CN211929117U

CN211929117U - Fire-resistant mineral insulated cable

Info

Publication number: CN211929117U
Application number: CN202020238880.7U
Authority: CN
Inventors: 李静海; 吴素贤
Original assignee: Shenyang Shentong Wire And Cable Factory
Current assignee: Shenyang Shentong Wire And Cable Factory
Priority date: 2020-03-02
Filing date: 2020-03-02
Publication date: 2020-11-13
Anticipated expiration: 2030-03-02

Abstract

The utility model provides a fire-resistant mineral insulated cable, belonging to the technical field of special cables, comprising a plurality of conductor wire cores, a metal sleeve, an isolation sleeve, an oxygen isolation layer and an outer sheath, wherein the metal sleeve, the isolation sleeve, the oxygen isolation layer and the outer sheath are coated outside the conductor wire cores from inside to outside; the fireproof insulation layer also comprises a mineral insulation fireproof layer; the mineral insulation fire-resistant layer is arranged outside each conductor wire core and comprises an alkali-free glass fiber tape wrapped outside the conductor wire core and an inorganic insulation material filled between the alkali-free glass fiber tape and the conductor wire core. Optionally, the inorganic insulating material filled in the alkali-free glass fiber tape is magnesium oxide. Optionally, the conductor sinle silk is stranded or single copper post for stranded copper wire, the metal covering is copper sheathing or aluminium cover, has improved the physical and mechanical properties of cable, has changed the flame retardant coating in use and has received the not enough of mechanical action damage, has improved its fire resistance, and this cable can normally supply power in flame, starts fire extinguishing apparatus, reduces the fire loss.

Description

Fire-resistant mineral insulated cable

Technical Field

The utility model relates to the technical field of cables, especially a special cable with refractiveness.

Background

The cable has been widely used in shopping centers, high-rise buildings, airports, parking lots and other places. In the case of a fire, such as a shopping mall, a high-rise building, etc., where people are dense and the evacuation rate is slow, the evacuation time of the people in the building is difficult to determine to a large extent due to the slow response rate of the people in the building, and panic and confusion caused by delay and lack of power supply, for which reason the emergency line and the fire alarm prompt line become the most important lines in the fire and the integrity of the lines must be maintained in the fire. In the existing cable, the insulating layer is made of organic high polymer materials, so that the organic high polymer materials are easy to age and lose the insulating effect under the flame condition. Meanwhile, the existing cable guarantees that the fire resistance of the cable is reduced by arranging an insulating layer outside the conductor when the fire-resistant layer is slightly damaged.

SUMMERY OF THE UTILITY MODEL

To current mineral cable through set up the insulating layer in the conductor outside and guarantee its fire resistance can lead to the technical problem that the security performance of whole cable conductor descends when slight damage appears in the flame retardant coating, the utility model provides a fire-resistant mineral insulated cable.

In order to achieve the above object, the technical scheme of the utility model is, a fire-resistant mineral insulated cable, its characterized in that:

the insulation cable comprises a plurality of conductor wire cores, a metal sleeve, an isolation sleeve, an oxygen isolation layer and an outer sheath, wherein the metal sleeve, the isolation sleeve, the oxygen isolation layer and the outer sheath are coated outside the conductor wire cores from inside to outside; the fireproof insulation layer also comprises a mineral insulation fireproof layer; the mineral insulation fire-resistant layer is arranged outside each conductor wire core and comprises an alkali-free glass fiber tape wrapped outside the conductor wire core and an inorganic insulation material filled between the alkali-free glass fiber tape and the conductor wire core.

Optionally, the inorganic insulating material filled in the alkali-free glass fiber tape is magnesium oxide.

Optionally, the conductor wire core is formed by twisting a plurality of strands of copper wires or a single copper column, and the metal sleeve is a copper sleeve or an aluminum sleeve;

optionally, the alkali-free glass fiber tape is of a sheet structure, and the alkali-free glass fiber tape is wound outside the conductor core; or the alkali-free glass fiber tape is of a bag-shaped structure and is sleeved outside the conductor wire core.

Optionally, a filling layer is further disposed in the metal sleeve, and the filling layer is filled with a stepless insulating material.

Optionally, the alkali-free glass fiber belt is covered with an inner sheath made of polyvinyl chloride.

Optionally, the outer sheath is a halogen-free low-smoke cross-linked polyethylene insulation or polyethylene sheath.

Optionally, fire-resistant mineral insulated cable still includes the zero line core, the quantity of zero line core equals with the quantity of conductor core, and the insulating boot outside the zero line core is the cross-linked polyethylene insulation or the polyethylene sheath of halogen-free low smoke.

The mineral insulated cable with the structure is a metal sleeve which is coated outside a conductor wire core from inside to outside; and the mineral insulation fire-resistant layer without the alkali glass fiber tape is arranged between the metal sleeve and the conductor wire core, and the metal sleeve isolation sleeve, the oxygen isolation layer and the outer sheath are arranged, so that the physical and mechanical properties of the cable are improved, the defect that the fire-resistant layer is damaged by mechanical action in use is overcome, the fire-resistant property of the cable is improved, the cable can normally supply power in flame, the fire extinguishing equipment is started, and the fire loss is reduced.

Drawings

FIG. 1: the utility model provides a fire-resistant mineral insulated cable's first embodiment's cross-sectional view.

FIG. 2: the utility model provides a fire-resistant mineral insulated cable's second kind embodiment's cross-sectional view.

