0043] Figure 4 is the structure schematic diagram after the wave foil and the bearing housing of the present invention are assembled;

[0044] Figure 5 is Figure 1 the three - dimensional structure schematic diagram of the top foil in

[0045] Figure 6 is the partial deformation schematic diagram of the wave foil structure when the gas dynamic pressure bearing of the present invention is running.

[0046] The reference numerals are shown as follows:

[0047] 1. Bearing housing; 1-1. Limit groove; 1-11. First limit groove; 1-12. Second limit groove; 1-2. Fixed groove; 2. Wave foil; 2-0. Wave foil main body; 2-1. Wave arch; 2-11. First wave arch; 2-12. Second wave arch; 2-2. Inner wall of wave foil; 2-3. Free end of wave foil; 3. Top foil; 3-1. Inner wall of top foil; 3-2. Outer wall of top foil; 3-3. Fixed end of top foil; 4. Compressed wave foil; 4-11. Less compressed wave arch; 4-12. More compressed wave arch. Detailed implementation manners

[0048] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way restrictive of the present invention and its application or use. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0049] It should be noted that the terms used herein are only for describing specific implementation manners and are not intended to limit the exemplary implementation manners according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0050] Unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions, and numerical values described in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that for the convenience of description, the dimensions of each part shown in the drawings are not drawn according to the actual proportional relationship. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be interpreted as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0051] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom", etc. is usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description. Without contrary explanations, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the protection scope of the present invention; the orientation words "inner, outer" refer to the inside and outside relative to the contour of each component itself.

[0052] For the convenience of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "upper...", etc. can be used here to describe the spatial positional relationship between a device or feature shown in the figure and other devices or features. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation described in the figure for the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned as "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding explanations are made for the spatial relative descriptions used here.

[0053] In addition, it should be noted that using words such as "first", "second", etc. to limit components is only for the convenience of distinguishing the corresponding components. Without additional statements, the above words have no special meanings. Therefore, it cannot be understood as a limitation on the protection scope of the present invention.

[0054] As Figures 1-6 shown, the present invention provides a gas dynamic pressure bearing, which includes:

[0055] a corrugated foil 2, a top foil 3 and a bearing housing 1. The corrugated foil 2 includes a corrugated foil body 2-0 and a corrugation 2-1. The radially inner end of the corrugation 2-1 is connected to the corrugated foil body 2-0, and the radially outer end of the corrugation 2-1 protrudes towards the bearing housing 1. A limiting groove 1-1 is provided on the inner peripheral wall of the bearing housing 1, and the radially outer end of the corrugation 2-1 can be clamped in the limiting groove 1-1. Through the contact between the inner wall of the limiting groove 1-1 and the radially outer end of the corrugation 2-1, elastic support for the corrugated foil 2 can be formed; the top foil 3 is arranged inside the corrugated foil 2. The corrugated foil 2 has a corrugated foil inner wall 2-2, and a surface contact is formed between the corrugated foil inner wall 2-2 and the top foil 3.

[0056] In the present invention, the wave arch of the wave foil is set to protrude in the radially outward direction, and a matching limiting groove is provided on the inner wall of the bearing housing, so that the radially outer end of the wave arch can be disposed in the limiting groove, thereby enabling the outwardly protruding wave arch to be elastically supported by the limiting groove. Subsequently, it is not necessary to provide a wave arch on the radially inner side of the wave foil, such that the inner wall of the wave foil is a large-area curved surface or arc surface structure, and a surface contact is formed between the inner wall of the wave foil and the top foil, effectively increasing the contact area between the two, increasing the frictional resistance of the bearing, enabling the gas bearing to have sufficient Coulomb friction damping to dissipate redundant energy when subjected to vibration and shock, improving the stability of system operation, and effectively solving the problem that the gas bearing lacks sufficient Coulomb friction damping to dissipate redundant energy when subjected to vibration and shock, resulting in unstable system operation.

[0057] The present invention provides an elastic support assembly and a gas hydrodynamic bearing, aiming to solve the problem that the gas bearing lacks sufficient Coulomb friction damping to dissipate redundant energy when subjected to vibration and shock, resulting in unstable system operation. The present invention designs an elastic assembly with a surface contact method and a bearing housing that cooperates therewith, increasing the contact area and damping between the foils, equalizing the stiffness distribution, and reducing the depression of the top foil.

