EP0067895B1 - Centrifugal sifter - Google Patents

Centrifugal sifter Download PDF

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Publication number
EP0067895B1
EP0067895B1 EP19810104730 EP81104730A EP0067895B1 EP 0067895 B1 EP0067895 B1 EP 0067895B1 EP 19810104730 EP19810104730 EP 19810104730 EP 81104730 A EP81104730 A EP 81104730A EP 0067895 B1 EP0067895 B1 EP 0067895B1
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EP
European Patent Office
Prior art keywords
classifying
rotor
air
guide vanes
air classifier
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Expired
Application number
EP19810104730
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German (de)
French (fr)
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EP0067895A1 (en
Inventor
Ulrich Barthelmess
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Omya GmbH
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Omya GmbH
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    • 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
    • B07B11/06—Feeding or discharging arrangements
    • 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
    • B07B11/02—Arrangement of air or material conditioning accessories
    • 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
    • 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 centrifugal classifier according to the preamble of patent claim 1.
  • Such a classifier is used for classifying; H. for separating a mixture or batch of grains of different sizes and / or shapes and / or different specific weights in coarse material or coarse grain (grain size above a certain limit grain diameter) and in fine material (grain size below the limit grain size).
  • the grain mixture to be sifted is entered from above into the viewing area (annular space between the guide vane ring and the viewing rotor);
  • visible air flows from the outside through the guide vane ring into the visible space, so that the visible air describes a spiral movement: and entrains the particles in the corresponding movement paths.
  • the particles are exposed to the radially directed, opposing resistance and centrifugal forces. For a certain radial and axial air speed, there is a limit grain size for which the two forces are equal.
  • the coarser particles sooner or later reach the coarse grain outlet at the lower end of the viewing area.
  • the fine grain is entrained by the classifying air, which flows in through the channels of the classifying wheel and is sucked off by a fine material classifying air outlet which axially adjoins the interior of the classifying wheel.
  • the fine grain is finally separated or separated from the classifying air, whereupon the classifying air is re-introduced into the classifying air inlet, that is to say it can be circulated.
  • Such classifiers are primarily used to obtain fine material with the smallest possible grain size in a narrow grain size distribution; An upper grain size (limit grain size) of 2 to 4 ⁇ m is desired. This very fine grain is required in many ways, e.g. B. as a filler for plastics and car tires.
  • the coarse grain is used for other purposes or fine material is removed again after a further grinding process.
  • the invention is therefore based on the object of creating a classifier of this type with a higher fine material output, the fine material output being to be adjustable.
  • the “fine material output” is the proportion of the fine material which has been discharged, that is to say obtained, in the total of the fine material contained in the feed mixture.
  • the solution to this problem is that the classifier can be pivoted overall about a horizontal axis. In this way - depending on the inclination - the dwell time of the particle mixture in the viewing area can be adjusted according to the respective grain size and density and other influencing variables. If the dwell time is longer, a higher percentage of the fine material contained in the grain mixture is subtracted.
  • the classifying rotor is surrounded by a deflector ring at each of its two ends. These deflector rings make the flow more even and thus increase the selectivity.
  • Another training is that the individual guide vanes are displaceable in the radial direction for universal use of the classifier.
