Stirring element device

Abstract

A stirrer device, especially for the mixing of a fluid with at least one other fluid, includes at least one fluid dispersing unit able to turn about an axis of rotation, having at least one exit opening for at least one fluid discharge, and the stirrer device has at least one optimization unit, which in at least one operating state increases at least a differential pressure at the exit opening.

Claims

1. A stirrer device, especially for the mixing of a fluid with at least one other fluid, having at least one fluid dispersing unit able to turn about an axis of rotation, the at least one fluid dispersing unit having at least one exit opening for at least one fluid discharge and comprising at least one disperser, which comprises the at least one exit opening, extends radially outward from a region of the at least one fluid dispersing unit near its centre, is hollow, and defines at least one fluid duct, and the stirrer device comprising at least one optimization unit, which in at least one operating state increases at least a differential pressure at the at least one exit opening, wherein the at least one optimization unit comprises at least one fluid delivery unit, which in the at least one operating state generates an optimized interior fluid flow.

2. The stirrer device according to claim 1, wherein the at least one optimization unit comprises at least one outside pressure optimization unit, which in the operating state reduces at least one outside pressure acting contrary to the at least one fluid discharge.

3. The stirrer device according to claim 1, wherein the at least one fluid dispersing unit has an additional exit opening for at least one additional fluid discharge, which is situated before the at least one exit opening viewed in a direction of rotation of the at least one fluid dispersing unit, wherein the at least one optimization unit in the at least one operating state reduces at least an influencing of the at least one fluid discharge by the at least one additional fluid discharge.

4. The stirrer device according to claim 3, wherein the at least one fluid dispersing unit comprises at least one turbulence unit for influencing the at least one fluid discharge and/or the at least one additional fluid discharge.

5. The stirrer device according to claim 1, wherein the at least one optimization unit in the at least one operating state generates at least one exterior fluid flow which is oriented at least substantially parallel to the axis of rotation of the at least one fluid dispersing unit in at least one flow section.

6. The stirrer device according to claim 5, wherein the at least one optimization unit comprises at least one blade able to turn about the axis of rotation of the at least one fluid dispersing unit for an at least partial generating of the at least one exterior fluid flow.

7. The stirrer device according to claim 6, wherein the at least one blade is associated to the at least one exit opening.

8. The stirrer device according to claim 7, wherein the at least one blade is associated to the at least one exit opening and the at least one blade is situated with an offset from the at least one exit opening, viewed along the axis of rotation.

9. The stirrer device according to claim 6, wherein the at least one optimization unit comprises at least one further shorter blade associated to the at least one exit opening, which is situated at a distance from the at least one blade.

10. The stirrer device according to claim 1, wherein the at least one optimization unit comprises at least one flow guiding element for deflecting the at least one exterior fluid flow in a direction at least substantially perpendicular to the axis of rotation of the at least one fluid dispersing unit.

11. The stirrer device according to claim 1, wherein the at least one optimization unit comprises at least one inner pressure optimization unit, which in the operating state increases at least an inner pressure favouring the at least one fluid discharge.

12. The stirrer device according to claim 1, wherein the at least one fluid delivery unit delivers the fluid in the at least one operating state from at least one area near the axis of rotation of the at least one fluid dispersing unit at least partly radially outward towards the at least one exit opening.

13. The stirrer device according to claim 12, wherein the at least one fluid delivery unit comprises at least one vane which has a curved shape when viewed in a direction parallel to the axis of rotation and which delivers the fluid in the at least one area near the axis of rotation at least substantially parallel to the axis of rotation of the at least one fluid dispersing unit.

14. The stirrer device according to claim 1, wherein the at least one fluid delivery unit is arranged entirely inside the at least one fluid dispersing unit.

15. The stirrer device according to claim 1, wherein surfaces of the at least one fluid delivery unit making contact with the fluid are formed at least substantially smooth and/or free of edges.

16. The stirrer device according to claim 1, wherein the at least one fluid dispersing unit comprises at least one round pipe arranged substantially perpendicular to the axis of rotation, on which the at least one exit opening is arranged.

