Abstract: An air-dryer cartridge for a compressed air preparation system of a utility vehicle includes a drying agent container having a first housing part and a second housing part movable relative to each other, a cartridge housing for holding the drying agent container, and a helical spring is arranged to preload the second housing part in a direction to reduce a volume of the drying agent container. The helical spring has multiple coils, including a first outer coil at a first end of the helical spring and a second outer coil at a second end of the helical spring. At least one of the first and second outer coils has a greater diameter than inner coils of the helical spring between the first and the second end of the helical spring.

Abstract: An emissions device for use with a container assembly with a vent opening is provided. The emissions device includes a housing configured to be mounted to the container. The housing includes a backing plate that has at least one opening. A membrane is supported by the backing plate and extends over the opening. The membrane is configured to allow passage of vapor and prevent passage of liquid. A filter is located within the housing such that vapor that passes from the at least one opening through the membrane then passes through the filter. At least one spring is positioned within the housing and is configured to compress the filter.

Abstract: A filter unit for use in a filter box assembly, the filter unit comprising a particulate filter layer and a gas filter layer, the particulate filter layer being configured to bias towards the gas filter layer, exerting pressure thereon. There is also described filter box assemblies (including a duel filter assembly) comprising the filter unit, and a respiratory protective device comprising the filter unit. Also described is a method of manufacturing a filter unit with a gas filter layer and a particulate filter layer, wherein a force is applied to the particulate filter layer causing it to fix the gas filter layer in place. Also described is a method of manufacturing a dual filter assembly wherein a casing is twice reversibly attached to and detached from a support surface, filter units being added to the casing when the casing is attached to the surface.

Abstract: A method includes using an element which includes a monoblock concrete body with a volume greater than 1 L and a surface porosity greater than 8%, which body includes in the body and/or on a surface thereof a compound having a BET specific surface greater than 100 m2/g, and which element does not include a photocatalytic agent, to absorb from the atmosphere a gas selected from the group consisting of nitrogen oxides, carbon oxides, sulphur oxides, and ozone, or a volatile organic compound.

Abstract: A gas-particulate filter canister includes a filter canister body and first and second canister end caps secured to opposing ends of the filter canister body. First and second filter cartridges are supported within the filter canister body for filtering a gas in series. The filter cartridges can be standalone units which are built independently and are installed into the filter canister body. The filter cartridges can be concentrically arranged and can include a particulate filter cartridge and a gas filter cartridge.

Abstract: A system for a vehicle is provided herein. The system includes a fuel vapor canister comprising a shell, a compression plate within the shell and an end cap. The end cap includes a double sided spring interface and a double sided shell sealing surface having double sided identical grooves, only one of which is sealed to the shell. The system further includes a spring coupled to the compression plate and only one spring interface.

Abstract: An oil suppressing structure in an air drying device for removing oil which rises in an interior of the air drying device used in a vehicle compressed air brake system includes an outer case 21, a drying case 22 in an interior of the outer case 21, a base plate 23 fixed to a lower end portion 21a of the outer case 21, and an outer cover 24 fixed to a lower end portion 21a of the base plate 23. The drying case 22 has a large-diameter long cylindrical body portion 22A and a small-diameter long cylindrical body portion 22B. A particulate desiccating agent 25 is filled in an interior of the large-diameter cylindrical body portion 22A. An oil adsorbing material 27 is inserted in a space S3 between an inner wall of the outer case 21 and the small-diameter long cylindrical body portion 22B of the drying case 22.

Abstract: A canister for trapping a fuel vapor vaporized in a fuel tank has a casing defining an adsorption chamber therein, an adsorbent capable of adsorbing the fuel vapor and filled in the adsorption chamber and a flow regulation plate disposed in the casing. The casing has a fuel introducing port configured to introduce the fuel vapor from the fuel tank into the adsorption chamber, and an air communicating port communicating the adsorption chamber with the atmosphere. The air communicating port is formed on a side surface of the casing extending in a direction of gravitational force. The flow regulation plate disposed at an end of the adsorption chamber near the air communicating port and has an opening configured to communicate the adsorption chamber with the air communicating port. The opening is positioned above the air communicating port in the direction of gravitational force.

