High heat microwave oven system with temperature sensor

Electric heating – Microwave heating – With control system

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Details

219712, 219756, 219762, 374149, 373136, H05B 668

Patent

active

053650433

ABSTRACT:
A high speed microwave high temperature oven system mounts an enclosed furnace in its cavity and extends a temperature probe therein. A controller regulates the furnace temperature by periodically interrupting over a range, the operation of the magnetron as the furnace or actual temperature approaches the setpoint. It interrupts the operation of the magnetron for longer periods of time as the actual temperature nears the setpoint. If the actual temperature exceeds the setpoint, the operation of the magnetron is interrupted for even longer periods of time. The controller at a selected furnace temperature also activates an exhaust function to remove hot air, smoke and fumes from and draw clean air into the furnace. As the actual temperature lowers towards the setpoint, the controller shortens the period of magnetron operation interruption. When the furnace temperature cools to a safe temperature, the controller shuts off the exhaust function. The range of periodic operation of the magnetron is automatically adjusted on a large difference between the actual temperature and the setpoint temperature. The range may also be shifted if the stable point temperature differs from the set point. The furnace is a box-like structure having a removable front door, and is formed of ceramic materials. Silicon carbide tiles within the furnace absorb microwave radiation to heat up the furnace.

REFERENCES:
patent: 2888542 (1959-05-01), Mork
patent: 3881027 (1975-04-01), Levinson
patent: 4093841 (1978-06-01), Dills
patent: 4103431 (1978-08-01), Levinson
patent: 4481395 (1984-11-01), Smith et al.
patent: 4506127 (1985-03-01), Satoh
patent: 4626643 (1986-12-01), Minet
patent: 4751357 (1988-06-01), Boulard
patent: 4822966 (1989-04-01), Matsubara
patent: 4835354 (1989-05-01), Collins et al.

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