EP3130712A1 - Waste water pumping station - Google Patents

Abstract

Sewage lifting plant (1) comprising a collecting tank (4) for waste water and at least one pump unit (5) for pumping the waste water from the collecting tank, wherein the pump unit (5) has a pump housing (41) with an inlet in the axial direction into a pump chamber receiving an impeller and an outlet (42) in the radial direction from the pump chamber, and the collecting container (4) has a substantially cylindrical main collecting space (11) with a bottom extension (7). The extension (7) further has at least one opening (8), above which the extension (7) carries the pump unit (5) and below which a space area (14), from which during operation of the pump unit (5) the wastewater from is sucked out of the sump. It is envisaged that the longitudinal axis of the pump unit (5) is tilted relative to the vertical and the outlet (42) in the higher part of the pump housing (41). As a result, an automatic venting of the pump chamber and the extension (7) is achieved.

Description

The invention relates to a sewage lifting plant comprising a collecting tank for waste water and at least one pump unit for pumping out the wastewater from the collecting tank, wherein the pump unit has a pump housing with an inlet in the axial direction in a pump chamber receiving an impeller and an outlet in the radial direction from the pump chamber, and the collecting container has a substantially cylindrical main collecting space with a bottom-side extension, wherein the extension has at least one opening above which the extension carries the pump unit and below which lies a spatial area from which the waste water is sucked out of the collecting container during operation of the pump unit.

Collecting containers of this type are known, for example under the name WILO Drain-Lift S or WILO Drain-Lift XL. Other types of collection containers are also known from the German patent application DE 102005027091 A1 and the European patent application EP 2 489 801 A1 known. They are used in pump systems that collect wastewater, such as sewage contaminated black water or gray water, some rainwater, which accumulates below the backflow level and therefore can not be introduced via a natural gradient in the public sewer. Instead, such effluents are introduced via a sewage manifold in such a collection container. At least one pump unit then raises the wastewater as needed, usually in response to the level, via a pressure line to a geodetic height above the sewer, so that it can drain into it. It therefore pumps the wastewater out of the sump.

Wastewater lifting plants of this type occur both in the domestic area, where only the waste water of a single Wasserverbrausstelle such as a toilet, shower, a sink and / or a washing machine, a whole apartment, such as a basement apartment, or a whole house are collected, as well as commercial Buildings and building complexes such as hotels, hospitals, department stores, etc. Depending on the amount of wastewater generated, the lifting systems or their collection containers have different dimensions. The gross volume of a collection container is typically between 50 and 150 liters in the case of small domestic installations and between 300 and 400 liters in the case of large installations.

During operation of the pump unit, it may happen that air is sucked out of the main collecting space. On the one hand, this risk exists when so much wastewater is being raised that the water level drops below the container ceiling of the extension, in particular sinking to a level below the opening. Furthermore, during operation of the pump unit, a circulating suction emanating from the impeller may form in the manner of a cyclone, through the eye of which air is sucked downwards and in an arc shape to the pump chamber. In generic wastewater lifting systems, in which the discharge of the wastewater to be collected in the collecting container via the pump unit takes place, also air in the form of bubbles contained in the wastewater can get into the extension. In all cases, at least a portion of the air in the extension will rise and accumulate in the pumping chamber, where it may cause the impeller and / or other components such as plain bearings or mechanical seals to be out of water completely. For plain bearings and mechanical seals, this can be fatal as they are lubricated and cooled by the water. This causes mechanical damage to the pump set.

It is therefore an object of the present invention to reduce the risk of air accumulation in the pump chamber of the pump unit. Furthermore it is Object of the invention to provide a total of the prior art improved sewage lifting system.

This object is achieved by a wastewater lifting plant according to claim 1. Advantageous developments are given in the respective subclaims.

According to the invention a sewage lifting plant of the type mentioned is proposed in which the longitudinal axis of the pump unit is tilted relative to the vertical and the outlet is located in the higher part of the pump housing. This arrangement has the advantage that the pump chamber is vented through its outlet. The pump chamber is inclined relative to a pump unit with vertically standing motor shaft, so that in the pump chamber collecting air flows to the higher part of the pump chamber, where the outlet is located. Thus, it is ensured that no large volume of air can accumulate in the pump chamber. Another advantage of the tilted pump longitudinal axis is in a lifting system, in which the inflow of the wastewater via the pump unit, in that the connected to the outlet of the pump chamber pressure line, which takes place in the off state of the pump unit of the wastewater inlet, also obliquely so, that there is a gradient in this pressure line for the incoming wastewater. This increases the flow speed in the pressure line and reduces the risk of blockage.

The extension extends in the radial direction beyond a container wall of the main collecting space. The extension increases the floor area. The extension serves primarily as a base for the arrangement and in particular for the assembly of other components of the sewage lifting plant such as a solids separation vessel and / or the pump unit, so that no further space is necessary laterally adjacent to the collection container for these components. Instead, these components can be or are arranged on the at least one extension, ie, in front of the main collecting space, so that collection containers and components form a compact unit. Thus, the construction of the lifting system can be done largely factory and installation at the site is quick and easy. In addition, the assembly has The advantage of the pump set on the extension is that they are dry and do not have to be designed as submersible pumps, as a result of which their structural design can be considerably simpler. Finally, the pump unit also does not necessarily have to be self-priming, because the impeller is always below the filling level when the collecting container is filled accordingly.

Ideally, the outlet forms the highest point of the pump housing or the pump chamber. It is thus ensured that the air escapes from the pump chamber almost completely, so that the pump chamber is always completely filled with water.

The longitudinal axis of the pump unit may be tilted, for example, less than 10 °, in particular less than 5 °, preferably between 2 and 4 ° relative to the vertical. This comparatively small tilt is sufficient to achieve an effective venting effect, without causing a damaging one-sided load on the bearing of the pump unit.

According to a preferred embodiment, the wastewater lifting plant may comprise at least one connected to an inlet solids separation vessel which is connected to the outlet of the pump unit, so that incoming via the inlet wastewater flows through the solids separation vessel and then via the pump assembly in its disconnected state into the collection. In this embodiment, consequently, the filling of the collecting container via the pump unit and the opening in the extension takes place, wherein the waste water is previously filtered through the solids separation vessel, so that coarse or fibrous solid particles largely do not get into the collection.

By filling the collecting tank on the pump unit can be dispensed with an additional opening for the discharge of the wastewater. Furthermore, this construction has the advantage that, during operation of the pump unit, the solids separation tank connected to it is cleaned. For this purpose, the wastewater is pumped through the solids separation tank in a pressure line, from where it then flows into the sewer system. A check valve, for example in the form of a floating ball valve, at the inlet side entrance of the Solid separation vessel may be arranged closes during the lifting operation of the pump unit, the solids separation vessel, so that the wastewater is not pressed into the inlet.

The lifting system according to the invention may comprise two pump units in one embodiment, wherein the extension then has two openings, above which the extension carries one of the pump units and below each of which is a room areas, is sucked from the wastewater during operation of the respective pump unit. There are then the longitudinal axes of both pump units tilted relative to the vertical and the outlet of both pump units is in each case in the higher part of the respective pump housing. Such lifting systems are for cases in which the inflow to the lifting system during normal operation must not be interrupted. The second pump unit should be equipped with the same capacity to replace the first pump unit, at least temporarily, completely. The usual operation of the two pump sets is then alternately, i. that either one pump unit or the other pump unit go into operation.

Preferably, the opening or the two openings in the container cover is surrounded by one or in each case an annular mounting surface for mounting a pump unit or a suction tube. Under or each of the openings is then the or one of the space areas.

