Patent ID: 7407372
Filing Date: 2008-08-05
Classification: F04C

Abstract:
1. A progressing cavity pump or motor, comprising: an outer sleeve-shaped tube; a stator material molded within the outer tube, an interior surface of the stator material having a non-cylindrical configuration; a rotor for rotating within the stator; an inner tube spaced radially between an outer surface of the stator and an inner surface of the stator, the inner tube having a substantially uniform diameter along its axial length and including a plurality of radially extending through apertures each filled with stator material; and one or more annular seal glands positioned between an outer surface of the inner tube and an inner surface of the outer tube for sealing the stator material to the outer tube, the seal gland positioned adjacent an end of the inner tube and including an axially extending lip extending from a seal gland base toward a center portion of the inner tube.