A new type of high-temperature-resistant small-pore tilting pad bearing

Abstract

The application provides a novel high-temperature-resistant small-hole tilting-pad bearing which is mainly composed of a bearing shell and a metal wire mesh structure, adopts a tilting-pad structure with S spring flexibility, is provided with micro grooves on each pad, and is provided with small holes on the micro grooves as working surfaces for supplying gas to form a gas film. The left and right two parts of the bearing shell are integrally machined by using electric spark technology and are connected and fixed by using cylindrical pins. Since the throttler, the flow channel and the shell are integrally machined, the bearing has the characteristics of high-temperature resistance. The metal wire mesh structure is embedded in the gap between the bearing body and the pad, the metal wire mesh structure provides flexible support for the pad, and can keep the performance stable at high and low temperatures. Therefore, the bearing structure provided by the application can provide higher damping characteristics for the bearing and has the characteristics of high-temperature resistance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air bearing, in particular to a new type of high-temperature-resistant small-hole tilting pad bearing which adopts a throttling mode of small holes and micro grooves, is integrally processed with tilting pad, has a metal wire mesh structure and a S spring damping structure, and is divided into left and right two parts, so that the bearing has greater damping and high-temperature resistance. BACKGROUND

[0002] Air bearing has many characteristics such as high speed, low loss, compact structure, maximum design freedom, etc., and can provide efficiency and stability for various devices, and is widely used in aerospace, environmental protection, automobile, petroleum chemical industry, energy power and other industries. However, due to the low viscosity of the lubricating medium, the traditional rigid gas bearing structure has high cross-coupling stiffness, which causes instability of the rotor. The flexible tilting pad structure can reduce the cross stiffness of the bearing and improve the stability of the rotor system. However, due to the inherent characteristics of the lubricating medium, the bearing still has low carrying capacity and damping performance.

[0003] Air bearing is one of the key elements to realize S-CO2 power cycle. For large turbine units during start-up and shutdown stages, the gas bearing generates very large friction and wear, and the gas bearing has low carrying capacity, low stiffness, small damping and poor stability. The dynamic and static pressure mixed bearing has the advantages of dynamic pressure bearing and static pressure gas bearing, which can reduce wear during start-up and shutdown, and can improve the carrying capacity. The present application adopts a throttling mode of small holes and micro grooves and is integrally processed with tilting pad, and the damping structure of S-shaped spring and metal wire mesh, which reduces the complexity of the bearing system while improving the reliability of the whole system. The bearing as a whole can adapt to high temperature environment, avoid the possibility of glue falling off and failure of porous tilting pad bearing under high temperature operation, so as to solve the problem of supporting parts operating under high temperature in S-CO2 turbine machinery. SUMMARY

[0004] Based on the above background technology, in order to improve the heat resistance of the traditional gas bearing, a new type of high-temperature-resistant small-hole tilting pad bearing is provided, which is integrally processed by adopting a metal wire mesh structure, a left throttler, a flow channel and a shell.

[0005] The technical scheme of the present application is as follows:

[0006] The new type of high-temperature-resistant small-hole tilting pad bearing of the present application mainly comprises a bearing shell and a metal wire mesh.

[0007] Further, the tilting pad structure in the bearing shell is composed of 4 pad blocks and 8 S-shaped spring structures, and the whole bearing is divided into left and right symmetrical two parts, each part is integrally processed by wire spark cutting.

[0008] Further, the "S" spring structure provides flexible support for the bearing, and the eight "S" spring structures are symmetrically distributed around the bearing.

[0009] Further, the metal wire mesh is formed by stamping and embedded in the gap between the bearing body and the block to provide damping performance for the bearing. The metal wire mesh can also be replaced by other damping materials.

[0010] Further, each block is supported by two "S" spring structures (1), and there are three long microgrooves on the inner side, two small holes are punched on each microgroove, and the small holes provide gas for the working surface to form an air film. The number of microgrooves and small holes can be changed.

[0011] Further, three M6 cylindrical threaded holes are distributed under each block microgroove, and the edges of the cylindrical threaded holes form a thin hole wall with the working surface to facilitate the punching of smaller small hole diameters.

[0012] Further, the cylindrical threaded hole serves as a gas flow channel, and the cylindrical gas flow channel threaded hole is sealed with a screw plug wrapped with a raw material belt. A PT1 / 4 pneumatic connector is used on the back of the bearing bush to connect the cylindrical gas flow channel threaded holes on the bearing bush, forming a gas supply passage.

[0013] Further, the bearing cover and the bolt provide axial fixation, and other various fixation methods can also be used.