Suitably, the mounting surface is a mounting flange. The assembly of a pump set or suction pipe can be done directly on the mounting surface. But it is also possible to mount an intermediate ring (Adapterflansch) on the mounting surface on which then the pump unit or suction pipe is mounted. This allows a high degree of assembly flexibility, in particular if the pump unit or intake manifold is to be tilted in relation to the container. Furthermore, no adjustment to the mounting surface and the pump unit or the suction pipe must be made when one of the components to be assembled is structurally changed.

The mounting surface can basically lie in a horizontal plane. In order to still achieve a tilted arrangement of the pump or the pump units, the intermediate ring can be used, which has a wedge-shaped cross section and is arranged between the pump housing and mounting flange. However, it is advantageous if the mounting surface lies in a plane which is tilted relative to a horizontal plane, in particular tilted away in the direction away from the main collecting chamber. Both causes that with its surrounding the inlet pump housing flange on the mounting surface directly or indirectly mounted pump unit is not perpendicular, but slightly tilted away in the direction of the main collecting space. The radial direction in which the outlet extends from the pump chamber is then parallel to the slope of the mounting surface.

For example, the mounting surface (s) may be tilted by less than 10 °, in particular less than 5 °, preferably between 2 and 4 ° with respect to the horizontal plane, in order to achieve a corresponding tilting of the longitudinal axis of the pump unit or units.

Wastewater is now increasingly contaminated with oils and fats and are therefore collected in the lifting system. In particular, in operations of lifting equipment at restaurants, gas stations, car washes or garages often comes heavily mineral oil afflicted wastewater. The oils and fats initially float on the water surface and are therefore badly carried along by the pump suction. Over time, the oils and fats harden, combine with other solid particles, clump and even stick to the container wall. This is particularly disadvantageous in the field of enlargement.

In the extension, the oils and fats can then reach when lifted residual wastewater, which has not yet passed the geodesic height, when switching off the pumping pump unit from the pressure line runs back into the reservoir. However, it is considerably more problematic if the discharge of the waste water into the collection container takes place through the extension, for example via a pump unit mounted on the extension. The enlargement of the upper bounding container ceiling is formed according to the prior art.

The hydrostatic pressure exerted on the oils and fats by the accumulated waste water in the expansion causes them to be pressed against the underside of the container cover of the extension and thus tend particularly to adhere. It should also be remembered that the oils and fats become solid over time, clump together and in particular stick to other solids. There is thus an increased risk that these solid clumps thus formed settle on the container ceiling and lead there to encrustations that can not be promoted out at a next pumping out. As a result, the suction holes in the extension narrow and shorter maintenance intervals are to be provided for cleaning, the cleaning is the heavier the longer the oils and fats have remained in the container.

To avoid this, the underside of the container ceiling of the collecting container of the at least one extension at least in sections may have a slope in the direction of the main collecting space towards the top. This ensures that float in the extension floating oils and fats along the container ceiling in the direction of the main collecting space and ultimately open into it. Thus, the risk of their sticking to the container ceiling of the extension is minimized.

The slope preferably has an angle of inclination between 3 ° and 8 °. This is sufficient to ensure an increase of the oils and fats in the main collecting space and still gives the collecting container a compact design, so that other components of the lifting system can be mounted on the extension.

It is advantageous if the upper side of the container ceiling of the extension at least partially has a slope in the direction away from the main collecting space. This prevents water from accumulating on the extension. For this could happen, for example, when rainwater enters the shaft in which the collecting container and the wastewater lifting plant is set up. Such shafts usually have a relation to the footprint of the lifting system deeper collecting space in which arranged a drainage pump is to remove rainwater from the shaft. The fact that water drains from the top of the tank due to the slope also reduces the risk of slipping of a person who has to make the expansion for maintenance purposes. To reduce this risk even further, the container top of the extension can have a non-slip, especially rough surface, which ensures a firm grip under the feet when climbing the extension.

Ideally, the top of the container ceiling of the extension and the mounting surface (s) are substantially parallel so that a slope of the ceiling of the extension automatically results in the mounting surface (s) also having a slope. This ensures that the wall thickness of the container ceiling in the extension direction of the slope remains the same, whereby material and weight as a result is saved on the collecting container.

According to a preferred embodiment, at least one elongated depression is formed in the container bottom, which drops in the direction of the spatial region, where it forms a depression of the container bottom in the rear region of the extension. The container bottom thus has a surface deviating from a plane which forms the bottom of the container. This reason has a deep relief through the depression. On the one hand, the recess ensures that solid particles slip to the deep area, from where they can be effectively sucked off. Furthermore, the depression causes a flow optimization, which ensures a better entrainment of the solid particles in the suction of the wastewater. In this way, each operation of the pump unit leads to an automatic cleaning effect on the container bottom.

Preferably, this optimized tank bottom geometry can also be used in a wastewater lifting plant with two pump units. Here, it is advantageous if two elongated depressions are formed in the container bottom, which extend sloping to each have their own low area in the rear of the extension, with each of the low areas a room area for proper aspiration of the waste water. The end region of each depression, ie the corresponding depression, is then directly below one of the two openings. Thus, the suction mouth of one on the one or other assembly surface mounted pump unit or the mouth of a mounted on one or the other mounting surface suction pipe directly above a low area or at least directed to it, so that the wastewater can be sucked directly from the container bottom.

Ideally located between the wells a hill, in particular an elongated hill, which causes a spatial separation of the wells, in particular the flow guide is used. Preferably, the elevation extends along the two recesses.

The elongated depressions are thus each directed to a separate suction, so that the main flow in the container during a pumping down along one of the wells. As a result, an automatic cleaning effect is achieved in each of the wells. The elevation prevents a flow-calmed or even flow-dead zone from forming on the container bottom between the two spatial regions / suction regions and in the intermediate region along the two depressions.

Due to the elongated extent of the recesses with gradient the falling due to their own weight to the ground solid particles are largely directed in the direction of the slope and thereby guided quasi. Due to the fact that the depressions each open into a separate deep area instead of a common low level at the foot of a gradient, the solid particles sedimented within one of the depressions can be better absorbed by the suction of the waste water from the direction of the corresponding spatial area and be entrained with the flow since they accumulate in the wastewater at the bottom of the respective room area.

It should be noted at this point that the collecting container can also have two extensions, which can extend in different directions. All features mentioned above and below then apply mutatis mutandis to each of these extensions with the proviso. For example, the two areas each form their own rear area in one of the two extensions.

According to one embodiment, the recesses may be adjacent to each other, so that the hill is a substantially elongated hill. In this case, the recesses may extend substantially parallel to one another, in particular have the gradient in the same direction. According to another variant, however, the recesses may also diverge and thus describe a V-shape. According to another embodiment variant, the slopes can run in different directions, in particular in opposite directions. The depressions can also be approximately parallel, diametrically opposite or offset diametrically opposite, so that they describe an I, Z or S shape.

The slope of the depression or depressions may be less than 16 ° in the longitudinal direction of the deep regions, for example. This small gradient is sufficient to absorb sedimented sediment with the flow or entrain. On the other hand, this achieves the result that, despite the increase in the floor area on one side, the collecting container does not have to be structurally much higher and at the same time a large container volume remains.

It should also be noted that the slope does not necessarily have to be constant along the baseline of the depression or recesses. It is rather advantageous if the depression (s) have sections of different pitch in the longitudinal direction. This is especially important in view of the fact that solid waste containing wastewater flows from the suction into the sump. This is the case, for example, when the pump unit that is pumping is switched off and wastewater flows back out of the discharging pipelines, so that the solid particles are washed through the depression "high". By way of example, an area, for example a central area, which has a higher pitch than the one or the remaining areas can be formed in the gradient of the depressions. Such a region causes a particle separation when the corresponding depression is overflowed from the direction of the space region. Depending on the degree of steepness of the area, particles can be kept below the area up to a certain weight, ie they can not overcome the area of higher incline. For example, the slope of a region, in particular a middle range, which has two or three times the slope of an upper or lower range.

