EP0455964B1 - Centrifuge - Google Patents

Centrifuge Download PDF

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Publication number
EP0455964B1
EP0455964B1 EP91104291A EP91104291A EP0455964B1 EP 0455964 B1 EP0455964 B1 EP 0455964B1 EP 91104291 A EP91104291 A EP 91104291A EP 91104291 A EP91104291 A EP 91104291A EP 0455964 B1 EP0455964 B1 EP 0455964B1
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EP
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Prior art keywords
screen
centrifuge
basket
funnel
protective screen
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EP91104291A
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German (de)
French (fr)
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EP0455964A1 (en
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Günter Dipl.-Ing. Trojan
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Hein Lehmann Trenn und Fordertechnik GmbH
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Hein Lehmann Trenn und Fordertechnik GmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B3/00—Centrifuges with rotary bowls in which solid particles or bodies become separated by centrifugal force and simultaneous sifting or filtering

Definitions

  • the invention relates to a sieve centrifuge, in particular a sugar centrifuge with an upwardly widening, driven, conical centrifuge basket, in the area of smaller diameter of which the crystal suspension to be centrifuged is continuously added, in which area an upwardly conically expanding protective sieve of smaller size than the centrifuge basket is coaxial is attached, which rotates with the centrifuge basket and has sieve openings that do not let through coarse particles that could damage the centrifuge basket or a working sieve lying on the centrifuge basket.
  • a screen centrifuge is known in which an inner screen part is provided which is firmly connected to the outer screen basket.
  • This inner sieve part is composed of several wing-shaped parts that form sieve pockets. Coarse particles are not kept away from the sieve basket by these sieve pockets.
  • the object of the invention is to improve a centrifuge of the type mentioned in such a way that the mass on the working sieve is uniformly wetted with covering liquid and transported safely, that the protective device is also less stressed and thus has a longer service life.
  • the first part of the object is achieved in that such a wide annular space is created between the centrifuge basket or working sieve and protective sieve that nozzles can be attached in this annular space and spray the covering liquid directly onto the working sieve or onto the solid layer.
  • covering liquid or covering water can be brought directly onto the solid layer on the working screen in the intermediate space, whereby the quality and the sliding of the solid on the working screen are significantly improved and evened out.
  • a good washing effect is achieved because the uniform distribution of the cover liquid is not hindered by the protective sieve.
  • the protective screen no longer needs to be built so easily due to the greater distance from the working screen, so that it is more wear-resistant.
  • the coarse particles sliding over the protective sieve are advantageously directed upwards over the centrifuge basket into the sugar chamber by a rotating funnel which has no sieve openings.
  • the protective sieve and funnel are advantageously not formed as a unit, but as two independently rotating components, the funnel rotating more slowly than the protective sieve and with its lower opening the upper edge of the protective sieve.
  • a reliable transfer of the coarse particles from the protective screen to the funnel is achieved when the protective screen protrudes a few centimeters into the funnel.
  • the protective screen needs a high speed so that high acceleration forces arise and the suspension flows completely through the relatively small protective screen openings and does not get onto the funnel, which is only supposed to transport the coarse parts that are dangerous for the working screen.
  • a centrifuge particularly for the production of sugar, has a conically expanding basket 1, the axis of rotation of which is perpendicular and which is driven by a motor 2.
  • the basket 1 On its inside, the basket 1 carries a conical working sieve 3, the surface of which is parallel to the wall of the basket 1.
  • a truncated cone-shaped protective sieve 4 coaxially attached, which extends upwards and whose height is less than half that of the working sieve 3.
  • the diameter of the protective sieve 4 is less than half the diameter of the working sieve 3 at the same height, so that between the protective sieve 4 and the working sieve 3 there is an annular space 5, the width of which is so large that tubes 6 can extend into this intermediate space, the nozzles 7 of which deliver deck water onto the working sieve 3.
  • a truncated cone-shaped funnel 8 which widens upwards, is mounted coaxially and rotatably, which is driven by a separate drive 9a.
  • the lower edge 8a of the funnel 8 projects beyond the upper edge 4a of the protective screen, the diameter of the edge 8a being chosen only slightly larger than the diameter of the edge 4a.
  • the protective screen 4 can transfer coarse parts to the funnel 8, which has no openings and transfers the coarse parts with its upper edge 8b to a channel 9 which is arranged in a circular and coaxial manner around the upper edge of the funnel 8 in a rotationally fixed manner.
  • the speed of the transport funnel 8 is always lower than that of the basket 1 or the work screen 3.
  • the mass or suspension to be centrifuged is fed via a coaxial filling tube 10, which projects with its lower end into the protective screen 4, so that the mass reaches the bottom of the basket 1 and from there to the inner wall of the protective screen 4. Except for the coarse constituents, the mass passes through the protective sieve 4 to the lower area of the working sieve 3, where the more liquid constituents reach the basket wall relatively early through the working sieve 3 and the remaining constituents flow upwards and are wetted by the nozzles 7.
  • the coarse constituents reach the funnel 8 from the upper edge of the protective sieve 4, which releases these constituents upwards to the channel 9.
  • the funnel 8 represents approximately an extension of the protective screen 4 in terms of arrangement and dimensions, but is a part separated from the protective screen 4 at different speeds.
  • the funnel 8 can also be fastened to the protective screen 4, in particular in one piece with it, so that the wall of the protective screen 4 merges with the wall of the funnel 8 and differs from that of the protective screen in that it is in the area of Funnel has no openings.
  • the funnel 8 is not driven separately, but rotates with the protective screen at the same speed.
  • a tube 11 can be laterally displaced into the protective screen 4 and arranged axially parallel to the feed pipe 10, through the nozzles 12 of which steam is applied to the inner wall of the protective screen 4 and the floor. Can also go through a pipe 14 ( Figure 2) water to be abandoned.
  • a bell 13 widening downward is coaxially fastened to the underside of the funnel 8, the upper edge of which is equal to or lower than the upper edge 4a of the protective screen 4.
  • the bell 13 gives up the mass passing through the protective screen 4 the lower edge of the basket 1 or the working screen 3.
  • the bell 13 has no sieve openings and has the shape of a hollow truncated cone.

