CN111431336A

CN111431336A - Thrust bearing for high-voltage submersible motor and high-voltage submersible motor

Info

Publication number: CN111431336A
Application number: CN202010184819.3A
Authority: CN
Inventors: 曹卫东
Original assignee: Fluid Engineering Equipment Technology Of Jiangsu University Zhenjiang; Jiangsu University
Current assignee: Fluid Engineering Equipment Technology Of Jiangsu University Zhenjiang; Jiangsu University
Priority date: 2020-03-17
Filing date: 2020-03-17
Publication date: 2020-07-17

Abstract

The invention provides a thrust bearing for a high-voltage submersible motor, which is positioned at the lower part of the high-voltage submersible motor, wherein the high-voltage submersible motor comprises a motor rotor and a lower guide bearing seat; the thrust bearing includes: the top of the thrust bearing seat is provided with a lower tilting pad block, and the lower tilting pad block is used for bearing the downward axial force of the motor rotor; the upper thrust bearing is a detachable tilting pad block and is used for being connected with the lower guide bearing seat and bearing the upward axial force of the motor rotor; the sliding plate is arranged between the thrust bearing seat and the upper thrust bearing, a plurality of straight blades are uniformly distributed on the upper end face of the sliding plate, and the sliding plate is used for being in transmission connection with a motor rotor. The thrust bearing of the high-voltage submersible motor has a compact and reasonable structure, so that the reliability of the high-voltage submersible motor is improved.

Description

Thrust bearing for high-voltage submersible motor and high-voltage submersible motor

Technical Field

The invention relates to the technical field of high-voltage submersible motors, in particular to a thrust bearing for a high-voltage submersible motor and the high-voltage submersible motor.

Background

The high-voltage submersible motor is an inner water-filling type explosion-proof high-voltage motor for providing power for a multi-stage emergency drainage pump, the common voltage level is 6KV or 10KV, and the rotating speed is 1475r/min or 980 r/min. The motor rotor and the pump rotor of the high-pressure submersible motor are connected by a rigid coupling, the axial resultant force of the motor rotor and the pump rotor is borne by a thrust bearing in the motor, and the thrust bearing comprises a sliding plate, a tilting pad, an upper thrust bearing and the like. The axial force of the pump rotor is mainly generated by the action of the water flow pressure in the pump on the end face of the tail end of the pump shaft, the axial force of the submersible motor rotor is usually fixed, the magnitude of the axial resultant force of the unit rotor depends on the stage number of the emergency drainage pump, generally, the larger the number of pump stages is, the larger the magnitude of the axial resultant force of the rotor is, and the larger the force which needs to be borne by the bearing is. When the traditional submersible motor is used and the axial resultant force of a rotor is large, the abrasion degree of the surfaces of a sliding plate and a tilting pad of a thrust bearing is increased, and the abrasion speed is accelerated.

Disclosure of Invention

In order to solve the technical problem, the invention discloses a thrust bearing for a high-voltage submersible motor, which is positioned at the lower part of the high-voltage submersible motor, wherein the high-voltage submersible motor comprises a motor rotor and a lower guide bearing seat; the thrust bearing includes:

the top of the thrust bearing seat is provided with a lower tilting pad block, and the lower tilting pad block is used for bearing the downward axial force of the motor rotor;

the upper thrust bearing is a detachable tilting pad block and is used for being connected with the lower guide bearing seat and bearing the upward axial force of the motor rotor;

the sliding plate is arranged between the thrust bearing seat and the upper thrust bearing, a plurality of straight blades are uniformly distributed on the upper end face of the sliding plate, and the sliding plate is used for being in transmission connection with a motor rotor.

In a second aspect, the invention discloses a high-pressure submersible motor, which applies the thrust bearing.

By adopting the technical scheme, the invention has the following beneficial effects:

according to the invention, the straight blades are designed on the upper surface of the sliding plate, the tilting pad tile is added on the lower guide bearing, when the rotor rotates at a high speed, the water pressure of one side of the sliding plate with the straight blades is lower than the pressure of a main flow area, the load on the lower surface of the sliding plate can be reduced, the centrifugal action of the straight blades on the upper surface of the sliding plate on the water flow is utilized to reduce the pressure of the water flow on one side of the upper surface of the sliding plate, the load of the lower half part of the thrust bearing is reduced, and the axial.

