Outdoor flame-retardant cable

Abstract

The utility model belongs to the technical field of cables, and particularly relates to an outdoor flame-retardant cable, which comprises a cable core, the cable core is made of copper or aluminum metal, the outer layer of the cable core is wrapped with an insulating layer, the insulating layer is made of ceramic silicone rubber, the outer layer of the insulating layer is provided with a shielding layer, the shielding layer is of a composite braided structure, the outside of the shielding layer is provided with a composite oxygen barrier layer, and the outer layer of the composite oxygen barrier layer is provided with a flame-retardant layer. A filling layer is arranged between the composite oxygen barrier layer and the shielding layer, an armor layer is arranged on the outer layer of the composite oxygen barrier layer, the armor layer is a stainless steel band or an alloy steel wire, and an outer sheath is arranged outside the armor layer. According to the utility model, material selection of the wire cores guarantees electric conduction, the insulating layer is resistant to high temperature, flame retardant and reliable in insulation, the shielding layer is efficient and anti-interference, the filling layer assists in flame retardance and stabilizes the structure, the composite oxygen barrier layer is strong in oxygen barrier and flame retardant, the armor layer enhances mechanical protection, and the outer sheath has flame retardance and weather resistance. The cable can transmit signals safely and stably, prolongs the service life, and is widely applied to various fields.

Description

Technical Field

[0001] This utility model relates to the field of cable technology, specifically to an outdoor flame-retardant cable. Background Technology

[0002] In modern society, outdoor cables are used in a wide range of applications, including power transmission, communication networks, and security monitoring. Due to the complex and variable outdoor environment, cables face various potential risks, such as fire, mechanical damage, ultraviolet radiation, and chemical corrosion. Therefore, outdoor cables with good flame-retardant properties are crucial for protecting life and property and ensuring the stable operation of communication and power systems.

[0003] Inadequacies of existing outdoor cables:

[0004] Limited flame retardant properties: Traditional outdoor cables often use a single flame-retardant material or structure, which is insufficient to meet increasingly stringent flame retardant requirements. For example, although the insulation layer and outer sheath of some cables have a certain degree of flame retardancy, they may still burn and spread when exposed to a large fire, leading to serious consequences.

[0005] Insufficient mechanical strength: In outdoor environments, cables may be subjected to various mechanical forces, such as tension, compression, and bending. Some existing cables lack sufficient mechanical strength, making them easily damaged and affecting their service life and performance.

[0006] Poor anti-interference capability: With the widespread use of electronic devices, electromagnetic interference has become an increasingly prominent problem. The shielding design of some outdoor cables is inadequate, failing to effectively resist external electromagnetic interference, leading to unstable signal transmission or errors.

[0007] Weather resistance needs improvement: Outdoor cables are exposed to the natural environment for extended periods, needing to withstand factors such as sunlight, rain, and temperature changes. Existing cables have certain limitations in terms of weather resistance, and are prone to aging, cracking, and embrittlement, reducing their reliability and service life. Utility Model Content

[0008] (a) Technical problems to be solved

[0009] In view of the shortcomings of the prior art, this utility model provides an outdoor flame-retardant cable, which solves the problems mentioned in the background art.

[0010] (II) Technical Solution

[0011] To achieve the above objectives, this utility model specifically adopts the following technical solution:

[0012] An outdoor flame-retardant cable includes a core made of copper or aluminum, an insulation layer made of ceramicized silicone rubber, a shielding layer with a composite braided structure, a composite oxygen barrier layer outside the shielding layer, a filler layer between the composite oxygen barrier layer and the shielding layer, an armor layer made of stainless steel strip or alloy steel wire outside the composite oxygen barrier layer, and an outer sheath made of a low-smoke halogen-free flame-retardant polyolefin or polyvinyl chloride polymer matrix with added antioxidants.

[0013] Furthermore, the composite braided structure is formed by adding an aluminum foil layer on top of copper wire braiding.

[0014] Furthermore, the composite oxygen barrier layer is formed by sandwiching a layer of metal foil or ceramic fiber cloth in the middle of a low-smoke halogen-free polyolefin oxygen barrier layer, thus forming a composite oxygen barrier structure.