Overall, the relief of the soil according to the invention improves the flow within the container by the depression or respective depression acts as a creek bed when sucking the waste water from the located at its end space area. This promotes the absorption of settled particles from the soil into the suction flow and optimizes the self-cleaning effect when lifting the wastewater.

The elevation between the two depressions reduces deposits in this area. They slip by themselves to the baseline of one of the recesses and ideally further to their depth range or are entrained due to the exposed position both in the operation of one and the other pump unit.

The pump unit or the pump units can / can be arranged in or on the collecting container or externally to this, so that either the suction mouth of the / the pump unit or aggregates above the or the spatial areas or the inlet opening of a suction pipe above the or the Spaces area is, the latter is then connected to the suction of an externally arranged pump unit. A depression then extends in a direction from which a pump unit sucks the wastewater in the collecting container.

The depression or depressions are ideally modeled on a natural, shallow seabed, so that they have a slope in the direction of a longitudinally extending baseline not only in the longitudinal direction but also transversely thereto, ie to the sides. The baseline is that line which, viewed in cross-section, connects the deepest points of the depression. To the sides of the baseline rises the bottom of the depression and consequently the bottom surface. This illustrates that the container bottom not only has a slope in at least one direction, namely the extension direction of the baseline, but is overall uneven. The depression (s) accordingly has a higher starting area and a deeper lying in this end. With respect to the beginning, the depression or the depressions become ever deeper, in particular steadily, in order to avoid flow shadows.

Preferably, the two depth ranges are at the same level. In particular, they can each correspond to the lowest point of the container bottom. Incidentally, the container bottom is designed to be low-level, so that outside the deep regions at the end of the depressions there is no further deep region, in particular no such deep region is present in a possible base. This ensures that deposits can not form at any point other than at the end of the recesses or at the bottom of the room areas.

The shape of the depressions ideally corresponds at least below a certain level in the representation as a closed contour of depth essentially to the silhouette of a slipper, a kidney or a seedling. As a result, a suction flow is optimally guided through one of the recesses. In particular, a first depth line at a first level may describe the outer shape of a seedling, i. corresponding to a germinating seed, a second depth line at a second level higher than the first level, the outside shape of a kidney or kidney bean, and a third depth line at a third level higher than the second level, the outside shape of a slipper describe. As the height increases, the recesses in the container bottom become wider and thus act like a funnel. This means that the depressions become progressively narrower in the extension direction downwards, at least above a certain level, between the second and third levels. This has the effect that particles that precipitate in the raised area of the collecting container, are better sucked.

It is advantageous if the wells are "back-to-back". This means that the base line of the depressions in each case runs in an arc shape, in particular runs from the container collecting space to the suction region. Since the suction due to the hydraulic reaction of the impeller of a pump unit is a circulating flow, this geometry also has a favorable effect on the flow and enhances the suction at the respective space area opposite end of the corresponding recess, ie at the rear of the container.

According to an advantageous embodiment variant, the depressions merge into one another above a certain level. This has the advantage that a suction flow, which forms during the extraction of the waste water from the one room area along the one leading to this space a depression, also in the area above said level at the bottom of the other recess makes noticeable and entrains sedimented solid particles there.

In order to achieve a transition of the two depressions above the determined level, the elevation may have a local minimum, in particular in the region of the lower third of its longitudinal extent. This means that the elevation increases from a minimum height defining the level to the opposite end regions of the depressions. However, as the pits fall off towards the valley, this means that the difference in elevation between the baseline of the pits to one of the ridges connecting the highest points of the elevation in the cross-section becomes larger and larger. This also increases the slope of the hill to the bottom of the wells, the closer the elevation is located at the spatial areas, so that in the area between the two deep areas a greater gradient in the direction of the deep areas is present, as the hill in the rest of the area to the baseline Has depressions. This is due to the fact that the bottom area in the container between the two areas of space from which is sucked, forms a more flow-smooth area, as he is otherwise on the rise. The increased slope also reduces the risk of deposits.

The above-mentioned level, above which the two depressions merge into one another, corresponds to the stated minimum height of the elevation. Preferably, the depressions above the minimum height combine to form an overall depression, the shape of which in the representation corresponds essentially to a butterfly as a closed contour of depth. This means that the highest areas of the ground geometry lie at both ends of the length of the elevation between the depressions. At these same places is both at one Suction flow from the direction of the one space area as well as in such from the direction of the other space area particularly given the risk of deposits. This danger is minimized by the elevated areas at the end of the hill. In addition, the butterfly shape means that the slope widens towards the ends of its longitudinal extent, so that on this very wide surface the possibility of deposits is reduced. In particular, depositing particles, insofar as they do not slip through the gradient of the recesses to one of the deep regions, are detected and transported away by one or the other suction flow.

In order to further reduce the risk of deposits, it is provided that the container bottom on both sides of the hill drops from each point in the direction of the respective depression. This means that beyond the elevation between each point of the ground surface and the low region lying on this side of the elevation is a gradient, so that the solid particles already slip due to their own weight to the lowest point and can be sucked from there. Furthermore, it is completely avoided that the container bottom dead zones, i. Has areas of lack of flow in which sediment would settle. Consequently, in this embodiment there is no planar area on the container bottom. Inner edges are ideally formed by inner curves that guide the flow and thus do not form a deposit for sediment.

According to an advantageous embodiment variant, the extension has bulges in the radial direction which are formed by sections of the container wall of the extension which extend around the space regions. The space areas from which is sucked, thus at least partially protected in these bulges. This causes a directed suction flow to develop in the direction of the main collecting space.

Preferably, the bulges are part-circular cylindrical, so that the sections of the container wall extend arcuately around the space regions, in particular around the mounting surface. There are thus no corners and kinks in the container wall, whereby no flow-calmed corners bottom side of the container wall exist in which deposits could form. Further leads the part-circular cylindrical shape of the bulges the circular suction flow, so that the hydraulic efficiency is improved. Because in the case of the wastewater from the Saugraumbereich aspirating pump set this generates in the Saugraumbereich due to the rotating impeller a vortex. The arcuate portion of the container wall around the mounting surface, ie around the suction space, thus follows this circular orbit flow, so that the container wall forms only a minimal hydraulic resistance, at least with respect to a container shape, in which two container walls lying at right angles to each other around the suction space run. Finally, the bulges have the advantage that at least a part of the room areas is protected from the respective other room area, so that in one of the room areas incoming or backflowing wastewater does not get directly into the other room area.

Preferably, the collecting container is constructed symmetrically with respect to a vertical plane, in particular by the elevation, so that the depressions lie symmetrically opposite each other and the depth ranges are at the same depth level. The two recesses may, for example, be V-shaped relative to one another. This means that the recesses extend in different directions, but from the same side away from the main collecting space and an angle between the directions of extension. As a result, a particularly compact design for the wastewater lifting plant is achieved. However, other geometries are possible.

Thus, for example, the collecting container may have two extensions on the bottom side, wherein at the end of each of the extensions there is one of the spatial regions to which one of the two elongated depressions with depth region extends at the end. For example, the second extension can lie on the side of the collecting container which faces away from the first extension, which then preferably extends in the direction opposite to the first extension. In this variant, it is then provided that each of the two extensions each having an opening with a surrounding mounting surface for mounting a pump unit or suction pipe. In this way, a substantially Z- or S-shaped course of the recesses can be realized.

The collecting container can be made of Kunstsoff, for example made of polyethylene (PE). He has a comparatively low weight. It may ideally be made by rotation sintering so that it does not have weld lines which could affect stability. Rotational sintering is known per se to a person skilled in the art.