17. The stirrer device according to claim 1, wherein the at least one fluid dispersing unit viewed in at least one direction perpendicular to the axis of rotation has a shape of an airfoil profile at least for a portion.

18. A stirrer having at least one stirrer device according to claim 1.

19. The stirrer device according to claim 1, wherein the at least one fluid delivery unit is fashioned as a turbine.

20. The stirrer device according to claim 1, wherein the at least one fluid delivery unit is situated at the center of the at least one fluid dispersing unit, when viewed in a direction parallel to the axis of rotation.

21. The stirrer device according to claim 1, wherein the at least one fluid dispersing unit comprises at least two dispersion cells, which are arranged symmetrically in regard to the axis of rotation, on a circumference of the at least one fluid dispersing unit, and on each of which a selected exit opening of the at least one exit openings is arranged.

22. The stirrer device according to claim 21, wherein each dispersion cell of the at least two dispersion cells of the at least one fluid dispersing unit, has a leading edge facing toward a direction of rotation and a profile trailing edge facing away from the direction of rotation, wherein, starting from the leading edge, the selected exit opening of the at least one exit openings extends towards the profile trailing edge and has a semioval cross section.

23. The stirrer device according to claim 1, wherein the at least one disperser is curved in shape in a plane of rotation of the at least one fluid dispersing unit.

Description

DRAWINGS

(1) Further benefits will emerge from the following description of the figures. The figures represent exemplary embodiments of the invention. The drawings, the description, and the claims contain numerous features in combination. The skilled person will advisedly also view the features individually and combine them to form further meaningful combinations.

(2) There are shown:

(3) FIG. 1 part of a stirrer with a stirrer device in a perspective side view,

(4) FIG. 2 a perspective schematic representation of a fluid dispersing unit of the stirrer device and an optimization unit of the stirrer device with a fluid delivery unit,

(5) FIG. 3 an enlarged schematic representation of the fluid delivery unit arranged in a receiving space of the fluid dispersing unit,

(6) FIG. 4 a perspective schematic representation of a fluid dispersing unit of an alternative stirrer device and an optimization unit of the alternative stirrer device with a fluid delivery unit,

(7) FIG. 5 a perspective schematic representation of a fluid dispersing unit of a further alternative stirrer device and an optimization unit of the further alternative stirrer device with a fluid delivery unit,

(8) FIG. 6 a further exemplary embodiment of a fluid dispersing unit of a stirrer device in a perspective schematic representation,

(9) FIG. 7 a further exemplary embodiment of a fluid dispersing unit of a stirrer device in a perspective schematic representation, and

(10) FIG. 8 a further perspective schematic representation of the fluid dispersing unit of the exemplary embodiment of FIG. 7.

DESCRIPTION OF EXEMPLARY EMBODIMENTS

(11) In the following described exemplary embodiments, different structural units and/or components are present more than one time. Similarly designed structural units and/or components which are given the same reference numbers in the drawings are described only once, in order to simplify the following description of the figures.

(12) FIG. 1 shows part of a stirrer 34a. The stirrer 34a comprises a stirrer device 10a. The stirrer device 10a is adapted for the mixing of a fluid with another fluid. The stirrer device 10a is adapted for the dispersing of the fluid with the other fluid. The fluid is present as a gaseous phase. The other fluid is present in an initial state as a liquid phase. In the operating state, the other fluid is present as a gas/liquid mixed phase.

(13) The stirrer device 10a comprises a stirring shaft 38a. The stirring shaft 38a rotates in at least one operating state about an axis of rotation 12a of the stirrer device 10a. The stirring shaft 38a transmits a torque and places elements arranged on the stirring shaft 38a in a rotary movement. The stirring shaft 38a can be placed in rotation by an electric motor 46a of the stirrer 34a.

(14) The stirring shaft 38a is configured as a hollow shaft. The axis of rotation 12a runs inside the stirring shaft 38a. The stirring shaft 38a is oriented parallel to the vertical. The stirring shaft 38a has multiple inlet openings 44a. The inlet openings 44a are adapted to suck in the fluid in the operating state.

