Cross-linked polyethylene insulated steel tape armored polyvinyl chloride sheath flame-retardant power cable

Abstract

The utility model discloses a cross-linked polyethylene insulated steel tape armored polyvinyl chloride sheath flame-retardant power cable, which comprises a cable core, the cable core comprises a wire core and a filling layer, a mica tape layer is arranged outside the cable core, the mica tape layer is attached to the cable core, an outer shielding layer is arranged outside the mica tape layer, and an inner shielding layer is arranged outside the outer shielding layer. The outer shielding layer is arranged outside the mica tape layer and attached to the mica tape layer, the composite flame-retardant layer is arranged outside the outer shielding layer and attached to the outer shielding layer, the armor layer is arranged outside the composite flame-retardant layer, the outer sheath is arranged outside the armor layer, and the outer sheath and the armor layer are formed through extrusion. The jacket of the power cable is made of polyvinyl chloride, and the flame-retardant layer on the inner side of the cable is of a multi-layer structure, so that the flame-retardant performance of the cable is greatly improved, normal use of the power cable can be ensured under high temperature or fire conditions, and the use effect of the power cable is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power cables, in particular to a cross-linked polyethylene insulated steel tape armored polyvinyl chloride sheathed flame-retardant power cable. Background Technique

[0002] A cable refers to a wire made of one or more mutually insulated conductors and an outer insulating protective layer, which transmits electricity or information from one place to another. The basic structure of a power cable consists of four parts: a conductor core, an insulating layer, a shielding layer, and a protective layer. A power cable is a cable product used to transmit and distribute high-power electric energy in the main lines of a power system, and is commonly used in urban underground power grids, outgoing lines from power stations, internal power supply in industrial and mining enterprises, and underwater power transmission across rivers and seas. In power lines, the proportion of cables is gradually increasing. A power cable is a cable product used to transmit and distribute high-power electric energy in the main lines of a power system.

[0003] The Chinese patent publication number is CN215770602U, and the authorization announcement date is February 8, 2022. The cross-linked polyethylene insulated steel tape armored polyvinyl chloride sheathed flame-retardant power cable includes a main body component, a protection component, and a compression resistance component: the main body component includes a first cross-linked polyethylene insulating layer, a heat insulation plate, a conductor, and a second cross-linked polyethylene insulating layer; a protection component is sleeved outside the first cross-linked polyethylene insulating layer; a compression resistance component is arranged inside the protection component; when the power cable of the utility model is mechanically pressed, the pressure first squeezes the first compression layer, the first compression layer squeezes the second connecting plate through a plurality of connecting rods, the second connecting plate is connected to the first connecting plate, the first connecting plate is connected to the second compression layer, and the shapes of the first connecting plate and the second connecting plate are both arc-shaped, with good compression resistance effect. Coupled with the steel tape armor layer, the compression resistance performance of this power cable is greatly improved, meeting people's needs.

[0004] Existing power cables use polyvinyl chloride sheaths as flame-retardant layers. The flame-retardant performance of the cables is single, and the flame-retardant performance drops significantly under high temperature or fire conditions, which will affect the normal use of the cables, reduce the use effect of power cables, and cannot meet the use requirements. Content of the Utility Model

[0005] The purpose of the utility model is to provide a cross-linked polyethylene insulated steel tape armored polyvinyl chloride sheathed flame-retardant power cable to solve the problem raised in the above background technique that existing power cables use polyvinyl chloride sheaths as flame-retardant layers, the flame-retardant performance of the cables is single, the flame-retardant performance drops significantly under high temperature or fire conditions, which will affect the normal use of the cables, reduce the use effect of power cables, and cannot meet the use requirements.

[0006] To achieve the above object, the present utility model provides the following technical solutions: a cross-linked polyethylene insulated steel tape armored polyvinyl chloride sheathed flame-retardant power cable, comprising a cable core, wherein the cable core includes a conductor core and a filling layer. An external mica tape layer is provided outside the cable core and is in contact with the cable core. An external shielding layer is provided outside the mica tape layer and is in contact with the mica tape layer. A composite flame-retardant layer is provided outside the external shielding layer and is in contact with the external shielding layer. An armored layer is provided outside the composite flame-retardant layer. An outer sheath is provided outside the armored layer, and the outer sheath and the armored layer are formed by extrusion molding.

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

[0008] Preferably, a filling rope is provided inside the filling layer. There are three filling ropes, and the three filling ropes are equidistantly arranged inside the filling layer. The filling ropes are arranged parallel to the conductor core.

