DE4439627A1 - Clearance system for rainwater overflow basin - Google Patents

Abstract

The clearance system involves using a cleaning device (21) which has a shaft (23) fitted with a channel (24). A cleaning member (29) is arranged on one flank (27). In the longitudinal direction the channel extends over the total length of the shaft. The channel is essentially V-shaped with flanks (27,28) and has a channel base (31) with a drop below an angle ( alpha ). The channel is so broad as to lead floating material into it.

Description

The invention relates to a relief device for mixed water sewage, in particular especially for rainwater treatment according to the preamble of claim 1.

Such relief devices of mixed water sewerage, such as Rain overflow basin, overflows without basin, continuous basin or the like, ha ben the task of collecting a first burst of dirt from rainwater, so that this cannot get into a body of water or river courses. This is in the course of increasing renaturation of the waters required. With such relief construction plants it is known that the floating materials, such as faeces, diapers, Wood, cans or the like can be retained by screening plants. The However, se screening plants have the disadvantage that they do not require mechanical cleaning clogging relatively quickly in the event of strong relief events and thus the sieve effect is lost.

With such relief structures in mixed sewage systems, there is already a Reini supply device for screening devices that prevent clogging should. This cleaning device has a screw helix that floats substances removed in the axial direction from the screening device. The cleaning of Drilling a curved screen surface is done by brushing on the face the helix are attached. The floating substances are through the Screw spiral axially into a calm zone in front of an overflow threshold  Retention basin or storage space transported back, which then with the in the rear mixed water in the holding basin can be rinsed to the sewage system.

However, such helix have the disadvantage that the brushes meander be moved to the screen surface and thus shear forces against the Drilling the sieve surface on floating substances held on it, which leads to egg jamming of the floating materials with the helix or to shredding the Floating substances can lead themselves. This allows the holes in the face clog. In addition, other mechanical influences can be caused by the rotary movement of the Helical spiral act on the floating materials during transport in the axial direction.

The object of the invention is to provide a relief device in the mixed water channel tion to create, in which collected and retained by a screening device Floating materials of the mixed water can be removed easily.

The invention solves the problem with the subject of the main claim.

By designing the cleaning device as one arranged on a shaft Channel with at least one cleaning arranged on the trailing flank limb can rub against the sieve during the cleaning process fen. Due to the simple rotary movement around the central axis of the shaft, only Ra Dial forces from the cleaning member act on the floating materials. The floating substances can be transported radially upwards to be taken up by the gutter to become. The floating substances can then be free, i.e. without further legs inferences, transported away via this trough and removed from the screening device leads.

With the features of claim 2 can be achieved that essentially all Floating substances retained directly over the entire length of the sieve device the gutter arrive and can be removed. In addition, through the substantially further groove extending over the entire length of the shaft there are no influences and influences on the floating materials.  

The features of claims 3 to 6 ensure that the folding channel in one fold way and can be safely transported away in the channel recorded floating substances can be guaranteed. Here is the gutter because of the gutter preferably flat, so that the floating materials due to the Slope or the slope of the channel base can slide down and in the axial Direction along the shaft can be dissipated. Through the V-shaped arrangement Neten flanks formed groove, which is arranged on the shaft, a Reini supply device with a small mass to be moved or a small Moment of inertia. This can also be a cleaning device driving drive unit to be weaker and lower energy have consumption.

The flanks of the channels can be reinforced by the features of claim 7, so that no deformation of the channel can occur during the cleaning process and larger ones retained on the screening device and partially ver jammed floating substances can be removed from the screening device.

The features of claim 8 give a simple execution option for a Gutter again.

A filter device is created with the features of claims 9 to 11 which a large number of floating substances are caught and retained can. Due to the preferably lamellar arrangement of the rake bars, the Spaces between the individual slats should be small, so that a high degree of cleaning can be achieved. That or the cleaning members on the trailing flank of the gutter can due to the complementary radius of curvature the surface of the sieve device facing the shaft over the entire height of the sieve device to be cleaned.