(15) The stirrer device 10a comprises a fluid dispersing unit 14a. The stirring shaft 38a is fluidically connected to the fluid dispersing unit 14a. The fluid dispersing unit 14a is fixed in rotation on the stirring shaft 38a. The fluid dispersing unit 14a is arranged on the stirring shaft 38a by means of a force locking and/or form fitting connection. The connection is a screw connection. The fluid dispersing unit 14a can turn about the axis of rotation 12a. The stirring shaft 38a and the fluid dispersing unit 14a have the same angular velocity in the operating state. In the operating state, the fluid dispersing unit 14a is entirely submerged in the other fluid.

(16) The fluid dispersing unit 14a comprises an exit opening 16a. The exit opening 16a has a rectangular shape when viewed in a direction perpendicular to a principal plane of extension 68a of the exit opening 16a. Alternatively, the exit opening 16a could have an oval or round shape when viewed in a direction perpendicular to the principal plane of extension 68a of the exit opening 16a.

(17) The fluid dispersing unit 14a comprises an additional exit opening 22a. The additional exit opening 22a is arranged in front of the exit opening 16a, viewed in the direction of rotation 36a of the fluid dispersing unit 14a.

(18) The fluid dispersing unit 14a comprises four exit openings 16a, 22a. The exit openings 16a, 22a are provided respectively for a fluid discharge. The fluid dispersing unit 14a comprises four dispersers 40a. Each of the four dispersers 40a respectively defines one of the exit openings 16a, 22a. The dispersers 40a are each designed as a stirring blade.

(19) In the operating state, the exit openings 16a, 22a are oriented in a direction opposite the direction of rotation 36a for a turning of the fluid dispersing unit 14a in the direction of rotation 36a.

(20) The exit openings 16a, 22a have the same angle spacing from each other in the circumferential direction of the fluid dispersing unit 14a.

(21) In the following, only one of the four dispersers 40a and only one of the four exit openings 16a, 22a shall be described, the description being applicable to all the dispersers 40a and all the exit openings 16a.

(22) The disperser 40a is curved in a plane of rotation of the fluid dispersing unit 14a. The disperser 40a extends radially outward from a region of the fluid dispersing unit 14a near the centre. The disperser 40a is hollow in configuration. The disperser 40a stands in fluidic communication with the stirring shaft 38a. The disperser 40a defines a fluid duct 42a with the exit opening 16a.

(23) In a section plane 70a, an outer boundary 72a of the disperser 40a has a rectangular shape at least substantially transversely to a direction of an interior fluid flow 54a through the fluid duct 42a. Alternatively, the outer boundary 72a of the disperser 40a could have an oval or round shape in a section plane 70a at least substantially transversely to a direction of the interior fluid flow 54a through the fluid duct 42a.

(24) The shape of the exit opening 16a when viewed in a direction perpendicular to the principal plane of extension 68a of the exit opening 16a and the shape of the outer boundary 72a of the disperser 40a in the section plane 70a at least substantially transversely to a direction of the interior fluid flow 54a through the fluid duct 42a are substantially the same. It is conceivable that the shape of the exit opening 16a when viewed in a direction perpendicular to the principal plane of extension 68a of the exit opening 16a and the shape of the outer boundary 72a of the disperser 40a in the section plane 70a at least substantially transversely to a direction of the interior fluid flow 54a through the fluid duct 42a are different.

(25) The section plane 70a and the principal plane of extension 68a of the exit opening 16a are at least substantially congruent at the exit opening 16a. The stirrer device 10a comprises an optimization unit 18a. The fluid dispersing unit 14a and the optimization unit 18a are formed in part as a single piece. The optimization unit 18a increases a differential pressure at the exit opening 16a, 22a in the operating state.

(26) The optimization unit 18a comprises a contour unit 66a. The contour unit 66a is arranged on the stirring shaft 38a. The contour unit 66a is adapted to favour an entry of the fluid in the inlet openings 44a. The contour unit 66a comprises a contour element 62a. The contour unit 66a comprises multiple contour elements 62a.

