| 摘要 |
A dual pipe type heat exchanger and a manufacturing method thereof are provided to prevent the damage of a helical fin protruded from an inner tube while inserting the inner tube. A dual pipe type heat exchanger comprises an outer tube(210), and an inner tube(260) inserted within the outer tube. The outer tube has a space of a first fluid, a space(212) of a second fluid, and a first inlet(220) for the first fluid and a first outlet(230) formed at both end parts. The inner tube has a plurality of helical fin(262) formed along the outer wall perimeter of a cylindrical pipe, and a second inlet(240) and a second outlet(250) formed at both end parts for the second fluid. |
