Twisted-pair low-smoke halogen-free shielding wire

Abstract

The utility model provides a twisted-pair low-smoke halogen-free shielded wire, which relates to the technical field of shielded wires and comprises an outer sheath layer, and a flame-retardant layer is arranged on the inner surface wall of the outer sheath layer. According to the utility model, the flame-retardant layer is mainly made of the polyethylene material, although the polyethylene material is not a traditional flame-retardant material, the flame-retardant performance of the flame-retardant layer can be improved by adding a specific flame retardant, and the flame retardant can absorb a large amount of heat and reduce the combustion temperature in the combustion process, so that the flame-retardant performance of the flame-retardant layer is improved. Meanwhile, generated water vapor and metal oxide can further inhibit flame spreading, the functional layer is mainly made of a low-smoke halogen-free polyolefin material, the amount of smoke generated during combustion of low-smoke halogen-free polyolefin is small, visibility can be rapidly reduced, and therefore the influence of the smoke on personnel evacuation and rescue work when a fire disaster happens is reduced, and the service life of the fire disaster is prolonged. And moreover, the low-smoke halogen-free polyolefin releases less toxic gas during combustion, so that the harm of a fire disaster to the health of people can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of shielded wires, in particular to a twisted low-smoke halogen-free shielded wire. Background Art

[0002] With the rapid development of modern technology, wire and cable, as a key component connecting various electronic devices and systems, its performance and quality have been increasingly emphasized by people. Especially in the fields of communication, computer network, control system, power transmission, and various industrial and commercial buildings, wire and cable not only need to have efficient and stable signal transmission capabilities, but also need to meet the requirements of safety, environmental protection, and durability. In such a background, the twisted low-smoke halogen-free shielded wire, as a new type of special cable, has gradually emerged and become an indispensable important part in the modern communication and electrical fields.

[0003] In the prior art, shielded wires are mainly used to reduce electromagnetic interference and radio frequency interference to ensure the stability and quality of signal transmission. However, when the shielded wire is exposed to a fire source and catches fire, the insulating layer polymer will undergo thermal decomposition. In this process, the polymer decomposes into small molecule gaseous compounds, and will react with oxygen in the air to generate various gases including carbon dioxide and carbon monoxide, and the incompletely burned solid small particles will also be mixed into the smoke and released together. These smoke particles not only reduce the visibility in the fire field, increase the impact of the smoke on the evacuation and rescue work during a fire, but also the toxic substances carried in the smoke pose a threat to human health. Content of the Utility Model

[0004] The purpose of the utility model is to solve the problem that in the prior art, when the shielded wire is exposed to a fire source and catches fire, the insulating layer polymer will undergo thermal decomposition. In this process, the polymer decomposes into small molecule gaseous compounds, and will react with oxygen in the air to generate various gases including carbon dioxide and carbon monoxide, and the incompletely burned solid small particles will also be mixed into the smoke and released together. These smoke particles not only reduce the visibility in the fire field, increase the impact of the smoke on the evacuation and rescue work during a fire, but also the toxic substances carried in the smoke pose a threat to human health, and a twisted low-smoke halogen-free shielded wire is proposed.

[0005] To achieve the above purpose, the utility model adopts the following technical scheme: A twisted low-smoke halogen-free shielded wire includes an outer sheath layer, a flame retardant layer is arranged on the inner surface wall of the outer sheath layer, and a functional layer is arranged on the inner surface wall of the flame retardant layer.

[0006] Preferably, a fire-resistant layer is arranged on the inner surface wall of the functional layer.

[0007] Preferably, an inner sheath layer is arranged on the inner surface wall of the fire-resistant layer.

[0008] Preferably, a waterproof layer is provided on the inner surface wall of the inner sheath layer.

[0009] Preferably, an oxygen isolation layer is provided on the inner surface wall of the waterproof layer.

[0010] Preferably, an insulating layer is provided on the inner surface wall of the oxygen isolation layer.

[0011] Preferably, a shielding layer is provided on the inner surface wall of the insulating layer.

[0012] Compared with the prior art, the advantages and positive effects of the present utility model are as follows.

[0013] 1. In the present utility model, the flame retardant layer is mainly made of polyethylene material. Although polyethylene itself is not a traditional flame retardant material, by adding specific flame retardants, its flame retardant performance can be improved. These flame retardants can absorb a large amount of heat during the combustion process, reduce the combustion temperature, and at the same time, the generated water vapor and metal oxides can further inhibit the spread of the flame. The functional layer is mainly made of low-smoke and halogen-free polyolefin material. The low-smoke and halogen-free polyolefin generates less smoke when burning, which will quickly reduce the visibility, thereby reducing the impact of the smoke on the evacuation and rescue work of personnel during a fire. And the low-smoke and halogen-free polyolefin releases less toxic gas when burning, which helps to reduce the harm of the fire to the health of personnel.

