Backwashable filter having elements with elastically deflectable

Details Backwashable filter having elements with elastically deflectable Backwashable filter having elements with elastically deflectable

1994-12-19

1997-05-13

Drodge, Joseph W.

Liquid purification or separation

Flow, fluid pressure or material level, responsive

Filter cleaning

210356, 210396, 210488, B01D 2923, B01D 2946, B01D 2952, B01D 2964

Patent

active

056288980

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The invention relates to a backwashable filter, material, takes place, accumulation point for contaminations by particles such as sand grains, etc. and members such as studs or lugs located on the elements
Backwashable filters have long been known. The elements normally comprise circular ring-shaped elements, which are superimposed as a layer for forming filter cartridges or candles. Filters of this type are e.g. used in steam condensers for filtering the cooling water or for conditioning the service water in the chemical and mechanical industries. The filter candles are generally placed on a filter plate, which has a number of holes corresponding to the number of filter candles. They form the access to the filter candles and consequently their filtering action occurs when there is a through-flow from the inside to the outside.
There are several possibilities available for the backwashing of filter candles. Firstly on the filter plate can rotate a suction shoe, which successively blocks access to each filter candle and with the aid of a suction pump places it under a vacuum or underpressure, whilst the filtering is continued in the remaining filter candles. In the filter candle subject to the suction pressure there is a reversal of the through-flow from the outside to the inside, so that the contaminants are rinsed away from the accumulation point and discharged from the candle. In place of a rotary suction shoe it is also possible to have a rotating filter plate, the suction shoe or shoes then being fixed. Diverging therefrom the filter plate can be subdivided on the inflow side into segments in the same number as the filter candles and each segment can be separately shut off and sucked off. There is then also a return flow of the filtered water from the outside to the inside through the filter candle and into the shut off segment and from there out of the filter housing, e.g. with the aid of a pipe.
German utility model 72 36 018 discloses a backwashable filter of the aforementioned type, in which the layerwise, superimposed elements form filter candles through which there is a flow from the inside to the outside. Each element comprises a ring or annular disk with inclined, movable tongues on the inside, which form pairwise, resilient, superimposed slits. The slits have on the inner edge of the tongues a relatively narrow opening cross-section and widen in the flow direction due to the inclined arrangement of the tongues. As a result of the elastic construction of the tongues they can be pressed apart during the backwashing process, so that the entrance cross-sections are correspondingly widened and contaminants jammed in the entrance area are freed during backwashing.
DE-OS 34 09 036 discloses a backwashable filter, in which the layer of superimposed elements in the form of filter candles is also formed from annular disks, through which there is a radial flow from the inside to the outside in filter operation. Two adjacent annular disks form a multiply subdivided annular clearance for the passage of the flow and which is constructed in such a way that the inner ends of in each case thinner annular disk portions are raised in the direction of a gap enlargement during the backwashing process from a thicker annular disk portion facing the gap spacing, so that any contaminants jammed in the annular clearance opening are freed during backwashing. The edge portion of the thinner annular disk consequently moves at right angles to the flow direction of the medium to be filtered or backwashed. This principle is also used in a block filter known from British patent 1 273 976. In place of the annular clearances there are rectangular gaps, whose one edge is formed by tongues, which can spring out transversely to the flow direction for gap enlargement purposes during backwashing.
European patent 159 961 discloses a backwashable filter, which has elastic spacers between the filter elements, as well as means able to vary the spacing between the filter elements by a corresponding change to

REFERENCES:
patent: 1646404 (1927-10-01), Herbert
patent: 1677892 (1928-07-01), Herbert et al.
patent: 3006478 (1961-10-01), Mueller
patent: 3568842 (1971-03-01), Bozek
patent: 3622003 (1971-11-01), Czech et al.
patent: 4402829 (1983-09-01), Cordua
patent: 4430232 (1984-02-01), Doucet
patent: 4707259 (1987-11-01), Doucet

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