| 摘要 |
<p>1,089,529. Automatic temperature control. PYROTEL CORPORATION. July 26, 1966 [July 27, 1965], No. 33594/66. Heading G3R. A system for automatically controlling the temperature of a heated process roll such as may be used in the manufacture of synthetic fibres and the like comprises a rotatable, hollow roll 1 heated by an internally disposed infrared heater 2, an infrared detecting element 6 being positioned to provide a signal representing the temperature at the outer surface of the roll, the signal being fed to an amplifier-controller 5 so as to control the heating effect of the infrared heater 2 to maintain the temperature of the roll surface constant. To enhance the operation of the system the internal surface 3 of the roll is coated with an infrared absorbent material and the outer surface 4 is treated so that it approximates to a black body radiator. If desired this latter treatment may be confined to a band 11 which co-operates with the detecting element 6. Impellers 7 may be provided to control the movement of air through the roll and the amplifier-controller 5 may effect control in an ON-OFF or proportional manner. The detecting element 6 may comprise a thermistor, a bolometer, a photo-conductive or a photo-voltaic element.</p> |
