EP2658656B1 - Solid bowl screw centrifuge having an overflow weir - Google Patents
Solid bowl screw centrifuge having an overflow weir Download PDFInfo
- Publication number
- EP2658656B1 EP2658656B1 EP11794487.6A EP11794487A EP2658656B1 EP 2658656 B1 EP2658656 B1 EP 2658656B1 EP 11794487 A EP11794487 A EP 11794487A EP 2658656 B1 EP2658656 B1 EP 2658656B1
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- EP
- European Patent Office
- Prior art keywords
- solid
- drum
- screw centrifuge
- bowl screw
- rotation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000007787 solid Substances 0.000 title description 22
- 239000007788 liquid Substances 0.000 claims description 33
- 239000000463 material Substances 0.000 claims description 14
- 230000007704 transition Effects 0.000 claims 1
- 238000007599 discharging Methods 0.000 description 4
- 238000011109 contamination Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000007791 liquid phase Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005352 clarification Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
- B04B1/20—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
- B04B1/20—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl
- B04B2001/2075—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl with means for recovering the energy of the outflowing liquid
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
- B04B—CENTRIFUGES
- B04B1/00—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles
- B04B1/20—Centrifuges with rotary bowls provided with solid jackets for separating predominantly liquid mixtures with or without solid particles discharging solid particles from the bowl by a conveying screw coaxial with the bowl axis and rotating relatively to the bowl
- B04B2001/2083—Configuration of liquid outlets
Definitions
- the invention relates to a solid bowl screw centrifuge according to the preamble of claim 1.
- Solid bowl centrifuges are known in various embodiments.
- Nozzles on solid bowl centrifuges and their effect of energy saving with a corresponding orientation inclined to the drum axis are further from the DE 39 04 151 A1 known.
- baffles can be assigned, which give the liquid emerging from the drum a spin, the recoil effect occurring is to be used to save energy.
- the baffles are attached to the outside of the overflow weir, for example to the weir plates. They are for example formed as flat sheets, which are aligned parallel to the drum rotation axis, wherein the plane in which lie the flat sheets, the drum axis does not intersect and approximately at an angle of about 45 ° with the radially extending straight line, which in each case by the drum rotation axis and the respective passage opening extends.
- the object of the invention is to provide a solid shell screw centrifuge optimized with regard to energy saving, which can also be regarded as advantageous from a hygienic point of view.
- Liquids with fibrous solids may, in a complicated designed passage opening to the problem that the fibers get stuck on exit from the housing in certain areas, so provided for receiving the weir plate grooves. This can happen especially during shutdowns, when the liquid ring collapses suddenly due to small centrifugal forces but constant gravitational force and the drum empties spontaneously.
- housings as a device for the discharge of liquid as have been variously proposed in the prior art, product deposits can easily form, since a near-surface layer flow is formed, which can not rinse the central regions of the housing of solids. Due to the open design of the drainage channels, the o.g. Disadvantages avoided.
- the variants of the invention with the open drainage channel is also advantageous in that the present invention leaves the overflow weir directly to the weir plates on the drum cover and only the liquid, which has already left the rotating system on the overflow weir, is deflected in the circumferential direction. After emerging from the drum, no clearing effect can occur any more, but the entire outgoing liquid jet is deflected by the deflector in the circumferential direction.
- the chosen constructions also avoid that the liquid contained in the housing exert too high unwanted additional centrifugal forces on the drum.
- the outlet or discharge channels can not fill with liquid, it forms only a relatively thin layer of liquid that exerts relatively little additional forces.
- the inclined passage openings in the end-face drum wall combined with a weir plate without outlet element or with a weir plate which has a "grooved" contour and in particular the embedded in the drum wall insert have the advantage that the required space in the axial direction for the rotor relative is small. This makes it possible to minimize the use of material for the rotor, the frame carrying the rotor and the housing surrounding the rotor. In addition, the storage distance is shortened, which can be due to the improved machine dynamics properties achieve higher speeds of the centrifuge, as the speed-limiting natural frequencies shift to higher values.
- the design with an insert embedded in the drum wall offers the advantage that adjustments of the inner contour to product properties and also to operating parameters, such as, for example, the throughput capacity are possible without changing the drum wall.
- the inserts can also be easily exchanged.
- the figures below is partially associated with a schematic representation of a coordinate system in the center of which the axis of rotation D of a centrifuge drum is located and in which the arrow U indicates the direction of rotation of a centrifuge drum.
- Fig. 1 should first clarify the basic structure of a solid bowl centrifuge. The drive together with control, a hood and other for the expert obvious elements are not shown here.
