Abstract: In an exhaust system of an internal combustion engine, an exhaust pipe is reliably bent and deformed during vehicle rear collision while improving drainage performance in the exhaust pipe in normal times. The exhaust system 1 includes a second pipe 17 corresponding to a downstream end part of an exhaust pipe 10 through which exhaust gas flows from an engine 2. The second pipe 17 includes: a fragile part 30 as a starting point of bending deformation of a tail pipe 13; and a partition plate 20 vertically dividing the inside of the second pipe 17 to form, under the partition plate 20, a lower passage 7 to flow water that accumulates in the exhaust pipe 10. The partition plate 20 is in a vicinity of the fragile part 30 and at a position not overlapping with the fragile part 30 in an axial direction of the second pipe 17.

Abstract: A separator comprises a separator housing section forming an at least partially cylindrical inner wall with respect to a vertical axis, a funnel-shaped upper member with a large diameter portion being attached to said inner wall, a funnel-shaped lower member with a large diameter portion being attached to said inner wall at a position lower than said large diameter portion of said funnel-shaped upper member, an inlet opening arranged for leading fluid into said separator housing section at a position between said large diameter portions of the upper and funnel-shaped members with a flow direction of said fluid having at least a tangential component at said inlet opening. Said upper and lower funnel-shaped members each have axial openings at respective lower end portions opposite to said large diameter portions.

Abstract: A work vehicle includes an engine, a post-processing device, and a cooling fan. The engine is mounted on a front portion of a travelling machine body. The post-processing device purifies exhaust gas of the engine. The cooling fan water-cools the engine. The cooling fan is located in front of the engine. The cooling fan, the engine, and the post-processing device are covered with a hood. The hood includes a shield. The shield covers a lower section of the post-processing device and one side of the engine. The shield is a perforated plate including a plurality of holes.

Abstract: An exhaust flue cap and filter device for a gas fired appliance in communication with an exhaust flue opening. The device includes an inner collar to engage the exhaust flue opening. A tubular cap with a closed lower end is in communication with the inner collar. A filter tray is suspended in the tubular cap wherein the filter tray has a smaller diameter than the tubular cap so that a bypass space is formed between the filter tray and the tubular cap to permit passage of exhaust gases. A removable filter insert is receivable in the filter tray. A removable top having a body with exhaust openings is attached to and closes the open upper end of the tubular cap.

Abstract: A radial U-flow adsorption unit for air purification in a TSA process, having a gas outlet at one end and at least one gas inlet at the side, preferably at the same end of the unit as the gas outlet. The simpler design of the unit facilitates manufacture, installation and transport, and reduces the capital and operating costs.

Abstract: Embodiments of the present invention provide an inlet particle separator for a gas turbine engine having an inlet flow path, a scavenge flow path, a core flow path, and a flow splitter disposed between the scavenge and core flow paths. A plurality of grooves may be disposed about an inner surface of a wall of the separator within the inlet flow path.

Abstract: The present invention relates to an air cleaner for the removal of pollutants from an air flow by a filter module, the filter module of which includes at least one permeable filter layer for the accumulation of pollutants on the filter layer. A bypass channel will be provided and established such that part of the unfiltered air flow may bypass any filter layer. Such a bypass channel does not compromise the cleaning effect of the filter module, at least as long as the filter layer has not yet been clogged with pollutants since in this case the biggest part of the air flow will take the major path through the filter layer due to lack of resistance. Only if the filter layer is clogged and if resistance for the air flow increases, air will obviously flow through the mentioned bypass channel.

Abstract: The present invention relates to a coupling head for coupling a towing vehicle to a trailer. According to the invention, in the coupling head a filter element is used. The filter element is bypassed by a continuously open by-pass. Preferably, the path through the by-pass has at least one redirection in the region of an undercut. As a result of the redirection, contaminants in the compressed air are not or not fully transferred through the by-pass. The by-pass might also ensure a supply of compressed air to the trailer, for example, when the filter element is at least partly blocked due to the contaminants. According to the invention, a valve element used to open the by-pass in the case of increasing blockage of the filter element is not required.

Abstract: A liquid and air separator includes a housing having a sloped floor and a domed roof, an adaptor, a spacer, a deflector having a plurality of perforations thereon, and a plurality of breathers, each of the plurality of breathers having a stepped portion.

