EP0472930A2 - Pneumatic classifier, preferably a vertical one - Google Patents

Pneumatic classifier, preferably a vertical one Download PDF

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Publication number
EP0472930A2
EP0472930A2 EP91112707A EP91112707A EP0472930A2 EP 0472930 A2 EP0472930 A2 EP 0472930A2 EP 91112707 A EP91112707 A EP 91112707A EP 91112707 A EP91112707 A EP 91112707A EP 0472930 A2 EP0472930 A2 EP 0472930A2
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EP
European Patent Office
Prior art keywords
outlet
air
classifying
classifier according
cover plate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP91112707A
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German (de)
French (fr)
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EP0472930B1 (en
EP0472930A3 (en
Inventor
Roland Dr.-Ing. Nied
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Individual
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Individual
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Filing date
Publication date
Priority claimed from DE4024440A external-priority patent/DE4024440A1/en
Priority claimed from DE4025247A external-priority patent/DE4025247A1/en
Application filed by Individual filed Critical Individual
Publication of EP0472930A2 publication Critical patent/EP0472930A2/en
Priority claimed from US07/900,310 external-priority patent/US5244481A/en
Publication of EP0472930A3 publication Critical patent/EP0472930A3/en
Application granted granted Critical
Publication of EP0472930B1 publication Critical patent/EP0472930B1/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
    • B07B11/06—Feeding or discharging arrangements

Definitions

  • the present invention relates to an air classifier with a classifying wheel.
  • the classifying wheel has two cover disks which are held at a predetermined distance from one another with the interposition of blades near the outer circumference.
  • This classifying wheel is rotatably mounted about an axis in a fixed housing.
  • the material to be sifted consists of coarser and finer dust particles that are carried in an air stream and form the product stream that is introduced into the housing. It reaches the classifying wheel in the radial direction. In it the coarser dust particles are separated from the air flow and the air flow with the fine dust particles axially leaves the sight wheel through a discharge pipe.
  • the air flow with the fine dust particles can be fed to a filter in which air and fine dust are separated from one another.
  • a general aspect of the present invention is to design such an air classifier in such a way that the flow conditions are improved in order to save energy, in order to improve the effectiveness with regard to the separation performance and in order to enable a compact construction.
  • the flow speed should be able to be changed in relation to the values to take into account special operating conditions, which inevitably occur when the two cover disks or at least their mutually facing sides or surfaces run parallel to one another, as is the case with known air classifiers.
  • the coarse particles were removed from the original raw gas stream and removed from the separator housing.
  • the remaining raw gas stream with the smaller, lighter-weight particles remaining in it flows into the air classifier according to FIG. 1 or according to FIG. 2, although these smaller, lighter-weight particles are also different with regard to their size or weight, that is to say with regard to their "mass" .
  • a classifier wheel which in turn has a first cover plate 1 on the outflow side, which is upper in the case of a vertical arrangement of the classifier, and a second cover plate 2 which is axially offset with respect thereto and in the case of a vertical arrangement of the classifier.
  • a first cover plate 1 on the outflow side which is upper in the case of a vertical arrangement of the classifier
  • a second cover plate 2 which is axially offset with respect thereto and in the case of a vertical arrangement of the classifier.
  • blades 3 are fixedly arranged on the outer circumference of the outflow-side and second cover disks 1, 2 by holding the two cover disks together, for example by bolts, and holding the blades between them.
  • Cover disks and blades form the classifying wheel rotating about its longitudinal axis 4.
  • This longitudinal axis 4 can in principle stand vertically and mark a standing classifier or it can lie horizontally and mark a lying wind classifier.
  • the outlet connection 5 is firmly connected to the outflow-side cover plate 1. It is inserted as a dip tube with section 6 into the interior of the sight wheel 1 to 3 in order to be connected in a rotationally fixed manner within the sight wheel to the cover disk 1 on the outflow side.
  • the outlet nozzle above the cover plate 1 is widened in a funnel shape; Arrows and outflows of the visual air enriched with fine dust coming from a separator are indicated by arrows 8.9.
  • the classifying wheel and the outlet port 5 assigned to the classifying wheel are arranged in a housing which consists of a pot-shaped lower part 10 and an upper cover 11.
  • the two housing parts 10, 11 lie one above the other in peripheral flanges 12, 13 and are detachably connected to one another by screw connections 14 inserted through these peripheral flanges.
  • the lower housing part 10 has a lateral bracket 15, in which the cover 11 is pivotally mounted about its longitudinal axis by means of a pin 16. To pivot the cover 11 about the longitudinal axis of the pin 16, the screw connections 14 inserted through the flanges 12, 13 are released.
  • the cover 11 is provided with a neck-shaped extension 17, in which the outlet connection 5, with an upper, cylindrical tubular section 18, is rotatably mounted about its longitudinal axis in two axially offset bearings 19, 20.
  • the outlet nozzle is connected to a vacuum source, not shown.
  • the drive torque for the compressor wheel is partially introduced at the upper end of the outlet nozzle 5, 6 or 18, for which purpose, for example, outside the upper end of the neck-shaped extension 17, which is releasably closed by a cover, a pulley 21 connected to the outlet nozzle and acting on it Drive belts 22 are shown; in part, the drive torque is also introduced via the second cover disk 2, in that a belt drive 30, 31 is assigned to a bearing bolt 24 of the cover disk 2 outside a shoulder 27 of the bearing housing part 10.
  • the belt drives 21, 22 on the one hand and 30, 31 on the other hand are matched to one another in such a way that the two cover disks 2, 3 are driven at the same speed or in a desired different speed ratio.
  • the second cover disk 2 which is lower in the case of a vertical arrangement of the air classifier, is fastened to the bearing pin 24 by means of a pin 23, which is rotatably mounted about its longitudinal axis in bearings 25, 26 in the neck-shaped extension 27 of the lower housing part 10.
  • a guide tube 32 is arranged concentrically with the rim of the blades 3 and outside of this blade rim and is held with support blades 33 in the lower housing part 10 such that it surrounds the blade rim 3 concentrically.
  • an inlet connection 34 opens radially into the lower housing part 10 directly above the housing base for introducing the classifying air.
  • an inlet connection 35 for the material opens radially into the lower housing part 10 and is conveyed into the housing by means of an inlet screw 36 arranged in the inlet connection 35.
  • the classifying air enters through the connecting piece 34, the material through the connecting piece 35 into the lower housing part 10, whereupon the classifying air enriched with good through the annular channel 37 between the guide tube 32 and the wall of the lower part 10 through a manifold 38 is supplied in the housing cover 11, in which a flow reversal takes place.
  • the well-enriched classifying air now gets into the area inside the guide tube 32 to be sucked in from there in the radial direction into the classifying wheel, where the coarse-grained material is separated off on the blades 3, so that classifying material laden with fine material enters the classifying wheel.
  • This fine air laden sight air is deflected in the sight wheel in an axial flow direction and is now sucked off through the dip tube 5.
  • the fine material is also filtered out of the air in a filter downstream of the dip tube section 18.
  • the material that is too coarse reaches the area below the second cover plate 2 along the second cover plate 2 in order to be further processed from there in a suitable manner. It becomes the classifier housing taken in a suitable place and in a suitable manner, which however should not be explained in detail because it is not part of the invention.
  • the interior of the housing 10, 11 is easily accessible and cleaning and maintenance, in particular of the classifying wheel part with the upper cover disc 1 and the blades 3 removed from the lower cover disc 2, and, if appropriate, its repair are easily possible.
  • the entire vertical air classifier is enclosed by a housing which essentially consists of the upper housing part 40 and the lower housing part 41.
  • Upper housing part 40 and lower housing part 41 are each provided with an outwardly directed peripheral flange 42 and 43 on the upper and lower edge.
  • the two flanges 42, 43 lie on one another and are fixed against one another by suitable means.
  • suitable means for fixing are, for example, screw connections. Clamps or the like can also serve as releasable fastening means.
  • both flanges are connected to one another by a joint 44 in such a way that the upper housing part 40 can be pivoted upwards in the direction of arrow 45 relative to the lower housing part 41 after the flange connection means have been released, and the upper housing part 40 from below, the lower housing part 41 is accessible from above.
  • the lower housing part 41 in turn is formed in two parts and it consists essentially of the cylindrical visible space housing 46 with the flange 43 at its upper open end and the discharge cone 47, which tapers conically downwards.
  • the discharge cone 47 and the viewing space housing 46 lie on top of one another at the upper and lower ends with flanges 48, 49 and both flanges 48, 49 of the discharge cone 47 and the viewing space housing 46 are connected to one another like the flanges 43, 44 by releasable fastening means.
  • the classifier housing assembled in this way is suspended in support arms 50, several of which are distributed as uniformly as possible over the circumference of the compressor housing and act on the cylindrical classroom housing 46.
  • An essential part of the built-in housing of the air classifier is in turn the classifying wheel with the upper cover plate 1, the lower downstream classing plate 2 axially spaced apart from this and the arranged between the outer edges of the two classing plates 1, 2, firmly connected to it and evenly distributed over the circumference of the classifying wheel Buckets 3 appropriate contour.
  • the driving of the classifying wheel is effected via the upper cover plate 1, while the lower cover plate 2 is the cover plate on the outflow side.
  • the bearing of the classifying wheel comprises an expediently positively driven shaft 51 which is led out of the classifier housing with the upper end and carries the classifying wheel in a rotationally fixed manner within the classifier housing in a rotationally fixed position.
  • the sight wheel shaft 51 is led out of the classifier housing in a pair of machined plates 52, 53, which close off the housing at the upper end of an upwardly frustoconical housing end section 54, guide the shaft and seal this shaft passage without obstructing the rotational movements of the shaft.
  • the upper plate 53 can expediently be assigned as a flange to the shaft 51 in a rotationally fixed manner and can be rotatably supported on the lower plate 52, which in turn is assigned to the housing end section 54, via rotary bearings 55.
  • the underside of the outflow-side cover plate 2 lies in the common plane between the flanges 43, 44, so that the classifying wheel is arranged in its entirety within the foldable upper housing part.
  • the upper housing part 40 also has the product feed port 56, which is a tube, the longitudinal axis of which runs parallel to the axis of rotation of the classifying wheel 11 and its drive shaft 51 and which is arranged as far out as possible.
  • the viewing space housing 46 accommodates the tubular outlet connection 57 which is arranged coaxially with the viewing wheel and which lies with its upper end just below the outflow-side cover disk 2 of the viewing wheel, but without being connected to it.
  • an outlet chamber 58 is placed in the same axis, which is also tubular, but the diameter of which is considerably larger than the diameter of the outlet connector 57, at least twice as large as the diameter of the outlet connector.
  • the outlet port is inserted into an upper cover plate 59 of the outlet chamber 58, at the bottom the outlet chamber 58 is closed by a removable cover 60.
  • outlet nozzle 57 and outlet chamber 58 is held in a plurality of support arms 61, which are distributed in a star shape evenly over the circumference of the unit, with their inner ends in the region of the outlet nozzle firmly connected to the unit and with their outer ends attached to the classifier housing.
  • the outlet connection 57 is surrounded by a conical ring housing 62, the lower, larger outer diameter of which is at least approximately that Diameter of the outlet chamber and its upper, smaller outer diameter corresponds at least approximately to the diameter of the classifying wheel.
  • the support arms 61 end on the conical wall of the ring housing 62 and are firmly connected to this wall, which in turn is part of the structural unit comprising the outlet connector 57 and the outlet chamber 58.
  • the support arms 61 and the ring housing 62 are parts of a purge air device, the purge air preventing the ingress of matter from the interior of the view space housing 46 into the gap between the view wheel or its lower cover plate 2 and outlet connection 57.
  • the support arms 61 are designed as tubes, their outer end sections are led through the wall of the classifier housing and are connected via a suction filter 63 to a purge air source.
  • the ring housing 62 is closed at the top by a perforated plate 64 and the gap itself can be adjustable by an axially adjustable ring disk in the area between the perforated plate 64 and the lower cover disk 2 of the sight wheel 1, 2, 3.
  • the outlet from the outlet chamber 58 is formed by a tube 65, which is guided into the view chamber housing 46 from the outside and is connected to the outlet chamber 58 in a tangential arrangement.
  • a deflecting cone 66 serves to clad the opening of the fine material discharge pipe 65 to the outlet chamber 58.
  • the visible air inlet spiral 67 and the coarse material discharge 68 are assigned to the partial housing 47 in a horizontal arrangement.
  • the direction of rotation of the sight air inlet spiral 67 is opposite to the direction of rotation of the sight wheel.
  • the coarse material discharge 68 is removably assigned to the partial housing 47, a flange 69 being assigned to the lower end of the partial housing 47 and a flange 70 being assigned to the upper end of the coarse material discharge 61, and both flanges are in turn releasably connected to one another by known means when the classifier is ready for operation.
  • the dispersion zone to be designed is designated 71.
  • Machined (chamfered) flanges on the inside edge for a clean flow and a simple lining are marked with 72.
  • an interchangeable protective tube 73 is placed as a wear part on the inner wall of the outlet connector 57 and a corresponding interchangeable protective tube 74 can be placed on the inner wall of the outlet chamber 58.
  • classifying air is introduced via the classifying air inlet spiral 67 into the classifier under a pressure drop and at an appropriately selected entry speed.
  • the classifying air rises spirally upwards into the region of the classifying wheel 1-3.
  • the "product" consisting of solid particles of different masses is fed into the classifier housing via the product feed port 56.
  • the coarse material comes from this product, i.e. the proportion of particles with greater mass against the classifying air in the area of the coarse material discharge 68 and is made available for further processing.
  • the fines i.e.
  • the particle fraction with a lower mass is mixed with the classifying air, reaches radially from the outside inwards through the classifying wheel into the outlet port 57, into the outlet chamber 58 and finally via the fine material outlet pipe 65 into the fine material outlet, and from there into a filter in which air and Fines are separated from each other.
  • Coarser fine material components are thrown radially out of the classifying wheel and mixed with the coarse material in order to leave the housing with the coarse material or to rotate in the classifier housing until it has become a fine material of such a grain that it is discharged with the classifying air.
  • the classifier can in turn be well maintained by dividing the classifier housing in the manner described and assigning the classifier components to the individual partial housings, and components which have become defective can be replaced with relatively little effort and within short maintenance times.
  • FIG. 3 While the sight wheel with the two cover disks 1, 2 and the blade ring 3 arranged between them is shown in the overall arrangements according to FIG. 1, in a known, conventional form with parallel and parallel-area cover disks, the sight wheel is shown in FIG. 3 shown for the air classifier designed according to the invention.
  • the outflow-side cover plate 1 is still flat and is arranged in a plane which is perpendicular to the axis of rotation 4 of the classifying wheel and the longitudinal axis of the classifier, regardless of whether the axis of rotation and longitudinal axis 4 is vertical or horizontal. It concentrically surrounds the outlet nozzle 5. From the cover disk 1 on the outflow side, the blades 3 are directed from there toward the second cover disk 2. The blades 3 are connected to both cover disks 1, 2.
  • the lower cover plate 2 is now conical, in contrast to the prior art, and was preferably such that the distance between the second cover plate 2 and the outflow-side cover plate 1 from the rim of the blades 3 increases, preferably again continuously and preferably so that the area of the flow through the cylinder jacket remains constant for each radius between the blade outlet edges and outlet nozzle 5.
  • the outflow velocity which decreases due to the decreasing radius in known solutions, remains constant with this solution.
  • the classifying wheel 1 to 3 can be configured as shown in FIG. 3 both in the classifier design according to FIG. 1 and in the classifier design according to FIG. 2 requires no special explanation. It is only to be considered that in the case of the classifier according to FIG. 1, the classifying wheel is installed as shown in FIG. 3 ("outflow-side, upper cover plate” is class 1), while in the classifier according to FIG. 2 the classifying wheel is compared to the illustration 3 is installed rotated by 180 (the "outflow-side cover plate” 1 is the lower cover plate in the installed state).
  • connection between the downstream cover plate (upper cover plate 1 in FIG. 1 or lower cover plate 2 in FIG. 2) and outlet connection 18 (FIG. 1) or 20 (FIG. 2) also in the classifier design according to FIG 2 can be designed as shown in the classifier arrangement shown in FIG. 1, one has to imagine that the outlet connection 57 and the outlet chamber 58 are connected in a rotationally fixed manner to the lower cover plate 2 of the classifier wheel and the arms 61 are removed from the ring -housing 62 are spaced so that rotational movements of the outlet nozzle 57 and the outlet chamber 58 are possible together with the classifying wheel 1-3, whereby a ring bearing can have a centering function.
  • the structural connection between the outlet chamber 58 and the fine material discharge pipe 65 must be removed without impairing the flow medium transfer.
  • FIG. 1 belongs to FIG. 4, which shows this area larger.
  • the outlet connection 5 initially opens as in FIG. 1 into the tube section 18, which, however, still has a clear, chamber-like cross-sectional widening in the region of the bearing 20.

