| 摘要 |
In the case where a partition for partitioning a combustion gas passage inlet (11) from an air passage outlet (16) is defined by a plate (8) attached by brazing to end faces of a plurality of heat exchanger plates (S1, S2) in a heat exchanger (2), durability of the brazed portions are prevented from being degraded due to a load F acting on the plate (8) by a pressure differential between a combustion gas and air. Thus a joint substrate (26) is attached by brazing to the end faces of the heat exchanger plates (S1, S2) with the front surface of the joint substrate (26) brazed to the rear surface of a joint flange (28), which is formed by bending an end of the plate (8) by right angles, and a joint flange (27) having an L-shaped cross section is attached by brazing to an underside of the plate (8) and the front surface of the joint substrate (26). Accordingly, the joint portions are increased in rigidity to ease stress concentration, thus enhancing durability.
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