一种新型热声制冷机声驱动器的设计与实验研究

Design and experimental study of a new type of acoustic driver for thermoacoustic refrigerators

为了满足热声制冷机声驱动器对高声强声源的需求,通过简化声驱动器驱动机构的各个零部件结构、连接方式,并考虑零部件的材质性降低驱动器运转时的惯性力,设计了一款强力且性能稳定的微型声驱动器,可应用于小型制冷机的实验研究。通过实验采集了驱动器在基频145 Hz、振幅0.5 mm下热声制冷机谐振腔内的声压、振速值,发现声压值最高可达70多Pa,振速可达0.5 m/s。此结果表明该声驱动器可以提高热声制冷机谐振腔内声场强度。

In order to meet the demand of high-intensity sound sources for the acoustic driver of thermoacoustic refrigerators,the inertia force of the driver during operation was reduced by simplifying each component’ s structure of driving mechanism of the acoustic driver,the connection method of the components as well as considering the material properties of the components. Furthermore,a powerful and stable micro-acoustic driver was designed,which could be applied to the experimental research of small refrigerators. Through experiments,the sound pressure and vibration velocity in the resonant cavity of the thermoacoustic refrigerator were collected at the fundamental frequency of 145 Hz and the amplitude of 0. 5 mm. It was found that the maximum sound pressure value can reach more than 70 Pa,and the vibration speed can reach 0. 5 m/s. This result indicates that the acoustic driver can improve the sound field intensity in the resonant cavity of the thermoacoustic refrigerator.