Protection device and method for a platinum channel welded thermocouple

Abstract

The invention discloses a protective device and method for a platinum channel welded thermocouple, which comprises an upper protective plate, a lower protective plate and a protective cover; the upper protective plate is closely attached to the lower protective plate, and the upper protective plate is provided with a first groove and a protective cover. The second groove; the lower protective plate is provided with a lower plate groove, and the bottom of the lower plate groove is provided with a first through hole and a second through hole; The through hole corresponding to the first groove and the second groove, the bottom of the protective cover is connected with the platinum channel. Pull out the two thermocouple wires separately, and the wires are completely separated from the roots to ensure the insulation and airtight environment of the thermocouple wires at high temperatures, inhibit the oxidation of the wire materials, and prevent the adhesion of the thermocouple wire roots in a hot state , improve the accuracy of thermocouple temperature detection, prolong the service life of welded thermocouples, and provide guarantee for the normal production process; simple structure, low manufacturing cost, strong applicability, and convenient for large-scale use.

Description

technical field [0001] The invention belongs to the field of platinum channel temperature monitoring, and relates to a protection device and method for a platinum channel welded thermocouple. Background technique [0002] The production of flat-panel liquid crystal display substrate glass is a high-temperature process. The kiln must first melt the raw materials at a temperature above 1580°C, and then process the molten glass through various processes set by the platinum channel. , including clarification and defoaming, stirring and homogenization, cooling adjustment, etc., and finally provide high-quality glass that meets the process conditions for molding. During the whole process, the platinum channel area is very important for the precise treatment of the quality of molten glass. We monitor the actual process temperature by setting platinum-rhodium thermocouples installed in multiple positions in each section of the platinum channel. Adjust the heating power of each sect...

AI Technical Summary

Problems solved by technology

Under the action of high temperature for a long time, Pt and Rh will continue to oxidize and volatilize, so that the wire diameter of the galvanic wire will gradually decrease, and a large amount of volatilized Pt and Rh will be precipitated and condensed on the surface of the galvanic wire after reaching saturation. Especially at the root, there will be adhesion phenomenon in the thermal state, which will cause the temperature measurement point to move outward, resulting in the attenuation of temperature

Although the two thermocouple wires currently used for detection are respectively covered with alumina protective ceramic beads, which can inhibit the volatilization of Pt and Rh to a certain extent, but the real prolongation and protection of the service life of the thermocouple It has not been fundamentally solved, mainly due to the above reasons and the limitations of the root welding method during the use of the thermocouple, which will lead to the breakage or failure of the wire, which will directly lead to the damage of the thermocouple. Normal detection can no longer continue, which is very troublesome for process monitoring

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