Road gully water filter for road gullies for the purposes of removing solids
Patent Information
- Application Number
- EP2025721468
- Authority / Receiving Office
- EP · EP
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2024-03-13
- Filing Date
- 2025-03-13
- Publication Date
- 2026-01-14
AI Technical Summary
Conventional street drain filters require frequent maintenance due to the use of filter bodies or bags that quickly become contaminated, necessitating maintenance cycles as short as every 2 to 3 months, and are not easily retrofittable to existing systems.
A street drain water filter design featuring a cylindrical guide part and filter part that abut at a transition region, allowing water to flow through a filter wall without a filter bag, which is automatically cleaned by rinsing and can be easily removed for deeper cleaning, maintaining a 12-month maintenance cycle without structural modifications.
The filter design effectively extends maintenance intervals to 12 months by automating the cleaning process and eliminating the need for filter bags, ensuring user-friendly operation and compatibility with existing drains.
Smart Images
Figure DE2025000026_18092025_PF_FP_ABST
Abstract
Description
[0001] Street drain water filter for street drains to remove solids
[0002]
[0001] The invention relates to a street drain water filter for street drains for removing solids, in particular tire abrasion and microplastics, from the street drain water with a cylindrical guide part and a cylindrical filter part.
[0003]
[0002] Such street drains for decentralized drainage are known as Budavinci drains. Here, the water flows from the outside into a filtering treatment chamber with a filter body and passes through the filter body into a wet sludge trap.
[0004]
[0003] In a street drain filter sold under the Innolet brand, the cleaning effect is achieved through a combination of surface filtration, volume filtration, and adsorption. For this purpose, the street drainwater also flows through a filter body that is removable and regenerable.
[0005]
[0004] Weischer GmbH offers a geotextile filter bag that is used as an insert for a street drain.
[0006]
[0005] Cleaning the filter bodies makes these street drain filters extremely maintenance-intensive. A typical maintenance cycle for a street drain is approximately 12 months. However, conventional systems with filter bodies require maintenance after only 2 to 3 months.
[0007]
[0006] EP 4 265 859 A1 describes a non-retrofittable solution with several filter modules, which is only suitable for a special gully structure.
[0008]
[0007] DE 10 2011 106 270 A1 describes a conical holder on which a closed bag hangs.
[0009] CONFIRMATION COPY
[0008] The invention is therefore based on the object of further developing a street drain water filter.
[0010]
[0009] This object is achieved with a generic street drain water filter in which the cylindrical guide part and the cylindrical filter part abut one another in a transition region in such a way that water flowing on the inside of the guide part reaches the filter part at the transition region and the filter part has an opening at an end remote from the transition region through which the water can leave the filter part.
[0011]
[0010] Advantageous embodiments are the subject of the subclaims.
[0012]
[0011] The invention is based on the realization that a filter body or filter bag is not necessary at all. A filter wall is sufficient, along which the street runoff water can flow and through which the street runoff water can pass. This allows solids on the inside of the filter material to slide into the wet sludge trap, and water can flow radially outward through the filter wall as purified water and into a drain.
[0013]
[0012] This allows for a very large filter wall to be provided, which is automatically cleaned by the subsequent water rinsing the filter wall. The fabric can be so flexible that it moves easily during practical use, thus assisting in the rinsing off of contaminants.
[0014]
[0013] The cylindrical filter element can also be easily removed from the street drain for hose-down or more intensive cleaning. Experience has shown that the usual maintenance cycle of approximately 12 months can be maintained in this way.
[0015]
[0014] The filter insert presented here is therefore particularly user-friendly.
[0015] Since no filter bag is used, there is no filter bag that can fill with contaminants and then have to be emptied again later.
[0016]
[0016] The filter can be installed in existing street drains without any structural measures and thus also represents a retrofit solution.
[0017]
[0017] The opening may have the diameter of the filter part.
[0018]
[0018] The filter part may be hollow and consist only of a cylindrical filter.
[0019]
[0019] It is advantageous if the filter element hangs loosely. This allows the filter element to move slightly as water flows along it. This assists in cleaning the fabric.
