EP2138224B1 - Unit for agitating a liquid medium and magnetic agitator implementing such a unit - Google Patents

Unit for agitating a liquid medium and magnetic agitator implementing such a unit Download PDF

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Publication number
EP2138224B1
EP2138224B1 EP09305489A EP09305489A EP2138224B1 EP 2138224 B1 EP2138224 B1 EP 2138224B1 EP 09305489 A EP09305489 A EP 09305489A EP 09305489 A EP09305489 A EP 09305489A EP 2138224 B1 EP2138224 B1 EP 2138224B1
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unit
liquid medium
agitating
intended
magnetic
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German (de)
French (fr)
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EP2138224A1 (en
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Patrice Grayel
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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
    • B01F33/4532—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
    • 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

Definitions

  • the invention relates to a stirring member of a liquid medium, said member being provided with magnetic properties. It also relates to a magnetic stirrer using such a member.
  • the invention is particularly applicable in the field of pharmacy, food, chemistry and the nuclear industry.
  • magnetic stirrer in the abovementioned fields, is widely known.
  • a magnetic stirrer basically consists of a magnetic body, of cylindrical general shape, provided with permanent magnets oriented so as to have at least two opposite magnetic poles on either side of its geometric axis of rotation, subjected to a rotating magnetic field applied to the outside of the non-magnetic container receiving the liquid medium to be agitated and the magnetic body in question.
  • These magnetic bodies are traditionally made of a magnetic insert embedded in PTFE (such as for example Teflon ® ).
  • PTFE such as for example Teflon ®
  • the choice of PTFE is inherent in the friction of said agitator on the bottom of the container receiving the medium to be agitated. Notwithstanding the known qualities of low resistance to friction of PTFE, the experiment demonstrates however that because of the high rotation speeds traditionally printed on the magnetic body in question, a wear of PTFE is observed which may in particular induce release phenomena of very fine particles of PTFE in the medium to be agitated and, for example in the pharmaceutical field, in the active ingredient. These release phenomena are prohibitive both for this particular area and in the agri-food sector.
  • the rotation of the magnetic body at the bottom of the container also causes the wear of said container when, for example, it is made, as is most often the case, in the pharmaceutical or food industry, stainless steel .
  • Magnetic bodies consisting of a magnetic insert integrated in a casing made of stainless steel are also known.
  • the phenomena of wear of the container are, in this case, aggravated with respect to the implementation of magnetic body enveloping PTFE.
  • the objective of the present invention is to overcome the aforementioned drawbacks, besides optimizing the effectiveness of the mixture, including liquids of relatively high viscosity.
  • the invention therefore proposes a stirring member of a liquid medium incorporating or comprising a magnetic element intended to be positioned at the bottom of a non-magnetic container receiving the liquid medium to be agitated, and to ensure the agitation of said medium by rotation. on itself under the action of a magnetic field rotating about a vertical axis generated by a source disposed under said container.
  • the stirring member is provided with a vertical axis of rotation whose two ends are received at two flanges parallel to each other and secured to one another, the lower flange resting on the bottom of said container.
  • the two flanges each have flats intended to be parallel to each other two by two when the two flanges are assembled, and intended to promote the storage of the assembly consisting of said flanges and the magnetic element on its edge. when the stirring member is not in use.
  • the invention consists in implementing the principle of magnetic stirring, which is well known per se, but in which the magnetic bar or stirring member is not in contact with the bottom of the tank. and rotates, under the action of the external magnetic field freely and almost without friction, and to promote the storage of said stirring member, or in this case, to reduce the size generated.
  • the lower flange comprises on its face intended to come into contact with the bottom of the container pads made of PTFE, and this in order to avoid direct contact between the lower flange and the bottom of the container.
  • the lower flange and the upper flange are secured together by means of three peripheral struts, this fastening being reversible.
  • the upper flange is provided with through openings, intended to cooperate with the upper end of said spacers, said lights having a reversible locking point to ensure the stability of the assembly during use.
  • the vertical axis of rotation of the stirring element is received at the level of bearings respectively inside the lower flange and the upper flange, advantageously made of PEEK (PolyEthylEtherKetone) .
  • the magnetic element is not parallelepipedic but has substantially vertical extensions, extending from the lateral walls defining it, symmetrical to each other with respect to the axis vertical rotation.
  • the stirring element is substantially cross-shaped and again has vertical extensions symmetrical two by two with respect to the vertical axis of rotation of said element.
  • the invention also relates to a magnetic stirrer using such a stirring member.
  • this stirring member is intended to rest on the bottom of a tank, for example made of stainless steel, and therefore made of a non-magnetic material, containing a liquid medium to be stirred. Said tank is placed on a source generating a rotating magnetic field.
  • the stirring member 1 of the invention is therefore in this case constituted by a magnetic bar 2, described in more detail later, capable of rotating about itself in rotation about a vertical axis 6 received at its ends.
  • a magnetic bar 2 described in more detail later
  • each of these flanges is substantially circular in shape, and defines a place of reception of the vertical axis 6 of the bar 2, formed in the central zone by means of radial axes 7.
  • At least the lower flange 3 is provided with pads 8 made of PTFE (Teflon ® ), coming to clip at the through orifices provided for this purpose within the circular peripheral portion of said flange.
  • the receiving cage 1 of the magnetic bar 2 rests on the bottom of the tank, not directly at the lower flange, but through such pads, thus avoiding any risk of scratching said bottom. It should be remembered that the cage 1 is static at the bottom of the tank, only the magnetic bar 2 being rotatable on itself under the action of the external magnetic field.
  • These flanges 3 and 4 are for example made of stainless steel, or even food grade, and in this case type 316L.
  • the joining of the two flanges 3 and 4 to each other is reversible.
  • the upper flange 4 is pierced at its periphery with through-holes 9, intended to receive the free upper end 10 of the spacers 5 fixed in their definitive manner on the lower flange 3.
  • the magnetic bar proper 2 and more particularly the two ends of its vertical axis of rotation 6, are received in bearings 14, formed at the housing 16 and 17 respectively lower and upper flanges.
  • bearings are for example made of PEEK. It is therefore a wear part, made of a material compatible with food.
  • the two flanges 3 and 4 are not strictly circular, but each have flats 18 intended to be parallel to each other in pairs when the two flanges are assembled. These flats are intended to promote the storage of said cages 1 thus produced on their edge, when the stirring member is not in use or to promote their transport, thus giving them a relative stability.
  • the magnetic bar itself 2 comprises within it one or two magnetic elements 19, defining at the two ends of the bar a north pole and a south pole, clean, in known manner, to allow the effective rotation of the bar under the action of the rotating external magnetic field.
  • This magnetic element is integrated in an envelope, in this case also made of stainless steel advantageously food compatible 316L.
  • the envelope is also made of PTFE.
  • the magnetic bar 2 is a simple rectangular parallelepiped.
  • the axis of rotation 6 of the bar is obviously positioned centrally relative to the main faces of the bar.
  • the bar 2 further comprises vertical extensions 20 extending the main lateral faces of said bar. These vertical extensions or wings 20 are symmetrical to each other with respect to the axis of rotation 6 of the bar. This particular profile optimizes the vortex generated by the rotation of the bar and is particularly advantageous in the case of liquid media of high viscosity.
  • the base of the bar also comprises a blade 21 extending substantially horizontally from the lateral face of said bar opposite to the wing 20.