  • the guide vanes are guided in the radial direction at their two ends in the housing covers and are adjustable in the guides.
  • the radial depth of the viewing space can be optimally adjusted such that the separation zone is quite close to the outer diameter of the viewing rotor. This ensures that all fine grain gets into the area close to the rotor and is sucked in through the classifying air. If the separation zone is too far away from the classifying rotor, fine material together with the coarse material could get into the coarse material outlet.
  • the respective width or radial extent of the viewing space can hereby be optimally adapted to the respectively set inclination and thus to the dwell time.
  • the classifier according to the invention can be provided with only a single fine material class air outlet, but a special embodiment consists in that a fine material class air outlet connects to both end faces of the classifying rotor. As a result, the throughput is increased when the fine material output is increased.
  • the outlet cross-section is approximately doubled, so that despite the increased throughput there is a lower flow rate.
  • the fine material is thrown against the walls so violently that it adheres there, especially once a first fine material layer has built up. As a result, the flow conditions deteriorate continuously, which also results in a reduction in throughput.
  • a further embodiment consists in that a labyrinth seal is provided at each end of the classifying rotor, which is connected to one of the cooling chambers by a channel. This flushing prevents coarse material from entering the sighting air fine material outlets (or into the outlet).
  • a labyrinth seal in connection with an air classifier has already been described in DE-A-1757582.
  • the centrifugal force classifier has a concentric, essentially cylindrical housing 1 with a tangential sight air inlet 2, into which the sight air enters uniformly in the direction of the arrows 20 over the entire axial height.
  • a guide vane ring 9 is provided in the housing at a radial distance from the housing jacket. Again at a radial distance from the guide vane ring 9, the lamella ring 11 of the classifying rotor 10 is provided.
  • the grain mixture to be separated is entered from above into the viewing space 23 between the guide vane ring 9 and the rotor disk ring 11.
  • an annular channel 22 is provided in the upper housing wall for blowing in the grain mixture, into which a connecting piece 7 opens.
  • a funnel-shaped outlet 8 for coarse particles is provided on the opposite, that is to say the lower end of the housing.
  • an outlet 3, 4 is provided for the classifying air loaded with fine material in the form of a bent pipe section, the diameter of which corresponds approximately to the rotor inside diameter.
  • the centrifugal force classifier can be pivoted overall about a horizontal axis.
  • the pivot axis 30 extends transversely to the plane defined by the outlets 3, 4, approximately at the center between the outlets 3, 4.
  • the mounting of this pivot axis 30 can be carried out in a manner known per se.
  • the classifying air fine material outlets 3, 4 are each surrounded by a cooling chamber 17, 18, to which cooling air is supplied in each case via an exclusion 19, as a result of which fine material is prevented from being deposited in the outlets.
  • the rotor shaft 10a which is guided through the curved outlets 3, 4, is also supported on both sides in bearing brackets 5, 6.
  • the bearings are also cooled. Due to an overpressure in the cooling chambers 17, 18, no fine material can penetrate them (see arrows on the shaft bushings). It is driven by means of a V-belt pulley 12.
  • the classifying rotor 10 is opened on both end faces 13, 14 in such a way that it connects tightly to the outlets 3, 4. Between the classifying rotor and the housing there is in each case a seal 15, 16 which is designed like a face plate or a labyrinth.
  • a purge air channel 27 in each case introduces purge air from the cooling chambers 17, 18 for sealing between the viewing space 23 and the outlets 3, 4 (arrow 19 in FIG. 3).
  • Support disks 24 provided with radial passage openings are shrunk on the shaft 10a of the classifying rotor.
  • the rotor ends are each surrounded by a deflector ring 25, 26 on their outer circumference.