Abstract

The invention relates to a centrifuge with an upwardly widening, driven, conical centrifuge basket (1) into whose region with a smaller diameter the suspension to be centrifuged is continuously charged, an upwardly conically widening protective screen (4) which is smaller in size than the centrifuge basket (4) being coaxially attached in this region, rotating with the centrifuge basket (1) and having screen openings which do not allow coarse particles which could damage the centrifuge basket (1) or a working screen (3) lying on the centrifuge basket (1) to pass through, there being between the centrifuge basket (1) or working screen (3) and protective screen (4) such a wide annular space that in this annular space nozzles (7) can be mounted which apply liquid, in particular covering water, onto the centrifuge basket (1) or the working screen (3). <IMAGE>

Description

Die Erfindung betrifft eine Siebzentrifuge, insbesondere Zuckerzentrifuge mit einem sich nach oben erweiternden, angetriebenen, konischen Zentrifugenkorb, in dessen Bereich kleineren Durchmessers die zu zentrifugierende Kristallsuspension kontinuierlich aufgegeben wird, wobei in diesem Bereich ein sich nach oben konisch erweiterndes Schutzsieb geringerer Größe als der Zentrifugenkorb koaxial befestigt ist, das mit dem Zentrifugenkorb umläuft und Sieböffnungen aufweist, die keine Grobpartikel hindurchlassen, welche den Zentrifugenkorb bzw. ein auf dem Zentrifugenkorb liegenden Arbeitssieb beschädigen könnten.The invention relates to a sieve centrifuge, in particular a sugar centrifuge with an upwardly widening, driven, conical centrifuge basket, in the area of smaller diameter of which the crystal suspension to be centrifuged is continuously added, in which area an upwardly conically expanding protective sieve of smaller size than the centrifuge basket is coaxial is attached, which rotates with the centrifuge basket and has sieve openings that do not let through coarse particles that could damage the centrifuge basket or a working sieve lying on the centrifuge basket.

