CN214424902U

CN214424902U - Combined bearing and steam turbine

Info

Publication number: CN214424902U
Application number: CN202023223377.3U
Authority: CN
Inventors: 周政; 付学伟; 高伟; 李佳朋; 赵兴旺; 方瑶; 刘伟阳; 惠婷娟; 闫宏亮
Original assignee: Xian Shaangu Power Co Ltd
Current assignee: Xian Shaangu Power Co Ltd
Priority date: 2020-12-28
Filing date: 2020-12-28
Publication date: 2021-10-19
Anticipated expiration: 2030-12-28

Abstract

The utility model discloses a combination bearing and steam turbine. The disclosed combined bearing comprises a bearing body, wherein a main shaft mounting hole is formed in the bearing body; a first cavity and a second cavity are arranged on the inner wall of the main shaft mounting hole, an inclinable pad thrust bearing is mounted in the first cavity, and an inclinable pad radial bearing is mounted in the second cavity; and a lubricating oil channel and an oil return channel are formed in the side wall of the bearing body. The disclosed steam turbine is a steam turbine equipped with the above-described combination bearing. The utility model discloses in concentrating a bearing body with tilting pad formula footstep bearing and tilting pad formula journal bearing, play the spacing and radial bearing's of axial effect respectively, the distance between two kinds of bearings diminishes simultaneously to a total oil inlet that can share has saved the space, makes compact structure.

Description

Combined bearing and steam turbine

Technical Field

The utility model relates to a bearing technology, concretely relates to combination bearing and relevant steam turbine.

Background

In the existing mechanical equipment needing to use a thrust bearing and a radial bearing simultaneously, the thrust bearing and the radial bearing are designed in a split mode, a steam turbine is taken as an example, the existing technical scheme of the steam turbine bearing is various, generally, the radial bearing is most commonly in an elliptical tile bearing mode, and a thrust bearing is a fixed thrust sliding bearing. The bearing capacity of the oval tile radial bearing is low, the vibration resistance in the horizontal direction is poor, an upper oil film and a lower oil film can be generated when the rotor vertically shakes, and power consumption is high. The fixed thrust sliding bearing has uneven load distribution, insufficient compensation capacity for the conditions of misalignment, deflection and the like of the rotor, and low effective utilization rate of lubricating oil.

Disclosure of Invention

To the defect or not enough of prior art, the utility model discloses a combination bearing.

Therefore, the combined bearing disclosed by the utility model comprises a bearing body, wherein the bearing body comprises a side wall and a main shaft mounting hole which is axially arranged in the side wall; a first cavity and a second cavity are arranged on the inner wall of the main shaft mounting hole, an inclinable pad thrust bearing is mounted in the first cavity, and an inclinable pad radial bearing is mounted in the second cavity; at least one lubricating oil channel is formed in the side wall of the bearing body, a lubricating oil supply port is arranged outside each lubricating oil channel, and each lubricating oil channel is internally communicated with a first oil supply nozzle in the tilting pad thrust bearing and a second oil supply nozzle in the tilting pad radial bearing; an oil return channel is formed in the side wall of the bearing body, the oil return channel is internally communicated with the first cavity or/and the second cavity, and an oil return opening is formed in the oil return channel externally.

Further, the inner diameter of the first chamber is larger than the inner diameter of the second chamber.

Furthermore, a main tilting pad thrust bearing and an auxiliary tilting pad thrust bearing are axially arranged in the first cavity, a thrust disc installation space is reserved between the main tilting pad thrust bearing and the auxiliary tilting pad thrust bearing in the axial direction, and the axial distance of the reserved space is greater than the axial thickness of the thrust disc; and each lubricating oil channel pair is communicated with a first oil supply nozzle in the main tilting pad thrust bearing and a first oil supply nozzle in the auxiliary tilting pad thrust bearing.

Further, the tilting pad radial bearing comprises a plurality of radial tilting pads, wherein an oil through bolt is arranged between part of adjacent radial tilting pads, and a second oil supply nozzle is arranged at the end part of the oil through bolt facing the inside of the bearing body.

Further, an oil through bolt and an oil supply nozzle are arranged between adjacent radial tilting pads arranged in the lower half area of the bearing body.

Preferably, many lubricated oil ducts have been seted up in the bearing body lateral wall, and every lubricated oil duct is seted up along the axial and the radial of bearing body, and simultaneously, many lubricated oil ducts are located the lower half region of bearing body.

Preferably, the oil return passage is located in a lower half area of the bearing body.

Further, still include the bearing box, combination bearing installs in the bearing box.

The utility model discloses still provide the steam turbine who installs above-mentioned combination bearing simultaneously.

Compared with the prior art, the utility model has the advantages that:

the utility model discloses in concentrating a bearing body with tilting pad formula footstep bearing and tilting pad formula journal bearing, play the spacing and radial bearing's of axial effect respectively, the distance between two kinds of bearings diminishes simultaneously to a total oil inlet that can share has saved the space, makes compact structure.

