EP3482821B1 - Stirrer - Google Patents

Stirrer Download PDF

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Publication number
EP3482821B1
EP3482821B1 EP17200831.0A EP17200831A EP3482821B1 EP 3482821 B1 EP3482821 B1 EP 3482821B1 EP 17200831 A EP17200831 A EP 17200831A EP 3482821 B1 EP3482821 B1 EP 3482821B1
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EP
European Patent Office
Prior art keywords
agitator
agitating
elements
rotary shaft
agitator according
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.)
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EP17200831.0A
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German (de)
French (fr)
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EP3482821A1 (en
Inventor
Timo Weber
Christoph Kohlbrenner
Dieter Wassmer
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.)
VISCO JET RUEHRSYSTEME GmbH
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Visco Jet Ruehrsysteme 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.)
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Publication date
Priority to PL17200831T priority Critical patent/PL3482821T3/en
Application filed by Visco Jet Ruehrsysteme GmbH filed Critical Visco Jet Ruehrsysteme GmbH
Priority to HUE17200831A priority patent/HUE054132T2/en
Priority to ES17200831T priority patent/ES2874181T3/en
Priority to EP17200831.0A priority patent/EP3482821B1/en
Priority to DK17200831.0T priority patent/DK3482821T3/en
Priority to US16/184,600 priority patent/US11110410B2/en
Priority to RU2018139282A priority patent/RU2716679C1/en
Priority to CN201811330110.9A priority patent/CN109758942B/en
Publication of EP3482821A1 publication Critical patent/EP3482821A1/en
Application granted granted Critical
Publication of EP3482821B1 publication Critical patent/EP3482821B1/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
    • B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
    • B01F27/85—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis with two or more stirrers on separate shafts
    • 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
    • B01F27/116—Stirrers shaped as cylinders, balls or rollers
    • B01F27/1162—Balls
    • 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
    • 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
    • B01F27/07—Stirrers characterised by their mounting on the shaft
    • B01F27/072—Stirrers characterised by their mounting on the shaft characterised by the disposition of the stirrers with respect to the rotating axis
    • B01F27/0726—Stirrers characterised by their mounting on the shaft characterised by the disposition of the stirrers with respect to the rotating axis having stirring elements connected to the stirrer shaft each by a single radial rod, other than open frameworks

