Thrust gas foil bearing

Abstract

The utility model provides a thrust gas foil bearing which comprises a bearing base, a plurality of foil sets are installed on the bearing base, each foil set comprises a flat foil and a bump foil, a first clamping plate is arranged at the fixed end of each bump foil, a plurality of first clamping grooves are formed in the bearing base, the first clamping plates are inserted into the first clamping grooves in the radial direction, and the first clamping plates are inserted into the first clamping grooves in the radial direction. The two radial ends of the first clamping plate are each provided with a first limiting flange, and the two first limiting flanges are used for abutting against the inner circumferential wall and the outer circumferential wall of the bearing base correspondingly. A second clamping plate is arranged at the fixed end of the flat foil, a plurality of second clamping grooves are formed in the bearing base, the second clamping plate is inserted into the second clamping grooves in the radial direction, second limiting flanges are arranged at the two radial ends of the second clamping plate, and the two second limiting flanges are used for abutting against the inner circumferential wall and the outer circumferential wall of the bearing base respectively. The bearing has the advantages of being simple in structure, convenient to assemble, accurate in positioning and long in service life.

Description

TECHNICAL FIELD

[0001] The utility model relates to bearing technical field, specifically, relate to a thrust air foil bearing. BACKGROUND

[0002] The commonly used thrust air foil bearing currently fixes the wave foil and the flat foil on the bearing base by welding or fasteners. These two fixing methods have their own disadvantages. Although the welding method has firm initial connection, the firmness of the connection will gradually decrease after long-term use, which may lead to performance degradation or failure of the bearing. Although the fastener method can achieve detachable connection, the assembly process is relatively complex, which increases the difficulty of production and maintenance. These problems not only affect the service life and reliability of the bearing, but also may increase the maintenance cost and downtime.

[0003] In addition, the welding points or fasteners may cause local stress concentration, affecting the uniformity and stability of the bearing. At the same time, these fixing methods also limit the application range of the bearing under high speed, high temperature or other extreme working conditions.

[0004] Considering the wide application of the thrust air foil bearing in high-end equipment such as aerospace, its performance and reliability are directly related to the safety and efficiency of the entire system. Therefore, developing a new type of more reliable and efficient fixing method to improve the performance and service life of the thrust air foil bearing has become an urgent need for current technical development. SUMMARY

[0005] The purpose of the present application is to provide a thrust air foil bearing with the advantages of simple structure, convenient assembly, accurate positioning and long service life.

[0006] The present application provides a thrust air foil bearing, comprising a ring-shaped bearing base, a plurality of foil groups uniformly distributed around the circumference are installed on the bearing base, each foil group comprises a flat foil and a wave foil, the wave foil is arranged between the flat foil and the bearing base, a first clamping plate is arranged on the fixed end of the wave foil, a plurality of first clamping grooves are arranged on the bearing base and spaced around the circumference, the first clamping plate is inserted into the first clamping groove along the radial direction, the radial ends of the first clamping plate are provided with first limiting flanges, and the two first limiting flanges are respectively used for abutting against the inner and outer circumferential walls of the bearing base; a second clamping plate is arranged on the fixed end of the flat foil, a plurality of second clamping grooves are arranged on the bearing base and spaced around the circumference, the second clamping plate is inserted into the second clamping groove along the radial direction, the radial ends of the second clamping plate are provided with second limiting flanges, and the two second limiting flanges are respectively used for abutting against the inner and outer circumferential walls of the bearing base.

[0007] Compared with the prior art, the thrust gas foil bearing has the following advantages: the first clamping plate and the second clamping plate are arranged at the fixed ends of the wave foil and the flat foil respectively, and the first clamping groove and the second clamping groove are arranged on the bearing base correspondingly, so that the foil is quickly installed, positioned and disassembled in the circumferential direction; meanwhile, the limiting flanges are arranged at the two ends of the clamping plate in the radial direction, so that the radial positioning of the foil is further ensured. The innovative design simplifies the assembly process of the bearing, improves the production efficiency, and improves the adaptability of the bearing under extreme working conditions such as high speed and high temperature. In addition, since the welding points or fasteners are avoided, the local stress concentration is reduced, and the uniformity and stability of the bearing are improved.

