Heating – Work chamber having heating means – Having means by which work is progressed or moved mechanically
Patent
1994-12-09
1997-11-04
Bennett, Henry A.
Heating
Work chamber having heating means
Having means by which work is progressed or moved mechanically
432 72, 432199, 432152, F27B 902
Patent
active
056832427
ABSTRACT:
An oven for electronics manufacturing including a heated chamber having openings at each end to the ambient environment wherein heated air is circulated by a centrally located fan to pass over workpieces in a substantially upward (or downward) flow. Equal temperatures at the entrance and exit ends of the heated chamber are promoted by a crossover air return arrangement in which a portion of the air from each end of the heated chamber is mixed with the air from the other end of the chamber as the circulating air is drawn into the fan for recirculation. In addition, a moveable shutter mechanism is provided at the entrance end and exit end of the heated chamber to adjust the air flow at the ends of the heated chamber. The shutter mechanism operates to selectively close off an adjustable portion of the heated air flow at the ends of the heated chamber. A closed loop control system maintains equal temperatures and air flow at the opposite ends of the heated chamber by periodically adjusting the shutter mechanism position in response to the measured temperatures of the air immediately outside the entrance and exit ends of the heated chamber.
REFERENCES:
patent: 4308853 (1982-01-01), Thirode
patent: 5233763 (1993-08-01), Minnie, Jr.
Cronin John V.
Koistinen David M.
Rose Peter R.
Stroud Mark A.
Bennett Henry A.
Circuit Automation, Inc.
Weber Jr. G. Donald
Wilson Gregory
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