WO2017068242A1 - Elongated sealing member for a vertical pressure filter, vertical pressure filter and method of using the sealing - Google Patents

Elongated sealing member for a vertical pressure filter, vertical pressure filter and method of using the sealing Download PDF

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Publication number
WO2017068242A1
WO2017068242A1 PCT/FI2016/050727 FI2016050727W WO2017068242A1 WO 2017068242 A1 WO2017068242 A1 WO 2017068242A1 FI 2016050727 W FI2016050727 W FI 2016050727W WO 2017068242 A1 WO2017068242 A1 WO 2017068242A1
Authority
WO
WIPO (PCT)
Prior art keywords
sealing member
elongated sealing
filter
base portion
vertical pressure
Prior art date
Application number
PCT/FI2016/050727
Other languages
French (fr)
Inventor
Mika ILLI
Janne KAIPAINEN
Original Assignee
Outotec (Finland) Oy
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 Outotec (Finland) Oy filed Critical Outotec (Finland) Oy
Publication of WO2017068242A1 publication Critical patent/WO2017068242A1/en

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Classifications

    • 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
    • B01D25/127—Filter presses, i.e. of the plate or plate and frame type with one or more movable filter bands arranged to be clamped between the press plates or between a plate and a frame during filtration, e.g. zigzag endless filter bands
    • B01D25/1275—Filter presses, i.e. of the plate or plate and frame type with one or more movable filter bands arranged to be clamped between the press plates or between a plate and a frame during filtration, e.g. zigzag endless filter bands the plates or the frames being placed in a non-vertical position
    • 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
    • B01D25/28—Leaching or washing filter cakes in the filter handling the filter cake for purposes other than regenerating
    • B01D25/282—Leaching or washing filter cakes in the filter handling the filter cake for purposes other than regenerating for drying
    • B01D25/285—Leaching or washing filter cakes in the filter handling the filter cake for purposes other than regenerating for drying by compression using inflatable membranes
    • 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
    • B01D25/127—Filter presses, i.e. of the plate or plate and frame type with one or more movable filter bands arranged to be clamped between the press plates or between a plate and a frame during filtration, e.g. zigzag endless filter bands
    • 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
    • B01D25/21—Plate and frame presses
    • 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
    • B01D25/21—Plate and frame presses
    • B01D25/215—Construction of the filter plates, frames
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/09—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with filtering bands, e.g. movable between filtering operations
    • B01D29/096—Construction of filtering bands or supporting belts, e.g. devices for centering, mounting or sealing the filtering bands or the supporting belts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/02—Sealings between relatively-stationary surfaces
    • 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

