Abstract: In an exhaust gas cleaning apparatus a ceramic heating resistor has a lattice-shaped exhaust gas passage and is formed by extrusion. The ceramic heating resistor is fixed closely to the upper stream side of a filter which catches particulates contained in exhaust gas. This heating resistor is divided into a plurality of sections so that heating current is successively supplied to the divided sections.

Abstract: An exhaust gas cleaning device provided with a filter member for collecting carbon particulates in exhaust gases discharged from a diesel engine and an electric heater for burning off the particulates collected by the filter member, is disclosed. The filter member is composed of a large number of intersecting porous walls which define a large number of inlet gas passages and outlet gas passages which are adjacent to each other. The electric heater is composed of at least one film-shaped heating resistor which is directly formed on the upstream end surface of the filter member so as to be integral therewith. When the amount of carbon particulates collected by the filter member reaches a predetermined level, electric current is supplied to the electric heater. The carbon particulates adhered to the upstream end surface of the filter member are ignited and burnt off. Then, the combustion of carbon particulates spreads to the other carbon particulates collected in the other portion of the filter member.

Abstract: Means are provided for continuous filtration of foreign matter from a fluid stream, without requiring a discontinuance of filtration to clean filter surfaces. The apparatus alternately directs the fluid to be filtered to one or another of a plurality of filter compartments, each containing a filter medium. Sensing means are provided to sense the condition of filter clogging in the compartments, and diverting means are provided to divert the flow of fluid to a compartment having a relatively clean filter, when a clogging condition is sensed. Thus, the fluid stream is always directed to a filtering compartment having relatively clean filter media therein. Additionally, means are provided for cleaning the filter medium in a compartment not being used.

Abstract: An improved method of sequentially cleaning filter elements (14) housed in a plurality of filter chambers (12) collectively forming a fabric filter collection apparatus (10) wherein the cleaning operation is controlled in response to an upper limit of pressure differential across the dust collection apparatus. Whenever the pressure differential across the dust collection apparatus (10) reaches the upper limit value, one of the chambers (12) is isolated, the filter elements (14) housed therein are cleaned, and then the isolated chamber is returned to service. Each of the individual chambers (12) is isolated in sequence and the filter elements therein cleaned with the interval between consecutive isolations and cleanings being the time required for the pressure differential across the dust collection apparatus (10) to again reach the upper limit value of pressure differential.

Abstract: A filtration system is disclosed which removes particulates from the exhaust gas of a diesel engine. The system has (a) a filter element, (b) oxidation means for conducting a flow of heated gas through at least a portion of the filter element, the heated gas being effective to ignite the particulates in that portion, and (c) a flow control means. The flow control means has walls dividing the filter element into first and second portions, and a flow diverter effective to normally permit full exhaust gas flow through both of said filter portions, and effective to selectively permit exhaust glow through only one of the filter portions while permitting flow of heated gas of the oxidation means through the other of said filter portions.

Abstract: Particles contained in the exhaust gas discharged from an internal combustion engine are trapped by a particle-trapping-member disposed in an exhaust gas flow path. The flow rate of the exhaust gas is measured directly or indirectly, and the pressure loss for the trapping member is compared with an exhaust gas flow rate to measure the degree of clogging trapped by the trapping member. When the degree of clogging exceeds the predetermined valve, a command signal for closing an intake throttle is generated to reproduce said particle-trapping-member.

Abstract: An improved method of cleaning a fabric filter collector (10) housing one or more filter chambers (12) wherein the cleaning operation is monitored to actuate an alarm (54) if the pressure differential across the collector after any particular cleaning operation exceeds the pressure differential across the collector at initiation of that cleaning operation.

Abstract: An air cleaner assembly is provided for supercharged engines including a supercharger compressor, comprising a vortex air cleaner upstream of the supercharger compressor, and a rotatable barrier filter cartridge that is self-cleaning downstream of the supercharger compressor.

Abstract: A layer of particles of carbon black is used as a filtration medium in the separation of carbon black from a gaseous stream containing carbon black.