Abstract: A filtering apparatus having a plurality of passages made up of juxtaposed longitudinally extending channels. The passages are axially divided by a porous filtering media extending across the channels whereby the channels fluidly communicate through the porous filtering media. A pressure differential is created across the filtering media by restricting flow through an end of each channel, with each restriction being at an opposite end from that of the other channel. As flow restriction rather than outright blocking is used, some flow is possible along each passage directly along the channels even if the channels lose the ability to fluidly communicate through clogging of the filtering media.

Abstract: The present invention relates to an air cleaner for the removal of pollutants from an air flow by a filter module, the filter module of which includes at least one permeable filter layer for the accumulation of pollutants on the filter layer. According to the invention, a bypass channel will be provided and established such that part of the unfiltered air flow may bypass any filter layer. Surprisingly, such a bypass channel does hardly compromise the cleaning effect of the filter module, at least as long as the filter layer has not yet been clogged with pollutants since in this case the biggest part of the air flow will take the major path through the filter layer due to lack of resistance. Only if the filter layer is clogged and if resistance for the air flow increases, air will obviously flow through the mentioned bypass channel.

Abstract: A filtration system for a gas turbine engine includes an inlet main body which defines an inner inlet fairing section and a bellmouth inlet faring section transverse thereto. An Engine Air Particle Separator (EAPS) is mounted adjacent to the inlet main body to define a plenum therein. A particulate laden airflow is filtered by the Engine Air Particle Separator (EAPS) to produce a substantially filtered airflow. The substantially filtered airflow is communicated into the plenum, through the bellmouth inlet faring section and into a gas turbine engine.

Abstract: Embodiments describe an arrangement for reducing the amount of LPA that reaches a NOx reducing apparatus such as a SCR system. The arrangement includes deflection elements, screens, means for dislodging any LPA that might become lodged in the screens, an aperture for removing the ash through, hoppers or collection means and an ash conveyance system. The arrangement is positioned in a region of ductwork with a reduced gas flow such as the SCR reactor. The screens are positioned relative to one another to direct the LPA downward toward an aperture for removal. In one embodiment the positioning of the screens creates a half-trough or inverted pyramid appearance when placed next to a vertical wall in the flue gas ductwork or the SCR reactor. The low point of the trough is in communication with the aperture allowing the LPA to exit the flue ductwork.

Abstract: The present scent distributor is a cartridge for attaching to a permeable substrate such as an air filter or humidifier pad. The cartridge housing is configured to hold the scenting media, said housing including a body and a cover; a plurality of openings in said housing to allow air to flow through at least a portion of said housing for interaction with the scenting media; a restrictor that slidingly engages with said housing to selectively restrict the flow of air through said housing; and an attachment device on said housing to attach said housing to a porous substrate.

Abstract: A serviceable gas/liquid separator is provided. The gas/liquid separator has a cross-section with one long axis and one short axis, with an aspect ratio of at least 1.3. A preferred cross-section, is an elliptical cross-section. Assemblies in which the separator unit can be used, are provided. In addition methods of use and construction are provided.

Abstract: A conventional dust-catcher for blast furnace gas comprises a pressure vessel, with a gas inlet and outlet dome (14), a separation chamber (16) and a lower dust hopper (18), and a diffuser pipe (26) extending axially through the gas inlet and outlet dome (14) into the separation chamber (16). To increase the separation efficiency of such a dust hopper (18), it is proposed to centrally arrange a flow deflecting chamber (50, 50?), having a smaller cross-section than the separation chamber (16), in the separation chamber (16), so that there remains an annular settlement chamber (52) between the inner wall of the separation chamber (16). The diffuser pipe (26) is connected to this flow deflecting chamber (50, 50?) so as to axially discharge a downward gas flow into the top end of the flow deflecting chamber (50, 50?), wherein this downward gas flow is deflected upward.

Abstract: A filter assembly having: an air filter; an air filter compartment having the air filter disposed therein; and a cap covering the air filter compartment. The cap has ribs disposed along inner sidewalls of the cap. The ribs, outer sidewalls of the compartment, and inner sidewalls of the cap form a plurality of channels having inlets for receiving a mixture of air and water. The walls of the channels collect droplets of a water portion of the mixture entering the channels. The collected water portion is removed from the filter assembly by gravity. The air filter compartment receives the air portion of the mixture exiting outlets of the channels. The exiting air portion received by the compartment passes through the air filter and after passing through the air filter passes out of the filter assembly.

