Abstract: Contaminated air is drawn from a relatively enclosed dirty air space and filtered to remove both contaminants and other particulate materials. A main mechanical filter is positioned between the dirty air space and a surrounding environment which is to be protected from contamination. An exhaust fan is positioned on the output side of the main filter, to create a partial vacuum within the dirty air space. An irradiation device is positioned on the output side of the main filter. A secondary vacuum system is utilized to create a secondary vacuum that is substantially stronger than the partial vacuum applied to the main filter, and the secondary vacuum is applied to successive selected portions of the air input side of the main filter for creating a reverse air flow to clean contaminants and other particulate materials which are being continuously deposited there.

Abstract: Apparatus for filtering or collecting dust or other particulate matter which includes a plurality of filter elements that must be cleaned at periodic intervals by emitting a burst of cleaning air into the interior of the filter element so that it flows in a reverse direction to the normal flow of the transport air to remove particulate matter accumulated on the surface of the filter element. The cleaning air is emitted from a plurality of nozzles mounted on a horizontal arm that rotates above the filter elements, and each nozzle is provided with its own valve which can be opened to connect the nozzle to a source of pressurized cleaning air. A microprocessor is programmed to receive a reference signal when the horizontal arm reaches a predetermined point in its movement, after which the microprocessor is programmed to operate each of the valves in a predetermined sequence and at a predetermined timed frequency.

Abstract: A filter arrangement includes at least one drum-type filter. A suction device is provided for suctioning of the inside of the drum-type filter along a helical line. The suction device includes at least one suction hose and a suction nozzle provided at the free end of the suction hose. The suction nozzle is constructed for contacting the inner side of the drum-type filter. The suction hose is attached to an end portion of a rotatable suction pipe. The end portion is constructed so as to be movable back and forth in longitudinal direction of the drum-type filter, so that movement in longitudinal direction and rotary movement of the end portion of the suction pipe results in a suctioning-off of the cylindrical inner side of the drum-type filter along a helical line.

Abstract: A device for the removal of dust from parts protecting weaving machine components from weaving dust includes a dust screen, a number of freely movable blowing tubes which direct air from their open ends into an area adjacent the dust screen, and blowing devices for feeding air through the tubes. Removed dust is disposed of by a separate device such as a suction nozzle.

Abstract: An intermittent drive (10) for intermittently advancing a cleaning head (50) for sequential cleaning of filter bags (44) in a bag house (12). The intermittent drive includes a ratchet wheel (80) secured to a central shaft (74) on which the cleaning head is radially mounted. A drive plate (90) in proximity to the ratchet wheel is continuously rotated by a drive motor (83) about a drive axis (88). An elongated drive arm (94) has a base end portion (100) pinned to the upper surface (92) of the drive plate at a point radially offset from the drive axis. The drive arm (94) also has a distal end portion (102) that is engageable with the teeth (82) of the ratchet wheel. The bottom surface (98) of the drive arm frictionally contacts the upper surface of drive plate to urge the drive arm into engagement with the ratchet wheel teeth.

Abstract: The travelling cleaner for looms and such machines with rows of moving machine members comprises a compressed-air blower guided to and fro along the row of moving machine members, the compressed-air blower is disposed on a compressed-air linear motor which is movable to and fro along a guide attached to the loom supporting the row of moving loom members, and the compressed-air blower and the compressed-air linear motor are connected to a mutual compressed-air source. This renders possible for the first time, a fully-automatic, optimal cleaning of rows of moving loom or machine members on any desired loom or machine of this kind.

Abstract: Prior art trap regeneration devices employ one or two relatively large ceramic trap cores, and a regeneration cycle that burns off the soot in a direction that subjects the porous walls to excessive temperature spikes. Moreover, during regeneration it is normal to bypass dirty exhaust gas directly to the atmosphere. In a first embodiment the subject trap regeneration apparatus includes an electrical heating element and a reverse flow device for each of a plurality of relatively smaller trap cores arranged in a housing, with each reverse flow device constructed for directing a source of air at a controlled rate toward the normal second end of the trap core, heating the air, forcing the heated air through the trap core to the first end, and to controllably burn out particulate matter while the remaining trap cores are functioning to filter the exhaust gases in the normal flow direction.