[0008] In a possible implementation, the first clamping plate is provided with a first flange plate away from the wave foil, the first clamping groove is provided with a first transverse groove for the radial insertion of the first flange plate, and the first flange plate is arranged to axially abut against the groove wall of the first transverse groove. Compared with the prior art, the axial positioning of the wave foil is effectively realized by adding the first flange plate to the first clamping plate and arranging the corresponding first transverse groove in the first clamping groove. This design not only improves the positioning accuracy of the wave foil, but also enhances the stability of the entire bearing structure.

[0009] In a possible implementation, the wave foil, the first clamping plate, the first flange plate and the first limiting flange are integrally formed. Compared with the prior art, the integrally formed structure simplifies the assembly process, reduces the difficulty of production and maintenance, and improves the overall structural strength and stability of the wave foil.

[0010] In a possible implementation, the width of the first clamping groove is greater than the thickness of the first clamping plate, and the width of the first transverse groove is greater than the thickness of the first flange plate. Compared with the prior art, by designing the width of the first clamping groove to be greater than the thickness of the first clamping plate, it can be ensured that the first clamping plate can be smoothly inserted into the first clamping groove, avoiding assembly difficulties caused by excessive tightness. Similarly, the width of the first transverse groove is greater than the thickness of the first flange plate, which is also to facilitate the insertion of the first flange plate.

[0011] In a possible implementation, the second clamping plate is provided with a second flange plate away from the flat foil, the second clamping groove is provided with a second transverse groove for the radial insertion of the second flange plate, and the second flange plate is arranged to axially abut against the groove wall of the second transverse groove. Compared with the prior art, the axial positioning of the flat foil is effectively realized by adding the second flange plate to the second clamping plate and arranging the corresponding second transverse groove in the second clamping groove. This design not only improves the positioning accuracy of the flat foil, but also enhances the stability of the entire bearing structure.

[0012] In a possible implementation, the flat foil, the second clamping plate, the second turning plate and the second limiting turning edge are integrally formed. Compared with the prior art, the integrally formed structure simplifies the assembly process, reduces the difficulty of production and maintenance, and improves the overall structural strength and stability of the flat foil.

[0013] In a possible implementation, the width of the second clamping slot is greater than the thickness of the second clamping plate, and the width of the second transverse slot is greater than the thickness of the second turning plate. Compared with the prior art, by designing the width of the second clamping slot to be greater than the thickness of the second clamping plate, it can be ensured that the second clamping plate can be smoothly inserted into the second clamping slot, avoiding assembly difficulties caused by too tight size; similarly, the width of the second transverse slot is greater than the thickness of the second turning plate, which is also to facilitate the insertion of the second turning plate.

[0014] In a possible implementation, the bearing base comprises a bearing disc and a plurality of pads connected to the end face of the bearing disc, and the plurality of pads are jointly formed into a ring structure in the circumferential direction, and each of the pads is provided with a first clamping slot and a second clamping slot. Compared with the prior art, the manufacturing and assembly process of the bearing base is simplified, and the maintainability and flexibility of the bearing are improved, making the manufacturing, assembly and maintenance of the bearing more convenient.

[0015] In a possible implementation, the pads are detachably connected to the bearing disc by bolts. Compared with the prior art, the maintenance and replacement of the bearing are more convenient, and the reliability and service life of the bearing are also improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a schematic diagram of the overall structure of the present application;

[0017] Figure 2 is a schematic diagram of the structure of the bearing disc;

[0018] Figure 3 is a schematic diagram of the structure of the plurality of pads Figure 1 ;

[0019] Figure 4 is a schematic diagram of the structure of the plurality of pads Figure 2 ;

[0020] Figure 5 is a schematic diagram of the structure of the foil group installed on the pad;

[0021] Figure 6 is a schematic diagram of the structure of the flat foil;

[0022] Figure 7 is a schematic diagram of the structure of the wave foil;

[0023] BRIEF DESCRIPTION OF DRAWINGS:

[0024] 1, bearing base; 11, bearing disc; 111, through hole; 12, cushion block; 121, threaded hole; 2, foil group; 21, flat foil; 211, second clamping plate; 212, second limiting flange; 213, second flange; 22, wave foil; 221, first clamping plate; 222, first limiting flange; 223, first flange; 3, first clamping groove; 31, first horizontal groove; 4, second clamping groove; 41, second horizontal groove. DETAILED DESCRIPTION

[0025] First of all, those skilled in the art should understand that these embodiments are only used to explain the technical principles of the embodiments of the present application, and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can adjust them as needed in order to adapt to specific application occasions.

