CN210429374U - Low-smoke halogen-free flame-retardant flexible fireproof cable - Google Patents

Abstract

The utility model provides a low-smoke halogen-free flame-retardant flexible fireproof cable, which comprises an outer sheath layer, an inner sheath and a cable core, wherein a plurality of conductor cores are arranged inside the cable core, each conductor core comprises a tinned copper wire, an insulating layer and a shielding layer, a first filling layer is arranged between the insulating layer and the copper wire, a second filling layer is arranged between the shielding layer and the inner sheath, the cross section of the inner sheath is circular, a third filling layer and a square sheath are sequentially coated outside the inner sheath, the fourth filling layer, around covering, fire-retardant protective layer and oversheath layer, be provided with the axial kerve on the lateral surface of fire-retardant protective layer, four corners of square cover use the fillet transition and be provided with the arch that the cross-section is spindle-shaped in the side, and every corner both sides of square cover are provided with one and resist the brace, and the cross sectional shape of brace is triangle-shaped and is provided with a steel wire at its geometric center. The utility model discloses intensity is higher relatively, and effective long service life, anti ductility, anti-interference effect and fire resistance are good moreover.

Description

Low-smoke halogen-free flame-retardant flexible fireproof cable

Technical Field

The utility model belongs to the technical field of power cable, especially, relate to a fire-retardant flexible fireproof cable of low smoke and zero halogen.

Background

The low-smoke halogen-free cable is an environment-friendly cable which is made of rubber materials without halogen (F, Cl, Br, I, At), lead, cadmium, chromium, mercury and other environmental substances and does not emit toxic smoke during combustion. With the development of science and technology, the energy power generation technology is continuously improved, and various power transportation carriers are generated and continuously developed to meet the power supply requirements of various devices in various occasions. The cable is mainly applied to strong electric energy transmission in a power supply line and has a wide application range. As the application amount of the cable increases, the environmental occasions to which the cable is exposed are more and more complex, and meanwhile, higher requirements are put on the performance of the cable.

The existing cable mainly comprises 4 parts, namely a conductor core, an insulating layer, an inner sheath, a flame-retardant layer or a flame-retardant layer and an outer sheath layer. Most cables are good in flexibility, but lack certain strength, so that the difficulty of laying or erecting is increased; secondly, the conductor core inside the cable is generally formed by twisting copper or aluminum wires, so that the elongation resistance is poor, and certain influence is exerted on the service life and the connection reliability of the cable.

SUMMERY OF THE UTILITY MODEL

The utility model discloses there is the relatively poor technical problem of intensity low and anti extensibility to above-mentioned cable, provides a reasonable in design, simple structure, intensity height and the better anti-interference flame retarded cable of anti extensibility.

In order to achieve the above purpose, the technical solution adopted by the present invention is that, the present invention provides a low smoke zero halogen flame retardant flexible fireproof cable, which comprises an outer sheath layer, a flame retardant protective layer, a wrapping layer, an inner sheath, a filling layer and a cable core, wherein a plurality of conductor cores are arranged inside the cable core, a plurality of axial pull grooves are evenly arranged on the outer side surface of the flame retardant protective layer, each conductor core comprises three twisted tinned copper wires, and an insulating layer and a shielding layer which are coated outside the three copper wires, a first filling layer is arranged between the insulating layer and the copper wires, a second filling layer is arranged between the shielding layer and the inner sheath, the inner sheath is circular in cross-sectional shape and made of a flame retardant polyolefin material, a third filling layer, a square sheath, a fourth filling layer, the wrapping layer, the flame retardant protective layer and the outer sheath layer are sequentially coated outside the inner sheath, four corners of the square sleeve are in round corner transition, a protrusion with a spindle-shaped cross section is arranged on each side face of the square sleeve, a counter brace is arranged on each of two sides of each corner of the square sleeve, the cross section of each counter brace is circular, and a steel wire is arranged at the geometric center of each counter brace.

Preferably, the cable core comprises four conductor cores which are symmetrically arranged in pairs, and each conductor core is opposite to one corner of the square sleeve.

