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EP2253382A2 - Device for holding a filter film or a filter cloth - Google Patents

Device for holding a filter film or a filter cloth Download PDF

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Publication number
EP2253382A2
EP2253382A2 EP10006128A EP10006128A EP2253382A2 EP 2253382 A2 EP2253382 A2 EP 2253382A2 EP 10006128 A EP10006128 A EP 10006128A EP 10006128 A EP10006128 A EP 10006128A EP 2253382 A2 EP2253382 A2 EP 2253382A2
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EP
European Patent Office
Prior art keywords
protective screen
filter
filter cloth
protective
screen
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.)
Granted
Application number
EP10006128A
Other languages
German (de)
French (fr)
Other versions
EP2253382A8 (en
EP2253382B1 (en
EP2253382A3 (en
Inventor
Guntram Krettek
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Individual
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Individual
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Publication of EP2253382A2 publication Critical patent/EP2253382A2/en
Publication of EP2253382A8 publication Critical patent/EP2253382A8/en
Publication of EP2253382A3 publication Critical patent/EP2253382A3/en
Application granted granted Critical
Publication of EP2253382B1 publication Critical patent/EP2253382B1/en
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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
    • 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
    • B04B7/18—Rotary bowls formed or coated with sieving or filtering elements

Definitions

  • the present invention relates to a device for holding a filter film or a filter cloth, which rests in the installed state in a centrifuge drum on a support means, in particular a support screen, with a protective screen and with a sealing element with sealing lips, between which in the installed state itself extending the edges of the support means and the filter foil or the filter cloth, wherein in the installed state, the protective sieve clamps the filter foil or the filter cloth and the support means between the sealing lips of the sealing element.
  • Filtration devices for the separation of microfine solids from suspensions are formed in many forms as centrifuges.
  • filter elements with adequate retention are required.
  • filter films or filter cloths are used. These filter sheets or filter cloths are usually placed on support means, in particular on support screens.
  • a thickening layer of the retained solid particles forms on the filter films or filter cloths, which must be removed at appropriate time intervals.
  • the scraper or the knife for discharging or discharging the solid layer can not be moved up to the filter film or the filter cloth to avoid damage, but also because, for example, folds in the cloth do not allow this.
  • a bias voltage is applied in the radial direction with the aid of the protective screen, so that the edges of the support screen and the filter foil or the filter cloth are securely fixed between the sealing lips of the sealing element.
  • the corresponding Andschreibsky is reinforced in the operating condition by the centrifugal force.
  • the filter film or the filter cloth is fixed on the entire surface properly on the support screen, and the latter is pressed under this bias to the drum shell.
  • the invention has for its object to provide a device for holding a filter foil or a filter cloth of the specified type, with which the filter foil or the filter cloth is kept particularly secure.
  • the device further comprises at least one clamping ring which presses the protective screen radially outward in the installed state and that the protective screen is provided on its inside with at least one projection of the installed Clamping ring fixed in the axial direction.
  • At least one clamping ring use that presses the protective screen radially outward in the installed state and thus against the two sealing elements at the edges of the filter film and the filter cloth suppressed. These are thereby brought to rest on the inner surface of the drum shell, and the edges of the support screen and filter foil or filter cloth are securely fixed between the sealing lips of the sealing elements.
  • the invention provides that the protective screen has on its inside at least one projection which fixes the installed clamping ring in the axial direction.
  • the latter has at least one clamping ring which can be arranged in the axially middle region of the protective screen.
  • This clamping ring can move or move in both axial directions, so that here projections on both sides of the clamping ring are arranged on the protective screen.
  • clamping rings used in the invention are known as such and of conventional design. They may preferably have a round, square or flat cross section and are preferably formed in two parts, d. H. have two turnbuckles, which mesh with a left-handed and a right-hand thread, so that in this way a tightening can be done without problems. It is understood that of course other embodiments of clamping rings can be used.
  • inventively provided clamping rings is not specified.
  • a single clamping ring can be used, which is preferably arranged axially in the middle.
  • two clamping rings are provided, each of which is disposed in an axial end portion of the protective screen. But it can also be used more than two clamping rings, which are arranged at intervals over the axial length of the protective screen could be.
  • the protective screen is provided on its inside with corresponding projections to prevent axial movement of the clamping rings.
  • the projection on the inside of the protective screen is formed by a structuring or profiling thereof. In this embodiment, therefore, the projection is generated by a deformation of the protective screen.
  • the projection is formed by a cam. This cam can for example be welded, screwed, riveted or glued.
  • cam here not only punctiform protruding sections, but also strip-shaped projecting sections are meant.
  • the projection may extend around the entire circumference of the protective screen or only part of it.
  • the projection is formed by a bent-back edge tabs of the protective screen.
  • This edge tab can be bent back for example by 90 ° or by 180 °.
  • Such a marginal lobe can be easily produced by two adjacent slots made on the edge of the protective screen and the area located therebetween is bent back by the desired angle.
  • the bent back Condition forms the corresponding tab then the corresponding axial fixation for the clamping ring.
  • centrifuge drum 1 has a drum shell 2, on the inside of a support screen 3, a filter cloth 4 and a protective screen 5 are arranged (in FIG. 2 shown on a larger scale).
  • the support wire 3 rests on the inside of the drum shell 2, on which the filter cloth 8 lies tightly against.
  • the protective screen 5, which has corresponding passage openings is pressed by bias against the filter cloth 4 so that it rests firmly on the support screen 3.
  • FIG. 2 the support screen 3, the filter cloth 4 and the protective screen 5 are shown in the unstressed state for a better understanding. In operation, however, all parts are close together.
  • the support wire 3 and the filter cloth 4 are held in two annular sealing elements 6, which are arranged in the region of the bottom and the lid of the centrifuge drum.
  • clamping rings 7 are arranged on the inside of the protective screen 5, which rest on the axial edge regions of the protective screen, d. H. are arranged on the bottom and on the lid of the centrifuge drum.
  • the clamping rings 7 are formed in two parts and each have two turnbuckles 9, with which they are braced while exerting a radial pressure on the protective sieve 5.