Preferably, the container bottom has ribs formed on the underside for supporting the collecting container on a base. These have the advantage over conventional support feet to be able to absorb a large weight. The bottom surface of the container may further be formed substantially flat. The latter would be reasonably possible with support feet only if they were not hollow but solid, for example made of plastic. However, this is not possible by rotational sintering. Further, because of shrinkage effects, which are the greater the thicker the plastic, sinking in the area of the support feet would result, which in turn would absorb deposits.

Through the use of ribs, the entire container bottom can be stably supported on the ground. without causing a "sagging" of the container bottom. This danger would exist at widely spaced support feet. Due to the stability obtained by the ribs, the container bottom can also be thinner than comparable storage containers with support feet, whereby material and weight is saved.

The ribs preferably extend in the direction of the extension, ideally between lifting eyes provided on the container. This has the advantage that there is a particularly high bending stiffness in the direction from the main collecting space to the extension. This is necessary in order to avoid a breakage of the container, in particular of the container bottom, when the collecting container together with assembled pump units and possibly filled or partially filled at the lifting lugs is lifted or lowered from a shaft. If the ribs were transverse to the extension direction of the extension, there was a lack of longitudinal stabilization. There would be a risk that the sump due to the pump weight at the end of the extension and the weight of the Main storage space in the area between the main storage room and pump units breaks.

In a further development of the aforementioned embodiment variant with two spatial regions, two openings and two pump units, two solids separation tanks can furthermore be connected to the inlet, whose respective outlet side is connected to one of the pump units, so that wastewater arriving via the inlet flows through both solids separation tanks and then over both Pump units flow into the reservoir chamber, provided that none of the pump units is in operation. In the operation of one of the pump units, however, the wastewater is transported through the connected solids separation tank in the sewer. New incoming wastewater is then passed through the other solids separation tank and the second pump unit into the sump.

It should therefore be clear that the two pump units or suction pipes do not necessarily have to be in operation at the same time in order to pump about a larger amount of water per minute from the sump. Rather, the pump units or suction pipes are preferably operated alternately. For a redundancy is realized on the one hand. Thus, one pump unit can maintain the function of the lifting system if the other pump unit should be defective. The alternate pumping operation also allows wastewater to be introduced into the sump via one pump unit or suction tube while the other pump unit or siphon raises waste water from the container.

Figur 1:

Perspektivische Ansicht eines erfindungsgemäßen Abwassersammelbehälters

Figur 2:

Ansicht des Abwassersammelbehälters gemäß Figur 1 von unten

Figur 3:

Tiefenrelief im Boden Abwassersammelbehälter nach Figur 1

Figur 4a-4f:

verschiedene vertikale Querschnitte durch den Abwassersammelbehälter nach Figur 2 gemäß Schnittlinien A1-A1 bis A6-A6 quer zur Längserstreckung der Vertiefungen

Figur 5:

Perspektivische Schnittansicht durch den Abwassersammelbehälter nach Figur 2 gemäß Schnittlinie C-C in Richtung des Gefälles einer Vertiefungen

Figur 6:

Perspektivische Schnittansicht durch den Abwassersammelbehälter nach Figur 2 gemäß Schnittlinie B-B in entlang der Symmetrieebene

Figur 7:

Perspektivische Ansicht einer erfindungsgemäßen Abwasserhebeanlage mit Abwassersammelbehälter gemäß Figur 1

Further features and advantages of the collecting container according to the invention and the sewage lifting unit will be described below with reference to an embodiment. Show it:

FIG. 1:

Perspective view of a wastewater collection tank according to the invention

FIG. 2:

View of the waste water tank according to FIG. 1 from underneath

FIG. 3:

Deep relief in the bottom of the waste water tank after FIG. 1

FIGS. 4a-4f:

different vertical cross sections through the sewage tank after FIG. 2 according to section lines A1-A1 to A6-A6 transversely to the longitudinal extension of the recesses

FIG. 5:

Perspective sectional view through the sewage tank after FIG. 2 according to section line CC in the direction of the slope of a wells

FIG. 6:

Perspective sectional view through the sewage tank after FIG. 2 along section line BB in along the plane of symmetry

FIG. 7:

Perspective view of a wastewater lifting plant according to the invention with a waste water collecting tank according to FIG FIG. 1

FIG. 1 shows a waste water collection container 4 according to the invention for a sewage lifting unit 1, as exemplified in FIG. 6 is shown. The collecting container 4 has a main collecting space 11, which is extended on the bottom side to three sides. The extension 7 thus formed comprises a main wing 30 and two laterally adjacent auxiliary wings 26, the volume of space merges into one another and into the main collecting space. In an embodiment not shown, it is also possible that the main 30 and secondary wings 26 are each independent extensions, ie spatially not merge into one another or at least the container ceiling of the wings does not merge into each other. The main collecting space 11 extends like a tower from the extension. It has a substantially cylindrical container wall 12, over which the extension 7 extends on the bottom side. The side wings 26 are formed radially shorter than at the main wing lying between them 30 of the extension 7. Viewed in vertical cross section through the extension 7, the collecting container 4 is L-shaped.

The side wings 26 serve at their top for receiving a valve or an aggregate of the lifting system 1, for example, a solids separation container 3, see FIG. 6 so that no further installation space is necessary laterally next to the collecting container for these components 3, 5. Rather, these components 3, 5 can be arranged on the extension, ie in front of or next to the main collecting space 11, so that collecting container 4 and components 3 , 5 a compact Form unity. Thus, the structure of the lifting system 1 can largely be done at the factory and the installation at the site is quick and easy. In addition, the assembly of the pump units 5 on the extension 7 has the advantage that they are dry and not need to be designed as submersible pumps, whereby their structural design can be much simpler. Finally, the pump units 5 also do not necessarily have to be self-priming, because the impeller is always below the filling level when the collecting container is filled accordingly.

The radially longer trained main wing 30 of the extension 7 has at its distal end two openings 8, which are each surrounded by an annular mounting surface 10 for connecting a pump unit 5 or a suction tube. The mounting surfaces 10 are a mounting flange to which a corresponding pump flange or a pipe flange can be mounted directly. In the circumferential direction of the mounting surfaces 10 equidistantly distributed depressions in the container ceiling 20 are present in which nuts are non-positively held by force and in particular positively.

The openings 8 are formed here by way of example circular. The annular mounting surface 10 forms a circular ring. However, other geometry of the openings 8 and mounting surface 10 are possible, depending on which connection is required for a pump unit or suction pipe. For example, the annular mounting surface 10 instead of a circular ring shape have a rectangular shape, in particular a square shape.

The sewage collecting tank 4 is constructed symmetrically with respect to a vertical plane dividing the collecting tank 4 into right and left parts. The side wings 26, the openings 8 and the mounting surfaces 10 are symmetrical to this vertical plane.

The waste water collection container 4 further has lifting lugs 31, by means of which it can be lowered in its equipped with the other components and units of the lifting system state on the bottom of a shaft or sump and lifted from this again. Two such lifting lugs 31 are at the Container cover 33 of the main collecting space 11 formed symmetrically opposite, a third lifting eye 31 is formed on the upper side of the extension 7, in particular of the main wing 30 between the openings 8. Other positions or numbers are also conceivable.

In the container wall 12 of the main collecting space 11 a closable access opening 18 is provided, which allows access to the main collecting space 11 for cleaning purposes. The main collecting space 11 is bounded at the top by a container ceiling 33, in which an upwardly projecting plateau 32 of substantially rectangular cross section is formed with a mounting surface for a feed box 2, see FIG. 7 ,

The sewage tank 4 is made of plastic, here for example polyethylene (PE). As a result, it is resistant to corrosion and insensitive to chemically active wastewater. It is produced by the rotational sintering known per se, also called rotational fusion, and thus forms a monolithic body without weld lines, which can impair the structural integrity and thus cause a risk of leakage. It is therefore robust and mechanically very stable.

