Flame-retardant impact-resistant composite low-voltage power cable

Abstract

The utility model discloses a flame-retardant impact-resistant composite low-voltage power cable, which comprises a cable core, a low-smoke halogen-free wrapping layer, an oxygen barrier layer and an outer sheath, wherein the low-smoke halogen-free wrapping layer is wrapped outside the cable core; the oxygen barrier layer and the outer sheath are arranged outside the low-smoke halogen-free wrapping layer from inside to outside; the cable core is formed by twisting a plurality of power line cores and a plurality of signal line cores, and the power line cores and the signal line cores are symmetrically twisted in a triangle shape. A filling rope is filled in a twisting gap of the cable core; the oxygen barrier layer is extruded outside the low-smoke halogen-free wrapping layer, and the oxygen barrier layer is made of high-flame-retardant polystyrene; and the outer sheath is extruded outside the oxygen barrier layer, and the material of the outer sheath is impact-resistant and high-temperature-resistant polystyrene. The cable provided by the utility model has the advantages of excellent flame retardation performance, impact resistance performance, safety performance, space saving, labor cost reduction, good high temperature resistance performance, good flexibility, high tensile strength, stable signal transmission, good insulation performance, environmental protection and good environment resistance performance.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of power cable, concretely is a kind of flame-retardant impact-resistant composite low-voltage power cable. BACKGROUND

[0002] In the construction of power system, long-distance transmission relies on overhead power network, intermediate part transmission and distribution relies on medium-voltage power cable, and power enters household by low-voltage power cable. Low-voltage power cable is suitable for fixed laying on AC 50Hz, rated voltage 3kv and below transmission and distribution line for power transmission, generally buried in soil or laid in indoor, channel, tunnel. Since low-voltage power cable is generally used in densely populated residential and commercial buildings. Specifically, low-voltage power cable is mainly used for indoor wiring in residential buildings, connecting various household appliances and lighting equipment, to ensure the safety of residential power supply. These cables need to have good safety performance, flame retardance and durability to adapt to frequent use and high load demand in densely populated environment. In commercial buildings, low-voltage power cables also play a key role. They are used to connect office facilities, lighting systems and various commercial equipment to ensure the smooth progress of commercial activities. The cable layout of commercial buildings is usually more complex, requiring these cables to have higher transmission efficiency and safety. In addition, densely populated residential and commercial buildings have certain requirements for the environmental adaptability of cables, such as the ability to withstand certain mechanical pressure, to ensure the long-term stable operation of the cables. At the same time, since low-voltage power cable is buried in soil or laid in indoor, channel, tunnel, when it is accidentally hit or vibrated during construction or use, it needs to maintain the integrity of the structure and the stability of the electrical performance, so it also needs low-voltage cable to have excellent impact resistance. In summary, low-voltage power cable needs to have safety performance, flame retardance, durability and impact resistance.

[0003] At the same time, the use of low-voltage power cable is mostly for urban power transmission, and land resources are scarce and expensive. For power and communication lines, two lines are usually laid side by side without interfering with each other: a power transmission channel is built, the cable is installed, and then the channel for communication lines is built, and the optical cable is installed. To overcome the above-mentioned contradiction, a cable with a larger diameter is often used, which increases the production cost of the cable. This not only wastes land resources but also wastes manpower and resources. SUMMARY

[0004] The utility model aims at: in view of the deficiency of prior art, provide a kind of flame-retardant impact-resistant composite low-voltage power cable with good flame-retardant performance, excellent impact resistance, good insulation performance and high safety performance.

[0005] The technical purpose of the utility model is realized by the following technical scheme:

[0006] The utility model provides a kind of fire-retardant impact-resistant composite low-voltage power cable, including cable core, low-smoke halogen-free wrapping layer wrapped outside cable core and oxygen barrier layer and outer sheath arranged outside low-smoke halogen-free wrapping layer from inside to outside;The cable core is stranded by multiple power supply line cores and multiple signal line cores, and the power supply line cores and signal line cores are symmetrically stranded in triangular shape;The stranded gap of the cable core is filled with filling rope;The oxygen barrier layer is extruded and wrapped outside low-smoke halogen-free wrapping layer, and the material of the oxygen barrier layer is high flame-retardant polystyrene;The outer sheath is extruded and wrapped outside the oxygen barrier layer, and the material of the outer sheath is impact-resistant high-temperature-resistant polystyrene.

