EP2551019B2 - Solid bowl screw centrifuge with a weir edge - Google Patents

Solid bowl screw centrifuge with a weir edge Download PDF

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Publication number
EP2551019B2
EP2551019B2 EP11006261.9A EP11006261A EP2551019B2 EP 2551019 B2 EP2551019 B2 EP 2551019B2 EP 11006261 A EP11006261 A EP 11006261A EP 2551019 B2 EP2551019 B2 EP 2551019B2
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EP
European Patent Office
Prior art keywords
outlet channel
solid bowl
bowl screw
centrifuge
centrifuge drum
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EP11006261.9A
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German (de)
French (fr)
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EP2551019B1 (en
EP2551019A1 (en
Inventor
Manfred Schlarb
Benno Vielhuber
Wieland Zaglauer
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Flottweg SE
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Flottweg SE
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Application filed by Flottweg SE filed Critical Flottweg SE
Priority to DK11006261.9T priority Critical patent/DK2551019T4/en
Priority to DK13178930.7T priority patent/DK2659985T4/en
Priority to EP13178930.7A priority patent/EP2659985B2/en
Priority to EP11006261.9A priority patent/EP2551019B2/en
Publication of EP2551019A1 publication Critical patent/EP2551019A1/en
Publication of EP2551019B1 publication Critical patent/EP2551019B1/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
    • 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 with a rotatable about a longitudinal axis centrifuge drum having at least one outlet opening for discharging clarified Good from the centrifuge drum via a flowing from the outflow Good and a discharge passage for discharging the entire omitted Good, wherein the weir edge on the The end face of the centrifuge drum is arranged and the outlet channel extends in the flow direction behind the weir edge, the outlet channel is curved to redirect the effluent Good in a substantially tangential direction, and the outlet channel has a bottom surface which is at least partially planar design.
  • a solid bowl screw centrifuge is particularly in post-published WO 2012 089492 A1 described.
  • Out JP 11 197547 A is a solid bowl centrifuge known in which a baffle is provided which deflects the outflowing material from the axial flow direction radially outward.
  • the baffle is radially outward open.
  • Out JP 11 179236 A is a Vollmantelzentrifuge known with wing plates, which are triggered by the outflowing good in flight
  • the invention has for its object to provide a solid bowl screw centrifuge, in which the energy recovery due to a pulse return of the outflowing Guts is provided particularly cost effective and at the same time particularly effective.
  • a solid bowl screw centrifuge with a rotatable about a longitudinal axis centrifuge drum having at least one outlet opening for discharging clarified Good from the centrifuge drum via a flowing from the outflow Good edge and an outlet channel for discharging the entire omitted good
  • said Weir edge is arranged on the front side of the centrifuge drum and the outlet channel extends in particular outside, in the flow direction behind the weir edge, the outlet channel is curved to redirect the effluent Good in a substantially tangential direction
  • the outlet channel has a bottom surface, at least in sections is just designed, wherein the flat portion of the bottom surface is inclined to the tangential direction by an angle of 8 ° to 28 ° radially inwardly.
  • the outlet device is provided for discharging clarified Good from a centrifuge drum on the front side of the centrifuge drum and attached there an associated outlet opening partially overlapping stationary or adjustable.
  • the outlet device comprises a weir with a weir edge and an outlet channel arranged outside the weir for discharging the entire discharged material.
  • the outlet opening is flowed through by the then axially outflowing material which flows out over the weir edge aligned there in the radial direction, that is to say transversely to the longitudinal axis.
  • the weir edge is in particular curved and widely spaced from the longitudinal axis of a first radius.
  • the downstream in the flow direction outlet channel is curved to redirect the outflowing Good in the substantially tangential direction.
  • the outlet channel is designed with a bottom surface over which the material flows. This bottom surface is preferably at least partially spaced from the longitudinal axis, as the first radius is.
  • a weir is provided on the front side, which has its weir edge in the radial plane of the front side, as in conventional weirs.
  • the weir thus arranged leads to a particularly accurate control of the material level within the centrifuge drum.
  • such a weir has only a low tendency to clog and is also very inexpensive in terms of its production. It may be provided in the design of conventional weirs optionally with a particularly wear-resistant designed weir edge. Furthermore, it can be well maintained and replaced.
  • the device according to the invention can therefore also be installed particularly well in replacement of existing systems.
  • the bottom surface is preferably at least partially radially outward, as the weir edge.
  • This type of flow at the weir edge has proven to be particularly advantageous in terms of the controlled removal of the material and also with regard to possible blockage.
  • the outlet channel according to the invention thus achieves two effects: It allows the controlled overflow of the weir edge in a radial direction with only slight turbulence, low imbalance risk and low risk of clogging. At the same time, the outlet channel directs the effluent specifically in the desired direction in order to recover a high level of energy from the effluent.
  • the bottom surface of such outlet channel is at least partially flat or largely flat.
  • Such a bottom surface can be manufactured inexpensively.
  • the material flowing therefrom over a longer distance undergoes a uniform and thus comparatively easy model-technically comprehensible acceleration.
  • the acceleration leads to an increased conversion of the centrifugal force pulse into a tangentially directed motion pulse. It is converted into tangential drive energy as a particularly large proportion of the centrifugal force energy.
  • the flat portion of the bottom surface is inclined to the tangential direction by an angle of 8 ° to 28 °, preferably 18 ° radially inwardly.
  • the bottom of the outlet channel according to the invention is designed so that its plane or substantially flat portion starts against the direction of rotation of the centrifuge drum from the Auslassö Maschinensmitte starting at an angle of 3.5 °.
  • the thus flat or substantially flat section begins at the outlet opening only a predefined piece behind the Auslassö Maschinensmitte.
  • the acceleration of the outgoing material achieved according to the invention thus likewise begins only further back in the outlet channel.
  • the suction obtained with the acceleration thus likewise arises comparatively far back in the outlet channel, as a result of which an overall speed-increasing increase in speed is to be found in the outlet channel. This suction effect reduces the risk of clogging and at the same time increases the kinetic energy in the tangential direction.
  • the flat section of the bottom surface particularly preferably ends counter to the direction of rotation of the centrifuge drum from the outlet opening center considered at an angle of 15 ° to 30 °, preferably 21.5 °.
  • the flat or substantially flat section of this type has a particularly advantageous length, which has proved to be very effective even with different outlet diameters and drum sizes.
  • a curved section in particular an arcuate section of the bottom surface, adjoins the flat section of the bottom surface.
  • a curved section can be produced inexpensively in terms of production and leads to a flow which is not radially changed over a certain angular range and thus also radially not accelerated or decelerated.
  • Such a flow has proven to be particularly advantageous over a certain portion of the circumferential direction.
  • This bottom surface leads to a largely turbulence-free overflow at the weir edge and thus to low imbalance development at the multiple, distributed over the circumference of the centrifuge drum and each overflowed by effluent Weirs.
  • the curved outlet duct according to the invention has, viewed in the longitudinal direction of the centrifuge drum, preferably a first width and a second width in the radial direction, the second width being smaller than the first width.
  • the outlet channel tapers from the outlet openings, that is to say in the flow direction, as far as the end of the outlet channel at which the outflowing material is largely released in the tangential direction. The rejuvenation brings a steady increase in the speed of the flow and thus the kinetic energy of the outflowing material with it.
  • the curved outlet duct is therefore particularly advantageous when viewed in the outlet direction and is designed to be continuously tapered with respect to its width.
  • the acceleration is then largely turbulence-free with simultaneously directed flow through the outlet openings and the subsequent Exhaust ports.
  • the such outlet channel is preferably designed to be open radially inward.
  • the outlet channel is thus in contrast to known solutions of the prior art, in which the outflowing material is discharged through one or more tubes in the tangential direction.
  • the invention according to the invention radially inwardly open channel is not only cheaper to produce, but also has less overall the risk of clogging. Furthermore, such a channel can be easily cleaned during maintenance because it is more accessible.
  • the weir edge and the outlet channel of the solid bowl screw centrifuge according to the invention are preferably designed with a component or in one piece or in one piece, wherein the component is particularly advantageous from the outside on the front side of the centrifuge drum attachable and removable from there.
  • the component is then easily retrofitted depending on the purpose of the centrifuge and can also be easily changed in case of maintenance.
  • the position of the weir cate can be adjusted well. With the adjustment of the weir edge changes in an advantageous manner at the same time the location of the associated outlet channel, without the need for further complicated adjustment or alignment work.
  • Fig. 1 the end face of a centrifuge drum 10 is shown in accordance with the conventional design of a solid bowl centrifuge in its interior receives a (not shown) centrifuge screw.
  • the centrifuge drum 10 is rotatable about a longitudinal axis 12 at high speed in a direction of rotation 14.
  • outlet openings 16 are arranged uniformly spaced over a circle around the longitudinal axis 12.
  • the outlet openings 16 are used for discharging or discharging clarified (not shown) Good from the centrifuge drum 10th
  • each outlet device 18 is attached to the outside of the front side of the centrifuge drum 10.
  • Each outlet device 18 is formed as a one-piece component from a weir plate 20 and an outlet channel 22.
  • the individual weir plate 20 extends in each case in the radial direction, that is transversely to the longitudinal axis 12 and is fixed by means of two screws 24 and thereby slightly fixed in position adjustable on the end face.
  • a weir edge 26 is formed, which is curved and spaced from the longitudinal axis 12 by a radius 28. The outflowing good must overflow this weir edge 26, whereby the crop level in the centrifuge drum 10 is selectively adjustable depending on the desired clarifying power.
  • the associated outlet channel 22 is arranged on the outside of each of the weir plates 20, which has been produced in one piece with the weir plate 20 by means of a milling process.
  • the outlet channel 22 receives the entire over the weir edge 26 flowing Good and thus serves to discharge the entire discharged from the respective outlet opening 16 Good.
  • the outlet channel 22 following in the flow direction of the weir edge 26 has a substantially rectangular cross section and in this case has a bottom surface 30.
  • the bottom surface comprises a curved section 32, which starts at the beginning of the outlet opening 16 along the weir edge 20 (ie in the circumferential direction) counter to the direction of rotation 14 and ends at an angle 34 of 3.5 ° behind the center of the outlet opening 16.
  • the curved portion 32 is designed curved according to the lateral surface of a circular cylinder with the radius 28.
  • a planar section 36 of the bottom surface 30 adjoins the curved section 32.
  • This section 36 extends from the angle 34, starting at an angle 38 of 21.6 °.
  • the flat portion 36 is inclined to the tangential direction by an angle 40 of 18 ° radially inwardly.
  • the planar portion 36 is therefore spaced further from the longitudinal axis 12 than the radius 28 is.
  • the acceleration leads to an increased conversion of the centrifugal force of the outflowing Guts in a tangentially directed motion pulse. Since in particular the entire amount of material flows through the outlet channel 22, a particularly large proportion of the centrifugal force energy of the outflowing material is converted into tangential drive energy for the rotational movement of the centrifuge drum 10.
  • This acceleration effect in the outlet channel 22 is supported by a continuous taper of the outlet channel 22 in the flow direction of the Guts, ie in the tangential direction.
  • This taper is formed in that, starting from a first width 42 for the incoming material, ie viewed in the longitudinal direction, the outlet channel 22 tapers to a second width 44 for the outflowing material, ie in the tangential or radial direction ,
  • the widths 42 and 44 are defined by two side walls 46 and 48 of the outlet channel 22, which are correspondingly curved from the longitudinal direction to the tangential direction.
  • such an outlet channel 22 is designed with a radially inwardly completely open area 50.
  • This area 50 allows a free adjustment of the product level in the outlet channel 22. Since the material can thus flow freely through the outlet channel 22, no blockages can result and the product level at the associated weir edge 26 can be free depending on the product level in the centrifuge drum 10 to adjust.
  • weir plates 20 and the there radially aligned weir edges 26 not least a particularly accurate control of the product level within the centrifuge drum 10 is possible even under highly fluctuating operating conditions.
  • the crop flows After flowing over the radially directed weir edges 26, the crop flows are thus each redirected so that they due to their flow through the outlet channel 22 when leaving the outlet 16 a in the range of 8 ° to 28 °, preferably a 18 ° from the tangential radially to have inside swung motion pulse.
  • the movement impulse thus directed has proved to be particularly advantageous with regard to the energy recycling thus produced in the centrifuge drum 10.

