EP0962249B1 - Magnetic drive agitator - Google Patents

Magnetic drive agitator Download PDF

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Publication number
EP0962249B1
EP0962249B1 EP99420128A EP99420128A EP0962249B1 EP 0962249 B1 EP0962249 B1 EP 0962249B1 EP 99420128 A EP99420128 A EP 99420128A EP 99420128 A EP99420128 A EP 99420128A EP 0962249 B1 EP0962249 B1 EP 0962249B1
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EP
European Patent Office
Prior art keywords
coupling means
propeller
magnetic
agitator according
cell
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Revoked
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EP99420128A
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German (de)
French (fr)
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EP0962249A1 (en
Inventor
Philippe Eyraud
Guy Flavien
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Mixel
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Mixel
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
    • B01F33/45—Magnetic mixers; Mixers with magnetically driven stirrers
    • B01F33/453—Magnetic mixers; Mixers with magnetically driven stirrers using supported or suspended stirring elements
    • B01F33/4535—Magnetic mixers; Mixers with magnetically driven stirrers using supported or suspended stirring elements using a stud for supporting the stirring element

Definitions

  • the invention relates to a stirrer with magnetic drive.
  • Agitators are conventionally used for brewing a mixture located inside a container to avoid decantation or any other alteration of the mixture during time.
  • the advantage of a stirrer with magnetic drive that the setting in motion of the propeller which he understands is realized by a magnetic coupling which takes place without contact between two rotating parts, such as the shaft of output of an electric motor and the propeller associated with it. This allows this tree to be placed outside the container while the propeller is installed inside the container. Any danger of leakage from the agitator can thus be discarded. This is particularly useful when the mixture is toxic or when a pollution of it by agents exteriors should be avoided, as, for example, in the case of a drug composition.
  • the invention relates to a stirrer with magnetic drive for a mixture located in a container, this agitator being supported by a flange, mounted tightly in a wall of the container and provided with a blind sleeve inside which is housed a drive shaft provided with a first magnetic coupling means, then that a propeller arranged around this sleeve is provided with a second magnetic coupling means able to cooperate with the first magnetic coupling means for driving the propeller around an axis of rotation.
  • This agitator is characterized in that the propeller is integral with a third magnetic coupling means, placed opposite a cell detection of the passage of the third coupling means, this cell being carried by the flange.
  • the cooperation of the third means of magnetic and cell coupling can detect the effective rotational movements of the propeller and, conversely, an absence of the propeller or its blocking.
  • the cell As the cell is carried by the flange, it can be pre-mounted on it before placing the flange in the corresponding hole of the container, so that the positioning of the propeller by report to the cell can be fine tuned, in optimal conditions for an operator. No additional drilling is only necessary for the installation of the cell detection, which is a safety factor for sealing of the container.
  • the invention goes against a common prejudice in the field of magnetic stirrers where the intensity of the magnetic field used for the rotational drive of the helix, i.e. the intense magnetic field prevailing between the first and second magnetic coupling means, would be likely to disturb the measurements carried out thanks to a magnetic field in the vicinity of these coupling means.
  • the field magnetic reigning between the first and second means of magnetic coupling is closed at these means, so that it does not disturb the coupling made between the third magnetic coupling means and the detection cell, and this, including in the case where this third coupling means is disposed in the immediate vicinity of the first and second means of coupling.
  • the third magnetic coupling means comprises at least one permanent magnet.
  • a permanent magnet is of dimensions and limited cost, so there is no risk of imbalance the propeller or strain the economic performance of the device.
  • the air gap between the third coupling means and the cell detection is generally perpendicular to the axis of rotation of the propeller.
  • This aspect of the invention very significantly limits the interference between the magnetic field of drive, created between the first and second magnetic coupling means, and the magnetic detection or measurement field created between the third coupling means and the cell.
  • the first and second coupling means form a magnetic field extending along an essentially radial direction around the axis of rotation of the propeller, the magnetic field created between the third coupling means and the detection cell being generally parallel to this axis of rotation.
  • the second and third coupling means can be mounted on a sleeve placed around the sleeve blind, the third coupling means being oriented towards the detection cell.
  • the first and second magnetic coupling means comprise each at least one permanent magnet whose direction of polarization is oriented radially with respect to the sleeve.
  • the third coupling means comprises a permanent magnet
  • the magnet of the third coupling means magnetic is arranged so that its direction of polarization is generally perpendicular to the direction of polarization of the magnets of the first and second means of coupling.
  • the signal output from the detection cell is supplied to a processing capable of determining, by calculation, from this signal, the speed of rotation of the propeller. So the device of the invention makes it possible to fulfill both a function of control of the effective rotation of the propeller and tachometer.
  • the flange includes a blind cell receiving housing detection, the opening of this housing being turned towards the outside of the flange. This aspect of the invention ensures that the detection cell cannot in any case be in contact direct with the mixture contained in the container, which avoids any risk of pollution of the mixture or contamination of the cell.
  • the propeller includes several blades distributed around a sheath and a head with several branches supporting this sheath, a annular space being provided between the branches and a portion end of the sleeve forming a bearing. This annular space facilitates cleaning of the propeller mounted on the blind sleeve.
