OIL-WELL ELECTRIC PLUNGER PUMPING UNIT Russian patent published in 2003 - IPC

FIELD: oil and gas producing industries. SUBSTANCE: invention is designed for lifting oil from oil wells and pumping out condensate from gas wells. Proposed unit contains pump with plunger set into reciprocation by submersible electric motor through reversible transfer mechanism. The latter consists of gear train and paired crank gear on end journal of which connecting rod with idling energy accumulator in form of spring is installed. Paired crank gear is made in form of two similar parallel wheels with common end journals being last stage of gear mechanism with similar gear ratios from gear wheels to electric motor shaft. Gear wheels have common axis of rotation being installed on bearings on separate axles secured in housing by means of segment inserts. Slider is installed between connecting rod of reversible transfer mechanism and movable part of pump. Upper part of reversible transfer mechanism is provided with excess pressure discharge check valve installed over diaphragms. EFFECT: simplified design. 1 dwg