HYDRAULIC DRIVE FOR DEEP-WELL SUCKER-ROD PUMP Russian patent published in 2006 - IPC F04B47/04 

FIELD: oil industry.

SUBSTANCE: hydraulic drive comprises fluid-operated cylinder with piston and rod for connecting the piston with the rod column of the pump, tank for fluid, and power pump. The reverse system has top and bottom switches that cooperate with the rod and electromagnetic hydraulic switch that is controlled by the switches and supplies the fluid to the hydraulic distributor. The hydraulic drive is provided with the hydraulic motor having flywheel. The input of the hydraulic motor is connected with the tank and hydraulic distributor to connect it with the under-piston space of the hydraulic cylinder when the piston moves down. The output of the hydraulic motor is connected with the line for supplying fluid from the power pump to the hydraulic distributor. To relief the hydraulic system at the moment of start of the electric motor of the power pump and to restrict the maximum pressure in the hydraulic system when it operates, the hydraulic drive is provided with the safety valve mounted in the line that connects the line for supplying the fluid from the pump to the hydraulic distributor with the line for returning the fluid from the pump to the tank.

EFFECT: enhanced reliability and simplified structure.

1 cl, 1 dwg