CN211737797U

CN211737797U - Pumping type bearing thrust disc

Info

Publication number: CN211737797U
Application number: CN201921437736.XU
Authority: CN
Inventors: 袁潮潋; 沈玉仙; 蒋泰铿; 陈彰桥; 杨全程; 苏恒; 张宇凡; 林淞; 陈勇
Original assignee: CNNC Fujian Nuclear Power Co Ltd
Current assignee: CNNC Fujian Nuclear Power Co Ltd
Priority date: 2019-08-30
Filing date: 2019-08-30
Publication date: 2020-10-23
Anticipated expiration: 2029-08-30

Abstract

The utility model belongs to the technical field of the thrust bearing design of the large-scale heavy load machinery of electric power industry, concretely relates to pump type bearing thrust dish can improve the bearing security by a wide margin, especially provides extra cooling to the friction pair under the unilateral heavy load condition. The inner ring of the thrust disc is provided with a certain number of pumping holes along the circumferential direction, and the pumping holes penetrate through the main thrust tile and the auxiliary thrust tile to rub the inner side oil inlet edge of the auxiliary thrust tile. The thrust disc is arranged on the shaft, is matched with the main thrust pad and the auxiliary thrust pad and can bear axial force in two directions; when the axial force is upward, the main thrust pad and the thrust disc are matched to bear the axial force; when the axial force is downward, the auxiliary thrust pad is matched with the thrust disc to bear the axial force. The utility model discloses can realize making bearing steady operation in fluid lubrication state, improve the bearing security to the vice extra cooling of friction.

Description

Pumping type bearing thrust disc

Technical Field

The utility model belongs to the technical field of the thrust bearing design of the large-scale heavy load machinery of electric power industry, concretely relates to pump type bearing thrust dish can improve the bearing security by a wide margin, especially provides extra cooling to the friction pair under the unilateral heavy load condition.

Background

The main pumps of the Fuqing No. 5 and 6 machine sets adopt a three-bearing structural design, namely, the upper part and the lower part of a motor shaft and the lower part of a pump shaft are respectively provided with a set of radial bearings, the motor and a water pump share an oil-lubricated bidirectional thrust bearing, and the bidirectional high-pressure jacking oil is equipped, so that the axial water thrust, the system pressure and the rotor gravity under various system pressures can be borne.

The bearing lubrication state includes: fluid lubrication, mixed lubrication, boundary lubrication, dry friction and the like. In order to ensure the operation safety of the bearing, the bearing is required to stably operate in a fluid lubrication state. Under the working condition of constant sliding speed, the bearing specific pressure is reduced or the lubricating oil viscosity is increased, so that the bearing can run in a fluid lubrication state. However, in order to ensure the efficiency of the unit, the size of the bearing cannot be increased continuously, and the specific pressure cannot be reduced, so that the requirement on the cooling of the bearing is high. The traditional design idea mainly comprises the steps of increasing the flow of lubricating oil, improving the power of a heat exchanger and adjusting the flow or temperature of a cold source, and the methods need to change the design of equipment or a system in a large range and are difficult to realize. The utility model discloses can realize the vice extra cooling of friction under the condition of the design of small range change thrust disc.

Disclosure of Invention

An object of the utility model is to provide a pump-type bearing thrust disc can realize making the bearing steady operation in fluid lubrication state, improves the bearing security to the vice extra cooling of friction.

In order to achieve the above purpose, the utility model adopts the technical proposal that:

the pumping bearing thrust disc has inner ring with several pumping holes, which are made to penetrate through the inner side oil inlet edge of the friction pair between the main thrust tile and the auxiliary thrust tile.

The thrust disc is arranged on the shaft, is matched with the main thrust pad and the auxiliary thrust pad and can bear axial force in two directions; when the axial force is upward, the main thrust pad and the thrust disc are matched to bear the axial force; when the axial force is downward, the auxiliary thrust pad is matched with the thrust disc to bear the axial force.

When the shaft rotates, the thrust disc is driven to rotate synchronously, under the action of centrifugal force, lubricating oil in the pumping hole moves from the near end to the far end away from the rotation axis of the shaft to form continuous flow from the lower end of the thrust disc to the upper end surface, the phenomenon is called pumping effect of the pumping hole, and the pumping effect pumps cold oil on the side of the auxiliary thrust pad with relatively low working temperature to the friction auxiliary working surface of the main thrust pad to provide additional cooling for the main thrust pad.

The utility model discloses the beneficial effect who gains does:

compare traditional thrust disc design, this kind of thrust disc can be with the relatively lower vice thrust tile side cold oil pumping of operating temperature to main thrust tile friction pair working face of providing extra cooling, obviously reduces the axle bush temperature.

Drawings

FIG. 1 is a schematic view of a thrust plate of a pumping bearing;

FIG. 2 is a schematic diagram I of the working principle;

FIG. 3 is a schematic view of the working principle II;

in the figure: 1. a shaft; 2. a main thrust pad; 3. a thrust disc; 4. a pumping hole; 5. and an auxiliary thrust pad.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

As shown in figure 1, a pump-delivery type bearing thrust disc, the non-carrying end of the 3 inner circles of thrust disc processes the pump-delivery hole 4 of a certain amount along circumference, link up the inboard oil feed limit of main thrust tile 2 and the 5 friction pairs of vice thrust tiles.

The utility model discloses use with two-way thrust bearing cooperation, the theory of operation is as shown in figure 2, figure 3. The thrust disc 3 is mounted on the shaft 1, and can bear axial forces in two directions by being matched with the main thrust pad 2 and the auxiliary thrust pad 5. When the axial force is upward, the main thrust pad 2 and the thrust disc 3 are matched to bear the axial force; when the axial force is downward, the auxiliary thrust pad 5 is matched with the thrust disc 3 to bear the axial force. The inner ring of the thrust disc 3 is provided with a certain number of pumping holes 4 along the circumferential direction, and the pumping holes penetrate through the main thrust tile 2 and the auxiliary thrust tile 5 to rub against the inner side oil inlet edge of the auxiliary thrust tile.

When the shaft 1 rotates, the thrust disc 3 is driven to rotate synchronously, and under the action of centrifugal force, lubricating oil in the pumping hole 4 of the thrust disc 3 moves from the near end to the far end away from the rotating axis of the shaft 1 to form continuous flow from the lower end of the thrust disc 3 to the upper end face. This phenomenon, known as the pumping effect of the pumping bore 4, pumps cold oil from the side of the secondary thrust shoe 5, which is at a relatively low operating temperature, to the friction secondary working surface of the primary thrust shoe 2, providing additional cooling of the primary thrust shoe 2.

Claims

1. A pumping type bearing thrust disc, comprising: the inner ring of the thrust disc is provided with a certain number of pumping holes along the circumferential direction, and the pumping holes penetrate through the main thrust tile and the auxiliary thrust tile to rub the inner side oil inlet edge of the auxiliary thrust tile.

2. The pumparound bearing thrust disc of claim 1, wherein: the thrust disc is arranged on the shaft, is matched with the main thrust pad and the auxiliary thrust pad and can bear axial force in two directions; when the axial force is upward, the main thrust pad and the thrust disc are matched to bear the axial force; when the axial force is downward, the auxiliary thrust pad is matched with the thrust disc to bear the axial force.