Liquid purification or separation – Structural installation – Grated inlet surface drain
Patent
1984-12-06
1987-03-24
Fisher, Richard V.
Liquid purification or separation
Structural installation
Grated inlet surface drain
210166, 52 12, B01D 3502
Patent
active
046523650
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATION(S)
This United States application stems from PCT International Application No. PCT/SE84/00139 filed Apr. 13, 1984.
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a waste screen for a roof drainage outlet, which is located substantially in the roof plane and consists of an outlet opening in the roof and a plate covering said opening, which plate has such a circumference and vertical distance above the roof plane, that at least at the design flow rate air is prevented from being sucked in beneath the plate edge, and the gap between the plate and roof plane, thus, constitutes the outlet port.
2. Description of the Prior Art
Waste screens for roof drainage outlets are known in various different designs. The simplest type consists of a perforated plate laid above the outflow opening. One requirement, however, is that there must be an outlet through the opening even when the screen is clogged, and that such outlet must comprise a so-called overflow outlet. Screens for roof discharge pipes, therefore, often are designed as cylinders with perforated casing surfaces, and the upper edge of the casing constitutes the overflow edge. This implies that in the a clogged casing surface the water rises and flows over the upper edge of the casing and through the interior of the casing without being screened.
BRIEF SUMMARY OF THE INVENTION
The present waste screen according to the invention is intended to be used as a special roof drainage device, which consists of an opening and a plate as referred to above, and which acts in such a manner, that air cannot be sucked in beneath the plate and, thus, turbulence cannot arise in the outlet. Such turbulence would render it impossible to utilize the entire opening of the outlet, but would cause the water to rotate in the opening and thereby form a cavity centrally in the opening, which cavity would be propagated downward in the outlet after the outlet opening.
A special object of the present invention is to ensure that the water on its passage from the pitch to the outlet opening always passes through the outlet port, which ensures that the filling capacity for the outlet opening and, thus, the outlet is one, i.e. the outlet opening and subsequent pipe are entirely filled with water.
For achieving the aforesaid objects, the invention is characterized in that the screen extends about the circumference of the plate and comprises a screen wall, which extends from the roof plane to a plane above the roof plane through the circumference (circumferential edge) of the plate and comprises a through-flow wall extending from here to the upper surface of the plate. which walls are joined along their upper edges which, thus, constitute an overflow edge inward to the upper surface of the plate, when the screen wall does not permit arriving flow to pass through, owing to reduced passage capacity of the screen wall. The waste screen thereby ensures that inflow to the outlet opening always takes place through the outlet port.
BRIEF DESCRIPTION OF THE DRAWINGS
An embodiment of the invention will now be described in detail with reference to the accompanying drawings, wherein
FIG. 1 is a cross-sectional veiw through the waste screen according to the invention, which screen is provided together with a roof drainage device
FIG. 2 is a portion of a top plan view showing a partial cross-section taken along the line II--II in FIG. 1.
DETAILED DESCRIPTION
In FIG. 1 the numeral 1 designates a roof plane, which may be entirely horizontal or inclined. The roof plane 1 includes an opening 2, which according to the drawing is formed with streamlined walls and transforms to an outlet pipe 3. The opening is covered by a plate 4 in the form of a disc spaced upward from the roof plane 1. The distance of the plate is calculated so that at the designed amount of effluent water air is not sucked in beneath the plate, thereby preventing turbulence from arising in the outflow opening 2, which turbulence would cause air to be sucked dow
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Aeromator Trading Company AB
Fisher Richard V.
Millard Wanda L.
Oy Kontekla
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