Abstract

The unit (1) has a magnetic stirring bar (2) placed at bottom of a non-magnetic container receiving liquid media, and a vertical rotational axle (6) with ends received at the level of bearings, respectively, placed inside lower and upper flasks (3, 4). The flasks are parallel to each other and integrated relative to each other, where the lower flask having pads (8) rests on the bottom. The flasks respectively have flat sections parallel to each other when the flasks are assembled, where flat sections favor storage of an assembly formed by the flasks and the bar when the unit is not in use.

Description

DOMAINE DE L'INVENTIONFIELD OF THE INVENTION

L'invention concerne un organe d'agitation d'un milieu liquide, ledit organe étant pourvu de propriétés magnétiques. Elle vise également un agitateur magnétique mettant en oeuvre un tel organe.The invention relates to a stirring member of a liquid medium, said member being provided with magnetic properties. It also relates to a magnetic stirrer using such a member.

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

ETAT DE LA TECHNIQUESTATE OF THE ART

La mise en oeuvre d'agitateur magnétique, dans les domaines précités, 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'aimants permanents orientés de telle sorte à présenter au moins deux pôles magnétiques opposés de part et d'autre de son axe de rotation géométrique, soumis à un champ magnétique tournant appliqué à l'extérieur du récipient non magnétique recevant le milieu liquide à agiter et le corps magnétique en question.The use of magnetic stirrer, in the abovementioned fields, is widely known. For example, it has been described in the document FR-2 336 052 such a magnetic stirrer. It basically consists of a magnetic body, of cylindrical general shape, provided with permanent magnets oriented so as to have at least two opposite magnetic poles on either side of its geometric axis of rotation, subjected to a rotating magnetic field applied to the outside of the non-magnetic container receiving the liquid medium to be agitated and the magnetic body in question.

