EP2326427A1 - Centrifuge with a self-emptying centrifuge drum - Google Patents

Centrifuge with a self-emptying centrifuge drum

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Publication number
EP2326427A1
EP2326427A1 EP09783343A EP09783343A EP2326427A1 EP 2326427 A1 EP2326427 A1 EP 2326427A1 EP 09783343 A EP09783343 A EP 09783343A EP 09783343 A EP09783343 A EP 09783343A EP 2326427 A1 EP2326427 A1 EP 2326427A1
Authority
EP
European Patent Office
Prior art keywords
closing chamber
recesses
centrifuge according
closing
drum
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP09783343A
Other languages
German (de)
French (fr)
Other versions
EP2326427B1 (en
Inventor
Wilfried Mackel
Helga Tietz
Bernd Terwey
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GEA Mechanical Equipment GmbH
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GEA Mechanical Equipment GmbH
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Filing date
Publication date
Application filed by GEA Mechanical Equipment GmbH filed Critical GEA Mechanical Equipment GmbH
Publication of EP2326427A1 publication Critical patent/EP2326427A1/en
Application granted granted Critical
Publication of EP2326427B1 publication Critical patent/EP2326427B1/en
Active legal-status Critical Current
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
    • B04B1/10—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles with discharging outlets in the plane of the maximum diameter of the bowl
    • B04B1/14—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles with discharging outlets in the plane of the maximum diameter of the bowl with periodical discharge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
    • B04B1/10—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles with discharging outlets in the plane of the maximum diameter of the bowl
    • B04B1/14—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles with discharging outlets in the plane of the maximum diameter of the bowl with periodical discharge
    • B04B1/16—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles with discharging outlets in the plane of the maximum diameter of the bowl with periodical discharge with discharging outlets controlled by the rotational speed of the bowl
    • B04B1/18—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles with discharging outlets in the plane of the maximum diameter of the bowl with periodical discharge with discharging outlets controlled by the rotational speed of the bowl controlled by the centrifugal force of an auxiliary liquid

Definitions

  • the invention relates to a centrifuge with a self-emptying centrifugal drum according to the preamble of claim 1.
  • a centrifuge with a self-cleaning centrifugal drum is known from DE-OS 19 09 996. Further developed constructions are shown in DE 32 08 808 A1, 32 40 093 A1, DE 35 09 139 C1, DE 35 24 731 C1 and DE 36 07 526 A1. Although these solutions - known under the name Hydrostop - can be used to precisely control partial discharges in particular, they are relatively complex constructions in each case.
  • the object of the invention is to create a centrifuge optimized with regard to its emptying behavior with simple structural means.
  • the construction according to the invention achieves an optimized emptying behavior with simple constructional means, which is in particular due to a rapidly initiated and relatively large evacuation stroke and a rapidly initiated one Signs closing, which leads to a rapid reduction of Austragsspalt- height.
  • FIG. 1 shows a section through a portion of a centrifugal drum according to the invention.
  • FIG. 2 is a diagram showing the stroke of the piston slide over time with a centrifugal drum of the type of Figure 1;
  • Fig. 3 is a diagram showing the stroke of the piston slide over time with a known centrifugal drum; and
  • FIG. 4 shows a further section according to the invention, shown schematically in section
  • a material to be processed - a solid-liquid mixture - is fed through a central inlet 22 (see insofar as the schematically illustrated construction of FIG. 4) to a rotatable drum 1 of a (plate) separator with a vertical axis of rotation, which has a centrifugal space 2 which is divided into a separation space 3 and a solid space 4.
  • the solid space 4 is bounded on one side - here downwards - by an axially movable piston slide 5, which releases or closes ejection openings 7 for the solids during its axial movements in the drum shell 6.
  • a closing chamber 8 which can be acted upon with closing fluid is formed.
  • closing liquid can be introduced through an injection chamber 9 and a supply line.
  • This closing fluid can be switched by one or more leads 11, in which one or more piston valves 12 are discharged from the drum 1, to which the piston valve 12 is acted upon by opening water, which is passed through an injection chamber 13 for opening water and a supply line 14 to the piston valve 12.
  • the function of such a piston valve 12 is known per se in the field of self-draining separators.
  • Opening water and closing water are sprayed by means of control water supply lines 22a, b through two separate water supply lines into the injection chambers 13 and 9, respectively, into the drum.
  • valve piston moves outward (by the centrifugal force) and closes the bore 11.
  • the spool 5 moves up again , which closes the drum 1.
  • the closing chamber height that is to say the distance between the inner wall of the drum and the spool in the region of the closing chamber 8, is kept relatively low, preferably the height is 0.3 mm to 5 mm, in particular 0.5 to 1.5 mm.
  • the volume of closed water is kept low.
  • the height of the chamber significantly affects the rate of evacuation.
  • a defined increment of the closing chamber 8 is set to a predetermined diameter of the closing chamber.
  • the height of the closing chamber 8 preferably multiplies in the region of this increment, preferably the height of the closing chamber 8 in the region of the recesses 17 is three to fifteen times the gap height of the closing chamber 8 in the area adjacent to or outside of the recesses 17, in particular 3 to 20 mm, more preferably 5 to 12 mm, in particular 10 mm.
  • this increment is introduced in the region of the lower part of the piston slide.
  • This reversal range of the angle of the spool is usually - viewed from the outside diameter of the spool - between one third and two thirds of its radius.
  • the spool has here on its underside in its inner and outer edge region circumference sokocarditch 20, 21 for better acceptance and for better removal of the closing water.
  • the invention can be realized, for example, in a simple manner by inserting recesses 17 on a certain diameter into the side of the piston slide 6 facing the closing chamber, for example two or more circumferentially distributed cutouts.
  • the recesses 17 lead to an optimized emptying behavior, as shown by way of example in FIG. 2.
  • results from the gap broadening in the recesses 17 - which may be designed, for example, as recesses - an au automatic and at the beginning of the closing process very fast closing behavior, except for a small residual gap.
  • the recesses 17 also increase the insensitivity to valve timing variations, so that even a metering piston, which serves to adjust and control of partial discharges, can be dispensed with, which reduces the cost of construction over known solutions.
  • the cut-outs 17 are designed according to the type of product to be processed and the emptying (partial emptying) to be performed, which may for example be carried out empirically with the aid of experiments, until a characteristic of the type of FIG. 2 with a relatively large, fast to a maximum value increasing opening stroke and a relatively fast stopping the emptying results.
  • the piston slide of FIG. 1 has, starting from a radius R17 in the region of the cutouts radially inwardly and outwardly double conical shape, wherein the cutouts 17 are formed in the transition region 17 between the two conical regions 18 and 19 by way of example as two variants ,
  • the comparison of the discharge characteristics as shown in Figs. 2 and 3 was carried out by way of example with a separator of the type MSD 300 of the applicant.
  • the lifting height of 100% refers to the mechanically realizable possibility of movement of the piston slide between the drum cover and the drum base.
  • the time base of, for example, 1 sec refers to the control of the upstream solenoid valve for supplying the opening water.

