CA2510282A1 - Filter sector, decal strip and shower system for disk filters - Google Patents
Filter sector, decal strip and shower system for disk filters Download PDFInfo
- Publication number
- CA2510282A1 CA2510282A1 CA002510282A CA2510282A CA2510282A1 CA 2510282 A1 CA2510282 A1 CA 2510282A1 CA 002510282 A CA002510282 A CA 002510282A CA 2510282 A CA2510282 A CA 2510282A CA 2510282 A1 CA2510282 A1 CA 2510282A1
- Authority
- CA
- Canada
- Prior art keywords
- filter
- shower
- sector
- housing
- disk
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/02—Washing ; Displacing cooking or pulp-treating liquors contained in the pulp by fluids, e.g. wash water or other pulp-treating agents
- D21C9/06—Washing ; Displacing cooking or pulp-treating liquors contained in the pulp by fluids, e.g. wash water or other pulp-treating agents in filters ; Washing of concentrated pulp, e.g. pulp mats, on filtering surfaces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/15—Filters with filtering elements which move during the filtering operation with rotary plane filtering surfaces
- B01D33/21—Filters with filtering elements which move during the filtering operation with rotary plane filtering surfaces with hollow filtering discs transversely mounted on a hollow rotary shaft
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/15—Filters with filtering elements which move during the filtering operation with rotary plane filtering surfaces
- B01D33/21—Filters with filtering elements which move during the filtering operation with rotary plane filtering surfaces with hollow filtering discs transversely mounted on a hollow rotary shaft
- B01D33/23—Construction of discs or component sectors thereof
-
- 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
- B01D33/44—Regenerating the filter material in the filter
- B01D33/46—Regenerating the filter material in the filter by scrapers, brushes nozzles or the like acting on the cake-side of the filtering element
- B01D33/463—Regenerating the filter material in the filter by scrapers, brushes nozzles or the like acting on the cake-side of the filtering element nozzles
-
- 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
- B01D33/44—Regenerating the filter material in the filter
- B01D33/46—Regenerating the filter material in the filter by scrapers, brushes nozzles or the like acting on the cake-side of the filtering element
- B01D33/466—Regenerating the filter material in the filter by scrapers, brushes nozzles or the like acting on the cake-side of the filtering element scrapers
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water
Abstract
A filter sector comprises first and second sector facings secured in opposed relationship to one another to define a substantially open interior volume. Each sector facing has a filter support structure defining a notional filter surface, and the notional filter surfaces generally diverge from one another from the distal end to the proximal end of the filter sector. A decal strip for securing filter sectors within a filter disk comprises an elongate member having a male end, a female end corresponding to the male end, and at least one recess for receiving at least part of a distal end of a filter sector. A shower system for a disk filter includes a pair of shower bars, one for removing the fibre mat and the other for cleaning the filter membrane. Each shower bar is movable between a first position substantially within the disk filter housing and a second position substantially outside the housing. The housing can be substantially closed with any shower bar in either the first or second position.
Description
1 filter Sector, Decal Stt-ip and Shower System for Disk filters FIELD OF THE INVENTION
6 [0001] The present invention relates to disk filters 9 [0002] Disk filters are well known, and are used, for example, in the pulp and paper industry and the ore processing industry. In the pulp and paper industry, disk filters are frequently used to 11 dewater (i.e. remove water from) wood and paper fibres. Typically, a disk filter comprises a 12 housing and a series of filter discs, each of which is made up of a plurality of filter sectors. The 13 filter discs are mounted on and in fluid communication with a central conduit adapted to rotate 14 within the housing. A slurry is introduced into the housing, and suction is applied to the central conduit, causing a layer of material to adhere to the filter discs. As the disks rotate out of the 16 slurry, vacuum draws water from the slurry and the (now dewatered) material can be peeled 17 away from the filter by means of a knock off shower system and collected for further processing.
18 A further set of shower bars are typically disposed in the housing to assist in cleaning material 19 accumulated on the disks. These are called cleaning showers and are oscillating or fixed.
[0003] One problem associated with disk filters is that of "rewetting" of the material 21 accumulated on the filter membranes. Water that remains in a filter sector as it rotates out of the 22 slurry, or that has drawn out of the dewatered material, can pass back through the filter 23 membrane as it drains and therefore pass back into the layer of material that was just dewatered 24 This can sometimes prematurely cause the sheet to be peeled from the sector.
[0004] Also, because filter discs are typically large and are therefore subjected to significant 26 radial & axial forces, it is necessary to provide adequate structural strength for the disc whilst 27 retaining the functionality of the disc.
28 (0005] A ftuther problem associated with disk filters is that the nozzles of the shower bars 29 tend to become obstructed as small particles or pieces of material become lodged therein. This 21420372.1 1 necessitates frequent interruptions of the process so that the shower bars can be cleaned, which is 2 costly and inefficient.
4 SLIwiMARY OF THE INVENTION
[0006] In one aspect, the present invention is directed to a filter sector for a disk filter. The 6 filter sector has a root for securing the filter sector in fluid communication with a central conduit 7 of a disk filter and a tip remote from the root. The filter sector includes a pair of oppositely 8 directed filter support faces. The faces define a substantially open interior volume. The faces 9 diverge from one another from the tip end to the root of the filter sector.
The sides of the sectors are defined by radial flanges extending along the side edges between the tip end and the root.