[0058] In some embodiments,

[0059] The wave arch 2-1 includes a first wave arch 2-11 and a second wave arch 2-12 that bend and extend in different circumferential directions. The limiting grooves 1-1 on the bearing housing 1 include a first limiting groove 1-11 and a second limiting groove 1-12. The first wave arch 2-11 can be clamped in the first limiting groove 1-11, and the second wave arch 2-12 can be clamped in the second limiting groove 1-12. The outer peripheral surface of the first wave arch 2-11 forms a surface contact with the groove wall of the first limiting groove 1-11, and the outer peripheral surface of the second wave arch 2-12 forms a surface contact with the groove wall of the second limiting groove 1-12.

[0060] This is a preferred structural form in which the first and second wave arches and the first and second limiting grooves of the present invention cooperate, enabling the first wave arch to form a clamping fit with the first limiting groove, the second wave arch to form a clamping fit with the second limiting groove, and the outer peripheral surface of the first wave arch to form a surface contact with the groove wall of the first limiting groove, and the outer peripheral surface of the second wave arch to form a surface contact with the groove wall of the second limiting groove, effectively increasing the contact area between the outer peripheral surface of the first wave arch and the first limiting groove, effectively increasing the contact area between the outer peripheral surface of the first wave arch and the first limiting groove, thereby further increasing the frictional resistance of the bearing, enabling the gas bearing to have sufficient Coulomb friction damping to dissipate redundant energy when subjected to vibration and shock, and improving the stability of system operation.

[0061] The corrugated foil 2 of the present invention is composed of multiple supporting corrugated arch units (corrugated arch 2-1), the inner wall 2-2 of the corrugated foil, and the free end 2-3 of the corrugated foil, as Figure 3 shown. The supporting corrugated arch unit includes a first corrugated arch 2-11 (counterclockwise curved corrugated arch) and a second corrugated arch 2-12 (clockwise curved corrugated arch). The corrugated foil 2 is fixed by nesting the corrugated arch 2-1 in the limiting groove 1-1 of the bearing housing 1. Among them, the first corrugated arch 2-11 is nested in the first limiting groove 1-11 in the clockwise direction, and the second corrugated arch 2-12 is nested in the second limiting groove 1-12 in the counterclockwise direction. The notch of the free end 2-3 of the corrugated foil should be aligned with the fixing groove 1-2 of the bearing housing 1 to leave an assembly space for fixing the top foil 3. The assembly drawing of the bearing housing 1 and the corrugated foil 2 is as Figure 4 shown. Compared with the prior art, the corrugated foil 2 of the present invention is integrally formed and has better stiffness characteristics. It can adjust the circumferential support stiffness distribution of the bearing by changing the pitch of the corrugated arch unit, and adjust the axial support stiffness distribution of the bearing by changing the width and the number of rows of the corrugated arch, reduce the end leakage of the gas at both ends of the bearing, improve the self-adaptability of the bearing, and enable it to have better load-bearing performance; the inner wall of the corrugated foil 2-2 is a curved surface or a flat surface. When contacting the top foil 3, the line contact in the prior art is changed to surface contact, which not only greatly reduces the phenomenon of top foil depression, but also increases the bearing damping, effectively suppressing the self-excited whirling and low-frequency whirling of the bearing rotor system, enabling the gas dynamic pressure bearing to have better anti-vibration and anti-impact characteristics, and increasing the service life of the bearing.

[0062] In some embodiments,

[0063] the first corrugated arch 2-11 is a curved surface corrugated arch. One end of the first corrugated arch 2-11 is connected to the corrugated foil main body 2-0. The other end of the first corrugated arch 2-11 first extends outward simultaneously in the first circumferential direction and the radial outer direction, then extends simultaneously in the second circumferential direction and the radial outer direction, and finally extends simultaneously in the second circumferential direction and the radial inner direction to form a free end;

[0064] the second corrugated arch 2-12 is also a curved surface corrugated arch. One end of the second corrugated arch 2-12 is connected to the corrugated foil main body 2-0. The other end of the second corrugated arch 2-12 first extends outward simultaneously in the second circumferential direction and the radial outer direction, then extends simultaneously in the first circumferential direction and the radial outer direction, and finally extends simultaneously in the first circumferential direction and the radial inner direction to form a free end;

[0065] wherein the first circumferential direction and the second circumferential direction are opposite directions.

