Patent ID: 7293659

Claim:
Drum structure for corrugated type rotary filters comprising: a rotary drum support structure; a corrugated deck section having an upper surface for receiving a liquid flow of material to be filtered; a plurality of circumferentially separated solid non-apertured divider grids for rigidly connecting the corrugated deck section in spaced relationship to the rotary drum support structure and to thereby define therebetween a drain channel; a plurality of intermediate solid non-apertured grids positioned within the drain channel at circumferentially spaced apart locations such that at least one of the intermediate grids is positioned between each adjacent pair of the divider grids so as to subdivide the drain channel into respective compartments, the intermediate grids being structurally unconnected to the corrugated deck along an upper edge thereof but providing subjacent radial support thereto; drainage slits provided in the corrugated deck each in alignment with a respective one of the compartments; and plug dams provided in corrugation spaces between the upper edge of the intermediate grids and a lower surface of the corrugated deck so as to prevent substantially filtrate flow between individual ones of the compartments, whereby filtrate flows through the drainage slits and into a respective one of the compartments where it can then subsequently be drained transversely and longitudinally relative to the drum filter.