11 The radial flanges are defined by progressively overlapping flanges of angle members secured to 12 one another.
13 [0007] In another aspect, the present invention is directed to a decal strip arrangement for 14 securing filter sectors in a filter disk. The decal strip arrangement includes a plurality of decal strips, each of which includes an elongate channel dimensioned to fit over the tips. The decal 16 strips are arranged as a hoop with each strip bridging a pair of adjacent sectors.
17 [0008] In another aspect, the present invention is directed to a disk filter. The disk filter 18 includes a housing, at least one filter disk mounted to rotate within the housing, at least two 19 collection chutes disposed adjacent each at least one filter disk, and generally two shower systems for directing material that has accumulated on the at least one filter disk toward a 21 collection chute and for cleaning the filter. The shower systems includes a main shower header 22 connectable in fluid communication with a source of fluid and at least two shower bars. Each of 23 the shower bars is connected in fluid communication with the main shower header. Each shower 24 bar is movable between a first position in which it is disposed substantially within the housing and proximate to at least one filter disk for applying a spray of fluid to that at least one filter 26 disk, and a second position wherein the shower bar is disposed substantially outside the housing.
27 The housing can be substantially closed when any shower bar is in either the first position or the 28 second position.
21420372.1 y ..
DESCRIPTION
OF THE
DRAV~1NGS
2 [0009] An embodiment of the invention will now be described by way of example only with 3 referenceto the appended drawings wherein:
4 [0010] Figure 1 is a side sectional view of a disk filter;
[0011] Figure 2 is a front sectional view of the disk filter of Figure 1 one the line II-II;
6 [0012] Figure 3 is a front perspective view of a filter sector;
7 [0013] Figure 4 is a cross-sectional view of the filter sector of Figure 3 taken along the line 8 IV-1V.
9 (0014] Figure 5 is a cross-sectional view of the filter sector of Figure 3 taken along the line V-V.
11 [0015] Figure 6 is a cross-sectional view of the filter sector of Figure 3 taken along the line 12 VI- VI.
13 [0016] Figure 7 is a cross-sectional view of the filter sector of Figure 3 taken along the line 14 VII-VII.
[0017] Figure 8 is a front view of twb adjacent filter sectors of Figure 3 being assembled to 16 form a disc;
17 [0018] Figure 9 is a perspective view of a decal strip used in the assembly of Figure 8;
18 [0019] Figure 10 is an enlarged view of the interconnection of a pair of decal strips;
19 (0020] Figure 11 is a perspective view of a portion of the housing of the disk filter showin in Figure 1.
21 [0021] Figure 12 is a perspective view of a portion of a housing for a disk filter with cleaning 22 shower bars in a first position;
23 [0022] Figure 13 is a perspective view on an enlarged scale of the cleaning shower bar of 24 Figure 12;
[0023] Figure 14 is a perspective view of a portion of an alternative embodiment of a shower 26 bar;
27 (0024] Figure 1 S is a view showing the shower bar of Figure 14 in a deployed position.
28 [0025] Figure 16 is a view similar to Figure 15 showing the shower bar in a withdrawn 29 position.
21420372.1 i, ..
1 DESCRIPTION OF THE PREFERRED' EMBODIMENTS
2 [0026] With reference to Figures 1 and 2, a disk filter is indicated generally at 1000. The 3 disk filter 1000 comprises a housing 10012 and a plurality of filter discs 1004 mounted co-axially 4 on a hollow central conduit 1006. As rain be seen in Figure 2, each filter disk 1004 is made up from a plurality of individual filter sectors 1008 mounted to the central conduit 1006. The 6 interior of each sector 1008 is connected to the interior of the central conduit 1006 by fluid 7 passages 1010. The front and rear surface of each filter sector 1008 carries a filter membrane 8 1012 that allows fluid to flow to the interior but inhibits passage of fibre. A motor 1014 rotates 9 conduit and thus the filter disc 1004 within the housing 1002. The conduit 1006 is connected to a vacuum source that is selectively connected to the interior of each segment as it rotates.
11 Collection chutes 1016 are aligned with each filter disk 1004 and extend through the bottom of 12 the housing 1002 to a removal path 1017. Two sets of shower bars 1018, 1019 are disposed 13 above the filter disc 1004 to spray on to the disks and remove the fibre.
One set, 1018 is used to 14 remove product from the sector and the other set, 1018 is used to clean any remaining product.
[0027] In operation, a volume of slurry 1020, for example a slurry of water and wood or 16 paper fibres, is directed into the housing 1002. As can be seen in Figures 1 and 2, the collection 17 chutes 1016 extend well above the level ~of the slurry 1020. Suction is applied to the central 18 conduit 1006 and as the filter discs 1004'rotate through the slurry 1020, the suction draws the 19 slurry towards the submerged filter sectors 1008. This causes a layer of material, in this case fibres, to accumulate on the filter membrane 1012 as the water is drawn through the filter 21 membrane 1012, in the filter sector 1008 and through the fluid passage 1010 into the central 22 conduit 1006.
23 [0028] As the filter discs 1004 continues to rotate, the filter sectors 1008 that were 24 submerged in the slurry 1020 emerge intb the atmosphere within the housing 1002, with the layer of fibres still adhered to the filter membrane 1012. The suction applied through the conduit 1006 26 draws liquid through the membrane 1012 to reduce the water content of the fibres as they rotate.
