| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat exchanger in which blow through or leakage of combustion gas can be suppressed effectively. SOLUTION: The heat exchanger comprises a heat exchanger body 2 where a plurality of channel forming bodies 1 are arranged through a gap to pass air A, a casing 3 surrounding the heat exchanger body 2 in the circumferential direction to pass combustion gas B, and offset type heat transfer fins 11 arranged between respective channel forming bodies 1. A vertical wall 25 extending in the conducting direction of the combustion gas B is provided closely to the casing 3 of each heat transfer fin 11 and tightly to the channel forming bodies 1 in order to suppress leakage of the combustion gas B from the heat transfer fin 11 to the casing 3 side. The gap between the edge parts of the channel forming body 1 close to the casing 3 is filled with a sealing material 23 and then a seal plate 24 is provided on the inner side face of the casing 3 over the entire circumference thereof to touch the heat exchanger body 2 and the sealing material 23 thus closing the air gap between the heat exchanger body 2 and the casing 3.
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