Finned tubular electric heating element, fabricating technique, and fabricating apparatus

Abstract

The invention comprises: an electric heating tube and a fin expansion board. The fin expansion board is composed of multi groups of identical fin plates; its one end closely wraps the electric heating tube. The fin expansion board of the invention can be made into the one with larger size so as to have better cooling effect.

Description

technical field [0001] The invention relates to a finned electric heating tube and a processing technology for processing the finned electric heating tube. Background technique [0002] The electric heating tube in the prior art is to put the spiral core into the metal outer casing, then fill it with magnesium oxide powder and oscillate to compact it, and finally reduce the diameter slightly to form it. Because the heating wire core designed by the electric heating tube is a spiral structure, the power density is high, and the standard maximum manufacturing length of the electric heating tube is only 10m, so that the heat dissipation surface area is small, resulting in its surface heating power density (2 ~ 7w / cm2 ) is too large. The performance is that the surface temperature is too high, which usually exceeds the carbon deposition and scaling temperature of the heating medium, and eventually leads to a vicious cycle of high temperature-scaling-high temperature-scaling. I...

AI Technical Summary

Problems solved by technology

Since the fins in the above scheme are on the outer surface of the electric heating tube, the area of ​​the fins is small, the heat dissipation effect is not good, and it is easy to cause heat concentration

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