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EP0847799A1 - Impeller - Google Patents

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Publication number
EP0847799A1
EP0847799A1 EP97121866A EP97121866A EP0847799A1 EP 0847799 A1 EP0847799 A1 EP 0847799A1 EP 97121866 A EP97121866 A EP 97121866A EP 97121866 A EP97121866 A EP 97121866A EP 0847799 A1 EP0847799 A1 EP 0847799A1
Authority
EP
European Patent Office
Prior art keywords
stirring
stirring element
element according
approximately
angled
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.)
Granted
Application number
EP97121866A
Other languages
German (de)
French (fr)
Other versions
EP0847799B1 (en
Inventor
Peter Dipl.-Ing. Forschner
Rainer Dr.-Ing. Krebs
Hans-Jürgen Dipl.-Ing. Weiss
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.)
EKATO Ruehr und Mischtechnik GmbH
Original Assignee
EKATO Ruehr und Mischtechnik GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
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Publication of EP0847799A1 publication Critical patent/EP0847799A1/en
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Publication of EP0847799B1 publication Critical patent/EP0847799B1/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
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/233—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements
    • 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
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/233—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements
    • B01F23/2336—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements characterised by the location of the place of introduction of the gas relative to the stirrer
    • B01F23/23362—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements characterised by the location of the place of introduction of the gas relative to the stirrer the gas being introduced under the stirrer
    • 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
    • B01F27/115—Stirrers characterised by the configuration of the stirrers comprising discs or disc-like elements essentially perpendicular to the stirrer shaft axis
    • B01F27/1152—Stirrers characterised by the configuration of the stirrers comprising discs or disc-like elements essentially perpendicular to the stirrer shaft axis with separate elements other than discs fixed on the discs, e.g. vanes fixed on the discs
    • 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
    • B01F33/80—Mixing plants; Combinations of mixers
    • B01F33/82—Combinations of dissimilar mixers
    • B01F33/822—Combinations of dissimilar mixers with moving and non-moving stirring devices in the same receptacle
    • 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
    • B01F27/1125—Stirrers characterised by the configuration of the stirrers with arms, paddles, vanes or blades with vanes or blades extending parallel or oblique to the stirrer axis
    • 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
    • B01F27/115—Stirrers characterised by the configuration of the stirrers comprising discs or disc-like elements essentially perpendicular to the stirrer shaft axis

