EP0280094B1 - Segment pour filtre pour l'épaississement d'une suspension de fibres - Google Patents

Segment pour filtre pour l'épaississement d'une suspension de fibres Download PDF

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Publication number
EP0280094B1
EP0280094B1 EP88101672A EP88101672A EP0280094B1 EP 0280094 B1 EP0280094 B1 EP 0280094B1 EP 88101672 A EP88101672 A EP 88101672A EP 88101672 A EP88101672 A EP 88101672A EP 0280094 B1 EP0280094 B1 EP 0280094B1
Authority
EP
European Patent Office
Prior art keywords
screen
segment
sieve
frame
filter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP88101672A
Other languages
German (de)
English (en)
Other versions
EP0280094A2 (fr
EP0280094A3 (en
Inventor
Siegfried Hauff
Waldemar Schäfer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Finckh Fiber Systems GmbH and Co KG
Original Assignee
Hermann Finckh Maschinenfabrik GmbH and Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hermann Finckh Maschinenfabrik GmbH and Co filed Critical Hermann Finckh Maschinenfabrik GmbH and Co
Priority to AT88101672T priority Critical patent/ATE54967T1/de
Publication of EP0280094A2 publication Critical patent/EP0280094A2/fr
Publication of EP0280094A3 publication Critical patent/EP0280094A3/de
Application granted granted Critical
Publication of EP0280094B1 publication Critical patent/EP0280094B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/18—De-watering; Elimination of cooking or pulp-treating liquors from the pulp
    • 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
    • D21D5/04—Flat screens
    • D21D5/046—Rotary screens
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S264/00—Plastic and nonmetallic article shaping or treating: processes
    • Y10S264/48—Processes of making filters

