Agitator device

Abstract

An agitator device, in particular a non-close-clearance agitator device, in particular with respect to a vessel wall, in particular for mixing low-viscosity to medium-viscosity media, having at least one agitation shaft and having at least one outer agitation blade which is held on the agitation shaft and which in at least one section is implemented so as to be arm-shaped. The agitator device has an inner agitation blade which conjointly with the outer agitation blade implements at least one van-type conveying unit which is at least configured for conveying a medium in at least one direction parallel with the agitation shaft and in particular in at least one further direction perpendicular to the agitation shaft.

Claims

1. A non-close-clearance agitator device, with respect to a vessel wall, comprising: at least one agitation shaft and having at least one outer agitation blade which is held on the agitation shaft and which in at least one section is implemented so as to be arm-shaped, at least one inner agitation blade which conjointly with the outer agitation blade implements at least one vane-type conveying unit which is at least configured for conveying a medium in at least one direction parallel with the agitation shaft and in at least one further direction perpendicular to the agitation shaft, at least one bar by way of which the outer agitation blade is connected to the agitation shaft, at least one further outer agitation blade which is implemented in a manner analogous to the outer agitation blade, wherein a normal of an inner agitation blade plane in the assembled state is aligned so as to be perpendicular to a rotation axis of the agitator device such that the inner agitation blade causes a radial flow component, and the vane-type conveying unit has at least one passage gap and wherein the outer agitation blade and the further outer agitation blade, when viewed perpendicularly to the agitation shaft and to a direction of main extent of the bar, form an X-shaped contour.

2. The agitator device according to claim 1, wherein the outer agitation blade has at least one further section which is adjacent to the section and in which the outer agitation blade is implemented so as to be wider than in the section.

3. The agitator device according to claim 1, wherein the inner agitation blade conjointly with the further section of the outer agitation blade implements the vane-type conveying unit.

4. The agitator device according to claim 1, wherein the inner agitation blade is situated at least to a large part in an inner agitation blade plane and is in particular implemented so as to be plate-type.

5. The agitator device according to claim 1, wherein the outer agitation blade is situated at least to a large part in an outer agitation blade plane.

6. The agitator device according to claim 1, wherein at least one of the at least one inner agitation blade and the at least one outer agitation blade is movable to one of a plurality of positions, and at least one extent of the passage gap is capable of being set based on a movement of the at least one of the at least one inner agitation blade and the at least one outer agitation blade to one of the plurality of positions.

7. The agitator device according to claim 1, wherein the inner agitation blade has at least one inner agitation blade normal, and the outer agitation blade has at least one outer agitation blade normal, wherein the inner agitation blade normal and the outer agitation blade normal include a minimum normal angle of more than 0° and at most 90°.

8. The agitator device according to claim 7, wherein the minimum normal angle is capable of being set.

9. The agitator device according to claim 1, wherein the inner agitation blade is capable of being fastened to the agitation shaft in various angle positions in relation to the outer agitation blade.

10. The agitator device according to claim 1, comprising at least one bottom agitation blade which, when viewed along the agitation shaft, is arranged below the outer agitation blade and/or the inner agitation blade.

11. The agitator device according to claim 10, wherein the bottom agitation blade is capable of being fastened to the agitation shaft in various angle positions in relation to the outer agitation blade.

12. The agitator device according to claim 1, wherein the outer agitation blade and the further outer agitation blade, at least when viewed perpendicularly to the agitation shaft, conjointly form a closed curved outer contour.

13. The agitator device according to claim 1, wherein the outer agitation blade and the further outer agitation blade, at least when viewed perpendicularly to the agitation shaft, conjointly form an ellipse having a non-elliptic recess.

14. An agitator with at least one agitator device according to claim 1.

15. An Agitation system having at least one container and having at least one agitator according to claim 14 arranged in the container.

16. The agitator device according to claim 1, wherein the inner agitation blade has a trapezoidal inner agitation blade outer contour, wherein a lower side of the inner agitation blade is wider than an upper side, at least when viewed perpendicularly to the agitation shaft.