Definitions

  • the invention relates to a method for sealing a vertical pressure filter as defined in the preamble of independent claim 1.
  • the invention also relates to a vertical pressure filter as defined in the preamble of independent claim 7.
  • the invention also relates to an elongated sealing member for use in the method and in the vertical pressure filter.
  • the object of the invention is to provide a method for reliable sealing in a vertical pressure filter, a vertical pressure filter having a reliable sealing and an elongated sealing member for use in the method and in the vertical pressure filter.
  • the method for sealing a vertical pressure filter is characterized by the definitions of independent claim 1.
  • the vertical pressure filter is correspondingly characterized by the definitions of independent claim 7.
  • the elongated sealing member for use in the method and in the vertical pressure filter is presented in claim 18.
  • Preferred embodiments of the elongated sealing member are defined in the dependent claims 19 to 40.
  • Figure 1 shows is side view a vertical pressure filter according to an embodiment in a closed state of a filter pack of the vertical pressure filter
  • Figure 2 shows the vertical pressure filter shown in figure 1 in an open state of the filter pack of the vertical pressure filter
  • Figure 3 shows in cross section a detail of the vertical pressure filter shown in figure 1 in a closed state of the filter pack of the vertical pressure filter
  • Figure 4 shows in cross section a detail of the vertical pressure filter shown in figure 1 in a closed state of the filter pack of the vertical pressure filter
  • Figure 5 shows in shows in cross section a detail of a movable filter plate of the vertical pressure filter shown in figure 1,
  • Figure 6 shows a section of the elongated sealing member of the vertical pressure filter shown in figure 1
  • Figures 7 and 8 shows in shows in cross section the elongated sealing member shown in figure 6,
  • Figure 9 shows a section of a first alternative embodiment of the elongated sealing member
  • Figure 10 shows in shows in cross section the elongated sealing member shown in figure
  • Figure 11 shows a section of a second alternative embodiment of the elongated sealing member
  • Figure 12 shows in shows in cross section the elongated sealing member shown in figure
  • Figure 13 shows a section of a third alternative embodiment of the elongated sealing member
  • Figures 14 and 15 shows in shows in cross section the elongated sealing member shown in figure 13.
  • the invention relates to a method for sealing a vertical pressure filter 1, to vertical pressure filter 1 and to a elongated sealing member for use in the method and in the vertical pressure filter 1.
  • the method is a method for sealing a vertical pressure filter 1 comprising a filter pack 2 comprising a plurality of separate horizontally arranged and vertically movable filter plates 3.
  • Each filter plate 3 has a lower surface 4 and an upper surface 5.
  • the vertical pressure filter 1 comprises an endless movable filter fabric belt 6 is arranged in zigzag manner between the filter plates 3.
  • the vertical pressure filter 1 comprises closing and opening means 7 for vertically moving said plurality of separate horizontally arranged and vertically movable filter plates 3 against each other into a closed state of the filter pack 2 to form filter chambers 8 between the filter plates 3 and upward facing surface sections 9 of the endless movable filter fabric belt 6 and for vertically moving said plurality of separate horizontally arranged and vertically movable filter plates 3 away from each other into an open state of the filter pack 2 to open said filter chambers 8.
  • the method comprises arranging a seal 10 in a circumferential groove 11 in the lower surface of at least one separate horizontally arranged and vertically movable filter plate.
  • the method comprises pressing the seal 10 against an upward facing surface section 9 of the endless movable filter fabric belt 6 in the closed state of the filter pack 2 by means of the closing and opening means 7.
  • the method comprises forming the seal 10 of at least one elongated sealing member 19.
  • the method comprises fastening said at least one elongated sealing member 19 in the circumferential groove 11 by means of adhesive 12 that is provided in the circumferential groove 11 between said at least one separate horizontally arranged and vertically movable filter plate 3 and said at least one elongated sealing member 19.
  • Another advantage is that a seal 10 of simple and less expensive construction can be used.
  • the adhesive 12 provides for additional sealing by preventing fluid from passing between said at least one elongated sealing member 19 and the surface of the vertical pressure filter 1 to which said at least one elongated sealing member 19 is fastened.
  • said at least one separate horizontally arranged and vertically movable filter plate 3 can, as in the figures, comprise a bottom plate 13, a frame 14 below the bottom plate, and an elastic and waterproof diaphragm 15 attached between the bottom plate 13 and the frame 14, wherein the filter chamber 8 being in the closed state limited by the elastic and waterproof diaphragm 15, the endless movable filter fabric belt 6 and the frame 14 so that the filter chamber 8 has a volume, and wherein the vertical pressure filter 1 comprises inflating means (not shown in the drawings) for inflating fluid such as liquid or gas between the elastic and waterproof diaphragm 15 and the bottom plate to reduce the volume of the filter chamber 8 in the closed state.
  • inflating means not shown in the drawings
  • said at least one separate horizontally arranged and vertically movable filter plate 3 can, as in the figures, comprise a bottom plate 13, a frame 14 below the bottom plate 13, and an elastic and waterproof diaphragm 15 attached between the bottom plate 13 and the frame 14, as described above, the filter chamber 8 can be horizontally limited by the frame 14, as shown in the figures.
  • said at least one separate horizontally arranged and vertically movable filter plate 3 can, as in the figures, comprise a bottom plate 13, a frame 14 below the bottom plate 13, and an elastic and waterproof diaphragm 15 attached between the bottom plate 13 and the frame 14, as described above, the lower surface 4 of at least one separate horizontally arranged and vertically movable filter plate 3 can be formed at the frame 14, as shown in the figures.
  • said at least one separate horizontally arranged and vertically movable filter plate 3 can, as in the figures, comprise a bottom plate 13, a frame 14 below the bottom plate 13, and an elastic and waterproof diaphragm 15 attached between the bottom plate 13 and the frame 14, as described above, the frame 14 can comprise channels (not marked with a reference numeral) for feeding material to be filtered such as slurry and fluids such as water and air into the filter chamber 8 in the closed state, as shown in the figures.
  • said at least one separate horizontally arranged and vertically movable filter plate 3 can, as in the figures, comprise a bottom plate 13, a frame 14 below the bottom plate 13, and an elastic and waterproof diaphragm 15 attached between the bottom plate 13 and the frame 14, as described above, the bottom plate 13 can comprise a drainage screen 16 for supporting the endless movable filter fabric belt 6 and a drainage channel 18 in fluid connection with the drainage screen 16 for leading filtrate from the drainage screen 16 to the outside of the bottom plate 13, as shown in the figures.
  • the method can comprise providing retainers 17 for keeping the said at least one elongated sealing member 19 in the circumferential groove 11.
  • the purpose of such retainers 17 is to assure that said at least one elongated sealing member 19is in correct position and/or to provide for additional retaining action for keeping said at least one elongated sealing member 19in the circumferential groove 11.
  • the method can comprise forming the seal 10 of a single elongated sealing member 19.
  • An advantage with forming the seal 10 of a single elongated sealing member 19 is that less joints, possible only one joint, is formed in the seal 10, where the seal 10 can fail.
  • To fasten a seal 10 in the form of a single elongated sealing member 19 by means of adhesive 12 is also quick and easy.
  • Said at least one elongated sealing member 19, that is used in the method comprises preferably, but not necessarily, adhesive 12, so that the elongated sealing member comprises a base portion 20, a ridge portion 21, and an intermediate portion 22 between the base portion 20 and the ridge portion 21, wherein the base portion 20 comprising a plane side 29, wherein the base portion 20 having opposite fastening portions 23 extending in traverse directions in relation to a longitudinal direction of said at least one elongated sealing member 19, and wherein the adhesive 12 being provided between the plane side 29 of said at least one elongated sealing member 19 and the filter plate.
  • At least one elongated sealing member 19 having such configuration is that the ridge portion 21 can adapt to the form of the upward facing surface section 9 of the endless movable filter fabric belt 6 and prevents effectively gaps to be formed between said at least one elongated sealing member 19and the upward facing surface section 9 of the endless movable filter fabric belt 6.
  • Another advantage is that the intermediate portion 22 forms a large portion of said at least one elongated sealing member 19that presses against the upward facing surface section 9 of the endless movable filter fabric belt 6 in the closed state of the filter pack 2.
  • Said at least one elongated sealing member 19 that is used in the method is preferably, but not necessarily, symmetrical with respect to a center plane X that is vertical to the plane side 29.
  • the circumferential groove 11 in the lower surface 4 of at least one separate horizontally arranged and vertically movable filter plate 3 has preferably, but not necessarily, third opposite side planes 32 and a plane surface 33 between the third opposite side planes 32.
  • the vertical pressure filter 1 comprises a filter pack 2 comprises a plurality of separate horizontally arranged and vertically movable filter plates 3, each having a lower surface 4 and an upper surface 5.
  • the vertical pressure filter 1 comprises an endless movable filter fabric belt 6 arranged in zigzag manner between the filter plates 3.
  • the vertical pressure filter 1 comprises closing and opening means 7 for vertically pressing said plurality of separate horizontally arranged and vertically movable filter plates 3 against each other into a closed state of the filter pack 2 to form filter chambers 8 between filter plates 3 and an upward facing surface sections 9 of the endless movable filter fabric belt 6 and for vertically moving said plurality of separate horizontally arranged and vertically movable filter plates 3 away from each other into an open state of the filter pack 2 to open said filter chambers 8.
  • the vertical pressure filter 1 comprises a seal 10 arranged in a circumferential groove 11 in the lower surface 4 of at least one separate horizontally arranged and vertically movable filter plate, wherein the seal 10 is configured to press against the upward facing surface section 9 of the endless movable filter fabric belt 6 in the closed state of the filter pack 2.
  • the seal 10 is formed of at least one elongated sealing member 19 that is fastened in the circumferential groove 11 by means of an adhesive 12 that is provided in the circumferential groove 11 between said at least one separate horizontally arranged and vertically movable filter plate 3 and said at least one elongated sealing member 19.
  • Another advantage is that a seal 10 of simple and less expensive construction can be used.
  • the adhesive 12 provides for additional sealing by preventing fluid from passing between said at least one elongated sealing member 19 and the surface of the vertical pressure filter 1 to which said at least one elongated sealing member 19 is fastened.
  • Said at least one separate horizontally arranged and vertically movable filter plate 3 may, as shown in the figures, comprise a bottom plate 13, a frame 14 below the bottom plate 13, and an elastic and waterproof diaphragm 15 attached between the bottom plate 13 and the frame 14.
  • the filter chamber 8 is in the closed state limited by the elastic and waterproof diaphragm 15, the endless movable filter fabric belt 6 and the frame 14 so that the filter chamber 8 has a volume.
  • the vertical pressure filter 1 comprises inflating means for inflating fluid such as liquid or gas between the elastic and waterproof diaphragm 15 and the bottom plate 13 to reduce the volume of the filter chamber 8 in the closed state.
  • said at least one separate horizontally arranged and vertically movable filter plate 3 comprise a bottom plate 13, a frame 14 below the bottom plate 13, and an elastic and waterproof diaphragm 15 attached between the bottom plate 13 and the frame 14, the filter chamber 8 may, as shown in the figures, be horizontally limited by the frame 14
  • said at least one separate horizontally arranged and vertically movable filter plate 3 comprise a bottom plate 13, a frame 14 below the bottom plate 13, and an elastic and waterproof diaphragm 15 attached between the bottom plate 13 and the frame 14, the lower surface 4 of at least one separate horizontally arranged and vertically movable filter plate 3 may, as shown in the figures, be formed at the frame 14.
  • said at least one separate horizontally arranged and vertically movable filter plate 3 comprise a bottom plate 13, a frame 14 below the bottom plate 13, and an elastic and waterproof diaphragm 15 attached between the bottom plate 13 and the frame 14,
  • the frame 14 may, as shown in the figures, comprise channels for feeding material to be filtered such as slurry and fluids such as water and air into the filter chamber 8 in the closed state.
