EP1475145B1 - Impeller - Google Patents

Impeller Download PDF

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Publication number
EP1475145B1
EP1475145B1 EP04010919A EP04010919A EP1475145B1 EP 1475145 B1 EP1475145 B1 EP 1475145B1 EP 04010919 A EP04010919 A EP 04010919A EP 04010919 A EP04010919 A EP 04010919A EP 1475145 B1 EP1475145 B1 EP 1475145B1
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EP
European Patent Office
Prior art keywords
range
stirrer
blade
bent
section
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
EP04010919A
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German (de)
French (fr)
Other versions
EP1475145A2 (en
EP1475145A3 (en
Inventor
Werner Dipl.-Ing. Himmelsbach
David Eur.-Ing. Houlton
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EKATO Ruehr und Mischtechnik GmbH
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EKATO Ruehr und Mischtechnik GmbH
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Publication of EP1475145A3 publication Critical patent/EP1475145A3/en
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Publication of EP1475145B1 publication Critical patent/EP1475145B1/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
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/112—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades
    • B01F27/1123—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades sickle-shaped, i.e. curved in at least one direction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F2215/00—Auxiliary or complementary information in relation with mixing
    • B01F2215/04—Technical information in relation with mixing
    • B01F2215/0413—Numerical information
    • B01F2215/0418—Geometrical information
    • B01F2215/0422—Numerical values of angles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F2215/00—Auxiliary or complementary information in relation with mixing
    • B01F2215/04—Technical information in relation with mixing
    • B01F2215/0413—Numerical information
    • B01F2215/0418—Geometrical information
    • B01F2215/0431—Numerical size values, e.g. diameter of a hole or conduit, area, volume, length, width, or ratios thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids

Definitions

  • the invention relates to a stirring member, in particular for dispersing gases in liquids, consisting of a plurality of stirring blades, wherein each stirring blade has a forwardly bent portion in the direction of rotation, as it for example US-A-5,316,443 is known.
  • a gas supplied to the liquid to be stirred is dispersed in the smallest possible bubbles in order to create a large surface area for the mass transfer between the gas and the liquid.
  • the invention has for its object to shorten the mixing time, while keeping the power loss low.
  • the bent portion with a Beispie! provided approximately triangular end portion which forms an angle ⁇ to the bent portion, and is directed away from the stirring blade.
  • the angle ⁇ may be in the range of about 0 ° to 45 °, preferably in the range of about 10 ° to 30 °.
  • this section is formed at the rear end of the stirring blade seen in the direction of rotation.
  • the bent portion is seen in the radial direction in the outer region and is e.g. formed extending to the outer peripheral edge of the stirring blade.
  • the ratio of the radial length L1 of the bent portion to the radial length L2 of the entire stirring blade is in the range of about 0.2 to 1.0, preferably in the range of about 0.4 to 0.6.
  • the ratio of the width B1 of the bent portion to the width B2 of the entire stirring blade is in the range of about 0.1 to 1, preferably in the range of about 0.15 to 0.4.
  • the agitating blade is set to the plane of rotation at an angle ⁇ , which is in the range of about 10 ° to 45 °, preferably in the range of about 20 ° to 30 °.
  • the angle ⁇ between the bent portion and the stirring blade in the range of about 10 ° to 45 °, preferably in the range of about 20 ° to 30 °.
  • the ratio of radius of curvature R1 of the bent portion to outer radius R2 of the stirring blade is in the range of about 0 to 0.3, preferably in the range of about 0.01 to 0.15.
  • the stirring blade is provided at its seen in the direction of rotation front end with an end portion which is bent at an angle ⁇ to the stirring blade and on the plane of the bent portion.
  • the angle ⁇ may be in the range of about 0 ° to +/- 40 °, preferably in the range of about 0 ° to +/- 15 °.
  • the ratio of the width B4 of the bent portion to the total width B2 of the stirring blade is in the range of about 0 to 0.5, preferably in the range of about 0.1 to 0.3.
  • the ratio of radial length L3 of the approximately triangular end portion to the radial length L4 of the bent portion is about 0 to 1.0, preferably about 0.5 to 1.0.
  • the ratio of width B3 of the approximately triangular end portion to the width B1 of the bent portion is about 0.05 to 0.75, preferably about 0.2 to 0.6.
  • FIG. 1 shows a plan view of an agitation system 10 with a hub 12 for attachment of the agitation system 10 to a stirrer shaft (not shown).
  • stirrer blades 14 are fixedly connected by means of brackets 16, which are arranged at angular intervals of 120 ° to each other.
  • the stirring blades 14 can also be attached directly to a stirrer shaft.
  • the three illustrated stirring blades 14 are only an example, and two or more stirring blades may be attached to the hub 12.
  • the axis of the agitator shaft, not shown, is at 18, the outer radius of the Rownblatter 14 is R2 and the direction of rotation is in the clockwise direction and is designated by the arrow P.
  • the brackets 16 may extend transversely but also at an acute or obtuse angle to the axis 18.
  • Each agitating blade 14 is provided with a rotationally forwardly deflected portion 20 formed at the rear end portion of the stirring blade 14 in the rotational direction and extending radially over a portion of the radial length of the agitating blade 14, e.g. extends to the outer peripheral edge.
  • the ratio of the radial length L1 of the bent portion 20 to the radial length L2 of the entire stirring blade 14 is, for example, in the range of about 0.2 to 1.0, and more preferably in the range of about 0.4 to 0.6.
  • the ratio of the width B1 of the bent portion 20 to the total width B2 of the stirring blade 14 is, for example, in the range of about 0.1 to 1.0, and more preferably in the range of about 0.15 to 0.4.
  • the bent portion 20 is formed of a curved portion 26 having a radius of curvature R1 and an adjoining particular planar part 28, which may optionally be curved, however.
  • the ratio of this radius of curvature R1 to the outer radius R2 of the stirring blade 14 is for example in the range of about 0 to 0.3, and in particular in the range of about 0.01 to 0.15.
  • the bent portion 20, with respect to the vertical axis of rotation 18, extends upward, and then substantially forward in the direction of rotation of the stirring element 10.
  • Each bent portion 20 is preferably provided at its front end in the direction of rotation with an approximately triangular end portion 22, for example, which forms an angle ⁇ to the part 28 of the bent portion 20, and which is directed away from the stirring blade 14.
  • the angle ⁇ is suitably in the range of about 0 ° to 45 °, and in particular in the range of about 10 ° to 30 °.
  • the tip of the triangular end portion is radially outwardly directed in the illustrated example, but it may also be directed inwardly.
  • the ratio of the radial length L3 of the approximately triangular end portion 22 to the radial length L4 of the bent portion is suitably about 0 to 1.0, and more preferably about 0.5 to 1.0.
  • the ratio of the width B3 of the end portion 22 to the width B1 of the bent portion 20 is approximately in the range of 0.05 to 0.75, and more preferably in the range of about 0.2 to 0.6.
  • the stirring blade 14 is set at an angle ⁇ to the plane of rotation D which lies in the range of approximately 10 ° to 45 °, and in particular in the range of approximately 20 ° to 30 °.
  • the bent portion 20, 28 forms the stirring blade 14 at an angle ⁇ , which is for example in the range of about 10 ° to 45 °, and in particular in the range of about 20 ° to 30 °.
  • Each agitating blade 14 may have at its front end viewed in the direction of rotation an end portion 24 which is bent at an angle ⁇ to the agitating blade 14 and to the plane of the bent portion 20, 28, the angle ⁇ being in the range of about 0 °, for example can be up to +/- 40 °, and in particular in the range of about 0 ° to +/- 15 °.
  • the ratio of the width B4 (seen in the circumferential direction) of the bent end portion 24 to the total width B2 of the stirring blade 14 is suitably in the range of about 0 to 0.5, and in particular in the range of about 0.1 to 0.3.
  • the crease line between the parts 14 and 24 extends in the example shown transversely to the outer edge of the stirring blade 14, but it may also include an angle thereto.
  • the viewed in the direction of rotation front of the end portion 24 may, as shown, rounded and / or beveled, the chamfer may be formed in particular in the radially outer region of the stirring blade 14.
  • the stirrer according to the invention allows a good reduction in the mixing time with good dispersion quality and only a slight decrease in performance. Due to the larger area of the stirring blades 14 relative to the surface of the bent
  • Sections 20, 28 is achieved that the radial pumping action is eccentric and has an axial component.
  • the combination of axial and radial flow patterns leads to significantly lower mixing times in the stirred tank. Since the approximately box-shaped shape of the bent portions 20, 28, the formation of gas cushioning behind the stirring blades can be substantially avoided, power losses are reduced in the dispersion of gases. Finally, a better heat transfer is achieved by the strong radial flow than in the axial flow.
  • the stirrer according to the invention thus combines the advantages of radially pumping and axially pumping stirrers.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Mixers With Rotating Receptacles And Mixers With Vibration Mechanisms (AREA)
  • Percussion Or Vibration Massage (AREA)
  • Ultra Sonic Daignosis Equipment (AREA)

