| 摘要 |
PROBLEM TO BE SOLVED: To provide a blasting device having auxiliary introduction openings capable of suitably sucking the outside air according to the velocity and the direction of the airflow flowing in conduits. SOLUTION: This blasting device 1 comprises suction means 6, 20 for sucking air by rotating multi-blade fans 9, 25 and fan cases 11, 27 which contain the multi-blade fans 9, 25 and in which the conduits 12, 28 guiding the air sucked by the rotation of the multi-blade fans 9, 25 are formed by an annular inner wall surrounding the multi-blade fans 9, 25. The auxiliary introduction openings 13, 30 for introducing the air on the outside of the fan cases 11, 27 are formed in the annular inner wall on the side surface side facing the side of the multi-blade fans 9, 25 at positions facing outlets 11c, 27c for conduits for discharging the air sucked into the fan cases 11, 27. COPYRIGHT: (C)2008,JPO&INPIT
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