27 As a sector rotates, the suction is removed from the interior of that segment and when the filter 28 sectors 1008 rotate into alignment with the knock off shower 1018 and the collection chutes 29 1016, fluid spray from the shower 1018 assists in peeling the fibre layers away from the filter membranes 1012 and fall into the collection chutes 1016. The (now dewatered) fibres then fall 21420372.1 i, ..
1 by gravity down to the fibre removal path 1017, where the fibres are then conveyed by an 2 appropriate mechanism, such as a screw knot shown) to another location for further processing.
3 Continued rotation of the disc brings the', sector to the cleaning shower 1019 which removes any 4 remaining fibres from the filter membral~e 1012.
7 [0029] As best seen in figure 3, each of the filter sectors 1008 has a body 10 with an inner 8 end or root 12 located adjacent to the colriduit 1006 and a radially outer tip 11. The body 10 has 9 oppositely directed front and rear faces 14, 15 that converge from the root 12 to the tip 11 and a pair of side faces 24 that interconnect thd front and rear faces 14, 15.
11 [0030] The faces 14, 15, 24 define a hollow interior 19 and radial ribs 16 extend between the 12 front and rear faces 14, 15 to provide additional support. The ribs 16 and side faces 24 are 13 interconnected by lateral supports 18 to define and open core for the body 10. The lateral 14 supports 18 are offset from one another can the faces 14, 15 to rrlinimise impediment to follow within the interior 19. The root 12 is provided with a gusset 20 to enhance the structural rigidity 16 of the inner end. A flange 22 extends from the gusset 20 to provide a mechanical connection to 17 the central conduit 1006.
18 [0031] The side faces 24 and ribs 16 are formed from a pair of overlapping angle pieces 30, 19 32 each having a pair of flanges 34, 36. The flanges 36 overlap one another in an axial plane with the overlap increasing from the rood 12 to the tip 11 to define tapered channels extending 21 from the tip to the root. The angle pieces 30, 32 are typically made of stainless steel and are spot 22 welded to one another at spaced intervals along their length. The angle pieces thus provide 23 tapering open channels extending from the tip 11 to the root 12.
24 [0032] The lateral supports 18 are also made of L-shaped stock oriented to have one flange 21 lying in the plane of front or rear face 14, 15 and the other 23 projecting axially into the 26 interior. The convergence of the faces 14, 15 causes the flange 23 to be downwardly and 27 inwardly inclined to promote the flow ofwater into the cavity 19. At the intersection of the ribs 28 16 and lateral supports 18, the flange 23 bf the stock is folded flat through a piercing and coining 29 operation so that a generally planar suppprt grid is formed on each face 14, 15 to support the membrane 1012. The membrane 1012 extends to the gusset 20 which is dimensioned to extend 21420372.1 1 radially beyond the collection chute 1016. This permits the membrane 1012 to be terminated at a 2 position to avoid contact with the chute.
3 [0033] The tips 11 of the sectors 1008 are connected to one another by a hoop structure 4 formed from interconnected decal strips '100 as best seen in figures 8, 9, and 10. Bach of the decal strips 100 is formed from a channel member 102 dimensioned to fit over the tip 11 of the 6 sectors 1008. The channel member 102 is cranked at its mid point, as indicated at 104, to 7 conform to the transition between adjacent sectors 1008. A slot 106 is formed in the channel 8 member 102 at one end and a connector 108 extends from the opposite end. The connector 108 9 is a channel member sized to fit over the channel member 102 and has a transverse hole 110 extending through the side walls. The hole 110 is positioned to align with the slot 106 of an 11 adjacent decal snip 102 to allow the members to be connected into a hoop.
In some 12 embodiment, the tips of the sectors 1008' are curved with a uniform radius, in which case the 13 decal strips 100 are not cranked but are c~f complementary uniformly curved formation to bridge 14 adjacent sectors.
[0034] When assembled on the filter wheel, each decal strip 100 is placed over the tips of a 16 pair of adjacent sectors so as to bridge the sectors. The decal strips are connected end to end 17 around the periphery of the wheel by a bolt 112 that passes through the slot 106 and hole 108.
18 The bolt 112 also passes through a hole 113 in the tip 11 and is secured by a nut 114 that is 19 preferably a single use aircraft nut that is suitable for use in corrosive environments. With the decal strips 100 secured, an outer hoop i$ provided that mechanically connects the sectors 1008 21 and inhibits relative movement.
22 [0035] In the operation, as the filter disc rotates the bending stresses imposed on individual 23 sectors is distributed through the decal strips into the adjacent sectors.
The converging faces 14, 24 15 also assist in preventing water from pissing back through the membrane as it moves towards the vacuum conduit 1006. The channel formed by the overlapping angle members in the sides 26 and ribs in directing water to the outlet v~iithout contacting the membrane and the lateral supports 27 18 similarly provide an open structure that does not impede the flow of water with the vane.
21420372.1 i, 2 [0036] As noted above, a disk filter includes a housing and a plurality of showers 1018, 1019 3 for assisting in the peeling of accumulated material away from the filter membrane of a filter 4 disk so that the material falls into a collection chute and for cleaning the fabric to begin another cycle. Now referring to Figure 11, the housing 200 comprises a main housing body 202 and an 6 access door 204.
