Patent ID: 9062589
Filing Date: 2015-06-23
Classification: B01F,F01N,Y02T

Abstract:
1. A reductant aqueous solution mixing device interposed between a filter device that captures particulate matter in an exhaust gas and a selective catalytic reduction device disposed downstream of the filter device, the reductant aqueous solution mixing device adding a reductant aqueous solution in the exhaust gas, the reductant aqueous solution mixing device comprising: an elbow pipe attached to an outlet pipe of the filter device, the elbow pipe changing a flow direction of the exhaust gas flowing from the filter device; a straight pipe connected to a downstream side of the elbow pipe, the straight pipe extending in a direction intersecting an axial line of the outlet pipe of the filter device; an injector attached to the elbow pipe, the injector injecting the reductant aqueous solution into an inside of the elbow pipe toward the straight pipe; and a mixing pipe disposed in the elbow pipe to serve as a cover for the reductant aqueous solution injected from the injector, the mixing pipe being provided with a plurality of openings on a circumferential wall thereof, wherein when the circumferential wall of the mixing pipe is circumferentially quadrisected to define four areas, the plurality of openings are provided only at two of the four areas that are not adjacent to each other, and wherein a cutout is provided to a portion of the mixing pipe fixed with the elbow pipe at a position adapted to allow the exhaust gas flowing through the inlet of the elbow pipe to flow toward an injection nozzle of the injector.