EXHAUST PURIFICATION DEVICE

摘要

PROBLEM TO BE SOLVED: To provide an exhaust purification device capable of increasing a quantity of a reducing agent fed to an exhaust passage.SOLUTION: An exhaust purification device 1 comprises a feeder 10, a catalyst and atmospheric pressure reduction means 30. The feeder 10 feeds a reducing agent to an exhaust passage 3 through a feeding port 13 exposed to the exhaust passage 3. The catalyst is installed in the exhaust passage 3 at a downstream side of the feeder 10 and purifies exhaust using the reducing agent. The atmospheric pressure reduction means 30 can make atmospheric pressure near the feeding port 13 lower than the atmospheric pressure inside a feeder body 11 by changing a flow rate of the exhaust flowing in the exhaust passage 3. Thus, the reducing agent is sucked out of the feeder body 11 into the exhaust passage 3 through the feeding port 13.SELECTED DRAWING: Figure 2