EP3386619A1

EP3386619A1 - Agitator device

Info

Publication number: EP3386619A1
Application number: EP16797816.2A
Authority: EP
Inventors: Nicole Rohn; Hans-Jürgen WEISS; Bernd NIENHAUS
Original assignee: EKATO Ruehr und Mischtechnik GmbH
Current assignee: EKATO Ruehr und Mischtechnik GmbH
Priority date: 2015-12-10
Filing date: 2016-11-10
Publication date: 2018-10-17
Anticipated expiration: 2036-11-10
Also published as: TW201720518A; CA3007686C; ES2975365T3; WO2017097530A1; US20180345233A1; AU2016368953B2; US11059006B2; BR112018011513A2; BR112018011513B1; CN109070028A; CL2018001525A1; RU2018124647A3; RU2018124647A; TWI721053B; ZA201804447B; RU2729276C2; AU2016368953A1; DE102015121513A1; CA3007686A1; CN109070028B

Abstract

Disclosed is an agitator device, in particular a draft tube agitator device, comprising at least one agitator unit (12a; 12b) that can rotate about a rotational axis (10a) and that is provided for the delivery of a fluid in an axial delivery direction (16a; 16b). The agitator unit has at least one rotor blade element (18a), a section of which that projects on a plane perpendicular to the rotational axis (10a) having an at least substantially arced outer contour (20a), and the rotor blade element (18a) has at least one first substantially planar region (24a) lying on a blade plane (22a) and a second region (26a) curving away from the blade plane (22a).

Description

stirrer

State of the art

The invention relates to a stirring device, in particular a

Leitrohrrührvorrichtung, according to the preamble of claim 1.

From the prior art Leitrohrmischer are already known with an arranged in a guide tube stirrer.

The object of the invention is in particular to provide a generic stirring device with improved fluidic properties. The object is achieved by the characterizing features of claims 1 and 6, while advantageous

Refinements and developments of the invention can be taken from the dependent claims.

ADVANTAGES OF THE INVENTION The invention is based on a stirring device, in particular a

Leitrohrrührvorrichtung, with at least one rotatable about a rotation axis Rühreinheit which is provided for conveying a fluid in an axial conveying direction and which has at least one rotor blade element whose projection on a plane perpendicular to the axis of rotation comprises an at least substantially circular arc-shaped outer contour.

It is proposed that the rotor blade element comprises at least one first region lying in a leaf plane, at least substantially flat, and a second region curved out of the leaf plane. , ,

By "provided" is meant in particular specially programmed, designed and / or equipped.Under that an object is intended for a particular function, should be understood in particular that the object that particular function in at least one application and / or

Operating condition fulfilled and / or executes. A "stirring device" is intended in particular to include a component, in particular a functional component, in particular a design and / or functional component, a mixer and / or an agitator, in particular for a fluid, in particular at a maximum

Speed of 500 rpm, advantageously of 200 rpm, particularly advantageously of 100 rpm, preferably of 50 rpm understood. In particular, the

Stirrer also include the entire mixer and / or the entire agitator. Preferably, the stirring device is designed as a Leitrohrrührvorrichtung. Under a "Leitrohrrührvorrichtung" should in particular a

Design and / or functional component, a Leitrohrmischers and / or Leitrohrrührwerks, in particular for a fluid to be understood.

In particular, the Leitrohrrührvorrichtung also the entire

Includes Leitrohrmischer and / or the entire Leitrohrrührwerk. In this context, a fluid should in particular be a liquid or a suspension or a dispersion, in particular with a liquid

Carrier medium, to be understood. Particularly preferably, the

Leitrohrmischer and / or the Leitrohrrührwerk at least one, in particular vertical, guide tube and / or at least one stirring container. A "guide tube" is to be understood here as meaning, in particular, a hollow cylinder which is provided for guiding a fluid, in particular in a vertical direction, in particular at least substantially parallel to a surface normal of a substrate an orientation of a direction relative to a reference direction, in particular in a plane, understood, the direction opposite to the

Reference direction has a deviation, in particular less than 8 °, advantageously less than 5 ° and particularly advantageously less than 2 °. In particular, a main extension direction of the guide tube extends in a vertical direction. Under one , ,

In this case, the "main extension direction" of an object is to be understood to mean, in particular, a direction which runs parallel to a longest edge of a smallest imaginary cuboid which just completely encloses the object.Alternatively, in at least one normal operating state of the stirrer, the rotation axis runs at least substantially parallel to a vertical one Direction, in particular parallel to the surface normal of a subsoil.