Abstract: To connect and disconnect a filter in a gas flow system, a filter unit has a filter housing wherein an adsorption/absorption filter is movably arranged. The filter housing has two tube connectors for connecting the filter unit in a gas conducting passage. The filter unit also has a shifting element which is movable from a first to at least a second position. The first position allows the filter to substantially fill the gas conducting passage in a way that forces the gas in the gas flow system to pass through the filter, whereas the second position substantially removes the filter from the gas conducting passage, allowing the gas to pass through the filter unit without passing the filter.

Abstract: The invention relates to an air filter device (1) having a filter housing comprising a filter housing cup (2) and a filter housing cover, in which filter housing at least one filter element (3) is arranged. Pertinent to the invention is that a flow-directing element (7) is provided that is configured in such a manner that it is ensured that the filter element (3) is flowed through uniformly.

Abstract: A jacket material into which a gas adsorbing device and core material are inserted is decompressed in a vacuum chamber, the opening is sealed, and then the jacket material is exposed to the atmosphere. In the atmospheric pressure, a pressure of about 1 atm which is equivalent to the pressure difference between the inside and outside is applied to the jacket material of the heat insulator. The jacket material is made of a plastic laminated film and is deformed by pressure. A protruding portion is plunged into a container to drill through holes, and a gas adsorbent in the container communicates with the inside of the jacket material. Thus, both during holding and in applying to the vacuum heat insulator, the gas adsorbent can be applied to the vacuum heat insulator without degradation, and the high degree of vacuum can be kept for a long time.

Abstract: A fuel vapor adsorbing device has a casing having an axis and defining a vapor inlet, a vent connected to the outside environment, and a chamber connected fluidically to the inlet and the vent. The adsorbing device also includes a filter material housed in the chamber; a cover wall covering the chamber; and an elastic mechanism and, preferably, a grille, which are integral with the cover wall and cooperate with the filter material.

Abstract: A gas recovery system for a beverage dispensing system, the gas recovery system comprising: means for drawing gas from an at least partially used beverage container, a compressor downstream of said at least partially used beverage container; a gas separator downstream of said compressor, a gas storage vessel downstream of said gas separator; wherein in use the gas recovery system is configured to draw gas from the at least partially used beverage container and to separate said gas into component gases by passing said gas through said gas separator, and to selectively direct at least one of the separated component gases to said gas storage vessel.

Abstract: A high performance flatus gas filter assembly, and a body waste collection pouch with which it may be used, along with a method for making such an assembly, are disclosed. The assembly includes a filter pad having first and second layers of deodorizing filter media with an imperforate gas and odor barrier layer sandwiched therebetween for blocking the direct flow of gases between the opposing inner faces of the filter layers. An envelope of liquid and gas impermeable material defines a chamber for enclosing the pad. The envelope has walls with first and second openings communicating with central portions of the first and second filter layers, and defines a peripheral space about the pad to permit the outward flow of flatus gases from the peripheral edge surface of one of the filter layers inwardly into the peripheral edge surface of the other of the filter layers.

Abstract: The invention concerns a desiccant box for dehumidifying air, with a cylindrical outer housing (10), a lid (11) that closes the outer housing, and an inner housing (12) to accommodate desiccant (13). The lid (11) features at least one inflow opening (14) and at least one outflow opening (15), the contour of the outer housing opposite the lid being curved. Moreover, another inner housing (17) is provided which is located in the area of the contour (16) and runs approximately along this contour, this inner housing being also filled with desiccant (18), and the two inner housings (12 and 17) being connected to each other.

Abstract: Disclosed is a fuel filter for removing sulfur containing compounds from an internal combustion fuel stream. In one embodiment, the fuel filter comprises at least one column comprising an adsorbent. In one exemplary embodiment the adsorbent is capable of removing sulfur containing compounds, especially sulfur containing aromatic compounds, from fuels used in internal combustion engines, especially diesel fuels. Also disclosed is an apparatus for extending the life cycle of a post combustion emission control device. In one exemplary embodiment, the apparatus comprises a fuel filter for removing sulfur containing compounds from an internal combustion fuel stream and an emission control device. Finally, a method for removing sulfur containing compounds from an internal combustion fuel stream is disclosed.

Abstract: An electronic controller (16) controls the operation of an electrochemical oxygen generating system (14) producing a desired gas. The product gas is fed to a storage unit (12) or a regulator (28) and pulsing valve (28) controlling the gas flow to a user. A two-stage system (180) combines a low pressure 100 and a high pressure (150) gas generating subsystems. The low pressure subsystem (100) uses IMAT's (106) to pump oxygen from ambient air to generate a low-pressure. The high pressure subsystem (150) uses IMAT's (160) to pump oxygen to high-pressure oxygen storage devices (194).

