| 摘要 |
A nozzleless, strainerless filter bottom includes a first set of blocks laid end-to-end in spaced parallel rows to define elongated channels. Transverse grooves in the lower surface of the first set of blocks provide communication between adjacent channels. A second set of blocks laid end-to-end in spaced rows which are parallel to and overlap the rows of first blocks form covers for the longitudinal channels. Transverse slots in the lower surface of the second set of blocks form with the upper surface of the first set of blocks passages through which filtrate and backwash fluid may pass without clogging. A pair of laterally spaced longitudinal flanges depending from the lower surface of the second set of blocks extend into the lower elongated channels and bear against the adjacent sides of the first set of blocks to prevent lateral displacement of both sets of blocks. Longitudinal ribs extending upwardly from the upper surface of the first set of blocks give added strength thereto and prevent clogging of the passages with filter media. |