- Fig. 1 shows a solid bowl screw centrifuge 1 with a preferably horizontal axis of rotation D rotatable drum 3, in which a likewise rotatable screw 5 is arranged.
- the drum 3 and the screw 5 each have a substantially cylindrical portion and a conically tapered portion here.
- An axially extending centric inlet pipe 7 serves to supply the centrifuged material via a distributor 9 into the centrifugal space 11 between the screw 5 and the drum 3.
- the screw 5 rotates at a slightly lower or greater speed than the drum 3 and conveys the ejected solid to the conical portion out of the drum 3 to the solids discharge 13th
- each passage opening 15 flows to the larger drum diameter at the rear end of the cylindrical portion of the drum 3 and is discharged through a weir having passage openings 15 in a drum cover 17, each passage opening 15 is associated with a weir plate 19, which here radially adjustable on the outside the drum lid is attached.
- the inner radial edge of the weir plate thus defines an overflow edge and thus also the actual weir or overflow weir 21.
- the passage opening 15 and the weir plate 19 with the overflow weir 21 form in Fig. 1 each in their interaction a "means 23 for the discharge of liquid from the centrifuge drum" from. It is preferably provided to provide not only one of these devices 23 on the drum cover, but to distribute at least one radius in each case several of these devices in the circumferential direction.
- a radial adjustability of the weir plates 19 can also be achieved, for example, simply via hole patterns 37 (see FIG Fig. 5 ) with selectable radial holes or bores on the weir plate and corresponding bores on the drum cover and bolts or the like. Realized to thereby allow easy adjustment of the liquid level diameter in the drum.
- the hole patterns are for simplicity only in Fig. 5 illustrated, but preferably provided in all versions.
- the drum cover and / or the at least one device 23 for the discharge of liquid from the centrifuge drum by a corresponding device 23 'of Fig. 2 to 14 be replaced.
- the 3 and 4 show plan views of two different devices 23 'and Fig. 2 shows a section through a corresponding device 23 '.
- modified devices 23 'for discharging liquid from a centrifuge drum which in turn comprise one or more passage openings (s) 15 in a drum cover 17 at a certain radius outside the axis of rotation D and in each case one the associated passage opening 15 completely or partially covering weir plate 19.
- the devices 23 'further each have a discharge channel 25, which is formed on the respective weir plate 19 and / or formed integrally therewith.
- the weir plate 19 of Fig. 2 to 4 is preferably directly outside the drum cover 17 aligned parallel to the drum cover 17 at.
- the weir 21 is placed in this area on a further outward at the bottom of the recess radius R27.
- the material recess 27 on the outside of the weir plate 19 preferably merges into the discharge channel 25 in alignment. It thus forms the beginning of the discharge channel 25 itself.
- the discharge channel 25 can (see Fig. 5 ) consist only of the material recess 27 when the weir plate 19 is sufficiently thick and the material recess accordingly in an inclination angle ⁇ (see Fig. 6 ) is aligned with the direction of rotation U.
- the material recess is lengthened by a groove element 29 extending the weir plate on its side facing away from the drum 1.
- the discharge channel 25 is designed to be open at least on its radially inward-pointing side and preferably also on its end remote from the weir plate 19.
- the discharge channel has lateral deflection walls 31a, 31b, which may be flat or curved.
- the cross section of the discharge channel 25 - see, for example Fig. 2 - can be designed in different ways. It is essential that the discharge channel 25 is radially open inwards towards the axis of rotation D, preferably completely (in particular in the direction of flow of the exiting liquid). Especially the completely inwardly open design is insensitive to contamination, the Contamination tendency can be further reduced by rounding off corner areas of the discharge channel 25.
- the cross section of the discharge channel 25 can be correspondingly angular ( Fig. 3 ) or rather rounded ( Fig. 4 ).
- the cross-section can be constant over the length of the discharge channel or change.
- the drainage channel 25 is formed on structurally particularly simple and cost-effective and again insensitive to contamination only in that the weir plates 19 each have no elongated channel member 29 but that only the material recess 27 is provided on the weir plate whose side walls 31a, 31b in the circumferential direction not are axially aligned but opposite to the direction of rotation obliquely or bent, so as to deflect the exiting flow against the rotational direction.
- the weir plates 19 of FIGS. 5 and 6 Due to their configuration, for the sake of simplicity, they are also referred to below as "grooved" weir plates 19.
- the overflow weir 21 of the embodiments according to the Fig. 2 to 6 is located at the inlet of the liquid in the material recess 27 of the weir plate 19, which thus determines the diameter of the liquid level in the drum.
