| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce noise generated from a rotor assembly in operation. <P>SOLUTION: The rotor assembly 2 comprises a shaft 6, a bearing assembly 7, an impeller 8 and a shroud 9. The impeller 8 and the bearing assembly 7 are attached to the shaft 6, and the shroud 9 is attached to the bearing assembly 7 so as to surround the impeller 8. When the shroud 9 is attached to the bearing assembly 7, the impeller 8 freely rotates with respect to the shroud 9, and a gap between the impeller 8 and the shroud 9 is maintained irrespective of the vibration of the rotor assembly 2. As a result, the noise is not largely generated from the rotor assembly 2 in the operation. <P>COPYRIGHT: (C)2013,JPO&INPIT |
