EP4059624A1 - Device and method for separating dusty materials - Google Patents
Device and method for separating dusty materials Download PDFInfo
- Publication number
- EP4059624A1 EP4059624A1 EP22000047.5A EP22000047A EP4059624A1 EP 4059624 A1 EP4059624 A1 EP 4059624A1 EP 22000047 A EP22000047 A EP 22000047A EP 4059624 A1 EP4059624 A1 EP 4059624A1
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- Prior art keywords
- wheel
- classifying
- classifying wheel
- internals
- flow
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- 239000000463 material Substances 0.000 title claims description 13
- 238000000034 method Methods 0.000 title claims description 6
- 239000012530 fluid Substances 0.000 claims abstract description 21
- 238000009434 installation Methods 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 abstract description 6
- 238000005119 centrifugation Methods 0.000 abstract 1
- 239000002245 particle Substances 0.000 description 6
- 238000000926 separation method Methods 0.000 description 3
- 230000002411 adverse Effects 0.000 description 1
- 239000013590 bulk material Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B7/00—Selective separation of solid materials carried by, or dispersed in, gas currents
- B07B7/08—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force
- B07B7/083—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force generated by rotating vanes, discs, drums, or brushes
Definitions
- the invention relates to a classifying wheel for a centrifugal air classifier according to the preamble of claim 1 and a method for separating classified material dispersed in a classifying fluid into a fine and a coarse fraction according to the preamble of claim 10.
- Air classifiers are used to separate a material dispersed in a fluid into a fine and a coarse fraction.
- the separating effect of a classifying wheel is based on the fact that the drag force of the fluid and the centrifugal force in the flow channels between the classifying wheel blades of a classifying wheel, the so-called deflector wheel, act in opposite directions on the individual particles of the solid.
- the drag force predominates, so that they are carried along by the fluid and discharged as fines.
- the centrifugal force predominates, so that they are thrown out of the deflector wheel against the fluid flow.
- the particle size for which centrifugal force and drag force are in equilibrium i.e. which is equally likely to end up in the fine or coarse material, is referred to as the cut-off size or cut-off point.
- Centrifugal air classifiers with a deflector wheel are one of the preferred classifiers for producing very fine classifying materials with relatively little energy consumption. For a clear separation of the sifted material into fine material and coarse material, it is necessary for the fluid to flow through all flow channels of the deflector wheel with the same mean radial velocity.
- DE 198 40 344 A2 discloses providing internals in the radially outer region of the classifier wheel channels in order to prevent unwanted and uncontrolled formation of vortices in the flow channels between the classifier wheel blades.
- the internals in the radially outer area of the classifier wheel channels are intended to create a controlled formation of vortices to generate a classifying zone in the outer area between the classifier wheel blades.
- This sucking out of the fines from inside the classifying wheel results in unstable flow conditions during classifying, which prevent higher fineness from being achieved.
- this outflow occurs during the sifting and takes place at least in a flow channel between two sifting wheel blades.
- the object of the invention is therefore to provide a classifying wheel and a classifying method which prevents unstable flow conditions due to the formation of vortices in the flow channels of classifying wheels.
- the classifying wheel according to the invention for a centrifugal force wind classifier is rotationally driven in this and is flowed through from the outside to the inside against its centrifugal direction. It has classifying wheel vanes arranged in a ring between two retaining disks. The classifier wheel vanes and the retaining disks delimit the flow channels. Built-in components influencing the course of flow are arranged in these flow channels.
- the classifying wheel according to the invention In its flow channels, which are delimited by the classifying wheel blades, the classifying wheel according to the invention also has internals near the outlet side of the flow channels, i.e. towards the axis of rotation of the classifying wheel. These internals mean that the individual flow channels are flowed through with the same or at least a similar quantity of fluid.
- baffles are located within the inner two-thirds (2/3) of the classifier wheel radius in the flow channels.
- the built-in components are preferably located on a common radial circular path, which is approximately in an area that lies within the inner two-thirds of the classifier wheel radius.
- the flow breakers in the radially inner area of the classifier wheel blades are internals whose cross sections preferably have a polygonal (e.g. square, rectangular, quadrangular, triangular) or round shape or a combination thereof and preferably extend axially over the entire axial height of the classifier wheel blades or the flow channels .
- a polygonal e.g. square, rectangular, quadrangular, triangular
- round shape a combination thereof
- any other cross-sectional shape can also be used.
- these internals do not extend over the entire axial height of the classifier wheel blades. In a further embodiment, the internals are not on a common circular path around the axis of rotation of the classifier wheel.
- the radial distance between these built-in components and the axis of the classifying wheel is not constant along the height of the axis of the classifying wheel.
- the internals are designed in such a way that they continuously narrow the flow channel from a radially further outward position to a radially further inward position. This is intended to mean that the narrowing occurs without one or more angular gradations.