Definitions

  • the invention relates to a sector-shaped screen segment for rotating disc filters or folded screen thickeners for thickening fiber suspensions.
  • the roller is composed of several disc-shaped units, which are mounted on a common, rotatably mounted and driven support tube and each consist of several, along radii adjacent sector-shaped screen segments, which are covered with the screen fabric on the outside, the sieve carrier, which defines a cavity, defines the end faces of the filter discs.
  • rake-like scrapers are arranged on the trough above the fiber suspension to be filtered, which form a kind of slide on which the detached from the filter disks Slide layers of fiber to a location outside the trough.
  • the detachment of the fiber layers from the sieve is facilitated by providing a spray tube above the disc filter, with the aid of which the fiber layers are sprayed off from the sieve and thereby detached.
  • the sieve segments have a type of frame with two lateral limbs running in the radial direction and one outer limb in the circumferential direction, and the sieve carriers arranged at a distance from one another in the axial direction consist of a welded wire mesh on which a plastic sieve fabric rests.
  • the sieve carriers consist of perforated plates provided with holes of relatively large diameter.
  • the invention is based on the object of creating a simple and inexpensive to produce sector-shaped sieve segment (in the side view the known sieve segments described have approximately the shape of a circular sector with a cut-off tip) for rotating disc filters or folded sieve thickeners for thickening fiber suspensions, in which the sieve Even if it is not designed as a perforated plate fastened to the support structure, it is subject to less wear than in the case of known sector-shaped sieve segments with a sieve movable relative to the sieve carriers.
  • a known sieve segment (US Pat. No. 4,077,887) is assumed to enable simple and therefore inexpensive production, which has a frame that has a radially outer leg and one on each of its two sides, in particular in the radial direction has lateral legs, to which two sieve carriers are attached, the sieve supports arranged at a distance from one another in the axial direction and, together with one sieve lying on them, which form the two main surfaces of the sieve segment, both the sieve carrier and the frame legs being formed as castings, and according to the invention it is proposed to solve the problem, to embed the sieve in the frame legs and the sieve carriers.
  • This embedding in the portafilter advantageously takes place in such a way that the material of the portafilter does not protrude beyond the outside of the sieve fabric.
  • the production of the sieve segment according to the invention becomes particularly simple when the sieve carriers are cast onto the frame legs.
  • each sieve segment has a frame made up of a radially outer leg and two lateral, radially extending legs and two filter holders, and a filter bag is drawn from a filter fabric over the frame and the filter holder.
  • the frame legs are divided along a central plane of the sieve segment running perpendicular to the axis of rotation of the disc filter, and each half of the frame is formed together with one of the sieve carriers as a one-piece casting.
  • the sieve segment halves produced in this way can then be glued, welded, screwed or simply attached to one another in some other way, screw connection being preferred because a damaged or worn sieve segment or sieve segment half can then be replaced particularly easily and quickly, as a result of which the disk filter is idle or folded screen thickener can be shortened.
  • the cast parts could be metal die cast or injection molded parts.
  • the sieve segments according to the invention become particularly cheap and light when the cast part is designed as a plastic injection molded part.
  • any suitable material can be used for the sieve, but a fabric made of stainless steel wires or plastic threads or wires is particularly recommended.
  • each sieve carrier as a grid formed by rods and to arrange the rods in particular so that they run radially and in the direction of rotation, the rods running in the direction of rotation then being opposite the rods running in the radial direction are set back in the direction of the segment interior and the sieve is only embedded in the radially extending rods, since the sieve fabric surfaces then become particularly dimensionally stable due to the small distance between the supports supporting the sieve.
  • the disc filter screen segment shown in FIGS. 1 to 3 essentially consists of two screen fabric cut parts 10 and two half shells 12, 14 designed as one-piece cast parts, each of which forms a screen support 16 and a frame half 18.
  • the two frame halves together form an outer frame leg 20 in the radial direction and two lateral frame legs 22 extending in the radial direction and are firmly connected to one another along this frame leg by means of screws 24 and threaded bores 26, 12 recesses 28 being provided in the half shell for receiving the screw heads .
  • the frame halves of the sieve segment according to the invention are closed and therefore also have an inner frame leg 30, whereby, as can be seen in FIG. 2, the two halves of this inner frame leg are arranged at a distance from one another in the axial direction To allow the filtrate to flow into a sieve segment carrier.
  • the sieve carriers 16 consist of radial rods 32 and transverse rods 34, which are integrally connected to one another and the frame halves 18, since the entire frame halves each form a single casting, in particular a plastic injection molded part.
  • the cross bars 34 are set back in relation to the radial bars 32 in the direction of the interior of the sieve segment, as can be clearly seen in FIG. 2, while the outer end faces of the radial bars 32 are aligned with the outer end faces of the frame halves 18 according to the invention. Since the cross bars 34, as can also be seen in FIG.
  • Each of the sieve fabric cut parts 10 is now, according to the invention, embedded in the sieve supports formed by the outer end faces of the frame legs 20, 22, 30 and the radial rods 32 at least over part of the thickness of the sieve, but preferably over the entire sieve thickness, such as this FIG. 3 shows one of the radial rods 32 and one of the fabric sections 10 in section; this section also shows that, in the preferred embodiment of the sieve segment according to the invention, the material of the supporting structure does not protrude outward beyond the outermost elevations of the sieve or sieve fabric.
  • the two frame halves can now be produced particularly easily and cheaply as plastic injection-molded parts, with a sieve fabric blank 10 being inserted into the injection mold and then the frame half being injected, the sieve fabric being embedded in the plastic forming the frame half and thus on the frame and on Filter holder is anchored.
  • the screen segment shown in FIGS. 4 and 5 differs from a folded screen thickener essentially only in that the radial extension of the frame and the screen support is smaller than in the case of a disc filter screen segment, the elements of the second embodiment corresponding to the first embodiment have been given the same reference numerals as in Figures 1 to 3, but with the addition of a dash, so that a description of the details shown in Figures 4 and 5 is unnecessary.
  • the bars of the two frame halves that do not support the screen fabric are arranged and dimensioned such that they abut against one another on the one hand (see FIGS. 2 and 5), which increases the stability of the screen segment, and between the edges of the screen segment facing outwards Rods and the sieve fabric still a relatively large flow cross-section remains for the filtrate.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Filtering Materials (AREA)
  • Filtration Of Liquid (AREA)
  • Paper (AREA)
  • Inorganic Fibers (AREA)
  • Nonwoven Fabrics (AREA)
  • Oscillators With Electromechanical Resonators (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)

