| 摘要 |
PURPOSE:To reduce the generation of noise and improve efficiency, to facilitate variation of the shape of a vane and the length of a fan, to improve reliability, and to reduce a cost. CONSTITUTION:A plurality of blades 24 are annularly arranged on one surface of a disc-shaped or an annular partition plate 25 and integrally erected in an inclined state at a given angle. A piece of multiblade impeller 26 is thus integrally molded. Plural pieces of the multiblade impellers 26 are axially stacked, in order, and fixed. An end plate 22 is secured to the tips on one side of the vanes 24 of each of the multiblade impellers at the two ends of the laminate and meanwhile, a boss part 27 to intercouple rotary shafts is formed at the other partition plate 25. |
