| 摘要 |
PURPOSE:To prevent the stress corrosion cracking of the titled heat exchanger by a method wherein the height of the outer side wall of a groove of a core plate and the height of calking of the core plate are held in a predetermined relationship so that the stress generating on the surface of the bottom wall of the groove is converted into a stabilized compression stress. CONSTITUTION:A tongue-like guide 26 projecting toward the groove 20 of the core plate is provided on an internal operation surface 11 of a fixing section 10 of the edge of a tank 2. The tongue-like guide 26 projects downwardly from the inner side edge of the inner operation surface 11, that is, the part of the surface 11 adjacent the inner side wall 17 of the groove 20 so as to engage the inner side surface of a sealing member 21 to thereby prevent the displacement of the sealing member. Further, the height (h) of the outer side wall 18 of the groove 20 of the core plate and the height (H) of the calking of the core plate are so determined as to satisfy the relationship of (H-h)>=0.5mm. so that the load applied on the core plate at the time of calking is not transmitted to the bottom wall 19 of the groove 20 and the distortion of the surface of the bottom wall 19 takes place only in the direction of compression of the core plate. |
