| 摘要 |
<p>A device for injecting a high pressure water stream of uniform pressure to clean the surface of the wall of a tunnel, which supplies high pressure water via a high pressure water guide pipe (4), injects the water from a nozzle (1) having an elliptical hole (2), supplies compressed air via a guide pipe (5), discharges the air through a passage (7 min ) between the first pipe (8) of hollow rectangular section and the second pipe (9) of hollow rectangular section disposed therein, simultaneously discharges the air via the passage (6 min ) of the second pipe (9), and joins part of the air stream of the passage (7 min ) through an air passage hole (9 min ) to the air stream of the passage (6 min ). Thus, the injected water stream is discharged as a laminated fluid surrounded by a plurality of air stream layers to obtain a water pressure pattern of uniform pressure on the surface to be cleaned, thereby efficiently cleaning the wall. This device can be utilized for a painting, a removing solvent, etc.</p> |