17. The agitator device according to claim 1, wherein the passage gap is arranged between the outer agitation blade and the inner agitation blade and is at least in part delimited by the latter two such that the passage gap has two mutually opposite, parallel delimitations.

18. The agitator device according to claim 1, comprising at least one further bar by way of which the further outer agitation blade is connected to the agitation shaft, wherein, when viewed along the agitation shaft, the bar and the further bar point in opposite directions, such that the bar and the further bar include an angle of 180°.

19. A non-close-clearance agitator device with respect to a vessel wall comprising: at least one agitation shaft, which in at least one operational state rotates about an agitation axis of the agitator device; and at least one outer agitation blade which is held on the agitation shaft and which in at least one section is implemented so as to be arm-shaped, a first outer agitation blade hub, a further outer agitation blade hub, a first bar and a second bar, wherein the outer agitation blade has an average width, which is a largest average expanse of the outer agitation blade perpendicular to the agitation axis, the outer agitation blade has at least one further section which is adjacent to the section and in which the outer agitation blade is implemented so as to be wider than in the section, the further section has an average width which exceeds an average width of the section by a factor of at least 2, the further section in relation to at least one operational position is arranged in a lower region of the agitator device, and the outer agitation blade in the section is connected to the first outer agitation blade hub by means of the first bar and the outer agitation blade in the further section is connected to the further outer agitation blade hub by means of the second bar.

Description

DRAWINGS

(1) Further advantages are derived from the following description of the drawings. An exemplary embodiment of the invention is illustrated in the drawings. The drawings, the description, and the claims contain numerous features in combination. A person skilled in the art will expediently also consider the features individually and combine said features so as to form meaningful further combinations.

(2) In the drawings:

(3) FIG. 1 shows part of an agitator having an agitator device in a perspective side view;

(4) FIG. 2 shows an outer agitation blade of the agitator device and a further outer agitation blade of the agitator device, in each case connected to the outer agitation blade hubs of the agitator device by means of bars of the agitator device, in a perspective side view;

(5) FIG. 3 shows the outer agitation blade and the further outer agitation blade in a side view transversely to a bar-to-hub connection of the agitator device;

(6) FIG. 4 shows the outer agitation blade and the further outer agitation blade in a side view along the bar-to-hub connection;

(7) FIG. 5 shows an inner agitation blade of the agitator device and a further inner agitation blade of the agitator device fastened to an inner agitation blade hub of the agitator device, in a perspective side view;

(8) FIG. 6 shows a bottom agitation blade of the agitator device and a further bottom agitation blade of the agitator device fastened to a bottom agitation blade hub of the agitator device, in a perspective side view; and

(9) FIG. 7 shows an agitation system having the agitator arranged in a container.

DESCRIPTION OF THE EXEMPLARY EMBODIMENT

(10) Various functional units and/or components are present in multiples in the exemplary embodiment described hereunder. For the sake of simplicity, analogously designed components and/or functional units which are provided with the same reference signs in the drawings are described only once in the description of the drawings hereunder.

(11) FIG. 1 shows part of an agitator 46 having at least one agitator device 10 in a perspective side view. The agitator device 10 is embodied as a non-close-clearance agitator device 10, in particular with respect to a vessel wall. The agitator device 10 is in particular configured for mixing low-viscosity to medium-viscosity media. The agitator device 10 has an agitation shaft 12. The agitation shaft 12 in at least one operational state rotates about an agitation axis 60 of the agitation device 10. The agitation shaft 12 transmits a torque and sets elements arranged on the agitation shaft 12 in a rotating motion. An outer agitation blade 14 and a further outer agitation blade 40 of the agitator device 10 are arranged on the agitation shaft 12. The further outer agitation blade 40 is implemented in a manner analogous to that of the outer agitation blade 14.

(12) An inner agitation blade 16 and a further inner agitation blade 48 of the agitator device 10 are arranged on the agitation shaft 12. The further inner agitation blade 48 is implemented in a manner analogous to that of the inner agitation blade 16.

