发明名称 |
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 |
摘要 |
<p>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.</p> |
申请公布号 |
EP2300752(B1) |
申请公布日期 |
2015.10.14 |
申请号 |
EP20090738277 |
申请日期 |
2009.04.28 |
申请人 |
VALMET TECHNOLOGIES, INC. |
发明人 |
HELENIUS, KALLE;PETTERSSON, HENRIK |
分类号 |
F24F13/24;F16L55/033;G10K11/172 |
主分类号 |
F24F13/24 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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