| 摘要 |
PROBLEM TO BE SOLVED: To provide a core structure of a heat exchanger capable of preventing damage of tubes by reducing pressing force toward the tubes of tube plates. SOLUTION: In the core structure of the heat exchanger, tubes 3 and corrugated fins 4 are alternately arranged between tube plates 2 arranged opposite to each other with a predetermined space interposed therebetween. End portions 3c of the tubes 3 are inserted into tube holes 2b formed respectively in each of the top and bottom tube plates 2 to be fixed. On the tube plates 2, there are provided connection portions 2c having wall portions 2f slanting from main body portions 2h thereof toward the tubes 3. When a thickness of the tubes 3 is 0.13 to 0. 23 mm, a slant angleθof the wall portions 2f of the connection portions 2c is set to satisfy: slant angleθ(°)≥25×(thickness (mm) of sheet plate) + (-125×(thickness (mm) of tube) + 25). COPYRIGHT: (C)2005,JPO&NCIPI
|