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  • Centrifugal Separators (AREA)

Abstract

A centrifuge with a self-emptying centrifuge drum, with discharge openings (7) designed into the drum shell (6) thereof, said openings exiting from a solids chamber (4) and being closable by way of an axially moving piston slide (6), wherein a closing chamber (8) to which closing fluid can be applied is associated with the piston slide (5), said chamber is capable of being emptied by actuating one or more hydraulic valves (12) using opening fluid, wherein the closing chamber (8) comprises at least one or more recesses (17), in the proximity of which the closing chamber (8) has a larger closing chamber height than in the remaining area thereof outside the recesses (17).

Description

Zentrifuge mit einer selbstentleerenden Schleudertrommel Centrifuge with a self-cleaning centrifugal drum
Die Erfindung betrifft eine Zentrifuge mit einer selbstentleerenden Schleudertrom- mel nach dem Oberbegriff des Anspruchs 1.The invention relates to a centrifuge with a self-emptying centrifugal drum according to the preamble of claim 1.
Eine Zentrifuge mit einer selbstentleerenden Schleudertrommel ist aus der DE-OS 19 09 996 bekannt. Weiterentwickelte Konstruktionen zeigen die DE 32 08 808 Al, die 32 40 093 Al, die DE 35 09 139 Cl, die DE 35 24 731 Cl und die DE 36 07 526 Al. Mit diesen - unter dem Namen Hydrostop bekannten - Lösungen lassen sich zwar insbesondere Teilentleerungen präzise steuern, es handelt sich aber um jeweils relativ aufwändige Konstruktionen.A centrifuge with a self-cleaning centrifugal drum is known from DE-OS 19 09 996. Further developed constructions are shown in DE 32 08 808 A1, 32 40 093 A1, DE 35 09 139 C1, DE 35 24 731 C1 and DE 36 07 526 A1. Although these solutions - known under the name Hydrostop - can be used to precisely control partial discharges in particular, they are relatively complex constructions in each case.
Es ist auch bekannt, Kolbenventile zum zeitweisen Öffnen einer Schließkammer mit Hilfe einer außerhalb der Trommel angeordneten Dosiereinrichtung anzusteuern. Das Entleerung s verhalten derartiger Konstruktionen ist aber trotz der Dosiergeräte nicht immer optimal, da kein sehr großer Öffnungshub des Kolbenschiebers erreicht wird (siehe Fig. 3). Zudem bedingen die eingesetzten Dosiereinrichtungen einen erhöhten Kostenaufwand.It is also known to control piston valves for the temporary opening of a closing chamber by means of a metering device arranged outside the drum. The emptying behavior of such constructions, however, is not always optimal, despite the metering devices, since no very large opening stroke of the piston valve is achieved (see FIG. 3). In addition, the dosing devices used require an increased cost.
Wünschenswert ist insofern ein schneller und auch großer Öffnungshub des Kolbenschiebers, um einen guten und gleichmäßigen Feststoffaustrag auch bei der Verarbeitung von weniger fließfähigen Feststoffen zu ermöglichen.In this respect, it is desirable to have a fast and also large opening stroke of the spool valve in order to enable a good and uniform discharge of solids even when processing less free-flowing solids.
Die Erfindung hat vor diesem Hintergrund die Aufgabe, mit einfachen konstruktiven Mitteln eine hinsichtlich ihres Entleerungsverhaltens optimierte Zentrifuge zu schaffen.Against this background, the object of the invention is to create a centrifuge optimized with regard to its emptying behavior with simple structural means.
Die Erfindung löst diese Aufgabe durch den Gegenstand des Anspruchs 1.The invention solves this problem by the subject matter of claim 1.
Die erfindungsgemäße Konstruktion erreicht mit einfachen konstruktiven Mitteln ein optimiertes Entleerungsverhalten, das sich insbesondere durch einen schnell eingeleiteten und relativ großen Entleerungshub und einen schnell eingeleiteten Schließvorgang auszeichnet, der zu einer raschen Verkleinerung der Austragsspalt- höhe führt.The construction according to the invention achieves an optimized emptying behavior with simple constructional means, which is in particular due to a rapidly initiated and relatively large evacuation stroke and a rapidly initiated one Signs closing, which leads to a rapid reduction of Austragsspalt- height.