Definitions

  • the invention relates to an agitator, in particular a gassing agitator for stirring liquids containing a gas Example air is supplied with a hub for attachment an agitator shaft, a support disc connected to the hub the peripheral edge of which is attached to a plurality of stirring blades.
  • one of the stirrers is to be stirred Liquid supplied gas dispersed in small bubbles, to have a large surface for the mass transfer between to create the gas and the liquid.
  • Such a gassing stirrer usually comprises a disc stirrer with stirring blades and an annular gas distributor, circular holes are formed along the apex line thereof, which feed the gas to the rotating disc stirrer, through the Shear effect the gas is dispersed further.
  • the stirrer is created on the back of the Stirring blades a negative pressure, which there to form gas cushions leads.
  • These gas cushions give the stirring blades a better flow Contour that results in a sharp drop in performance given speed.
  • the invention is based on the object of an agitator create that these aforementioned disadvantages in any case in essentially eliminated.
  • this is achieved in that the stirring blades angled wedge-shaped in the direction of movement (direction of rotation) are trained.
  • the wedge angle is advantageously about 45 ° to 75 °, preferably about 60 °.
  • each wedge-shaped stirring blade are advantageously in front Angled in the direction of the rotary movement of the stirring element.
  • each leg and its angled End section is preferably about 120 ° to 160 °, especially at about 140 °.
  • the end sections are expediently triangular, with its width increasing radially from the outside inwards.
  • the radial length of the end sections can advantageously be about two thirds to three quarters of the radial length of the Stirring blade amount.
  • the support disk for the stirring blades from the stirring level downwards angled or bent such that under the washer Cavity is formed.
  • the gas can be removed using a simple Pipe are introduced into the cavity under the support plate, which simplifies the gas supply. Also constipation in the presence of solids or in the formation of Solids avoided.
  • the support disk is preferably curved, stepped, conical or in particular conical.
  • the cone opening angle is advantageously about 140 ° to 150 °, in particular about 146 °.
  • the support disk is preferably with in particular triangular teeth provided in the Tapered surface area or up or relative to this can be angled downwards.
  • the gas supply is expediently in the area of the cone tip the conical support disc.
  • FIG. 1 shows a top view of a stirring element 10 with a hub 12 for fastening the stirring element 10 to a not shown Agitator shaft.
  • the Agitator 10 has a central axis 32. This rotates during operation Stirring element 10 in the direction of arrow P around the stirrer axis central axis 32.
  • the level of rotation or stirring level 30 lies transversely to the stirring axis 32.
  • the support disk 14 is conical, the fictitious cone tip expediently in the Stirring axis 32 lies.
  • the support disk 14 can also in other ways, for example graded, conical or curved, as long as below it the cavity 36 is formed.
  • FIG. 2 shows, there is a supply pipe 28 for the gas supply in the Cavity 36 introduced, the mouth 38 conveniently below the fictitious cone tip and concentric to the stirring axis 32 lies.
  • the support plate 14 is on its outer Circumferential edge 40 with, in particular, triangular prongs 26 provided that apart from the attachment points of the stirring blades 16 along the entire circumference of the support disk 14 run.
  • the prongs 26 are expediently in the surface of the cone shell 34 (or form part of this), they but can also up or down relative to the cone shell 34 be turned.
  • prongs 26 forming a ring of peaks are uniform Gas leakage and improve the dispersion of the over the Feed pipe 28 in the cavity 36 introduced gas, or with in other words, they help break up the gas bubbles.
  • Figure 3 shows a plan view of the blank, that is given sheet metal blank of a stirring blade 16 before this in his Operating form is bent.
  • the blank 42 is approximately trapezoidal in shape and has on its outside (related to the later working position) one Width B1 of, for example, 40mm and one on the inside Width B2 of, for example, 50mm.
  • the radial length L1 of the Blank 42 is, for example, 37 to 38mm. (Of course the invention is not based on this only as an example mentioned dimensions.)
  • the blank 42 becomes wedge-shaped along its center line 44 bent such that the two legs 18 and 20 of the wedge enclose an angle ⁇ , as shown in FIG. 4.
  • the wedge angle ⁇ expediently lies approximately in the range from 45 ° to 75 °, and he is preferably about 60 °.
  • End sections 22 and 24 of the two legs 18 and 20 are longitudinal of the bending lines 46 and 48 and based on that in FIG. 3 shown position of the blank 42 upwards by an angle ⁇ ( Figure 4) bent.
  • the angle ⁇ between the respective end section 22, 24 and its associated leg 18, 20 is expediently in Range from about 120 ° to 160 ° and is preferably about 140 °.
  • the end sections 22, 24 are essentially triangular formed, and their width increases in the radial direction from the The outside of the stirring blade is towards the inside of the stirring blade.
  • On the inside of the stirring blade 50 in this example is the width B3 End section 22, 24 about 12.5 mm, but this dimension only is an example to which the invention is not limited.
  • the Length L2 of the end sections 22, 24, measured from the inside of the stirring blade 50 off, can expediently about two thirds to amount to three quarters of the radial length L1 of the stirring blade 16, while the width B3 of the end portions 22, 24 on the inside of the stirring blade 50 about 20% to 30%, preferably about 25%, the total width B2 of the stirring blade blank 42 can be.

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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)

Abstract

A stirring element (10), especially a gasing stirring element for stirring liquids and introducing a gas, preferably air, to the liquids. The stirring element has a hub (12) for attachment to a stirring shaft and a support disk (14) joined to the hub (12), a plurality of stirring blades (16) being attached to a peripheral edge of the support disk (14). To achieve a low output power coefficient, each stirring blade (16) is made of a wedge-shape that is directed in the direction of rotary motion of the stirring element (10). Preferably, radially inner end sections (22, 24) of two sides (18, 20) of the stirring blade (16) are angled relative to sides (18, 20) outwardly with reference to the direction of rotary motion of the stirring element (10). The stirring element (10) simplifies gas feed and prevents clogs. By providing the support disk (14) with a conical shape having a ring of teeth (26) on its outer edge, a uniform distribution and good dispersion of the gas bubbles is obtainable.