FIG. 2 shows the bottom 43 of the bottom 16 of the waste water collection container 4 according to the invention. At this several support ribs 22 are formed, with which the collecting container 4 is supported on a base. These have the advantage over conventional support feet to be able to absorb a large weight. Through the use of ribs, the entire container bottom can be stably supported on the ground, without causing "sagging" of the container bottom. This danger would exist at widely spaced support feet. Due to the stability obtained by the ribs, the container bottom can also be thinner than comparable storage containers with support feet, whereby material and weight is saved.

The ribs 22 extend in the central region of the collecting container 4 parallel to each other from the main collecting space 11 to the distal end of the extension 7 and the main wing 30. They lie between the lifting lugs 31 and thus reinforce the Soil stability with regard to bending stress. This prevents a breakage of the container bottom 16, when the collecting container 4 together with mounted pump units 5 and possibly filled or partially filled at the lifting lugs 31 is lifted or lowered from a shaft. Further, under the side wings 26 is in each case a rib 22 a, which extends in the direction of the respectively adjacent inner rib 22. In addition, the collecting container 4 is supported along its circumference with a rib-like peripheral edge 34 on the base surface. This peripheral edge 34 may be continuous or divided into sections as shown in FIG Fig. 2 can be seen.

FIG. 2 also shows various cutting lines. Six first cutting lines A1-A1 to A6-A6 indicate horizontal sections of the collecting container 4 at different locations transversely to the plane of symmetry of the container or to the main wing 30, which respectively in the FIGS. 4a to 4f are shown. A second section line BB runs through the plane of symmetry of the collecting container 4 and a third section line CC is displaced parallel thereto and indicates a horizontal section of the collecting container 4 along a rib 22 and through the diameter of one of the openings 8. The sectional view along the second section line BB is in FIG. 6 , the one along the third intersection CC in FIG. 5 shown.

Overall, a depth relief is formed in the container bottom 16. FIG. 3 illustrates the topography of the container bottom 39 in the representation of depth lines (contour lines for the depth). In the container bottom 16, two elongated recesses 19 are formed to the dashed ellipses for illustrative purposes FIG. 3 are drawn.

The depressions 19 each extend to a separate depression 9. They resemble a natural, shallow lake bottom, so that they have not only in the longitudinal direction but also transversely thereto, ie to the sides of a slope in the direction of a longitudinally extending base line 21. Here, the baseline 21 is the line that connects the lowest points of all cross sections through the recess 19 with each other. To the sides of the baseline 21, the bottom of the recess 19 increases. The container bottom 39 consequently has a gradient not only in at least one direction, in particular in the extension direction of the base line 21, but is uneven overall. The recesses 19 accordingly have a higher initial region 24 and a lower end region 23, see FIG Figures 2 and 5 , With respect to the initial region 24, the recesses 19 become deeper and deeper. To the sides of the baseline 21, the bottom of the recesses 19 and the container base 39 increases. The deep areas 9 correspond in each case to the lowest point of the container bottom 16. Incidentally, the container 4 has no low points or deep areas, in particular no hollow support feet, in which solids could be deposited.

The shape of the recesses 19 corresponds at least below a certain level in the representation as a closed contour of depth substantially the silhouette of a slipper, a kidney or a seedling. As a result, a suction flow is optimally guided through one of the depressions 19. A first depth line T1 at a first level roughly describes the outer shape of a seedling, i. correspond to a germinating seed. A second depth line T2 at a second level, which is higher than the first level, describes approximately the outer shape of a kidney or kidney bean. and a third depth line T3 at a third level, which is higher than the second level, describes approximately the outer shape of a slipper. With increasing height and in the direction of the rear wall of the main collecting space 11, the depressions 19 in the container bottom 39 thus become wider and thus act like a funnel. This bottom geometry also takes into account the laterally extended by the side wings 26 bottom area. Due to the wider initial region 24, the recesses 19 virtually aspire into the side wings of the extension 7. Conversely, this means that the depressions 19 become progressively narrower in the direction of extent downward. This has the effect that particles that precipitate in the raised area of the collecting container, are better sucked.

Between the recesses 19 is a hill 38, which clearly in the FIGS. 4a to 4f can be seen. The symmetry of the container is with respect to a vertical plane through the hill 38, so that the recesses 19 are symmetrical opposite and the depth regions 9 are at the same depth level. The recesses 19 are adjacent to each other in the length, so that the hill 38 is a substantially elongated hill 38. Starting from the main collecting space 11, the gradient of the depressions 19 runs along the Baseline 21 approximately parallel, although the baselines 21 slightly curved in itself, due to the symmetry of the bottom 39 with respect to the hill 38 are oppositely curved. In the lower part of the base lines 21 are slightly arcuate, so that one here the position of the recesses 19 to each other as "back-to-back" can designate, ie that the backs of the arches are directed to each other. Since the suction due to the hydraulic reaction of the impeller of a pump unit is a circulating flow, this geometry also has a favorable effect on the flow and amplifies the suction at the respective space area opposite end of the corresponding recess, ie on the rear wall of the main collecting space, and in particular acts also in the wings of the extension 7.

As based on FIG. 3 1, the two depressions 19 merge into one another above a certain level so that they combine to form an overall depression, the shape of which in the illustration corresponds essentially to a butterfly as a closed depth line T4. This has the effect that a suction flow along one of the depressions 19 above the said level also becomes noticeable at the bottom of the other depression 19 and entrains sedimented solid particles there.

In order to achieve a transition of the two depressions 19 above the determined level, the hill 38 has a local minimum approximately in the region of the lower third of its longitudinal extent. This is particularly in the cross-sectional view in FIG. 6 recognizable. This means that the rise 38 rises from a minimum height defining the level to the opposite end regions 23, 24 of the depressions. However, while the depressions 19 drop toward the deep regions 9, this means that the height difference between the baseline 21 and a crest line connecting all crests of the rise 38 becomes ever greater. As a result, the gradient from the rise 38 to the bottom of the depressions 9 also increases, the closer the rise 38 is located to the depression areas 9, so that in the area between the two depression areas 9 there is a greater gradient from the rise 38 in the direction of the depression areas 9, as the hill 38 has in its remaining area to the baseline 21 of the recesses 19. This is due to the fact that the bottom area in the container 4 between the two deep areas 9, from which is sucked off, forms a region with a smoother flow than otherwise present on the rise 38. The increased slope also reduces the risk of deposits. The aforementioned level above which the two recesses 38 merge into one another corresponds to the said minimum height of the hill.

In order to further reduce the risk of deposits, the container bottom 39 drops on both sides of the hill 38 from each point in the direction of the respective depression 9. This means that beyond the rise 38 between each point of the bottom surface and the low region lying on this side of the hill 38 is a gradient, so that the solid particles already slip due to their own weight to the lowest point and can be sucked from there. Furthermore, it is completely avoided that the container bottom dead zones, i. Area of lack of flow in which sediment would settle. Consequently, in this embodiment there is no planar area at the container bottom 39 at any point. Inner edges are formed by inner curves which guide the flow and thus do not form a deposit possibility for sediment.