  • said bottom plate 13 may comprise a drainage screen 16 for supporting the endless movable filter fabric belt 6 and a drainage channel 18 in fluid connection with the drainage screen 16 for leading filtrate from the drainage screen 16 to the outside of the bottom plate 13, as shown in the figures.
  • the vertical pressure filter 1 comprises preferably, but not necessarily, retainers 17 for keeping said at least one elongated sealing member 19in the circumferential groove 11.
  • the purpose of such retainers 17 is to assure that said at least one elongated sealing member 19is in correct position and/or to provide for additional retaining action for keeping said at least one elongated sealing member 19 in the circumferential groove 11.
  • the seal 10 is preferably, but not necessarily, formed of a single elongated sealing member 19.
  • An advantage with forming the seal 10 of a single elongated sealing member 19 is that less joints, possible only one joint, is formed in the seal 10, where the seal 10 can fail.
  • To fasten a seal 10 in the form of a single elongated sealing member 19 by means of adhesive 12 is also quick and easy.
  • Said at least on elongated sealing member 19 comprises preferably, but not necessarily, adhesive 12, wherein said at least one elongated sealing member 19 comprising a base portion 20, a ridge portion 21, and an intermediate portion 22 between the base portion 20 and the ridge portion 21, wherein the base portion 20 comprising a plane side 29, wherein the base portion 20 having opposite fastening portions 23 extending in traverse directions in relation to a longitudinal direction of said at least one elongated sealing member 19, and wherein the adhesive 12 being provided between the plane side 29 of said at least one elongated sealing member 19 and the filter plate.
  • At least one elongated sealing member 19 having such configuration is that the ridge portion 21 can adapt to the form of the upward facing surface section 9 of the endless movable filter fabric belt 6 and prevents effectively gaps to be formed between said at least one elongated sealing member 19 and the upward facing surface section 9 of the endless movable filter fabric belt 6.
  • Another advantage is that the intermediate portion 22 forms a large portion of said at least one elongated sealing member 19that presses against the upward facing surface section 9 of the endless movable filter fabric belt 6 in the closed state of the filter pack 2.
  • Said at least one elongated sealing member 19 is preferably, but not necessarily, symmetrical with respect to a center plane X that is vertical to the plane side 29 of said at least one elongated sealing member 19.
  • the circumferential groove 11 in the lower surface 4 of at least one separate horizontally arranged and vertically movable filter plate 3 has preferably, but not necessarily, third opposite side planes 32 and a plane surface 33 between the third opposite side planes 32.
  • the elongated sealing member 19 comprises adhesive 12.
  • the elongated sealing member 19 comprises a base portion 20, a ridge portion 21, and an intermediate portion 22 between the base portion 20 and the ridge portion 21.
  • the base portion 20 comprises a plane side 29
  • the base portion 20 has opposite fastening portions 23 extending in traverse directions in relation to a longitudinal direction of the elongated sealing member 19.
  • the adhesive 12 is provided at the plane side 29 of the base portion 20.
  • an advantage with an elongated sealing member 19 having such configuration is that the ridge portion 21 can adapt to the form of the upward facing surface section 9 of the endless movable filter fabric belt 6 and prevents effectively gaps to be formed between the elongated sealing member 19and the upward facing surface section 9 of the endless movable filter fabric belt 6.
  • Another advantage is that the intermediate portion 22 forms a large portion of the elongated sealing member 19that presses against the upward facing surface section 9 of the endless movable filter fabric belt 6 in the closed state of the filter pack 2.
  • An advantage is that adhesive 12 provides for additional sealing preventing fluid from passing between the elongated sealing member 19 and the surface of the vertical pressure filter 1 to which the elongated sealing member 19 is fastened.
  • the adhesive 12 on the elongated sealing member 19 facilitates fastening of the elongated sealing member 19.
  • the elongated sealing member 19 is preferably, but not necessarily, completely formed of elastically deformable material.
  • An advantage of this is that the elongated sealing member 19 can easily adapt to the form of the upward facing surface section 9 of the endless movable filter fabric belt 6, because the elongated sealing member 19 contains no elastically undeformable parts such as parts of metal.
  • the outer surface of the elongated sealing member 19 is preferably, but not necessarily, completely formed of elastically deformable material.
  • the base portion 20 has preferably, but not necessarily, a rectangular cross section.
  • a rectangular cross section facilitates mounting of the elongated sealing member 19.
  • Another advantage of this is that a rectangular cross section creates an even pressure on the plane side 29 of the base portion 20, which means that the adhesive 12 is evenly pressed already when the filter plates 3 for the first time are brought into the closed state.
  • the base portion 20 has preferably, but not necessarily, first opposite side planes 30, which are essentially perpendicular with respect to the plane side 29 of the base portion 20.
  • first opposite side planes 30, which are essentially perpendicular with respect to the plane side 29 of the base portion 20.
  • the height A of the base portion 20 as measured in a direction perpendicular to the plane side 29 of the base portion 20 can be between 1 and 5 mm, preferable between 1 and 3 mm, such as about 2 mm.
  • the width B of the base portion 20 as measured in a direction along to the plane side 29 of the base portion 20 can be between 40 and 50 mm, preferable between 42 and 46 mm, such as about 44 mm.
  • An advantage of this is that the width B of the base portion 20 is so wide that the elongated sealing member 19 can centralize itself in a circumferential groove 11 in a lower surface 4 of a horizontally arranged and vertically movable filter plate 3 by pressing against possible third opposite side planes 32 in the circumferential groove 11 in the lower surface 4 of the horizontally arranged and vertically movable filter plate 3.
  • the width B of the base portion 20 is so wide that opposite fastening portions 23 of the base portion 20 can more easily reach under possible retainers 17 provided for keeping the elongated sealing member 19 in the circumferential groove 11 in the lower surface 4 of the horizontally arranged and vertically movable filter plate 3.
  • the width B of the base portion 20 is so wide that a large plane side 29 is created for adhesive 12, which presses against a possible plane surface 33 forming a bottom of the circumferential groove 11 in the lower surface 4 of the horizontally arranged and vertically movable filter plate 3, which in turn increases the sealing effect between the elongated sealing member 19 and the horizontally arranged and vertically movable filter plate 3.
  • width B of the base portion 20 is so wide that a large plane side 29 is created for adhesive 12, so that the adhesive better can retain the elongated sealing member 19 in the circumferential groove 11 in the lower surface 4 of the horizontally arranged and vertically movable filter plate 3.
  • Adhesive 12 is preferably, but not necessarily, provided on 30 to 100 , such as on 75 to 95 , of the plane side 29 of the base portion 20 of the elongated sealing member 19.
  • the intermediate portion 22 can have a partly undulating profile between the ridge portion 21 and the base portion 20.
  • the intermediate portion 22 can have a rounded edge at the base portion 20.
  • the radius of the rounded edge can be between 1 and 3 mm, preferably about 2 mm.
  • the intermediate portion 22 may have opposite second opposite side planes 31, which extend essentially perpendicularly to the plane side 29 of the base portion 20.
  • the height C of the intermediate portion 22 as measured in a direction perpendicular to the plane side 29 of the base portion 20 may be between 7 and 13 mm, preferably between 8 and 10 mm, such as about 9 mm.
  • the width D of the intermediate portion 22 as measured in a direction parallel with the plane side 29 of the base portion 20 may be between 30 and 40 mm, preferably between 32 and 38 mm, such as 36 mm.
  • the intermediate portion 22 may, as shown in figures 6 to 12, comprise a first intermediate section 24 between the base portion 20 and the rounded ridge portion 21, and a second intermediate section 25 between the first intermediate section 24 and the base portion 20.
  • the height E of the first intermediate section 24 may be between 2 and 5 mm, preferably between 2 and 4 mm, such as about 3 mm
  • the height F of the second intermediate section 25 may be between 5 and 8 mm, preferably between 5 and 7 mm, such as about 6 mm.
  • the ridge portion 21 may be a rounded ridge portion 21.
  • An advantage of this is a durable and wear-resistant ridge portion 21.
  • the height G of the ridge portion 21 as measured in a direction perpendicular to the plane side 29 of the elongated sealing member 19 may be between 1 and 4 mm, preferable between 1 and 3 mm, such as about 2 mm.
  • the width H of the ridge portion 21 as measured in a direction in parallel with the plane side 29 of the elongated sealing member 19 may be between 1 and 4 mm, preferable between 1 and 3 mm, such as about 2 mm.
  • the adhesive 12 may be being protected by a removable strip.
  • An advantage of this is easy attachment of the elongated sealing member 19.
  • the elongated sealing member 19 is preferably, but not necessarily, of one-piece construction.
  • An advantage with forming the seal 10 of a single elongated sealing member 19 is that less joints, possible only one joint, is formed in the seal 10, where the seal 10 can fail.
  • To fasten seal in the form of a single elongated sealing member 19 by means of adhesive 12 is also quick and easy.
  • the elongated sealing member 19 comprises preferably, but no necessarily, a material having Shore A hardness between 40 and 100, preferably between 50 and 90.
  • the opposite fastening portions 23 of the base portion 20 may be at least partly formed of elongated metal profiles 26, as in the first alternative embodiment shown in figures 9 and 10.
  • the elongated sealing member 19 may, as in the second alternative embodiment shown in figures 11 and 12, comprise a first material 27 having Shore A hardness between 50 and 150, preferably between 90 and 150, and a second material 28 having Shore A hardness between 40 and 100, preferably between 50 and 90, so that by at least the opposite fastening portions 23 of the base portion 20 being made of the first material 27.
  • a first material 27 having such hardness provides for sufficient flexible deformability to facilitate mounting of the elongated sealing member 19 but for sufficient rigidity to maintain the form of the base portion 20 elongated sealing member 19 and that a second material 28 having such flexible deformability to provide for sufficient sealing action.
  • the elongated sealing member 19 may comprise a first material 27 having Shore A hardness between 50 and 150, preferably between 90 and 150, and a second material 28 having Shore A hardness between 40 and 100, preferably between 50 and 90, so that by at least the ridge portion 21 being made of the second material 28.
  • the elongated sealing member 19 is preferably, but not necessarily, made by first extruding one of the first material 27 and the second material 28 and thereafter by extruding the other of the first material 27 and the second material 28 onto said one of the first material 27 and the second material 28.
  • the first material 27 is preferably, but not necessarily, in direct contact with the second material 28 i.e. without any intermediate material such as adhesive between the first material 27 and the second material 28.
  • the elongated sealing member 19 comprising any of the following: Natural rubber (NR),
  • Styrene butadiene rubber SBR
  • Butyl rubber IIR
  • Nitrile rubber NBR
  • Epichlorohydrin rubber ECO, CO
  • Chloroprene rubber CR
  • Urethane rubber U
  • Fluoro rubber FPM
  • Silicone rubber Q
  • Chlorsulphonated polyethylene rubber CSM
  • Ethylene propylene rubber EPDM
  • Styrenic block copolymers TPE-s
  • TPE-o Polyolefin blends
  • TPE-v or TPV Thermoplastic polyurethanes
  • TPU Thermoplastic copolyester
  • Thermoplastic polyamides Thermoplastic polyamides.
  • the adhesive 12 is preferably, but not necessarily, elastically deformable after curing to withstand alternating opening state and closing state of the filter pack 2.
  • the adhesive 12 is preferably, but not necessarily, selected so that it can attach to elastomers and metals.
  • the adhesive 12 is preferably, but not necessarily, selected so that it retains its adhesive function at a temperature range between -10 and 90°C.
  • the adhesive 12 comprises preferably, but not necessarily, any of the following: an heat- activated adhesive, an heat- activated tape, an acrylic foam adhesive, and an acrylic foam tape.
  • the adhesive 12 is bonded to the elongated sealing member 19 by heat- activation.
  • the heat- activated adhesive guarantees a durable none especially, but not excluding others, to elongated sealing members 19 made of EPDM and TPE rubber.
  • the adhesive 12 is an acrylic foam tape. Based on the visco-elastic consistence of acrylic foam tapes, a high cohesiveness combined with a brilliant shock- and weathering resistance is achieved.
  • the elongated sealing member 19 is preferably, but not necessarily, symmetrical with respect to a center plane X that is vertical to the plane side 29,