[0026] In the description of the embodiments of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0027] In the embodiments of the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0028] The thrust air foil bearing plays a key role in high-speed rotating machinery, and its performance directly affects the efficiency and reliability of the whole system. At present, such bearings mainly fix the wave foil and the flat foil on the bearing base through welding or fasteners. However, these two fixing methods have their own limitations. Although the welding method has firm initial connection, the connection strength may decrease after long-term use, affecting the performance of the bearing. The fastener method can realize detachable connection, but the assembly process is complex, which increases the production and maintenance difficulty. These problems not only affect the service life and reliability of the bearing, but also may lead to the increase of maintenance cost and the prolongation of equipment downtime.

[0029] If these technical problems cannot be effectively solved, it will have a serious impact on the performance and reliability of the entire engine system. The decline in bearing performance can lead to reduced engine efficiency and increased fuel consumption. More seriously, bearing failure can cause engine shutdown, which directly threatens flight safety during flight. In the long run, frequent maintenance and replacement not only increase operating costs but also shorten the overall life of the engine. In addition, due to the limitations of bearing performance, the engine may be restricted from developing towards higher speed and higher temperature, thereby affecting the overall progress of aviation technology.

[0030] The application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] Referring to Figures 1 to 7 The embodiments of the application disclose a thrust gas foil bearing, which comprises a bearing base 1 in the shape of a ring, a plurality of groups of foil groups 2 are mounted on the bearing base 1 and are uniformly distributed around the circumference, each group of foil groups 2 comprises a flat foil 21 and a wave foil 22, the wave foil 22 is arranged between the flat foil 21 and the bearing base 1, a first clamping plate 221 is arranged on the fixed end of the wave foil 22, a plurality of first clamping grooves 3 are arranged on the bearing base 1 and are spaced apart around the circumference, the first clamping plate 221 is inserted into the first clamping groove 3 along the radial direction, first limiting flanges 222 are arranged at the two ends of the first clamping plate 221 in the radial direction, and the two first limiting flanges 222 are used for abutting against the inner circumferential wall and the outer circumferential wall of the bearing base 1 respectively; a second clamping plate 211 is arranged on the fixed end of the flat foil 21, a plurality of second clamping grooves 4 are arranged on the bearing base 1 and are spaced apart around the circumference, the second clamping plate 211 is inserted into the second clamping groove 4 along the radial direction, second limiting flanges 212 are arranged at the two ends of the second clamping plate 211 in the radial direction, and the two second limiting flanges 212 are used for abutting against the inner circumferential wall and the outer circumferential wall of the bearing base 1 respectively. The plurality of first clamping grooves 3 and the plurality of second clamping grooves 4 are staggered around the circumference on the bearing base 1.

[0032] As can be known from the above, the first clamping plate 221 is arranged on the fixed end of the wave foil 22, a plurality of first clamping grooves 3 are arranged on the bearing base 1 and are distributed at intervals in the circumferential direction, the first clamping plate 221 is inserted into the first clamping groove 3 in the radial direction, and the circumferential positioning of the wave foil 22 is achieved. In order to achieve radial positioning, first limiting flanges 222 are arranged at the two radial ends of the first clamping plate 221, and the flanges are respectively abutted against the inner and outer circumferential walls of the bearing base 1. The same principle also applies to the fixation of the flat foil 21. The second clamping plate 211 is arranged on the fixed end of the flat foil 21, a plurality of second clamping grooves 4 are arranged on the bearing base 1 and are distributed at intervals in the circumferential direction, the second clamping plate 211 is inserted into the second clamping groove 4 in the radial direction, and the circumferential positioning of the flat foil 21 is achieved. The two radial ends of the second clamping plate 211 are also provided with second limiting flanges 212 for abutting against the inner and outer circumferential walls of the bearing base 1 to achieve the radial positioning of the flat foil 21. This design not only solves the problem of the traditional fixing method, but also brings additional advantages, such as simplifying the assembly process and improving production efficiency. At the same time, since the welding points or fasteners are avoided, the local stress concentration is reduced, which helps to improve the uniformity and stability of the bearing. In addition, this design also makes it possible for the bearing to be used in extreme working conditions such as high speed and high temperature.

