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Mineral insulated metal sheath fireproof cable and preparation method thereof

A metal sheath and mineral insulation technology, applied in the direction of insulated cables, cable/conductor manufacturing, insulated conductors, etc., can solve the problems of harsh manufacturing environment, short project length, thin aluminum metal sheath, etc.

Pending Publication Date: 2017-01-04
上海市高桥电缆厂有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention overcomes the slow production speed, short engineering length, many joints, harsh manufacturing environment and complex on-site installation process of BTT mineral insulated cables with magnesium oxide insulated copper tube sheaths in the prior art, and the performance of ordinary mineral insulated cables cannot meet BS6387 Standard C.W.Z level, and continuous extruded mineral insulated metal sheathed fire-resistant cables have no stable impact-proof structure due to the singleness of structural design, and the fire-resistant performance is not stable enough. The thickness of the aluminum metal sheath is too thin, and the DC resistance of the conductor cannot reach The requirements of the standard cannot meet the requirements of the grounding core (PE wire), and the defects of the 2-hour fire-resistant impact test specified in BS 8491 provide a mineral-insulated metal-sheathed fire-resistant cable and its manufacturing method

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0080] The fire-resistant cable with mineral insulated metal sheath of this embodiment, figure 1 A schematic diagram of its cross-sectional structure. It includes four insulated wire cores, the outer layer of the insulated wire cores is a mineral insulating layer 2, and a metal conductor 1 is arranged inside the mineral insulating layer 2; a metal sheath 3 is formed on the outside of each insulated wire core by extruding. The metal sheath 3 is covered with an anti-corrosion plastic layer 4, and the anti-corrosion plastic layer 4 is covered with a mineral oxygen barrier layer 5, and the mineral oxygen barrier layer 5 is coated with an inner flame-retardant layer 6, and the inner flame-retardant layer 6 is coated with a mineral refractory expansion layer 7, a metal reinforcement layer 8 is woven outside the mineral refractory expansion layer 7, an outer flame retardant layer 9 is coated on the metal reinforcement layer 8, and a Outer sheath10. Among them, the material of the m...

Embodiment 2

[0095] The material of the anti-corrosion plastic layer of the fire-resistant cable with mineral insulated metal sheath in this embodiment is polyethylene.

[0096] The preparation method of the mineral insulated metal sheath fire-resistant cable of the present embodiment comprises the following steps:

[0097] (1) Strand the copper conductor monofilament into a metal conductor, and then wrap the refractory mica tape on the outside to form a mineral insulation layer and make an insulated core; the cross-sectional area of ​​the conductor is 630mm 2 , the thickness of the mineral insulating layer is 1.8mm;

[0098] (2) Before the operation steps of continuous extrusion of aluminum metal, the aluminum metal is pretreated according to the following steps: first, use a brush device to remove dust and other dirt on the surface of the aluminum metal, and then use an online cleaning system to wash off the oil on the surface , to clean the surface of aluminum metal. The pretreated al...

Embodiment 3

[0109] The preparation method of the mineral insulated metal sheath fire-resistant cable of the present embodiment comprises the following steps:

[0110] (1) Strand the copper conductor monofilament into a metal conductor, and then wrap the refractory mica tape on the outside to form a mineral insulation layer and make an insulated core; the cross-sectional area of ​​the conductor is 300mm 2 , the thickness of the mineral insulating layer is 1.0mm;

[0111] (2) Before the operation steps of continuous extrusion of aluminum metal, the aluminum metal is pretreated according to the following steps: first, use a brush device to remove dust and other dirt on the surface of the aluminum metal, and then use an online cleaning system to wash off the oil on the surface , to clean the surface of aluminum metal. The pretreated aluminum metal is continuously extruded on the outside of the insulated wire core. Before extrusion, the cavity of the extruder is first placed in an oven at 600...

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Abstract

The invention discloses a mineral insulated metal sheath fireproof cable and a preparation method thereof. The cable comprises a cable core, a mineral matter oxygen barrier layer, an inner flame retardation layer, a mineral matter fireproof expansion layer, a metal reinforcing layer, an outer flame retardation layer and an oversheath; the cable core comprises insulating cores, and each insulating core is wrapped in an aluminum metal sheathe and an anticorrosion plastic layers successively; a mineral matter insulation layer services as an external layer of each insulating core, and internally provided with metal conductors; and the cable core is wrapped in the mineral matter oxygen barrier layer, the inner flame retardation layer, the mineral matter fireproof expansion layer, the metal reinforcing layer, the outer flame retardation layer and the oversheath successively. The cable of the invention can reach the CWZ grade of BS6387 standard, and satisfy 2h of fireproof bump test prescribed by the BS8491 standard, the production speed is high, the whole cable can be produced in a continuous and long manner, onsite installation technology is simple, and the cable can be applied to power distribution, illumination, control and alarm systems requiring for circuit completeness.

Description

technical field [0001] The invention relates to a cable, in particular to a fire-resistant cable with a mineral insulated metal sheath and a preparation method thereof. Background technique [0002] Ordinary plastic insulated fire-resistant cables cannot meet the fire-resistant requirements of 950°C for 3 hours in terms of fire resistance, and have no waterproof, impact-proof and other functions, so it is difficult to meet the needs of the market. Mineral insulated cables are mainly made of inorganic minerals or mineral compounds. These materials generally have a high melting point and are not easy to burn or support combustion under flame conditions, and have gradually become a research hotspot in recent years. [0003] Since the flexible mineral insulated cable adopts the welding process of copper strip longitudinal wrapping, the weld seam is easy to miss and fall off, the waterproof performance is poor, and the weld seam is easy to crack when it is bent or burned. [000...

Claims

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Application Information

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IPC IPC(8): H01B7/00H01B7/17H01B7/28H01B7/282H01B7/20H01B7/22H01B7/29H01B7/295H01B7/42H01B13/00
Inventor 张志清张国宾刘磊
Owner 上海市高桥电缆厂有限公司
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