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Double-shielded mineral-insulated cable and manufacturing method thereof

A mineral insulated cable, double shielding technology, used in insulated cables, insulated conductors, inorganic insulators, etc., can solve the problems of signal influence, low mechanical strength, and short service life of cables, so as to achieve less signal interference and a wide range of applications. , the effect of long service life

Active Publication Date: 2010-03-17
久盛电气股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the structure and material, the use environment of the cable is limited, such as the use condition is below 70 ℃, and after a period of use, due to the aging of the material, the conductor resistance will increase, and the leakage current of the insulating medium will increase; the outer sheath It is a polyethylene material with low mechanical strength. After the cable is deformed, its symmetry and characteristic impedance will be destroyed, which will affect the signal during transmission. The service life of the cable is not long

Method used

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  • Double-shielded mineral-insulated cable and manufacturing method thereof

Examples

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Effect test

Embodiment 1

[0025] A double-shielded mineral insulated cable, which includes a copper core wire inner conductor 1, an inner magnesium oxide insulating medium 2, a copper tube outer conductor 3, an outer magnesium oxide insulating medium 4, and a copper-nickel alloy sheath 5 from inside to outside. The diameter of the conductor is 0.3mm, the thickness of the inner magnesium oxide insulating medium 2 is 0.45mm, the thickness of the copper tube outer conductor 3 is 0.15mm, the thickness of the outer magnesium oxide insulating medium 4 is 1.5mm, and the outer diameter of the copper tube sheath 5 is 5mm. The characteristic impedance of this cable is 50Ω.

[0026] The product described in the present embodiment is manufactured by following method, and this method comprises the following steps successively:

[0027] ①Compressing and sintering of inner and outer insulating layers: Send the granulated magnesium oxide powder into the charging barrel of the dry powder press to press into inner insul...

Embodiment 2

[0033] The only difference from the first embodiment is that the insulating material is aluminum oxide, and the sheath is a copper-nickel alloy sheath.

[0034] The manufacturing method of the product described in this embodiment is consistent with Embodiment 1.

Embodiment 3

[0036] The only difference from the first embodiment is that the insulating material is silicon dioxide, and the sheath is a high-temperature alloy steel pipe.

[0037] The manufacturing method of the product described in this embodiment is also the same as in Embodiment 1.

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Abstract

The invention relates to a double-shielded mineral-insulated cable which is mainly applied to the fields of high-frequency signal transmission in occasions with high ambient temperature and high radiation, such as the communication fields of metallurgy, medical treatment, aerospace, military and the like. The double-shielded mineral-insulated cable comprises an inner conductor, an insulating medium, an outer conductor, an insulating medium and a protective sleeve in sequence from inside to outside, and is characterized in that the insulating medium is magnesium oxide, aluminum oxide or silicondioxide. Compared with the existing double-shielded cable, the double-shielded mineral-insulated cable has the advantages of longer service life and wider use range; in addition, the double-shieldedmineral-insulated cable has excellent performance, has little interference to transmitted signals and can be used for the communication fields of metallurgy, medical treatment, aerospace, military andthe like.

Description

technical field [0001] The invention relates to a double-shielded mineral insulated cable, which is mainly used in the field of high-frequency signal transmission in high ambient temperature and high radiation occasions, such as metallurgy, medical treatment, aerospace, military and other communication fields. Background technique [0002] The existing double-shielded cable consists of 4 parts: inner conductor, insulating medium, outer conductor and sheath. The inner conductor is composed of a solid conductor; the insulating medium usually adopts polyethylene, polypropylene, polyvinyl chloride and fluoroplastic, etc., and the most commonly used insulating medium is polyethylene with low loss and good process performance; the outer conductor has dual functions, It is not only a wire in the transmission circuit, but also has a shielding effect; the outer sheath is usually made of polyethylene. Due to the structure and material, the use environment of the cable is limited, suc...

Claims

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Application Information

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IPC IPC(8): H01B11/18H01B3/10H01B7/22H01B13/016
Inventor 罗才谟
Owner 久盛电气股份有限公司
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