| 摘要 |
1,183,509. Thermocouples. ENGLISH ELECTRIC CO. Ltd. 29 Nov., 1968 [30 Nov., 1967], No. 54659/67. Heading H1K. A succession of thermocouples are made by forming a series of spaced welded junctions 5-9 between two dissimilar metal wires 1, 2, passing the wires through at least one molten glass bead so as to coat them with molten glass, allowing the glass to solidify and cutting the wires adjacent each junction. As shown wires 1, 2 of 90% Ni/10% Cr and 98% Ni/2% Al respectively, preferably loosely twisted together, are welded together at junctions 5-9 by electrodes 3, 4 and are then directed by means of a guide 10 to a pair of heating loops 11, 12. The first loop 11 is continuously supplied with molten glass from a rod 17, thereby coating the wires 1, 2. The second loop 12, which may be omitted, may likewise be fed continuously from a rod 18, or may be initially supplied from the rod 18 and subsequently replenished by molten glass carried by the wires 1, 2 from the first loop 11. The loops may be open as shown, or closed or may be replaced by heating electrodes. The coated wires 1, 2 are drawn upwards, e.g. by resilient rollers 22. If a devitrifiable glass is used for coating the wires a furnace (not shown) may be provided to devitrify the coating by heating prior to solidification. Finally a shearing device cuts off each separate coated thermocouple 25. The tip of the thermocouple may be dipped into molten glass after cutting to recoat the junction. |
