Medium-voltage fireproof power cable

Abstract

The utility model relates to the technical field of cables, and discloses a medium-voltage fire-resistant power cable, which comprises a plurality of conductors, semi-conductive cross-linked inner screen layers are arranged outside the conductors, XLPE insulating layers are arranged outside the semi-conductive cross-linked inner screen layers, semi-conductive cross-linked outer screen layers are arranged outside the XLPE insulating layers, and the outer screen layers are arranged outside the semi-conductive cross-linked outer screen layers. A high-conductivity metal shield is arranged outside each semi-conductive cross-linked outer screen layer, a first ceramic silicone rubber fire insulation layer is arranged outside each high-conductivity metal shield, and a second ceramic silicone rubber fire insulation layer is arranged outside the first ceramic silicone rubber fire insulation layer. According to the utility model, the fire-resistant and heat-insulating material is a magnesium hydroxide fire-resistant, high-oxygen-index, low-smoke, halogen-free and flame-retardant polyolefin oxygen-insulating material, combined water is released, latent heat is absorbed and the surface temperature of the filled synthetic material in flame is reduced when the fire-resistant and heat-insulating material is heated and decomposed, so that the fire-resistant and heat-insulating material has the effects of inhibiting polymer decomposition and cooling generated combustible gas.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to a medium-voltage fire-resistant power cable. Background Art

[0002] In power system fire accidents globally, the proportion of power system power outages caused by power cable fires shows an upward trend; in high-rise buildings, due to the dense population and more concentrated electrical equipment, the safety requirements for electrical circuits are higher; as the main force in power supply and distribution - cross-linked polyethylene insulated low-smoke zero-halogen fire-resistant medium-voltage power cables, there is a huge market demand; the cables will be widely used in medium-voltage distribution systems in important places such as high-rise buildings, petrochemical industries, power plants, nuclear power plants, subways, and tunnels.

[0003] During the use of existing cables, a large amount of heat energy will be generated. If the heat energy cannot be discharged in time and interacts with the external high-temperature environment, a fire may occur. Therefore, the fire-proof performance of the cables urgently needs to be improved. Content of the Utility Model

[0004] The purpose of the utility model is to solve the disadvantages existing in the prior art, and a medium-voltage fire-resistant power cable is proposed. The effects of fire prevention, heat insulation, and high temperature resistance are far higher than those of metal sheaths; the mechanical properties are high; it has good process performance; it can replace the copper sheath of flexible fire-resistant cables and solve the welding problem of argon arc welding; the process is simple, and the production cost and efficiency are far higher than those of copper sheaths and aluminum sheaths.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] A medium-voltage fire-resistant power cable includes a plurality of conductors. A semiconductive cross-linked inner screen layer is arranged outside each conductor. An XLPE insulation layer is arranged outside each semiconductive cross-linked inner screen layer. A semiconductive cross-linked outer screen layer is arranged outside each XLPE insulation layer. A high-conductivity metal shield is arranged outside each semiconductive cross-linked outer screen layer. A first ceramicized silicone rubber fire-separating layer is arranged outside each high-conductivity metal shield. A second ceramicized silicone rubber fire-separating layer is jointly arranged outside the first ceramicized silicone rubber fire-separating layers. A flame-retardant filler is arranged between the first ceramicized silicone rubber fire-separating layer and the second ceramicized silicone rubber fire-separating layer.

[0007] Further, a low-smoke zero-halogen high-flame-retardant tape-wound inner flame-retardant layer is arranged outside the second ceramicized silicone rubber fire-separating layer. An extruded low-smoke zero-halogen oxygen barrier layer is arranged outside the low-smoke zero-halogen high-flame-retardant tape-wound inner flame-retardant layer. An extruded magnesium hydroxide fire and flame retardant layer is arranged outside the extruded low-smoke zero-halogen oxygen barrier layer.

[0008] Further, an outer flame-retardant layer wrapped with a first low-smoke, halogen-free, highly flame-retardant tape is provided outside the extruded magnesium hydroxide fireproof and flame-retardant layer. A metal fireproof layer is provided outside the outer flame-retardant layer wrapped with the first low-smoke, halogen-free, highly flame-retardant tape. A second low-smoke, halogen-free, highly flame-retardant tape is provided outside the metal fireproof layer.

[0009] Further, tensile steel wires are provided inside the metal fireproof layer.

[0010] Further, an extruded low-smoke, halogen-free, highly flame-retardant polyolefin outer sheath is provided outside the outer flame-retardant layer wrapped with the second low-smoke, halogen-free, highly flame-retardant tape.

[0011] Further, a plurality of wear-resistant ribs are provided inside the extruded low-smoke, halogen-free, highly flame-retardant polyolefin outer sheath.

[0012] Further, a plurality of wear-resistant blocks are provided outside the extruded low-smoke, halogen-free, highly flame-retardant polyolefin outer sheath.