  • a container 1 is formed of a tank 2 in which is placed a mixture 3 while a cover 4 is provided to close an upper opening of the tank.
  • a flange 5 of non-magnetic material supporting a magnetic stirrer comprising an electric drive motor 6, located outside of the tank 2, and a propeller 7, disposed at the 'interior of the tank in the mixture 3.
  • the rotation of the propeller 7 by the electric motor 6 results in a displacement of its blades 8 around an axis of rotation X-X', which has the effect of stir the mixture 3.
  • a bevel gear 9 is arranged at the outlet of the motor 6 and its output shaft is constituted by a shaft 10 partially visible in Figure 2.
  • This shaft 10 is made integral with a hollow shaft 11 by means of a fixing screw 12. It would also possible to mount motor 6 in direct connection to a shaft 10, the use of a bevel gear not being essential.
  • the hollow shaft 11 carries two rows of permanent magnets 13 regularly distributed around the periphery of the tree 11.
  • the North-South polarity of the magnets 13 is directed in directions Y-Y 'or Y-Y "generally perpendicular to the axis X-X'.
  • the rotation of the shaft 10 by the motor 6 results in the magnets 13 rotating around the axis XX 'while their respective polarity lines are oriented perpendicular to this axis.
  • the flange 5 is mounted on the wall 2 a of the tank 2 by a weld bead 14, so that the assembly thus produced is sealed.
  • the flange 5 is shaped into a sleeve 15, the end of which is closed by a plate 16 welded to the sleeve 15.
  • the assembly between the sleeve 15 and the plate 16 is sealed.
  • the plate 16 on the sleeve 15 the latter is blind in the sense that it does not open into the interior of the tank 2.
  • a bearing 17 is mounted on the plate 16 by means of a screw 18 received in a blind thread 19 of the plate 16.
  • the bearing 17 carries a ring 20 whose outer surface 20 a constitutes a bearing surface.
  • the propeller 7 comprises a head 21 formed of a ring 22 whose internal circular surface 22 a is intended to fit around the surface 20 a of the ring 20.
  • a smooth bearing is thus produced by smooth contact, for example metal / metal, between surfaces 20 a and 22 a .
  • Three branches 22 b regularly distributed on the periphery of the ring 22 extend radially outward from the latter and support a sheath 23 disposed around the blind sleeve 15, radially outside of the latter.
  • This sheath 23 carries, on its outer surface, two rows of permanent magnets 24 arranged opposite the magnets 13 carried by the hollow shaft 11.
  • the North-South polarity of the magnets 24 is directed in the directions YY ′ or YY ′′.
  • An insert 25, made of stainless steel, is placed outside the magnets 24 to form, with the sheath 23, a cylindrical sleeve onto which the blades 8 of the propeller 7 can be welded.
  • the rotation of the hollow shaft 11 results in a rotation of the magnets 13, which has the effect, given the magnetic field created between these magnets 13 and the corresponding magnets 24, to exercise on propeller 7 a couple with the same direction as the direction of rotation of the shaft 11 around the axis XX '.
  • Propeller 7 is thus driven in rotation about the axis XX ', without contact direct mechanical between shaft 11 and propeller 7.
  • a permanent magnet 30 is disposed at the bottom of the part 25, that is to say on the side of this part directed towards the flange 5.
  • the North-South polarity of the magnet 30 is disposed in a direction ZZ 'generally parallel to the axis XX '.
  • a blind bore 31 is provided, the opening 31 a of which is arranged at an external surface 5 a of the flange 5, that is to say of a surface facing the return d angle 9.
  • a measuring cell 33 capable of detecting the proximity of the magnet 30 is installed in the bore 31.
  • An air gap e is defined between the magnet 30 and the cell 33. In this air gap is created, at each passage of the magnet 30 opposite cell 33, a transient magnetic field which can be detected by cell 33 and transformed into an output or "top" signal which can be transmitted to a processing unit 34 by an electrically conductive cable 35.
  • the magnet 30 passes, at each turn, opposite the cell 33 which detects this passage thanks to the variation of the magnetic field created in the temporary air gap e , for example by creation of an eddy current in the cell 33.
  • the effective rotation of the propeller 7 is detected by the cell 33.
  • the intense electromagnetic field created at an air gap e 'between the magnets 13 and 24 through the sleeve 15 and the sheath 23 does not disturb the electromagnetic field temporarily prevailing in the air gap e , because the electromagnetic field created in the air gap e 'is closed by magnets 13 and 24.
  • the electromagnetic field prevailing between magnets 13 and 24 extends in an essentially radial direction, around the axis XX', while the temporary electromagnetic field created between the magnet 30 and the cell 33 extends in a direction generally parallel to the direction Z-Z '.
  • the parts visible in Figure 2 are, for the most part, made of a non-magnetic material, for example steel stainless, so as not to disturb the electromagnetic fields created between magnets 13 and 24 or between magnet 30 and cell 33.
  • a non-magnetic material for example steel stainless
  • attachment 25 could be deleted if the sheath 23 was produced by overmolding magnets 24 and 30.
  • the invention has been described with a single magnet 30, but it is possible to use several magnets regularly distributed around the X-X 'axis, which gives better precision in the measurement chain carried out with cell 33.
  • the unit 34 is advantageously provided for determining by, the calculation, the rotational speed of the propeller 7, which is easy since it suffices to count the number of tops received from the cell 33 during a time interval.
  • the invention therefore makes it possible to produce a tachometer for a stirrer magnetic drive.
  • An annular space 40 is provided between the branches 22b of the head 31 of the propeller 7 and the bearing 17, which allows easy cleaning of the propeller 7, including when it is kept in place on the blind sleeve 15, that is to say without disassembly of the propeller.
  • All types of magnetic effect detection cells can be used with the agitator of the invention.
  • the invention has been shown with two rows of magnets 13 and 24. However, the number and distribution of these magnets are variable. They can be arranged in a single row or, on the contrary, in more than two rows, depending on the torque to transmit and propeller geometry.

