CN101707074B - Copper-core silicon rubber insulation fire-resistant polyolefin jacket zero-halogen low-smoke flame-retardant electrical cable - Google Patents

Abstract

The invention discloses a copper-core silicone rubber insulated fire-resistant polyolefin sheathed halogen-free low-smoke flame-retardant power cable, which comprises at least one conductor (1), an insulating layer (2) and a filling layer from the inside to the outside. (3), cable wrapping (4) and fire-resistant sheath (5); wherein the insulating layer (2) is tightly attached to the outside of each conductor (1) to cover the conductor (1), and cable wrapping (4) Cover the conductor (1) and the insulation layer (2); the gap between the cable wrap (4) and the insulation layer (2) is the filling layer (3); close to the cable wrap (4) Covered with a refractory sheath (5). The beneficial effects of the present invention are: the fire-resistant power cable designed with a halogen-free, low-smoke, flame-retardant and fire-resistant structure has been proved by tests to fully meet the flame-retardant and fire-resistant requirements, and the product process is simple. Compared with the current existing fire-resistant fixed wiring cables, The refractory mica tape and reinforcement layer are omitted, the production process is reduced, and the production efficiency is greatly improved.

Description

Copper core silicone rubber insulated fire-resistant polyolefin sheathed halogen-free low-smoke flame-retardant power cable

technical field

The invention relates to a power cable, in particular to a copper-core silicon rubber insulated fire-resistant polyolefin sheathed halogen-free low-smoke flame-retardant power cable.

Background technique

With the development of society and the advancement of science and technology, many power plants, metallurgical enterprises, and petrochemical enterprises are developing towards large-scale groups. High-rise buildings, public entertainment venues, subways and underground streets are constantly emerging, and their power consumption is increasing day by day. Variety and consumption also increased accordingly. Wires and cables can not only transmit and distribute power and transmit information, but also are the "fuse" that can easily cause fires. Ordinary cables, however, cannot carry electricity while the cable burns in an actual fire. However, in the event of a fire in many important occasions, personnel evacuation, passageway lighting, fire alarm devices, automatic fire-fighting facilities and other emergency equipment all require that the cable can be kept normally energized within a specified time when a fire occurs. Therefore, people have developed fire-resistant cables.

Fire-resistant cable: It refers to the performance that the sample can be burned in the flame under the specified test conditions and can still maintain normal operation for a certain period of time. Its fundamental characteristic is that the power cable can still maintain the normal operation of the line for a period of time under burning conditions. In layman's terms, fire-resistant power cables can maintain normal power supply for a period of time when a fire occurs to maintain lighting and transmit signals, protect personnel from having enough time to evacuate safely, and help to extinguish fires and reduce losses.

At present, the existing fire-resistant power cables at home and abroad are mica tape-wrapped fire-resistant power cables, and its structure from inside to outside is as follows: conductor—wrapped mica tape—reinforcing layer—insulation—cable wrapping, filling— - Sheath; the mica tape plays a fire-resistant role; the insulating material is the same as that of ordinary power cables; the filling and wrapping materials can be ordinary materials or flame-retardant materials according to needs; the sheath material can be flame-retardant polymer according to the fire-resistant grade Vinyl chloride, low smoke, low halogen, halogen free, low toxicity sheath material.

Because the mica tape which plays the role of refractory insulation is made of mica paper and reinforcing electrical alkali-free glass fiber cloth with a suitable adhesive, it is baked and dried and then cut into insulating materials. During the production of wrapping, the mica powder along with The bending and winding of the tape is easy to fall off, which directly affects the fire resistance of the product, and the mica tape is easy to get wet and cause power cable breakdown; the process structure is complicated, and the mica tape and the reinforcement layer must be wrapped on the surface of the power cable conductor. The winding speed is slow and the efficiency is low, which affects the delivery time of the product. In addition, the allowable working temperature of different mica tapes varies greatly, making processing difficult. The above various defects lead to very unstable fire resistance of power cables using mica tape fire resistance.