[0066] In the present invention, the first wave arch first protrudes outward simultaneously in the direction of the first circumferential direction and the radial outer side, then extends simultaneously in the direction of the second circumferential direction and the radial outer side, and finally extends simultaneously in the direction of the second circumferential direction and the radial inner side to form the structure of the free end, which can form three arc surface segments after two bends, effectively increasing the contact area between the outer peripheral surface of the first wave arch and the first limiting groove, and effectively forming surface contact; the second wave arch first protrudes outward simultaneously in the direction of the second circumferential direction and the radial outer side, then extends simultaneously in the direction of the first circumferential direction and the radial outer side, and finally extends simultaneously in the direction of the second circumferential direction and the radial inner side to form the structure of the free end, which can form three arc surface segments after two bends, effectively increasing the contact area between the outer peripheral surface of the first wave arch and the first limiting groove, and effectively forming surface contact; further increasing the frictional resistance of the bearing, improving the Coulomb friction damping dissipation of redundant energy when the gas bearing is subjected to vibration and impact, and further improving the stability of the system operation.

[0067] When the gas dynamic pressure bearing of the present invention works, the wave foil 2 and the top foil 3 of the bearing elastic component undergo elastic deformation under the action of the air film pressure or external force, as Figure 6 shown. Different air film regions correspond to different air film pressures, and the deformation of the wave foil 4 after being pressed is also different. The wave arch 2-1 corresponding to the air film region with a larger force moves circumferentially and generates a larger deformation. The wave arch 4-12 with a larger pressure will form surface contact inside the limiting groove 1-1 of the bearing seat 1. The greater the force, the larger the contact area, further increasing the bearing damping and realizing the buffering and dispersion of external forces. The wave arch 2-1 corresponding to the air film region with a smaller force generates a small displacement, and the wave arch 4-11 with a smaller pressure only makes partial contact with the limiting groove 1-1 of the bearing seat 1. Therefore, the bearing has strong adaptability to different loads, keeps the rotor in a stable motion state all the time, and has higher running stability and reliability.

[0068] In some embodiments,

[0069] The first wave arch 2-11 and the second wave arch 2-12 form a group of wave arch units;

[0070] In the circumferential direction, there are multiple groups of the wave arch units, and the multiple groups of wave arch units are arranged at intervals in the circumferential direction; and / or, along the axial direction of the wave foil 2, there are also multiple groups of the wave arch units, and the multiple groups of wave arch units are arranged at intervals in the axial direction.

[0071] Through the arrangement of multiple groups of wave arch units, the present invention can increase the contact area with the bearing housing, improve the elastic support for the wave arch, and further improve the support performance for the top foil on the inner circumference of the wave foil and even the rotor. Multiple groups of wave arch units can be arranged at intervals in the circumferential direction or multiple groups can be arranged at intervals in the axial direction, so as to increase the support area on the entire outer circumference of the wave foil and further improve the support performance of the bearing.

[0072] In some embodiments,

[0073] When there are also multiple groups of wave arch units along the axial direction of the wave foil 2, the wave arches of two adjacent groups of wave arch units in the axial direction are staggered along the axial direction; and the wave arches of multiple groups of wave arch units along the axial direction are alternately arranged in sequence.

[0074] The present invention also effectively reduces the end leakage of gas at both ends of the bearing and improves the self - adaptability of the bearing, enabling it to have better load - bearing performance by staggering the wave arches of two adjacent groups of wave arch units in the axial direction; the alternate arrangement in sequence of the wave arches of multiple groups of wave arch units along the axial direction can further reduce the end leakage at both ends of the bearing (the wave arches that tilt outwards can block the flow of air).

[0075] The present invention provides an elastic support assembly and a gas dynamic pressure bearing, as Figure 1 shown, which is composed of a bearing housing 1, a wave foil 2, and a top foil 3. Among them, the wave foil 2 and the top foil 3 are the elastic support components of the bearing. The wave foil 2 is evenly distributed with multiple support wave arch units along the circumferential direction and is staggered in the axial direction. It is installed and nested on the inner wall of the bearing housing 1. The top foil 3 is stacked on the wave foil 2 and inserted into the fixed groove of the bearing housing 1. The inner wall of the top foil provides a lubricating surface for the working gas film.

