EP0331924B1 - Pusher centrifuge - Google Patents
Pusher centrifuge Download PDFInfo
- Publication number
- EP0331924B1 EP0331924B1 EP89102291A EP89102291A EP0331924B1 EP 0331924 B1 EP0331924 B1 EP 0331924B1 EP 89102291 A EP89102291 A EP 89102291A EP 89102291 A EP89102291 A EP 89102291A EP 0331924 B1 EP0331924 B1 EP 0331924B1
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- European Patent Office
- Prior art keywords
- sieve
- drum
- drums
- sieve drum
- surface elements
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- 239000007787 solid Substances 0.000 claims description 11
- 239000011343 solid material Substances 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 claims 1
- 239000000463 material Substances 0.000 description 22
- 238000012216 screening Methods 0.000 description 5
- 239000000706 filtrate Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 239000012065 filter cake Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001033 granulometry Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
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Classifications
-
- 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 invention relates to a pusher centrifuge with at least one inner and one outer, rotatable in a housing with identical speed, at least approximately cylindrical sieve drum, wherein the sieve drums perform an oscillating movement in the axial direction relative to each other, and one end of the interior of the sieve drums dewatering centrifugal material can be fed, and with at least one co-rotating sliding floor, which is able to execute an oscillating movement in the axial direction of the sieve drums while transporting the at least partially dewatered centrifugal material on the inside of the sieve drums in the direction of a solids outlet provided at the other end of the sieve drums, whereby on the outlet side edge a push ring is provided for at least one inner sieve drum.
- Such push centrifuges are known, for example, from US-A-4 217 226 and US-A-4 209 405 and are used for the continuous dewatering of a centrifugal material, which is fed to the inner end of a centrifugal space via a feed pipe and is successively dewatered on the inside of the sieve drums .
- the centrifugal material is gradually transported in the direction of a solid material outlet by the axially oscillating movement of the push floor and one or more push rings, and at the same time non-drained centrifugal material is refilled in the vicinity of the push floor.
- Such a pusher centrifuge has a plurality of sieve drums, two adjacent sieve drums each oscillating in the axial direction relative to one another and the edge of the inner sieve drum acting as a push ring.
- the drum can oscillate in a two-stage pusher centrifuge, the second drum in a three-stage centrifuge, and the first and third drums in a four-stage centrifuge.
- the degree of dewatering or the residual moisture of the discharged solid is, however, not yet optimal in the case of known push centrifuges. Improvement could be achieved by increasing the dewatering time, which, however, reduces the throughput of the centrifuged material, or by increasing the speed of the centrifuge, which is not possible due to the abrasion occurring and for reasons of strength, and in addition the solid cake is even more compact and therefore still more becomes more impermeable.
- the invention has for its object to increase the degree of dewatering of a pusher centrifuge of the type mentioned and to reduce the residual moisture content of the discharged solid without changing the operating parameters of the centrifuge and without a complicated construction.
- this object is achieved in that the thrust ring is provided with surface elements which are oriented obliquely to the axis of the sieve drum and, in the oscillating movement of the sieve drum relative to the following sieve drum, impart an additional movement component in the circumferential direction of the sieve drums to the items to be transported in the axial direction.
- the surface elements can be provided on the edge of an inner sieve drum, which is able to oscillate axially relative to an outer sieve drum, or else on the edge of a non-oscillating drum, the lateral movement or shearing action being provided by the following oscillating drum.
- the surface elements can be flat surfaces that form an angle with the axis of the screening drum approximately between 30 o and 60 o , or they can be curved surfaces. In this case, adjacent surface elements on the circumference of the thrust ring can have the same orientation of the inclination or can alternately be inclined in opposite directions to one another.
- the invention makes use of the fact that has apparently not been taken into account and not recognized in the design of pusher centrifuges that with each dewatering in the centrifugal field a capillary layer is formed which is dependent on the granulometry and which can be several millimeters thick and which influences the residual moisture content of the centrifugal material. Because the inclined surface elements give the centrifugal material a transverse component in the circumferential direction in addition to the movement component in the axial direction towards the outlet, the bottom layer of the centrifugal product cake is destroyed by shearing action and released for further dewatering.
- the degree of dewatering of the centrifuged material on the transport route from the entry to the discharge can thus be increased without changing the operating parameters of the centrifuge, or the amount of the dewatered centrifuged material which has been passed through can be increased or the speed can be reduced and the wear can be reduced will.
