Reverse flow air filter arrangement and method
AssigneeDonaldson Company, Inc.
InventorDonald Francis Engel
Life of this patent
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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.
Claims20
An air filter element comprising:
- (a) a first end cap having an air inlet opening therein;
- (b) a second end cap;
- (c) a cylindrical extension of filter media defining an open filter interior and having an inside diameter, the filter media being potted within the first and second end caps;
- (d) an inner support liner;
- (e) an outer support liner;
- (f) the second end cap having:
- (i) a central drainage aperture, said central drainage aperture being substantially smaller than the inside diameter of the filter media;
- and,
- (g) an interior surface positioned within said open filter interior and constructed and arranged to funnel moisture to said central drainage aperture;
- said interior surface extending between said inner support liner and said central drainage aperture, on an opposite side of said inner support liner from said filter media.
An air filter comprising:
- (a) first and second, opposite, end caps;
- (b) cylindrical filter media potted within, and extending between, the first and second, opposite, end caps;
- (i) said filter media defining an open filter interior;
- (c) said first end cap being an open airflow inlet;
- (d) said second end cap comprising molded polymeric material and having an outer surface;
- (i) said second end cap having a circular sealing trough in said outer surface;
- (ii) said circular sealing trough having a smaller diameter than an inside diameter of said cylindrical filter media.
An air filter element comprising:
- (a) a first end cap having an air inlet opening therein;
- (b) a second end cap;
- (c) a cylindrical extension of filter media defining an open filter interior and having an inside diameter;
- the filter media being potted within the first and second end caps;
- (d) an inner support liner;
- (e) a central drainage aperture extending through the second end cap;
- said central drainage aperture being substantially smaller than the inside diameter of the filter media;
- and,
- (f) an inner surface positioned within said open filter interior;
- said inner surface comprising a lower surface closing a lower end of said open filter interior, when said filter element is positioned within said first end cap positioned vertically over said second end cap;
- (i) said inner surface comprising an interior funnel surface constructed and arranged to direct moisture to said central drainage aperture, in use;
- said inner surface extending between said inner support liner and said central drainage aperture, on an opposite side of said inner support liner from said filter media.
Dependencies are inferred from the claim text.