Ces corps magnétiques sont traditionnellement constitués d'un insert magnétique noyé dans du PTFE (tel que par exemple le Téflon®). Le choix du PTFE est inhérent au frottement dudit agitateur sur le fond du récipient recevant le milieu à agiter. Nonobstant les qualités connues de faible résistance au frottement du PTFE, l'expérience démontre cependant qu'en raison des grandes vitesses de rotation traditionnellement imprimées au corps magnétique en question, on observe une usure du PTFE susceptible notamment d'induire des phénomènes de relargage de très fines particules de PTFE dans le milieu à agiter et, s'agissant par exemple du domaine pharmaceutique, dans le principe actif. Ces phénomènes de relargage sont rédhibitoires tant pour ce domaine particulier que dans celui de l'agroalimentaire.These magnetic bodies are traditionally made of a magnetic insert embedded in PTFE (such as for example Teflon ® ). The choice of PTFE is inherent in the friction of said agitator on the bottom of the container receiving the medium to be agitated. Notwithstanding the known qualities of low resistance to friction of PTFE, the experiment demonstrates however that because of the high rotation speeds traditionally printed on the magnetic body in question, a wear of PTFE is observed which may in particular induce release phenomena of very fine particles of PTFE in the medium to be agitated and, for example in the pharmaceutical field, in the active ingredient. These release phenomena are prohibitive both for this particular area and in the agri-food sector.

Au surplus, la rotation du corps magnétique au fond du récipient engendre également l'usure dudit récipient lorsque, par exemple, celui-ci est réalisé, comme c'est le cas le plus souvent, dans le domaine pharmaceutique ou agroalimentaire, en acier inoxydable.In addition, the rotation of the magnetic body at the bottom of the container also causes the wear of said container when, for example, it is made, as is most often the case, in the pharmaceutical or food industry, stainless steel .

On connaît également des corps magnétiques constitués d'un insert magnétique intégré dans une enveloppe réalisée elle-même en acier inoxydable. Les phénomènes d'usure du récipient sont, dans cette hypothèse, aggravés par rapport à la mise en oeuvre de corps magnétique enveloppant le PTFE. Au surplus, on observe là aussi des phénomènes de relargage de particules d'acier inoxydable, tout aussi rédhibitoires.Magnetic bodies consisting of a magnetic insert integrated in a casing made of stainless steel are also known. The phenomena of wear of the container are, in this case, aggravated with respect to the implementation of magnetic body enveloping PTFE. In addition, there are also phenomena of release of stainless steel particles, equally unacceptable.

On a décrit dans le document US 4 162 855 un organe d'agitation comportant un élément magnétique du type précité, dont l'axe de rotation est reçu au niveau de ses deux extrémités au niveau de flasques parallèles entre eux et solidarisés l'un à l'autre.We have described in the document US 4,162,855 an agitating member comprising a magnetic element of the aforementioned type, whose axis of rotation is received at its two ends at flanges parallel to each other and secured to one another.

L'objectif visé par la présente invention est de s'affranchir des inconvénients précités, outre d'optimiser l'efficacité du mélange, y compris pour des liquides de viscosité relativement élevée.The objective of the present invention is to overcome the aforementioned drawbacks, besides optimizing the effectiveness of the mixture, including liquids of relatively high viscosity.

EXPOSE DE L'INVENTIONSUMMARY OF THE INVENTION

L'invention propose donc un organe d'agitation d'un milieu liquide intégrant ou comportant un élément magnétique destiné à être positionné au fond d'un récipient non magnétique recevant le milieu liquide à agiter, et à assurer l'agitation dudit milieu par rotation sur lui-même sous l'action d'un champ magnétique tournant autour d'un axe vertical généré par une source disposée sous ledit récipient.The invention therefore proposes a stirring member of a liquid medium incorporating or comprising a magnetic element intended to be positioned at the bottom of a non-magnetic container receiving the liquid medium to be agitated, and to ensure the agitation of said medium by rotation. on itself under the action of a magnetic field rotating about a vertical axis generated by a source disposed under said container.