Description

L'invention a trait à un agitateur à entraínement magnétique.The invention relates to a stirrer with magnetic drive.

Des agitateurs sont classiquement utilisés pour brasser un mélange situé à l'intérieur d'un récipient afin d'éviter une décantation ou tout autre altération du mélange au cours du temps. Un agitateur à entraínement magnétique présente l'avantage que la mise en mouvement de l'hélice qu'il comprend est réalisée par un couplage magnétique qui a lieu sans contact physique entre deux parties tournantes, telles que l'arbre de sortie d'un moteur électrique et l'hélice qui lui est associée. Ceci permet de disposer cet arbre à l'extérieur du récipient alors que l'hélice est installée à l'intérieur du récipient. Tout danger de fuite au niveau de l'agitateur peut ainsi être écarté. Ceci est particulièrement utile lorsque le mélange est toxique ou lorsque une pollution de celui-ci par des agents extérieurs doit être évitée, comme, par exemple, dans le cas d'une composition médicamenteuse.Agitators are conventionally used for brewing a mixture located inside a container to avoid decantation or any other alteration of the mixture during time. The advantage of a stirrer with magnetic drive that the setting in motion of the propeller which he understands is realized by a magnetic coupling which takes place without contact between two rotating parts, such as the shaft of output of an electric motor and the propeller associated with it. This allows this tree to be placed outside the container while the propeller is installed inside the container. Any danger of leakage from the agitator can thus be discarded. This is particularly useful when the mixture is toxic or when a pollution of it by agents exteriors should be avoided, as, for example, in the case of a drug composition.

Dans les dispositifs connus, cette absence de lien mécanique entre l'arbre d'entraínement et l'hélice peut conduire à des erreurs de manipulation ou à des blocages qui ne peuvent pas être décelés avant une vidange complète du récipient. Ainsi, un opérateur peut oublier d'installer l'hélice à l'intérieur du récipient alors que l'arbre de mise en mouvement de l'hélice tourne normalement et que l'on peut être amené à croire que l'agitateur remplit sa fonction. Un mélange pouvant être brassé pendant une durée relativement longue, de l'ordre de plusieurs jours, voire de plusieurs semaines, si l'on se rend compte de cet oubli au terme de la manipulation, de nombreuses heures de travail sont perdues ainsi que le produit à forte valeur ajoutée. De la même manière, il peut arriver qu'une hélice se coince, notamment du fait de l'inhomogénéité du mélange contenu dans le récipient. Un tel coincement n'est pas détecté par un coincement correspondant de l'arbre puisque celui-ci n'est pas lié mécaniquement à l'hélice.In known devices, this absence of link mechanical between the drive shaft and the propeller can lead to handling errors or blockages which cannot be detected before the container is completely emptied. Thus, an operator can forget to install the propeller to the inside of the container while the shaft moving of the propeller turns normally and that one can be brought to believe that the agitator is fulfilling its function. A mixture that can be brewed for a relatively long time, of the order several days, or even several weeks, if you remember accounts for this oversight at the end of the manipulation, many hours of work are lost as well as the product with high added value. In the same way, it can happen that a propeller gets stuck, in particular due to inhomogeneity of the mixture contained in the container. Such jamming is not not detected by a corresponding jamming of the tree since it is not mechanically linked to the propeller.

Pour obvier aux problèmes ci-dessus, on pourrait envisager d'installer un capteur, par exemple capacitif, dans le voisinage de l'agitateur. L'installation de ce capteur nécessiterait la réalisation d'un perçage supplémentaire dans la paroi du récipient, ce qui augmenterait les risques de fuite et de mauvais nettoyage et nécessiterait des opérations de mise en place précises pour le réglage de ce capteur par rapport à l'hélice à l'intérieur du récipient, c'est-à-dire dans une zone d'accès réduit. Ceci résulterait dans un sur-coût du dispositif.To overcome the above problems, one could consider to install a sensor, for example capacitive, in the vicinity of the agitator. The installation of this sensor would require making an additional hole in the wall of the container, which would increase the risk of leakage and improper cleaning and would require setting up operations precise place for the adjustment of this sensor in relation to the propeller inside the container, i.e. in an area reduced access. This would result in an over-cost of the device.

C'est à ces inconvénients qu'entend plus particulièrement remédier l'invention en proposant un agitateur à entraínement magnétique dans lequel un défaut de rotation de l'hélice peut être détecté immédiatement sans qu'il soit nécessaire de réaliser de perçages supplémentaires dans la paroi du récipient.It is to these disadvantages that we hear more particularly remedy the invention by proposing a drive agitator magnetic in which a defect in the rotation of the propeller can be detected immediately without the need to make additional holes in the wall of the container.

