EP2872256B1 - Solid-bowl screw centrifuge with overflow weir - Google Patents

Solid-bowl screw centrifuge with overflow weir Download PDF

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Publication number
EP2872256B1
EP2872256B1 EP13736864.3A EP13736864A EP2872256B1 EP 2872256 B1 EP2872256 B1 EP 2872256B1 EP 13736864 A EP13736864 A EP 13736864A EP 2872256 B1 EP2872256 B1 EP 2872256B1
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EP
European Patent Office
Prior art keywords
solid
screw centrifuge
bowl screw
guide plate
recess
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EP13736864.3A
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German (de)
French (fr)
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EP2872256A1 (en
Inventor
Ludger HORSTKÖTTER
Jürgen HERMELER
Stefan Terholsen
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GEA Mechanical Equipment GmbH
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GEA Mechanical Equipment GmbH
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Priority to PL13736864T priority Critical patent/PL2872256T3/en
Publication of EP2872256A1 publication Critical patent/EP2872256A1/en
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    • 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
    • B04B11/00—Feeding, charging, or discharging bowls
    • B04B11/02—Continuous feeding or discharging; Control arrangements therefor
    • 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 screw centrifuges are known in various embodiments.
  • Nozzles on solid bowl centrifuges and their effect of saving energy with an appropriate orientation inclined to the drum axis are also from the DE 39 04 151 A1 known.
  • They are designed, for example, as flat sheets, which are aligned parallel to the axis of rotation of the drum, the plane in which the flat sheets lie, does not intersect the axis of the drum and encloses an angle of approximately 45 ° with the radial straight line, which in each case through the axis of rotation of the drum and the respective passage opening runs.
  • the weir plate has a material recess which forms at least part of a discharge channel or a complete discharge channel, the discharge channel being designed in such a way that it deflects flow emerging from the drum in a suitable manner.
  • the object of the invention is to solve the problem described above.
  • the bottom of the discharge channel is inclined toward the overflow edge relative to the tangential direction by an angle of inclination ⁇ > 0 ° at the location of the overflow edge inwards towards the axis of rotation.
  • a main advantage of this configuration is again that, as in the case of the type of WO 2008/138345 A1 can easily form product deposits. This disadvantage is avoided again by the open design of the drainage channels. The design is simple and stable. In addition, the emerging product stream is deflected to a radial diameter in such a way that a particularly large amount of energy is saved.
  • angle of inclination ⁇ ⁇ > 0 ° and ⁇ ⁇ 25 °, in particular ⁇ 10 10 ° and ⁇ 20 20 °, since a particularly advantageous outflow behavior can be achieved in this way.
  • Fig. 2 should clarify the basic structure of a solid bowl screw centrifuge.
  • the drive along with the control, a hood and other elements that are self-evident to the person skilled in the art are not shown here.
  • Fig. 2 shows a solid bowl screw centrifuge 1 with a drum 3 rotatable about an axis of rotation D, in which a likewise rotatable screw 5 is arranged.
  • Radial directions perpendicular to the axis of rotation D are denoted by "R".
  • the drum 3 and the screw 5 each have an essentially cylindrical section and a section which tapers conically here.
  • An axially extending central inlet pipe 7 serves to feed the centrifuged material via a distributor 9 into the centrifugal chamber 11 between the screw 5 and the drum 3.
  • the screw 5 preferably rotates at a somewhat lower or greater speed than the drum 3 and conveys the ejected solid to the conical section from the drum 3 to the solid discharge 13.
  • the liquid flows to the larger drum diameter at the rear end of the cylindrical section of the drum 3 and is derived there by a weir which has passage openings 15 in a drum cover 17, each passage opening 15 being assigned a weir plate 19, which is attached here radially adjustable to the outside of the drum cover.
  • the inner radial edge of the weir plate 19 thus defines an overflow edge and thus also the actual weir or the overflow weir 21.
  • the liquid flows out of the drum at the overflow weir 21, which rotates in the circumferential direction U with the drum 1, so that the liquid which flows in Direction X parallel to the axis of rotation D flows over the overflow weir 21, in addition to the axial speed component as a result of the outflow from the drum, in particular also a speed in the circumferential direction U (perpendicular to the image plane of FIG Fig. 1 , see also Fig. 2 ) and a radial component caused by the centrifugal force from the center of rotation to the outside.
  • the drum lid with drain weirs 23 in the manner of Fig. 1 are provided, which replace the weir plate 19, in particular in order to achieve energy savings.
  • the drain weirs 23 each in turn each have a flange-like weir plate 25 which is arranged on the drum cover.
  • the weir plates 25 are provided with holes 27 for attachment to the drum cover 17 in order to screw the respective weir plate to the drum cover 17 by means of bolts (not shown here).
  • This attachment is simple and preferred. However, other types of attachment of the weir plate (s) 25 to the drum cover are also conceivable.
  • the weir plate 25 is designed as a ring segment, it being advantageous (but not absolutely necessary) - in particular in order to avoid quiet running by avoiding gaps and the like. - if the ring segments lie directly or very close to one another in the circumferential direction and are in such a manner circumferential ring from the weir plates 25 forms.
  • the weir plate (s) 25 can also have a different shape, for example a rectangular or a semicircular shape.
  • the 1a-c only show one of the weirs 23.
  • Each weir plate 25 as the base of the drain weir has - with respect to the axis of rotation D - an inner edge 25a and an outer edge 25b in the form of a section of a circular arc and two circumferential edges 25c and 25d which are oriented radially to the axis of rotation D here.
  • This configuration is also advantageous because a circumferential ring can easily be formed, but not necessarily.
  • a recess 29 is formed, which extends from the inner edge 25a - based on the mounted state on the drum cover 17 - to the outside and ends radially a little before the outer edge 25b.
  • the recess 29 has a first edge section 29a which extends preferably radially or at a small angle relative to the radial (angle ⁇ preferably less than 25 °) and a second edge section which is preferably oriented perpendicularly or substantially perpendicularly to the first edge section 29a 29b, which preferably runs tangentially or essentially tangentially (angle to the tangential direction 0 ° or less than 20 °) to an imaginary circle with a radius r b to the axis of rotation D.
