SE506744C2 - Filter unit for rotating disk filter and method for its manufacture - Google Patents

Filter unit for rotating disk filter and method for its manufacture

Info

Publication number
SE506744C2
SE506744C2 SE9601105A SE9601105A SE506744C2 SE 506744 C2 SE506744 C2 SE 506744C2 SE 9601105 A SE9601105 A SE 9601105A SE 9601105 A SE9601105 A SE 9601105A SE 506744 C2 SE506744 C2 SE 506744C2
Authority
SE
Sweden
Prior art keywords
fastening strip
filter cloth
frame
side portions
filter
Prior art date
Application number
SE9601105A
Other languages
Swedish (sv)
Other versions
SE9601105D0 (en
SE9601105L (en
Inventor
Paul Cameron
Original Assignee
Alfa Laval Ab
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Alfa Laval Ab filed Critical Alfa Laval Ab
Priority to SE9601105A priority Critical patent/SE506744C2/en
Publication of SE9601105D0 publication Critical patent/SE9601105D0/en
Priority to PCT/SE1997/000391 priority patent/WO1997035656A1/en
Priority to IDP970924A priority patent/ID16381A/en
Publication of SE9601105L publication Critical patent/SE9601105L/en
Publication of SE506744C2 publication Critical patent/SE506744C2/en

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Classifications

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

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

Abstract

A filter unit (4) for use in a rotary disc filter comprises a frame (1), which defines a hole, and a filter cloth (3), which extends in the hole and which is connected to the frame. According to the invention an attachment strip (5) of a flexible stitchable material extends along the frame and is wrapped around latter, and the filter cloth is united with the attachment strip by means of at least one thread seam (6, 7).

Description

506 744 2 10 15 20 25 30 Ett ändamål med föreliggande uppfinning är att tillhanda- hålla en filterenhet som är väsentligen plan i färdigt skick och är hållbar vid användning för varma och korrosiva vätskeblandningar. Ett annat ändamål med uppfinningen är att tillhandahålla ett enkelt och snabbt förfarande för tillverkning av filterenheten. An object of the present invention is to provide a filter unit which is substantially flat in finished condition and is durable in use for hot and corrosive liquid mixtures. Another object of the invention is to provide a simple and fast method for manufacturing the filter unit.

Dessa ändamål uppnås medelst en filterenhet av det inledningsvis angivna slaget, som kännetecknas av att en fästremsa av ett flexibelt sybart material sträcker sig längs ramen och är vikt omkring denna, och att filterduken är förenad med fästremsan medelst minst en trådsöm. Således undviks svetsförband, som kan böja ramen, och limförband, som kan upplösas.These objects are achieved by means of a filter unit of the type indicated in the introduction, which is characterized in that a fastening strip of a flexible sewable material extends along the frame and is folded around it, and that the filter cloth is connected to the fastening strip by at least one thread stitch. This avoids welded joints that can bend the frame and adhesive joints that can dissolve.

Filterenheten framställs företrädesvis genom att ramen formas så att den avgränsar ett hål i vilket filterduken anbringas. Fästremsan viks sedan omkring ramen och sys fast i filterduken.The filter unit is preferably manufactured by shaping the frame so that it delimits a hole in which the filter cloth is applied. The fastening strip is then folded around the frame and sewn onto the filter cloth.

Enligt en föredragen utföringsform av filterenheten enligt uppfinningen är fästremsan vikt omkring ramen så att två motstående sidopartier av fästremsan sträcker sig ett stycke från ramen i hålet, och är filterduken förenad med fästremsans sidopartier medelst trådsömmen. T.ex. kan fästremsans sidopartier och filterduken anordnas kant mot kant mot varandra och trådsömmen bilda en sicksacklinje som växelvis korsar nämnda kanter.According to a preferred embodiment of the filter unit according to the invention, the fastening strip is folded around the frame so that two opposite side portions of the fastening strip extend a distance from the frame in the hole, and the filter cloth is joined to the side portions of the fastening strip by the wire seam. For example. the side portions of the fastening strip and the filter cloth can be arranged edge to edge against each other and the thread seam forming a zigzag line which alternately crosses said edges.