Abstract: A conventional dust-catcher for blast furnace gas comprises a pressure vessel, with a gas inlet and outlet dome (14), a separation chamber (16) and a lower dust hopper (18), and a diffuser pipe (26) extending axially through the gas inlet and outlet dome (14) into the separation chamber (16). To increase the separation efficiency of such a dust hopper (18), it is proposed to centrally arrange a flow deflecting chamber (50, 50?), having a smaller cross-section than the separation chamber (16), in the separation chamber (16), so that there remains an annular settlement chamber (52) between the inner wall of the separation chamber (16). The diffuser pipe (26) is connected to this flow deflecting chamber (50, 50?) so as to axially discharge a downward gas flow into the top end of the flow deflecting chamber (50, 50?), wherein this downward gas flow is deflected upward.

Abstract: A filter element that includes a disk-shaped filter medium having an axially upstream surface, an axially downstream surface, and an outer peripheral surface extending axially therebetween. An embodiment of the filter medium has a radial inlet flow surface formed along the outer peripheral surface. Further, there is an inlet flow surface formed along the axially upstream surface, wherein a fluid is able to flow both radially and axially through the filter element.

Abstract: Separating a mixture comprising at least two solid materials comprises transporting the mixture into a plenum, introducing air into the plenum, removing a heavier fraction of the solid materials from the plenum, removing air having a lighter fraction of the solid materials entrained therein from the plenum, removing the lighter fraction of the solid materials from the air that is removed from the plenum, filtering the remaining air, and re-circulating the air back to the plenum. Valves at the locations where material is introduced to and removed from the system can prevent air flow therethrough while allowing the materials to pass. The air can be introduced into the plenum at an angle with respect to the pathway in which the heavier fraction of the materials falls through the plenum, thereby avoiding damage to a screen that diffuses the air being introduced into the plenum.

Abstract: A particulate material removing filter for exhaust gas from a diesel engine is provided. The particulate material removing filter is formed by laminating metal laths having an oxidation catalyst layer containing a noble metal that oxidizes nitrogen oxide in exhaust gas into nitrogen dioxide. The metal laths are laminated to form a laminate in such a manner that the drawing direction of the metal lath processing differs by 90 degrees with each other.

Abstract: A gas filtering device includes a housing (20,30), a flexible filter sheet (41), an inlet port (21), an outlet port (31), and a displacement restriction portion (41a) is provided. The flexible filter sheet (41) divides the interior of the housing into an inlet chamber and an outlet chamber. The filter sheet (41) has a portion that allows passage of gas. The inlet port is connected to the inlet chamber, and conducts gas into the inlet chamber. The outlet port is connected to the outlet chamber, and conducts gas from the inlet chamber to the/outlet chamber through the filter sheet. The outlet port has an opening close to the gas passing portion of the filter sheet. The displacement restricting portion (41a) restricts displacement of the gas passing portion toward the opening.

Abstract: A particle separator which broadly includes: an inner wall, an outer wall and a splitter, wherein the inner and outer walls define an air intake passageway, and wherein the splitter is positioned between the inner and outer walls so as to define a scavenge air flow passageway connected to the intake passageway and a main air flow passageway connected to the intake passageway; the inner wall having a humped-shaped portion between the intake passageway and the main air flow passageway; the humped-shaped portion having a peak and a radius of curvature at any point on the hump-shaped portion of the inner wall after the peak corresponding to a degree of curvature of from about 30 to about 60 degrees; and a boundary layer control mechanism for providing active boundary layer control along the inner wall after the peak and within the main air flow passageway. Also provided is a method for providing active boundary layer flow control along the inner wall after the peak and within the main air flow passageway.

Abstract: A filter housing structure adapted to a projector having a first encircled hook-and-loop fastening layer, a housing, a filtering layer, and a second encircled hook-and-loop fastening layer is provided. The first encircled hook-and-loop fastening layer is fixed on the casing of the projector and surrounds the openings arrayed on the casing. The housing has a central portion and a boundary portion. The central portion has a plurality of through holes thereon corresponding to the openings of the casing. The boundary portion surrounds the central portion and is corresponding to the first encircled hook-and-loop fastening layer. The filtering layer is assembled in the central portion and is disposed between the through holes and the openings for shielding the through holes. The second encircled hook-and-loop fastening layer is fixed on the boundary portion for fastening the housing to the first encircled hook-and-loop fastening layer.

Abstract: A particle separator for use in connection with a gas turbine engine is disclosed. The particle separator extends circumferentially less than 360 degrees between a first end and a second end. In one embodiment, an inner scavenge conduit is spaced radially inward from an outer scavenge conduit. An inlet can be located between the outer scavenge conduit and the inner scavenge conduit and adapted to receive airflow. A plurality of separated airflow paths can be located between the inner and outer scavenge conduits. The outer scavenge conduit and the inner scavenge conduit can be adapted to receive particles separated from the inlet airflow as the inlet airflow passes along the curved separating portion.