Dans cet esprit, l'invention concerne un agitateur à entraínement magnétique pour un mélange situé dans un récipient, cet agitateur étant supporté par une bride, montée de façon étanche dans une paroi du récipient et pourvue d'un manchon borgne à l'intérieur duquel est logé un arbre d'entraínement muni d'un premier moyen de couplage magnétique, alors qu'une hélice disposée autour de ce manchon est pourvue d'un second moyen de couplage magnétique apte à coopérer avec le premier moyen de couplage magnétique pour l'entraínement de l'hélice autour d'un axe de rotation. Cet agitateur est caractérisé en ce que l'hélice est solidaire d'un troisième moyen de couplage magnétique, disposé en regard d'une cellule de détection du passage du troisième moyen de couplage, cette cellule étant portée par la bride.In this spirit, the invention relates to a stirrer with magnetic drive for a mixture located in a container, this agitator being supported by a flange, mounted tightly in a wall of the container and provided with a blind sleeve inside which is housed a drive shaft provided with a first magnetic coupling means, then that a propeller arranged around this sleeve is provided with a second magnetic coupling means able to cooperate with the first magnetic coupling means for driving the propeller around an axis of rotation. This agitator is characterized in that the propeller is integral with a third magnetic coupling means, placed opposite a cell detection of the passage of the third coupling means, this cell being carried by the flange.

Grâce à l'invention, la coopération du troisième moyen de couplage magnétique et de la cellule permet de détecter les mouvements de rotation effectifs de l'hélice et, a contrario, une absence de l'hélice ou son blocage. Comme la cellule est portée par la bride, elle peut être pré-montée sur celle-ci avant la mise en place de la bride dans l'orifice correspondant du récipient, de sorte que le positionnement de l'hélice par rapport à la cellule peut être réglé avec précision, dans des conditions optimales pour un opérateur. Aucun perçage supplémentaire n'est nécessaire pour la mise en place de la cellule de détection, ce qui est un facteur de sécurité pour l'étanchéité du récipient. Thanks to the invention, the cooperation of the third means of magnetic and cell coupling can detect the effective rotational movements of the propeller and, conversely, an absence of the propeller or its blocking. As the cell is carried by the flange, it can be pre-mounted on it before placing the flange in the corresponding hole of the container, so that the positioning of the propeller by report to the cell can be fine tuned, in optimal conditions for an operator. No additional drilling is only necessary for the installation of the cell detection, which is a safety factor for sealing of the container.

L'invention va à l'encontre d'un préjugé commun dans le domaine des agitateurs magnétiques selon lequel l'intensité du champ magnétique utilisé pour l'entraínement en rotation de l'hélice, c'est-à-dire du champ magnétique intense régnant entre les premier et second moyens de couplage magnétique, serait de nature à perturber les mesures effectuées grâce à un champ magnétique au voisinage de ces moyens de couplage. En fait, il a pu être déterminé expérimentalement que le champ magnétique régnant entre les premier et second moyens de couplage magnétique est fermé au niveau de ces moyens, de sorte qu'il ne perturbe pas le couplage réalisé entre le troisième moyen de couplage magnétique et la cellule de détection, et ce, y compris dans le cas ou ce troisième moyen de couplage est disposé à proximité immédiate des premier et second moyens de couplage.The invention goes against a common prejudice in the field of magnetic stirrers where the intensity of the magnetic field used for the rotational drive of the helix, i.e. the intense magnetic field prevailing between the first and second magnetic coupling means, would be likely to disturb the measurements carried out thanks to a magnetic field in the vicinity of these coupling means. In done it could be determined experimentally that the field magnetic reigning between the first and second means of magnetic coupling is closed at these means, so that it does not disturb the coupling made between the third magnetic coupling means and the detection cell, and this, including in the case where this third coupling means is disposed in the immediate vicinity of the first and second means of coupling.

Selon un premier aspect avantageux de l'invention, le troisième moyen de couplage magnétique comprend au moins un aimant permanent. Un tel aimant permanent est de dimensions et de coût restreints, de sorte qu'il ne risque pas de déséquilibrer l'hélice ou de grever les performances économiques du dispositif.According to a first advantageous aspect of the invention, the third magnetic coupling means comprises at least one permanent magnet. Such a permanent magnet is of dimensions and limited cost, so there is no risk of imbalance the propeller or strain the economic performance of the device.

Selon un autre aspect avantageux de l'invention, l'entrefer entre le troisième moyen de couplage et la cellule de détection est globalement perpendiculaire à l'axe de rotation de l'hélice. Cet aspect de l'invention limite très sensiblement les interférences entre le champ magnétique d'entraínement, créé entre les premier et second moyens de couplage magnétique, et le champ magnétique de détection ou de mesure, créé entre le troisième moyen de couplage et la cellule.According to another advantageous aspect of the invention, the air gap between the third coupling means and the cell detection is generally perpendicular to the axis of rotation of the propeller. This aspect of the invention very significantly limits the interference between the magnetic field of drive, created between the first and second magnetic coupling means, and the magnetic detection or measurement field created between the third coupling means and the cell.

Dans ce cas, on peut prévoir que les premier et second moyens de couplage forment un champ magnétique s'étendant selon une direction essentiellement radiale autour de l'axe de rotation de l'hélice, le champ magnétique créé entre le troisième moyen de couplage et la cellule de détection étant globalement parallèle à cet axe de rotation.In this case, we can predict that the first and second coupling means form a magnetic field extending along an essentially radial direction around the axis of rotation of the propeller, the magnetic field created between the third coupling means and the detection cell being generally parallel to this axis of rotation.

En particulier, les second et troisième moyens de couplage peuvent être montés sur un fourreau placé autour du manchon borgne, le troisième moyen de couplage étant orienté vers la cellule de détection.In particular, the second and third coupling means can be mounted on a sleeve placed around the sleeve blind, the third coupling means being oriented towards the detection cell.

