| 摘要 |
PROBLEM TO BE SOLVED: To control air volume with good accuracy without lowering various performances or increasing consumed power. SOLUTION: In the inlet side of a blower 12, a columnar member 24 perpendicular to the flowing direction of air is provided with a pressure detecting part 23 having a first pressure detecting hole 25 and a communication passage 26 communicating with the first pressure detecting hole 25. A second pressure detecting hole 27 is provided in the upstream side of the first pressure detecting hole 25. Air volume is controlled based on the difference between pressure detected from the second pressure detecting hole 27 and pressure detected through the communication passage 26 from the first pressure detecting hole 25. |