[0007] Preferably, the oxygen barrier layer contains temperature sensing optical fiber.

[0008] Preferably, the power supply line core includes a first conductor and a first insulating layer disposed outside the first conductor, and a mica tape wrapping layer is provided between the first conductor and the first insulating layer.

[0009] Preferably, the first conductor is stranded by a plurality of tinned copper wires, the mica tape wrapping layer is a structure of overlapping wrapping of mica tapes outside the first conductor, and the first insulating layer is extruded and wrapped outside the mica tape wrapping layer, and the material of the first insulating layer is flame-retardant crosslinked polyethylene.

[0010] Preferably, the signal line core is composed of a second conductor and a second insulating layer, the second conductor is stranded by a plurality of tinned copper wires, and the second insulating layer is extruded and wrapped outside the second conductor, and the material of the second insulating layer is crosslinked polyethylene.

[0011] Preferably, the outer sheath is coated with a fireproof coating on the outside.

[0012] Preferably, the filling rope is a flame-retardant filling rope.

[0013] Preferably, the material of the low-smoke halogen-free wrapping layer is a low-smoke halogen-free flame-retardant tape.

[0014] Compared with the prior art, the utility model has the beneficial effects that:

[0015] 1.The utility model discloses a cable core, the low smoke halogen free wrapping layer of wrapping in the cable core outside and the oxygen barrier layer and the outer sheath of setting outside the low smoke halogen free wrapping layer from inside to outside are set, the cable core is twisted by multiple power line cores and multiple signal line cores, and the power line core and signal line core are twisted into a triangular shape symmetry, and the twisted gap of cable core is filled with filling rope, the oxygen barrier layer is extruded to the low smoke halogen free wrapping layer outside, and the material of oxygen barrier layer is high flame -retardant polystyrene, the outer sheath is extruded to the oxygen barrier layer outside, and the material of outer sheath is impact -resistant high temperature polystyrene.The utility model has excellent flame -retardant performance, impact resistance and safety performance, and has the advantages of saving space, reducing the cost of manual, good high temperature resistance, good flexibility, high tensile strength, stable signal transmission, good insulation, environmental protection and good environmental resistance.

[0016] 2.The utility model discloses an oxygen barrier layer contains temperature -sensitive optical fiber.In the oxygen barrier layer, four temperature -sensitive optical fibers are evenly arranged in the circumferential direction.Through the setting of temperature -sensitive optical fiber, the temperature change of the cable can be monitored in real time, so that the existing safety hazards can be found and handled in time.The technical measures can effectively enhance the safety performance of the cable.

[0017] 3.The outer sheath of the utility model is coated with a fireproof coating.For example, a layer of cable fireproof paint, such as YDAH-102 cable fireproof paint, is coated on the outer sheath.YDAH-102 cable fireproof paint is a new type of fireproof paint that can generate a uniform and dense sponge-like foam heat insulation layer when the coating is exposed to fire, effectively inhibiting and blocking the spread and spread of fire.It has the characteristics of environmental protection, non-toxic and odorless, thin coating, strong adhesion, good flexibility, etc., and has good insulation and corrosion resistance.The above structure can further improve the flame retardant performance of the cable, reduce the damage of external environmental factors to the cable, and effectively improve the safety performance.

[0018] 4.The material of the first insulating layer and the second insulating layer of the utility model is magnesium hydroxide additive added on the basis of temperature-resistant 125 DEG C crosslinked polyethylene.The addition of magnesium hydroxide additive on the basis of 125 DEG C crosslinked polyethylene can improve the flame retardant performance and reduce smoke generation.The above structure can effectively improve the flame retardant performance of the entire cable, and also reduce the harm of smoke, so that the cable has high safety and environmental protection. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a structural schematic diagram of the utility model;

[0020] Mark: 1 - power line core; 11 - first conductor; 12 - mica tape wrapping layer; 13 - first insulating layer; 2 - signal line core; 21 - second conductor; 21 - second insulating layer; 3 - filling rope; 4 - low smoke halogen free wrapping layer; 5 - oxygen barrier layer; 51 - temperature -sensitive optical fiber; 6 - outer sheath; 7 - fireproof coating. DETAILED DESCRIPTION

[0021] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0023] It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings. In addition, the terms "first," "second," etc. are used only to distinguish the descriptions and are not to be understood as indicating or implying relative importance.