Definitions

  • the invention relates to an agitator for mixing and / or homogenizing flowable media with at least two agitating elements.
  • Agitators are used in a wide variety of applications. Possible areas of application include the manufacture of paints and varnishes or the manufacture of beverages and foodstuffs. The manufacture of pharmaceutical products and cosmetics also requires the use of agitators on a regular basis, as is the case with paper and ceramics. Depending on the respective area of application, different agitator arrangements are used for mixing and / or homogenizing or suspending the respective substances. For example, barrel and container agitators are known, which are arranged in or on the respective container, or self-supporting stand agitators. Small to large-volume containers for storage or for the transport of mixtures of substances can also be equipped with a stirrer to prevent segregation during storage or transport. The agitator is matched to the material being stirred and the shape and size of the respective container.
  • Agitators usually comprise a rotating shaft that can be driven by an electric motor, by means of which one or more agitating elements connected non-rotatably to the rotating shaft are moved on a circular path. Inserted in a container with a flowable medium, the agitator elements flow around them due to their movement. In dependence of the shape of the stirring elements, their arrangement in the container and the speed at which the stirring elements are moved, establish certain flow conditions in the stirring material, which cause the stirring material to be thoroughly mixed.
  • the agitating elements known in the prior art comprise tubular bodies through which the material to be mixed flows.
  • cup stirrers have been known for a long time. Such agitators expose the material to be mixed to strong changes in the flow rate, which leads to relatively high mechanical loads on the material to be mixed. Such agitators are only suitable to a limited extent for sensitive mixes. Further developments of these agitators often have agitator elements of relatively complex construction, but adhere to the principle that the material to be mixed flows through the agitator element.
  • the agitator comprises a shaft with arms running perpendicular to the longitudinal axis of the shaft, each of which has a stirring element at its free end.
  • Each agitator consists of a tubular body which is at least partially conical. The conical shape has the effect that the flow cross-section of the tubular body is reduced in the flow direction, ie counter to the direction of rotation, and accordingly causes an increase in the flow speed of a material to be stirred.
  • the longitudinal axis of the agitator is also inclined downwards in the direction of rotation.
  • the stirring material therefore flows through the stirring elements in a laminar manner.
  • the flow inside the agitator elements is forced to reverse by dynamic pressure.
  • the resulting countercurrent should cause that even with a low power consumption of the drive, ie at low movement speeds of the agitator elements, an expansive, yet gentle agitation effect can be achieved.
  • the stirring body for a device for stirring flowable media, the design of which is intended to enable improved mixing of the material to be stirred.
  • the stirring body should be suitable for stirring or mixing highly viscous fluids or a highly viscous, flowable material to be stirred.
  • the stirring body has an outer wall and a bottom at one end of the outer wall, the bottom having at least one opening as a flow cross-section for the material to be stirred.
  • a partial flow of the material to be stirred is detected through the outer wall, which changes direction when it hits the floor. The change in direction causes the material to be stirred to be swirled, in particular to the side of and behind the stirring body.
  • the turbulence in turn ensures that the material to be stirred is thoroughly mixed.
  • From the DE 10 2006 043 498 A1 shows a dispersing machine for the production of powder mixtures with an oppositely designed rotor and stator element pair, which is shaped so that a gap-shaped working volume is formed between rotor and stator, through which the powder suspension flows when the dispersing machine is in operation. In doing so, shear forces are introduced into the powder suspension via the rotations of the rotor, which bring about thorough mixing and / or homogenization of the powder suspension.
  • the proposed dispersing machine should in particular be suitable for the production of homogeneous suspensions in hard metal and cermet manufacture.
  • the mentioned agitators are limited in terms of their applicable speed. At high speeds, the stirring effect drops drastically. Therefore, the power input is limited, which is disadvantageous, for example, when gassing, dispersing, emulsifying or drawing in powder
  • the FR 1 479 166 discloses an agitator according to the preamble of claim 1.
  • the present invention is based on the object of specifying an agitator with agitator elements which, with a simple design, enables improved power input.
  • the invention thus fundamentally breaks away from the concept of agitating elements with a flow.
  • the material to be mixed is stimulated to mix by means of an acceleration and redirection of the flow generated on the container wall.
  • overpressure i.e. pressure forces
  • the construction of the agitator according to the invention enables work very close to the wall without the risk of damaging the container wall.
  • the agitator according to the invention is easy to clean, especially since no material to be mixed can get stuck in the closed agitator elements.
  • the agitator according to the invention enables improved gassing of the product because, because of the essentially undirected flow, hardly any larger gas bubbles form in the product.
  • agitators are preferably shaped identically and of the same size.
  • All agitator elements are attached to the rotating shaft of the agitator by means of support arms.
  • An agitator for mixing and / or homogenizing or suspending flowable media with at least two agitating elements is proposed, each agitating element being connected via a support arm with a hub for connection to a drivable rotary shaft.
  • An arrangement of the agitator elements symmetrical to the axis of rotation of the agitator is preferred. It is further preferred that all agitator elements are arranged at the same distance from the axis of rotation of the agitator.
  • the support arms provided for connecting the agitator elements to the drivable rotary shaft are preferably arranged at the same angular distance from one another and in a common radial plane. This means that the support arms run radially.
  • FIG. 1 a perspective three-dimensional view of an agitator according to the invention.
  • the agitator of the Fig. 1 has three stirring elements 1, each of which is connected to a hub 2 via a support arm 3.
  • the stirring elements 1 are spherical. They are formed by spherical hollow bodies made of metal or plastic, each of which is attached to a radially outward end of a support arm 3.
  • the hub 2 is connected coaxially to the rotary shaft, not shown, of the agitator for common rotation about the axis of rotation of the agitator.
  • the agitators therefore move on a common orbit around the rotating shaft during operation.
  • the invention is not limited to those in the Fig. 1 illustrated embodiment limited.
  • the number of stirring elements 1 and their cross-sectional shape and their arrangement with respect to one another can vary.
  • the invention is not limited to the dimensions selected in the drawing. The specific dimensions result in each case as a function of the intended area of application and are in particular matched to the size of a container holding the material to be stirred.

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

Description

Die Erfindung betrifft ein Rührwerk zum Mischen und / oder Homogenisieren strömungsfähiger Medien mit wenigstens zwei Rührorganen.The invention relates to an agitator for mixing and / or homogenizing flowable media with at least two agitating elements.

