EP0918573A1 - Air classifier with centrifugal action - Google Patents

Air classifier with centrifugal action

Info

Publication number
EP0918573A1
EP0918573A1 EP97918235A EP97918235A EP0918573A1 EP 0918573 A1 EP0918573 A1 EP 0918573A1 EP 97918235 A EP97918235 A EP 97918235A EP 97918235 A EP97918235 A EP 97918235A EP 0918573 A1 EP0918573 A1 EP 0918573A1
Authority
EP
European Patent Office
Prior art keywords
rotor
blades
section
separator according
channels
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
EP97918235A
Other languages
German (de)
French (fr)
Other versions
EP0918573B1 (en
Inventor
Alain Cordonnier
Danielle Lemaire
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.)
FCB Ciment
Original Assignee
F C B
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by F C B filed Critical F C B
Priority to DK97918235T priority Critical patent/DK0918573T3/en
Publication of EP0918573A1 publication Critical patent/EP0918573A1/en
Application granted granted Critical
Publication of EP0918573B1 publication Critical patent/EP0918573B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B07B11/04—Control arrangements

Definitions

  • the present invention relates to a pneumatic separator with centrifugal action intended to classify a granular material into a fine fraction and a coarse fraction and comprising a rotor with vertical axis provided with blades regularly distributed on its periphery, guide vanes arranged around the rotor, according to the generators of a fictitious cylinder, and capable of communicating to a current of air or other gas entering said fictitious cylinder a rotational movement around the axis of said cylinder, and an envelope in which the rotor and the guide vanes and which is provided with one or more inlets for air and for the material to be classified, an outlet orifice placed above or below the rotor and through which the charged air stream is drawn of the fine fraction of the material and at least one outlet for the coarse fraction, the air entering the rotor at its periphery, through the channels formed between the blades, and circulating nt inside the rotor to the outlet.
  • the material to be classified and the air stream can be introduced separately inside the annular section space delimited by the guide vanes and the rotor, or the material to be classified can be suspended in the air stream before it is admitted into said space, through the blades; the air stream then enters the rotor and is discharged through the outlet.
  • the air stream and the material to be classified are rotated around the axis of the rotor in the annular section space between the rotor and the guide vanes.
  • the particles constituting the coarse fraction of the material are projected by the centrifugal force generated by this rotation against the guide vanes and fall by gravity into a collecting hopper provided with an evacuation orifice, while the particles constituting the fine fraction are entrained by the air flow through the rotor and the central outlet.
  • the separated fine fraction contains practically all the particles whose size is smaller than a first dimension while the coarse fraction contains practically all the particles whose size is larger than a second dimension, larger than the first.
  • the two fractions contain particles whose size is between the first and second dimensions. This results in a partition curve comprising two substantially horizontal portions connected by an inclined portion whose slope characterizes the separator.
  • the distribution of particles of intermediate size in one or the other of the fractions characterizes the cutting precision of the separator. In general, it is sought to obtain, by construction, a cut as clear as possible between the two fractions, that is to say to reduce the difference between the first and second dimensions, which results in a curve of steep slope sharing.
  • the product which one seeks to obtain must have a particle size distribution different from that of the fraction, fine or coarse, obtained by means of a separator of this type. This is in particular the case of the cement obtained by crushing by compression of the clinker.
  • the only solution to solve this problem was to use two separators placed in series or in parallel and adjusted for different cutout dimensions. This solution is expensive.
  • the object of the present invention is to improve the separators of the type concerned so that it is possible to adjust the slope of the partition curve in a simple manner, that is to say to modify the particle size distribution of the particles whose the size is between the first and second dimensions.
  • the separator object of the invention is characterized in that the air circulating in the rotor is divided into at least two separate streams, and the rotor is equipped with means for adjusting the speed and / or the flow rate of at least one currents. If the velocities of the two air streams in the channels formed between the rotor blades are set to different values, the drag forces exerted by the two streams on a particle of given mass and dimensions will be different; in the channels where the air current circulates at reduced speed, the balance between the drag forces and the centrifugal forces, which corresponds to the theoretical cut-off mesh, will occur for a smaller particle size than that for which this balance occurs in other channels where the air speed is higher.
  • the means for adjusting the speed and / or the flow of the air currents can be constituted by means for varying the inlet section of at least some of the channels formed between the blades of the rotor and / or by means to vary the passage section of the openings through which the air currents escape from the rotor.
  • the rotor is divided into sectors by vertical partitions arranged radially and each sector communicates with the air outlet orifice through an opening provided with means for adjusting the passage section which may be formed, for example, by pivoting shutters or diaphragms; in this embodiment, the radial partitions fulfill the anti-vortex function of the second set of blades of the separator which is the subject of French patent n ° 90 01673 in the name of the applicant.
  • each plate being movable, for example by rotation about an axis parallel to the axis of the rotor, between a first position where it leaves practically the entire section of the respective channel free, and a second position where it virtually completely closes the channel.
  • certain blades of the rotor can be orientable around vertical axes so that their ends can come to bear on a neighboring blade to close the channel which they delimit.
  • Another solution consists in making the blades in two parts: a fixed part and a mobile part, which can be rotated around a vertical axis.
  • a fixed part For example, one of the faces of the blade can be fixed and the other movable and able to pivot around a vertical axis located near the periphery of the rotor to come to bear on the neighboring blade to close the channel that 'they form.
  • the radially outer part of the blade can be fixed and its inner part rotatable, the movable parts of two adjacent blades can be brought into abutment against one another to close the channel delimited by the two blades.
  • Figure 1 is a diametrical sectional view of a separator rotor according to the invention
  • Figure 2 is a top view of the rotor of Figure 1, the ring partially closing the rotor at its upper part having been removed on one half of the rotor;
