WELL PUMP SET Russian patent published in 2014 - IPC F04B47/00 

FIELD: engines and pumps.

SUBSTANCE: invention relates to the field of pump equipment and may be used to lift fluid from large depth. A well pump set comprises lifting pipes, a plunger pump, comprising a cylinder, a plunger, a driving rod, a suction and an injection valves and driven by a drive comprising a reversible electric motor, a rolling screw-motion drive with a driving rod placed in an oil-filled body comprising an elastic shell, dampers, besides, the driving rod is connected with the plunger and is compacted in the body. The novelty is the fact that the plunger is made hollow and stepped, the lower step of the plunger has smaller diameter than the upper step, and is compacted in the cylinder, forming a circular injection cavity, and the cylinder is tightly enclosed into the jacket and equipped with an additional cavity, communicating with the suction cavity above the plunger via a relief valve, and with the lifting pipes cavity - via an injection valve, besides, the additional cavity communicates with the circular cavity along the channel formed between the jacket and the cylinder, and holes made in the lower part of the cylinder, and the suction valve is located in the upper part of the plunger.

EFFECT: provision of fluid lift from large depth.

1 dwg