Rührwerke finden in den verschiedensten Anwendungsbereichen Einsatz. Als mögliche Anwendungsbereiche seien hier beispielhaft die Herstellung von Farben und Lacken oder die Herstellung von Getränken und Nahrungsmitteln genannt. Auch bei der Herstellung von Pharmaprodukten und Kosmetika bedarf es regelmäßig des Einsatzes von Rührwerken, so auch bei der Papier- und Keramikherstellung. Entsprechend dem jeweiligen Anwendungsbereich werden zum Mischen und / oder Homogenisieren bzw. Suspendieren der jeweiligen Stoffe verschiedene Rührwerksanordnungen eingesetzt. Bekannt sind beispielsweise Fass- und Container-Rührwerke, die in oder an dem jeweiligen Behälter angeordnet werden, oder selbsttragende Stativ-Rührwerke. Auch klein- bis großvolumige Behälter zur Lagerung oder für den Transport von Stoffmischungen können mit einem Rührwerk ausgestattet sein, um eine Entmischung während der Lagerung oder des Transports zu verhindern. Das Rührwerk wird auf das jeweilige Rührgut sowie die Form und die Größe des jeweiligen Behälters abgestimmt.Agitators are used in a wide variety of applications. Possible areas of application include the manufacture of paints and varnishes or the manufacture of beverages and foodstuffs. The manufacture of pharmaceutical products and cosmetics also requires the use of agitators on a regular basis, as is the case with paper and ceramics. Depending on the respective area of application, different agitator arrangements are used for mixing and / or homogenizing or suspending the respective substances. For example, barrel and container agitators are known, which are arranged in or on the respective container, or self-supporting stand agitators. Small to large-volume containers for storage or for the transport of mixtures of substances can also be equipped with a stirrer to prevent segregation during storage or transport. The agitator is matched to the material being stirred and the shape and size of the respective container.

Rührwerke umfassen in der Regel eine elektromotorisch antreibbare Drehwelle, mittels deren ein oder mehrere drehfest mit der Drehwelle verbundene Rührorgane auf einer Kreisbahn bewegt werden. Eingesetzt in einen Behälter mit einem strömungsfähigen Medium werden die Rührorgane aufgrund ihrer Bewegung von dem Medium umströmt. In Abhängigkeit von der Form der Rührorgane, deren Anordnung im Behälter und der Geschwindigkeit, mit der die Rührorgane bewegt werden, stellen sich in dem Rührgut bestimmte Strömungsverhältnisse ein, die eine Durchmischung des Rührgutes bewirken.Agitators usually comprise a rotating shaft that can be driven by an electric motor, by means of which one or more agitating elements connected non-rotatably to the rotating shaft are moved on a circular path. Inserted in a container with a flowable medium, the agitator elements flow around them due to their movement. In dependence of the shape of the stirring elements, their arrangement in the container and the speed at which the stirring elements are moved, establish certain flow conditions in the stirring material, which cause the stirring material to be thoroughly mixed.

Die im Stand der Technik bekannten Rührorgane umfassen Rohrkörper, die von dem Mischgut durchströmt werden.The agitating elements known in the prior art comprise tubular bodies through which the material to be mixed flows.

So sind zum Beispiel Becherrührwerke seit längerem bekannt. Solche Rührwerke setzen das Mischgut starken Änderungen der Strömungsgeschwindigkeit aus, was zu relativ großen mechanischen Beanspruchungen des Mischgutes führt. Für empfindliche Mischgüter eignen sich solche Rührwerke nur eingeschränkt. Fortentwicklungen dieser Rührwerke weisen oft relativ kompliziert gebaute Rührorgane auf, halten aber am Prinzip der Durchströmung des Rührorgans durch das Mischgut fest.For example, cup stirrers have been known for a long time. Such agitators expose the material to be mixed to strong changes in the flow rate, which leads to relatively high mechanical loads on the material to be mixed. Such agitators are only suitable to a limited extent for sensitive mixes. Further developments of these agitators often have agitator elements of relatively complex construction, but adhere to the principle that the material to be mixed flows through the agitator element.

