| 发明名称 |
Double-walled structure in a ventilation duct system |
| 摘要 |
A double-walled structure in a ventilation duct system has an inner tube and an outer tube and, arranged therebetween, a sound-absorbing material. The inner tube is a helically-wound lock-seam tube (2') formed from a sheet metal strip (7') having parallel longitudinal areas (23) of expanded metal. |
| 申请公布号 |
SE9802490(D0) |
申请公布日期 |
1998.07.10 |
| 申请号 |
SE19980002490 |
申请日期 |
1998.07.10 |
| 申请人 |
LINDAB AB |
发明人 |
KENT *HULTBERG;TEUVO *RANTA;HANS *LARSSON |
| 分类号 |
B21C37/12;F16L59/14;F24F13/02;F24F13/24;(IPC1-7):F01N/ |
主分类号 |
B21C37/12 |
| 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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