Abstract: A number n of equal receptacles, the bottom of which is a filtering screen, arranged adjacent to each other making up a circular structure which is rotated through an intermittent travel of 1/n of a full turn, with respect to a horizontal shaft in the center of the structure, in such a way that sequentially and at regular intervals, two of these receptacles, one of them positioned at the top with its mouth upwards and its bottom horizontal and the other inverted in the lower position, are at the same time faced with an unfiltered brine effluent delivered through a nozzle (the upper one) and a pressurized cleaning fluid swept against its bottom external side (the lower).

Abstract: The disclosure concerns a hollow cylindrical filter cartridge composed of an annular pleated filter medium surrounding a central perforated plastic tube, the ends of which cartridge and tube are embedded into plastic annular discs for closing the ends of the pleats of the filter media and providing an internal centrally threaded socket adjacent the inside of said perforated tube, which socket has an inner integrally projecting shoulder. Continuous outwardly threaded plastic nipples having a length of slightly more than twice the depth of said sockets to their shoulders provide connections between adjacent axially aligned cartridges which are sealed together by the abutment of the ends of said nipples against said shoulders. A plastic internally threaded cap having a depth greater than half the length of said nipples, may be threaded on the outer end of a nipple extending from a cartridge for closing that end.

Abstract: A metallic profile wire screen for a filter surface for use with a tilting pan type filter exhibiting sufficient open area for acceptable liquid flow with optimum spacing between the profiled wires for the retention of solids being filtered.

Abstract: A cake filtration apparatus in a structural unit which comprises a plate filter and a filtering aid-dosing device which includes an agitator. The drive parts for rotating the filter unit are disposed on the top wall of the filter housing, and are connected with the drive of the agitator by means of a transmission device and a freewheel coupling. The shaft of the filter unit is only sealingly and rotatably mounted in the vicinity of the bottom of the housing. The bottom plate, the height of which is adjustable for removal of the centrifuged filter cake, is constructed in the manner of a disk valve having a valve seat, and can be raised and lowered independently of the filter unit, so that for centrifuging and removal of the filter cake, the filter unit no longer has to be raised or in some other manner moved out of its operating position.

Abstract: A horizontal rotary table filter includes a device connecting the filter table to the carrier structure which provides freedom of movement between the two in the radial direction, to thereby maintain the filter table in a substantially planar condition under adverse operating conditions. The device preferably includes a radially oriented slideway connected to one of the table and the carrier structure, and slide shoes or rollers connected to the other of the table and the structure and disposed within the slideway. In addition to enabling relative radial movement, the device is so constructed as to provide a space between the table and the structure and thereby thermally insulate one from the other. Also disclosed is a more stable carrier structure which includes circumferential and diagonal connecting members disposed between adjacent radial gussets.

Abstract: Concurrent operation of a sizable number of vacuum filtration units is facilitated by a rotatable carrier stand. Any selected one of the units may readily be turned to a position convenient to the operator without interruption of the vacuum connections and without entanglement of vacuum lines. Components of the filtration units may then be manipulated with a reduced risk of breakage, spillage or inadvertent disconnection of vacuum lines. Installation and removal of a filtration unit may be accomplished very quickly and simply with the use of only one hand in some cases. Simultaneous filtering operations may be performed more efficiently particularly within enclosures such as fume hoods, glove boxes or the like which otherwise restrict access to the filtration units by an operator.

Abstract: Thickening of paper pulp, or a like suspension, is effected prior to feeding the pulp to an apparatus utilizing stationary screens for effecting washing, bleaching, or further thickening of the pulp. The stationary screens are mounted in a top portion of a vertical-axis vessel, and a plurality of radially extending rotating hollow arms, with annular screens mounted on them, is provided in the bottom of the vessel to effect thickening of the suspension from, for example, 11/2% consistency to about 9-14% consistency. Extraction from the hollow arms is provided through conduits extending vertically through a hollow shaft for rotating the arms, and a filtrate valve is also mounted within the hollow shaft in operative communication with the filtrate conduits, and includes a valve member which is rotatable in a different direction, and at a different speed, than the hollow shaft.

