螺杆空压机用消声器的设计和优化

Design and Optimization of Muffler Used in Screw Air Compressor

高转速的干式螺杆空压机的排气管路中的噪声都比较大,为了有效降低螺杆空压机的排气噪声,利用双层微穿孔板声学理论,建立了由微穿孔板的孔径、板厚、穿孔率、腔深等结构参数计算双层微穿孔板结构扩散场吸声特性的数学模型,设计了一种适合该类空压机用的消声器,并利用遗传算法对其结构参数进行优化,得到双层微穿孔板最佳的吸声特性。优化结果表明:优化后的双层微穿孔板消声器的吸声系数比优化前大大提高,更有利于高转速干式螺杆空压机减噪的需求。

The acoustic noise in the discharge line of high rotation speed and oil-free screw air compressor is very high. In order to reduce the noise level, the muffler is necessary for using in the compressor. Based on the double layer micro-perforated plate acoustic theory, the model for designing the sound absorption performance of double layer micro-perforated panel muffler is established in this paper. By this model, the sound absorption characteristics of this kind of muffler in diffusion field under different aperture, thickness, perforation rate, cavity depth of micro-perforated plate can be obtained. And the muffler applied in the oil-free screw air compressor has been optimized by the genetic algorithm optimization method. The result shows that the sound absorption performance of the muf- fler optimized is improved greatly than one designed by the traditional method. This optimized double layer micro-perforated panel muffler will meet the requirement of noise reduction application better.