CN210295985U - Medium-voltage fireproof cable for vertical shaft or high-rise building - Google Patents

Abstract

The utility model discloses a medium voltage fireproof cable for shaft or high-rise building, the core includes three sinle silks, and three wire rope are filled in the clearance department of three sinle silks, and each sinle silk includes the conductor, and the outside of conductor is wrapped in proper order around having conductor shield, insulating layer, insulation shield and copper strips shielding layer; the outer protective layer comprises a heat insulation belting layer, a heat insulation fireproof layer, a steel wire armor layer, a fireproof layer and an outer protective layer from inside to outside in sequence. When the cable is used, the wire core and the steel wire rope are matched with each other to form a stable structure, so that the bearing of the whole cable is increased, the inner bearing and the outer bearing of the cable are stable in a vertical state, and the normal operation of the cable is ensured.

Description

Medium-voltage fireproof cable for vertical shaft or high-rise building

Technical Field

The utility model mainly relates to the technical field of fireproof cables, in particular to a middling pressure fireproof cable for shaft or high-rise building.

Background

With the high-speed development of economy in China, important engineering facilities such as high-rise buildings, mine exploitation and the like are more and more, a medium-voltage power supply system is adopted due to the requirement of loads on electric power, the requirement is provided for the safety performance of a medium-voltage cable under the condition of fire, the cable is required to be capable of still maintaining normal power supply for a period of time under the condition of flame, so that escape and rescue are facilitated, and the medium-voltage fire-resistant cable is produced at the same time. Meanwhile, medium voltage cables are generally single heavy, and requirements are put forward for cable bearing when the cables are vertically laid.

Disclosure of Invention

The utility model provides a to above-mentioned problem, a middling pressure fireproof cable for shaft or high-rise building is provided, through reinforceing core structure and outer jacket for the bearing capacity of cable strengthens greatly, and fire prevention fire behavior is good simultaneously.

The purpose of the utility model can be realized by the following technical scheme: a medium-voltage fireproof cable for a vertical shaft or a high-rise building comprises a core body and an outer protective layer arranged outside the core body, and is characterized in that the core body comprises three wire cores, three steel wire ropes are filled in gaps among the three wire cores, each wire core comprises a conductor, a conductor shielding layer, an insulating shielding layer and a copper strip shielding layer are sequentially wound outside the conductor, and inorganic glass fiber ropes are filled among the three wire cores, the three steel wire ropes and the outer protective layer; the outer protective layer comprises a heat insulation belting layer, a heat insulation fireproof layer, a steel wire armor layer, a fireproof layer and an outer protective layer from inside to outside in sequence.

Preferably, the three wire cores are in a triangular layout, the three steel wire ropes are also in a triangular layout and are arranged corresponding to the three wire cores, each steel wire rope is embedded in a gap between the two wire cores, the steel wire rope with the diameter of 4-6mm is adopted, and the steel wire rope is externally extruded with a steel wire rope sheath, so that the steel wire rope is in a circular or triangular shape, and the center distance of each steel wire rope is larger than that of each wire core.

Furthermore, the steel wire armor layer is formed by tightly arranging steel wires on the periphery of the cable core, the gap between the steel wires is minimum, the total gap between the steel wires is not more than the outer diameter of one steel wire, the steel wires adopt galvanized steel wires, and the diameter of each single wire of the steel wires is 2-3.5 mm.

Compared with the prior art, the technical scheme of the utility model except whole technical scheme's improvement, still include the improvement in the aspect of many details, particularly, have following beneficial effect:

1. according to the improved scheme of the utility model, the cable comprises three wire cores, three steel wire ropes are filled in the gaps of the three wire cores, the wire cores and the steel wire ropes are mutually matched to form a stable structure, the bearing of the whole cable is increased, the inner bearing and the outer bearing of the cable are stable in a vertical state, and the normal operation of the cable is ensured;

2. in the technical scheme of the utility model, each wire core comprises a conductor, and a conductor shielding layer, an insulating shielding layer and a copper strip shielding layer are sequentially wound outside the conductor; the outer protective layer is sequentially provided with a heat insulation belting layer, a steel wire armor layer, a fireproof layer and an outer protective layer from inside to outside, and the cable is provided with a fuse in a double-fireproof structure, wherein the flame temperature of the cable is not lower than 750 ℃ under the rated working voltage, and the fuse is not broken within 90min of the fire supply time;

3. the cable has reasonable cable core layout, meets the fire-resistant requirement of the cable, considers the material selection, the structure size and the electrical performance, and simultaneously achieves the purpose of reducing the cost;

4. the utility model discloses a cable has good heat-proof quality, and is friendly to the environment simultaneously, nontoxic pollution-free.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

The labels in the figure are as follows:

the cable comprises a conductor 1, a conductor shielding layer 2, an insulating layer 3, an insulating shielding layer 4, a copper strip shielding layer 5, a steel wire rope 6, a steel wire rope sheath 7, an inorganic glass fiber rope 8, a heat insulation belting layer 9, a heat insulation fireproof layer 10, a steel wire armor layer 11, a fireproof layer 12 and an outer sheath 13.