- These internals can be located either on both sides of the classifier wheel blades or only on the front or rear side of the classifier wheel blades, viewed in the direction of rotation of the classifier wheel.
- a preferred variant of the internals terminates on the inside of the classifying wheel blades approximately flush or flush with the latter.
- the size and shape of the internals can vary depending on the application. A combination of two or more differently shaped internals is also possible.
- the classifier wheel blades and the internals can be made from one part or from several parts.
- the classifying wheel in the flow channels also has built-in components within the radially outer third, based on the classifying wheel radius.
- both the radially outer sifting vortex can be advantageously influenced for fine sifting and the flow in the flow channels can be stabilized. So both vortices are bounded on both sides by internals.
- the internals are designed as metal sheets with bores or openings and protrude over the entire height and width of the flow channels. They are arranged in the flow channels.
- the contours of the metal sheets preferably follow the circular path around the axis of rotation of the classifying wheel on which they are arranged.
- the sheets have a constant distance to the classifying wheel axis. The distance is less than two thirds of the radius of the separator wheel. This type of internals also limits the vortex inwards.
- the retaining disks, between which the classifying wheel blades are arranged, can be designed as hub disks or cover disks.
- the cover disk is provided with a fines outlet. It is preferably designed in the form of a ring.
- the classifying wheel according to the invention can be designed either as a single-flow or as a double-flow.
- a double-flow classifying wheel can be composed of two single-flow classifying wheels.
- the classifying wheels are assembled on their cover disks so that they have a common axis of rotation.
- the double-flow sifter wheel now has two hub disks and is mounted on both sides in the housing of the centrifugal air sifter.
- the two hub disks have openings that represent the outlets for the fines.
- the cover disks in the middle of the classifying wheel are omitted, so that it has a continuous interior area.
- the internals a in the radially outermost area of the classifier wheel blades result in the momentum of the inflowing fluid being converted more efficiently into an increase in velocity in the classifying vortex than in the case of the patent specification EP 0 983 802 A2 revealed sight wheel.
- the variants which have discontinuous profiles of the specially shaped classifying wheel blades due to kinks and edges, are not as efficient as variants with continuous contours due to losses in momentum exchange. Since the variants with kinked ends of the separator vane do not convert the momentum of the inflowing fluid as efficiently, the speed increases are lower there in comparison to continuous contours.
- the flow in the classifying wheel could be stabilized and the fineness range of classifiers could be improved towards smaller finenesses by means of a classifying wheel with the installations according to the invention in the flow channels towards the outlet side.
- the figure 1 shows a classifying wheel (10) for a centrifugal air classifier. It comprises a hub disc (2) carrying the classifying wheel hub (1) and an annular cover disc (4).
- the classifying wheel blades (3) arranged in a ring are arranged between these discs. They are distributed evenly over the circumference of the classifying wheel (10).
- the classifying wheel vanes (3) are aligned essentially radially and delimit the flow channels.
- the classifying wheel (10) is flowed through from the outside inward by the particle-laden classifying fluid, for example classifying air.
- the classifying wheel (10) according to the invention has flow channels which have internals (5) in the outer third, based on the classifying wheel radius, and in addition to these internals, further internals (7) in the inner two thirds of the flow channels, based on the classifying wheel radius. These narrow the flow channel (6) on the outlet side and thereby stabilize the flow in the separator wheel (10).
- Sections of cross-sections of classifier wheels (10) are shown which, in addition to the known external internals (5) in the outer area of the flow channels (6), also have internals (7) in the inner two-thirds of the flow channels (6), based on the classifier wheel radius .
- the classifying wheel blades (3) do not run exactly in the radial direction in the radially outer third, the classifying wheel radius, but are arranged inclined at an angle to the radial direction counter to the direction of rotation. In the inner two-thirds they are aligned radially.
- the inner vortex is bounded on both sides by the internals (5, 7). There is no longer any outflow of the fluid with particles from the middle of the classifying wheel to the outside into the classifying space around the classifying wheel, as a result of which the flow through the classifying wheel is stabilized.
- the course of the undisturbed flow of fines from the outside inwards is indicated by the thick arrow in the figures 2 and 3 shown.
- the built-in components (7) are preferably located on a common radial circular path, which is in an area that lies within the inner two-thirds of the classifying wheel radius.
- the internals (7) are rectangular. They are fitted inside the flow channels (6) on the two classifying wheel vanes (3) delimiting the channel.
- FIG 3 shows a further embodiment of the internals (7). They are designed in such a way that they continuously narrow the flow channel (6) from a radially outer position to a radially inner position. This is intended to mean that the narrowing occurs without one or more angular gradations.
