CN103310893A - High-performance cable for construction - Google Patents

Abstract

The invention discloses a high-performance building cable. It solves the problems of low flame retardancy, poor weather resistance, and short service life of current construction cables, and has the advantages of environmental protection, flame retardancy, waterproof, moisture-proof, strong anti-interference ability, superior electrical performance, and long service life. Its structure is: it includes a cable core, the cable core is composed of a number of insulated wire cores arranged in the filling body, each insulated wire core includes a conductor and a double-layer co-extruded heterogeneous insulating layer extruded outside the conductor, the cable The outside of the core is coated with a tape layer, a cable shielding layer, an oxygen barrier layer, an armor layer, and a cable outer sheath in sequence from the inside to the outside.

Description

High Performance Construction Cables

technical field

The present invention relates to a cable, in particular to a high-performance building cable with a service life of 76.2 years at 85°C deduced according to the test method specified in IEC60216-1:2001 and the Arrhenius model.

Background technique

At present, most cables used in construction are single-layer insulation, using polyvinyl chloride or cross-linked polyethylene insulation, which has poor electrical stability, poor anti-interference ability, flammable (easy to spontaneous combustion), easy to age, easy to wear and scratch, and is afraid of moisture. When burning, it produces dense smoke and is highly toxic, which poses safety hazards, especially the short service life, which cannot reach the same lifespan as the building, and the replacement cost of the secondary wiring is high, and it leaves a safety hazard to the building, making the building in its thirties And die young.

Chinese patent CN202720937U discloses a hanging type installation cable for high-rise buildings, including a cable core, a filling layer is provided in the gap in the cable core, and an inner liner, an armor layer, and an outer sheath are sequentially extruded outside the cable core ; Mainly, three steel wire ropes are arranged in the cable core. The cable core is formed by twisting several insulated wire cores and three steel wire ropes; the insulated wire core is composed of a conductor and insulation extruded outside the conductor. However, the cable disclosed in this patent is single-layer insulation, without shielding layer, poor electrical stability, poor aging resistance and weather resistance, poor water resistance and moisture resistance, especially short service life, generally 20-40 years, It cannot reach the same lifespan as the building.

Chinese patent CN201667252U discloses a medium-voltage flame-retardant and fire-resistant environment-friendly armored power cable, which includes one or more cable cores and a tape (7) covering all the cable cores. Wrapped conductor (1), conductor shielding (2), conductor insulation (3), insulation shielding (4) and metal shielding (5); all cable cores are wrapped with semi-conductive resistance water-wrapped tape (7), The gap between the cable core and the tape (7) is filled with a filler material (6); a water-blocking layer (8) is wrapped around the tape (7), and an oxygen barrier layer is wrapped around the water-blocking layer (8) (9), the oxygen barrier layer (9) is coated with an inner lining layer (10), an anti-corrosion steel strip (11) and a sheath (12) in sequence. However, the cable conductor disclosed in this patent does not adopt double-layer co-extrusion insulation of heterogeneous materials, and has poor anti-aging performance and short service life. It is necessary to replace the circuit about 3 times in a building with a service life of 70 years, which costs a lot of manpower and material resources. .

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art and provide a high-performance cable for construction, which has environmental protection, flame retardancy, aging resistance, strong anti-interference ability, stable structure, moisture-proof, water-blocking, and electrical Superior, especially long service life.

To achieve the above object, the present invention adopts the following scheme:

A high-performance building cable, which includes a cable core, the cable core is composed of a number of insulated cores arranged in a filler body, each insulated core includes a conductor and a double-layer co-extruded heterogeneous insulating layer extruded outside the conductor, The outside of the cable core is sequentially coated with a tape layer, a cable shielding layer, an oxygen barrier layer, an armor layer, and a cable outer sheath from the inside to the outside.

The cable core includes three insulated wire cores twisted together.

The double-layer co-extruded heterogeneous insulating layer is an inner insulating layer and an outer insulating layer; wherein, the inner insulating layer is an irradiation cross-linked polyethylene insulating layer, and the outer insulating layer is an irradiation cross-linked low-smoke halogen-free flame-retardant polyolefin Insulation layer, the thickness ratio of the inner and outer insulation layers is 1:1. It has been proved by experiments that when the thickness ratio of the inner and outer insulation layers is 1:1, the insulation resistance and flame retardant performance of the insulated wire core will achieve the best results; heterogeneous insulation through double-layer Co-extrusion prevents air, dust and other impurities from being mixed in between the insulation, making the electrical properties and anti-aging properties of the product more stable.

The tape layer is a high flame-retardant tape, which makes the flame-retardant performance more reliable.

The shielding layer of the cable is a tie pattern longitudinal wrapping shielding layer, and the shielding layer is an aluminum-plastic composite tape.

The oxygen barrier layer of the cable is a halogen-free flame-retardant elastic filler with an oxygen index of 40, which is extruded on the outside of the cable core.

The armor layer is galvanized steel tape armor.

The outer sheath of the cable is made of halogen-free, low-smoke, flame-retardant, radiation-crosslinked polyolefin.

The invention is a high-performance building cable used in buildings. The inner layer of the outer wall of each insulated core conductor is irradiated cross-linked polyethylene insulating material, which improves the electrical performance of the product and reduces the dielectric loss during use. , so that the transmission signal is more stable and reliable, thereby ensuring the effective transmission of the cable; the outer layer is irradiated cross-linked low-smoke halogen-free polyolefin insulation material, which has excellent electrical properties, high and low temperature resistance, service life, mechanical and physical properties . The cable sheath is made of low-smoke, halogen-free, flame-retardant, irradiation cross-linked polyolefin sheathing material, which has the characteristics of excellent crack resistance, small heat shrinkage, easy processing, low odor, halogen-free, low-smoke, and flame-retardant. What is more, it has high environmental aging resistance and long service life.

