EP3498365A1 - Stirrer device - Google Patents

Abstract

The invention is based on an agitator device (10), in particular a non-agitated stirring device (10), in particular for mixing low-viscosity to medium-viscosity media, with at least one agitator shaft (12) and with at least one outer agitator blade (12) held on the agitator shaft (12). 14), which is arm-shaped in at least one section (18). It is proposed that the stirring device (10) comprises an internal stirring blade (16) which together with the external stirring blade (14) forms at least one blade-like conveying unit (20) at least for a promotion of a medium in at least one direction parallel to the stirring shaft (12) and in particular in at least one further direction perpendicular to the stirring shaft (12) is provided.

Description

State of the art

The invention relates to an agitator device, in particular a non-agile stirring device, according to the preamble of claim 1.

There are already known Wandührige stirrer devices with lattice and / or blade-shaped stirring blades, which generate at least locally a radial flow. An open geometry in an upper area additionally causes an axial flow, which results from a backflow of a medium in the direction of a Rührorganmitte. In addition, a large number of predominantly wall-mounted helical and armature-like stirring elements are known, which are particularly suitable for highly viscous media.

Furthermore, from the document JP 5736127 B2 a Wandgehäusigem stirrer known, which comprises stirring blades with a helical geometry and blades near the ground.

The object of the invention is in particular to provide a generic device with improved stirring properties. The object is achieved by the features of claim 1 and claim 2, while advantageous embodiments and modifications of the invention can be taken from the dependent claims.

Advantages of the invention

The invention is based on an agitator device, in particular a non-agitated stirring device, in particular for mixing low-viscosity to medium-viscosity media, preferably for polymerization processes, with at least one stirring shaft and with at least one, held on the stirring shaft outer stirring blade, which is formed arm-shaped in at least one section.

In one aspect of the invention, it is proposed that the stirring-device device has at least one inner-stirring blade which together with the outer-stirring blade forms at least one blade-like conveying unit which is at least parallel to the stirring shaft and at least one further direction perpendicular to the stirring shaft Stirring shaft is provided.

In a further aspect of the invention, which in particular can be considered alone or in combination with further aspects of the invention, it is proposed that the outer stirring blade has at least one further section adjoining the section, in which the outer stirring blade is at least substantially wider than is formed in the section.

As a result, advantageously improved stirring properties can be achieved. Particularly advantageously, improved mixing of a medium in at least one operating state of the stirring device can be achieved. Advantageously, a shortened mixing time can be achieved. In addition, a dependence of the mixing time of a viscosity can be advantageously reduced. In particular, an advantageous suspension in particular of solid fractions of the medium and / or in particular an improved emulsion and / or dispersion of the medium can be made possible. In particular, properties of the suspension, the emulsion and / or the dispersion can be manipulated in a targeted manner. Particularly advantageously, at least one flow of the medium in a direction parallel to and perpendicular to the stirring shaft can be achieved. In particular, a portion of the flow in a vertical direction can be favorably influenced. In particular, a flexible stirrer device can be provided which can be operated as an axial and / or radial stirrer device. moreover Advantageously, an improved heat exchange between the medium and heating and / or cooling elements can be achieved.

An "agitator device" is to be understood as meaning, in particular, a constituent, in particular a functional and / or functional component, of a stirring element, for example a mixer and / or a stirring system, in particular for low-viscosity to medium-viscosity media. In particular, the stirring device may comprise the entire mixer. Advantageously, the agitator device is designed as a component of a stirring element or as a stirring element. Particularly advantageously, the stirring device is provided to be rotated about a rotation axis, in particular in a stirring and / or mixing. In a view along a stirrer shaft of the stirrer device, the stirrer device is preferably point-symmetrical, in particular with respect to a longitudinal extent of the stirrer shaft. Advantageously, in an assembled state, the stirring shaft runs parallel to a vertical direction, preferably in the direction of an acting gravity, in particular in a normal operating state of the stirring device, wherein the vertical direction is preferably perpendicular to a substrate.

The term "arm-shaped" is intended to mean, in particular, that the component is of elongated design, the component having a longitudinal extension, in particular bent and / or angled, which is in particular at least a factor of 2 larger than a longitudinal extent Longitudinal extent is at least substantially perpendicular lying transverse extent.

A "non-agitated stirrer device" is to be understood here in particular as an agitator device in which a ratio between a largest diameter of the stirrer device and an inner diameter of a container which is intended for use with the stirrer device is greater than 1.05.

A "low-viscosity to medium-viscosity medium" is to be understood here in particular as a medium whose dynamic viscosity is below a reference value of 50 Pa s at a reference temperature of 20 ° C.

A "delivery unit" is to be understood in particular as meaning a particular mechanical unit which, in at least one operating state, conveys, shifts and / or mixes a medium, in particular a fluid and / or a solid, in at least one direction. In particular, the delivery unit can generate a flow, in particular within a container, in at least one operating state. A "scoop-like conveying unit" is to be understood here in particular as a conveying unit which has a surface which consists of a plurality of mutually angled, in particular separate, closed subregions which partially define a volume. The surface may in particular have at least one opening and / or a gap.

