EP2598251A2 - Fully jacketed screw centrifuge having an overflow weir - Google Patents

Fully jacketed screw centrifuge having an overflow weir

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Publication number
EP2598251A2
EP2598251A2 EP11735650.1A EP11735650A EP2598251A2 EP 2598251 A2 EP2598251 A2 EP 2598251A2 EP 11735650 A EP11735650 A EP 11735650A EP 2598251 A2 EP2598251 A2 EP 2598251A2
Authority
EP
European Patent Office
Prior art keywords
weir
solid bowl
centrifuge according
drum
overflow
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
EP11735650.1A
Other languages
German (de)
French (fr)
Other versions
EP2598251B1 (en
Inventor
Stefan Terholsen
Jürgen HERMELER
Ludger HORSTKÖTTER
Kathrin Quiter
Jürgen TEIGELER
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
Original Assignee
GEA Mechanical Equipment GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
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Application filed by GEA Mechanical Equipment GmbH filed Critical GEA Mechanical Equipment GmbH
Publication of EP2598251A2 publication Critical patent/EP2598251A2/en
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Publication of EP2598251B1 publication Critical patent/EP2598251B1/en
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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
    • B04B1/20—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl
    • 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
    • B04B1/20—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl
    • B04B2001/2075—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl with means for recovering the energy of the outflowing liquid
    • 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
    • B04B1/20—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl
    • B04B2001/2083—Configuration of liquid outlets

Definitions

  • the invention relates to a solid bowl screw centrifuge according to the preamble of claim 1.
  • Solid bowl centrifuges are known in various embodiments.
  • DE 102 03 652 B4 discloses a solid bowl screw centrifuge with a device for discharging clarified liquid from a drum having a drum cover with a passage to which a throttle device, in particular a throttle plate, is assigned, whose distance from the passage is variable.
  • the passage further nozzles are assigned to the outlet of the clarified liquid, which are aligned for energy saving inclined to the radial direction through the drum axis.
  • Nozzles on solid bowl centrifuges and their effect of energy saving with a corresponding orientation inclined to the drum axis are also known from DE 39 004 151 A1.
  • Guiding plates can be assigned, which give the fluid emerging from the drum a twist, the occurring recoil effect to
  • the baffles are attached to the outside of the overflow weir, for example to the weir plates. They are for example formed as flat sheets, which are parallel to
  • Plates lie, the drum axis does not intersect and about an angle of about 45 ° with the radially extending straight line, which runs through the drum rotation axis and the respective passage opening.
  • the invention has, starting from this prior art, the task of creating a further optimized in terms of energy saving Vollmantel- screw centrifuge. The invention solves this problem by the subject matter of claim 1.
  • the deflection device configured such that an escaping liquid flow while maintaining the overflow weir at the weir edge directly in the axial extension of
  • Embodiment for example, characterized in that the baffle at least partially directly in the axial extension of not covered by the respective weir plate portion of the passage opening is located axially outside the passage opening and this covers axially in whole or in part.
  • Passage opening to assign a housing, in which case the overflow weir or a nozzle in a sloping side of the housing at the passage opening
  • the present invention leaves the overflow weir directly to the weir plates on the drum cover and only the liquid, which has already left the rotating system on the overflow weir, is deflected in the circumferential direction. After emerging from the drum, no clearing effect can occur any more, but the entire outgoing liquid jet is deflected by the deflector in the circumferential direction. Further advantageous embodiments can be found in the remaining subclaims.
  • FIG. 1 shows a schematically illustrated drum lid of a solid bowl screw centrifuge according to the invention.
  • Fig. 2 is a schematic view of a known solid bowl screw centrifuge.
  • Fig. 2 is intended to illustrate the basic structure of a solid bowl screw centrifuge. The drive together with control, a hood and other obvious for the expert elements are not shown here.
  • Fig. 2 shows a solid bowl screw centrifuge 1 with a rotatable about a rotation axis D drum 3, in which a likewise rotatable screw 5 is arranged.
  • the drum 3 and the screw 5 each have a substantially cylindrical portion and a conically tapered portion here.
  • An axially extending centric inlet pipe 7 serves to supply the centrifuged material via a distributor 9 in the centrifugal space 1 1 between the screw 5 and the drum.