[0014] 2. In the present utility model, the insulating layer is mainly made of chloroprene rubber material. A large number of chlorine atoms are contained in the chloroprene rubber molecules. These chlorine atoms can form polar bonds in the rubber material. The existence of the polar bonds makes the chloroprene rubber have good insulating performance, which can effectively prevent the leakage and short circuit of current inside the cable, thus ensuring the electrical safety of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a plan view of a twisted pair low-smoke and halogen-free shielded wire proposed by the present utility model;

[0016] Figure 2 is a schematic diagram of a twisted pair low-smoke and halogen-free shielded wire proposed by the present utility model;

[0017] Figure 3 is an unfolded side view of a twisted pair low-smoke and halogen-free shielded wire proposed by the present utility model;

[0018] Figure 4 is a cross-sectional view of a twisted pair low-smoke and halogen-free shielded wire proposed by the present utility model.

[0019] Legend: 1. Outer sheath layer; 2. Flame retardant layer; 3. Functional layer; 4. Fire-resistant layer; 5. Inner sheath layer; 6. Waterproof layer; 7. Oxygen isolation layer; 8. Insulating layer; 9. Shielding layer. Detailed implementation manners

[0020] In order to more clearly understand the above-mentioned objects, features and advantages of the present utility model, the following further describes the present utility model in conjunction with the accompanying drawings and embodiments. It should be noted that, without conflict, the embodiments of the present application and the features in the embodiments can be combined with each other.

[0021] In the following description, many specific details are set forth in order to fully understand the present utility model. However, the present utility model can also be implemented in other ways different from those described herein. Therefore, the present utility model is not limited by the specific embodiments disclosed in the following specification.

[0022] Embodiment 1, as Figures 1-4 shown, the present utility model provides a twisted pair low-smoke halogen-free shielded wire, which includes an outer sheath layer 1. A flame retardant layer 2 is provided on the inner surface wall of the outer sheath layer 1. A functional layer 3 is provided on the inner surface wall of the flame retardant layer 2. A fire-resistant layer 4 is provided on the inner surface wall of the functional layer 3. An inner sheath layer 5 is provided on the inner surface wall of the fire-resistant layer 4. A waterproof layer 6 is provided on the inner surface wall of the inner sheath layer 5.

[0023] The effect achieved by the entire Example 1 is that the outer sheath layer 1 of the twisted low-smoke zero-halogen shielded cable is mainly made of polyethylene material. Polyethylene has good mechanical strength, toughness, and wear resistance, enabling it to withstand various mechanical stresses that the cable may encounter during laying and use, such as tension, bending, and extrusion, thus ensuring the long-term use of the cable. The flame-retardant layer 2 is mainly made of polyethylene material. Although polyethylene itself is not a traditional flame-retardant material, by adding specific flame retardants, its flame-retardant performance can be improved. These flame retardants can absorb a large amount of heat during combustion, reduce the combustion temperature, and at the same time, the generated water vapor and metal oxides can further inhibit the spread of the flame. The functional layer 3 is mainly made of low-smoke zero-halogen polyolefin material. The low-smoke zero-halogen polyolefin produces less smoke when burning, which can quickly reduce visibility, thus reducing the impact of smoke on personnel evacuation and rescue work during a fire. And the low-smoke zero-halogen polyolefin releases less toxic gas when burning, helping to reduce the harm of fire to human health. The fire-resistant layer 4 is mainly made of magnesium oxide material. The thermal expansion coefficient of magnesium oxide is moderate, which helps to reduce the thermal stress caused by temperature changes and improve the heat resistance of the fire-resistant material. So under high-temperature conditions, magnesium oxide as a fire-resistant material can maintain good dimensional stability and is not easily damaged due to thermal stress. The inner sheath layer 5 is mainly made of polypropylene ropes. Polypropylene ropes have the characteristics of not absorbing water, being corrosion-resistant, and not mildewing, which enables them to maintain stable performance in humid and corrosive environments and are suitable for filling the internal voids of the cable. By tightly filling the internal voids of the cable with polypropylene ropes, the cable can maintain roundness and structural stability, helping to reduce deformation and damage of the cable during transportation and use.

[0024] Example 2, as Figures 1-4 shown, an oxygen isolation layer 7 is provided on the inner wall of the waterproof layer 6, an insulating layer 8 is provided on the inner wall of the oxygen isolation layer 7, and a shielding layer 9 is provided on the inner wall of the insulating layer 8.

