Safe environment-friendly flame-retardant thermochromic warning cable

Abstract

The utility model belongs to the technical field of cables, and discloses a safe environment-friendly flame-retardant thermochromic warning cable, which comprises a cable body, the cable body comprises a conductor formed by twisting a plurality of monofilaments, an insulating layer is arranged outside the conductor, the insulating layer is twisted into a cable, a filling layer is arranged in a gap of the insulating layer, and a fire insulation layer is arranged outside the insulating layer. A fire insulation layer is arranged outside the conductor, an oxygen insulation layer is arranged outside the fire insulation layer, an outer protective layer is arranged outside the oxygen insulation layer, a thermochromic coating is arranged outside the outer protective layer, the conductor is a plurality of annealed copper monofilament stranded conductors, the insulating layer is formed by extruding a cross-linked polyethylene insulating material, the filling layer is a high-temperature flame-retardant filling rope, and the fire insulation layer is formed by overlapping and lapping two layers of low-smoke halogen-free belts. According to the utility model, the fire insulation layer and the outer sheath layer are arranged to improve the fire blocking and heat insulation functions of the cable body, and when the temperature sensing early warning coating is arranged and the temperature reaches a limit value, the outer sheath layer changes in color to give an alarm, so that timely finding and troubleshooting are facilitated, and the operation safety of the cable is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to a safe, environment-friendly, flame-retardant, temperature-sensitive color-changing warning cable. Background Art

[0002] At present, the cables commonly used in domestic fire-fighting places are mostly halogen-free low-smoke flame-retardant cables. Such cables have a certain ability to prevent the spread of flames in a fire, and the amount of smoke released during their combustion meets the requirement of 60% light transmittance. However, such cables also have deficiencies and do not fully consider the impact of the cables on surrounding combustibles in a fire. In addition to assessing the height of flame spread and the flaming combustion time of the specimen after stopping the fire supply, the flame-retardant B1-level cable also assesses a series of items such as the heat release, smoke generation characteristics, single-fiber combustion, smoke density, combustion drip / particle level, smoke toxicity level, and corrosivity of the cable. Therefore, the flame-retardant B1-level cable has higher requirements for the combustion characteristics of the cable.

[0003] When the cable operates in a heated state, it will bring great hidden dangers to the cable. The higher the temperature, the greater the overcurrent and the greater the damage to the cable. Long-term heated operation of the cable will cause thermal corrosion to the insulation and sheath, accelerate their aging, reduce the service life of the cable, and form potential safety hazards. At present, the common method for maintaining and inspecting electrical safety is to conduct regular manual inspections, but it can only rely on experience, resulting in missed inspections and false inspections. With the help of instruments such as a thermometer and an infrared imager, only random screening inspections can be carried out, and full inspections and real-time monitoring cannot be achieved. The linear constant-temperature detector system or the distributed optical fiber temperature measurement system can achieve real-time monitoring, but the investment is very large. Therefore, we propose a safe, environment-friendly, flame-retardant, temperature-sensitive color-changing warning cable to solve the above problems. Content of the Utility Model

[0004] The purpose of the utility model is to solve the defects existing in the prior art, and to propose a safe, environment-friendly, flame-retardant, temperature-sensitive color-changing warning cable.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A safe, environment-friendly, flame-retardant, temperature-sensitive color-changing warning cable includes a cable body. The cable body includes a conductor formed by stranding multiple single wires. An insulating layer is provided outside the conductor. The insulating layer is stranded into a cable. A filling layer is provided in the gap of the insulating layer. A fire-separating layer is provided outside the insulating layer. The fire-separating layer is formed by overlapping and winding 2 layers of low-smoke halogen-free tapes. An oxygen-separating layer is provided outside the fire-separating layer. An outer sheath is provided outside the oxygen-separating layer. A temperature-sensitive color-changing coating is provided outside the outer sheath.

[0007] Preferably, the conductor is an annealed copper multi-strand single-wire stranded conductor.

[0008] Preferably, the insulating layer is formed by extrusion of a cross-linked polyethylene insulating material.

[0009] Preferably, the filling layer is a high-temperature flame-retardant filling rope.

[0010] Preferably, the oxygen isolation layer is made of extruded high-oxygen-index halogen-free low-smoke polyolefin.

[0011] Preferably, the outer protective layer is made of extruded halogen-free low-smoke flame-retardant polyolefin with low heat release.

[0012] Preferably, the thermochromic coating is a microcapsule photocured thermosensitive coating.

