Split bushing control

Details Split bushing control Split bushing control

1975-11-28

1977-05-17

Envall, Jr., R. N.

Electric heating

Microwave heating

Tunnel furnace

65162, 219494, C03B 502

Patent

active

040243362

ABSTRACT:
A circuit is described for controlling the temperature of a heating element used to heat molten glass in a bushing from which the molten glass is drawn into glass fibers and in which the bushing is divided into two sections. The circuit includes two temperature sensitive elements, such as thermocouples, each of which is connected to a temperature controller. In one embodiment of the invention, the first temperature controller regulates the power supplied by the transformer while the second temperature controller regulates the current to the heating element through a pair of full wave variable impedance devices. In the second embodiment, the transformer maintains a steady level of voltage supply while each temperature controller individually regulates one of two full wave variable impedance devices to regulate the current supplied to each section of the heating element.

REFERENCES:
patent: 3556753 (1971-01-01), Glaser
patent: 3912477 (1975-10-01), Brady et al.

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