Abstract

The invention relates to a method for sealing a vertical pressure filter, to a vertical pressure filter and to an elongated sealing member for use in the method and in the vertical pressure filter. The vertical pressure filter (1) comprises a filter pack (2) comprising filter plates (3), each having a lower surface (4) and an upper surface (5), an endless movable filter fabric belt (6) arranged in zigzag manner between the filter plates (3), and a seal (10) arranged in a circumferential groove (11) in the lower surface (4) of filter plate. The seal (10) is configured to press against an upward facing surface section (9) of the endless movable filter fabric belt (6) in a closed state of the filter pack (2). The seal (10) is formed of at least one elongated sealing member (19) that is fastened in the circumferential groove (11) by means of an adhesive (12).

Description

ELONGATED SEALING MEMBER FOR A VERTICAL PRESSURE FILTER,
VERTICAL PRESSURE FILTER AND METHOD OF USING THE SEALING
Field of the invention
The invention relates to a method for sealing a vertical pressure filter as defined in the preamble of independent claim 1.
The invention also relates to a vertical pressure filter as defined in the preamble of independent claim 7.
The invention also relates to an elongated sealing member for use in the method and in the vertical pressure filter.
Objective of the invention
The object of the invention is to provide a method for reliable sealing in a vertical pressure filter, a vertical pressure filter having a reliable sealing and an elongated sealing member for use in the method and in the vertical pressure filter.
Short description of the invention
The method for sealing a vertical pressure filter is characterized by the definitions of independent claim 1.
Preferred embodiments of the method are defined in the dependent claims 2 to 6.
The vertical pressure filter is correspondingly characterized by the definitions of independent claim 7.
Preferred embodiments of the vertical pressure filter are defined in the dependent claims
8 to 17.
The elongated sealing member for use in the method and in the vertical pressure filter is presented in claim 18.
Preferred embodiments of the elongated sealing member are defined in the dependent claims 19 to 40.
List of figures
In the following the invention will described in more detail by referring to the figures, of which
Figure 1 shows is side view a vertical pressure filter according to an embodiment in a closed state of a filter pack of the vertical pressure filter,
Figure 2 shows the vertical pressure filter shown in figure 1 in an open state of the filter pack of the vertical pressure filter,
Figure 3 shows in cross section a detail of the vertical pressure filter shown in figure 1 in a closed state of the filter pack of the vertical pressure filter,
Figure 4 shows in cross section a detail of the vertical pressure filter shown in figure 1 in a closed state of the filter pack of the vertical pressure filter,
Figure 5 shows in shows in cross section a detail of a movable filter plate of the vertical pressure filter shown in figure 1,
Figure 6 shows a section of the elongated sealing member of the vertical pressure filter shown in figure 1,
Figures 7 and 8 shows in shows in cross section the elongated sealing member shown in figure 6,
Figure 9 shows a section of a first alternative embodiment of the elongated sealing member,
Figure 10 shows in shows in cross section the elongated sealing member shown in figure
9,
Figure 11 shows a section of a second alternative embodiment of the elongated sealing member,
Figure 12 shows in shows in cross section the elongated sealing member shown in figure
11,
Figure 13 shows a section of a third alternative embodiment of the elongated sealing member, and
Figures 14 and 15 shows in shows in cross section the elongated sealing member shown in figure 13.
Detailed description of the invention
The invention relates to a method for sealing a vertical pressure filter 1, to vertical pressure filter 1 and to a elongated sealing member for use in the method and in the vertical pressure filter 1.
First the method for sealing a vertical pressure filter 1 and some embodiments and variants of the method will be described in greater detail.
The method is a method for sealing a vertical pressure filter 1 comprising a filter pack 2 comprising a plurality of separate horizontally arranged and vertically movable filter plates 3. Each filter plate 3 has a lower surface 4 and an upper surface 5. The vertical pressure filter 1 comprises an endless movable filter fabric belt 6 is arranged in zigzag manner between the filter plates 3. The vertical pressure filter 1 comprises closing and opening means 7 for vertically moving said plurality of separate horizontally arranged and vertically movable filter plates 3 against each other into a closed state of the filter pack 2 to form filter chambers 8 between the filter plates 3 and upward facing surface sections 9 of the endless movable filter fabric belt 6 and for vertically moving said plurality of separate horizontally arranged and vertically movable filter plates 3 away from each other into an open state of the filter pack 2 to open said filter chambers 8.
The method comprises arranging a seal 10 in a circumferential groove 11 in the lower surface of at least one separate horizontally arranged and vertically movable filter plate.
The method comprises pressing the seal 10 against an upward facing surface section 9 of the endless movable filter fabric belt 6 in the closed state of the filter pack 2 by means of the closing and opening means 7.
The method comprises forming the seal 10 of at least one elongated sealing member 19.
The method comprises fastening said at least one elongated sealing member 19 in the circumferential groove 11 by means of adhesive 12 that is provided in the circumferential groove 11 between said at least one separate horizontally arranged and vertically movable filter plate 3 and said at least one elongated sealing member 19.
An advantage is that adhesive 12 provides for additional sealing.
Another advantage is that a seal 10 of simple and less expensive construction can be used.
Another advantage is that the adhesive 12 provides for additional sealing by preventing fluid from passing between said at least one elongated sealing member 19 and the surface of the vertical pressure filter 1 to which said at least one elongated sealing member 19 is fastened.
In the method said at least one separate horizontally arranged and vertically movable filter plate 3 can, as in the figures, comprise a bottom plate 13, a frame 14 below the bottom plate, and an elastic and waterproof diaphragm 15 attached between the bottom plate 13 and the frame 14, wherein the filter chamber 8 being in the closed state limited by the elastic and waterproof diaphragm 15, the endless movable filter fabric belt 6 and the frame 14 so that the filter chamber 8 has a volume, and wherein the vertical pressure filter 1 comprises inflating means (not shown in the drawings) for inflating fluid such as liquid or gas between the elastic and waterproof diaphragm 15 and the bottom plate to reduce the volume of the filter chamber 8 in the closed state.
If in the method said at least one separate horizontally arranged and vertically movable filter plate 3 can, as in the figures, comprise a bottom plate 13, a frame 14 below the bottom plate 13, and an elastic and waterproof diaphragm 15 attached between the bottom plate 13 and the frame 14, as described above, the filter chamber 8 can be horizontally limited by the frame 14, as shown in the figures.
If in the method said at least one separate horizontally arranged and vertically movable filter plate 3 can, as in the figures, comprise a bottom plate 13, a frame 14 below the bottom plate 13, and an elastic and waterproof diaphragm 15 attached between the bottom plate 13 and the frame 14, as described above, the lower surface 4 of at least one separate horizontally arranged and vertically movable filter plate 3 can be formed at the frame 14, as shown in the figures.
If in the method said at least one separate horizontally arranged and vertically movable filter plate 3 can, as in the figures, comprise a bottom plate 13, a frame 14 below the bottom plate 13, and an elastic and waterproof diaphragm 15 attached between the bottom plate 13 and the frame 14, as described above, the frame 14 can comprise channels (not marked with a reference numeral) for feeding material to be filtered such as slurry and fluids such as water and air into the filter chamber 8 in the closed state, as shown in the figures.
If in the method said at least one separate horizontally arranged and vertically movable filter plate 3 can, as in the figures, comprise a bottom plate 13, a frame 14 below the bottom plate 13, and an elastic and waterproof diaphragm 15 attached between the bottom plate 13 and the frame 14, as described above, the bottom plate 13 can comprise a drainage screen 16 for supporting the endless movable filter fabric belt 6 and a drainage channel 18 in fluid connection with the drainage screen 16 for leading filtrate from the drainage screen 16 to the outside of the bottom plate 13, as shown in the figures.
The method can comprise providing retainers 17 for keeping the said at least one elongated sealing member 19 in the circumferential groove 11. The purpose of such retainers 17 is to assure that said at least one elongated sealing member 19is in correct position and/or to provide for additional retaining action for keeping said at least one elongated sealing member 19in the circumferential groove 11.
The method can comprise forming the seal 10 of a single elongated sealing member 19. An advantage with forming the seal 10 of a single elongated sealing member 19 is that less joints, possible only one joint, is formed in the seal 10, where the seal 10 can fail. To fasten a seal 10 in the form of a single elongated sealing member 19 by means of adhesive 12 is also quick and easy.
