Mixers for exhaust aftertreatment systems

A mixer for an exhaust aftertreatment system, the mixer comprising:

• a mixer body centered on a mixer axis and positioned such that an injection axis of an injector of a dosing module extends into the mixer body, the mixer body configured to receive exhaust and treatment fluid;
• a plurality of apertures extending through the mixer body, each of the apertures being elongated in a direction that extends at an aperture angle relative to a reference axis that is parallel to the mixer axis, each of the apertures configured to facilitate flow of the exhaust through the mixer body, and each of the apertures comprising:
• a first edge, and
• a second edge perpendicular to the first edge and contiguous with the first edge;
• and
• a plurality of blades, each of the blades coupled to the mixer body along a portion of one of the apertures, each of the blades extending radially inward from the mixer body at an angle between 15 degrees and 85 degrees from the mixer body;
• wherein the reference axis extends through:
• (i) an intersection between the first edge and the second edge of one of the apertures and (ii) an intersection between the first edge and the second edge of another of the apertures.

A mixer for an exhaust aftertreatment system, the mixer comprising:

• a mixer body positioned such that an injection axis of an injector of a dosing module extends into the mixer body, the mixer body configured to receive exhaust and treatment fluid;
• a plurality of apertures extending through the mixer body, each of the apertures configured to facilitate flow of the exhaust and the treatment fluid through the mixer body, each of the apertures comprising a first edge, a second edge opposite of the first edge, a third edge extending between the first edge and the second edge, and a fourth edge opposite of the third edge and extending between the first edge and the second edge;
• a plurality of blades, each of the blades coupled to the mixer body along the first edge of one of the apertures, each of the blades extending radially outward from the mixer body, each of the blades comprising:
• a first portion coupled to the first edge and angled at a first opening angle away from the mixer body, the first portion contiguous with the mixer body, and
• a second portion coupled to the first edge and angled at a second opening angle away from the mixer body, the second portion contiguous with the mixer body, the second opening angle being different from the first opening angle;
• and
• a first end comprising:
• a plurality of tabs, and
• a plurality of edge slots, each of the edge slots positioned between two of the tabs.

A mixer for an exhaust aftertreatment system, the mixer comprising:

• a mixer body positioned such that an injection axis of an injector of a dosing module extends into the mixer body, the mixer body configured to receive exhaust and treatment fluid, the mixer body centered on a mixer axis;
• a plurality of apertures extending through the mixer body, each of the apertures configured to facilitate flow of the exhaust and the treatment fluid through the mixer body;
• a plurality of blades, each of the blades coupled to the mixer body along a portion of one of the apertures, each of the blades extending radially outward from the mixer body;
• a first end comprising:
• a plurality of tabs, and
• a plurality of edge slots, each of the edge slots positioned between two of the tabs;
• and
• a second end opposite the first end, the second end comprising a flange extending radially outward from the mixer body, the flange comprises a mixer body edge contiguous with the mixer body and an outlet edge, wherein:
• L
• =
• (
• R
• 1
• ⁢
• f
• -
• R
• 2
• ⁢
• f
• )
• /
• sin
• ⁡
• (
• θ
• )
• ,
• L is a length of the flange measured along the flange between the mixer body edge of the flange and the outlet edge of the flange,
• R1f is a first flange radius measured from the mixer axis to the outlet edge of the flange and 0.04 meters≤R1f≤0.08 meters,
• R2f is a second flange radius measured from the mixer axis to the mixer body edge of the flange and is of the form R2f=R1e/α,
• R1e is a first end radius measured from the mixer axis to the first end of the mixer and 0.02 meters≤R1e≤0.05 meters,
• α is a radius ratio and 0.06≤α≤0.09, and
• θ is a flange angle measured relative to the mixer axis and 15 degrees≤θ≤50 degrees.

A mixer for an exhaust aftertreatment system, the mixer comprising:

• a mixer body positioned such that an injection axis of an injector of a dosing module extends into the mixer body, the mixer body configured to receive exhaust and treatment fluid;
• a plurality of apertures extending through the mixer body, each of the apertures configured to facilitate flow of the exhaust and the treatment fluid through the mixer body;
• a plurality of blades, each of the blades coupled to the mixer body along a portion of one of the apertures, each of the blades extending radially outward from the mixer body;
• a first end comprising:
• a plurality of tabs, and
• a plurality of edge slots, each of the edge slots positioned between two of the tabs;
• a second end opposite the first end;
• a first plate coupled to the second end and extending radially outward from the second end;
• and
• a second plate coupled to the second end and extending radially outward from the second end, wherein the first plate, the second plate, and the second end define a plate channel configured to facilitate flow of the exhaust therethrough such that the plate channel is only defined by the first plate, the second plate, and the second end.

A mixer for an exhaust aftertreatment system, the mixer comprising:

• a mixer body positioned such that an injection axis of an injector of a dosing module extends into the mixer body, the mixer body configured to receive exhaust and treatment fluid;
• a plurality of apertures extending through the mixer body, each of the apertures configured to facilitate flow of the exhaust and the treatment fluid through the mixer body;
• a plurality of blades, each of the blades coupled to the mixer body along a portion of one of the apertures, each of the blades extending radially outward from the mixer body;
• a first end comprising:
• a plurality of tabs, and
• a plurality of edge slots, each of the edge slots positioned between two of the tabs;
• and
• an inner mixer disposed within the mixer body, the inner mixer comprising:
• an inner mixer body positioned such that the injection axis extends into the inner mixer body, the inner mixer body configured to receive the exhaust and the treatment fluid,
• a plurality of inner apertures extending through the inner mixer body, each of the inner apertures configured to facilitate flow of the exhaust and the treatment fluid through the inner mixer body, and
• a plurality of inner blades, each of the inner blades coupled to the inner mixer body along a portion of one of the inner apertures, each of the inner blades extending radially outward from the inner mixer body.