CENTRIFUGAL WELL PUMP STAGE Russian patent published in 2009 - IPC F04D13/10 F04D29/44 

FIELD: engines and pumps.

SUBSTANCE: invention relates to engines and pumps and can be used in well immersible pumps used in oil production. Proposed stage comprises impeller made up of drive and driven disks with vanes arranged there between, inlet and discharge guide cases. Proposed stage incorporates device to create pressure head at the impeller inlet. Aforesaid device represents multi-start screw with its hub furnished with collar rigidly jointed to discharge guide case and smoothly mating, on the suction side, the hub cylindrical section to form shaped space with the screw end face. Hub base cylindrical section features inclined thin-wall ribs with coiling direction opposite to impeller rotation, and helix angle equal to 40° to 45° and extending beyond the hub base.

EFFECT: higher efficiency.

3 dwg