Patent ID: 6235209
Filing Date: 2001-05-22
Classification: B01D,B23Q

Abstract:
A process of filtering cutting fluids used in a metal cutting machine comprising the steps of collecting cutting fluids contaminated with solid particles and other material in said metal cutting machine and passing said fluid through a main filter apparatus to remove said particles and other material therefrom;directing pressurized filtered liquid from said main filter apparatus into a closed sealed tank enclosing an auxiliary filter to remove residual particles, said auxiliary filter including a hollow member having a filter screen mounted about an open outer perimeter extending about a central axis;rotating said hollow member about said axis while said member is completely enclosed in said tank of pressurized filtered liquid;causing pressurized liquid in said tank to flow through said screen and into a liquid receiving hollow space in said hollow member;directing a series of spray jets of liquid under a pressure higher than existing in said tank at said screen as said screen is rotated past said jets to thereby clean said screen as it is rotated past said spray jets, said rotation producing a screen surface speed velocity sufficiently high to also tend to dislodge particles and other material from said screen so that together with the effects of directing spray jets at said screen, said screen is maintained clean of said particles and other material; anddrawing particles and other material dislodged from said screen into an outflow of liquid from said tank creating a flow current passing along the vicinity of said spray jets; andreturning liquid drawn into said hollow member through said screen from said tank back to said metal cutting machine.