  • At least the edge section 29b is preferably aligned with a corresponding opening in the actual drum cover located under the weir plate 25 (not shown here; however, see Fig. 1 ).
  • the edge section 29b essentially forms the overflow edge, via which liquid emerges axially from the drum.
  • the side of the second edge section 29b facing away from the first edge section 29a is preferably adjoined by a (third) edge section 29c which is at an obtuse angle relative to the second edge section, and is preferably followed by a fourth edge section 29d, which here is arc-shaped and the third edge section with the circular arc Inner edge 25a of the weir plate 25 connects.
  • a (third) edge section 29c which is at an obtuse angle relative to the second edge section
  • a fourth edge section 29d which here is arc-shaped and the third edge section with the circular arc Inner edge 25a of the weir plate 25 connects.
  • a drainage channel is also formed at the recess 29, which is open radially inwards (towards the axis of rotation) and which has a bottom and two side walls, one of which is formed from a guide plate piece 31a is and a part of the weir plate 25 itself.
  • baffle piece 31a and two baffle pieces 31b, c forming the bottom serve, in combination with the weir plate 25, to deflect a liquid stream emerging axially from the drum through the recess 29 essentially in the direction of the direction of rotation K in the direction K, which as a result of the the deflection resulting additional drive effect in the circumferential direction leads to an energy-efficient operation.
  • the guide plate pieces 31a, b and / or c can also be formed as sections of a single superordinate and correspondingly bent or cast guide plate, or can be connected to one another, for example by welding.
  • the three guide plate pieces 31a, b, c and the weir plate 25 together form the discharge channel open towards the axis of rotation D.
  • the first baffle piece 31a is preferably formed at right angles to the second and third baffle pieces 31b, c. It not only forms the side wall of the drainage channel, but also ensures the actual deflection of the liquid jet from the axial direction X into a circumferential direction perpendicular thereto - K.
  • the first guide plate piece 31a as the side wall of the drainage channel, directly adjoins the first edge section 29a of the recess 29 with its side or surface facing the drum.
  • the angle ⁇ between the plane of the weir plate 25 as the base plate and the first guide plate piece 31a preferably 0 ° or greater than 0 ° and less than 45 °, preferably should be less than or equal to 15 ° (see Fig. 1c ).
  • the reference edge for the angle ⁇ is perpendicular to the weir plate and is measured on the inner edge of the baffle piece and the weir plate.
  • the first baffle piece 31a has the radius or the bend 31a "and then extends in the section 31a"'' preferably up to parallel or preferably slightly inclined towards the weir plate.
  • the angle ⁇ is formed, for which applies: ⁇ > 0 ° and ⁇ ⁇ 30 °, in particular ⁇ ⁇ 20 °.
  • the baffle piece 31a can thus again have a plurality of sections or even individual pieces or components.
  • the baffle piece here has a flat section 31a ', a radius 31a "and an adjoining flat section 31a"'.
  • the radius is particularly important since it mainly causes the deflection, so that the first baffle piece even up to a radius or curved section could also be reduced.
  • the first baffle piece 31a also adjoins the second and third baffle pieces 31b, c as the side wall of the gutter, which form the bottom of the gutter.
  • the second and third baffle pieces 31b, c are preferably perpendicular or substantially perpendicular (angle between 90 ° and 110 °) to the plane of the drum cover or weir plate 25 (which is perpendicular to the axis of rotation) and on the outside of the weir plate 25 ( arranged in the assembled position on the drum) and preferably material-connecting (eg welded).
  • the second guide plate piece 31b is preferably aligned with the second edge end section 29b.
  • the third baffle piece 31c is aligned with the third edge section 29c, but is longer than the third edge section 29c and preferably deflects the emerging liquid jet from the tangential direction somewhat inwards towards the axis of rotation.
  • the corresponding angle ⁇ between the tangential direction T and the outflow direction A from the bottom of the drainage channel - here from the third baffle piece 31c - to the axis of rotation is preferably greater than 0 ° and less than 25 °.
  • the baffle pieces can be sections of a sheet or separate sheet metal elements. Again, they can each consist of several subsegments or pieces or be divided into such.
  • Liquid emerging from the drum is deflected by the first baffle piece 31a in the circumferential direction of the drum and against the direction of rotation K of the drum.
  • An angle ⁇ of the overflow edge can be 0 ° to the radial R or up to ⁇ 10 °, preferably ⁇ 5 °.
  • the base - formed here from the first and the second baffle piece 31b, c - of the inwardly open drainage channel prevents the deflected liquid from splashing outwards. Rather, the bottom ensures that the liquid jet is passed on in the circumferential direction to the end of the bottom of the drainage channel, where the liquid jet leaves the drainage channel in direction A at the drainage edge / overflow edge 31 h.
  • the liquid jet deflected in the circumferential direction is first guided essentially tangentially through the bottom of the drainage channel - here through the second guide plate piece 31b - and then through the third guide plate piece 31c oriented at an obtuse angle even from the tangential direction T to the axis of rotation and leaves the third Baffle piece 31c in the direction defined by the orientation of this baffle piece 31c, whereby the energy gain is particularly large.
  • a single drainage channel and a single recess 29 are preferably formed on each weir plate. However, several drainage channels and recesses 29 can also be formed on a single weir plate.
  • baffle piece 31 is not to be understood too narrowly. These preferably each consist of a section of a metal sheet. However, in the sense of this application, “guide plate pieces” made of non-metallic materials are also conceivable, provided that these are suitable for performing the necessary deflecting and guiding function for the liquid.
  • the area of the recess 29 up to the inner edge 25a of the weir plate 25 should preferably be smaller, in particular 25% or more smaller, preferably 30% smaller, than the imaginary cross section - the imagined cross-sectional area - of the drainage channel in the area of the overflow edge (which can essentially be calculated as the product of the floor width with the height of the discharge channel), which is defined by the height of the baffle piece 31a in the area of the overflow edge 31 h.
  • the area or cross-section of the recess 29 should preferably be equal to or larger than the imaginary cross-section of the discharge channel at the overflow edge, since this again results in excellent outflow behavior.

