Dedicated electromagnetic torque-variable speed adjuster for oil pumping unit

Abstract

The invention relates to a dedicated electromagnetic torque-variable speed adjuster for an oil pumping unit. A bracket is fixed onto one end of a base; one side of the bracket is provided with a servo driver; the other end of the bracket is provided with a guide sleeve; an axially movable guide shaft is arranged in the guide sleeve; a screw rod connected with the servo driver is provided with a screw nut; the screw nut is fixed to the guide shaft; a connection sleeve is supported by an end head of the guide shaft through a sleeve shell and a bearing A; the connection sleeve is fixedly connected with a squirrel cage active rotor of which the periphery is conical surface-shaped; permanent magnets are fixed onto the surface of the inner hole of the conical surface of a permanent magnet passive rotor; the inner surfaces of the permanent magnets are matched with the outer surface of the squirrel cage active rotor; the two conical surfaces form an air gap; the permanent magnet passive rotor is connected with an output pulley; an input shaft is supported by bearings in the inner hole of the output pulley; the input shaft is inserted into the inner hole of the squirrel cage active rotor; and the input shaft and the squirrel cage active rotor are relatively fixed in a circumferential direction and are connected with each other in a manner that the input shaft and the squirrel cage active rotor can axially slide relatively; and a connecting hole is formed at one end head of the input shaft. The dedicated electromagnetic torque-variable speed adjuster for the oil pumping unit has the advantages of structure simple, real-time control of the up and down stroke speed of the oil pumping unit, servo adjustment of the number of the strokes of the oil pumping unit and long service life.

Description

technical field [0001] The invention relates to a speed governor, in particular to an electromagnetic torque conversion speed governor dedicated to a pumping unit. Background technique [0002] At present, the main equipment in the oil field oil production industry is the pumping unit, most of which are directly driven by the motor to drive the pulley, with constant speed and the same speed of up and down strokes. Changes in downhole working conditions will cause changes in up and down travel speeds and loads, which will cause damage to motors or other drive components in the current direct drive mode. Connecting the motor and the load through a magnetic coupling seems to be able to solve the above problems, but the existing magnetic coupling cannot control the stability of the speed and cannot be used on the pumping unit. Therefore existing pumping unit driving parts are easily damaged, and the service life is short. Contents of the invention [0003] The purpose of the...

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Problems solved by technology

Connecting the motor and the load through a magnetic coupling seems to be able to solve the above problems, but the existing magnetic coupling cannot control the

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