摘要
本論文研究是「微薄型鼓風器設計」，為設計一具新型之微型壓電式冷卻散熱裝置。壓電元件符合所需之小體積但高功率輸出、低耗能、及低噪音等優點，被視為下世代最具潛力的散熱商品之一，可應用於平板電腦、手機等薄型手持式電子設備。不同於使用懸臂樑結構之壓電式風扇，利用壓電致動元件設計微型鼓風器，可製作微型尺寸但產生較大氣流量，非常適合於狹小空間之散熱應用，增加排風量及噴流速度為壓電式散熱系統之功能指標。腔體使用一組壓電振動元件及操作於超音波頻率範圍，以增加排風量及噴流速度並可有效降低噪音，達成可由上方氣孔吸入氣再由另一端腔體排出氣體，以獲得良好之散熱冷卻效果，是相當複雜且具挑戰的設計工作。通過設計適當流道，使吸入與排出的空氣連續並與震動方向垂直流動。通過實驗施加40Vpp電壓與頻率於24.258kHz，可產生14.2μm之振幅。由於具有尺寸小重量輕和噪音小之優點，適合安裝在攜便式電子設備的狹小空間內，以用於設備未來散熱解決方案。
並列摘要
In this article, An Ultrasonic-driving Miniature Cooling System is designed to propose a solution for heat dissipation in very small space. Piezoelectric device has the advantages of high power generation in small dimension, low power consumption, and less noise is an ideal candidate to solve the problem of heat dissipation in limited space, which becomes an attractive and challenging research topic, can use for heat dissipation in very small space of computer tablet, mobile phone, and handheld electronic devices. Different from the piezo fan constructed as a cantilever beam, piezoelectric-driven blower can be built to miniature size and produce large airflow is suitable for the application purpose. Increasing air flow and jet velocity in the major target of the micro blower. Chamber design and operating at ultrasonic frequency is a feasible solution. Chamber is employed and driven with an independent piezoelectric actuator. It is a complicated and challenging task to draw air into the entry chamber then effectively pump out air in via its output. By means of appropriate flow passage design on the piezoelectric-driven blowers, suction and exhaust air will mutually and continuously generate and flow in the direction perpendicular to the vibration direction of the blower. By applying a voltage of 40Vpp and a frequency of 24.258kHz through experiments, an amplitude of 14.2μm can be generated. For having the advantages of miniature dimension, light weight, and less noise, the designed cooling system is suitable to fit inside a small and thin space of portable electronic devices for the future thermal solution of these devices.