| 摘要 |
PURPOSE: To reduce the size of a heat exchanger without sacrifice of heat exchanging characteristics by connecting plates by means of two joining pieces through a stack of a plurality of plates welded between them. CONSTITUTION: First and second stacks are formed by arranging respective plates 20 while intersecting the slots 21 thereof. Similarly, a third stack is formed of plates 20' and arranged between the first and second stacks. An envelope 2 thus formed is arranged between a pair of cover members 1 and the flange members 30 of joint pieces 3 are engaged through a molten pallet being welded into notches 10, 22, 22'. Finally, it is heated in vacuum and welded. Consequently, the plates 20, 20' and the cover member 1 are secured at the circumferential fringe parts thereof. Heat exchanging fluid being supplied through one connecting piece 3 is circulated through the slots 21', 21 and discharged from other connecting piece 3 thus increasing the heat exchanging surface. |