  • Figure 3 is an enlarged view of a detail of the rotor
  • Figures 4 and 5 are views similar to Figure 3 illustrating alternative embodiments
  • Figure 6 is a diametrical sectional view of another separator rotor according to the invention.
  • Figure 7 shows the partition curves of a conventional separator and the separator object of the invention.
  • the separator which is the subject of the invention is of the type described in French patent n ° 90.01673 to which reference may be made for more details. As described above, it comprises a rotor with a vertical axis, guide vanes arranged around the rotor and an envelope in which the rotor and the guide vanes are enclosed and which is provided with one or more inlets for the product to be classified and for the air stream, one or more outlets for the coarse fraction and a central outlet for the air stream charged with the fine fraction of the product.
  • the rotor 10 is fixed to the lower end of a vertical shaft 11 mounted, by means of rolling bearings, in a tubular support 12 fixed to the ceiling of the envelope of the separator.
  • the shaft is coupled to a variable speed control group allowing the rotor to rotate at the desired speed.
  • the rotor has a large number of vertical blades 14 regularly spaced around its periphery and whose lower and upper ends are fixed, respectively, on a bottom 16 and on a ring 18.
  • a cylindrical ferrule 20 fixed on the inner edge of the ring 18 defines an outlet passage for the air charged with particles of small dimensions which have entered the rotor through the channels 15 formed between the blades 14. This ferrule is connected, by a rotating joint, to the lower end of a discharge duct 22 passing through the ceiling of the separator casing.
  • the interior of the rotor is divided into four equal sectors by four vertical partitions 24 arranged radially. These partitions are fixed on the bottom 16, on the ring 18 and on a ferrule 26 surrounding the lower part of the tubular support 12 and itself fixed on the bottom 16.
  • the outlet opening delimited by the ring 18 and the ferrule 26 is partially closed by pivoting flaps 28 (two by sector in the embodiment shown).
  • Each flap is fixed on a shaft 30 mounted on bearings fixed on the ring 18 and the ferrule 26.
  • a square provided at the outer end of each shaft 30 makes it possible to adjust the orientation of the flaps and, consequently, the section of the exit opening of the respective sectors, and a locking system keeps the shutters in the desired position, after adjustment.
  • one blade 14 out of two is formed by a fixed part 31 constituting the active face and a movable part 32 orientable around a vertical axis 33 located near the edge blade attack (see Figure 3).
  • This part 32 is movable, between a first position (represented by a solid line in FIG. 3) where it is pressed against the fixed part 31 of the blade, so as to leave free the entry of the channel 15, and a second position (shown in dashed lines) where it closes completely this entry.
  • the orientation of the moving parts of the blades can be controlled individually or in groups. These two-part blades must be distributed over the periphery of the rotor so that it is balanced.
  • FIG. 4 shows another embodiment of the means for closing off certain channels 15 of the rotor.
  • the two blades delimiting a channel are in two parts: an external part 31 'which is rigidly fixed to the structure of the rotor and a lower part 32' which is able to pivot around a vertical axis 33 '.
  • a control mechanism, not shown makes it possible to move the movable part 32 'of each blade between two positions: a first position, shown in solid lines in FIG.
  • the means for closing the channels consist of pairs of vertical plates 40 placed inside the rotor, the two plates of a pair being articulated by their inner edge on the same vertical axis. 42 disposed in the median plane of the channel.
  • a cam 44 placed between the two plates and controlled by an appropriate mechanism makes it possible to separate the two plates to bring their free end into abutment against the blades 14 and close the outlet of the channel 15, as shown in solid line in the figure.
  • the cam is rotated to bring it into the median plane of the channel, the plates 40 are pressed against the cam by centrifugal force, as shown in phantom in the figure, and the outlet of the channel 15 is almost completely clear .
  • certain blades 14 could be orientable by being mounted so as to be able to pivot on the rotor around vertical axes located near their leading edge and to abut against the adjacent fixed or orientable blades to close off the corresponding channels 15.
  • the separator In service, the separator is incorporated in a circuit, open or closed, where a gas flow, for example an air flow, circulates.
  • a gas flow for example an air flow
  • the air stream Upon entering the rotor, the air stream is divided into as many elementary streams as there are channels 15 between the blades 14.
  • these elementary streams are grouped in each sector of the rotor into four secondary streams which escape through the outlet opening delimited by the ring 18 and the ferrule 26. If all the flaps 28 are in the vertical position and if all the channels 15 are open, the flow rates of the four secondary currents are equal and the speeds elementary currents are equal; the operation of the separator is the same as that of a classic separator.
  • the particle size for which the centrifugal and drag forces are balanced (theoretical cutoff mesh) will be larger in the first sector than in the others. Everything therefore happens as if we had two separators in parallel working with different cut-off meshes and whose fine fractions would be mixed at the exit of the separator.
  • FIG. 7 shows by way of example the partition curves of a conventional separator, for two cut-off meshes, and of a separator according to the invention.
  • the partition curve gives the weight proportion, expressed in%, of the particles of given size in the coarse fraction; we would get an inverted curve for the fine fraction.
  • the three curves are combined.
  • the dashed curve corresponds to a conventional separator whose theoretical cutoff mesh is 50 ⁇ m
  • that in dotted lines corresponds to a conventional separator whose theoretical cutoff mesh is 105 ⁇ m.
  • the curve in solid line was obtained with the separator of the invention; it can be seen that its slope is lower than that of conventional separators, which means that in the range 20-200 ⁇ m, the particle size is more spread out.
  • the invention therefore makes it possible to have a partition curve with adjustable slope and, consequently, to obtain a finished product having the desired particle size distribution in a given particle size range by varying both the speed of the rotor and the orientation.
  • the rotor could be designed as shown in FIG.
  • the rotor is provided with means such as those illustrated in FIGS. 3, 4 and 5 for closing off some of the channels formed between its blades, over at least part of their height, and with means such as flaps 28 for adjusting at least one outlet openings.
  • the rotor could be divided into more than two superimposed parts.
  • Means other than pivoting flaps, for example diaphragms, could be used to adjust the section of the outlet openings of the rotor.

