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EP0079396A1 - Propeller for a rotating mixer - Google Patents

Propeller for a rotating mixer Download PDF

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Publication number
EP0079396A1
EP0079396A1 EP81109661A EP81109661A EP0079396A1 EP 0079396 A1 EP0079396 A1 EP 0079396A1 EP 81109661 A EP81109661 A EP 81109661A EP 81109661 A EP81109661 A EP 81109661A EP 0079396 A1 EP0079396 A1 EP 0079396A1
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EP
European Patent Office
Prior art keywords
mixing
propeller
constant
tool
point
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.)
Withdrawn
Application number
EP81109661A
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German (de)
French (fr)
Inventor
Hans Kimmel
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Individual
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Individual
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Publication date
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Priority to EP81109661A priority Critical patent/EP0079396A1/en
Publication of EP0079396A1 publication Critical patent/EP0079396A1/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

Definitions

  • Mixing and stirring tools rotating around an axis of rotation in particular for mixers and stirrers in chemical process engineering, have so far only been determined in their shape according to certain influences which they are intended to exert on the material to be treated.
  • Mixing tools are already known which produce certain desired flow conditions in the container holding the material to be treated.
  • Other known mixing tools and their associated drive are dimensioned such that the same impact speeds prevail at all points where the material to be treated and the mixing tool collide.
  • the invention has for its object to provide a mixing or stirring tool of the type mentioned, which wears evenly in operation at all points where it comes into contact with the material to be treated.
  • F is an arbitrary function of r, ⁇ and z.
  • a mixing or stirring tool according to the present invention has such a surface curvature that the partial derivatives of the surface function are constant, ie independent of r, ⁇ and z, according to the coordinate running in the axis of rotation z and the coordinate ⁇ , or in other words and are the same size in every point of the mixing or stirring tool, although of course from can distinguish.
  • FIG. 1 shows this in a perspective view
  • FIG. 2 shows the geometric shape of the upper or lower boundary line of a mixing blade of the mixing tool according to FIG. 1.
  • the mixing tool according to FIG. 1 is intended to set the mixture in a mixing container in such a way that the components of the mixture movement running parallel to the axis of rotation of the mixing tool are constant over the radius.
  • the wear of the mixing tool should be the same at all points in order to achieve the object on which the invention is based.
  • the mixing tool shown has two mixing blades 1. These mixing blades are attached to a hub 2, the radius of which is r 0 .
  • the impingement surfaces 3 of the mixing blades are inclined relative to the horizontal in such a way that when the mixing tool rotates in the direction of arrow A, a movement component is generated in the mix that is parallel to the rotation axis and is directed upwards.
  • each impact surface 3 is defined according to FIG. 2 by a circular involute, the beginning of which lies on the hub 2 with the radius r 0 .
  • the screw line is designated C in Fig. 1.
  • the involute line can also be curved in the opposite direction and / or the screwing direction can also be reversed. In any case, the above two requirements for the properties of the mixing tool are met.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)

Abstract

The propeller is optimised with respect to wear. This is achieved by a design which meets the requirements delta F/ delta Z = constant and delta F/ delta phi = constant for all surface points. <IMAGE>

Description

Um eine Drehachse umlaufende Misch- und Rührwerkzeuge, insbesondere für Mischer und Rührer der chemischen Verfahrenstechnik, wurden in ihrer Formgebung bislang ausschließlich nach bestimmten Einflüssen, die sie auf das zu behandelnde Gut ausüben sollen, festgelegt. So sind bereits Mischwerkzeuge bekannt, die im das zu behandelnde Gut aufnehmenden Behälter bestimmte gewünschte Strömungsverhältnisse erzeugen. Andere bekannte Mischwerkzeuge und ihr zugehöriger Antrieb sind derart dimensioniert, daß an allen Stellen, an denen das zu behandelnde Gut und das Mischwerkzeug aufeinanderprallen, gleiche Aufprallgeschwindigkeiten herrschen.Mixing and stirring tools rotating around an axis of rotation, in particular for mixers and stirrers in chemical process engineering, have so far only been determined in their shape according to certain influences which they are intended to exert on the material to be treated. Mixing tools are already known which produce certain desired flow conditions in the container holding the material to be treated. Other known mixing tools and their associated drive are dimensioned such that the same impact speeds prevail at all points where the material to be treated and the mixing tool collide.