(27) The contour element 62a is designed as a baffle 64a. The contour element 62a has a curved configuration. The contour element 62a is arranged directly at the inlet opening 44a. Each contour element 62a is associated to precisely one inlet opening 44a. The contour element 62a guides the fluid towards the inlet opening 44a that is associated to the contour element 62a. The contour elements 62a are respectively associated to each inlet opening 44a.

(28) The optimization unit 18a comprises an outside pressure optimization unit 20a. The outside pressure optimization unit 20a in the operating state decreases an outside pressure behind the exit opening 16a, 22a.

(29) The fluid dispersing unit 14a and the outside pressure optimization unit 20a are partly formed as a single piece with each other.

(30) The outside pressure optimization unit 20a comprises an impeller 48a. The impeller 48a comprises a blade 24a. The impeller 48a comprises a further blade 60a. The impeller 48a comprises four blades 24a, 60a. The blades 24a, 60a can turn about the axis of rotation 12a. The blades 24a, 60a have the same angle spacing from each other in the circumferential direction of the impeller 48a. The blades 24a, 60a are adapted to generating an exterior fluid flow 50a. The number of blades 24a, 60a corresponds to the number of exit openings 16a, 22a.

(31) The impeller 48a is arranged beneath the fluid dispersing unit 14a. The blades 24a, 60a are arranged with a downward offset from the exit openings 16a, 22a, viewed along the axis of rotation 12a. Each blade 24a, 60a is associated to precisely one of the exit openings 16a, 22a.

(32) The outside pressure optimization unit 20a generates an exterior fluid flow 50a by means of the blades 24a, 60a in the operating state. The exterior fluid flow 50a in a flow section is oriented parallel to the axis of rotation 12a (see FIG. 1).

(33) The outside pressure optimization unit 20a comprises a flow guiding element 26a. The flow guiding element 26a is arranged above the exit openings 16a, 22a. The flow guiding element 26a is fashioned as a closed disk. The flow guiding element 26a is formed as a single piece with the fluid dispersing unit 14a. The flow guiding element 26a is adapted to deflect the exterior fluid flow 50a in a direction perpendicular to the axis of rotation 12a of the fluid dispersing unit 14a.

(34) The outside pressure optimization unit 20a in the operating state reduces the outside pressure hindering the fluid discharge. The outside pressure optimization unit 20a in the operating state reduces an influencing of the fluid discharge from the exit opening 16a by the other fluid discharge from the other exit opening 22a, which lies in front of the exit opening 16a viewed in the direction of rotation 36a.

(35) The exit opening 16a and the other exit opening 22a together form a dispersion cell 56a. Each exit opening 16a forms its own dispersion cell 56a with an exit opening 16a following directly after it.

(36) The following description will hold for all fluid discharges at all four exit openings 16a, only describing here the fluid discharge at one of the four exit openings 16a. Due to the fluid discharge at the exit opening 16a on the disperser 40a, eddies are formed in the dispersion cell 56a at the disperser 40a directly following the disperser 40a in the direction of rotation 36a of the fluid dispersing unit 14a. The other fluid delivered by the blade 24a washes away the eddies. In this way, the other fluid inside the dispersion cell 56a increases the mean density at the disperser 40a with the other exit opening 22a.

(37) The fluid dispersing unit 14a has a four cell symmetry. The dispersion cells 56a are arranged symmetrically around a circumference of the fluid dispersing unit 14a. Each dispersion cell 56a can be made congruent with the directly following dispersion cell 56a by a 90° turning in the direction of rotation 36a. Each dispersion cell 56a can be made congruent with itself by a 360° turning about the axis of rotation 12a. The fluid dispersing unit 14a may have any desired n-cell symmetry, n being the number of the exit openings 16a, 22a.

(38) The fluid dispersing unit 14a comprises a receiving space 52a (see FIG. 3). The receiving space 52a is shaped as a cylinder. The optimization unit 18a comprises an inner pressure optimization unit 58a. The inner pressure optimization unit 58a in the operating state increases an inner pressure. The inner pressure optimization unit 58a is arranged entirely inside the fluid dispersing unit 14a.

(39) The inner pressure optimization unit 58a comprises a fluid delivery unit 28a. The fluid delivery unit 28a is designed as a turbine. The fluid delivery unit 28a is arranged entirely inside the fluid dispersing unit 14a. The fluid delivery unit 28a is arranged entirely inside the receiving space 52a (see FIG. 1 to FIG. 3).