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  • Centrifugal Separators (AREA)

Abstract

The device has a protective strainer (5) and a sealing element (6) with sealing lips. The protective strainer firmly clamps a filter foil or a filter cloth (4) and a support unit, particularly a support strainer (3) between the sealing lips of the sealing element in the installed condition. The device also has a clamping ring (7) which compresses the protective strainer radially outwards in the installed condition. The protective screen is provided at its inner side with a projection (8) which fixes the installed clamping ring in axial direction.

Description

Die vorliegende Erfindung betrifft einer Vorrichtung zum Halten einer Filterfolie oder eines Filtertuches, die bzw. das im installierten Zustand in einer Zentrifugentrommel auf einer Stützeinrichtung, insbesondere einem Stützsieb, aufliegt, mit einem Schutzsieb und mit einem Dichtelement mit Dichtlippen, zwischen denen im installierten Zustand sich die Ränder der Stützeinrichtung und der Filterfolie oder des Filtertuches erstrecken, wobei im installierten Zustand das Schutzsieb die Filterfolie oder das Filtertuch und die Stützeinrichtung zwischen den Dichtlippen des Dichtelementes festklemmt.The present invention relates to a device for holding a filter film or a filter cloth, which rests in the installed state in a centrifuge drum on a support means, in particular a support screen, with a protective screen and with a sealing element with sealing lips, between which in the installed state itself extending the edges of the support means and the filter foil or the filter cloth, wherein in the installed state, the protective sieve clamps the filter foil or the filter cloth and the support means between the sealing lips of the sealing element.

Filtrationseinrichtungen zum Abscheiden von mikrofeinen Feststoffanteilen aus Suspensionen werden in vielfältiger Form als Zentrifugen ausgebildet. Zum Abtrennen der mikrofeinen Feststoffanteile, wie sie typischerweise in Suspensionen bei chemischen Prozessen anfallen, sind Filterelemente mit entsprechendem Rückhaltevermögen erforderlich. Hierzu werden überwiegend auswechselbare Filterfolien oder Filtertücher verwendet. Diese Filterfolien bzw. Filtertücher sind normalerweise auf Stützeinrichtungen, insbesondere auf Stützsieben, aufgelegt.Filtration devices for the separation of microfine solids from suspensions are formed in many forms as centrifuges. To separate the microfine solids, as typically incurred in suspensions in chemical processes, filter elements with adequate retention are required. For this purpose, mainly replaceable filter films or filter cloths are used. These filter sheets or filter cloths are usually placed on support means, in particular on support screens.

Auf den Filterfolien bzw. Filtertüchern bildet sich im Betrieb eine dicker werdende Schicht aus den zurückgehaltenen Feststoffpartikeln, die in entsprechenden Zeitabständen abgetragen werden muss. Dabei können der Schaber bzw. die Messer zum Ab- bzw. Austragen der Feststoffschicht nicht bis ganz an die Filterfolie bzw. das Filtertuch herangefahren werden, um Beschädigungen zu vermeiden, aber auch, weil beispielsweise Falten im Tuch dies nicht zulassen.During operation, a thickening layer of the retained solid particles forms on the filter films or filter cloths, which must be removed at appropriate time intervals. The scraper or the knife for discharging or discharging the solid layer can not be moved up to the filter film or the filter cloth to avoid damage, but also because, for example, folds in the cloth do not allow this.

