Halogen-free low-smoke medium-voltage fireproof cable

Abstract

The utility model discloses a halogen-free low-smoke medium-voltage fireproof cable. The halogen-free low-smoke medium-voltage fireproof cable comprises a cable core, the cable comprises a cable core, at least six annularly distributed wire cores are arranged in the cable core, a gap is reserved between every two adjacent wire cores, the cable core is wrapped with a composite flame-retardant layer, the composite flame-retardant layer is composed of a flame-retardant inner layer, a stable layer and a flame-retardant coating, the flame-retardant inner layer is attached to the cable core, an armor layer is arranged outside the composite flame-retardant layer, and the armor layer is arranged outside the stable layer. The armor layer is composed of a base layer, a reinforcing layer and an anti-corrosion layer, the base layer is attached to the composite flame-retardant layer, the outer sheath is arranged outside the armor layer and composed of a sealing layer, a weather-proof layer and a wear-resistant layer, and the sealing layer makes contact with the armor layer. The problems that a medium-voltage cable generates a large amount of smoke and releases toxic substances in a fire environment are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of medium-voltage cables, in particular to a halogen-free low-smoke medium-voltage fireproof cable. Background Art

[0002] Medium voltage cable refers to power cable with rated voltage between 1kV and 35kV, which is mainly used for power transmission and distribution at medium current or medium voltage level. Medium voltage cable is usually composed of multiple parts, including conductor, insulation layer, conductor shielding layer, insulation layer cable core, metal sheath, metal sheath and outer sheath, etc. In the power system, medium voltage cable is an important link between substation and distribution network, and plays an important role in energy transmission and signal transmission. It is not only used for overhead bare wires, busbars, branch cables, etc. in the power system, but also for information transmission and instrumentation systems, such as urban communication cables, TV cables, data cables, etc.

[0003] For example, the Chinese authorized patent "A Medium Voltage Cable" with announcement number CN206893347U includes a conductor, an inner shielding layer, an insulating layer, an outer shielding layer and a protective layer. The inner shielding layer is coated on the conductor, the insulating layer is coated on the inner shielding layer, the outer shielding layer is coated on the insulating layer, and the protective layer is coated on the outer shielding layer. The conductor includes multiple fan-shaped parts, and the multiple fan-shaped parts form a ring structure. The conductor is composed of multiple fan-shaped parts, has good flexibility, and is convenient for cable laying. Multiple fan-shaped parts are directly in contact to form a conductor.

[0004] However, traditional medium-voltage cables often produce a large amount of smoke and toxic gases when a fire occurs, causing great trouble to the evacuation and rescue of personnel, and will release harmful substances and pollute the environment. Therefore, they do not meet existing needs. In this regard, we have proposed a halogen-free low-smoke medium-voltage fire-proof cable. Utility Model Content

[0005] The utility model aims to provide a halogen-free low-smoke medium-voltage fireproof cable to solve the problem that the medium-voltage cable mentioned in the background technology generates a large amount of smoke and releases a large amount of toxic substances in a fire environment.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a halogen-free low-smoke medium-voltage fire-proof cable, comprising a cable core; at least six wire cores distributed in a ring shape are arranged inside the cable core, and gaps are left between adjacent wire cores, the outside of the cable core is wrapped with a composite flame-retardant layer, the composite flame-retardant layer is composed of a flame-retardant inner layer, a stabilizing layer and a flame-retardant coating, and the flame-retardant inner layer is bonded to the cable core, an armor layer is arranged outside the composite flame-retardant layer, the armor layer is composed of a base layer, a reinforcement layer and an anti-corrosion layer, and the base layer is bonded to the composite flame-retardant layer, an outer sheath is arranged outside the armor layer, the outer sheath is composed of a sealing layer, a weather-resistant layer and a wear-resistant layer, and the sealing layer is in contact with the armor layer.

[0007] Preferably, the wire core comprises an insulating layer and a conductor, the conductor is formed by twisting a plurality of copper alloy wires, and the insulating layer is extruded and wrapped around the outside of the conductor.