L'organe d'agitation est muni d'un axe vertical de rotation dont les deux extrémités sont reçues au niveau de deux flasques parallèles entre eux et solidarisés l'un à l'autre, le flasque inférieur reposant sur le fond dudit récipient. Les deux flasques présentent chacun des méplats destinés à être parallèles l'un à l'autre deux à deux lorsque les deux flasques sont assemblés, et destinés à favoriser le stockage de l'ensemble constitué par lesdits flasques et l'élément magnétique sur sa tranche, lorsque l'organe d'agitation n'est pas en utilisation.The stirring member is provided with a vertical axis of rotation whose two ends are received at two flanges parallel to each other and secured to one another, the lower flange resting on the bottom of said container. The two flanges each have flats intended to be parallel to each other two by two when the two flanges are assembled, and intended to promote the storage of the assembly consisting of said flanges and the magnetic element on its edge. when the stirring member is not in use.

En d'autres termes, l'invention consiste à mettre en oeuvre le principe de l'agitation magnétique, bien connu en soi, mais dans lequel le barreau magnétique ou organe d'agitation n'est pas en contact avec le fond de la cuve et tourne, sous l'action du champ magnétique extérieur librement et quasiment sans frottement, et à favoriser le stockage dudit organe d'agitation, ou dans cette hypothèse, de réduire l'encombrement généré.In other words, the invention consists in implementing the principle of magnetic stirring, which is well known per se, but in which the magnetic bar or stirring member is not in contact with the bottom of the tank. and rotates, under the action of the external magnetic field freely and almost without friction, and to promote the storage of said stirring member, or in this case, to reduce the size generated.

Selon l'invention, le flasque inférieur comporte sur sa face destinée à venir au contact du fond du récipient des patins réalisés en PTFE, et ce dans le souci d'éviter le contact direct entre le flasque inférieur et le fond du récipient.According to the invention, the lower flange comprises on its face intended to come into contact with the bottom of the container pads made of PTFE, and this in order to avoid direct contact between the lower flange and the bottom of the container.

Selon une autre caractéristique de l'invention, le flasque inférieur et le flasque supérieur sont solidarisés entre eux au moyen de trois entretoises périphériques, cette solidarisation étant réversible. A cet effet, le flasque supérieur est muni de lumières traversantes, destinées à coopérer avec l'extrémité supérieure desdites entretoises, lesdites lumières présentant un point de blocage réversible afin d'assurer la stabilité de l'ensemble lors de l'utilisation.According to another characteristic of the invention, the lower flange and the upper flange are secured together by means of three peripheral struts, this fastening being reversible. For this purpose, the upper flange is provided with through openings, intended to cooperate with the upper end of said spacers, said lights having a reversible locking point to ensure the stability of the assembly during use.

Selon une autre caractéristique avantageuse de l'invention, l'axe vertical de rotation de l'élément d'agitation est reçu au niveau de paliers ménagés à l'intérieur respectivement du flasque inférieur et du flasque supérieur, avantageusement réalisés en PEEK (PolyEthylEtherKetone).According to another advantageous characteristic of the invention, the vertical axis of rotation of the stirring element is received at the level of bearings respectively inside the lower flange and the upper flange, advantageously made of PEEK (PolyEthylEtherKetone) .

Selon une autre caractéristique de l'invention, l'élément magnétique n'est pas parallélépipédique mais présente des extensions sensiblement verticales, s'étendant à partir des parois latérales le définissant, symétriques l'une de l'autre par rapport à l'axe de rotation vertical.According to another characteristic of the invention, the magnetic element is not parallelepipedic but has substantially vertical extensions, extending from the lateral walls defining it, symmetrical to each other with respect to the axis vertical rotation.

Selon une autre forme de réalisation de l'invention, l'élément d'agitation est sensiblement en forme de croix et présente là encore des extensions verticales symétriques deux à deux par rapport à l'axe de rotation vertical dudit élément.According to another embodiment of the invention, the stirring element is substantially cross-shaped and again has vertical extensions symmetrical two by two with respect to the vertical axis of rotation of said element.

L'invention concerne également un agitateur magnétique mettant en oeuvre un tel organe d'agitation.The invention also relates to a magnetic stirrer using such a stirring member.

