Heating – Work feeding – agitating – discharging or conveying... – Having closure or seal for work feeder's entrance passage
Patent
1996-04-16
1998-01-20
Bennett, Henry A.
Heating
Work feeding, agitating, discharging or conveying...
Having closure or seal for work feeder's entrance passage
432 77, 432115, 432233, 432205, 415110, 415111, F27D 118
Patent
active
057095442
ABSTRACT:
A vacuum heat treating furnace includes a pressure vessel having a wall that defines a chamber wherein metal parts are vacuum heat treated. A fan is disposed inside the chamber for circulating a cooling gas therein. An electric motor is mounted externally to the pressure vessel for driving the fan. A drive shaft interconnects the fan and the electric motor through an opening in the wall of the pressure vessel. The vacuum furnace incorporates a dual seal for providing a vacuum-tight seal and a gas-tight seal where the drive shafts passes through the pressure vessel wall. The dual seal includes an inflatable seal surrounding the drive shaft for providing a vacuum-tight seal around said drive shaft when the furnace chamber is evacuated to a subatmospheric pressure. The dual seal also includes one or more lip seals surrounding the drive shaft adjacent to said inflatable seal for providing a gas-tight seal around said drive shaft when the furnace chamber is backfilled with a superatmospheric pressure of the cooling gas and while the drive shaft is rotating.
REFERENCES:
patent: 3843140 (1974-10-01), Mayer et al.
patent: 4451200 (1984-05-01), Libertini et al.
patent: 4818222 (1989-04-01), Docherty et al.
patent: 4846675 (1989-07-01), Soliman
patent: 4906182 (1990-03-01), Moller
patent: 5173045 (1992-12-01), Macri
Abar Ipsen Industries, Inc.
Bennett Henry A.
Lu Jiping
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