| 摘要 |
The screening apparatus of the invention has a main cylindrical chamber linking a waste water inlet pipe to a refuse pipe and to an overflow outlet pipe. The waste water inlet pipe conveys water from a city sewer duct or the like, and this water is destined to be conveyed to a water treatment plant through the refuse pipe. However, during important storm water flow rate conditions in the waste water inlet pipe, the water level in the main chamber will rise since the refuse pipe will overflow due to a too large quantity of water. The screening apparatus includes a coaxial, cylindrical rotor defining a vertical through channel, and an annular grate being located intermediate the top and bottom of the main chamber and extending from the bottom edge of the rotor radially outwardly to the peripheral wall of the main chamber, where the annular grate is fixedly anchored. The rotor carries brooms adjacent the grate underface. Thus, when the water level rises, it passes through the grate to be effectively screened before it reaches the overflow pipe outlet, to be returned into the environment. The rotor can rotate under the power of the water flow, by means of downwardly projecting blades, so that the brooms will rotate to sweep the whole grate underface and help prevent clogging of the grate by macroparticles. The waste water pipe is connected to the main chamber in an eccentrical fashion, so as to create a water vortex when the water flows into the main chamber.
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