| 摘要 |
A bottom for a filter of the type that employs granular material for removing impurities from liquids includes a trough, the bottom wall of which is interrupted by an egress passage for the granular material. Lateral wall sections of the bottom slope upwardly away from the trough toward sidewalls of the filter. An elongate header, having a central passageway therethrough, is embedded in an elongate sidewall section defining a part of the trough, and a plurality of openings are provided through an outer wall of the header and spaced-apart along the elongate extent thereof for permitting filtered liquid to pass into the header. A plurality of conduits extend laterally from the header and include central passageways communicating with the central passageway of the header. These conduits are spaced-apart along the elongate extent of the header and slope upwardly from the header toward sidewalls of the filter and are embedded in the sloping lateral wall sections of the bottom. The lateral conduits include a plurality of openings through the outer walls thereof, and these openings are spaced along the elongate extent of the conduits for receiving filtered liquid. Liquid-pervious screen devices are associated with the openings through the outer walls of the header and lateral conduits for permitting filtered liquids to enter the header and conduits while impeding the flow of the granular material. The filtered liquid received within the lateral conduits and header pass through an outlet from the filter.
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