Jedes Mischwerkzeug ist Verschleiß unterworfen, hervorgerufen durch Abrieb. Dem hat man in der Vergangenheit durch Auswahl geeigneter Materialien oder durch Auflagen aus abriebfesten Materialien an den besonders gefährdeten Stellen des Mischwerkzeug zu begegnen versucht. Beides ist vom technischen und wirtschaftlichen Gesichtspunkt unbefriedigend.Every mixing tool is subject to wear, caused by abrasion. In the past, attempts have been made to counter this by selecting suitable materials or by using abrasion-resistant materials at the particularly vulnerable points on the mixing tool. Both are unsatisfactory from a technical and economic point of view.

Der Erfindung liegt die Aufgabe zugrunde, ein Misch- oder Rührwerkzeug der eingangs genannten Art anzugeben, das im Betrieb an allen Stellen, an denen es mit dem zu behandelnden Gut in Berührung tritt, gleichmäßig verschleißt.The invention has for its object to provide a mixing or stirring tool of the type mentioned, which wears evenly in operation at all points where it comes into contact with the material to be treated.

Diese Aufgabe wird durch die kennzeichnenden Merkmale des Patentanspruchs gelöst.This object is achieved by the characterizing features of the patent claim.

Die Erfindung sei anschließend in ihren allgemeinen Merkmalen näher erläutert.The invention is then explained in more detail in its general features.

Bezeichnet man die Fläche eines rotierenden Mischwerkzeugs, die mit zu behandelndem Gut in Berührung tritt, mit F, dann läßt sich diese Fläche in einem Zylinderkoordinatensystem als F = F (r ϕ, z) darstellen, wobei r der Abstand eines bestimmten Flächenpunktes zur Umlaufachse, der Winkel zwischen der axialen Projektion dieses Punktes auf eine Radialebene und einem radial verlaufenden Bezugsstrahl und z die Höhe des Punktes gegenüber einer Radialbezugsebene ist. F ist eine zunächst beliebige Funktion von r , ϕ und z.If one designates the area of a rotating mixing tool that comes into contact with the material to be treated with F, then this area can be represented in a cylindrical coordinate system as F = F (r ϕ, z ), where r is the distance of a certain area point to the circumferential axis, is the angle between the axial projection of this point on a radial plane and a radially extending reference beam and z is the height of the point with respect to a radial reference plane. F is an arbitrary function of r, ϕ and z.

Ein Misch- oder Rührwerkzeug nach der vorliegenden Erfindung hat eine solche Flächenkrümmung, daß die partiellen Ableitungen der-Flächenfunktion nach der in Rotationsachsrichtung z verlaufenden Koordinate und nach der Koordinate ϕ konstant, d.h. unabhängig von r, ϕ und z sind, oder anders ausgedrückt

Figure imgb0001
und
Figure imgb0002
sind in jedem Punkt des Misch- oder Rührwerkzeugs gleich groß, wobei freilich
Figure imgb0003
 sich von
Figure imgb0004
unterscheiden kann.A mixing or stirring tool according to the present invention has such a surface curvature that the partial derivatives of the surface function are constant, ie independent of r, ϕ and z, according to the coordinate running in the axis of rotation z and the coordinate ϕ, or in other words
Figure imgb0001
 and
Figure imgb0002
 are the same size in every point of the mixing or stirring tool, although of course
Figure imgb0003
 from
Figure imgb0004
 can distinguish.

Es gibt bei einem so dimensionierten Mischwerkzeug keinen Punkt, der einem besonders hohen Verschleiß unterworfen wäre.With such a mixing tool, there is no point that is subject to particularly high wear.

Die genannten Bedingungen erfüllen eine unendlich große Anzahl von Mischwerkzeugen, da die Flächenkrümmung immer noch unabhängig von der Koordinate r ist. Damit steht ein Parameter zur freien Disposition, der es erlaubt, das Mischwerkzeug außerdem auch noch hinsichtlich anderer Anforderungen zu dimensionieren, beispielsweise um bestimmte gewünschte Strömungsverhältnisse in dem in einem Behälter befindlichen Mischgut zu erzeugen.The conditions mentioned satisfy an infinite number of mixing tools, since the surface curvature is still independent of the coordinate r. With that comes one Free disposition parameters, which also allow the mixing tool to be dimensioned with regard to other requirements, for example in order to generate certain desired flow conditions in the mixed material located in a container.

