Tilting-pad thrust bearing structure of centrifugal compressor

Abstract

The utility model provides a centrifugal compressor tilting pad thrust bearing structure which comprises a bearing sleeve and a bearing seat fixed with the bearing sleeve, pad main bodies are installed on the side wall of the bearing seat in an annular array mode, sliding grooves are formed in the two ends of each pad main body, an elastic plate is fixedly connected between every two adjacent sliding grooves in a clamped mode, and the elastic plates are connected with the bearing seat in a clamped mode. Wherein a screw hole corresponding to the elastic plate is formed in the bearing seat, a bolt is installed on the side wall of the elastic plate, the bolt is inserted into the screw hole in a threaded mode, a protruding part abutting against the side wall of the bearing seat is fixed to the bolt, and through holes are formed in the center of the bearing sleeve and the center of the bearing seat. The bearing bush is provided with two through holes, a centrifugal compressor shaft body is arranged between the two through holes, clamping grooves are formed in the inner walls of the two through holes, and the two ends of the centrifugal compressor shaft body are connected with the two clamping grooves in a clamped mode respectively, so that each bearing bush can swing freely, an optimal oil wedge can be formed under any condition, and the high-speed stability is very good.

Description

Technical Field

[0001] The utility model relates to the technical field of tilting pad thrust bearings, in particular to a tilting pad thrust bearing structure for a centrifugal compressor. Background Art

[0002] The requirements for bearings in centrifugal compressors are safety and reliability, stable operation, good vibration resistance, and long service life. At present, most of the bearings used in domestic centrifugal compressors belong to hydrodynamic journal bearings with high speed and light load. The commonly used bearings on compressors are divided into two types: radial bearings and thrust bearings. Radial bearings include circular pad bearings, elliptical pad bearings, multi-oil wedge fixed bearings, and tilting pad bearings. Most current compressors use tilting pad bearings.

[0003] The patent with the application number 20190052755.4 discloses a tilting pad thrust bearing supported by disc springs, which includes a thrust disc, thrust pads, support blocks, spacer blocks, disc springs, collar rings, and locking bolts. The thrust pads and support blocks form thrust pad blocks. The disc springs are installed on the collar rings, the spacer blocks are installed on the upper parts of the disc springs and fastened by locking bolts, and the thrust pad blocks are installed on the spacer blocks. Specifically, the bearing adjusts the height difference between the pad blocks through the elasticity of the disc springs, so that each pad block can contact the thrust disc, and the central point support can play a self-balancing role. The two are combined to improve the reliability and performance of the thrust bearing.

[0004] The above technical solution uses the support blocks of the thrust pad box to form thrust pad blocks. However, since the thrust pad blocks are tightly connected to the side walls of the thrust disc, the thrust pad blocks cannot tilt. And because the spacer blocks are fixedly installed with fastening bolts, the disc springs on the inner walls of the spacer blocks cannot adjust the tilt angles of the fixed spacer blocks and pad blocks. Content of the Utility Model

[0005] The purpose of the utility model is to provide a tilting pad thrust bearing structure for a centrifugal compressor aiming at the deficiencies of the prior art. By setting a spring plate structure with bolts and a pad block main body structure clamped with the spring plate, the function of keeping vibration while the pad blocks are fixed is realized, and the problem that the pad blocks cannot tilt is solved.

[0006] To achieve the above purpose, the utility model provides the following technical solution: a tilting pad thrust bearing structure for a centrifugal compressor, including a bearing sleeve and a bearing housing fixed to the bearing sleeve. The side wall of the bearing housing is annularly and arrayedly provided with pad block main bodies. Both ends of the pad block main bodies are provided with chutes, and a spring plate is clamped and fixed between two adjacent chutes. A screw hole corresponding to the spring plate is provided on the bearing housing. A bolt is installed on the side wall of the spring plate, and the bolt is threadedly inserted into the screw hole, and a convex portion abutted against the side wall of the bearing housing is fixed on the bolt.

[0007] Preferably, through holes are provided at the central positions of the bearing sleeve and the bearing housing, and a centrifugal compressor shaft body is arranged between the two through holes.

[0008] Furthermore, clamping grooves are provided on the inner walls of the two through holes, and the two ends of the centrifugal compressor shaft body are respectively clamped with the two clamping grooves.

[0009] Still further, a receiving cavity for receiving a plurality of pad bodies is provided on the bearing sleeve, and connecting grooves are arranged in a circular true array on the inner wall of the receiving cavity.