[0013] The utility model has the following beneficial effects:

[0014] 1. In the utility model, the fireproof and heat-insulating material is magnesium hydroxide fireproof and high oxygen index low-smoke, halogen-free flame-retardant polyolefin oxygen isolation material. When heated and decomposed, it releases combined water and absorbs a large amount of latent heat to reduce the surface temperature of the synthetic material filled in it in the flame, having the functions of inhibiting polymer decomposition and cooling the generated combustible gas; the fireproof, heat-insulating, and high-temperature resistant effects are far higher than those of the metal sheath; the mechanical properties are high; it has good process performance; it can replace the copper sheath of the flexible fireproof and fire-resistant cable and solve the welding problem of argon arc welding; the process is simple, and the production cost and efficiency are far higher than those of the copper sheath and aluminum sheath. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a plan view of a medium-voltage fire-resistant power cable proposed by the utility model;

[0016] Figure 2 is a three-dimensional view of a medium-voltage fire-resistant power cable proposed by the utility model;

[0017] Figure 3 is a conductor view of a medium-voltage fire-resistant power cable proposed by the utility model;

[0018] Figure 4 is a tensile steel wire view of a medium-voltage fire-resistant power cable proposed by the utility model;

[0019] Figure 5 is a wear-resistant block view of a medium-voltage fire-resistant power cable proposed by the utility model.

[0020] Legend Explanation:

[0021] 1. Conductor; 2. Semi-conductive cross-linked inner screen layer; 3. XLPE insulation layer; 4. Semi-conductive cross-linked outer screen layer; 5. High-conductivity metal shield; 6. First ceramized silicone rubber fireproof layer; 7. Flame-retardant filler; 8. Second ceramized silicone rubber fireproof layer; 9. Low-smoke and halogen-free high-flame-retardant tape-wound inner flame-retardant layer; 10. Extruded low-smoke and halogen-free oxygen barrier layer; 11. Extruded magnesium hydroxide fireproof and flame-retardant layer; 12. First low-smoke and halogen-free high-flame-retardant tape-wound outer flame-retardant layer; 13. Metal fireproof layer; 14. Second low-smoke and halogen-free high-flame-retardant tape-wound outer flame-retardant layer; 15. Tensile steel wire; 16. Extruded low-smoke and halogen-free high-flame-retardant polyolefin outer sheath; 17. Wear-resistant rib; 18. Wear-resistant block. Detailed implementation manner

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0023] Refer to Figures 1-5 , an embodiment provided by the present invention: A medium-voltage fire-resistant power cable includes a plurality of conductors 1. A semi-conductive cross-linked inner screen layer 2 is provided outside each conductor 1. An XLPE insulation layer 3 is provided outside each semi-conductive cross-linked inner screen layer 2. A semi-conductive cross-linked outer screen layer 4 is provided outside each XLPE insulation layer 3. A high-conductivity metal shield 5 is provided outside each semi-conductive cross-linked outer screen layer 4. A first ceramized silicone rubber fireproof layer 6 is provided outside each high-conductivity metal shield 5. A second ceramized silicone rubber fireproof layer 8 is commonly provided outside the first ceramized silicone rubber fireproof layer 6. A flame-retardant filler 7 is provided between the first ceramized silicone rubber fireproof layer 6 and the second ceramized silicone rubber fireproof layer 8; the conductor 1 is used for conducting electricity: the semi-conductive cross-linked inner screen layer 2, the XLPE insulation layer 3, and the semi-conductive cross-linked outer screen layer 4 are mainly used for electrical insulation; the high-conductivity metal shield 5 and the first ceramized silicone rubber fireproof layer 6 are used for tying and fixing: the flame-retardant filler 7 and the second ceramized silicone rubber fireproof layer 8 play a role in fixing and flame retardancy.

[0024] An inner flame-retardant layer 9 wrapped with a low-smoke, halogen-free, highly flame-retardant tape is arranged outside the second ceramized silicone rubber fireproof layer 8. An extruded low-smoke, halogen-free oxygen barrier layer 10 is arranged outside the inner flame-retardant layer 9 wrapped with the low-smoke, halogen-free, highly flame-retardant tape. An extruded magnesium hydroxide fireproof and flame-blocking layer 11 is arranged outside the extruded low-smoke, halogen-free oxygen barrier layer 10; a first outer flame-retardant layer 12 wrapped with a low-smoke, halogen-free, highly flame-retardant tape is arranged outside the extruded magnesium hydroxide fireproof and flame-blocking layer 11. A metal fireproof layer 13 is arranged outside the first outer flame-retardant layer 12 wrapped with the low-smoke, halogen-free, highly flame-retardant tape. Tensile steel wires 15 are arranged inside the metal fireproof layer 13. A second outer flame-retardant layer 14 wrapped with a low-smoke, halogen-free, highly flame-retardant tape is arranged outside the metal fireproof layer 13; the extruded low-smoke, halogen-free oxygen barrier layer 10 and the extruded magnesium hydroxide fireproof and flame-blocking layer 11 are magnesium hydroxide refractory and high-oxygen-index low-smoke, halogen-free flame-retardant polyolefin oxygen barrier materials. When heated and decomposed, they release bound water and absorb a large amount of latent heat to reduce the surface temperature of the synthetic materials they fill in the flame, and have the functions of inhibiting polymer decomposition and cooling the generated combustible gases.

