EP1759769B1 - Filtervorrichtung mit einer mit einem Filtertuch und mindestens zwei Expansionsreifen - Google Patents

Filtervorrichtung mit einer mit einem Filtertuch und mindestens zwei Expansionsreifen Download PDF

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Publication number
EP1759769B1
EP1759769B1 EP06356105A EP06356105A EP1759769B1 EP 1759769 B1 EP1759769 B1 EP 1759769B1 EP 06356105 A EP06356105 A EP 06356105A EP 06356105 A EP06356105 A EP 06356105A EP 1759769 B1 EP1759769 B1 EP 1759769B1
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EP
European Patent Office
Prior art keywords
basket
hoops
strapping
intended
hoop
Prior art date
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Active
Application number
EP06356105A
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English (en)
French (fr)
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EP1759769A1 (de
Inventor
Lionel Birken
Pascal Sartori
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Individual
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Individual
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B7/00—Elements of centrifuges
    • B04B7/08—Rotary bowls
    • B04B7/12—Inserts, e.g. armouring plates
    • B04B7/16—Sieves or filters

Definitions

  • the present invention relates to a filtration device intended to be arranged in a wringer with a basket.
  • the chemical and pharmaceutical industry routinely uses wringers, to separate during a manufacturing process, a solid phase of a liquid phase.
  • a wringer comprises in particular a basket comprising a perforated wall of cylindrical shape in which are formed holes for the passage of the liquid, and two end walls, called edge and plate, perpendicular to the axis of the cylinder formed by the perforated wall cylindrical.
  • This basket is rotated about the axis of the cylindrical wall in order to centrifugally drive the liquid to the outside of the basket.
  • a filter cloth is used to retain the solid particles and allow the liquid to pass through its mesh, the filtering cloth being placed in contact with the cylindrical wall of the basket.
  • the fabric may be metallic in some applications, but it is most often synthetic material, usually polypropylene.
  • the canvas is in the form of a rectangle, which must be wrapped in the basket, in the form of a cylinder.
  • the height of the basket is generally substantially equal to the radius.
  • the width of the canvas rectangle is therefore approximately equal to the height of the basket, its length at the perimeter of the basket.
  • FIG. figure 1 In order to achieve the attachment of the fabric in the basket, it is known, according to a first possibility, as shown in FIG. figure 1 , to use a basket 2 having two grooves 3, 4, formed in the basket 2, on its end walls 5, 6 near the two edges of the perforated wall 7, in which the fabric 8 is fixed by the intermediate braids or ropes 9, 10, in particular being made of cotton, polypropylene, PTFE or elastomer, forced into the two grooves 3, 4 and blocking the fabric.
  • the intermediate braids or ropes 9, 10 in particular being made of cotton, polypropylene, PTFE or elastomer
  • This second possibility makes it possible to simplify the assembly with respect to the first possibility.
  • this second possibility has the following drawbacks: the metal strapping represent a significant cost, and deform if they are bent with a radius of curvature too low, for example when introduced into the basket.
  • this type of assembly requires the presence of rounded grooves formed on the basket, and the positioning of the straps facing these grooves is sometimes difficult.
  • Loops are sometimes sewn along the two long sides of the canvas, so you can slip a strapping inside. The assembly is then easier, but the other disadvantages remain.
  • the rounded grooves may not be sufficient, and the strapping easily out of their location.
  • rims of rectangular section are used, to facilitate slightly the positioning.
  • the end pieces are no longer screwed or unscrewed against each other, but consist respectively of a male rack-and-pinion jaw and a female rack-and-pinion jaw.
  • All these metal strapping, and particularly round section strapping, can not be used on a basket originally intended for an assembly with braids, because the throats are of different shape and size, and are placed differently. New grooves could be machined, but the strength of the basket would then be seriously reduced, posing a significant risk of rupture.
  • the document DE 29 38 684 has a filtration device in which a filter cloth is fixed in the basket by means of rigid metal hoops independent of the fabric.
  • rigid metal hoops can not be reduced to a diameter smaller than that of the basket of the filter device, without risk of irreversible deformation.
  • the fabric may slip under the straps during operation of the filtration device.
  • the object of the present invention is to provide a filtering device intended to be arranged in a wringer with a basket, the fixing is simplified, does not require the use of grooves and can be used with different types of basket , without risk of slipping of the canvas.
