AGITATING MEMBER AND AGITATING DEVICE FOR CREATING A CURRENT IN A WASTEWATER TREATMENT BASIN

Abstract

The invention relates to a stirring body, in particular for generating a current in a wastewater treatment tank, stirring body having a hyperboloid-like or truncated cone-like form and a central connector piece for connection to a stirring shaft. To simplify the production of the stirring body and to reduce the transport outlay, it is proposed in accordance with the invention for the stirring body to be formed from a plurality of segments which are interconnected along joining zones extending from a peripheral edge in the direction of the connector piece.

Claims

1. A stirring body, in particular for generating a current in a wastewater treatment tank, said stirring body having a hyperboloid-like or truncated cone-like form and a central connector piece for connecting to a stirring shaft, characterised in that the stirring body is formed from a plurality of segments, which are interconnected along joining zones extending from a peripheral edge in the direction of the connector piece.

2. The stirring body according to claim 1, wherein the segments each have a first joining portion with a first joining profile and a second joining portion with a second joining profile corresponding to the first joining profile.

3. The stirring body according to claim 1, wherein the first joining profile is formed in the manner of a step.

4. The stirring body according to claim 1, wherein a height of the step corresponds to a thickness of the segment in the region of the second joining portion.

5. The stirring body according to claim 1, wherein an aperture is provided in the segment in the region of the first joining portion.

6. The stirring body according to claim 1, wherein the aperture extends in a radially inner half of the segment along the first joining portion.

7. The stirring body according to claim 1, wherein a portion of the second joining portion located opposite the aperture in the peripheral direction has a recess at the edge.

8. The stirring body according to claim 1, wherein a plurality, preferably all, of the segments each have a transport rib extending from the peripheral edge portion of said segment to the connector piece portion of said segment.

9. The stirring body according to claim 1, wherein a height of the transport rib increases from the peripheral edge portion to the aperture and then decreases again in the direction of the connector piece portion.

10. The stirring body according to claim 1, wherein the transport rib extends from the first joining portion.

11. The stirring body according to claim 1, wherein the transport rib delimits the aperture in part.

12. The stirring body according to claim 1, wherein the first and the second joining portion are curved in a radial direction from the peripheral edge in the direction of the connector piece.

13. The stirring body according to claim 1, wherein mating means corresponding to one another are provided on the first and on the second joining portion.

14. The stirring body according to claim 1, wherein fastening means corresponding to one another are provided on the first and on the second joining portion.

15. The stirring body according to claim 1, wherein the connector piece has further apertures for guiding through fastening means for fastening to a stirring shaft.

16. The stirring body according to claim 1, wherein the segments are produced from a cast plastic or from metal.

17. The stirring body according to claim 1, wherein the plastic is selected from the following group: polyolefins, in particular PP, PS, PA, POM, EVAC, GFK, NCF, SAN, UP, VPE, Tellene, ABS, HDPE.

18. The stirring body according to claim 1, wherein a connection element for connection to the stirring shaft is mounted on the connector piece.

19. The stirring body according to claim 1, wherein the segments are screwed and/or adhesively bonded to one another.

20. The stirring body according to claim 1, wherein the segments are structurally identical.

21. A stirring device for generating a current in a wastewater treatment tank, in which a stirring body according to claim 1 is mounted on a stirring shaft extending from a drive arrangement.

22. The stirring device according to claim 21, wherein the stirring shaft has axially extending ribs, which engage with corresponding grooves on the connector piece.

Description

[0023] Exemplary embodiments of the invention will be explained in greater detail hereinafter on the basis of the drawings, in which:

[0024] FIG. 1 shows a perspective view of a stirring body,

[0025] FIG. 2 shows a plan view of the stirring body according to FIG. 1,

[0026] FIG. 3 shows a sectional view according to the section line A-A in FIG. 2,

[0027] FIG. 4 shows a perspective view from below of the stirring body according to FIG. 1,

[0028] FIG. 5 shows a perspective view of a segment,

[0029] FIG. 6 shows a perspective view from below of the segment according to FIG. 5,

[0030] FIG. 7 shows a perspective partial view of a connector piece, and

[0031] FIG. 8 shows a sectional view through the connector piece shown in part in FIG. 7.

[0032] In the figures, reference sign 1 in general denotes a stirring body, which has an upper side O, a peripheral edge UR, and an underside U. A connector piece for attachment of a stirring shaft is denoted in general by reference sign 2.

[0033] The stirring body 1 in the present exemplary embodiment has a hyperboloid-like form. It is formed in the present exemplary embodiment from eight segments S1 to S8, which are interconnected along joining zones F1 to F8 extending from the peripheral edge UR in the direction of the connector piece 2.

[0034] The first joining zone F1 is shown in greater detail in FIGS. 2 and 3. Each of the advantageously structurally identical segments S1 to S8 has, on one of its long edges, a first joining portion Fa1 with a first joining profile P1 and, on its other long edge, a second joining portion Fa2 with a second joining profile P2 (see also FIGS. 5 and 6). In the present exemplary embodiment the first joining profile P1 is formed in the manner of a step, from which a transport rib T1 extends at an angle in the range from 60 to 90. The second joining profile P2, which is provided on the second long edge, opposite the first long edge in the peripheral direction, corresponds in the present exemplary embodiment in cross section to a plate (see FIG. 3). The second joining profile P2 corresponds with the first joining profile P1 in such a way that, in the assembled state, the contours of all undersides of the segments S1 to S8 complement one another to form a flat overall contour forming the underside U of the stirring body 1. For this purpose, the second joining profile P2 has a thickness D which corresponds to a height of the step of the first joining profile P1.

