EP0250921B1 - Air classifier - Google Patents

Air classifier Download PDF

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Publication number
EP0250921B1
EP0250921B1 EP87108132A EP87108132A EP0250921B1 EP 0250921 B1 EP0250921 B1 EP 0250921B1 EP 87108132 A EP87108132 A EP 87108132A EP 87108132 A EP87108132 A EP 87108132A EP 0250921 B1 EP0250921 B1 EP 0250921B1
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EP
European Patent Office
Prior art keywords
classifying
air
rotor
classifier
elements
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EP87108132A
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German (de)
French (fr)
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EP0250921A3 (en
EP0250921A2 (en
Inventor
Gotthardt Dipl.-Ing. Blasczyk
Heinrich Dipl.-Ing. Henne
Hubert Dipl.-Ing. Eickholt
Otte Dipl.-Ing. Heinemann
Norbert Bredenhöller
Peter Dipl.-Ing. Tiggesbäumker
Ludger Dipl.-Ing. Kimmeyer
Michael Dr.-Ing. Von Seebach
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ThyssenKrupp Industrial Solutions AG
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Krupp Polysius AG
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Publication of EP0250921A2 publication Critical patent/EP0250921A2/en
Publication of EP0250921A3 publication Critical patent/EP0250921A3/en
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Classifications

    • 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
    • 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
    • B07B11/00—Arrangement of accessories in apparatus for separating solids from solids using gas currents
    • B07B11/04—Control arrangements

