EP0599010B1 - Double impeller for stirring sterile liquids. - Google Patents

Double impeller for stirring sterile liquids. Download PDF

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Publication number
EP0599010B1
EP0599010B1 EP93115169A EP93115169A EP0599010B1 EP 0599010 B1 EP0599010 B1 EP 0599010B1 EP 93115169 A EP93115169 A EP 93115169A EP 93115169 A EP93115169 A EP 93115169A EP 0599010 B1 EP0599010 B1 EP 0599010B1
Authority
EP
European Patent Office
Prior art keywords
impeller
flow
container
propeller
stirring
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.)
Expired - Lifetime
Application number
EP93115169A
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German (de)
French (fr)
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EP0599010A1 (en
Inventor
Hans Peter Meier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mavag Verfahrenstechnik AG
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Mavag Verfahrenstechnik AG
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Publication of EP0599010A1 publication Critical patent/EP0599010A1/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
    • 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 a container with a Container bottom (4) arranged impeller for stirring, especially consisting of sterile liquids from an impeller head (2) with one on it arranged Ruhr tool and one of the container bottom (4) facing lower opening for receiving a Pin (6) in a central cavity (15), wherein the impeller contactless, inductive or magnetic, is drivable.
  • Such an impeller is from, for example American Patent 4,993,841 and the EP-A1 0 399 972 known.
  • the impellers have one Variety of radially outward extending Stirring blades as stirring tools.
  • a flow is generated in the container that a vortex-like in the container liquid Flow with the impeller as the center effect. So it forms above the impeller Vacuum caused by the suction of the surface of the Liquid is conical towards the Let impellers protrude.
  • the one in this area prevailing negative pressure is undesirable since it is the Gas entry into the liquid favors and at some liquids cause foam.
  • the object of the invention is a different flow in To produce containers that also have a has improved mixing and stirring effects.
  • the stirring tool is designed as a propeller, one of Tank bottom away upward flow generating direction of rotation, and in the near Bottom area arranged additionally flow-generating surfaces are provided, the one deviating from the flow caused by the propeller directed flow downwards or sideways let arise.
  • the one in the center Negative pressure zone is created by the upward flow more than compensated, so that an undesired gas entry is avoided. Foaming effects are reduced.
  • By the opposite flow in the lower area the axial forces of the propeller become partial compensated. The life expectancy of the bearings will advantageously increased.
  • the lower flow-generating surfaces as wings are formed on the impeller.
  • the size of the wing can affect the impeller acting axial forces almost completely compensated will.
  • the measure that between the central cavity and the outer surface at least one connecting Line is provided serves the interior Cavity of the impeller is constantly filled with liquid rinse, which makes cleaning the impeller easier.
  • the best stirring effect is achieved when the Propeller a distance to the bottom Impeller end face that the simple to corresponds to twice the diameter of the propeller, preferably corresponds to 11 ⁇ 2 times.
  • FIG 1 denotes the drive shaft of one further detailed drive unit of a Impeller head 2, which on a shaft end 20 as Stirring tool with several propellers Propeller blades 3 carries.
  • the impeller head 2 is in the arranged lower part of a container, the lower Container wall 4 in broken lines is shown.
  • a Mounting flange 5 welded to the inside of the Container pointing a pin 6 and inside is hollow.
  • the mounting flange 5 is usually made of non-magnetic Made of steel.
  • the upper part of the pin 6 is as cylindrical seat 8 of a bearing 9 shaped. camp 9 serves for rotatably fixing the impeller head 2 with the seat turned 10.
  • Inside the Impeller head 2 are the magnetic disk 7 opposite a number opposite Polarized permanent magnets 11 arranged so that through the magnetic forces between Magnetic disk 7 and the permanent magnet 11th torque from drive shaft 1 without contact Impeller head 2 can be transferred.
  • the lower end face 12 of the impeller 2 is through Correspondingly milled grooves 13 shaped so that when the impeller head 2 is turned there is a pumping effect.
  • Figure 2 shows a horizontal section of the Impeller head according to section line II-II in Figure 1, the parts on the container side for the sake of clarity are not shown.
  • the grooves 13 are shown. Through the one paddle wheel similar arrangement of the grooves 13 results when rotating of the impeller head 2 in the direction of arrow 14 Pump effect, the one from cavity 15 of the impeller head 2 outward flow generated by Arrows 16 is indicated. It is supplemented from the central cavity 13 aspirated liquid through the the cavity 15 with the surface 19 of the Impeller head 2 connecting line 17.
  • the propeller blades 3 are set so that when turning the impeller head due to the stirring forces a downward axial force forms as Reactive force of a vertically upward Flow.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mixers With Rotating Receptacles And Mixers With Vibration Mechanisms (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Accessories For Mixers (AREA)

