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.
Claims21
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 continuous circumferential distance of the tube body and the non-slotted region extending over a second continuous circumferential distance of the tube body, the second circumferential distance being less than the first circumferential distance, and the second continuous circumferential distance being larger than a circumferential distance of any portion of the tube body extending between two adjacent slots at the slotted region, and the width of each slot being less than half of the second continuous 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 continuous louvered region and a continuous 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 non-louvered region having a circumferential width that is larger than a circumferential width of a portion of the tube body extending between two adjacent louvers at the louvered region, 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, each slot having a common width defined along a circumference of the tube body.
Dependencies are inferred from the claim text.