Composite piezoelectric-thermoelectric automobile exhaust gas micro energy collector

Abstract

The invention provides a composite piezoelectric-thermoelectric automobile exhaust gas micro energy collector. One end of a cantilever beam is fixedly connected to a support base, and the other end extends along a horizontal direction to form a free end. A mass block is fixed at the free end of the cantilever beam. A piezoelectric sheet is fixed on an upper surface of the cantilever beam. Film electrodes are respectively located on the upper and lower surfaces of the piezoelectric sheet. A heat radiation piece is fixed to the upper surface of an upper film electrode. An energy collector is placed on an outer tube wall of an automobile exhaust pipe. The cantilever beam is subjected to the vibration of an automobile to generate vibration, and the piezoelectric sheet senses the vibration of the cantilever beam to generate an electric charge which is taken out by the film electrodes. The lower surface of the piezoelectric piece receives the heat of exhaust gas conducted from an exhaust tube wall, the heat radiation piece is placed on the upper surface of the upper film electrode, thus a temperature change is caused on the piezoelectric sheet, the charge is generated by a pyroelectric effect and then is led out through film electrode leads, and power is supplied to a gas monitoring sensor.

Description

technical field [0001] The invention belongs to the field of miniature energy collection, in particular to an energy collector based on the coupling of piezoelectric effect and pyroelectric effect. Background technique [0002] Gas monitoring sensors in automobile exhaust pipes are of great significance for environmental protection and improving resource utilization. The way the lithium battery works is due to its limited battery capacity and battery life, and frequent replacement will bring great inconvenience. As a result, researchers have come up with self-powered solutions such as piezoelectric, pyroelectric, and electrostatic, which absorb energy from the surrounding environment and convert it into electricity. For example, in 2014, Tianjin University proposed the waste heat recovery thermoelectric power generation design of automobile exhaust, which can effectively absorb the waste heat in automobile exhaust and convert it into electric energy output; It works at the ...

AI Technical Summary

Problems solved by technology

[0003] The invention proposes a composite piezoelectric-thermoelectric automobile exhaust micro-energy collector, which supplies power to the gas monitoring sensor in the automobile exhaust pipe. The device can not only collect the vibration energy of the automobile, but also collect the waste heat in the exhaust gas, which is convenient It is flexible and solves the problem of single energy supply. Even if one energy source is temporarily interrupted due to factors such as the environment, the other energy collection can work normally and complement each other. At the same time, the organic combination of the two improves the collection efficiency of the energy harvester

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