Vorteilhafte Ausgestaltungen der Erfindung sind den Unteransprüchen zu entneh- men.Advantageous embodiments of the invention can be found in the subclaims.
Nachfolgend wird die Erfindung unter Bezug auf die Zeichnung näher beschrieben. Es zeigen:The invention will be described in more detail with reference to the drawing. Show it:
Fig. 1 einen Schnitt durch einen Teilbereich einer erfindungsgemäßen Schleudertrommel;1 shows a section through a portion of a centrifugal drum according to the invention.
Fig. 2 ein Diagramm, welches den Hub des Kolben Schiebers über die Zeit mit einer Schleudertrommel nach Art der Fig. 1 darstellt; Fig. 3 ein Diagramm, welches den Hub des Kolben Schiebers über die Zeit mit einer bekannten Schleudertrommel darstellt; und Fig. 4 eine schematisch schnittartig dargestellte, weitere erfindungsgemäßeFig. 2 is a diagram showing the stroke of the piston slide over time with a centrifugal drum of the type of Figure 1; Fig. 3 is a diagram showing the stroke of the piston slide over time with a known centrifugal drum; and FIG. 4 shows a further section according to the invention, shown schematically in section
S chleudertro mmel .Slinging screw.
Ein zu verarbeitendes Schleudergut - ein Feststoff-Flüssigkeitsgemisch - wird durch einen mittigen Einlauf 22 (siehe insoweit die schematisch dargestellte Kon- struktion der Fig. 4) einer drehbaren Trommel 1 eines (Teller-)Separators mit vertikaler Drehachse zugeführt, die einen Schleuderraum 2 aufweist, der sich in einen Trennraum 3 und einen Feststoffraum 4 unterteilt.A material to be processed - a solid-liquid mixture - is fed through a central inlet 22 (see insofar as the schematically illustrated construction of FIG. 4) to a rotatable drum 1 of a (plate) separator with a vertical axis of rotation, which has a centrifugal space 2 which is divided into a separation space 3 and a solid space 4.
Der Feststoffraum 4 wird einseitig - hier nach unten hin - von einem axial bewegli- chen Kolbenschieber 5 begrenzt, der bei seinen axialen Bewegungen im Trommelmantel 6 ausgebildete Auswurföffnungen 7 für die Feststoffe freigibt bzw. verschließt.The solid space 4 is bounded on one side - here downwards - by an axially movable piston slide 5, which releases or closes ejection openings 7 for the solids during its axial movements in the drum shell 6.
Zwischen dem Kolbenschieber 5 und dem Trommelmantel 6 bzw. dem Trommelun- terteil ist eine mit Schließfluid beaufschlagbare Schließkammer 8 ausgebildet.Between the piston slide 5 and the drum shell 6 or the drum base part, a closing chamber 8 which can be acted upon with closing fluid is formed.
In die Schließkammer 8 kann durch eine Einspritzkammer 9 und eine Zuleitung 10 Schließflüssigkeit eingeleitet werden. Diese Schließflüssigkeit kann durch eine oder mehrere Ableitungen 11, in die eines oder mehrere Kolbenventile 12 geschaltet sind, aus der Trommel 1 abgelassen werden, wozu das Kolbenventil 12 mit Öffnungswasser beaufschlagt wird, welches durch eine Einspritzkammer 13 für Öffnungswasser und eine Zuleitung 14 zum Kolbenventil 12 geleitet wird. Die Funktion eines solchen Kolbenventils 12 ist im Bereich selbstentleerender Separatoren an sich bekannt.In the closing chamber 8 10 closing liquid can be introduced through an injection chamber 9 and a supply line. This closing fluid can be switched by one or more leads 11, in which one or more piston valves 12 are discharged from the drum 1, to which the piston valve 12 is acted upon by opening water, which is passed through an injection chamber 13 for opening water and a supply line 14 to the piston valve 12. The function of such a piston valve 12 is known per se in the field of self-draining separators.
Zum Durchführen einer Entleerung wird Öffnungswasser eingespritzt, welches den Ventilkolben 16 des Kolbenventils 12 verschiebt, so dass das Schließwasser aus der Schließ was seröffnung 15 über die Bohrung 11 und das Ventil 12 ablaufen kann.To perform an emptying opening water is injected, which moves the valve piston 16 of the piston valve 12, so that the closing water from the closing water seröffnung 15 via the bore 11 and the valve 12 can run.