BREVE DESCRIPTION DES FIGURESBRIEF DESCRIPTION OF THE FIGURES

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

  • La figure 1 est une représentation schématique en perspective de l'organe d'agitation conforme à l'invention.
  • La figure2 est une représentation en éclaté de l'organe d'agitation de la figure 1.
  • La figure 3 est une vue de dessus d'une autre forme de réalisation de l'invention.
  • La figure 4 est une représentation schématique en perspective d'une variante du barreau magnétique de l'invention, dont la figure 5 est une vue de dessus et la figure 6 est une vue en section.
  • La figure 7 est une représentation schématique du dessus d'une autre invention du barreau de l'invention et la figure 8 est une vue en section.
  • La figure 9 est une vue schématique de dessus d'une autre variante du barreau de l'invention.
The way in which the invention can be realized and the advantages which result therefrom will emerge more clearly from the following exemplary embodiments, given by way of non-limiting indication, in support of the appended figures.
  • The figure 1 is a schematic representation in perspective of the stirring member according to the invention.
  • The figure2 is an exploded representation of the stirring member of the figure 1 .
  • The figure 3 is a top view of another embodiment of the invention.
  • The figure 4 is a schematic representation in perspective of a variant of the magnetic bar of the invention, the figure 5 is a view from above and the figure 6 is a sectional view.
  • The figure 7 is a schematic representation of the top of another invention of the bar of the invention and the figure 8 is a sectional view.
  • The figure 9 is a schematic view from above of another variant of the bar of the invention.

DESCRIPTION DETAILLEE DE L'INVENTIONDETAILED DESCRIPTION OF THE INVENTION

On a représenté en relation avec la figure 1 l'organe d'agitation conforme à l'invention. Fondamentalement, cet organe d'agitation est destiné à reposer sur le fond d'une cuve, par exemple réalisée en acier inoxydable, et donc réalisée en un matériau non magnétique, contenant un milieu liquide à agiter. Ladite cuve est placée sur une source générant un champ magnétique tournant. Ces caractéristiques étant connues en soi, elles n'ont donc pas été représentées sur les figures et ne seront donc pas davantage décrites en relation avec la présente invention.We have shown in relation to the figure 1 the stirring member according to the invention. Basically, this stirring member is intended to rest on the bottom of a tank, for example made of stainless steel, and therefore made of a non-magnetic material, containing a liquid medium to be stirred. Said tank is placed on a source generating a rotating magnetic field. These characteristics being known per se, they have therefore not been shown in the figures and will therefore not be further described in connection with the present invention.

L'organe d'agitation 1 de l'invention est donc en l'espèce constitué d'un barreau magnétique 2, décrit plus en détail ultérieurement, susceptible de tourner sur lui-même en rotation autour d'un axe vertical 6 reçu à ses deux extrémités au niveau de deux flasques parallèles entre eux, respectivement un flasque inférieur 3 et un flasque supérieur 4. The stirring member 1 of the invention is therefore in this case constituted by a magnetic bar 2, described in more detail later, capable of rotating about itself in rotation about a vertical axis 6 received at its ends. two ends at two flanges parallel to each other, respectively a lower flange 3 and an upper flange 4.

Ces deux flasques 3 et 4 sont solidarisés l'un à l'autre au moyen d'entretoises 5 verticales, en l'espèce trois, ménagées à leur périphérie.These two flanges 3 and 4 are secured to one another by means of vertical struts 5 , in this case three, formed at their periphery.

En outre, et ainsi qu'on peut mieux l'observe sur la figure 2, chacun de ces flasques est sensiblement de forme circulaire, et définit un lieu de réception de l'axe vertical 6 du barreau 2, ménagé en zone centrale par le biais d'axes radiaux 7. In addition, and so we can better observe it on the figure 2 each of these flanges is substantially circular in shape, and defines a place of reception of the vertical axis 6 of the bar 2, formed in the central zone by means of radial axes 7.

Selon une caractéristique de l'invention, à tout le moins le flasque inférieur 3 est muni de patins 8 réalisés en PTFE (Teflon®), venant se clipser au niveau d'orifices traversants ménagés à cet effet au sein de la partie périphérique circulaire dudit flasque. Ce faisant, la cage de réception 1 du barreau magnétique 2 repose sur le fond de la cuve, non pas directement au niveau du flasque inférieur, mais par l'intermédiaire de tels patins, évitant ainsi tout risque de rayure dudit fond. Il convient de rappeler que la cage 1 est statique au fond de la cuve, seul le barreau magnétique 2 étant susceptible de tourner sur lui-même sous l'action du champ magnétique extérieur.According to one characteristic of the invention, at least the lower flange 3 is provided with pads 8 made of PTFE (Teflon ® ), coming to clip at the through orifices provided for this purpose within the circular peripheral portion of said flange. In doing so, the receiving cage 1 of the magnetic bar 2 rests on the bottom of the tank, not directly at the lower flange, but through such pads, thus avoiding any risk of scratching said bottom. It should be remembered that the cage 1 is static at the bottom of the tank, only the magnetic bar 2 being rotatable on itself under the action of the external magnetic field.

