Stirring element device and method for producing a stirring element device

Abstract

A stirring element device, in particular for stirring fluidized beds and/or solid matter mixtures and/or highly viscous suspensions, comprises at least one helical stirrer, which is rotatable around a rotation axis and has at least one winding that runs around the rotation axis, wherein the helical stirrer comprises a base body, which has in at least one cross-sectional view an at least section-wise oval, in particular circle-shaped, outer contour.

Claims

1. A stirring element device, in particular for stirring fluidized beds and/or solid matter mixtures and/or highly viscous suspensions, with at least one helical stirrer, which is rotatable around a rotation axis and has at least one winding that runs around the rotation axis, wherein the helical stirrer comprises a base body, which has in at least one cross-sectional view an at least section-wise oval, in particular circle-shaped, outer contour.

2. The stirring element device according to claim 1, wherein the helical stirrer comprises a stirring blade, which is connected to the base body.

3. The stirring element device according to claim 2, wherein the stirring blade is connected to the base body by substance-to-substance bond.

4. The stirring element device according to claim 2, wherein the helical stirrer comprises at least one connection element, which connects the stirring blade to the base body.

5. The stirring element device according to claim 2, wherein the base body extends along the entire stirring blade, in particular along a principal course.

6. The stirring element device according to claim 2, wherein the stirring blade has an at least substantially planar surface on a side facing away from the base body.

7. The stirring element device according to claim 2, wherein in the cross-sectional view a transverse extent of the stirring blade is greater than a diameter of the outer contour of the base body.

8. The stirring element device according to claim 2, wherein in the cross-sectional view the stirring blade has a thickness that is equivalent to maximally 20% of a diameter of the outer contour of the base body.

9. The stirring element device according to claim 1, further comprising a cover unit with at least one cover element, which extends at least partly along the base body, covering the base body at least partly in at least one direction that is perpendicular to the rotation axis.

10. The stirring element device according to claim 1, wherein the base body is embodied as a tube.

11. An agitation reactor with a stirring container and with a stirring element device according to claim 1.

12. The agitation reactor according to claim 11, wherein the helical stirrer is arranged in the stirring container in such a way that a wall clearance to an inner wall of the stirring container is optimized.

13. A method for producing a stirring element device, in particular according to claim 1, with at least one helical stirrer, wherein a base body of the helical stirrer is produced from a tube with an at least section-wise oval, in particular circle-shaped, outer contour.

14. The method according to claim 13, wherein a stirring blade of the helical stirrer is connected to the base body.

Description

DRAWINGS

[0028] Further advantages will become apparent from the following description of the drawings. In the drawings two exemplary embodiments of the invention are illustrated. The drawings, the description and the claims contain a plurality of features in combination. Someone skilled in the art will purposefully also consider the features individually and will find further expedient combinations.

[0029] It is shown in:

[0030] FIG. 1 an agitator with a stirring element device in a schematic representation,

[0031] FIG. 2 the stirring element device with a helical stirrer, comprising a base body and a stirring blade, in a schematic side view,

[0032] FIG. 3 a schematic partial view of the base body and the stirring blade in a cross-sectional view,

[0033] FIG. 4 the helical stirrer in a schematic perspective view,

[0034] FIG. 5 a schematic diagram of a method for producing the stirring element device, and

[0035] FIG. 6 a further exemplary embodiment of a stirring element device in a schematic cross-sectional view.

DESCRIPTION OF THE EXEMPLARY EMBODIMENTS

[0036] In the figures, of objects present in multiple form in each case only one is given a reference numeral.

[0037] FIG. 1 shows a agitation reactor 40 in a schematic representation. The agitation reactor 40 comprises a stirring container 56. The agitation reactor 40 comprises a stirring element device 10. In FIG. 1 the stirring element device 10 is arranged in the stirring container 56 of the agitation reactor 40. The agitation reactor 40 comprises a drive unit 44. The stirring element device 10 is connected to the drive unit 44 of the agitation reactor 40 via a drive shaft of the agitation reactor 40.

[0038] The stirring element device 10 is configured for stirring fluidized beds and/or solid matter mixtures and/or highly viscous suspensions. The stirring element device 10 comprises a helical stirrer 12. The helical stirrer 12 is rotatable around a rotation axis 14. The helical stirrer 12 has at least one winding 16 running around the rotation axis 14. Starting from the drive shaft 42 of the agitation reactor 40, the winding 16 has a substantially constant gradient along a main extent direction 62 of the helical stirrer 12 and winds around the rotation axis 14 in a complete 360-degree turn. In the present case the helical stirrer 12 has a plurality of windings which follow each other in the main extent direction 62 and run around the rotation axis 14, namely the winding 16, a further winding 58 and a further winding 60. The further windings 58, 60 have a gradient that is substantially identical to the gradient of the winding 16, and in each case wind around the rotation axis 14 in a complete 360-degree turn. The helical stirrer 12 has in its main extent direction 62 the shape of a helix.

