FR2679789A1 - Pulsation disperser-mixer for the preparation of thermoplastic products, in particular bituminous products - Google Patents

Pulsation disperser-mixer for the preparation of thermoplastic products, in particular bituminous products Download PDF

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Publication number
FR2679789A1
FR2679789A1 FR9109734A FR9109734A FR2679789A1 FR 2679789 A1 FR2679789 A1 FR 2679789A1 FR 9109734 A FR9109734 A FR 9109734A FR 9109734 A FR9109734 A FR 9109734A FR 2679789 A1 FR2679789 A1 FR 2679789A1
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France
Prior art keywords
radial
channels
rotor
radial slots
stator
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
FR9109734A
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French (fr)
Inventor
Gauthier Henri-Pierre
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OUEST ENROBES MODERNES
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OUEST ENROBES MODERNES
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Priority to FR9109734A priority Critical patent/FR2679789A1/en
Publication of FR2679789A1 publication Critical patent/FR2679789A1/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
    • B01F27/81—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis the stirrers having central axial inflow and substantially radial outflow
    • B01F27/812—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis the stirrers having central axial inflow and substantially radial outflow the stirrers co-operating with surrounding stators, or with intermeshing stators, e.g. comprising slits, orifices or screens

Abstract

Disperser-mixer device for the preparation of an intimate mixture of immiscible materials of fine particle size. The device according to the invention includes a rotor with vanes (2) which pivots in a cylindrical stator of revolution (1) provided with radial slots or channels (8), the front face (4), in the direction of rotation (5) of the rotor, of the said vanes (2) being of a concave shape such as to produce a radial acceleration of the particles towards the periphery, the outer faces (3) of the said vanes (2) having a substantially cylindrical section of revolution travelling in the immediate vicinity of the inner face of the said stator (1), the length of the said outer faces (3) corresponding to a pitch of the radial slots or channels (8), or to a multiple of this pitch, the said radial slots or channels (8) have a short forward frontal wall (9), in the direction of rotation (5) of the rotor, which is substantially radial, and a rear wall (11) which is longer and also substantially radial. Application to the manufacture of bitumens.

Description

Mélanveur-disperseur à Pulsations Pour la Préparation de produits thermoPlastiques, en particulier de produits bitumineux. Pulse mixer-disperser For the preparation of thermoplastic products, in particular bituminous products.

L'invention concerne la préparation de produits thermoplastiques, en particulier mais non exclusivement des produits bitumineux tels que ceux utilisés pour la construction des routes.The invention relates to the preparation of thermoplastic products, in particular but not exclusively bituminous products such as those used for road construction.

Le mélange intime de matières non miscibles en particules de très petites dimensions est un problème posé depuis longtemps à l'industrie. C'est en particulier le cas des bitumes à usage routier qui, selon un développement moderne, contiennent, en plus du bitume ou autre produits bitumineux, des additifs tels que des polymères plastiques, qui doivent subir un mélange intime à des températures relativement élevées allant jusqu'à 2000C et au-delâ. The intimate mixing of immiscible materials into very small particles has been a problem for a long time in the industry. This is in particular the case of bitumens for road use which, according to modern development, contain, in addition to bitumen or other bituminous products, additives such as plastic polymers, which must undergo intimate mixing at relatively high temperatures ranging up to 2000C and beyond.

Il est connu d'utiliser des mélangeurs constitués d'un rotor et d'un stator munis de fentes formant des chambres de mélange (FR-A-2.611.352), éventuellement complétés par des nervures de cisaillement séparées par des bagues d'espacement (FR-A-2.287.830). Ces dispositifs connus, essentiellement prévus pour des matières plastiques à grande viscosité, ne permettent pas d'obtenir un mélange suffisamment intime lorsque les particules sont extrêmement fines (quelques dizaines de micromètres).It is known to use mixers consisting of a rotor and a stator provided with slots forming mixing chambers (FR-A-2,611,352), possibly supplemented by shear ribs separated by spacing rings (FR-A-2.287.830). These known devices, essentially intended for plastics with high viscosity, do not allow a sufficiently intimate mixture to be obtained when the particles are extremely fine (a few tens of micrometers).

