CN213092881U - Low-smoke halogen-free fire-resistant cable - Google Patents

Abstract

The application relates to a low-smoke halogen-free fire-resistant cable, which relates to the technical field of cables and comprises an outer layer sheath and a plurality of inner cores arranged in the outer layer sheath; a halogen-free low-smoke flame-retardant sheath is arranged on the inner side wall of the outer sheath; the mica fireproof layer is arranged on the outer side of the inner cores and separates the adjacent inner cores from each other, accommodating cavities which are circumferentially distributed are formed around the mica fireproof layer, and the inner cores are respectively positioned in the corresponding accommodating cavities; it has the oxygen layer that separates to hold the intracavity packing, and smog is less when this application has the burning, the effect of fire resistance preferred.

Description

Low-smoke halogen-free fire-resistant cable

Technical Field

The application relates to the technical field of cables, in particular to a low-smoke halogen-free fire-resistant cable.

Background

At present, cables are a general term for optical cables, electric cables and the like. The cable has many purposes, is mainly used for controlling installation, connecting equipment, transmitting power and other multiple functions, and is a common and indispensable object in daily life. Installation requires special care since the cable is live.

In the related art, the application of the environment-friendly fire-fighting power cable in the fields of modern industry and civil power cables is more and more emphasized, and how to enable the cable to be flame-retardant, less in smoke and free of halogen gas release in a high-temperature environment is a popular research subject in the power cable industry at present. The commonly used cable material, the insulating layer and the sheath thereof have low temperature resistance, generally only up to 70 ℃, and once the cable material is burnt, a large amount of smoke and halogen gas are the main reasons for suffocation of people.

In view of the above-mentioned related technologies, the inventor believes that the cable has the defects of large smoke and poor fire resistance when burning.

SUMMERY OF THE UTILITY MODEL

To the not enough of prior art existence, the application provides a low smoke and zero halogen fire resistant cable, smog is less when having the burning, the effect of fire resistance preferred.

The technical purpose of the application is realized by the following technical scheme:

a low-smoke halogen-free fire-resistant cable comprises an outer layer sheath and a plurality of inner cores arranged in the outer layer sheath; a halogen-free low-smoke flame-retardant sheath is arranged on the inner side wall of the outer sheath; the mica fireproof layer is arranged on the outer side of the inner cores and separates the adjacent inner cores from each other, accommodating cavities which are circumferentially distributed are formed around the mica fireproof layer, and the inner cores are respectively positioned in the corresponding accommodating cavities; the accommodating cavity is filled with an oxygen isolation layer.

By adopting the technical scheme, the mica fire-resistant layer has good insulation, high temperature resistance and heat insulation effects, and can protect the interior of the cable from being influenced by external high temperature within a certain time when a fire disaster occurs, so that the adverse influence of the fire disaster on the cable can be delayed; the halogen-free low-smoke flame-retardant sheath does not contain halogen, and the amount of smoke released during combustion is less, so that the harm of the smoke to the human health can be greatly reduced; the containing cavities formed by the mica refractory layers can enable the inner cores to be positioned in relatively independent spaces, so that mutual interference among the inner cores can be reduced, and a relatively stable environment is provided for the inner cores; the oxygen isolating layer is mainly made of aluminum hydroxide material, and can release crystal water under the condition of high temperature, so that the ambient temperature can be reduced, and the purposes of fire isolation and even fire prevention can be achieved.

The application is further configured to: be provided with the spacing strip that extends along self length direction on the mica flame retardant coating lateral wall, be provided with the spacing groove of opening towards spacing strip on the outer sheath inside wall, spacing strip inserts at the spacing inslot.

By adopting the technical scheme, the limiting strip inserted into the limiting groove can further increase the contact area between the side wall of the mica fire-resistant layer and the side wall of the outer-layer sheath, so that the fire resistance of the mica fire-resistant layer can be further enhanced; simultaneously, the spacing groove and the spacing strip are mutually inserted, so that the mica fireproof layer can be limited, and the stability of the mica fireproof layer is improved.

The application is further configured to: and a glass fiber layer is arranged between the halogen-free low-smoke flame-retardant sheath and the outer sheath, and is arranged in a corrugated manner.

By adopting the technical scheme, the glass fiber layer is an inorganic non-metallic material with excellent performance and has the characteristics of good insulating property, strong heat resistance, good corrosion resistance and high mechanical strength; can also strengthen the anti bending performance of cable through the glass fiber layer, the glass fiber layer that is the corrugated setting can also increase the area of contact of both sides, improves the firm nature of junction.

The application is further configured to: and a waterproof layer is arranged between the glass fiber layer and the outer sheath.

Through adopting above-mentioned technical scheme, inside the water barrier layer can effectively the outside liquid of separation flow into outer sheath to can play the water proof effect of preferred to outer sheath inside.

