Patent ID: 6030531
Filing Date: 2000-02-29
Classification: B01D

Abstract:
A filter element assembly for use in liquid filtration systems adapted to be accommodated within a bag type filter housing, said filter element assembly comprising:an annularly shaped support basket for placement within said filter housing and a collapsible filter insert removably carried within said basket,said basket having first and second rigid cylindrically shaped and concentrically arranged mesh screens allowing for the free flow of liquid therethrough,said first screen arranged interiorly of said second screen forming a first annular space therebetween,said cylindrical screens being connected to each other by a flat circular mesh screen located at one longitudinal end thereof,said filter insert adapted to be supported within said first annular space and having first and second cylindrical filter sleeves formed of flexible filter media, said first filter sleeve having a cross-sectional diameter less than the cross-sectional diameter of said second filter sleeve and arranged concentrically within said second filter sleeve forming a second annular space therebetween,a rigid inlet plate connected at one longitudinal end of both the first and second filter sleeves, and a rigid terminal plate connected at the other longitudinal end of said first and second filter sleeves,said inlet plate having openings provided therein for communicating with said second annular space between said first and second filter sleeves to thereby permit the flow of liquid to be filtered into said second annular space,said terminal plate having a closed surface to prevent the flow of liquid from said second annular space therethrough, said filter insert being collapsible so that said inlet plate and said terminal plate are moveable toward and away from each other when said filter insert is outside of said basket,whereby when said filter insert is carried within said basket said inlet plate and said terminal plate are positioned remote from each other, said terminal plate being positioned adjacent said flat circular mesh screen, and said first sleeve of said filter insert is positioned adjacent and concentrically exteriorly of said first screen of said basket, and said second sleeve of said filter insert is positioned adjacent and concentrically interiorly of said second screen of said basket so that said cylindrical screens of said basket support said sleeves of said filter element against the pressure of liquid flow, and whereby when said filter element assembly is arranged within a filter housing said inlet plate of said filter insert will be oriented to receive liquid to be filtered which enters said filter housing so that liquid will pass through said openings into the annular space between said first and second filter sleeves for passing first through said filter sleeves and said screens of said basket to effect filtration of impurities or particles therefrom.