Abstract: An anchoring device for anchoring a grid relative a frame member of a filter pan is disclosed. The anchoring device comprises an aperture defined by the grid. An open topped housing is rigidly connected to the grid with the open top of the housing registering with the aperture. An orifice is defined by the base of the housing and an inverted U-shaped strap removably extends through the orifice. The strap is rigidly secured to a cantilevered bracket which is rigidly connected to the frame member. A tapered surface cooperates with the strap and is removably wedged between the strap and the base of the housing.

Abstract: A mechanism for processing paper stock to be supplied to a papermaking machine with a filter having a plurality of axially spaced disks on a horizontal axis with a receiving chamber for receiving stock distributed over an elongate area along which the filter disks are distributed, a flow distributor having a broad delivery channel connected to feed stock to the filter receiving chamber and a broad main flow channel in communication with the delivery channel and a receiving passage at one end with a plurality of baffles in the main flow channel having a main wall portion defining flow passed therebetween and an entry wall portion extending in the direction of flow in the main channel so as to cause the flow to reverse directions, with the main flow channel being tapered from the entry end to the opposite end.

Abstract: An extraction device for treating liquid-solid mixtures such as sewage sludge or paper pulp to remove liquid therefrom, includes a preliminary treatment station. The preliminary treatment station comprises at least two interchangeable perforated containers located on a displaceable receiver turntable beneath which a stationary disc is coaxially located. The stationary disc is provided with an aperture eccentrically disposed thereon, the aperture having a cross-sectional area corresponding to the cross-sectional area of the lower end of the container located on the turntable and to the cross-sectional area of an inlet aperture provided in the extraction device.By rotating the receiver turntable in a timed sequence a container is always moved beneath a filler tube, filled and further rotated. The solid components drop to the bottom of the container and liquid is discharged through the perforations provided in the container and the mixture thus has liquid removed in a preliminary treatment.

Abstract: A filter element sealing device for a filter pan in which a rubber sealing strip cooperates with one or more ledges formed in the peripheral sidewall of the pan to lock the edge of the filter element between the sealing strip and the sidewall of the pan. A metal plate cooperates with the sidewall of the pan to merge the sealing strip against the sidewall of the pan to secure the filter element therebetween.

Abstract: A dynamic filtering system as described in which particulates are separated from a fluid as the fluid is moved by centrifugal force through filtering elements. A rotor mechanism received the fluid initially through a central inlet opening. The rotor is then forcibly rotated so the fluid is forced by centrifugal action out through a series of radially oriented passages. Filter elements are removably secured in the passages to intercept and trap particulates passing through the filter elements. Access to the filter elements is allowed without requiring disconnection of the inlet, discharge or rotor driving mechanisms.

Abstract: A device for filtering a liquid, particularly molten polymer, removes incompletely molten polymer, foreign matter, aggregates of various additives and the like from the molten polymer prior to further processing of the liquid such as extrusion through a spinneret plate. The device comprises a housing provided with a liquid inlet and a liquid outlet and, positioned between the inlet and the outlet, a filter pack built up of a number of filtering disks and supporting disks. The disks are so arranged the liquid to be filtered is caused to flow between a center portion and an outer surface of the filter pack. On the filter pack there is placed a piston for applying a compressive pressure to the pack. The piston is displaced and acts to compress the filter pack on a liquid supply side under the influence of the pressure of the liquid to be filtered.

Abstract: A rotary filter of the type described in U.S. Pat. No. 4,193,875 in which each of the filter disks, axially spaced on the rotating shaft, is subdivided into a plurality of sections or cells and each of the sections is connected by a tube to a fluid distributor or control head for evacuation, pressurization or the like. According to the invention, each of the passages connecting each section with the control head is formed by a unitary tube having an axially extending section, a bend and a radial section connected by the bend to the axial section. In the control head a disk fixed to the hollow shaft is provided in which the ends of the axial sections terminate removably and sealingly. The radial sections are fixed to the filter-segment carriers, e.g. by flanges and screws or bolts through these flanges.

