| 摘要 |
PURPOSE:To reduce the noise of an air blower, by opposing the plural pairs of lugs and rear guiders respectively for each series of an impeller so as to minimize a decreased wind speed range, and scattering the timing of the occurrences of vane pitch sounds on each series. CONSTITUTION:In two series of an impeller, respective lugs 2a, 2b of a stabilizer 2 and respective rear guiders 3a, 3b opposite thereto, further respective lugs 2c, 2d and respective rear guiders 3c, 3d opposite thereto are disposed. Thus, as the two pairs of lugs 2a, 2b, 2c, 2d and rear guiders 3a, 3b, 3c, 3d are oppositely disposed for each series of a vane 1, a decreased wind speed range is minimized and the timing of the occurrences of vane pitch sounds are scattered so as to reduce the noise of an air blower. As the result, air blower efficiency which was previously restrained by the noise can be notably improved.
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