Abstract: An air cleaner including a casing having an inlet for air to be cleaned and an outlet for cleaned air, a filter in the casing separating the inlet from the outlet, a shroud in the casing separating the filter from the inlet, a first valving arrangement operable to enable flow of air from said inlet to said filter or to disable flow of air from said filter to said inlet, and a second valving arrangement operable to prevent inflow of air to said filter or to enable a scavenge flow of air from said filter.

Abstract: Method and apparatus for dusting off gases by filtration and cleaning of filter by aspiration and application thereof to combustion gases.This invention relates to the filtration of dust loaded gases, in particular, combustion gases in the hot state. It consists of passing gases to be dusted off from top to bottom over a bed of pulverulent material, in particular, a sand bed and cleaning the upper layer of said bed by aspiration of dusts deposited thereon. This invention is particularly adapted for dusting off combustion gases from boilers or thermal power stations or gases to be supplied to gas turbines.

Abstract: An apparatus is provided for the cleaning by compressed air of a plurality of separate filter elements, e.g. compact filter cells, grouped around a common center, which have their clean gas outlets situated in the bottom of a clean gas chamber common to the filter elements. A duct of gooseneck shape is connected at its inlet end to a compressed air source and is swivelably mounted so that its outlet end opens out over any one of the clean gas outlets of the filter elements at selectable stations. The duct flares out continuously within a considerable portion of its extension in a direction towards the outlet end, partly within a first and a second portion so that it prevents the expanding and expanded compressed air, respectively from not following the inside of the duct, and partly within a third, terminating portion at the outlet end of the duct which is shaped so as to form a belled portion.

Abstract: An engine air cleaner comprising a cylindrical housing containing an annu perforate cleaning medium and a set of pre-cleaning baffles in the housing space surrounding the cleaning medium. The baffles maintain the dust-laden gas in a swirling condition, thereby centrifugally forcing heavy dust particles away from the cleaning medium surface. A scavenger fan removes heavy dust particles from the housing before such particles can contact the cleaning medium.

Abstract: A nozzle mounting for the stripper nozzle employed for cleaning the filter media of rotary drum filters. The improved mounting is formed by a stripper duct having a stationary portion and a traversing portion telescoping with respect to said stationary portion, and mounted adjacent the drum filter along a line parallel to the axis of the drum filter. The traversing portion of the duct is coupled to and supports a plurality of equally spaced nozzles, and this traversing duct portion is mounted for reciprocation a distance equal to the spacing between the nozzles so that upon reciprocation of the traversing duct portion, each nozzle will be moved across the media surface rotating with the drum to strip waste therefrom, so that all areas of the media will be cleaned.

Abstract: An air jet cleaning apparatus for use with throttling devices mounted in ventilation ducts in which the throttling device includes a body having opposite air inlet and outlet sides and a plurality of fine through passages for conveying air flowing from the inlet to the outlet sides thereof. The apparatus includes a deflector shield mounted adjacent the inlet side of the body to allow for relative movement between the deflector and the body. The shield has an opening facing the inlet side of the body which is caused to sweep over the inlet side during relative movement between the shield and body. A duct provides communication between the shield and the outlet side of the throttling device whereby the drop of pressure across the throttling device diverts a partial air flow through the shield in another direction than the main air flow into the body of the throttling device in order to clean the surface of the inlet side of the body.

Abstract: Apparatus for removing and collecting dust from dust laden air includes a traveling manifold which travels through an upper clean-air chamber back and forth from one end of the baghouse to the other. Process air is directed upwardly and inwardly through the walls of an array of filter bags suspended in a lower chamber. At the upper ends of the filters bags are open mouths which communicate with the upper chamber. Pressurized reverse-direction air is injected from the traveling manifold into the mouths of the filter bags through openings in a flat cover plate. A bag support plate, located beneath the cover plate, separates the lower dust-laden air chamber from the upper clean-air chamber. The reverse air is injected successively into the mouths of a single row of filter bags for forcing air outwardly through the fabric walls of the filter bags to cause dust accumulated thereon to drop off and fall into the lower chamber.

Abstract: An internal loading cylindrical air filter apparatus having a circular tubular knit pile fabric filter element extending unsupported between end plates to provide an essentially full length unobstructed filter area, and having a rotating internal suction cleaning nozzle therefor. The tubular filter element is supported at its entry end by a detachable angle ring having a cylindrical ring flange extending through an opening in the entry end plate of the apparatus to permit endwise assembly and disassembly of the fabric filter element into the apparatus. Annular or helical strands may extend in circumferential engagement with the filter element for restraining it from ballooning out of effective cleaning distance with respect to the rotating suction nozzle under heavy filtering conditions, and a crank may be provided for adjusting the extending length of a helically extending restraining strand for controlling the degree of restaint imposed on the filter element.

