FLOW RATE DETECTOR FOR WATER PURIFIER

摘要

PROBLEM TO BE SOLVED: To provide a flow rate detector for a water purifier capable of reducing a difference between individual bodies in detection sensitivity and detecting a flow rate accurately and manufacturable at low cost with high reliability. SOLUTION: An impeller 42 rotating in the fixed direction around a central axis of a water conducting tube 39 by a water stream is provided in the water conducting tube 39 for measuring a flow rate, and a magnet 42a is arranged at its tip in the radial direction to rotate a magnetic field having a magnetic flux 50 protruding through radially in the radial direction. A coil 43 is arranged in a scope where the rotation magnetic field passes to lead an induced current like pulsation generated in the coil 43 by the magnetic flux 50 into a signal processing part 100 for binarization processing. A digital signal corresponding to passing of the magnetic flux 50 is formed and is counted and integrated to detect a flow rate. COPYRIGHT: (C)2003,JPO