[0020]
[0020] Tests have shown that the filter section should be at least half as long as the guide section. However, the lengths of the filter section and guide section vary depending on the road gully.
[0021]
[0021] Preferably, the guide part has an air-impermeable wall and the filter part has a wall with an air permeability at dp = 200 according to DIN EN 9237 of more than 1000 l / m2 / s.
[0022]
[0022] An air permeability of less than dp = 200 according to DIN EN 9237 of more than 20,000 l / m2 / s is particularly advantageous.
[0023]
[0023] Practical values for air permeability are 2,000 l / m2 / s to 10,000 l / m2 / s or 4,000 l / m2 / s to 6,000 l / m2 / s.
[0024]
[0024] The filter part may have a wall made of a fabric, preferably a wire mesh.
[0025]
[0025] The guide part may comprise a tube made of plastic or metal.
[0026] A preferred embodiment provides that the filter part is designed to be movable upward relative to the guide part for cleaning. Preferably, the filter part is movable upward relative to the guide part even when installed.
[0026]
[0027] It is also advantageous if the filter part is designed to be movable downwards relative to the guide part in order to adapt to the shaft depth.
[0027]
[0028] If the filter part is removable from the guide part, it can be easily replaced in case of damage.
[0028]
[0029] It is also advantageous if the cylindrical guide part is arranged between a head and the filter part. The guide part can either be detachably guided from both the head and the filter part, or it can only be detachable from the filter part, so that the head and the guide part are manufactured as a single part.
[0029]
[0030] In practical application, the guide part and the filter part below it are arranged in a shaft with a wet sludge trap and a shaft drain in such a way that the guide part is arranged outside the wet sludge trap and at least the lower end of the filter part is in the wet sludge trap.
[0030]
[0031] It is advantageous if the shaft has a drain above the wet sludge trap and a part of the guide part or the filter part is arranged at the height of the drain.
[0031]
[0032] In terms of the method, the object underlying the invention is achieved with a method for filtering street runoff water at street drains, in which the street runoff water reaches the wall of a cylindrical guide part through an inlet, flows from there to a cylindrical filter part and into a wet sludge trap, while a part of the street runoff water flows through the wall to an outflow and another part of the wastewater flows through the wet sludge trap to the outflow.
[0033] An embodiment is shown in the figure and is described in more detail below.
[0032]
[0034] The only figure shows a partially sectioned view of a street drain filter.
[0033]
[0035] The street drain water filter 1 has an insert 2 at the top for interaction with a street drain. This insert 2 has a flange 3 and a circumferential flange 4. The flange has inlet openings 5, 6. A hook 7 attached to the flange facilitates the removal of the entire street drain water filter 1 from a street drain (not shown).
[0034]
[0036] A cylindrical guide part 8 is attached to the insert 2, comprising an upper part 9 and a lower part 10. For tool-free length adjustment, the upper part 9 and the lower part 10 are connected by a hook-and-eyelet connection 11. For this purpose, several hooks 12 are provided on the upper part 9, which can interact with eyelets 13 on the lower part.
[0035]
[0037] A cylindrical filter element 14 is attached to the cylindrical guide element 8. This is a plastic or metal mesh bent into a tube that is open at the top and bottom. This mesh of the filter element 14 is attached to a ring 15, which in turn can be attached to the guide element 8 at different heights using a hook-and-eyelet connection 16.
[0036]
[0038] When using the street drain filter 1, the cylindrical guide part 8 and the cylindrical filter part 14 lie against one another in a transition area 17 in such a way that water penetrating at the inlet openings 5, 6 and flowing on the inside of the guide part 8 reaches the filter part 14 at the transition area 17 and the filter part 14 has an opening 19 at an end 18 remote from the transition area 17, through which the water can leave the filter part 14.
[0039] In order for the water flowing down inside to be able to escape from the cylindrical filter part 14, the guide part 8 has an air-impermeable tube 20 and the filter part 14 has a wall 21 with an air permeability at dp = 200 according to DIN EN 9237 of more than 20,000 l / m2 / s.
