CN217086178U

CN217086178U - Low-smoke halogen-free B1-grade flame-retardant grounding cable

Info

Publication number: CN217086178U
Application number: CN202220275058.7U
Authority: CN
Inventors: 朱金龙; 王福志; 李金堂; 黄伟立; 林荣茜; 程海航
Original assignee: Zhejiang Wanma Co Ltd
Current assignee: Zhejiang Wanma Co Ltd
Priority date: 2022-02-10
Filing date: 2022-02-10
Publication date: 2022-07-29
Anticipated expiration: 2032-02-10

Abstract

The utility model discloses a fire-retardant earth cable of low smoke and zero halogen B1 level, including the conductor to and wrap up shielding layer, insulating layer and the insulating shield layer in the conductor outside by interior outside to in proper order, the insulating shield layer is equipped with the high fire-retardant area of a plurality of layers of no halogen low cigarette outward, does not have the low cigarette high fire-retardant outband and still is equipped with fire-retardant B1 level and does not have the fire-retardant sheath of steamed low cigarette. The utility model discloses establish no halogen low cigarette high flame retardant belt and fire-retardant B1 level no halogen low cigarette flame retardant sheath at the outside cover of cable conductor, the halogen gas and the cigarette that produce when helping reducing the cable burning, safety, environmental protection more.

Description

Low-smoke halogen-free B1-grade flame-retardant grounding cable

Technical Field

The utility model relates to the technical field of cables, concretely relates to fire-retardant earthing cable of low smoke and zero halogen B1 level.

Background

With the rapid development of economy and urbanization in China, the requirement on electric energy transmission is higher and higher, the voltage level of a user distribution transformer (transformer substation) in town streets, factories and residential districts with relatively dense building facilities and population is generally increased to 35kV, and cables which are far away from a city center are mainly medium-low voltage power cables with the voltage level of 35kV and below between a national power grid and the user distribution transformer and in the user distribution network. Because the power cable needs to pass through areas with relatively dense building facilities and population, and the fire safety of the areas is more and more emphasized, especially the requirements on the fire resistance and the fire resistance of the cable in places with high requirements on public fire protection and fire safety are also improved, the development of the medium-voltage fire-resistant power cable of 35kV or below is rapid.

The cable material is a general name of plastics for wire and cable insulation and sheaths, and is prepared by taking materials such as rubber, plastics and nylon as base materials and combining auxiliary components such as a plasticizer, a filler, a color master batch, an antioxidant and the like, different cable types and use environments have different requirements on the performance of the cable material, and most of the commercially available cable materials have the defects of scratch resistance, folding resistance, easy corrosion and oxidation of internal metal wires, poor flame retardant property, incapability of considering hardness and toughness, high toxicity during combustion, no resistance to humidity, cold and heat and the like. Efforts are being made to improve the flame retardant properties of cables and to reduce the generation of harmful gases and smoke.

For example, a "fire-retardant polyvinyl chloride insulating fire-resistant power cable" that discloses in chinese patent literature, its publication number is CN112820462A, includes single core cable, single core cable be conductor, fire-resistant mica layer, insulating layer from inside to outside in proper order, single core cable has three, three single core cable twists each other, single core cable outside is equipped with around the band layer, three single core cable is equipped with the filling layer with around band layer clearance department, is inside liner, armor and oversheath layer outward in proper order around the band layer. The cable in the patent has good flame retardant effect, but does not avoid the generation of halogen-containing gas, and the halogen-containing gas easily pollutes the environment and is harmful to human bodies.

SUMMERY OF THE UTILITY MODEL

The utility model relates to an overcome current cable and easily produce halogen-containing gas and cigarette when burning, cause the problem of harm to people and environment, provide a fire-retardant earth cable of low smoke and zero halogen B1 level, when reducing the unexpected burning of cable, the production of halogen-containing gas and cigarette protects environment and human health.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a fire-retardant earthing cable of low smoke and zero halogen B1 level, includes the conductor to and wrap up shielding layer, insulating layer and the insulating shield layer in the conductor outside by interior outside to in proper order, insulating shield layer is equipped with the high fire-retardant area of a plurality of layers of zero halogen low smoke outward, and zero halogen low smoke high fire-retardant outband still is equipped with fire-retardant B1 level zero halogen low smoke flame retardant sheath. Traditional flame retarded cable establishes the polyvinyl chloride product at the conductor overcoat mostly, in case the conflagration breaks out, polyvinyl chloride can release the all harmful halogen gas to environment and human body in the combustion process, and can take place the drippage when burning, if drip very easily cause stretching of conflagration on high tension cable, establish no halogen-free low smoke high flame retardant area and fire-retardant B1 level no halogen-free low smoke flame retardant sheath in the outside cover of cable conductor in this application, the halogen gas and the cigarette that produce when helping reducing the cable burning, and is safer, the environmental protection.

