EP0534483B1 - Centrifugal separator with turbine - Google Patents

Centrifugal separator with turbine Download PDF

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Publication number
EP0534483B1
EP0534483B1 EP92116543A EP92116543A EP0534483B1 EP 0534483 B1 EP0534483 B1 EP 0534483B1 EP 92116543 A EP92116543 A EP 92116543A EP 92116543 A EP92116543 A EP 92116543A EP 0534483 B1 EP0534483 B1 EP 0534483B1
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EP
European Patent Office
Prior art keywords
classifier
turbo
wheel
fine material
centrifugal
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EP92116543A
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German (de)
French (fr)
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EP0534483A2 (en
EP0534483A3 (en
Inventor
Karl Kaufmann
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ENGMA ENGINEERS BEHEER
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ENGMA ENGINEERS BEHEER
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
    • B02C23/10—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of crushing or disintegrating zone
    • B02C23/12—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of crushing or disintegrating zone with return of oversize material to crushing or disintegrating zone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B7/00—Selective separation of solid materials carried by, or dispersed in, gas currents
    • B07B7/08—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force
    • B07B7/083—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force generated by rotating vanes, discs, drums, or brushes

Definitions

  • the invention relates to a turbo centrifugal classifier accordingly the preamble of claim 1.
  • an air classifier which has an inlet for viewing material, a Visual air inlet, at least one fine material-visual air mixture outlet and at least has a coarse material outlet. It is supported by one at both ends Provide the classifier wheel with a horizontal classifier wheel axis, with an additional one Vane ring delimiting visual space is arranged, the blades of which are in tangential flow direction to the classifier wheel circumference are adjustable and the determines the direction of flow of the classifying air.
  • This blade ring is in one Circular sector for the removal of the coarse material and has an in coarse material cutting arranged in this circular sector. The removal of the fine material / visual air mixture takes place axially over the end faces of the classifier wheel. That too classifying material is placed outside the blade ring in the classifier housing brought in.
  • the invention has for its object the turbo centrifugal classifier in terms of operating frequencies and in terms of improve the diameter-length ratio and at the same time the quality of the separation process to increase.
  • the fine material / visual air mixture is adjusted accordingly large sections of the classifier wheel with the for View necessary radial speed from the outside sucked inside and on correspondingly short lengths the classifier wheel with a much higher z. B. 3-6 times radial speed sucked inside out.
  • the arrangement of the sections has changed Suction and extraction on the classifier wheel jacket for the fine material / mixed air mixture according to the present invention the advantage that the pressure drop generated by the classifier wheel, which overcome by an external blower would have to be quashed, except for slight pressure drops becomes. Because this pressure drop for sifting at high Fineness is not insignificantly high and accordingly large, e.g. T. two-tier arranged one behind the other Blower and consequently correspondingly pressure-resistant air routing and filter devices would be necessary these in the present invention z. T. omitted, or essential be simplified.
  • Figure 1 shows a known grinding-visual cycle with a Turboflash force classifier with a classifier wheel 1 e.g. B. for grinding cement, des is acted upon by a ball mill 2 '.
  • the feed 9 ' can be regulated from a silo 4' via a cell lock 3 ' the ball mill 2 'supplied after grinding in the ball mill 2 'becomes the ball mill material 13' via a bucket elevator 11 'and a screw 6' with the exclusion of air by means of a Cell lock 3 'placed on the turbo centrifugal classifier.
  • the length of the turbo centrifugal classifier is carried out by a feed channel 10 '.
  • the classifying wheel 1 driven by a motor 7 ′ of the turbo centrifugal separator separates the spherical waste 13 'in coarse material 12' and fine material 17 'by means of the externally supplied Sight air 14 ', which is also the dedusting the ball mill 2 'can take over.
  • the coarse material 12 ' falls down into a screw conveyor 6 'and passes under the exclusion of air by means of a cell lock 3 'back to the task the ball mill 2.
  • the fine material 17 ' is together with the Sight air 14 'through the classifier wheel 1 of the turbo centrifugal classifier 1 suctioned off and fed cyclone separators 5 '.
  • a large Portion of fine material 17 ' is separated off there and by means of cell locks 3 'carried out.
  • FIGS 2 to 4 show different embodiments of the classifier wheel.
  • Figure 2 shows a double-sided classifying wheel 1 with a Diameter-length ratio D / L of approx. 1: 1.
  • the bigger one used for sighting, flowed from the outside inwards Length section 2 is by a seal 3 on the circumference the classifier wheel 1 from the smaller one, for extracting the fine air / air mixture 4 used, flowed through from the inside to the outside Length section 5 separately.
  • a visual space 6 is located yourself over the larger length section 2 and a Ventilation room 7, which is used to extract the fine air / air mixture 4 serves, is located above the shorter length section 5, which is also used as a fan with ventilation blades 8 of the same or larger diameter than it could be in the field of vision.
  • Figure 3 shows a double-sided classifying wheel 9 with a Diameter-length ratio D / L of approx. 1: 2. At this Arrangement there are two larger length sections 2 for sifting, which the fine air mixture 4 in a common to Suction provided length section 5 in the ventilation room Submit 7. Through two seals 3 on the circumference of the Classifier wheel 9 are classroom 6 and valve room 7 from each other Cut. Camp 10 is on both End faces of the classifier wheel 9. The classifier wheel 9 is driven by a motor 11 driven.
  • FIG. 4 shows a classifying wheel 12 mounted on two sides a diameter / length ratio D / L of approx. 1: 4.
  • This Classifier wheel is provided with two common, for suction Long sections 5 provided, each of larger, for Sighting sections 2 and 13 with fine air mixture 4 are fed, the middle length section 13 is approximately twice as large as a length segment 2.
  • the drive of the two-sided in bearings 10 Classifier wheel 12 in this case takes place by two motors 11, which are connected to the classifying wheel 12 with couplings, like the classifying wheels 1 and 9 with the motors 11.
  • sifter wheels can be used as in one Modular principle to be built and to one, the strength of the classifier wheel corresponding to any length a diameter / length ratio D / L of up to 1: 6 or Can be extended 1: 8.
  • FIG. 5 shows a longitudinal section A-B in FIGS. 6 and 7, Cross sections C-D and E-F in Fig. 5 of a turbo centrifugal classifier. It is a sifter with a diameter / length ratio D / L of approx. 1: 2.
  • the Classifier wheel 1 is one-sided via a shaft driven. Storage takes place on both sides in the Bearings 10, which are built on a lower housing part.
  • the classifier wheel 1 has two classrooms 6 for the intake and a ventilation room 7 for the extraction of the fine material-visual air mixture.
  • the classifier wheel blades have 6 and 6 in all rooms 7 same diameter. Located between rooms 6 and 7 themselves two seals 3, which prevent unsighted Feed material in the fine material classifying air space can reach.
  • the upper housing part which is the focus the classifier wheel 1 is separated from the lower housing part, has a visible material inlet 14.
  • Two double-sided air conveying troughs 15 distribute the feed in several on the Length of classifier wheel 1 attached tangentially in the direction of rotation Feed hopper 16, which ensure that the feed material evenly along the length of the classifier wheel 1 in the range of Visible space 6 is distributed.
  • the intake of the visual air 17 takes place via a suction opening 18 in the lower housing part and is arranged on the circumference of the classifying wheel 1
  • Air guide vanes 19 passed through such that the Visible air 17 tangentially on the classifier wheel 1 and that in inner circle of air guide vanes 19 fed feed tears with it and in a circular motion offset in the direction of rotation of the classifier wheel 1.
  • Both the suction opening 18 for the Intake of the visual air 17, as well as the suction nozzle 22 for the extraction of the fine material-air mixture be rotated by 90 ° around the classifier wheel axis by one favorable arrangement to be found in an overall system.