Lämpligen överlappas ett randområde hos filterduken av fästremsans motstående sidopartier, varvid trådsömmen förenar nämnda randomràde med fästremsans sidopartier, vilket medför en enklare tillverkning av filterenheten. 10 15 20 25 30 35 3 506 744 Fästremsans två motstàende sidopartier har tvà kanter som kan placeras mitt för varandra pà filterduken, vilket medger att trådsömmen kan bilda en sicksacklinje som växelvis korsar nämnda två kanter. Härigenom kan sido- partiernas kanter hos fästremsan hållas tryckta mot filterduken så att partiklar ej tränger in mellan filter- duken och fästremsan.Suitably, an edge area of the filter cloth is overlapped by the opposite side portions of the fastening strip, the thread seam joining said edge area with the side portions of the fastening strip, which results in a simpler manufacture of the filter unit. 10 15 20 25 30 35 3 506 744 The two opposite side portions of the fastening strip have two edges which can be placed opposite each other on the filter cloth, which allows the thread seam to form a zigzag line which alternately crosses said two edges. As a result, the edges of the side portions of the fastening strip can be kept pressed against the filter cloth so that particles do not penetrate between the filter cloth and the fastening strip.

Med fördel sys fästremsans motstående sidopartier fast i filterdukens randomràde genom att en första trådsöm sys längs ramen t.ex. i form av en sicksacklinje som växelvis korsar de två kanterna hos fästremsans sidopartier, var- efter en andra trådsöm sys längs ramen mellan denna och den första trádsömmen, varigenom filterduken sträcks. Härigenom kan även icke-krympbara filterdukar, t.ex. av syrafast stàl, sträckas. Alternativt eller som komplement kan fäst- remsan väljas av ett av värmepåverkan krympbart material, t.ex. vilket medför att när fästremsan och filterduken har sytts ihop kan fästremsan krympas genom värmepåverkan så att filterduken sträcks.Advantageously, the opposite side portions of the fastening strip are sewn into the edge area of the filter cloth by sewing a first thread seam along the frame, e.g. in the form of a zigzag line which alternately crosses the two edges of the side portions of the fastening strip, after which a second thread stitch is sewn along the frame between this and the first thread stitch, whereby the filter cloth is stretched. In this way, non-shrinkable filter cloths, e.g. of acid-proof steel, stretched. Alternatively or as a complement, the fastening strip can be selected from a material that can be shrunk by heat, e.g. which means that when the fastening strip and the filter cloth have been sewn together, the fastening strip can be shrunk by the action of heat so that the filter cloth is stretched.

Uppfinningen beskrivs närmare i det följande med hänvisning till den bifogade ritningen, pà vilken figur l visar delar av en filterenhet enligt uppfinningen, figur 2 visar en komplett filterenhet enligt uppfinningen, figur 3 visar ett snitt längs linjen III-III i figur 2, figur 4 visar en variant av utföringsformen enligt figur 3, och figur 5 visar en fästremsa för filterenheten enligt uppfinningen i utbrett skick.The invention is described in more detail in the following with reference to the accompanying drawing, in which figure 1 shows parts of a filter unit according to the invention, figure 2 shows a complete filter unit according to the invention, figure 3 shows a section along the line III-III in figure 2, figure 4 shows a variant of the embodiment according to figure 3, and figure 5 shows a fastening strip for the filter unit according to the invention in widespread condition.

I figur l visas delar av en filterenhet enligt upp- finningen, innefattande en ram l, som avgränsar ett hàl 2 och som har formen av en cirkelsektor med avskuren spets, och en filterduk 3, som är placerad i ramens 1 hål 2.Figure 1 shows parts of a filter unit according to the invention, comprising a frame 1, which delimits a hole 2 and which has the shape of a circular sector with a cut-off tip, and a filter cloth 3, which is placed in the hole 2 of the frame 1.

