Mixing pipe for SCR mufflers

An apparatus for treating exhaust comprising:

• a housing having an inlet and an outlet, the inlet in fluid communication with a source of exhaust, the housing defining a chamber;
• a mixing tube having at least two branches, wherein respective proximal ends of the at least two branches are connected to the inlet and a plurality of apertures is defined in respective walls of the at least two branches, distal ends of the at least two branches being connected by an end section, wherein the end section is curved and forms a 180 degree turn and the end section is devoid of apertures and closed to block the exhaust from being expelled through the end section;
• and
• a substrate disposed between the mixing tube and the outlet.

An apparatus for treating exhaust, comprising:

• a housing having a side wall, a top wall, and a bottom wall, the housing having an inlet and an outlet, the inlet in fluid communication with a source of exhaust gas;
• a mixing chamber in the housing in fluid communication with the inlet;
• a substrate chamber in the housing in fluid communication with the mixing chamber;
• an outlet chamber in the housing in fluid communication with the substrate chamber and the outlet;
• an inlet pipe connected to the inlet defined in the housing, wherein a center line of the housing extends through the inlet pipe and the mixing chamber;
• and
• a mixing loop in fluid communication with the inlet pipe, wherein the mixing loop comprises a first branch having a first linear portion positioned on a first side of the center line and a second branch having a second linear portion positioned opposite the first linear portion on a second side of the center line wherein the first and second linear portions are parallel with respect to one another and are connected to the inlet pipe and extend into the mixing chamber, and wherein the mixing loop comprises an end section extending between respective distal ends of the first branch and the second branch, wherein respective walls of the first and second linear portions have a plurality of apertures, and the end section is devoid of apertures to block the exhaust gas from moving from the mixing tube into the mixing chamber at the end section,
• wherein the inlet pipe and the mixing loop define a continuous flow path through the mixing chamber for the exhaust gas entering the housing via the inlet.