EP0546458A1 - Classifying rotor for a centrifugal pneumatic separator - Google Patents

Classifying rotor for a centrifugal pneumatic separator Download PDF

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Publication number
EP0546458A1
EP0546458A1 EP92120687A EP92120687A EP0546458A1 EP 0546458 A1 EP0546458 A1 EP 0546458A1 EP 92120687 A EP92120687 A EP 92120687A EP 92120687 A EP92120687 A EP 92120687A EP 0546458 A1 EP0546458 A1 EP 0546458A1
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EP
European Patent Office
Prior art keywords
wheel
classifying
classifying wheel
blades
hub
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.)
Withdrawn
Application number
EP92120687A
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German (de)
French (fr)
Inventor
Georg Dipl.-Ing. Schumacher (Fh)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hosokawa Alpine AG
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Alpine AG
Hosokawa Alpine AG
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Publication date
Application filed by Alpine AG, Hosokawa Alpine AG filed Critical Alpine AG
Publication of EP0546458A1 publication Critical patent/EP0546458A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
    • F04D29/282—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers the leading edge of each vane being substantially parallel to the rotation axis
    • F04D29/283—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers the leading edge of each vane being substantially parallel to the rotation axis rotors of the squirrel-cage type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/289—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps having provision against erosion or for dust-separation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2230/00—Manufacture
    • F05B2230/20—Manufacture essentially without removing material
    • F05B2230/22—Manufacture essentially without removing material by sintering

Definitions

  • the invention relates to a wind classifier with the classifying air flowing through it from the outside inward against the direction of its centrifugal rotation, with ring-shaped blades that run parallel to the axis of rotation and are arranged between a circular disk carrying the classifying wheel hub and an annular cover disk. It relates to a classifying wheel for such an air classifier with blades made of a wear-resistant sintered material.
  • a classifying wheel of the required type has become known, for example, from DE-C 35 08 889.
  • An air classifier is described there, in the classifying wheel of which the blades, which are made entirely of a wear-resistant sintered material, are inserted into the recesses of a circular disk carrying the classifying wheel hub on the one hand and an annular cover plate on the other hand with axial play and are inserted into the recesses from a rubber-elastic, wear-resistant material mutual position are fixed and radially supported against circular disc or cover disc.
  • This air classifier high-purity substances, in which even the slightest contamination, e.g. due to abrasion on well-touched surfaces, which make the product unusable, can be processed without wear or abrasion. Even with heavily abrasive fabrics with a Mohs hardness of 4 or more, wear-free and therefore economical operation of the air classifier is possible.
  • classifying wheels with blades made of sintered material are not quite as stiff in design as those made entirely of steel, so that they operate without changing the design of the seal between classifying wheel and suction pipe for the fine material at only about 80% of the maximum circumferential speed of the classifying wheels made of steel can be.
  • the object of the invention is to avoid these disadvantages.
  • classifying wheel with the features according to claim 1, according to which the classifying wheel bearing the classifying wheel hub, the annular cover plate and the classifying wheel blades arranged therebetween and running parallel to the axis of rotation are produced completely and in one piece from a wear-resistant sintered material.
  • the process measures and devices of sintering technology or powder metallurgy are used for the production of the classifying wheel body.
  • the powdered starting material - ceramic or metallic sintered materials - is shaped together with a binder to form a pressed body, which is converted into the desired final shape by mechanical processing and then sintered.
  • all that is required is a fine machining of the hub bore of the classifying wheel to a finished dimension for a direct seat on the drive shaft, as well as the outer end faces of the circular disk and cover plate of the classifying wheel so that they run exactly perpendicular to its axis of rotation.
  • the molding can be shaped, for example, according to DE-C 469 805, which describes methods and pressing devices by means of which a compact body as complex as the classifying wheel body can be produced with a uniform density.
  • a pump impeller to cut the individual impeller blades together with parts of the cover disks axially delimiting the flow channels as a coherent blade element made of a refractory and wear-resistant material (examples of which are tungsten carbide or aluminum oxide) Shaping machining before sintering. After sintering, the individual blade elements are assembled to form the impeller and this is stretched between two shape-matched metal disks, so that a sandwich-like structure with the necessary strength is produced.
  • the parts made of sintered material are used here only as protection against wear due to the pumped fluid containing a solid. Pure sliding friction occurs here, since the geometry of the blade channels, as with any turbomachine, is designed for flow that is as parallel as possible to the wall.
  • paddlewheel air classifiers of the type considered here, however, completely different flow conditions in the blade channels have to be taken into account.
  • a functionally essential component there is a motor-driven paddle wheel like a pump or a blower, but a blower arranged outside the air classifier creates a flow in the bucket channels of the classifying wheel that is opposite to the flow that occurs when the classifying wheel is operated as Blower wheel would arise, ie the flow in the classifying wheel runs radially inward from its outer circumference, that is to say counter to its direction of rotation. This creates a very strong flow deflection at the blade edges on the wheel circumference, through which only the good particles carried in the classifying air receive a centrifugal acceleration that also determines the classifying process.
  • the sighting process then results from the interaction of the particle centrifugal force and the drag force which the sighting air exerts on the particles.
  • this predominates Towing force, so that they are carried away by the classifying air and discharged as fine material.
  • the centrifugal force predominates, so that they receive a component of motion transversely to the direction of flow of the classifying air, which deflects them outwards and makes them collide with the classifying wheel blades.
  • compact particles are thrown out completely, so that they finally leave the classifier as coarse material. Agglomerates are dissolved in the individual particles and subjected to the screening process again.
  • the blades of the classifying wheel are primarily stressed by impact forces and the wear they cause.
  • an inventive sight wheel is shown in two views and partially in section.
  • the classifying wheel 1, which consists of the circular disk 2 with the hub 3, the cover disk 4 and the blades 5 forming the flow channels 6, is made completely and in one piece from a sintered material.
  • the bore in the hub 3 has a finished size, which allows the sight wheel 1 to be mounted directly onto the drive shaft (not shown).
  • a correspondingly shaped feather key is used for torque transmission, which engages in the groove 7 in the hub 3, which is semicircular in cross section.
  • the radially directed flow channels 6 are formed by surfaces of the blades 5 which run parallel to one another and in the direction of the axis of rotation 8 and which are connected to one another in the transition region to the circular disc 2 or cover disc 4 by an arc surface.
  • the shape of the flow channels 6 can be most easily obtained with the aid of a cylindrical end mill.
  • the enlarged details A and B show the chamfered edges of the blades 5 on the outer circumference of the classifying wheel 1.