Definitions

  • a classifier with the generic features of claim 1 mentioned above is known from US-A-3,015,392.
  • an intermediate ring is provided inside the rotor, which divides the interior of the rotor into an active lower part and a non-active part divided upper part and which can be adjusted in the vertical direction by means of a threaded spindle.
  • the air flow in the classifier is adjusted to a desired height range in the known classifier.
  • the division of the spiral serving to supply the viewing air by one or more horizontal dividing walls is provided in the known classifier in order to achieve a uniform air distribution over the entire vertical height of the viewing room.
  • a classifier is also known from SU-A-816 574, in which the visible material is thrown radially outward from a spreading disc and here enters a spirally rising air stream which takes the fine material with it while the coarse material falls down. In the area of the cone rings arranged below the spreading disc, the downward flow of coarse material is checked.
  • the classifying air is supplied via two channels, firstly into the actual classroom surrounding the spreading disc and secondly - for the purpose of indulgence - below the spreading disc into the area of the two cone parts.
  • a common throttle is provided, by means of which the air flow can be directed more into the upper or more into the lower chamber, so that a more or less large proportion of the total constant air volume for the actual sighting (in the lower room ) can be provided.
  • a classifier is known in which the outer wall of the classroom and the rotor by ring slide have closable air inlet or air outlet openings, the dwell time of the classifying air in the classifier and the flow direction can be changed by adjusting the ring slide.
  • the invention has for its object to develop a classifier corresponding to the type mentioned in such a way that the selectivity improves and in particular entrainment of coarse material is avoided by the fine air loaded with sifting air.
  • the amount and / or the speed of the sight air flowing into the individual height areas of the sight space can be optimally adapted to the respective conditions, in particular the load in the individual sight space areas. If the distribution of the classifying air in the vertical direction is controlled and adjusted in this way before entering the classifying room, it is particularly avoided that the classifying air flows into the lower area of the classifying room and leads to undesired entrainment of coarse particles into the fine material room, while the sighting in the upper area of the visual space is deteriorated at the same time.
  • the possibility of adjustment according to the invention can therefore achieve a significant improvement in the selectivity of the classifier.
  • the housing of the sifter shown contains in the upper region a spiral 1 for supplying the viewing air, which opens tangentially into the viewing space 2 and is divided into two channels 5, 6 and 7 by three horizontal dividing walls 3, 4.
  • elements designed as adjustable flaps 8, 9, 10 are provided for setting the amount of air supplied to the individual channels 5, 6, 7.
  • the flaps 8, 9, 10 arranged in pairs are actuated, for example, via setting levers 11 and chains 12, the flaps 8, 9 and 10 being adjustable independently of one another.
  • a rotor 13 is arranged in the classifier housing and can be rotated about a vertical axis 14 and is driven via a shaft 15 by a motor (not illustrated) arranged on the classifier housing.
  • the rotor 13 is equipped on its circumference with rotor blades 16 which are carried by ring disks 17 which are connected via webs 18 to a bush 19 surrounding the shaft 15.
  • the shaft 15 is supported at the lower end in a bearing 20 which is supported by radial struts 21.
  • the lower end face of the rotor 13 is open and has radially extending struts 22.
  • the upper end face of the rotor 13 is formed by a plate 23 which carries distributor strips 24 arranged radially on its upper side.
  • a deflection ring 27 is provided at a distance from the circumference of the plate 23, which deflects the visible material thrown off the plate 23 downward into the viewing space 2.
  • the classifier housing is provided with a funnel 28 for removing the coarse material. Furthermore, there is a further funnel 29 below the open lower end face of the rotor 13, to which a plurality of connections 30 (for example four connections 30 evenly distributed around the circumference) are connected in the exemplary embodiment shown.
  • Air guiding elements 31 are provided at the outlet end of the spiral 1 for supplying the classifying air. As FIG. 2 shows, these air guide elements 31 are inclined in the sense of the flow direction of the viewing air flowing approximately tangentially into the viewing space 2.
  • the function of the sifter shown is as follows: The visible material that is fed in via the air conveyor trough 25 and the distributor bell 26 in a uniform distribution to the center of the plate 23 is conveyed outwards by the movement of the rotor 13 and is additionally evened out by the distributor strips 24. The visible material is thrown off the plate 23 with a moderate radial speed component and deflected downward by the deflection ring 27. It then penetrates the view space 2 from top to bottom in the form of a uniform good veil.
  • the classifying air is supplied via channels 5, 6 and 7 to the spiral 1, the amount of classifying air flowing into the individual height areas of the classifying area 2 being optimally adapted to the respective conditions by adjusting the flaps 8, 9 and 10. Since there is generally a larger load in the upper area of the viewing space 2, it is usually expedient to operate the upper duct 5 with a larger amount of air than the lower duct 7.
  • the fine and coarse goods are separated. While the coarse material falls down and is discharged through the funnel 28, the fine material together with the classifying air reaches the interior of the rotor 13 and is discharged via the connections 30.
  • the air guiding elements 31 at the outlet end the spiral 1 serve to maintain the swirl of the air flow, while the rotor blades 16 predominantly fulfill the task of preventing coarse material particles adhering to the fine material from entering the interior of the rotor 13.
  • the sifting air laden with fine material discharged via the connections 30 reaches one or more external separators in which the fine material (finished product) is separated from the sifting air.
  • the classifying air can then be fed to the spiral 1 again via an external air circulation fan (air circulation mode). Instead, however, it is also possible to discard the fine air that has been freed from the fine material (possibly after further dedusting) and to suck in the clear air from the environment (one pass of the clear air through the classifier).
  • the fine air loaded with fine material can also be drawn off through the upper end of the rotor.
  • a system of channels arranged in a star shape is expediently provided on the upper end face of the rotor instead of a closed plate 23, which are only open at their inner and outer ends and through which the visible material fed centrally via the distributor bell 26 is fed to the viewing space 2 .
  • the spiral 1 in three arranged one above the other Channels 5, 6 and 7 is divided, it is of course also possible within the scope of the invention to provide only two or more than three channels.
  • the spiral 1 also has a second air inlet opening 32, which is offset on the circumference by approximately 180 ° with respect to the other air inlet opening 33. Also in the area of this second air inlet opening 32, elements (e.g. flaps) are provided for setting the amount of air supplied through the individual channels. Such additional air inlet openings promote the maintenance of the swirl with which the classifying air enters the classroom 2.
  • the setting option according to the invention not only achieves a significant improvement in the separating power of the classifier, but it also reduces the specific air requirement of the classifier overall, which enables considerable energy savings.

