EP0641609B1 - Wind sifter - Google Patents

Wind sifter Download PDF

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Publication number
EP0641609B1
EP0641609B1 EP94113724A EP94113724A EP0641609B1 EP 0641609 B1 EP0641609 B1 EP 0641609B1 EP 94113724 A EP94113724 A EP 94113724A EP 94113724 A EP94113724 A EP 94113724A EP 0641609 B1 EP0641609 B1 EP 0641609B1
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EP
European Patent Office
Prior art keywords
ring
inlet
guide vanes
casing
vanes
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EP94113724A
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German (de)
French (fr)
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EP0641609A2 (en
EP0641609A3 (en
Inventor
Roland Dr.-Ing. Nied
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B07SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07BSEPARATING 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
    • B07B7/00Selective separation of solid materials carried by, or dispersed in, gas currents
    • B07B7/08Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force
    • B07B7/083Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force generated by rotating vanes, discs, drums, or brushes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B07SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07BSEPARATING 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
    • B07B11/00Arrangement of accessories in apparatus for separating solids from solids using gas currents
    • B07B11/06Feeding or discharging arrangements

Definitions

  • the present invention is based on an air classifier with features such as windsifters according to WO 93/09883 by the same applicant and DE-OS 2426 295.
  • this classifier housing has a tangential air inlet and one to the Visual air inlet parallel visual material inlet and a axial fine material outlet.
  • the fines outlet is radial upstream flow through the sight wheel, from which the fine air mixed with fine material emerges axially and through the classifier outlet from the classifier housing led out and fed to a filter, for example becomes.
  • the coarse material After the tangential entry into the classifier housing rotates the visible material around the axis of the classifying wheel a spiral, the coarse material reaches the radially outside lying area of the spiral flow, is from the mixture separated from visible air and fines and passes through a coarse material outlet from the classifier housing.
  • the visual air reaches the tangential one Entry into the classifier housing first into the flow channels a guide vane ring with adjustable blades, before mixing with the visible material.
  • the two guide vane rings are by one completely different tasks completely different.
  • the blade ring is the actual means of sighting, i.e. the raw gas flow is broken down in the blade ring, of the "visible goods", in the proportion of fine goods on the one hand and in the coarse part on the other hand.
  • the sight wheel is so far only an additional component from the Consideration that when sighting alone in the blade ring the fine material may be contaminated by pointed grains, after collision with other grains or Bounce off the coarse material discharge.
  • the classifying wheel this should be pointed grains at the entrance to the fines discharge prevent why the classifying wheel at a separation limit is operated above the coarsest, with the Spiral air classifier, i.e. the fixed blade ring adjustable separation limit.
  • an additional rotating blade ring The component is a special function in the form of capturing spray grain is in the second
  • An additional air classifier is installed in the stationary guide vane ring Component with a special function, which consists in that the sight air on the entire circumference of the sight wheel the same conditions as possible, which is why the Shoveling the stationary vane ring in this way trained, arranged and adjustable that by Adjustment of the blades of the stationary guide vane ring in the annular space between the guide vane ring and classifying wheel a spiral wind sighting can be achieved, the one coarser separating grain than that on the outer edges conditions of the blades of the classifying wheel corresponds.
  • Catching the spray grain in one is a change in the malfunction conditions at the entrance of the blade channels of the classifying wheel in the other Case opposite.
  • both of the aforementioned air classifiers are distinguished by a different one Training of the coarse material discharge.
  • a peeling of a radially outer one with Coarse material enriched visual air content with a cutting edge in the case of the classifier according to DE-OS 2426295, however the coarse material discharge with one downstream of the cutting edge Snail causes, in the case of the classifier according to the WO 93/09883, however, with a purposefully arranged Baffle. Baffle. And especially snail additional components that are not only higher costs and additional weight, but also wear are exposed. Recognizing this fact the task of the present invention is one Air classifier with features according to the one dealt with above State of the art and according to the generic term of Form Claim 1 so that for the discharge of the coarse material neither a guide plate nor a screw is required is.
