Exhaust gas purification device

摘要

An exhaust gas purification device including: a tube-shaped casing; a pipe that is disposed at the downstream side of the casing, is inserted into the casing so as to extend in a direction substantially perpendicular to the axial direction of the casing, and is provided with a through-hole communicating with the casing; a guide member that guides the exhaust gas inside the casing to the through-hole; and an injection device that injects a reduction agent from an upstream end of the pipe into the pipe. Then, the guide member includes a turning guide member that guides the exhaust gas to the through-hole from the tangential direction of the pipe so as to generate a swirl flow inside the pipe and a protecting guide member that covers the upstream side of an injection area of the reduction agent in the axial direction of the casing.

主权项

1. An exhaust gas purification device that purifies an exhaust gas flowing through an exhaust passage of an engine, the exhaust gas purification device comprising:
a tube-shaped casing including an upstream side and a downstream side with reference to an axial direction of the casing; a pipe disposed at the downstream side of the casing, inserted into the casing so as to extend in a direction substantially perpendicular to the axial direction of the casing, and is provided with a through-hole communicating with the casing; a guide member for guiding the exhaust gas inside the casing to the through-hole; and an injection device for injecting into the pipe a reduction agent from an upstream end of the pipe, wherein the guide member includes turning guide members guiding the exhaust gas to the through-hole from a tangential direction of the pipe so as to generate a swirl flow inside the pipe and a protecting guide member covering an upstream side of an injection area of the reduction agent in the axial direction of the casing, wherein the protecting guide member extends in an axial direction of the pipe and includes a convex exterior surface substantially facing the upstream side of the casing and a concave interior surface substantially facing the downstream side of the casing, and wherein the turning guide members each include a concave surface substantially facing the upstream side of the casing.