压缩机隔声罩吸声性能提升与验证

Sound absorption performance improvement and verification of compressor acoustic enclosure

基于压缩机降噪技术研究需求,为有效降低压缩机本体辐射噪声水平,应用声学阻抗管法测试并对比不同吸声材料材质、吸声材料厚度、PVC厚度的吸声系数,确定压缩机隔声罩材料选型设计的关键点,进而设计具有高吸声性能的压缩机隔声罩,优化后的隔声罩使压缩机本体辐射噪声水平降低1.2~2.8dB(A);应用声强声源定位技术,测试压缩机本体包裹隔声罩前后表面声源分布,确定压缩机隔声罩在底脚避让处存在明显漏声,通过密封底脚处避让设计与压缩机底部增加隔声罩等措施,改善隔声罩的密封设计,使压缩机100 Hz运转时的噪声水平进一步降低1.7dB(A)。

Based on the requirements of compressor noise reduction technology,in order to effectively reduce the radiated noise level of the compressor body,the acoustics impedance tube method is used to measure the sound absorption coefficients of various sound absorption materials,thickness of sound absorption material and PVC thickness,the key points of the selection and design of the compressor acoustic enclosure's material are determined.Then the design of the compressor acoustic enclosure with high sound ab-sorption performance is optimized,and the optimized acoustic enclosure can reduce the ra-diated noise level of the compressor body by 1.2-2.8 dB(A).Using sound intensity and sound source localization technology,the sound source distributions before and after the compressor body is wrapped around the acoustic enclosure are tested,and it is determined that the compressor acoustic enclosure has obvious sound leakage at the foot avoidance.By sealing the foot avoidance design and adding a acoustic enclosure at the bottom of the com-pressor to improve the sealing design of the acoustic enclosure,the noise level of the com-pressor is further reduced by 1.7 dB(A)when the compressor is running at 100 Hz.