Abstract: A compressed air supply device is provided for a utility or commercial vehicle. The device includes a valve housing and an air dryer cartridge which has a housing. A drying agent box, which is filled with drying agent, is arranged in the housing of the air dryer cartridge. The drying agent can be compressed by an elastic device.

Abstract: An air dryer, used in a compressed air system, includes an oil coalescing element for agglomerating oil in compressed air passing through the oil coalescing element in a first direction during a charging cycle and passing through the oil coalescing element in a second direction during a purging cycle. A drying material, which is downstream of the oil coalescing element during the charging cycle and upstream of the oil coalescing element during the purging cycle, reduces moisture in the compressed air during the charging cycle.

Abstract: An air cleaner for an engine that includes a fuel tank and an air-fuel mixing device. The air cleaner includes a housing that defines an internal filter space and a canister at least partially formed as part of the housing. The canister is substantially non-permeable to fuel vapor. A first aperture provides fluid communication between the fuel tank and the canister and a second aperture provides fluid communication between the canister and the air-fuel mixing device.

Abstract: Filter apparatus for extracting water vapors from a gas includes a housing and a cartridge containing desiccant disposed in the housing. A spring biased follower in the cartridge exerts continuous compressive forces on the desiccant.

Abstract: An odor adsorbing or deodorizing filter which comprises a matrix or substrate impregnated with a mixture of particulate chemically modified activated carbon and particulate activated carbon, together with a binder. The filter may be incorporated into an ostomy collection bag, wound dressing, respirator, air conditioning unit or the like.

Abstract: An apparatus for separating a first gas from a mixture of the first gas and at least one second gas comprises a housing having an inlet port and an outlet port and an adsorbent which is positioned in the housing. The adsorbent comprising a carbon based foam monolith that has an affinity for the first gas. Thus, as the gas mixture flows through the housing, the first gas will be adsorbed onto the adsorbent and the second gas will exit the housing through the outlet port. In this manner, the first gas is separated from the second gas.

Abstract: An expandable desiccant element for removal of moisture from an air stream. Such expandable desiccant element includes at least one first expandable containment section capable of expanding a first predetermined amount, at least one second expandable containment section capable of expanding a second predetermined amount which is greater than the first predetermined amount connected to the first expandable containment section. Such at least one first expandable containment section and at least one second expandable containment section forming a predetermined shape.

Abstract: A fuel vapor storage canister is provided. The canister includes a vapor storage chamber of variable volume, a partition, vapor adsorbing material, and a volume compensator. The partition is movable within the canister and partially defines the vapor storage chamber. The vapor adsorbing material is located in the vapor storage chamber. The volume compensator includes a spring having at least three legs that are deflected by and exert pressure against the movable partition to control the volume of the vapor storage chamber. In one embodiment, the legs of the spring may be evenly spaced to exert a balanced pressure. The spring may include two pairs of opposing legs, where the spring rate between the pairs of legs may vary. The spring may be comprised of two angularly offset band springs and may be formed from a unitary member.

Abstract: An air dryer assembly for removing moisture and oil from a compressed air system includes a desiccant material received in a shell for adsorbing moisture as compressed air passes therethrough. A coalescing element is disposed between an inlet and outlet for removing oil aerosols from the compressed air. A check valve is disposed in parallel with the coalescing element and forces the compressed air to pass through the coalescing element as air flows from the inlet to the outlet. During a purge or reverse flow, compressed air bypasses the coalescing element and removes oil collected in the cartridge through the inlet.

Abstract: Disclosed is a canister for a motor vehicle. A liquid trap provided to an upper surface of a canister body is formed to have a circular configuration. A plurality of intake pipe nozzles are connected at an angle to a guide pipe which is installed through a center portion of the liquid trap, such that the intake pipe nozzles extending in a radial direction are separated one from another by a predetermined angle along a circumferential direction. A bottom wall of the liquid trap is formed such that an upper surface of the bottom wall is inclined downward from a center portion thereof toward an edge portion thereof. A diffusion device is disposed directly below the liquid trap to uniformly distribute evaporated gas to be introduced into the canister body.

