Flexible low-voltage flame-retardant cable

Abstract

The utility model discloses a flexible low-voltage flame-retardant cable, which comprises a plurality of wire cores and a sheath used for wrapping the wire cores, and the structure of each wire core is sequentially provided with a conductor, a bulletproof wire and an insulating layer from inside to outside; fillers are arranged in gaps among the wire cores, the sheath is sequentially provided with a flame-retardant tape, an oxygen barrier layer, an armor layer, a water-blocking tape and an outer protective layer from inside to outside, and the conductors are sixth soft copper wires. The cable is reasonable in structural design, and has the following beneficial effects that the sixth soft copper wires are adopted, and a plurality of strands of fine copper wires are stranded in the same direction, so that the flexibility of the cable is greatly improved, the cable has better flexibility and bending resistance, the phenomenon of core breakage does not occur even if the cable is frequently bent for a long time, and the service life of the cable is prolonged. Meanwhile, the outer surfaces of the conductors in the wire cores are provided with the bulletproof wires which are twisted together, so that the toughness of the cable is further enhanced, and the tensile failure resistance is remarkably improved; and the water-blocking tape is arranged to prevent water and moisture from spreading longitudinally, so that a water-blocking effect is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of cables, in particular to a flexible low-voltage flame-retardant cable. Background Art

[0002] With the development of social economy, the demand for power application and data application is constantly increasing. For example, various fields such as residential buildings, rail transit, industrial and mining enterprises require the use of a large number of complex lines for power energy and signal transmission.

[0003] At present, the internal settings of existing commonly used cables are usually hard wires, that is, the power line or signal line made of metal (mainly copper material) and the protective outer layer constitute the corresponding power cable and signal cable. This type of cable has high hardness and is not easy to bend in an environment where bending is required. For specific sections, it is also necessary to prevent it from bending, so it is not suitable for working environments with more bending. And due to the diversity and complexity of the use occasions, higher requirements are put forward for the power cords used for this type of equipment. For example, when laying open wires in buildings, such as basements, warehouses, tunnels, etc., it must have the performance of anti-rat and anti-ant damage; due to the narrow and changeable wiring location, it is required to have good flexibility, bend resistance, and drag resistance; because it is distributed in public places or indoors, it must have excellent flame retardant properties and non-toxic odor volatilization; and the power cord currently used by the equipment, in order to improve the resistance to smashing, adds steel belt armor, is not easy to bend, this type of cable cannot meet the above requirements, which seriously affects the use of users. Utility Model Content

[0004] The utility model aims to provide a flexible low-voltage flame-retardant cable, which is not only suitable for working environments with many bends, but also has the characteristics of good flexibility, bending resistance and drag resistance, and at the same time has excellent flame-retardant performance and is environmentally friendly.

[0005] In order to achieve the above-mentioned purpose, the technical solution of the utility model provides a flexible low-voltage flame-retardant cable, comprising a plurality of cores and a sheath for wrapping the cores, the structure of the cores being provided with a conductor, a bulletproof wire, and an insulating layer in sequence from the inside to the outside; a filler is provided in the gap between the cores, and the sheath is provided with a flame-retardant tape, an oxygen insulation layer, an armor layer, a water-blocking tape, and an outer protective layer in sequence from the inside to the outside, and the conductor is the sixth type of soft copper wire.

[0006] The conductor is the sixth type of soft copper wire, with multiple strands of fine copper wires twisted in the same direction, which greatly improves the softness of the cable and makes the cable have good flexibility and bending resistance. Even if it is subjected to frequent and long-term bending, the core will not break. At the same time, the bulletproof wire is twisted together to further enhance the toughness of the cable, and the resistance to tensile breakage is significantly increased.

[0007] The use of bulletproof wire can enhance the toughness of the cable and significantly increase its resistance to tensile breakage.

[0008] The water-blocking tape is used, which has the characteristics of high expansion pressure, fast expansion speed, good gel stability and good thermal stability, so as to prevent the longitudinal spread of water and moisture, thereby playing a water-blocking role.

[0009] Furthermore, the conductor is a bundle-twisted structure; and bulletproof wires are arranged on the outer surface of the conductor and are bundle-twisted together.

[0010] Furthermore, the conductor is formed by twisting 7 strands of the sixth type of soft copper wires, and 6 strands of bulletproof wires are twisted together on the outer surface of the conductor.

[0011] Furthermore, the number of the wire cores is 4, and the cross-section formed by the wire cores and the filler is circular.

[0012] Furthermore, the insulating layer is a polypropylene (PP) insulating layer.