Die Befestigung der Filterfolie bzw. des Filtertuches erfolgt beispielsweise über Spannrahmen oder Spannringe mit Schrauben oder Nuten, in denen das Filtertuch gehalten wird. Insbesondere bei Zentrifugen, bei denen die Filterfolie bzw. das Filtertuch in der Trommel auf einem Stützsieb aufliegt, sind die Filtertuchbefestigungen herstellungsmäßig schwierig und teuer. Zur Lösung dieses Problems ist aus der DE 39 16 383 C2 eine Vorrichtung zum Halten von Filterfolien oder Filtertüchern bekannt geworden, die am Anfang dieser Beschreibung erläutert ist. Diese Vorrichtung weist ein Schutzsieb auf, durch das eine Beschädigung der Filterfolie oder des Filtertuches beim Abtragen oder Ausräumen der Feststoffschicht sicher vermieden wird. Es ist dabei möglich, diese Schicht nahezu vollständig abzutragen, da der Schaber bzw. die Messer bis auf das Schutzsieb herangefahren werden können. Darüber hinaus wird mit Hilfe des Schutzsiebes in radialer Richtung eine Vorspannung aufgebracht, so dass die Ränder des Stützsiebes und der Filterfolie oder des Filtertuches sicher zwischen den Dichtlippen des Dichtelementes fixiert werden. Der entsprechende Andrückeffekt wird im Betriebszustand durch die Fliehkraft verstärkt. Die Filterfolie bzw. das Filtertuch wird auf der gesamten Fläche einwandfrei auf dem Stützsieb fixiert, und letzteres wird unter dieser Vorspannung an den Trommelmantel gepresst.The attachment of the filter film or the filter cloth, for example, via clamping frame or clamping rings with screws or grooves in which the filter cloth is held. Especially in centrifuges in which the filter foil or the filter cloth rests in the drum on a support screen, the filter cloth fasteners are difficult to manufacture and expensive. To solve this problem is out of the DE 39 16 383 C2 a device for holding filter sheets or filter cloths has become known, which is explained at the beginning of this description. This device has a protective screen, through which damage to the filter film or the filter cloth when removing or removing the solid layer is reliably avoided. It is possible to remove this layer almost completely, since the scraper or the knife can be moved up to the protective screen. In addition, a bias voltage is applied in the radial direction with the aid of the protective screen, so that the edges of the support screen and the filter foil or the filter cloth are securely fixed between the sealing lips of the sealing element. The corresponding Andrückeffekt is reinforced in the operating condition by the centrifugal force. The filter film or the filter cloth is fixed on the entire surface properly on the support screen, and the latter is pressed under this bias to the drum shell.

Die bekannte Vorrichtung hat sich im Betrieb bewährt. Zur Erzeugung der für eine vollständige Auflage auf dem Filtertuch ausreichenden Vorspannung weist das Schutzsieb einen an sich bekannten Steckverschluss auf. Für diesen Steckverschluss sind die radialen Ränder des Schutzsiebes mit Schlitzen bzw. Einschnitten versehen, die ineinander geschoben werden und damit das Schutzsieb unter Spannung setzen. Diese Spannung drückt bereits im Stillstand das Schutzsieb auf die Dichtelemente, bringt diese zur Anlage auf der Innenfläche des Trommelmantels und hält die Ränder von Stützsieb und Filterfolie bzw. Filtertuch zwischen den Dichtlippen sicher fest.The known device has proven itself in operation. To produce sufficient for a complete support on the filter cloth bias, the protective screen has a known plug-in closure. For this plug-in closure, the radial edges of the protective screen are provided with slots or incisions which are pushed into each other and thus put the protective screen under tension. This tension already presses the protective screen at a standstill on the sealing elements, brings them to rest on the inner surface of the drum shell and holds the edges of the support screen and filter foil or filter cloth between the sealing lips securely.

