Electrothernal tube and its forming method

Abstract

This invention is an electro-thermal tube and its molded method. It solves the question of electro-thermal tube which would be extended in length when they heating in the mould, then its length and shape cannot be controlled very accurately, and the insulation power inside the tube would not be compressed tightly. In the figure we can see the electro-thermal tube and in its inner insulation powder and electric resistance, block up at inlet of the metal tube, they keep distance with the rube and keep distance with the metal rod too. This tube has been shaped by a metal tube which has ellipse section in its face having concave and convex structure and at least has one plane structure. The step of forming the tube is to put the tube on the proper place into the model A, at the concave place on this model, and press model B upon model A. shape concave and convex structure on the metal tube's face and extend this action along the tube, when the shaping action finished, take out of the models.

Description

technical field [0001] The invention belongs to the technical field of electric heaters, and relates to an electric heating tube and a forming method thereof. Background technique [0002] The structure of the existing electric heating tube for the bottom of the electric kettle body includes a metal tube, a resistance wire arranged in the metal tube, and insulating powder, such as magnesium oxide powder, between the resistance wire and the metal tube. When it is manufactured, the resistance wire is first placed at the axis of the metal tube, and an insulating member, such as a ceramic column, is placed at one port of the metal tube, so that the end of the resistance wire is strung through it, and the ceramic column is sealed at the end of the metal tube. In the port, the insulating powder is poured from the other end of the metal tube, and the metal tube is shaken, so that the insulating powder can tightly wrap the resistance wire and separate it from the metal tube. Simila...

AI Technical Summary

Problems solved by technology

The disadvantage is that when the metal tube is stamped and formed by the stamping die, it will extend to both ends due to the smooth surface of the metal tube. On the one hand, it makes it difficult to control the dimensions of the two electrical connection ends of the electric heating tube, which affects the assembly.

On the other hand, the insulating powder inside the metal tube cannot be compacted, and it is easy to accumulate air in the space. When the electric heating tube is used, it will expand with heat and contract with cold. Expansion and contraction leading to damage

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