Landscapes

  • Combined Means For Separation Of Solids (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
  • Steroid Compounds (AREA)
  • Confectionery (AREA)
  • Separating Particles In Gases By Inertia (AREA)
  • Centrifugal Separators (AREA)

Abstract

The subject of the invention is a preferably vertical pneumatic classifier, having a rotating classifying wheel (11) against which the classifying air which is loaded with fine material flows radially from the outside to the inside counter to the centrifugal force. The classifying air flows off out of the classifying wheel axially through an outlet connecting piece (20), in order to be supplied to a further evaluation, for example in a filter or the like. The classifying wheel has an outflow-side second cover plate which is offset axially with respect to said wheel and has blades arranged between the cover plates, on their outer circumference. The outlet connecting piece (20) which leads away from the classifying wheel (11) opens into an outlet chamber (21), the cross-section of which is significantly larger than the cross-section of the outlet connecting piece (20) so that there is a sudden change in the cross-section between the outlet connecting piece and outlet chamber. The clear height between the outflow-side cover plate (1) and second cover plate (2) of the classifying wheel preferably changes from the outlet edges of the blades (3) to the outlet connecting piece (5) in the form of an increase. In addition, the outlet connecting piece (5, 6, 18) is to be preferably inserted with an immersion pipe section (5, 6) as far as into the outflow-side cover plate (1) and connected fixed in terms of rotation to the latter.

Description

Die vorliegende Erfindung bezieht sich auf einen Windsichter mit einem Sichtrad. Das Sichtrad weist zwei Deckscheiben auf, die unter Zwischenschaltung von Schaufeln nahe dem Außenumfang in einem vorgegebenen Abstand voneinander gehalten werden. Dieses Sichtrad ist um eine Achse drehbar in einem feststehenden Gehäuse gelagert. Das zu sichtende Gut besteht aus gröberen und feineren Staubpartikeln, die in einem Luftstrom mitgeführt werden und den Produktstrom bilden, der in das Gehäuse eingeführt wird. Er gelangt in radialer Richtung in das Sichtrad. In ihm werden die gröberen Staubpartikel aus dem Luftstrom ausgeschieden und der Luftstrom verläßt mit den Feinstaubparrikeln axial das Sichtrad durch ein Abströmrohr. Der Luftstrom mit den Feinstaubpartikeln kann einem Filter zugeführt werden, in dem Luft und Feinstaub voneinander getrennt werden.The present invention relates to an air classifier with a classifying wheel. The classifying wheel has two cover disks which are held at a predetermined distance from one another with the interposition of blades near the outer circumference. This classifying wheel is rotatably mounted about an axis in a fixed housing. The material to be sifted consists of coarser and finer dust particles that are carried in an air stream and form the product stream that is introduced into the housing. It reaches the classifying wheel in the radial direction. In it the coarser dust particles are separated from the air flow and the air flow with the fine dust particles axially leaves the sight wheel through a discharge pipe. The air flow with the fine dust particles can be fed to a filter in which air and fine dust are separated from one another.

Ein genereller Aspekt der vorliegenden Erfindung ist es, einen solchen Windsichter so auszubilden, daß die Strömungsverhältnisse verbessert werden, um Energie einsparen zu können, um die Wirksamkeit bezüglich der Trennleistung zu verbessern und um eine kompakte Bauweise zu ermöglichen.A general aspect of the present invention is to design such an air classifier in such a way that the flow conditions are improved in order to save energy, in order to improve the effectiveness with regard to the separation performance and in order to enable a compact construction.

Es ist ein besonderer Aspekt der vorliegenden Erfindung, einen Windsichter in der Weise auszubilden, daß die Führung des mittels des Sichtrads vom Produktstrom abgezweigten Feingutstroms bis zum Feingutaustritt aus dem Sichtergehäuse möglichst verschleißarm erfolgt. Es ist ein weiterer Aspekt der vorliegenden Erfindung, unvermeidbare Verschleißerscheinungen bei Wartungsarbeiten am Sichter bequem feststellen zu können und sie beheben zu können. Der Windsichter soll also insoweit verschleißarm und wartungs- bzw. reparaturfreundlich sein.It is a special aspect of the present invention to design an air classifier in such a way that the fine material flow diverted from the product flow by means of the classifying wheel is carried out with as little wear as possible until the fine material emerges from the classifier housing. It is a further aspect of the present invention to be able to conveniently determine inevitable signs of wear during maintenance work on the classifier and to be able to remedy them. The wind sifter should therefore be low-wear and easy to maintain and repair.

Es ist ein weiterer Aspekt der vorliegenden Erfindung, für eine Vergleichmäßigung der Strömung zwischen den beiden Deckscheiben des Sichtrades in den Strömungskanälen zu sorgen, die von den beiden Deckscheiben und den Schaufeln begrenzt werden. Im Rahmen dieses Aspekts soll die Strömungsgeschwindigkeit zur Berücksichtigung besonderer Betriebsbedingungen gegenüber den Werten verändert werden können, die sich dann zwangsläufig einstellen, wenn die beiden Deckscheiben oder zumindest deren einander zugekehrten Seiten bzw. Flächen parallel zueinander verlaufen, wie es bei bekannten Windsichtern der Fall ist.It is a further aspect of the present invention to ensure an equalization of the flow between the two cover plates of the classifying wheel in the flow channels, which are delimited by the two cover plates and the blades. Within the scope of this aspect, the flow speed should be able to be changed in relation to the values to take into account special operating conditions, which inevitably occur when the two cover disks or at least their mutually facing sides or surfaces run parallel to one another, as is the case with known air classifiers.

