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US 11,465,108 B2Granted
Dosing and mixing arrangement for use in exhaust aftertreatment
AssigneeDonaldson Company, Inc.
InventorsMatthew S. Whitten, Bruce Bernard Hoppenstedt
Life of this patent
Estimating the term…
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
An exhaust treatment system comprising:
- a housing defining an interior bounded by an interior surface of the housing, the housing also defining a doser mounting location;
- an inlet leading into the interior of the housing;
- an outlet leading out of the interior of the housing, the outlet opposing the doser mounting location;
- a conduit coupled to the housing, the conduit having an annular exterior surface formed about a conduit axis and extending between opposite first and second ends, the first end of the conduit being coupled to the housing at the doser mounting location, the conduit being oriented relative to the housing so that the conduit axis extends through the outlet, the conduit having a louvered section and a non-louvered section disposed within the interior of the housing, the louvered section including a plurality of louvers disposed along a first continuous circumferential distance of the annular exterior surface, each of the louvers being disposed at a respective slot, the non-louvered section extending along a second continuous circumferential distance of the annular exterior surface that combined with the first continuous circumferential distance forms a full circumference of the annular exterior surface, the second continuous circumferential distance being larger than a circumferential distance of any of the slots and any space between the slots, the annular exterior surface being spaced from the interior surface of the housing about the full circumference to define a continuous open volume extending around the conduit, wherein the conduit is solid around a full circumference of the conduit at the outlet, and wherein the slotted region extends 200° to 350° around the conduit.
1 more element
An exhaust treatment system comprising:
- a housing defining an interior, the housing defining an inlet leading into the interior along an inlet axis;
- and
- a conduit having a first portion disposed within the interior of the housing and a second portion external of the housing, the first portion being larger than the second portion, the conduit having an annular surface surrounding a conduit axis that extends between opposite first and second axial ends of the conduit, the first portion of the conduit defining an exhaust flow entrance region through the annular surface of the conduit, the second portion of the conduit defining an exhaust flow exit through the second axial end of the conduit, the exhaust flow exit being non-parallel with the inlet of the housing, the exhaust flow entrance region including a plurality of slots, the exhaust flow entrance region having a length extending along the conduit axis, wherein a ratio of the length of the exhaust flow entrance region and a diameter of the conduit is 1 to 3, and the first portion of the conduit also including a non-slotted region at a common axial location along the conduit axis as the exhaust flow entrance region, the non-slotted region being circumferentially spaced from the exhaust flow entrance region, the non-slotted region having a larger circumferential distance than any individual one of the slots at the exhaust flow entrance region and any space between the slots, and the slotted region extends 200° to 350° around the conduit.
Dependencies are inferred from the claim text.