MOVABLE-ELECTRODE TUBE OIL PUMPING UNIT Russian patent published in 2002 - IPC

FIELD: drives of oil-well sucker rod pump units directly articulated with casing pipes. SUBSTANCE: movable-electrode tube oil pumping unit includes electric motor, screw converter for conversion of rotary motion to translational motion and energy recuperator containing pneumatic cylinders and receivers. Said movable-electrode tube oil pumping unit is provided with electric motor mounted on housing. Electric motor shaft is articulated with screw of screw converter mounted in bearings. Motion nut of screw converter is articulated with motion rods running in through holes of end shield and connected with axial force transfer member. Pneumatic cylinder body is connected with movable-electrode tube oil pumping unit housing; piston rod of pneumatic cylinder is received by through hole of end shield and is articulated with axial force transfer member. Ends of exhaust branch pipes of pneumatic cylinder are received by holes of electric motor protective casing. EFFECT: reduced mass of pumping unit; increased service life. 6 cl, 1 dwg