Claims (9)

1. Segment filtrant en forme de secteur pour filtres à disques rotatifs ou épaississeurs à surface filtrante plissée pour l'épaississement de suspensions de fibres, comprenant un cadre (20, 22, 30) qui comprend une branche radialement extérieure (20) et, le long de chacun de ses deux côtés qui s'étendent en particulier dans une direction radiale, une branche latérale (22), à laquelle sont fixés deux supports de surface filtrante (16) qui forment des portées de surface filtrante disposées à distance l'une de l'autre dans la direction axiale et qui, en combinaison avec une surface filtrante (10) appuyée sur ces portées, forment les deux surfaces principales du segment filtrant, et où aussi bien les supports de surface filtrante (16) que les branches (20, 22, 30) du cadre sont constituées par des pièces moulées, caractérisé en ce que la surface filtrante (10) est ennoyée dans les branches (20, 22, 30) du cadre et dans les supports de surface filtrante (16).
2. Segment filtrant selon la revendication 1, caractérisé en ce que les supports de surface filtrante (16) sont venus de moulage le long des branches (20, 22, 30) du cadre.
3. Segment filtrant selon la revendication 2, caractérisé en ce que les branches (20, 22, 30) du cadre sont divisées le long d'un plan médian du segment filtrant qui s'étend perpendiculairement à l'axe de rotation et en ce que le demi-cadre (18) forme, en combinaison avec le support de surface filtrante (16) d'un demi-segment, une pièce moulée d'un seul tenant, en forme de demi-coquille.
4. Segment filtrant selon une ou plusieurs des revendications précédentes, caractérisé en ce que la pièce moulée est une pièce en matière plastique moulée par injection.
5. Segment filtrant selon une ou plusieurs des revendications précédentes, caractérisé en ce que la surface filtrante (10) est un tissu fait de fils d'acier inoxydable.
6. Segment filtrant selon une ou plusieurs des revendications 1 à 4, caractérisé en ce que le filtre (10) est un tissu de fils de matière synthétique.
7. Segment filtrant selon la revendication 3, caractérisé en ce que les deux demi-coquilles (16, 18) sont assemblées l'une à l'autre de long des branches (20, 22, 30) du cadre par des vis (24).
8. Segment filtrant selon une ou plusieurs des revendications 1 à 7, caractérisé en ce que chaque support de surface filtrante (16) est constitué par une grille composée de barreaux (30, 32).
9. Segment filtrant selon la revendication 8, caractérisé en ce que les barreaux (32, 34) s'étendent radialement et transversalement à la direction radiale, en ce que les barreaux transversaux (34) sont en retrait vers l'intérieur du segment par rapport aux barreaux (32) qui s'étendent dans la direction radiale, et en ce que la surface filtrante (10) est ennoyée uniquement dans les barreaux (32) qui s'étendent radialement.
EP88101672A 1987-02-27 1988-02-05 Segment pour filtre pour l'épaississement d'une suspension de fibres Expired - Lifetime EP0280094B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88101672T ATE54967T1 (de) 1987-02-27 1988-02-05 Siebsegment fuer filter zum eindicken von fasersuspensionen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3706402A DE3706402C1 (de) 1987-02-27 1987-02-27 Siebsegment fuer Filter zum Eindicken von Fasersuspensionen
DE3706402 1987-02-27

Publications (3)

Publication Number Publication Date
EP0280094A2 EP0280094A2 (fr) 1988-08-31
EP0280094A3 EP0280094A3 (en) 1989-03-01
EP0280094B1 true EP0280094B1 (fr) 1990-07-25

Family

ID=6321947

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88101672A Expired - Lifetime EP0280094B1 (fr) 1987-02-27 1988-02-05 Segment pour filtre pour l'épaississement d'une suspension de fibres

Country Status (7)

