EP2286907A1 - Device for agitating a liquid medium - Google Patents

Device for agitating a liquid medium Download PDF

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Publication number
EP2286907A1
EP2286907A1 EP10305883A EP10305883A EP2286907A1 EP 2286907 A1 EP2286907 A1 EP 2286907A1 EP 10305883 A EP10305883 A EP 10305883A EP 10305883 A EP10305883 A EP 10305883A EP 2286907 A1 EP2286907 A1 EP 2286907A1
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EP
European Patent Office
Prior art keywords
container
magnetic
magnetic element
magnets
liquid medium
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.)
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Application number
EP10305883A
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German (de)
French (fr)
Inventor
Patrice Grayel
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Individual
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Individual
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Publication of EP2286907A1 publication Critical patent/EP2286907A1/en
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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
    • B01F27/808—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with stirrers driven from the bottom of the receptacle
    • 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
    • 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
    • B01F33/4532—Magnetic mixers; Mixers with magnetically driven stirrers using supported or suspended stirring elements using a bearing, tube, opening or gap for internally supporting the stirring element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/20—Measuring; Control or regulation
    • B01F35/21—Measuring
    • B01F35/212—Measuring of the driving system data, e.g. torque, speed or power data
    • 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
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/113—Propeller-shaped stirrers for producing an axial flow, e.g. shaped like a ship or aircraft propeller
    • 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
    • B01F33/50—Movable or transportable mixing devices or plants
    • B01F33/501—Movable mixing devices, i.e. readily shifted or displaced from one place to another, e.g. portable during use

