DISPERSING STAGE OF SUBMERSIBLE MULTISTAGE CENTRIFUGAL PUMP Russian patent published in 2003 - IPC

FIELD: oil producing industry; oil well machinery. SUBSTANCE: proposed stage contains guide-vane assembly, open impeller installed in guide-vanes assembly. Blades of impeller are arranged on lower surface of driving disk in which holes are made in spaces between points of blade fastening on disk. Distance from lower edge of each blade to upper surface of upper disk of guide-vane assembly is made increasing in direction from inner rim of blade lower edge to outer rim of said blade edge. EFFECT: reduced wear of friction pairs owing to effectively dividing gas bubbles and dirt inclusions, increased efficiency and head of stage. 6 cl, 2 dwg