Progressive cavity pump/motor stator, and apparatus and...

Details Progressive cavity pump/motor stator, and apparatus and... Progressive cavity pump/motor stator, and apparatus and...

2007-03-20

2007-03-20

Nguyen, Hoang (Department: 3748)

Rotary expansible chamber devices

Unlike helical surfaces on relatively wobbling rotating...

C418S153000, C418S178000, C029S888023, C029S888061, C205S651000

Reexamination Certificate

active

10887189

ABSTRACT:
Electrochemical machining is used to generate the helical lobe profiles of the stator of a progressive cavity pump or motor. A thin, elastomeric liner, of uniform thickness is bonded either to the interior of the stator, or to the exterior of the rotor. Where the elastomeric liner is to be bonded to the interior of the stator, bonding is improved by electrically etching the interior of the stator during the electrochemical machining process to produce a roughened surface.

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