Electric heating – Metal heating – Of cylinders
Patent
1991-11-14
1993-04-06
Reynolds, Bruce A.
Electric heating
Metal heating
Of cylinders
219 1055B, 219 1055F, 219 1055R, 219 1055M, H05B 670
Patent
active
052005887
ABSTRACT:
A microwave heating apparatus includes a microwave oscillator, a waveguide for transmitting microwave energy outputted from the microwave oscillator to an object to be heated, detectors for detecting the power of the microwave energy inputted from the microwave oscillator to the object to be heated and the reflected power of the microwave energy reflected from the object to be heated, a matching stub provided in the waveguide, and a driver for driving the matching stub. The driver calculates a VSWR value from the inputted power and the reflected power and includes a motor for driving the matching stub so that the VSWR value is maintained within a predetermined range. Matching of the waveguide impedance with the load impedance can be executed automatically and the VSWR value can be maintained in the range of good matching. Thus, lowering of heating efficiency can be prevented.
REFERENCES:
patent: 3474212 (1969-10-01), White
patent: 4711983 (1987-12-01), Gerling
patent: 4771153 (1988-09-01), Fukushima
patent: 4964415 (1990-10-01), Larsen
patent: 5008506 (1991-04-01), Asmussen et al.
patent: 5069928 (1991-12-01), Echizen et al.
Kato Yoshiyuki
Kondoh Isao
Doryokuro Kakunenryo Kaihatsu Jigyodan
Reynolds Bruce A.
To Tuan Vinh
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