Abstract: An improved array of filter elements for a self-cleaning filter screen apparatus for continuous removal of suspended solids in a fluid. The filter elements are staggeringly interconnected in the form of an endless belt for movement through the fluid. Each filter element includes an arm with a first hub at the front end and a curved rake or hook at the other end. The arm has a front arm portion or shank portion connected to a rear arm portion. A second or intermediate hub is connected between the front arm portion and the rear arm portion. A row of the filter elements are mounted on two shafts. The front hubs from a rearward row of filter elements are positioned between the intermediate hubs of the forward row of filter elements and each hub is spaced from the adjacent hub. The scraper-separator means is sized to fix the distance between adjacent filter elements similarly connected on the same shafts.

Abstract: In process for the separation of liquids from suspensions by means of at least one filter layer, on one side of which a suspension is fed and solids accumulate, and on the other side of which separated liquid is carried away, there is given an improved clearing of the feed side filter surface (ZFF) and thus a lengthened operation time until maintenance of the filter layer, through a flow movement (P.sub.1, P.sub.2) in the suspension chamber (SPR) with movement components oscillating in the normal direction in relation to the filter surface (ZFF), preferably through a suspension flow oscillating between filter surfaces (ZFF) lying opposite each other. An apparatus for the separation of liquids from suspensions makes possible such an improved operation through the suspension-drive device (AV.sub.1) with a plurality of surface elements (FE.sub.1, FE.sub.2) in the direction of movement and which can be flowed around transversely thereto (FIG. 5).

Abstract: An apparatus for producing agglomerates from a rotary filter such as a rotating filter drum, which includes a perforated filter member on the filter, a slotted member disposed on the filter member and a sludge or slurry storage means disposed above the slotted member, the storage means discharging solid particles of the sludge into the slotted member essentially in the direction of solid sedimentation.

Abstract: A collar for fitting over the upper end of the cake discharge chute of a rotatable disc filter, or the like. The collar has a plurality of downwardly and inwardly sloping walls which substantially reduce any tendency for cake to stick to the sides of the chute. For use with heavy cake, reinforcing members may be provided for the collar. The collar is configured for use with discharge chutes of diverse design.

Abstract: According to the invention, a cartridge filter for cleaning liquids and gases from mechanical impurities comprises compartments containing filtering cartridges, a pressure difference indicator and a control unit. The compartments are provided with cover plates having pipes for filtering and cleaning the compartments containing the cartridges, perforated guides and a spring device for locking the cartridges. The filter is also provided with mechanisms for moving the compartments and cover plates and a device for storing and replacing the filtering cartridges. The filter according to the invention enables an improved productivity owing to the elimination of manual operations of disassembly, replacement of cartridges and assembly of the filter, compliance with sanitary requirements and reduction of losses of filtered product.

Abstract: A centrifugal microstrainer includes a closed cylindrical vessel with a cylindrical screen within, both rotating about a hollow shaft forming a common central axis. Liquid-solid admixture introduced through the shaft is flowed radially outward subjected to centrifugal acceleration, and forced back through the screen under pressure with particles too large to pass the screen remaining on its outboard side. The centrifugal force applied by the rotation of the vessel acts on these larger particles pushing them away from the screen thus preventing clogging and permitting substantially continuous operation. The device may be operated as a classifier by providing a plurality of concentric screens of decreasing mesh size spaced outwardly from one another in conjunction with properly sized chokes.

Abstract: An illustrative embodiment of the invention provides an electromagnetic filter for fluids in which two magnetizable beds are longitudinally separated. Each of these beds is provided with its own respective magnetizing coil. Incoming fluid is admitted to the space between the magnetizable beds. This flow is divided into two longitudinal oppositely directed streams in order to enable each stream to pass through its respective bed.