Landscapes

  • Centrifugal Separators (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Lubricants (AREA)
  • Glass Compositions (AREA)
  • Cyclones (AREA)

Abstract

A centrifugal type pneumatic separator having a rotor and a housing. The rotor has a plurality of vanes distributed around a periphery thereof. The housing contains the rotor. The housing has an air input conduit, a material input conduit and an evacuation conduit. The air input conduit passes air through channels formed between adjacent vanes such that air and material flows toward the evacuation conduit. The rotor is divided so as to define at least two separate passages whereby air from the air input conduit flows toward the evacuation conduit as two separate and parallel streams.

Description

Titre : Séparateur à air à action centrifuge.Title: Air separator with centrifugal action.
La présente invention a pour objet un séparateur pneumatique à action centrifuge destiné à classer un matériau granulaire en une fraction fine et une fraction grossière et comportant un rotor à axe vertical muni de pales régulièrement réparties sur sa périphérie, des aubes directrices disposées autour du rotor, suivant les génératrices d'un cylindre fictif, et aptes à communiquer à un courant d'air ou autre gaz pénétrant dans ledit cylindre fictif un mouvement de rotation autour de l'axe dudit cylindre, et une enveloppe dans laquelle sont enfermés le rotor et les aubes directrices et qui est munie d'une ou plusieurs entrées pour l'air et pour le matériau à classer, d'un orifice de sortie disposé au-dessus ou au-dessous du rotor et par où est aspiré le courant d'air chargé de la fraction fine du matériau et d'au moins une sortie pour la fraction grossière, l'air pénétrant dans le rotor à sa périphérie, par les canaux formés entre les pales, et circulant à l'intérieur du rotor vers l'orifice de sortie.The present invention relates to a pneumatic separator with centrifugal action intended to classify a granular material into a fine fraction and a coarse fraction and comprising a rotor with vertical axis provided with blades regularly distributed on its periphery, guide vanes arranged around the rotor, according to the generators of a fictitious cylinder, and capable of communicating to a current of air or other gas entering said fictitious cylinder a rotational movement around the axis of said cylinder, and an envelope in which the rotor and the guide vanes and which is provided with one or more inlets for air and for the material to be classified, an outlet orifice placed above or below the rotor and through which the charged air stream is drawn of the fine fraction of the material and at least one outlet for the coarse fraction, the air entering the rotor at its periphery, through the channels formed between the blades, and circulating nt inside the rotor to the outlet.
Dans un séparateur de ce type le matériau à classer et le courant d'air peuvent être introduits séparément à l'intérieur de l'espace à section annulaire délimité par les aubes directrices et le rotor, ou le matériau à classer peut être mis en suspension dans le courant d'air avant que celui-ci ne soit admis dans ledit espace, à travers les aubes ; le courant d'air pénètre ensuite dans le rotor et est évacué par l'orifice de sortie.In a separator of this type the material to be classified and the air stream can be introduced separately inside the annular section space delimited by the guide vanes and the rotor, or the material to be classified can be suspended in the air stream before it is admitted into said space, through the blades; the air stream then enters the rotor and is discharged through the outlet.
Dans les deux cas, le courant d'air et le matériau à classer sont soumis à une rotation, autour de l'axe du rotor, dans l'espace à section annulaire compris entre le rotor et les aubes directrices. Les particules constituant la fraction grossière du matériau sont projetées par la force centrifuge engendrée par cette rotation contre les aubes directrices et tombent par gravité dans une trémie collectrice munie d'un orifice d'évacuation, tandis que les particules constituant la fraction fine sont entraînées par le courant d'air à travers le rotor et l'orifice de sortie central.In both cases, the air stream and the material to be classified are rotated around the axis of the rotor in the annular section space between the rotor and the guide vanes. The particles constituting the coarse fraction of the material are projected by the centrifugal force generated by this rotation against the guide vanes and fall by gravity into a collecting hopper provided with an evacuation orifice, while the particles constituting the fine fraction are entrained by the air flow through the rotor and the central outlet.
La fraction fine séparée contient pratiquement toutes les particules dont la taille est inférieure à une première dimension tandis que la fraction grossière contient pratiquement toutes les particules dont la taille est supérieure à une seconde dimension, plus grande que la première. En plus, les deux fractions contiennent des particules dont la taille est comprise entre les première et seconde dimensions. Cela se traduit par une courbe de partage comportant deux portions sensiblement horizontales reliées par une portion inclinée dont la pente caractérise le séparateur.The separated fine fraction contains practically all the particles whose size is smaller than a first dimension while the coarse fraction contains practically all the particles whose size is larger than a second dimension, larger than the first. In addition, the two fractions contain particles whose size is between the first and second dimensions. This results in a partition curve comprising two substantially horizontal portions connected by an inclined portion whose slope characterizes the separator.
La distribution des particules de taille intermédiaire dans l'une ou l'autre des fractions caractérise la précision de coupure du séparateur. En général, on cherche à obtenir, par construction, une coupure aussi nette que possible entre les deux fractions, c'est-à-dire à réduire l'écart entre les première et seconde dimensions, ce qui se traduit par une courbe de partage à pente raide.The distribution of particles of intermediate size in one or the other of the fractions characterizes the cutting precision of the separator. In general, it is sought to obtain, by construction, a cut as clear as possible between the two fractions, that is to say to reduce the difference between the first and second dimensions, which results in a curve of steep slope sharing.
Dans certains cas, le produit que l'on cherche à obtenir doit avoir une distribution granulométrique différente de celle de la fraction, fine ou grossière, obtenue au moyen d'un séparateur de ce type. C'est en particulier le cas du ciment obtenu par broyage par compression du clinker. Jusqu'ici, la seule solution pour résoudre ce problème était d'utiliser deux séparateurs placés en série ou en parallèle et réglés pour des dimensions de coupure différentes. Cette solution est coûteuse.In certain cases, the product which one seeks to obtain must have a particle size distribution different from that of the fraction, fine or coarse, obtained by means of a separator of this type. This is in particular the case of the cement obtained by crushing by compression of the clinker. Until now, the only solution to solve this problem was to use two separators placed in series or in parallel and adjusted for different cutout dimensions. This solution is expensive.