Aus dem deutschen Gebrauchsmuster DE-U-19 35 839 ist es bekannt, über dem Arbeitssieb eines Zentrifugenkorbes ein Schutzsieb in einem nur so großen Abstand zu befestigen, daß die durch das Schutzsieb auf das Arbeitssieb gelangende Kristallsuspension auf dem Arbeitssieb entlangfließen kann. Das zum Reinigen des Feststoffs erforderliche Deckwasser gelangt über Düsen fein verteilt auf das Schutzsieb. Auf der Schutzsieboberfläche wird es beschleunigt und durch die Schutzsieböffnungen auf den weiter außen auf dem Arbeitssieb liegenden Feststoff geleitet. Jede Schutzsieböffnung stellt quasi eine separate Düse dar, die sich im Fliehkraftfeld bewegte. Aus einer rotierenden Düse versprühte Wassertropfen werden unter dem Einfluß der Fliehkraft kurz nach dem Austritt zu wenigen dicken Tropfen zusammengeführt. Deshalb, und weil sich die Schutzsieböffnungen in Umfangsrichtung nicht relativ zum Feststoff bewegen, werden nur einzelne Bereiche des Feststoffs, nicht aber die gesamte Oberfläche der Feststoffschicht von den Flüssigkeitstropfen getroffen. Das Ziel, beim Zentrifugieren von Zuckerkristallsuspensionen die Kristalle vom anhaftenden Sirup zu befreien, wurde infolgedessen nur unvollkommen erreicht. Mit einem Schutzsieb war nur eine Zentrifuge zu betreiben, wenn keine besonders hohen Ansprüche an die Reinheit des Zuckers gestellt wurden, z.B. wenn Nachproduktzucker geschleudert wurde, nicht aber wenn B-Zucker, A-Zucker oder Affinationszucker zu schleudern waren.From the German utility model DE-U-19 35 839 it is known to fasten a protective sieve over the working sieve of a centrifuge basket at such a distance that the crystal suspension passing through the protective sieve on the working sieve can flow along the working sieve. The deck water required to clean the solid is distributed to the protective screen through nozzles. It is accelerated on the protective screen surface and passed through the protective screen openings to the solid material lying outside on the working screen. Each screen opening is a separate one Nozzle that moved in the centrifugal field. Drops of water sprayed from a rotating nozzle are brought together under the influence of centrifugal force to form a few thick drops shortly after the outlet. Therefore, and because the protective screen openings do not move in the circumferential direction relative to the solid, only individual areas of the solid, but not the entire surface of the solid layer, are hit by the liquid drops. As a result, the goal of removing the adhering syrup from the crystals when centrifuging sugar crystal suspensions was only incompletely achieved. A centrifuge could only be operated with a protective sieve if no particularly high demands were made on the purity of the sugar, for example if by-product sugar was spun, but not if B sugar, A sugar or affection sugar had to be spun.

Ein weiterer Nachteil eines Schutzsiebes nach Gebrauchsmuster 1935839 war, daß es zu Stauungen im Raum zwischen Arbeitssieb und Schutzsieb kommt. Die Ursache hierfür liegt im Fehlen des Schubes, den die nachfließende Kristallsuspension in kontinuierlichen Zuckerzentrifugen üblicherweise von unten her auf die auf dem Arbeitssieb liegende Feststoffschicht ausübt. Wird die Kristallsuspension nicht vom ungelochten untersten Korbbereich aus zugeführt, sondern auf ein Schutzsieb alter Bauart gegeben, erreicht sie die Arbeitssiebfläche nicht in ihrer Gesamtheit an der Grenzlinie zwischen Arbeitssieb und ungelochtem Bereich, sondern auf einer breiten Zone des Arbeitssiebes verteilt. Ein Schub von unten kann sich nicht entwickeln.Another disadvantage of a protective screen according to utility model 1935839 was that there is congestion in the space between the working screen and the protective screen. The reason for this lies in the lack of thrust that the flowing crystal suspension usually exerts in continuous sugar centrifuges from below onto the solid layer lying on the working sieve. If the crystal suspension is not fed in from the bottom of the unperforated bottom basket area, but placed on a protective screen of the old design, it does not reach the working screen surface in its entirety on the boundary line between the working screen and the unperforated area, but rather distributed over a wide zone of the working screen. A push from below cannot develop.

