The invention relates to a high-performance piezoelectric
longitudinal vibration energy harvester, and belongs to the technical field of
new energy. An outer
barrel is arranged between check rings of a support platen and a cover plate through screws, and an inner
barrel is pressed between counter bores of the support platen and the cover plate. An
inertia block is formed by two
mass blocks, a
magnet ring and a nut jointly, sleeved with the inner
barrel, and connected with the support platen through a spring. Two
metal sheets with piezoelectric plates adhering to the arc convex sections of the
metal sheets are riveted and then form piezoelectric vibrators, and energy
converters are formed by the piezoelectric vibrators, wedge blocks and
magnet blocks, wherein the wedge blocks and the
magnet blocks are riveted to the two ends of each piezoelectric vibrator. The wedge blocks of the two energy
converters are installed in dovetail grooves in the inner wall of the outer barrel, and guide posts of the magnet blocks are arranged in two radial through holes in the side wall of the inner barrel respectively. The magnet blocks are installed close to opposite
magnetic poles of magnet rings. The high-performance piezoelectric longitudinal vibrating
energy harvester has the advantages that the piezoelectric plates only bear
pressure stress, the deformation direction of the piezoelectric vibrators is perpendicular to the vibrating direction, deformation is not directly related to the
mass of the
inertia block, and a two-freedom-degree
system is formed by the energy
converters and an
inertia block-
spring system, so that reliability is high, inherent frequency is low, and the
effective frequency band is wide.