  • the screw 5 rotates at a slightly lower or greater speed than the drum 3 and promotes the ejected solid to the conical portion out of the drum 3 to the solids discharge 13.
  • the liquid flows to the larger drum diameter at the rear end of the cylindrical portion of the drum 3 and is derived there through over a weir, the passage openings 15 in a drum cover 17 has, each
  • Passage opening 15 is associated with a weir plate 19, which here radially adjustably mounted on the Au .seite the drum cover.
  • the inner radial edge of the weir plate thus defines an overflow edge and thus also the actual weir or overflow weir 21.
  • Drum cover by the drum cover and the weir plate of Fig. 1 are replaced.
  • the drum cover 1 7 also has passage openings 1 5, each of which a weir plate 1 9 is assigned.
  • the weir plates 19 are preferably directly au Shen on the drum cover 1 7 aligned in parallel to this.
  • the weir plates 1 9 in turn form at their relative to the axis of rotation D inner radius Rk each have an overflow edge and thus an overflow weir 21.
  • Au Shen is preferably attached to each of the weir plates 1 9 a deflector 23 attached.
  • the deflecting device 23 preferably has in each case a supporting wall 25 extending parallel to the weir plate-an axial wall section-and a deflecting wall 27 oriented at right angles thereto.
  • the axial wall section may be flat or rounded.
  • the connecting line between the support wall 25 and the weir plate 1 9 carries the reference numeral 31.
  • the support wall 25 is preferably aligned with the overflow edge at the radius Rk of the weir plate 1 9. This achieves advantageous that the actual weir 21 is not changed in terms of its location, it is still from the
  • Overflow weirs 21 are maintained on a weir plate 19.
  • the support wall 25 is offset slightly radially outward Shen relative to the support wall, so that the connecting line 31 radially outer Shen further Shen, for example, 0, 5 mm to 3 mm further au Shen runs.
  • the baffle 27 causes the actual deflection of the exiting product flow or the imposition of a twist in the circumferential direction, but does not change the position of the weir or the overflow edge. The baffle 27 merely causes the liquid, which has flowed over the overflow weir, is deflected from the axial direction. Such is a distraction of the
  • Liquid jet reaches substantially in the circumferential direction, resulting in an overall energy savings compared to a liquid leakage in the axial direction.
  • the baffle a it is advantageous if the baffle a
  • arcuate wall portion 27a and has a subsequent planar wall portion 27b.
  • the arcuate portion 27a causes a deflection of the liquid phase flowing in the axial direction X from the drum 3 in the circumferential direction or the imposition of a twist in the circumferential direction (against the direction of rotation).
  • the flat wall portion 27b forwards the product flow one piece in this direction.
  • the arcuate portion 27a is dimensioned such that substantially the deflection of the product flow from the axial direction X takes place here against the direction of rotation U, so that a recoil effect results, which results in an energy saving or energy recovery.
  • Wall portion relative to the axial direction corresponds - is preferably less than 90 °, preferably, the deflection angle ⁇ is about 70 to 85 °.
  • the deflection angle ⁇ is preferably smaller than 90 °, it is ensured in a simple manner that not too much of the drum 1 flowing out or exiting liquid is deflected so far from the axial direction that the liquid splashes against the outside of the drum cover 17 again which would mean a certain loss of energy.
  • the baffle 27 at least partially lies directly in the axial extension outside the passage opening and this covers completely or partially axially on the radius of the passage opening. In this way, compared to the generic JP 1 1 - 179236, the advantage is achieved that a larger proportion of the outflowing liquid is already on the
  • the invention ensures that the radial position of the actual weir is not changed but is still defined by the edge of the weir plates. It is particularly advantageous if the weir plate 1 7 and the deflector 23 are materially interconnected and thus form a structural unit.
  • the weir plates 17 and attached thereto are preferably identical to the weir plates 17 and attached thereto.
  • Deflector 23 together radially adjustable, e.g. by means of screws (not shown), with which the weir plates 19 are screwed to the drum cover 17 respectively.
  • a plurality of screw holes 29 are preferably distributed radially offset from each other on the weir plates, so that by a suitable choice of screw holes 29 in a simple manner, the radial position of the weir plates 19 on the drum cover 17 is adjustable.
  • the construction according to the invention can be cleaned well. By maintaining the position of the overflow weir 21 is avoided that forms a space in which easily soiling can settle.

