Novel B1-level NW-type polypropylene insulating environment-friendly low-voltage power cable

Abstract

The invention discloses a novel B1-level NW-type polypropylene insulating environment-friendly low-voltage power cable, which belongs to the technical field of wires and cables and comprises conductors, a plurality of conductors are mutually twisted, a protective layer is arranged on the outer side of each conductor, a protective layer is arranged on the outer side of the twisted conductors, and a filling layer is arranged in a gap between the protective layer and the protective layer. The outer side of the protection layer is provided with an oxygen isolation layer, and the outer side of the oxygen isolation layer is provided with a sheath layer. The protective layer comprises a fireproof layer, a nylon layer and an insulating layer from inside to outside, the protective layer comprises two layers of glass fiber tapes, and a ceramic silica gel tape is arranged between the glass fiber tapes. According to the invention, the protection layer can bear high temperature and does not change the shape in a certain time, so that stable forms of the fireproof layer, the nylon layer and the insulating layer which are arranged on the outer side of the conductor are ensured, and the situation that in the combustion process of the cable, drippings in a molten state fall to other places, other inflammables are ignited, and a secondary fire is caused is avoided.

Description

Technical Field

[0001] The invention relates to a novel B1NW type polypropylene insulated environmentally friendly low-voltage power cable, belonging to the technical field of wires and cables. Background Art

[0002] In the "Technical Code for Fire Protection of Wires and Cables in Civil Buildings" (DBJ / T 15-226-2021) standard issued by Guangdong Province, higher requirements are put forward for the fire protection performance of wires and cables in civil buildings, including: improvement of cable combustion performance, smoke toxicity control, combustion dripping control, and fire resistance performance of fire trunk lines.

[0003] The shortcomings of existing traditional cables are that the performance of traditional low-smoke halogen-free flame-retardant and fire-resistant cables in fires is difficult to meet the requirements of the new standards. Its defects include: High heat release: Traditional flame-retardant cables release a lot of heat when burning, which will accelerate the spread of fire in a fire. Many drips: Traditional cables are prone to dripping when burning, and these molten droplets may ignite other flammable materials and cause secondary fires. Short fire resistance time: The fire resistance temperature range of traditional cables is 750-800℃, and they can only maintain power supply for up to 90 minutes in a fire, which cannot meet the building's requirements for higher fire resistance.

[0004] Therefore, it is necessary to design a B1 grade NW type cable to solve the above problems. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a new type of B1 grade NW type polypropylene insulated environmentally friendly low-voltage power cable, which solves the problems of high heat release, much falling objects and short fire resistance time of traditional cables.

[0006] The technical problem to be solved by the present invention is achieved by adopting the following technical scheme: a new type of B1 grade NW type polypropylene insulated environmentally friendly low-voltage power cable, comprising

[0007] A conductor, wherein a plurality of the conductors are twisted together.

[0008] A protective layer is arranged on the outside of the conductor, a protective layer is arranged on the outside of the plurality of conductors after being twisted, a filling layer is arranged in the gap between the protective layers, an oxygen isolation layer is arranged on the outside of the protective layer, and a sheath layer is arranged on the outside of the oxygen isolation layer;

[0009] The protective layer includes a fire-resistant layer, a nylon layer, and an insulating layer from the inside to the outside. The protective layer includes a glass fiber tape. The glass fiber tape has two layers, and a ceramic silicone tape is arranged between the glass fiber tapes.

[0010] Preferably, the refractory layer is a calcined mica tape, which is arranged on the outside of the conductor in a wrapping manner.

[0011] Preferably, the nylon layer is a high-temperature nylon belt, which is arranged on the outside of the fire-resistant layer in a wrapped manner.

[0012] Preferably, the insulating layer is thermoplastic polypropylene and is arranged on the outside of the nylon layer in an extruded manner.

[0013] Preferably, the filling layer is a high temperature resistant filling rope, which can ensure the roundness of the cable and can provide buffering.

[0014] Preferably, the glass fiber tape and the ceramic silicone tape are fixed by wrapping.

[0015] Preferably, the oxygen barrier layer is made of polyethylene and is arranged on the outside of the protective layer in an extruded manner.

[0016] Preferably, the sheath layer is made of polyvinyl chloride, the thickness of the sheath layer is greater than that of the oxygen-isolating layer, and the sheath layer is arranged on the outside of the oxygen-isolating layer in an extruded manner.