Je nach Zeitdauer der Öffnungswasserzugabe bzw. je nach Öffnungswassermenge (zugeführt über einen Dosierkolben oder über eine Zeitsteuerung der Öffnung des Zuleitungsventils) entleert die Schließkammer 8 ganz oder teilweise und der Kolbenschieber 5 bewegt sich durch die Druckkraft im Trennraum 3, welche durch das Produkt in der Trommel und die Zentrifugalwirkung erzeugt wird, nach unten und öffnet die Trommel 1.Depending on the duration of the opening water addition or depending on the amount of opening water (supplied via a metering or a timing of the opening of the supply valve) empties the closing chamber 8 wholly or partially and the spool 5 moves through the pressure force in the separation chamber 3, which by the product in the Drum and the centrifugal action is generated, down and opens the drum. 1
Öffnungswasser und Schließwasser werden mittels Steuerwasserzuführungen 22a, b durch zwei getrennte Wasserzuleitungen in die Einspritzkammern 13 bzw. 9 in die Trommel gespritzt.Opening water and closing water are sprayed by means of control water supply lines 22a, b through two separate water supply lines into the injection chambers 13 and 9, respectively, into the drum.
Wenn kein Öffnungswasser mehr zugeführt wird, bewegt sich der Ventilkolben nach außen (durch die Zentrifugalkraft) und verschließt die Bohrung 11. Wird die Öffnungskraft schließlich kleiner als die Schließkraft in der Schließkammer 8, in welche Schließwasser eingespritzt wird, bewegt sich der Kolbenschieber 5 wieder aufwärts, was die Trommel 1 verschließt.When no more opening water is supplied, the valve piston moves outward (by the centrifugal force) and closes the bore 11. When the opening force is finally smaller than the closing force in the closing chamber 8, in which closing water is injected, the spool 5 moves up again , which closes the drum 1.
Erfindungsgemäß wird die Schließkammerhöhe, d.h der Abstand zwischen der Trommelinnenwand und dem Kolbenschieber im Bereich der Schließkammer 8, relativ gering gehalten, vorzugsweise beträgt die Höhe 0,3 mm bis 5mm, insbesondere 0,5 bis 1,5 mm.According to the invention, the closing chamber height, that is to say the distance between the inner wall of the drum and the spool in the region of the closing chamber 8, is kept relatively low, preferably the height is 0.3 mm to 5 mm, in particular 0.5 to 1.5 mm.
Hierdurch wird auch das Schließwasservolumen gering gehalten. Die Höhe der Kammer beeinflusst die Geschwindigkeit der Entleerung signifikant. Um dennoch einen relativ großen Entleerungshub zu erhalten und um zu einem schnellen Öffnungsvorgang zu Beginn der Entleerung und zu einem schnellen Schließvorgang gegen Ende der Entleerung zu gelangen, wird dabei aber ein definierter Stufensprung der Schließkammer 8 auf einem vorgegebenen Durchmesser der Schließkammer festgelegt. Im Bereich dieses Stufensprunges vervielfacht sich vorzugsweise die Höhe der Schließkammer 8, vorzugsweise beträgt die Höhe der Schließkammer 8 im Bereich der Ausnehmungen 17 nach Versuchen das drei- bis fünfzehnfache der Spalthöhe der Schließkammer 8 im Bereich neben bzw. außerhalb der Ausnehmungen 17, insbesondere 3 bis 20 mm, besonders vorteilhaft 5 bis 12 mm, insbesondere 10 mm.As a result, the volume of closed water is kept low. The height of the chamber significantly affects the rate of evacuation. In order nevertheless to obtain a relatively large evacuation stroke and to arrive at a rapid opening operation at the beginning of emptying and a fast closing operation towards the end of emptying, but a defined increment of the closing chamber 8 is set to a predetermined diameter of the closing chamber. The height of the closing chamber 8 preferably multiplies in the region of this increment, preferably the height of the closing chamber 8 in the region of the recesses 17 is three to fifteen times the gap height of the closing chamber 8 in the area adjacent to or outside of the recesses 17, in particular 3 to 20 mm, more preferably 5 to 12 mm, in particular 10 mm.