- the angle ⁇ is less than 0 °, for example, less than -30 ° (not shown), even if this occurs an exit of the liquid phase in the direction of the drum cover itself.
- FIGS. 7 and 8 show further embodiments of outlet elements, which have a radially inwardly open discharge channel 25.
- the gutter element 29 of the discharge channel has a shape running concentrically on a circular arc section with a constant radius. Therefore, in particular, the bottom wall 35, in whole or in sections, has a rounded shape, in particular concentric with the center of rotation.
- Fig. 2 to 8 Embodiments relate to which in any case wholly open drainage channels 25 in a weir plate 19 and preferably in an axial groove-like extension - channel element 29 - the weir plate 19 are formed, it is also conceivable to redirect the liquid flowing out of the drum 1 in the circumferential direction in that the drum cover itself has passage openings 15 which do not extend in the axial direction, but which are inclined relative to the longitudinal axis D of the drum by an angle ⁇ .
- the passage openings 15 are thus, for example, although cylindrical in itself, but oriented obliquely to the axis of rotation, wherein the angle ⁇ between the axis of rotation D and the central axis of the passage openings 15 in any case in sections greater than 0 ° and smaller than 90 °.
- the passage opening can also be curved in itself. Mixed forms of the described embodiments are readily feasible.
- Each of the "inclined" passage openings 15 is preferably covered by a corresponding weir plate 19 up to a predetermined radius.
- this covering weir plate 19 each have a "straight" overflow edge or weir edge 21, which is on a predetermined, preferably by means of hole patterns or the like. Adjustable radius.
- the "inclined" passage openings with weir plates 19 in the manner of Fig. 2 to 8 to combine, ie with weir plates having a kind of discharge channel 25, at least in the form of a groove contour, in order to achieve such a particularly advantageous discharge behavior.
- FIGS. 11 and 12 Versions with inclined passage openings 15 in the front-side drum wall 17 and weir plates 19, a "grooved" beveled contour of the type Fig. 6 or 7 exhibit.
- Fig. 13 further shows an embodiment, which advantageously the inclined passage openings 15 in the end-side drum wall 17 in each case with one of the weir plates 19 with a channel element 29 in the manner of Fig. 2 or 3 combined.
- the Fig. 14 also illustrates the ability to insert into the openings 15 of the drum cover inserts 41, for example, threaded inserts which are screwed into screw holes of the drum cover 17, these inserts can be used even in axial bores of the drum cover and then in turn may have holes 43 which are inclined are aligned to the drum axis D and D '.
- the inserts 41 in the drum wall or in the drum cover can be configured in various ways.
- the axial extent of the insert 41 of the axial thickness of the drum wall and the axial thickness of the drum cover correspond ( Fig. 14 ).
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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
Vollmantel-Schneckenzentrifugen sind in verschiedensten Ausführungsformen bekannt.Solid bowl centrifuges are known in various embodiments.
So offenbart die
Düsen an Vollmantelschneckenzentrifugen und ihr Effekt der Energieeinsparung bei entsprechender Ausrichtung geneigt zur Trommelachse sind ferner aus der
Die Veröffentlichung "
Es ist auch bekannt - so aus der
Zum technologischen Hintergrund werden in Hinsicht auf Anspruch 1 noch die
Die Erfindung hat ausgehend von diesem Stand der Technik die Aufgabe, eine hinsichtlich der Energieeinsparung optimierte Vollmantel-Schneckenzentrifuge zu schaffen, welche auch aus hygienischer Sicht als vorteilhaft betrachtet werden kann.Starting from this prior art, the object of the invention is to provide a solid shell screw centrifuge optimized with regard to energy saving, which can also be regarded as advantageous from a hygienic point of view.
Die Erfindung löst diese Aufgabe durch die Gegenstände der Ansprüche 1 und 13.The invention solves this problem by the subject matter of
Nachfolgend seien einige besondere Vorteile der beanspruchten und beschriebenen Ausgestaltungen zusammen gestellt.Below are some special advantages of the claimed and described embodiments together.