Ein weiterer Nachteil eines Schutzsiebes nach Gebrauchsmuster 1935839 ist die hohe Umfangsgeschwindigkeit des Schutzsiebes im oberen Bereich. Zurückgehaltene Grobparikel drücken hier besonders stark auf das Schutzieb, also dort, wo es nur auf den Weitertransport ankommt und eine niedrige Drehzahl ausgereicht hätte. Die Kristallsuspension ist meist schon im unteren Siebviertel durch das Schutzsieb gedrungen. Im oberen Bereich wird es deshalb unnötig stark beansprucht.Another disadvantage of a protective screen according to utility model 1935839 is the high peripheral speed of the protective screen in the upper area. Retained coarse particles press particularly hard on this Protective sieve, i.e. where only further transport is important and a low speed would have been sufficient. The crystal suspension has mostly penetrated the protective sieve in the lower quarter of the sieve. It is therefore unnecessarily heavily used in the upper area.

Aus der DE-A-29 30 312 ist eine Siebzentrifuge bekannt, bei der ein inneres Siebteil vorgesehen ist, das mit dem äußeren Siebkorb fest verbunden ist. Dieses innere Siebteil ist aus mehreren flügelförmigen Teilen zusammengesetzt, die Siebtaschen bilden. Grobteile werden durch diese Siebtaschen vom Siebkorb nicht abgehalten.From DE-A-29 30 312 a screen centrifuge is known in which an inner screen part is provided which is firmly connected to the outer screen basket. This inner sieve part is composed of several wing-shaped parts that form sieve pockets. Coarse particles are not kept away from the sieve basket by these sieve pockets.

Aufgabe der Erfindung ist es, eine Zentrifuge der eingangs genannten Art so zu verbessern, daß die auf dem Arbeitssieb befindliche Masse gleichmäßig mit Deckflüssigkeit benetzt und sicher transportiert wird, daß ferner die Schutzeinrichtung weniger belastet wird und dadurch eine längere Lebensdauer erhält.The object of the invention is to improve a centrifuge of the type mentioned in such a way that the mass on the working sieve is uniformly wetted with covering liquid and transported safely, that the protective device is also less stressed and thus has a longer service life.

Der erste Teil der Aufgabe wird erfindungsgemäß dadurch gelöst, daß zwischen Zentrifugenkorb bzw. Arbeitssieb und Schutzsieb ein solch breiter Ringraum angelegt wird, daß in diesem Ringraum Düsen anbringbar sind, die Deckflüssigkeit unmittelbar auf das Arbeitssieb bzw. auf die Feststoffschicht sprühen.The first part of the object is achieved in that such a wide annular space is created between the centrifuge basket or working sieve and protective sieve that nozzles can be attached in this annular space and spray the covering liquid directly onto the working sieve or onto the solid layer.

Aufgrund des großen Abstandes zwischen Schutzsieb und Arbeitssieb kann in dem Zwischenraum Deckflüssigkeit bzw. Deckwasser direkt auf die auf dem Arbeitssieb befindliche Feststoffschicht gebracht werden, wodurch die Qualität und das Gleiten des auf dem Arbeitssieb befindlichen Feststoffes wesentlich verbessert und vergleichmäßigt werden. Es wird eine gute Waschwirkung erreicht, weil die gleichmäßige Verteilung der Deckflüssigkeit nicht durch das Schutzsieb behindert wird. Ferner braucht das Schutzsieb aufgrund des größeren Abstandes zum Arbeitssieb nicht mehr so leicht gebaut zu werden, so daß es verschleißfester ist.Due to the large distance between the protective screen and the working screen, covering liquid or covering water can be brought directly onto the solid layer on the working screen in the intermediate space, whereby the quality and the sliding of the solid on the working screen are significantly improved and evened out. A good washing effect is achieved because the uniform distribution of the cover liquid is not hindered by the protective sieve. Furthermore, the protective screen no longer needs to be built so easily due to the greater distance from the working screen, so that it is more wear-resistant.