7 (0037] Each of the showers 1018, 1019 includes a plurality of shower units 206 connected at 8 spaced intervals to a header 208 extendirng along the exterior of the housing 202. Each of the 9 shower units 206 is similar in construction and therefore only one will be described in detail.
[0038] Each of the shower unit 206 teas a U-shaped stand pipe 210 including a shut off valve 11 212. A quick connect coupling 214 is disposed a the end of the stand pipe for connection to a 12 shower bar 216. The coupling 214 may be of any convenient known construction such as a cap 13 and groove or a ball and groove connectpr.
14 [0039] The shower bar 216 projects through an aperture 218 provided in the door 204. In the case of the shower 1018, the shower bar '216 terminates in a nozzle 218 positioned adjacent one 16 of the filter disks to assist in peeling awaly the fibre mat. In the case of the shower 1019, the 17 shower bar has a plurality of nozzles 218 disposed along its length and projeting in opposite 18 directions onto adjacent filter disks.
19 [0040] If a nozzle 218 becomes blocked and requires routine maintenance, the shut off valve 212 may be closed to isolate the shower bar 216 which may then be released from the coupling 21 214. The shower bar may then be pulled from the housing 202 through the aperture and 22 appropriate repairs or maintenance perfo~ned. During this time, the filter disk may continue to 23 rotate and thereby avoid costly shut down of the production line. In order to replace the shower 24 bar 216 it is simply necessary to insert it through the aperture and again engage the quick release coupling 214. The supply can then be reconnected with the valve 212.
26 [0041] A further embodiment is shown in Figures 14 through 16 in which like reference 27 numerals will be used with a suffix 'a' far clarity. In the particular embodiment shown in 28 Figures 14 to 16, the shower bars 210a axe connected to the main shower header 208a so as to be 29 pivotable relative thereto. As can best b~ seen in Figure 14, at each location on the main shower header 208a where a shower bar 210a is !to be attached, a stand pipe 210a protrudes from the 21420372.1 _7_ i, ~.
1 main shower header 208 and terminates ~t a 90° elbow 220. A
compression tee 222 or similar 2 mechanical disconnect device is secured I,to the elbow 220 by way of a nut 224, which 3 arrangement permits the compression tee 222 to pivot relative to the elbow 220. A handle 226 is 4 secured in one opening in the compressi4n tee 222, and a shower bar 210a having a plurality of nozzles 218a is secured in the other branich of the compression tee 222. The elbow 220 includes 6 a shut off valve (not shown) to isolate eaich shower bar, and the nut 224 can be loosened to allow 7 the shower bar 210a to be pivoted, and tiightened to secure the shower bar 210a in the desired 8 position.
9 [0042] The door 204 can be opened end closed when the shower bars 21 Oa are in the first position as shown in Figure 15. When the door 204 is open, the shower bar 210a can be pivoted 11 from the first position shown in Figure 15 to the second position shown in Figure 16. As can be 12 seen clearly in Figure 16, the door 204 c~.n be closed when the shower bars 210a are in the 13 second position inside the housing 200. Thus, the housing 200 can be substantially closed when 14 any shower bar 210a is in either the first position or the second position.
The door 204 includes cut outs 226 to accommodate the connedtions between the shower bars 210a and the externally 16 mounted main shower header 208. Despite these recesses 226, the housing remains substantially 17 closed in the sense that the filtration process can continue.
18 [0043] When a disk filter is in operation, all of the shower bars 210a will ordinarily be in the 19 first position, that is, disposed substantially within the housing 200, and the disk filter will operate as described above. When the npzzles of one or more of the shower bars 210 become 21 obstructed, the disk filter does not have to be stopped. The relevant door or doors 204 can be 22 opened and the affected shower bar or b~.rs 210 can be moved into their second position outside 23 of the housing 200. The door or doors 204 are then closed. The affected shower bar or bars 210 24 are then isolated using the shut off valve in the elbow 220. The remaining shower bars 210 will continue to function while the affected shower bars 210 are cleaned or replaced. The clogging 26 of any shower bar will thus require no interruption to move that shower bar into its second 27 position outside the housing, where it cats be cleaned without affecting operation of the other 28 shower bars.
29 [0044] The pivotal arrangement of t)~e shower system described above is exemplary only, as there are many arrangements by which tie shower bars can be connected in fluid communication 21420372.1 _g_ 1 with the main shower header so as to be provable between a first position wherein the respective 2 shower bar is disposed substantially within the housing, and a second position in which the 3 shower bar is disposed outside the housing.
4 [0045] Although the invention has been described with reference to certain specific embodiments, various modifications thereof will be apparent to those skilled in the art without 6 departing from the spirit and scope of the invention as outlined in the claims appended hereto.
21420372.1
6 [0001] The present invention relates to disk filters 9 [0002] Disk filters are well known, and are used, for example, in the pulp and paper industry and the ore processing industry. In the pulp and paper industry, disk filters are frequently used to 11 dewater (i.e. remove water from) wood and paper fibres. Typically, a disk filter comprises a 12 housing and a series of filter discs, each of which is made up of a plurality of filter sectors. The 13 filter discs are mounted on and in fluid communication with a central conduit adapted to rotate 14 within the housing. A slurry is introduced into the housing, and suction is applied to the central conduit, causing a layer of material to adhere to the filter discs. As the disks rotate out of the 16 slurry, vacuum draws water from the slurry and the (now dewatered) material can be peeled 17 away from the filter by means of a knock off shower system and collected for further processing.
