WO2004000435A1 - Retention d'elements de filtre - Google Patents

Retention d'elements de filtre Download PDF

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Publication number
WO2004000435A1
WO2004000435A1 PCT/GB2003/002706 GB0302706W WO2004000435A1 WO 2004000435 A1 WO2004000435 A1 WO 2004000435A1 GB 0302706 W GB0302706 W GB 0302706W WO 2004000435 A1 WO2004000435 A1 WO 2004000435A1
Authority
WO
WIPO (PCT)
Prior art keywords
bead
filter
channel
cloth
slot
Prior art date
Application number
PCT/GB2003/002706
Other languages
English (en)
Inventor
Bell Robert
Original Assignee
Madison Filter 981 Limited
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 Madison Filter 981 Limited filed Critical Madison Filter 981 Limited
Priority to AU2003240133A priority Critical patent/AU2003240133A1/en
Publication of WO2004000435A1 publication Critical patent/WO2004000435A1/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
    • B01D33/06—Filters with filtering elements which move during the filtering operation with rotary cylindrical filtering surfaces, e.g. hollow drums
    • B01D33/067—Construction of the filtering drums, e.g. mounting or sealing arrangements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D25/00—Filters formed by clamping together several filtering elements or parts of such elements
    • B01D25/12—Filter presses, i.e. of the plate or plate and frame type
    • B01D25/176—Filter presses, i.e. of the plate or plate and frame type attaching the filter element to the filter press plates, e.g. around the central feed hole in the plates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/34—Seals or gaskets for filtering elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/40—Special measures for connecting different parts of the filter