[0013] Advantages of the present utility model:

[0014] 1. By providing a fire separation layer, which is composed of 2 layers of low-smoke halogen-free tapes overlapping and winding, the low-smoke halogen-free flame-retardant tape plays a role in tightening the cable and has a certain fire-blocking and heat-insulating function. An insulating and oxygen-isolating layer is provided to ensure that the external combustion flame does not spread or is delayed from spreading to the internal insulating layer, so that the internal temperature of the cable during combustion will not be too high, thereby achieving the effect of suppressing the rate and total amount of heat release during cable combustion.

[0015] 2. By providing an outer protective layer, which is made of extruded halogen-free low-smoke flame-retardant polyolefin with low heat release, when the cable is impacted by a flame, the protective layer will quickly expand and sinter to form a hard shell, thereby protecting the internal insulation and combustibles of the cable, so that the internal temperature of the cable during combustion will not be too high, thereby achieving the effect of flame retardancy and heat insulation. Overall, during combustion, the heat release amount is low, there are no combustion drippings, it can block the impact of the flame and falling objects, and effectively prevent the spread of the flame.

[0016] 3. By providing a thermochromic coating, during the daily operation of the cable, it can sense the temperature rise of the conductor and transmit it to the insulation sheath. When the temperature reaches the limit value, the outer sheath layer will change color to give a warning, which is convenient for timely detection and troubleshooting, avoiding the aging of the insulation sheath caused by overheating of the cable, resulting in insulation thermal breakdown, and the occurrence of phase-to-phase short-circuit tripping of the cable. In severe cases, it may burn out the circuit and even cause a fire hazard. Description of the Drawings

[0017] Figure 1 is a three-dimensional structural schematic diagram of a safe, environmentally friendly, flame-retardant and thermochromic warning cable proposed by the present utility model;

[0018] Figure 2 is a sectional three-dimensional structural schematic diagram of a safe, environmentally friendly, flame-retardant and thermochromic warning cable proposed by the present utility model.

[0019] In the figure: 1. Conductor; 2. Insulating layer; 3. Filling layer; 4. Fire separation layer; 5. Oxygen isolation layer; 6. Outer protective layer; 7. Thermochromic coating; 8. Cable body. Detailed implementation manners

[0020] The technical solutions of the present utility model will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts belong to the scope of protection of the present utility model.

[0021] Referring to Figure 1-2 , a safe, environmentally friendly, flame-retardant, temperature-sensitive color-changing warning cable, comprising a cable body 8. The cable body 8 includes a conductor 1 formed by stranding multiple single wires. An insulating layer 2 is provided outside the conductor 1. The insulating layer 2 is stranded into a cable. A filling layer 3 is provided in the gap of the insulating layer 2. A fire separation layer 4 is provided outside the insulating layer 2. An oxygen isolation layer 5 is provided outside the fire separation layer 4. An outer protective layer 6 is provided outside the oxygen isolation layer 5. A temperature-sensitive color-changing coating 7 is provided outside the outer protective layer 6. The cable body 8 can meet the requirements of combustion performance B1 level, smoke toxicity t1 level, and combustion drip / particle level d1 level, avoiding causing secondary fires.

[0022] In this embodiment, the conductor 1 is an annealed copper multi-strand single-wire stranded conductor, with a smooth surface and no oil stain, having excellent electrical conductivity and mechanical properties.

[0023] In this embodiment, the insulating layer 2 is formed by extrusion of cross-linked polyethylene insulating material. The temperature resistance grade of the cross-linked polyethylene insulating material can reach 90 °C and it does not contain halogens, and no toxic substances are released during combustion.

[0024] In this embodiment, the filling layer 3 is a high-temperature flame-retardant filling rope, having good flame-retardant and heat-absorbing properties. Under the condition of high-temperature combustion, the filling does not melt or drip, making the entire cable core round and full, and blocking the entry of air as much as possible.

[0025] In this embodiment, the fire separation layer 4 is formed by overlapping and winding 2 layers of low-smoke and halogen-free tapes. The overlapping rate of the halogen-free tapes is not less than 25%. The halogen-free tapes are attached with inorganic flame retardants such as magnesium hydroxide and aluminum hydroxide, which will decompose to produce water molecules when encountering high temperature, playing a role in flame retardancy and fire extinguishing.

[0026] In this embodiment, the oxygen isolation layer 5 is formed by extrusion of a high oxygen index halogen-free low-smoke polyolefin, mainly used for delaying the combustion and spread of flames.

[0027] In this embodiment, the outer protective layer 6 is formed by extrusion of a halogen-free low-smoke flame-retardant polyolefin with low heat release, having the effects of low heat release, halogen-free, low smoke, and flame retardancy.

