Silane crosslinked polyvinyl chloride flame-retardant cable

Abstract

The utility model discloses a silane cross-linked polyvinyl chloride flame-retardant cable, which comprises a cable core, three annularly distributed wire cores are arranged inside the cable core, a composite shielding layer is wrapped outside the cable core, and the composite shielding layer is composed of a conductive layer, an insulation isolation layer and a protection layer. The outer portion of the composite shielding layer is wrapped by a composite flame-retardant layer, the composite flame-retardant layer is composed of a base layer, a heat isolation layer and a reinforcing layer, the outer portion of the composite flame-retardant layer is wrapped by a composite protection layer, and the composite protection layer is composed of an inner protection layer, a waterproof layer, a sheath layer and an anti-ultraviolet layer. The problem that the insulation performance is reduced due to the fact that the insulation material is softened when the cable is in a high-temperature environment for a long time is solved.

Description

Technical Field

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

[0002] Power cables are cables used to transmit and distribute electrical energy and are the backbone line products in power systems. Power cables have a variety of voltage levels and various insulation types to meet different power transmission requirements. Power cables are mainly composed of conductive cores, insulation layers, and protective layers. The conductive core is responsible for transmitting current and must have good conductivity, tensile strength, and elongation. The insulation layer ensures that the current will not leak out when it is transmitted inside the cable, while the protective layer protects the cable from mechanical damage and various environmental factors during laying and operation.

[0003] For example, the Chinese authorized patent "A Power Cable" with announcement number CN218333174U fills the foamed EVA material between the insulating layer and the conductive unit. The filler completely covers the conductive unit, isolates the insulating layer and the conductive unit, blocks the direct contact between the copper conductor and the polyolefin insulating layer, effectively prevents the copper ions in the copper conductor from diffusing into the insulating layer to cause copper damage, and improves the anti-aging ability of the insulating layer.

[0004] During long-term operation, especially in high-temperature environments, the above-mentioned prior art may cause the insulating material to soften or melt, resulting in reduced insulation performance and current leakage. Therefore, it does not meet existing needs. In this regard, we propose a silane cross-linked polyvinyl chloride flame-retardant cable. Utility Model Content

[0005] The utility model aims to provide a silane cross-linked polyvinyl chloride flame retardant cable to solve the problem in the background art that the insulation performance of the cable is easily reduced due to softening of the insulation material when the cable is in a high temperature environment for a long time.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a silane cross-linked polyvinyl chloride flame-retardant cable, comprising a cable core, wherein three annularly distributed wire cores are arranged inside the cable core, and the outside of the cable core is wrapped with a composite shielding layer, wherein the composite shielding layer is composed of a conductive layer, an insulating isolation layer and a protective layer, and the outside of the composite shielding layer is wrapped with a composite flame-retardant layer, wherein the composite flame-retardant layer is composed of a base layer, a thermal isolation layer and a reinforcement layer, and the outside of the composite flame-retardant layer is wrapped with a composite protective layer, wherein the composite protective layer is composed of an inner protective layer, a water-blocking layer, a sheath layer and an anti-ultraviolet layer.

[0007] Preferably, the wire core comprises a conductor, and the conductor is formed by twisting a plurality of copper wires, the outside of the conductor is wrapped with a composite silane cross-linked polyvinyl chloride insulation layer, and the cross section of the wire core is a fan-shaped structure.

[0008] Preferably, the composite silane cross-linked polyvinyl chloride insulation layer includes an insulation base layer, and the insulation base layer is extruded on the outside of the conductor, the insulation base layer is coated with a flame retardant reinforcement layer on the outside, and the flame retardant reinforcement layer is provided with a wear-resistant protective layer on the outside.

[0009] Preferably, the conductive layer is wrapped around the outside of the cable core, the insulating isolation layer is extruded and molded outside the conductive layer, and the protective layer is extruded and molded outside the insulating isolation layer.

[0010] Preferably, the base layer is in contact with the outer wall of the composite shielding layer, the thermal insulation layer is coated on the outside of the base layer, and the reinforcement layer is woven on the outside of the thermal insulation layer.

[0011] Preferably, the outer wall of the inner protective layer and the composite flame retardant layer is formed by extrusion, the water blocking layer is formed by extrusion outside the inner protective layer, the jacket layer is formed by extrusion outside the water blocking layer, and the anti-ultraviolet layer is formed by extrusion outside the jacket layer.

[0012] Preferably, a reinforcing core is arranged at the center of the cable core.

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

[0014] 1. The silane cross-linked polyvinyl chloride material of the utility model has excellent insulation properties, can effectively isolate the conductor from the external environment, prevent current leakage and electromagnetic interference, and the flame retardant reinforcement layer enables the cable to quickly form a carbonized layer when encountering a fire, thereby preventing the spread of flames and reducing the risk of fire. The three-dimensional network structure formed by the silane cross-linking technology gives the insulation layer a higher mechanical strength and can withstand external physical impact and extrusion. The outer wear-resistant protective layer can effectively resist the friction and scratches that the cable may encounter during installation and use, thereby extending the service life of the cable.

