| 摘要 |
PROBLEM TO BE SOLVED: To prevent attachment and accumulation of oil and dust included in the exhausted air to a sensor by not disposing a pressure detecting portion in main flow of airflow, to solve a problem of the attachment and accumulation of oil and dust included in the exhaust air when a wind speed sensor, a dynamic pressure sensor and a static pressure sensor converting air volume into a voltage signal, are disposed in the main flow of airflow generated by an air blower. SOLUTION: A pressure hole 15 is positioned on a back side of a main plate 6a at an inner side with respect to an outside diameter projection face of a centrifugal fan 6. As the pressure hole 15 for measuring an internal pressure of a fan case 3 is positioned at a back side of the main plate 6a of the centrifugal fan 6 at the inner side with respect to the outside diameter projection face of the centrifugal fan 6, the airflow is not directly applied thereto. COPYRIGHT: (C)2008,JPO&INPIT
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