发明授权
US08272475B2 Sound attenuator for low frequencies, method for manufacturing sound attenuator for low frequencies and system for attenuating low frequencies for example in air-conditioning ducts of paper mills
有权
用于低频的声音衰减器，用于制造用于低频的声音衰减器的方法和用于衰减低频的系统，例如在造纸厂的空调管道中
- 专利标题： Sound attenuator for low frequencies, method for manufacturing sound attenuator for low frequencies and system for attenuating low frequencies for example in air-conditioning ducts of paper mills
- 专利标题（中）： 用于低频的声音衰减器，用于制造用于低频的声音衰减器的方法和用于衰减低频的系统，例如在造纸厂的空调管道中
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申请号： US12990185申请日： 2009-04-28
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公开(公告)号： US08272475B2公开(公告)日： 2012-09-25
- 发明人: Kalle Helenius , Henrik Pettersson
- 申请人： Kalle Helenius , Henrik Pettersson
- 申请人地址： FI Helsinki
- 专利权人： Metso Paper, Inc.
- 当前专利权人： Metso Paper, Inc.
- 当前专利权人地址： FI Helsinki
- 代理商 Cozen O'Connor
- 优先权： FI20085397 20080430
- 国际申请： PCT/FI2009/050334 WO 20090428
- 国际公布： WO2009/133240 WO 20091105
- 主分类号： E04F17/04
- IPC分类号： E04F17/04 ; E04B1/86 ; E04B1/84 ; E04B1/82 ; E04B1/74
摘要：
A sound attenuator for low frequencies in an air-conditioning duct of paper mills includes a sound attenuator frame insertable in the air-conditioning duct. At least one attenuator member operating according to the plate resonator principle has a first resonator plate, a framework, whereto the first resonator plate is attached by its inner surface, and a second plate, which is essentially parallel to the first resonator plate. The second plate is attached to the framework by its inner surface, whereby the second plate, the framework and the first resonator plate delimit at least one attenuator unit. The first resonator plate, attached to the framework, is a steel plate and is attached to the framework by laser welding and the framework comprises a pressure balancing opening.
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