Heating – Processes of heating or heater operation – Controlling flame position or work atmosphere
Patent
1989-07-19
1990-12-04
Yuen, Henry C.
Heating
Processes of heating or heater operation
Controlling flame position or work atmosphere
432 37, 432 72, F27B 904
Patent
active
049750470
ABSTRACT:
A test oven wherein heated air having a predetermined temperature is supplied and the oxygen concentration in the supplied air is controlled. The test oven has a test oven body having an air supply port and an air discharge port, a blower connected to the air supply port for blowing air thereinto, an oxygen concentration detector connected to the test oven body, an oxygen concentration setting control unit connected to the oxygen concentration detecting detector and including an oxygen concentration setter for setting a desired level of oxygen, and an oxygen concentration controller constantly comparing a reference output level generated on the basis of a concentration level set in advance in the oxygen concentration setter with an output level outputted from the oxygen concentration detector and for controling the actual output level to a set level, and at least one oxygen concentration adjusting device. This can be an oxygen and nitrogen supply unit controlled by the oxygen concentration setting control unit for supplying an amount of oxygen and/or nitrogen to an air circulating passage upstream of the blower for regulating the concentration of the oxygen in response to the actual output level of the oxygen concentration setting control, or it can be a blower speed control for controlling the speed of the blower in accordance with such actual output level to blow air from outside into the oven body.
REFERENCES:
patent: 3366374 (1968-01-01), Bay et al.
patent: 3514085 (1970-05-01), Woock
patent: 3824066 (1974-07-01), Muranyi et al.
patent: 4147500 (1979-04-01), Karlsoen
patent: 4490108 (1984-12-01), Petzi
Mitsuhashi Kenhachi
Suga Shigeru
Suga Test Instruments Co. Ltd.
The Yokohama Rubber Co. Ltd.
Yuen Henry C.
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