Description

Die Erfindung betrifft einen Behälter mit einem am Behälterboden (4) angeordneten Impeller zum Rühren, insbesondere von sterilen Flüssigkeiten, bestehend aus einem Impellerkopf (2) mit einem an diesem angeordneten Ruhrwerkzeug und einer dem Behälterboden (4) zugewandten unteren Öffnung zur Aufnahme eines Zapfens (6) in einem zentralen Hohlraum (15), wobei der Impeller berührungslos, induktiv oder magnetisch, antreibbar ausgebildet ist.The invention relates to a container with a Container bottom (4) arranged impeller for stirring, especially consisting of sterile liquids from an impeller head (2) with one on it arranged Ruhr tool and one of the container bottom (4) facing lower opening for receiving a Pin (6) in a central cavity (15), wherein the impeller contactless, inductive or magnetic, is drivable.

Ein derartiger Impeller ist zum Beispiel aus dem amerikanischen Patent 4,993,841 und der EP-A1 0 399 972 bekannt. Die Impeller weisen eine Vielzahl von sich radial nach außen erstreckende Rührblätter als Rührwerkzeuge auf. Im eingebauten Zustand wird im Behälter eine Strömung erzeugt, die in der Behälterflüssigkeit eine strudelartige Strömung mit dem Impeller als Mittelpunkt bewirkt. Oberhalb des Impeller bildet sich also ein Unterdruck, der durch den Sog die Oberfläche der Flüssigkeit sich kegelförmig in Richtung des Impellers ausstülpen läßt. Der in diesem Bereich herrschende Unterdruck ist unerwünscht, da er den Gaseintrag in die Flüssigkeit begünstigt und bei einigen Flüssigkeiten Schaum entstehen läßt.Such an impeller is from, for example American Patent 4,993,841 and the EP-A1 0 399 972 known. The impellers have one Variety of radially outward extending Stirring blades as stirring tools. In the built-in A flow is generated in the container that a vortex-like in the container liquid Flow with the impeller as the center effect. So it forms above the impeller Vacuum caused by the suction of the surface of the Liquid is conical towards the Let impellers protrude. The one in this area prevailing negative pressure is undesirable since it is the Gas entry into the liquid favors and at some liquids cause foam.

Aufgabe der Erfindung ist es, eine andere Strömung im Behälter zu erzeugen, die darüber hinaus eine verbesserte Misch- und Rührwirkung aufweist.The object of the invention is a different flow in To produce containers that also have a has improved mixing and stirring effects.

Die Aufgabe wird dadurch gelöst, daß das Rührwerkzeug als Propeller ausgebildet ist, der eine vom Behälterboden weg nach oben gerichtete Strömung erzeugende Drehrichtung aufweist, und im nahe dem Behälterboden angeordneten unteren Bereich zusätzlich strömungserzeugende Flächen vorgesehen sind, die eine von der vom Propeller bewirkten Strömung abweichend gerichtete Strömung nach unten oder seitlich entstehen lassen. Die im Zentrum vorhandene Unterdruckzone wird durch die vom Propeller erzeugte, nach oben gerichtete Strömung mehr als kompensiert, so daß ein unerwünschter Gaseintrag vermieden wird. Effekte der Schaumbildung werden vermindert. Durch die im unteren Bereich entgegengesetzte Strömung werden die axialen Kräfte des Propellers teilweise kompensiert. Die Lebenserwartung der Lager wird vorteilhaft erhöht.The object is achieved in that the stirring tool is designed as a propeller, one of Tank bottom away upward flow generating direction of rotation, and in the near Bottom area arranged additionally flow-generating surfaces are provided, the one deviating from the flow caused by the propeller directed flow downwards or sideways let arise. The one in the center Negative pressure zone is created by the upward flow more than compensated, so that an undesired gas entry is avoided. Foaming effects are reduced. By the opposite flow in the lower area the axial forces of the propeller become partial compensated. The life expectancy of the bearings will advantageously increased.

