| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a duct cleaning device which cooling a driving shaft and a scraping blade fixed to the driving shaft, and suppresses running costs without using a large air compressor. <P>SOLUTION: A compressed air supply passage communicating an opening of the scraping blade with the air compressor is provided in an interior of the driving shaft, and compressed coolant gas is supplied to the scraping blade from the compressed air supply passage. Meanwhile, uncompressed coolant gas supplied from a blower is supplied to a body of the driving shaft. <P>COPYRIGHT: (C)2004,JPO</p> |
