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US 5,613,992 AGranted
Reverse flow air filter arrangement and method
AssigneeDonaldson Company, Inc.
InventorDonald F. Engel
Life of this patent
Estimating the term…
Abstract
A reverse flow air filter arrangement is provided. The arrangement includes a filter element having first and second end caps, the second end cap having a central drainage aperture. A funnel shape on an interior surface of second end cap is used to direct moisture flow to the drainage aperture. The arrangement includes a housing in which the filter element is positioned, operatively, during use. Certain features in the housing facilitate moisture withdrawal from the filter element while also inhibiting interference with sealing between the filter element and the housing.
Claims19
An air filter arrangement comprising:
- (a) a housing;
- (b) air filter element having:
- first and second, opposite, end caps;
- filter media;
- and, an open filter interior;
- (i) said first end cap having an air inlet opening therein;
- (ii) said second end cap having:
- (A) a central drainage aperture;
- and,
- (B) an interior surface constructed and arranged to funnel moisture on said second end cap interior surface to said central drainage aperture;
- (c) an air flow direction arrangement constructed and arranged to direct air flow:
- into said housing;
- into said open filter interior;
- through said filter media;
- and, outwardly from said housing;
- (d) said filter element second end cap is a sheet metal end cap;
- (e) said housing includes a base having a central pan with a central drainage aperture;
- and,
- (f) a primary seal gasket is axially compressed between said second end cap and said base, when said air filter arrangement is operationally assembled.
16 more elements
An air filter arrangement comprising:
- (a) a housing;
- (b) air filter element having:
- first and second, opposite, end caps;
- filter media potted within the first and second end caps;
- and, an open filter interior;
- (i) said first end cap having an air inlet opening therein;
- (ii) said second end cap having:
- (A) a central drainage aperture;
- said aperture being substantially smaller than an inside diameter of the filter element;
- and,
- (B) an interior surface with an outer region;
- said interior surface being angled from the outer region toward the central drainage aperture and constructed and arranged to funnel moisture on said second end cap interior surface to said central drainage aperture;
- and,
- (c) an air flow direction arrangement constructed and arranged to direct air flow:
- into said housing;
- into said open filter interior;
- through said filter media;
- and, outwardly from said housing.
15 more elements
An air filter arrangement comprising:
- (a) a housing;
- (b) air filter element having:
- first and second, opposite, end caps;
- filter media;
- and, an open filter interior;
- (i) said first end cap having an air inlet opening therein;
- (ii) said second end cap having:
- (A) a central drainage aperture;
- and,
- (B) an interior surface constructed and arranged to funnel moisture on said second end cap interior surface to said central drainage aperture;
- and including a plurality of radially directed troughs therein which terminate at said central drainage aperture;
- and,
- (c) an air flow direction arrangement constructed and arranged to direct air flow:
- into said housing;
- into said open filter interior;
- through said filter media;
- and, outwardly from said housing.
14 more elements
An air filter arrangement comprising:
- (a) a housing;
- (b) air filter element having:
- first and second, opposite, end caps;
- filter media;
- and, an open filter interior;
- (i) said first end cap having an air inlet opening therein;
- (ii) said second end cap having:
- (A) a central drainage aperture;
- (B) an interior surface constructed and arranged to funnel moisture on said second end cap interior surface to said central drainage aperture;
- and,
- (C) an outer, annular, compressible portion;
- (c) an air flow direction arrangement constructed and arranged to direct air flow:
- into said housing;
- into said open filter interior;
- through said filter media;
- and, outwardly from said housing;
- and
- (d) said housing includes an annular sealing surface against which said second end cap outer, annular, compressible portion is sealed, when said air filter arrangement is operatively assembled, for use.
15 more elements
Dependencies are inferred from the claim text.