WO2019114208A1 - Low-smoke zero-halogen fire-resistant flexible power cable - Google Patents

Abstract

A low-smoke zero-halogen fire-resistant flexible power cable comprises, from an outer side to an inner side, a sheath layer (1), an insulation layer (2), a mica tape layer (3), and a conductive member (4). The material of the sheath layer (1) is an environmentally-friendly low-smoke zero-halogen polyolefin material having high-temperature resistance to 110℃. The material of the insulation layer (2) is a cross-linked polyethylene insulation material also having high-temperature resistance to 110℃. The mica tape layer (3) is fabricated by winding two overlapping layers of a calcined phlogopite mica tape. The conductive member (4) is fabricated by twisting multiple annealed bare copper wires. The power cable is fire-resistant up to 1050℃, extremely close to the melting point of copper. The power cable is capable of effective operation even in a major fire having a temperature higher than 950℃ and lower than the melting point of copper, thereby significantly improving safety during use, and ensuring the life safety of people.

Description

Low-smoke halogen-free fire-resistant flexible cable Technical field

The invention relates to a fire-resistant flexible cable, in particular to a low-smoke halogen-free fire-resistant flexible cable which can be widely applied to large-scale densely populated places such as shopping malls and hotels, and has a fire-resistant temperature of up to 1050 °C.

Background technique

With the rapid development of China's economy, modern office buildings, hotels, restaurants, railway stations and other important public places have become more and more luxurious, and more and more combustibles are used. The role of wire and cable is to transmit electricity and signals, to realize alarms, start-up of fire-fighting facilities, rescue, etc. For the above-mentioned densely populated places, if the wires and cables cannot guarantee normal work after the fire, the consequences are unimaginable.

The fire-resistant wire is to ensure that the line is normally energized and transmitted with various control and alarm signals during a certain period of time to ensure the normal lighting, emergency broadcast, fire alarm device, automatic fire-fighting facilities and other emergency equipment in the event of fire. The power supply enables the personnel to evacuate in time, so that the rescue work can be carried out normally. It is obvious that the reliability of the fire-resistant wire is very important. With the gradual attention of the state to fire prevention work, people's awareness of safety has gradually increased. In order to improve the safety level of electrical circuits and reduce the occurrence and loss of electrical fire accidents, the Ministry of Construction, the Ministry of Public Security and some local governments have successively promulgated some electrical design codes, and clearly stipulated that fire-resistant cables should be used in some important electrical circuits or places. The demand for fire-resistant wire and cable products is also increasing year by year in various countries around the world. In order to ensure fire safety issues in important places such as public places, fire-resistant, flame-retardant, low-smoke and halogen-free fire-resistant cables should be promoted.

However, at this stage, the common domestic fire-resistant cables can only reach the highest fire-resisting temperature of 750-850 °C. Even in the BS 6387 European fire-resistant standard, the highest fire-resistant temperature is only 950 °C. In the event of a large fire, the temperature exceeds 950 °C. When this series of cables will lose fire resistance. We all know that the material of the conductor for the cable is generally copper, and the melting point of copper is 1083.4 ° C. Therefore, domestic and foreign related professionals are studying a fire resistant cable with a maximum fire resistance temperature exceeding 950 ° C and lower than the melting point of copper.

Summary of the invention

SUMMARY OF THE INVENTION It is an object of the present invention to provide a low-smoke, halogen-free, fire-resistant flexible cable having a fire resistance temperature of 1050 ° C.

In order to achieve the above technical purpose, the technical solution of the present invention is:

A low-smoke, halogen-free fire-resistant flexible cable comprising a sheath layer, an insulating layer, a mica tape layer and a conductor in order from the outside to the inside.

The sheath layer material is an environment-friendly low-smoke halogen-free polyolefin material with a high temperature resistance up to 110 ° C. The above materials are coated on a cable-cable core of a cable insulated core or a multi-core cable by an extrusion process. Compared with the conventional products on the market, the low-smoke and halogen-free sheathing material is a temperature-resistant 90°C material, and its aging resistance test condition is 100°C, compared with 168h, the environmentally friendly low-smoke halogen-free polyolefin sheathing material used in the product. The high temperature resistance can reach 110 °C, and it can be used in the aging resistance test conditions: 110 ° C, 480 h, matching with its high temperature resistant insulating material.