Abstract

A stirring unit has a number of stirring blades (14) where each has a section (20) bent forwards in the direction of rotation, at the trailing end of the blade and in a radially outer zone. The ratio of the radial length (L1) of the bent section to the total radial length (L2) of the stirring blade is 0.2-1.0 and preferably 0.4-0.6. The ratio of the width (B1) of the bent section to the total width (B2) of the stirring blade is 0.1-1.0 and preferably 0.15-0.4.

Description

Die Erfindung betrifft ein Rührorgan, insbesondere zum Dispergieren von Gasen in Flüssigkeiten, bestehend aus einer Mehrzahl von Rührblättern, wobei jedes Rührblatt einen in Drehrichtung nach vorn abgebogenen Abschnitt aufweist, wie es beispielsweise aus US-A-5 316 443 bekannt ist.The invention relates to a stirring member, in particular for dispersing gases in liquids, consisting of a plurality of stirring blades, wherein each stirring blade has a forwardly bent portion in the direction of rotation, as it for example US-A-5,316,443 is known.

Mittels eines derartigen Rührorgans wird ein der zu rührenden Flüssigkeit zugeführtes Gas in möglichst kleine Blasen dispergiert, um eine große Oberfläche für den Stoffübergang zwischen dem Gas und der Flüssigkeit zu schaffen.By means of such a stirring element, a gas supplied to the liquid to be stirred is dispersed in the smallest possible bubbles in order to create a large surface area for the mass transfer between the gas and the liquid.

Gegenüber bekannten Rührern dieser Art liegt der Erfindung die Aufgabe zugrunde, die Mischzeit zu verkürzen, dabei aber den Leistungsabfall gering zu halten.Compared to known stirrers of this type, the invention has for its object to shorten the mixing time, while keeping the power loss low.

Gemäß Anspruch 1 der Erfindung ist der abgebogene Abschnitt mit einem zum Beispie! etwa dreieckförmigen Endabschnitt versehen, der einen Winkel γ zum abgebogenen Abschnitt bildet, und vom Rührblatt weg gerichtet ist. Der Winkel γ kann im Bereich von etwa 0° bis 45°, vorzugsweise im Bereich von etwa 10° bis 30° liegen.According to claim 1 of the invention, the bent portion with a Beispie! provided approximately triangular end portion which forms an angle γ to the bent portion, and is directed away from the stirring blade. The angle γ may be in the range of about 0 ° to 45 °, preferably in the range of about 10 ° to 30 °.

Zweckmäßigerweise ist dieser Abschnitt am in Drehrichtung gesehen hinteren Ende des Rührblatts ausgebildet.Appropriately, this section is formed at the rear end of the stirring blade seen in the direction of rotation.

Vorzugsweise ist der abgebogene Abschnitt in radialer Richtung gesehen im äußeren Bereich und sich z.B. bis zum äußeren Umfangsrand des Rührblatts erstreckend ausgebildet.Preferably, the bent portion is seen in the radial direction in the outer region and is e.g. formed extending to the outer peripheral edge of the stirring blade.