  • the subject of the present invention is a filtering device intended to be arranged in a wringer comprising a basket comprising a perforated wall allowing the passage of liquid, intended to be rotated in order to centrifugally drive the liquid towards the drum.
  • a flexible filter cloth intended to be applied against the perforated wall of the basket, characterized in that it further comprises at least two flexible strapping integral with the fabric, and to maintain it in position in Cart, the device comprising at least a plurality of attachment points between the fabric and the straps holding the straps in place relative to the fabric to prevent any relative movement of the fabric and the strapping whether or not the fabric is fixed in the basket.
  • the fastening of the canvas and flexible strapping allows to enter directly into the basket, by winding it on a small diameter, which allows a quick installation of the filter cloth.
  • this fastening prevents slippage of the fabric relative to the strapping.
  • the good tension of filter cloth obtained thanks to the integral strapping allows scraping as close as possible to the filter cloth.
  • This device can be used with all types of known basket with grooves.
  • Each device can be delivered ready for use at the user, eliminating the need for a cut to be made on site that can leave son of the fabric may be mixed with the product to be separated.
  • the canvases are reusable, unlike canvases mounted with braids.
  • the flexible strapping is welded, polyfused or glued on the fabric at several points or continuously.
  • the flexible strapping is made of plastic.
  • plastic strapping can be rolled on a smaller diameter than the basket, without the risk of irreversible deformation,
  • the set is disposable, so there is no risk of cross-contamination between two products.
  • each of the ends of a strapping is respectively equipped with tensioning means, in particular by screwing, the tensioning means of the two ends being intended to cooperate to achieve tensioning of the strapping.
  • the device comprises transverse reinforcements connecting the at least two hoops.
  • the device further comprises at least one metal strapping intended to bear on a flexible strapping.
  • At least one flexible strapping includes a groove for receiving the metal strapping.
  • the device comprises a draining grid intended to be arranged between the filter cloth and the perforated wall of the basket, fixed by two connecting elements to two secondary hoops.
  • the secondary strapping comprises at their ends a substantially sealed connection.
  • the figure 1 is a schematic sectional view of a device of the prior art comprising grooves and braids mounted in force.
  • the figure 2 is a schematic sectional view of a device of the prior art comprising grooves and metal hoops.
  • the figure 3 is a schematic view of the device, seen from the front, according to a first embodiment.
  • the figure 4 is a schematic view of the means of tensioning the device of figure 3 , seen in section perpendicular to the plane of the filter cloth.
  • the figure 5 is a schematic view of the means of tensioning the device of figure 3 , seen in section parallel to the plane of the filter cloth.
  • the figure 6 is a schematic view of the means of tensioning the device of figure 3 , seen in section perpendicular to the plane of the filter cloth, according to an alternative embodiment.
  • the figure 7 is a schematic view of the means of tensioning the device of figure 3 , seen in section perpendicular to the plane of the filter cloth, according to another embodiment.
  • the figure 8 is a schematic sectional view of the filtration device positioned in a wringer basket.
  • the figure 9 is a schematic view of the device, seen from the front, according to a second embodiment.
  • the figure 10 is a schematic view, in section perpendicular to the plane of the filter cloth, of the drainage means associated with the filtration device.
  • the figure 11 is a partial front view of the drainage means of figure 10 .
  • the figure 12 is a schematic view of the device, seen from the front, according to a third embodiment.
  • the flexible straps 18, 19 are welded or polyfused on the fabric 17 at several points or continuously, on the two long sides of the fabric 17, which has, unfolded, a rectangular shape.
  • Flexible strapping 18, 19 may in particular be made of plastic, for example polypropylene type when the filter cloth is itself made of polypropylene.
  • the rings 18, 19 are formed by profiles forming strips a few millimeters thick and a few centimeters wide.
  • the small thickness of the straps 18, 19 allows the filtering device 16 to maintain flexibility to match the curvature of the basket 2.
  • the straps 18, 19 are glued, screwed, sewn, nested, pinched on the filter cloth 17.
  • a combination of these modes of attachment could also be used.
  • Each strapping 18, 19 comprises an end 20 located at the edge of a first small side of the rectangle formed by the fabric 17, and a second end 22 set back from the edge of a second small side of the rectangle formed by the fabric 17.