[0015] Furthermore, the filling layer is aluminum hydroxide filled rope or ceramic fiber filled strip.

[0016] Furthermore, the filler layer has a fill rate of 80% to ensure that the position of the insulated core is well fixed, while adapting to the deformation and stress changes of the cable under different environments.

[0017] Furthermore, the copper wire braiding density of the shielding layer is 90 wires per square centimeter, and the aluminum foil thickness is 0.1 mm, in order to achieve a highly efficient shielding effect.

[0018] (III) Beneficial Effects

[0019] Compared with the prior art, this utility model provides an outdoor flame-retardant cable with the following advantages:

[0020] This utility model features a core material that ensures conductivity, an insulation layer that is high-temperature resistant, flame-retardant, and reliably insulating, a shielding layer that effectively resists interference, a filling layer that assists in flame retardancy and stabilizes the structure, a composite oxygen barrier layer that provides strong oxygen isolation and flame retardancy, an armor layer that enhances mechanical protection, and an outer sheath that combines flame retardancy and weather resistance. The overall structural design enables the cable to transmit signals safely and stably in complex outdoor environments, extending its service life and making it widely applicable to various fields. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0022] Figure 2 This is a side view of the structure of this utility model.

[0023] In the diagram: 1. Core wire; 2. Insulation layer; 3. Shielding layer; 4. Filler layer; 5. Composite oxygen barrier layer; 6. Armor layer; 7. Outer sheath. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Example

[0026] like Figure 1-2 As shown, an outdoor flame-retardant cable according to one embodiment of the present invention includes a wire core 1;

[0027] Core 1 is made of copper or aluminum.

[0028] As the core component of current transmission, copper or aluminum utilizes their excellent conductivity to achieve efficient transmission of electrical energy or signals. Copper has high conductivity, good mechanical strength, and corrosion resistance; aluminum is relatively lightweight and inexpensive, making it suitable for applications where weight and cost are critical.

[0029] The insulation layer 2 is made of ceramicized silicone rubber and is wrapped around the outer layer of the core 1.

[0030] Ceramicized silicone rubber has good insulation properties at room temperature, which can effectively prevent current leakage and ensure the electrical safety of cables. In high-temperature environments, it can quickly transform into a hard ceramic body, which can play a role in heat insulation, high temperature resistance and preventing the spread of flames, further enhancing the flame retardant properties of cables, protecting the core from high temperature damage and maintaining the normal function of cables.

[0031] The shielding layer 3 is a composite braided structure, which is an additional layer of aluminum foil on top of copper wire braiding. The copper wire braiding density is 90 strands per square centimeter, and the aluminum foil thickness is 0.1 mm.

[0032] The copper wire braid layer and the aluminum foil layer work together to provide excellent shielding performance. The copper wire braid layer has good conductivity, which can effectively absorb and conduct external electromagnetic interference, preventing it from entering the cable and affecting signal transmission; the aluminum foil layer further enhances the shielding effect, especially providing good blocking of high-frequency electromagnetic interference, while also playing a certain role in moisture protection, ensuring the stability and accuracy of signal transmission inside the cable.

[0033] The filling layer 4 is composed of aluminum hydroxide filling rope or ceramic fiber filling strip, with a filling rate of 80%, and is located between the shielding layer 3 and the composite oxygen barrier layer 5.

[0034] The main function of the filler layer 4 is to fill the gaps inside the cable, fix the position of the insulated core 1, prevent the core 1 from moving and rubbing against each other inside the cable, and ensure the stability of the cable structure. When the aluminum hydroxide filler rope and ceramic fiber filler strip are exposed to high temperature, they will decompose, absorb heat and release non-flammable gas, playing an auxiliary role in flame retardancy. In addition, the filler layer 4 can also enhance the compressive strength of the cable to a certain extent and adapt to the deformation and stress changes of the cable in different environments.

[0035] The composite oxygen barrier layer 5 consists of a metal foil or ceramic fiber cloth sandwiched between the low-smoke halogen-free polyolefin oxygen barrier layer, forming a composite oxygen barrier structure.