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  • Combined Means For Separation Of Solids (AREA)

Description

Die Erfindung betrifft einen Zentrifugalkraftsichter gemäß dem Oberbegriff des Patentanspruchs 1.The invention relates to a centrifugal classifier according to the preamble of patent claim 1.

Ein solcher Sichter, wie er aus der DE-A-1 607 631 bereits bekannt ist, dient zum Sichten, d. h. zum Trennen eines Gemisches oder Gemenges von Körnern unterschiedlicher Größe und/oder Form und/oder unterschiedlichen spezifischen Gewichtes in Grobgut bzw. Grobkorn (Korngröße oberhalb eines bestimmten Grenzkorndurchmessers) und in Feingut (Korngröße unterhalb der Grenzkorngröße). Das zu sichtende Korngemenge wird von oben in den Sichtraum (Ringraum zwischen Leitschaufelkranz und Sichtrotor) eingegeben; gleichzeitig strömt von außen Sichtluft durch den Leitschaufelkranz in den Sichtraum, so daß die Sichtluft eine spiralige Bewegung beschreibt: und dabei die Partikel in entsprechende Bewegungsbahnen mitreißt. In dem Sichtraum werden die Partikel den radial gerichteten, einander entgegengesetzten Widerstand- und Zentrifugalkräften ausgesetzt. Für eine bestimmte radiale und axiale Luftgeschwindigkeit ergibt sich eine Grenzkorngröße, für die die beiden Kräfte gleich groß sind.Such a classifier, as is already known from DE-A-1 607 631, is used for classifying; H. for separating a mixture or batch of grains of different sizes and / or shapes and / or different specific weights in coarse material or coarse grain (grain size above a certain limit grain diameter) and in fine material (grain size below the limit grain size). The grain mixture to be sifted is entered from above into the viewing area (annular space between the guide vane ring and the viewing rotor); At the same time, visible air flows from the outside through the guide vane ring into the visible space, so that the visible air describes a spiral movement: and entrains the particles in the corresponding movement paths. In the viewing space, the particles are exposed to the radially directed, opposing resistance and centrifugal forces. For a certain radial and axial air speed, there is a limit grain size for which the two forces are equal.

Die groberen Partikel (größer als Grenzkorn) gelangen dabei früher oder später zum Grobkornauslaß am unteren Ende des Sichtraumes. Das Feinkorn dagegen wird von der Sichtluft mitgerissen, die durch die Kanäle des Sichtrades hindurch nach innen strömt und von einem axial an den Innenraum des Sichtrades anschließenden Feingut-Sichtluft-Auslaß abgesaugt wird. Das Feinkorn wird schließlich von der Sichtluft abgetrennt oder abgeschieden, worauf die Sichtluft erneut in den Sichtlufteinlaß eingegeben, also im Kreislauf geführt werden kann. Derartige Sichter dienen in erster Linie zur Gewinnung von Feingut mit möglichst geringer Korngröße in enger Korngrößenverteilung; erstrebt wird eine obere Korngröße (Grenzkorngröße) von 2 bis 4,um. Dieses sehr feine Korn wird vielfältig benötigt, z. B. als Füllstoff für Kunststoffe und Autoreifen. Das Grobkorn wird für andere Zwecke verwendet oder aber es wird nach einem weiteren Mahlvorgang wiederum Feingut abgezogen.The coarser particles (larger than boundary grain) sooner or later reach the coarse grain outlet at the lower end of the viewing area. The fine grain, on the other hand, is entrained by the classifying air, which flows in through the channels of the classifying wheel and is sucked off by a fine material classifying air outlet which axially adjoins the interior of the classifying wheel. The fine grain is finally separated or separated from the classifying air, whereupon the classifying air is re-introduced into the classifying air inlet, that is to say it can be circulated. Such classifiers are primarily used to obtain fine material with the smallest possible grain size in a narrow grain size distribution; An upper grain size (limit grain size) of 2 to 4 μm is desired. This very fine grain is required in many ways, e.g. B. as a filler for plastics and car tires. The coarse grain is used for other purposes or fine material is removed again after a further grinding process.

Für ein wirtschaftliches Arbeiten ist es also sehr wichtig, daß möglichst sämtliches in dem aufgegebenen Korngemenge enthaltenes Feingut beim Durchgang durch den Sichter abgeschieden wird, und zwar bei relativ großer Durchsatzleistung.It is therefore very important for economical work that as much as possible all the fine material contained in the batch of grain is separated out when it passes through the classifier, with a relatively high throughput.