  • the claim 2 contains features with which the invention is more expedient Way can be trained.
  • an air classifier according to WO 93/09883 is taken as a basis, in which a classifying wheel is actual
  • the sight is a guide vane ring and the sight wheel upstream, which ensures that on the whole Extent of the sight wheel for the sight air equal inflow conditions present;
  • the blades of the classifying wheel should be arranged and designed in such a way that by adjusting the vanes of the vane ring in the annulus between the vane ring and as a classifying wheel effective paddlewheel effect a spiral wind sighting leaves, which provides a coarser separation grain than it on the outer edges of the paddle wheel, which acts as a classifying wheel prevailing conditions.
  • Such a classifier is for the invention preferably a training course, but it can be Sifter training according to DE-OS 2426295 also used as a basis become a fixed one with the actual visual element Guide vane ring and this is ultimately a classifying wheel is downstream, in order to capture spray grain, the paddle wheel sifter that is operated at a separation limit which is above the coarsest, adjustable with the spiral wind sifter Separation limit is.
  • the viewing chamber 9 is enclosed by a stationary one Guide vane ring 11.
  • the guide vanes 12 of the guide vane ring 11 are individually about their respective longitudinal axes 13 adjustable.
  • the guide vane ring 11 forms one Part of a concentric to the classifier axis 6 Circle.
  • the blades 15 In the viewing chamber enclosed by the guide vane ring 11 9, again concentric to the classifier axis 6 arranged rotating sight wheel 14 known per se, the blades 15.
  • the annulus between the Outer circle of the classifying wheel 14 and the inner circle of the Guide vane ring 11 is relatively narrow because in it no sighting should take place.
  • the width of the annulus between the sight wheel and the vane ring is only chosen as is with respect to an orderly transition of the raw material from visible material and visible air, the latter from the guide vane ring, required in the classifying wheel is.
  • the viewing material inlet 3 opens tangentially into the viewing chamber 9 in the area of the annular space between the guide vane ring 11 and the classifying wheel 14.
  • the classifying air inlet 5 opens out tangentially into the annular space 17 between the guide vane ring 11 and the spiral in the illustration of FIG. 1 Casing.
  • Visual goods inlet 3 and visual air inlet 5 are tubes arranged parallel to each other.
  • the coarse material discharge is a tube which in the illustration of FIG.
  • the classifying air flows between the flow channels the guide vanes 12 of the guide vane ring 11 from outside inside.
  • the guide vanes 12 lie on one given by the housing screw contour and are in Housing 1 rotatably mounted so that both the inflow angle of the sight gas as well as the gap width flowed through can be varied between the blades 12.
  • the Visible material is on the inside of the guide vanes 12 of the vane ring 11 abandoned and at the columns through which the sight gas flows intensely. Because of the Blade position and shape caused prevailing Flow conditions arise in the flow channels between the blades of the vane ring 1 Vortex formation, which is the setting of visible material prevented the guide vanes and finally provides a spatial spiral or Screw flow.
  • the concentric arranged in the viewing space 9 14 with the blades 15 are the same physical Connections, here are the radial and peripheral speeds but not from the gas flow and Blade position influenced, but by the gas flow and the speed of the sight wheel 14. So that the sight wheel 14 is predominantly determining the fineness, the separation limit coarser in the annular space than on the classifying wheel 14 set.
  • the outer guide vane ring 11 serves at most one relatively low caution, but above all the intensive dispersion and deagglomeration of the Visible good. The actual sighting is done with good Efficiency in classifying wheel.
  • the fine material finally leaves the classifier via the Fine material outlet 7 of the classifying wheel 14; Grit, which revolves near the guide vane ring 11 is preferred discharged from the viewing area via the coarse discharge 8.
  • Grit which revolves near the guide vane ring 11 is preferred discharged from the viewing area via the coarse discharge 8.
  • the guide vanes 12 of the outer, static guide vane ring 11 are set so that the flow angle of the guide vanes 12 and the cross sections of the guide vane channels between the vanes in the annular Visible space 9 between the guide vane ring 11 and the Paddle vision wheel 14 result in a spiral wind sighting, which provides a coarser grain of separation than the other Conditions prevailing outside edge of the bucket visible wheel corresponds.
  • the operation of the classifier on the visible material acting forces are indicated by arrows in FIG. 1.

