EP0068095B1 - Pusher centrifuge - Google Patents

Pusher centrifuge Download PDF

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Publication number
EP0068095B1
EP0068095B1 EP82103444A EP82103444A EP0068095B1 EP 0068095 B1 EP0068095 B1 EP 0068095B1 EP 82103444 A EP82103444 A EP 82103444A EP 82103444 A EP82103444 A EP 82103444A EP 0068095 B1 EP0068095 B1 EP 0068095B1
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EP
European Patent Office
Prior art keywords
floor member
sieve drum
pusher
sieve
pusher floor
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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.)
Expired
Application number
EP82103444A
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German (de)
French (fr)
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EP0068095A2 (en
EP0068095A3 (en
Inventor
Bruno Mülhaupt
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Sulzer Escher Wyss AG
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Sulzer Escher Wyss AG
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Publication of EP0068095A2 publication Critical patent/EP0068095A2/en
Publication of EP0068095A3 publication Critical patent/EP0068095A3/en
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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
    • B04B3/02—Centrifuges with rotary bowls in which solid particles or bodies become separated by centrifugal force and simultaneous sifting or filtering discharging solid particles from the bowl by means coaxial with the bowl axis and moving to and fro, i.e. push-type centrifuges

Definitions

  • the application relates to a pusher centrifuge with at least one sieve drum rotatably mounted in a housing and with a disk-shaped sliding floor arranged coaxially in the sieve drum, which is rotatable and can be moved back and forth in the longitudinal direction between turning points relative to the sieve drum, and for coating one Longitudinal section of the filter surface of the sieve drum and for pushing a filter cake along the sieve drum in the direction towards discharge openings for the filter cake is provided, the turning points preferably being on both sides of the imaginary center line of the sieve drum, with a coaxially arranged to feed the suspension to be separated in the sieve drum
  • the feed tube is provided, and the discharge openings for the filter cake are provided on both sides of the sieve drum.
  • Such push centrifuges are known for example from DE-AS 1 065333 and from DE-AS 1 114149.
  • the general advantages of the pusher centrifuge are associated with the disadvantage that the centrifuge can only be fed with relatively high solids concentrations. If the inlet concentration decreases, there is a risk of washing up.
  • Flooding is the operating state when the drainage time between two strokes of the moving floor is not sufficient to drain the swamp in front of the moving floor to such an extent that the cake can be transported.
  • the sump is the longitudinal section of the screening drum that is swept by the moving floor. If the drainage is not sufficient, there is still a suspension in the swamp when the moving floor returns, which cannot be moved as a cake, which leads to the above-mentioned flooding.
  • centrifuges have a separate feed line for each side with respect to the moving floor, one of which opens on one side and the second on the other side of the moving floor, so that the sump area on both sides of the moving floor is under constant supply of the suspension and can come to water.
  • the invention has for its object to provide a pusher centrifuge of the type specified, with which thin suspensions can be processed.
  • the outflow opening of the feed pipe points radially outwards, lies in the middle between the two turning points of the push floor, and in that the push floor has a central opening which clears a passage for the feed pipe through the push floor, so that the outflow opening of the feed pipe is alternately located on one or the other side of the moving floor when the pushing floor is pushed back and forth relative to the outflow opening.
  • the push centrifuge is provided with a washing device for washing the filter cake on the sieve surface of the sieve drum.
  • the push centrifuge as a two-stage centrifuge.
  • a screen drum 2 is rotatably mounted in a housing 1 of the pusher centrifuge.
  • a disc-shaped sliding floor 4 is arranged, which is rotatable and can be moved back and forth in the longitudinal direction between two turning points, 5 in FIG. 1 and 6 in FIG. 2, relative to the screening drum 2.
  • the push floor 4 sweeps a longitudinal section between the turning points 5 and 6 of the filter surface of the screening drum 2 and in each case moves a filter cake along the screening drum 2 in the direction of discharge openings 7, which are provided for the filter cake to be let out.
  • the sump which is designated here by 28.
  • the turning points 5 and 6 are preferably on both sides of the imaginary center line 3, in FIG. 1, the sieve drum 2, the push floor 4 thus oscillates in a longitudinal section of the sieve drum about this imaginary center line 3.
  • a Provided feed tube 8 which is arranged coaxially with the sieve drum.
  • An outflow opening 9 of the feed pipe 8 is located in the middle between the two turning points 5 and 6 of the moving floor 4 and points the flow of the suspension radially outwards, ie. H. in the radial direction to the sieve surface of the sieve drum 2.
  • the push floor 4 has a central opening 10 which opens a passage for the feed pipe through the push floor during its back and forth movement relative to the outflow opening.
  • the outflow opening 9 of the feed pipe 8 is alternately on one or the other side of the moving floor 4 when the pushing floor 4 is pushed back and forth relative to the outflow opening.
  • the inflow of the suspension to be separated is introduced into the sump 28, when the sieve bottom 4, after the filter cake has been pushed away, moves to the next turning point and has thus exposed the longitudinal section of the filter surface, so that the liquid of the suspension, unhindered by no filter cake layer, is discharged through the sieve surface of the drum 2.
  • the filter cake is pushed along the screening drum 2 in both longitudinal directions.
  • the feed tube 8 can be provided for directing the current in the radially outward direction with a baffle plate, as z. B. in Figs. 1 and 2 at the end of the tube 8 can be seen. It would also be possible, as shown in FIG. 3, to close the feed pipe 8 with a cover and to arrange openings 9 for the outflow of the suspension to be supplied.
  • the wall delimiting the central opening 10 in the moving floor 4 has a wedge-shaped cross section 11 which points against the direction of the flow direction of the suspension flowing out radially and for distributing the flow of the suspension serves.
  • a friction disc 12 or 13 arranged coaxially and parallel to the moving floor is attached to the moving floor 4 on both sides.
  • the attachment is provided by a few rods 24, which are each arranged between the moving floor and the respective friction disc 12 or 13.
  • the friction disk 13 attached to the side of the sliding floor 4 facing the feed pipe 8 is provided with a central opening 14 provided for the passage of the feed pipe.
  • the structure fastened together consisting of the sliding floor 4 and the friction disks 12 and 13, is supported, rotated and displaced by means of a shaft 25 which is fastened to the friction disk 12.
  • the screen drum 2 is overhung in the housing 1
  • the embodiment according to FIG. 6 shows storage on both sides of the screen drum 2 in the centrifuge housing 1.
  • a push centrifuge according to the invention can be built, in which the sieve drum has a cylindrical part 15 in the middle, which merges on both sides into a conical part 16 that widens in the direction of the discharge openings 7 on both sides of this sieve drum.
  • This screen drum is mounted on both sides in the housing.
  • the push floor 4 is slidably arranged along the cylindrical part 15.
  • the pusher centrifuge as shown in FIGS. 1, 2 and 5, is provided with a washing device 17 and 18 for washing the filter cake on the sieve surface of the sieve drum 2.
  • the washing device 17 has a body 21 which is built into the interior of the screening drum 2 and is fastened to the wall of the screening drum. Lines 22 lead through this body to nozzles 23, through which a washing liquid is thrown out in the direction of the filter cake on the sieve surface of the sieve drum 2.
  • the washing liquid is fed through a line 19 and is passed into a channel 20 on the wall of the screening drum 2, from which the lines 22 lead to the nozzles 23.
  • the body 21 can, as is particularly clearly shown in FIG.
  • FIG. 1 A two-stage centrifuge according to the invention is shown schematically in FIG.
  • Two nested drum 2 1 and 2 2 forming a two-stage centrifuge are provided.
  • the outer drum 2 2 is rotatable by means of a shaft 26 which is attached to its end wall.
  • the structure consisting of the sliding floor 4 and the friction disks 12 and 13 is also fastened to this end wall by means of the rods 29.
  • the push floor 4 is arranged in the middle of the screening drum 2 2 .
  • the screening drum 2 1 is nested in the screening drum 2 2 and can be displaced axially relative to the latter.
  • oscillating displacement tie rods 27 are used, which lead through slots 30 in the screen drum 2 2 and are connected to the screen drum 2 1 .
  • the structure of the moving floor 4 and the friction disks 12 and 13 rotates together with the sieve drum 2 2 and is axially immovable relative to the sieve drum 2 2 .
  • a relative displacement between the sliding floor 4 and the screening drum of the first stage 2 1 is achieved by moving this screening drum by means of the tie rods 27.
  • This longitudinally axial, oscillating displacement of the sieve drum 2 1 on the one hand transports the filter cake on the sieve surface of the sieve drum 2 1 , so that it is pushed onto the sieve surface of the sieve drum of the second stage 2 2 , and at the same time it is also along the sieve surface of the sieve drum the second stage 2 2 in the direction of the discharge openings 7, on both sides of the screening drum 2 2 , and falls there as a product.
  • the relative displacement between the outflow opening 9 of the feed pipe 8 1 and the sliding floor 4, which is arranged here axially immovable, that is to say remaining in its longitudinal axial position, is achieved by longitudinally axially, oscillating displacement of the feed pipe 8 1 .
  • the two displacements: the displacement of the screen drum 2 1 relative to the moving floor 4 and the displacement of the feed pipe 8 1 relative to the moving floor 4 take place in the same cycle.