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  • Centrifugal Separators (AREA)

Description

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.Solid bowl screw centrifuges are known in various embodiments.

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. Der Durchlass weist ferner Düsen zum Auslass der geklärten Flüssigkeit auf, welche zur Energieeinsparung entsprechend in Umfangsrichtung - insbesondere tangential - ausgerichtet sind.So the reveals DE 102 03 652 B4 a solid-bowl screw centrifuge with a device for discharging clarified liquid from a drum, which has a drum cover with a passage, to which a throttle device, in particular a throttle disc, is assigned, the distance of which from the passage is variable. The passage also has nozzles for the outlet of the clarified liquid, which are aligned in the circumferential direction, in particular tangentially, to save energy.

Düsen an Vollmantelschneckenzentrifugen und ihr Effekt der Energieeinsparung bei entsprechender Ausrichtung geneigt zur Trommelachse sind ferner aus der DE 39 04 151 A1 bekannt.Nozzles on solid bowl centrifuges and their effect of saving energy with an appropriate orientation inclined to the drum axis are also from the DE 39 04 151 A1 known.

Die Veröffentlichung "Patent Abstracts of Japan", Nummer 11179236 A , offenbart demgegenüber, dass Durchlassöffnungen im Trommeldeckel, die jeweils teilweise von einer Wehrplatte verschlossen sind, welche ein Überlaufwehr bilden, Leitbleche zugeordnet werden können, welche der aus der Trommel austretenden Flüssigkeit einen Drall geben, wobei der auftretende Rückstoßeffekt zur 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 Trommeldrehachse ausgerichtet sind, wobei die Ebene, in welcher die ebenen 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.The publication "Patent Abstracts of Japan", number 11179236 A , on the other hand, discloses that passage openings in the drum cover, which are each partially closed by a weir plate, which form an overflow weir, can be assigned baffles which give a swirl to the liquid emerging from the drum, the recoil effect occurring being used to save energy. The baffles are attached to the outside of the overflow weir, for example on the weir plates. They are designed, for example, as flat sheets, which are aligned parallel to the axis of rotation of the drum, the plane in which the flat sheets lie, does not intersect the axis of the drum and encloses an angle of approximately 45 ° with the radial straight line, which in each case through the axis of rotation of the drum and the respective passage opening runs.

Es ist auch bekannt - so aus der US 2004/0072668 A1 oder der WO 2008/138345 A1 - anstelle eines Überlaufwehrs an der Wehrplatte der Durchlassöffnung ein Gehäuse anzuordnen, wobei dann das Überlaufwehr oder eine Düse in einer Schrägseite des Gehäuses an der Durchlassöffnung ausgebildet werden. Diese Konstruktionen bringen jedoch den Nachteil mit sich, dass an der Außenseite des Trommeldeckels mitrotierende, relativ kompliziert geformte 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 und Unwuchtprobleme mit sich bringen.It is also known - so from the US 2004/0072668 A1 or the WO 2008/138345 A1 - To arrange a housing instead of an overflow weir on the weir plate of the passage opening, in which case the overflow weir or a nozzle are formed in an inclined side of the housing at the passage opening. However, these constructions have the disadvantage that relatively complex shaped liquid chambers are formed on the outside of the drum cover, which form part of the rotating system, so that the clarification or separation process continues in the liquid chambers. This separation process can result in undesirable deposits in the chambers, which lead to cleaning problems and unbalance problems.

Aus diesem Grund wenden sich die DE 10 2010 032 503 A1 und die DE 10 2010061 563 A1 von dem zuletzt beschriebenen Weg ab.For this reason, the DE 10 2010 032 503 A1 and the DE 10 2010061 563 A1 from the path described last.

Nach der DE 10 2010 032 503 A1 wird das Überlaufwehr direkt an den Wehrplatten am Trommeldeckel belassen und es wird erst die Flüssigkeit, welche das rotierende System bereits über das Überlaufwehr verlassen hat, in Umfangsrichtung umgelenkt. Nach dem Austritt aus der Trommel kann kein Kläreffekt mehr auftreten, der gesamte austretende Flüssigkeitsstrahl wird vielmehr durch die Ablenkeinrichtung in Umfangsrichtung abgelenkt.After DE 10 2010 032 503 A1 the overflow weir is left directly on the weir plates on the drum cover and the liquid that has already left the rotating system via the overflow weir is deflected in the circumferential direction. After exiting the drum, a clearing effect can no longer occur; the entire emerging liquid jet is rather deflected in the circumferential direction by the deflection device.

Nach der DE 10 2010061 563 A1 ist vorgesehen, dass die Wehrplatte eine Materialausnehmung aufweist, welche zumindest einen Teil einer Ableitungsrinne oder eine vollständige Ableitungsrinne ausbildet, wobei die Ableitungsrinne derart ausgebildet ist, dass sie aus der Trommel austretende Strömung geeignet umlenkt.After DE 10 2010061 563 A1 It is provided that the weir plate has a material recess which forms at least part of a discharge channel or a complete discharge channel, the discharge channel being designed in such a way that it deflects flow emerging from the drum in a suitable manner.

Damit haben sich die beiden zuletzt diskutierten Ausgestaltungen an sich bewährt. Dennoch besteht weiterer Bedarf zur Optimierung, insbesondere in Hinsicht auf einen guten Energierückgewinn bei gleichzeitiger Gewährleistung einer geringen Verschmutzungsneigung.Thus, the two configurations discussed last have proven themselves. Nevertheless, there is still a need for optimization, particularly with regard to good energy recovery while ensuring a low tendency to pollution.

Die Lösung des vorstehend beschriebenen Problems ist die Aufgabe der Erfindung.The object of the invention is to solve the problem described above.

Die Erfindung löst diese Aufgabe durch den Gegenstand des Anspruchs 1.The invention solves this problem by the subject matter of claim 1.

Danach ist vorgesehen, dass der Boden der Ableitungsrinne zur Überströmkante hin relativ zur Tangentialrichtung um einen Neigungswinkel δ > 0° an der Stelle der Überströmkante nach innen zur Drehachse hin geneigt ist.According to this, it is provided that the bottom of the discharge channel is inclined toward the overflow edge relative to the tangential direction by an angle of inclination δ> 0 ° at the location of the overflow edge inwards towards the axis of rotation.

Ein Hauptvorteil dieser Ausgestaltung besteht wiederum darin, dass sich nicht wie bei den Gehäusen nach Art der WO 2008/138345 A1 leicht Produktablagerungen bilden können. Durch die offene Gestaltung der Ableitungsrinnen wird dieser Nachteil vielmehr erneut vermieden. Dabei ist die konstruktive Ausgestaltung einfach und stabil. Zudem wird der austretende Produktstrom so auf einen radialen Durchmesser umgelenkt, dass sich eine besonders große Energieeinsparung ergibt.A main advantage of this configuration is again that, as in the case of the type of WO 2008/138345 A1 can easily form product deposits. This disadvantage is avoided again by the open design of the drainage channels. The design is simple and stable. In addition, the emerging product stream is deflected to a radial diameter in such a way that a particularly large amount of energy is saved.

Vorzugsweise gilt dabei für den Neigungswinkel δ: δ > 0° und δ < 25°, insbesondere δ ≥ 10° und δ ≤ 20°, da sich derart ein besonders vorteilhaftes Abströmverhalten erzielen lässt.The following preferably applies for the angle of inclination δ: δ> 0 ° and δ <25 °, in particular δ 10 10 ° and δ 20 20 °, since a particularly advantageous outflow behavior can be achieved in this way.

Vorteilhafte Ausgestaltungen der Erfindung sind den Unteransprüchen zu entnehmen.Advantageous embodiments of the invention can be found in the subclaims.

