| 摘要 |
A heat exchanger includes a pair of tanks spaced from each other and a plurality of parallel heat transfer tubes fluidly connected between the pair of tanks. Each tube has end portions inserted into holes disposed in the tanks. The end portions of each tube have a maximum diameter which is smaller than a central diameter of a central portion of the tube. At least one of the end portions comprises a straight portion having the maximum diameter and a tapered portion extending from the straight portion with a tapering diameter gradually decreasing from the maximum diameter. Manufacturing this heat exchanger is easier because the tubes are easily inserted into the holes of the tanks. Further, effective brazing between the tubes and the tanks may be achieved by the structure of the tube end portions having the straight portions and the tapered portions even if the length of the tubes vary slightly due to warping or improper manufacture.
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