Le but de la présente invention est de perfectionner les séparateurs du type concerné de façon qu'il soit possible d'ajuster de façon simple la pente de la courbe de partage, c'est-à- dire de modifier la distribution granulométrique des particules dont la taille est comprise entre les première et seconde dimensions.The object of the present invention is to improve the separators of the type concerned so that it is possible to adjust the slope of the partition curve in a simple manner, that is to say to modify the particle size distribution of the particles whose the size is between the first and second dimensions.
Le séparateur objet de l'invention est caractérisé en ce que l'air circulant dans le rotor est divisé en au moins deux courants distincts, et le rotor est équipé de moyens de réglage de la vitesse et/ou du débit d'au moins un des courants. Si les vitesses des deux courants d'air dans les canaux ménagés entre les pales du rotor sont réglées à des valeurs différentes, les forces de traînée exercées par les deux courants sur une particule de masse et dimensions données seront différentes ; dans les canaux où le courant d'air circule à vitesse réduite, l'équilibre entre les forces de traînée et les forces centrifuges, qui correspond à la maille théorique de coupure, se produira pour une dimension des particules plus faible que celle pour laquelle cet équilibre se produit dans les autres canaux où la vitesse de l'air est plus élevée. Tout se passera donc comme si on avait deux séparateurs en parallèle ayant des mailles de coupure différentes ; en réglant les vitesses des courants d'air, on pourra ajuster les mailles de coupure et, par conséquent, la distribution granulométrique des particules dans le produit fini. Les moyens de réglage de la vitesse et/ou du débit des courants d'air peuvent être constitués par des moyens pour faire varier la section d'entrée d'au moins certains des canaux ménagés entre les pales du rotor et/ou par des moyens pour faire varier la section de passage des ouvertures par lesquelles les courants d'air s'échappent du rotor.The separator object of the invention is characterized in that the air circulating in the rotor is divided into at least two separate streams, and the rotor is equipped with means for adjusting the speed and / or the flow rate of at least one currents. If the velocities of the two air streams in the channels formed between the rotor blades are set to different values, the drag forces exerted by the two streams on a particle of given mass and dimensions will be different; in the channels where the air current circulates at reduced speed, the balance between the drag forces and the centrifugal forces, which corresponds to the theoretical cut-off mesh, will occur for a smaller particle size than that for which this balance occurs in other channels where the air speed is higher. Everything will therefore happen as if we had two separators in parallel with different cutoff meshes; by adjusting the speeds of the air currents, it will be possible to adjust the cut-off meshes and, consequently, the particle size distribution of the particles in the finished product. The means for adjusting the speed and / or the flow of the air currents can be constituted by means for varying the inlet section of at least some of the channels formed between the blades of the rotor and / or by means to vary the passage section of the openings through which the air currents escape from the rotor.
Suivant une forme de réalisation particulière, le rotor est divisé en secteurs par des cloisons verticales disposées radialement et chaque secteur communique avec l'orifice de sortie d'air par une ouverture munie de moyens de réglage de la section de passage qui pourront être constitués, par exemple, par des volets pivotants ou des diaphragmes ; dans cette forme de réalisation les cloisons radiales remplissent la fonction anti-vortex du second jeu de pales du séparateur objet du brevet français n° 90 01673 au nom du demandeur,. Pour faire varier la section des canaux formés entre les pales du rotor, on pourra utiliser des plaques disposées dans lesdits canaux, chaque plaque étant mobile, par exemple par rotation autour d'un axe parallèle à l'axe du rotor, entre une première position où elle laisse libre pratiquement toute la section du canal respectif, et une seconde position où elle obture pratiquement complètement le canal.According to a particular embodiment, the rotor is divided into sectors by vertical partitions arranged radially and each sector communicates with the air outlet orifice through an opening provided with means for adjusting the passage section which may be formed, for example, by pivoting shutters or diaphragms; in this embodiment, the radial partitions fulfill the anti-vortex function of the second set of blades of the separator which is the subject of French patent n ° 90 01673 in the name of the applicant. To vary the section of the channels formed between the blades of the rotor, it is possible to use plates arranged in said channels, each plate being movable, for example by rotation about an axis parallel to the axis of the rotor, between a first position where it leaves practically the entire section of the respective channel free, and a second position where it virtually completely closes the channel.
On pourra, par exemple, placer à la sortie du canal deux plaques montées pivotantes sur un axe vertical disposé dans le plan médian du canal, ces plaques pourront être amenées, par un mécanisme approprié, d'une première position où elles sont plaquées l'une contre l'autre et disposées pratiquement dans ledit plan médian dans une seconde position où leurs extrémités libres sont en butée contre l'extrémité des pales délimitant le canal.We can, for example, place at the outlet of the channel two plates pivotally mounted on a vertical axis disposed in the median plane of the channel, these plates can be brought, by an appropriate mechanism, from a first position where they are pressed the one against the other and arranged practically in said median plane in a second position where their free ends are in abutment against the end of the blades delimiting the channel.
En variante, certaines pales du rotor peuvent être orientables autour d'axe verticaux de façon que leurs extrémités puissent venir s'appuyer sur une pale voisine pour obturer le canal qu'elles délimitent.As a variant, certain blades of the rotor can be orientable around vertical axes so that their ends can come to bear on a neighboring blade to close the channel which they delimit.