Nachfolgend wird die Erfindung unter Bezug auf die Zeichnung näher beschrieben. Es zeigt:

Fig. 1a-c
verschiedene Ansichten eines Segmentes eines schematisch dargestellten Trommeldeckels einer erfindungsgemäßen Vollmantel-Schneckenzentrifuge; und
Fig. 2
eine schematische Ansicht einer bekannten Vollmantel-Schneckenzentrifuge.
The invention is described in more detail below with reference to the drawing. It shows:
1a-c
different views of a segment of a schematically represented drum cover of a solid bowl screw centrifuge according to the invention; and
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 should clarify the basic structure of a solid bowl screw centrifuge. The drive along with the control, a hood and other elements that are self-evident to the person skilled in the art are not shown here.

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. Radialrichtungen senkrecht zur Drehachse D sind mit "R" bezeichnet. Fig. 2 shows a solid bowl screw centrifuge 1 with a drum 3 rotatable about an axis of rotation D, in which a likewise rotatable screw 5 is arranged. Radial directions perpendicular to the axis of rotation D are denoted by "R".

Die Trommel 3 und die Schnecke 5 weisen jeweils einen im Wesentlichen zylindrischen Abschnitt und einen sich hier konisch verjüngenden Abschnitt auf.The drum 3 and the screw 5 each have an essentially cylindrical section and a section which tapers conically here.

Ein sich axial erstreckendes zentrisches Einlaufrohr 7 dient zur Zuleitung des Schleudergutes über einen Verteiler 9 in den Schleuderraum 11 zwischen der Schnecke 5 und der Trommel 3.An axially extending central inlet pipe 7 serves to feed the centrifuged material via a distributor 9 into the centrifugal chamber 11 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.If, for example, a muddy slurry is fed into the centrifuge, coarser solid particles settle on the drum wall. A liquid phase forms further towards the inside.

Die Schnecke 5 rotiert vorzugsweise 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 Durchlassöffnung 15 eine Wehrplatte 19 zugeordnet ist, welche hier radial verstellbar an der Außenseite des Trommeldeckels angebracht ist. Die innere radiale Kante der Wehrplatte 19 definiert damit eine Überlaufkante und damit auch das eigentliche Wehr bzw. das Überlaufwehr 21. Die Flüssigkeit strömt am Überlaufwehr 21 aus der Trommel, welches in Umfangsrichtung U mit der Trommel 1 rotiert, so dass die Flüssigkeit, die in Richtung X parallel zur Drehachse D über das Überlaufwehr 21 strömt, neben der axialen Geschwindigkeitskomponente infolge des Ausströmens aus der Trommel insbesondere auch eine Geschwindigkeit in Umfangsrichtung U (senkrecht zur Bildebene der Fig. 1, siehe auch Fig. 2) sowie eine durch die Zentrifugalkraft bewirkte radiale Komponente vom Rotationszentrum nach außen aufweist.The screw 5 preferably rotates at a somewhat lower or greater speed than the drum 3 and conveys the ejected solid to the conical section from the drum 3 to the solid discharge 13. The liquid, on the other hand, flows to the larger drum diameter at the rear end of the cylindrical section of the drum 3 and is derived there by a weir which has passage openings 15 in a drum cover 17, each passage opening 15 being assigned a weir plate 19, which is attached here radially adjustable to the outside of the drum cover. The inner radial edge of the weir plate 19 thus defines an overflow edge and thus also the actual weir or the overflow weir 21. The liquid flows out of the drum at the overflow weir 21, which rotates in the circumferential direction U with the drum 1, so that the liquid which flows in Direction X parallel to the axis of rotation D flows over the overflow weir 21, in addition to the axial speed component as a result of the outflow from the drum, in particular also a speed in the circumferential direction U (perpendicular to the image plane of FIG Fig. 1 , see also Fig. 2 ) and a radial component caused by the centrifugal force from the center of rotation to the outside.

Erfindungsgemäß kann z.B. bei einer Vollmantel-Schneckenzentrifuge nach Art der Fig. 2 der Trommeldeckel mit Ablaufwehren 23 nach Art der Fig. 1 versehen werden, welche die Wehrplatte 19 ersetzen, insbesondere, um eine Energieeinsparung zu erreichen.According to the invention, for example, in the case of a solid-bowl screw centrifuge of the type of Fig. 2 the drum lid with drain weirs 23 in the manner of Fig. 1 are provided, which replace the weir plate 19, in particular in order to achieve energy savings.

Die Ablaufwehre 23 weisen jeweils wiederum jeweils eine flanschartige Wehrplatte 25 auf, die an dem Trommeldeckel angeordnet wird. Hier sind die Wehrplatten 25 zur Befestigung an dem Trommeldeckel 17 mit Bohrungen 27 versehen, um die jeweilige Wehrplatte mittels (hier nicht dargestellten) Bolzen an dem Trommeldeckel 17 festzuschrauben. Diese Befestigung ist einfach und bevorzugt. Es sind aber auch andere Arten der Befestigung der Wehrplatte(n) 25 an dem Trommeldeckel denkbar.The drain weirs 23 each in turn each have a flange-like weir plate 25 which is arranged on the drum cover. Here the weir plates 25 are provided with holes 27 for attachment to the drum cover 17 in order to screw the respective weir plate to the drum cover 17 by means of bolts (not shown here). This attachment is simple and preferred. However, other types of attachment of the weir plate (s) 25 to the drum cover are also conceivable.

Nach Fig. 1 ist die Wehrplatte 25 als ein Ringsegment ausgebildet, wobei es vorteilhaft (aber nicht zwingend erforderlich) ist - insbesondere um einen leisen Lauf durch Vermeidung von Spalten und dgl. zu vermeiden - wenn die Ringsegmente in Umfangsrichtung direkt oder sehr nah aneinander liegen und sich derart ein umlaufender Ring aus den Wehrplatten 25 bildet. Die Wehrplatte(n) 25 kann/können aber auch eine andere Form aufweisen, so z.B. eine rechteckige oder eine halbkreisartige Form.To Fig. 1 the weir plate 25 is designed as a ring segment, it being advantageous (but not absolutely necessary) - in particular in order to avoid quiet running by avoiding gaps and the like. - if the ring segments lie directly or very close to one another in the circumferential direction and are in such a manner circumferential ring from the weir plates 25 forms. The weir plate (s) 25 can also have a different shape, for example a rectangular or a semicircular shape.

Die Fig. 1a-c zeigen lediglich ein einziges der Ablaufwehre 23.The 1a-c only show one of the weirs 23.