Es ist schließlich ein Aspekt der vorliegenden Erfindung, einen Windsichter im Bereich seines Sichtrades so auszubilden, daß Verluste infolge Relativbewegungen zwischen bewegten Teilen und feststehenden Bauteilen deutlich verringert werden. Dabei soll gleichzeitig eine kompakte Sichterbauweise ermöglicht werden.Finally, it is an aspect of the present invention to design a wind classifier in the region of its classifying wheel in such a way that losses due to relative movements between moving parts and stationary components are significantly reduced. At the same time, a compact classifier design should be made possible.

Die wesentlichen Merkmale der Erfindung ergeben sich aus den Patentansprüchen, und die Erfindung ist nachfolgend anhand der Zeichnungen näher beschrieben.The essential features of the invention result from the claims, and the invention is described in more detail below with reference to the drawings.

In der Zeichnung zeigen:

  • Fig. 1 zur Erläuterung eines Aspekts der Erfindung einen Windsichter, wie er bei der Erfindung zur Anwendung kommt, in vertikaler Anordnung und als Mittellängsschnitt, wobei das Sichtrad noch so ausgebildet ist, wie es heute in der Praxis im allgemeinen zur Anwendung kommt,
  • Fig. 2 in einer Figur 1 entsprechenden Darstellung einen Windsichter in erfindungsgemäßer Bauweise, wobei jedoch das Sichtrad selbst ebenfalls noch so ausgebildet ist, wie es heute in der Praxis im allgemeinen zur Anwendung kommt, diesem Sichtrad jedoch das Auslaßrohr für das Gemisch aus Sichtluft und zumindest nahezu staubförmigen Feststoffpartikeln so zugeordnet ist, daß einem Teilaspekt der vorliegenden Erfindung Rechnung getragen ist, obwohl diese Zuordnung an sich bereits bekannt ist,
  • Fig. 3 in schematischer Darstellung und als Vertikalschnitt ein Sichtrad, das für einen der Aspekte der Erfindung erfindungsgemäß ausgestaltet ist und sowohl bei einem Sichter gemäß Fig. 1 als bei einem Sichter gemäß Fig. 2 zur Anwendung kommen kann und
  • Fig. 4 eine Einzelheit in größerer Darstellung.
The drawing shows:
  • 1 to explain an aspect of the invention, a wind sifter as used in the invention, in a vertical arrangement and as a central longitudinal section, the sifting wheel being designed as it is generally used in practice today,
  • Fig. 2 in a representation corresponding to Figure 1, a wind sifter in the construction according to the invention, but the classifying wheel itself is also designed as it is generally used in practice today, but this classifying wheel is the outlet pipe for the mixture of classifying air and at least almost dust-like solid particles is assigned so that a partial aspect of the present invention is taken into account, although this assignment is already known per se,
  • 3 shows a schematic illustration and as a vertical section of a classifying wheel which is designed according to the invention for one of the aspects of the invention and can be used both in a classifier according to FIG. 1 and in a classifier according to FIG. 2 and
  • Fig. 4 shows a detail in a larger representation.

Einer nicht dargestellten Abscheidevorrichtung ist ein ursprünglicher Rohgasstrom zugeführt worden, in dem grobe und feine Feststoffpartikel suspendiert waren. Die groben Partikel wurden aus dem ursprünglichen Rohgasstrom ausgeschieden und aus dem Abscheidergehäuse entfernt. Der verbleibende Rohgasstrom mit den in ihm verbliebenen kleineren, gewichtsärmeren Partikeln gelangt in den Windsichter gemäß Fig. 1 oder gemäß Fig. 2, wobei jedoch auch diese kleineren, gewichtsärmeren Partikel unterschiedlich sind bezüglich ihrer Größe bzw. ihres Gewichtes, also bezüglich ihrer "Masse".An original crude gas stream, in which coarse and fine solid particles were suspended, was fed to a separation device (not shown). The coarse particles were removed from the original raw gas stream and removed from the separator housing. The remaining raw gas stream with the smaller, lighter-weight particles remaining in it flows into the air classifier according to FIG. 1 or according to FIG. 2, although these smaller, lighter-weight particles are also different with regard to their size or weight, that is to say with regard to their "mass" .

Der Windsichter gemäß Fig. 1 weist ein Sichtrad auf, das seinerseits eine erste, abströmseitige, bei vertikaler Anordnung des Sichters obere Deckscheibe 1 und eine dazu axial versetzte zweite, bei vertikaler Anordnung des Sichters untere Deckscheibe 2 aufweist. Zwischen den beiden Deckscheiben 1,2 befinden sich in gleichmäßigen Abständen in Umfangsrichtung Schaufeln 3. Derartige Sichträder sind an sich bekannt, so daß weitere Ausführungen zur Ausbildung der Schaufeln 3 nicht gemacht werden müssen. Sie sind am Außenumfang der abströmseitigen und zweiten Deckscheibe 1, 2 fest zwischen diesen angeordnet, indem die beiden Deckscheiben beispielsweise durch Bolzen zusammengehalten sind und zwischen sich die Schaufeln halten. Deckscheiben und Schaufeln bilden das um seine Längsachse 4 drehende Sichtrad. Diese Längsachse 4 kann grundsätzlich vertikal stehen und einen stehenden Sichter kennzeichnen oder sie kann horizontal liegen und einen liegenden Windsichter kennzeichnen.1 has a classifier wheel, which in turn has a first cover plate 1 on the outflow side, which is upper in the case of a vertical arrangement of the classifier, and a second cover plate 2 which is axially offset with respect thereto and in the case of a vertical arrangement of the classifier. Between the two cover disks 1, 2 there are blades 3 at regular intervals in the circumferential direction. Such classifying wheels are known per se, so that more Comments on the formation of the blades 3 do not have to be made. They are fixedly arranged on the outer circumference of the outflow-side and second cover disks 1, 2 by holding the two cover disks together, for example by bolts, and holding the blades between them. Cover disks and blades form the classifying wheel rotating about its longitudinal axis 4. This longitudinal axis 4 can in principle stand vertically and mark a standing classifier or it can lie horizontally and mark a lying wind classifier.

Mit der abströmseitigen Deckscheibe 1 ist der Austrittsstutzen 5 fest verbunden. Er ist als Tauchrohr mit dem Abschnitt 6 in das Innere des Sichtrades 1 bis 3 hineingeführt, um innerhalb des Sichtrades mit der abströmseitigen Deckscheibe 1 drehfest verbunden zu sein. In einem oberen Abschnitt 7 ist der Austrittsstutzen oberhalb der Deckscheibe 1 innen trichterförmig erweitert; An- und Abströmung der mit Feinstaub angereicherten von einem Abscheider kommenden Sichtluft sind durch Pfeile 8,9 gekennzeichnet.The outlet connection 5 is firmly connected to the outflow-side cover plate 1. It is inserted as a dip tube with section 6 into the interior of the sight wheel 1 to 3 in order to be connected in a rotationally fixed manner within the sight wheel to the cover disk 1 on the outflow side. In an upper section 7, the outlet nozzle above the cover plate 1 is widened in a funnel shape; Arrows and outflows of the visual air enriched with fine dust coming from a separator are indicated by arrows 8.9.

Das Sichtrad und der dem Sichtrad zugeordnete Austrittsstutzen 5 sind in einem Gehäuse angeordnet, das aus einem topfförmigen Unterteil 10 und einem oberen Deckel 11 besteht. Die beiden Gehäuseteile 10,11 liegen in Umfangsflanschen 12,13 aufeinander und sind durch durch diese Umfangsflansche hindurchgesteckte Schraubverbindungen 14 lösbar miteinander verbunden. Das Gehäuseunterteil 10 weist eine seitliche Konsole 15 auf, in der der Deckel 11 mittels eines Zapfen 16 um dessen Längsachse schwenkbar gelagert ist. Zum Schwenken des Deckels 11 um die Längsachse des Zapfens 16 werden die durch die Flansche 12,13 gesteckten Schraubverbindungen 14 gelöst. Der Deckel 11 ist mit einem halsförmigen Ansatz 17 versehen, in dem der Austrittsstutzen 5 mit einem oberen, zylinderrohrförmigen Abschnitt 18 in zwei axial gegeneinander versetzten Lagern 19,20 um seine Längsachse drehbar gelagert ist.The classifying wheel and the outlet port 5 assigned to the classifying wheel are arranged in a housing which consists of a pot-shaped lower part 10 and an upper cover 11. The two housing parts 10, 11 lie one above the other in peripheral flanges 12, 13 and are detachably connected to one another by screw connections 14 inserted through these peripheral flanges. The lower housing part 10 has a lateral bracket 15, in which the cover 11 is pivotally mounted about its longitudinal axis by means of a pin 16. To pivot the cover 11 about the longitudinal axis of the pin 16, the screw connections 14 inserted through the flanges 12, 13 are released. The cover 11 is provided with a neck-shaped extension 17, in which the outlet connection 5, with an upper, cylindrical tubular section 18, is rotatably mounted about its longitudinal axis in two axially offset bearings 19, 20.

Am oberen Ende ist der Austrittsstutzen an eine nicht gezeichnete Unterdruckquelle angeschlossen.At the upper end, the outlet nozzle is connected to a vacuum source, not shown.

Das Antriebsdrehmoment für das Verdichterrad wird teilweise am oberen Ende des Austrittsstutzens 5,6 bzw. 18 eingeleitet, wozu als Beispiel außerhalb des oberen, durch einen Deckel lösbar verschlossenen Endes des halsförmigen Ansatzes 17 eine drehfest mit dem Austrittsstutzen verbundene Riemenscheibe 21 und ein auf diese einwirkender Antriebsriemen 22 dargestellt sind; teilweise wird das Antriebsdrehmoment auch über die zweite Deckscheibe 2 eingeleitet, indem außerhalb eines Ansatzes 27 des Lagergehäuseteils 10 einem Lagerbolzen 24 der Deckscheibe 2 ein Riementrieb 30,31 zugeordnet ist. Die Riementriebe 21,22 einerseits und 30,31 andererseits sind so aufeinander abgestimmt, daß die beiden Deckscheiben 2,3 mit gleichen Drehzahlen oder aber in einem gewollten anderen Drehzahlverhältnis angetrieben werden. Sind die beiden Deckscheiben 1,2 fest miteinander verbunden, so ist nur ein Synchronantrieb möglich. Werden beide Deckscheiben mit unterschiedlichen Drehzahlen angetrieben, so ist auf eine bewegliche, dichtende, aber auch abriebfeste Verbindung zwischen Deckscheiben und Schaufeln zu achten. Bei fest miteinander verbundenen Deckscheiben ist selbstverständlich auch ein üblicher Antrieb möglich, bei dem nur eine der Deckscheiben angetrieben wird, also beispielsweise nur der Antrieb 21,22 oder nur der Antrieb 30,31 vorgesehen ist.The drive torque for the compressor wheel is partially introduced at the upper end of the outlet nozzle 5, 6 or 18, for which purpose, for example, outside the upper end of the neck-shaped extension 17, which is releasably closed by a cover, a pulley 21 connected to the outlet nozzle and acting on it Drive belts 22 are shown; in part, the drive torque is also introduced via the second cover disk 2, in that a belt drive 30, 31 is assigned to a bearing bolt 24 of the cover disk 2 outside a shoulder 27 of the bearing housing part 10. The belt drives 21, 22 on the one hand and 30, 31 on the other hand are matched to one another in such a way that the two cover disks 2, 3 are driven at the same speed or in a desired different speed ratio. If the two cover disks 1, 2 are firmly connected to one another, only a synchronous drive is possible. If both shrouds are driven at different speeds, a flexible, sealing, but also abrasion-resistant connection between shrouds and blades must be ensured. In the case of cover disks which are firmly connected to one another, a conventional drive is of course also possible, in which only one of the cover disks is driven, for example only the drive 21, 22 or only the drive 30, 31 is provided.