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  • Centrifugal Separators (AREA)

Description

Die Anmeldung betrifft eine Schubzentrifuge mit mindestens einer in einem Gehäuse rotierbar gelagerten Siebtrommel und mit einem in der Siebtrommel zu ihr koaxial angeordneten, scheibenförmigen Schubboden, der rotierbar und zwischen Wendepunkten relativ zu der Siebtrommel in der Längsrichtung hin und her verschiebbar ist, und zum Bestreichen eines Längsabschnittes der Filterfläche der Siebtrommel und zum Schieben eines Filterkuchens der Siebtrommel entlang in Richtung zu Austragsöffnungen für den Filterkuchen vorgesehen ist, wobei die Wendepunkte vorzugsweise beiderseits der gedachten Mittellinie der Siebtrommel liegen, wobei zum Zuführen der zu trennenden Suspension in der Siebtrommel ein koaxial zu ihr angeordnetes Speiserohr vorgesehen ist, und wobei an den beiden Seiten der Siebtrommel die Austragsöffnungen für den Filterkuchen vorhanden sind.The application relates to a pusher centrifuge with at least one sieve drum rotatably mounted in a housing and with a disk-shaped sliding floor arranged coaxially in the sieve drum, which is rotatable and can be moved back and forth in the longitudinal direction between turning points relative to the sieve drum, and for coating one Longitudinal section of the filter surface of the sieve drum and for pushing a filter cake along the sieve drum in the direction towards discharge openings for the filter cake is provided, the turning points preferably being on both sides of the imaginary center line of the sieve drum, with a coaxially arranged to feed the suspension to be separated in the sieve drum The feed tube is provided, and the discharge openings for the filter cake are provided on both sides of the sieve drum.

