CN223598432U

CN223598432U - A halogen-free, low-smoke, flame-retardant, B1-grade fire-resistant flexible cable

Info

Publication number: CN223598432U
Application number: CN202423120053.5U
Authority: CN
Inventors: 刁凡东; 李欣; 黄昌双; 魏光辉; 魏景权; 康喜文; 周光喜
Original assignee: FUJIAN NANPING SUN CABLE CO LTD
Current assignee: FUJIAN NANPING SUN CABLE CO LTD
Priority date: 2024-12-17
Filing date: 2024-12-17
Publication date: 2025-11-25
Anticipated expiration: 2034-12-17

Abstract

The utility model discloses a halogen-free low-smoke flame-retardant B1-level fire-resistant flexible cable which comprises a soft copper conductor, a fire-resistant wrapping tape, a double insulating layer, a filling layer, a flame-retardant isolation layer and a sheath layer, wherein the fire-resistant wrapping tape is wrapped on the soft copper conductor, the double insulating layer is uniformly extruded on the fire-resistant wrapping tape to form a wire core, the inner layer of the double insulating layer adopts ethylene propylene rubber insulating material, the outer layer of the double insulating layer adopts low-smoke halogen-free flame-retardant ethylene propylene rubber, a plurality of wire cores are twisted to form a cable core, the wire core is gap-filled with halogen-free low-smoke flame-retardant filling ropes to form the filling layer, the flame-retardant isolation layer is wrapped outside the cable core, and the sheath layer is extruded outside the flame-retardant isolation layer. The utility model has high insulation resistance, softness, wear resistance and oil resistance, is used for connecting electrical equipment with rated voltage of 0.6/1kV and below, has flame retardant grade reaching the B1 grade requirement in GB31247, the grade of the combustion droppings/particles reaches d1 grade, the toxicity of the flue gas reaches T0 grade, the corrosiveness reaches a1 grade, the fire resistance meets the requirements of GB/T19666, and the composite material is suitable for personnel-intensive occasions such as hospitals, subways, stations and the like.

Description

Halogen-free low-smoke flame-retardant B1-level fireproof flexible cable

Technical Field

The utility model relates to a cable, in particular to a halogen-free low-smoke flame-retardant B1-level fire-resistant flexible cable with rated voltage of 0.6/1kV or below.

Background

At present, the common flexible cables in the market are rubber sleeve flexible cables YZW and YCW, polyvinyl chloride (PVC) plastic insulation flexible cables RV and RVV and the like. Rubber sleeves are generally made of ethylene propylene rubber insulation (EPR), natural Rubber (NR) or chlorinated polyethylene sheaths (CPE), the Natural Rubber (NR) is not flame-retardant, even if a large amount of flame retardant is added, the flame-retardant effect is not ideal, the chlorine content of polyvinyl chloride (PVC) and Chlorinated Polyethylene (CPE) is high, and extremely corrosive gas is released during combustion, and the representative component is chlorine, which is an extremely corrosive, irritating, choking and unpleasant-tasting gas. Has strong irritation to the respiratory system of personnel in the fire scene and even causes injury to different degrees. After the chlorine gas is combined with water, hydrogen chloride (hydrochloric acid) is formed, and the corrosion to electric equipment is very high.

The low-smoke halogen-free flame-retardant cable is generally insulated by crosslinked polyethylene (XLPE) and a polyolefin sheath, and can meet the B1-level requirement of low-smoke halogen-free flame retardance, but cannot be softer, the minimum bending radius of the cable is generally not less than 15 times, and is difficult to achieve 6 times or less. Especially, the polyolefin sheath has the defects of wrinkling, blushing, cracking and the like in the bending process.

Disclosure of utility model

The utility model aims to provide a halogen-free low-smoke flame-retardant B1-level fireproof flexible cable with rated voltage of 0.6/1kV or below.

In order to achieve the above purpose, the technical scheme of the utility model is as follows:

A halogen-free low-smoke flame-retardant B1-level fire-resistant flexible cable consists of a soft copper conductor, a fire-resistant wrapping tape, a double insulating layer, a filling layer, a flame-retardant isolation layer and a sheath layer, wherein the fire-resistant wrapping tape is wrapped on the soft copper conductor, a double insulating layer is evenly extruded on the fire-resistant wrapping tape to form a wire core, the inner layer of the double insulating layer adopts high-insulation ethylene propylene rubber insulating material, the outer layer of the double insulating layer adopts low-smoke halogen-free flame-retardant ethylene propylene rubber, a plurality of wire cores are twisted to form a cable core, a halogen-free low-smoke flame-retardant high-temperature environment-friendly filling rope is filled in clearance filling of the wire core to form the filling layer, the flame-retardant isolation layer is wrapped outside the cable core, and the sheath layer is extruded outside the flame-retardant isolation layer.