Die zweite, bei vertikaler Anordnung des Windsichters untere Deckscheibe 2 ist mittels eines Zapfens 23 an dem Lagerbolzen 24 befestigt, der in Lagern 25,26 in dem halsförmigen Ansatz 27 des Gehäuseunterteils 10 um seine Längsachse drehbar gelagert ist.The second cover disk 2, which is lower in the case of a vertical arrangement of the air classifier, is fastened to the bearing pin 24 by means of a pin 23, which is rotatably mounted about its longitudinal axis in bearings 25, 26 in the neck-shaped extension 27 of the lower housing part 10.

Konzentrisch zu dem Kranz der Schaufeln 3 und außerhalb dieses Schaufelkranzes ist ein Führungsrohr 32 angeordnet und mit Stützschaufeln 33 im Gehäuseunterteil 10 derart gehalten, daß es den Schaufelkranz 3 konzentrisch umgibt.A guide tube 32 is arranged concentrically with the rim of the blades 3 and outside of this blade rim and is held with support blades 33 in the lower housing part 10 such that it surrounds the blade rim 3 concentrically.

Unterhalb der unteren, zweiten Deckscheibe 2 mündet unmittelbar über dem Gehäuseboden radial in das Gehäuseunterteil 10 ein Einlaßstutzen 34 zur Einbringung der Sichtluft. Im Bereich des Führungsrohres 32 und zwischen den Deckscheiben 1,2 mündet radial in das Gehäuseunterteil 10 ein Einlaßstutzen 35 für das Gut, das mittels einer im Einlaßstutzen 35 angeordneten Einlaßschnecke 36 in das Gehäuse gefördert wird.Below the lower, second cover plate 2, an inlet connection 34 opens radially into the lower housing part 10 directly above the housing base for introducing the classifying air. In the area of the guide tube 32 and between the cover disks 1, 2, an inlet connection 35 for the material opens radially into the lower housing part 10 and is conveyed into the housing by means of an inlet screw 36 arranged in the inlet connection 35.

Bei laufendem Sichtrad 1 bis 3 tritt die Sichtluft durch den Stutzen 34, das Gut durch den Stutzen 35 in das Gehäuseunterteil 10 ein, worauf die mit Gut angereicherte Sichtluft durch den Ringkanal 37 zwischen dem Führungsrohr 32 und der Wand des Gehäuseunterteils 10 hindurch einem Krümmer 38 im Gehäusedeckel 11 zugeführt wird, in dem eine Strömungsumkehr erfolgt. Die gutangereicherte Sichtluft gelangt nun in den Bereich innerhalb des Führungsrohres 32, um von dort aus in radialer Richtung in das Sichtrad eingesaugt zu werden, wo an den Schaufeln 3 eine Abtrennung von zu grobkörnigem Gut erfolgt, so daß in das Sichtrad feingutbeladene Sichtluft gelangt. Diese feingutbeladene Sichtluft wird im Sichtrad in eine axiale Strömungsrichtung umgelenkt und wird nunmehr durch das Tauchrohr 5 abgesaugt. In einem dem Tauchrohrabschnitt 18 nachgeschalteten Filter wird auch noch das Feingut aus der Luft ausgefiltert. Das zu grobe Gut gelangt entlang der zweiten Deckscheibe 2 in den Bereich unterhalb der zweiten Deckscheibe 2, um von dort in geeigneter Weise weiterbearbeitet zu werden. Es wird dem Sichtergehäuse an geeigneter Stelle und in geeigneter Weise entnommen, was jedoch im einzelnen nicht erläutert werden soll, weil es nicht Teil der Erfindung ist.With the classifying wheel 1 to 3 running, the classifying air enters through the connecting piece 34, the material through the connecting piece 35 into the lower housing part 10, whereupon the classifying air enriched with good through the annular channel 37 between the guide tube 32 and the wall of the lower part 10 through a manifold 38 is supplied in the housing cover 11, in which a flow reversal takes place. The well-enriched classifying air now gets into the area inside the guide tube 32 to be sucked in from there in the radial direction into the classifying wheel, where the coarse-grained material is separated off on the blades 3, so that classifying material laden with fine material enters the classifying wheel. This fine air laden sight air is deflected in the sight wheel in an axial flow direction and is now sucked off through the dip tube 5. The fine material is also filtered out of the air in a filter downstream of the dip tube section 18. The material that is too coarse reaches the area below the second cover plate 2 along the second cover plate 2 in order to be further processed from there in a suitable manner. It becomes the classifier housing taken in a suitable place and in a suitable manner, which however should not be explained in detail because it is not part of the invention.

Nach dem Aufklappen des Gehäusedeckels 11 ist das Innere des Gehäuses 10,11 gut zugänglich und eine Reinigung und Wartung insbesondere des von der unteren Deckscheibe 2 entfernten Sichtradteiles mit der oberen Deckscheibe 1 und den Schaufeln 3 und gegebenenfalls dessen Reparatur sind gut möglich.After opening the housing cover 11, the interior of the housing 10, 11 is easily accessible and cleaning and maintenance, in particular of the classifying wheel part with the upper cover disc 1 and the blades 3 removed from the lower cover disc 2, and, if appropriate, its repair are easily possible.

Auch bei dem Windsichter gemäß Fig. 2 wird der gesamte vertikale Windsichter umschlossen von einem Gehäuse, das im wesentlichen aus dem Gehäuseoberteil 40 und dem Gehäuseunterteil 41 besteht. Gehäuseoberteil 40 und Gehäuseunterteil 41 sind am oberen bzw. unteren Rand mit je einem nach außen gerichteten Umfangsflansch 42 bzw. 43 versehen. Die beiden Flansche 42,43 liegen im Einbau- bzw. Funktionszustand des Sichters aufeinander und sind durch geeignete Mittel gegeneinander fixiert. Geeignete Mittel zum Fixieren sind beispielsweise Schraubverbindungen. Als lösbare Befestigungsmittel können auch Klammern oder dgl. dienen.2, the entire vertical air classifier is enclosed by a housing which essentially consists of the upper housing part 40 and the lower housing part 41. Upper housing part 40 and lower housing part 41 are each provided with an outwardly directed peripheral flange 42 and 43 on the upper and lower edge. In the installed or functional state of the classifier, the two flanges 42, 43 lie on one another and are fixed against one another by suitable means. Suitable means for fixing are, for example, screw connections. Clamps or the like can also serve as releasable fastening means.

An einer praktisch beliebigen Stelle des Flanschumfangs sind beide Flansche durch ein Gelenk 44 miteinander so verbunden, daß das Gehäuseoberteil 40 nach dem Lösen der Flanschverbindungsmittel gegenüber dem Gehäuseunterteil 41 nach oben in Richtung des Pfeiles 45 geschwenkt werden kann und das Gehäuseoberteil 40 von unten, das Gehäuseunterteil 41 von oben zugänglich ist. Das Gehäuseunterteil 41 seinerseits ist zweiteilig ausgebildet und es besteht im wesentlichen aus dem zylindrischen Sichtraumgehäuse 46 mit dem Flansch 43 an seinem oberen offenen Ende und dem Austragkonus 47, der sich nach unten kegelförmig verjüngt. Austragkonus 47 und Sichtraumgehäuse 46 liegen am oberen bzw. unteren Ende mit Flanschen 48,49 aufeinander und beide Flansche 48,49 von Austragkonus 47 und Sichtraumgehäuse 46 sind wie die Flansche 43,44 durch lösbare Befestigungsmittel miteinander verbunden. Das so zusammengesetzte Sichtergehäuse ist in Tragarmen 50 aufgehängt, von denen mehrere möglichst gleichmäßig beabstandet auf den Umfang des Verdichtergehäuses verteilt sind und am zylindrischen Sichtraumgehäuse 46 angreifen.At practically any point on the flange circumference, both flanges are connected to one another by a joint 44 in such a way that the upper housing part 40 can be pivoted upwards in the direction of arrow 45 relative to the lower housing part 41 after the flange connection means have been released, and the upper housing part 40 from below, the lower housing part 41 is accessible from above. The lower housing part 41 in turn is formed in two parts and it consists essentially of the cylindrical visible space housing 46 with the flange 43 at its upper open end and the discharge cone 47, which tapers conically downwards. The discharge cone 47 and the viewing space housing 46 lie on top of one another at the upper and lower ends with flanges 48, 49 and both flanges 48, 49 of the discharge cone 47 and the viewing space housing 46 are connected to one another like the flanges 43, 44 by releasable fastening means. The classifier housing assembled in this way is suspended in support arms 50, several of which are distributed as uniformly as possible over the circumference of the compressor housing and act on the cylindrical classroom housing 46.

Wesentliches Teil der Gehäuseeinbauten des Windsichters ist wiederum das Sichtrad mit der oberen Deckscheibe 1, der zu dieser axial beabstandeten unteren abströmseitigen Deckscheibe 2 und den zwischen den Außenrändern der beiden Deckscheiben 1,2 angeordneten, mit diesen fest verbundene und gleichmäßig auf den Umfang des Sichtrades verteilte Schaufeln 3 zweckmäßiger Kontur. Bei diesem Windsichter wird der Antrieb des Sichtrads über die obere Deckscheibe 1 bewirkt, während die untere Deckscheibe 2 die abströmseitige Deckscheibe ist. Die Lagerung des Sichtrads umfaßt eine in zweckmäßiger Weise zwangsweise angetriebene Welle 51, die mit dem oberen Ende aus dem Sichtergehäuse herausgeführt ist und mit ihrem unteren Ende innerhalb des Sichtergehäuses in fliegender Lagerung drehfest das Sichtrad trägt. Die Herausführung der Sichtradwelle 51 aus dem Sichtergehäuse erfolgt in einem Paar bearbeiteter Platten 52,53, die das Gehäuse am oberen Ende eines nach oben kegelstumpfförmig verlaufenden Gehäuseendabschnitts 54 abschließen, die Welle führen und diesen Wellendurchtritt ohne Behinderung der Drehbewegungen der Welle abdichten. Zweckmäßigerweise kann die obere Platte 53 als Flansch drehfest der Welle 51 zugeordnet und über Drehlager 55 drehbar auf der unteren Platte 52 abgestützt sein, die ihrerseits dem Gehäuseendabschnitt 54 zugeordnet ist. Die Unterseite der abströmseitigen Deckscheibe 2 liegt in der gemeinsamen Ebene zwischen den Flanschen 43,44, so daß das Sichtrad in seiner Gesamtheit innerhalb des klappbaren Gehäuseoberteils angeordnet ist. Im Bereich des konischen Endabschnitts 54 weist das Gehäuseoberteil 40 außerdem den Produktaufgabestutzen 56 auf, der ein Rohr ist, dessen Längsachse parallel zur Drehachse des Sichtrads 11 und seiner Antriebswelle 51 verläuft und das möglichst weit außen angeordnet ist.An essential part of the built-in housing of the air classifier is in turn the classifying wheel with the upper cover plate 1, the lower downstream classing plate 2 axially spaced apart from this and the arranged between the outer edges of the two classing plates 1, 2, firmly connected to it and evenly distributed over the circumference of the classifying wheel Buckets 3 appropriate contour. In this air classifier, the driving of the classifying wheel is effected via the upper cover plate 1, while the lower cover plate 2 is the cover plate on the outflow side. The bearing of the classifying wheel comprises an expediently positively driven shaft 51 which is led out of the classifier housing with the upper end and carries the classifying wheel in a rotationally fixed manner within the classifier housing in a rotationally fixed position. The sight wheel shaft 51 is led out of the classifier housing in a pair of machined plates 52, 53, which close off the housing at the upper end of an upwardly frustoconical housing end section 54, guide the shaft and seal this shaft passage without obstructing the rotational movements of the shaft. The upper plate 53 can expediently be assigned as a flange to the shaft 51 in a rotationally fixed manner and can be rotatably supported on the lower plate 52, which in turn is assigned to the housing end section 54, via rotary bearings 55. The underside of the outflow-side cover plate 2 lies in the common plane between the flanges 43, 44, so that the classifying wheel is arranged in its entirety within the foldable upper housing part. In the area of the conical end section 54, the upper housing part 40 also has the product feed port 56, which is a tube, the longitudinal axis of which runs parallel to the axis of rotation of the classifying wheel 11 and its drive shaft 51 and which is arranged as far out as possible.