[0035] FIGS. 5 and 6 show, by way of example, perspective views of the first segment S1. The first segment S1 has a first aperture D1, which extends in a radially inner half of the first segment S1 along the first joining portion Fa1. The first transport rib T1 delimits the first aperture D1 in part. A portion of the second joining portion Fa2 opposite the first aperture D1 in the peripheral direction has a recess A at the edge. The recess A at the edge is formed such that an eighth web St8 (see FIG. 4) extending from an eighth transport rib T8 of the eighth segment S8 is received in said recess in an interlocking manner in the assembled state.

[0036] The first transport rib T1 has a minimum height H1 in the region of the peripheral edge portion URs and has a maximum height H2 in the region of the first aperture D1 (see FIG. 5). A ratio H1/H2 lies in the range 1/5 to 1/100, preferably in the range from 1/5 to 1/20.

[0037] As can be seen in particular from FIG. 1 to 3, the angle between the first transport rib T1 and the upper side O decreases from the peripheral edge UR to the connector piece 2, such that the first transport rib T1 is inclined relative to the first aperture D1, in particular in the region of the first aperture D1. The maximum height H2 decreases again from the first aperture D1 in the direction of a connector piece portion 2.

[0038] As is clear in particular from FIG. 5, the joining portions Fa1, Fa2 are curved. The joining portions Fa1, Fa2 and the first transport rib T1 extending from the first joining portion Fa1 extend approximately radially in a radially inner portion of the stirring body 1 and then bend in a tangential direction, such that, in the region of a peripheral edge portion URs, they extend in a slanting manner relative to said peripheral edge portion.

[0039] The first aperture D1 is delimited, as considered from the upper side O, by the convexly curved side of the first transport rib T1. The same is true for the arrangement of the further apertures D2 to D8 with respect to the corresponding further transport ribs T2 to T8.

[0040] As is shown in particular in FIG. 6, the connector piece portion 2 formed substantially in the manner of a portion of a cylinder jacket has a step-like offset V corresponding to the step-like design of the first joining profile P1. In other words, the first joining profile P1 extends into the connector piece portion 2, apart from the interruption formed by the first aperture D1.

[0041] FIGS. 7 and 8 show an embodiment of the connector piece 2 in combination with a stirring shaft 3. The stirring shaft 3 here has axially extending ribs 4. The connector piece portions 2 of the segments are formed here such that grooves 5 formed in a manner corresponding to the ribs 4 are provided in said connector piece portions, such that the ribs 4 engage in an interlocking manner with the grooves 5. A connection between the stirring body 1 and the stirring shaft 3 in particular such that conjoint rotation therebetween is provided can thus be produced.

[0042] Although the stirring body 1 has a hyperboloid-like form in the figures, it may also be that the stirring body 1 is formed for example in the manner of a truncated cone.

[0043] The segments S1 to S8 shown in the figures are expediently structurally identical. They can be produced easily from plastic by means of casting. In particular, the following plastics are suitable for production of the segments S1 to S8: polyolefins, in particular PP, PS, ABS, PA, POM, EVAC, GFK, NCF, SAN, UP, VPE, Tellene, HDPE and the like.

[0044] The presently described stirring body 1 is constructed from eight structurally identical segments S1 to S8. It is of course also possible to produce a similar stirring body 1 from a smaller or larger number of structurally identical segments.

[0045] In the shown exemplary embodiment each of the segments S1 to S8 has a transport rib T1 to T8, each of said transport ribs being arranged along one long edge. Of course, it is also possible to provide the transport ribs T1 to T8 for example centrally in the segment S1. It is also conceivable to combine segments S1 to S8 without transport ribs T1 to T8 with segments S1 to S8 that have transport ribs T1 to T8.

[0046] The segments S1 to S8 shown in the present exemplary embodiment each have an aperture D1 to D8. Of course, it is also possible to omit the apertures D1 to D8 or to combine segments S1 to S8 having apertures D1 to D8 with further segments S1 to S8 that have no apertures D1 to D8.

[0047] The segments S1 to S8 can be interconnected preferably by means of screw connections not shown here in greater detail. By way of example, threaded bushings can be provided for this purpose in the region of the second joining profile P2. It is also possible to adhesively bond the segments S1 to S8 to one another in addition to the aforementioned screwed connections. In order to facilitate the assembly of the stirring body 1, a template can be provided for example, onto which the segments S1 to S8 are placed and interconnected in succession.

[0048] The proposed stirring body 1 can be produced and transported with reduced outlay. It nevertheless has outstanding strength.

LIST OF REFERENCE SIGNS

[0049] 1 stirring body [0050] 2 connector piece [0051] 2 connector piece portion [0052] 3 stirring shaft [0053] 4 rib [0054] 5 groove [0055] A recess [0056] D thickness [0057] D1 to D8 aperture [0058] F1 to F8 joining zone [0059] Fa1 first joining portion [0060] Fa2 second joining portion [0061] H1 minimum height [0062] H2 maximum height [0063] O upper side [0064] P1 first joining profile [0065] P2 second joining profile [0066] S1 to S8 segment [0067] St1 first web [0068] T1 to T8 transport rib [0069] U underside [0070] UR peripheral edge [0071] URs peripheral edge portion [0072] V offset [0073] angle