Description

Die Erfindung betrifft ein Rührorgan, insbesondere ein Begasungs-Rührorgan zum Rühren von Flüssigkeiten, denen ein Gas, zum Beispiel Luft, zugeführt wird, mit einer Nabe zur Befestigung an einer Rührwelle, einer mit der Nabe verbundenen Tragscheibe, an deren Umfangsrand eine Mehrzahl von Rührblättern angebracht ist.The invention relates to an agitator, in particular a gassing agitator for stirring liquids containing a gas Example air is supplied with a hub for attachment an agitator shaft, a support disc connected to the hub the peripheral edge of which is attached to a plurality of stirring blades.

Mittels eines Begasungs-Rührorganges 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 a gassing stirrer one of the stirrers is to be stirred Liquid supplied gas dispersed in small bubbles, to have a large surface for the mass transfer between to create the gas and the liquid.

Gewöhnlich umfaßt ein solches Begasungs-Rührorgan einen Scheibenrührer mit Rührblättern und einen ringförmigen Gasverteiler, längs dessen Scheitellinie kreisförmige Löcher ausgebildet sind, die das Gas dem rotierenden Scheibenrührer zuführen, durch dessen Scherwirkung das Gas weiter dispergiert wird. Durch die Rotationsbewegung des Rührorganes entsteht aber auf der Rückseite der Rührblätter ein Unterdruck, der dort zur Bildung von Gaspolstern führt. Diese Gaspolster geben den Rührblättern eine strömungsgünstigere Kontur, die sich in einem starken Leistungsabfall bei gegebener Drehzahl äußert.Such a gassing stirrer usually comprises a disc stirrer with stirring blades and an annular gas distributor, circular holes are formed along the apex line thereof, which feed the gas to the rotating disc stirrer, through the Shear effect the gas is dispersed further. By the rotational movement the stirrer is created on the back of the Stirring blades a negative pressure, which there to form gas cushions leads. These gas cushions give the stirring blades a better flow Contour that results in a sharp drop in performance given speed.

Da für den Stoffübergang aber zwei Parameter, nämlich die Gasmenge und der Leistungseintrag durch das Rührvorgang bestimmend sind, muß, um die Einstellung des gewünschten Stoffüberganges beherrschen zu können, durch eine Drehzahlsteigerung das Defizit der Leistungsreduzierung ausgeglichen werden. Dies bedingt einen erheblichen regelungstechnischen und apparativen Aufwand.Since there are two parameters for the mass transfer, namely the Determining the amount of gas and the power input through the stirring process are to adjust the desired mass transfer to be able to control it by increasing the speed Deficit of the power reduction can be compensated. This requires a considerable amount of control technology and equipment Expenditure.

Der Erfindung liegt nun die Aufgabe zu Grunde, ein Rührorgan zu schaffen, das diese vorgenannten Nachteile jedenfalls im wesentlichen beseitigt.The invention is based on the object of an agitator create that these aforementioned disadvantages in any case in essentially eliminated.

Nach der Erfindung wird dies dadurch erreicht, daß die Rührblätter in Bewegungsrichtung (Drehrichtung) keilförmig abgewinkelt ausgebildet sind.According to the invention, this is achieved in that the stirring blades angled wedge-shaped in the direction of movement (direction of rotation) are trained.

Der Keilwinkel beträgt zweckmäßigerweise etwa 45° bis 75°, vorzugsweise etwa 60°.The wedge angle is advantageously about 45 ° to 75 °, preferably about 60 °.

Die radial inneren Endabschnitte der beiden Schenkel jedes keilförmigen Rührblattes sind vorteilhafterweise nach vorne in Richtung der Drehbewegung des Rührorganes abgewinkelt.The radially inner end portions of the two legs each wedge-shaped stirring blade are advantageously in front Angled in the direction of the rotary movement of the stirring element.

