| 摘要 |
PURPOSE:To contrive reduction of a dynamic balance change amount and improvement of impulse strength. CONSTITUTION:An extension end of a fan blade 11, extended along the axial direction from both side surfaces 9a, 9b of an intermediate plate board 9 and continuously integrally molded, is melded to an internal side surface 15b of right/left side plate board 15, and on the other hand, an extension end of the fan blade 11, extended along the axial direction from the right/left side plate board 15 and contiunously integrally molded, is welded to both the side surfaces 9a, 9b of the abovementioned intermediate plate board 9. |
