往复式真空泵管道噪声抑制技术研究

Noise suppression of reciprocating vacuum pump pipelines

往复式真空泵工作噪声大,声品质不佳。为了提升真空泵运行时的声品质,针对往复式真空泵出气口的管道噪声进行研究。首先采集真空泵出口处的噪声,得到真空泵噪声的频域特性,发现真空泵出口处噪声主要集中在0~4000 Hz频率段;然后针对该频率段设计降噪方案,采用消声器串联的方式,消除传递损失曲线的通过频率,并利用Virtual Lab软件对串联消声器的声学性能进行仿真分析;最后将消声方案安装在真空泵出口处进行噪声验证,并进行气体流量损失的实验验证。结果表明,串联消声器对真空泵出口处的降噪效果达25 dB(A)以上,气体的流量损失为9.8%。研究结果对提升真空泵声品质具有借鉴意义。

Reciprocating vacuum pump working noise,sound quality is not good.In order to improve the sound quality of vacuum pump during operation,the pipe noise of air outlet of reciprocating vacuum pump is studied.Firstly,the near field noise at the outlet of the vacuum pump was collected to obtain the frequency domain characteristics of the vacuum pump noise.It was found that the noise at the outlet of the vacuum pump was mainly concentrated in the 0~4000 Hz frequency band.Then,the noise reduction scheme was designed for the frequency segment,and the muffler series was adopted to eliminate the passing frequency of transmission loss curve,and the Virtual Lab software was used to simulate the performance of the series muffler.Finally,the design scheme was installed at the outlet of the vacuum pump to verify the noise,and the experimental verification of gas flow loss was carried out.The results show that the noise reduction effect of the series muffler on the outlet of the vacuum pump is more than 25 dB(A),and the gas flow loss is 9.8%.The research results can be used for reference to improve the sound quality of vacuum pump.