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Description

Hintergrund der ErfindungBackground of the invention

Die Erfindung betrifft eine Vollmantelschneckenzentrifuge mit einer um eine Längsachse drehbaren Zentrifugentrommel, die mindestens eine Auslassöffnung zum Auslassen von geklärtem Gut aus der Zentrifugentrommel über eine von dem ausströmenden Gut zu überströmende Wehrkante und einen Auslasskanal zum Abführen des gesamten ausgelassenen Guts aufweist, wobei die Wehrkante an der Stirnseite der Zentrifugentrommel angeordnet ist und sich der Auslasskanal in Strömungsrichtung hinter der Wehrkante erstreckt, der Auslasskanal gekrümmt gestaltet ist, um das ausströmende Gut in eine im Wesentlichen tangentiale Richtung umzuleiten, und der Auslasskanal eine Bodenfläche aufweist, die zumindest abschnittsweise eben gestaltet ist. Eine solche Vollmantelschneckenzentrifuge ist insbesondere auch in der nachveröffentlichten WO 2012 089492 A1 beschrieben.The invention relates to a solid bowl screw centrifuge with a rotatable about a longitudinal axis centrifuge drum having at least one outlet opening for discharging clarified Good from the centrifuge drum via a flowing from the outflow Good and a discharge passage for discharging the entire omitted Good, wherein the weir edge on the The end face of the centrifuge drum is arranged and the outlet channel extends in the flow direction behind the weir edge, the outlet channel is curved to redirect the effluent Good in a substantially tangential direction, and the outlet channel has a bottom surface which is at least partially planar design. Such a solid bowl screw centrifuge is particularly in post-published WO 2012 089492 A1 described.