Abstract

Beschrieben wird die Gestaltung eines Sichtrades (1) für einen Schaufelrad-Windsichter, d.h. einen Windsichter mit von der Sichtluft entgegen seiner Schleuderrichtung von außen nach innen durchströmten, rotierenden Sichtrad (1) mit kranzförmig angeordneten, parallel zur Drehachse verlaufenden Schaufeln (5), die zwischen einer die Sichtradnabe (3) tragenden Kreisscheibe (2) und einer ringförmigen Deckscheibe (4) angeordnet sind. Das Sichtrad (1) ist vollständig und in einem Stück aus einem verschleißfesten Sinterwerkstoff hergestellt. Die Strömungskanäle (6) des Sichtrades (1) werden durch parallel zueinander und in Richtung der Drehachse verlaufende Flächen der Sichtrad-Schaufeln (5) gebildet. <IMAGE>The design of a classifying wheel (1) for a paddle wheel wind classifier is described, i.e. a wind classifier with rotating classifying wheel (1) through which the classifying air flows in the opposite direction of its centrifugal direction, with blades (5) arranged in a ring and running parallel to the axis of rotation, between a circular disc (2) carrying the classifying wheel hub (3) and an annular cover plate (4) are arranged. The classifying wheel (1) is complete and made in one piece from a wear-resistant sintered material. The flow channels (6) of the classifying wheel (1) are formed by surfaces of the classifying wheel blades (5) running parallel to one another and in the direction of the axis of rotation. <IMAGE>

Description

Die Erfindung bezieht sich auf einen Windsichter mit entgegen seiner Schleuderrichtung von der Sichtluft von außen nach innen durchströmten, rotierenden Sichtrad mit kranzförmig angeordneten, parallel zur Drehachse verlaufenden Schaufeln, die zwischen einer die Sichtradnabe tragenden Kreisscheibe und einer ringförmigen Deckscheibe angeordnet sind. Sie betrifft ein Sichtrad für einen derartigen Windsichter mit Schaufeln aus einem verschleißfesten Sinterwerkstoff.The invention relates to a wind classifier with the classifying air flowing through it from the outside inward against the direction of its centrifugal rotation, with ring-shaped blades that run parallel to the axis of rotation and are arranged between a circular disk carrying the classifying wheel hub and an annular cover disk. It relates to a classifying wheel for such an air classifier with blades made of a wear-resistant sintered material.

