Backwash Or Blowback And Additional Cleaner Patents (Class 210/393)
  • Patent number: 4655910
    Abstract: Liquid filter devices, particularly for irrigation systems are known to comprise automatic, periodic reverse-flow rinsing arrangements, whereby water is flushed in the opposite direction to release clogged particles from the filter member. The disclosed devices utilize the reverse, flushing water flow to release the filter member of the device from its normal, stationary position, and rinse it by jets. The jets are also useful to impart a rotatable movement to the filter member. In the case of disc filters, the discs become released and spaced from each other, and individually spin during the rinsing thereof.
    Type: Grant
    Filed: April 4, 1986
    Date of Patent: April 7, 1987
    Assignee: AR-KAL Plastics Products Beit Zera (1973)
    Inventor: Elhanan Tabor
  • Patent number: 4655911
    Abstract: A filter device is disclosed in which the filter element is made to spin about itself during reverse-flow, flushing operational stage thereof. The device comprises a sprinkle member rotatably supported inside the filter element. Reaction forces generated by water jets forced through the sprinkle member cause its rotation, and the filter element is then caused to rotate by the jets sprayed against its inner surface. In a preferred embodiment disclosed, the filter is of the disc-type, provided with a hydraulic cylinder adapted to release the compact engagement of the disc. The discs become separated from each other, each disc being imparted the rotational movement of the rotating jets.
    Type: Grant
    Filed: April 4, 1986
    Date of Patent: April 7, 1987
    Assignee: AR-KAL Plastics Products Beit Zera (1973)
    Inventor: Elhanan Tabor
  • Patent number: 4642188
    Abstract: A multi-element filter unit includes backwash apparatus and comprises a filter casing with provision for alternative, oppositely directed process liquid and backwash liquid flows therethrough. A plurality of filter tubes are close spaced within the filter casing. A flange engages the filter tubes and divides the filter casing into first and second chambers. Apparatus for sequentially backwashing the filter tubes during a backwash interval removes collected solids from between the filter tubes by flow of backwash liquid from one filter tube outward toward the exterior of adjacent filter tubes.
    Type: Grant
    Filed: May 29, 1985
    Date of Patent: February 10, 1987
    Assignee: Dover Corporation
    Inventors: Richard B. DeVisser, Sydney Hagerty
  • Patent number: 4612117
    Abstract: A vertically arranged filter drum (6) is installed in the feed chamber (2) of the cylindrical housing (1) of the filter, this drum having a closed upper end and an open lower end. The filter drum (6) consists of an outer (13) and an inner (14) supporting basket exhibiting a screen (15) with passage openings for the liquid to be filtered, as well as of a filtering basket (16) disposed between the two supporting baskets (13, 14), the filtering basket being made of a filter material, for example perforated sheet metal. The filter drum (6) is rotationally driven by a shaft (10), supported in a post (8) on the filter housing (1), and by a motor (11) and is seated with its lower open end with running clearance in the discharge chamber (4) of the filter housing (1). The liquid to be purified enters the feed chamber (2) of the filter (1) via the inlet (3), and the purified liquid leaves the filter through the outlet (5) of the discharge chamber (4).
    Type: Grant
    Filed: August 13, 1985
    Date of Patent: September 16, 1986
    Inventor: Walter Neumann
  • Patent number: 4604195
    Abstract: A filter press for the thickening of cellulose pulp or sludge in which the filter press is furnished with a feedbox to lead the sludge suspension to the wire. In order to increase the capacity of filter presses or the like, the sludge to be dried can be fed through a feedbox in accordance with the invention, in which box there is at least one surface penetrating the liquid to facilitate thickening of the sludge suspension before it is lead to the filter press wire.