Der Winkel zwischen dem jeweiligen Schenkel und seinem abgewinkelten Endabschnitt liegt vorzugsweise etwa bei 120° bis 160°, insbesondere bei etwa 140°.The angle between each leg and its angled End section is preferably about 120 ° to 160 °, especially at about 140 °.

Die Endabschnitte sind zweckmäßigerweise dreieckförmig ausgebildet, wobei ihre Breite radial von außen nach innen zunimmt. Die radiale Länge der Endabschnitte kann hierbei vorteilhafterweise etwa zwei Drittel bis drei Viertel der radialen Länge des Rührblattes betragen.The end sections are expediently triangular, with its width increasing radially from the outside inwards. The radial length of the end sections can advantageously be about two thirds to three quarters of the radial length of the Stirring blade amount.

Nach einer weiteren Ausgestaltung der Erfindung ist die Tragscheibe für die Rührblätter von der Rührebene aus nach unten abgewinkelt oder abgebogen derart, daß unter der Tragscheibe ein Hohlraum gebildet ist. According to a further embodiment of the invention, the support disk for the stirring blades from the stirring level downwards angled or bent such that under the washer Cavity is formed.

Bei dieser Ausführungsform kann das Gas mittels eines einfachen Rohres in den Hohlraum unter der Tragscheibe eingeleitet werden, wodurch die Gaszufuhr vereinfacht wird. Auch werden Verstopfungen beim Vorhandensein von Feststoffen oder bei der Bildung von Feststoffen vermieden.In this embodiment, the gas can be removed using a simple Pipe are introduced into the cavity under the support plate, which simplifies the gas supply. Also constipation in the presence of solids or in the formation of Solids avoided.

Vorzugsweise ist die Tragscheibe gewölbt, abgestuft, konisch oder insbesondere kegelförmig ausgebildet.The support disk is preferably curved, stepped, conical or in particular conical.

Der Kegelöffnungswinkel beträgt zweckmäßigerweise etwa 140° bis 150°, insbesondere etwa 146°.The cone opening angle is advantageously about 140 ° to 150 °, in particular about 146 °.

An ihrem äußeren Umfangsrand ist die Tragscheibe vorzugsweise mit insbesondere dreieckförmigen Zacken versehen, die in der Kegelmantelfläche liegen oder relativ zu dieser nach oben oder nach unten abgewinkelt sein können.At its outer peripheral edge, the support disk is preferably with in particular triangular teeth provided in the Tapered surface area or up or relative to this can be angled downwards.

Die Gaszufuhr erfolgt zweckmäßigerweise im Bereich der Kegelspitze der kegeligen Tragscheibe.The gas supply is expediently in the area of the cone tip the conical support disc.

Eine beispielsweise Ausführungsform der Erfindung wird nachfolgend an Hand der Zeichnungen erläutert. Darin zeigt:

Fig. 1
eine schematische Draufsicht auf das neuerungsgemäße Rührorgan.
Fig. 2
schematisch einen Längsschnitt durch die Mittelachse des Rührorganes nach Figur 1,
Fig. 3
eine Draufsicht auf ein Rührblatt des Rührorganes im noch ebenen, ungebogenen Zustand, und
Fig. 4
schematisch eine Ansicht des fertig bearbeiteten Rührblattes in Richtung des Pfeiles A in Figur 1.
An example embodiment of the invention is explained below with reference to the drawings. It shows:
Fig. 1
is a schematic plan view of the inventive stirring element.
Fig. 2
schematically shows a longitudinal section through the central axis of the stirring element according to Figure 1,
Fig. 3
a plan view of a stirring blade of the stirring element in the still flat, unbent state, and
Fig. 4
schematically shows a view of the finished blade in the direction of arrow A in Figure 1.

Figur 1 zeigt in Draufsicht ein Rührorgan 10 mit einer Nabe 12 zur Befestigung des Rührorganes 10 an einer nicht dargestellten Rührwelle.FIG. 1 shows a top view of a stirring element 10 with a hub 12 for fastening the stirring element 10 to a not shown Agitator shaft.