In the figure, 1 is a conductor wire core, 21 is a metal sleeve, 22 is an isolation sleeve, 23 is an oxygen isolation layer, 24 is an outer sheath, 31 is an alkali-free glass fiber tape, 32 is a synthetic adhesive layer, 33 is an inner sheath, 4 is a filling layer, 5 is a zero wire core, and 51 is an insulation sleeve.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

First embodiment

Fig. 1 is a schematic cross-sectional view of a first embodiment of a fire-resistant mineral-insulated cable according to the present invention. The utility model provides a fire-resistant mineral insulated cable, which comprises a plurality of conductor wire cores 1, a metal sleeve 21, an isolation sleeve 22, an oxygen isolation layer 23 and an outer sheath 24, wherein the metal sleeve is coated outside the conductor wire cores from inside to outside; still be provided with filling layer 4 in the metal covering 21 the filling layer fills the stepless insulating material, oversheath 24 is the insulating or polyethylene sheath of the cross-linked polyethylene of zero halogen low smoke.

The fireproof insulation layer also comprises a mineral insulation fireproof layer; the mineral insulation fire-resistant layer is arranged outside each conductor wire core 1, the mineral insulation fire-resistant layer comprises an alkali-free glass fiber tape 31 wrapping the conductor wire core 1 and an inorganic insulation material 32 filled between the alkali-free glass fiber tape and the conductor wire core, the alkali-free glass fiber tape 31 is of a sheet structure, the alkali-free glass fiber tape 31 is wound outside the conductor wire core 1, or the alkali-free glass fiber tape 31 is of a bag-shaped structure, the alkali-free glass fiber tape 31 is sleeved outside the conductor wire core 1, and an inner sheath 33 made of polyvinyl chloride covers the alkali-free glass fiber tape 31. The inorganic insulating material filled in the alkali-free glass fiber tape 31 is magnesium oxide, the conductor core 1 is a stranded copper wire or a single copper column, and the metal sleeve 21 is a copper sleeve or an aluminum sheath.

Second embodiment

Fig. 2 is a schematic cross-sectional view of a second embodiment of a fire resistant mineral insulated cable according to the present invention.

As shown in the figure, fire-resistant mineral insulated cable still includes zero line core 5, the quantity of zero line core equals with the quantity of conductor sinle silk, and insulating cover 51 outside zero line core 5 is the cross-linked polyethylene insulation or the polyethylene sheath of halogen-free low smoke, and other structures are the same with first implementation mode, no longer describe.

The working principle is as follows: the mineral insulated cable comprises a plurality of conductor wire cores 1, a metal sleeve 21, an isolation sleeve 22, an oxygen isolation layer 23 and an outer sheath 24, wherein the metal sleeve 21, the isolation sleeve 22, the oxygen isolation layer 23 and the outer sheath are coated outside the conductor wire cores from inside to outside; the fireproof insulation layer also comprises a mineral insulation fireproof layer; the mineral insulation fire-resistant layer is arranged outside each conductor wire core 1, comprises an alkali-free glass fiber tape 31 wrapping the conductor wire core 1 and an inorganic insulation material 32 filled between the alkali-free glass fiber tape and the conductor wire core, and has fire resistance. Meanwhile, the novel mineral cable is provided with the isolating sleeve 22, the oxygen isolating layer 23 and the outer sheath 24 outside the metal sleeve, so that the protection of the metal sleeve is improved, the physical and mechanical properties of the cable are improved, and the problem that the safety performance of the whole cable is reduced when the cable is slightly damaged is solved.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims

1. A fire resistant mineral insulated cable characterized by:

comprises a plurality of conductor wire cores (1), a metal sleeve (21) which is coated outside the conductor wire cores from inside to outside, an isolation sleeve (22), an oxygen isolation layer (23) and an outer sheath (24);

the fireproof insulation layer also comprises a mineral insulation fireproof layer;

the mineral insulation fire-resistant layer is arranged outside each conductor wire core (1), and comprises an alkali-free glass fiber tape (31) wrapping the conductor wire cores (1) and an inorganic insulation material (32) filled between the alkali-free glass fiber tape and the conductor wire cores.

2. Fire-resistant mineral-insulated cable according to claim 1, characterized in that: the inorganic insulating material filled in the alkali-free glass fiber tape (31) is magnesium oxide.

3. Fire-resistant mineral-insulated cable according to claim 1, characterized in that: the conductor wire core (1) is formed by twisting a plurality of strands of copper wires or a single copper column, and the metal sleeve (21) is a copper sleeve or an aluminum sleeve.

4. Fire-resistant mineral-insulated cable according to claim 1, characterized in that: the alkali-free glass fiber tape (31) is of a sheet structure, and the alkali-free glass fiber tape (31) is wound outside the conductor wire core (1).

5. Fire-resistant mineral-insulated cable according to claim 1, characterized in that: the alkali-free glass fiber tape (31) is of a bag-shaped structure, and the alkali-free glass fiber tape (31) is sleeved outside the conductor wire core (1).

6. Fire-resistant mineral-insulated cable according to claim 1, characterized in that: the alkali-free glass fiber belt (31) is covered with an inner sheath (33) made of polyvinyl chloride.

7. Fire-resistant mineral-insulated cable according to claim 1, characterized in that: the outer sheath (24) is a halogen-free low-smoke cross-linked polyethylene insulation or polyethylene sheath.

8. Fire resistant mineral insulated cable according to any of claims 1 to 7, characterized in that: still include zero line core (5), the quantity of zero line core (5) equals with the quantity of conductor sinle silk (1), and insulating cover (51) outside zero line core (5) are the cross-linked polyethylene of zero halogen low smoke and insulate or the polyethylene sheath.