Der Erfingdung liegt daher die Aufgabe zugrunde, einen Sichter dieser Art mit höherer Feingutausbringung zu schaffen, wobei die Feingutausbringung einstellbar sein soll. (Die "Feingutausbringung" ist der Anteil des ausgebrachten, also gewonnenen Feingutes an dem insgesamt in dem aufgegebenen Mischgut enthaltenen Feingut.) Die Lösung dieser Aufgabe besteht gemäß der Erfindung darin, daß der Sichter insgesamt um eine horizontale Achse schwenkbar ist. Auf dieser Weise kann - je nach der Schrägstellung - die Verweilzeit des Partikelgemisches in dem Sichtraum eingestellt werden, entsprechend der jeweiligen Korngröße und der Dichte und anderer Einflußgrößen. Bei größerer Verweilzeit wird ein höherer Prozentsatz des in dem Korngemenge enthaltenen Feingutes abgezogen. Femer fallen insbesondere gröbere Partikel der Schwerkraft folgend auf den geneigten Sichtrotor, werden von diesem fortgeschleudert und prallen auf die Leitschaufeln auf. Hierdurch wird neben einem Zerkleinerungseffekt vor allem eine Desagglomeration erreicht, d. h. an Grobkorn anhaftendes Feinkorn wird von dem Grobkorn losgetrennt; dieses Feinkorn wird also mit durch den Sichtrotor hindurch abgezogen ung geht nicht mit dem Grobkorn "verloren". In weiterer Ausgestalltung ist der Sichtrotor an seinen beiden Skirnenden von je einem Abweiserring umgeben. Diese Abweiserringe bewirken eine Vergleichmäßigung der Strömung und damit eine Erhöhung der Trennschärfe. Eine weitere Ausbildung besteht darin, daß für eine universale Verwendbarkeit des Sichters die einzelnen Leitschaufeln in radialer Richtung verschieblich sind. Die Leitschaufeln sind hierzu an ihren beiden Enden in den Gehäusedeckeln in radialer Richtung geführt und in den Führungen einstellbar. Auf diese Weise kann also die radiale Tiefe des Sichtraumes optimal eingestellt werden, derart, daß die Trennzone ziemlich nahe an dem Außendurchmesser des Sichtrotors liegt. Hierdurch ist dafür gesorgt, daß alles Feinkorn in den rotornahen Bereich gelangt und durch die Sichtluft nach innen abgesaugt wird. Bei einer zu weit von Sichtrotor entfernt liegenden Trennzone könnte nämlich Feingut mit dem Grobgut zusammen in den Grobgutauslaß gelangen. Insbesondere kann hierdurch die jeweilige Breite bzw. radiale Erstreckung des Sichtraumes optimal angepaßt werden an die jeweils eingestellte Schrägstellung und damit an die Verweilzeit.The invention is therefore based on the object of creating a classifier of this type with a higher fine material output, the fine material output being to be adjustable. (The “fine material output” is the proportion of the fine material which has been discharged, that is to say obtained, in the total of the fine material contained in the feed mixture.) According to the invention, the solution to this problem is that the classifier can be pivoted overall about a horizontal axis. In this way - depending on the inclination - the dwell time of the particle mixture in the viewing area can be adjusted according to the respective grain size and density and other influencing variables. If the dwell time is longer, a higher percentage of the fine material contained in the grain mixture is subtracted. In addition, coarser particles in particular fall onto the inclined viewing rotor following gravity, are thrown away by the latter and hit the guide vanes. As a result, in addition to a crushing effect, a deagglomeration is achieved in particular. H. fine grain adhering to coarse grain is separated from the coarse grain; this fine grain is thus drawn off through the classifying rotor and is not "lost" with the coarse grain. In a further embodiment, the classifying rotor is surrounded by a deflector ring at each of its two ends. These deflector rings make the flow more even and thus increase the selectivity. Another training is that the individual guide vanes are displaceable in the radial direction for universal use of the classifier. For this purpose, the guide vanes are guided in the radial direction at their two ends in the housing covers and are adjustable in the guides. In this way, the radial depth of the viewing space can be optimally adjusted such that the separation zone is quite close to the outer diameter of the viewing rotor. This ensures that all fine grain gets into the area close to the rotor and is sucked in through the classifying air. If the separation zone is too far away from the classifying rotor, fine material together with the coarse material could get into the coarse material outlet. In particular, the respective width or radial extent of the viewing space can hereby be optimally adapted to the respectively set inclination and thus to the dwell time.