Definitions

  • the invention relates to the field of agitation of a liquid medium, more particularly in the context of large containers, typically greater than 100 liters. It relates in particular to the agitation of such a liquid medium by rotating an element provided with magnetic properties.
  • the invention is more particularly applicable in the field of pharmacy, agri-food, chemistry and the nuclear industry.
  • magnetic stirrers are widely known. For example, it has been described in the document FR 2 336 052 such a magnetic stirrer.
  • This is basically constituted by a magnetic body of cylindrical general shape, provided with at least one permanent magnet oriented so as to have at least two opposite magnetic poles on either side of its axis of geometric rotation.
  • This magnetic body is subjected to the action of a rotating magnetic field applied from outside the non-magnetic container receiving the liquid medium to be agitated, inducing the rotation of said magnetic body.
  • the first difficulty lies in the lack of certainty as to the actual implementation of the agitation.
  • the tanks in question are generally non-transparent, so that firstly it is not certain that the agitation occurs, notwithstanding the activation of an outer plate generating the rotating magnetic field intended to ensure the rotation of the magnetic bar contained in the tank.
  • this agitation has started, it is not certain that it will continue under the expected operational conditions, since it is not uncommon, either because of the large mass of liquid to be agitated or because of its relatively high viscosity, that the bar or magnetic stirrer "picks up" of the rotary torque to which it is subjected by the plate placed outside the tank and in particular under its bottom and intended to ensure its rotation.
  • these tanks of large capacity generally cylindrical, have a relatively large diameter bottom so that, despite all the care taken in positioning the platen generating the rotating magnetic field, substantially in the center of said vessel, the operator It is never certain that said plate will actually cooperate with the magnetic bar located in the tank, so that in the negative case, no agitation occurs.
  • the object of the present invention is to provide a device for stirring a liquid medium for high capacity tanks overcoming these various disadvantages.
  • the invention is directed to a device capable of agitating a liquid medium contained in a container.
  • This device comprises a movable magnetic element, intended to be positioned in the vicinity of the bottom of the container receiving a liquid medium to be agitated, in addition to a plate provided with a magnetic rotating member, intended to be positioned under said container, and whose rotation ensures that of the magnetic element under the effect of the rotating magnetic field that it generates.
  • the motor is regulated by means of a variator, able to ensure a progression of the speed of rotation according to any desired type, and consequently a deceleration of said speed.
  • the movable magnetic element intended to be immersed in the container receiving the liquid to be agitated is mounted on a substantially vertical axis mounted free to rotate on a base secured to the bottom of the container, and in particular in the center. said container.
  • the securing of the base to the bottom of the container is advantageously reversible, this reversibility being obtained in particular by magnetic interaction, said base being provided for this purpose with a permanent magnet cooperating with a permanent magnet of opposite polarity, secured at the bottom of the container and outside thereof substantially in a central position.
  • the magnet permanent report under the bottom of the container can be either by construction or by gluing.
  • the positioning of the base receiving the axis provided with the rotating magnetic element is substantially centered, thus enabling, as previously said, effective and efficient cooperation of the rotary member with the magnetic element.
  • the invention consists first and foremost in providing two magnetic members intended to interact with each other, respectively a movable magnetic element, immersed in the container receiving the liquid to be agitated, and a rotary member outside said container, and secondly to provide opposite polarities in pairs in contrast to all that was known from the prior art where classically, the polarities of each of the magnetic members, respectively of the magnetic element immersed in the vessel and the rotating magnetic member outside the tank had opposite polarities.
  • the stirring device basically consists of two parts, respectively a magnetic mobile element (2) intended to be immersed in the tank (1), and a plate (4) intended for its part to be positioned under said tank as can be seen well on the figure 1 .
  • Said magnetic element (2) has been shown in more detail within the figures 2 , 3 and 4 . It basically consists of a rotary shaft (9) rotating about a vertical axis and resting on an axial base (5) secured to the inner face of the bottom (3) of said vessel. This solidarity is in this case reversible. It is ensured by the magnetic cooperation between a permanent magnet (6) forming an integral part of the bottom of the base (5) and another permanent magnet (20), reported under the bottom of the tank for example by gluing. The respective polarities of the magnets (6, 20) are opposed to ensure this magnetic interaction.
  • the base (5) rests on the bottom of the tank not only via the magnet (6), but also by pads (8) formed on either side of the magnet (6) pads typically made of polytetrafluoroethylene (TEFLON ® ) to prevent scratching of the bottom of the tank.
  • TEFLON ® polytetrafluoroethylene
  • the rotary shaft (9) is received on the axial base (5) at two separate bearings, respectively upper (10) and lower (11), advantageously made of PEEK (Polyetheretherketone), in other words in a plastic with a low coefficient of friction and resistant to wear.
  • the bearings (10, 11) promote the free rotation of the shaft (9) about the axis (5).
  • the shaft (9) extends in the lower part by two arms or radial extensions (12) extending substantially perpendicular to the direction of the shaft (9), and at the end of which, permanent magnets (13) , 14) are mounted.
  • the permanent magnets (13, 14) have their polarity oriented in the same direction. In this case, their north face is directed towards the bottom of the tank and corollarily their south face is directed in the opposite direction.
  • the axis (5) receives in the upper part a ring (16), screwable (17), allowing by any suitable means such as a rod, particularly retractable, to lower the element ( 2) at the bottom of the tank although it is already filled, the precise positioning of the element (2) on the bottom being provided by the cooperation of the magnets (6, 20).
  • the element (2) can receive in addition to the rotary bar constituted by the extensions (12) and the magnets (13, 14), one or more fins (15) having different orientations depending on the stirring effect and the desired intensity of agitation. These fins are better represented within Figures 3 and 4 .
  • the underlying plate (4) basically comprises a rotary member (21), whose rotation is provided by a conventional electric motor and possibly by means of a gearbox.
  • the polarity of the magnets (22, 23) is oriented identically for these two magnets, and exactly opposite that of the permanent magnets (13, 14).
  • the south face of the magnets (22, 23) is directed towards the tank, while the north face is directed downwards on the figure 1 .
  • This particular configuration makes it possible to promote the centering of the magnetic element within the vessel.
  • the drive shaft of the plate (4) is provided with sensors adapted to measure the torque exerted on the rotary member (21).
  • a blocking device also referred to as a blocking hand.
  • this device is intended to be implemented during the transport and / or storage phases of the container or tank (1).
  • the objective is to impart immobility to the magnetic mobile element (2) immersed in the tank. Moreover, it also aims to block the magnetic element (2) at the bottom of the tank, in case of fall of the latter.
  • this device comprises two magnets or two sets of magnets (24, 25), mounted on a support (28).
  • the distance separating these two magnets or these two series of magnets corresponds substantially to the distance separating the two magnets (13, 14) of the magnetic mobile element (2).
  • This device comes into contact with the outer face of the bottom (3) of the tank (1).
  • the magnetic intensity is modulated by the implementation of one or more magnets, hence the use of the term "series of magnets". This is also true for the magnetic element (2) and the plate (4).
  • the polarity of the magnets (24, 25) in the direction of the tank (1) is opposite to that of the magnets (13, 14) of the movable magnetic element directed toward the bottom of the vessel. In doing so, regardless of the position of the magnets (13, 14), they are always likely to come into magnetic interaction with this locking device thus defined, so that said magnetic mobile element is found somehow blocked once the support (28) mounted near the bottom (3) of the tank (1), preventing any risk of retraction of the shaft (9) from the base (5).
  • the support (28) is mounted near the bottom (3) of the tank by means of a frame (26) adjustable in height (27).

Abstract

The device has a magnetic element (2) positioned near a base of a container (1). A plate (4) comprises a magnetic rotating unit positioned under the container. An electric motor assures rotation of the rotating unit, and is equipped with sensors for measuring the torque exerted on the rotating unit. The plate is provided with adapted electronics and software for reducing the rotation speed of the rotating unit based on the sensor measurement to avoid the risk of dissociation of the magnetic interaction between the rotating unit and the magnetic element.

Description

DOMAINE TECHNIQUETECHNICAL AREA

L'invention se rattache au domaine de l'agitation d'un milieu liquide, plus particulièrement dans le cadre de récipients de grande dimension, typiquement supérieur à 100 litres. Elle concerne notamment l'agitation d'un tel milieu liquide par rotation d'un élément pourvu de propriétés magnétiques.The invention relates to the field of agitation of a liquid medium, more particularly in the context of large containers, typically greater than 100 liters. It relates in particular to the agitation of such a liquid medium by rotating an element provided with magnetic properties.

L'invention trouve plus particulièrement son application dans le domaine de la pharmacie, de l'agroalimentaire, de la chimie et de l'industrie nucléaire.The invention is more particularly applicable in the field of pharmacy, agri-food, chemistry and the nuclear industry.

ETAT DE LA TECHNIQUE.STATE OF THE ART.

