嵌入消声功能的低噪声罗茨鼓风机壳体设计  

Shell Design of Integrated Noise-reduction Function Low-noise Roots Blower

作　　者：熊维德[1] 

机构地区：[1]四川文理学院物理与机电工程学院,四川达州635000

出　　处：《电声技术》2014年第10期56-60,共5页Audio Engineering

基　　金：四川省教育厅自然科学基金项目(2008ZA134)

摘　　要：为摘罗茨鼓风机“噪声王”之帽,提出了壳体与消声器一体化的理念.采取主动吸声降噪措施,从源头降低产生噪声的概率,改变现有罗茨机在产生噪声后,不得不另加消声器控制的滞后被动方法.解决了现有消声器只能降低管道内气流噪声,不能降低壳体振动对壳外空间辐射噪声的问题.采用弧形内壁一体化设计,促使噪声成为无规入射,改变现有直筒消声器掠入射方式,避免高频失效问题;巧用多层微穿孔板各层错开吸声频率,空腔深度渐变等技术,拓展消声频带,使消声量得到大幅提升.它比现有同流量、同压力罗茨机的噪声低20～35 dB（A）;体积约缩小为同等参数罗茨机系统的40％,节约了成本,节省了放置空间.To take off the hat of Roots blower＇s noise king, the concept about making the integration of the shell and the mufler is put forward in another way. It is adopted the positive sound - absorption andnoise - reduction method to reduce the noise frequency from the source. At the same time, it changes the situation that when the noise occurs in the Blower, the muffler had to be added to lower down the noise. It also solves the problem that the current muffler can only reduce the air - flow noise in the pipe, but the surrounding space radiation noise which is from the shell vibration can not be avoided. Integrated design with curved walls is also used, which forces the noise to insert without regulation, and change the existing insert method from the straight muffler; Many new noise -reduction methods are used such as micro -perforated panel and the gradual change of cavity depth to vary the sound - absorption frequency ; the noise - reduction frequency can be expanded and the sound - reduction volume can be improved substantially. The noise of Blower is 20 - 35 dB（ A ） lower than the current ones,which are the same flow,the same pressure;it reduced to a volume of about forty percent of blower system, compared with the same specifications, saving costs and improved the efficiency.

关 键 词：嵌入壳体 主动吸声 降低结构声 无规入射 腔深渐变 互补吸声 

分 类 号：TB53[理学—物理]