Aus der DE 39 01 894 A1 ist ein Rührwerk bekannt, das bei relativ geringer Bewegungsgeschwindigkeit der Rührorgane eine vollständige Durchmischung eines strömungsfähigen Mediums ermöglichen soll. Das Rührwerk soll dementsprechend auch zur Behandlung empfindlicher Stoffmischungen geeignet sein. Das Rührwerk umfasst eine Welle mit senkrecht zur Wellenlängsachse verlaufenden Armen, die an ihren freien Enden jeweils ein Rührorgan tragen. Jedes Rührorgan besteht aus einem Rohrkörper, der zumindest teilweise konisch verlaufend ausgebildet ist. Der konische Verlauf bewirkt, dass sich der Strömungsquerschnitt des Rohrkörpers in Strömungsrichtung, d.h. entgegen der Drehrichtung, verringert und dementsprechend eine Erhöhung der Strömungsgeschwindigkeit eines hindurchströmenden Rührgutes bewirkt. Die Längsachse des Rührorgans ist zudem in Drehrichtung schräg nach unten gestellt. In der Anlaufphase werden die Rührorgane daher vom Rührgut laminar durchströmt. Sobald sie jedoch eine vorbestimmte Minimalgeschwindigkeit erreicht haben, wird die Strömung im Innern der Rührorgane durch Staudruck zur Umkehr gezwungen. Die daraus resultierende Gegenströmung soll bewirken, dass bereits bei niedriger Leistungsaufnahme des Antriebs, d.h. bei geringen Bewegungsgeschwindigkeiten der Rührorgane, ein raumgreifender und dennoch schonender Rühreffekt erzielt werden kann.From the DE 39 01 894 A1 an agitator is known which is intended to enable a flowable medium to be completely mixed at a relatively low speed of movement of the agitator elements. Accordingly, the agitator should also be suitable for treating sensitive mixtures of substances. The agitator comprises a shaft with arms running perpendicular to the longitudinal axis of the shaft, each of which has a stirring element at its free end. Each agitator consists of a tubular body which is at least partially conical. The conical shape has the effect that the flow cross-section of the tubular body is reduced in the flow direction, ie counter to the direction of rotation, and accordingly causes an increase in the flow speed of a material to be stirred. The longitudinal axis of the agitator is also inclined downwards in the direction of rotation. In the start-up phase, the stirring material therefore flows through the stirring elements in a laminar manner. However, as soon as they have reached a predetermined minimum speed, the flow inside the agitator elements is forced to reverse by dynamic pressure. The resulting countercurrent should cause that even with a low power consumption of the drive, ie at low movement speeds of the agitator elements, an expansive, yet gentle agitation effect can be achieved.

Aus der DE 201 16 967 U1 geht ferner ein Rührkörper für eine Vorrichtung zum Rühren strömungsfähiger Medien hervor, dessen Ausbildung eine verbesserte Durchmischung des Rührgutes ermöglichen soll. Insbesondere soll der Rührkörper zum Rühren bzw. Mischen von hochviskosen Strömungsmitteln bzw. eines hochviskosen strömungsfähigen Rührgutes geeignet sein. Hierzu weist der Rührkörper eine Außenwand und einen Boden an einem Ende der Außenwand auf, wobei der Boden wenigstens eine Öffnung als Strömungsquerschnitt für das Rührgut besitzt. Durch die Außenwand wird eine Teilströmung des Rührgutes erfasst, welche mit Auftreffen auf den Boden eine Richtungsänderung erfährt. Die Richtungsänderung bewirkt eine Verwirbelung des Rührgutes, insbesondere seitlich von und hinter dem Rührkörper. Die Verwirbelung wiederum bewirkt, dass eine gute Durchmischung des Rührgutes erfolgt.From the DE 201 16 967 U1 also shows a stirring body for a device for stirring flowable media, the design of which is intended to enable improved mixing of the material to be stirred. In particular, the stirring body should be suitable for stirring or mixing highly viscous fluids or a highly viscous, flowable material to be stirred. For this purpose, the stirring body has an outer wall and a bottom at one end of the outer wall, the bottom having at least one opening as a flow cross-section for the material to be stirred. A partial flow of the material to be stirred is detected through the outer wall, which changes direction when it hits the floor. The change in direction causes the material to be stirred to be swirled, in particular to the side of and behind the stirring body. The turbulence in turn ensures that the material to be stirred is thoroughly mixed.

