Axial flow impedance type water flow sensor

Abstract

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.

Description

technical field [0001] The invention relates to the technical field of water flow sensors, in particular to an axial flow resistance water flow sensor. Background technique [0002] At present, the water flow sensors used to detect the water flow on instant gas water heaters mainly include axial flow and side flow. They both use water to drive the impeller to rotate and change the position of the magnet that moves with it. Hall The element detects the water flow according to the pulse signal generated by the change of the polarity of the magnet. [0003] The axial flow water flow sensor is equipped with a swirler composed of multiple turbine-shaped fixed blades at the water inlet. The sensor detects the water flow by sending a pulse signal according to the change of the magnetic polarity of the magnetic blade. The advantage of the water flow sensor is that the linear relationship between the water flow and the speed of the magnetic blade is good, and the speed is stable; t...

AI Technical Summary

Problems solved by technology

Its advantage is that the magnet can be isolated from the water wheel and the water channel, but the linear relationship between the water wheel speed and the water flow is not good enough, which affects its detection accuracy, and because the water wheel blades are unilaterally pushed by the water flow, the water wheel shaft and the bearing are affected by water. The influence of the radial force of the wheel is greater and it is prone to wear and tear, which shortens the working life

[0005] The water wheels of the above two water flow sensors will increase their mass due to the existence of magnets, increasing their inertia and reducing the response speed to instantaneous changes in water flow.

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