Abstract: Flowable material is pumped between upstream and downstream passages in a body through an aperture portion formed in a slide member that communicates between the passages. An annular seal member engages the slide member under the urging of a Belleville spring. The slide member, formed as a filter, has a region of uniform porosity that is moved progressively through the path of flow of the material for changing the filter.

Abstract: A multi-disk rotary filter in which a plurality of disks on a common shaft are partly immersed in a trough containing the suspension to be filtered and each of the filter disks is formed with a plurality of filter sectors or cells each connected to a control disk through which the filtrate is evacuated. According to the invention, each disk is formed with a cell carrier with a radial passage communicating with each sector and merging into an axial passage. The axially extending passages of at least some of the disks are formed at least in part by straight tube sections outwardly of the shaft.

Abstract: Process for purifying an iron containing zinc sulfate solution which comprises precipitating iron from said solution as a slurry in at least one of the following forms at a pH which is maintained lower than 4: basic sulfate, jarosite or goethite; filtering said slurry on a planar horizontal filter and forming a cake on said planar filter; washing the cake directly on the planar filter with water supplied onto the cake without forming a newslurry with washing water and thus freeing the cake from water soluble zinc and copper compounds promptly before hydrolysis thereof insolubilizes said compounds as basic sulfates, whereby the solid residue in the cake does not contain substantially more insoluble zinc content than it contained in the slurry being fed to the filtration.

Abstract: A rotary filtering apparatus having improved filtrate flow conducting means.

Abstract: A filter apparatus comprising a container, a plurality of sets of rotatable filter elements disposed in the container, each set comprising first and second circular filter plates of different diameters with one or more holes provided in each plate at predetermined distance from the center thereof, and interleaved with third plates of a smaller diameter than the first and second plates, with the sets disposed in a line and sealed in the container with exits provided aligned with the holes. The sets of filter plates are rotated in the same direction. Unfiltered material is supplied to the container at the top and due to the centrifugal force of the rotating plates, the sludge is separated from the liquid and moved toward the outer peripheries of the plates, and then transferred from one plate to the next plate down the line until the sludge is accumulated toward the end of the line.

Abstract: An apparatus for continuous liquid-solid separation has suction boxes which respectively have a suction hole on a rear surface and a perforated surface at a front surface and said suction boxes being connected in series to form a conveyor and said suction holes being connected to a suction trough so as to give the sucking condition of the suction boxes in the zone of the suction trough wherein a filter cloth is contacted with the perforated surfaces of the suction boxes and is held by side plates which can be closed and opened at both sides of the suction boxes and the filter cloth and the suction boxes are moved at the synchronized velocity under suction.

Abstract: A filtering apparatus comprises a housing defining a generally closed chamber in which is provided a hollow rotatable shaft that carries a plurality of filter elements. Each of these elements is formed as an upwardly dished fluid-impervious metal plate formed with a central hole through which the hollow shaft passes and having a concave upper face formed with an array of spaced-apart bosses. A fluid-pervious filter cloth lies on the plate directly against the bosses so as to be spaced from the plate between the bosses. A ring secured to the smooth edge of each plate secures the respective filter cloth in place.

Abstract: A drainage device for particulate material in liquid suspension is in the form of a rotating wheel having circumferentially spaced foraminous buckets scooping out liquid and suspended particulate material from a vessel. Rotation of the wheel about its axis takes place in arcuate steps by the operation of a pair of axially spaced plunger and cylinder assemblies engaging alternately in cyclic fashion with shoulders circumferentially spaced about the wheel axis.

