Liquid purification or separation – Structural installation – Grated inlet surface drain
Patent
1995-07-10
1997-12-30
McCarthy, Neil
Liquid purification or separation
Structural installation
Grated inlet surface drain
210163, 210232, 210248, 210460, 523021, E04D 1304
Patent
active
057025967
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a roof water inlet having a water collection trough, which has an edge to be arranged in the plane of a roof and a bottom arranged with spacing from the edge with an opening. The opening leading to a drainage pipe mounted down at the bottom, and has a plate which is arranged above the opening in the bottom. The edge of the plate extending beyond the opening.
BACKGROUND OF THE INVENTION
Roof water inlets of this type have been disclosed by U.S. Pat. No. 1,791,512, DE-A-1,948,214 and DE-A-2,650,361. These each have a plate above the mouth of the drain, which plate is intended to prevent air from being sucked in thus to bring about a closed flow in the drainage pipe. A closed flow allows pipes to be filled completely, compared to roof drainage without closed flow, this allows smaller tube dimensions, fewer roof water inlets for a given roof area and thus also requires less space and less expenditure for assembly.
In the known roof water inlets, the difficulty is now that the capacity is greatly dependent on the quantity of water and, in particular, a desirable, smooth and continuous drainage is not guaranteed in every case. In these roof water inlets, one problem continues to be the risk of blockage, for example due to foliage, which has entered the water collection trough.
SUMMARY AND OBJECTS OF THE INVENTION
The invention is based on the object of providing a roof water inlet of the type mentioned, which works more smoothly and continuously with less risk of blockage and has an improved capacity over the entire water quantity range.
In the roof water inlet according to the generic type, the object is achieved in that two plates are arranged spaced apart, a lower plate being arranged in the water collection trough and an upper plate being arranged above the edge of the water collection trough, and the edge of the upper plate projecting beyond the edge of the water collection trough in such a way that, to form a closed flow in the drainage pipe. The water to be conducted away is accelerated ahead of the edge of the water collection trough and, after a two-fold deflection by about 90.degree. in each case, ahead of the opening in the bottom. In the water inlet according to the invention the acceleration route is considerably longer compared to the known roof water inlets. By means of a suitable arrangement of the two plates, it is possible to reduce the passage cross-section for the water in stages, seen in the direction of flow, and thus to achieve a higher flow velocity in the drainage pipe and thus a higher drainage capacity. The higher water velocity and the multiple deflection of the water bring about improved self-cleaning of the water collection trough. The longer acceleration route additionally guarantees a smoother and more continuous flow. With a comparatively small quantity of water, a closed flow is guaranteed at least by the lower plate. Tests have shown that, with an internal pipe cross-section of 50 mm, a drainage capacity of about 12 liters per second can be achieved. A closed flow is thus guaranteed with small and large quantities of water and, with large quantities of water, the capacity is considerably higher than in the case of inlets of similar size having only one plate. A considerable advantage of the invention is also seen in the fact that, owing to the higher capacity, fewer different roof water inlets have to be produced and kept in store for different national regulations.
Since, in the roof water inlet according to the invention, two plates are provided, arranged spaced apart, it is possible to fix the lower plate on the upper plate so that the lower plate can then be held freely on its underside and consequently requires no fixing means here, which in turn reduces the risk of blockage and results in a smoother flow. Additionally, it is possible to design the two plates and, if appropriate, a foliage trap and a gravel ring as a unit and to fix it releasably on the water collection trough. According to a further development of the
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Haesler Heinz
Juple Pierre
Geberit Technik AG
Green Theodore M.
McCarthy Neil
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