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Mineral insulated fireproof cable and preparation method thereof

A fireproof cable, mineral insulation technology, applied in insulated cables, cable/conductor manufacturing, insulated conductors, etc., can solve the problem of inability to produce large-length mineral insulated fireproof cables, reduce the number of cable joints, reduce construction time, and facilitate laying Effect

Inactive Publication Date: 2020-06-30
广州市穗羽电线电缆有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the technical problem that the existing technology cannot produce large-length mineral insulated fireproof cables, and to provide a mineral insulated fireproof cable and its preparation method

Method used

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  • Mineral insulated fireproof cable and preparation method thereof
  • Mineral insulated fireproof cable and preparation method thereof
  • Mineral insulated fireproof cable and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] like Figure 1 to Figure 5 As shown, a preferred structure of a mineral insulated fireproof cable according to the present invention.

[0061] like figure 1 As shown, the mineral insulated fireproof cable includes a cable core 20 , a magnesium oxide filling layer and a seamless copper tube 10 arranged sequentially from the inside to the outside. Wherein, the cable core 20 is a single-strand copper conductor, such as a copper rod. The cable core 20 is coaxially arranged with the copper tube 10, and the magnesium oxide filling layer is densely filled between the cable core 20 and the copper tube 10 to realize insulation, fire resistance and high temperature resistance of the cable, and the magnesium oxide filling layer The layer belongs to the inorganic filling material, combined with the copper tube 10 and the copper rod, the mineral insulated fireproof cable is all composed of inorganic materials, so there is no problem of insulation aging, and the service life can re...

Embodiment 2

[0075] The present invention also provides a preparation method of a mineral insulated fireproof cable, which is used to make the mineral insulated fireproof cable of the above-mentioned embodiment 1 and embodiment 3, and based on the preparation method provided by the present invention, the length of the BTTZ cable is less than 100 meters To solve the problem, realize the production of large-length mineral insulated fireproof cables, and the length can be customized according to customer requirements.

[0076] Specifically, the preparation method of the mineral insulated fireproof cable includes the following steps:

[0077] (1) Pretreatment: remove the surface impurities of the copper rod and copper strip, and dry and dehumidify the magnesium oxide powder and the magnesium oxide column; the magnesium oxide column is assembled by two mutually symmetrical half cylinders .

[0078] (2) Copper pipe shaping: send the copper strip into the shaping mold, roll the copper strip into...

example 1

[0112] In the example 1 of the present invention, a kind of production method of BTTZ fireproof cable comprises the following steps:

[0113] (1) Pretreatment: remove surface impurities of copper rod and copper strip, and dry and dehumidify magnesium oxide powder and magnesium oxide column.

[0114] (2) Copper pipe shaping: send the copper strip into the shaping mold, roll the copper strip into a tubular shape to obtain a tubular copper strip, then straighten the copper rod and penetrate into the middle of the tubular copper strip, and make the copper rod and the copper rod through the fixed core mold Copper belt concentric;

[0115] Wherein, the setting mold and the core fixing mold are arranged obliquely, so that the tubular copper strip and the copper rod are inclined, and the included angle between them and the horizontal plane is the same as 40°.

[0116] (3) Magnesium oxide filling: Fill the magnesium oxide powder into the middle of the copper rod and the tubular copper...

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Abstract

The invention discloses a mineral insulated fireproof cable. The mineral insulated fireproof cable comprises a cable core, a magnesium oxide filling layer and a seamless copper pipe which are sequentially arranged from inside to outside; the cable core is a single-strand copper conductor, and the cable core and the copper pipe are coaxially arranged. The magnesium oxide filling layer is densely and seamlessly filled between the cable core and the copper pipe, the magnesium oxide filling layer comprises magnesium oxide powder and magnesium oxide pipe columns which are sequentially arranged at intervals along the axis direction of the cable core, and the magnesium oxide pipe columns are sleeved on the cable core. The mineral insulation fireproof cable comprises a cable core, a magnesium oxide filling layer and a seamless copper pipe which are sequentially arranged from inside to outside. The fireproof insulation characteristic is good. The magnesium oxide filling layer is densely and seamlessly filled between the cable core and the copper pipe to realize insulation, fire resistance and high temperature resistance of the cable, and the magnesium oxide filling layer belongs to an inorganic filling material, so that the problem of insulation aging does not exist, and the service life of the cable can be more than three times that of a common cable.

Description

technical field [0001] The invention belongs to the technical field of mineral cables, and in particular relates to a mineral insulated fireproof cable and a preparation method thereof. Background technique [0002] BTTZ cable is a mineral insulated cable, a copper core copper sheath magnesium oxide insulated heavy-duty fireproof cable. Specifically, it is a new type of cable whose outer layer is made of seamless copper tube sheath, the middle is filled with magnesium oxide crystal powder as the insulating material, and the conductor is composed of a single-strand copper rod. BTTZ cable has the characteristics of high temperature resistance, fire prevention, explosion-proof, non-combustible (continuous long-term operation at 250°C, and short-term operation for 30 minutes at 1000°C limit state) and large carrying capacity. Therefore, it is widely used in dangerous, harsh and high-temperature environments such as nuclear power plants, metallurgy, chemicals, mines, and kilns. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B3/10H01B7/02H01B7/20H01B7/282H01B7/29H01B13/22
CPCH01B3/10H01B7/02H01B7/20H01B7/282H01B7/29H01B13/22H01B13/221H01B13/227Y02A30/14
Inventor 林佳鸿
Owner 广州市穗羽电线电缆有限公司
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