Selon un autre aspect avantageux de l'invention, les premier et second moyens de couplage magnétique comprennent chacun au moins un aimant permanent dont la direction de polarisation est orientée radialement par rapport au manchon. Dans ce cas, et lorsque le troisième moyen de couplage comprend un aimant permanent, l'aimant du troisième moyen de couplage magnétique est disposé de telle sorte que sa direction de polarisation est globalement perpendiculaire à la direction de polarisation des aimants des premier et second moyens de couplage.According to another advantageous aspect of the invention, the first and second magnetic coupling means comprise each at least one permanent magnet whose direction of polarization is oriented radially with respect to the sleeve. In this case, and when the third coupling means comprises a permanent magnet, the magnet of the third coupling means magnetic is arranged so that its direction of polarization is generally perpendicular to the direction of polarization of the magnets of the first and second means of coupling.

Selon un autre aspect avantageux de l'invention, le signal de sortie de la cellule de détection est fourni à une unité de traitement apte à déterminer, par le calcul, à partir de ce signal, la vitesse de rotation de l'hélice. Ainsi, le dispositif de l'invention permet de remplir à la fois une fonction de contrôle de la rotation effective de l'hélice et de tachymètre.According to another advantageous aspect of the invention, the signal output from the detection cell is supplied to a processing capable of determining, by calculation, from this signal, the speed of rotation of the propeller. So the device of the invention makes it possible to fulfill both a function of control of the effective rotation of the propeller and tachometer.

Selon un autre aspect avantageux de l'invention, la bride comprend un logement borgne de réception de la cellule de détection, l'ouverture de ce logement étant tournée vers l'extérieur de la bride. Cet aspect de l'invention garantit que la cellule de détection ne peut en aucun cas être en contact direct avec le mélange contenu dans le récipient, ce qui évite tout risque de pollution du mélange ou de souillure de la cellule.According to another advantageous aspect of the invention, the flange includes a blind cell receiving housing detection, the opening of this housing being turned towards the outside of the flange. This aspect of the invention ensures that the detection cell cannot in any case be in contact direct with the mixture contained in the container, which avoids any risk of pollution of the mixture or contamination of the cell.

Selon un autre aspect avantageux de l'invention, l'hélice comprend plusieurs pales réparties autour d'un fourreau et une tête munie de plusieurs branches soutenant ce fourreau, un espace annulaire étant ménagé entre les branches et une partie terminale du manchon formant palier. Cet espace annulaire facilite le nettoyage de l'hélice montée sur le manchon borgne.According to another advantageous aspect of the invention, the propeller includes several blades distributed around a sheath and a head with several branches supporting this sheath, a annular space being provided between the branches and a portion end of the sleeve forming a bearing. This annular space facilitates cleaning of the propeller mounted on the blind sleeve.

L'invention sera mieux comprise et d'autres avantages de celle-ci apparaítront plus clairement à la lumière de la description qui va suivre d'un mode de réalisation d'un agitateur à entraínement magnétique conforme à son principe, donnée uniquement à titre d'exemple et faite en référence aux dessins annexés dans lesquels :

  • la figure 1 est une représentation schématique de principe d'un récipient pour mélanges équipé d'un agitateur conforme à l'invention ;
  • la figure 2 est une vue à plus grande échelle du détail II de la figure 1, l'agitateur étant représenté en coupe.
The invention will be better understood and other advantages thereof will appear more clearly in the light of the following description of an embodiment of a stirrer with magnetic drive in accordance with its principle, given solely by way of illustration. 'example and made with reference to the accompanying drawings in which:
  • Figure 1 is a schematic representation of the principle of a container for mixtures equipped with an agitator according to the invention;
  • Figure 2 is an enlarged view of detail II of Figure 1, the agitator being shown in section.

A la figure 1, un récipient 1 est formé d'une cuve 2 dans laquelle est disposé un mélange 3 alors qu'un couvercle 4 est prévu pour obturer une ouverture supérieure de la cuve. Dans la paroi de fond 2a de la cuve 2 est disposée une bride 5 en matériau amagnétique supportant un agitateur magnétique comprenant un moteur électrique d'entraínement 6, situé à l'extérieur de la cuve 2, et une hélice 7, disposée à l'intérieur de la cuve dans le mélange 3. La mise en rotation de l'hélice 7 par le moteur électrique 6 résulte dans un déplacement de ses pales 8 autour d'un axe de rotation X-X', ce qui a pour effet de brasser le mélange 3.In Figure 1, a container 1 is formed of a tank 2 in which is placed a mixture 3 while a cover 4 is provided to close an upper opening of the tank. In the bottom wall 2 a of the tank 2 is disposed a flange 5 of non-magnetic material supporting a magnetic stirrer comprising an electric drive motor 6, located outside of the tank 2, and a propeller 7, disposed at the 'interior of the tank in the mixture 3. The rotation of the propeller 7 by the electric motor 6 results in a displacement of its blades 8 around an axis of rotation X-X', which has the effect of stir the mixture 3.

Un renvoi d'angle 9 est disposé à la sortie du moteur 6 et son arbre de sortie est constitué par un arbre 10 partiellement visible à la figure 2. Cet arbre 10 est rendu solidaire d'un arbre creux 11 au moyen d'une vis de fixation 12. Il serait également possible de monter le moteur 6 en prise directe sur un arbre 10, l'utilisation d'un renvoi d'angle n'étant pas indispensable.A bevel gear 9 is arranged at the outlet of the motor 6 and its output shaft is constituted by a shaft 10 partially visible in Figure 2. This shaft 10 is made integral with a hollow shaft 11 by means of a fixing screw 12. It would also possible to mount motor 6 in direct connection to a shaft 10, the use of a bevel gear not being essential.

