CN213958660U - High-temperature-resistant mineral-insulated fireproof cable - Google Patents

Abstract

The application relates to a high temperature resistant mineral insulation fireproof cable relates to the field of line cable, and it includes the inner core, inner core from interior to exterior has shielding layer, mineral insulating layer, compressive layer and crust in proper order the cladding, the compressive layer is the composite braid layer that dacron silk and wire constitute. This application has the intensity that promotes the compressive layer, avoids damaging the cable, influencing follow-up electric power and signal transmission's effect at the laying process as far as possible.

Description

High-temperature-resistant mineral-insulated fireproof cable

Technical Field

The application relates to the field of electric wires and cables, in particular to a high-temperature-resistant mineral insulation fireproof cable.

Background

The fire-resistant cable is a cable capable of keeping safe operation for a certain time under the condition of flame combustion, and is widely applied to places related to fire safety and fire-fighting lifesaving, such as high-rise buildings, underground railways, underground streets, large-scale power stations, important industrial and mining enterprises and the like, for example, power supply lines and control lines of emergency facilities such as fire-fighting equipment, emergency guide lamps and the like.

In the related art, a chinese patent with application number 201520164861.3 proposes a cable, which includes a plurality of cable cores, a PP rope filling layer, a polyester yarn braiding layer and an outer sheath, wherein the cable cores sequentially include a plurality of conductors, color bands and a polyolefin inner sheath from inside to outside, and metal braiding layers braided by copper-plastic composite tapes are respectively disposed between the conductors and the color bands in the cable cores and between the polyester yarn braiding layer and the outer sheath. The utility model discloses a set up the metallic braid layer in the cable core, this metallic braid layer has played the shielding effect between the cable core well, and interference immunity improves and has reduced the crosstalk promptly; and the same metal braided layer is arranged between the polyester yarn braided layer and the outer sheath, so that the external interference resistance is effectively improved.

With respect to the related art in the above, the inventors consider that there are the following drawbacks: in the cable laying process, the impact of stones in the soil layer can be received, and if the external impact force is too large, the outer shielding layer of the cable can be broken, so that the transmission effect of the cable is influenced.

SUMMERY OF THE UTILITY MODEL

In order to avoid transmission line and signal line impaired in the cable laying process as far as possible, the application provides a high temperature resistant mineral insulation fireproof cable.

The application provides a pair of high temperature resistant mineral insulation fireproof cable adopts following technical scheme:

the utility model provides a high temperature resistant mineral insulation fireproof cable, includes the inner core, the inner core from interior to exterior in proper order the cladding have shielding layer, mineral insulating layer, anti-compression layer and crust, the anti-compression layer is the compound weaving layer that dacron silk and wire constitute.

Through adopting above-mentioned technical scheme, the mineral insulating layer has fire-resistant protection's effect, the shielding layer can prevent the signal interference who produces between the adjacent cable that lays, crust insulation protection constructor, the resistance to compression layer woven by dacron silk and wire plays the guard action to shielding layer and inner core, when the cable received wearing and tearing or extrusion, the dacron silk is wear-resisting, the wire is difficult for breaking, and weave itself and can strengthen being connected between dacron silk and the wire, thereby promote the intensity on resistance to compression layer, avoid laying the in-process and damaging the cable as far as possible, influence the transmission of follow-up electric power and signal.

Optionally, the diameter of the metal wire in the pressure-resistant layer is 0.1-0.2 mm.

Through adopting above-mentioned technical scheme, the thinner the metal wire, the better its bending property of itself is, weave with the dacron silk more easily, and be difficult for producing the gap in the junction, if the diameter of metal wire exceeds 0.2mm, not only increased the degree of difficulty of weaving, and increased manufacturing cost.

Optionally, every two metal wires in the pressure-resistant layer are woven and wound to form a metal belt.

Through adopting above-mentioned technical scheme, the wire diameter reduces and makes the wire easily buckle, also makes the wire easily fracture, weaves two wires and twines into the strap, and the diameter of strap increases little for a single wire relatively, but the fracture resistance of self greatly strengthens, has promoted the intensity on resistance to compression layer.

