CN210722527U - Isolated form fireproof cable - Google Patents

Abstract

The utility model provides an isolated form fireproof cable realizes better mechanical protection and fire prevention isolation, and it includes the oversheath and reaches a plurality of heart yearns by this oversheath parcel, its characterized in that: the core wire comprises a stranded copper conductor, and an inorganic mineral insulating layer and an insulating protective layer which are sequentially coated outside the stranded copper conductor, all the core wires are surrounded by an inorganic mesh protective layer, the inorganic mesh protective layer is filled with inorganic filler, and an inorganic inner sheath and an aluminum isolation sheath are arranged between the inorganic mesh protective layer and the outer sheath. The utility model discloses a high fire-retardant flame retardant coating has been built to cabled filling, inner sheath adoption inorganic mineral filler, and heart yearn outsourcing aluminium metal sheathing has better mechanical protection and fire prevention isolation to the cable as the spacer sleeve, and the oversheath of cable adopts the low cigarette polyolefin environmental protection material of halogen-free, and the cable can easily pass through the fire-resistant test detection that the standard is relevant.

Description

An isolated fireproof cable

technical field

The utility model relates to an isolation type fireproof cable.

Background technique

The national standard "GB/T13033.1-2007 Mineral Insulated Cables and Terminals Part 1 Cables with Rated Voltage of 750V and Below", the mineral insulated cables defined by the standard use copper conductors and magnesium oxide insulated copper sheaths, which have obvious advantages compared to traditional cables. Advantages: completely fireproof, can easily pass the test of fire resistance, strong overload protection ability, high working temperature, good anti-corrosion and explosion-proof performance, long service life, but compared with traditional cables, the disadvantages are also obvious: large investment in production equipment, complex process, The specification and manufacturing length of the cable is limited by the process. Professional tools must be used for packaging, transportation, and laying connections, which is difficult to operate.

Utility model content

In order to overcome the defects of the prior art, the utility model proposes an isolation type fireproof cable, which realizes better mechanical protection and fireproof isolation, and its specific technical content is as follows:

An isolation type fireproof cable, comprising an outer sheath and several core wires wrapped by the outer sheath, the core wires comprising a stranded copper conductor and an inorganic mineral insulating layer and insulating protection sequentially wrapped around the stranded copper conductor All core wires are surrounded by an inorganic mesh sheath, which is filled with inorganic fillers, and an inorganic inner sheath and an aluminum isolation sleeve are arranged between the inorganic mesh sheath and the outer sheath. .

In one or more embodiments of the present invention, the inorganic mineral insulating layer is a mica tape mineral insulating layer.

In one or more embodiments of the present invention, the inorganic inner sheath is a mineral inner sheath containing magnesium hydroxide.

In one or more embodiments of the present invention, the outer sheath is a halogen-free low-smoke polyolefin flame retardant sheath.

The beneficial effects of the utility model are as follows: the conductor of the cable adopts a stranded conductor, which has better flexibility, the insulation of the core wire adopts a mineral insulating layer wrapped around a synthetic mica tape, and the cable-forming filling and the inner sheath of the cable are filled with inorganic minerals. The core wire is covered with aluminum metal sleeve as an isolation sleeve, which has good mechanical protection and fire isolation effect on the cable. The outer sheath of the cable is made of halogen-free low-smoke polyolefin environmental protection material. It can easily pass the standard-related fire resistance test. The isolated fireproof cable has the following advantages: 1) Good flexibility; 2) Completely good fire resistance, the melting point of magnesium hydroxide in the mineral inner sheath can reach 2800 °C; 3) Current carrying and overload capacity, the long-term working temperature can reach 250 ℃ (generally the cable is not higher than 90 ℃); 4) strong anti-corrosion and explosion-proof performance; 5) environmental protection, the service life can reach more than three times that of ordinary cables; 6) long production length, It can be produced according to customer needs; 7) The cross-section is large, and the single-core cable can reach 630mm ² ; 8) Anti-electromagnetic interference, so that the cable can be used in places where there is a strong electricity dry worry and a complex cable use environment; 9) The installation is simple, similar to Plain cable, no additional aids or installation steps are required.

Description of drawings

FIG. 1 is a schematic cross-sectional structure diagram of an isolation type fireproof cable of the present invention.

Detailed ways

Below in conjunction with accompanying drawing 1, the application scheme is further described:

An isolation type fireproof cable, comprising an outer sheath 1 and a plurality of core wires 2 wrapped by the outer sheath 1 , the core wires 2 include a stranded copper conductor 21 and an inorganic stranded copper conductor 21 wrapped in sequence. The mineral insulating layer 22 and the insulating protective layer 23, the insulating protective layer 23 plays the protective role of the inorganic mineral insulating layer 22, and all the core wires 2 are surrounded by the inorganic mesh-like protective layer 3, and the inorganic mesh-like protective layer 3 is composed of inorganic The filler 4 is filled, and the inorganic mesh sheath 3 and the inorganic mineral filler 4 (for example, glass fiber mesh, glass fiber filled rope) constitute a high flame-retardant fireproof layer; the inorganic mesh sheath 3 and the outer An inorganic inner sheath 5 and an aluminum isolation sleeve 6 are arranged between the sheaths 1, and the core wire 2 is covered with an aluminum metal sleeve as an isolation sleeve, which has better mechanical protection and fire isolation for the cable. Specifically, the inorganic mineral insulating layer 22 is a mica tape mineral insulating layer, and the inorganic inner sheath 5 is a mineral inner sheath containing magnesium hydroxide. Better fire performance. The outer sheath 1 is a halogen-free low-smoke polyolefin flame-retardant sheath, and the material is environmentally friendly, and the service life can reach more than three times that of ordinary cables.

The above preferred embodiments should be regarded as examples of the embodiments of the present application, and all technical deductions, replacements, improvements, etc. that are similar to, similar to, or based on the present application should be regarded as the protection scope of this patent.

Claims (4)

1. An isolated form fireproof cable, includes oversheath and by a plurality of heart yearns of this oversheath parcel, its characterized in that: the core wire comprises a stranded copper conductor, and an inorganic mineral insulating layer and an insulating protective layer which are sequentially coated outside the stranded copper conductor, all the core wires are surrounded by an inorganic mesh protective layer, the inorganic mesh protective layer is filled with inorganic filler, and an inorganic inner sheath and an aluminum isolation sheath are arranged between the inorganic mesh protective layer and the outer sheath.

2. The isolated fireproof cable of claim 1, wherein: the inorganic mineral insulating layer is a mica tape mineral insulating layer.

3. The isolated fireproof cable of claim 1, wherein: the inorganic inner sheath is a mineral inner sheath containing magnesium hydroxide.

4. The isolated fireproof cable of claim 1, wherein: the outer sheath is a halogen-free low-smoke polyolefin flame-retardant sheath.

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