Filterduken 3 är tillskuren efter ramens l form men är 506 744 4 10 15 20 25 30 35 något mindre än hålet 2. Ramen 1 är av ett metalliskt material, företrädesvis syrafast stål. Filterduken är i detta fall av syrafast stål men kan även vara av ett krympbart plastmaterial, t.ex. polypropylen, I figur 2 visas en komplett filterenhet 4 enligt upp- finningen innefattande en fästremsa 5 av ett av värme- pàverkan krympbart filtmaterial, företrädesvis en polymer, t.ex. polypropylen, som är vikt omkring ramen 1 och förenad med filterduken 3 medelst två trådsömmar 6, 7, vilka sträcker sig på avstånd från varandra längs filterdukens 3 omkrets. Fästremsan 5 är försedd med urtagningar 8 (se Fig. 5) för att passa vid ramens 1 hörn. De motstáende korta ändkanterna 9, 10 hos fästremsan 5 är ihopsydda kant mot kant medelst en tràdsöm 11. Två motstáende sidopartier 12, 13 av fästremsan 5 sträcker sig ett stycke från ramen 1 i hålet 2 och överlappar ett randomràde 14 hos filterduken V3, varvid sidopartiernas 12, 13 kanter 15, 16 är belägna mitt för varandra på ömse sidor om filterduken (se Fig. 3).The filter cloth 3 is cut to the shape of the frame 1 but is slightly smaller than the hole 2. The frame 1 is of a metallic material, preferably acid-resistant steel. The filter cloth in this case is made of acid-resistant steel but can also be made of a shrinkable plastic material, e.g. polypropylene, Figure 2 shows a complete filter unit 4 according to the invention comprising a fastening strip 5 of a heat-shrinkable felt material, preferably a polymer, e.g. polypropylene, which is folded around the frame 1 and connected to the filter cloth 3 by means of two thread seams 6, 7, which extend at a distance from each other along the circumference of the filter cloth 3. The fastening strip 5 is provided with recesses 8 (see Fig. 5) to fit at the corner of the frame 1. The opposite short end edges 9, 10 of the fastening strip 5 are sewn together edge to edge by means of a thread seam 11. Two opposite side portions 12, 13 of the fastening strip 5 extend a distance from the frame 1 in the hole 2 and overlap an edge area 14 of the filter cloth V3. 12, 13 edges 15, 16 are located opposite each other on either side of the filter cloth (see Fig. 3).

Den från ramen 1 sett bortre trådsömmen 6 bildar en sick- sacklinje som växelvis korsar kanterna 15, 16, medan den andra trådsömmen 7 är en raksöm som löper parallellt med ramen 1. Alternativt kan fästremsan 5 bildas av fyra separata delremsor, som sys ihop med sina kanter mot varandra medelst fyra trådsömmar 11.The remote thread stitch 6 seen from the frame 1 forms a zigzag line which alternately crosses the edges 15, 16, while the second thread stitch 7 is a straight seam which runs parallel to the frame 1. Alternatively, the fastening strip 5 can be formed by four separate sub-strips, which are sewn together with their edges against each other by means of four thread stitches 11.

Figur 4 visar en variant av filterenheten i vilken filterduken 3' har dimensionerats med yttermått som överensstämmer med ramens 1 yttermått. I detta fall anligger filterduken 3' mot ramens 1 ena sida.Figure 4 shows a variant of the filter unit in which the filter cloth 3 'has been dimensioned with outer dimensions which correspond to the outer dimensions of the frame 1. In this case, the filter cloth 3 'abuts against one side of the frame 1.

Filterenheten 4 enligt Fig. 2 framställs på följande sätt.The filter unit 4 according to Fig. 2 is manufactured in the following manner.

Ramen 1 placeras på ett horisontellt underlag och den i förväg tillskurna filterduken 3 anbringas i ramens 1 hål 2.The frame 1 is placed on a horizontal base and the pre-cut filter cloth 3 is applied in the hole 2 of the frame 1.