La mise en oeuvre d'agitateurs magnétiques est largement connue. On a par exemple décrit dans le document FR 2 336 052 un tel agitateur magnétique. Celui-ci est fondamentalement constitué d'un corps magnétique de forme générale cylindrique, muni d'au moins un aimant permanent orienté de telle sorte à présenter au moins deux pôles magnétiques opposés de part et d'autre de son axe de rotation géométrique. Ce corps magnétique est soumis à l'action d'un champ magnétique rotatif appliqué depuis l'extérieur du récipient non magnétique recevant le milieu liquide à agiter, induisant la rotation dudit corps magnétique.The use of magnetic stirrers is widely known. For example, it has been described in the document FR 2 336 052 such a magnetic stirrer. This is basically constituted by a magnetic body of cylindrical general shape, provided with at least one permanent magnet oriented so as to have at least two opposite magnetic poles on either side of its axis of geometric rotation. This magnetic body is subjected to the action of a rotating magnetic field applied from outside the non-magnetic container receiving the liquid medium to be agitated, inducing the rotation of said magnetic body.

L'expérience démontre que la mise en oeuvre de tels agitateurs magnétiques s'avère satisfaisante pour des récipients de faible capacité, typiquement inférieurs à 100 litres en fonction de la viscosité du milieu liquide à mélanger. En revanche, dès lors que l'on souhaite procéder à l'agitation de volumes importants, on se heurte à plusieurs difficultés.Experience shows that the use of such magnetic stirrers is satisfactory for containers of low capacity, typically less than 100 liters depending on the viscosity of the liquid medium to be mixed. On the other hand, when one wishes to proceed with the agitation of large volumes, one encounters several difficulties.

La première difficulté réside dans l'absence de certitude quant à la mise en oeuvre effective de l'agitation. En effet, les cuves en question sont généralement non transparentes, de sorte que de première part on n'est pas certain que l'agitation intervienne, nonobstant l'activation d'une platine extérieure générant le champ magnétique tournant destiné à assurer la rotation du barreau magnétique contenu dans la cuve. De plus, à supposer que cette agitation ait démarré, on n'est pas certain qu'elle se poursuive dans les conditions opérationnelles prévues, puisqu'il n'est pas rare, soit en raison de la masse importante de liquide à agiter, soit en raison de sa viscosité relativement élevée, que le barreau ou agitateur magnétique « décroche » du couple rotatif auquel il est soumis de par la platine placée à l'extérieur de la cuve et notamment sous son fond et destinée à assurer sa rotation.The first difficulty lies in the lack of certainty as to the actual implementation of the agitation. In fact, the tanks in question are generally non-transparent, so that firstly it is not certain that the agitation occurs, notwithstanding the activation of an outer plate generating the rotating magnetic field intended to ensure the rotation of the magnetic bar contained in the tank. In addition, assuming that this agitation has started, it is not certain that it will continue under the expected operational conditions, since it is not uncommon, either because of the large mass of liquid to be agitated or because of its relatively high viscosity, that the bar or magnetic stirrer "picks up" of the rotary torque to which it is subjected by the plate placed outside the tank and in particular under its bottom and intended to ensure its rotation.

Au surplus, ces cuves de grande capacité, généralement cylindriques, présentent un fond de diamètre relativement important de sorte que, malgré tout le soin apporté au positionnement de la platine générant le champ magnétique rotatif, sensiblement au centre de ladite cuve, l'opérateur n'est jamais assuré que ladite platine va effectivement coopérer avec le barreau magnétique situé dans la cuve, de sorte que dans l'hypothèse négative, aucune agitation n'intervient.In addition, these tanks of large capacity, generally cylindrical, have a relatively large diameter bottom so that, despite all the care taken in positioning the platen generating the rotating magnetic field, substantially in the center of said vessel, the operator It is never certain that said plate will actually cooperate with the magnetic bar located in the tank, so that in the negative case, no agitation occurs.

Enfin, le besoin existe de procéder au transport et/ou au stockage de telles cuves. Or, avec les dispositifs d'agitation de l'état antérieur de la technique, il n'est pas possible d'immobiliser l'élément mobile au sein de la cuve, de sorte que son replacement en positionnement opérationnelle lors de la stabilisation de la cuve est des plus aléatoire.Finally, there is a need to transport and / or store such tanks. However, with the stirring devices of the prior art, it is not possible to immobilize the mobile element within the vessel, so that its replacement in operational positioning during the stabilization of the tank is more random.

L'objectif de la présente invention est de proposer un dispositif d'agitation d'un milieu liquide pour des cuves de grande capacité s'affranchissant de ces différents inconvénients.The object of the present invention is to provide a device for stirring a liquid medium for high capacity tanks overcoming these various disadvantages.

EXPOSE DE L'INVENTIONSUMMARY OF THE INVENTION

A cet effet, l'invention vise un dispositif apte à réaliser l'agitation d'un milieu liquide contenu dans un récipient. Ce dispositif comprend un élément magnétique mobile, destiné à être positionné au voisinage du fond du récipient recevant un milieu liquide à agiter, outre une platine pourvue d'un organe rotatif magnétique, destiné à être positionné sous ledit récipient, et dont la rotation assure celle de l'élément magnétique sous l'effet du champ magnétique rotatif qu'il génère.For this purpose, the invention is directed to a device capable of agitating a liquid medium contained in a container. This device comprises a movable magnetic element, intended to be positioned in the vicinity of the bottom of the container receiving a liquid medium to be agitated, in addition to a plate provided with a magnetic rotating member, intended to be positioned under said container, and whose rotation ensures that of the magnetic element under the effect of the rotating magnetic field that it generates.

