AT16672U1 - Sewer cleaning vehicle - Google Patents

Abstract

Sewer cleaning vehicle (1) with a sludge tank (3) having a sludge-receiving cavity (2) and with a vacuum pump (4) for generating negative pressure in the sludge-receiving cavity (2) and with a sludge suction nozzle (5) for sucking in sludge (6) into the sludge-receiving cavity (2) and with a sludge discharge pipe (7) for discharging the sludge (6) from the sludge receiving cavity (2), the sludge tank (3) having a sludge tank bottom (8) with a curved bottom surface delimiting the sludge receiving cavity (2) downward (9), the sludge discharge pipe (7) opening into the opening (10) of the sludge tank bottom (8) into the sludge receiving cavity (2) and the entire bottom surface (9) falling towards this opening area (10), the bottom surface (9 ) of the sludge tank bottom (8), seen in a plan view of the sludge tank bottom (8), has a center (11) and this center point (11), seen in plan view, in the middle is arranged ndungsbereich (10).

Description

Description: The present invention relates to a sewer cleaning vehicle with a sludge tank having a sludge-receiving cavity and with a vacuum pump for generating a vacuum in the sludge-receiving cavity and with a sludge suction nozzle for sucking in sludge into the sludge-receiving cavity and with a sludge discharge pipe for discharging the sludge cavity from the sludge-taking cavity. wherein the sludge tank has a sludge tank bottom with a downwardly curved bottom surface delimiting the sludge receiving cavity, the sludge discharge pipe opening into an opening area of the sludge tank bottom into the sludge receiving cavity and the entire floor surface falling towards this opening area.

For the cleaning of sewage pipes both in the municipal area and in the industrial sector as well as in house sewage pipes, it is known to use sewer cleaning vehicles of the type mentioned above. However, there is an increasing demand for smaller vehicles with corresponding payload options, whereby the legally prescribed maximum total weights and wheel axle loads of the carrier vehicle of the sewer cleaning vehicle are to be observed, especially for smaller vehicles. The arrangement and design of the sludge tank, into which the sludge is sucked out of the sewage pipe, becomes particularly important, since this sludge tank continuously has different fill levels during the work of the sewer cleaning vehicle. In the case of smaller sewer cleaning vehicles in particular, sludge tanks filled to different degrees very quickly have an influence on the load on the wheel axles and on the wheel axle load distribution of the sewer cleaning vehicle.

Generic sewer cleaning vehicles are executed in the prior art with essentially cylindrical tanks, which are arranged lying on the carrier vehicle. These tanks, which are known in the prior art, are equipped with an inclined inner bottom in order to separate the sludge receiving cavity from a receiving cavity for rinsing water. This sloping floor results in large weight shifts in the sewer cleaning vehicle depending on the level of the sludge tank. The same applies if the sludge tank and any existing rinse water tank are arranged separately on the carrier vehicle. Due to the level-related shifting of loads, not only the maximum permissible total weight must be observed for sewer cleaning vehicles. Rather, the permissible loads on the individual wheel axles of the sewer cleaning vehicle are often exceeded even before the permissible total weight is reached in the prior art.

The object of the invention is to propose an improvement in generic sewer cleaning vehicles, in which the maximum permissible total weight of the sewer cleaning vehicle can be better exploited, without the maximum possible wheel axle load of the individual wheel axles of the sewer cleaning vehicle resulting in unacceptable excesses due to different fill levels in the sludge tank .

This is achieved in sewer cleaning vehicles of the type mentioned according to the invention in that the bottom surface of the sludge tank bottom, seen in a plan view of the sludge tank bottom, has a center and this center, viewed in plan view, is arranged in the mouth area.