Preferably, the stirring unit is as a stirring member, in particular as a

Leitrohrpropeller, trained. Particularly preferably, the stirring unit has at least one, in particular centrally arranged, hub element. Particularly preferably, the axis of rotation passes through the hub member. The stirring unit, in particular the hub element of the stirring unit, is advantageously provided for mounting on at least one drive shaft. Particularly advantageously, the hub member is connected by means of a force and / or positive connection with the drive shaft, for example by means of terminals and / or screws and / or a NutVFeder connection. But it is also conceivable that the

Stirring unit, in particular the hub member of the stirring unit, is integrally connected to the drive shaft. By "one piece" should be understood in particular connected at least cohesively, 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

Manufacture from a casting and / or by a production in a one- or multi-component injection molding process and advantageously from a single blank. In particular, the stirring unit is provided for stirring at a maximum speed of 500 rpm, advantageously 200 rpm, more preferably 100 rpm, preferably 50 rpm. Preferably, the stirring unit is closed

at least a large part from a against, in particular organic,

Solvent and / or acids and / or bases made of resistant material, in particular of a ceramic or a ceramic composite material. , _

Particularly preferably, the stirring unit is made of at least a large part of a metal and / or of a metal alloy, in particular of steel and / or stainless steel. But it is also conceivable that the stirring unit is made of plastic at least a large part. Furthermore, it is conceivable that the stirring unit has an, in particular additional, at least partial coating, for example with a metal oxide and / or a, in particular corrosion-resistant, polymer, and / or rubberized. Under the

At least 55%, advantageously at least 65%, preferably at least 75%, particularly preferably at least 85%, and particularly advantageously at least 95% are to be understood as meaning "at least a large part." Preferably, the conveying direction is at least

Essentially parallel to the axis of rotation.

In this context, it should be understood, in particular, that an annular object surrounding the object has an inner radius and an outer radius that is at most 20%, advantageously at most 15%, below that an object is "at least substantially circular-arc-shaped". Particularly advantageously, at most 10%, preferably at most 5% and particularly preferably at most 2%, differ Advantageously, a projection of the rotor blade element on at least one plane containing the axis of rotation at least one at least substantially rectilinear

Top or bottom on. Preferably, the rotor blade element is made of at least a large part of a material which is resistant to, in particular, organic, solvents and / or acids and / or bases, in particular of a ceramic or a ceramic composite material. Particularly preferably, the rotor blade element is made of at least a large part of a metal and / or of a metal alloy, in particular of steel and / or stainless steel. But it is also conceivable that the rotor blade element is made at least a major part of a plastic. Furthermore, it is conceivable that the rotor blade element has an, in particular additional, at least partial coating, for example with a metal oxide and / or a, in particular , ,

corrosion-resistant, polymer, and / or rubberized is formed. Advantageously, the rotor blade element is integrally connected to the hub member. But it is also conceivable that the rotor blade element is connected by means of screws and / or rivets to the hub member. In particular, the leaf level corresponds to a main extension plane of the first region. A "main extension plane" of an object should be understood to mean, in particular, a plane which is parallel to a largest side surface of a smallest imaginary cuboid which just completely surrounds the object, and in particular runs through the center of the cuboid second area that

Rotor blade element off. Particularly advantageously, the second region has an at least substantially constant radius of curvature. An "at least essentially constant value" in this context should be understood as meaning, in particular, a variation of the value of at most 20%, advantageously at least 15%, particularly advantageously at least 10% and preferably at least 5%

The boundary line between the first region and the second region has an at least substantially straight course. An "at least substantially straight course" of a line is to be understood in particular as meaning that a smallest box enclosing the line has at least one longest side which is at least 10 times, advantageously at least 20 times, particularly advantageously at least 50 times, preferably at least 100 times and more preferably at least 200 times as long as a second longest side of the cuboid, and that for each point on the line, an angle between a tangent in the point and the longest side of the cuboid is at most 10 °, advantageously at most 8 °, especially is advantageously at most 5 °, preferably at most 3 ° and particularly preferably at most 2 °, The second region particularly preferably comprises at least one corner, particularly preferably exactly two corners, of the rotor blade element - -

Area and / or the second area over an entire width of

Rotor blade element.

The embodiment according to the invention makes it possible, in particular, to achieve an advantageous flow during mixing and / or stirring. Furthermore, advantageously a high efficiency can be achieved. Advantageously, a geometry can be adjusted in a simple manner. In particular, a high homogeneity of a flow velocity can advantageously be achieved. Furthermore, an advantageous homogenization of a mixed fluid can be achieved. In particular, dead spaces and / or caking and / or encrustations can be avoided. Furthermore, advantageously, a homogeneous flow, in particular in a guide tube, can be achieved. Furthermore, can advantageously be a product-friendly

Promotion achieved and / or acting shear forces, for example, on stirred and / or growing particles and / or crystals can be reduced.

