EP0590473A1 - Impeller for stirring sterile liquids - Google Patents

Impeller for stirring sterile liquids Download PDF

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Publication number
EP0590473A1
EP0590473A1 EP93115171A EP93115171A EP0590473A1 EP 0590473 A1 EP0590473 A1 EP 0590473A1 EP 93115171 A EP93115171 A EP 93115171A EP 93115171 A EP93115171 A EP 93115171A EP 0590473 A1 EP0590473 A1 EP 0590473A1
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EP
European Patent Office
Prior art keywords
impeller
central cavity
rotation
cavity
flow
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Granted
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EP93115171A
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German (de)
French (fr)
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EP0590473B1 (en
Inventor
Hans Peter Meier
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Mavag Verfahrenstechnik AG
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Mavag Verfahrenstechnik AG
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Publication of EP0590473A1 publication Critical patent/EP0590473A1/en
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
    • B01F33/45—Magnetic mixers; Mixers with magnetically driven stirrers
    • B01F33/453—Magnetic mixers; Mixers with magnetically driven stirrers using supported or suspended stirring elements
    • B01F33/4535—Magnetic mixers; Mixers with magnetically driven stirrers using supported or suspended stirring elements using a stud for supporting the stirring element
    • 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
    • B01F35/40—Mounting or supporting mixing devices or receptacles; Clamping or holding arrangements therefor
    • B01F35/41—Mounting or supporting stirrer shafts or stirrer units on receptacles
    • B01F35/411—Mounting or supporting stirrer shafts or stirrer units on receptacles by supporting only one extremity of the shaft
    • B01F35/4112—Mounting or supporting stirrer shafts or stirrer units on receptacles by supporting only one extremity of the shaft at the bottom of the receptacle, e.g. by studs

