Flow sensing and energy collecting device and method based on vortex street effect

Abstract

The invention discloses a vortex street effect-based flow sensing and energy collecting device and method, and the method comprises the steps that: a solid friction medium periodically contacts and is separated from a first electrode layer and a second electrode layer at the two sides of a substrate in sequence under the action of a vortex street effect when a fluid to be measured flows through a generating body, under the coupling effect of the triboelectrification effect and electrostatic induction, a friction electric signal equal to the vortex street frequency is generated between the first electrode layer and the second electrode layer, and the flow of the fluid to be measured can be obtained by measuring the frequency of the electric signal. The flow sensing and energy collecting device based on the vortex street effect and the method thereof solve the problem that a traditional vortex street flowmeter is prone to being interfered by environmental mechanical vibration, and have the advantages of being low in cost, not prone to being affected by the environment, free of external power source for energy supply and the like. The device and the method have important application prospects in the fields of thermal engineering, energy transportation, environment monitoring, medical detection and the like.

Description

technical field [0001] The invention belongs to the field of fluid flow detection, and in particular relates to a flow sensing and energy collection device and method based on vortex street effect. Background technique [0002] As one of the three major detection parameters in the field of industrial automation, flow rate plays a vital role in industrial production design and equipment operation and maintenance. Accurate, on-line, self-powered sensing of fluid flow at low cost can help ensure the safe operation of equipment , improve the economic efficiency of the enterprise. With the rapid development of electronic information technology, flow sensors have gradually developed from traditional orifice flowmeters and positive displacement flowmeters to ultrasonic flowmeters and vibration flowmeters. The acoustic wave emission device of the ultrasonic flowmeter needs an external power supply for normal use, and cannot realize the independent energy supply of the flow sensor; ...

AI Technical Summary

Problems solved by technology

Vortex flowmeters often use piezoelectric conversion devices to sense vortex signals, but it is inevitable to encounter various mechanical vibration interference in industrial sites, so it generally has problems such as low signal-to-noise ratio and narrow measurement range.

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