| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To solve the problem of increasing cost when a structure becomes complicated due to requiring a separate part of a raw material of a large loss factor such as a rubber ring for restraining resonance of an impeller to excitation from an electric motor, and the problem of generating noise when a resonance phenomenon is excited when vibration from the electric motor is transmitted to the impeller when the vibration insulting effect is reduced since rubber is deteriorated by long-term use, in a conventional multiblade blower. <P>SOLUTION: A frequency of a natural vibration mode of being twisted in an opposite phase in the circumferential direction to a main plate 8, is dispersed by making a distance between the main plate 8 and an outer peripheral ring 10 nonuniform in the rotational direction, and the generation of noise can be prevented by restraining excitation of the resonance phenomenon with excitation force of the electric motor 7. <P>COPYRIGHT: (C)2012,JPO&INPIT</p> |
