Abstract
A stirring device has at least one at least substantially metallic stirring blade carrier and a plurality of stirring blades, which are connected to the stirring blade carrier, wherein the stirring blades are at least substantially made of a non-metallic material, wherein the non-metallic material is a ceramic material, wherein the stirring blades are releasably connected to the stirring blade carrier, wherein it is possible to release and/or establish a mechanical, namely a negative-fit and/or positive-fit connection between the stirring blades and the stirring blade carrier in a damage-free and/or non-destructive manner, and wherein the stirring blade carrier comprises at least one recess, which is configured to at least partly accommodate at least one of the stirring blades. The recess comprises at least one partial region implemented in a contiguous fashion if viewed in parallel to a rotational axis of the stirring blade carrier.
Claims
1. A stirring device comprising: at least one at least substantially metallic stirring blade carrier; and a plurality of stirring blades that are releasably connected to the stirring blade carrier in a negative-fit mechanical connection and/or a positive-fit mechanical connection, the stirring blades are at least substantially made of a ceramic material, wherein the negative-fit mechanical connection and/or the positive-fit mechanical connection is establishable, and releasable, between the plurality of stirring blades and the stirring blade carrier in a damage-free and/or non-destructive manner, and wherein the stirring blade carrier comprises at least one recess per each of the plurality of stirring blades that is configured to accommodate at least one of the stirring blades at least partly, the recess comprises at least one partial region that is contiguous with respect to a view parallel to a rotational axis of the stirring blade carrier.
2. The stirring device according to claim 1, wherein the stirring blade carrier comprises at least one carrier element, which is at least substantially disc-shaped.
3. The stirring device according to claim 2, wherein the stirring blade carrier comprises at least two disc-shaped carrier elements, which mate to each other and are configured to accommodate, in a mounted state, the stirring blades at least partly in a region between the carrier elements.
4. The stirring device according to claim 1, wherein the stirring blades each comprise at least one blade element and at least one fixation protrusion, which is connected to the blade element in a one-part implementation.
5. The stirring device according to claim 4, wherein the fixation protrusion comprises at least one recess, which is configured to accommodate at least one fixation element.
6. The stirring device according to claim 4, wherein the blade element comprises at least one recess which is configured to accommodate at least one fixation element.
7. The stirring device according to claim 4, wherein the stirring blades and the stirring blade carrier are configured to, in a mounted state, force flows from the stirring blades into the stirring blade carrier always in a direction at least substantially perpendicular to a contact surface between the respective stirring blade and the stirring blade carrier and/or in a direction at least substantially perpendicular from the stirring blades into the fixation protrusion.
8. The stirring device according to claim 1, wherein an effective surface of the stirring blades is in the mounted state oriented at least substantially perpendicular to a rotational plane of the stirring blade carrier.
9. A stirring agitator with at least one drive unit, at least one stirring shaft and at least one stirring device according to claim 1, which is drivable via the stirring shaft.
10. A POX autoclave with at least one stirring agitator according to claim 9.
11. The stirring device according to claim 1, wherein the stirring blades each comprise at least one fixation protrusion, which extends perpendicular to an effective surface of the respective stirring blade.
12. The stirring device according to claim 1, wherein the stirring blades each comprise at least one fixation protrusion that is wing-shaped.
13. The stirring device according to claim 3, wherein the stirring blades each comprise at least one fixation protrusion, which is sandwiched between the carrier elements in a mounted state of the stirring blades.
14. The stirring device according to claim 1, wherein the stirring blades comprise a curved outer contour and the partial region of the recess corresponds at least substantially to the outer contour of the stirring blade.
15. The stirring device according to claim 1, wherein the partial region of the recess is skewed with respect to a rotational axis of the stirring blade carrier.
16. The POX autoclave according to claim 10, further comprising at least one container that is configured for accommodating an abrasive medium.
Description
DRAWINGS
(1) Further advantages will become apparent from the following description of the drawings. The drawings show three exemplary embodiments of the invention. 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.
(2) It is shown in:
(3) FIG. 1 a stirring device embodied as a radial stirring agitator, in a perspective view,
(4) FIG. 2 a stirring blade of a stirring device,
(5) FIG. 3 a section of a stirring blade carrier with a mounted stirring blade according to FIG. 2,
(6) FIG. 4 a sectional view of the stirring blade carrier with the mounted stirring blade of FIG. 3,
(7) FIG. 5 an alternative stirring blade of a stirring device,
(8) FIG. 6 a section of a stirring blade carrier with a mounted stirring blade according to FIG. 5,
(9) FIG. 7 an alternative implementation of a stirring device,
(10) FIG. 8 a section of a stirring blade carrier with a mounted stirring blade according to FIG. 7, and
(11) FIG. 9 a POX autoclave with five stirring agitators, each comprising a stirring device according to one of FIGS. 1 to 8.
