US 12,421,885 B2
Exhaust gas aftertreatment mixer
Eero Kotimäki, Oulunsalo (FI); and Aki Kärnä, Oulunsalo (FI)
Assigned to Proventia Oy, Oulunsalo (FI)
Filed by Proventia Oy, Oulunsalo (FI)
Filed on Oct. 28, 2024, as Appl. No. 18/928,231.
Application 18/928,231 is a continuation of application No. 18/544,598, filed on Dec. 19, 2023, granted, now 12,163,456.
Claims priority of application No. 20226155 (FI), filed on Dec. 22, 2022.
Prior Publication US 2025/0052184 A1, Feb. 13, 2025
Int. Cl. F01N 13/00 (2010.01); F01N 3/28 (2006.01)
CPC F01N 3/2892 (2013.01) [F01N 2240/20 (2013.01); F01N 2610/02 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A flow device for exhaust gas aftertreatment, comprising a mixing chamber comprising an input side and an output side;
a divider dividing the mixing chamber to the input side and the output side;
a mixing tube comprising a first end and a second end, and an intake section for receiving exhaust gas from the input side of the mixing chamber;
a swirl guide configured to guide the received exhaust gas to flow inside the mixing tube towards the second end as a rotating and advancing main flow; and
a reactant doser mount for a reactant doser; wherein
the divider comprises a first guide between the swirl guide and the output side of the mixing chamber;
the first guide comprises at least one concave shape, the concave shape being visible on both sides of the mixing tube when seen from the input side in the direction in which the exhaust gas is received at the input side, the concave shape being configured to form a convex shape form on the output side providing more space on the output side for spreading exhaust gas flow into a next processing phase;
the mixing tube comprises a dosing section between the intake section and the second end;
the mixing tube is configured to guide the exhaust gas received by the intake section through the divider towards the second end of the mixing tube;
the dosing section is configured to receive at least most of the rotating and advancing exhaust gas flow; and
the reactant doser mount is configured for mounting the reactant doser such that when in use, the reactant doser provides reactant to the dosing section.