Patent ID: 8286422

Claim:
An apparatus for cooling overheated gas generated from a diesel particulate filter which is connected between a diesel engine and an exhaust pipe of the diesel engine, the apparatus comprising: a tail pipe for discharging outwardly the overheated gas discharged from the diesel particulate filter; a cooling fan, provided at one side of an engine room, for generating an air stream by sucking ambient air; and a diffuser enclosing an outer circumference of the tail pipe in such a way a space is formed between the diffuser and the tail pipe to prevent the diffuser from directly contacting the tail pipe; wherein the engine room is provided with a through-hole penetrating one side of the engine room; and wherein the tail pipe has one end connected to the diesel particulate filter, and the other end extended outwardly from the engine room through the through-hole; wherein the tail pipe comprises guide means for smoothly guiding the air stream generated by the cooling fan into the tail pipe and for preventing the overheated gas from flowing back into the engine room, and wherein the diffuser comprises means for mixing the air stream generated by the cooling fan with the overheated gas discharged from the tail pipe or for guiding the air stream into the tail pipe such that the diffuser is adapted to lower a temperature of the overheated gas.