Screw pump construction

Details Screw pump construction Screw pump construction

1978-11-24

1980-12-16

Smith, Leonard E.

Rotary kinetic fluid motors or pumps

Runner has spirally arranged blade or fluid passage

Extending along runner axis

416177, F04D 300

Patent

active

042394490

ABSTRACT:
A hydraulic screw pump is provided having a rotatable screw which may comprise a helical blade disposed within an enclosed full or open half cylinder. In half-cylindrical constructions the helical blade rotates relative to a half cylinder which may be formed of concrete. The enclosed screw pumps may have the helical blades welded to the inner periphery of a surrounding metal cylinder so as to rotate therewith, or be welded to said surrounding metal cylinder and also to an inner cylinder which provides axial reinforcement.
In all of the foregoing pump embodiments the improvement of this invention may be utilized to provide increased pump capacity by the novel expedient of flaring the pump discharge end so as to increase the critical depth and critical flow area in said discharge end thus increasing the possible maximum rate of liquid discharge.

REFERENCES:
patent: 81938 (1868-09-01), Patric
patent: 84237 (1868-11-01), Waite
patent: 1132775 (1915-03-01), Hille
patent: 1458850 (1923-06-01), Rath
patent: 3796508 (1974-03-01), Rowley
patent: 4019830 (1977-04-01), Reid
patent: 4170436 (1979-10-01), Candler

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