| 摘要 |
PROBLEM TO BE SOLVED: To improve flow rate sensing precision of a flow rate sensor 1 by reducing a rotation load of a vane wheel 30, the flow rate sensor 1 having a casing 20 in which a fluid path 200 is provided to penetrate it, the vane wheel 30 supported freely rotatably in the peripheral direction in the fluid path 200, and a rotation detecting means S for detecting the rotational frequency of the vane wheel 30. SOLUTION: A first magnet 34 is provided at the rotation center part of the vane wheel 30, a second magnet 24 is provided from the down stream side of the fluid path 200 while facing to the first magnet 34, and the mutual facing surfaces of the first magnet 34 and the second magnet 24 are set to have same polarity, respectively. COPYRIGHT: (C)2009,JPO&INPIT
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