| 摘要 |
PROBLEM TO BE SOLVED: To enhance pressure-resistant strength by arranging cover plates of identical dimensions having a planar part and a rising fringe part on the circumference thereof between one frame and a heat transfer plate at one end and on the outside of the other frame and then brazing each cover plate to adjacent heat transfer plate and frame. SOLUTION: At the time of manufacturing a brazing plate type heat exchanger 1 constructed to sandwich a cover plate 8 between an upper frame 3 and a heat transfer plate 5, a rising fringe part 8b is formed on the outer circumference at the planar part 8a of one cover plate 8 sandwiched between the upper frame and the heat transfer plate 5 and a nozzle through hole 8c is made in the planar part 8a. A rising fringe part 9b is formed on the outer circumference at the planar part 9a of the other cover plate 9 being jointed to the lower frame 4. After the heat transfer plate 5, the lower frame 4 and the other cover plate 9 are abutted tightly, they are brazed at the abutting parts thus enhancing brazing strength of the upper and lower frames 3, 4 with respect to the heat transfer plate 5 and attaining high pressure-resistant strength.
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