Moineau pump with rotating outer member

USRE29180E · kind E · reissue

Inventor

• Wallace Clark · Indianapolis, US

Key dates

• Filing date: Apr 2, 1976
• Grant date: Apr 12, 1977
• Expiry date: Apr 2, 1996

Classification

• Technology area (CPC —): General

Abstract

A pump composed of a gear pair made up of an inner member having at least one external helical thread, and an outer member having internal helical threads, there being one more internal helical thread in the outer member than the number of threads on the inner member. The inner member is free to gyrate but prevented from rotation, and the outer member rotates on its true axis. The outer member is fixed in a tubular casing having at least one aperture for fluid being pumped, and this member extends beyond the gear pair and constitutes a drive shaft for the pump. The tubular casing is disposed in a housing and is arranged for rotation in the housing on suitable bearings and suitable seals. The housing has a port at each end of said gear pair, so that the direction of pumping may be reversed by reversing the direction of rotation of said drive shaft.