    Type: Grant
    Filed: April 23, 1984
    Date of Patent: August 5, 1986
    Assignee: Enso-Gutzeit Oy
    Inventor: Tuomo Lintunen
  • Patent number: 4597865
    Abstract: A cylindrically-shaped horizontal rotating unit which separates liquids from liquid-bearing materials, such as sludge or sewage, is the subject of this invention. After the liquid-bearing material is fed from a pipe onto a tray or head box located at the bottom of the feed end near the circumference of the unit, the material flows from onto the interior of the cylinder which contains bar screens around its circumference. The cylinder is rotated at variable speeds while the material is fed into it. When the cylinder is rotated liquids are drained from the material through bar screens contained around the circumference of the cylinder and into a drain pan below the cylinder thereby leaving the remaining material more solid. Additional features of this invention include interrupted pitched flights or blades protruding from the inside of the cylinder, which not only push the materials toward the discharge end of the cylinder but also roll the material end over end to remove even more liquid from the material.
    Type: Grant
    Filed: January 11, 1985
    Date of Patent: July 1, 1986
    Inventors: Arthur J. Hunt, Arthur J. Hunt, Jr.
  • Patent number: 4551255
    Abstract: An endless moving filter belt of fine mesh, woven polymeric fibers is provided through which is passed a liquid containing particles, such as from an oil cooking bath. The particles are filtered from the oil bath, and deposited on the belt. The particles are then continuously scraped off the filter belt and onto an endless moving discharge belt where they are dried and carried to waste. The filter belt is continuously flushed by hot, filtered recycle oil.The system also may be used for filtering sewage, in water clean-up, for separating water and metal particles from milling machines, etc.
    Type: Grant
    Filed: October 17, 1984
    Date of Patent: November 5, 1985
    Assignees: R. Craig Miller, Pro/Pak Industries, Inc.
    Inventor: R. Craig Miller
  • Patent number: 4529509
    Abstract: A screen machine, particularly for cellulose pulp and recycled pulp, which includes a screen rotor (15), which is rotatable in a housing (16) having an inlet (17) for pulp suspension, an outlet (18) for accepts and a discharge opening (19) for rejects. The screen rotor (15) is so arranged between the inlet (17) and the outlet (18) that flow therethrough from its inlet side has a radially inward directed component. On the outlet side of the rotor (15) is arranged at least one stationary baffle means (26), which separates a sector of the screen rotor from the outlet. Along at least a part of this sector there is communication between the inlet (17) and the space between the rotor (15) and the baffle means (26).
    Type: Grant
    Filed: October 7, 1983
    Date of Patent: July 16, 1985
    Inventor: Harry Nilsson
  • Patent number: 4518494
    Abstract: An industrial water intake comprising a screen for screening water and a spray nozzle for detaching deposited debris from the screen and entraining it into a debris recovery channel on the other side of the screen from the spray nozzle. A cylindrical rotary member comprising a roller is arranged along the adjacent longitudinal edge of the debris recover channel. The rotary member rotates in a direction tending to carry debris falling on or coming in contact with the longitudinal edge into the channel to prevent the build up of debris thereon. The rotary member extends above and is disposed inwardly of the longitudinal edge relative to the debris recovery channel. The rotary member is usable on recovery channels for band screens, drum screens or even bar screens associated with trash rakes.
    Type: Grant
    Filed: April 7, 1983
    Date of Patent: May 21, 1985
    Assignee: E. Beaudrey & Cie
    Inventor: Philip Jackson
  • Patent number: 4498988
    Abstract: A scraping mechanism for scraping off deposit material from a surface of a moving body, including a scraper having a bladed edge at the fore end thereof, a mechanism for pressing the scraper against the surface of the moving body, and a mechanism for reciprocatingly driving the scraper on and along the surface of the moving body in parallel relation therewith.
    Type: Grant
    Filed: November 24, 1982
    Date of Patent: February 12, 1985
    Assignee: Kabushiki Kaisha Kobe Seiko Sho
    Inventors: Kiyoshi Fujita, Shirou Toyohisa, Osamu Katou, Kenji Ishimaru
  • Patent number: 4477343
    Abstract: An inlet pipe having two branch pipes and an outlet pipe having two branch pipes, between the inlet and outlet pipes of each branch, there being a dump valve and a dump control valve, each outlet branch pipe containing in it a filter, the dump control valve sensing the pressure on each side of the filter and being operable, on pressure differential building up, to open the dump valve; by opening of either one of the dump valves, the water will flow through the inlet tube, the inlet branch tube of the outer dump valve and rearwardly through the filter element. The filter element will thereby be backwashed, and the particulate material which has been built up will be at least partly discharged through the dump valve to drain.