Zunächst sei ein Hauptvorteil der verschiedenen Ausgestaltungen mit Ableitungsrinnen erläutert. Flüssigkeiten mit faserigen Feststoffanteilen können bei einer kompliziert gestalteten Durchlassöffnung zu dem Problem führen, dass sich die Fasern beim Austritt aus dem Gehäuse in bestimmten Bereichen, so in für die Aufnahme des Wehrblechs vorgesehenen Nuten hängen bleiben. Dies kann insbesondere bei Abfahrvorgängen passieren, wenn der Flüssigkeitsring plötzlich aufgrund zu kleiner Zentrifugalkräfte aber gleichbleibender Gravitationskraft zusammenbricht und die Trommel sich spontan entleert. Gerade in Gehäusen als Einrichtung zum Ableiten von Flüssigkeit, wie sie im Stand der Technik verschiedentlich vorgeschlagen worden sind, können sich leicht Produktablagerungen bilden, da sich eine oberflächennahe Schichtströmung ausbildet, welche die zentrumsfernen Bereiche des Gehäuses nicht von Feststoffen freispülen kann. Durch die offene Gestaltung der Ableitungsrinnen werden die o.g. Nachteile vermieden.First, a main advantage of the different embodiments with drainage channels is explained. Liquids with fibrous solids may, in a complicated designed passage opening to the problem that the fibers get stuck on exit from the housing in certain areas, so provided for receiving the weir plate grooves. This can happen especially during shutdowns, when the liquid ring collapses suddenly due to small centrifugal forces but constant gravitational force and the drum empties spontaneously. Especially in housings as a device for the discharge of liquid, as have been variously proposed in the prior art, product deposits can easily form, since a near-surface layer flow is formed, which can not rinse the central regions of the housing of solids. Due to the open design of the drainage channels, the o.g. Disadvantages avoided.
Nach den vorgeschlagenen neuen Einrichtungen zur Ableitung von Flüssigkeit aus der Zentrifugentrommel werden Ablagerungen auch vermieden, da die Flüssigkeit über den gesamten Flüssigkeitsquerschnitt und somit auch in Wandnähe des Auslasselements strömt und so Feststoffpartikel mitreißen kann. Dies ist ein Vorteil aus sanitärer Sicht aber auch konstruktiv hinsichtlich der verringerten Gefahr der Ausbildung von potentiellen Unwuchten aus nicht rotationssymmetrisch abgelagertem Feststoff. Solche ungleichmäßige Feststoffablagerungen können sich u. a. bilden, wenn die Zentrifuge angehalten wird und durch die zufällige Stillstandsposition des Rotors Feststoffe durch den zusammenbrechenden Flüssigkeitsring unsymmetrisch ausgespült werden oder auch der Feststoff selbst unsymmetrisch aus den Auslasselementen ausfließt.According to the proposed new means for discharging liquid from the centrifuge drum deposits are also avoided because the liquid flows over the entire liquid cross-section and thus also near the wall of the outlet and so can entrain solid particles. This is an advantage from a sanitary point of view but also constructive in terms of the reduced risk of the formation of potential imbalances made of non-rotationally symmetric deposited solid. Such uneven solid deposits may form, among other things, when the centrifuge is stopped and are flushed out of the random standstill position of the rotor solids by the collapsing liquid ring unbalanced or even the solid itself flows out of the outlet elements asymmetrically.
An den Varianten der Erfindung mit der offenen Ablaufrinne ist ferner vorteilhaft, dass die vorliegende Erfindung das Überlaufwehr an sich direkt an den Wehrplatten am Trommeldeckel belässt und erst die Flüssigkeit, welche das rotierende System bereits über das Überlaufwehr verlassen hat, in Umfangsrichtung umgelenkt wird. Nach dem Austritt aus der Trommel kann kein Kläreffekt mehr auftreten, der gesamte austretende Flüssigkeitsstrahl wird vielmehr durch die Ablenkeinrichtung in Umfangsrichtung abgelenkt.The variants of the invention with the open drainage channel is also advantageous in that the present invention leaves the overflow weir directly to the weir plates on the drum cover and only the liquid, which has already left the rotating system on the overflow weir, is deflected in the circumferential direction. After emerging from the drum, no clearing effect can occur any more, but the entire outgoing liquid jet is deflected by the deflector in the circumferential direction.
Vorteilhaft ist ferner, dass durch die gewählten Konstruktionen auch vermieden wird, dass die im Gehäuse enthaltene Flüssigkeit zu hohe unerwünschte zusätzliche Zentrifugalkräfte auf die Trommel ausüben. Insbesondere die Auslass- bzw. Ableitungsrinnen können sich nicht mit Flüssigkeit füllen, es bildet sich lediglich eine relativ dünne Flüssigkeitsschicht aus, die vergleichsweise nur kleine Zusatzkräfte ausübt.It is also advantageous that the chosen constructions also avoid that the liquid contained in the housing exert too high unwanted additional centrifugal forces on the drum. In particular, the outlet or discharge channels can not fill with liquid, it forms only a relatively thin layer of liquid that exerts relatively little additional forces.
