A manufacture method of U-shaped electric heating tube

A technology for electric heating tubes and production methods, applied in the direction of ohmic resistance heating components, heating elements, heating element shapes, etc., can solve the requirements of insulation, heat conduction, high temperature resistance, high voltage resistance, magnesium powder insulation structure It cannot adapt to the use requirements of electric heating tubes, high insulation layer requirements, etc., to achieve good filling effect, compact structure, and good support effect

Pending Publication Date: 2018-12-18
镇江裕太防爆电加热器有限公司
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AI Technical Summary

Problems solved by technology

[0002] The traditional U-shaped electric heating tube generally consists of a metal tube with a built-in spiral resistance wire, and then fills the gap between the resistance wire and the metal tube with crystalline magnesium oxide powder, shrinks the tube and then passes through the bend tube, and the magnesium powder is squeezed and densely filled in the tube. The space between the resistance wire and the inner wall of the metal tube constitutes the insulating structure between the heating wire and the tube wall, and has the function of heat conduction; while the bending part of the metal tube is stretched and deformed during the bending process, the inner cavity space of the corresponding position of the metal tube also has a certain The extension causes the magnesium powder in the inner cavity of the metal tube

Method used

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Embodiment Construction

[0025] A production method of U-shaped electric heating tube includes the following steps:

[0026] In the first step, the magnesia raw material made by the thermal decomposition of hydrate is sintered to make a triangular prism magnesium tube; the magnesium oxide raw material made by the thermal decomposition of hydrate has good sintering performance, moisture resistance, high temperature resistance, excellent insulation performance, and good supporting effect;

[0027] The second step is to wind the resistance wire, connect the heat-conducting rod, pretreatment, and test; specifically include: selecting the resistance wire material, diameter and mandrel according to product specifications, design requirements, and customer use conditions. In this example, the material selected is nickel-chromium electric heating alloy ; Then wash and dry, you can soak in the detergent for 3-5 minutes, then knead, rinse, and dry at 120 ℃ for 30 minutes; after washing and drying, insert the thermal con

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Abstract

The invention relates to a U-shaped electric heating tube production method, After the resistance wire penetrates into the inner cavity of the metal tube, a plurality of triangular prism magnesium tubes sintered from hydrate pyrolysis magnesium oxide raw materials are sleeved and filled with magnesium powder, and the triangular prism magnesium tubes provide a fixed support for the resistance wire,thereby preventing the resistance wire from contacting with the metal tube shell due to vibration or other factors, moisture-proof, high temperature resistance, excellent insulation performance, andgood support effect; The feeding hole of the triangular prism magnesium tube is matched with the end of the adjacent triangular prism magnesium tube to form a magnesium powder filling auxiliary channel, so that the magnesium powder can enter the inner cavity of the triangular prism magnesium tube, and the filling effect is good; The triangular prism magnesium tube will not be deformed loosely whenthe tube is bent, and the supporting effect can be maintained; Compact structure, high filling density, 15% - 20% tube shrinkage, accurate parameter control after tube shrinkage, can meet the insulation structure requirements of high temperature heating, especially suitable for electric heating tubes in high voltage explosion-proof heaters with 6600V power supply and 1000KW total power.

Description

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Claims

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Application Information

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Owner 镇江裕太防爆电加热器有限公司
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