Preferably, the anti-ribbing is made of a flame retardant polyolefin material.

Compared with the prior art, the utility model discloses an advantage lies in with positive effect:

the utility model provides a low smoke and zero halogen fire-retardant flexible fireproof cable, can improve the intensity of cable through increasing square cover, reduced the degree of difficulty of laying and setting up the cable, and increased the axial kerve and improved the fatigue limit of cable; utilize anti brace and steel wire in order improving the anti ductility of cable, in addition the structure of the stranded of the conductor core and cable core, effectively prolonged the life of cable. The utility model relates to a rationally, simple structure, anti-interference and shielding are effectual, are fit for extensive the popularization.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.

Fig. 1 is a schematic structural diagram of a low-smoke halogen-free flame-retardant flexible fireproof cable provided by an embodiment;

in the above figures, 1, an outer sheath layer; 2. a flame retardant protective layer; 21. axially drawing a groove; 3. wrapping a covering; 4. an inner sheath; 5. a filling layer; 51. a first filling layer; 52. a second filling layer; 53. a third filling layer; 54. a fourth filling layer; 6. a cable core; 61. a conductor core; 611. tinning copper wires; 612. an insulating layer; 613. a shielding layer; 7. a square sleeve; 71. a protrusion; 8. anti-bracing; 9. a steel wire.

Detailed Description

In order to make the above objects, features and advantages of the present invention more clearly understood, the present invention will be further described with reference to the accompanying drawings and examples. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict. For convenience of description, the words "upper", "lower", "left", "right", "inner" and "outer" will be used hereinafter to refer only to the upper, lower, left, right, inner and outer directions of the drawings, and shall not limit the structure.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the present invention is not limited to the limitations of the specific embodiments of the present disclosure.

Embodiment, as shown in fig. 1, the utility model provides a pair of fire-retardant flexible fireproof cable of low smoke and zero halogen, include oversheath layer 1, fire-retardant protective layer 2, around covering 3, inner sheath 4, filling layer 5 and cable core 6, the inside of cable core 6 is provided with a plurality of conductor cores 61. The outer sheath layer 1 has a wear-resistant protection effect, the flame-retardant outer protection layer 2 has a flame-retardant effect and is mainly made of polyolefin materials; the wrapping layer 3 is mainly a steel belt or an aluminum belt, has shielding and anti-interference functions, and the filler of the filling layer 5 can ensure the roundness of the cable.

Furthermore, a plurality of axial pull grooves 21 are uniformly arranged on the outer side surface of the flame-retardant protective layer 2 provided by the utility model, each conductor core 61 comprises three twisted tinned copper wires 611, an insulating layer 612 and a shielding layer 613 which are coated on the outer sides of the three copper wires, a first filling layer 51 is arranged between the insulating layer 612 and the copper wire 611, a second filling layer 52 is arranged between the shielding layer 613 and the inner sheath 4, the cross section of the inner sheath 4 is circular and made of flame retardant polyolefin material, the outer side of the inner sheath 4 is sequentially coated with a third filling layer 53, a square sheath 7, a fourth filling layer 54, a wrapping layer 3, a flame retardant protective layer 2 and an outer sheath layer 1, four corners of the square sleeve 7 are in round corner transition, two sides of each corner of the square sleeve 7 are provided with a resisting brace 8, the cross-sectional shape of the anti-bracing piece 8 is circular and is provided with a steel wire 9 at the geometric center thereof. The axial pull groove 21 on the flame-retardant protective layer 2 can enable the flame-retardant protective layer to have certain flexibility, improve the fatigue limit of the flame-retardant protective layer and be beneficial to exerting the cable protection function to the maximum extent; the conductor core 61 formed by twisting three tinned copper wires is adopted, so that the strength and the conductive stability of the conductor core are improved, the insulating layer 612 and the shielding layer 613 are utilized to play a role in shielding the inner layer, and the anti-interference effect of the cable is ensured by matching with the shielding effect of the outer layer of the wrapping layer 3; the device is particularly additionally provided with the square sleeve 7, the square sleeve 7 has a reinforcing effect, particularly the bending strength and flexibility ratio of the cable is increased, and meanwhile, the service life of the cable is effectively prolonged.