[0024] like Figure 1 As shown, a flame-retardant and impact-resistant composite low-voltage power cable comprises a cable core, a low-smoke halogen-free wrapping layer 4 wrapped around the cable core, an oxygen barrier layer 5 and an outer sheath 6 arranged outside the low-smoke halogen-free wrapping layer 4 from the inside out. The cable core is formed by twisting multiple power cores 1 and multiple signal cores 2, which are symmetrically twisted in a herringbone shape. The interstices between the twisted strands of the cable core are filled with a filling rope 3. The oxygen barrier layer 5 is extruded around the low-smoke halogen-free wrapping layer 4 and is made of highly flame-retardant polystyrene. The outer sheath 6 is extruded around the oxygen barrier layer 5 and is made of impact-resistant and high-temperature-resistant polystyrene. In actual use, the highly flame-retardant polystyrene used in the oxygen barrier layer 5 not only has excellent flame retardancy, but also has good impact resistance and weather resistance. When burned, it extinguishes quickly, with the afterflame lasting only 0-23 seconds, effectively preventing flames. To further enhance the cable's safety, impact resistance, and flame retardancy, the oxygen barrier layer 5 is extruded with an outer sheath 6. The outer sheath 6 is constructed of impact-resistant, high-temperature-resistant polystyrene, which exhibits both impact resistance and high-temperature resistance, maintaining stable performance at relatively high temperatures. Furthermore, it exhibits excellent low-temperature resistance, chemical stability, and electrical insulation. In actual use, the impact-resistant, high-temperature-resistant polystyrene can be the material of existing, publicly available impact-resistant, high-temperature-resistant polystyrene cables. By employing these technical measures, the low-voltage power cable simultaneously performs both power and communication transmission functions while exhibiting excellent flame retardancy and impact resistance, thereby enhancing the safety of the low-voltage power cable.

[0025] The cable core is twisted by three power line cores 1 and three signal line cores 2. The cable core is composed of the power line core 1 and the signal line core 2, which saves space; when laying and installing, it can be done synchronously, reducing the cost of labor. Specifically, the power line core 1 and the signal line core 2 are twisted in a triangular shape. The power line core 1 and the signal line core 2 are twisted in a triangular shape, which helps to improve the flexibility and tensile strength of the cable and helps to reduce electromagnetic interference and improve signal transmission stability.

[0026] The power line core 1 includes a first conductor 1 and a first insulating layer 13 arranged outside the first conductor 1, and a mica tape wrapping layer 12 arranged between the first conductor 1 and the first insulating layer 13. The power line core 1 is a high-flame-retardant power line core. The first conductor 1 is a power line core soft copper conductor, which is composed of three layers of same direction complex twisting. Specifically, the first conductor 1 is a complex twisting structure of several single filaments with a diameter of 0.1-0.5mm of tinned copper wire. The first conductor 1 adopts a complex twisting structure to maintain the high conductivity of the copper wire, meeting the electrical transmission requirements. The tinned layer enhances corrosion resistance and is suitable for humid, acidic and alkaline environments. The multi-strand twisting design makes the power line core 1 have excellent flexibility and bending fatigue resistance. The material of the mica tape wrapping layer 12 is mica tape with a thickness of 0.15mm and a width of 15-60mm, which is wrapped outside the first conductor 1 in an overlapping wrapping structure to form the mica tape wrapping layer 12. Mica tape can generally withstand high temperatures of 750-1000℃, ensuring that it can still maintain excellent insulation performance in high temperature environments. At the same time, it also has good environmental performance, does not contain asbestos, and will not produce toxic gases at high temperatures; it also has the characteristics of acid and alkali resistance, anti-corona, anti-radiation, and excellent flame retardant performance. The material of the first insulating layer 13 is flame-retardant cross-linked polyethylene, and the extrusion thickness is 0.7-1.8mm. Flame-retardant cross-linked polyethylene has excellent environmental resistance, chemical corrosion resistance, creep resistance, electrical properties, insulation properties, and temperature resistance. The power line core 1 with the above structure has excellent flexibility and bending fatigue resistance, as well as excellent flame retardant performance and environmental resistance.