Der erfindungsgemäße Sichter kann mit nur einem einzigen Feingut-Sichtluft-Auslaß versehen sein, eine besondere Ausgestaltung besteht aber darin, daß sich an beiden Stirnseiten des Sichtrotors je ein Feingut-Sichtluft-Auslaß anschließt. Hierdurch wird bei Erhöhung des Feingutausbringens gleichzeitig die Durchsatzleistung vergrößert.The classifier according to the invention can be provided with only a single fine material class air outlet, but a special embodiment consists in that a fine material class air outlet connects to both end faces of the classifying rotor. As a result, the throughput is increased when the fine material output is increased.

Dank der beidseitigen Feingut-Sichtluft-Auslässe wird der Auslaß-Querschnitt etwa verdoppelt, so daß sich trotz erhöhter Durchsatzleistung eine kleinere Strömungsgeschwindigkeit ergibt. Bei den bisherigen höheren Strömungsgeschwindigkeiten dagegen wird das Feingut so heftig gegen die Wandungen geschleudert, daß es dort haftet, insbesondere, wenn sich erst einmal eine erste Feingutschicht angesetzt hat. Damit verschlechtern sich die Strömungsverhältnisse fortlaufend, was auch eine Verkleinerung der Durchsatzleistung zur Folge hat.Thanks to the double-sided fine material-visible air outlets, the outlet cross-section is approximately doubled, so that despite the increased throughput there is a lower flow rate. At the previous higher flow velocities, on the other hand, the fine material is thrown against the walls so violently that it adheres there, especially once a first fine material layer has built up. As a result, the flow conditions deteriorate continuously, which also results in a reduction in throughput.

Vor allem aber platzen von Zeit zu Zeit Teile dieser sich lagenweise aufbauenden Ansätze (sogenannte "Eggshells") ab und gelangen so in das Feingut, wodurch dieses unbrauchbar wird oder was jedenfalls zu großen Schwierigkeiten führt. Man hat daher zur Vermeidung dieser Ansätze (Eggshells) die Strömungsgeschwindigkeit begrenzt, damit ist aber auch die Durchsatzleistung begrenzt.Above all, however, parts of these layered approaches (so-called "egg shells") burst from time to time and get into the fines, which makes them unusable or which in any case leads to great difficulties. To avoid these approaches (eggshells), the flow velocity has therefore been limited, but this also limits the throughput.

Gemäß einer Weiterbildung wird ein solches Ansetzen von Feingut dadurch verhindert, daß die beiden Feingut-Sichtluft-Auslässe im rotornahen Bereich von je einer Kühlkammer umgeben sind. Kühlere Partikel haften weniger leicht an einer gekühlten Oberfläche, Hierbei sind vorteilhaft die Lager der beidseitig gelagerten Sichtrotorwelle in je einer Kühlkammer angeordnet; die Lager werden also gleichzeitig gekühlt, was der Betriebssicherheit und einer langen Lebensdauer der Maschine zugute kommt. Ein Windsichter mit einem Strömungskanal für einen Kühlluftstrom gehtbereits aus der DE-A-1918573 hervor.According to a development of such an attachment of fine ut g is prevented by the two fine material and classifying air outlets are surrounded in the region close to the rotor by a respective cooling chamber. Cooler particles adhere less easily to a cooled surface. In this case, the bearings of the classifying rotor shaft mounted on both sides are advantageously arranged in one cooling chamber each; the bearings are cooled at the same time, which benefits operational safety and a long service life of the machine. A wind sifter with a flow channel for a cooling air flow is already apparent from DE-A-1918573.

