Magnesium oxide insulating copper sheath heating cable

A technology for heating cables and copper sheaths, applied in the direction of insulated cables, insulated conductors, cables, etc., can solve the problems of cable performance degradation and inability to use, and achieve good heat resistance, good protection, good thermal conductivity and insulation performance Effect

Active Publication Date: 2021-11-09
浙江元通线缆制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, during the installation process of the magnesium oxide insulated heating cable, the cable end needs to be stripped to expose the conductor and to be connected, and because magnesium oxide is easy to absorb moisture and convert carbon dioxide, it gradually becomes the preferred material of magnesium hydroxide or basic magnesium carbonate. characteristics, if the cable head is not completed within one hour, the insulation resistance will drop below 10MΩ, resulting in a significant decrease in cable performance, or even unusable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Preparation of thermally conductive powder

[0025] S1: According to the mass ratio of 75:1, take silicon powder and aluminum powder respectively, place them in a ball mill for a ball mill, and ball mill for 15 minutes at a frequency of 1200r / min and a mass ratio of ball to material of 3:1, mix well, and add silicon The sodium chloride of 0.3% of the total mass of powder and aluminum powder is carried out secondary ball milling, and the frequency is 1000r / min, ball milling 20min under the condition of 3:1 mass ratio of ball to material, and mixing obtains the mixed material;

[0026] S2: Put the mixed material in a ceramic boat, then put it into a high-temperature tube furnace, and conduct a heating reaction at 1400°C in a nitrogen atmosphere for 10 hours. After the reaction is completed, take out the reactant, add deionized water after grinding, Ultrasonic cleaning and drying to obtain aluminum-doped nano-silicon nitride particles;

[0027] S3: Submerge the aluminum-d...

Embodiment 2

[0033] Preparation of thermally conductive powder

[0034] S1: According to the mass ratio of 50:1, take silicon powder and aluminum powder respectively, place them in a ball mill for a ball mill, and ball mill for 12 minutes at a frequency of 1100r / min and a mass ratio of ball to material of 3:1, mix well, and add silicon The sodium chloride of 0.2% of the total mass of powder and aluminum powder is carried out secondary ball milling, and the frequency is 800r / min, ball milling 15min under the condition of 3:1 mass ratio of ball to material, and mixing obtains the mixed material;

[0035] S2: Put the mixed material in a ceramic boat, then put it into a high-temperature tube furnace, and conduct a heating reaction at 1300°C in a nitrogen atmosphere for 12 hours. After the reaction is completed, take out the reactant, add deionized water after grinding, Ultrasonic cleaning and drying to obtain aluminum-doped nano-silicon nitride particles;

[0036] S3: Submerge the aluminum-do...

Embodiment 3

[0042]Preparation of thermally conductive powder

[0043] S1: According to the mass ratio of 60:1, take silicon powder and aluminum powder respectively, put them in a ball mill for a ball mill, and ball mill for 10 minutes at a frequency of 1200r / min and a mass ratio of ball to material of 3:1, mix well, and add silicon The sodium chloride of 0.3% of the total mass of powder and aluminum powder is carried out secondary ball milling, and the frequency is 900r / min, ball milling 20min under the condition of 3:1 mass ratio of ball to material, and mixing obtains the mixed material;

[0044] S2: Put the mixed material in a ceramic boat, then put it into a high-temperature tube furnace, and conduct a heating reaction at 1400°C in a nitrogen atmosphere for 11 hours. After the reaction is completed, take out the reactant, add deionized water after grinding, Ultrasonic cleaning and drying to obtain aluminum-doped nano-silicon nitride particles;

[0045] S3: Submerge the aluminum-doped...

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PUM

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Abstract

The invention relates to the technical field of cables, in particular to a magnesium oxide insulating copper sheath heating cable. According to the magnesium oxide insulation copper sheath heating cable, a protection section is arranged at the end of the cable, an isolation protection layer is arranged at the position, between a conductor and a copper sheath, of the protection section, the isolation protection layer comprises multiple layers of supporting nets which are mutually overlapped and heat conduction powder filled among the supporting nets, and the supporting net is formed by weaving carbon nanofibers and copper fibers and is of a wave-shaped structure. According to the heating cable prepared by the invention, the protection section is arranged at the end part of the cable, and the magnesium oxide insulating layer filled in the middle is not exposed in the air during installation, so that the problem that the insulation resistance is reduced due to the fact that magnesium oxide absorbs moisture and carbon dioxide is avoided.

Description

technical field [0001] The invention relates to the technical field of cables, in particular to a magnesium oxide insulated copper sheathed heating cable. Background technique [0002] Heating cables are usually cables made by embedding copper conductors in seamless copper tubes that have been fully dried and compacted with magnesium oxide powder as insulating material. Since the entire cable is made of inorganic materials, it has the characteristics of high temperature resistance, fire prevention, explosion protection, and non-combustibility. It can run continuously for a long time at 250°C, and can run for a short time of 30 minutes at 1000°C. It has high mechanical strength. , Long service life, generally do not need an independent grounding wire. Mainly used in high temperature, radiation or high corrosion fields such as petroleum, chemical industry, metallurgy, shipbuilding, nuclear power, aerospace, etc. In addition, due to its structural characteristics, the cable is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B7/17H01B7/42H01B7/40H01B7/29H01B7/28H01B7/02
CPCH01B7/17H01B7/428H01B7/40H01B7/29H01B7/28H01B7/02
Inventor 李伟钢徐季新黄桂领
Owner 浙江元通线缆制造有限公司
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