DE641863C - Emergency outlet screen with fixed screen surfaces to be cleaned by a backward directed flushing flow - Google Patents

Description

Emergency outlet rake with fixed, through a backwards Flushing flow to be cleaned sieve surfaces The invention relates to a sieve system through .the amount of waste water overflowing from a waste water collector into a natural outlet channel from. their coarsest pollutants should be freed. ' For this job you have already sieve surfaces. suggested that - built into, the sewage collector itself and kept pure by the power of flowing water. That through The water draining off the sieves presses the. Contaminants so tight against the screen surface; that they are not carried away by the dirty water flowing away under the sieve surfaces can be. Such sieves therefore clog very quickly. You have to go to cleaning such sieves revolving or reciprocating scrapers proposed by which stripped the material to be sieved from the sieve surfaces and into the stream of the flowing Dirty water deported. shall be. Such mechanical wipers can also Do not permanently prevent the sieves from becoming clogged with narrow passageways, they also have many moving parts that are located within the dirty water flow move and are therefore subject to severe wear and tear. One still has Sieve drums arranged in sewers, special for their cleaning: circumferential Creator to be used. This = scoop up the excreted substances - initially from Drum shell from, .that are then sucked off by a pump through the scoop. The sieve drum lies completely in the water, so that with the circling scoops not only a mechanical detachment is achieved and a suction from the inside of the "Drum, should-Bern also to a certain extent through the sieve mesh. It works thus through. the screen surface to be cleaned also has a backward flushing flow.

The invention is a Notauslaßrechen that should be avoided by applying a reverse flushing flow for cleaning the screen surfaces and by its special design, the disadvantages of the previously known loading become Notauslaßrechen. According to the invention, sieve surfaces are arranged in the emergency outlet duct below the overflow sill of the main duct and immediately behind this, and a basic sill protruding beyond the sieve baths. Movable flushing pipes are located above the bottom of these sieve surfaces. whose drainpipe is connected to the relieved main channel with a natural gradient or by a feed pump. The sieve can consist of a fine bottom sieve and of higher-lying sieve side surfaces connected to it. In addition, a cover sieve can be present at the level of the upper edge of the sieve side surfaces. the: bottom sieve. The rear surface of the basic wave becomes one. give back; steep surface. A small bottom drainage pipe is provided in the base sill. By damming up the water that has been screened off, the largest possible screening surface is effective even with small overflow quantities. At the same time, however, this ensures that there is always a backward flushing flow for cleaning the sieve. The bottom drain pipe in the bottom sill has the task of draining the purified water above the ground sills into the receiving water after the rain has stopped, so that the: sieving device can run dry and remains accessible when it is idle.

The device according to the invention is to be distinguished from another proposed arrangement in which connected by bumps rinsing chambers are formed with baffles, with a natural gradient backwards Drain towards the sewer. These rinsing chambers should be due to their special Shaping Form cover rollers with a reverse direction of rotation in the uncleaned wastewater stream. The screens are and are arranged essentially above these cover rollers flowed through from bottom to top. The bottom of these screens sits near the top the high basic thresholds.

An embodiment of the present invention is shown in the drawing in three pictures.

Fig. I shows a vertical section through the wastewater channel cc to be relieved and the drainage channel b for the overflow water.

Fig.2 shows the associated floor plan, Fig.3 shows a modification to the section of Fig. i.

The mixed water arriving in the sewer a falls in the Arrangement of Fig. I with increasing filling of the canal in a known manner over the overflow threshold c hi.n, - # veg into the Ndtauslaß- or rain relief channel b. In the overflow chamber d, the sieve surface e is arranged horizontally. That about the Water falling over the threshold c falls through this sieve surface e onto the Sole of the rain discharge: canal b. When raid c goes into action, will in any known manner the carriage / over the inlet side of the screen surface e moved back and forth. The tubes forming the slide, which at their free end are equipped with rollers h, have in the vicinity of the sieve surface on their entire Length an open slot through which rinse water from the bottom of the Sieve surface can be sucked into it. The Saugwixküng arises in the arrangement the Fig. i and 2 in that the carriage f is in open connection with the fixed Pipeline i is standing, which leads to the pump. The pumps k convey the flushing water drawn in into the relieved groundwater sewer. To this sucking back the rinse water to allow through the sieve surfaces into the tubes g, it is necessary to through the overflow threshold in, the screened water so high in the rain overflow channel b to accumulate so that the water level is at least slightly above the basic threshold protrudes. If the threshold in were not present, it would be lower in The amount of water in the water level in the discharge channel b is so deep @einstelleia that a Backward suction of screened water through the screen surface e into the suction pipes g 'would no longer be possible, cleaning the screen surface would then not be easier can be achieved.