Das Sichtraumgehäuse 46 nimmt den achsgleich zum Sichtrad angeordneten rohrförmigen Austrittsstutzen 57 auf, der mit seinem oberen Ende dicht unterhalb der abströmseitigen Deckscheibe 2 des Sichtsrads liegt, ohne jedoch mit diesem verbunden zu sein. An das untere Ende des als Rohr ausgebildeten Austrittsstutzens ist eine Austrittskammer 58 achsgleich angesetzt, die ebenfalls rohrförmig ist, deren Durchmesser jedoch wesentlich größer ist als der Durchmesser des Austrittsstutzens 57, zumindest doppelt so groß ist wie der Durchmesser des Austrittsstutzens. Am Übergang zwischen Austrittsstutzen 57 und Austrittskammer 58 liegt also ein deutlicher Durchmessersprung vor. Der Austrittsstutzen ist in eine obere Deckplatte 59 der Austrittskammer 58 eingesetzt, unten ist die Austrittskammer 58 durch einen abnehmbaren Deckel 60 verschlossen. Die Baueinheit aus Austrittsstutzen 57 und Austrittskammer 58 ist in mehreren Tragarmen 61 gehalten, die sternförmig gleichmäßig auf den Umfang der Baueinheit verteilt sind, mit ihren inneren Enden im Bereich des Austrittsstutzens fest mit der Baueinheit verbunden und mit ihren äußeren Enden am Sichtergehäuse befestigt sind.The viewing space housing 46 accommodates the tubular outlet connection 57 which is arranged coaxially with the viewing wheel and which lies with its upper end just below the outflow-side cover disk 2 of the viewing wheel, but without being connected to it. At the lower end of the outlet connector designed as a tube, an outlet chamber 58 is placed in the same axis, which is also tubular, but the diameter of which is considerably larger than the diameter of the outlet connector 57, at least twice as large as the diameter of the outlet connector. At the transition between the outlet nozzle 57 and the outlet chamber 58, there is therefore a clear jump in diameter. The outlet port is inserted into an upper cover plate 59 of the outlet chamber 58, at the bottom the outlet chamber 58 is closed by a removable cover 60. The assembly consisting of outlet nozzle 57 and outlet chamber 58 is held in a plurality of support arms 61, which are distributed in a star shape evenly over the circumference of the unit, with their inner ends in the region of the outlet nozzle firmly connected to the unit and with their outer ends attached to the classifier housing.

Der Austrittsstutzen 57 ist von einem kegelförmigen Ringgehäuse 62 umgeben, dessen unterer, größerer Außendurchmesser zumindest etwa dem Durchmesser der Austrittskammer und dessen oberer, kleinerer Außendurchmesser zumindest etwa dem Durchmesser des Sichtrads entspricht. An der konischen Wand des Ringgehäuses 62 enden die Tragarme 61 und sind mit dieser Wand fest verbunden, die ihrerseits wieder Teil der Baueinheit aus Austrittsstutzen 57 und Austrittskammer 58 ist.The outlet connection 57 is surrounded by a conical ring housing 62, the lower, larger outer diameter of which is at least approximately that Diameter of the outlet chamber and its upper, smaller outer diameter corresponds at least approximately to the diameter of the classifying wheel. The support arms 61 end on the conical wall of the ring housing 62 and are firmly connected to this wall, which in turn is part of the structural unit comprising the outlet connector 57 and the outlet chamber 58.

Die Tragarme 61 und das Ringgehäuse 62 sind Teile einer Spüllufteinrichtung, wobei die Spülluft das Eindringen von Materie aus dem Innenraum des Sichtraumgehäuses 46 in den Spalt zwischen Sichtrad bzw. dessen unterer Deckscheibe 2 und Austrittsstutzen 57 verhindert. Um diese Spülluft in das Ringgehäuse 62 und von dort in den freizuhaltenden Spalt gelangen zu lassen, sind die Tragarme 61 als Rohre ausgebildet, mit ihren äußeren Endabschnitten durch die Wand des Sichtergehäuses hindurchgeführt und über ein Ansaugfilter 63 an eine Spülluftquelle angeschlossen. Das Ringge- häuse 62 ist nach oben durch eine Lochplatte 64 abgeschlossen und der Spalt selbst kann durch eine axial verstellbare Ringscheibe im Bereich zwischen Lochplatte 64 und unterer Deckscheibe 2 des Sichtrads 1,2,3 einstellbar sein.The support arms 61 and the ring housing 62 are parts of a purge air device, the purge air preventing the ingress of matter from the interior of the view space housing 46 into the gap between the view wheel or its lower cover plate 2 and outlet connection 57. In order to allow this purge air to enter the ring housing 62 and from there into the gap to be kept free, the support arms 61 are designed as tubes, their outer end sections are led through the wall of the classifier housing and are connected via a suction filter 63 to a purge air source. The ring housing 62 is closed at the top by a perforated plate 64 and the gap itself can be adjustable by an axially adjustable ring disk in the area between the perforated plate 64 and the lower cover disk 2 of the sight wheel 1, 2, 3.

Der Auslaß aus der Austrittskammer 58 wird von einem Rohr 65 gebildet, das von außen in das Sichtraumgehäuse 46 hineingeführt ist und in tangentialer Anordnung an die Austrittskammer 58 angeschlossen ist. Der Verkleidung der Einmündung des Feingutaustragrohrs 65 an die Austrittskammer 58 dient ein Abweiskegel 66.The outlet from the outlet chamber 58 is formed by a tube 65, which is guided into the view chamber housing 46 from the outside and is connected to the outlet chamber 58 in a tangential arrangement. A deflecting cone 66 serves to clad the opening of the fine material discharge pipe 65 to the outlet chamber 58.

Am unteren Ende des konischen Teilgehäuses 47 sind in horizontaler Anordnung die Sichtlufteintrittsspirale 67 und der Grobgutaustrag 68 dem Teilgehäuse 47 zugeordnet. Die Drehrichtung der Sichtlufteintrittsspirale 67 ist der Drehrichtung des Sichtrads entgegengerichtet. Der Grobgutaustrag 68 ist dem Teilgehäuse 47 abnehmbar zugeordnet, wobei dem unteren Ende des Teilgehäuses 47 ein Flansch 69 und dem oberen Ende des Grobgutaustrags 61 ein Flansch 70 zugeordnet und beide Flansche wiederum durch bekannte Mittel lösbar miteinander verbunden sind, wenn der Sichter betriebsbereit ist.At the lower end of the conical partial housing 47, the visible air inlet spiral 67 and the coarse material discharge 68 are assigned to the partial housing 47 in a horizontal arrangement. The direction of rotation of the sight air inlet spiral 67 is opposite to the direction of rotation of the sight wheel. The coarse material discharge 68 is removably assigned to the partial housing 47, a flange 69 being assigned to the lower end of the partial housing 47 and a flange 70 being assigned to the upper end of the coarse material discharge 61, and both flanges are in turn releasably connected to one another by known means when the classifier is ready for operation.

Die auszulegende Dispersionszone ist mit 71 bezeichnet. An der Innenkante bearbeitete (angefaste) Flansche für eine saubere Strömungsführung und eine einfache Auskleidung sind mit 72 bezeichnet.The dispersion zone to be designed is designated 71. Machined (chamfered) flanges on the inside edge for a clean flow and a simple lining are marked with 72.

Schließlich ist noch an die Innenwand des Aus- trittsstutzens 57 ein auswechselbares Schutzrohr 73 als Verschleißteil angelegt und kann ein entsprechendes auswechselbares Schutzrohr 74 an die Innenwand der Austrittskammer 58 angelegt sein.Finally, an interchangeable protective tube 73 is placed as a wear part on the inner wall of the outlet connector 57 and a corresponding interchangeable protective tube 74 can be placed on the inner wall of the outlet chamber 58.

Zu Beginn des Betriebs des Sichters im dargestellten Betriebszustand wird über die Sichtlufteintrittsspirale 67 Sichtluft in den Windsichter unter einem Druckgefälle und mit einer zweckentsprechend gewählten Eintrittsgeschwindigkeit eingeführt. Infolge der Einführung der Sichtluft mittels einer Spirale insbesondere in Verbindung mit der Konizität des Teilgehäuses 47 steigt die Sichtluft spiralförmig nach oben in den Bereich des Sichtrads 1-3. Gleichzeitig wird das "Produkt" aus Feststoffpartikeln unterschiedlicher Masse über den Produktaufgabestutzen 56 in das Sichtergehäuse eingegeben. Von diesem Produkt gelangt das Grobgut, d.h. der Partikelanteil mit größerer Masse entgegen der Sichtluft in den Bereich des Grobgutaustrags 68 und wird zur Weiterverarbeitung bereitgestellt. Das Feingut, d.h. der Partikelanteil mit geringerer Masse wird mit der Sichtluft vermischt, gelangt von außen nach innen radial durch das Sichtrad in den Austrittsstutzen 57, in die Austrittskammer 58 und schließlich über das Feingutaustrittsrohr 65 in den Feingutaustritt, sowie von dort in ein Filter, in dem Luft und Feingut voneinander getrennt werden. Gröbere Feingutbestandteile werden aus dem Sichtrad radial herausgeschleudert und dem Grobgut zugemischt, um das Gehäuse mit dem Grobgut zu verlassen oder so lange im Sichtergehäuse zu kreisen, bis es zu Feingut einer solchen Körnung geworden ist, daß es mit der Sichtluft ausgetragen wird.At the beginning of the operation of the classifier in the operating state shown, classifying air is introduced via the classifying air inlet spiral 67 into the classifier under a pressure drop and at an appropriately selected entry speed. As a result of the introduction of the classifying air by means of a spiral, in particular in connection with the taper of the partial housing 47, the classifying air rises spirally upwards into the region of the classifying wheel 1-3. At the same time, the "product" consisting of solid particles of different masses is fed into the classifier housing via the product feed port 56. The coarse material comes from this product, i.e. the proportion of particles with greater mass against the classifying air in the area of the coarse material discharge 68 and is made available for further processing. The fines, i.e. the particle fraction with a lower mass is mixed with the classifying air, reaches radially from the outside inwards through the classifying wheel into the outlet port 57, into the outlet chamber 58 and finally via the fine material outlet pipe 65 into the fine material outlet, and from there into a filter in which air and Fines are separated from each other. Coarser fine material components are thrown radially out of the classifying wheel and mixed with the coarse material in order to leave the housing with the coarse material or to rotate in the classifier housing until it has become a fine material of such a grain that it is discharged with the classifying air.