In an advantageous embodiment of the invention, it is proposed that the second region is arranged radially further outward than the first region.

Preferably, the first region has on at least one side an outer contour which is provided for a positive connection with the hub element. Preferably, the second region has the circular arc-shaped outer contour. As a result, advantageously a high delivery rate can be achieved. Furthermore, this can advantageously achieve a homogeneous delivery of a fluid.

In a particularly advantageous embodiment of the invention, it is proposed that the rotor blade element has an inner edge facing the axis of rotation and an outer edge facing away from the axis of rotation, which is longer than the inner edge. Advantageously, the inner edge runs over at least a major part of its length along the hub element. Particularly advantageously, the inner edge and / or the outer edge is at least substantially

elliptical arc-shaped. Under that an object "at least in

Essentially elliptical arc-shaped "is intended in this context

in particular be understood that a smallest, the object surrounding , ,

Ellipse ring piece has an inner edge and an outer edge, which extend at a distance corresponding to at most 20%, preferably at most 15%, more preferably at most 10%, preferably at most 5% and most preferably at most 2% of a length of the outer edge. This can advantageously a rotor blade with a large conveying surface

to be provided. Furthermore, this advantageously a fluidically favorable geometry can be achieved, which in particular favorably influence a secondary flow and / or can improve efficiency.

Preferably, at least a majority of the rotor blade element has an at least substantially constant blade thickness. At least 60%, advantageously at least 70%, particularly advantageously at least 80%, preferably at least 90% and particularly preferably at least 95% are to be understood as meaning "at least a large part." In particular, the rotor blade element may be in a region of one or more edges In this context, a "blade thickness" should be understood to mean in particular a thickness of the rotor blade element, in particular a thickness along a direction which extends at least substantially parallel to a surface normal of an upper side and / or a lower side of the rotor blade element. The terms "top" and "bottom" relate in particular to a consideration of the rotor blade element in the direction of the axis of rotation. This is advantageous

Rotor blade element formed as an at least partially curved plate and / or as an at least partially curved sheet. This can be advantageously achieved a cost and / or time savings in a production. Furthermore, this advantageously a high rigidity can be achieved.

Particularly preferably, at least one projection of at least a majority of the rotor blade element exists on at least one plane for which the projected blade thickness is constant. In particular, at least one exists

Viewing direction, along which a thickness of the rotor blade element of - -

Sheet thickness corresponds. As a result, advantageously a complexity of a production can be reduced.

In a further aspect, the invention is based on a stirring device, in particular a Leitrohrrührvorrichtung, with at least one rotatable about a rotation axis stirring unit, which is provided for conveying a fluid in an axial conveying direction and which at least one

Rotor blade member having a projection on a plane perpendicular to the axis of rotation comprises an at least substantially circular arc-shaped outer contour. It is proposed that the stirring device has a casing unit, which is provided for connection to a guide tube, which has at least one front baffle, which in the conveying direction in front of the

Stirring unit is arranged, and which defines an interior, in which in an assembled state, the stirring unit and at least a first region of the guide plate are arranged.

Advantageously, the stirring device has at least one bottom unit, which is connected to one, in particular one-piece and / or non-positive and / or

interlocking, connection is provided with the sheathing unit, for example by means of welding and / or screws and / or clamps and / or rivets. Particularly advantageously, the stirring device comprises a

Container unit, which is provided for a, in particular one-piece, connection to the ground unit and / or with the sheathing unit.

Preferably, the bottom unit has at least one circumferential flange, which in an assembled state can be connected to the container unit, in particular to a peripheral flange of the container unit.

Preferably, the sheathing unit can be inserted in a guide tube. Particularly preferably, the sheathing unit has, at least in an upper region, an outer cross section which corresponds to an inner cross section of the guide tube. Advantageously corresponds to an outer diameter of the , ,

Sheath unit in the upper region at least substantially an inner diameter of the guide tube. In this context, the term "at least essentially" should be understood in particular to mean that a deviation from a predefined value corresponds in particular to less than 15%, preferably less than 10% and particularly preferably less than 5% of the predetermined value of the

Sheath unit in the mounted state within the guide tube.

Preferably, the sheathing unit surrounds the interior at least to all sides parallel to the axis of rotation. Advantageously, a projection of the sheathing unit on a plane perpendicular to the axis of rotation completely surrounds a projection of the stirring unit onto the plane. In particular, a surface area of a differential area of a smallest projection surrounding the stirring unit on a plane perpendicular to the axis of rotation and an internal cross section of the sheathing unit perpendicular to the axis of rotation is at most 20%, advantageously at most 15%, particularly advantageously at most 10%, preferably at most 5% and more preferably at most 3% of a surface area of the inner cross section of the sheath unit.