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: A device for filtering dust from air drawn by apparatus from a factory shop or building, for example a steelmaking shop, including a plurality of dust extractors which have a total capacity at least equal to the air throughput of the drawn air. The extractors have regulators by which they can be regulated individually or in groups. Preferably each extractor is associated with an individual dust extractor and also each extractor preferably has its own individual cleaning system. The extractors are preferably of the dry filter bag type.

Abstract: An exhaust gas cleaning device for collecting carbon particulates in the exhaust gases, is disclosed. The device is provided with a filter member formed of a material having interconnected pores and an electric heater which is buried within the exhaust gas inlet end portion of the filter member. According to the exhaust gas cleaning device of the present invention, the carbon particulates collected in the inlet end portion of the filter member is directly heated by means of the electric heater which is provided in the inlet end portion of the filter member. Therefore, carbon particulates can be ignited by a small amount of electric power.

Abstract: A diesel exhaust particulate trap is provided with a heat resistant particulate filter which includes a perforated and pleated metal substrate member coated with a ceramic fiber filter material on its interior surface so as to define a filter chamber for the inside-out flow of exhaust gases through the filter. In a preferred embodiment, an electrical particulate filter igniter is associated with the filter. The igniter includes a trap door pivotably secured to the substrate member, which is normally biased to a closed position by a spring but which can be opened by exhaust flow prior to an accumulation of particulates on the filter. Opening and closing of the trap door is used to effect deenergization and energization, respectively, of an electrical heating element used to initiate combustion of particulates.

Abstract: A vertical media bed dust collector in which the media bed of a filter panel is rejuvenated when necessary by interrupting the gas flow through the panel, withdrawing the filter media from the panel, separating the agglomerated dust from the filter media, returning the filter media to the filter panel, and reestablishing the gas flow through the panel. The system further includes apparatus for removing collected dust from the separating and recirculating surfaces of the media handling apparatus and also from the remote face of the filter panels before the cleaned gas is allowed to pass out of the collector so that the cleaned gas is not recontaminated by small amounts of dust adhering to those surfaces.

Abstract: A carbon particulates cleaning device for use in a diesel engine of an automobile or the like comprises an exhaust gas main pipe, an exhaust gas branch pipe diverged from the exhaust main pipe, a carbon particulates catching member which is provided within at least one of the exhaust gas main pipe and the exhaust gas branch pipe, a valve means by which exhaust gas is selectively supplied into the exhaust gas main pipe or the exhaust gas branch pipe, a heating means which heats the carbon particulates catching member, a gas supplying means which supplies gas into the carbon particulates catching member when the carbon particulates catching member is heated and a control means which controls each operation of the valve means, the heating means and the gas supplying means.

Abstract: Effluent with entrained particles is drawn through a filter module (A) by an exhaust blower (B). The filter module includes an inertial separator (C) for providing an inertial separation of particles from the effluent air and a plurality of filter cartridges (D) which allow air to pass therethrough but not particles. A plenum E interconnects the filter cartridges with the exhaust blower to channel the filtered air from the filter module to the exhaust blower. A flow controller (F) controls the flow rate of air through each of the filter cartridges maintaining it substantially constant. The flow controller includes a flow rate sensor for sensing the flow rate through each filter cartridge and a butterfly damper blade for selectively restricting the plenum to maintain the flow rate substantially constant. A filter cartridge cleaner (G) is selectively actuated when the flow controller is unable to maintain a preselected minimum flow rate.

Abstract: A compact, self-cleaning, cabinet, dust collector is provided. The collector housing is a single-piece, molded unit having recessed areas and a molded air inlet. Entering dust-laden air is directed into two flows in a passageway surrounding a suspended, flexible, pleated filter element. An inner wall of the passageway contains a precleaner upstream from the filter element. A collector ramp, at the bottom of the passageway, directs pre-cleaned matter to a removable hopper. A fan, supported above the open upper end of the filter element draws air through the collector. A fan motor is isolated from the housing interior in one of the recessed areas of the housing. To gain access to the filter element the fan is rotated upwardly and away from the filter element. To prevent the pleats of the element from collapsing, hot-melt spacers are provided on the pleat surfaces. The element is flex-cleaned by a rotatable mechanism located beneath and adjacent the bottom closed end of the element.

