The composition of the U type thermocouple

U type thermocouple typical structure ( The structure of the popularization of) Generally consists of five parts: insulator, sealing material, which leads to the rods, filling material, electric wire, metal protective casing, terminal.

spiral heating wire and bar is located in the middle of the metal protective casing, derivation of its manufacturing process is to spiral heating wire wear into seamless steel pipe, copper or aluminum tube, the gaps through the tube filling machine more evenly fill both insulation and thermal oxidation of medium, such as crystal magnesium oxide powder ( Also can use alumina or clean quartz sand, etc. ) 。 Then with shrinkage pipe diameter shrinkage is fine, make oxide medium dense ( Density to 3. More than 3 g/cm3) So as to ensure the heating wire cut off from the air, the center position not offset and touch and pipe wall. Like this. Calorific value per unit area can increase more than a dozen times. Life can also corresponding increase to more than 10 years. Compared with the same heat electric heating element, tubular thermocouple can save 5% of the electric heating material, and the thermal efficiency can reach above 90%.

as a result, from the perspective of the structure of the U type thermocouple, thermocouple tube shape is widely used at present, simple structure, reliable performance, long service life and sealed electric heating element, can be successfully applied to industry, household electrical appliances, more and more widely used. The structure principle of thermocouple hope that more users to have clear understanding.