Landscapes

  • Combined Means For Separation Of Solids (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)

Description

Die Erfindung betrifft einen Sichter, enthaltend

  • a) ein Sichtergehäuse mit einer tangential in den Sichtraum einmündenden, an ihrem austrittsseitigen Ende mit Luftleitelementen versehenen Spirale zur Zuführung der Sichtluft, einem Raum zur Abführung des Grobgutes sowie wenigstens einem Anschluß zur Abführung der mit Feingut beladenen Sichtluft,
  • b) einen um eine vertikale Achse drehbaren Rotor, der an seinem Umfang mit achsparallel angeordneten Elementen besetzt ist und im Bereich einer Stirnseite eine Öffnung zum Austritt der mit Feingut beladenen Sichtluft aufweist,
  • c) Einrichtungen zur Aufgabe des Sichtgutes auf die obere Stirnseite des Rotors sowie zur Umlenkung des vom Rotor nach außen geführten Sichtgutes, so daß das Sichtgut den ringförmigen Sichtraum zwischen den ortsfesten Luftleitelementen und den achsparallel angeordneten Elementen des Rotors von oben nach unten durchsetzt,
  • d) sowie Trennwände, die die zur Zuführung der Sichtluft dienende Spirale in wenigstens zwei übereinanderliegende Kanäle unterteilen, aus denen die Sichtluft in unterschiedlicher Höhe etwa tangential in den Sichtraum einströmt.
The invention relates to a classifier containing
  • a) a classifier housing with a spiral which opens tangentially into the classifying chamber and is provided at its outlet end with air guiding elements for supplying the classifying air, a room for removing the coarse material and at least one connection for removing the classifying air loaded with fine material,
  • b) a rotor which can be rotated about a vertical axis and which is equipped on its circumference with elements arranged parallel to the axis and in the region of an end face has an opening for the outlet of the fine air loaded with fine material,
  • c) devices for feeding the material to be sighted onto the upper end face of the rotor and for deflecting the material to be sighted outward from the rotor, so that the material to be sighted penetrates the ring-shaped viewing space between the stationary air guiding elements and the elements of the rotor which are arranged axially parallel, from top to bottom,
  • d) and dividing walls which divide the spiral serving to supply the viewing air into at least two superimposed channels from which the viewing air flows at different heights approximately tangentially into the viewing area.

Ein Sichter mit den vorstehend genannten Gattungsmerkmalen des Anspruches 1 ist aus der US-A-3 015 392 bekannt. Bei diesem Sichter ist im Innern des Rotors ein Zwischenring vorgesehen, der den Innenraum des Rotors in einen aktiven unteren Teil und einen nicht aktiven oberen Teil unterteilt und der sich mittels einer Gewindespindel in vertikaler Richtung verstellen läßt. Durch Höheneinstellung dieses Zwischenringes wird bei dem bekannten Sichter die Luftströmung im Sichtraum auf einen gewünschten Höhenbereich eingestellt.A classifier with the generic features of claim 1 mentioned above is known from US-A-3,015,392. In this classifier, an intermediate ring is provided inside the rotor, which divides the interior of the rotor into an active lower part and a non-active part divided upper part and which can be adjusted in the vertical direction by means of a threaded spindle. By adjusting the height of this intermediate ring, the air flow in the classifier is adjusted to a desired height range in the known classifier.

Die Unterteilung der zur Zuführung der Sichtluft dienenden Spirale durch eine oder mehrere horizontale Trennwände ist bei dem bekannten Sichter vorgesehen, um eine gleichmäßige Luftverteilung über die ganze vertikale Höhe des Sichtraumes zu erzielen.The division of the spiral serving to supply the viewing air by one or more horizontal dividing walls is provided in the known classifier in order to achieve a uniform air distribution over the entire vertical height of the viewing room.

Durch die SU-A-816 574 ist weiterhin ein Sichter bekannt, bei dem das Sichtgut von einem Streuteller radial nach außen geschleudert wird und hier in einen spiralig aufsteigenden Luftstrom gelangt, der das Feingut mitnimmt, während das Grobgut nach unten ausfällt. Im Bereich von unterhalb des Streutellers angeordneten Konusringen erfolgt eine Nachsichtung des nach unten ausfallenden Grobgutstromes. Die Sichtluft wird bei diesem Sichter über zwei Kanäle zugeführt, und zwar zum einen in den eigentlichen Sichtraum, der den Streuteller umgibt, und zum anderen - zum Zwecke der Nachsichtung - unterhalb des Streutellers in den Bereich der beiden Konusteile. Am Einlaß der beiden Luftzuführkammern ist eine gemeinsame Drossel vorgesehen, durch deren Einstellung der Luftstrom mehr in die obere oder mehr in die untere Kammer gelenkt werden kann, so daß ein mehr oder weniger großer Anteil der insgesamt konstanten Luftmenge für die eigentliche Sichtung (im unteren Raum) vorgesehen werden kann.A classifier is also known from SU-A-816 574, in which the visible material is thrown radially outward from a spreading disc and here enters a spirally rising air stream which takes the fine material with it while the coarse material falls down. In the area of the cone rings arranged below the spreading disc, the downward flow of coarse material is checked. In this classifier, the classifying air is supplied via two channels, firstly into the actual classroom surrounding the spreading disc and secondly - for the purpose of indulgence - below the spreading disc into the area of the two cone parts. At the inlet of the two air supply chambers, a common throttle is provided, by means of which the air flow can be directed more into the upper or more into the lower chamber, so that a more or less large proportion of the total constant air volume for the actual sighting (in the lower room ) can be provided.

