Screw type pump

Details Screw type pump Screw type pump

1991-11-06

1993-04-20

Bertsch, Richard A.

Pumps

Expansible chamber type

Having separate noncyclic valve

417274, 417278, 417283, 4182012, F04B 4100

Patent

active

052036839

ABSTRACT:
A screw pump having a pair of screw rotors meshed with each other and rotatably supported in a housing having an intake port provided at one end and a piston movably provided at the other axial end of the housing, which piston defines a discharge port in cooperation with the housing. The movement of the piston in a direction substantially perpendicular to the axes of the screw rotors enables the distance between a discharge starting position of the discharge port and the intake port to be varied, so that the internal compression ratio can be varied. This arrangement ensures that the size of the housing will not be increased and any disadvantage due to the difference in thermal expansion along the length of the housing can be overcome.

REFERENCES:
patent: 3151806 (1964-10-01), Whitfield
patent: 4457681 (1984-07-01), Garland
patent: 4727725 (1988-03-01), Nagata et al.
patent: 5090392 (1992-02-01), Nakano et al.
Patent Abstract of Japan Application A-57 206 789 Mar. 1983.

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