On a également proposé (EP-A-192.300) de mélanger des produits bitumineux au moyen d'un dispositif constitué de deux cylindres coaxiaux chauffés ayant un faible écartement, avec des moyens pour transporter le mélange. Ce dispositif ne permet pas non plus d'assurer un mélange homogène de particules très fines.It has also been proposed (EP-A-192,300) to mix bituminous products by means of a device consisting of two heated coaxial cylinders having a small spacing, with means for transporting the mixture. This device also does not ensure a homogeneous mixture of very fine particles.

On connaît encore des dispositifs assurant simultanément un mélange et un broyage au moyen d'un système rotor-stator avec une succession radiale d'ailettes séparant le fluide en une pluralité de courants individuels (EP-A-135.697). Ce dispositif, qui peut être utilisé aussi bien pour des matières plastiques, des polymères pour la modification de bitumes que pour des déchets d'abattoir, ne peut assurer le mélange homogène de particules fines recherché. L'action de mélange est médiocre et l'énergie consommée est élevée.Devices are also known which simultaneously ensure mixing and grinding by means of a rotor-stator system with a radial succession of fins separating the fluid into a plurality of individual streams (EP-A-135,697). This device, which can be used both for plastics, polymers for the modification of bitumens and for slaughterhouse waste, cannot ensure the homogeneous mixture of fine particles sought. The mixing action is poor and the energy consumed is high.

On a également décrit (DD-C-232.838) un dispositif de mélange et de malaxage de produits bitumineux avec des additifs solides qui comprend une pluralité d'éléments mélangeurs et homogénéisateurs disposés sur un axe pivotant à l'intérieur d'un carter chauffé. Ces éléments produisent sur le fluide à mélanger, qui se déplace sous pression parallèlement à l'axe, une multitude de déplacements élémentaires forcés dus à la force centrifuge, à la pression et aux chocs sur les éléments en forme de couteaux. Ce dispositif connu est d'une grande complexité de fabrication et de montage, a donc un coût élevé; en outre, son nettoyage est problématique et son efficacité n'a pas été démontrée.There has also been described (DD-C-232.838) a device for mixing and kneading bituminous products with solid additives which comprises a plurality of mixing and homogenizing elements arranged on a pivoting axis inside a heated casing. These elements produce a multitude of elementary forced displacements on the fluid to be mixed, which moves under pressure parallel to the axis, due to centrifugal force, pressure and impacts on the knife-shaped elements. This known device is very complex to manufacture and assemble, and therefore has a high cost; furthermore, cleaning is problematic and its effectiveness has not been demonstrated.

On connaît par ailleurs des machines du type moulin colloïdal servant à fabriquer par broyage des émulsions, à partir de solutions aqueuses par exemple. Ces machines connues ne permettent pas de résoudre le problème posé selon la présente invention.Furthermore, machines of the colloid mill type are known which are used to manufacture by grinding emulsions, for example from aqueous solutions. These known machines do not make it possible to solve the problem posed according to the present invention.

La présente invention vise en conséquence à fournir un nouveau dispositif pour le mélange et la dispersion de matières non miscibles telles que des produits thermoplastiques bitumineux contenant des additifs, par exemple des polymères, qui permette, avec une structure simple et économique, d'obtenir un mélange très homogène même avec des particules très fines d'une granulométrie de l'ordre de quelques dizaines de micromètres.The present invention therefore aims to provide a new device for mixing and dispersing immiscible materials such as bituminous thermoplastic products containing additives, for example polymers, which allows, with a simple and economical structure, to obtain a very homogeneous mixture even with very fine particles with a particle size of the order of a few tens of micrometers.

A cet effet, le dispositif selon l'invention est caractérisé en ce qu'il comprend un rotor à aubes pivotant dans un stator cylindrique de révolution muni de fentes radiales ou canaux, la face antérieure, dans le sens de rotation du rotor, desdites aubes ayant une forme concave agencée pour produire une accélération radiale des particules vers la périphérie, les faces externes desdites aubes ayant une section sensiblement cylindrique de révolution se déplaçant au voisinage immédiat de la face interne dudit stator, la longueur desdites faces externes correspondant à un pas des fentes radiales ou canaux, ou à un multiple de ce pas, lesdites fentes radiales ou canaux présentant une courte paroi frontale antérieure, dans le sens de rotation du rotor, sensiblement radiale et une paroi postérieure plus longue et également sensiblement radiale.To this end, the device according to the invention is characterized in that it comprises a rotor with blades pivoting in a cylindrical stator of revolution provided with radial slots or channels, the front face, in the direction of rotation of the rotor, of said blades having a concave shape arranged to produce a radial acceleration of the particles towards the periphery, the external faces of said blades having a substantially cylindrical section of revolution moving in the immediate vicinity of the internal face of said stator, the length of said external faces corresponding to a pitch of the radial slots or channels, or a multiple thereof, said radial slots or channels having a short anterior front wall, in the direction of rotation of the rotor, substantially radial and a longer rear wall and also substantially radial.