- the pusher centrifuge shown in FIGS. 1 and 2 in perspective and in section has a centrifugal unit consisting of two rotatable, approximately cylindrical sieve drums 1 and 2, a surrounding centrifuge housing 3, a gaseous medium adjacent to the centrifugal unit at the outlet end, e.g. Air containing solids space 4, at the inner end of the centrifugal unit near a co-rotating moving floor 8 with a centrifugal material inlet 9 opening supply line 5 for the centrifuged material to be dewatered, a solids outlet 6, and a liquid space 7 for the ejected liquid.
- a centrifugal unit consisting of two rotatable, approximately cylindrical sieve drums 1 and 2, a surrounding centrifuge housing 3, a gaseous medium adjacent to the centrifugal unit at the outlet end, e.g. Air containing solids space 4, at the inner end of the centrifugal unit near a co-rotating moving floor 8 with a centrifugal material inlet 9 opening
- the inner screening drum 1 is mounted on a shaft 10, by means of which it can be set in rotation at a certain speed.
- the shaft 10 is displaceable in the axial direction and, with the aid of a drive device (not shown), is able to perform an oscillating movement in the axial direction with a certain amplitude in addition to its rotation.
- the outer screening drum 2 is fastened to a hollow shaft 11 with which it can also be rotated, but without an oscillating movement in the axial direction.
- the speed of the two drums 1 and 2 is identical.
- the centrifugal material to be dewatered is introduced into the interior of the innermost sieve drum 1 immediately afterwards through the feed pipe 5 and flows there radially outwards onto the sieve drum 1, where the dewatering process begins.
- the partially dewatered centrifugal material is transported through the moving floor 8 and via the oscillating sieve drum 1 in the direction of the adjoining outer sieve drum 2 and is further dewatered in the process.
- Additional centrifugal material to be dewatered is now continuously supplied through the inlet pipe 5.
- the partially dewatered centrifugal material reaches the end of the inner sieve drum 1, it is transported from its edge, which acts as a thrust ring, to the outer centrifugal drum 2 and is further dewatered there.
- the completely dewatered centrifuged material is transported through the relative oscillation of the two sieve drums 1 and 2 to the solids space 4, which it leaves via the solids outlet 6.
- the inclination of the thrust surfaces 12 is advantageously between 30 o and 60 o , for example 45 o .
- the centrifugal material additionally receives a movement component in the circumferential direction when the sieve drums 1 and 2 oscillate against one another. This apparently tears open and largely eliminates the capillary layer which forms directly on the inner surface of the screen drum 2 under the action of the constant feed impulses and prevents the filtrate from penetrating, so that a larger amount of filtrate can pass through with the same centrifugal force and the dewatering performance is significantly improved .
- the invention has been described above using a pusher centrifuge with two sieve drums and additional thrust segments on the edge of the inner sieve drum. It goes without saying that the push segments according to the invention can also be provided with an analog advantage in push centrifuges with a different number of drums, for example in push centrifuges with more than two sieve drums, on the outer edges of the respective inner sieve drums.
- the thrust segments are not as shown in the example described is formed as below about 45 ° inclined relative to the axis of flat surfaces, but in a suitable other shape, as shown for example in Figures 3a - 3d.
- the push surfaces can be flat surfaces (FIGS. 3a and 3b) or have a curvature (FIGS. 3c and 3d).
- the thrust surfaces on the thrust ring can all be inclined in the same direction (FIGS. 3a and 3c), or neighboring thrust surfaces may alternately have an opposite inclination (FIGS. 3b and 3d).
- the surface elements can also be formed by a suitable design of the thrust edge of the corresponding screening drum, for example by designing the edge 1 'with sawtooth-shaped notches 12', as shown in FIG. 3a.
- the notches can be milled directly into the edge of the sieve drum, or by placing them on the edge, e.g. screwed triangular segments can be formed.
- the latter has the advantage that when the edge is inevitably worn, the segments can be easily replaced and no reworking of the edge is required, so that the push centrifuge is particularly easy to maintain and can always be operated with optimum performance without great effort.