Stauungen auf dem Arbeitssieb werden dadurch verhindert, daß die Kristallsuspension hinter dem Schutzsieb gesammelt nach unten geführt wird. Die Suspension wird dort beschleunigt, fließt nach oben und übt mit ihrer gesamten Masse einen Schub aus auf die schon auf dem Arbeitssieb befindliche Suspension und damit auf den weiter oben auf dem Arbeitssieb liegenden Feststoff. Damit ist ein stetiger Transport auf dem Arbeitssieb gewährleistet.Congestion on the working sieve is prevented by the crystal suspension being collected downward behind the protective sieve. The suspension is accelerated there, flows upwards and, with its entire mass, exerts a thrust on the suspension already on the working sieve and thus on the solids lying further up on the working sieve. This ensures constant transport on the working sieve.

Die über das Schtutzsieb hinweggleitenden Grobpartikel werden vorteilhaft durch einen drehenden Trichter, der keine Sieböffnungen aufweist, nach oben über den Zentrifugenkorbrand hinweg in den Zuckerraum geleitet.The coarse particles sliding over the protective sieve are advantageously directed upwards over the centrifuge basket into the sugar chamber by a rotating funnel which has no sieve openings.

Um zu verhindern, daß die Grobpartikel zu stark auf den mitdrehenden Trichter drücken, werden Schutzsieb und Trichter vorteilhaft nicht als Einheit ausgebildet, sondern als zwei unabhängig von einander drehende Bauteile, wobei der Trichter langsamer dreht als das Schutzsieb und mit seiner unteren Öffnung den oberen Rand des Schutzsiebes umschließt. Eine sichere Übergabe der Grobpartikel vom Schutzsieb zum Trichter wird dann erreicht, wenn das Schutzsieb mit seinem oberen Rand einige Zentimeter in den Trichter hineinragt. Das Schutzsieb braucht eine hohe Drehzahl, damit große Beschleunigungskräfte entstehen und die Suspension vollständig durch die relativ kleinen Schutzsieböffnungen abfließt und nicht etwa auf den Trichter gerät, der nur die für das Arbeitssieb gefährlichen groben Teile transportieren soll.In order to prevent the coarse particles from pressing too hard on the rotating funnel, the protective sieve and funnel are advantageously not formed as a unit, but as two independently rotating components, the funnel rotating more slowly than the protective sieve and with its lower opening the upper edge of the protective sieve. A reliable transfer of the coarse particles from the protective screen to the funnel is achieved when the protective screen protrudes a few centimeters into the funnel. The protective screen needs a high speed so that high acceleration forces arise and the suspension flows completely through the relatively small protective screen openings and does not get onto the funnel, which is only supposed to transport the coarse parts that are dangerous for the working screen.

Eine besonders gleichmäßig über den Umfang verteilte Aufgabe der durch das Schutzsieb gelangenden Kristallsuspension auf den untersten Rand des Korbes bzw. des Arbeitssiebes wird dann erreicht, wenn an der Unterseite des Trichters eine sich nach unten erweiternde Glocke koaxial befestigt ist, deren oberer Rand gleich hoch oder niedriger ist als der obere Rand des Schutzsiebes, wobei die Glocke die durch das Schutzsieb gelangende Suspension auf den unteren Rand des Korbes bzw. des Arbeitssiebes abgibt. Die Glocke rotiert damit mit derselben Geschwindigkeit wie der Trichter und somit langsamer als der Korb. Dies führt zu einer gleichmäßigen Verteilung der Kristallsuspension auf dem Sieb. Ausführungsbeispiele der Erfindung sind in den Zeichnungen in senkrechten Axialschnitten dargestellt und werden im folgenden näher beschrieben. Es zeigen

Figur 1
ein erstes Ausführungsbeispiel und
Figur 2
ein zweites Ausführungsbeispiel.
A particularly evenly distributed task over the circumference of the crystal suspension passing through the protective sieve onto the bottom edge of the basket or of the working sieve is achieved if a bell that widens downwards is coaxially attached to the underside of the funnel, the upper edge of which is of the same height or is lower than the upper edge of the protective sieve, the bell being the releases suspension through the protective screen onto the lower edge of the basket or work screen. The bell rotates at the same speed as the funnel and therefore slower than the basket. This leads to an even distribution of the crystal suspension on the sieve. Embodiments of the invention are shown in the drawings in vertical axial sections and are described in more detail below. Show it
Figure 1
a first embodiment and
Figure 2
a second embodiment.

