Continuous backwashing filter apparatus with filtered fluid retention plate

A backwash filter apparatus for removing solids from fluids, comprising:

• a filter housing comprising an upper compartment defining an inlet chamber having an inlet for permitting introduction of an unfiltered fluid into the inlet chamber, and a lower compartment defining an outlet chamber having an outlet for permitting discharge of a filtered fluid from the outlet chamber;
• stationary filter means located in the said filter housing and rigidly supported between said inlet chamber and said outlet chamber;
• a backwash housing comprising an elongate backwash hood having a backwash outlet therein, mounted for rotation about an axis normal to said filter means, said backwash hood comprising at least one sliding shoe in contact with an inlet side of said filter means, said sliding shoe having a radially extending slit therethrough which provides communication between a substantial radially elongate area on said filter means and an interior of said backwash housing, said sliding shoe providing a virtually leakproof seal on the inlet side of the filter means thereby separating the interior of said backwash housing and said inlet chamber;
• and
• retention plate means for providing sufficient retention of filtered fluid proximate at least a substantial portion of an outlet side surface of said filter means to allow substantially instantaneous and continuous backwashing of said filter means said retention plate means comprising a lower rigid support plate having an upper surface which contacts and supports said filter means, said upper surface comprising a plurality of grooved formed therein which temporarily retain filtered fluid in said outlet chamber at a location immediately proximate the outlet side surface of said filter means;
• wherein said backwash housing provides continuous backwashing of said filter means over a rinsing area accessed by the slit in said sliding shoe.

A backwash filter apparatus for removing solids from fluids, comprising:

• a filter housing comprising an inlet chamber with an inlet permitting introduction of unfiltered fluid into the inlet chamber, and an outlet chamber with an outlet permitting discharge of filtered fluid from the outlet chamber;
• cylindrical, structurally rigid filter means located in said filter housing between said inlet chamber and said outlet chamber, said filter means being rotatable within said filter housing about a central axis of said cylindrical filter means;
• a stationary backwash housing comprising at least one sliding shoe in contact, along a region parallel to the central axis of the cylindrical filter means, with an inlet side of said rotatable filter means, said sliding shoe having an elongate slit therethrough which provides communication between a substantial length of an inlet surface of said cylindrical filter means and an interior of said stationary backwash housing, said sliding shoe providing a virtually leakproof seal on the inlet side of the filter means thereby separating the interior of said stationary backwash housing and said inlet chamber;
• and
• means for providing sufficient retention of filtered fluid proximate at least a substantial portion of an outlet side surface of said filter means to allow substantially instantaneous and continuous backwashing of said filter means;
• whereby said stationary backwash housing provides continuous backwashing of said filter means over a rinsing area defined by the slit in said sliding shoe.

A backwash filter apparatus for removing solids from fluids, comprising:

• a first housing comprising an upper compartment defining an inlet chamber having an inlet permitting introduction of unfiltered fluid into the inlet chamber and a lower compartment defining an outlet chamber having an outlet permitting discharge of filtered fluid from the outlet chamber;
• stationary, filter means located in said filter housing and rigidly supported between said inlet chamber and said outlet chamber;
• an upper backwash housing comprising an upper elongate backwash hood which defines an upper backwash chamber proximate an inlet side of said filter means, said upper elongate backwash hood being rotatable about an axis normal to said filter means, said upper elongate backwash hood comprising a backwash outlet therein and at least one sliding shoe in contact with an inlet side of said filter means, said sliding shoe having a radially extending slit therethrough which provides communication between a substantial radially elongate area of said filter means and the interior of said upper backwash housing, said sliding shoe providing a virtually leakproof seal on the inlet side of the filter means thereby separating the interior of said backwash housing and said inlet chamber;
• and
• retention plate means for retaining filtered fluid in said outlet chamber at a location immediately proximate an outlet side of said retention plate filter means, said means comprising a lower backwash housing comprising a lower elongate backwash hood which defines a lower backwash chamber proximate an outlet side of said filter means, said lower backwash hood comprising at least one sliding shoe in contact with an outlet side of said filter means, said lower backwash hood being arranged in substantial axial alignment for synchronous rotation with said upper backwash hood;
• wherein the upper and lower backwash housings provide continuous backwashing of said filter means over a rinsing area defined by the slits in said sliding shoes.