Method and apparatus for protecting motor shaft in high voltage difference circumstance

Abstract

The present invention discloses a motor shaft protecting method and a device under the high pressure difference environment. The method is to arrange a motor in a sealed external tube; a motor shaft can be connected with a coupler through an axially sliding key and the coupler is connected with a connecting slot on an output shaft through a connecting boss so as to ensure the motor to transmit rotary moment onto the output shaft; the inner hole of the external tube is provided with steps; the output shaft is provided with a thrust bearing so as to transmit the axial thrust onto the steps of the inner hole of the external tube through the thrust bearing, a bearing disc, a support frame and a flange disc and prevent the axial thrust of the output shaft from being transmitted onto the motor shaft. The present invention can prevent the external pressure from directly being transmitted onto the motor shaft, avoid the damages of the motor shaft and the bearing and prolong the service life of the motor. The present invention can also reduce the friction force on a seal part of the output shaft caused by the pressure difference, improve the effective output torque of the motor and prolongthe service life of the seal part. The present invention is particularly applicable to underground measuring instruments.

Description

technical field [0001] The invention relates to a motor shaft protection technology, in particular to a method and a device for protecting a motor shaft in a high pressure difference environment. Background technique [0002] There is a motor in the instrument used for downhole measurement, which drives the actuators in the downhole instrument to work. Due to the high pressure environment underground, the working conditions of the motor are harsh. When the motor drives the external components to move, the output shaft of the motor will bear a huge pressure difference. If the force generated by the pressure difference is directly transmitted to the motor shaft, it will cause damage to the motor shaft and bearings, and seriously shorten the working life of the motor. The pressure difference produces a large friction force on the output shaft seal, which reduces the effective output torque of the motor, and the generation of wear and heat shortens the working life of the seal....

AI Technical Summary

Problems solved by technology

If the force generated by the pressure difference is directly transmitted to the motor shaft, it will cause damage to the motor shaft and bearings, and seriously shorten the working life of the motor

The pressure difference produces a large friction force on the output shaft seal, which reduces the effective output torque of the motor, and the generation of wear and heat shortens the working life of the seal.

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