Dynamic pressure air radial bearing with independently distributed wave arch
By introducing an independently distributed wave arch structure into the air bearing, the problem of difficult change in traditional bearing stiffness is solved, and the bearing is highly stable and flexible, and the bearing is designed to meet the needs of different working conditions.
Patent Information
- Application Number
- CN202422697559.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-05
- Publication Date
- 2025-08-05
- Estimated Expiration
- 2034-11-05
AI Technical Summary
The bearing stiffness of traditional foil air bearings in the circumferential and axial directions is difficult to change, resulting in insufficient bearing stability.
A wave arch independent distributed dynamic pressure air radial bearing is designed. By setting independent wave foil strips and top foil strips on the inner circle of the bearing seat, a semi-enclosed wave arch groove is opened on the wave foil strips. Each wave arch assembly is composed of arc wave archs, connecting plates and supporting plates. The wave archs are independently distributed to improve the stability of the bearing.
The stability of dynamic pressure air radial bearings is significantly improved, and the circumferential and axial bearing capacity, stiffness and damping of the bearings can be flexibly designed according to the rotor working conditions, ensuring more stable operation of the rotor.
Smart Images
Figure CN223190831U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to an air bearing, and specifically discloses a wave-arch independent distributed dynamic pressure air radial bearing. Background Art
[0002] Traditional foil air bearings consist of one or more tile-shaped elastic wave foils, fixed at one end and free at the other, and one or more top foils, also fixed at one end and free at the other. The support stiffness of the wave foil in the circumferential and axial directions is difficult to adjust. While the wave foil can be divided into several strips along the circumference, and adjusting the structure of each wave arch can somewhat modify the axial stiffness, it still cannot be arbitrarily designed. Summary of the Invention
[0003] The purpose of the utility model is to overcome the deficiencies in the prior art and provide a wave-arch independent distributed dynamic pressure air radial bearing which can significantly improve stability.
[0004] According to the technical solution provided by the utility model, the wave arch independent distributed dynamic pressure air radial bearing includes a bearing seat, a wave foil strip and a top foil strip;
[0005] A foil mounting groove is provided on the inner circle of the bearing seat;
[0006] The number of the bump foil strips is equal to the number of the foil strip installation slots. The bump foil strips include a bump foil strip installation head and a bump foil strip body connected to the bump foil strip installation head. The bump foil strip installation head of the bump foil strip is installed in the foil strip installation slot, and the bump foil strip body is a free end.
[0007] The top foil strip includes a top foil strip installation head and a top foil strip body connected to the top foil strip installation head. The top foil strip body is a smooth foil strip bent into an arc shape. The top foil strip installation head of the top foil strip is installed in the foil strip installation groove. The top foil strip body is a free end and is located inside the corrugated foil strip body.
[0008] The corrugated foil body is provided with a plurality of independent and semi-enclosed corrugated arch grooves. The portion of the corrugated foil body surrounded by each corrugated arch groove forms a corrugated arch assembly. Each corrugated arch assembly includes an arc-shaped corrugated arch, a corrugated arch connecting piece connected to one side of the corrugated arch, and a corrugated arch supporting piece connected to the other side of the corrugated arch. The corrugated arch connecting piece is connected to the corrugated foil body between two adjacent corrugated arch grooves.
[0009] The outer circle of the corrugated foil strip body outside the corrugated arch groove contacts the inner circle of the bearing seat, and the arc top of the corrugated arch contacts the outer circle of the top foil strip body.
[0010] Preferably, the corrugated arch connecting piece faces the corrugated foil strip installation head.
[0011] Preferably, the wave arch groove is Π-shaped.
[0012] The utility model has the following advantages:
[0013] 1. Since the wave arches in the utility model are independent of each other, they do not interfere with each other during operation and deformation, which significantly improves the stability of the dynamic pressure air radial bearing.
[0014] 2. Since the position of the wave arch can be arbitrarily distributed and the size of the wave arch can be freely designed, the bearing capacity, stiffness and damping in the circumferential and axial directions can be designed specifically according to the rotor working conditions, making the rotor operation more stable. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is a structural diagram of the present utility model.
[0016] Figure 2 It is a three-dimensional diagram of the first type of corrugated foil in the utility model.
[0017] Figure 3 This is an expanded view of the first type of corrugated foil in the present invention.
[0018] Figure 4 yes Figure 3 Magnified view of part A in FIG.
[0019] Figure 5 It is a three-dimensional diagram of the second type of corrugated foil in the present invention.
[0020] Figure 6 It is an expanded view of the second type of corrugated foil in the present invention.
[0021] Figure 7 yes Figure 6 Magnified view of part B.
[0022] Figure 8 It is an expanded view of the third type of corrugated foil in the present invention.
[0023] Figure 9 It is an expanded stereoscopic view of the third type of corrugated foil in the present invention.
[0024] Figure 10 yes Figure 9 Magnified view of part C in FIG.
[0025] Figure 11 It is a three-dimensional diagram of the top foil strip in the present invention. DETAILED DESCRIPTION
[0026] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.
[0027] A wave arch independent distributed dynamic pressure air radial bearing, such as Figure 1 As shown, it includes a bearing seat 1, a corrugated foil strip 2 and a top foil strip 3;
[0028] A foil mounting groove 1.1 is provided on the inner circle of the bearing seat 1;
[0029] The number of the bump foil strips 2 is equal to the number of the foil strip installation slots 1.1. The bump foil strips 2 include a bump foil strip installation head 2.1 and a bump foil strip body 2.2 connected to the bump foil strip installation head 2.1. The bump foil strip installation head 2.1 of the bump foil strip 2 is installed in the foil strip installation slot 1.1, and the bump foil strip body 2.2 of the bump foil strip 2 is a free end.