[0033] In this embodiment, the first clamping plate 221 is provided with a first flange 223 away from the wave foil 22, the first clamping groove 3 is provided with a first transverse groove 31 for the radial insertion of the first flange 223, and the first flange 223 is used to abut against the groove wall of the first transverse groove 31 in the axial direction. Specifically, the first flange 223 is arranged on the side of the first clamping plate 221 away from the wave foil 22; this arrangement can ensure that the first flange 223 does not interfere with the normal work of the wave foil 22, while also making full use of the space of the bearing base 1; the first transverse groove 31 is specially designed in the first clamping groove 3 to accommodate the first flange 223; when the first clamping plate 221 is inserted into the first clamping groove 3 in the radial direction, the first flange 223 is also inserted into the first transverse groove 31. The first flange 223 abuts against the groove wall of the first transverse groove 31 in the axial direction, and this abutting action achieves the axial positioning of the wave foil 22; since the first flange 223 and the first transverse groove 31 are both arranged in the radial direction, this positioning method can effectively prevent the wave foil 22 from shifting or wobbling in the axial direction; this design not only increases the stability of the wave foil 22, but also improves the running accuracy of the entire bearing.

[0034] In this embodiment, the wave foil 22, the first clamping plate 221, the first turning plate 223, and the first limiting turning edge 222 are integrally formed. In actual application, the integrally formed wave foil 22, the first clamping plate 221, the first turning plate 223, and the first limiting turning edge 222 can be achieved by precise numerical control machining technology; for example, the basic profile can be first made by laser cutting or wire cutting technology, and then the required three-dimensional structure is formed by precise bending and forming process; in the machining process, heat treatment process can be used to optimize the material properties, such as improving the strength and stability of the material by aging treatment. This integrally formed design not only improves the structural integrity of the wave foil 22, but also simplifies the assembly process. During installation, the integrally formed wave foil 22 can be simply inserted into the corresponding clamping slot of the bearing base 1 to complete the fixation, greatly reducing the assembly time and difficulty.

[0035] In this embodiment, the width of the first clamping slot 3 is greater than the thickness of the first clamping plate 221, and the width of the first transverse slot 31 is greater than the thickness of the first turning plate 223. This design not only solves the assembly problem, but also provides a certain space for the wave foil 22 to move; during the operation of the bearing, the wave foil 22 may be slightly deformed due to temperature changes or load effects; appropriate clearance can allow such deformation to avoid stress concentration or damage caused by excessive tightening.

[0036] In this embodiment, the second clamping plate 211 is provided with a second turning plate 213 away from one side of the flat foil 21, and the second clamping slot 4 is provided with a second transverse slot 41 for the second turning plate 213 to be inserted along the radial direction, and the second turning plate 213 is used to axially abut on the slot wall of the second transverse slot 41; the flat foil 21, the second clamping plate 211, the second turning plate 213, and the second limiting turning edge 212 are integrally formed; the width of the second clamping slot 4 is greater than the thickness of the second clamping plate 211, and the width of the second transverse slot 41 is greater than the thickness of the second turning plate 213. The above design has obvious advantages in the following aspects: first, through the cooperation of the second clamping plate 211 and the second clamping slot 4, the circumferential and radial positioning of the flat foil 21 is realized, avoiding the circumferential deviation of the flat foil 21 during operation; second, the design of the second turning plate 213 and the second transverse slot 41 further provides axial positioning, effectively preventing the flat foil 21 from loosening or falling off in the axial direction; third, the design of the second limiting turning edge 212 enhances the radial positioning effect and improves the stability of the overall structure; finally, the integrated design not only improves the structural strength, but also simplifies the manufacturing and assembly process, reducing the production cost. These improvements work together to significantly improve the performance and reliability of the thrust gas foil bearing, providing better technical support for its application in extreme working conditions such as high speed and high temperature.

[0037] In the embodiment, the bearing base 1 comprises a bearing disc 11 and a plurality of pads 12 connected to the end face of the bearing disc 11, the plurality of pads 12 are spliced together in a ring structure around the circumference, and each pad 12 is provided with a first clamping groove 3 and a second clamping groove 4. Specifically, the bearing disc 11 serves as a basic component to provide the main support for the entire bearing; the plurality of pads 12 are designed as detachable modules, which are spliced together in a complete ring structure around the circumference; each pad 12 is provided with a first clamping groove 3 and a second clamping groove 4, which are used to install the wave foil 22 and the flat foil 21 respectively. The modular design of the bearing base 1 not only solves the problems of manufacturing, assembly and maintenance of the traditional thrust gas foil bearing, but also provides a new idea for improving the bearing performance and prolonging the service life.

