Filter device having auto cleansing function

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PURPOSE : A filtering apparatus with an automatic washing function is provided to continue filtering operations and automatically wash a plurality of filters by washing one of the filters while filtering fluid based on remaining filters. CONSTITUTION : A filtering apparatus(300) with an automatic washing function includes a housing(10), an upper plate(20), a lower plate(30), a cylindrical member(40), a filtering member(50), an inlet(60), an outlet(70), an upper blocking member(80), a lower blocking member(90), and a fluid pushing member(100). The upper plate includes an upper plate circumference through hole(22). The lower plate includes a lower plate circumference through hole(32). The cylindrical member connects the upper plate circumference through hole and the lower plate circumference through hole. The filtering member is inserted into the cylindrical member. The inlet is arranged between the lower plate and the bottom of the housing. The outlet is arranged between the upper plate and the top of the housing. The upper and the lower blocking members respectively include a spraying pipe(82) and a discharging pipe(92). The fluid pushing member is combined with the housing and includes a fluid storing space. The outlet of the fluid pushing member is in connection with the spraying pipe of the upper blocking member.