Patent ID: 8756921

Claim:
A diffusion apparatus configured to provide liquid communication between an injection port for injecting a reductant solution and an exhaust pipe connected to an engine that produces an exhaust flow, the diffusion apparatus comprising: (a) a diffusion chamber configured to pass the reductant solution from the injection port to the exhaust pipe, the diffusion chamber having an inlet and an outlet, wherein the inlet is an opening configured to be in fluid communication with the injection port, and wherein the outlet is an opening configured to be in fluid communication with an interior of the exhaust pipe; (b) a conduit configured to direct a portion of the exhaust flow from the exhaust pipe to the inlet of the diffusion chamber, the conduit comprising a conduit chamber partially surrounding the diffusion chamber; and (c) a baffle structure defining a baffle chamber intermediate the inlet of the diffusion chamber and the conduit, the baffle chamber receiving the portion of the exhaust flow from the conduit and discharging the portion of the exhaust flow to the diffusion chamber, the baffle structure comprising at least one aperture, the aperture being configured so that the exhaust flow moves from the conduit chamber to the baffle chamber through the at least one aperture.