Definitions

  • the invention relates to an impeller for stirring sterile liquids, consisting of an impeller head with stirring blades and an opening arranged below for receiving a pin in a central cavity, the impeller being non-contact, inductive or magnetic, drivable and the central cavity with the outer Surface has at least one connecting line.
  • Such an impeller is known, for example, from American Patent 4,993,841 and EP-A1 0 399 972.
  • the impeller heads have a plurality of radially outwardly extending stirring blades, behind which, viewed in the direction of rotation, lines open on the surface, which connect the outer surface to the central cavity. Since a vacuum zone forms behind the agitator blades during operation, liquid is sucked out of the inner cavity through these openings, which is supplemented again by the opening arranged at the bottom for receiving the drive pin. In this way, the internal cavity of the impeller can be flowed through during operation. When cleaning the container by means of appropriate sterilizing liquids, it can thus get inside the impeller for cleaning, so that dead corners are avoided, in which process liquid remains after the batch has been removed.
  • a disadvantage of the known impellers is that the self-cleaning effect ceases at low filling levels as soon as liquid no longer flows around through the highest opening of a line connecting the cavity to the surface, but instead comes into contact with the atmosphere.
  • the object of the invention is to provide an impeller, the self-cleaning function of which is ensured even at lower filling levels.
  • the impeller head in the lower region preferably its lower surface
  • the pump effect is not determined by the position of the connecting line, but by the special design of the lower impeller end.
  • the pump effect is thus achieved even at lower fill levels. It is sufficient, for example, to design the lower surface as a flow pump or to arrange turbine blade-like vanes on the side of the impeller.
  • the central cavity and / or the pin is formed in some areas as a conical bore or conical pin.
  • the overpressure generated creates an axial force on the impeller, which is opposite to the usual stirring forces in the axial direction. This partially compensates for the resulting axial forces.
  • Due to the conical design the flow cross section in the cavity changes depending on the axial position of the impeller relative to the plug. In certain cases, the impeller can be stored on a liquid film that adjusts itself automatically and assumes an equilibrium position.
  • the impeller has an axis of rotation, in the region of which the connecting line is arranged at the surface on the surface, the flow conditions at the mouth of the connecting line no longer influence the volume flow through the impeller.
  • the volume flow is therefore solely dependent on the pumping effect of the lower surface of the impeller designed for pumping.
  • the volume flow is to be additionally increased for certain process liquids, it can be provided to support the pumping effect that one or more connecting lines are arranged in the rotational direction behind the agitator blades.
  • the volume flowing through the impeller per unit of time can be increased if one or more connecting lines are arranged in front of the stirring blades.
  • the lower region of the impeller is designed as a positive displacement pump.
  • the central cavity may have an eccentric bore section in the opening area and the pin may have an elastomer impeller ring adapted to it.
  • a pump can then be realized in the manner of the known impeller pumps.
  • 1 denotes the drive shaft of a drive unit of an impeller head 2 which is not further detailed and which is equipped with a plurality of stirring blades 3.
  • the impeller head 2 is arranged in the lower part of a container, the lower container wall 4 of which is shown in broken lines.
  • a mounting flange 5 is welded into this wall, which has a pin 6 pointing towards the inside of the container, which is hollow on the inside.
  • the drive shaft 1 projects into this cavity of the journal 6 and carries at its upper end a magnetic disk 7 equipped with a plurality of permanent magnets.
  • the mounting flange 5 is usually made of non-magnetic steel.
  • the upper part of the pin 6 is shaped as a cylindrical seat 8 of a bearing 9.
  • Bearing 9 is used for rotatably fixing the impeller head 2 with the seat surface 10 screwed in.
  • the magnetic disk 7 is arranged opposite a number of oppositely polarized permanent magnets 11, so that the magnetic forces between the magnetic disk 7 and the permanent magnets 11 contactlessly produce a torque from the drive shaft 1 transferred to impeller head 2.
  • the lower surface 12 is shaped by correspondingly milled grooves 13 so that a pump effect results when the impeller head 2 is turned.
  • Figure 2 shows a horizontal section of the impeller head according to section line II-II, the container-side parts are not shown for the sake of clarity.
  • the grooves 13 are shown in broken lines. Due to the arrangement of the grooves 13 similar to a paddle wheel, when the impeller head 2 rotates in the direction of the arrow 14, a pump effect results which generates a flow directed outwards from the cavity 15 of the impeller head 2, which is indicated by arrows 16. The liquid drawn off from the central cavity 13 is supplemented by the line 17 connecting the cavity 15 to the surface of the impeller head 2.
  • the eyelet 18 can be connected to a hoist.
  • the outer surface 19 of the impeller head 2 is conical, so that when the impeller head is rotated, a downward axial force is formed as a result of the stirring forces.
  • the lower surface 13 of the impeller head 2 designed as a pump impeller generates a negative pressure in the cavity 15, which causes an additional axial force which is also directed downwards.
  • FIG. 3 shows a top view of the impeller head which rotates clockwise according to arrow 14.
  • Figure 4 illustrates the position of the grooves 13 on the lower surface of the impeller head 2.
  • the connecting lines 17 open into openings 21 on the surface of the impeller head.
  • the direction of rotation according to arrow 14 produces an outward flow corresponding to arrow 16 on the lower surface of the impeller head. This flow is fed by a flow entering opening 21 according to arrow 20.
  • openings 21 are arranged in the direction of rotation in front of the stirring blades 3, so that they are located on the pressure side of the stirring blades.
  • Figures 5 and 6 show the flow conditions in an opposite direction of rotation.
  • the flow according to arrow 16 occurs in the lower surface of the impeller 2 and generates an overpressure in the interior of the cavity.
  • the openings 21 are arranged behind the stirring blades 3 so that they lie on the negative pressure side of the stirring blades 3. The flow emerges from opening 21 according to arrow 20.
  • the pumping effect remains largely independent of the filling level inside the container.

Abstract

The invention relates to an impeller for stirring sterile liquids, comprising an impeller head (2) with stirrer blades (3) and an opening arranged beneath for receiving a spigot (6) in a central cavity, the impeller being designed to be driven contactlessly, inductively or magnetically, and the central cavity having at least one pipe (17) connecting to the outer surface. <IMAGE>

Description

Die Erfindung betrifft einen Impeller zum Rühren von sterilen Flüssigkeiten, bestehend aus einem Impellerkopf mit Rührblättern und einer unten angeordneten Öffnung zur Aufnahme eines Zapfens in einem zentralen Hohlraum, wobei der Impeller berührungslos, induktiv oder magnetisch, antreibbar ausgebildet ist und der zentrale Hohlraum mit der äußeren Oberfläche mindestens eine verbindende Leitung aufweist.The invention relates to an impeller for stirring sterile liquids, consisting of an impeller head with stirring blades and an opening arranged below for receiving a pin in a central cavity, the impeller being non-contact, inductive or magnetic, drivable and the central cavity with the outer Surface has at least one connecting line.

