Concentric-tube diesel particulate filter
AssigneeMinnesota Mining and Manufacturing Company
InventorRichard P. Merry
Life of this patent
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Abstract
An efficient, economical, compact diesel particulate filter comprising a casing with a plurality of concentric, spaced, perforated, supported, substantially rigid tubes substantially filling the casing radially, wherein the perforated surface of each tube is covered by a filtering element comprising substantially helically wound inorganic yarn, wherein each space between tubes is blocked at only one end of the tubes so that exhaust entering an unblocked space at one end of the casing passes radially inwardly and outwardly through filtering elements before exiting through an unblocked space at the other end of the casing.
Claims22
A diesel particulate filter comprising
- (a) a casing having at least two ends;
- (b) means for connecting said ends of said casing to an exhaust system;
- (c) a plurality of concentric, spaced, perforated, supported, substantially rigid tubes extending between said ends of said casing, each of said tubes having at least two ends and an outer surface, and said plurality of tubes substantially filling said casing radially;
- (d) filtering elements comprising inorganic yarn, said inorganic yarn being substantially helically wound around each of said tubes to cover said perforations;
- and
- (e) means for blocking alternate spaces between said tubes at ends of said tubes, with each space between said tubes being blocked adjacent to one of said ends of said casing.
A diesel particulate filter comprising
- (a) a casing having at least two ends;
- (b) means for connecting said ends of said casing to an exhaust system;
- (c) a plurality of concentric, spaced, perforated, supported, substantially rigid tubes extending between said ends of said casing, each of said tubes having at least two ends and an outer surface, and said plurality of tubes substantially filling said casing radially;
- (d) filtering elements comprising ceramic yarn, said ceramic yarn being substantially helically wound around each of said tubes to cover said perforations, said ceramic yarn being a texturized ply-twisted ceramic yarn having at least one of fiber segments and loops of continuous fibers protruding outwardly from a dense core to provide traps for exhaust particles, and said ceramic yarn being substantially cross-wound about at least one of said tubes;
- and
- (e) means for blocking alternate spaces between said tubes at ends of said tubes, with each spaced between said tubes being blocked adjacent to one of said ends of said casing.
Dependencies are inferred from the claim text.