[0030] like Figure 11 As shown, the top foil strip 3 includes a top foil strip mounting head 3.1 and a top foil strip body 3.2 connected to the top foil strip mounting head 3.1. The top foil strip body 3.2 is a smooth foil strip bent into an arc shape. The top foil strip mounting head 3.1 of the top foil strip 3 is mounted in the foil strip mounting groove 1.1. The top foil strip body 3.2 is a free end and is located inside the corrugated foil strip body 2.2.
[0031] The corrugated foil body 2.2 is provided with a plurality of independent, semi-enclosed corrugated arch grooves 2.21. The portion of the corrugated foil body 2.2 enclosed by each corrugated arch groove 2.21 forms a corrugated arch assembly. Each corrugated arch assembly comprises an arc-shaped corrugated arch 2.22, an corrugated arch connecting piece 2.23 connected to one side of the corrugated arch 2.22, and an corrugated arch supporting piece 2.24 connected to the other side of the corrugated arch 2.22. The corrugated arch connecting piece 2.23 is connected to the corrugated foil body 2.2 between two adjacent corrugated arch grooves 2.21.
[0032] The outer circle of the corrugated foil strip body 2.2 outside the corrugated arch groove 2.21 contacts the inner circle of the bearing seat 1, and the arc top of the corrugated arch 2.22 contacts the outer circle of the top foil strip body 3.2.
[0033] The corrugated arch connecting piece 2.23 faces the corrugated foil strip installation head 2.1. The corrugated arch groove 2.21 is Π-shaped.
[0034] The corrugated foil strip 2 in the utility model can be used as follows Figure 2-4The structure shown in FIG. 2 can also be made of the following materials: Figure 5-7 The structure shown in FIG. 2 can also be used as the following example. Figure 8-10 The structure shown in Figure 8-10 In the figure, the arches 2.22 are distributed in an array.
[0035] The working principle of this utility model is as follows:
[0036] In the initial state, a certain preload exists on the main portion 2.2 of the corrugated foil strip 2. The top foil strip 3, serving as the bearing surface, is in full contact with the rotor surface. When the rotor rotates at high speed, gas is drawn into the narrow gap between the top foil strip 3 and the rotor due to viscosity. This air is compressed and forms a high-pressure air film. At this point, the elastic structure (the main portion 2.2 of the corrugated foil strip 2 and the top foil strip 3) and the rotor are separated by the high-pressure air film, and friction between them is essentially eliminated. Simultaneously, a significant portion of the radial load borne by the high-pressure air film on the top foil strip 3 is transferred to the main portion 2.2 of the corrugated foil strip 2, causing deformation of the main portion 2.2 of the corrugated foil strip 2. Because the corrugated arches 2.22 on the corrugated foil strip 2 are freely distributed and independent of each other, the bearing stiffness is freely distributed both circumferentially and axially, providing stable elastic support.
[0037] By adjusting the size and position arrangement of the wave arch 2.22, the stiffness and damping of each part of the bearing can be freely distributed, thereby improving the bearing capacity and stability.
[0038] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of the utility model and are not limiting. Although the utility model is described in detail with reference to examples, ordinary technicians in this field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.
Claims
1. A wave arch independent distributed dynamic pressure air radial bearing, comprising a bearing seat (1), a wave foil strip (2) and a top foil strip (3); A foil mounting groove (1.1) is provided on the inner circle of the bearing seat (1); The number of the wave foil strips (2) is equal to the number of the foil strip installation slots (1.1), and the wave foil strip (2) comprises a wave foil strip installation head (2.1) and a wave foil strip body (2.2) connected to the wave foil strip installation head (2.1); the wave foil strip installation head (2.1) of the wave foil strip (2) is installed in the foil strip installation slot (1.1), and the wave foil strip body (2.2) of the wave foil strip (2) is a free end; The top foil strip (3) comprises a top foil strip mounting head (3.1) and a top foil strip body (3.2) connected to the top foil strip mounting head (3.1), the top foil strip body (3.2) being a smooth foil strip bent into an arc shape; the top foil strip mounting head (3.1) of the top foil strip (3) is mounted in the foil strip mounting groove (1.1), the top foil strip body (3.2) is a free end, and the top foil strip body (3.2) is located on the inner side of the corrugated foil strip body (2.2); Its characteristics are: The corrugated foil strip body (2.2) is provided with a plurality of independently formed corrugated arch grooves (2.21) of a semi-enclosed structure. The portion of the corrugated foil strip body (2.2) enclosed by each corrugated arch groove (2.21) forms a corrugated arch assembly. Each corrugated arch assembly comprises an arc-shaped corrugated arch (2.22), a corrugated arch connecting piece (2.23) connected to one side of the corrugated arch (2.22), and a corrugated arch supporting piece (2.24) connected to the other side of the corrugated arch (2.22). The corrugated arch connecting piece (2.23) is connected to the corrugated foil strip body (2.2) between two adjacent corrugated arch grooves (2.21). The outer circle of the wave foil strip body (2.2) outside the wave arch groove (2.21) contacts the inner circle of the bearing seat (1), and the arc top of the wave arch (2.22) contacts the outer circle of the top foil strip body (3.2).
2. The wave arch independent distributed dynamic pressure air radial bearing according to claim 1, characterized in that: The corrugated arch connecting piece (2.23) faces the corrugated foil strip installation head (2.1).
3. The wave arch independent distributed dynamic pressure air radial bearing according to claim 1, characterized in that: The wave arch groove (2.21) is Π-shaped.