Aus der DE-B 11 30 261 ist ein Sichter bekannt, bei dem die Außenwand des Sichtraumes und der Rotor durch Ringschieber verschließbare Lufteintritts- bzw. Luftaustrittsöffnungen aufweisen, wobei durch Einstellung der Ringschieber die Verweilzeit der Sichtluft im Sichter und die Strömungsrichtung geändert werden können.From DE-B 11 30 261 a classifier is known in which the outer wall of the classroom and the rotor by ring slide have closable air inlet or air outlet openings, the dwell time of the classifying air in the classifier and the flow direction can be changed by adjusting the ring slide.

Der Erfindung liegt die Aufgabe zugrunde, einen Sichter entsprechend der eingangs genannten Gattung dahingehend weiterzuentwickeln, daß die Trennschärfe verbessert und insbesondere ein Mitreißen von Grobgut durch die mit Feingut beladene Sichtluft vermieden wird.The invention has for its object to develop a classifier corresponding to the type mentioned in such a way that the selectivity improves and in particular entrainment of coarse material is avoided by the fine air loaded with sifting air.

Diese Aufgabe wird erfindungsgemäß durch folgende Merkmale gelöst:

  • a) der Raum zur Abführung des Grobgutes ist als Trichter ausgebildet;
  • b) die am Umfang des Rotors achsparallel angeordneten Elemente werden durch übereinander angeordnete Gruppen von Rotorschaufeln gebildet, die von Ringscheiben getragen werden, die über Stege mit einer die Rotorwelle umgebenden Buchse verbunden sind;
  • c) im Eintrittsbereich der Spirale sind Elemente (Klappen) zur Einstellung der Menge und/oder Geschwindigkeit der durch diese Kanäle in die einzelnen Höhenbereiche des Sichtraumes einströmenden Sichtluft vorgesehen.
This object is achieved according to the invention by the following features:
  • a) the space for removing the coarse material is designed as a funnel;
  • b) the elements arranged axially parallel on the circumference of the rotor are formed by groups of rotor blades arranged one above the other, which are supported by ring disks which are connected via webs to a bushing surrounding the rotor shaft;
  • c) in the entry area of the spiral elements (flaps) are provided for adjusting the amount and / or speed of the viewing air flowing through these channels into the individual height areas of the viewing area.

Auf diese Weise kann man die Menge und/oder die Geschwindigkeit der in die einzelnen Höhenbereiche des Sichtraumes einströmenden Sichtluft den jeweiligen Verhältnissen, insbesondere der Gutbeladung in den einzelnen Sichtraumbereichen optimal anpassen. Wird auf diese Weise die Verteilung der Sichtluft in vertikaler Richtung vor Eintritt in den Sichtraum kontrolliert und eingestellt, so wird insbesondere vermieden, daß die Sichtluft verstärkt in den unteren Bereich des Sichtraumes einströmt und hier zu einem unerwünschten Mitreißen von Grobgutteilchen in den Feingutraum führt, während die Sichtung im oberen Bereich des Sichtraumes gleichzeitig verschlechtert wird. Durch die erfindungsgemäße Einstellmöglichkeit läßt sich daher eine wesentliche Verbesserung der Trennschärfe des Sichters erzielen.In this way, the amount and / or the speed of the sight air flowing into the individual height areas of the sight space can be optimally adapted to the respective conditions, in particular the load in the individual sight space areas. If the distribution of the classifying air in the vertical direction is controlled and adjusted in this way before entering the classifying room, it is particularly avoided that the classifying air flows into the lower area of the classifying room and leads to undesired entrainment of coarse particles into the fine material room, while the sighting in the upper area of the visual space is deteriorated at the same time. The possibility of adjustment according to the invention can therefore achieve a significant improvement in the selectivity of the classifier.

