A liquid coupling excitation energy harvester for power supply of wind turbine blade monitoring system

Abstract

The invention relates to a liquid-coupling excitation energy harvester for power supply for a wind generator blade monitoring system and belongs to the field of piezoelectric power generation. Two ends of the walls of an inner barrel and an outer barrel form a working chamber through arranged left wall plate and right wall plate and the working chamber is filled with a liquid; diverters are arranged at the inner side of the wall of the outer barrel; the left wall plate and the right wall plate are provided with left plug flow plates and right plug flow plates respectively; power generation units are arranged at two ends of a plummer block on the outer edge of the inner barrel; each power generation unit comprises a piezoelectric vibrator and a limiting frame; each piezoelectric vibrator is formed by splicing a metal substrate and a piezoelectric wafer; each piezoelectric wafer is arranged close to the corresponding limiting frame; the diverters are located between the two power generation units and the piezoelectric vibrators are close to the diverters; and the symmetrically arranged left plug flow plates and right plug flow plates are arranged close to the piezoelectric vibrators in the adjacent power generation units. The liquid-coupling excitation energy harvester has the advantages and characteristics that the liquid flow state is changed by the diverters and the plug flow plates to achieve excitation of the piezoelectric vibrators; a rigid contact impact is avoided; electromagnetic interference is avoided; an external fixed support is not needed; the liquid-coupling excitation energy harvester is especially suitable for the occasions free of the electromagnetic interference; the piezoelectric wafers only bear compressive stress action with a controllable range; the power generation capacity is high; and the reliability is high.

Description

technical field [0001] The invention belongs to the technical field of new energy and power generation, and in particular relates to a liquid coupling excitation energy harvester used for power supply of a wind generator blade monitoring system. Background technique [0002] Blades are the key components for wind turbines to receive wind energy and convert it into kinetic energy, which determines the reliability and service life of the generator. Wind turbine blades usually work in a harsh environment, and their own structural scale, weight and working load are very large. In addition to being damaged by irresistible natural disasters such as lightning strikes and earthquakes, natural corrosion, wear and fatigue stress, etc. Injuries are also inevitable. Practice has shown that one-third of the accidents that occur during the operation of wind turbines are caused by blade damage, so blade health monitoring is imperative. With the increasing length of fan blades and the ove...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problems existing in the power supply of the existing wind turbine blade monitoring system, the present invention proposes a liquid coupling excitation energy harvester for power supply of the wind turbine blade monitoring system

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