  • Each of the ends 20, 22 of a strapping 18, 19 is respectively equipped with tensioning means 23, 24, the tensioning means 23, 24 of the two ends being intended to cooperate to achieve tensioning of the strapping 18, 19, the tensioning being carried out by means of one or two screws.
  • the tensioning means 23, arranged at a first end 20 of the strapping 18 are constituted by a tip or a screw 25, located in the axis of the strapping 18 whose body is threaded and cooperates with the tapping of a tip intermediate 26 itself assembled by screws 27 on the profile 18.
  • the head of the screw 25 comprises holes opening 28 laterally, offset by 90 °, for screwing and unscrewing the screw 25 relative to the intermediate nozzle 26.
  • the head of the screw comprises a concave front face 29 intended to cooperate with the convex front face 32 of a screw 30 of the complementary tensioning means 24 disposed on the second end 22 of the strapping 18.
  • These tensioning means 24 have the same characteristics as the means 23 located on the first end 20 of the strapping 18 outside the convex shape of the end face 32 of the screw 30.
  • the tapping of the intermediate tip 26 is made in a metal insert 33 of the intermediate tip 26, so as to allow better holding of the screw.
  • the tensioning means 23, 24 can be directly attached to the strapping 18, as shown in FIG. figure 6 if the strapping 18 has a sufficient thickness, compatible with the stress of flexibility, the metal insert 33 being directly fixed in the strapping. No intermediate tip is then used.
  • an end piece 34 is fitted on the strapping 18, this end piece having no metal insert.
  • an intermediate nozzle may be in particular fixed by welding, gluing, casing, polyfusion on the strapping.
  • the strapping used to fix the fabric may not include tensioning means, each of the two ends of the strapping then coming into contact with one of the other through a cutout or coupling of the male / female type.
  • This type of cutting is particularly represented in figure 11 , as detailed below.
  • the optional intermediate end may be made of the same plastic as the strapping or other plastic or metal material.
  • the device 35 comprises, in addition to the elements of the first embodiment, transverse reinforcements 36 connecting the two hoops, along the generatrices of the basket, to stiffen the assembly, and prevent the two hoops 18, 19 from approaching each other. one of the other.
  • These reinforcements 36 are fixed, according to different variants by welding, sewing, gluing, interlocking.
  • These reinforcements 36 are particularly useful in the case where the tightening performed by the operator is insufficient.
  • the device is delivered to the user's installation site rolled up to a diameter of approximately 40 to 50 cm, depending on the size of the fabric and the rigidity of the straps 18, 19.
  • the fabric is unfolded in the basket 2, then is applied by hand against the perforated wall 7 of the basket.
  • the screws or endpieces 25, 30 of each strapping 18, 19 being screwed completely, they are brought into contact one against the other, then a first strapping 18 is positioned correctly in the first angle of the basket 2, before being weakly energized.
  • the screws or end pieces of the second strapping are positioned in the second angle of the basket 2, before being weakly put in tension also.
  • the straps are spread apart as much as possible, so as to tension the web 17.
  • the screws or end pieces 25, 30 are then unscrewed to the maximum, in order to block the fabric 17 in this configuration, as shown on the figure 8 .
  • the complete assembly lasts, according to an exemplary embodiment, between 5 and 10 minutes.
  • the straps 18, 19 constitute an extra thickness with respect to the fabric 17. When a scraper is used, it must be kept at a minimum distance of 12 mm from the fabric.
  • the two angles of the scraper, opposite the strapping can be cut, so as to scrape much closer to the canvas. It is thus possible to reduce the residual layer of solid material remaining at the end of scraping to 8 or even 5 mm, against 10 or 15 mm currently.
  • the device comprises a draining grid 37, represented on the Figures 10 and 11 installed under the filter cloth 17, allowing the liquid to drain under the filter cloth, to the holes of the perforated basket.
  • the grid can not be easily welded to a plastic strapping, the two large edges of the rectangular grid are each assembled on a strip of tissue 38 or a very thin strip of plastic. Each strip is then assembled, in particular by welding, polyfusion, gluing or screwing to a plastic strapping 39.
  • a male / female cutout 40 is made at each end, which is particularly visible on the figure 11 .
  • the assembly thus formed is simply deposited in the basket. It is then the straps 18, 19 of the device 16, 35 which bear on it and hold it in place.
  • the device further comprises elements of the first embodiment, two metal strapping 45 intended to bear on the two flexible strapping 43 fixed on the cloth 42, each flexible strapping 43 comprising a groove 44 intended to receive the metal strapping 45.