The application is further configured to: the outer side of the inner core is wrapped with a polyethylene insulating layer.

By adopting the technical scheme, the polyethylene insulating layer has better low-temperature resistance, good chemical property and resistance to most of acid and alkali erosion, and can play a better protection role on the inner core inside through the polyethylene insulating layer.

The application is further configured to: the outer side wall of the polyethylene insulating layer is provided with extension blocks which are circumferentially arranged in a surrounding manner, and the extension blocks are embedded into the oxygen isolation layer.

Through adopting above-mentioned technical scheme, the contact area between extension piece ability increase polyethylene insulating layer lateral wall and the oxygen layer that separates to enable ethylene insulating layer more stable firm fixing in the oxygen layer that separates.

The application is further configured to: and the outer side of the ethylene insulating layer is wrapped with a metal shielding layer.

By adopting the technical scheme, the metal shielding layer can reduce the adverse effect of an external electromagnetic field on the inner core, and can shield the external electromagnetic field, so that the anti-interference capability of the inner core can be enhanced.

The application is further configured to: and a plurality of partition plates positioned in the oxygen isolation layer are formed on the mica fire-resistant layer, and the partition plates are symmetrically arranged on two sides of the inner core.

Through adopting above-mentioned technical scheme, thereby can further strengthen the fire behavior of mica flame retardant coating to the inner core both sides through setting up multilayer baffle, slow down the transmission speed of external heat source, improve the holistic fire resistance of cable.

To sum up, the beneficial effect of this application is:

1. when a fire disaster happens, the mica fire-resistant layer can protect the interior of the cable from being influenced by external high temperature within a certain time, so that the adverse influence of the fire disaster on the cable can be delayed; the halogen-free low-smoke flame-retardant sheath does not contain halogen, and the amount of smoke released during combustion is less, so that the harm of the smoke to the human health can be greatly reduced;

2. the glass fiber layer can play a better role in insulation, heat resistance and corrosion resistance protection for the inner core.

Drawings

FIG. 1 is a schematic cross-sectional view of the overall structure of the present application;

FIG. 2 is a schematic sectional view of a portion of the structure of the mica refractory layer after the oxygen barrier layer is hidden;

fig. 3 is a schematic partial structural cross-sectional view of the present application highlighting the core.

Reference numerals: 1. an outer sheath; 11. a limiting groove; 2. an inner core; 3. a halogen-free low-smoke flame-retardant sheath; 4. a mica refractory layer; 41. an accommodating chamber; 42. a limiting strip; 43. a partition plate; 5. an oxygen barrier layer; 6. a glass fiber layer; 7. a water barrier layer; 8. an ethylene insulating layer; 81. an extension block; 9. and a metal shielding layer.

Detailed Description

The present application is described in further detail below with reference to figures 1-3.

The embodiment of the application discloses a low-smoke halogen-free fire-resistant cable, as shown in fig. 1 and 2, which comprises an outer sheath 1 positioned at the outermost layer and three groups of inner cores 2 positioned inside the outer sheath 1. The outer sheath 1 is made of polyethylene material, and has excellent electrical insulation performance and good processing performance. The outer sheath 1 is also provided with a water-resisting layer 7, a glass fiber layer 6, a halogen-free low-smoke flame-retardant sheath 3 and a mica flame-retardant layer 4 from outside to inside in sequence. The mica flame retardant coating 4 separates the three groups of inner cores 2 from each other, and when a fire disaster occurs, the mica flame retardant coating 4 can protect the inner cores 2 from being influenced by external high temperature within a certain time, so that the adverse effect of the fire disaster on the cable can be delayed.

As shown in fig. 1 and 2, the outer ring of the mica refractory layer 4 is circular, three accommodating cavities 41 with equal areas are separated from the interior of the mica refractory layer 4, the three accommodating cavities 41 are mutually independent, and the accommodating cavities 41 are circumferentially distributed around the mica refractory layer at uniform intervals. Three limiting strips 42 extending along the length direction of the mica fireproof layer 4 are formed on the outer side wall of the mica fireproof layer at intervals in the circumferential direction, three openings are formed in the inner side wall of the outer sheath 1 and face the limiting grooves 11 corresponding to the limiting strips 42 respectively, and the limiting strips 42 are inserted into the respective opposite limiting grooves 11. The three inner cores 2 are respectively positioned in the corresponding accommodating cavities 41, the accommodating cavities 41 are filled with the oxygen isolating layers 5, the oxygen isolating layers 5 are mainly made of aluminum hydroxide materials, and can release crystal water under the condition of high temperature, so that the surrounding temperature can be reduced, and the purposes of fire isolation and even fire prevention can be achieved.