In simple terms, it is thus provided that the mouth region, in which the sludge discharge pipe opens into the sludge receiving cavity, seen in plan view, is located in the middle of the bottom surface of the sludge tank bottom. As a result, the center of gravity of the sludge tank remains at the same location, namely in the area of the center of the bottom surface of the sludge tank bottom, even with very different filling levels of the sludge receiving cavity with respect to the sewer cleaning vehicle, so that there is no horizontal shift of the center of gravity of the load depending on the filling level of the sludge receiving cavity or the sludge tank. Hereby / 11

AT 16 672 U1 2020-04-15 Austrian patent office, the sludge tank can be optimally aligned in relation to the wheel axles of the sewer cleaning vehicle without the filling level of the sludge holding cavity being varied, which can lead to significant shifts in the wheel axle load distribution and thus to the maximum wheel axle loads being exceeded in the sewer cleaning vehicle.

The mouth region of the sludge tank bottom is the area of the sludge tank bottom in which the sludge discharge pipe connects to the sludge tank bottom and thereby opens into the sludge receiving cavity. The mouth area is an opening in the sludge tank bottom and in the bottom surface of the sludge tank bottom through which the sludge can penetrate from the sludge receiving cavity into the sludge discharge pipe so as to be discharged from the sludge receiving cavity through the sludge discharge pipe.

Since to suck the sludge into the sludge receiving cavity of the sludge receiving cavity by means of the vacuum pump under pressure, that is brought to a pressure level below the ambient pressure, the sludge tank must be designed accordingly pressure test. In order to achieve this compressive strength with the smallest possible wall thickness, the bottom surface of the bottom of the sludge tank bottom which delimits the sludge receiving cavity is curved. For this reason, it is preferably provided that the entire surface of the sludge tank delimiting the sludge receiving cavity is curved. Of course, only those areas are considered in which the surface or bottom surface of the sludge tank actually exists. In the mouth area of the sludge tank bottom, in which the sludge discharge pipe opens into the sludge receiving cavity, and in areas in which the sludge suction nozzle or a nozzle leading to the vacuum pump or an inspection nozzle, if present, or open, there is neither a surface of the sludge tank nor a bottom surface of the sludge tank bottom. so that they cannot be arched there either.

So that the sludge can be discharged as completely as possible via the sludge discharge pipe from the sludge receiving cavity, it is preferably provided that the sludge discharge pipe opens into the sludge receiving cavity exclusively in the mouth region. In other words, there is preferably exactly one mouth area, or in other words, a single mouth area in which the sludge discharge pipe opens into the sludge receiving cavity. The sludge discharge pipe is expediently sloping starting from its mouth region. In other embodiments, the sludge discharge pipe could also be designed to run horizontally or vertically. The diameter of the sludge discharge pipe is advantageously in the range from 80 mm to 500 mm. The sludge discharge pipe preferably has a shut-off valve with which the sludge discharge pipe can be closed and opened to discharge the sludge from the sludge receiving cavity.

The terms used here vertically, horizontally, above, below and obliquely relate to an operating position in which the unloaded sewer cleaning vehicle stands on a flat and horizontal surface.

Basically, the bottom surface of the sludge tank bottom bounding bottom surface of the sludge tank bottom can have all those curved configurations that, seen in plan view, allow a determination of the center of the bottom surface of the sludge tank bottom. Preferred embodiments provide that the bottom surface of the sludge tank bottom, viewed in plan view, is delimited by a circular or an elliptical edge. The center point of the floor surface is then, seen in plan view, the center point of the circle formed by the edge or the ellipse formed by the edge. In other words, the bottom surface of the sludge tank bottom, seen in the above view, has a circular or elliptical shape in preferred embodiments. One could also speak of a corresponding projection of the bottom surface of the sludge tank bottom into the horizontal from the surface of a circle or

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AT 16 672 U1 2020-04-15 Austrian patent office results in the area of an ellipse. Particularly preferred variants of the invention provide that the bottom surface of the sludge tank bottom is rotationally symmetrical with respect to an axis, preferably vertical, through the center of the bottom surface of the sludge tank bottom. Of course, this only applies to the areas in which the floor surface is actually present, i.e. not to areas in which a nozzle or a pipe, e.g. the sludge drain pipe opens into the sludge receiving cavity of the sludge tank. In the case of the axis, one could correspondingly speak of an axis of rotation or an axis of symmetry.

