CN206432051U - A kind of fireproof cable with split-phase alibate - Google Patents

Abstract

The utility model provides a fireproof cable with a phase-separated aluminum sheath, which includes a twisted multi-strand wire core, the wire core includes an oxygen-free copper conductor, and the oxygen-free copper conductor is wrapped sequentially from the inside Covered with refractory mica layer, aluminum metal sheath and cross-linked polyethylene insulation isolation layer; outside the stranded multi-strand core, from the inside to the outside, it is covered with a high flame-retardant glass cloth tape layer and an anti-cracking layer. low-smoke, halogen-free, and flame-retardant polyolefin sheath layer; the gap between the wire core and the wire core and the high-flame-retardant glass fiber wrapping layer is filled with low-smoke, halogen-free minerals. The fireproof cable with phase-separated aluminum sheath of the utility model has simple, reasonable, compact structure, strong practicability, low cost, and strong ability to prevent rats and ants from biting. It is an environmentally friendly cable with superior performance. Fireproof cables.

Description

A fireproof cable with phase-separated aluminum sheath

technical field

The utility model relates to the cable technology, in particular to a fireproof cable with a phase-separated aluminum sheath.

Background technique

In recent years, modern office buildings, hotels, restaurants, railway stations and other important public places have become more and more luxuriously decorated, and more and more combustibles are used. These important public places require that once a fire occurs, the fire-resistant cables used can normally and continuously transmit power, transmit various control signals and alarm signals to provide valuable resources for people's escape, automatic alarm, start-up of fire-fighting facilities, rescue and use of emergency equipment. time. Under the premise of satisfying the excellent fire resistance of the cable, whether the cable has the ability to prevent the flame from spreading, whether the combustion product is harmful to the human body, and whether it is accompanied by dense smoke are all important indicators for evaluating fireproof cables.

At the same time, under the influence of the cable laying environment, the cable should be able to withstand a certain amount of external force, prevent rodents and ants from eating, and have strong adaptability. It has also become the mainstream trend of high-grade products required by the market today.

Utility model content

The purpose of this utility model is to propose a fireproof cable with a phase-separated aluminum sheath in response to the increasing requirements of cable performance and in combination with market needs. The new fireproof cable has high fire resistance, high flame retardancy, and low smoke. Halogen-free, environmentally friendly, and rodent-proof. The new fireproof cable has a simple structure, superior cable electrical properties, good aging resistance, and is environmentally friendly. It is a stable and excellent fireproof cable.

In order to achieve the above purpose, the technical solution adopted by the utility model is: a fireproof cable with a phase-separated aluminum sheath, which includes a stranded multi-strand wire core, the wire core includes an oxygen-free copper conductor, and the oxygen-free Copper conductors are coated with refractory mica layer, aluminum metal sheath and cross-linked polyethylene insulating layer from inside to outside; Flame-retardant glass fiber cloth tape layer and crack-resistant low-smoke halogen-free flame-retardant polyolefin sheath layer; the gap between the wire core and the gap between the wire core and the high flame-retardant glass fiber wrapping layer is filled with low-smoke halogen-free minerals.

Further, the oxygen-free copper conductor is a solid conductor and/or a stranded Type 2 conductor.

Further, the copper material of the oxygen-free copper conductor is red copper with a purity greater than 99.98%.

Further, when the oxygen-free copper conductor is a type 2 conductor, the conductor structure is a shaped wire twisted with corrugated monofilaments. In order to ensure that the cable is round and the mineral filling is uniform and beautiful, the wire core is usually round Shaped structure, using corrugated monofilament twisted type 2 compact circular conductor, its compactness is higher than conventional round wire twisted type 2 conductor, which can effectively ensure that the conductor cable core meets the corresponding resistance of the national standard Under the premise of the value requirements, the outer diameter of the cable core is reduced to the greatest extent, thereby reducing the amount of outer synthetic mica tape, aluminum metal sheath, mineral filling, low-smoke and zero-halogen sheath, and ultimately reducing cable costs and reducing The purpose of small cable outer diameter.

