| 摘要 |
1,049,752. Making heat exchangers; soldering. S.A. DES USINES CHAUSSON. June 21, 1963 [July 9, 1962], No. 24814/63. Headings B3A and B3R. A method of making a heat exchanger comprises assembling tinned fins to tinned tubes, fitting a lower collector having flanged apertures over the ends of the tubes, expanding the tubes therein, pickling the assembly in a flux bath, tilting the assembly to remove excess flux therefrom by gravity or an air jet applied thereto, differentially heating the vertically disposed assembly by passing it through successive preheating and soldering chambers which extend to half the height of the assembly to effect soldering of the lower half thereof, air cooling the assembly, turning it through 180 degrees, attaching the upper collector to the tubes and differentially applying heat to the upper half thereof to effect soldering as before followed by accelerated cooling. The collector may be coated with soldering material by steeping in a bath or by an atomized spray. Alternatively, a thin perforated sheet of material may be inserted between the tubes and collector flanges on assembly. Hot air jets and one or more jet burners may be housed in the chambers to effect heating of the fin and tube portions and the collector respectively to effect soldering thereof. A blower unit may be positioned at the exit of each chamber to remove excess solder. The operations are preferably conveyerized with the process line having an in-line, looped or L1-shaped layout. |