Bei Zentrifugentrommeln, die mit hohen Drehzahlen arbeiten, ist die auf diese Weise mit dem Schutzsieb erzeugte Vorspannung völlig ausreichend. Es ergeben sich jedoch immer mehr Anwendungsbereiche für derartige Zentrifugen, bei denen mit relativ niedrigen Drehzahlen gearbeitet werden muss, um eine schonende Behandlung des zu filtrierenden Materiales zu ermöglichen. Hierbei besteht die Gefahr, dass die auf die vorstehend geschilderte Weise mit dem Schutzsieb aufgebrachte Vorspannung zum Fixieren der Filterfolie bzw. des Filtertuches nicht ausreicht, um die Filterfolie bzw. das Filtertuch sicher zu fixieren. Die Filterfolie bzw. das Filtertuch kann sich daher in Betrieb lösen, was zu Beschädigungen mit entsprechenden Stillliegezeiten und Reparaturarbeiten führen kann.In the case of centrifuge drums which operate at high speeds, the pretensioning produced in this way with the protective sieve is quite sufficient. However, there are more and more applications for such centrifuges, which must be done at relatively low speeds to allow a gentle treatment of the material to be filtered. In this case, there is a risk that the bias applied to the protective screen in the manner described above for fixing the filter foil or the filter cloth is not sufficient to securely fix the filter film or the filter cloth. The filter foil or the filter cloth can therefore come loose in operation, which can lead to damage with corresponding downtime and repair work.

Der Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung zum Halten einer Filterfolie oder eines Filtertuches der angegebenen Art zu schaffen, mit der die Filterfolie oder das Filtertuch besonders sicher gehalten wird.The invention has for its object to provide a device for holding a filter foil or a filter cloth of the specified type, with which the filter foil or the filter cloth is kept particularly secure.

Diese Aufgabe wird erfindungsgemäß bei einer Vorrichtung der eingangs beschriebenen Art dadurch gelöst, dass die Vorrichtung ferner mindestens einem Spannring aufweist, der im installierten Zustand das Schutzsieb radial nach außen presst und dass das Schutzsieb auf seiner Innenseite mit mindestens einem Vorsprung versehen ist, der den installierten Spannring in Axialrichtung fixiert.This object is achieved in a device of the type described above in that the device further comprises at least one clamping ring which presses the protective screen radially outward in the installed state and that the protective screen is provided on its inside with at least one projection of the installed Clamping ring fixed in the axial direction.

Bei der erfindungsgemäßen Vorrichtung findet somit zusätzlich zu einem Schutzsieb, mit dem eine radiale Vorspannung aufgebracht werden kann, mindestens ein Spannring Verwendung, der im installierten Zustand das Schutzsieb radial nach außen presst und damit gegen die beiden Dichtelemente an den Rändern der Filterfolie bzw. des Filtertuches drückt. Diese werden hierdurch zur Anlage auf der Innenfläche des Trommelmantels gebracht, und die Ränder von Stützsieb und Filterfolie bzw. Filtertuch werden zwischen den Dichtlippen der Dichtelemente sicher fixiert.In the device according to the invention thus in addition to a protective screen with which a radial bias can be applied, at least one clamping ring use that presses the protective screen radially outward in the installed state and thus against the two sealing elements at the edges of the filter film and the filter cloth suppressed. These are thereby brought to rest on the inner surface of the drum shell, and the edges of the support screen and filter foil or filter cloth are securely fixed between the sealing lips of the sealing elements.

Es ist zwar bekannt, Filterfolien bzw. Filtertücher mit Hilfe von Spannrahmen und Spannringen mit Schrauben oder Nuten, in denen die Filterfolie bzw. das Filtertuch gehalten wird, zu befestigen. Nicht bekannt ist es jedoch, derartige Spannringe in Verbindung mit Sieben einzusetzen, um auf diese Weise die von den Schutzsieben aufgebrachte Vorspannung zu erhöhen und eine noch bessere Fixierung der Filterfolie bzw. des Filtertuches und/oder der Stützeinrichtung, insbesondere des Stützsiebes, zu erreichen.Although it is known to fasten filter sheets or filter cloths by means of clamping frames and clamping rings with screws or grooves in which the filter film or the filter cloth is held. However, it is not known to use such clamping rings in conjunction with sieves, in order to increase the prestressing applied by the protective sieves and to achieve an even better fixation of the filter foil or of the filter cloth and / or the supporting device, in particular of the support sieve.

Überraschenderweise wurde festgestellt, dass bei Anordnung eines derartigen Spannringes an der Innenseite des Schutzsiebes die Gefahr besteht, dass sich der Spannring im Betrieb in Axialrichtung verschieben kann. Dies ist natürlich unerwünscht, da hierdurch die Funktionsweise der Zentrifugentrommel beeinträchtigt wird, insbesondere die Gefahr besteht, dass der Schaber bzw. die Messer mit dem Spannring kollidieren. Bei der Anordnung eines derartigen Spannringes ist der Schaber bzw. sind die Messer vorzugsweise an der entsprechenden Stelle ausgenommen, so dass sich keine unerwünschten Kontakte ergeben. Um eine derartige Axialverschiebung des Spannringes zu verhindern, ist erfindungsgemäß vorgesehen, dass das Schutzsieb auf seiner Innenseite mindestens einen Vorsprung aufweist, der den installierten Spannring in Axialrichtung fixiert.Surprisingly, it was found that in the arrangement of such a clamping ring on the inside of the protective screen there is a risk that the clamping ring can move in the axial direction during operation. Of course, this is undesirable since this impairs the functioning of the centrifuge drum, in particular the risk that the scraper or the blades will collide with the clamping ring. In the arrangement of such a clamping ring of the scraper or the blades are preferably excluded at the appropriate location, so that there are no unwanted contacts. To prevent such axial displacement of the clamping ring, the invention provides that the protective screen has on its inside at least one projection which fixes the installed clamping ring in the axial direction.

