CN214796808U - Fire-resistant cable - Google Patents

Abstract

The utility model provides a fire-resistant cable, which comprises a plurality of wire cores and an intermediate body; the wire core comprises a conductor, and a first semi-conductive shielding layer, an insulating layer, a second semi-conductive shielding layer and a copper shielding layer which are wrapped on the conductor from inside to outside; the outer wall of the first semi-conductive shielding layer is provided with a raised trapezoidal bump; the intermediate body is provided with a plurality of clamping grooves for clamping the wire cores, and a structure formed by the clamped wire cores is sequentially wrapped with a composite layer, an oxygen barrier layer, a protective layer, an armor layer, a fireproof layer and a sheath; and filling layers are arranged in gaps among the wire core, the intermediate body and the composite layer. Through the setting, the problem that the effect of its sinle silk of medium voltage fire resisting cable protection is not good has been solved to this scheme, and then has improved the fire prevention effect of cable.

Description

Fire-resistant cable

Technical Field

The utility model relates to the technical field of cable, in particular to fire resisting cable.

Background

Wire and cable refers to materials used for power, communication and related transmission applications. Power cables are generally rope-like cables made up of several or groups of conductors twisted together, each group being insulated from the other and generally twisted around a center, the entire outer surface being coated with a high-performance insulating layer. With the technological progress and the process of urbanization, medium-voltage distribution systems in important places such as a plurality of extra-large towns, high-rise buildings, subways, power plants, nuclear power stations, tunnels and the like emerge throughout the country, higher requirements are put forward on the safety under the condition of cable fire, and the requirements of people on building fire prevention and electrical fire prevention are increasingly improved.

The medium-voltage cable occupies an important position in a power system, usually supplies power for a plurality of systems and terminals, and the medium-voltage cable is laid by sharing a laying channel with other cables, so that in case of fire, the power supply requirements of multiple departments are influenced, and the normal production and life are seriously influenced, therefore, the medium-voltage fire-resistant cable is produced at the same time, and the requirements of various industries on the medium-voltage fire-resistant cable are continuously increased. Because the medium-voltage cable is high in voltage level, a semi-conducting layer for homogenizing an electric field is required outside a conductor, and therefore a production process of co-extruding an inner shield, an insulating layer and an outer shield is generally adopted in the production process, so that the fireproof layer cannot be coated outside the conductor.

The conventional medium-voltage fire-resistant cable mainly adopts the technical scheme that tapes such as mica tapes and silica gel tapes are wrapped outside the cable core, and the cable has poor cable protection effect, so that the fireproof effect is poor.

SUMMERY OF THE UTILITY MODEL

The utility model provides a fire resisting cable solves the current problem that its sinle silk effect is not good of middling pressure fire resisting cable protection to the fire prevention effect of cable has been improved.

In order to achieve the purpose of the invention, the utility model adopts the technical scheme that:

providing a fire resistant cable comprising a plurality of cores and an intermediate;

the wire core comprises a conductor, and a first semi-conductive shielding layer, an insulating layer, a second semi-conductive shielding layer and a copper shielding layer which are wrapped on the conductor from inside to outside;

the outer wall of the first semi-conductive shielding layer is provided with a raised trapezoidal bump;

the intermediate body is provided with a plurality of clamping grooves for clamping the wire cores, and a structure formed by the plurality of wire cores clamped by the intermediate body is sequentially wrapped with a composite layer, an oxygen barrier layer, a protective layer, an armor layer, a fireproof layer and a sheath; the depth of the clamping groove is one half to two thirds of the radius of the wire core;

and filling layers are arranged in gaps among the wire core, the intermediate body and the composite layer.

The utility model has the advantages that:

the first semi-conductive shielding layer and the insulating layer arranged in the scheme can effectively reduce the phenomena of uneven current distribution and reduced current carrying capacity of the conductor due to the skin effect, and improve the effective use area of the cable conductor, thereby improving the current carrying capacity of the cable.

The arrangement of the trapezoidal bumps on the outer wall of the first semi-conductive shielding layer can enable the insulating layer to be better arranged on the first semi-conductive shielding layer, and the capacity of the cable for bearing high voltage is enhanced. The second semi-conductive shielding layer improves the electrical property and the mechanical and physical properties of the wire core, and simultaneously can also improve the high temperature resistance of the wire core.