Mit der Nabe 12 fest verbunden ist eine Tragscheibe 14, an deren äußerem Umfangsrand mehrere, im wesentlichen radial nach außen sich erstreckende Rührblätter 16 fest angebracht sind. Das Rührorgan 10 hat eine Mittelachse 32. Im Betrieb dreht sich das Rührorgan 10 in Richtung des Pfeiles P um diese die Rührachse bildende Mittelachse 32.With the hub 12 is fixedly attached to a support disk 14 outer peripheral edge several, essentially radially outwards extending stirring blades 16 are fixed. The Agitator 10 has a central axis 32. This rotates during operation Stirring element 10 in the direction of arrow P around the stirrer axis central axis 32.

Die Drehebene oder Rührebene 30 liegt quer zur Rührachse 32.The level of rotation or stirring level 30 lies transversely to the stirring axis 32.

Wie Figur 2 zeigt, ist die Tragscheibe 14 kegelförmig ausgebildet, wobei die fiktive Kegelspitze zweckmäßigerweise in der Rührachse 32 liegt. Der Kegelmantel 34 erstreckt sich von der Nabe 12 weg nach unten und er bildet mit der Rührebene 30 einen Winkel δ von zum Beispiel 17°. In diesem Fall beträgt der Kegelöffnungswinkel γ = 146°. Zweckmäßigerweise kann aber der Kegelöffnungswinkel γ im Bereich von etwa 140° bis 150° liegen.As FIG. 2 shows, the support disk 14 is conical, the fictitious cone tip expediently in the Stirring axis 32 lies. The cone jacket 34 extends from the Hub 12 away downwards and it forms one with the stirring plane 30 Angle δ of, for example, 17 °. In this case the Taper opening angle γ = 146 °. Conveniently, however, the Cone opening angle γ are in the range of about 140 ° to 150 °.

Unterhalb der kegeligen Tragscheibe 14 und unterhalb der Nabe 12 wird somit ein Hohlraum 36 gebildet.Below the tapered support disk 14 and below the hub 12 a cavity 36 is thus formed.

Die Tragscheibe 14 kann auch in anderer Weise, zum Beispiel abgestuft, konisch oder gewölbt ausgebildet sein, so lange nur unter ihr der Hohlraum 36 gebildet wird.The support disk 14 can also in other ways, for example graded, conical or curved, as long as below it the cavity 36 is formed.

Wie Figur 2 zeigt, ist ein Zufuhrrohr 28 für die Gaszufuhr in den Hohlraum 36 eingeführt, dessen Mündung 38 zweckmäßigerweise unterhalb der fiktiven Kegelspitze und konzentrisch zur Rührachse 32 liegt.As FIG. 2 shows, there is a supply pipe 28 for the gas supply in the Cavity 36 introduced, the mouth 38 conveniently below the fictitious cone tip and concentric to the stirring axis 32 lies.

Wie Figur 1 zeigt, ist die Tragscheibe 14 an ihrem äußeren Umfangsrand 40 mit insbesondere dreieckförmigen Zacken 26 versehen, die abgesehen von den Befestigungsstellen der Rührblätter 16 längs des gesamten Umfanges der Tragscheibe 14 verlaufen. Die Zacken 26 liegen zweckmäßigerweise in der Fläche des Kegelmantels 34 (bzw. bilden einen Teil von diesem), sie können aber auch relativ zum Kegelmantel 34 nach oben oder unten abgebogen sein.As Figure 1 shows, the support plate 14 is on its outer Circumferential edge 40 with, in particular, triangular prongs 26 provided that apart from the attachment points of the stirring blades 16 along the entire circumference of the support disk 14 run. The prongs 26 are expediently in the surface of the cone shell 34 (or form part of this), they but can also up or down relative to the cone shell 34 be turned.

Diese einen Zackenkranz bildenden Zacken 26 vergleichmäßigen den Gasaustritt und verbessern die Dispergierung des über das Zufuhrrohr 28 in den Hohlraum 36 eingeführten Gases, oder mit anderen Worten, sie unterstützen die Zerteilung der Gasblasen.These prongs 26 forming a ring of peaks are uniform Gas leakage and improve the dispersion of the over the Feed pipe 28 in the cavity 36 introduced gas, or with in other words, they help break up the gas bubbles.