The material of the insulating layer is a cross-linked polyethylene insulating material with high temperature resistance up to 110 ° C. The material is coated on the virgin mica tape by extrusion coating to ensure the insulation performance of the product. Through testing the material high temperature up to 110 ° C, can pass the aging test conditions: 150 ° C, 168 h, and the insulation materials used in the market such products: 90 ° C temperature grade, aging resistance test conditions of 135 ° C, 168h Compared with the product, the temperature resistance and insulation performance of the product are further improved. The above materials have strong high temperature resistance performance, can meet the 90 °C high temperature pressure test, and ensure that the indentation is less than or equal to 50%. At present, the conventional products can only meet the 80 °C high temperature resistance test. In the actual use of the heating process, such as the weight or a certain pressure, the thickness of the insulation and the sheath can be protected from the serious damage, and the thickness of the insulation and the sheath is ensured, thereby further improving the product. Use security. The insulating layer has a thickness of 0.7 to 2.4 mm.

The mica tape layer is wrapped by a double-layered overlay of calcined phlogopite tape, and the tiling rate of the lap is preferably 50%.

The conductor is formed by stranding a plurality of annealed bare copper wires. Specifically, a bare copper conductor is stranded and annealed by a class 5 or class 6 fine copper wire, and the conductor has a specification of 1.5 mm ² to 630 mm ² .

The cable has a maximum fire resistance of 1050 ° C and a duration of 120 minutes.

The flexible cable has good softness, the minimum bending radius is 5D, and D is the outer diameter of the cable.

The rated working voltage of the cable of the invention is 0.6/1 (1.2) kV, the long-term working temperature of the cable conductor is less than or equal to 110 ° C, the ambient temperature is not lower than 0 ° C when the cable is laid, and the minimum bending radius of the cable can reach 5 times outside the cable. The diameter value, even when the large fire temperature exceeds 950 ° C and is lower than the melting point of copper, the cable can effectively play its role, greatly improving the safety of use and ensuring the safety of personnel. The flexible cable of the present invention greatly increases the temperature of the fire resistance, infinitely close to the melting point of copper. Therefore, the product can be widely used in large-scale populated places such as shopping malls and hotels. In the event of a fire, it can provide sufficient safe power supply time and signal transmission for the line to ensure that the personnel are evacuated within the effective time period. It greatly improves the safety of product use and ensures the safety of personnel.

DRAWINGS

Figure 1 is a schematic view of the structure of the present invention.

Detailed ways

The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

As shown in Figure 1, a low-smoke, halogen-free fire-resistant flexible cable, from the outside to the inside, is:

Jacket layer 1, the material is environmentally friendly low-smoke halogen-free polyolefin material with high temperature resistance up to 110 °C, and 110 °C environmentally friendly low-smoke halogen-free polyolefin with the grade DW9022-C01 of China Guangdong Nuclear Power Delta (Jiangsu) Plastics Co., Ltd. The sheath material is coated on the cabled core of the cable insulated core or multi-core cable by an extrusion process. Compared with the conventional products on the market, the low-smoke and halogen-free sheathing material is a temperature-resistant 90°C material, and its aging resistance test condition is 100°C, compared with 168h, the environmentally friendly low-smoke halogen-free polyolefin sheathing material used in the product. The high temperature resistance can reach 110 °C, and it can be used in the aging resistance test conditions: 110 ° C, 480 h, matching with its high temperature resistant insulating material.