The term "at least a large part" should be understood to mean in particular at least 55%, advantageously at least 65%, preferably at least 75%, particularly preferably at least 85% and particularly advantageously at least 95%. In particular, the outer stirring blade has an average width, which is preferably greater than 25%, particularly preferably greater than 40% and less than 50% of a largest diameter of the stirring device at least one observation along the agitator shaft, wherein below the average width in particular a maximum average extent of Outer blade to be understood perpendicular to the stirring axis in at least one operating position in which the Rührorganvorrichtung can perform at least one function in an operational and assembled state. In particular, the further section is arranged with respect to at least one operating position in a lower region of the stirring device. Preferably, the further section has an average width which exceeds an average width of the section by at least a factor of 2.

It is further proposed that the inner stirring blade forms a blade-like conveying unit together with the further section of the outer stirring blade. The inner stirring blade and the further section are arranged in particular at an angle to one another and together form an engagement surface of the conveying unit for an energy input into the medium. This allows an optimized energy input and an advantageous mixing of the medium take place. In addition, this allows a structurally simple design of the blade-like conveyor unit can be achieved.

In addition, it is proposed that the inner stirring blade lies, at least for the most part, in particular completely, in an inner stirring blade plane and in particular is plate-like. The Innenrührblattebene can be aligned in particular at least substantially parallel to a rotation axis of the agitator shaft. Advantageously, the axis of rotation lies in the inner paddle plane. By "at least substantially" is to be understood in this context in particular that a deviation from a predetermined value, in particular less than 25%, preferably less than 10% and more preferably less than 5% of the predetermined value deviates. Preferably, a percentage difference between an average width of the inner stirring blade and an average height of the inner stirring blade is less than 50%. Preferably, the inner stirring blade is formed separately from the outer stirring blade. In particular, the inner stirring blade and / or the outer stirring blade is cut or punched out of the plate-like workpiece and, in particular, subsequently machined, for example, by grinding it and its edges being rounded. As a result, a cost reduction and / or a time reduction can be achieved in a manufacturing process. Preferably, the Rührorganvorrichtung has a Innenrührblattnabe, which is preferably integrally connected to the Innenrührblatt. By "one piece" should be understood in particular at least materially connected connected, for example, by a welding process, a gluing process, a Anspritzprozess and / or another, the skilled person appear useful process, and / or advantageously formed in one piece, such as by a Production from a single mold and / or by a production in a one- or multi-component injection molding process and advantageously from a single blank. The Außenrührblattnabe can be fastened in particular by means of a cohesive, preferably by means of a positive and / or non-positive connection to the agitator shaft. In particular, the Außenrührblattnabe and / or the Innenrührblattnabe at least to a large extent and in particular completely made of a metal, for example made of steel and / or stainless steel and / or any other metal such as aluminum and / or titanium and / or an alloy. But it is also conceivable that the Außenrührblattnabe and / or the Innenrührblattnabe are at least partially made of a plastic. As a result, a secure and / or, in particular, a robust construction can advantageously be achieved.

In particular, a normal of the Innenrührblattebene is aligned in the assembled state perpendicular to the axis of rotation of the Rührorganvorrichtung, so that the Innenrührblatt preferably causes a radial flow component. Preferably, the inner stirrer blade has a trapezoidal Innenrührblattaußenkontur, wherein a bottom of the Innenrührblatts is wider than an upper side in at least one observation perpendicular to the stirrer shaft. Preferably, the underside and the top are parallel to each other and aligned perpendicular to the agitator shaft. The inner stirrer blade outer contour has in particular at least one right and at least one pointed inner stirrer blade angle. Preferably, the inner stirring blade is formed in one piece. By "one-piece" should be understood in particular formed in one piece. Preferably, this is a piece of a single blank, a mass and / or a casting, more preferably in an injection molding process, in particular a one- and / or multi-component injection molding process prepared. Advantageously should be understood in one piece and one piece. It is also conceivable for the inner stirring blade to have a split design, wherein the inner stirring blade is divided into a plurality of segments, which can each be fastened to the stirring shaft by means of a segment hub, so that the segments are assembled in at least one mounted state form the inner stirring blade. As a result, in particular a cost-effective production and / or easy maintenance can be made possible. Furthermore, a simple and flexible assembly can be realized thereby. In addition, in particular, an advantageous radial flow component can be generated.