Zweckmäßige Ausgestaltungen der Erfindung sind Gegenstand der Unteransprüche.Appropriate embodiments of the invention are the subject of the dependent claims.

Ein Auführungsbeispiel der Erfindung ist in der Zeichnung veranschaulicht. Es zeigen

Fig.1
einen Vertikalschnitt durch den erfindungsgemäßen Sichter,
Fig.2
einen Schnitt längs der Linie II der Fig.1,
Fig. 3
einen Schnitt längs der Linie III der Fig.2.
An exemplary embodiment of the invention is illustrated in the drawing. Show it
Fig. 1
a vertical section through the classifier according to the invention,
Fig. 2
2 shows a section along the line II in FIG. 1,
Fig. 3
a section along the line III of Fig.2.

Das Gehäuse des dargestellten Sichters enthält im oberen Bereich eine zur Zuführung der Sichtluft dienende Spirale 1, die tangential in den Sichtraum 2 einmündet und die durch zwei horizontale Trennwände 3, 4 in drei übereinanderliegende Kanäle 5, 6 und 7 unterteilt ist. Im Eintrittsbereich der Spirale (vergleiche Fig.2 und 3) sind als verstellbare Klappen 8, 9, 10 ausgebildete Elemente zur Einstellung der den einzelnen Kanälen 5, 6, 7 zugeführten Luftmenge vorgesehen. Die Betätigung der paarweise angeordneten Klappen 8, 9, 10 erfolgt beispielsweise über Stellhebel 11 und Ketten 12, wobei die Klappen 8, 9 und 10 unabhängig voneinander einstellbar sind.The housing of the sifter shown contains in the upper region a spiral 1 for supplying the viewing air, which opens tangentially into the viewing space 2 and is divided into two channels 5, 6 and 7 by three horizontal dividing walls 3, 4. In the entry area of the spiral (see FIGS. 2 and 3), elements designed as adjustable flaps 8, 9, 10 are provided for setting the amount of air supplied to the individual channels 5, 6, 7. The flaps 8, 9, 10 arranged in pairs are actuated, for example, via setting levers 11 and chains 12, the flaps 8, 9 and 10 being adjustable independently of one another.

Im Sichtergehäuse ist ein Rotor 13 angeordnet, der um eine vertikale Achse 14 drehbar ist und über eine Welle 15 von einem auf dem Sichtergehäuse angeordneten, nicht veranschaulichten Motor angetrieben wird.A rotor 13 is arranged in the classifier housing and can be rotated about a vertical axis 14 and is driven via a shaft 15 by a motor (not illustrated) arranged on the classifier housing.

Der Rotor 13 ist an seinem Umfang mit Rotorschaufeln 16 besetzt, die von Ringscheiben 17 getragen werden, die über Stege 18 mit einer die Welle 15 umgebenden Buchse 19 verbunden sind. Die Welle 15 ist am unteren Ende in einem Lager 20 gelagert, das von radialen Streben 21 getragen wird. Die untere Stirnseite des Rotors 13 ist offen ausgebildet und weist radial verlaufende Streben 22 auf.The rotor 13 is equipped on its circumference with rotor blades 16 which are carried by ring disks 17 which are connected via webs 18 to a bush 19 surrounding the shaft 15. The shaft 15 is supported at the lower end in a bearing 20 which is supported by radial struts 21. The lower end face of the rotor 13 is open and has radially extending struts 22.

Die obere Stirnseite des Rotors 13 wird durch einen Teller 23 gebildet, der an seiner Oberseite radial angeordnete Verteilerleisten 24 trägt.The upper end face of the rotor 13 is formed by a plate 23 which carries distributor strips 24 arranged radially on its upper side.

Zur Aufgabe des Sichtgutes auf den Teller 23 dient eine Luftförderrinne 25, an die sich eine Verteilerglocke 26 anschließt, die die Welle 15 koaxial umgibt und deren untere Öffnung 26a über dem Zentrum des Tellers 23 ausmündet.An air conveyor trough 25, to which a distributor bell 26 adjoins, coaxially surrounds the shaft 15 and whose lower opening 26a opens out above the center of the plate 23 serves to feed the material to be viewed onto the plate 23.