In Ausgestaltung der Erfindung ist vorgesehen, daß die unteren strömungserzeugenden Flächen als Flügel am Impeller ausgebildet sind. Je nach Anstellung und Größe der Flügel können die auf den Impeller wirkenden Axialkräfte fast vollständig kompensiert werden.In an embodiment of the invention it is provided that the lower flow-generating surfaces as wings are formed on the impeller. Depending on employment and The size of the wing can affect the impeller acting axial forces almost completely compensated will.

In anderer Ausgestaltung der Erfindung ist vorgesehen, daß die unteren strömungserzeugenden Flächen als turbinenartig ausgebildete untere Stirnfläche des Impellers ausgebildet sind. Auch bei geringen Füllhöhen wird die Rührwirkung hierdurch aufrechterhalten.In another embodiment of the invention provided that the lower flow-generating Areas as turbine-like lower ones End face of the impeller are formed. Also at the stirring effect is low maintain.

Die Maßnahme, daß zwischen zentralem Hohlraum und der äußeren Oberfläche mindestens eine verbindenden Leitung vorgesehen ist, dient dazu, den inneren Hohlraum des Impellers ständig mit Flüssigkeit zu spülen, was die Reinigung des Impeller erleichtert.The measure that between the central cavity and the outer surface at least one connecting Line is provided serves the interior Cavity of the impeller is constantly filled with liquid rinse, which makes cleaning the impeller easier.

Die beste Rührwirkung wird erzielt, wenn der Propeller einen Abstand zur unteren Impellerstirnfläche aufweist, der dem einfachen bis zweifachen des Propellerdurcbmessers entspricht, vorzugsweise dem 1½-fachen entspricht. The best stirring effect is achieved when the Propeller a distance to the bottom Impeller end face that the simple to corresponds to twice the diameter of the propeller, preferably corresponds to 1½ times.

Die Erfindung wird in Zeichnungen beschrieben, wobei weitere vorteilhafte Einzelheiten den Zeichnungen zu entnehmen sind. Die Zeichnungen zeigen im einzelnen:

Fig. 1
einen Axialschnitt durch einen erfindungsgemäßen Doppel-Impeller mit turbinenartig ausgebildeter unterer Stirnfläche,
Fig. 2
einen Horizontalschnitt entsprechende Schnittlinie II-II in Figur 1,
Fig. 3
einen Axialschnitt durch einen erfindungsgemäßen Doppel-Impeller mit Flügeln im unteren Bereich und
Fig. 4
einen Horizontalschnitt entsprechend Schnittlinie IV-IV in Figur 3.
The invention is described in drawings, with further advantageous details being shown in the drawings. The drawings show in detail:
Fig. 1
3 shows an axial section through a double impeller according to the invention with a turbine-shaped lower end face,
Fig. 2
2 shows a horizontal section corresponding to section line II-II in FIG. 1,
Fig. 3
an axial section through a double impeller according to the invention with blades in the lower region and
Fig. 4
a horizontal section along section line IV-IV in Figure 3.

In Figur 1 bezeichnet 1 die Antriebswelle einer nicht weiter detaillierten Antriebseinheit eines Impellerkopfes 2, der an einem Wellenstummel 20 als Rührwerkzeug einen Propeller mit mehreren Propellerblättern 3 trägt. 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 und innen hohl ausgeführt ist. In diesen Hohlraum des Zapfens 6 ragt die Antriebswelle 1 hinein, die an ihrem oberen Ende eine mit mehreren Permapentmagneten bestückte Magnetscheibe 7 drehfest trägt. In Figure 1, 1 denotes the drive shaft of one further detailed drive unit of a Impeller head 2, which on a shaft end 20 as Stirring tool with several propellers Propeller blades 3 carries. The impeller head 2 is in the arranged lower part of a container, the lower Container wall 4 in broken lines is shown. In this wall is a Mounting flange 5 welded to the inside of the Container pointing a pin 6 and inside is hollow. In this cavity of the pin 6th protrudes into the drive shaft 1, which at its upper End one with several permapent magnets Magnetic disc 7 carries non-rotatably.

