| 摘要 |
An exhaust pipe includes an outer pipe and an inner pipe firmly fitted in the outer pipe. An air intake pipe and an outlet pipe having a comparatively small diameter are positioned respectively at two opposite ends of the outer pipe and respectively communicating with the front and the rear end of the inner pipe. Besides, a great number of through holes are bored around the wall of the inner pipe. Then an intermediate pipe having numerous through holes around the wall is fitted around the inner pipe, with a plurality of gaps formed between both the pipes. The muffling cotton is filled in a space between the outer pipe and the intermediate pipe. Thus, the intermediate pipe is easy to assemble, kept secured firmly for a long time and achieving effectual muffling.
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