Heating – Work feeding – agitating – discharging or conveying... – Having closure or seal for work feeder's entrance passage
Patent
1993-08-26
1994-03-01
Yuen, Henry C.
Heating
Work feeding, agitating, discharging or conveying...
Having closure or seal for work feeder's entrance passage
432251, 432205, 432 176, F27D 118
Patent
active
052901890
ABSTRACT:
Modifications are provided to a standard, batch type industrial heat treat furnace of a hot wall design which permit the furnace to be operated efficiently at high temperatures. The furnace is of a cylindrical design having a forward heat treat chamber and a rearward plenum chamber with a flat bulkhead plate in-between the chambers. The bulkhead has exit and inlet openings permitting wind mass to flow to the heat treat chamber and back to the plenum chamber. The bulkhead has a plurality of radially extending slits formed therein which permit the bulkhead to remain flat despite temperature and pressure gradients resulting in expansion/contraction of the bulkhead. Additionally, the furnace includes a closed end muffle within the heat treat chamber into which work to be heat treated is placed. A water cooled spring biasing support is provided for the closed end of the muffle to resist downward deformation of the muffle at high temperatures. The furnace additionally includes a heat shield circumscribing the furnace casing to provide a cooling air space for preheating burner combustion air while minimizing heat losses and the cost of furnace insulation.
REFERENCES:
patent: 4512738 (1985-04-01), Hartmann
patent: 4569508 (1986-02-01), de Graaf
patent: 4787844 (1988-11-01), Hemsath
patent: 4789333 (1988-12-01), Hemsath
patent: 4830610 (1989-05-01), Hemsath
patent: 4840559 (1989-06-01), Hemsath
patent: 4854860 (1989-08-01), Hemsath
patent: 4854863 (1989-08-01), Hemsath
patent: 4891008 (1990-01-01), Hemsath
patent: 5119395 (1992-06-01), Hemsath et al.
Hemsath Klaus H.
Lyon James E.
Gas Research Institute
Nawalanic Frank J.
Yuen Henry C.
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