| 摘要 |
<p>A double pipe heat exchanger that can be produced easily and can be used as a part of piping by bending the whole body, wherein an inner pipe 1 is configured so that: a plurality of balloon-shaped bulges 3 communicating with one another and extending from the center toward the radial directions in a cross section orthogonal to the axis line thereof may be formed; the outer circumference of the bulges 3 may be bent into the shape of waves in an axial cross section; and the top portions 9 of the waves may touch the inner surface of an outer pipe 2. Then in the state, the whole body including the inner pipe 1 and the outer pipe 2 is bent by applying external force.</p> |
