Double-member alternating-working piezoelectric fan insulation structure and electric fan thereof

Abstract

The invention discloses a double-member alternating-working piezoelectric fan insulation structure and an electric fan thereof. The structure is a three-layer insulation structure arranged at the external side of a piezoelectric fan and comprises a bottom layer insulation layer, a high-molecular adhesive tape and a top layer insulation layer. The bottom layer insulation layer is connected with the piezoelectric fan chip. The high-molecular adhesive tape adheres the bottom layer insulation layer and the top layer insulation layer. The three-layer structured composite insulation layer is adopted so that a situation that insulation performance of the piezoelectric fan cannot be guaranteed due to fatigue cracking of material caused by long time of bending and deformation of single-layer single insulation material and finally the piezoelectric fan fails to work can be overcome; and a situation that insulation performance reduces due to separation between the piezoelectric fan chip and the insulation layer caused by weak wrapping of the insulation layer because of difference of thermal expansion coefficients when single material wraps multiple materials and then the piezoelectric fan fails to work early can also be overcome. The three-layer structured composite insulation layer is adopted so that internal stress of the single-layer structured insulation layer can be greatly reduced, affinity with the piezoelectric fan chip is enhanced and combination of the insulation layer and the chip is enabled to be firmer.

Description

technical field [0001] The invention belongs to the technical field of piezoelectric fans, and in particular relates to an insulation structure of a two-body alternately working piezoelectric fan and the fan. Background technique [0002] The high insulation of the two-body alternating working piezoelectric fan for power device cooling is an important guarantee for the piezoelectric fan to work normally for a long time in harsh environments. Because the piezoelectric fan resonates through the piezoelectric ceramics, the high-frequency vibration signal is transmitted and amplified through the metal amplifier, so that the metal amplifier swings back and forth in a large range, and the effect of directional heat dissipation is achieved. Because the blade of the piezoelectric ceramic fan is composed of two piezoelectric ceramic sheets, a composite material in the middle and a metal amplifier. The thickness of these three materials is relatively thin, and the distance between th...

AI Technical Summary

Problems solved by technology

The thickness of these three materials is relatively thin, and the distance between the electrodes is only about 0.2 mm. When the fan is working, the driver voltage is relatively high (85~160V), and it is extremely difficult to meet the moisture in the air or small particles that can conduct electricity. It is easy to reduce the insulation, and even cause a short circuit in severe cases

Especially in harsh environments, such as equipment used at sea, it is difficult to guarantee the general single-layer insulation

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