Due to the features of claim 12 there can be no jamming between the Screening device and the cleaning element come. The individual brushes can engage between the lamellae of the screening device and roam the screen direction comb-like from its end arranged on the overflow threshold to the  free ends of the slide bars. As a result, the at least partially between Floating substances arranged between the lamellae are removed from the screening device leads.

The cleaning brushes are preferably flexible, so that even with one floating bodies jammed between the rake bars do not jam tion of the cleaning elements can come to the sieve device, as this Paint over the float without affecting the rotation.

Due to the features of claims 13 and 14, the cleaning brushes can be simple and can be exchanged quickly. Due to the multi-part training individual damaged or worn segments of the cleaning process brushes can be replaced.

Due to the features of claim 15, the cleaning members can have a high Le have lifespan.

Due to the features of claim 16, a particularly favorable cleaning can with a high degree of cleaning by combing out the lamellar Rulers can be achieved. In addition, a simple drive without changing the direction of rotation sweeping are enough.

Due to the features of claim 17, those recorded in the channel can Floating substances can be washed away easily and quickly into another pool before they fall out of the gutter due to the rotation of the shaft would and get back into the inlet area of the rain overflow basin.

Due to the features of claims 17 and 18, the washing away of the rin ne absorbed floating substances supported. To do this, preferably at an 11 o'clock until in a 1 o'clock position the gutter mixed water from the inlet area of the rain overflow basin are sprayed into the channel, so that the floating substances as quickly as possible possible to be washed away. The spraying device can be Position of the gutter should preferably be arranged above the gutter, so that already un indirectly after the brushes emerge from the sieving device, the rinsing process  can begin, and thus the channel with all probability from the floating material fen is released before it rotates to a 3 or 4 o'clock position passes through and the floating substances independently again from the gutter into the inlet space could leak.

Due to the features of claim 20, the recorded in the channel and floating substances washed out of the channel by the rinsing process via the ent drainage channel can be flushed into a rainwater retention basin. This drainage channel provides a connection between the rain overflow basin and the rain retention basin. The floating materials that are fed into the rainwater retention basin and that of the Screening device have been caught and retained, with the in this Mixed water from the pool is fed to a sewage treatment plant.

The features of claim 22 can ensure that the in the channel Floating substances absorbed during the greatest possible duration of the rotation channel can be washed away and transported away. So it can be safe be set that the floating substances taken up in the channel completely from the Gutter can be washed away and discharged into the rainwater retention basin will.

Due to the features of claims 23 to 25, a structurally simple manner steady washing away of the floating materials in the rainwater retention basin his. The small distance between the channel arranged on the shaft and the Emptying trough enables essentially those taken up by the trough Floating materials are completely channeled into another basin via the emptying channel will. This can be done in particular by adding detergent, which creates a high flow rate of the floating materials when he reaches the emptying channel enough can be ensured.

By the features of claim 26 can be achieved that only when needed for example in heavy rain events, the cleaning process of the screening device is carried out.  

Due to the features of claim 27, a streamlined arrangement in the rain overflow basin can be achieved, so that both a favorable inflow and the mixed water can run off quickly.

Due to the features of claim 28, a cleaning device can already be standing relief structures are used. To do this, the shaft with the on it arranged gutter to the different dimensions or spatial areas be adjusted in length so that the cleaning device with the appropriate screening device can be installed later.

The invention will now be described with reference to a preferred embodiment ben. The drawing shows:

Fig. 1 is a schematic plan view from above of a rain overflow basin having a screening device and a cleaning device,

Fig. 2 is a schematic side view of the cleaning device,

Fig. 3 is a schematic sectional view taken along the line II in FIG. 1.

In the relief structure shown, a rain overflow basin 11 with an inlet 12 and an outlet 13 for mixed water is shown as an example. The rainwater overflow basin 11 is separated by an overflow threshold 14 into an inlet space 16 and an overflow space 17 . On the overflow threshold 14 , a sieve device 18 is angeord net, the floats 19 , which are carried in the mixed water, can collect and retain. Along this screening device 18 there is a cleaning device 21 which has a shaft 23 driven by a motor 22 and two channels 24 arranged thereon. The motor 22 drives the shaft 23 in the direction of rotation 26 . On a trailing flank 27 of the trough 24 , cleaning members 29 are arranged which act on the sieve device 18 and clean it.