Ein Sichtrad der vorausgesetzten Art ist beispielsweise durch die DE-C 35 08 889 bekanntgeworden. Es wird dort ein Windsichter beschrieben, bei dessen Sichtrad die ganz aus einem verschleißfesten Sinterwerkstoff hergestellten Schaufeln in Ausnehmungen einer die Sichtradnabe tragenden Kreisscheibe einerseits und einer ringförmigen Deckscheibe andererseits mit axialem Spiel eingesetzt und durch in die Ausnehmungen eingepaßte Einsätze aus einem gummielastischen, verschleißfesten Material in ihrer gegenseitigen Lage fixiert und gegen Kreisscheibe bzw. Deckscheibe radial abgestützt sind. Mit diesem Windsichter können hochreine Stoffe, bei denen selbst geringste Verunreinigungen, z.B. durch Abrieb an gutberührten Flächen, das Produkt unbrauchbar machen, verschleiß- bzw. abriebfrei verarbeitet werden. Auch bei stark schleißenden Stoffen mit einer Mohs-Härte ab 4 ist ein verschleißfreier und damit wirtschaftlicher Betrieb des Windsichters möglich.A classifying wheel of the required type has become known, for example, from DE-C 35 08 889. An air classifier is described there, in the classifying wheel of which the blades, which are made entirely of a wear-resistant sintered material, are inserted into the recesses of a circular disk carrying the classifying wheel hub on the one hand and an annular cover plate on the other hand with axial play and are inserted into the recesses from a rubber-elastic, wear-resistant material mutual position are fixed and radially supported against circular disc or cover disc. With this air classifier, high-purity substances, in which even the slightest contamination, e.g. due to abrasion on well-touched surfaces, which make the product unusable, can be processed without wear or abrasion. Even with heavily abrasive fabrics with a Mohs hardness of 4 or more, wear-free and therefore economical operation of the air classifier is possible.

Nachteilig ist dabei aber der bei dem aus mehreren Teilen zusammengesetzten Sichtrad erforderliche Aufwand für das dynamische Auswuchten, da die Sichträder mit maximalen Umfangsgeschwindigkeiten über 50 m/s betrieben werden. Außerdem sind Sichträder mit Schaufeln aus Sinterwerkstoff von der Konstruktion her nicht ganz so steif wie solche ganz aus Stahl, so daß sie ohne Änderung der Konstruktion der Abdichtung zwischen Sichtrad und Absaugrohr für das Feingut nur mit etwa 80 % der maximalen Umfangsgeschwindigkeit der Sichträder aus Stahl betrieben werden können.However, the disadvantage of this is the effort required for dynamic balancing when the classifying wheel is composed of several parts, since the classifying wheels are operated at maximum circumferential speeds of over 50 m / s. In addition, classifying wheels with blades made of sintered material are not quite as stiff in design as those made entirely of steel, so that they operate without changing the design of the seal between classifying wheel and suction pipe for the fine material at only about 80% of the maximum circumferential speed of the classifying wheels made of steel can be.

Diese Nachteile zu vermeiden ist die Aufgabe der Erfindung.The object of the invention is to avoid these disadvantages.

Gelöst wird diese Aufgabe mit einem Sichtrad mit den Merkmalen gemäß dem Anspruch 1, wonach die die Sichtradnabe tragende Kreisscheibe, die ringförmige Deckscheibe und die dazwischen angeordneten, parallel zur Drehachse verlaufenden Sichtradschaufeln vollständig und in einem Stück aus einem verschleißfesten Sinterwerkstoff hergestellt sind.This object is achieved with a classifying wheel with the features according to claim 1, according to which the classifying wheel bearing the classifying wheel hub, the annular cover plate and the classifying wheel blades arranged therebetween and running parallel to the axis of rotation are produced completely and in one piece from a wear-resistant sintered material.

