US 12,473,851 B2
Dosing and mixing assemblies for exhaust aftertreatment system
Corine Chauvin, Caen (FR); Korneel De Rudder, Winksele (BE); Anil C. Agar, Leuven (BE); and Bart Schellens, Overijse (BE)
Assigned to Donaldson Company, Inc., Bloomington, MN (US)
Filed by Donaldson Company, Inc., Bloomington, MN (US)
Filed on Sep. 28, 2023, as Appl. No. 18/476,989.
Application 18/476,989 is a continuation of application No. 17/642,620, granted, now 11,773,763, previously published as PCT/US2020/040293, filed on Jun. 30, 2020.
Claims priority of provisional application 62/971,344, filed on Feb. 7, 2020.
Claims priority of application No. 19197416 (EP), filed on Sep. 13, 2019.
Prior Publication US 2024/0018890 A1, Jan. 18, 2024
Int. Cl. F01N 3/28 (2006.01); F01N 3/20 (2006.01)
CPC F01N 3/2892 (2013.01) [F01N 3/2066 (2013.01); F01N 2240/20 (2013.01); F01N 2470/02 (2013.01); F01N 2470/04 (2013.01); F01N 2470/08 (2013.01); F01N 2470/24 (2013.01); F01N 2610/02 (2013.01); F01N 2610/1453 (2013.01)] 17 Claims
OG exemplary drawing
 
1. 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.