[0010] Still further, an oil delivery hole is provided at the central position of the pad body, an oil injection hole corresponding to the oil delivery hole is provided on the side wall of the bearing housing, and the two ends of the connecting groove are respectively communicated with the oil delivery hole and the oil injection hole.

[0011] Still further, a plurality of mounting holes are arranged in a circular array on the side walls of the bearing sleeve and the bearing housing, and the two groups of mounting holes correspond to each other.

[0012] Still further, the sliding groove is of an L-shaped structure, and a positioning portion that fits and is clamped in the sliding groove is provided on the elastic plate.

[0013] The beneficial effects of the present utility model are as follows:

[0014] (1) In the present utility model, an elastic plate is installed between adjacent two pads through a clamping groove, and the elastic plate is fixed to the bearing housing through bolts, so that each pad can swing freely, and the best oil wedge can be formed under any circumstances, and the high-speed stability is very good, and oil film oscillation is not likely to occur. When the operating conditions such as the unit speed and load change, the pads can swing freely on the supporting surface of the bearing housing, automatically adjust the positions of the pads, and form the best lubricating oil wedge;

[0015] (2) In the present utility model, the sliding groove is of an L-shaped structure, and a protruding portion inserted into the sliding groove is provided on the elastic plate. The protruding portion keeps the elastic plate and the pad body fixed, preventing the pad and the journal from rotating together in the circumferential direction. By providing a protruding portion on the thread, the protruding portion abuts against the side wall of the bearing housing after the bolt is installed, so that there is a certain distance between the pad body and the bearing housing, and the pad body has a swinging space. Description of the Drawings

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

[0017] Figure 2 is a schematic diagram of the structure of the bearing sleeve of the present utility model;

[0018] Figure 3 is a schematic cross-sectional view of the structure of the bearing housing of the present utility model;

[0019] Figure 4 For the present utility model Figure 3 is a schematic enlarged view of the structure at position A in the present utility model.

[0020] In the figure: 1. Centrifugal compressor shaft body; 2. Bearing sleeve; 3. Bearing housing; 4. Oil injection hole; 5. Oil delivery hole; 6. Mounting hole; 7. Connection groove; 8. Accommodating cavity; 9. Card slot; 10. Through hole; 11. Wedge block main body; 12. Positioning part; 13. Elastic plate; 14. Screw hole; 15. Protrusion part; 16. Slide groove; 17. Bolt. Specific embodiments

[0021] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0022] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality" means two or more unless otherwise specifically defined.

[0023] Embodiment 1

[0024] As Figure 1 and Figure 4As shown in the figure, this embodiment provides a tilting pad thrust bearing structure for a centrifugal compressor, which includes a bearing sleeve 2 and a bearing housing 3 fixed to the bearing sleeve 2. The side wall of the bearing housing 3 is installed with pad bodies 11 in a circular array. Both ends of the pad body 11 are provided with sliding grooves 16, and an elastic plate 13 is fixedly connected between two adjacent sliding grooves 16. A screw hole 14 corresponding to the elastic plate 13 is opened on the bearing housing 3. A bolt 17 is installed on the side wall of the elastic plate 13, and the bolt 17 is threadedly inserted into the screw hole 14, and a convex portion 15 abutting against the side wall of the bearing housing 3 is fixed on the bolt 17.

[0025] Through holes 10 are opened at the central positions of the bearing sleeve 2 and the bearing housing 3 respectively. A centrifugal compressor shaft body 1 is arranged between the two through holes 10. Clamping grooves 9 are opened on the inner walls of the two through holes 10, and both ends of the centrifugal compressor shaft body 1 are respectively clamped with the two clamping grooves 9. A receiving cavity 8 for accommodating a plurality of pad bodies 11 is opened on the bearing sleeve 2. Connecting grooves 7 are opened on the inner wall of the receiving cavity 8 in a circular true array. The elastic plate 13 is fixed to the bearing housing 3 through the bolt 17, so that each pad can swing freely and form an optimal oil wedge under any circumstances, with very good high-speed stability and not prone to oil film oscillation. When the operating conditions such as the unit speed and load change, the pad can swing freely on the supporting surface of the bearing housing 3 to automatically adjust the position of the pad and form an optimal lubricating oil wedge.