In den Zeichnungen ist schematisch ein Ausführungsbeispiel eines erfindungsgemäßen Mischwerkzeuges dargestellt. Fig. 1 zeigt dieses in perspeltivischer Darstellung, während Fig. 2 die geometrische Gestalt von oberer bzw. unterer Begrenzungslinie eines Mischflügels des Mischwerkzeugs nach Fig. 1 zeigt.An exemplary embodiment of a mixing tool according to the invention is shown schematically in the drawings. FIG. 1 shows this in a perspective view, while FIG. 2 shows the geometric shape of the upper or lower boundary line of a mixing blade of the mixing tool according to FIG. 1.

Das Mischwerkzeug nach Fig. 1 ist dazu bestimmt, in einem Mischbehälter befindliches Mischgut derart in Bewegung zu setzen, daß die parallel zur Umlaufachse des Mischwerkzeugs verlaufenden Komponenten der Mischgutbewegung über den Radius gesehen konstant sind. Darüber hinaus soll die Verschleißbeanspruchung des Mischwerkzeugs in Erfüllung der der Erfindung zugrundeliegenden Aufgabe an allen Stellen gleich groß sein.The mixing tool according to FIG. 1 is intended to set the mixture in a mixing container in such a way that the components of the mixture movement running parallel to the axis of rotation of the mixing tool are constant over the radius. In addition, the wear of the mixing tool should be the same at all points in order to achieve the object on which the invention is based.

Das dargestellte Mischwerkzeug weist zwei Mischflügel 1 auf. Diese Mischflügel sind an einer Nabe 2 befestigt, deren Radius r0 ist. Die Aufprallflächen 3 der Mischflügel sind gegen die Horizontale derart geneigt, daß bei Umlauf des Mischwerkzeugs in Richtung des Pfeiles A im Mischgut eine Bewegungskomponente parallel zur Umlaufachse erzeugt wird, die nach oben gerichtet ist.The mixing tool shown has two mixing blades 1. These mixing blades are attached to a hub 2, the radius of which is r 0 . The impingement surfaces 3 of the mixing blades are inclined relative to the horizontal in such a way that when the mixing tool rotates in the direction of arrow A, a movement component is generated in the mix that is parallel to the rotation axis and is directed upwards.

Die obere und die untere Begrenzungslinie B jeder Aufprallfläche 3 ist gemäß Fig. 2 durch eine Kreisevolvente definiert, deren Anfang auf der Nabe 2 mit dem Radius r0 liegt. Die Verschraubungslinie ist in Fig. 1 mit C bezeichnet.The upper and lower boundary line B of each impact surface 3 is defined according to FIG. 2 by a circular involute, the beginning of which lies on the hub 2 with the radius r 0 . The screw line is designated C in Fig. 1.

Je nach Wunsch und Verwendungszweck kann die Evolventenlinie auch in entgegengesetzter Richtung gekrümmt sein und/oder kann die Verschraubungsrichtung auch umgekehrt sein. Es werden in jedem Fall die zuvor genannten zwei Forderungen an die Eigenschaften des Mischwerkzeugs erfüllt.Depending on the request and the intended use, the involute line can also be curved in the opposite direction and / or the screwing direction can also be reversed. In any case, the above two requirements for the properties of the mixing tool are met.

Claims (1)

Flügel für ein rotierendes Misch- und Rührwerkzeug, dessen mit dem zu behandelnden Gut in Berührung tretende Flügelfläche durch die Zylinderkoordinaten γ,ϕ und
Figure imgb0005
bestimmt ist, mit γ= Abstand eines Flächenpunktes von der Rotationsachse, ϕ= Winkel zwischen einem den Flächenpunkt schneidenden Radius und einem Bezugsradius und
Figure imgb0006
= Abstand zwischen dem Flächenpunkt und einer radialen Bezugsebene, dadurch gekennzeichnet, daß die partiellen Ableitungen der Flügelfläche F für alle Flächenpunkte den Bedingungen
Figure imgb0007
= konstant und
Figure imgb0008
 = konstant genügen.Wing for a rotating mixing and stirring tool, the wing surface of which comes into contact with the material to be treated by the cylinder coordinates γ, ϕ and
Figure imgb0005
is determined with γ = distance of a surface point from the axis of rotation, ϕ = angle between a radius intersecting the surface point and a reference radius and
Figure imgb0006
= Distance between the surface point and a radial reference plane, characterized in that the partial derivatives of the wing surface F for all surface points the conditions
Figure imgb0007
 = constant and
Figure imgb0008
 = constant enough.
EP81109661A 1981-11-12 1981-11-12 Propeller for a rotating mixer Withdrawn EP0079396A1 (en)