The cable tape is a high flame retardant tape, which makes the flame retardant performance more reliable. The cable shielding layer is wrapped vertically with aluminum-plastic composite tape, so that the product has a good shielding effect, and contains the mechanical stress of the plastic tape, making the shielding layer more stable and reliable, while increasing the performance of water resistance and moisture resistance, and enhancing the bending of the product performance, easy laying and installation.

The beneficial effects of the invention are: environmental protection, flame retardancy, strong anti-interference ability, superior electrical performance, good aging resistance and long service life. The materials used in the cables are all low-smoke, halogen-free, flame-retardant and environmentally friendly materials, which ensure the environmental protection of the cables and improve the service life of the cables while being flame-retardant. The insulation adopts double-layer co-extrusion technology and radiation cross-linking technology, and the thickness ratio of inner and outer insulation is 1:1, which makes the cable have more superior electrical properties. The shielding layer is made of tie pattern longitudinal wrapping to make the shielding layer tighter, with strong anti-interference ability, better moisture-proof effect, good bending performance, and easy laying and installation. The outer sheath is made of low-smoke, halogen-free, flame-retardant, radiation-crosslinked polyolefin sheath material, which ensures the flame-retardant and environmental protection performance of the cable, and makes the service life of the cable longer.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Among them, 1. Conductor, 2. Inner insulating layer, 3. Outer insulating layer, 4. Filling, 5. Taping, 6. Shielding layer, 7. Oxygen barrier layer, 8. Armoring layer, 9. Outer sheath.

Detailed ways

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

In Fig. 1, the cable core includes three stranded insulated core conductors arranged in a low-smoke, halogen-free, flame-retardant filling body 4; the outer wall of each insulated core conductor 1 is wrapped in an inner insulating layer 2 and an outer insulating layer 3 in turn, Among them, the inner insulating layer 2 is an irradiation cross-linked polyethylene insulating layer; the outer insulating layer 3 is an irradiation cross-linked low-smoke halogen-free polyolefin insulating layer, and the thickness ratio of the inner and outer insulating layers is 1:1. When the layer thickness ratio is 1:1, the insulation resistance and flame retardant performance of the insulated wire core can reach the best effect; the heterogeneous insulation is extruded through double-layer co-extrusion to avoid the mixing of air, dust and other impurities between the insulations, so that the electrical properties of the product The performance and anti-aging performance are more stable.

The outer wall of the filler 4 wraps the cable tape 5 , the cable shielding layer 6 , the cable oxygen barrier layer 7 , the cable armor layer 8 and the cable outer sheath 9 sequentially from the inside to the outside.

The cable tape layer 5 is a high flame-retardant tape, which makes the flame-retardant performance more reliable. The shielding layer of the cable is the shielding layer 6 of the aluminum-plastic composite tape with a tie pattern longitudinally, which increases the shielding effect of the cable, reduces the bending radius, and is waterproof and moisture-proof. The cable oxygen barrier layer 7 is a low-smoke, halogen-free, flame-retardant elastic filler. The cable armor layer 8 is armored with galvanized steel tape. The outer sheath of the cable is low-smoke, halogen-free, flame-retardant, radiation-crosslinked polyolefin.

Although the specific implementation of the present invention has been described above in conjunction with the accompanying drawings, it does not limit the protection scope of the present invention. Those skilled in the art should understand that on the basis of the technical solution of the present invention, those skilled in the art do not need to pay creative work Various modifications or variations that can be made are still within the protection scope of the present invention.

Claims (8)

1. high-performance building cable, it is characterized in that, it comprises cable core, cable core is comprised of some insulated wire cores that are arranged in the obturator, each insulated wire cores comprises the heterogeneous insulating barrier of double-layer coextrusion that conductor is outer with being extruded in conductor, and described cable core is coated with belting layer, cable shield, oxygen barrier layer, armour, cable jacket outward from inside to outside successively.

2. high-performance building cable as claimed in claim 1 is characterized in that, comprises three insulated wire cores that twist together in the described cable core.

3. high-performance building cable as claimed in claim 1 is characterized in that, described tape for cables layer is the high flame retardant band.

4. high-performance building cable as claimed in claim 1 is characterized in that, described cable shield is for pricking the vertical bag of line screen, and vertical bag screen is aluminium-plastic tape.

5. high-performance building cable as claimed in claim 1 is characterized in that, described cable oxygen barrier layer is low-smoke non-halogen flame-retardant elasticity obturator.

6. high-performance building cable as claimed in claim 1 is characterized in that, described cable sheath is the galvanized steel strip armouring.

7. high-performance building cable as claimed in claim 1 is characterized in that, described cable jacket adopts low-smoke non-halogen flame-retardant cross-linking radiation polyolefin to be prepared from.

8. high-performance building cable as claimed in claim 1 is characterized in that, the heterogeneous insulating barrier of described double-layer coextrusion is inner insulating layer and external insulation layer; Wherein, inner insulating layer is the IXPE insulating barrier, and external insulation layer is the irradiated crosslinking low-smoke and halogen-free flame retardant polyolefin insulating barrier, and inside and outside thickness of insulating layer is than being 1:1.

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