Three-lobe bump foil type radial bearing
By using a three-lobed corrugated foil radial bearing structure, the problems of high stress and jamming caused by the small deformation of the integral corrugated foil are solved, achieving a larger deformation and stable rotor support effect, and improving the service life and operational stability of the bearing.
Patent Information
- Application Number
- CN202322438115.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-09-08
- Publication Date
- 2026-02-27
- Estimated Expiration
- 2033-09-08
AI Technical Summary
The small deformation of the integral corrugated foil leads to high stress, flexural deformation, and easy jamming, resulting in a loss of support for the rotor.
The bearing adopts a three-lobed corrugated foil radial bearing structure. There are a first corrugated foil, a second corrugated foil and a third corrugated foil between the top foil and the bearing housing. The two ends of each corrugated foil are free ends and are all integrally stamped. The original curvature of the corrugated foil is greater than that of the assembled state. It is installed in the groove of the bearing housing and a retaining ring is provided at both ends of the bearing housing to limit the displacement. The inner surface of the top foil is sprayed with a wear-resistant coating.
The increased deformation of the corrugated foil prevents jamming, ensures the formation of the air film, provides stable rotor support, and improves bearing life and operational stability.
Smart Images
Figure CN223953075U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to air bearing technical field especially relates to a three labium wave foil type radial bearing. BACKGROUND
[0002] The radial air bearing is supported by the compression effect of the wedge-shaped gap gas film between the top foil and the rotor for high-speed operation, mainly including the bearing seat, the wave foil and the top foil, wherein the wave foil and the top foil are generally in the integral structure, the wave foil in the integral structure has small deformation, when local deformation occurs, stress or flexural deformation of the whole wave foil is caused, resulting in that the whole wave foil cannot be used, when being pressed by the rotor, the integral wave foil cannot be adjusted by relying on the shape change, and the situation of being stuck easily occurs, so that the gas film cannot be formed, and the supporting effect on the rotor is lost.
[0003] In summary, the small deformation of the wave foil in the radial air bearing has become a technical problem to be solved in the industry. UTILITY MODEL CONTENTS
[0004] The utility model provides a three labium wave foil type radial bearing to make up for the shortage of prior art, solve the problem of big stress, flexural deformation and easy sticking of the previous integral wave foil due to small deformation.
[0005] The utility model provides a three labium wave foil type radial bearing to make up for the shortage of prior art, solve the previous integral wave foil due to small deformation.
[0006] A three labium wave foil type radial bearing, including the top foil that is integrally arranged in the ring, the both ends of the top foil are free ends and are equipped with top foil constraint edge, the top foil is installed in the bearing seat, the top foil constraint edge of the both ends of the top foil is respectively movably inserted in the first recess and the second recess in the bearing seat, the first wave foil, the second wave foil and the third wave foil are pre-tightening assembly between the top foil and the bearing seat, and the one end of the first wave foil, the second wave foil and the third wave foil is equipped with wave foil constraint edge, and the other end is free end, the wave foil constraint edge of the first wave foil is movably inserted in the second recess, the wave foil constraint edge of the second wave foil is movably inserted in the third recess, the wave foil constraint edge of the third wave foil is movably inserted in the fourth recess, and the second recess, the third recess and the fourth recess are evenly distributed on the inner wall of the bearing seat along the circumference.
[0007] The middle wave of the first wave foil, the second wave foil and the third wave foil is high, and the wave on both sides is low.
[0008] The original radian of the first wave foil, the second wave foil and the third wave foil is greater than the radian in the actual assembly state.
[0009] The first wave foil, the second wave foil, the third wave foil and the top foil are integrally stamped.
[0010] The first groove and the second groove are arranged close to each other.
[0011] The first groove, the second groove, the third groove and the fourth groove are respectively arranged through the inner wall of the bearing seat in the axial direction.
[0012] The inner side of the two ends of the bearing seat is respectively provided with a check ring for limiting the axial displacement of the top foil, the first wave foil, the second wave foil and the third wave foil.
[0013] The inner surface of the top foil is sprayed with a wear-resistant coating.