Zum Drehen der Zentrifugentrommel einer solchen Vollmantelschneckenzentrifuge ist bekanntlich Antriebsenergie erforderlich, weil beim Einbringen des zu klärenden bzw. zu zentrifugierenden Guts diesem kinetische Energie mitgegeben wird. Umgekehrt wird beim Entleeren die kinetische Energie des geklärten ausströmenden Guts in Reibungsenergie umgewandelt.To rotate the centrifuge drum of such a solid bowl screw centrifuge driving energy is known to be required, because when introducing the to be clarified or to be centrifuged Guts this kinetic energy is given. Conversely, when emptying, the kinetic energy of the clarified effluent is converted into frictional energy.

Es sind Bestrebungen bekannt, die kinetische Energie des ausströmenden Guts möglichst derart zu nutzen, dass dieses ausströmende Gut wieder zum Antrieb der Drehbewegung der Zentrifugentrommel beiträgt. Dazu sind unter anderem an Auslassöffnungen an der Stirnseite der Zentrifugentrommel Auslasskanäle in Form von Rohren bekannt, die den Gutstrom in tangentialer Richtung umleiten. Das sich dann nicht in axialer sondern in tangentialer Richtung austretende Gut führt der Zentrifugentrommel aufgrund seiner Fliehkraftenergie einen Impuls in Drehrichtung zu, der die Zentrifugentrommel in Drehrichtung treibt. Solche Auslasskanäle sind z.B. aus DE 31 12 585 A1 , US 2004/0072668 A1 und US 2004/0072667 A1 bekannt.It is known efforts to use the kinetic energy of the outflowing Guts as possible so that this outflowing Good again contributes to drive the rotational movement of the centrifuge drum. For this purpose, exhaust ducts in the form of pipes are known, inter alia at outlet openings on the front side of the centrifuge drum, which divert the flow of material in the tangential direction. The then not in the axial but in the tangential direction exiting Good leads the centrifuge drum due to its centrifugal force an impulse in the direction of rotation, which drives the centrifuge drum in the direction of rotation. Such outlet channels are eg off DE 31 12 585 A1 . US 2004/0072668 A1 and US 2004/0072667 A1 known.

Aus JP 11 197547 A ist eine Vollmantelzentrifuge bekannt, bei der ein Ablenkblech vorgesehen ist, welches das ausströmende Gut von der axialen Strömungsrichtung nach radial außen ablenkt. Das Ablenkblech ist nach radial außen offen.Out JP 11 197547 A is a solid bowl centrifuge known in which a baffle is provided which deflects the outflowing material from the axial flow direction radially outward. The baffle is radially outward open.

Aus JP 11 179236 A ist eine Vollmantelzentrifuge mit Flügelplatten bekannt, die vom ausströmenden Gut im Flug angestoßen werdenOut JP 11 179236 A is a Vollmantelzentrifuge known with wing plates, which are triggered by the outflowing good in flight

Zugrundeliegende AufgabeUnderlying task

Der Erfindung liegt die Aufgabe zugrunde, eine Vollmantelschneckenzentrifuge zu schaffen, bei der die Energierückgewinnung aufgrund einer Impulsrückführung des ausströmenden Guts besonders kostengünstig und zugleich besonders wirkungsvoll bereitgestellt wird.The invention has for its object to provide a solid bowl screw centrifuge, in which the energy recovery due to a pulse return of the outflowing Guts is provided particularly cost effective and at the same time particularly effective.

Erfindungsgemäße LösungInventive solution

Diese Aufgabe ist erfindungsgemäß mit einer Vollmantelschneckenzentrifuge mit einer um eine Längsachse drehbaren Zentrifugentrommel gelöst, die mindestens eine Auslassöffnung zum Auslassen von geklärtem Gut aus der Zentrifugentrommel über eine von dem ausströmenden Gut zu überströmende Wehrkante und einen Auslasskanal zum Abführen des gesamten ausgelassenen Guts aufweist, wobei die Wehrkante an der Stirnseite der Zentrifugentrommel angeordnet ist und sich der Auslasskanal insbesondere außen, in Strömungsrichtung hinter der Wehrkante erstreckt, der Auslasskanal gekrümmt gestaltet ist, um das ausströmende Gut in eine im Wesentlichen tangentiale Richtung umzuleiten, und der Auslasskanal eine Bodenfläche aufweist, die zumindest abschnittsweise eben gestaltet ist, wobei der ebene Abschnitt der Bodenfläche zur Tangentialrichtung um einen Winkel von 8° bis 28° radial nach innen geneigt ist.This object is inventively achieved with a solid bowl screw centrifuge with a rotatable about a longitudinal axis centrifuge drum having at least one outlet opening for discharging clarified Good from the centrifuge drum via a flowing from the outflow Good edge and an outlet channel for discharging the entire omitted good, said Weir edge is arranged on the front side of the centrifuge drum and the outlet channel extends in particular outside, in the flow direction behind the weir edge, the outlet channel is curved to redirect the effluent Good in a substantially tangential direction, and the outlet channel has a bottom surface, at least in sections is just designed, wherein the flat portion of the bottom surface is inclined to the tangential direction by an angle of 8 ° to 28 ° radially inwardly.

Die erfindungsgemäße Auslassvorrichtung ist zum Auslassen von geklärtem Gut aus einer Zentrifugentrommel an der Stirnseite der Zentrifugentrommel vorgesehen und dort eine zugehörige Auslassöffnung teilweise überdeckend ortsfest oder verstellbar angebracht. Die Auslassvorrichtung umfasst ein Wehr mit einer Wehrkante und einen außen vor dem Wehr angeordneten Auslasskanal zum Abführen des gesamten ausgelassen Guts auf. Die Auslassöffnung wird von dem dann axial ausströmenden Gut durchströmt, welches über die dort in radialer Richtung, also quer zur Längsachse ausgerichtete Wehrkante hinweg ausströmt. Dabei ist die Wehrkante insbesondere gekrümmt gestaltet und von der Längsachse einen ersten Radius weit beabstandet. Der in Strömungsrichtung nachfolgende Auslasskanal ist gekrümmt gestaltet, um das ausströmende Gut in die im Wesentlichen tangentiale Richtung umzuleiten. Der Auslasskanal ist mit einer Bodenfläche gestaltet, über die hinweg das Gut ausströmt. Diese Bodenfläche ist von der Längsachse bevorzugt zumindest abschnittsweise weiter beabstandet, als der erste Radius beträgt.The outlet device according to the invention is provided for discharging clarified Good from a centrifuge drum on the front side of the centrifuge drum and attached there an associated outlet opening partially overlapping stationary or adjustable. The outlet device comprises a weir with a weir edge and an outlet channel arranged outside the weir for discharging the entire discharged material. The outlet opening is flowed through by the then axially outflowing material which flows out over the weir edge aligned there in the radial direction, that is to say transversely to the longitudinal axis. In this case, the weir edge is in particular curved and widely spaced from the longitudinal axis of a first radius. The downstream in the flow direction outlet channel is curved to redirect the outflowing Good in the substantially tangential direction. The outlet channel is designed with a bottom surface over which the material flows. This bottom surface is preferably at least partially spaced from the longitudinal axis, as the first radius is.

