Self-cleaning filter

Details Self-cleaning filter Self-cleaning filter

1976-11-15

1977-08-02

Spear, Jr., Frank A.

Liquid purification or separation

Flow, fluid pressure or material level, responsive

Filter cleaning

210117, 210136, 210352, 210353, 210356, 210456, B01D 2938

Patent

active

040394522

ABSTRACT:
A self-cleaning filter includes a housing having a compressible filter element and a compression spring for applying spring pressure to the filter element. Unfiltered fluid, at line pressure, is forced upwardly through the filter element. Spring tension is overcome by line pressure during normal filtering operations to compress the spring and allow the filter element to maintain a relatively uncompressed condition during filtering. The spring tension is sufficient to automatically compress the filter element when line pressure is shut off to squeeze the filter element and flush out filtered particles from the filter element into a chamber below it. Separate agitators in the chamber rapidly spin and move in a random pattern throughout the chamber to keep the walls of the chamber clean from filtered particles during filtering operations. The chamber may have an automatic drain valve which automatically opens when line pressure is shut off to discharge filtered particles from the housing.

REFERENCES:
patent: 515769 (1894-03-01), Harris
patent: 1696313 (1928-12-01), Liddell
patent: 1705908 (1929-03-01), DeWitt
patent: 3445002 (1969-05-01), Muller
patent: 3617551 (1971-11-01), Johnston et al.
patent: 3747769 (1973-07-01), Brumfield

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