Ageing-resistant light soft flame-retardant medium-voltage cable

Abstract

The utility model discloses an aging-resistant light soft flame-retardant medium-voltage cable, which comprises a cable core, the cable core comprises a wire core and a filling layer, a mica belting layer is arranged outside the cable core, an inner protection layer is arranged outside the mica belting layer, a tinned copper wire braid layer is arranged outside the inner protection layer, and the tinned copper wire braid layer is arranged outside the tinned copper wire braid layer. The composite flame-retardant layer is arranged outside the tinned copper wire braid layer, the outer sheath is arranged outside the composite flame-retardant layer, the outer wall of the outer sheath is coated with the anti-aging coating, the filling layer and the protective layer in the medium-voltage cable are made of light materials, the weight of the medium-voltage cable can be greatly reduced, the outer sheath is made of polyurethane, and therefore the medium-voltage cable is not prone to falling off due to the fact that the composite flame-retardant layer is arranged outside the tinned copper wire braid layer. The cable has high tear resistance, keeps excellent bending resistance and can be used in a repeated bending environment, and the aging-resistant coating is coated outside the outer sheath, so that the aging resistance of the cable is improved, and the cable has good weather resistance and aging resistance and can resist environmental factors such as ultraviolet rays, oxygen and moisture to a certain extent.

Description

Technical Field

[0001] The utility model relates to the technical field of medium - voltage cables, and particularly relates to an anti - aging light - weight flexible flame - retardant medium - voltage cable. Background Technique

[0002] A cable is a wire made of one or more mutually insulated conductors and an outer insulating protective layer, which is laid underground, in the air, etc. A cable generally consists of three parts: a conductor, an insulating layer, and a protective layer, and usually has two types: power cables and control cables. A medium - voltage cable refers to a power cable with a rated voltage between 1 kV and 35 kV, which is used to connect a substation and a distribution network and undertakes the important tasks of energy transmission and signal transmission.

[0003] Chinese Patent Publication No. is CN218299408U, and the authorization announcement date is January 13, 2023. The anti - aging flexible fire - proof sheath soft cable includes an outer sheath, a shielding layer is arranged inside the outer sheath, an inner sheath is arranged inside the shielding layer, a glass - fiber tape is arranged inside the inner sheath, and fire - proof asbestos is arranged inside the glass - fiber tape. The utility model provides an anti - aging flexible fire - proof sheath soft cable. By the combined use of the outer sheath and the inner sheath, the anti - aging performance and electrical insulation performance of the cable are effectively improved. The double - layer protection can prevent puncture, and the outer sheath and the inner sheath are made of polyethylene material and polyvinyl chloride material respectively, which can effectively improve the flexibility of the cable. The structure is simple and practical, and can effectively avoid the problem that the outer wrapping of the cable is easy to bend and fall off after being exposed to wind, sun and rain.

[0004] The existing internal filling material of medium - voltage cables uses rubber material. Rubber is heavy in weight, and the rubber material is prone to aging during long - term use, reducing the protection strength of the cable. Cracking is easy to occur when the cable is bent, resulting in the exposure of the wire core, posing a safety hazard, reducing the service life of the cable, and not meeting the use requirements. Content of the Utility Model

[0005] The purpose of the utility model is to provide an anti - aging light - weight flexible flame - retardant medium - voltage cable to solve the problems mentioned in the above background technique, that is, the existing internal filling material of medium - voltage cables uses rubber material, rubber is heavy in weight, and the rubber material is prone to aging during long - term use, reducing the protection strength of the cable. Cracking is easy to occur when the cable is bent, resulting in the exposure of the wire core, posing a safety hazard, reducing the service life of the cable, and not meeting the use requirements.

[0006] To achieve the above object, the present utility model provides the following technical solution: a weather-resistant, light, flexible, flame-retardant medium-voltage cable, comprising a cable core, the cable core including a conductor core and a filling layer, there are four conductor cores, an external mica tape layer is provided outside the cable core, an inner sheath layer is provided outside the mica tape layer, a tinned copper wire braided layer is provided outside the inner sheath layer, and the tinned copper wire braided layer is adhered to the inner sheath layer, a composite flame-retardant layer is provided outside the tinned copper wire braided layer, and the composite flame-retardant layer is adhered to the tinned copper wire braided layer, an outer sheath is provided outside the composite flame-retardant layer, and the outer sheath and the composite flame-retardant layer are formed by extrusion molding, and an anti-aging coating is coated on the outer wall of the outer sheath.

[0007] Preferably, the conductor core includes a conductor, an insulating layer and a shielding layer, and the conductor is formed by stranding a plurality of copper wires, the insulating layer is provided outside the conductor, the shielding layer is provided outside the insulating layer, and the insulating layer and the shielding layer are sequentially extrusion-molded outside the conductor.

[0008] Preferably, the composite flame-retardant layer includes a first flame-retardant layer and a second flame-retardant layer, and the second flame-retardant layer is provided outside the first flame-retardant layer.