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 sind der Magnetscheibe 7 gegenüberliegend eine Anzahl entgegengesetzt polarisierter Permanentmagnete 11 angeordnet, so daß sich durch die magnetischen Kräfte zwischen Magnetscheibe 7 und dem Permanentmagneten 11 berührungsfrei ein Drehmoment von Antriebswelle 1 auf Impellerkopf 2 übertragen läßt.The mounting flange 5 is usually made of non-magnetic Made of steel. The upper part of the pin 6 is as cylindrical seat 8 of a bearing 9 shaped. camp 9 serves for rotatably fixing the impeller head 2 with the seat turned 10. Inside the Impeller head 2 are the magnetic disk 7 opposite a number opposite Polarized permanent magnets 11 arranged so that through the magnetic forces between Magnetic disk 7 and the permanent magnet 11th torque from drive shaft 1 without contact Impeller head 2 can be transferred.

Die untere Stirnfläche 12 des Impellers 2 ist durch entsprechend eingefräste Nuten 13 so geformt, daß sich bei Drehen des Impellerkopfes 2 ein Pumpeffekt ergibt.The lower end face 12 of the impeller 2 is through Correspondingly milled grooves 13 shaped so that when the impeller head 2 is turned there is a pumping effect.

Figur 2 zeigt einen horizontalen Schnitt des Impellerkopfes gemäß Schnittlinie II-II in Figur 1, wobei die behälterseitigen Teile der Übersicht halber nicht dargestellt sind. In unterbrochener Linienführung sind 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 19 des Impellerkopfes 2 verbindende Leitung 17.Figure 2 shows a horizontal section of the Impeller head according to section line II-II in Figure 1, the parts on the container side for the sake of clarity are not shown. In broken lines the grooves 13 are shown. Through the one paddle wheel similar arrangement of the grooves 13 results when rotating of the impeller head 2 in the direction of arrow 14 Pump effect, the one from cavity 15 of the impeller head 2 outward flow generated by Arrows 16 is indicated. It is supplemented from the central cavity 13 aspirated liquid through the the cavity 15 with the surface 19 of the Impeller head 2 connecting line 17.

Die Propellerblätter 3 sind so angestellt, daß sich beim Drehen des Impellerkopfes infolge der Rührkräfte eine nach unten gerichtete Axialkraft ausbildet als Reaktionskraft einer senkrecht nach oben gerichteten Strömung.The propeller blades 3 are set so that when turning the impeller head due to the stirring forces a downward axial force forms as Reactive force of a vertically upward Flow.

Durch die als Pumpenlaufrad ausgebildete untere Fläche 12 des Impellerkopfes 2 wird bei einem Antrieb in Pfeilrichtung 14 ein Unterdruck in Hohlraum 15 erzeugt, der eine zusätzliche Axialkraft bewirkt, die ebenfalls nach unten gerichtet ist. Sind jedoch zusätzliche Flügel 18 am Impellerkopf 2 angebracht, deren Anstellung bei Drehen des Impellers in Pfeilrichtung 14 so gewählt ist, daß daraus eine zusätzliche nach unten gerichtete Strömung erzeugt wird, so werden die Axialkräfte der Propellerblätter 3 teilweise kompensiert und eine besonders intensive Rühr- und Mischwirkung in der Behälterflüssigkeit erreicht, ohne die Lebenserwartung der Lager nachteilig zu beeinflussen.Due to the lower surface designed as a pump impeller 12 of the impeller head 2 is in a drive Direction of arrow 14 creates a negative pressure in cavity 15, which causes an additional axial force that also is directed downwards. However, are additional Wing 18 attached to the impeller head 2, the Adjustment when turning the impeller in the direction of arrow 14 is chosen so that an additional downward directional flow is generated, so the Axial forces of the propeller blades 3 partially compensated and a particularly intensive stirring and Mixing effect achieved in the container liquid without the life expectancy of the bearings adversely influence.