Abstract

The invention relates to a centrifugal separator with turbine and a fixed casing, which is provided with one or more inlets for material to be separated, one or more separating air inlets, one or more fines/separating air mixture outlets, one or more coarse fraction outlets, a separating turbine which is mounted in the casing on both end faces and has a horizontal turbine spindle, and a bucket ring which bends the separating chamber, aligns the separating air and has buckets which are adjustable both at a radial distance from the turbine spindle and to an inflow direction which is tangential to the circumference of the turbine, and are perforated in one segment to permit feeding of material to be separated and discharging of the coarse fraction. The invention is based on the object of devising a centrifugal separator with turbine, in which the turbine is designed both as a separator and as an operating fan, and in which separating air and fines blow through part of the turbine from the outside inwards at a correspondingly low radial speed for separation of the fines and flow from the inside outwards at a radial speed which is many times greater to discharge the separating air and the fines.

Description

Die Erfindung betrifft einen Turbo-Fliehkraftsichter entsprechend dem Oberbegriff des Anspruchs 1.The invention relates to a turbo centrifugal classifier accordingly the preamble of claim 1.

Auf dem Gebiet der Turbo-Fliehkraftsichter sind viele brauchbare Ausführungen bekannt. Das Prinzip der Sichtung in allen diesen Einrichtungen besteht darin, den in einem Luftstrom befindlichen Gutteilchen eine Fliehkraft entgegen der auf die Teilchen wirkenden Schleppkraft des Luftstromes aufzuzwingen und sie somit voneinander zu trennen. Hierzu führt man die mit Gutteilchen beladene Luft von außen nach innen durch ein sich schnell drehendes Sichterrad entgegen dem von diesem erzeugten Luftstrom, welcher von innen nach außen gerichtet ist. Hierzu verwendet man ein starkes Gebläse, das bewirkt, daß die Partikel die Umfangsgeschwindigkeit des Sichterrades und eine bestimmte Fliehkraft annehmen. Für bestimmte Gutteilchen (Grenzkorn) stellt sich am Umfang des Sichterrades ein Gleichgewicht zwischen der nach außen wirkenden Fliehkraft und der nach innen wirkenden Schleppkraft ein. Nur die entsprechend "feinen" Gutteilchen gelangen dann durch das Sichterrad nach innen in den Feingutbereich. Die entsprechend "groben" Gutteilchen bleiben im Außenbereich des Sichterrades und fallen als Grobgut an. There are many in the field of turbo centrifugal classifiers usable designs known. The principle of sighting in all of these institutions is the one in one Particles of good air present a centrifugal force against the drag force acting on the particles of the air flow to impose and thus separate them from each other. For this purpose, the air laden with particles of good is led from outside inside by a rapidly rotating classifier wheel against the air flow generated by it, which is directed from the inside out. For this you use a powerful blower that causes the particles the peripheral speed of the classifier wheel and a certain one Accept centrifugal force. For certain good particles (limit grain) there is a balance between the circumference of the classifier wheel the outward centrifugal force and the inward acting drag force. Only the correspondingly "fine" Good particles then get in through the classifier wheel in the fine goods area. The corresponding "coarse" particles remain outside the classifier wheel and fall as Coarse goods.