Vorzugsweise wird dieser Stufensprung im Bereich des unteren Teiles des Kolbenschiebers eingebracht. Dieser Umkehrbereich des Winkels des Kolbenschiebers liegt in der Regel - vom Außendurchmesser des Kolbenschiebers aus betrachtet - zwischen einem Drittel und zwei Drittel seines Radius.Preferably, this increment is introduced in the region of the lower part of the piston slide. This reversal range of the angle of the spool is usually - viewed from the outside diameter of the spool - between one third and two thirds of its radius.
Zusätzlich weist der Kolbenschieber hier an seiner Unterseite in seinem inneren und äußeren Randbereich Umfang sfreidrehungen 20, 21 zur besseren Annahme und zum besseren Abfuhr des Schließwassers auf.In addition, the spool has here on its underside in its inner and outer edge region circumference sfreidrehungen 20, 21 for better acceptance and for better removal of the closing water.
Die Erfindung lässt sich beispielsweise auf einfache Weise dadurch realisieren, dass in die der Schließkammer zugewandte Seite des Kolbenschiebers 6 auf einem bestimmten Durchmesser Ausnehmungen 17 eingebracht werden, beispielsweise zwei oder mehr umfang s verteilte Ausfräsungen. Die Ausnehmungen 17 führen zu einem optimierten Entleerungsverhalten, wie es beispielhaft in Fig. 2 abgebildet ist.The invention can be realized, for example, in a simple manner by inserting recesses 17 on a certain diameter into the side of the piston slide 6 facing the closing chamber, for example two or more circumferentially distributed cutouts. The recesses 17 lead to an optimized emptying behavior, as shown by way of example in FIG. 2.
Wie aus der Fig. 2 ersichtlich, ergibt sich durch den schmalen Spaltraum im inneren radialen Bereich der Schließkammer 8 bei der gewählten beispielhaften Auslegung für eine Trommel 1, die einen Böschungswinkel α von 15° aufweist, zu Beginn der Entleerung ein deutlich vergrößerter Entleerungshub und ein schneller Öffnungsvorgang.As can be seen from FIG. 2, as a result of the narrow gap in the inner radial region of the closing chamber 8 in the selected exemplary design for a drum 1, which has an angle of repose α of 15 °, at the beginning of the emptying a significantly increased emptying stroke and a fast opening process.
Darüber hinaus ergibt sich durch die Spaltverbreiterung im Bereich der Ausnehmungen 17 - die beispielsweise als Ausfräsungen ausgelegt sein können - ein au- tomatisches und zu Beginn des Schließvorganges sehr schnelles Schließverhalten, bis auf einen geringen Restspalt.In addition, results from the gap broadening in the recesses 17 - which may be designed, for example, as recesses - an au automatic and at the beginning of the closing process very fast closing behavior, except for a small residual gap.
Durch eine geeignete Auslegung - bzw. Variation - des Schließspaltes und der Ausnehmungen 17 kann somit die Entleerungscharakteristik bzgl. der Entleerungsgeschwindigkeit und der Entleerungsmenge gezielt eingestellt werden.By a suitable design - or variation - of the closing gap and the recesses 17 thus the emptying characteristic with respect. The emptying speed and the emptying amount can be adjusted specifically.
Die Ausfräsungen 17 erhöhen zudem die Unempfindlichkeit gegen Ventilsteuerzeitschwankungen, so dass sogar auf einen Dosierkolben, der zur Einstellung und Steu- erung von Teilentleerungen dient, verzichtet werden kann, was die Kosten der Konstruktion gegenüber bekannten Lösungen senkt.The recesses 17 also increase the insensitivity to valve timing variations, so that even a metering piston, which serves to adjust and control of partial discharges, can be dispensed with, which reduces the cost of construction over known solutions.
Die Ausfräsungen 17 werden je nach Art der zu verarbeitenden Produktes und der durchzuführenden Entleerungen (Teilentleerungsmenge) ausgelegt, was beispiels- weise empirisch mit Hilfe durch Versuche erfolgen kann, bis sich eine Charakteristik nach Art der Fig. 2 mit einem relativ großen, schnell auf einen maximalen Wert ansteigenden Öffnungshub und einem relativ schnellen Stoppen der Entleerung ergibt.The cut-outs 17 are designed according to the type of product to be processed and the emptying (partial emptying) to be performed, which may for example be carried out empirically with the aid of experiments, until a characteristic of the type of FIG. 2 with a relatively large, fast to a maximum value increasing opening stroke and a relatively fast stopping the emptying results.
