Backwashable filter for fluids

Details Backwashable filter for fluids Backwashable filter for fluids

1995-01-11

1996-09-10

Nessler, Cynthia L.

Liquid purification or separation

Filter

Medium, cleaner or agitator moved by fluid

210392, 210393, 210396, 210402, 210411, B01D 33073, B01D 3346, B01D 3350

Patent

active

055542840

ABSTRACT:
A backwashable fluid filter formed with a filter element which is disposed so that it can be rotated about its axis inside the filter housing by a drive mechanism and through which a radial flow passes. A backwashing device is provided which includes a dirt removal channel which extends parallel to the axis of the filter element. When the filter element is backwashed, clean fluid flows back through the filter element, removes dirt particles adhering to the filter element and carries them into the dirt removal channel. In order to pre-clean the filter element, a resiliently mounted stripping device is arranged in front of the backwashing device to remove coarse dirt from the surface of the filter element before it reaches the backwashing device. The filter element is provided with slit-like openings, each of which has a substantially U-shaped configuration and defines a resilient tongue. During backwashing, these resilient tongues have the advantage that they can move out of their normal positions to expand the width of the slit-like openings and facilitate effective cleaning of filter element.

REFERENCES:
patent: 1512977 (1924-10-01), Depue
patent: 1914742 (1933-06-01), Hillier
patent: 2167322 (1939-07-01), Cuno et al.
patent: 2242861 (1941-05-01), Keene
patent: 2332917 (1943-10-01), Jordan et al.
patent: 3333700 (1967-08-01), Coleman
patent: 3363771 (1968-01-01), Walters
patent: 4818402 (1989-04-01), Steiner et al.
patent: 5051195 (1991-09-01), Haapamaki et al.
patent: 5183568 (1993-02-01), Lescovich
patent: 5423977 (1995-06-01), Aoki et al.

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