In order to design the bottom of the sludge tank with the downwardly curved bottom surface delimiting the sludge receiving cavity, various base shapes known per se in the prior art can be used. For example, a so-called arched floor in accordance with DIN 28013 or a dished base in accordance with DIN 28011 or other free forms. A conical design of the floor surface is also possible, to name just a few examples.

In preferred variants of sewer cleaning vehicles according to the invention it is provided that the entire surface of the sludge-receiving cavity delimiting the surface of the sludge tank is rotationally symmetrical with respect to one or the, preferably vertical, axis extending through the center of the bottom surface of the sludge tank bottom. Of course, this also only applies to areas in which the surface of the sludge tank delimiting the sludge-receiving cavity actually exists.

The sludge here is the mixture of sediment and liquid which accumulates over time in the sewer to be cleaned and is to be removed by means of the sewer cleaning vehicle. In addition to constituents of water, sand and clay, this sludge also usually has numerous contaminants in both liquid and solid form.

In order not only to remove the sludge from the sewage pipe with the sewer cleaning vehicle but also to be able to spray the sewage pipe with flushing water, preferred variants of sewer cleaning vehicles according to the invention provide that the sewer cleaning vehicle additionally has a flushing water tank and a flushing water pump and a flushing water inlet. By means of the rinse water pump, the rinse water from the rinse water tank can be pressurized such that the waste water line can be sprayed out via a hose connected to the rinse water pump in a manner known per se. The rinse water inlet is used to fill the rinse water tank with rinse water.

In the sense of an optimal wheel axle load distribution and its independence from the degree of filling of the rinsing water tank, it is advantageously provided that the rinsing water tank is arranged under the sludge tank. The rinse water tank advantageously has a slightly sloping rinse water tank floor, which drops towards the rinse water pump. In the sense of the greatest possible independence of the wheel axle load distribution from the degree of filling of the rinse water tank, it is advantageously provided that a base area of the rinse water tank, viewed in plan view, is arranged exclusively under the bottom of the sludge tank. In this context, it is preferably also provided that the flushing water tank, seen in plan view, has a flushing water tank bottom with a center and the center of the flushing water tank bottom is arranged vertically below the center of the bottom surface of the sludge tank bottom.

Preferred embodiments of sewer cleaning vehicles according to the invention provide that the sludge receiving cavity has a volume in a range from 500 liters to 3000 liters, preferably from 500 liters to 1500 liters. Furthermore, it is advantageously provided that the sludge tank has a vacuum resistance of at least 0.3 bar, preferably at least 0.9 bar, under ambient pressure.

The flushing water tank advantageously has a flushing water receiving cavity with a volume of 200 to 3000 liters.

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AT 16 672 U1 2020-04-15 Austrian Patent Office [0019] In preferred embodiments of the invention, the sewer cleaning vehicle has a carrier vehicle with a driver's cabin and a chassis frame, the sludge tank and the optionally present flushing water tank being arranged on the chassis frame or a loading platform of the carrier vehicle or are. Such vehicles are often referred to as pickups. In preferred embodiments, the carrier vehicle is a vehicle for the transportation of goods of class N1 based on the EC Directive 2007/46 / EC. These vehicles have a permissible total weight of up to 3.5 t (tons). However, the carrier vehicle can also be a vehicle for the transportation of goods of class N2 in accordance with the EC Directive 2007/46 / EC. These have a permissible total mass of more than 3.5 t to a maximum of 12 t. The wheel axle could also be referred to as the vehicle axle. The wheel axles are part of the carrier vehicle and each connect at least two wheels of the carrier vehicle to one another.