DESCRIPTION OF THE EXEMPLARY EMBODIMENTS
(12) FIG. 1 exemplarily shows a stirring device 10 embodied as a radial stirring agitator, in a mounted state in a perspective view. The stirring device 10 comprises a metallic stirring blade carrier 12. In the present case the stirring blade carrier 12 is, for example, made of grade 12 titanium. Furthermore the stirring device 10 comprises a plurality of stirring blades 14, which are connected to the stirring blade carrier 12. The stirring blades 14 are made of a non-metallic material. Preferably the stirring blades 14 are made of a ceramic material, advantageously a non-oxide ceramic, e.g. silicon nitride or silicon carbide. The stirring blades 14 are arranged on the stirring blade carrier 12 in a circumferential direction. In the shown embodiment, eight stirring blades 14 are exemplarily depicted wherein, however, any differing number is also conceivable. The stirring device 10 further comprises a stirring element hub 52, which is arranged on the stirring blade carrier 12. The stirring element hub 52 is configured to accommodate, in at least one operation state, a stirring shaft 48. The stirring element hub 52 is configured for mounting the stirring device 10 axially to the stirring shaft 48. An orientation of the stirring shaft 48 defines a rotational axis 20 of the stirring device 10. The stirring blades 14 are, in the mounted state shown, arranged on the stirring blade carrier 12 in such a way that an effective surface 40 of the stirring blades 14 is oriented respectively perpendicularly to a rotational plane 42 of the stirring blade carrier 12.
(13) FIG. 2 shows an embodiment of a stirring blade 14a. The stirring blade 14a comprises a blade element 26a and a fixation protrusion 28a, which is embodied in a one-part implementation with the blade element 26a. FIG. 3 shows a section of the stirring blade carrier 12a with a mounted stirring blade 14a in a plan view. The stirring blade carrier 12a comprises in the section shown a recess 16a, which is configured to partly accommodate the stirring blade 14a. The recess 16a herein comprises a partial region 18a, which, viewed in parallel to the rotational axis 20a of the stirring blade carrier 12a, is implemented in a contiguous fashion. The stirring blade carrier 12a comprises a number of identical recesses 16a which corresponds to a number of stirring blades 14a that are to be mounted. FIG. 4 shows a sectional view along the section line III-III. The stirring blade carrier 12a comprises in the present embodiment two disc-shaped carrier elements 22a, 24a, which correspond to each other and are configured to accommodate, in a mounted state, the fixation protrusion 28a of the stirring blades 14a between the carrier elements 22a, 24a. For this purpose the carrier elements 22a, 24a form a region 56a, which corresponds to the fixation protrusion 28a, in which the fixation protrusion 28a is fixated in negative-fit and positive-fit fashion in a mounted state. While the fixation protrusion 28a is arranged between the disc-shaped carrier elements 22a, 24a, the blade element 26a protrudes over the stirring blade carrier 12a on both sides. In the mounted state the carrier elements 22a, 24a are connected to each other via fixation elements 58a. When the fixation elements 58a are released, the stirring blades 14a are removable from the stirring blade carrier 12a, the stirring blades 14a being thus connected to the stirring blade carrier 14a releasably. This allows, e.g. in case of wear-down, simple replacement of individual or all stirring blades 14a.
(14) The stirring blades 14a and the stirring blade carrier 12a are implemented in such a way that, in a mounted state, force flows 60a always, in particular during stirring operation, go perpendicularly from the stirring blades 14a into the fixation protrusions 28a of the stirring blades 14a. In this way it is achievable that, in particular during a stirring operation, a pressure load is applied onto the stirring blades 14a, while tension loads are avoided at least largely.
(15) FIGS. 5 to 8 show further exemplary embodiments of the invention. The following description and the drawings are substantially restricted to the differences between the exemplary embodiments while regarding identically designated structural components, in particular regarding structural components with the same reference numerals, principally the drawings and/or descriptions of the other exemplary embodiments, in particular of FIGS. 2 to 4, may be referred to. For distinguishing the exemplary embodiments, the letter a is added to the reference numerals of the exemplary embodiment in FIGS. 2 to 4. In the exemplary embodiments of FIGS. 5 to 8 the letter a has been substituted by the letters b and c.
