Introduction to the structure of the electric heating tube
The typical structure of the metal tubular electric heating tube (the common structure) is generally composed of 5 parts: insulator, sealing material, lead rod, filler, electric heating wire, metal jacket tube, and terminal.
The spiral heating wire and the lead-out help are located in the center of the metal sheath. Its manufacturing process is to penetrate the spiral heating wire into seamless steel pipes, copper pipes or aluminum pipes. The gaps are evenly filled by a multi-tube filling machine. Thermally conductive oxidizing medium, such as crystalline magnesia powder (alumina or clean quartz sand, etc. can also be used). Then use a tube shrinking machine to reduce the diameter of the tube to make the oxide medium compact (density above 3.3g/cm3), to ensure that the heating wire is isolated from the air, and the center position does not shift and touch the tube wall. so. The calorific value per unit area can be increased more than ten times. The service life can be correspondingly increased to more than 10 years. Compared with the electric heating element with the same large heat, the tubular electric heating tube can save 5% of the electric heating material, and the thermal efficiency can reach more than 90%.
Therefore, from the perspective of the structure of the electric heating tube, the metal tubular electric heating tube is currently the most widely used sealed electric heating element with simple structure, reliable performance and long service life. It can be successfully applied to industry and household appliances, and it is used more and more. Extensive. Hope that more users have a clear understanding of the structure principle of the electric heating tube.