OIL WELL PUMP DRIVE Russian patent published in 2015 - IPC F04B47/02 

FIELD: oil-and-gas industry.

SUBSTANCE: pump drive contains an engine, a reducer, a mechanism converting the rotary into the reciprocating motion. The latter comprises the driving and driven pulleys overlapped by a continuous flexible link connected with the carriage connected to the counterbalance connected through a flexible link with a rod suspension unit. Axes of the converting mechanism, of the counterbalance and the flexible link are located near the same vertical plane. The top driven pulley is installed in the housing with a possibility of rotation and limited movement along the axis of the converting mechanism. The tension mechanism consisting of a mobile housing with an axle of the pulley installed on a longitudinal skid of the housing and connected to a pusher, is used to adjust the tension of the continuous flexible link. The tension mechanism pusher is designed as hydraulic pair cylinder - piston the mobile part of which supports the housing of the top pulley. The tension mechanism is designed as a hydraulic plunger or a piston pump interconnected through the delivery valve with the pusher cylinder which is interconnected with the feeding vessel interconnected through the suction valve with the pump. The mobile part of the latter is fitted with a weight which is selected with a possibility of movement of the pusher mobile part when the tension of the continuous flexible link falls below the selected tension value. Service life of the flexible link and the drive in general is increased, and also dynamic loads of the borehole equipment are decreased.

EFFECT: labour input and costs of service of the drive are decreased.

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