| 摘要 |
In a heat exchanger having a coaxial pipe, the coaxial pipe is formed by integrating an inner pipe, an outer pipe and connecting walls together by an extruding or a drawing forming process. A header of a first connecting member is connected to a removed portion formed by removing a part of the outer pipe at an end portion of the coaxial pipe. A second connecting member is welded to the inner pipe at a more longitudinal end side of the inner pipe than the header. Thus, the coaxial pipe can be bent like a coil for downsizing the heat exchanger without reducing the heat-exchanging ability of the heat exchanger, and the total cost of manufacturing the heat exchanger can be reduced.
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