Ein derartiger Impeller ist zum Beispiel aus dem amerikanischen Patent 4,993,841 und der EP-A1 0 399 972 bekannt. Die Impellerköpfe weisen eine Vielzahl von sich radial nach außen erstreckende Rührblätter auf, hinter denen in Drehrichtung gesehen auf der Oberfläche Leitungen münden, die die äußere Oberfläche mit dem zentralen Hohlraum verbinden. Da sich im Betrieb hinter den Rührblättern eine Unterdruckzone ausbildet, wird durch diese Öffnungen Flüssigkeit aus dem inneren Hohlraum abgesaugt, die durch die unten angeordnete Öffnung zur Aufnahme des Antriebszapfens wieder ergänzt wird. Auf diese Weise kann der innen gelegene Hohlraum des Impellers während des Betriebes durchströmt werden. Beim Reinigen des Behälters mittels entsprechender sterilisierender Flüssigkeiten, kann diese also zur Reinigung ins Innere des Impellers gelangen, so daß tote Ecken vermieden werden, in denen Prozeßflüssigkeit nach Entnahme der Charge zurückbleibt.Such an impeller is known, for example, from American Patent 4,993,841 and EP-A1 0 399 972. The impeller heads have a plurality of radially outwardly extending stirring blades, behind which, viewed in the direction of rotation, lines open on the surface, which connect the outer surface to the central cavity. Since a vacuum zone forms behind the agitator blades during operation, liquid is sucked out of the inner cavity through these openings, which is supplemented again by the opening arranged at the bottom for receiving the drive pin. In this way, the internal cavity of the impeller can be flowed through during operation. When cleaning the container by means of appropriate sterilizing liquids, it can thus get inside the impeller for cleaning, so that dead corners are avoided, in which process liquid remains after the batch has been removed.

Nachteilig an den bekannten Impellern ist jedoch, daß der selbstreinigende Effekt bei niedrigen Füllhöhen aufhört, sobald durch die am höchsten gelegene Öffnung einer den Hohlraum mit der Oberfläche verbindenden Leitung nicht mehr von Flüssigkeit umströmt wird, sondern mit der Atmosphäre in Verbindung tritt.A disadvantage of the known impellers, however, is that the self-cleaning effect ceases at low filling levels as soon as liquid no longer flows around through the highest opening of a line connecting the cavity to the surface, but instead comes into contact with the atmosphere.

Durch das sich im Betrieb ausbildende Strömungsfeld tritt dieser Zustand schon bei Füllhöhen ein, deren Flüssigkeitsspiegel im statischen Fall noch den Impeller vollständig bedecken würde.Due to the flow field that develops during operation, this state already occurs at filling levels, the liquid level of which, in the static case, would still completely cover the impeller.

Aufgabe der Erfindung ist es, einen Impeller anzugeben, dessen selbstreinigende Funktion auch bei geringeren Füllhöhen gewährleistet ist.The object of the invention is to provide an impeller, the self-cleaning function of which is ensured even at lower filling levels.

Die Aufgabe wird dadurch gelöst, daß der Impellerkopf im unteren Bereich, vorzugsweise seine untere Fläche als Laufrad einer Pumpe, insbesondere einer Strömungspumpe, ausgebildet ist. Erfindungsgemäß wird der Pumpeffekt nicht durch die Lage der verbindenden Leitung bestimmt, sondern durch die spezielle Ausbildung des unteren Impellerendes. Der Pumpeffekt wird dadurch auch bei geringeren Füllstandhöhen erzielt. Dabei ist es ausreichend, beispielsweise die untere Flache als Strömungspumpe auszubilden oder turbinenschaufelartige Flügel seitlich am Impeller anzuordnen.The object is achieved in that the impeller head in the lower region, preferably its lower surface, is designed as an impeller of a pump, in particular a flow pump. According to the pump effect is not determined by the position of the connecting line, but by the special design of the lower impeller end. The pump effect is thus achieved even at lower fill levels. It is sufficient, for example, to design the lower surface as a flow pump or to arrange turbine blade-like vanes on the side of the impeller.