[0027] The signal line core 2 is composed of a second conductor 21 and a second insulating layer 22. Specifically, the second conductor 21 is a power line core 1 soft copper conductor composed of three layers of same direction complex twisting. The second conductor 21 is a complex twisting structure of several single filaments with a diameter of 0.1-0.5mm of tinned copper wire; the second insulating layer 22 is extruded outside the second conductor 21, and the material of the second insulating layer 22 is cross-linked polyethylene. Cross-linked polyethylene has excellent chemical corrosion resistance, creep resistance, electrical properties, heat resistance, and good insulation properties. The signal line core 2 with the above structure has excellent flexibility and bending fatigue resistance, good insulation properties, and excellent flame retardant performance and environmental resistance.

[0028] The cable core is provided with a low-smoke halogen-free wrapping layer 4. Specifically, the low-smoke halogen-free wrapping layer 4 is made of low-smoke halogen-free flame-retardant tape material. The low-smoke halogen-free flame-retardant tape is a flame-retardant material that produces a low amount of smoke when burning and does not contain halogen. It has excellent heat resistance, impact resistance, and fireproof performance, and can achieve UL94 V-0 fireproof grade. At the same time, it has stable chemical properties and does not release corrosive or acidic gases. By providing a low-smoke halogen-free wrapping layer 4 made of low-smoke halogen-free flame-retardant tape material outside the cable core, the flame-retardant performance, heat resistance, and impact resistance of the cable can be effectively improved.

[0029] The stranded gap of the cable core is filled with a filling rope 3. In actual use, the filling rope 3 is a flame-retardant filling rope 3. This technical measure can effectively improve the flame-retardant performance and safety performance of the cable.

[0030] An oxygen barrier layer 5 is provided outside the low-smoke halogen-free wrapping layer 4, and the oxygen barrier layer 5 is extruded outside the low-smoke halogen-free wrapping layer 4. The material of the oxygen barrier layer 5 is high-flame-retardant polystyrene. The thickness of the oxygen barrier layer 5 is 1.6 mm or more. The high-flame-retardant polystyrene used in the oxygen barrier layer 5 not only has excellent flame retardancy, but also has good impact resistance and weather resistance. The above structure can further improve the flame retardancy of the cable, and also makes the cable have good impact resistance and weather resistance.

[0031] The outer sheath 6 is extruded outside the oxygen barrier layer 5, and the material of the outer sheath 6 is impact-resistant high-temperature-resistant polystyrene. Specifically, the outer sheath 6 is made of impact-resistant high-temperature-resistant polystyrene cable material, and the thickness of the outer sheath 6 is 1.8 mm or more. The impact-resistant high-temperature-resistant polystyrene has both impact resistance and high-temperature resistance, and can maintain stable performance at high temperatures. At the same time, it also has excellent low-temperature resistance, chemical stability, and electrical insulation. The above structure can further improve the high-temperature resistance, impact resistance, and insulation performance of the cable.

[0032] The oxygen barrier layer 5 contains temperature-sensitive optical fibers 51. Specifically, four temperature-sensitive optical fibers 51 are uniformly arranged in the circumferential direction inside the oxygen barrier layer 5. By arranging the temperature-sensitive optical fibers 51, the temperature change of the cable can be monitored in real time, so that existing safety hazards can be discovered and handled in a timely manner. This technical measure can effectively enhance the safety performance of the cable.

