| 摘要 |
PROBLEM TO BE SOLVED: To provide a structure that can promote a fluid flow through a simple and inexpensive structure by preventing flow stagnation in an outer passage formed between an outer tube and an inner tube. SOLUTION: The double-pipe heat exchanger 1 comprises a cylindrical shell 2, and a heat exchanger tube 3 arranged coaxially in the shell 2 and provided with circumferentially alternate longitudinal projections 11 and recesses 12. In the heat exchanger 1, the shell 2 has near a front end a cooling medium inlet pipe 9 for leading cooling medium to an outer passage formed between the shell 2, and has near a rear end a cooling water outlet pipe 10 for discharging the cooling water. A partitioning member 13 having an enclosure part 14 enclosing the tube 3 in contact with each projection 11 to divide the outer passage along the diameter, and partitioning parts 15 and 16 contacting with the inside surface of the shell 2 and each projection 11 to longitudinally divide the outer passage outside the projections 11 is provided longitudinally between the inlet pipe 6 and the discharge pipe 7. COPYRIGHT: (C)2007,JPO&INPIT
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