Bei der erfindungsgemäßen Vollmantelschneckenzentrifuge ist an der Stirnseite also ein Wehr vorgesehen, welches so wie bei herkömmlichen Wehren seine Wehrkante in der radialen Ebene der Stirnseite hat. Das derart angeordnete Wehr führt zu einer besonders genauen Steuerung des Gutpegels innerhalb der Zentrifugentrommel. Darüber hinaus weist ein solches Wehr nur eine geringe Verstopfungsneigung auf und ist auch im Hinblick auf seine Herstellung sehr kostengünstig. Es kann in der Bauart herkömmlicher Wehre gegebenenfalls mit einer besonders verschleißfest gestalteten Wehrkante versehen sein. Ferner kann es gut gewartet und ausgetauscht werden. Die erfindungsgemäße Vorrichtung kann daher auch besonders gut im Austausch an bestehenden Anlagen verbaut werden. An dem Wehr ist außenseitig der Auslasskanal ausgebildet, dessen Bodenfläche bevorzugt zumindest abschnittsweise radial weiter außen liegt, als die Wehrkante. Damit ergibt sich hinter der erfindungsgemäßen, radial gerichteten Wehrkante wegen der auf das Gut wirkenden Zentrifugalkraft eine zumindest geringfügig radial nach außen gerichtete Strömung, die zu einem Sog an der Wehrkante und einer dort geringfügig erhöhten Strömungsgeschwindigkeit führt. Diese Art der Strömung an der Wehrkante hat sich im Hinblick auf das geregelte Abführen des Guts und auch im Hinblick auf mögliche Verstopfung als besonders vorteilhaft erwiesen.In the case of the solid bowl screw centrifuge according to the invention, therefore, a weir is provided on the front side, which has its weir edge in the radial plane of the front side, as in conventional weirs. The weir thus arranged leads to a particularly accurate control of the material level within the centrifuge drum. In addition, such a weir has only a low tendency to clog and is also very inexpensive in terms of its production. It may be provided in the design of conventional weirs optionally with a particularly wear-resistant designed weir edge. Furthermore, it can be well maintained and replaced. The device according to the invention can therefore also be installed particularly well in replacement of existing systems. On the weir outside the outlet channel is formed, the bottom surface is preferably at least partially radially outward, as the weir edge. This results behind the invention, radially directed weir edge because of the force acting on the good centrifugal force at least slightly radially outward flow, which leads to a suction at the weir edge and there slightly increased flow velocity. This type of flow at the weir edge has proven to be particularly advantageous in terms of the controlled removal of the material and also with regard to possible blockage.

Nach dem Überströmen der Wehrkante wird der Strom des abfließenden Guts mittels des erfindungsgemäßen Auslasskanals so umgeleitet, dass sein grundsätzlich aufgrund der Fliehkraft radial nach außen gerichteter Bewegungsimpuls in eine tangentiale und damit in eine die Zentrifugentrommel antreibende Richtung geschwenkt wird. Der erfindungsgemäße Auslasskanal erreicht damit zwei Wirkungen: Er ermöglicht das geregelte Überströmen der Wehrkante in einer radialen Richtung mit nur geringen Turbulenzen, geringer Unwuchtgefahr und geringer Verstopfungsgefahr. Zugleich leitet der Auslasskanal das abströmende Gut gezielt in die gewünschte Richtung, um damit ein hohes Maß an Energie aus dem abströmenden Gut zurückzugewinnen.After the overflow of the weir edge of the flow of the outflowing Guts is redirected by means of the exhaust duct according to the invention so that its basically due to the centrifugal force directed radially outward movement pulse is pivoted in a tangential and thus in a direction driving the centrifuge drum. The outlet channel according to the invention thus achieves two effects: It allows the controlled overflow of the weir edge in a radial direction with only slight turbulence, low imbalance risk and low risk of clogging. At the same time, the outlet channel directs the effluent specifically in the desired direction in order to recover a high level of energy from the effluent.

Die Bodenfläche des derartigen Auslasskanals ist zumindest abschnittsweise eben bzw. weitgehend eben gestaltet. Eine solche Bodenfläche kann fertigungstechnisch günstig hergestellt werden. Darüber hinaus erfährt das darauf abströmende Gut über eine längere Strecke hinweg eine gleichmäßige und damit vergleichsweise einfach modelltechnisch nachvollziehbare Beschleunigung. Die Beschleunigung führt zu einer vermehrten Umwandlung des Fliehkraftimpulses in einen tangential gerichteten Bewegungsimpuls. Es wird als ein besonders großer Anteil der Fliehkraftenergie in tangentiale Antriebsenergie gewandelt.The bottom surface of such outlet channel is at least partially flat or largely flat. Such a bottom surface can be manufactured inexpensively. In addition, the material flowing therefrom over a longer distance undergoes a uniform and thus comparatively easy model-technically comprehensible acceleration. The acceleration leads to an increased conversion of the centrifugal force pulse into a tangentially directed motion pulse. It is converted into tangential drive energy as a particularly large proportion of the centrifugal force energy.

Der ebene Abschnitt der Bodenfläche ist zur Tangentialrichtung um einen Winkel von 8° bis 28°, vorzugsweise 18° radial nach innen geneigt. Eine solche Ausrichtung des umgelenkten Gutstrahls führt im Vergleich zu einer rein tangentialen Strömung zu einer ganz gezielten Abbremsung des austretenden Stroms und damit zu einer gewissen Stauwirkung. Dieses Stauen bringt eine Erhöhung der potentiellen Energie und damit ein verbesserte nachfolgende Wandlung in tangentiale Bewegungsenergie mit sich.The flat portion of the bottom surface is inclined to the tangential direction by an angle of 8 ° to 28 °, preferably 18 ° radially inwardly. Such an orientation of the deflected Gutstrahls leads in comparison to a purely tangential flow to a very targeted deceleration of the exiting stream and thus to a certain stowage effect. This jamming brings with it an increase of the potential energy and thus an improved subsequent transformation into tangential kinetic energy.