In addition, the tilting pad type radial bearing pad block can swing up and down and the thrust bearing pad block can swing back and forth when viewed along the axial direction, an optimal oil wedge can be formed under various conditions, the high-speed stability is good, and oil film oscillation is not easy to occur; the oil spray holes are uniformly distributed in the middle of the bearing tile block, so that lubricating oil can be better and more quickly distributed on the surface of the tile block to form a better oil film.

Drawings

FIG. 1 is a schematic view of the main structure of the present invention;

FIG. 2 is a cross-sectional view A-A of FIG. 1;

FIG. 3 is a cross-sectional view B-B of FIG. 1;

fig. 4 is a schematic diagram of a tilting pad structure of the thrust bearing.

Detailed Description

Unless otherwise specified, the terminology herein is to be understood in light of the knowledge of one of ordinary skill in the relevant art.

The terms "axial" and "radial" as used herein refer to both axial and radial directions of the bearing body during operation; the "lower half-area" refers to the area of the bearing body which is located spatially below during operation.

The utility model discloses an integrated bearing body is with tilting pad thrust bearing and tilting pad journal bearing aggregate erection, establish first cavity and second cavity in the axial main shaft mounting hole lateral wall in the bearing body in the scheme, two regions are used for installing tilting pad thrust bearing and tilting pad journal bearing respectively, set up one or more lubricating-oil ducts in the bearing body lateral wall simultaneously, each lubricating-oil duct is internally communicated with the oil feed nozzle in the first cavity and the second cavity inner bearing, supply lubricating oil for each bearing during operation, each lubricating-oil duct is externally established the lubricating-oil supply mouth simultaneously; and an oil return passage is arranged in the bearing body, and the oil return passage is communicated with the first cavity or the second cavity or the two areas to collect redundant lubricating oil. Tilting pad thrust bearing and tilting pad journal bearing can adopt current inside to be equipped with the relevant bearing of oil feed nozzle, also can adopt the utility model discloses relevant bearing after the improvement.

In the specific scheme, the inner diameter of the first cavity in the bearing body is larger than that of the second cavity so as to be matched with and install the existing tilting pad thrust bearing and the tilting pad radial bearing.

In a specific scheme, a main tilting pad thrust bearing and an auxiliary tilting pad thrust bearing are axially arranged in a first cavity, a thrust disc mounting space is reserved between the main tilting pad thrust bearing and the auxiliary tilting pad thrust bearing in the axial direction, and the axial distance of the reserved space is greater than the axial thickness of a thrust disc so as to meet the axial moving space of a thrust bearing; on an oil path, each lubricating oil channel pair is communicated with a first oil supply nozzle in the main tilting pad thrust bearing and a first oil supply nozzle in the auxiliary tilting pad thrust bearing.

In some schemes, the utility model discloses a tilting pad piece radial bearing includes a plurality of radial tilting pads, wherein installs logical oil bolt between the adjacent radial tilting pad of part, leads to oil bolt and installs the oil feed nozzle towards the internal tip of bearing, and the lubricating oil in the lubricating oil duct supplies to the bearing internal through leading to oil bolt and oil feed nozzle promptly.

In order to improve the utilization efficiency of lubricating oil, the lubricating oil channel and the oil return channel are both positioned in the lower half area of the bearing body. In a more preferred embodiment, the oil return channel and the oil return opening are located at the bottom of the bearing body.

The following is a specific example provided by the inventor to further explain the technical solution of the present invention.

Example (b):

referring to fig. 1 to 4, the combined bearing of the embodiment includes a bearing body 1, a spindle mounting hole 11 is axially formed in the bearing body 1, a front end chamber, i.e., a first chamber, and a rear end radial bearing mounting chamber, i.e., a second chamber, are axially formed in an inner wall of the spindle mounting hole 11, and an inner diameter of the first chamber is larger than that of the second chamber; a plurality of lubricating oil channels 12 are axially arranged in the side wall of the lower half body of the bearing body 3, in this embodiment, 4 lubricating oil channels are arranged, and each lubricating oil channel is externally provided with an oil inlet 13; an oil return channel 14 communicated with the first cavity is arranged in the side wall of the bottom, and an oil return opening 15 is arranged outside;

referring to fig. 3, each of the main tilting pad thrust bearing 21 and the auxiliary tilting pad thrust bearing 22 includes a plurality of circumferentially installed axial thrust pads 29, an oil feed nozzle 23 is installed between adjacent circumferential thrust pads 29, the main tilting pad thrust bearing 21 and the auxiliary tilting pad thrust bearing 22 are installed in a front end cavity of the bearing body, i.e. a first cavity, and the outer diameter of a bearing disc of the thrust bearing is the same as the inner diameter of the cavity of the bearing body, so that the radial positioning effect is achieved; axial positioning the specific axial position is adjusted by adjusting the shim 27;

