| 摘要 |
PURPOSE:To increase the degree of freedom in design so as to reduce weight and noise by forming each blade from a metallic blade-mounting portion and a non-metallic blade portion covering the mounting portion, and forming each end ring and the blade-mounting portion from or metal plate. CONSTITUTION:The impeller of a multiblade centrifugal blower comprises a pair of end rings 1, 2 a plurality of blades 3, and a center disk 4. In this case, each of the blades 3 is formed by a metallic blade-mounting portion 5 and a non-metallic blade portion 6 covering the blade-mounting portion 5. The end rings 1, 2 and the blade-mounting portion 5 are formed from one metal plate. The center disk 4 is secured to each of the blades 3. Therefore the degree of freedom in design is increased to set an optimum material in an optimum shape for the operating condition of the blower. Then a 25% weight reduction and a 6% noise reduction of the blower can be achieved, and the larger the aperture of the impeller, the greater the effects.
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