[0008] Preferably, the gap between the cable core and the wire core is filled with filler.

[0009] Preferably, the stabilizing layer is located outside the flame retardant inner layer, and the flame retardant inner layer is adhered and fixed to the stabilizing layer, and the flame retardant coating is coated on the outer wall of the stabilizing layer.

[0010] Preferably, the reinforcement layer is interlaced and woven on the outer wall of the base layer, the anti-corrosion layer is located outside the reinforcement layer, and the reinforcement layer and the anti-corrosion layer are formed by extrusion.

[0011] Preferably, the weather-resistant layer is located outside the sealing layer, and the sealing layer and the weather-resistant layer are extruded and fixed, and the wear-resistant layer is located outside the weather-resistant layer, and the weather-resistant layer and the wear-resistant layer are extruded and formed.

[0012] Preferably, the thickness of the outer sheath is greater than the sum of the thicknesses of the composite flame retardant layer and the armor layer.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. The utility model is provided with a composite flame retardant layer, and the inorganic flame retardant and nanotechnology modified materials used are environmentally friendly materials and do not contain halogen. Therefore, less smoke and harmful gases are generated during combustion, which meets the environmental protection requirements of low smoke and halogen-free, and is beneficial to protecting the environment and personnel safety. The nanotechnology modified material of the middle layer has excellent thermal stability, and can maintain the structure and performance of the material stable under high temperature environment, further enhancing the flame retardant ability of the cable. The outer layer of the intumescent flame retardant coating can rapidly expand when heated to form a carbonized layer, isolating oxygen and heat. This self-extinguishing property helps to quickly control the fire when a fire occurs and reduce fire losses.

[0015] 2. The utility model is provided with an armor layer. The selection of outer protective materials ensures that the cable has good wear resistance, can resist frequent movement and friction, extend the service life of the cable, and can effectively resist external mechanical damage such as extrusion, impact, etc., and protect the cable body from damage. The whole cable is made of corrosion-resistant materials, can resist chemical corrosion and electrochemical corrosion, and ensure the stability and reliability of the cable in harsh environments.

[0016] 3. The utility model is provided with a composite outer sheath, and the inner sealing layer is made of a highly elastic and highly sealed material, which can effectively prevent water, moisture and chemicals from invading the interior of the cable, thereby ensuring the electrical performance and safety of the cable; the weather-resistant layer is made of a material with good weather resistance and strong corrosion resistance, which can protect the cable body from erosion and damage from the external environment for a long time, thereby extending the service life of the cable; the outer wear-resistant layer is made of a wear-resistant and weather-resistant material, which can resist external mechanical wear and erosion from harsh environments, thereby further increasing the durability of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is an overall stereogram of the utility model;

[0018] Figure 2 It is a schematic diagram of the cross-sectional structure of the utility model;

[0019] Figure 3 This is a schematic diagram of the flame retardant inner layer structure of the utility model;

[0020] Figure 4 This is a schematic diagram of the armor layer structure of the utility model;

[0021] Figure 5 This is a schematic diagram of the outer sheath structure of the utility model.

[0022] In the figure: 1. cable core; 2. wire core; 21. insulation layer; 22. conductor; 3. filler; 4. composite flame retardant layer; 41. flame retardant inner layer; 42. stabilization layer; 43. flame retardant coating; 5. armor layer; 51. base layer; 52. reinforcement layer; 53. anti-corrosion layer; 6. outer sheath; 61. sealing layer; 62. weather resistant layer; 63. wear resistant layer. DETAILED DESCRIPTION

[0023] 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.

