Progressing cavity pump having less compressive fit near the dis

Details Progressing cavity pump having less compressive fit near the dis Progressing cavity pump having less compressive fit near the dis

1996-05-28

1998-03-03

Vrablik, John J.

Rotary expansible chamber devices

Unlike helical surfaces on relatively wobbling rotating...

418153, 418178, F04C 2107, F04C 500

Patent

active

057228205

ABSTRACT:
A progressing cavity pump is provided in which the compressive fit between the rotor and stator is gradually reduced with the distance from the suction end of the pump. This gradual decrease in compressive fit allows for increased slippage near the discharge end of the pump, resulting in better distribution of the internal differential pressure along the length of the pump. The differential pressure distribution in turn reduces heat build-up near the discharge end, increasing the life of the elastomeric stator or rotor.

REFERENCES:
patent: 3139035 (1964-06-01), O'Connor
patent: 3435772 (1969-04-01), Schlecht
patent: 3443482 (1969-05-01), Lummus et al.
patent: 4187061 (1980-02-01), Jurgens
patent: 4415316 (1983-11-01), Jurgens
patent: 5120204 (1992-06-01), Mathewson et al.
patent: 5358390 (1994-10-01), Jager

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