Durch die Verlängerung von einem oder beiden Elementen "Bodenwand" und "einer oder beider Seitenwände" mit oben beschriebener Neigung in Richtung Rotationszentrum kann sichergestellt werden, dass die Abweichung der Flüssigkeitsabströmung von der idealen tangentialen Richtung minimiert wird.By extending one or both of the elements "bottom wall" and "one or both side walls" with the above-described inclination towards the center of rotation, it can be ensured that the deviation of the liquid outflow from the ideal tangential direction is minimized.
Die geneigten Durchlassöffnungen in der stirnseitigen Trommelwand kombiniert mit einer Wehrplatte ohne Auslasselement oder mit einer Wehrplatte, die eine "genutete" Kontur besitzt und im Besonderen der in die Trommelwand eingelassene Einsatz weisen den Vorteil auf, dass der in axialer Richtung benötigte Baumraum für den Rotor relativ klein ist. Hierdurch lässt sich der Materialeinsatz für den Rotor, das den Rotor tragende Gestell sowie das den Rotor umgebende Gehäuse minimieren. Zudem verkürzt sich der Lagerungsabstand, wodurch sich aufgrund der verbesserten maschinendynamischen Eigenschaften höhere Drehzahlen der Zentrifuge erzielen lassen, da sich die drehzahllimitierenden Eigenfrequenzen zu höheren Werten verschieben.The inclined passage openings in the end-face drum wall combined with a weir plate without outlet element or with a weir plate which has a "grooved" contour and in particular the embedded in the drum wall insert have the advantage that the required space in the axial direction for the rotor relative is small. This makes it possible to minimize the use of material for the rotor, the frame carrying the rotor and the housing surrounding the rotor. In addition, the storage distance is shortened, which can be due to the improved machine dynamics properties achieve higher speeds of the centrifuge, as the speed-limiting natural frequencies shift to higher values.
Die Ausführung mit in die Trommelwand eingelassenem Einsatz bietet den Vorteil, dass sich Anpassungen der Innenkontur an Produkteigenschaften und auch an Betriebsparameter, wie zum Beispiel die Durchsatzleistung ohne Änderungen der Trommelwand möglich sind. Die Einsätze können zudem leicht getauscht werden.The design with an insert embedded in the drum wall offers the advantage that adjustments of the inner contour to product properties and also to operating parameters, such as, for example, the throughput capacity are possible without changing the drum wall. The inserts can also be easily exchanged.
Weitere vorteilhafte Ausgestaltungen sind den übrigen Unteransprüchen zu entnehmen.Further advantageous embodiments can be found in the remaining subclaims.
Nachfolgend wird die Erfindung unter Bezug auf die Zeichnung näher beschrieben. Es zeigen:
- Fig. 1
- eine schematische Ansicht einer bekannten Vollmantel-Schneckenzentrifuge; und
- Fig. 2 - 14
- verschiedene Ansichten, Schnitte Darstellungen und Ausgestaltungen von Einrichtungen zum Ableiten von Flüssigkeit aus einer Zentrifugentrommel, ausgebildet an einem Trommeldeckel einer Zentrifugentrommel.
- Fig. 1
- a schematic view of a known solid bowl screw centrifuge; and
- Fig. 2-14
- various views, sections representations and embodiments of means for discharging liquid from a centrifuge drum formed on a drum lid of a centrifuge drum.
Den Figuren ist nachfolgend teilweise eine schematische Darstellung eines Koordinatensystems zugeordnet, in dessen Mittelpunkt die Rotationsachse D einer Zentrifugentrommel liegt und in dem der Pfeil U die Rotationsrichtung einer Zentrifugentrommel kennzeichnet. Die Linie D' bezeichnet eine Parallele zur Rotationsachse D und der Pfeil R die Radialrichtung senkrecht zur Drehachse D.The figures below is partially associated with a schematic representation of a coordinate system in the center of which the axis of rotation D of a centrifuge drum is located and in which the arrow U indicates the direction of rotation of a centrifuge drum. The line D 'denotes a parallel to the axis of rotation D and the arrow R the radial direction perpendicular to the axis of rotation D.
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 centric inlet pipe 7 serves to supply the centrifuged material via a
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. Further inward, a liquid phase forms.
