Bore hole lifting pump

摘要

The object of the invention is to specify a bore hole lifting pump which has a plunger-cylinder couple in which the seepage of the liquid is strongly reduced. According to the invention this object can be achieved by the bushes, in order to ensure a permissible gap in the plunger/cylinder couple, being movable relative to one another in a radial direction, the displacement preferably being arranged in such a way that the angle formed by the displacement directions of two adjacent bushes is in the range of 170-190 DEG . The invention relates to a bore hole lifting pump, comprising a plunger, a plurality of valves and a cylinder in which bushes are situated, the cylinder at its ends being fastened to a casing by means of screwing, with the aid of separate elements. The pump is intended to be used in the petroleum industry for pumping liquids from bore holes with sucker rod pumping installations.