18 A further set of shower bars are typically disposed in the housing to assist in cleaning material 19 accumulated on the disks. These are called cleaning showers and are oscillating or fixed.
[0003] One problem associated with disk filters is that of "rewetting" of the material 21 accumulated on the filter membranes. Water that remains in a filter sector as it rotates out of the 22 slurry, or that has drawn out of the dewatered material, can pass back through the filter 23 membrane as it drains and therefore pass back into the layer of material that was just dewatered 24 This can sometimes prematurely cause the sheet to be peeled from the sector.
[0004] Also, because filter discs are typically large and are therefore subjected to significant 26 radial & axial forces, it is necessary to provide adequate structural strength for the disc whilst 27 retaining the functionality of the disc.
28 (0005] A ftuther problem associated with disk filters is that the nozzles of the shower bars 29 tend to become obstructed as small particles or pieces of material become lodged therein. This 21420372.1 1 necessitates frequent interruptions of the process so that the shower bars can be cleaned, which is 2 costly and inefficient.
4 SLIwiMARY OF THE INVENTION
[0006] In one aspect, the present invention is directed to a filter sector for a disk filter. The 6 filter sector has a root for securing the filter sector in fluid communication with a central conduit 7 of a disk filter and a tip remote from the root. The filter sector includes a pair of oppositely 8 directed filter support faces. The faces define a substantially open interior volume. The faces 9 diverge from one another from the tip end to the root of the filter sector.
The sides of the sectors are defined by radial flanges extending along the side edges between the tip end and the root.
11 The radial flanges are defined by progressively overlapping flanges of angle members secured to 12 one another.
13 [0007] In another aspect, the present invention is directed to a decal strip arrangement for 14 securing filter sectors in a filter disk. The decal strip arrangement includes a plurality of decal strips, each of which includes an elongate channel dimensioned to fit over the tips. The decal 16 strips are arranged as a hoop with each strip bridging a pair of adjacent sectors.
17 [0008] In another aspect, the present invention is directed to a disk filter. The disk filter 18 includes a housing, at least one filter disk mounted to rotate within the housing, at least two 19 collection chutes disposed adjacent each at least one filter disk, and generally two shower systems for directing material that has accumulated on the at least one filter disk toward a 21 collection chute and for cleaning the filter. The shower systems includes a main shower header 22 connectable in fluid communication with a source of fluid and at least two shower bars. Each of 23 the shower bars is connected in fluid communication with the main shower header. Each shower 24 bar is movable between a first position in which it is disposed substantially within the housing and proximate to at least one filter disk for applying a spray of fluid to that at least one filter 26 disk, and a second position wherein the shower bar is disposed substantially outside the housing.
27 The housing can be substantially closed when any shower bar is in either the first position or the 28 second position.
21420372.1 y ..
DESCRIPTION
OF THE
DRAV~1NGS
2 [0009] An embodiment of the invention will now be described by way of example only with 3 referenceto the appended drawings wherein:
4 [0010] Figure 1 is a side sectional view of a disk filter;
[0011] Figure 2 is a front sectional view of the disk filter of Figure 1 one the line II-II;
6 [0012] Figure 3 is a front perspective view of a filter sector;
7 [0013] Figure 4 is a cross-sectional view of the filter sector of Figure 3 taken along the line 8 IV-1V.
9 (0014] Figure 5 is a cross-sectional view of the filter sector of Figure 3 taken along the line V-V.
11 [0015] Figure 6 is a cross-sectional view of the filter sector of Figure 3 taken along the line 12 VI- VI.
13 [0016] Figure 7 is a cross-sectional view of the filter sector of Figure 3 taken along the line 14 VII-VII.
[0017] Figure 8 is a front view of twb adjacent filter sectors of Figure 3 being assembled to 16 form a disc;
17 [0018] Figure 9 is a perspective view of a decal strip used in the assembly of Figure 8;
18 [0019] Figure 10 is an enlarged view of the interconnection of a pair of decal strips;
19 (0020] Figure 11 is a perspective view of a portion of the housing of the disk filter showin in Figure 1.
21 [0021] Figure 12 is a perspective view of a portion of a housing for a disk filter with cleaning 22 shower bars in a first position;
23 [0022] Figure 13 is a perspective view on an enlarged scale of the cleaning shower bar of 24 Figure 12;
[0023] Figure 14 is a perspective view of a portion of an alternative embodiment of a shower 26 bar;
27 (0024] Figure 1 S is a view showing the shower bar of Figure 14 in a deployed position.
28 [0025] Figure 16 is a view similar to Figure 15 showing the shower bar in a withdrawn 29 position.
21420372.1 i, ..
1 DESCRIPTION OF THE PREFERRED' EMBODIMENTS
2 [0026] With reference to Figures 1 and 2, a disk filter is indicated generally at 1000. The 3 disk filter 1000 comprises a housing 10012 and a plurality of filter discs 1004 mounted co-axially 4 on a hollow central conduit 1006. As rain be seen in Figure 2, each filter disk 1004 is made up from a plurality of individual filter sectors 1008 mounted to the central conduit 1006. The 6 interior of each sector 1008 is connected to the interior of the central conduit 1006 by fluid 7 passages 1010. The front and rear surface of each filter sector 1008 carries a filter membrane 8 1012 that allows fluid to flow to the interior but inhibits passage of fibre. A motor 1014 rotates 9 conduit and thus the filter disc 1004 within the housing 1002. The conduit 1006 is connected to a vacuum source that is selectively connected to the interior of each segment as it rotates.
