| 摘要 |
PURPOSE:To make it possible to prevent the damage at a caulking part by changing the arrangement of shaved-up parts of a turbulence body within the heat exchanger to suppress the turbulent flow on the upstream side of a secondary heat exchanger. CONSTITUTION:Shaved-up parts 14 of a turbulence body 13 inserted into a secondary heat exchanger 6 are disposed by being concentrated at the downstream part of the secondary heat exchanger 6, or they are arranged coarsely at the upstream part, while being arranged densely at the downstream part whereby the turbulence flow of combustion gas at the upstream part, and the heat absorbing quantity of an inner fin 7 is reduced and the increase in the temperature at the upstream part of an extruded shape 8 is suppressed. Therefore, damage in the caulking part 10 accompanied by the lowering of thermal stress of an aluminum material, can be prevented. |