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- Centrifugal Separators (AREA)
Description
Die Erfindung betrifft eine Schubzentrifuge mit wenigstens einer inneren und einer äusseren, in einem Gehäuse mit identischer Drehzahl rotierbaren, wenigstens angenähert zylindrischen Siebtrommel, wobei die Siebtrommeln eine in Achsenrichtung relativ zueinander oszillierende Bewegung ausführen, und wobei in den Innenraum der Siebtrommeln an einem Ende ein zu entwässerndes Schleudergut zuführbar ist, und mit wenigstens einem mitrotierenden Schubboden, welcher eine in Achsenrichtung der Siebtrommeln oszillierende Bewegung unter Transport des zumindest teilweise entwässerten Schleudergutes auf der Innenseite der Siebtrommeln in Richtung zu einem an dem anderen Ende der Siebtrommeln vorgesehenen Feststoffauslass auszuführen vermag, wobei am auslassseitigen Rand wenigstens einer inneren Siebtrommel ein Schubring vorgesehen ist.The invention relates to a pusher centrifuge with at least one inner and one outer, rotatable in a housing with identical speed, at least approximately cylindrical sieve drum, wherein the sieve drums perform an oscillating movement in the axial direction relative to each other, and one end of the interior of the sieve drums dewatering centrifugal material can be fed, and with at least one co-rotating sliding floor, which is able to execute an oscillating movement in the axial direction of the sieve drums while transporting the at least partially dewatered centrifugal material on the inside of the sieve drums in the direction of a solids outlet provided at the other end of the sieve drums, whereby on the outlet side edge a push ring is provided for at least one inner sieve drum.
Solche Schubzentrifugen sind beispielsweise aus US-A-4 217 226 und US-A-4 209 405 vorbekannt und dienen zur kontinuierlichen Entwässerung eines Schleudergutes, wobei dieses über ein Zuführrohr dem inneren Ende eines Schleuderraumes zugeführt wird und auf der Innenseite der Siebtrommeln sukzessive entwässert wird. Während dieses Vorganges wird das Schleudergut durch die in Achsenrichtung oszillierende Bewegung des Schubbodens und eines oder mehrerer Schubringe allmählich in Richtung zu einem Festtoffauslass vortransportiert, und gleichzeitig wird in der Nähe des Schubbodens nicht entwässertes Schleudergut nachgefüllt. Eine solche Schubzentrifuge weist mehrere Siebtrommeln auf, wobei jeweils zwei benachbarte Siebtrommeln relativ zueinander in Achsenrichtung oszillieren und die Kante der jeweils inneren Siebtrommel als Schubring wirkt. Beispielsweise kann bei einer zweistufigen Schubzentrifuge die Trommel oszillieren, bei einer dreistufigen Zentrifuge die zweite Trommel, und bei einer vierstufigen Zentrifuge die erste und dritte Trommel.Such push centrifuges are known, for example, from US-A-4 217 226 and US-A-4 209 405 and are used for the continuous dewatering of a centrifugal material, which is fed to the inner end of a centrifugal space via a feed pipe and is successively dewatered on the inside of the sieve drums . During this process, the centrifugal material is gradually transported in the direction of a solid material outlet by the axially oscillating movement of the push floor and one or more push rings, and at the same time non-drained centrifugal material is refilled in the vicinity of the push floor. Such a pusher centrifuge has a plurality of sieve drums, two adjacent sieve drums each oscillating in the axial direction relative to one another and the edge of the inner sieve drum acting as a push ring. For example, the drum can oscillate in a two-stage pusher centrifuge, the second drum in a three-stage centrifuge, and the first and third drums in a four-stage centrifuge.
Mit einer solchen Schubzentrifuge ist eine kontinuierliche Entwässerung eines Schleudergutes möglich, wobei dieses im Laufe des Transportes auf der Innenseite der Siebtrommeln vom Schleuderguteinlass bis zum Feststoffauslass allmählich im Zentrifugalfeld entwässert wird und den Feststoffauslass in weitgehend entwässertem Zustand erreicht, während das Filtrat nach aussen durch die Siebtrommeln dringt und dort abgeführt wird.With such a centrifugal centrifuge, continuous dewatering of a centrifugal material is possible, this being gradually dewatered in the centrifugal field during transport on the inside of the sieve drums from the centrifuged material inlet to the solids outlet and reaching the solids outlet in a largely dewatered state, while the filtrate reaches the outside through the sieve drums penetrates and is discharged there.
Der Entwässerungsgrad oder die Restfeuchte des ausgetragenen Feststoffes ist jedoch bei vorbekannten Schubzentrifugen noch nicht optimal. Eine Verbessurg könnte zwar durch Verlängerung der Entwässerungszeit erreicht werden, was jedoch den Durchsatz des Schleudergutes herabsetzt, oder durch Erhöhung der Drehzahl der Zentrifuge, was jedoch wegen der auftretenden Abrasion und aus Festigkeitsgründen nicht beliebig möglich ist, und zusätzlich den Feststoffkuchen noch kompakter und damit noch undurchlässiger werden lässt.The degree of dewatering or the residual moisture of the discharged solid is, however, not yet optimal in the case of known push centrifuges. Improvement could be achieved by increasing the dewatering time, which, however, reduces the throughput of the centrifuged material, or by increasing the speed of the centrifuge, which is not possible due to the abrasion occurring and for reasons of strength, and in addition the solid cake is even more compact and therefore still more becomes more impermeable.