Abstract: The present disclosure provides for a device that can include a waste collector, a system that transports waste stream of particle matter from a housing, a system that transports a waste stream of effluent and particle matter from the housing, and a separator that receives the waste streams and collects the particle matter into the waste collector.

Abstract: An split filter drum includes a drum body to hold water, a drum lid coupled on an opening of the drum body, an air intake duct which runs through the drum lid and forms a curved discharge portion in the drum body to channel air discharged from a dust collection equipment into the water held in the drum body and enhance blending of dusts, odors, wooden chips and the like with the water, an air outlet located on the drum lid to discharge the air filtered by the water in the drum body, and a water barrier plate to separate the air outlet and an exit opening of the discharge portion. By filtering the air through the water smaller, dusts and odors in the air can be filtered out.

Abstract: A mat member includes inorganic fibers, a first main surface, a second main surface opposite to the first main surface, an edge surface surrounding the first main surface and the second main surface, and an inorganic fiber scattering reduction unit. The inorganic fiber scattering reduction unit is provided on at least a part of the edge surface of the mat member and configured to reduce scattering of the inorganic fibers.

Abstract: A filtration system for a particulate-laden stream of gas utilizes a group of fabric bags within the upper chamber of a housing as the means by which particulate matter is filtered out of the gas. The gas inlet into a lower chamber of the housing is provided with an inlet guide that directs the incoming gas against the lower side of a porous diffuser located below the group of bags and spanning at least most of the separation zone defined by the bags. Passages through the diffuser are configured to present an array of nozzles so that the gas is subjected to a pressure drop across the diffuser before flowing to the bags. The nozzle effect causes the particulate-laden gas to spread out evenly on the lower, upstream side of the diffuser and pass through the diffuser at substantially equal velocity at all passages, thereby smoothing the flow and distributing it evenly to all bags.

Abstract: An external filter box for a surface maintenance machine having a hopper with selective communication being provided between the filter box and the hopper to permit dusty air to flow from the hopper to the filter box and to permit dust and debris captured by the filter box to flow into the hopper. In one example, the hopper includes a prefilter assembly which is coupled to an inlet of the filter box during a sweeping operation and which is removed away from the filter box during a hopper dump procedure.

Abstract: The invention concerns a plant comprising a portion wherein the fluid path (I/O) is deflected and equipped with a distributor with, in series in the downstream direction (O), a first zone (5) with distribution passages (orifices 6) and a second zone (3), typically a grid or fine-mesh sieve forming diffusion passages, the first passages (6) having a total cross-section not exceeding 20% of the surface of the distributor and the second passages having a total cross-section more than 40% of the surface of the distributor. The invention is applicable to gas treatment by adsorption.

Abstract: A dust filter has adjustable sub-blades between blades. By adjusting the blades' distanced and the sub-blades positions and angles, stagnation area of filtration material on the blades are removed. Furthermore, space in the dust filter is fully used. Thus, a filtering efficiency is improved.

Abstract: A particle separator for separating particles and/or materials entrained in a flow of air is disclosed. The particle separator includes an annular inlet defined by an outer shroud and an inner shroud. An upper forward flow divider and a lower forward flow divider is disposed within the annular inlet. A first and second radially spaced annular flow divider is adapted for directing said flow of air into at least a first, second, third and fourth flow passageway. At least four curved flow splitters are utilized for separating particles and/or materials entrained in the flow of air as it passes through the first, second, third and fourth flow passageways.

Abstract: The present invention is embodied in a system for collecting biological samples from air including a collection assembly to store at least one biological sample and a separator to remove selected particles from the air prior to entry into the collection assembly. In one embodiment, the selected particles are magnetic and the separator includes at least one magnet to attract the particles from the air.

Abstract: An exhaust apparatus for a vehicle includes a spark arrester having a tubular spark arrester body assembled on a rear portion of a muffler connected to an exhaust pipe. A tail pipe is inserted in the spark arrester body and is mounted on the spark arrester such that exhaust gas flowing through the muffler is discharged into the atmospheric air from the tail pipe through the spark arrester, to carry out, expansion and contraction of exhaust gas in the spark arrester occurs to augment the sound reduction performance. An annular partition plate cooperates with an inner face of a spark arrester body to form a throttle path therebetween that is securely mounted on a tail pipe wherein a plurality of expansion chambers that communicate with each other through the throttle path are formed between the tail pipe and the spark arrester body with the annular partition plate disposed therebetween.