[0017] The beneficial effects of the present invention are:

[0018] (1) Through the present invention, a plurality of conductors are twisted together, an insulating layer is arranged on the outside of the conductors, a protective layer is arranged on the outside after twisting, a filling layer is arranged in the gap between the conductor and the protective layer, an oxygen-isolating layer is arranged on the outside of the protective layer, and a sheath layer is arranged on the outside of the oxygen-isolating layer. By arranging an oxygen-isolating layer and a sheath layer on the outside of the protective layer, wherein the oxygen-isolating layer is made of polyethylene and fixed on the outside of the protective layer by extrusion, and arranging a sheath layer on the outside of the oxygen-isolating layer, the sheath layer is made of polyvinyl chloride, and the thickness of the sheath layer is greater than the oxygen-isolating layer, it can be ensured that the burning rate of the cable can be reduced when it burns, and the burning of the cable in the case of fire can be reduced, resulting in an accelerated burning rate of the fire. The insulating layer is made of thermoplastic polypropylene material extruded, and the polypropylene material has higher performance, releases less heat when burning, and effectively prevents moisture from entering the fire-resistant layer.

[0019] (2) Through the present invention, the protective layer includes a glass fiber tape, the glass fiber tape has two layers, a ceramic silicone tape is arranged between the glass fiber tapes, and the protective layer is arranged on the outside of the twisted conductor. The protective layer can withstand high temperature and does not change its shape for a certain period of time, thereby ensuring that the fire-resistant layer, nylon layer, and insulating layer arranged on the outside of the conductor are stable in shape, and preventing the molten material inside the cable from dripping to other places during the combustion process, igniting other flammable materials, and causing a secondary fire.

[0020] (3) Through the present invention, a nylon layer is provided in the cable, and the nylon layer is a high-temperature nylon belt, and the high-temperature nylon belt is provided on the outside of the fire-resistant layer in a wrapping manner. The high-temperature nylon belt is fixed in a wrapping manner, has waterproof and moisture-proof properties, can prevent moisture from entering the cable, and avoid the cable as a whole from failing in an environment such as a fire spray. In addition, the nylon layer can also improve the overall fire resistance duration of the cable, and can delay the flame from contacting the fire-resistant layer in the event of a fire, thereby increasing the fire resistance duration and reliability of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the present invention.

[0022] In the figure: 01-protective layer, 02-protective layer, 1-conductor, 2-fire-resistant layer, 3-nylon layer, 4-insulating layer, 5-filling layer, 6-glass fiber tape, 7-ceramic silicone tape, 8-oxygen insulation layer, 9-sheath layer. DETAILED DESCRIPTION

[0023] In order to make the technical means, creative features, objectives and effects of the present invention easier to understand, the present invention is further described below in conjunction with specific embodiments.

[0024] Example 1

[0025] like Figure 1 As shown,

[0026] A novel B1-grade NW-type polypropylene insulated environmentally friendly low-voltage power cable comprises a conductor 1. There are multiple conductors 1, and the conductors 1 are directly connected to each other in a twisted manner.

[0027] A protective layer 01 is arranged on the outside of the conductor, and a protective layer 02 is arranged on the outside of the twisted conductor 1. A filling layer 04 is arranged in the gap between the protective layer 01 and the protective layer 02, an oxygen isolation layer 7 is arranged on the outside of the protective layer 02, and a sheath layer 8 is arranged on the outside of the oxygen isolation layer 7.

[0028] The protective layer 01 includes a fire-resistant layer 2, a nylon layer 3, and an insulating layer 4 from the inside to the outside. The protective layer 02 includes a glass fiber tape 6. The glass fiber tape 6 has two layers, and a ceramic silicone tape 7 is arranged between the glass fiber tapes 6.

[0029] The refractory layer 2 is a calcined mica tape, which is arranged on the outside of the conductor 1 in a wrapping manner. The calcined mica tape is a refractory insulating material made of mica paper as a base material, alkali-free glass fiber cloth or film as a reinforcing material, and silicone as an adhesive, and is made through impregnation, high-temperature baking, and drying. It has high high-temperature resistance, good flexibility, electrical insulation, and is non-toxic and halogen-free. It is usually directly wrapped around the surface of the conductor, with the mica side of the mica tape facing the conductor of the wire and cable, ultimately providing excellent electrical insulation performance in emergency situations of unexpected high temperature or accidental fire. When the cable is in the event of unexpected high temperature or accidental fire, the calcined mica tape can still maintain the integrity of the circuit, prevent the flame from directly contacting the conductor, and extend the fire resistance time.