[0015] 2. The composite shielding layer of the utility model can effectively isolate external electromagnetic interference signals and protect the transmission quality and stability of the internal signals of the cable. By reducing electromagnetic interference and signal attenuation, the shielding layer can improve the electrical performance of the cable and ensure the accuracy and reliability of data transmission. The setting of the insulating isolation layer can prevent electrical contact between the conductive layer and the insulating layer, reducing the safety hazards of the cable during use.

[0016] 3. The composite flame retardant layer of the utility model adopts a multi-layer structure and flame retardant materials, which can quickly form a flame retardant barrier when the cable encounters a fire, effectively inhibiting the spread of flames and the generation of smoke. The setting of the thermal isolation layer can reduce the transfer of heat to the inside of the cable, reduce the temperature rise rate of the cable in a fire, and protect the safety of the internal structure and electrical components of the cable. The addition of the reinforcement layer improves the mechanical strength and stability of the flame retardant layer, enabling it to withstand external physical impact and extrusion and maintain the integrity of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional diagram of the utility model;

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

[0019] Figure 3 This is a schematic diagram of the structure of the composite silane cross-linked polyvinyl chloride insulation layer of the utility model;

[0020] Figure 4 It is a schematic diagram of the composite shielding layer structure of the utility model;

[0021] Figure 5 This is a schematic diagram of the composite flame retardant layer structure of the utility model;

[0022] Figure 6 This is a schematic diagram of the composite protective layer structure of the utility model.

[0023] In the figure: 1, cable core; 2, wire core; 21, composite silane cross-linked polyvinyl chloride insulation layer; 211, insulation base layer; 212, flame retardant reinforcement layer; 213, wear-resistant protective layer; 22, conductor; 3, reinforcement core; 4, composite shielding layer; 41, conductive layer; 42, insulation isolation layer; 43, protective layer; 5, composite flame retardant layer; 51, base layer; 52, thermal isolation layer; 53, reinforcement layer; 6, composite protective layer; 61, inner protective layer; 62, water-blocking layer; 63, sheath layer; 64, anti-ultraviolet layer. DETAILED DESCRIPTION

[0024] 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.

[0025] See also Figure 1-6The utility model provides an embodiment: a silane cross-linked polyvinyl chloride flame-retardant cable, comprising a cable core 1, wherein three annularly distributed wire cores 2 are arranged inside the cable core 1, and the cable core 1 is wrapped with a composite shielding layer 4 on the outside, and the composite shielding layer 4 is composed of a conductive layer 41, an insulating isolation layer 42 and a protective layer 43, and the composite shielding layer 4 is wrapped with a composite flame-retardant layer 5 on the outside, and the composite flame-retardant layer 5 is composed of a base layer 51, a thermal isolation layer 52 and a reinforcement layer 53, and the composite flame-retardant layer 5 is wrapped with a composite protective layer 6 on the outside, and the composite protective layer 6 is composed of an inner protective layer 61, a water-blocking layer 62, a sheath layer 63 and an anti-ultraviolet layer 64.

[0026] The composition structure and material selection of the composite shielding layer 4 provide the silane cross-linked polyvinyl chloride flame retardant cable with excellent electromagnetic shielding effect and electrical performance, ensuring the safe and reliable operation of the cable. The composite flame retardant layer 5 provides the silane cross-linked polyvinyl chloride flame retardant cable with excellent flame retardant performance and thermal isolation effect. The composite protective layer 6, as its important protective part, needs to have excellent mechanical properties, electrical properties and environmental adaptability.

[0027] See also Figure 2 The core 2 includes a conductor 22, and the conductor 22 is formed by twisting multiple copper wires. The outside of the conductor 22 is wrapped with a composite silane cross-linked polyvinyl chloride insulation layer 21. The cross-section of the core 2 is a fan-shaped structure. The composite silane cross-linked polyvinyl chloride insulation layer 21 provides insulation, flame retardancy, mechanical strength and wear resistance for the silane cross-linked polyvinyl chloride flame retardant cable through composition structure and material selection.

[0028] See also Figure 3 The composite silane cross-linked polyvinyl chloride insulation layer 21 includes an insulation base layer 211, and the insulation base layer 211 is extruded on the outside of the conductor 22. The outside of the insulation base layer 211 is coated with a flame retardant reinforcement layer 212, and the outside of the flame retardant reinforcement layer 212 is provided with a wear-resistant protective layer 213. The insulation base layer 211 and the wear-resistant protective layer 213 are both silane cross-linked polyvinyl chloride resins. Through the silane cross-linking technology, a high-density three-dimensional network structure is formed, which has excellent insulation performance, heat resistance and mechanical strength, and provides basic insulation protection for the conductor. The flame retardant reinforcement layer 212 is zinc borate, which can absorb heat and decompose at high temperature to release water vapor to dilute the combustible gas, thereby playing a flame retardant role.

