Drive arrangement for progressing cavity pump

Details Drive arrangement for progressing cavity pump Drive arrangement for progressing cavity pump

1995-08-31

1996-08-27

Vrablik, John J.

Rotary expansible chamber devices

Unlike helical surfaces on relatively wobbling rotating...

418182, F04C 2107

Patent

active

055494641

ABSTRACT:
A progressing cavity pump having a rotor with a longitudinal bore and including at least one helix is mounted eccentrically within a stator having at least two helices. In a first embodiment the rotor is driven by an eccentric drive shaft which shares a journal surface with the rotor bore along the entire length of the rotor. In the second and third embodiments, the rotor is driven by a drive shaft concentric with the stator which drives a drive block having a bore that is eccentric relative to the stator. A rotor hub is rotatably mounted within the drive block bore. The drive shaft additionally drives a longitudinal auxiliary shaft within the longitudinal bore of the rotor. The auxiliary shaft is fixedly coupled to a second drive block which drives the rotor head. As external rotational actuation is applied to the drive shaft, the drive block rotates, acting as a crank on the rotor hub to drive the rotor. Simultaneously, the drive shaft actuates the longitudinal auxiliary shaft which drives the second drive block, the second drive block then acting as a crank on the head of the rotor. A fluid inlet and outlet are included with the stator, and as the rotor rotates and orbits within the stator, fluid contained in cavities between the rotor and stator helices is progressively pumped.

REFERENCES:
patent: 1892217 (1932-12-01), Moineau
patent: 4140444 (1979-02-01), Allen

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