Irradiation cross-linked polyolefin flame-retardant power cable

Abstract

The utility model discloses an irradiation crosslinking polyolefin flame-retardant power cable which comprises a cable core, the cable core comprises a wire core and a flame-retardant filling layer, a mica wrapping layer is arranged outside the cable core, the mica wrapping layer is attached to the flame-retardant filling layer, an inner lining layer is arranged outside the mica wrapping layer, and an outer lining layer is arranged outside the inner lining layer. An inner lining layer is arranged outside the mica wrapping layer, the inner lining layer and the mica wrapping layer are formed through extrusion, an aluminum foil armor layer is arranged outside the inner lining layer, the aluminum foil armor layer is attached to the inner lining layer, a composite flame-retardant layer is arranged outside the aluminum foil armor layer, an outer sheath is arranged outside the composite flame-retardant layer, and an outer sheath is arranged outside the outer sheath. The aluminum foil armor layer, the composite flame-retardant layer and the outer sheath are formed through extrusion, the outer sheath of the power cable adopts polyolefin as a base material, the polyolefin is subjected to irradiation cross-linking treatment, the irradiation cross-linking reaction can improve the charring property of the polyolefin, the flame retardance of the polyolefin is further improved, the composite flame-retardant layer is arranged in the cable, and the flame-retardant property of the cable is improved. And the flame-retardant effect of the power cable is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power cables, in particular to a radiation cross-linked polyolefin flame-retardant power cable. Background Art

[0002] Power cables are cable products used to transmit and distribute high-power electric energy in the main lines of the power system, including power cables with various voltage levels and insulation of 1-500KV and above. The basic structure of power cables consists of four parts: core, insulation layer, shielding layer and protective layer. They are often used in urban underground power grids, power station lead-out lines, internal power supply of industrial and mining enterprises, and underwater transmission lines across rivers and seas. It has many product types and a wide range of applications, involving power, construction, communications, manufacturing and other industries. With the frequent occurrence of fire accidents, the awareness of the fire hazard of wires and cables has been continuously deepened, and the requirements of relevant departments for the fire retardant and other properties of wires and cables have become increasingly higher.

[0003] The Chinese patent announcement number is CN20195611U, and the authorization announcement date is August 31, 2011. It is a radiation cross-linked polyolefin insulated and sheathed reinforced flame-retardant power cable, which belongs to the field of cable technology. It includes a cable core cabled by an insulated core and an inner lining layer, an oxygen barrier layer and a sheath arranged on the cable core in sequence. It is characterized in that the insulated core is composed of an irradiated cross-linked low-smoke halogen-free polyolefin insulation layer extruded on the conductor, and the sheath is a polytetrafluoroethylene propylene sheath that complies with GJB773A-2000. The utility model has a reasonable and simple structure, is easy to manufacture, has low cost, and has good performance. The utility model has a long service life, high flame retardant performance, excellent tensile strength, electrical performance, and physical and mechanical properties. The product is an ideal choice for cables used in power stations, subways, stations, hotels, hospitals and other places.

[0004] Existing power cables are mainly fire-proofed and flame-retardant through the outer sheath. The outer sheath is flame-retardant with polyolefin, and the flame-retardant performance is single. When encountering high temperature or fire, the outer sheath is easily melted by heat and does not have sufficient flame-retardant effect. The safe use of the cable cannot be guaranteed, the use effect of the cable is reduced, and it cannot meet the use requirements. Utility Model Content