[0039] The helical stirrer 12 comprises a base body 18. The base body 18 of the helical stirrer 12 is connected to the drive shaft 42 of the agitation reactor 40 in a connection point 64. The helical stirrer 12 is implemented so as to be self-supporting. In an operating state of the agitation reactor 40, a drive momentum provided by the drive unit 44 is transferred from the drive shaft 42 to the base body 18 of the helical stirrer 12 and makes the helical stirrer 12 execute a rotational movement in a rotational direction 66 around the rotation axis 14.

[0040] The helical stirrer 12 of the stirring element device 10 is arranged in the stirring container 56 of the agitation reactor 40 in such a way that a wall clearance 76 to an inner wall 80 of the stirring container 56 is optimized. In the present case the wall clearance 76 is 75 mm. In the present case the wall clearance 76 of the helical stirrer 12 to the inner wall 80 of the stirring container 56 is optimized in such a way that in an operating state of the agitation reactor 40, on the one hand, complete mixing is enabled over the entire cross section of the stirring container 56 and, on the other hand, a blocking of the helical stirrer 12 by particles of media which are to be stirred (not shown) between the helical stirrer 12 and the inner wall is prevented.

[0041] FIG. 2 shows a schematic side view of the stirring element device 10. The base body 18 of the helical stirrer 12 has in at least one cross-sectional view (cf. FIG. 3) an at least section-wise oval, in particular circle-shaped, outer contour 20. In the present case the outer contour 20 of the base body 18 is circle-shaped. In the present case the base body 18 has a section-wise oval, in particular circle-shaped, outer contour 20 in all cross-sectional views along a principal course 26 of the helical stirrer 12 (cf. FIG. 4).

[0042] The base body 18 is embodied as a tube 36. In the present case the tube 36 is embodied as a bent round tube.

[0043] The helical stirrer 12 comprises a stirring blade 22. The stirring blade 22 is connected to the base body 18.

[0044] The helical stirrer 12 comprises at least one connection element 24, which connects the stirring blade 22 to the base body 18. In the present case the helical stirrer 12 comprises a plurality of connection elements 24, namely the connection element 24 and a plurality of further connection elements 68. The connection element 24 and the further connection elements 68 are implemented substantially identically to one another, and are arranged spaced apart from one another.

[0045] The stirring blade 22 is connected to the base body 18 by substance-to-substance bond. In the present case the stirring blade 22 is connected to the base body 18 by indirect substance-to-substance bond via the connection element 24 and via the further connection elements 68.

[0046] FIG. 3 shows a schematic partial view of the helical stirrer 12 in a cross-sectional view onto the base body 18, showing a partial region of the base body 18 and of the stirring blade 22, respectively, and showing the connection element 24.

[0047] The connection element 24 has an arc-shaped inner contour 46, which encompasses the outer contour 20 of the base body 18 at least partially. In the present case the connection element 24 is connected, in this case welded, to the outer contour 20 of the base body 18 in the region of its inner contour 46.

[0048] The stirring blade 22 is on its underside 48 connected to the connection element 24 by substance-to-substance bond, in this case welded. The connection element 24 thus connects the stirring blade 22 to the base body 18 by indirect substance-to-substance bond. The stirring blade 22 is moreover connected to the base body 18 in the same way, by indirect substance-to-substance bond, via the further connection elements 68.

[0049] The stirring blade 22 has a transverse extent 30. In the cross-sectional view the transverse extent 30 of the stirring blade 22 is greater than a diameter 32 of the outer contour 20 of the base body 18.

[0050] The stirring blade 22 has a thickness 34 perpendicularly to the transverse extent 30. The thickness 34 of the stirring blade 22 is equivalent to maximally 20% of the diameter 32 of the outer contour 20 of the base body 18. In the present case the stirring blade 22 is implemented of a metal sheet having a small material thickness, which corresponds to the transverse extent 30.

[0051] FIG. 4 shows the helical stirrer 12 of the stirring element device 10 in a schematic perspective view. The base body 18 extends along the entire stirring blade 22, namely along the principal course 26 of the helical stirrer 12.

[0052] On a side 38 facing away from the base body 18 the stirring blade 22 has a planar surface 28.

[0053] FIG. 5 shows a schematic diagram for an illustration of a method for producing the stirring element device 10. In a first method step 50 the base body 18 of the helical stirrer 12 is produced from a tube 36 which has an at least section-wise oval, in particular circle-shaped, outer contour 20 (cf. FIG. 2). In the method step 50 the base body 18 is shaped from the tube 36 by a suitable shaping process. In a further method step 52 the connection element 24 and the further connection elements 68 are respectively connected to the base body 18, for example by a welding process. In a further method step 54 the stirring blade 22 is formed, preferably of a metal sheet having a thin material thickness, and is then connected to the base body 18 by way of the connection element 24 and the further connection elements 68 being respectively connected to the underside 48 of the stirring blade 22, for example by a welding process.