Der Sichtvorgang vollzieht sich nach folgender mathematischer Formel: dF = VR * DT * γL * ηγG * VU 2

dF =
Feingutdurchmesser
vR =
Radialgeschwindigkeit
vU =
Umfangsgeschwindigkeit
DT =
Sichterraddurchmesser
γL =
Luftdichte
η =
Luftzähigkeit
γG =
Sichtgutdichte
The visual process takes place according to the following mathematical formula: d F = V R * D T * γ L * η γ G * V U 2nd
d F =
Fine diameter
v R =
Radial velocity
v U =
Peripheral speed
D T =
Classifier wheel diameter
γ L =
Airtight
η =
Air toughness
γ G =
Visible density

Aus dieser Formel ist zu ersehen, daß in diesem Sichtvorgang mit höherer Umfangsgeschwindigkeit (vU) und kleiner werdendem Sichterraddurchmesser (DT) kleinere Feingutgrößen (dF) erreicht werden können. Die maximal zu erreichende Umfangsgeschwindigkeit (vU) ist aber durch die Kennwerte der verwendbaren Baustoffe für das Sichterradbegrenzt. Wählt man nun auch noch kleine Sichterraddurchmesser (DT), um die Feingutkorngröße zu verkleinern, so kommt man zu relativ kleinen Sichterradoberflächen. Die Oberfläche des Sichterrader bzw. deren freier Durchtrittsquerschnitt ist aber maßgebend für die zu erzielende Menge Feingut, die sich aus der relativ niedrigen Gutbeladung der Sichtluft und der möglichst niedrigen radialen Durchtrittsgeschwindigkeit (vR) bei der gegebenen Sichterradoberfläche für "hochfeine" Sichtgüter ergibt. Demzufolge muß man das Sichterrad also länger bauen. Dies hat aber zur Folge, daß sich auf der Sichterradlänge eine ungleichmäßige radiale Durchtrittsgeschwindigkeit ergibt und man dadurch eine feine bis gröbere Kornverteilung im Feingut erhält.It can be seen from this formula that smaller fines sizes (d F ) can be achieved in this classifying process with a higher peripheral speed (v U ) and a smaller classifier wheel diameter (D T ). The maximum circumferential speed (v U ) to be achieved is limited by the characteristic values of the building materials that can be used for the classifying wheel. If you now also choose small classifier wheel diameters (D T ) to reduce the fine grain size, you get relatively small classifier wheel surfaces. The surface of the classifier wheel or its free passage cross-section is, however, decisive for the amount of fine material to be obtained, which results from the relatively low loading of the classifying air and the lowest possible radial penetration speed (v R ) for the classifier wheel surface for "very fine" classifying goods. As a result, the classifier wheel has to be built longer. However, this has the consequence that an uneven radial passage speed results on the classifier wheel length and thus a fine to coarser grain distribution in the fine material is obtained.

Bei den herkömmlichen Einrichtungen wird in der Regel das Feingut-Sichtluft-Gemisch über die Stirnseiten des Sichterrades abgeführt. Aus dem Verhältnis von Länge (L) und Durchmesser (D) bei einseitiger Absaugung mit D/L von ca. 1:1 und bei zweiseitiger Absaugung mit D/L von ca. 1:2, ergeben sich daher nur relativ kurze nutzbare Sichterradlängen. Diese Konstruktionen haben den Nachteil, daß die Abführung des Feingut-Sichtluft-Gemisches mindestens bei zweiseitiger Absaugung durch die Lagerung und den Antrieb des Sichterrades behindert wird.This is usually the case with conventional equipment Fine material-visual air mixture over the end faces of the classifier wheel dissipated. From the ratio of length (L) and diameter (D) with one-sided suction with D / L of approx. 1: 1 and at double-sided suction with D / L of approx. 1: 2, result therefore only relatively short usable classifier wheel lengths. These constructions have the disadvantage that the removal of the fine material-visual air mixture at least with two-sided suction hindered by the storage and drive of the classifier wheel becomes.

Zwangsläufig ergeben sich dadurch auch große Lagerabstände mit niedrigen Eigenfrequenzen des Sichterrades, wodurch das Sichterrad für die gewünschten hohen Drehzahlen unbrauchbar wird. Bei Lagerung des Sichterrades im Feingut-Sichtluft-Gemisch bzw. bei Hindurchführung des Feingut-Sichtluft-Gemisches durch die Lagerung ergeben sich zudem unverhältnismäßig teure Konstruktionen, wobei das Durchmesser-Längen-Verhältnis von ca. 1:2 auch nicht überschritten werden kann. This inevitably results in large bearing distances with low natural frequencies of the classifier wheel, which makes the classifier wheel becomes unusable for the desired high speeds. When the classifier wheel is stored in a mixture of fine and visible air or when the fine material / visual air mixture is passed through storage also results in disproportionate expensive constructions, the diameter-length ratio cannot be exceeded by approx. 1: 2.

Aus der DE 38 14 458 ist ein Windsichter bekannt, der einen Sichtguteinlaß, einen Sichtlufteinlaß, wenigstens einen Feingut-Sichtluft-Gemisch-Auslaß und wenigstens einen Grobgut-Auslaß aufweist. Er ist mit einem an beiden Enden gelagerten Sichterrad mit horizontaler Sichterradachse versehen, wobei zusätzlich ein den Sichtraum begrenzender Schaufelkranz angeordnet ist, dessen Schaufeln in tangentialer Anströmungsrichtung zum Sichterradumfang verstellbar sind und der die Strömungsrichtung der Sichtluft bestimmt. Dieser Schaufelkranz ist in einem Kreissektor für die Abführung des Grobgutes durchbrochen und weist eine in diesem Kreissektor angeordnete Grobgutschneide auf. Die Abfuhr des Feingut-Sichtluft-Gemisches erfolgt axial über die Stirnseiten des Sichterrades. Das zu sichtende Sichtgut wird außerhalb des Schaufelkranzes in das Sichtergehäuse eingebracht.From DE 38 14 458 an air classifier is known which has an inlet for viewing material, a Visual air inlet, at least one fine material-visual air mixture outlet and at least has a coarse material outlet. It is supported by one at both ends Provide the classifier wheel with a horizontal classifier wheel axis, with an additional one Vane ring delimiting visual space is arranged, the blades of which are in tangential flow direction to the classifier wheel circumference are adjustable and the determines the direction of flow of the classifying air. This blade ring is in one Circular sector for the removal of the coarse material and has an in coarse material cutting arranged in this circular sector. The removal of the fine material / visual air mixture takes place axially over the end faces of the classifier wheel. That too classifying material is placed outside the blade ring in the classifier housing brought in.

