Filtration set for gradual screening of fine and coarse particles in a single operating unit

摘要

Filtration assembly for gradual screening of coarse and fine particles in a liquid stream, the assembly comprising: a body (13) of the filter, comprising an inlet (1) and an outlet (5), a cylindrical sieve of coarse filtration (2) which has sieve openings (Sc), a diameter (dc) and a first filtration volume (21) and a cylindrical fine filtration sieve (4) that has sieve openings (Sf) smaller than those of the coarse filtration sieve (2) and a diameter (df) greater than that of coarse filtration sieve (2), wherein said coarse and fine filtration sieves (2, 4) are concentrically arranged in the body (13) of the filter to define a second filtration volume (3) between them, so that only the liquid filtered through the coarse filter sieve (2) can pass to said second filtration volume (3), an upper discharge unit (20 ) comprising a thick filtration drain body a (11) in fluid communication with the first filtration volume (21) and a fine filtration drainage body (12) in fluid communication with the second volume (3), said coarse and fine filtration drainage bodies being (11, 12) equipped with the corresponding discharge valves (9, 9 ') and cleaning means (14) comprising a main collection arm (16) extending through the first volume (21) and, by at least one side arm (22), at least one end of which is connected to said main collection arm (16) and extending through the second volume (3) between the filtration screens (2, 4 ), whereby the fluid communication of said second volume (3) and the fine filtration drain body is provided by said lateral arm (22).