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.
Claims19
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;
- a housing disposed about a first section of the tube body while a second section of the tube body is disposed external of the housing, the housing defining an inlet providing flow communication between the interior of the housing and an exterior of the housing, the longitudinal axis of the tube body being angled relative to a flow direction of gas entering the housing through the inlet;
- and
- a plurality of louvers disposed at the slots, wherein the slotted region extends along 210° to 330° of a circumference of the tube body.
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 angled relative to the inlet axis;
- a mixing tube arrangement including a tube body defining an interior passage that extends along the outlet axis, the tube body having a length extending along the interior passage, 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 tube body having a first portion of the length disposed within the housing at the mixing region and a second portion of the length disposed external of the tube body, the first portion including the louvered and non-louvered regions, the first portion being larger than the second portion, 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, wherein the slotted region extends along 210° to 330° of a circumference of the tube body.
Dependencies are inferred from the claim text.