Variable breadth impeller that provides a specific shutoff head

Details Variable breadth impeller that provides a specific shutoff head Variable breadth impeller that provides a specific shutoff head

1992-04-20

1993-05-18

Look, Edward K.

Rotary kinetic fluid motors or pumps

With control means responsive to non-cyclic condition...

Temperature or fluid force responsive member

415131, 415156, 415157, 2988922, 298897, F04D 1500, F04D 2928

Patent

active

052115305

ABSTRACT:
In accordance with the present invention, an improved variable breadth imler for use in a variable capacity centrifugal pump and a method for adapting a variable capacity centrifugal pump to produce a specific predetermined shutoff head are provided. The variable breadth impeller is a two piece unit comprising an impeller element having a plurality of radially extending impeller vanes thereon and an axially movable shroud having a plurality of radially extending grooves therein for receiving the impeller vanes in a meshing relationship. The movable shroud further includes a plurality of axially extending grooves in its outer peripheral surface which act as a supplemental pumping means between minimum flow rate condition and shutoff condition. The operation of the improved variable breadth impeller results in a specific predetermined pressure head being attained and maintained at pump shutoff operating condition.

REFERENCES:
patent: 2927536 (1960-03-01), Rhoades
patent: 2957424 (1960-10-01), Brundage et al.
patent: 3482523 (1969-12-01), Morando
patent: 3746467 (1973-07-01), Buse
patent: 3918831 (1975-11-01), Grennan
patent: 4070132 (1978-01-01), Lynch
patent: 4417849 (1983-11-01), Morris
patent: 4828454 (1989-05-01), Morris et al.

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