- These internals (7) are only on one side of the flow channel (6). The internals (7) are almost flush with the classifier wheel blades (3) on the inside. You can also finish flush.
- the inner installations (7) are designed in such a way that the installations (7) together with the separator wheel blades (3) converge radially inwards in a point, this prevents material deposits on the inner separator wheel blade edges.
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- Combined Means For Separation Of Solids (AREA)
- Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
Abstract
Bei einem Sichtrad für einen Zentrifugalkraft-Windsichter, welches von einem Sichtfluid entgegen seiner Schleuderrichtung von außen nach innen durchströmt wird und welches kranzförmig angeordnete Sichtradschaufeln aufweist, die zwischen Haltescheiben angeordnet sind, und Strömungskanäle zwischen den Sichtradschaufeln bilden, wobei in den Strömungskanälen den Strömungsverlauf beeinflussende Einbauten angeordnet sind, sollen instabile Strömungszustände aufgrund von Wirbelbildung in den Strömungskanälen verhindert werden. Dies wird dadurch erreicht, dass die Strömungskanäle auslassseitig in Richtung der Sichtraddrehachse Einbauten aufweisen. In a classifying wheel for a centrifugal force air classifier, through which a classifying fluid flows from outside to inside against the direction of its centrifugation and which has classifying wheel blades arranged in a ring shape, which are arranged between retaining disks, and form flow channels between the classifying wheel blades, with internals in the flow channels influencing the course of the flow are arranged, unstable flow conditions are to be prevented due to the formation of vortices in the flow channels. This is achieved in that the flow channels have internals on the outlet side in the direction of the axis of rotation of the classifying wheel.
Description
Die Erfindung richtet sich auf ein Sichtrad für einen Zentrifugalkraft-Windsichter nach dem Oberbegriff des Anspruchs 1 und ein Verfahren zur Trennung von in einem Sichtfluid dispergierten Sichtgut in eine Fein- und eine Grobfraktion nach dem Oberbegriff des Anspruchs 10.The invention relates to a classifying wheel for a centrifugal air classifier according to the preamble of
Windsichter dienen dazu ein in einem Fluid dispergiertes Sichtgut in eine Fein- und eine Grobfraktion zu trennen. Die Trennwirkung eines Sichtrades beruht darauf, dass die Schleppkraft des Fluids und die Fliehkraft in den Strömungskanälen zwischen den Sichtradschaufeln eines Sichtrades, des sogenannten Abweiserades in einander entgegengesetzten Richtungen auf die einzelnen Partikel des Feststoffes einwirken. Bei kleinen Partikeln überwiegt die Schleppkraft, so dass sie vom Fluid mitgenommen und als Feingut ausgetragen werden. Bei großen Partikeln überwiegt die Fliehkraft, so dass sie entgegen der Fluidströmung aus dem Abweiserad geschleudert werden. Die Partikelgröße, für die Fliehkraft und Schleppkraft im Gleichgewicht sind, die also mit gleicher Wahrscheinlichkeit in das Feingut oder das Grobgut gelangt, wird als Trennkorngröße oder Trenngrenze bezeichnet.Air classifiers are used to separate a material dispersed in a fluid into a fine and a coarse fraction. The separating effect of a classifying wheel is based on the fact that the drag force of the fluid and the centrifugal force in the flow channels between the classifying wheel blades of a classifying wheel, the so-called deflector wheel, act in opposite directions on the individual particles of the solid. In the case of small particles, the drag force predominates, so that they are carried along by the fluid and discharged as fines. In the case of large particles, the centrifugal force predominates, so that they are thrown out of the deflector wheel against the fluid flow. The particle size for which centrifugal force and drag force are in equilibrium, i.e. which is equally likely to end up in the fine or coarse material, is referred to as the cut-off size or cut-off point.
Die Anforderungen an die Sichtung von Schüttgütern werden immer höher. Es werden immer größere Mengen an Schüttgut gesichtet. Auch an das Ergebnis der Sichtung werden immer höhere Anforderungen gestellt. Die Sichtung soll nicht nur wirtschaftlich sein, auch die Trennschärfe und das Ausbringen sollen hoch sein. Zudem werden die Anforderungen an die Sichter hinsichtlich der erreichbaren Feinheiten immer höher.The requirements for sifting bulk materials are increasing all the time. Larger and larger amounts of bulk material are being sighted. Increasingly high demands are also placed on the result of the screening. The sifting should not only be economical, the selectivity and the output should also be high. In addition, the demands on the sifter in terms of the achievable subtleties are increasing.
