US3232436A - Straining apparatuses - Google Patents

Straining apparatuses Download PDF

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Publication number
US3232436A
US3232436A US171206A US17120662A US3232436A US 3232436 A US3232436 A US 3232436A US 171206 A US171206 A US 171206A US 17120662 A US17120662 A US 17120662A US 3232436 A US3232436 A US 3232436A
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United States
Prior art keywords
housing
lowermost
insert
wall portion
cylindrical wall
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Expired - Lifetime
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US171206A
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English (en)
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Nilsson Nils Gunnar Holger
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Individual
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Individual
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
    • D21D5/02—Straining or screening the pulp
    • D21D5/06—Rotary screen-drums

Definitions

  • the invention is concerned with that kind of straining apparatuses as defined in which straining of the suspension takes place through stationary, perforated screens of circular cross section under agitation of the suspension by means of rotary stirrers having winglike portions passing rather close to the one side of the screens to thereby cause pulsations in the suspension for promoting the straining.
  • Another object of the invention is to provide an improved straining apparatus of the kind referred to which may be built up from a limited number of prefabricated or standard units and which can then be adapted to meet practically any demand as regards capacity and output by suitable multiplication of some of these units without therefore requiring increased floor space or increasing rapidly in high. This is particularly valuable in installations where space is scarce and where it is desirable to increase the capacity of an apparatus which is already installed. Assembling apparatuses of various sizes from a few standard units also keeps the manufacturers costs at a minimum.
  • FIG. 1 is a sectional elevation of a straining apparatus and FIG. 2 is a horizontal section taken along line 2-2 in FIG. 1.
  • the straining apparatus shown consists of a lower base structure, which is provided with a central hub portion 1 supporting in suitable bearings a vertical stirrer shaft 2, the lower end of which carries a pulley or wheel 3 which is intended to be driven through a suitable transmission by a motor (not shown).
  • the base structure 1 may alternatively enclose an electric driving motor, the output shaft of which could then be directly extended upwards through hub 1 to constitute the stirrer shaft 2.
  • the base structure 1 has along its upper outer edge an annular flange 1", which carries a bottom section 4 of the straining apparatus.
  • This bottom section 4 has the 3,232,436 Patented Feb. I, 1966 shape of an inverted bowl with a stuffing-box 5 for the passage of the stirrer shaft 2 in its centre and an upwardly directed confining wall portion along its circumference.
  • This latter wall portion forms the lower part of the cylindrical outer casing of the apparatus and is provided with at least one outlet 6.
  • the base structure 1 as well as the bottom section 4 are used with all sizes of the apparatus shown, and on the rim of the bottom section 4 there are mounted a number of intermediate sections 7, all of which are identical and substantially cylindrical in shape.
  • intermediate sections 7 In the drawing there are piled two such sections 7 on top of each other to form the outer casing of the apparatus, but it will be readily understood that the number of such sections may be less or greater dependent on the desired size and capacity of the apparatus to be built.
  • the intermediate sections 7 may also be entirely omitted when a minimum size of the apparatus is desirable.
  • Each intermediate section 7 is provided with upper outlets 6', 6" respectively corresponding to the said outlet 6 in the bottom section 4 and intended for the discharge of the residue, and also with outlets 8, 8', respectively, which are placed somewhat lower than the outlets 6', 6" and intended for the discharge of the liquid suspended material that has passed through the screen of the related section of the apparatus.
  • the outer casing of the apparatus comprises a top section 9 which has also the shape of an inverted bowl and which is provided with a detachable top lid 10 giving access to the interior of the apparatus for inspection and like purposes as well as with a tangentially directed inlet 11 for the suspension to be treated.
  • the top section 9, which, if desired, may be placed directly on the bottom section 4 without intermediate sections 7 in case a minimum size apparatus is to be assembled has near its lower edge an outlet 8" corresponding to the outlets 8, 8' of the inter mediate sections 7.
  • a strainer chamber insert generally designated by numeral 12 and consisting of a hollow frustoconical, perforated screen 13, the lower, wider end edge of which is secured to a ring 14 interposed with a sealing fit between adjacent ones of the piled botom and casing sectionsas the case may beto keep the inserts in place.
  • the upper, narrower inlet end edge of each screen 13 is in turn secured to a ring 15, which forms a reinforcing support and attachment for the upper edge of a likewise frusto-conical but unperforated cap 16 extending downwards over the outside of the screen 13 at some distance from the latter.
  • each screen 13 will have its lower edge located directly above its related outlet 6, 6 or 6" and directly below its related outlet 8, 8 or 8", while the lower edge of each cap 16 will seal against the outer casing directly above each of said related outlets 8, 8 and 8" respectively and thus be located directly below the next higher outlet 6 and 6" respectively, when the apparatus includes one or more intermediate sections 7, and will in all cases form a conical bottom member in the top casing section 9.
  • the annular space left between each screen 13 and its related cap 16 of each inset 12 will thus be in free communication with one of the outlets 8, 8 or 8".
  • the shaft 2 extends centrally through the apparatus and carries a number of stirrers in the form of groups of spoke-like arms 17 spaced vertically from each other by spacing sleeves 18.
  • Each arm 17 is substantially T- shaped and carries at its outer ends in an adjustable manner well known per so at wing-like impeller member 19,
  • outlets 6,- 6' and 6" may as well as the outlets 8, 8' and 8", of course, be interconnected to discharge their respective materials into each a common collector conduit.
  • each upper screen 13 may have its lower edge sealing against the housing at a level below the upper edge of the screen next below. This is possible because the caps 16 are also tapering upwardly.
  • the cap 16 of the upper insert 12 in the housing forms an annular bottom within the top section 9 of the apparatus, over the raised inner edge of which the suspension is forced to flow in radially inwards direction to enter from the inlet 11 to the different screens 13.
  • this overflow action will cause any larger impurities to collect already in the upper compartment of the apparatus.
  • a straining apparatus for liquid suspensions comprising a housing including an upwardly convex bottom portion, a top portion and a substantially cylindrical wall portion therebetween;
  • each insert including a frusto-conical, open-ended perforated screening member arranged with its relatively large diameter end lowermost and in sealing engagement with said cylindrical wall portion of the housing, and a Efrusto-conical, open-ended cap member also arranged with its relatively large diameter end lowermost, said cap member having its upper end edge in sealing engagement with the upper end edge of the related screening member and flaring radially outward from the latter, said lowermost end of said cap member being in sealing engagement with said cylindrical wall portion of the housing and being spaced vertically upward from the lowermost end of the related screening member;
  • impeller member on the outer end of each of said arms extending parallel to the generatrix of the related frusto-conical screening member and being closely adjacent to the inner surface of the latter so that, when said shaft is rotated and a liquid suspension is introduced at said inlet, the impellers produce pulsations inthesuspension in directions toward and away from the related screen member.
  • a straining apparatus as in claim 3; wherein said housing has separable lower and upper sections forming said bottom and top portions, respectively, and parts of said cylindrical wall portion; and wherein said housing further has an intermediate section interposed between said lower and upper sections for each insert more than one disposed in said housing and also forming part of said cylindrical wall port-ion; and
  • said part of the cylindrical wall portion formed by said lower section has said lower outlet for the lowermost of said inserts in the housing
  • said part of the cylindrical wall portion formed by said upper section has said upper outlet for the uppermost of said inserts
  • said intermediate section has the upper outlet for one of said inserts and the lower outlet for the next higher insert.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Centrifugal Separators (AREA)
US171206A 1961-02-09 1962-02-05 Straining apparatuses Expired - Lifetime US3232436A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE1331/61A SE308445B (fr) 1961-02-09 1961-02-09