Ces flasques 3 et 4 sont par exemple réalisés en acier inoxydable, voire même de qualité alimentaire, et dans ce cas de type 316L.These flanges 3 and 4 are for example made of stainless steel, or even food grade, and in this case type 316L.

Selon une autre caractéristique de l'invention, la solidarisation des deux flasques 3 et 4 entre eux est réversible. A cet effet, le flasque supérieur 4 est percé au niveau de sa périphérie de lumières traversantes 9, destinées à recevoir l'extrémité supérieure libre 10 des entretoises 5 fixées quant à elles de manière définitive sur le flasque inférieur 3.According to another characteristic of the invention, the joining of the two flanges 3 and 4 to each other is reversible. For this purpose, the upper flange 4 is pierced at its periphery with through-holes 9, intended to receive the free upper end 10 of the spacers 5 fixed in their definitive manner on the lower flange 3.

Ces extrémités supérieures 10 sont donc reçues au sein des lumières traversantes 9 et plus particulièrement au sein d'un orifice 11, se prolongeant par une lumière sensiblement linéaire 12 après passage par un point de résistance 13 ménagé entre l'orifice 11 et la lumière 12. Ce faisant, après insertion simultanée des extrémités supérieures 10 de chacune des trois entretoises 5 au niveau de l'orifice 11 correspondant, puis rotation du flasque supérieur 4 par rapport au flasque supérieur 3, et forcement du point de résistance 13, on vient réaliser la cage 1 constituant l'une des caractéristiques essentielles de l'invention., ladite cage étant stable et non susceptible de se désintégrer sous l'action de la rotation ou pour toute autre raison.These upper ends 10 are therefore received within the through-holes 9 and more particularly within an orifice 11, extending through a substantially linear lumen 12 after passing through a point of resistance 13 formed between the orifice 11 and the lumen 12 . in doing so, after the simultaneous insertion of the upper ends 10 of each of the three spacers 5 at the corresponding orifice 11, then rotation of the upper flange 4 with respect to upper plate 3, and forcing the pressure point 13, it comes achieve cage 1 constituting one of the essential features of the invention, said cage being stable and not likely to disintegrate under the action of rotation or for any other reason.

Selon l'invention, le barreau magnétique proprement dit 2 et plus particulièrement les deux extrémités de son axe vertical de rotation 6, sont reçus au sein de paliers 14, ménagés au niveau du logement 16 et 17 des flasques respectivement inférieur et supérieur. Ces paliers sont par exemple réalisés en PEEK. Il s'agit donc d'une pièce d'usure, réalisée en un matériau compatible sur le plan alimentaire.According to the invention, the magnetic bar proper 2 and more particularly the two ends of its vertical axis of rotation 6, are received in bearings 14, formed at the housing 16 and 17 respectively lower and upper flanges. These bearings are for example made of PEEK. It is therefore a wear part, made of a material compatible with food.

Avantageusement et ainsi qu'on peut par exemple bien l'observer sur la figure 3, les deux flasques 3 et 4 ne sont pas rigoureusement circulaires, mais présentent chacun des méplats 18 destinés à être parallèles l'un à l'autre deux à deux lorsque les deux flasque sont assemblés. Ces méplats sont destinés à favoriser le stockage desdites cages 1 ainsi réalisées sur leur tranche, lorsque l'organe d'agitation n'est pas en utilisation ou favoriser leur transport, en leur conférant ainsi une stabilité relative.Advantageously and thus we can, for example, well observe it on the figure 3 the two flanges 3 and 4 are not strictly circular, but each have flats 18 intended to be parallel to each other in pairs when the two flanges are assembled. These flats are intended to promote the storage of said cages 1 thus produced on their edge, when the stirring member is not in use or to promote their transport, thus giving them a relative stability.

Le barreau magnétique proprement dit 2 comporte en son sein un ou deux éléments magnétiques 19, définissant au niveau des deux extrémités du barreau un pôle nord et un pôle sud, propres, de manière connue, à permettre la rotation effective du barreau sous l'action du champ magnétique extérieur tournant.The magnetic bar itself 2 comprises within it one or two magnetic elements 19, defining at the two ends of the bar a north pole and a south pole, clean, in known manner, to allow the effective rotation of the bar under the action of the rotating external magnetic field.