(13) A bottom agitation blade 38 and a further bottom agitation blade 50 of the agitator device are arranged on the agitation shaft 12. The further bottom agitation blade 50 is implemented in a manner analogous to that of the bottom agitation blade 38.

(14) The outer agitation blade 14, the inner agitation blade 16, and the bottom agitation blade 38 are in each case described hereunder, wherein the description is in each case to apply also to the further outer agitation blade 40, the further inner agitation blade 48, and the further bottom agitation blade 50.

(15) The outer agitation blade 14 has a section 18 implemented so as to be arm-shaped. The outer agitation blade 14 has a further section 22. The further section 22 is adjacent to the section 18. The outer agitation blade 14 is implemented so as to be wider in the further section 22 than in the section 18.

(16) The agitator device 10 has a first outer agitation blade hub 56. The agitator device 10 has a further outer agitation blade hub 58. The agitator device 10 has a first bar 52. The agitator device 10 has a second bar 54. The outer agitation blade 14 in the section 18 is connected to the first outer agitation blade hub 56 by means of the first bar 52 of the agitator device 10 (FIG. 2). The outer agitation blade 14 in the further section 22 is connected to the further outer agitation blade hub 58 by means of the second bar 54. The first outer agitation blade hub 56 and the further outer agitation blade hub 58 are in each case fastened to the agitation shaft 12 by means of a screw connection. Further connections of the first outer agitation blade hub 56 and of the second outer agitation blade hub 58, for example a clamping connection, are also imaginable. Proceeding from the agitation shaft 12, the first bar 52 and the second bar 54, when viewed along the agitation shaft 12, point in opposite directions, such that the first bar 52 and the second bar 54 include an angle of 180°. The first bar 52 and the second bar 54 are in each case aligned perpendicularly to the agitation shaft 12.

(17) The agitator device 10 has an outer agitation blade plane 26. The outer agitation blade 14 is situated completely in the outer agitation blade plane 26 (FIG. 2). The section 18 that is implemented so as to be arm-shaped has a consistent smallest section thickness 104 that is situated in the outer agitation blade plane 26. The section thickness 104 is preferably between 5% of a diameter 102 of the agitator device 10 and less than 50% of the diameter 102, particularly preferably is 15% of the diameter 102. The outer agitation blade 14 and the further outer agitation blade 40, when viewed perpendicularly to the agitation shaft 12 and to a direction of main extent of the bar 52, form an X-shaped contour. A “direction of main extent” of an object is in particular to be understood to be a direction which runs parallel with a longest edge of a smallest geometric cuboid which only just completely encloses the object.

(18) The inner agitation blade 16 has at least one inner agitation blade normal 32 (FIG. 1). The outer agitation blade 14 has at least one outer agitation blade normal 34. The inner agitation blade normal 32 and the outer agitation blade normal 34 include a minimum normal angle 36 of 90°. The normal angle 36 can be more than 0° and at most 90°.

(19) The normal angle 36 is capable of being set. An adaptation of the normal angle 36 can be performed, for example, by means of a rotation of the inner agitation blade 16 about the agitation axis 60. The normal angle 36 depends on an inclination of the outer agitation blade 14 in relation to a plane perpendicular to the agitation axis 60.

(20) The outer agitation blade 14 has an outer agitation blade length 108 (FIG. 3). The outer agitation blade 14 has a pitch angle 62 in relation to a plane aligned perpendicularly to the agitation shaft 12. The pitch angle 62 is preferably 60°. The normal angle 36 can be determined from the correlation normal angle 36=(90°−pitch angle 62). The agitator device 10 has a diameter 102 (FIG. 3). The diameter 102 is linked to the pitch angle 62 by a correlation cos(pitch angle 62)=diameter 102/outer agitation blade length 108. FIG. 5 shows the inner agitation blade 16. The agitator device 10 has an inner agitation blade plane 24. The inner agitation blade 16 is situated completely in the inner agitation blade plane 24. The inner agitation blade 16 is implemented so as to be plate-type. The agitator device 10 has an inner agitation blade hub 66. The inner agitation blade 16 and the further inner agitation blade 48 are arranged on the inner agitation blade hub 66. The inner agitation blade 16 and the further inner agitation blade 48 are in each case arranged on the inner agitation blade hub 66 by means of a welded connection. The inner agitation blade hub 66 is fastened to the agitation shaft 12 by means of a screw connection. Further connections of the inner agitation blade hub 66, for example a clamping connection, are also imaginable. An angular distance between the inner agitation blade 16 and the further inner agitation blade 48 is 180°. In the case of a plurality of inner agitation blades, the individual inner agitation blades are arranged at an equidistant angular distance. The angular distance can be determined according to the correlation 360°/number of inner agitation blades.

