DOWNHOLE PUMP UNIT WITH SUBMERSIBLE MULTISTAGE PUMP OF ROTOR-PISTON TYPE ON THE BASIS OF RYL HYDRAULIC MACHINE Russian patent published in 2021 - IPC F04C11/00 F04C2/344 

FIELD: engines and pumps.

SUBSTANCE: invention relates to well pumping units with submersible multi-stage pump. Unit includes a pump consisting of at least two pump stages sequentially located along the pump shaft, each of which contains working elements. Each stage is made in form of Ryl hydraulic machine and includes stator 1 with cylindrical working chamber, in which cylindrical rotor 2 with odd number of longitudinal cylindrical grooves symmetrically arranged relative to rotation axis is installed eccentrically as working members, in each of which piston 3 made in form of a curved prism is installed without limit. Through-holes oriented in axial direction are made in working elements. Guide device is made in the form of end cover 6 with located on it opening 9, which is outlet for previous and inlet for next adjacent section.

EFFECT: invention is aimed at simplification and reduction of axial size, higher efficiency and wider range of efficiency, to ensure stable operation at high gas content.

1 cl, 1 dwg