Definitions

  • EP-A-0,888,801 discloses a filter belt edge structure having an edge strip and a track portion or edge bead integrally formed therewith.
  • the edge strip has a slot extending into the strip from the free edge parallel to the plane of the strip, dividing the free edge region of the strip into a pair of superposed flaps, between which the edge region of the filter cloth is received and joined to the flaps by thermal or acoustic welding and/or stitching
  • a frame member for filter panels comprises an extruded body formed with a plurality of grooves with access slots, which are narrower than the diameters of the grooves into which compressible edge beads formed on edge strips are inserted.
  • edge strips are generally similar with a different cross-section of bead to those described in EP-A-0,888,801 but in general they are similar, being cut to provide superposed flaps between which the edge of the filter cloth can be introduced, and secured by adhesive, thermal or ultrasonic welding and/or stitching.
  • the seal between the bead and the slotted channel is not watertight so that particles of the filtrate can enter the tube.
  • the particles which thus lodge themselves in the tube, are difficult to remove by washing, so that after several filtration cycles the removal and replacement of the bead, by pulling out from the slotted tube becomes very difficult.
  • the tube may be damaged (for example by forcing the edges of the slot so far open they cannot be sufficiently closed again) and need to be replaced.
  • An object of the invention is to provide apparatus for retention of filter elements which will effectively prevent access of filtrate particles to the slotted tube, and whereby the filter cloth can be removed and replaced without substantial risk of damage to the slotted tubes.
  • apparatus for retention of filter elements comprises a cavity mounted in or forming part of the frame member for supporting a filter element, and an extruded bead member attached to an edge of a filter cloth, wherein the bead member is profiled to provide a sealing surface which forms a seal with the edges of the slot of the slotted cavity when the filter cloth is subjected to tension.
  • the sealing surface can be provided by a lip provided by the bead profile, and the cavity by a slotted tube.
  • the bead may be extruded onto a cloth strip, so that the bead material forms extensions substantially covering each face of the cloth strip and the main body of the bead is formed on one edge of the strip.
  • the lip may be provided by a flap separated from the extension covering the face of the strip opposing the flap by a channel and extend in the same general direction as the extension from the main body of the bead.
  • the bead preferably has a diameter sufficient to cause it to be retained by the slot of the slotted tube, being significantly larger than the width of the slot, but is also preferably less than the internal diameter of the slotted tube so that when placed under tension the bead can be drawn into the slot to exert sealing pressure on the flap.
  • the filter cloth may be attached by welding, adhesive or stitching to the side of the extension covering the cloth strip opposite to the channel and lip so that the cloth is gripped by one jaw of the slot of the slotted tube.
  • FIG. 1 is a sectional view of a retention arrangement for a filter element according to the invention, not subject to tension;
  • Figure 2 is a sectional view of the same retention arrangement as
  • FIG 1 wherein the filter element is under tension
  • Figure 3 is a sectional view illustrating the back-to-back mounting of slotted tubes forming part of such retention arrangements, on a frame member separating two adjacent panel filters or like devices
  • Figure 4 is a sectional view of a variant embodiment
  • Figure 5 is a sectional view of a frame member is a disc filter between disc segments, e.g. as in WO 00/04975, with retentional arrangements according to the invention.
  • a retention arrangement according to the invention comprises a slotted tube 10, of steel or resilient plastics material, having a slot 1 1 extending along one side thereof.
  • a bead 1 2 of resilient material is received within the slotted tube 1 0, the bead 1 2 having a diameter greater than the width of the slot 1 1 in its relaxed state, and significantly less than the internal diameter of the tube 10.
  • the bead 12 is substantially of circular cross section but is formed with a pair of extensions 1 3, 14 which embrace a reinforcing strip of textile fabric 1 5 one extension being secured by means e.g. of welding, stitching, adhesion or extrusion of the bead onto the edge of the strip 1 5 to each side of the strip 1 5 to substantially completely overlie strip 1 5 on both sides.
  • a filter fabric 1 6 is stitched welded or adhered to the outer side of one of the extensions 1 3, so that the filter fabric 1 6 is securely attached to the bead 1 2.
  • the bead 1 2 further comprises separated from the other said extensions 14 and flexible flap 17 separated from the extensions 1 3, 14 and fabric strips 1 5 by a channel 1 8.
  • this flap 17 is best shown in figure 2 wherein the arrangement is shown as subject to tension acting from the left of the drawing on the filter fabric 1 6, wherein the tension pulls the bead into the slot 1 1 , and forces the flap 1 7 into engagement with the outer face of the extension 14 to thereby provide a seal.
  • FIG 3 shows a back to back arrangement of two slotted tubes 10a, 1 0b welded together at 20 and connected by a bar 21 to which both tubes 1 0a, 10b are also welded.
  • Each slotted tube 10a, 10b will receive a bead structure as shown in figures 1 and 2 so that a frame member is provided to support adjacent filter panels in a drum, disc or segmented filter apparatus.
  • Figure 4 shows a variant embodiment wherein the filter cloth 30 is received between flaps of a web 31 , which is in turn connected to a sealing element 32, of suitable resilient material, and elliptical cross- section.
  • This provides a sealing surface 33 which engages with a shoulder 34 of a channel sectioned member 35 in which the element 32 is received.
  • the element 32 can easily be inserted into the channel member, then rotated through 90° to engage with the shoulder 34, being “jammed” into the position shown in full lines, to resist tension acting on the element 32 via the web 31 .
  • the element 32 has a rigid core, e.g. of metal reinforcement, which can be in the form of a flat bar, oriented in the direction of the major axis of the element 32 and longer than the width of the mouth of the channel member.
  • FIG. 5 shows the use of retention elements in accordance with the invention, as applied to a frame member 40 dividing sector panels 51 , 52 of a rotary disc filter.
  • the frame member 40 itself comprises a plastics or rubber body having a central bore in which a reinforcing metal tubular member 50 is received.
  • the frame member 40 is a moulding or extrusion provided with four narrow-mouthed channels 41 , 42, 43, 44 in which are received edge bead arrangements 45, 46, 47, 48 attached to the edges of four filter cloths 1 6 one of which is provided on each face of the panels 51 , 52 for retention in the channels 41 to 44.
  • the arrangements 45 to 48 are each substantially as described with reference to Figures 1 and 2. It is of course to be understood that the invention is not intended to be restricted to the details of the above embodiments which are described by way of example only.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtration Of Liquid (AREA)

