DIFFERENTIAL PUMPING UNIT Russian patent published in 2005 - IPC

FIELD: oil producing industry.

SUBSTANCE: device is designed for driving deep-well sucker-rod pumps. In proposed differential pumping unit differential crank mechanism is used as transforming mechanism providing straight-line reciprocation of point of attachment of tension pulley on drive crank. Said transforming mechanism is installed on output shaft of reduction gear from one side. Post with guide pulley is arranged at this side also. Axle of part is in vertical plane passing through axis of reduction gear output shaft. Radii of central and drive cranks are equal to each other. Tension pulley is mounted of drive crank over which flexible member is passed. Said tension pulley is coupled through guide pulley installed on post with polished rod carrier bar. Cranks are interconnected and they rotate in different directions. Length of stroke is equal to sum of four radii of cranks. Pumping units are most efficiency at length of stroke from 2.5 to 5 m.

EFFECT: provision of larger length of stroke at more rational design.

3 cl, 3 dwg