More specifically, the square sleeve 7 is mainly made of a heat-shrinkable material and is formed by heat shrinkage, and the corners of the square sleeve are in fillet transition, so that the radial width of the cable is reduced, and meanwhile, the reinforcing effect of the square sleeve can be better exerted by the seam repairing and shaping effects of the third filling layer 53 and the fourth filling layer 54; the device can increase the tensile strength of the cable in the length direction of the wire core by utilizing the combined action of the anti-pulling strip 8 and the steel wire 9, and the anti-pulling strip 8 is made of flame-retardant polyolefin materials, so that the compactness of the anti-pulling strip and the whole steel wire in the fourth filling layer 54 can be improved; the anti-pulling strip 8 has the other function of applying certain extrusion force to the square sleeve corner in the filling process, and preventing the square sleeve 7 from deflecting in the material shaping process outside the fourth filling layer, so that the structural effectiveness of the device is ensured.

In order to improve the bulk strength of cable, the utility model provides an inside of cable core 6 includes four conductor cores 61 that are two bisymmetry settings, and every conductor core 61 is relative with a corner of square cover 7 respectively. Because the acting force scope that conductor core applyed to square cover 7 is in square cover corner region basically, and the corner part of square cover 7 is the region that compressive strength degree is the biggest again, like this, just make the equilibrium degree of the material within the square cover better, and then be favorable to improving the bulk strength of cable, effectively prolong the life of cable.

Further, the utility model provides a every side of square cover 7 is provided with the arch 71 that cross sectional shape is spindle-shaped, and arch 71 is the thin middle thick characteristics in both ends, utilizes the arch to increase the compressive strength of square cover side part to balance the atress on the square cover better, its shape just in time can form the card cooperation effect for circular shape anti-brace 8 with the cross-section in addition, makes square cover 7 furthest exert the stiffening effect and does not influence the rounding degree of cable on unit length. It should be noted that the utility model discloses increased the structure that improves cable strength, nevertheless not lost the pliability of cable, only relative strength promotes to some extent.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in other forms, and any person skilled in the art may use the above-mentioned technical contents to change or modify the equivalent embodiment into equivalent changes and apply to other fields, but any simple modification, equivalent change and modification made to the above embodiments according to the technical matters of the present invention will still fall within the protection scope of the technical solution of the present invention.

Claims (3)

1. A low-smoke halogen-free flame-retardant flexible fireproof cable comprises an outer sheath layer, a flame-retardant protective layer, a wrapping layer, an inner sheath, a filling layer and a cable core, wherein a plurality of conductor cores are arranged inside the cable core, the cable is characterized in that a plurality of axial pull grooves are uniformly formed in the outer side surface of the flame-retardant protective layer, each conductor core comprises three twisted tinned copper wires, an insulating layer and a shielding layer, the insulating layer and the shielding layer are coated outside the three copper wires, a first filling layer is arranged between the insulating layer and the copper wires, a second filling layer is arranged between the shielding layer and the inner sheath, the inner sheath is circular in cross section and made of a flame-retardant polyolefin material, a third filling layer, a square sheath, a fourth filling layer, the wrapping layer, the flame-retardant protective layer and the outer sheath layer are sequentially coated outside the inner sheath, and four corners of the square, each side face of the square sleeve is provided with a protrusion with a spindle-shaped cross section, two sides of each corner of the square sleeve are provided with a counter brace, the cross section of the counter brace is circular, and a steel wire is arranged at the geometric center of the counter brace.

2. The low-smoke halogen-free flame-retardant flexible fireproof cable according to claim 1, wherein the inside of the cable core comprises four conductor cores arranged in pairwise symmetry, and each conductor core is opposite to one corner of the square sleeve.

3. The low smoke zero halogen flame retardant flexible fireproof cable of claim 2, wherein the anti-riblet is made of flame retardant polyolefin material.

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