    Type: Grant
    Filed: December 31, 1981
    Date of Patent: October 16, 1984
    Assignee: Ris Irrigation Systems Pty. Limited
    Inventor: Alfred D. Tucker
  • Patent number: 4470913
    Abstract: A fluid assisted doffer (30) is disclosed in combination with a fluid filter (10). The fluid filter (10) includes a rotatably mounted drum (23) covered with a filter screen (25). Fluid is filtered through screen (25) from the upstream to the downstream side to form an overlying porous layer of particulate matter. The downstream side of the drum (23) includes filter chambers (A) and (B) being sealed against direct fluid flow. The fluid assisted doffer comprises a doffing chamber (45) positioned on the downstream side of screen (25) at the position where the overlying porous layer of particulate matter is to be removed from the screen (25) and communicating through the screen (25) with the upstream side thereof. The doffing chamber (45) is sealed against direct fluid communication with filter chambers (A) and (B) on the downstream side of the screen (25).
    Type: Grant
    Filed: June 7, 1983
    Date of Patent: September 11, 1984
    Assignee: Terrell Machine Company
    Inventor: John P. Kieronski
  • Patent number: 4447324
    Abstract: A water screen comprises a revolving screen member, e.g., a band screen or a drum screen, and a washing device. The washing device, comprises a sprayer on one side of the downstream run of the screen member and a recovery channel on the opposite side of the downstream run of the screen member. On the same side as the recovery channel and between it and the sprayer is a mobile trough member. The trough transversely and obliquely from its leading edge adjacent the recovery channel, e.g. a band screen or a drum screen. The leading edge of the trough is maintained continuously in contact with the screen member which may be exclusively by the effect of gravitational force on the trough member.
    Type: Grant
    Filed: April 8, 1982
    Date of Patent: May 8, 1984
    Inventor: Philip Jackson
  • Patent number: 4431541
    Abstract: A circular filter having separated inlet and outlet compartments such that cheese whey or the like is pumped into the vessel, is forced across a filter screen, and the filtered whey is discharged downstream for further processing. This invention incorporates (1) two rotating showers to clean the filter and (2) an outlet valve which recycles filtered whey for additional filtering and cleaning.
    Type: Grant
    Filed: August 25, 1982
    Date of Patent: February 14, 1984
    Inventor: Arleigh Lee
  • Patent number: 4368125
    Abstract: Apparatus for extracting liquid from a suspension includes a horizontally mounted rotatable filter media covered concentrator drum with an inner drum rotatable about a horizontal axis within the concentrator drum and defining a suspension transition chamber therebetween. The drums are mounted in a common frame and are rotated in opposite directions with the suspension being introduced at one end of the transition chamber. Angularly disposed vanes on the outer surface of the inner drum convey the suspension through the transition chamber and turn and lift the suspension to a maximum elevation below the top of the transition chamber with the suspension falling back before reaching the top of the transition chamber. The filter media is cleaned as it moves at an elevation above the suspension.
    Type: Grant
    Filed: August 3, 1981
    Date of Patent: January 11, 1983
    Assignee: Passavant-Werke AG & Co. KG
    Inventor: James D. Murray
  • Patent number: 4310424
    Abstract: An apparatus and method for filtering and classifying waste or process streams into three product streams using a polymeric net belt to drive a filter drum and hydrophobic polymeric filter element thereon. A matte of solids is doctored from the belt to provide a first product stream. A roller mounted on a fluid cylinder driven pivoted arm compresses the filter element to provide a smaller suspended solids stream for collection in a trough inside the drum. This second product stream is removed axially from the trough by means of a pump. A third clarified or effluent stream is produced and collected in the drum as the stream passes through the foam filter element. This third stream is removed axially in the direction opposite of said second stream. A shower keeps the foam in the compressed area water filled to prevent vapor lock or gas blockage in the cellular foam filter.