Aus der US 3,767,045 ist ein Sichter mit geschlossenem Kreislauf bekannt, der zwei voneinander separat gelagerte Sichterräder aufweist, die jeweils einen Längenabschnitt aufweisen, der radial von innen nach außen durchströmt wird. Der jeweils andere radial von außen nach innen durchströmte Längenabschnitt der Sichterräder ist von einem Schaufelkranz umgeben. Auch bei diesem Sichter erfolgt die Zufuhr des zu sichtenden Sichtgutes außerhalb des Schaufelkranzes. From US 3,767,045 a classifier with a closed circuit is known, the two Separator wheels mounted separately from each other, each one Have length section, which is flowed through radially from the inside to the outside. Of the each other radially from the outside to the inside length section of the Classifier wheels are surrounded by a blade ring. Also done with this classifier the supply of the visible material to be sifted outside of the blade ring.

Der Erfindung liegt die Aufgabe zugrunde, den Turbo-Fliehkraftsichter hinsichtlich der Betriebsfrequenzen und hinsichtlich des Durchmesser-Längen-Verhältnisses zu verbessern und dabei gleichzeitig die Trenngüte des Sichtprozesses zu steigern.The invention has for its object the turbo centrifugal classifier in terms of operating frequencies and in terms of improve the diameter-length ratio and at the same time the quality of the separation process to increase.

Gelöst wird diese Aufgabe gemäß der Erfindung durch die im kennzeichnenden Teil des Anspruchs 1 angegebenen Merkmale. Zweckmäßige Ausgestaltungen der Erfindung ergeben sich aus den Unteransprüchen.This object is achieved according to the invention by the characterizing part of claim 1 specified features. Expedient refinements of the invention result from the subclaims.

Insbesondere wird das Feingut-Sichtluft-Gemisch auf entsprechend großen Längenabschnitten des Sichterrades mit der zum Sichten notwendigen Radialgeschwindigkeit von außen nach innen gesaugt und auf entsprechend kurzen Längenabschnitten des Sichterrades mit einer weitaus höheren, z. B. 3-6 fachen Radialgeschwindigkeit von innen nach außen gesaugt. Dadurch können z. B. Sichterradlängen mit einem wirksamen Sichtbereich von einem Durchmesser-Längen-Verhältnis von ca. 1:4 bis 1:8 konstruiert werden, wodurch sich wiederum die Durchsatzleistung wesentlich erhöhen läßt.In particular, the fine material / visual air mixture is adjusted accordingly large sections of the classifier wheel with the for View necessary radial speed from the outside sucked inside and on correspondingly short lengths the classifier wheel with a much higher z. B. 3-6 times radial speed sucked inside out. Thereby can e.g. B. classifier wheel lengths with an effective field of vision of a diameter-length ratio of approx. 1: 4 up to 1: 8, which in turn changes the Throughput can be increased significantly.

Außerdem hat die Anordnung der sektionsweise wechselnden An- und Absaugung auf dem Sichterradmantel für das Feingut-Sichtluft-Gemisch gemäß der vorliegenden Erfindung den Vorteil, daß das vom Sichterrad erzeugte Druckgefälle, welches für die Absaugung durch ein externes Gebläse überwunden werden müßte, bis auf geringe Druckverluste quasi aufgehoben wird. Da dieses Druckgefälle zum Sichten bei hoher Feinheit nicht unerheblich hoch ist und hierfür entsprechend große, z. T. zweistufige hintereinander angeordnete Gebläse und demzufolge auch entsprechend druckfeste Luftführungs- und Filtereinrichtungen notwendig wären, können diese bei vorliegender Erfindung z. T. entfallen, bzw. wesentlich vereinfacht werden.In addition, the arrangement of the sections has changed Suction and extraction on the classifier wheel jacket for the fine material / mixed air mixture according to the present invention the advantage that the pressure drop generated by the classifier wheel, which overcome by an external blower would have to be quashed, except for slight pressure drops becomes. Because this pressure drop for sifting at high Fineness is not insignificantly high and accordingly large, e.g. T. two-tier arranged one behind the other Blower and consequently correspondingly pressure-resistant air routing and filter devices would be necessary these in the present invention z. T. omitted, or essential be simplified.

Auch die Anordnung der Lagerungen und Antriebe an den nun nicht mehr für die Absaugung des Feingut-Sichtluft-Gemisches notwendigerweise zu verwendenden Stirnseiten können in einfacher, konventioneller Bauweise vorgesehen werden und erlauben bei z. B. großen notwendigen Antriebsleistungen die Anordnung der Antriebe an beiden Seiten des Sichterrades.The arrangement of the bearings and drives on the now no longer for the extraction of the fine material / visual air mixture can be used necessarily end faces be provided in a simple, conventional design and allow at z. B. large necessary drive power the arrangement of the drives on both sides of the classifier wheel.