Abstract: A weaving loom cleaning apparatus comprising a duct extended across the loom and having upper and lower air-permeable walls at least one fan disposed within the duct to produce an air current flowing from the upper wall toward the lower wall of the duct, a fly collecting endless filtering belt disposed such that at least a part thereof runs along the upper surface of the duct, and a fly removing device disposed contiguously with the endless filtering belt, for removing flies collected on the endless filtering belt, and a central loom cleaning system for use in combination with a plurality of groups each composed of a plurality of looms each provided with the weaving loom cleaning apparatus.

Abstract: A flow of gas entraining particulate material is passed through a filter having an upstream side and a downstream side, with the particulate material remaining on the upstream side while the gas flows to the downstream side. The downstream side exhausts through an opening into a plenum chamber wherein a second valve is provided for intermittently providing a cleaning gas flow in the reverse direction through the filter to remove particulate material from the upstream side. Cleaning gas under pressure is provided to the second valve, opening of the second valve permitting cleaning gas to flow therefrom. A first valve controls gas flow through the opening, the first valve operating in synchronism with the second valve substantially to stop flow through the filter from the upstream side to the downstream side when the second valve provides the cleaning gas flow. The first valve includes a cylindrical throat having a first end and a second end.

Abstract: The invention relates to a filtering and collecting device of solid and powder refuse for industrial and civil suction apparatus equipped with at least one flexible, removable storage bag (17) and means (4) of drawing in and conveying refuse to the storage bag (17) adapted to form a flow of air and refuse, the device comprising: an air and refuse sorting zone (16a) supplied with the flow of air and refuse, at least one filter (19) communicated with the sorting zone (16a) and adapted to allow for the escape of air from the flow, and the storage bag (17) communicated with the sorting zone (16a) and made of an impervious material of the disposable type, to be thrown away together with refuse collected therein.

Abstract: An improved device is provided for cleaning particles from the plates of a two-stage electrostatic precipitator using a small stream of high velocity air which is moved over the face of the collecting cell. The cleaning device can operate without disturbing the normal operation of the precipitator. The improved cleaning device using a vacuum stream of air is particularly useful in a two-stage gas-cleaning electrostatic precipitator having a close-spaced collecting stage wherein the high voltage low voltage plates are spaced very close together, typically about 0.0625 inches apart.

Abstract: In the cleaning of (fluff) screens (17) of an apparatus for smoothing articles of clothing by means of flowing media, the fluff (fluff carpet 19) is sucked off from the fluff screen (17) by means of a suction nozzle (21). To improve the suction effect, blowing air (compressed air) is additionally conveyed through the fluff screen (17) from below in the region of suction via blowing pipes (25, 26). The suction nozzle (21) and the blowing pipes (25, 26) are connected to one another to form the jointly movable cleaning unit (20). This is moved over the fluff screen (17) at intervals of time.

Abstract: A booth for applying a powdered coating to the surfaces of workpieces in which a clean gas zone is joined to the coating zone via the rear wall, which is connected to an extractor fan. Located in a recess of the rear wall is a frame-like structure, the outer frame of which is split up into individual areas by means of frame cross-members each area receiving a filter element, which is housed in an interchangeable cassette, and consisting of a continuous zig-zag shaped or wave-shaped surface-membrane filter strip. Each area of the frame is covered in a leak-proof manner by a protective hood in hood space in an oblique manner towards the coating zone and detach the excess powder attached to the membrane applied thereon, which is diverted through a slat-type screen down to the floor of the booth and into a powder container. Thorough cleaning can be effected by a second cleaning device arranged in the coating zone or after removal of an interchangeable cassette from the booth.

Abstract: An apparatus for filtering air containing textile impurities, comprises an air-permeable, fixed collecting device preferably of accordion shape, for separating the textile impurities. The collecting device has a number of filtering portions which can be cleaned by at least one suction device.