Vorzugsweise besitzt die Vorrichtung zwei Spannringe für die beiden axialen Endbereiche des Schutzsiebes und weist das Schutzsieb mindestens zwei Vorsprünge zur Verhinderung einer Axialverschiebung der Spannringe auf. Wenn die Spannringe in den Endbereichen des Schutzsiebes vorgesehen sind, ist es normalerweise ausreichend, eine Axialbewegung der Spannringe zur axialen Mitte des Schutzsiebes hin zu verhindern, so dass nur auf einer Seite (zur axialen Mitte des Schutzsiebes hin) des Spannringes mindestens ein entsprechender Vorsprung angeordnet sein muss.Preferably, the device has two clamping rings for the two axial end portions of the protective screen and the protective screen has at least two projections for preventing axial displacement of the clamping rings. If the clamping rings are provided in the end regions of the protective screen, it is usually sufficient to prevent axial movement of the clamping rings towards the axial center of the protective screen so that at least one corresponding projection must be arranged only on one side (towards the axial center of the protective screen) of the clamping ring.

Bei einer anderen Ausführungsform der Vorrichtung weist diese mindestens einen im axial mittleren Bereich des Schutzsiebes anordbaren Spannring auf. Dieser Spannring kann sich in beiden axialen Richtungen bewegen bzw. verschieben, so dass hier Vorsprünge an beiden Seiten des Spannringes am Schutzsieb angeordnet sind.In another embodiment of the device, the latter has at least one clamping ring which can be arranged in the axially middle region of the protective screen. This clamping ring can move or move in both axial directions, so that here projections on both sides of the clamping ring are arranged on the protective screen.

Die erfindungsgemäß verwendeten Spannringe sind als solche bekannt und von üblicher Bauart. Sie können vorzugsweise einen runden, quadratischen oder flachen Querschnitt besitzen und sind vorzugsweise zweiteilig ausgebildet, d. h. besitzen zwei Spannschlösser, die mit einem linksgängigen und einem rechtgängigen Gewinde kämmen, so dass auf diese Weise ein Verspannen unproblematisch erfolgen kann. Es versteht sich, dass natürlich auch andere Ausführungsformen von Spannringen Verwendung finden können.The clamping rings used in the invention are known as such and of conventional design. They may preferably have a round, square or flat cross section and are preferably formed in two parts, d. H. have two turnbuckles, which mesh with a left-handed and a right-hand thread, so that in this way a tightening can be done without problems. It is understood that of course other embodiments of clamping rings can be used.

Die Anzahl der erfindungsgemäß vorgesehenen Spannringe ist nicht festgelegt. Im einfachsten Fall kann ein einziger Spannring Verwendung finden, der vorzugsweise axial mittig angeordnet ist. Bei einer anderen Ausführungsform sind zwei Spannringe vorgesehen, von denen jeder in einem axialen Endbereich des Schutzsiebes angeordnet ist. Es können aber auch mehr als zwei Spannringe Verwendung finden, welche in Abständen über die axiale Länge des Schutzsiebes angeordnet sein können. Je nach der Anzahl der vorgesehenen Spannringe ist das Schutzsieb auf seiner Innenseite mit entsprechenden Vorsprüngen versehen, um Axialbewegungen der Spannringe zu verhindern.The number of inventively provided clamping rings is not specified. In the simplest case, a single clamping ring can be used, which is preferably arranged axially in the middle. In another embodiment, two clamping rings are provided, each of which is disposed in an axial end portion of the protective screen. But it can also be used more than two clamping rings, which are arranged at intervals over the axial length of the protective screen could be. Depending on the number of clamping rings provided, the protective screen is provided on its inside with corresponding projections to prevent axial movement of the clamping rings.