[0020] Further features and details of preferred variants of the invention are explained by way of example in the following description of the figures. Show it:

1, 2, 3, 4, 4, 5, a schematic, partially sectioned side view of a first embodiment of the invention;

a plan view of the embodiment of FIG. 1;

a plan view of the bottom surface of the sludge tank bottom of this first embodiment;

a plan view of a second embodiment of the invention and a plan view of the bottom surface of the sludge tank bottom of this second embodiment.

In the side view according to FIG. 1, shown in section in the area of the mud tank 3 and the rinsing water tank 15, it can clearly be seen that the sewer cleaning vehicle 1 of the exemplary embodiment shown here has a carrier vehicle 20 with a driver's cab 21 and a chassis frame 22. The carrier vehicle 20 shown has a total of two wheel axles 30 which connect the wheels 23 shown here in pairs in a manner known per se. Such carrier vehicles 20 are often also referred to as so-called pickups. You can also have more than two wheel axles 30 and, e.g. when using twin tires, have more than two wheels 23 per axle 30. An additional wheel axle 30 can be located in particular in the area of the rear wheel axle 30. The sludge tank 3 and the rinsing water tank 15 also present here are arranged on the chassis frame 22 of the carrier vehicle 20. The rinse water tank 15 is located under the sludge tank 3. The sewer cleaning vehicle 1 is equipped with a vacuum pump 4 for generating negative pressure in the sludge receiving cavity 2 of the sludge tank 3. Furthermore, a sludge suction nozzle 5 is provided, to which a corresponding suction hose, not shown here, can be connected. This suction hose can then be inserted with the end opposite the sludge suction nozzle 5 into the sewage pipe to be cleaned in order to suck the sludge 6 into the sludge receiving cavity 2. The vacuum required for this suction is generated by the vacuum pump 4 in the sludge receiving cavity 2. The sludge suction nozzle 5 could also be referred to as a suction connection. For emptying the sludge tank 3, the sludge discharge pipe 7 opens into the sludge receiving cavity 2. The sludge discharge pipe 7, as shown here, is advantageously arranged at an incline and can be closed by a shut-off valve 25. The shut-off valve 25 is opened to drain the sludge 6 from the sludge receiving cavity 2. Otherwise, it is closed, so that correspondingly negative pressure is generated in the sludge receiving cavity 2 and the sludge 6 can be collected.

Deviating from the variant shown here, the sludge discharge pipe 7 can also be arranged to run horizontally or vertically.

The sludge tank bottom 8 is the downward-facing part of the sludge tank 3. The

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AT 16 672 U1 2020-04-15 Austrian patent office

Sludge tank bottom 8 has a downwardly curved bottom surface 9 that delimits the sludge receiving cavity 2 downward. In the mouth area 10 of the sludge tank bottom 8, the sludge discharge pipe 7 opens into the sludge receiving cavity 2. The entire bottom surface 9 drops towards this mouth area 10. This ensures that when the sludge tank 3 is emptied via the sludge drain pipe 7, no sludge 6 can collect in other recessed areas of the sludge tank bottom 8 or the bottom surface 9, so that the entire sludge 6 passes through the mouth area 10 of the bottom surface 9 and the sludge drain pipe 7 the sludge receiving cavity 2 can be removed. According to the invention, it is now provided that the center point 11 of the bottom surface 9 of the sludge tank bottom 8, in which, e.g. 3, seen in plan view, is arranged in the mouth region 10. The center point 11 of the sludge tank bottom 8 is shown in FIG. 1 and in FIG. 3. In FIG. 3, the upper part of the sludge tank 27 is not shown, so that in FIG. 3 a top view of the bottom surface 9 of the sludge tank bottom 8 and the mouth area 10 can be seen. The vertical axis 13 runs through the center 11 of the sludge tank bottom 8 with respect to the bottom surface 9 of the sludge tank bottom 8, in preferred embodiments such as that shown in FIGS. 1 to 3.