11 Collection chutes 1016 are aligned with each filter disk 1004 and extend through the bottom of 12 the housing 1002 to a removal path 1017. Two sets of shower bars 1018, 1019 are disposed 13 above the filter disc 1004 to spray on to the disks and remove the fibre.
One set, 1018 is used to 14 remove product from the sector and the other set, 1018 is used to clean any remaining product.
[0027] In operation, a volume of slurry 1020, for example a slurry of water and wood or 16 paper fibres, is directed into the housing 1002. As can be seen in Figures 1 and 2, the collection 17 chutes 1016 extend well above the level ~of the slurry 1020. Suction is applied to the central 18 conduit 1006 and as the filter discs 1004'rotate through the slurry 1020, the suction draws the 19 slurry towards the submerged filter sectors 1008. This causes a layer of material, in this case fibres, to accumulate on the filter membrane 1012 as the water is drawn through the filter 21 membrane 1012, in the filter sector 1008 and through the fluid passage 1010 into the central 22 conduit 1006.
23 [0028] As the filter discs 1004 continues to rotate, the filter sectors 1008 that were 24 submerged in the slurry 1020 emerge intb the atmosphere within the housing 1002, with the layer of fibres still adhered to the filter membrane 1012. The suction applied through the conduit 1006 26 draws liquid through the membrane 1012 to reduce the water content of the fibres as they rotate.
27 As a sector rotates, the suction is removed from the interior of that segment and when the filter 28 sectors 1008 rotate into alignment with the knock off shower 1018 and the collection chutes 29 1016, fluid spray from the shower 1018 assists in peeling the fibre layers away from the filter membranes 1012 and fall into the collection chutes 1016. The (now dewatered) fibres then fall 21420372.1 i, ..
1 by gravity down to the fibre removal path 1017, where the fibres are then conveyed by an 2 appropriate mechanism, such as a screw knot shown) to another location for further processing.
3 Continued rotation of the disc brings the', sector to the cleaning shower 1019 which removes any 4 remaining fibres from the filter membral~e 1012.
7 [0029] As best seen in figure 3, each of the filter sectors 1008 has a body 10 with an inner 8 end or root 12 located adjacent to the colriduit 1006 and a radially outer tip 11. The body 10 has 9 oppositely directed front and rear faces 14, 15 that converge from the root 12 to the tip 11 and a pair of side faces 24 that interconnect thd front and rear faces 14, 15.
11 [0030] The faces 14, 15, 24 define a hollow interior 19 and radial ribs 16 extend between the 12 front and rear faces 14, 15 to provide additional support. The ribs 16 and side faces 24 are 13 interconnected by lateral supports 18 to define and open core for the body 10. The lateral 14 supports 18 are offset from one another can the faces 14, 15 to rrlinimise impediment to follow within the interior 19. The root 12 is provided with a gusset 20 to enhance the structural rigidity 16 of the inner end. A flange 22 extends from the gusset 20 to provide a mechanical connection to 17 the central conduit 1006.
18 [0031] The side faces 24 and ribs 16 are formed from a pair of overlapping angle pieces 30, 19 32 each having a pair of flanges 34, 36. The flanges 36 overlap one another in an axial plane with the overlap increasing from the rood 12 to the tip 11 to define tapered channels extending 21 from the tip to the root. The angle pieces 30, 32 are typically made of stainless steel and are spot 22 welded to one another at spaced intervals along their length. The angle pieces thus provide 23 tapering open channels extending from the tip 11 to the root 12.
24 [0032] The lateral supports 18 are also made of L-shaped stock oriented to have one flange 21 lying in the plane of front or rear face 14, 15 and the other 23 projecting axially into the 26 interior. The convergence of the faces 14, 15 causes the flange 23 to be downwardly and 27 inwardly inclined to promote the flow ofwater into the cavity 19. At the intersection of the ribs 28 16 and lateral supports 18, the flange 23 bf the stock is folded flat through a piercing and coining 29 operation so that a generally planar suppprt grid is formed on each face 14, 15 to support the membrane 1012. The membrane 1012 extends to the gusset 20 which is dimensioned to extend 21420372.1 1 radially beyond the collection chute 1016. This permits the membrane 1012 to be terminated at a 2 position to avoid contact with the chute.
3 [0033] The tips 11 of the sectors 1008 are connected to one another by a hoop structure 4 formed from interconnected decal strips '100 as best seen in figures 8, 9, and 10. Bach of the decal strips 100 is formed from a channel member 102 dimensioned to fit over the tip 11 of the 6 sectors 1008. The channel member 102 is cranked at its mid point, as indicated at 104, to 7 conform to the transition between adjacent sectors 1008. A slot 106 is formed in the channel 8 member 102 at one end and a connector 108 extends from the opposite end. The connector 108 9 is a channel member sized to fit over the channel member 102 and has a transverse hole 110 extending through the side walls. The hole 110 is positioned to align with the slot 106 of an 11 adjacent decal snip 102 to allow the members to be connected into a hoop.
In some 12 embodiment, the tips of the sectors 1008' are curved with a uniform radius, in which case the 13 decal strips 100 are not cranked but are c~f complementary uniformly curved formation to bridge 14 adjacent sectors.
