指数复合型低频压电雾化喷头的设计

Design of Exponential Composite Low Frequency Piezoelectric Atomizing Nozzle

设计一种频率为40 kHz的指数复合型低频压电雾化喷头,建立有限元模型,通过喷头模型的模态分析和谐响应分析来测定喷头模型的振动形态、谐振频率和雾化振幅。模态在八阶时喷头为纯拉伸状态,谐振频率为39 550 Hz,在设定电压为26 V时,仿真得到雾化振幅为3.9μm。采用德国Polytec高性能单点式激光测振仪测得喷头样机的振动幅值为3.94～4.32μm,误差小于10%,符合设计的要求。采用马尔文Spraytec型激光粒度仪对样机雾滴均匀性进行测量,当驱动电压为26 V时,喷头雾化产生的雾滴直径为SymbolFC@(30～95)μm,占比超过85%,结果表明,该喷头雾化液滴分布较均匀。

An exponential composite lowfrequency piezoelectric atomizing nozzle with a frequency of 40 kHz was designed.The finite element model was established,and the vibration mode,resonance frequency,and atomization amplitude of the nozzle model were determined by modal analysis and harmonic response analysis of the nozzle model.When the mode was at the eighth order,the nozzle was in a purely tensile state with a resonant frequency of 39 550 Hz.When the voltage was set to 26 V,the simulated atomization amplitude was 3.9 μm.The vibration amplitude of the nozzle prototype measured by German Polytec high-performance single-point laser vibrometerranged from 3.94 μm to 4.32 μm,the error was less than 10%,which met the design requirements.The Malvine Spraytec laser particle size analyzer was used to measure the droplet uniformity of the prototype.When the driving voltage was 26 V,the droplet diameter generated by the nozzle atomization was Ф(30~95)μm,accounted for more than 85%.The results showed that the droplet distribution of the spray nozzle was uniform.