[0005] The utility model aims to provide a radiation cross-linked polyolefin flame-retardant power cable to solve the problem in the above background technology that the existing power cable is mainly fireproofed and flame-retarded by the outer sheath, and the outer sheath is flame-retarded by polyolefin, and the flame-retardant performance is single. When encountering high temperature or fire, the outer sheath is easily melted by heat, and does not have sufficient flame-retardant effect, and the safe use of the cable cannot be guaranteed, the use effect of the cable is reduced, and the use requirements cannot be met.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a radiation cross-linked polyolefin flame-retardant power cable, comprising a cable core, wherein the cable core comprises a wire core and a flame-retardant filling layer, wherein three wire cores are arranged equidistantly in a triangle, a mica sheath is arranged on the outside of the cable core, and the mica sheath is bonded to the flame-retardant filling layer, an inner lining layer is arranged on the outside of the mica sheath, and the inner lining layer and the mica sheath are formed by extrusion, an aluminum foil armor layer is arranged on the outside of the inner lining layer, and the aluminum foil armor layer is bonded to the inner lining layer, a composite flame-retardant layer is arranged on the outside of the aluminum foil armor layer, an outer sheath is arranged on the outside of the composite flame-retardant layer, and the aluminum foil armor layer, the composite flame-retardant layer and the outer sheath are formed by extrusion.

[0007] Preferably, the wire core includes a conductor, an insulating layer and a shielding layer, the conductor is formed by twisting a plurality of metal wires, the insulating layer is arranged outside the conductor, the shielding layer is arranged outside the insulating layer, and the conductor, the insulating layer and the shielding layer are formed by extrusion.

[0008] Preferably, the outer sheath comprises a radiation cross-linked polyolefin layer and an anti-aging coating, wherein the anti-aging coating is arranged outside the radiation cross-linked polyolefin layer, and the anti-aging coating and the radiation cross-linked polyolefin layer are coated as one body.

[0009] Preferably, the composite flame retardant layer includes an oxygen isolation layer, an inorganic hydroxide flame retardant layer and a waterproof layer, the oxygen isolation layer is arranged on the outside of the inorganic hydroxide flame retardant layer, the waterproof layer is arranged on the inside of the inorganic hydroxide flame retardant layer, and the oxygen isolation layer, the inorganic hydroxide flame retardant layer and the waterproof layer are arranged as a whole, the oxygen isolation layer is bonded to the radiation cross-linked polyolefin layer, and the waterproof layer is bonded to the aluminum foil armor layer.

[0010] Preferably, the flame retardant filling layer is arranged at the gap between the three wire cores, and the cross section of the flame retardant filling layer is circular, and the mica wrapping layer is spirally wound on the outside of the flame retardant filling layer.

[0011] Preferably, a color identification strip is provided on the outer wall of the shielding layer, and the color identification strip is integrated with the shielding layer.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] The utility model device is provided with an outer sheath, and the outer sheath is composed of a double-layer structure of a radiation cross-linked polyolefin layer and an anti-aging coating. The polyolefin is subjected to radiation cross-linking treatment, and the radiation cross-linking reaction can improve the carbonization of the polyolefin, thereby improving its flame retardancy, so that the cable has excellent flame retardancy, high heat resistance, and excellent physical and mechanical properties, and improves the fire retardant effect of the cable. The anti-aging coating can inhibit and delay the substances caused by ultraviolet light aging on the outer sheath, and can absorb or reflect ultraviolet rays, thereby improving the overall aging resistance of the cable and increasing the service life of the power cable.

[0014] The utility model device is provided with a composite flame retardant layer, and the composite flame retardant layer is composed of a multi-layer structure of an oxygen isolation layer, an inorganic hydroxide flame retardant layer and a waterproof layer. The inorganic hydroxide flame retardant layer decomposes when heated, releases a large amount of water and absorbs heat, reduces the actual temperature of the cable material, and thus inhibits the decomposition of the material and the release of combustible gas. The oxygen isolation layer can isolate the air, and the waterproof layer can waterproof. The metal oxides produced by the decomposition cover the surface of the material, thereby enhancing the ability of the cable to resist flames and further improving the effect of preventing combustion. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 It is a cross-sectional view of the wire core of the utility model;

[0017] Figure 3 This is a structural diagram of the composite flame retardant layer of the utility model;

[0018] Figure 4 This is a structural diagram of the outer sheath of the present utility model.