[0009] Preferably, the composite flame-retardant layer includes a fireproof layer, a first flame-retardant layer, and a second flame-retardant layer. The first flame-retardant layer is provided outside the fireproof layer, and the fireproof layer is in contact with the external shielding layer. The second flame-retardant layer is provided outside the first flame-retardant layer.

[0010] Preferably, the armored layer includes a steel tape layer and an aluminum foil layer. The aluminum foil layer is provided outside the steel tape layer, and the steel tape layer is in contact with the second flame-retardant layer.

[0011] Preferably, there are three conductor cores, and the three conductor cores are circularly and equidistantly arranged inside the cable core. The filling layer is provided at the gaps between the three conductor cores. 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] The utility model device is provided with a composite flame retardant layer, which is composed of a fireproof layer, a first flame retardant layer and a second flame retardant layer to form a multi-layer structure. The fireproof layer is made of fiberglass cloth. Fiberglass is an inorganic non-metallic material with good fireproof effect. The first flame retardant layer is made of ceramized silicone rubber, which has excellent fireproof, flame retardant, low smoke and non-toxic properties. At high temperature, the ceramized powder will react with the silicone rubber to form a self-supporting ceramic body, thus playing a fireproof role and not generating toxic waste gas or harmful solution, avoiding secondary pollution to the surrounding environment after a fire. The second flame retardant layer is made of inorganic hydroxide flame retardant. When heated, the inorganic hydroxide will decompose and release water vapor, absorb heat and reduce the material temperature. At the same time, the generated metal oxide can cover the surface of the material, isolate oxygen, prevent combustion and improve the flame retardant performance of the cable;

[0014] The utility model device is provided with a filling rope. The filling rope increases the structural strength of the cable core and plays an anti-fracture effect when the cable is bent. 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 armor layer of the present utility model.

[0020] In the figure: 1, cable core; 2, conductor core; 3, filling layer; 4, filling rope; 5, mica tape layer; 6, outer shielding layer; 7, composite flame retardant layer; 8, armor layer; 9, outer sheath; 10, conductor; 11, inner shielding layer; 12, insulating layer; 13, fireproof layer; 14, first flame retardant layer; 15, second flame retardant layer; 16, steel strip layer; 17, aluminum foil layer. Detailed Embodiments

[0021] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying 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 cross-linked polyethylene insulated steel tape armored polyvinyl chloride sheathed flame-retardant power cable, comprising a cable core 1, the cable core 1 includes a conductor core 2 and a filling layer 3, an external mica tape layer 5 is provided outside the cable core 1, and the mica tape layer 5 is in contact with the cable core 1. There are three conductor cores 2, and the three conductor cores 2 are arranged equidistantly in a circular shape inside the cable core 1. The filling layer 3 is arranged at the gaps between the three conductor cores 2. The mica tape layer 5 is spirally wound and connected outside the cable core 1. An external shielding layer 6 is provided outside the mica tape layer 5, and the external shielding layer 6 is in contact with the mica tape layer 5. A composite flame-retardant layer 7 is provided outside the external shielding layer 6, and the composite flame-retardant layer 7 is in contact with the external shielding layer 6. An armored layer 8 is provided outside the composite flame-retardant layer 7. An outer sheath 9 is provided outside the armored layer 8, and the outer sheath 9 and the armored layer 8 are formed by extrusion molding. The outer sheath 9 is made of polyvinyl chloride, is not easily combustible, has good flame retardancy, and can maintain stable performance at high temperatures.

[0023] Please refer to Figure 1 、 Figure 2 and Figure 3 , the conductor core 2 includes a conductor 10, an inner shielding layer 11 and an insulating layer 12, and the conductor 10 is formed by stranding multiple copper wires. The inner shielding layer 11 is provided outside the conductor 10, and the insulating layer 12 is provided outside the inner shielding layer 11. The conductor 10, the inner shielding layer 11 and the insulating layer 12 are formed by extrusion molding. Filling ropes 4 are provided inside the filling layer 3. There are three filling ropes 4, and the three filling ropes 4 are arranged equidistantly inside the filling layer 3. The filling ropes 4 are arranged parallel to the conductor core 2. The insulating layer 12 is made of cross-linked polyethylene. By physical or chemical methods, cross-linking bonds are formed between the linear macromolecular chains of polyethylene, thereby changing its molecular structure to form a three-dimensional network structure, so that the molecules cannot displace, and it has good insulation and flame retardant properties. The filling ropes 4 increase the structural strength of the cable core 1 and play an anti-fracture effect when the cable is bent.

