Fluid filter with canted fanfold pleats
First Claim
1. A fanfold filter element comprising a plurality of canted pleats of a fluid filtering media, each pleat having opposite sidewalls on opposite sides of a fold forming a pocket of the pleat, and said plurality of pleats having alternating folds forming adjacent pockets with openings facing in opposite directions, said opposite sidewalls having different heights so that a central plane equidistant therebetween is canted at an angle substantially less than 90 degrees relative to a plane tangent to an outer surface of the folds of said pleats on one side of said filter element;
- and securing means for securing said canted pleats together to maintain said cant angle, the cant angle of said canted filter element being sufficient to substantially increase a surface area of the filtering media as compared to a surface area of the same filtering media in a non-canted filter element having pleats formed with opposite sidewalls equidistant from a central plane that is at an angle of 90 degrees relative to said tangent plane, where the overall depths of said canted and non-canted filtering elements are substantially the same.
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Abstract
Fanfold filter element has filtering media pleats canted at a predetermined angle relative to a reference plane such that the depth of each pleat is greater than the depth of a mounting frame to increase effective filtering area. The frame is canted by a corresponding amount so that central planes of pleat pockets are aligned with the direction of incoming fluid flow.
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Citations
20 Claims
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1. A fanfold filter element comprising a plurality of canted pleats of a fluid filtering media, each pleat having opposite sidewalls on opposite sides of a fold forming a pocket of the pleat, and said plurality of pleats having alternating folds forming adjacent pockets with openings facing in opposite directions, said opposite sidewalls having different heights so that a central plane equidistant therebetween is canted at an angle substantially less than 90 degrees relative to a plane tangent to an outer surface of the folds of said pleats on one side of said filter element;
- and securing means for securing said canted pleats together to maintain said cant angle, the cant angle of said canted filter element being sufficient to substantially increase a surface area of the filtering media as compared to a surface area of the same filtering media in a non-canted filter element having pleats formed with opposite sidewalls equidistant from a central plane that is at an angle of 90 degrees relative to said tangent plane, where the overall depths of said canted and non-canted filtering elements are substantially the same.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A fanfold filter element comprising a plurality of canted pleats of a fluid filtering media, each pleat having opposite sidewalls on opposite sides of a fold forming a pocket of the pleat, and said plurality of pleats having alternating folds forming adjacent pockets with openings facing in opposite directions, said opposite sidewalls being substantially parallel and having different heights so that they are canted at an angle substantially less than 90 degrees relative to a plane tangent to an outer surface of the folds of said pleats on one side of said filter element;
- and securing means for securing said canted pleats together to maintain said cant angle, the cant angle of said canted filter element being sufficient to substantially increase a surface area of the filtering media as compared to a surface area of the same filtering media in a non-canted filter element having pleats formed with opposite sidewalls at an angle of 90 degrees relative to said tangent plane, where the overall depths of said canted and non-canted filtering elements are substantially the same.
- View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
Specification