Landscapes

  • Filtration Of Liquid (AREA)
  • Filtering Materials (AREA)
  • Centrifugal Separators (AREA)
  • Nonwoven Fabrics (AREA)
  • Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)

Claims (10)

  1. Filtervorrichtung (16, 35), die dazu bestimmt ist, in einer Zentrifuge angeordnet zu werden, die einen Korb (2) mit einer den Durchgang von Flüssigkeit ermöglichenden perforierten Wand (7) enthält, der dazu bestimmt ist, rotatorisch angetrieben zu werden, um die Flüssigkeit durch Zentrifugieren aus dem Korb (2) zu treiben, mit einem nachgiebigen Filterstoff (17), der dazu bestimmt ist, gegen die perforierte Wand des Korbs gedrückt zu werden, dadurch gekennzeichnet, dass sie außerdem wenigstens zwei nachgiebige Umreifungen (18, 19) aufweist, die mit dem Stoff (17) fest verbunden sind und ermöglichen, diesen an seiner Position im Korb (2) zu halten,
    wobei die Vorrichtung wenigstens eine Mehrzahl Befestigungspunkte zwischen dem Stoff (17) und den Umreifungen (18, 19) aufweist, die die Umreifungen (18, 19) in Bezug auf den Stoff (17) an ihrer Position halten, um jegliche Relativbewegung des Stoffs und der Umreifungen (18, 19) unabhängig davon zu verhindern, ob der Stoff in dem Korb (2) befestigt ist oder nicht.
  2. Vorrichtung (16, 35) nach Anspruch 1, dadurch gekennzeichnet, dass die nachgiebigen Umreifungen (18, 19) an mehreren Punkten oder kontinuierlich auf den Stoff (17) geschweißt, polygeschmolzen oder geklebt sind.
  3. Vorrichtung (16, 35) nach einem der Ansprüche 1 und 2, dadurch gekennzeichnet, dass die nachgiebigen Umreifungen (18, 19) aus Kunststoff hergestellt sind.
  4. Vorrichtung (16, 35) nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass jedes der Enden (20, 22) einer Umreifung (18, 19) jeweils mit Zugbeaufschlagungsmitteln (23, 24) ausgerüstet ist, wobei die Zugbeaufschlagungsmittel (23, 24) der zwei Enden dazu bestimmt sind, zusammenzuwirken, um die Umreifung (18, 19) mit Zug zu beaufschlagen.
  5. Vorrichtung (16, 35) nach Anspruch 4, dadurch gekennzeichnet, dass die Zugbeaufschlagungsmittel (23, 24), die insbesondere durch Schrauben arbeiten, zusammenarbeiten mit:
    - einem metallischen Einsatz (33), der an jedem Ende der Umreifung (18, 19) angeordnet ist, oder
    - einem Zwischenansatz (26), der an jedem Ende der Umreifung befestigt ist und einen metallischen Einsatz (26) aufweist oder nicht aufweist.
  6. Vorrichtung (16, 35) nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass sie transversale Verstärkungen (36) aufweist, die die wenigstens zwei Umreifungen (18, 19) verbinden.
  7. Vorrichtung (16, 35) nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass sie außerdem wenigstens eine metallische Umreifung (45) aufweist, die dazu bestimmt ist, sich an einer nachgiebigen Umreifung (18, 19) abzustützen.
  8. Vorrichtung (35) nach Anspruch 7, dadurch gekennzeichnet, dass wenigstens eine nachgiebige Umreifung (18, 19) eine Kehle (44) aufweist, die dazu bestimmt ist, die metallische Umreifung (45) aufzunehmen.
  9. Vorrichtung (16, 35) nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass sie ein Flüssigkeitsabführgitter (37) aufweist, das dazu bestimmt ist, zwischen dem Filterstoff (17) und der perforierten Wand (7) des Korbs (2) angeordnet zu werden, und durch zwei Verbindungselemente (38) an zwei sekundären Umreifungen (39) befestigt ist.
  10. Vorrichtung (16, 35) nach Anspruch 9, dadurch gekennzeichnet, dass die sekundären Umreifungen (39) an ihren Enden eine im Wesentlichen dichte Verbindung (40) aufweisen.
EP06356105A 2005-09-05 2006-09-05 Filtervorrichtung mit einer mit einem Filtertuch und mindestens zwei Expansionsreifen Active EP1759769B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0509047A FR2890320B1 (fr) 2005-09-05 2005-09-05 Toile d'essorage