Vorzugsweise liegt das Verhältnis von radialer Länge L1 des abgebogenen Abschnitts zur radialen Länge L2 des gesamten Rührblatts im Bereich von etwa 0,2 bis 1,0 vorzugsweise im Bereich von etwa 0,4 bis 0,6.Preferably, the ratio of the radial length L1 of the bent portion to the radial length L2 of the entire stirring blade is in the range of about 0.2 to 1.0, preferably in the range of about 0.4 to 0.6.

Vorteilhafterweise liegt in Umfangsrichtung gesehen das Verhältnis von Breite B1 des abgebogenen Abschnitts zur Breite B2 des gesamten Rührblatts im Bereich von etwa 0,1 bis 1, vorzugsweise im Bereich von etwa 0,15 bis 0,4.Advantageously, in the circumferential direction, the ratio of the width B1 of the bent portion to the width B2 of the entire stirring blade is in the range of about 0.1 to 1, preferably in the range of about 0.15 to 0.4.

Zweckmäßigerweise ist das Rührblatt zur Drehebene in einem Winkel α angestellt, der im Bereich von etwa 10° bis 45°, vorzugsweise im Bereich von etwa 20° bis 30° liegt.Conveniently, the agitating blade is set to the plane of rotation at an angle α, which is in the range of about 10 ° to 45 °, preferably in the range of about 20 ° to 30 °.

Zweckmäßigerweise liegt der Winkel β zwischen dem abgebogenen Abschnitt und dem Rührblatt im Bereich von etwa 10° bis 45°, vorzugsweise im Bereich von etwa 20° bis 30°.Conveniently, the angle β between the bent portion and the stirring blade in the range of about 10 ° to 45 °, preferably in the range of about 20 ° to 30 °.

Zweckmäßigerweise liegt das Verhältnis von Krümmungsradius R1 des abgebogenen Abschnitts zum Außenradius R2 des Rührblatts im Bereich von etwa 0 bis 0,3, vorzugsweise im Bereich von etwa 0,01 bis 0,15.Conveniently, the ratio of radius of curvature R1 of the bent portion to outer radius R2 of the stirring blade is in the range of about 0 to 0.3, preferably in the range of about 0.01 to 0.15.

Vorzugsweise ist das Rührblatt an seinem in Drehrichtung gesehen vorderen Ende mit einem Endabschnitt versehen, der in einem Winkel δ zum Rührblatt und auf die Ebene des abgebogenen Abschnitts zu abgeknickt ist. Der Winkel δ kann im Bereich von etwa 0° bis +/- 40°, vorzugsweise im Bereich von etwa 0° bis +/- 15° liegen.Preferably, the stirring blade is provided at its seen in the direction of rotation front end with an end portion which is bent at an angle δ to the stirring blade and on the plane of the bent portion. The angle δ may be in the range of about 0 ° to +/- 40 °, preferably in the range of about 0 ° to +/- 15 °.

Vorteilhafterweise liegt in Umfangsrichtung gesehen das Verhältnis von Breite B4 des abgeknickten Abschnitts zur Gesamtbreite B2 des Rührblatts im Bereich von etwa 0 bis 0,5, vorzugsweise im Bereich von etwa 0,1 bis 0,3.Advantageously, in the circumferential direction, the ratio of the width B4 of the bent portion to the total width B2 of the stirring blade is in the range of about 0 to 0.5, preferably in the range of about 0.1 to 0.3.

Zweckmäßigerweise beträgt das Verhältnis von radialer Länge L3 des etwa dreieckförmigen Endabschnitts zur radialen Länge L4 des abgebogenen Abschnitts etwa 0 bis 1,0, vorzugsweise etwa 0,5 bis 1,0.Conveniently, the ratio of radial length L3 of the approximately triangular end portion to the radial length L4 of the bent portion is about 0 to 1.0, preferably about 0.5 to 1.0.