Besonders bevorzugt ist der Boden des erfindungsgemäßen Auslasskanals so gestaltet, dass sein ebener bzw. weitgehend ebener Abschnitt entgegen der Drehrichtung der Zentrifugentrommel von der Auslassöffnungsmitte ausgehend nach einem Winkel von 3,5° beginnt. Der derart ebene bzw. weitgehend ebene Abschnitt beginnt an der Auslassöffnung erst ein vordefiniertes Stück hinter der Auslassöffnungsmitte. Die erfindungsgemäß dort erzielte Beschleunigung des austretenden Guts beginnt also ebenfalls erst weiter hinten im Auslasskanal. Es entsteht der mit der Beschleunigung erzielte Sog also ebenfalls vergleichsweise weit hinten im Auslasskanal, wodurch insgesamt im Auslasskanal ein das Gut heraussaugender Geschwindigkeitszuwachs vorzufinden ist. Mit dieser Sogwirkung wird die Verstopfungsgefahr gesenkt und zugleich die kinetische Energie in tangentialer Richtung erhöht.Particularly preferably, the bottom of the outlet channel according to the invention is designed so that its plane or substantially flat portion starts against the direction of rotation of the centrifuge drum from the Auslassöffnungsmitte starting at an angle of 3.5 °. The thus flat or substantially flat section begins at the outlet opening only a predefined piece behind the Auslassöffnungsmitte. The acceleration of the outgoing material achieved according to the invention thus likewise begins only further back in the outlet channel. Thus, the suction obtained with the acceleration thus likewise arises comparatively far back in the outlet channel, as a result of which an overall speed-increasing increase in speed is to be found in the outlet channel. This suction effect reduces the risk of clogging and at the same time increases the kinetic energy in the tangential direction.

Der ebene Abschnitt der Bodenfläche endet besonders bevorzugt entgegen der Drehrichtung der Zentrifugentrommel von der Auslassöffnungsmitte aus betrachtet nach einem Winkel von 15° bis 30°, vorzugsweise 21,5°. Der derartige ebene bzw. weitgehend ebene Abschnitt weist eine besonders vorteilhafte Länge auf, die sich auch bei verschiedenen Auslassdurchmessern und Trommelgrößen als sehr wirkungsvoll erwiesen hat.The flat section of the bottom surface particularly preferably ends counter to the direction of rotation of the centrifuge drum from the outlet opening center considered at an angle of 15 ° to 30 °, preferably 21.5 °. The flat or substantially flat section of this type has a particularly advantageous length, which has proved to be very effective even with different outlet diameters and drum sizes.

An den ebenen Abschnitt der Bodenfläche schließt sich bei einer weiteren besonders vorteilhaften Ausgestaltung der erfindungsgemäßen Lösung in Drehrichtung der Zentrifugentrommel betrachtet ein gekrümmter Abschnitt, insbesondere ein kreisbogenförmig gekrümmter Abschnitt der Bodenfläche an. Ein solcher gekrümmter Abschnitt kann fertigungstechnisch günstig hergestellt werden und führt zu einer über einen gewissen Winkelbereich radial nicht veränderten, radial also auch nicht beschleunigten oder abgebremsten Strömung. Eine solche Strömung hat sich über einen gewissen Abschnitt der Umfangsrichtung hin als besonders von Vorteil erwiesen. Besonders von Vorteil ist diese gekrümmte, radial konstante Bodenfläche entgegen der Drehrichtung betrachtet jeweils über den ersten Umfangsabschnitt der jeweiligen Auslassöffnung hinweg. Diese Bodenfläche führt zu einem weitgehend turbulenzfreien Überströmen an der Wehrkante und damit zu geringer Unwuchtentwicklung an den mehreren, über den Umfang der Zentrifugentrommel verteilten und jeweils von ausströmendem Gut überströmten Wehren.In the case of a further particularly advantageous embodiment of the solution according to the invention in the direction of rotation of the centrifuge drum, a curved section, in particular an arcuate section of the bottom surface, adjoins the flat section of the bottom surface. Such a curved section can be produced inexpensively in terms of production and leads to a flow which is not radially changed over a certain angular range and thus also radially not accelerated or decelerated. Such a flow has proven to be particularly advantageous over a certain portion of the circumferential direction. Particularly advantageous is this curved, radially constant bottom surface counter to the direction of rotation considered in each case over the first peripheral portion of the respective outlet opening. This bottom surface leads to a largely turbulence-free overflow at the weir edge and thus to low imbalance development at the multiple, distributed over the circumference of the centrifuge drum and each overflowed by effluent Weirs.

Der erfindungsgemäße, gekrümmt gestaltete Auslasskanal hat in Längsrichtung der Zentrifugentrommel betrachtet vorzugsweise eine erste Breite und in radialer Richtung betrachtet eine zweite Breite, wobei die zweite Breite kleiner als die erste Breite gestaltet ist. Der Auslasskanal verjüngt sich von den Auslassöffnungen ausgehend also in Strömungsrichtung bis zu jenem Ende des Auslasskanals, an dem das ausströmende Gut weitgehend in tangentialer Richtung abgegeben wird. Die Verjüngung bringt eine stetige Erhöhung der Geschwindigkeit des Gutstroms und damit der kinetischen Energie des ausströmenden Materials mit sich.The curved outlet duct according to the invention has, viewed in the longitudinal direction of the centrifuge drum, preferably a first width and a second width in the radial direction, the second width being smaller than the first width. The outlet channel tapers from the outlet openings, that is to say in the flow direction, as far as the end of the outlet channel at which the outflowing material is largely released in the tangential direction. The rejuvenation brings a steady increase in the speed of the flow and thus the kinetic energy of the outflowing material with it.

Besonders vorteilhaft ist der gekrümmt gestaltete Auslasskanal daher in Auslassrichtung betrachtet sich hinsichtlich seiner Breite stetig verjüngend gestaltet. Die Beschleunigung erfolgt dann weitgehend turbulenzfrei unter gleichzeitig gezielt geleiteter Durchströmung der Auslassöffnungen und der nachfolgenden Auslasskanäle.The curved outlet duct is therefore particularly advantageous when viewed in the outlet direction and is designed to be continuously tapered with respect to its width. The acceleration is then largely turbulence-free with simultaneously directed flow through the outlet openings and the subsequent Exhaust ports.

Der derartige Auslasskanal ist vorzugsweise radial nach innen offen gestaltet. Der Auslasskanal steht damit im Gegensatz zu bekannten Lösungen des Standes der Technik, bei denen das ausströmende Material durch ein oder mehrere Rohre in tangentialer Richtung abgeleitet wird. Der erfindungsgemäß radial nach innen offene Kanal ist nicht nur kostengünstiger herstellbar, sondern weist insgesamt auch weniger die Gefahr einer Verstopfung auf. Ferner kann ein solcher Kanal bei Wartungsarbeiten leichter gereinigt werden, weil er besser zugänglich ist.The such outlet channel is preferably designed to be open radially inward. The outlet channel is thus in contrast to known solutions of the prior art, in which the outflowing material is discharged through one or more tubes in the tangential direction. The invention according to the invention radially inwardly open channel is not only cheaper to produce, but also has less overall the risk of clogging. Furthermore, such a channel can be easily cleaned during maintenance because it is more accessible.