As shown in fig. 1 and 2, four partition plates 43 are formed on the mica refractory layer 4 and located in the accommodating chamber 41, and the partition plates 43 partition the oxygen barrier layer 5 located in the accommodating chamber 41. The partition boards 43 are arranged in pairs and symmetrically arranged on two sides of the inner core 2.

As shown in fig. 1 and 3, the outer side of the inner core 2 is further wrapped by the polyethylene insulation layer 8, four extension blocks 81 are formed on the outer side wall of the polyethylene insulation layer 8 and surround the outer side wall at uniform intervals in the circumferential direction, the extension blocks 81 extend along the length direction of the inner core 2, and the extension blocks 81 are embedded in the oxygen barrier layer 5. The outer side wall of the polyethylene insulating layer 8 is fixedly wound with a metal shielding layer 9, and the metal shielding layer 9 can shield an external electromagnetic field, so that the anti-interference capability of the inner core 2 can be enhanced.

As shown in fig. 1, the glass fiber layer 6 between the halogen-free low-smoke flame-retardant sheath 3 and the water-resisting layer 7 is arranged in a corrugated shape, the glass fiber layer 6 has the characteristics of good insulating property, strong heat resistance, good corrosion resistance and high mechanical strength, and the corrugated glass fiber layer 6 can increase the contact area of the joints at two sides and improve the firmness of the joints.

The specific effects of the embodiment are as follows:

the mica fire-resistant layer 4 has good insulating, high temperature resistant, thermal-insulated effect, and when taking place conflagration mica fire-resistant layer 4 can protect the inside influence that does not receive outside high temperature of cable in certain time, and then can delay the harmful effects that the conflagration caused the cable. The halogen-free low-smoke flame-retardant sheath 3 does not contain halogen, and the amount of smoke released during combustion is less, so that the harm of the smoke to the human health can be greatly reduced. The containing cavities 41 formed by the mica fire-resistant layers 4 can enable the inner cores 2 to be in relatively independent spaces, so that mutual interference among the inner cores 2 can be reduced, and a relatively stable environment is provided for the inner cores. The oxygen-insulating layer 5 filled in the accommodating cavity 41 can release crystal water under the condition of high temperature, so that the ambient temperature can be reduced, and the purposes of fire insulation and even fire prevention can be achieved.

The embodiments of the present invention are preferred embodiments of the present application, and the scope of protection of the present application is not limited by the 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. A low-smoke halogen-free fire-resistant cable comprises an outer layer sheath (1) and a plurality of inner cores (2) arranged in the outer layer sheath (1); the method is characterized in that: a halogen-free low-smoke flame-retardant sheath (3) is arranged on the inner side wall of the outer sheath (1); the mica fireproof layer (4) is arranged on the outer side of the inner cores (2), the mica fireproof layer (4) separates the adjacent inner cores (2), accommodating cavities (41) which are circumferentially distributed are formed around the mica fireproof layer (4), and the inner cores (2) are respectively positioned in the corresponding accommodating cavities (41); the accommodating cavity (41) is filled with an oxygen isolation layer (5).

2. A low smoke, zero halogen and fire resistant cable as claimed in claim 1, characterized in that: be provided with spacing (42) that extend along self length direction on mica flame retardant coating (4) lateral wall, be provided with spacing groove (11) of opening towards spacing (42) on outer sheath (1) inside wall, spacing (42) insert in spacing groove (11).

3. A low smoke, zero halogen and fire resistant cable according to claim 2, characterized in that: a glass fiber layer (6) is arranged between the halogen-free low-smoke flame-retardant sheath (3) and the outer sheath (1), and the glass fiber layer (6) is arranged in a corrugated manner.

4. A low smoke, zero halogen and fire resistant cable according to claim 3, characterized in that: and a waterproof layer (7) is arranged between the glass fiber layer (6) and the outer sheath (1).

5. A low smoke, zero halogen and fire resistant cable as claimed in claim 1, characterized in that: the outer side of the inner core (2) is wrapped with a polyethylene insulating layer (8).

6. A low smoke, zero halogen and fire resistant cable as claimed in claim 5, characterized in that: the outer side wall of the polyethylene insulating layer (8) is provided with an extension block (81) which is circumferentially arranged in a surrounding manner, and the extension block (81) is embedded into the oxygen isolation layer (5).

7. A low smoke, zero halogen and fire resistant cable as claimed in claim 5, characterized in that: and the outer side of the ethylene insulating layer (8) is wrapped with a metal shielding layer (9).

8. A low smoke, zero halogen and fire resistant cable according to claim 6, characterized in that: a plurality of partition plates (43) positioned in the oxygen isolation layer (5) are formed on the mica fire-resistant layer (4), and the partition plates (43) are symmetrically arranged on two sides of the inner core (2).

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