L'arbre creux 11 porte deux rangées d'aimants permanents 13 régulièrement répartis à la périphérie de l'arbre 11. La polarité Nord-Sud des aimants 13 est dirigée selon des direction Y-Y' ou Y-Y" globalement perpendiculaires à l'axe X-X'. Ainsi, la mise en rotation de l'arbre 10 par le moteur 6 résulte dans une mise en rotation des aimants 13 autour de l'axe X-X' alors que leurs lignes de polarité respectives sont orientées perpendiculairement par rapport à cet axe.The hollow shaft 11 carries two rows of permanent magnets 13 regularly distributed around the periphery of the tree 11. The North-South polarity of the magnets 13 is directed in directions Y-Y 'or Y-Y "generally perpendicular to the axis X-X'. Thus, the rotation of the shaft 10 by the motor 6 results in the magnets 13 rotating around the axis XX 'while their respective polarity lines are oriented perpendicular to this axis.

La bride 5 est montée sur la paroi 2a de la cuve 2 par un cordon de soudure 14, de sorte que l'assemblage ainsi réalisé est étanche. La bride 5 est conformée en un manchon 15 dont l'extrémité est obturée par une plaque 16 soudée sur le manchon 15. Ainsi, l'assemblage entre le manchon 15 et la plaque 16 est étanche. Compte tenu de la fixation de la plaque 16 sur le manchon 15, celui-ci est borgne en ce sens qu'il ne débouche pas à l'intérieur de la cuve 2.The flange 5 is mounted on the wall 2 a of the tank 2 by a weld bead 14, so that the assembly thus produced is sealed. The flange 5 is shaped into a sleeve 15, the end of which is closed by a plate 16 welded to the sleeve 15. Thus, the assembly between the sleeve 15 and the plate 16 is sealed. Given the fixing of the plate 16 on the sleeve 15, the latter is blind in the sense that it does not open into the interior of the tank 2.

Un palier 17 est monté sur la plaque 16 au moyen d'une vis 18 reçue dans un taraudage borgne 19 de la plaque 16. Le palier 17 porte une bague 20 dont la surface extérieure 20a constitue une surface de palier. L'hélice 7 comprend une tête 21 formée d'une bague 22 dont la surface circulaire interne 22a est destinée à s'emboíter autour de la surface 20a de la bague 20. Un palier lisse est ainsi réalisé par contact lisse, par exemple métal/métal, entre les surfaces 20a et 22a.A bearing 17 is mounted on the plate 16 by means of a screw 18 received in a blind thread 19 of the plate 16. The bearing 17 carries a ring 20 whose outer surface 20 a constitutes a bearing surface. The propeller 7 comprises a head 21 formed of a ring 22 whose internal circular surface 22 a is intended to fit around the surface 20 a of the ring 20. A smooth bearing is thus produced by smooth contact, for example metal / metal, between surfaces 20 a and 22 a .

Trois branches 22b régulièrement réparties à la périphérie de la bague 22 s'étendent radialement vers l'extérieur à partir de celle-ci et supportent un fourreau 23 disposé autour du manchon borgne 15, radialement à l'extérieur de celui-ci. Ce fourreau 23 porte, sur sa surface externe, deux rangées d'aimants permanents 24 disposés en regard des aimants 13 portés par l'arbre creux 11. La polarité Nord-Sud des aimants 24 est dirigée selon les directions Y-Y' ou Y-Y". Une pièce rapportée 25, réalisée en acier inoxydable, est disposée à l'extérieur des aimants 24 pour constituer, avec le fourreau 23, un manchon cylindrique sur lequel peuvent être soudées les pales 8 de l'hélice 7.Three branches 22 b regularly distributed on the periphery of the ring 22 extend radially outward from the latter and support a sheath 23 disposed around the blind sleeve 15, radially outside of the latter. This sheath 23 carries, on its outer surface, two rows of permanent magnets 24 arranged opposite the magnets 13 carried by the hollow shaft 11. The North-South polarity of the magnets 24 is directed in the directions YY ′ or YY ″. An insert 25, made of stainless steel, is placed outside the magnets 24 to form, with the sheath 23, a cylindrical sleeve onto which the blades 8 of the propeller 7 can be welded.

Compte tenu de ce qui précède, la mise en rotation de l'arbre creux 11 résulte dans une mise en rotation des aimants 13, ce qui a pour effet, compte tenu du champ magnétique créé entre ces aimants 13 et les aimants correspondants 24, d'exercer sur l'hélice 7 un couple de même sens que le sens de rotation de l'arbre 11 autour de l'axe X-X'. L'hélice 7 est ainsi entraínée en rotation autour de l'axe X-X', sans contact mécanique direct entre l'arbre 11 et l'hélice 7.In view of the above, the rotation of the hollow shaft 11 results in a rotation of the magnets 13, which has the effect, given the magnetic field created between these magnets 13 and the corresponding magnets 24, to exercise on propeller 7 a couple with the same direction as the direction of rotation of the shaft 11 around the axis XX '. Propeller 7 is thus driven in rotation about the axis XX ', without contact direct mechanical between shaft 11 and propeller 7.