Detailed Description

The following detailed description of the embodiments of the present invention will be given with reference to the accompanying drawings to make it clear to those skilled in the art how to practice the invention. While the invention has been described in connection with its preferred embodiments, these embodiments are intended to be illustrative, and not to limit the scope of the invention.

As shown in fig. 1, a medium voltage fireproof cable for a vertical shaft or a high-rise building comprises a core and an outer protective layer arranged outside the core, and is different from the prior art in that the core comprises three wire cores, three steel wire ropes are filled in gaps between the three wire cores, each wire core comprises a conductor 1, and a conductor shielding layer 2, an insulating layer 3, an insulating shielding layer 4 and a copper strip shielding layer 5 are sequentially wound outside the conductor; the outer protective layer comprises a heat insulation belting layer 9, a heat insulation fireproof layer 10, a steel wire armor layer 11, a fireproof layer 12 and an outer protective layer 13 from inside to outside in sequence.

Particularly, three sinle silks are the triangle-shaped overall arrangement, and three wire rope 6 also are the triangle-shaped overall arrangement and three sinle silks and correspond the setting, and every wire rope inlays and locates in the clearance between two sinle silks, fills inorganic glass fiber rope 8 between three sinle silks, three wire rope and outer jacket. Because of the design of the double-bearing structure, three steel wire ropes in the cable core bear the weight, and the steel wires outside the cable core are armored to bear the weight, so that the inner and outer bearings of the cable are stable in a vertical state, and the normal operation of the cable is ensured.

In one embodiment, three wire ropes are filled in the gaps of the three wire cores, the three wire cores are in a triangular layout, the three wire ropes are also in a triangular layout and are correspondingly arranged with the three wire cores, the corresponding arrangement refers to that the three wire cores are arranged in a regular triangle, the three wire ropes are arranged in an inverted triangle, the three wire ropes and the inverted triangle are combined together to form a stable structure, meanwhile, the low-smoke zero-halogen sheathing material is wrapped outside the wire ropes, so that the wire ropes and the external sheaths form a triangular shape, and no matter what external force comes from the wire ropes, the wire ropes can be better dissolved and borne.

Furthermore, the steel wire rope with the diameter of 4.5mm is adopted, the distance from the circle center of the steel wire rope to the circle center of the whole cable is larger than the circle center distance of the wire core, the steel wire rope is guaranteed to bear more direct stress under the condition of extrusion or bearing, meanwhile, in order to guarantee the relative positions of the steel wire rope and the wire core, a plurality of connecting steel wire belts are arranged between the outer part of the steel wire rope and the wire core, a certain moving space is formed, the steel wire rope is convenient to use and has close connection, the correspondence is guaranteed in transportation and use, and meanwhile, the distance between every two adjacent steel wire belts is 8 cm.

Further, the outer surfaces of the wire core and the steel wire rope are coated with a heat insulation belting layer, and the heat insulation belting layer is formed by winding and wrapping a glass fiber belt and is used for further fixing the relative positions of the wire core and the steel wire rope; then, a heat-insulating fireproof layer is extruded outside the glass fiber wrapping tape, and a ceramic polyolefin material is used, and the thickness is 1.5 mm. The ceramic polyolefin material has excellent fireproof characteristic, can form hard ceramic-like hard shell under the burning of flame, and the hard shell does not melt or drip under the fire environment (650-3000 ℃), and has excellent heat insulation and fire insulation effects. The steel wire is galvanized steel wire, and the diameter of the monofilament of the steel wire is 3 mm.

In another embodiment, the core comprises three wire cores, three steel wire ropes are filled in gaps among the three wire cores, each wire core comprises a conductor, and a conductor shielding layer, an insulating shielding layer and a copper strip shielding layer are sequentially wound outside the conductor; the outer protective layer comprises a heat insulation belting layer, a steel wire armor layer, a fireproof layer and an outer protective layer from inside to outside in sequence.

Further, three sinle silks are the triangle-shaped overall arrangement, and three wire rope also are the triangle-shaped overall arrangement and three sinle silks and correspond the setting, and every wire rope inlays and locates in the clearance between two sinle silks, fills inorganic glass fiber rope between three sinle silks, three wire rope and outer jacket. The steel wire rope with the diameter of 5.5mm is adopted, and the steel wire rope is extruded with the steel wire rope sheath 7, so that the steel wire rope is in a circular outline, and the distance between the centers of each steel wire rope is larger than that between the centers of the wire cores.