Said at least one elongated sealing member 19, that is used in the method, comprises preferably, but not necessarily, adhesive 12, so that the elongated sealing member comprises a base portion 20, a ridge portion 21, and an intermediate portion 22 between the base portion 20 and the ridge portion 21, wherein the base portion 20 comprising a plane side 29, wherein the base portion 20 having opposite fastening portions 23 extending in traverse directions in relation to a longitudinal direction of said at least one elongated sealing member 19, and wherein the adhesive 12 being provided between the plane side 29 of said at least one elongated sealing member 19 and the filter plate. An advantage with using in the method at least one elongated sealing member 19 having such configuration is that the ridge portion 21 can adapt to the form of the upward facing surface section 9 of the endless movable filter fabric belt 6 and prevents effectively gaps to be formed between said at least one elongated sealing member 19and the upward facing surface section 9 of the endless movable filter fabric belt 6. Another advantage is that the intermediate portion 22 forms a large portion of said at least one elongated sealing member 19that presses against the upward facing surface section 9 of the endless movable filter fabric belt 6 in the closed state of the filter pack 2. Said at least one elongated sealing member 19 that is used in the method, is preferably, but not necessarily, symmetrical with respect to a center plane X that is vertical to the plane side 29.
The circumferential groove 11 in the lower surface 4 of at least one separate horizontally arranged and vertically movable filter plate 3 has preferably, but not necessarily, third opposite side planes 32 and a plane surface 33 between the third opposite side planes 32.
Next the vertical pressure filter 1 and some embodiments and variants of the vertical pressure filter 1 will be described in greater detail.
The vertical pressure filter 1 comprises a filter pack 2 comprises a plurality of separate horizontally arranged and vertically movable filter plates 3, each having a lower surface 4 and an upper surface 5.
The vertical pressure filter 1 comprises an endless movable filter fabric belt 6 arranged in zigzag manner between the filter plates 3.
The vertical pressure filter 1 comprises closing and opening means 7 for vertically pressing said plurality of separate horizontally arranged and vertically movable filter plates 3 against each other into a closed state of the filter pack 2 to form filter chambers 8 between filter plates 3 and an upward facing surface sections 9 of the endless movable filter fabric belt 6 and for vertically moving said plurality of separate horizontally arranged and vertically movable filter plates 3 away from each other into an open state of the filter pack 2 to open said filter chambers 8.
The vertical pressure filter 1 comprises a seal 10 arranged in a circumferential groove 11 in the lower surface 4 of at least one separate horizontally arranged and vertically movable filter plate, wherein the seal 10 is configured to press against the upward facing surface section 9 of the endless movable filter fabric belt 6 in the closed state of the filter pack 2.
The seal 10 is formed of at least one elongated sealing member 19 that is fastened in the circumferential groove 11 by means of an adhesive 12 that is provided in the circumferential groove 11 between said at least one separate horizontally arranged and vertically movable filter plate 3 and said at least one elongated sealing member 19.
An advantage is that adhesive 12 provides for additional sealing.
Another advantage is that a seal 10 of simple and less expensive construction can be used.
Another advantage is that the adhesive 12 provides for additional sealing by preventing fluid from passing between said at least one elongated sealing member 19 and the surface of the vertical pressure filter 1 to which said at least one elongated sealing member 19 is fastened.
Said at least one separate horizontally arranged and vertically movable filter plate 3 may, as shown in the figures, comprise a bottom plate 13, a frame 14 below the bottom plate 13, and an elastic and waterproof diaphragm 15 attached between the bottom plate 13 and the frame 14. In such case, the filter chamber 8 is in the closed state limited by the elastic and waterproof diaphragm 15, the endless movable filter fabric belt 6 and the frame 14 so that the filter chamber 8 has a volume. In such case, the vertical pressure filter 1 comprises inflating means for inflating fluid such as liquid or gas between the elastic and waterproof diaphragm 15 and the bottom plate 13 to reduce the volume of the filter chamber 8 in the closed state.
If said at least one separate horizontally arranged and vertically movable filter plate 3 comprise a bottom plate 13, a frame 14 below the bottom plate 13, and an elastic and waterproof diaphragm 15 attached between the bottom plate 13 and the frame 14, the filter chamber 8 may, as shown in the figures, be horizontally limited by the frame 14
If said at least one separate horizontally arranged and vertically movable filter plate 3 comprise a bottom plate 13, a frame 14 below the bottom plate 13, and an elastic and waterproof diaphragm 15 attached between the bottom plate 13 and the frame 14, the lower surface 4 of at least one separate horizontally arranged and vertically movable filter plate 3 may, as shown in the figures, be formed at the frame 14.
If said at least one separate horizontally arranged and vertically movable filter plate 3 comprise a bottom plate 13, a frame 14 below the bottom plate 13, and an elastic and waterproof diaphragm 15 attached between the bottom plate 13 and the frame 14, the frame 14 may, as shown in the figures, comprise channels for feeding material to be filtered such as slurry and fluids such as water and air into the filter chamber 8 in the closed state.
If said at least one separate horizontally arranged and vertically movable filter plate 3 comprise a bottom plate 13, a frame 14 below the bottom plate 13, and an elastic and waterproof diaphragm 15 attached between the bottom plate 13 and the frame 14, the bottom plate 13 may comprise a drainage screen 16 for supporting the endless movable filter fabric belt 6 and a drainage channel 18 in fluid connection with the drainage screen 16 for leading filtrate from the drainage screen 16 to the outside of the bottom plate 13, as shown in the figures.
The vertical pressure filter 1 comprises preferably, but not necessarily, retainers 17 for keeping said at least one elongated sealing member 19in the circumferential groove 11. The purpose of such retainers 17 is to assure that said at least one elongated sealing member 19is in correct position and/or to provide for additional retaining action for keeping said at least one elongated sealing member 19 in the circumferential groove 11.
The seal 10 is preferably, but not necessarily, formed of a single elongated sealing member 19. An advantage with forming the seal 10 of a single elongated sealing member 19 is that less joints, possible only one joint, is formed in the seal 10, where the seal 10 can fail. To fasten a seal 10 in the form of a single elongated sealing member 19 by means of adhesive 12 is also quick and easy.
Said at least on elongated sealing member 19 comprises preferably, but not necessarily, adhesive 12, wherein said at least one elongated sealing member 19 comprising a base portion 20, a ridge portion 21, and an intermediate portion 22 between the base portion 20 and the ridge portion 21, wherein the base portion 20 comprising a plane side 29, wherein the base portion 20 having opposite fastening portions 23 extending in traverse directions in relation to a longitudinal direction of said at least one elongated sealing member 19, and wherein the adhesive 12 being provided between the plane side 29 of said at least one elongated sealing member 19 and the filter plate. An advantage with at least one elongated sealing member 19 having such configuration is that the ridge portion 21 can adapt to the form of the upward facing surface section 9 of the endless movable filter fabric belt 6 and prevents effectively gaps to be formed between said at least one elongated sealing member 19 and the upward facing surface section 9 of the endless movable filter fabric belt 6. Another advantage is that the intermediate portion 22 forms a large portion of said at least one elongated sealing member 19that presses against the upward facing surface section 9 of the endless movable filter fabric belt 6 in the closed state of the filter pack 2. Said at least one elongated sealing member 19 is preferably, but not necessarily, symmetrical with respect to a center plane X that is vertical to the plane side 29 of said at least one elongated sealing member 19.
The circumferential groove 11 in the lower surface 4 of at least one separate horizontally arranged and vertically movable filter plate 3 has preferably, but not necessarily, third opposite side planes 32 and a plane surface 33 between the third opposite side planes 32.
Next the elongated sealing member 19 for use in the method and in the vertical pressure filter 1 and some embodiments and variants of the elongated sealing member 19 will be described in greater detail.
The elongated sealing member 19 comprises adhesive 12.
The elongated sealing member 19 comprises a base portion 20, a ridge portion 21, and an intermediate portion 22 between the base portion 20 and the ridge portion 21.
The base portion 20 comprises a plane side 29
The base portion 20 has opposite fastening portions 23 extending in traverse directions in relation to a longitudinal direction of the elongated sealing member 19.
The adhesive 12 is provided at the plane side 29 of the base portion 20.
An advantage with an elongated sealing member 19 having such configuration is that the ridge portion 21 can adapt to the form of the upward facing surface section 9 of the endless movable filter fabric belt 6 and prevents effectively gaps to be formed between the elongated sealing member 19and the upward facing surface section 9 of the endless movable filter fabric belt 6. Another advantage is that the intermediate portion 22 forms a large portion of the elongated sealing member 19that presses against the upward facing surface section 9 of the endless movable filter fabric belt 6 in the closed state of the filter pack 2. An advantage is that adhesive 12 provides for additional sealing preventing fluid from passing between the elongated sealing member 19 and the surface of the vertical pressure filter 1 to which the elongated sealing member 19 is fastened. An advantage is that the adhesive 12 on the elongated sealing member 19 facilitates fastening of the elongated sealing member 19.
The elongated sealing member 19 is preferably, but not necessarily, completely formed of elastically deformable material. An advantage of this is that the elongated sealing member 19 can easily adapt to the form of the upward facing surface section 9 of the endless movable filter fabric belt 6, because the elongated sealing member 19 contains no elastically undeformable parts such as parts of metal.
