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

Abstract

The utility model 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 utility model, the protection layer can bear high temperature and does not change the shape in a certain period of time, so that the 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, dripping objects in a molten state fall to other places, other inflammables are ignited, and a secondary fire disaster is caused is avoided.

Description

Technical Field

[0001] This utility model relates to a novel B1NW type polypropylene insulated environmentally friendly low-voltage power cable, belonging to the field of wire and cable technology. Background Technology

[0002] The shortcomings of existing traditional cables are evident in their inability to meet the new standards for fire resistance, particularly the performance of traditional low-smoke halogen-free flame-retardant fire-resistant cables. These shortcomings include: high heat release: traditional flame-retardant cables release a large amount of heat when burning, which accelerates the spread of fire. Excessive dripping: traditional cables easily produce dripping material during combustion; these molten droplets may ignite other flammable materials, causing secondary fires. Short fire resistance time: traditional cables have a fire resistance temperature range of 750–800℃, and can only maintain power supply for a maximum of 90 minutes in a fire, failing to meet the higher fire resistance requirements of buildings.

[0003] Therefore, a B1-grade NW type cable needs to be designed to solve the above problems. Utility Model Content

[0004] The technical problem to be solved by this utility model 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, many falling objects, and short fire resistance time of traditional cables.

[0005] The technical problem to be solved by this utility model is achieved by the following technical solution: a novel B1-grade NW-type polypropylene insulated environmentally friendly low-voltage power cable, comprising...

[0006] Conductors, multiple conductors twisted together

[0007] A protective layer is provided on the outside of the conductor, a protective layer is provided on the outside of the stranded multiple conductors, a filling layer is provided in the gap between the protective layer and the protective layer, an oxygen barrier layer is provided on the outside of the protective layer, and a sheath layer is provided on the outside of the oxygen barrier layer.

[0008] The protective layer comprises, from the inside out, a fire-resistant layer, a nylon layer, and an insulating layer. The protective layer includes fiberglass tape, which consists of two layers, with a ceramic silicone tape placed between the fiberglass tapes.

[0009] Preferably, the refractory layer is calcined mica tape, which is wrapped around the outside of the conductor.

[0010] Preferably, the nylon layer is a high-temperature nylon strip, which is wrapped around the outside of the refractory layer.

[0011] Preferably, the insulating layer is thermoplastic polypropylene and is extruded onto the outside of the nylon layer.

[0012] Preferably, the filling layer is a high-temperature resistant filling rope, which can ensure the cable is round and can provide cushioning.

[0013] Preferably, the fiberglass tape and the ceramic silicone tape are fixed by wrapping.

[0014] Preferably, the oxygen barrier layer is made of polyethylene and is extruded onto the outside of the protective layer.

[0015] Preferably, the sheath layer is made of polyvinyl chloride, the thickness of the sheath layer is greater than that of the oxygen barrier layer, and the sheath layer is extruded onto the outside of the oxygen barrier layer.

[0016] The beneficial effects of this utility model are:

[0017] (1) In this utility model, multiple conductors are twisted together, an insulation layer is provided on the outside of the conductors, a protective layer is provided on the outside of the twisted conductors, a filling layer is provided in the gap between the conductors and the protective layer, an oxygen barrier layer is provided on the outside of the protective layer, and a sheath layer is provided on the outside of the oxygen barrier layer. By providing an oxygen barrier layer and a sheath layer on the outside of the protective layer, wherein the oxygen barrier layer is made of polyethylene and is fixed on the outside of the protective layer by extrusion, and a sheath layer is provided on the outside of the oxygen barrier layer, the sheath layer is made of polyvinyl chloride and the thickness of the sheath layer is greater than that of the oxygen barrier layer, it can ensure that the cable can reduce the burning rate when burning, reduce the cable from burning in the event of a fire, and prevent the fire from accelerating. The insulation layer is made of thermoplastic polypropylene material extruded. Polypropylene material has high performance and releases less heat when burning, effectively preventing moisture from entering the refractory layer.

[0018] (2) Through this utility model, the protective layer includes fiberglass tape, which has two layers. A ceramic silicone tape is set between the fiberglass tapes. The protective layer is set on the outside of the stranded conductor. The protective layer can withstand high temperature and does not change its shape within a certain period of time, ensuring the stability of the shape of the fire-resistant layer, nylon layer and insulation layer set on the outside of the conductor. This prevents the dripping material in the molten state inside the cable from falling to other places during the burning process, igniting other flammable materials and causing a secondary fire.