The channel 24 extends in the longitudinal direction of the shaft 23 over its entire length and has a channel base 31 lying between the flanks 27 , 28 . At the end of the trough 24 opposite the motor 22 , an emptying trough 32 is arranged in the extension of the longitudinal axis and extends from the rain overflow basin 11 into a further basin 33, for example into a rain retention basin.

The overflow threshold 14 is arranged diagonally in the rain overflow basin 11 , so that the respective inlet 12 and outlet 13 opposite inlet 16 and outlet 17 is formed as large as possible. This allows favorable flow properties to be achieved, so that a trouble-free inflow or rapid outflow of the screened mixed water can take place via the outlet 13 .

At the end of the shaft 23 facing the motor 22 , a flushing device 34 is seen before, which supplies mixed water via a pump 36 to the channel 24 . As a result, the floating substances 19 taken up in the channel 24 during the cleaning process of the screening device ( 18 ) can be washed off and fed to the rainwater retention basin 33 via the emptying channel 32 .

FIG. 2 shows a schematic side view of the cleaning device 21 . This shows an upper and a lower groove 24 which are spaced from each other at an angle of 180 °. The upper channel 24 is shown in section. It shows a channel bottom 31 with a gradient at an angle α, which is inclined in the direction of the discharge channel 32 . The gradient α of the channel substrate 31 is such bemes sen that received in the channel 24 floating substances can be completely washed away from the trough 24 through the drain 19 and genrückhaltebecken trough 32 in the Re can reach 33rd The gradient α extends over the entire length of the channel 24 and decreases continuously.

The distance between the channel bottom 31 and the emptying channel 32 is kept low ge, so that a complete washing away of the floating substances 19 into the rain retention basin 33 is ensured. An intermediate small gap can be neglected ver, since the floating substances 19 are washed out of the channel 24 at a certain flow rate and are further washed away via the emptying channel 32 . The drainage channel 32 advantageously has a gradient β which corresponds to the gradient α of the channel base 31 . The emptying trough 32 can also have a steeper slope, so that an even faster drainage of the floating substances 19 is possible. Viewed in cross section, the emptying channel 32 has a channel bottom 43 which is wider than the channel bottom 31 of the channel 24 , but is at least of the same width. The channel bottom 43 of the emptying channel 32 is delimited by edges 44 arranged in a flat V-shape.

On the upper edge of the trailing flank 27 , the cleaning members 29 are arranged over the entire length of the flank 27 and interact with the screening device 18 . The screening device 18 has a plurality of parallel spaced rake bars 37 , which are lamellar. At their lower end, the rake bars 37 are fastened to the overflow threshold 14 and have free ends opposite them.

The cleaning members 29 are designed as brushes which engage at least partially on the rake bars 37 or can intervene in the interstices formed by the rake bars 37 . As a result, the brushes 29 can comb out the screening device 18 and remove the retained floating substances 19 . The brushes 29 can be made of plastic, so that the flexibility of the brushes 29 prevents jamming with the screening device 18 . The brushes 29 can advantageously be interchangeably attached as brush strips to the trailing flank 27 , so that worn brush strips can be replaced individually.

Fig. 3 shows a schematic sectional view along the line II in Fig. 1. The cleaning device 21 is shown in a position in which the one channel 24 in a 0 o'clock position and the other channel 24 in a 6 o'clock position. Position is arranged. The Rin ne 24 is fixed to the shaft 23 . This can preferably have a welded joint or other known connections. There can also be a releasable connection for easy replacement in the event of damage or for easy assembly. The flanks 27 , 28 are reinforced by support elements 38 in their V-shaped arrangement, so that the forces acting during the cleaning process via the brushes 29, in particular on the trailing flank 27 , can be absorbed. The support elements 38 can be designed as angle profiles or the like, which are firstly substantially over the entire height of the flank and are supported on the shaft 23 at their opposite end. In addition Lich reinforcements or struts in the longitudinal axis of the shaft 23 can be provided on the flanks 27 , 28 between the support elements 38 . This can be done by additionally on the outside of the flanks 27 , 28 attached reinforcing plates or profile plates. The channel 24 is preferably designed as a sheet metal structure, so that the channel base 31 with the flanks 27 , 28 can be produced, for example, by means of a rivet, solder or spot weld connection or the like.