[0076] In some embodiments,

[0077] The first wave arch 2 - 11 and the second wave arch 2 - 12 are connected by the wave foil body 2 - 0; and / or, the first wave arch 2 - 11 and the second wave arch 2 - 12 are spaced apart and not connected, and are connected by the wave foil body 2 - 0 between two adjacent circumferential wave arch units;

[0078] Among two adjacent groups of wave arch units in the axial direction, the first wave arch 2 - 11 and the second wave arch 2 - 12 of one group of wave arch units are connected by the wave foil body 2 - 0; the first wave arch 2 - 11 and the second wave arch 2 - 12 of the other group of wave arch units are spaced apart and not connected, and are connected by the wave foil body 2 - 0 between two adjacent circumferential wave arch units.

[0079] This is a further preferred structural form of the first wave arch and the second wave arch of the present invention. That is, the first and second wave arches can be connected through the wave foil body, or the first and second wave arches can be set to be spaced apart and not connected. However, in the first and second wave arches that are spaced apart and not connected, the adjacent wave arch units are connected through the wave foil body. And in two sets of axially adjacent wave arch units, one set is formed such that the first and second wave arches are connected through the wave foil body, and the other set is formed such that the first and second wave arches are spaced apart and not connected, thereby forming a wave arch structure arranged alternately in the axial direction, increasing the resistance to gas, and further reducing the end leakage effect of the bearing.

[0080] In some embodiments,

[0081] The circumferential distance between the first wave arch 2-11 and the second wave arch 2-12 connected by the wave foil body 2-0 is greater than the circumferential distance between the first wave arch 2-11 and the second wave arch 2-12 that are spaced apart and not connected; and / or,

[0082] The free ends of the first wave arch 2-11 and the second wave arch 2-12 connected by the wave foil body 2-0 protrude relatively and are spaced apart by a preset distance greater than 0; the free ends of the first wave arch 2-11 and the second wave arch 2-12 that are not connected protrude away from each other.

[0083] This is a further preferred structural form between the first and second wave arches of the present invention. That is, the distance between the first and second wave arches connected by the wave foil body is greater than the distance between the first and second wave arches arranged at intervals, which can effectively form a wave arch structure arranged alternately in the axial direction, increasing the resistance to gas, and further reducing the end leakage effect of the bearing. And the free ends of the first and second wave arches arranged at intervals protrude in opposite directions. Since the two wave arches are relatively close, protruding in opposite directions can provide enough space for setting the wave arches. The first and second wave arches connected by the wave foil body protrude in opposite directions, which can provide enough space for setting, and at the same time, this extension method can further enhance the blocking area of the airflow in the circumferential direction, ensuring that there is enough resistance to the gas flowing in the axial direction, and further improving the performance of reducing the end leakage of the bearing.

[0084] In some embodiments,

[0085] The first limiting groove 1-11 penetrates through the bearing seat 1 along the axial direction of the bearing seat, and the second limiting groove 1-12 penetrates through the bearing seat 1 along the axial direction of the bearing seat;

[0086] When the first wave arch 2-11 and the second wave arch 2-12 form a set of wave arch units, and there are multiple sets of wave arch units in the circumferential direction, there are also multiple first limiting grooves 1-11 in the circumferential direction, and the first limiting grooves 1-11 are arranged in one-to-one correspondence with the first wave arches 2-11. There are also multiple second limiting grooves 1-12 in the circumferential direction, and the second limiting grooves 1-12 are arranged in one-to-one correspondence with the second wave arches 2-12.

[0087] The present invention also has the first limiting groove and the second limiting groove penetrating through the bearing seat along the axial direction, which is beneficial to the axial flow of gas, thereby effectively improving the heat dissipation efficiency of the gas dynamic pressure bearing; the multiple first and second limiting grooves are arranged in one-to-one correspondence with the multiple first and second wave arches, which can increase the clamping area of the wave arches, improve the elastic support performance of the wave arches, and improve the support performance of the bearing.

