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WO1997035656A1 - Unite de filtre - Google Patents

Unite de filtre Download PDF

Info

Publication number
WO1997035656A1
WO1997035656A1 PCT/SE1997/000391 SE9700391W WO9735656A1 WO 1997035656 A1 WO1997035656 A1 WO 1997035656A1 SE 9700391 W SE9700391 W SE 9700391W WO 9735656 A1 WO9735656 A1 WO 9735656A1
Authority
WO
WIPO (PCT)
Prior art keywords
attachment strip
frame
filter cloth
filter
side portions
Prior art date
Application number
PCT/SE1997/000391
Other languages
English (en)
Inventor
Paul Cameron
Original Assignee
Alfa Laval Ab
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 Alfa Laval Ab filed Critical Alfa Laval Ab
Publication of WO1997035656A1 publication Critical patent/WO1997035656A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/15—Filters with filtering elements which move during the filtering operation with rotary plane filtering surfaces
    • B01D33/21—Filters with filtering elements which move during the filtering operation with rotary plane filtering surfaces with hollow filtering discs transversely mounted on a hollow rotary shaft
    • B01D33/23—Construction of discs or component sectors thereof

Definitions

  • the present invention relates to a filter unit for use in a rotary disc filter, comprising a frame defining a hole, and a filter cloth extending in the hole and being connected to the frame.
  • the invention also relates to a method of fabri ⁇ cating such a filter unit.
  • WO 94/19088 discloses filter units of this kind, which are releasably connected to a rotary disc filter. If one or more of the filter cloths of the disc filter would be damaged, the filter units having such damaged filter cloths can easily and quickly be exchanged for new filter units.
  • the filter units have to be substantially plane to enable a quick mounting on the disc filter, since the filter units are mounted by sliding each filter unit in place so that the frame engages groove shaped holding members. The frame should therefore not be bent in the direction perpendicular to the filter cloth. In addition, sealing problems may arise if the frame is bent in this manner.
  • filter cloths and frames are made of a metallic material, such as acid-proof steel.
  • a metallic material such as acid-proof steel.
  • the filter cloths have been spot welded on the frames.
  • filter cloths of plastic material have been glued onto frames of metal.
  • such glued filter units have proved unsuitable for warm and corrosive liquid mixtures, such as pulp suspensions, since the glue may be dissolved so that the filter cloths are released from the frames.
  • An object of the present invention is to provide a substantially plane filter unit which is durable when exposed to warm and corrosive liquid mixtures. Another object of the invention is to provide a simple and rapid method of fabricating the filter unit.
  • a filter unit of the kind initially stated which is characterized in that an attachment strip of a flexible stitchable material extends along the frame and is wrapped around the latter, and that the filter cloth is united to the attachment strip by means of at least one thread seam.
  • the filter unit preferably is produced by forming the frame so that it defines a hole in which the filter cloth is arranged. Then, the attachment strip is wrapped around the frame and is stitched on the filter cloth.
  • the attachment strip is dimen ⁇ sioned and wrapped around the frame such that two opposite side portions of the attachment strip extend a distance from the frame in the hole, and the filter cloth is united with the side portions of the attachment strip by means of the thread seam.
  • the side portions of the attachment strip and the filter cloth may be arranged edge to edge and the thread seam may form a zigzag path, which alternately crosses said edges.
  • a rim of the filter cloth is suitably overlapped by the opposite side portions of the attachment strip, the thread seam uniting said rim with the side portions of the attachment strip, which results in a simple production of the filter unit.
  • the two opposite side portions of the attachment strip have two edges which may be aligned on the filter cloth. This allows the thread seam to form a zigzag path which alter- nately crosses said two edges.
  • the edges of the side portions of the attachment strip can be kept pressed against the filter cloth so that particles can not pene ⁇ trate in between the filter cloth and the attachment strip.
  • the opposite side portions of the attachment strip are advantageously stitched to the rim of the filter cloth by stitching a first thread seam along the frame, for instance in a zigzag path which alternately crosses the two edges of the side portions of the attachment strip, whereafter the filter cloth is stretched by stitching a second thread seam along the frame between the first thread seam and the frame.
