Patent ID: 9309767
Filing Date: 2016-04-12
CPC Classification: B33Y,F01C,F04C,Y10T

Claim Text:
1. A stator for a progressive cavity pump or motor, comprising: a tubular housing having a central axis; a stator insert coaxially disposed within the housing, wherein the stator insert has a radially outer surface that engages the housing and a radially inner surface defining a helical-shaped through bore extending axially through the stator insert; wherein the stator insert includes an insert body and an insert liner attached to the insert body, wherein the insert body is radially positioned between the housing and the insert liner; wherein the insert body comprises a monolithic reinforcement structure and a plurality of voids dispersed within the reinforcement structure; wherein the reinforcement structure comprises a plurality of negative draft recesses extending radially outward from a radially inner surface of the reinforcement structure, and wherein each negative draft recess has a circumferential width that increases moving radially outward from the radially inner surface of the reinforcement structure; wherein the insert liner extends radially into each of the plurality of negative draft recesses on the radially inner surface of the reinforcement structure.