CN212161388U - High flame-retardant waterproof special cable for rail transit - Google Patents

Abstract

The utility model discloses a high flame-retardant waterproof special cable for rail transit in the technical field of cables, which comprises a sheath, wherein an armor layer, a waterproof layer, a wear-resistant layer and a conductor protective layer are sequentially arranged in the inner cavity of the sheath from outside to inside, a support strip is inserted in the inner cavity of the conductor protective layer, the cross section of the support strip is triangular, conductors are arranged in cavities formed by the inner cavity of the conductor protective layer and the support strip, each conductor comprises a cable core, a conductor shielding layer, an insulating layer and an oxygen isolating layer are sequentially arranged on the outer wall of the cable core from inside to outside, the cross section of the support strip is triangular, and the cavity formed by the conductor protective layer and the support strip is filled with a flame-retardant filler, so that the conductors can be isolated, one group of the conductors cannot influence other two groups when on fire, the sheath, the conductor, further improving the flame-retardant effect.

Description

High flame retardant waterproof special cable for rail transit

technical field

The utility model relates to the technical field of cables, in particular to a high flame-retardant and waterproof special cable for rail transit.

Background technique

Wire and cable are used to transmit electrical (magnetic) energy, information and wire products to realize electromagnetic energy conversion. In a broad sense, wire and cable are also referred to as cables. In a narrow sense, cables refer to insulated cables, which can be defined as: an aggregate composed of the following parts ; One or more insulated cores, and their respective possible coverings, overall and outer sheaths, and cables may also have additional uninsulated conductors. Wire products used to transmit electrical (magnetic) energy, information and realize electromagnetic energy conversion. At present, wires and cables are widely used in various fields, involving people's daily electricity consumption, industrial production, rail transit and other fields. In this way, cables will be applied to In various complex environments, the requirements for the quality of cables are also high, and the cables are required to have various resistance properties. However, the existing cables have poor flame retardant properties, and the economic losses caused by fire and spontaneous combustion of cables are relatively large. , and the combustion will produce toxic substances and other disadvantages. For this reason, we propose a high flame retardant waterproof special cable for rail transit.

Utility model content

The purpose of this utility model is to provide a high flame-retardant and waterproof special cable for rail transit, so as to solve the problems raised in the above background technology.

In order to achieve the above purpose, the present utility model provides the following technical solutions: a high flame-retardant and waterproof special cable for rail transit, including a sheath, and the inner cavity of the sheath is sequentially provided with an armoring layer, a waterproof layer, and a wear-resistant layer from the outside to the inside. and a conductor protection layer, a support bar is inserted into the inner cavity of the conductor protection layer, the cross section of the support bar is triangular, and the cavity formed by the inner cavity of the conductor protection layer and the support bar is provided with a conductor, and the conductor includes A cable core, the outer wall of the cable core is sequentially provided with a conductor shielding layer, an insulating layer and an oxygen barrier layer from the inside to the outside.

Further, the conductor protection layer ring is provided with grooves in an annular array on the outer wall, the inner cavity of the groove is provided with steel strands, and the outer side of the steel strands is attached to the inner wall of the wear-resistant layer.

Further, the outer wall of the oxygen barrier layer is provided with a spiral rubber layer.

Further, the cavity formed by the conductor protection layer, the support bar and the conductor is filled with flame retardant filler.

Compared with the prior art, the beneficial effect of the present invention is that the cross-section of the support bar is triangular, and the cavity formed by the conductor protection layer and the support bar is filled with flame-retardant fillers, which can isolate the conductors, and one group will not catch fire. It affects the other two groups, while the sheath, conductor protection layer and support strip are all made of low-smoke halogen-free materials. The low-smoke halogen-free materials include polymers and flame retardants, which further improves the effect of flame retardant.

Description of drawings

Fig. 1 is the structural representation of the utility model;

FIG. 2 is a cross-sectional view of the conductor of the utility model.

In the figure: 1. Sheath; 2. Armoured layer; 3. Waterproof layer; 4. Wear-resistant layer; 5. Conductor protection layer; 6. Support bar; 7. Conductor; 71. Cable core; 72. Conductor shield 73, insulating layer; 74, oxygen barrier layer; 75, spiral rubber layer; 8, flame retardant filler; 9, groove; 10, steel strand.