Mit Abstand gegenüber dem Umfang des Tellers 23 ist ein Ablenkring 27 vorgesehen, der das vom Teller 23 abgeworfene Sichtgut nach unten in den Sichtraum 2 umlenkt.A deflection ring 27 is provided at a distance from the circumference of the plate 23, which deflects the visible material thrown off the plate 23 downward into the viewing space 2.

Im unteren Bereich ist das Sichtergehäuse mit einem Trichter 28 zur Abführung des Grobgutes versehen. Weiterhin befindet sich unterhalb der offenen unteren Stirnseite des Rotors 13 ein weiterer Trichter 29, an den beim dargestellten Ausführungsbeispiel mehrere Anschlüsse 30 (beispielsweise vier gleichmäßig am Umfang verteilte Anschlüsse 30) angeschlossen sind.In the lower area, the classifier housing is provided with a funnel 28 for removing the coarse material. Furthermore, there is a further funnel 29 below the open lower end face of the rotor 13, to which a plurality of connections 30 (for example four connections 30 evenly distributed around the circumference) are connected in the exemplary embodiment shown.

Am austrittseitigen Ende der Spirale 1 zur Zuführung der Sichtluft sind Luftleitelemente 31 vorgesehen. Wie Fig.2 zeigt, sind diese Luftleitelemente 31 im Sinne der Strömungsrichtung der etwa tangential in den Sichtraum 2 einströmenden Sichtluft geneigt.Air guiding elements 31 are provided at the outlet end of the spiral 1 for supplying the classifying air. As FIG. 2 shows, these air guide elements 31 are inclined in the sense of the flow direction of the viewing air flowing approximately tangentially into the viewing space 2.

Die Funktion des dargestellten Sichters ist folgendermaßen:
Das über die Luftförderrinne 25 und die Verteilerglocke 26 in gleichmäßiger Verteilung auf das Zentrum des Tellers 23 aufgegebene Sichtgut wird durch die Bewegung des Rotors 13 nach außen gefördert und hierbei durch die Verteilerleisten 24 zusätzlich vergleichmäßigt. Das Sichtgut wird mit mäßiger radialer Geschwindigkeitskomponente vom Teller 23 abgeworfen und durch den Ablenkring 27 nach unten umgelenkt. Es durchsetzt dann in Form eines gleichmäßigen Gutschleiers den Sichtraum 2 von oben nach unten.The function of the sifter shown is as follows:
The visible material that is fed in via the air conveyor trough 25 and the distributor bell 26 in a uniform distribution to the center of the plate 23 is conveyed outwards by the movement of the rotor 13 and is additionally evened out by the distributor strips 24. The visible material is thrown off the plate 23 with a moderate radial speed component and deflected downward by the deflection ring 27. It then penetrates the view space 2 from top to bottom in the form of a uniform good veil.

Die Sichtluft wird über die Kanäle 5, 6 und 7 der Spirale 1 zugeführt, wobei durch Einstellung der Klappen 8, 9 und 10 die Menge der in den einzelnen Höhenbereichen des Sichtraumes 2 einströmenden Sichtluft den jeweiligen Verhältnissen optimal angepaßt wird. Da im allgemeinen im oberen Bereich des Sichtraumes 2 eine größere Gutbeladung vorhanden ist, ist es meist zweckmäßig, den oberen Kanal 5 mit einer größeren Luftmenge als den unteren Kanal 7 zu betreiben.The classifying air is supplied via channels 5, 6 and 7 to the spiral 1, the amount of classifying air flowing into the individual height areas of the classifying area 2 being optimally adapted to the respective conditions by adjusting the flaps 8, 9 and 10. Since there is generally a larger load in the upper area of the viewing space 2, it is usually expedient to operate the upper duct 5 with a larger amount of air than the lower duct 7.

Im Sichtraum 2 erfolgt die Trennung von Feingut und Grobgut. Während das Grobgut nach unten ausfällt und durch den Trichter 28 abgeführt wird, gelangt das Feingut zusammen mit der Sichtluft in das Innere des Rotors 13 und wird über die Anschlüsse 30 abgeführt. Die Luftleitelemente 31 am austrittseitigen Ende der Spirale 1 dienen zur Aufrechterhaltung des Dralles der Luftströmung, während die Rotorschaufeln 16 vorwiegend die Aufgabe erfüllen, am Feingut anhaftende Grobgutteilchen am Eintritt in das Innnere des Rotors 13 zu hindern.In the viewing room 2, the fine and coarse goods are separated. While the coarse material falls down and is discharged through the funnel 28, the fine material together with the classifying air reaches the interior of the rotor 13 and is discharged via the connections 30. The air guiding elements 31 at the outlet end the spiral 1 serve to maintain the swirl of the air flow, while the rotor blades 16 predominantly fulfill the task of preventing coarse material particles adhering to the fine material from entering the interior of the rotor 13.

