| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat exchanger minimizing production costs related to an increase of man-hours and enlargement of a production facility, and also minimizing an increase of flow resistance of a fluid in an annular passage, while securing the cross-sectional area of the annular passage which is easily deformed and crushed in the double tube type heat exchanger. SOLUTION: The annular passage 3 of a bent tube part 1b of a triple tube 1 of the heat exchanger 1X is provided with cylindrical members 5. The stable cross-sectional area of the annular passage 3 is thereby secured at the bent pipe part 1b where the annular passage 3 is easily crushed and deformed. Since there is no need to provide a cylindrical member 5 in the annular passage 3 in a straight pipe part 1a comparatively hard to crush and deform, flow resistance is reduced while minimizing vertical height in the circumferential direction of the annular passage 3, and the desired amount of heat exchange is obtained. The outer diameter of an outer tube 4 is also reduced, and there is no need to dispose the cylindrical members 5 in the whole annular passage 3. The increase of man-hours and the enlargement of the production facility are thereby minimized, and the increase of a material cost and a machining cost of a triple tube 1 is reduced. COPYRIGHT: (C)2007,JPO&INPIT
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