DK148952B - FILTER ELEMENT FOR FLUIDA - Google Patents

FILTER ELEMENT FOR FLUIDA Download PDF

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Publication number
DK148952B
DK148952B DK149577A DK149577A DK148952B DK 148952 B DK148952 B DK 148952B DK 149577 A DK149577 A DK 149577A DK 149577 A DK149577 A DK 149577A DK 148952 B DK148952 B DK 148952B
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DK
Denmark
Prior art keywords
filter
filter element
pleated
fibers
sheet
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Application number
DK149577A
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Danish (da)
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DK149577A (en
DK148952C (en
Inventor
George Sherwood Hunter
Susanne Phyllis Hunter
Brian Walker
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Process Scient Innovations
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Priority claimed from GB13640/76A external-priority patent/GB1557821A/en
Application filed by Process Scient Innovations filed Critical Process Scient Innovations
Publication of DK149577A publication Critical patent/DK149577A/en
Publication of DK148952B publication Critical patent/DK148952B/en
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Publication of DK148952C publication Critical patent/DK148952C/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/52—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material
    • B01D46/521—Particle separators, e.g. dust precipitators, using filters embodying folded corrugated or wound sheet material using folded, pleated material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D27/00—Cartridge filters of the throw-away type
    • B01D27/04—Cartridge filters of the throw-away type with cartridges made of a piece of unitary material, e.g. filter paper
    • B01D27/06—Cartridge filters of the throw-away type with cartridges made of a piece of unitary material, e.g. filter paper with corrugated, folded or wound material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
    • B01D35/14—Safety devices specially adapted for filtration; Devices for indicating clogging
    • B01D35/143—Filter condition indicators
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/02—Loose filtering material, e.g. loose fibres
    • B01D39/04—Organic material, e.g. cellulose, cotton
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
    • B01D39/2003—Glass or glassy material
    • B01D39/2017—Glass or glassy material the material being filamentary or fibrous
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
    • B01D39/2003—Glass or glassy material
    • B01D39/2017—Glass or glassy material the material being filamentary or fibrous
    • B01D39/2024—Glass or glassy material the material being filamentary or fibrous otherwise bonded, e.g. by resins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
    • B01D39/2027—Metallic material
    • B01D39/2041—Metallic material the material being filamentary or fibrous
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
    • B01D39/2055—Carbonaceous material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
    • B01D39/2068—Other inorganic materials, e.g. ceramics
    • B01D39/2072—Other inorganic materials, e.g. ceramics the material being particulate or granular
    • B01D39/2079—Other inorganic materials, e.g. ceramics the material being particulate or granular otherwise bonded, e.g. by resins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
    • B01D39/2068—Other inorganic materials, e.g. ceramics
    • B01D39/2082—Other inorganic materials, e.g. ceramics the material being filamentary or fibrous
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/0084—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours provided with safety means
    • B01D46/0095—Means acting upon failure of the filtering system, e.g. in case of damage of the filter elements; Failsafes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
    • B01D2239/0604—Arrangement of the fibres in the filtering material
    • B01D2239/064—The fibres being mixed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
    • B01D2239/065—More than one layer present in the filtering material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/08—Special characteristics of binders
    • B01D2239/086—Binders between particles or fibres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/12—Special parameters characterising the filtering material
    • B01D2239/1208—Porosity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/12—Special parameters characterising the filtering material
    • B01D2239/1225—Fibre length
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/12—Special parameters characterising the filtering material
    • B01D2239/1233—Fibre diameter

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Filtering Materials (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
  • Filtration Of Liquid (AREA)

Description

i 148952in 148952

Opfindelsen vedrører et filterelement til fluida og omfattende dels mindst ét cylinderformet ark af uvævet, mikroporøst og fibrøst filtermateriale, som er imprægneret med et syntetisk harpiksbindemiddel, og som 5 er plisseret i det væsentlige parallelt med det cylinderformede arks længdeakse, dels mindst én perforeret støttecylinder af forholdsvis stift materiale forsynet med perforeringer over hovedsagelig hele sin. overflade og monteret stødende tæt op til det cylinderformede ark, 10 så den støtter dette, medens det syntetiske harpiksbindemiddel støtter det mikroporøse materiale i plisseringerne.The invention relates to a filter element for fluids comprising at least one cylindrical sheet of nonwoven, microporous and fibrous filter material impregnated with a synthetic resin binder which is spaced substantially parallel to the longitudinal axis of the cylindrical sheet and at least one perforated support roll. relatively rigid material provided with perforations over essentially its whole. surface and mounted adjacent close to the cylindrical sheet 10 to support it, while the synthetic resin binder supports the microporous material in the pleats.

Filterelementer af denne art kendes fra GB patentskrift nr. 1 265 089, GB patentskrift nr. 1 395 399 15 og GB patentskrift nr. 1 401 232.Filter elements of this kind are known from GB patent specification 1 265 089, GB patent specification 1 395 399 15 and GB patent specification 1 401 232.

Filterelementet ifølge opfindelsen adskiller sig fra de kendte ved, at filtermaterialet udgøres af en amorf masse af fibre af borsilikatglas, at en væsentlig mængde af disse fibre har en diameter på mellem 0,5 og 20 0,9 μιη og en længde på mellem 1 og 2 mm, medens de øvrige fibre er op til 6 mm lange, og at arket har en tykkelse på mindst 0,73 mm.The filter element according to the invention differs from the known in that the filter material is constituted by an amorphous mass of borosilicate glass fibers, that a substantial amount of these fibers have a diameter between 0.5 and 0.9 μιη and a length between 1 and 2 mm while the other fibers are up to 6 mm long and the sheet has a thickness of at least 0.73 mm.

Det har vist sig, at filterelementerne kan gøres usædvanligt effektive til fjernelse af forurenende sus-25 pensioner, såsom støv, smuds, olie- eller vanddråber eller damp fra en luftstrøm.It has been found that the filter elements can be made exceptionally effective for removing contaminant suspensions, such as dust, dirt, oil or water droplets or steam from an air stream.

Ifølge en foretrukket udføreIsesform er filterelementet ejendommeligt ved, at det uvævede mikroporøse og fibrøse filtermateriale er sammenholdt af et yderli-30 gere lag af uvævet filtermateriale bestående af keramiske fibre, metalfibre, asbest, mineraluld, andre glas-. fibre eller organiske fibre.According to a preferred embodiment, the filter element is characterized in that the nonwoven microporous and fibrous filter material is joined together by an additional layer of nonwoven filter material consisting of ceramic fibers, metal fibers, asbestos, mineral wool, other glass. fibers or organic fibers.

En yderligere foretrukket udførelsesform af filterelementet ifølge opfindelsen er ejendommelig ved, at 35 det plisserede ark af uvævet mikroporøst og fibrøst fil- 2 148952 termateriale er belagt med et lag af aktivt kul. Det opnås herved, at filterelementet på effektiv måde også fjerner lugt.A further preferred embodiment of the filter element according to the invention is characterized in that the pleated sheet of nonwoven microporous and fibrous film material is coated with a layer of activated carbon. It is thereby achieved that the filter element also effectively removes odor.

Opfindelsen forklares nærmere nedenfor under hen-5 visning til tegningen, hvor fig. 1 viser et lodret billede af et filterelement ifølge opfindelsen, fig. 2 et udsnit i større skala af det i fig. 1 viste filterelement, 10 fig· 3 skitsemæssigt et lodret billede af et filteraggregat med filterelementer ifølge opfindelsen, fig. 4 et lodret billede af et filterelement fra fig. 3 med en ydre cylinder af stift materiale vist delvis fjernet, 15 fig. 5 det i fig. 4 viste filterelement set fra enden, og fig. 6 i større målestok et udsnit af det filterelement, der er vist i fig. 4 og 5.The invention is explained in more detail below with reference to the drawing, in which fig. 1 is a vertical view of a filter element according to the invention; FIG. 2 is a larger scale view of the embodiment of FIG. 1 is a vertical view of a filter assembly with filter elements according to the invention; FIG. 4 is a vertical view of a filter element of FIG. 3 with an outer cylinder of rigid material shown partially removed, FIG. 5 shows the embodiment of FIG. 4 is an end view of the filter element, and FIG. 6 is an enlarged sectional view of the filter element shown in FIG. 4 and 5.

Det i fig. 1 og 2 viste filterelement er sammen-20 sat af to plisserede lag 1 af et lamineret filtermateriale bestående af glasfiber-filterpapir og på ydersiden afstivet af et plisseret lag 2 af ekspanderet metal, der passer nøjagtigt til glasfiberlagene. En indre simpel støttecylinder 3 af ekspanderet metal ligger an 25 imod filterlagene l's bølgetoppe.The FIG. 1 and 2 are composed of two pleated layers 1 of a laminated filter material consisting of fiberglass filter paper and stiffened on the outside by a pleated layer 2 of expanded metal that exactly matches the fiberglass layers. An inner, simple expanded metal support cylinder 3 abuts against the wave peaks of the filter layers 1.

Tykkelsen af filterlagene 1 kan svarende til antallet af lag ligge imellem 1 mm og 12,7 mm afhængigt af filterets størrelse. Fibrenes diameter kan variere imellem 0,1 og 20 μια afhængigt af den mindste partikel-30 størrelse, der skal separeres fra det pågældende fluidum.The thickness of the filter layers 1 may correspond to the number of layers between 1 mm and 12.7 mm depending on the size of the filter. The diameter of the fibers may vary between 0.1 and 20 μια depending on the smallest particle size to be separated from the fluid in question.

Det sammensatte filterelement er imprægneret og bundet med phenol-, silikone- eller andre syntetiske harpiksmaterialer, der kan modstå vand, mineralske, 35 vegetabilske og syntetiske olier, syrer, baser og 148952 3 sådanne urenhedsstoffer, der sædvanligvis forefindes i atmosfærisk luft, komprimeret luft, dampe og gasser.The composite filter element is impregnated and bonded with phenolic, silicone or other synthetic resin materials that can withstand water, mineral, vegetable and synthetic oils, acids, bases and such impurities usually present in atmospheric air, compressed air, vapors and gases.

Hvert filterlag 1 består af glasfiber-filterpa-pir, der er bundet til et uvævet filtermateriale ved 5 hjælp af et plastmateriale, såsom polyethylen eller polypropylen eller en anden passende syntetisk harpiks, der f.eks. ved tilsætning af et flydende, kemisk eller varmhærdnende middel kan være termohærdnende eller kold-hærdnende.Each filter layer 1 consists of fiberglass filter paper which is bonded to a nonwoven filter material by a plastic material such as polyethylene or polypropylene or another suitable synthetic resin, e.g. by the addition of a liquid, chemical or thermosetting agent may be thermosetting or cold-curing.

10 Det laminerede filtermateriale kan fremstilles ved først at sprøjte det uvævede filterpapir med et termoplastisk materiale. Det således behandlede papir bringes dernæst i berøring med glasfiberpapiret under udøvelse af et tryk og under varmetilførsel, således at 15 det termoplas tiske materiale smelter og danner en limning under hærdningen. Dernæst plisseres dette materiale og formes til én cylinder, men dette kan udføres efter tilføjelsen af et andet lag af et ikke-lamineret filterpapir, der ved hjælp af et termoplastisk materiale eller 20 et andet syntetisk harpiksmateriale dispergeret i et passende opløsningsmiddel er bundet til det laminerede filteremne, idet der således dannes to lag, hvor bindemidlet giver det fibrøse materiale nogen struktuel stivhed. Det plisserede papirlag anbringes dernæst i den 25 plisserede med huller forsynede plade 2 af ekspanderet metal. Det sammensatte plisserede element kan ligeledes understøttes ved dets indre bølgetoppe ved hjælp af en simpel cylinder af ekspanderet metal. Til slut lukkes enderne af dette element ved dypning, således som den 30 normale procedure er i forbindelse med plisserede filtre, til dannelse af endelukker af syntetisk harpiks eller et andet forseglende medium, der gennemtrænger filterelementets kantområder og forhindrer en lækage af det pågældende fluidum omkring disse kanter. Denne syn-35 tetiske harpiks kan med fordel være af den art, som kan 148952 4 formgives under anbringelse på filterelementet til dannelse af en ring eller en hætte, som har samme egenskaber som en pakning. Disse endehætter tilvejebringes naturligvis med det formål at sikre det pågældende flui-5 dums passage igennem filterelementet, når dette element er monteret i et filterhus.The laminated filter material can be made by first spraying the nonwoven filter paper with a thermoplastic material. The paper thus treated is then brought into contact with the fiberglass paper under pressure and under heat supply so that the thermoplastic material melts and forms an adhesive during curing. Next, this material is pleated and formed into one cylinder, but this can be accomplished after the addition of a second layer of a non-laminated filter paper dispersed by a thermoplastic or other synthetic resin material in a suitable solvent to the laminated filter blank, thus forming two layers where the binder gives the fibrous material some structural stiffness. The pleated paper layer is then placed into the 25 pleated expanded metal plate 2. The composite pleated member may also be supported at its inner waveguide by a simple expanded metal cylinder. Finally, the ends of this element are closed by dipping, as is the usual procedure for pleated filters, to form synthetic resin end caps or other sealing medium which permeate the edge regions of the filter element and prevent any leakage of the fluid concerned around them. edges. This synthetic resin may advantageously be of the kind that can be formed during application to the filter element to form a ring or cap having the same characteristics as a gasket. These end caps are of course provided for the purpose of ensuring the passage of the fluid in question through the filter element when this element is mounted in a filter housing.

Ved en ændret udførelsesform for det foran beskrevne filterelement, som gælder for mindre elementer med en diameter på f.eks. 50 mm og med en højde på 50 10 til 75 mm, erstattes den plisserede med huller forsynede plade 2 af ekspanderet metal af en glat cylinder af det samme materiale, hvilken cylinder blot berører det plisserede emnes ydre eller indre bølgetoppe. Alternativt kan der benyttes to sådanne glatte cylindre, der 15 berører henholdsvis de ydre og de indre bølgetoppe.In a modified embodiment of the aforementioned filter element, which applies to smaller elements having a diameter of e.g. 50 mm and at a height of 50 10 to 75 mm, the expanded metal-plated sheet 2 plate 2 is replaced by a smooth cylinder of the same material, the cylinder merely touching the outer or inner waveguide of the pleated workpiece. Alternatively, two such smooth cylinders may be used, touching the outer and inner wave peaks, respectively.

En fordel ved de foran beskrevne laminerede emner, hvori der indgår glasfiber-filterpapir, er, at dette papir giver emnerne en større egenstyrke i strømningsretningen igennem emnerne. Det betyder, at der til 20 styrkelse af filterpapiret kan bruges mindre mængder syntetisk plastmateriale, der således muliggør en kraftigere strøm af luft eller et andet fluidum, som skal filtreres i forbindelse med et mindre trykfald igennem filteret. Endvidere kan filterelementet indeholdende 25 sådanne laminerede emner modstå større chokagtige trykbelastninger og større trykfald igennem filteret, efterhånden som filteret under brugen bliver tilstoppet med partikelformet materiale.An advantage of the above-described laminated blanks, which includes fiberglass filter paper, is that this blend gives the blanks a greater flow in the direction of flow through the blanks. This means that for strengthening the filter paper smaller amounts of synthetic plastic material can be used, thus enabling a stronger flow of air or other fluid to be filtered in connection with a smaller pressure drop through the filter. Furthermore, the filter element containing 25 such laminated members can withstand greater shock-like pressure loads and larger pressure drops through the filter as the filter becomes clogged with particulate material during use.

Et eksempel på et filterelement indeholdende et 30 cylinderformet, plisseret, lamineret emne imellem glatte cylindre af ekspanderet metal har i hovedsagen følgende dimensioner: en yderdiameter på 4,4 cm, en længde på 6,0 cm, en afstand imellem de ydre bølgetoppe på 0,4 cm og en radial afstand imellem den indre og den ydre cylinder 35 på 0,6 cm.An example of a filter element containing a cylindrical, pleated, laminated blank between expanded cylinders of expanded metal has substantially the following dimensions: an outer diameter of 4.4 cm, a length of 6.0 cm, a distance between the outer wave peaks of 0 , 4 cm and a radial distance between the inner and outer cylinders 35 of 0.6 cm.

148952 5148952 5

Det i fig. 3 viste aggregat består af et tilgangsrør 11 for tilførsel af komprimeret luft til et primært filter 12 indeholdende et filterelement 13, der er udformet ifølge opfindelsen. Dette filter fjerner 5 eventuel olie eller vandtåge eller snavs fra luftstrømmen, der dernæst strømmer igennem et rør 14 til et sekundært filter 15 indeholdende et filterelement 16 af den i fig. 4-6 viste art. Efter at have passeret igennem filterelementet 16 udledes den rensede luft 10 igennem en rørledning 17.The FIG. 3 comprises an inlet pipe 11 for supplying compressed air to a primary filter 12 containing a filter element 13 formed according to the invention. This filter removes any oil or water mist or dirt from the flow of air, which then flows through a pipe 14 to a secondary filter 15 containing a filter element 16 of the embodiment shown in FIG. 4-6. After passing through the filter element 16, the purified air 10 is discharged through a pipeline 17.

Filterelementet 16 består af et plisseret laminat 18 af aktivt kul og et filterpapir båret imellem en indre og en ydre cylinder henholdsvis 19 og 20 af ekspanderet metal. Enderne af filterelementerne 13 og 15 16 er tætlukkede ved hjælp af endedæksler, af hvilke det øverste er forsynet med et hul i midten, således som det normalt er tilfældet i forbindelse med plisserede, cylinderformede filterelementer.The filter element 16 consists of a pleated activated carbon laminate 18 and a filter paper carried between an inner and an outer cylinder 19 and 20 of expanded metal, respectively. The ends of the filter elements 13 and 15 16 are closed by means of end caps, the top of which is provided with a hole in the middle, as is usually the case with pleated cylindrical filter elements.

Som vist i fig. 6 med en pil A strømmer den 20 luft, der skal renses, fra filterelementet 16's yderside til dettes indre, således at laget af aktivt kul 21 befinder sig på ydersiden af laget 22 af filterpapir. Såfremt strømmen havde den modsatte retning, ville aktivkullaget befinde sig på indersiden.As shown in FIG. 6 with an arrow A, the 20 air to be cleaned flows from the outside of the filter element 16 to the interior thereof, so that the layer of activated carbon 21 is on the outside of the layer 22 of filter paper. If the current had the opposite direction, the activated carbon layer would be on the inside.

25 Laget af aktivt kul kan have en tykkelse på ca.25 The layer of activated carbon can have a thickness of approx.

1 mm og et indhold af aktivt kul på 50 vægtprocent, idet resten udgøres af fibre. Aktivkullaget 21 fjerner f.eks. ved adsorption hydrocarbongas fra luften, og partikelformet materiale, der eventuelt afkastes fra aktiv-30 kullaget fjernes af det efterfølgende tilgrænsende filterlag, der er mindst 96% effektivt overfor 0,3 μπι store partikler.1 mm and an active carbon content of 50% by weight, the remainder being fibers. The active ball layer 21 removes e.g. by adsorption of hydrocarbon gas from the air, and particulate material which is possibly discharged from the activated carbon layer is removed by the subsequent adjoining filter layer, which is at least 96% effective against 0.3 μπι large particles.

Filterpapirlaget 22 kan som nævnt ovenfor være dannet af glasfiber-filterpapir lamineret til et uvævet 35 filtermateriale. I dette eksempel og i de andre ovenfor 6 148952 beskrevne eksempler kan det uvævede filtermateriale bestå af mikroporøse, uvævede borsilikat-glasfibre, der holdes sammen af et organisk bindemiddel, og hvor glasfibrene har en middeldiameter beliggende i intervallet 5 0,5-9,0 \m (inklusive) og en længde på mellem 1 og 2 mm (inklusive) samt omfatter grove fibre på op til 6 mm's længde, og hvor borsilikat-glasmaterialet yderligere er imprægneret med et syntetisk harpiksbindemiddel for at filterelementet kan modstå chokagtige trykbelastninger, 10 når det er monteret imellem to simple perforerede støttecylindre af metal. Det syntetiske harpiksbindemiddel er fortrinsvis silikone, men andre materialer såsom polyurethan, phenolharpiks eller epoxyharpiks kan anvendes.The filter paper layer 22 may, as mentioned above, be formed of fiberglass filter paper laminated to a nonwoven filter material. In this example and in the other examples described above, the nonwoven filter material may consist of microporous, nonwoven borosilicate glass fibers held together by an organic binder and the glass fibers having an average diameter in the range of 0.5 to 9.0. µm (inclusive) and a length of between 1 and 2 mm (inclusive) and comprising coarse fibers up to 6 mm in length, and wherein the borosilicate glass material is further impregnated with a synthetic resin binder so that the filter element can withstand shock-like compressive loads 10 when it is mounted between two simple perforated metal support cylinders. The synthetic resin binder is preferably silicone, but other materials such as polyurethane, phenolic resin or epoxy resin may be used.

15 Som et alternativ til ekspanderet metal kan det perforerede og plisserede støttelag være fremstillet af metalnet eller af et stift ikke-metallisk materiale og, som vist i fig. 2, anbragt med totalberøring på ydersiden af det eller de plisserede lag af filtermateriale. I 20 nogle tilfælde er det imidlertid nødvendigt, at filteret besidder en større mekanisk styrke i strømningens hovedretning end i den modsatte retning. Det vil sige, at støttelaget fortrinsvis er anbragt på indersiden, når det fluidum, der skal filtreres, passerer igennem fra 25 ydersiden af cylinderen til indersiden. I alternative arrangementer kan der imidlertid være tilføjet to eller tre lag filtermateriale til den korrugerede inderside eller yderside af den plisserede cylinder udover støttelaget .As an alternative to expanded metal, the perforated and pleated support layer may be made of metal mesh or of a rigid non-metallic material and, as shown in FIG. 2, provided with total contact on the outside of the pleated layer (s) of filter material. However, in some cases, it is necessary for the filter to have a greater mechanical strength in the main direction of the flow than in the opposite direction. That is, the support layer is preferably disposed on the inside as the fluid to be filtered passes through from the outside of the cylinder to the inside. However, in alternative arrangements, two or three layers of filter material may be added to the corrugated interior or exterior of the pleated cylinder in addition to the support layer.

30 Filterelementet omfattende det sammensatte plis serede filtermateriale og bærer er med stor fordel, og for yderligere at forlene det med en stor mekanisk styrke til forhindring af iturivning af det skrøbelige filtermateriale, når det udsættes for chokagtige trykbe-35 lastninger, forstærket med harpiks. Dette kan ske ved at 1489.52 7 tvinge en flydende bærer af en f.eks. phenol- eller silikoneharpiks ind i materialet, men kun til en sådan grad, at man i hovedsagen undgår at forringe materialets filteregenskaber. Den hertil nødvendige kraft kan 5 frembringes ved hjælp af en centrifuge eller ved hjælp af vakuum- eller komprimeringsteknik. Alternativt kan filterelementet simpelthen neddyppes et stykke tid i en harpiksopløsning. For at holde filtermaterialet på plads under denne proces, og når det skal fungere som filter, 10 kan der tilføjes en simpel cylinder af et perforeret støttemateriale på en sådan måde, at denne cylinder kun berører det plisserede filtermateriales bølgetoppe på den anden side af det plisserede filtermateriale. Bf ter imprægneringen sættes filteret ind i en ovn, for at har-15 piksen kan hærde ved den fornødne temperatur. Alternativt kan filtermaterialet forud for plisseringen blive imprægneret med en harpiks, der dernæst hærder ved en forhøjet temperatur.The filter element comprising the composite pleated filter material and carrier is of great advantage, and to further impart it with a great mechanical strength to prevent tearing of the fragile filter material when subjected to shock-like pressure loads, reinforced with resin. This can be done by forcing a liquid carrier of a e.g. phenolic or silicone resin into the material, but only to such a degree as to substantially reduce the filter properties of the material. The force required for this can be generated by a centrifuge or by vacuum or compression technique. Alternatively, the filter element may simply be immersed for a while in a resin solution. In order to hold the filter material in place during this process and when it is to act as a filter, a simple cylinder of a perforated support material may be added in such a way that this cylinder only touches the wavy top of the pleated filter material on the other side of the pleated filter material. After impregnation, the filter is inserted into an oven so that the resin can cure at the required temperature. Alternatively, prior to the pleating, the filter material may be impregnated with a resin which then cures at an elevated temperature.

Ved montering af de foroven beskrevne filterele-20 menter, hvor der som perforeret støttemateriale benyttes en indre og/eller en ydre glat cylinder, er det somme tider ønskeligt at indskyde et cylindrisk lag af et beskyttende materiale imellem det plisserede filterlag og cylinderen eller cylindrene, hvor det beskyttende ma-25 teriale er af en sådan art, at det kan beskytte det plisserede filtermateriale under monteringen.When mounting the above-described filter elements, where an inner and / or outer smooth cylinder is used as a perforated support material, it is sometimes desirable to insert a cylindrical layer of protective material between the pleated filter layer and the cylinder or cylinders. wherein the protective material is such that it can protect the pleated filter material during assembly.

Laget eller lagene af det beskyttende materiale skal være tilstrækkelig porøst til, at den filtrerede gas eller væske kan passere igennem. Uvævet nylon har 30 vist sig at være særlig anvendeligt, men uvævet polyester, rayon eller acrylmaterialer kan også anvendes, hvilket ligeledes gælder for vævede materialer, såsom vævede glasfibre.The layer (s) of the protective material must be sufficiently porous for the filtered gas or liquid to pass through. Nonwoven nylon has been found to be particularly useful, but nonwoven polyester, rayon or acrylic materials can also be used, as are woven materials, such as woven glass fibers.

Eksempelvis kan hvert lag i filtermaterialet med 35 fordel være 0,73 mm tykke, og basisfibrene kan væreFor example, each layer of the filter material may advantageously be 0.73 mm thick and the base fibers may be

Claims (7)

148952 fremstillet af mikrofibre af rent borsilikat-glas med en middeldiameter på 0,5 pm. Plisseringerne er fortrinsvis pakket ret tæt sammen. Som beskrevet i de tidligere eksempler kan fil-5 terelementet, som det er sædvane i forbindelse med plisserede, cylinderformede filterelementer, være fastgjort til endedæksler. Når et højeffektivt filter anvendes som oliefilter, er strømningen i almindelighed rettet fra indersi-10 den mod ydersiden, og olietågen omdannes fra en aerosol til en væske igennem filteret og ledes væk til den rolige zone i filterhuset, hvor det med jævne mellemrum kan tappes af. På grund af den mængde luft, der passerer igennem filteret, og den mængde olie, der drænes væk på 15 ydersiden, er der, for at nedsætte risikoen for tilbage-trængning af olie, anbragt en porøs plaststrømpe uden på filterelementet og lukket tæt mod endedækslerne for at forhindre lækage på dette sted. Fordi strømningen igennem filteret ifølge den 20 foreliggende opfindelse kan være betydelig kraftigere end igennem hermed sammenlignelige hidtil kendte filtre, har det vist sig, at det mest velegnede materiale for plaststrømpen set fra et drænings synspunkt og for at modvirke tilbagetrængning af olie er skumstof af 25 urethanester eller -ether med mindst 18 porer/cm i alle retninger.148952 made of pure borosilicate glass microfibre with a mean diameter of 0.5 µm. The pleats are preferably packed quite tightly together. As described in the previous examples, the filter element, as is customary in connection with pleated, cylindrical filter elements, may be attached to end caps. When a high-efficiency filter is used as an oil filter, the flow is generally directed from the inside to the outside, and the oil mist is converted from an aerosol into a liquid through the filter and routed away to the quiet zone of the filter housing, where it can periodically be drained off. . Due to the amount of air passing through the filter and the amount of oil drained away on the outside, to reduce the risk of oil backing, a porous plastic stocking was placed on the filter element and closed tightly against the end covers to prevent leakage at this location. Because the flow through the filter of the present invention can be considerably more powerful than that of comparable previously known filters, it has been found that the most suitable material for the plastic stocking from a drainage point of view and to counteract oil withdrawal is foam of 25 urethane esters. or ether with at least 18 pores / cm in all directions. 1. Filterelement til fluida og omfattende dels mindst ét cylinderformet ark (1) af uvævet, mikroporøst og fibrøst filtermateriale, som er imprægneret med et syntetisk harpiksbindemiddel, og som er plisseret i det væsentlige parallelt med det cylinderformede arks læng-35 deakse, dels mindst én perforeret støttecylinder (3) af 148952 forholdsvis stift materiale forsynet med perforeringer over hovedsagelig hele sin overflade og monteret stødende tæt op til det cylinder formede ark, så den støtter dette, medens det syntetiske harpiksbindemiddel støtter 5 det mikroporøse materiale i plisseringerne, kendetegnet ved, at filtermaterialet udgøres af en amorf masse af fibre af borsilikatglas, at en væsentlig mængde af disse fibre har en diameter på mellem 0,5 og 9,0 μπι og en længde på mellem 1 og 2 mm, medens de 10 øvrige fibre er op til 6 mm lange, og at arket har en tykkelse på mindst 0,73 mm.A fluid element filter element comprising at least one cylindrical sheet (1) of nonwoven, microporous and fibrous filter material impregnated with a synthetic resin binder which is pleated substantially parallel to the longitudinal axis of the cylindrical sheet and at least partly one perforated support cylinder (3) of relatively rigid material provided with perforations throughout its entire surface and mounted abuttingly close to the cylindrical sheet so as to support it, while the synthetic resin binder supports the microporous material in the pleats, characterized by, that the filter material is constituted by an amorphous mass of borosilicate glass fibers, that a substantial amount of these fibers have a diameter of between 0.5 and 9.0 µπι and a length of between 1 and 2 mm, while the other 10 fibers are up to 6 mm long and the sheet has a thickness of at least 0.73 mm. 2. Filterelement ifølge krav 1, kendetegnet ved, at arket (1) har en tykkelse på 1-12,7 mm.Filter element according to claim 1, characterized in that the sheet (1) has a thickness of 1-12.7 mm. 3. Filterelement ifølge krav 1, kende tegnet ved, at det plisserede filterark (18) er placeret mellem to perforerede støttecylindre (19 og 20).Filter element according to claim 1, characterized in that the pleated filter sheet (18) is located between two perforated support cylinders (19 and 20). 4. Filterelement ifølge ethvert af de foregående 20 krav, kendetegnet ved, at bindemidlet er en silikonharpiks.Filter element according to any one of the preceding claims, characterized in that the binder is a silicone resin. 5. Filterelement ifølge ethvert af de foregående krav, kendetegnet ved, at tykkelsen af det plisserede ark (1), målt mellem de ydre og indre bølge- 25 toppe, er højst 0,6 cm.Filter element according to any of the preceding claims, characterized in that the thickness of the pleated sheet (1), measured between the outer and inner wave peaks, is at most 0.6 cm. 6. Filterelement ifølge krav 1, kendetegnet ved, at det uvævede mikroporøse og fibrøse filtermateriale ved hjælp af et syntetisk harpiksbindemiddel er sammenbundet med et yderligere lag af uvævet 30 filtermateriale bestående af keramiske fibre, metalfibre, asbest, mineraluld, andre glasfibre eller organiske fibre.Filter element according to claim 1, characterized in that the nonwoven microporous and fibrous filter material is bonded to a further layer of nonwoven filter material consisting of ceramic fibers, metal fibers, asbestos, mineral wool, other glass fibers or organic fibers by means of a synthetic resin binder. 7. Filterelement ifølge ethvert af kravene 1-5, kendetegnet ved, at det plisserede ark (22) 35 af uvævet mikroporøst og fibrøst filtermateriale er belagt med et lag af aktivt kul (21).Filter element according to any one of claims 1-5, characterized in that the pleated sheet (22) 35 of nonwoven microporous and fibrous filter material is coated with a layer of activated carbon (21).
DK149577A 1976-04-05 1977-04-04 FILTER ELEMENT FOR FLUIDA DK148952C (en)

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
GB13640/76A GB1557821A (en) 1976-04-05 1976-04-05 Filters for liquids or gases
GB1364076 1976-04-05
GB1908376 1976-05-10
GB1908376 1976-05-10
GB4696976 1976-11-11
GB4696976 1976-11-11
GB968077 1977-03-08
GB968077 1977-03-08

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DK148952B true DK148952B (en) 1985-12-02
DK148952C DK148952C (en) 1986-06-09

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AU (1) AU510129B2 (en)
BR (1) BR7702120A (en)
CA (1) CA1076041A (en)
CH (1) CH619152A5 (en)
DE (1) DE2715204C2 (en)
DK (1) DK148952C (en)
ES (1) ES457536A1 (en)
FR (1) FR2347081A1 (en)
GR (1) GR60807B (en)
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AU510129B2 (en) 1980-06-12
ES457536A1 (en) 1978-11-16
DK149577A (en) 1977-10-06
CH619152A5 (en) 1980-09-15
DK148952C (en) 1986-06-09
ATA232877A (en) 1982-02-15
NL183871C (en) 1989-02-16
DE2715204C2 (en) 1984-03-29
AU2395577A (en) 1978-10-12
SE432201B (en) 1984-03-26
CA1076041A (en) 1980-04-22
NL7703681A (en) 1977-10-07
NL183871B (en) 1988-09-16
AT368401B (en) 1982-10-11
SE7703897L (en) 1977-10-06
FR2347081B1 (en) 1982-08-27
FR2347081A1 (en) 1977-11-04
JPS52144868A (en) 1977-12-02
GR60807B (en) 1978-08-30
DE2715204A1 (en) 1977-10-27
BR7702120A (en) 1977-12-20
JPS5626452B2 (en) 1981-06-18

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