Screw pump

Details Screw pump Screw pump

1986-06-23

1988-09-27

Freeh, William L.

Rotary expansible chamber devices

Apertured bypass to pressurize or relieve working chamber...

418197, F04C 216, F04C 1816

Patent

active

047738375

ABSTRACT:
A screw pump including a screw assembly in a sleeve, the assembly comprising a drive screw having protruding threaded sides, and multiple driven screws having concave threaded sides which are closely meshed with the drive screw, thus forming a series of sealed chamber. The screw pump further includes one or more channels which are formed in the circumferential direction around the periphery of the driven screws, so that the final sealed chamber adjacent a discharge port of the pump partially communicates with the port through the channels shortly before the chamber completely opens to the port.

REFERENCES:
patent: 2289371 (1942-07-01), Lysholm
patent: 2601003 (1952-06-01), Pontius
patent: 2620968 (1952-12-01), Nilsson
patent: 2845031 (1958-07-01), Guibert
patent: 2924181 (1960-02-01), Sennet
patent: 3103894 (1963-09-01), Sennet

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