EP3791028A1

EP3791028A1 - Wastewater-lifting system

Info

Publication number: EP3791028A1
Application number: EP19723743.1A
Authority: EP
Inventors: Jürgen GEINITZ; Michael Becker
Original assignee: KSB SE and Co KGaA
Current assignee: KSB SE and Co KGaA
Priority date: 2018-05-09
Filing date: 2019-05-07
Publication date: 2021-03-17
Anticipated expiration: 2039-05-07
Also published as: HRP20231162T1; CN112135947A; US20210071406A1; CA3098605A1; WO2019215124A1; EP3791028C0; CN112135947B; EP3791028B1; DE102018207243A1

Abstract

Wastewater-lifting system which comprises at least one bulky material collection tank (4) with at least one separating screen (12), arranged in its interior, for wastewater loaded with bulky materials that is to be guided therethrough, and with at least one pump (6) which is arranged downstream of the bulky material collection tank (4) and which is connected to the bulky material collection tank (4) via at least one connection line (5), wherein the separating screen (12) can be selectively removed from and reinserted into the bulky material collection tank (4) through a closable opening in the latter, wherein the bulky material collection tank (4) is designed with an inner guide (20) for the separating screen (12) which can be plugged therein and can be pulled out again, wherein both the plugging and the pulling operation of the separating screen (12) occurs in a predominantly vertical manner.

Description

Sewage lifting unit

The invention relates to a wastewater lifting plant, comprising at least one bulk collecting tank with at least one separating sieve arranged therein for wastewater contaminated with blocking substances, and at least one downstream of the bulky waste collecting tank, which has at least one connecting line with the Bulk-collecting container is connected, wherein the dividing screen is formed by a closable opening in the bulk material collecting container either removable from this and reusable in this. Wastewater lifting plants are usually used to raise the end of a Abwasserstaurau with collected wastewater to a certain level. In order to keep coarse solids or solids in the wastewater away from the at least one pump, the bulk material collecting container is provided. Here, the solids are separated from the pumped liquid or the wastewater before the freed of the solids pumped medium enters the pump. For the separation of the solids from the pumped liquid arranged in the interior of the bulk material collection container provides separation screen.

Ideally, the blocking substances remain in this process in the bulk material collecting container, so that only in this way pre-cleaned wastewater is transferred to a liquid collecting tank downstream of the bulk material collecting container. In this case, the pre-treated wastewater flows through the pump downstream of the bulk material collecting container and subsequently enters the liquid collecting container. The The basic mode of operation of such a wastewater lifting plant is described, for example, in EP 1 108 822 B1.

EP 2 581 508 B1 relates to a comparable sewage lifting plant which is equipped with a filter device outside the housing for the liquid collecting container or outside this liquid collecting container. The fil tervorrichtung has a filter box, which has a closable opening and is placed in front of the pump. In detail, the filter device has a sieve unit which is exchangeable and is formed by a plurality of strips formed in the manner of a comb with gaps and teeth. As a result, the screen unit can basically be removed and, for example, cleaned or replaced. However, the metal strips used at this point are relatively fragile. Although they allow a change in the filter properties of the screen unit. However, damage to the strips in question both during operation and during installation and removal are possible and can not be excluded.

In the generic state of the art according to DE 20 2008 011 273 U1, the local bulk material collecting container is equipped with a shut-off / screening device as a unit consisting of a shut-off flap and a sieve, which can also work or work as a separating sieve. The shut-off / screening device, together with a closure flange of the bulk material collecting container, forms a structural unit and can be removed from the bulk material collecting container in question and replaced in it. Such an approach has proven itself in principle. However, the installation and removal of said assembly is not without problems, because to the end flange must be coupled from the side with the bulk material collection container and screwed. In view of the often observed at this point considerable weight of 50 kg and more, this may cause problems, especially since additional flange holes must be made in each case cover. Finally, the prior art knows a screening device for a wastewater lifting plant, as described in EP 2 966 231 A1. The screening device and the bulk material collecting container are altogether outside a collecting container or liquid collecting container and thus designed freely accessible. The sieve device comprises at least one module which has an outer frame. Within the outer frame, a plurality of spaced-apart, alternately long and short pins extend from its circumference to the center of the outer frame. The pins are inclined in the direction of the flow generated when emptying the sump deviating from the vertical direction of the flow.