[0029] See also Figure 4The conductive layer 41 is wrapped around the outside of the cable core 1, the insulating isolation layer 42 is extruded on the outside of the conductive layer 41, and the protective layer 43 is extruded on the outside of the insulating isolation layer 42. The conductive layer 41 is a copper tape to form a continuous conductive shielding network to effectively isolate external electromagnetic interference signals. The insulating isolation layer 42 is silane cross-linked polyvinyl chloride to prevent electrical contact between the conductive layer and the insulating layer to ensure the safe operation of the cable. The protective layer 43 is polyvinyl chloride to protect the integrity and stability of the shielding layer.

[0030] See also Figure 5 The base layer 51 is in contact with the outer wall of the composite shielding layer 4, the thermal insulation layer 52 is coated on the outside of the base layer 51, and the reinforcement layer 53 is woven on the outside of the thermal insulation layer 52. The base layer 51 is a ceramic polymer, forming the first flame retardant barrier of the cable. The thermal insulation layer 52 is expanded graphite to reduce the transfer of heat to the inside of the cable and reduce the temperature rise rate of the cable in a fire. The reinforcement layer 53 is glass fiber, which can improve the mechanical strength and tensile strength of the flame retardant layer.

[0031] See also Figure 6 The inner protective layer 61 and the outer wall of the composite flame retardant layer 5 are formed by extrusion, the water-blocking layer 62 is formed by extrusion on the outside of the inner protective layer 61, the sheath layer 63 is formed by extrusion on the outside of the water-blocking layer 62, and the anti-ultraviolet layer 64 is formed by extrusion on the outside of the sheath layer 63. The inner protective layer 61 is cross-linked polyethylene, which mainly plays a role in protecting the insulating layer and preventing corrosion by moisture and chemicals. The water-blocking layer 62 is polyamide, which is used to prevent external moisture from entering the cable and ensure the stability of the electrical performance of the cable. The sheath layer 63 is polypropylene, which has excellent mechanical strength and wear resistance and can resist external physical impact and friction. The anti-ultraviolet layer 64 is polyvinylidene fluoride, which can effectively prevent ultraviolet damage to the cable.

[0032] See also Figure 1 A reinforcing core 3 is arranged at the center of the cable core 1.

[0033] 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 silane cross-linked polyvinyl chloride flame retardant cable, comprising a cable core (1), characterized in that: The cable core (1) is provided with three annularly distributed wire cores (2) inside, the cable core (1) is wrapped with a composite shielding layer (4) outside, the composite shielding layer (4) is composed of a conductive layer (41), an insulating isolation layer (42) and a protective layer (43), the composite shielding layer (4) is wrapped with a composite flame retardant layer (5) outside, the composite flame retardant layer (5) is composed of a base layer (51), a thermal isolation layer (52) and a reinforcement layer (53), the composite flame retardant layer (5) is wrapped with a composite protective layer (6) outside, the composite protective layer (6) is composed of an inner protective layer (61), a water-blocking layer (62), a sheath layer (63) and an anti-ultraviolet layer (64).

2. A silane cross-linked polyvinyl chloride flame retardant cable according to claim 1, characterized in that: The wire core (2) comprises a conductor (22), and the conductor (22) is formed by twisting a plurality of copper wires. The conductor (22) is wrapped with a composite silane cross-linked polyvinyl chloride insulation layer (21) on the outside, and the cross section of the wire core (2) is a fan-shaped structure.

3. A silane cross-linked polyvinyl chloride flame retardant cable according to claim 2, characterized in that: The composite silane cross-linked polyvinyl chloride insulation layer (21) comprises an insulation base layer (211), and the insulation base layer (211) is extruded and molded on the outside of the conductor (22), the insulation base layer (211) is coated with a flame retardant reinforcement layer (212) on the outside, and the flame retardant reinforcement layer (212) is provided with a wear-resistant protective layer (213) on the outside.

4. The silane cross-linked polyvinyl chloride flame retardant cable according to claim 1, characterized in that: The conductive layer (41) is wrapped around the outside of the cable core (1), the insulating isolation layer (42) is extruded and molded outside the conductive layer (41), and the protective layer (43) is extruded and molded outside the insulating isolation layer (42).

5. The silane cross-linked polyvinyl chloride flame retardant cable according to claim 1, characterized in that: The base layer (51) is in contact with the outer wall of the composite shielding layer (4); the thermal insulation layer (52) is coated on the outside of the base layer (51); and the reinforcement layer (53) is woven on the outside of the thermal insulation layer (52).

6. The silane cross-linked polyvinyl chloride flame retardant cable according to claim 1, characterized in that: The inner protective layer (61) and the outer wall of the composite flame retardant layer (5) are formed by extrusion, the water blocking layer (62) is formed by extrusion on the outside of the inner protective layer (61), the jacket layer (63) is formed by extrusion on the outside of the water blocking layer (62), and the anti-ultraviolet layer (64) is formed by extrusion on the outside of the jacket layer (63).

7. The silane cross-linked polyvinyl chloride flame retardant cable according to claim 1, characterized in that: A reinforcing core (3) is arranged at the center of the cable core (1).

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