(40) The fluid delivery unit 28a comprises multiple vanes 32a. The number of exit openings 16a, 22a corresponds to the number of vanes 32a. The fluid delivery unit 28a comprises four vanes 32a. The vanes 32a each have a curved configuration. The vanes 32a have the same angle spacing from each other in the circumferential direction of the fluid delivery unit 28a.

(41) The receiving space 52a and/or a transitional region of the receiving space 52a is fashioned smooth and/or free of edges toward the fluid duct 42a. Surfaces of the fluid delivery unit 28a coming into contact with the fluid are formed smooth and/or free of edges.

(42) In the operating state, the electric motor 46a places the stirring shaft 38a in rotation about the axis of rotation 12a. The fluid dispersing unit 14a, rotationally fixed to the stirring shaft 38a, rotates in the operating state about the axis of rotation 12a.

(43) In the operating state, a negative pressure is created at the exit openings 16a, 22a. In the operating state, the fluid flows through the inlet openings 44a into the stirring shaft 38a. The stirring shaft 38a is fluidically connected to the receiving space 52a. The interior fluid flow 54a is produced by a differential pressure between the inlet openings 44a and the exit openings 16a, 22a. The interior fluid flow 54a extends from the inlet openings 44a at first through the stirring shaft 38a and then through the fluid dispersing unit 14a to the exit openings 16a, 22a.

(44) In the operating state the fluid arrives at the receiving space 52a. The vanes 32a of the fluid delivery unit 28a deliver the fluid to the area near the axis of rotation 30a, parallel to the axis of rotation 12a. The fluid delivery unit 28a delivers the fluid radially outward from an area near the axis of rotation 30a of the fluid dispersing unit 14a towards the exit opening 16a.

(45) The fluid delivery unit 28a generates the optimized interior fluid flow 54a in the operating state. The fluid delivery unit 28a generates the eddy-free interior fluid flow 54a in the operating state. The fluid delivery unit 28a reduces a pressure loss in the operating state.

(46) It is conceivable for the stirrer device 10a to mix and/or disperse three different fluids with each other. The inlet openings 44a in this case are in a fluid with the lowest density, the outside pressure optimization unit 20a in a second fluid with the highest density, and the fluid dispersing unit 14a in a third fluid with a medium density whose value lies between the value for the lowest density and the value for the highest density. Furthermore, at least one solid phase, such as a catalyst, can be added to at least one of the three fluids.

(47) FIG. 4 shows an alternative exemplary embodiment of a stirrer device 10b. In order to avoid needless repetition, the same reference numbers are therefore used for the same assemblies and reference is made to the remarks of FIGS. 1 to 3. In the following, only the details by which the exemplary embodiment of FIGS. 1 to 3 differs from the alternative exemplary embodiment of FIG. 4 shall be discussed. In order to distinguish the exemplary embodiments, the letter b has been added to the references of the alternative exemplary embodiment in FIG. 4.

(48) FIG. 4 shows a perspective schematic representation of a fluid dispersing unit 14b of an alternative stirrer device 10b and an optimization unit 18b of the alternative stirrer device 10b with a fluid delivery unit 28b.

(49) The fluid dispersing unit 14b comprises an exit opening 16b. The exit opening 16b has a semicircular shape, viewed in a direction perpendicular to a principal plane of extension 68b of the exit opening 16b. Alternatively, the exit opening 16b could have an oval or round shape viewed in a direction perpendicular to the principal plane of extension 68b of the exit opening 16b.

(50) The fluid dispersing unit 14b comprises a further exit opening 22b. The further exit opening 22b is situated in front of the exit opening 16b, viewed in the direction of rotation 36b of the fluid dispersing unit 14b.

(51) The fluid dispersing unit 14b comprises four exit openings 16b, 22b. The exit openings 16b, 22b are adapted respectively for a fluid discharge. The fluid dispersing unit 14b comprises four dispersers 40b. Each of the four dispersers 40b respectively defines one of the exit openings 16b, 22b. The dispersers 40b are each designed as a stirring blade.