Landscapes

  • Centrifugal Separators (AREA)

Abstract

The invention relates to a fully jacketed screw centrifuge having at least one outlet for discharging clarified liquid from a drum (3), wherein said outlet comprises at least one or more passages (15) in a drum cover (17), each associated with a weir plate (19), each forming an overflow weir (21) at the radial inner edge thereof, wherein at least one deflecting device (23) is designed at the outside on the drum cover (17), such that an escaping fluid flow is deflected in the circumferential direction and undergoes a twist in the circumferential direction, wherein the at least one deflecting device (23) is designed such that the escaping fluid flow is deflected in the circumferential direction, maintaining the overflow weir (21) at the overflow edge of the at least one weir plate (19), directly in the axial extension of the uncovered region of the penetration opening (15).

Description

Vollmantel-Schneckenzentrifuge mit Überlaufwehr  Solid bowl centrifuge with overflow weir
Die Erfindung betrifft eine Vollmantel-Schneckenzentrifuge nach dem Oberbegriff des Anspruchs 1 . The invention relates to a solid bowl screw centrifuge according to the preamble of claim 1.
Vollmantel-Schneckenzentrifugen sind in verschiedensten Ausführungsformen bekannt. So offenbart die DE 102 03 652 B4 eine Vollmantel-Schneckenzentrifuge mit einer Einrichtung zum Ableiten geklärter Flüssigkeit aus einer Trommel, die einen Trommeldeckel mit einem Durchlass aufweist, dem eine Drosseleinrichtung, insbesondere eine Drosselscheibe, zugeordnet ist, deren Abstand zum Durchlass veränderlich ist. Dabei sind dem Durchlass ferner Düsen zum Auslass der geklärten Flüssigkeit zugeordnet, welche zur Energieeinsparung geneigt zur Radialrichtung durch die Trommelachse ausgerichtet sind. Solid bowl centrifuges are known in various embodiments. Thus, DE 102 03 652 B4 discloses a solid bowl screw centrifuge with a device for discharging clarified liquid from a drum having a drum cover with a passage to which a throttle device, in particular a throttle plate, is assigned, whose distance from the passage is variable. In this case, the passage further nozzles are assigned to the outlet of the clarified liquid, which are aligned for energy saving inclined to the radial direction through the drum axis.
Düsen an Vollmantelschneckenzentrifugen und ihr Effekt der Energieeinsparung bei entsprechender Ausrichtung geneigt zur Trommelachse sind ferner aus der DE 39 004 151 A1 bekannt. Nozzles on solid bowl centrifuges and their effect of energy saving with a corresponding orientation inclined to the drum axis are also known from DE 39 004 151 A1.
Die Veröffentlichung„Patent Abstracts of Japan", Nummer 1 1 179236 A, offenbart demgegenüber, dass Durchlassöffnungen im Trommeldeckel, die jeweils teilweise von einer Wehrplatte verschlossen sind, welche ein Überlaufwehr bilden, The publication "Patent Abstracts of Japan", number 1 1 179236 A, in contrast, discloses that passage openings in the drum cover, which are each partially closed by a weir plate, which form an overflow weir,
Leitbleche zugeordnet werden können, welche der aus der Trommel austretenden Flüssigkeit einen Drall geben, wobei der auftretende Rückstoßeffekt zur Guiding plates can be assigned, which give the fluid emerging from the drum a twist, the occurring recoil effect to
Energieeinsparung genutzt werden soll. Die Leitbleche sind an der Außenseite des Überlaufwehrs beispielsweise an den Wehrplatten angebracht. Sie sind beispielsweise als ebene Bleche ausgebildet, welche parallel zur Energy saving should be used. The baffles are attached to the outside of the overflow weir, for example to the weir plates. They are for example formed as flat sheets, which are parallel to
Trommeldrehachse ausgerichtet sind, wobei die Ebene, in welcher die ebenenDrum rotation axis are aligned, the plane in which the plane
Bleche liegen, die Trommelachse nicht schneidet und etwa einen Winkel von etwa 45° mit der radial verlaufenden Gerade einschließt, welche jeweils durch die Trommeldrehachse und die jeweilige Durchlassöffnung verläuft. Die Erfindung hat ausgehend von diesem Stand der Technik die Aufgabe, eine hinsichtlich der Energieeinsparung weiter optimierte Vollmantel- Schneckenzentrifuge zu schaffen. Die Erfindung löst diese Aufgabe durch den Gegenstand des Anspruchs 1 . Plates lie, the drum axis does not intersect and about an angle of about 45 ° with the radially extending straight line, which runs through the drum rotation axis and the respective passage opening. The invention has, starting from this prior art, the task of creating a further optimized in terms of energy saving Vollmantel- screw centrifuge. The invention solves this problem by the subject matter of claim 1.
