SUCKER-ROD WELL PUMP Russian patent published in 1997 - IPC

FIELD: oil industry. SUBSTANCE: pump has plunger with rod, discharging unit and units for delivery and sucking valves. The top end of the cylinder of the pump is a cone diverging upward and provided with lateral opening which communicates the inner space of the cylinder with a well. The rod of the pump is provided with valving member made up as truncated cone with opening along the axis of the cone. The cone is fitted on the rod with a spaced relation. The area of the cross-section of the opening of the valve exceeds the area of the cross-section of the openings of the valves. Above the valving member on the rod is hollow cylinder having knurled outer side and through longitudinal openings on the ring surface. The bottom end face of the hollow cylinder is step and has a ring stop whose inner diameter exceeds the diameter of the through openings. EFFECT: enhanced delivery. 1 dwg