| 摘要 |
PURPOSE:To improve heat exchanging efficiency and contrive the reduction of size and weight of a heat exchanger by a method wherein the plates of specified structure are laminated while deviating them by 180 deg. to form a first flow passage and a second flow passage alternately. CONSTITUTION:A circular plate 52 is provided with rise-up flanges 4a, 4b at the peripheral rims of a bottom wall 5 and a central port respectively while openings 55a, 55b, 56a, 56b are provided on two straight lines X1,Y1-X2, Y2 intersecting on the bottom wall with an acute angle at the positions of equal distances from the center of the circular plate respectively. The openings 55a, 56a in the acute angle X1ZX2 are provided with peripheral rim flanges 60 respectively. The plates 52 are superposed while deviating them by 180 deg. and the connecting parts of respective flanges are brazed to form a first flow passage, consisting of an inflow passage 10 and an out-flow passage 11, and a second flow passage, consisting of the inflow pass age 12 and the outflow passage 13, between respective plates alternately. Upper and lower end plates 9, 15 are secured to the upper and lower end surfaces of the plates while a first inflow port 15b, a first outflow port 9a, a second inflow port 15c and a second outflow port 15d are bored on either one of the end plates to communicate them to the first or second flow passage. |
