Vortex-excitation piezoelectric energy harvester for monitoring wind power gear box

The invention relates to a vortex-excitation piezoelectric energy harvester for monitoring a wind power gear box, and belongs to the field of piezoelectric power generation. A main shaft is sequentially sleeved with a left wall plate, a left shaft sleeve, a rim, a right shaft sleeve and a right wall plate from left to right; a baffle plate is arranged at the end part; the left side of an inner ring of a bearing on the left wall plate abuts on a shaft shoulder; the right side of the inner ring of the bearing on the right wall plate abuts on the baffle plate; a certain included angle exists between a blade and a bus of the rim; two ends of the shell are connected with the left wall plate and the right wall plate respectively; a balancing weight is arranged on the outer wall of the shell; a limiting frame and a piezoelectric vibrator are arranged at the left end and the right end of the shell; the length and the width of a piezoelectric wafer are smaller than those of a hollow cavity of the limiting frame respectively; and the length and the width of a metal substrate are greater than those of the hollow cavity of the limiting frame respectively. The vortex-excitation piezoelectric energy harvester has the advantages and characteristics that the piezoelectric vibrator is excited by fluid motion caused by rotation to generate electricity; rigid shock and electromagnetic interference are avoided; the piezoelectric wafer only bears pressure stress with a controllable range; the reliability is high; fixed support is not needed; and the vortex-excitation piezoelectric energy harvester can be applied to cantilever gear shaft and multi-gear coaxial occasions.