Aufgrund der sich bei vorliegender Erfindung ergebenden Vorteile:

  • größere aktive Sichterradoberfläche
  • Aufhebung des Druckgefälles
  • einfache und konventionelle Anordnung von Lagerung und Regelantrieben
kann man größere Sichter zur Erzeugung feinster Feingüter bei höheren Durchsatzleistungen und geringeren Baukosten herstellen. Because of the advantages that result from the present invention:
  • larger active classifier wheel surface
  • Elimination of the pressure gradient
  • simple and conventional arrangement of bearings and control drives
you can produce larger classifiers for the production of the finest fine goods with higher throughput rates and lower construction costs.

Nachfolgend wird eine Sichteinrichtung gemäß vorliegender Erfindung anhand der beigefügten Zeichnungen beschrieben.In the following, a viewing device according to the present Invention described with reference to the accompanying drawings.

Es zeigt:

Fig. 1
eine schematische Darstellung eines bekannten Turbo-Fliehkraftsichters mit zugehörigem Mahl-Sichtkreislauf,
Fig. 2 - 4
Axialschnitte verschiedener Sichter gemäß der Erfindung,
Fig. 5
einen Schnitt längs der Linie A-B in Fig. 6 und 7,
Fig. 6
einen Schnitt längs der Linie C-D in Fig 5 und
Fig. 7
einen Schnitt längs der Linie E-F in Fig. 5.
It shows:
Fig. 1
1 shows a schematic representation of a known turbo centrifugal classifier with associated grinding and vision circuit,
Figs. 2-4
Axial sections of various classifiers according to the invention,
Fig. 5
6 shows a section along the line AB in FIGS. 6 and 7,
Fig. 6
a section along the line CD in Fig. 5 and
Fig. 7
a section along the line EF in Fig. 5th

Figur 1 zeigt einen bekannten Mahl-Sichtkreislauf mit einem Turbofliehkraftsichter mit einem Sichterrad 1 z. B. zur Vermahlung von Zement, des von einer Kugelmühle 2' beaufschlagt wird. Das Aufgabegut 9' wird aus einem Silo 4' über eine Zellenschleuse 3' regelbar der Kugelmühle 2' zugeführt nach dem Mahlen in der Kugelmühle 2' wird das Kugelmühlengut 13' über ein Becherwerk 11' und eine Schnecke 6' unter Luftabschluß mittels einer Zellenschleuse 3' auf den Turbo-Fliehkraftsichter aufgegeben. Eine Verteilung des Kugelmühlengutes 13' auf die ganze Länge des Turbo-Fliehkraftsichter erfolgt durch eine Aufgaberinne 10'. Das durch einen Motor 7' angetriebene Sichterrad 1 des Turbo-Fliehkraftsichters trennt das Kugelmülengut 13' in Grobgut 12' und Feingut 17' mittels der von außen zugeführten Sichtluft 14', die auch gleichzeitig die Entstaubung der Kugelmühle 2' mit übernehmen kann. Das Grobgut 12' fällt nach unten in eine Förderschnecke 6' und gelangt unter Luftabschluß mittels einer Zellenschleuse 3' zurück in die Aufgabe der Kugelmühle 2. Das Feingut 17' wird zusammen mit der Sichtluft 14' durch das Sichterrad 1 des Turbo-Fliehkraftsichters 1 abgesaugt und Zyklonabscheidern 5' zugeführt. Ein großer Anteil Feingut 17' wird dort abgeschieden und mittels Zellenschleusen 3' ausgetragen. Die Sichtluft 14' und der kleinere Anteil Feingut 17' gelangt in einen Entstaubungsfilter 16'. Dort wird das restliche Feingut 17' von der Sichtluft getrennt und ebenfalls über eine Zellenschleuse 3' ausgetragen. Ein Ventilator 15' saugt die Sichtluft 14' aus dem System an und fördert sie aus dem Mahlsichtkreislauf ins Freie. Für die Anwendung eines solchen Mahlsichtkreislaufes zur Herstellung sehr kleiner Feingutkorngrößen mußten bisher mehrere leistungsfähige Sichter nebeneinander gestellt werden, um die Durchsatzmenge aufnehmen zu können. Das führte zu komplizierteren und aufwendigeren Maschinenanordnungen, wobei die größte Schwierigkeit darin bestand, die nebeneinander angeordneten Sichter auf die gleiche Feingutkorngröße einzustellen, um ein einheitliches Produkt zu bekommen.Figure 1 shows a known grinding-visual cycle with a Turboflash force classifier with a classifier wheel 1 e.g. B. for grinding cement, des is acted upon by a ball mill 2 '. The feed 9 'can be regulated from a silo 4' via a cell lock 3 ' the ball mill 2 'supplied after grinding in the ball mill 2 'becomes the ball mill material 13' via a bucket elevator 11 'and a screw 6' with the exclusion of air by means of a Cell lock 3 'placed on the turbo centrifugal classifier. A distribution of the ball mill good 13 'over the whole The length of the turbo centrifugal classifier is carried out by a feed channel 10 '. The classifying wheel 1 driven by a motor 7 ′ of the turbo centrifugal separator separates the spherical waste 13 'in coarse material 12' and fine material 17 'by means of the externally supplied Sight air 14 ', which is also the dedusting the ball mill 2 'can take over. The coarse material 12 'falls down into a screw conveyor 6 'and passes under the exclusion of air by means of a cell lock 3 'back to the task the ball mill 2. The fine material 17 'is together with the Sight air 14 'through the classifier wheel 1 of the turbo centrifugal classifier 1 suctioned off and fed cyclone separators 5 '. A large Portion of fine material 17 'is separated off there and by means of cell locks 3 'carried out. The visible air 14 'and the smaller one Portion of fine material 17 'gets into a dedusting filter 16 '. There the remaining fine material 17 'is from the classifying air separated and also carried out via a cell lock 3 '. A fan 15 'draws the classifying air 14' out of the system and supports them from the grinding sight cycle into Free. For the application of such a grinding sight cycle previously had to produce very small fine grain sizes several powerful classifiers placed side by side to be able to record the throughput. The led to more complicated and more complex machine arrangements, the main difficulty being the sifters arranged side by side to the same fine grain size to get a single product.