In an advantageous embodiment of the invention, it is proposed that the outer stirring blade lie at least to a large extent, in particular completely, in an outer stirring blade plane. Preferably, the outer stirring blade has a one-piece design. In particular, the outer stirring blade may also have a split design, whereby a low-cost assembly can be achieved. In particular, the outer paddle plane is aligned at an angle to the agitator shaft, whereby a minimum angle of attack between the outer paddle plane and a straight line originating from the agitator shaft preferably arises, wherein the pitch angle is particularly preferably at least substantially equal to at least one pointed paddle pitch. In particular, the angle of attack is more than 0 ° and less than 90 °. The angle of attack is preferably 50 ° and 70 °. Particularly preferably, the angle of attack is 60 °. In particular, the outer paddle plane and the inner paddle plane are at right angles. In particular, the outer stirring blade and the inner stirring blade each describe a largest circle in a full rotation about the stirring axis in at least one operating state when viewed along the agitator shaft, wherein the circles are concentric and in particular have different radii. Preferably, the Rührorganvorrichtung has at least one Außenrührblattnabe, wherein the Außenrührblattnabe by means of a cohesive, preferably by means of a positive and / or non-positive connection, is attachable to the agitator shaft. This allows a cost-effective and procedurally flexible production and / or easy maintenance of the outer stirring blade are made possible.

The stirrer device, in particular the inner stirrer blade and / or the outer stirrer blade, is preferably formed at least to a large extent and in particular completely from a metal, for example from steel and / or stainless steel and / or any other metal such as aluminum and / or titanium and / or an alloy. But it is also conceivable that the Rührorganvorrichtung is at least partially made of a plastic. Furthermore, it is conceivable that individual components of the stirrer device consist of different materials.

Furthermore, it is proposed that the blade-like conveying unit has at least one passage gap. In particular, the passage gap is arranged between the outer stirring blade and the inner stirring blade and is at least partially delimited thereby, so that the passage gap preferably has two mutually parallel, parallel boundaries. The passage gap is in particular provided to exclude a portion of a medium to be mixed from a delivery in a radial direction and in particular to produce a turbulent flow component. As a result, advantageous mixing properties can be achieved. In addition, a starting torque of the stirring device can thereby be reduced.

In addition, it is proposed that at least one extension of the passage gap is adjustable, wherein in particular "extension" is to be understood as a smallest distance between the outer stirring blade and the inner stirring blade along the passage gap. The positioning of the inner stirring blade on the stirring shaft and the outer stirring blade is in particular variably adjustable relative to each other, whereby the extent of the passage gap is variable. The extension of the passage gap is adjustable in particular by a displacement of the inner stirring blade relative to the outer stirring blade along the stirring shaft and / or a rotation of the inner stirring blade relative to the outer stirring blade about the stirring axis. A minimum, in particular a negligibly small, extent of the passage gap can be realized at a position of the outer stirring blade and the inner stirring blade in which the outer stirring blade plane and the inner stirring blade plane intersect at a right angle, by a displacement of the inner stirring blade relative to the outer stirring blade along the agitating shaft. By a shift of the inner stirring blade relative to the outer stirring blade along the agitating shaft, in particular, a minimum extension of the passage gap between a minimum, in particular a vanishingly small extension and a maximum extent, which is caused by a respective construction of the outer stirring blade and the inner stirring blade, adaptable. Thus, in particular, a geometry of the blade-like delivery unit can be changed and adapted to different properties and properties of the medium, for example a density, a toughness, an aggregate state of a disperse phase and / or a dispersion medium. As a result, advantageous mixing, mixing and / or dispersing properties can be achieved. This advantageously makes it possible to achieve adjustability of a ratio of a flow parallel to the agitator shaft to a flow that is perpendicular to the agitator shaft.

It is also proposed that the inner paddle blade has at least one inner paddle normal and the outer paddle blade has at least one outer paddle normal, wherein the paddle normal and outer pad normal include a minimum normal angle greater than 0 ° and at most 90 °. In particular, the Innenrührblattnormale corresponds to at least a normal vector of Innenrührblattebene and the Außenrührblattnormale at least one other normal vector of the outer paddle plane. In particular, the angle of attack included by the outer paddle plane with the straight line extending from the beater axis is linked to the normal angle by a relationship: normal angle = (90 ° angle of incidence). In this way, in particular, a fluidically advantageous shape design of the delivery unit can be realized.

In order to be able to realize a high variability in an adaptation of a shape of the delivery unit, it is proposed that the minimum normal angle is adjustable. Adjustment of the normal angle may be achieved by rotation of the inner stirring blade and / or the outer stirring blade about the stirring shaft in which the inner stirring blade and the outer stirring blade are arranged by means of the inner mixing blade hub and / or the outer stirring blade hub, can be carried out.

In addition, it is proposed that the inner stirring blade can be fastened in different angular positions relative to the outer stirring blade on the stirring shaft. In particular, the Innenrührblattnabe by the Innenrührblattnabe by means of a nondestructive releasable connection, for example by means of a screw, pin, bolt and / or by means of a shaft-hub connection or other, known in the art form and / or non-positive connection to attached to the stirrer shaft. As a result, the normal angle can advantageously be adapted flexibly.

