Oil-submersible linear motor

Abstract

The invention discloses a submersible linear motor, comprising a stator and a rotor which motions linearly in the stator; the rotor comprises a shaft, a permanent magnetic ring, a magnetic-guiding ring and a second position limit ring; the permanent magnetic ring and the magnetic-guiding ring are arranged on the shaft in the form of array; the second position limit ring is fixedly fastened on the shaft so that axial position limiting is carried out on the permanent magnetic ring and the magnetic-guiding ring; the submersible linear motor fixedly fastens the second position limit ring on the shaft of the rotor, and the axial position limit is carried out on the permanent magnetic ring and the magnetic-guiding ring on the shaft by the second position limit ring, so that the permanent magnetic ring and the magnetic-guiding ring can be kept at the initial design, and the change of the magnetic passage and the polar moment caused by the movement of the permanent magnetic ring and the magnetic-guiding ring is avoided, thus leading the motor to work normally for a long time, thereby avoiding the detection, maintenance on the rotor and saving the expense.

Description

technical field [0001] The invention relates to an oil submersible linear motor, in particular to an oil submersible linear motor used for working in an oil well. Background technique [0002] Known oil pumping equipment mainly is beam pumping unit-oil well pump device, and whole set of equipment is divided into ground, downhole and the middle part of contacting ground and downhole, but it all is mechanical oil recovery. Due to the complex and changeable oil well production conditions, with the continuous increase of well depth and production, the disadvantages of this pumping unit, such as heavy weight, many accidents and low displacement, become very obvious. The disadvantages are as follows: [0003] 1. High energy consumption: Due to the complex mechanical structure of traditional mechanical oil extraction, the power factor of the motor is very low, generally between 20% and 50%; There is an elastic deformation of about 0.6-1.2 meters, which seriously affects the system...

AI Technical Summary

Problems solved by technology

[0003] 1. High energy consumption: Due to the complex mechanical structure of traditional mechanical oil extraction, the power factor of the motor is very low, generally between 20% and 50%; There is an elastic deformation of about 0.6-1.2 meters, which seriously affects the system efficiency

[0004] 2. Eccentric wear is easy to occur: since the well depth of most oil fields is more than 1,000 meters, when the sucker rod is worn off, it seriously affects the reliability of the system

[0005] 3. It is not environmentally friendly and has a lot of noise; during offshore oil extraction, due to the leakage of crude oil, it will cause crude oil to pollute the ocean

[0006] 4. The system is complex: the main modules of the system are separated, the system coordination is poor, and it is inconvenient to control together

However, after the mover moves back and forth for many times, the magnetic ring and steel ring will move, which will change the magnetic circuit and pole moment of the whole mover, and affect the normal operation of the mover

At this time, maintenance personnel have to detect the magnetic ring and steel ring that have moved and adjust them to the original design position, which will cost a lot of manpower and material resources

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