    Type: Grant
    Filed: July 23, 1980
    Date of Patent: January 12, 1982
    Assignee: Champion International Corporation
    Inventors: Henry A. Fremont, Mary C. Obenour, Edward F. Hedrick
  • Patent number: 4310414
    Abstract: A portable machine for separating liquid from a slurry comprising an interconnected pair of beams cantilevered above the base with a plurality of rollers rotatably mounted between them. An endless belt is carried on and driven by the rollers to move upward from a slurry hopper, over a source of liquid-drawing vacuum, and back down under the hopper and collector tank. The belt and rollers are scraped and washed on the return run and, because of the cantilevered configuration, the belt is easily removed by sliding it off the rolls from one side of the machine.
    Type: Grant
    Filed: March 27, 1981
    Date of Patent: January 12, 1982
    Inventor: O. Wade Lux
  • Patent number: 4279760
    Abstract: The present invention utilizes a closed-type vessel comprising a filtering chamber, at least one perforated filter cylinder a portion of which is positioned within the filtering chamber, said filter cylinder being rotatable at any desired speed and having a filtering surface covered with a filter cloth, and a squeezing roll and sealing roll which engage with said filter cylinder through the filter cloth at all times to define a sealing and operating wall. Any sewage to be treated is supplied under pressure to the filtering chamber and filtered through the filter cloth at the filtering surface of the filter cylinder. Filter cake deposited on the filter cloth is continuously transferred to the outer periphery of the squeeze roll and then separated therefrom outside the filtering chamber by any suitable means such as a scraper.
    Type: Grant
    Filed: May 30, 1980
    Date of Patent: July 21, 1981
    Inventor: Samuroh Yamamoto
  • Patent number: 4265764
    Abstract: In a rotary drum vacuum filter, the drum sectors are connected by conduits to apertures in a rotary valve member on the drum which is opposed to a fixed valve member. The valve members thus control supply of vacuum (to cause suction filtering) and pressurized gas (to blow the cake of filtered material from the filter) to the drum sectors as the drum rotates. In order to eliminate the time delay between suction and blowing which is needed in order to allow the conduits to purge, another group of conduits is provided, having one-way valves adjacent their connection to the drum surface; this group is used only for blowing. The different groups of conduits are connected to apertures of the rotary valve member at different radial distances from the axis of rotation.
    Type: Grant
    Filed: May 1, 1979
    Date of Patent: May 5, 1981
    Assignee: Esmil B.V.
    Inventor: Emilio Gallottini
  • Patent number: 4256582
    Abstract: A continuous separation system which continuously purges, washes, dries, and removes solids with a minimum amount of mechanical handling and consequential crystal breakage. A separator within the continuous separation system of the present invention comprises a stationary casing, a horizontal rotary screen within the casing, a fixed scraper mounted in the casing above the screen, an inlet conduit on one side of the scraper for depositing slurry on the screen to form a layer as the screen rotates, an outlet conduit on the other side of the scraper for carrying away dried solids, and gas nozzles for directing a gas stream at the solids as they encounter the scraper, entraining them, and directing them through the outlet conduit. The screen divides the casing interior into respective upper and lower chambers that are sealed from one another except through the screen. In operation, the gas stream carries the entrained solids to a separate receiver.
    Type: Grant
    Filed: August 15, 1979
    Date of Patent: March 17, 1981
    Inventor: Joseph C. V. Ducasse
  • Patent number: 4239626
    Abstract: A filter is disclosed for removing loose particles carried in a liquid stream such as loose paper particles in a bottle washing machine. An outer tank surrounds an inner rotatable finely perforated drum mounted on an axial shaft running throughout the drum and tank. The shaft is hollow with spaced perforations and a back-wash liquid may be passed through the shaft to wash away small paper particles which may stick to the drum after an operation of the filter cycle. The contaminated liquid enters the outer tank near one end and passes along the length of the drum and through the perforated periphery thereof then out a clear discharge opening at a far end of the device.