Further, the refractory mica layer is a synthetic mica tape wrapping layer, and further, the refractory mica layer is a double-sided synthetic mica tape wrapping layer, and its temperature resistance level is greater than 1000 ° C. The double-sided synthetic mica tape is It is the most ideal refractory material for refractory wires. At the same time, the material has the characteristics of strong insulation effect, high temperature resistance level, small expansion coefficient, high dielectric strength and high resistivity.

Further, the aluminum metal sheath is seamlessly welded by argon arc welding. The process is to use aluminum strips to be precisely cut, and formed by a trumpet mold. The joints are continuously and seamlessly welded by argon arc welding. During the process, the conductive wire core wrapped with mica tape is continuously penetrated into the aluminum tube, and the rear of the aluminum tube is drawn through the drawing process, so that the seamless aluminum tube is tightly wrapped on the outside of the mica insulating layer of each conductive wire core.

Further, the cross-linked polyethylene insulation isolation layer is not only the second insulation layer of the cable core, but also acts as a moisture barrier, which can effectively prevent the aluminum metal sheath of the wire core and the moisture in the mineral filling. Contact effectively guarantees the life and safety of the aluminum sheath.

Further, the low-smoke and halogen-free mineral filling is inorganic mineral filling. The low-smoke and halogen-free mineral filling is an inorganic mineral mainly composed of AL(OH) ₃ . Including but not limited to: several inorganic flame retardants with AL(OH) ₃ as the main material are mixed and stirred with adhesives to make cement-like materials, and then cold-extruded by twin-screw extruders. The pressure mold evenly coats the gaps between the wire cores and the surroundings of the cable cores. After the coating is completed, the flame-retardant non-alkali glass cloth tape is wrapped with a wrapping machine directly, and the wrapping is tightly wrapped. The coated low-smoke and halogen-free filling It has strong heat insulation and fire resistance functions, and it will not burn at all after being burned by the flame. It can provide a strong guarantee for the high fire resistance and high flame retardancy of the cable. At the same time, the coated material can withstand the bites of small rodents. For the cable as a whole, it has added excellent anti-rodent and ant performance.

Further, when the cross-section of the phase line in the multi-strand wire core is greater than 6 mm ² , a solid low-smoke and halogen-free cylinder is arranged at the stranding center of the multi-strand wire core. The outer diameter is determined by CAD drawing, and it is optimal to fill the center to make the cable round.

The utility model adopts an anti-cracking low-smoke, halogen-free, and flame-retardant polyolefin sheath layer. While protecting the internal structure of the cable from damage, the material itself is low-smoke, halogen-free, green and environmentally friendly, and has a high oxygen index, which can effectively organize The flame spreads along the axial direction of the cable, which provides a strong guarantee for the flame retardant performance of the cable.

The utility model of the utility model is a fire-resistant cable with a phase-separated aluminum sheath, which has a simple, reasonable and compact structure. Compared with the prior art, it has the following advantages:

(1) The technology is advanced, the outer diameter of the conductor is small, and the manufacturing cost is low. The type 2 conductor made of twisted corrugated monofilaments has a higher compaction than the type 2 conductor made of conventional circular monofilaments. Under the condition that the conductor resistance requirements are also met, the outer diameter of the twisted corrugated single wire is smaller, and the benefits are the reduction of the outer layer of synthetic mica tape, aluminum metal sheath, mineral filling, low smoke and no pollution. Reduce the amount of halogen sheath, and finally achieve the purpose of reducing the cost of the cable and reducing the outer diameter of the cable.

(2) Superior electrical performance, inorganic mineral insulation synthetic refractory mica tape plays a double-layer role, and has a strong insulating effect when the cable is burned without flame; it acts as a refractory layer ( The temperature resistance level is greater than 1000 ℃), to ensure the normal power supply of the cable within a certain period of time.

