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Overflow water screening apparatus
| Details |
Inventors: Filion, Gilles;
Assignee: John Meunier Inc. (Montreal, CA)
Primary Examiner: Lithgow; Thomas M.
Assistant Examiner:
Attorney, Agent or Firm: Martineau; F.
The water screening apparatus of the invention includes a conduit in which is positioned a discharge pipe opening through which water flowing in the conduit is to be dispatched completely during normal water flow conditions. The discharge pipe opening is positioned adjacent the conduit bottom wall portion so that as long as the water level does not rise above it, the water is completely dispatched therethrough. A bar screen is transversely disposed inside the water conduit and downwardly slopes from the conduit upstream end to the discharge pipe opening and covers the whole conduit width. When the water level rises above the discharge pipe opening, the water flowing above the discharge pipe opening will flow through the bar screen, the latter intercepting any macroparticles beyond a set threshold level carried by the water flow. These intercepted solid particles will slide along the bar screen under the pressure exerted by the water flow, to be carried in this way into the refuse discharge pipe to be disposed of along with part of the water flow. This way, during water overflow conditions, even if the water is not completely disposed of by means of the discharge pipe opening, the overflow water will not carry large solids or suspended matter, since it will be screened before being conveyed elsewhere, for example to a river. |
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DETAILED DESCRIPTION OF THE EMBODIMENTS FIGS.
1 to 3 show an overflow water screening apparatus 10 comprising a hollow conduit 12 serially mounted to a conventional, cylindrical water drainage pipe 14.
Drainage pipe 14 has an upstream end 14a and a dowstream end 14b and is destined to convey a water flow from upstream end 14a to downstream end 14b, to be disposed of in a conventional fashion, e.
g.
into a river.
The water flow can originate from a city sewer duct system, for example.
Conduit 12 is of course serially attached to the adjacent end sections of pipe 14 in a fluid tight fashion, e.
g.
integrally as suggested in FIG.
1.
Conduit 12 has a quadrangular cross-section, as illustrated in FIG.
4, although a round cross-section or any other suitable shape are envisioned within the scope of this invention, with corresponding changes to the shape of the other related parts of the water screening apparatus.
Conduit 12 defines a bottom wall portion 12a (FIGS.
1 and 3) which is flat, a pair of upright side wall portions 12b and 12c and an overlying top wall portion 12d.
Conduit 12 further defines an upstream end 12e and a dowstream end 12f.
Screening apparatus 10 further comprises a refuse discharge pipe 16 (FIG.
2) which has a cross-sectional area being much smaller than that of the conduit 12 or drainage pipe 14.
Refuse discharge pipe 16 has a semi-frusto-conical fluid outlet portion 16a which lies directly against conduit bottom wall portion 12a, with its concavity downwardly oriented so as to define a fluid intake port 16b (FIG.
3).
Refuse discharge pipe intake port 16b faces conduit upstream end 12e so as to receive at least part of the water flowing into conduit 12.
This water then flows into refuse discharge pipe 16, the latter conveying the water out of conduit 12 to be disposed of or treated in a proper fashion.
A substantially semi-cylindrical bar screen 18 is fixedly and transversely attached in conduit 12, with its concavity downwardly oriented, and defines a first upstream end 18a and a second downstream end 18b
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CPUs 