Die einmal ermittelte Charakteristik des Öffnungsweges und der Teilentleerungsmenge wird reproduzierbar erreicht. Gewünschte Veränderungen können durch ein Anpassen der Ausnehmung 17 und deren Volumen erreicht werden. Der Kolben Schieber der Fig. 1 weist ausgehend von einem Radius R17 im Bereich der Ausfräsungen radial nach innen und nach außen hin doppelt konische Form auf, wobei die Ausfräsungen 17 im Übergangsbereich 17 zwischen den beiden konischen Bereichen 18 und 19 beispielhaft als zwei Varianten ausgebildet sind.Once determined characteristic of the opening path and the Teilentleerungsmenge is achieved reproducibly. Desired changes can be achieved by adjusting the recess 17 and its volume. The piston slide of FIG. 1 has, starting from a radius R17 in the region of the cutouts radially inwardly and outwardly double conical shape, wherein the cutouts 17 are formed in the transition region 17 between the two conical regions 18 and 19 by way of example as two variants ,
Es wäre auch denkbar, nur eine Ausfräsung vorzusehen und diese als eine umlaufende Ringnut auszubilden. Aus Stabilitätsgründen und in Hinsicht auf eine beson- ders optimale Entleeruδngscharakteristik ist es aber vorteilhaft, zwischen den umfang s verteilten Ausfräsungen 17 auch Bereiche des Kolbenschiebers stehenzulassen, in denen die Wanddicke des Kolben Schiebers nicht durch die eine oder mehreren Ausnehmungen 17 geschwächt ist. Wenn die Ausfräsung(en) 17 im Kolbenschieber weiter außen liegt bzw. liegen, so vergrößert sich die Austragsmenge des Feststoffes bei der Teilentleerung. Liegt die Position weiter innen, verkleinert sich die Austragsmenge bei gleicher Ventilöffnungszeit.It would also be conceivable to provide only one cutout and to form this as a circumferential annular groove. For reasons of stability and in view of a particularly optimal emptying characteristic, it is advantageous to leave regions of the piston slide between the circumferentially distributed cutouts 17 in which the wall thickness of the piston slide is not weakened by the one or more recesses 17. If the cutout (s) 17 in the piston valve is located farther out or, so increases the discharge of the solid at the partial emptying. If the position is further inside, the discharge volume decreases with the same valve opening time.
Der Vergleich der Entleerungscharakteristiken, wie er in Fig. 2 und 3 dargestellt ist, wurde beispielhaft mit einem Separator vom Typ MSD 300 der Anmelderin durchgeführt. Die Hubhöhe von 100% bezieht sich auf die mechanisch realisierbare Bewegungsmöglichkeit des Kolbenschiebers zwischen dem Trommeldeckel und dem Trommelunterteil. Die Zeitbasis von beispielsweise 1 sec bezieht sich auf die Ansteuerung des vorgeschalteten Magnetventils zur Zuführung des Öffnungswassers. The comparison of the discharge characteristics as shown in Figs. 2 and 3 was carried out by way of example with a separator of the type MSD 300 of the applicant. The lifting height of 100% refers to the mechanically realizable possibility of movement of the piston slide between the drum cover and the drum base. The time base of, for example, 1 sec refers to the control of the upstream solenoid valve for supplying the opening water.
Bezugszeichenreference numeral
Trommel 1Drum 1
Schleuderraum 2Centrifugal space 2
Trennraum 3Separation space 3
Feststoffraum 4Solid space 4
Kolbenschieber 5Piston slide 5
Trommelmantel 6Drum casing 6
Auswurföffnungen 7Ejection openings 7
Schließkammer 8Locking chamber 8
Einspritzkammer 9Injection chamber 9
Zuleitung 10Supply line 10
Ableitungen 11Derivatives 11
Kolbenventile 12Piston valves 12
Einspritzkammer 13Injection chamber 13
Kanal 14Channel 14
Schließwasseröffnung 15Closing water opening 15
Ventilkolben 16Valve piston 16
Ausnehmung 17 konische Bereiche 18, 19Recess 17 conical areas 18, 19
Umfangsfreidrehungen 20, 21Circumferential free twists 20, 21
Steuerwasserzuführung 22a, b Control water supply 22a, b