Cet élément magnétique est intégré dans une enveloppe, en l'espèce également réalisée en acier inoxydable avantageusement compatible alimentaire 316L.This magnetic element is integrated in an envelope, in this case also made of stainless steel advantageously food compatible 316L.

On pourrait cependant concevoir que l'enveloppe soit également réalisée en PTFE.It could however be conceived that the envelope is also made of PTFE.

Dans sa version la plus simple représentée en relation avec la figure 3, le barreau magnétique 2 est un simple parallélépipède rectangle. L'axe de rotation 6 du barreau est bien évidemment positionné de manière centrale par rapport aux faces principales du barreau.In its simplest version represented in relation to the figure 3 , the magnetic bar 2 is a simple rectangular parallelepiped. The axis of rotation 6 of the bar is obviously positioned centrally relative to the main faces of the bar.

Dans une version plus évoluée, telle qu'illustrée au sein des figures 1, 2, 4, 5 et 6, le barreau 2 comporte en outre des extensions verticales 20 prolongeant les faces latérales principales dudit barreau. Ces extensions verticales ou ailes 20 sont symétriques l'une de l'autre par rapport à l'axe de rotation 6 du barreau. Ce profil particulier permet d'optimiser le vortex généré par la rotation du barreau et s'avère particulièrement avantageux dans le cas de milieux liquides de viscosité élevée.In a more advanced version, as illustrated in the figures 1 , 2 , 4 , 5 and 6 , the bar 2 further comprises vertical extensions 20 extending the main lateral faces of said bar. These vertical extensions or wings 20 are symmetrical to each other with respect to the axis of rotation 6 of the bar. This particular profile optimizes the vortex generated by the rotation of the bar and is particularly advantageous in the case of liquid media of high viscosity.

Selon une variante encore perfectionnée de cette forme de réalisation et représentée en figures 7 et 8, la base du barreau comporte également une lame 21 s'étendant sensiblement horizontalement, depuis la face latérale dudit barreau opposée à l'aile 20. Là encore, on optimise de manière supplémentaire la pénétration du barreau dans le liquide et par voie de conséquence la genèse du vortex.According to a still further variant of this embodiment and shown in Figures 7 and 8 , the base of the bar also comprises a blade 21 extending substantially horizontally from the lateral face of said bar opposite to the wing 20. Here again, the penetration of the bar in the liquid and, consequently, the genesis of the vortex.

On a également représenté à la figure 9 une autre variante dudit barreau. Celui-ci se présente sous la forme d'une croix munie là encore d'ailes verticales 20 symétriques deux à deux par rapport à l'axe de rotation vertical 6 du barreau.We also represented at the figure 9 another variant of said bar. This is in the form of a cross provided again with vertical wings 20 symmetrical two by two with respect to the vertical axis of rotation 6 of the bar.

On conçoit dès lors que de par la mise en oeuvre de l'organe d'agitation de l'invention, il n'y a donc plus frottement du barreau magnétique contre le fond du récipient qui le reçoit. On s'affranchit donc des phénomènes d'usure tant du barreau magnétique proprement dit, que du fond de la cuve.It is therefore conceivable that by the implementation of the stirring member of the invention, there is no longer friction of the magnetic bar against the bottom of the container that receives it. Thus the wear phenomena of both the magnetic bar proper and the bottom of the tank are overcome.

Au surplus, on a pu observer de par la mise en oeuvre de l'invention, une qualité optimisée des mélanges obtenus, avec des vitesses de rotation moindres, ce qui aboutit à une meilleure intégrité du mélange obtenu en raison de la diminution des phénomènes de cisaillement nés de la rotation du barreau magnétique.Moreover, it has been observed by the implementation of the invention, an optimized quality of the mixtures obtained, with lower speeds of rotation, which results in a better integrity of the mixture obtained due to the reduction of the phenomena of shear born from the rotation of the magnetic bar.

Au surplus, en conférant au barreau magnétique un profil particulier du type de ceux précédemment décrits, on a pu obtenir des mélanges de bonne qualité nonobstant la mise en oeuvre de produits très visqueux tels que par exemple la gélose, ce que l'on ne savait faire à ce jour avec les agitateurs magnétiques de l'art antérieur.Moreover, by conferring on the magnetic bar a particular profile of the type previously described, it was possible to obtain mixtures of good quality notwithstanding the use of very viscous products such as, for example, agar, which was not known. to do so with the magnetic stirrers of the prior art.