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US3232436A true US3232436A (en) 1966-02-01

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SE (1) SE308445B (fr)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3303525A (en) * 1963-10-14 1967-02-14 Exxon Research Engineering Co Pipeline pig retriever
US3387708A (en) * 1966-01-24 1968-06-11 Beloit Corp Paper machine screen
US3399772A (en) * 1966-02-14 1968-09-03 Beloit Corp Duplex pulp screen
US3420373A (en) * 1966-04-01 1969-01-07 Allen Bruce Hunter Pulp screens
US3519130A (en) * 1966-09-21 1970-07-07 Waclaw Jachna Apparatus for classifying of finegrained solids in wet condition
US3731814A (en) * 1967-11-27 1973-05-08 Brown C Liquid filter
US3774761A (en) * 1971-03-02 1973-11-27 A Wikdahl Process and apparatus for filtering cellulose fiber suspensions
US3865243A (en) * 1972-06-21 1975-02-11 Yhtyneet Paperitehtaat Oy Pressure strainer device
US3898157A (en) * 1973-03-23 1975-08-05 Hooper & Co Ltd S W Two stage pressure pulp screen device with stationary cylindrical screen
US4127479A (en) * 1973-11-08 1978-11-28 J. M. Voith G.M.B.H. Apparatus for straining suspensions
US4514300A (en) * 1982-08-16 1985-04-30 Centrum Mechanizacji Gornictwa "Komag" Dehydrating centrifugal sieve
US4569759A (en) * 1983-03-24 1986-02-11 Societe Lyonnaise Des Eaux Et De L'eclairage Tangential filtration apparatus and plant comprising such apparatus
DE3606447A1 (de) * 1985-03-04 1986-09-04 Kamyr Ab, Karlstad Siebvorrichtung
US4619761A (en) * 1984-12-20 1986-10-28 Koppers Company, Inc. Method for screening or fractionation
EP0312273A2 (fr) * 1987-10-13 1989-04-19 A. Ahlstrom Corporation Procédé et dispositif pour le traitement d'une suspension de fibres
US5391294A (en) * 1991-03-28 1995-02-21 Codiex (S.N.C.) Particle separator device with circulation of fluid, with double effect of extraction
JP2002541340A (ja) * 1999-03-29 2002-12-03 バルメツト・フアイバーテツク・アクテイエボラーグ ２個のスクリーン手段を含むスクリーニング装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE511786C2 (sv) 1998-03-06 1999-11-22 Sunds Defibrator Ind Ab Silanordning med två silkammare för separering av fibersuspensioner