[0025] An extruded low-smoke, halogen-free, highly flame-retardant polyolefin outer sheath 16 is arranged outside the second outer flame-retardant layer 14 wrapped with a low-smoke, halogen-free, highly flame-retardant tape. A plurality of wear-resistant ribs 17 are arranged inside the extruded low-smoke, halogen-free, highly flame-retardant polyolefin outer sheath 16. A plurality of wear-resistant blocks 18 are arranged outside the extruded low-smoke, halogen-free, highly flame-retardant polyolefin outer sheath 16; the arranged wear-resistant ribs 17 and wear-resistant blocks 18 can effectively reduce the wear of the extruded low-smoke, halogen-free, highly flame-retardant polyolefin outer sheath 16 and increase the anti-wear performance at the same time.

[0026] Working principle:

[0027] S1: The conductor 1 uses a stranded copper conductor, meeting the requirements of GB / T3956;

[0028] S2: The semiconductive cross-linked inner screen layer 2, XLPE insulation layer 3, and semiconductive cross-linked outer screen layer 4 are co-extruded, meeting the requirements of GB / T12706;

[0029] S3: The high-conductivity metal shield 5 and the first ceramized silicone rubber fireproof layer 6 are wrapped with silicone rubber tape;

[0030] S4: Cable stranding: The flame-retardant filler 7, the second ceramized silicone rubber fireproof layer 8, and the inner flame-retardant layer 9 wrapped with a low-smoke, halogen-free, highly flame-retardant tape are wrapped;

[0031] S5: The extruded low-smoke, halogen-free oxygen barrier layer 10 is extruded;

[0032] S6: The extruded magnesium hydroxide fireproof and flame-blocking layer 11 is extruded;

[0033] S7: The first outer flame-retardant layer 12 wrapped with a low-smoke, halogen-free, highly flame-retardant tape is wrapped;

[0034] S8: Wrap the metal fireproof layer 13 and the second low-smoke, halogen-free and high flame-retardant tape around the outer flame-retardant layer 14;

[0035] S9: Extrude and cover the low-smoke, halogen-free and high flame-retardant polyolefin outer sheath 16;

[0036] S10: Conduct final inspection and store in warehouse.

[0037] Finally, it should be noted that the above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A medium-voltage fire-resistant power cable, comprising a plurality of conductors (1), characterized in that: A semiconductive crosslinked inner screen layer (2) is provided on the outside of the conductor (1). An XLPE insulation layer (3) is provided on the outside of the semiconductive crosslinked inner screen layer (2). A semiconductive crosslinked outer screen layer (4) is provided on the outside of the XLPE insulation layer (3). A high conductivity metal shield (5) is provided on the outside of the semiconductive crosslinked outer screen layer (4). A first ceramizable silicone rubber fireproof layer (6) is provided on the outside of the high conductivity metal shield (5). A second ceramizable silicone rubber fireproof layer (8) is provided jointly on the outside of the first ceramizable silicone rubber fireproof layer (6). A flame retardant filler (7) is provided between the first ceramizable silicone rubber fireproof layer (6) and the second ceramizable silicone rubber fireproof layer (8).

2. The medium-voltage fire-resistant power cable according to claim 1, characterized in that: A low-smoke and halogen-free high flame retardant tape-wrapped inner flame retardant layer (9) is provided on the outside of the second ceramizable silicone rubber fireproof layer (8). An extruded low-smoke and halogen-free oxygen barrier layer (10) is provided on the outside of the low-smoke and halogen-free high flame retardant tape-wrapped inner flame retardant layer (9). An extruded magnesium hydroxide fireproof and flame retardant layer (11) is provided on the outside of the extruded low-smoke and halogen-free oxygen barrier layer (10).

3. The medium-voltage fire-resistant power cable according to claim 2, characterized in that: A first low-smoke and halogen-free high flame retardant tape-wrapped outer flame retardant layer (12) is provided on the outside of the extruded magnesium hydroxide fireproof and flame retardant layer (11). A metal fireproof layer (13) is provided on the outside of the first low-smoke and halogen-free high flame retardant tape-wrapped outer flame retardant layer (12). A second low-smoke and halogen-free high flame retardant tape-wrapped outer flame retardant layer (14) is provided on the outside of the metal fireproof layer (13).

4. The medium-voltage fire-resistant power cable according to claim 3, characterized in that: A tensile steel wire (15) is provided inside the metal fireproof layer (13).

5. The medium-voltage fire-resistant power cable according to claim 3, wherein: An extruded low-smoke and halogen-free high flame retardant polyolefin outer sheath (16) is provided on the outside of the second low-smoke and halogen-free high flame retardant tape-wrapped outer flame retardant layer (14).

6. A medium-voltage fire-resistant power cable according to claim 5, characterized in that: A plurality of wear-resistant ribs (17) are provided inside the extruded low-smoke and halogen-free high flame retardant polyolefin outer sheath (16).

7. A medium-voltage fire-resistant power cable according to claim 5, characterized in that: A plurality of wear-resistant blocks (18) are provided on the outside of the extruded low-smoke and halogen-free high flame retardant polyolefin outer sheath (16).

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