The copper shielding layer improves the electrical property and the anti-deformation capability of the wire core. The filling layer avoids abrasion among the wire core, the intermediate body and the composite layer. The intermediate body avoids direct abrasion between the wire cores, the clamping groove on the intermediate body is convenient for fixing the wire cores on the intermediate body, the composite layer is convenient to wind, and meanwhile, the filling layer is prevented from being inconveniently filled in a closed area enclosed by the wire cores.

The oxygen isolation layer and the protective layer can effectively isolate the effects of external flame and high temperature. The armor layer improves the impact strength of the cable. The fire-resistant layer may enhance the fire-resistance and fire-rating of the overall cable.

Further, the conductor is formed by twisting the single wires of the conductor.

Further, the flame retardant coating is a ceramic silica gel layer.

Furthermore, the filling layer is formed by weaving a plurality of flame-retardant filling strips.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

The technical solution of the present invention is further described in detail by the accompanying drawings and examples.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic structural view of a cross section of a fire resistant cable.

Wherein: 1. a conductor; 2. a first semiconducting shield layer; 3. an insulating layer; 4. a second semiconductive shield layer; 5. a copper shield layer; 6. compounding layers; 7. an oxygen barrier layer; 8. a protective layer; 9. an armor layer; 10. a fire barrier layer; 11. a sheath; 12 trapezoidal bumps; 13. a filling layer; 14. an intermediate.

Detailed Description

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are presented herein only to illustrate and explain the present invention, and not to limit the present invention.

Referring to fig. 1, the present scheme provides a fire resistant cable comprising a plurality of cores and an intermediate 14;

the wire core comprises a conductor 1, and a first semi-conductive shielding layer 2, an insulating layer 3, a second semi-conductive shielding layer 4 and a copper shielding layer 5 which are wrapped on the conductor 1 from inside to outside;

the outer wall of the first semi-conductive shielding layer 2 is provided with a raised trapezoidal bump 12;

the intermediate 14 is provided with a plurality of clamping grooves for clamping the wire cores, and the structure formed by wrapping the wire cores clamped by the intermediate 14 is sequentially wrapped with a composite layer 6, an oxygen barrier layer 7, a protective layer 8, an armor layer 9, a fire-proof layer 10 and a sheath 11; the degree of depth of draw-in groove is sinle silk radial half to two-thirds, is convenient for with the sinle silk centre gripping in the draw-in groove, and the compound layer 6 is more conveniently wrapped up to many sinle silks after the centre gripping.

And a filling layer 13 is arranged in the gap between the wire core, the intermediate body 14 and the composite layer 6.

The first semi-conductive shielding layer 2 and the insulating layer 3 which are arranged in the scheme effectively reduce the phenomena of uneven current distribution and reduced current carrying capacity of the conductor 1 caused by the skin effect, and improve the effective use area of the cable conductor 1, thereby improving the current carrying capacity of the cable.

The arrangement of the trapezoidal bump 12 on the outer wall of the first semiconductive shielding layer 2 can make the insulating layer 3 be better arranged on the first semiconductive shielding layer 2, and the capability of the cable for bearing high voltage is enhanced. The second semi-conductive shielding layer 4 improves the electrical property and the mechanical and physical properties of the wire core, and can also improve the high temperature resistance of the wire core.

The copper shielding layer 5 improves the electrical property and the deformation resistance of the wire core. The filling layer 13 avoids abrasion between the wire core, the intermediate 14 and the composite layer 6. The intermediate body 14 avoids direct abrasion among the wire cores, the clamping groove on the intermediate body is convenient for fixing the wire cores on the intermediate body 14, the composite layer 6 is convenient to wind, and meanwhile, the filling layer 13 is prevented from being inconveniently filled in the closed area surrounded by the wire cores.

The oxygen-isolating layer 7 and the protective layer 8 can effectively isolate the effects of external flame and high temperature. The armor layer 9 improves the impact strength of the cable. The fire-blocking layer 10 may enhance the fire-blocking and fire-rating of the overall cable.