[0030] A nylon layer 3 is arranged on the outside of the fire-resistant layer 2, wherein the nylon layer is a high-temperature nylon belt, and the high-temperature nylon belt can be arranged on the outside of the fire-resistant layer 2 in a wrapping manner. When the high-temperature nylon belt is wrapped around the fire-resistant layer 2, the overlap rate of the high-temperature nylon belt itself is not less than 30%. It can enhance the protection of the fire-resistant layer. The high-temperature nylon belt has a certain high-temperature resistance. It is tightly wrapped around the outside of the fire-resistant layer 2, forming an additional protective barrier to protect the fire-resistant layer from moisture or other corrosive substances in the environment, thereby extending its fire-resistant effect. In addition, the high-temperature waterproof property of the nylon belt can prevent the water sprayed during fire extinguishing from entering the interior of the cable when a fire occurs, prevent moisture penetration, ensure that the fire-resistant layer 2 can ensure its own stability in the event of a fire, and extend the duration of the cable as a whole in various conditions. The high-temperature nylon belt is fixed by overlapping wrapping, and the overlap rate is not less than 30%, making the nylon layer 3 tighter, thereby improving the overall mechanical strength of the cable. In the event of a fire or other emergency, the cable can better withstand external mechanical impact and avoid damage to the internal structure.

[0031] The nylon layer 2 and the fire-resistant layer 3 are connected by a physical wrapping method. In the overlapping structure, the nylon layer 3 can still be closely attached to the fire-resistant layer 2 under the action of external force, thereby ensuring the structural stability of the cable under high temperature and mechanical impact.

[0032] An insulating layer 4 is arranged on the outside of the fire-resistant layer 2 . The insulating layer 4 is made of thermoplastic polypropylene. The thermoplastic polypropylene is arranged on the outside of the nylon layer 3 in an extruded manner.

[0033] Traditional cable insulation layer uses cross-linked polyethylene. Compared with traditional cables, polypropylene insulation material does not require cross-linking, has lower energy consumption, and can be recycled, reducing the consumption of natural resources and damage to the environment. Polypropylene material has good heat resistance and can withstand higher operating temperatures. Extrusion on the outside not only protects the internal fire-resistant layer and conductor, but also reduces the impact of temperature changes on the internal structure, ensuring that the cable can still operate normally in a high temperature environment. After extrusion, the inside of the conductor 1 forms a closed structure, which can effectively prevent external moisture from penetrating and further protect the internal conductor 1.

[0034] The protective layer 01 includes a fire-resistant layer 2, a nylon layer 3, and an insulating layer 4, which are arranged on the outside of the conductor 1 from the inside to the outside and fit the conductor 1. Multiple conductors 1 are connected in a twisted manner, and a protective layer 01 is arranged on the outside of each conductor 1.

[0035] A protective layer 02 is disposed outside the twisted conductor 1, and a filling layer is disposed between the twisted conductor 1 and the protective layer 02. In this embodiment, four conductors are twisted together, and a filling layer 5 is disposed between the protective layer 02 and the gaps between the twisted conductors.

[0036] The filling layer 5 is a high temperature resistant filling rope. The filling layer 5 is attached to the gap at the edge of the twisted conductor 1 using the high temperature resistant filling rope, which can make the twisted conductor 1 more round and has a certain buffering effect.

[0037] The protective layer 02 includes a glass fiber tape 6 and a ceramic silicone tape 7, wherein the glass fiber tape 6 has two layers, and the ceramic silicone tape 7 is arranged between the glass fiber tapes 6. The glass fiber tape 6 and the ceramic silicone tape 7 are fixed to the outside of the conductor 1 by wrapping. The glass fiber tape 6 is divided into two layers, which are respectively located on the inner and outer sides of the ceramic silicone tape 7 to play a protective and supporting role. The glass fiber tape is tightly wound by wrapping to ensure the tightness of the overall structure. The ceramic silicone tape 7 is sandwiched between the two layers of glass fiber tape 6, which plays a role of core heat insulation and fire resistance. The wrapping method is also adopted to ensure that it is closely combined with the glass fiber tape 6 to form a multi-layer protective structure. Overall wrapping and fixing: The glass fiber tape and the ceramic silicone tape are alternately wrapped around the outside of the conductor. This structural design makes the layers of materials fit closely together, ensuring the stability between the layers in a high temperature environment, and is not easy to fall off or shift.

