Eccentric screw pump

Details Eccentric screw pump Eccentric screw pump

1993-10-15

1994-10-25

Bertsch, Richard A.

Rotary expansible chamber devices

Unlike helical surfaces on relatively wobbling rotating...

F01C 110

Patent

active

053583906

ABSTRACT:
An eccentric screw pump having a rigid rotor, which is embodied as a spiral and has a circular cross-sectional configuration, and also having a stator that is provided with an elastic lining that delimits a cavity which accommodates the rotor and has the form of a spiral with a cross-sectional configuration that essentially has the shape of a rectangle bounded on opposite sides by a respective semicircle. The sides of the essentially rectangular portion that interconnect the semicircles, proceeding essentially from the semicircles, are provided with projections that bulge convexly in a direction toward an interior of the cavity of the stator. In the vicinity of the inlet end of the stator, the projections bulge inwardly to a lesser extent than at the pressure side of the stator.

REFERENCES:
patent: 4104009 (1978-08-01), Chanton
patent: 4773834 (1988-09-01), Saruwatari

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