Solche Schubzentrifugen sind zum Beispiel aus DE-AS 1 065333 und aus DE-AS 1 114149 bekannt.Such push centrifuges are known for example from DE-AS 1 065333 and from DE-AS 1 114149.

Die generellen Vorteile der Schubzentrifuge, wie hoher Durchsatz und kleine Restfeuchte sind verbunden mit dem Nachteil, dass die Zentrifuge nur mit relativ hohen Feststoffkonzentrationen gespeist werden kann. Nimmt die Einlaufkonzentration ab, so besteht die Gefahr des Schwemmens. Mit Schwemmen wird der Betriebszustand bezeichnet, wenn die Entwässerungszeit zwischen zwei Hüben des Schubbodens nicht ausreicht, um den Sumpf vor dem Schubboden soweit zu entwässern, dass der Kuchen transportierbar wird. Als Sumpf wird hier der Längsabschnitt der Siebtrommel bezeichnet, der vom Schubboden bestrichen wird. Falls die Entwässerung nicht ausreicht, befindet sich im Sumpf beim Zurückkehren des Schubbodens immer noch eine Suspension, die nicht als Kuchen verschiebbar ist, wodurch es zu dem erwähnten Schwemmen kommt.The general advantages of the pusher centrifuge, such as high throughput and low residual moisture, are associated with the disadvantage that the centrifuge can only be fed with relatively high solids concentrations. If the inlet concentration decreases, there is a risk of washing up. Flooding is the operating state when the drainage time between two strokes of the moving floor is not sufficient to drain the swamp in front of the moving floor to such an extent that the cake can be transported. The sump is the longitudinal section of the screening drum that is swept by the moving floor. If the drainage is not sufficient, there is still a suspension in the swamp when the moving floor returns, which cannot be moved as a cake, which leads to the above-mentioned flooding.

Das ist auch der Fall bei den beiden oben genannten, bekannten Zentrifugen. Sie weisen für jede Seite bezüglich des Schubbodens eine getrennte Speiseleitung auf, von welchen eine an einer Seite und die zweite an der anderen Seite des Schubbodens münden, so dass der Sumpfbereich beiderseits des Schubbodens unter einer ständigen Zufuhr der Suspension steht und zum Schwemmen kommen kann.This is also the case with the two known centrifuges mentioned above. They have a separate feed line for each side with respect to the moving floor, one of which opens on one side and the second on the other side of the moving floor, so that the sump area on both sides of the moving floor is under constant supply of the suspension and can come to water.

Um dieses Problem zu lösen, d. h. in dem Sumpf eine ausreichende Entwässerung zu erreichen, wurde verschiedentlich versucht zusätzliche Siebflächen in die Zentrifuge an dem Wege der zu trennenden Suspension zu dem Sumpf hin einzubauen. Es ist jedoch mit diesen Massnahmen nicht gelungen, den Einsatzbereich der Schubzentrifuge in Richtung zu dünnen Suspensionen zu vergrössern.To solve this problem, i. H. In the swamp to achieve sufficient drainage, various attempts have been made to incorporate additional sieve surfaces into the centrifuge on the path of the suspension to be separated to the swamp. However, these measures have not succeeded in increasing the range of use of the pusher centrifuge in the direction of thin suspensions.

Bei verhältnismässig gut sedimentierbaren Suspensionen werden solche dünnen Suspensionen zuerst durch statisches Sedimentieren eingedickt und erst nachher in eine Schubzentrifuge eingeführt. Bei schlecht sedimentierenden Suspensionen werden zur Voreindickung eventuell andere Maschinen eingesetzt, wie z. B. Zentrifugaldekanter, mit denen es möglich ist auch dünne Suspensionen zu verarbeiten. Diese Systeme sind konstruktionsmässig recht kompliziert und dementsprechend teuer und was die Bedienung betrifft problematisch.In the case of suspensions that are relatively easy to sediment, such thin suspensions are first thickened by static sedimentation and only then introduced into a batch centrifuge. In the case of poorly sedimenting suspensions, other machines may be used for pre-thickening, e.g. B. centrifugal decanters with which it is also possible to process thin suspensions. These systems are structurally quite complicated and accordingly expensive and problematic in terms of operation.

Der Erfindung liegt die Aufgabe zugrunde, eine Schubzentrifuge der anfangs angegebenen Art zu schaffen, mit welcher sich auch dünne Suspensionen verarbeiten lassen.The invention has for its object to provide a pusher centrifuge of the type specified, with which thin suspensions can be processed.

Diese Aufgabe wird erfindungsgemäss dadurch gelöst, dass die Ausflussöffnung des Speiserohrs radial nach aussen weist, in der Mitte zwischen den beiden Wendepunkten des Schubbodens liegt, und dass der Schubboden eine zentrale Oeffnung aufweist, die einen Durchgang für das Speiserohr durch den Schubboden freigibt, so dass sich die Ausflussöffnung des Speiserohres beim Hin- und Herverschieben des Schubbodens relativ zu der Ausflussöffnung abwechselnd an der einen oder anderen Seite des Schubbodens befindet.This object is achieved according to the invention in that the outflow opening of the feed pipe points radially outwards, lies in the middle between the two turning points of the push floor, and in that the push floor has a central opening which clears a passage for the feed pipe through the push floor, so that the outflow opening of the feed pipe is alternately located on one or the other side of the moving floor when the pushing floor is pushed back and forth relative to the outflow opening.