Eine Zentrifuge, insbesondere zur Herstellung von Zucker weist einen konisch sich nach oben erweiternden Korb 1 auf, dessen Drehachse senkrecht steht und der durch einen Motor 2 angetrieben ist. Auf seiner Innenseite trägt der Korb 1 ein konisches Arbeitssieb 3, dessen Fläche parallel zur Wandung des Korbes 1 ist.A centrifuge, particularly for the production of sugar, has a conically expanding basket 1, the axis of rotation of which is perpendicular and which is driven by a motor 2. On its inside, the basket 1 carries a conical working sieve 3, the surface of which is parallel to the wall of the basket 1.

Auf dem Boden des Korbes 1 befindet sich ein kegelstumpfförmiges Schutzsieb 4 koaxial befestigt, das sich nach oben hin erweitert und dessen Höhe weniger als halb so groß ist wie die des Arbeitssiebes 3. Der Durchmesser des Schutzsiebes 4 ist weniger als halb so groß wie der Durchmesser des Arbeitssiebes 3 in der jeweils selben Höhe, so daß zwischen Schutzsieb 4 und Arbeitssieb 3 ein Ringraum 5 besteht, dessen Breite so groß ist, daß Rohre 6 in diesen Zwischenraum hineinreichen könne, deren Düsen 7 Deckwasser auf das Arbeitssieb 3 abgeben.On the bottom of the basket 1 is a truncated cone-shaped protective sieve 4 coaxially attached, which extends upwards and whose height is less than half that of the working sieve 3. The diameter of the protective sieve 4 is less than half the diameter of the working sieve 3 at the same height, so that between the protective sieve 4 and the working sieve 3 there is an annular space 5, the width of which is so large that tubes 6 can extend into this intermediate space, the nozzles 7 of which deliver deck water onto the working sieve 3.

Oberhalb des Schutzsiebes 4 ist ein kegelstumpfförmiger sich nach oben hin erweiternder Trichter 8 koaxial und drehbar gelagert, der durch einen separaten Antrieb 9a angetrieben ist. Der untere Rand 8a des Trichters 8 ragt außen über den oberen Rand 4a des Schutzsiebes hinweg, wobei der Durchmesser des Randes 8a nur wenig größer gewählt ist als der Durchmesser des Randes 4a. Hierdurch kann das Schutzsieb 4 Grobteile auf den Trichter 8 übergeben, der keine Öffnungen aufweist und die Grobteile mit seinem oberen Rand 8b einer Rinne 9 übergibt, die kreisförmig und koaxial um den oberen Rand des Trichters 8 drehfest angeordnet ist. Die Drehzahl des Transporttrichters 8 ist stets geringer als die des Korbes 1 bzw. des Arbeitssiebes 3.Above the protective screen 4, a truncated cone-shaped funnel 8, which widens upwards, is mounted coaxially and rotatably, which is driven by a separate drive 9a. The lower edge 8a of the funnel 8 projects beyond the upper edge 4a of the protective screen, the diameter of the edge 8a being chosen only slightly larger than the diameter of the edge 4a. In this way, the protective screen 4 can transfer coarse parts to the funnel 8, which has no openings and transfers the coarse parts with its upper edge 8b to a channel 9 which is arranged in a circular and coaxial manner around the upper edge of the funnel 8 in a rotationally fixed manner. The The speed of the transport funnel 8 is always lower than that of the basket 1 or the work screen 3.

