The electric heating tube is a tubular electric heating element composed of a metal tube, a spiral resistance wire, and crystalline magnesium oxide powder with good thermal conductivity and good insulation. The high temperature resistance wire is evenly distributed in the high temperature resistant stainless steel seamless tube, and the gap is densely formed. Fill in the crystalline magnesium oxide powder with good thermal conductivity and insulation performance. This structure is not only advanced, high thermal efficiency, but also generates uniform heat. When a current passes through the high-temperature resistance wire, the heat generated passes through the crystalline magnesium oxide powder to the surface of the metal tube Diffusion, and then transferred to the heated part or the air to achieve the purpose of heating. In the production process, the properties of the resistance wire, the fineness of the crystalline magnesium oxide powder, and the level of process technology directly determine the power of the electric heating tube. For a qualified product, the power and error of the electric heating tube are allowed:
According to "JB/T 2379-93 Industrial Electric Heating Tube Standard", the deviation range of rated power is as follows:
Under the condition of sufficient heating and heating, the deviation of the rated power of the electric heating tube should not exceed the range specified below:
1. For electric heating tubes whose rated power is less than or equal to 100W: ±10%;
2. For electric heating tubes with electric heating tube rated power greater than 100W: +5%~-10% or 10W, whichever is greater.
