Abstract: An industrial baghouse having a single clean air plenum in which a portion of the filter bags can be serviced while the baghouse remains on line. Service compartments in the clean air plenum can be individually isolated from the remainder of the clean air plenum by installing removable slide gates through normally sealed slots formed in the top of the baghouse. When a service compartment has been enclosed by the gates, it is isolated from the clean air plenum and access doors above the compartment can be removed to provide access for on line inspection and servicing of the filter bags and related components. Removable gaskets which normally seal the slots can be removed prior to insertion of the gates and replaced following removal of the gates.

Abstract: A roof-mounted electrostatic air cleaner for connection to an exhaust duct has a sectionalized cabinet with detachably connected, directable inlet and outlet sections and an intermediate precipitator section, a traveling manifold with multiple spray nozzles is arranged to wash the outer surfaces of precipitator cell end plates as well as both surfaces of intermediate collector plates, and a construction and arrangement of large capacity precipitator cells provides for their convenient and safe assembly and removal from the cabinet.

Abstract: In an air circulatory system (10) of the cab (11) of an earthmoving vehicle it is desirable to have a source of ambient fresh air (A) combined with existing cab air (R) flowing through the air conditioning unit (22). It is common practice to pass both sources of air through one filter which adversely affects the effectiveness of the air conditioning unit 22. When separate filters are provided for each source of air, however, serviceability has often been sacrificed by having the filters placed in a location that is not easily accessible. The air circulatory system (10) of this invention overcomes these problems by providing two filters (30,32) which are cooperatively mounted within an assembly 28 that directs the first ambient source of air A through both filters (30,32) while providing a chamber (90) which mixes the cabin air (R) with the ambient and directs the combined air only through the second filter (32).

Abstract: A filter assembly in an air cleaner includes a lower wire-form adapted to receive two opposite ends of a pliable filter material. Spaced wires on the lower wire-form enable manual forming of pleats in the filter material and define the tops of such pleats. A complementary upper wire-form is engageable with the lower wire-form and attached filter to define the bottoms of such pleats.

Abstract: A cooking unit having a hood equipped with air cleaning structures and blowers for moving air through the cleaning structures. The air cleaning structures include a pre-filter having spaced baffles for collecting air borne greases and particles. A primary fiber filter and secondary charcoal and oxidizer beds are located downstream of the pre-filter. A high efficiency filter is located downstream of the secondary cleaning beds. A damper behind the pre-filter closes in response to an increase in temperature of the air moving through the filters. A separate heating unit is used to reactivate the charcoal.

Abstract: A gas dust-removing or dedusting filter of the kind incorporating a filter casing, filter tubes or bags having a flattened oval cross-section, and internal spacing elements. The casing includes a vertical partition having perforations and dividing the casing into a pure or clean gas chamber and a gas dust-removing chamber. The tubes or bags are horizontally insertable into the dust-removing chamber through the perforations of the partition and are sealed at their open ends to the clean gas side of the partition while their closed ends are supported on the rear wall of the casing.In accordance with the invention, parallel vertical guide members, each having a surface which slopes with respect to a rear wall of the casing, are secured to the inner side of the rear wall of the casing. One guide member is disposed between two adjacent filter tubes or bags. The filter tubes or bags rest on support bars adjacent the rear wall of the casing, which engage said guide members.

Abstract: A circular type air filter preferably for automotive applications to filter air flow to the carburetor, has an open plastic housing containing a plurality of individual cartridge filters. The cartridge filters are made of aluminum or copper wool and are of differential porosity with the more dense filters closer to the air inlet whereby the air is diffused through the filter more uniformly.

Abstract: A baghouse filter apparatus including a collapsible bag filter assembly (20) for separating from a gas solid particles entrained therein. The collapsible bag filter assembly comprises a plurality of fabric filter bags (22) extending between a grid sheet (26) and a tube sheet (24) with at least one sheet being movable toward the other sheet and the other sheet being slidably mounted on rails (42). Legs (40) are provided to guide the movement of the one sheet toward the other so as to keep the grid sheet and tube sheet parallel and properly aligned as the bag filter assembly is collapsed. Once the assembly is collapsed, it may be easily slid out of the baghouse (10) through an access opening (30) in the baghouse to facilitate inspection, repair, and bag removal at a location external of the baghouse.