Die zu zentrifugierende Masse bzw. Suspension wird über ein koaxiales Füllrohr 10 aufgegeben, das mit seinem unteren Ende bis in das Schutzsieb 4 hineinragt, so daß die Masse auf den Boden des Korbes 1 gelangt und von dort zur Innenwand des Schutzsiebes 4. Bis auf die groben Bestandteile gelangt die Masse durch das Schutzsieb 4 zum unteren Bereich des Arbeitssiebes 3, wo die flüssigeren Bestandteile verhältnismäßig früh durch das Arbeitssieb 3 nach außen auf die Korbwand gelangen und die übrigen Bestandteile weiter nach oben fließen und durch die Düsen 7 benetzt werden.The mass or suspension to be centrifuged is fed via a coaxial filling tube 10, which projects with its lower end into the protective screen 4, so that the mass reaches the bottom of the basket 1 and from there to the inner wall of the protective screen 4. Except for the coarse constituents, the mass passes through the protective sieve 4 to the lower area of the working sieve 3, where the more liquid constituents reach the basket wall relatively early through the working sieve 3 and the remaining constituents flow upwards and are wetted by the nozzles 7.

Die groben Bestandteile gelangen vom oberen Rand des Schutzsiebes 4 auf den Trichter 8, der diese Bestandteile nach oben hin zur Rinne 9 abgibt.The coarse constituents reach the funnel 8 from the upper edge of the protective sieve 4, which releases these constituents upwards to the channel 9.

Im in Figur 1 dargestellten Ausführungsbeispiel stellt der Trichter 8 in Anordnung und Abmessung etwa eine Verlängerung des Schutzsiebes 4 dar, ist aber ein vom Schutzsieb 4 getrenntes Teil mit unterschiedlicher Drehzahl. In einer nicht dargestellten Alternative kann aber auch der Trichter 8 am Schutzsieb 4 befestigt, insbesondere einstückig mit diesem sein, so daß die Wand des Schutzsiebes 4 in die Wand des Trichters 8 übergeht und sich von der des Schutzsiebes dadurch unterscheidet, daß sie im Bereich des Trichters keine Öffnungen besitzt. In diesem Ausführungsbeispiel ist der Trichter 8 nicht separat angetrieben, sondern dreht sich mit dem Schutzsieb mit gleicher Drehzahl.In the exemplary embodiment shown in FIG. 1, the funnel 8 represents approximately an extension of the protective screen 4 in terms of arrangement and dimensions, but is a part separated from the protective screen 4 at different speeds. In an alternative, not shown, the funnel 8 can also be fastened to the protective screen 4, in particular in one piece with it, so that the wall of the protective screen 4 merges with the wall of the funnel 8 and differs from that of the protective screen in that it is in the area of Funnel has no openings. In this embodiment, the funnel 8 is not driven separately, but rotates with the protective screen at the same speed.

In das Schutzsieb 4 kann ein Rohr 11 seitlich verschoben und achsparallel zum Aufgaberohr 10 angeordnet sein, durch dessen Düsen 12 Dampf auf die Innenwand des Schutzsiebes 4 und den Boden aufgegeben wird. Auch kann dort durch ein Rohr 14 (Figur 2) Wasser aufgegeben werden.A tube 11 can be laterally displaced into the protective screen 4 and arranged axially parallel to the feed pipe 10, through the nozzles 12 of which steam is applied to the inner wall of the protective screen 4 and the floor. Can also go through a pipe 14 (Figure 2) water to be abandoned.

Im Ausführungsbeispiel nach Figur 2 ist an der Unterseite des Trichters 8 eine sich nach unten erweiternde Glocke 13 koaxial befestigt, deren oberer Rand gleich oder niedriger ist als der obere Rand 4a des Schutzsiebes 4. Die Glocke 13 gibt die durch das Schutzsieb 4 gelangende Masse auf den unteren Rand des Korbes 1 bzw. des Arbeitssiebes 3 ab.In the exemplary embodiment according to FIG. 2, a bell 13 widening downward is coaxially fastened to the underside of the funnel 8, the upper edge of which is equal to or lower than the upper edge 4a of the protective screen 4. The bell 13 gives up the mass passing through the protective screen 4 the lower edge of the basket 1 or the working screen 3.

Die Glocke 13 weist keine Sieböffnungen auf und hat die Form eines hohlen Kegelstumpfes.The bell 13 has no sieve openings and has the shape of a hollow truncated cone.

