The acoustic attenuator for low frequency, the method of producing the acoustic attenuator for low frequency, and, for example, the system in order for the inside of the air conditioning duct of the paper manufacture factory to be attenuated low frequency

摘要

As for this invention, for example, the duct (2) the flow which advances inside (20), in order to pass inside the acoustic attenuator, it is possible for the air conditioning duct of the paper manufacture factory the acoustic attenuator for low frequency in regard to (1), to be arranged, the acoustic attenuator includes the acoustic attenuation frame (3), as for the acoustic attenuation frame, it is possible to be arranged in connection with the air conditioning duct the acoustic attenuation frame includes the flow duct which is arranged in connection with the acoustic attenuation frame (4) and following to board resonance principle, at least one which operates attenuation component (5). The attenuation component includes the first resonance board (6), external surface of the first resonance board flows and is constituted, as been the inner wall of the duct, namely, the flow is formed, includes in order to advance according to the aforementioned external surface framework (7), the first resonance board is installed in framework by the surface inside that, includes the second board, the second board the first resonance board substantially is parallel. The second board is installed in framework by the surface inside that, the second board, framework, and, one attenuation unit (10) boundary attaches the first resonance board, at least with that. The first resonance board which is installed in framework is the steel sheet, the first resonance board, using laser welding, is installed in framework, framework includes pressure balance opening (11). As for this invention, furthermore, method in order the acoustic attenuator for low frequency to produce (1), and, for example, the air conditioning duct of the paper manufacture factory (2) it regards the system in order low frequency to be attenuated in inside.