The structure of single head thermocouple

Single head of thermocouple is also called single thermocouple, cartridge thermocouple ( 筒加热器) , it is the thermocouple ( Tubular electric heating element) A kind of electric industry in China, there is a long term models: M3. In the late 90 s because of the thermocouple is widely used in China, the shape of the thermocouple is also now a lot of, in southern China will have the qualification of mold in the thermocouple as the single head thermocouple or single-ended thermocouple, very image.

in a foreign country is called the cartridge heater, also is a kind of image and because cartridge shell is cylindrical, one end is closed, with China's call for the single head thermocouple is qiao took his fellow workers said.

single head thermocouple typical structure ( The structure of the popularization of *) Thermocouple is the same, and 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 lead to help is located in the middle of the metal protective casing, its manufacturing technology is to spiral heating wire wear in the 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%.