High-sensitivity flow detector for liquid or gas

Abstract

The invention provides a high-sensitivity flow detector for liquid or gas. The high-sensitivity flow detector comprises a pipe body, a transverse plate, a stroke rod, a detection box, a positioning device and a friction power generation high-sensitivity impact detection sensor, wherein plugs are arranged on the opposite end faces of the pipe body respectively, a pore plate is arranged between thetwo plugs, a plurality of first nozzles are formed in the pore plate, and the nozzles are communicated with a gas / liquid pipe; the transverse plate is transversely arranged above the outer wall of thegas / liquid pipe; one end of the stroke rod is hinged to the transverse plate, and the other end is fixedly provided with a static contact and a positioning spring; the middle section of the travel rod is hinged with a pin shaft; and under the action of an external impact force, an impacted layer of the friction power generation high-sensitivity impact detection sensor deforms to drive the whole friction power generation assembly to deform, and an elastic layer undergoes damping vibration, so that the corresponding surfaces of a first friction layer and a second friction layer make contact with each other and are separated to generate power charges. Based on a friction power generation principle, the high-sensitivity flow detector is simple in structure, has the advantage of self-powered characteristic, can detect tiny impact force signals, and improves the flow detection sensitivity.

Description

technical field [0001] The invention relates to the technical field of electronically controlled flow detection, in particular to a high-sensitivity flow detector for liquid or gas. Background technique [0002] At present, the most commonly used nozzle forms of nozzle flowmeters are standard nozzles, long-neck nozzles, Venturi nozzles, etc. These throttling forms generally have the following disadvantages: the repeatability and accuracy of measurement are at the general level of flowmeters, due to many factors The influence is intricate, and the accuracy is difficult to improve; the site installation conditions are relatively high, and a long straight pipe section is required, which is generally difficult to meet, and the pressure loss is relatively large. Therefore, it is necessary to improve the measurement method of the pipeline. At the same time, most of the current flow detection uses magnetic induction flow detection. Magnetic induction detection is relatively expens...

AI Technical Summary

Problems solved by technology

[0002] At present, the most commonly used nozzle forms of nozzle flowmeters are standard nozzles, long-neck nozzles, Venturi nozzles, etc. These throttling forms generally have the following disadvantages: the repeatability and accuracy of measurement are at the general level of flowmeters, due to many factors The influence is intricate, and the accuracy is difficult to improve; the site installation conditions are relatively high, and a long straight pipe section is required, which is generally difficult to meet, and the pressure loss is relatively large

At the same time, most of the current flow detection uses magnetic induction flow detection. Magnetic induction detection is relatively expensive and complicated to install, and is not suitable for routine detection of limited flow. The generated external impact force is converted into a charge or a voltage output signal according to a certain rule. The triboelectric generation occurs between two materials with different properties, and the surfaces of the materials rub against each other to generate charge transfer, thereby generating a potential difference on the two surfaces. The potential difference is related to the contact area and contact frequency of the two surfaces. Therefore, the relevant impact force can be detected through the instantaneous current signal generated during the triboelectric power generation process, so as to detect the flow rate with high sensitivity

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