[0019] In the figure: 1. Cable core; 2. Wire core; 3. Flame retardant filling layer; 4. Mica winding layer; 5. Inner lining layer; 6. Aluminum foil armor layer; 7. Composite flame retardant layer; 8. Outer sheath; 9. Conductor; 10. Insulation layer; 11. Shielding layer; 12. Oxygen barrier layer; 13. Inorganic hydroxide flame retardant layer; 14. Waterproof layer; 15. Radiation cross-linked polyolefin layer; 16. Anti-aging coating; 17. Color identification strip. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0021] See also Figure 1-4The utility model provides an embodiment: a radiation cross-linked polyolefin flame-retardant power cable, comprising a cable core 1, the cable core 1 comprising a wire core 2 and a flame-retardant filling layer 3, three wire cores 2 are arranged, and the three wire cores 2 are arranged equidistantly in a triangle, a mica sheath 4 is arranged outside the cable core 1, and the mica sheath 4 is bonded to the flame-retardant filling layer 3, an inner lining layer 5 is arranged outside the mica sheath 4, and the inner lining layer 5 and the mica sheath 4 are formed by extrusion, an aluminum foil armor layer 6 is arranged outside the inner lining layer 5, and the aluminum foil armor layer 6 is bonded to the inner lining layer 5, a composite flame-retardant layer 7 is arranged outside the aluminum foil armor layer 6, an outer sheath 8 is arranged outside the composite flame-retardant layer 7, and the aluminum foil armor layer 6, the composite flame-retardant layer 7 and the outer sheath 8 are formed by extrusion.

[0022] See also Figure 1 and Figure 2 The core 2 includes a conductor 9, an insulating layer 10 and a shielding layer 11. The conductor 9 is formed by twisting a plurality of metal wires. The insulating layer 10 is arranged outside the conductor 9. The shielding layer 11 is arranged outside the insulating layer 10. The conductor 9, the insulating layer 10 and the shielding layer 11 are formed by extrusion.

[0023] See also Figure 1 and Figure 4 The outer sheath 8 includes a radiation cross-linked polyolefin layer 15 and an anti-aging coating 16. The anti-aging coating 16 is arranged on the outside of the radiation cross-linked polyolefin layer 15, and the anti-aging coating 16 and the radiation cross-linked polyolefin layer 15 are coated as a whole. The polyolefin is subjected to radiation cross-linking treatment, and the radiation cross-linking reaction can improve the carbonization of the polyolefin, thereby improving its flame retardancy, so that the cable has excellent flame retardancy, high heat resistance, and excellent physical and mechanical properties, thereby improving the fire retardant effect of the cable. The anti-aging coating 16 can inhibit and delay the substances that cause light aging of the outer sheath due to ultraviolet rays, and can absorb or reflect ultraviolet rays, thereby improving the overall aging resistance of the cable and increasing the service life of the power cable.

[0024] See also Figure 1 and Figure 3The composite flame retardant layer 7 includes an oxygen barrier layer 12, an inorganic hydroxide flame retardant layer 13 and a waterproof layer 14. The oxygen barrier layer 12 is arranged on the outside of the inorganic hydroxide flame retardant layer 13, and the waterproof layer 14 is arranged on the inside of the inorganic hydroxide flame retardant layer 13. The oxygen barrier layer 12, the inorganic hydroxide flame retardant layer 13 and the waterproof layer 14 are arranged as a whole. The oxygen barrier layer 12 is bonded to the radiation cross-linked polyolefin layer 15, and the waterproof layer 14 is bonded to the aluminum foil armor layer 6. The inorganic hydroxide flame retardant layer 13 decomposes when heated, releases a large amount of water and absorbs heat, reduces the actual temperature of the cable material, thereby inhibiting the decomposition of the material and the release of combustible gases. The oxygen barrier layer 12 can isolate the air, and the waterproof layer 14 can waterproof. The metal oxides produced by the decomposition cover the surface of the material, which enhances the ability of the cable to resist flames and further improves the effect of preventing combustion.