In addition, the screening device forms an independent component which is detachably connected to the wastewater lifting plant. The installation and removal of the screening device takes place here again from the side, that is, for example, from the right into an associated housing. This is at a high weight of the screening device comparable to the previously described prior art according to DE 20 2008 011 273 U1 disadvantageous. The invention is based on the technical problem of such a Abwasserhebean position develop so that the dividing screen is easy and little effort accessible.

To solve this technical problem, the invention proposes in a gatmentungsgemäßen sewage lifting system that the bulk material collecting container is formed with an inside guide and in particular a linear guide for herein einsteck bare and retractable separating screen, both the plug and the drawing process the separation screen is mostly vertical. According to an advantageous embodiment, the separating screen is arranged on an insertion frame interacting with the guide. Consequently, the dividing screen can be easily inserted and pulled out again via the slide-in frame into the inside guide provided in the bulk material collecting container and, in particular, the linear guide, and this can be withdrawn predominantly vertically. In this way, initially a simple installation and removal of the separation screen is provided. This applies in particular to the case where the plug and pull passage of the separating sieve or of the insertion frame carrying the separating sieve predominantly vertically, that is to say in the direction of gravity or opposite thereto. As a result, additional gravitational forces can be used in a simple and problem-free manner, in particular when installing the separating sieve, because the separating sieve, including the insertion frame in the gravitational direction, is inserted into the inside guide provided on the inside in the bulky substance collecting container.

When pulling out of the separating screen and the associated insertion frame must indeed be worked against gravity. However, the drawing process is performed as well as the mating process with the help of the guide, so that tilting or damage to the separating wire in both processes in contrast to the prior art, for example according to EP 2 581 508 B1 avoided in any case. In addition, the guide or linear guide makes the alignment of any flanges or mounting openings unnecessary to one another, as is required in the further prior art according to DE 20 2008 011 273 U1. In EP 2 966 231 A1, a relatively complicated assembly is also observed. All this leads to the fact that the installation and removal of the separation screen in contrast to the present invention is particularly simple, functional and fast and can also be done.

A further factor contributing to this is the fact that, during installation and removal, work is predominantly carried out in the gravitational direction or against the gravitational direction, so that, if required, proven hoists can be used without force deflections or the like being required. Here are the main benefits.

The advantages and effects of the invention already described above are already apparent in the case in which the bulk substance collecting container is basically arranged inside the liquid collecting container, as is predominantly disclosed in EP 2 581 508 B1 is shown and described. As a rule, however, the bulk material collecting container (as well as the pump) is arranged outside the liquid collecting container, comparable as described and emphasized in EP 2 966 231 A1. In contrast to this, the invention makes use of a linear guide running in the bulk material collecting container in a direction perpendicular or predominantly in the direction of gravity, whereas an exchange is possible in the case of the previously mentioned and known teaching, but in such a way that the sieving device there again depends on the side is inserted and pulled out. In EP 2 581 508 B1, although a predominantly vertical movement of the separating screen is observed, but unguided, so that in this process damage to the strips of the filter used are possible.

According to an advantageous embodiment of the dividing screen-carrying insertion frame and the guide in front view are U-shaped. In fact, the design is such that the respective U-shape with the associated U-legs predominantly perpendicular or runs in the direction of gravity.

In order to facilitate the installation even further, the separating screen, the guide and the insertion frame are generally arranged in a box housing part of an otherwise tubular housing of the bulk material collecting container. The box body part is advantageously equipped with the top opening for the separation screen. It has proven particularly useful if the opening is rectangular. Because this can be worked on the whole flange with an associated rectangular closure. It is even possible that this sealing flange will be equipped with a quick-release fastener.