[0014] The wear-resistant coating comprises a molybdenum disulfide coating or a polytetrafluoroethylene coating.
[0015] The utility model discloses the above-mentioned scheme has the following advantages:
[0016] By being provided with the first wave foil, the second wave foil and the third wave foil between the top foil and the bearing seat, the two ends of the top foil, the first wave foil, the second wave foil and the third wave foil are all free ends, which is easier to assemble and has a larger deformation amount, when a piece of wave foil is stressed, another piece of wave foil will not be affected, and the overall use is not affected, when the first wave foil, the second wave foil or the third wave foil is pressed by the rotor, can rely on the deformation of itself to adjust, avoid the situation of being stuck, beneficial to the formation of gas film, guarantee the support effect to the rotor. BRIEF DESCRIPTION OF DRAWINGS
[0017] Figure 1 It is the three-dimensional structure schematic diagram of the utility model.
[0018] Figure 2 It is the structure schematic diagram of single piece wave foil of the utility model.
[0019] Figure 3 It is the structure schematic diagram of being installed in the bearing seat of the utility model.
[0020] Figure 4 It is the longitudinal section structure schematic diagram of Figure 3 .
[0021] Figure 5 It is the transverse section structure schematic diagram of Figure 3 .
[0022] In the drawing, 1, top foil, 2, top foil constraint edge, 3, bearing seat, 4, first groove, 5, second groove, 6, first wave foil, 7, second wave foil, 8, third wave foil, 9, wave foil constraint edge, 10, third groove, 11, fourth groove, 12, check ring. DETAILED DESCRIPTION
[0023] In order to clearly illustrate the technical features of the scheme, the utility model is described in detail below through specific implementation mode, and is combined with its drawings.
[0024] As shown in Figures 1-5 A three-cusp wave foil radial bearing, comprising a top foil 1 arranged in a ring shape, both ends of the top foil 1 are free ends and provided with top foil restraint edges 2, the top foil 1 is installed in a bearing seat 3, the top foil restraint edges 2 at both ends of the top foil 1 are respectively movably inserted into a first groove 4 and a second groove 5 in the bearing seat 3, and a first wave foil 6, a second wave foil 7 and a third wave foil 8 are arranged along the circumference between the top foil 1 and the bearing seat 3, each wave foil is pre-tightened and assembled between the top foil 1 and the bearing seat 3, one end of each of the first wave foil 6, the second wave foil 7 and the third wave foil 8 is provided with a wave foil restraint edge 9, and the other end is a free end, the wave foil restraint edge 9 of the first wave foil 6 is movably inserted into the second groove 5, the wave foil restraint edge 9 of the second wave foil 7 is movably inserted into a third groove 10, and the wave foil restraint edge 9 of the third wave foil 8 is movably inserted into a fourth groove 11, and the second groove 5, the third groove 10 and the fourth groove 11 are distributed along the inner wall of the bearing seat 3.
[0025] The middle wave height of the first wave foil 6, the second wave foil 7 and the third wave foil 8 is higher, and the wave height on both sides is lower.
[0026] The original curvature of the first wave foil 6, the second wave foil 7 and the third wave foil 8 is greater than the actual assembly state curvature, and after assembly is completed, the first wave foil 6, the second wave foil 7 and the third wave foil 8 are tightly attached to the bearing seat 3 on the outside and closely matched with the top foil 1 on the inside under the constraint of the top foil 1.
[0027] The first wave foil 6, the second wave foil 7, the third wave foil 8 and the top foil 1 are integrally formed by stamping.
[0028] The first groove 4 and the second groove 5 are arranged close to each other, and the first groove 4, the second groove 5, the third groove 10 and the fourth groove 11 are used to constrain the radial rotation of the top foil 1 and the wave foils.
[0029] The first groove 4, the second groove 5, the third groove 10 and the fourth groove 11 are respectively arranged along the axial direction and penetrate the inner wall of the bearing seat 3.
[0030] The inner sides of both ends of the bearing seat 3 are respectively provided with a stop ring 12 for limiting the axial displacement of the top foil 1, the first wave foil 6, the second wave foil 7 and the third wave foil 8.