Durch diese erfindungsgemässe Anordnung ist es möglich, ein neues Verfahren bei der Anwendung einer Schubzentrifuge durchzuführen : Der Strom der zufliessenden Suspension wird erst dann in den Sumpf zugelassen, wenn der Sumpfabschnitt durch das Verschieben des Schubbodens freigelegt wurde, so dass die freigemachte Siebfläche die Flüssigkeit der eintretenden Suspension durchlassen kann. Das Verteilen der zu trennenden Suspension auf die beiden Trommelabschnitte erfolgt automatisch durch Verschieben des Schubbodens, wobei jedoch der Durchfluss der Suspension durch das Speiserohr ununterbrochen bleibt, so dass es zu keinen Druckschlägen in der die Suspension führenden Rohrleitung kommt.With this arrangement according to the invention, it is possible to carry out a new process when using a push centrifuge: the flow of the incoming suspension is only allowed into the sump when the sump section has been exposed by moving the push floor, so that the cleared sieve surface the liquid of can pass through entering suspension. The suspension to be separated is distributed automatically to the two drum sections by moving the moving floor, but the flow of the suspension through the feed pipe remains uninterrupted, so that there are no pressure surges in the pipeline carrying the suspension.

Nach einem Ausführungsbeispiel der erfindungsgemässen Schubzentrifuge ist diese mit einer Waschvorrichtung zum Waschen des Filterkuchens an der Siebfläche der Siebtrommel versehen.According to one embodiment of the push centrifuge according to the invention, it is provided with a washing device for washing the filter cake on the sieve surface of the sieve drum.

Nach einem weiteren Ausführungsbeispiel ist es möglich, die Schubzentrifuge als zweistufig arbeitende Zentrifuge zu gestalten.According to another embodiment, it is possible to design the push centrifuge as a two-stage centrifuge.

Im weiteren wird der Erfindungsgegenstand anhand Beschreibung einiger Ausführungsbeispiele näher erklärt. Die Beschreibung bezieht sich auf Zeichnungen, in denen zeigen :

  • Figur 1 im Längsschnitt die Schubzentrifuge, in der sich der Schubboden an einem Wendepunkt befindet,
  • Figur 2 dieselbe Schubzentrifuge, bei welcher jedoch der Schubboden an dem anderen Wendepunkt steht,
  • Figur 3 eine Ausführung des Speiserohres im Längsschnitt und in einem dazugehörenden Querschnitt gemäss Linie 1/1,
  • Figur 4 einen Teil der Zentrifuge un vergrössertem Massstab,
  • Figur 5 einen anderen Teil der Zentrifuge in vergrössertem Massstab,
  • Figur 6 ein weiteres Ausführungsbeispiel im Längsschnitt,
  • Figur 7 eine anwendbare Siebtrommel im Längsschnitt,
  • Figur 8 schematisch, eine zweistufige Schubzentrifuge.
The subject matter of the invention is explained in more detail below on the basis of the description of some exemplary embodiments. The description refers to drawings in which:
  • FIG. 1 shows the pusher centrifuge in longitudinal section, in which the pusher floor is located at a turning point,
  • FIG. 2 shows the same push centrifuge, but with the push floor at the other turning point,
  • Figure 3 shows an embodiment of the feed pipe in longitudinal section and in a corresponding cross section according to line 1/1,
  • FIG. 4 shows a part of the centrifuge on an enlarged scale,
  • FIG. 5 shows another part of the centrifuge on an enlarged scale,
  • FIG. 6 shows another embodiment in longitudinal section,
  • FIG. 7 shows an applicable screening drum in longitudinal section,
  • Figure 8 schematically, a two-stage pusher centrifuge.

In einem Gehäuse 1 der Schubzentrifuge ist rotierbar eine Siebtrommel 2 gelagert. In der Siebtrommel 2 und zu ihr koaxial ist ein scheibenförmiger Schubboden 4 angeordnet, der rotierbar ist und zwischen zwei Wendepunkten, 5 in Fig. 1, und 6 in Fig. 2, relativ zu der Siebtrommel 2 in der Längsrichtung hin und her verschiebbar ist. Bei dieser Hin- und Herbewegung bestreicht der Schubboden 4 einen Längsabschnitt zwischen den Wendepunkten 5 und 6 der Filterfläche der Siebtrommel 2 und verschiebt dabei jeweils einen Filterkuchen der Siebtrommel 2 entlang in Richtung zu Austragsöffnungen 7, die für das Herauslassen des Filterkuchens vorgesehen sind. Jeweils nach dem Verschieben des Filterkuchens in Richtung zu den Austragsöffnungen und nach dem Verschieben des Schubbodens zu dem jeweiligen Wendepunkt entsteht so zwischen dem Filterkuchen und dem Schubboden ein leerer Raum, der Sumpf, der hier mit 28 bezeichnet ist.A screen drum 2 is rotatably mounted in a housing 1 of the pusher centrifuge. In the screening drum 2 and coaxially with it, a disc-shaped sliding floor 4 is arranged, which is rotatable and can be moved back and forth in the longitudinal direction between two turning points, 5 in FIG. 1 and 6 in FIG. 2, relative to the screening drum 2. During this back-and-forth movement, the push floor 4 sweeps a longitudinal section between the turning points 5 and 6 of the filter surface of the screening drum 2 and in each case moves a filter cake along the screening drum 2 in the direction of discharge openings 7, which are provided for the filter cake to be let out. Each time the filter cake is moved in the direction of the discharge openings and after the sliding floor is moved to the respective turning point, an empty space is created between the filter cake and the moving floor, the sump, which is designated here by 28.