[0024] See also Figure 1-5The utility model provides an embodiment: a halogen-free low-smoke medium-voltage fire-proof cable, comprising a cable core 1; at least six wire cores 2 distributed in a ring shape are arranged inside the cable core 1, and gaps are left between adjacent wire cores 2, the outside of the cable core 1 is wrapped with a composite flame-retardant layer 4, the composite flame-retardant layer 4 is composed of a flame-retardant inner layer 41, a stabilizing layer 42 and a flame-retardant coating 43, and the flame-retardant inner layer 41 is in contact with the cable core 1, an armor layer 5 is arranged outside the composite flame-retardant layer 4, the armor layer 5 is composed of a base layer 51, a reinforcement layer 52 and an anti-corrosion layer 53, and the base layer 51 is in contact with the composite flame-retardant layer 4, an outer sheath 6 is arranged outside the armor layer 5, the outer sheath 6 is composed of a sealing layer 61, a weather-resistant layer 62 and a wear-resistant layer 63, and the sealing layer 61 is in contact with the armor layer 5.

[0025] The composite flame retardant layer 4 forms multiple lines of defense through a multi-layer design, which significantly improves the flame retardant performance of the cable. The inorganic flame retardant in the inner layer can absorb heat and release water vapor, reducing the flame temperature and smoke generation; the nanotechnology modified material in the middle layer improves the thermal stability and flame retardant performance of the material; the intumescent flame retardant coating in the outer layer can rapidly expand to form a carbonized layer when heated, isolating oxygen and heat, thereby effectively preventing the spread of flames. The armor layer 5 is made of high-strength, corrosion-resistant metal materials, which can significantly enhance the mechanical strength of the cable, so that it can maintain stable performance in various harsh environments. By optimizing the design and material selection of the outer sheath 6, the overall performance of the cable can be improved, including electrical performance, mechanical performance and environmental adaptability, so as to meet the needs of different application scenarios.

[0026] See also Figure 1 and Figure 2 The core 2 includes an insulating layer 21 and a conductor 22. The conductor 22 is twisted by multiple copper alloy wires to ensure the electrical signal transmission efficiency of the cable, and the insulating layer 21 is extruded and wrapped around the outside of the conductor 22. The insulating layer 21 is a thermoplastic low-smoke halogen-free flame-retardant insulating material with excellent insulation and flame-retardant properties, and can effectively prevent the spread of fire when the cable is short-circuited or overloaded.

[0027] See also Figure 1 and Figure 2 The gap between the cable core 1 and the wire core 2 is filled with a filler 3 made of epoxy resin. Epoxy resin has excellent insulation properties, can further improve the insulation effect of the cable, reduce the risk of leakage, can firmly bond the internal structures of the cable, ensure the integrity and stability of the cable, and can fill the gaps inside the cable to make the cable look neater and smoother.

[0028] See also Figure 3The stabilizing layer 42 is located outside the flame retardant inner layer 41, and the flame retardant inner layer 41 is adhered and fixed to the stabilizing layer 42. The flame retardant coating 43 is coated on the outer wall of the stabilizing layer 42. The flame retardant inner layer 41 is made of polymer material filled with inorganic flame retardants, such as polyethylene composite materials containing aluminum hydroxide or magnesium hydroxide, which can absorb a large amount of heat and release water vapor during combustion, thereby reducing flame temperature and smoke generation; the stabilizing layer 42 is a polymer reinforced with nano-alumina, which can significantly improve the thermal stability and flame retardant properties of the material; the flame retardant coating 43 is an intumescent flame retardant coating, the main components of which are flame retardants and carbonizing agents. The coating can rapidly expand when heated to form a carbonized layer, isolating oxygen and heat, and further preventing the spread of flames.

[0029] See also Figure 4 The reinforcement layer 52 is interlaced and woven on the outer wall of the base layer 51, the anti-corrosion layer 53 is located outside the reinforcement layer 52, and the reinforcement layer 52 and the anti-corrosion layer 53 are formed by extrusion. The base layer 51 is polyvinyl chloride to prevent the cable body from being damaged during the armoring process, while providing certain buffering and isolation functions to ensure a close connection between the cable body and the armor layer; the reinforcement layer 52 is a galvanized steel belt with good mechanical properties and corrosion resistance, which can effectively resist external mechanical damage and erosion in harsh environments, and adopts an interlaced weaving or spiral winding method to provide uniform and strong protection; the anti-corrosion layer 53 is polyethylene to prevent the armor layer from being further worn and eroded, while improving the overall durability and service life of the cable.