[0088] In some embodiments,

[0089] The circumferential distance between the circumferential end of the first wave arch 2-11 and the circumferential end of the second wave arch 2-12 is the pitch of the wave arch unit, and the pitch can be adjusted; in the axial direction of the wave foil 2, the axial dimension of the wave arch unit is the width of the wave arch unit, the number of groups of the wave arch unit is the number of divided columns, and the width and the number of divided columns of the wave arch unit can be adjusted respectively.

[0090] The present invention also realizes the distribution adjustment of the wave foil arch unit by adjusting the pitch and width of the wave foil arch unit, can change the circumferential and axial stiffness of the elastic component, equalize the stiffness distribution, reduce the depression of the top foil, make the circumferential and axial stiffness more uniform, have better elastic support performance, higher operation stability and reliability, and make the bearing have better load-bearing performance.

[0091] The elastic component of the present invention is in surface contact, increasing the friction damping of the bearing, adjusting the distribution of the wave foil arch unit, making the circumferential and axial stiffness more uniform, and having better elastic support performance, higher operation stability and reliability.

[0092] In some embodiments,

[0093] The outer peripheral surface of the first wave arch 2-11 is an arc surface, the inner wall of the first limiting groove 1-11 is also an arc surface, the outer peripheral surface of the second wave arch 2-12 is an arc surface, and the inner wall of the second limiting groove 1-12 is also an arc surface; in the axial projection plane of the wave foil 2, the first wave arch 2-11 is a counterclockwise bending wave arch, the second wave arch 2-12 is a clockwise bending wave arch, the first limiting groove 1-11 is a counterclockwise limiting groove, and the second limiting groove 1-12 is a clockwise limiting groove.

[0094] This is a further preferred structural form of the first wave arch, the first limiting groove, the second wave arch, and the second limiting groove of the present invention, that is, they are all formed into arc-shaped surfaces, which can increase the contact area between the wave arch and the limiting groove, form surface contact, and further increase the supporting area while improving the supporting effect; the first and second wave arches are bent in different circumferential directions to form counterclockwise and clockwise bent wave arches respectively, and the first and second limiting grooves are also bent in different circumferential directions to form counterclockwise and clockwise bent limiting grooves respectively; the wave arches and limiting grooves extending in different circumferential directions can effectively increase the contact area in the circumferential direction, improve the bearing area, and can increase the blocking area for gas in the axial direction, further reducing end leakage; and the wave arch of the present invention is formed into a cantilever end, which can further improve the elastic support performance.

[0095] The bearing seat 1 of the present invention is provided with a plurality of limiting grooves 1-1 and a fixing groove 1-2, as Figure 2 shown, the limiting groove 1-1 includes a first limiting groove 1-11 (clockwise limiting groove) and a second limiting groove 1-12 (counterclockwise limiting groove). Compared with the prior art, the bearing seat 1 of the present invention has better versatility. When the pitch of the wave arch unit of the wave foil 2 changes, it can be fixed by being embedded in the limiting grooves at different positions, and can be recycled and reused, reducing the production cost; in addition, the axially penetrating limiting grooves 1-1 distributed circumferentially are beneficial to the axial flow of gas, improving the heat dissipation efficiency of the bearing.

[0096] In some embodiments,

[0097] On the inner wall of the bearing seat 1, there is a fixing groove 1-2 recessed toward the radially outer side. At the circumferential end of the wave foil 2 where there is no wave arch, there is a wave foil free end 2-3 protruding toward the radially outer side. At the circumferential end of the wave foil 2 where there is a wave arch, there is a notch opposite to the fixing groove 1-2. At the circumferential end of the top foil 3, there is a top foil fixed end 3-3 protruding toward the radially outer side. The wave foil free end 2-3 and the top foil fixed end 3-3 are integrally inserted into the fixing groove 1-2 to form the fixation of the wave foil 2 and the top foil 3.

[0098] The present invention can form a plug-in fit through the fixing groove on the bearing seat, the wave foil free end on the wave foil, and the top foil fixed end on the top foil, so as to achieve the effect of fixing the circumferential ends of the wave foil and the top foil to the bearing seat; by forming a notch at the position where the wave arch is provided on the wave foil, it can be opposite to the fixing groove, facilitating the insertion of the top foil fixed end into the fixing groove to form a fixation.

