Diesel exhaust fluid injector assembly

A diesel exhaust fluid (DEF) injector assembly for treatment of an exhaust stream, the DEF injector assembly comprising:

• an injector body comprising:
• a proximal end portion;
• a distal end portion;
• a longitudinal axis;
• a fluid inlet;
• a fluid outlet at the distal end portion, the fluid outlet in fluid communication with the exhaust stream;
• and
• a fluid pathway extending between the fluid inlet and the fluid outlet;
• and
• a shroud around the injector body that defines an air gap between the injector body and the exhaust stream.

An exhaust treatment system for an engine comprising:

• a housing having inlet for receiving an exhaust stream from the engine and an outlet for discharging the exhaust stream;
• a urea source;
• a fluid injector assembly having a longitudinal axis, the fluid injector assembly comprising:
• a fluid inlet in fluid communication with the urea source;
• a fluid outlet in fluid communication with the exhaust stream;
• and
• an impact structure having an impact surface in fluid communication with the fluid outlet, wherein at least a portion of the impact surface is inclined relative to the longitudinal axis;
• and
• a catalyst disposed downstream of the fluid injector assembly.