Une autre solution consiste à réaliser les pales en deux parties : une partie fixe et une partie mobile, orientable par rotation autour d'un axe vertical. Par exemple, l'une des faces de la pale peut être fixe et l'autre mobile et apte à pivoter autour d'un axe vertical situé près de la périphérie du rotor pour venir s'appuyer sur la pale voisine pour obturer le canal qu'elles forment. Selon une autre forme de réalisation, la partie radialement extérieure de la pale peut être fixe et sa partie intérieure rotative, les parties mobiles de deux pales voisines pouvant être amenées en butée l'une contre l'autre pour fermer le canal délimité par les deux pales.Another solution consists in making the blades in two parts: a fixed part and a mobile part, which can be rotated around a vertical axis. For example, one of the faces of the blade can be fixed and the other movable and able to pivot around a vertical axis located near the periphery of the rotor to come to bear on the neighboring blade to close the channel that 'they form. According to another embodiment, the radially outer part of the blade can be fixed and its inner part rotatable, the movable parts of two adjacent blades can be brought into abutment against one another to close the channel delimited by the two blades.
D'autres caractéristiques de l'objet de l'invention apparaîtront à la lecture de la description qui suit et se réfère aux dessins l'accompagnant qui montrent, à titre d'exemple non limitatif, plusieurs formes de réalisation de l'invention. Sur ces dessins :Other characteristics of the object of the invention will appear on reading the description which follows and refers to the accompanying drawings which show, by way of nonlimiting example, several embodiments of the invention. In these drawings:
La figure 1 est une vue en coupe diamétrale d'un rotor de séparateur conforme à l'invention ;Figure 1 is a diametrical sectional view of a separator rotor according to the invention;
La figure 2 est une vue de dessus du rotor de la figure 1, l'anneau fermant partiellement le rotor à sa partie supérieure ayant été enlevé sur une moitié du rotor ;Figure 2 is a top view of the rotor of Figure 1, the ring partially closing the rotor at its upper part having been removed on one half of the rotor;
La figure 3 est une vue à plus grande échelle d'un détail du rotor ;Figure 3 is an enlarged view of a detail of the rotor;
Les figures 4 et 5 sont des vues analogues à la figure 3 illustrant des variantes de réalisation ;Figures 4 and 5 are views similar to Figure 3 illustrating alternative embodiments;
La figure 6 est une vue en coupe diamétrale d'un autre rotor de séparateur conforme à l'invention ; etFigure 6 is a diametrical sectional view of another separator rotor according to the invention; and
La figure 7 montre les courbes de partage d'un séparateur classique et du séparateur objet de l'invention. Le séparateur objet de l'invention est du type décrit dans le brevet français n° 90.01673 auquel on pourra se référer pour plus de détails. Comme décrit plus haut, il comporte un rotor à axe vertical, des aubes directrices disposées autour du rotor et une enveloppe dans laquelle sont enfermés le rotor et les aubes directrices et qui est munie d'une ou plusieurs entrées pour le produit à classer et pour le courant d'air, une ou plusieurs sorties pour la fraction grossière et un orifice de sortie central pour le courant d'air chargé de la fraction fine du produit.Figure 7 shows the partition curves of a conventional separator and the separator object of the invention. The separator which is the subject of the invention is of the type described in French patent n ° 90.01673 to which reference may be made for more details. As described above, it comprises a rotor with a vertical axis, guide vanes arranged around the rotor and an envelope in which the rotor and the guide vanes are enclosed and which is provided with one or more inlets for the product to be classified and for the air stream, one or more outlets for the coarse fraction and a central outlet for the air stream charged with the fine fraction of the product.
Le rotor 10 est fixé à l'extrémité inférieure d'un arbre vertical 11 monté, par l'intermédiaire de paliers à roulements, dans un support tubulaire 12 fixé sur le plafond de l'enveloppe du séparateur. L'arbre est accouplé à un groupe de commande à vitesse variable permettant de faire tourner le rotor à la vitesse voulue.The rotor 10 is fixed to the lower end of a vertical shaft 11 mounted, by means of rolling bearings, in a tubular support 12 fixed to the ceiling of the envelope of the separator. The shaft is coupled to a variable speed control group allowing the rotor to rotate at the desired speed.
Le rotor comporte un grand nombre de pales verticales 14 régulièrement espacées sur sa périphérie et dont les extrémités inférieures et supérieures sont fixées, respectivement, sur un fond 16 et sur un anneau 18. Une virole cylindrique 20 fixée sur le bord intérieur de l'anneau 18 définit un passage de sortie pour l'air chargé des particules de petites dimensions qui ont pénétré dans le rotor par les canaux 15 ménagés entre les pales 14. Cette virole se raccorde, par un joint tournant, à l'extrémité inférieure d'un conduit d'évacuation 22 traversant le plafond de l'enveloppe du séparateur.The rotor has a large number of vertical blades 14 regularly spaced around its periphery and whose lower and upper ends are fixed, respectively, on a bottom 16 and on a ring 18. A cylindrical ferrule 20 fixed on the inner edge of the ring 18 defines an outlet passage for the air charged with particles of small dimensions which have entered the rotor through the channels 15 formed between the blades 14. This ferrule is connected, by a rotating joint, to the lower end of a discharge duct 22 passing through the ceiling of the separator casing.
L'intérieur du rotor est divisé en quatre secteurs égaux par quatre cloisons verticales 24 disposées radialement. Ces cloisons sont fixées sur le fond 16, sur l'anneau 18 et sur une virole 26 entourant la partie inférieure du support tubulaire 12 et elle-même fixée sur le fond 16.The interior of the rotor is divided into four equal sectors by four vertical partitions 24 arranged radially. These partitions are fixed on the bottom 16, on the ring 18 and on a ferrule 26 surrounding the lower part of the tubular support 12 and itself fixed on the bottom 16.
L'ouverture de sortie délimitée par l'anneau 18 et la virole 26 est partiellement obturée par des volets pivotants 28 (deux par secteur dans la forme de réalisation représentée). Chaque volet est fixé sur un arbre 30 monté sur des paliers fixés sur l'anneau 18 et la virole 26. Un carré prévu à l'extrémité extérieure de chaque arbre 30 permet de régler l'orientation des volets et, par conséquent, la section de l'ouverture de sortie des secteurs respectifs, et un système de verrouillage permet de maintenir les volets dans la position voulue, après réglage.The outlet opening delimited by the ring 18 and the ferrule 26 is partially closed by pivoting flaps 28 (two by sector in the embodiment shown). Each flap is fixed on a shaft 30 mounted on bearings fixed on the ring 18 and the ferrule 26. A square provided at the outer end of each shaft 30 makes it possible to adjust the orientation of the flaps and, consequently, the section of the exit opening of the respective sectors, and a locking system keeps the shutters in the desired position, after adjustment.
