Device capable of automatically adjusting balance in operation of asynchronous motor beam pumping unit

Abstract

The invention belongs to the field of oilfield oil extraction equipment, and particularly relates to a device capable of automatically adjusting balance in the operation of an asynchronous motor beampumping unit. The device includes a balance weight and a balance block, the balance weight is installed at the tail of a pumping unit beam, the balance block is mounted on a pumping unit crank, the tail of the pumping unit beam is fixedly provided with a balance weight driver, the balance weight is installed on an output shaft of the balance weight driver, the power of the balance weight driver issupplied by a pumping unit motor, the balance weight reciprocatingly swings in a vertical plane under the action of the balance weight driver, and the period of the reciprocating swing is the same asthe rotation period of the pumping unit crank. Compared with compound balance pumping units in prior art, the device is provided with the balance weight which can perform the balance function in linewith the balance block on the pumping unit crank, so that the balance adjustment effect of the balance weight is maximized.

Description

technical field [0001] The invention belongs to the field of oil production equipment in oilfields, and in particular relates to an automatic adjustment balance device during operation of an asynchronous motor beam pumping unit. Background technique [0002] Beam pumping unit is a commonly used oil extraction equipment. Its structure includes motor, reducer, crank, connecting rod, beam, donkey head and bracket. The middle part of the beam is hinged on the upper end of the bracket, and the donkey head is fixedly connected At one end of the beam, when the pumping unit is running, the power of the motor is transmitted to the reducer, and the reducer outputs the power and drives the crank to rotate, and the rotating crank pulls the beam to swing up and down through the connecting rod to complete the oil pumping action. [0003] The working characteristic of this kind of pumping unit is to bear the alternating load, upstroke, the donkey head of the pumping unit bears the weight o...

AI Technical Summary

Problems solved by technology

However, in the prior art, the counterweight is fixedly connected to the beam of the pumping unit. Although the counterweight with this installation structure reduces the peak value of the net torque curve of the pumping unit to a certain extent, it plays a certain role in energy saving. effect, but no matter how it is adjusted, the balance rate of the pumping unit can usually only be controlled at a level of about 85%, and the balance adjustment effect needs to be improved

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