Furthermore, it is proposed that the stirring device comprises at least one spar, via which the outer stirring blade is connected to the stirring shaft. Preferably, the spar connects the outer stirring blade with the outer stirring blade hub, wherein the outer stirring blade hub and thus the outer stirring blade can be fastened to the stirring shaft. Advantageously, the main extension direction of the spar runs along a straight line perpendicular to the agitator shaft. However, it is also an angular course of the main extension direction of the spar conceivable. A "main extension direction" of an object should be understood to mean, in particular, a direction which runs parallel to a longest edge of a smallest geometric cuboid which just completely encloses the object. Preferably, the spar has a circular cross-section, wherein other cross-sectional shapes are conceivable. Preferably, the Rührorganvorrichtung two spars, which connect the Außenrührblatt at different locations, in particular via the Außenrührblattnabe preferably at an upper, the agitator shaft facing Außenrührblattseite and at a lower, the agitator shaft facing Außenrührblattseite on the stirrer shaft. In particular, the Außenrührblattnabe with the spar and the outer stirring blade with the spar are integrally connected. It is also conceivable that one of two different number of spars connecting the outer blade with the agitator shaft. In particular, the Holm at least for the most part and in particular completely formed of a metal, for example made of steel and / or stainless steel and / or any other metal such as aluminum and / or titanium and / or an alloy. But it is also conceivable that the spar is at least partially made of a plastic. As a result, a stable connection of the outer stirring blade to the stirring shaft can advantageously be effected.

A particular complete and effective mixing can be achieved if the stirring device comprises at least one bottom stirring blade, which is arranged below the outer stirring blade and / or the inner stirring blade viewed along the stirring shaft. In particular, the stirring device comprises a Bodenrührblattnabe, which is connected to the Bodenrührblatt preferably by means of a material connection, preferably by means of a weld. In particular, the Bodenrührblatt is plate-like and lies at least a large part within a Bodenrührblattebene. Preferably, the stirring axis is within the Bodenrührblattebene. In particular, a bottom blade normal which is parallel to a normal vector of the bottom blade and the inside blade normal are in two parallel planes. In particular, when viewed perpendicularly to the stirring axis, the bottom stirring blade has a convex contour at least in sections. Preferably, the Bodenrührblatt and / or Bodenrührblattnabe at least to a large extent and in particular completely made of a metal, for example made of steel and / or stainless steel and / or any other metal such as aluminum and / or titanium and / or an alloy. Preferably, the outer stirring blade, the inner stirring blade and the bottom stirring blade are formed separately from each other. However, it is also conceivable that the outer stirring blade, the inner stirring blade and / or the Bodenrührblatt are integrally formed.

In an advantageous embodiment of the invention it is proposed that the Bodenrührblatt can be fastened in different angular positions relative to the outer stirring blade and in particular with respect to the Innenrührblatt on the stirring shaft. In particular, the bottom blade pitch normal and the outside blade pitch normal have a first minimum angular position which is more than 0 ° and at most 90 °. In particular, the angle of attack is linked to the first angular position by a relationship: first angular position = (90 ° angle of attack). In particular, the bottom stirring blade has a second minimum angular position, which includes the bottom blade pitch normal and the inside blade pitch normal, the second minimum angular position being between 0 ° and 180 °. As a result, in particular a fluidically particularly advantageous mixing of the medium can be realized.

In a preferred embodiment of the invention, it is proposed that the stirring element device has at least one further outer stirring blade, which is designed analogously to the outer stirring blade. Preferably, the Rührorganvorrichtung two outer stirring blades, which are opposite to the stirring shaft mirror symmetry and are connected by means of a respective spar with the Außenrührblattnabe. In particular, each point of the one outer stirring blade in each stirring plane, which is perpendicular to the stirring axis, can be superimposed by a rotation through 180 ° about the stirring axis with a corresponding point of the further outer stirring blade. In particular, when N is a number of the outer stirring blades, an angular distance of each outer stirring blades to each other in each stirring plane is 360 ° / N. The agitator device preferably has at least one further inner stirring blade and / or a further soil stirring blade. Preferably, the Rührorganvorrichtung each two Innenrührblätter, which are connected to the Innenrührblattnabe in particular by means of a material connection, and two Bodenrührblätter, which are connected to the Bodenrührblattnabe by means of a material connection on. In particular, the number of the outer stirring blades, the inner stirring blades and / or the Bodenrührblätter vary and each amount to more than 2 pieces. As a result, an efficient and needs-oriented design of the stirring device can be achieved.

In addition, it is proposed that the outer stirring blade and the further outer stirring blade form at least one viewing perpendicular to the stirring shaft, in particular along a direction parallel to the spar, together a closed curved outer contour, in particular an ellipse. In particular, when viewed, the outer stirring blade and the further outer stirring blade overlap at least partially in a lower and in an upper region of the outer contour, in which a connection takes place between the respective spar and the respective outer stirring blade. Preferably, the outer contour is mirror-symmetrical with respect to the stirring shaft. It is conceivable that the outer contour has a deviating from the ellipse, in particular not closed, geometric shape. As a result, advantageous flow-related stirring properties can be achieved.