Figur 3 zeigt eine Draufsicht auf den Zuschnitt, das heißt den gegebenen Blech-Rohling eines Rührblattes 16, ehe dieses in seine Betriebs-Form gebogen wird.Figure 3 shows a plan view of the blank, that is given sheet metal blank of a stirring blade 16 before this in his Operating form is bent.

Der Rohling 42 ist etwa trapezförmig gestaltet und er hat an seiner Außenseite (bezogen auf die spätere Arbeitsposition) eine Breite B1 von zum Beispiel 40mm und an seiner Innenseite eine Breite B2 von zum Beispiel 50mm. Die radiale Länge L1 des Rohlings 42 liegt beispielsweise bei 37 bis 38mm. (Selbstverständlich ist die Erfindung nicht auf diese nur als Beispiel genannten Maße beschränkt.)The blank 42 is approximately trapezoidal in shape and has on its outside (related to the later working position) one Width B1 of, for example, 40mm and one on the inside Width B2 of, for example, 50mm. The radial length L1 of the Blank 42 is, for example, 37 to 38mm. (Of course the invention is not based on this only as an example mentioned dimensions.)

Längs seiner Mittellinie 44 wird der Rohling 42 keilförmig abgebogen derart, daß die beiden Schenkel 18 und 20 des Keiles einen Winkel α umschließen, wie Figur 4 zeigt. Der Keilwinkel α liegt zweckmäßigerweise etwa im Bereich von 45° bis 75°, und er beträgt vorzugsweise etwa 60°.The blank 42 becomes wedge-shaped along its center line 44 bent such that the two legs 18 and 20 of the wedge enclose an angle α, as shown in FIG. 4. The wedge angle α expediently lies approximately in the range from 45 ° to 75 °, and he is preferably about 60 °.

Die in radialer Richtung A (Figuren 1 und 3) gesehen inneren Endabschnitte 22 und 24 der beiden Schenkel 18 und 20 sind längs der Biegelinien 46 bzw. 48 und bezogen auf die in Figur 3 dargestellte Lage des Rohlings 42 nach oben um einen Winkel β (Figur 4) abgebogen. The inner seen in the radial direction A (Figures 1 and 3) End sections 22 and 24 of the two legs 18 and 20 are longitudinal of the bending lines 46 and 48 and based on that in FIG. 3 shown position of the blank 42 upwards by an angle β (Figure 4) bent.

Der Winkel β zwischen dem jeweiligen Endabschnitt 22, 24 und seinem zugehörigen Schenkel 18, 20 liegt zweckmäßigerweise im Bereich von etwa 120° bis 160° und er beträgt vorzugsweise etwa 140°.The angle β between the respective end section 22, 24 and its associated leg 18, 20 is expediently in Range from about 120 ° to 160 ° and is preferably about 140 °.

Bezogen auf die Drehrichtung P des Rührorganes 10 (Figuren 1 und 4) sind die Endabschnitte 22, 24 relativ zu den Schenkeln 18, 20 nach vorne in Richtung der Drehbewegung des Rührorganes 10 abgewinkelt, wie Figur 4 zeigt.Relative to the direction of rotation P of the agitator 10 (Figures 1 and 4) the end sections 22, 24 are relative to the legs 18, 20 forward in the direction of the rotary movement of the stirring element 10 angled, as Figure 4 shows.