Abstract: A method and device for removing soot from the exhaust gases of a diesel-type internal combustion engine, using a soot filter in the exhaust line and a dosing device which injects a dose of a combustion-inducing substance, for example CuCl, into the soot filter by means of compressed air. The soot-combusting process is initiated automatically, in response to a critical exhaust pressure level and the simultaneous presence of a suitable temperature in the soot filter, using a pressure switch and a series-connected thermal switch. Compressed air, flowing through a bypass line, scavenges the supply line of the combustion-inducing substance, while supplying additional oxygen for the soot combustion process.

Abstract: In pneumatic low pressure dust extraction apparatus, filter bags are cleaned by reverse flow of air. Each cleaning operation includes a first shock phase of short duration (not longer than 0.05 sec) but at high flow intensity by which accumulated layers of dust are thrown off the outside of the bag, followed by a rinsing phase of greater duration (not longer than 1 sec e.g. 0.20-0.30 sec) but at lower flow intensity during which remaining dust is blown out of the filter cloth and the cloth is allowed to lie back gradually on its support. The apparatus includes a cleaning-air tank incorporated in the filter housing for storage of compressed air in the close vicinity of apertures of the filter bags. The height of the tank exceeds its distance from the bag apertures. There is a valve for each filter bag and it has delivery means extending into the region of the bag aperture. The duration of the reverse flow for cleaning is adjustable for obtaining optimum results suited to the operating conditions.

Abstract: An apparatus and method is disclosed for separating entrained particulate matter from a conveying fluid. Particulate matter is collected and deposited in an overlying porous layer on an upstream side of a filter support (22) and then used as a filtering medium ("M") of enhanced filtering capacity. The invention includes a housing (10) having a filter support (22) positioned therein. A filter making zone (36) is defined within the housing (10) by fluid flow through a first predetermined part of the filter support (22) from its upstream to its downstream side for collecting the entrained particulate matter into an overlying porous layer. A filtration zone (37) is defined within the housing (10) by a fluid flow through a second predetermined part of the filter support (22) from the upstream to the downstream side thereof. The filter support (22) has thereon the overlying porous layer of particulate matter ("M") made in the filter making zone (36).

Abstract: A layer of particles of carbon black is used as a filtration medium in the separation of carbon black from a gaseous stream containing carbon black.

Abstract: A plural bag dust collector filter apparatus for filtering air to remove dust and similar contaminants therefrom including a plurality of vertically elongated tubular cylindrical upwardly opening filter bags and respective associated shape-maintaining skeletal cylindrical wire cages inwardly lining the filter bags arranged in transversely plural longitudinal rows of plural filter bags each in a box-like chamber, and a shake-down mechanism comprising vertically elongated beater rods located respectively within and depending substantially throughout the vertical height of the respective filter bag cages and their associated filter bags. Rotatable crank arms pivotally coupled to the opposite ends of supporting bars for the beater rods and a powered drive therefor are provided to impact the beater rods inwardly against their associated cages and develop sufficient force to dislodge dust build-up on the surfaces of the filter bags.

Abstract: An apparatus and method for destructively removing particles from a flowing gas containing the particles. In the specific embodiments disclosed the apparatus is adapted to remove carbon particles from diesel engine exhaust products. The exhaust products are directed to a predetermined location where they are rapidly vaporized and combine with oxygen in the exhaust products to form carbon dioxide. Vaporization in one embodiment is effected by a discharge grid 30 located within an exhaust conduit 22, the grid 30 being chosen so that alternate conductors 32 and 34 defining the grid 30 are spaced apart a distance approximately 125 times the mean diameter of the particles to be removed. A voltage differential of approximately 690 volts is applied across adjacent conductors 32 and 34. Presence of a diesel exhaust particle between these conductors 32 and 34 is sufficient to create an electric spark discharge enveloping the particle, thereby resulting in a rapid vaporization and oxidation of the particle.