[0031] The inner surface of the top foil 1 is sprayed with a wear-resistant coating, and the wear-resistant coating comprises a molybdenum disulfide coating or a polytetrafluoroethylene coating, which can reduce wear and improve service life.
[0032] In the assembly of this invention, the first corrugated foil 6 is inserted into the second groove 5, the second corrugated foil 7 is inserted into the third groove 10, and the third corrugated foil 8 is inserted into the fourth groove 11. Then, the top foil constraint edges 2 at both ends of the top foil 1 are inserted into the first groove 4 and the second groove 5 respectively. Finally, the retaining rings 12 are installed on the inner sides of both ends of the bearing housing 3. The top foil 1, the first corrugated foil 6, the second corrugated foil 7, and the third corrugated foil 8 are all free ends, making assembly easier and allowing for greater deformation. When one corrugated foil is subjected to stress, the other corrugated foil remains unaffected, ensuring overall usability. When the radial air bearing operates, the first corrugated foil 6, the second corrugated foil 7, and the third corrugated foil 8 undergo slight elastic deformation under the action of the air film. The first corrugated foil 6, the second corrugated foil 7, and the third corrugated foil 8 slide slightly between the bearing housing 3 and the top foil 1, providing sufficient damping for high-speed bearing operation and supporting the central rotor to ensure rotor stability. When the first foil 6, the second foil 7, or the third foil 8 are compressed by the rotor, they can adjust themselves by their own deformation to avoid jamming and facilitate the formation of the gas film.
[0033] The above specific embodiments should not be construed as limiting the scope of protection of this utility model. For those skilled in the art, any alternative improvements or modifications made to the embodiments of this utility model shall fall within the scope of protection of this utility model.
[0034] Any aspects of this utility model not described in detail are known to those skilled in the art.
Claims
1. A tri-lobe foil radial bearing characterized by: The top foil is integrally arranged in a ring shape, both ends of the top foil are free ends and provided with top foil constraint edges, the top foil is installed in the bearing seat, the top foil constraint edges of both ends of the top foil are movably inserted in the first groove and the second groove in the bearing seat respectively, the first wave foil, the second wave foil and the third wave foil are provided between the top foil and the bearing seat, each wave foil is pre-tightening assembled between the top foil and the bearing seat, one end of the first wave foil, the second wave foil and the third wave foil is provided with a wave foil constraint edge, the other end is a free end, the wave foil constraint edge of the first wave foil is movably inserted in the second groove, the wave foil constraint edge of the second wave foil is movably inserted in the third groove, the wave foil constraint edge of the third wave foil is movably inserted in the fourth groove, the second groove, the third groove and the fourth groove are distributed on the inner wall of the bearing seat along the circumference.
2. A triad foil radial bearing according to claim 1, characterized in that: The middle wave height of the first wave foil, the second wave foil and the third wave foil is higher, and the wave height on both sides is lower.
3. A triad foil radial bearing according to claim 1, wherein: The original curvature of the first wave foil, the second wave foil and the third wave foil is greater than the curvature in the actual assembly state.
4. A triad foil radial bearing according to claim 1, wherein: The first wave foil, the second wave foil, the third wave foil and the top foil are integrally stamped and formed.
5. A triad foil radial bearing according to claim 1, wherein: The first groove and the second groove are arranged close to each other.
6. A triad foil radial bearing according to claim 1, wherein: The first groove, the second groove, the third groove and the fourth groove are respectively provided on the inner wall of the bearing seat along the axial direction.
7. A triad foil radial bearing according to claim 1, wherein: The inner side of both ends of the bearing seat is respectively provided with a stop ring for limiting the axial displacement of the top foil, the first wave foil, the second wave foil and the third wave foil.
8. A triad foil radial bearing according to claim 1, wherein: The inner surface of the top foil is sprayed with a wear-resistant coating.
9. A triad foil radial bearing according to claim 8, wherein: The wear-resistant coating includes a molybdenum disulfide coating or a polytetrafluoroethylene coating.