Die Wendepunkte 5 und 6 liegen vorzugsweise beiderseits der gedachten Mittellinie 3, in Fig. 1, der Siebtrommel 2, der Schubboden 4 oszilliert also in einem Längsabschnitt der Siebtrommel um diese gedachte Mittellinie 3. Zum Zuführen einer zu trennenden Suspension in die Siebtrommel 2 ist ein Speiserohr 8 vorgesehen, das zu der Siebtrommel koaxial angeordnet ist. Eine Ausflussöffnung 9 des Speiserohres 8 liegt in der Mitte zwischen den beiden Wendepunkten 5 und 6 des Schubbodens 4 und weist den Strom der Suspension radial nach aussen, d. h. in radialer Richtung zu der Siebfläche der Siebtrommel 2. Dabei hat der Schubboden 4 eine zentrale Oeffnung 10, die einen Durchgang für das Speiserohr durch den Schubboden bei seiner Hin- und Herbewegung relativ zu der Ausflussöffnung freigibt. Auf diese Weise befindet sich die Ausflussöffnung 9 des Speiserohres 8 bei dem Hin- und Herverschieben des Schubbodens 4 relativ zu der Ausflussöffnung abwechselnd auf der einen oder anderen Seite des Schubbodens 4. So wird jeweils der Zufluss der zu trennenden Suspension in den Sumpf 28 eingeleitet, wenn sich der Siebboden 4, nach dem Wegschieben des Filterkuchens zu dem nächsten Wendepunkt hin bewegt und so den Längsabschnitt der Filterfläche freigelegt hat, so dass die Flüssigkeit der Suspension, durch keine Filterkuchenschicht behindert, durch die Siebfläche der Trommel 2 abgeführt wird. Auf diese Weise wird der Filterkuchen der Siebtrommel 2 entlang in beiden Längsrichtungen weggeschoben. Zum Herausführen des Filterkuchens, des Produktes aus der Siebtrommel sind an beiden Seiten der Siebtrommel 2 Austragsöffnungen 7 für das Produkt vorhanden.The turning points 5 and 6 are preferably on both sides of the imaginary center line 3, in FIG. 1, the sieve drum 2, the push floor 4 thus oscillates in a longitudinal section of the sieve drum about this imaginary center line 3. To feed a suspension to be separated into the sieve drum 2 is a Provided feed tube 8 which is arranged coaxially with the sieve drum. An outflow opening 9 of the feed pipe 8 is located in the middle between the two turning points 5 and 6 of the moving floor 4 and points the flow of the suspension radially outwards, ie. H. in the radial direction to the sieve surface of the sieve drum 2. The push floor 4 has a central opening 10 which opens a passage for the feed pipe through the push floor during its back and forth movement relative to the outflow opening. In this way, the outflow opening 9 of the feed pipe 8 is alternately on one or the other side of the moving floor 4 when the pushing floor 4 is pushed back and forth relative to the outflow opening. Thus, the inflow of the suspension to be separated is introduced into the sump 28, when the sieve bottom 4, after the filter cake has been pushed away, moves to the next turning point and has thus exposed the longitudinal section of the filter surface, so that the liquid of the suspension, unhindered by no filter cake layer, is discharged through the sieve surface of the drum 2. In this way, the filter cake is pushed along the screening drum 2 in both longitudinal directions. To discharge the filter cake, the product from the sieve drum, there are 2 discharge openings 7 for the product on both sides of the sieve drum.

Das Speiserohr 8 kann zum Lenken des Stromes in der Richtung radial auswärts mit einer Prallplatte versehen sein, wie es z. B. in der Fig. 1 und 2 am Ende des Rohres 8 zu sehen ist. Es wäre aber auch möglich, wie es in der Fig. 3 gezeigt ist, das Speiserohr 8 mit einem Deckel abzuschliessen und für den Ausfluss der zuzuführenden Suspension Oeffnungen 9 anzuordnen.The feed tube 8 can be provided for directing the current in the radially outward direction with a baffle plate, as z. B. in Figs. 1 and 2 at the end of the tube 8 can be seen. It would also be possible, as shown in FIG. 3, to close the feed pipe 8 with a cover and to arrange openings 9 for the outflow of the suspension to be supplied.

Wie es besonders in der Fig. 4 deutlich zu sehen ist, weist die die zentrale Oeffnung 10 in dem Schubboden 4 begrenzende Wand einen keilförmigen Querschnitt 11 auf, welcher gegen die Richtung der Strommrichtung der radial auswärts ausfliessenden Suspension weist und zum Verteilen des Stromes der Suspension dient.As can be seen particularly clearly in FIG. 4, the wall delimiting the central opening 10 in the moving floor 4 has a wedge-shaped cross section 11 which points against the direction of the flow direction of the suspension flowing out radially and for distributing the flow of the suspension serves.

