| 摘要 |
PURPOSE:To improve blast efficiency by forming a straightening vane part in nearly parallel form onto a blast guide in an electricaly driven blower and allowing the inner edge side of a guide vane part to communicate to an exhaust flow passage and allowing the air stream supplied from a volute chamber to join and to be introduced into the exhaust flow passage. CONSTITUTION:A blast guide 7 is equipped with a guide vane part 12 in paprallel to the side wall 11 of a fan casing 6 and equipped with an exhaust flow passage 13 consisting of a straightening vane part 14 on the other surface side, and the inner edge side of the guide vane part 12 communicates to the exhaust flow passage 13 through an opened port part 15 on the outer periphery part of the blast guide 7. The air stream straightened in a volute chamber 16 is divided and advanced into an annular spiral chamber 19 and a downwardly inclined guide vane chamber 12, and a portion joins in the volute chamber in the next stage and the rest joins in the volute chamber in the former stage, and the stream is intorduced into the exhaust flow passage. Therefore, the conversion efficiency for changing the dynamic pressure of the air stream into static pressure is increased, and the blast efficiency can be improved.
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