Fluid sensor and method for detecting flow state of fluid by using same

Abstract

The invention discloses a fluid sensor, which comprise a shell, an overflow valve, a magnet, a limit bolt, a return spring and a Hall sensor, wherein a runner is arranged inside the shell and comprises a first cavity and a second cavity with a larger cross section which are communicated with each other, and the overflow valve comprises an overflow valve core, an overflow valve seat and an overflow spring; the overflow valve core is contacted with the overflow valve seat, and the overflow spring is fixedly arranged between the overflow valve core and the overflow valve seat; the cross section of a part of the overflow valve core is larger than that of the first cavity and smaller than that of the second cavity, and the part clings to the first cavity; the other part of the overflow valve core penetrates through the overflow valve seat and protrudes out of the magnet, and is closer to the limit bolt than the magnet, and the magnet is fixed in the second cavity in a sliding way and clings to the overflow valve; the limit bolt is arranged at one end of the shell with a fluid outlet, and the return spring is fixedly arranged between the magnet and the limit bolt; and the Hall sensor is arranged in a groove in the side surface of the shell. The fluid sensor can be suitable for any fluid including a liquid with slow rate and high viscosity, and can adapt to the frequent flow and static switching, and signals can be output reliably.

Description

technical field [0001] The invention relates to a fluid sensor for detecting the flow state of fluid. Background technique [0002] The fluid sensor requires the output of the flow state or static state of the fluid in the form of an electrical signal, so that the signal can be detected by the instrument and displayed by the instrument, so as to achieve the purpose of automatic detection or automatic alarm in case of failure. [0003] In the field of fluid detection, there is currently a lack of sensors with a simple structure that can effectively detect the flow state of the fluid. [0004] Traditional flowmeters are used to measure the flow of fluids. Although they can be used to detect the flow state of fluids, they have obvious defects. First, since rotating parts such as impellers are usually used as detection devices, the measurement reliability of fluids with slow flow and high viscosity (such as grease in lubrication systems) will be greatly reduced; Thirdly, high ...

AI Technical Summary

Problems solved by technology

For example, there is a passive reset structure (overflow by gap or overflow by small hole), which cannot reliably detect fluids with slow flow velocity and high viscosity, resulting in unreliable detection results and other problems.

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