| 摘要 |
<p>PURPOSE:To allow a heating means to ignite fine particles arrested more favorably, and to prevent an exhaust flow from blowing off a flame of fine particles during burning, by providing a flow channel switching valve and an electric heater at an upstream end face of a filter member. CONSTITUTION:A flow channel switching valve 8 is held in position in such a manner that a bypass flow channel 4b may be completely closed so as to let a total quantity of exhaust to flow after arrested into a channel 4b at which a filter member 5 is provided. After flowing into the filter member 5, the exhaust is arrested its fine particles therein and flows out wherefrom. When the fine particles are arrested to a preset level, the channel 4b is opened by pivoting the switching valve 8, whereas a channel 4a is significantly closed. While channels are arranged in such a status, a heater 6 is energized for igniting fine particles arrested at a portion around an end face of filter member 5. Fine particles arrested at a back stream side of the filter member 5 are gradually burnt for refreshing the filter member 5.</p> |