Filterduken 3 förbinds provisoriskt till ramen 1 medelst 10 15 20 25 5 506 744 några få punktformiga limförband mellan filterdukens 3 omkretskant och ramens l innerkant. Fästremsan 5, vars ändkanter 9, 10 har förbundits kant mot kant med varandra medelst tràdsömmen 11, dras på ramen 1 så att fästremsans 5 sidopartier 12, 13 överlappar randområdet 14 hos filter- duken 3. Sicksacksömmen 6 sys längs filterdukens 3 hela omkrets och därefter sys raksömmen 7 likaledes längs filterdukens hela omkrets, vilket medför att filterduken 3 sträcks något. Slutligen krymps fästremsan 5 medelst värme- påverkan, varigenom filterduken 3 sträcks ytterligare.The filter cloth 3 is provisionally connected to the frame 1 by means of a few point-shaped adhesive connections between the circumferential edge of the filter cloth 3 and the inner edge of the frame. The fastening strip 5, the end edges 9, 10 of which are connected edge to edge with each other by means of the wire seam 11, is pulled on the frame 1 so that the side portions 12, 13 of the fastening strip 5 overlap the edge area 14 of the filter cloth 3. The zigzag seam 6 is sewn along the straight seam 7 is also sewn along the entire circumference of the filter cloth, which means that the filter cloth 3 is stretched slightly. Finally, the fastening strip 5 is shrunk by means of a heat effect, whereby the filter cloth 3 is further stretched.

Det är möjligt att slopa raksömmen 7 om erforderlig sträckning av filterduken utan raksömmen 7 uppnås genom krympningen av fästremsan 5. Alternativt behöver inte fästremsan 5 vara av ett krympbart material om erforderlig sträckning av filterduken kan uppnås medelst raksömmen 7.It is possible to dispense the straight seam 7 if the required stretching of the filter cloth without the straight seam 7 is achieved by the shrinkage of the fastening strip 5. Alternatively, the fastening strip 5 need not be of a shrinkable material if the required stretching of the filter cloth can be achieved by the straight seam 7.

Filterenheten enligt Fig. 4 framställs på samma sätt som filterenheten 4 enligt Fig. 2, frånsett att filterduken 3' placeras på ramen l och förbinds provisoriskt till denna medelst några få punktformiga limförband mellan filterduken 3' och ramens 1 uppàtvända sida.The filter unit according to Fig. 4 is manufactured in the same way as the filter unit 4 according to Fig. 2, except that the filter cloth 3 'is placed on the frame 1 and is temporarily connected to it by means of a few point-shaped adhesive joints between the filter cloth 3' and the upturned side of the frame 1.

Ramen 1 kan givetvis utformas så att den avgränsar ett hål med en annan form än den visade, t.ex. en månghörning med fem eller flera hörn.The frame 1 can of course be designed so that it delimits a hole with a different shape than the one shown, e.g. a polygon with five or more corners.

Claims (14)