Abstract: An electrostatic powder coating installation which includes a cabinet for accommodating a device for producing electrostatically charged powder, with a filter strip being disposed in the cabinet at a bottom end thereof. A suction system is provided which includes at least one movable suction nozzle and one suction air duct functionally connected with the suction nozzle with a suction blower. The suction nozzle is functionally connected with a drive belt, with the belt moving the nozzle transversely to the suction air duct. The suction nozzle is reciprocated by at least one motor driven belt, with the belt simultaneously serving as a sealing element for a slot provided along a length of the suction air duct.

Abstract: A reverse air dust collector having a housing and a partition plate dividing the housing into a clean air chamber and a dirty air chamber, with filter elements depending from the partition plate into the dirty air chamber so that air with entrained particles can pass through the filter elements and into the clean air chamber through openings in the partition plate. A centrifugal blower for generating a flow of cleaning air is fixed to a plenum chamber as an integral unit, and this unit is fixed to a stanchion member mounted for rotation about a vertical axis in the clean air chamber, with the plenum chamber and the blower being arranged on opposite sides of the axis of rotation. A drive arrangement is provided for the stanchion member which permits the driving gear to be pivotally displaced away from the driven gear fixed to the stanchion member in the event rotation of the stanchion member is prevented.

Abstract: A system for cleaning corrugated filter elements by means of suction nozzles comprises a suction nozzle movable relative to the surface of the element. The specific parameters of the system, such as nozzle size, spacing of the nozzle from the apices of the filter, and the height of the apices, are interrelated in accordance with a specially developed formula.

Abstract: A fluid filtering system which includes a fluid filtering unit having a localized cleaning arrangement. The fluid filtering unit comprises a filter element through which the fluid being filtered is passed and structure for cleaning the filter element without interruption of the filtering operation of the unit. The cleaning structure includes a cleaning head which ejects fluid under pressure and which is moveable relative to the filter element to bring about localized cleaning of the element. Preferably, the filter element is moved, by an hydraulic arrangement to bring about localized cleaning over the whole of the filter element.

Abstract: A gas filter is disclosed including a clean gas section and a dusty gas section separated by a porting plate which includes concentric rings of ports providing gas communication between the two sections. The ports have connected thereto respective filter media sleeves for collecting contamination held in suspension in the gas being filtered. In order to clean the filter sleeves there is provided a back flushing gas pulse generator which is connected directly to a housing body of the filter apparatus. The gas pulse generator includes a release valve in direct communication with a hollow rotatable shaft which leads to a gas pulse distributor having arms which sweep across the clean gas section side of the porting plate. The arms of the gas pulse distributor includes apertures aligned with the respective ports of the porting plate so as to inject into the filter media sleeves a pulse of clean gas in a reversed direction so as to shake out any contaminants that have been collected in the sleeves.

Abstract: A generally rectangularly shaped powder coating booth of a powder spraying apparatus is fomed of two main sections, each of which is constituted of wall and roof elements which are swingably interconnected to one another. The walls and roof of each half of the booth may be straightened out to form a flat, continuous and rectangularly shaped surface from which residues of powder may be removed easily and rapidly. Thus when the two halves of the booth are flattened out the booth is transformed into two parallel and spaced surfaces which can be cleaned by being vacuumed by a respective suction nozzle that is disposed to travel over and vacuum the surfaces automatically.

Abstract: An apparatus for cleaning air filters by a combination of vibration, air pressure, and suction. A support member includes a first inclined wall sloped more steeply than a second inclined wall, providing generally V-shaped supporting surfaces which cause the filter being cleaned to rotate as it is vibrated. The vibration of the filter also loosens trapped impurities therefrom, and this vibration is enhanced by resiliently suspending the support member from a housing. The loosened impurities fall down the slopes of the inclined walls and are removed by suction provided in a channel extending lengthwise along the bottom of the support member. An exhaust blower is connected to a port in the suction channel to apply suction to the filler and to remove loosened impurities. The exhaust blower is also connected to an inner suction tube, which applies suction to an inner periphery of the air filter.