Un aimant permanent 30 est disposé dans le bas de la pièce 25, c'est-à-dire du côté de cette pièce dirigée vers la bride 5. La polarité Nord-Sud de l'aimant 30 est disposée selon une direction Z-Z' globalement parallèle à l'axe X-X'. Dans la bride 5, il est prévu un perçage borgne 31 dont l'ouverture 31a est disposée au niveau d'une surface extérieure 5a de la bride 5, c'est-à-dire d'une surface tournée vers le renvoi d'angle 9. Une cellule de mesure 33 apte à détecter la proximité de l'aimant 30 est installée dans le perçage 31. Un entrefer e est défini entre l'aimant 30 et la cellule 33. Dans cet entrefer est créé, lors de chaque passage de l'aimant 30 en regard de la cellule 33, un champ magnétique transitoire qui peut être détecté par la cellule 33 et transformé en un signal de sortie ou "top" pouvant être transmis à une unité de traitement 34 par un câble électriquement conducteur 35.A permanent magnet 30 is disposed at the bottom of the part 25, that is to say on the side of this part directed towards the flange 5. The North-South polarity of the magnet 30 is disposed in a direction ZZ 'generally parallel to the axis XX '. In the flange 5, a blind bore 31 is provided, the opening 31 a of which is arranged at an external surface 5 a of the flange 5, that is to say of a surface facing the return d angle 9. A measuring cell 33 capable of detecting the proximity of the magnet 30 is installed in the bore 31. An air gap e is defined between the magnet 30 and the cell 33. In this air gap is created, at each passage of the magnet 30 opposite cell 33, a transient magnetic field which can be detected by cell 33 and transformed into an output or "top" signal which can be transmitted to a processing unit 34 by an electrically conductive cable 35.

Le fonctionnement est le suivant :The operation is as follows:

Lorsque l'hélice 7 est mise en mouvement grâce à la coopération des aimants 13 et 24, l'aimant 30 passe, à chaque tour, en regard de la cellule 33 qui détecte ce passage grâce à la variation du champ magnétique créé dans l'entrefer temporaire e, par exemple par création d'un courant de Foucault dans la cellule 33. Ainsi, la mise en rotation effective de l'hélice 7 est-elle détectée par la cellule 33.When the propeller 7 is set in motion thanks to the cooperation of the magnets 13 and 24, the magnet 30 passes, at each turn, opposite the cell 33 which detects this passage thanks to the variation of the magnetic field created in the temporary air gap e , for example by creation of an eddy current in the cell 33. Thus, the effective rotation of the propeller 7 is detected by the cell 33.

Le champ électromagnétique intense créé au niveau d'un entrefer e' entre les aimants 13 et 24 à travers le manchon 15 et le fourreau 23 ne perturbe pas le champ électromagnétique régnant temporairement dans l'entrefer e, car le champ électromagnétique créé dans l'entrefer e' est fermé par les aimants 13 et 24. En outre, le champ électromagnétique régnant entre les aimants 13 et 24 s'étend dans une direction essentiellement radiale, autour de l'axe X-X', alors que le champ électromagnétique temporaire créé entre l'aimant 30 et la cellule 33 s'étend dans une direction globalement parallèle à la direction Z-Z'.The intense electromagnetic field created at an air gap e 'between the magnets 13 and 24 through the sleeve 15 and the sheath 23 does not disturb the electromagnetic field temporarily prevailing in the air gap e , because the electromagnetic field created in the air gap e 'is closed by magnets 13 and 24. In addition, the electromagnetic field prevailing between magnets 13 and 24 extends in an essentially radial direction, around the axis XX', while the temporary electromagnetic field created between the magnet 30 and the cell 33 extends in a direction generally parallel to the direction Z-Z '.

Comme le perçage 31 est borgne, il n'existe pas de contact entre le mélange 3 et la cellule 33, ce qui évite tout risque de pollution du mélange et tout risque de souillure de la cellule.As the hole 31 is blind, there is no contact between mixture 3 and cell 33, which avoids any risk pollution of the mixture and any risk of soiling of the cell.

Les pièces visibles à la figure 2 sont, pour l'essentiel, réalisées en un matériau amagnétique, par exemple en acier inoxydable, afin de ne pas perturber les champs électromagnétiques créés entre les aimants 13 et 24 ou entre l'aimant 30 et la cellule 33.The parts visible in Figure 2 are, for the most part, made of a non-magnetic material, for example steel stainless, so as not to disturb the electromagnetic fields created between magnets 13 and 24 or between magnet 30 and cell 33.

Il convient de noter que la pièce rapportée 25 pourrait être supprimée si le fourreau 23 était réalisé par surmoulage des aimants 24 et 30.It should be noted that the attachment 25 could be deleted if the sheath 23 was produced by overmolding magnets 24 and 30.

L'invention a été décrite avec un unique aimant 30, mais il est possible d'utiliser plusieurs aimants régulièrement répartis autour de l'axe X-X', ce qui confère une meilleure précision à la chaíne de mesure réalisée avec la cellule 33.The invention has been described with a single magnet 30, but it is possible to use several magnets regularly distributed around the X-X 'axis, which gives better precision in the measurement chain carried out with cell 33.

L'unité 34 est avantageusement prévue pour déterminer par, le calcul, la vitesse de rotation de l'hélice 7, ce qui est aisé puisqu'il suffit de compter le nombre de tops reçus de la cellule 33 au cours d'un intervalle de temps. L'invention permet donc de réaliser un tachymètre pour un agitateur à entraínement magnétique.The unit 34 is advantageously provided for determining by, the calculation, the rotational speed of the propeller 7, which is easy since it suffices to count the number of tops received from the cell 33 during a time interval. The invention therefore makes it possible to produce a tachometer for a stirrer magnetic drive.