Abstract: A cleaning arrangement for a pleated filter includes opposite blower and suction heads parallel to the pleats that move in tandem to effect cleaning. In the preferred embodiment, the heads have air slots that are effectively as wide as a single pleat, the blower slot extends substantially across the entire filter, and the suction slot has two sections that each extend halfway across the filter with the sections being respectively operative as the heads move back and forth.

Abstract: A reversed air system for periodically cleaning one or more filter panels an engine air cleaner. The cleaner system includes an air nozzle at one face of the filter panel and an air receiver at the other panel face. The nozzle and receiver are arranged on ball screws for transverse movement across the filter panel faces. Under our invention, the air receiver has flexible connections with ball nuts that travel along the associated ball screws. The flexible connections have swing flexibility in different planes to alleviate potential jamming tendencies due to manufacturing tolerances, installation variances, and ball screw sag due to the unsupported length of each screw.

Abstract: An improved method and apparatus for removing solid contaminants from the air comprising a generally stationary horizontally disposed cylindrical housing having a pair of spaced opposed vertical end walls and a peripherally disposed filter medium wall extending therebetween to define a filter compartment, a reduced air inlet opening in one end wall for introducing air to be filtered into the compartment and initially directing the same in a path of travel to the other end wall for deflection and recirculation through the compartment in a generally circular path before passage through the cylindrical filter medium wall for filtration thereby, and a plurality of contaminant discharge openings spaced about the lower peripheral portion of the other end wall for directly removing contaminants in the air from the compartment before their entrapment on the filter medium of the unit.

Abstract: An electrostatic precipitator air cleaner including a number of precipitator cells having spaced parallel plates for collecting dirt particles, and a vertically disposed traversing pipe-like spray header containing a number of spray nozzles for directing a spray of wash or rinse fluid onto the collecting plates in order to remove collected particles. The header is traversed horizontally across the precipitator cells by means of a trolley supported by a rail-like guide member and reciprocated between a home position and an extended position by means of a rotating elongated helical drive screw cooperating with a gear-like follower attached to the trolley, such that the rotation of the screw produces linear motion of the header. The header is connected to a source of wash or rinse fluid by means of swivel connections and a flexible conduit.

Abstract: A cleaning arm for a cylindrical baghouse pivoting centrally of the clean air plenum with a cam controlled valve to provide backflushing air to successive concentric rings of filter bags with each full revolution of the cleaning arm.

Abstract: A dust separator which has an inlet enclosure having an inlet for dust-laden gas, an outlet enclosure having side walls and connected to a pipe for discharging the dust-freed gas, a separating wall separating the inlet and outlet enclosures, several elongated filtering elements disposed in the inlet enclosure, each element having a longitudinal axis and an opening at the end emerging into the outlet enclosure, and at least one nozzle having an orifice which has an axis for blowing counter flow declogging gas into the outlet enclosure and into the filtering elements. The axis of the nozzle orifice is directed transversely to the axes of the filtering elements and obliquely to the surface of one of the side walls of the outlet enclosure.

Abstract: Apparatus for filtering a gas stream including a common manifold to which, in use, gas to be filtered is passed, a plurality of gas outlets from said manifold, a plurality of particle separators adapted to remove particles from said gas stream prior to exiting from said gas outlets and wherein said particle separators are adapted to deliver particles separated from said gas stream to said manifold, and a particle outlet from said manifold.

Abstract: A filter apparatus and filtering system which is particularly applicable for extracting particulated material from hot gases comprising a collector overlying a portion of the upstream face of the filter element for applying a reduced pressure to the particulate filter cake formed thereover to effect a dislodgement and recovery of the filtered particulate material. The collector is movable to progressively traverse substantially the entire upstream face of the filter element to effect a cleaning thereof by removal of the filter cake without interruption of the operation of the filtering system. The invention further encompasses a separator for cleaning the granular filter medium withdrawn from the filter apparatus and for recycling the cleaned filter medium back to the filter apparatus.