Was die Ausbildung des mindestens einen Vorsprungs anbetrifft, so sind diverse Ausführungsformen möglich. Bei einer bevorzugten Ausführungsform ist der Vorsprung auf der Innenseite des Schutzsiebes von einer Strukturierung bzw. Profilierung desselben gebildet. Bei dieser Ausführungsform wird daher der Vorsprung durch eine Verformung des Schutzsiebes erzeugt. Bei einer anderen Ausführungsform ist der Vorsprung von einem Nocken gebildet. Dieser Nocken kann beispielsweise aufgeschweißt, aufgeschraubt, aufgenietet oder aufgeklebt sein. Mit "Nocken" sind hier nicht nur punktförmige vorstehende Abschnitte, sondern auch leistenförmige vorstehende Abschnitte gemeint.As far as the formation of the at least one projection is concerned, various embodiments are possible. In a preferred embodiment, the projection on the inside of the protective screen is formed by a structuring or profiling thereof. In this embodiment, therefore, the projection is generated by a deformation of the protective screen. In another embodiment, the projection is formed by a cam. This cam can for example be welded, screwed, riveted or glued. By "cam" here not only punctiform protruding sections, but also strip-shaped projecting sections are meant.

Der Vorsprung kann sich um den gesamten Umfang des Schutzsiebes oder nur um einen Teil desselben erstrecken.The projection may extend around the entire circumference of the protective screen or only part of it.

Bei einer besonders bevorzugten Ausführungsform der Erfindung, bei der der Spannring im axialen Endbereich des Schutzsiebes angeordnet ist, ist der Vorsprung von einem zurückgebogenen Randlappen des Schutzsiebes gebildet. Dieser Randlappen kann beispielsweise um 90° oder um 180° zurückgebogen sein. Ein solcher Randlappen lässt sich einfach herstellen, indem zwei benachbarte Schlitze am Rand des Schutzsiebes hergestellt und der dazwischen befindliche Bereich um den gewünschten Winkel zurückgebogen wird. Im zurückgebogenen Zustand bildet der entsprechende Lappen dann die entsprechende Axialfixierung für den Spannring.In a particularly preferred embodiment of the invention, in which the clamping ring is arranged in the axial end region of the protective screen, the projection is formed by a bent-back edge tabs of the protective screen. This edge tab can be bent back for example by 90 ° or by 180 °. Such a marginal lobe can be easily produced by two adjacent slots made on the edge of the protective screen and the area located therebetween is bent back by the desired angle. In the bent back Condition forms the corresponding tab then the corresponding axial fixation for the clamping ring.

Die Erfindung wird nachfolgend anhand eines Ausführungsbeispiels in Verbindung mit der Zeichnung im Einzelnen erläutert. Es zeigen:

Figur 1
eine geschnittene Zentrifugentrommel in räumli- cher Darstellung;
Figur 2
ein Detail an der Stelle A in Figur 1; und
Figur 3
die Darstellung eines Randlappens zur axialen Fixierung eines Spannringes.
The invention will be explained below with reference to an embodiment in conjunction with the drawings in detail. Show it:
FIG. 1
a cut centrifuge drum in a spatial representation;
FIG. 2
a detail at the point A in FIG. 1 ; and
FIG. 3
the representation of a Randlappens for axial fixation of a clamping ring.

Die in Figur 1 dargestellte Zentrifugentrommel 1 weist einen Trommelmantel 2 auf, auf dessen Innenseite ein Stützsieb 3, ein Filtertuch 4 und ein Schutzsieb 5 angeordnet sind (in Figur 2 im größeren Maßstab gezeigt). Das Stützsieb 3 liegt auf der Innenseite des Trommelmantels 2 auf, darauf liegt das Filtertuch 8 dicht anliegend auf. Das Schutzsieb 5, das entsprechende Durchlassöffnungen aufweist, wird durch Vorspannung fest gegen das Filtertuch 4 gedrückt, so dass dieses fest auf dem Stützsieb 3 aufliegt. In Figur 2 sind das Stützsieb 3, das Filtertuch 4 und das Schutzsieb 5 zum besseren Verständnis im unverspannten Zustand dargestellt. Im Betriebszustand liegen jedoch alle Teile dicht aufeinander. Das Stützsieb 3 und das Filtertuch 4 werden in zwei ringförmigen Dichtelementen 6 gehalten, die im Bereich des Bodens und des Deckels der Zentrifugentrommel angeordnet sind. Die ringförmigen Dichtelemente 6 weisen drei Dichtlippen 10 auf, die zwei Kammern bilden, in denen die Ränder des Stützsiebes 3 und des Filtertuches 4 im flachgepressten Zustand angeordnet sind. Nach Einbau des Stützsiebes 3 und des Filtertuches 4 zusammen mit den Dichtelementen 6 wird das Schutzsieb 5 so eingelegt, dass es auf die inneren Flächen der Dichtelemente 6 drückt und auf dem Filtertuch unter Spannung aufliegt.In the FIG. 1 shown centrifuge drum 1 has a drum shell 2, on the inside of a support screen 3, a filter cloth 4 and a protective screen 5 are arranged (in FIG. 2 shown on a larger scale). The support wire 3 rests on the inside of the drum shell 2, on which the filter cloth 8 lies tightly against. The protective screen 5, which has corresponding passage openings is pressed by bias against the filter cloth 4 so that it rests firmly on the support screen 3. In FIG. 2 the support screen 3, the filter cloth 4 and the protective screen 5 are shown in the unstressed state for a better understanding. In operation, however, all parts are close together. The support wire 3 and the filter cloth 4 are held in two annular sealing elements 6, which are arranged in the region of the bottom and the lid of the centrifuge drum. The annular sealing elements 6 have three sealing lips 10 which form two chambers in which the edges of the support screen 3 and the filter cloth 4 are arranged in the flat pressed state. After installation of the support screen 3 and the filter cloth 4 together with the sealing elements 6, the protective screen 5 is inserted so that it presses on the inner surfaces of the sealing elements 6 and rests on the filter cloth under tension.

