Bump foil belt middle connection type dynamic pressure air radial bearing

Abstract

The utility model relates to a bump foil belt middle connection type dynamic pressure air radial bearing which comprises a bearing seat, a bump foil belt and a top foil belt, and the bump foil belt comprises a bump foil belt installation head and a bump foil belt body connected with the bump foil belt installation head. The bump foil tape body comprises at least two sections of first bump foil tape bodies and second bump foil tape units connected with the two adjacent sections of first bump foil tape bodies, the first bump foil tape bodies are corrugated, segmentation grooves are formed in the first bump foil tape bodies, the segmentation grooves are formed in the length direction of the first bump foil tape bodies, the second bump foil tape units are arc-shaped pieces, and the arc-shaped pieces are arranged in the length direction of the first bump foil tape bodies. The first bump foil tape body comprises a plurality of first bump foil tape units which are connected together side by side, each first bump foil tape unit is an arc-shaped sheet, and all the first bump foil tape units in the section of the first bump foil tape body are cut off by the cutting grooves. According to the utility model, the bearing capacity can be improved, so that the air bearing can stably run at high speed and long service life.

Description

Technical Field

[0001] The utility model relates to an air bearing in the technical field, and specifically discloses a wave foil intermediate connection type dynamic pressure air radial bearing. Background Art

[0002] The hydrodynamic air bearing forms a hydrodynamic air film to support the rotor through the principle of hydrodynamic pressure, which avoids mechanical friction between the rotor and the bearing surface, reduces heat generation, and thus improves the operating efficiency and life of the bearing.

[0003] The existing commonly used foil air bearings are composed of three foil strips with a certain distance between them in the axial direction. The bearing foil with this structure may not be able to withstand some extreme load conditions and has poor impact resistance. The foil stiffness needs to be strengthened according to the load conditions. Summary of the Invention

[0004] The purpose of the utility model is to overcome the deficiencies in the prior art and to provide a wave foil intermediate connection type dynamic pressure air radial bearing capable of improving the load-bearing capacity.

[0005] According to the technical solution provided by the utility model, the corrugated foil intermediate connection type dynamic pressure air radial bearing comprises a bearing seat, a corrugated foil and a top foil;

[0006] At least three foil mounting grooves arranged at even intervals are provided on the inner circle of the bearing seat;

[0007] The number of the top foil strip is one, and the top foil strip comprises a top foil strip installation head and a top foil strip body connected to the top foil strip installation head, and the top foil strip body is a smooth foil strip bent into an arc shape;

[0008] The number of the corrugated foil strips is equal to the number of the foil strip installation slots. The corrugated foil strip includes a corrugated foil strip installation head and a corrugated foil strip body connected to the corrugated foil strip installation head. The corrugated foil strip body includes at least two first corrugated foil strip sections and second corrugated foil strip units connected to two adjacent first corrugated foil strip sections. The first corrugated foil strip body is corrugated and provided with a dividing groove arranged along the length of the first corrugated foil strip body. The second corrugated foil strip units are arcuate sheets. The first corrugated foil strip body includes a plurality of first corrugated foil strip units connected side by side. The first corrugated foil strip units are arcuate sheets, and the dividing grooves cut through all the first corrugated foil strip units in the first corrugated foil strip section.

[0009] The corrugated foil mounting head of each corrugated foil is installed in the corresponding foil mounting groove, the corrugated foil body of the corrugated foil is a free end, and the connection between two adjacent first corrugated foil units and the connection between the first corrugated foil unit and the second corrugated foil unit are in contact with the inner circle of the bearing seat;

[0010] The top foil strip mounting head of the top foil strip is installed in one of the foil strip mounting grooves, the top foil strip body is the free end, the top foil strip body is located on the inner side of the corrugated foil strip body, and the outer circle of the top foil strip body contacts the arc top of the first corrugated foil strip unit and the arc top of the second corrugated foil strip unit.

[0011] Preferably, three foil mounting grooves are provided on the inner circle of the bearing seat at even intervals.

[0012] Preferably, the corrugated foil body comprises two sections of first corrugated foil bodies and a second corrugated foil unit connected to the two adjacent sections of the first corrugated foil bodies.

[0013] Preferably, two dividing grooves are provided on the first corrugated foil body and the two dividing grooves are arranged in parallel.

[0014] Preferably, the cross-section of the foil installation groove is T-shaped.

[0015] The utility model can improve the load-bearing capacity, thereby enabling the air bearing to operate at high speed, stably and with a long service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional diagram of the present utility model.