Danach ist - vorzugsweise an der Wehrplatte - die Ablenkeinrichtung derart ausgestaltet, dass ein austretender Flüssigkeitsstrom unter Beibehaltung des Überlaufwehrs an der Wehrkante direkt in axialer Verlängerung der Thereafter - preferably at the weir plate - the deflection device configured such that an escaping liquid flow while maintaining the overflow weir at the weir edge directly in the axial extension of
Durchtrittsöffnung einen Drall in Umfangsrichtung erfährt. Passage opening experiences a twist in the circumferential direction.
Erreicht werden kann dies nach einer ganz besonders bevorzugten This can be achieved according to a very preferred
Ausführungsform beispielsweise dadurch, dass die Ablenkwand jedenfalls teilweise direkt in axialer Verlängerung des von der jeweiligen Wehrplatte nicht abgedeckten Bereichs der Durchlassöffnung axial außen vor der Durchlassöffnung liegt und diese axial ganz oder teilweise abdeckt. Embodiment, for example, characterized in that the baffle at least partially directly in the axial extension of not covered by the respective weir plate portion of the passage opening is located axially outside the passage opening and this covers axially in whole or in part.
Es ist auch zwar bekannt - so aus der US 2004/0072668 A1 oder der WO Although it is also known - as from US 2004/0072668 A1 or WO
2008/138345 A1 - anstelle eines Überlaufwehr an der Wehrplatte der 2008/138345 A1 - instead of an overflow weir at the weir plate
Durchlassöffnung ein Gehäuse zuzuordnen, wobei dann das Überlaufwehr oder eine Düse in einer Schrägseite des Gehäuses an der Durchlassöffnung Passage opening to assign a housing, in which case the overflow weir or a nozzle in a sloping side of the housing at the passage opening
ausgebildet werden. Diese Konstruktionen bringen jedoch den Nachteil mit sich, dass an der Außenseite des Trommeldeckels mit rotierende Flüssigkeitskammern gebildet werden, die einen Teil des rotierenden Systems bilden, so dass sich in den Flüssigkeitskammern noch der Klär- oder Trennvorgang fortsetzt. Aus diesem Trennvorgang können unerwünschte Ablagerungen in den Kammern resultieren, welche Reinigungsprobleme mit sich bringen. be formed. However, these constructions have the disadvantage that are formed on the outside of the drum cover with rotating fluid chambers that form part of the rotating system, so that in the fluid chambers, the clarification or separation process continues. From this separation process undesirable deposits in the chambers can result, which bring cleaning problems with it.
Es ist daher vorteilhaft, dass die vorliegende Erfindung das Überlaufwehr an sich direkt an den Wehrplatten am Trommeldeckel belässt und erst die Flüssigkeit, welche das rotierende System bereits über das Überlaufwehr verlassen hat, in Umfangsrichtung umgelenkt wird. Nach dem Austritt aus der Trommel kann kein Kläreffekt mehr auftreten, der gesamte austretende Flüssigkeitsstrahl wird vielmehr durch die Ablenkeinrichtung in Umfangsrichtung abgelenkt. Weitere vorteilhafte Ausgestaltungen sind den übrigen Unteransprüchen zu entnehmen. It is therefore advantageous that the present invention leaves the overflow weir directly to the weir plates on the drum cover and only the liquid, which has already left the rotating system on the overflow weir, is deflected in the circumferential direction. After emerging from the drum, no clearing effect can occur any more, but the entire outgoing liquid jet is deflected by the deflector in the circumferential direction. Further advantageous embodiments can be found in the remaining subclaims.
Nachfolgend wird die Erfindung unter Bezug auf die Zeichnung näher The invention will be described in more detail below with reference to the drawing
beschrieben. Es zeigt: described. It shows:
Fig. 1 einen schematisch dargestellten Trommeldeckel einer erfindungsgemäßen Vollmantel-Schneckenzentrifuge; und  1 shows a schematically illustrated drum lid of a solid bowl screw centrifuge according to the invention; and
Fig. 2 eine schematische Ansicht einer bekannten Vollmantel- Schneckenzentrifuge.  Fig. 2 is a schematic view of a known solid bowl screw centrifuge.