Abstract: A pressure swing adsorption (PSA) system including a first group of PSA modules having a plurality of first PSA modules, and a second group of PSA modules having a plurality of second PSA modules. The system includes a feed gas manifold, a product manifold, and a waste manifold connected to the first PSA modules and the second PSA modules. Each first PSA module operates on a first PSA cycle in synchronization with the other first PSA modules, and each second PSA module operates on a second PSA cycle in synchronization with the other second PSA modules. The first PSA cycle is offset from the second PSA cycle. The PSA modules include a plurality of pressurized adsorbent chambers, an inlet manifold, and an outlet manifold. A rigid structure is provided that connects the inlet manifold to the outlet manifold, and structurally joins the inlet and outlet manifolds to the adsorbent chambers.

Abstract: A storage apparatus has a container having an inlet, an outlet and a regeneration air opening. Active carbon is provided as the storage medium in the container. Furthermore, a monolith is disposed in the container.

Abstract: A concentrating chamber in an oxygen concentrating apparatus is provided, in which a process for adsorbing nitrogen to concentrate oxygen is performed in a single case. The concentrating chamber in an oxygen concentrating apparatus includes: a casing having upper and lower openings; an adsorption unit for performing an oxygen concentration through a compressed air and counter-flowing the stored oxygen to perform a nitrogen rinsing in the casing; a check valve operating according to a predetermined pressure, for supplying the oxygen concentrated in the adsorption unit and rinsing the nitrogen adsorbed in the adsorption unit; and upper and lower manifolds for supplying the concentrated oxygen through the upper and lower ends of the casing, or supplying the compressed air and simultaneously exhausting the rinsed nitrogen, through the upper and lower ends of the casing. The concentrating chamber in an oxygen concentrating apparatus includes at least two casings.

Abstract: An air dryer assembly for removing moisture and oil from a compressed air system includes a desiccant material received in a shell for adsorbing moisture as compressed air passes therethrough. A coalescing element is disposed between an inlet and outlet for removing oil aerosols from the compressed air. A check valve is disposed in parallel with the coalescing element and forces the compressed air to pass through the coalescing element as air flows from the inlet to the outlet. During a purge or reverse flow, compressed air bypasses the coalescing element and removes oil collected in the cartridge through the inlet.

Abstract: In an activated carbon filter for reducing vapor emissions from a fuel supply system including, in a filter housing, a first connecting section for communication with the atmosphere and a second connecting section for communication with the fuel supply system, an activated carbon filter section is disposed between the first and second connecting sections and a filter layer of a highly adsorptive filler material layer is disposed between the activated carbon filter section and the first connecting section to prevent any escape of vapors through the first connecting section to the atmosphere.

Abstract: An adsorption bed arrangement includes a plurality of adsorption elements, a housing, and a gasket member. Each of the adsorption elements has a first adsorptive media and a second adsorptive media contained within a respective element. The first and second adsorptive medias remove different contaminants from the incoming air stream. For example, the first adsorptive media removes acidic contaminants and the second adsorptive media removes basic contaminants. Each of the adsorption elements is selectively openable to provide access to the adsorptive medias. The housing defines an interior, a plurality of inlet openings, and a plurality of outlet openings. The adsorption elements are positioned within the housing interior and the housing is selectively openable to provide access to the adsorption elements. The gasket member is between the housing and the adsorption elements.

Abstract: The invention provides a solid filter body for a filter unit, including a sintered composition of adsorbing materials containing activated carbon having a particle size in the range of from 4 to 100 mesh, and a binder in the form of thermoplastic powder having a particle size in the range of from 10 to 250 mesh, the ratio of binder to adsorbent being less than 25% by weight, and the composition being sintered at a temperature below 250° C. The invention further provides a fluid filter unit including a casing having inlet and outlet openings housing the solid filter body and a method for manufacturing the solid filter body.

Abstract: A filtering device for treating substances passing therethrough includes a filter cartridge having a cylindrical inner wall surrounded by a cylindrical outer wall. The inner and outer walls are spaced to define an annular space between them. A filtering media occupies the annular space and operates to remove contamination from a fluid flowing through the filter cartridge. First and second covers are located at opposite axial ends of the filter cartridge for sealing the system. At least one biasing assembly is disposed at one axial end of the filter cartridge for applying an approximately constant compression force to the filter medium. The compression force minimizes the formation of voids and the occurrence of bridging within the filtering media. A sensing mechanism, such as a Hall Effect sensor, can be applied to the filter cartridge for detecting changes in the filtering media which indicate the formation of voids or defects in the filtering media.