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the implementations. example. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

The utility model provides a technical solution: a high flame-retardant and waterproof special cable for rail transit, please refer to Figure 1-2, comprising a sheath 1, and the inner cavity of the sheath 1 is sequentially provided with an armoring layer 2 and a waterproof layer from the outside to the inside. 3. The wear-resistant layer 4 and the conductor protection layer 5, the waterproof layer 3 is made of organic silicon composite material, the inner cavity of the conductor protection layer 5 is inserted with a support bar 6, and the cross section of the support bar 6 is triangular, which can isolate the conductor 7, wherein A fire in one group will not affect the other two groups. The cavity formed by the inner cavity of the conductor protection layer 5 and the support bar 6 is provided with a conductor 7. The conductor 7 includes a cable core 71, and the outer wall of the cable core 71 is arranged in turn from the inside to the outside. There are conductor shielding layer 72, insulating layer 73, oxygen barrier layer 74, insulating layer 73 is made of EPDM rubber with odorless vulcanizing agent, conductor shielding layer 72 is composed of tinned copper wire bundle and high-density fiber yarn bundle, tinned The copper wire bundles are woven in the right direction, and the high-density fiber yarn bundles are woven in the left direction. The braiding pitch ratio of the tinned copper wire bundles and the high-density fiber yarn bundles is between 1.8 and 5.2. Made of high flame retardant oxygen insulation layer cable material, the preparation steps of intumescent low smoke halogen free high flame retardant oxygen insulation layer cable material: ①, put aluminum hydroxide, magnesium hydroxide, montmorillonite, antioxidant, melamine cyanide Urate and red phosphorus are placed in a high-speed mixer and stirred at a speed of 650-750r/min for 4-6min, and then the coupling agent is added and continued to be stirred at a speed of 650-750r/min for 4-5min; ②, the step ①The obtained material is placed in an internal mixer and mixed with ethylene vinyl acetate copolymer, compatibilizer, silicone masterbatch and carbon black, then extruded by twin-screw, and finally granulated by air cooling; ③, step ② The obtained particles are re-placed in an internal mixer and mixed with epoxy resin, then extruded by twin-screw, and finally air-cooled and granulated to obtain an intumescent low-smoke halogen-free and high-flame-retardant oxygen barrier cable material;

Please refer to FIG. 1, the conductor protection layer 5 is provided with a groove 9 in an annular array on the outer wall, the inner cavity of the groove 9 is provided with a steel strand 10, and the outer side of the steel strand 10 is attached to the inner wall of the wear-resistant layer 4, which can strengthen the conductor The flexural and tensile properties of the protective layer 5;

Please refer to FIG. 2, the outer wall of the oxygen barrier layer 74 is provided with a helical rubber layer 75, and the helical rubber layer 75 is a rubber strip spirally wound on the outer wall of the oxygen barrier layer 74 to improve the flexural and tensile properties of the cable;

Please refer to FIG. 1 , the cavity formed by the conductor protection layer 5, the support bar 6 and the conductor 7 is filled with a flame retardant filler 8, through the flame retardant effect of the cable;

Please refer to FIG. 1, the sheath 1, the conductor protection layer 5 and the support bar 6 are all made of low-smoke halogen-free materials, and the low-smoke halogen-free materials include polymers and flame retardants, which further improves the flame retardant effect. The manufacturing process of 1 is to use a 90mm extrusion unit to extrude the low-smoke halogen-free polyolefin composite thermoplastic elastomer evenly and evenly on the outer wall of the armored layer 2 under the environment of steam pressure of 1.0MPa. The thickness is said to be 1.4mm, and the thickness of the thinnest point cannot be less than 1.12mm. The armor layer 2 is completely wrapped, and its surface is smooth and flat, without holes, cracks, and bad bubbles. The support bar 6 is formed by an extruder and a mold. After forming and cooling, wrap the conductor protective layer 5 on the support bar 6, the flame retardant filler 8 and the outer wall of the conductor 7 through the above steps. .

Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes and modifications can be made to these embodiments without departing from the principles and spirit of the present invention , alternatives and modifications, the scope of the present invention is defined by the appended claims and their equivalents.

Claims (4)

1. A high flame-retardant and waterproof special cable for rail transit, comprising a sheath (1), characterized in that: the inner cavity of the sheath (1) is sequentially provided with an armor layer (2) and a waterproof layer (3) from the outside to the inside ), a wear-resistant layer (4) and a conductor protection layer (5), a support bar (6) is inserted into the inner cavity of the conductor protection layer (5), the cross section of the support bar (6) is triangular, and the conductor protection A conductor (7) is provided in the cavity formed by the inner cavity of the layer (5) and the support bar (6), the conductor (7) includes a cable core (71), and the outer wall of the cable core (71) is from inside to outside A conductor shielding layer (72), an insulating layer (73), and an oxygen insulating layer (74) are arranged in sequence. 2. The high flame-retardant and waterproof special cable for rail transit according to claim 1, wherein the conductor protection layer (5) is provided with grooves (9) in an annular array on the outer wall, and the grooves (9) ) inner cavity is provided with a steel strand (10), and the outer side of the steel strand (10) is attached to the inner wall of the wear-resistant layer (4). 3. The high flame-retardant and waterproof special cable for rail transit according to claim 1, wherein the outer wall of the oxygen barrier layer (74) is provided with a helical rubber layer (75). 4. The high flame-retardant and waterproof special cable for rail transit according to claim 1, characterized in that: the cavity formed by the conductor protection layer (5), the support bar (6) and the conductor (7) is filled with resistance Burn the filler (8).

Images