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE619419C (de) * 1935-09-30 Hermann Dietz Sichter
US2975899A (en) * 1957-04-16 1961-03-21 Bird Machine Co Screening device
FR1257923A (fr) * 1960-04-26 1961-04-07 Ingersoll Rand Canada Appareil de filtrage de suspensions

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE619419C (de) * 1935-09-30 Hermann Dietz Sichter
US2975899A (en) * 1957-04-16 1961-03-21 Bird Machine Co Screening device
FR1257923A (fr) * 1960-04-26 1961-04-07 Ingersoll Rand Canada Appareil de filtrage de suspensions

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3303525A (en) * 1963-10-14 1967-02-14 Exxon Research Engineering Co Pipeline pig retriever
US3387708A (en) * 1966-01-24 1968-06-11 Beloit Corp Paper machine screen
US3399772A (en) * 1966-02-14 1968-09-03 Beloit Corp Duplex pulp screen
US3420373A (en) * 1966-04-01 1969-01-07 Allen Bruce Hunter Pulp screens
US3519130A (en) * 1966-09-21 1970-07-07 Waclaw Jachna Apparatus for classifying of finegrained solids in wet condition
US3731814A (en) * 1967-11-27 1973-05-08 Brown C Liquid filter
US3774761A (en) * 1971-03-02 1973-11-27 A Wikdahl Process and apparatus for filtering cellulose fiber suspensions
US3865243A (en) * 1972-06-21 1975-02-11 Yhtyneet Paperitehtaat Oy Pressure strainer device
US3898157A (en) * 1973-03-23 1975-08-05 Hooper & Co Ltd S W Two stage pressure pulp screen device with stationary cylindrical screen
US4127479A (en) * 1973-11-08 1978-11-28 J. M. Voith G.M.B.H. Apparatus for straining suspensions
US4514300A (en) * 1982-08-16 1985-04-30 Centrum Mechanizacji Gornictwa "Komag" Dehydrating centrifugal sieve
US4569759A (en) * 1983-03-24 1986-02-11 Societe Lyonnaise Des Eaux Et De L'eclairage Tangential filtration apparatus and plant comprising such apparatus
US4619761A (en) * 1984-12-20 1986-10-28 Koppers Company, Inc. Method for screening or fractionation
DE3606447A1 (de) * 1985-03-04 1986-09-04 Kamyr Ab, Karlstad Siebvorrichtung
EP0312273A2 (fr) * 1987-10-13 1989-04-19 A. Ahlstrom Corporation Procédé et dispositif pour le traitement d'une suspension de fibres
EP0312273A3 (en) * 1987-10-13 1990-05-23 A. Ahlstrom Corporation Method and apparatus for treating fiber suspension
US5391294A (en) * 1991-03-28 1995-02-21 Codiex (S.N.C.) Particle separator device with circulation of fluid, with double effect of extraction
JP2002541340A (ja) * 1999-03-29 2002-12-03 バルメツト・フアイバーテツク・アクテイエボラーグ ２個のスクリーン手段を含むスクリーニング装置
JP4832648B2 (ja) * 1999-03-29 2011-12-07 バルメツト・フアイバーテツク・アクテイエボラーグ ２個のスクリーン手段を含むスクリーニング装置

Also Published As

Publication number Publication date
SE308445B (fr) 1969-02-10

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