Aus der DE 10 2006 043 498 A1 geht eine Dispergiermaschine für die Herstellung von Pulvermischungen mit einem gegengleich ausgebildeten Rotor- und Statorelement-Paar hervor, das so geformt ist, dass zwischen Rotor und Stator ein spaltförmiges Arbeitsvolumen ausgebildet wird, das im Betrieb der Dispergiermaschine von der Pulversuspension durchströmt wird. Dabei werden über die Rotordrehungen Scherkräfte in die Pulversuspension eingebracht, welche eine gute Durchmischung und / oder Homogenisierung der Pulversuspension bewirken. Die vorgeschlagene Dispergiermaschine soll insbesondere zur Herstellung von homogenen Suspensionen in der Hartmetall- und Cermetherstellung geeignet sein.From the DE 10 2006 043 498 A1 shows a dispersing machine for the production of powder mixtures with an oppositely designed rotor and stator element pair, which is shaped so that a gap-shaped working volume is formed between rotor and stator, through which the powder suspension flows when the dispersing machine is in operation. In doing so, shear forces are introduced into the powder suspension via the rotations of the rotor, which bring about thorough mixing and / or homogenization of the powder suspension. The proposed dispersing machine should in particular be suitable for the production of homogeneous suspensions in hard metal and cermet manufacture.

Die genannten Rührwerke sind hinsichtlich ihrer anwendbaren Drehzahl limitiert. Bei hohen Drehzahlen fällt die Rührwirkung drastisch ab, Daher ist der Leistungseintrag begrenzt, was zum Beispiel beim Begasen, Dispergieren, Emulgieren oder beim Pulvereinzug nachteilig istThe mentioned agitators are limited in terms of their applicable speed. At high speeds, the stirring effect drops drastically. Therefore, the power input is limited, which is disadvantageous, for example, when gassing, dispersing, emulsifying or drawing in powder

Die FR 1 479 166 offenbart ein Rührwerk entsprechend dem Oberbegriff des Anspruchs 1.The FR 1 479 166 discloses an agitator according to the preamble of claim 1.

Ausgehend vom vorstehend genannten Stand der Technik liegt der vorliegenden Erfindung die Aufgabe zugrunde, ein Rührwerk mit Rührorganen anzugeben, das bei einfacher Bauweise einen verbesserten Leistungseintrag ermöglicht.Proceeding from the above-mentioned prior art, the present invention is based on the object of specifying an agitator with agitator elements which, with a simple design, enables improved power input.

Zur Lösung der Aufgabe wird ein Rührwerk mit den Merkmalen des Anspruchs 1 vorgeschlagen. Vorteilhafte Weiterbildungen eines erfindungsgemäßen Rührwerks werden in den jeweiligen Unteransprüchen angegeben.To achieve the object, an agitator having the features of claim 1 is proposed. Advantageous further developments of an agitator according to the invention are specified in the respective subclaims.

Das erfindungsgemäße Rührorgan ist kugelähnlich. Darunter wird im Rahmen der Erfindung folgendes verstanden:

  • Das Rührorgan hat eine Aussenfläche, die grundsätzlich (überwiegend) gewölbt ist. Vorzugsweise ist die Aussenfläche insgesamt gewölbt, hat also keine Kanten und keine Spitzen. Das Rührorgan ist grundsätzlich ein Rundkörper.
  • Die Aussenfläche ist geschlossen (hat also keine Öffnungen), so dass das Rührorgan nur aussenseitig (mit seiner Aussenfläche) in Kontakt mit dem Mischgut tritt. Das schließt nicht aus, dass bei nicht streng kugelförmiger Ausbildung des Rührorgans Einwölbungen oder dgl. der Aussenfläche vorgesehen werden.
  • Das Rührorgan kann, muss aber nicht, symmetrisch geformt sein. Vorzugsweise ist das Rührorgan im geometrischen Sinne kugelförmig, es kann aber auch ein Ellipsoid oder ein nicht symmetrisch geformter, ähnlicher Rundkörper sein.
  • Wenn das Rührorgan nicht streng kugelförmig ist, hat es einen maximalen und einen minimalen Radius, wobei der maximale Radius größer ist als der minimale Radius. Vorzugsweise ist der Größenunterschied dieser Radien nicht größer als 5, und besonders bevorzugt ist der maximale Radius weniger als doppelt so groß wie der minimale Radius.
  • Das Rührorgan kann ein Hohlkörper sein oder aus massivem Werkstoff bestehen.
The stirrer according to the invention is spherical. In the context of the invention, this is understood to mean the following:
  • The agitator has an outer surface that is basically (predominantly) curved. The outer surface is preferably arched overall, that is to say has no edges and no points. The agitator is basically a round body.
  • The outer surface is closed (i.e. has no openings) so that the agitator element only comes into contact with the material to be mixed on the outside (with its outer surface). This does not rule out that if the stirrer element is not strictly spherical, bulges or the like are provided on the outer surface.
  • The agitator can, but does not have to, be symmetrically shaped. The agitator element is preferably spherical in the geometric sense, but it can also be an ellipsoid or a non-symmetrically shaped, similar round body.
  • If the impeller is not strictly spherical, it has a maximum and a minimum radius, the maximum radius being greater than the minimum radius. The difference in size between these radii is preferably no greater than 5, and particularly preferably the maximum radius is less than twice as large as the minimum radius.
  • The stirrer can be a hollow body or consist of solid material.