Selon l'invention :

  • les deux extrémités de cet élément magnétique mobile sont pourvues chacune d'un aimant, dont la polarité dirigée vers le fond de la cuve est identique ;
  • l'organe magnétique rotatif de la platine comporte deux aimants diamétralement opposés, dont l'espace les séparant correspond sensiblement à l'espace séparant les deux aimants de l'élément magnétique mobile, et dont la polarité dirigée vers le récipient est identique et opposée à celle des aimants de l'élément magnétique dirigée vers le fond du récipient.
  • la rotation de l'organe rotatif magnétique de la platine est assurée par un moteur électrique, muni de capteurs aptes à mesurer le couple exercé sur l'organe rotatif.
  • la platine est munie d'une électronique et d'un logiciel adaptés, aptes en fonction de la mesure des capteurs, à réduire la vitesse de rotation de l'organe rotatif, et ainsi éviter le risque de décrochage de l'interaction magnétique entre l'organe rotatif et l'élément magnétique.
According to the invention:
  • both ends of this movable magnetic element are each provided with a magnet, whose polarity directed towards the bottom of the tank is identical;
  • the rotary magnetic member of the plate comprises two diametrically opposed magnets, the space between them substantially corresponds to the space between the two magnets of the movable magnetic element, and whose polarity directed towards the container is identical and opposite to that of the magnets of the magnetic element directed towards the bottom of the container.
  • the rotation of the magnetic rotary member of the plate is provided by an electric motor, provided with sensors able to measure the torque exerted on the rotary member.
  • the plate is provided with an electronics and a software adapted, according to the measurement of the sensors, to reduce the speed of rotation of the rotary member, and thus to avoid the risk of stalling the magnetic interaction between the rotating member and the magnetic element.

Ce faisant, en fonction de la nature du milieu liquide à agiter et de la vitesse de rotation, il devient ainsi possible de régler, et notamment de réduire la vitesse limite au-delà de laquelle on ne doit pas aller pour éviter le risque de décrochage de l'interaction magnétique entre l'organe rotatif et l'élément magnétique, et donc s'assurer d'une permanence de l'agitation. Au demeurant, le moteur est régulé au moyen d'un variateur, apte à assurer une progression de la vitesse de rotation selon tout type souhaité, et corollairement une décélération de ladite vitesse.In doing so, depending on the nature of the liquid medium to be agitated and the speed of rotation, it becomes possible to adjust, and in particular to reduce the speed limit beyond which we must not go to avoid the risk of stalling the magnetic interaction between the rotary member and the magnetic element, and thus ensure a permanent stirring. Moreover, the motor is regulated by means of a variator, able to ensure a progression of the speed of rotation according to any desired type, and consequently a deceleration of said speed.

Selon une caractéristique avantageuse de l'invention, l'élément magnétique mobile destiné à être plongé dans le récipient recevant le liquide à agiter est monté sur un axe sensiblement vertical monté libre en rotation sur une base solidarisée au fond du récipient, et notamment au centre dudit récipient.According to an advantageous characteristic of the invention, the movable magnetic element intended to be immersed in the container receiving the liquid to be agitated is mounted on a substantially vertical axis mounted free to rotate on a base secured to the bottom of the container, and in particular in the center. said container.

Ce faisant, on s'affranchit de tout risque de déplacement dudit élément magnétique par rapport au fond du récipient hors de la zone où il est réputé coopérer avec l'organe générant un champ magnétique tournant assurant la rotation effective par interaction magnétique dudit élément mobile, et, corollairement, on évite le risque d'absence d'agitation.In doing so, there is no risk of displacement of said magnetic element relative to the bottom of the container outside the zone where it is deemed to cooperate with the member generating a rotating magnetic field ensuring the effective rotation by magnetic interaction of said movable member, and, as a corollary, the risk of absence of agitation is avoided.

Selon cette caractéristique, la solidarisation de la base au fond du récipient est avantageusement réversible, cette réversibilité étant notamment obtenue également par interaction magnétique, ladite base étant munie à cet effet d'un aimant permanent venant coopérer avec un aimant permanent de polarité opposé, solidarisé au fond du récipient et à l'extérieur de celui-ci sensiblement en position centrale. L'aimant permanent rapporté sous le fond du récipient peut l'être soit par construction, soit par collage.According to this characteristic, the securing of the base to the bottom of the container is advantageously reversible, this reversibility being obtained in particular by magnetic interaction, said base being provided for this purpose with a permanent magnet cooperating with a permanent magnet of opposite polarity, secured at the bottom of the container and outside thereof substantially in a central position. The magnet permanent report under the bottom of the container can be either by construction or by gluing.

Ce faisant, le positionnement de la base recevant l'axe muni de l'élément magnétique rotatif est sensiblement centré, permettant ainsi, comme dit précédemment, d'assurer la coopération effective et efficace de l'organe rotatif avec l'élément magnétique.In doing so, the positioning of the base receiving the axis provided with the rotating magnetic element is substantially centered, thus enabling, as previously said, effective and efficient cooperation of the rotary member with the magnetic element.