In Ausgestaltung der Erfindung ist vorgesehen, daß er eine Drehrichtung aufweist, die im zentralen Hohlraum einen Überdruck ausbildet. Hierdurch bildet sich eine Strömung aus, die von der tiefsten gelegenen Fläche des Impellers in den zentralen Hohlraum gerichtet ist. Aus diesem tritt die angesaugte Flüssigkeit dann aus den verbindenden Leitungen nach außen. Der innere Hohlraum bleibt dabei also mit Flüssigkeit gefüllt, auch wenn die verbindende Leitung in der Atmosphäre mündet und nicht von Flüssigkeit umströmt ist.In an embodiment of the invention, it is provided that it has a direction of rotation which forms an overpressure in the central cavity. This forms one Flow directed from the deepest surface of the impeller into the central cavity. From this, the aspirated liquid then emerges from the connecting lines to the outside. The inner cavity thus remains filled with liquid, even if the connecting line opens into the atmosphere and is not surrounded by liquid.

In weiterer Ausgestaltung der Erfindung ist vorgesehen, daß der zentrale Hohlraum und/oder der Zapfen in Teilbereichen als kegelförmige Bohrung bzw. kegelförmiger Zapfen ausgebildet ist. Der erzeugte Überdruck läßt eine axiale Kraft auf den Impeller entstehen, der den üblichen Rührkräften in axialer Richtung entgegengesetzt ist. Dadurch werden die resultierenden Axialkräfte teilweise ausgeglichen. Durch die kegelförmige Ausbildung verändert sich der Strömungsquerschnitt im Hohlraum in Abhängigkeit von der axialen Lage des Impellers zum Zapfen. In bestimmten Fällen kann dadurch eine Lagerung des Impellers auf einem Flüssigkeitsfilm erfolgen, der sich selbsttätig einstellt und eine Gleichgewichtslage einnimmt.In a further embodiment of the invention it is provided that the central cavity and / or the pin is formed in some areas as a conical bore or conical pin. The overpressure generated creates an axial force on the impeller, which is opposite to the usual stirring forces in the axial direction. This partially compensates for the resulting axial forces. Due to the conical design, the flow cross section in the cavity changes depending on the axial position of the impeller relative to the plug. In certain cases, the impeller can be stored on a liquid film that adjusts itself automatically and assumes an equilibrium position.

Wenn der Impeller eine Drehachse aufweist, in deren Bereich an der Oberfläche die verbindende Leitung mündend angeordnet ist, beeinflussen die Strömungsverhältnisses an der Mündung der verbindenden Leitung nicht mehr den Volumenstrom durch den Impeller. Der Volumenstrom ist somit allein abhängig von dem Pumpeffekt der zum Pumpen ausgebildeten unteren Fläche des Impellers.If the impeller has an axis of rotation, in the region of which the connecting line is arranged at the surface on the surface, the flow conditions at the mouth of the connecting line no longer influence the volume flow through the impeller. The volume flow is therefore solely dependent on the pumping effect of the lower surface of the impeller designed for pumping.

Soll für bestimmte Prozeßflüssigkeiten jedoch der Volumenstrom zusätzlich erhöht werden, so kann zur Unterstützung des Pumpeffekts vorgesehen werden, daß eine oder mehrere verbindenden Leitungen in Drehrichtung hinter den Rührblättern mündend angeordnet sind.If, however, the volume flow is to be additionally increased for certain process liquids, it can be provided to support the pumping effect that one or more connecting lines are arranged in the rotational direction behind the agitator blades.

In anderer Ausgestaltung der Erfindung ist vorgesehen, daß er eine Drehrichtung aufweist, die im zentralen Hohlraum einen Unterdruck ausbildet. Hierdurch wird das Entleeren von sterilen Behältern verbessert, da bei dieser Drehrichtung der zentrale Hohlraum des Impellers zwangsweise entleert wird.In another embodiment of the invention it is provided that it has a direction of rotation which forms a negative pressure in the central cavity. This improves the emptying of sterile containers, since the central cavity of the impeller is forcibly emptied in this direction of rotation.

Im Betrieb kann das den Impeller je Zeiteinheit durchströmende Volumen dadurch erhöht werden, wenn eine oder mehrere verbindende Leitungen vor den Rührblättern mündend angeordnet sind.In operation, the volume flowing through the impeller per unit of time can be increased if one or more connecting lines are arranged in front of the stirring blades.

