Rigid mineral insulated fireproof cable

A mineral insulated, fire-resistant cable technology, applied in the direction of insulated cables, insulated conductors, flexible cables, etc., can solve the problems of low impact protection level, lack of high temperature protection, and long-term fire resistance, etc., and reach the temperature resistance level High, improved heat dissipation, stable strength effect

Pending Publication Date: 2022-05-13
ZHEJIANG CHENGUANG CABLE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Existing fireproof materials for cables usually have a single-layer structure, which has a low level of physical impact resistance and a single function. At the same time, the material has poor fire resistance and cannot withstand fire for a long time. In the case of burning objects in the surrounding environment, the heat insulation performance is poor. Can not play the role of high temperature protection, causing the cable to be damaged and causing danger

Method used

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  • Rigid mineral insulated fireproof cable
  • Rigid mineral insulated fireproof cable
  • Rigid mineral insulated fireproof cable

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Such as Figure 1-2 As shown, a mineral insulation fire protection provided in this embodiment includes a first conductor 1, wherein the number of the first conductor 1 is 1 to 5 strands, and is a solid structure. In this embodiment, the number of the first conductor 1 is 1 strand, the first conductor 1 is copper; the conductor surface of the first conductor 1 is filled with high-purity magnesia insulating layer 2, and the surface of the high-purity magnesia insulating layer is welded and rolled and drawn copper sheath 3, welded and rolled and drawn copper sheath The surface of the sleeve 3 is extruded with a halogen-free low-smoke flame-retardant polyolefin sheath 4 as required.

Embodiment 2

[0040] Such as Figure 3-4 As shown, a rigid mineral insulated fireproof cable provided in this embodiment includes a first conductor 1, wherein the number of the first conductor 1 is 1 to 5 strands, and is a solid structure. In this embodiment, the first conductor 1 The quantity is 3 strands, the first conductor 1 is copper; the conductor surface of the first conductor 1 is filled with high-purity magnesia insulating layer 2, and the surface of the high-purity magnesia insulating layer is welded, rolled and drawn copper sheath 3, welded, rolled and drawn The surface of the copper sheath 3 is extruded with a halogen-free low-smoke flame-retardant polyolefin sheath 4 as required.

[0041] The cable of the present invention has high temperature resistance and long service life, can be applied to various natural high temperature environments, has high reliability, is less affected by climate conditions and surrounding environments, and has stable transmission performance; it is g...

Embodiment 3

[0067] Embodiment 3, the correction factor table when the ambient air temperature is not equal to 30°C (for the ampacity of cables laid in the air)

[0068] ambient temperature PVC outer sheath and inaccessible bare sheath Bare sheath not allowed to touch 25 1.07 1.04 30 1.00 1.00 35 0.93 0.96 40 0.85 0.92 45 0.77 0.88 50 0.67 0.84 55 0.57 0.80 60 0.45 0.75 65 —— 0.70 70 —— 0.65 75 —— 0.60 80 —— 0.54

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Abstract

The invention relates to a rigid mineral insulated fireproof cable, which comprises at least one strand of first conductor, the surface of the first conductor is filled with a magnesium oxide insulating layer, the surface of the magnesium oxide insulating layer is welded and rolled with a copper sheath, and the surface of the welded and rolled copper sheath is extruded with a cable halogen-free low-smoke flame-retardant polyolefin sheath; the structural design of the cable can reduce the thickness of the copper sleeve; the surface of the copper sleeve is round and smooth, so that a longitudinal waterproof effect is achieved; and the copper sleeve can be used for grounding, so that larger current can be better unloaded, and the safe operation of the cable is ensured.

Description

technical field [0001] The invention belongs to the technical field of electric wires and cables, and in particular relates to a rigid mineral insulated fireproof cable. Background technique [0002] With the frequent occurrence of fire accidents, people's awareness of the fire hazards of wires and cables continues to deepen, and the relevant departments have higher and higher requirements for the performance of wires and cables such as fire resistance and flame retardancy. Because the cable fire has the characteristics of rapid spread, difficulty in fighting, secondary hazards, and long recovery time, it will bring huge losses to the national economy and the lives and properties of the people. Therefore, people put forward more stringent operating conditions for the flame retardant, fireproof characteristics, safety and reliability of wires and cables. Such as fireproof, explosion-proof, strong overload capacity, long service life, under fire conditions, fire elevators, fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B7/42H01B7/04H01B7/282H01B7/29H01B7/02H01B7/295H01B7/17
CPCH01B7/42H01B7/04H01B7/2825H01B7/29H01B7/02H01B7/295H01B7/17
Inventor 张玉成岳振国张仲奇张永杰韩其芳
Owner ZHEJIANG CHENGUANG CABLE CO LTD
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