Infolge der abrupten Querschnittserweiterung vom Austrittsstutzen 57 zur Austrittskammer 58 findet dort eine deutliche Verringerung der Strömungsgeschwindigkeit des Feingut-Luft-Gemisches statt. Dieses Gemisch wird also mit sehr geringer Strömungsgeschwindigkeit in den Feingutauslaß gelangen und auf diesem Weg nur in geringem Maße Abrieb erzeugen. Deswegen ist das Schutzrohr 74 auch nur eine höchst vorsorgliche Maßnahme. Die aus Gründen einer guten Trenntechnik hohe Strömungsgeschwindigkeit im Sichtrad herrscht jedoch noch im Austragstutzen 57, weshalb das Schutzrohr 73 als erfindungswesentlicher angesehen wird. Erfindungswesentlich ist der Durchmessersprung mit einer Durchmessererweiterung beim Übergang vom Austrittstutzen 57 in die Austrittskammer 58.As a result of the abrupt cross-sectional widening from the outlet connection 57 to the outlet chamber 58, there is a significant reduction in the flow velocity of the fine material / air mixture. This mixture will therefore reach the fine material outlet at a very low flow rate and will only produce a small amount of abrasion in this way. For this reason, the protective tube 74 is only a highly precautionary measure. However, for reasons of good separation technology, the high flow velocity in the classifying wheel still prevails in the discharge nozzle 57, which is why the protective tube 73 is considered to be more essential to the invention. Essential to the invention is the increase in diameter with an increase in diameter during the transition from the outlet nozzle 57 into the outlet chamber 58.

Im übrigen kann der Sichter durch die Unterteilung des Sichtergehäuses in der beschriebenen Weise und die Zuordnung der Sichterkomponenten zu den einzelnen Teilgehäusen wiederum gut gewartet werden und schadhaft gewordene Komponenten können mit relativ geringem Aufwand und innerhalb kurzer Wartungszeiten ausgewechselt werden.In addition, the classifier can in turn be well maintained by dividing the classifier housing in the manner described and assigning the classifier components to the individual partial housings, and components which have become defective can be replaced with relatively little effort and within short maintenance times.

Während in den Gesamtanordnungen gemäß Fig. 1,2 das Sichtrad mit den beiden Deckscheiben 1,2 und dem zwischen diesen angeordneten Schaufelkranz 3 noch in bereits bekannter, üblicher Form mit parallelen und parallelflächigen Deckscheiben dargestellt ist, ist in Fig. 3 das Sichtrad für den erfindungsgemäß ausgestalteten Windsichter dargestellt.While the sight wheel with the two cover disks 1, 2 and the blade ring 3 arranged between them is shown in the overall arrangements according to FIG. 1, in a known, conventional form with parallel and parallel-area cover disks, the sight wheel is shown in FIG. 3 shown for the air classifier designed according to the invention.

Die abströmseitige Deckscheibe 1 ist unverändert eben und in einer Ebene angeordnet, die senkrecht zur Drehachse 4 des Sichtrades und der Längsachse des Sichters verläuft, unabhängig davon ob die Dreh- und Längsachse 4 senkrecht steht oder horizontal verläuft. Sie umschließt konzentrisch den Austrittsstutzen 5. Von der abströmseitigen Deckscheibe 1 sind von dieser aus die Schaufeln 3 auf die zweite Deckscheibe 2 gerichtet. Mit beiden Deckscheiben 1,2 sind die Schaufeln 3 verbunden. Die untere Deckscheibe 2 ist nun abweichend vom Stand der Technik konisch ausgebildet und war vorzugsweise derart, daß der Abstand der zweiten Deckscheibe 2 von der abströmseitigen Deckscheibe 1 vom Kranz der Schaufeln 3 nach innen größer wird und zwar nochmals vorzugsweise kontinuierlich und nochmals vorzugsweise so, daß die Fläche des durchströmten Zylindermantels für jeden Radius zwischen Schaufelaustrittskanten und Austrittsstutzen 5 konstant bleibt. Die infolge des kleiner werdenden Radius bei bekannten Lösungen geringer werdende Abströmgeschwindigkeit bleibt bei dieser Lösung konstant.The outflow-side cover plate 1 is still flat and is arranged in a plane which is perpendicular to the axis of rotation 4 of the classifying wheel and the longitudinal axis of the classifier, regardless of whether the axis of rotation and longitudinal axis 4 is vertical or horizontal. It concentrically surrounds the outlet nozzle 5. From the cover disk 1 on the outflow side, the blades 3 are directed from there toward the second cover disk 2. The blades 3 are connected to both cover disks 1, 2. The lower cover plate 2 is now conical, in contrast to the prior art, and was preferably such that the distance between the second cover plate 2 and the outflow-side cover plate 1 from the rim of the blades 3 increases, preferably again continuously and preferably so that the area of the flow through the cylinder jacket remains constant for each radius between the blade outlet edges and outlet nozzle 5. The outflow velocity, which decreases due to the decreasing radius in known solutions, remains constant with this solution.

Daß das Sichtrad 1 bis 3 sowohl bei der Windsichterausbildung gemäß Fig. 1 als auch bei der Windsichterausbildung gemäß Fig. 2 wie in Fig. 3 dargestellt ausgebildet sein kann, bedarf keiner besonderen Erläuterung. Es ist lediglich zu bedenken, daß im Fall des Sichters gemäß Fig. 1 das Sichtrad wie in Fig. 3 dargestellt eingebaut ist ("abströmseitige, obere Deckscheibe" ist die Scheibe 1) während bei dem Sichter gemäß Fig. 2 das Sichtrad gegenüber der Darstellung in Fig. 3 um 180 gedreht eingebaut ist (die "abströmseitige Deckscheibe" 1 ist im Einbauzustand die untere Deckscheibe).The fact that the classifying wheel 1 to 3 can be configured as shown in FIG. 3 both in the classifier design according to FIG. 1 and in the classifier design according to FIG. 2 requires no special explanation. It is only to be considered that in the case of the classifier according to FIG. 1, the classifying wheel is installed as shown in FIG. 3 ("outflow-side, upper cover plate" is class 1), while in the classifier according to FIG. 2 the classifying wheel is compared to the illustration 3 is installed rotated by 180 (the "outflow-side cover plate" 1 is the lower cover plate in the installed state).

Um zu erläutern, daß die Verbindung zwischen abströmseitiger Deckscheibe (obere Deckscheibe 1 in Fig. 1 bzw. untere Deckscheibe 2 in Fig. 2) und Austrittsstutzen 18 (Fig. 1) bzw. 20 (Fig. 2) auch bei der Sichterausbildung gemäß Fig. 2 so ausgebildet sein kann, wie bei der Sichteran-ordnung gemaß Fig. 1 dargestellt, ausgebildet sein kann, hat man sich vorzustellen, daß Austrittsstutzen 57 und Austrittskammer 58 drehfest mit der unteren Deckscheibe 2 des Sichtrads verbunden und die Arme 61 von dem Ringge-häuse 62 so beabstandet sind, daß Drehbewegungen des Aus-trittsstutzens 57 und der Austrittskammer 58 zusammen mit dem Sichtrad 1-3 möglich sind, wobei ein Ringlager zentrierende Funktion haben kann. Entsprechend dem Umlauf von Austrittsstutzen 57 und Austrittskammer 58 muß die bauliche Verbindung zwischen Austrittskammer 58 und Fein-gutaustragrohr 65 aufgehoben sein, ohne den Strömungs-mittelübertritt zu beeinträchtigen.To explain that the connection between the downstream cover plate (upper cover plate 1 in FIG. 1 or lower cover plate 2 in FIG. 2) and outlet connection 18 (FIG. 1) or 20 (FIG. 2) also in the classifier design according to FIG 2 can be designed as shown in the classifier arrangement shown in FIG. 1, one has to imagine that the outlet connection 57 and the outlet chamber 58 are connected in a rotationally fixed manner to the lower cover plate 2 of the classifier wheel and the arms 61 are removed from the ring -housing 62 are spaced so that rotational movements of the outlet nozzle 57 and the outlet chamber 58 are possible together with the classifying wheel 1-3, whereby a ring bearing can have a centering function. Corresponding to the circulation of the outlet connection 57 and the outlet chamber 58, the structural connection between the outlet chamber 58 and the fine material discharge pipe 65 must be removed without impairing the flow medium transfer.

Um zu erläutern, daß die Ausbildung der Abströmung mit dem Querschnittssprung gemäß Fig. 2 auch bei dem Windsichter gemäß Fig. 1 vorgesehen sein kann, ist Fig. 1 eine Fig. 4 zugehörig, die diesen Bereich größer darstellt. Der Austrittsstutzen 5 mündet zunächst wie in Fig. 1 in den Rohrabschnitt 18, der jedoch noch im Bereich des Lagers 20 eine deutliche, kammerartige Querschnittserweiterung aufweist.In order to explain that the formation of the outflow with the cross-sectional jump according to FIG. 2 can also be provided in the air classifier according to FIG. 1, FIG. 1 belongs to FIG. 4, which shows this area larger. The outlet connection 5 initially opens as in FIG. 1 into the tube section 18, which, however, still has a clear, chamber-like cross-sectional widening in the region of the bearing 20.

