Exhaust gas purification device

Abstract

An exhaust gas purification device comprises a first channel member that forms an exhaust gas flow path leading to a catalyst and a second channel member that forms a reducing agent flow path guiding a reducing agent injected by an injector to the exhaust gas flow path upstream of the catalyst. The second channel member is inserted so as to penetrate a side wall of the first channel member to protrude into the exhaust gas flow path.

1 . An exhaust gas purification device comprising:
 a first channel member that forms an exhaust gas flow path leading to a catalyst; and   a second channel member that forms a reducing agent flow path guiding a reducing agent injected by an injector to the exhaust gas flow path upstream of the catalyst,   wherein the second channel member is inserted so as to penetrate a side wall of the first channel member to protrude into the exhaust gas flow path.   
     
     
         2 . The exhaust gas purification device according to  claim 1 ,
 wherein the second channel member is a tubular member,   wherein the second channel member comprises a first end that opens on an injector side and a second end that is located on an opposite side from the first end and that opens in the exhaust gas flow path, and   wherein the second channel member forms the reducing agent flow path from the first end to the second end, the reducing agent flow path being blocked from the exhaust gas flow path.   
     
     
         3 . The exhaust gas purification device according to  claim 1 ,
 wherein the exhaust gas flow path is provided, upstream of the catalyst, with a diffusion member that reduces bias of exhaust gas flowing into the catalyst, and   wherein the second channel member forms the reducing agent flow path guiding the reducing agent to the exhaust gas flow path upstream of the diffusion member.   
     
     
         4 . The exhaust gas purification device according to  claim 1 ,
 wherein part of the second channel member inserted in the exhaust gas flow path has a function of guiding exhaust gas that has hit an outer surface of the second channel member to flow around along the outer surface.   
     
     
         5 . The exhaust gas purification device according to  claim 1 ,
 wherein part of the exhaust gas flow path in which the second channel member is inserted is extended so as to be enlarged in a third direction orthogonal both to a first direction that is a direction of flow of exhaust gas hitting the outer surface of the second channel member and to a second direction that is an axial direction of the second channel member.   
     
     
         6 . The exhaust gas purification device according to  claim 5 ,
 wherein a cross-sectional shape of the first channel member and a cross-sectional shape of the second channel member are dissimilar to each other, and   wherein the cross-sectional shape of the first channel member is wider in the third direction than the cross-sectional shape of the second channel member.   
     
     
         7 . The exhaust gas purification device according to  claim 1 ,
 wherein a leading end of the second channel member is located in a central part of the exhaust gas flow path.