CN111667944A - A water-blocking and fire-proof special cable - Google Patents

Abstract

The invention discloses a water-blocking fireproof special cable which comprises a plurality of wire cores, wherein each wire core comprises a copper core, a first insulating layer and a second insulating layer, the first insulating layer and the second insulating layer are sequentially coated outside the copper core, the copper core is formed by stranding a plurality of copper conductors with corrugated sections, a ceramic wrapping tape, a first protective layer, a second protective layer, a steel tape armoring layer and a protective sleeve are sequentially arranged outside the stranded wire cores, and a water-blocking rope is filled between each wire core and the ceramic wrapping tape. The cable has the advantages of simple structure and reasonable design, and the arrangement of the double-layer insulating layer and the double-layer protective layer ensures that the cable achieves better water-blocking and fireproof effects, ensures the high conductivity of the cable under the condition of higher stability, and reduces the potential safety hazard of the cable in use.

Description

A water-blocking and fire-proof special cable

technical field

The invention belongs to the technical field of special cables, in particular to a water-blocking and fire-proof special cable.

Background technique

At present, ordinary cables on the market generally have a high temperature resistance of 90 °C and have no water-blocking properties. In a humid or rainy environment, after water soaks into the cable, it will affect the conductor and insulation of the cable. As far as the conductor is concerned, the cable is in a thermally stable state during normal operation, and the conductor temperature is generally above 60 ℃. If there is moisture infiltration, the conductor will be oxidized, which will increase the contact resistance between the single wires in the conductor. Conductor resistance increases the energy loss of the transmission line, and even creates a safety hazard. With the continuous development and progress of the society, some special fields such as aerospace, rail transit, petrochemical industry, etc. have higher and higher requirements for cables, which require cables to have good water resistance while ensuring fire resistance. Therefore, we propose a special cable with good water resistance and good fire resistance.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a water-blocking and fire-proof special cable, which has good fire-proof performance and water-blocking performance, and also has impact resistance and anti-interference ability.

The technical scheme adopted in the present invention is: a water-blocking and fire-proof special cable, comprising several wire cores, the wire cores include a copper core and a first insulating layer and a second insulating layer which are sequentially wrapped around the copper core, so that the The copper core is formed by twisting a plurality of copper conductors with corrugated cross-sections, and the stranded cores are sequentially provided with a ceramic wrapping tape, a first protective layer, a second protective layer, a steel tape armoring layer and a Sheath, a water-blocking rope is also filled between the wire core and the ceramicized tape, and the first protective layer is ceramic armored flexible ceramicized fireproof and refractory mineral oxygen barrier mud, and is coated on the ceramicized by extrusion. The outer wall is wrapped, and the second protective layer is a silicone rubber glass fiber protective and heat-insulating tape, which is wrapped around the first protective layer.

Preferably, water blocking powder is sprayed in the gap of the copper core formed by twisting a plurality of copper conductors.

Preferably, the thickness of the first protective layer is 2 mm, and the thickness of the second protective layer is 0.2 mm.

Preferably, the first insulating layer is a fluoroplastic, and is coated on the outer wall of the copper core by extrusion, and the second insulating layer is a ceramicized halogen-free low-smoke polyolefin flame retardant and fire-resistant insulating material, and is coated by extrusion. Cover the outer wall of the first insulating layer.

Preferably, the steel tape armor layer is a double non-magnetic stainless steel tape, and is wrapped on the outer wall of the second protective layer by wrapping.

Preferably, the sheath is made of ceramicized halogen-free low-smoke polyolefin flame retardant refractory material.

The beneficial effects of the present invention are:

(1) The copper core is formed by twisting corrugated copper conductors, which effectively improves the tightness between the copper conductors and reduces the volume of the copper core. At the same time, the gap between the copper conductors is smaller, reducing the air to copper The oxidation of the conductor ensures the high conductivity of the copper core, and the water blocking powder is added in the twisting gap of the copper core, which effectively improves the water blocking performance of the copper core;

(2) The first insulating layer is made of fluoroplastic. Under the condition of conductors with the same cross-section, the fluoroplastic insulating layer can transmit a larger allowable current, which ensures the high conductivity of the wire core while having excellent insulating properties;

(3) The second insulating layer is made of ceramic halogen-free low-smoke polyolefin flame retardant and refractory insulating material, which has excellent flame retardancy and fire resistance. , water blocking and fire protection effect;