Abstract: An axial flow adsorber apparatus includes a bed of adsorbent material, a barrier in the form of an open-cell material combined with a distribution screen or baffle, graded balls, and an inflatable bladder. The adsorbent bed is the active adsorbent required for a separation process. The barrier combines the open-cell material, which provides uniform retention of all adsorbent material, with the distribution screen, which provides uniform flow and pressure distribution across the bed. The barrier substantially covers a top surface of the adsorbent bed to prevent fluidization of the bed. Graded balls on the barrier uniformly distribute a downward pressure supplied by the inflatable bladder above the balls. The uniform pressure is transmitted through the balls to the barrier to further suppress fluidization. The balls also serve to direct gas flow in the upper end of the vessel and reduce void volume in the apparatus that would trap product gas.

Abstract: An adsorbent unit assembly including a holder, an elongated member on the holder, an enlarged portion at the end of the elongated member, a cylindrical adsorbent unit having an opening therein for receiving the elongated member, and a grid mounted on the elongated member on the opposite side of the adsorbent unit from the enlarged portion. The foregoing adsorbent unit assembly is mounted within the housing of a receiver dryer by compressing one or more adsorbent units on the elongated member between the grid and the enlarged portion so as to cause the outer sides of the adsorbent units to bear against the inside surface of the housing while the grid also provides an interference fit with the housing.

Abstract: The present invention provides a method and apparatus to purify various gases utilizing the superior performance a heated getter process in a smaller package than previous multiple stage, heated getter processes. The smaller package includes inner and outer enclosures, and an integral, regenerative heat exchanger to simultaneously increase heater efficiency and cool the purified gas. The invention also includes a particle filter to remove particles from the gas flow. The invention further provides an interface to various modular gas stick substrate designs with an inlet and an outlet in one end of the integrated heated getter purifier system. The inlet gas is preheated by the integral heat exchanger and then heated to operating temperature of 200-400° C. The heated getter removes various impurities from the gas. The heated gas is then cooled in the integral heat exchanger. The cooled gas is exposed to a second quantity of cooler getter to remove residual impurities.

Abstract: An advantageous configuration of an adsorption medium in a drying plant is described. At least one cartridge containing the adsorption medium for a gas to be dried is removably disposed in a container of the drying plant. A pressure prevails between the adsorption medium and the cartridge such that the adsorption medium remains stationary in the cartridge, in particular even under changing operating and/or environmental conditions. Using the cartridge enables the adsorption medium to be changed rapidly and safely on site. In addition, the invention ensures a high quality of gas drying, in particular without the added risk of the particles being released. Different cartridges can also be used for different adsorption media and can therefore be optimized to suit the most varied of drying plants.

Abstract: This invention relates to automotive evaporative emissions canisters. Such structures of this type employ a carbon-filled foam which adds adsorptive performance to the canister without having to enlarge the canister or having to change the carbon in the canister to a higher performance carbon.

Abstract: Process and apparatus for the purification of a gaseous flow containing at least one impurity which can be carbon dioxide, water vapor and/or hydrocarbon. The impurity is adsorbed on a bed of adsorbent containing at least one adsorbent material, it being possible to use stacked adsorbent beds. Atop the uppermost bed is a layer of particulate ballast having a density greater than that of the adsorbent. The bed of ballast exerts a mechanical pressure on the subjacent adsorbent and prevents fluidization of the upper portion of the subjacent adsorbent. As a result, the rate of gas flow through the adsorbent can be increased.

Abstract: An adsorption bed arrangement includes a plurality of adsorption elements, a housing, and a gasket member. Each of the adsorption elements has adsorption media contained within a respective element. Each of the adsorption elements are selectively openable to provide access to the adsorption media. The housing defines an interior, a plurality of inlet openings, and a plurality of outlet openings. The plurality of adsorption elements are positioned within the housing interior. The housing is selectively openable to provide access to the plurality of adsorption elements. The gasket member is between the housing and the adsorption elements. A method for changing filtering media in an adsorption apparatus includes steps of removing an access panel from an adsorption bed housing to expose a cover member covering an end of an adsorption element; removing the cover member from the end of the adsorption element to expose filtering media within the element; and pouring the filtering media from the element.