It is also proposed that the outer stirring blade and the further outer stirring blade together form an ellipse with a non-elliptical recess in at least one observation perpendicular to the stirring shaft. Preferably, the recess at least partially has an elliptical inner contour, which is delimited by the arm-shaped sections of the outer stirring blade and of the further outer stirring blade. In particular, a lower region of the area enclosed by the outer contour, in particular approximately one third, is closed. As a result, in particular optimized mixing properties can be achieved.

Furthermore, an agitation system with at least one stirring device is proposed. In particular, the agitator device has a diameter of at least 0.2 meters, preferably of at least 0.5 meters, more preferably of at least 1 meter.

Furthermore, a stirring system with at least one container and with at least one stirring element arranged in the container is proposed. In particular the stirring system for industrial applications, in particular for polymerization, preferably in a polymerization reactor provided. In particular, the container has a volume of at least 10 liters, preferably of at least 100 liters, more preferably of at least 500 liters.

The agitator device according to the invention should not be limited to the application and embodiment described above. In particular, the stirrer device according to the invention may have a number deviating from a number of individual elements, components and units specified herein for fulfilling a mode of operation described herein.

drawings

Further advantages emerge from the following description of the drawing. In the drawings, an embodiment of the invention is shown. The drawings, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into meaningful further combinations.

Fig. 1

einen Teil eines Rührorgans mit einer Rührorganvorrichtung in einer perspektivischen Seitenansicht,

Fig. 2

jeweils mittels Holmen der Rührorganvorrichtung mit Außenrührblattnaben der Rührorganvorrichtung verbundene Außenrührblatt der Rührorganvorrichtung und ein weiteres Außenrührblatt der Rührorganvorrichtung in einer perspektivischen Seitenansicht,

Fig. 3

das Außenrührblatt und das weitere Außenrührblatt in einer Seitenansicht quer zu einer Holm-Nabe-Verbindung der Rührorganvorrichtung,

Fig. 4

das Außenrührblatt und das weitere Außenrührblatt in einer Seitenansicht entlang der Holm-Nabe Verbindung,

Fig. 5

ein Innenrührblatt der Rührorganvorrichtung und ein weiteres Innenrührblatt der Rührorganvorrichtung an einer Innenrührblattnabe der Rührorganvorrichtung, befestigt in einer perspektivischen Seitenansicht,

Fig. 6

ein Bodenrührblatt der Rührorganvorrichtung und ein weiteres Bodenrührblatt der Rührorganvorrichtung an einer Bodenrührblattnabe der Rührorganvorrichtung, befestigt in einer perspektivischen Seitenansicht und

Fig. 7

ein Rührsystem mit dem in einem Behälter angeordneten Rührorgan.

Show it:

Fig. 1

a part of a stirring element with a stirring device in a perspective side view,

Fig. 2

outer stirring blade of the agitator device connected to each of the stirrer device by means of straddling the stirrer device with outer stirrer blade hubs, and another outer stirrer blade of the stirrer device in a perspective side view,

Fig. 3

the outer stirring blade and the further outer stirring blade in a side view transversely to a spar-hub connection of the stirring device,

Fig. 4

the outer stirring blade and the further outer stirring blade in a side view along the spar hub connection,

Fig. 5

an inner stirring blade of the stirring device and a further inner stirring blade of the stirring device on a Innenrührblattnabe the Rührorganvorrichtung attached in a perspective side view,

Fig. 6

a Bodenrührblatt the Rührorganvorrichtung and another Bodenrührblatt the Rührorganvorrichtung to a Bodenrührblattnabe the Rührorganvorrichtung attached in a perspective side view and

Fig. 7

a stirring system with the agitator arranged in a container.

Description of the embodiment

In the embodiment described below, various structural units and / or components are present multiple times. Analogously configured components and / or structural units, which are provided with the same reference numerals in the drawings, are described only once for the sake of simplicity in the following description of the drawings.

Fig. 1 shows a part of a stirrer 46 with at least one Rührorganvorrichtung 10 in a perspective side view. The agitator device 10 is designed as a non-agile agitator device 10. The stirring device 10 is particularly intended for mixing low-viscosity to medium-viscosity media. The stirring device 10 has a stirring shaft 12. The stirring shaft 12 rotates in at least one operating state about a stirring axis 60 of the stirring device 10. The stirring shaft 12 transmits a torque and displaces elements arranged on the stirring shaft 12 in a rotational movement. On the stirring shaft 12, an outer stirring blade 14 and another outer stirring blade 40 of the stirring device 10 are arranged. The further outer stirring blade 40 is designed analogously to the outer stirring blade 14.

On the stirring shaft 12, an inner stirring blade 16 and another inner stirring blade 48 of the stirring device 10 are arranged. The additional inner stirring blade 48 is designed analogously to the inner stirring blade 16.

On the stirring shaft 12, a Bodenrührblatt 38 and another Bodenrührblatt 50 of the Rührorganvorrichtung are arranged. The further Bodenrührblatt 50 is formed analogous to the Bodenrührblatt 38.