Claims (26)

1. Vorzugsweise vertikaler Windsichter mit einem entgegen der Fliehkraft radial von außen nach innen von der feingutbeladenen Sichtluft angeströmten rotierenden Sichtrad, aus dem diese Sichtluft axial durch einen Austrittsstutzen ab strömt, um einer Weiterverwertung z.B. in einem Filter o. dgl. zugeführt zu werden, wobei das Sichtrad eine abströmseitige und eine axial dazu versetzte, zweite Deckscheibe sowie zwischen den Deckscheiben an deren Außenumfang angeordnete Schaufeln aufweist, dadurch gekennzeichnet, daß der vom Sichtrad (11) wegführende Austrittsstutzen (20) in eine Austrittskammer (21) mündet, deren Querschnitt deutlich größer ist als der Querschnitt des Austrittsstutzens, so daß zwischen Austrittsstutzen und Austrittskammer ein Querschnittssprung vorliegt.1. Preferably a vertical air classifier with a rotating classifying wheel which flows against the centrifugal force radially from the outside inwards from the fine material-laden classifying air and from which this classifying air flows axially through an outlet nozzle in order to be used e.g. to be supplied in a filter or the like, the separating wheel having a downstream cover plate and an axially offset second cover plate and blades arranged between the cover plates on their outer circumference, characterized in that the outlet connection piece (20) leading away from the separating wheel (11) opens into an outlet chamber (21), the cross section of which is significantly larger than the cross section of the outlet connector, so that there is a cross-sectional jump between the outlet connector and the outlet chamber. 2. Windsichter nach Anspruch 1, dadurch gekennzeichnet, daß der Durchmesser der Austrittskammer (21) im Bereich der Einmündung des Austrittsstutzens (20) in die Austrittskammer mindestens doppelt so groß ist wie der Querschnitt des Austrittsstutzens im Bereich der Einmündung in die Austrittskammer.2. Air classifier according to claim 1, characterized in that the diameter of the outlet chamber (21) in the region of the mouth of the outlet nozzle (20) in the outlet chamber is at least twice as large as the cross section of the outlet nozzle in the region of the mouth into the outlet chamber. 3. Windsichter nach Anspruch 2, dadurch gekennzeichnet, daß unterschiedliche Querschnitte von Austrittsstutzen (20) und Austrittskammer (21) gleiche Kontur haben und gleichachsig angeordnet sind.3. Air classifier according to claim 2, characterized in that different cross sections of the outlet nozzle (20) and outlet chamber (21) have the same contour and are arranged coaxially. 4. Windsichter nach Anspruch 3, dadurch gekennzeichnet, daß die beiden Querschnitte rund sind.4. Air classifier according to claim 3, characterized in that the two cross sections are round. 5. Windsichter nach Anspruch 4, dadurch gekennzeichnet, daß der rohrförmige Austrittsstutzen (20) mit einem Schutzrohr (36) ausgekleidet ist.5. Air classifier according to claim 4, characterized in that the tubular outlet connector (20) is lined with a protective tube (36). 6. Windsichter nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß Austrittsstutzen (20) und Austrittskammer (21) eine Baueinheit bilden, die unterhalb des Sichtrads (11) im Sichtergehäuse (1,2,6,7,18) gehalten ist.6. Air classifier according to one of claims 1 to 5, characterized in that the outlet nozzle (20) and outlet chamber (21) form a structural unit which is below the classifying wheel (11) is held in the classifier housing (1,2,6,7,18). 7. Windsichter nach Anspruch 6, dadurch gekennzeichnet, daß zwischen dem dem Sichtrad (11) zugekehrten Ende des Austrittsstutzens (20) und der dem Austrittsstutzen zugeordneten Drehscheibe (13) des Sichtsrads (11) ein definierter, vorzugsweise einstellbarer Spalt vorliegt, durch den radial nach außen Spülluft ins Sichtergehäuse (1,2,6,7,18) eingeleitet wird.7. Air classifier according to claim 6, characterized in that there is a defined, preferably adjustable gap through the radial between the classifying wheel (11) facing the end of the outlet port (20) and the turntable assigned to the turntable (13) of the classifying wheel (11) purge air is introduced into the classifier housing (1, 2, 6, 7, 18). 8. Windsichter nach Anspruch 7, dadurch gekennzeichnet, daß die Spülluft in den Spalt aus einer den Austrittsstutzen (20) konzentrisch umgebenden Ringkammer (25) eingeführt wird.8. Air classifier according to claim 7, characterized in that the purge air is introduced into the gap from an annular outlet (25) concentrically surrounding the outlet port (20). 9. Windsichter nach Anspruch 8, dadurch gekennzeichnet, daß die Ringkammer (25) konisch ist, der Baueinheit aus Austrittsstutzen (20) und Austrittskammer (21) zugeordnet ist und mit ihrem größeren Durchmesser zumindest etwa dem Durchmesser der Austrittskammer, mit ihrem kleineren Durchmesser zumindest etwa dem Außendurchmesser des Sichtrads entspricht.9. Air classifier according to claim 8, characterized in that the annular chamber (25) is conical, the assembly of the outlet nozzle (20) and outlet chamber (21) is assigned and with its larger diameter at least approximately the diameter of the outlet chamber, at least with its smaller diameter corresponds approximately to the outer diameter of the classifying wheel. 10. Windsichter nach Anspruch 9, dadurch gekennzeichnet, daß die Baueinheit aus Austrittsstutzen (20), Austrittskammer (21) und Ringkammer (25) durch einen Stern radialer Stege (24) im Sichtergehäuse (1,2,6,7,18) gehalten ist.10. Air classifier according to claim 9, characterized in that the structural unit comprising the outlet nozzle (20), outlet chamber (21) and annular chamber (25) is held in the classifier housing (1, 2, 6, 7, 18) by a star of radial webs (24) is. 11. Windsichter nach Anspruch 10, dadurch gekennzeichnet, daß zumindest einer der Stege (24), vorzugsweise alle Stege des Sterns, hohl ausgebildet sind und der Zuführung der Spülluft zur Ringkammer (25) dienen.11. Air classifier according to claim 10, characterized in that at least one of the webs (24), preferably all webs of the star, are hollow and serve to supply the purge air to the annular chamber (25). 12. Windsichter nach Anspruch 11, dadurch gekennzeichnet, daß die der Spülluftführung dienenden Stege (24) als Rohre mit rundem Querschnitt ausgebildet sind.12. Air classifier according to claim 11, characterized in that the webs (24) serving to purge the air are constructed as tubes with a round cross-section. 13. Windsichter nach einem der Ansprüche 1 bis 12 in vertikaler Anordnung, gekennzeichnet durch ein zweiteiliges Sichtergehäuse (1,2,6,7,18), wobei das Gehäuseoberteil (1) aufklappbar dem Gehäuseunterteil (2) zugeordnet ist.13. Air classifier according to one of claims 1 to 12 in a vertical arrangement, characterized by a two-part classifier housing (1, 2, 6, 7, 18), the upper housing part (1) being assigned to the lower housing part (2) in a hinged manner. 14. Windsichter nach Anspruch 13, dadurch gekennzeichnet, daß Gehäuseoberteil (1) und Gehäuseunterteil (2) mit Ringflanschen (8,9) aneinanderliegen, die in einem Scharnier (5) dauerhaft, mit lösbaren Verbindungsmitteln lösbar miteinander verbunden sind.14. Air classifier according to claim 13, characterized in that the upper housing part (1) and lower housing part (2) with ring flanges (8,9) lie against each other, which are permanently connected to one another in a hinge (5) with releasable connecting means. 15. Windsichter nach Anspruch 13 oder 14, dadurch gekennzeichnet, daß das Sichtrad (11) mit seiner fliegend ausgebildeten Lagerung im Gehäuseoberteil (1), der Austrittsstutzen (20) sowie die Austrittskammer (21) und gegebenenfalls die Baueinheit aus diesen beiden Teilen und der Ringkammer (25) im Gehäuseunterteil (2) angeordnet sind, und der Produktaufgabestutzen (1 a) parallel zur Drehachse des Sichtrads dem Gehäuseoberteil zugeordnet ist.15. Air classifier according to claim 13 or 14, characterized in that the classifying wheel (11) with its overhung bearing in the upper housing part (1), the outlet port (20) and the outlet chamber (21) and optionally the structural unit from these two parts and Annular chamber (25) are arranged in the lower housing part (2), and the product feed port (1 a) is assigned to the upper housing part parallel to the axis of rotation of the classifying wheel. 16. Windsichter nach einem der Ansprüche 1 bis 15, dadurch gekennzeichnet, daß das Feingut die Austrittskammer (21) über ein tangential an die Austrittskammer (21) herangeführtes Feingutaustrittsrohr (28) verläßt, um das Sichtergehäuse in tangentialer Richtung zu verlassen.16. Air classifier according to one of claims 1 to 15, characterized in that the fine material leaves the outlet chamber (21) via a tangential to the outlet chamber (21) brought into the fine material outlet pipe (28) in order to leave the classifier housing in the tangential direction. 17. Windsichter nach Anspruch 16, dadurch gekennzeichnet, daß das Feingutaustrittsrohr (28) im Bereich unmittelbar über dem Boden (23) der Austrittskammer (21) in diese mündet, wobei der Boden als demontierbarer Deckel ausgebildet ist.17. Air classifier according to claim 16, characterized in that the fine material outlet pipe (28) opens into the area directly above the bottom (23) of the outlet chamber (21), the bottom being designed as a removable cover. 18. Windsichter nach einem der Ansprüche 13 bis 17, dadurch gekennzeichnet, daß das Gehäuseunterteil (2) zweiteilig ausgebildet ist (Teile 6,7), wobei der zylindrische obere Gehäuseabschnitt (6) als das Sichtraumgehäuse und der sich kegelförmig nach unten verjüngende untere Gehäuseabschnitt (7) mittels Flanschen (8,9) unmittelbar unterhalb der Ebene lösbar miteinander verbunden sind, in der die zylindrische Austrittskammer (21) endet, wobei dem oberen Gehäuseabschnitt (6) der Feingutaustrag (28) und dem unteren Ende des unteren Gehäuseabschnitts (7) abnehmbar der Grobgutaustrag (31) sowie der Sichtlufteintritt (30) zugeordnet sind.18. Air classifier according to one of claims 13 to 17, characterized in that the lower housing part (2) is formed in two parts (parts 6, 7), the cylindrical upper housing section (6) as the viewing space housing and the conically tapering lower housing section (7) are detachably connected to one another by means of flanges (8, 9) immediately below the plane in which the cylindrical outlet chamber (21) ends, the fine housing discharge (28) for the upper housing section (6) and the lower end of the lower housing section (7 ) are removably assigned to the coarse material discharge (31) and the visible air inlet (30). 19. Windsichter nach Anspruch 18, dadurch gekennzeichnet, daß der Sichtlufteintritt (30) eine Sichtlufteintrittsspirale oberhalb des Grobgutaustrags (31) ist, deren Drehrichtung der Umlaufrichtung des Sichtrads (11) verläuft.19. Air classifier according to claim 18, characterized in that the sight air inlet (30) is a sight air inlet spiral above the coarse material discharge (31), the direction of rotation of which is the direction of rotation of the classifying wheel (11). 20. Windsichter nach Anspruch 18, dadurch gekennzeichnet, daß der Sichter mit seinem Gehäuse (1,2,6,7,18) an Tragarmen (10) aufgehängt ist, die im Bereich des zylindrischen, oberen Abschnitts (6) des Gehäuseunterteils (2) an das Sichtergehäuse herangeführt und auf den Umfang des Sichtergehäuses verteilt sind.20. Air classifier according to claim 18, characterized in that the classifier is suspended with its housing (1, 2, 6, 7, 18) on support arms (10) which are in the region of the cylindrical, upper section (6) of the lower housing part (2nd ) brought up to the classifier housing and distributed over the circumference of the classifier housing. 21. Windsichter mit einem entgegen der Fliehkraft radial von außen nach innen von der feingutbeladenen Sichtluft angeströmten rotierenden Sichtrad, aus dem diese Sichtluft axial durch einen Austrittsstutzen abströmt und das eine abströmseitige Deckscheibe, eine axial dazu versetzt angeordnete, zweite Deckscheibe und dazwischen am Umfang angeordnete Schaufeln aufweist, vorzugsweise nach einem der Ansprüche 1 bis 20, dadurch gekennzeichnet, daß die lichte Höhe zwischen abströmseitiger Deckscheibe (1) und zweiter Deckscheibe (2) von den Austrittskanten der Schaufeln (3) zum Austrittsstutzen (5) sich verändert.21.A wind sifter with a rotating classifying wheel which flows against the centrifugal force radially from the outside inwards from the fine material-laden classifying air, from which this classifying air flows axially through an outlet connection and which has a cover plate on the outflow side, a second cover plate arranged axially offset thereto and blades arranged in between on the circumference , preferably according to one of claims 1 to 20, characterized in that the clear height between the outflow-side cover plate (1) and the second cover plate (2) changes from the outlet edges of the blades (3) to the outlet nozzle (5). 22. Windsichter nach Anspruch 21, dadurch gekennzeichnet, daß die Veränderung eine Zunahme ist.22. Air classifier according to claim 21, characterized in that the change is an increase. 23. Windsichter nach Anspruch 21 oder 22, dadurch gekennzeichnet, daß die Zunahme stetig ist.23. Air classifier according to claim 21 or 22, characterized in that the increase is steady. 24. Windsichter nach Anspruch 23, dadurch gekennzeichnet, daß die Zunahme für jeden Radius zwischen Schaufelaustrittskanten und Austrittsstutzen (5) konstant bleibt.24. Air classifier according to claim 23, characterized in that the increase for each radius between the blade trailing edges and the outlet connection (5) remains constant. 25. Windsichter mit einem entgegen der Fliehkraft radial von außen nach innen von der feingutbeladenen Sichtluft angeströmten rotierenden Sichtrad, aus dem diese Sichtluft axial durch einen Austrittsstutzen abströmt und das eine abströmseitige Deckscheibe, eine axial dazu versetzt angeordnete, zweite Deckscheibe und dazwischen am Umfang angeordnete Schaufeln aufweist, nach einem der Ansprüche 1 bis 24, dadurch gekennzeichnet, daß der Austrittsstutzen (5,6,18) mit einem Tauchrohrabschnitt (5,6) bis in die abströmseitige Deckscheibe (1) hineingeführt und mit dieser drehfest verbunden ist.25.A wind sifter with a rotating classifying wheel which flows against the centrifugal force radially from the outside inward from the fine material-laden classifying air and from which this classifying air flows axially through an outlet connection and which has a cover plate on the outflow side, a second cover plate arranged axially offset thereto and vanes arranged in between on the circumference according to one of claims 1 to 24, characterized in that the outlet connection (5, 6, 18) with a dip tube section (5, 6) is inserted into the outflow-side cover plate (1) and is connected to it in a rotationally fixed manner. 26. Windsichter nach Anspruch 25, dadurch gekennzeichnet, daß der Austrittsstutzen (5,6,18) zwischen mit ihm verbundener Deckscheibe (1) und Austrittskammer (kammerartige Erweiterung des Austrittsstutzens gemäß Fig. 4) einen Abschnitt (5) aufweist, in dem sich der Querschnitt des Tauchrohres stetig erweitert.26. Air classifier according to claim 25, characterized in that the outlet connection (5, 6, 18) between the cover disk (1) connected to it and the outlet chamber (chamber-like extension of the outlet connection according to FIG. 4) has a section (5) in which the cross-section of the dip tube is constantly expanding.
EP91112707A 1990-08-01 1991-07-29 Pneumatic classifier, preferably a vertical one Expired - Lifetime EP0472930B1 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE4024440 1990-08-01
DE4024440A DE4024440A1 (en) 1990-08-01 1990-08-01 Vertical winnowing machine impeller with curved vanes - has step formed between impeller outlet duct and outlet chamber
DE4025247 1990-08-09
DE4025247A DE4025247A1 (en) 1990-08-09 1990-08-09 Turbine-type air sifter - has lower end plate of rotor dished so that distance between end plates increases towards centre
US07/900,310 US5244481A (en) 1990-08-01 1992-06-18 Preferably vertical air separator