Le dispositif selon 1 invention assure une accélération centrifuge très élevée aux matières prémélangées et amenées sous faible pression, par les aubes du rotor dessinées à cet effet, alors que le choc de ces matières contre les petites parois frontales des canaux produit un déplacement circulaire des particules, les portions avant et arrière de chaque aube agissant en outre comme des tiroirs rotatifs sur les canaux respectifs en cours d'ouverture (a l'arrière) et de fermeture (à l'avant).The device according to 1 invention provides a very high centrifugal acceleration to the premixed materials and brought under low pressure, by the blades of the rotor designed for this purpose, while the impact of these materials against the small front walls of the channels produces a circular displacement of the particles. , the front and rear portions of each blade further acting as rotary drawers on the respective channels being opened (at the back) and closed (at the front).

L'invention sera bien comprise à la lecture de la description suivante faite en référence au dessin annexé dont la figure unique est une vue schématique en coupe diamétrale d'un dispositif selon un exemple de réalisation de l'invention.The invention will be clearly understood on reading the following description made with reference to the accompanying drawing, the single figure of which is a schematic view in diametral section of a device according to an exemplary embodiment of the invention.

Le dispositif comprend un stator cylindrique de révolution 1 dans lequel tourillonne à grande vitesse un rotor creux constitué, dans l'exemple représenté, de quatre aubes 2 identiques disposées dans une couronne cylindrique du rotor.The device comprises a cylindrical stator of revolution 1 in which spins at high speed a hollow rotor made up, in the example shown, of four identical vanes 2 arranged in a cylindrical ring of the rotor.

Les aubes 2 ont une surface périphérique externe 3 en forme de secteur cylindrique de révolution, coaxiale au stator 1 et disposée extrêmement près de la surface interne du stator 1.The blades 2 have an external peripheral surface 3 in the form of a cylindrical sector of revolution, coaxial with the stator 1 and disposed extremely close to the internal surface of the stator 1.

La face avant 4 (dans le sens de rotation 5 du rotor 4) de chaque aube 2 a une surface concave terminée par une portion terminale périphérique 6 sensiblement plane et radiale. La face arrière 7 des aubes 2 est plane.The front face 4 (in the direction of rotation 5 of the rotor 4) of each blade 2 has a concave surface terminated by a peripheral terminal portion 6 substantially planar and radial. The rear face 7 of the vanes 2 is flat.

Le stator 1 comporte une pluralité de fentes radiales ou canaux 8 régulièrement réparties dont la face avant (dans le sens de la flèche 5) comporte une portion plane 9 sensiblement radiale de faible largeur prolongée par une face plane 10 inclinée vers l'avant. La face arrière 11 de chaque canal 8 est plane et sensiblement radiale.The stator 1 comprises a plurality of regularly distributed radial slots or channels 8, the front face (in the direction of the arrow 5) comprises a planar portion 9 substantially radial of small width extended by a planar face 10 inclined towards the front. The rear face 11 of each channel 8 is flat and substantially radial.

La longueur de la surface périphérique 3 des aubes 2 est, dans l'exemple représenté, égale à deux pas des canaux 8, c'est-àdire qu une aube 2 ferme toujours complètement un canal 8 et partiellement les canaux 8 adjacents, ou ferme complètement deux canaux 8 adjacents.The length of the peripheral surface 3 of the blades 2 is, in the example shown, equal to two steps of the channels 8, that is to say that a blade 2 always completely closes a channel 8 and partially the adjacent channels 8, or closes completely two adjacent channels 8.

