| 摘要 |
PROBLEM TO BE SOLVED: To provide an exhaust gas recirculating(EGR) gas cooler using a heat conductive pipe where the cause of the bad conditions of an engine is removed beforehand by providing a projection within the heat conductive face, and increasing the disorder of the flow thereby raising the heat conductivity. SOLUTION: This is an EGR gas cooler where a group of heat conductive pipes consisting of plural pipes are fixed and arranged at a tube sheet 3, and the pipes are set and supported in the through holes of a supporting plate 5 whose periphery is fixed at plural places to the inwall of a drum pipe 1, and end caps which have an inflow port 8 and an outflow port 9 for EGR gas are fixed to outside of both ends of the drum pipe, and the drum pipe of which is provided with cooling medium inflow and outflow ports, and the heat conductive pipe has at least one spiral rib within, and this rib is processed from outside of the heat conductive pipe, and further a plate-shaped fin made of a band- shaped plate or a corrugated plate is inserted into the heat conductive pipe to touch internally the rib, or the plate-shaped fin is made, being twisted in the opposite direction to the spiral direction of at least one spiral rib of the heat conductive pipe. |