[0038] In the embodiment, the pads 12 are detachably connected to the bearing disc 11 by bolts. Specifically, first, the bearing disc 11 can be designed as a basic disc structure, and a plurality of through holes 111 are arranged on the bearing disc 11, which are uniformly distributed along the circumference of the bearing disc 11 and used for the bolts to pass through; second, each pad 12 can be designed as a sector structure to facilitate the splicing of the plurality of pads 12 into a ring shape, and a threaded hole 121 corresponding to the through hole 111 of the bearing disc 11 can be arranged at the bottom of each pad 12, which allows the threaded connection of the bolt to realize the connection of the pad 12 and the bearing disc 11.

[0039] In the description of the embodiments of the present application, it should be noted that in the description of the present application, the terms indicating the direction or position relationship are based on the direction or position relationship shown in the drawings, which is only for the convenience of description, and does not indicate or imply that the device or component must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0040] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "in the embodiment", "specific examples" or "some examples" means that the specific features, mechanisms, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, mechanisms, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0041] The above merely provides the specific implementation of the present application, but the protection scope of the present application is not limited to this. Any changes or replacements within the technical scope disclosed by the present application can be easily conceived by the person skilled in the art, and should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A thrust gas foil bearing, comprising a bearing base (1) in the shape of a ring, a plurality of groups of foil groups (2) being mounted on the bearing base (1) and being uniformly distributed in the circumferential direction, each group of the foil groups (2) comprising a flat foil (21) and a wave foil (22), the wave foil (22) being arranged between the flat foil (21) and the bearing base (1), characterized in that: a first clamping plate (221) is arranged on the fixed end of the wave foil (22), a plurality of first clamping grooves (3) are arranged on the bearing base (1) and are spaced apart in the circumferential direction, the first clamping plate (221) is inserted into the first clamping groove (3) in the radial direction, and first limiting flanges (222) are arranged on both radial ends of the first clamping plate (221), the two first limiting flanges (222) being used for abutting against the inner and outer circumferential walls of the bearing base (1), respectively; a second clamping plate (211) is arranged on the fixed end of the flat foil (21), a plurality of second clamping grooves (4) are arranged on the bearing base (1) and are spaced apart in the circumferential direction, the second clamping plate (211) is inserted into the second clamping groove (4) in the radial direction, and second limiting flanges (212) are arranged on both radial ends of the second clamping plate (211), the two second limiting flanges (212) being used for abutting against the inner and outer circumferential walls of the bearing base (1), respectively. The side of the first clamping plate (221) away from the wave foil (22) is provided with a first flange plate (223), and the first clamping groove (3) is provided with a first transverse groove (31) for the radial insertion of the first flange plate (223), and the first flange plate (223) is used for axially abutting against the groove wall of the first transverse groove (31). The wave foil (22), the first clamping plate (221), the first flange plate (223) and the first limiting flange (222) are integrally formed.

2. The thrust air foil bearing of claim 1 wherein, The width of the first clamping groove (3) is greater than the thickness of the first clamping plate (221), and the width of the first transverse groove (31) is greater than the thickness of the first flange plate (223).

3. The thrust air foil bearing of claim 2 wherein, The side of the second clamping plate (211) away from the flat foil (21) is provided with a second flange plate (213), and the second clamping groove (4) is provided with a second transverse groove (41) for the radial insertion of the second flange plate (213), and the second flange plate (213) is used for axially abutting against the groove wall of the second transverse groove (41).

4. The thrust air-foil bearing of claim 2, wherein, The flat foil (21), the second clamping plate (211), the second flange plate (213) and the second limiting flange (212) are integrally formed.

5. The thrust air-foil bearing of claim 1 wherein, The width of the second clamping groove (4) is greater than the thickness of the second clamping plate (211), and the width of the second transverse groove (41) is greater than the thickness of the second flange plate (213).

6. The thrust air-foil bearing of claim 5, wherein, The bearing base (1) comprises a bearing disc (11) and a plurality of pads (12) connected to the end face of the bearing disc (11), the plurality of pads (12) are spliced together in the circumferential direction to form a ring structure, and each of the pads (12) is provided with one of the first clamping grooves (3) and one of the second clamping grooves (4).

7. The thrust air-foil bearing of claim 5, wherein The pads (12) are detachably connected to the bearing disc (11) by bolts.

8. The thrust air foil bearing of claim 1 wherein, ​ 9. The thrust air-foil bearing of claim 8, wherein, ​

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