Für die Herstellung des Sichtradkörpers finden dabei die Verfahrensmaßnahmen und Vorrichtungen der Sintertechnik bzw. Pulvermetallurgie Anwendung. Wie beispielsweise in der DE-C 555 228 beschrieben, wird das pulverförmige Ausgangsmaterial - keramische oder metallische Sinterwerkstoffe - zusammen mit einem Bindemittel zu einem Preßkörper geformt, dieser wird durch mechanische Bearbeitung in die gewünschte Endgestalt übergeführt und dann gesintert. Anschließend ist nur noch ein Feinbearbeiten der Nabenbohrung des Sichtrades auf ein Fertigmaß für einen unmittelbaren Sitz auf der Antriebswelle, sowie der äußeren Stirnflächen von Kreisscheibe und Deckscheibe des Sichtrades auf exakt senkrechten Verlauf zu seiner Drehachse erforderlich. Beim Formen des Preßkörpers kann beispielsweise nach der DE-C 469 805 vorgegangen werden, die Verfahren und Preßvorrichtungen beschreibt, mit denen ein so kompliziert geformter Preßkörper wie der Sichtradkörper mit gleichmäßiger Dichte hergestellt werden kann.The process measures and devices of sintering technology or powder metallurgy are used for the production of the classifying wheel body. As described, for example, in DE-C 555 228, the powdered starting material - ceramic or metallic sintered materials - is shaped together with a binder to form a pressed body, which is converted into the desired final shape by mechanical processing and then sintered. Subsequently, all that is required is a fine machining of the hub bore of the classifying wheel to a finished dimension for a direct seat on the drive shaft, as well as the outer end faces of the circular disk and cover plate of the classifying wheel so that they run exactly perpendicular to its axis of rotation. The molding can be shaped, for example, according to DE-C 469 805, which describes methods and pressing devices by means of which a compact body as complex as the classifying wheel body can be produced with a uniform density.

Aus der GB-A 20 61 399 ist es zwar bekannt, für ein Pumpenlaufrad die einzelnen Laufradschaufeln zusammen mit Teilen der die Strömungskanäle axial begrenzenden Deckscheiben als ein zusammenhängendes Schaufelelement aus einem feuerfesten und verschleißfesten Werkstoff (als Beispiele werden dort Wolframkarbid oder Aluminiumoxyd genannt) durch spanabhebende Bearbeitung vor dem Sintern zu formen. Die einzelnen Schaufelelemente werden nach dem Sintern zum Laufrad zusammengesetzt und dieses zwischen zwei formangepaßte Metallscheiben gespannt, so daß ein sandwichartiger Aufbau mit der nötigen Festigkeit entsteht. Die Teile aus Sinterwerkstoff dienen hier ausschließlich als Schutz gegen Verschleiß durch das geförderte, einen Feststoff enthaltende Fluid. Es tritt dabei reine Gleitreibung auf, da die Geometrie der Schaufelkanäle wie bei jeder Strömungsmaschine auf möglichst wandparallele Strömung ausgelegt ist.From GB-A 20 61 399 it is known for a pump impeller to cut the individual impeller blades together with parts of the cover disks axially delimiting the flow channels as a coherent blade element made of a refractory and wear-resistant material (examples of which are tungsten carbide or aluminum oxide) Shaping machining before sintering. After sintering, the individual blade elements are assembled to form the impeller and this is stretched between two shape-matched metal disks, so that a sandwich-like structure with the necessary strength is produced. The parts made of sintered material are used here only as protection against wear due to the pumped fluid containing a solid. Pure sliding friction occurs here, since the geometry of the blade channels, as with any turbomachine, is designed for flow that is as parallel as possible to the wall.

