| 摘要 |
PURPOSE: A recirculating type pipe and a structure of an inhaler are provided to inject air of high pressure into a groove of a circumferential surface, thereby discharging dust through the pipe to outside forcibly, effectively, and rapidly. CONSTITUTION: A structure of a recirculating type pipe comprises one or more grooves(20). The one or more grooves are vertically formed along the outer circumference of a cylindrical body(10). The cylindrical body is formed into one of a vertical shape or a screw-thread shape.
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