Die Schnecke 5 rotiert mit einer etwas kleineren oder größeren Geschwindigkeit als die Trommel 3 und fördert den ausgeschleuderten Feststoff zum konischen Abschnitt hin aus der Trommel 3 zum Feststoffaustrag 13.The
Die Flüssigkeit strömt dagegen zum größeren Trommeldurchmesser am hinteren Ende des zylindrischen Abschnittes der Trommel 3 und wird 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 definiert damit eine Überlaufkante und damit auch das eigentliche Wehr bzw. das Überlaufwehr 21. Die Durchlassöffnung 15 und die Wehrplatte 19 mit dem Überlaufwehr 21 bilden in
Vorteilhaft ergänzt werden vorzugsweise sämtliche der vorstehenden Varianten durch eine radiale Verstellbarkeit der Wehrplatten 19. Diese Verstellbarkeit kann z.B. auch einfache Weise über Lochbilder 37 (siehe
Erfindungsgemäß kann z.B. bei einer Vollmantel-Schneckenzentrifuge nach Art der
Zunächst seien die Ausführungsbeispiele der
Die
Die Einrichtungen 23' weisen ferner jeweils eine Ableitungsrinne 25 auf, welche an die jeweilige Wehrplatte 19 angeformt und/oder integral mit dieser ausgebildet ist.The devices 23 'further each have a
Die Wehrplatte 19 der
Die Wehrplatten 19 der
Hierdurch wird das Wehr 21 in diesem Bereich auf einen weiter außen am Grund der Ausnehmung liegenden Radius R27 gelegt.As a result, the
Die Materialausnehmung 27 geht an der Außenseite der Wehrplatte 19 vorzugsweise fluchtend in die Ableitungsrinne 25 über. Sie bildet damit selbst den Beginn der Ableitungsrinne 25 aus.The
Die Ableitungsrinne 25 kann (siehe hierzu
Die Ableitungsrinne 25 ist zumindest an ihrer radial nach innen weisenden Seite sowie vorzugsweise auch an ihrem von der Wehrplatte 19 abgewandten Ende offen ausgebildet.The
Die Ableitungsrinne weist seitliche Umlenkwände 31a, 31b auf, die eben oder in sich gebogen ausgebildet sein können..The discharge channel has
Der Querschnitt der Ableitungsrinne 25 - siehe z.B.
Der Querschnitt der Ableitungsrinne 25 kann entsprechend eckig (
Nach
Bei den Einrichtungen zur Ableitung von Flüssigkeit 23' der
Das Überlaufwehr 21 der Ausführungsformen nach den
Nach den
Der Flüssigkeitsaustritt der Rinnen ist um einen Winkel β zur Drehachse D mit β > 0° und β vorzugsweise >= 20° und um einen Winkel γ relativ zur Rotationsrichtung U geneigt ausgerichtet. Für den Winkel γ gilt vorzugsweise: γ >= 0° und γ < 90° und besonders vorzugsweise: γ >= 0° und γ < 30°. Diese Ausgestaltung wird bevorzugt.The liquid outlet of the grooves is at an angle β to the rotation axis D with β> 0 ° and β preferably> = 20 ° and by an angle γ relative to the rotational direction U tilted. For the angle γ, the following applies preferably: γ> = 0 ° and γ <90 ° and particularly preferably: γ> = 0 ° and γ <30 °. This embodiment is preferred.
Alternativ ist es aber auch denkbar, dass der Winkel γ kleiner als 0° ist, beispielsweise auch kleiner als -30° (nicht dargestellt), auch wenn hierbei ein Austritt der Flüssigkeitsphase in Richtung des Trommeldeckels selbst erfolgt.Alternatively, it is also conceivable that the angle γ is less than 0 °, for example, less than -30 ° (not shown), even if this occurs an exit of the liquid phase in the direction of the drum cover itself.
Es ist aber auch denkbar, dass sich die Tiefe der Rinne(n) 25 verändert (insbesondere bezogen auf die Ebene entsprechend zu
Nach
Während die
Vorzugsweise gilt für den Neigungswinkel δ: δ >= 20° und δ <= 60° (
Jede der "geneigten" Durchlassöffnungen 15 wird vorzugsweise von einer korrespondierenden Wehrplatte 19 bis zu einem vorgegebenen Radius abgedeckt. Dabei kann diese abdeckende Wehrplatte 19 jeweils selbst eine "gerade" Überlaufkante bzw. Wehrkante 21 aufweisen, die auf einem vorgegebenen, vorzugsweise mittels Lochbildern oder dgl. einstellbaren Radius liegt.