Dans le secteur du rotor représenté sur la partie gauche inférieure de la figure 2, une pale 14 sur deux est formée d'une partie fixe 31 constituant la face active et une partie mobile 32 orientable autour d'un axe vertical 33 situé près du bord d'attaque de la pale (voir figure 3). Cette partie 32 est déplaçable, entre une première position (représentée par un trait continu sur la figure 3) où elle est plaquée contre la partie fixe 31 de la pale, de façon à laisser libre l'entrée du canal 15, et une seconde position (représentée en traits mixtes) où elle obture complètement cette entrée. L'orientation des parties mobiles des pales pourra être commandée individuellement ou par groupes. Ces pales en deux parties devront être réparties sur la périphérie du rotor de telle sorte que celui-ci soit équilibré. On pourra, par exemple, en équiper deux secteurs du rotor diamétralement opposés. La figure 4 montre une autre forme de réalisation des moyens d'obturation de certains canaux 15 du rotor. Selon cette variante les deux pales délimitant un canal sont en deux parties : une partie extérieure 31' qui est fixée rigidement à la structure du rotor et une partie inférieure 32' qui est apte à pivoter autour d'un axe vertical 33'. Un mécanisme de commande, non représenté permet de déplacer la partie mobile 32' de chaque pale entre deux positions : une première position, représentée en trait continu sur la figure 4, où les parties 31' et 32' sont dans le prolongement l'une de l'autre et le canal 15 est complètement dégagé, et une seconde position, représentée en trait mixte, où les extrémités libres des parties 32' des deux pales sont en butée l'une contre l'autre et le canal 15 est obturé.In the sector of the rotor represented on the lower left part of FIG. 2, one blade 14 out of two is formed by a fixed part 31 constituting the active face and a movable part 32 orientable around a vertical axis 33 located near the edge blade attack (see Figure 3). This part 32 is movable, between a first position (represented by a solid line in FIG. 3) where it is pressed against the fixed part 31 of the blade, so as to leave free the entry of the channel 15, and a second position (shown in dashed lines) where it closes completely this entry. The orientation of the moving parts of the blades can be controlled individually or in groups. These two-part blades must be distributed over the periphery of the rotor so that it is balanced. We could, for example, equip two diametrically opposite sectors of the rotor. FIG. 4 shows another embodiment of the means for closing off certain channels 15 of the rotor. According to this variant, the two blades delimiting a channel are in two parts: an external part 31 'which is rigidly fixed to the structure of the rotor and a lower part 32' which is able to pivot around a vertical axis 33 '. A control mechanism, not shown makes it possible to move the movable part 32 'of each blade between two positions: a first position, shown in solid lines in FIG. 4, where the parts 31' and 32 'are in line with one on the other and the channel 15 is completely cleared, and a second position, shown in phantom, where the free ends of the parts 32 ′ of the two blades are in abutment against one another and the channel 15 is closed.
Dans la variante de la figure 5, les moyens d'obturation des canaux sont constitués par des paires de plaques verticales 40 placées à l'intérieur du rotor, les deux plaques d'une paire étant articulées par leur bord intérieur sur un même axe vertical 42 disposé dans le plan médian du canal. Une came 44 placée entre les deux plaques et commandée par un mécanisme approprié permet d'écarter les deux plaques pour amener leur extrémité libre en butée contre les pales 14 et obturer la sortie du canal 15, comme représenté en trait continu sur la figure. Lorsqu'on fait tourner la came pour l'amener dans le plan médian du canal, les plaques 40 sont plaquées contre la came par la force centrifuge, comme représenté en traits mixtes sur la figure, et la sortie du canal 15 est presque complètement dégagée.In the variant of FIG. 5, the means for closing the channels consist of pairs of vertical plates 40 placed inside the rotor, the two plates of a pair being articulated by their inner edge on the same vertical axis. 42 disposed in the median plane of the channel. A cam 44 placed between the two plates and controlled by an appropriate mechanism makes it possible to separate the two plates to bring their free end into abutment against the blades 14 and close the outlet of the channel 15, as shown in solid line in the figure. When the cam is rotated to bring it into the median plane of the channel, the plates 40 are pressed against the cam by centrifugal force, as shown in phantom in the figure, and the outlet of the channel 15 is almost completely clear .
Selon une autre variante, non représentée, certaines pales 14 pourraient être orientables en étant montées de façon à pouvoir pivoter sur le rotor autour d'axes verticaux situés près de leur bord d'attaque et venir buter contre les pales voisines fixes ou orientables pour obturer les canaux 15 correspondants.According to another variant, not shown, certain blades 14 could be orientable by being mounted so as to be able to pivot on the rotor around vertical axes located near their leading edge and to abut against the adjacent fixed or orientable blades to close off the corresponding channels 15.
En service, le séparateur est incorporé à un circuit, ouvert ou fermé, où circule un courant de gaz, par exemple un courant d'air. En pénétrant dans le rotor le courant d'air se divise en autant de courants élémentaires qu'il y a de canaux 15 entre les pales 14. A la sortie des canaux ces courants élémentaires se regroupent dans chaque secteur du rotor en quatre courants secondaires qui s'échappent à travers l'ouverture de sortie délimitée par l'anneau 18 et la virole 26. Si tous les volets 28 sont en position verticale et si tous les canaux 15 sont ouverts, les débits des quatre courants secondaires sont égaux et les vitesses des courants élémentaires sont égales ; le fonctionnement du séparateur est le même que celui d'un séparateur classique.In service, the separator is incorporated in a circuit, open or closed, where a gas flow, for example an air flow, circulates. Upon entering the rotor, the air stream is divided into as many elementary streams as there are channels 15 between the blades 14. At the outlet of the channels, these elementary streams are grouped in each sector of the rotor into four secondary streams which escape through the outlet opening delimited by the ring 18 and the ferrule 26. If all the flaps 28 are in the vertical position and if all the channels 15 are open, the flow rates of the four secondary currents are equal and the speeds elementary currents are equal; the operation of the separator is the same as that of a classic separator.