Preferably, the sheathing unit is made of at least a large part of a material that is resistant to, in particular, organic, solvents and / or acids and / or bases, in particular of a ceramic or a

Ceramic composite material. Particularly preferably, the sheathing unit is made of at least a large part of a metal and / or of a metal alloy, in particular of steel and / or stainless steel. But it is also conceivable that the sheathing unit to at least a large part of a

Plastic is made. Furthermore, it is conceivable that the rotor blade element has an, in particular additional, at least partial coating,

for example, with a metal oxide and / or a, in particular

corrosion-resistant, polymer, and / or rubberized is formed. Advantageously, a projection of the sheathing unit on a plane perpendicular to the axis of rotation has an at least substantially circular inner - -

Cross-section and / or an at least substantially circular outer cross section. Under a "at least substantially circular

Cross-section "of an object is to be understood in particular that for at least 60%, advantageously for at least 70%, particularly advantageous for at least 80% and preferably for at least 90% of all cross-sections of

Object along at least one direction, a surface area of a differential area of the cross section and a smallest circle surrounding the cross section is at most 30%, preferably at most 20%, more preferably at most 10% and preferably at most 5% of the area of the circle. Preferably, the sheathing unit has at least one rear guide plate, which is arranged behind the stirring unit in the mounted state in the conveying direction. Particularly preferably, the rear baffle is arranged in the assembled state in the interior.

Advantageously, at least a majority of the baffle has at least one

Essentially constant thickness. In particular, the baffle may have a different thickness in a region of one or more edges.

Particularly advantageously, the guide plate is formed from a plate and / or a metal sheet. Preferably, the baffle is made to at least a large extent from a, in particular organic, solvent and / or acids and / or bases resistant material, in particular a ceramic or a

Ceramic composite material. The baffle is particularly preferably at least largely made of a metal and / or a metal alloy,

especially made of steel and / or stainless steel. But it is also conceivable that the baffle is made at least a large part of a plastic. In particular, when viewed perpendicular to the

Rotation axis, an area of the first portion of the baffle at least 10%, preferably at least 20%, more preferably at least 30% of a surface area of the baffle. Preferably, the first region of the

Guide plate and / or at least one vertical projection of the baffle on a plane parallel to the axis of rotation at least substantially - -

rectangular cross section on. Under a "at least essentially

rectangular cross section "of an object is to be understood in particular that for at least 60%, advantageously for at least 70%, particularly advantageous for at least 80% and preferably for at least 90% of all

Cross sections of the object along at least one direction, a surface area of a differential area of the cross section and a smallest rectangle surrounding the cross section is at most 30%, preferably at most 20%, more preferably at most 10%, preferably at most 5% and most preferably at most 5% of the area of the rectangle , Preferably, in the assembled state, at least one side of the first region of the baffle extends at least substantially parallel to the axis of rotation. In particular, it is also conceivable that the stirring device is mounted and / or operable such that an alternative second promotion of a fluid in an alternative second, in particular the conveying direction opposite, alternate second conveying direction. The guide plates can then be located behind the stirring device, in particular in the alternative second conveying direction.

Furthermore, a geometry of the sheathing unit in this case

in particular unchanged and / or as described herein and / or have at least a changed geometry of the baffle. The embodiment according to the invention makes it possible, in particular, to achieve an advantageous flow during mixing and / or stirring. Furthermore, advantageously a high efficiency can be achieved. Advantageously, a geometry can be adjusted in a simple manner. Particularly advantageously, a size of the stirring unit of a size of a conveying and / or mixing space can be precisely adjusted. In particular, can advantageously a high homogeneity of a

Flow rate can be achieved. Furthermore, an advantageous

Homogenization of a mixed fluid can be achieved. In particular, you can

Dead spaces and / or caking and / or encrustations are avoided. Furthermore, advantageously, a homogeneous flow, in particular in a guide tube, can be achieved. Furthermore, a product-friendly promotion can advantageously be achieved - -

and / or acting shear forces, for example, on stirred and / or growing particles and / or crystals can be reduced.

Furthermore, it is proposed that the interior is at least substantially cylindrical. An "at least substantially cylindrical object" is to be understood in particular as meaning that a difference volume of the object and a smallest cylinder surrounding the object is at most 30%, advantageously at most 20%, particularly advantageously at most 10% and preferably at most 5% of the volume of the cylinder is.

