| 摘要 |
<p>This invention relates to an appliance for cleaning a polluted inner wall of ducts of a pipe system. The appliance includes a covering (1) surrounding an inner structure (10). The inner structure (10) comprises a springy shaft (2), with a first (5) and a second end part (15) mutually spaced apart a distance. Attached to the first end part (5) are a plurality of first fibers which protrude radially with respect to the shaft (2) for forming a first brush (3). Attached to the second end part are a plurality of second fibers which protrude radially with respect to the shaft (2) for forming a second brush (13). The length of the first and second fibers is such that the sum of the thickness of the covering and the diameter of the brushes (3, 13) is equal to or greater than the diameter of the duct.</p> |