Preferably, a semiconductive nylon belt and an armor layer are sequentially arranged between the insulation shielding layer and the halogen-free low-smoke high-flame-retardant belt from inside to outside. The armor adopts metal material to make, has certain intensity, can avoid the cable to take place to buckle the damage, and the melting point of metal is higher, when the inside or outside conflagration breaing out of cable, can effectively block stretching of intensity of a fire.

Preferably, a temperature measuring optical fiber is arranged in the armor layer. The temperature measurement optical fiber can be used for detecting the temperature inside the cable and conducting temperature data to help workers to timely react to the temperature change condition inside the cable.

Preferably, the temperature measuring optical fibers are arranged in the armor layer at intervals uniformly along the circumferential direction of the axis of the conductor. The temperature measuring optical fibers are uniformly arranged in the armored layer at intervals along the circumferential direction of the axis of the conductor, so that the temperature measuring optical fibers can help workers to accurately and comprehensively observe the change condition of the internal temperature of the cable, and the use amount of the temperature measuring cable can be properly reduced.

Preferably, the armor layer is composed of a plurality of copper wires and is uniformly distributed along the circumferential direction of the axis of the conductor. The copper wire has certain ductility and intensity, can provide installation space for temperature measurement optic fibre along conductor axle center circumference evenly distributed, even the cable takes place to buckle, the effort of production can be acted on the copper wire, and can not direct action in the temperature measurement optic fibre, helps protecting the temperature measurement optic fibre.

Preferably, the halogen-free low-smoke high-flame-retardant belt has at least 4 layers, and the average overlapping rate is not less than 25%. Set up the high fire-retardant area of multilayer zero halogen low cigarette outside the conductor, can effectively promote the fire behaviour and the fire resistance of cable, and the average setting of taking the lid rate of the high fire-retardant area of zero halogen low cigarette is not less than 25%, and inside the cable can be avoided invading to outside flame in reducible cable inner structure's the area that exposes, also can avoid the inside flame of cable to spill over.

Preferably, the flame-retardant B1-grade halogen-free low-smoke flame-retardant sheath is made of polyolefin materials. The flame-retardant B1-grade halogen-free low-smoke flame-retardant sheath and the halogen-free low-smoke high-flame-retardant belt act together to further improve the flame-retardant performance and the fire resistance of the cable, and the polyolefin material belongs to a hydrophobic material and can allow surface moisture to permeate into the cable; compared with a cable containing halogen, the cable made of the polyolefin material is more environment-friendly, does not generate halogen when heated and burnt, does not harm the environment and human bodies, and has the advantages of high speed and low cost for making the olefin material.

Therefore, the utility model discloses following beneficial effect has: (1) the halogen gas and smoke generated during cable combustion are reduced, and the cable is safer and more environment-friendly; (2) the arrangement of the temperature measuring optical fiber in the cable can help workers to detect the temperature change in the cable in real time and respond well and timely.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

In the figure: 1. conductor, 2, shielding layer, 3, insulating layer, 4, insulating shielding layer, 5, no halogen low smoke high flame retardant belt, 6, flame retardant B1 grade no halogen low smoke flame retardant sheath, 7, semiconductive nylon belt, 8, armor, 9, temperature measuring optical fiber.

Detailed Description

The invention is further described with reference to the accompanying drawings and the detailed description.

As shown in fig. 1, a fire-retardant earth cable of low smoke and zero halogen B1 level, including conductor 1 to and wrap up shielding layer 2, insulating layer 3 and insulating and shielding layer 4 in the conductor 1 outside by inside to outside in proper order, insulating and shielding layer 4 is equipped with a plurality of layers of no halogen low smoke high flame retardant belt 5 outward, and no halogen low smoke high flame retardant belt 5 still is equipped with fire-retardant B1 level no halogen low smoke flame retardant sheath 6 outward. Traditional flame retarded cable establishes the polyvinyl chloride product at 1 overcoat of conductor mostly, in case the conflagration breaks out, polyvinyl chloride can release the halogen gas that is all harmful to environment and human body in the combustion process, and can take place the drippage when burning, if drip and initiate stretching of conflagration on high tension cable very easily, establish halogen-free low smoke high flame retardant belt 5 and fire-retardant B1 level halogen-free low smoke flame retardant sheath 6 at 1 outside cover of cable conductor in the application, the halogen gas and the cigarette that produce when helping reducing the cable burning, and is safer, the environmental protection.

