| 摘要 |
PURPOSE:To reduce the cost of the title device by making the diameter of at least one injection hole of a nozzle larger than the diameter of other injection holes to exert unbalanced thrust on the nozzle. CONSTITUTION:High-pressure cleaning water passes through an inlet hole 4 from a cleaning hose 2, flows into a nozzle bearing 3, then passes through a shaft hole 11, and is injected from the injection holes 9a-9d. At this time, the nozzle 8 is rotated by the fluid energy caused by a vane 10 along with a nozzle guide member 12. In addition, unbalanced thrust for pressing the nozzle 8 on the inner wall 1a of a pipe 1 is produced by the difference in the diameter between the injection hole 9a and the injection hole 9c. Accordingly, the force of fluid energy exerted on the vane 10 and the unbalanced thrust caused by the injection hole are concurrently exerted on the nozzle 8, and the nozzle 8 rotates, moves along the inner wall 1a, or turns. As a result, the nozzle 8 is rotated inseparably from the inner wall 1a of even a large-diameter pipe 1. The nozzle 8 is moved forward by the driving force, since the injection hole 9 is inclined toward the inner wall 1a. |