Abstract: A self-cleaning paper trap for use within a dust control system and mounted in the duct to trap sheet materials. The paper trap includes a housing which carries a plurality of spaced grid bars to trap the sheet materials and a wiper bar which is vertically reciprocal relative to the grid bars to wipe trapped sheet materials from the bars. An automatic cable control apparatus is operatively engaged with the wiper bar to permit remote wiper bar actuation without the need for system shut-down.

Abstract: Apparatus for raising the temperature of internal combustion engine exhaust gases high enough to burn collected particulate material from particulate filter means (27/56) in the exhaust system. An electrical resistance heating element (37/71) which confronts only a small part of the inlet surface of particulate filter means (27/56) is moved relative to said inlet surface so as to progressively and cyclically burn the particulates from the filter means.

Abstract: An apparatus is disclosed for separating entrained particulate matter from a conveying fluid. Particulate matter is collected and deposited in an overlying porous layer on an upstream side of a filter support (22) and then used as a filtering medium ("M") of enhanced filtering capacity. The invention includes a housing (10) having a filter support (22) positioned therein. A filter making zone (36) is defined within the housing (10) by fluid flow through a first predetermined part of the filter support (22) from its upstream to its downstream side for collecting the entrained particulate matter into an overlying porous layer. A filtration zone (37) is defined within the housing (10) by a fluid flow through a second predetermined part of the filter support (22) from the upstream to the downstream side thereof. The filter support (22) has thereon the overlying porous layer of particulate matter ("M") made in the filter making zone (36).

Abstract: Fibers and lint floating around a spinning machine are aspirated into a system comprising a plurality of filter boxes, each filter box being divided by a screen into a lower raw-air compartment and an upper clean-air compartment, the latter containing a blower serving to circulate incoming air from the screen to a normally open discharge duct. The raw-air compartment has a permanently open intake duct for the aspirated air and is further provided with a normally closed suction duct communicating with a central exhauster common to a group of such filter boxes. From time to time, or when a sensor detects an excessive pressure in the raw-air compartment due to accumulation of solids on the entrance side of the filter screen, the suction duct is opened and the discharge duct is closed whereby the solids are enabled to drop off the screen for removal by the exhauster to a central receptacle.

Abstract: A device for removing fine carbon particles from exhaust gas emitted by automobile diesel engines or the like thereby to clean the exhaust gas. The device incorporates a filter for collecting fine carbon particles suspended by the exhaust gas. After a predetermined amount of fine carbon particles is accumulated on the filter, the carbon particles are burnt to regenerate the filter. The detection of amount of carbon particles accumulated on the filter is made through the detection of the fuel consumption of the engine or the differential pressure across the filter.

Abstract: A smoke filter element adapted to remove solid particles from an internal combustion engine's exhaust gas stream includes a bed which forms a multi-passage path along which the carbon particles are retained. A heating system incorporated into the filter periodically heats the flowing exhaust stream, as well as the bed. Rejuvenation of the bed by burning off carbon is automatically prompted when filter pressure and temperature reach predetermined levels. Concurrently the engine throttle is adjusted to a preferred engine speed whereby ideal conditions for burning are established.

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: A central vacuum or air cleaning system handling fibrous materials such as spilled cotton waste in a cotton gin or lint in a textile mill, chaff in grain handling and/or wood dust and dirt in lumber industries and other air contaminating industrial processes. Dirt and lint laden air is drawn into a bin structure with a drum filter or condenser at the top that rotates through an area in operational contact with doffer rolls that remove drum filter deposited lint and dirt to fall down a still chamber provided with an internal plate or baffle extending downwardly from the tower doffer roll a substantial distance approximating one-half the vertical length of the bin. This eliminates pressure differential across the critical area of the doffer rolls that is encountered with filter drum and doffer roll structure delivering deposited lint and dirt waste directly to the exterior.

