Air filter assembly for filtering an air stream to remove particulate matter entrained in the stream
First Claim
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1. An air filter assembly comprising:
- (a) a housing including an air inlet, an air outlet, a spacer wall separating said housing into a filtering chamber and a clean air chamber;
said spacer wall including a first air flow aperture therein;
(b) a first filter construction positioned in air flow communication with said first air flow aperture in said spacer wall;
said first filter construction including an extension of a pleated filter media composite defining a filter construction inner clean air chamber;
(i) said first filter construction being oriented with said filter inner clean air chamber in air flow communication with said spacer wall first air flow aperture;
(ii) said pleated filter media composite including a substrate, the substrate having an efficiency greater than 11% when measured according to ASTM-1215-89, with 0.78μ
monodisperse polystyrene spherical particles, at 20 fpm (6.1 meters/min), a permeability of about 2 to 900 meters-min−
1, a basis weight not greater than 200 grams-m−
2 and a thickness of 25 to 800 microns, the substrate at least partially covered by a layer of fine fiber having a thickness of about 1-8 times the fine fiber diameter;
(A) said fiber comprising a diameter of about 0.01 to 0.5 microns that after exposure for a test period of 16 hours to test conditions of 140°
F. air and a relative humidity of 100% retains greater than 30% of the fiber unchanged for filtration purposes (c) a pulse-jet cleaning system oriented to direct a pulse of air into said filter construction inner clean air chamber.
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Accused Products
Abstract
Filter arrangements for industrial air cleaners include a barrier media, usually pleated, treated with a deposit of fine fiber. The media is particularly advantageous in high temperature (greater than 140° F.) operating environments.
224 Citations
53 Claims
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1. An air filter assembly comprising:
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(a) a housing including an air inlet, an air outlet, a spacer wall separating said housing into a filtering chamber and a clean air chamber;
said spacer wall including a first air flow aperture therein;
(b) a first filter construction positioned in air flow communication with said first air flow aperture in said spacer wall;
said first filter construction including an extension of a pleated filter media composite defining a filter construction inner clean air chamber;
(i) said first filter construction being oriented with said filter inner clean air chamber in air flow communication with said spacer wall first air flow aperture;
(ii) said pleated filter media composite including a substrate, the substrate having an efficiency greater than 11% when measured according to ASTM-1215-89, with 0.78μ
monodisperse polystyrene spherical particles, at 20 fpm (6.1 meters/min), a permeability of about 2 to 900 meters-min−
1, a basis weight not greater than 200 grams-m−
2 and a thickness of 25 to 800 microns, the substrate at least partially covered by a layer of fine fiber having a thickness of about 1-8 times the fine fiber diameter;
(A) said fiber comprising a diameter of about 0.01 to 0.5 microns that after exposure for a test period of 16 hours to test conditions of 140°
F. air and a relative humidity of 100% retains greater than 30% of the fiber unchanged for filtration purposes(c) a pulse-jet cleaning system oriented to direct a pulse of air into said filter construction inner clean air chamber. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47)
(a) a first Venturi element mounted in said spacer wall first air flow aperture and positioned to project into said first filter construction inner clean air chamber; and
wherein(i) said pulse-jet cleaning system includes a first blowpipe oriented to direct a pulse of air into said first Venturi element from said clean air chamber and toward said first filter construction.
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44. An air filter assembly according to claim 1 wherein:
(a) said first filter construction includes a first end cap having a central aperture;
said extension of filter media being embedded within said first end cap.
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45. An air filter assembly according to claim 1 wherein:
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(a) said first filter construction includes first and second filter elements in axial alignment;
(i) said extension of a pleated filter media composite comprising a first extension of media in said first filter element and a second extension of media in said second filter element.
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46. An air filter assembly according to claim 1 wherein:
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(a) said spacer wall includes a second air flow aperture therein; and
wherein the assembly further includes;
(i) a second filter construction positioned in air flow communication with said second air flow aperture in said spacer wall;
said second filter construction including an extension of a pleated filter media composite defining a second filter construction inner clean air chamber;
(A) said second filter construction being oriented with said second filter inner clean air chamber in air flow communication with said spacer wall second air flow aperture; and
(B) said pleated filter media composite of said second filter construction including a substrate at least partially covered by a layer of fine fiber.
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47. An air filter assembly according to claim 1 wherein:
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(a) said spacer wall includes a second air flow aperture therein; and
wherein the assembly further includes;
(i) a second filter construction positioned in air flow communication with said second air flow aperture in said spacer wall;
said second filter construction including an extension of a pleated filter media composite defining a second filter construction inner clean air chamber;
(A) said second filter construction being oriented with said second filter inner clean air chamber in air flow communication with said spacer wall second air flow aperture; and
(B) said pleated filter media composite of said second filter construction including a substrate at least partially covered by a layer of fine fiber;
(ii) a second Venturi element mounted in said spacer wall second air flow aperture and positioned to project into said second filter construction inner clean air chamber, and (iii) a second blowpipe oriented to direct a pulse of air into said second Venturi element from said clean air chamber and toward said second filter construction.
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48. A method for filtering air;
- the air having a temperature of at least 140°
F.;
the method comprising;(a) directing the air through an inlet of a housing and into a filtering chamber;
the housing including a spacer wall separating the filtering chamber from a clean air chamber;
the spacer wall including a first air flow aperture therein;
(b) alter directing the air into the filtering chamber, directing the air through an extension of a pleated filter media composite of a first filter construction and into a filter construction inner clean air chamber;
the first filter construction being positioned in air flow communication with the first air flow aperture in the spacer wall;
the extension of a pleated filter media composite defining the filter construction inner clean air chamber;
(i) the first filter construction being oriented with the filter inner clean air chamber in air flow communication with the spacer wall first air flow aperture;
(ii) the media composite including a substrate, the substrate having an efficiency greater than 11% when measured according to ASTM-1215-89, with 0.78μ
monodisperse polystyrene spherical particles, at 20 fpm (6.1 meters/min), a permeability of about 2 to 900 meters-min−
1, a basis weight not greater than 200 grams-m−
2 and a thickness of 25 to 800 microns, the substrate at least partially covered by a layer said layer comprising fine fiber comprising a fiber with a diameter of about 0.1 to 0.5 microns, the layer having a thickness of about 1-8 times the fine fiber diameter, such that after exposure for a test period of 16 hours to test conditions of 140°
F. air and a relative humidity of 100% retains greater than 30% of the fiber unchanged for filtration purposes; and
(c) after directing the air through an extension of a pleated filter media composite of at first filter construction end into a filter construction inner clean air chamber, directing the air into the clean air chamber and out of the housing. - View Dependent Claims (49, 50, 51, 52, 53)
particulates collected on each of the pleated filter media composite includes directing the pulse of air into a plurality of Venturi elements each mounted to project into a respective filter construction inner clean air chamber.
- the air having a temperature of at least 140°
Specification