Aus DE-B-1 065 333 oder FR-A-1 295 577 sind anderseits Schubzentrifugen bekannt, deren Schubboden schräggestellt ist oder geneigte Flächen aufweist und mit unterschiedlicher Drehzahl rotiert, verglichen mit der Siebtrommel. Hierzu ist eine komplizierte Konstruktion und ein zusätzliches Getriebe erforderlich. Ausserdem wird eine Auflockerung und Umwälzung des Schleudergutes nur unmittelbar am Einlauf erreicht, während der Filterkuchen auf der Siebtrommel als relativ kompakte und zunehmend undurchlässige Masse vorgeschoben wird.On the other hand, push centrifuges are known from DE-B-1 065 333 or FR-A-1 295 577, the push bottom of which is inclined or has inclined surfaces and rotates at different speeds, compared to the sieve drum. This requires a complicated construction and an additional gear. In addition, loosening and circulation of the centrifuged material is only achieved directly at the inlet, while the filter cake is advanced on the sieve drum as a relatively compact and increasingly impermeable mass.
Aus der DE-B-1 120 379 ist eine Zentrifuge mit zwei mit unterschiedlicher Drehzahl rotierenden, jedoch in Achsenrichtung unverschieblichen und nicht-oszillierenden konischen Siebtrommeln bekannt, bei der am Aussenrand der inneren Siebtrommel eine Räumschnecke vorgesehen ist, die den über den inneren Konus und den Rand gleitenden Filterkuchen zufolge ihrer unterschiedlichen Drehzahl auf die folgende Siebtrommel fliegen lässt und vermittels ihrer flachen Schraubengänge, jedoch ohne Axialbewegung des Schraubenringes relativ zu den Siebtrommeln über den äusseren Konus schiebt.From DE-B-1 120 379 a centrifuge with two rotating at different speeds, but non-displaceable in the axial direction and non-oscillating conical sieve drums is known, in which a clearing screw is provided on the outer edge of the inner sieve drum, which over the inner cone and allows the filter cake sliding on the edge to fly onto the following sieve drum due to its different speed and pushes it over the outer cone relative to the sieve drums by means of its flat screw threads, but without axial movement of the screw ring.
Die Erfindung setzt sich die Aufgabe, den Entwässerungsgrad einer Schubzentrifuge der eingangs angegebenen Art zu erhöhen und die Restfeuchte des ausgetragenen Feststoffes herabzusetzen, ohne die Betriebsparameter der Zentrifuge zu ändern, und ohne kompliziertere Konstruktion.The invention has for its object to increase the degree of dewatering of a pusher centrifuge of the type mentioned and to reduce the residual moisture content of the discharged solid without changing the operating parameters of the centrifuge and without a complicated construction.
Erfindungsgemäss wird diese Aufgabe dadurch gelöst, dass der Schubring mit Flächenelementen versehen ist, welche schräg zur Achse der Siebtrommel orientiert sind und bei der oszillierenden Bewegung der Siebtrommel relativ zur folgenden Siebtrommel dem in Achsenrichtung transportierten Schleudergut eine zusätzliche Bewegungskomponente in Umfangsrichtung der Siebtrommeln erteilen.According to the invention, this object is achieved in that the thrust ring is provided with surface elements which are oriented obliquely to the axis of the sieve drum and, in the oscillating movement of the sieve drum relative to the following sieve drum, impart an additional movement component in the circumferential direction of the sieve drums to the items to be transported in the axial direction.
Die Flächenelemente können dabei am Rand einer inneren Siebtrommel, welche relativ zu einer äusseren Siebtrommel axial zu oszillieren vermag, vorgesehen sein, oder aber auch am Rand einer nicht-oszillierenden Trommel, wobei die Seitwärtsbewegung oder Scherwirkung durch die folgende oszillierende Trommel erbracht wird.The surface elements can be provided on the edge of an inner sieve drum, which is able to oscillate axially relative to an outer sieve drum, or else on the edge of a non-oscillating drum, the lateral movement or shearing action being provided by the following oscillating drum.