Die Wehrkante und der Auslasskanal der erfindungsgemäßen Vollmantelschneckenzentrifuge sind vorzugsweise mit einem Bauteil bzw. einteilig oder einstückig gestaltet, wobei das Bauteil insbesondere vorteilhaft von außen an der Stirnseite der Zentrifugentrommel ortsfest anbringbar und von dort abnehmbar ist. Das Bauteil ist dann je nach Einsatzzweck der Zentrifuge leicht umrüstbar und kann auch im Wartungsfall gut gewechselt werden. Ferner kann die Lage der Wehrkate gut eingestellt werden. Mit der Einstellung der Wehrkante ändert sich in vorteilhafter Weise zugleich die Lage des zugehörigen Auslasskanals, ohne dass es dafür weiterer aufwendiger Einstell- oder Ausrichtarbeiten bedarf.The weir edge and the outlet channel of the solid bowl screw centrifuge according to the invention are preferably designed with a component or in one piece or in one piece, wherein the component is particularly advantageous from the outside on the front side of the centrifuge drum attachable and removable from there. The component is then easily retrofitted depending on the purpose of the centrifuge and can also be easily changed in case of maintenance. Furthermore, the position of the weir cate can be adjusted well. With the adjustment of the weir edge changes in an advantageous manner at the same time the location of the associated outlet channel, without the need for further complicated adjustment or alignment work.

Kurzbeschreibung der ZeichnungenBrief description of the drawings

Nachfolgend wird ein Ausführungsbeispiel der erfindungsgemäßen Lösung anhand der beigefügten schematischen Zeichnungen näher erläutert. Es zeigt:

Fig. 1
eine Ansicht der Stirnseite einer Zentrifugentrommel einer erfindungsgemäßen Vollmantelschneckenzentrifuge mit einer daran angeordneten Auslassvorrichtung zum Auslassen von Gut aus der Zentrifugentrommel,
Fig. 2
die Auslassvorrichtung gemäß Fig. 1 in vergrößerter Ansicht,
Fig. 3
die Seitenansicht der Auslassvorrichtung gemäß Fig. 2 und
Fig. 4
die Draufsicht der Auslassvorrichtung gemäß Fig. 2.
An exemplary embodiment of the solution according to the invention will be explained in more detail below with reference to the attached schematic drawings. It shows:
Fig. 1
a view of the end face of a centrifuge drum of a solid bowl screw centrifuge according to the invention with an outlet device arranged thereon for discharging good from the centrifuge drum,
Fig. 2
the outlet device according to Fig. 1 in an enlarged view,
Fig. 3
the side view of the outlet according to Fig. 2 and
Fig. 4
the top view of the outlet according to Fig. 2 ,

Detaillierte Beschreibung des AusführungsbeispielsDetailed description of the embodiment

In Fig. 1 ist die Stirnseite einer Zentrifugentrommel 10 gezeigt, die gemäß der herkömmlichen Bauart einer Vollmantelschneckenzentrifuge in ihrem Inneren eine (nicht dargestellte) Zentrifugenschnecke aufnimmt. Die Zentrifugentrommel 10 ist um eine Längsachse 12 mit hoher Drehzahl in eine Drehrichtung 14 drehbar.In Fig. 1 the end face of a centrifuge drum 10 is shown in accordance with the conventional design of a solid bowl centrifuge in its interior receives a (not shown) centrifuge screw. The centrifuge drum 10 is rotatable about a longitudinal axis 12 at high speed in a direction of rotation 14.

An der Stirnseite der Zentrifugentrommel 10 sind sechs jeweils kreisrunde Auslassöffnungen 16 über einen Kreis um die Längsachse 12 herum gleichmäßig beabstandet angeordnet. Die Auslassöffnungen 16 dienen zum Abführen bzw. Auslassen von geklärtem (nicht dargestelltem) Gut aus der Zentrifugentrommel 10.At the end face of the centrifuge drum 10, six respective circular outlet openings 16 are arranged uniformly spaced over a circle around the longitudinal axis 12. The outlet openings 16 are used for discharging or discharging clarified (not shown) Good from the centrifuge drum 10th

Vor jeder der Auslassöffnungen 16 ist außenseitig an der Stirnseite der Zentrifugentrommel 10 eine Auslassvorrichtung 18 angebracht. Jede Auslassvorrichtung 18 ist als einstückiges Bauteil aus einer Wehrplatte 20 und einem Auslasskanal 22 gebildet. Die einzelne Wehrplatte 20 erstreckt sich jeweils in radialer Richtung, also quer zur Längsachse 12 und ist mittels zweier Schrauben 24 ortsfest und dabei geringfügig in ihrer Lage verstellbar an der Stirnseite befestigt. An jeder Wehrplatte 20 ist ein Wehrkante 26 ausgebildet, die gekrümmt gestaltet und dabei von der Längsachse 12 um einen Radius 28 beabstandet ist. Das ausströmende Gut muss diese Wehrkante 26 überströmen, wodurch der Gutpegel in der Zentrifugentrommel 10 je nach gewünschter Klärleistung gezielt einstellbar ist.Before each of the outlet openings 16, an outlet device 18 is attached to the outside of the front side of the centrifuge drum 10. Each outlet device 18 is formed as a one-piece component from a weir plate 20 and an outlet channel 22. The individual weir plate 20 extends in each case in the radial direction, that is transversely to the longitudinal axis 12 and is fixed by means of two screws 24 and thereby slightly fixed in position adjustable on the end face. At each weir plate 20, a weir edge 26 is formed, which is curved and spaced from the longitudinal axis 12 by a radius 28. The outflowing good must overflow this weir edge 26, whereby the crop level in the centrifuge drum 10 is selectively adjustable depending on the desired clarifying power.

In Längsrichtung bzw. in Strömungsrichtung über die Wehrkante 26 hinweg ist außen an jeder der Wehrplatten 20 der zugehörige Auslasskanal 22 angeordnet, der mittels eines Fräsvorgangs einstückig mit der Wehrplatte 20 hergestellt worden ist.In the longitudinal direction or in the flow direction over the weir edge 26, the associated outlet channel 22 is arranged on the outside of each of the weir plates 20, which has been produced in one piece with the weir plate 20 by means of a milling process.

Der Auslasskanal 22 nimmt das gesamte über die Wehrkante 26 strömende Gut auf und dient damit zum Abführen des gesamten aus der jeweiligen Auslassöffnung 16 ausgelassenen Guts.The outlet channel 22 receives the entire over the weir edge 26 flowing Good and thus serves to discharge the entire discharged from the respective outlet opening 16 Good.

Der in Strömungsrichtung der Wehrkante 26 nachfolgende Auslasskanal 22 ist im Querschnitt im Wesentlichen rechteckig gestaltet und weist dabei eine Bodenfläche 30 auf. Die Bodenfläche umfasst einen gekrümmten Abschnitt 32, der entlang der Wehrkante 20 (also in Umfangsrichtung) entgegen der Drehrichtung 14 betrachtet am Anfang der Auslassöffnung 16 beginnt und nach einem Winkel 34 von 3,5° hinter der Mitte der Auslassöffnung 16 endet. Der gekrümmte Abschnitt 32 ist gemäß der Mantelfläche eines Kreiszylinders mit dem Radius 28 gekrümmt gestaltet.The outlet channel 22 following in the flow direction of the weir edge 26 has a substantially rectangular cross section and in this case has a bottom surface 30. The bottom surface comprises a curved section 32, which starts at the beginning of the outlet opening 16 along the weir edge 20 (ie in the circumferential direction) counter to the direction of rotation 14 and ends at an angle 34 of 3.5 ° behind the center of the outlet opening 16. The curved portion 32 is designed curved according to the lateral surface of a circular cylinder with the radius 28.