Vorteilhafterweise ist an dem Schubboden 4 beiderseits je eine koaxial und parallel zu den Schubboden angeordnete Reibscheibe 12 bzw. 13 befestigt. Die Befestigung ist durch einige Stangen 24 gegeben, die jeweils zwischen dem Schubboden und der jeweiligen Reibscheibe 12 oder 13 angeordnet sind. Zwischen dem Schubboden 4 und der Reibscheibe 12 bzw. 13 ist so jeweils ein Zwischenraum gegeben für einen Durchfluss der zu trennenden Suspension in Richtung zu der Siebfläche der Siebtrommel 2. Die an der dem Speiserohr 8 zugewandten Seite des Schubbodens 4 angebrachte Reibscheibe 13 ist mit einer zentralen Oeffnung 14 zum Durchgang des Speiserohres versehen. Diese Reibscheiben 12 und 13 richten so den Strom der Suspension in den Raum des Sumpfes 28 und verhindern ein Zersprühen der Suspension in den sonstigen Innenraum der Siebtrommel 2. Sie beschleunigen, zusammen mit der Wand des Schubbodens 4 die Suspension in radialer Richtung.Advantageously, a friction disc 12 or 13 arranged coaxially and parallel to the moving floor is attached to the moving floor 4 on both sides. The attachment is provided by a few rods 24, which are each arranged between the moving floor and the respective friction disc 12 or 13. Between the sliding floor 4 and the friction disk 12 or 13 there is in each case a space for a flow of the suspension to be separated in the direction of the screening surface of the screening drum 2. The friction disk 13 attached to the side of the sliding floor 4 facing the feed pipe 8 is provided with a central opening 14 provided for the passage of the feed pipe. These friction disks 12 and 13 thus direct the flow of the suspension into the space of the sump 28 and prevent the suspension from spraying into the other interior of the screening drum 2. Together with the wall of the moving floor 4, they accelerate the suspension in the radial direction.

Das zusammenbefestigte Gebilde, bestehend aus dem Schubboden 4 und den Reibscheiben 12 und 13 wird gelagert, rotiert und verschoben mittels einer Welle 25, die an der Reibscheibe 12 befestigt ist.The structure fastened together, consisting of the sliding floor 4 and the friction disks 12 and 13, is supported, rotated and displaced by means of a shaft 25 which is fastened to the friction disk 12.

Wobei in dem Ausführungsbeispiel, welches besonders in den Fig. 1 und 2 gezeigt ist, die Siebtrommel 2 in dem Gehäuse 1 fliegend gelagert ist, zeigt das Ausführungsbeispiel gemäss Fig. 6 eine Lagerung an beiden Seiten der Siebtrommel 2 in dem Zentrifugengehäuse 1.1 and 2, the screen drum 2 is overhung in the housing 1, the embodiment according to FIG. 6 shows storage on both sides of the screen drum 2 in the centrifuge housing 1.

Nach dem Beispiel gemäss Fig. 7 lässt sich eine erfindungsgemässe Schubzentrifuge bauen, bei welcher die Siebtrommel in der Mitte einen zylindrischen Teil 15 aufweist, welcher beiderseits in einen konischen, sich in Richtung zu den Austragsöffnungen 7 an beiden Seiten dieser Siebtrommel erweiternden Teil 16 übergeht. Diese Siebtrommel ist an ihren beiden Seiten in dem Gehäuse gelagert. Der Schubboden 4 ist entlang dem zylindrischen Teil 15 verschiebbar angeordnet. Mit einer derartigen Siebtrommel wird einerseits eine Verlängerung der Siebflächen der Trommel ermöglicht und gleichzeitig auch der Transport des Filterkuchens und sein Austragen durch die Austragsöffnungen 7 entlang einer solchen verlängerten Siebfläche erleichtert.According to the example according to FIG. 7, a push centrifuge according to the invention can be built, in which the sieve drum has a cylindrical part 15 in the middle, which merges on both sides into a conical part 16 that widens in the direction of the discharge openings 7 on both sides of this sieve drum. This screen drum is mounted on both sides in the housing. The push floor 4 is slidably arranged along the cylindrical part 15. With such a screening drum one On the one hand, an extension of the sieve surfaces of the drum is made possible and, at the same time, the transport of the filter cake and its discharge through the discharge openings 7 along such an elongated sieve surface are facilitated.

Die Schubzentrifuge, wie es in den Fig. 1, 2 und 5 gezeigt ist, ist mit einer Waschvorrichtung 17 bzw. 18 zum Waschen des Filterkuchens an der Siebfläche der Siebtrommel 2 versehen. Die Waschvorrichtung 17 weist einen Korpus 21 auf, welcher in den Innenraum der Siebtrommel 2 eingebaut ist und an der Wand der Siebtrommel befestigt ist. Durch diesen Korpus führen Leitungen 22 zu Düsen 23, durch welche eine Waschflüssigkeit in Richtung auf den Filterkuchen auf der Siebfläche der Siebtrommel 2 herausgeschleudert wird. Die Waschflüssigkeit wird durch eine Leitung 19 zugeführt und wird in eine Rinne 20 an der Wand der Siebtrommel 2, aus welcher die Leitungen 22 zu den Düsen 23 führen, geleitet. Der Korpus 21 kann, wie es in Fig. 5 besonders deutlich gezeigt ist, zu einer zusätzlichen Lagerung der Welle 25 dienen, welche das Gebilde aus dem Schubboden 4 und den zwei Reibscheiben 12 und 13 trägt. Auf der anderen Seite der Schubzentrifuge ist das Waschen des Filterkuchens mittels einiger Rohre 18 möglich, durch welche die Waschflüssigkeit in den Innenraum der Siebrommel 2 geführt wird.The pusher centrifuge, as shown in FIGS. 1, 2 and 5, is provided with a washing device 17 and 18 for washing the filter cake on the sieve surface of the sieve drum 2. The washing device 17 has a body 21 which is built into the interior of the screening drum 2 and is fastened to the wall of the screening drum. Lines 22 lead through this body to nozzles 23, through which a washing liquid is thrown out in the direction of the filter cake on the sieve surface of the sieve drum 2. The washing liquid is fed through a line 19 and is passed into a channel 20 on the wall of the screening drum 2, from which the lines 22 lead to the nozzles 23. The body 21 can, as is particularly clearly shown in FIG. 5, serve for an additional mounting of the shaft 25, which carries the structure from the sliding floor 4 and the two friction disks 12 and 13. On the other side of the pusher centrifuge, it is possible to wash the filter cake by means of a few pipes 18, through which the washing liquid is fed into the interior of the screening drum 2.

