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Methods of Improving the Performance of Electric Heating Tube

An electric heating tube and performance technology, applied in the direction of the heating element shape and other directions, can solve the problem of not being able to improve the high temperature resistance and high temperature corrosion resistance of stainless steel tubes, and achieve the elimination of internal stress and surface hardening, easy deformation of elbows, and improved high temperature. performance effect

Active Publication Date: 2011-11-30
ZHENJIANG DONGFANG ELECTRIC HEATER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • 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: Take the outer diameter The stainless steel pipe made of 304 (Ocr18Ni9) is used as the outer tube of the electric heating tube. The electric heating wire is inserted and filled with magnesium oxide powder and then conventionally shrunk. After the treatment, the semi-finished product is treated with high temperature and bright using a protective atmosphere mesh belt high temperature furnace; After the high-temperature bright treatment, the pipe bend is processed to form "U-shaped", "W-shaped" and other shapes; the second high-temperature bright treatment is performed on the semi-finished product after the bending; the outer tube is not completely cooled after the second high-temperature bright treatment Put silicone oil into the nozzle to seal the nozzle. Some parameters of two high temperature bright treatments are as follows:

[0018] 1) Protective atmosphere: pass in ammonia gas and decompose into N 2 And H 2 Mixed gas, atmosphere pressure is 4900Pa, flow rat...

Embodiment 2

[0021] Example two, with outer diameter The stainless steel pipe made of 310S (Ocr25Ni20) is used as the outer tube of the electric heating tube. The heating wire is inserted into the heating tube and filled with magnesium oxide powder, and then the tube is conventionally shrunk. After the treatment, the semi-finished product is subjected to high temperature oxidation treatment in a protective atmosphere mesh belt high temperature furnace; After high-temperature oxidation treatment, bend the pipe to form a "U-shape", "W-shape" and other shapes; the semi-finished product after the bend is subjected to conventional moisture removal treatment; after the moisture removal treatment, the outer pipe drips at the nozzle before it is completely cooled Fill the silicone oil to seal the nozzle. Some parameters of high temperature oxidation treatment are as follows:

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

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PUM

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Abstract

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. The method is: a. using an austenitic stainless steel tube as the outer tube of the electric heating tube, using a conventional method to penetrate the electric heating wire in the outer tube and filling it with magnesium oxide powder, and then shrinking the tube to reduce the diameter of the outer tube; b. The semi-finished product after the shrinkage treatment is subjected to the first high-temperature treatment; c. After the high-temperature treatment, the bending deformation is performed to process the outer tube into a curved shape; d. After the bending process, the semi-finished product is conventionally processed. Moisture discharge treatment or stress relief treatment or a second high temperature treatment; e. Seal the nozzle after moisture discharge treatment or second high temperature treatment. The invention adds high-temperature bright treatment or high-temperature oxidation treatment or high-temperature oxidation treatment process in the appropriate process of the electric heating tube, so as to achieve the purpose of improving the high-temperature performance, reliability and service life of the electric heating tube with the most economical process 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 are generally made of metal (the most commonly used type is austenitic stainless steel) thin-walled tube as the shell, and high-resistance alloy wire is inserted into the tube as the heating wire, and the thermal insulation 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 existing manufacturing method of 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 the air ...

Claims

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Application Information

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