| 摘要 |
PURPOSE:To improve rotation efficiency of an impeller and increase suction air flow by providing a projection shielding an interval between a shroud and a main body on either of the outer periphery or the main body of shroud of the impeller. CONSTITUTION:A dust collecting filter 24 is disposed on the air suction side in a main body 21, and an impeller 28 rotated and driven through a motor 25 is disposed on the rear of the filter 24. The impeller 28 is formed by a plurality of blades 32 and one shroud 29, and a projection 30 sealing an interval between the shroud 29 and the main body 21 is provided on either of the outer periphery or the main body 21 of the shroud 29. As a result, the rotation efficiency of the impeller is enhanced to increase suction air flow. |