(4) A water-blocking rope is filled between the twisted core and the ceramic tape, which further improves the water-blocking performance of the cable;

(5) By using ceramic armor flexible ceramic fire-resistant refractory mineral oxygen-insulating mud as the first protective layer, which is an inorganic composite mineral oxide oxygen-insulating filling material, the flexibility of the cable can be increased, the bending radius can be reduced, and the production It can prevent the cable from cracking during use, and it will gradually ceramicize after burning, with the advantages of no ignition, no smoke, no harmful gas, fire prevention, fire resistance, etc.;

(6) By adopting the silicone rubber glass fiber protective thermal insulation tape as the second protective layer, it mainly plays the effect of thermal insulation protection and thermal insulation;

(7) The steel tape armor layer is wrapped with double non-magnetic stainless steel tapes, which can enhance the impact resistance and anti-interference performance of the cable;

(8) The sheath is made of ceramicized halogen-free low-smoke polyolefin flame retardant refractory material, which has high mechanical properties, high high and low temperature resistance, and the flexural rupture strength of the armor body after ablation can reach 5-8MPa, and can be Continuous production is infinitely long without seams.

The invention has simple structure and reasonable design, and adopts the arrangement of double-layer insulating layers and double-layer protective layers, so that the cable achieves better water-blocking and fire-proof effects, and at the same time, under the condition of high stability, the high-quality cable is guaranteed. The electrical conductivity reduces the potential safety hazard in the use of the cable.

Description of drawings

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

Fig. 2 is the structural schematic diagram of the wire core of the present invention;

FIG. 3 is a partial enlarged view of the copper core of the present invention.

In the figure: 1, wire core; 2, copper core; 3, first insulating layer; 4, second insulating layer; 5, ceramic tape; 6, first protective layer; 7, second protective layer; 8, Steel tape armor; 9. Sheath; 10. Water blocking rope; 11. Water blocking powder.

Detailed ways

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

Example

As shown in FIG. 1 , FIG. 2 and FIG. 3 , the water-blocking and fire-resistant special cable provided in this embodiment includes several wire cores 1 . An insulating layer 3 and a second insulating layer 4, the copper core 2 is formed by twisting a plurality of copper conductors with corrugated cross-sections, and the water-blocking powder 11 is sprayed in the gap of the twisted copper core 2, and the water-blocking powder 11 can be Use electrostatic spraying equipment to spray and fill the gap between the copper core 2, or apply silicone oil on the surface of the copper conductor before twisting, and then let the copper conductor coated with silicone oil pass through the water-blocking powder 11 box, and let the water-blocking powder 11 adhere. twist again;

The copper core 2 is formed by twisting corrugated copper conductors, which can reduce the twisting gap. Water blocking powder 11 is added to the copper core 2, and a water blocking tape is wrapped around the copper core 2, which effectively improves the performance of the copper core 2. Water blocking performance of copper core 2;

At the same time, a double-layer insulating layer is used for the copper core 2, and the outer wall of the wire core 1 is coated with fluoroplastic by extrusion. The fluoroplastic cable can transmit a larger allowable current; the ceramicized halogen-free low-smoke polyolefin flame retardant and refractory insulating material is extruded and wrapped outside the first insulating layer 3 as the second insulating layer 4, which has excellent resistance Flammability and fire resistance, in the case of horizontal combustion, it can be self-extinguishing without delaying combustion, and there is flame at 350-1600 ℃, no flame, no melting, no dripping, no falling off, and no secondary Fire can burn hard ceramic-like armor. The higher the temperature and the longer the time, the harder the ceramic-like armor is. The residue is ceramic inorganic matter, and the residual amount is more than 80%. The ceramic-like armor can form a honeycomb ceramic. The fine holes can play a good role in fire insulation, heat insulation and water blocking;

The twisted cores 1 are sequentially provided with a ceramizing tape 5, a first protective layer 6, a second protective layer 7, a steel tape armor layer 8 and a sheath 9, and the wire cores 1 and the ceramizing Water blocking ropes 10 are also filled between the straps 5;

The water blocking rope 10 can fill the gap between the wire core 1 and the wrapping tape, thereby reducing the gap after the wire core 1 is twisted, and reducing the air content in the gap. Water resistance, effectively preventing moisture from entering the core 1;