Fig. 2 soll den grundsätzlichen Aufbau einer Vollmantel-Schneckenzentrifuge verdeutlichen. Der Antrieb nebst Steuerung, eine Haube und weitere für den Fachmann selbstverständliche Elemente sind hier nicht dargestellt. Fig. 2 zeigt eine Vollmantel-Schneckenzentrifuge 1 mit einer um eine Drehachse D drehbaren Trommel 3, in der eine ebenfalls drehbare Schnecke 5 angeordnet ist. Die Trommel 3 und die Schnecke 5 weisen jeweils einen im Wesentlichen zylindrischen Abschnitt und einen sich hier konisch verjüngenden Abschnitt auf. Ein sich axial erstreckendes zentrisches Einlaufrohr 7 dient zur Zuleitung des Schleudergutes über einen Verteiler 9 in den Schleuderraum 1 1 zwischen der Schnecke 5 und der Trommel 3. Fig. 2 is intended to illustrate the basic structure of a solid bowl screw centrifuge. The drive together with control, a hood and other obvious for the expert elements are not shown here. Fig. 2 shows a solid bowl screw centrifuge 1 with a rotatable about a rotation axis D drum 3, in which a likewise rotatable screw 5 is arranged. The drum 3 and the screw 5 each have a substantially cylindrical portion and a conically tapered portion here. An axially extending centric inlet pipe 7 serves to supply the centrifuged material via a distributor 9 in the centrifugal space 1 1 between the screw 5 and the drum. 3
Wird beispielsweise ein schlammiger Brei in die Zentrifuge geleitet, setzen sich an der Trommelwandung gröbere Feststoffpartikel ab. Weiter nach innen hin bildet sich eine Flüssigkeitsphase aus. For example, if a muddy slurry is fed into the centrifuge, coarser solid particles settle on the drum wall. Further inward, a liquid phase forms.
Die Schnecke 5 rotiert mit einer etwas kleineren oder größeren Geschwindigkeit als die Trommel 3 und fördert den ausgeschleuderten Feststoff zum konischen Abschnitt hin aus der Trommel 3 zum Feststoffaustrag 13. Die Flüssigkeit strömt dagegen zum größeren Trommeldurchmesser am hinteren Ende des zylindrischen Abschnittes der Trommel 3 und wird dort durch über ein Wehr abgeleitet, das Durchlassöffnungen 15 in einem Trommeldeckel 17 aufweist, wobei jeder The screw 5 rotates at a slightly lower or greater speed than the drum 3 and promotes the ejected solid to the conical portion out of the drum 3 to the solids discharge 13. The liquid, however, flows to the larger drum diameter at the rear end of the cylindrical portion of the drum 3 and is derived there through over a weir, the passage openings 15 in a drum cover 17 has, each
Durchlassöffnung 15 eine Wehrplatte 19 zugeordnet ist, welche hier radial verstellbar an der Au ßenseite des Trommeldeckels angebracht ist. Die innere radiale Kante der Wehrplatte definiert damit eine Überlaufkante und damit auch das eigentliche Wehr bzw. Überlaufwehr 21 . Erfindungsgemäß kann z.B. bei einer Vollmantel-Schneckenzentrifuge nach Art der Fig. 2 der Trommeldeckel bzw. die wenigstens eine Wehrplatte am Passage opening 15 is associated with a weir plate 19, which here radially adjustably mounted on the Au ßenseite the drum cover. The inner radial edge of the weir plate thus defines an overflow edge and thus also the actual weir or overflow weir 21. According to the invention, for example, in a solid bowl screw centrifuge according to the type of FIG. 2, the drum cover or the at least one weir plate on
Trommeldeckel durch den Trommeldeckel bzw. die Wehrplatte der Fig. 1 ersetzt werden. Nach Fig. 1 weist der Trommeldeckel 1 7 ebenfalls Durchlassöffnungen 1 5 auf, denen jeweils eine Wehrplatte 1 9 zugeordnet ist. Die Wehrplatten 19 liegen vorzugsweise direkt au ßen am Trommeldeckel 1 7 parallel ausgerichtet an diesem an. Die Wehrplatten 1 9 bilden wiederum an ihrem relativ zur Drehachse D inneren Radius Rk jeweils eine Überlaufkante und damit ein Überlaufwehr 21 aus. Drum cover by the drum cover and the weir plate of Fig. 1 are replaced. According to Fig. 1, the drum cover 1 7 also has passage openings 1 5, each of which a weir plate 1 9 is assigned. The weir plates 19 are preferably directly au Shen on the drum cover 1 7 aligned in parallel to this. The weir plates 1 9 in turn form at their relative to the axis of rotation D inner radius Rk each have an overflow edge and thus an overflow weir 21.