Abstract: An electrostatic dry powder coating spraying system has a multi-color powder coating recovery system comprising a plurality of vertically extending cyclonic filter barrels laterally spaced about a central vertical axis and having vertically aligned upper ends. A single filter cleaning apparatus, including a filter backflushing system, is adapted to rest upon and operatively engage any selected one of such upper barrel ends, and is operative to backflush the filter within the barrel upon which it rests. Oversprayed powder from the spraying system is reclaimed by drawing it through the "active" filter barrel to which the filter cleaning apparatus is connected.

Abstract: A separator for separating fibers from fines in a flow of gas includes an enclosed housing which includes a cylindrical upper section and a lower section. A screen basket is fixedly mounted in the housing, and this basket defines a screened cylindrical wall, a closed bottom, and an open top. The screen basket is positioned in the housing to define an annular chamber between the upper section of the housing and the screened cylindrical wall of the basket. A first duct is mounted to pass a first flow of gas, fibers and fines into an upper portion of the annular chamber, and is oriented tangentially to cause the first flow to swirl around the screened cylindrical wall. A second duct is mounted to remove gas and fines which have passed through the screened cylindrical wall, and a third duct is mounted to remove gas and fibers which have passed to the lower section of the housing from the lower section.

Abstract: There is provided a method for cleaning corrugated filter elements by means of suction nozzles. The method comprises a corrugated filter element and at least one suction nozzle movable relative to the surface of the element. The specific parameters of the method are interrelated in accordance with a specially developed given formula.

Abstract: A method and apparatus for simultaneously washing a plurality of generally tubular or sock-like filtering elements of a gas filtering apparatus without removing the elements from the apparatus, the filter elements being disposed in a regular array of rows and columns within a housing between an inlet and an outlet thereof. The method includes positioning in the housing a liquid conduit having a plurality of axially spaced spray nozzles for delivering washing liquid along one or more rows of elements and supplying washing liquid to the conduit.

Abstract: A self-cleaning apparatus comprising a rotary drum filter which collects foreign matter on one surface of the filter media thereof, and a cleaning apparatus that includes an endless belt having openings formed therein and arranged for axial movement along the surface of the filter media, the belt being mounted for such movement on a plenum chamber having an extending slot which communicates with the openings in the belt during such movement thereof whereby a vacuum imposed within the plenum chamber will act to remove foreign matter from the filter media surface. The belt includes retaining means which permit a variety of nozzle elements or imperforate plates to be mounted on the belt at its openings.

Abstract: An air actuated lint removing system for cleaning lint filters in clothes dryers includes means for moving the lint filter and an air flow directing means with respect to one another to remove accumulated lint, and lint transporting means to move the lint to a lint collection reservoir.

Abstract: A vessel (10) is formed with a convexity of the shape of a dish (24). An immersion tube (40) protrudes into the vessel (10) and terminates inside the dish (24), being adapted for connection to a source of gas which will flow through the immersion tube in the direction of the dish by which it will be deflected so as to fluidize pulverous or granular material (30) contained in the vessel (10). A filter casing (50) is placed on top of the vessel (10) and it contains a filter (56) to hold back particles of material being treated which left the vessel. A rotating vane (60) is associated with the filter (56) and driven by a turbine (70) arranged in the immersion tube (40) so that the rotating vane will sweep across the filter (56). A slot nozzle (74) is formed at the rotating vane (60) and sucks off material from the filter (56) so as to keep it clean. The particles of material sucked off pass through a hollow shaft (62) into the immersion tube (40) and then back once more into the vessel (10).