(52) In the operating state, the exit openings 16b, 22b are oriented in a direction opposite the direction of rotation 36b upon rotation of the fluid dispersing unit 14b in the direction of rotation 36b.

(53) The exit openings 16b, 22b have the same angle spacing from each other in the circumferential direction of the fluid dispersing unit 14b.

(54) In the following, only one of the four dispersers 40b and only one of the four exit openings 16b, 22b shall be described, the description being applicable to all the dispersers 40b and all the exit openings 16b.

(55) The disperser 40b is curved in a plane of rotation of the fluid dispersing unit 14b. The disperser 40b extends radially outward from a region of the fluid dispersing unit 14b near the centre. The disperser 40b is hollow in configuration. The disperser 40b stands in fluidic communication with a stirring shaft 38b. The disperser 40b defines a fluid duct 42b with the exit opening 16b.

(56) In a section plane 70b, an outer boundary 72b of the disperser 40b has a semicircular shape at least substantially transversely to a direction of an interior fluid flow 54b through the fluid duct 42b.

(57) The shape of the exit opening 16b when viewed in a direction perpendicular to the principal plane of extension 68b of the exit opening 16b and the shape of the outer boundary 72b of the disperser 40b in the section plane 70b at least substantially transversely to a direction of the interior fluid flow 54b through the fluid duct 42b are substantially the same. It is conceivable that the shape of the exit opening 16b when viewed in a direction perpendicular to the principal plane of extension 68b of the exit opening 16b and the shape of the outer boundary 72b of the disperser 40b in the section plane 70b at least substantially transversely to a direction of the interior fluid flow 54b through the fluid duct 42b are different.

(58) The section plane 70b is oriented at least substantially parallel to the principal plane of extension 68b of the exit opening 16b.

(59) FIG. 5 shows a perspective schematic representation of a fluid dispersing unit 14c of an alternative stirrer device 10c and an optimization unit 18c of the alternative stirrer device 10c with a fluid delivery unit 28c.

(60) In order to avoid needless repetition, the same reference numbers are therefore used for the same assemblies and reference is made to the remarks of FIGS. 1 to 4. In the following, only the details by which the exemplary embodiment of FIGS. 1 to 4 differs from the further alternative exemplary embodiment of FIG. 5 shall be discussed. In order to distinguish the exemplary embodiments, the letter c has been added to the references of the further alternative exemplary embodiment in FIG. 5.

(61) The fluid dispersing unit 14c comprises a turbulence unit 74c. The turbulence unit 74c is shaped as a spiral. The turbulence unit 74c comprises a spiral 76c. It is conceivable for the turbulence unit 74c to have multiple spirals 76c, being coiled in particular in at least one operating state. It is conceivable for multiple spirals 76c to be arranged one beneath the other. It is furthermore conceivable for the spiral 76c to be arranged at least partly on a rod of the fluid dispersing unit 14c.

(62) The turbulence unit 74c is situated in an outer region of the stirrer device 10c viewed along an axis of rotation 12c of the fluid dispersing unit 14c. The turbulence unit 74c is arranged between dispersers 40c.

(63) The turbulence unit 74c is adapted to favour a passage of the fluid into the other fluid. After the fluid emerges from an exit opening 16c, the fluid flows at least partly around the turbulence unit 74c. The turbulence unit 74c generates turbulences and/or shear forces in a near region of the turbulence unit 74c. The turbulences and/or shear forces distribute the fluid.

(64) In the event that the fluid is present as a gaseous phase, the turbulence unit 74c reduces the diameter of primary gas bubbles emerging from the exit opening 16c and/or from an additional exit opening 22c. The turbulence unit 74c breaks up the primary gas bubbles emerging from the exit opening 16c and/or from the additional exit opening 22c into many smaller gas bubbles.

(65) FIG. 6 shows a perspective schematic representation of a fluid dispersing unit 14d of a stirrer device 10d and an optimization unit 18d of the stirrer device 10d with a fluid delivery unit 28d.