Au ßen ist an vorzugsweise jeder der Wehrplatten 1 9 eine Ablenkeinrichtung 23 angebracht. Die Ablenkeinrichtung 23 weist jeweils vorzugsweise eine sich parallel zur Wehrplatte erstreckende Stützwand 25 auf - einen Axialwandabschnitt - und eine hierzu rechtwinklig ausgerichtete Ablenkwand 27. Der Axialwandabschnitt kann eben oder aber auch gerundet ausgebildet sein. Die Verbindungslinie zwischen der Stützwand 25 und der Wehrplatte 1 9 trägt das Bezugszeichen 31 . Die Stützwand 25 fluchtet vorzugsweise mit der Überlaufkante am Radius Rk der Wehrplatte 1 9. Hierdurch wird vorteilhaft erreicht, dass das eigentliche Wehr 21 hinsichtlich seiner Lage nicht verändert wird, es wird nach wie vor von der Au Shen is preferably attached to each of the weir plates 1 9 a deflector 23 attached. The deflecting device 23 preferably has in each case a supporting wall 25 extending parallel to the weir plate-an axial wall section-and a deflecting wall 27 oriented at right angles thereto. The axial wall section may be flat or rounded. The connecting line between the support wall 25 and the weir plate 1 9 carries the reference numeral 31. The support wall 25 is preferably aligned with the overflow edge at the radius Rk of the weir plate 1 9. This achieves advantageous that the actual weir 21 is not changed in terms of its location, it is still from the
Innenkante bzw. Überlaufkante Rk der Wehrplatten 1 5 gebildet. Dies bringt den Vorteil mit sich, dass die vorteilhaften Eigenschaften eines derartigen Inner edge or overflow edge Rk of the weir plates 1 5 formed. This has the advantage that the advantageous properties of such
Überlaufwehrs 21 an einer Wehrplatte 19 beibehalten werden. Overflow weirs 21 are maintained on a weir plate 19.
Es ist auch denkbar, dass die Stützwand 25 etwas radial nach au ßen relativ zur Stützwand versetzt ist, so dass die Verbindungslinie 31 radial etwas weiter au ßen, z.B. 0, 5 mm bis 3 mm weiter au ßen verläuft. Die Ablenkwand 27 bewirkt dagegen die eigentliche Ablenkung des austretenden Produktstroms bzw. das Aufprägen eines Dralls in Umfangsrichtung, verändert aber die Lage des Wehres bzw. der Überlaufkante nicht. Die Ablenkwand 27 bewirkt lediglich, dass die Flüssigkeit, welche das Überlaufwehr überströmt hat, aus der Axialrichtung umgelenkt wird. Derart wird ein Ablenken des It is also conceivable that the support wall 25 is offset slightly radially outward Shen relative to the support wall, so that the connecting line 31 radially outer Shen further Shen, for example, 0, 5 mm to 3 mm further au Shen runs. In contrast, the baffle 27 causes the actual deflection of the exiting product flow or the imposition of a twist in the circumferential direction, but does not change the position of the weir or the overflow edge. The baffle 27 merely causes the liquid, which has flowed over the overflow weir, is deflected from the axial direction. Such is a distraction of the
Flüssigkeitsstrahls im Wesentlichen in Umfangsrichtung erreicht, was insgesamt in einer Energieeinsparung gegenüber einem Flüssigkeitsaustritt in Axialrichtung resultiert. Um dies zu erreichen, ist es vorteilhaft, wenn die Ablenkwand einen  Liquid jet reaches substantially in the circumferential direction, resulting in an overall energy savings compared to a liquid leakage in the axial direction. To achieve this, it is advantageous if the baffle a
bogenförmigen Wandabschnitt 27a aufweist und einen sich daran anschließenden ebenen Wandabschnitt 27b. arcuate wall portion 27a and has a subsequent planar wall portion 27b.
Der bogenförmige Abschnitt 27a bewirkt eine Umlenkung der in Axialrichtung X aus der Trommel 3 fließenden Flüssigkeitsphase in Umfangsrichtung bzw. das Aufprägen eines Dralls in Umfangsrichtung (gegen die Drehrichtung). Der ebene Wandabschnitt 27b leitet den Produktstrom ein Stück in dieser Richtung weiter. Vorzugsweise ist der bogenförmige Abschnitt 27a derart bemessen, dass im Wesentlichen hier die Umlenkung des Produktstroms aus der Axialrichtung X gegen die Drehrichtung U erfolgt, so dass ein Rückstoßeffekt entsteht, welcher in einer Energieeinsparung bzw. Energierückgewinnung resultiert. The arcuate portion 27a causes a deflection of the liquid phase flowing in the axial direction X from the drum 3 in the circumferential direction or the imposition of a twist in the circumferential direction (against the direction of rotation). The flat wall portion 27b forwards the product flow one piece in this direction. Preferably, the arcuate portion 27a is dimensioned such that substantially the deflection of the product flow from the axial direction X takes place here against the direction of rotation U, so that a recoil effect results, which results in an energy saving or energy recovery.
Der gewählte Umlenkwinkel α - welcher der Ausrichtung des ebenen The selected deflection angle α - which the orientation of the plane
