Stirring element having segmented configuration, for circulating wastewater in basin, and apparatus

Abstract

A device for circulating wastewater is received in a tank, in which a conical or hyperboloid-like stirring body is mounted on a vertical stirring shaft, wherein the stirring body is composed from a plurality of segments produced from metal along radially extending joining zones.

Claims

1. A stirring body for circulating wastewater received in a tank, wherein the stirring body has a conical or hyperboloid shape and a central connector piece for connection to a stirring shaft, the stirring body is formed from a plurality of segments, which is produced from metal and which is assembled along joining zones extending from the stirring shaft to a peripheral edge of the stirring body, and bent sheet metal portions of two adjacent segments form a transport rib in a connected state.

2. The stirring body according to claim 1, wherein the joining zones extend at least in part parallel or in a slanting manner relative to a radial direction.

3. The stirring body according to claim 1, wherein the joining zones are formed from a plurality of straight portions, each of the plurality of straight portions being interconnected to adjacent straight portion via an angled deflection.

4. The stirring body according to claim 3, wherein an angle enclosed by the straight portions adjacent to each other is 130? to 165?.

5. The stirring body according to claim 1, wherein the segments are produced from a sheet metal produced from high-grade steel having a thickness from 0.5 to 15 mm.

6. The stirring body according to claim 1, wherein the segments have a form similar to a segment of a circle in a plan view.

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

8. The stirring body according to claim 1, further comprising shearing ribs mounted on a peripheral edge portion of the segments forming a portion of the peripheral edge.

9. The stirring body according to claim 1, wherein the transport rib extends from an upper side of each segment, facing towards the stirring shaft.

10. The stirring body according to claim 1, wherein a radially inner end of each segment has an angled connector portion provided with an aperture.

11. A device for circulating wastewater received in a tank, wherein the stirring body according to claim 1 is mounted on the stirring shaft extending from a drive arrangement.

12. A stirring body for circulating wastewater received in a tank, wherein the stirring body has a conical or hyperboloid shape and a central connector piece for connection to a stirring shaft, the stirring body is formed from a plurality of segments, which is produced from metal and which is assembled along joining zones extending from the stirring shaft to a peripheral edge of the stirring body, and each segment has bending lines extending in the radial direction.

13. A stirring body for circulating wastewater received in a tank, wherein the stirring body has a conical or hyperboloid shape and a central connector piece for connection to a stirring shaft, the stirring body is formed from a plurality of segments, which is produced from metal and which is assembled along joining zones extending from the stirring shaft to a peripheral edge of the stirring body, and the joining zones are formed by sheet metal portions bent towards an upper side of the segments.

14. A stirring body for circulating wastewater received in a tank, wherein the stirring body has a conical or hyperboloid shape and a central connector piece for connection to a stirring shaft, the stirring body is formed from a plurality of segments, which is produced from metal and which is assembled along joining zones extending from the stirring shaft to a peripheral edge of the stirring body, and shearing ribs and/or transport ribs are formed from a sheet metal produced from high-grade steel and are connected to the respective segments by at least one spot joint.

15. A stirring body for circulating wastewater received in a tank, wherein the stirring body has a conical or hyperboloid shape and a central connector piece for connection to a stirring shaft, the stirring body is formed from a plurality of segments, which is produced from metal and which is assembled along joining zones extending from the stirring shaft to a peripheral edge of the stirring body, and each segment is formed from a plurality of sub-segments, which is assembled along further joining zones extending approximately concentrically relative to the stirring shaft.

16. The stirring body according to claim 15, wherein the segments or the sub-segments are interconnected by rivet or spot-welding joints.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 shows a perspective view of a first stirring body,

(2) FIG. 2 shows a side view according to FIG. 1,

(3) FIG. 3 shows a plan view according to FIG. 1,

(4) FIG. 4 shows a perspective first view of a segment,

(5) FIG. 5 shows a perspective second view of the segment according to FIG. 4, and

(6) FIG. 6 shows an exploded view of the segment according to FIG. 4.

DESCRIPTION OF THE PREFERRED EMBODIMENT

(7) Exemplary embodiments of the invention will be explained in greater details hereinafter on the basis of the drawings. In the figures a stirring body denoted generally by the reference sign 2 is mounted on a free end of a vertical stirring shaft 1 extending from a motor (not shown here). The stirring body 2 has a hyperboloid-like shape. A diameter of the stirring body is at least 120 cm, preferably at least 140 to 150 cm. A connector piece As arranged centrally with respect to a peripheral edge UR is connected to the stirring shaft 1. The shape of the stirring body 2 is provided in particular by making bends along radial bending edges B. A plurality of transport ribs 3 are mounted on an upper side O facing towards the stirring shaft 1. The transport ribs 3 have a plurality of angled deflections A1, A2, A3, in each case about an angle ? from approximately 145? to 155?. Substantially radially extending shearing ribs 4 are mounted on a radially outer peripheral edge portion of the first stirring body 2 on the underside U thereof, which is opposite the upper side O.

