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US 12,473,851 B2Granted
Dosing and mixing assemblies for exhaust aftertreatment system
AssigneeDonaldson Company, Inc.
InventorsCorine Chauvin, Korneel De Rudder, Anil C. Agar, Bart Schellens
Life of this patent
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Abstract
A dosing and mixing assembly for an exhaust aftertreatment device includes a conduit arrangement defining overlapping, coaxial flow paths that join at a common flow path. The conduit arrangement defines a mixing region upstream of the overlapping, coaxial flow paths, an impact region at the overlapping, coaxial flow paths, and a merge region where the coaxial flow paths join. The outer of the coaxial flow paths insulates the inner of the flow paths at least as the impact region. Reactant can be dispensed into the inner flow path along a spray path that intersects the impact region of the conduit arrangement.
Claims17
A mixing assembly for use in an exhaust aftertreatment assembly, the mixing assembly comprising:
- a first conduit extending along a conduit axis from a first axial end to a second axial end to form a main flow path, the first conduit defining a bypass exit at the second axial end, the first conduit also defining an impact region disposed upstream of the bypass exit, the first conduit defining a continuous annular surface at the impact region, the first conduit defining a single circumferential row of a plurality of apertures positioned downstream of the impact region;
- a swirl mixer disposed at the first axial end of the first conduit, the swirl mixer being configured to induce swirling of exhaust flowing through the first conduit, the swirl mixer being disposed upstream of the impact region;
- a doser mounting location at the first axial end of the first conduit;
- and
- a second conduit surrounding at least a segment of the first conduit to form a bypass flow path between the first and second conduits, the second conduit being coaxial with the first conduit, the second conduit having a first axial end located downstream of the first axial end of the first conduit to form a bypass entrance downstream of the swirl mixer,
- wherein the bypass exit provides fluid communication between the bypass flow path and the main flow path to allow exhaust flowing through the bypass flow path to rejoin with exhaust flowing through the main flow path.
3 more elements
A mixing assembly for use in an exhaust aftertreatment assembly, the mixing assembly comprising:
- a first conduit extending along a conduit axis from a first axial end to a second axial end to form a main flow path, the first conduit defining a bypass exit at the second axial end, the first conduit also defining an impact region disposed upstream of the bypass exit, the first conduit defining a continuous annular surface at the impact region, the impact region continuing downstream to the second axial end;
- a swirl mixer disposed at the first axial end of the first conduit, the swirl mixer being configured to induce swirling of exhaust flowing through the first conduit, the swirl mixer being disposed upstream of the impact region;
- a doser mounting location at the first axial end of the first conduit;
- a second conduit surrounding at least a segment of the first conduit to form a bypass flow path between the first and second conduits, the second conduit being coaxial with the first conduit, the second conduit having a first axial end located downstream of the first axial end of the first conduit to form a bypass entrance downstream of the swirl mixer;
- and
- a spray path protector disposed at least partially upstream of the swirl mixer, the spray path protector including a perforated conduit disposed within the first conduit;
- wherein the bypass exit provides fluid communication between the bypass flow path and the main flow path to allow exhaust flowing through the bypass flow path to rejoin with exhaust flowing through the main flow path.
4 more elements
A mixing assembly for use in an exhaust aftertreatment assembly, the mixing assembly comprising:
- a first conduit extending along a conduit axis from a first axial end to a second axial end to form a main flow path, the first conduit defining a bypass exit at the second axial end, the first conduit also defining an impact region disposed upstream of the bypass exit, the first conduit defining a continuous annular surface at the impact region;
- a swirl mixer disposed at the first axial end of the first conduit, the swirl mixer being configured to induce swirling of exhaust flowing through the first conduit, the swirl mixer being disposed upstream of the impact region;
- a doser mounting location at the first axial end of the first conduit, the doser mounting location being positioned to orient a doser mounted thereto to dispense a reactant along a spray path intersecting the impact region of the first conduit such that a majority of reactant traveling along the spray path contacts the continuous annular surface at the impact region;
- and
- a second conduit surrounding at least a segment of the first conduit to form a bypass flow path between the first and second conduits, the second conduit being coaxial with the first conduit, the second conduit having a first axial end located downstream of the first axial end of the first conduit to form a bypass entrance downstream of the swirl mixer,
- wherein the bypass exit provides fluid communication between the bypass flow path and the main flow path to allow exhaust flowing through the bypass flow path to rejoin with exhaust flowing through the main flow path, wherein the bypass exit is defined by the second axial end of the first conduit terminating downstream of a second axial end of the second conduit.
3 more elements
Dependencies are inferred from the claim text.