Abstract: A receiver/dryer includes a canister with a cylindrical sidewall, an integral lower end, and an open upper end. A pick-up tube is disposed centrally within the canister. The lower end of the pick-up tube has a wedged-shape and is supported by the lower end of the canister. The upper end of the pick-up tube has an annular groove that carries an O-ring seal. A lower baffle and lower filter pad are received over the pick-up tube with the lower baffle having a tight slip-fit therewith. Loose desiccant is supported by the lower baffle and filter pad. An upper filter pad and upper baffle are received over the pick-up tube, with the upper baffle having a slip-fit therewith. An upper end cap is secured to the open end of the canister, with the pick-up tube being received within an outlet passage in the upper end cap, and the O-ring seal providing a fluid-tight seal between the pick-up tube and the end cap.

Abstract: In a reforming reactor suitable particularly for the water vapor reforming of methanol in mobile applications such as vehicles, a reaction space is filled with a catalyst pellet fill and has a movable reaction space wall which exerts a position-fixing pressure onto the catalyst pellet fill. According to the invention, a filling device is provided through which catalyst material can be filled from the outside into the reaction space through a passage opening formed in one of the reaction space walls.

Abstract: A filter/drier for receiving and discharging a flow of refrigerant having a header with an inlet passage forming a plenum and an outlet passage through the header. A louvered baffle plate has peripheral tabs crimped over an annular flange on the header to form a subassembly. A cup-shaped shell containing desiccant, with a layer of fibrous filter material over the desiccant, is assembled over the header subassembly and sealed to the header by weldment. The peripheral spaces between the crimped baffle tabs provide exclusive flow dispersion to an annular collector space in the header which communicates with the outlet passage.

Abstract: Described are preferred vapor recovery canisters which are useful in on-board vehicle fuel vapor recovery systems. The preferred canisters incorporate thermal management of solid adsorbent with phase change materials to improve both adsorptive and desorptive capacity of the canisters. Also described are preferred encapsulation members for use in the vapor recovery canisters.

Abstract: A drying cartridge for air drying systems, especially for compressed-air brake systems of vehicles, has an inner pot and an outer pot. The components used for the air drying, including a pressure spring used for compressing the drying agent, are arranged inside the inner pot constructed as a preassembled unit, in which case the inner pot can be inserted flush into the outer pot. By usage of an interior-cylindrical wall, the inner pot surrounds a duct which penetrates the drying cartridge in the axial center, through which duct a screw is guided for fastening the drying cartridge on the dryer casing.

Abstract: In a drying cartridge for air drying installations, especially for vehicle air-brake systems, an air drying agent is contained inside an outer pot, the base region of which can be closed off by a face cover. A central screw with a thread at its end passing through the face cover and securable to the dryer casing extends axially and centrally through the drying cartridge. The face cover, which may be made of thin plastic, can move to a limited extent in relation to the outer pot of the drying cartridge and is secured by clamping or friction to an O-ring which in turn is introduced into an annular groove in the central screw such that, after the drying cartridge has been released from the dryer casing, the cartridge can still be handled as a structural unit.

Abstract: A desiccant canister assembly for use in an air dryer system includes a pair of concentrically disposed casings, top and bottom end caps, top and bottom porous plates and moisture absorbing material. A cylindrical opening is defined in between the casings. The top end cap affixes to the upper ends of the casings. The bottom end cap affixes to the lower ends of the casings. Each end cap features openings that allow air to flow through the cylindrical opening. The bottom porous plate is situated at a bottom of the cylindrical opening against the bottom cap. The top porous plate is slidably disposed within the cylindrical opening near the upper ends of the casings. The absorbing material is disposed within the cylindrical opening between the porous plates. The desiccant assembly also includes a mechanism for compacting the absorbing material between the porous plates.

Abstract: A canister includes a partition wall which extends toward the lid member with one end thereof connected to the end wall and opposite sides are connected to an inner surface of the casing body. First and second adsorbent layers, formed by an adsorbent, are retained between first and second filters and a third filter, respectively. The first and second filters are fixedly disposed on opposite sides of the partition wall to define first and second chambers between the first and second filters and the end wall, respectively. The third filter is placed and carried on an inner surface of a support plate which is fitted in the casing body and which has a large number of communication bores. The support plate and a lid member are biased by a spring in a direction to compress the first and second adsorbent layers.