Die Figuren 2 bis 4 zeigen verschiedene Ausführungsformen des Sichterrades.Figures 2 to 4 show different embodiments of the classifier wheel.

Figur 2 zeigt eine zweiseitig gelagertes Sichterrad 1 mit einem Durchmesser-Längen-Verhältnis D/L von ca. 1:1. Der größere, zum Sichten verwendete, von außen nach innen durchströmte Längenabschnitt 2 ist durch eine Dichtung 3 auf dem Umfang des Sichterrades 1 von dem kleineren, zum Absaugen des Feingut-Luftgemisches 4 verwendeten, von innen nach außen durchströmten Längenabschnittes 5 getrennt. Ein Sichtraum 6 befindet sich über dem größeren Längenabschnitt 2 und ein Ventilationsraum 7, der zum Absaugen des Feingut-Luftgemisches 4 dient, befindet sich über dem kürzeren Längenabschnitt 5, der auch als Ventilator mit Ventilationsschaufeln 8 gleichen oder größeren Durchmessers als diese im Sichtbereich ausgebildet sein könnte.Figure 2 shows a double-sided classifying wheel 1 with a Diameter-length ratio D / L of approx. 1: 1. The bigger one used for sighting, flowed from the outside inwards Length section 2 is by a seal 3 on the circumference the classifier wheel 1 from the smaller one, for extracting the fine air / air mixture 4 used, flowed through from the inside to the outside Length section 5 separately. A visual space 6 is located yourself over the larger length section 2 and a Ventilation room 7, which is used to extract the fine air / air mixture 4 serves, is located above the shorter length section 5, which is also used as a fan with ventilation blades 8 of the same or larger diameter than it could be in the field of vision.

Figur 3 zeigt ein zweiseitig gelagertes Sichterrad 9 mit einem Durchmesser-Längen-Verhältnis D/L von ca. 1:2. Bei dieser Anordnung gibt es zwei größere Längenabschnitte 2 zum Sichten, die das Feingut-Luftgemisch 4 in einen gemeinsamen zum Absaugen vorgesehenen Längenabschnitt 5 in den Ventilationsraum 7 abgeben. Durch zwei Dichtungen 3 am Umfang des Sichterrades 9 sind Sichtraum 6 und Ventilaitonsraum 7 voneinander getrennt. Lager 10 befindet sich auf beiden Stirnseiten des Sichterrades 9. Das Sichterrad 9 wird von einem Motor 11 angetrieben.Figure 3 shows a double-sided classifying wheel 9 with a Diameter-length ratio D / L of approx. 1: 2. At this Arrangement there are two larger length sections 2 for sifting, which the fine air mixture 4 in a common to Suction provided length section 5 in the ventilation room Submit 7. Through two seals 3 on the circumference of the Classifier wheel 9 are classroom 6 and valve room 7 from each other Cut. Camp 10 is on both End faces of the classifier wheel 9. The classifier wheel 9 is driven by a motor 11 driven.

Figur 4 zeigt ein zweiseitig gelagertes Sichterrad 12 mit einem Durchmesser-Längen-Verhältnis D/L von ca. 1:4. Dieses Sichterrad ist mit zwei gemeinsamen, zum Absaugen vorgesehenen Langenabschnitten 5 versehen, die von jeweils größeren, zum Sichten dienenden Längenabschnitten 2 und 13 mit Feingut-Luftgemisch 4 gespeist werden, wobei der mittlere Längenabschnitt 13 etwa doppelt so groß ist wie ein Längenabschnitt 2. Der Antrieb des in Lagern 10 zweiseitig gelagerten Sichterrades 12 erfolgt in diesem Fall durch zwei Motoren 11, die mit Kupplungen mit dem Sichterrad 12 verbunden sind, wie auch die Sichterräder 1 und 9 mit den Motoren 11.FIG. 4 shows a classifying wheel 12 mounted on two sides a diameter / length ratio D / L of approx. 1: 4. This Classifier wheel is provided with two common, for suction Long sections 5 provided, each of larger, for Sighting sections 2 and 13 with fine air mixture 4 are fed, the middle length section 13 is approximately twice as large as a length segment 2. The drive of the two-sided in bearings 10 Classifier wheel 12 in this case takes place by two motors 11, which are connected to the classifying wheel 12 with couplings, like the classifying wheels 1 and 9 with the motors 11.

In dieser Weise können Sichterräder gewissermaßen wie in einem Baukastenprinzip aufgebaut werden und zu einer, der Festigkeit des Sichterrades entsprechenden beliebigen Länge mit einem Durchmesser-Längenverhältnis D/L von bis zu 1:6 oder 1:8 verlängert werden.In this way, sifter wheels can be used as in one Modular principle to be built and to one, the strength of the classifier wheel corresponding to any length a diameter / length ratio D / L of up to 1: 6 or Can be extended 1: 8.

