Dosing and mixing arrangement for use in exhaust aftertreatment
AssigneeDonaldson Company, Inc.
InventorsMatthew S. WHITTEN, Bruce Bernard HOPPENSTEDT
Life of this patent
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Abstract
Dosing and mixing exhaust gas includes directing exhaust gas towards a periphery of a mixing tube that is configured to direct the exhaust gas to flow around and through the mixing tube to effectively mix and dose exhaust gas within a relatively small area. Some mixing tubes include a slotted region and a non-slotted region. Some mixing tubes include a louvered region and a non-louvered region. Some mixing tubes are offset within a mixing region of a housing.
Claims20
A mixing tube arrangement for swirling exhaust gases, the mixing tube arrangement comprising:
- a tube body having a longitudinal axis extending along an interior passage from a first end of the tube body to a second end of the tube body, the tube body defining a slotted region and a non-slotted region, the slotted region defining a plurality of slots, the slotted region extending over a first circumferential distance of the tube body and the non-slotted region extending over a second circumferential distance of the tube body, the second circumferential distance being less than the first circumferential distance;
- and
- a plurality of louvers disposed at the slots.
A dosing and mixing arrangement comprising:
- a housing defining an inlet having an inlet axis, a mixing region, and an outlet having an outlet axis, the outlet axis being generally orthogonal to the inlet axis;
- a mixing tube arrangement disposed within the mixing region of the housing, the mixing tube arrangement including a tube body defining an interior passage that extends along the outlet axis, the tube body having a circumferential surface extending across the inlet axis, the circumferential surface having a louvered region and a non-louvered region, the louvered region defining a plurality of louvers extending outwardly from a circumferential surface of the tube body, the non-louvered region being free of louvers, the tube body also defining a plurality of slots that extend through the circumferential surface of the tube body, each louver being associated with at least one slot.
Dependencies are inferred from the claim text.