| 摘要 |
PURPOSE:To obtain secure and rigid soldering by placing and melting, while contacting the clearance-keeping projections provided on the upper plate of a heat- exchangers with the small hole parts of the lower plates, solder between fins and the plates. CONSTITUTION:Small holes are provided, in a lower plate 2, at the intervals of the times of an integral number of the corrugation pitches of fins 11 at a place where the contact thereof is made with the clearance-keeping projections 8 provided on an upper plate 1 and the covering thereof is made with the flat part at the underside of the recesses of the fins 11. The holes 9 are made smaller in diameter than the top part 10 of the projections 8. Next, soldering is made in a furnace with foil-shaped solder 21 and 22 placed between the inner walls of the fins 11 and the plates 1 and 2 and the projections 8 contacted with the lower plate 2. Thereby, melted solder 21 and 22 flows into the holes 9 without fail through the capillary action between the flat part 12 of the fins 11 and the plate 2 so that the projections 8 and plate 2 are soldered securely and rigidly. |