Description

Die vorliegende Erfindung geht von einem Windsichter mit Merkmalen aus, wie sie auch Windsichter nach WO 93/09883 desselben Anmelders und DE-OS 2426 295 aufweisen. In beiden Fällen und im Fall der vorliegenden Erfindung ist das Sichtergehäuse spiralförmig, hat dieses Sichtergehäuse einen tangentialen Sichtlufteinlaß und einen zu dem Sichtlufteinlaß parallelen Sichtguteinlaß sowie einen axialen Feingutauslaß. Dem Feingutauslaß ist ein radial von außen nach innen durchströmtes Sichtrad vorgeschaltet, aus dem die mit Feingut versetzte Sichtluft axial austritt und durch den Sichtgutauslaß aus dem Sichtergehäuse herausgeführt und beispielsweise einem Filter zugeführt wird. Nach dem tangentialen Eintritt in das Sichtergehäuse rotiert das Sichtgut um die Achse des Sichtrades auf einer Spirale, das Grobgut gelangt in den radial außen liegenden Bereich der Spiralströmung, wird vom Gemisch aus Sichtluft und Feingut abgetrennt und gelangt durch einen Grobgutauslaß aus dem Sichtergehäuse heraus.The present invention is based on an air classifier with features such as windsifters according to WO 93/09883 by the same applicant and DE-OS 2426 295. In both cases and in the case of the present invention if the classifier housing is spiral, this classifier housing has a tangential air inlet and one to the Visual air inlet parallel visual material inlet and a axial fine material outlet. The fines outlet is radial upstream flow through the sight wheel, from which the fine air mixed with fine material emerges axially and through the classifier outlet from the classifier housing led out and fed to a filter, for example becomes. After the tangential entry into the classifier housing rotates the visible material around the axis of the classifying wheel a spiral, the coarse material reaches the radially outside lying area of the spiral flow, is from the mixture separated from visible air and fines and passes through a coarse material outlet from the classifier housing.

In beiden Fällen gelangt die Sichtluft nach dem tangentialen Eintritt in das Sichtergehäuse zunächst in die Strömungskanäle eines Leitschaufelkranzes mit einstellbaren Schaufeln, ehe die Vermischung mit dem Sichtgut erfolgt. Bei Baugleichheit insoweit sind die beiden Leitschaufelkränze durch eine völlig verschiedene Aufgabenstellung völlig verschieden. Im Falle des Windsichters nach der DE-OS 24 26 295 ist der Schaufelkranz das eigentliche Mittel zur Sichtung, d.h. im Schaufelkranz erfolgt die Zerlegung des Rohgasstromes, des "Sichtgutes", in den Feingutanteil einerseits und in den Grobgutanteil andererseits. Das Sichtrad ist insoweit lediglich ein zusätzliches Bauteil aus der Überleguung heraus, daß bei Sichtung allein im Schaufelkranz das Feingut durch Spitzkörner verunreinigt sein kann, die nach dem Zusammenprall mit anderen Körnern oder Abprallen vom Grobgutaustrag entstehen. Das Sichtrad soll diese Spitzkörner am Eintritt in den Feingutaustrag hindern, weshalb das Sichtrad bei einer Trenngrenze betrieben wird, die oberhalb der gröbsten, mit dem Spiralwindsichter, also dem feststehenden Schaufelkranz einstellbaren Trenngrenze liegt.In both cases the visual air reaches the tangential one Entry into the classifier housing first into the flow channels a guide vane ring with adjustable blades, before mixing with the visible material. With identical construction in this respect, the two guide vane rings are by one completely different tasks completely different. In the case of the air classifier according to DE-OS 24 26 295 the blade ring is the actual means of sighting, i.e. the raw gas flow is broken down in the blade ring, of the "visible goods", in the proportion of fine goods on the one hand and in the coarse part on the other hand. The sight wheel is so far only an additional component from the Consideration that when sighting alone in the blade ring the fine material may be contaminated by pointed grains, after collision with other grains or Bounce off the coarse material discharge. The classifying wheel this should be pointed grains at the entrance to the fines discharge prevent why the classifying wheel at a separation limit is operated above the coarsest, with the Spiral air classifier, i.e. the fixed blade ring adjustable separation limit.

