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Moisture proofing method for electric heating tube oxidation magnesite powder

A technology of magnesium oxide powder and electric heating tube, which is applied in the direction of the shape of the heating element and the like, can solve the problems of high cost, complicated and cumbersome process, and achieve the effects of low cost, simple process and strong moisture-proof ability.

Active Publication Date: 2009-06-24
JIANGSHAN REWEI METAL MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method has improved the uniformity of electrical properties of the electric heating tube to a certain extent, the process is complex and cumbersome, the cost is high, and the insulation resistance can only reach 10 2 M ohms

Method used

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  • Moisture proofing method for electric heating tube oxidation magnesite powder
  • Moisture proofing method for electric heating tube oxidation magnesite powder

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Such as figure 1 The shown dust-free powder mixing device includes two parallel rollers 2 spaced apart from each other. A stainless steel cylinder 1 in contact with the rollers 2 is placed on the rollers 2. The rotation of the driving roller 2 through the power transmission drives the rotation of the stainless steel cylinder 1. .

[0023] The specific process of the method of the present invention is as follows: the dried silicon powder and magnesium oxide powder filtered through a 60-mesh filter sieve are put into a stainless steel cylinder 1, wherein the silicon powder accounts for 0.4% by weight of the mixture. Then the stainless steel cylinder 1 is covered and sealed, and the inside of the cylinder 1 can be evacuated to improve the mixing effect and shorten the mixing time. Start the roller 2 to make it rotate, and the rotation of the roller 2 drives the rotation of the stainless steel cylinder 1 on it, so that the silicon powder and the magnesium oxide powder are ...

Embodiment 2

[0026] Put the dried silicon powder and magnesium oxide powder filtered through a 70-mesh filter sieve into a stainless steel cylinder 1, wherein the silicon powder accounts for 0.8% by weight of the mixture. Then the stainless steel cylinder 1 is covered and sealed, and the inside of the cylinder 1 can be evacuated to improve the mixing effect and shorten the mixing time. Start the roller 2 to make it rotate, and the rotation of the roller 2 drives the rotation of the stainless steel cylinder 1 on it, so that the silicon powder and the magnesium oxide powder are fully mixed, and the mixing time is 20 minutes. The evenly mixed mixture of magnesium oxide powder and silicon powder is filled into the metal outer tube of the electric heating tube to make the electric heating tube. Put the completed electric heating tube into the oven, close the oven door, keep the electric heating tube at 180°C for 2 hours to complete the baking, and finally complete the production of the electric...

Embodiment 3

[0029] Put the dried silicon powder and magnesium oxide powder filtered through an 80-mesh filter sieve into a stainless steel cylinder 1, wherein the silicon powder accounts for 1.1% by weight of the mixture. Then the stainless steel cylinder 1 is covered and sealed, and the inside of the cylinder 1 can be evacuated to improve the mixing effect and shorten the mixing time. Start the roller 2 to make it rotate, and the rotation of the roller 2 drives the rotation of the stainless steel cylinder 1 on it, so that the silicon powder and the magnesium oxide powder are fully mixed, and the mixing time is 60 minutes. The evenly mixed mixture of magnesium oxide powder and silicon powder is filled into the metal outer tube of the electric heating tube to make the electric heating tube. Put the completed electric heating tube into the oven, close the oven door, keep the electric heating tube at 200°C for 1 hour to complete the baking, and finally complete the production of the electric...

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Abstract

The invention relates to a damp-proof method for electrothermal tube magnesia powder, which belongs to the electrical insulating material technical field. The damp-proof method for the electrothermal tube magnesia powder is characterized in that the method comprises the following steps: a, the silica powder filtered by a 60-80 screen mesh filter sieve is fully mixed with the magnesia powder, and the weight percentage of the silica powder in the mixture is 0.4-1.1%; b, the even mixture of the magnesia powder and the silica powder is fully filled into a metal outer tube of the electrothermal tube so as to make an electrothermal tube; c, the finished electrothermal tube is processed with high-temperature baking treatment, so as to enable the silica powder to become into the molten state and to coat on the surface of the magnesia powder. The method has the advantages that the technique is simple, the cost is low, and the insulation effect is fine; the magnesia powder processed by the method has strong damp-proof capability; the insulating resistance of the electrothermal tube made of the magnesia powder which is processed by the method can reach at the 10<6>M ohms.

Description

technical field [0001] The invention relates to a moisture-proof method for magnesium oxide powder of an electric heating tube, and belongs to the technical field of electric insulating materials. Background technique [0002] At present, the insulating material used for the electric heating tube is magnesium oxide powder, which is filled between the metal outer tube and the heating wire to play the role of insulation and heat conduction. Ordinary magnesium oxide powder will generate magnesium hydroxide after contacting with moisture in the air, thus losing its insulating effect and causing the risk of leakage and short circuit. There are two ways to solve this problem: one method is to seal the nozzle of the electric heating tube with a sealing material, so as to isolate the magnesium oxide powder of the electric heating tube from the air, and prevent the moisture in the air from contacting with the magnesium oxide powder to lose the insulation effect. Another method is to...

Claims

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Application Information

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IPC IPC(8): H05B3/52
Inventor 吕越斌
Owner JIANGSHAN REWEI METAL MFG
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