The first protective layer 6 is extruded from ceramic armored flexible ceramic fire-resistant refractory mineral oxygen-insulating mud, and the thickness is controlled at 2mm. Controlled at 0.2mm; the double-layer protection design of ceramic armor flexible ceramic fire-resistant refractory mineral oxygen-insulating mud and silicone rubber glass fiber protective insulation tape, among which ceramic-armor flexible ceramic fire-resistant refractory mineral oxygen-insulating mud, has excellent performance. Porcelain-forming property, it can be quickly sintered into a complete ceramic body at high temperature above 450°C or under flame, and the ceramic body maintains good flexural strength in contact with water, and will not be pulverized. No deformation, no cracking, no dripping, the ceramic body has a microporous structure, and has good fire resistance, oxygen insulation and heat insulation effects, while the silicone rubber glass fiber protective insulation tape mainly plays the role of heat insulation, protection and heat preservation. Therefore, the silicone rubber glass fiber protective thermal insulation tape is used as the outer protective layer, which plays a protective role of heat insulation and heat preservation under normal circumstances. If the second protective layer 7 is damaged during combustion, the first protective layer 6 can also pass Ceramic protection is carried out; and the ceramic armor flexible ceramic fireproof refractory mineral oxygen barrier mud is used as the first protective layer 6, which also has good flexibility, which can reduce the bending radius of the cable, and will not crack during processing and use;

The steel tape armoring layer 8 is a double non-magnetic stainless steel tape, and is wrapped around the outer wall of the second protective layer 7, which can enhance the overall impact resistance and anti-interference performance of the cable;

The sheath 9 is made of ceramicized halogen-free low-smoke polyolefin flame retardant refractory material, which has good mechanical properties, and the bending breaking strength of the armor body after ablation can reach about 5-8MPa; it has high and low temperature resistance performance. , At the temperature of -55 ~ 95 ℃, it has the characteristics of ordinary halogen-free low-smoke polyolefin refractory fuel, and the high temperature resistance of the sintered inorganic ceramic armor can reach 2000 ℃; it also has excellent safety and environmental protection. , No delay of burning, no dripping, smoke toxicity reaches ZA1 level, will not cause secondary damage to human body, smoke density light transmittance can reach more than 80%; at the same time, its bending radius is smaller than aluminum alloy sheath 9, easy to lay, Continuous production can be infinitely long without seams.

The above are only the preferred embodiments of the present invention, but the protection scope of the present invention is not limited to this. Any modification and replacement based on the technical solutions and inventive concepts provided by the present invention should be covered by the protection scope of the present invention. Inside.

Claims (6)

1. The utility model provides a fire prevention special type cable blocks water which characterized in that: comprises a plurality of wire cores (1), wherein each wire core (1) comprises a copper core (2), a first insulating layer (3) and a second insulating layer (4) which are sequentially coated outside the copper core (2), the copper core (2) is formed by twisting a plurality of copper conductors with corrugated sections, a ceramic wrapping tape (5), a first protective layer (6), a second protective layer (7), a steel strip armor layer (8) and a sheath (9) are sequentially arranged outside the twisted plurality of wire cores (1), a water-blocking rope (10) is filled between the wire core (1) and the ceramic wrapping belt (5), the first protective layer (6) is ceramic-armored flexible ceramic fireproof refractory mineral oxygen-insulating mud, the second protective layer (7) is a silicon rubber glass fiber protective heat insulation tape and is wound outside the first protective layer (6) by wrapping.

2. A water-blocking fire-proof special cable as claimed in claim 1, wherein: water-blocking powder (11) is sprayed in gaps of a copper core (2) formed by twisting a plurality of copper conductors.

3. A water-blocking fire-proof special cable as claimed in claim 1 or 2, wherein: the thickness of the first protective layer (6) is 2mm, and the thickness of the second protective layer (7) is 0.2 mm.

4. A water-blocking fire-proof special cable as claimed in claim 1, wherein: the first insulating layer (3) is fluoroplastic, and is wrapped on the outer wall of the copper core (2) through extrusion, and the second insulating layer (4) is a ceramic halogen-free low-smoke polyolefin flame-retardant fire-resistant insulating material and is wrapped on the outer wall of the first insulating layer (3) through extrusion.

5. A water-blocking fire-proof special cable as claimed in claim 1, wherein: the steel belt armor layer (8) is a double non-magnetic stainless steel belt and is wrapped on the outer wall of the second protective layer (7) through wrapping.

6. A water-blocking fire-proof special cable as claimed in claim 1, wherein: the sheath (9) is made of ceramic halogen-free low-smoke polyolefin flame-retardant refractory material.

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