The performance of the soft copper conductor accords with the 5 th or 6 th soft copper conductor, the conductor monofilament bare copper wire or the tinned copper wire in GB/T3956-2008.

The fire-resistant wrapping tape is a calcined mica tape, the thickness of the calcined mica tape is 0.12-0.20 mm, the wrapping mode is double-layer overlapping wrapping, and the overlapping rate is more than or equal to 25%.

The inner layer of the double insulating layer is made of high-resistance ethylene propylene rubber insulating material with volume resistivity more than or equal to 5 multiplied by 10 ¹³ omega-m.

The double-insulating-layer structure not only ensures insulativity, but also can achieve a halogen-free flame-retardant effect, the thickness of the inner layer of the double insulating layer is controlled to be 0.3-1.0 mm, and the thickness ratio of the inner layer to the outer layer is 3:7-5:5.

The filling layer adopts ZR-GPT halogen-free low-smoke flame-retardant filling rope provided by the electric appliance material limited company of Tengzhou cable, and the filling rope accords with ROHS standard, has the functions of halogen free, low smoke and environmental protection, and has the oxygen index of more than or equal to 40 percent.

The flame-retardant isolation belt is a double-layer glass fiber belt, and the wrapping overlapping rate is not less than 25%.

The sheath layer adopts a rubber elastomer material with low smoke zero halogen flame retardant B1 grade ethylene-vinyl acetate rubber as a base material, and the rubber elastomer material has the characteristics of zero halogen, low smoke, wear resistance, oil resistance and the like.

After the scheme is adopted, the halogen-free low-smoke flame-retardant B1-level fireproof flexible cable for connecting electrical equipment with high insulation resistance, softness, wear resistance and oil resistance, rated voltage of 0.6/1kV or below, wherein the flame retardant grade reaches the B1-level requirement in GB31247, the combustion drop/particle grade reaches the d 1-level, the smoke toxicity reaches the T0-level, the corrosiveness reaches the a 1-level, the fireproof performance meets the GB/T19666 requirement, and the halogen-free low-smoke flame-retardant B1-level fireproof flexible cable is suitable for personnel-intensive occasions such as hospitals, subways and stations.

Drawings

Fig. 1 is a schematic structural view of the present utility model.

The reference numerals in the figures illustrate:

Soft copper conductor 1, fire-resistant band 2, double insulation layers (inner layer 3 and outer layer 4), filling layer 5, fire-retardant isolation layer 6, restrictive coating 7.

Detailed Description

The utility model will be further described with reference to the drawings and examples.

As shown in fig. 1, the embodiment of the utility model discloses a halogen-free low-smoke flame-retardant B1-level fireproof flexible cable which consists of a soft copper conductor 1, a fireproof wrapping tape 2, double insulating layers (an inner layer 3 and an outer layer 4), a filling layer 5, a flame-retardant isolation layer 6 and a sheath layer 7.

The soft copper conductor 1 has the performance which accords with the 5 th or 6 th soft copper conductor, the conductor monofilament bare copper wire or the tinned copper wire in GB/T3956-2008.

The soft copper conductor 1 is wrapped with the fire-resistant wrapping tape 2, specifically, the fire-resistant wrapping tape 2 can be a calcined mica tape, the thickness of the calcined mica tape is 0.12-0.20 mm, the thickness of the calcined mica tape is 0.14mm, the wrapping mode is double-layer overlapping wrapping, and the overlapping rate is more than or equal to 25%.

The fire-resistant wrapping tape 2 is uniformly extruded with double insulating layers (an inner layer 3 and an outer layer 4) to form a wire core. The inner layer 3 of the double insulating layer is made of ethylene propylene rubber insulating material with high insulation, the volume resistivity is as high as or higher than 5 multiplied by 10 ¹³ omega-m (high resistance), the outer layer 4 of the double insulating layer is made of low smoke halogen-free flame retardant ethylene propylene rubber, the thickness of the inner layer 3 of the double insulating layer is controlled to be 0.3-1.0 mm, and the thickness ratio of the inner layer 3 to the outer layer 4 is 3:7-5:5. The insulating layer adopts a double insulating structure, so that the insulativity is ensured, and the halogen-free flame retardant effect can be achieved.

And a plurality of wire cores (4 insulating wire cores in the embodiment) are stranded to form the cable core. The gaps among the wire cores are filled with high-temperature environment-friendly halogen-free low-smoke flame-retardant filling ropes to form a filling layer 5. Specifically, the cable core filling rope adopts ZR-GPT halogen-free low-smoke flame-retardant filling rope provided by the electric appliance material limited company of Tengzhou cable, and the filling rope meets ROHS standard, has the functions of halogen free, low smoke and environmental protection, and has an oxygen index of more than or equal to 40 percent.