Abstract: Apparatus for cleaning a high efficiency particulate air (HEPA) filter includes a vacuum system having a vacuum nozzle which spans the inlet face of the filter and a nozzle inlet lying closely adjacent the filter face. The nozzle inlet is dimensioned to effectively cover one or more two-cell filter modules formed by the filter media separators. A vacuum or induced draft is applied to the nozzle to provide a cleaning air flow counter to the flow of particulate air through the filter. The nozzle temporarily blocks or retards the flow of particulate air through the module or modules being cleaned while the flow and filtering of particulate air continues through the remaining major portion of the filter. Means and their corresponding method of operation for maintaining the nozzle in contact with the filter inlet face and for moving the same across the filter face for sequential cleaning of the filter modules are also disclosed.

Abstract: A cleaning system for dislodging dust from the filter bags of a dust filter having dirty and clean air plenums separated by a tube sheet. The tube sheet is divided into segments each having filter bag openings arranged in the same pattern. An air accumulator tank which continuously receives compressed air is rotated in the clean air plenum with a connected distribution arm which applies air pulses to the filter bags through discharge nozzles arranged in the same pattern as the filter bag openings. A position sensor allows cleaning air in the tank to be applied to the distribution arm only when the arm is aligned above a segment with all nozzles centered on the filter bags. A quick acting diaphragm valve is combined with the air tank to control air flow into the distribution arm at a location adjacent to the arm to minimize the response time.

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 present invention is directed to dust filtering apparatus comprising a cylindrical housing separated by a horizontal partition into dirty and clean air chambers with a plurality of radially spaced bags attached to the partition hanging in the dirty air chamber; positioned in the clean air chamber is a rotating cleaning arm supplied by a source of high pressure air including a nozzle means positioned to direct a high velocity jet of air into the bag openings in the partition through a venturi means attached to the rotating arm in spaced alignment from the nozzle means whereby the high velocity jet passing through the venturi entrains additional air momentarily into the individual bag being back-washed, and a closure plate on the arm concentrically aligned with the venturi and nozzle to momentarily retain the entrained air within the bag opening.

Abstract: A self-cleansing air cleaner comprising an air blast nozzle which is driven at constant speed through a path including at least two filter sections includes means responsive to each air blast to temporarily halt the nozzle during at least part of the duration of the blast, and to thereafter re-synchronize the nozzle movement with that of the constant speed drive.

Abstract: A classifier for separating into particulate matter relatively coarse and fine particles. The classifier includes a casing, at least one cylindrical screen assembly mounted in the casing and extending substantially in the direction in which the particulate matter flows in the casing for forcing the fine particles to traverse the cylindrical screen assembly, and at least one air purge pipe disposed in the casing for blowing air against the screen assembly to remove particles off the screen assembly, the cylindrical screen assembly and the air purge pipe being relatively movable by a drive mechanism. The cylindrical screen assembly has an increased degree of mechanical strength and rigidity, and provides a wide effective area available for screening.

Abstract: The agricultural harvester 10 cooling system includes a heat exchanger 38 for cooling an internal combustion engine 32 and a heat exchanger air cleaner assembly 36. The heat exchanger air cleaner assembly has a fixed screen 62 adjacent the heat exchanger 32 which forms one wall of a large box 45. Channel members 64 and 66 and flat bars 68 hold the fixed screen 62 in a plane and form a plurality of pie-shaped compartments. The air cutoff plate 78 on rotatable shaft 72 closes the pie-shaped compartments and substantially blocks the flow of air through the fixed screen 62. A suction pipe 84 adjacent the fixed screen 62 and inside the large box 45 rotates with the rotatable shaft 72 directly across the fixed screen from the cutoff plate 78. The suction pipe 84 is connected to the intake of a centrifugal blower 118 by a vacuum pipe 96.

Abstract: The invention relates to an apparatus for the treatment of continuously transported lengths of textile material comprising a housing within which is a rotatable drum filter, an extraction and cleaning nozzle extending approximately axially over the outer peripheral surface of said drum filter, and a blower and duct for establishing a circulating air stream through the textile material and the filter. Fibres extracted from the filter by the nozzle are conducted to and deposited on an air filter that also is located in the housing in a position to be readily accessible for maintenance.

