Progressive cavity pump or motors

摘要

A stator assembly for a progressive pump or motor, comprising a resilient material stator (10) having a helical bore (12) therethrough, the cylindrical outer surface (14) of the stator having a plurality of axially extending circumferentially spaced outward projections (16). A rigid generally tubular member (22) has cooperating recesses (24) and may be formed of a unitary tube or of a plurality of shell elements with a cooperating clamp arrangement (32-36). The side faces (18,20) of the projections are flat and either parallel to one another or are inclined towards one another in the radially outward direction.