Aerzener Maschinenfabrik
The sound waves from the discharge side of this company’s Delta Screw compressor can reach 170–190 dB. Therefore, a downstream silencer is obligatory, as with other compressors. In conventional dissipative silencers, the high frequencies of the sound waves lead to considerable vibration forces, which have a damaging effect on the piping and the insulating material. This so-called microfriction wears out the filter material over time and can damage even stainless steel in the long run, thereby reducing the effectiveness of the silencer. The erosion of fine particles can also contaminate the process air. To eliminate these challenges, the company has patented a reactive silencer (photo). The special piping system generates a defined counter-noise, which superimposes the sound waves with a certain delay and thus neutralizes them. The company now also equips its direct-drive screw compressors with reactive silencers. — Aerzener Maschinenfabrik GmbH, Aerzen, Germany