Country Link
US (1) US4950403A (fr)
EP (1) EP0280094B1 (fr)
JP (1) JP2645057B2 (fr)
AT (1) ATE54967T1 (fr)
CA (1) CA1324344C (fr)
DE (2) DE3706402C1 (fr)
FI (1) FI85341C (fr)

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US5254250A (en) * 1991-05-30 1993-10-19 Membrex, Inc. Rotary filtration device and filter pack therefor
US5679249A (en) * 1991-12-24 1997-10-21 Pall Corporation Dynamic filter system
AT401069B (de) * 1993-06-23 1996-06-25 Leripa Kunststoff Gmbh & Co Kg Randabdichtung für entwässerungselemente
US6117322A (en) * 1993-06-23 2000-09-12 Pall Corporation Dynamic filter system
AT403064B (de) * 1995-09-15 1997-11-25 Andritz Patentverwaltung Scheibenfilter zum abtrennen von flüssigkeiten aus einer suspension, insbesondere faserstoffsuspension
US5707517A (en) * 1995-11-27 1998-01-13 Membrex, Inc. Immersible rotary disc filtration device
RU2165803C2 (ru) 1996-08-20 2001-04-27 Бюлер Аг Плоское сито
US5766472A (en) * 1996-10-29 1998-06-16 Illinois Tool Works Inc. Method and apparatus for a filter assembly
DE19706601C1 (de) * 1997-02-20 1998-11-12 Buehler Ag Siebrahmen für Plansichter und Verfahren zu dessen Herstellung
DE69827046T2 (de) * 1997-03-01 2005-03-03 United Wire Ltd. Einrichtung zum Reparieren oder Aufbereiten eines Filtersiebes
US5993674A (en) * 1998-02-24 1999-11-30 Membrex, Inc. Rotary disc filtration device with means to reduce axial forces
DE29815098U1 (de) 1998-08-22 1998-11-05 Schwarzkopf, Josef, 94508 Schöllnach Filtereinrichtung
US6305549B1 (en) * 1999-07-06 2001-10-23 Southwestern Wire Cloth, Inc. Vibrating screen assembly of dissimilar materials
US20010050250A1 (en) 1999-09-14 2001-12-13 Olli Hognabba Corrosion-resistant filter element
SE526692E (sv) 2003-02-27 2013-07-16 Veolia Water Solutions & Tech Modul för uppbyggnad av skivfilter
AT412259B (de) * 2003-06-04 2004-12-27 Andritz Ag Maschf Verfahren zum herstellen eines sektorförmigen filterelements und filterelement
US20050027006A1 (en) 2003-07-28 2005-02-03 Reuben Matalon Methods and materials for treating conditions associated with metabolic disorders
WO2007061447A2 (fr) * 2005-11-15 2007-05-31 Sefar Filtration Inc. Cadre de tamis jetable prealablement tendu et procede de fabrication correspondant
EP1872843A1 (fr) * 2006-06-26 2008-01-02 Hydrotech Veolia Water Systems Aktiebolag Cadre pour un filtre à disques
EP2051791B1 (fr) 2006-08-14 2014-10-08 Evoqua Water Technologies LLC Filtre en forme de disque à débit élevé
US8118175B2 (en) 2007-07-18 2012-02-21 Siemens Industry, Inc. Venting device for a disc filter
US8801929B2 (en) * 2007-07-18 2014-08-12 Evoqua Water Technologies Llc Trash tolerant filter support for a disc filter
US8894856B2 (en) * 2008-03-28 2014-11-25 Evoqua Water Technologies Llc Hybrid aerobic and anaerobic wastewater and sludge treatment systems and methods
KR20100136989A (ko) * 2008-03-28 2010-12-29 지멘스 워터 테크놀로지스 코포레이션 호기성 및 혐기성 하이브리드 폐수 및 슬러지 처리 시스템 및 방법
US9359236B2 (en) 2010-08-18 2016-06-07 Evoqua Water Technologies Llc Enhanced biosorption of wastewater organics using dissolved air flotation with solids recycle
SE535159C2 (sv) * 2010-09-02 2012-05-02 Veolia Water Solutions & Tech Förfarande för att tillverka ett filtersegment till ett skivfilter samt filtersegmentet
CN102614703A (zh) * 2011-01-31 2012-08-01 江苏博思达环保科技有限公司 转盘过滤器用盘片
WO2013032958A1 (fr) * 2011-08-29 2013-03-07 Karl Gabrielsson Segment filtrant à structure légère
DE102012222400B4 (de) 2012-12-06 2025-06-26 BSH Hausgeräte GmbH Scheibenfilterplatte mit Trägerelement
AU2014262972B2 (en) 2013-05-06 2017-09-28 Evoqua Water Technologies Llc Wastewater biosorption with dissolved air flotation
CN114405122B (zh) 2014-06-05 2024-05-24 懿华水处理技术有限责任公司 过滤板以及制作过滤板的方法
JP6618554B2 (ja) * 2015-07-03 2019-12-11 ガウドフリン 漸進的厚みを有するセクター
ES2927357T3 (es) 2016-08-12 2022-11-04 Evoqua Water Tech Llc Filtro de disco de medios dobles prepantallla de filtro de disco
US11255046B2 (en) * 2016-10-17 2022-02-22 Andritz Oy Screen assembly for pulp digesters and other treatment vessels in pulp production
SE540721C2 (en) 2017-06-02 2018-10-23 Nordic Water Prod Ab Filter element for use in a filter disc
CN107227649A (zh) * 2017-06-13 2017-10-03 太仓市宇航造纸机械厂 一种造纸用双层过滤网
US11000791B2 (en) * 2019-03-06 2021-05-11 Veolia Water Solutions & Technologies Support Rotary disc filter having backwash guides
US12220657B2 (en) * 2021-04-30 2025-02-11 Pall Corporation Filter disk segments

