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US 6,673,136 B2Granted
Air filtration arrangements having fluted media constructions and methods
AssigneeDonaldson Company, Inc.
InventorsGary R. Gillingham, Mark A. Gogins, Thomas M. Weik
Life of this patent
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Abstract
Filter arrangements include a barrier media in the form of fluted media treated with a deposit of fine fibers. The media is particularly advantageous in high temperature (greater than 140 to 240° F.) systems. Such systems may include engine systems, gas turbine systems, and fuel cell systems. Filter arrangements may take the form of media packs having a circular cross-section or a racetrack shaped cross-section, or media packs formed in a panel configuration.
Claims60
A filter element arrangement comprising:
- (a) a media pack having a substrate, said substrate comprising a filtration efficiency measured under ASTM 1215-89 with 0.78 μmonodisperse polystyrene spherical particles, at 20 fpm, and a basis weight of less than about 200 grams-m−2, said substrate comprising first and second opposite flow faces and a plurality of flutes, wherein in said media pack;
- (i) each of said flutes have a first end portion adjacent to said first flow face and a second end portion adjacent to said second flow face;
- (ii) selected ones of said flutes being open at said first end portion and closed at said second end portion;
- and selected ones of said flutes being closed at said first end portion and open at said second end portion;
- and
- (iii) said substrate comprising a surface that is at least partially covered by a layer comprising fine fiber comprising a fiber with a diameter of about 0.01 to 0.5 microns such that the fiber, when tested under conditions of exposure for a test period of 16 hours to test conditions of 140° F. air at a relative humidity of 100%, retains greater than 30% of the fiber unchanged for filtration purposes.
3 more elements
A method for filtering air, the method comprising:
- (a) directing the air through a media pack at a rate of 5 to 10,000 cfm, the pack comprising a substrate having first and second opposite flow faces, the substrate comprising a filtration efficiency measured under ASTM 1215-89 with 0.78 μ monodisperse polystyrene spherical particles, at 20 fpm, and a basis weight of less than about 200 grams-m−2 said substrate comprising a plurality of flutes, wherein in said media pack;
- (i) said flutes have a first end portion adjacent to the first flow face and a second end portion adjacent to the second flow face;
- (ii) selected ones of the flutes being open at the first end portion and closed at the second end portion;
- and selected ones of the flutes being closed at the first end portion and open at the second end portion;
- (iii) the media composite including substrate comprising a surface that is at least partially covered by a layer comprising fine fiber comprising a fiber with a diameter of about 0.01 to 0.5 microns such that the fiber, when tested under conditions of exposure for a period of 16 hours to test conditions of 140° F. air at a relative humidity of 100%, retains greater than 30% of the fiber unchanged for filtration purposes.
2 more elements
Dependencies are inferred from the claim text.