[0034] When assembled on the filter wheel, each decal strip 100 is placed over the tips of a 16 pair of adjacent sectors so as to bridge the sectors. The decal strips are connected end to end 17 around the periphery of the wheel by a bolt 112 that passes through the slot 106 and hole 108.
18 The bolt 112 also passes through a hole 113 in the tip 11 and is secured by a nut 114 that is 19 preferably a single use aircraft nut that is suitable for use in corrosive environments. With the decal strips 100 secured, an outer hoop i$ provided that mechanically connects the sectors 1008 21 and inhibits relative movement.
22 [0035] In the operation, as the filter disc rotates the bending stresses imposed on individual 23 sectors is distributed through the decal strips into the adjacent sectors.
The converging faces 14, 24 15 also assist in preventing water from pissing back through the membrane as it moves towards the vacuum conduit 1006. The channel formed by the overlapping angle members in the sides 26 and ribs in directing water to the outlet v~iithout contacting the membrane and the lateral supports 27 18 similarly provide an open structure that does not impede the flow of water with the vane.
21420372.1 i, 2 [0036] As noted above, a disk filter includes a housing and a plurality of showers 1018, 1019 3 for assisting in the peeling of accumulated material away from the filter membrane of a filter 4 disk so that the material falls into a collection chute and for cleaning the fabric to begin another cycle. Now referring to Figure 11, the housing 200 comprises a main housing body 202 and an 6 access door 204.
7 (0037] Each of the showers 1018, 1019 includes a plurality of shower units 206 connected at 8 spaced intervals to a header 208 extendirng along the exterior of the housing 202. Each of the 9 shower units 206 is similar in construction and therefore only one will be described in detail.
[0038] Each of the shower unit 206 teas a U-shaped stand pipe 210 including a shut off valve 11 212. A quick connect coupling 214 is disposed a the end of the stand pipe for connection to a 12 shower bar 216. The coupling 214 may be of any convenient known construction such as a cap 13 and groove or a ball and groove connectpr.
14 [0039] The shower bar 216 projects through an aperture 218 provided in the door 204. In the case of the shower 1018, the shower bar '216 terminates in a nozzle 218 positioned adjacent one 16 of the filter disks to assist in peeling awaly the fibre mat. In the case of the shower 1019, the 17 shower bar has a plurality of nozzles 218 disposed along its length and projeting in opposite 18 directions onto adjacent filter disks.
19 [0040] If a nozzle 218 becomes blocked and requires routine maintenance, the shut off valve 212 may be closed to isolate the shower bar 216 which may then be released from the coupling 21 214. The shower bar may then be pulled from the housing 202 through the aperture and 22 appropriate repairs or maintenance perfo~ned. During this time, the filter disk may continue to 23 rotate and thereby avoid costly shut down of the production line. In order to replace the shower 24 bar 216 it is simply necessary to insert it through the aperture and again engage the quick release coupling 214. The supply can then be reconnected with the valve 212.
26 [0041] A further embodiment is shown in Figures 14 through 16 in which like reference 27 numerals will be used with a suffix 'a' far clarity. In the particular embodiment shown in 28 Figures 14 to 16, the shower bars 210a axe connected to the main shower header 208a so as to be 29 pivotable relative thereto. As can best b~ seen in Figure 14, at each location on the main shower header 208a where a shower bar 210a is !to be attached, a stand pipe 210a protrudes from the 21420372.1 _7_ i, ~.
1 main shower header 208 and terminates ~t a 90° elbow 220. A
compression tee 222 or similar 2 mechanical disconnect device is secured I,to the elbow 220 by way of a nut 224, which 3 arrangement permits the compression tee 222 to pivot relative to the elbow 220. A handle 226 is 4 secured in one opening in the compressi4n tee 222, and a shower bar 210a having a plurality of nozzles 218a is secured in the other branich of the compression tee 222. The elbow 220 includes 6 a shut off valve (not shown) to isolate eaich shower bar, and the nut 224 can be loosened to allow 7 the shower bar 210a to be pivoted, and tiightened to secure the shower bar 210a in the desired 8 position.
9 [0042] The door 204 can be opened end closed when the shower bars 21 Oa are in the first position as shown in Figure 15. When the door 204 is open, the shower bar 210a can be pivoted 11 from the first position shown in Figure 15 to the second position shown in Figure 16. As can be 12 seen clearly in Figure 16, the door 204 c~.n be closed when the shower bars 210a are in the 13 second position inside the housing 200. Thus, the housing 200 can be substantially closed when 14 any shower bar 210a is in either the first position or the second position.
The door 204 includes cut outs 226 to accommodate the connedtions between the shower bars 210a and the externally 16 mounted main shower header 208. Despite these recesses 226, the housing remains substantially 17 closed in the sense that the filtration process can continue.
18 [0043] When a disk filter is in operation, all of the shower bars 210a will ordinarily be in the 19 first position, that is, disposed substantially within the housing 200, and the disk filter will operate as described above. When the npzzles of one or more of the shower bars 210 become 21 obstructed, the disk filter does not have to be stopped. The relevant door or doors 204 can be 22 opened and the affected shower bar or b~.rs 210 can be moved into their second position outside 23 of the housing 200. The door or doors 204 are then closed. The affected shower bar or bars 210 24 are then isolated using the shut off valve in the elbow 220. The remaining shower bars 210 will continue to function while the affected shower bars 210 are cleaned or replaced. The clogging 26 of any shower bar will thus require no interruption to move that shower bar into its second 27 position outside the housing, where it cats be cleaned without affecting operation of the other 28 shower bars.