[0009] Preferably, grooves are provided on both the outer wall of the first flame-retardant layer and the inner wall of the second flame-retardant layer, and the grooves on the first flame-retardant layer and the second flame-retardant layer are correspondingly provided.

[0010] Preferably, flexible metal wires are provided inside the outer sheath, there are at least eight flexible metal wires, and the flexible metal wires are integrated with the outer sheath, the flexible metal wires are equidistantly arranged inside the outer sheath, and the flexible metal wires are arranged along the direction of the conductor core.

[0011] Preferably, there are four conductor cores, and the four conductor cores are equidistantly arranged inside the cable core, the filling layer is provided at the gaps between the four conductor cores, and the mica tape layer is spirally wound and connected outside the cable core.

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

[0013] Through the settings of the filling layer, the inner sheath layer, the outer sheath and the anti-aging coating, the filling layer uses a foam filling material, which is a light and non-combustible material with good heat insulation, sound insulation and shock absorption properties, the inner sheath layer and the outer sheath both use polyurethane, and the polyurethane has a light weight, reducing the weight of the medium-voltage cable, the medium-voltage cable has a high tear resistance, maintaining excellent flexural characteristics, and can meet the use in a repeatedly bent environment, the anti-aging coating uses polyvinyl chloride, and polyvinyl chloride has good weather resistance and anti-aging properties, can resist environmental factors such as ultraviolet rays, oxygen and moisture to a certain extent, and can maintain stable performance in extreme environments;

[0014] The utility model device is provided with a composite flame retardant layer and flexible metal wires. The composite flame retardant layer is composed of a first flame retardant layer and a second flame retardant layer to form a double-layer structure. The first flame retardant layer uses aluminum hydroxide inorganic filler. Aluminum hydroxide inorganic matter can decompose to generate water vapor and inert gas at high temperature, thereby diluting the concentration of combustible gas and reducing the flame temperature. The second flame retardant layer uses ceramizable silicone rubber. Ceramizable silicone rubber can rapidly form a hard and dense ceramic-like shell at high temperature. This shell does not melt and does not drip in a fire environment, can effectively isolate the flame, and prevent the spread of fire. During the combustion process, the ceramizable silicone rubber generates very little smoke, and is non-toxic and harmless. The setting of the groove reduces the amount of flame retardant material used, thereby reducing the weight of the medium-voltage cable, and can also play a buffering role. The flexible metal wires increase the structural strength and toughness of the outer sheath, and can prevent cracks from appearing in the outer sheath during repeated bending, improving the use effect of the medium-voltage cable. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0017] Figure 3 is of the present utility model Figure 2 partial enlarged view of area A;

[0018] Figure 4 is a structural diagram of the composite flame retardant layer of the present utility model;

[0019] Figure 5 is a structural diagram of the outer sheath of the present utility model.

[0020] In the figure: 1, cable core; 2, wire core; 3, filling layer; 4, mica tape layer; 5, inner sheath; 6, tinned copper wire braided layer; 7, composite flame retardant layer; 8, outer sheath; 9, flexible metal wire; 10, conductor; 11, insulating layer; 12, shielding layer; 13, first flame retardant layer; 14, second flame retardant layer; 15, groove; 16, anti-aging coating. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.

[0022] Please refer to Figures 1-5, An embodiment provided by the present utility model: A weather-resistant, lightweight, flexible, flame-retardant medium-voltage cable, comprising a cable core 1. The cable core 1 includes a conductor core 2 and a filling layer 3. There are four conductor cores 2. An external mica tape layer 4 is provided outside the cable core 1. An inner sheath 5 is provided outside the mica tape layer 4. An externally tin-plated copper wire braided layer 6 is provided outside the inner sheath 5, and the tin-plated copper wire braided layer 6 is in contact with the inner sheath 5. An external composite flame-retardant layer 7 is provided outside the tin-plated copper wire braided layer 6, and the composite flame-retardant layer 7 is in contact with the tin-plated copper wire braided layer 6. An outer sheath 8 is provided outside the composite flame-retardant layer 7, and the outer sheath 8 and the composite flame-retardant layer 7 are formed by extrusion molding. A weather-resistant coating 16 is coated on the outer wall of the outer sheath 8. The conductor core 2 includes a conductor 10, an insulating layer 11, and a shielding layer 12. The conductor 10 is composed of multiple copper wires stranded together. The insulating layer 11 is provided outside the conductor 10. The shielding layer 12 is provided outside the insulating layer 11, and the insulating layer 11 and the shielding layer 12 are sequentially extrusion-molded outside the conductor 10. There are four conductor cores 2, and the four conductor cores 2 are equidistantly arranged inside the cable core 1. The filling layer 3 is provided at the gaps between the four conductor cores 2. The mica tape layer 4 is spirally wound and connected outside the cable core 1. The filling layer 3 uses a foam filling material, which is a lightweight and non-flammable material with good heat insulation, sound insulation, and shock absorption properties. Both the inner sheath 5 and the outer sheath 8 use polyurethane, and the polyurethane has a light weight, reducing the weight of the medium-voltage cable. The medium-voltage cable has a high tear resistance and maintains excellent flexural characteristics, and can meet the use in a repeatedly bent environment. The weather-resistant coating 16 uses polyvinyl chloride, which has good weather resistance and aging resistance, can resist environmental factors such as ultraviolet rays, oxygen, and moisture to a certain extent, and can maintain stable performance in extreme environments.