Abstract: A self-cleaning filter and vortexer is provided in which a filter rotates over the clean fluid outlet port of a vortexer cannister in the direction of the flow of fluid into the tangential inlet port of the vortexer. The peripheral velocity of a freely rotating filter will approximate the flow velocity of the fluid into the tangential inlet port to enhance the centrifugal acceleration effect of the vortexer and the dynamic cleaning of the filter medium. This acceleration enhances centrifugal separation of the heavier particulates in the vortexer and enhances the dynamic cleaning of the fines and other particulates from the filter medium. The drive mechanism for rotating the filter may be designed to be uneven so as to shake the filter medium as it rotates. The flow of fluid will pass thru the filter medium and be exhausted as a cleaned fluid into the outlet port of the vortexer cannister.

Abstract: A disc filter chute liner for being inserted in the passageway formed in a cake discharge chute of a disc filter and for being interposed between the cake discharge chute and cake passing therethrough and for preventing the cake from adhering to the cake discharge filter, the disc filter chute liner being provided with smooth and slick internal surfaces with respect to the cake whereby the cake passing through the liner will not adhere to the smooth and slick surfaces and thereby in turn will not adhere to the cake discharge chute.

Abstract: A method and apparatus for dewatering of cellulose pulp or other fiber suspensions. A suspension of relatively low solids concentration is passed into a sealed housing through an inlet, substantially filling the housing. The suspension is dewatered by bringing it into contact with perforated surfaces of a pair of drums or the like mounted for rotation about a vertical axis within the housing. Liquid from the suspension passes into an interior drum chamber, and at least a portion thereof is expelled from the housing through a liquid outlet. After passing a nip point between the two drums, the suspension has a higher solids concentration than the desired product suspension, and an amount of liquid is added thereto from the drum interior to dilute it to the final concentration.

Abstract: There is disclosed a drainage device for gravel and sand which provides a higher degree of drainage than is obtainable with known drainage devices, consisting of a rotatable bucket wheel, scoop-buckets distributed around the periphery of the bucket-wheel, a chamber and a drainage hole associated with each scoop-bucket, the drainage holes being arranged in a disc-like sidewall of the bucket wheel, and a suction box connected to a vacuum pump and sealingly engaging said side-wall for applying sub-atmospheric pressure successively to each chamber as the bucket wheel rotates.

Abstract: A hollow upright shaft is surrounded at axially spaced locations by spacer rings. Intermediate these rings the shaft is surrounded by substantially horizontally oriented plate-shaped filter elements which rotate with the shaft. Each filter element has a liquid-impermeable annular plate the upper surface of which carries a filter material. The inner circumference of the plate is formed with a downwardly extending stepped collar which is received in the subjacent spacer ring and thus centers the filter element with reference to the ring and to the shaft. The latter has openings in its periphery through which filtered liquid can flow into the interior of the shaft, to be led away.

Abstract: In a filter apparatus of the type having a receptacle and an upright hollow shaft which is rotatable in the receptacle, a plurality of substantially horizontal filter elements are mounted on the shaft axially spaced thereon and rotatable with the shaft. Each of the filter elements includes a plate member which is imperforate and a filter cloth which overlies an upwardly facing side of the plate member. Spacers are located between each pair of adjacent filter elements, and each spacer includes a ring portion which surrounds the shaft and spaces the adjacent filter elements from one another, and a plurality of spoke portions which extend outwardly from the ring portion and of which each has an upper edge engaging a downwardly facing side of the plate member of the upper filter element of the pair, and a lower edge engaging the filter cloth on the lower filter element of the pair, in order to hold the filter cloth against the associated plate member.

Abstract: A filter unit for wet and dry filtration comprising a hollow shaft provided with ribs in parallel position with respect to the longitudinal axis of the said shaft, filter discs covered by a filtering material, said discs being stacked over and enclosing the shaft in positive connection therewith, the lower surfaces of the said filter discs having radial elevations the height of which corresponds to the distance between two adjacent discs, spacer rings provided with cams arranged between each filter disc and the respective filtering material, the said spacer rings enclosing the hollow shaft and the free cross sectional area between the cams of the said spacer rings diminishing from one disc to the other.