Heating – Processes of heating or heater operation – Including melting – vaporizing – sintering – expanding...
Patent
1980-03-12
1981-04-28
Camby, John J.
Heating
Processes of heating or heater operation
Including melting, vaporizing, sintering, expanding...
165105, 432 19, 432 23, 432128, 432152, 432171, F27B 1400, F28D 1500
Patent
active
042642990
ABSTRACT:
A process and apparatus are disclosed for controlling losses in volatile working fluid systems. In accordance with the process, the object upon which a work operation is to be effected is sequentially moved from a first sealable chamber to a second such chamber and back to the first chamber. While in the second chamber the object is exposed to a working fluid vapor which elevates the temperature of the object to a level near the boiling point of the working fluid. Thereafter, while still in the second chamber, a substantial portion of the working fluid is drained from the object such that the sensible heat acquired by the object upon its elevation of temperature is sufficient to evaporate working fluid remaining on the object upon its removal to the first chamber. Upon removal of the object to the first chamber the object is thoroughly dried through control of the partial pressure of the working fluid vapor contained within the first chamber atmosphere. This control is effected by a closed devaporization loop coupled to the first chamber. In addition, any working fluid which may have been deposited on surfaces within the first chamber is revaporized by auxilliary heating means. Virtually all of this working fluid vapor is recovered by extended devaporization of the atmosphere. Throughout the process any pressure differentials which exist between an internal atmosphere within the first and second chambers and an external atmosphere are equalized by means of a snorkellike member.
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NEPCON Proceedings, 1967, pp. 259-264, "Condensation Soldering with Vapor Blanket Reduces Cost of This High Yield", Feb. 24-26, 1976.
Ammann Hans H.
Oien Michael A.
Bell Telephone Laboratories Incorporated
Camby John J.
Fisher John W.
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