The impact of electric heating tubes without port sealing

The impact of electric heating tubes without port sealing

After understanding the structure of electric heating tubes, the characteristics of electric heating tubes, the role of fillers in electric heating tubes, and the quartz sand and magnesium oxide fillers in electric heating tubes, let's take a look at how electric heating tubes seal their ports?

In the structure of an electric heating tube, the spiral electric heating wire is filled with a dense powder like filling material between the metal tube shell. The filling material has good thermal conductivity and insulation performance in dry and dense conditions. But they all have varying degrees of hygroscopicity. When the filling material at both ends of the heating tube is exposed to moisture, its electrical insulation performance greatly decreases. When the end of the heating tube is not sealed, the moisture absorption of the filler has a significant impact on the insulation performance of the electric heating tube.

On the other hand, when magnesium oxide becomes damp and hygroscopic, a portion of it (especially those with poor or imperfect crystallization) will undergo hydration. The hydrated magnesium oxide will cause its molecular size to thicken and clump. For electric heating tubes, the nozzle absorbs the most moisture, so clumping is also more severe. Once the nozzle clumps, the moisture absorbed by the filling material deeper from the nozzle becomes more difficult to discharge, resulting in the inability of the electric heating tube to recover insulation even when it is powered on and generates heat on its own. Even the moisture in the heating tube vaporizes and expands due to heating, causing the wall of the heating tube to bulge and burst.

When wet, insulation decreases, and after hydration, molecular particle size increases, which affects the recovery of insulation resistance of the heating tube. In terms of these two points, the electric heating tube needs to be sealed at the end.

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