Insbesondere für geringere Drehzahlen ist es vorteilhaft, wenn der untere Bereich des Impellers als Verdrängerpumpe ausgebildet ist. Dabei kann beispielsweise der zentrale Hohlraum einen exzentrischen Bohrungsabschnitt im Öffnungsbereich aufweisen und der Zapfen einen daran angepaßten Impellerkranz aus Elastomer tragen. Im Zusammenspiel mit entsprechend angeordneten Ein- und Auslaßöffnungen läßt sich dann eine Pumpe nach Art der bekannten Impellerpumpen verwirklichen.For lower speeds in particular, it is advantageous if the lower region of the impeller is designed as a positive displacement pump. For example, the central cavity may have an eccentric bore section in the opening area and the pin may have an elastomer impeller ring adapted to it. In cooperation with correspondingly arranged inlet and outlet openings, a pump can then be realized in the manner of the known impeller pumps.

Die Erfindung wird in Zeichnungen beschrieben, wobei weitere vorteilhafte Einzelheiten den Zeichnungen zu entnehmen sind.The invention is described in drawings, with further advantageous details being shown in the drawings.

Die Zeichnungen zeigen im einzelnen:

Fig. 1
einen Axialschnitt durch einen erfindungsgemäßen Impeller,
Fig. 2
einen Horizontalschnitt entsprechend Schnittlinie II-II in Figur 1
Fig. 3 und 4
Strömungsrichtungen bei Antrieb im Uhrzeigersinn und
Fig. 5 und 6
Strömungsrichtungen bei Antrieb gegen Uhrzeigersinn.
The drawings show in detail:
Fig. 1
an axial section through an impeller according to the invention,
Fig. 2
a horizontal section along section line II-II in Figure 1
3 and 4
Flow directions with clockwise drive and
5 and 6
Flow directions when driving counterclockwise.

In Figur 1 bezeichnet 1 die Antriebswelle einer nicht weiter detaillierten Antriebseinheit eines Impellerkopfes 2, der mit mehreren Rührblättern 3 ausgestattet ist. Der Impellerkopf 2 ist im unteren Teil eines Behälters angeordnet, dessen untere Behälterwandung 4 in unterbrochener Linienführung dargestellt ist. In diese Wandung ist ein Montageflansch 5 eingeschweißt, der zum Inneren des Behälters weisend einen Zapfen 6 aufweist, der innen hohl ausgeführt ist. In diesen Hohlraum des Zapfens 6 ragt die Antriebswelle 1 hinein, die an ihrem oberen Ende eine mit mehreren Permanentmagneten bestückte Magnetscheibe 7 drehfest trägt.In FIG. 1, 1 denotes the drive shaft of a drive unit of an impeller head 2 which is not further detailed and which is equipped with a plurality of stirring blades 3. The impeller head 2 is arranged in the lower part of a container, the lower container wall 4 of which is shown in broken lines. A mounting flange 5 is welded into this wall, which has a pin 6 pointing towards the inside of the container, which is hollow on the inside. The drive shaft 1 projects into this cavity of the journal 6 and carries at its upper end a magnetic disk 7 equipped with a plurality of permanent magnets.

Der Montageflansch 5 ist meist aus nicht magnetischem Stahl gefertigt. Der obere Teil des Zapfens 6 ist als zylindrische Sitzfläche 8 eines Lagers 9 geformt. Lager 9 dient zur drehbaren Fixierung des Impellerkopfes 2 mit eingedrehter Sitzfläche 10. Im Inneren des Impellerkopfes 2 ist der Magnetscheibe 7 gegenüberliegend eine Anzahl entgegengesetzt polarisierter Permanentmagnete 11 angeordnet, so daß sich durch die magnetischen Kräfte zwischen Magnetscheibe 7 und Permanentmagneten 11 berührungsfrei ein Drehmoment von Antriebswelle 1 auf Impellerkopf 2 übertragen läßt.The mounting flange 5 is usually made of non-magnetic steel. The upper part of the pin 6 is shaped as a cylindrical seat 8 of a bearing 9. Bearing 9 is used for rotatably fixing the impeller head 2 with the seat surface 10 screwed in. Inside the impeller head 2, the magnetic disk 7 is arranged opposite a number of oppositely polarized permanent magnets 11, so that the magnetic forces between the magnetic disk 7 and the permanent magnets 11 contactlessly produce a torque from the drive shaft 1 transferred to impeller head 2.