506 744 6 10 15 20 25 30 4 E I I]506 744 6 10 15 20 25 30 4 E I I] 1. Filterenhet (4) för användning i roterande skivfilter, innefattande en ram (1), som avgränsar ett hàl (2), och en enkel filterduk (3, 3'), som sträcker sig i hålet och som är ansluten till ramen, k ä n n e t e c k n a d a v att en fästremsa (5) av ett flexibelt sybart material sträcker sig längs ramen (1) och är vikt omkring denna, och att filterduken (3, 3') är förenad med fästremsan medelst minst en tràdsöm (6, 7).A filter unit (4) for use in a rotating disc filter, comprising a frame (1) defining a hole (2), and a simple filter cloth (3, 3 ') extending into the hole and connected to the frame, characterized in that a fastening strip (5) of a flexible sewable material extends along the frame (1) and is folded around it, and that the filter cloth (3, 3 ') is connected to the fastening strip by means of at least one thread seam (6, 7). 2. Filterenhet enligt krav 1, k ä n n e t e c k n a d a v att fästremsan (5) är vikt omkring ramen (1) så att två motstàende sidopartier (12, 13) av fästremsan sträcker sig ett stycke från ramen i hålet (2), och att filterduken (3, 3') är förenad med fästremsans sidopartier medelst nämnda trádsöm (6, 7).Filter unit according to claim 1, characterized in that the fastening strip (5) is folded around the frame (1) so that two opposite side portions (12, 13) of the fastening strip extend a distance from the frame in the hole (2), and that the filter cloth ( 3, 3 ') is connected to the side portions of the fastening strip by means of said thread seam (6, 7). 3. Filterenhet enligt krav 2, k ä n n e t e c k n a d a v att ett randomráde (14) hos filterduken (3, 3') överlappas av fästremsans (5) motstàende sidopartier (12, 13), varvid tràdsömmen (6, 7) förenar nämnda randomràde med nämnda sidopartier hos fästremsan.Filter unit according to claim 2, characterized in that a random row (14) of the filter cloth (3, 3 ') is overlapped by the opposite side portions (12, 13) of the fastening strip (5), the thread seam (6, 7) joining said edge area with said filter area. side portions of the fastening strip. 4. Filterenhet enligt krav 3, k ä n n e t e c k n a d a v att fästremsans (5) tvà motstàende sidopartier (12, 13) har tvà kanter (15, 16), vilka är belägna mitt för varandra pà filterduken (3, 3'), och att tràdsömmen (6) bildar en sicksacklinje som växelvis korsar de två kanterna hos fästremsans motstàende sidopartier.Filter unit according to claim 3, characterized in that the two opposite side portions (12, 13) of the fastening strip (5) have two edges (15, 16), which are located opposite each other on the filter cloth (3, 3 '), and that the thread seam (6) forms a zigzag line which alternately crosses the two edges of the opposite side portions of the fastening strip. 5. Filterenhet enligt krav 3 eller 4, k ä n n e t e c k - n a d a v att filterdukens randomràde (14) är förenad med fästremsans (5) sidopartier (12, 13) medelst tvà 10 15 20 25 30 7 506 744 trådsömmar (6, 7), vilka är anordnade på avstånd från varandra och sträcker sig längs ramen (1).Filter unit according to Claim 3 or 4, characterized in that the edge area (14) of the filter cloth is connected to the side portions (12, 13) of the fastening strip (5) by means of two wire seams (6, 7), which are spaced apart and extend along the frame (1). 6. Filterenhet enligt något av kraven 3-5, k ä n n e - att filterdukens (3, 3') randområde (14) är beläget mellan fästremsans (5) motstående sido- t e c k n a d a v partier (12, 13).Filter unit according to one of Claims 3 to 5, characterized in that the edge region (14) of the filter cloth (3, 3 ') is located between the opposite side strips (12, 13) of the fastening strip (5). 7. Filterenhet enligt något av kraven l-6, k ä n n e - t e c k n a d a v att fästremsan (5) består av ett filtmaterial.Filter unit according to one of Claims 1 to 6, characterized in that the fastening strip (5) consists of a felt material. 8. Filterenhet enligt något av kraven 1-7, k ä n n e - t e c k n a d a v att fästremsan (5) består av ett material som krymper under påverkan av värme.Filter unit according to one of Claims 1 to 7, characterized in that the fastening strip (5) consists of a material which shrinks under the influence of heat. 9. Förfarande för framställning av en filterenhet (4) för användning i roterande skivfilter, vilket förfarande innefattar formning av en ram (1) så att den avgränsar ett hål (2), och anbringande av en filterduk (3, 3') i hålet, k ä n n e t e c k n a t a v att en fästremsa (5) av ett flexibelt sybart material viks omkring ramen (1) och sys fast i filterduken (3, 3').A method of manufacturing a filter unit (4) for use in rotary disc filters, the method comprising forming a frame (1) so as to define a hole (2), and applying a filter cloth (3, 3 ') to the hole , characterized in that a fastening strip (5) of a flexible sewable material is folded around the frame (1) and sewn to the filter cloth (3, 3 '). 