Mixer assembly for mixing an additive with an exhaust gas flow

Abstract

A mixer arrangement for mixing an additive with an exhaust-gas flow, having an exhaust-gas line, an exhaust gas flowing through the exhaust-gas line in a main flow direction, and having at least one exhaust-gas purification element which is arranged in the exhaust-gas line and which has a casing and, arranged within the casing, a flow-over surface for the exhaust gas. Here, the casing of the at least one exhaust-gas purification element has a guide structure.

What is claimed is: 
     
         1 . A mixer arrangement for mixing an additive with an exhaust-gas flow, comprising:
 an exhaust-gas line;   at least one exhaust-gas purification element which is arranged in the exhaust-gas line;   a casing;   a flow-over surface for the exhaust gas, the flow-over surface arranged within the casing;   a guide structure connected to the casing of the at least one exhaust-gas purification element;   wherein an exhaust gas flows through the exhaust-gas line in a main flow direction.   
     
     
         2 . The mixer arrangement of  claim 1 , the guide structure further comprising multiple guide elements. 
     
     
         3 . The mixer apparatus of  claim 2 , wherein the multiple guide elements are at least partially bent radially inward. 
     
     
         4 . The mixer apparatus of  claim 2 , further comprising an unwound casing, wherein the multiple guide elements are, in the unwound casing, arranged at an angle with respect to the axial extent of the casing. 
     
     
         5 . The mixer apparatus of  claim 2 , wherein each of the multiple guide elements further comprising the same shape. 
     
     
         6 . The mixer apparatus of  claim 2 , wherein the multiple guide elements are of asymmetrical design. 
     
     
         7 . The mixer apparatus of  claim 2 , wherein two adjacent multiple guide elements have different areas. 
     
     
         8 . The mixer apparatus of  claim 2 , the multiple guide elements further comprising substructures. 
     
     
         9 . The mixer apparatus of  claim 8 , the substructures in the guide elements further comprising embossments. 
     
     
         10 . The mixer apparatus of  claim 8 , the substructures in the guide elements further comprising perforations. 
     
     
         11 . The mixer apparatus of  claim 8 , the substructures further comprising incisions in the end regions of the respective guide element. 
     
     
         12 . The mixer apparatus of  claim 11 , wherein, in the case of the incisions in the end regions, the individual regions may be additionally bent. 
     
     
         13 . The mixer arrangement of  claim 1 , wherein the guide structure is formed in one piece with the casing. 
     
     
         14 . The mixer arrangement of  claim 1 , wherein the guide structure is connected to the casing. 
     
     
         15 . The mixer arrangement of  claim 1 , wherein the guide structure is connected to the casing using inductive welding. 
     
     
         16 . The mixer apparatus of  claim 1 , wherein the guide structure is arranged on the downstream-facing side of the casing of the exhaust-gas purification element. 
     
     
         17 . The mixer apparatus of  claim 1 , wherein the guide structure is arranged on the upstream-facing side of the casing of the exhaust-gas purification element. 
     
     
         18 . The mixer apparatus of  claim 1 , the at least one exhaust-gas purification element further comprising multiple exhaust-gas purification elements, wherein the multiple exhaust-gas purification elements are arranged in the exhaust-gas line. 
     
     
         19 . The mixer apparatus of  claim 18 , wherein the guide structure is arranged on at least one of the multiple exhaust-gas purification elements which is positioned upstream of another of the multiple exhaust-gas purification elements as viewed in the flow direction. 
     
     
         20 . The mixer arrangement of  claim 1 , the honeycomb body further comprising a hollow cylinder with a radially internally situated cylindrical recess.