Eine weitere Ausgestaltung besteht darin, daß an den Stirnenden des Sichtrotors je eine Labyrinthdichtung vorgesehen ist, die durch je einen Kanal mit je einer der Kühlkammern in Verbindung steht. Durch diese Spülung wird verhindert, daß Grobgut aus dem Sichtraum in die Sichtluft-Feingut-Auslässe (bzw. in den Auslaß) gelangt. Eine Labyrinthdichtung in Verbindung mit einem Windsichter ist bereits in der DE-A-1757582 beschrieben.A further embodiment consists in that a labyrinth seal is provided at each end of the classifying rotor, which is connected to one of the cooling chambers by a channel. This flushing prevents coarse material from entering the sighting air fine material outlets (or into the outlet). A labyrinth seal in connection with an air classifier has already been described in DE-A-1757582.

Zur näheren Erläuterung wird nachfolgend ein Ausführungsbeispiel anhand der Zeichnung beschrieben Es zeigt:

  • Fig. 1 einen erfindungsgemäßen Sichter im Längsschnitt;
  • Fig. 2 den Sichter von oben, links im Querschnitt und rechts in Draufsicht;
  • Fig. 3 die Einzelheit 111 in Fig. 1, nämlich die Labyrinthdichtung mit Spülluftzufuhr aus der Kühlkammer.
For a more detailed explanation, an embodiment is described below with reference to the drawing.
  • Figure 1 shows a classifier according to the invention in longitudinal section.
  • 2 shows the classifier from above, on the left in cross section and on the right in plan view;
  • Fig. 3 shows the detail 111 in Fig. 1, namely the labyrinth seal with purge air supply from the cooling chamber.

Der Zentrifugalkraftsichter weist ein konzentrisches, im wesentlichen zylindrisches Gehäuse 1 mit einem tangentialen Sichtlufteinlaß 2 auf, in den die Sichtluft in Richtung der Pfeile 20 über die ganze axiale Höhe gleichmäßig eintritt.The centrifugal force classifier has a concentric, essentially cylindrical housing 1 with a tangential sight air inlet 2, into which the sight air enters uniformly in the direction of the arrows 20 over the entire axial height.

Mit radialem Abstand von dem Gehäusemantel ist ein Leitschaufelkranz 9 in dem Gehäuse vorgesehen. Wiederum mit radialem Abstand von dem Leitschaufelkranz 9 ist der Lamellenkranz 11 des Sichtrotors 10 vorgesehen. In den Sichtraum 23 zwischen Leitschaufelkranz 9 und Rotorlamellenkranz 11 wird von oben das zu trennende Korngemenge eingegeben. Und zwar ist in der oberen Gehäusewand ein Ringkanal 22 zum Einblasen des Korngemenges vorgesehen, in den ein Anschlußstutzen 7 einmündet. An der gegenüberliegenden, also unteren Gehäusestirnseite ist ein trichterförmiger Auslaß 8 für Grobkorn vorgesehen.A guide vane ring 9 is provided in the housing at a radial distance from the housing jacket. Again at a radial distance from the guide vane ring 9, the lamella ring 11 of the classifying rotor 10 is provided. The grain mixture to be separated is entered from above into the viewing space 23 between the guide vane ring 9 and the rotor disk ring 11. In fact, an annular channel 22 is provided in the upper housing wall for blowing in the grain mixture, into which a connecting piece 7 opens. A funnel-shaped outlet 8 for coarse particles is provided on the opposite, that is to say the lower end of the housing.

An beiden Stirnseiten des Sichtrotors sind je ein Auslaß 3, 4 für die mit Feingut beladene Sichtluft in Form eines gebogenen Rohrstückes vorgesehen, deren Durchmesser in etwa dem Rotor-Innendurchmesser entspricht. Gemäß der Erfindung ist der Zentrifugalkraftsichter insgesamt um eine horizontale Achse schwenkbar.On both end faces of the classifying rotor, an outlet 3, 4 is provided for the classifying air loaded with fine material in the form of a bent pipe section, the diameter of which corresponds approximately to the rotor inside diameter. According to the invention, the centrifugal force classifier can be pivoted overall about a horizontal axis.

