Fluid filter with pleated septum
AssigneeH-Tech, Inc.
InventorDonald R. Davidson
Life of this patent
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Abstract
A device for filtering fluid includes a hollow housing having a fluid inlet and a fluid outlet. A filter element formed of fluid permeable material is disposed within the housing for filtering fluid entering the fluid inlet, the fluid passing through the element and out the fluid outlet. The element has a generally cylindrical configuration with the permeable material forming a plurality of elongated, radially extending pleats. The pleats are supported by spacers having a plurality of blades attached to a web with channels therebetween. The element is used as a septum for supporting a diatomaceous earth precoat. A regeneration piston creates fluid flows within the filter that cause the element to flutter, thereby displacing DE precoat from the septum for regeneration.
Claims31
A fluid filter, comprising:
- (a) A hollow housing having a fluid inlet and a fluid outlet;
- and
- (b) a filter element formed of fluid permeable material disposed within said housing for filtering fluid entering said fluid inlet passing through said element and out said fluid outlet, said element having a generally cylindrical configuration with an axial hollow, said permeable material forming a plurality of elongated, radially extending pleats, each of said pleats having a pair of side walls terminating proximate said axial hollow, each of said pleats spaced from an adjacent said pleat where said side walls terminate proximate said axial hollow, said fluid permeable material extending between adjacent pleats and constituting a portion of the filter element for filtering fluid.
A diatomaceous earth filter, comprising:
- (a) a hollow housing having a fluid inlet and a fluid outlet;
- (b) a filter septum of flexible, fluid permeable material for supporting a precoat of diatomaceous earth and disposed within said housing for filtering a pressurized stream of fluid entering said fluid inlet, passing through said precoat and said septum and out said fluid outlet, said filter septum being a generally cylindrical, pleated cartridge with a perforated core cylinder, each seat of said pleated cartridge having a pair of side walls terminating proximate said core cylinder, each of said pleats spaced from an adjacent said pleat where said side walls terminate proximate said core cylinder, said fluid permeable material extending between adjacent pleats and constituting a portion of the filter element for filtering fluid;
- and
- (c) a piston axially reciprocable within said core cylinder to simultaneously induce flows out of said core cylinder through said perforations in areas approached by said piston and into said core cylinder in areas from which said piston retreats when said piston is reciprocated creating a media regenerative flow of fluid within said filter distinct from said flow attributable to said pressurized stream, said media regenerative flow disturbing said precoat on said septum at least in part by bending said flexible septum.
Dependencies are inferred from the claim text.