Die Endabschnitte 22, 24 sind im wesentlichen dreieckförmig ausgebildet, und ihre Breite nimmt in radialer Richtung von der Rührblattaußenseite zur Rührblattinnenseite zu. An der Rührblattinnenseite 50 beträgt in diesem Beispiel die Breite B3 der Endabschnitt 22, 24 etwa 12,5mm, wobei auch diese Maßangabe nur ein Beispiel ist, auf das die Erfindung nicht beschränkt ist. Die Länge L2 der Endabschnitte 22, 24, gemessen von der Rührblattinnenseite 50 aus, kann zweckmäßigerweise etwa zwei Drittel bis drei Viertel der radialen Länge L1 des Rührblattes 16 betragen, während die Breite B3 der Endabschnitte 22, 24 an der Rührblattinnenseite 50 etwa 20 % bis 30 %, vorzugsweise etwa 25 %, der Gesamtbreite B2 des Rührblatt-Rohrlings 42 betragen kann.The end sections 22, 24 are essentially triangular formed, and their width increases in the radial direction from the The outside of the stirring blade is towards the inside of the stirring blade. On the inside of the stirring blade 50 in this example is the width B3 End section 22, 24 about 12.5 mm, but this dimension only is an example to which the invention is not limited. The Length L2 of the end sections 22, 24, measured from the inside of the stirring blade 50 off, can expediently about two thirds to amount to three quarters of the radial length L1 of the stirring blade 16, while the width B3 of the end portions 22, 24 on the inside of the stirring blade 50 about 20% to 30%, preferably about 25%, the total width B2 of the stirring blade blank 42 can be.

Mit dem erefindungsgemäßen Rührorgan wird ein niedriger Ausgangsleistungsbeiwert erreicht. Die Gaszufuhr wird vereinfacht und es werden Verstopfungen vermieden. Ferner ermöglicht die kegelförmige Ausbildung der Tragscheibe und ihr Zackenkranz an ihrem Außenrand eine gleichmäßige Verteilung und gute Dispergierung der Gasblasen.With the stirrer according to the invention, a low output coefficient is achieved reached. The gas supply is simplified and it blockages are avoided. Furthermore, the cone-shaped Training the support disc and her spiked ring on her Even distribution and good dispersion of the outer edge Gas bubbles.

Claims (12)