The outer surface of the elongated sealing member 19 is preferably, but not necessarily, completely formed of elastically deformable material. An advantage of this is that the elongated sealing member 19 can easily adapt to the form of the upward facing surface section 9 of the endless movable filter fabric belt 6. In such case the elongated sealing member 19 is preferably, but not necessarily, free of metal.
The base portion 20 has preferably, but not necessarily, a rectangular cross section. An advantage of this is that a rectangular cross section facilitates mounting of the elongated sealing member 19. Another advantage of this is that a rectangular cross section creates an even pressure on the plane side 29 of the base portion 20, which means that the adhesive 12 is evenly pressed already when the filter plates 3 for the first time are brought into the closed state.
The base portion 20 has preferably, but not necessarily, first opposite side planes 30, which are essentially perpendicular with respect to the plane side 29 of the base portion 20. An advantage of this is that it facilitates mounting of the elongated sealing member 19. Another advantage of this is that the first opposite can press against vertical side walls of the he circumferential groove 11 in said filter plate.
The height A of the base portion 20 as measured in a direction perpendicular to the plane side 29 of the base portion 20 can be between 1 and 5 mm, preferable between 1 and 3 mm, such as about 2 mm.
The width B of the base portion 20 as measured in a direction along to the plane side 29 of the base portion 20 can be between 40 and 50 mm, preferable between 42 and 46 mm, such as about 44 mm. An advantage of this is that the width B of the base portion 20 is so wide that the elongated sealing member 19 can centralize itself in a circumferential groove 11 in a lower surface 4 of a horizontally arranged and vertically movable filter plate 3 by pressing against possible third opposite side planes 32 in the circumferential groove 11 in the lower surface 4 of the horizontally arranged and vertically movable filter plate 3. Another advantage of this is that the width B of the base portion 20 is so wide that opposite fastening portions 23 of the base portion 20 can more easily reach under possible retainers 17 provided for keeping the elongated sealing member 19 in the circumferential groove 11 in the lower surface 4 of the horizontally arranged and vertically movable filter plate 3. Another advantage of this is that the width B of the base portion 20 is so wide that a large plane side 29 is created for adhesive 12, which presses against a possible plane surface 33 forming a bottom of the circumferential groove 11 in the lower surface 4 of the horizontally arranged and vertically movable filter plate 3, which in turn increases the sealing effect between the elongated sealing member 19 and the horizontally arranged and vertically movable filter plate 3. Another advantage of this is that the width B of the base portion 20 is so wide that a large plane side 29 is created for adhesive 12, so that the adhesive better can retain the elongated sealing member 19 in the circumferential groove 11 in the lower surface 4 of the horizontally arranged and vertically movable filter plate 3.
Adhesive 12 is preferably, but not necessarily, provided on 30 to 100 , such as on 75 to 95 , of the plane side 29 of the base portion 20 of the elongated sealing member 19.
The intermediate portion 22 can have a partly undulating profile between the ridge portion 21 and the base portion 20.
The intermediate portion 22 can have a rounded edge at the base portion 20. The radius of the rounded edge can be between 1 and 3 mm, preferably about 2 mm.
The intermediate portion 22 may have opposite second opposite side planes 31, which extend essentially perpendicularly to the plane side 29 of the base portion 20. An advantage of this is that such configuration of the intermediate portion 22 makes distribution of pressure even on the adhesive 12 when the filter plates 3 are brought into the closed state.
The height C of the intermediate portion 22 as measured in a direction perpendicular to the plane side 29 of the base portion 20 may be between 7 and 13 mm, preferably between 8 and 10 mm, such as about 9 mm. An advantage of this is that the intermediate portion 22 on one hand is so high that a sufficient pressure is subjected on the adhesive 12, but that the intermediate portion 22 on the other hand is so low that the ridge portion 21 can have a sufficient height to effectively press against the upward facing surface section 9 of the endless movable filter belt fabric 7.
The width D of the intermediate portion 22 as measured in a direction parallel with the plane side 29 of the base portion 20 may be between 30 and 40 mm, preferably between 32 and 38 mm, such as 36 mm. An advantage of this is that the intermediate portion 22 on one hand is so wide that a pressure is subjected on the adhesive 12 on a large area.
The intermediate portion 22 may, as shown in figures 6 to 12, comprise a first intermediate section 24 between the base portion 20 and the rounded ridge portion 21, and a second intermediate section 25 between the first intermediate section 24 and the base portion 20. The height E of the first intermediate section 24 may be between 2 and 5 mm, preferably between 2 and 4 mm, such as about 3 mm, and the height F of the second intermediate section 25 may be between 5 and 8 mm, preferably between 5 and 7 mm, such as about 6 mm.
The ridge portion 21 may be a rounded ridge portion 21. An advantage of this is a durable and wear-resistant ridge portion 21.
The height G of the ridge portion 21 as measured in a direction perpendicular to the plane side 29 of the elongated sealing member 19 may be between 1 and 4 mm, preferable between 1 and 3 mm, such as about 2 mm.
The width H of the ridge portion 21 as measured in a direction in parallel with the plane side 29 of the elongated sealing member 19 may be between 1 and 4 mm, preferable between 1 and 3 mm, such as about 2 mm.
The adhesive 12 may be being protected by a removable strip. An advantage of this is easy attachment of the elongated sealing member 19. The elongated sealing member 19 is preferably, but not necessarily, of one-piece construction. An advantage with forming the seal 10 of a single elongated sealing member 19 is that less joints, possible only one joint, is formed in the seal 10, where the seal 10 can fail. To fasten seal in the form of a single elongated sealing member 19 by means of adhesive 12 is also quick and easy.
The elongated sealing member 19 comprises preferably, but no necessarily, a material having Shore A hardness between 40 and 100, preferably between 50 and 90.
The opposite fastening portions 23 of the base portion 20 may be at least partly formed of elongated metal profiles 26, as in the first alternative embodiment shown in figures 9 and 10.
The elongated sealing member 19 may, as in the second alternative embodiment shown in figures 11 and 12, comprise a first material 27 having Shore A hardness between 50 and 150, preferably between 90 and 150, and a second material 28 having Shore A hardness between 40 and 100, preferably between 50 and 90, so that by at least the opposite fastening portions 23 of the base portion 20 being made of the first material 27. An advantage of this is that a first material 27 having such hardness provides for sufficient flexible deformability to facilitate mounting of the elongated sealing member 19 but for sufficient rigidity to maintain the form of the base portion 20 elongated sealing member 19 and that a second material 28 having such flexible deformability to provide for sufficient sealing action.
The elongated sealing member 19 may comprise a first material 27 having Shore A hardness between 50 and 150, preferably between 90 and 150, and a second material 28 having Shore A hardness between 40 and 100, preferably between 50 and 90, so that by at least the ridge portion 21 being made of the second material 28. In such case, the elongated sealing member 19 is preferably, but not necessarily, made by first extruding one of the first material 27 and the second material 28 and thereafter by extruding the other of the first material 27 and the second material 28 onto said one of the first material 27 and the second material 28. In such case, the first material 27 is preferably, but not necessarily, in direct contact with the second material 28 i.e. without any intermediate material such as adhesive between the first material 27 and the second material 28. An advantage of this is that the structure of the elongated sealing member intact, which has the advantage that fluids cannot leak through the elongated sealing member 19.
The elongated sealing member 19 comprising any of the following: Natural rubber (NR),
Styrene butadiene rubber (SBR), Butyl rubber (IIR), Nitrile rubber (NBR), Epichlorohydrin rubber (ECO, CO), Chloroprene rubber (CR), Urethane rubber (U), Fluoro rubber (FPM), Silicone rubber (Q), Chlorsulphonated polyethylene rubber (CSM), Ethylene propylene rubber (EPDM), Styrenic block copolymers (TPE-s), Polyolefin blends (TPE-o), Elastomeric alloys (TPE-v or TPV), Thermoplastic polyurethanes (TPU), Thermoplastic copolyester, and Thermoplastic polyamides.
The adhesive 12 is preferably, but not necessarily, elastically deformable after curing to withstand alternating opening state and closing state of the filter pack 2.
The adhesive 12 is preferably, but not necessarily, selected so that it can attach to elastomers and metals.
The adhesive 12 is preferably, but not necessarily, selected so that it retains its adhesive function at a temperature range between -10 and 90°C.
The adhesive 12 comprises preferably, but not necessarily, any of the following: an heat- activated adhesive, an heat- activated tape, an acrylic foam adhesive, and an acrylic foam tape.
In an embodiment, the adhesive 12 is bonded to the elongated sealing member 19 by heat- activation. The heat- activated adhesive guarantees a durable none especially, but not excluding others, to elongated sealing members 19 made of EPDM and TPE rubber.
In an embodiment, the adhesive 12 is an acrylic foam tape. Based on the visco-elastic consistence of acrylic foam tapes, a high cohesiveness combined with a brilliant shock- and weathering resistance is achieved.
The elongated sealing member 19 is preferably, but not necessarily, symmetrical with respect to a center plane X that is vertical to the plane side 29,
It is apparent to a person skilled in the art that as technology advanced, the basic idea of the invention can be implemented in various ways. The invention and its embodiments are therefore not restricted to the above examples, but they may vary within the scope of the claims.