Die Flächenelemente können dabei ebene Flächen sein, welche mit der Achse der Siebtrommel einen Winkel etwa zwischen 30o und 60o bilden, oder sie können gekrümmte Flächen sein. Dabei können am Umfang des Schubringes benachbarte Flächenelemente die gleiche Orientierung der Neigung aufweisen oder aber auch abwechselnd entgegengesetzt zueinander geneigt sein.The surface elements can be flat surfaces that form an angle with the axis of the screening drum approximately between 30 o and 60 o , or they can be curved surfaces. In this case, adjacent surface elements on the circumference of the thrust ring can have the same orientation of the inclination or can alternately be inclined in opposite directions to one another.
Die Erfindung macht sich die offenbar bisher bei der Konstruktion von Schubzentrifugen nicht berücksichtigte und nicht erkannte Tatsache zunutze, dass sich bei jeder Entwässerung im Zentrifugalfeld eine von der Granulometrie abhängige Kapillarschicht bildet, welche mehrere Millimeter dick sein kann und welche die Restfeuchte des Schleudergutes beeinflusst. Dadurch dass die schräggestellten Flächenelemente dem Schleudergut zusätzlich zur Bewegungskomponente in Achsenrichtung zum Auslass hin eine Querkomponente in Umfangsrichtung erteilen, wird durch Scherwirkung die unterste Schicht des Schleudergutkuchens zerstört und zur weiteren Entwässerung freigegeben. Der Entwässerungsgrad des Schleudergutes auf dem Transportweg vom Eintrag zum Austrag kann somit ohne Veränderung der Betriebsparameter der Zentrifuge erhöht werden, oder bei einer bestimmten geforderten Endfeuchte kann die Menge des durchgesetzten entwässerten Schleudergutes vergrössert werden, bzw. es kann die Drehzahl gesenkt und damit der Verschleiss herabgesetzt werden.The invention makes use of the fact that has apparently not been taken into account and not recognized in the design of pusher centrifuges that with each dewatering in the centrifugal field a capillary layer is formed which is dependent on the granulometry and which can be several millimeters thick and which influences the residual moisture content of the centrifugal material. Because the inclined surface elements give the centrifugal material a transverse component in the circumferential direction in addition to the movement component in the axial direction towards the outlet, the bottom layer of the centrifugal product cake is destroyed by shearing action and released for further dewatering. The degree of dewatering of the centrifuged material on the transport route from the entry to the discharge can thus be increased without changing the operating parameters of the centrifuge, or the amount of the dewatered centrifuged material which has been passed through can be increased or the speed can be reduced and the wear can be reduced will.
Die Erfindung wird anhand der in den Figuren dargestellten Ausführungsbeispiele näher erläutert. Es zeigen:
- Fig. 1
- eine teilweise aufgeschnittene Schubzentrifuge in perspektivischer Ansicht,
- Fig. 2
- diese Zentrifuge im Schnitt entlang einer die Rotationsachse enthaltenden Schnittebene, und
- Fig. 3 a - d
- vier verschiedene Ausführungsformen von Schubsegmenten.
- Fig. 1
- a partially cut open centrifuge in perspective view,
- Fig. 2
- this centrifuge in section along a section plane containing the axis of rotation, and
- Fig. 3 a - d
- four different embodiments of thrust segments.
Die in den Figuren 1 und 2 in Perspektive und im Schnitt dargestellte Schubzentrifuge weist eine aus zwei rotierbaren, angenähert zylindrischen Siebtrommeln 1 und 2 bestehende Schleudereinheit, ein diese umgebendes feststehendes Zentrifugengehäuse 3, einen an die Schleudereinheit am Auslassende angrenzenden, ein gasförmiges Medium, z.B. Luft, enthaltenden Feststoffraum 4, eine am inneren Ende der Schleudereinheit nahe einem mitrotierenden Schubboden 8 mit einem Schleuderguteinlass 9 mündende Zuführleitung 5 für das zu entwässernde Schleudergut, einen Feststoffauslass 6, und einen Flüssigkeitsraum 7 für die ausgeschleuderte Flüssigkeit auf.The pusher centrifuge shown in FIGS. 1 and 2 in perspective and in section has a centrifugal unit consisting of two rotatable, approximately