Fundamental anders sind die Verhältnisse beim Windsichter nach WO 93/09883. Bei dem dortigen Windsichter erfolgt die Sichtung im Sichtrad. Wo beim oben zuerst behandelten Windsichter die Trennung in Fein- und Grobgut im stationären Schaufelkranz erfolgt, erfolgt beim Windsichter gemäß WO 93/09883 die Trennung in Fein- und Grobgut im Sichtrad, also im drehenden Schaufelkranz. Wo bei erstgenannten Windsichter ein drehender Schaufelkranz ein zusätzliches Bauelement ist, das eine Sonderfunktion in der Form des Einfangens von Spritzkorn hat, ist beim zweitgenannten Windsichter der stationäre Leitschaufelkranz ein zusätzliches Bauelement mit einer Sonderfunktion, die darin besteht, daß die Sichtluft auf dem gesamten Umfang ds Sichtrades möglichst gleiche Bedingungen vorfindet, weshalb die Schaufeln des statioären Leitschaufelkranzes derart ausgebildet, angeordnet und einstellbar sind, daß durch Einstellung der Schaufeln des stationären Leitschaufelkranzes im Ringraum zwischen Leitschaufelkranz und Sichtrad eine Spiralwindsichtung sich erwirken läßt, die ein gröberes Trennkorn liefert, als es den an den Außenkanten der Schaufeln des Sichtrades herrschenden Bedingungen entspricht. Dem Einfangen des Spritzkornes im einen Fall steht also eine Veränderung der Störmungskonditionen am Eingang der Schaufelkanäle des Sichtrades im anderen Fall gegenüber.The situation with the wind sifter is fundamentally different according to WO 93/09883. At the wind sifter there the sighting in the sight wheel. Where first dealt with above Air classifier separating fine and coarse material in stationary Blade ring is carried out according to the wind sifter WO 93/09883 the separation into fine and coarse material in the classifying wheel, so in the rotating blade ring. Where with the former Air sifter an additional rotating blade ring The component is a special function in the form of capturing spray grain is in the second An additional air classifier is installed in the stationary guide vane ring Component with a special function, which consists in that the sight air on the entire circumference of the sight wheel the same conditions as possible, which is why the Shoveling the stationary vane ring in this way trained, arranged and adjustable that by Adjustment of the blades of the stationary guide vane ring in the annular space between the guide vane ring and classifying wheel a spiral wind sighting can be achieved, the one coarser separating grain than that on the outer edges conditions of the blades of the classifying wheel corresponds. Catching the spray grain in one The case is a change in the malfunction conditions at the entrance of the blade channels of the classifying wheel in the other Case opposite.

Unabhängig von diesem grundsätzlichen Unterschied unterscheiden sich beide vorbenannten Windsichter durch eine unterschiedliche Ausbildung des Grobgutaustrages. In beiden Fällen erfolgt zwar ein Abschälen eines radial außen liegenden, mit Grobgut angereicherten Sichtluftanteiles mit einer Schneide, im Fall des Sichters gemäß der DE-OS 2426295 wird jedoch der Grobgutaustrag mit einer der Schneide nachgeordneten Schnecke bewirkt, im Fall des Sichters gemäß der WO 93/09883 dagegen mit einem zweckgerichtet angeordneten Leitblech. Leitblech.und insbesondere Schnecke sind zusätzliche Bauteile, die nicht nur höhere Kosten und zusätzliches Gewicht bedeuten, sondern auch dem verschleiß ausgesetzt sind. In Erkenntnis dieses Umstandes liegt der vorliegenden Erfingung die Aufgabe zugrunde, einen Windsichter mit Merkmalen gemäß dem oben abgehandelten Stand der Technik und gemäß dem Gattungsbegriff des Anspruchs 1 so auszubilden, daß zum Austrag des Grobgutes weder ein Leitblech noch eine Schnecke erforderlich ist.Distinguish regardless of this fundamental difference both of the aforementioned air classifiers are distinguished by a different one Training of the coarse material discharge. In both cases a peeling of a radially outer one with Coarse material enriched visual air content with a cutting edge, in the case of the classifier according to DE-OS 2426295, however the coarse material discharge with one downstream of the cutting edge Snail causes, in the case of the classifier according to the WO 93/09883, however, with a purposefully arranged Baffle. Baffle. And especially snail additional components that are not only higher costs and additional weight, but also wear are exposed. Recognizing this fact the task of the present invention is one Air classifier with features according to the one dealt with above State of the art and according to the generic term of Form Claim 1 so that for the discharge of the coarse material neither a guide plate nor a screw is required is.

Diese Aufgabe ist bei einem Windsichter gelöst, der die Merkmale des Anspruchs 1 aufweist. Der Anspruch 2 enthält Merkmale, mit denen die Erfindung in zweckmäßiger Weise weiter ausgebildet werden kann. This task is solved with a wind sifter that has the features of claim 1. The claim 2 contains features with which the invention is more expedient Way can be trained.