the main thrust bearing and the auxiliary thrust bearing can prevent the rotor from moving back and forth due to the action of axial thrust, avoid the friction between the rotor and other parts and the accident, the main thrust bearing prevents the rotor from moving backwards, and the auxiliary thrust bearing prevents the rotor from moving forwards; the main and auxiliary thrust bearings of this embodiment realize a tilting pad structure through the thrust pad 29, the bearing disc 26, the supporting block 28, the swinging block 25, the supporting point 25, etc., and as shown in fig. 4, the bearing disc 26 is installed in the bearing body 1, and the axial position is adjusted through the adjusting shim 27; the bearing block 28 is installed on the bearing disc, the pendulum block 25 (an upper pendulum block and a lower pendulum block) is installed on the bearing block 28 and regularly arranged, the thrust pad 29 and the bearing pad 24 are installed on the pendulum block 25 together, and the lower part of the bearing pad 25 is a spherical surface and is placed on the plane of the pendulum block 25, so that the thrust pad and the thrust pad can swing on the pendulum block at a certain angle, and a tilting pad structure is formed; the lubricating oil channel 12 is internally communicated with the first chamber, a lubricating oil inlet of the thrust bearing and an oil feeding nozzle 23, and lubricating oil flows to the tile surface through a hole of the oil feeding nozzle, so that the lubricating effect is achieved.

Referring to fig. 2, the radial bearing 3 of tilting pad block includes a plurality of radial tilting pads 31, between adjacent tilting pads located at the lower half of the bearing body, there are oil through bolts 32 and oil supply nozzles 33, each radial tilting pad 31 is located in the rear radial bearing installation cavity of the bearing body through the locating bolts 34 and its structure, the radial tilting pad 31 can swing in the bearing body at a certain angle, the above-mentioned lubricating oil channels 12 communicate with the second cavity and the oil through bolts 32, the lubricating oil is sprayed between the pad block and the main shaft through the oil through bolts and oil supply device to form an oil film for lubrication;

during operation, as shown by arrows in fig. 1, the lubricating oil respectively reaches the oil through bolts of the radial bearing and the oil supply nozzles in the thrust bearing through the oil inlet and the lubricating oil passage in the bearing body to realize the lubricating function of each bearing, and the redundant lubricating oil flows to the bearing box 4 through the oil return passage 14 and the oil return port 15.

The combined bearing of the embodiment is applied to a steam turbine, so that the lubricating effect can be improved, and the vibration of equipment can be reduced.

Claims

1. The combined bearing is characterized by comprising a bearing body, wherein the bearing body comprises a side wall and a main shaft mounting hole which is axially arranged in the side wall;

a first cavity and a second cavity are arranged on the inner wall of the main shaft mounting hole, an inclinable pad thrust bearing is mounted in the first cavity, and an inclinable pad radial bearing is mounted in the second cavity;

at least one lubricating oil channel is formed in the side wall of the bearing body, a lubricating oil supply port is arranged outside each lubricating oil channel, and each lubricating oil channel is internally communicated with a first oil supply nozzle in the tilting pad thrust bearing and a second oil supply nozzle in the tilting pad radial bearing;

an oil return channel is formed in the side wall of the bearing body, the oil return channel is internally communicated with the first cavity or/and the second cavity, and an oil return opening is formed in the oil return channel externally.

2. The combination bearing of claim 1, wherein the first chamber has an inner diameter greater than an inner diameter of the second chamber.

3. A combination bearing according to claim 1 or 2, wherein the primary tilting pad thrust bearing and the secondary tilting pad thrust bearing are axially mounted in the first chamber, and a thrust disk mounting space is reserved between the primary tilting pad thrust bearing and the secondary tilting pad thrust bearing in the axial direction, and the axial distance of the thrust disk mounting space is greater than the axial thickness of the thrust disk; and each lubricating oil channel pair is communicated with a first oil supply nozzle in the main tilting pad thrust bearing and a first oil supply nozzle in the auxiliary tilting pad thrust bearing.

4. The combination bearing of claim 1, wherein the radial tilt pad bearing comprises a plurality of radial tilt pads, wherein a portion of adjacent radial tilt pads have oil through bolts mounted therebetween, the oil through bolts having a second oil feed nozzle mounted toward an end within the bearing body.

5. A unit bearing according to claim 4, wherein oil feed bolts and oil feed nozzles are mounted between adjacent radially tiltable pads mounted in the lower half of the bearing body.

6. The combination bearing of claim 1, wherein a plurality of oil passages are formed in the side wall of the bearing body, each oil passage being formed in the axial and radial directions of the bearing body, and the plurality of oil passages are located in the lower half area of the bearing body.

7. The combination bearing of claim 1, wherein the oil return passage is located in a lower half area of the bearing body.

8. The combination bearing of claim 1, further comprising a bearing housing, wherein the combination bearing is mounted within the bearing housing.

9. A steam turbine comprising a turbine body, wherein the composite bearing of claim 1 is installed in the turbine.