Abstract: An elongated tubular natural gas filtering vessel (12) has a plurality of longitudinal tubular filter elements (28) mounted therein by mounting means (44,68,70) which enables lateral displacement of filter elements (28) for longitudinal removal through a forward access port (18) of reduced diameter. A mast structure (44) mounts the filter elements (28) in a matrix array, including perimeteral filter elements (28) not aligned with the access port (18). A central mast (46) is rigidly mounted to the vessel (12) interior, and has a plurality of cross-bars (50) supported thereon. Each cross-bar (50) supports one row in the matrix array. The mast (46) has a plurality of forwardly extending ledges (48) between which are mounted a plurality of latching wrenches (60) with eccentric camming surfaces (64) for releasably locking in place a row of filter elements (28). A superstructure (68,70) is mounted to the mast structure (44) for securing the cross-bars (50) against lateral movement relative to one another.

Abstract: A filter assembly for use in an electrophotographic copying machine to collect used toner which is swept off a member carrying an electrostatic latent image, by means of a rotating brush comprises a filter unit having a toner receiver and a filter holder which are integrally formed together. The filter holder carries a filter element or elements therein, and the toner receiver allows the toner which falls down in front of the filter element to form a pile thereon. The unit is detachably mounted on the copying machine. A labyrinth seal is formed between the unit and the machine when the unit is mounted in place.

Abstract: A rigid cutout template is attached to the thin wall of a return air duct and suitably positions and supports an electrostatic air cleaner inserted into the duct through a cutout therein defined by the template. A power-pac and control box is secured elsewhere to the duct and includes high voltage power supply means, an air flow responsive switch and means visually indicating the existence of a power supply, the connection therewith of the electrostatic cell, and normal and abnormal current flow through the electrostatic cell.

Abstract: Powder collectors for the automatic collection and recycling of powders such as in a powder coating booth are disclosed. The collectors utilize a rollaway collection assembly having one or more cartridge filters therein so as to allow the quick change of vector assemblies on the coating booth for color change convenience. The cartridges themselves may also be readily changed as they preferably are not rigidly mounted to the collection assembly but instead merely sole positioned therein as to become functional upon turning on the air flow for the collection system. Continuous operation is provided by periodic blow-down of the cartridges with a fluidized bed providing automatic recycling (or disposal in the case of dust collection systems) of the collected powder. Various embodiments are disclosed including one embodiment utilizing envelope filters with an automatic blow-down provision.

Abstract: A filter assembly for filtering air comprises a filter housing and a filter which is removably positioned within the housing. The filter housing includes spaced-apart first and second housing portions which are connected by connecting members on opposite sides of the housing, and the filter is positioned between the two housing portions. One end of each of the connecting members is secured to the first housing portion, and the other end of each connecting member is connected to the second housing portion in a manner which permits the second housing portion to be moved along the connecting members toward and away from the first housing. When the second housing portion is moved away from the first housing portion, the filter can be removed.

Abstract: A work bench and air filter unit are combined in the present invention in a compact configuration by locating two or more air filter units below a work bench and arranging two or more air filter units in parallel with an extraction fan. An improved extraction efficiency is achieved by providing an enclosure located above the work bench wherein the back wall of the enclosure is angularly inclined forwardly at an angle of about 75.degree. with respect to the work platform, an air extraction slot being formed in the back wall communicating with an air plenum which is disposed rearwardly of the back wall through which air is withdrawn from the enclosure.

Abstract: A filter housing having one or more flow-through media support members releasably secured in the housing between the dirty gas inlet and the clean gas outlet to divide the housing into a dirty gas chamber and a clean gas chamber.

Abstract: Dust filter equipment includes a fibrous mat filter (37) having a low fibre density and a low loft so that when water is fed onto the filter it saturates the filter throughout its thickness and flows freely down the filter to form an effectively continuous body of water having a thickness virtually equal to the thickness of the mat filter.

Abstract: A filter chamber provided with a side wall having a row of uniformly spaced openings therethrough also has an end wall provided with an access door from which a track extends along the side wall below the openings. Filter units are insertable through the door for placement on the track. A rod extending lengthwise of the track and having an outer end accessible through the door is supported for axial movement back and forth parallel to the track between inner and outer positions. At longitudinally spaced intervals greater than the width of a filter unit lugs project from the rod, all in the same direction. There are as many lugs as the wall openings. The rod is rotatable to turn the lugs from positions in which they will overlap one side of filter units on the track to positions that permit the lugs to be moved to the opposite side of the filter units.