[0017] Figure 2 It is a three-dimensional diagram of all the corrugated foil strips in the utility model.

[0018] Figure 3 It is an expanded view of a corrugated foil strip in the utility model.

[0019] Figure 4 It is a three-dimensional diagram of the top foil strip in the present invention. DETAILED DESCRIPTION

[0020] 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.

[0021] A wave foil with intermediate connection type 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;

[0022] At least three foil strip mounting grooves 1.1 are provided on the inner circle of the bearing seat 1 at even intervals, and the cross-section of the foil strip mounting grooves 1.1 is T-shaped;

[0023] like Figure 4 As shown, the number of the top foil strip 3 is one, and 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 a nearly full circular arc shape.

[0024] The number of the corrugated foil strips 2 is equal to the number of the foil strip mounting slots 1.1;

[0025] like Figure 2 and Figure 3 As shown, the bump foil strip 2 includes a bump foil strip installation head 2.1 and a bump foil strip body connected to the bump foil strip installation head 2.1. The bump foil strip body includes at least two first bump foil strip sections 2.2 and second bump foil strip units 2.3 connected to two adjacent first bump foil strip sections. The first bump foil strip sections 2.2 are corrugated and have dividing grooves 2.4 formed therein. The dividing grooves 2.4 are arranged along the length of the first bump foil strip sections 2.2. The second bump foil strip units 2.3 are arcuate sheets. The first bump foil strip section 2.2 includes a plurality of first bump foil strip units 2.21 connected side by side. The first bump foil strip units 2.21 are arcuate sheets, and the dividing grooves 2.4 cut through all the first bump foil strip units 2.21 in the first bump foil strip section 2.2.

[0026] The corrugated foil mounting head 2.1 of each corrugated foil strip 2 is mounted in the corresponding foil mounting groove 1.1. The corrugated foil strip body of the corrugated foil strip 2 is a free end. The connection between two adjacent first corrugated foil strip units 2.21 and the connection between the first corrugated foil strip unit 2.21 and the second corrugated foil strip unit 2.3 are in contact with the inner circle of the bearing seat 1.

[0027] The top foil strip mounting head 3.1 of the top foil strip 3 is installed in one of the foil strip mounting grooves 1.1, and the top foil strip body 3.2 is a free end. The top foil strip body 3.2 is located on the inner side of the corrugated foil strip body, and the outer circle of the top foil strip body 3.2 contacts the arc top of the first corrugated foil strip unit 2.21 and the arc top of the second corrugated foil strip unit 2.3.

[0028] Three foil mounting grooves 1.1 are provided on the inner circle of the bearing seat 1 and are evenly spaced.

[0029] The corrugated foil body comprises two sections of first corrugated foil bodies 2.2 and a second corrugated foil unit 2.3 connected to the two adjacent sections of the first corrugated foil bodies.

[0030] Two dividing grooves 2.4 are formed on the first corrugated foil body 2.2 and the two dividing grooves 2.4 are arranged in parallel.

[0031] The working principle of this utility model is as follows:

[0032] When the shaft rotates at high speed, gas with a certain viscosity enters the gap between the shaft and the top foil strip body 3.2 of the top foil strip 3 under the drive of the shaft, and forms a dynamic pressure lubrication gas film by utilizing the dynamic pressure effect. When the pressure is balanced with the external force, the shaft and the top foil strip body 3.2 of the top foil strip 3 are separated, and the friction between the two basically disappears.

[0033] During operation, the top foil body 3.2 of the top foil strip 3 deforms under the radial load from the autoclave gas. The majority of this load is ultimately transferred to the main body of the corrugated foil strip 2. Because the corrugated foil strip body comprises at least two first corrugated foil sections 2.2 and second corrugated foil units 2.3 connected to the two adjacent first corrugated foil sections, a dividing groove 2.4 is defined in the first corrugated foil sections 2.2. This groove 2.4 does not extend into the second corrugated foil units 2.3, enhancing the strength of the corrugated foil strip 2 and improving the bearing's load-bearing performance. Furthermore, because the outer periphery of the top foil strip body 3.2 contacts the arc tops of the first corrugated foil units 2.21 and the second corrugated foil units 2.3, the Coulomb damping generated by the sliding motion between the top foil strip body 3.2 and the arc tops of the first corrugated foil units 2.21 and the second corrugated foil units 2.3 provides the bearing with a certain degree of shock and vibration reduction capability.