[0036] The low-smoke halogen-free polyolefin oxygen barrier layer itself has certain oxygen barrier and flame retardant properties, which can reduce the generation of smoke and harmful gases during combustion. The metal foil or ceramic fiber cloth sandwiched in the middle further enhances the oxygen barrier effect, preventing oxygen from entering the cable interior, slowing down or preventing the further development of combustion, and improving the flame retardant performance of the cable. At the same time, the metal foil can also play a certain shielding role, while the ceramic fiber cloth has good high temperature resistance and heat insulation properties, protecting the internal structure of the cable from high temperature damage.

[0037] The armor layer 6 is made of stainless steel strip or alloy steel wire and is set on the outer layer of the composite oxygen barrier layer 5.

[0038] Stainless steel strips or alloy steel wires have high mechanical strength and tensile and compressive strength, which can effectively protect the internal structure of the cable from damage by external mechanical forces. For example, when buried, they can prevent the cable from being squeezed or scratched by hard objects in the soil, and when laid overhead, they can resist the external forces caused by natural factors such as wind, sun and rain. At the same time, the armor layer 6 can also enhance the tensile performance of the cable, making it suitable for installation environments that need to withstand a certain amount of tension, extending the service life of the cable, and improving the safety and reliability of the cable.

[0039] The outer sheath 7 is a polymer matrix of low-smoke halogen-free flame-retardant polyolefin and polyvinyl chloride with added antioxidants, which is wrapped around the armor layer 6.

[0040] The low-smoke, halogen-free, flame-retardant polyolefin or polyvinyl chloride polymer matrix itself has certain flame-retardant properties, which can prevent the spread of flames and reduce fire losses in the event of a fire. After the addition of antioxidants, the outer sheath 7 has good weather resistance and can resist the effects of ultraviolet radiation, oxidation and chemical corrosion in the outdoor environment, preventing the sheath from aging and cracking, and extending the service life of the cable in the outdoor environment. As the outermost layer of the cable, the outer sheath 7 is in direct contact with the outside world and can also protect the internal structure from mechanical damage, moisture and water, and ensure the stability of the overall performance of the cable.

[0041] Working principle

[0042] When outdoor flame-retardant cables are in operation, current is transmitted through core 1. The copper or aluminum core 1, with its excellent conductivity, ensures efficient conduction of electrical energy or signals. The ceramicized silicone rubber of the insulation layer 2 tightly wraps around core 1, providing reliable insulation under normal conditions and preventing current leakage. In the event of a high-temperature environment, such as a fire, it rapidly ceramicizes to form a hard heat-insulating layer, protecting the core and preventing the flame from spreading inward. The composite braided structure of the shielding layer 3, in which the copper wire braid layer and the aluminum foil layer work together, absorbs and conducts external electromagnetic interference, while the aluminum foil layer enhances the high-frequency shielding effect, jointly ensuring that the internal signal transmission of the cable is not affected by external electromagnetic interference and maintaining signal stability. The filling layer 4 not only fixes the position of the insulated core 1, preventing movement and friction, but also, at high temperatures, its aluminum hydroxide filling rope or ceramicized fiber filling strip decomposes, absorbs heat, and releases non-combustible gases, assisting in flame retardancy, while adapting to the deformation stress of the cable under different environments. The composite oxygen barrier layer 5, through a low-smoke halogen-free polyolefin oxygen barrier layer and an intermediate metal foil or ceramic fiber cloth, effectively prevents oxygen from entering, slows down the combustion process, and provides auxiliary shielding with the metal foil and high-temperature insulation with the ceramic fiber cloth. The armor layer 6, with its stainless steel strip or alloy steel wire, provides strong mechanical protection for the cable, resisting external mechanical damage and ensuring the cable's structural integrity in complex environments. The outer sheath 7, with its low-smoke halogen-free flame-retardant polyolefin or polyvinyl chloride polymer matrix and antioxidants, endows the cable with flame-retardant, weather-resistant, and moisture-proof properties, providing long-term protection for the internal structure and enabling the cable to operate stably in complex outdoor environments, ensuring the normal operation of power transmission, communication networks, and other systems.