Jede Wehrplatte 25 als Basis des Ablaufwehres weist - bezogen auf die Drehachse D - eine kreisbogenabschnittsartige Innenkante 25a und eine Außenkante 25b sowie zwei hier radial zur Drehachse D ausgerichtete Umfangskanten 25c und 25d auf. Auch diese Ausgestaltung ist vorteilhaft, da sich leicht ein umlaufender Ring bilden lässt, nicht aber zwingend.Each weir plate 25 as the base of the drain weir has - with respect to the axis of rotation D - an inner edge 25a and an outer edge 25b in the form of a section of a circular arc and two circumferential edges 25c and 25d which are oriented radially to the axis of rotation D here. This configuration is also advantageous because a circumferential ring can easily be formed, but not necessarily.

In der Innenkante 25a - siehe insbesondere Fig. 1b - ist eine Aussparung 29 ausgebildet, welche sich von der Innenkante 25a - bezogen auf den montierten Zustand am Trommeldeckel 17 - nach außen hin erstreckt und ein Stück vor der Außenkante 25b radial endet.In the inner edge 25a - see in particular Fig. 1b - A recess 29 is formed, which extends from the inner edge 25a - based on the mounted state on the drum cover 17 - to the outside and ends radially a little before the outer edge 25b.

Nach Fig. 1 a und b weist die Aussparung 29 einen sich in vorzugsweise radial oder unter einem kleinen Winkel relativ zur Radialen (Winkel γ vorzugsweise kleiner 25°) erstreckenden ersten Kantenabschnitt 29a auf und einen vorzugsweise senkrecht oder im Wesentlichen senkrecht zu dem ersten Kantenabschnitt 29 a ausgerichteten zweite Kantenabschnitt 29b, der vorzugsweise tangential oder im Wesentlichen tangential (Winkel zur Tangentialrichtung 0° oder kleiner 20°) zu einem gedachten Kreis mit einem Radius rb zur Drehachse D verläuft.To Fig. 1 a and b, the recess 29 has a first edge section 29a which extends preferably radially or at a small angle relative to the radial (angle γ preferably less than 25 °) and a second edge section which is preferably oriented perpendicularly or substantially perpendicularly to the first edge section 29a 29b, which preferably runs tangentially or essentially tangentially (angle to the tangential direction 0 ° or less than 20 °) to an imaginary circle with a radius r b to the axis of rotation D.

Zumindest der Kantenabschnitt 29b fluchtet vorzugsweise mit einer unter der Wehrplatte 25 liegenden entsprechenden Öffnung im eigentlichen Trommeldeckel (hier nicht dargestellt; siehe aber Fig. 1). Der Kantenabschnitt 29b bildet im Wesentlichen die Überlaufkante, über welche Flüssigkeit axial aus der Trommel tritt.At least the edge section 29b is preferably aligned with a corresponding opening in the actual drum cover located under the weir plate 25 (not shown here; however, see Fig. 1 ). The edge section 29b essentially forms the overflow edge, via which liquid emerges axially from the drum.

An die von dem ersten Kantenabschnitt 29a abgewandte Seite des zweiten Kantenabschnitts 29b schließt sich vorzugsweise ein relativ zum zweiten Kantenabschnitt sich stumpfwinklig anschließender (dritter) Kantenabschnitt 29c an und an diesen vorzugsweise ein vierter Kantenabschnitt 29d, der hier bogenförmig ist und den dritten Kantenabschnitt mit der kreisbogenförmigen Innenkante 25a der Wehrplatte 25 verbindet. Das Ausströmverhalten an dieser Aussparung hat sich als vorteilhaft erwiesen.The side of the second edge section 29b facing away from the first edge section 29a is preferably adjoined by a (third) edge section 29c which is at an obtuse angle relative to the second edge section, and is preferably followed by a fourth edge section 29d, which here is arc-shaped and the third edge section with the circular arc Inner edge 25a of the weir plate 25 connects. The outflow behavior at this recess has proven to be advantageous.

An der im montierten Zustand vom Trommeldeckel abgewandten Außenseite der Wehrplatte 25 ist an der Aussparung 29 ferner eine Ableitungsrinne ausgebildet, welche radial nach innen (zur Drehachse) hin offen ist und welche einen Boden aufweist sowie zwei Seitenwände, von denen eine aus einem Leitblechstück 31a gebildet ist und eine aus einem Teil der Wehrplatte 25 selbst.On the outside of the weir plate 25 facing away from the drum cover in the assembled state, a drainage channel is also formed at the recess 29, which is open radially inwards (towards the axis of rotation) and which has a bottom and two side walls, one of which is formed from a guide plate piece 31a is and a part of the weir plate 25 itself.

Das Leitblechstück 31a sowie zwei den Boden bildende Leitblechstücke 31b, c dienen insgesamt im Zusammenspiel mit der Wehrplatte 25 dazu, einen aus der Trommel durch die Aussparung 29 axial austretenden Flüssigkeitsstrom im Wesentlichen entgegen der Drehrichtung K in Richtung -K umzulenken, was infolge des sich durch die Umlenkung ergebenden zusätzlichen Antriebseffektes in Umfangsrichtung zu einem in energetischer Hinsicht günstigen Betrieb führt.The baffle piece 31a and two baffle pieces 31b, c forming the bottom serve, in combination with the weir plate 25, to deflect a liquid stream emerging axially from the drum through the recess 29 essentially in the direction of the direction of rotation K in the direction K, which as a result of the the deflection resulting additional drive effect in the circumferential direction leads to an energy-efficient operation.

Die Leitblechstücke 31a, b und/oder c können auch aus als Abschnitte eines einzigen übergeordneten und entsprechend zurecht gebogenen oder gegossenen Leitbleches ausgebildet sein, oder miteinander verbunden sein, so durch Verschweißen.The guide plate pieces 31a, b and / or c can also be formed as sections of a single superordinate and correspondingly bent or cast guide plate, or can be connected to one another, for example by welding.

Wie bereits erläutert, bilden die drei Leitblechstücke 31a, b, c, und die Wehrplatte 25 selbst zusammen die zur Drehachse D hin offene Ableitungsrinne aus.As already explained, the three guide plate pieces 31a, b, c and the weir plate 25 together form the discharge channel open towards the axis of rotation D.

Das erste Leitblechstück 31a ist vorzugsweise rechtwinklig zu dem zweiten und dem dritten Leitblechstück 31b, c ausgebildet. Es bildet nicht nur die Seitenwand der Ablaufrinne sondern sorgt auch für die eigentliche Umlenkung des Flüssigkeitsstrahles aus der Axialrichtung X in eine hierzu senkrechte Umfangsrichtung - K.The first baffle piece 31a is preferably formed at right angles to the second and third baffle pieces 31b, c. It not only forms the side wall of the drainage channel, but also ensures the actual deflection of the liquid jet from the axial direction X into a circumferential direction perpendicular thereto - K.