In particular, a smallest circle surrounding a projection of the stirring unit on a plane perpendicular to the axis of rotation has a radius which is at most 20%, advantageously at most 10%, particularly advantageously at most 5% and preferably at most 3% smaller than a radius of a smallest inner space surrounding cylinder. Preferably, the axis of rotation forms a cylinder axis of the cylinder. As a result, advantageously a precisely matched geometry can be achieved. Furthermore, this can be advantageous to the

Casing unit adapted to the stirring unit.

It is also proposed that in the assembled state a

Main extension plane of the baffle is arranged at least substantially parallel to the conveying direction. Advantageously, for at least a majority of all points of the baffle, a surface normal passes through the respective point at least substantially perpendicular to the axis of rotation. As a result, it is advantageous to supply a fluid to the stirring unit and / or to a mixing and / or conveying space. Furthermore, this can be achieved by a favorable flow of the fluid. Furthermore, this advantageously allows a substantially homogeneous flow velocity to be achieved.

Furthermore, it is proposed that a projection of the guide plate on a plane perpendicular to the axis of rotation follows a curved course. Preferably, a projection of the baffle on a plane perpendicular to the

Rotation axis has a thickness which is at least substantially a thickness of - -

Guide plate corresponds. Advantageously, a projection of the guide plate on a plane perpendicular to the axis of rotation at least a first, planar region and at least a second, curved region. Particularly advantageously, the curved course has an at least substantially constant

Radius of curvature on. This can advantageously a high

Torsional rigidity and / or high strength can be achieved. Furthermore, this advantageously a favorable flow of the stirring unit can be achieved.

In a preferred embodiment of the invention it is proposed that the baffle has at least a second region, which is arranged in the mounted state in the conveying direction in front of the interior and extends in the radial direction further than the interior. Preferably, a portion of the second region that is located radially farther outward than the interior space has a curved region when viewing the baffle along the axis of rotation. In particular, an extension of the second region along the axis of rotation corresponds to at least 10%, advantageously at least 20%, particularly advantageously at least 30%, preferably at least 40% and

more preferably, at least 50% of an extension of the baffle along the axis of rotation. In this context, an "extension along a direction" of an object is intended in particular to be a maximum distance between two points of a vertical projection of the object onto a plane

be understood that is parallel to the direction. As a result, advantageously, a fluid of the stirring unit can be supplied from below. In a particularly preferred embodiment of the invention, it is proposed that the

Sheath unit at a front end in the conveying direction

Radial extension, which is at a distance of a radial from the

Rotary axis farthest point of the baffle corresponds to the axis of rotation. Advantageously, a radially farthest edge of a projection of the baffle lies on a plane perpendicular to the axis of rotation on a smallest circle surrounding a projection of the jacket unit on the plane. - -

Particularly advantageously, a radially farthest edge of the guide plate extends at least substantially parallel to the axis of rotation. In this way, a fluidically favorable geometry of the sheathing unit, in particular in an inlet region of a fluid, can be provided. It is also proposed that the sheathing unit be attached to an in

The conveying direction front side has an outer contour which is formed at least substantially in the form of a truncated cone shell. In particular, an extension of the outer contour along a direction parallel to the axis of rotation corresponds to at least 10%, advantageously at least 20%, particularly advantageously at least 30%, preferably at least 40% and particularly preferably at least 50% of an extension of the sheathing unit along the

Direction. Advantageously, an angle between the truncated cone casing and a cone axis is at most 45 °, particularly advantageously at most 30 °,

preferably at most 20 ° and more preferably at least 15 °. This can advantageously be increased stability of the sheathing unit.

Furthermore, it is proposed that the sheathing unit along the

The conveying direction has an extension which is at least twice as large, advantageously at least three times as large, more preferably at least four times as large, preferably at least five times as large and more preferably at least six times as large as an extension of the stirring unit along the conveying direction. This can advantageously a homogeneous

Flow rate can be achieved.

Furthermore, a mixer, in particular a draft tube mixer, with at least one stirring device and with the guide tube, which has an inner cross section in an area of the connection to the jacket unit, which at least substantially corresponds to an outer cross section of the jacket unit in the region of the connection, is proposed.

In addition, a method for producing at least one transition and / or end product from at least one starting product, with the - -

Stirring proposed, wherein the starting product by means of

Stirring unit is stirred. Preferably, the starting product is formed as a fluid. As a result, a high product quality and / or homogeneity can advantageously be achieved. Furthermore, this can advantageously achieve a time and / or cost-efficient production.

The stirring device according to the invention should not be limited to the above

described application and embodiment be limited. In particular, in order to fulfill a mode of operation described herein, the stirring device according to the invention may have a number deviating from a number of individual elements, components and units mentioned herein.

drawings

Further advantages emerge from the following description of the drawing. In the drawings, two embodiments of the invention are 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.