Claims (8)

  1. Unit for agitating a liquid medium that includes or comprises a magnetic element (2) intended to be positioned at the bottom of a nonmagnetic container receiving the liquid medium to be agitated, and to agitate said medium by rotation upon itself under the action of a magnetic field rotating around a vertical axis generated by a source placed under said container, said agitation unit being fitted with a vertical axis of rotation (6), whereof the two ends are received on two flanges (3, 4) parallel with each other and secured to each other, the lower flange (3) resting on the bottom of said container, characterized:
    ■ in that the two flanges (3, 4) each have plane parts (18) intended to be parallel with each other in twos when the two flanges are assembled, and intended to promote the storage of the assembly constituted by said flanges and the magnetic element on its edge, when the agitation unit is not in use;
    ■ in that the lower flange (3) and the upper flange (4) are secured to each other reversibly by means of peripheral struts (5);
    ■ and in that the upper flange (4) is fitted with through apertures (9), intended to engage with the upper end of said struts (5), said apertures having a reversible locking point (12) to stabilize the assembly during use.
  2. Unit for agitating a liquid medium as claimed in claim 1, characterized in that the two flanges (3, 4) are substantially circular in shape.
  3. Unit for agitating a liquid medium as claimed in one of claims 1 and 2, characterized in that the lower flange (3) comprises on its face intended to come into contact with the bottom of the container feet (8) made of PTFE, and does so in the interests of avoiding direct contact between the lower flange and the bottom of the container.
  4. Unit for agitating a liquid medium as claimed in one of claims 1 to 3, characterized in that the vertical axis of rotation (6) of the agitation element (2) is received on bearings (14) provided inside the lower flange (3) and upper flange (4) respectively, said bearings being made to advantage of PEEK (PolyEthylEtherKetone).
  5. Unit for agitating a liquid medium as claimed in one of claims 1 to 4, characterized in that the magnetic element (2) is not parallelepiped but has substantially vertical extensions (20), extending from the lateral walls that define it, symmetrical to each other relative to the vertical axis of rotation (6).
  6. Unit for agitating a liquid medium as claimed in claim 5, characterized in that the base of the magnetic element (2) also comprises a blade (21), extending substantially horizontally, from the lateral face of said element opposite the substantially vertical extension (20).
  7. Unit for agitating a liquid medium as claimed in one of claims 1 to 4, characterized in that the agitation element (2) is substantially in the shape of a cross, and in that it has vertical extensions (20), symmetrical in twos relative to the vertical axis of rotation (6) of said element.
  8. Magnetic agitator including an agitation unit as claimed in one of claims 1 to 7, intended to agitate a liquid medium including a magnetic element (2) intended to be positioned at the bottom of a nonmagnetic container receiving the liquid medium to be agitated, and a source placed under said container, intended to generate a rotating magnetic field capable of inducing said magnetic element to rotate upon itself.
EP09305489A 2008-06-26 2009-05-28 Unit for agitating a liquid medium and magnetic agitator implementing such a unit Active EP2138224B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0854296A FR2933010B1 (en) 2008-06-26 2008-06-26 AGITATOR ORGAN OF A LIQUID MEDIUM AND MAGNETIC AGITATOR IMPLEMENTING SUCH AN ORGAN.

Publications (2)

Publication Number Publication Date
EP2138224A1 EP2138224A1 (en) 2009-12-30
EP2138224B1 true EP2138224B1 (en) 2011-08-24

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EP09305489A Active EP2138224B1 (en) 2008-06-26 2009-05-28 Unit for agitating a liquid medium and magnetic agitator implementing such a unit

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EP (1) EP2138224B1 (en)
AT (1) ATE521404T1 (en)
FR (1) FR2933010B1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110160932B (en) * 2019-06-03 2023-12-15 西南石油大学 Oil-water relative permeability curve testing device and testing method

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4162855A (en) * 1974-11-18 1979-07-31 Spectroderm International, Inc. Magnetic stirrer apparatus
US3997272A (en) 1975-12-15 1976-12-14 Varian Associates Magnetic stirrer improvement
US4653519A (en) * 1985-07-09 1987-03-31 Ryder International Corporation Rinsing apparatus for contact lens cleaning system
JPS6331528A (en) * 1986-07-23 1988-02-10 Satake Kagaku Kikai Kogyo Kk Stirring apparatus
JP2007020387A (en) * 2005-06-07 2007-01-25 Maguneo Giken:Kk Superconductive non-contact rotation device

Also Published As

Publication number Publication date
FR2933010B1 (en) 2013-01-18
FR2933010A1 (en) 2010-01-01
EP2138224A1 (en) 2009-12-30
ATE521404T1 (en) 2011-09-15

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