[0014] Further, the left and right parts of the bearing shell are connected and fixed by a cylindrical pin, and other various fixation methods can also be used. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall appearance of the present application.

[0016] Figure 2 It is a schematic diagram of the overall internal structure of the present application.

[0017] Figure 3 It is an exploded view of the present application.

[0018] Figure 4 It is a schematic diagram of the structure of the bearing shell (1) of the present application.

[0019] Figure 5 It is a partial enlarged view of the bearing shell microgroove (7).

[0020] Figure 6 It is a schematic diagram of the structure of the bearing cover (4) of the present application.

[0021] Figure 7 It is a schematic diagram of the structure of the metal wire mesh (2) of the present application.

[0022] Figure 8 Structure diagram of cylindrical pin (3) of the application. DETAILED DESCRIPTION

[0023] The application will be further described in detail below with reference to the accompanying drawings, however, it should be understood that the following specific embodiments are only preferred embodiments of the application, and should not be understood as limiting the application.

[0024] As shown in Figure 1 , Figure 3 and Figure 7 , the bearing cover (4) and the bearing shell (1) are connected using bolts (5), the wire mesh structure (2) is annular, embedded in the annular area between the bearing body and the pad,

[0025] As shown in Figure 2 , Figure 3 and Figure 8 , (1) is a bearing shell, (2) is a wire mesh structure, (3) is a cylindrical pin, (4) is a bearing cover, (5) is a bolt, (6) is a pad, (7) is a micro groove, (8) is a small hole, (9) is a threaded hole, (10) is a screw plug, (11) is an S spring structure, and (12) is a pneumatic connector. Among them, the left and right parts of the bearing shell (1) are integrally machined by electric spark technology, and are connected by two cylindrical pins (3).

[0026] As shown in Figure 4 , each pad (6) has three cylindrical threaded holes (9) distributed under the micro groove, the cylindrical gas flow channel threaded hole (9) is sealed with a screw plug (10) wrapped with raw material belt, and the pneumatic connector (12) is used at the back of the bearing pad to connect the cylindrical gas flow channel threaded holes (9) on the bearing pad, forming a gas supply passage.

[0027] As shown in Figure 5 and Figure 6 , the bearing shell (1) has a total of four pads (6), each pad has two "S" springs (11). Each pad has three circumferentially distributed micro grooves (7), and each micro groove has two small holes (8).

Claims

1. A new type of high temperature resistant small hole tilting pad bearing, characterized in that: The high-temperature-resistant small-pore tilting-pad bearing comprises a bearing shell (1), two wire meshes (2), two cylindrical pins (3), two bearing covers (4) and bolts (5), the tilting-pad structure in the bearing shell (1) is composed of four pads (6) and eight "S" spring structures (11), the bearing is divided into two symmetrical parts, and the two parts are connected through the two cylindrical pins (3), and the two parts are integrally machined through wire spark cutting; the two bearing covers (4) are fixed on the end faces of the bearing shell (1) through the bolts (5), the wire mesh (2) is annular and is embedded in the annular area between the bearing shell (1) and the pad (6), the "S" spring structure (11) provides flexible support for the bearing, the eight "S" spring structures (11) are combined in pairs and symmetrically distributed around the bearing, the wire mesh (2) is embedded in the gap of the bearing body, and the "S" spring structure (11) and the wire mesh (2) provide high damping performance for the bearing; the wire mesh (2) is formed by stamping and is embedded in the gap between the bearing body and the pad; each pad (6) is supported by two "S" spring structures (11), and the inner side of each pad (6) is provided with three long-strip microgrooves (7), two small holes (8) are formed in each long-strip microgroove (7), the long-strip microgroove (7) is 18 mm long and 45 microns deep, the small hole (8) has an inner diameter of 0.2 mm, and the small hole (8) provides gas for the working surface to form an air film; three M6 cylindrical threaded holes (9) are distributed below each pad (6) microgroove, on one hand, the edges of the cylindrical threaded holes (9) and the working surface form a thin hole wall to facilitate the formation of a smaller small hole (8) with a smaller hole diameter, and on the other hand, the cylindrical threaded holes (9) function as a gas flow channel, the cylindrical threaded holes (9) are sealed by winding raw material belts with screw plugs (10), and the three cylindrical threaded holes (9) on the pad (6) are connected to form a gas supply passage through the pneumatic joint (12) used at the back of the pad (6).

2. A novel high temperature resistant small hole tilting pad bearing according to claim 1, characterized in that: The bearing cover (4) provides axial fixation through the bolt (5).

3. A novel high temperature resistant small hole tilting pad bearing according to claim 1, characterized in that: The symmetrical left and right parts of the bearing shell (1) are connected and fixed through the two cylindrical pins (3).

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