Show it:

Fig. 1 shows a mixer with a stirring device in a perspective

Sectional view

Fig. 2 shows an arrangement of baffles of a sheathing unit of

Stirring device in a schematic plan view,

Fig. 3 is a stirring unit of the stirring device in a perspective

Presentation,

4 shows the stirring unit in a schematic plan view,

5 shows a rotor blade element of the stirring unit in a perspective view

Presentation, - -

Fig. 6, the rotor blade element viewed along a direction VI in

FIG. 5,

Fig. 7, the rotor blade element viewed along a direction VII in

FIG. 5,

8 is an exemplary flowchart for a method for

Preparation of a product from a starting product with the stirring device and

9 shows an alternative mixer with an alternative stirring device in a perspective sectional view. Description of the embodiments

In the embodiment described below, various structural units and / or components are present multiple times. Analog configured components and / or assemblies that in the drawings with the same

Reference numerals are for simplicity in the following description of the drawing described only once.

FIG. 1 shows a mixer 54a with a stirring device in one

perspective sectional view. The mixer 54a has a guide tube 38a. A main extension direction of the guide tube 38a extends in the present case in a vertical direction. The stirring device is designed as a Leitrohrrührvorrichtung. The stirring device has a stirring unit 12a, which is rotatable about a rotation axis 10a. The stirring unit 12a has a centrally arranged hub element 62a. Furthermore, in the present case, the stirring unit 12a has three rotor blade elements 18a. However, it is also conceivable a different number of rotor blade elements, such as two or four or five or six or eight or ten. The stirring unit 12a is provided for conveying a fluid (not shown in FIG. 1) in a conveying direction 16a. In the present case, the conveying direction 16a runs at least substantially parallel to a vertical direction. The conveying direction 16a runs in

present case parallel to the axis of rotation 10a. The conveying direction 1 6a - -

goes up in the present case. But it is also conceivable that a conveying direction runs down.

In the present case, the stirring device has a bottom unit 64a. The floor unit 64a has a circumferential flange 68a. Furthermore, the stirring device has a container unit 66a. The container unit 66a has a circumferential flange 70a. The tank unit 66a is connected to the flange 68a of the floor unit 64a via the flange 70a of the tank unit 66a.

The stirring device has a casing unit 36a. In the present case, the sheathing unit 36a has a wall element 76a. Further, in the present case, the sheath unit 36a is connected to the floor unit 64a. The sheathing unit 36a defines an interior 42a. In the present case, the wall element 76a defines the interior 42a. Further, in the present case, the inner space 42a has a cylindrical shape. Furthermore, in the present case, the axis of rotation 10a forms a cylinder axis 72a of the

Interior 42a off. The sheath unit 36a is provided for connection to the guide tube 38a. The guide tube 38a has, in a region 56a of the connection with the sheathing unit 36a, an inner cross section 58a which at least substantially corresponds to an outer cross section 60a of the

Sheath unit 36a in the area 56a of the connection corresponds. The sheathing unit 36a has a guide plate 40a. A

Main extension plane of the baffle 40a is parallel to the

Conveying direction 16a. The baffle 40a has a first region 44a, which is arranged within the inner space 42a. A projection of the first region 44a onto a plane parallel to the axis of rotation 10a has an at least substantially rectangular cross-section. The baffle 40a has a second region 46a, which is arranged in the conveying direction 1 6a in front of the interior 42a. The second region 46a extends in the radial direction further than the inner space 42a. The baffle 40 a is positively connected to the

Wall element 76a connected. In the present case, the - -

Shroud unit 36 a total of five baffles 40 a, which are formed at least substantially identical (see Figure 2). In the event that one

Conveying direction runs in an opposite direction, at least one baffle may have a different curvature than described here and / or adapted adapted to a changed flow.

The sheathing unit 36a has, at a forward end 74a in the conveying direction 16a, a radial extent which is at a distance from a point 48a of the guide plate 40a which is farthest from the axis of rotation 10a

Rotation axis 10a corresponds. In the present case, the point 48a is located on a radially outer edge 77a of the baffle 40a.

The sheathing unit 36a has an outer contour 52a on a front side 50a in the conveying direction 16a, which is formed at least substantially in the shape of a truncated cone shell. In the present case, an angle between the truncated cone surface and a cone axis is about 18 °. Further, in the present case, the cone axis corresponds to the rotation axis 10a. Further, the sheath unit 36a along the conveying direction 1 6a a

Extension, which is at least twice as large, in the present case about seven times as large as an extension of the stirring unit 12a along the conveying direction 16a. In the present case, the stirring unit 12a, the sheathing unit 36a, the bottom unit 64a, the container unit 66a and the guide tube 38a are at least substantially made of stainless steel.