Abstract: The present invention provides a method of cleaning a filter bed for filtering gas, the bed being comprised of particulate material, the method comprising passing a gas stream through the filter bed from below which being counter current to the direction of flow through the filter bed during filtering, and disturbing at least the upper surface of the bed with a gas stream issuing from a nozzle located above the bed.The present invention also provides apparatus for filtering comprising a support for a filter bed of particulate material, means adapted in use to pass a gas stream through the filter bed from below which being counter current to the direction of flow through the filter bed during filtering and a nozzle located above the bed adapted in use to direct a gas stream to disturb at least the upper surface of the filter bed.

Abstract: A filter for cleaning large quantities of contaminated gas, wherein the gas to be cleaned is passed through a filter medium which is spanned onto a drum. The retained contaminants are removed by a device which wipingly passes over the filter medium. The drum is fixedly connected with a conduit or line through which there is conducted the contaminated gas. The removal device comprises a compressed gas-blast device equipped with at least one jet nozzle and movable over at least part of the outer surface of the drum surrounds the periphery of such drum. The jet nozzle is directed towards the surface of the filter medium. Means serve for the withdrawal of the separated contaminants from the internal hollow space or compartment of the drum.

Abstract: The air filter and vacuum cleaning system includes an air filter unit having partitions and filtering material arranged to define a plurality of air channels between the air entrance and exit ends of the filter. The filter material itself is in the form of a cloth strip of fibrous material such as glass fibers and is wound back and forth about the ends of the partitions adjacent the entrance and exit openings of the filter to provide folds. A vacuum cleaning head is mounted for movement across the entrance end of the filter, the head having a vacuum slot cooperating with the air channels and folds of the filter material to result in high velocity air which will pick up and move slugs of accumulated impurities on the inner folds of the filter material adjacent the air exit end.

Abstract: A filtering separator, in particular a pocket or tube filter, of the kind in which smoke-laden gas containing dust particles of particularly great adhesiveness is fed into a dust collecting trough of a filter housing at the bottom and upwards towards filter elements and in which the filter elements are cleaned periodically by counter-current scavenging and/or joggling. A proportion of the settling dust agglomerated in the filter which corresponds to the amount of dust in the incoming smoke laden gas and which cannot be carried back to the filter surfaces by the smoke-laden gas is removed from said dust collecting trough.A lower part of the dust collecting trough is occupied by a longitudinally extending, rotatably mounted, perforated or sieve-like drum which is arranged to be filled with heavy bodies such as balls. The upper part of the drum is exposed and acts as a dust-collecting store or reservoir to which the smoke-laden gas is fed in order to flow transversely through the drum and its contents.

Abstract: An apparatus which serves to clean air containing fine dust and also larger particles, such as fibrous material, thread ends, etc., which are produced in an industrial environment, especially a textile plant. In order to conduct a two-stage cleaning process without the necessity of dimensioning two filtering stages for the full air flow, there is provided a vortex chamber into which the unclean air is admitted tangentially or in some manner which produces a rotary flow with centrifugal force components which act on the larger particles in the air stream. The vortex chamber includes a rotating filter drum, the interior of which may preferably be provided with suction, causing air to flow from the vortex chamber through the filter, depositing thereon the fine dust carried by the incoming air.

Abstract: A cleaning system for sleeve-type air filters featuring top removal of sleeves of the filtering media and increased filtering capacity, using sharply pulsed backflushing air of short duration from a single source for cleaning the sleeves which requires substantially less power and simpler mechanical structure than conventional filters of similar capacity. Filter sleeves depend from clean air outlet ports which are arrayed in concentric rings in a porting plate in closely-spaced relation one from the next at uniform circular and radial pitches allowing more sleeves to be packed in the porting plate which separates the clean air section from the dusty air section of said filter and more capacity from the same size filter than was heretofore possible. A tank is repetitively charged with air to a set pressure by a pump and the pressurized air is released by a pulse generating valve for distribution of the air to said sleeves for backflushing at essentially random frequency.

Abstract: This invention relates to a tube filter assembly of the kind comprising a housing divided by a perforated wall into a dirty gas chamber and a clean gas chamber, and containing filter tubes which are attached to said perforated wall in a sealed fashion and are arranged to be cleaned periodically by counter-current scavenging from the clean gas side, said filter tubes being arranged in said dirty gas chamber, covering the holes in said perforated wall at their open ends, and being provided with an internal spacer member.

