| 摘要 |
PROBLEM TO BE SOLVED: To laminate plates upon another in a state where the plates are firmly joined to each other and the withstanding pressure of the laminated plates are increased by providing projections having inclined surfaces on the plates, laminating the plates upon another in several ways so that the inclined surfaces of the plates may be joined to each other, and then, using the clearances produced in the projections as a flow passage. SOLUTION: Each plate A is formed to have the cross-sectional shapes shown in cross sections A-A and B-B. Since the cross section shown in cross section A-A has a projection 2 having inclined surfaces 3 and a uniform thickness, the shapes of the external surface 4 and internal surface 5 are similar to each other. In addition, the plate A has openings 6 at four corners. Therefore, a plate type heat exchanger having a high withstanding pressure and a light weight can be obtained without using any gasket, thick steel plate, nor bolt and nut.
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