In der Fig. 8 ist schematisch eine zweistufige erfindungsgemässe Zentrifuge gezeigt. Dabei sind zwei ineinander geschachtelte, eine zweistufige Zentrifuge bildende Siebtrommel 21 und 22 vorgesehen. Die äussere Siebtrommel 22 ist mittels einer Welle 26 rotierbar, welche an ihrer Stirnwand befestigt ist. An dieser Stirnwand ist auch mittels der Stangen 29 das Gebilde bestehend aus dem Schubboden 4 und den Reibscheiben 12 und 13 befestigt. Der Schubboden 4 ist so in der Mitte der Siebtrommel 22 angeordnet. Die Siebtrommel 21 ist in der Siebtrommel 22 geschachtelt angeordnet und relativ zu dieser längsaxial verschiebbar. Zu dieser längsaxialen, oszillierenden Verschiebung dienen Zugstangen 27, die durch Schlitze 30 in die Siebtrommel 22 führen und mit der Siebtrommel 21 verbunden sind. Das Gebilde aus dem Schubboden 4 und den Reibscheiben 12 und 13 rotiert zusammen mit der Siebtrommel 22 und ist längsaxial relativ zu der Siebtrommel 22 unverschiebbar. Eine relative Verschiebung zwischen dem Schubboden 4 und der Siebtrommel der ersten Stufe 21 wird durch das Verschieben dieser Siebtrommel mittels der Zugstangen 27 erreicht. Durch dieses längsaxiale, oszillierende Verschieben der Siebtrommel 21 wird einerseits der Filterkuchen an der Siebfläche der Siebtrommel 21 transportiert, so dass er auf die Siebfläche der Siebtrommel der zweiten Stufe 22 hingeschoben wird, und er wird damit gleichzeitig auch entlang der Siebfläche der Siebtrommel der zweiten Stufe 22 in Richtung zu den Austragsöffnungen 7, beiderseits der Siebtrommel 22, geschoben und fällt dort als Produkt heraus.A two-stage centrifuge according to the invention is shown schematically in FIG. Two nested drum 2 1 and 2 2 forming a two-stage centrifuge are provided. The outer drum 2 2 is rotatable by means of a shaft 26 which is attached to its end wall. The structure consisting of the sliding floor 4 and the friction disks 12 and 13 is also fastened to this end wall by means of the rods 29. The push floor 4 is arranged in the middle of the screening drum 2 2 . The screening drum 2 1 is nested in the screening drum 2 2 and can be displaced axially relative to the latter. For this longitudinal axial, oscillating displacement tie rods 27 are used, which lead through slots 30 in the screen drum 2 2 and are connected to the screen drum 2 1 . The structure of the moving floor 4 and the friction disks 12 and 13 rotates together with the sieve drum 2 2 and is axially immovable relative to the sieve drum 2 2 . A relative displacement between the sliding floor 4 and the screening drum of the first stage 2 1 is achieved by moving this screening drum by means of the tie rods 27. This longitudinally axial, oscillating displacement of the sieve drum 2 1 on the one hand transports the filter cake on the sieve surface of the sieve drum 2 1 , so that it is pushed onto the sieve surface of the sieve drum of the second stage 2 2 , and at the same time it is also along the sieve surface of the sieve drum the second stage 2 2 in the direction of the discharge openings 7, on both sides of the screening drum 2 2 , and falls there as a product.

Die relative Verschiebung zwischen der Ausflussöffnung 9 des Speiserohres 81 und dem Schubboden 4, welcher hier längsaxial unverschiebbar, also in seiner längsaxialen Position verbleibend angeordnet ist, wird durch längsaxiales, oszillierendes Verschieben des Speiserohres 81 erzielt. Die beiden Verschiebungen : das Verschieben der Siebtrommel 21 relativ zu dem Schubboden 4 und das Verschieben des Speiserohres 81 relativ zu dem Schubboden 4, erfolgen im gleichen Takt.The relative displacement between the outflow opening 9 of the feed pipe 8 1 and the sliding floor 4, which is arranged here axially immovable, that is to say remaining in its longitudinal axial position, is achieved by longitudinally axially, oscillating displacement of the feed pipe 8 1 . The two displacements: the displacement of the screen drum 2 1 relative to the moving floor 4 and the displacement of the feed pipe 8 1 relative to the moving floor 4 take place in the same cycle.

Aehnlich wäre es möglich auch mehrstufige Zentrifugen in der Art der Erfindung zu bauen.Similarly, it would also be possible to build multi-stage centrifuges in the manner of the invention.

