| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a device and a method for cleaning a drain pipe that neither damages a drain pipe with hyperbaric pressure washing water jetted from nozzle holes nor damages the drain pipe with nozzle elements. <P>SOLUTION: The nozzle elements where a plurality of the nozzle holes are each perforated are disposed so as to allow three nozzle holes or more to be disposed on the same concentric circles above a horizontal line running through central points of the nozzle elements and be positioned at line symmetry positions relative to a vertical line running through the central points of the nozzle elements and allow the nozzle holes to be disposed at symmetric positions relative to the horizontal line below the horizontal line running through the central points of the nozzle elements, the diameters of nozzle holes other than the nozzle holes positioned that are the next to an internal vertical line of the nozzle hole disposed below the horizontal line or those of nozzle holes positioned that are the next to the vertical line are made smaller than those of the other nozzle holes, and each nozzle hole is formed to be conical such that the diameter is gradually enlarged outwardly, when viewed from a rear face as a whole. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