With the arrangement of Fig. I, the hole width in the sieve surface e chosen so small that relatively fine pollutants are retained will. This option is of particular importance because it is particularly low Overflow Amount The holdup water carries a large amount of contaminants with it. Due to the small passage width of the sieve surface e, however, there is a risk of that in the case of heavy rainfall, the amount of passage through the sieve area no longer sufficient. Since the rinsed off dirty water is stronger when it rains heavier is diluted, in this case: such a strong screening is no longer necessary. According to the present invention, the lower screen surface should therefore, if necessary e supplemented by further sieve surfaces jt and o «earth the sieve lining with larger Through openings is equipped, so that additional overflow amounts Sieve surfaces come into effect, their performance also because of the larger Passage openings is selected correspondingly larger.

The slide / can also be equipped with high suction pipes p be equipped, which also these upper sieve surfaces by backwashing from the retained Free contaminants. Should despite these measures as a result of failure of the out and forward movement of the carriage / clogging of the sieve surface e, iz and o occur, the emergency outlet can still not be used with the arrangement shown in Fig. i fail because the then untreated wastewater at the overflow edge g of the top Sieve surface o can freely overflow into the rain overflow channel b.

Can ä instead of the reciprocating movement of the cleaning tubes, as shown in Fig.3, also a circumferential movement of the cleaning tubes are selected to provide a means i Red b, wherein the sieve surfaces are formed as segments of a circle. For this solution, too, the attack threshold is an important prerequisite for the feasibility of backwashing. So that after the rain has stopped, no sewage remains above the overflow threshold m and can turn into putrefaction there, a small emptying pipe r is carried out at the S, ohl-e this natural outlet channel e through the overfall threshold m, by slowly emptying the uppermost section of the rain channel is achieved.

If the local conditions allow, there is a steep gradient in the sewerage system allow, the activation of the pump k for the rinse water can be saved be that in the course of the sewer a, a fall behind the threshold to the relieved wastewater channel L is switched on. With such an arrangement can the rinsing, water from the cleaning carriage f with a natural gradient in the relieved wastewater canal L, it is sufficient in this case to Position of the pump k in fig. I and z to switch on only one key valve, which the amount of rinse water can be regulated.

In order to provide a special source of strength for moving to and fro in such a case Making the cleaning carriage superfluous can be used for tile movement in an As is known, the power of falling water can be harnessed. Here, the drive turbine can be placed in the wastewater sewer or, better still, in the rain overflow sewer to be built in.

Claims (5)

PATENT CLAIMS: i. Emergency outlet rake with fixed, through one backward flushing flow to be cleaned screen surfaces, characterized in that that in the, \ dead outlet channel (b) below the overflow threshold (c) of the main channel (a) and immediately behind this sieve surface and behind that one protruding beyond the sieve bottom The basic threshold (in) is ordered by type, and that the flushing pipes are movable above the sieve bottom (g) lie., whose drain pipe has a natural gradient or a feed pump (k) is in communication with the relieved main channel (a). 2. Emergency outlet rake after the claim i, characterized in that the sieve consists of a bottom sieve and with this connected higher screen side surfaces consists. 3. Emergency exit rake according to claims i and 2, characterized by a level with the upper edges of the Cover sieve lying on the side surfaces of the sieve (o). q .. Emergency outlet rake according to the claims i to 3, characterized in that the sieve surfaces connected to the bottom sieve have larger slot widths than the bottom sieve. 5. Emergency outlet rake according to the claims i to q., characterized by a steep rear surface of the basic threshold (m). 6. \ T.otauslaßrechen according to claim i and 5, characterized in that in a small bottom drain pipe (r) is provided for the base sill (m).