(21) The inner agitation blade 16, when viewed along the inner agitation blade normal 32, has a trapezoidal contour 68. The trapezoidal contour 68 has sides 96, 98 which are arranged so as to be mutually perpendicular, wherein one of the sides 96 runs parallel with the agitation shaft 12 and the other side 98 runs perpendicularly to the agitation shaft 12. The trapezoidal contour 68 has a further side 70 which runs parallel with the outer agitation blade plane 26.

(22) The inner agitation blade 16 conjointly with the further section 22 of the outer agitation blade 14 implements a vane-type conveying unit 20 of the agitator device 10. The conveying unit 20 is configured for conveying a medium in a direction parallel with the agitation shaft 12 and in a further direction perpendicular to the agitation shaft 12. On account thereof, a radial flow of the medium, wherein the radial flow is in particular directed perpendicularly to the agitation shaft 12, and an axial flow of the medium, wherein the axial flow is in particular directed parallel with the agitation shaft 12, can be created.

(23) The vane-type conveying unit 20 has a passage gap 28 (FIG. 1). The passage gap 28 is delimited by the 15 further side 70 of the trapezoidal contour 68 of the inner agitation blade 16 and by the outer agitation blade plane 26.

(24) An extent 30 of the passage gap 28 is capable of being set. For example, the inner agitation blade 16 is displaceable along the agitation shaft 12. Moreover, the inner agitation blade 16 can be rotatable about the agitation shaft 12. The inner agitation blade 16 is capable of being fastened to the agitation shaft 12 at various angle positions in relation to the outer agitation blade 14.

(25) The passage gap 28 can either be completely closed or be open to the maximum. The passage gap 28 is of maximum size in the case of the inner agitation blade 16 being set perpendicularly to the direction of main extent of the bar 52.

(26) The bottom agitation blade 38, when viewed along the agitation shaft 12, is arranged below the outer agitation blade 14 and/or the inner agitation blade 16 (FIG. 1).

(27) The agitator device 10 has a bottom agitation blade plane 64. The bottom agitation blade 38 is situated completely in the bottom agitation blade plane 64 (FIG. 6). The bottom agitation blade 38 is implemented so as to be plate-type. The bottom agitation blade 38, when viewed in a direction parallel with a bottom agitation blade normal 74 of the bottom agitation blade 38, has a largest expanse 106 parallel with the agitation shaft 12, said expanse 106 being between 5% of the diameter 102 and less than 50% of the diameter 102, particularly preferably 15% of the diameter 102. The agitator device 10 has a bottom agitation blade hub 72. The bottom agitation blade 38 and the further bottom agitation blade 50 are arranged on the bottom agitation blade hub 72. The bottom agitation blade 38 and the further bottom agitation blade 50 are in each case arranged on the bottom agitation blade hub 72 by means of a welded connection. The bottom agitation blade hub 72 is fastened to the agitation shaft 12 by means of a screw connection. Further connections of the bottom agitation blade hub 72, for example a clamping connection, are also imaginable. An angular distance between the bottom agitation blade 38 and the further bottom agitation blade 50 is 180°. In the case of a plurality of bottom agitation blades, the individual bottom agitation blades are arranged at an equidistant angular distance. The angular distance can be determined according to the correlation 360°/number of bottom agitation blades.