Die Erfindung wird nachfolgend anhand der Zeichnung näher erläutert, wobei ein Windsichter gemäß WO 93/09883 zugrundegelegt wird, bei dem ein Sichtrad eigentliches Sichtmittel ist und dem Sichtrad ein Leitschaufelkranz vorgeordnet ist, der dafür sorgt, daß auf dem gesamten Umfang des Sichtrades für die Sichtluft gleiche Anströmverhältnisse vorliegen; die Schaufeln des Sichtrades sollen also derart angeordnet und ausgebildet sein, daß durch Einstellung der Schaufeln des Leitschaufelkranzes im Ringraum zwischen Leitschaufelkranz und als Sichtrad wirkendem Schaufelrad eine Spiralwindsichtung sich erwirken läßt, die ein gröberes Trennkorn liefert, als es den an den Außenkanten des als Sichtrad wirkenden Schaufelrades herrschenden Bedingungen entspricht.The invention is described below with reference to the drawing explained in more detail, wherein an air classifier according to WO 93/09883 is taken as a basis, in which a classifying wheel is actual The sight is a guide vane ring and the sight wheel upstream, which ensures that on the whole Extent of the sight wheel for the sight air equal inflow conditions present; the blades of the classifying wheel should be arranged and designed in such a way that by adjusting the vanes of the vane ring in the annulus between the vane ring and as a classifying wheel effective paddlewheel effect a spiral wind sighting leaves, which provides a coarser separation grain than it on the outer edges of the paddle wheel, which acts as a classifying wheel prevailing conditions.

Eine solche Sichterausbildung ist für die Erfindung zwar eine vorzugsweise Ausbildung, es kann jedoch eine Sichterausbildung gemäß DE-OS 2426295 auch zugrundegelegt werden, bei der eigentliches Sichtelement ein feststehender Leitschaufelkranz ist und diesem ein Sichtrad letztlich nachgeordnet ist, um Spritzkorn einzufangen, der Schaufelradsichter also bei einer Trenngrenze betrieben wird, welche oberhalb der gröbsten, mit dem Spiralwindsichter einstellbaren Trenngrenze liegt.Such a classifier is for the invention preferably a training course, but it can be Sifter training according to DE-OS 2426295 also used as a basis become a fixed one with the actual visual element Guide vane ring and this is ultimately a classifying wheel is downstream, in order to capture spray grain, the paddle wheel sifter that is operated at a separation limit which is above the coarsest, adjustable with the spiral wind sifter Separation limit is.

In der Zeichnung zeigen

Figur 1
einen vertikalen Mittellängsschnitt durch einen erfindungsgemäß ausgebildeten und arbeitenden Windsichter, der in dieser Darstellung dem Windsichter gemäß WO 93/09883 gleicht und
Figur 2
eine Ansicht auf das Sichtergehäuse in Richtung des Pfeiles A in Figur 1 sowie
Figur 3
einen Schnitt nach der Linie III - III in Figur 1,
wobei für Fig. 1 darauf hinzuweisen ist, daß der Sichter auch liegend angeordnet sein kann, somit Fig. 1 ein horizontaler Mittellängsschnitt ist.Show in the drawing
Figure 1
a vertical central longitudinal section through an air classifier designed and working according to the invention, which in this illustration is similar to the air classifier according to WO 93/09883 and
Figure 2
a view of the classifier housing in the direction of arrow A in Figure 1 and
Figure 3
2 shows a section along the line III-III in FIG. 1,
1 for the fact that the classifier can also be arranged horizontally, thus FIG. 1 is a horizontal central longitudinal section.

Die Sichtkammer 9 ist umschlossen von einem ortsfesten Leitschaufelkranz 11. Die Leitschaufeln 12 des Leitschaufelkranzes 11 sind einzeln um ihre jeweilige Längsachse 13 einstellbar. Der Leitschaufelkranz 11 bildet einen Teil eines konzentrisch zur Sichterachse 6 liegenden Kreises.The viewing chamber 9 is enclosed by a stationary one Guide vane ring 11. The guide vanes 12 of the guide vane ring 11 are individually about their respective longitudinal axes 13 adjustable. The guide vane ring 11 forms one Part of a concentric to the classifier axis 6 Circle.

In der vom Leitschaufelkranz 11 umschlossenen Sichtkammer 9 ist, wiederum konzentrisch zur Sichterachse 6 ein an sich bekanntes drehendes Sichtrad 14 angeordnet, das Schaufeln 15 aufweist. Der Ringraum zwischen dem Außenkreis des Sichtrades 14 und dem Innenkreis des Leitschaufelkranzes 11 ist relativ schmal, weil in ihm keine Sichtung stattfinden soll. Die Breite des Ringraumes zwischen Sichtrad und Leitschaufelkranz ist nur so gewählt, wie es mit Rücksicht auf einen geordneten Übertritt des Rohgutes aus Sichtgut und Sichtluft, letztere aus dem Leitschaufelkranz, in das Sichtrad erforderlich ist.In the viewing chamber enclosed by the guide vane ring 11 9, again concentric to the classifier axis 6 arranged rotating sight wheel 14 known per se, the blades 15. The annulus between the Outer circle of the classifying wheel 14 and the inner circle of the Guide vane ring 11 is relatively narrow because in it no sighting should take place. The width of the annulus between the sight wheel and the vane ring is only chosen as is with respect to an orderly transition of the raw material from visible material and visible air, the latter from the guide vane ring, required in the classifying wheel is.