Zentrifugalkraft-Windsichter mit Abweiserad sind eine der bevorzugten Sichter zur Erzeugung von sehr feinen Sichtgütern unter verhältnismäßig geringem Energieaufwand. Für eine scharfe Trennung des Sichtgutes in Feingut und Grobgut ist es erforderlich, dass in allen Strömungskanälen des Abweiserades eine gleichmäßige Durchströmung mit gleicher mittlerer Radialgeschwindigkeit des Fluids erfolgt.Centrifugal air classifiers with a deflector wheel are one of the preferred classifiers for producing very fine classifying materials with relatively little energy consumption. For a clear separation of the sifted material into fine material and coarse material, it is necessary for the fluid to flow through all flow channels of the deflector wheel with the same mean radial velocity.
Selbst bei optimaler Ausbildung des Fluidzulaufes ist es jedoch nicht zu vermeiden, dass sich wegen turbulenter Strömungsverhältnisse und vor allem bei einem Abweiserad mit relativ großer axialer Erstreckung nur eine ungleichmäßige Durchströmung der Kanäle zwischen den Schaufeln einstellt. Die Folge ist eine unscharfe Trennung und ein geringerer Durchsatz gegenüber dem bei gleichmäßiger Durchströmung möglichen Wert.However, even with an optimal design of the fluid inlet, it cannot be avoided that only an uneven flow through the channels between the blades occurs due to turbulent flow conditions and above all in the case of a deflector wheel with a relatively large axial extension. The result is a blurred separation and a lower throughput compared to the value that is possible with a uniform flow.
Es ist bekannt, wie in
Es hat sich jedoch gezeigt, dass die im Patent
Der Erfindung liegt daher die Aufgabe zugrunde ein Sichtrad und ein Sichtverfahren zur Verfügung zu stellen, welches instabile Strömungszustände aufgrund der Wirbelbildung in Strömungskanälen von Sichträdern verhindert.The object of the invention is therefore to provide a classifying wheel and a classifying method which prevents unstable flow conditions due to the formation of vortices in the flow channels of classifying wheels.
Bei einem Sichtrad für einen Zentrifugalkraft-Windsichter und einem Verfahren zur Trennung von in einem Sichtfluid dispergiertem Sichtgut in eine Fein- und eine Grobfraktion der eingangs beschriebenen Art wird die Aufgabe erfindungsgemäß durch das Kennzeichen des Anspruchs 1 und des Anspruchs 10 gelöst.With a classifying wheel for a centrifugal air classifier and a method for separating classified material dispersed in a classifying fluid into a fine and a coarse fraction of the type described above, the object is achieved according to the invention by the characterizing part of
Das erfindungsgemäße Sichtrad für einen Zentrifugalkraft-Windsichter ist drehangetrieben in diesem angeordnet und wird entgegen seiner Schleuderrichtung von außen nach innen durchströmt. Es weist zwischen zwei Haltescheiben kranzförmig angeordnete Sichtradschaufeln auf. Die Sichtradschaufeln und die Haltescheiben begrenzen die Strömungskanäle. In diesen Strömungskanälen sind den Strömungsverlauf beeinflussende Einbauten angeordnet.The classifying wheel according to the invention for a centrifugal force wind classifier is rotationally driven in this and is flowed through from the outside to the inside against its centrifugal direction. It has classifying wheel vanes arranged in a ring between two retaining disks. The classifier wheel vanes and the retaining disks delimit the flow channels. Built-in components influencing the course of flow are arranged in these flow channels.
Das erfindungsgemäße Sichtrad weist in seinen Strömungskanälen, die durch die Sichtradschaufeln begrenzt sind, zusätzlich Einbauten in der Nähe der Auslassseite der Strömungskanäle auf, d.h. zur Drehachse des Sichtrades hin. Diese Einbauten führen dazu, dass die einzelnen Strömungskanäle mit gleicher bzw. zumindest ähnlicher Fluidmenge durchströmt werden.In its flow channels, which are delimited by the classifying wheel blades, the classifying wheel according to the invention also has internals near the outlet side of the flow channels, i.e. towards the axis of rotation of the classifying wheel. These internals mean that the individual flow channels are flowed through with the same or at least a similar quantity of fluid.
Diese Einbauten verhindern, dass Feingut aus der Sichtradmitte zurück in den Sichtraum außerhalb des Sichtrades fließt, wodurch eine Stabilisierung der Sichtraddurchströmung erreicht wird. Die Einbauten sind innerhalb der inneren zwei Drittel (2/3) des Sichtradradius in den Strömungskanälen angeordnet.These internals prevent fines from flowing back from the center of the classifying wheel into the classifying space outside of the classifying wheel, which stabilizes the flow through the classifying wheel. The baffles are located within the inner two-thirds (2/3) of the classifier wheel radius in the flow channels.
