System, method and apparatus for open impeller and diffuser...

Details System, method and apparatus for open impeller and diffuser... System, method and apparatus for open impeller and diffuser...

2008-05-19

2011-12-06

Edgar, Richard (Department: 3745)

Rotary kinetic fluid motors or pumps

Bearing, seal, or liner between runner portion and static part

Resilient, flexible, or resiliently biased

C415S199200, C415S901000

Reexamination Certificate

active

08070426

ABSTRACT:
A multi-stage submersible pump uses impellers having only one shroud to provide stages with shorter stack lengths to allow more stages per housing and more head pressure per housing. The impellers are biased with wave springs to keep the rotating impeller vanes close to the mating diffusers. The entire stack of impellers is assembled in contact with each other using the wave springs and are always under axial load. The wave springs also take up any tolerance variations in the stack to keep the impellers in proper running position. To keep the impellers in their proper locations, thrust washers formed from hard materials are used between adjacent impellers to avoid erosion thereof.

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