Mixing subassembly for an exhaust gas system of an internal combustion engine

A mixing subassembly for an exhaust gas system of an internal combustion engine for mixing exhaust gas discharged by the internal combustion engine with a reactant, the mixing subassembly comprising:

• said mixing subassembly defining a mixing path having a longitudinal axis along which said mixing path extends;
• said mixing path having an upstream mixing path inflow region for receiving at least one of said exhaust gas and said reactant into said mixing path;
• a core flow channel for passing a first exhaust gas partial flow therethrough;
• a bypass flow channel for passing a second exhaust gas partial flow therethrough, said bypass flow channel including a covering flow channel annularly surrounding said core flow channel;
• said mixing path including an external mixing path housing delimiting said covering flow channel in a radially outward manner and having an inner side facing toward said covering flow channel;
• said mixing path including an internal mixing path housing delimiting said core flow channel in a radially outward manner to separate said core flow channel from said covering flow channel and having an outer side facing toward said covering flow channel;
• at least two flow blocking elements, each flow blocking element of said at least two flow blocking elements including a flow blocking ring arranged in said covering flow channel to reduce a flow cross section of said covering flow channel;
• at least one first flow blocking element of said at least two flow blocking elements being secured to said inner side of said external mixing path housing so as to form a first throughflow region between said least one first flow blocking element and said outer side of said internal mixing path housing, said first throughflow region having a flow cross section reduced with respect to a flow cross section of said covering flow channel upstream of said at least one first flow blocking element and with respect to a flow cross section of said covering flow channel downstream of said at least one first flow blocking element;
• at least one second flow blocking element of said at least two flow blocking elements being secured to said outer side of said internal mixing path housing so as to form a second throughflow region between said at least one second blocking element and said inner side of said external mixing path housing, said second throughflow region having a flow cross section reduced with respect to said flow cross section of said covering flow channel upstream of said at least one second flow blocking element and with respect to said flow cross section of said covering flow channel downstream of said at least one second flow blocking element;
• and,
• said first and second flow blocking elements being secured alternately to said external mixing path housing and said internal mixing path housing in a successive manner in the direction of said longitudinal axis of said mixing path.