In the exemplary embodiment shown in FIGS. 1 to 3, the sludge tank upper part 27 connects directly to the sludge tank bottom 8. In other embodiments, the sludge tank 3 can also have a brim area, e.g., between the sludge tank bottom 8 and the sludge tank upper part 27. with a cylindrical jacket-shaped configuration. 3 that the bottom surface 9 of the sludge tank bottom 8 is delimited by a circular edge 12 in this first embodiment. The center point 11, seen in plan view, is the center of the circle of the circular edge 12. In order to achieve the required compressive strength with as little wall thickness as possible, the entire surface 14 is curved in this as well as in other preferred embodiments. This therefore preferably applies not only to the bottom surface 9 of the sludge tank base 8 but also to the corresponding regions of the sludge tank upper part 27 which delimit the sludge receiving cavity 2 upwards or the brim which may not be shown here but which may be present.

In the exemplary embodiment shown, the connection for the vacuum pump 4, the sludge suction nozzle 5 and a revision nozzle 24 open into the sludge tank upper part 27, which serves in this exemplary embodiment to be able to clean the sludge receiving cavity 2 in the sludge tank 3 as completely as possible. 1 to 3, the entire surface 14 of the sludge tank 3 delimiting the sludge receiving cavity 2 is rotationally symmetrical with respect to the axis 13 running vertically through the center 11 of the bottom surface 9 of the sludge tank bottom 8 .

The rinse water tank 15 is arranged under the sludge tank 3. It can be filled with flushing water through the flushing water inlet 17, which could also be referred to as a filling connection. By means of the rinse water pump 16, the rinse water removed from the rinse water tank 15 is pressurized in such a way that it can be used by means of a hose (not shown here) connected to the rinse water pump 16 to spray out the waste water line to be cleaned.

As can be seen particularly well in FIG. 2, the base area 18 of the washing tank 15 is seen in a top view, arranged exclusively under the sludge tank bottom 8. The top view of the flushing water tank bottom 26 of the flushing water tank 15 has a center 19, which is arranged vertically below the center 11 of the bottom surface 9 of the sludge tank bottom 8. Both center points 19 and 11 are thus on the axis 13. The flushing water tank bottom 26 is advantageously designed to slope slightly towards the connection of the flushing water pump 16.

4 and 5 show an alternative embodiment, in which the edge 12, which delimits the bottom surface 9 of the sludge tank bottom 8, as seen in plan view, does not

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AT 16 672 U1 2020-04-15 Austrian patent office is circular but elliptical. 5, in which the top part of the sludge tank 27 is omitted, the bottom surface 9 of the bottom of the sludge tank 8 thus has an elliptical shape. Here too, the center 11 of the bottom surface 9 of the sludge tank bottom 8, viewed in plan view, is arranged in the mouth region 10 of the sludge tank bottom 8. This center point 11 of the bottom surface 9 of the sludge tank bottom 8, which is visible in FIG. 5, in turn lies on the axis 13, just like the center point 19 of the rinsing water tank 15, which is arranged below the sludge tank 3 in an analogous manner and is not visible in FIGS. Otherwise, the explanations for the first exemplary embodiment also apply where applicable, so that repetitions in this regard are dispensed with.

The width of the sludge tank 3 and the rinse water tank 15 in the transverse direction 29 is limited by the maximum possible vehicle width and is advantageously in the range between 1000 mm and 2500 mm. The length of the sludge tank 3 and the rinse water tank 15 in the longitudinal direction 28 can be adapted to the corresponding vehicle length, in particular in the case of elliptical basic shapes as in FIGS. 4 and 5.