Bevorzugt ist es dabei ferner denkbar, die "geneigten" Durchlassöffnungen mit Wehrplatten 19 nach Art der
It is also conceivable, the "inclined" passage openings with
So zeigen die
Die
Die Einsätze 41 in der Trommelwand bzw. in dem Trommeldeckel können auf verschiedene Weise ausgestaltet werden.The
So kann die axiale Erstreckung des Einsatzes 41 der axialen Dicke der Trommelwand bzw. der axialen Dicke des Trommeldeckels entsprechen (
Es ist theoretisch auch eine Variante des Einsatzes 41 realisierbar, bei welcher dieser - z.B. mit einem plattenartigen Flanschabschnitt oder dgl. - über die Stirnseite der Trommel hinausragt (nicht dargestellt). Denkbar ist zudem auch ein Einsatz 41 in der Trommelwand - wie vorstehend beschrieben, mit einer Abspritzkante (nicht dargestellt).It is also theoretically possible to implement a variant of the
Besonders vorteilhaft ist die Kombination aus dem Einsatz 41 in der Trommelwand nach Art der
Claims (16)
- Solid-bowl screw centrifuge having at least one device (23') for the discharge of clarified liquid from a rotatable drum (3),a. wherein the device (23') has at least one or more passage openings (15) in a drum cover (17),b. wherein the at least one passage opening (15) is assigned in each case one weir plate (19) which, at its radial inner edge, has and forms in each case one overflow weir (21),characterized in thatc. the weir plate (19) has a material recess which forms at least a part of a discharge channel (25) or a complete discharge channel (25),d. wherein the discharge channel (25) is designed such that it diverts the flow emerging from the drum counter to a direction of rotation and at an angle β > 0° and β <= 90° with respect to the axis of rotation and not in the direction of the drum cover.
- Solid-bowl screw centrifuge according to Claim 1, characterized in that, at the outer side (45), averted from the interior of the drum, of the weir plate (19), the material recess (27) transitions preferably in a flush manner into a channel element (29) which is attached to or integrally formed on the weir plate, such that the discharge channel (25) is formed from the material recess (27) and the channel element (29).
- Solid-bowl screw centrifuge according to one of the preceding claims, characterized in that the discharge channel (25) is of open form at least on its radially inwardly pointing side.
- Solid-bowl screw centrifuge according to one of the preceding claims, characterized in that the discharge channel (25) is of open form at its end averted from the weir plate (19).
- Solid-bowl screw centrifuge according to one or more of the preceding claims, characterized in that the channel element (29) is of open form entirely or in sections in a radially inward direction.
- Solid-bowl screw centrifuge according to one of the preceding claims, characterized in that the discharge channel (25) has lateral diverting walls (31a, 31b) which are oriented such that the flow emerging from the drum is inclined at the angle γ with respect to the direction of rotation or plane of rotation (U).
- Solid-bowl screw centrifuge according to one of the preceding claims, characterized in that the cross section of the discharge channel (25) is of polygonal or rounded design.
- Solid-bowl screw centrifuge according to one of the preceding claims, characterized in that the discharge channel (25) has a base wall (35) which runs rectilinearly in a tangential direction (U).
- Solid-bowl screw centrifuge according to one of the preceding claims, characterized in that the weir plate (19), at its side averted from the drum cover, does not have an elongated channel element (29) rather has merely the material recess (27), the side walls (31a, 31b) of which are oriented not axially but rather obliquely or in a curved manner with respect to the direction of rotation (U) or plane of rotation in order to thus divert the emerging flow somewhat or entirely in the direction of rotation or plane of rotation, such that the weir plates have a grooved form.
- Solid-bowl screw centrifuge according to one of the preceding claims, characterized in that the liquid outlet of the discharge channel (25) is oriented so as to be inclined by an angle γ relative to the plane of rotation.
- Solid-bowl screw centrifuge according to Claim 10, characterized in that, for the angle γ, the following applies: γ >= 0° and γ < 90°.
- Solid-bowl screw centrifuge according to one of the preceding claims, characterized in that the base wall (35, 35') of the discharge channel (25) has, over its entire length or in sections, a rounded form running in particular concentrically with respect to the centre of rotation.
- Solid-bowl screw centrifuge according to one of the preceding claims or according to the preamble of Claim 1, characterized in that the drum cover (17) has one or more passage openings (15) which are in each case oriented so as to be inclined by an angle δ with respect to the longitudinal axis (D) of the drum (1) in the circumferential direction or circumferential plane for the purposes of diverting emerging liquid counter to the direction of rotation, which angle is, at least in sections or preferably entirely, greater than 0° and smaller than 90° and for which angle in particular the following applies: δ >= 20° and δ<= 60°.
- Solid-bowl screw centrifuge according to Claim 13, characterized in that each of the inclined passage openings (15) is partially covered by a corresponding weir plate (19).