Si l'on obture une partie des canaux 15 dans l'un des secteurs du rotor et simultanément on ferme partiellement les volets 28 dans les autres secteurs, pour que le courant d'air se divise en deux courants différents tels que le débit traversant chacun des secteurs dont les volets 28 sont fermés soit inférieur au débit traversant le secteur dont les volets sont ouverts, la vitesse de l'air dans les canaux 15 restés ouverts du premier secteur sera, pour ces deux raisons, plus élevée que dans les canaux des autres secteurs. Etant donné que les forces de traînée qui s'exercent sur les particules et s'opposent à la force centrifuge dans les canaux 15 dépendent de la vitesse de l'air, alors que les forces centrifuges ne dépendent que de la vitesse de rotation du rotor, la dimension des particules pour laquelle les forces centrifuge et de traînée sont équilibrées (maille théorique de coupure) sera plus importante dans le premier secteur que dans les autres. Tout se passe donc comme si on avait deux séparateurs en parallèle travaillant avec des mailles de coupure différentes et dont les fractions fines seraient mélangées à la sortie du séparateur. En ajustant la section d'entrée de l'air dans un ou plusieurs secteurs du rotor et en réglant les débits d'air circulant dans les différents secteurs, on peut sélectionner deux mailles de coupure différentes, ou plus, permettant d'obtenir la distribution granulométrique voulue dans une plage donnée.If a part of the channels 15 is closed in one of the sectors of the rotor and simultaneously the flaps 28 are partially closed in the other sectors, so that the air stream is divided into two different streams such as the flow through each sectors whose flaps 28 are closed is lower than the flow through the sector whose flaps are open, the air speed in the channels 15 remained open in the first sector will be, for these two reasons, higher than in the channels of other sectors. Since the drag forces exerted on the particles and opposed to the centrifugal force in the channels 15 depend on the speed of the air, while the centrifugal forces only depend on the speed of rotation of the rotor , the particle size for which the centrifugal and drag forces are balanced (theoretical cutoff mesh) will be larger in the first sector than in the others. Everything therefore happens as if we had two separators in parallel working with different cut-off meshes and whose fine fractions would be mixed at the exit of the separator. By adjusting the air inlet section in one or more sectors of the rotor and by adjusting the air flow rates circulating in the different sectors, it is possible to select two or more different cutoff meshes, making it possible to obtain the distribution desired size within a given range.
La figure 7 montre à titre d'exemple les courbes de partage d'un séparateur classique, pour deux mailles de coupure, et d'un séparateur conforme à l'invention. La courbe de partage donne la proportion pondérale, exprimée en %, des particules de taille donnée dans la fraction grossière ; on obtiendrait une courbe inversée pour la fraction fine. Pour des dimensions de particules inférieures à 20 μm et supérieures à 200 μm, les trois courbes sont confondues. Dans la plage 20-200 μm, la courbe en tirets correspond à un séparateur classique dont la maille de coupure théorique est de 50 μm, celle en pointillés correspond à un séparateur classique dont la maille de coupure théorique est de 105 μm. La courbe en trait continu a été obtenue avec le séparateur de l'invention ; on voit que sa pente est plus faible que celle des séparateurs classiques, ce qui signifie que dans la plage 20-200 μm, la granulométrie est plus étalée.FIG. 7 shows by way of example the partition curves of a conventional separator, for two cut-off meshes, and of a separator according to the invention. The partition curve gives the weight proportion, expressed in%, of the particles of given size in the coarse fraction; we would get an inverted curve for the fine fraction. For particle sizes less than 20 μm and greater than 200 μm, the three curves are combined. In the range 20-200 μm, the dashed curve corresponds to a conventional separator whose theoretical cutoff mesh is 50 μm, that in dotted lines corresponds to a conventional separator whose theoretical cutoff mesh is 105 μm. The curve in solid line was obtained with the separator of the invention; it can be seen that its slope is lower than that of conventional separators, which means that in the range 20-200 μm, the particle size is more spread out.
L'invention permet donc d'avoir une courbe de partage à pente réglable et, par conséquent, d'obtenir un produit fini ayant la distribution granulométrique voulue dans une plage granulométrique donnée en jouant à la fois sur la vitesse du rotor et l'orientation des aubes directrices, d'une part, et les positions des volets 28 et le réglage de la section des canaux 15, d'autre part. Au lieu d'être divisé en secteurs par des cloisons radiales, le rotor pourrait être conçu comme montré sur la figure 6 et divisé en deux parties 46, 48, par une cloison horizontale 50, située par exemple à mi-hauteur, une ouverture 52 prévue dans la paroi supérieure du rotor faisant communiquer la partie supérieure du rotor avec le conduit d'évacuation d'air 22 du séparateur et une virole 54 dont le diamètre est inférieur à celui de ladite ouverture 52 étant raccordée à une ouverture centrale 56 de la cloison et délimitant un passage 55 faisant communiquer la partie inférieure du rotor avec le conduit d'évacuation 22 à travers la première ouverture. Le rotor est muni de moyens tels que ceux illustrés par les figures 3, 4 et 5 pour obturer certains des canaux ménagés entre ses pales, sur au moins une partie de leur hauteur, et de moyens tels que les volets 28 pour régler au moins une des ouvertures de sortie. Suivant le même principe, le rotor pourrait être divisé en plus de deux parties superposées. On pourrait même supprimer la ou les cloisons horizontales, la division de l'air en deux ou plusieurs courants dans le rotor résultant de la disposition d'un ou plusieurs tubes plongeurs placés dans l'axe du rotor. Des moyens autres que des volets pivotants, par exemple des diaphragmes, pourraient être utilisés pour régler la section des ouvertures de sortie du rotor. Il est bien entendu que ces modifications et toutes celles qui peuvent être apportées aux formes de réalisation décrites, par l'emploi de moyens techniques équivalents, entrent dans le cadre de l'invention. The invention therefore makes it possible to have a partition curve with adjustable slope and, consequently, to obtain a finished product having the desired particle size distribution in a given particle size range by varying both the speed of the rotor and the orientation. guide vanes, on the one hand, and the positions of the flaps 28 and the adjustment of the section of the channels 15, on the other hand. Instead of being divided into sectors by radial partitions, the rotor could be designed as shown in FIG. 6 and divided into two parts 46, 48, by a horizontal partition 50, situated for example at mid-height, an opening 52 provided in the upper wall of the rotor communicating the upper part of the rotor with the air exhaust duct 22 of the separator and a ferrule 54 whose diameter is less than that of said opening 52 being connected to a central opening 56 of the partition and delimiting a passage 55 communicating the lower part of the rotor with the discharge duct 22 through the first opening. The rotor is provided with means such as those illustrated in FIGS. 3, 4 and 5 for closing off some of the channels formed between its blades, over at least part of their height, and with means such as flaps 28 for adjusting at least one outlet openings. Following the same principle, the rotor could be divided into more than two superimposed parts. One could even eliminate the horizontal partition (s), the division of air into two or more currents in the rotor resulting from the arrangement of one or more dip tubes placed in the axis of the rotor. Means other than pivoting flaps, for example diaphragms, could be used to adjust the section of the outlet openings of the rotor. It is understood that these modifications and all those which can be made to the embodiments described, by the use of equivalent technical means, come within the scope of the invention.