Publications (2)

Publication Number Publication Date
EP1759769A1 EP1759769A1 (de) 2007-03-07
EP1759769B1 true EP1759769B1 (de) 2009-04-08

Family

ID=36499197

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06356105A Active EP1759769B1 (de) 2005-09-05 2006-09-05 Filtervorrichtung mit einer mit einem Filtertuch und mindestens zwei Expansionsreifen

Country Status (4)

Country Link
EP (1) EP1759769B1 (de)
AT (1) ATE427785T1 (de)
DE (1) DE602006006124D1 (de)
FR (1) FR2890320B1 (de)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3283909A (en) * 1963-12-20 1966-11-08 Ametek Inc Centrifugal separator
DE2938684A1 (de) * 1979-09-25 1981-04-09 Krauss-Maffei AG, 8000 München Vorrichtung zum einspannen von filtertuechern in zentrifugentrommeln
IT1193579B (it) * 1981-02-26 1988-07-08 Comi Condor Spa Disposizione di fissaggio del setto filtrante al paniere nelle centrifughe
DE4407515C1 (de) * 1994-03-07 1995-08-17 Krauss Maffei Ag Vorrichtung zum Einspannen eines Filtermittels in einer Zentrifugentrommel
JPH10180144A (ja) * 1996-12-26 1998-07-07 Mitsubishi Kakoki Kaisha Ltd 遠心濾過機用濾材の固定金具
US6761821B2 (en) * 2002-09-23 2004-07-13 Weatherford/Lamb, Inc. Clamping-hook ring

Also Published As

Publication number Publication date
DE602006006124D1 (de) 2009-05-20
ATE427785T1 (de) 2009-04-15
FR2890320B1 (fr) 2007-11-23
FR2890320A1 (fr) 2007-03-09
EP1759769A1 (de) 2007-03-07

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