Method and device for unclogging filter cloths
AssigneeEuropean Atomic Energy Community (Euratom)
InventorsJean Lauzeral, Christian Laville
Life of this patent
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Abstract
A method and device for unclogging filter cloths for use in filter apparatus particularly apparatus of the kind wherein the cloth describes a closed loop between a filtering station and an unclogging station. Gas is ejected from one or more nozzles through the cloth which is vibrated at a sonic and/or ultrasonic frequency at a location opposite the nozzle ejection head. The cloth is simultaneously stretched at the same location into a projecting shape having leading and trailing edges with a length, in the direction of motion of the cloth, of not more than three times their height in the direction perpendicular to the direction of motion of the cloth.
Claims8
Apparatus for cleaning a filter cloth, comprising:
- a nozzle having a head with a slot for ejecting a jet of cleaning gas, a part of which passes through the cloth;
- means for moving the cloth across said head;
- means for locating said nozzle at a minimal distance from the cloth, said locating means being responsive to a reaction of a jet of gas against the cloth, wherein said head has an internal profile such that gas is ejected from said slot at a speed which is within 20% of the speed of sound in air and in which the slot opens substantially perpendicular to the direction of movement of the cloth across said head, and wherein said means for locating includes, on the exterior of said head at opposite sides of said slot, outer lips of semi-cylindrical profile, said lips forming with the cloth when the cloth is moved across said head a bifurcated restricted path having branches about said lips for the part of the gas which does not pass through the cloth.
Dependencies are inferred from the claim text.