Die innere Siebtrommel 1 ist auf einer Welle 10 angebracht, mittels der sie in Rotation mit einer bestimmten Drehzahl versetzt werden kann. Gleichzeitig ist die Welle 10 in Achsenrichtung verschiebbar und vermag mit Hilfe einer nicht dargestellten Antriebsvorrichtung zusätzlich zu ihrer Rotation eine oszillierende Bewegung in Achsenrichtung mit einer gewissen Amplitude auszuführen. Die äussere Siebtrommel 2 ist an einer Hohlwelle 11 befestigt mit welcher sie ebenfalls in Rotation versetzt werden kann, jedoch ohne oszillierende Bewegung in Achsenrichtung. Die Drehzahl der beiden Trommeln 1 und 2 ist dabei identisch.The
Durch das Zuführrohr 5 wird das zu entwässernde Schleudergut in das Innere der innersten Siebtrommel 1 unmittelbar anschliessend an den Schubboden 8 eingebracht und strömt dort radial nach aussen auf die Siebtrommel 1, wo der Entwässerungsprozess beginnt. Durch den Schubboden 8 und über die oszillierende Siebtrommel 1 wird das teilweise entwässerte Schleudergut in Richtung zur anschliessenden äusseren Siebtrommel 2 transportiert und dabei weiter entwässert. Durch das Einlassrohr 5 wird inzwischen weiteres zu entwässerndes Schleudergut kontinuierlich nachgeliefert. Wenn das teilweise entwässerte Schleudergut das Ende der inneren Siebtrommel 1 erreicht, wird es von dessen Rand, welcher als Schubring wirkt, auf die äussere Schleudertrommel 2 transportiert und dort weiter entwässert. Schliesslich wird das fertig entwässerte Schleudergut durch die relative Oszillation der beiden Siebtrommeln 1 und 2 bis zum Feststoffraum 4 transportiert, welchen es über den Feststoffauslass 6 verlässt.The centrifugal material to be dewatered is introduced into the interior of the
Die bisher beschriebenen in Achsenrichtung gegeneinander oszillierenden Elemente 1, 2 und 8 bewirken lediglich eine Bewegungskomponente des Schleudergutes auf den Innenflächen der Siebtrommeln in Achsenrichtung. Es zeigte sich nun überraschenderweise, dass die Entwässerungsleistung deutlich verbessert werden kann, wenn am Schubring zwischen den beiden Siebtrommeln 1 und 2, d.h. an der Aussenkante der inneren Siebtrommel 1 Flächenelemente 12 vorgesehen sind, welche eine gegen die Siebtrommelachsen und damit die Rotationsachse geneigte Schubflächen aufweisen. Solche Schubflächen 12 sind vorteilhafterweise so über den gesamten Schubring verteilt, dass sie die gesamte Innenfläche der äusseren Siebtrommel 2 im wesentlichen überstreichen, sich jedoch möglichst nicht überdecken. Die Neigung der Schubflächen 12 liegt vorteilhafterweise zwischen 30o und 60o, beispielsweise bei 45o. Mit solchen Schubflächen wird erreicht, dass das Schleudergut bei der Oszillation der Siebtrommeln 1 und 2 gegeneinander zusätzlich eine Bewegungskomponente in Umfangsrichtung erhält. Hiermit wird offenbar die sich direkt auf der Innenfläche der Siebtrommel 2 unter Wirkung der ständigen Vorschub-Impulse bildende und den Filtrat-Durchtritt behindernde Kapillarschicht durch Scherwirkung aufgerissen und weitgehend beseitigt, so dass bei gleicher Zentrifugalkraft eine grössere Filtratmenge hindurchtreten kann und die Entwässerungsleistung deutlich verbessert wird.The
Die Erfindung wurde vorstehend anhand einer Schubzentrifuge mit zwei Siebtrommeln und zusätzlichen Schubsegmenten am Rand der inneren Siebtrommel beschrieben. Es versteht sich, dass die erfindungsgemässen Schubsegmente mit analogem Vorteil auch bei Schubzentrifugen mit einer anderen Trommelanzahl vorgesehen sein können, beispielsweise bei Schubzentrifugen mit mehr als zwei Siebtrommeln, an den Aussenrändern der jeweiligen inneren Siebtrommeln.The invention has been described above using a pusher centrifuge with two sieve drums and additional thrust segments on the edge of the inner sieve drum. It goes without saying that the push segments according to the invention can also be provided with an analog advantage in push centrifuges with a different number of drums, for example in push centrifuges with more than two sieve drums, on the outer edges of the respective inner sieve drums.