Abstract: A filter housing has an access opening for passage of a filter sideways into and out of the housing, the opening being surrounded by an outwardly extending flange surrounded by a flange on a removable door. Inside the housing, at the side opposite its outlet opening, is a pressure bar and a manually rotatable shaft that extends out of the housing beside the door so that it can be turned to actuate means for forcing the bar against a filter aligned with the outlet opening to seal the filter against the housing wall around the opening. Outside of the housing the shaft is provided with a screw thread, on which there is a nut for moving a doorstop into a position where it will prevent closing of the door whenever a filter is not being pressed against the housing side wall by the pressure bar.

Abstract: Filtration apparatus in which the filter medium is mounted at a slope with respect to the horizontal and in which there are means to vibrate the medium in a horizontal direction to assist the cleaning of the medium. A single chamber may contain many sheets of media, one version of the apparatus comprises a plurality of separate modular structures each containing at least one filter medium and in another version modular structures are so designed that they assemble into a stack and when so assembled form the necessary conduits by which each filter medium communicates with the necessary inlets and outlets for the relevant materials.

Abstract: In a filter assembly for particle-in-gas filtration, filter units are supported on a horizontal partition in the filtering position and are raised from the partition and moved horizontally to enable the filter units to be replaced. The invention may be used in nuclear installations.

Abstract: An arrangement for the exchange of filter hoses which are arranged in parallel in a filter box which is introduced into a filter chamber where contaminated gas enters through the sides of the filter hoses and purified gas leaves through their open ends. The filter box comprises a frame in which the open ends of the filter hoses are detachably fixed. The filter box is introduceable into a special chamber for the exchange of dirty filter hoses for clean ones by lowering the filter box through an opening in the chamber until the frame rests on supporting elements arranged in the opening. The detachable ends of the filter hoses are accessible from the "pure gas side," and the filter hoses, after being detached from the frame, drop down into the bottom of the exchange chamber for collection of the dirty filter hoses.

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 filter retaining device to prevent a unit filter from inadvertently falling out of a bottom access flow-through housing when the housing is opened to gain access to the interior. Bottom access flow-through filter housings typically include spaced apart elongated channels which slidably receive a unit filter. These channels serve to locate and hold a unit filter in a gas stream passing through the flow-through housing. The filter retaining means is removably attached to the bottom open end of each channel to support the unit filter in the flow-through housing when the bottom access is opened to gain access to the interior of the filter housing.

Abstract: An apparatus supplies to a selected region air laden with a vapor which may be a scent or a masking odor. The device may be controlled to hold the level of vapor in the selected region at a desired value. Provision is made for prevention of the loss of the compound to be volatilized when the device is not in use as well as when in use.

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

Abstract: A filter unit having a central member of substantially rectangle cross section and made up of one or more interconnected sections and having ends slidably fitting into end members of the same cross section. The central member is formed with ventilating apertures in front and rear walls thereof through which air can flow, and a filter medium is positioned in each section so that the air must flow therethrough. Filler strips are formed on and extend the length of the upper and lower edges of the central member and slidably fit in slots in the upper and lower edges of the end members so that said unit has continuous upper and lower edges in common upper and lower planes and extending the length thereof.

Abstract: The specification and drawings disclose a fluid filter device which includes a central body section clamped between a pair of end fittings by a plurality of longitudinally extending tie bolts. The tie bolt arrangement is such that only one bolt must be removed to permit the central body section to be swung out of position between the end fittings for filter cleaning, changing, or the like. The central body section includes a cylindrical through passage which extends longitudinally of the body perpendicularly to end faces which mate with the end fittings. A filter cartridge is received in the through passage and includes a cylindrical sleeve which is sized so as to be closely and slidably received in the passage. Filter elements are mounted within the sleeve. Additionally, seal rings are carried about the opposite ends of the sleeve to provide a fluid seal between the end fittings and the central body, as well as to prevent leakage between the outside of the sleeve and the wall of the passageway.

Abstract: A filter unit adapted for receiving a flow of fluid potentially carrying particulate material and for holding filters transverse to the flow is disclosed, and in one preferred application of the invention the flow is an air stream containing radioactive particles. The filter unit has a generally cubic-shaped housing having a fluid inlet opening and a fluid outlet opening in two opposite surfaces and preferably these openings are provided with flanges. The housing is also provided in its lateral surfaces with a first opening and a second opening enabling insertion and removal of filters though these openings. The openings are preferably in the same lateral surface or wall. Each opening has a door means mounted to close the opening with each door means being capable of being opened at least 90.degree. to the lateral surface of the housing on which the door means is mounted.

Abstract: To increase the degree of separation of liquid droplets from a stream of gas by means of a separator consisting of a packet of wire gauze arranged in a pipe, the packet is subdivided along its height by discharge channels arranged transverse to the direction of flow.