[0026] Embodiment Two

[0027] As Figure 2 and Figure 3 shown in the figure, the same or corresponding components as those in Embodiment One are marked with corresponding reference numerals in Embodiment One. For the sake of simplicity, only the differences from Embodiment One will be described below. The difference between this Embodiment Two and Embodiment One lies in that: an oil delivery hole 5 is opened at the central position of the pad body 11, an oil injection hole 4 corresponding to the oil delivery hole 5 is opened on the side wall of the bearing housing 3, and both ends of the connecting groove 7 are respectively communicated with the oil delivery hole 5 and the oil injection hole 4. When the centrifugal compressor shaft body 1 rotates, lubricating oil is delivered through the oil injection hole 4, the oil delivery hole 5 and the connecting groove 7. A plurality of mounting holes 6 are opened on the side walls of the bearing sleeve 2 and the bearing housing 3 in a circular array respectively, and the two groups of mounting holes 6 correspond to each other. The sliding groove 16 is of an L-shaped structure. A positioning portion 12 that fits and is clamped in the sliding groove 16 is provided on the elastic plate 13. A convex portion 15 inserted into the sliding groove 16 is provided on the elastic plate 13. The convex portion 15 keeps the elastic plate 13 and the pad body 11 fixed to prevent the pad from rotating together with the journal in the circumferential direction. By providing a convex portion 15 on the thread, after the bolt 17 is installed, the convex portion 15 abuts against the side wall of the bearing housing 3, so that there is a certain distance between the pad body 11 and the bearing housing 3, providing a swinging space for the pad body 11.

[0028] Working Steps

[0029] Step 1: The elastic plate 13 is fixed to the bearing block 3 by bolts 17. After installation, the convex portion 15 of the bolt 17 abuts against the side wall of the bearing block 3, so that there is a certain distance between the pad body 11 and the bearing block 3, enabling the pad body 11 to have a swinging space. When the pad body 11 is affected by a thrust force, each pad can swing freely. The elastic plate 13 is provided with a convex portion 15 inserted into the chute 16, and the convex portion 15 keeps the elastic plate 13 and the pad body 11 fixed, preventing the pad from rotating with the journal along the circumferential direction. An optimal oil wedge can be formed under any circumstances, with very good high-speed stability and not prone to oil film oscillation. When the operating conditions such as the unit speed and load change, the pad can swing freely on the supporting surface of the bearing block 3, automatically adjusting the pad position to form an optimal lubricating oil wedge.

[0030] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A tilting pad thrust bearing structure for a centrifugal compressor, comprising a bearing sleeve and a bearing housing fixed to the bearing sleeve, characterized in that, The side walls of the bearing housing are installed with tile bodies in an annular array. Both ends of the tile body are provided with chutes. A resilient plate is fixedly clamped between two adjacent chutes. A screw hole corresponding to the resilient plate is provided on the bearing housing. A bolt is installed on the side wall of the resilient plate. The bolt is threadedly inserted into the screw hole, and a convex portion abutted against the side wall of the bearing housing is fixed on the bolt.

2. The tilting pad thrust bearing structure of a centrifugal compressor according to claim 1, characterized in that, Through holes are provided at the central positions of both the bearing sleeve and the bearing housing. A centrifugal compressor shaft body is arranged between the two through holes.

3. The tilting pad thrust bearing structure of a centrifugal compressor according to claim 2, characterized in that, Card slots are provided on the inner walls of both through holes. The two ends of the centrifugal compressor shaft body are respectively clamped with the two card slots.

4. The structure of the tilting pad thrust bearing of a centrifugal compressor according to claim 1, wherein, A receiving cavity for receiving a plurality of tile bodies is provided on the bearing sleeve. Connecting grooves are provided on the inner wall of the receiving cavity in an annular true array.

5. The structure of a tilting pad thrust bearing for a centrifugal compressor according to claim 4, wherein An oil delivery hole is provided at the central position of the tile body. An oil injection hole corresponding to the oil delivery hole is provided on the side wall of the bearing housing. The two ends of the connecting groove are respectively communicated with the oil delivery hole and the oil injection hole.

6. The structure of a tilting pad thrust bearing for a centrifugal compressor according to claim 5, wherein, A plurality of mounting holes are provided on the side walls of both the bearing sleeve and the bearing housing in an annular array. The two groups of mounting holes correspond to each other.

7. The structure of the tilting pad thrust bearing of a centrifugal compressor according to claim 1, characterized in that, The chute is of an L-shaped structure. A positioning portion is provided on the resilient plate and is fitted and clamped in the chute.

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