HORIZONTAL AGITATOR

Abstract

The invention relates to a horizontal agitator for producing a flow in a clarifier, a submersible motor and a propeller drivingly connected thereto forming an assembly unit, wherein a receiving portion for removably attaching the assembly unit is provided and can be supported on the bottom of the clarifier, and wherein a guide for guiding the assembly unit along a substantially vertical movement path between a surfacing position above a maximum nominal sewage level defined for the clarifier and the receiving portion is provided. In order to improve the efficiency of the horizontal agitator and to reduce complexity of manufacture, the guide is formed by at least one first cable extending between the surfacing position and the receiving portion.

Description

The invention relates to a horizontal agitator for producing a flow in a clarifier according to the preamble of Patent Claim 1.

Such a horizontal agitator is known from WO 2008/101633 A1. The known horizontal agitator is received on a slide, which is movable vertically along a pillar-like frame. With the known horizontal agitator it is possible to produce a horizontal flow directed in the direction of the frame with a good level of efficiency. Nevertheless, there is the need to further improve the efficiency of the production of the horizontal flow.

The object of the invention is to overcome the disadvantages according to the prior art. In particular, a horizontal agitator is to be specified that enables the production of a horizontal flow with further improved efficiency.

This object is achieved by the features of Claim 1. Expedient embodiments of the invention will emerge from the features of Claims 1 to 7.

In accordance with the invention it is proposed for the submersible motor to be supported on a bottom of the clarifier via at least two first flow guide elements. Since two first flow guide elements are now used to support the submersible motor, it is possible to dispense with the frame known in accordance with the prior art for supporting the submersible motor.

As a result, the flow resistance caused by the frame is omitted. The proposed horizontal agitator enables a particularly efficient production of a horizontal flow. In addition, it can be produced easily and cost-effectively. The term “axial plane” is understood to mean a plane that contains the substantially horizontally running axis of the propeller.

In accordance with an advantageous embodiment, the first flow guide elements are interconnected via at least one carrier plate receiving the submersible motor. The first flow guide elements each extend from the carrier plate at an angle from 90° to 140°, preferably 100° to 120°. In particular if the flow guide elements extend such that they point away from one another at an angle of more than 90° from the carrier plate, a particularly stable support of the submersible motor can be achieved.

In accordance with a further advantageous embodiment, the first flow guide elements and/or the at least one carrier plate is/are produced from folded sheet metal. In particular, it has proven to be advantageous to form the first flow guide elements and/or the at least one carrier plate in a double-walled manner from folded sheet metal. In the case of a double-walled design, apertures for avoiding air pockets within the double wall are provided in at least one of the walls of the double wall.

In accordance with a further embodiment, the first flow guide elements are interconnected on the bottom side via at least one connection element. The at least one carrier plate, the first flow guide elements extending therefrom and the at least one connection element thus form a tunnel-like structure, which is particularly stable.

In accordance with a further embodiment, a second flow guide element is provided, which extends in a direction pointing away from the bottom of the clarifier from a supporting structure installed on the carrier plate or from the submersible motor. The provision of the second flow guide element contributes to an improved orientation of the horizontal flow.

In accordance with a particularly advantageous embodiment, the carrier plate with the first flow guide element installed thereon forms a mount, on which an assembly unit formed from the submersible motor and the propeller is detachably fastened by means of a coupling device. The assembly unit expediently also comprises the second flow guide element. The detachable fastening of the assembly unit on the mount enables a particularly simple maintenance and/or repair of the assembly unit. The assembly unit can be detached from the mount for example by means of a cable winch and can then be raised into a position above a level of wastewater received in the clarifier.

An exemplary embodiment of the invention will be explained in greater detail hereinafter on the basis of the drawings, in which:

FIG. 1 shows a perspective view of the horizontal agitator,

FIG. 2 shows a sectional view according to FIG. 1,

FIG. 3 shows a front view according to FIG. 1,

FIG. 4 shows a side view according to FIG. 1,

FIG. 5 shows a plan view according to FIG. 1 and

FIG. 6 shows a rear view according to FIG. 1.

With the horizontal agitator shown in the figures, a propeller 1 is connected via a gearing 2 to a submersible motor 3. The submersible motor 3 is operated in such a way that a flow directed from the propeller 1 to the submersible motor 3 is produced.

The propeller 1, together with the submersible motor 3 and any provided gearing 2, forms an assembly unit that is supported on a front carrier plate 4a and a rear carrier plate 4b. First flow guide elements 5 extend from both the front carrier plate 4a and rear carrier plate 4b at an angle from approximately 100° to 120°. The first flow guide elements 5 are formed in a plate-like manner. The planes thereof run approximately parallel to an axis of the propeller 1.

The front carrier plate 4a and the rear carrier plate 4b and the first flow guide elements 5 are advantageously produced from folded sheet metals. To improve the stability, the carrier plates 4a, 4b and/or the flow guide elements 5 are double-walled. Here, the folded sheet metals are expediently connected by means of rivets. A mount A produced in this way has excellent stability.

