| 摘要 |
PURPOSE: To facilitate the handling of nozzles by radially providing the device with injection ports which open from a hollow cylinder in an acute angle direction with respect to a supply direction of high-pressure water and inject the high-pressure water. CONSTITUTION: The forward injection hole 10 is closed and the backward injection port 11 are opened by a flow passage switching mechanism 12. In this state, the injection nozzle 5 is inserted into piping 16 connected to an opened vessel 15. Simultaneously the high-pressure water is supplied from a high- pressure water supply device 2 via a flexible hose 3 to the injection nozzle 5. The high-pressure water 9 is ejected out of the backward injection hole 11 and flushes away the deposited to the inside surface of the piping 16 by a high- pressure jet. The high-pressure water 9 is ejected by the uniform discharge pressure from the backward injection hole 11 radially formed and, therefore the injection nozzle 5 is held in the central part of the piping 16 at all times. As a result, the occurrence of unequal washing on the inside surface of the piping is lessened. |
