Patent ID: 8092746

Claim:
A catalytic purification device ( 10 ), comprising: a substrate ( 14 ) which is permeable to exhaust gases and has an upstream face ( 14 A) and an opposing downstream face ( 14 B); and a casing ( 12 ) which contains the permeable substrate ( 14 ) and which delimits a chamber ( 20 ) which has an inlet channel ( 32 ) and an outlet channel ( 34 ) between which the permeable substrate ( 14 ) is interposed, the upstream face ( 14 A) of the permeable substrate ( 14 ) extending in a continuation of the inlet channel ( 32 ) along an axis of the inlet channel, the axis of the inlet channel delimiting, with the upstream face ( 14 A), an angle of less than 20°, the upstream face ( 14 A) having a front side toward the inlet channel ( 32 ) and a rear side opposite the inlet channel ( 32 ), said casing ( 12 ) comprising a shell ( 22 A, 22 B) which covers the upstream face ( 14 A) of the substrate and delimits therewith a chamber in the continuation of the inlet channel ( 32 ), said casing ( 12 ) also comprising, at an outlet of the inlet channel ( 32 ), a deflector ( 70 ) formed by a deformation of the shell ( 22 A, 22 B) which delimits, towards an inner side of the chamber, a face ( 72 ) which is inclined towards the permeable substrate ( 14 ), the deflector ( 70 ) being inclined towards the upstream face ( 14 A) and sufficient to direct the exhaust gases from the inlet channel ( 32 ) towards the permeable substrate ( 14 ), the deflector ( 70 ) extending entirely above a front half of the upstream face ( 14 A) of the permeable substrate ( 14 ) arranged at a side of the inlet channel ( 32 ), and the deflector ( 70 ) extending from the inlet channel ( 32 ) between a bottom portion ( 74 ) remote from the upstream face ( 14 A) of the permeable substrate ( 14 ) and a top portion ( 76 ) close to the upstream face ( 14 A), and said casing ( 12 ) further comprising, from the top portion ( 76 ), a level ( 78 ) which extends along the upstream face ( 14 A) of the permeable substrate ( 14 ) from the top portion ( 76 ) towards the rear side of the upstream face ( 14 A), the level ( 78 ) being face-to-face with the upstream face ( 14 A), and the level having, in the direction from the deflector ( 70 ) towards the rear side of the upstream face ( 14 A), means ( 102 , 104 , 106 ; 142 , 144 , 146 , 148 ) for creating turbulences in a flow along the upstream face ( 14 A).