A piezoelectric fan with L-shaped skeleton membrane-covered blades

Abstract

The invention relates to a piezoelectric fan with laminating type blades. The piezoelectric fan comprises an elastic metal sheet and a piezoelectric ceramic sheet, wherein the piezoelectric ceramic sheet is bonded and fixed on the edge of one side of the elastic metal sheet, an upright support is arranged on the other side surface of the elastic metal sheet, and a thin film is arranged on one-quarter to one-half position of the upper portion of the support; the elastic metal sheet and the upright support form a L-shaped framework; and the material of the support is a PMMA organic material, andthe material of the thin film is polytetrafluoroethylene. The two sides of the piezoelectric ceramic sheet are connected to the positive electrode and the negative electrode of an alternating-currentdriving power supply, a power supply provides alternating voltage which is consistent with the system resonant frequency, and the piezoelectric ceramic sheet expands and contracts under the alternating voltage and then is subjected to displacement amplification through the L-shaped framework, so that wind sweeping and heat dissipation is realized on the thin film. According to the piezoelectric fan with the L-shaped framework laminating type blades, a grid-shaped support and the thin film are adopted to form a framework laminating type structure, so that good air impedance matching is realized, the end mass is not increased, air sweeping areas are increased, and the efficiency of air outlet and heat dissipation of the piezoelectric fan is improved.

Description

technical field [0001] The invention relates to a piezoelectric fan, in particular to a piezoelectric fan with an L-shaped skeleton film-covered blade, which belongs to the technical field of piezoelectric drive. Background technique [0002] Piezoelectric fans are usually composed of fan blades and piezoelectric ceramic sheets installed on the fan blades. The piezoelectric ceramic sheets are driven by voltage and the inverse piezoelectric effect, so that the piezoelectric ceramic sheets produce elongated and shortened geometric shapes in the direction of their own length. Deformation causes the fan blades to vibrate in bending. When the frequency of the AC voltage is equal to the natural frequency of the vibrating plate, the resonance of the two makes the amplitude of the overhanging end of the fan blade significantly increase, which can output high-speed, directional and stable airflow, resulting in ventilation and cooling effects. [0003] The blade structure of the exis...

AI Technical Summary

Problems solved by technology

For traditional blades, the amplitude and fundamental frequency are generally changed by changing the length of the blade: when the length is reduced, the fundamental frequency increases, but the amplitude drops sharply; when the length increases, the amplitude increases, but the fundamental frequency drops sharply. The structure of electric fan blades has coupling limitations of amplitude and fundamental frequency, it is difficult to give full play to the energy density of piezoelectric ceramic sheets, and piezoelectric fans cannot achieve the best performance

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