Zusätzlich sind an der Innenseite des Schutzsiebes 5 zwei Spannringe 7 angeordnet, welche auf den axialen Randbereichen des Schutzsiebes aufliegen, d. h. am Boden und am Deckel der Zentrifugentrommel angeordnet sind. Die Spannringe 7 sind zweiteilig ausgebildet und weisen jeweils zwei Spannschlösser 9 auf, mit denen sie verspannt werden und dabei einen radialen Druck auf das Schutzsieb 5 ausüben.In addition, two clamping rings 7 are arranged on the inside of the protective screen 5, which rest on the axial edge regions of the protective screen, d. H. are arranged on the bottom and on the lid of the centrifuge drum. The clamping rings 7 are formed in two parts and each have two turnbuckles 9, with which they are braced while exerting a radial pressure on the protective sieve 5.

Um eine axiale Bewegung der Spannringe 7 zur axialen Mitte der Zentrifugentrommel hin zu verhindern, sind über den Umfang des Schutzsiebes 5 verteilt mehrere Vorsprünge 8 in der Form von einwärts gebogenen Lappen vorgesehen, welche den zugehörigen Spannring 7 in Axialrichtung festlegen. Die Ausbildung dieser Lappen ist speziell in Figur 3 gezeigt. Die Lappen werden hergestellt, indem ein Rand des zylindrischen Schutzsiebes 5 mit zwei benachbarten Schlitzen bzw. Einschnitten versehen und der dazwischen angeordnete Abschnitte des Schutzsiebes um 180° nach innen gebogen wird, so dass sich der in Figur 3 dargestellte lappenförmige Vorsprung 8 ergibt. Die hierdurch gebildete Ausnehmung am Rand des Schutzsiebes 5 ist mit 10 bezeichnet. Mehrere dieser lappenförmigen Vorsprünge 8, die über den Umfang des Schutzsiebes 5 verteilt sind, bilden die entsprechende Axialfixierung des Spannringes 7.In order to prevent an axial movement of the clamping rings 7 toward the axial center of the centrifuge drum, a plurality of projections 8 in the form of inwardly bent tabs are provided distributed over the circumference of the protective screen 5, which define the associated clamping ring 7 in the axial direction. The training of these cloths is special in FIG. 3 shown. The flaps are made by providing one edge of the cylindrical protective screen 5 with two adjacent slots and bending the interposed portions of the protective screen 180 ° inwardly so that the in FIG. 3 shown tab-shaped projection 8 results. The recess formed thereby at the edge of the protective screen 5 is designated 10. Several of these tab-shaped projections 8, which extend over the circumference of the Protective strainer 5 are distributed, form the corresponding axial fixation of the clamping ring. 7

Claims (6)

