| 摘要 |
A heat exchanger which is constructed such that heat exchanger plates (S1, S2) in the form of a quadrilateral are bent at fold lines in a zigzag manner to form combustion gas passages (4) and air passages (5) alternately in a circumferential direction so as to enhance material yield and to facilitate brazing of components for formation of a fluid duct. Thus radially outward peripheral walls (6, 8o, 10o) and radially inward peripheral walls (7, 8i, 10i), respectively, are brazed to fold lines at outer peripheries and inner peripheries of the heat exchanger plates (S1, S2) to form a duct (13) continuous to a combustion gas inlet (11), a duct (14) continuous to a combustion gas outlet (12), a duct (17) continuous to an air passage inlet (15), and a duct (18) continous to an air passage outlet (16).
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