Method for enhancing performance of electric heating tube

An electric heating tube, performance technology, applied in the direction of the heating element shape, etc., can solve the problem that the high temperature resistance and high temperature corrosion resistance of the stainless steel tube cannot be improved, and achieve the elimination of internal stress and surface hardening state, easy deformation of the bent tube, and increase the high temperature performance effect

Active Publication Date: 2009-01-07
ZHENJIANG DONGFANG ELECTRIC HEATER +1
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can achieve the purpose of stress relief, it cannot improve the high temperature resistance and high temperature corrosion resistance of stainless steel pipes.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: outer diameter The stainless steel pipe made of 304 (Ocr18Ni9) is used as the outer pipe of the electric heating pipe, and the electric heating wire is penetrated and filled with magnesium oxide powder, and then the conventional shrinkage treatment is performed; after the treatment, the semi-finished product is subjected to high-temperature bright treatment by using a protective atmosphere mesh belt high-temperature furnace; After high-temperature bright treatment, pipe bending is performed to form "U-shaped", "W-shaped" and other shapes; the semi-finished product after bending is subjected to a second high-temperature bright treatment; after the second high-temperature bright treatment, the outer tube is not completely cooled Drop silicone oil into the nozzle to initially seal the nozzle. Some parameters of the two high-temperature brightening treatments are as follows:

[0018] 1) Protective atmosphere: pass through ammonia gas, decompose into N 2 and H ...

Embodiment 2

[0021] Embodiment 2, outer diameter The stainless steel pipe made of 310S (Ocr25Ni20) is used as the outer pipe of the electric heating pipe, and the electric heating wire is penetrated and filled with magnesium oxide powder to perform conventional shrinkage treatment; after the treatment, the semi-finished product is subjected to high-temperature oxidation treatment in a protective atmosphere mesh belt high-temperature furnace; After the high-temperature oxidation treatment, pipe bending is performed to form "U-shaped", "W-shaped" and other shapes; the semi-finished products after bending are subjected to conventional moisture removal treatment; after the moisture removal treatment, before the outer pipe is completely cooled, drip Fill in the silicone oil to initially seal the nozzle. Some parameters of high temperature oxidation treatment are as follows:

[0022] 1) Protection and control atmosphere: formed by burning, condensing and drying air and liquefied petroleum gas,...

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PUM

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Abstract

The invention relates to a method used for improving electric heating management performance, belonging to the manufacture technique of an electric heating device. The method of the invention comprises the steps as follows: a: austenitic stainless steel pipe is taken as the external pipe of the electric heating pipe; after electric heating wire and MgO powder are filled in the external pipe by a routine method, the diameter of the external pipe is shortened by the pipe contracting disposal; b: after the pipe contracting disposal, the half finished product is disposed by high temperature once; c: after the high temperature disposal, the pipe-bending process is carried out by a bending deformation method so as to bend the external pipe as bent shape; d: routine moisture-removal disposal or stress-removal disposal or secondary high-temperature disposal is carried out on the half finished product after the pipe-bending process; e: the pipe port is closed after the moisture-disposal disposal or the secondary high-temperature disposal. The method of the invention adds the high temperature polishing disposal or high temperature oxidation disposal or high temperature oxidation disposal process in suitable procedure of the processing technology of the electric heating pipe, thus achieving the objects of improving the high temperature performance, reliability and prolonging the service life of the electric heating pipe by most economical processing steps.

Description

technical field [0001] The invention belongs to the manufacturing technology of an electric heating device, and relates to a method for improving the performance of an electric heating tube. Background technique [0002] Ordinary electric heating tubes generally use metal (the most commonly used type of austenitic stainless steel) thin-walled pipe as the shell, and a high-resistance alloy wire is inserted into the tube as a heating wire, and a thermally conductive insulating material is filled between the heating wire and the inner wall of the metal tube ( Usually magnesium oxide powder). The life, insulation and reliability of the electric heating tube are mainly affected by the quality level and processing technology of the heating wire, magnesium oxide powder and metal tube. The manufacturing method of existing electric heating tube mainly has the following problems: [0003] 1. The magnesium oxide powder filled in the electric heating tube is easy to absorb moisture in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B3/52
Inventor 谭克
Owner ZHENJIANG DONGFANG ELECTRIC HEATER
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