Die untere Fläche 12 ist durch entsprechend eingefräste Nuten 13 so geformt, daß sich bei Drehen des Impellerkopfes 2 ein Pumpeffekt ergibt.The lower surface 12 is shaped by correspondingly milled grooves 13 so that a pump effect results when the impeller head 2 is turned.

Figur 2 zeigt einen Horizontalschnitt des Impellerkopfes gemäß Schnittlinie II-II, wobei die behälterseitigen Teile der Übersichtlichkeit halber nicht dargestellt sind. In unterbrochener Linienführung sind darin die Nuten 13 gezeigt. Durch die einem Schaufelrad ähnelnde Anordnung der Nuten 13 ergibt sich bei Drehung des Impellerkopfes 2 in Pfeilrichtung 14 ein Pumpeffekt, der eine aus Hohlraum 15 des Impellerkopfes 2 nach außen gerichtete Strömung erzeugt, die durch Pfeile 16 angedeutet ist. Ergänzt wird die aus dem zentralen Hohlraum 13 abgesaugte Flüssigkeit durch die den Hohlraum 15 mit der Oberfläche des Impellerkopfes 2 verbindende Leitung 17.Figure 2 shows a horizontal section of the impeller head according to section line II-II, the container-side parts are not shown for the sake of clarity. The grooves 13 are shown in broken lines. Due to the arrangement of the grooves 13 similar to a paddle wheel, when the impeller head 2 rotates in the direction of the arrow 14, a pump effect results which generates a flow directed outwards from the cavity 15 of the impeller head 2, which is indicated by arrows 16. The liquid drawn off from the central cavity 13 is supplemented by the line 17 connecting the cavity 15 to the surface of the impeller head 2.

Zur Demontage des Impellerkopfes 2 kann Anschlagöse 18 mit einem Hebezeug verbunden werden.To disassemble the impeller head 2, the eyelet 18 can be connected to a hoist.

Die äußere Oberfläche 19 des Impellerkopfes 2 ist kegelförmig ausgebildet, so daß sich beim Drehen des Impellerkopfes infolge der Rührkräfte eine nach unten gerichtete Axialkraft ausbildet. Bei Antrieb in Pfeilrichtung 14 wird durch die als Pumpenlaufrad ausgebildete untere Fläche 13 des Impellerkopfes 2 ein Unterdruck in Hohlraum 15 erzeugt, der eine zusätzliche Axialkraft bewirkt, die ebenfalls nach unten gerichtet ist.The outer surface 19 of the impeller head 2 is conical, so that when the impeller head is rotated, a downward axial force is formed as a result of the stirring forces. When driving in the direction of the arrow 14, the lower surface 13 of the impeller head 2 designed as a pump impeller generates a negative pressure in the cavity 15, which causes an additional axial force which is also directed downwards.

Wird der Impellerkopf 2 jedoch in eine dem Pfeil 14 entgegengesetzte Richtung betrieben, so bildet sich eine Strömung durch Hohlraum 15 aus, die den Pfeilen 16 entgegengerichtet ist. Im Hohlraum 15 entsteht dabei ein Überdruck, der eine Axialkraft auf den Impellerkopf 2 bewirkt, die der Axialkraftkomponente der Rührkräfte entgegengesetzt ist. Auf diese Weise werden die Axialkräfte teilweise kompensiert.However, if the impeller head 2 is operated in a direction opposite the arrow 14, a flow through the cavity 15 is formed, which is directed in the opposite direction to the arrows 16. An overpressure is created in the cavity 15, which causes an axial force on the impeller head 2 which is opposite to the axial force component of the stirring forces. In this way, the axial forces are partially compensated for.