(8) The stirring body 2 is assembled from a plurality of structurally identical segments S, S. The segments S, S are interconnected along joining zones F1. A segment S is shown in FIGS. 4 to 6. The segment S has, at its radially inner end, an angled connector portion 5, which is provided with an aperture 6. The segment S formed similarly to a segment of a circle in plan view has, at its radial edges extending in the radial direction or at an incline thereto, webs 7 angled by approximately 90? in the direction of the upper side O, which are produced by bending or folding. The webs 7 serve as joining surfaces for connection of the segment S to an adjacent segment (not shown here). The connection can be made for example by means of riveting or spot welding. The webs 7, 7 of two interconnected segments S form the transport ribs 3.

(9) A fitting flange 8 is mounted on the free end of the stirring shaft 1 and has a multiplicity of further apertures 9 on a virtual circle. Each of the further apertures 9 corresponds to an aperture 6 of the connector portion 5 of a segment S. Consequently, each segment S can be connected to the fitting flange 8 by means of a screw connection. As can be seen in particular from FIG. 4, the connector portions 5 bear against an underside of the fitting flange 8, such that the apertures 6 are aligned with the further apertures 9. On an opposite, upper side of the fitting flange 8, connector ribs 10 are provided, which are connected via connector pieces 11 to the web 7 of the connector piece 5. Reference sign 12 denotes a perforated ring disc, which is formed correspondingly to the fitting flange 8. The connector portions 5, for fastening to the fitting flange 8, can be fastened in a force-fit manner by means of bolts between the fitting flange 8 and the ring disc 12.

(10) FIG. 6 shows an exploded view of a segment S. The segment S is formed from a plurality of sub-segments T1, T2, T3 and T4. The radial edges of each sub-segment T1, T2, T3, T4 each have a portion of the web 7, 7. Each sub-segment T1, T2, T3 and T4 also has a further joining zone F2 extending approximately concentrically relative to the stirring shaft 1, said further joining zones being formed by connection tabs 13 and corresponding rows of holes 14 on the adjacent sub-segment T1, T2, T3 and T4. Each of the sub-segments T1, T2, T3, T4 is formed similarly to a U-profile. As a result of the connection of the webs 7, 7 of adjacent sub-segments and also the connection along the further joining zone F2, a segment similar to a segment of a circle is formed, having radial edges deflected by the angle ?. The segment S is characterised by outstanding stability and torsional rigidity.

(11) The stirring body 2 is formed from segments S, which are in turn formed from a high-grade steel sheet having a thickness for example from 1.0 to 2.0 mm. The webs 7, 7 are each expediently produced by making bends. They are advantageously interconnected by means of a multiplicity of rivet joints arranged along the direction of extension of the webs 7, 7 (not shown here). The shearing ribs 4 are mounted on the segments S by means of spot welding or further rivet joints. Instead of the rivet joints, screw rivet joints or screwed joints can also be used.

(12) The stirring body is rotationally symmetrical. The symmetry thereof is defined in the present exemplary embodiment by an 8-fold axis of rotation. The axis of rotation corresponds to the number of structurally identical segments. Of course, the stirring body can also be provided in a symmetry with an n-fold axis of rotation, wherein n is advantageously an integer in the range between 6 and 12.

(13) Although in the present exemplary embodiment a stirring body 2 having a hyperboloid-like form is shown, the stirring body can of course also have a different form. For example, it can be conical or can be formed in the shape of a truncated cone. The transport ribs 3 can also extend in a straight line in the radial direction. They can be formed as shown in the explained exemplary embodiment also in the case of the conical or truncated cone-shaped embodiment of the stirring body 2.

LIST OF REFERENCE SIGNS

(14) 1 stirring shaft

(15) 2 stirring body

(16) 3, 3 transport rib

(17) 4 shearing rib

(18) 5 connector portion

(19) 6 aperture

(20) 7, 7 web

(21) 8 fitting flange

(22) 9 further aperture

(23) 10 connector rib

(24) 11 connector piece

(25) 12 ring disc

(26) A1, A2, A3 angled deflection

(27) As connector piece

(28) B radial bending edge

(29) ? angle

(30) O upper side

(31) S, S segment

(32) U underside

(33) UR peripheral edge

(34) F1 joining zone

(35) F2 further joining zone

(36) T1, T2, T3, T4 sub-segment