Das erste Leitblechstück 31a schließt sich als Seitenwand der Ablaufrinne mit seiner zur Trommel gewandten Seite bzw. Fläche direkt an den ersten Kantenabschnitt 29a der Aussparung 29 an.The first guide plate piece 31a, as the side wall of the drainage channel, directly adjoins the first edge section 29a of the recess 29 with its side or surface facing the drum.

Es ist hier in bevorzugter Ausgestaltung nicht senkrecht zu der Wehrplatte bzw. dem Trommeldeckel darunter angeordnet sondern spitzwinklig, wobei der Winkel α zwischen der Ebene der Wehrplatte 25 als Basisblech und dem ersten Leitblechstück 31a vorzugsweise 0° oder größer 0° und kleiner 45°, vorzugsweise kleiner gleich 15° sein sollte (siehe Fig. 1c). Die Bezugskante für den Winkel α steht senkrecht auf der Wehrplatte und wird an der Innenkante des Leitblechstückes und der Wehrplatte gemessen.In a preferred embodiment, it is not arranged perpendicular to the weir plate or the drum cover below but at an acute angle, the angle α between the plane of the weir plate 25 as the base plate and the first guide plate piece 31a preferably 0 ° or greater than 0 ° and less than 45 °, preferably should be less than or equal to 15 ° (see Fig. 1c ). The reference edge for the angle α is perpendicular to the weir plate and is measured on the inner edge of the baffle piece and the weir plate.

Hierdurch wird eine erste Umlenkung der Flüssigkeit aus der Axialrichtung mehr in Umfangsrichtung erreicht. Sodann weist das erste Leitblechstück 31a den Radius bzw. die Biegung 31a" auf und erstreckt sich dann im Abschnitt 31a''' vorzugsweise bis parallel oder vorzugsweise etwas geneigt zur Wehrplatte hin. Vorzugsweise ist dabei zwischen der Ebene der Wehrplatte 25 und der Ebene, in welcher der ebene Abschnitt 31''' liegt bzw. bis in welche hinein sich die Biegung des ersten Leitblechstückes (31a) erstreckt, der Winkel β ausgebildet, für den gilt: β > 0° und β < 30°, insbesondere β < 20°.As a result, a first deflection of the liquid from the axial direction is achieved more in the circumferential direction. Then the first baffle piece 31a has the radius or the bend 31a "and then extends in the section 31a"'' preferably up to parallel or preferably slightly inclined towards the weir plate. Preferably, between the plane of the weir plate 25 and the plane, in which is the flat section 31 '''or into which the bend of the first Baffle piece (31a) extends, the angle β is formed, for which applies: β> 0 ° and β <30 °, in particular β <20 °.

Das Leitblechstück 31a kann somit in sich auch wieder mehrere Abschnitte oder sogar Einzelstücke bzw. Komponenten aufweisen. Aus Figur 1c ist ersichtlich: das Leitblechstück weist hier einen ebenen Abschnitt 31a' auf, einen Radius 31a" und einen sich daran anschließenden ebenen Abschnitt 31a'''. Besonders wesentlich ist der Radius, da er hauptsächlich die Umlenkung bewirkt, so dass das erste Leitblechstück sogar bis auch einen Radius bzw. gekrümmten Abschnitt reduziert werden könnte.The baffle piece 31a can thus again have a plurality of sections or even individual pieces or components. Out Figure 1c it can be seen: the baffle piece here has a flat section 31a ', a radius 31a "and an adjoining flat section 31a"'. The radius is particularly important since it mainly causes the deflection, so that the first baffle piece even up to a radius or curved section could also be reduced.

Wie bereits ausgeführt, grenzt das erste Leitblechstück 31a ferner als Seitenwand der Ablaufrinne an das zweite und das dritte Leitblechstück 31b, c an, welche den Boden der Ablaufrinne bilden.As already stated, the first baffle piece 31a also adjoins the second and third baffle pieces 31b, c as the side wall of the gutter, which form the bottom of the gutter.

Das zweite und das dritte Leitblechstück 31b, c sind vorzugsweise senkrecht oder im Wesentlichen senkrecht (Winkel zwischen 90° und 110°) zur Ebene des Trommeldeckels bzw. der Wehrplatte 25 (die senkrecht zur Drehachse liegt) ausgerichtet und an der Außenseite der Wehrplatte 25 (in montierter Stellung an der Trommel) angeordnet und vorzugsweise materialverbindend (z.B. schweißend befestigt).The second and third baffle pieces 31b, c are preferably perpendicular or substantially perpendicular (angle between 90 ° and 110 °) to the plane of the drum cover or weir plate 25 (which is perpendicular to the axis of rotation) and on the outside of the weir plate 25 ( arranged in the assembled position on the drum) and preferably material-connecting (eg welded).

Das zweite Leitblechstück 31b fluchtet dabei vorzugsweise mit dem zweiten Kantendabschnitt 29b. Das dritte Leitblechstück 31c fluchtet mit dem dritten Kantenabschnitt 29c, ist aber länger als der dritten Kantenabschnitt 29c und sorgt für eine Ablenkung des austretenden Flüssigkeitsstrahls aus der Tangentialrichtung vorzugsweise etwas nach innen zur Drehachse hin. Der entsprechende Winkel δ zwischen Tangentialrichtung T und der Abströmrichtung A vom Boden der Ablaufrinne - hier vom dritten Leitblechstück 31c - zur Drehachse hin ist vorzugsweise größer 0° und kleiner als 25°.The second guide plate piece 31b is preferably aligned with the second edge end section 29b. The third baffle piece 31c is aligned with the third edge section 29c, but is longer than the third edge section 29c and preferably deflects the emerging liquid jet from the tangential direction somewhat inwards towards the axis of rotation. The corresponding angle δ between the tangential direction T and the outflow direction A from the bottom of the drainage channel - here from the third baffle piece 31c - to the axis of rotation is preferably greater than 0 ° and less than 25 °.

Die Leitblechstücke können Abschnitte eines Bleches sein oder separate Blechelemente. Sie können auch wieder jeweils aus mehreren Untersegmenten oder Stücken bestehen oder in solche unterteilt sein.The baffle pieces can be sections of a sheet or separate sheet metal elements. Again, they can each consist of several subsegments or pieces or be divided into such.

Nachfolgend sei die Wirkungsweise der Ablaufrinne nochmals näher erläutert.The mode of operation of the drainage channel is explained in more detail below.

