Abstract: An air filtration apparatus for industrial applications is disclosed, which includes a front vertical wall which can be positioned to form one side of a work station. The interior of the housing is divided between an upper dirty air chamber which receives the contaminated air from the work station, and a lower clean air chamber. The dividing wall between the two chambers is in the form of a transverse panel which is inclined with respect to the horizontal, and a plurality of hollow pedestals extend upwardly from the transverse panel. Cartridge type filters are mounted upon the pedestals, with the open ends of the filters facing downwardly and being pressed against the pedestals by hand operated clamps so as to form a seal therebetween. A reverse pulse air cleaning system is also provided, which periodically injects a pulse of air upwardly into the lower open end of each of the filters, so as to periodically clean the collected particulates from the outer surfaces of the filters.

Abstract: A dust collecting apparatus wherein a plurality of elongate filter elements are periodically cleaned by a reverse pulse cleaning system which directs a reverse pulse of air through the open end of each filter element so as to remove contaminants which have collected on its external surface. The reverse pulse cleaning system has an air delivery pipe above each of the filter elements, and each air delivery pipe includes an air delivery nozzle assembly which includes at least one pair of transverse pipe sections which are transversely aligned and extend in opposite directions from the air delivery pipe, to define a cross-like configuration in plan view. A plurality of apertures are disposed in a linear line along the air delivery pipe, and at least one aperture is disposed in each of the transverse pipe sections.

Abstract: A method of retrofitting a dust collecting apparatus is disclosed which has a plurality of filter bags arranged in a number of rows, and which also has a reverse pulse cleaning system. In accordance with the present invention, selected bags are rendered inactive, and the active and inactive bags are arranged in a predetermined pattern so that the active bags are shielded by the inactive bags from the particulate matter expelled from the active bags of adjacent rows during the reverse pulse cleaning operation. This shielding permits a greater volume of air to be pulsed into the active bags during cleaning, which greatly increases the degree to which the active bags are cleaned.

Abstract: This invention relates to self cleaning dust collectors having top mounted filter cartridges. The top mounted filter cartridges include a top mounting plate having an annular flange and an outer peripheral lip to support and carry a sealing gasket. The outer peripheral lip provides lateral support for the gasket under the pressures involved during the operation of the dust collector, and it also serves to prevent over compression of the gasket. The dust collector is further provided with a reverse pulse air cleaning system which includes an air delivery pipe located above the filter cartridges, and with the air delivery pipe being spaced from the dividing wall a sufficient distance to allow for upward removal and easy replacement of the filter cartridges without extensive assembly and disassembly of the dust collector.

Abstract: The invention provides a filter apparatus for use in air pollution control which includes at least one hollow filter assembly disposed in a hopper and having an open upper end registering with a wall opening. Contaminated air is introduced into the hopper through an inlet and is caused to flow into an exhaust chamber through the filter and the opening. The filter apparatus includes an end plate supporting the filter assembly and sealing the lower end of the filter assembly. The filter apparatus also includes a nozzle spaced above the filter assembly for selectively directing a reverse pulse of air into the open upper end of the filter such that the reverse air pulse enters the filter assembly and flows through the filter medium in the reverse of the direction of contaminated airflow to thereby remove accumulated contaminants from the filter medium.

Abstract: A dust collector comprising a hopper, an exhaust chamber, a wall separating the hopper and the exhaust chamber and including an opening, a hollow filter assembly for filtering contaminated air flowing through the opening from the hopper, the filter assembly comprising filter medium and having upper and lower ends, the upper end of the filter assembly registering with the wall opening such that the hopper is generally sealed from the exhaust chamber except through the wall opening and the filter medium of the filter assembly, an inlet into the hopper for introducing contaminated air into the hopper so that the contaminated air is caused to flow to the exhaust chamber through the filter medium whereby airborne contaminants are accumulated on the filter medium, a nozzle for selectively directing reverse pulses of air into the wall opening from the exhaust chamber whereby the reverse air pulses enter the filter assembly and generate airflow through the filter medium in the reverse of the direction of contaminated

Abstract: Air shaping mouth inserts for bag type air filters formed as planar sided tubes of rectangular and triangular cross section are inserted into the open ends of the bags. Their mouths are sealed to the bag rim so that air flow is restricted to the interior of the tube insert. This type of insert facilitates shaping and distribution of the reverse jet cleaning pulse by rotating the tubes around the axis or by altering the straight sides to unbalance the cross section of the air flow path.

Abstract: A moving manifold for back flushing open-mouthed filter bags so that the dust accumulated on the bags exterior is dislodged. The manifold distributes both continuously blower driven air and high pressure air from pulsed jets for back-flushing the bags. A back draft damper installed in the manifold is opened by the decreased pressure created when the high pressure air is activated in order to reduce structural stresses on the manifold and reduce the power required for the blower drive.

Abstract: The invention provides a dust collector for use in air pollution control which includes at least one hollow filter assembly disposed in a hopper and having an open upper end registering with a wall opening. The filter apparatus also includes a nozzle spaced above the filter assembly for selectively directing a reverse pulse of air into the open upper end of the filter such that the reverse air pulse enters the filter assembly and flows through the filter medium in the reverse of the direction of contaminated airflow to thereby remove accumulated contaminants from the filter medium. The dust collector further includes a sleeve positioned inside the hollow filter assembly with the outer surface of the sleeve adjacent the filter medium, the upper end of the sleeve registering with the wall opening and the lower end of the sleeve opening into the filter assembly.