[0030] See also Figure 5 The weather-resistant layer 62 is located outside the sealing layer 61, and the sealing layer 61 and the weather-resistant layer 62 are extruded and fixed. The wear-resistant layer 63 is located outside the weather-resistant layer 62, and the weather-resistant layer 62 and the wear-resistant layer 63 are extruded. The thickness of the outer sheath 6 is greater than the sum of the thicknesses of the composite flame-retardant layer 4 and the armor layer 5. The sealing layer 61 is a thermoplastic elastomer to prevent water, moisture and chemicals from invading the interior of the cable to ensure the electrical performance and safety of the cable. The weather-resistant layer 62 is cross-linked polyethylene to provide long-term protection for the cable body to prevent erosion and damage from the external environment. The wear-resistant layer 63 is nylon to resist external mechanical wear and erosion from harsh environments to extend the service life of the cable.

[0031] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A halogen-free low-smoke medium-voltage fireproof cable, comprising a cable core (1); characterized in that: The cable core (1) is provided with at least six wire cores (2) distributed in an annular shape inside, and gaps are left between adjacent wire cores (2). The cable core (1) is wrapped with a composite flame retardant layer (4) outside, the composite flame retardant layer (4) is composed of a flame retardant inner layer (41), a stabilizing layer (42) and a flame retardant coating (43), and the flame retardant inner layer (41) is bonded to the cable core (1). An armor layer (5) is provided outside the composite flame retardant layer (4), the armor layer (5) is composed of a base layer (51), a reinforcement layer (52) and an anti-corrosion layer (53), and the base layer (51) is bonded to the composite flame retardant layer (4). An outer sheath (6) is provided outside the armor layer (5), the outer sheath (6) is composed of a sealing layer (61), a weather-resistant layer (62) and a wear-resistant layer (63), and the sealing layer (61) is in contact with the armor layer (5).

2. A halogen-free low-smoke medium-voltage fireproof cable according to claim 1, characterized in that: The wire core (2) comprises an insulating layer (21) and a conductor (22); the conductor (22) is formed by twisting a plurality of copper alloy wires, and the insulating layer (21) is extruded and wrapped around the outside of the conductor (22).

3. The halogen-free low-smoke medium-voltage fireproof cable according to claim 1, characterized in that: The gap between the cable core (1) and the wire core (2) is filled with a filler (3).

4. The halogen-free low-smoke medium-voltage fireproof cable according to claim 1, characterized in that: The stabilizing layer (42) is located outside the flame retardant inner layer (41), and the flame retardant inner layer (41) and the stabilizing layer (42) are adhered and fixed, and the flame retardant coating (43) is coated on the outer wall of the stabilizing layer (42).

5. The halogen-free low-smoke medium-voltage fireproof cable according to claim 1, characterized in that: The strengthening layer (52) is interlaced and woven on the outer wall of the base layer (51); the anti-corrosion layer (53) is located outside the strengthening layer (52); and the strengthening layer (52) and the anti-corrosion layer (53) are formed by extrusion.

6. The halogen-free low-smoke medium-voltage fireproof cable according to claim 1, characterized in that: The weather-resistant layer (62) is located outside the sealing layer (61), and the sealing layer (61) and the weather-resistant layer (62) are fixed by extrusion; the wear-resistant layer (63) is located outside the weather-resistant layer (62), and the weather-resistant layer (62) and the wear-resistant layer (63) are extruded and formed.

7. The halogen-free low-smoke medium-voltage fireproof cable according to claim 1, characterized in that: The thickness of the outer sheath (6) is greater than the sum of the thicknesses of the composite flame retardant layer (4) and the armor layer (5).

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