For example: the publication number is CN101447252A, and the Chinese invention patent published on June 3, 2009 discloses an invention patent titled "new fire-resistant cable". The fire-resistant cable consists of a conductor and a mica tape longitudinally wrapped on the conductor, an extruded insulating layer and an outer sheath. The mica tape is provided with a glass ribbon for fastening the mica tape. An inorganic insulating powder layer is arranged between the conductor and the mica tape. The insulation layer is extruded on the tied mica tape. The invention starts from improving the adhesion between the conductor and the mica tape and avoiding the phenomenon that the conductor is exposed to the end surface of the cable. The inorganic insulating powder is adhered to the mica tape with an organic silicon adhesive, and the powder fills the concave part of the mica tape to make the conductor and the mica tape The contact area of the mica tape is increased, and the adhesion is enhanced. Inorganic insulating powder is also adhered to the base material surface of the mica tape, and the insulating layer is extruded after the mica tape is tied tightly with glass ribbons to improve the contact surface between the mica tape and the insulating layer. However, this patent still fails to completely overcome the defects of power cable breakdown due to moisture, complex process structure, slow wrapping speed, and low efficiency when mica tape is used.

Contents of the invention

The present invention overcomes the deficiencies of the prior art, and provides a copper core silicone rubber insulated fire-resistant polyolefin sheathed halogen-free low-smoke flame-retardant power cable with a new structure. The power cable reduces costs while meeting the flame-retardant and fire-resistant properties. Improve production efficiency and make the fire resistance of power cables more stable.

In order to solve the above-mentioned technical problems, the present invention adopts the following technical solutions:

A copper core silicone rubber insulated fire-resistant polyolefin sheathed halogen-free low-smoke flame-retardant power cable, the cable includes at least one conductor, an insulating layer, a filling layer, a cable wrapping and a fire-resistant sheath from the inside to the outside; Among them, the insulating layer is close to the outside of each conductor to cover the conductor, and the cabled wrapping wraps the conductor and the insulating layer; the gap between the cabled wrapping and the insulating layer is a filling layer; it is close to the outside of the cabled wrapping Covered with a fire resistant sheath.

There are three to five conductors.

The diameters of the three to five conductors are exactly the same.

At least one of the three to five conductors has a smaller diameter, and the other conductors have larger and same diameters.

The conductor is a copper conductor.

The insulating layer is a silicone rubber insulating layer.

The cable wrapping is composed of two layers, one is wrapping with halogen-free tape, and the other is wrapping with aluminum-plastic composite tape; the wrapping of halogen-free tape wraps insulating wire core and filler, The aluminum-plastic composite tape is wrapped on the surface of the halogen-free tape.

The cabled wrapping is composed of two layers, one layer is wrapped with halogen-free tape, and the other layer is wrapped with aluminum tape; The wrapping is wrapped on the surface of the halogen-free tape wrapping.

The filling layer is filled with asbestos filling rope.

The fire-resistant sheath is a halogen-free low-smoke fire-resistant polyolefin sheath.

Compared with the prior art, the beneficial effect of the present invention is that the fire-resistant power cable with the halogen-free, low-smoke, flame-retardant and fire-resistant structure designed by the present invention fully meets the flame-retardant and fire-resistant requirements through tests, and the product process is simple, which is different from the current Compared with some fire-resistant fixed wiring cables, the fire-resistant mica tape and the reinforcing layer are omitted, the production process is reduced, and the production efficiency is greatly improved. While the production process is reduced, the probability of product quality problems is also reduced. At the same time, the flame-retardant and fire-resistant structure reduces the amount of materials used and the cost of materials, and is all halogen-free and low-smoke materials. Through the improvements in these aspects, the product performance and enterprise benefits have been greatly improved.

Description of drawings

Fig. 1 is the structural representation of embodiment 1 and embodiment 2 of the present invention;

Fig. 2 is a schematic structural view of Embodiment 3 and Embodiment 4 of the present invention.