    Type: Grant
    Filed: February 21, 1979
    Date of Patent: December 16, 1980
    Assignee: Niagara Bottle Washer Manufacturing Co.
    Inventor: Michael Vamvakas
  • Patent number: 4201674
    Abstract: In cleaning plate-type filter elements in a tank filter, the tank is opened and a cleaning tube is placed upwardly around one of the downwardly extending filter elements providing an annular flow space along the length of the element. A seal member is located in the upper end of the cleaning tube to close off the upper end of the annular flow space. Pressurized cleaning fluid is supplied into the lower end of the tube where it flows upwardly through the annular space and then into the filter element to dislodge any contamination. The material displaced continues its flow through the filter element in the same direction as is taken by the fluid being filtered.
    Type: Grant
    Filed: November 27, 1978
    Date of Patent: May 6, 1980
    Assignee: Holstein und Kappert GmbH
    Inventor: Gunther Schwinghammer
  • Patent number: 4169792
    Abstract: A water intake device comprising a substantially cylindrical rotatable screen adapted to be at least partially submerged in a body of water, means for rotating said screen, a water supply conduit communicating with the interior of said screen to receive water flowing through said screen, means for backwashing a section of said screen as said screen moves by said backwashing means so as to clear and/or remove objects or fish caught on the exterior surface of said screen and duct means associated with said backwashing means to provide or define a flow channel or path to guide and/or carry the objects or fish away from the influence or suction of the water entering said screen to said water supply conduit.
    Type: Grant
    Filed: October 13, 1977
    Date of Patent: October 2, 1979
    Inventor: William L. Dovel
  • Patent number: 4159947
    Abstract: The dewatering system includes a first endless filter belt movable along its length through an upper run, then through an arc about a dewatering drum, and then through a lower return run in a sinuous path about a plurality of rollers. A flowable aqueous material or slurry, such as sludge, is deposited on the upper surface of the belt as it moves along its upper run. A subatmospheric pressure is applied to the lower surface of the upper run of the first belt to induce the liquid to drain from the sludge. A second endless filter belt is movable into sandwiched relationship with the first belt about the sludge and moves with the first belt about the dewatering drum and about the plurality of rollers in the sinuous path of the return run.
    Type: Grant
    Filed: August 29, 1977
    Date of Patent: July 3, 1979
    Inventors: Larry L. Brooks, David A. McMillon
  • Patent number: 4146476
    Abstract: In a peeling centrifuge comprising a rotatable centrifuging drum which is surrounded by a stationary filtrate collection chamber having an outlet, and wherein the drum perforations communicate directly with that chamber, regeneration of the filter bed is effected while the drum rotates by throttling said outlet and introducing liquid to the chamber, so that liquid accumulates in the chamber and penetrates, at any instant, at least a portion of the filter bed. In one embodiment, wherein the drum axis is horizontal, only a sector of the bed in the lower region of the drum is penetrated at any time, and regeneration of the entire bed is accomplished sequentially as the drum rotates. In other embodiments, the chamber is allowed to fill with regenerating liquid to such extent that the entire bed is penetrated simultaneously. The regeneration technique may be carried out either in the terminal phase of a centrifuging operation, or after completion of centrifuging and peeling of the accumulated solids cake.
    Type: Grant
    Filed: February 14, 1978
    Date of Patent: March 27, 1979
    Assignee: Escher Wyss Limited
    Inventor: Leonhard Spiewok
  • Patent number: 4139467
    Abstract: A disc press for continuous pressing of aqueous or suspended pulp for fractionating the pulp in a liquid fraction and a dry substance fraction, comprises two plane parallel pressing discs mounted for rotation about a shaft and having strainer plates which haul the pulp therebetween by friction. The press also comprises inner and outer pressing means extending between the pressing discs and together with the latter define a curved pulp passage which in the transport direction has a varying cross section and constitutes a filling or dewatering zone, a pressing zone and a discharge zone. The passage zones of the pulp passage combined extend throughout an angle which is less than 360.degree., and the filling or dewatering zone has an approximately constant cross section. The subsequent pressing zone (B) has a uniformly decreasing cross section, the centerline of the pressing zone following an arc having an approximately constant radius about the axis of rotation.