  • non-shrinkable filter cloths for instance made of acid-proof steel, may be stretched.
  • the attachment strip may be chosen from heat shrinkable materials, which means that when the attachment strip and the filter cloth have been stitched together the attachment strip can be shrinked by exposing the strip to heat so that the filter cloth is stretched.
  • figure 1 shows parts of a filter unit according to the invention
  • figure 2 shows a complete filter unit according to the invention
  • figure 3 shows a section along the line III-III in figure 2
  • figure 4 shows a modification of the embodiment according to figure 3
  • figure 5 shows an attachment strip for the filter unit according to the invention.
  • FIG 1 there are shown parts of a filter unit accor ⁇ ding to the invention, comprising a frame 1, which defines a hole 2 and which has the shape of a truncated circular sector, and a filter cloth 3, which is placed in the hole 2 of the frame 1.
  • the filter cloth 3 is cut out in accordance with the shape of the frame 1 but is somewhat smaller than the hole 2.
  • the frame 1 is made of a metallic material, preferably acid proof steel.
  • the filter cloth in this case is made of acid proof steel but may also be made of a shrinkable plastic material, for instance polypropylene.
  • FIG 2 there is shown a complete filter unit 4 according to the invention comprising an attachment strip 5 of a heat shrinkable felt material, preferably a polymer, e.g. polypropylene, which is wrapped around the frame 1 and united with the filter cloth 3 by means of two thread seams 6,7, extending spaced apart from each other along the circumference of the filter cloth 3.
  • the attachment strip 5 is provided with notches 8 (see Fig 5) in order to fit the corners of the frame 1.
  • the opposite short end edges 9, 10 of the attachment strip 5 are stitched together edge to edge by means of a thread seam 11.
  • Two opposite side portions 12,13 of the attachment strip 5 extend a distance from the frame 1 in the hole 2 and overlap a rim 14 of the filter cloth 3, the edges 15,16 of the side portions 12,13 being aligned at mutual sides of the filter cloth (see Fig. 3) .
  • the farther thread seam 6 as seen from the frame 1 forms a zigzag path which alternately crosses the edges 15,16, while the other thread seam 7 is a straight seam running in parallel with the frame 1.
  • the attachment strip 5 may be formed by four separate part strips, which are stitched together with their edges against one another by means of four thread seams 11.
  • Figure 4 shows a modification of the filter unit in which the filter cloth 3' has been dimensioned with an exterior size that corresponds to the exterior size of the frame 1. In this case the filter cloth 3' abuts against one side of the frame 1.
  • the filter unit 4 according to Fig. 2 is produced in the following manner.
  • the frame 1 is placed on a horizontal foundation and the filter cloth 3, which has been cut out in advance, is applied in the hole 2 of the frame 1.
  • the filter cloth 3 is temporarily connected to the frame 1 by spot gluing the circumferential edge of the filter cloth 3 to the inner edge of the frame 1.
  • the attachment strip 5, the end edges 9,10 of which have been united edge to edge with each other by means of the thread seam 11, is drawn on the frame 1 so that the side portions 12,13 of the attachment strip 5 overlap the rim 14 of the filter cloth 3.
  • the zigzag seam 6 is stitched along the entire circumference of the filter cloth 3 and then the straight seam 7 is likewise stitched along the entire circumference of the filter cloth. This results in that the filter cloth 3 is somewhat stretched.
  • the attachment strip 5 is shrinked by exposing it to heat, whereby the filter cloth 3 is further stretched.
  • the attachment strip 5 needs not be of a shrinkable material if the required stretching of the filter cloth can be achieved by means of the straight seam 7.
  • the filter unit according to Fig. 4 is produced in the same manner as the filter unit 4 according to Fig. 2, except that the filter cloth 3' is placed on one side of the frame 1 and is provisionally connected to the latter by spot gluing the filter cloth 3' to said side of the frame 1.
  • the frame 1 may of course be designed so that it defines a hole having another shape than the one shown, e.g. a polygon with five or more corners.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Filtering Materials (AREA)
  • Biological Treatment Of Waste Water (AREA)