Bei Schaufelrad-Windsichtern der hier betrachteten Art sind dagegen völlig andere Strömungsverhältnisse in den Schaufelkanälen zu berücksichtigen. Als funktionswesentliches Bauteil ist hier zwar wie bei einer Pumpe oder einem Gebläse ein motorgetriebenes Schaufelrad vorhanden, jedoch wird durch ein außerhalb des Windsichters angeordnetes Gebläse in den Schaufelkanälen des Sichtrades eine Strömung erzeugt, die entgegengesetzt zu der Strömung verläuft, die bei einem Betrieb des Sichtrades als Gebläserad entstehen würde, d.h. die Strömung beim Sichtrad verläuft von dessen Außenumfang radial nach innen, also entgegen seiner Schleuderrichtung. Dabei entsteht an den Schaufelkanten am Radumfang eine sehr starke Strömungsumlenkung, durch die erst die in der Sichtluft mitgeführten Gutteilchen eine den Sichtvorgang mitbestimmende Zentrifugalbeschleunigung erhalten. Der Sichtvorgang resultiert dann aus dem Zusammenwirken der Teilchen-Fliehkraft und der Schleppkraft, die die Sichtluft auf die Teilchen ausübt. Bei kleinen Teilchen überwiegt die Schleppkraft, so daß sie von der Sichtluft mitgenommen und als Feingut ausgetragen werden. Bei großen Teilchen und Agglomeraten aus kleinen Teilchen überwiegt die Fliehkraft, so daß sie eine Bewegungskomponente quer zur Strömungsrichtung der Sichtluft erhalten, die sie nach außen ablenkt und gegen die Sichtradschaufeln prallen läßt. Kompakte Teilchen werden dadurch gänzlich nach außen geschleudert, so daß sie den Sichter schließlich als Grobgut verlassen. Agglomerate werden in die einzelnen Teilchen aufgelöst und diese erneut dem Sichtvorgang unterzogen. Anders als bei Strömungsmaschinen werden die Schaufeln des Sichtrades in erster Linie also durch Prallkräfte und den durch sie verursachten Verschleiß beansprucht.With paddlewheel air classifiers of the type considered here, however, completely different flow conditions in the blade channels have to be taken into account. As a functionally essential component there is a motor-driven paddle wheel like a pump or a blower, but a blower arranged outside the air classifier creates a flow in the bucket channels of the classifying wheel that is opposite to the flow that occurs when the classifying wheel is operated as Blower wheel would arise, ie the flow in the classifying wheel runs radially inward from its outer circumference, that is to say counter to its direction of rotation. This creates a very strong flow deflection at the blade edges on the wheel circumference, through which only the good particles carried in the classifying air receive a centrifugal acceleration that also determines the classifying process. The sighting process then results from the interaction of the particle centrifugal force and the drag force which the sighting air exerts on the particles. In the case of small particles, this predominates Towing force, so that they are carried away by the classifying air and discharged as fine material. In the case of large particles and agglomerates composed of small particles, the centrifugal force predominates, so that they receive a component of motion transversely to the direction of flow of the classifying air, which deflects them outwards and makes them collide with the classifying wheel blades. As a result, compact particles are thrown out completely, so that they finally leave the classifier as coarse material. Agglomerates are dissolved in the individual particles and subjected to the screening process again. In contrast to turbomachines, the blades of the classifying wheel are primarily stressed by impact forces and the wear they cause.

Mit dem beschriebenen Sichtrad nach DE-C 35 08 889 ist diese Beanspruchungsart voll beherrschbar, wenn man von den erwähnten Nachteilen absieht. Bei dem erfindungsgemäß ausgebildeten Sichtrad sind auch diese Nachteile beseitigt. Da es vollständig und in einem Stück aus einem einheitlichen Sinterwerkstoff gefertigt ist, so daß Schrauben, Kleben, Löten oder andere Verbindungsmittel entfallen, kann es mit so hoher Maßgenauigkeit hergestellt werden, daß auf ein dynamisches Auswuchten verzichtet werden kann. Auch wird eine hohe Formstabilität erreicht, die es erlaubt, daß die Abdichtung zwischen Feingut- und Grobgutraum des Sichters an der ringförmigen Deckscheibe des Sichtrades als einfacher Ringspalt ausgeführt werden kann. Die geringere Dichte des Werkstoffs gegenüber Stahl mit entsprechend geringeren Massenkräften sowie seine Festigkeit erlauben höhere Drehzahlen als bei einem entsprechenden Sichtrad aus Stahl. Dies bedeutet eine Erweiterung des Arbeitsbereichs eines Sichtrades zu feineren Trenngrenzen. Als weiterer Vorteil ergibt sich die Möglichkeit, ein heißes Gas zur Sichtung einzusetzen, wobei die Temperatur nach oben hin allerdings durch die Wärmebelastbarkeit der Sichtradlagerung begrenzt wird. Mit der Ausbildung der Strömungskanäle im Sichtrad mit parallel zueinander verlaufenden Wänden ergibt sich neben der einfachen Herstellbarkeit noch als unerwarteter und überraschender Vorteil, daß eine bessere Trennschärfe der Sichtung und ein günstigeres Verschleißverhalten im Vergleich zu allen bekannten Sichträdern erzielt wird.With the described sight wheel according to DE-C 35 08 889, this type of stress is fully manageable, apart from the disadvantages mentioned. These disadvantages are also eliminated in the classifying wheel designed according to the invention. Since it is made completely and in one piece from a uniform sintered material, so that screws, gluing, soldering or other connecting means are not required, it can be manufactured with such high dimensional accuracy that dynamic balancing can be dispensed with. A high degree of dimensional stability is also achieved, which allows the seal between the fine and coarse material space of the classifier on the annular cover plate of the classifying wheel to be designed as a simple annular gap. The lower density of the material compared to steel with correspondingly lower mass forces and its strength allow higher speeds than with a corresponding classifying wheel made of steel. This means an extension of the working area of a classifying wheel to finer separation limits. A further advantage is the possibility of using a hot gas for the sifting, the upper limit of the temperature, however, being the heat load capacity of the sight wheel bearing. With the formation of the flow channels in the classifying wheel with walls running parallel to one another, in addition to the simple manufacture, there is also an unexpected and surprising advantage that a better selectivity of the classifying and a more favorable wear behavior is achieved in comparison to all known classifying wheels.

