| 摘要 |
<p>337,803. Pilkington Bros., Ltd., and Hogg, P. M. Aug. 2, 1929. Regulation, automatic.-The temperature of a body which is heated in an electric or other furnace is regulated by passing a current, which may be the heating current, through the body, and utilizing the variations in conductivity due to temperature variations, to control the heating means. In the application to a glass kiln 1 heated by the passage of current between electrodes 2, 3 connected through a resistance 15 to supply mains 4, 5, a solenoid 12 is connected across the electrodes 2, 3 through a variable resistance 14, and a solenoid 13 is connected across the resistance 15 through variable resistance 16. A predetermined fraction of the voltage and of the current can thus be utilized in the solenoids 12, 13 respectively, and at a predetermined average temperature of the glass the beam 7 will remain balanced. Any variation in the conductivity of the glass will result in the beam .7 becoming unbalanced, and contact will be made at 18 or 19, relay 20 or 21 will be energized, and a voltage regulator operated to rectify the voltage across the electrodes in the kiln. If the heating is not electrical, current is passed through the charge merely to measure the average conductivity and operate the regulating device.</p> |