[0023] Please refer to Figure 1 and Figure 4 , The composite flame-retardant layer 7 includes a first flame-retardant layer 13 and a second flame-retardant layer 14. The second flame-retardant layer 14 is provided outside the first flame-retardant layer 13. Grooves 15 are provided on both the outer wall of the first flame-retardant layer 13 and the inner wall of the second flame-retardant layer 14, and the grooves 15 on the first flame-retardant layer 13 and the second flame-retardant layer 14 are correspondingly arranged. The first flame-retardant layer 13 uses aluminum hydroxide inorganic filler. Aluminum hydroxide inorganic matter can decompose to produce water vapor and inert gas at high temperature, thereby diluting the concentration of combustible gas and reducing the flame temperature. The second flame-retardant layer 14 uses ceramized silicone rubber. Ceramized silicone rubber can rapidly form a hard and dense ceramic-like shell at high temperature. This shell does not melt and does not drip in a fire environment, can effectively isolate the flame, and prevent the spread of fire. During the combustion process, the ceramized silicone rubber produces very little smoke and is non-toxic and harmless. The setting of the grooves 15 reduces the amount of flame-retardant material used, thereby reducing the weight of the medium-voltage cable, and can also play a buffering role, improving the use effect of the medium-voltage cable.

[0024] Please refer to Figure 1 ,Figure 2 and Figure 5 Inside the outer sheath 8, there are flexible metal wires 9. There are at least eight flexible metal wires 9, and the flexible metal wires 9 are integrated with the outer sheath 8. The flexible metal wires 9 are equidistantly arranged inside the outer sheath 8 and are arranged along the direction of the wire core 2. The flexible metal wires 9 increase the structural strength and toughness of the outer sheath 8, can prevent cracks from appearing on the outer sheath 8 during repeated bending, and improve the use effect of the medium-voltage cable.

[0025] The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0026] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A light-duty, soft, flame-retardant and weather-resistant medium-voltage cable, comprising a cable core (1), characterized in that: The cable core (1) includes a conductor core (2) and a filling layer (3). There are four conductor cores (2). An external mica tape layer (4) is provided on the cable core (1). An inner sheath layer (5) is provided on the external mica tape layer (4). A tinned copper wire braided layer (6) is provided on the external inner sheath layer (5), and the tinned copper wire braided layer (6) is in contact with the inner sheath layer (5). A composite flame retardant layer (7) is provided on the external tinned copper wire braided layer (6), and the composite flame retardant layer (7) is in contact with the tinned copper wire braided layer (6). An outer sheath (8) is provided on the external composite flame retardant layer (7), and the outer sheath (8) and the composite flame retardant layer (7) are formed by extrusion molding. An aging-resistant coating (16) is coated on the outer wall of the outer sheath (8).

2. The light-duty, soft, flame-retardant and medium-voltage cable with anti-aging property according to claim 1, wherein: The conductor core (2) includes a conductor (10), an insulating layer (11), and a shielding layer (12). The conductor (10) is formed by stranding a plurality of copper wires. The insulating layer (11) is provided on the external conductor (10). The shielding layer (12) is provided on the external insulating layer (11), and the insulating layer (11) and the shielding layer (12) are sequentially extrusion-molded on the external conductor (10).

3. A weather-resistant, lightweight, flexible, flame-retardant medium-voltage cable according to claim 1, characterized in that: The composite flame retardant layer (7) includes a first flame retardant layer (13) and a second flame retardant layer (14). The second flame retardant layer (14) is provided on the external first flame retardant layer (13).

4. The light-duty, soft, flame-retardant and medium-voltage cable with anti-aging property according to claim 3, wherein: Grooves (15) are provided on both the outer wall of the first flame retardant layer (13) and the inner wall of the second flame retardant layer (14), and the grooves (15) on the first flame retardant layer (13) and the second flame retardant layer (14) are arranged correspondingly.

5. A weather-resistant, light, flexible, flame-retardant medium-voltage cable according to claim 1, characterized in that: Flexible metal wires (9) are provided inside the outer sheath (8). There are at least eight flexible metal wires (9), and the flexible metal wires (9) and the outer sheath (8) are integrally formed. The flexible metal wires (9) are equidistantly arranged inside the outer sheath (8), and the flexible metal wires (9) are arranged along the direction of the conductor core (2).

6. A weather-resistant, lightweight, flexible, flame-retardant medium-voltage cable according to claim 1, characterized in that: There are four conductor cores (2), and the four conductor cores (2) are equidistantly arranged inside the cable core (1). The filling layer (3) is provided at the gaps between the four conductor cores (2). The mica tape layer (4) is spirally wound and connected on the external cable core (1).

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