In der Zeichnung ist ein erfindungsgemäß ausgebildetes Sichtrad in zwei Ansichten und teilweise im Schnitt dargestellt. Das Sichtrad 1, das aus der Kreisscheibe 2 mit Nabe 3, der Deckscheibe 4 und den die Strömungskanäle 6 bildenden Schaufeln 5 besteht, ist vollständig und in einem Stück aus einem Sinterwerkstoff hergestellt. Die Bohrung in der Nabe 3 weist ein Fertigmaß auf, das es erlaubt, das Sichtrad 1 unmittelbar auf die (nicht dargestellte) Antriebswelle aufzuziehen. Zur Drehmomentübertragung dient eine entsprechend geformte Paßfeder, die in die im Querschnitt halbkreisförmig ausgebildete Nut 7 in der Nabe 3 eingreift. Die radial gerichteten Strömungskanäle 6 werden durch parallel zueinander und in Richtung der Drehachse 8 verlaufende Flächen der Schaufeln 5 gebildet, die im Übergangsbereich zur Kreisscheibe 2 bzw. Deckscheibe 4 durch eine Bogenfläche miteinander verbunden sind. Die Form der Strömungskanäle 6 kann am einfachsten mit Hilfe eines zylindrischen Fingerfräsers erhalten werden. Die vergrößert gezeichneten Details A und B zeigen die abgeschrägten Kanten der Schaufeln 5 am Außenumfang des Sichtrades 1.In the drawing, an inventive sight wheel is shown in two views and partially in section. The classifying wheel 1, which consists of the circular disk 2 with the hub 3, the cover disk 4 and the blades 5 forming the flow channels 6, is made completely and in one piece from a sintered material. The bore in the hub 3 has a finished size, which allows the sight wheel 1 to be mounted directly onto the drive shaft (not shown). A correspondingly shaped feather key is used for torque transmission, which engages in the groove 7 in the hub 3, which is semicircular in cross section. The radially directed flow channels 6 are formed by surfaces of the blades 5 which run parallel to one another and in the direction of the axis of rotation 8 and which are connected to one another in the transition region to the circular disc 2 or cover disc 4 by an arc surface. The shape of the flow channels 6 can be most easily obtained with the aid of a cylindrical end mill. The enlarged details A and B show the chamfered edges of the blades 5 on the outer circumference of the classifying wheel 1.

Claims (5)