(3) Good safety. The utility model is a fireproof cable with a phase-separated aluminum sheath, which uses inorganic mineral materials as filling. The flame spreads longitudinally and radially along the cable. At the same time, the extrusion-filled inorganic mineral layer does not melt or drip, is resistant to water spray, and has a very good heat and fire insulation effect, which can ensure power and information in case of fire. The unimpeded control will buy valuable time for personnel escape and fire rescue, and this structure is smokeless and non-toxic when burning, will not produce pollution, has high fire resistance, and can guarantee the safety of cables when burning in a fire at 950 degrees Celsius for 180 minutes. normal power supply. At the same time, a fireproof cable with a phase-separated aluminum sheath, its aluminum sheath structure can be safely grounded through professional accessories, providing stronger and more powerful support for the safety of the cable.

(4) Strong practicability. The utility model is a fireproof cable with a phase-separated aluminum sheath. Due to the presence of a mineral-filled heat insulation layer, the material characteristics are fully utilized, so that the cable forms a relatively excellent anti-rodent and ant-proof layer.

(5) Low-smoke, halogen-free, green and environmentally friendly. The utility model is a fire-resistant cable with a phase-separated metal sheath. Through a reasonable structural design, the product is equipped with high flame retardancy, high fire resistance, and rodent and ant resistance. , fully considering the green environmental protection characteristics under combustion conditions, the materials used are low-smoke and halogen-free materials, and the materials used generally have fire resistance or high oxygen index characteristics, which makes the overall flame retardant and fire resistance of the cable significantly improved, and can easily pass the flame retardant class A In the combustion experiment, the carbonization height is low, and it is an excellent WDZA+ type product.

After testing, the utility model is a heat-insulating and fire-insulating mineral insulated fire-resistant cable, which is green and environmentally friendly. It does not produce harmful halogen gases when burned. The halogen-free performance of the cable has a pH weighted value of ≥ 4.3, a conductivity weighted value of ≤ 10 μS/mm, and low smoke characteristics. The minimum light transmittance is ≥60%, the electrical performance is superior, and the fire resistance can reach 950°C/180min (the current national standard GB/T19666 requires an experimental temperature of 750°C/90min).

To sum up, the cable structure of the utility model is simple, reasonable and compact, and it is an environment-friendly fireproof cable with a wide range of applications.

Description of drawings

Figure 1 is a schematic cross-sectional view of a fireproof cable with a phase-separated aluminum sheath of the present invention.

detailed description

The utility model is further described below in conjunction with embodiment:

Example 1

Figure 1 is a schematic cross-sectional view of a fireproof cable with a phase-separated aluminum sheath of the present invention.

This embodiment discloses a fireproof cable with a phase-separated aluminum sheath of the utility model. Its structure is shown in FIG. The above-mentioned oxygen-free copper conductor 1 is a type 2 conductor formed by twisting. The copper material used is copper with a purity greater than 99.98%. The monofilament used for twisting is corrugated. While ensuring the resistance required by the national standard, it can be Effectively reduce the outer diameter of the cable and reduce the manufacturing cost of the cable. The wire core also includes a double-sided synthetic mica tape 2 , an aluminum metal sheath 3 , and a cross-linked polyethylene insulating layer 4 coated on the outside of the oxygen-free copper conductor.

Among them, the oxygen-free copper conductor 1 is a conductor with excellent electrical performance and high conductivity. The double-sided synthetic mica tape 2 serves as the fireproof insulation layer of the cable as a whole, and the aluminum metal sheath 3 is seamlessly welded by argon arc welding. Wrapped on the outer layer of double-sided synthetic mica tape 2, the cross-linked polyethylene insulating layer 4 acts as a moisture barrier for the aluminum metal sheath 3 of the cable, which can effectively prevent the aluminum metal sheath of the wire core from The moisture contact in the material filling effectively guarantees the life and safety of the aluminum sheath.

The ⁴ wire cores with a cross-sectional area larger than 6mm2 are cabled and twisted at the same time, no filler is added to the edge gap of the wire core, and only a solid low-smoke halogen-free material cylinder 8 is filled in the center of the cable, the purpose of which is to make the While the cabled core is rounded, the center is filled to prevent incomplete filling of the center by the subsequent mineral filling. The outer layer of the cabled core is only wrapped tightly with a tape gap, and the core is stored after the cable is completed. on the transfer cable reel.