Wandabschnittes relativ zur Axialrichtung entspricht - ist bevorzugt kleiner als 90°, vorzugsweise beträgt der Umlenkwinkel α ca. 70 bis 85°. Indem der Umlenkwinkel α vorzugsweise kleiner ist als 90°, wird auf einfache Weise sichergestellt, dass nicht zu viel an aus der Trommel 1 abströmender bzw. austretender Flüssigkeit derart weit aus der Axialrichtung umgelenkt wird, dass die Flüssigkeit wieder gegen die Außenseite des Trommeldeckels 17 spritzt, was wiederum einen gewissen Energieverlust bedeuten würde. Wall portion relative to the axial direction corresponds - is preferably less than 90 °, preferably, the deflection angle α is about 70 to 85 °. By the deflection angle α is preferably smaller than 90 °, it is ensured in a simple manner that not too much of the drum 1 flowing out or exiting liquid is deflected so far from the axial direction that the liquid splashes against the outside of the drum cover 17 again which would mean a certain loss of energy.
Besonders vorteilhaft ist, dass die Ablenkwand 27 jedenfalls teilweise direkt in axialer Verlängerung außen vor der Durchlassöffnung liegt und diese axial auf dem Radius der Durchlassöffnung ganz oder teilweise abdeckt. Derart wird gegenüber der gattungsgemäßen JP 1 1 - 179236 der Vorteil erreicht, dass ein größerer Anteil der ausströmenden Flüssigkeit bereits auf dem It is particularly advantageous that the baffle 27 at least partially lies directly in the axial extension outside the passage opening and this covers completely or partially axially on the radius of the passage opening. In this way, compared to the generic JP 1 1 - 179236, the advantage is achieved that a larger proportion of the outflowing liquid is already on the
geringeren Radius der Durchlassöffnung in Umfangsrichtung umgelenkt wird, so dass eine größere Energieeinsparung erreicht wird als in dieser Schrift, nach welcher die Umlenkung stets auf einem größeren Radius erfolgt. Andererseits wird durch die Erfindung sichergestellt, dass sich die radiale Lage des eigentlichen Wehrs nicht verändert sondern nach wie vor durch die Kante der Wehrplatten definiert wird. Es ist besonders vorteilhaft, wenn die Wehrplatte 1 7 und die Ablenkeinrichtung 23 stoffschlüssig miteinander verbunden sind und derart eine bauliche Einheit bilden. smaller radius of the passage opening is deflected in the circumferential direction, so that a greater energy saving is achieved than in this document, after which the deflection always takes place over a larger radius. On the other hand, it is ensured by the invention that the radial position of the actual weir is not changed but is still defined by the edge of the weir plates. It is particularly advantageous if the weir plate 1 7 and the deflector 23 are materially interconnected and thus form a structural unit.
Vorzugsweise sind die Wehrplatten 17 und die daran angebrachte Preferably, the weir plates 17 and attached thereto
Ablenkeinrichtung 23 gemeinsam radial verstellbar, z.B. mit Hilfe von Schrauben (nicht dargestellt), mit denen die Wehrplatten 19 jeweils an den Trommeldeckel 17 geschraubt werden. Dabei sind an den Wehrplatten jeweils vorzugsweise mehrere Schraubbohrungen 29 radial zueinander versetzt verteilt, so dass durch eine geeignete Wahl der Schraubbohrungen 29 auf einfache Weise die radiale Position der Wehrplatten 19 am Trommeldeckel 17 einstellbar ist. Deflector 23 together radially adjustable, e.g. by means of screws (not shown), with which the weir plates 19 are screwed to the drum cover 17 respectively. In this case, a plurality of screw holes 29 are preferably distributed radially offset from each other on the weir plates, so that by a suitable choice of screw holes 29 in a simple manner, the radial position of the weir plates 19 on the drum cover 17 is adjustable.
Besonders vorteilhaft ist, dass sich die erfindungsgemäße Konstruktion gut reinigen lässt. Durch das Beibehalten der Lage des Überlaufwehrs 21 wird vermieden, dass sich ein Raum bildet, in welchem sich leicht Verschmutzungen absetzen können. It is particularly advantageous that the construction according to the invention can be cleaned well. By maintaining the position of the overflow weir 21 is avoided that forms a space in which easily soiling can settle.
Bezugszeichen reference numeral
Vollmantel-Schneckenzentrifuge 1Solid bowl centrifuge 1
Trommel 3Drum 3
Schnecke 5Snail 5
Einlaufrohr 7Inlet pipe 7
Verteiler 9 Schleuderraum 1Distributor 9 Centrifugal space 1
Feststoffaustrag 13Solids discharge 13
Durchlassöffnungen 15Passage openings 15
Trommeldeckel 17Drum cover 17
Wehrplatte 19 Überlaufwehr 21Weir plate 19 overflow weir 21
Ablenkeinrichtung 23Deflection device 23
Stützwand 25Supporting wall 25
Ablenkwand 27Baffle 27
Bohrungen drilling
Drehachse axis of rotation
Radius radius

