| 摘要 |
A heat exchanger for cooling high-temperature gas includes a gas tank portion into which the high-temperature gas is supplied through an inlet port of the gas tank portion, a plurality of tubes configured such that the high-temperature gas flowing from the gas tank portion passes therethrough, and a cooling-medium tank portion covering each of the tubes with a gap defined therebetween. Each of the tubes has an expansion portion located at a side of the inlet port. A cooling medium flows in the gap on an outer peripheral surface of the tube. The gas tank portion, the cooling-medium tank portion, and the expansion portion of the tube are stacked such that a partition portion between the gas tank portion and the cooling-medium tank portion has a thickness larger than a thickness of the gas tank portion or the cooling-medium tank portion.
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