Publications (3)

Publication Number Publication Date
EP0472930A2 true EP0472930A2 (en) 1992-03-04
EP0472930A3 EP0472930A3 (en) 1992-10-21
EP0472930B1 EP0472930B1 (en) 1996-10-16

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP91112707A Expired - Lifetime EP0472930B1 (en) 1990-08-01 1991-07-29 Pneumatic classifier, preferably a vertical one

Country Status (6)

Country Link
US (1) US5252110A (en)
EP (1) EP0472930B1 (en)
JP (1) JP3326188B2 (en)
AT (1) ATE144169T1 (en)
DE (1) DE59108284D1 (en)
ES (1) ES2093052T3 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0691159A1 (en) * 1994-07-06 1996-01-10 Loesche Gmbh Classifier for grinding mills
CN1054318C (en) * 1994-11-23 2000-07-12 李俊治 Air-flow grading machine
WO2007131502A1 (en) * 2006-05-17 2007-11-22 Netzsch-Condux Mahltechnik Gmbh Method for producing very fine particles by means of a jet mill
WO2008046404A1 (en) * 2006-10-16 2008-04-24 Netzsch-Condux Mahltechnik Gmbh Method for producing very fine particles and jet mill therefor and wind separator and operating method thereof
WO2008046403A1 (en) * 2006-10-16 2008-04-24 Netzsch-Condux Mahltechnik Gmbh Method for producing very fine particles and jet mills therefor, air separator and method for the operation thereof
EP2218703A1 (en) 2009-02-13 2010-08-18 Evonik Degussa GmbH A thermal insulation material comprising precipitated silica
US8177149B2 (en) 2006-04-13 2012-05-15 Roland Nied Method for the production of very fine particles by means of a jet mill
US8864056B2 (en) 2009-09-29 2014-10-21 Evonik Degussa Gmbh Low-pressure milling process

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006048850A1 (en) * 2006-10-16 2008-04-17 Evonik Degussa Gmbh Amorphous submicron particles
DE102007052269A1 (en) 2007-11-02 2009-05-07 Evonik Degussa Gmbh Precipitated silicic acids for storage-stable RTV-1 silicone rubber formulations without stabilizer
DE102017209874A1 (en) 2017-06-12 2018-12-13 Evonik Degussa Gmbh Process for the preparation of wax-coated silica
CN110479593A (en) * 2019-09-05 2019-11-22 贵州省机电研究设计院 A kind of tea-leaf wind selection equipment

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US2968401A (en) * 1956-09-05 1961-01-17 American Marietta Co Air classifier
US3237766A (en) * 1960-10-21 1966-03-01 Ass Portland Cement Mechanical air classifier
GB1075005A (en) * 1964-12-11 1967-07-05 Ass Portland Cement Improvements in or relating to centrifugal air classifiers
DE1507706A1 (en) * 1966-01-11 1969-07-17 Isler Dipl Ing Walter Spreader sifter with circulating air fan
EP0159766A2 (en) * 1984-03-13 1985-10-30 Hosokawa Micron International Inc. Particulate classifying apparatus
EP0195240A2 (en) * 1985-03-13 1986-09-24 Alpine Aktiengesellschaft Pneumatic classifier with a wear-resisting classifying rotor
DE3638915A1 (en) * 1985-12-31 1987-07-02 Thaelmann Schwermaschbau Veb Centrifugal air classifier
DE3814458A1 (en) * 1988-04-28 1989-11-09 Krupp Polysius Ag Air separator
EP0369399A2 (en) * 1988-11-17 1990-05-23 Roland Dr.-Ing. Nied Wind sifter

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FR2625925B1 (en) * 1988-01-18 1991-11-15 Onoda Cement Co Ltd POWDER SORTING DEVICE

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Publication number Priority date Publication date Assignee Title
US2968401A (en) * 1956-09-05 1961-01-17 American Marietta Co Air classifier
US3237766A (en) * 1960-10-21 1966-03-01 Ass Portland Cement Mechanical air classifier
GB1075005A (en) * 1964-12-11 1967-07-05 Ass Portland Cement Improvements in or relating to centrifugal air classifiers
DE1507706A1 (en) * 1966-01-11 1969-07-17 Isler Dipl Ing Walter Spreader sifter with circulating air fan
EP0159766A2 (en) * 1984-03-13 1985-10-30 Hosokawa Micron International Inc. Particulate classifying apparatus
EP0195240A2 (en) * 1985-03-13 1986-09-24 Alpine Aktiengesellschaft Pneumatic classifier with a wear-resisting classifying rotor
DE3638915A1 (en) * 1985-12-31 1987-07-02 Thaelmann Schwermaschbau Veb Centrifugal air classifier
DE3814458A1 (en) * 1988-04-28 1989-11-09 Krupp Polysius Ag Air separator
EP0369399A2 (en) * 1988-11-17 1990-05-23 Roland Dr.-Ing. Nied Wind sifter

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0691159A1 (en) * 1994-07-06 1996-01-10 Loesche Gmbh Classifier for grinding mills
CN1054318C (en) * 1994-11-23 2000-07-12 李俊治 Air-flow grading machine
US8177149B2 (en) 2006-04-13 2012-05-15 Roland Nied Method for the production of very fine particles by means of a jet mill
US8047458B2 (en) 2006-05-17 2011-11-01 Roland Nied Method for producing very fine particles by means of a jet mill
WO2007131502A1 (en) * 2006-05-17 2007-11-22 Netzsch-Condux Mahltechnik Gmbh Method for producing very fine particles by means of a jet mill
US8074907B2 (en) 2006-10-16 2011-12-13 Roland Nied Method for generating finest particles and jet mill therefor as well as classifier and operating method thereof
US7866582B2 (en) 2006-10-16 2011-01-11 Netzsch-Condux Mahltechnik Gmbh Method for generating finest particles and jet mill therefor as well as classifier and operating method thereof
WO2008046403A1 (en) * 2006-10-16 2008-04-24 Netzsch-Condux Mahltechnik Gmbh Method for producing very fine particles and jet mills therefor, air separator and method for the operation thereof
WO2008046404A1 (en) * 2006-10-16 2008-04-24 Netzsch-Condux Mahltechnik Gmbh Method for producing very fine particles and jet mill therefor and wind separator and operating method thereof
EP2959975A1 (en) * 2006-10-16 2015-12-30 Nied, Roland, Dr.-Ing. Method for producing very fine particles with a jet mill and jet mill for same
WO2010091921A2 (en) 2009-02-13 2010-08-19 Evonik Degussa Gmbh A thermal insulation material comprising precipitated silica
EP2218703A1 (en) 2009-02-13 2010-08-18 Evonik Degussa GmbH A thermal insulation material comprising precipitated silica
US8864056B2 (en) 2009-09-29 2014-10-21 Evonik Degussa Gmbh Low-pressure milling process

Also Published As

Publication number Publication date
ATE144169T1 (en) 1996-11-15
EP0472930B1 (en) 1996-10-16
ES2093052T3 (en) 1996-12-16
DE59108284D1 (en) 1996-11-21
US5252110A (en) 1993-10-12
JPH04227092A (en) 1992-08-17
JP3326188B2 (en) 2002-09-17
EP0472930A3 (en) 1992-10-21

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