- Solid-bowl screw centrifuge according to one of the preceding claims, characterized in that, into the one or more passage openings (15), there is inserted in each case one insert (41), the inner contour of which is oriented so as to be inclined by an angle δ with respect to the axis of rotation (D) of the drum.
- Solid-bowl screw centrifuge according to one of the preceding Claims 13 to 15, characterized in that the angle δ is equal to the angle β.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102010061563A DE102010061563A1 (en) | 2010-12-27 | 2010-12-27 | Solid bowl centrifuge with overflow weir |
PCT/EP2011/072539 WO2012089492A1 (en) | 2010-12-27 | 2011-12-13 | Solid bowl screw centrifuge having an overflow weir |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2658656A1 EP2658656A1 (en) | 2013-11-06 |
EP2658656B1 true EP2658656B1 (en) | 2018-01-31 |
Family
ID=45319113
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11794487.6A Active EP2658656B1 (en) | 2010-12-27 | 2011-12-13 | Solid bowl screw centrifuge having an overflow weir |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2658656B1 (en) |
DE (1) | DE102010061563A1 (en) |
DK (1) | DK2658656T3 (en) |
WO (1) | WO2012089492A1 (en) |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DK176946B1 (en) * | 2007-05-09 | 2010-06-14 | Alfa Laval Corp Ab | Centrifugal separator and a liquid phase drain port element |
DK200801848A (en) * | 2008-12-30 | 2010-07-01 | Alfa Laval Corp Ab | A decanter centrifuge and a decanter centrifuge discharge port memeber. |
DK2659985T4 (en) * | 2011-07-29 | 2020-02-03 | Flottweg Se | Full casing worm centrifuge with overflow edge |
DK2551021T3 (en) * | 2011-07-29 | 2017-01-02 | Andritz Sas | Centrifuge and outlet opening element for a power reduction centrifuge |
DE102012106226A1 (en) * | 2012-07-11 | 2014-01-16 | Gea Mechanical Equipment Gmbh | Solid bowl centrifuge with overflow weir |
JP5220950B1 (en) | 2012-11-02 | 2013-06-26 | 巴工業株式会社 | Centrifugal separator with separation liquid injection nozzle |
DK2789395T4 (en) | 2013-04-08 | 2020-02-10 | Flottweg Se | Decanter centrifuge with an energy recovery unit |
JP2017018868A (en) * | 2015-07-08 | 2017-01-26 | 株式会社Ihi | Centrifugal separator |
DE102017130904B4 (en) * | 2017-12-21 | 2019-07-11 | Flottweg Se | Outlet device of a solid bowl screw centrifuge with a deflection chute |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56129842U (en) * | 1980-03-03 | 1981-10-02 | ||
DE3822983A1 (en) * | 1988-07-07 | 1990-01-11 | Hiller Gmbh | Solid-bowl worm centrifuge |
DE3900415A1 (en) | 1989-01-09 | 1990-07-12 | Teves Gmbh Alfred | Partial vacuum brake booster |
DE3904151A1 (en) | 1989-02-11 | 1990-08-16 | Heckmann Wolfgang | Centrifuge |
JP3543597B2 (en) | 1997-12-22 | 2004-07-14 | 株式会社クボタ | Separation water discharge device in horizontal centrifuge |
DE10203652B4 (en) | 2002-01-30 | 2006-10-19 | Westfalia Separator Ag | Solid bowl centrifuge with a weir |
US20040072668A1 (en) | 2002-10-15 | 2004-04-15 | Baker Hughes Incorporated | Liquid phase discharge port incorporating chamber nozzle device for centrifuge |
DK176946B1 (en) | 2007-05-09 | 2010-06-14 | Alfa Laval Corp Ab | Centrifugal separator and a liquid phase drain port element |
JP5009764B2 (en) * | 2007-12-06 | 2012-08-22 | 巴工業株式会社 | Horizontal centrifuge and dam forming member |
-
2010
- 2010-12-27 DE DE102010061563A patent/DE102010061563A1/en not_active Withdrawn
-
2011
- 2011-12-13 DK DK11794487.6T patent/DK2658656T3/en active
- 2011-12-13 WO PCT/EP2011/072539 patent/WO2012089492A1/en active Application Filing
- 2011-12-13 EP EP11794487.6A patent/EP2658656B1/en active Active
Also Published As
Publication number | Publication date |
---|---|
EP2658656A1 (en) | 2013-11-06 |
WO2012089492A1 (en) | 2012-07-05 |
DK2658656T3 (en) | 2018-05-07 |
DE102010061563A1 (en) | 2012-06-28 |
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