Claims (6)

1. Pusher centrifuge with at least one sieve drum (2) which is rotatably mounted in a housing (1) and with a disc-shaped pusher floor member (4) arranged in the sieve drum coaxially thereto, which pusher floor member is rotatable and is able to be displaced to and fro relative to the sieve drum (2) in the longitudinal direction between turning points (5 and 6), and is provided to make wiping contact with a longitudinal- section of the filter surface of the sieve drum and to push a filter cake along the sieve drum in the direction of discharge openings (7) for the filter cake, where the turning points preferably lie on both sides of the imaginary centre line (3) of the sieve drum, where for the infeed of the suspension which is to be separated in the sieve drum (2) a feed pipe (8, resp. 81) is provided arranged coaxially thereto, and where the discharge openings (7) for the filter cake are present on the two sides of the sieve drum (2), characterized in that the outflow opening (9) of the feed pipe (8 resp. 81) extends radially outward, lies in the centre between the two turning points (5 and 6) of the pusher floor member (4), and that the pusher floor member (4) has a central opening (10), which provides a free passage for the feed pipe through the pusher floor member (4), so that the outflow opening (9) of the feed pipe (8) during the to-and-fro displacement of the pusher floor member (4) relative to the outflow opening (9) is alternately located on the one or other side of the pusher floor member (4).
2. Pusher centrifuge according to Claim 1, characterized in that, for distributing the flow of suspension radially outwards, the wall delimiting the central opening (10) in the pusher floor member (4) has a wedge-shaped cross-section (11) tapering outwardly to the direction of flow.
3. Pusher centrifuge according to Claim 1, characterized in that there is secured to the pusher floor member (4) on both sides in each case a friction disc (12 resp. 13) arranged coaxially and parallel thereto, respectively leaving free between the pusher floor member (4) and the friction disc (12 resp. 13) an intermediate space for a throughflow of the suspension which is to be separated in the direction of the sieve surface of the sieve drum (2), where the friction disc (13) mounted at the side of the pusher floor member which meets the feed pipe (8) is provided with a central opening (14) for the passage of the feed pipe therethrough.
4. Pusher centrifuge according to Claim 1, in which the sieve drum has a cylindrical portion (15 in Fig. 7), which merges at both ends into a conical portion (16) which widens in the direction of the discharge openings (7), where the sieve drum is mounted at both sides in a housing, and in which the pusher floor member (4) is arranged so as to be displaceable along the cylindrical portion (15).
5. Pusher centrifuge according to Claim 1, which is provided with a washing device (17 resp. 18) to wash the filter cake at the sieve surface of the sieve drum (2).'
6. Pusher centrifuge according to Claim 1, with two internested sieve drums (21 and 22 in Fig. 8) forming a double-stage centrifuge, in which the sieve drum of the first stage (21) is displaceable in the axial direction relative to the pusher floor member (4) and to the sieve drum of the second stage (22), whereby with this relative movement the filter cake can also be moved along the second stage, and in which the feed pipe (81) is displaceable relative to the pusher floor member (4) which is arranged to remain stationary in the axial direction in its longitudinal axial position.
EP82103444A 1981-06-25 1982-04-23 Pusher centrifuge Expired EP0068095B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH4199/81 1981-06-25
CH4199/81A CH653573A5 (en) 1981-06-25 1981-06-25 DRAWER CENTRIFUGE.

Publications (3)

Publication Number Publication Date
EP0068095A2 EP0068095A2 (en) 1983-01-05
EP0068095A3 EP0068095A3 (en) 1984-05-23
EP0068095B1 true EP0068095B1 (en) 1986-03-05

Family

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EP82103444A Expired EP0068095B1 (en) 1981-06-25 1982-04-23 Pusher centrifuge

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US (1) US4434052A (en)
EP (1) EP0068095B1 (en)
JP (1) JPS5845760A (en)
CA (1) CA1169831A (en)
CH (1) CH653573A5 (en)
DE (1) DE3269565D1 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4010748A1 (en) * 1989-04-13 1990-10-25 Stahl Werner METHOD FOR OPERATING AN EXTENSION CENTRIFUGE
US5305685A (en) * 1993-05-04 1994-04-26 Bunn-O-Matic Corporation Grounds removal centrifuge
EP0635309B1 (en) * 1993-07-22 1998-01-28 Sulzer-Escher Wyss AG Double pusher centrifuge
US5958235A (en) * 1997-08-22 1999-09-28 Baker Hughes Incorporated Continuous-feed filtering- or screening-type centrifuge with reslurrying and dewatering
EP2913112B1 (en) * 2014-02-26 2020-06-17 Ferrum AG Centrifuge, and method for loading a centrifuge
TR201818787T4 (en) * 2014-06-24 2019-01-21 Ferrum Ag Double Pusher Centrifuge and Pusher Base Equipment
KR102504657B1 (en) * 2019-11-18 2023-02-27 주식회사 엘지화학 Pressurizing centrifugal dehydrator

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1065333B (en) * 1959-09-10 Gebr. Heine, Viersen (RhId.) Continuously operating sieve centrifuge with a bottom running around the front or bottom of the sieve drum
DE1114149B (en) * 1959-11-17 1961-09-21 Karl Marx Stadt Maschf Pusher centrifuge with a push floor that discharges the material to be spun in both directions
DE1151468B (en) * 1961-06-27 1963-07-11 Karl Marx Stadt Maschf Pusher centrifuge with a push floor that discharges the material to be spun in both directions
JPS4531109Y1 (en) * 1967-03-10 1970-11-28
DE2542916B2 (en) * 1975-09-26 1980-08-07 Siebtechnik Gmbh, 4330 Muelheim Two-stage pusher centrifuge
JPS608872B2 (en) * 1976-02-13 1985-03-06 厚木機械株式会社 Dehydration device for removing impurities in wastewater

Also Published As

Publication number Publication date
CA1169831A (en) 1984-06-26
EP0068095A2 (en) 1983-01-05
EP0068095A3 (en) 1984-05-23
JPS5845760A (en) 1983-03-17
CH653573A5 (en) 1986-01-15
DE3269565D1 (en) 1986-04-10
US4434052A (en) 1984-02-28

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