SUBMERSIBLE MULTISTAGE CENTRIFUGAL PUMP Russian patent published in 2004 - IPC

FIELD: oil producing industry.

SUBSTANCE: invention relates to pumps designed for lifting liquids from wells. Proposed pump contains stages with guide vane assemblies in which main axial supports made of wear-resistant material with covers and impellers are mounted. Each impeller has its own axial support being a seal dividing suction and discharge spaces. Axial support is made in form of bead projecting on end face of impeller and resting on surface of cover. Shaft of pump is non-round in section and it carries hub of impeller fitted with clearance and separating washers made of antifriction material and provided with holes corresponding to non-found section of shaft. Hub of impeller is made projecting over end face of last impeller from side of inlet. Separating washers are installed on shaft for axial displacement at both sides from impeller hub. Thickness of each separating washer is less than axial clearance formed by end face of hub and end face of main axial support. Guide vane assembly with main axial support is installed before first impeller. End face of main axial support pointed to impeller side forms, together with separating washer, axial clearance whose size is less than height of bead of additional support of impeller.

EFFECT: increased service life of pump owing to prevention of destruction of first impeller.

1 dwg