Ebenso lassen sich analoge Vorteile erreichen, wenn die Schubsegmente nicht, wie im beschriebenen Beispiel dargestellt, als unter ca. 45o gegen die Achse geneigte ebene Flächen ausgebildet sind, sondern in geeigneter anderer Form, wie beispielsweise in den Figuren 3a - 3d dargestellt. Hierbei können die Schubflächen ebene Flächen sein (Fig. 3a und 3b) oder eine Krümmung aufweisen (Fig. 3c und 3d). Andererseits können die Schubflächen am Schubring sämtlich in der gleichen Richtung geneigt sein (Fig. 3a und 3c), oder benachbarte Schubflächen können wechselweise eine entgegengesetzte Neigung aufweisen (Fig. 3b und 3d).Similarly, analogous advantages can be achieved when the thrust segments are not as shown in the example described is formed as below about 45 ° inclined relative to the axis of flat surfaces, but in a suitable other shape, as shown for example in Figures 3a - 3d. The push surfaces can be flat surfaces (FIGS. 3a and 3b) or have a curvature (FIGS. 3c and 3d). On the other hand, the thrust surfaces on the thrust ring can all be inclined in the same direction (FIGS. 3a and 3c), or neighboring thrust surfaces may alternately have an opposite inclination (FIGS. 3b and 3d).
Statt als separat auf den Schubring aufgesetzte schräge Flächen können die Flächenelemente auch durch eine geeignete Ausgestaltung des Schubrandes der entsprechenden Siebtrommel gebildet werden, beispielsweise durch Ausführung des Randes 1' mit sägezahnförmigen Kerben 12', wie in Figur 3a dargestellt. Die Kerben können dabei direkt in den Siebtrommel-Rand gefräst sein, oder durch auf den Rand aufgesetzte, z.B. aufgeschraubte dreieckförmige Segmente gebildet sein. Das Letztere hat den Vorteil, dass bei dem unvermeidlichen Verschleiss des Randes die Segmente leicht ausgetauscht werden können und kein Nacharbeiten des Randes erforderlich ist, so dass die Schubzentrifuge besonders wartungsfreundlich ist und ohne grossen Aufwand stets mit optimaler Leistung betrieben werden kann.Instead of as sloping surfaces placed separately on the thrust ring, the surface elements can also be formed by a suitable design of the thrust edge of the corresponding screening drum, for example by designing the edge 1 'with sawtooth-shaped notches 12', as shown in FIG. 3a. The notches can be milled directly into the edge of the sieve drum, or by placing them on the edge, e.g. screwed triangular segments can be formed. The latter has the advantage that when the edge is inevitably worn, the segments can be easily replaced and no reworking of the edge is required, so that the push centrifuge is particularly easy to maintain and can always be operated with optimum performance without great effort.
Claims (6)
- A pusher centrifuge having at least one inner and one outer at least approximately cylindrical sieve drum (1, 2) which can be rotated in a housing (3) at identical speeds, the sieve drums each performing a movement which oscillates in the axial direction relative to one another, and wherein a solid material to be dewatered can be supplied into the interior of the sieve drums at one end, and with at least one co-rotating pusher plate (8) which is capable of performing a movement oscillating in the axial direction of the sieve drums (1, 2), transporting the at least partially dewatered solid material on the inside of the sieve drums (1, 2) towards a solids outlet (4, 6) provided at the other end of the sieve drum, with a pusher ring (1') being provided on the outlet-side edge of at least one inner sieve drum (1), characterised in that the pusher ring (1') is provided with surface elements (12, 12') which are oriented obliquely to the axis of the sieve drum (1), and which upon the oscillating movement of the inner sieve drum (1) relative to the following sieve drum (2) impart to the solid material which is being transported in the axial direction an additional movement component in the peripheral direction of the sieve drums (1, 2).
- A centrifuge according to Claim 1, characterised in that the surface elements (12) form an angle of between 30° and 60° with the axis of rotation of the sieve drums (1, 2).
- A centrifuge according to one of Claims 1 or 2, characterised in that adjacent surface elements (12) have the same orientation of inclination.
- A centrifuge according to one of Claims 1 or 2, characterised in that adjacent surface elements (12) are inclined alternately in opposite directions to one another.
- A centrifuge according to one of Claims 1 to 4, characterised in that the surface elements (12') are formed by surfaces of notches in the pusher ring (1') of an inner sieve drum (1).
- A centrifuge according to Claim 5, characterised in that the notches are formed by segments (12') having oblique surfaces which are placed on the edge of the sieve drum (1').