Above the deep regions 9 is in each case a spatial region 14, from which the wastewater is sucked out of the container 4 during operation of the lifting plant 1. The two space regions 14 thus form suction areas. The deep areas 9 and the overlying room areas 14 are in FIG. 4a recognizable, which shows a vertical section through the extension 7 in the region of the two deep regions 9 along section line A1-A1. On both sides of the deep regions 9 transversely to the longitudinal extension of the recesses 19 of the ground 39 increases. The transition of the container bottom 16 to the side walls of the extension 7 lying laterally of the recesses 19 and a line connecting all the vertices 29 of the ledge 38 can each be considered as a shoreline. The distance of the baseline 21 with respect to these shorelines becomes larger and larger as the depressions 19 advance toward the respective depression region 9, so that the container bottom 16 is highest below the shore lines, ie at the edge sides and in the middle, ie the underside of the container bottom 16 the farthest spaced from the footprint of the container 4, as in FIG. 4a becomes clear. In contrast, the container bottom is 16 on its underside in the region of the deep areas 9 on the footprint of the collecting container 4.

How to get by FIG. 2 recognizes the basic shape of the container bottom 16 is substantially shell-shaped, wherein the head of the shell (eg a scallop, cockle) is extended to form the main wing 30 of the extension 7. The extension 7 furthermore has two part-circular cylindrical bulges 40 in the radial direction, which are each formed by a section 15 of the container wall 28 of the extension 7 which extends in an arcuate manner around a space region 14. Between the sections 15 is a connecting portion 27 which is also arcuate, but is directed with its back to the container interior. The space regions 14, from which is sucked, are thus at least partially protected in the bulges 40 a. This causes a directed suction flow can develop in the direction of the main collecting space 11. Further, the part-circular cylindrical shape of the protrusions 40 guides the circular suction flow, so that the hydraulic efficiency is improved. Because in the case of a wastewater from the Saugraumbereich 14 suction pump unit 5 this generates in the suction chamber 14 due to the rotating impeller a vortex. The arcuate portion 15 of the container wall 28 around the mounting surface 10, ie around the suction space area 14, thus follows this circular orbit flow, so that the container wall 28 forms only a minimal hydraulic resistance, at least with respect to a container shape in which two are at right angles to each other lying container walls extend around the suction chamber 14. Finally, the bulges have the advantage that at least a part of the space regions 14 is protected from the respective other space region 14, so that in one of the spatial areas incoming or backflowing wastewater does not reach directly into the other space region 14.

As based on FIG. 5 can be seen, is the lowest point 9 below the opening 8. Thus, also lies in the opening 8 or extending through this opening suction port of a pump unit 5, or the mouth region of a suction pipe, directly above a low region 9 so that the wastewater can be sucked directly from the container bottom 39. To this In this way optimal container emptying is achieved by deep suction. Like from the Figures 3 and 4a to 4f shows, the elongated recesses 19 each form a kind of shallow brook bed, whereby a suction flow is well managed and deposits are entrained in lifting the collected wastewater. This achieves an automatic cleaning effect.

The collecting container 4 according to the invention is intended for a sewage lifting plant 1 with two pump units 5, which suck wastewater from each one of the space regions 14. For this purpose, the two openings 8 are arranged above the space regions 14, see FIG. 4a , In each case a pump unit 5 or a suction pipe can be mounted here to the collecting container 4.

The elongate depressions are thus each directed to a separate suction area, so that the main flow in the container 4 during a pumping process along the recess 14 extends. As a result, an automatic cleaning effect along the recesses 19 is achieved. The container bottom geometry according to the invention prevents a flow-calmed or even flow-dead zone from forming on the container bottom 39 between the two spatial regions 14 / suction regions and in the intermediate region along the two depressions 19.

Due to the elongated extent of the depressions 19 with a gradient falling due to their own weight to the ground solid particles are largely directed in the direction of the gradient and thereby guided quasi. Characterized in that the wells 19 each lead into a separate deep area 9 instead of a common low level at the foot of the gradient, the solid particles sedimented within one of the wells 19 can be better detected by the suction when lifting the waste water from the direction of the corresponding space region 14 and entrained with the flow be, as they accumulate in the wastewater specifically at the bottom of the respective space area 14.

The slope along the respective baseline 21 of the recesses 19 is not constant. Rather, it increases towards the respective low region 9. Be reversed the recesses 19 in the direction of the main collecting space 11 consequently flatter. This is clear in comparison of the FIG. 4d to Figure 4e and compared to this too FIG. 4f to recognize. The fact that the container bottom rises starting from the deep regions 9 to the main collecting space 11, can be seen by comparing the lowest points of the container bottom 39 in the respective cross section of FIGS. 4c, 4d . 4e and 4f together. In FIG. 4d , which shows a section along the section line A4-A4, is a clear distance between the bottom of the container bottom 16 and the footprint of the container 4. This distance is in Figure 4e bigger and in FIG. 4f even bigger.

The gradient of the recesses 19 may be less than 16 ° in the longitudinal direction of the deep regions 9, for example. This small gradient is sufficient to absorb sedimented sediment with the flow or entrain. On the other hand, this achieves the result that, despite the increase in the floor area on one side, the collecting container does not have to be structurally much higher and at the same time a large container volume remains.

The slope of the container bottom 39 in the direction of the main collecting space 11 is particularly important in view of the fact that wastewater containing solid particles from the suction can flow into the collection or intended, even flows. The former is the case when the conveying pump unit 5 is turned off and the sewer column from the outgoing pipes 6, 13 flows back. The latter is the case when the filling of the collecting tank via the pump units takes place. In both cases, the solid particles flush the wells "high". Due to the slope is prevented or at least minimized that heavy particles are washed up the slope.

Overall, the relief according to the invention of the bottom substrate 39 improves the flow within the container 4 by the respective recess 19 acts as a streambed while sucking the wastewater from the located at its end space portion 14. This promotes the absorption of settled particles from the bottom 39 in the suction flow and optimizes the self-cleaning effect when lifting the wastewater.

The hill 38 between the two recesses 19 is mainly in the Figures 4c and 4d clearly visible. It has the shape of a shallow hilltop and is viewed in cross-section in height as shallow as the depressions in depth, so that the container bottom 16 in cross-section approximately has an elongated sinusoidal shape. The vertex 29 of the hill 38 is located in the vertical sectional plane along section BB in FIG. 2 , By the hill 38 permanent deposits between the wells 19 are avoided. Particles either slip by themselves to the baseline 21 of one of the depressions 19 and ideally further to their depth region 9 or are entrained due to the exposed position both during operation of the one and the other pump unit 5.

FIG. 5 shows the waste water collection 4 cut in perspective view, wherein the section along the section line CC in FIG. 2 runs and the view is free in one half of the extension 7. The section runs along a support rib 22, by means of which the height becoming smaller can be seen, as the container bottom 39 drops into the main wing 30 of the extension 7, ie, in the direction of the space region 14.

The thickness of the container bottom is approx. 15mm. In contrast, the rib height decreases to the distal end of the extension 7, ie with increasing distance from the main collecting space 11. There, where the lowest point 9 of the recess 19, the rib 22 has the height zero is therefore no longer present. Here, the container bottom 16 touches the footprint on which the sump stands, as shown in FIG FIGS. 4a, 4b is apparent.

FIG. 6 shows the waste water collection container 4 cut in side view, wherein the section along the section line BB in FIG. 2 , ie the plane of symmetry runs and the view into the main collecting space 11 and part of the extension 7 is free.

The underside of the container cover 20 of the extension 7 has a slope towards the main collecting space towards the top. This ensures that floating in the expansion of floating oils and fats along the container ceiling in the direction of the main collecting space 11 and ultimately there into it lead. Thus, the risk of their sticking to the container cover 20 of the extension is minimized. The slope has a tilt angle between 3 ° and 8 °. This is sufficient to ensure an increase of the oils and fats in the main collecting space 11 and lends the collecting container 4 nachwievor a compact design, so that other components of the lifting system 1 can be mounted on the extension 7.

