US 4,147,635 AGranted

Filter apparatus

AssigneeJ. R. Schneider Co., Inc.

InventorWilliam D. Crowe

Life of this patent

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Abstract

A filter apparatus wherein filter media is submerged in liquid being filtered and suction is employed under the media to increase the flow through it. The filter media in elongated strip form is supported for movement in one direction on an inclined endless pervious conveyor comprised of rigid plate members fixed to a pair of drive chains. A receiving tank for dirty liquid is above the conveyor and media with a lower tank for clean liquid below the conveyor with the sides and ends of the lower tank being constantly sealed in order to maintain reduced pressure therein to enhance flow through the media. Filtered liquid at a somewhat higher pressure is supplied at the sides of the conveyor and at end walls of the receiving tank to prevent any migration of dirty liquid into the lower tank at the periphery of the lower tank. Advancement of the filter media is controlled automatically in response to variations in the pressure differential on opposite sides of the media which varies in proportional to the dirt load of the media.

Claims6

Dependent claims

A filter apparatus comprising:

a frame;
a continuous flexible and pervious conveyor belt comprised of relatively thin transverse plates fixed to a pair of continuous chains;
upper and lower spaced apart sprocket means on said frame for supporting said chains so that an inclined upper portion of said belt slopes upwardly;
side wall and end wall means forming a receiving tank for dirty liquid above said inclined upper portion of said belt and a collection tank for clean liquid below said inclined upper portion and under said receiving tank;
inclined belt support means fixed to said sidewall means;
means for feeding a layer of filter media onto said belt so that it can cover the upper surface of its said inclined upper portion;
sealing means around the periphery of said collection tank comprising elongated sealing members fixed to each said receiving tank side wall and spaced above said inclined belt support means to form side chambers for clean liquid and means for supplying clean liquid to said side chambers and to the lower end of said receiving tank at a pressure greater than the pressure of dirty liquid within said receiving tank, thereby preventing the migration of dirty liquid around the side edges of said belt into said collection tank;
suction means for reducing the pressure within and withdrawing clean liquid from said collection tank;
and
drive means connected to said upper sprocket means for moving said conveyor belt and thus the media thereon forwardly and upwardly along said incline.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 05/868,612Filed 11 Jan 1978 · continuation in part
Priority: 21 Mar 1977
Granted: 3 Apr 1979
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

B01D 29/096
With filtering bands, e.g. movable between filtering operations: construction of filtering bands or supporting belts, e.g. devices for centering,…
B01D 29/606
Integrally combined with devices for controlling the filtration: by pressure measuring
B01D 2201/34
Details relating to filtering apparatus: seals or gaskets for filtering elements
B01D
Separation