Vorteilhafterweise beträgt das Verhältnis von Breite B3 des etwa dreieckförmigen Endabschnitts zur Breite B1 des abgebogenen Abschnitts etwa 0,05 bis 0,75, vorzugsweise etwa 0,2 bis 0,6.Advantageously, the ratio of width B3 of the approximately triangular end portion to the width B1 of the bent portion is about 0.05 to 0.75, preferably about 0.2 to 0.6.

Eine beispielsweise Ausführungsform der Erfindung wird nachfolgend an Hand der Zeichnung erläutert, in der

Fig 1
eine Draufsicht, und
Fig. 2
eine Seitenansicht des erfindungsgemäßen Rührorgans zeigen.
An exemplary embodiment of the invention will be explained below with reference to the drawing, in which
Fig. 1
a plan view, and
Fig. 2
show a side view of the stirring element according to the invention.

Figur 1 zeigt in Draufsicht ein Rührorgan 10 mit einer Nabe 12 zur Befestigung des Rührorgans 10 an einer nicht dargestellten Rührwelle.FIG. 1 shows a plan view of an agitation system 10 with a hub 12 for attachment of the agitation system 10 to a stirrer shaft (not shown).

Mit der Nabe 12 sind mittels Halterungen 16 drei Rührblatter 14 fest verbunden, die in Winkelabständen von 120° zueinander angeordnet sind. Die Rührblätter 14 können aber auch direkt an einer Rührwelle angebracht sein.With the hub 12 three stirrer blades 14 are fixedly connected by means of brackets 16, which are arranged at angular intervals of 120 ° to each other. The stirring blades 14 can also be attached directly to a stirrer shaft.

Die drei dargestellten Rührblatter 14 stellen nur ein Beispiel dar, es können auch zwei oder mehr Rührblätter an der Nabe 12 angebracht sein. Die Achse der nicht dargestellten Rührwelle ist mit 18, der Außenradius der Rührblatter 14 ist mit R2 und die Drehrichtung erfolgt in Uhrzeigerrichtung und ist mit dem Pfeil P bezeichnet. Die Halterungen 16 können quer aber auch in einem spitzen oder stumpfen Winkel geneigt zur Achse 18 verlaufen.The three illustrated stirring blades 14 are only an example, and two or more stirring blades may be attached to the hub 12. The axis of the agitator shaft, not shown, is at 18, the outer radius of the Rührblatter 14 is R2 and the direction of rotation is in the clockwise direction and is designated by the arrow P. The brackets 16 may extend transversely but also at an acute or obtuse angle to the axis 18.

Jedes Rührblatt 14 ist mit einem in Drehrichtung nach vorne abgebogenen Abschnitt 20 versehen, der am in Drehrichtung hinteren Endbereich des Rührblatts 14 ausgebildet ist, und sich in radialer Richtung über einen Teil der radialen Länge des Rührblatts 14 z.B. bis zu dessen äußerem Umfangsrand erstreckt.Each agitating blade 14 is provided with a rotationally forwardly deflected portion 20 formed at the rear end portion of the stirring blade 14 in the rotational direction and extending radially over a portion of the radial length of the agitating blade 14, e.g. extends to the outer peripheral edge.

Das Verhältnis der radialen Länge L1 des abgebogenen Abschnitts 20 zur radialen Länge L2 des gesamten Rührblatts 14 liegt beispielsweise im Bereich von etwa 0,2 bis 1,0, und insbesondere im Bereich von etwa 0,4 bis 0,6.The ratio of the radial length L1 of the bent portion 20 to the radial length L2 of the entire stirring blade 14 is, for example, in the range of about 0.2 to 1.0, and more preferably in the range of about 0.4 to 0.6.

In Umfangsrichtung gesehen liegt das Verhältnis der Breite B1 des abgebogenen Abschnitts 20 zur Gesamtbreite B2 des Rührblatts 14 zum Beispiel im Bereich von etwa 0,1 bis 1,0, und insbesondere im Bereich von etwa 0,15 bis 0,4.In the circumferential direction, the ratio of the width B1 of the bent portion 20 to the total width B2 of the stirring blade 14 is, for example, in the range of about 0.1 to 1.0, and more preferably in the range of about 0.15 to 0.4.