The thickness of the container cover 20 in the region of the extension 7 is substantially constant. As a result, the upper surface 25 of the container cover 20 is also inclined, i. falls to the distal end of the extension 7. This avoids that water, such as rainwater, accumulates on the extension 7, and becomes a danger of slipping for a person who must perform maintenance on the sewage lifting unit 1. To reduce this risk even further, the container top of the extension can have a non-slip, especially rough surface, which ensures a firm grip under the feet when climbing the extension.

A slope is also present in the mounting surfaces 10, which are formed in the container ceiling 20. As a result, a pump unit 5 mounted at right angles on one of the mounting surfaces 10 is not vertical but is tilted in the direction of the gradient. As FIG. 5 clarified and also in the FIGS. 4a and 4b can be seen, the mounting surfaces 10 are located slightly lower relative to the top 25 of the container ceiling. This facilitates assembly, since the pump units 5 are with their pump flange in a -wenn even low-form fit to the container ceiling and thus can not slip away. Furthermore, this shows that the slope in the container ceiling and mounting surface not identical, especially not at the same time must be present. Thus, in one embodiment, a horizontally extending upper side 25 of the extension 7 and in this upper side 25 an inclined mounting surface 10 can be realized. According to another embodiment, the top 25 of the extension 7 may have a slope, whereas, however, the mounting surface 10 is horizontal.

In the embodiment in the figures, the slope of the mounting surfaces 10 is independent of the slope of the top 25 and is between 2 and 4 ° relative to the horizontal plane. Now a pump unit 5 as in FIG. 7 Recognizable positioned such that the pressure-side outlet 42 of the pump chamber is higher than the rest of the pump chamber, on the one hand automatic ventilation of the pump unit 5 and its area in front of the suction mouth and the pressure line 6 is achieved behind the pump chamber, on the other hand, there is a gradient in the pressure line 6 in the direction of the pump chamber, which favors the inflow of waste water via the pressure side of the pump, provided that the lifting system is adapted to discharge the waste water via the pressure line of the pump unit into the collecting chamber 4.

The in the FIGS. 1 to 6 shown collecting container 4 is intended for a sewage lifting unit 1 with two pump units 5 suitable to suck the wastewater from each a separate room area 14, ie for lifting systems 1 with two suction areas.

FIG. 7 shows an exemplary Abwasserhebeanlage 1 with a wastewater collection tank according to the invention 4. The lifting system 1 is symmetrical and includes in addition to the collection 4 an inlet port 17, which opens into a feed box 2, a solids separation system 3 and two pump units 5. It is set up as a redundant double pump system with dry Pumps performed thereby ensuring maximum ease of maintenance and operational safety. The pump units are equipped with the same performance, so that a pump unit can completely replace the other pump unit, at least temporarily. The normal operation of the two pump units takes place alternately, ie that either one pump unit or the other pump unit go into operation.

The pump units 5 consist of a pump unit and an electric motor drive unit. The drive shaft of the drive unit is, apart from the tendency explained below, substantially perpendicular. The pump unit includes one in a pump housing 41 arranged pump chamber in which an impeller driven by the drive unit is rotatably mounted. wherein the pump housing 41 has an inlet in the axial direction in the pump chamber and an outlet 42 in the radial direction from the pump chamber. The pump unit is thus formed by the radial type and the drive unit as a dry runner.

By using the solids separation system 3, the pumps 5 do not come into contact with the coarse solids. This allows pumps with optimized efficiencies to be used for transporting the wastewater. Furthermore, the sewage lifting plant 1 by the solids separation system 3 is not susceptible to clogging.

The inlet box 2 is mounted on top of the plateau-like projection 32 of the sewage collecting tank 4. From the two sides of the inlet box 2, two feed pipes 35 each extend to a solids separation tank 3, which stand laterally next to the main collecting space 11 on the side wings 26 of the extension 7. From each of the solids separation tank 3, a pipe connection 6 extends to the outlet 42 of one of the pump units 5. These are each mounted on one of the mounting surfaces 10 of the extension 7 of the collecting container 4, so that the suction port of the respective pump 5 is located above one of the space regions 14. Each of the solids separation tanks 3 further comprises a riser 36, which merges into a central pressure line 13, which in turn is in communication with the sewer.

The solids separation tank 3 are cylindrical. The feed pipes 35 open in the axial direction from above into the respective solids separation tank 3. The pipe connections 6 to the respective pump 5 are connected in the radial direction at the axial end of the solids separation tank 3 opposite the feed pipe 35. Also at this axial end, but on the opposite to the pipe joint 6 back of the solids separation vessel 3, the riser 36 is connected to the solids separation vessel 3 and extends upwards, in particular vertically. Both risers 36 unite above the inlet box 2 approximately in the middle of the sewage lifting unit 1 to the central pressure line 13. There are shut-off valves 37 in the risers 36 are present can interrupt the connection of the respective riser 36 to the pressure line 13.

The operation of the wastewater lifting plant 1 is as follows. The unfiltered wastewater flows via the wastewater inlet 17 from behind into the inlet box 2 and is divided here into the left and right part of the plant. It then flows through the solids separation tank 3, which retain the coarse solids in the wastewater, to the pump units 5 and enter via the pressure-side outlet 42, in the off state of the respective pump 5, via the corresponding opening 8 in the extension 7 into the sump 4 , The prefiltered wastewater is accumulated in the reservoir 4 until it is completely filled up to a defined level, for example, to below the inlet box 2.

If a certain filling state is reached, one of the pumps 5 is activated. The collected water is then lifted from the sump 4 and pressed by the pipe connection 6 from the pump 5 into the connected solids separation vessel 3. Due to the resulting overpressure, a one-way valve in the inlet to the solids separation vessel 3 is automatically closed. The pumped waste water flushes the solids collected in the solids separation tank 3 through a second opening in the rear region of the solids separation tank 3 into the riser 36 and further into the pressure pipe 13 and further up into the pressure-side piping network. Thus, an automatic cleaning effect in the solids separation tank 3 is achieved when lifting the wastewater. The other pump 5 remains disabled during operation of a pump 5, so that the collecting tank 4 can be supplied during the sewage lifting new wastewater.

It can be seen that there is no direct feed connection from the solids separation tank 3 to the collection tank 4. This has the advantage that no additional valve is needed that would have to be arranged in the connection between solids separation tank 3 and collection tank 4. Such a valve would close operation of one of the pump units 5, since otherwise the vacuum exerted by the pump unit 5, the solids separation vessel. 3 could cause damage and, if the treated effluent is passed over the solids separation vessel for purge purposes, no wastewater is circulated.

By using a solids separation system here in the form of the two solids separation tank 3, a pre-cleaning of the waste water takes place, whereby inflow and removal of the filtered wastewater can take place via the same opening 8 in the sump 4, which is located under the pump 5. This opening 8 thus forms a combined inlet / outlet opening. There is no need to provide a separate opening in the collecting container 4 for the inflow of the wastewater. This reduces the risk of leakage. In contrast, without filtering no use of Abpumpweges for the wastewater inlet into the sump 4 would be possible. Because coarse solids in the wastewater to be collected, the hydraulics of the pump 5 could not happen. Conversely, this is the case because the pumps suck 5 in operation and make a crushing of the solids. In particular, the pumps 5 for this purpose, for example, have wheels with cutting units.

Characterized in that the waste water flows through one and the same openings 8 in the collecting container 4 and is pumped, the elongated recesses 19 are flowed through in both directions. In the emptying phase in the descending direction, in the inflow phase in the ascending direction. When you start to collect heavy solids that can still pass through the filter 3, directly under the pump 5, because there is the lowest point 9 of the container to which there is a gradient from all sides. In the emptying phase, the solids are then entrained by the forming in the respective recess 19 flow and transported by the active pump 5 in the pressure pipe 13. As a result, a cleaning effect is achieved with each pumping operation, which allows longer maintenance intervals.

