Rotary expansible chamber devices – Unlike helical surfaces on relatively wobbling rotating...
Patent
1987-03-10
1988-09-27
Vrablik, John J.
Rotary expansible chamber devices
Unlike helical surfaces on relatively wobbling rotating...
418153, F04C 2107, F04C 500
Patent
active
047738340
ABSTRACT:
A progressive cavity pump of the type having a stator member and a rotor member disposed within a cavity in the stator member and being rotated while being permitted to orbit about a central axis of the stator in operation, one of the members being formed of resilient material and the other of rigid material. The rotor is of helical formation having a constant circular transverse cross-section and defining a single-start thread of a preselected pitch and direction, and the cavity of the stator is in the form of a two start thread of the same direction as the rotor and twice the pitch, the cavity in transverse cross-section has an outline defined by a pair of spaced semi-circular concave ends and a pair of sides joining the semi-circular ends. The semi-circular ends have a diameter slightly less than the diameter of the cross-section of the rotor for establishing an interference fit between the rigid and resilient members. The pair of sides have an inward curvature so that the distance between the pair of sides is slightly less than the diameter of the circular ends whereby sealing areas of increased interference are provided between the members. Unlike known progressive cavity pumps, a high pressure output is possible without making the pump inefficient or of a prohibitive length.
REFERENCES:
patent: 2527673 (1950-10-01), Byram
patent: 3380391 (1968-04-01), John
patent: 4104009 (1978-08-01), Chanton
The Mono Pump, The Modern Pumping Principle-Mono Pumps (Australia) Pty. Ltd.
The Progressing Cavity Down Hole Pump-Tarby Engineering Company.
Becker Pumps, Eliminate Rod Fall Problems and Pump Up To 40% Sand-Conrod Manufacturing Ltd.
Moyno Progressing Cavity Pumps, Bulletin 110A-Robbins Myers, c. 1979.
Operation-Assembly Instructions and Parts List for "L4" Drive End-Robbins Myers.
Ramoy Pumps-Robbins Myers, Apr. 1980.
Continental Progressing Cavity Pumps, Catalog CL-8000-Continental Pump Co., c. 1981.
Quinn Patrick J.
Vrablik John J.
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