[0013] The insulation layer is made of polypropylene PP insulation material, which makes the cable resistant to high temperatures up to 140°C and low temperatures up to -30°C. It has the characteristics of low density, light weight, high volume resistivity, thin wall, smaller cable bending radius, strong resistance to bending fatigue, halogen-free, and more environmentally friendly.

[0014] Furthermore, the filler is rock wool rope.

[0015] The filling material is rock wool rope, which is resistant to high temperature and has excellent flame retardant properties.

[0016] Furthermore, the flame retardant tape is an overlappingly wrapped low-smoke halogen-free high flame retardant tape.

[0017] The flame retardant tape is a low-smoke, halogen-free, highly flame retardant tape that is overlapped and wrapped. During the combustion process, it can absorb a large amount of heat energy and form a carbon shell layer to isolate the air and prevent further combustion of the cable, effectively playing the role of fire and oxygen isolation.

[0018] Furthermore, the oxygen-isolating layer is a ceramicized polyolefin fireproof sheath.

[0019] The oxygen barrier layer is made of ceramic polyolefin fireproof jacket material, which has excellent flame retardant performance, is halogen-free, more environmentally friendly, and can effectively protect the shielding layer from damage. Under flame burning or high temperature conditions, a hard ceramic-like hard shell can be generated. The hard shell does not melt or drip, is resistant to water spray and mechanical vibration, and has very good heat insulation and fireproof effects, which can ensure the smooth flow of power and information control in the event of a fire, and buy precious time for personnel escape and fire rescue.

[0020] Furthermore, the armor layer is aluminum wire armor.

[0021] The armor layer is aluminum wire armor, and the tightly wound aluminum wire is used as the armor layer protection, which can effectively protect the integrity of the cable structure and electrical performance, and improve the service life of the cable. The aluminum wire armor is used to protect the cable from damage and damage by external mechanical forces, and can also prevent rats and termites from biting, so as not to cause power transmission problems through the armor, and ensure the excellent bending performance and drag resistance of the wire. At the same time, the aluminum wire winding layer also has a shielding effect, which can shield the electromagnetic interference generated, and has the advantages of light weight.

[0022] Furthermore, the outer protective layer is a polyurethane PUR sheath.

[0023] The outer protective layer is made of polyurethane PUR sheath material, which is resistant to oil, acid and alkali, hydrolysis, UV, low temperature and wear.

[0024] In summary, the device structure of the utility model is reasonably designed, and the use of the technical solution of the utility model has the following beneficial effects: the structure of the wire core is sequentially provided with a conductor, a bulletproof wire, and an insulating layer from the inside to the outside; the conductor is the sixth type of soft copper wire. The utility model adopts the sixth type of soft copper wire, and uses multiple strands of fine copper wires to be bundled in the same direction, which greatly improves the softness of the cable, has good flexibility and bending resistance, and will not break the core even if it is subjected to frequent long-term bending. At the same time, the outer surface of the conductor in the wire core is bundled with bulletproof wire, which further enhances the toughness of the cable and significantly increases the resistance to tensile breakage; a water-blocking belt is provided to prevent water and moisture from spreading longitudinally, thereby playing a water-blocking role. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the cross-sectional structure of the utility model flexible low-voltage flame-retardant cable;

[0026] Explanation of the reference numerals: 1- conductor; 2- bulletproof wire; 3- insulation layer; 4- flame retardant tape; 5- oxygen insulation layer; 6- armor layer; 7- water-blocking tape; 8- outer protective layer. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention, but this does not constitute a limitation on the protection scope of the present invention.

[0028] In the present invention, for a clearer description, the following explanation is made: the observer faces the attached Figure 1For observation, the left front side of the observer is set as the front, the right rear side of the observer is set as the rear, the left rear side of the observer is set as the left, the right front side of the observer is set as the right, the top of the observer is set as the top, and the bottom of the observer is set as the bottom. It should be pointed out that the terms "front end", "rear end", "left side", "right side", "middle", "top", "bottom" and the like in the text indicate the orientation or position relationship based on the orientation or position relationship set in the drawings, which is only for the convenience of clearly describing the utility model, and does not indicate or imply that the structure or component referred to must have a specific orientation or be constructed in a specific orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third", and "fourth" are only used for the purpose of clarifying or simplifying the description, and cannot be understood as indicating or implying relative importance or quantity.

[0029] See also Figure 1 The utility model provides a flexible low-voltage flame-retardant cable, comprising a plurality of cores and a sheath for wrapping the cores. The structure of the core is provided with a conductor 1, a bulletproof wire 2, and an insulating layer 3 in sequence from the inside to the outside; a filler is provided in the gap between the cores, and the sheath is provided with a flame-retardant tape 4, an oxygen-isolating layer 5, an armor layer 6, a water-blocking tape 7, and an outer protective layer 8 in sequence from the inside to the outside. The conductor 1 is the sixth type of soft copper wire.