[0038] The glass fiber tape 6 and the ceramic silicone tape 7 will not melt or drip at high temperatures, which effectively reduces the generation of molten droplets in a fire, avoids secondary combustion, and reduces the generation of smoke.

[0039] An oxygen-isolating layer 8 is arranged on the outside of the protective layer 2. The oxygen-isolating layer 8 is made of polyethylene. The polyethylene is arranged on the outside of the protective layer in an extruded manner and has good flame retardant and heat-insulating properties.

[0040] A sheath layer 9 is arranged on the outside of the oxygen-isolating layer 8, wherein the sheath layer 9 is arranged on the outside of the oxygen-isolating layer in an extruded manner, and the sheath layer 9 includes polyvinyl chloride, which is arranged on the outside of the oxygen-isolating layer 8 in an extruded manner. The oxygen-isolating layer 8 is located between the protective layer 02 and the sheath layer 9, forming a multi-layer protection to ensure a tight fit between the layers and avoid gaps; the sheath layer 9 is arranged on the outside of the oxygen-isolating layer in an extruded manner, and is coated on the outside of the oxygen-isolating layer, providing ultimate protection for the entire cable structure. The oxygen-isolating layer 8 can block external oxygen, reduce the direct contact of the cable with oxygen in a fire, and thus effectively inhibit the continuation of combustion. The oxygen-isolating layer 8 can delay the spread of flames to the inner layer in a high-temperature environment, providing longer protection for the inside of the cable.

[0041] The thickness of the sheath layer 9 is greater than that of the oxygen barrier layer 8, which makes the cable more advantageous in terms of mechanical protection, environmental adaptability and flame retardancy. It also enhances the durability and safety of the cable and is suitable for high-demand application scenarios.

[0042] The basic principles, main features and advantages of the present invention are shown and described above. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A new type of B1 grade NW type polypropylene insulated environmentally friendly low-voltage power cable, including A conductor, wherein a plurality of the conductors are twisted together. Features: A protective layer is arranged on the outside of the conductor, a protective layer is arranged on the outside of the plurality of conductors after being twisted, a filling layer is arranged in the gap between the protective layers, an oxygen isolation layer is arranged on the outside of the protective layer, and a sheath layer is arranged on the outside of the oxygen isolation layer; The protective layer includes a fire-resistant layer, a nylon layer, and an insulating layer from the inside to the outside. The protective layer includes a glass fiber tape. The glass fiber tape has two layers, and a ceramic silicone tape is arranged between the glass fiber tapes.

2. According to claim 1, a new type of B1 grade NW type polypropylene insulated environmentally friendly low-voltage power cable is characterized by: The refractory layer is a calcined mica tape, which is arranged on the outside of the conductor in a wrapping manner.

3. A new type of B1 grade NW type polypropylene insulated environmentally friendly low-voltage power cable according to claim 1, characterized in that: The nylon layer is a high-temperature nylon belt, which is arranged on the outside of the fire-resistant layer in a wrapped manner.

4. A new type of B1 grade NW type polypropylene insulated environmentally friendly low-voltage power cable according to claim 1, characterized in that: The insulating layer is thermoplastic polypropylene and is arranged on the outside of the nylon layer in an extruded manner.

5. A new type of B1 grade NW type polypropylene insulated environmentally friendly low-voltage power cable according to claim 1, characterized in that: The filling layer is a high temperature resistant filling rope, which can ensure the roundness of the cable and provide buffering.

6. A new type of B1 grade NW type polypropylene insulated environmentally friendly low-voltage power cable according to claim 1, characterized in that: The glass fiber tape and the ceramic silicone tape are fixed by wrapping.

7. A new type of B1 grade NW type polypropylene insulated environmentally friendly low-voltage power cable according to claim 1, characterized in that: The oxygen barrier layer is made of polyethylene and is arranged on the outer side of the protective layer in an extrusion package manner.

8. A new type of B1 grade NW type polypropylene insulated environmentally friendly low-voltage power cable according to claim 1, characterized in that: The sheath layer is made of polyvinyl chloride, the thickness of the sheath layer is greater than that of the oxygen-isolating layer, and the sheath layer is arranged on the outside of the oxygen-isolating layer in an extruded manner.

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