1. Sichtrad aus einem Sinterwerkstoff für einen Windsichter mit von der Sichtluft entgegen seiner Schleuderrichtung von außen nach innen durchströmten, kranzförmig angeordneten und parallel zur Drehachse verlaufenden Schaufeln zwischen einer die Sichtradnabe tragenden Kreisscheibe und einer ringförmigen Deckscheibe mit folgenden Merkmalen: - Das aus Kreisscheibe (2) mit Nabe (3), Deckscheibe (4) und zwischen diesen angeordneten, parallel zur Drehachse (8) verlaufenden Schaufeln (5) bestehende Sichtrad (1) ist vollständig und in einem Stück aus einem Sinterwerkstoff hergestellt, - die Bohrung in der Nabe (3) ist auf ein Fertigmaß für das unmittelbare Aufziehen des Sichtrades auf seine Antriebswelle bearbeitet, - die in die Nabe (3) eingearbeitete Nut (7) zur Aufnahme einer entsprechend geformten Paßfeder für die Drehmomentübertragung ist im Querschnitt halbkreisförmig ausgebildet, - die Strömungskanäle (6) werden durch parallel zueinander und in Richtung der Drehachse (8) verlaufende Flächen der Schaufeln (5) gebildet, die im Übergangsbereich zu Kreisscheibe (2) bzw. Deckscheibe (3) durch eine Bogenfläche miteinander verbunden sind, - die Kanten der Schaufeln (5) am Außenumfang des Sichtrades sind leicht abgeschrägt. 1. Sight wheel made of a sintered material for a wind sifter with blades arranged in a ring shape and running parallel to the axis of rotation between the circular air bearing the sight wheel hub and an annular cover disk with the following features: - The classifying wheel (1) consisting of circular disc (2) with hub (3), cover disc (4) and blades (5) arranged between them and running parallel to the axis of rotation (8) is made completely and in one piece from a sintered material, - The bore in the hub (3) is machined to a finished size for the immediate mounting of the classifying wheel on its drive shaft, - The groove (7) worked into the hub (3) for receiving a correspondingly shaped feather key for torque transmission is semicircular in cross section, the flow channels (6) are formed by surfaces of the blades (5) which run parallel to one another and in the direction of the axis of rotation (8) and which are connected to one another in the transition region to the circular disc (2) or cover disc (3) by an arc surface, - The edges of the blades (5) on the outer circumference of the classifying wheel are slightly chamfered. 2. Sichtrad nach Anspruch 1, dadurch gekennzeichnet, daß die Strömungskanäle (6) radial gerichtet sind.2. classifying wheel according to claim 1, characterized in that the flow channels (6) are directed radially. 3. Sichtrad nach Anspruch 2, dadurch gekennzeichnet, daß die Abmessung eines Strömungskanals (6) in radialer Richtung 1/10 bis 1/7 des Sichtrad-Außendurchmessers beträgt.3. classifier wheel according to claim 2, characterized in that the dimension of a flow channel (6) in the radial direction is 1/10 to 1/7 of the classifier wheel outer diameter. 4. Sichtrad nach Anspruch 2, dadurch gekennzeichnet, daß in Umfangsrichtung die Breite eines Strömungskanals (6) 4 bis 6 mm beträgt.4. classifying wheel according to claim 2, characterized in that in the circumferential direction the width of a flow channel (6) is 4 to 6 mm. 5. Sichtrad nach Anspruch 4, dadurch gekennzeichnet, daß sich am Außenumfang des Sichtrades (1) in Umfangsrichtung die Breite einer Schaufel (5) zur Breite eines Strömungskanals (6) wie 1,60 bis 1,65 zu 1 verhält.5. classifying wheel according to claim 4, characterized in that on the outer circumference of the classifying wheel (1) in the circumferential direction the width of a blade (5) relates to the width of a flow channel (6) such as 1.60 to 1.65 to 1.
EP92120687A 1991-12-10 1992-12-04 Classifying rotor for a centrifugal pneumatic separator Withdrawn EP0546458A1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994012290A1 (en) * 1992-12-01 1994-06-09 Sinvent A/S Rotor for mechanical air classifiers
EP0736337A1 (en) * 1995-04-07 1996-10-09 HOSOKAWA ALPINE Aktiengesellschaft Classifying rotor for a centrifugal pneumatic separator

Families Citing this family (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4311242C2 (en) * 1993-04-06 1995-08-31 Daimler Benz Ag Rotor for an electrical machine
DE4419522B4 (en) * 1994-06-03 2006-06-29 Hosokawa Alpine Ag Classifying wheel for blower air classifier
ID17196A (en) 1996-03-14 1997-12-11 Dow Chemical Co ADHESIVE INGREDIENTS THAT CONTAIN OLEFIN POLYMER
US6107430A (en) * 1996-03-14 2000-08-22 The Dow Chemical Company Low application temperature hot melt adhesive comprising ethylene α-olefin
DE19613902C2 (en) * 1996-04-06 1998-08-06 Hosokawa Alpine Ag Air classifier with rigid classifier body
RU2094135C1 (en) * 1996-08-08 1997-10-27 Йелстаун Корпорейшн Н.В. Classifier
DE19743491C2 (en) * 1996-10-04 2003-03-20 Schmidt & Co Gmbh & Co Kg Air classifier with classifying rotor and method for separating grain classes
DE19643043C2 (en) * 1996-10-18 1998-11-05 Hosokawa Alpine Ag Centrifugal air classifier with radial fine material discharge
ES2190796T3 (en) * 1996-10-18 2003-08-16 Hosokawa Alpine Ag & Co VERTICAL AXLE PNEUMATIC SEPARATOR.
US5927510A (en) * 1997-02-19 1999-07-27 Xerox Corporation Particle classification apparatus and processes thereof
AU757501B2 (en) 1998-06-30 2003-02-20 Dow Chemical Company, The Hot melt adhesive composition comprising homogeneous ethylene interpolymer and block copolymer
DE19840344C2 (en) * 1998-09-04 2002-04-04 Hosokawa Alpine Ag & Co Classifying wheel for a centrifugal air classifier
US6038987A (en) * 1999-01-11 2000-03-21 Pittsburgh Mineral And Environmental Technology, Inc. Method and apparatus for reducing the carbon content of combustion ash and related products
DE19903948C2 (en) * 1999-02-02 2002-07-18 Hosokawa Alpine Ag & Co Centrifugal classifier
US6776291B1 (en) 2000-09-27 2004-08-17 Xerox Corporation Article and apparatus for particulate size separation
DE602004010412T2 (en) * 2003-08-19 2008-10-16 Dow Global Technologies, Inc., Midland MIXING POLYMERISATES AS MELTING ADHESIVE AND METHOD FOR THE PRODUCTION THEREOF
JP2006061902A (en) * 2004-07-28 2006-03-09 Ricoh Co Ltd Pulverizing apparatus and method for pulverizing
DE102004053530B4 (en) * 2004-11-05 2008-04-30 Aufbereitungstechnologie Noll Gmbh Classifying wheel for a device for separating dusty, fibrous or granular goods
AU2013364469B2 (en) 2012-12-19 2017-09-21 Delaval Holding Ab A milk conduit, a milk conduit device, a milk-receiving member and a milking member
DE102016015051B4 (en) 2016-12-16 2019-01-31 Hosokawa Alpine Aktiengesellschaft Classifying wheel for a centrifugal air classifier
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2061399A (en) * 1979-10-29 1981-05-13 Rockwell International Corp A composite pump impeller
DE3131442A1 (en) * 1981-08-07 1983-02-24 Mitsubishi Electric Corp Pump
WO1990006827A1 (en) * 1988-12-21 1990-06-28 Abb Stal Ab Method for manufacturing rings or discs having a blade or vane rim
DE3508889C1 (en) * 1985-03-13 1992-02-20 Alpine Ag, 8900 Augsburg Air classifier with wear-free classifying wheel

