| 摘要 |
Ends of heat transfer plates (S1, S2), is formed by bending foldable materia ls in a zigzag shape along bend lines (L1, L2), are cut in an inverted V-shape, and flange sections (26) formed by bending vertex parts of the inverted V- shape portions are superposed one over another and brazed in a planar contac t state, thereby to form combustion gas passage inlets (11) and air passage outlets (16) along the two sides of the V-shape portions. Compared with brazing of separate flange members onto the cut faces of the vertex parts of the V-shape portions, this fabrication not only dispenses with precise finishing of the cut faces, but also serves to increase the brazing strength .
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