| 摘要 |
PROBLEM TO BE SOLVED: To provide an exhaust gas introduction device capable of introducing exhaust gas and reducer to an exhaust gas after treatment device under a homogeneous condition. SOLUTION: This device is provided with a bottomed cylinder shape inner case 3 connecting an opening edge thereof to a flow in side end part of the exhaust gas after treatment device 1, and a bottomed cylinder shape outer case 4 covering an outer side of the inner case 3. Exhaust gas introduced to a part between circumference walls 3a, 4a of the inner and the outer case 3, 4 from an exhaust gas introduction opening 4b provided on the circumference wall 4a of the outer case 4 is made flow into an inside (mixing chamber 7) of the inner case 3 via an opening 6 provided on a bottom wall 3c of the inner case 3 from a part between bottom walls 3c, 4c of both cases 3, 4. The reducer is injected from an atomizer 5 attached to the bottom wall 4c of the outer case 4 and is supplied to the mixing chamber 7 and the mist of the exhaust gas and the reducer is mixed in the mixing chamber 7 and supplied to the exhaust gas after treatment device 1. The circumference wall 3a of the inner case 3 is composed of an inclined surface 3b displacing in a center side as it approaches the bottom wall 3c side at an opposite position to an exhaust gas introduction opening 4b. Consequently, exhaust gas and the reducer can be supplied homogeneously to a catalyst of the exhaust gas after treatment device. COPYRIGHT: (C)2007,JPO&INPIT
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