Mixer and Exhaust Aftertreatment System

An exhaust aftertreatment system, comprising a mixer and a doser, wherein the mixer comprises:

• an exhaust intake channel, and the side wall of the exhaust intake channel comprising an injection opening, and the exhaust intake channel providing a first mixing chamber;
• a flow distributor positioned in the first mixing chamber and comprising a first flow path area and a second flow path area;
• a first endcap;
• a second endcap;
• a deflector;
• wherein the first endcap and the second endcap are set to be oppositely closed to form a second mixing chamber, and the second mixing chamber comprises an inlet portion and an outlet portion that are not concentrically arranged, and the inlet portion is connected to the first mixing chamber, and the deflector is positioned at the second mixing chamber, and the first flow path area, the deflector and the side wall of the outlet portion form a first flow path, and the second flow path area and the side wall of the second mixing chamber form a second flow path, and the downstream end of the first flow path and the downstream end of the second flow path merge at the outlet portion of the second mixing chamber;
• and the doser can inject a reducing agent solution through the injection opening into the exhaust intake channel.