| 摘要 |
1312289 Thermocouples VEREINIGTE OSTERREICHISCHE EISEN-UND STAHLWERKE AG 12 Oct 1970 [16 Oct 1969] 48418/70 Addition to 1250975 Heading H1K The thermocouple arrangement of the main patent, in which a replaceable unit comprising a capillary tube containing the thermocouple secured to an insulating sleeve carrying a coaxial socket is positioned within a metal or metal-ceramic sheath, is modified by enclosing the capillary tube in a gas tight tube which is also secured to the insulating sleeve, the thermo junction being spaced from the closed end of the gas tight tube. As shown, thermocouple wires 15, 16 extend through a capillary tube 11 at the lower end of which they are joined to form the hot junction 12. The capillary tube is surrounded by a gas tight tube 10, the upper end of which is secured to an insulating sleeve 21 carrying a coaxial socket 17 to which the ends of the thermocouple wires are connected. The capillary tube is also secured to the sleeve 21 by means of a filling 22 of casting resin or gum. Alternatively the coaxial socket and the upper ends of the capillary and gas tight tubes may be inserted in a mould and secured together by casting resin which also forms the sleeve 21. The above assembly constitutes a replaceable unit which is placed inside a sheath 6 comprising a metalceramic end portion 7 and a steel upper portion 8 which is secured to the end of a water cooled lance 1 by means of a nut 9. A spring 24 is provided to ensure that the end 13 of the gas tight tube 10 is in good thermal contact with the end 27 of the sheath 6. A coaxial plug 18 connected to compensating leads 19 is inserted into the socket 17 and a refractory jacket 5 is releasably secured to the assembly. The gas tight tube may be filled with a protective gas. The device may be utilized for continuous measurement of the temperature of a molten metal. |