Abstract: The present invention is directed to a dust collector (100). Dust collector (100) has a housing (102) separated by partition (130) into inlet chamber (126) and clean air chamber (128). A clean air drum (140) rotatably supports columns of horizontally extending, filter elements (142). A low pressure, high volume pulse apparatus (10) is operable through blowpipe (148) to sequentially provide a low pressure reverse pulse to a column of filter elements (142) thereby separating any dust cake from them and allowing it to fall into conical portion (106) for removal from collector (100) by air lock (108). The motor (158) which rotates blowpipe (148) also disengageably rotates clean air drum (140) and attached filter elements (142) to align a column of filter elements (142) with door assembly (114) for maintenance.

Abstract: In known air filter assemblies, a mechanism provided for vacuum cleaning of the filter has been located entirely on the upstream side of the filter. In the present filter assembly the vacuum head is mounted on a carriage which is located on the upstream side of the frame which supports the filter and a major portion of the drive mechanism which drives the carriage relative to the filter frame is located on the downstream side of the filter frame. This arrangement serves to reduce the likelihood of contamination of the drive mechanism.

Abstract: The present invention relates to a single-chamber or multichamber bag filter apparatus including horizontal and cross-sectionally flatly oval filter bags, each of which being provided with a rigid internal spacing element terminating at a distance before a perforated wall separating the dust gas side from the pure gas side and being loosely supported thereat. The filter bags including the spacing elements are releasably connected at their closed extremity to supports of an auxiliary wall springily mounted in front of the rear wall of the housing, and this auxiliary wall is coupled to an oscillation generator.

Abstract: The process of removing embedded particulates from the pore surfaces of an ngine air cleaner (pleated paper type) is facilitated by blowing pulses (or jets) of compressed air through the filter media in the reverse flow direction. The invention relates to the employment of a fluidic oscillator for producing the air pulses. The oscillator is used in a switching mode such that alternate pulses are applied to different air cleaner sections. Overall objective is to achieve an effective cleaning action with a relatively small quantity of compressed air.

Abstract: An exhaust cleaner and burner system for use with a diesel engine has a housing with an inlet at one end for receiving exhaust gas from an engine and an exhaust outlet at its opposite end with a particulate filter positioned therein intermediate the inlet and the exhaust outlet having an inlet face axially spaced from the inlet. A fuel burner device is operatively positioned in the housing in axial spaced apart relationship to the inlet face of the filter and is adapted to be connected to an air/fuel mixture source and has an igniter for the air/fuel mixture. A rotatable flame distributor is operatively associated with the fuel burner device whereby to direct a flame discharged from the fuel burner device incrementally across the inlet face of the filter so as to sequentially effect complete burning of collected particulates.

Abstract: An air filter comprising a rotatably mounted drum assembly having a generally cylindrically shaped skeletal framework, with a plurality of side-by-side substantially circular filter media support members projecting radially outwardly from and supported by the cylindrical framework and with each of the circular support members being of modular construction, and wherein each of the circular support members has opposing sloping sides thereof arranged in radially outwardly converging relationship with a band of pliable filter media secured to and overlying the circular support members for rotative movement therewith. Suction apparatus in the form of a plurality of stationary nozzles extend in the valleys between adjacent circular support members for effecting removal of the collected waste from the filter media.

Abstract: Air filtering apparatus with electric controls for varying the speed of filtering as a function of the contamination within the air being filtered. Pressure sensing devices are provided at the input and output ends of the filtering apparatus. The sensing devices are coupled with the electrical controls to either speed up or to slow down the filter cleaning mechanisms when appropriate.

Abstract: In a self-propelled combine, an engine cooling air screen is cleaned continuously by a rotating exhaust sweep moving close to its external surface. The sweep is in the form of a duct with one side open to the screen. Air is drawn into the sweep and exhausted through the cooling fan by way of an air passage having an inlet opening in the center of the screen communicating directly with the exhaust sweep and an outlet immediately ahead of the inlet side of the fan. Power for rotation of the sweep preferably comes from the propeller action of air passing over air deflector or propeller surfaces at its extremities. Alternatively, the sweep may be driven by a more conventional bladed propeller rigidly connected to the sweep but offset rotationally from it.