[0030] The conductor 1 of the prior art uses hard copper conductor, and the cable is not easy to bend and is easy to break. However, the utility model uses the sixth type of soft copper wire, and uses multiple strands of fine copper wires to be bundled and twisted in the same direction, which greatly improves the softness of the cable, has good flexibility and bending resistance, and will not break even if it is subjected to frequent long-term bending. At the same time, the bulletproof wire 2 is added to the bundle, which further enhances the toughness of the cable and significantly increases the anti-breaking ability.

[0031] The utility model adopts the mechanical wrapping of the water-blocking tape 7, which has the characteristics of high expansion pressure, fast expansion speed, good gel stability and good thermal stability, and prevents water and moisture from spreading longitudinally, thereby playing a waterproof and moisture-proof role.

[0032] As a preferred embodiment of the present invention, the conductor 1 is a bundle-twisted structure; the outer surface of the conductor 1 is provided with bulletproof wires 2 twisted together; the conductor 1 is formed by twisting 7 strands of the sixth type of soft copper wires, and the outer surface of the conductor 1 is provided with 6 strands of bulletproof wires 2 twisted together.

[0033] Specifically, the number of wire cores is 4, and the cross-section formed by the wire cores and the filler is circular.

[0034] As a preferred embodiment of the utility model, the insulating layer 3 is a polypropylene PP insulating layer. The existing insulation material uses polyvinyl chloride (PVC) or cross-linked polyethylene (XLPE), and the temperature resistance level of the cable only reaches 70°C or 90°C. The utility model uses high-quality polypropylene PP material, which has the following advantages.

[0035] 1. PP material is a white waxy material, transparent and light in appearance, with a density of 0.89-0.91g / cm3, while the density of the PVC material we are familiar with is 1.40-1.45g / cm3. Therefore, cables with PP insulation are much lighter than those with PVC insulation of the same size.

[0036] 2. The melting point of PP material is 164-170℃, softening at about 155℃, and the operating temperature range of the cable is -30-140℃. In a normal working environment, the temperature of the drag chain cable made of this material meets the requirements of the use conditions.

[0037] 3. PP material has good chemical resistance and can resist corrosion from acids, alkalis, salt solutions and various organic solvents below 80°C. The corresponding cables also have this property and can be used in some harsh environments.

[0038] 4. PP material has a large volume resistivity, so it can be made into thin walls, so that the outer diameter of the overall product is small, and the bending radius of the same specification in the drag chain shell is smaller.

[0039] 5. The most outstanding performance of PP material is its resistance to bending fatigue. Among insulating materials, it has better bending toughness than PVC material, so its bending fatigue life is longer.

[0040] Specifically, the filler is rock wool rope; the flame retardant tape 4 is an overlapping and wrapped low-smoke halogen-free high flame retardant tape; and the oxygen insulation layer 5 is a ceramic polyolefin fireproof sheath.

[0041] The utility model cable is provided with an oxygen-insulating layer 5, which is made of ceramicized polyolefin fireproof sheath material, has excellent flame retardant performance, is halogen-free, more environmentally friendly, and effectively protects the shielding layer from damage. A hard ceramic-like hard shell can be generated under flame burning or high temperature conditions, which does not melt or drip, is resistant to water spray and mechanical vibration, and has very good heat insulation and fireproof effects, which can ensure the smooth flow of power and information control in the event of a fire, and buy precious time for personnel escape and fire rescue.

[0042] Specifically, the armor layer 6 is aluminum wire armor.

[0043] The armor layer 6 of the prior art is mostly steel belt armor, which has a large bending radius and is not easy to bend. However, the utility model cable is aluminum wire armored, and adopts tightly wound aluminum wire as armor layer 6 protection, which can effectively protect the integrity of the cable structure and electrical performance, and improve the service life of the cable. It further protects the cable from damage and damage by external mechanical forces, and can also prevent rats and termites from biting, so as not to cause power transmission problems through the armor, and ensures the excellent bending performance and drag resistance of the wire. At the same time, the aluminum wire winding layer also has a shielding effect, shielding the electromagnetic interference generated by the power source itself and the outside, and has the advantages of light weight.

[0044] Specifically, the outer protective layer 8 is a polyurethane PUR sheath.

[0045] The outer sheath of the prior art is mostly extruded from polyvinyl chloride (PVC), while the outer protective layer 8 of the sheath material of the utility model is made of polyurethane PUR sheath material, which has the characteristics of oil resistance, acid and alkali resistance, hydrolysis resistance, UV resistance, low temperature resistance, wear resistance, etc. It effectively solves the environmental protection requirements of cable flexibility, rat bite resistance, drag resistance, high and low temperature resistance, waterproof and moisture resistance, and low smoke and halogen-free flame retardancy in multiple environments and places.

