| 摘要 |
PURPOSE:To prevent a crack in a trap while excessive accumulation of particulates due to a lapse of time, by dividing the trap into plural parts with respect to the face in a flow path direction further providing an optional clearance in said divided face so as to form a release space from thermal expansion of the trap. CONSTITUTION:Exhaust, allowed to flow in inlet side opening cells 9A and pass through a porous thin wall 8 and through a neighboring outlet opening cell, is discharged to the downstream side of a trap 10. Here particulates are collectively caught by the porous thin wall 8, but the particulates, if its amount exceeds a certain value, is burnt by a burner, reproducing the trap 10. A crack can be prevented from its generation because a trap 10A and a trap 10B, even if they are thermally expanded by combustion heat when the trap is reproduced, are absorbed by a clearance 11. While a pressure rise of exhaust in the upstream of the trap 10 can be prevented because the exhaust is mostly discharged through the clearance 11 if an accumulation amount of the particulates increase above a certain value. |