[0033] The outer sheath 6 is coated with a fireproof coating 7 on the outside. For example, a layer of cable fireproof paint, such as YDAH-102 cable fireproof paint, is coated on the outside of the outer sheath 6. YDAH-102 cable fireproof paint is a new type of fireproof paint. When the coating is on fire, it can generate a uniform and dense sponge-like foam heat insulation layer, effectively inhibiting and blocking the spread and spread of fire. It has the characteristics of environmental protection, non-toxic and odorless, thin coating, strong adhesion, good flexibility, etc., and has good insulation and corrosion prevention functions. The above structure can further improve the flame retardant performance of the cable, reduce the damage of external environmental factors to the cable, and effectively improve the safety performance.

[0034] Example 2

[0035] The other contents of this embodiment are the same as those of Example 1, except that the material of the first insulating layer 13 covering the power line core 1 and the second insulating layer 22 covering the signal line core 2 is 125℃-resistant cross-linked polyethylene with magnesium hydroxide additive. The addition of magnesium hydroxide additive to the 125℃-resistant cross-linked polyethylene improves its flame-retardant performance and reduces smoke generation. Specifically, magnesium hydroxide, as a flame-retardant additive, can form a hard carbon layer when the polyethylene material burns, preventing the spread of fire and achieving the purpose of fire prevention. Magnesium hydroxide also has a certain smoke suppression effect, which can reduce the harm of smoke to the human body. The use of the above structure can effectively improve the flame-retardant performance of the entire cable, while also reducing the harm of smoke, making the cable have high safety and environmental protection.

[0036] The above describes the technical solutions provided by the embodiments of the present application in detail. The principles and implementation modes of the embodiments of the present application are described by applying specific examples. The above description of the embodiments is only applicable to help understand the principles of the embodiments of the present application. Meanwhile, for those skilled in the art, the specific implementation modes and application ranges of the embodiments of the present application will be changed, and the above description of the embodiments is not applicable to limit the embodiments of the present application.

Claims

1. A flame retardant and impact resistant composite low-voltage power cable, characterized in that: It includes a cable core, a low-smoke zero-halogen wrapping layer wrapped around the cable core, and an oxygen barrier layer and an outer sheath arranged outside the low-smoke zero-halogen wrapping layer from the inside to the outside; The cable core is formed by twisting a plurality of power line cores and a plurality of signal line cores, wherein the power line cores and the signal line cores are twisted symmetrically in a herringbone shape; the twisted gaps of the cable core are filled with filling ropes; The oxygen barrier layer is extruded outside the low-smoke zero-halogen wrapping layer, and the material of the oxygen barrier layer is highly flame-retardant polystyrene; The outer sheath is extruded outside the oxygen isolation layer, and the material of the outer sheath is impact-resistant and high-temperature-resistant polystyrene.

2. The flame-retardant and impact-resistant composite low-voltage power cable according to claim 1, characterized in that: The oxygen isolation layer contains a temperature-sensitive optical fiber.

3. The flame retardant and impact resistant composite low-voltage power cable according to claim 1, characterized in that: The power line core includes a first conductor and a first insulating layer arranged outside the first conductor, and a mica tape wrapping layer is provided between the first conductor and the first insulating layer.

4. The flame retardant and impact resistant composite low-voltage power cable according to claim 3, characterized in that: The first conductor is formed by twisting a plurality of tinned copper wires; The mica tape wrapping layer is an overlapping wrapping structure of mica tape outside the first conductor; The first insulating layer is extruded outside the mica tape wrapping layer, and the material of the first insulating layer is flame-retardant cross-linked polyethylene.

5. The flame retardant and impact resistant composite low-voltage power cable according to claim 1, characterized in that: The signal wire core consists of a second conductor and a second insulating layer; the second conductor is formed by twisting a plurality of tinned copper wires; the second insulating layer is extruded outside the second conductor, and the material of the second insulating layer is cross-linked polyethylene.

6. The flame-retardant and impact-resistant composite low-voltage power cable according to claim 1, characterized in that: The exterior of the outer sheath is coated with a fire retardant coating.

7. The flame-retardant and impact-resistant composite low-voltage power cable according to claim 1, characterized in that: The filling rope is a flame retardant filling rope.

8. The flame-retardant and impact-resistant composite low-voltage power cable according to claim 1, characterized in that: The material of the low-smoke zero-halogen wrapping layer is a low-smoke zero-halogen flame retardant tape.

Images