(28) The bottom agitation blade 38, when viewed along the bottom agitation blade normal 74, has a contour 76 which comprises a convex side 78. The agitator 46 is disposable in a container 80. The convex side 78 is adapted to a bottom 82 of the container 80.

(29) The bottom agitation blade 38 is capable of being fastened to the agitation shaft 12 at various angle positions in relation to the outer agitation blade 14. The bottom agitation blade 38 is capable of being fastened at various angle positions in relation to the inner agitation blade 16. The angle positions can be set by means of a rotation of the bottom agitation blade hub 72 about the agitation shaft 12.

(30) The conveying unit 20 and all further conveying units which are formed by further sections and further inner agitation blades, in a rotating movement of the agitator device 10 about the agitation axis 60 in at least one operational state at all times point in an identical rotational direction.

(31) FIG. 4 shows the outer agitation blade 14 and the further outer agitation blade 40 when viewed perpendicularly to the agitation shaft 12. The outer agitation blade 14 and the further outer agitation blade 40 conjointly form a closed curved outer contour 42. The curved outer contour 42 is implemented as an ellipse 84. The outer agitation blade 14 and the further outer agitation blade 40, when viewed perpendicularly to the agitation shaft 12, mutually overlap in an upper and a lower apex region 86, 88 of the ellipse 84. Connection locations of the bars 52, 54 to the outer agitation blade 14 and to the further outer agitation blade 40 are located in regions in which the outer agitation blade 14 and the further outer agitation blade 40 mutually overlap when viewed perpendicularly to the agitation shaft 12. A lower third of the surface 90 enclosed by an ellipse 84 is closed.

(32) The outer agitation blade 14 and the further outer agitation blade 40, when viewed perpendicularly to the agitation shaft 12, conjointly form the ellipse 84 having a non-elliptic recess 44. The recess 44 in upper and lateral regions is delimited by respective arm-shaped sections 18, 92 of the outer agitation blade 14 and of the further outer agitation blade 40. The recess 44 in a lower region of the recess 44 is delimited by respective further sections 22, 94 of the outer agitation blade 14 and of the further outer agitation blade 40.

(33) FIG. 7 shows an agitation system 100 having the agitator 46 arranged in the container 80. The container 80 is configured for receiving a medium to be processed by the agitator 46. The container 80 has a container diameter 110. The container diameter 110 is in particular larger than the diameter 102 of the agitator device 10 by a factor of at least 1.05. The agitator 46 has at least one motor 112. The motor 112 is in particular connected to the agitation shaft 12. The motor 112 is configured for transmitting a torque to the agitator 46 in at least one operational state. The agitator 46 in at least one operational state generates a first flow which is directed perpendicularly to the agitation shaft 12, and a second flow which is directed at least substantially parallel with the agitation shaft 12. The first flow is established substantially by the inner agitation blade 16. The second flow is established substantially by the outer agitation blade 14. The proportion of the first flow in an overall flow is determined by the extent 30 of the passage gap 28.

REFERENCE SIGNS

(34) 10 Agitator device 12 Agitation shaft 14 Outer agitation blade 16 Inner agitation blade 18 Section 20 Conveying unit 22 Section 24 Inner agitation blade plane 26 Outer agitation blade plane 28 Passage gap 30 Extent 32 Inner agitation blade normal 34 Outer agitation blade normal 36 Normal angle 38 Bottom agitation blade 40 Outer agitation blade 42 Outer contour 44 Recess 46 Agitator 48 Inner agitation blade 50 Bottom agitation blade 52 Bar 54 Bar 56 Outer agitation blade hub 58 Outer agitation blade hub 60 Agitation axis 62 Pitch angle 64 Bottom agitation blade plane 66 Inner agitation blade hub 68 Contour 70 Side 72 Bottom agitation blade hub 74 Bottom agitation blade normal 76 Contour 78 Convex side 80 Container 82 Bottom 84 Ellipse 86 Apex region 88 Apex region 90 Surface 92 Section 94 Section 96 Side 98 Side 100 Agitation system 102 Diameter 104 Section thickness 106 Expanse 108 Outer agitation blade length 110 Container diameter 112 Motor