In the exemplary embodiment, two channels are exemplary net angeord on a shaft 23 . Depending on the application, the cleaning device can have only one channel 24 or a plurality of channels 24 . Two or three channels are advantageous so that at least one channel 24 is in engagement with the screening device 18 during the cleaning process.

The mode of operation of the cleaning device 21 is described in more detail below:

As soon as the rain overflow basin 11 flowing Mi in the rain overflow basin 11 exceeds a liquid level 41 during heavy downpours, the cleaning device 21 starts moving in the direction of rotation according to arrow 26 . The brushes 29 arranged on the trailing flank 27 of the channel 24 come into engagement with the screening device 18 in an 8 o'clock position. Ben on the rakes 37 of the screening device 18 captured and retained floating substances 19 are carried by the brushes in the direction of rotation 26 and catch up in the channel 24 . Through the upper free ends of the rake bars 37 , the brushes 29 engaging between the rake bars 37 can emerge unhindered and take the floating substances 19 in between and take them out so that they can be taken along by the trough 24 . The brushes 29 emerge from the screening device 18 in an 11 o'clock position. The collected floating substances 19 can flow off on the trailing flank 27 into the channel bottom 31 .

As soon as the gutter 24 passes through the 11 o'clock position, the rinsing process begins. Via egg ne pump 36 mixed water is fed to a flushing nozzle 42 of the flushing device 34 and sprayed into the channel 24 . As a result, the floating substances 19 accommodated in the channel 24 can be rinsed off or washed away quickly and easily. The floating materials 19 slide due to the gradient α in the longitudinal direction to the emptying channel 32 and can be washed off via this in the rain retention basin 33 . The flushing process preferably continues until the channel 24 has reached a 1 o'clock position and exits the spray area of the flushing nozzle 42 . Since with the floating in the channel 24 floating substances NEN can run with certainty, the adjacent to the channel 24 emptying channel 32 in its cross-section de rart flat that they carry the floating materials 19 in the channel 24 from a 10 o'clock position Channel 24 can take up to a 2 o'clock position and lead away.

When the 2 o'clock position of one channel 24 is reached , the other channel 24 already engages or engages the screening device 18 again. This starts a new cleaning process. As soon as the mixed water in the rain overflow basin 11 has dropped below the liquid level 41 , the motor 22 driving the cleaning device 21 is switched off and the cleaning process is ended. The shaft 23 can preferably be stopped in a position as shown in FIG. 3 and the flushing device 34 can be switched off after a short period of operation, so that the channel 24 can be completely freed from the floating substances 19 .

Claims (29)

1. Relief device for the mixed water sewerage, in particular for rainwater treatment,

• - with a rain overflow basin,
• with an overflow threshold which at least partially separates the rain overflow basin into an inlet space and an outlet space,
• with a floating material screening device arranged on an overflow threshold,
• with a cleaning device cleaning the screening device, cleaning elements being provided on a shaft which act on the screening device,

