US Patent 9352276 Exhaust mixing device

A swirl device for intermixing a reagent exhaust treatment fluid and an exhaust produced by an engine. The swirl device includes a cylindrical tube defining an inlet for receipt of the reagent exhaust treatment fluid and the exhaust, and a swirl member attached to the cylindrical tube. The swirl member conically expands outward from the cylindrical tube and includes a plurality of tabs separated by elongate slots. The plurality of tabs are configured to swirl and intermingle the reagent exhaust treatment fluid and the exhaust.