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: The invention relates to filtration apparatus and to a process for a filtration installation comprising several filtration cells equipped with at least one filtering element through which passes a current of dust-laden gas, this process consisting in isolating the filtration cell to be declogged, then in proceeding with declogging the filtering element(s) of this cell, and wherein further, after having isolated the filtration cell and before proceeding with the declogging thereof, it is scavenged by a counter-current of an inert gas, this counter-current scavenging being carried out under conditions such that the inert gas completely renews the atmosphere of this cell, without causing the layer of dust deposited on the upstream face of the filtering element(s) of said cell to be detached.

Abstract: An apparatus for removing non-gaseous pollutants from exhaust and flue gases produced by the burning of a fuel in which the exhaust or flue gases are intervally passed through one of a first filter means and a second filter means, a combustion supporting gas is supplied to the other of the first filter means and the second filter means during at least a part of the interval during which the exhaust or flue gas is passing through the one of the first filter means and the second filter means and non-gaseous pollutants, which have collected on the other of the first filter means and the second filter means are burned from the other filter means in the presence of the combustion supporting gas during the at least part of the interval during which the exhaust or flue gas is passing through the one of the filter means.

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 method of controlling the cleaning process for the cleaning of textile barrier filters, for example bag filters, subsequent to dust precipitation on the filter material. The cleaning is carried out with a cleaning system (14) comprising means (16,17,18) for distributing compressed air pulses to the filter bags (4). The gas flow often shows great variations in flow, temperature and dust content, thereby giving rise to problems in the control of the cleaning process in such a manner, that neither over-cleaning nor under-cleaning occurs. For the control, the filter load v.sub.f is measured which is the ratio of the gas flow (m.sup.3 /s) and the filter area (m.sup.2), as well as the pressure drop p.sub.f over the filter material. In applications with great temperature variations of the gas, also the absolute temperature T is measured. The measuring results are processed in an electronic unit (26) for calculating the filter resistance S, which is the ratio p.sub.f /v.sub.

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: Dust-like or dust containing solids are passed into a pressurized system via a lock chamber apparatus wherein a porous filter is provided separating the lock chamber into an upper space and into a lower space. Normally a pressurized gas is passed into the lower space and it is discharged from the upper space during the pressure release phase after passing through the filter. When a predetermined differential pressure is exceeded between the upper and the lower space of the lock chamber because of a clogging up of the filter the filter is cleansed by passing the pressure gas partially or totally into the upper space of the lock chamber so that it passes through that filter in the direction reverse to that during the pressure release phase.

Abstract: A filter medium for use in a vacuum cleaner is shown with external brush means which is movable across the filter face for cleaning the soil therefrom. The brush means may either be moved manually, by automatic controls, by time switches, by pressure differentials operating in a piston-cylinder arrangement, or by a pressure indicator unit which monitors the clogging condition of the filter. Moreover, control means are provided for protecting the vacuum cleaner drive motor from damage from liquids when liquids may be drawn into the vacuum cleaner.

Abstract: An apparatus and method for separating entrained particulate matter from a fluid wherein particulate matter is collected in an overlying porous layer on an upstream side of a rotatable, fluid-permeable filter in a first chamber, and rotatably conveyed into a second chamber and used as an additional filtering medium. The filter comprises a cylindrical drum having a filter surface thereon and is rotatably mounted in an enclosed housing having a fluid inlet and a fluid outlet. Fluid pumping means operatively communicate with the housing for inducing a flow of fluid into the housing through the inlet and out of the housing through the outlet. Chamber means are disposed within the housing and sealingly cooperate therewith and with the cylindrical drum and define a first chamber fluidly communicating with the inlet and a predetermined portion of the cylindrical drum on the upstream and downstream sides thereof.

