Air filters with reverse jet cleaning - using high pressure cleaning air expanded through nozzles at sonic velocities

摘要

A multiple element air filter has a reverse jet cleaning system in which the pulses of cleaning air are supplied at a pressure of at least 1.9ata and expanded through nozzles into the filter elements designed for an above-critical press. drop, with this reverse air flowing into the elements at supersonic velocity. It is used in filters with multiple candle elements, having supporting frames within each candle, the normal flow of dusty air being from outside the candle to the inside, and for operation at atmospheric pressure or under suction. The design allow a high reverse air flow to be used without energy loss and without turbulence, so that flows much greater than normal can be used and the filter vols. corresp. reduced.