Claims

Ansprüche claims
1. Zentrifuge mit einer selbstentleerenden Schleudertrommel, in deren Trommelmantel (6) von einem Feststoffraum (4) ausgehende, durch einen axial beweglichen Kolbenschieber (6) verschließbare Auswurföffnungen1. centrifuge with a self-cleaning centrifugal drum, in the drum shell (6) of a solid space (4) outgoing, by an axially movable spool (6) closable ejection openings
(7) ausgebildet sind, wobei dem Kolbenschieber (5) ferner eine mit Schließflüssigkeit beaufschlagbare Schließkammer (8) zugeordnet ist, die durch Betätigung eines oder mehrerer Hydraulikventile (12) mit Hilfe von Öffnungsflüssigkeit entleerbar ist, dadurch gekennzeichnet, dass die Schließkammer (8) wenigstens eine oder mehrere Ausnehmungen (17) aufweist, in deren Bereich die Schließkammer (8) eine größere Schließkammerhöhe aufweist als in ihrem übrigen Bereich außerhalb der Ausnehmungen (17).(7) are formed, wherein the piston valve (5) is further associated with a closing liquid acted upon lock chamber (8) which is emptied by actuation of one or more hydraulic valves (12) by means of opening fluid, characterized in that the closing chamber (8) at least one or more recesses (17), in whose area the closing chamber (8) has a larger closing chamber height than in its remaining area outside the recesses (17).
2. Zentrifuge nach Anspruch 1, dadurch gekennzeichnet, dass die Ausnehmungen (17) als Aussparungen in der der Schließkammer zugewandten Seite des Kolbenschiebers (5) ausgebildet sind.2. Centrifuge according to claim 1, characterized in that the recesses (17) are formed as recesses in the closing chamber facing side of the piston slide (5).
3. Zentrifuge nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Hydraulikventile als Kolbenventile (12) ausgebildet sind.3. Centrifuge according to claim 1 or 2, characterized in that the hydraulic valves are designed as piston valves (12).
4. Zentrifuge nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass in die der Schließkammer zugewandte Seite des Kolbenschiebers (6) auf einem bestimmten Durchmesser umfang s verteilt die ei- ne oder mehreren Ausnehmungen (17) eingebracht sind.4. Centrifuge according to one of the preceding claims, characterized in that in the closing chamber facing side of the spool (6) on a certain diameter circumferentially distributed s one or more recesses (17) are introduced.
5. Zentrifuge nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass in die der Schließkammer zugewandte Seite des Kolbenschiebers umfang s verteilte Ausfräsungen (17) eingebracht sind.5. Centrifuge according to one of the preceding claims, characterized in that in the closing chamber facing side of the spool circumferentially distributed milled recesses (17) are introduced.
6. Zentrifuge nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass der Kolbenschieber (5) eine radial nach innen und nach außen hin doppelt konische Form aufweist. 6. Centrifuge according to one of the preceding claims, characterized in that the piston slide (5) has a radially inwardly and outwardly double conical shape.
7. Zentrifuge nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Ausfräsungen (17) im Übergangsbereich zwischen den beiden konischen Bereichen (18 und 19) ausgebildet sind.7. Centrifuge according to one of the preceding claims, characterized in that the cut-outs (17) in the transition region between the two conical regions (18 and 19) are formed.
8. Zentrifuge nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die wenigstens eine Ausnehmung (17) als umlaufende Ringnut ausgebildet ist.8. Centrifuge according to one of the preceding claims, characterized in that the at least one recess (17) is designed as a circumferential annular groove.
9. Zentrifuge nach einem der vorstehenden Ansprüche, dadurch gekenn- zeichnet, dass die Schließkammerhöhe, d.h. der Abstand zwischen der9. Centrifuge according to one of the preceding claims, characterized in that the closing chamber height, i. the distance between the
Trommelinnenwand und dem Kolbenschieber, im Bereich der Schließkammer (8) bei 0,3 bis 5 mm liegt.Drum inner wall and the piston valve, in the region of the closing chamber (8) is 0.3 to 5 mm.
10. Zentrifuge nach einem der vorstehenden Ansprüche, dadurch gekenn- zeichnet, dass die Schließkammerhöhe, d.h. der Abstand zwischen der10. Centrifuge according to one of the preceding claims, characterized in that the closing chamber height, i. the distance between the
Trommelinnenwand und dem Kolbenschieber, im Bereich der Schließkammer (8) bei 0,5 bis 1, 5 mm liegt.Drum inner wall and the piston valve, in the region of the closing chamber (8) is 0.5 to 1, 5 mm.
11. Zentrifuge nach einem der vorstehenden Ansprüche, dadurch gekenn- zeichnet, dass die Schließkammerhöhe, d.h. der Abstand zwischen der11. Centrifuge according to one of the preceding claims, characterized in that the closing chamber height, i. the distance between the
Trommelinnenwand und dem Kolbenschieber, im Bereich der Ausnehmungen (8) bei 3 bis 20mm, insbesondere bei 5 bis 12 mm liegt.Drum inner wall and the piston valve, in the region of the recesses (8) at 3 to 20mm, in particular at 5 to 12 mm.
12. Zentrifuge nach einem der vorstehenden Ansprüche, dadurch gekenn- zeichnet, dass die Höhe der Schließkammer (8) im Bereich der Ausnehmungen (17) das drei- bis fünfzehnfache der Höhe der Schließkammer (8) im Bereich neben den Ausnehmungen (17) beträgt. 12. Centrifuge according to one of the preceding claims, characterized in that the height of the closing chamber (8) in the region of the recesses (17) is three to fifteen times the height of the closing chamber (8) in the area adjacent to the recesses (17) ,
EP09783343.8A 2008-09-25 2009-09-23 Centrifuge having a selfdischarging bowl Active EP2326427B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200810048934 DE102008048934A1 (en) 2008-09-25 2008-09-25 Centrifuge with a self-cleaning centrifugal drum
PCT/EP2009/062339 WO2010034751A1 (en) 2008-09-25 2009-09-23 Centrifuge with a self-emptying centrifuge drum