Abstract: A contaminated air stream from a textile operation which includes lint, short fibers, dust and other small particles is subjected to a progressive or multi-stage filter system, in which a first stage includes a rotary drum filter covered with a fine mesh screen covering which separates the lint and long fibers from the short fibers and dust which are carried on to a second stage. At the second stage filter, which is also a rotary drum filter but covered with a media type filter material, the short fibers are separated. The remaining dust and very small particles are passed on to a third stage, which is also a rotary drum filter covered with a media of even greater density than the second stage.Each of the rotary drum filters are provided with suction nozzles or other vacuum cleaning apparatus some of which are selectively moveable radially of the drum into close proximity to the surface of the filter for the purposes of periodic cleaning thereof and to a removed position in situations of non-cleaning.

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: In a fluid passageway a filter panel is selectively moved out of its normal position extending across the fluid passageway to a dumping position out of the fluid passageway such that particulate matter collected thereon is removed responsive to the movement of a baffle plate from a normal position out of the fluid passageway into a position blocking the fluid passageway. Thereby passage of air through the fluid passageway is prevented during the time the filter panel is out of its normal position. In a preferred embodiment a linking mechanism connects the baffle plate and filter panel together so that movement of the baffle plate to the blocking position causes the filter panel to drop to a dumping position and return of the filter panel to its filter position causes the baffle plate to drop to its normal position. The whole sequence is instituted responsive to buildup of particulate matter on the filter panel.

Abstract: A self-cleaning air cleaner having a housing with a first partition dividing the interior of the housing into a first generally vertically elongated chamber and a second generally horizontally elongated chamber. The partition lies in an oblique plane at an angle with respect to the elongation axes of the first and second chambers and has an opening which provides fluid communication between the first and second chambers. A fan or blower is provided within the housing for drawing air through the housing from a dust-laden air inlet to a clean air outlet. A filter is mounted within the housing and disposed to filter the air passing through the opening in the partition. A reverse pulse air valve is disposed within the housing to direct a pulse of cleaning air into the filter to dislodge the dust collected thereon. An electrical control circuit is provided for actuating the reverse pulse air valve which is connected to a suitable source of compressed air.

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 for neutralizing and purifying air comprises an air filter, a preliminary drier, two alternately operable driers, a turbine for moving the air, a cooling unit, a heating unit, a moistening unit, at least one conditioner, and connecting means for outputting the treated air. The cooling unit lowers the temperature of the air, and comprises a separator for liquids and a separator for solids. The heating unit brings the temperature of the air back up to between 250.degree. and 450.degree. C.

Abstract: A self-contained self-cleaning air cleaner that includes a housing with a first partition mounted within the housing to divide the interior of the housing into a clean air chamber and a filtering chamber. The first partition has an opening which provides fluid communication between the filtering and cleaning chambers. A filtering apparatus is disposed within the filtering chamber to provide filtered fluid communication between the filtering chamber and the clean air chamber through the opening in the partition. A fan or blower is mounted within the housing for drawing air through the housing from a dust-laden air inlet which opens into the filtering chamber to a clean air outlet which opens into the clean air chamber. A small capacity compressor is integrally mounted within the housing and is directly driven by the fan or blower.

Abstract: A filtering apparatus for the filtering of fibers and equivalent material from flowing air, and in particular for use in textile operations, has been invented in which the fiber material is firmly compacted so that as much fiber material as possible may be accommodated in a given volume of a collecting container attached to the filtering apparatus. For this purpose the filtering apparatus has a hollow fiber filtering assembly into which the flowing air is guided, a conveyor screw and a motor to drive the conveyor screw toward an outlet of the filtering assembly. The filtering assembly also includes at least one filter, with the outlet located downstream in the direction of movement of the fiber material, and at least one braking component located near the outlet which serves to brake the motion of the fiber material induced by the conveyor screw and to compact the fiber material firmly.

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 roof drill dust collector is disclosed which comprises a closed housing in which dust-laden air is carried through a first stage dust separator, a second stage dust separator, and a third stage dust filter, before being expelled to open air. The first and second stage separators deposit dust in first and second collection chambers having a common floor, being a hinged door. The housing has means therein for automatically, in sequence, spraying streams of water on the collection chamber walls, opening the hinged door to dump the collected dust, sending a reverse pulse of air through the third stage filter, and closing the hinged door.