In the region of the bottom B of the clarifier, the first flow guide elements 5 are expediently connected to a front connection element 6a and a rear connection element 6b. The front connection element 6a and the rear connection element 6b each have a flat incident-flow face and downstream a steeply sloping flow-off face.

The assembly unit denoted by reference sign M has a second flow guide element 7, which extends vertically above the submersible motor 3 and has a curved incident-flow edge.

The assembly unit M is detachably connected to a mount A, which comprises the carrier plates 4a, 4b, the first flow guide elements 5 extending therefrom and the connection elements 6a, 6b. To detachably connect the assembly unit M to the mount A, a first coupling element 8a and a second coupling element 8b are installed on the front carrier plate 4a and on the rear carrier plate 4b. A third coupling element 9a corresponding to the first coupling element 8a and a fourth coupling element 9b corresponding to the second coupling element 8b are installed on the mounting element M.

Reference sign 10 denotes a cable. A guide 11, preferably a slotted guide, by means of which the assembly element M is guided along the cable 10, extends from the second flow guide element 7.

To lift the assembly unit M, a further cable 12 can be fixed at the assembly unit M. By exerting a tensile stress by means of the further cable 12, a coupling between the mount A and the assembly element M caused by the coupling elements 8a, 8b, 9a, 9b can be detached, and the assembly element M can be guided along the cable 10 and lifted from the clarifier.

As can be seen from FIG. 2, one end of the cable 10 can be guided through the rear carrier plate 4b and the front carrier plate 4a and fastened to the assembly unit M in the region of the third coupling element 9a. The other end of the cable 10 can be guided via a pulley (not shown here) fixed above the clarifier and fastened at the fastening point. The cable 10 can thus form a cable winch together with the further cable 12, by means of which the assembly unit M is guided when lowered in the direction of the mount A and can be coupled there by cooperation of the coupling elements 8a, 8b, 9a, 9b.

LIST OF REFERENCE SIGNS

• 1 propeller
• 2 gearing
• 3 submersible motor
• 4 a first carrier plate
• 4 b second carrier plate
• 5 first flow guide element
• 6 a first connection element
• 6 b second connection element
• 7 second flow guide element
• 8 a first coupling element
• 8 b second coupling element
• 9 a third coupling element
• 9 b fourth coupling element
• 10 cable
• 11 guide element
• 12 further cable
• A mount
• B bottom
• M assembly unit

Claims

1. A horizontal agitator for producing a flow in a clarifier, wherein a submersible motor and a propeller drivingly connected thereto form an assembly unit, wherein a receiving portion for removably attaching the assembly unit is provided and can be supported on the bottom of the clarifier,and wherein a guide for guiding the assembly unit along a substantially vertical movement path between a surfacing position above a maximum nominal sewage level defined for the clarifier and the receiving portion is provided,characterised in thatthe guide is formed by at least one first cable extending between the surfacing position and the receiving portion.

2. The horizontal agitator according to claim 1, wherein the first cable is guided about a first return arrangement provided on the receiving portion and a first end of the first cable is attached to the assembly unit.

3. The horizontal agitator according to claim 1, wherein a guide provided on the assembly unit surrounds the first cable.

4. The horizontal agitator according to claim 1, wherein, in order to move the assembly unit along the first cable, a second cable is provided, of which the second end is attached to the assembly unit.

5. The horizontal agitator according to claim 1, wherein the first end of the first cable is attached at a lower attachment point on the assembly unit and the second end of the second cable is attached at least at one upper attachment point on the assembly unit.

6. The horizontal agitator according to claim 1, wherein the upper attachment point is offset in relation to a centre of gravity of the assembly unit, such that the assembly unit suspended at least at one upper attachment point adopts a sloping position, in which an axis of the propeller runs in a manner sloping with respect to the bottom of the clarifier.

7. The horizontal agitator according to claim 1, wherein a third end of the first cable is received on a first winch provided above the maximum nominal sewage level and a fourth end of the second cable is received on a second winch provided above the maximum nominal sewage level.

8. The horizontal agitator according to claim 1, wherein the first and the second cable are combined to form a circulating cable, which is guided above the surfacing position about a second return arrangement, preferably a third winch.

9. The horizontal agitator according to claim 7, wherein the first and the second winch or the second return arrangement is attached to a provided bridge or a frame fitted in the region of the surfacing position.

10. The horizontal agitator according to claim 1, wherein the assembly unit has a first coupling arrangement, and wherein the receiving portion is provided with a second coupling arrangement corresponding to the first coupling arrangement, such that the assembly unit can be releasably coupled to the receiving portion by cooperation of the first and the second coupling arrangement.

11. The horizontal agitator according to claim 1, wherein the first coupling arrangement has a first coupling element, which, during the coupling process, engages with a second coupling element of the second coupling arrangement, said coupling element being provided on the receiving portion.

12. The horizontal agitator according to claim 1, wherein the first coupling arrangement has a third coupling element, which, during the coupling process, engages with a fourth coupling element of the second coupling arrangement, said fourth coupling element being provided on the receiving portion, wherein a clamped or latched connection is produced.