Abstract: A bag type air cleaning apparatus is described for collecting particulate sediment from a source of pressurized air. The apparatus is adapted for connection to the pressurized air source and receives the pressurized air within a cylindrical plenum. A plurality of upright pervious bags are openly associated with the plenum for receiving the pressurized air. The air and particulate sediment is forced upwardly into the bags and against the bag interior surfaces where the sediment will collect as the air escapes through the pervious material. The bags are mounted on upright frames that are collapsible for storage purposes. A sliding duct is provided in communication with a blower mechanism in order to successively clean the inside surfaces of the bags. The sliding duct includes a manifold that comes into contact with successive openings of the bags while being pivoted about within the plenum.

Abstract: A stationary cylindrical drum type filter with self-cleaning capability and suitable for use as a cell or module in a bank of like filter units. A helically wound rod defines a cylindrical shape over which a foraminous web is supported in tubular configuration to form a filter element. A suction nozzle is disposed inside the filter element closely adjacent thereto and drive means causes the nozzle to rotate and traverse the filter element between and guided by the adjacent coils of the helix, and controls cause the spiral motion of the nozzle to reverse upon reaching each end of the filter element, and to start and stop in response to predetermined pressure drops through the filter.

Abstract: A cleaning purge head for a baghouse traveling centrally of the clean air plenum to isolate and back flush with high pressure air successive compartments of filter bags arranged in two parallel banks of filters. Through a depressible seal, the purge head communicates with a pressure chamber supplying cleaning air. A cam activated valve regulates the bursts of cleaning air supplied to successive filter bag compartments as a delivery conduit registers therewith such that the purge head alternates in cleaning the two banks of filters on successive passes through the baghouse.

Abstract: A system for producing a reverse blast of air to dislodge from an air-filter element contaminents that are captured on the surface of the element in response to forward flow through the element. A manifold pipe spanning one or more openings at the outlet end of the filter elements and a nozzle supported on the manifold pipe in alignment with each element opening. Associated with the nozzle and secured to the manifold pipe for rotation in unison therewith is a venturi which, when rotated into an active position substantially covers the opening so that when air is supplied through the manifold pipe to the nozzle, the reverse blast is effective in dislodging contaminents on the exterior of the element. The manifold pipe is rotatable to an inactive position at which the venturi and nozzle are virtually clear of the outlet openings so as to avoid impedence to air flow through the filter.

Abstract: A cleaning purge head for a baghouse traveling centrally of the clean air plenum to isolate and back flush with high pressure air successive compartments of filter bags arranged in two parallel banks of filters. Through a depressible seal, the purge head communicates with a pressure chamber supplying cleaning air. A cam activated valve regulates the bursts of cleaning air supplied to successive filter bag compartments as a delivery conduit registers therewith such that the purge head alternates in cleaning the two banks of filters on successive passes through the baghouse.

Abstract: A self-cleaning filter for a particulate-laden gas stream. A circular filter surface is positioned in the gas stream exhaust and includes a centrally mounted drive train. An elongate rotor transverses the face of the filter surface and is centrally coupled by a flexible joint to the drive train for rotative drive. Wheels mounted on each end of the rotor engage a circular track at the periphery of the filter surface; one wheel is spring biased to continually force the wheel at the opposite end of the rotor against the track. A vacuum cleaning head is associated with the arm of the rotor opposite the spring biased wheel to remove particulate matter collected on the filter surface.

Abstract: A system for filtering stack gases and the like comprising an in-feed exhaust duct and a pair of filter vat cleaners disposed on opposite sides of the in-feed exhaust duct and horizontally spaced therefrom. A track assembly extends horizontally above the in-feed exhaust duct and filter vat cleaners, and a carriage car carrying two horizontally spaced filter containers is mounted rollably on the track assembly for reciprocating movement therealong to alternately position one of the filter containers over the exhaust duct, and then the other over one of the two filter vat cleaners, in alternating sequence. Coupling means is provided for coupling the filter containers with the respective filter vat cleaners and the exhaust duct. An out-feed exhaust duct is positioned over the track assembly and carriage and is vertically aligned with the in-feed exhaust duct.

Abstract: An apparatus for cleaning air charged with contaminants, especially fibers and dust, comprising a pre-separator and a dust filter arranged after the pre-separator. At least one movable suction nozzle is effective at the surface of the dust filter. The pre-separator, constructed as a body of rotation, possesses an inlet portion structured for producing a spin flow and a jacket portion structured as a sieve surface which is surrounded by a rotatably mounted filter drum of the dust filter. A cylindrical filter body of the filter drum has operatively associated therewith at the inner surface thereof the movable suction nozzle, and drive means are operatively connected with the suction nozzle and filter drum.

