| 摘要 |
PROBLEM TO BE SOLVED: To provide a remaining amount measuring device using a flow rate sensor which measures flow rate of liquid pooled in a tank without power supply from outside via a heavy cable or the like, and a flow rate sensor.SOLUTION: A flow rate sensor is driven by electric power generated based on rotation of a rotor that rotates corresponding to flow of liquid. Specifically, the flow rate sensor comprises: a rotor 22 in which blades 22b rotate about a main shaft 22a corresponding to the flow of liquid; a rotating magnet body 23 on a surface of which S pole and N pole are arranged in order with respect to a rotation direction, and rotates interlocking with rotation of the main shaft of the rotor; a rotation detecting section which detects rotation number of a rotating magnet body 23 relating to a flow rate of liquid, and also comprises: a coil section 26 which is provided in a vicinity of the rotating magnet body 23, and creates electric current corresponding to a size of a change of magnetic flux; and a power supply section which is charged by the electric current created in the coil section, and supplies driving current to a magnetic sensor 24, the rotation detecting section, and a rotation number output section. |