Abstract

L'invention concerne l'assemblage d'un bord d'un tissu filtrant (16) à un élément de bille (12), le bord du tissu présentant des rabats (13, 14) entourant une partie de tissu de renfort (15) fixée sur le tissu filtrant. L'élément de bille (12) comprend également un rabat (17) avec un espace inclus (18) et présente une surface d'étanchéité comprenant un élément de canal de retenue à bord en forme de 'C' (10). La bille (12) est plus large que la fente (11) de l'élément de canal (10) mais plus petite que le diamètre interne de celui-ci. Deux éléments coniques en forme de 'C' peuvent être transportés dos à dos ou par quatre, introduits dans un élément (40), aux fins d'assemblage entre des panneaux filtrants. Dans un autre mode de réalisation, l'élément de bille est elliptique, de manière qu'il puisse être introduit dans un canal selon une orientation déterminée et maintenu après une rotation de 90°. Cet élément de bille peut renfermer un coeur rigide.
PCT/GB2003/002706 2002-06-25 2003-06-23 Retention d'elements de filtre WO2004000435A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003240133A AU2003240133A1 (en) 2002-06-25 2003-06-23 Retention of filter elements

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0214574A GB0214574D0 (en) 2002-06-25 2002-06-25 Improved retention of filter elements
GB0214574.6 2002-06-25

Publications (1)

Publication Number Publication Date
WO2004000435A1 true WO2004000435A1 (fr) 2003-12-31

Family

ID=9939195

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2003/002706 WO2004000435A1 (fr) 2002-06-25 2003-06-23 Retention d'elements de filtre

Country Status (3)

Country Link
AU (1) AU2003240133A1 (fr)
GB (1) GB0214574D0 (fr)
WO (1) WO2004000435A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005053815A1 (fr) * 2003-11-27 2005-06-16 Madison Filter 981 Limited Retenue de tissu filtrant
DE202011005390U1 (de) * 2011-04-20 2014-07-04 Ludwig Mayer Filtertuch

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1306302A (fr) * 1961-11-09 1962-10-13 Prep Ind Combustibles Procédé et dispositif de fixation de toiles filtrantes
GB1123134A (en) * 1966-03-18 1968-08-14 Polysius Gmbh Improvements relating to a filter press
US4921602A (en) * 1986-12-15 1990-05-01 Ingenjorsfirman Per-Oskar Persson Ab Filter for liquids
EP0636397A1 (fr) * 1993-07-28 1995-02-01 JUNKER-FILTER GmbH Elément de filtre pour un filtre de chambre, de membrane ou similaire et procédé de sa production
US5798039A (en) * 1997-02-07 1998-08-25 Wiesemann; Fred E. Drum filter system with removable filter elements and a pawl rotation mechanism
WO2000004975A2 (fr) * 1998-07-22 2000-02-03 Madison Filter 981 Limited Retention d'elements filtrants

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1306302A (fr) * 1961-11-09 1962-10-13 Prep Ind Combustibles Procédé et dispositif de fixation de toiles filtrantes
GB1123134A (en) * 1966-03-18 1968-08-14 Polysius Gmbh Improvements relating to a filter press
US4921602A (en) * 1986-12-15 1990-05-01 Ingenjorsfirman Per-Oskar Persson Ab Filter for liquids
EP0636397A1 (fr) * 1993-07-28 1995-02-01 JUNKER-FILTER GmbH Elément de filtre pour un filtre de chambre, de membrane ou similaire et procédé de sa production
US5798039A (en) * 1997-02-07 1998-08-25 Wiesemann; Fred E. Drum filter system with removable filter elements and a pawl rotation mechanism
WO2000004975A2 (fr) * 1998-07-22 2000-02-03 Madison Filter 981 Limited Retention d'elements filtrants

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005053815A1 (fr) * 2003-11-27 2005-06-16 Madison Filter 981 Limited Retenue de tissu filtrant
AU2004294780B2 (en) * 2003-11-27 2009-04-23 Madison Filter 981 Limited Filter cloth retention
US9248389B2 (en) 2003-11-27 2016-02-02 Madison Filter 981 Ltd. Filter cloth retention
US9616367B2 (en) 2003-11-27 2017-04-11 Madison Filter 981 Ltd. Filter cloth retention
DE202011005390U1 (de) * 2011-04-20 2014-07-04 Ludwig Mayer Filtertuch

Also Published As

Publication number Publication date
AU2003240133A1 (en) 2004-01-06
GB0214574D0 (en) 2002-08-07

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