In the following, the outer stirring blade 14, the inner stirring blade 16 and the bottom stirring blade 38 are described in each case, the description in each case also being valid for the further outer stirring blade 40, the further inner stirring blade 48 and the further base stirring blade 50.

The outer stirring blade 14 has an arm-shaped section 18. The outer stirring blade 14 has a further section 22. The further section 22 adjoins the section 18. The outer stirring blade 14 is wider in the further section 22 than in the section 18.

The agitator device 10 has a first outer blade hub 56. The agitator device 10 has a further Außenrührblattnabe 58. The agitator device 10 has a first spar 52. The agitator device 10 has a second spar 54. The outer stirring blade 14 is connected to the first outer stirring blade hub 56 in the section 18 by means of the first spar 52 of the stirring device 10 ( Fig. 2 ). The outer stirring blade 14 is connected by means of the second stile 54 in the further section 22 with the further Außenrührblattnabe 58. The first outer blade hub 56 and the further outer blade hub 58 are secured to the agitator shaft 12 by a threaded connection, respectively. Other connections of the first outer blade hub 56 and the second outer blade hub 58, for example a clamping connection, are also conceivable. The first spar 52 and the second spar 54, when viewed along the agitator shaft 12, point in opposite directions from the agitator shaft 12 so that the first spar 52 and the second spar 54 enclose an angle of 180 °. The first spar 52 and the second spar 54 are each aligned perpendicular to the stirrer shaft 12.

The agitator device 10 has an outer paddle plane 26. The outer stirring blade 14 lies completely in the outer stirring blade plane 26 (FIG. Fig. 2 ). The arm-shaped section 18 has a constant, lying in the Außenrührblattebene 26, the smallest section thickness 104. The section thickness 104 is preferably between 5% of a diameter 102 of the Rührorganvorrichtung 10 and less than 50% of the diameter 102 particularly preferably 15% of the diameter 102. When viewed perpendicular to the stirring shaft 12 and to a main extension direction of the spar 52 form the outer stirring blade 14 and the further outer stirring blade 40 has an X-shaped contour. A "main direction of extension" of an object should in particular be understood to mean a direction which runs parallel to a longest edge of a smallest geometric cuboid which just completely encloses the object. The inner stirring blade 16 has at least one internal mixing blade normal 32 (FIG. Fig. 1 ). The outer stirring blade 14 has at least one outer stirring blade normal 34. The inner paddle normal 32 and the outer paddle normal 34 include a minimum normal angle 36 of 90 °. The normal angle 36 may be greater than 0 ° and not more than 90 °.

The normal angle 36 is adjustable. An adaptation of the normal angle 36 can be effected for example by means of a rotation of the inner stirring blade 16 about the stirring axis 60. The normal angle 36 depends on an inclination of the outer stirring blade 14 with respect to a plane perpendicular to the stirring axis 60.

The outer stirring blade 14 has an outer stirring blade length 108 (FIG. Fig. 3 ). The outer stirring blade 14 has an angle of incidence 62 with respect to a plane oriented perpendicular to the stirring shaft 12. The angle of attack 62 is preferably 60 °. The normal angle 36 can be determined from the relationship normal angle 36 = (90 ° - angle of attack 62). Stirring device 10 has a diameter 102 ( Fig. 3 ). The diameter 102 is at the angle of attack 62 linked by a relationship cos (angle of attack 62) = diameter 102 / outer blade length 108.

FIG. 5 shows the internal stirring blade 16. The stirring device 10 has a Innenrührblattebene 24. The inner stirring blade 16 lies completely in the inner stirring blade plane 24. The inner stirring blade 16 has a plate-like design. Stirring device 10 has an inner stirring blade hub 66. The inner stirring blade 16 and the further inner stirring blade 48 are disposed on the inner stirring blade hub 66. The inner stirring blade 16 and the further inner stirring blade 48 are each arranged on the Innenrührblattnabe 66 by means of a welded connection. The Innenrührblattnabe 66 is attached to the stirrer shaft 12 by means of a screw connection. There are also other compounds of Innenrührblattnabe 56, for example, a clamp connection conceivable. An angular distance between the inner stirring blade 16 and the further inner stirring blade 48 is 180 °. In the case of several inner stirring blades, the individual inner stirring blades are arranged at an equidistant angular distance. The angular distance can be determined according to the relationship 360 ° / number of internal stirring blades.

When viewed along the inner blade tip normal 32, the inner blade 16 has a trapezoidal contour 68. The trapezoidal contour 68 has mutually perpendicular sides 96, 98, wherein one of the sides 96 parallel to the stirring shaft 12 and the other side 98 perpendicular to the stirring shaft 12 extends. The trapezoidal contour 68 has a further side 70, which runs parallel to the outer paddle plane 26.

The inner stirring blade 16, together with the further section 22 of the outer stirring blade 14, forms a blade-like conveying unit 20 of the stirring-device device 10. The conveying unit 20 is provided for conveying a medium in a direction parallel to the stirring shaft 12 and in a further direction perpendicular to the stirring shaft 12. This allows a radial flow of the medium, wherein the radial flow is directed in particular perpendicular to the stirring shaft 12, and a axial flow of the medium, wherein the axial flow is directed in particular parallel to the stirring shaft 12, arise.