[0028] In this embodiment, the temperature-sensitive color-changing coating 7 is a microcapsule photocuring temperature-sensitive coating. Enzymes are fixed in the microcapsules of the semi-permeable polymer membrane. Generally, the diameter of the microcapsules is only a few to several hundred micrometers. There are many types of colors that change with temperature, and the temperature range of color change can also be adjusted. Therefore, products with various temperatures and various colors can be manufactured.

[0029] During the daily operation of the cable, it can sense the temperature rise of the conductor and transmit it to the insulation sheath. When the temperature reaches the limit value, the outer sheath layer will change color to give a warning, which is convenient for timely detection and troubleshooting, and improves the safety of cable operation.

[0030] In the present utility model, by providing a fire separation layer 4, and the fire separation layer 4 is formed by overlapping and winding 2 layers of low-smoke and halogen-free tapes. The low-smoke and halogen-free flame-retardant tape plays a role in tightening the cable and has a certain fire-blocking and heat-insulating function. By providing a heat-insulating and oxygen-isolating layer 5, it can ensure that the external combustion flame does not spread or is delayed from spreading to the internal insulation layer, so that the internal temperature of the cable will not be too high when burning, thereby achieving the effect of suppressing the rate and total amount of heat release during cable combustion. By providing an outer sheath layer 6, the outer sheath layer 6 is made of extruded low-smoke, halogen-free, and flame-retardant polyolefin with low heat release. When the cable is impacted by a flame, the sheath will quickly expand and sinter to form a hard shell to protect the internal insulation and combustibles of the cable, so that the internal temperature of the cable will not be too high when burning, thereby achieving the effect of flame retardancy and heat insulation. Overall, in the case of combustion, the heat release is low, there are no combustion drippings, it can block the impact of the flame and falling objects, effectively prevent the spread of the flame. By providing a temperature-sensitive warning coating, during the daily operation of the cable, it can sense the temperature rise of the conductor 1 and transmit it to the insulation sheath. When the temperature reaches the limit value, the outer sheath layer will change color to give a warning, which is convenient for timely detection and troubleshooting, and avoids potential hazards such as insulation sheath aging caused by overheating of the cable, insulation thermal breakdown, and phase-to-phase short-circuit tripping of the cable. In severe cases, it may even burn out the circuit and cause a fire.

[0031] The above has introduced in detail a safe, environmentally friendly, flame-retardant, temperature-sensitive color-changing warning cable provided by the present utility model. Specific embodiments are used herein to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present utility model, several improvements and modifications can still be made to the present utility model, and these improvements and modifications also fall within the protection scope of the claims of the present utility model.

Claims

1. A safe, environmentally friendly, flame-retardant, temperature-sensitive, color-changing warning cable, characterized in that: The cable body (8) comprises a conductor (1) formed by twisting a plurality of monofilaments, an insulating layer (2) is provided outside the conductor (1), the insulating layer (2) is twisted into a cable, a filling layer (3) is provided in the gap of the insulating layer (2), a fire-proof layer (4) is provided outside the insulating layer (2), an oxygen-proof layer (5) is provided outside the fire-proof layer (4), the fire-proof layer (4) is composed of two layers of overlapping low-smoke halogen-free tapes, an outer protective layer (6) is provided outside the oxygen-proof layer (5), and a thermochromic coating (7) is provided outside the outer protective layer (6).

2. The safe, environmentally friendly, flame-retardant, temperature-sensitive, color-changing warning cable according to claim 1, characterized in that: The conductor (1) is a conductor made of multiple annealed copper single filaments twisted together.

3. The safe, environmentally friendly, flame-retardant, temperature-sensitive, color-changing warning cable according to claim 1, characterized in that: The insulating layer (2) is formed by extrusion of cross-linked polyethylene insulating material.

4. The safe, environmentally friendly, flame-retardant, temperature-sensitive, color-changing warning cable according to claim 1, characterized in that: The filling layer (3) is a high-temperature flame-retardant filling rope.

5. The safe, environmentally friendly, flame-retardant, temperature-sensitive, color-changing warning cable according to claim 1, characterized in that: The oxygen barrier layer (5) is made of extruded high oxygen index halogen-free and low smoke polyolefin.

6. The safe, environmentally friendly, flame-retardant, temperature-sensitive, color-changing warning cable according to claim 1, characterized in that: The outer protective layer (6) is made of extruded, low-heat-release, halogen-free, low-smoke, flame-retardant polyolefin.

7. The safe, environmentally friendly, flame-retardant, temperature-sensitive, color-changing warning cable according to claim 1, characterized in that: The thermochromic coating (7) is a microcapsule light-cured thermochromic coating.

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