| 摘要 |
PURPOSE: A smoke reducing device is provided to prevent the leakage of harmful gas at the joint of cases by employing a fastening unit including fixing rings on the exterior of the cases. CONSTITUTION: A smoke reducing device comprises a first case(140) with an opening on an end, a second case(160) with a joint connected to the opening, and a fastening unit(200) that couples the first and second cases. The fastening unit comprises a first fixing ring that is welded to the exterior of the first case, a second fixing ring that is welded to the exterior of the second case, a sealing member that is interposed between the first and second fixing rings, and a clamp that fastens the first and second fixing rings and the sealing member.
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