半封闭变频螺杆制冷压缩机降噪方法及试验

Design and Experimental Research of Noise Reduction Method for Semi-hermetic Variable Frequency Twin-screw Refrigeration Compressor

变频螺杆制冷压缩机因其部分负荷节能特性已成为一种螺杆制冷压缩机的发展趋势,宽频的脉动噪声是限制其市场应用与竞争力的关键因素。基于变频螺杆制冷压缩机结构特点与噪声原理,提出排气端面脉动衰减装置和排气管路消声器两种降噪设计方法,并通过试验研究分别验证了各降噪方法的有效性。研究结果表明,排气端面衰减装置对压缩机不同位置的噪声都有衰减作用;排气管路消声器只对排气侧噪声有显著削弱;同时采用两种降噪方法后,压缩机不同转速下平均降噪效果能达到5.0~10.0dBA,压缩机运行噪声不高于85.5dBA,且压缩机平均降噪效果随转速增加而增强。基于上述研究结果,排气端面脉动衰减装置和排气管路消声器两种降噪方法都能降低排气侧基频和倍频噪声,进而促进变频螺杆制冷压缩机的技术发展。

Variable frequency twin-screw refrigeration compressors have become a development trend of twin-screw refrigeration compressors due to its part-load energy-saving characteristics.Broad frequency pulsation noise is becoming the key limitation of its market application and competitiveness.Based on the structural characteristics and noise principle of the variable frequency twin-screw refrigeration compressor,two noise reduction methods are proposed.One is the discharge end pulsation damping device and the other is the discharge pipe muffler.An experimental study is carried out to verify the effectiveness of each method.The results show that the discharge end attenuation device can attenuate the noise at different positions of the compressor.The discharge pipe muffler can only significantly reduce the discharge side noise.After adopting two noise reduction methods at the same time,the average noise reduction effect of the compressor at different rotating speeds can reach 5.0~10.0 dBA,and the running noise of the compressor is no higher than 85.5 dBA.In conclusion,the two noise reduction methods of the discharge end pulsation damping device and discharge pipe muffler can reduce the base frequency and double frequency noise of the discharge side,which will promote the technical development and application of variable frequency twin-screw refrigeration compressors.