In any case, the generally predominantly tubular housing of the bulk material collecting container is designed, as a rule, at least in the manner of a box in the region of the separating sieve and consequently of the guide and the insertion frame. Because in this area, the box housing part of the otherwise tubular housing of the bulk material collection container is realized. As a rule, the box-like design or the box housing part has a base adapted to the pipe shape and two side walls running parallel to one another, so that this results in a U-shaped cross section of the box housing part with the top-side closure flange. Consequently, the opening of the box body part is formed rectangular. Also, the closure flange has an associated and the opening occlusive rectangular shape. The closure flange can also be designed round or oval.

According to another advantageous embodiment with particular importance of the drawer frame is connected to the closure flange. As a result, not only the separating screen is aligned directly with an installation of the separating screen and an associated plugging operation of the insertion frame in the inside guide, but also the connected to the insertion frame closure flange relative to the opening. Consequently, the installation and removal of the separating sieve are particularly simple and inexpensive, which is why any maintenance and cleaning work can be carried out particularly quickly and easily.

In addition to the dividing screen, the slide-in frame also generally carries a butterfly valve. The butterfly valve is generally connected to the slide-in frame via a joint. With the help of the butterfly valve, an opening in the drawer frame can at least be closed so far that a wastewater flow only passes through the separating sieve. In fact, the dividing screen is advantageously and essentially composed of a plurality of webs arranged at the edge edge of said opening in the insertion frame and spaced apart from one another. The design may be selected to be comparable to that in the previously mentioned reference DE 20 2008 011 273 U1.

As a result, a wastewater lifting plant is made available, which enables easy maintenance and cleaning of the separating sieve, without the risk of damaging the separating sieve during installation and removal. In addition, the installation and removal is particularly simple and accurate, because this only a guided plug as well as a drawing process is required in the invention. any Canting or damage is thereby excluded. In addition, the installation and removal is much easier. Here are the main benefits.

In the following, the invention will be explained in more detail with reference to a drawing showing only one exemplary embodiment; show it:

Fig. 1 is a wastewater lifting plant according to the invention in a perspective

Overview and Fig. 2 is a schematic longitudinal section through the bulk material collecting container as part of the sewage lifting unit of FIG .. 1

In the figures, a wastewater lifting plant is shown. This first of all has an inlet 1 for waste water, which via a feed distributor 2 via a supply line 3, the wastewater in the embodiment in each case into two bulk material collecting container 4 transferred. In the context of the embodiment, the wastewater lifting plant is designed symmetrically and has two bulk material collecting container 4 and additionally two discharges or connecting lines 5, via which the wastewater pre-cleaned with the aid of the bulk material collecting container 4 into an associated pump 6 reached.

The bulk material collecting container 4 or the two bulk material collecting containers 4 respectively ensure that the wastewater flowing in total via the inlet 1 and the inlet distributor 2 and contaminated with solids is freed from the blocking substances or solids present in the associated bulk material collecting container 4 remain. The pre-cleaned wastewater in this way then passes through the discharge line 5 into the pump 6 or via a bypass 7 directly into a liquid collecting tank 8. The pre-purified waste water flowing through the respective pump 6 also passes through a discharge line 9 into the liquid collecting tank 8 For this purpose, the inflow of the wastewater corresponds. During a pumping or lifting process, the prepurified wastewater from the liquid collecting container 8 is now sucked in via the discharge line 9 in each case from the pump 6 and forced through the discharge line or connecting lines 5 into the bulking agent collecting container 4. In this case, the pre-treated wastewater takes along the solids retained in the bulky waste collecting tank 4 and transfers the wastewater via a pressure line 11 to a further plant or, generally, a further treatment. In this way, the blocking substances are released from the bulk material collecting container 4 and flushed into the pressure line 11 virtually without resistance in the subsequent pumping operation. For the following considerations and invention details, the design and function, in particular the bulk material collection container 4 is important.

