Mixer

An exhaust system for an internal combustion engine, comprising a mixer for mixing exhaust gas and reactant, the mixer comprising:

• a mixing chamber delimited by an upstream mixer wall, a downstream mixer wall following the upstream mixer wall in a direction of a mixer longitudinal axis (L) and arranged at an axial distance from said upstream mixer wall, and a circumferential wall extending between said upstream mixer wall and said downstream mixer wall;
• a reactant dispenser for dispensing reactant into said mixing chamber axially between said upstream mixer wall and said downstream mixer wall;
• an inlet opening arrangement in said upstream mixer wall;
• an outlet opening arrangement in said downstream mixer wall or said circumferential wall;
• a flow guide, arranged between said upstream mixer wall and said downstream mixer wall, said flow guide being configured to guide a mixture of the exhaust gas and the reactant from said inlet opening arrangement to said outlet opening arrangement, wherein said flow guide provides a first flow path leading from said inlet opening arrangement to said outlet opening arrangement and a second flow path leading from said inlet opening arrangement to said outlet opening arrangement;
• and, wherein said first flow path and said second flow path each have at least two flow channels leading from said inlet opening arrangement to said outlet opening arrangement,
• wherein said flow guide includes, in association with at least one of said first flow path and said second flow path, at least two flow guiding walls extending between said upstream mixer wall and said downstream mixer wall and connected to said upstream mixer wall and said downstream mixer wall by at least one of material joining and positive engagement;
• and, wherein at least one of:
• at least one of said at least two flow guiding walls, together with said circumferential wall, delimits a corresponding one of said at least two flow channels;
• and,
• at least one of said at least two flow guiding walls, together with a further flow guiding wall, delimits a corresponding one of said at least two flow channels.

A mixer for an exhaust system of an internal combustion engine for mixing exhaust gas and reactant, the mixer comprising:

• a mixing chamber delimited by an upstream mixer wall, a downstream mixer wall following the upstream mixer wall in a direction of a mixer longitudinal axis (L) and arranged at an axial distance from said upstream mixer wall, and a circumferential wall extending between said upstream mixer wall and said downstream mixer wall;
• a reactant dispenser for dispensing reactant into said mixing chamber axially between said upstream mixer wall and said downstream mixer wall;
• an inlet opening arrangement in said upstream mixer wall;
• an outlet opening arrangement in said downstream mixer wall or said circumferential wall;
• a flow guide, arranged between said upstream mixer wall and said downstream mixer wall, said flow guide being configured to guide at least one of the exhaust gas and the reactant from said inlet opening arrangement to said outlet opening arrangement, wherein said flow guide provides a first flow path leading from said inlet opening arrangement to said outlet opening arrangement and a second flow path leading from said inlet opening arrangement to said outlet opening arrangement;
• and, wherein said first flow path and said second flow path each have at least two flow channels leading from said inlet opening arrangement to said outlet opening arrangement, wherein said flow guide includes, in association with at least one of said first flow path and said second flow path, at least two flow guiding walls extending between said upstream mixer wall and said downstream mixer wall;
• and, wherein at least one of:
• at least one of said at least two flow guiding walls, together with said circumferential wall, delimits a corresponding one of said at least two flow channels;
• at least one of said at least two flow guiding walls, together with a further flow guiding wall, delimits a corresponding one of said at least two flow channels;
• wherein said flow guide includes at least one flow guiding element, said at least one flow guiding element providing a corresponding one of said at least two guide walls for each of said first flow path and said second flow path;
• wherein said at least two flow channels of said second flow path include a second outer flow channel and said at least at least two flow channels of said first flow path include a first outer flow channel;
• wherein said flow guide includes an outer flow guiding element delimiting said first outer flow channel and said second outer flow channel;
• said outer flow guiding element provides an outer transitional region;
• wherein at least one of:
• said outer flow guiding element, in said outer transitional region, provides one of said at least two guiding walls of said first flow path configured as an outer flow guiding wall which merges into a corresponding one of said at least two guiding walls of said second flow path configured as an outer flow guiding wall of said second flow path;
• and
• said outer flow guiding element provides an outer opening region for at least one of entry of the exhaust gas and the reactant in a region of the mixing chamber surrounded by said outer flow guiding element.

An exhaust system for an internal combustion engine, comprising a mixer for mixing exhaust gas and reactant, the mixer comprising:

• a mixing chamber delimited by an upstream mixer wall, a downstream mixer wall following the upstream mixer wall in a direction of a mixer longitudinal axis (L) and arranged at an axial distance from said upstream mixer wall, and a circumferential wall extending between said upstream mixer wall and said downstream mixer wall;
• a reactant dispenser for dispensing reactant into said mixing chamber axially between said upstream mixer wall and said downstream mixer wall;
• an inlet opening arrangement in said upstream mixer wall;
• an outlet opening arrangement in said downstream mixer wall or said circumferential wall;
• a flow guide, arranged between said upstream mixer wall and said downstream mixer wall, said flow guide being configured to guide at least one of the exhaust gas and the reactant from said inlet opening arrangement to said outlet opening arrangement, wherein said flow guide provides a first flow path leading from said inlet opening arrangement to said outlet opening arrangement and a second flow path leading from said inlet opening arrangement to said outlet opening arrangement;
• and, wherein said first flow path and said second flow path each have at least two flow channels leading from said inlet opening arrangement to said outlet opening arrangement, wherein said flow guide includes, in association with at least one of said first flow path and said second flow path, at least two flow guiding walls extending between said upstream mixer wall and said downstream mixer wall;
• and, wherein at least one of:
• at least one of said at least two flow guiding walls, together with said circumferential wall, delimits a corresponding one of said at least two flow channels;
• at least one of said at least two flow guiding walls, together with a further flow guiding wall, delimits a corresponding one of said at least two flow channels;
• wherein said flow guide includes at least one flow guiding element, said at least one flow guiding element providing a corresponding one of said at least two guide walls for each of said first flow path and said second flow path;
• wherein said at least two flow channels of said second flow path include a second outer flow channel and said at least at least two flow channels of said first flow path include a first outer flow channel;
• wherein said flow guide includes an outer flow guiding element delimiting said first outer flow channel and said second outer flow channel;
• said outer flow guiding element provides an outer transitional region;
• wherein at least one of:
• said outer flow guiding element, in said outer transitional region, provides one of said at least two guiding walls of said first flow path configured as an outer flow guiding wall which merges into a corresponding one of said at least two guiding walls of said second flow path configured as an outer flow guiding wall of said second flow path;
• and
• said outer flow guiding element provides an outer opening region for at least one of entry of the exhaust gas and the reactant in a region of the mixing chamber surrounded by said outer flow guiding element.