The upper thrust bearing is changed into the detachable tilting pad, so that the bearing capacity of the upward axial force is greatly improved.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a front sectional view of a high voltage submersible motor embodying the present invention;

FIG. 2 is a schematic view of a slide plate in a thrust bearing of the high-pressure submersible motor of the present invention;

fig. 3 is a schematic diagram of an upper thrust bearing in a thrust bearing of a high-pressure submersible motor.

The following is a supplementary description of the drawings:

201. an upper radial sliding bearing; 202. a motor rotor; 203. a motor stator; 204. a lower radial sliding bearing; 205. a lower guide bearing seat; 206. an upper thrust bearing; 207. a cooler; 208. a centrifugal impeller; 209. a thrust bearing seat; 210. a lower tilt pad; 211. a slide plate; 212. an electrical cable.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1:

referring to fig. 1-3, a thrust bearing for a high-pressure submersible motor is arranged at the lower part of the high-pressure submersible motor which runs vertically, the bottommost part of the thrust bearing is a thrust bearing seat 209, and a lower tilting pad 210 is connected with the thrust bearing seat 209 through a screw; the middle part of the thrust bearing is a sliding plate 211, and the sliding plate 211 and the motor rotor 203 synchronously rotate and are tightly connected; the upper part of the sliding plate 211 is provided with an upper thrust bearing 206, the upper thrust bearing 206 is connected with a lower guide bearing seat 205 through a screw, and the upper end surface of the sliding plate 211 is provided with a plurality of straight blades which are uniformly distributed; the upward axial force of the motor rotor 203 is borne by the upper thrust bearing 206; the downward axial force of the motor rotor 203 is borne against the lower tilt pad 210.

In this embodiment, a plurality of straight blades are uniformly distributed on the upper end surface of the sliding plate 211, and under the centrifugal rotation action of the straight blades of the sliding plate 211 on water flow, the fluid pressure on one side of the upper end surface of the sliding plate 211 is lower than the pressure of a main flow area on the periphery of the sliding plate, and the additional water thrust of the design can partially balance the downward axial acting force of the motor rotor, reduce the load of the thrust bearing seat 209 and prolong the service life of the sliding plate 211 and the lower tilting pad 210. Meanwhile, the original upper thrust bearing 106 is replaced by the upper thrust bearing 206 with stronger bearing capacity, in particular to a detachable tilting pad.

The thrust bearing of the high-voltage submersible motor has a compact and reasonable structure, so that the reliability of the high-voltage submersible motor is improved.

A high-pressure submersible motor is provided, and the thrust bearing is applied. The high-voltage submersible motor comprises a cable, a radial sliding bearing, a tilting pad, a sliding plate, a centrifugal impeller, a single-end-face mechanical seal, a lower guide bearing, a rotor, a stator, a cooler and the like, and the detailed structure is shown in figure 1.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. A thrust bearing for a high-pressure submersible motor, the thrust bearing being in the lower part of the high-pressure submersible motor, wherein the high-pressure submersible motor comprises a motor rotor (203) and a lead-down bearing seat (205); characterized in that said thrust bearing comprises:

a thrust bearing seat (209), wherein a lower tilting pad (210) is arranged at the top of the thrust bearing seat (209), and the lower tilting pad (210) is used for bearing the downward axial force of the motor rotor (203);

the upper thrust bearing (206) is a detachable tilting pad, and the upper thrust bearing (206) is used for being connected with the lower guide bearing seat (205) and bearing the upward axial force of the motor rotor (203);

the sliding plate (211), sliding plate (211) set up in thrust bearing frame (209) with go up between thrust bearing (206), sliding plate (211) upper end design has evenly distributed's several straight blade, sliding plate (211) are used for being connected with motor rotor (203) transmission.

2. A high-pressure submersible motor, characterized in that a thrust bearing according to claim 1 is applied.