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE469805C (en) * 1926-09-09 1928-12-27 Bound Brook Oil Less Bearing C Manufacture of objects from powdery or plastic materials by pressing them together
DE555228C (en) * 1928-06-16 1932-07-19 Patra Patent Treuhand Process for the production of molded bodies for tools from difficult-to-machine compounds of difficult-to-melt metals or mixtures of such compounds with easily-meltable metals
US2269412A (en) * 1940-07-18 1942-01-06 Sturtevant Mill Co Air separator
BE482847A (en) * 1947-06-26
US2953307A (en) * 1956-10-15 1960-09-20 Microcylclomat Co Synergistic fluid energy reducing and classifying unit
DE1167634B (en) * 1961-07-12 1964-04-09 Alpine Ag Maschinenfabrik Und Classifier with classifier wheel
US3384238A (en) * 1966-02-17 1968-05-21 Air Sifters Inc Classifying system
US3498453A (en) * 1967-10-10 1970-03-03 Alpine Ag Fluid flow classifier
US4409097A (en) * 1981-10-16 1983-10-11 Omya Gmbh Improved pivotable centrifugal classifier and method of classifying
DE3303078C1 (en) * 1983-01-29 1984-05-30 Alpine Ag, 8900 Augsburg Air classifier for the fine area
JPH01297182A (en) * 1988-05-25 1989-11-30 Kurimoto Ltd Air-flow type centrifugal classifier
DE3912076A1 (en) * 1989-04-13 1990-10-25 Happle Gmbh & Co Maschf Centrifugal separator
JPH0344825A (en) * 1989-07-12 1991-02-26 Hitachi Ltd Optical information reproducing device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2061399A (en) * 1979-10-29 1981-05-13 Rockwell International Corp A composite pump impeller
DE3131442A1 (en) * 1981-08-07 1983-02-24 Mitsubishi Electric Corp Pump
DE3508889C1 (en) * 1985-03-13 1992-02-20 Alpine Ag, 8900 Augsburg Air classifier with wear-free classifying wheel
WO1990006827A1 (en) * 1988-12-21 1990-06-28 Abb Stal Ab Method for manufacturing rings or discs having a blade or vane rim

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 14, no. 80 (C-689)(4023) 15. Februar 1990 & JP-A-01 297 182 ( KURIMOTO LTD. ) 30. November 1989 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994012290A1 (en) * 1992-12-01 1994-06-09 Sinvent A/S Rotor for mechanical air classifiers
US5593043A (en) * 1992-12-01 1997-01-14 Sinvent A/S Rotor for mechanical air classifiers
AU677371B2 (en) * 1992-12-01 1997-04-24 Sinvent As Rotor for mechanical air classifiers
EP0736337A1 (en) * 1995-04-07 1996-10-09 HOSOKAWA ALPINE Aktiengesellschaft Classifying rotor for a centrifugal pneumatic separator
CN1054552C (en) * 1995-04-07 2000-07-19 霍索卡瓦阿尔彼股份公司及两合公司 Grading wheel for centrifugal wheel air classifier

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US5377843A (en) 1995-01-03
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