An den gekrümmten Abschnitt 32 schließt sich entgegen der Drehrichtung 14 betrachtet ein ebener Abschnitt 36 der Bodenfläche 30 an. Dieser Abschnitt 36 erstreckt sich vom Winkel 34 ausgehend bis zu einem Winkel 38 von 21,6°. Der ebene Abschnitt 36 ist dabei zur Tangentialrichtung um einen Winkel 40 von 18° radial nach innen geneigt. Der ebene Abschnitt 36 ist von der Längsachse 12 daher weiter beabstandet, als wie der Radius 28 beträgt. An dem ebenen Abschnitt 36 erfährt das darauf abströmende Gut über eine längere Strecke hinweg eine gleichmäßige und damit vergleichsweise einfach modelltechnisch nachvollziehbare Beschleunigung. Die Beschleunigung führt zu einer vermehrten Umwandlung des Fliehkraftimpulses des abströmenden Guts in einen tangential gerichteten Bewegungsimpuls. Da dabei insbesondere auch die gesamte Menge an Gut durch den Auslasskanal 22 strömt, wird ein besonders großer Anteil der Fliehkraftenergie des ausströmenden Guts in tangentiale Antriebsenergie für die Drehbewegung der Zentrifugentrommel 10 gewandelt.When viewed against the direction of rotation 14, a planar section 36 of the bottom surface 30 adjoins the curved section 32. This section 36 extends from the angle 34, starting at an angle 38 of 21.6 °. The flat portion 36 is inclined to the tangential direction by an angle 40 of 18 ° radially inwardly. The planar portion 36 is therefore spaced further from the longitudinal axis 12 than the radius 28 is. At the flat portion 36, the material flowing therefrom, over a longer distance, experiences a uniform and thus comparatively simple model-technically comprehensible acceleration. The acceleration leads to an increased conversion of the centrifugal force of the outflowing Guts in a tangentially directed motion pulse. Since in particular the entire amount of material flows through the outlet channel 22, a particularly large proportion of the centrifugal force energy of the outflowing material is converted into tangential drive energy for the rotational movement of the centrifuge drum 10.

Dieser Beschleunigungseffekt im Auslasskanal 22 wird durch eine stetige Verjüngung des Auslasskanals 22 in Strömungsrichtung des Guts, also in tangentialer Richtung unterstützt. Diese Verjüngung ist dadurch gebildet, dass sich der Auslasskanal 22 ausgehend von einer ersten Breite 42 für das einströmende Gut, also in Längsrichtung betrachtet, ausgehend, sich zu einer zweiten Breite 44 für das ausströmende Gut, also in tangentialer bzw. radialer Richtung betrachtet, verjüngt. Die Breiten 42 und 44 werden dabei von zwei Seitenwänden 46 und 48 des Auslasskanals 22 definiert, welche entsprechend von der Längsrichtung ausgehend zur tangentialen Richtung gekrümmt sind.This acceleration effect in the outlet channel 22 is supported by a continuous taper of the outlet channel 22 in the flow direction of the Guts, ie in the tangential direction. This taper is formed in that, starting from a first width 42 for the incoming material, ie viewed in the longitudinal direction, the outlet channel 22 tapers to a second width 44 for the outflowing material, ie in the tangential or radial direction , The widths 42 and 44 are defined by two side walls 46 and 48 of the outlet channel 22, which are correspondingly curved from the longitudinal direction to the tangential direction.

Zugleich ist der derartige Auslasskanal 22 mit einem radial nach innen vollständig offenen Bereich 50 gestaltet. Dieser Bereich 50 ermöglicht ein freies Einstellen des Gutpegels im Auslasskanal 22. Da das Gut also frei durch den Auslasskanal 22 abströmen kann, können sich keine Verstopfungen ergeben und es kann sich der Gutpegel an der zugehörigen Wehrkante 26 frei in Abhängigkeit des Gutpegels in der Zentrifugentrommel 10 einstellen.At the same time, such an outlet channel 22 is designed with a radially inwardly completely open area 50. This area 50 allows a free adjustment of the product level in the outlet channel 22. Since the material can thus flow freely through the outlet channel 22, no blockages can result and the product level at the associated weir edge 26 can be free depending on the product level in the centrifuge drum 10 to adjust.

Mit den Wehrplatten 20 und den dort radial ausgerichteten Wehrkanten 26 ist nicht zuletzt dadurch eine besonders genaue Steuerung des Gutpegels innerhalb der Zentrifugentrommel 10 auch bei stark schwankenden Betriebsbedingungen möglich.With the weir plates 20 and the there radially aligned weir edges 26 not least a particularly accurate control of the product level within the centrifuge drum 10 is possible even under highly fluctuating operating conditions.

Nach dem Überströmen der radial gerichteten Wehrkanten 26 werden die Gutströme also jeweils so umgeleitet, dass sie aufgrund ihrer Strömung durch den Auslasskanal 22 beim Verlassen der Auslassvorrichtung 16 einen im Bereich von 8° bis 28°, vorzugsweise einen um 18° aus der Tangentialrichtung radial nach innen geschwenkten Bewegungsimpuls aufweisen. Der derart gerichtete Bewegungsimpuls hat sich im Hinblick auf die damit erzeugte Energierückführung in die Zentrifugentrommel 10 als besonders vorteilhaft erwiesen.After flowing over the radially directed weir edges 26, the crop flows are thus each redirected so that they due to their flow through the outlet channel 22 when leaving the outlet 16 a in the range of 8 ° to 28 °, preferably a 18 ° from the tangential radially to have inside swung motion pulse. The movement impulse thus directed has proved to be particularly advantageous with regard to the energy recycling thus produced in the centrifuge drum 10.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

1010
Zentrifugentrommelcentrifuge drum
1212
Längsachselongitudinal axis
1414
Drehrichtungdirection of rotation
1616
Auslassöffnungenoutlet
1818
Auslassvorrichtung als einstückiges BauteilOutlet device as a one-piece component
2020
Wehrplatteweir plate
2222
Auslasskanalexhaust port
2424
Schraubescrew
2626
Wehrkanteweir edge
2828
Radiusradius
3030
Bodenflächefloor area
3232
gekrümmter Abschnitt der Bodenflächecurved section of the floor surface
3434
Winkel (3,5°)Angle (3.5 °)
3636
ebener Abschnitt der Bodenflächelevel section of the floor surface
3838
Winkel (21,6°)Angle (21.6 °)
4040
Winkel (18,0°)Angle (18,0 °)
4242
erste Breite (in Längsrichtung betrachtet)first width (viewed longitudinally)
4444
zweite Breite (in radialer Richtung betrachtet)second width (viewed in the radial direction)
4646
SeitenwandSide wall
4848
SeitenwandSide wall
5050
radial nach innen offener Bereichradially inward open area

Claims (9)