[0034] Because the corrugated foil body comprises at least two first corrugated foil sections 2.2 and second corrugated foil units 2.3 connected to the adjacent first corrugated foil sections, a dividing groove 2.4 is defined in the first corrugated foil sections 2.2. This dividing groove 2.4 does not extend into the second corrugated foil sections 2.3, and the second corrugated foil sections 2.3 are flush with the adjacent first corrugated foil sections 2.21, fully utilizing the original space of the corrugated foil 2. This structure neither increases the bearing volume nor interferes with the bearing air film distribution. Compared to existing technologies, the modifications are minimal and easy to operate. The presence of the second corrugated foil sections 2.3 strengthens the rigidity of the connection between the second corrugated foil sections 2.3 and the first corrugated foil sections 2.21 and their vicinity, improving the load-bearing capacity at that location while minimally impacting the load-bearing capacity at other locations. This solves the problem of requiring reinforcement at a specific location to improve the bearing's ability to withstand certain high-load conditions without requiring major design changes. The presence of the second corrugated foil sections 2.3 also significantly reduces deformation of the corrugated foil 2 during processing, improving the yield rate.

[0035] Due to the existence of the second wave foil unit 2.3, the load-bearing capacity of the utility model is improved, so that the air bearing can run at high speed, stably and with long service life.

[0036] 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 foil intermediate connection type dynamic pressure air radial bearing, comprising a bearing seat (1), a wave foil (2) and a top foil (3); At least three foil mounting grooves (1.1) arranged at even intervals are provided on the inner circle of the bearing seat (1); The number of the top foil strip (3) is one, and 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), and the top foil strip body (3.2) is a smooth foil strip bent into an arc shape; The number of the corrugated foil strips (2) is equal to the number of the foil strip mounting slots (1.1); Its characteristics are: The corrugated foil strip (2) comprises a corrugated foil strip installation head (2.1) and a corrugated foil strip body connected to the corrugated foil strip installation head (2.1); the corrugated foil strip body comprises at least two sections of first corrugated foil strip bodies (2.2) and second corrugated foil strip units (2.3) connected to two adjacent sections of the first corrugated foil strip bodies; the first corrugated foil strip body (2.2) is corrugated; a dividing groove (2.4) is provided on the first corrugated foil strip body (2.2); the dividing groove (2.4) is arranged along the length direction of the first corrugated foil strip body (2.2); the second corrugated foil strip unit (2.3) is an arc-shaped sheet; the first corrugated foil strip body (2.2) comprises a plurality of first corrugated foil strip units (2.21) connected side by side; the first corrugated foil strip units (2.21) are arc-shaped sheets; the dividing groove (2.4) cuts off all the first corrugated foil strip units (2.21) in the first corrugated foil strip body (2.2) of the section; The corrugated foil strip mounting head (2.1) of each corrugated foil strip (2) is mounted in the corresponding foil strip mounting groove (1.1), the corrugated foil strip body of the corrugated foil strip (2) is a free end, and the connection between two adjacent first corrugated foil strip units (2.21) and the connection between the first corrugated foil strip unit (2.21) and the second corrugated foil strip unit (2.3) are in contact with the inner circle of the bearing seat (1); The top foil strip mounting head (3.1) of the top foil strip (3) is mounted in one of the foil strip mounting grooves (1.1), the top foil strip body (3.2) is a free end, the top foil strip body (3.2) is located on the inner side of the corrugated foil strip body, and the outer circle of the top foil strip body (3.2) contacts the arc top of the first corrugated foil strip unit (2.21) and the arc top of the second corrugated foil strip unit (2.3).

2. The corrugated foil intermediate connection type dynamic pressure air radial bearing according to claim 1, characterized in that: Three foil mounting grooves (1.1) arranged at even intervals are provided on the inner circle of the bearing seat (1).

3. The corrugated foil intermediate connection type dynamic pressure air radial bearing according to claim 1, characterized in that: The corrugated foil body comprises two sections of first corrugated foil bodies (2.2) and a second corrugated foil unit (2.3) connected to the two adjacent sections of the first corrugated foil bodies.

4. The dynamic pressure air radial bearing of the corrugated foil intermediate connection type according to claim 1, characterized in that: Two dividing grooves (2.4) are provided on the first wave foil body (2.2), and the two dividing grooves (2.4) are arranged in parallel.

5. The corrugated foil intermediate connection type dynamic pressure air radial bearing according to claim 1, characterized in that: The cross-sectional shape of the foil installation groove (1.1) is T-shaped.

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