characterized in that the cleaning device ( 21 ) has a shaft ( 23 ) with at least one groove ( 24 ) arranged thereon, on the trailing flank ( 27 ) of which at least one cleaning member ( 29 ) is arranged. 2. Relief device according to claim 1, characterized in that the channel ( 24 ) extends in the longitudinal direction substantially over the entire length of the shaft ( 23 ). 3. Relief device according to claims 1 or 2, characterized in that the channel has substantially V-shaped associated flanks ( 27 , 28 ). 4. Relief device according to one or more of the preceding Ansprü surface, characterized in that the channel ( 24 ) has a between the flanks ( 27 , 28 ) arranged channel base ( 31 ) which on one end of the shaft ( 23 ) has a gradient under one Has angle (α). 5. Relief device according to claim 4, characterized in that the Ge cases of the channel bottom ( 31 ) is just large enough that in the channel bottom ( 31 ) received floating materials ( 19 ) just slide down. 6. Relief device according to claim 4 or 5, characterized in that the channel base ( 31 ) is substantially planar. 7. relief device according to one or more of the preceding Ansprü surface, characterized in that the channel ( 24 ) has the flanks ( 27 , 28 ) supporting de supporting elements ( 38 ). 8. relief device according to one or more of the preceding Ansprü surface, characterized in that the channel ( 24 ) is designed as a bent sheet metal part with an inserted channel base ( 31 ). 9. relief device according to one or more of the preceding Ansprü surface, characterized in that the screening device ( 18 ) has a plurality of spaced-apart rake bars ( 37 ) which are arranged on the overflow threshold ( 14 ). 10. Relief device according to claim 9, characterized in that the re chenstellen ( 37 ) are lamellar. 11. Relief device according to claim 9 or 10, characterized in that the shaft ( 23 ) facing, by the rake bars ( 37 ) formed surfaces of the screening device ( 18 ) has a cleaning radius ( 21 ) corresponding radius of curvature. 12. Relief device according to one or more of the preceding Ansprü surface, characterized in that the cleaning member ( 29 ) extends substantially over the entire trailing flank ( 27 ) and is preferably bürstenför shaped. 13. Relief device according to claim 12, characterized in that the Rei cleaning member ( 29 ) is formed as a one-piece, preferably as a multi-part brush belt. 14. Relief device according to claim 12 or 13, characterized in that the cleaning member ( 29 ) is replaceable on the trailing flank ( 27 ) angeord net. 15. Relief device according to one of claims 12-14, characterized in net that the cleaning member is designed as a flexible brush. 16. Relief device according to one or more of the preceding claims, characterized in that the cleaning device ( 21 ) engages at one of the overflow threshold ( 14 ) associated end on the screening device ( 18 ) and rotates in the direction of the free ends of the screening device ( 18 ) is. 17. Relief device according to one or more of the preceding claims, characterized in that at one end of the channel base ( 31 ) at which the distance between the channel base ( 31 ) and the axis center of the shaft ( 23 ) is greatest, a flushing device ( 34 ) is arranged. 18. Relief device according to claim 17, characterized in that the flushing device ( 34 ) above the channel ( 24 ) is arranged substantially in a 0 o'clock position of the channel ( 24 ). 19. Relief device according to claim 17 or 18, characterized in that the rinsing device ( 34 ) working with mixed water can be actuated during a cleaning process in which the channel ( 24 ) is transferred from an 11 o'clock position to a 1 o'clock position is. 20. Relief device according to one or more of the preceding Ansprü surface, characterized in that at the lowest point of the channel base ( 31 ) on the channel ( 24 ) opposite a relief channel ( 32 ) is arranged. 21. Relief device according to claim 20, characterized in that the floating material ( 19 ) taken up by the emptying channel ( 32 ) can be washed off into a further basin ( 33 ). 22. Relief device according to claim 20 or 21, characterized in that from the trough ( 24 ) from a 10 o'clock position to a 2 o'clock position taken up floating materials ( 19 ) can be washed off via the emptying trough ( 32 ). 23. Relief device according to one of claims 20-22, characterized in that the drainage channel ( 22 ) has a gradient which is equal to or greater than the gradient (α) of the channel base ( 31 ). 24. Relief device according to one of claims 20-23, characterized in that the distance formed between the channel bottom ( 31 ) and the relief channel ( 32 ) is formed small. 25. Relief device according to one of claims 20-24, characterized in that the relief channel ( 32 ) has a substantially flat channel bottom ( 43 ) with a substantially flat V-shaped edges ( 44 ). 26. Relief device according to one or more of the preceding claims, characterized in that the cleaning device ( 21 ) is water level-dependent and drivable. 27. Relief device according to one or more of the preceding claims, characterized in that the overflow threshold ( 14 ) is seen diagonally in a top view from above in a rain overflow basin ( 11 ) and separates an inlet space ( 16 ) to an outlet space ( 17 ). 28. Relief device according to one or more of the preceding claims, characterized in that the cleaning device ( 21 ) can be retrofitted.