Aus der Trommel austretende Flüssigkeit wird durch das erste Leitblechstück 31a in Umfangsrichtung der Trommel und gegen die Drehrichtung K der Trommel umgelenkt. Vorzugsweise erfolgt sogar eine Umlenkung über einen Winkel γ von 0° bis max. 25° relativ zur Radialrichtung R etwas zum Basisblech bzw. zum darunter liegenden Trommeldeckel hin gerichtet, was positiv die Verstopfungsneigung weiter reduziert.Liquid emerging from the drum is deflected by the first baffle piece 31a in the circumferential direction of the drum and against the direction of rotation K of the drum. Preferably, there is even a deflection over an angle γ of 0 ° to max. 25 ° relative to the radial direction R a little towards the base plate or the drum cover underneath, which further reduces the tendency to blockage.

Ein Winkel ε der Überströmkante kann 0° zur Radialen R betragen oder bis zu ± 10°, vorzugsweise ± 5°.An angle ε of the overflow edge can be 0 ° to the radial R or up to ± 10 °, preferably ± 5 °.

Dabei hindert der Boden - gebildet hier aus dem ersten und dem zweiten Leitblechstück 31b, c - der nach innen offenen Ablaufrinne die umgelenkte Flüssigkeit daran, nach außen zu spritzen. Der Boden sorgt vielmehr für ein Weiterleiten des Flüssigkeitsstrahls in Umfangsrichtung bis zum Ende des Bodens der Ablaufrinne, wo der Flüssigkeitsstrahl an der Ablaufkante/Überströmkante 31 h die Ablaufrinne in Richtung A verlässt.The base - formed here from the first and the second baffle piece 31b, c - of the inwardly open drainage channel prevents the deflected liquid from splashing outwards. Rather, the bottom ensures that the liquid jet is passed on in the circumferential direction to the end of the bottom of the drainage channel, where the liquid jet leaves the drainage channel in direction A at the drainage edge / overflow edge 31 h.

Der in Umfangsrichtung umgelenkte Flüssigkeitsstrahl wird durch den Boden der Ablaufrinne - hier durch das zweite Leitblechstück 31b - zunächst im Wesentlichen tangential und dann durch das dazu stumpfwinklig ausgerichtete dritte Leitblechstück 31c sogar zur Drehachse hin aus der Tangentialrichtung T etwas nach innen hin geleitet und verlässt das dritte Leitblechstück 31c in der durch die Ausrichtung dieses Leitblechstückes 31 c definierten Richtung, wodurch der Energiegewinn besonders groß ist.The liquid jet deflected in the circumferential direction is first guided essentially tangentially through the bottom of the drainage channel - here through the second guide plate piece 31b - and then through the third guide plate piece 31c oriented at an obtuse angle even from the tangential direction T to the axis of rotation and leaves the third Baffle piece 31c in the direction defined by the orientation of this baffle piece 31c, whereby the energy gain is particularly large.

Vorzugsweise sind an jeder Wehrplatte eine einzige Ablaufrinne und eine einzige Aussparung 29 ausgebildet. Es können aber auch mehrere Ablaufrinnen und Aussparungen 29 an einer einzigen Wehrplatte ausgebildet sein.A single drainage channel and a single recess 29 are preferably formed on each weir plate. However, several drainage channels and recesses 29 can also be formed on a single weir plate.

Der Begriff des Leitblechstückes 31 ist nicht zu eng zu verstehen. Bevorzugt bestehen diese jeweils aus einem Abschnitt eines Metallblech. Es sind aber im Sinne dieser Anmeldung auch "Leitblechstücke" aus nichtmetallischen Werkstoffen denkbar, sofern diese die dazu geeignet sind, die notwendige Umlenk- und Leitfunktion für die Flüssigkeit erfüllen können.The term baffle piece 31 is not to be understood too narrowly. These preferably each consist of a section of a metal sheet. However, in the sense of this application, “guide plate pieces” made of non-metallic materials are also conceivable, provided that these are suitable for performing the necessary deflecting and guiding function for the liquid.

Als sehr vorteilhaft zu erwähnen ist noch, dass die Fläche der Aussparung 29 bis zur Innenkante 25a der Wehrplatte 25 vorzugsweise kleiner sein sollte, insbesondere um 25% oder mehr kleiner, vorzugsweise 30% kleiner, als der gedachte Querschnitt - die gedachte Querschnittsfläche - der Ableitungsrinne im Bereich der Überströmkante (die sich im Wesentlichen als das Produkt der Bodenbreite mit der Höhe der Ableitungsrinne berechnen lässt), welche durch die Höhe des Leitblechstückes 31a im Bereich der Überströmkante 31 h definiert ist. Dabei sollte die Fläche bzw. der Querschnitt der Aussparung 29 vorzugsweise gleich oder größer als der fiktive gedachte Querschnitt der Ableitungsrinne an der Überströmkante, da sich derart ein wiederum hervorragendes Abströmverhalten ergibt. Bezugszeichen Vollmantel-Schneckenzentrifuge 1 Trommel 3 Schnecke 5 Einlaufrohr 7 Verteiler 9 Schleuderraum 11 Feststoffaustrag 13 Durchlassöffnungen 15 Trommeldeckel 17 Wehrplatte 19 Ablaufwehr 21 Ablaufwehre 23 Wehrplatte 25 Innenkante 25a Außenkante 25b Umfangskanten 25c, 25d Bohrungen 27 Aussparung 29 Kantenabschnitte 29a, b, c, d Drehachse D Radius rb Leitelemente 31a, b, c Überströmkante 31h Drehrichtung K Axialrichtung X Winkel α, β. γ, δ Radius rb Radialrichtung R It should also be mentioned as very advantageous that the area of the recess 29 up to the inner edge 25a of the weir plate 25 should preferably be smaller, in particular 25% or more smaller, preferably 30% smaller, than the imaginary cross section - the imagined cross-sectional area - of the drainage channel in the area of the overflow edge (which can essentially be calculated as the product of the floor width with the height of the discharge channel), which is defined by the height of the baffle piece 31a in the area of the overflow edge 31 h. The area or cross-section of the recess 29 should preferably be equal to or larger than the imaginary cross-section of the discharge channel at the overflow edge, since this again results in excellent outflow behavior. <B> reference numerals </ b> Solid bowl centrifuge 1 drum 3 slug 5 inlet pipe 7 distributor 9 centrifugal chamber 11 solids 13 Passage openings 15 drum lid 17 weir plate 19 outlet weir 21 flow weirs 23 weir plate 25 inner edge 25a outer edge 25b peripheral edges 25c, 25d drilling 27 recess 29 edge portions 29a, b, c, d axis of rotation D radius rb baffles 31a, b, c overflow edge 31h direction of rotation K axially X angle α, β. γ, δ radius r b radial direction R

Claims (19)