Abstract: The filter system for filtering particulate material from a generally unidirectional fluid stream comprising a first filter removably positioned in the fluid stream and a second filter removably positioned in the fluid stream downstream of the first filter. The first filter comprises a pre-filter and includes a layer of fluid-permeable material having a plurality of spaced-apart openings extending completely therethrough. The method of utilizing the fluid filter system of this invention is also disclosed and comprises the steps of: (1) removably positioning a first filter in the fluid stream; and (2) removably positioning a fluid-permeable second filter in the fluid stream downstream of the first filter. The first filter may be removed from the fluid when it becomes restrictive to air flow. The system may be operated so that the air may be passed through the second filter until the second filter becomes clogged or restrictive to air flow.

Abstract: A hatch cover adapted to be positioned over and close a hatch opening on a railroad hopper car. The hatch cover includes a rigid panel sized to cover the hopper car hatch opening. The panel for the hatch cover includes an inner skin, an outer skin, and a core material sandwiched between and adhered to the inner and outer skins. Edge structure is secured to the panel for protecting edges of the panel.

Abstract: A particle trap, such as in a honeycomb body, for separating particles out of an exhaust gas flow, includes a flow channel. An exhaust gas flow which includes particles flows through the flow channel. Internals, such as projections, humps, protuberances or the like are situated on one side of the flow channel. An opposite region of a channel wall is completely or partially porous. When a flow of exhaust gas which includes particles flows through the particle trap, the particles are diverted toward the porous channel wall, to which they adhere. They can then be removed again by regeneration. The particle trap and an associated process for separating particles out of an exhaust gas flow, are particularly advantageous when used in the exhaust system of an internal-combustion engine, in particular a diesel engine, specifically and advantageously in combination with a soot filter.

Abstract: A system for monitoring a percentage of filter life remaining of a filter assembly of filter-fan devices. The system uses a single thermistor that is operated in two separate modes for monitoring the filter assembly. The thermistor is positioned in the airflow of the filter-fan adjacent to the air outlet. A first current is applied to the thermistor for determining the temperature of the airflow from a first thermistor voltage. The first thermistor voltage is responsive to the first current applied to the thermistor. A second current that is greater than the first current is applied to the heat the thermistor. The temperature of the thermistor is determined from a second thermistor voltage which is responsive to the second current applied to the thermistor. The percentage of filter life remaining of the filter assembly is determined from the temperature of the airflow and the second thermistor voltage.

Abstract: Constantly high efficiency of a catalytic converter can only be ensured when the configuration is maintained relatively free of particulate matter. A screen is disposed on the inflow side of the catalytic converter, which continuously or discontinuously transports away the flue dust particles collected by the screen. The flue dust collected is transported by the lateral movement of the screen to one side of the catalytic converter where the collected dust is removed. Alternatively or additionally, a vacuum system may be employed to clean the screen.

Abstract: A particle separation member is provided for use with a cyclone separator. The particle separation member divides the separator into a cyclone chamber and a particle receiving chamber. The cyclone chamber and the particle receiving chamber communicate via a plurality of apertures in the particle separation member. The separation member comprises two cooperating members movable between an open position and a closed position to provide access to the particle receiving chamber to empty the collected contents therefrom.

Abstract: A particle separation member is provided for use with a cyclone separator. The particle separation member divides the separator into a cyclone chamber and a particle receiving chamber. The cyclone chamber and the particle receiving chamber communicate via a plurality of apertures in the particle separation member. The apertures have baffle members for reducing the flow of fluid in the particle receiving chamber.

Abstract: A procedure and a filter device (1) serving the purpose of removing and/or destruction organic substances in contaminated air. The filter device comprises at least one ventilator (12) for sending an air stream through a first chamber (14) with an opening, which is connected with a source for contaminated air; a second chamber (15) with a number of sheets (20) placed abeam the main direction of the air stream in order to make the air stream change direction at least one time; a third chamber (16) with a number of perforated tubes (22) which at least at one end are in open connection to a secondary air source; a fourth chamber with a number of lamps for radiating the air stream with a short-waved ultra-violet light and; a fifth chamber (17) with a volume, which gives the air stream a predetermined duration time in the chamber, and which has an opening, through which the purified air passes in order to be released to the surroundings.

