Importance

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Abstract

A flow meter comprises a fan wheel provided in a passage of a running fluid to be rotated thereby; a composite magnetic wire formed of a core and shell and fitted to the fan wheel; a pair of mutually facing permanent magnets arranged substantially in parallel above a plane through which the composite magnetic wire is rotated, with the poles of the opposite polarities set adjacent to each other; a magnetic core wound with a coil and disposed between the paired permanent magnets, and wherein, when the composite wire faces one of the paired permanent magnets, the alignment direction of the respective magnetic domains of the core of the composite magnetic wire is changed, and when the composite wire faces the other of the paired permanent magnets, the respective magnetic domains of the core of the composite magnetic wire regains the alignment direction before said change. Therefore, when the composite magnetic wire passes below the paired permanent magnets, pulses are generated in the coil; pulses thus generated are counted by a counter; a counted number of pulses is converted into a signal denoting a detected flow of a running fluid; and the converted signal is registered and indicated on a display device.

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First Claim