A self-excited pipeline fluid piezoelectric energy harvester

Abstract

The invention relates to a self-excited pipeline fluid piezoelectric energy harvester, and belongs to the field of piezoelectric power generation. An inner wall of a pipeline is provided with a spoiler and a shell through spoke plates; end covers with bosses are arranged at two ends of a cylinder wall of the shell; a connection block is arranged at one end of a pin shaft and the other end extends outside from the shell through the left end cover and is provided with an exciter; a pin shaft is sleeved with a balance spring and a limiting spring; the balance spring abuts on the exciter and the left end cover; the limiting spring abuts on the left end cover and the connection block; a circuit board is arranged on the connection block; each piezoelectric vibrator is formed by splicing a metal substrate and piezoelectric plates; two ends and the middle part of the substrate are fixed on the left boss and the right boss and the connection block respectively; each straight piezoelectric vibrator becomes a bent structure after being assembled; and the piezoelectric crystal plates endure pressure stress. The self-excited pipeline fluid piezoelectric energy harvester has the features and advantages that the straight piezoelectric vibrators are arranged into the bent structure and form the self-excited stretching vibration energy harvester, so that the structure and the technology are simple and the cost is low; the piezoelectric crystal plates only endure the pressure stress with a controllable range and the reliability is high; and the generating capacity is easily improved by increasing the number and the lengths of the piezoelectric vibrators.

Description

technical field [0001] The invention belongs to the field of piezoelectric power generation, and in particular relates to a self-excited pipeline fluid piezoelectric energy harvester, which is used in an oil and gas pipeline monitoring system. Background technique [0002] Oil and gas pipelines are the lifeblood of national energy and economic construction. Oil and gas pipeline leakage incidents caused by natural corrosion, natural force majeure, especially man-made theft, etc. occur from time to time, not only causing huge economic losses, but also causing serious pollution to the surrounding natural environment. In the past, regular manual inspections were often used to maintain oil and gas pipelines. However, due to the long laying distance and often in inaccessible or inconvenient places, regular inspections are difficult to find leaks and repair them in time. Therefore, various methods have been proposed. Type of pipeline leak detection or anti-theft system. Although ...

AI Technical Summary

Problems solved by technology

However, most of the existing piezoelectric power generation devices for oil and gas pipelines drive the piezoelectric vibrator to generate electricity through the rotation of the fluid turbine. The structure is complex and bulky, and it is not suitable for pipelines with relatively small diameters. Under alternating tension-compression stress, the piezoelectric wafer is easily broken and has low reliability when the tension stress is too large

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