Abstract: A high efficiency compact gas-particulate separator is provided comprising: a bag filter disposed above and a cyclone disposed below,the bag filter including: a casing, a compressed air header into the casing; a diaphragm valve on the header; a blow tube connected to the header; a venturi for accelerating an ejected jet of compressed air from the blow tube and for inducing an inflow of secondary air; and a filter bag for collecting dusts mounted in the casing; the casing having a clean air outlet, andthe cyclone including: a dust-laden gas inlet; an outer cylinder for generating a centrifugal force, the cylinder being connected to the casing; an inner tube for letting a dust-laden gas pass from below upward into the casing; and a dust hopper for storing dust particles captured by centrifugal forces and dislodged dust cakes removed from the filter bag by cleaning.

Abstract: A fenestrated centrifugal terminator is described for use in an internally circulating fluid bed reactor or conventional riser reactor. It includes a tubular member having a straight vertical tubular portion the lower end of which is adapted for attachment to the upper end of a riser tube. The upper end of the vertical tubular portion merges into a substantially semi-circular inverted U-shaped tubular loop and terminating in a downwardly directing opening. A ramp portion of shallow angle is provided in the vertical tubular portion adjacent the inner face of the loop and terminating at the inlet to the loop to thereby create a venturi. Commencing at the end of the ramp portion is a semi-circular divider wall dividing the tubular loop into a larger upper flow channel and a smaller lower flow channel. This divider wall has a plurality of longitudinally spaced lateral slots through which the gas being separated from the solids is discharged.

Abstract: Known drips for gas transmission pipelines do not work effectively for two phase liquid-gas flows. Disclosed is a drip having two parts; a flow separator and a receptacle. The flow separator comprises a pipe having circumferential apertures in the wall. Surrounding the pipe and the apertures is a shell that defines an annular passage between the pipe wall and the shell. Annular gas liquid flow entering the separator will be divided. Most of the gas will pass the apertures and continue through the pipe. Most if not all of the liquid and some gas will pass through the aperture. It is then passed to a receptacle where the fluid is removed. The secondary gas flow is then either recombined with the main flow or can be diverted to a secondary system. Periodically the liquid collected in the receptacle can be emptied.

Abstract: An exhaust fume purifying device includes a separator for receiving exhaust fumes and cooling water from the engine of a vehicle to mix the exhaust fumes and water so as to dissolve the toxic component of the exhaust fumes and allow cleaned gas separated from liquid to be exhausted. The water drips through two perforated partitions in the separator to a lower half of the separator to flow into a water filter tank for being cleaned and is then pumped back to a water tank of the engine.

Abstract: A shielding vent for an electromagnetic interference shielded enclosure having an electrically conducting wall shield includes a mounting plate or flange through which extends a vent pipe with an internal septum plate or divider extending axially along at least a portion of the inner length of the vent pipe. The mounting flange is secured to a wall of the shielded enclosure over an opening in the wall and to the wall shield to insure that the integrity of the shielding for the enclosure is maintained. With the mounting flange so mounted on the wall of the enclosure, the vent pipe extends through the opening in the wall of the enclosure and provides fluid communication between an internal region of the enclosure and a region external of the enclosure. The septum plate has a cross section in the shape of a cross so that at least a portion of the length of the cylindrically shaped vent pipe is subdivided into four parallel, axially extending equal fluid flow sections.

Abstract: A multilayer filter pack includes at least three adjacent layers of fibrous material, each of which is permanently electrically charged and not more than 10 mm thick. The upstream and middle layers are formed from fibers having a fiber diameter that decreases from layer to layer in the direction of flow and are arranged at a packing density that increases from layer to layer in the direction of flow. The third layer has a fiber diameter and packing density that is approximately equal to the fiber diameter and packing density of the first layer. The multilayer filter pack is particularly well suited for use in air-purifying systems and breath protection filters.

Abstract: A procedure and a filter device (1) serving the purpose of removing and/or destruction organic substances in contaminated air. The filter device comprises at least one ventilator (12) for sending an air stream through a first chamber (14) with an opening, which is connected with a source for contaminated air; a second chamber (15) with a number of sheets (20) placed abeam the main direction of the air stream in order to make the air stream change direction at least one time; a third chamber (16) with a number of perforated tubes (22) which at least at one end are in open connection to a secondary air source; a fourth chamber with a number of lamps for radiating the air stream with a short-waved ultra-violet light and; a fifth chamber (17) with a volume, which gives the air stream a predetermined duration time in the chamber, and which has an opening, through which the purified air passes in order to be released to the surroundings.