(16) FIG. 5 shows an alternative implementation of a stirring blade 14b. The stirring blade 14b comprises a blade element 26b and a fixation protrusion 28b, which is embodied in a one-part implementation with the blade element 26b. The fixation protrusion 28b comprises recesses 30b, which are configured for accommodating fixation elements 32b. FIG. 6 shows a section of the stirring blade carrier 12b with a mounted stirring blade 14b in a plan view. In the section shown, the stirring blade carrier 12b comprises a recess 16b, which is configured to partly accommodate the stirring blade 14b. The recess 16b herein comprises a partial region 18b which is, viewed in parallel to a rotational axis 20b of the stirring blade carrier 12b, embodied in a contiguous fashion. The stirring blade carrier 12b comprises a number of identical recesses 16b which corresponds to a number of stirring blades 14b that are to be mounted. The stirring blade 14b is releasably connected to the stirring blade carrier 12b via fixation elements 32b, which are guided through the recesses 30b of the fixation protrusion 28b. Herein the fixation protrusion 28b lies upon a surface of a disc-shaped carrier element 22b of the stirring blade carrier 12b, while the blade element 26b protrudes over the stirring blade carrier 12b on both sides. A simple exchange of individual stirring blades 14b, e.g. in case of wear-down, may be effected in a simple fashion by releasing the fixation elements 32b.
(17) The stirring blades 14b and the stirring blade carrier 12b are implemented in such a way that, in a mounted state, force flows 60b always, in particular during a stirring operation, go perpendicularly from the stirring blades 14b into the fixation protrusions 28b of the stirring blades 14b. It is in this way achievable that, in particular during a stirring operation, a pressure load is applied onto the stirring blades 14b while tension loads are avoided at least largely.
(18) FIG. 7 shows an alternative implementation of a stirring device 10c. The stirring device 10c comprises a metallic stirring blade carrier 12c and a plurality of ceramic stirring blades 14c, which are connected to the stirring blade carrier 12c. To clearly show the structure, only six of possible eight stirring blades 14c are depicted here in a mounted state. The stirring blade carrier 12c comprises a disc-shaped carrier element 22c. Furthermore the stirring blade carrier 12c comprises recesses 16c, which are arranged in a circumferential direction and are configured to partly accommodate the stirring blades 14c. FIG. 8 shows a section of the stirring blade carrier 12c with a stirring blade 14c that is mounted in one of the recesses 16c, in a plan view. The recess 16c is implemented triangle-shaped, wherein a side 62c of the recess 16c corresponds to an outer contour of the stirring blade 14c. For the purpose of fixating the stirring blade 14c to the stirring blade carrier 12c, a blade element 26c of the stirring blade 14c comprises recesses 34c for accommodating fixation elements 36c, e.g. screws. In a mounted state the stirring blade 14c is releasably connected to the stirring blade carrier 12c by means of the fixation elements 36c, the stirring blade 14c abutting on a contact surface 38c implemented by the side 62c of the recess 16c that corresponds to the outer contour of the stirring blade 14c.
(19) The stirring blades 14c and the stirring blade carrier 12c are implemented in such a way that in a mounted state force flows 60c from the stirring blades 14c into the stirring blade carrier 12c always, in particular during a stirring operation, go perpendicularly to the contact surface 38c, between the respective stirring blade 14c and the stirring blade carrier 12c. It is thus achievable that a pressure load acts on the stirring blades 14c, in particular during a stirring operation, while tension loads are avoided at least largely.
(20) FIG. 9 shows an example of a POX autoclave 50 with a horizontally arranged container 64 and a plurality of stirring agitators 44 arranged in the container 64. The stirring agitators 44 each comprise a drive unit 46, a stirring shaft 48 and a stirring device 10a, 10b, 10c, which is drivable by means of the stirring shaft 48. The container 64 is in the present case partitioned into four container regions by separating walls 66. The stirring agitators 44 are in the present case embodied identically. The stirring agitators 44 are arranged in the container 64 in such a way that a respective rotational axis 20 is arranged perpendicularly to a horizontally arranged container axis. In the present case the system comprises five stirring agitators 44. In a first container region 70 two stirring agitators 44 of the five stirring agitators 44 are arranged. In the further container regions respectively one further stirring agitator 44 is arranged. In an operating state an abrasive media is located in the container 64. The abrasive media is in the present case implemented as a suspension featuring a huge solid-matter load. Beyond this the POX autoclave 50 comprises, by way of example, two gas lances 68, which are arranged in the first container region 70. The gas lances 68 are configured to convey oxygen to the abrasive media in the first container region 70. Alternatively it is also conceivable to arrange a different number of and/or differently arranged and/or differently implemented stirring elements, which may in particular comprise a stirring device according to the invention, in a container.