Insulation layer 2, the material is XLPE insulation material with high temperature resistance up to 110 °C. It is made of cross-linked polyethylene insulation material of CAX9100HMB9003B produced by Shanghai Kaipot Cable Compound Factory. The material is coated by extrusion. The refractory layer mica belt ensures the insulation properties of the product. Through testing the material high temperature up to 110 ° C, can pass the aging test conditions: 150 ° C, 168 h, and the insulation materials used in the market such products: 90 ° C temperature grade, aging resistance test conditions of 135 ° C, 168h Compared with the product, the temperature resistance and insulation performance of the product are further improved. The above materials have strong high temperature resistance performance, can meet the 90 °C high temperature pressure test, and ensure that the indentation is less than or equal to 50%. At present, the conventional products can only meet the 80 °C high temperature resistance test. In the actual use of the heating process, such as the weight or a certain pressure, the thickness of the insulation and the sheath can be protected from the serious damage, and the thickness of the insulation and the sheath is ensured, thereby further improving the product. Use security. The insulating layer has a thickness of 0.7 to 2.4 mm.

The mica tape layer 3, the mica tape layer is wrapped by a double-layer overlapping lap of calcined phlogopite, and the tiling rate of the lap is preferably 50%. The calcined phlogopite tape was purchased from Hubei Pingan Electrical Materials Co., Ltd., and the mica tape was CP160G32A with a thickness of 0.14 mm.

Conductor 4, the conductor is formed by stranding a plurality of annealed bare copper wires. Specifically, a bare copper conductor is stranded and annealed by a class 5 or class 6 fine copper wire, and the conductor has a specification of 1.5 mm ² to 630 mm ² .

The nominal value of the thickness of the above-mentioned soft cable extrusion sheath should be calculated according to the following formula:

T=0.035D+1.0

D---The assumed diameter of the cable before the sheath is sheathed, in millimeters (mm) (see Appendix A of IEC 60502-1). The value calculated according to the above formula should be repaired to 0.1 mm (see IEC 60502-1 Appendix B). The nominal thickness of the single-core cable jacket shall be not less than 1.4 mm, and the nominal thickness of the multi-core cable jacket shall be not less than 1.8 mm. The thinnest point t of the sheath is required to be as follows: t ≥ 0.85 T - 0.1 mm.

The cable has a fire resistance temperature of up to 1050 ° C, which is infinitely close to the melting point of copper. Even when the large fire temperature exceeds 950 ° C and is lower than the melting point of copper, the cable can effectively play its role, greatly improving the safety of use. To protect the safety of personnel.

Use characteristics: the rated working voltage of the cable is 0.6/1 (1.2) kV, the long-term working temperature of the cable conductor is less than or equal to 110 °C, the ambient temperature is not lower than 0 °C when the cable is laid, and the minimum bending radius of the cable can reach 5 times the cable. Outer diameter value.

The above embodiments are not intended to limit the invention in any way, and all the technical solutions obtained by means of equivalent replacement or equivalent transformation fall within the protection scope of the present invention.

Claims (6)

1. A low-smoke halogen-free fire-resistant flexible cable comprising a sheath layer, an insulating layer, a mica tape layer and a conductor from the outside to the inside, wherein the sheath layer material is environmentally friendly low-smoke without high temperature up to 110 ° C a halogenated polyolefin material, the material of the insulating layer is a crosslinked polyethylene insulating material with a high temperature resistance up to 110 ° C, and the mica tape layer is wrapped by a double layer of overlapping layers of calcined gold mica tape, the conductor is composed of The root is annealed and bare copper wire is stranded.
2. A low-smoke, halogen-free fire-resistant flexible cable according to claim 1, wherein the hood has a tiling rate of 50%.
3. A low-smoke halogen-free fire-resistant flexible cable according to claim 1, wherein the cable has a maximum fire-resistance temperature of 1,050 ° C and a duration of 120 minutes.
4. A low-smoke halogen-free fire-resistant flexible cable according to claim 1, wherein said insulating layer has a thickness of 0.7 to 2.4 mm.
5. A low-smoke halogen-free fire-resistant flexible cable according to claim 1, wherein said conductor has a specification of 1.5 mm ² to 630 mm ² .
6. A low-smoke halogen-free fire-resistant flexible cable according to claim 1, wherein the cable has a minimum bending radius of 5D and D is an outer diameter of the cable.

Images