[0099] The top foil 3 of the present invention includes a top foil inner wall 3-1, a top foil outer wall 3-2, and a top foil fixed end 3-3, as Figure 5As shown, the inner wall 3-1 of the top foil contacts the rotor, providing a lubricating surface for the working gas film. The outer wall 3-2 of the top foil is stacked on the inner wall 2-2 of the corrugated foil, and the two are in surface contact. The fixed end 3-3 of the top foil is installed in the fixed groove 1-2 of the bearing housing 1, and is limited by the protruding part of the free end 2-3 of the corrugated foil through the fixed groove 1-2, reducing the number of limiting components, such as Figure 1 as shown.

[0100] The present invention also provides a motor, which includes the aforementioned gas dynamic pressure bearing.

[0101] The inventive point of the present invention lies in:[[]]

[0102] 1. The corrugated foil is fixed by being embedded in the bearing housing. The corrugated foil is in surface contact with both the bearing housing and the top foil, enabling the bearing to have better damping performance;

[0103] 2. By adjusting the pitch and width of the corrugated foil arch unit, the circumferential and axial stiffness of the elastic component can be changed, enabling the bearing to have better load-bearing performance;

[0104] 3. A bearing housing structure is proposed to fix the corrugated foil, protecting the bearing and reducing the number of limiting components.

[0105] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. The above is only the preferred implementation manner of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and modifications can still be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A gas dynamic pressure bearing, characterized in that: Comprising: A corrugated foil (2), a top foil (3) and a bearing housing (1), wherein the corrugated foil (2) includes a corrugated foil body (2-0) and corrugations (2-1), the radially inner end of the corrugations (2-1) is connected to the corrugated foil body (2-0), the radially outer end of the corrugations (2-1) protrudes towards the bearing housing (1), a limiting groove (1-1) is provided on the inner peripheral wall of the bearing housing (1), the radially outer end of the corrugations (2-1) can be clamped in the limiting groove (1-1), and elastic support for the corrugated foil (2) can be formed through the contact between the inner wall of the limiting groove (1-1) and the radially outer end of the corrugations (2-1); the top foil (3) is arranged on the inner circumference of the corrugated foil (2), and the corrugated foil (2) has a corrugated foil inner wall (2-2), and a surface contact is formed between the corrugated foil inner wall (2-2) and the top foil (3).

2. The gas dynamic pressure bearing according to claim 1, characterized in that: The corrugations (2-1) include a first corrugation (2-11) and a second corrugation (2-12) that bend and extend in different circumferential directions, the limiting groove (1-1) on the bearing housing (1) includes a first limiting groove (1-11) and a second limiting groove (1-12), the first corrugation (2-11) can be clamped in the first limiting groove (1-11), and the second corrugation (2-12) can be clamped in the second limiting groove (1-12); a surface contact is formed between the outer peripheral surface of the first corrugation (2-11) and the groove wall of the first limiting groove (1-11), and a surface contact is formed between the outer peripheral surface of the second corrugation (2-12) and the groove wall of the second limiting groove (1-12).

3. The gas dynamic pressure bearing according to claim 2, characterized in that: The first corrugation (2-11) is a curved surface corrugation, one end of the first corrugation (2-11) is connected to the corrugated foil body (2-0), the other end of the first corrugation (2-11) first extends outwards simultaneously in the first circumferential direction and the radially outer direction, then extends simultaneously in the second circumferential direction and the radially outer direction, and finally extends simultaneously in the second circumferential direction and the radially inner direction to form a free end; The second corrugation (2-12) is also a curved surface corrugation, one end of the second corrugation (2-12) is connected to the corrugated foil body (2-0), the other end of the second corrugation (2-12) first extends outwards simultaneously in the second circumferential direction and the radially outer direction, then extends simultaneously in the first circumferential direction and the radially outer direction, and finally extends simultaneously in the first circumferential direction and the radially inner direction to form a free end; wherein the first circumferential direction and the second circumferential direction are opposite directions.

4. The gas dynamic pressure bearing according to claim 2, characterized in that: The first corrugation (2-11) and the second corrugation (2-12) form a set of corrugation units; In the circumferential direction, there are multiple groups of the wave arch units, and the multiple groups of wave arch units are arranged at intervals in the circumferential direction; and / or, along the axial direction of the wave foil (2), there are also multiple groups of the wave arch units, and the multiple groups of wave arch units are arranged at intervals in the axial direction.