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US1767078A (en) * 1927-11-29 1930-06-24 Johnson John Screen for filter presses
US4077887A (en) * 1977-05-17 1978-03-07 Sigmund Coll Langvik Filter disc for vacuum filter system

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US1746409A (en) * 1926-12-06 1930-02-11 Oliver United Filters Inc Filter leaf
US2444147A (en) * 1945-03-15 1948-06-29 Air Maze Corp Liquid filter element
US2682205A (en) * 1949-06-28 1954-06-29 Bertram J Vincent Screen plate for papermaking machines
US2964194A (en) * 1957-04-17 1960-12-13 Dorr Oliver Inc Filter construction
US3610419A (en) * 1969-06-09 1971-10-05 Improved Machinery Inc Filter leaf
US3679061A (en) * 1970-06-15 1972-07-25 Envirotech Corp Molded filter leaf
US3917534A (en) * 1974-04-17 1975-11-04 Plastic Tech Inc Filter sector
FR2375893A1 (fr) * 1976-12-31 1978-07-28 Eurogest Boitier pour filtre a air, et filtre a air equipe d'un tel boitier
US4330405A (en) * 1980-09-29 1982-05-18 Davis Kent L Vacuum disc filter
NL8400662A (nl) * 1984-03-01 1985-10-01 Amafilter Bv Schijfvormig filterelement.
SE453158B (sv) * 1985-02-20 1988-01-18 Bjarne Nilsson Skivfilterelement for ett roterbart skivfilter

Patent Citations (2)

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Publication number Priority date Publication date Assignee Title
US1767078A (en) * 1927-11-29 1930-06-24 Johnson John Screen for filter presses
US4077887A (en) * 1977-05-17 1978-03-07 Sigmund Coll Langvik Filter disc for vacuum filter system

Also Published As

Publication number Publication date
EP0280094A2 (fr) 1988-08-31
JPS63219691A (ja) 1988-09-13
DE3706402C1 (de) 1988-07-07
FI85341C (fi) 1992-04-10
FI880649L (fi) 1988-08-28
JP2645057B2 (ja) 1997-08-25
FI85341B (fi) 1991-12-31
EP0280094A3 (en) 1989-03-01
US4950403A (en) 1990-08-21
DE3860346D1 (de) 1990-08-30
ATE54967T1 (de) 1990-08-15
CA1324344C (fr) 1993-11-16
FI880649A0 (fi) 1988-02-12

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