Filled magnesium oxide mineral insulated cable and preparation method thereof

A technology of mineral insulated cables and magnesium oxide, which is applied in the manufacture of insulated cables, oxide conductors, cables/conductors, etc., can solve the problems of low density, poor impact resistance and uniformity, and achieve increased density and fire resistance. It has no effect on the insulation performance, and the effect of increasing the compressive strength

Active Publication Date: 2022-07-22
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 cable, comprising the following steps:

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

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

[0029] (...

Embodiment 2

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

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

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

[0036](3) Ta...

Embodiment 3

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

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

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

[...

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Abstract

The invention discloses a filling magnesium oxide mineral insulated cable and a preparation method thereof, comprising the following steps: (1) calcining heavy magnesium oxide powder at a high temperature of 850-950 DEG C to remove impurities, and then uniformly mixing with potassium tetrafluoroaluminate powder Mixed and placed in a holding furnace for heat preservation; (2) Put the required wire core material into the copper tube on the assembly table for billet assembly, and fix one end of the copper tube; (3) Use a magnetic separator to remove the magnetic metal before filling Inclusions, and then pour the mixed powder into the gap around the copper core in the copper tube, and use the tamping mechanism to tamper until the filling is complete; (4) Fill the wire core copper tube with the mixed powder. Stretching-annealing-re-stretching-annealing again until the wire core copper tube that meets the design specifications is drawn. It solves the problems of low density, poor impact resistance and poor uniformity in the current automatic filling method of magnesium oxide powder.

Description

technical field [0001] The invention relates to a filling magnesium oxide mineral insulating 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. Small impact, excellent electrical insulation and heat dissipation at high temperature, as an inorganic mineral material, it has high fire resistance, smokeless, non-toxic and safe, large current carrying capacity, strong overload resistance, corrosion resistance, waterproof, explosion-proof, mechanical It has the advantages of good performance and convenient installation, and is especially suitable for places with particularly high safety requirements and particularly harsh environmental conditions. [0003] There are three main methods for mass production of mineral insulated cables at home and...

Claims

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Application Information

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Patent Type & Authority Patents(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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