Die Erfindung löst sich damit grundsätzlich vom Konzept durchströmter Rührorgane. Bei den im Stand der Technik bekannten Lösungen mit Rohrkörper-Rührorganen wird das Mischgut mittels einer Beschleunigung und Umleiten der erzeugten Strömung an der Behälterwand zum Vermischen angeregt. Dabei wird grundsätzlich mit Überdruck, also mit Druckkräften gearbeitet.The invention thus fundamentally breaks away from the concept of agitating elements with a flow. In the case of the solutions with tubular body stirring elements known in the prior art, the material to be mixed is stimulated to mix by means of an acceleration and redirection of the flow generated on the container wall. In principle, overpressure, i.e. pressure forces, is used.

Bei einem kugelähnlich als Rundkörper ausgebildeten Rührorgan bewirkt dessen Form einen Uberdruck in Bewegungsrichtung vor dem Rührorgan, eine Beschleunigung des Mischgutes aussenseitig um das Rührorgan herum, und einen Unterdruck im Mischgut in Bewegungsrichtung hinter dem Rührorgan. Da das Mischgut praktisch nicht kompressibel ist, und sehr schnell aus dem Überdruckbereich vor dem Rührorgan in den Unterdruckbereich hinter dem Rührorgan geführt wird, entsteht ein Sog bzw. eine Expansionswirkung auf das Mischgut, was zur Aufbrechung der Struktur des Mischgutes beiträgt und die Durchmischung befördert.In the case of a spherical agitator designed as a round body, its shape causes an overpressure in the direction of movement in front of the agitator, an acceleration of the material to be mixed on the outside around the agitator, and a vacuum in the material to be mixed in the direction of movement behind the agitator. Since the mix is practically incompressible and is quickly moved from the overpressure area in front of the agitator to the negative pressure area behind the agitator, there is suction or an expansion effect on the mix, which contributes to the breakdown of the structure of the mix and promotes mixing.

Durch die Form des Rührorgans ist die Durchmischung des Mischgutes dabei sehr schonend. Scherbeanspruchungen werden weitgehend vermieden. Besonders durch den Unterdruckbereich hinter dem Rührorgan werden Absetzungen im Behälter sehr effektiv, aber schonend abgelöst und aufgerührt, ohne wesentliche Scherkräfte einzusetzen.Due to the shape of the agitator, the mixing of the mix is very gentle. Shear stresses are largely avoided. Particularly due to the negative pressure area behind the agitator, deposits in the container are removed and stirred up very effectively, but gently, without using significant shear forces.

Die Bauweise des erfindungsgemäßen Rührwerks ermöglicht sehr wandnahes Arbeiten ohne Gefahr von Beschädigungen der Behälterwand. Zudem ist das erfindungsgemäße Rührwerk leicht zu reinigen, zumal sich in den geschlossenen Rührorganen kein Mischgut festsetzen kann.The construction of the agitator according to the invention enables work very close to the wall without the risk of damaging the container wall. In addition, the agitator according to the invention is easy to clean, especially since no material to be mixed can get stuck in the closed agitator elements.