Priority Applications (1)

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EP81109661A EP0079396A1 (en) 1981-11-12 1981-11-12 Propeller for a rotating mixer

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EP81109661A EP0079396A1 (en) 1981-11-12 1981-11-12 Propeller for a rotating mixer

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EP0079396A1 true EP0079396A1 (en) 1983-05-25

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2157185A (en) * 1984-04-11 1985-10-23 Gen Signal Corp Mixing systems
GB2192807A (en) * 1986-07-18 1988-01-27 Nat Res Dev Impellers
EP0323375A1 (en) * 1987-12-30 1989-07-05 MORITZ, Société Anonyme Stirring device for mixing devices for powdery, pasty or granular products
US7473025B1 (en) * 2008-01-31 2009-01-06 Spx Corporation Mixing impeller with spiral leading edge
EP2364770A1 (en) * 2010-03-11 2011-09-14 TEKA Maschinenbau GmbH Tool for mixing device

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE654034C (en) * 1936-02-16 1937-12-09 Paul Theodor Arnemann Dipl Ing Device for mixing liquids as well as solid and liquid substances
US2794628A (en) * 1954-09-29 1957-06-04 Eastman Kodak Co Propeller agitators and the dispersing of materials therewith
DE2356008B2 (en) * 1972-11-13 1976-11-04 Scan Blandningsteknik AB, Täby (Schweden) PROPELLER
DE2624991A1 (en) * 1975-06-04 1976-12-16 Procedes Sem FLUEL STIRRER
DE2627201A1 (en) * 1975-06-18 1976-12-30 Entat Marcel PROPELLERS, IN PARTICULAR FOR MIXERS
DE2525362B2 (en) * 1975-06-06 1977-03-31 Günther Papenmeier KG, Maschinen- und Apparatebau; Kimmel, Hans; 4930 Detmold MIXING BLADES ON A ROTATING MIXING TOOL
DE2503838B2 (en) * 1975-01-30 1981-04-23 Hans 4930 Detmold Kimmel Mixing blades

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE654034C (en) * 1936-02-16 1937-12-09 Paul Theodor Arnemann Dipl Ing Device for mixing liquids as well as solid and liquid substances
US2794628A (en) * 1954-09-29 1957-06-04 Eastman Kodak Co Propeller agitators and the dispersing of materials therewith
DE2356008B2 (en) * 1972-11-13 1976-11-04 Scan Blandningsteknik AB, Täby (Schweden) PROPELLER
DE2503838B2 (en) * 1975-01-30 1981-04-23 Hans 4930 Detmold Kimmel Mixing blades
DE2624991A1 (en) * 1975-06-04 1976-12-16 Procedes Sem FLUEL STIRRER
DE2525362B2 (en) * 1975-06-06 1977-03-31 Günther Papenmeier KG, Maschinen- und Apparatebau; Kimmel, Hans; 4930 Detmold MIXING BLADES ON A ROTATING MIXING TOOL
DE2627201A1 (en) * 1975-06-18 1976-12-30 Entat Marcel PROPELLERS, IN PARTICULAR FOR MIXERS

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2157185A (en) * 1984-04-11 1985-10-23 Gen Signal Corp Mixing systems
GB2192807A (en) * 1986-07-18 1988-01-27 Nat Res Dev Impellers
US4799862A (en) * 1986-07-18 1989-01-24 National Research Development Corporation Impellers
GB2192807B (en) * 1986-07-18 1990-07-25 Nat Res Dev Impellers
EP0323375A1 (en) * 1987-12-30 1989-07-05 MORITZ, Société Anonyme Stirring device for mixing devices for powdery, pasty or granular products
FR2625449A1 (en) * 1987-12-30 1989-07-07 Moritz AGITATOR MOBILE FOR MIXING PRODUCTS OF PULVERULENT, PASTY OR GRANULAR PRODUCTS
US4941750A (en) * 1987-12-30 1990-07-17 Societe Anonyme: Moritz Moving agitator member for apparatus for mixing substances in powder, paste, or granular form
US7473025B1 (en) * 2008-01-31 2009-01-06 Spx Corporation Mixing impeller with spiral leading edge
EP2364770A1 (en) * 2010-03-11 2011-09-14 TEKA Maschinenbau GmbH Tool for mixing device

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