Claims

Patentansprüche claims
1 . Vollmantel-Schneckenzentrifuge mit wenigstens einem Ablauf zum Ableiten geklärter Flüssigkeit aus einer Trommel (3), der wenigstens einen oder mehrere Durchlässe (15) in einem Trommeldeckel (17) aufweist, dem oder denen jeweils eine Wehrplatte (19) zugeordnet ist, die an ihrer radialen Innenkante jeweils ein Überlaufwehr (21 ) bilden, wobei außen an dem Trommeldeckel (17) ferner wenigstens eine Ablenkeinrichtung (23) ausgebildet ist, welche derart ausgebildet ist, dass ein austretender 1 . A solid bowl screw centrifuge with at least one drain for discharging clarified liquid from a drum (3) having at least one or more passages (15) in a drum cover (17) to each of which a weir plate (19) is associated Radial inner edge in each case form an overflow weir (21), wherein on the outside of the drum cover (17) further at least one deflection device (23) is formed, which is designed such that an exiting
Flüssigkeitsstrom in Umfangsrichtung abgelenkt wird bzw. einen Drall in Umfangsrichtung erfährt, dadurch gekennzeichnet, dass die wenigstens eine Ablenkeinrichtung (23) derart ausgebildet ist, dass der austretende Flüssigkeitsstrom unter Beibehaltung des Überlaufwehrs (21 ) an der Überlaufkante der wenigstens einen Wehrplatte (19) direkt in axialer Verlängerung des von der jeweiligen Wehrplatte nicht abgedeckten  Liquid flow is deflected in the circumferential direction or undergoes a swirl in the circumferential direction, characterized in that the at least one deflector (23) is formed such that the exiting liquid flow while maintaining the overflow weir (21) at the overflow edge of the at least one weir plate (19) directly in axial extension of not covered by the respective weir plate
Bereichs der Durchtrittsöffnung (15) in Umfangsrichtung abgelenkt wird.  Area of the passage opening (15) is deflected in the circumferential direction.
2. Vollmantel-Schneckenzentrifuge nach Anspruch 1 , dadurch 2. solid bowl screw centrifuge according to claim 1, characterized
gekennzeichnet, dass die Ablenkeinrichtung (23) jedenfalls teilweise direkt in axialer Verlängerung außen vor der Durchlassöffnung auf deren Radius liegt und diese direkt in axialer Verlängerung des von der jeweiligen  characterized in that the deflection device (23) at least partially directly in the axial extension outside the passage opening on the radius and this directly in the axial extension of the respective
Wehrplatte nicht abgedeckten Bereichs axial ganz oder teilweise verdeckt.  Weir plate uncovered area axially completely or partially hidden.
3. Vollmantel-Schneckenzentrifuge nach Anspruch 1 , dadurch 3. solid bowl screw centrifuge according to claim 1, characterized
gekennzeichnet, dass an mehreren, vorzugsweise an jeder, der  characterized in that at several, preferably at each, the
Wehrplatten (19) jeweils eine der Ablenkeinrichtungen (23) angebracht ist.  Weir plates (19) each one of the deflection devices (23) is mounted.
4. Vollmantel-Schneckenzentrifuge nach Anspruch 1 oder 2, dadurch 4. solid bowl centrifuge according to claim 1 or 2, characterized
gekennzeichnet, dass die wenigstens eine Ablenkeinrichtung (23) jeweils eine Stützwand (25) aufweist und eine hierzu winklig ausgerichtete  characterized in that the at least one deflecting device (23) has in each case a supporting wall (25) and an angled thereto for this purpose
Ablenkwand (27).  Baffle (27).
5. Vollmantel-Schneckenzentrifuge nach Anspruch 3, dadurch 5. solid bowl centrifuge according to claim 3, characterized
gekennzeichnet, dass die Stützwand (25) als Axialwandabschnitt ausgebildet ist und dass die Ablenkwand (27) rechtwinklig zur Stützwand (25) ausgebildet ist. characterized in that the support wall (25) as Axialwandabschnitt is formed and that the baffle (27) is formed at right angles to the support wall (25).
6. Vollmantel-Schneckenzentrifuge nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Stützwand (25) mit der das 6. solid bowl centrifuge according to one of the preceding claims, characterized in that the support wall (25) with the
Überlaufwehr (21 ) bildenden Überlaufkante am Radius Rk der Wehrplatte (1 9) fluchtet.  Overflow weir (21) forming overflow edge at the radius Rk of the weir plate (1 9) is aligned.
7. Vollmantel-Schneckenzentrifuge nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass die Ablenkwand (27) einen bogenförmigen Wandabschnitt (27a) aufweist. 7. Solid bowl centrifuge according to one of the preceding claims, characterized in that the baffle (27) has an arcuate wall portion (27 a).
8. Vollmantel-Schneckenzentrifuge nach Anspruch 7, dadurch 8. solid bowl screw centrifuge according to claim 7, characterized
gekennzeichnet, dass die Ablenkwand (27) ferner einen sich an den bogenförmigen Wandabschnitt (27a) anschließenden ebenen  characterized in that the baffle (27) further comprises a plane adjacent to the arcuate wall portion (27a)
Wandabschnitt (27b) aufweist.  Wall section (27b) has.
9. Vollmantel-Schneckenzentrifuge nach Anspruch 8, dadurch 9. solid bowl screw centrifuge according to claim 8, characterized
gekennzeichnet, dass der bogenförmige Abschnitt (27a) derart gestaltet ist, dass er eine Umlenkung der in Axialrichtung X aus der Trommel 3 fließenden Flüssigkeitsphase im Wesentlichen in Umfangsrichtung bewirkt.  in that the arcuate portion (27a) is designed such that it causes a deflection of the liquid phase flowing out of the drum 3 in the axial direction X substantially in the circumferential direction.
1 0. Vollmantel-Schneckenzentrifuge nach einem der Ansprüche 7 oder 8, 1 0. A solid bowl screw centrifuge according to one of claims 7 or 8,
dadurch gekennzeichnet, dass der bogenförmige Abschnitt (27a) derart bemessen ist, dass eine Umlenkung des Produktstroms aus der  characterized in that the arcuate portion (27a) is dimensioned such that a deflection of the product stream from the
Axialrichtung X gegen die Drehrichtung U um einen Umlenkwinkel α erfolgt, der kleiner 90 ° oder gleich 90 ° ist, und vorzugsweise ca. 70 bis 85 ° beträgt.  Axial direction X against the direction of rotation U by a deflection angle α, which is less than 90 ° or equal to 90 °, and preferably about 70 to 85 °.
EP11735650.1A 2010-07-28 2011-07-25 Solid bowl screw centrifuge having an overflow weir Active EP2598251B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010032503A DE102010032503A1 (en) 2010-07-28 2010-07-28 Solid bowl centrifuge with overflow weir
PCT/EP2011/062722 WO2012013624A2 (en) 2010-07-28 2011-07-25 Fully jacketed screw centrifuge having an overflow weir

Publications (2)

Publication Number Publication Date
EP2598251A2 true EP2598251A2 (en) 2013-06-05
EP2598251B1 EP2598251B1 (en) 2016-11-02

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Country Status (8)

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US (1) US9333514B2 (en)
EP (1) EP2598251B1 (en)
CN (1) CN102958615B (en)
BR (1) BR112013003655B1 (en)
DE (1) DE102010032503A1 (en)
DK (1) DK2598251T3 (en)
SG (1) SG185472A1 (en)
WO (1) WO2012013624A2 (en)

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Also Published As

Publication number Publication date
SG185472A1 (en) 2012-12-28
CN102958615B (en) 2014-12-10
EP2598251B1 (en) 2016-11-02
BR112013003655A2 (en) 2016-09-06
WO2012013624A3 (en) 2012-03-29
DK2598251T3 (en) 2017-02-13
WO2012013624A2 (en) 2012-02-02
US20140051565A1 (en) 2014-02-20
BR112013003655B1 (en) 2020-12-08
US9333514B2 (en) 2016-05-10
DE102010032503A1 (en) 2012-02-02
CN102958615A (en) 2013-03-06

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