(66) In order to avoid needless repetition, the same reference numbers are therefore used for the same assemblies and reference is made to the remarks of FIGS. 1 to 5. In the following, only the details by which the exemplary embodiments of FIGS. 1 to 5 differ from the further alternative exemplary embodiment of FIG. 6 shall be discussed. In order to distinguish the exemplary embodiments, the letter d has been added to the references of the exemplary embodiment in FIG. 6.

(67) By contrast with the exemplary embodiments of FIGS. 1 to 5, the fluid dispersing unit 14d has a symmetry. The fluid dispersing unit 14d comprises six round pipes 78d, which are arranged symmetrically on a circumference of the fluid dispersing unit 14d. Each of the round pipes 78d forms a dispersion cell 56d. Each of the round pipes 78d can be made congruent with the directly following round pipe 78d by a 60° rotation in the direction of rotation 36d. Each of the round pipes 78d can be made congruent with itself by a 360° rotation about the axis of rotation 12d. A fluid exit opening 16d, 22d is arranged at each of the round pipes 78d.

(68) FIGS. 7 and 8 show a fluid dispersing unit 14e of a stirrer device 10e and an optimization unit 18e of the stirrer device 10e with a fluid delivery unit 28e in two schematic perspective views.

(69) In order to avoid needless repetition, the same reference numbers are therefore used for the same assemblies and reference is made to the remarks of FIGS. 1 to 6. In the following, only the details by which the exemplary embodiments of FIGS. 1 to 6 differ from the exemplary embodiment of FIGS. 7 and 8 shall be discussed. In order to distinguish the exemplary embodiments, the letter e has been added to the references of the exemplary embodiment of FIGS. 7 and 8.

(70) The fluid dispersing unit 14e has a symmetry. The fluid dispersing unit 14e comprises six dispersion cells 56e, which are arranged symmetrically on a circumference of the fluid dispersing unit 14e. Each dispersion cell can be made congruent with the directly following dispersion cell 56e by a 60° rotation in the direction of rotation 36e. Each dispersion cell 56e can be made congruent with itself by a 360° rotation about an axis of rotation 12e of the fluid dispersing unit 14e. An exit opening 16e, 22e is arranged at each of the dispersion cells 56e.

(71) Viewed in a direction perpendicular to the axis of rotation 12e, the fluid dispersing unit 14e has the shape of an airfoil profile 80e at least for a section. Viewed at the dispersion cell 56e of the fluid dispersing unit 14e, the fluid dispersing unit 14 has a leading edge 82e facing toward the direction of rotation 36e and a profile trailing edge 84e facing away from the direction of rotation 36e. The leading edge 82e and the profile trailing edge 84 delimit a region of the fluid dispersing unit 14e with the shape of the airfoil profile 80e. Starting from the leading edge 82e, the exit opening 16e extends towards the profile trailing edge 84e and has a semioval cross section.

(72) FIG. 8 shows a further view of the fluid dispersing unit 14e. The optimization unit 18e comprises a blade 24e. The blade 24e is associated to the exit opening 16e. The blade 24e has a curved shape in the direction of rotation 36e. The optimization unit 18e comprises a further blade 86e. The further blade 86e is associated to the exit opening 16e. The further blade 86e is situated at a distance from the blade 24e.

LIST OF REFERENCES

(73) 10 Stirrer device 12 Axis of rotation 14 Fluid dispersing unit 16 Exit opening 18 Optimization unit 20 Outside pressure optimization unit 22 Additional exit opening 24 Blade 26 Flow guiding element 28 Fluid delivery unit 30 Area near axis of rotation 32 Vane 34 Stirrer 36 Direction of rotation 38 Stirring shaft 40 Disperser 42 Fluid duct 44 Inlet opening 46 Electric motor 48 Impeller 50 Exterior fluid flow 52 Receiving space 54 Interior fluid flow 56 Dispersion cell 58 Inner pressure optimization unit 60 Additional blade 62 Contour element 64 Baffle 66 Contour unit 68 Principal plane of extension 70 Section plane 72 Outer boundary 74 Turbulence unit 76 Spiral 78 Round pipe 80 Airfoil profile 82 Leading edge 84 Profile trailing edge 86 Additional blade