2, a longitudinal section of the bulk material collecting container 4 is shown. It can be seen first of all corresponding connection flanges on the one hand to the supply line 3 and on the other hand to the pressure line 11. In addition, one recognizes the batch or the bypass line 7. This also applies to the connection line. 5

The decisive factor is the fact that the bulk material collecting container 4 is initially equipped with a separating sieve 12 arranged in its interior. Through the separating screen 12, the polluted wastewater wastewater is passed. In fact, the wastewater, starting from the feed 1 via the feed distributor 2 and the feed line 3, finally flows into the bulk material collecting container 4. From there, the wastewater flows through the separating sieve 12. The separation screen 12 ensures in this process that the solids are retained in the bulk material collecting container 4. For this purpose, a shut-off flap 13 is assigned to the separating sieve 12 according to the exemplary embodiment. The shut-off valve 13 ensures that an opening 14 in a Einschubrah men 15 is closed and the polluted with the wastewater wastewater inlet only through the separating screen 12 into the associated connection line or drain 5 or the bypass or the bypass line 7 as pre-treated wastewater enters and from there into the liquid collecting container 8 passes. In this case, the wastewater is converted by means of a deflection or a deflecting plate 16. directs. Because the bulk material collecting container 4 extends predominantly horizontally, whereas the prepurified wastewater is deflected vertically downwards via the discharge line 5 according to the exemplary embodiment in order to be able to enter the pump 6 or the bypass 7 from there. Of course, this is only an example and by no means limiting.

The butterfly valve 13 is connected to the slide-in frame 15 via a hinge 17. 2 that the insertion frame 15 in turn is connected to a closure flange 18 which closes an opening in a box housing part 19b.

In fact, the housing 19a, 19b, 19c of the bulk material collecting container 4 is composed of a tubular housing part 19a and essentially the box housing part 19b. In the box housing part 19b, the dividing screen 12 and the Einschubrah- men 15 and an inner guide 20 to be described in more detail below for the insertable here and again pull-out separating screen 12 are realized. Finally, the housing 19a, 19b and 19c also comprises a deflection housing part 19c, in which the deflection or the deflection plate 16 is arranged. While the Umlenkgehäuseteil 19c and the tubular housing 19a are designed to be predominantly cylindrical, the box housing part 19b not only has the upper-side opening closed by means of the closure flange 18, but is overall U-shaped in cross-section. In fact, the box housing part 19b has an arcuate base and two U-legs extending predominantly parallel to one another, which define the top-side opening with the rectangular closure flange 18 provided there.

The dividing screen 12 provided in the bulk material collecting container 4 can be removed from the bulk material collecting container 4 and inserted into it again, as desired, by means of the optionally closeable and openable opening with the aid of the closure flange 18. For this purpose, the bulk material collecting container 4 is equipped with the inside guide 20 already described above. Based on FIG. 2 shows that the inside guide 20 is U-shaped in a front view, so that the slide-in frame 15 between the two U-legs is kept perfectly in the inserted state. In addition, the insertion frame 15 and the guide 20 in front view are each U-shaped. The respective U-shape follows the U-shaped form of the housing housing part 19b of the housing 19a, 19b, 19c of the bulky waste collection container 4. In this way, the insertion frame 15 with the separating screen 12 arranged thereon and according to the embodiment of the butterfly valve 13th inserted into the inside guide 20 and pulled out of the guide 20 again. The corresponding plug-in as well as a drawing operation of the separating screen 12 takes place predominantly vertically or in the direction of gravity and corresponding to the double arrow shown in FIG. That is, the indicated by the double arrow plug-in as well as the drawing process of the separating screen 12 in the inside guide 20 is perpendicular to the horizontal extent of the bulk material collecting container 4 vor¬ accepted.

