GROUP ELECTROHYDRAULIC DRIVE FOR OIL-WELL SUCKER- ROD PUMPS (VERSIONS) Russian patent published in 2003 - IPC

FIELD: oil producing industry; oil-well sucker-rod pumps. SUBSTANCE: group electrohydraulic drive for oil- well sucker-rod pumps includes prime mover connected with hydraulic pump, hydraulic cylinders whose cavities are communicated by means of pipe line and control unit. It is additionally provided with reversible variable- capacity hydraulic pump fitted with electrohydraulic regulator. Control input of hydraulic pump is connected with output of control unit. Outlets of hydraulic pump are connected with other similar cavities of hydraulic cylinders by means of pipe lines. Besides that, group electrohydraulic drive includes prime mover connected with hydraulic pump, hydraulic cylinders whose similar chambers are communicated by means of pipe line, hydraulic distributor and control unit. It is additionally provided with variable-capacity hydraulic pump with electrohydraulic regulator. Control input of hydraulic pump is connected with first input of control unit. Inlet and outlet of hydraulic pump are connected with other similar chambers of hydraulic cylinders by means of pipe lines through hydraulic distributor. Control unit is provided with second output which is connected with control input of hydraulic distributor. Novelty of invention consists in realization of any law of motion of pistons of hydraulic cylinders. EFFECT: enhanced efficiency. 3 cl, 3 dwg