[0024] Please refer to Figure 1 、 Figure 4 and Figure 5, the composite flame retardant layer 7 includes a fireproof layer 13, a first flame retardant layer 14 and a second flame retardant layer 15. The first flame retardant layer 14 is disposed outside the fireproof layer 13, and the fireproof layer 13 is adhered to the outer shielding layer 6. The second flame retardant layer 15 is disposed outside the first flame retardant layer 14. The armor layer 8 includes a steel strip layer 16 and an aluminum foil layer 17. The aluminum foil layer 17 is disposed outside the steel strip layer 16, and the steel strip layer 16 is adhered to the second flame retardant layer 15. The fireproof layer 13 is made of fiberglass cloth. Fiberglass is an inorganic non-metallic material with good fireproof effect. The first flame retardant layer 14 is made of ceramized silicone rubber. Ceramized silicone rubber has excellent fireproof, flame retardant, low smoke, non-toxic and other properties. At high temperatures, the ceramized powder will react with the silicone rubber to form a self-supporting ceramic body, thus playing a fireproof role and not generating toxic waste gas or harmful solution, avoiding secondary pollution to the surrounding environment after a fire. The second flame retardant layer 15 is made of inorganic hydroxide flame retardant. Inorganic hydroxide will decompose and release water vapor when heated, absorb heat and reduce the material temperature. At the same time, the generated metal oxide can cover the surface of the material, isolate oxygen, prevent combustion and improve the flame retardant performance of the 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, those of ordinary skill in the art can understand 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. Flame-retardant power cable with cross-linked polyethylene insulation, steel tape armor and polyvinyl chloride sheath, comprising a cable core (1), characterized in that: The cable core (1) includes a conductor core (2) and a filling layer (3). An external mica tape layer (5) is provided on the cable core (1), and the mica tape layer (5) is in contact with the cable core (1). An external shielding layer (6) is provided on the outside of the mica tape layer (5), and the external shielding layer (6) is in contact with the mica tape layer (5). A composite flame retardant layer (7) is provided on the outside of the external shielding layer (6), and the composite flame retardant layer (7) is in contact with the external shielding layer (6). An armor layer (8) is provided on the outside of the composite flame retardant layer (7). An outer sheath (9) is provided on the outside of the armor layer (8), and the outer sheath (9) and the armor layer (8) are formed by extrusion.

2. The flame-retardant power cable with cross-linked polyethylene insulation, steel tape armor and PVC sheath according to claim 1, characterized in that: The conductor core (2) includes a conductor (10), an inner shielding layer (11), and an insulating layer (12). The conductor (10) is formed by stranding a plurality of copper wires. The inner shielding layer (11) is provided on the outside of the conductor (10). The insulating layer (12) is provided on the outside of the inner shielding layer (11). The conductor (10), the inner shielding layer (11), and the insulating layer (12) are formed by extrusion.

3. The flame-retardant power cable with cross-linked polyethylene insulation, steel tape armoring and PVC sheath according to claim 1, characterized in that: A filling rope (4) is provided inside the filling layer (3). There are three filling ropes (4), and the three filling ropes (4) are equidistantly arranged inside the filling layer (3). The filling rope (4) is arranged parallel to the conductor core (2).

4. The flame-retardant power cable with cross-linked polyethylene insulation, steel tape armor and PVC sheath according to claim 1, characterized in that: The composite flame retardant layer (7) includes a fireproof layer (13), a first flame retardant layer (14), and a second flame retardant layer (15). The first flame retardant layer (14) is provided on the outside of the fireproof layer (13), and the fireproof layer (13) is in contact with the external shielding layer (6). The second flame retardant layer (15) is provided on the outside of the first flame retardant layer (14).

5. The flame-retardant power cable with cross-linked polyethylene insulation, steel tape armoring and PVC sheath according to claim 1, characterized in that: The armor layer (8) includes a steel tape layer (16) and an aluminum foil layer (17). The aluminum foil layer (17) is provided on the outside of the steel tape layer (16), and the steel tape layer (16) is in contact with the second flame retardant layer (15).

6. The flame-retardant power cable with cross-linked polyethylene insulation, steel tape armor and PVC sheath according to claim 1, characterized in that: There are three conductor cores (2), and the three conductor cores (2) are circularly and equidistantly arranged inside the cable core (1). The filling layer (3) is provided at the gaps between the three conductor cores (2). The mica tape layer (5) is spirally wound and connected outside the cable core (1).

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