    Type: Grant
    Filed: February 17, 1978
    Date of Patent: February 13, 1979
    Assignee: Myrens Verksted A/S
    Inventors: Bjorn H. Fritzvold, Arne Lynghjem, Oystein Johnsen, Leif H. Eriksen
  • Patent number: 4137177
    Abstract: Filtering apparatus comprising a stationary housing and a rotary filter d having a peripheral filter screen with elongated filter openings extending parallel to an axis thereof and disposed within the housing to define a space between the filter drum and the housing. A sludgy liquid supply means is provided for supplying the sludgy liquid from the inside of the filter drum onto the inner surface of the filter screen. Solid component adheres to the filter screen and liquid component passes through the elongated filter openings of the filter screen into the space, said solid component on the filter screen being discharged from the interior of the filter drum through the housing in the form of aggregations of filtration residue and said liquid component being discharged from the space through an outlet opening as filtrate.
    Type: Grant
    Filed: June 29, 1976
    Date of Patent: January 30, 1979
    Assignee: Nishihara Environmental Sanitation Research Corporation Limited
    Inventor: Yoshikazu Shoda
  • Patent number: 4097379
    Abstract: The self-cleaning filter assembly includes a collecting tank for receiving a liquid, such as the dirty wash water from a car washing installation, containing suspended or dispersed substances to be removed. The dirty wash water passes through a filter cloth and an underlying layer of a porous, resilient material disposed about the outer periphery of a hollow, perforated drum which is rotatably mounted in the collecting tank. The filtered water passing through the filter material enters the interior of the drum through the drum perforations and is discharged therefrom through the open end of a perforated hollow shaft which serves as the axle for the drum. A roller biased into rolling engagement with the outer surface of the filter cloth presses or squeezes the resilient material, causing a portion of the filtered water retained in the resilient material to be forced back through the filter cloth and dislodge separated substances collected on the filter cloth.
    Type: Grant
    Filed: October 25, 1977
    Date of Patent: June 27, 1978
    Inventor: Richard J. Shelstad
  • Patent number: 4092247
    Abstract: Process for dewatering thickened sludge comprising the steps of depositing thickened sludge onto a porous support, partially dewatering the thickened sludge by establishing a vacuum within said porous support, compressing the partially dewatered sludge on said porous support at a pressure of from 1 to 10 kp/cm.sup.2 to further dewater the sludge and to form a sludge cake, compressing the sludge cake on the porous support at a pressure of from 10 to 300 kp/cm.sup.2 to further dewater the sludge cake and discharging the dewatered sludge cake from the porous support.
    Type: Grant
    Filed: December 21, 1976
    Date of Patent: May 30, 1978
    Assignee: Aktieselskabet de Danske Sukkerfabrikker
    Inventor: Rud Frik Madsen
  • Patent number: 4076623
    Abstract: A liquid separating screen member is continuously oscillated, with an amplitude larger than the apertures in the screen member face, from a middle position with substantially the same speed in first and second opposite directions. The screen member separates liquid from the suspension of finely comminuted fiber material and the liquid, which suspension is flowing in the first direction. The oscillation prevents fiber mat build-up on the screen face during movement of the screen face either in the first or the second direction. The amplitude of oscillation may be about one-tenth of an inch, and the frequency of oscillations may be about 6 cycles/sec. with the average speed of oscillation of the screen member in both the first and second directions about 2.4 inches per second, and the maximum speed in both directions about 3.8 inches per second. The frequency of oscillation, which is below the natural frequency of the screen member and associated structures, is about at least two cycles per second.
    Type: Grant
    Filed: December 7, 1976
    Date of Patent: February 28, 1978
    Assignee: Kamyr, Inc.
