| 摘要 |
A connection tube is provided to prevent noise generating when outer air inflows together in the air in a body by installing a muffler in inside the body. A connection tube for a vacuum cleaner having a dust sensing function comprises a suction nozzle(110) inhaling air including dust or dirt, a connection tube(120) including a dust sensor, an operating handle(130), a suction hose(140) connecting to the operating handle and a cleaner body(150), connecting to the suction hose, segmented into a dust chamber and a motor room. The dust sensor includes a light emitting area and light receiving area, and read existence and nonexistence of the dust or the dirt when the air passing through a second air suction passage.
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