| 摘要 |
PURPOSE:To enhance accuracy in making a shroud and reduce leakage of air by providing a means to fit a shroud of an impeller in a suction bell-mouth of a blower with a minute gap between the periphery of the shroud on the suction side and the internal edge of the bell mouth, i.e. by giving the shroud a curled configuration. CONSTITUTION:A shroud 6 is curled in a semicircular arc at the end face on suction side as shown in the attached illustration. Curling in such a way will increase the strength and the accuracy in making, so that gap between the shroud 6 and bell mouth 2 can be made small. As indicated by the arrow 8, most of the air is blown out from an outlet, but part of the air flows toward the curled part of the shroud 6 and, there, part further thereof is returned into the casing owing to the curl of the shroud 6 as indicated by the arrow 8', so that the amount of air leakage to the suction side is lessened and the performance of the blower is enhanced.
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