Intelligent constructional mineral type insulation copper sheath flexible fireproof cable and manufacturing method

Abstract

The invention relates to an intelligent constructional mineral type insulation copper sheath flexible fireproof cable and a manufacturing method. The cable comprises at least one insulation core, a heat insulation filling inner jacket and an outer jacket from the inside to the outside. Each insulation core is successively provided with a conductor core, a fireproof insulation layer and a copper protection layer from the inside to the outside, wherein the copper protection layer is an enclosed seamless copper or copper alloy pipe. The heat insulation filling inner jacket is made of an inorganic mineral material, then is wrapped by a mineral fire insulation band, or is extruded by a mineral filling inner jacket material. The cable provided by the invention is an updated product of a conventional fireproof cable and has the advantages of high safety, good fireproof performance, low conductor temperature at a fire state, low line voltage reduction, high corrosion resistance, large current-carrying capacity, high mechanical strength, high water resistance, good grounding performance, quite good flexibility, long production length, convenient installation and the like.

Description

technical field [0001] The invention relates to the field of electric wires and cables, in particular to mineral-based insulated copper-sheathed flexible fireproof cables for intelligent buildings and a manufacturing method thereof. Background technique [0002] With the rapid increase of high-rise buildings and large public places, the safety requirements of buildings are getting higher and higher. Building a green, safe and environmentally friendly building is the basic architectural concept in the 21st century. How to ensure the safe operation of the lines in the building, especially in the event of a fire, to ensure that the emergency lighting, automatic alarm and disaster relief systems can work normally and quickly, and keep the power supply safe in the fire state , Fireproof cable is an indispensable product in the building. One kind of fireproof electrical technology that can meet fire protection requirements is MI type mineral insulated cable (ie BTTZ type mineral ...

AI Technical Summary

Problems solved by technology

One kind of fireproof electrical technology that can meet fire protection requirements is MI type mineral insulated cable (ie BTTZ type mineral insulated cable). This kind of cable is easy to absorb moisture due to magnesium oxide insulation, and the cable has high requirements for moisture resistance in the longitudinal direction, especially once the metal sheath at the joint If damaged or exposed to water, the cable will lose its power supply function; secondly, the cable manufacturing process also limits the length of cable manufacturing, and the cable length is shorter, causing more joints; thirdly, the cable is hard, not easy to bend, and installation and construction are inconvenient. With the advancement of technology, there are many kinds of flexible fireproof cables on the market. This kind of flexible fireproof cables can solve the problems related to MI type mineral insulated cables. At present, the flexible fireproof cables on the market are made of inorganic strip insulation and argon arc welding copper tubes. The structure includes inorganic strip insulated aluminum tube protection structure, ceramic silica gel insulated interlocking armored metal sheath structure, etc. Although these cables can meet the fire resistance test requirements stipulated in the standard, these cables generally have the following six problems: Causes a large waste of resources and high cost; (1) Unstable electrical performance and high breakdown rate; (2) High conductor temperature and large voltage drop at the end of the line in case of fire; (3) Argon arc welding seam is easy to crack when bent, Especially when burning at high temperature, it is easy to explode; (4) when the aluminum protection structure is burning at high temperature, the aluminum layer melts and cannot protect; Water disaster relief requirements; (6) Regardless of whether aluminum sheath or aluminum alloy sheath is used, the grounding resistance is large and the grounding performance is unreliable

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