Le fonctionnement du dispositif qui vient d'être décrit est le suivant
Les matières à mélanger de manière intime sont amenées sous faible pression, en étant prémélangées, depuis une chambre axiale (non représentée) dans le mélangeur. Les matières saisies par les aubes 3 sont projetées vers l'extérieur entre deux aubes 3 successives. Du fait de la force centrifuge, elles tendent à s'accumuler sur la face frontale 4 de l'aube 3 correspondante, dont la forme concave les projette à grande vitesse sur le stator 1.Les matières projetées radialement par la portion plane 6 de l'aube rencontrent la portion plane radiale 9 de faible largeur du bord du canal 7 adjacent à la face 4, qui leur donne, en tenant compte de la vitesse élevée du rotor, un mouvement circulaire ou tourbillonnaire qui assure un mélange intime et homogène des matières, lequel mélange est recueilli à la périphérie du stator 1.The operation of the device which has just been described is as follows
The materials to be intimately mixed are brought under low pressure, by being premixed, from an axial chamber (not shown) in the mixer. The materials gripped by the blades 3 are projected outwardly between two successive blades 3. Due to the centrifugal force, they tend to accumulate on the front face 4 of the corresponding blade 3, whose concave shape projects them at high speed onto the stator 1. The materials projected radially by the flat portion 6 of the 'dawn meet the radial flat portion 9 of small width of the edge of the channel 7 adjacent to the face 4, which gives them, taking into account the high speed of the rotor, a circular or vortex movement which ensures an intimate and homogeneous mixture of materials , which mixture is collected at the periphery of stator 1.

Le dimensionnement de la face 3 des aubes 2 est tel que les canaux 7, progressivement fermés à grande vitesse puis réouverts à la même vitesse, subissent un effet de tiroir rotatif de la part des aubes 2, ce qui favorise encore le mélange intime et interdit le retour de la matière vers l'intérieur du dispositif.The dimensioning of the face 3 of the blades 2 is such that the channels 7, gradually closed at high speed then reopened at the same speed, undergo a rotary slide effect on the part of the blades 2, which further promotes intimate and prohibited mixing. the return of the material towards the interior of the device.

Les dimensions et le nombre des canaux 3 et des aubes 2 sont bien entendu choisis en fonction des matières à mélanger, en particulier des gradients de forces dynamiques et d'énergies cinétiques des particules qui subissent un mouvement pulsatoire et un micro-brassage qui assurent l'homogénéité voulue.The dimensions and the number of channels 3 and vanes 2 are of course chosen according to the materials to be mixed, in particular gradients of dynamic forces and kinetic energies of the particles which undergo a pulsating movement and a micro-brewing which ensure the desired homogeneity.

La vitesse de rotation du rotor est également choisie en fonction des matières à mélanger, de leur température, etc. The rotational speed of the rotor is also chosen according to the materials to be mixed, their temperature, etc.

Claims (3)

Revendications.Claims. 1. Dispositif mélangeur-disperseur pour la préparation d'un mélange intime de matières non miscibles à granulométrie fine, caractérisé en ce qu'il comprend un rotor à aubes (2) pivotant dans un stator cylindrique de révolution (1) muni de fentes radiales ou canaux (8), la face antérieure (4), dans le sens de rotation (5) du rotor, desdites aubes (2) ayant une forme concave agencée pour produire une accélération radiale des particules vers la périphérie, les faces externes (3) desdites aubes (2) ayant une section sensiblement cylindrique de révolution se déplaçant au voisinage immédiat de la face interne dudit stator (1), la longueur desdites faces externes (3) correspondant à un pas des fentes radiales ou canaux (8), ou à un multiple de ce pas, lesdites fentes radiales ou canaux (8) présentent une courte paroi frontale antérieure (9), dans le sens de rotation (5) du rotor, sensiblement radiale et une paroi postérieure (11) plus longue et également sensiblement radiale.1. Mixer-disperser device for the preparation of an intimate mixture of immiscible materials with fine particle size, characterized in that it comprises a vane rotor (2) pivoting in a cylindrical stator of revolution (1) provided with radial slots or channels (8), the front face (4), in the direction of rotation (5) of the rotor, of said blades (2) having a concave shape arranged to produce a radial acceleration of the particles towards the periphery, the external faces (3 ) of said blades (2) having a substantially cylindrical section of revolution moving in the immediate vicinity of the internal face of said stator (1), the length of said external faces (3) corresponding to a pitch of the radial slots or channels (8), or at a multiple of this step, said radial slots or channels (8) have a short front front wall (9), in the direction of rotation (5) of the rotor, substantially radial and a rear wall (11) longer and also appreciably t radial. 2. Dispositif selon la revendication 1, caractérisé en ce que les faces postérieures (7) des aubes (2) sont sensiblement planes.2. Device according to claim 1, characterized in that the rear faces (7) of the blades (2) are substantially planar. 3. Dispositif selon l'une des revendications 1 et 2, caractérisé en ce que la courte frontale antérieure (9) des fentes radiales ou canaux (8) est prolongée par une paroi inclinée (10). 3. Device according to one of claims 1 and 2, characterized in that the short front front (9) of the radial slots or channels (8) is extended by an inclined wall (10).
FR9109734A 1991-07-31 1991-07-31 Pulsation disperser-mixer for the preparation of thermoplastic products, in particular bituminous products Withdrawn FR2679789A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR9109734A FR2679789A1 (en) 1991-07-31 1991-07-31 Pulsation disperser-mixer for the preparation of thermoplastic products, in particular bituminous products