Figur 5 zeigt einen Längsschnitt A-B in Figur 6 und 7, Querschnitte C-D bzw. E-F in Fig. 5 eines Turbo-Fliehkraftsichters. Es handelt sich hierbei um einen Sichter mit einem Durchmesser-Längen-Verhältnis D/L von ca. 1:2. Das Sichterrad 1 ist über eine Welle einseitig angetrieben. Die Lagerung erfolgt zweiseitig in den Lagern 10, die auf einem Gehäuseunterteil aufgebaut sind. Das Sichterrad 1 hat zwei Sichträume 6 für die Ansaugung und einen Ventilationsraum 7 für die Absaugung des Feingut-Sichtluftgemisches. Die Sichterradblätter haben in allen Räumen 6 und 7 gleichen Durchmesser. Zwischen den Räumen 6 und 7 befinden sich zwei Dichtungen 3, die verhindern, daß ungesichtetes Aufgabegut in den Feingut-Sichtluft-Raum gelangen kann. Das Gehäuseoberteil, welches im Mittelpunkt des Sichterrades 1 vom Gehäuseunterteil getrennt ist, hat einen Sichtguteinlauf 14. Zwei doppelseitige Luft-Förderrinnen 15 verteilen das Aufgabegut in mehrere auf der Länge des Sichterrades 1 tangential in Drehrichtung angebrachte Aufgabetrichter 16, die dafür sorgen, daß das Aufgabegut gleichmäßig auf der Länge des Sichterrades 1 im Bereich des Sichtraumes 6 verteilt wird. Die Ansaugung der Sichtluft 17 erfolgt über eine Ansaugöffnung 18 im Gehäuseunterteil und wird durch die am Umfang des Sichterrades 1 angeordneten Luft-Leitschaufeln 19 hindurchgeführt, derart, daß die Sichtluft 17 tangential auf des Sichterrad 1 trifft und das im inneren Kreis der Luft-Leitschaufeln 19 zugeführte Aufgabegut mit sich reißt und in eine kreisende Bewegung in Drehrichtung des Sichterrades 1 versetzt. Hier setzt nun der schon anfangs beschriebene Sichtvorgang ein, der bewirkt, daß das Grobgut 20 nach außen geschleudert wird und das Feingut 21 mit der Sichtluft 17 durch den Sichtraum 6 gesaugt wird und als Feingut-Sichtluft-Gemisch über den Ventilationsraum 7 in den spiralförmigen Feingut-Sichtluft-Raum und den Absaugstutzen 22 einer Staubsammeleinrichtung zugeführt wird. Die Luft-Leitschaufeln 19 sind sowohl in der tangentialen Anströmrichtung 23 zum Sichterrad 1, als auch in ihrem Abstand 24 zum Mittelpunkt des Sichterrades 1 verstellbar angeordnet, um den optimalen Sichteffekt zu erzielen. Das Grobgut 20, welches am inneren Durchmesser der Luft-Leitschaufeln 19 kreist, wird durch Grobgutkanäle 25 im Bereich der Aufgabetrichter 16 abwechselnd mit diesen in einen bestimmten Sektor durch die Luft-Leitschaufeln 19 nach außen in den Grobgut-Sammelraum 26 abgeführt und mittels zweiseitig angeordneten Luft-Förderrinnen 27 dem Grobgutauslaß 28 zugeführt. Sowohl die Ansaugöffnung 18 für die Ansaugung der Sichtluft 17, als auch der Absaugstutzen 22 für die Absaugung des Feingut-Sicht-Luftgemisches können um jeweils 90° um die Sichterradachse gedreht werden, um eine günstige Anordnung in einer Gesamtanlage zu finden.FIG. 5 shows a longitudinal section A-B in FIGS. 6 and 7, Cross sections C-D and E-F in Fig. 5 of a turbo centrifugal classifier. It is a sifter with a diameter / length ratio D / L of approx. 1: 2. The Classifier wheel 1 is one-sided via a shaft driven. Storage takes place on both sides in the Bearings 10, which are built on a lower housing part. The classifier wheel 1 has two classrooms 6 for the intake and a ventilation room 7 for the extraction of the fine material-visual air mixture. The classifier wheel blades have 6 and 6 in all rooms 7 same diameter. Located between rooms 6 and 7 themselves two seals 3, which prevent unsighted Feed material in the fine material classifying air space can reach. The upper housing part, which is the focus the classifier wheel 1 is separated from the lower housing part, has a visible material inlet 14. Two double-sided air conveying troughs 15 distribute the feed in several on the Length of classifier wheel 1 attached tangentially in the direction of rotation Feed hopper 16, which ensure that the feed material evenly along the length of the classifier wheel 1 in the range of Visible space 6 is distributed. The intake of the visual air 17 takes place via a suction opening 18 in the lower housing part and is arranged on the circumference of the classifying wheel 1 Air guide vanes 19 passed through such that the Visible air 17 tangentially on the classifier wheel 1 and that in inner circle of air guide vanes 19 fed feed tears with it and in a circular motion offset in the direction of rotation of the classifier wheel 1. Here now the already described at the beginning, which causes that the coarse material 20 is thrown out and that Fine material 21 with the visual air 17 through the visual space 6 is sucked over and as a fine material-visual air mixture the ventilation space 7 in the spiral-shaped fine material class air space and the suction nozzle 22 of a dust collecting device is fed. The air guide vanes 19 are both in the tangential flow direction 23 to classifier wheel 1, as also adjustable in their distance 24 to the center of the classifying wheel 1 arranged to achieve the optimal visual effect. The coarse material 20, which on the inner diameter of the Air guide blades 19 circles, is through coarse material channels 25th in the area of the feed hopper 16 alternately with these in a specific sector through the air guide vanes 19 discharged to the outside into the coarse material collecting space 26 and by means of air conveying channels 27 arranged on both sides of the coarse material outlet 28 fed. Both the suction opening 18 for the Intake of the visual air 17, as well as the suction nozzle 22 for the extraction of the fine material-air mixture be rotated by 90 ° around the classifier wheel axis by one favorable arrangement to be found in an overall system.