Bei dem vorliegenden Ausführungsbeispiel erstreckt sich die Schwenkachse 30 quer zu der durch die Auslässe 3, 4 bestimmten Ebene, auf etwa der Mitte zwischen den Auslässen 3, 4. Im einzelnen kann die Lagerung dieser Schwenkachse 30 in an sich bekannter Weise ausgeführt sein.In the present exemplary embodiment, the pivot axis 30 extends transversely to the plane defined by the outlets 3, 4, approximately at the center between the outlets 3, 4. In particular, the mounting of this pivot axis 30 can be carried out in a manner known per se.

Die Sichtluft-Feingut-Auslässe 3, 4 sind von je einer Kühlkammer 17, 18 umgeben, denen über je einen Auschluß 19 Kühlluft zugeführt wird, wodurch ein Ansetzen von Feingut in den Auslässen verhindert wird. In den Kühlkammern 17, 18 ist auch die durch die gekrümmten Auslässe 3, 4 hindurchgeführt Rotorwelle 10a beidseits in Lagerkonsolen 5, 6 gelagert. Die Lager werden also ebenfalls gekühlt. Aufgrund eines Überdrucks in den Kühlkammern 17, 18 kann kein Feingut in diese eindringen (siehe Pfeile an den Wellendurchführungen). Der Antrieb erfolgt mittels Keilriemenscheibe 12.The classifying air fine material outlets 3, 4 are each surrounded by a cooling chamber 17, 18, to which cooling air is supplied in each case via an exclusion 19, as a result of which fine material is prevented from being deposited in the outlets. In the cooling chambers 17, 18, the rotor shaft 10a, which is guided through the curved outlets 3, 4, is also supported on both sides in bearing brackets 5, 6. The bearings are also cooled. Due to an overpressure in the cooling chambers 17, 18, no fine material can penetrate them (see arrows on the shaft bushings). It is driven by means of a V-belt pulley 12.

Der Sichtrotor 10 ist an beiden Stirnseiten 13, 14 so geöffnet, daß er dicht an die Auslässe 3, 4 anschließt. Zwischen dem Sichtrotor und dem Gehäuse befindet sich jeweils eine Dichtung 15, 16, die planscheibenartig oder labyrinthartig ausgebildet ist. Durch je einen Spülluftkanal 27 wird jeweils Spülluft aus den Kühlkammern 17, 18 zur Abdichtung zwischen Sichtraum 23 und den Auslässen 3, 4 eingeführt (Pfeil 19 in Fig. 3).The classifying rotor 10 is opened on both end faces 13, 14 in such a way that it connects tightly to the outlets 3, 4. Between the classifying rotor and the housing there is in each case a seal 15, 16 which is designed like a face plate or a labyrinth. A purge air channel 27 in each case introduces purge air from the cooling chambers 17, 18 for sealing between the viewing space 23 and the outlets 3, 4 (arrow 19 in FIG. 3).

Auf der Welle 10a des Sichtrotors sind mit radialen Durchtrittsöffnungen versehene Stützscheiben 24 aufgeschrumpft. Die Rotorenden sind an ihrem Außenumfang von je einem Abweiserring 25, 26 umgeben.Support disks 24 provided with radial passage openings are shrunk on the shaft 10a of the classifying rotor. The rotor ends are each surrounded by a deflector ring 25, 26 on their outer circumference.