Abstract

Unité de filtre (4) destinée à être utilisée dans un filtre à disque rotatif, comportant un cadre (1) délimitant un trou, et un tissu filtrant (3) s'étendant dans le trou et étant relié au cadre. Selon l'invention, une bande de fixation (5) en matériau souple pouvant être cousu s'étend le long du cadre et entoure ce dernier, et le tissu filtrant est uni à la bande de fixation à l'aide d'au moins une couture par fil (6, 7).
PCT/SE1997/000391 1996-03-22 1997-03-07 Unite de filtre WO1997035656A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9601105-1 1996-03-22
SE9601105A SE506744C2 (sv) 1996-03-22 1996-03-22 Filterenhet för roterande skivfilter och förfarande för dess framställning

Publications (1)

Publication Number Publication Date
WO1997035656A1 true WO1997035656A1 (fr) 1997-10-02

Family

ID=20401901

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1997/000391 WO1997035656A1 (fr) 1996-03-22 1997-03-07 Unite de filtre

Country Status (3)

Country Link
ID (1) ID16381A (fr)
SE (1) SE506744C2 (fr)
WO (1) WO1997035656A1 (fr)

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0882608A1 (fr) * 1997-06-04 1998-12-09 Behr GmbH & Co. Filtre
WO1999030797A1 (fr) * 1997-12-12 1999-06-24 Hydrotech Nils-Åke Persson Aktiebolag Filtre a disque rotatif
WO2000000131A1 (fr) 1998-06-29 2000-01-06 The Procter & Gamble Company Element de transport de liquide possedant des regions de materiau en vrac a permeabilite elevee et des regions d'entree a pression de seuil elevee
WO2000000129A1 (fr) 1998-06-29 2000-01-06 The Procter & Gamble Company Element de transport de liquide pour des vitesses d'ecoulement elevees entre deux regions d'entree
WO2000000701A1 (fr) 1998-06-29 2000-01-06 The Procter & Gamble Company Element de transport de liquides a debit volumique eleve entre une zone d'orifice et une ouverture
WO2000000138A1 (fr) 1998-06-29 2000-01-06 The Procter & Gamble Company Elements de transport de liquides a debits volumiques eleves s'opposant a la force de gravite
WO2000000127A1 (fr) 1998-06-29 2000-01-06 The Procter & Gamble Company Element de transport de liquides a flux eleve comprenant deux regions de permeabilites differentes
US6579457B1 (en) 1999-06-29 2003-06-17 The Procter & Gamble Company Liquid transport member for high flux rates between a port region and an opening
US6673057B1 (en) 1998-06-29 2004-01-06 The Procter & Gamble Company High flux liquid transport members comprising two different permeability regions
US6811842B1 (en) 1999-06-29 2004-11-02 The Procter & Gamble Company Liquid transport member for high flux rates between two port regions
WO2010071555A1 (fr) * 2008-12-19 2010-06-24 Metso Paper, Inc. Procédé et agencement pour fixer un fil sans fin
DE102009029244A1 (de) * 2009-09-07 2011-03-10 Huber Se Filtersegment für den Einsatz in einer Filtrationsvorrichtung sowie Kreissegment zur Aufnahme eines Filtersegments
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
US8801931B2 (en) 2010-02-25 2014-08-12 Evoqua Water Technologies Llc Hybrid aerobic and anaerobic wastewater and sludge treatment systems and methods
US8894855B2 (en) 2008-03-28 2014-11-25 Evoqua Water Technologies Llc Hybrid aerobic and anaerobic wastewater and sludge treatment systems and methods
US9028692B2 (en) 2006-08-14 2015-05-12 Evoqua Water Technologies Llc High flow disc filter
US9359236B2 (en) 2010-08-18 2016-06-07 Evoqua Water Technologies Llc Enhanced biosorption of wastewater organics using dissolved air flotation with solids recycle
US10131550B2 (en) 2013-05-06 2018-11-20 Evoqua Water Technologies Llc Enhanced biosorption of wastewater organics using dissolved air flotation with solids recycle
US10220335B2 (en) 2017-06-02 2019-03-05 Nordic Water Products Ab Filter disc
US10857491B2 (en) 2014-06-05 2020-12-08 Evoqua Water Technologies Llc Filtering panel and method of making the same
US10888807B2 (en) 2016-08-12 2021-01-12 Evoqua Water Technologies Llc Disc filter pre-screen dual media disc filter
EP3766562A4 (fr) * 2018-03-15 2021-12-22 Nordic Water Products AB Filtre à disque de fibre ayant une structure pour empêcher un endommagement de tissu filtrant