In practical use, it is found that because the steel wire rope is arranged at the gap between the two wire cores, when the steel wire rope is extruded, the steel wire rope is easy to be further embedded into the gap, so that the impact resistance effect is weakened, in order to improve the impact resistance and the deformation resistance of the steel wire rope, an elastic sheet with a circular arc-shaped section is arranged at the gap between the adjacent wire cores, the arc-shaped section faces the steel wire rope, when the steel wire rope is extruded to slide towards the gap under stress, the elastic sheet exerts rebound force to ensure that the steel wire rope reduces the sliding towards the gap, and the impact resistance of the steel wire rope is improved, the elastic sheet is arranged every 20-30cm along the axial direction of the cable, and further, the circular arc-shaped elastic sheet is arranged on the back of a working face, namely the back of the arc-shaped section is provided with a V-shaped support.

Particularly, the steel wire armor layer is closely arranged in the cable core periphery by the steel wire and is constituteed, and the clearance between steel wire and the steel wire is minimum, and total clearance is not more than a steel wire external diameter between the steel wire. The steel wire armor layer is formed by the reverse armor of 2 layers of steel wires, and the inlayer left side, outmost right side, then upper and lower two-layer stagger arranges, forms the screen panel of steel wire armor, further plays reinforced (rfd) effect, and this structure has the cushioning effect that the axial is shocked resistance simultaneously. Here, the innermost layer of steel wire is 2mm diameter steel wire and the outer layer is 2.5mm diameter steel wire. The thickness of the fireproof layer is 1.8-3 mm; the outer sheath is extruded on the fireproof layer in an extrusion mode, the thickness of the outer sheath is 2.5-4.0 mm, and the outer sheath is made of a low-smoke halogen-free sheath material.

In a specific embodiment, the core comprises three wire cores, three steel wire ropes are filled in gaps among the three wire cores, each wire core comprises a conductor, and a conductor shielding layer, an insulating shielding layer and a copper strip shielding layer are sequentially wound outside the conductor; the outer protective layer comprises a heat insulation belting layer, a steel wire armor layer, a fireproof layer and an outer protective layer from inside to outside in sequence.

Conductor stranding is performed first. The round pressing copper conductor is adopted, the conductor structure is compact, and under the same conductor sectional area, the outer diameter of the pressed conductor is reduced by about 10 percent, so that the outer diameter of a product is reduced, and the installation and the laying are convenient. And then three layers are co-extruded. The conductor shielding layer, the insulating layer and the insulating shielding layer adopt a three-layer co-extrusion production mode, the conductor shielding material, the cross-linked polyethylene insulating material and the insulating shielding material are coated on the compressed conductor at one time, and an extrusion type production process is adopted, so that the three layers of materials are tightly combined together, the secondary pollution of the insulating material is avoided, and the process quality of the product is ensured. Then, each insulating wire core is wrapped with a 0.1-0.12 mm copper strip in an overlapping mode, electric field interference is shielded, an electric field is balanced, and besides the fact that an insulating shield (a semi-conductive shield) is guaranteed to be the ground potential (a neutral point), grounding fault current can also pass through. During cabling, the cable cores are twisted in the right direction, the three cable cores are positioned in the middle of the cable core and form a triangular structure, and the three steel wire ropes are in a three-size-three-dimensional symmetrical structure in the gaps among the three cable cores. 5mm of steel wire rope, and 1.5mm of low smoke halogen-free sheathing material extruded outside the steel wire rope. The steel wire rope plays a role in bearing when being hoisted. And inorganic glass fiber ropes are filled in gaps between the cable cores and the steel wire ropes, so that the finished cables are round and neat. 2 layers of glass fiber belts are wrapped outside the cable core, the belt thickness is 0.2mm, the cable core is tightly and circularly formed around the wrapping belt, and the glass fiber belts are nontoxic and have high temperature resistance, fire resistance and excellent heat insulation performance.

The heat-insulating and fire-proofing layer is extruded outside the glass fiber wrapping band, and ceramic polyolefin material is used. The thickness is 1.0mm-2.5mm according to different specifications. The ceramic polyolefin material has excellent fireproof characteristic, can form hard ceramic-like hard shell under the burning of flame, and the hard shell does not melt or drip under the fire environment (650-3000 ℃), and has excellent heat insulation and fire insulation effects.

