A Rotationally Excited Friction-Piezoelectric Composite Generator

Abstract

The invention relates to a rotationally excited friction-piezoelectric composite generator, which belongs to the technical field of new energy sources. The end cover is installed at the end of the cylinder, and the rotating shaft is installed on the end cover and the bottom of the shell; the swing ring of the exciter is set on the fixed ring, and there is an axial inclination between the fixed ring and the axis of the swing ring, and a dial ring is arranged on the outer edge of the swing ring. Both sides of the ring are equipped with paddles, the fixed ring is installed on the rotating shaft and rotates with the rotating shaft; the two brackets and the spacer ring are installed on the inner side of the shell, the bracket is composed of a ring plate and a guard plate, and the convex surface of the guard plate is provided with Composite film composed of friction layer and electrode layer; a piezoelectric vibrator is crimped between the ring plate of the bracket and the spacer ring, the substrate of the piezoelectric vibrator is installed close to the friction layer, and the piezoelectric vibrator and the composite film constitute a friction pair; The paddle on the side is located between two axially adjacent piezoelectric vibrators; when the shaft rotates, the paddle forces the piezoelectric vibrator to reciprocally bend and deform, and repeatedly contacts and separates from the composite film, the substrate of the piezoelectric vibrator and the piezoelectric vibrator The piezoelectric power generation end is formed between the sheets, and the friction power generation end is formed between the substrate and the composite film.

Description

technical field [0001] The invention belongs to the technical field of new energy and energy recovery, and in particular relates to a rotationally excited friction-piezoelectric composite generator for collecting wind energy, water flow and kinetic energy of a rotating body. Background technique [0002] In recent years, real-time health sensing monitoring technology for high-rise buildings, bridges, large and high-speed rotating machinery has been widely used. In addition, the monitoring of river water quality pollution, flood prevention and early warning, and air pollution has been highly valued by relevant state departments. Domestic experts and scholars have successively proposed corresponding monitoring methods and means, such as water quality monitoring technology for river water pollution, flood control Monitoring technologies such as rainfall, water level, and river water velocity for natural disasters such as landslides and mudslides. At the same time, in order to ...

AI Technical Summary

Problems solved by technology

From the perspective of practical application, various types of generators currently proposed still face many technical bottlenecks. The common problems are summarized as follows: ① low power generation capacity and energy density per unit volume; Low adaptability to flow velocity, vibration frequency and rotating body speed, ③low reliability, such as piezoelectric ceramics are easily damaged due to excessive environmental vibration intensity, and sliding friction generators are easy to fail due to friction and wear between friction pairs. ④There is electromagnetic interference , such as electromagnetic generators, nonlinear piezoelectric and friction generators based on magnetic coupling auxiliary excitation, there is a certain magnetic field when they work

Of course, it is still difficult to solve all the above-mentioned problems in the same generator

The common feature of pure piezoelectric generators and friction generators is that they have no electromagnetic interference, so they are more suitable for wireless sensor monitoring systems, and their respective power generation capabilities, reliability and environmental adaptability need to be further improved

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