| 摘要 |
PROBLEM TO BE SOLVED: To provide a practical multitubular heat exchanger in which an outer tube and heat transfer tubes are hardly broken even when they receive impact shock such as vibration for a long period. SOLUTION: Heat transfer tubes 2, the outer tube 3, an introduction pipe 6 and a discharge pipe 7 are assembled to form this multitubular heat exchanger 1. A plurality of projections (projections 21, and projections 26) are provided dispersedly on an outer surface of each of the heat transfer tubes 2, in predetermined positions, and a plurality of projections (projections 10, and projections 14) are provided dispersedly on an inner surface of the outer tube 3 in positions corresponding to the predetermined positions. The projections (projections 10, or projections 14) of the outer tube 3, and the projections (projections 21, or projections 26) of the heat transfer tubes 2, are not joined to each other, and the projections (projections 21, and projections 26) of the adjacent heat transfer tubes 2 are not joined to each other. COPYRIGHT: (C)2011,JPO&INPIT
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