Filled magnesium oxide mineral insulated cable and preparation method thereof

A mineral insulated cable, magnesium oxide technology, applied in the direction of insulated cables, oxide conductors, cable/conductor manufacturing, etc., can solve the problems of low compactness, impact resistance and poor uniformity, and achieve increased compactness and fire resistance It has no effect on the insulation performance and the effect of improving the insulation resistance

Active Publication Date: 2021-04-23
重庆科宝电缆股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It solves the problems of low density, poor impact resistance and poor uniformity in the current automatic filling method of magnesium oxide powder

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A preparation method for filling magnesium oxide mineral insulated cables, comprising the following steps:

[0027] (1) The heavy magnesium oxide powder is subjected to high-temperature dehumidification treatment first, and the heavy magnesium oxide powder is first sent to an electric heating drum furnace to be calcined at a high temperature of 850-950°C to remove impurities, and then mixed evenly with potassium tetrafluoroaluminate powder Pack it into a box and keep it in a holding furnace at 250-350°C to prevent the mixture from absorbing water and getting damp. The addition ratio of heavy magnesia and potassium tetrafluoroaluminate is: in parts by weight, 95 parts by weight of heavy magnesia, and 2 parts by weight of potassium tetrafluoroaluminate.

[0028] (2) Clean and decontaminate the copper tube and core material, put the required core material into the copper tube on the assembly table for blank assembly, and fix one end of the copper tube.

[0029] (3) Take o...

Embodiment 2

[0033] A preparation method for filling magnesium oxide mineral insulated cables, comprising the following steps:

[0034] (1) The heavy magnesium oxide powder is subjected to high-temperature dehumidification treatment first, and the heavy magnesium oxide powder is first sent to an electric heating drum furnace to be calcined at a high temperature of 850-950°C to remove impurities, and then mixed evenly with potassium tetrafluoroaluminate powder Pack it into a box and keep it in a holding furnace at 250-350°C to prevent the mixture from absorbing water and getting damp. The addition ratio of heavy magnesia and potassium tetrafluoroaluminate is: in parts by weight, 98 parts by weight of heavy magnesia, and 5 parts by weight of potassium tetrafluoroaluminate.

[0035] (2) Clean and decontaminate the copper tube and core material, put the required core material into the copper tube on the assembly table for blank assembly, and fix one end of the copper tube.

[0036](3) Take ou...

Embodiment 3

[0040] A preparation method for filling magnesium oxide mineral insulated cables, comprising the following steps:

[0041] (1) The heavy magnesium oxide powder is subjected to high-temperature dehumidification treatment first, and the heavy magnesium oxide powder is first sent to an electric heating drum furnace to be calcined at a high temperature of 850-950°C to remove impurities, and then mixed evenly with potassium tetrafluoroaluminate powder Pack it into a box and keep it in a holding furnace at 250-350°C to prevent the mixture from absorbing water and getting damp. The addition ratio of heavy magnesia and potassium tetrafluoroaluminate is: in parts by weight, 95 parts by weight of heavy magnesia, and 4 parts by weight of potassium tetrafluoroaluminate.

[0042] (2) Clean and decontaminate the copper tube and core material, put the required core material into the copper tube on the assembly table for blank assembly, and fix one end of the copper tube.

[0043] (3) Take o...

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Abstract

The invention discloses a filled magnesium oxide mineral insulated cable and a preparation method thereof. The preparation method comprises the following steps of: (1) calcining heavy magnesium oxide powder at a high temperature of 850-950 DEG C to remove impurities, then uniformly mixing the calcinated heavy magnesium oxide powder with potassium tetrafluoroaluminate powder, and placing the mixture in a heat preservation furnace for heat preservation; (2) putting a required wire core material into a copper pipe on an assembly table for blank assembly, and fixing one end of the copper pipe; (3) before filling, adopting a magnetic separator to remove magnetic metal inclusions, then pouring the mixed powder into a gap around the copper core in the copper pipe, and using a tamping mechanism for tamping the mixed powder until the mixed powder is filled well while pouring is conducted; and (4) subjecting the wire core copper pipe filled with the mixed powder to stretching, annealing, stretching again and annealing again until a wire core copper pipe meeting the design specification and size is stretched out. The problems that an existing magnesium oxide powder automatic filling method is low in compactness and poor in impact resistance and uniformity are solved.

Description

technical field [0001] The invention relates to a filling magnesium oxide mineral insulated cable and a preparation method thereof, belonging to the field of insulating materials. Background technique [0002] Mineral insulated cables are cables composed of inorganic mineral materials, usually made of magnesium oxide powder as the mineral insulating layer compressed and compacted, its melting point (2800 ° C) far exceeds the melting point of copper sheath (1083 ° C), and the resistivity is affected by temperature changes Small impact, excellent electrical insulation and heat dissipation at high temperatures, as an inorganic mineral material, has high fire resistance, smoke-free, non-toxic, safe, large carrying capacity, strong overload resistance, corrosion resistance, waterproof, explosion-proof, mechanical With the advantages of good performance and convenient laying, it is especially suitable for places with extremely high safety requirements and extremely harsh environme...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B13/18H01B13/00H01B1/08H01B7/02H01B7/18H01B7/282H01B7/29
CPCH01B13/18H01B13/0016H01B7/02H01B1/08H01B7/292H01B7/282H01B7/18Y02A30/14
Inventor 符靓黄美华夏世全陈先华谢华林李建波
Owner 重庆科宝电缆股份有限公司
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