  1. Solid bowl screw centrifuge having a centrifuge drum (10) rotatable about a longitudinal axis, which comprises at least one outlet opening (16) for discharging clarified material from the centrifuge drum (10) via a weir edge (26) to be overflown by the outflowing material and an outlet channel (22) for carrying off the entire discharged material, the weir edge (26) being arranged at the front side of the centrifuge drum (10) and the outlet channel (22) extending in the flow direction downstream of the weir edge (26), the outlet channel (22) being of curved design in order to divert the outflowing material in a substantially tangential direction, and the outlet channel (22) having a bottom surface (30) which at least partially is of flat design,
    characterised in that
    the flat portion (36) of the bottom surface (30) is inclined radially inwards by an angle of 8° to 28° to the tangential direction.
  2. Solid bowl screw centrifuge according to Claim 1, wherein the flat portion (36) of the bottom surface (30) is inclined radially inwards by an angle of 18° to the tangential direction.
  3. Solid bowl screw centrifuge according to Claim 1 or 2, wherein the flat portion (36) of the bottom surface (30) begins after an angle of 3.5° from the centre of the outlet opening, viewed opposite the direction of rotation (14) of the centrifuge drum (10).
  4. Solid bowl screw centrifuge according to one of Claims 1 to 3, wherein the flat portion (36) of the bottom surface (30) ends after an angle of 15° to 30°, preferably 21.5°, from the centre of the outlet opening, viewed opposite the direction of rotation (14) of the centrifuge drum (10).
  5. Solid bowl screw centrifuge according to Claim 4, wherein a curved portion (32), in particular a circular-arc-shaped curved portion, of the bottom surface (30) adjoins the flat portion (36) of the bottom surface (30), viewed in the direction of rotation (14) of the centrifuge drum (10).
  6. Solid bowl screw centrifuge according to one of Claims 1 to 5, wherein the outlet channel (22) of curved design has a first width (42) for the inflowing material, viewed in the longitudinal direction of the centrifuge drum (10), and a second width (44) for the outflowing material, viewed in the radial direction, and the second width (44) is designed smaller than the first width (42).
  7. Solid bowl screw centrifuge according to Claim 6, wherein the outlet channel (22) of curved design is of continuously diminishing design with respect to it is width, viewed in the discharge direction.
  8. Solid bowl screw centrifuge according to one of Claims 1 to 7, wherein the outlet channel (22) is designed radially inwardly open.
  9. Solid bowl screw centrifuge according to one of Claims 1 to 8, wherein the weir edge (26) and the outlet channel (22) are designed with a component (18) which, in particular from the outside, is fixedly attachable to the front side of the centrifuge drum (10) and detachable therefrom.
EP11006261.9A 2011-07-29 2011-07-29 Solid bowl screw centrifuge with a weir edge Active EP2551019B2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
DK11006261.9T DK2551019T4 (en) 2011-07-29 2011-07-29 Full casing worm centrifuge with an overflow edge
DK13178930.7T DK2659985T4 (en) 2011-07-29 2011-07-29 Full casing worm centrifuge with overflow edge
EP13178930.7A EP2659985B2 (en) 2011-07-29 2011-07-29 Solid bowl worm centrifuge with a weir edge
EP11006261.9A EP2551019B2 (en) 2011-07-29 2011-07-29 Solid bowl screw centrifuge with a weir edge

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP11006261.9A EP2551019B2 (en) 2011-07-29 2011-07-29 Solid bowl screw centrifuge with a weir edge

Related Child Applications (2)

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EP13178930.7A Division-Into EP2659985B2 (en) 2011-07-29 2011-07-29 Solid bowl worm centrifuge with a weir edge
EP13178930.7A Division EP2659985B2 (en) 2011-07-29 2011-07-29 Solid bowl worm centrifuge with a weir edge

Publications (3)

Publication Number Publication Date
EP2551019A1 EP2551019A1 (en) 2013-01-30
EP2551019B1 EP2551019B1 (en) 2016-09-14
EP2551019B2 true EP2551019B2 (en) 2019-11-06

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EP13178930.7A Active EP2659985B2 (en) 2011-07-29 2011-07-29 Solid bowl worm centrifuge with a weir edge
EP11006261.9A Active EP2551019B2 (en) 2011-07-29 2011-07-29 Solid bowl screw centrifuge with a weir edge

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EP13178930.7A Active EP2659985B2 (en) 2011-07-29 2011-07-29 Solid bowl worm centrifuge with a weir edge

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DK (2) DK2551019T4 (en)

Families Citing this family (3)

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Publication number Priority date Publication date Assignee Title
MX2011001714A (en) 2008-08-15 2011-03-30 Mi Llc Centrifuge.
DK2789395T4 (en) 2013-04-08 2020-02-10 Flottweg Se Decanter centrifuge with an energy recovery unit
DE102014108722A1 (en) 2014-04-30 2015-11-05 Hiller Gmbh screw centrifuge

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Publication number Priority date Publication date Assignee Title
WO2008138345A1 (en) † 2007-05-09 2008-11-20 Alfa Laval Corporate Ab A centrifugal separator and a liquid phase discharge port member
WO2010076750A1 (en) † 2008-12-30 2010-07-08 Alfa Laval Corporate Ab A decanter centrifuge with a slide valve body
DE102010061563A1 (en) † 2010-12-27 2012-06-28 Gea Mechanical Equipment Gmbh Solid bowl centrifuge with overflow weir

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DE3112585A1 (en) 1981-03-30 1982-10-14 Buckau-Walther AG, 4048 Grevenbroich Method and device for separating a mixture of two materials
JP3543597B2 (en) 1997-12-22 2004-07-14 株式会社クボタ Separation water discharge device in horizontal centrifuge
JPH11197547A (en) * 1998-01-13 1999-07-27 Kubota Corp Device of discharging separated water in a horizontal type centrifugal separator
US20040072668A1 (en) 2002-10-15 2004-04-15 Baker Hughes Incorporated Liquid phase discharge port incorporating chamber nozzle device for centrifuge
US7022061B2 (en) 2002-10-15 2006-04-04 Andritz Ag Centrifuge discharge port with power recovery

Patent Citations (3)

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Publication number Priority date Publication date Assignee Title
WO2008138345A1 (en) † 2007-05-09 2008-11-20 Alfa Laval Corporate Ab A centrifugal separator and a liquid phase discharge port member
WO2010076750A1 (en) † 2008-12-30 2010-07-08 Alfa Laval Corporate Ab A decanter centrifuge with a slide valve body
DE102010061563A1 (en) † 2010-12-27 2012-06-28 Gea Mechanical Equipment Gmbh Solid bowl centrifuge with overflow weir

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Publication number Publication date
DK2551019T4 (en) 2020-02-03
EP2551019B1 (en) 2016-09-14
DK2551019T3 (en) 2016-12-12
EP2659985B1 (en) 2016-09-14
EP2551019A1 (en) 2013-01-30
DK2659985T4 (en) 2020-02-03
EP2659985B2 (en) 2019-11-06
EP2659985A1 (en) 2013-11-06
DK2659985T3 (en) 2016-12-19

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