What does the sieving effect of the heating tube refer to? It is mainly reflected in which part of the heating tube production, and what effect does it play on the entire production of the heating tube. From the perspective of the production of the entire heating tube, the sieving of the heating tube is an important step in the heating tube manufacturing process, which is mainly reflected in the filling of the tubular insulating magnesium oxide powder for the electric heating tube. During the filling process, there is one The effect is called the "sieving" effect, and the sieving is related to the quality and service life of the heating tube. Let’s introduce to customers that the sieve effect of the heating tube has a deeper understanding of the production of the heating tube.
It means that when the spiral resistance wire is installed in the center of the tube, during the powder filling process, we expect that the powder that is poured is in the spiral of the spiral wire or outside the spiral, and the uniformity of the powder mesh is required, that is, the powder is added. The density is the same. Then after shrinking, the shrinkage density of the magnesium oxide powder inside and outside the spiral resistance wire is the same, which is necessary to consider when designing the tubular electric heating element. But the vast majority of designers have neglected this extremely important question. Because the designer blindly seeks a lower wire load, the resultant wire is thicker, and the interval between adjacent spiral loops is very small, and then the magnesium oxide particles with a larger particle size cannot enter the spiral of the spiral resistance wire. In the spiral ring, only a part of the finer particles of powder enters the spiral ring, and then the appearance of "emptying" occurs.
Because of the dense spiral resistance wire, the space between adjacent spiral loops cannot allow larger particles of magnesium oxide to flow into the spiral loop, so the spiral loop is like a sieve, and the interval between adjacent spiral loops is equivalent to the sieve holes in the sieve , And the diameter of the sieve hole is close to or even smaller than the equivalent diameter of the magnesium oxide powder mesh size particles, so that the large particles of magnesium oxide particles are blocked by the smaller aperture sieve, so it is said that the spiral resistance wire has a "sieving" effect on the magnesium oxide powder. .
Because of the existence of the "sieve" effect, when the fabricated heating tube is slightly sawn off, we find that holding the two sections of the sawn tube with both hands requires only a small amount of force, and the internal resistance wire is very easy to pull out. Pull it out, but at this time the magnesium oxide powder on the outside of the spiral wire is still relatively tight, which is not the same as the loosening of the powder.
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