In Figur 3 ist eine Aufsicht des Impellerkopfes dargestellt, der sich entsprechend Pfeil 14 im Uhrzeigersinn dreht. Figur 4 verdeutlicht dabei die Lage der Nuten 13 an der unteren Fläche des Impellerkopfes 2. Die verbindenden Leitungen 17 münden in Öffnungen 21 an der Oberfläche des Impellerkopfes. Die Drehrichtung gemäß Pfeil 14 erzeugt an der unteren Fläche des Impellerkopfes eine nach außen entsprechend Pfeil 16 gerichtete Strömung. Diese Strömung wird genährt durch eine in Öffnung 21 eintretende Strömung entsprechend Pfeil 20. Zur Unterstützung der Pumpwirkung sind Öffnungen 21 in Drehrichtung vor den Rührblättern 3 angeordnet, so daS sie sich auf der Druckseite der Rührblätter befinden.FIG. 3 shows a top view of the impeller head which rotates clockwise according to arrow 14. Figure 4 illustrates the position of the grooves 13 on the lower surface of the impeller head 2. The connecting lines 17 open into openings 21 on the surface of the impeller head. The direction of rotation according to arrow 14 produces an outward flow corresponding to arrow 16 on the lower surface of the impeller head. This flow is fed by a flow entering opening 21 according to arrow 20. To support the pumping action, openings 21 are arranged in the direction of rotation in front of the stirring blades 3, so that they are located on the pressure side of the stirring blades.

Die Figuren 5 und 6 zeigen die Strömungsverhältnisse bei einer entgegengesetzten Drehrichtung. Hier tritt in der unteren Fläche des Impellers 2 die Strömung gemäß Pfeil 16 ein und erzeugt im Inneren des Hohlraumes einen Überdruck. Zur Unterstützung der Spülwirkung sind die Öffnungen 21 hinter den Rührblättern 3 angeordnet, so daß sie auf der Unterdruckseite der Rührblätter 3 liegen. Die Strömung tritt aus Öffnung 21 also gemäß Pfeil 20 aus.Figures 5 and 6 show the flow conditions in an opposite direction of rotation. Here the flow according to arrow 16 occurs in the lower surface of the impeller 2 and generates an overpressure in the interior of the cavity. To support the rinsing action, the openings 21 are arranged behind the stirring blades 3 so that they lie on the negative pressure side of the stirring blades 3. The flow emerges from opening 21 according to arrow 20.

In den Figuren ist keine Lagerung auf leicht kegelförmigen Flächen dargestellt. Für den Fachmann jedoch leicht verständlich ist, daß bei kegeligen Lagerflächen zwischen Zapfen 6 und Impellerkopf 2 ein Spalt entsteht, der je nach axialer Lage des Impellerkopfes unterschiedliche Strömungsquerschnitte im Hohlraum 15 freigibt. In Abhängigkeit dieses Querschnitts bildet sich in Hohlraum 15 ein entsprechender Überdruck aus, der den Spalt selbsttätig in einer Gleichgewichtlage hält.No storage on slightly conical surfaces is shown in the figures. However, it is easy for the person skilled in the art to understand that, in the case of tapered bearing surfaces, a gap is formed between the pin 6 and the impeller head 2, which releases different flow cross sections in the cavity 15 depending on the axial position of the impeller head. Depending on this cross section, a corresponding overpressure forms in the cavity 15, which automatically keeps the gap in an equilibrium position.

Der Pumpeffekt bleibt in weitestgehendem Maße unabhängig von der Füllhöhe innerhalb des Behälters.The pumping effect remains largely independent of the filling level inside the container.

BEZUGSZEICHENLISTEREFERENCE SIGN LIST

11
Antriebswelledrive shaft
22nd
ImpellerkopfImpeller head
33rd
RührblätterStirring blades
44th
BehälterwandungContainer wall
55
MontageflanschMounting flange
66
ZapfenCones
77
MagnetscheibeMagnetic disc
88th
SitzflächeSeat
99
Lagerwarehouse
1010th
SitzflächeSeat
1111
PermanentmagnetPermanent magnet
1212th
untere Flächelower surface
1313
NutenGrooves
1414
Pfeilrichtung (Drehrichtung)Direction of arrow (direction of rotation)
1515
Hohlraumcavity
1616
Pfeile (Strömungsrichtung bei Nuten 13)Arrows (flow direction with grooves 13)
1717th
verbindende Leitungconnecting line
1818th
AnschlagöseLifting eye
1919th
äußere Oberflächeouter surface
2020th
Pfeil (Strömungsrichtung bei Öffnung 21)Arrow (flow direction at opening 21)
2121
Öffnungopening

Claims (8)