The blade-like delivery unit 20 has a passage gap 28 (FIG. Fig. 1 ). The passage gap 28 is delimited by the further side 70 of the trapezoidal contour 68 of the inner stirring blade 16 and by the outer stirring blade plane 26.

An extension 30 of the passage gap 28 is adjustable. For example, the inner stirrer blade 16 is displaceable along the stirrer shaft 12. In addition, the inner stirring blade 16 may be rotatable about the stirring shaft 12. The inner stirring blade 16 can be fastened to the stirring shaft 12 in different angular positions relative to the outer stirring blade 14.

The passage gap 28 can either be completely closed or be opened to the maximum. The passage gap 28 is at a setting of the Innenrührblatts 16 perpendicular to the main extension direction of the spar 52 maximum size.

The bottom stirring blade 38 is arranged along the stirring shaft 12 below the outer stirring blade 14 and / or the inner stirring blade 16 ( Fig. 1 ).

The agitator device 10 has a Bodenrührblattebene 64. The soil stirring blade 38 lies completely in the soil stirring blade plane 64 (FIG. Fig. 6 ). The Bodenrührblatt 38 is plate-like. In a viewing direction parallel to a Bodenrührblattnormalen 74 of the Bodenrührblatt 38, the Bodenrührblatt 38 has a largest to the stirring shaft 12 parallel extension 106 between 5% of the diameter 102 and less than 50% of the diameter 102, more preferably 15% of the diameter 102. The agitation device 10 has a Bodenrührblattnabe 72. The bottom stirring blade 38 and the other bottom stirring blade 50 are disposed on the bottom stirring blade hub 72. The Bodenrührblatt 38 and the other Bodenrührblatt 50 are each arranged by means of a welded connection to the Bodenrührblattnabe 72. The Bodenrührblattnabe 72 is attached to the stirrer shaft 12 by means of a screw connection. There are also other connections of the Bodenrührblattnabe 72, for example, a clamp connection, imaginable. An angular distance between the Bodenrührblatt 38 and the other Bodenrührblatt 50 is 180 °. In the case of several soil stirring blades, the individual soil stirring blades are arranged at an equidistant angular distance. The angular distance can be determined by the relationship 360 ° / number of soil stirring blades.

Viewed along the bottom blade blade normal 74, the bottom blade 38 has a contour 76 which includes a convex side 78. The stirring element 46 can be arranged in a container 80. The convex side 78 is adapted to a bottom 82 of the container 80.

The soil stirring blade 38 can be fastened to the stirring shaft 12 in different angular positions relative to the outer stirring blade 14. The Bodenrührblatt 38 can be fastened in different angular positions relative to the Innenrührblatt 16. The angle settings can be adjusted by means of a rotation of the Bodenrührblattnabe 72 about the stirrer shaft 12.

The conveyor unit 20 and all other conveyor units, which are formed by further sections and further Innenrührblätter, always show in a same direction of rotation during a rotary movement of the Rührorganvorrichtung 10 to the agitator 60 in at least one operating condition.

FIG. 4 The outer stirring blade 14 and the further outer stirring blade 40 when viewed perpendicular to the stirring shaft 12. The outer stirring blade 14 and the further outer stirring blade 40 together form a closed curved outer contour 42. The curved outer contour 42 is formed as an ellipse 84. In an upper and a lower vertex area 86, 88 of the ellipse 84, when viewed perpendicular to the stirring shaft 12, the outer stirring blade 14 and the outer stirring blade 40 overlap. In areas where when viewed perpendicularly to the stirring shaft 12, the outer stirring blade 14 and the other outer stirring blade 40 overlap, there are joints of the spars 52, 54 with the outer paddle blade 14 and the other outer paddle blade 40. A lower third of the enclosed by an ellipse 84 surface 90 is closed.

The outer stirring blade 14 and the further outer stirring blade 14 when viewed perpendicular to the stirring shaft 12 together form the ellipse 84 with a non-elliptical recess 44. The recess 44 is in upper and lateral areas by respective arm-shaped portions 18, 92 of the outer stirring blade 14 and further External stirring blade 40 limited. The recess 44 is bounded in a lower region of the recess 44 by respective further sections 22, 94 of the outer stirring blade 14 and of the further outer stirring blade 40.