Claims

Claims
1. A method for sealing a vertical pressure filter (1) comprising a filter pack (2) comprising a plurality of separate horizontally arranged and vertically movable filter plates (3), each having a lower surface (4) and an upper surface (5), an endless movable filter fabric belt (6) arranged in zigzag manner between the filter plates (3), and closing and opening means (7) for vertically moving said plurality of separate horizontally arranged and vertically movable filter plates (3) against each other into a closed state of the filter pack (2) to form filter chambers (8) between the filter plates (3) and upward facing surface sections (9) of the endless movable filter fabric belt (6) and for vertically moving said plurality of separate horizontally arranged and vertically movable filter plates (3) away from each other into an open state of the filter pack (2) to open said filter chambers (8), wherein the method comprises
arranging a seal (10) in a circumferential groove (11) in the lower surface (4) of at least one separate horizontally arranged and vertically movable filter plate, and
pressing the seal against an upward facing surface section (9) of the endless movable (6) filter fabric belt in the closed state of the filter pack (2) by means of the closing and opening means (7),
characterized
by forming the seal (10) of at least one elongated sealing member (19), and
by fastening said at least one elongated sealing member (19) in the circumferential groove (11) by means of adhesive (12) that is provided in the circumferential groove (11) between said at least one separate horizontally arranged and vertically movable filter plate (3) and said at least one elongated sealing member (19).
2. The method according to claim 1, characterized
by providing retainers (17) for keeping said at least one elongated sealing member (19) in the circumferential groove (11).
3. The method according to claim 1 or 2, characterized
by forming the seal (10) of a single elongated sealing member (19).
4. The method according to any of the claims 1 to 3, characterized
by said at least one elongated sealing member (19) that is used in the method comprising adhesive (12),
by said at least one elongated sealing member (19) comprising a base portion (20), a ridge portion (21), and an intermediate portion (22) between the base portion (20) and the ridge portion (21),
by the base portion (20) comprising a plane side (29),
by the base portion (20) having opposite fastening portions (23) extending in traverse directions in relation to a longitudinal direction of said at least one elongated sealing member (19), and
by the adhesive (12) being provided between the plane side (29) of said at least one elongated sealing member (19) and the filter plate (3).
5. The method according to claim 4, characterized
by said at least one elongated sealing member (19) being symmetrical with respect to a center plane X that is vertical to the plane side (29).
6. The method according to any of the claims 1 to 5, characterized
by arranging the seal (10) in a circumferential groove (11) in the lower surface (4) of at least one separate horizontally arranged and vertically movable filter plate (3), which circumferential groove (11) having third opposite side planes (32) and a plane surface (33) between the third opposite side planes (32).
7. A vertical pressure filter (1) comprising
a filter pack (2) comprising a plurality of separate horizontally arranged and vertically movable filter plates (3), each having a lower surface (4) and an upper surface (5),
an endless movable filter fabric belt (6) arranged in zigzag manner between the filter plates (3),
closing and opening means (7) for vertically pressing said plurality of separate horizontally arranged and vertically movable filter plates (3) against each other into a closed state of the filter pack (2) to form filter chambers (8) between filter plates (3) and an upward facing surface section (9) of the endless movable filter fabric belt (6) and for vertically moving said plurality of separate horizontally arranged and vertically movable filter plates (3) away from each other into an open state of the filter pack (2) to open said filter chambers (8), and
a seal (10) arranged in a circumferential groove (11) in the lower surface (4) of at least one separate horizontally arranged and vertically movable filter plate, wherein the seal (10) is configured to press against the upward facing surface section (9) of the endless movable filter fabric belt (6) in the closed state of the filter pack (2),
characterized
by the seal (10 ) being formed of at least one elongated sealing member (19) that is fastened in the circumferential groove (11) by means of an adhesive (12) that is provided in the circumferential groove (11) between said at least one separate horizontally arranged and vertically movable filter plate (3) and said at least one elongated sealing member (19).
8. The vertical pressure filter (1) according to claim 7, characterized
by said at least one separate horizontally arranged and vertically movable filter plate (3) comprise a bottom plate (13), a frame (14) below the bottom plate (13), and an elastic and waterproof diaphragm (15) attached between the bottom plate (13) and the frame (14),
by the filter chamber (8) being in the closed state limited by the elastic and waterproof diaphragm (15), the endless movable filter fabric belt (6) and the frame (14) so that the filter chamber (8) has a volume, and
by the vertical pressure filter (1) comprises inflating means for inflating fluid such as liquid or gas between the elastic and waterproof diaphragm (15) and the bottom plate (13) to reduce the volume of the filter chamber (8) in the closed state.
9. The vertical pressure filter (1) according to claim 8, characterized
by the filter chamber (8) being horizontally limited by the frame (14).
10. The vertical pressure filter (1) according to claim 8 or 9, characterized
by the lower surface (4) of at least one separate horizontally arranged and vertically movable filter plate (3) being formed at the frame (14).
11. The vertical pressure filter (1) according to any of the claims 8 to 10, characterized
by the frame (14) comprising channels for feeding material to be filtered such as slurry and fluids such as water and air into the filter chamber (8) in the closed state.
12. The vertical pressure filter (1) according to any of the claims 8 to 11, characterized
by the bottom plate (13) comprises a drainage screen (16) for supporting the endless movable filter fabric belt (6) and a drainage channel (18) in fluid connection with the drainage screen (16) for leading filtrate from the drainage screen (16) to the outside of the bottom plate (13).
13. The vertical pressure filter (1) according to any of the claims 7 to 12, characterized
by retainers (17) for keeping said at least one elongated sealing member (19) in the circumferential groove (11).
14. The vertical pressure filter (1) according to any of the claims 7 to 13, characterized
by the seal (10) being in the form of a single elongated sealing member (19).
15. The vertical pressure filter (1) according to any of the claims 7 to 14, characterized
by said at least one elongated sealing member (19) comprising adhesive (12),
by said at least one elongated sealing member (19) comprising a base portion (20), a ridge portion (21), and an intermediate portion (22) between the base portion (20) and the ridge portion (21), by the base portion (20) comprising a plane side (29),
by the base portion (20) having opposite fastening portions (23) extending in traverse directions in relation to a longitudinal direction of said at least one elongated sealing member (19), and
by the adhesive (12) being provided between the plane side (29) of said at least one elongated sealing member (19) and the filter plate (3).
16. The vertical pressure filter (1) according to any of the claims 7 to 15, characterized
by said at least one elongated sealing member (19) being symmetrical with respect to a center plane X that is vertical to the plane side (29).
17. The vertical pressure filter (1) according to any of the claims 7 to 16, characterized
by the circumferential groove (11) in the lower surface (4) of at least one separate horizontally arranged and vertically movable filter plate (3) having third opposite side planes (32) and a plane surface (33) between the third opposite side planes (32).
18. An elongated sealing member (19) for use in method according to any of the claims 1 to 6 or in a vertical pressure filter (1) according to any of the claims 7 to 17, characterized
by the elongated sealing member (19) comprising adhesive (12),
by the elongated sealing member (19) comprising a base portion (20), a ridge portion (21), and an intermediate portion (22) between the base portion (20) and the ridge portion (21), by the base portion (20) comprising a plane side (29),
by the base portion (20) having opposite fastening portions (23) extending in traverse directions in relation to a longitudinal direction of the elongated sealing member (19), and
by the adhesive (12) being provided at the plane side (29) of the base portion (20).
19. The elongated sealing member (19) according to claim 18, characterized
by the elongated sealing member (19) being completely formed of elastically deformable material.
20. The elongated sealing member (19) according to claim 18, characterized
by the outer surface of the elongated sealing member (19) being completely formed of elastically deformable material.
21. The elongated sealing member (19) according to claim 20, characterized
by the elongated sealing member (19) being free of metal.
22. The elongated sealing member (19) according to any of the claims 18 to 21, characterized
by the base portion (20) having a rectangular cross section.
23. The elongated sealing member (19) according to any of the claims 18 to 22, characterized
by the base portion (20) having first opposite side planes (30), which are essentially perpendicular with respect to the plane side (29) of the base portion (20).
24. The elongated sealing member (19) according to any of the claims 18 to 23, characterized
by the height A of the base portion (20) as measured in a direction perpendicular to the plane side (29) of the base portion (20) being between 1 and 5 mm, preferable between 1 and 3 mm, such as about 2 mm.
25. The elongated sealing member (19) according to any of the claims 18 to 24, characterized
by the width B of the base portion (20) as measured in a direction along to the plane side (29) of the base portion (20) being between 40 and 50 mm, preferable between 42 and 46 mm, such as about 44 mm.
26. The elongated sealing member (19) according to any of the claims 18 to 25, characterized
by the intermediate portion (22) having opposite second opposite side planes (31), which extend essentially perpendicularly to the plane side (29) of the base portion (20).
27. The elongated sealing member (19) according to any of the claims 18 to 26, characterized
by the height C of the intermediate portion (22) as measured in a direction perpendicular to the plane side (29) of the base portion (20) being between 7 and 13 mm, preferably between 8 and 10 mm, such as about 9 mm.
28. The elongated sealing member (19) according to any of the claims 18 to 27, characterized
by the width D of the intermediate portion (22) as measured in a direction parallel with the plane side (29) of the base portion (20) being between 30 and 40 mm, preferably between 32 and 38 mm, such as 36 mm.
29. The elongated sealing member (19) according to any of the claims 18 to 28, characterized
by the ridge portion (21) being a rounded ridge portion (21).
30. The elongated sealing member (19) according to any of the claims 18 to 29, characterized
by the height G of the ridge portion (21) as measured in a direction perpendicular to the plane side (29) of the elongated sealing member (19) being between 1 and 4 mm, preferable between 1 and 3 mm, such as about 2 mm.
31. The elongated sealing member (19) according to any of the claims 18 to 30, characterized
by the width H of the ridge portion (21) as measured in a direction in parallel with the plane side (29) of the elongated sealing member (19) being between 1 and 4 mm, preferable between 1 and 3 mm, such as about 2 mm.
32. The elongated sealing member (19) according to any of the claims 18 to 31, characterized
by the adhesive (12) being protected by a removable strip.
33. The elongated sealing member (19) according to any of the claims 18 to 32, characterized
by the elongated sealing member (19) being of one-piece construction.
34. The elongated sealing member (19) according to any of the claims 18 to 33, characterized
by the elongated sealing member (19) comprising a material having Shore A hardness between 40 and 100, preferably between 50 and 90.
35. The elongated sealing member (19) according to any of the claims 18 to 34, characterized
by the opposite fastening portions (23) of the base portion (20) being at least partly formed of elongated metal profiles (26).
36. The elongated sealing member (19) according to any of the claims 18 to 33, characterized
by the elongated sealing member (19) comprising a first material (27) having Shore A hardness between 50 and 150, preferably between 90 and 150, by the elongated sealing member (19) comprising a second material (28) having Shore A hardness between 40 and 100, preferably between 50 and 90, and
by at least the opposite fastening portions (23) of the base portion (20) being made of the first material (27).
37. The elongated sealing member (19) according to any of the claims 18 to 33, characterized
by the elongated sealing member (19) comprising a first material (27) having Shore A hardness between 50 and 150, preferably between 90 and 150,
by the elongated sealing member (19) comprising a second material (28) having Shore A hardness between 40 and 100, preferably between 50 and 90, and
by at least the ridge portion (21) being made of the second material (28).
38. The elongated sealing member (19) according to any of the claims 18 to 37, characterized
by the elongated sealing member (19) comprising any of the following: Natural rubber (NR), Styrene butadiene rubber (SBR), Butyl rubber (IIR), Nitrile rubber (NBR), Epichlorohydrin rubber (ECO, CO), Chloroprene rubber (CR), Urethane rubber (U), Fluoro rubber (FPM), Silicone rubber (Q), Chlorsulphonated polyethylene rubber (CSM), Ethylene propylene rubber (EPDM), Styrenic block copolymers (TPE-s), Polyolefin blends (TPE-o), Elastomeric alloys (TPE-v or TPV), Thermoplastic polyurethanes (TPU), Thermoplastic copolyester, and Thermoplastic polyamides.
39. The elongated sealing member (19) according to any of the claims 18 to 38, characterized by the elongated sealing member (19) being symmetrical with respect to a center plane X that is vertical to the plane side (29).
40. The elongated sealing member (19) according to any of the claims 18 to 39, characterized
by the adhesive (12) comprising any of the following: an heat- activated adhesive, an heat- activated tape, an acrylic foam adhesive, and an acrylic foam tape.
PCT/FI2016/050727 2015-10-19 2016-10-18 Elongated sealing member for a vertical pressure filter, vertical pressure filter and method of using the sealing WO2017068242A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20155744 2015-10-19
FI20155744A FI20155744A (en) 2015-10-19 2015-10-19 PROCEDURE FOR SEALING A VERTICAL FILTER PRESSURE, VERTICAL FILTER PRESSURE, AND LONG-TERM SEAL FOR USE IN THE PROCEDURE AND VERTICAL FILTER PRESSURE

