| 摘要 |
PROBLEM TO BE SOLVED: To increase amount of main blast air flow with entrained air flow and transfer air to far distance when the air is fed as air flow to a space with a blower. SOLUTION: A blast guide cylinder 3 is provided before blast blades 2 of a blower 1, a clearance A for suction of entrained air is constituted between a base of the blast guide cylinder 3 and the blast blades 2, entrained air (a) is sucked from the clearance A for suction of entrained air following rotation of the blast blades 2, this entrained air (a) is associated and mixed with main blast air flow (b) sucked from the back surface of the blast blades 2 to increase blast amount. Therefore, speed of blast air flow guided and blown in the blast guide cylinder 3 is increased, damping is reduced, and air is transferred to far distance.
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