| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem wherein an air volume loss is generated when an inner diameter of a wind tunnel part is narrowed, a pressure loss is generated and noise is generated when an attaching part generates a vortex flow because the attaching part of a bellmouth attached on the side of an air suction port of a blower wind tunnel part is projected to an inside of the wind tunnel part. SOLUTION: The bellmouth 13 attached on a curled end edge 6a of the wind tunnel part structuring a blower so as to be engaged and disengaged is provided with a diameter reduced part with a recessed part 13a, outer edge part 13b, and an inner edge part 13c by forming the diameter reduced part in a two forked shape. The outer edge part 13a is longer than the inner edge part 13a, and an inner diameter of the inner edge part is formed to be approximately same as an inner diameter of the end edge of the wind tunnel part. A connecting part is formed in a gradual curved surface so that an air flow sucked in by the bellmouth does not form the vortex flow at the connecting part. COPYRIGHT: (C)2004,JPO
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