Die über die Anschlüsse 30 abgeführte, mit Feingut beladene Sichtluft gelangt zu einem oder mehreren äußeren Abscheidern, in denen das Feingut (Fertiggut) von der Sichtluft getrennt wird. Die Sichtluft kann dann über einen äußeren Umluftventilator erneut der Spirale 1 zugeführt werden (Umluftbetrieb). Stattdessen ist es jedoch auch möglich, die vom Feingut befreite Sichtluft (eventuell nach weiterer Entstaubung) zu verwerfen und die Sichtluft aus der Umgebung anzusaugen (einmaliger Durchgang der Sichtluft durch den Sichter).The sifting air laden with fine material discharged via the connections 30 reaches one or more external separators in which the fine material (finished product) is separated from the sifting air. The classifying air can then be fed to the spiral 1 again via an external air circulation fan (air circulation mode). Instead, however, it is also possible to discard the fine air that has been freed from the fine material (possibly after further dedusting) and to suck in the clear air from the environment (one pass of the clear air through the classifier).

Im Rahmen der Erfindung sind verschiedene Varianten möglich. So kann man beispielsweise die mit Feingut beladene Sichtluft auch durch die obere Stirnseite des Rotors abziehen. In diesem Falle wird an der oberen Stirnseite des Rotors statt eines geschlossenen Tellers 23 zweckmäßig ein System von sternförmig angeordneten Kanälen vorgesehen, die lediglich an ihrem inneren und äußeren Ende offen sind und durch die das zentral über die Verteilerglocke 26 zugeführte Sichtgut dem Sichtraum 2 zugeleitet wird.Various variants are possible within the scope of the invention. For example, the fine air loaded with fine material can also be drawn off through the upper end of the rotor. In this case, a system of channels arranged in a star shape is expediently provided on the upper end face of the rotor instead of a closed plate 23, which are only open at their inner and outer ends and through which the visible material fed centrally via the distributor bell 26 is fed to the viewing space 2 .

Während ferner bei dem dargestellten Ausführungsbeispiel die Spirale 1 in drei übereinander angeordnete Kanäle 5, 6 und 7 unterteilt ist, so ist es im Rahmen der Erfindung selbstverständlich auch möglich, nur zwei oder mehr als drei Kanäle vorzusehen.Furthermore, in the illustrated embodiment, the spiral 1 in three arranged one above the other Channels 5, 6 and 7 is divided, it is of course also possible within the scope of the invention to provide only two or more than three channels.

Eine weitere Variante ist in Fig.2 gestrichelt angedeutet. Hierbei weist die Spirale 1 noch eine zweite Lufteintrittsöffnung 32 auf, die am Umfang um etwa 180° gegenüber der anderen Lufteintrittsöffnung 33 versetzt ist. Auch im Bereich dieser zweiten Lufteintrittsöffnung 32 sind Elemente (z.B. Klappen) zur Einstellung der durch die einzelnen Kanäle zugeführten Luftmenge vorgesehen. Durch solche zusätzlichen Lufteintrittsöffnungen wird die Aufrechterhaltung des Dralles begünstigt, mit dem die Sichtluft in den Sichtraum 2 eintritt.Another variant is indicated by dashed lines in FIG. Here, the spiral 1 also has a second air inlet opening 32, which is offset on the circumference by approximately 180 ° with respect to the other air inlet opening 33. Also in the area of this second air inlet opening 32, elements (e.g. flaps) are provided for setting the amount of air supplied through the individual channels. Such additional air inlet openings promote the maintenance of the swirl with which the classifying air enters the classroom 2.

Durch die erfindungsgemäße Einstellmöglichkeit wird nicht nur eine wesentliche Verbesserung der Trennschärfe des Sichters erzielt, sondern es wird auch der spezifische Luftbedarf des Sichters insgesamt verringert, was eine beachtliche Energieeinsparung ermöglicht.The setting option according to the invention not only achieves a significant improvement in the separating power of the classifier, but it also reduces the specific air requirement of the classifier overall, which enables considerable energy savings.

