| 摘要 |
A tube of a heat exchanger is provided to lighten the tube but improve durability by effectively arranging and jointing plural beads made of a light and thin material as the tube in a short width. A tube of a heat exchanger comprises plural beads(B) arranged in predetermined rows on the inner surface. A width(t) of the material is 0.15~0.35 millimeters. A width(W) of the heat exchanger tube is 5~30 millimeters. Joint interval(P) between adjacent beads is 1~9 millimeters. A supporting distance(L) between beads(B1) correspondingly jointed with each other and one-side lateral side(S) of the inner surface of the heat exchanger tube is under 9 millimeters. The joint beads about the whole beads are in a ratio over 20 percent.
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