Of particular importance is also that the longitudinal axis of the pump units 5 is tilted relative to the vertical between 2 ° and 4 °. This is achieved by an oblique design of the mounting surfaces 10, on which the pump units 5 are mounted. Viewed in a radial section through the pump chamber, this leaves one half of the pump chamber higher and the other half lower than one the mounting surfaces 10 centrally intersecting horizontal plane. The angular orientation of the pump unit is now such that the outlet 42 is located in the higher part of the pump chamber, in particular at the highest point. The outlet direction is thus directed obliquely upwards. This arrangement has the advantage that the pump chamber is vented via its outlet 42. Because in the pump chamber collecting air flows to the higher part of the pump chamber, where the outlet 42 is located. Thus, it is ensured that no large volume of air can accumulate in the pump chamber and the pump chamber is always completely filled with water. As a result of the slightly upwardly directed outlet 42, the pipe joint 6 follows this course. In other words, the pipe joint 6 in the direction of the respective pump unit 5 has a gradient. Since the pipe joint 6 is used as a feed for the filtered wastewater, the flow rate in the pipe joint 6 is increased and the risk of clogging is reduced.

LIST OF REFERENCE NUMBERS

1.

Sewage lifting unit

Second

feedbox

Third

Solids separation reservoir

4th

Clippings

5th

pump unit

6th

pipe connection

7th

extension

8th.

opening

9th

depth range

10th

mounting surface

11th

Main collection chamber

12th

Container wall of the main collection room

13th

pressure line

14th

Room area, suction area

15th

Outer arcing section of the container wall of the extension

16th

container bottom

17th

waste water supply

18th

inspection opening

19th

deepening

20th

vessel top

21st

baseline

22. / 22a

supporting rib

23rd

end

24th

initial region

25th

Top of the tank ceiling

26th

wing

27th

Inner arch section of the container wall of the extension

28th

Side wall

29th

vertex

30th

main wing

31st

Lifting eyes

32nd

plateau-like projection

33rd

Ceiling of the main collection room

34th

peripheral edge

35th

feed

36th

riser

37th

shut-off valve

38th

hill

39th

container base

40th

bulges

41st

pump housing

42nd

pump outlet

43rd

Bottom of the container

Claims (25)

Wastewater lifting plant (1) comprising a collecting tank (4) for waste water and at least one pump unit (5) for pumping the waste water from the collecting tank, wherein the pump unit (5) has a pump housing (42) with an inlet in the axial direction into a pump chamber receiving an impeller and an outlet (43) in the radial direction from the pump chamber, and the collecting container (4) has a substantially cylindrical main collecting space (11) with a bottom extension (7), the extension (7) having at least one opening above which the extension (7) carries the pump unit (5) and below which a space region (14) is located, from which the wastewater is sucked out of the collecting container during operation of the pump unit (5), characterized in that the longitudinal axis of the pump unit (5) opposite the vertical is tilted and the outlet (43) in the higher part of the pump housing (42). Sewage lifting plant (1) according to claim 1, characterized in that the outlet forms the highest point of the pump housing. Wastewater lifting plant (1) according to claim 1 or 2, characterized in that the longitudinal axis is tilted between 5 ° and 10 °. Sewage lifting plant according to one of the preceding claims, characterized in that it comprises at least one connected to an inlet (17) solids separation vessel (3) which is connected to the outlet side of the pump unit (5), so that on the inlet (17) incoming wastewater through the solids separation vessel (3) and then flows via the pump unit (5) in its disconnected state into the collecting container (4). Sewage lifting plant (1) according to one of the preceding claims, characterized in that it comprises two pump units (5) and the extension (7) has two openings, above which the extension (7) in each case one of the pump unit (5) carries and below which each a space regions (14) is located, from which in the operation of the respective pump unit (5) wastewater is sucked, and wherein the longitudinal axes of both the pump unit (5) are tilted relative to the vertical and the outlet of both pump units (5) respectively in the higher part of the respective pump housing lie. Wastewater lifting plant (1) according to one of the preceding claims, characterized in that the opening (8) or openings (8) by an annular mounting surface (10) for mounting a pump unit (12) or a suction tube is surrounded / are. Sewage lifting plant (1) according to claim 6, characterized in that the mounting surface (10) or mounting surfaces (10) lies / lie in a plane which is tilted relative to a horizontal plane, in particular tilted away in the direction of the main collecting space. Sewage lifting plant (1) according to one of the preceding claims, characterized in that the underside (21) of the container cover (20) of the extension (7) at least partially has a slope in the direction of the main collecting space (11) towards the top. Wastewater lifting plant (1) according to claim 8, characterized in that the slope has an angle of inclination between 3 ° and 8 °. Sewage lifting plant (1) according to one of the preceding claims, characterized in that the upper side (22) of the container ceiling (20) of the extension (7) at least in sections, a slope in the direction of the main collecting space (11) away. Sewage lifting plant (1) according to one of the preceding claims, characterized in that in the container bottom (16) at least one elongated Recess (19) is formed, which drops in the direction of the space region (14), where it forms a deep region (9) of the container bottom (16) in the rear region of the extension (19). Wastewater lifting plant (1) according to one of claims 5 to 11, characterized in that in the container bottom (16) two elongated recesses (19) are formed, each sloping to their own deep area (9) in the rear region of the extension (7) extend and between the wells (19) is a rise (38), wherein over the deep areas (9) each have a space area (14) for the intended suction of the waste water. Sewage lifting plant (1) according to claim 12, characterized in that the two deep regions (9) respectively correspond to the lowest point of the container bottom (16). Wastewater lifting plant (1) according to claim 12 or 13, characterized in that the shape of the recesses (19) corresponds at least below a certain level in the representation as a closed contour line substantially a slipper, a kidney or a seedling. Sewage lifting plant (1) according to claim 14, characterized in that the depressions (19) are "back-to-back". Wastewater lifting plant (1) according to one of claims 12 to 15, characterized in that the recesses (19) pass over one another above a certain level. Sewage lifting plant (1) according to any one of claims 12 to 16, characterized in that the rise (38), starting from a minimum height to both end regions of the recesses (19) increases towards. Sewage lifting plant (1) according to any one of claims 16 or 17, characterized in that the recesses (19) above the level or the minimum height combine to form an overall recess whose shape in the Representation as a closed contour of depth essentially corresponds to a butterfly. Sewage lifting plant (1) according to one of claims 12 to 18, characterized in that the container bottom (16) on both sides of the hill (38) from each point in the direction of the respective low region (9) drops. Sewage lifting plant (1) according to any one of claims 12 to 19, characterized in that the slope of the recesses (19) is less than 16 °. Sewage lifting plant (1) according to any one of claims 12 to 20, characterized in that the extension (7) part-circular cylindrical bulges (40) in the radial direction, which by arcuately around the space regions (14) around extending portions (15) of the container wall of Extension (7) are formed. Wastewater lifting plant (1) according to one of claims 12 to 21, characterized in that the collecting container (2) is constructed symmetrically with respect to a through the hill (38) extending vertical plane. Sewage lifting plant (1) according to one of the preceding claims, characterized in that the collecting container (2) made of Kunstsoff, in particular by Rotationsssintem is made. Sewage lifting plant (1) according to one of the preceding claims, characterized in that the container bottom (16) has ribs (22) formed on the underside for supporting the collecting container (4) on a base. Wastewater lifting plant (1) according to claim 24, characterized in that the ribs (22) extend in the direction of the extension (7).

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