| 摘要 |
In a heat exchanger which is constructed such that heat-transfer plates S1, S2 in the form of a quadrilateral are bent at fold lines in a zigzag fashion to form combustion gas passages 4 and air passages 5 alternately in a circumferential direction, arrangement is made to enhance material yield and to facilitate brazing of components for formation of a fluid duct. Thus radially outer peripheral walls 6, 8o, 10o and radially inner peripheral walls 7, 8i, 10i, respectively, are brazed to fold lines at outer peripheries and inner peripheries of the heat-transfer 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 continuous to an air passage outlet 16.
|