[0043] like Figure 2 As shown, in some embodiments, the composite braided structure is formed by adding an aluminum foil layer on top of copper wire braiding; it has both a certain strength and provides a good shielding effect.

[0044] like Figure 1 As shown, in some embodiments, the composite oxygen barrier layer 5 is formed by sandwiching a metal foil or ceramic fiber cloth in the middle of a low-smoke halogen-free polyolefin oxygen barrier layer to form a composite oxygen barrier structure; the low-smoke halogen-free polyolefin oxygen barrier layer has a certain degree of flexibility and oxygen barrier performance, and can play a certain role in blocking oxygen under normal conditions; the metal foil has good oxygen barrier properties and certain metal shielding characteristics, and its continuous metal structure can effectively block the passage of oxygen molecules; the ceramic fiber cloth has excellent high temperature resistance and heat insulation properties, and can maintain structural stability in high temperature environments, preventing the transfer of heat and oxygen.

[0045] like Figure 1As shown, in some embodiments, the filling layer 4 is an aluminum hydroxide filling rope or a ceramic fiber filling strip; the aluminum hydroxide filling rope has a certain degree of flexibility and filling ability, and can adapt well to the shape of the internal space of the cable; the ceramic fiber filling strip has high strength and high temperature resistance, and its fibrous structure can provide a certain support while filling.

[0046] like Figure 2 As shown, in some embodiments, the filling layer 4 has a filling rate of 80% to ensure that the position of the insulated core 1 is well fixed, while adapting to the deformation and stress changes of the cable in different environments; this means that in the gap space inside the cable, the filling material occupies most of the space, and the remaining 20% ​​or so of space provides a certain buffer margin.

[0047] like Figure 2 As shown, in some embodiments, the copper wire braiding density of the shielding layer 3 is 90 wires per square centimeter, and the aluminum foil thickness is 0.1 mm, to achieve a highly efficient shielding effect; this high-density braiding structure forms a fine and continuous metal mesh. Each copper wire is in close contact with each other, with almost no obvious gaps, forming a relatively closed conductive path.

[0048] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the 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 make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An outdoor flame-retardant cable, comprising a conductor (1), characterized in that: The core (1) is made of copper or aluminum metal. The core (1) is wrapped with an insulation layer (2), which is ceramicized silicone rubber. The insulation layer (2) is surrounded by a shielding layer (3), which is a composite braided structure. The shielding layer (3) is surrounded by a composite oxygen barrier layer (5). A filling layer (4) is provided between the composite oxygen barrier layer (5) and the shielding layer (3). The composite oxygen barrier layer (5) is surrounded by an armor layer (6), which is stainless steel strip or alloy steel wire. The armor layer (6) is surrounded by an outer sheath (7), which is a polymer matrix of low-smoke halogen-free flame-retardant polyolefin and polyvinyl chloride formed by adding antioxidants.

2. The outdoor flame-retardant cable according to claim 1, characterized in that: The composite braided structure is formed by adding an aluminum foil layer on top of copper wire braiding.

3. The outdoor flame-retardant cable according to claim 1, characterized in that: The composite oxygen barrier layer (5) is formed by sandwiching a layer of metal foil or ceramic fiber cloth in the middle of the low smoke halogen-free polyolefin oxygen barrier layer to form a composite oxygen barrier structure.

4. The outdoor flame-retardant cable according to claim 1, characterized in that: The filling layer (4) is an aluminum hydroxide filling rope or a ceramic fiber filling strip.

5. An outdoor flame-retardant cable according to claim 1, characterized in that: The filling layer (4) has a filling rate of 80% to ensure that the position of the insulated core is well fixed, while adapting to the deformation and stress changes of the cable under different environments.

6. An outdoor flame-retardant cable according to claim 2, characterized in that: The shielding layer (3) has a copper wire braiding density of 90 wires per square centimeter and an aluminum foil thickness of 0.1 mm to achieve a high-efficiency shielding effect.

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