[0019] (3) This invention incorporates a nylon layer within the cable. The nylon layer is a high-temperature nylon tape, which is wrapped around the outside of the fire-resistant layer. This wrapping method provides waterproof and moisture-proof properties, preventing moisture from entering the cable and avoiding overall cable failure under fire conditions such as spraying. Furthermore, the nylon layer enhances the overall fire resistance duration of the cable, delaying flame contact with the fire-resistant layer during a fire, thus increasing the cable's fire resistance duration and reliability. Attached Figure Description

[0020] Figure 1This is a schematic diagram of the structure of this utility model.

[0021] In the diagram: 01-protective layer, 02-protective layer, 1-conductor, 2-fire resistant layer, 3-nylon layer, 4-insulating layer, 5-filling layer, 6-fiberglass tape, 7-ceramic silicone tape, 8-oxygen barrier layer, 9-sheath layer. Detailed Implementation

[0022] In order to make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0023] Example 1

[0024] like Figure 1 As shown,

[0025] A new type of B1 grade NW type polypropylene insulated environmentally friendly low-voltage power cable includes conductor 1, which consists of multiple conductors that are directly connected to each other by twisting.

[0026] A protective layer 01 is provided on the outside of the conductor, and a protective layer 02 is provided on the outside of the stranded conductor 1. A filling layer 04 is provided in the gap between the protective layer 01 and the protective layer 02. An oxygen barrier layer 7 is provided on the outside of the protective layer 02, and a sheath layer 8 is provided on the outside of the oxygen barrier layer 7.

[0027] The protective layer 01 includes a fire-resistant layer 2, a nylon layer 3, and an insulating layer 4 from the inside out. The protective layer 02 includes a fiberglass tape 6, which has two layers, and a ceramic silicone tape 7 is placed between the fiberglass tapes 6.

[0028] The refractory layer 2 is calcined mica tape, which is wrapped around the outside of conductor 1. The calcined mica tape uses mica paper as the base material, alkali-free fiberglass cloth or film as reinforcement, and silicone as an adhesive. It is a refractory insulation material 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 conductor surface, with the mica side of the mica tape facing the conductor of the wire / cable, ultimately providing excellent electrical insulation performance in emergency situations such as accidental high temperatures or fires. When the cable experiences accidental high temperatures or fires, the calcined mica tape can still maintain circuit integrity, prevent flames from directly contacting the conductor, and extend the fire resistance time.

[0029] A nylon layer 3, made of high-temperature nylon tape, is installed on the outside of the fire-resistant layer 2. This high-temperature nylon tape is wrapped around the outside of the fire-resistant layer 2, with an overlap rate of no less than 30%. This enhances the protection of the fire-resistant layer. The high-temperature nylon tape, with its high-temperature resistance, tightly wraps around the outside of the fire-resistant layer 2, forming an additional protective barrier that protects the fire-resistant layer from moisture or other corrosive substances in the environment, thus extending its fire resistance. Furthermore, the high-temperature waterproof properties of the nylon tape prevent water sprayed during firefighting from entering the cable's interior, ensuring the stability of the fire-resistant layer 2 under fire conditions and extending the overall lifespan of the cable in various situations. The overlapping wrapping method, with an overlap rate of no less than 30%, makes the nylon layer 3 more compact, improving the overall mechanical strength of the cable. In fire or other emergency situations, the cable can better withstand external mechanical impacts, preventing damage to its internal structure.

[0030] The nylon layer 2 and the fire-resistant layer 3 are connected by a physical wrapping method. In this overlapping structure, the nylon layer 3 remains tightly attached to the fire-resistant layer 2 even under external forces, thus ensuring the structural stability of the cable under high temperatures and mechanical impacts.

[0031] An insulating layer 4 is provided on the outside of the refractory layer 2. The insulating layer 4 is thermoplastic polypropylene, which is extruded and placed on the outside of the nylon layer 3.

[0032] Traditional cables use cross-linked polyethylene (XLPE) insulation. Compared to traditional cables, polypropylene insulation eliminates the need for cross-linking, resulting in lower energy consumption and recyclability, reducing resource depletion and environmental damage. Polypropylene also boasts superior temperature resistance, allowing it to withstand higher operating temperatures. Extrusion on the outside not only protects the internal fire-resistant layer and conductor but also minimizes the impact of temperature changes on the internal structure, ensuring normal cable operation even in high-temperature environments. The extrusion process creates a sealed structure within conductor 1, effectively preventing moisture penetration and further protecting the internal conductor.