As already explained, the separating sieve 12, like the optional shut-off flap 13, is arranged on the insertion frame 15, which interacts with the guide 20 on the inside of the bulky substance collecting container 4. In this way, together with the closure flange 18 in a train the drawer frame 15, the separating screen 12 and finally the butterfly valve 13 are inserted into the guide 20 and pulled out of the guide 20 again. In addition, the separating screen 12, the guide 20 and the insertion frame 15 as well as the butterfly valve 13 in the box housing part 19 b of the otherwise tubular housing 19 a, 19 b, 19 c of the bulk material collecting container 4 are arranged. For the closure of the upper-side opening of the box body part 19b provides the already mentioned rectangular closure flange 18, which can also be equipped with a quick release. The closure flange can also be designed round or oval. The separating screen 12 is composed essentially of a plurality of webs arranged at the edge side of the opening 14 in the insertion frame 15 and spaced apart from one another. 2, the shut-off flap 13 is closed, as shown, and abuts the web-side webs on the webs in question and the separating web 12 forming webs. In FIG. 2, the inlet of the solids laden wastewater via the supply line 3 is closed. As a result, the wastewater flows through the separating screen 12 into the discharge line 5 and the solids or blocking substances are retained by the separating screen 12 in this process. The pre-cleaned wastewater in this way subsequently passes into the liquid collection container 8, as has already been described in the introduction

If there is now a waste water lifting operation and thus a pumping process taking place through the pump 6, the prepurified wastewater sucked in from the liquid collecting container 8 with the aid of the relevant pump 6 is forced into the bulking agent collecting container 4 via the connecting line 5, so that As a result, the butterfly valve 13 lifts off from their investment on the dividing screen 12, as an arrow in FIG. 2 indicates. As a result, the solids previously retained with the aid of the separating screen 12 are released therefrom and removed via the pressure line 11. A provided in the supply line 3 valve or a butterfly valve ensures in this case that the wastewater in question can not get into the inlet manifold 2.

Claims

Claims sewage lifting plant

1. Wastewater lifting plant, comprising at least one bulk material collecting container (4) with at least one separating sieve (12) arranged in its interior for wastewater contaminated with blocking substances and at least one downstream of the bulk substance collecting container (4) Pump (6) which is connected via at least one connecting line (5) with the bulk material collecting container (4), wherein the separating sieve (12) through a closable opening in the bulk material collecting container (4) selectively removable from this and in this is formed replaceable, characterized in that that the bulk material collecting container (4) with an inside guide (20) is formed for the insertable and retractable separating screen (12), wherein both the plugging and the drawing process of the separating screen ( 12) takes place predominantly vertically.

2. wastewater lifting plant according to claim 1, characterized in that the separating screen (12) is arranged on a with the guide (20) interacting insertion frame (15).

3. wastewater lifting plant according to claim 2, characterized in that the slide-in frame (15) and the guide (20) in front view are each U-shaped.

4. sewage lifting installation according to one of claims 1 to 3, characterized in that the separating screen (12), the guide (20) and the insertion frame (15) in a box housing part (19b) of an otherwise tubular housing (19a, 19b, 19c) of the Bulk-collecting container (4) are arranged.

5. wastewater lifting plant according to claim 4, characterized in that the box housing part (19 b) is equipped with the upper-side opening for the separating screen (12).

6. wastewater lifting plant according to claim 5, characterized in that the opening is rectangular and is closed with an associated rectangular closure flange (18).

7. wastewater lifting plant according to one of claims 2 to 5, characterized in that the insertion frame (15) is connected to the closure flange (18).

8. sewage lifting unit according to one of claims 2 to 7, characterized in that the insertion frame (15) in addition to the separating screen (12) additionally a shut-off flap (13) bears.

9. wastewater lifting plant according to claim 8, characterized in that the shut-off flap (13) via a hinge (17) is connected to the insertion frame (15).

10. Abwasserhebean läge according to one of claims 2 to 9, characterized in that the separating screen (12) consists essentially of a plurality of edges of an opening (14) in the insertion frame (15) arranged and spaced apart webs.