| 摘要 |
PROBLEM TO BE SOLVED: To provide an electric blower which enhances blast efficiency and prevents an impeller from being deformed even though the acceleration is applied from the outside. SOLUTION: In at least one of clearances A between a rear shroud 5 and a substrate 12 of an air guide 10 and between a front shroud 4 and a casing 13, the axial distance is gradually increased from the center toward the outer periphery. A size of the clearance A is made equal to the size of the inclination of the impeller 2 by external force. By so doing, the clearance A is minimized to reduce the volume of air circulating in the clearance A. The production of turbulent flow at an area irrelevant to the mainstream is prevented to enhance blast efficiency. Even though the impeller 2 is inclined due to application of external force, as a result, the impeller 2 does not come into contact with at least one of substrate 12 and casing 13 so as to be prevented from being deformed. COPYRIGHT: (C)2008,JPO&INPIT
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