En d'autres termes, l'invention consiste en premier lieu à prévoir deux organes magnétiques destinés à interagir entre eux, respectivement un élément magnétique mobile, plongé dans le récipient recevant le liquide à agiter, et un organe rotatif extérieur audit récipient, et en second lieu à ménager les polarités opposées deux à deux contrairement à tout ce qui était connu de l'art antérieur où classiquement, les polarités de chacun des organes magnétiques, respectivement de l'élément magnétique plongé dans la cuve et de l'organe magnétique rotatif extérieur de la cuve avait des polarités opposées.In other words, the invention consists first and foremost in providing two magnetic members intended to interact with each other, respectively a movable magnetic element, immersed in the container receiving the liquid to be agitated, and a rotary member outside said container, and secondly to provide opposite polarities in pairs in contrast to all that was known from the prior art where classically, the polarities of each of the magnetic members, respectively of the magnetic element immersed in the vessel and the rotating magnetic member outside the tank had opposite polarities.

BREVE DESCRIPTION DES FIGURESBRIEF DESCRIPTION OF THE FIGURES

La manière dont l'invention peut être réalisée et les avantages qui en découlent ressortiront mieux de l'exemple de réalisation qui suit, donné à titre indicatif et non limitatif à l'appui des figures annexées.

  • La figure 1 est une représentation schématique illustrant le dispositif d'agitation conforme à l'invention en position relativement à une cuve recevant un milieu liquide à agiter.
  • La figure 2 est une vue de détail de l'élément mobile magnétique destiné à être immergé dans ladite cuve.
  • La figure 3 est une vue analogue à la figure 2 illustrant ledit élément muni d'une ailette d'agitation.
  • La figure 4 est une vue du dessus de l'élément illustré sur la figure 3.
  • La figure 5 est une représentation schématique en section, illustrant le dispositif de blocage de l'élément mobile magnétique lors des opérations de stockage et/ou de transfert du récipient recevant le liquide à agiter.
The manner in which the invention can be realized and the advantages which result therefrom will emerge more clearly from the exemplary embodiment which follows, given by way of indication and not limitation, in support of the appended figures.
  • The figure 1 is a schematic representation illustrating the stirring device according to the invention in position relative to a tank receiving a liquid medium to be agitated.
  • The figure 2 is a detail view of the magnetic mobile element intended to be immersed in said tank.
  • The figure 3 is a view similar to the figure 2 illustrating said element provided with a stirring vane.
  • The figure 4 is a top view of the element shown on the figure 3 .
  • The figure 5 is a schematic representation in section, illustrating the locking device of the magnetic mobile element during storage and / or transfer operations of the container receiving the liquid to be agitated.

DESCRIPTION DETAILLEE DE L'INVENTIONDETAILED DESCRIPTION OF THE INVENTION

On a donc schématisé sur la figure 1 le dispositif d'agitation magnétique conforme à l'invention mise en place en relation avec une cuve (1) contenant un liquide à agiter. Comme on peut l'observer, cette cuve présente un fond (3) de diamètre relativement important, et en partie plan.So we have schematised on the figure 1 the magnetic stirring device according to the invention placed in connection with a tank (1) containing a liquid to be stirred. As can be seen, this vessel has a bottom (3) of relatively large diameter, and partly flat.

Selon l'invention, le dispositif d'agitation est fondamentalement constitué de deux parties, respectivement un élément mobile magnétique (2), destiné à être immergé dans la cuve (1), et une platine (4) destinée quant à elle à être positionnée sous ladite cuve ainsi qu'on le voit bien sur la figure 1.According to the invention, the stirring device basically consists of two parts, respectively a magnetic mobile element (2) intended to be immersed in the tank (1), and a plate (4) intended for its part to be positioned under said tank as can be seen well on the figure 1 .

Ledit élément magnétique (2) a été représenté plus en détail au sein des figures 2, 3 et 4. Il est fondamentalement constitué d'un arbre rotatif (9) tournant autour d'un axe vertical et reposant sur une base axiale (5) solidarisée sur la face interne du fond (3) de ladite cuve. Cette solidarisation est en l'espèce réversible. Elle est assurée par la coopération magnétique entre un aimant permanent (6) faisant partie intégrante du fond de la base (5) et par un autre aimant permanent (20), rapporté sous le fond de la cuve par exemple par collage. Les polarités respectives des aimants (6, 20) sont opposés pour assurer cette interaction magnétique.Said magnetic element (2) has been shown in more detail within the figures 2 , 3 and 4 . It basically consists of a rotary shaft (9) rotating about a vertical axis and resting on an axial base (5) secured to the inner face of the bottom (3) of said vessel. This solidarity is in this case reversible. It is ensured by the magnetic cooperation between a permanent magnet (6) forming an integral part of the bottom of the base (5) and another permanent magnet (20), reported under the bottom of the tank for example by gluing. The respective polarities of the magnets (6, 20) are opposed to ensure this magnetic interaction.

Parallèlement, la base (5) repose sur le fond de la cuve non seulement par l'intermédiaire de l'aimant (6), mais également par des patins (8) ménagés de part et d'autre de l'aimant (6), patins typiquement réalisés en polytétrafluoroéthylène (TEFLON®) afin d'éviter toute rayure du fond de la cuve.Meanwhile, the base (5) rests on the bottom of the tank not only via the magnet (6), but also by pads (8) formed on either side of the magnet (6) pads typically made of polytetrafluoroethylene (TEFLON ® ) to prevent scratching of the bottom of the tank.