Claims

REVENDICATIONS
1. Séparateur à air à action centrifuge comportant un rotor à axe vertical muni de pales régulièrement réparties sur sa périphérie, des aubes directrices disposées autour du rotor et une enveloppe contenant le rotor et les aubes directrices et munie d'entrées pour l'air et pour le matériau à classer, d'un conduit d'évacuation pour l'air chargé de la fraction fine du matériau et d'une sortie pour la fraction grossière, l'air pénétrant dans le rotor à sa périphérie, par les canaux formés entre les pales, et circulant à l'intérieur du rotor vers le conduit d'évacuation, caractérisé en ce que l'air circulant dans le rotor est divisé en au moins deux courants distincts, et le rotor est équipé de moyens de réglage de la vitesse et/ou du débit d'au moins un des courants. 1. Air separator with centrifugal action comprising a rotor with vertical axis provided with blades regularly distributed on its periphery, guide vanes arranged around the rotor and an envelope containing the rotor and the guide vanes and provided with inlets for air and for the material to be classified, an evacuation duct for the air charged with the fine fraction of the material and an outlet for the coarse fraction, the air entering the rotor at its periphery, through the channels formed between the blades, and circulating inside the rotor towards the exhaust duct, characterized in that the air circulating in the rotor is divided into at least two separate streams, and the rotor is equipped with means for adjusting the speed and / or the flow rate of at least one of the currents.
2. Séparateur selon la revendication 1, caractérisé en ce que ledit rotor est équipé de moyens (32, 32', 40) pour faire varier la section d'au moins certains des canaux (15) par lesquels l'un des courants d'air pénètre à l'intérieur du rotor.2. Separator according to claim 1, characterized in that said rotor is equipped with means (32, 32 ', 40) for varying the section of at least some of the channels (15) through which one of the currents of air enters inside the rotor.
3. Séparateur selon la revendication 1 ou 2, caractérisé en ce que ledit rotor est équipé de moyens (28) pour faire varier la section de l'ouverture par laquelle au moins l'un des courants d'air s'échappe du rotor vers le conduit d'évacuation (28).3. Separator according to claim 1 or 2, characterized in that said rotor is equipped with means (28) for varying the section of the opening through which at least one of the air currents escapes from the rotor towards the exhaust duct (28).
4. Séparateur selon la revendication 1, 2 ou 3, caractérisé en ce que le rotor est divisé en secteurs par des cloisons verticales (24) disposées radialement et chaque secteur communique avec le passage de sortie par une ouverture munie de moyens de réglage (28) de la section de passage de l'air. 4. Separator according to claim 1, 2 or 3, characterized in that the rotor is divided into sectors by vertical partitions (24) arranged radially and each sector communicates with the outlet passage through an opening provided with adjustment means (28 ) of the air passage section.
5. Séparateur selon la revendication 1, 2 ou 3, caractérisé en ce que le rotor est divisé en deux parties (46, 48) par une cloison horizontale (50), en ce que la partie (48) du rotor la plus éloignée du conduit d'évacuation (22) communique avec ce dernier par un passage (55) délimité par une virole coaxiale (54) raccordée à une ouverture centrale (56) de ladite cloison, en ce que l'autre partie (46) du rotor communique avec ledit conduit d'évacuation par une ouverture annulaire (52) entourant ladite virole, et en ce que des moyens sont prévus pour faire varier la section d'au moins certains des canaux ménagés entre les pales (14) dans au moins une des parties du rotor et pour faire varier la section dudit passage (55) et/ou de ladite ouverture annulaire (52).5. Separator according to claim 1, 2 or 3, characterized in that the rotor is divided into two parts (46, 48) by a horizontal partition (50), in that the part (48) of the rotor furthest from the evacuation duct (22) communicates with the latter by a passage (55) delimited by a coaxial ferrule (54) connected to a central opening (56) of said partition, in that the other part (46) of the rotor communicates with said discharge conduit through an annular opening (52) surrounding said ferrule, and in that means are provided for varying the section of at least some of the channels formed between the blades (14) in at least one of the parts of the rotor and for varying the section of said passage (55) and / or of said annular opening (52).
6. Séparateur selon la revendication 4 ou 5, caractérisé en ce que lesdits moyens de réglage de la section de ladite ouverture et/ou dudit passage, sont constitués par des volets pivotants (28). 6. Separator according to claim 4 or 5, characterized in that said means for adjusting the section of said opening and / or said passage, are constituted by pivoting flaps (28).
7. Séparateur selon la revendication 4 ou 5, caractérisé en ce que lesdits moyens de réglage de la section de ladite ouverture et/ou dudit passage sont constitués par des diaphragmes.7. Separator according to claim 4 or 5, characterized in that said means for adjusting the section of said opening and / or said passage are constituted by diaphragms.
8. Séparateur selon la revendication 4 ou 5, caractérisé en ce que le rotor est équipé de moyens (32, 32', 40) pour faire varier la section d'au moins certains des canaux (15) formés entre les pales (14) de l'un des secteurs ou parties du rotor.8. Separator according to claim 4 or 5, characterized in that the rotor is equipped with means (32, 32 ', 40) for varying the section of at least some of the channels (15) formed between the blades (14) of one of the sectors or parts of the rotor.
9. Séparateur selon la revendication 2 ou 8, caractérisé en ce que lesdits moyens pour faire varier la section des canaux sont constitués par des plaques disposées dans lesdits canaux (15), chaque plaque étant mobile entre une première position où elle laisse libre pratiquement toute la section du canal et une seconde position où elle obture pratiquement complètement le canal.9. Separator according to claim 2 or 8, characterized in that said means for varying the section of the channels are constituted by plates arranged in said channels (15), each plate being movable between a first position where it leaves free almost any the section of the channel and a second position where it almost completely closes the channel.
10. Séparateur selon la revendication 2 ou 8, caractérisé en ce que lesdits moyens pour faire varier la section des canaux sont constitués, pour chaque canal, par deux plaques (40) placées à la sortie du canal (15) et montées pivotantes sur un axe vertical (42) disposé dans le plan médian du canal, ces plaques pouvant être amenées par un mécanisme approprié (44) d'une première position où elles sont plaquées l'une contre l'autre et disposées pratiquement parallèlement audit plan médian, dans une seconde position où leurs extrémités libres sont en butée contre l'extrémité des pales (14) délimitant le canal.10. Separator according to claim 2 or 8, characterized in that said means for varying the section of the channels consist, for each channel, by two plates (40) placed at the outlet of the channel (15) and pivotally mounted on a vertical axis (42) disposed in the median plane of the channel, these plates being able to be brought by an appropriate mechanism (44) from a first position where they are pressed against one another and arranged practically parallel to said median plane, in a second position where their free ends are in abutment against the end of the blades (14) delimiting the channel.
11. Séparateur selon la revendication 2 ou 8, caractérisé en ce que certaines pales (14) du rotor sont orientables autour d'axes verticaux de façon qu'elles puissent venir s'appuyer sur une pale voisine pour obturer les canaux (15) qu'elles forment avec les pales voisines, ces pales orientables constituant les moyens pour faire varier la section desdits canaux.11. Separator according to claim 2 or 8, characterized in that certain blades (14) of the rotor are orientable around vertical axes so that they can come to bear on a neighboring blade to close the channels (15) that 'They form with the neighboring blades, these adjustable blades constituting the means for varying the section of said channels.
12. Séparateur selon la revendication 2 ou 8, caractérisé en ce que certaines pales (14) du rotor sont en deux parties, une partie fixe (31, 31') et une partie mobile (32, 32') orientable par rotation autour d'un axe vertical et ces parties mobiles des pales constituent les moyens pour faire varier la section des canaux (15).12. Separator according to claim 2 or 8, characterized in that certain blades (14) of the rotor are in two parts, a fixed part (31, 31 ') and a mobile part (32, 32') orientable by rotation around 'a vertical axis and these moving parts of the blades constitute the means for varying the section of the channels (15).
13. Séparateur selon la revendication 12, caractérisé en ce que l'une des faces (31) de certaines pales est fixe et l'autre face (32) est mobile et apte à pivoter autour d'un axe vertical (33) situé près de la périphérie du rotor pour venir s'appuyer sur la pale voisine et obturer le canal ( 15) qu'elles forment.13. Separator according to claim 12, characterized in that one of the faces (31) of certain blades is fixed and the other face (32) is movable and able to pivot around a vertical axis (33) located near from the periphery of the rotor to come to bear on the neighboring blade and close off the channel (15) which they form.
14. Séparateur selon la revendication 12, caractérisé en ce que la partie radialement extérieure (31') de la pale est fixe et sa partie radialement intérieure (32') est rotative, les parties mobiles de deux pales voisines pouvant être amenées en butée l'une contre l'autre pour obturer le canal délimité par les deux pales. 14. Separator according to claim 12, characterized in that the radially outer part (31 ') of the blade is fixed and its radially inner part (32') is rotatable, the movable parts of two adjacent blades being able to be brought into abutment l 'one against the other to close the channel delimited by the two blades.
EP97918235A 1995-11-21 1997-04-15 Air classifier with centrifugal action Expired - Lifetime EP0918573B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DK97918235T DK0918573T3 (en) 1995-11-21 1997-04-15 Windscreen with centrifugal action

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9513764A FR2741286B1 (en) 1995-11-21 1995-11-21 AIR SEPARATOR WITH CENTRIFUGAL ACTION
PCT/FR1997/000678 WO1998046371A1 (en) 1995-11-21 1997-04-15 Air classifier with centrifugal action

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EP0918573A1 true EP0918573A1 (en) 1999-06-02
EP0918573B1 EP0918573B1 (en) 2004-06-30

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EP (1) EP0918573B1 (en)
JP (1) JP3999278B2 (en)
AT (1) ATE270159T1 (en)
AU (1) AU741249B2 (en)
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DE69729731T2 (en) 2005-08-04
CZ292237B6 (en) 2003-08-13
CZ392498A3 (en) 1999-04-14
US6318559B2 (en) 2001-11-20
AU2643597A (en) 1998-11-11
US6273269B1 (en) 2001-08-14
JP3999278B2 (en) 2007-10-31
ES2224236T3 (en) 2005-03-01
DE69729731D1 (en) 2004-08-05
UA63905C2 (en) 2004-02-16
WO1998046371A1 (en) 1998-10-22
FR2741286A1 (en) 1997-05-23
AU741249B2 (en) 2001-11-29
PL330322A1 (en) 1999-05-10
FR2741286B1 (en) 1998-01-23
CA2257674C (en) 2003-01-07
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US20010020597A1 (en) 2001-09-13
EP0918573B1 (en) 2004-06-30

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