| 摘要 |
An axial-flow type impedance water flow sensor comprises a water wheel (3), a cyclone (4), a metal detection needle (7) and a detection circuit. The cyclone (4) is mounted at a water inlet side (5) of a water pipe (1), a bracket (2) is mounted at a water outlet side (6) of the water pipe (1), and the water wheel (3) is movably mounted between the bracket (2) and the cyclone (4). The water wheel (3) is provided with at least two blades (3-2) that are arranged uniformly. An upper end portion and a lower end portion (3-1, 3-4) of a rotation shaft of the water wheel (3) are fixedly connected to a center of the bracket (2) and a center of the cyclone (4) respectively through a bearing. A metal detection needle (7) is mounted on a wall of the water pipe corresponding to the water wheel (3), and has one end surface located on an inner wall surface of the water pipe (1) and the other end being connected to a signal input end of the detection circuit. The axial-flow type impedance water flow sensor can accurately detect the water flow without being affected by the water quality and impurities in the water. Moreover, less wear occurs between the shaft of the water wheel and the bearing, and the water wheel has low inertia and low cost. |
