Rotary, self-priming, liquip pump, and an impellers and shaft as

Details Rotary, self-priming, liquip pump, and an impellers and shaft as Rotary, self-priming, liquip pump, and an impellers and shaft as

1995-05-15

1997-02-04

Freay, Charles G.

Pumps

Diverse pumps

Priming and venting

417203, 415143, F04B 2308

Patent

active

055991718

ABSTRACT:
A pump housing has a plurality of chambers formed therein, and a shaft journaled within, the shaft having impellers keyed thereto. Each chamber has one of the impellers disposed therein. One of the impellers is the primary liquid-working element, and has rigid vanes. The vanes are generously spaced apart from the enclosing chamber walls. A second impeller has flexible vanes, and serves as a priming element; it has an intimate fit in its chamber and cooperates with an outlet flapper valve to create a negative pressure in the liquid inlet. Consequently, the pump can self-prime even when absolutely dry.

REFERENCES:
patent: 2899902 (1959-08-01), Bandli et al.
patent: 3082694 (1963-03-01), Brkich
patent: 3518028 (1970-06-01), Minick
patent: 4256436 (1981-03-01), Fandrey et al.
patent: 4392779 (1983-07-01), Bloemers et al.
patent: 4624627 (1986-11-01), Tunks

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