Strömungssimulationen von Abweiserädern mit Einbauten im äußeren Drittel der Strömungskanäle zeigen, dass sich in den Strömungskanälen des Sichtrads zusätzlich zu dem Sichtwirbel innerhalb des radial äußeren Drittels des Sichtradradius ein zweiter Wirbel ausbildet. Dieser zweite Wirbel saugt Material - Feingut - aus der Sichtradmitte heraus. Im Zusammenwirken mit dem Sichtwirbel kann so Feingut in den Sichtraum um das Sichtrad herum ausgetragen werden. Dies ist ungewünscht. Die Einbauten in den radial inneren zwei Drittel der Strömungskanäle, bezogen auf den Sichtradradius verhindern dies, indem der Wirbel durch die Einbauten radial nach innen begrenzt wird. Dadurch ist der Wirbel nicht nur innen begrenzt, sondern auch außen, nämlich durch die Einbauten, die den äußeren Sichtwirbel radial nach innen begrenzen.Flow simulations of deflector wheels with internals in the outer third of the flow channels show that in the flow channels of the classifier wheel, a second vortex forms in addition to the classifying vortex within the radially outer third of the classifying wheel radius. This second vortex sucks material - fines - out of the middle of the sifting wheel. In cooperation with the sifting vortex, fines can be discharged into the sifting space around the sifting wheel. This is undesirable. The built-in components in the radially inner two-thirds of the flow channels, based on the classifier wheel radius, prevent this by causing the vortex is limited radially inwards by the internals. As a result, the vortex is not only delimited on the inside, but also on the outside, namely by the internals that delimit the outer visual vortex radially inwards.
Es ist deshalb vorteilhaft, wenn in den radial inneren zwei Drittel der Sichtradschaufeln, bezogen auf den Sichtradradius, ebenfalls Einbauten in den Sichtradkanälen vorgesehen sind, die diese Wirbelbildung kontrollieren und räumlich begrenzen. Durch die Einbauten im radial inneren Bereich der Strömungskanäle kommt es zu einer gezielten und kontrollieren Wirbelablösung an diesen innenliegenden Einbauten. Dadurch wird verhindert, dass sich dieser Wirbel über den gesamten radialen Bereich der Strömungskanäle zwischen dem inneren Ende der Sichtradschaufeln und den Einbauten im äußeren Drittel der Strömungskanäle, bezogen auf den Sichtradradius, erstreckt. Dadurch können diese Einbauten das beobachtete Ausströmen bzw. Aussaugen von Sichtfluid und Partikeln aus der Sichtradmitte durch die Strömungskanäle nach außen aus dem Sichtrad heraus reduzieren.It is therefore advantageous if in the radially inner two-thirds of the classifying wheel blades, based on the classifying wheel radius, internals are also provided in the classifying wheel channels, which control and spatially limit this vortex formation. The internals in the radially inner area of the flow channels result in a targeted and controlled vortex shedding at these internal internals. This prevents this vortex from extending over the entire radial area of the flow channels between the inner end of the classifier wheel blades and the internals in the outer third of the flow channels, based on the classifier wheel radius. As a result, these built-in components can reduce the observed outflow or suction of classifying fluid and particles from the center of the classifying wheel through the flow channels to the outside of the classifying wheel.
Die Einbauten befinden sich vorzugsweise auf einer gemeinsamen radialen Kreisbahn, die etwa in einem Bereich, der innerhalb der inneren zwei Drittel des Sichtradradius liegt.The built-in components are preferably located on a common radial circular path, which is approximately in an area that lies within the inner two-thirds of the classifier wheel radius.
Als Strömungsbrecher im radial innenliegenden Bereich der Sichtradschaufeln dienen Einbauten, deren Querschnitte vorzugsweise eine mehreckige (z.B. quadratische, rechteckige, viereckige, dreieckige) oder runde Form besitzen oder eine Kombination davon und sich axial vorzugsweise über die gesamte axiale Höhe der Sichtradschaufeln bzw. der Strömungskanäle erstrecken. Es können jedoch, je nach Anwendungsfall, auch jegliche andere Querschnittsformen Anwendung finden.The flow breakers in the radially inner area of the classifier wheel blades are internals whose cross sections preferably have a polygonal (e.g. square, rectangular, quadrangular, triangular) or round shape or a combination thereof and preferably extend axially over the entire axial height of the classifier wheel blades or the flow channels . However, depending on the application, any other cross-sectional shape can also be used.
In alternativen Ausführungsformen erstrecken sich diese Einbauten nicht über die gesamte axiale Höhe der Sichtradschaufeln. In einer weiteren Ausführungsform befinden sich die Einbauten nicht auf einer gemeinsamen Kreisbahn um die Drehachse des Sichtrads.In alternative embodiments, these internals do not extend over the entire axial height of the classifier wheel blades. In a further embodiment, the internals are not on a common circular path around the axis of rotation of the classifier wheel.
