| 摘要 |
PROBLEM TO BE SOLVED: To reduce noise from operation of a dust collector itself and an exhaust by evacuating the cases of the motor and fan of the dust collector and additionally installing a silencing case outside the motor case. SOLUTION: The motor case is obtained by arranging a cylindrical outer case material 7 integrated with a bottom face and an inner case material 8, in the same shape as and slightly smaller than the outer case, with a gap in-between, supporting sealing materials 4 and 5 by sandwiching them on the face 2 mated with the fan case and on the rim of exhaust ports 3, hermetically bonding the sealing materials, and evacuating the interior of the assembly.
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