SU573726A1 - Method of making thermocouple hot junction - Google Patents

Description

(54; TECHNICAL METHOD OF THE INVENTION The invention relates to constructions and technologies for the manufacture of thermometric sensors, in particular, methods for producing hot ends of thermocouples. A method is known for producing hot {j junction thermocouples based on a thermocouple cable with mineral insulation in a steel case, including the removal of to a depth exceeding the hot spa zone, cleaning the wires, thermocouples, and welding, followed by backfilling the hot spa with mineral insulation and sealing the steel sheath I. The disadvantage of this method The manufacture of a hot spa is a significant inertiality of the thermocouple. There is a known method of making a hot spa thermocouple, in which a drop of 20 metal melted, for example tin 2, is placed between the junction and the sheath, but this does not eliminate the thermocouple inertia. the interaction of the molten metal with hot junction at high temperatures, which can lead to the destruction of the thermocouple or the cover. There is also known a method of making hot-melted thermocouples based on a thermocouple cable with mineral insulation in a steel cortus, according to which the mineral insulation is removed to a depth exceeding the hot-gas zone, the thermocouple wires and cable jacket are cleaned welding of thermoelectrodes and welding of the steel sheath with simultaneous welding of the sheath with hot; sleep 3j. This method is closest to is &. This provides a low inertia of the thermocouple, however, the mechanical strength of the hot spa is reduced due to the thinning of the thermopair wires in the heat affected zone when the hot spa is welded to the cable sheath. In addition, the mono-coupling of thermocouple wires to the cable body, due to the ef-i ecip crystallization of the cable sheath with thermocouple wires when they are welded, adversely affects the strength of the hot thermocouple thermocouple during operation.