Detailed ways

The present invention will be further elaborated below in conjunction with the accompanying drawings.

Example 1:

As shown in Figure 1, a copper core silicone rubber insulated refractory polyolefin sheathed halogen-free low-smoke flame-retardant power cable, the cable includes a copper conductor 1, an insulating layer 2, a filling layer 3, and a Cable wrapping 4 and refractory sheath 5; wherein there are five conductors 1, and each of them has exactly the same diameter. The insulating layer 2 is tightly attached to the outside of each conductor 1 to cover the conductor 1, and the cable wrapping 4 covers the conductor 1 and the insulating layer 2; the gap between the cable wrapping 4 and the insulating layer 2 is filled Layer 3; close to the cabled wrap 4 and covered with a refractory sheath 5 . The insulating layer 2 is made of silicone rubber insulating material. The short-term temperature resistance of silicone rubber can reach 350°C, and it has excellent insulation properties. After burning, silicone rubber can form a ceramic-like structure and has good insulation properties.

The cable wrapping 4 is composed of two layers, one layer is wrapped with halogen-free tape, and the other layer is wrapped with aluminum-plastic composite tape; The plastic composite tape is wrapped on the surface of the halogen-free tape, and the filling layer 3 is filled with asbestos filling rope. The fire-resistant sheath 5 is a halogen-free low-smoke fire-resistant polyolefin sheath. The fire-resistant sheath 5 can protect the insulating layer of the cable when the cable is in normal operation; in a burning environment, the material of the fire-resistant sheath 5 expands rapidly to form a dense porous carbon layer, which plays the role of flame-retardant and fire-resistant.

Example 2

As shown in Figure 1, a copper core silicone rubber insulated fire-resistant polyolefin sheathed halogen-free low-smoke flame-retardant fire-resistant power cable, the cable includes a copper conductor 1, an insulating layer 2, a filling layer 3, The cabling wraps 4 and the refractory sheath 5; wherein there are five conductors 1, and each of them has exactly the same diameter. The insulating layer 2 is close to the outside of each conductor 1 to cover the conductor 1, and the cable wrapping 4 covers the conductor 4 and the insulating layer 2; the gap between the cable wrapping 4 and the insulating layer 2 is filled Layer 3; close to the cabled wrap 4 and covered with a refractory sheath 5 . The insulating layer 2 is made of silicone rubber insulating material. The short-term temperature resistance of silicone rubber can reach 350°C, and it has excellent insulation properties. After burning, silicone rubber can form a ceramic-like structure and has good insulation properties.

The cable wrapping 4 is composed of two layers, one is wrapped with halogen-free tape, and the other is wrapped with aluminum tape; The wrapping is wrapped on the surface of the halogen-free tape wrapping, and the filling layer 3 is filled with asbestos filling rope. The fire-resistant sheath 5 is a halogen-free low-smoke fire-resistant polyolefin sheath. The fire-resistant sheath 5 can protect the insulating layer of the cable when the cable is in normal operation; in a burning environment, the material of the fire-resistant sheath 5 expands rapidly to form a dense porous carbon layer, which plays the role of flame-retardant and fire-resistant.

Example 3

As shown in Figure 2, a copper core silicone rubber insulated refractory polyolefin sheathed halogen-free low-smoke flame-retardant power cable, the cable includes a copper conductor 1, an insulating layer 2, a filling layer 3, and a Cable wrapping 4 and refractory sheath 5; wherein there are four conductors 1, one of which has a diameter smaller than that of the other three. The insulating layer 2 is close to the outside of each conductor 1 to cover the conductor 1, and the cable wrapping 4 covers the conductor 4 and the insulating layer 2; the gap between the cable wrapping 4 and the insulating layer 2 is filled Layer 3; close to the cabled wrap 4 and covered with a refractory sheath 5 . The insulating layer 2 is made of silicone rubber insulating material. The short-term temperature resistance of silicone rubber can reach 350°C, and it has excellent insulation properties. After burning, silicone rubber can form a ceramic-like structure and has good insulation properties.

