Patent ID: 6866777
Filing Date: 2005-03-15
Classification: B01D

Abstract:
1. A water filter for filtering dirty water having a plurality of suspended solid particles, said water filter comprising: an intermediate plate assembly including at least three annular intermediate plates and at least one annular flow-guiding plate, which are arranged one above another, each of said flow-guiding plate and said intermediate plates including an annular top plate superposed on an uppermost one of said intermediate plates and having an annular bottom plate, on which a lowermost one of said intermediate plates is superposed, said bottom plate having a plurality of laminated filter units disposed respectively within a respective one of said accommodating spaces, each of said filter units including two water-permeable annular filter films that are received fittingly within the respective one of said accommodating spaces and that are interconnected fixedly along outer peripheral portions thereof, and an annular filter net that is sandwiched between said filter films so as to define an annular filtered-water passage between said filter films, thereby preventing flow of the solid particles into said filtered-water passage via said filter films, said filtered-water passages having inner peripheries that are in fluid communication with said central holes in said intermediate plates so as to permit water flow between said central holes in said intermediate plates and said filtered-water passages, the dirty water being capable of being forced into said openings in said top plate when said openings in said bottom plate are closed such that the dirty water flows into said filtered-water passages along a flow path of said annular outer passage units in said intermediate plates and said curved outer passage unit in said flow-guiding plate, said upper and lower grooves in said top, intermediate and bottom plates, and said filter films, thereby forming filtered water, which in turn flows out of said water filter through said central hole in said bottom plate; and means for connecting said intermediate plates removably to said top and bottom plates and said flow-guiding plate; whereby, when said side openings in said bottom plate are opened, the dirty water can flow out of said water filter through said side openings in said bottom plate.