Corollairement, l'arbre rotatif (9) est reçu sur la base axiale (5) au niveau de deux paliers séparés, respectivement supérieur (10) et inférieur (11), avantageusement réalisés en PEEK (Polyétherethercétone), en d'autres termes en une matière plastique de faible coefficient de frottement et résistante à l'usure. Ce faisant, les paliers (10, 11) favorisent la libre rotation de l'arbre (9) autour de l'axe (5).As a corollary, the rotary shaft (9) is received on the axial base (5) at two separate bearings, respectively upper (10) and lower (11), advantageously made of PEEK (Polyetheretherketone), in other words in a plastic with a low coefficient of friction and resistant to wear. In doing so, the bearings (10, 11) promote the free rotation of the shaft (9) about the axis (5).

L'arbre (9) se prolonge en partie inférieure par deux bras ou extensions radiales (12) s'étendant sensiblement perpendiculairement par rapport à la direction de l'arbre (9), et à l'extrémité desquels, des aimants permanents (13, 14) sont montés.The shaft (9) extends in the lower part by two arms or radial extensions (12) extending substantially perpendicular to the direction of the shaft (9), and at the end of which, permanent magnets (13) , 14) are mounted.

Selon une première caractéristique de l'invention, les aimants permanents (13, 14) ont leur polarité orientée dans le même sens. En l'espèce, leur face nord est dirigée vers le fond de la cuve et corollairement leur face sud est dirigée selon la direction opposée.According to a first characteristic of the invention, the permanent magnets (13, 14) have their polarity oriented in the same direction. In this case, their north face is directed towards the bottom of the tank and corollarily their south face is directed in the opposite direction.

Selon une caractéristique avantageuse de l'invention, l'axe (5) reçoit en partie supérieure un anneau (16), vissable (17), permettant par tout moyen approprié telle qu'une tige, notamment escamotable, de descendre l'élément (2) au fond de la cuve bien que celle-ci soit d'ores et déjà remplie, le positionnement précis de l'élément (2) sur le fond étant assuré par la coopération des aimants (6, 20).According to an advantageous characteristic of the invention, the axis (5) receives in the upper part a ring (16), screwable (17), allowing by any suitable means such as a rod, particularly retractable, to lower the element ( 2) at the bottom of the tank although it is already filled, the precise positioning of the element (2) on the bottom being provided by the cooperation of the magnets (6, 20).

Ce faisant, la base (5) et l'arbre (9) sont immergés simultanément dans la cuve (1).In doing so, the base (5) and the shaft (9) are immersed simultaneously in the tank (1).

L'élément (2) peut recevoir outre le barreau rotatif constitué par les extensions (12) et les aimants (13, 14), une ou plusieurs ailettes (15) présentant différentes orientations en fonction de l'effet d'agitation et de l'intensité d'agitation recherchés. Ces ailettes sont mieux représentées au sein des figures 3 et 4.The element (2) can receive in addition to the rotary bar constituted by the extensions (12) and the magnets (13, 14), one or more fins (15) having different orientations depending on the stirring effect and the desired intensity of agitation. These fins are better represented within Figures 3 and 4 .

Corollairement, la platine sous-jacente (4) comporte fondamentalement un organe rotatif (21), dont la rotation est assurée par un moteur électrique de facture classique et éventuellement par l'intermédiaire d'un réducteur.As a corollary, the underlying plate (4) basically comprises a rotary member (21), whose rotation is provided by a conventional electric motor and possibly by means of a gearbox.

Sur cet organe rotatif (21) sont montés deux aimants (22, 23), diamétralement opposés l'un par rapport à l'autre, destinés à être positionnés sensiblement à l'aplomb des aimants permanents (13, 14) de l'élément magnétique (2).On this rotary member (21) are mounted two magnets (22, 23), diametrically opposite one another, intended to be positioned substantially in line with the permanent magnets (13, 14) of the element magnetic (2).

Selon une caractéristique essentielle de l'invention, la polarité des aimants (22, 23) est orientée de manière identique pour ces deux aimants, et exactement opposée à celle des aimants permanents (13, 14). En d'autres termes et dans l'exemple d'écrit, la face sud des aimants (22, 23) est dirigée en direction de la cuve, alors que la face nord est dirigée vers le bas sur la figure 1.According to an essential characteristic of the invention, the polarity of the magnets (22, 23) is oriented identically for these two magnets, and exactly opposite that of the permanent magnets (13, 14). In other words and in the example of writing, the south face of the magnets (22, 23) is directed towards the tank, while the north face is directed downwards on the figure 1 .

Cette configuration particulière permet de favoriser le centrage de l'élément magnétique au sein de la cuve.This particular configuration makes it possible to promote the centering of the magnetic element within the vessel.

