Self-excitation wheel type piezoelectric power generator for blade monitoring system of wind power generator

Abstract

The invention relates to a self-excitation wheel type piezoelectric power generator for a blade monitoring system of a wind power generator, and belongs to the piezoelectric power generation field. A left wall plate, a right wall plate and a flow divider are arranged on the main shaft in a sleeving manner, and a pressing plate is arranged at the end part of the main shaft; a metal substrate is crimped between the shaft sleeve of the left wall plate and the shaft sleeve of the flow divider, and between the shaft sleeve of the right wall plate and the shaft sleeve of the flow divider; the left wall plate shaft sleeve, the right wall plate shaft sleeve, the flow divider shaft sleeve and the metal substrate are connected with the main shaft through flat keys; each cantilever beam on the metal substrate and each glued piezoelectric crystal plate form a piezoelectric vibrator; the piezoelectric vibrators on the two sides of the flow divider are symmetrically mounted; a left flow-pushing plate and a right flow-pushing plate are mounted symmetrically left and right; the left and right ends of the shell are connected with the left and right wall plates; the left and right wall plates, the shell and the flow divider shaft sleeve jointly form the cavity of the power generator; and the cavity is filled with a liquid. The self-excitation wheel type piezoelectric power generator has the advantages and characteristics as follows: the flowing state of the liquid is changed through the flow divider and the flow-pushing plates so as to realize vibration excitation of the piezoelectric vibrators; the piezoelectric power generator is free of rigid contact impact, electromagnetic interference, and external fixing and supporting; the piezoelectric power generator can be used as an independent part to be placed on the blade or the rotary shaft; and the piezoelectric power generator is particularly suitable for a wireless sensing monitoring system which requires a non-electromagnetic interference condition.

Description

technical field [0001] The invention belongs to the technical field of new energy and power generation, and in particular relates to a self-excited wheel piezoelectric generator for a wind power 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 overall number of f...

AI Technical Summary

Problems solved by technology

However, the power supply problem of the existing sensor monitoring system has not been well resolved, so it is difficult to popularize and apply it on a large scale, because the sensor monitoring system needs to be installed on the blade and rotate with the blade, and cannot provide electrical energy through the wire, and the battery is used The power supply needs to be shut down frequently to replace the battery, so a variety of piezoelectric generators have been proposed to power the monitoring system

The characteristic of most of the existing rotary piezoelectric generators is that the effective excitation of the piezoelectric vibrator must be achieved through the relative rotation between the "fixed parts" such as bearing housings or bearing covers and the "rotating body" of the shaft, which cannot be used for "unfixed parts". In addition, most of the piezoelectric generators used in the existing wind turbine blade monitoring system use magnetic coupling to achieve non-contact excitation. Electromagnetic interference will reduce the accuracy and real-time performance of wireless monitoring signals. Even cause the monitoring system to fail to work properly

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