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2338549A (en) * 1941-08-01 1944-01-04 Us Rubber Co Filter bag
DE1147918B (de) * 1958-10-03 1963-05-02 Prep Ind Combustibles Befestigung des Filtermediums an den sektorfoermigen Zellen der Scheibenfilter
SE464967B (sv) * 1990-10-23 1991-07-08 Tamfelt Oy Ab Filterpaase foer maskinsikt

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2338549A (en) * 1941-08-01 1944-01-04 Us Rubber Co Filter bag
DE1147918B (de) * 1958-10-03 1963-05-02 Prep Ind Combustibles Befestigung des Filtermediums an den sektorfoermigen Zellen der Scheibenfilter
SE464967B (sv) * 1990-10-23 1991-07-08 Tamfelt Oy Ab Filterpaase foer maskinsikt

Cited By (38)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0882608A1 (fr) * 1997-06-04 1998-12-09 Behr GmbH & Co. Filtre
US6231761B1 (en) 1997-12-12 2001-05-15 Hydrotech Nils-Ake Persson Aktiebolag Rotary disk filter
WO1999030797A1 (fr) * 1997-12-12 1999-06-24 Hydrotech Nils-Åke Persson Aktiebolag Filtre a disque rotatif
WO2000000701A1 (fr) 1998-06-29 2000-01-06 The Procter & Gamble Company Element de transport de liquides a debit volumique eleve entre une zone d'orifice et une ouverture
US6673057B1 (en) 1998-06-29 2004-01-06 The Procter & Gamble Company High flux liquid transport members comprising two different permeability regions
WO2000000138A1 (fr) 1998-06-29 2000-01-06 The Procter & Gamble Company Elements de transport de liquides a debits volumiques eleves s'opposant a la force de gravite
WO2000000136A1 (fr) 1998-06-29 2000-01-06 The Procter & Gamble Company Element de transport de liquides pourvu de zones centrales a permeabilite elevee et de zones d'orifice a pression de seuil elevee
WO2000000127A1 (fr) 1998-06-29 2000-01-06 The Procter & Gamble Company Element de transport de liquides a flux eleve comprenant deux regions de permeabilites differentes
WO2000000129A1 (fr) 1998-06-29 2000-01-06 The Procter & Gamble Company Element de transport de liquide pour des vitesses d'ecoulement elevees entre deux regions d'entree
WO2000000131A1 (fr) 1998-06-29 2000-01-06 The Procter & Gamble Company Element de transport de liquide possedant des regions de materiau en vrac a permeabilite elevee et des regions d'entree a pression de seuil elevee
US6811842B1 (en) 1999-06-29 2004-11-02 The Procter & Gamble Company Liquid transport member for high flux rates between two port regions
US6579457B1 (en) 1999-06-29 2003-06-17 The Procter & Gamble Company Liquid transport member for high flux rates between a port region and an opening
US10207210B2 (en) 2006-08-14 2019-02-19 Evoqua Water Technologies Llc High flow disc filter
US9028692B2 (en) 2006-08-14 2015-05-12 Evoqua Water Technologies Llc High flow disc filter
US8808542B2 (en) 2007-07-18 2014-08-19 Evoqua Water Technologies Llc Disc filter
US9339745B2 (en) 2007-07-18 2016-05-17 Evoqua Water Technologies Llc Trash tolerant filter support for a disc filter