Publications (1)

Publication Number Publication Date
WO2017068242A1 true WO2017068242A1 (en) 2017-04-27

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WO (1) WO2017068242A1 (en)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
EP4135869A4 (en) * 2020-04-17 2023-12-27 Metso Outotec Finland Oy A sealing strip for sealing adjacent filter plate assemblies of a filter press, such as a tower press, a filter frame, a filter frame assembly and a filter apparatus

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111054106A (en) * 2018-10-17 2020-04-24 张晓春 Radial sealing method and device for filter pressing device

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GB655076A (en) * 1947-02-24 1951-07-11 Cherry Burrell Corp Improvements in or relating to gaskets for plate apparatus in particular plate type heat exchangers or filter presses
DE2109021A1 (en) * 1970-03-02 1971-09-30 Fischer, Helmut, Ing.; Fischer, Gerhard, Ing.; Wien Multilayer filter pack of pressed steel plates
US4274961A (en) * 1976-11-08 1981-06-23 Gene Hirs Pressure filter
DE3315500A1 (en) * 1983-04-28 1984-10-31 Grau Feinwerktechnik GmbH & Co, 7926 Böhmenkirch Membrane filter press
WO1996024423A1 (en) * 1995-02-09 1996-08-15 Scapa Group Plc Filtration apparatus
WO2010121827A1 (en) * 2009-04-24 2010-10-28 Klinkau Gmbh + Co. Plate component for a filter press system
CN104399294A (en) * 2014-11-20 2015-03-11 长兴星盛新材料有限公司 Filter press plate for chamber filter press

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Publication number Priority date Publication date Assignee Title
GB655076A (en) * 1947-02-24 1951-07-11 Cherry Burrell Corp Improvements in or relating to gaskets for plate apparatus in particular plate type heat exchangers or filter presses
DE2109021A1 (en) * 1970-03-02 1971-09-30 Fischer, Helmut, Ing.; Fischer, Gerhard, Ing.; Wien Multilayer filter pack of pressed steel plates
US4274961A (en) * 1976-11-08 1981-06-23 Gene Hirs Pressure filter
DE3315500A1 (en) * 1983-04-28 1984-10-31 Grau Feinwerktechnik GmbH & Co, 7926 Böhmenkirch Membrane filter press
WO1996024423A1 (en) * 1995-02-09 1996-08-15 Scapa Group Plc Filtration apparatus
WO2010121827A1 (en) * 2009-04-24 2010-10-28 Klinkau Gmbh + Co. Plate component for a filter press system
CN104399294A (en) * 2014-11-20 2015-03-11 长兴星盛新材料有限公司 Filter press plate for chamber filter press

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4135869A4 (en) * 2020-04-17 2023-12-27 Metso Outotec Finland Oy A sealing strip for sealing adjacent filter plate assemblies of a filter press, such as a tower press, a filter frame, a filter frame assembly and a filter apparatus

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