FIG. 7 shows a stirring system 100 with the arranged in the container 80 stirring member 46. The container 80 is provided for receiving a medium to be processed by the stirring member 46. The container 80 has a container diameter 110. The container diameter 110 is, in particular, at least a factor of 1.05 greater than the diameter 102 of the agitator device 10. The agitator 46 has at least one motor 112. The motor 112 is connected in particular to the stirring shaft 12. The engine 112 is intended to transmit torque to the agitator 46 in at least one operating condition. The stirring member 46 generates in at least one operating state a first flow which is directed perpendicular to the stirring shaft 12 and a second flow which is directed at least substantially parallel to the stirring shaft 12. The first flow is essentially due to the inner stirring blade 16. The second flow is essentially due to the outer stirring blade 14. The proportion of the first flow to a total flow is determined by the extent 30 of the passage gap 28.

reference numeral

10

Rührorganvorrichtung

12

agitator shaft

14

Außenrührblatt

16

Innenrührblatt

18

section

20

delivery unit

22

section

24

Innenrührblattebene

26

Außenrührblattebene

28

Passage gap

30

extension

32

Innenrührblattnormale

34

Außenrührblattnormale

36

normal angle

38

Bodenrührblatt

40

Außenrührblatt

42

outer contour

44

recess

46

stirrer

48

Innenrührblatt

50

Bodenrührblatt

52

Holm

54

Holm

56

Außenrührblattnabe

58

Außenrührblattnabe

60

stirring axis

62

angle of attack

64

Bodenrührblattebene

66

Innenrührblattnabe

68

contour

70

page

72

Bodenrührblattnabe

74

Bodenrührblattnormale

76

contour

78

convex side

80

container

82

ground

84

ellipse

86

Apex area

88

Apex area

90

surface

92

section

94

section

96

page

98

page

100

Mixing System

102

diameter

104

section thickness

106

expansion

108

Außenrührblattlänge

110

Container diameter

112

engine

Claims (18)

Stirring device (10), in particular agitator device (10), in particular for mixing low-viscosity to medium-viscosity media, with at least one stirring shaft (12) and with at least one, on the stirrer shaft (12) held Außenrührblatt (14), which in at least one Section (18) is arm-shaped, characterized by at least one Innenrührblatt (16) which forms at least one blade-like conveyor unit (20) together with the Außenrührblatt (14), which at least to a medium in at least one direction parallel to the stirring shaft (12 ) and in particular in at least one further direction perpendicular to the stirring shaft (12) is provided. Stirrer device (10) according to the preamble of and in particular according to claim 1, characterized in that the outer stirrer blade (14) has at least one further portion (22) adjacent to the portion (18) in which the outer stirrer blade (14) is wider than in the Section (18) is formed. Stirring device (10) according to claims 1 and 2, characterized in that the inner stirrer blade (16), together with the further portion (22) of the outer stirrer blade (14) forms the blade-like conveying unit (20). Stirring device (10) according to any one of the preceding claims, characterized in that the Innenrührblatt (16), at least for the most part, in particular completely, in a Innenrührblattebene (24) and is in particular plate-like. Stirring device (10) according to any one of the preceding claims, characterized in that the Außenrührblatt (14) is at least for the most part, in particular completely, in a Außenrührblattebene (26). Stirring device (10) according to any one of the preceding claims, characterized in that the blade-like conveying unit (20) has at least one passage gap (28). Stirring device (10) according to claim 6, characterized in that at least one extension (30) of the passage gap (28) is adjustable. Agitator device (10) according to one of the preceding claims, characterized in that the inner stirring blade (16), at least one Innenrührblattnormale (32) and the outer stirring blade (14) at least one Außenrührblattnormale (34), wherein the Innenrührblattnormale (32) and the Außenrührblattnormale ( 34) include a minimum normal angle (36) greater than 0 ° and at most 90 °. Stirring device (10) according to claim 8, characterized in that the minimum normal angle (36) is adjustable. Stirrer device (10) according to any one of the preceding claims, characterized in that the Innenrührblatt (16), in different angular positions relative to the Außenrührblatt (14) on the stirrer shaft (12) can be fastened. Stirring device (10) according to one of the preceding claims, characterized by at least one spar (52, 54), via which the outer stirring blade (14) is connected to the stirrer shaft (12). Stirrer device (10) according to one of the preceding claims, characterized by at least one bottom stirring blade (38) which is arranged along the stirrer shaft (12) below the outer stirrer blade (14) and / or the inner stirrer blade (16). Stirring device (10) according to claim 12, characterized in that the Bodenrührblatt (38) in different angular positions relative to the Außenrührblatt (14) on the stirrer shaft (12) can be fastened. Stirring device (10) according to one of the preceding claims, characterized by at least one further outer stirring blade (40), which is formed analogously to the outer stirring blade (14). Stirrer device (10) according to claim 14, characterized in that the outer stirrer blade (14) and the further outer stirrer blade (40) at least one viewing perpendicular to the stirrer shaft (12) together form a closed curved outer contour (42). Stirrer device (10) according to claim 14 or 15, characterized in that the outer stirrer blade (14) and the further outer stirrer blade (40) at least one viewing perpendicular to the stirrer shaft (12) together an ellipse (84) with a non-elliptical recess (44 ) form. Stirring element (46) with at least one stirring device (10) according to one of the preceding claims. Stirring system (100) with at least one container (80) and with at least one stirring element (46) arranged in the container (80) according to claim 17.

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