And the cable core is externally overlapped with the wrapping flame-retardant isolation belt in a double-layer manner to form a flame-retardant isolation layer 6. Specifically, the flame-retardant isolation belt is a double-layer glass fiber belt, and the wrapping overlapping rate is not less than 25%.

And the flame-retardant isolation layer 6 is externally extruded with a sheath layer 7. Specifically, the sheath layer 7 adopts a rubber elastomer material with low smoke zero halogen flame retardant B1 grade ethylene-vinyl acetate rubber as a base material, and the rubber elastomer material has the characteristics of zero halogen, low smoke, wear resistance, oil resistance and the like.

The utility model adopts the double-layer ethylene-propylene insulating inner layer 3 and the outer layer 4, can effectively improve the insulating performance, ensures the use safety of the cable, ensures that the glass fiber tape wrapped flame-retardant isolating layer 6 plays a role in isolating dripping substances during combustion, passes the test, has the advantages of good environmental protection performance, no toxicity and low smoke, is soft, convenient to lay, greatly reduces the difficulty in installation, has the combustion grade reaching the B1 grade requirement in GB31247, has the combustion dripping substance/particle grade reaching the d1 grade, has the smoke toxicity reaching the T0 grade and has the corrosiveness reaching the a1 grade, has the fireproof performance meeting the GB/T19666 requirement, and is suitable for personnel intensive occasions such as hospitals, subways, stations and the like.

Furthermore, it should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is provided for clarity only, and that the disclosure is not limited to the embodiments described in detail below, and that the embodiments described in the examples may be combined as appropriate to form other embodiments that will be apparent to those skilled in the art.

Claims

1. A halogen-free low-smoke flame-retardant B1-level fire-resistant flexible cable is characterized by comprising a soft copper conductor, a fire-resistant wrapping tape, a double insulating layer, a filling layer, a flame-retardant isolation layer and a sheath layer, wherein the soft copper conductor is wrapped with the fire-resistant wrapping tape, the double insulating layer is evenly wrapped with the double insulating layer in an extrusion mode, the inner layer of the double insulating layer is made of ethylene propylene rubber insulating material, the outer layer of the double insulating layer is made of low-smoke halogen-free flame-retardant ethylene propylene rubber, a plurality of wire cores are twisted to form a cable core, gaps of the wire cores are filled with halogen-free low-smoke flame-retardant filling ropes to form the filling layer, the cable core is wrapped with the flame-retardant isolation layer to form the flame-retardant isolation layer, and the sheath layer is wrapped outside the flame-retardant isolation layer in an extrusion mode.

2. The halogen-free low-smoke flame-retardant B1-level fireproof flexible cable as claimed in claim 1, wherein the soft copper conductor has the performance which accords with the 5 th or 6 th soft copper conductor, the conductor monofilament bare copper wire or the tinned copper wire in GB/T3956-2008.

3. The halogen-free low-smoke flame-retardant B1-level fireproof flexible cable according to claim 1, wherein the fireproof wrapping tape is a calcined mica tape, the thickness of the calcined mica tape is 0.12-0.20 mm, the wrapping mode is double-layer overlapping wrapping, and the overlapping rate is more than or equal to 25%.

4. The halogen-free low-smoke flame-retardant B1-level fireproof flexible cable according to claim 1, wherein the inner layer of the double insulating layer is made of high-resistance ethylene propylene rubber insulating material with volume resistivity of more than or equal to 5 multiplied by 10 ¹³ ohm-m.

5. The halogen-free low-smoke flame-retardant B1-level fireproof flexible cable according to claim 1, wherein the thickness of the inner layer of the double insulating layers is controlled to be 0.3-1.0 mm, and the thickness ratio of the inner layer to the outer layer is 3:7-5:5.

6. The halogen-free low-smoke flame-retardant B1-level fireproof flexible cable according to claim 1, wherein the filling layer is ZR-GPT type halogen-free low-smoke flame-retardant filling rope provided by Tengfei cable electrical materials limited company in Yangzhou, and the filling rope meets ROHS standard, and the oxygen index is more than or equal to 40%.

7. The halogen-free low-smoke flame-retardant B1-level fireproof flexible cable according to claim 1, wherein the flame-retardant isolation belt is a double-layer glass fiber belt, and the wrapping overlapping rate is not less than 25%.

8. The halogen-free low-smoke flame-retardant B1-level fire-resistant flexible cable of claim 1, wherein the sheath layer is made of rubber elastomer material with low-smoke halogen-free flame-retardant B1-level ethylene-vinyl acetate rubber as a base material.