Specifically, a semiconductive nylon belt 7 and an armor layer 8 are sequentially arranged between the insulation shielding layer 4 and the halogen-free low-smoke high-flame-retardant belt 5 from inside to outside. Armor 8 adopts metal material to make, has certain intensity, can avoid the cable to take place to buckle the damage, and the melting point of metal is higher, when the inside or outside conflagration breaing out of cable, can effectively block stretching of intensity of a fire.

Specifically, a temperature measuring optical fiber 9 is arranged in the armor layer 8. The temperature measuring optical fiber 9 can be used for detecting the temperature inside the cable and conducting temperature data to help workers to timely react to the temperature change condition inside the cable.

Specifically, the temperature measuring optical fibers 9 are arranged in the armor layer 8 at even intervals along the axial center circumference of the conductor 1. The temperature measuring optical fibers 9 are uniformly arranged in the armored layer 8 at intervals along the axial center circumference of the conductor 1, so that the change condition of the internal temperature of the cable can be accurately and comprehensively observed by workers, and the use amount of the temperature measuring cable can be properly reduced.

Specifically, the armor layer 8 is composed of a plurality of copper wires and is uniformly distributed along the axial center circumference of the conductor 1. The copper wire has certain ductility and intensity, can provide installation space for temperature measurement optic fibre 9 along 1 axle center circumference evenly distributed of conductor, even the cable takes place to buckle, the effort of production can be acted on the copper wire, and can not direct action in temperature measurement optic fibre 9, helps protecting temperature measurement optic fibre 9.

Specifically, the halogen-free low-smoke high-flame-retardant belt 5 has at least 4 layers, and the average overlapping rate is not less than 25%. Set up the high fire-retardant area of multilayer zero halogen low smoke 5 outside conductor 1, can effectively promote the fire behaviour and the fire resistance of cable, and the setting that the average rate of taking the lid of the high fire-retardant area of zero halogen low smoke 5 is not less than 25%, and the area that exposes of reducible cable inner structure can avoid outside flame to invade inside the cable, also can avoid the inside flame of cable to spill over.

Specifically, the flame-retardant B1-grade halogen-free low-smoke flame-retardant sheath 6 is made of polyolefin material. The flame-retardant B1-grade halogen-free low-smoke flame-retardant sheath 6 and the halogen-free low-smoke high-flame-retardant belt 5 act together to further improve the flame-retardant performance and the fire resistance of the cable, and the polyolefin material belongs to a hydrophobic material and can allow surface moisture to permeate into the cable; compared with a cable containing halogen, the cable made of the polyolefin material is more environment-friendly, does not generate halogen when heated and burnt, does not harm the environment and human bodies, and has the advantages of high speed and low cost for making the olefin material.

Claims

1. The utility model provides a fire-retardant earthing cable of low smoke and zero halogen B1 level, includes conductor (1) to and wrap up shielding layer (2), insulating layer (3) and insulating shield (4) in the conductor (1) outside by interior outside to in proper order, its characterized in that, insulating shield (4) are equipped with a plurality of layers of no halogen low smoke high flame retardant belt (5) outward, and no halogen low smoke high flame retardant belt (5) still are equipped with fire-retardant B1 level no halogen low smoke flame retardant sheath (6) outward.

2. The low-smoke zero-halogen B1-grade flame-retardant grounding cable according to claim 1, wherein a semiconductive nylon tape (7) and an armor layer (8) are sequentially arranged between the insulation shielding layer (4) and the halogen-free low-smoke high-flame-retardant tape (5) from inside to outside.

3. The low smoke zero halogen B1-grade flame retardant grounding cable according to claim 2, wherein a temperature measuring optical fiber (9) is arranged in the armor layer (8).

4. The low smoke zero halogen B1-grade flame retardant grounding cable according to claim 3, wherein the temperature measuring optical fibers (9) are uniformly spaced in the armor layer (8) along the axial center of the conductor (1) in the circumferential direction.

5. The low-smoke zero-halogen B1-grade flame-retardant grounding cable according to claim 2, wherein the armor layer (8) is composed of a plurality of copper wires and is uniformly distributed along the circumference of the axis of the conductor (1).

6. The low-smoke zero-halogen B1-grade flame-retardant grounding cable according to claim 1, wherein the halogen-free low-smoke high-flame-retardant tape (5) has at least 4 layers, and the average overlapping rate is not less than 25%.

7. The low smoke zero halogen (B1) grade flame retardant grounding cable according to claim 1, wherein the flame retardant B1 grade halogen free low smoke flame retardant sheath (6) is made of polyolefin material.