Optionally, the diameter of the polyester yarn in the pressure-resistant layer is 1-1.2 mm.

Through adopting above-mentioned technical scheme, the dacron silk mainly provides the wearability on anti-compression layer, and the dacron silk is too thin then can not play due effect, and then too thick when the dacron silk diameter is greater than 1.2mm for the anti-compression layer of weaving out is too thick, and then makes the holistic diameter of cable too big, is unfavorable for the transportation also not to lay.

Optionally, the metal tape is wound around an outer circumferential side of the polyester yarn.

Through adopting above-mentioned technical scheme, because the diameter difference between strap and the dacron silk is great, weave the resistance to compression layer with the dacron silk again after twining the dacron silk on the dacron silk, when guaranteeing and having strengthened resistance to compression layer wearability, also guaranteed the structural strength on resistance to compression layer.

Optionally, the mineral heat insulation layer is a magnesium oxide layer, and the heat insulation layer is arranged on the inner side wall of the pressure resistant layer.

By adopting the technical scheme, the melting point of the magnesium oxide is higher than that of the aluminum, so that the shielding layer and the power and signal transmission lines inside the shielding layer can normally work at extremely high temperature, and the fire resistance of the cable is realized.

Optionally, the shielding layer is an aluminum foil layer.

Through adopting above-mentioned technical scheme, the aluminium foil has shielding effect to the transmission such as the inside electric power of cable, signal, has avoided when laying the cable side by side, and the condition that adjacent cable produced the interference produces.

Optionally, the shielding layer covers the outer peripheral side of the inner core, the inner core includes a power transmission line and a signal line, and PP rope filling layers are filled between the mineral heat insulation layer and the power transmission line and between the signal line and the mineral heat insulation layer.

By adopting the technical scheme, the PP rope filling layer enables the positions of transmission lines such as circuits and signals in the cable to be relatively fixed, and the transmission performance of the cable is ensured.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the polyester yarns are wear-resistant, the metal yarns are not easy to break, and the connection between the polyester yarns and the metal yarns can be enhanced by weaving, so that the strength of the pressure-resistant layer is improved, and the cable is prevented from being damaged in the laying process and the subsequent transmission of electric power and signals is prevented from being influenced as much as possible;

2. the thinner the metal wire is, the better the bending performance of the metal wire is, the easier the metal wire is to weave with the polyester yarn, and the joint part is not easy to generate a gap;

3. the two metal wires are woven and wound into the metal belt, the diameter of the metal belt is not increased greatly relative to the single metal wire, but the fracture resistance of the metal belt is greatly enhanced, and the strength of the compression-resistant layer is improved.

Drawings

FIG. 1 is a schematic diagram of the overall structure of an embodiment of the present application;

fig. 2 is a schematic cross-sectional structure diagram of an embodiment of the present application.

Reference numerals: 1. an inner core; 11. an electric power transmission line; 12. a signal line; 2. a shielding layer; 3. a mineral heat insulation layer; 4. a pressure resistant layer; 41. a metal strip; 42. polyester yarn; 5. a PP rope filling layer; 6. and (4) coating.

Detailed Description

The present application is described in further detail below with reference to figures 1-2.

The embodiment of the application discloses high temperature resistant mineral insulation fireproof cable. Referring to fig. 1 and 2, the high temperature resistant mineral insulation fireproof cable comprises an inner core 1, wherein the inner core 1 is sequentially coated with a shielding layer 2, a mineral heat insulation layer 3, a compression resistant layer 4 and a sheath 6 from inside to outside, and the compression resistant layer 4 is formed by weaving polyester yarns 42 with the diameter of 1.2mm and metal wires with the diameter of 0.15 mm.

Referring to fig. 1 and 2, the inner core 1 includes an electric power transmission line 11 and a plurality of signal lines 12, the plurality of signal lines 12 are distributed in a circumferential array on the periphery of the electric power transmission line 11, the periphery of the plurality of signal lines 12 is coated with a shielding layer 2, the shielding layer 2 is an aluminum foil layer, and a PP rope filling layer 5 is filled between the mineral thermal insulation layer 3 and the signal lines 12 and between the electric power transmission line 11.