The cable wrapping 4 is composed of two layers, one layer is wrapped with halogen-free tape, and the other layer is wrapped with aluminum-plastic composite tape; The composite tape is wrapped on the surface of the halogen-free tape and the filling layer 3 is filled with asbestos filling rope. The fire-resistant sheath 5 is a halogen-free low-smoke fire-resistant polyolefin sheath. The fire-resistant sheath 5 can protect the insulating layer of the cable when the cable is in normal operation; in a burning environment, the material of the fire-resistant sheath 5 expands rapidly to form a dense porous carbon layer, which plays the role of flame-retardant and fire-resistant.

Example 4

As shown in Figure 2, a copper core silicone rubber insulated refractory polyolefin sheathed halogen-free low-smoke flame-retardant power cable, the cable includes a copper conductor 1, an insulating layer 2, a filling layer 3, and a Cable wrapping 4 and refractory sheath 5; wherein there are four conductors 1, one of which has a diameter smaller than that of the other three. The insulating layer 2 is close to the outside of each conductor 1 to cover the conductor 1, and the cable wrapping 4 covers the conductor 4 and the insulating layer 2; the gap between the cable wrapping 4 and the insulating layer 2 is filled Layer 3; close to the cabled wrap 4 and covered with a refractory sheath 5 . The insulating layer 2 is made of silicone rubber insulating material. The short-term temperature resistance of silicone rubber can reach 350°C, and it has excellent insulation properties. After burning, silicone rubber can form a ceramic-like structure and has good insulation properties.

The cable wrapping 4 is composed of two layers, one is wrapped with halogen-free tape, and the other is wrapped with aluminum tape; The wrapping is wrapped on the surface of the halogen-free tape wrapping, and the filling layer 3 is filled with asbestos filling rope. The fire-resistant sheath 5 is a halogen-free low-smoke fire-resistant polyolefin sheath. The fire-resistant sheath 5 can protect the insulating layer of the cable when the cable is in normal operation; in a burning environment, the material of the fire-resistant sheath 5 expands rapidly to form a dense porous carbon layer, which plays the role of flame-retardant and fire-resistant.

The processing flow of above-mentioned four embodiments is as follows:

Conductor 1 is made by wire drawing and stranding, the insulating layer 2 is processed on the silicone rubber extruder, the filling layer 3 and cable wrapping 4 are processed on the cable forming machine at the same time, and finally the refractory sheath is processed on the plastic extruder 5.

The above-mentioned embodiment is an illustration of the present invention, not a limitation of the present invention, and any solution after a simple transformation of the present invention belongs to the protection scope of the present invention.

Claims (2)

1. a copper-core silicon rubber insulation fire-resistant polyolefin jacket zero-halogen low-smoke flame-retardant electrical cable is characterized in that: comprise at least one conductor (1), insulating barrier (2), packed layer (3), stranding wrapped (4) and fire-resistant sheath (5) in this cable from inside to outside respectively; Wherein insulating barrier (2) is close to every conductor (1) outside with conductor (1) coating, and stranding wrapped (4) coats conductor (1) and insulating barrier (2); Gap between stranding wrapped (4) and insulating barrier (2) is packed layer (3); Press close to stranding wrapped (4) and be coated with fire-resistant sheath (5), wherein, described conductor (1) has three to five; The diameter of one of them root is less in described three to five conductors (1); Remaining conductor (1) diameter is bigger and identical, and wherein, described stranding wrapped (4) is made up of two-layer; One deck is that the Halogen band is wrapped, and one deck is that aluminium strip is wrapped; Wrapped insulated wire cores and the filler of coating of said Halogen band, the wrapped wrapped surface of Halogen band that is coated on of said aluminium strip.

2. copper-core silicon rubber insulation fire-resistant polyolefin jacket zero-halogen low-smoke flame-retardant electrical cable according to claim 1 is characterized in that: described aluminium strip is wrapped to be that aluminium-plastic tape is wrapped.

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