In einer weiteren Ausführungsform ist der radiale Abstand dieser Einbauten zur Sichtradachse entlang der Höhe der Sichtradachse nicht konstant.In a further embodiment, the radial distance between these built-in components and the axis of the classifying wheel is not constant along the height of the axis of the classifying wheel.
In einer besonders bevorzugten Ausführungsvariante sind die Einbauten so gestaltet, dass sie den Strömungskanal von einer radial weiter außen liegenden Position zu einer radial weiter innenliegenden Position stetig verengen. Dies soll bedeuten, dass die Verengung ohne eine oder mehrere kantige Abstufungen erfolgt.In a particularly preferred embodiment variant, the internals are designed in such a way that they continuously narrow the flow channel from a radially further outward position to a radially further inward position. This is intended to mean that the narrowing occurs without one or more angular gradations.
Diese Einbauten können sich entweder auf beiden Seiten der Sichtradschaufeln befinden oder nur auf der in Sichtraddrehrichtung gesehenen Vorderseite oder Rückseite der Sichtradschaufeln.These internals can be located either on both sides of the classifier wheel blades or only on the front or rear side of the classifier wheel blades, viewed in the direction of rotation of the classifier wheel.
Eine bevorzugte Variante der Einbauten schließt auf der Innenseite der Sichtradschaufeln mit diesen in etwa bündig oder bündig ab.A preferred variant of the internals terminates on the inside of the classifying wheel blades approximately flush or flush with the latter.
Die Größe und Ausformung der Einbauten kann je nach Anwendungsfall variieren. Es ist auch eine Kombination von zwei oder mehr verschieden ausgeformten Einbauten möglich.The size and shape of the internals can vary depending on the application. A combination of two or more differently shaped internals is also possible.
Die Sichtradschaufeln und die Einbauten können aus einem Teil oder aus mehreren Teilen gefertigt sein.The classifier wheel blades and the internals can be made from one part or from several parts.
In einer besonders bevorzugten Ausgestaltung der Erfindung weist das Sichtrad in den Strömungskanälen zusätzlich Einbauten innerhalb des radial äußeren Drittels, bezogen auf den Sichtradradius, auf. Dadurch kann sowohl der radial außenliegende Sichtwirbel vorteilhaft für eine feine Sichtung beeinflusst werden als auch die Strömung in den Strömungskanälen stabilisiert werden. So sind beide Wirbel, beidseitig von Einbauten begrenzt.In a particularly preferred embodiment of the invention, the classifying wheel in the flow channels also has built-in components within the radially outer third, based on the classifying wheel radius. As a result, both the radially outer sifting vortex can be advantageously influenced for fine sifting and the flow in the flow channels can be stabilized. So both vortices are bounded on both sides by internals.
In einer weiteren Ausgestaltung der Erfindung sind die Einbauten als Bleche mit Bohrungen oder Durchbrechungen ausgeführt und ragen über die gesamte Höhe und Breite der Strömungskanäle. Sie sind in den Strömungskanälen angeordnet. Die Bleche folgen in ihrer Kontur bevorzugt der Kreisbahn um die Drehachse des Sichtrades, auf der sie angeordnet sind. Die Bleche haben einen konstanten Abstand zu Sichtradachse. Der Abstand ist kleiner als zwei Drittel des Sichtradradius Auch diese Art der Einbauten begrenzen dem Wirbel nach innen.In a further embodiment of the invention, the internals are designed as metal sheets with bores or openings and protrude over the entire height and width of the flow channels. They are arranged in the flow channels. The contours of the metal sheets preferably follow the circular path around the axis of rotation of the classifying wheel on which they are arranged. The sheets have a constant distance to the classifying wheel axis. The distance is less than two thirds of the radius of the separator wheel. This type of internals also limits the vortex inwards.
Die Haltescheiben, zwischen denen die Sichtradschaufeln angeordnet sind, können als Nabenscheibe oder Deckscheibe ausgebildet sein. Die Deckscheibe ist bei einem einflutigen Sichtrad mit einem Feingutaustritt versehen. Sie ist bevorzugt ringförmig ausgestaltet.The retaining disks, between which the classifying wheel blades are arranged, can be designed as hub disks or cover disks. In the case of a single-flow classifying wheel, the cover disk is provided with a fines outlet. It is preferably designed in the form of a ring.
Des Weiteren kann das erfindungsgemäße Sichtrad sowohl einflutig als auch 2-flutig ausgeführt sein.Furthermore, the classifying wheel according to the invention can be designed either as a single-flow or as a double-flow.