Abstract: A rotary sweep arm for a self-cleaning filter apparatus in which the nozzle of the sweep arm is provided with a plurality of radially spaced vanes adjustable for equalizing the vacuum along the radial extent of the sweep arm.

Abstract: A filtering device is disclosed for removing particulate solids from a continuously flowing gas stream and which comprises a filter chamber that contains filter bags from which filtered gas is discharged into a plurality of plenum chambers arranged in a radial pattern around the axial center line of the filter. A pressure blower for a cleaning gas is located centrally with respect to the plenum chambers, and the casing of the blower is intermittently revolvable and has an outlet which sequentially falls into alignment with outlets in the plenum chambers through which filtered gas normally flows outward, but through which the cleaning gas is injected inwardly when aligned with the outlet of the blower casing, thereby providing means for intermittently reversing the gas flow in the filter bags and momentarily generating a pressure therein which is greater than exists in the filter chamber.

Abstract: A particle laden gas stream is cleaned by passing it through an all metal fabric including a base with pile fibers connected to the base. The flowing gas forces the pile fibers to lie down upon each other to form a depth filter media adapted to entrap fine particles. This depth filter media is cleaned to remove entrapped particles by passing air through the fabric in a direction counter to the direction the particle laden gas flows through the fabric. Consequently, the pile fibers tend to open and extend outwardly from the base, permitting entrapped particles to be carried by the air from the fabric. Apparatus including a tubular element made of an all metal pile fabric is also disclosed. The tubular element has associated with it one or more nozzles adapted to blow air through the fabric along an incremental portion of the tubular element. Consequently, a small portion of the fabric is cleaned while simultaneously the remainder of the fabric filters particles from the gas stream.

Abstract: An air filter cleaner is disclosed which is portable and which may be used on the job site for the cleaning of air filters of heavy construction equipment. The air filter cleaner is lightweight and may easily be carried or moved by a single person. The filter is comprised of a base member and an upper member. The filter to be cleaned is inserted between the base member and the upper member. The upper member is provided with a vertically depending rotatable pipe means provided with radially directed nozzles. The pipe means is also provided with a pair of nozzles directed at an angle to the radial to provide a rotary movement to the pipe means. The air filter cleaner may be operated from air compressors readily available on the job site, such as compressors on the heavy construction equipment itself, during normally scheduled down times such as lunch hours.

Abstract: A control mechanism for apparatus for cleaning of fluid filters by a jet of fluid directed toward a filter in a direction reversed to that of the flow of fluid to be filtered through the filter element. An elongated manifold extends across the downstream or clean fluid delivery side of the filter element, and has a plurality of aligned apertures extending longitudinally of the manifold and facing the adjacent side of the filter element. A plurality of valve elements are mounted in the manifold for movement toward and away from closing relationship with the apertures, and are yieldingly urged toward closing relationship with their respective apertures. A rotary cam shaft is journaled in the manifold and includes a plurality of cams each associated with a different valve element. A pawl and ratchet arrangement is operative to open each of the valves in succession responsive to movement of the manifold across the side of the filter element.

Abstract: An improvement in air filtering apparatus of the type having means for providing intermittent reverse flow of air through the filter media of the apparatus to dislodge any accumulations of material from the filter media. Such apparatus is conventionally formed with a collecting air chamber receiving the air to be filtered, which is then fed to a filtered air chamber separated from the collecting chamber by a grid plate with air passages therethrough. Filter media such as filter bags or the like are arranged in the grid plate air passages to filter the air passing through to the filtered air chamber. The invention provides an improved air plenum blower fan arrangement providing a relatively straight reverse air flow path from the fan discharge to improve the efficiency of air transfer between the fan and the filter media to effect desired cleaning of the filter media.

Abstract: Device for the powder reclamation, specifically in electrostatic powder coating systems comprising a dust filter with a partition installed in an enclosure in a fashion such that a suction chamber for the air-powder mixture, which can be connected with the exhaust of the system, is created with a channel which passes the filter and has a constricted cross section while emptying into a funnel-shaped bottom part of the enclosure which may be detachable and can be sealed on the underside via a flange, above which channel there are arranged filter medium layers with upward extending passage openings which connect to an exhaust chamber with an air suction pump, in which chamber a compressed-air nozzle assembly is provided which can be moved across the filter medium layers for their blowout and cleaning.