Selon une autre caractéristique de l'invention, l'arbre moteur de la platine (4) est muni de capteurs propres à mesurer le couple s'exerçant sur l'organe rotatif (21). Ce faisant, avec une électronique et un logiciel appropriés, il est possible de déterminer le moment où le couple résistif devient trop important, et corollairement la limite de décrochage de la coopération magnétique entre l'organe rotatif (21) et l'élément magnétique (2) pour éviter justement ce risque de décrochage et conserver l'agitation au sein de la cuve (1).According to another characteristic of the invention, the drive shaft of the plate (4) is provided with sensors adapted to measure the torque exerted on the rotary member (21). By doing this, with appropriate electronics and software, it is possible to determine the moment when the resistive torque becomes too great, and consequently the stall limit of the magnetic cooperation between the rotary member (21) and the magnetic element ( 2) to avoid this risk of stall and maintain agitation in the tank (1).

Il doit en effet être rappelé que le plus souvent, l'opérateur travaille « en aveugle », et ne peut dès lors pas visualiser l'agitation effective au sein de la cuve. Avec les caractéristiques précitées, il peut instantanément être informé du « décrochement » de l'élément magnétique par rapport à la rotation de l'organe rotatif.It must be remembered that most often, the operator works "blind", and therefore can not visualize the actual agitation within the tank. With the aforementioned characteristics, it can instantly be informed of the "recess" of the magnetic element relative to the rotation of the rotary member.

On a représenté en relation avec la figure 5 un dispositif de blocage, également dénommé main de blocage.We have shown in relation to the figure 5 a blocking device, also referred to as a blocking hand.

Comme déjà indiqué, ce dispositif a vocation à être mis en oeuvre pendant les phases de transport et/ou de stockage du récipient ou de la cuve (1). L'objectif visé est de conférer l'immobilité à l'élément mobile magnétique (2) immergé dans la cuve. Au demeurant, il a également vocation à bloquer l'élément magnétique (2) au fond de la cuve, en cas de chute de cette dernière.As already indicated, this device is intended to be implemented during the transport and / or storage phases of the container or tank (1). The objective is to impart immobility to the magnetic mobile element (2) immersed in the tank. Moreover, it also aims to block the magnetic element (2) at the bottom of the tank, in case of fall of the latter.

A cet effet, ce dispositif comporte deux aimants ou deux séries d'aimants (24, 25), montés sur un support (28). La distance séparant ces deux aimants ou ces deux séries d'aimants correspond sensiblement à la distance séparant les deux aimants (13, 14) de l'élément mobile magnétique (2). Ce dispositif vient en contact avec la face externe du fond (3) de la cuve (1).For this purpose, this device comprises two magnets or two sets of magnets (24, 25), mounted on a support (28). The distance separating these two magnets or these two series of magnets corresponds substantially to the distance separating the two magnets (13, 14) of the magnetic mobile element (2). This device comes into contact with the outer face of the bottom (3) of the tank (1).

L'intensité magnétique est modulée par la mise en oeuvre de un ou de plusieurs aimants, d'où l'utilisation du terme « série d'aimants ». C'est d'ailleurs également vrai pour l'élément magnétique (2) et pour la platine (4).The magnetic intensity is modulated by the implementation of one or more magnets, hence the use of the term "series of magnets". This is also true for the magnetic element (2) and the plate (4).

La polarité des aimants (24, 25) en direction de la cuve (1) est opposée à celle des aimants (13, 14) de l'élément magnétique mobile dirigée en direction du fond du récipient. Ce faisant, quelle que soit la position des aimants (13, 14), ils sont toujours susceptibles d'entrer en interaction magnétique avec ce dispositif de blocage ainsi défini, de sorte que ledit élément mobile magnétique se retrouve en quelque sorte bloqué une fois le support (28) monté à proximité du fond (3) de la cuve (1), interdisant tout risque d'escamotage de l'arbre (9) hors de la base (5).The polarity of the magnets (24, 25) in the direction of the tank (1) is opposite to that of the magnets (13, 14) of the movable magnetic element directed toward the bottom of the vessel. In doing so, regardless of the position of the magnets (13, 14), they are always likely to come into magnetic interaction with this locking device thus defined, so that said magnetic mobile element is found somehow blocked once the support (28) mounted near the bottom (3) of the tank (1), preventing any risk of retraction of the shaft (9) from the base (5).

Le support (28) est monté à proximité du fond (3) de la cuve au moyen d'un châssis (26) réglable en hauteur (27).The support (28) is mounted near the bottom (3) of the tank by means of a frame (26) adjustable in height (27).

En raison du blocage ainsi opéré, et comme déjà dit, il n'y a plus risque de désolidarisation ou d'escamotage de l'arbre (9) portant les aimants (13, 14) hors de l'axe (5).Due to the blockage thus made, and as already said, there is no longer risk of separation or retraction of the shaft (9) carrying the magnets (13, 14) out of the axis (5).

Corollairement, on s'affranchit des chocs susceptibles d'intervenir entre ces deux pièces. De fait, les paliers (10, 11) en PEEK, voire en un autre matériau équivalent, type carbure ou céramique ne risquent plus d'être endommagés.As a corollary, one gets rid of shocks likely to intervene between these two parts. In fact, the bearings (10, 11) of PEEK, or even another equivalent material, carbide or ceramic type are no longer likely to be damaged.