[0046] Compared with the prior art, the utility model has the following beneficial effects:

[0047] 1. The conductor 1 is made of the sixth type of soft copper wire, and multiple strands of fine copper wires are twisted in the same direction, which greatly improves the softness of the cable and has good flexibility and bending resistance. Even if it is subjected to frequent and long-term bending, the core will not break. At the same time, the bulletproof wire 2 is twisted together to further enhance the toughness of the cable and significantly increase the resistance to tensile breakage;

[0048] 2. The insulation layer 3 is made of high-quality polypropylene (PP) material, which makes the cable resistant to high temperatures up to 140°C and low temperatures up to -30°C. It has low density, light weight, and high volume resistivity. It can be made into thin walls, making the cable bending radius smaller. The most outstanding performance is its resistance to bending fatigue. Among insulating materials, it has better bending toughness than PVC materials, so it has a longer bending fatigue life.

[0049] 3. The oxygen barrier layer 5 is made of ceramic polyolefin fireproof jacket material, which has excellent flame retardant performance, is halogen-free, more environmentally friendly, and effectively protects the shielding layer from damage. It can also generate a hard ceramic shell under flame burning or high temperature conditions. The hard shell does not melt or drip, is resistant to water spray and mechanical vibration, and has very good heat insulation and fireproof effects, which can ensure the smooth flow of power and information control in the event of a fire, and buy precious time for personnel escape and fire rescue.

[0050] 4. Adopting tightly wound aluminum wire as armor layer 6 to protect the cable can effectively protect the integrity of the cable structure and electrical performance, and improve the service life of the cable. It can further protect the cable from damage and damage by external mechanical forces, and can also prevent rats and termites from biting, so as not to cause power transmission problems through the armor, and ensure the excellent bending performance and drag resistance of the wire. At the same time, the aluminum wire winding layer also has a shielding effect, shielding the electromagnetic interference generated by the power supply itself and the outside, and has the advantages of light weight.

[0051] 5. The outer protective layer 8 is made of polyurethane PUR sheath material, which is resistant to oil, acid and alkali, hydrolysis, UV, low temperature and wear. It effectively solves the cable's flexibility, rat bite resistance, drag resistance, high and low temperature resistance, waterproof and moisture-proof, and current low-smoke halogen-free flame retardant environmental protection requirements under multiple environments and multiple places. The flexible cable has very good bending performance, and the minimum bending radius can reach 5 times the cable outer diameter.

[0052] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the protection scope of the present invention.

Claims

1. A flexible low-voltage flame-retardant cable, comprising a plurality of cores and a sheath for wrapping the cores, characterized in that: The structure of the wire core is provided with a conductor, a bulletproof wire, and an insulating layer in sequence from the inside to the outside; fillers are provided in the gaps between the wire cores, and the sheath is provided with a flame retardant tape, an oxygen insulation layer, an armor layer, a water-blocking tape, and an outer protective layer in sequence from the inside to the outside, and the conductor is the sixth type of soft copper wire.

2. A flexible low-voltage flame-retardant cable according to claim 1, characterized in that: The conductor is a bundle-twisted structure; the outer surface of the conductor is provided with bulletproof wires to be bundled together.

3. A flexible low-voltage flame-retardant cable according to claim 1 or 2, characterized in that: The conductor is formed by twisting 7 strands of the sixth type of soft copper wires, and 6 strands of bulletproof wires are arranged on the outer surface of the conductor and twisted together.

4. A flexible low-voltage flame-retardant cable according to claim 3, characterized in that: The number of the wire cores is 4, and the cross section formed by the wire cores and the filler is circular.

5. A flexible low-voltage flame-retardant cable according to claim 1 or 4, characterized in that: The insulating layer is a polypropylene PP insulating layer.

6. A flexible low-voltage flame-retardant cable according to claim 1 or 4, characterized in that: The filler is rock wool rope.

7. A flexible low-voltage flame-retardant cable according to claim 1 or 4, characterized in that: The flame retardant tape is an overlapping and wrapped low-smoke, halogen-free and highly flame retardant tape.

8. A flexible low-voltage flame-retardant cable according to claim 1 or 4, characterized in that: The oxygen-isolating layer is a ceramicized polyolefin fireproof sheath.

9. A flexible low-voltage flame-retardant cable according to claim 1 or 4, characterized in that: The armor layer is aluminum wire armor.

10. A flexible low-voltage flame-retardant cable according to claim 1 or 4, characterized in that: The outer protective layer is a polyurethane PUR sheath.

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