    Inventor: Stefan Golston
  • Patent number: 4069154
    Abstract: A process which enables a mixture of liquid and gas, coming from a rotary vacuum filter, to be collected and simultaneously separated.The mixture of gas and liquid is passed from the filter into a vacuum box provided with a space which rotates around the axis of the filter and is generally of circular shape, in which the liquid and gas separate, the liquid is introduced into a lower fixed space generally in the shape of a circular channel, and the gas is introduced into an upper fixed space generally in the form of a circular channel, so that the liquid and gas are collected separately.The process and the apparatus of the invention are advantageously employed in circular table filters divided into filtration zones and provided with wash means, especially in the manufacture of phosphoric acid by the wet method.
    Type: Grant
    Filed: September 25, 1975
    Date of Patent: January 17, 1978
    Assignee: Rhone-Poulenc Industries
    Inventor: Michel Barloy
  • Patent number: 4062779
    Abstract: An apparatus for thickening and extracting the liquid from a sludge comprises a sludge-thickening assembly wherein solid matters in the sludge are coagulated to form coagulated flocs and the floc sludge is separated and thickened, and an assembly for extracting liquid from said floc sludge under pressure to obtain a dehydrated cake. The sludge-thickening assembly comprises coagulation means for the sludge, a first and a second screen rolls having a reticulate material covering the outer surface; and the assembly for extracting the liquid comprises an endless moving flocked filter belt, means for supporting the belt, a cylinder forced to closely contact with an upper portion of said endless moving flocked filter belt, and at least one press roll urging said endless moving flocked filter belt against said cylinder.
    Type: Grant
    Filed: July 19, 1976
    Date of Patent: December 13, 1977
    Assignee: Ichikawa Woolen Textile Co., Ltd.
    Inventors: Shoichi Nakamura, Shigeaki Sasaki
  • Patent number: 4057437
    Abstract: An endless belt gravity filtration apparatus which includes a vacuum system for removing filter cake and for cleaning and keeping filter belt porous through reverse air flow on the endless belt filter. The belt filter has extensions along each of its continuous edges, these extensions having chains which mate with sprockets on the filter chamber to assist in driving the filter belt and to keep it aligned and from being stretched or wrinkled during the filtration process. The apparatus may be used for filtering fluids such as sugar cane juice.
    Type: Grant
    Filed: June 9, 1976
    Date of Patent: November 8, 1977
    Assignee: Sparkler Mfg. Co.
    Inventor: Aloysius C. Kracklauer
  • Patent number: 4056363
    Abstract: An apparatus for the production of pure alumina from alumina and silicate containing raw materials comprising means to feed said raw material into the top of an acid resistant leaching tower; means to continuously feed a leaching liquor containing hydrochloric acid into the bottom of said leaching tower, means to continuously flow said leaching liquor upward through said raw material to leach out the alumina as a solution of aluminum chloride, means to withdraw said solution enriched in aluminum chloride toward the top of said tower zone; means to withdraw said raw material solid residue from the bottom of said tower zone to convey said solid residue from said leaching tower into a separation zone at a level higher than the level of said leaching tower; and means to separate said solid residue from said carrier liquid in said separation zone.
    Type: Grant
    Filed: February 27, 1976
    Date of Patent: November 1, 1977
    Inventor: Georg Messner
  • Patent number: 4032442
    Abstract: A method and system for use with rotary vacuum filters having a plurality of circumferentially spaced filter segments, for selectively applying blower air to the filter segments at predetermined rotational positions at which relatively unrestricted openings to the valve ports are provided to thereby blow the filter segments, and for bypassing the stream of blower air to the atmosphere when the filter segments are not blown. The apparatus for practicing the invention may also include a blow-back trap for trapping excessive amounts of residual blow-back filtrate during blowing of the filter segments.
    Type: Grant
    Filed: November 21, 1975
    Date of Patent: June 28, 1977
    Assignee: Peterson Filters and Engineering Company
    Inventor: C. Lynn Peterson
  • Patent number: 4008158
    Abstract: A dewatering machine comprises an integral and cooperative combination of a vacuum filter of the rotary drum type and an expression device of the diaphragm type. An intermittently-indexed endless filter medium belt carries a sheet of filter cake to the expression device after the cake is formed on the vacuum filter. The belt indexing action is coordinated with pressurization of the expression device so that the filter drum is indexed only when the diaphragm is relaxed and the pressurization is effected only at such times as the drum is not being indexed.