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Application Number Priority Date Filing Date Title
FR9109734A FR2679789A1 (en) 1991-07-31 1991-07-31 Pulsation disperser-mixer for the preparation of thermoplastic products, in particular bituminous products

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008096248A1 (en) 2007-02-09 2008-08-14 Euroline S.R.L. Machine and method for homogenizing a bitumen-based mixture with polymer granules
ITTV20100088A1 (en) * 2010-06-08 2011-12-09 Euroline Srl MIXING MACHINE TO PRODUCE BITUMINOUS LIQUIDS CONGLOMERATES
WO2016152895A1 (en) * 2015-03-24 2016-09-29 エム・テクニック株式会社 Stirrer
JP6650162B1 (en) * 2019-04-15 2020-02-19 エム・テクニック株式会社 Stirrer
WO2020213184A1 (en) 2019-04-15 2020-10-22 エム・テクニック株式会社 Agitator
WO2020213048A1 (en) 2019-04-15 2020-10-22 エム・テクニック株式会社 Stirrer

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Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008096248A1 (en) 2007-02-09 2008-08-14 Euroline S.R.L. Machine and method for homogenizing a bitumen-based mixture with polymer granules
RU2455057C2 (en) * 2007-02-09 2012-07-10 Юролайн С.Р.Л. Device and method for homogenising bitumen-based mix and polymer granules
US8801265B2 (en) 2007-02-09 2014-08-12 Euroline S.R.L. Machine and method for homogenizing a bitumen-based mixture with polymer granules
ITTV20100088A1 (en) * 2010-06-08 2011-12-09 Euroline Srl MIXING MACHINE TO PRODUCE BITUMINOUS LIQUIDS CONGLOMERATES
US10478790B2 (en) 2015-03-24 2019-11-19 M. Technique Co., Ltd. Stirrer producing intermittent jet flow
CN107427794A (en) * 2015-03-24 2017-12-01 M技术株式会社 Mixer
JPWO2016152895A1 (en) * 2015-03-24 2018-01-18 エム・テクニック株式会社 Stirrer
US20180056255A1 (en) * 2015-03-24 2018-03-01 M. Technique Co., Ltd. Stirrer
WO2016152895A1 (en) * 2015-03-24 2016-09-29 エム・テクニック株式会社 Stirrer
JP2022000306A (en) * 2015-03-24 2022-01-04 エム・テクニック株式会社 Agitator
CN107427794B (en) * 2015-03-24 2021-05-07 M技术株式会社 Mixer
WO2020213048A1 (en) 2019-04-15 2020-10-22 エム・テクニック株式会社 Stirrer
WO2020213184A1 (en) 2019-04-15 2020-10-22 エム・テクニック株式会社 Agitator
KR20210150949A (en) 2019-04-15 2021-12-13 엠. 테크닉 가부시키가이샤 agitator
KR20210151059A (en) 2019-04-15 2021-12-13 엠. 테크닉 가부시키가이샤 agitator
JP6650162B1 (en) * 2019-04-15 2020-02-19 エム・テクニック株式会社 Stirrer
US20220193626A1 (en) * 2019-04-15 2022-06-23 M. Technique Co., Ltd. Stirrer
US11628412B2 (en) 2019-04-15 2023-04-18 M. Technique Co., Ltd. Stirrer
EP3957393A4 (en) * 2019-04-15 2023-07-19 M. Technique Co., Ltd. Stirrer

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