Publications (2)

Publication Number Publication Date
EP2326427A1 true EP2326427A1 (en) 2011-06-01
EP2326427B1 EP2326427B1 (en) 2017-01-11

Family

ID=41422648

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09783343.8A Active EP2326427B1 (en) 2008-09-25 2009-09-23 Centrifuge having a selfdischarging bowl

Country Status (4)

Country Link
EP (1) EP2326427B1 (en)
CN (1) CN102164679B (en)
DE (1) DE102008048934A1 (en)
WO (1) WO2010034751A1 (en)

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Publication number Priority date Publication date Assignee Title
EP2774684B1 (en) * 2013-03-06 2018-10-17 Alfa Laval Corporate AB A centrifugal separator
EP2808086A1 (en) 2013-05-27 2014-12-03 Alfa Laval Corporate AB Centrifugal separator and method for determining suitable moment for removal of heavy phase content

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Publication number Priority date Publication date Assignee Title
DK117207B (en) * 1960-04-20 1970-03-23 Separator Ab Sludge centrifuge.
SE321896B (en) 1968-02-29 1970-03-16 Alfa Laval Ab
DE3012108C2 (en) * 1980-03-28 1982-09-23 Westfalia Separator Ag, 4740 Oelde Self-emptying centrifugal drum
DE3208808C2 (en) 1982-03-11 1984-11-22 Westfalia Separator Ag, 4740 Oelde Centrifuge with a self-cleaning centrifugal drum
DE3240093C2 (en) 1982-10-29 1986-03-27 Westfalia Separator Ag, 4740 Oelde Centrifuge with a self-cleaning centrifugal drum
DE3240998C2 (en) * 1982-11-06 1985-05-30 Westfalia Separator Ag, 4740 Oelde Centrifuge with a self-cleaning centrifugal drum
DE3607526A1 (en) 1985-03-14 1987-09-10 Westfalia Separator Ag Centrifuge with a self-emptying centrifuge drum
DE3509139C1 (en) 1985-03-14 1986-04-17 Westfalia Separator Ag, 4740 Oelde Centrifuge with a self-draining centrifuge
DE3524731C1 (en) 1985-07-11 1986-11-27 Westfalia Separator Ag, 4740 Oelde Centrifuge with a self-draining centrifuge
DE4436459C2 (en) * 1994-10-12 1997-04-24 Flottweg Gmbh Centrifugal drum
SE510541C2 (en) * 1997-09-29 1999-05-31 Alfa Laval Ab Centrifugal separator control device
SE529562C2 (en) * 2006-02-13 2007-09-18 Alfa Laval Corp Ab Ways of monitoring centrifugal separator

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Title
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Also Published As

Publication number Publication date
CN102164679B (en) 2016-03-30
WO2010034751A1 (en) 2010-04-01
DE102008048934A1 (en) 2010-04-01
CN102164679A (en) 2011-08-24
EP2326427B1 (en) 2017-01-11

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