Ein zweiflutiges Sichtrad lässt sich aus zwei einflutigen Sichträdern zusammensetzen. Dabei werden die Sichträder an ihren Deckscheiben zusammengebaut, sodass sie eine gemeinsame Drehachse aufweisen. Das zweiflutige Sichtrad weist nun zwei Nabenscheiben auf und ist beidseitig im Gehäuse des Zentrifugalkraft-Windsichters gelagert. Die beiden Nabenscheiben weisen Durchbrechungen auf, die die Feingutaustritte darstellen. In einer weiteren Ausführungsform eines zweiflutigen Sichtrads entfallen die Deckscheiben in der Mitte des Sichtrades, sodass es einen durchgehenden Innenbereich aufweist.A double-flow classifying wheel can be composed of two single-flow classifying wheels. The classifying wheels are assembled on their cover disks so that they have a common axis of rotation. The double-flow sifter wheel now has two hub disks and is mounted on both sides in the housing of the centrifugal air sifter. The two hub disks have openings that represent the outlets for the fines. In a further embodiment of a double-flow classifying wheel, the cover disks in the middle of the classifying wheel are omitted, so that it has a continuous interior area.
Die Einbauten a im radial äußersten Bereichs der Sichtradschaufeln führen dazu, dass der Impuls des einströmenden Fluids effizienter in eine Geschwindigkeitsüberhöhung im Sichtwirbel umgesetzt wird, als bei dem in der Patentschrift
Die Varianten, die durch Knicke und Kanten unstetige Verläufe der besonders ausgeformten Sichtradschaufeln aufweisen, sind aufgrund von Verlusten beim Impulsaustausch nicht so effizient wie Varianten mit stetigen Konturen. Da die Varianten mit geknickten Sichtschaufelenden den Impuls des anströmenden Fluids nicht so effizient umsetzen, sind dort die Geschwindigkeitsüberhöhungen im Vergleich zu stetigen Konturen niedriger.The variants, which have discontinuous profiles of the specially shaped classifying wheel blades due to kinks and edges, are not as efficient as variants with continuous contours due to losses in momentum exchange. Since the variants with kinked ends of the separator vane do not convert the momentum of the inflowing fluid as efficiently, the speed increases are lower there in comparison to continuous contours.
Durch ein Sichtrad mit den erfindungsgemäßen Einbauten in den Strömungskanälen zur Auslassseite hin, konnte die Strömung im Sichtrad stabilisiert werden und der Feinheitsbereich von Sichtern zu kleineren Feinheiten hin verbessert werden.The flow in the classifying wheel could be stabilized and the fineness range of classifiers could be improved towards smaller finenesses by means of a classifying wheel with the installations according to the invention in the flow channels towards the outlet side.
Weitere Einzelheiten, Merkmale und Vorteile des Gegenstandes der Erfindung ergeben sich aus den Unteransprüchen sowie aus der nachfolgenden Beschreibung der zugehörigen Zeichnungen, in der -beispielhaft- ein bevorzugtes Ausführungsbeispiel der Erfindung dargestellt ist. In der Zeichnung zeigt:
-
Figur 1 : Ansicht im Meridianschnitt des erfindungsgemäßen Sichtrades -
Figur 2 : Ausschnitt im Achsnormalschnitt des erfindungsgemäßen Sichtrades mit Strömungskanälen mit inneren Einbauten -
Figur 3 : Ausschnitt im Achsnormalschnitt des erfindungsgemäßen Sichtrades mit Strömungskanälen mit inneren Einbauten die mit den Sichtradschaufelenden abschließen. -
Figur 4 : Ausschnitt im Achsnormalschnitt des erfindungsgemäßen Sichtrades mit Strömungskanälen mit inneren Einbauten die zusammen mit den Sichtradschaufeln eine Spitze bilden.
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figure 1 : View in meridian section of the classifying wheel according to the invention -
figure 2 : Detail in the axis normal section of the separator wheel according to the invention with flow channels with internal fittings -
figure 3 : Section in the axial normal section of the separator wheel according to the invention with flow channels with internal fittings which end with the separator wheel blade ends. -
figure 4 : Section in the axis normal section of the separator wheel according to the invention with flow channels with internal fittings which form a tip together with the separator wheel blades.
Die
In den
Die Sichtradschaufeln (3) verlaufen im radial äußeren Drittel, des Sichtradradius, nicht exakt in radialer Richtung, sondern sind in einem Winkel zur radialen Richtung entgegen der Rotationsrichtung geneigt angeordnet. In den inneren zwei Dritteln sind sie radial ausgerichtet.The classifying wheel blades (3) do not run exactly in the radial direction in the radially outer third, the classifying wheel radius, but are arranged inclined at an angle to the radial direction counter to the direction of rotation. In the inner two-thirds they are aligned radially.
Durch diese Kombination von innenliegenden Einbauten (7) und außenliegenden Einbauten (5), bilden sich zwei Wirbel entgegengesetzter Drehrichtung aus.This combination of internal fittings (7) and external fittings (5) creates two vortices in opposite directions of rotation.