The aluminum foil has a shielding effect on transmission of electric power, signals and the like in the cable, and the PP rope filling layer 5 enables the positions of transmission lines of the circuit, the signals and the like in the cable to be relatively fixed, so that the transmission performance of the cable is ensured.

Referring to fig. 1 and 2, a mineral heat insulation layer 3 is coated outside the shielding layer 2, the mineral heat insulation layer 3 is a magnesium oxide layer, and a compression-resistant layer 4 formed by weaving is coated outside the mineral heat insulation layer 3. The metal wires in the pressure-resistant layer 4 have a diameter of 0.15mm, and two metal wires are woven and wound to form the metal tape 41, and the metal tape 41 formed by winding and weaving has higher strength and better folding resistance than the metal wires having the same diameter. The metal tape 41 is wound around the outer circumference of the polyester yarn 42 having a diameter of 1.2mm, and then the polyester yarn 42 wound with the metal tape 41 is woven into the pressure-resistant layer 4.

The polyester yarns 42 are wound on the polyester yarns 42 and then the polyester yarns 42 are woven into the compression-resistant layer 4, so that the abrasion resistance of the compression-resistant layer 4 is ensured and enhanced, and the structural strength of the compression-resistant layer 4 is also ensured. Simultaneously, also can not make the resistance to compression layer 4 of weaving out too thick, and then avoided making the holistic diameter of cable too big, be unfavorable for the transportation also do not benefit to and lay.

Referring to fig. 1, the compression-resistant layer 4 is externally covered with an insulating sheath 6 made of rubber.

The implementation principle of the high-temperature-resistant mineral insulation fireproof cable in the embodiment of the application is as follows: mineral insulating layer 3 has the effect of fire-resistant protection, shielding layer 2 can prevent the signal interference that produces between the adjacent cable that lays, the 6 insulation protection constructors of crust, the resistance to compression layer 4 of being woven by dacron silk 42 and wire plays the guard action to shielding layer 2 and inner core 1, when the cable received wearing and tearing or extrusion, dacron silk 42 is wear-resisting, the wire is difficult for breaking, and weave itself and can strengthen being connected between dacron silk 42 and the wire, thereby promote the intensity on resistance to compression layer 4, avoid damaging the cable at the laying process as far as possible, influence the transmission of follow-up electric power and signal.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (8)

1. The utility model provides a high temperature resistant mineral insulation fireproof cable, includes inner core (1), its characterized in that: the inner core (1) is coated with a shielding layer (2), a mineral heat insulation layer (3), a pressure resistant layer (4) and a sheath (6) from inside to outside in sequence, and the pressure resistant layer (4) is a composite woven layer formed by polyester yarns (42) and metal wires.

2. The high temperature resistant mineral insulated fireproof cable of claim 1, wherein: the metal wires in the pressure-resistant layer (4) are 0.1-0.2 mm in diameter.

3. The high temperature resistant mineral insulated fireproof cable of claim 2, wherein: the metal wires in the pressure-resistant layer (4) are woven and wound every two wires to form a metal belt (41).

4. The high temperature resistant mineral insulated fireproof cable of claim 3, wherein: the diameter of the polyester yarn (42) in the pressure-resistant layer (4) is 1 mm.

5. The high temperature resistant mineral insulated fireproof cable of claim 4, wherein: the metal belt (41) is wound on the outer periphery side of the polyester yarn (42).

6. The high temperature resistant mineral insulated fireproof cable of claim 5, wherein: the mineral heat insulation layer (3) is a magnesium oxide layer, and the heat insulation layer is arranged on the inner side wall of the pressure resistant layer (4).

7. The high temperature resistant mineral insulated fireproof cable of claim 1, wherein: the shielding layer (2) is an aluminum foil layer.

8. The high temperature resistant mineral insulated fireproof cable of claim 7, wherein: the shielding layer (2) covers the outer peripheral side of the inner core (1), the inner core (1) comprises a power transmission line (11) and a signal line (12), and PP rope filling layers (5) are filled between the power transmission line (11) and the mineral heat insulation layer (3) and between the signal line (12) and the mineral heat insulation layer (3).

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