| 摘要 |
PURPOSE:To hinder infection of microorganism beforehand, by injecting a waterproof and thermofusible filler into an air discharge nozzles and solidifying same, so as to close the air discharge nozzles. CONSTITUTION:A sealing plug 18 is fitted into an air supply passage 17, while an injection plug 19 being fitted into one of air discharge nozzles 15, and a waterproof and thermofusible filler 20 such as wax is injected from the injection plug 19 under its fused condition and is solidified, so as to close the air discharge nozzles 15. When an air discharge device is started to operate, first the sealing plug 18 is removed and then air is supplied to the air supply passage 17, while simultaneously a propeller wing 11 is heated by a heating means, thereby fusing and flowing out the thermofusible filler 20 filled in an air discharge passage 16 and the air discharge nozzle 15. |
