Screw pump including a fluid bypass regulating device

Details Screw pump including a fluid bypass regulating device Screw pump including a fluid bypass regulating device

1984-07-20

1986-04-08

Freeh, William L.

Pumps

Expansible chamber type

Having separate noncyclic valve

418 15, 418180, 418197, 418201, F04B 2300, F04C 200

Patent

active

045809534

ABSTRACT:
A screw pump of the kind including a screw array consisting of a central screw (1) with convex flanks and one or more side screws (2) with concave flanks, the threads being formed such that coacting screws seal against each other with the screw array being sealingly surrounded by a screw housing (3), so that at least one closed chamber is formed by the sides and roots of the threads as well as the screw housing, the chamber migrating axially from the inlet end of the screw array to its outlet end when the screws are turned, and is in communication at least during a portion of its migration with a pressure fluid source (9) via at least one duct (14) made in the pump. To prevent the occurrence of, and to eliminate, existing air and gas bubbles in the liquid chamber without efficiency being unnecessarily deteriorated, the pump is provided with a regulating device (15) coacting with the duct for adjusting the quantity of liquid flowing to the chamber from the pressure fluid source.

REFERENCES:
patent: 3103894 (1963-09-01), Sennet
patent: 3291061 (1966-12-01), Shinohara
patent: 3408114 (1968-10-01), Blackwell
patent: 3574488 (1971-04-01), Vanderstegen Drake
patent: 3809510 (1974-05-01), Gregerson et al.
patent: 3975123 (1976-08-01), Schibbye
patent: 4005949 (1977-02-01), Grant
patent: 4375156 (1983-03-01), Shaw

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