2 shows an arrangement of the guide plates 40a of the sheathing unit 36a in a schematic plan view, viewed in the direction of the axis of rotation 10a (see FIG. The baffles 40a are uniformly distributed along a circumference of the bottom unit 64a. When viewed in the direction of the axis of rotation 10a (see FIG. 1), the guide plates 40a each have a radially inner first region 78a with a straight course and a radially outer second region 80a with a curved course. The second area 80a - -

each has a constant radius of curvature. In the present case, all points of the first region 78a with respect to the axis of rotation 10a are located radially further inside than an inner wall 81a of the wall element 76a (see FIG. Figure 3 shows the stirring unit 12a of the stirring device in a perspective view. The rotor blade elements 18a of the stirring unit 12a are welded in the present case to the hub member 62a of the stirring unit 12a. in the

In the present case, the stirring unit 12a has a diameter of about 500 mm. However, it is also conceivable that a stirring unit has a different diameter, such as a diameter of about 250 mm, or a diameter of about 1000 mm, or a diameter of about 1500 mm, or a diameter of about 2000 mm, or a diameter of about 3000 mm.

FIG. 4 shows the stirring unit 12a in a schematic plan view along the axis of rotation 10a (see FIG. In a viewing in the direction of the rotation axis 10a (see FIG. 1), each rotor blade element 18a has an arcuate outer contour 20a in each case.

FIG. 5 shows one of the rotor blade elements 18a of the stirring unit 12a in a perspective view. The rotor blade element 18a has a constant blade thickness 32a. In the present case, the sheet thickness of

Rotor blade element 18a about 5 mm. However, it is also conceivable that a rotor blade has a different blade thickness, such as a blade thickness of about 2 mm, or a blade thickness of about 10 mm, or a blade thickness of about 20 mm, or a blade thickness of about 30 mm, or a blade thickness of about 50 mm, or a blade thickness of about 70 mm. The rotor blade element 18a has a flat first region 24a lying in a plane 22a and a second region 26a curved out of the plane 22a. The first region 24a and the second region 26a together form the rotor blade element 18a. In the present case, two corners 82a, 84a of the rotor blade element , -

18a curved out of the sheet plane 22a out. Further, in the present case, the second region 26a includes the two corners 82a, 84a. An imaginary

The boundary line 86a between the first area 24a and the second area 26 has a straight course. The first area 24a has a

elliptical arc-shaped portion 88a, which is provided for a positive connection with the hub member 62a of the stirring unit 12a. The second region 26a is located radially further outward than the first region 24a with respect to the axis of rotation 10a (see FIG.

The rotor blade element 18a has an inner edge 28a facing the rotational axis 10a (see FIG. 1) and an outer edge 30a facing away from the rotational axis 10a (see FIG. 1), which is longer than the inner edge 28a.

FIG. 6 shows the rotor blade element 18a viewed along a direction VI in FIG. 5. A projection of the rotor blade element 18a onto a plane perpendicular to the direction VI in FIG. 5 has a constant projected blade thickness 34a. In the present case, the projected blade thickness 34a corresponds to the blade thickness 32a.

FIG. 7 shows the rotor blade element 18a viewed along a direction VII in FIG. 5. A projection of the inner edge 28a of the rotor blade element 18a onto a plane perpendicular to the direction VII in FIG. 5 has a straight course.

FIG. 8 shows an example flow diagram for a method for producing a product and / or a transition product from at least one

Starting product with the stirrer. In a first method step 90a, the starting product is provided. In a second method step 92a, the starting product is stirred by means of the stirring unit 12a of the stirring device. In a third method step 94a, a further processing and / or a completion of the product and / or the transition product takes place. It is conceivable that the method steps 90a, 92a, 94 are iterated. Furthermore, a stable feeding of the starting product and / or a constant discharge of the transition product and / or the product is conceivable. - -

FIG. 9 shows a further exemplary embodiment of the invention. The following descriptions and the drawings are essentially limited to the differences between the exemplary embodiments, wherein, with regard to identically named components, in particular with regard to components having the same reference numbers, in principle also to the drawings and / or the description of the other embodiment, in particular FIGS to 8, can be referenced. To distinguish the embodiments of the letter a is the reference numerals of the embodiment in the figures 1 to 8 adjusted. In the embodiment of Figure 9, the letter a is replaced by the letter b.

Figure 9 shows an alternative mixer 54b with an alternative stirring device in a perspective sectional view. The stirring device has a stirring unit 12b, which is provided for conveying a fluid, not shown, in a vertical conveying direction 16b. The alternative stirring device has a sheathing unit 36b. The sheath unit 36b defines an interior 42b. The sheathing unit 36b has rear guide plates 96b, which are arranged in the conveying direction 16b behind the stirring unit 12b. The baffles 96b are disposed in the inner space 42b.