    Type: Grant
    Filed: June 19, 1975
    Date of Patent: February 15, 1977
    Assignee: Envirotech Corporation
    Inventor: Steven S. Davis
  • Patent number: 4000074
    Abstract: Primary explosives, e.g. lead azide, dispersed in a liquid medium, e.g. enol, are filtered, washed and dried in a novel centrifuge, wherein the rotatable extractor basket has an open bottom, which is closed by peripheral attachment to the large open end of an invertible funnel. The small open end of the funnel is attached to an axial shaft, which can be raised and lowered, whereby said small open end can be held upright to retain the contents in said basket and lowered to invert the funnel to discharge the dried free-flowing explosive particles by gravity through said small open end.
    Type: Grant
    Filed: September 20, 1974
    Date of Patent: December 28, 1976
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventor: Robert W. Evans
  • Patent number: 3998735
    Abstract: An apparatus provides for continuous filtration of a mother liquor and continuous removal of solids from the filter element so that the apparatus need not be shut down for cleaning or replacement of the filter element. The solids are separated from the mother liquor as a concentrated suspension and the apparatus can be replicated in stages using successively finer filters so that a filtrate free of particles above any specified particle size can be obtained.
    Type: Grant
    Filed: May 19, 1976
    Date of Patent: December 21, 1976
    Inventor: Ira M. Nathan
  • Patent number: 3997447
    Abstract: Described are fluid processing devices primarily intended for filtration but which devices may also be used for dispensing or sparging liquids and gases into a body of fluid medium. According to the method of using the disclosed devices, fluid medium to be filtered is caused to flow over the active filtering surfaces of a filter medium, such as by rotating the filter element in the fluid medium, while the fluid medium is simultaneously caused to pass through the filter element. At predetermined intervals the fluid medium flow through the filter is reversed or backpulsed.Also disclosed are porous elements of laminated structure in propeller or disc configurations which may be coated with microporous active surfaces to permit filtration of extremely small sized particles from a fluid medium or dispensing of extremely small sized bubbles of gas or droplets of liquid into a body of fluid medium.
    Type: Grant
    Filed: June 7, 1974
    Date of Patent: December 14, 1976
    Assignee: Composite Sciences, Inc.
    Inventors: Ernest J. Breton, Dexter Worden
  • Patent number: 3966611
    Abstract: In filters of the type in which a cake of solids deposited from a liquid slurry thereof on a generally horizontal filter medium is subjected to treatment involving passage of liquid through the cake while on the filter medium, means is provided for increasing the drainage rate of the formed cake by causing the cake to form on the medium from the slurry fed thereto by gravity settling in the liquor of the slurry and by removing liquor of the slurry from above the cake while the liquor still contains unsettled fine particles, such means including means providing a backflushing flow of liquid through the underside of the filter medium and the cake forming thereon into the slurry.
    Type: Grant
    Filed: December 16, 1974
    Date of Patent: June 29, 1976
    Assignee: Bird Machine Company, Inc.
    Inventors: Orville J. Gibbs, John T. Roos
  • Patent number: 3959438
    Abstract: A process for the production of pure alumina from alumina and silicate containing raw materials comprising feeding said raw material into the top of an acid resistant leaching tower; continuously feeding a leaching liquor containing hydrochloric acid into the bottom of said leaching tower, continuously flowing said leaching liquor upward through said raw material to leach out the alumina as a solution of aluminum chloride, withdrawing said solution enriched in aluminum chloride toward the top of said tower zone; withdrawing said raw material solid residue from the bottom of said tower zone to convey said solid residue from said leaching tower into a separation zone at a level higher than the level of said leaching tower; and separating said solid residue from said carrier liquid in said separation zone.Apparatus for producing alumina according to this method includes the corresponding means.
    Type: Grant
    Filed: March 21, 1974
    Date of Patent: May 25, 1976
    Inventor: Georg Messner