Das erfindungsgemäße Rührwerk ermöglicht ein verbessertes Begasen des Produktes, weil sich wegen der im wesentlichen ungerichteten Strömung im Produkt kaum größere Gasblasen bilden.The agitator according to the invention enables improved gassing of the product because, because of the essentially undirected flow, hardly any larger gas bubbles form in the product.

Mehrere Rührorgane sind vorzugsweise gleich geformt und gleich groß.Several agitators are preferably shaped identically and of the same size.

Alle Rührorgane sind mittels Tragarmen an der Drehwelle des Rührwerks beabstandet befestigt. Bevorzugt wird eine Anordnung aller Rührorgane im gleichen Abstand zur Drehwelle und im gleichen Abstand voneinander, also im Sinne einer symmetrischen "sternförmigen" Anordnung um die Drehwelle.All agitator elements are attached to the rotating shaft of the agitator by means of support arms. An arrangement of all stirring elements at the same distance from the rotary shaft and at the same distance from one another, that is to say in the sense of a symmetrical "star-shaped" arrangement around the rotary shaft, is preferred.

Es wird ein Rührwerk zum Mischen und / oder Homogenisieren bzw. Suspendieren strömungsfähiger Medien mit wenigstens zwei Rührorganen vorgeschlagen, wobei jedes Rührorgan über einen Tragarm mit einer Nabe zur Verbindung mit einer antreibbaren Drehwelle verbunden ist.An agitator for mixing and / or homogenizing or suspending flowable media with at least two agitating elements is proposed, each agitating element being connected via a support arm with a hub for connection to a drivable rotary shaft.

Bevorzugt ist eine zur Rotationsachse des Rührwerks symmetrische Anordnung der Rührorgane. Bevorzugt ist es weiterhin, dass alle Rührorgane im gleichen Abstand zur Rotationsachse des Rührwerks angeordnet sind.An arrangement of the agitator elements symmetrical to the axis of rotation of the agitator is preferred. It is further preferred that all agitator elements are arranged at the same distance from the axis of rotation of the agitator.

Die zur Verbindung der Rührorgane mit der antreibbaren Drehwelle vorgesehenen Tragarme sind vorzugsweise im gleichen Winkelabstand zueinander und in einer gemeinsamen Radialebene angeordnet. D.h., dass die Tragarme radial verlaufen.The support arms provided for connecting the agitator elements to the drivable rotary shaft are preferably arranged at the same angular distance from one another and in a common radial plane. This means that the support arms run radially.

Eine bevorzugte Ausführungsform der Erfindung wird nachfolgend anhand der Zeichnung näher erläutert. Diese zeigt:
Fig. 1 eine perspektivische dreidimensionale Ansicht eines erfindungsgemäßen Rührwerks.A preferred embodiment of the invention is explained in more detail below with reference to the drawing. This shows:
Fig. 1 a perspective three-dimensional view of an agitator according to the invention.

Das Rührwerk der Fig. 1 weist drei Rührorgane 1 auf, von denen jedes über einen Tragarm 3 mit einer Nabe 2 verbunden ist.The agitator of the Fig. 1 has three stirring elements 1, each of which is connected to a hub 2 via a support arm 3.

Im Ausführungsbeispiel sind die Rührorgane 1 kugelförmig. Sie werden durch kugelförmige Hohlkörper aus Metall oder Kunststoff gebildet, die jeweils an einem radial auswärtigen Ende eines Tragarms 3 angebracht sind.In the exemplary embodiment, the stirring elements 1 are spherical. They are formed by spherical hollow bodies made of metal or plastic, each of which is attached to a radially outward end of a support arm 3.

Im Betrieb ist die Nabe 2 mit der nicht gezeigten Drehwelle des Rührwerks zur gemeinsamen Drehung um die Rotationsachse des Rührwerks koaxial verbunden. Die Rührgane bewegen sich daher im Betrieb auf einer gemeinsamen Umlaufbahn um die Drehwelle.In operation, the hub 2 is connected coaxially to the rotary shaft, not shown, of the agitator for common rotation about the axis of rotation of the agitator. The agitators therefore move on a common orbit around the rotating shaft during operation.