Die turbinenartige Ausgestaltung der unteren Stirnfläche 12 des Impellers sowie die Flügel 18 im unteren Bereich des Impellers können auch in ihrer Wirkung kombiniert werden.The turbine-like design of the lower one End face 12 of the impeller and the wing 18 in lower section of the impeller can also be in their Effect can be combined.

Dadurch ergibt sich ein Impellerkopf mit besonders intensiver Ruhr- und Mischwirkung, der auch bei niedrigen Füllhöhen unterhalb des Niveaus der Propellerflügel noch eine Rührwirkung aufweist. Außerdem ist er durch seine selbstreinigende Konstruktion besonders für den biotechnologischen Einsatz, z.B. in Fermentern, geeignet. In derartigen Einsatzfeldern bewährt sich auch das erzeugte andersgeartete Strömungsfeld, weil die Konstruktion der Schaumbildung entgegenwirkt. This results in an impeller head with special intensive stirring and mixing effect, which also with low filling levels below the level of Propeller blades still have a stirring effect. It is also self-cleaning Construction especially for the biotechnological Use, e.g. in fermenters. In such The fields of application also prove their worth different kind of flow field, because the construction of the Counteracts foam formation.

BEZUGSZEICHENLISTEREFERENCE SIGN LIST

11
Antriebswelledrive shaft
22nd
ImpellerkopfImpeller head
33rd
PropellerblätterPropeller blades
44th
BehälterwandungContainer wall
55
MontageflanschMounting flange
66
ZapfenCones
77
MagnetscheibeMagnetic disc
88th
SitzflächeSeat
99
Lagercamp
1010th
SitzflächeSeat
1111
PermanentmagnetPermanent magnet
1212th
untere Flächelower surface
1313
NutenGrooves
1414
PfeilrichtungArrow direction
1515
Hohlraumcavity
1616
PfeileArrows
1717th
verbindende Leitungconnecting line
1818th
Flügelwing
1919th
äußere Oberflächeouter surface
2020th
WellenstummelWave stub

Claims (5)

  1. Container having an impeller disposed at the container base (4) for stirring, in particular, sterile liquids, comprising an impeller head (2) having a stirring tool disposed thereon and a bottom opening directed towards the container base (4) for receiving a journal (6) in a central cavity (15), the impeller being drivable without contact, inductively or magnetically, characterized in that the stirring tool (3) is designed as a propeller, which has a direction of rotation generating an upward flow away from the container base (4), and provided in the bottom region disposed near the container base are additionally flow-generating surfaces which produce a downward or lateral flow in a different direction to the flow generated by the propeller.
  2. Container according to claim 1, characterized in that the bottom flow-generating surfaces take the form of wings (18) on the impeller.
  3. Container according to claim 1 or 2, characterized in that the bottom flow-generating surfaces take the form of a turbine-like bottom end face (12) of the impeller.
  4. Container according to claim 1, 2 or 3, characterized in that at least one connecting line (17) is provided between central cavity (15) and the outer surface (19).
  5. Container according to claim 1, 2, 3 or 4, characterized in that the propeller (3) is at a distance from the bottom end face (12) of the impeller which corresponds to one to two times, preferably one and a half times, the propeller diameter.
EP93115169A 1992-10-01 1993-09-21 Double impeller for stirring sterile liquids. Expired - Lifetime EP0599010B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4232934A DE4232934C2 (en) 1992-10-01 1992-10-01 Double impeller for stirring sterile liquids
DE4232934 1992-10-01

Publications (2)

Publication Number Publication Date
EP0599010A1 EP0599010A1 (en) 1994-06-01
EP0599010B1 true EP0599010B1 (en) 1998-01-21

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Country Status (4)

Country Link
US (1) US5407272A (en)
EP (1) EP0599010B1 (en)
JP (1) JPH07789A (en)
DE (1) DE4232934C2 (en)

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DE4232934C2 (en) 1996-03-28
EP0599010A1 (en) 1994-06-01
DE4232934A1 (en) 1994-04-07
US5407272A (en) 1995-04-18
JPH07789A (en) 1995-01-06

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