5. The hydrodynamic gas bearing according to claim 4, wherein: When there are multiple groups of the wave arch units along the axial direction of the wave foil (2), the wave arches of two adjacent groups of wave arch units in the axial direction are arranged with an axial stagger; and the wave arches of multiple groups of wave arch units are arranged in a staggered manner in sequence along the axial direction.

6. The hydrodynamic gas bearing according to claim 5, wherein: The first wave arch (2-11) and the second wave arch (2-12) are connected by the wave foil main body (2-0); and / or, the first wave arch (2-11) and the second wave arch (2-12) are spaced apart and not connected, and the wave foil main body (2-0) is connected between two adjacent circumferential wave arch units; Among two adjacent groups of wave arch units in the axial direction, the first wave arch (2-11) and the second wave arch (2-12) of one group of wave arch units are connected by the wave foil main body (2-0); the first wave arch (2-11) and the second wave arch (2-12) of the other group of wave arch units are spaced apart and not connected, and the wave foil main body (2-0) is connected between two adjacent circumferential wave arch units.

7. The hydrodynamic gas bearing according to claim 6, wherein: The circumferential spacing between the first wave arch (2-11) and the second wave arch (2-12) connected by the wave foil main body (2-0) is greater than the circumferential spacing between the first wave arch (2-11) and the second wave arch (2-12) that are spaced apart and not connected; and / or, The free ends of the first wave arch (2-11) and the second wave arch (2-12) connected by the wave foil main body (2-0) extend relatively and are spaced apart by a preset distance greater than 0; the free ends of the non-connected first wave arch (2-11) and the second wave arch (2-12) extend away from each other.

8. The hydrodynamic gas bearing according to claim 5, wherein: The first limiting groove (1-11) penetrates through the bearing housing (1) along the axial direction of the bearing housing, and the second limiting groove (1-12) penetrates through the bearing housing (1) along the axial direction of the bearing housing; When the first wave arch (2-11) and the second wave arch (2-12) form a group of wave arch units and there are multiple groups of the wave arch units in the circumferential direction, the first limiting groove (1-11) is also multiple in the circumferential direction, and the first limiting groove (1-11) is arranged in one-to-one correspondence with the first wave arch (2-11), the second limiting groove (1-12) is also multiple in the circumferential direction, and the second limiting groove (1-12) is arranged in one-to-one correspondence with the second wave arch (2-12).

9. The hydrodynamic gas bearing according to claim 4, wherein: The circumferential distance between the circumferential end of the first wave arch (2-11) and the circumferential end of the second wave arch (2-12) is the pitch of the wave arch unit, and the pitch can be adjusted; in the axial direction of the wave foil (2), the axial dimension of the wave arch unit is the width of the wave arch unit, the number of groups of the wave arch units is the number of dividing lines, and the width of the wave arch unit and the number of dividing lines can be adjusted respectively.

10. The aerodynamic bearing according to any one of claims 2-9, characterized in that: The outer circumferential surface of the first wave arch (2-11) is an arc surface, the inner wall of the first limiting groove (1-11) is also an arc surface, the outer circumferential surface of the second wave arch (2-12) is an arc surface, and the inner wall of the second limiting groove (1-12) is also an arc surface; in the axial projection plane of the wave foil (2), the first wave arch (2-11) is a counterclockwise curved wave arch, the second wave arch (2-12) is a clockwise curved wave arch, the first limiting groove (1-11) is a counterclockwise limiting groove, and the second limiting groove (1-12) is a clockwise limiting groove.

11. The aerodynamic bearing according to any one of claims 1-10, characterized in that: A fixing groove (1-2) recessed towards the radially outer side is provided on the inner wall of the bearing housing (1). The wave foil free end (2-3) protruding towards the radially outer side is provided at a position where no wave arch is provided at the circumferential end of the wave foil (2). A notch opposite to the fixing groove (1-2) is provided at a position where the wave arch is provided at the circumferential end of the wave foil (2). The top foil fixing end (3-3) protruding towards the radially outer side is provided at the circumferential end of the top foil (3). The wave foil free end (2-3) and the top foil fixing end (3-3) are integrally inserted into the fixing groove (1-2) to form the fixation of the wave foil (2) and the top foil (3).

12. A motor, characterized in that: Comprising the aerodynamic bearing according to any one of claims 1-11.

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