Abstract: A fluidizing assembly is provided having a readily removable and replaceable filter assembly. The filter assembly comprises a supporting grid member, a filter member and an open frame member upon which may be mounted a seal member. The fluidizing outlet assembly comprises an outlet body having a lower body flange and a bottom pan having an upper pan flange spaced below the lower body flange. A pair of filter assemblies are inserted between the lower body flange and the upper pan flange, and engages a filter support assembly located above a fluidizing header in the midportion of the outlet. Preferably the filter support assembly is provided with raised surfaces for forcing the filter assembly into operative position. The bottom pan includes passages in fluid communication with the fluidizing header which define a plenum for directing the fluidizing air below the filter member, and supports for the filter member.

Abstract: A T connection including a body and a pair of aligned laterally extending projections form fluid passage means. An annular flange is formed on one of the lateral projections internally thereof and a flange is formed on the other lateral projection externally. A hollow annular filter member is positioned in the lateral projections and abuts the internal flange at one end and is closed off at the other end by the external flange on the other lateral projection. The filter member includes a core formed of generally trapezoidal or triangular shaped metal wire or strip material which has in the trapezoidal form two parallel surfaces joined by converging side surfaces. The strip material is either helically wound to form coils or formed by a plurality of rings which are longitudinally spaced a predetermined amount and a plurality of circumferentially spaced reinforcing ribs are secured to the periphery of the core.

Abstract: An air filter system for an internal combustion engine comprises a caisson which contains a series of superposed compartments containing horizontal, removable filter elements, each of which elements is supported on a wedge-shaped slide which, in turn, is supported on an inclined wall which allows the slide and filter element to be removed from the inlet side of the caisson for replacement of the filter elements. The inclined walls are alternated with horizontal walls, the latter being provided with openings into which the filter elements are inserted, and the entire series of superposed compartments can be formed from a single sheet of metal bent into a zig-zag configuration.

Abstract: A vertically oriented, sheet metal enclosure includes a frusto-pyramidal lower section forming a hopper for separated particulate matter from an air stream which enters a middle section from a downwardly and inwardly inclined inlet duct fixed to one side of that section at the upper end, causing impingement of the airborne particles against the side of the hopper to effect a swirling action to the air stream. An array of laterally spaced, inclined baffle plates at the upper end of the middle section separates the middle section from an upper section which carries tensioned tubular filter bags. An enclosure cover defines an outlet opening feeding to a cover mounted blower.

Abstract: A mounting for gaseous fluid filters is disclosed particularly suited for filters of the type which include a rigid box frame within which the filter is carried, the frame having opposite faces open for entrance and exit of the gaseous fluid to be filtered, the mounting including an enclosure with supporting tracks therein for the filter frame, the filter being detachably connected at its upper end to the duct system by a flexible leakproof fabric connection and being sealed at the lower end against leakage.

Abstract: An apparatus for electrically separating particles from a gaseous stream in which high-tension means and a plurality of earthed collecting means are positioned in a housing having inlet and outlet means for flow of the gaseous stream therebetween. The high-tension means is connected to a source of high voltage direct current and charges the particles in the gaseous stream. The plurality of earthed collecting elements are disposed in the gaseous stream in the housing to collect charged particles in the gaseous stream. Each collecting element comprises a matrix of alternate flat paper strips and corrugated paper strips glued to each other to form through-flow channels for the gaseous stream. The periphery of the matrix is connected with an electrically conducting, earthed metallic layer to form a block of corrugated paper with edge portions connected to current conducting earthing means.

Abstract: The improved dust bag is designed for use with an upright vacuum cleaner and is made of air impervious material. The lower end of the dust bag is connected with the base of the upright vacuum cleaner adjacent to the air discharge outlet of the vacuum cleaner. A first, relatively large opening is formed in the dust bag and defines the flow path through which air may flow out of the dust bag. An inner wall divides the interior of the dust bag into first and second compartments and includes a second opening which is aligned with and coincides, in size and shape, with the first opening and which permits air to flow from the second compartment to the first compartment. A filter is disposed in the first compartment adjacent to the first opening and is utilized to filter the air as it flows out of the dust bag through the first opening.

Abstract: Air conditioning apparatus ventilates room air with environmental air after the environmental air has been filtered, heated and humidified to appropriate levels. Environmental air is drawn into an intake duct, is passed successively through an air filter, an electric filament heater and is humidified by directing the air stream through a moving evaporator belt which is saturated with water from a water tank which is automatically controlled by a humidistat. The humidity level and temperature are automatically maintained by means of the humidistat and air temperature sensor.