[0033] The protective layer 01 includes a fire-resistant layer 2, a nylon layer 3, and an insulating layer 4, which are arranged from the inside to the outside of the conductor 1 and are attached to the conductor 1. Multiple conductors 1 are connected by twisting, and each conductor 1 has a protective layer 01 on its outer side.

[0034] A protective layer 02 is provided on the outer side of the stranded conductor 1, and a filler layer is provided between the stranded conductor 1 and the protective layer 02. In this embodiment, four conductors are stranded together, and a filler layer 5 is provided between the stranded conductors and the protective layer 02.

[0035] 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 stranded conductor 1 with the high-temperature resistant filling rope, which can make the stranded conductor 1 more round and has a certain buffering effect.

[0036] The protective layer 02 includes fiberglass tape 6 and ceramic silicone tape 7. The fiberglass tape 6 consists of two layers, with the ceramic silicone tape 7 positioned between them. The fiberglass tape 6 and ceramic silicone tape 7 are fixed to the outside of the conductor 1 by wrapping. The fiberglass tape 6, divided into two layers, is located on the inner and outer sides of the ceramic silicone tape 7, providing protection and support. The fiberglass tape is tightly wrapped to ensure overall structural tightness. The ceramic silicone tape 7, sandwiched between the two layers of fiberglass tape 6, provides core heat insulation and fire resistance. It is also wrapped to ensure a tight bond with the fiberglass tape 6, forming a multi-layered protective structure. Overall wrapping and fixing: The fiberglass tape and ceramic silicone tape are alternately wrapped around the outside of the conductor. This structural design ensures a tight fit between the layers, guaranteeing stability between layers in high-temperature environments and preventing detachment or displacement.

[0037] Fiberglass tape 6 and ceramic silicone tape 7 will not melt or drip at high temperatures, effectively reducing the generation of molten droplets in a fire, preventing secondary combustion, and reducing the generation of smoke.

[0038] An oxygen barrier layer 8 is provided on the outside of the protective layer 2. The oxygen barrier layer 8 is made of polyethylene. The polyethylene is extruded and placed on the outside of the protective layer, and has good flame retardant and heat insulation properties.

[0039] A sheath layer 9 is provided outside the oxygen barrier layer 8. The sheath layer 9, composed of polyvinyl chloride, is extruded and installed on the outside of the oxygen barrier layer 8. The oxygen barrier layer 8 is located between the protective layer 02 and the sheath layer 9, forming a multi-layered protection that ensures a tight fit between layers and avoids gaps. The sheath layer 9, extruded and installed outside the oxygen barrier layer, covers the outside of the oxygen barrier layer, providing final protection for the entire cable structure. The oxygen barrier layer 8 can block external oxygen, reducing the cable's direct contact with oxygen in a fire, thereby effectively inhibiting the continuation of combustion. In high-temperature environments, the oxygen barrier layer 8 can delay the spread of flames to the inner layers, providing longer-lasting protection for the cable's interior.

[0040] The thickness of the sheath layer 9 is greater than that of the oxygen barrier layer 8, giving the cable advantages in mechanical protection, environmental adaptability, and flame retardant properties. It also enhances the cable's durability and safety, making it suitable for demanding applications.

[0041] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments, and various changes and modifications can be made without departing from the spirit and scope of this utility model. All such changes and modifications fall within the scope of protection claimed by this utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A novel B1-grade NW-type polypropylene insulated environmentally friendly low-voltage power cable, comprising: Conductors, multiple conductors of the above are twisted together. Its features are: A protective layer is provided on the outside of the conductor, a protective layer is provided on the outside of the stranded multiple conductors, a filling layer is provided in the gap between the protective layer and the protective layer, an oxygen barrier layer is provided on the outside of the protective layer, and a sheath layer is provided on the outside of the oxygen barrier layer. The protective layer comprises, from the inside out, a fire-resistant layer, a nylon layer, and an insulating layer. The protective layer includes fiberglass tape, which consists of two layers, with a ceramic silicone tape placed between the fiberglass tapes.

2. The novel B1-grade NW-type polypropylene insulated environmentally friendly low-voltage power cable according to claim 1, characterized in that: The refractory layer is calcined mica tape, which is wrapped around the outside of the conductor.

3. The novel 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 strip, which is wrapped around the outside of the refractory layer.

4. The novel 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 extruded onto the outside of the nylon layer.

5. A novel 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 cable is round and can provide cushioning.

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

7. A novel 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 extruded onto the outside of the protective layer.

8. A novel 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, and the thickness of the sheath layer is greater than that of the oxygen barrier layer. The sheath layer is extruded and disposed on the outside of the oxygen barrier layer.

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