Claims (7)

  1. A centrifuge having an upwardly widening driven conical centrifuge basket (1), to whose zone of minor diameter the suspension to be centrifuged is continuously fed, an upwardly conically widening protective screen (4) of smaller size than the centrifuge basket (1) being coaxially attached in said zone and rotating with the centrifuge basket (1) and having screen apertures passing through no coarse particles which might damage the centrifuge basket (1) or a working screen (3) disposed on the centrifuge basket, characterized in that between the centrifuge basket (1) and the working screen (3) and protective screen (4) there is an annular space (5) wide enough for nozzles (7) to be disposed in said annular space (5) which apply liquid, more particularly washwater, to the centrifuge basket and the working screen, while disposed coaxially above the protective screen is a conical funnel (8) which has no screen apertures and whose zone of minor diameter extends as far as the protective screen (4).
  2. A centrifuge according to claim 1, characterized in that the funnel (8) is formed by an upper zone of the protective screen (4) which has no apertures.
  3. A centrifuge according to claim 1, characterized in that the funnel (8) is a member which is separated from the protective screen (4) and rotates at a lower speed than the protective screen (4).
  4. A centrifuge according to claim 1, characterized in that coaxially attached to the underside of the funnel (8) is a downwardly widening bell-shaped member (13) whose upper edge (13a) is level with or lower than the upper edge (4a) of the protective screen (4), the bell-shaped member (13) delivering the substance passing through the protective screen (4) to the lower edge of the basket (1) and the working screen (3).
  5. A centrifuge according to claims 3 or 4, characterized in that the protective screen (4) extends by its upper edge into the funnel (8).
  6. A centrifuge according to one of the preceding claims, characterized in that the upper edge (8b) of the funnel (8) extends upwards beyond the upper edge of the centrifuge basket (1).
  7. A centrifuge according to one of the preceding claims, characterized in that the funnel (8) is driven by a separate drive (9a).
EP91104291A 1990-05-08 1991-03-20 Centrifuge Expired - Lifetime EP0455964B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4014664 1990-05-08
DE4014664A DE4014664A1 (en) 1990-05-08 1990-05-08 CENTRIFUGE

Publications (2)

Publication Number Publication Date
EP0455964A1 EP0455964A1 (en) 1991-11-13
EP0455964B1 true EP0455964B1 (en) 1994-06-01

Family

ID=6405911

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91104291A Expired - Lifetime EP0455964B1 (en) 1990-05-08 1991-03-20 Centrifuge

Country Status (4)

Country Link
EP (1) EP0455964B1 (en)
AT (1) ATE106280T1 (en)
DE (2) DE4014664A1 (en)
ES (1) ES2054386T3 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5286299A (en) * 1991-12-13 1994-02-15 Silver Engineering Works, Inc. Apparatus and method for providing reduced crystal damage in a sugar centrifugal
DE19729036B4 (en) * 1997-07-08 2005-08-11 Hein, Lehmann Trenn- und Fördertechnik GmbH Screen plate with tensioning aid
US20100251561A1 (en) * 2007-09-19 2010-10-07 Holmes George A Centrifugal pellet dryer and dewatering assembly
DE202014010380U1 (en) 2014-06-27 2015-06-03 Hein, Lehmann Gmbh spin basket

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1444790A (en) * 1965-05-18 1966-07-08 Fives Lille Cail Feeding device for continuously running centrifugal wringer
FR2274361A1 (en) * 1974-06-17 1976-01-09 Fives Cail Babcock Centrifugal drier with steam injector feed system - for massecuite in sugar refineries
DE2462922C3 (en) * 1974-12-18 1981-12-03 Krauss-Maffei AG, 8000 München Impact ring centrifuge
DE2841725A1 (en) * 1978-09-25 1980-04-10 Hein Lehmann Ag Continuous centrifuge charging device - with slotted support cone for accelerator cone concentric to accelerator cup
DE2930312C2 (en) * 1979-07-26 1985-10-10 Krauss-Maffei AG, 8000 München Sieve centrifuge

Also Published As

Publication number Publication date
DE59101762D1 (en) 1994-07-07
ATE106280T1 (en) 1994-06-15
DE4014664A1 (en) 1991-11-14
ES2054386T3 (en) 1994-08-01
EP0455964A1 (en) 1991-11-13

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