[0025] The effect achieved by the entire Embodiment 2 is that the insulating layer 8 is mainly made of neoprene material. A large number of chlorine atoms are contained in the neoprene molecules. These chlorine atoms can form polar bonds in the rubber material. The presence of polar bonds makes neoprene have good insulating properties, which can effectively prevent current leakage and short - circuit inside the cable, thus ensuring the electrical safety of the cable. And the shielding layer 9 is made of metal foil material. The metal foil has good electrical conductivity, which enables the metal foil to effectively shield the basis of electromagnetic waves. Since the metal material has a strong absorption and reflection ability for electromagnetic waves, electromagnetic waves can be isolated from the internal transmission line, thereby reducing signal interference and leakage. The waterproof layer 6 is mainly made of cross - linked polyethylene material. Cross - linked polyethylene has excellent waterproof performance and can effectively block the intrusion of moisture, thereby protecting the insulating material and conductor inside the cable from damage. The oxygen - barrier layer 7 is made of magnesium hydroxide. Magnesium hydroxide has multiple functions such as flame retardancy, smoke suppression, and filling. At high temperatures, magnesium hydroxide will decompose into magnesium oxide and water, playing an oxygen - barrier role.

[0026] Working principle: The outer sheath layer 1 of the twisted low - smoke zero - halogen shielded cable is made of polyethylene material. Polyethylene has good mechanical strength, toughness, and wear resistance, so it can withstand various mechanical stresses that the cable may encounter during laying and use, ensuring the long - term use of the cable. The flame - retardant layer 2 is mainly made of polyethylene material. Although polyethylene itself is not a traditional flame - retardant material, by adding specific flame - retardants, its flame - retardant performance can be improved. These flame - retardants can absorb heat during combustion, reduce the combustion temperature, and at the same time, the generated water vapor and metal oxides can further inhibit the spread of the flame. The functional layer 3 is mainly made of low - smoke zero - halogen polyolefin material. The low - smoke zero - halogen polyolefin generates less smoke when burning. It will quickly reduce visibility, thus reducing the impact of smoke on personnel evacuation and rescue work during a fire. And the low - smoke zero - halogen polyolefin releases less toxic gas when burning, which helps to reduce the harm of fire to human health. The fire - resistant layer 4 is mainly made of magnesium oxide material. The thermal expansion coefficient of magnesium oxide is moderate, which helps to reduce the thermal stress caused by temperature changes. So under high - temperature conditions, magnesium oxide as a fire - resistant material can maintain good dimensional stability and is not easily damaged due to thermal stress. The inner sheath layer 5 is mainly made of polypropylene rope. The polypropylene rope has the characteristics of non - water absorption, corrosion resistance, and non - mildew, which enables it to maintain stable performance in humid and corrosive environments. It is suitable for filling the internal voids of the cable, keeping the cable's structural stability, and helping to reduce the deformation and damage of the cable during transportation and use.

[0027] The above are only the preferred embodiments of the present utility model, and are not intended to limit the present utility model in other forms. Any person skilled in the relevant art may use the technical content disclosed above to make changes or modifications into equivalent embodiments with equivalent changes and apply them to other fields. However, as long as it does not depart from the technical solution content of the present utility model, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present utility model still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A twisted pair low smoke zero halogen shielded cable, comprising an outer sheath layer (1), characterized in that: The inner surface wall of the outer sheath layer (1) is provided with a flame retardant layer (2), and the inner surface wall of the flame retardant layer (2) is provided with a functional layer (3).

2. The twisted pair low smoke zero halogen shielded cable according to claim 1, characterized in that: The inner surface wall of the functional layer (3) is provided with a fire-resistant layer (4).

3. The twisted pair low smoke zero halogen shielded cable according to claim 2, characterized in that: The inner surface wall of the fire-resistant layer (4) is provided with an inner sheath layer (5).

4. The twisted pair low smoke zero halogen shielded cable according to claim 3, characterized in that: The inner surface wall of the inner sheath layer (5) is provided with a waterproof layer (6).

5. The twisted pair low smoke zero halogen shielded cable according to claim 4, characterized in that: The inner surface wall of the waterproof layer (6) is provided with an oxygen-isolating layer (7).

6. The twisted pair low smoke zero halogen shielded cable according to claim 5, characterized in that: The inner surface wall of the oxygen isolation layer (7) is provided with an insulating layer (8).

7. The twisted pair low smoke zero halogen shielded cable according to claim 6, characterized in that: The inner surface wall of the insulating layer (8) is provided with a shielding layer (9).

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