, -

reference numeral

10 rotation axis

12 stirring unit

16 conveying direction

18 rotor blade element

20 outer contour

22 leaf level

24 first area

26 second area

28 inner edge

30 outer edge

32 sheet thickness

34 projected leaf thickness

36 sheathing unit

38 draft tube

40 baffle

42 interior

44 first area

46 second area

48 point

50 page

52 contour

54 mixers

56 area

58 cross section

60 cross section

62 hub element

64 ground unit

66 container unit

68 flange , -

flange

cylinder axis

front end

wall element

edge

first area

second area

wall

corner

boundary line

subregion

step

baffle

Claims

claims

1 . Stirring device, in particular Leitrohrrührvorrichtung, with at least one about a rotation axis (10a) rotatable stirring unit (12a, 12b), which is provided for conveying a fluid in an axial conveying direction (1 6a, 1 6b) and which has at least one rotor blade element (18a) whose projection is perpendicular to the plane

Rotation axis (10a) comprises an at least substantially circular arc-shaped outer contour (20a), characterized in that the

Rotor blade element (18a) at least one lying in a sheet plane (22a), at least substantially planar first region (24a) and from the sheet plane (22a) out curved second region (26a).

2. Stirring device according to claim 1, characterized in that the second region (26a) is arranged radially further outside than the first region (24a).

3. Stirring device according to claim 1 or 2, characterized in that the rotor blade element (18a) has an axis of rotation (10a) facing the inner edge (28a) and one of the rotation axis (10a) facing away from the outer edge (30a), which is longer than that

Inner edge (28a).

4. Stirring device according to one of the preceding claims, characterized in that the at least a major part of

Rotor blade element (18a) has an at least substantially constant blade thickness (32a).

5. Stirring device according to claim 4, characterized in that

at least one projection of at least a majority of the

Rotor blade member (18a) exists on at least one plane for which the projected blade thickness (34a) is constant.

6. Stirring device, in particular Leitrohrrührvorrichtung, after the

The preamble of claim 1 and in particular according to one of

previous claims, characterized by a

Sheathing unit (36a, 36b) which is provided for connection to a guide tube (38a) which has at least one guide plate (40a) which is arranged in the conveying direction (16a, 16b) in front of the stirring unit (12a, 12b), and which defines an interior space (42a; 42b) in which, in an assembled state, the stirring unit (12a; 12b) and at least a first area (44a) of the baffle (40a) are arranged.

7. Stirring device according to claim 6, characterized in that the

Interior (42a, 42b) is at least substantially cylindrical.

8. Stirring device according to one of claims 6 or 7, characterized

characterized in that in the assembled state a

Main extension plane of the guide plate (40a) at least substantially parallel to the conveying direction (1 6a; 1 6b) is arranged. Stirring device according to one of claims 6 to 8, characterized

characterized in that the one projection of the guide plate (40a) on a plane perpendicular to the axis of rotation (10a) follows a curved course.

Stirring device according to one of claims 6 to 9, characterized

characterized in that the baffle (40a) has at least one second region (46a) which in the mounted state in

Conveying direction (1 6a, 16b) is arranged in front of the inner space (42a, 42b) and extends further in the radial direction than the inner space (42a, 42b).

Stirring device according to one of claims 6 to 10 characterized

in that the sheathing unit (36a, 36b) has, at a front end in the conveying direction (16a, 16b), a radial extent which is at a distance from one axis radially of the axis of rotation (10a).

farthest point (48 a) of the baffle (40 a, 40 b) of the

Rotation axis (10a) corresponds.

Stirring device according to one of claims 6 to 11, characterized

characterized in that the sheathing unit (36a, 36b) has an outer contour (52a) on a front side (50a) in the conveying direction (16a, 16b) which is at least substantially in the form of a

Truncated cone shell is formed.

Stirring device according to one of claims 6 to 12, characterized

in that the sheathing unit (36a, 36b) along the conveying direction (16a, 16b) has an extension that is at least twice as large as an extension of the stirring unit (12a, 12b) along the conveying direction.

14. Mixer (54a), in particular draft tube mixer, with at least one stirring device according to one of claims 6 to 13 and with the guide tube (38 a), which in a region (56 a) of the connection with the

Sheathing unit (36a; 36b) has an inner cross section (58a) which at least substantially corresponds to an outer cross section (60a) of the sheathing unit (36a; 36b) in the region (56a) of the connection.

15. A process for producing at least one transitional and / or

End product of at least one starting product, with a

Stirring device according to one of claims 1 to 13, wherein the

Starting product by means of the stirring unit (12a, 12b) is stirred.