| 摘要 |
PROBLEM TO BE SOLVED: To provide a fan tunnel of a blower reducing propagation sound of space resonance sound without deteriorating draft characteristics as a method for suppressing noise in a noise transmission route. SOLUTION: In the fan tunnel of a blower so constituted that a plurality of blades rotate in the fan tunnel, inlet air is sucked from the inlet of the fan tunnel, and the air is guided by the guide tube of the fan tunnel and discharged from an outlet, when a ratio of a inner circumference average radius (r) and a deformation amount A from the inner circumference average radius (r) is in a range of 0.10≤A/r≤0.7 and mechanical anglesθis set, a shape of the inlet of the fan tunnel is formed in a roughly sinusoidal wave shape D and order (n) of the roughly sinusoidal wave shape is set. Since intensity and phase of sound disperse finely by making part of sound impinge on the sinusoidal wave shape of the inlet of the fan tunnel, overall radiated sound can be reduced extremely effectively. COPYRIGHT: (C)2005,JPO&NCIPI
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