Claims (13)

  1. Turbo-centrifugal classifier having a fixed housing, provided with one or more inlets (14) for material to be classified, with one or more classifying air inlets (18), with one or more outlets (22) for a mixture of fine material and classifying air, and with one or more coarse material outlets (28), provided with a classifier wheel (1, 9, 12), which is mounted at both its ends and has a horizontal classifier wheel axis, as well as with a blade ring, which bounds the classifying chamber, determines the direction of the classifying air and has blades (19) which can be adjusted in a tangential approach-flow direction relative to the classifier wheel circumference and are perforated in one sector for the removal of the coarse material, characterized in that
    the blades (19) of the blade ring can be adjusted in the radial direction of the classifier wheel axis,
    at least one charging hopper (16) for feeding the material to be classified is provided in the sector inside the blade ring,
    in that the classifier wheel (1, 9, 12) is constructed both as a classifier and as an operating fan, and in that for classifying the fine material, the classifier wheel (1, 9, 12) is flowed through in at least a first longitudinal section (2) by classifying air and fine material from the outside inwards at an appropriately low radial speed and, for removing classifying air and fine material, it is flowed through in at least a second longditudinal section (5) from the inside outwards at a radial speed which is several times higher.
  2. Turbo-centrifugal classifier according to Claim 1, characterized in that the classifier wheel (1, 9, 12) has relatively short second longitudinal sections (5) for removing classifying air and fine material at one or more locations, preferably in the middle, between two longer first longitudinal sections (2) for feeding classifying air and fine material.
  3. Turbo-centrifugal classifier according to Claim 2, characterized in that the diameter of the classifier wheel differs in size in the longitudinal sections (2, 5) for feeding and removing the mixture of fine material and classifying air.
  4. Turbo-centrifugal classifier according to Claim 2 or 3, characterized in that the relatively short second longitudinal sections (5) for removing the mixture of fine material and classifying air is constructed as a fan (8).
  5. Turbo-centrifugal classifier according to one of Claims 2 to 4, characterized in that seals (3) are fitted on the circumference of the classifier wheel between the longitudinal sections (2, 5) for feeding and removing the mixture of fine material and classifying air.
  6. Turbo-centrifugal classifier according to one of Claims 2 to 5, characterized in that the diameter/length ratio in the first longitudinal sections (2) for feeding the mixture of fine material and classifying air is a ratio of 1:1 or higher.
  7. Turbo-centrifugal classifier according to one of Claims 1 to 6, characterized in that the classifier wheel is driven at both ends in the case of relatively large classifier units.
  8. Turbo-centrifugal classifier according to one of Claims 1 to 7, characterized in that the drive of the classifier wheel can be controlled.
  9. Turbo-centrifugal classifier according to one of Claims 1 to 8, characterized in that the inlet and outlet of large material and coarse material in the first longitudinal sections (2) are arranged in one or more blade sectors in such a way that charge material is fed tangentially to the Classifier wheel and coarse material is led off tangentially to the classifier wheel, in an alternating fashion.
  10. Turbo-centrifugal classifier according to one of Claims 1 to 9, characterized in that the charge material is fed pneumatically.
  11. Turbo-centrifugal classifier according to Claim 10, characterized in that the charge material is previously dispersed before being fed.
  12. Turbo-centrifugal classifier according to one of Claims 2 to 11, characterized in that a plurality of feed and removal devices are distributed over the classifier wheel, in order to load the latter evenly.
  13. Turbo-centrifugal classifier according to one of Claims 1 to 12, characterized in that the radial speed for removing the mixture of fine material and classifying air is 3 to 6 times higher than the radial speed for feeding the mixture of fine material and classifying air.
EP92116543A 1991-09-27 1992-09-28 Centrifugal separator with turbine Expired - Lifetime EP0534483B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4132339 1991-09-27
DE4132339A DE4132339C2 (en) 1991-09-27 1991-09-27 Turbo centrifugal classifier

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EP0534483A2 EP0534483A2 (en) 1993-03-31
EP0534483A3 EP0534483A3 (en) 1994-10-26
EP0534483B1 true EP0534483B1 (en) 1998-03-25

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10350518A1 (en) * 2003-10-29 2005-06-09 Khd Humboldt Wedag Ag Granular product separating mechanism, has static cascade separator parts including rod-shaped baskets that are oppositely arranged and rotatable, where baskets` discharge ends are led into outlet body
DE102018132155B3 (en) * 2018-12-13 2019-12-12 Netzsch-Feinmahltechnik Gmbh FLOWERS WITH SPECIAL FAN WHEEL

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3767045A (en) * 1970-03-18 1973-10-23 Siempelkamp Gmbh & Co Closed circuit multi-stage air classifier
DE3814458A1 (en) * 1988-04-28 1989-11-09 Krupp Polysius Ag Air separator

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE521082C (en) * 1925-11-07 1931-03-16 Hermann Hildebrandt Classifier with a classifier wheel upstream of a blower
US4409097A (en) * 1981-10-16 1983-10-11 Omya Gmbh Improved pivotable centrifugal classifier and method of classifying
DE3539512A1 (en) * 1985-11-07 1987-05-14 Krupp Polysius Ag SAFE

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3767045A (en) * 1970-03-18 1973-10-23 Siempelkamp Gmbh & Co Closed circuit multi-stage air classifier
DE3814458A1 (en) * 1988-04-28 1989-11-09 Krupp Polysius Ag Air separator

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DE4132339A1 (en) 1993-04-08
ATE164331T1 (en) 1998-04-15
EP0534483A2 (en) 1993-03-31
DE59209249D1 (en) 1998-04-30
DE4132339C2 (en) 1993-12-02
EP0534483A3 (en) 1994-10-26

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