During the implementation, the preferred filling layer 13 of this scheme is woven for many filler strips and forms, fills like this between sinle silk, midbody 14, composite bed 6, has avoided wearing and tearing between the three. The intermediate body 14 avoids direct abrasion among the wire cores, the clamping groove on the intermediate body 14 facilitates the wire cores to be fixed on the intermediate body 14, the composite layer 6 to be wound conveniently, and meanwhile, the filling layer 13 is prevented from being inconveniently filled in the closed area surrounded by the wire cores. The arrangement of the trapezoidal bump 12 can enable the insulating layer 3 to be better extruded on the first semiconductive shielding layer 2, and the capacity of the cable for bearing high voltage is enhanced.

In the specific implementation, the conductor 1 is a copper wire, and the copper wire is formed by twisting single wires to form a solid copper wire. The first semiconductive shield layer 2 is a cross-linked semiconductive shield layer and uniformly covers the conductor 1. The insulating layer 3 is a cross-linked polyethylene insulating layer, the insulating layer 3 is tightly extruded on the first semiconducting shielding layer 2, and the groove is formed by extruding the insulating layer 3 on the lug of the first semiconducting shielding layer 2, so that the insulating layer 3 can be better coated on the first semiconducting shielding layer 2. The cross-linked polyethylene insulating layer has stronger electrical property and mechanical physical property capability and high temperature resistance. The copper shielding layer 5 is made of annealed soft copper; according to the characteristics of copper, the copper shielding layer 5 has stronger electrical property and anti-interference capability.

The composite layer 6 is a laminated mica tape and an alkali-free glass tape, and the composite layer 6 has strong flame retardant, high temperature resistance, halogen-free, smoke-free and fireproof functions; according to the performances of the glass fiber tape and the mica tape, the composite layer 6 has stronger flame retardance, high temperature resistance, halogen free, smoke free and fireproof performances. The oxygen-isolating layer 7 is a ceramic polyolefin oxygen-isolating layer; the protective layer 8 is a laminated alkali-free glass tape and non-woven fabric; the ceramic polyolefin oxygen-isolating layer can be sintered into a hard protective layer 8 at high temperature, thereby playing the role of effectively isolating external flame and high temperature.

The armor layer 9 is made of galvanized steel and is used for improving the impact strength of the cable and protecting the cable from impact or vibration in a fire scene. The fireproof layer 10 is a ceramic silica gel layer; the fireproof performance and the fire-resistant grade of the cable are improved, the ceramic silica gel belt can be sintered into the hard protective layer 8 at high temperature, so that the effect of effectively isolating external flame and high temperature is achieved, the double-layer fireproof function is achieved by matching with the oxygen isolation layer 7, and the fireproof performance of the whole cable is more superior. The jacket 11 is a polyolefin jacket. According to the characteristics, the polyolefin sheath has stronger electrical property, low halogen, low smoke, salt mist resistance, mildew resistance and the like.

The filling layer 13 is formed by filling a plurality of flame-retardant filling strips between the wire core and the composite layer 6; the filler strip has a waterproof function, and the waterproof capability of the cable is enhanced.

To sum up, the cable that this scheme provided has high temperature resistant, fire prevention, fire-retardant effect, simultaneously, can also avoid the conflagration that arouses because of the short circuit, makes this cable have fire behavior to a certain extent, and then has protected the sinle silk of cable, improves the fire behavior of cable.

It will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (4)

1. A fire resistant cable comprising a plurality of cores and an intermediate;

the wire core comprises a conductor, and a first semi-conductive shielding layer, an insulating layer, a second semi-conductive shielding layer and a copper shielding layer which are wrapped on the conductor from inside to outside;

the outer wall of the first semi-conductive shielding layer is provided with a raised trapezoidal bump;

the intermediate body is provided with a plurality of clamping grooves for clamping the wire cores, and a structure formed by clamping the plurality of wire cores by the intermediate body is sequentially wrapped with a composite layer, an oxygen barrier layer, a protective layer, an armor layer, a fireproof layer and a sheath;

the depth of the clamping groove is one half to two thirds of the radius of the wire core;

and filling layers are arranged in gaps among the wire core, the intermediate body and the composite layer.

2. The fire resistant cable of claim 1 wherein said conductor is formed from a twisted array of monofilaments.

3. The fire resistant cable of claim 1 wherein the fire resistant layer is a silica ceramic layer.

4. The fire resistant cable of claim 1 wherein said filler layer is woven from a plurality of fire resistant filler strips.

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