Patent ID: 7913855

Claim:
A self cleaning filter for agricultural irrigation water, comprising: A) a substantially cylindrical casing ( 1 ) with an internal surface and having first and second ends, an inlet ( 11 ), first outlet ( 10 ), and second outlet ( 12 ), said inlet ( 11 ) and said first outlet ( 10 ) being radially connected to said casing ( 1 ) and said second outlet ( 12 ) being axially disposed on said first end; B) a cartridge assembly ( 3 ) including a plurality of stacked rings ( 3 ′), each ring ( 3 ′) having a central through opening, said cartridge assembly ( 3 ) being coaxially disposed within said casing defining an outer annular chamber between said rings ( 3 ′) and said internal surface and an inner chamber ( 2 ′) inside said central through opening; C) at least one elongated pipe ( 4 ) having a plurality of perforations ( 4 ″); D) a support base is mounted at a cooperative location below said inlet and first outlet and supporting said cartridge assembly and further including at least one through hole ( 8 ′) to permit said at least one pipe ( 4 ) to freely pass through; E) an upper cover ( 5 ) mounted to said third open ends closing said third open ends; F) an end round base ( 6 ) for generating the axial thrust required to separate said rings; and G) a spring loaded lower base ( 9 ) movable between cleaning and filtering positions, in said filtering position said lower base ( 9 ) being separated from said support base ( 8 ) to permit the water from a source of pressurized water connected to said inlet to pass through said outer annular chamber ( 2 ) and between said rings ( 3 ′) into said inner chamber ( 2 ′) and down to said second outlet ( 12 ), and in said cleaning position when said inlet ( 11 ) is selectively closed and said first outlet ( 10 ) opened, said spring loaded lower base ( 9 ) comes in abutting relationship with said support base ( 8 ), said base ( 9 ) further including at least one through opening ( 9 ′) for each of said at least one elongated pipe ( 4 ), thereby forcing the water to backflow through said fourth open ends of said at least one pipe, passing out through said perforations and rings ( 3 ′) so that any debris entrained between said discs is removed and pushed radially outwardly to said outer annular chamber and subsequently through said first outlet ( 10 ).