  1. A solid-bowl screw centrifuge with at least one or more discharge weirs (23) for discharging clarified liquid out of a drum (3) which has a rotational axis (D) and a direction of rotation (K), having the following features:
    a. at least one or more outlet ports (15) in a drum cover (17),
    b. wherein a weir plate (25), which has a recess (29), is associated with the at least one outlet port (15) in each case,
    c. wherein an open discharge channel, by means of which a deflection from a direction parallel to the rotational axis (D) of the drum essentially into a circumferential direction opposite the direction of rotation (K) is carried out, is formed at the outlet opening in the recess (29),
    d. wherein the discharge channel is designed in such a way that discharging liquid is directed via the bottom of the discharge channel up to an overflow edge (31h),
    characterized in that
    e. the bottom of the discharge channel is inclined inwardly toward the rotational axis (D) toward the overflow edge (31h) relative to the tangential direction (T) by an inclination angle δ > 0° at the location of the overflow edge (31h).
  2. The solid-bowl screw centrifuge as claimed in claim 1, characterized in that δ > 10° and δ < 25° apply to the inclination angle δ.
  3. The solid-bowl screw centrifuge as claimed in claim 2, characterized in that δ ≥ 10° and δ ≤ 20° apply to the inclination angle δ.
  4. The solid-bowl screw centrifuge as claimed in claim 1, characterized in that the bottom of the discharge channel is formed from one or more guide plate pieces (31b, c).
  5. The solid-bowl screw centrifuge as claimed in one of the preceding claims, characterized in that the side walls of the discharge channel are formed from an additional guide plate piece (31a) and the weir plate (25).
  6. The solid-bowl screw centrifuge as claimed in one of the preceding claims 4 or 5, characterized in that the first guide plate piece (31a), which forms a side wall, has an arced shape or at least one arc-shaped section (31a").
  7. The solid-bowl screw centrifuge as claimed in claim 6, characterized in that the first guide plate piece (31a) also has one or two flat section (31a', 31a''').
  8. The solid-bowl screw centrifuge as claimed in one of the preceding claims 4 to 7, characterized in that the first guide plate piece (31a) in itself is formed in one piece or in a multiple of pieces.
  9. The solid-bowl screw centrifuge as claimed in one of the preceding claims 4 to 8, characterized in that a plurality of guide plate pieces are formed from a single plate element.
  10. The solid-bowl screw centrifuge as claimed in one of the preceding claims 4 to 9, characterized in that the guide plate pieces or sections of the guide plate pieces are interconnected, preferably by welding.
  11. The solid-bowl screw centrifuge as claimed in one of the preceding claims 4 to 10, characterized in that the first guide plate piece (31a), as a side wall of the discharge channel, by its side or surface facing the drum, directly adjoins a first edge section (29a) of the recess (29) and in that the angle α between the plane of the weir plate (25) and the first guide plate piece (31a) is preferably between 0 and 45°, especially between 5° and 25°.
  12. The solid-bowl screw centrifuge as claimed in one of the preceding claims 4 to 11, characterized in that an angle β, to which β > 0° and β < 30°, especially β < 20°, applies, is formed between the plane of the weir plate (25) and the plane into which extends the bend of the first guide plate piece (31a).
  13. The solid-bowl screw centrifuge as claimed in one of the preceding claims 4 to 12, characterized in that the second guide plate piece (31b), which forms part of the bottom, is preferably oriented perpendicularly, or in the main perpendicularly, to the weir plate (25) and tangentially, or in the main tangentially, to the circumferential direction.
  14. The solid-bowl screw centrifuge as claimed in one of the preceding claims 4 to 13, characterized in that the second and third guide plate piece (31b, c), which form the bottom, align totally or partially with the corresponding edges of the recess (29) in the weir plate (25).
  15. The solid-bowl screw centrifuge as claimed in one of the preceding claims, characterized in that the at least one recess (29) in the weir plate has one or more straight edge sections (29a, b, c).
  16. The solid-bowl screw centrifuge as claimed in claim 15, characterized in that the at least one recess (29) in the weir plate has, at least in certain sections, at least one curved arc-shaped edge section (29d).
  17. The solid-bowl screw centrifuge as claimed in one of the preceding claims 15 or 16, characterized in that the cross-sectional area of the recess (29) up to the inner edge (25a) of the weir plate (25) is smaller than the imaginary cross section of the drain channel in the region of the overflow edge (31h).
  18. The solid-bowl screw centrifuge as claimed in claim 17, characterized in that the cross-sectional area of the recess (29) up to the inner edge (25a) of the weir plate (25) is by more than 25% smaller than the imaginary cross section of the drain channel in the region of the overflow edge (31h).
  19. The solid-bowl screw centrifuge as claimed in claim 18, characterized in that the cross-sectional area of the recess (29) up to the inner edge (25a) of the weir plate (25) is by more than 30% smaller than the imaginary cross section of the drain channel in the region of the overflow edge (31h).
EP13736864.3A 2012-07-11 2013-07-05 Solid-bowl screw centrifuge with overflow weir Active EP2872256B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL13736864T PL2872256T3 (en) 2012-07-11 2013-07-05 Solid-bowl screw centrifuge with overflow weir

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012106226.9A DE102012106226A1 (en) 2012-07-11 2012-07-11 Solid bowl centrifuge with overflow weir
PCT/EP2013/064255 WO2014009272A1 (en) 2012-07-11 2013-07-05 Solid-bowl screw centrifuge with overflow weir

Publications (2)

Publication Number Publication Date
EP2872256A1 EP2872256A1 (en) 2015-05-20
EP2872256B1 true EP2872256B1 (en) 2020-01-15

Family

ID=48790418

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13736864.3A Active EP2872256B1 (en) 2012-07-11 2013-07-05 Solid-bowl screw centrifuge with overflow weir

Country Status (8)

Country Link
US (1) US10252277B2 (en)
EP (1) EP2872256B1 (en)
CN (1) CN104470639B (en)
DE (1) DE102012106226A1 (en)
PL (1) PL2872256T3 (en)
RU (1) RU2636706C2 (en)
SG (1) SG11201500183QA (en)
WO (1) WO2014009272A1 (en)

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DE102014104296A1 (en) * 2014-03-27 2015-10-01 Flottweg Se Outlet device of a solid bowl screw centrifuge
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KR102010873B1 (en) * 2019-04-11 2019-08-14 (주)종합해사 Orifice structure of decanter centrifuge

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Also Published As

Publication number Publication date
RU2636706C2 (en) 2017-11-27
RU2015103884A (en) 2016-08-27
PL2872256T3 (en) 2020-06-29
CN104470639A (en) 2015-03-25
SG11201500183QA (en) 2015-04-29
US20150165449A1 (en) 2015-06-18
US10252277B2 (en) 2019-04-09
WO2014009272A1 (en) 2014-01-16
EP2872256A1 (en) 2015-05-20
DE102012106226A1 (en) 2014-01-16
CN104470639B (en) 2017-03-08

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