On conçoit tout l'intérêt du dispositif de l'invention qui permet, à l'aide de moyens simples à réaliser et à mettre en oeuvre, d'assurer l'agitation de cuves de grandes capacités, ce que l'on ne savait faire efficacement à ce jour, outre leur transport et leur stockage, sans risquer le déplacement intempestif de l'élément mobile magnétique.It is conceivable the whole point of the device of the invention which makes it possible, by means of simple means to realize and to implement, to ensure the stirring of tanks of large capacities, which we did not know how to do. effectively to date, in addition to their transport and storage, without risking inadvertent movement of the magnetic mobile element.

Claims (4)

Dispositif pour réaliser l'agitation d'un milieu liquide contenu dans un récipient (1) comprenant : - un élément magnétique destiné à être positionné au voisinage du fond du récipient (1), dont les deux extrémités de cet élément magnétique mobile sont pourvues chacune d'un aimant (13, 14), dont la polarité dirigée vers le fond dudit récipient est identique, - et une platine (4) pourvue d'un organe rotatif magnétique (21 22, 23), destiné à être positionné sous ledit récipient, et dont la rotation assure celle de l'élément magnétique (2) sous l'effet du champ magnétique rotatif qu'il génère, ledit organe magnétique rotatif (21, 22, 23) de la platine (4) comportant deux aimants diamétralement opposés (22, 23), dont l'espace les séparant correspond sensiblement à l'espace séparant les deux aimants (13, 14) de l'élément magnétique (2), et dont la polarité dirigée vers le récipient est identique et opposée à celle des aimants de l'élément magnétique dirigée vers le fond du récipient ;
caractérisé - et en ce que la rotation de l'organe rotatif magnétique (21) de la platine (4) est assurée par un moteur électrique, muni de capteurs aptes à mesurer le couple exercé sur l'organe rotatif (21) ; - et en ce que la platine (4) est munie d'une électronique et d'un logiciel adaptés, aptes en fonction de la mesure des capteurs, à réduire la vitesse de rotation de l'organe rotatif (21), et ainsi éviter le risque de décrochage de l'interaction magnétique entre l'organe rotatif et l'élément magnétique (2). Device for agitating a liquid medium contained in a container (1) comprising: a magnetic element intended to be positioned in the vicinity of the bottom of the container (1), the two ends of which of this movable magnetic element are each provided with a magnet (13, 14) whose polarity directed towards the bottom of said container is identical, - and a plate (4) provided with a magnetic rotating member (21 22, 23) intended to be positioned under said container, and whose rotation ensures that of the magnetic element (2) under the effect of the magnetic field it generates, said rotating magnetic member (21, 22, 23) of the plate (4) having two diametrically opposed magnets (22, 23), the space between them substantially corresponds to the space between the two magnets (13, 14) of the magnetic element (2), and whose polarity directed towards the container is identical and opposite to that of the magnets of the magnetic element directed towards the bottom of the container;
characterized - And in that the rotation of the magnetic rotary member (21) of the plate (4) is provided by an electric motor, provided with sensors able to measure the torque exerted on the rotary member (21); - And in that the plate (4) is provided with a suitable electronics and software, adapted according to the measurement of the sensors, to reduce the speed of rotation of the rotary member (21), and thus avoid the risk of stalling the magnetic interaction between the rotary member and the magnetic element (2). Dispositif pour réaliser l'agitation d'un milieu liquide contenu dans un récipient (1) selon la revendication 1, caractérisé en ce que l'élément magnétique mobile comprend un arbre (9) sensiblement vertical monté libre en rotation sur une base (5) solidarisée au fond du récipient, et notamment au centre dudit récipient, les aimants (13, 14) étant montés au voisinage de l'extrémité d'extensions radiales (12) émanant dudit arbre (9).Device for agitating a liquid medium contained in a container (1) according to claim 1, characterized in that the movable magnetic element comprises a substantially vertical shaft (9) mounted free to rotate on a base (5) secured to the bottom of the container, and in particular in the center of said container, the magnets (13, 14) being mounted near the end of radial extensions (12) emanating from said shaft (9). Dispositif pour réaliser l'agitation d'un milieu liquide contenu dans un récipient (1) selon la revendication 2, caractérisé en ce que la solidarisation est réversible.Device for agitating a liquid medium contained in a container (1) according to claim 2, characterized in that the fastening is reversible. Dispositif pour réaliser l'agitation d'un milieu liquide contenu dans un récipient (1) selon la revendication 3, caractérisé en ce que la solidarisation de la base (5) au fond (3) du récipient est obtenue par interaction magnétique, ladite base étant munie à cet effet d'un aimant permanent (6) venant coopérer avec un aimant permanent (20) de polarité opposé, solidarisé au fond du récipient et à l'extérieur de celui-ci.Device for agitating a liquid medium contained in a container (1) according to claim 3, characterized in that the fastening of the base (5) to the bottom (3) of the container is obtained by magnetic interaction, said base being provided for this purpose with a permanent magnet (6) cooperating with a permanent magnet (20) of opposite polarity, secured to the bottom of the container and outside thereof.
EP10305883A 2009-08-20 2010-08-12 Device for agitating a liquid medium Withdrawn EP2286907A1 (en)

Applications Claiming Priority (1)

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FR0955721A FR2949200A1 (en) 2009-08-20 2009-08-20 DEVICE FOR REALIZING AGITATION OF A LIQUID MEDIUM

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CN108339482A (en) * 2017-01-25 2018-07-31 捷特生物制药有限公司 Blender for agitator vessel
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