| 摘要 |
PROBLEM TO BE SOLVED: To provide a differential pressure damper for pressurization smokeproofing capable of stably providing a desired characteristic over a long time with a simple structure. SOLUTION: This differential pressure damper for pressurization smokeproofing is arranged in an opening 3b of a staircase door partitioning a pressurized region pressurized into a positive pressure state in a fire from a non-pressurized region. In the differential pressure damper for pressurization smokeproofing, vanes 14 are rotatably arranged around support shafts 13; the opening 3b is closed in a state where the vanes 14 are located at non-rotating positions; and at least a part of the opening 3b is opened in a state where the vanes 14 are rotated by mutual differential pressure between the pressurized region and the non-pressurized region. The damper is formed such that moment for rotating the vanes 14 toward the non-rotating positions is always applied to the vanes 14, and the moment is reduced as the rotating angle of each vane 14 is increased. COPYRIGHT: (C)2009,JPO&INPIT
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