The steel wires of the steel wire armor layer are galvanized steel wires, and the diameters of steel wire monofilaments are 2.0mm,2.5mm and 3.15mm according to different specifications; the number of the roots is 50-80. Armor steel wire and wire rope play the cable bearing effect together, and simultaneously, the armor steel wire has impact resistance, forms the layer of keeping off a fire, prevents that flame from stretching into inside the cable, effectively protects the cable core and prevents external force striking damage.

The thickness of the fireproof layer is 2.0mm, the material is a mixture formed by mixing aluminum hydroxide hydrate (or magnesium hydroxide hydrate) and sodium silicate according to a certain proportion, and the mixture contains a large amount of aluminum hydroxide hydrate (or magnesium hydroxide hydrate), so that a large amount of water is decomposed at high temperature to form water mist, and the effects of cooling and fire prevention are achieved. When the fire-proof layer is extruded, two layers of high-flame-retardant wrapping belts are overlapped and wrapped after the fire-proof layer is discharged from a die opening, so that the fire-proof mud is prevented from dripping and overflowing. After high temperature, a hard shell can be formed, the heat insulation performance is good, the heat conductivity coefficient is 0.09W/Mk, particularly, the interior after ablation is uniform honeycomb, and the fire resistance and the heat insulation performance are better.

The outer sheath is extruded on the fireproof layer in an extrusion mode, and the thickness of the outer sheath is 2.5-4.0 mm. The material adopts low smoke zero halogen sheathing material, and the outer sheath plays a role in protection.

To sum up, the utility model has the advantages as follows:

1. excellent fire resistance: the cable has a double fire-proof structure, the flame temperature of the cable is not lower than 750 ℃ under the rated working voltage, and the fuse is not broken within 90min of the fire supply time.

2. Excellent self-load bearing properties: the double-bearing structure design has the advantages that three steel wire ropes in the cable core bear the load, and the steel wires outside the cable core are armored to bear the load, so that the inner and outer bearings of the cable are stable in a vertical state, and the normal operation of the cable is guaranteed.

3. The economic efficiency is as follows: reasonable in design's structure chooses for use suitable fire-resistant fireproof material, has both satisfied the fire-resistant needs of cable, considers material selection, structure size, electrical property again, reaches reduce cost's purpose simultaneously.

4. The environment-friendly type: no heavy metal, no toxicity, no smell, no influence on human body and environment.

5. The heat insulation performance is good, the heat conductivity coefficient is 0.09W/Mk, particularly, the interior after ablation is uniform honeycomb, and the heat insulation performance has better fire resistance and heat insulation performance.

It should be noted that many variations and modifications of the embodiments of the present invention are possible, which are fully described, and are not limited to the specific examples of the above embodiments. The above embodiments are merely illustrative of the present invention and are not intended to limit the present invention. In conclusion, the scope of the present invention shall include those changes or substitutions and modifications which are obvious to those of ordinary skill in the art, and shall be subject to the appended claims.

Claims (4)

1. A medium-voltage fireproof cable for a vertical shaft or a high-rise building comprises a core body and an outer protective layer arranged outside the core body, and is characterized in that the core body comprises three wire cores, three steel wire ropes are filled in gaps among the three wire cores, each wire core comprises a conductor, a conductor shielding layer, an insulating shielding layer and a copper strip shielding layer are sequentially wound outside the conductor, and inorganic glass fiber ropes are filled among the three wire cores, the three steel wire ropes and the outer protective layer; the outer protective layer comprises a heat insulation belting layer, a heat insulation fireproof layer, a steel wire armor layer, a fireproof layer and an outer protective layer from inside to outside in sequence.

2. The medium voltage fireproof cable according to claim 1, wherein three wire cores are in a triangular layout, three steel wire ropes are also in a triangular layout and are arranged corresponding to the three wire cores, and each steel wire rope is embedded in a gap between two wire cores; the steel wire rope with the diameter of 4-6mm is adopted, the steel wire rope is extruded with the steel wire rope sheath, so that the steel wire rope is in a circular or triangular shape, and the center distance of each steel wire rope is larger than that of each wire core.

3. The medium voltage fireproof cable for vertical shafts or high-rise buildings according to claim 1, wherein the thermal insulation band layer is formed by wrapping a glass fiber band to fix the relative positions of the wire core and the steel wire rope; the heat-insulating and fire-proof layer is formed by extruding ceramic polyolefin material.

4. A medium voltage fireproof cable for vertical shaft or high-rise building according to claim 1, wherein the steel wire armor layer is braided by at least two layers of steel wires, wherein the clearance between the inner layer steel wires and the steel wires is larger than that between the outer layer steel wires, the outer layer steel wires are provided with braided fixing knots, the steel wires are galvanized steel wires, and the diameter of the monofilament of the steel wires is 2-3.5 mm.

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