Claims (6)

1. A centrifugal air classifier comprising a substantially cylindrical housing (1), which is provided with an approximately tangential inlet (2) for classifying air and which contains an annular series of guide vanes (9), which is concentric with and radially spaced from the shell of the housing, and a classifying rotor (10), which is radially inwardly spaced from said guide vanes and comprises an annular series of blades (11) defining radial passages, wherein an inlet (72) for a mixture of particles to be classified opens into the classifying space disposed between the guide vanes (9) and the classifying rotor (10), an outlet (8) for coarse particles extends out of the classifying space at the lower end thereof, an outlet (3, 4) for fines-entraining classifying air is provided at the end of the rotor and has a diameter which is approximately as large as the inside diameter of the classifying rotor (10), and the inlet (2) for classifying air and the guide vanes (9) extend approximately over the same axial length as the classifying rotor (10), characterized in that the entire air classifier is pivotally movable about a horizontal axis.
2. A centrifugal air classifier according to claim 1, characterized in that the rotor (10) is surrounded at both ends by respective deflector rings (25, 26).
3. A centrifugal air classifier according to claim 1 or 2, characterized in that the guide vanes (9) are adjustable as regards their radial spacing from the classifying tube (10).
4. A centrifugal air classifier according to any of claim 1 to 3, characterized in that two fines outlets (3, 4) are provided at respective ends of the classifying rotor.
5. A centrifugal air classifier according to any of claims 1 to 4, characterized in that the or each outlet (3, 4) for fines-entraining classifying air is surrounded by a cooling chamber (17, 18) close to the rotor.
6. A centrifugal air classifier according to claim 5, characterized in that two labyrinth glands are provided at respective ends of the classifying rotor and are connected by respective passages (27) to respective cooling air chambers (17, 18).
EP19810104730 1981-06-19 1981-06-19 Centrifugal sifter Expired EP0067895B1 (en)

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EP19810104730 EP0067895B1 (en) 1981-06-19 1981-06-19 Centrifugal sifter

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Application Number Priority Date Filing Date Title
EP19810104730 EP0067895B1 (en) 1981-06-19 1981-06-19 Centrifugal sifter

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EP0067895A1 EP0067895A1 (en) 1982-12-29
EP0067895B1 true EP0067895B1 (en) 1985-01-30

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Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3621221A1 (en) * 1986-06-25 1988-01-14 Pfeiffer Fa Christian METHOD FOR WINDPROOFING AND WINIFIFIER
DE102016121925A1 (en) * 2016-11-15 2018-05-17 Neuman & Esser Gmbh Mahl- Und Sichtsysteme Classifier, mill and method for sifting a gas-solid mixture
CN109127169A (en) * 2018-09-26 2019-01-04 天津水泥工业设计研究院有限公司 A kind of side air inlet Verticle vortex powder concentrator selects powder method and application
CN109317405B (en) * 2018-10-17 2024-02-23 浙江理工大学 Centrifugal super-optimal famous tea grader
CN111992502A (en) * 2020-08-18 2020-11-27 李彩蓉 Compromise rice sieving mechanism for rice processing of edulcoration and dust fall function
CN115350917A (en) * 2022-08-22 2022-11-18 铜陵浩凡农业科技有限公司 Rice sorting equipment and sorting method thereof

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Publication number Priority date Publication date Assignee Title
DE1229371B (en) * 1966-02-04 1966-11-24 Polysius Gmbh Air separator
DE1607631A1 (en) * 1967-07-27 1970-10-22 Krupp Gmbh Air separator
DE1757582C2 (en) * 1968-05-20 1976-03-11 The Georgia Marble Co., Atlanta, .Ga. (V.St.A.) Centrifugal basket wind sifter
DE1918573A1 (en) * 1969-04-11 1970-10-15 Polysius Ag Filter cyclone with air cooling
DE2649382A1 (en) * 1976-10-29 1978-05-11 Alpine Ag Centrifugal wind sifter with even sifting over entire length - has area of openings between suction pipe and chamber decreasing in flow direction
US4296864A (en) * 1979-07-17 1981-10-27 Onoda Cement Co., Ltd. Air classifier

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