| 摘要 |
PROBLEM TO BE SOLVED: To reduce pressure loss at a blow out channel while increasing a suction quantity of gas from a suction port further and increasing force pressing gas into the suction port (dynamic pressure of a fan). SOLUTION: A casing body 5 includes a revolution channel 10 making gas sucked through an suction air opening part 9 opening at a part in a rotation direction of an impeller 2 on an outer side of a front wall 8 revolve in the same direction as a rotation direction of the impeller 2 and flow toward the suction port 3, and an introduction part 11 disposed at a terminal part of the revolution channel 10 and introducing gas made to flow by the revolution channel 10 to a suction port 3. A blow out channel continues to a part between an outer circumference of the impeller 2 and a blow out channel wall and is formed between a blow out channel wall and a connection wall connected toward the blow out port from a tongue part. A channel part where the tongue part faces the blow out channel wall in the blow out channel is constructed in such a manner that the channel on a side separating from a front wall in a rotary axial direction of the impeller is wider than that on a side getting close to the front wall. COPYRIGHT: (C)2010,JPO&INPIT
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