Rührorgan, insbesondere Begasungs-Rührorgan zum Rühren von Flüssigkeiten, denen ein Gas, zum Beispiel Luft, zugeführt wird, mit einer Nabe (12) zur Befestigung an einer Rührwelle, einer mit der Nabe (12) verbundenen Tragscheibe (14), an deren Umfangsrand eine Mehrzahl von Rührblättern (16) angebracht ist, dadurch gekennzeichnet, daß jedes Rührblatt (16) in Bewegungsrichtung keilförmig abgewinkelt ausgebildet ist.Stirring element, in particular gassing stirrer for stirring liquids to which a gas, for example air, is supplied, with a hub (12) for attachment to a stirrer shaft, a support disc (14) connected to the hub (12), on the peripheral edge thereof a plurality of stirring blades (16) is attached, characterized in that each stirring blade (16) is angled in a wedge shape in the direction of movement. Rührorgan nach Anspruch 1, dadurch gekennzeichnet, daß der Keilwinkel (α) des Rührblattes (16) etwa 45° bis 75°, vorzugsweise etwa 60° beträgt.Stirring element according to claim 1, characterized in that the wedge angle (α) of the stirring blade (16) is approximately 45 ° to 75 °, preferably approximately 60 °. Rührorgan nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die radial inneren Endabschnitte (22, 24) der beiden Schenkel (18, 20) des Rührblattes (16) relativ zu den Schenkeln (18, 20) nach vorne in Richtung der Drehbewegung des Rührorganes (10) abgewinkelt sind.Stirring element according to claim 1 or 2, characterized in that the radially inner end sections (22, 24) of the two legs (18, 20) of the stirring blade (16) relative to the legs (18, 20) forward in the direction of the rotational movement of the stirring element (10) are angled. Rührorgan nach Anspruch 3, dadurch gekennzeichnet, daß der Winkel (β) zwischen dem jeweiligen Schenkel (18) bzw. (20) und seinem abgewinkelten Endabschnitt (22 bzw. 24) etwa 120° bis 160°, vorzugsweise etwa 140° beträgt. Stirring element according to claim 3, characterized in that the angle (β) between the respective leg (18) or (20) and its angled end section (22 or 24) is approximately 120 ° to 160 °, preferably approximately 140 °. Rührorgan nach Anspruch 3 oder 4, dadurch gekennzeichnet, daß die Endabschnitte (22, 24) dreieckförmig ausgebildet sind und ihre Breite radial von außen nach innen zunimmt.Stirring element according to claim 3 or 4, characterized in that the end sections (22, 24) are triangular and their width increases radially from the outside inwards. Rührorgan nach einem der Ansprüche 3 bis 5, dadurch gekennzeichnet, daß die radiale Länge (L2) der Endabschnitte etwa zwei Drittel bis drei Viertel der radialen Länge (L1) des Rührblattes (16) beträgt, und daß die Breite (B3) jedes Endabschnittes (22, 24) etwa 20 % bis 30 %, vorzugsweise etwa 25 % der Breite (B2) des Rührblattes (16) beträgt.Stirring element according to one of claims 3 to 5, characterized in that the radial length (L2) of the end sections is approximately two thirds to three quarters of the radial length (L1) of the stirring blade (16), and in that the width (B3) of each end section ( 22, 24) is about 20% to 30%, preferably about 25% of the width (B2) of the stirring blade (16). Rührorgan nach Anspruch 1, dadurch gekennzeichnet, daß die Tragscheibe (14) für die Rührblätter (16) von der Nabe (12) weg nach unten abgewinkelt oder abgebogen ist derart, daß unter ihr ein Hohlraum (36) gebildet ist.Stirring element according to claim 1, characterized in that the support disk (14) for the stirring blades (16) is angled or bent downwards away from the hub (12) such that a cavity (36) is formed below it. Rührorgan nach Anspruch 7, dadurch gekennzeichnet, daß die Tragscheibe (14) gewölbt, abgestuft, konisch oder insbesondere kegelförmig ausgebildet ist.Stirring element according to claim 7, characterized in that the supporting disc (14) is curved, stepped, conical or, in particular, conical. Rührorgan nach Anspruch 8, dadurch gekennzeichnet, daß der Kegelöffnungswinkel (γ) der Tragscheibe (14) etwa 140° bis 150°, insbesondere etwa 146° beträgt.Stirring element according to claim 8, characterized in that the cone opening angle (γ) of the supporting disc (14) is approximately 140 ° to 150 °, in particular approximately 146 °. Rührorgan nach Anspruch 7, 8 oder 9, dadurch gekennzeichnet, daß die Tragscheibe (14) an ihrem Außenrand (40) mit insbesondere dreieckförmigen Zacken (26) versehen ist.Stirring element according to claim 7, 8 or 9, characterized in that the support disc (14) is provided on its outer edge (40) with in particular triangular prongs (26). Rührorgan nach Anspruch 10, dadurch gekennzeichnet, daß die Zacken (26) in der Kegelmantelfläche (34) liegen oder relativ zu dieser abgewinkelt sind.Stirring element according to claim 10, characterized in that the teeth (26) lie in the conical surface (34) or are angled relative to the latter. Rührorgan nach Anspruch 1 und 7, dadurch gekennzeichnet, daß das Gas mittels eines Zufuhrrohres (28) in den Hohlraum (36) unter der kegeligen Tragscheibe (14) einführbar ist.Stirring device according to claims 1 and 7, characterized in that the gas can be introduced into the cavity (36) under the conical supporting disc (14) by means of a feed pipe (28).
EP97121866A 1996-12-13 1997-12-11 Impeller Expired - Lifetime EP0847799B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE29621683U DE29621683U1 (en) 1996-12-13 1996-12-13 Stirrer
DE29621683U 1996-12-13

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EP0847799A1 true EP0847799A1 (en) 1998-06-17
EP0847799B1 EP0847799B1 (en) 2000-09-20

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US9108170B2 (en) 2011-11-24 2015-08-18 Li Wang Mixing impeller having channel-shaped vanes
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Also Published As

Publication number Publication date
DK0847799T3 (en) 2001-01-29
ATE196432T1 (en) 2000-10-15
DE29621683U1 (en) 1997-02-13
US5904423A (en) 1999-05-18
DE59702379D1 (en) 2000-10-26
EP0847799B1 (en) 2000-09-20

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