Device for Purifying the Exhaust Gas of an Internal Combustion Engine

摘要

This exhaust gas purification device (2, 102), comprising an upstream pipe (4), in which a first exhaust gas purification member (6) is housed, a downstream pipe (8) in which a second exhaust gas purification member (10) is housed, a mixing chamber (12) and an injection device (20) for a nitrogen oxide reducing product;;is characterized in that the mixing chamber includes a first deflector member capable of channeling the flow of exhaust gas such that it flows through the jet of nitrogen oxide reducing product substantially perpendicular to the second deflector member (36,56), the second deflector member being configured to form two swirling flows of a mixture of exhaust gas and nitrogen oxide reducing product;;and in that the device further includes an element (54, 58) for protecting the second member (10) for purifying exhaust gas.

主权项

1. A device (2, 102) for purifying exhaust gases, comprising:
an upstream pipe (4) in which is housed a first member (6) for purifying exhaust gas; a downstream pipe (8) in which is housed a second member (10) for purifying exhaust gas; a mixing chamber (12) comprising a lateral wall (36) defining an exhaust gas inlet (14) communicating with the upstream pipe (4) and an exhaust gas outlet (16) communicating with the downstream pipe (8); an injection device (20) able to inject, in the mixing chamber (12), at least one jet of a nitrogen oxide reducing product in an injection direction; characterized in that the mixing chamber (12) includes a first deflector member (54) and a second deflector member (36, 56), the first deflector member (54) being capable of channeling the flow of exhaust gas such that it flows through the jet of nitrogen oxide reducing product in a deflected direction forming, with the injection direction, an angle close to 90°, then substantially perpendicular to the second deflector member (36, 56), the second deflector member (56) being configured to form two swirling flows of a mixture of exhaust gas and nitrogen oxide reducing product on either side of the jet of nitrogen oxide reducing product; and in that the device further includes an element (54, 58) for protecting the second member (10) for purifying exhaust gas, the protection element (54, 58) extending in front of the jet of nitrogen oxide reducing product.