| 摘要 |
<p>In a cleaning nozzle, a trumpet-shaped portion made up of multiple inclined portions (3,4) or a curved portion is formed upstream of a minimum diameter portion (2) of an ejection nozzle portion (45) of a converging-diverging shape, and a gas ejection port (5) is opened to an intermediate part of the trumpet-shaped portion. Inside the gas ejection port (5) is formed a cleaning liquid ejection port (13). A gas is ejected at a higher speed than that of a cleaning liquid from the cleaning liquid ejection port to transform the cleaning liquid into droplets, which are further accelerated by a tapered portion (26) formed downstream of the minimum diameter portion (2) before being ejected. A small amount of liquid may be supplied to a pressurized gas passage between a powder injection portion and the cleaning nozzle to prevent a possible clogging of passage due to powder. <IMAGE></p> |