Der Sichtguteinlaß 3 mündet tangential in die Sichtkammer 9 im Bereich des Ringraumes zwischen dem Leitschaufelkranz 11 und dem Sichtrad 14. Der Sichtlufteinlaß 5 mündet tangential in den Ringraum 17 zwischen dem Leitschaufelkranz 11 und dem in der Darstellung der Fig. 1 spiralförmigen Gehäuse. Sichtguteinlaß 3 und Sichtlufteinlaß 5 sind parallel zueinander geordnete Rohre. Der Grobgutaustrag ist ein Rohr, das in der Darstellung der Fig. 1 dem Sichtlufteinlaß 5 und dem Produkteinlaß 3 entgegengesetzt, also nach unten gerichtet ist, wobei die beiden Einlässe 3, 5 einerseits und der Grobgutauslaß 8 andererseits in Richtung der Sichterlängsachse bzw. der Drehachse des Sichtrades 14 um zumindest eine Schraubwindung gegeneinander versetzt sind, das Gehäuse also ein Schneckengehäuse ist, was sich aus der Darstellung der Fig. 2,3 ergibt. Aus Fig. 2 ist auch zu ersehen, daß die Beschaufelung des Sichtrades die Schaufeln des Leitschaufelkranzes 11 sowohl im Einlaßbereich 3,5 als auch im Auslaßbereich 8 weitgehend überdeckt.The viewing material inlet 3 opens tangentially into the viewing chamber 9 in the area of the annular space between the guide vane ring 11 and the classifying wheel 14. The classifying air inlet 5 opens out tangentially into the annular space 17 between the guide vane ring 11 and the spiral in the illustration of FIG. 1 Casing. Visual goods inlet 3 and visual air inlet 5 are tubes arranged parallel to each other. The coarse material discharge is a tube which in the illustration of FIG. 1 Visual air inlet 5 and the product inlet 3 opposite, So facing down, the two inlets 3, 5 on the one hand and the coarse material outlet 8 on the other in the direction of the classifier longitudinal axis or the axis of rotation of the sight wheel 14 by at least one screw turn are offset from each other, so the housing is a snail housing is what results from the representation of Fig. 2,3. From Fig. 2 it can also be seen that the blading of the classifying wheel the blades of the guide vane ring 11 both in the inlet area 3.5 and in the outlet area 8 largely covered.

Die Sichtluft durchströmt die Strömungskanäle zwischen den Leitschaufeln 12 des Leitschaufelkranzes 11 von außen nach innen. Die Leitschaufeln 12 liegen auf einer vom Gehäuse vorgegebenen Schneckenkontur und sind im Gehäuse 1 derart drehbar gelagert, daß sowohl der Einströmwinkel des Sichtgases als auch die durchströmte Spaltweite zwischen den Schaufeln 12 variiert werden können. Das Sichtgut wird an der Innenseite der Leitschaufeln 12 des Leitschaufelkranzes 11 aufgegeben und an den Spalten intensiv vom Sichtgas durchströmt. Aufgrund der von Schaufelstellung und Schaufelform verursachten, herrschenden Strömungsverhältnissen stellt sich in den Strömungskanälen zwischen den Schaufeln des Leitschaufelkranzes 1 eine Wirbelbildung ein, die das Ansetzten von Sichtgut an den Leitschaufeln verhindert und schließlich stellt sich in der Sichtkammer 9 eine räumliche Spiral - bzw. Schneckenströmung ein. The classifying air flows between the flow channels the guide vanes 12 of the guide vane ring 11 from outside inside. The guide vanes 12 lie on one given by the housing screw contour and are in Housing 1 rotatably mounted so that both the inflow angle of the sight gas as well as the gap width flowed through can be varied between the blades 12. The Visible material is on the inside of the guide vanes 12 of the vane ring 11 abandoned and at the columns through which the sight gas flows intensely. Because of the Blade position and shape caused prevailing Flow conditions arise in the flow channels between the blades of the vane ring 1 Vortex formation, which is the setting of visible material prevented the guide vanes and finally provides a spatial spiral or Screw flow.