[0025] See also Figure 1 The flame retardant filling layer 3 is arranged at the gap between the three wire cores 2 , and the cross section of the flame retardant filling layer 3 is circular, and the mica wrapping layer 4 is spirally wound on the outside of the flame retardant filling layer 3 .

[0026] See also Figure 2 A color identification strip 17 is provided on the outer wall of the shielding layer 11, and the color identification strip 17 is integrated with the shielding layer 11. The functional characteristics of the wire core 2 are marked by the color identification strip 17, which is convenient for the staff to use for wiring.

[0027] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0028] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A radiation cross-linked polyolefin flame-retardant power cable, comprising a cable core (1), characterized in that: The cable core (1) comprises a wire core (2) and a flame retardant filling layer (3), three wire cores (2) are provided, and the three wire cores (2) are arranged equidistantly in a triangular shape; a mica sheath (4) is provided on the outside of the cable core (1), and the mica sheath (4) is bonded to the flame retardant filling layer (3); an inner lining layer (5) is provided on the outside of the mica sheath (4), and the inner lining layer (5) and the mica sheath (4) are formed by extrusion; an aluminum foil armor layer (6) is provided on the outside of the inner lining layer (5), and the aluminum foil armor layer (6) is bonded to the inner lining layer (5); a composite flame retardant layer (7) is provided on the outside of the aluminum foil armor layer (6), an outer sheath (8) is provided on the outside of the composite flame retardant layer (7), and the aluminum foil armor layer (6), the composite flame retardant layer (7) and the outer sheath (8) are formed by extrusion.

2. The radiation cross-linked polyolefin flame-retardant power cable according to claim 1, characterized in that: The wire core (2) comprises a conductor (9), an insulating layer (10) and a shielding layer (11); the conductor (9) is formed by twisting a plurality of metal wires; the insulating layer (10) is arranged outside the conductor (9); the shielding layer (11) is arranged outside the insulating layer (10); and the conductor (9), the insulating layer (10) and the shielding layer (11) are formed by extrusion.

3. The radiation cross-linked polyolefin flame-retardant power cable according to claim 1, characterized in that: The outer sheath (8) comprises a radiation cross-linked polyolefin layer (15) and an anti-aging coating (16); the anti-aging coating (16) is arranged outside the radiation cross-linked polyolefin layer (15), and the anti-aging coating (16) and the radiation cross-linked polyolefin layer (15) are coated as a whole.

4. The radiation cross-linked polyolefin flame-retardant power cable according to claim 3, characterized in that: The composite flame retardant layer (7) comprises an oxygen barrier layer (12), an inorganic hydroxide flame retardant layer (13) and a waterproof layer (14); the oxygen barrier layer (12) is arranged outside the inorganic hydroxide flame retardant layer (13); the waterproof layer (14) is arranged inside the inorganic hydroxide flame retardant layer (13); the oxygen barrier layer (12), the inorganic hydroxide flame retardant layer (13) and the waterproof layer (14) are arranged as a whole; the oxygen barrier layer (12) is bonded to the radiation cross-linked polyolefin layer (15); and the waterproof layer (14) is bonded to the aluminum foil armor layer (6).

5. The radiation cross-linked polyolefin flame-retardant power cable according to claim 1, characterized in that: The flame retardant filling layer (3) is arranged at the gap between the three wire cores (2), and the cross section of the flame retardant filling layer (3) is circular, and the mica wrapping layer (4) is spirally wound on the outside of the flame retardant filling layer (3).

6. The radiation cross-linked polyolefin flame-retardant power cable according to claim 2, characterized in that: A color identification strip (17) is provided on the outer wall of the shielding layer (11), and the color identification strip (17) and the shielding layer (11) are integrally formed.

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