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
US9023208B2 (en) 2007-07-18 2015-05-05 Evoqua Water Technologies Llc Disc filter
US9359238B2 (en) 2008-03-28 2016-06-07 Evoqua Water Technologies Llc Hybrid aerobic and anaerobic wastewater and sludge treatment systems and methods
US8894855B2 (en) 2008-03-28 2014-11-25 Evoqua Water Technologies Llc Hybrid aerobic and anaerobic wastewater and sludge treatment systems and methods
US8894856B2 (en) 2008-03-28 2014-11-25 Evoqua Water Technologies Llc Hybrid aerobic and anaerobic wastewater and sludge treatment systems and methods
US9359239B2 (en) 2008-03-28 2016-06-07 Evoqua Water Technologies Llc Hybrid aerobic and anaerobic wastewater and sludge treatment systems and methods
CN102227245B (zh) * 2008-12-19 2014-03-26 美佐纸业股份有限公司 用于固定环形网的方法和设备
CN102227245A (zh) * 2008-12-19 2011-10-26 美佐纸业股份有限公司 用于固定环形网的方法和设备
WO2010071555A1 (fr) * 2008-12-19 2010-06-24 Metso Paper, Inc. Procédé et agencement pour fixer un fil sans fin
DE102009029244A1 (de) * 2009-09-07 2011-03-10 Huber Se Filtersegment für den Einsatz in einer Filtrationsvorrichtung sowie Kreissegment zur Aufnahme eines Filtersegments
US8801931B2 (en) 2010-02-25 2014-08-12 Evoqua Water Technologies Llc Hybrid aerobic and anaerobic wastewater and sludge treatment systems and methods
US9783440B2 (en) 2010-08-18 2017-10-10 Evoqua Water Technologies Llc Enhanced biosorption of wastewater organics using dissolved air flotation with solids recycle
US9359236B2 (en) 2010-08-18 2016-06-07 Evoqua Water Technologies Llc Enhanced biosorption of wastewater organics using dissolved air flotation with solids recycle
US10131550B2 (en) 2013-05-06 2018-11-20 Evoqua Water Technologies Llc Enhanced biosorption of wastewater organics using dissolved air flotation with solids recycle
US10857491B2 (en) 2014-06-05 2020-12-08 Evoqua Water Technologies Llc Filtering panel and method of making the same
US11660552B2 (en) 2014-06-05 2023-05-30 Evoqua Water Technologies Llc Filtering panel and method of making the same
US10888807B2 (en) 2016-08-12 2021-01-12 Evoqua Water Technologies Llc Disc filter pre-screen dual media disc filter
US12048890B2 (en) 2016-08-12 2024-07-30 Evoqua Water Technologies Llc Disc filter pre-screen dual media disc filter
US10220335B2 (en) 2017-06-02 2019-03-05 Nordic Water Products Ab Filter disc
EP3766562A4 (fr) * 2018-03-15 2021-12-22 Nordic Water Products AB Filtre à disque de fibre ayant une structure pour empêcher un endommagement de tissu filtrant
US11517834B2 (en) 2018-03-15 2022-12-06 Nordic Water Products Ab Fiber disc filter having structure for preventing damage to fabric filter

Also Published As

Publication number Publication date
SE9601105L (sv) 1997-09-23
SE506744C2 (sv) 1998-02-09
SE9601105D0 (sv) 1996-03-22
ID16381A (id) 1997-09-25

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