Im konzentrisch im Sichtraum 9 angeordneten Sichtrad 14 mit den Schaufeln 15 herrschen die gleichen physikalischen Zusammenhänge, hier werden die Radial- und die Umfangsgeschwindigkeit jedoch nicht vom Gasmengenstrom und der Schaufelstellung beeinflußt, sondern vom Gasmengenstrom und der Drehzahl des Sichtrades 14. Damit das Sichtrad 14 überwiegend feinheitsbestimmend ist, wird die Trenngrenze im ringförmigen Zwischenraum gröber als am Sichtrad 14 eingestellt.In the concentric arranged in the viewing space 9 14 with the blades 15 are the same physical Connections, here are the radial and peripheral speeds but not from the gas flow and Blade position influenced, but by the gas flow and the speed of the sight wheel 14. So that the sight wheel 14 is predominantly determining the fineness, the separation limit coarser in the annular space than on the classifying wheel 14 set.

Der äußere Leitschaufelkranz 11 dient allenfalls einer verhältnismäßig geringen Vorsichtung, vor allem aber der intensiven Dispergierung und Desagglomeration des Sichtgutes. Die eigentliche Sichtung erfolgt mit gutem Wirkungsgrad im Sichtrad.The outer guide vane ring 11 serves at most one relatively low caution, but above all the intensive dispersion and deagglomeration of the Visible good. The actual sighting is done with good Efficiency in classifying wheel.

Das Feingut verläßt den Sichter schließlich über den Feingutaustritt 7 des Sichtrades 14; Streugut, welches nahe dem Leitschaufelkranz 11 umläuft, wird vorzugsweise über den Grogutaustrag 8 so aus dem Sichtraum abgeführt. Infolge der Versetzung vom Guteinlaß 3 und Sichtlufteinlaß 5 einerseits und Grob- und Streugutauslaß 8 andererseits in Achsrichtung des Gehäuses gelangt das Grobgut und ggf. Streugut an der Innenseite der Gehäusewand entlang in den Bereich des Grobgutauslasses 8, ohne daß besondere zusätzliche Einbauelemente wie ein Leitblech oder eine Austragschnecke notwendig wären. The fine material finally leaves the classifier via the Fine material outlet 7 of the classifying wheel 14; Grit, which revolves near the guide vane ring 11 is preferred discharged from the viewing area via the coarse discharge 8. As a result of the displacement from the good inlet 3 and sight air inlet 5 on the one hand and coarse and grit outlet 8 on the other in the axial direction of the housing the coarse material and, if applicable, grit on the inside of the Along the housing wall in the area of the coarse material outlet 8 without special additional installation elements such as a baffle or a discharge screw would be necessary.

In der Ansicht auf das Sichtergehäuse 1 in der durch den Pfeil A in Fig.1 gekennzeichneten Blickrichtung ist der erfindungsgemäße Windsichter in Fig.3 dargestellt. Es ist zu sehen, wie Produkt- bzw. Sichtguteinlaß 3 und Sichtlufteinlaß 5 in dieser Ansicht hintereinander liegend - einerseits und Grobgutauslaß 8 andererseits um eine Schraubenwindung gegeneinander in Richtung der Sichterachse 6 gegen einander versetzt und nach oben (Einlässe 3,5) bzw. unten (Grobgutauslaß 8) weisend dem Sichtergehäuse 1 zugeordnet sind.In the view of the classifier housing 1 in the Arrow A marked in Fig.1 is the viewing direction Air classifier according to the invention shown in Figure 3. It is to see how product or visual goods inlet 3 and visual air inlet 5 lying one behind the other in this view - on the one hand and coarse material outlet 8 on the other hand around a screw turn against each other in the direction of the classifier axis 6 against each other offset and upwards (inlets 3.5) or downwards (coarse material outlet 8) are assigned to the classifier housing 1.

Die Leitschaufeln 12 des äußeren, statischen Leitschaufelkranzes 11 werden so eingestellt, daß der Durchströmwinkel der Leitschaufeln 12 und die Querschnitte der Leitschaufelkanäle zwischen den Leitschaufeln in dem ringförmigen Sichtraum 9 zwischen dem Leitschaufelkranz 11 und dem Schaufelsichtrad 14 eine Spiralwindsichtung ergeben, die ein gröberes Trennkorn liefert als es den an der Außenkante des Schaufelsichtrades herrschenden Bedingungen entspricht. Die bei Betrieb des Sichters auf das Sichtgut wirkenden Kräfte sind in Figur 1 durch Pfeile gekennzeichnet.The guide vanes 12 of the outer, static guide vane ring 11 are set so that the flow angle of the guide vanes 12 and the cross sections of the guide vane channels between the vanes in the annular Visible space 9 between the guide vane ring 11 and the Paddle vision wheel 14 result in a spiral wind sighting, which provides a coarser grain of separation than the other Conditions prevailing outside edge of the bucket visible wheel corresponds. The operation of the classifier on the visible material acting forces are indicated by arrows in FIG. 1.