Der abgebogene Abschnitt 20 wird gebildet aus einem gekrümmten Teil 26 mit einem Krümmungsradius R1 und einem sich daran anschließenden insbesondere ebenen Teil 28, der gegebenenfalls aber auch gekrümmt ausgebildet sein kann.The bent portion 20 is formed of a curved portion 26 having a radius of curvature R1 and an adjoining particular planar part 28, which may optionally be curved, however.

Das Verhältnis dieses Krümmungsradius R1 zum Außenradius R2 des Rührblatts 14 liegt beispielsweise im Bereich von etwa 0 bis 0,3, und insbesondere im Bereich von etwa 0,01 bis 0,15. Vom Rührblatt 14 ausgehend erstreckt sich der abgebogene Abschnitt 20, bezogen auf die vertikale Drehachse 18, nach oben, und danach im wesentlichen nach vorn in Drehrichtung des Rührorganes 10.The ratio of this radius of curvature R1 to the outer radius R2 of the stirring blade 14 is for example in the range of about 0 to 0.3, and in particular in the range of about 0.01 to 0.15. Starting from the stirring blade 14, the bent portion 20, with respect to the vertical axis of rotation 18, extends upward, and then substantially forward in the direction of rotation of the stirring element 10.

Jeder abgebogene Abschnitt 20 ist an seinem in Drehrichtung vorderen Ende vorzugsweise mit einem zum Beispiel etwa dreieckförmigen Endabschnitt 22 versehen, der einen Winkel γ zum Teil 28 des abgebogenen Abschnittes 20 bildet, und der vom Rührblatt 14 weg gerichtet ist. Der Winkel γ liegt zweckmäßigerweise im Bereich von etwa 0° bis 45°, und insbesondere im Bereich von etwa 10° bis 30°.Each bent portion 20 is preferably provided at its front end in the direction of rotation with an approximately triangular end portion 22, for example, which forms an angle γ to the part 28 of the bent portion 20, and which is directed away from the stirring blade 14. The angle γ is suitably in the range of about 0 ° to 45 °, and in particular in the range of about 10 ° to 30 °.

Die Spitze des dreieckförmigen Endabschnitts ist im dargestellten Beispiel radial nach außen gerichteten, sie kann aber auch nach innen gerichtet sein.The tip of the triangular end portion is radially outwardly directed in the illustrated example, but it may also be directed inwardly.

Das Verhältnis der radialen Länge L3 des etwa dreieckförmigen Endabschnitts 22 zur radialen Länge L4 des abgebogenen Abschnitts beträgt zweckmäßigerweise etwa 0 bis 1,0, und insbesondere etwa 0,5 bis 1,0.The ratio of the radial length L3 of the approximately triangular end portion 22 to the radial length L4 of the bent portion is suitably about 0 to 1.0, and more preferably about 0.5 to 1.0.

Das Verhältnis der Breite B3 des Endabschnitts 22 zur Breite B1 des abgebogenen Abschnitts 20 liegt etwa im Bereich von 0,05 bis 0,75, und insbesondere im Bereich von etwa 0,2 bis 0,6.The ratio of the width B3 of the end portion 22 to the width B1 of the bent portion 20 is approximately in the range of 0.05 to 0.75, and more preferably in the range of about 0.2 to 0.6.

Wie Figur 2 zeigt, ist das Rührblatt 14 zur Drehebene D in einem Winkel α angestellt, der im Bereich von etwa 10° bis 45°, und insbesondere im Bereich von etwa 20° bis 30° liegt.As FIG. 2 shows, the stirring blade 14 is set at an angle α to the plane of rotation D which lies in the range of approximately 10 ° to 45 °, and in particular in the range of approximately 20 ° to 30 °.

Der abgebogene Abschnitt 20, 28 bildet zum Rührblatt 14 einen Winkel β, der zum Beispiel im Bereich von etwa 10° bis 45°, und insbesondere im Bereich von etwa 20° bis 30° liegt.The bent portion 20, 28 forms the stirring blade 14 at an angle β, which is for example in the range of about 10 ° to 45 °, and in particular in the range of about 20 ° to 30 °.