[0054] In FIG. 6 a further exemplary embodiment of the invention is shown. The following descriptions and the drawings are essentially limited to the differences between the exemplary embodiments, wherein in regard to components having the same denomination, in particular components having the same reference numerals, principally the drawings and/or the description of the other exemplary embodiment, in particular of FIGS. 1 to 5, may be referred to. In order to distinguish between the exemplary embodiments, a prime has been added to the reference numerals of the exemplary embodiment shown in FIG. 6.

[0055] FIG. 6 shows a further exemplary embodiment of a stirring element device 10′. The stirring element device 10′ comprises a helical stirrer 12′. The helical stirrer 12′ is rotatable around a rotation axis (not shown). The helical stirrer 12′ comprises a base body 18′. The base body 18′ has in the cross-sectional view an at least section-wise oval, in particular circle-shaped, outer contour 20′. Differently than the base body 18 in the preceding exemplary embodiment, the base body 18′ is made of a full profile. However, alternatively, in analogy to the preceding exemplary embodiment, the base body 18′ of the stirring element device 10′ could also be made of a tube.

[0056] The helical stirrer 12′ comprises a stirring blade 22′. The stirring blade 22′ is implemented substantially identically to the stirring blade 22 of the stirring element device of the preceding exemplary embodiments, therefore the description of FIGS. 1 to 5 may be referred to in regard to this.

[0057] The helical stirrer 12′ comprises a cover unit 78′. The cover unit 78′ comprises at least one cover element 70′, which extends along the entire base body 18′. In the present case the cover unit 78′ comprises the cover element 70′ and a further cover element 72′. The cover element 70′ is connected to the stirring blade 22′ by substance-to-substance bond, for example welded. The cover element 70′ is arranged at least substantially perpendicularly to a transverse extent 30′ of the stirring blade 22′. The first cover element 70′ is arranged on a side of the helical stirrer 12′ that faces toward a rotation axis (not shown). The further cover element 72′ is connected to the stirring blade 22′ by substance-to-substance bond, for example welded. The further cover element 72′ is arranged at least substantially perpendicularly to the transverse extent 30′ of the stirring blade 22′. The further cover element 72′ extends along the entire stirring blade 22′. The second cover element 72′ is arranged on a side of the helical stirrer 12′ that faces away from a rotation axis (not shown). The further cover element 72′ has in a direction that is perpendicular to the stirring blade 22′ a smaller extent than the cover element 70′.

[0058] In an optional implementation, the cover unit 78′ of the stirring element device 10′ comprises an additional cover element 74′. The additional cover element 74′ may be connected to the cover element 70′ and the further cover element 72′ in each case by substance-to-substance bond, for example by welding. The additional cover element 74′ is configured for a flow optimization. In an operating state of the stirring element device 10′, the additional cover element 74′ is in particular configured to create an optimized gas flow toward the further cover element 72′. In a mounted state of the additional cover element 74′, the base body 18′ is encompassed, perpendicularly to the cross-sectional view, in all directions by the stirring blade 22′, the cover element 70′, the further cover element 72′ and the additional cover element 74′.

[0059] For a description of a method for producing the stirring element device 10′, principally the description of FIG. 5 may be referred to, wherein in the further method step 54 additionally the cover element 70′ and the further cover element 72′ are respectively connected to, for example welded with, the stirring blade 22′. It is optionally further possible that in the further method step 54 moreover the additional cover element 74′ is respectively connected to, for example welded with, the cover element 70′ and the further cover element 72′.

REFERENCE NUMERALS

[0060] 10 stirring element device [0061] 12 helical stirrer [0062] 14 rotation axis [0063] 16 winding [0064] 18 base body [0065] 20 outer contour [0066] 22 stirring blade [0067] 24 connection element [0068] 26 principal course [0069] 28 surface [0070] 30 transverse extent [0071] 32 diameter [0072] 34 thickness [0073] 36 tube [0074] 38 side [0075] 40 agitation reactor [0076] 42 drive shaft [0077] 44 drive unit [0078] 46 inner contour [0079] 48 underside [0080] 50 method step [0081] 52 further method step [0082] 54 further method step [0083] 56 stirring container [0084] 58 further winding [0085] 60 further winding [0086] 62 main extent direction [0087] 64 connection point [0088] 66 rotation direction [0089] 68 further connection element [0090] 70 cover element [0091] 72 further cover element [0092] 74 additional cover element [0093] 76 wall clearance [0094] 78 cover unit [0095] 80 inner wall [0096] 82 direction