Patent ID: 6238560
Filing Date: 2001-05-29
Classification: B01D

Abstract:
A collapsible filter element for use in bag type liquid filtration systems comprising:first and second cylindrical filter sleeves formed of flexible filter media, said first filter sleeve having an across-sectional diameter less than the cross-sectional diameter of said second filter sleeve and arranged concentrically within said second filter sleeve forming an annular space therebetween, said first filter sleeve forming a cylindrical space interiorly thereof,a rigid circularly shaped inlet plate connected at one longitudinal end of both the first and second filter sleeves, said inlet plate having an outer circumferential edge and a central circular area corresponding to the cross-sectional area of said cylindrical space and a rigid closed terminal plate connected at the other longitudinal end of both said first and second filter sleeves, said first filter sleeve being ultrasonically welded to said inlet plate proximate to the outer circumferential edge of said inlet plate, said second filter sleeve being ultrasonically welded to said inlet plate proximate to the circumference of said central circular area,said inlet plate having openings provided therein between said outer circumferential edge and the circumference of said central circular area for communicating with said annular space between said first and second filter sleeves to thereby permit the flow of liquid to be filtered into said annular space, said terminal plate having a closed surface to prevent the flow of liquid from said annular space therethrough, said filter element being collapsible so that said inlet plate and said terminal plate are moveable toward and away from each other when said filter element is outside of said filtration system,said filter element adapted to be carried within a support basket when said filter element is positioned within said filtration system, said inlet plate and said terminal plate being positioned remote from each other when said element is carried within said filter system, andwhereby when said filter element is arranged within said filtration system said inlet plate will be oriented to receive liquid to be filtered so that liquid will pass through said openings into said annular space between said first and second filter sleeve for passing through said filter sleeves for filtration of impurities or particles therefrom.