| 摘要 |
Emission control apparatus for use with an internal combustion engine having a housing (1) with an inlet (9) connected to the exhaust of the engine and an outlet (11) connected to a discharge pipe. Mounted in the housing (1) at spaced locations are a first catalytic cell (20) and a second catalytic cell (30) through which the engine exhaust gases pass for conversion to less noxious compounds. Surrounding each catalytic cell (20, 30) is an annular wall (23, 33), which devide the housing (1) into three chambers: an inlet chamber (40), an intermediate chamber (50) and an outlet chamber (60). The gases entering the inlet chamber (40) by a silencer diffuser tube (45) are passing through first catalytic cell (20) into the intermediate chamber (50). Some of the gases return from the intermediate chamber (50) through ports (24) and silencing tubes (41) into the inlet chamber (40) for recirculation through the first catalytic cell (20). All of the gases pass from the intermediate chamber (50) through the second catalytic cell (30) into the outlet chamber (60). |