The fireproof cable with phase-separated aluminum sheath in this embodiment also includes inorganic mineral filling 5, high flame-retardant glass fiber wrapping layer 6 and crack-resistant low-smoke, halogen-free flame-retardant polyolefin sheath layer 7, inorganic mineral Filler 5 is an inorganic mineral based on AL(OH) ₃ . Specifically, several inorganic mineral non-combustible materials with AL(OH) ₃ as the main ingredient are mixed and stirred with a binder to make a cement-like material, which is cold-extruded by a twin-screw extruder and coated on the intermediate turntable. At the core gap (including the core gap, the gap between the core and the high flame-retardant glass fiber tape layer), it should be noted that the binding tape outside the cable core needs to be coated with inorganic mineral filler 5 before Strip it before the machine head, so that the inorganic mineral filling 5 can be evenly coated on the gap and surface of the cable core. After the coating is completed, the cable core filled with inorganic mineral 5 is wrapped with 2 layers of high flame-retardant glass fiber by the wrapping head. For belt layer 6, the final process is to uniformly extrude a layer of outer sheath with anti-cracking low-smoke halogen-free flame-retardant polyolefin material to protect the inside of the cable from damage and prevent the flame from propagating along the axial direction of the cable in case of fire.

In this embodiment, the fireproof cable with the phase-separated aluminum sheath has a simple structure, the cable has superior electrical performance, good aging resistance, and is environmentally friendly, and is a stable and excellent fireproof cable.

Example 2

This embodiment discloses a fireproof cable with a phase-separated aluminum sheath, its structure is basically the same as that of Embodiment 1, the difference is that the fireproof cable with a phase-separated aluminum sheath described in this embodiment, the Oxygen-free copper conductor 1 is a solid copper conductor with a cross-sectional area of less than 6mm ² and contains 7 wire cores. When the 7 wire cores are twisted into a cable, it is 1+6 normal twisting, and there is no low smoke and no smoke at the center. Halogen cylinder.

The utility model is not limited to the fireproof cables with phase-separated aluminum sheaths described in the above embodiments, wherein changes in the structure of the oxygen-free copper conductor and changes in the thickness of each layer are within the scope of protection of the utility model.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present utility model, and are not intended to limit it; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand : It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements to some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions depart from the various embodiments of the present invention Scope of technical solutions.

Claims (7)

1. a kind of fireproof cable with split-phase alibate, it is characterised in that including stranded multiply core, the core includes Outside anaerobic copper conductor, the anaerobic copper conductor, it is poly- that from-inner-to-outer is coated with fireproof mica layer, aluminum metal sheath and crosslinking successively Ethene dielectric isolation layer；Outside the stranded multiply core, from-inner-to-outer be coated with successively high-fire-resistance glass wool cloth belt and Cracking resistant type low-smoke and halogen-free flame retardant polyolefin jacket layer；The core gap, core and high fire-retardance glass fiber band lamellar spacing are filled out Filled with the filling of low smoke and zero halogen mineral matter.

2. a kind of fireproof cable with split-phase alibate according to claim 1, it is characterised in that the anaerobic copper conductor For solid conductor and/or pass through 2 stranded class conductors.

3. a kind of fireproof cable with split-phase alibate according to claim 2, it is characterised in that when the oxygen-free copper is led When body is 2 class conductor, conductor structure is using the stranded molded line of corrugated monofilament.

4. a kind of fireproof cable with split-phase alibate according to claim 2, it is characterised in that the anaerobic copper conductor Copper material for purity be more than 99.98% red copper.

5. a kind of fireproof cable with split-phase alibate according to claim 1, it is characterised in that the fireproof mica layer For two-sided synthetic mica tape lapping layer.

6. a kind of fireproof cable with split-phase alibate according to claim 1, it is characterised in that the low smoke and zero halogen ore deposit Material is filled with inorganic mineral filling.

7. a kind of fireproof cable with split-phase alibate according to claim 1, it is characterised in that in the multiply core Phase line section is more than 6mm²When, the stranded center of the multiply core is provided with the cylinder of a solid low smoke and zero halogen material.