Double-thrust-bearing device for motor protector of electric submersible pump unit

Abstract

The invention discloses a double-thrust-bearing device for a motor protector of an electric submersible pump unit. The double-thrust-bearing device comprises a single-thrust-bearing device and is characterized in that a lower section cylinder body extends from the lower portion of a bearing seat of the single-thrust-bearing device; a low-level upper positioning block, a low-level lower positioning block, a low-level supporting pipe, a pressure spring, a pressure spring retainer ring, a low-level mobile block and a low-level lower immobile block are mounted inside the lower section cylinder body; the low-level mobile block is connected with the low-level supporting pipe through a buckle sleeve; an upper supporting sleeve is connected with the low-level supporting pipe in a key transmission manner; the low-level mobile block is kept to have a distance from a circular ring-shaped disc; the low-level lower immobile block is mounted on the low-level upper positioning block; the lower part of the low-level upper positioning block is fixedly connected with the pressure spring retainer ring and a round nut in a key connection manner; the round nut is screwed in an internal thread on the lower part of the lower section cylinder body; the pressure spring is mounted between the pressure spring retainer ring and a shaft shoulder of the low-level positioning block. The double-thrust-bearing device disclosed by the invention has the advantages that two stages of high-load thrust bearings are balanced in loading, and the original running characteristic of high temperature resistance of the high-load thrust bearings is maintained.

Description

[0001] Technical field: [0002] The invention relates to a submersible oil pump, in particular to a double thrust bearing device of a motor protector of a submersible electric pump unit. [0003] Background technique: [0004] The submersible electric pump unit is mainly used for pumping oil in deep wells. The axial load of the motor shaft is much larger than that of conventional water pumps, so the axial thrust bearing used in it bears high load (the motor protector needs to bear 2.5-5 tons of thrust ). [0005] The submersible electric pump unit is composed of a submersible motor, a motor protector, an oil-gas separator, and a pump body. After the motor shaft extends into the motor protector, it drives the oil-gas separator and the pump body to run, so the thrust bearing device is installed in the motor protector. Conventional thrust bearings use ball and roller bearings. Because the rolling friction is multi-point or multi-line contact with the bearing ring and the load i...

AI Technical Summary

Problems solved by technology

Conventional thrust bearings use ball and roller bearings. Because the rolling friction is multi-point or multi-line contact with the bearing ring and the load is small, it cannot be applied to the submersible electric pump unit. The submersible electric pump unit uses sliding friction high load thrust bearings

Images