Weil im Ringraum 17 keine Sichtung erfolgen soll, kann dieser Ringraum konstante Breite haben, obwohl er in Strömungsrichtung auch schmaler werden kann.Because no sighting should take place in the annular space 17, can this annulus have constant width, although in Flow direction can also become narrower.

Claims (2)

  1. An air separator comprising a stationary casing forming a spiral in the axial direction, a ring of guide vanes disposed so as to be stationary in the casing and with adjustable vanes, a vaned separating wheel rotating round the casing axis and disposed coaxially inside the ring of guide vanes, an inlet for crude gas opening tangentially into the annular space between the separating wheel and the ring of guide vanes, an inlet for separating gas parallel to the previously-mentioned inlet and opening into the annular space between the ring of guide vanes and the spiral casing, and finally an outlet for coarse material in the end region of the flow in the annular space between the ring of guide vanes and the separating wheel, characterised in that the outlet (8) for coarse material is offset in the axial direction of the spiral casing relative to the inlet (5) for separating gas and the inlet (3) for material to be separated and consequently the spiral casing has the shape of a helix which has at least one complete turn.
  2. An air separator according to claim 1, characterised in that the separating wheel (7) is so disposed relative to the likewise helical stationary ring of guide vanes that the vanes on the separating wheel substantially completely cover the vanes of the ring of guide vanes both in the inlet region and also in the outlet region of the separator casing.
EP94113724A 1993-09-02 1994-09-01 Wind sifter Expired - Lifetime EP0641609B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4329706 1993-09-02
DE4329706A DE4329706A1 (en) 1993-09-02 1993-09-02 Air classifier

Publications (3)

Publication Number Publication Date
EP0641609A2 EP0641609A2 (en) 1995-03-08
EP0641609A3 EP0641609A3 (en) 1995-08-30
EP0641609B1 true EP0641609B1 (en) 1998-12-02

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ID=6496713

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Application Number Title Priority Date Filing Date
EP94113724A Expired - Lifetime EP0641609B1 (en) 1993-09-02 1994-09-01 Wind sifter

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US (1) US5489320A (en)
EP (1) EP0641609B1 (en)
JP (1) JP3628357B2 (en)
DE (2) DE4329706A1 (en)
ES (1) ES2126030T3 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007013029A1 (en) 2007-03-19 2008-09-25 Roland Dr. Nied Air classifier operating method and air classifier

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6140451A (en) * 1997-10-17 2000-10-31 Shin-Etsu Chemical Co., Ltd. Surface treating compositions
DE10044104C2 (en) * 2000-09-07 2003-04-10 Roland Nied air classifier
US8480876B2 (en) * 2007-12-26 2013-07-09 Theodore R. Beck Aluminum production cell
CN110560356B (en) * 2019-09-17 2021-08-10 安徽隆跃农业发展有限公司 Agricultural seed multi-stage screening device

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Publication number Priority date Publication date Assignee Title
US2591408A (en) * 1949-09-03 1952-04-01 Gen Electric Self-ventilated dynamoelectric machine having an air cleaner
US2738855A (en) * 1953-04-28 1956-03-20 Fallon John Apparatus for separating dust from gases
US2989146A (en) * 1958-06-27 1961-06-20 Claude B Schneible Co Separating apparatus
ES306036A1 (en) * 1963-12-05 1965-03-01 Polysius Gmbh Improvements in the construction of centrifugal force separators. (Machine-translation by Google Translate, not legally binding)
US3406504A (en) * 1966-12-13 1968-10-22 American Air Filter Co Combined gas moving and gas cleaning apparatus
DE3826463C2 (en) * 1988-08-04 1995-10-26 Heinz Jaeger Air classifier
DE4137633A1 (en) * 1991-11-15 1993-05-19 Nied Roland WINDSHIELD AND METHOD FOR OPERATING A WINDSHIELD

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007013029A1 (en) 2007-03-19 2008-09-25 Roland Dr. Nied Air classifier operating method and air classifier

Also Published As

Publication number Publication date
JPH07155699A (en) 1995-06-20
EP0641609A2 (en) 1995-03-08
DE4329706A1 (en) 1995-03-09
US5489320A (en) 1996-02-06
JP3628357B2 (en) 2005-03-09
EP0641609A3 (en) 1995-08-30
ES2126030T3 (en) 1999-03-16
DE59407372D1 (en) 1999-01-14

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