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AT 16 672 U1 2020-04-15 Austrian patent office

LEGEND

TO THE NOTES:

Sewer cleaning vehicle

Sludge receiving cavity

Mud tank

Vacuum pump

Sludge inlet

mud

Sludge discharge pipe

Sludge tank bottom

Floor surface

Mouth area

Focus

edge

axis

surface

Rinse water tank

Rinse water pump

Rinse water inlet

Floor space

Focus

Carrier vehicle

Driver's cabin

Chassis frame

wheel

Inspection nozzle

Shut-off valve

Flush water tank floor

Sludge tank top

Longitudinal direction

Cross direction

Wheel axle

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AT 16 672 U1 2020-04-15 Austrian

Claims (10)

Expectations 1.Duct cleaning vehicle (1) with a sludge tank (3) having a sludge-receiving cavity (2) and with a vacuum pump (4) for generating a vacuum in the sludge-receiving cavity (2) and with a sludge suction nozzle (5) for sucking in sludge (6) in the sludge receiving cavity (2) and with a sludge discharge pipe (7) for discharging the sludge (6) from the sludge receiving cavity (2), the sludge tank (3) having a sludge tank bottom (8) with a curved downward sludge receiving sludge cavity (2) has a delimiting bottom surface (9), the sludge discharge pipe (7) opening into the sludge receiving cavity (2) in a mouth region (10) of the sludge tank bottom (8) and the entire bottom surface (9) falling towards this mouth region (10), characterized in that that the bottom surface (9) of the sludge tank bottom (8), seen in a plan view of the sludge tank bottom (8), has a center point (11) and this center point (11), in de r seen from above, is arranged in the mouth region (10). 2. sewer cleaning vehicle (1) according to claim 1, characterized in that the sludge discharge pipe (7) opens only in the mouth region (10) in the sludge receiving cavity (2). 3. sewer cleaning vehicle (1) according to claim 1 or 2, characterized in that the bottom surface (9) of the sludge tank bottom (8), seen in plan view, is delimited by a circular or an elliptical edge (12). 4. sewer cleaning vehicle (1) according to one of claims 1 to 3, characterized in that the bottom surface (9) of the bottom surface (9) of the sludge tank bottom (8) with respect to one, preferably vertically, through the center (11) of the sludge tank bottom (8) extending axis (13) is rotationally symmetrical. 5. sewer cleaning vehicle (1) according to one of claims 1 to 4, characterized in that the entire, the sludge receiving cavity (2) delimiting surface (14) of the sludge tank (3) curved and / or rotationally symmetrical with respect to one or, preferably vertically, through the center (11) of the sludge tank bottom (8) extending axis (13). 6. sewer cleaning vehicle (1) according to one of claims 1 to 5, characterized in that the sewer cleaning vehicle (1) additionally has a rinse water tank (15) and a rinse water pump (16) and a rinse water inlet (17). 7. sewer cleaning vehicle (1) according to claim 6, characterized in that the rinsing water tank (15) is arranged under the sludge tank (3). 8. sewer cleaning vehicle (1) according to claim 6 or 7, characterized in that a base (18) of the rinsing water tank (15), seen in plan view, is arranged exclusively under the sludge tank bottom (8) and / or that the rinsing water tank (15) , seen in plan view, has a flushing water tank bottom (26) with a center point (19) and the center point (19) of the flushing water tank bottom (26) is arranged vertically below the center point (11) of the bottom surface (9) of the sludge tank bottom (8). 9. sewer cleaning vehicle (1) according to one of claims 1 to 8, characterized in that the sludge receiving cavity (2) has a volume in a range from 500 liters to 3000 liters, preferably from 500 liters to 1500 liters, and / or that the sludge tank (3) has a vacuum strength of at least 0.3 bar, preferably at least 0.9 bar, under ambient pressure. 8/11 AT 16 672 U1 2020-04-15 Austrian patent office 10. sewer cleaning vehicle (1) according to one of claims 1 to 9, characterized in that the sewer cleaning vehicle (1) has a carrier vehicle (20) with a driver's cab (21) and a chassis frame (22), wherein the sludge tank (3) and any existing rinsing water tank (15) is or are arranged on the chassis frame (22).