Die Erfindung ist nicht auf die in den Fig. 1 dargestellte Ausführungsform beschränkt. Insbesondere kann die Anzahl der Rührorgane 1 sowie deren Querschnittsform und deren Anordnung zueinander variieren. Ferner ist die Erfindung nicht auf die in der Zeichnung gewählten Abmessungen beschränkt. Die konkreten Abmessungen ergeben sich jeweils in Abhängigkeit vom vorgesehenen Anwendungsbereich und sind insbesondere auf die Größe eines das Rührgut aufnehmenden Behälters abgestimmt.The invention is not limited to those in the Fig. 1 illustrated embodiment limited. In particular, the number of stirring elements 1 and their cross-sectional shape and their arrangement with respect to one another can vary. Furthermore, the invention is not limited to the dimensions selected in the drawing. The specific dimensions result in each case as a function of the intended area of application and are in particular matched to the size of a container holding the material to be stirred.

Claims (6)

  1. Agitator for the mixing and/or homogenisation of fluid media, comprising a container and a rotary shaft, which can be driven by an electric motor, and by means of which at least two agitating elements, connected to the rotary shaft such that they cannot rotate relative to the latter, are moved on a circular path, wherein
    the agitating elements, inserted in the vessel in a fluid medium, are flowed around by the medium by virtue of their movement, wherein
    each agitating element (1) is designed as a round body similar to a sphere, and has a closed outer surface,
    characterised in that, each agitating element (1) is connected via a radially extending support arm (3) to a hub (2) for connection to the drivable rotary shaft, wherein
    the radially extending support arms (3) are arranged in a common radial plane.
  2. Agitator according to Claim 1,
    characterised in that, the agitating elements (1) are symmetrically arranged at the same distance from the rotary shaft.
  3. Agitator according to Claim 1 or 2,
    characterised in that, the agitating elements (1) are of the same size and shape.
  4. Agitator according to one of the Claims 1 to 3,
    characterised in that, the outer surface of each agitating element (1) has no edges or points.
  5. Agitator according to Claim 4,
    characterised in that, each agitating element (1) has a maximum radius and a minimum radius, the ratio of which is preferably less than 5, particularly preferably less than 2, or the agitating element (1) is spherical in shape.
  6. Agitator according to one of the Claims 4 or 5,
    characterised in that, each agitating element (1) is a hollow body, preferably made of metal or plastic.
EP17200831.0A 2017-11-09 2017-11-09 Stirrer Active EP3482821B1 (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
HUE17200831A HUE054132T2 (en) 2017-11-09 2017-11-09 Stirrer
ES17200831T ES2874181T3 (en) 2017-11-09 2017-11-09 Agitator
EP17200831.0A EP3482821B1 (en) 2017-11-09 2017-11-09 Stirrer
DK17200831.0T DK3482821T3 (en) 2017-11-09 2017-11-09 STIRS
PL17200831T PL3482821T3 (en) 2017-11-09 2017-11-09 Stirrer
US16/184,600 US11110410B2 (en) 2017-11-09 2018-11-08 Stirring element and agitator
RU2018139282A RU2716679C1 (en) 2017-11-09 2018-11-08 Kneading tool and mixer
CN201811330110.9A CN109758942B (en) 2017-11-09 2018-11-09 Stirrer

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17200831.0A EP3482821B1 (en) 2017-11-09 2017-11-09 Stirrer

Publications (2)

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EP3482821A1 EP3482821A1 (en) 2019-05-15
EP3482821B1 true EP3482821B1 (en) 2021-02-17

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CN (1) CN109758942B (en)
DK (1) DK3482821T3 (en)
ES (1) ES2874181T3 (en)
HU (1) HUE054132T2 (en)
PL (1) PL3482821T3 (en)
RU (1) RU2716679C1 (en)

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CN111760750A (en) * 2020-07-09 2020-10-13 深圳妙格投资控股集团有限公司 LED fluorescent powder spraying device
CN115119572B (en) * 2022-08-17 2023-10-27 湖南三耳重工科技发展有限公司 Energy-saving hydraulic soil-alien spraying and seeding machine

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Also Published As

Publication number Publication date
US11110410B2 (en) 2021-09-07
HUE054132T2 (en) 2021-08-30
DK3482821T3 (en) 2021-05-03
ES2874181T3 (en) 2021-11-04
RU2716679C1 (en) 2020-03-13
PL3482821T3 (en) 2021-07-19
CN109758942A (en) 2019-05-17
CN109758942B (en) 2022-05-31
US20190134579A1 (en) 2019-05-09
EP3482821A1 (en) 2019-05-15

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