Claims (7)

  1. Classifier comprising
    a) a classifier housing with a spiral (1) which opens tangentially into the classifying chamber (2) and is provided with air baffle elements (31) at its outer end for the delivery of classifying air, a chamber for removal of the oversize material and at least one connection (30) for removal of the classifying air charged with fines,
    b) a rotor (13) which is rotatable about a vertical axis (14), is provided on its periphery with elements disposed with parallel axes and has an opening for the escape of the classifying air charged with fines in the region of one end face,
    c) means (25, 26, 27) for delivering the material for classifying to the upper end face of the rotor (13) and for deflecting the material for classifying which is guided outwards by the rotor, so that the material for classifying passes downwards from the top through the annular classifying chamber (2) between the stationary air baffle elements (31) and the elements of the rotor (13) which are disposed with parallel axes,
    d) as well as partitions (3, 4) by which the spiral () serving for the delivery of the classifying air is divided into at least two channels (5, 6, 7) lying one above the other, from which the classifying air flows into the classifying chamber (2) approximately tangentially at different height,
    characterised by the following features:
    e) the chamber for removal of the oversize material is constructed as a hopper (28);
    f) the elements disposed with parallel axes on the periphery of the rotor (13) are formed by groups of rotor blades (16) which are arranged one above the other and are borne by annular discs (17) which are connected via struts (18) to a bush (19) surrounding the rotor shaft (15);
    g) in the inlet region of the spiral (1), elements (valves 8, 9, 10) are provided for setting the quantity and/or the speed of the classifying air flowing in through these channels into the individual regions of the height of the classifying chamber (2).
  2. Classifier as claimed in Claim 1, characterised in that the elements for setting the quantity of air delivered through the individual channels (5, 6, 7) are formed by adjustable valves (8, 9, 10).
  3. Classifier as claimed in Claim 1, characterised in that the spiral (1) has a plurality of air inlet openings (32, 33) distributed over the periphery, and elements (8, 9, 10) for setting the quantity of air delivered through the individual channels (5, 6, 7) are provided in the region of each air inlet opening.
  4. Classifier as claimed in Claim 1, characterised in that a bell-type distributor (26) which is arranged coaxially with the drive shaft (15) of the rotor (13) and into which an air conveyor chute (25) opens is provided for the central supply of material for classifying to the upper end face of the rotor (13).
  5. Classifier as claimed in Claim 1, characterised in that the lower end face of the rotor (13) is open and at least one connection (30) for removal of the classifying air charged with fines is provided in the lower region of the classifier housing.
  6. Classifier as claimed in Claim 5, characterised in that the upper end face of the rotor (13) is formed by a plate (23) which serves for distribution of the material for classifying and has distributor strips (24) preferably arranged radially on its upper face.
  7. Classifier as claimed in Claim 1, characterised in that the shaft (15) of the rotor (13) is mounted at its lower end in a bearing (20) borne by radial struts (21).
EP87108132A 1986-07-03 1987-06-04 Air classifier Expired - Lifetime EP0250921B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3622413 1986-07-03
DE3622413A DE3622413C2 (en) 1986-07-03 1986-07-03 Classifier

Publications (3)

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EP0250921A2 EP0250921A2 (en) 1988-01-07
EP0250921A3 EP0250921A3 (en) 1989-08-30
EP0250921B1 true EP0250921B1 (en) 1995-12-27

Family

ID=6304341

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Application Number Title Priority Date Filing Date
EP87108132A Expired - Lifetime EP0250921B1 (en) 1986-07-03 1987-06-04 Air classifier

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US (1) US4792393A (en)
EP (1) EP0250921B1 (en)
DE (2) DE3622413C2 (en)
ES (1) ES2080716T3 (en)
IN (1) IN170755B (en)

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CN109821744B (en) * 2019-03-05 2021-02-19 无锡锡麦粮油装备工程有限公司 Air volume adjusting device for powder cleaner
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Also Published As

Publication number Publication date
EP0250921A3 (en) 1989-08-30
DE3751648D1 (en) 1996-02-08
ES2080716T3 (en) 1996-02-16
EP0250921A2 (en) 1988-01-07
DE3622413A1 (en) 1988-01-07
IN170755B (en) 1992-05-16
DE3622413C2 (en) 1995-08-03
US4792393A (en) 1988-12-20

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