[0037]
[0040] The guide part 8 is detachably attached to both the cylindrical filter part 14 and the insert 2, also referred to as the head, preferably even without tools.
[0038]
[0041] The guide part 8 and the filter part 14 below it are arranged in a shaft 22 with a wet sludge trap 23 and a shaft drain 24 such that the guide part 8 is arranged outside the wet sludge trap 23 and at least the lower end of the filter part 14 is arranged in the wet sludge trap 23.
Claims
Patent claims:
1. Street drain water filter (1) for street drains for removing solids, in particular tire abrasion and microplastics, from the street drain water, comprising a cylindrical guide part (8) and a cylindrical filter part (14), characterized in that the cylindrical guide part (8) is an air-impermeable tube (20), the cylindrical guide part (8) and the cylindrical filter part (14) abut one another in a transition region (17) in such a way that water flowing on the inside of the guide part (8) reaches the filter part (14) at the transition region, and the filter part (14) has an opening (19) at an end (18) remote from the transition region (17) through which the water can leave the filter part (14).
2. Street drain water filter according to claim 1, characterized in that the opening (19) has the diameter of the filter part (14).
3. Street drain water filter according to one of the preceding claims, characterized in that the filter part (14) is hollow and consists only of a cylindrical filter.
4. Street drain water filter according to one of the preceding claims, characterized in that the filter part (14) hangs loosely.
5. Street drain water filter according to one of the preceding claims, characterized in that the filter part (14) is at least half as long as the guide part (8).
6. Street drain water filter according to one of the preceding claims, characterized in that the guide part (8) has an air-impermeable tube (20) and the filter part (14) has a wall (21) with an air permeability at dp = 200 according to DIN EN 9237 of more than 1000 l / m2 / s.
7. Street drain water filter according to one of the preceding claims, characterized in that the guide part (8) has an air-impermeable tube (20) and the filter part (14) has a wall (21) with an air permeability of less than dp = 200 according to DIN EN 9237 of more than 20,000 l / m2 / s.
8. Street drain water filter according to one of the preceding claims, characterized in that the filter part (14) has a wall (21) made of a fabric.
9. Street drain water filter according to one of the preceding claims, characterized in that the filter part (14) has a wall (21) made of a wire mesh.
10. Street drain water filter according to one of the preceding claims, characterized in that the guide part (8) has a tube (20) made of plastic.
11. Street drain water filter according to one of the preceding claims, characterized in that the guide part (8) has a tube (20) made of metal.
12. Street drain water filter according to one of the preceding claims, characterized in that the filter part (14) is designed to be movable upwards relative to the guide part (8) for cleaning purposes.
13. Street drain water filter according to one of the preceding claims, characterized in that the filter part (14) is designed to be movable downwards relative to the guide part (8) for adaptation to the shaft depth.
14. Street drain water filter according to one of the preceding claims, characterized in that the filter part (14) is removable from the guide part (8).
15. Street drain water filter according to one of the preceding claims, characterized in that the cylindrical guide part (8) is arranged between a head and the filter part (14) and is designed to be detachable from both the head (2) and the filter part (14) or only from the filter part.
16. Street drain water filter according to one of the preceding claims, characterized in that the guide part (8) and the filter part (14) below it are arranged in a shaft (22) with a wet sludge trap (23) and a shaft drain (24) in such a way that the guide part (8) is arranged outside the wet sludge trap (23) and at least the lower end of the filter part (14) in the wet sludge trap (23).
17. Street drain water filter according to claim 16, characterized in that the shaft (22) has the shaft drain (24) above the wet sludge trap (23) and a part of the guide part (8) or the filter part (14) is arranged at the height of the shaft drain (24).
18. A method for filtering street runoff water at street drains, in which the street runoff water passes through an inlet to the wall of a cylindrical guide part (8) designed as an air-impermeable pipe, from there flows to a cylindrical filter part (14) and into a wet sludge trap, while part of the street runoff water flows through the wall to an outflow and another part of the wastewater flows through the wet sludge trap to the outflow.