Der innere Wirbel wird beidseitig durch die Einbauten (5, 7) begrenzt. Es kommt nicht mehr zu einem Ausströmen des Fluids mit Partikeln aus der Sichtradmitte nach Außen in den Sichtraum um das Sichtrad, wodurch eine Stabilisierung der Sichtraddurchströmung erreicht wird. Der Verlauf des ungestörten Feingutstroms von außen nach innen ist durch den dicken Pfeil in den
Die Einbauten (7) befinden sich vorzugsweise auf einer gemeinsamen radialen Kreisbahn, die in einem Bereich, der innerhalb der inneren zwei Drittel des Sichtradradius liegt.The built-in components (7) are preferably located on a common radial circular path, which is in an area that lies within the inner two-thirds of the classifying wheel radius.
In
Sie erstrecken sich über die gesamte axiale Höhe des Sichtrads (10).They extend over the entire axial height of the classifying wheel (10).
In
- Sichtradnabe (1)classifying wheel hub (1)
- Nabenscheibe (2)hub disc (2)
- Sichtradschaufeln (3)Classifier Blades (3)
- Deckscheibe (4)cover plate (4)
- Einbauten (5, 7)Internals (5, 7)
- Strömungskanäle (6)flow channels (6)
- Sichtrad (10)classifying wheel (10)
Claims (11)
die Strömungskanäle (6) in Richtung der Drehachse des Sichtrades zusätzlich Einbauten (7) aufweisen, welche in den radial inneren zwei Dritteln des Strömungskanals (6), bezogen auf den Sichtradradius, angeordnet sind.Classifier wheel (10) for a centrifugal air classifier,
the flow ducts (6) have additional installations (7) in the direction of the axis of rotation of the classifying wheel, which are arranged in the radially inner two-thirds of the flow duct (6), based on the radius of the classifying wheel.
durch Einbauten (5, 7) an den Sichtradschaufeln (3) im Bereich innerhalb des äußeren Drittels und innerhalb der radial inneren zwei Drittel des Strömungskanals (6), bezogen auf den Sichtradradius, dafür gesorgt wird, dass die Wirbel, die sich in dem in die Strömungskanäle (3) einströmenden Sichtfluid radial vor den radial äußeren Einbauten (5) und zwischen dieser und den weiter innenliegenden Einbauten (7) bildet, unterschiedliche Drehrichtungen aufweisen.Method for separating sifting material dispersed in a sifting fluid into a fine and a coarse fraction with a rotary-driven sifting wheel (10) for a centrifugal air sifter,
built-in components (5, 7) on the classifier blades (3) in the area within the outer third and inside the radially inner two-thirds of the flow channel (6), in relation to the classifier wheel radius, ensure that the vortices that accumulate in the in which forms the flow channels (3) for the inflowing classifying fluid radially in front of the radially outer built-in components (5) and between this and the further inner built-in components (7), have different directions of rotation.
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DE102021001239.9A DE102021001239B4 (en) | 2021-03-09 | 2021-03-09 | Device and method for screening dusty goods |
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EP4059624B1 EP4059624B1 (en) | 2023-10-04 |
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EP (1) | EP4059624B1 (en) |
DE (1) | DE102021001239B4 (en) |
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Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0226682A (en) * | 1988-07-18 | 1990-01-29 | Babcock Hitachi Kk | Grinding and classifying apparatus |
US5055182A (en) * | 1989-01-12 | 1991-10-08 | Krupp Polysius Ag | Separator |
EP0983802A2 (en) | 1998-09-04 | 2000-03-08 | HOSOKAWA ALPINE Aktiengesellschaft & Co. OHG | Classifying rotor for a centrifugal pneumatic separator |
-
2021
- 2021-03-09 DE DE102021001239.9A patent/DE102021001239B4/en active Active
-
2022
- 2022-03-03 ES ES22000047T patent/ES2966594T3/en active Active
- 2022-03-03 EP EP22000047.5A patent/EP4059624B1/en active Active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0226682A (en) * | 1988-07-18 | 1990-01-29 | Babcock Hitachi Kk | Grinding and classifying apparatus |
US5055182A (en) * | 1989-01-12 | 1991-10-08 | Krupp Polysius Ag | Separator |
EP0983802A2 (en) | 1998-09-04 | 2000-03-08 | HOSOKAWA ALPINE Aktiengesellschaft & Co. OHG | Classifying rotor for a centrifugal pneumatic separator |
DE19840344A1 (en) | 1998-09-04 | 2000-05-04 | Hosokawa Alpine Ag & Co | Classifying wheel for a centrifugal air classifier |
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DE102021001239B4 (en) | 2024-03-21 |
EP4059624B1 (en) | 2023-10-04 |
DE102021001239A1 (en) | 2022-09-15 |
ES2966594T3 (en) | 2024-04-23 |
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