Jedes Rührblatt 14 kann an seinem in Drehrichtung gesehenen vorderen Ende einen Endabschnitt 24 aufweisen, der in einem Winkel δ zum Rührblatt 14 und auf die Ebene des abgebogenen Abschnitts 20, 28 zu abgeknickt ist, wobei der Winkel δ zum Beispiel im Bereich von etwa 0° bis +/- 40°, und insbesondere im Bereich von etwa 0° bis +/- 15° liegen kann.Each agitating blade 14 may have at its front end viewed in the direction of rotation an end portion 24 which is bent at an angle δ to the agitating blade 14 and to the plane of the bent portion 20, 28, the angle δ being in the range of about 0 °, for example can be up to +/- 40 °, and in particular in the range of about 0 ° to +/- 15 °.

Das Verhältnis der Breite B4 (in Umfangsrichtung gesehen) des abgeknickten Endabschnitts 24 zur Gesamtbreite B2 des Rührblatts 14 liegt zweckmäßigerweise im Bereich von etwa 0 bis 0,5, und insbesondere im Bereich von etwa 0,1 bis 0,3.The ratio of the width B4 (seen in the circumferential direction) of the bent end portion 24 to the total width B2 of the stirring blade 14 is suitably in the range of about 0 to 0.5, and in particular in the range of about 0.1 to 0.3.

Die Knicklinie zwischen den Teilen 14 und 24 verläuft im dargestellten Beispiel quer zum Außenrand des Rührblatts 14, sie kann aber auch einen Winkel hierzu einschließen. Die in Drehrichtung gesehene Vorderseite des Endabschnitts 24 kann, wie dargestellt, abgerundet und/oder abgeschrägt sein, wobei die Abschrägung insbesondere im radial äußeren Bereich des Rührblatts 14 ausgebildet sein kann.The crease line between the parts 14 and 24 extends in the example shown transversely to the outer edge of the stirring blade 14, but it may also include an angle thereto. The viewed in the direction of rotation front of the end portion 24 may, as shown, rounded and / or beveled, the chamfer may be formed in particular in the radially outer region of the stirring blade 14.

Das erfindungsgemäße Rührorgan ermöglicht bei guter Dispersionsqualität und nur geringem Leistungsabfall eine deutliche Verkürzung der Mischzeit. Infolge der größeren Fläche der Rührblatter 14 relativ zu der Fläche der abgebogenenThe stirrer according to the invention allows a good reduction in the mixing time with good dispersion quality and only a slight decrease in performance. Due to the larger area of the stirring blades 14 relative to the surface of the bent

Abschnitte 20, 28 wird erreicht, daß die radiale Pumpwirkung exzentrisch ist und eine axiale Komponente hat. Die Kombination von axialen und radialen Fließmustern führt zu deutlich geringeren Mischzeiten im Rührbehälter. Da durch die etwa kastenförmige Gestalt der abgebogenen Abschnitte 20, 28 die Bildung von Gaspolstern hinter den Rührblättern im wesentlichen vermieden werden kann, werden Leistungsverluste beim Dispergieren von Gasen reduziert. Schließlich wird durch die starke radiale Strömung ein besserer Wärmetransport als bei axialer Strömung erreicht. Das erfindungsgemäße Rührorgan kombiniert somit die Vorteile radial pumpender und axial pumpender Rührorgane.Sections 20, 28 is achieved that the radial pumping action is eccentric and has an axial component. The combination of axial and radial flow patterns leads to significantly lower mixing times in the stirred tank. Since the approximately box-shaped shape of the bent portions 20, 28, the formation of gas cushioning behind the stirring blades can be substantially avoided, power losses are reduced in the dispersion of gases. Finally, a better heat transfer is achieved by the strong radial flow than in the axial flow. The stirrer according to the invention thus combines the advantages of radially pumping and axially pumping stirrers.

