| 摘要 |
PROBLEM TO BE SOLVED: To eliminate the need of a joining process such as brazing of a heat exchanger composed of a core pipe and an outer pipe, and to reduce a manufacturing cost by simplifying manufacturing facilities and a manufacturing process. SOLUTION: The heat exchanger comprises the core pipe 1 forming a water passage 2; and a plurality of outer pipes 3 extending in parallel with an outer periphery of the core pipe1, and forming a coolant passage 4 having a passage cross-sectional area smaller than that of the water passage 2. The core pipe 1 and the outer pipes 3 are structured to be united, fixed and integrated so as to be press-contacted with each other by a predetermined mechanical uniting/fixing member. COPYRIGHT: (C)2004,JPO |
