JPS557926A - Electric power blower - Google Patents

Abstract

PURPOSE: To reduce the noise while the blasting efficiency is kept at a high level, by means of thickening the volute tonge top end part of a blasting guide, and of setting up an inclination at end part thereof adequately.

CONSTITUTION: When an impeller 4 is rotated by means of driving a motor 2, the gas stream inflowed from an entrance 7a of a cover 7 of the impeller is entered in an entrance 5 of the impeller 4, and is discharged from an exit 6 by means of being moved to the centrifugal direction by the rotation of the impeller 4, and is converted from a kinetic pressure to a static pressure by means of entering in a volute chamber, and of being expanded slowly, and thereafter the stream cools the motor 2 by means of entering in a connecting hole 10, a discharge air path 12, and an absorbing air hole 2a of the motor, and thereafter is discharged from a discharge air port 2b. In such an electric power blower, the blower is so constituted that the starting end of the next volute chamber may be positioned at the middle from the starting end of the volute chamber to the final end, and end line of the starting end of the volute chamber may be inclined against the outer end line of the blade of the impeller 4.

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