Impeller zum Rühren von sterilen Flüssigkeiten, bestehend aus einem Impellerkopf (2) mit Rührblättern (3) und einer unten angeordneten Öffnung zur Aufnahme eines Zapfens (6) in einem zentralen Hohlraum (15), wobei der Impeller berührungslos, induktiv oder magnetisch, antreibbar ausgebildet ist und der zentrale Hohlraum (15) mit der äußeren Oberfläche (19) mindestens eine verbindende Leitung (17) aufweist, dadurch gekennzeichnet, daß der Impellerkopf (2) im unteren Bereich, vorzugsweise seine untere Fläche (12), als Laufrad einer Pumpe, insbesondere einer Strömungspumpe, ausgebildet ist.Impeller for stirring sterile liquids, consisting of an impeller head (2) with stirring blades (3) and an opening at the bottom for receiving a pin (6) in a central cavity (15), the impeller being non-contact, inductive or magnetic, drivable and the central cavity (15) with the outer surface (19) has at least one connecting line (17), characterized in that the impeller head (2) in the lower region, preferably its lower surface (12), as an impeller of a pump, in particular a flow pump. Impeller nach Anspruch 1, dadurch gekennzeichnet, daß er eine Drehrichtung aufweist, die im zentralen Hohlraum (15) einen Überdruck ausbildet.Impeller according to claim 1, characterized in that it has a direction of rotation which forms an overpressure in the central cavity (15). Impeller nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der zentrale Hohlraum (15) und/oder der Zapfen (6) in Teilbereichen als kegelförmige Bohrung bzw. kegelförmiger Zapfen ausgebildet ist.Impeller according to claim 1 or 2, characterized in that the central cavity (15) and / or the pin (6) is designed in some areas as a conical bore or conical pin. Impeller nach Anspruch 1, 2 oder 3, dadurch gekennzeichnet, daß er eine Drehachse aufweist, in deren Bereich an der Oberfläche (19) die verbindende Leitung (17) mündend angeordnet ist.Impeller according to claim 1, 2 or 3, characterized in that it has an axis of rotation, in the area of which the connecting line (17) is arranged at the surface (19). Impeller nach Anspruch 1, 2, 3 oder 4, dadurch gekennzeichnet, daß eine oder mehrere verbindenden Leitungen (17) in Drehrichtung hinter den Rührblättern (3) mündend angeordnet sind.Impeller according to claim 1, 2, 3 or 4, characterized in that one or more connecting lines (17) are arranged opening in the direction of rotation behind the stirring blades (3). Impeller nach Anspruch 1,dadurch gekennzeichnet, daß er eine Drehrichtung aufweist, die im zentralen Hohlraum (15) einen Unterdruck ausbildet.Impeller according to claim 1 , characterized in that it has a direction of rotation which forms a negative pressure in the central cavity (15). Impeller nach Anspruch 1, 2, 3, 4, 5 oder 6, dadurch gekennzeichnet, daß eine oder mehrere verbindende Leitungen (17) vor den Rührblättern (3) mündend angeordnet sind.Impeller according to claim 1, 2, 3, 4, 5 or 6 , characterized in that one or more connecting lines (17) are arranged in front of the stirring blades (3). Impeller nach Anspruch 1, 2, 3, 4, 5, 6 oder 7, dadurch gekennzeichnet, daß der untere Bereich des Impellers als Verdrängerpumpe ausgebildet ist.Impeller according to claim 1, 2, 3, 4, 5, 6 or 7, characterized in that the lower region of the impeller is designed as a positive displacement pump.
EP93115171A 1992-10-01 1993-09-21 Impeller for stirring sterile liquids Expired - Lifetime EP0590473B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4232936 1992-10-01
DE4232936A DE4232936C2 (en) 1992-10-01 1992-10-01 Impeller for stirring sterile liquids

Publications (2)

Publication Number Publication Date
EP0590473A1 true EP0590473A1 (en) 1994-04-06
EP0590473B1 EP0590473B1 (en) 1996-12-11

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP93115171A Expired - Lifetime EP0590473B1 (en) 1992-10-01 1993-09-21 Impeller for stirring sterile liquids

Country Status (4)

Country Link
US (1) US5393142A (en)
EP (1) EP0590473B1 (en)
JP (1) JPH07790A (en)
DE (1) DE4232936C2 (en)

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US10632433B2 (en) 2006-05-13 2020-04-28 Pall Life Sciences Belgium Bvba Disposable bioreactor
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Also Published As

Publication number Publication date
US5393142A (en) 1995-02-28
EP0590473B1 (en) 1996-12-11
DE4232936C2 (en) 1996-03-28
JPH07790A (en) 1995-01-06
DE4232936A1 (en) 1994-04-07

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