Patent ID: 6808076
Filing Date: 2004-10-26
Classification: B01D

Abstract:
SELF-CLEANING DRUM FILTER comprising a pressure vessel (11) into which liquid to be filtered is pumped, containing a cylindrical filtering drum (15) to whose outside curved surface a filtering mat (57) is juxtaposed, the liquid passing through said filtering mat from the outside to the inside (65) of said drum, said filter being provided with means for removal of cake collected on the outside of said filtering mat, rotation of said drum during the cake-removal operation being provided by linkage means between a motor-driven speed reducer and said filtering drum, the filter being provided with sealing means between the outside and the inside of said filtering drum, characterized by the fact that said means for removal of the cake comprise a scanner plate (18) whose outer face is juxtaposed to the inside wall of said pressure vessel, the inner face (69) of said scanner plate, facing said filtering drum, being provided with a through-slit (22) that provides a passage between said inner face (69) and said outer face (68) of said scanner plate, said slit being substantially parallel to a drum generatrix closest to said scanner plate, said outer face (68) of said scanner plate being provided, along the length of said slit (22), with a trough (21) which forms, together with the inner wall of said pressure vessel, a channel for collecting flushing liquid during the cake-removal cleaning operation, said channel communicating with an exit conduit (24) outside said pressure vessel by means of a plurality of through-holes (23) in the wall (19) of said pressure vessel.