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH834/88 | 1988-03-07 | ||
| CH834/88A CH675374A5 (en) | 1988-03-07 | 1988-03-07 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0331924A2 EP0331924A2 (en) | 1989-09-13 |
| EP0331924A3 EP0331924A3 (en) | 1990-03-21 |
| EP0331924B1 true EP0331924B1 (en) | 1992-12-23 |
Family
ID=4196283
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP89102291A Expired - Lifetime EP0331924B1 (en) | 1988-03-07 | 1989-02-10 | Pusher centrifuge |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US4889627A (en) |
| EP (1) | EP0331924B1 (en) |
| JP (1) | JPH0624648B2 (en) |
| CN (1) | CN1017407B (en) |
| BR (1) | BR8900818A (en) |
| CH (1) | CH675374A5 (en) |
| DE (2) | DE3810565C1 (en) |
| ES (1) | ES2037888T3 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH679016A5 (en) * | 1989-09-29 | 1991-12-13 | Escher Wyss Ag | |
| US5401423A (en) * | 1991-11-27 | 1995-03-28 | Baker Hughes Incorporated | Feed accelerator system including accelerator disc |
| AU3228693A (en) * | 1991-11-27 | 1993-06-28 | Baker Hughes Incorporated | Feed accelerator system including feed slurry accelerating nozzle apparatus |
| US5380266A (en) * | 1991-11-27 | 1995-01-10 | Baker Hughes Incorporated | Feed accelerator system including accelerator cone |
| AU3324793A (en) * | 1991-12-31 | 1993-07-28 | Baker Hughes Incorporated | Feed accelerator system including accelerating vane apparatus |
| US5948256A (en) * | 1997-08-22 | 1999-09-07 | Baker Hughes Incorporated | Centrifuge with cake churning |
| EP2913112B1 (en) | 2014-02-26 | 2020-06-17 | Ferrum AG | Centrifuge, and method for loading a centrifuge |
| ES2698377T3 (en) * | 2014-06-24 | 2019-02-04 | Ferrum Ag | Centrífuga of double empujador as well as device of base of empujador |
| KR102504657B1 (en) * | 2019-11-18 | 2023-02-27 | 주식회사 엘지화학 | Pressurizing centrifugal dehydrator |
Family Cites Families (8)
| 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 | |
| DE1089686B (en) * | 1958-06-06 | 1960-09-22 | Karl Marx Stadt Maschf | Pusher centrifuge with a conical drum |
| DE1120379B (en) * | 1959-06-13 | 1961-12-21 | Julius Von Roetel | Continuously working sieve centrifuge |
| DE1219407B (en) * | 1961-04-28 | 1966-06-16 | Toru Iono | Pusher centrifuge |
| FR1295577A (en) * | 1961-04-28 | 1962-06-08 | Centrifugal filters | |
| DE2407833A1 (en) * | 1974-02-19 | 1975-08-21 | Eberhard Dipl Ing Simon | Centrifuge for suspensions - having a longitudinally movable plough co-axially mounted inside the drum to remove sepd. solids |
| CH624858A5 (en) * | 1977-11-25 | 1981-08-31 | Escher Wyss Ag | |
| CH627376A5 (en) * | 1977-12-07 | 1982-01-15 | Escher Wyss Ag | CENTRIFUGE WITH A SOLID SPACE CONTAINING A GASEOUS MEDIUM. |
-
1988
- 1988-03-07 CH CH834/88A patent/CH675374A5/de not_active IP Right Cessation
- 1988-03-29 DE DE3810565A patent/DE3810565C1/de not_active Expired
-
1989
- 1989-02-10 ES ES198989102291T patent/ES2037888T3/en not_active Expired - Lifetime
- 1989-02-10 DE DE8989102291T patent/DE58903062D1/en not_active Expired - Fee Related
- 1989-02-10 EP EP89102291A patent/EP0331924B1/en not_active Expired - Lifetime
- 1989-02-23 BR BR898900818A patent/BR8900818A/en not_active IP Right Cessation
- 1989-02-23 US US07/314,195 patent/US4889627A/en not_active Expired - Fee Related
- 1989-03-07 JP JP1053075A patent/JPH0624648B2/en not_active Expired - Lifetime
- 1989-03-07 CN CN89101210.9A patent/CN1017407B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| EP0331924A2 (en) | 1989-09-13 |
| BR8900818A (en) | 1989-10-17 |
| EP0331924A3 (en) | 1990-03-21 |
| CH675374A5 (en) | 1990-09-28 |
| JPH01274856A (en) | 1989-11-02 |
| JPH0624648B2 (en) | 1994-04-06 |
| ES2037888T3 (en) | 1993-07-01 |
| CN1036714A (en) | 1989-11-01 |
| CN1017407B (en) | 1992-07-15 |
| DE3810565C1 (en) | 1989-07-13 |
| DE58903062D1 (en) | 1993-02-04 |
| US4889627A (en) | 1989-12-26 |
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