Claims (14)

  1. Stirrer, particularly for the dispersion of gases within fluids, consisting of a number of stirrer blades (14), whereby each blade (14) is provided with a section bent forwards in the direction of rotation (20). It is characterised by a bent section (20) provided with an approximately triangular section (22) on the leading edge in the direction of rotation, which makes an angle (γ) with the flat part (28) of the bent section (20) and is directed away from the stirrer blade (14).
  2. Stirrer according to claim 1, characterised by the bent section (20) provided at the rear part of the stirrer blade (14) (considered from the direction of rotation).
  3. Stirrer according to claim 1 or 2, characterised by the bent section (20) provided on the outer part of the stirrer blade (14) (in a radial direction).
  4. Stirrer according to any of the previous claims, characterised by the ratio of the radial length (L1) of the bent section (20) to the total radial length (L2) of the stirrer blade (14) being in the range 0.2 to 1.0 and preferably in the range 0.4 to 0.6.
  5. Stirrer according to any of the previous claims, characterised by the ratio of the width (B1) of the bent section (20) to the total width (B2) of the stirrer blade (14) (in the circumferential direction) being in the range 0.1 to 1.0 and preferably in the range 0.15 to 0.4.
  6. Stirrer according to any of the previous claims, characterised by the ratio of the radius of curvature (R1) of the bent section (20, 26) to the outer radius (R2) of the stirrer blade (14) being in the range 0 to 0.3, and preferably in the range 0.01 to 0.15.
  7. Stirrer according to any of the previous claims, characterised by the angle (γ) being in the range 0° to 45° and preferably in the range 10° to 30°.
  8. Stirrer according to any of the previous claims, characterised by the ratio of the radial length (L3) of the approximately triangular end section (22) to the radial length (L4) of the bent section (20) being around 0 to 1.0 and preferably around 0.5 to 1.0.
  9. Stirrer according to any of the previous claims, characterised by the ratio of the width (B3) of the end section (22) to the width (B4) of the bent section (20) being around 0.05 to 0.75 and preferably 0.2 to 0.6.
  10. Stirrer according to any of the previous claims, characterised by the stirrer blade (14) making an angle (α) with the axis of rotation (D) in the range 10° to 45° and preferably in the range 20° to 30°.
  11. Stirrer according to any of the previous claims, characterised by the bent section (20, 28) making an angle (β) with the stirrer blade (14) in the range 10° to 45° and preferably in the range 20° to 30°.
  12. Stirrer according to any of the previous claims, characterised by the leading end of the stirrer blade (14) (considered from the direction of rotation) being provided with an end section (24), which is bent at an angle (δ) with the stirrer blade (14) in the plane of the bent section (20, 28).
  13. Stirrer according to claim 12, characterised by the angle (δ) being around 0°± 45° and preferably lying in the region 0° ± 15°.
  14. Stirrer according to claims 12 and 13, characterised by the ratio of the width (B4) of the bent end section (24) to the total width (B2) of the stirrer blade (14) being in the range 0 to 0.5, and preferably in the range 0.1 to 0.3.
EP04010919A 2003-05-08 2004-05-07 Impeller Expired - Lifetime EP1475145B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE20307199U 2003-05-08
DE20307199U DE20307199U1 (en) 2003-05-08 2003-05-08 stirrer

Publications (3)

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EP1475145A2 EP1475145A2 (en) 2004-11-10
EP1475145A3 EP1475145A3 (en) 2005-01-19
EP1475145B1 true EP1475145B1 (en) 2007-10-10

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EP (1) EP1475145B1 (en)
AT (1) ATE375198T1 (en)
DE (2) DE20307199U1 (en)
DK (1) DK1475145T3 (en)

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Also Published As

Publication number Publication date
US7296925B2 (en) 2007-11-20
DE502004005173D1 (en) 2007-11-22
DK1475145T3 (en) 2008-02-11
EP1475145A2 (en) 2004-11-10
DE20307199U1 (en) 2003-07-10
EP1475145A3 (en) 2005-01-19
ATE375198T1 (en) 2007-10-15
US20040228210A1 (en) 2004-11-18

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