10. Förfarande enligt krav 9, k ä n n e t e c k n a t a v att fästremsan (5) viks omkring ramen (1) så att två motstående sidopartier (12, 13) av fästremsan sträcker sig ett stycke från ramen i hålet (2), och att fästremsans sidopartier sys fast i filterduken (3, 3').Method according to claim 9, characterized in that the fastening strip (5) is folded around the frame (1) so that two opposite side portions (12, 13) of the fastening strip extend a distance from the frame in the hole (2), and that the side portions of the fastening strip are sewn fixed to the filter cloth (3, 3 '). 11. ll. Förfarande enligt krav 10, k ä n n e t e c k n a t a v att fästremsans (5) motstående sidopartier (12, 13) placeras över ett randområde (14) hos filterduken (3, 3') och sys fast i detta. 506 744 a 10 1511. ll. Method according to claim 10, characterized in that the opposite side portions (12, 13) of the fastening strip (5) are placed over an edge area (14) of the filter cloth (3, 3 ') and sewn into this. 506 744 a 10 15 12. Förfarande enligt krav 11, k ä n n e t e c k n a t a V att fästremsans (5) motstående sidopartier (12, 13) sys fast i filterdukens randområde (14) genom att en första tràdsöm (6) först sys längs ramen (1), varefter en andra tràdsöm (7) sys längs ramen mellan denna och den första tràdsömmen, varigenom filterduken sträcks.Method according to claim 11, characterized in that the opposite side portions (12, 13) of the fastening strip (5) are sewn into the edge area (14) of the filter cloth by first sewing a first thread seam (6) along the frame (1), after which a second thread stitch (7) is sewn along the frame between this and the first thread stitch, whereby the filter cloth is stretched. 13. Förfarande enligt krav 12, k ä n n e t e c k n a t a v att fästremsans (5) tvà motstàende sidopartier (12, 13) har två kanter (15, 16), vilka placeras mitt för varandra pà filterduken (3, 3'), och att nämnda första tràdsöm (6) sys i form av en sicksacklinje som växelvis korsar nämnda tvà kanter hos fästremsans sidopartier.Method according to claim 12, characterized in that the two opposite side portions (12, 13) of the fastening strip (5) have two edges (15, 16), which are placed opposite each other on the filter cloth (3, 3 '), and that said first thread stitch (6) is sewn in the form of a zigzag line which alternately crosses said two edges of the side portions of the fastening strip. 14. Förfarande enligt något av kraven 9-13, k ä n n e - t e c k n a t a v att fästremsan (5) består av ett av värmepàverkan krympbart material, och att när fästremsan och filterduken (3, 3') har sytts ihop krympes fästremsan medelst värmepàverkan, varigenom filterduken sträcks.Method according to one of Claims 9 to 13, characterized in that the fastening strip (5) consists of a material which can be shrunk by heat action, and that when the fastening strip and the filter cloth (3, 3 ') have been sewn together, the fastening strip is shrunk by means of heat action, whereby the filter cloth is stretched.
SE9601105A 1996-03-22 1996-03-22 Filter unit for rotating disk filter and method for its manufacture SE506744C2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
SE9601105A SE506744C2 (en) 1996-03-22 1996-03-22 Filter unit for rotating disk filter and method for its manufacture
PCT/SE1997/000391 WO1997035656A1 (en) 1996-03-22 1997-03-07 Filter unit
IDP970924A ID16381A (en) 1996-03-22 1997-03-21 FILTER UNIT

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE9601105A SE506744C2 (en) 1996-03-22 1996-03-22 Filter unit for rotating disk filter and method for its manufacture

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SE9601105D0 SE9601105D0 (en) 1996-03-22
SE9601105L SE9601105L (en) 1997-09-23
SE506744C2 true SE506744C2 (en) 1998-02-09

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WO (1) WO1997035656A1 (en)

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SE9601105D0 (en) 1996-03-22
SE9601105L (en) 1997-09-23
ID16381A (en) 1997-09-25
WO1997035656A1 (en) 1997-10-02

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