Un espace annulaire 40 est ménagé entre les branches 22b de la tête 31 de l'hélice 7 et le palier 17, ce qui permet un nettoyage aisé de l'hélice 7, y compris lorsqu'elle est conservée en place sur le manchon borgne 15, c'est-à-dire sans démontage de l'hélice.An annular space 40 is provided between the branches 22b of the head 31 of the propeller 7 and the bearing 17, which allows easy cleaning of the propeller 7, including when it is kept in place on the blind sleeve 15, that is to say without disassembly of the propeller.

Tout type de cellule de détection par effet magnétique peut être utilisé avec l'agitateur de l'invention.All types of magnetic effect detection cells can be used with the agitator of the invention.

L'invention a été représentée avec deux rangées d'aimants 13 et 24. Cependant, le nombre et la répartition de ces aimants sont variables. Ils peuvent être disposés en une seule rangée ou, au contraire, en plus de deux rangées, en fonction du couple à transmettre et de la géométrie de l'hélice.The invention has been shown with two rows of magnets 13 and 24. However, the number and distribution of these magnets are variable. They can be arranged in a single row or, on the contrary, in more than two rows, depending on the torque to transmit and propeller geometry.

Claims (10)

  1. Agitator with magnetic drive for a mixture (3) located in a receptacle (1), the said agitator being supported by a collar, fitted in a wall (2a) of the said receptacle such that a seal is produced, and provided with a blind sleeve (15) inside which a drive shaft (11) equipped with first magnetic coupling means (13) is accommodated, whilst a propeller (7) arranged around the said sleeve is equipped with second magnetic coupling means (24) capable of interacting with the said first magnetic coupling means for driving the said propeller about an axis of rotation (X-X'), characterised in that the said propeller (7) is integral with third magnetic coupling means (30) arranged opposite a cell (33) for detecting when the said third magnetic coupling means pass by, the said cell being borne by the said collar (5).
  2. Agitator according to Claim 1, characterised in that the said third magnetic coupling means comprise at least one permanent magnet (30).
  3. Agitator according to one of Claims 1 or 2, characterised in that the air gap (e) between the said third coupling means (30) and the said detection cell (3 (sic)) is on the whole perpendicular to the axis of rotation (X-X') of the said propeller (7).
  4. Agitator according to Claim 3, characterised in that the said first (13) and second (24) coupling means form a magnetic field extending in an essentially radial direction (Y-Y', Y-Y") around the said axis of rotation (X-X') of the said propeller (7), the magnetic field created between the said third coupling means (30) and the said detection cell (33) being on the whole parallel to the said axis of rotation.
  5. Agitator according to Claim 4, characterised in that the said second (24) and third (30) coupling means are mounted on a sheath (23) positioned around the said blind sleeve (15), the said third coupling means (30) being oriented towards the said detection cell (33).
  6. Agitator according to one of the preceding claims, characterised in that the said first (13) and second (24) magnetic coupling means each comprise at least one permanent magnet (13, 24), the direction of polarisation (Y-Y', Y-Y") of which is oriented radially with respect to the said sleeve (15).
  7. Agitator according to Claims 2 and 6, characterised in that the said magnet (30) of the said third magnetic coupling means is arranged such that its direction of polarisation is on the whole perpendicular to the direction of polarisation (Y-Y', Y-Y") of the magnets (13, 24) of the first and second coupling means.
  8. Agitator according to one of the preceding claims, characterised in that the output signal from the said detection cell (33) is fed to a processing unit (34) capable of determining the speed of rotation of the said propeller (7) from the said signal by calculation.
  9. Agitator according to one of the preceding claims, characterised in that the said collar (5) has a blind seat (31) for accommodating the said detection cell (33), the opening (31a) of the said seat being turned towards the outside (5a) of the said collar.
  10. Agitator according to one of the preceding claims, characterised in that the said propeller (7) has several blades (8) distributed around a sheath (23) and a head (21) equipped with several arms (22b) supporting the said sheath, an annular space (40) being provided between the said arms and an end part (17) of the said sleeve (15) forming bearing (20).
EP99420128A 1998-06-05 1999-06-04 Magnetic drive agitator Revoked EP0962249B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9807259A FR2779361B1 (en) 1998-06-05 1998-06-05 MAGNETICALLY DRIVEN AGITATOR
FR9807259 1998-06-05

Publications (2)

Publication Number Publication Date
EP0962249A1 EP0962249A1 (en) 1999-12-08
EP0962249B1 true EP0962249B1 (en) 2003-01-02

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EP99420128A Revoked EP0962249B1 (en) 1998-06-05 1999-06-04 Magnetic drive agitator

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US (1) US6065865A (en)
EP (1) EP0962249B1 (en)
CA (1) CA2273677C (en)
DE (1) DE69904673T2 (en)
ES (1) ES2187129T3 (en)
FR (1) FR2779361B1 (en)

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Also Published As

Publication number Publication date
FR2779361B1 (en) 2000-07-28
CA2273677A1 (en) 1999-12-05
US6065865A (en) 2000-05-23
CA2273677C (en) 2008-07-29
EP0962249A1 (en) 1999-12-08
DE69904673D1 (en) 2003-02-06
DE69904673T2 (en) 2003-10-16
ES2187129T3 (en) 2003-05-16
FR2779361A1 (en) 1999-12-10

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