Abstract: A method for dust removal from a solid-gas contact reactor for dust-laden exhaust gases which includes a packing section composed of packings each having a plurality of passages formed in the flow direction of the gases to be handled. Jets of gas for cleaning use are issued from a bank of stationary or movable nozzles installed in the reactor against the face at the inlet end of the packing section so as to blow off economically and efficiently the dust and other particulate matter that have settled from the gases on the packing section and have grown or bridged as a deposit thereon. The distance from the nozzles to the face of the packing section to be cleaned ranges from 0.2 to 1.0 meter, and the gas jet velocity at the inlet of the same section ranges from 5 to 40 m/sec.

Abstract: This invention relates to the sealing of the aperture rims of cross-sectionally shallowly oval filter bags at the clean gas side of a partition dividing the filter housing into dust gas and clean gas spaces and provided with perforations. Use is made for sealing purposes of a clamping frame placing the aperture rim of each filter bag in contact with the partition at the clean gas side, which is overbridged together with the corresponding partition perforation by a twistable bridging element connected to the clamping frame, at the dust gas side, which bridging element may be placed in resilient contact with the dust gas side of the partition via the bridging element ends and through bulging filter bag portions by means of a spring system bearing on the clamping frame.

Abstract: A device is described for filtering zinc powder from an airstream which is exhausted from a galvanizing process. The device comprises an enclosed chamber to which the airstream is circulated for removal of zinc powder. The chamber has a horizontally disposed bottom surface in which there is a plurality of circular openings which are equally spaced about a vertical center axis and which lead to vertically disposed bag-type filters. An arm is coupled to a vertical drive shaft which is rotatable about the center axis. The arm is designed to move a circular cover from opening-to-opening to individually seal the openings from the chamber, so that the filters can be cleaned of zinc powder. The cover is freely mounted on the distal end of the arm such that the cover is supported on the bottom surface of the chamber as it moves in an arcuate pathway between the filter openings.

Abstract: Vacuum sweep apparatus in an air-filter system which includes a horizontally disposed plate having an array of openings, a plurality of filter bags mounted on the upper side of the plate and communicating with the openings, and a vacuum sweep arm mounted for rotation below the plate. The apparatus includes a base conduit mounted on the arm, in fluid communication therewith, a head conduit, and a flexible, fluid-tight skirt joining the base and head conduits in sealed fluid communication. The skirt accommodates limited multidirectional movement of the head conduit with respect to the base conduit. The head conduit is biased toward the plate so that, as the sweep arm is rotated, an apertured plate-contact member carried on the head conduit is pressed against the plate to seal the air-flow passages formed by successive registries between openings in the plate and an aperture in the plate-contact member.

Abstract: A filter assembly contains a filter drum provided with a stationary air pervious cylindrical filter jacket. The axis of the filter drum preferably extends approximately horizontally. A rotating hollow shaft extends through the filter drum and in radial direction is rigidly connected for rotation to at least one suction nozzle. This suction nozzle serves for sucking-off solid materials through the rotating hollow shaft, these solid materials being separated at the inside of the filter jacket. The hollow shaft carries at least one carriage or slide which is rigidly mounted for rotation in radial direction upon the hollow shaft. For performing oscillating movements in axial direction upon the hollow shaft, this carriage or slide is connected to a device for guiding the at least one suction nozzle along the undulated or wave-shaped path over the inside of the filter jacket.

Abstract: A granular bed filter device comprising two gas-permeable walls bounding an annular filter bed disposed in a housing. The walls extend downwardly in a taper together and are inclined upwardly toward the central axis of the filter bed. A nozzle tube projects from above into the housing and has nozzles which are directed against the inner wall of the filter bed. In order to regenerate the dust-laden filter bed, compressed air is blown intermittently through the nozzle tube while at the same time the nozzle tube is set in motion by a motor. The accumulations of dust contained in the filter bed are ejected in agglomerated form through the outer wall and fall down into the region of a discharging conveyor.