Vorrichtung zum Halten einer Filterfolie oder eines Filtertuches, die bzw. das im installierten Zustand in einer Zentrifugentrommel auf einer Stützeinrichtung, insbesondere einem Stützsieb, aufliegt, mit einem Schutzsieb und mit einem Dichtelement mit Dichtlippen, zwischen denen im installierten Zustand sich die Ränder der Stützeinrichtung und der Filterfolie oder des Filtertuchs erstrecken, wobei im installierten Zustand das Schutzsieb die Filterfolie oder das Filtertuch und die Stützeinrichtung zwischen den Dichtlippen des Dichtelementes festklemmt, dadurch gekennzeichnet, dass die Vorrichtung ferner mindestens einen Spannring (7) aufweist, der im installierten Zustand das Schutzsieb (5) radial nach außen presst, und dass das Schutzsieb (5) auf seiner Innenseite mit mindestens einem Vorsprung (8) versehen ist, der den installierten Spannring (7) in Axialrichtung fixiert.Device for holding a filter foil or a filter cloth, which rests in the installed state in a centrifuge drum on a support means, in particular a support screen, with a protective screen and with a sealing element with sealing lips, between which in the installed state, the edges of the support means and the filter film or the filter cloth extend, wherein in the installed state the protective screen clamps the filter film or the filter cloth and the support means between the sealing lips of the sealing element, characterized in that the device further comprises at least one clamping ring (7) which in the installed state the protective screen ( 5) presses radially outwards, and that the protective screen (5) is provided on its inside with at least one projection (8) which fixes the installed clamping ring (7) in the axial direction. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass sie zwei Spannringe (7) für die beiden axialen Endbereiche des Schutzsiebes (5) besitzt und dass das Schutzsieb (5) mindestens zwei Vorsprünge (8) zur Axialfixierung der Spannringe (7) aufweist.Apparatus according to claim 1, characterized in that it has two clamping rings (7) for the two axial end portions of the protective screen (5) and that the Protective screen (5) has at least two projections (8) for axial fixation of the clamping rings (7). Vorrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass sie mindestens einen im axial mittleren Bereich des Schutzsiebes anordbaren Spannring besitzt.Device according to one of the preceding claims, characterized in that it has at least one can be arranged in the axially central region of the protective strainer clamping ring. Vorrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass der Vorsprung auf der Innenseite des Schutzsiebes von einer Strukturierung bzw. Profilierung desselben gebildet ist.Device according to one of the preceding claims, characterized in that the projection on the inside of the protective screen of a structuring or profiling thereof is formed. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der Vorsprung von einem Nocken gebildet ist.Device according to one of claims 1 to 3, characterized in that the projection is formed by a cam. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass der Vorsprung (8) von einem zurückgebogenen Randlappen des Schutzsiebes (5) gebildet ist.Device according to one of claims 1 to 3, characterized in that the projection (8) is formed by a bent-back edge tab of the protective screen (5).
EP10006128.2A 2009-06-13 2010-06-14 Device for holding a filter film or a filter cloth Active EP2253382B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102009024760A DE102009024760A1 (en) 2009-06-13 2009-06-13 Device for holding a filter foil or a filter cloth

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EP2253382A2 true EP2253382A2 (en) 2010-11-24
EP2253382A8 EP2253382A8 (en) 2011-03-02
EP2253382A3 EP2253382A3 (en) 2013-12-25
EP2253382B1 EP2253382B1 (en) 2016-12-14

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014106669A1 (en) * 2013-01-07 2014-07-10 Clear Edge-Germany Gmbh Filter cloth retention
DE102014119605A1 (en) * 2014-12-23 2016-06-23 Andritz Kmpt Gmbh filter centrifuge
CN106694244A (en) * 2017-02-28 2017-05-24 蚌埠市兴利离心机制造有限公司 Rotary drum filter cloth support hoop structure for vertical centrifugal machine

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015005609A1 (en) 2015-04-30 2016-11-03 Guntram Krettek Centrifuge drum and filter pack for installation in a centrifuge drum
DE102015015014A1 (en) 2015-11-19 2017-05-24 Guntram Krettek Centrifuge drum with attachment device and toggle lock ring
DE102018007294A1 (en) 2018-09-14 2020-03-19 Guntram Krettek Process for fixing a sheet and filter device produced therewith

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3916383C2 (en) 1989-05-19 1999-01-07 Guntram Krettek Device for holding filter foils or filter cloths

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1946500A (en) * 1933-01-28 1934-02-13 Western States Machine Co Basket lining for centrifugals
JPH10180144A (en) * 1996-12-26 1998-07-07 Mitsubishi Kakoki Kaisha Ltd Fastener for filter medium of centrifugal filter

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3916383C2 (en) 1989-05-19 1999-01-07 Guntram Krettek Device for holding filter foils or filter cloths

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014106669A1 (en) * 2013-01-07 2014-07-10 Clear Edge-Germany Gmbh Filter cloth retention
DE102014119605A1 (en) * 2014-12-23 2016-06-23 Andritz Kmpt Gmbh filter centrifuge
CN106694244A (en) * 2017-02-28 2017-05-24 蚌埠市兴利离心机制造有限公司 Rotary drum filter cloth support hoop structure for vertical centrifugal machine

Also Published As

Publication number Publication date
DE102009024760A1 (en) 2010-12-16
EP2253382A8 (en) 2011-03-02
EP2253382B1 (en) 2016-12-14
EP2253382A3 (en) 2013-12-25

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