29 [0044] The pivotal arrangement of t)~e shower system described above is exemplary only, as there are many arrangements by which tie shower bars can be connected in fluid communication 21420372.1 _g_ 1 with the main shower header so as to be provable between a first position wherein the respective 2 shower bar is disposed substantially within the housing, and a second position in which the 3 shower bar is disposed outside the housing.
4 [0045] Although the invention has been described with reference to certain specific embodiments, various modifications thereof will be apparent to those skilled in the art without 6 departing from the spirit and scope of the invention as outlined in the claims appended hereto.
21420372.1
Claims
OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A filter sector for a disc filter, said sector having a root and a tip with a plurality of radial supports extending them between, each of said supports having a channel section with opposed walls diverging from said tip to said root, said radial supports being interconnected by lateral members to define a pair of oppositely directed faces to support a filter membrane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002510282A CA2510282A1 (en) | 2005-06-20 | 2005-06-20 | Filter sector, decal strip and shower system for disk filters |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002510282A CA2510282A1 (en) | 2005-06-20 | 2005-06-20 | Filter sector, decal strip and shower system for disk filters |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2510282A1 true CA2510282A1 (en) | 2006-12-20 |
Family
ID=39343559
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002510282A Abandoned CA2510282A1 (en) | 2005-06-20 | 2005-06-20 | Filter sector, decal strip and shower system for disk filters |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2510282A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109847438A (en) * | 2019-02-20 | 2019-06-07 | 洛阳矿山机械工程设计研究院有限责任公司 | A kind of fixed device in the conical surface plug-in type unilateral side of disk filter filter plate |
| CN110756054A (en) * | 2019-10-31 | 2020-02-07 | 天津城建大学 | Blade type hollow fiber membrane component and impeller type membrane component thereof |
| CN114849339A (en) * | 2022-05-18 | 2022-08-05 | 马鞍山格林环保科技有限公司 | Disc type vacuum filter with automatic liquid drainage system |
-
2005
- 2005-06-20 CA CA002510282A patent/CA2510282A1/en not_active Abandoned
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109847438A (en) * | 2019-02-20 | 2019-06-07 | 洛阳矿山机械工程设计研究院有限责任公司 | A kind of fixed device in the conical surface plug-in type unilateral side of disk filter filter plate |
| CN109847438B (en) * | 2019-02-20 | 2023-12-12 | 洛阳矿山机械工程设计研究院有限责任公司 | Conical surface inserted single-side fixing device of disc filter plate |
| CN110756054A (en) * | 2019-10-31 | 2020-02-07 | 天津城建大学 | Blade type hollow fiber membrane component and impeller type membrane component thereof |
| CN110756054B (en) * | 2019-10-31 | 2022-04-15 | 天津城建大学 | Blade type hollow fiber membrane component and impeller type membrane component thereof |
| CN114849339A (en) * | 2022-05-18 | 2022-08-05 | 马鞍山格林环保科技有限公司 | Disc type vacuum filter with automatic liquid drainage system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2051616C (en) | Nozzle for spray tubes | |
| KR100663191B1 (en) | Filter media cleaner for filter press | |
| CA1290705C (en) | Apparatus for separating dirt-particles from cooling water in power-plants | |
| WO2008067462A3 (en) | Filter apparatus with pulse cleaning and methods for pulse cleaning filters | |
| CA2510282A1 (en) | Filter sector, decal strip and shower system for disk filters | |
| JP2001097553A (en) | Pipe conduit connection for transferring rod-like article of tobacco industry by means of air pressure | |
| JP3499245B2 (en) | Strainer device to filter water to emergency cooling system of nuclear power plant | |
| JP2002536219A (en) | Apparatus for filtering thermoplastic synthetic resin materials | |
| US6368418B1 (en) | Pipeline cleaning tool and a method of cleaning pipelines | |
| CN115094674A (en) | Double-layer-structure filter paper for liquid filtration and preparation method thereof | |
| WO1998011972A1 (en) | A device in a filter sector for a rotating filter disc | |
| US5909847A (en) | Flushing cleaner for multiple shower wand assemblies | |
| CN112387263A (en) | Granular activated carbon washing equipment for sanitary towel | |
| WO1992022703A1 (en) | Washer | |
| JP2011140010A (en) | Strainer and strainer facility | |
| SU423312A3 (en) | DEVICE FOR SORTING FIBER SUSPENSIONS | |
| JPH05137912A (en) | Fixed screen filter | |
| WO2000072689A1 (en) | Washing apparatus for fish products | |
| CN206935139U (en) | It is efficiently positive to rinse filtration equipment for clarifying | |
| CN209866751U (en) | Automatic cleaning system of cotton collecting machine | |
| CN203170092U (en) | Filter device | |
| FI76851C (en) | FOERFARANDE OCH ANORDNING FOER RENHAOLLNING AV SIL- ELLER SIKTYTA. | |
| CN210794872U (en) | GRC panel production is with quantitative feeding device | |
| KR970000577Y1 (en) | Watering arrangement | |
| CN212384219U (en) | Municipal drainage sewage pipes |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |