EP0500420A1 - Filter cartridge - Google Patents

Filter cartridge Download PDF

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Publication number
EP0500420A1
EP0500420A1 EP92400369A EP92400369A EP0500420A1 EP 0500420 A1 EP0500420 A1 EP 0500420A1 EP 92400369 A EP92400369 A EP 92400369A EP 92400369 A EP92400369 A EP 92400369A EP 0500420 A1 EP0500420 A1 EP 0500420A1
Authority
EP
European Patent Office
Prior art keywords
filter
central
filter cartridge
peripheral
cartridge according
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.)
Withdrawn
Application number
EP92400369A
Other languages
German (de)
French (fr)
Inventor
Dominique Bacot
Jean-Michel Detroyat
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Detroyat Laurance Nee Martin
Detroyat Laurent
Detroyat Pierre-Eric
Lepic Emmanuelle Nee Detroyat
Original Assignee
Detroyat Laurance Nee Martin
Detroyat Laurent
Detroyat Pierre-Eric
Lepic Emmanuelle Nee Detroyat
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 Detroyat Laurance Nee Martin, Detroyat Laurent, Detroyat Pierre-Eric, Lepic Emmanuelle Nee Detroyat filed Critical Detroyat Laurance Nee Martin
Publication of EP0500420A1 publication Critical patent/EP0500420A1/en
Withdrawn legal-status Critical Current

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    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L9/00—Details or accessories of suction cleaners, e.g. mechanical means for controlling the suction or for effecting pulsating action; Storing devices specially adapted to suction cleaners or parts thereof; Carrying-vehicles specially adapted for suction cleaners
    • A47L9/10—Filters; Dust separators; Dust removal; Automatic exchange of filters
    • A47L9/12—Dry filters
    • A47L9/127—Dry filters tube- or sleeve-shaped
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L7/00—Suction cleaners adapted for additional purposes; Tables with suction openings for cleaning purposes; Containers for cleaning articles by suction; Suction cleaners adapted to cleaning of brushes; Suction cleaners adapted to taking-up liquids
    • A47L7/0004—Suction cleaners adapted to take up liquids, e.g. wet or dry vacuum cleaners
    • A47L7/0023—Recovery tanks
    • A47L7/0028—Security means, e.g. float valves or level switches for preventing overflow
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L7/00—Suction cleaners adapted for additional purposes; Tables with suction openings for cleaning purposes; Containers for cleaning articles by suction; Suction cleaners adapted to cleaning of brushes; Suction cleaners adapted to taking-up liquids
    • A47L7/0004—Suction cleaners adapted to take up liquids, e.g. wet or dry vacuum cleaners
    • A47L7/0042—Gaskets; Sealing means

Definitions

  • the present invention relates to filter cartridges which can be used in particular in domestic or industrial air vacuum cleaners.
  • the subject of the invention is a new type of filter cartridge with a large filtration surface suitable for the use of filter materials (fabrics, felts, membranes) having improved filtration characteristics, in particular with regard to clogging resistance, but which also have a fairly low resistance to folding or tearing.
  • filter materials fabrics, felts, membranes
  • the filter cartridge comprises a plurality of substantially cylindrical filter surfaces arranged coaxially to define at least one peripheral filter surface and at least one central filter surface and comprising a support element for holding the filter surfaces, said support element being associated to a sealing stop ring disposed at one end of the peripheral filter surface to define an axial opening for the filter cartridge, the cartridge being characterized in that the filter surfaces are made from a membrane having a microporous filtering layer preferably made of expanded polytetrafluoroethylene (PTFE), said microporous layer being disposed on the inlet side of the filter and in that the support element comprises a retaining grid adjacent over its entire surface to the peripheral filtering surface on the outlet side of the filter.
  • PTFE expanded polytetrafluoroethylene
  • the cartridge is intended to be mounted in a fluid pipe by means of fixing means to maintain said abutment ring in leaktight support on the wall of said pipe around an axial passage for discharging fluid after filtration.
  • the microporous layer is not in direct contact on the retaining grid but distant from the latter by the thickness (for example 1 millimeter) of the body of the membrane consisting of a sheet of fabric or of felt with which the microporous layer is associated.
  • the fluid the air
  • the position of the retaining grid although attached to the membrane by the action of the vacuum at the outlet of the filter, has no appreciable effect of reducing the active surface of the actual filtering surface (the microporous layer).
  • the filter cartridge comprises two filter surfaces, peripheral and central respectively, connected by a single ply or by a radial connecting ring, the central filter surface being closed by a rigid disk usable so optional to cooperate with said means for fixing the cartridge in the fluid line.
  • the filter cartridge comprises three filter surfaces, respectively peripheral, intermediate and central, connected in pairs by a fold or a radial connecting ring, said central filter surface being closed by a rigid disc.
  • the cartridge, intended to be used in a fluid pipe fitted around the axial evacuation passage of a shutter cage is adapted to the cage, itself chosen to be substantially cylindrical, to allow the central filtering surface and the disc cooperate in support, outlet side of the filter, with the cage.
  • the vacuum cleaner of the "bucket” type illustrated in FIG. 1 comprises a cylindrical body 10 provided with a chamber 11 dust receptacle 12 supplied with air to be filtered from a pipe 14.
  • the air is filtered through a filter cartridge according to the invention 16 by suction using a turbine 18 driven by an electric motor 20.
  • the conventional air circulation for a vacuum cleaner of the "bucket” type is illustrated by a course of arrows shown in the figure 1.
  • a first embodiment of a filter cartridge according to the invention is illustrated diagrammatically in perspective in FIG. 2 and in section in FIG. 3.
  • the cartridge 16 comprises a plurality of cylindrical filter surfaces (in this case two) arranged coaxially relative to the axis XX 'to define a peripheral filtering surface 22 and a central filtering surface 24.
  • the peripheral filtering surface 22 carries at one of its ends 25, a ring 26 of sealing stop defining the axial opening 34 of the cartridge and capable of coming into sealing support by means of a seal elastomer 28 on the wall 30 of the inlet pipe 32 of the vacuum cleaner turbine, around an axial passage 33 for evacuating the fluid after filtration.
  • the other end 27 of the peripheral filtering surface 22 carries a radial connecting plate (or connecting ring) with the neighboring end 29 of the adjacent filtering surface (in this case the central filtering surface 24). Finally the free end 31 of the central filtering surface 24 is closed by a rigid disc forming a partition 38. As illustrated in FIG. 3, the ring 26, the disc 38 and the radial plate 36 define partitioning elements of the cartridge. alternately mounted at the ends of the filter surfaces, cooperating with only one partition element. Furthermore, the central filtering surface 24 has a reduced axial length relative to the peripheral filtering surface 22 in order to provide a free discharge passage 35 for the filtered air towards the opening 34 and the axial passage 33.
  • the filtering surfaces are made from a membrane consisting for example of a sheet of fabric or felt covered with a thin microporous layer of expanded polytetrafluoroetylene (PTFE), the microporous layer being disposed on the inlet side of the filter (chamber 11) to avoid clogging internal at the level of the fabric or felt tablecloth.
  • the filtering surfaces 22 and 24 comprise a filter membrane with expanded PTFE sold under the brand "GORE-TEX" by the company "WL GORE &ASSOCIES” well suited to the field filtration in particular for dusting.
  • the cartridge is pressed against the wall 30 in a sealed manner by means of a tie rod 40 secured to the frame of the vacuum cleaner.
  • the free end of the tie rod 40 projects through the disc 38 to receive a mounting nut 42 as illustrated in FIG. 3.
  • the arrangement for mounting the filter cartridge on the wall 30 is such that the surface central filter (or membrane) 24 is subjected to axial tensile stresses (which the membrane 24 resists without using a specific holding device) while the peripheral filtering surface 22 is subjected to axial compressive stresses, which requires for the latter the addition of a perforated retaining grid 44 adjacent over its entire surface to the peripheral filtering surface and disposed on the outlet side of the filter.
  • the arrangement of the retaining grid 130 in the immediate vicinity of the peripheral filtering membrane 110 virtually eliminates the risks of tearing of the membrane.
  • the discs, radial plate and stop ring being made of metal or rigid plastic materials (PVC) secured to the filtering surfaces by heat sealing.
  • FIG. 4 illustrates a second embodiment of a filter cartridge according to the invention in which three cylindrical filter surfaces coaxial with respect to the axis YY 'have been provided.
  • This cartridge which is very similar in construction to that of the cartridge illustrated in FIGS. 2 and 3, will not be described again in detail.
  • the cartridge of FIG. 4 presents three cylindrical filtering surfaces produced from membranes with a microporous layer of expanded PTFE 110, 112 and 114 presented above (the microporous filtering layer being disposed on the inlet side of the filter).
  • the peripheral surface 110 carries at its ends the support ring 116 and the radial plate 118 connecting it to the intermediate filtering surface 112.
  • This latter filtering surface 112 carries at its other end the radial plate 120 connecting it to the central surface 114
  • the central plate 122 is closed at its free end by the rigid disc 122.
  • the cartridge is held in leaktight support through an elastomeric seal 123 on the wall 124, of the vacuum cleaner by means of the tie rod 126 (mounted through the axial opening 125), and of the nut 128 acting on the disc 122.
  • the two cylindrical filtering surfaces 110 and 114 subjected to compression are doubled by adjacent holding grids 130 and 132, as illustrated in FIG. 4 again, the fluid after filtration leaves the cartridge through the opening 125 towards the axial passage 127.
  • FIG. 5 illustrates a third embodiment of a filter cartridge according to the invention in which three filter surfaces 210, 212, 214 are provided which are substantially cylindrical (in fact slightly conical as illustrated in FIG. 5) coaxial with respect to the axis ZZ ' .
  • the three filter surfaces 210, 212 and 214 are produced from a membrane with a microporous layer of expanded PTFE presented above (the microporous filter layer being arranged on the inlet side of the filter).
  • the peripheral filtering surface 210 is held on the outlet side of the filter by an adjacent grid 216 with a large grid made of rigid plastic material (shown in dotted lines in the center of FIG. 5 so as not to overload the drawing).
  • the end of the grid 216 adjacent to the wall 218 of the fluid line 219 of the vacuum cleaner is folded down to form a support stop 220 capped with a seal made of elastomeric material 222 (in practice the seal 222 is overmolded on the stop 220 and on the corresponding end of the peripheral filtering surface 210).
  • the seal 222 is forcibly mounted on a shoulder 224 provided by the wall 218 around an axial evacuation passage 226, so as to allow the filter cartridge to be held in place in the vacuum cleaner .
  • the axial discharge passage 226 has a narrower diameter for receiving a float-shutter device (in this case a spherical float 228 mounted in a cage 230).
  • a float-shutter device in this case a spherical float 228 mounted in a cage 230.
  • This float is intended to protect the turbine 18 and the motor 20 in the event of suction of water or other liquid in the receptacle chamber 11.
  • the float 228 comes occupy the position illustrated in dotted lines in FIG. 5, bearing on a seat 232 and closes the axial passage 226 produced in the wall 218.
  • the filter membrane is pleated a first time at the other end of the retaining grid 216 (fold 211) to form the intermediate filter surface 212 and then a second time (fold 213) to form the central filter surface 214 the free end of which is closed by overmolding of a rigid disc 234 made of plastic, for example polypropylene.
  • the cage 230 of the generally substantially cylindrical float (in this case slightly frustoconical) has dimensions adapted to those of the central filtering surface 214, to allow close support cooperation (illustrated in FIG. 5) between the cage 230 , the central filtering surface 214 and the disc 234.
  • the bundle of lateral bars 236 of the cage 230 acts as an adjacent retaining grid for the surface 214.
  • the cage 230 comprises a bottom disc 238, optionally secured to the disc 234, and a mounting ring 240 secured to the wall 218 by any suitable fixing means not shown.
  • filter cartridges according to the invention is not limited to industrial and / or domestic air vacuum cleaners and extends to the field of filtration of gaseous and / or liquid fluids in general. filters for internal combustion engines, in particular for motor vehicles and public works machinery.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)

Abstract

The filter cartridge (16) comprises two coaxial cylindrical filter surfaces (22) and (24) made from a membrane covered with a layer of expanded polytetrafluoroethylene (PTFE). The filter surfaces (22) and (24) are firmly fixed together at their base (27) and (29) by a radial wall (36) and the central filter surface (24) is closed by a disc (38). A tie rod (40) stresses a ring (26) which is firmly fixed to the peripheral filter surface (22) bearing in a sealed manner against the wall (30) of a suction device. The peripheral filter cartridge (22) is lined with a retaining grid (44) on the output side of the filter. The filter cartridge (16) may be used in a household and/or industrial vacuum cleaner. <IMAGE>

Description

La présente invention concerne des cartouches filtrantes utilisables notamment dans des aspirateurs à air domestiques ou industriels.The present invention relates to filter cartridges which can be used in particular in domestic or industrial air vacuum cleaners.

Dans le domaine de la filtration, il s'avère souvent intéressant d'augmenter la surface de filtration d'un filtre en vue notamment de réduire les pertes de charge au niveau de ce dernier. On connaît en particulier des cartouches filtrantes à surface filtrante cylindrique constituée de papier filtrant plissé en accordéon. Toutefois, cette solution n'est pas applicable à tous les types de papiers ou tissus filtrants, certains d'entre eux étant susceptibles de déchirures au niveau des pliures.In the field of filtration, it often turns out to be advantageous to increase the filtration area of a filter with a view in particular to reducing the pressure drops at the level of the latter. Filter cartridges with a cylindrical filter surface made of filter paper pleated in an accordion are known in particular. However, this solution is not applicable to all types of filter papers or fabrics, some of them being susceptible to tears at the folds.

L'invention a pour objet un nouveau type de cartouche filtrante à grande surface de filtration adaptée pour l'utilisation de matériaux filtrants (tissus, feutres, membranes) présentant des caractéristiques de filtration améliorées, notamment vis à vis de la résistance au colmatage, mais qui par ailleurs présentent une résistance assez faible au pliage ou à la déchirure.The subject of the invention is a new type of filter cartridge with a large filtration surface suitable for the use of filter materials (fabrics, felts, membranes) having improved filtration characteristics, in particular with regard to clogging resistance, but which also have a fairly low resistance to folding or tearing.

Selon l'invention, la cartouche filtrante comporte une pluralité de surfaces filtrantes sensiblement cylindriques disposées coaxialement pour définir au moins une surface filtrante périphérique et au moins une surface filtrante centrale et comportant un élément support pour maintenir les surfaces filtrantes, ledit élément-support étant associé à un anneau de butée d'étanchéité disposé à l'une des extrémités de la surface filtrante périphérique pour définir une ouverture axiale pour la cartouche filtrante, la cartouche étant caractérisée en ce que les surfaces filtrantes sont réalisées à partir d'une membrane présentant une couche filtrante microporeuse de préférence en polytétrafluoréthylène (PTFE) expansé, ladite couche microporeuse étant disposée côté entrée du filtre et en ce que l'élément support comporte une grille de maintien adjacente sur toute sa surface à la surface filtrante périphérique côté sortie du filtre.According to the invention, the filter cartridge comprises a plurality of substantially cylindrical filter surfaces arranged coaxially to define at least one peripheral filter surface and at least one central filter surface and comprising a support element for holding the filter surfaces, said support element being associated to a sealing stop ring disposed at one end of the peripheral filter surface to define an axial opening for the filter cartridge, the cartridge being characterized in that the filter surfaces are made from a membrane having a microporous filtering layer preferably made of expanded polytetrafluoroethylene (PTFE), said microporous layer being disposed on the inlet side of the filter and in that the support element comprises a retaining grid adjacent over its entire surface to the peripheral filtering surface on the outlet side of the filter.

Avantageusement la cartouche est destinée à être montée dans une conduite de fluide par l'intermédiaire de moyens de fixation pour maintenir ledit anneau de butée en appui étanche sur la paroi de ladite conduite autour d'un passage axial d'évacuation de fluide après filtration.Advantageously, the cartridge is intended to be mounted in a fluid pipe by means of fixing means to maintain said abutment ring in leaktight support on the wall of said pipe around an axial passage for discharging fluid after filtration.

Il est à noter que la couche microporeuse n'est pas en contact direct sur la grille de maintien mais distante de cette dernière de l'épaisseur (par exemple 1 millimètre) du corps de la membrane constitué d'une nappe de tissu ou de feutre à laquelle la couche microporeuse est associée. Après filtration par la couche microporeuse, le fluide (l'air) est libre de traverser directement la nappe de tissu ou de feutre ou de cheminer transversalement dans l'épaisseur de cette nappe pour contourner le treillis constituant la grille de maintien. Ainsi donc, dans l'agencement selon l'invention la position de la grille de maintien, bien qu'accolée à la membrane par l'action de la dépression en sortie du filtre, n'a pas d'effet sensible de réduction de la surface active de la surface filtrante proprement dite (la couche microporeuse).It should be noted that the microporous layer is not in direct contact on the retaining grid but distant from the latter by the thickness (for example 1 millimeter) of the body of the membrane consisting of a sheet of fabric or of felt with which the microporous layer is associated. After filtration by the microporous layer, the fluid (the air) is free to pass directly through the sheet of fabric or felt or to traverse transversely in the thickness of this sheet to bypass the lattice constituting the retaining grid. Thus, in the arrangement according to the invention, the position of the retaining grid, although attached to the membrane by the action of the vacuum at the outlet of the filter, has no appreciable effect of reducing the active surface of the actual filtering surface (the microporous layer).

Selon un premier mode de réalisation de l'invention, la cartouche filtrante comporte deux surfaces filtrantes, respectivement périphérique et centrale, reliées par un pli unique ou par un anneau radial de liaison, la surface filtrante centrale étant fermée par un disque rigide utilisable de façon optionnelle pour coopérer avec lesdits moyens de fixation de la cartouche dans la conduite de fluide.According to a first embodiment of the invention, the filter cartridge comprises two filter surfaces, peripheral and central respectively, connected by a single ply or by a radial connecting ring, the central filter surface being closed by a rigid disk usable so optional to cooperate with said means for fixing the cartridge in the fluid line.

Selon un second mode de réalisation de l'invention, la cartouche filtrante comporte trois surfaces filtrantes, respectivement périphérique, intermédiaire et centrale, reliées deux à deux par un pli ou un anneau radial de liaison, ladite surface filtrante centrale étant fermée par un disque rigide. Avantageusement la cartouche, destinée à être utilisée dans une conduite de fluide équipée autour du passage axial d'évacuation d'une cage à obturateur est adaptée à la cage, elle-même choisie sensiblement cylindrique, pour permettre à la suface filtrante centrale et au disque de coopérer en appui, côté sortie du filtre, avec la cage.According to a second embodiment of the invention, the filter cartridge comprises three filter surfaces, respectively peripheral, intermediate and central, connected in pairs by a fold or a radial connecting ring, said central filter surface being closed by a rigid disc. . Advantageously, the cartridge, intended to be used in a fluid pipe fitted around the axial evacuation passage of a shutter cage is adapted to the cage, itself chosen to be substantially cylindrical, to allow the central filtering surface and the disc cooperate in support, outlet side of the filter, with the cage.

D'autres caractéristiques et avantages de la présente invention apparaitront à la lecture de la description qui va suivre en référence aux dessins ci-annexés dans lesquels :

  • - la figure 1 est une vue schématique en coupe d'un aspirateur du type "sceau" dans lequel est montée une cartouche filtrante selon l'invention.
  • - la figure 2 représente une vue schématique en perspective d'une cartouche filtrante selon l'invention.
  • - la figure 3 représente une vue schématique en coupe axiale de la cartouche filtrante de la figure 2.
  • - la figure 4 représente une vue schématique en coupe axiale d'un second modèle de cartouche filtrante selon l'invention.
  • - et la figure 5 représente une vue schématique en coupe axiale d'un troisième modèle de cartouche filtrante selon l'invention.
Other characteristics and advantages of the present invention will appear on reading the description which follows with reference to the attached drawings in which:
  • - Figure 1 is a schematic sectional view of a vacuum cleaner type "seal" in which is mounted a filter cartridge according to the invention.
  • - Figure 2 shows a schematic perspective view of a filter cartridge according to the invention.
  • FIG. 3 represents a schematic view in axial section of the filter cartridge of FIG. 2.
  • - Figure 4 shows a schematic view in axial section of a second model of filter cartridge according to the invention.
  • - And Figure 5 shows a schematic view in axial section of a third model of filter cartridge according to the invention.

L'aspirateur du type "seau"illustré à la figure 1 comporte un corps cylindrique 10 pourvu d'une chambre 11 réceptacle de poussière 12 alimentée en air à filtrer à partir d'une conduite 14. L'air est filtré au travers d'une cartouche filtrante selon l'invention 16 par aspiration à l'aide d'une turbine 18 entraînée par un moteur électrique 20. La circulation d'air classique pour un aspirateur du type "seau" est illustrée par un parcours de flèches montrées à la figure 1.The vacuum cleaner of the "bucket" type illustrated in FIG. 1 comprises a cylindrical body 10 provided with a chamber 11 dust receptacle 12 supplied with air to be filtered from a pipe 14. The air is filtered through a filter cartridge according to the invention 16 by suction using a turbine 18 driven by an electric motor 20. The conventional air circulation for a vacuum cleaner of the "bucket" type is illustrated by a course of arrows shown in the figure 1.

Un premier mode de réalisation d'une cartouche filtrante selon l'invention est illustrée schématiquement en perspective à la figure 2 et en coupe à la figure 3. La cartouche 16 comporte une pluralité de surfaces filtrantes cylindriques (en l'espèce deux) disposées coaxialement par rapport à l'axe XX' pour définir une surface filtrante périphérique 22 et une surface filtrante centrale 24. La surface filtrante périphérique 22 porte à une de ses extrémités 25, un anneau 26 de butée d'étanchéité définissant l'ouverture axiale 34 de la cartouche et susceptible de venir en appui étanche par l'intermédiaire d'un joint élastomère 28 sur la paroi 30 de la conduite d'entrée 32 de la turbine de l'aspirateur, autourd'un passage axial 33 d'évacuation du fluide après filtration. L'autre extrémité 27 de la surface filtrante périphérique 22 porte une plaque radiale de liaison (ou anneau de liaison) avec l'extrémité voisine 29 de la surface filtrante adjacente (en l'espèce la surface filtrante centrale 24). Enfin l'extrémité libre 31 de la surface filtrante centrale 24 est fermée par un disque rigide formant cloison 38. Comme illustrés sur la figure 3, l'anneau 26, le disque 38 et la plaque radiale 36 définissent des éléments de cloisonnement de la cartouche montés de façon alternée aux extrémités des surfaces filtrantes en ne coopérant qu'avec un seul élément de cloisonnement. Par ailleurs, la surface filtrante centrale 24 présente une longueur axiale réduite par rapport à la surface filtrante périphérique 22 pour dégager un libre passage d'évacuation 35 de l'air filtré vers l'ouverture 34 et le passage axiale 33. Les surfaces filtrantes sont réalisées à partir d'une membrane constituée par exemple d'une nappe de tissu ou de feutre recouverte d'une mince couche microporeuse de polytétrafluorétylène (PTFE) expansé, la couche microporeuse étant disposée côté entrée du filtre (chambre 11) pour éviter un colmatage interne au niveau de la nappe de tissu ou de feutre. Dans le mode de réalisation ici décrit à titre d'exemple non limitatif, les surfaces filtrantes 22 et 24 comportent une membrane filtrante à PTFE expansé commercialisée sous la marque "GORE-TEX" par la société "W.L. GORE & ASSOCIES" bien adaptée au domaine de la filtration en particulier pour le dépoussiérage.A first embodiment of a filter cartridge according to the invention is illustrated diagrammatically in perspective in FIG. 2 and in section in FIG. 3. The cartridge 16 comprises a plurality of cylindrical filter surfaces (in this case two) arranged coaxially relative to the axis XX 'to define a peripheral filtering surface 22 and a central filtering surface 24. The peripheral filtering surface 22 carries at one of its ends 25, a ring 26 of sealing stop defining the axial opening 34 of the cartridge and capable of coming into sealing support by means of a seal elastomer 28 on the wall 30 of the inlet pipe 32 of the vacuum cleaner turbine, around an axial passage 33 for evacuating the fluid after filtration. The other end 27 of the peripheral filtering surface 22 carries a radial connecting plate (or connecting ring) with the neighboring end 29 of the adjacent filtering surface (in this case the central filtering surface 24). Finally the free end 31 of the central filtering surface 24 is closed by a rigid disc forming a partition 38. As illustrated in FIG. 3, the ring 26, the disc 38 and the radial plate 36 define partitioning elements of the cartridge. alternately mounted at the ends of the filter surfaces, cooperating with only one partition element. Furthermore, the central filtering surface 24 has a reduced axial length relative to the peripheral filtering surface 22 in order to provide a free discharge passage 35 for the filtered air towards the opening 34 and the axial passage 33. The filtering surfaces are made from a membrane consisting for example of a sheet of fabric or felt covered with a thin microporous layer of expanded polytetrafluoroetylene (PTFE), the microporous layer being disposed on the inlet side of the filter (chamber 11) to avoid clogging internal at the level of the fabric or felt tablecloth. In the embodiment described here by way of nonlimiting example, the filtering surfaces 22 and 24 comprise a filter membrane with expanded PTFE sold under the brand "GORE-TEX" by the company "WL GORE &ASSOCIES" well suited to the field filtration in particular for dusting.

La cartouche est plaquée en appui étanche sur la paroi 30 par l'intermédiaire d'un tirant 40 solidaire du bâti de l'aspirateur. L'extrémité libre du tirant 40 se projette au travers du disque 38 pour recevoir un écrou de montage 42 comme illustré sur la figure 3. On peut remarquer que l'agencement de montage de la cartouche filtrante sur la paroi 30 est tel que la surface filtrante centrale (ou membrane) 24 est soumise à des efforts axiaux de traction (auxquels la membrane 24 résiste sans l'aide de dispositif de maintien particulier) tandis que la surface filtrante périphérique 22 est soumise à des efforts axiaux de compression, ce qui nécessite pour cette dernière l'ajonction d'une grille de maintien ajourée 44 adjacente sur toute sa surface à la surface filtrante périphérique et disposée côté sortie du filtre. La disposition de la grille de maintien 130 au voisinage immédiat de la membrane filtrante périphérique 110 élimine pratiquement les risques de déchirure de la membrane.The cartridge is pressed against the wall 30 in a sealed manner by means of a tie rod 40 secured to the frame of the vacuum cleaner. The free end of the tie rod 40 projects through the disc 38 to receive a mounting nut 42 as illustrated in FIG. 3. It may be noted that the arrangement for mounting the filter cartridge on the wall 30 is such that the surface central filter (or membrane) 24 is subjected to axial tensile stresses (which the membrane 24 resists without using a specific holding device) while the peripheral filtering surface 22 is subjected to axial compressive stresses, which requires for the latter the addition of a perforated retaining grid 44 adjacent over its entire surface to the peripheral filtering surface and disposed on the outlet side of the filter. The arrangement of the retaining grid 130 in the immediate vicinity of the peripheral filtering membrane 110 virtually eliminates the risks of tearing of the membrane.

Il est à noter la grande simplicité de construction de la cartouche filtrante selon l'invention, les disque, plaque radiale et anneau de butée étant réalisés en métal ou en matériaux plastiques rigide (PVC) solidarisés aux surfaces filtrantes par thermosoudage.It should be noted the great simplicity of construction of the filter cartridge according to the invention, the discs, radial plate and stop ring being made of metal or rigid plastic materials (PVC) secured to the filtering surfaces by heat sealing.

La figure 4 illustre un second mode de réalisation d'une cartouche filtrante selon l'invention dans laquelle on a prévu trois surfaces filtrantes cylindriques coaxiales par rapport à l'axe YY'. Cette cartouche qui est de construction très semblable à celle de la cartouche illustrée aux figures 2 et 3 ne sera pas décrite à nouveau en détails.FIG. 4 illustrates a second embodiment of a filter cartridge according to the invention in which three cylindrical filter surfaces coaxial with respect to the axis YY 'have been provided. This cartridge, which is very similar in construction to that of the cartridge illustrated in FIGS. 2 and 3, will not be described again in detail.

La cartouche de la figure 4 présente trois surfaces filtrantes cylindriques réalisées à partir de membranes à couche microporeuse de PTFE expansé 110, 112 et 114 présentées ci-avant (la couche filtrante microporeuse étant disposée côté entrée du filtre). La surface périphérique 110 porte à ses extrémités l'anneau d'appui 116 et la plaque radiale 118 la reliant à la surface filtrante intermédiaire 112. Cette dernière surface filtrante 112 porte à son autre extrémité la plaque radiale 120 la reliant à la surface centrale 114. Enfin, la plaque centrale 122 est fermée à son extrémité libre par le disque rigide 122. La cartouche est maintenue en appui étanche à travers un joint élastomère 123 sur la paroi 124, de l'aspirateur par l'intermédiaire du tirant 126 (monté au travers de l'ouverture axiale 125), et de l'écrou 128 agissant sur le disque 122. De plus, les deux surfaces filtrantes cylindriques 110 et 114 sollicitées en compression sont doublées par des grilles adjacentes de maintien 130 et 132, comme illustré sur la figure 4. Ici encore, le fluide après filtration sort de la cartouche par l'ouverture 125 vers le passage axial 127.The cartridge of FIG. 4 presents three cylindrical filtering surfaces produced from membranes with a microporous layer of expanded PTFE 110, 112 and 114 presented above (the microporous filtering layer being disposed on the inlet side of the filter). The peripheral surface 110 carries at its ends the support ring 116 and the radial plate 118 connecting it to the intermediate filtering surface 112. This latter filtering surface 112 carries at its other end the radial plate 120 connecting it to the central surface 114 Finally, the central plate 122 is closed at its free end by the rigid disc 122. The cartridge is held in leaktight support through an elastomeric seal 123 on the wall 124, of the vacuum cleaner by means of the tie rod 126 (mounted through the axial opening 125), and of the nut 128 acting on the disc 122. In addition, the two cylindrical filtering surfaces 110 and 114 subjected to compression are doubled by adjacent holding grids 130 and 132, as illustrated in FIG. 4 again, the fluid after filtration leaves the cartridge through the opening 125 towards the axial passage 127.

La figure 5 illustre un troisième mode de réalisation d'une cartouche filtrante selon l'invention dans laquelle on a prévu trois surfaces filtrantes 210,212,214 sensiblement cylindriques (en fait légèrement coniques comme illustré sur la figure 5) coaxiales par rapport à l'axe ZZ'. Les trois surfaces filtrantes 210,212 et 214 sont réalisées à partir d'une membrane à couche microporeuse de PTFE expansé présentée ci-avant (la couche filtrante microporeuse étant disposée côté entrée du filtre). La surface filtrante périphérique 210 est maintenue côté sortie du filtre par une grille adjacente 216 à large quadrillage réalisée en matériau plastique rigide (représentée en pointillé au centre de la figure 5 pour ne pas surcharger le dessin).FIG. 5 illustrates a third embodiment of a filter cartridge according to the invention in which three filter surfaces 210, 212, 214 are provided which are substantially cylindrical (in fact slightly conical as illustrated in FIG. 5) coaxial with respect to the axis ZZ ' . The three filter surfaces 210, 212 and 214 are produced from a membrane with a microporous layer of expanded PTFE presented above (the microporous filter layer being arranged on the inlet side of the filter). The peripheral filtering surface 210 is held on the outlet side of the filter by an adjacent grid 216 with a large grid made of rigid plastic material (shown in dotted lines in the center of FIG. 5 so as not to overload the drawing).

L'extrémité de la grille 216 adjacente à la paroi 218 de la conduite de fluide 219 de l'aspirateur est rabattue pour former une butée d'appui 220 coiffée d'un joint d'étanchéité en matériau élastomère 222 (en pratique le joint 222 est surmoulé sur la butée 220 et sur l'extrémité correspondante de la surface filtrante périphérique 210). Comme illustré sur la figure 5, le joint 222 est monté à force sur un épaulement 224 prévu par la paroi 218 autour d'un passage axial d'évacuation 226, de façon à permettre le maintien en place de la cartouche filtrante dans l'aspirateur. Par rapport à l'ouverture axiale 225 du filtre, le passage axial 226 d'évacuation présente un diamètre plus étroit pour recevoir un dispositif à flotteur-obturateur (en l'espèce un flotteur sphérique 228 monté dans une cage 230). Ce flotteur est destiné à protéger la turbine 18 et le moteur 20 en cas d'aspiration d'eau ou autre liquide dans la chambre receptacle 11. En particulier en cas de montée du niveau d'eau dans la chambre 11, le flotteur 228 vient occuper la position illustrée en pointillé sur la figure 5, en appui sur un siège 232 et obture le passage axial 226 réalisé dans la paroi 218.The end of the grid 216 adjacent to the wall 218 of the fluid line 219 of the vacuum cleaner is folded down to form a support stop 220 capped with a seal made of elastomeric material 222 (in practice the seal 222 is overmolded on the stop 220 and on the corresponding end of the peripheral filtering surface 210). As illustrated in FIG. 5, the seal 222 is forcibly mounted on a shoulder 224 provided by the wall 218 around an axial evacuation passage 226, so as to allow the filter cartridge to be held in place in the vacuum cleaner . By relative to the axial opening 225 of the filter, the axial discharge passage 226 has a narrower diameter for receiving a float-shutter device (in this case a spherical float 228 mounted in a cage 230). This float is intended to protect the turbine 18 and the motor 20 in the event of suction of water or other liquid in the receptacle chamber 11. In particular in the event of a rise in the water level in the chamber 11, the float 228 comes occupy the position illustrated in dotted lines in FIG. 5, bearing on a seat 232 and closes the axial passage 226 produced in the wall 218.

Comme illustré sur la figure 5, la membrane filtrante est plissée une première fois à l'autre extrémité de la grille de maintien 216 (pli 211) pourformerla surface filtrante intermédiaire 212 puis une seconde fois (pli 213) pour former la surface filtrante centrale 214 dont l'extrémité libre est fermée par surmoulage d'un disque rigide 234 en matière plastique, par exemple en polypropylène. La cage 230 du flotteur de forme générale sensiblement cylindrique (en l'espèce légèrement tronconique) a des dimensions adaptées à celles de la surface filtrante centrale 214, pour permettre une coopération d'appui étroite (illustrée à la figure 5) entre la cage 230, la surface filtrante centrale 214 et le disque 234. En particulier le faisceau de barres latérales 236 de la cage 230 fait fonction de grille de maintien adjacente pour la surface 214. Outre les barres 236, la cage 230 comporte un disque de fond 238, optionnellement solidarisé au disque 234, et un anneau de montage 240 solidarisé à la paroi 218 par tout moyen de fixation approprié non représenté.As illustrated in FIG. 5, the filter membrane is pleated a first time at the other end of the retaining grid 216 (fold 211) to form the intermediate filter surface 212 and then a second time (fold 213) to form the central filter surface 214 the free end of which is closed by overmolding of a rigid disc 234 made of plastic, for example polypropylene. The cage 230 of the generally substantially cylindrical float (in this case slightly frustoconical) has dimensions adapted to those of the central filtering surface 214, to allow close support cooperation (illustrated in FIG. 5) between the cage 230 , the central filtering surface 214 and the disc 234. In particular the bundle of lateral bars 236 of the cage 230 acts as an adjacent retaining grid for the surface 214. In addition to the bars 236, the cage 230 comprises a bottom disc 238, optionally secured to the disc 234, and a mounting ring 240 secured to the wall 218 by any suitable fixing means not shown.

Bien entendu, l'utilisation des cartouches filtrantes, selon l'invention, n'est pas limitée aux aspirateurs à air industriels et/ou domestiques et s'étend au domaine de la filtration de fluides en général gazeux et/ou liquides, en particulier aux filtres pour moteurs à combustion interne, notamment pour véhicules automobiles et engins de travaux publics.Of course, the use of filter cartridges according to the invention is not limited to industrial and / or domestic air vacuum cleaners and extends to the field of filtration of gaseous and / or liquid fluids in general. filters for internal combustion engines, in particular for motor vehicles and public works machinery.

Claims (8)

1) Cartouche filtrante comportant une pluralité de surfaces filtrantes sensiblement cylindriques (22-24, 110-112-114, 210-212-214) disposées coaxialement pour définir au moins une surface filtrante périphérique (22, 110, 210) et au moins une surface filtrante centrale (24,114,214) et comportant un élément-support (44, 130, 216) pour maintenir les surfaces filtrantes, ledit élément support étant associé à un anneau de butée d'étanchéité (26, 116, 220) disposé à l'une des extrémités de la surface filtrante périphérique (22, 110, 210) pour définir une ouverture axiale (34, 125, 226) pour la cartouche filtrante, caractérisée en ce que les surfaces filtrantes (22-24,110-112-114,210-212-214) sont réalisées à partir d'une membrane présentant une couche filtrante microporeuse de préférence en polytétrafluoréthylène (PTFE) expansé, ladite couche microporeuse étant disposée côté entrée du filtre, et en ce que l'élément-support comporte une grille de maintien (44, 130, 216) adjacente sur toute sa surface à la surface filtrante périphérique (22, 110, 210) côté sortie du filtre.1) Filter cartridge comprising a plurality of substantially cylindrical filter surfaces (22-24, 110-112-114, 210-212-214) arranged coaxially to define at least one peripheral filter surface (22, 110, 210) and at least one central filter surface (24,114,214) and comprising a support element (44, 130, 216) for holding the filter surfaces, said support element being associated with a sealing stop ring (26, 116, 220) disposed at one ends of the peripheral filter surface (22, 110, 210) to define an axial opening (34, 125, 226) for the filter cartridge, characterized in that the filter surfaces (22-24,110-112-114,210-212-214 ) are made from a membrane having a microporous filtering layer preferably made of expanded polytetrafluoroethylene (PTFE), said microporous layer being disposed on the inlet side of the filter, and in that the support element comprises a hand grid Yours (44, 130, 216) adjacent over its entire surface to the peripheral filtering surface (22, 110, 210) on the outlet side of the filter. 2) Cartouche selon la revendication 1 caractérisée en ce que la cartouche est destinée à être montée dans une conduite de fluide (32,219) par l'intermédiaire de moyens de fixation (40-42,126-128,222-224) pour maintenir ledit anneau de butée (26,116,220) en appui étanche sur la paroi (30,124,218) de ladite conduite autour d'un passage axial d'évacuation (33,127,226) du fluide après filtration.2) Cartridge according to claim 1 characterized in that the cartridge is intended to be mounted in a fluid line (32,219) by means of fixing means (40-42,126-128,222-224) to maintain said abutment ring ( 26,116,220) in sealed support on the wall (30,124,218) of said pipe around an axial evacuation passage (33,127,226) of the fluid after filtration. 3) Cartouche filtrante selon l'une des revendications 1 et 2, caractérisée en ce qu'elle comporte deux surfaces filtrantes, respectivement périphérique (22) et centrale (24), reliées par un pli unique ou par un anneau radial de liaison (36), la surface filtrante centrale (24) étant fermée par un disque rigide (38) utilisable de façon optionnelle pour coopérer avec lesdits moyens de fixation (40-42) de la cartouche dans la conduite de fluide.3) Filter cartridge according to one of claims 1 and 2, characterized in that it comprises two filter surfaces, respectively peripheral (22) and central (24), connected by a single ply or by a radial connecting ring (36 ), the central filtering surface (24) being closed by a rigid disc (38) which can optionally be used to cooperate with said fixing means (40-42) of the cartridge in the fluid line. 4) Cartouche filtrante selon l'une des revendications 1 et 2, caractérisée en ce qu'elle comporte trois surfaces filtrantes, respectivement périphérique (110,210) intermédiaire (112,212) et centrale (114,214), reliées deux à deux par un pli (211-213) ou un anneau radial de liaison (118-120), ladite surface filtrante centrale (114,214) étant fermée par un disque rigide (122,234).4) Filter cartridge according to one of claims 1 and 2, characterized in that it comprises three filter surfaces, respectively peripheral (110,210) intermediate (112,212) and central (114,214), connected in pairs by a fold (211- 213) or a radial connecting ring (118-120), said central filtering surface (114,214) being closed by a rigid disc (122,234). 5) Cartouche filtrante selon l'une des revendications 3 et 4 caractérisée en ce que le disque rigide (234) est surmoulé sur l'extrémité libre de la surface filtrante centrale (214).5) Filter cartridge according to one of claims 3 and 4 characterized in that the rigid disc (234) is molded onto the free end of the central filtering surface (214). 6) Cartouche filtrante selon les revendications 2 et 4 prises en combinaison, destinée à être utilisée dans une conduite de fluide (219) équipée, autour dudit passage axial d'évacuation (226), d'une cage à obturateur (228-230), caractérisée en ce que la cartouche est adaptée à la cage (230), elle-même choisie sensiblement cylindrique, pour permettre à la surface filtrante centrale (214) et au disque (234) de coopérer en appui, côté sortie du filtre, avec la cage (230).6) Filter cartridge according to claims 2 and 4 taken in combination, intended to be used in a fluid line (219) equipped, around said axial discharge passage (226), with a shutter cage (228-230) , characterized in that the cartridge is adapted to the cage (230), itself chosen to be substantially cylindrical, to allow the central filtering surface (214) and the disc (234) to cooperate in support, on the outlet side of the filter, with the cage (230). 7) Cartouche filtrante selon l'une des revendications précédentes caractérisée en ce que les surfaces filtrantes (210,212,214) sont légèrement coniques.7) Filter cartridge according to one of the preceding claims, characterized in that the filter surfaces (210,212,214) are slightly conical. 8) Cartouche filtrante selon l'une des revendications 2 à 7, caractérisée en ce que l'anneau de butée d'étanchéité (220) porte un joint élastique destiné à être monté à force sur un épaulement (224) de la paroi (218) de la conduite de fluide entourant le passage axial (226) d'évacuation.8) Filter cartridge according to one of claims 2 to 7, characterized in that the sealing stop ring (220) carries an elastic seal intended to be force-fitted on a shoulder (224) of the wall (218 ) of the fluid line surrounding the axial passage (226) for evacuation.
EP92400369A 1991-02-13 1992-02-10 Filter cartridge Withdrawn EP0500420A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9101697A FR2672511A1 (en) 1991-02-13 1991-02-13 FILTER CARTRIDGE.
FR9101697 1991-02-13

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EP0500420A1 true EP0500420A1 (en) 1992-08-26

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FR (1) FR2672511A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997011632A1 (en) * 1995-09-29 1997-04-03 W.L. Gore & Associates, Inc. Improved method for employing wet/dry vacuum cleaners for wet material collection
WO1998007361A1 (en) * 1996-08-21 1998-02-26 W.L. Gore & Associates, Inc. Filter for a wet/dry vacuum cleaner for wet material collection
EP1118303A2 (en) * 1999-12-18 2001-07-25 WAP Reinigungssysteme GmbH & Co. Method and device for dedusting the filter of a vacuum cleaner with partitioned filter chamber
EP1362543A1 (en) * 2002-05-13 2003-11-19 S.I.EL S.r.l. Cleaning apparatus comprising a liquid filtering element
WO2011069508A1 (en) 2009-12-11 2011-06-16 Nordic Air Filtration A/S A filter for the removal of particles from gas flows

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DE1507827A1 (en) * 1966-06-24 1970-01-02 Hartmann Ag Maschf Bag filter
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EP0005599A1 (en) * 1978-05-03 1979-11-28 Virginia Chemicals, Inc. Two-way filter-drier
DE3444387A1 (en) * 1984-01-03 1985-07-11 Hr Textron Inc., Valencia, Calif. FILTER ELEMENT
EP0218317A2 (en) * 1985-10-04 1987-04-15 Harold James Beard Filter for intra-channel clarifier

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Publication number Priority date Publication date Assignee Title
DE473974C (en) * 1924-02-04 1929-03-22 Fisker & Nielsen As Reversible filter bag for vacuum cleaner
AT271401B (en) * 1965-03-15 1969-06-10 Sueddeutsche Kalkstickstoff Filter device
DE1507827A1 (en) * 1966-06-24 1970-01-02 Hartmann Ag Maschf Bag filter
DE1507866A1 (en) * 1966-10-20 1971-05-27 Guenter Sander Round filter with zigzag covering
DE1948837A1 (en) * 1968-10-04 1970-04-09 Ici Ltd Process for the production of platinum compounds
EP0005599A1 (en) * 1978-05-03 1979-11-28 Virginia Chemicals, Inc. Two-way filter-drier
DE3444387A1 (en) * 1984-01-03 1985-07-11 Hr Textron Inc., Valencia, Calif. FILTER ELEMENT
EP0218317A2 (en) * 1985-10-04 1987-04-15 Harold James Beard Filter for intra-channel clarifier

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997011632A1 (en) * 1995-09-29 1997-04-03 W.L. Gore & Associates, Inc. Improved method for employing wet/dry vacuum cleaners for wet material collection
US5783086A (en) * 1995-09-29 1998-07-21 W. L. Gore & Associates, Inc. Filter for a wet/dry vacuum cleaner for wet material collection
WO1998007361A1 (en) * 1996-08-21 1998-02-26 W.L. Gore & Associates, Inc. Filter for a wet/dry vacuum cleaner for wet material collection
EP1118303A2 (en) * 1999-12-18 2001-07-25 WAP Reinigungssysteme GmbH & Co. Method and device for dedusting the filter of a vacuum cleaner with partitioned filter chamber
EP1118303A3 (en) * 1999-12-18 2002-12-11 WAP Reinigungssysteme GmbH & Co. Method and device for dedusting the filter of a vacuum cleaner with partitioned filter chamber
EP1362543A1 (en) * 2002-05-13 2003-11-19 S.I.EL S.r.l. Cleaning apparatus comprising a liquid filtering element
WO2011069508A1 (en) 2009-12-11 2011-06-16 Nordic Air Filtration A/S A filter for the removal of particles from gas flows

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