CN216528093U - Low-smoke low-halogen B2-level flame-retardant direct-current traction power cable - Google Patents

Abstract

The utility model discloses a low-smoke low-halogen B2-grade flame-retardant direct-current traction power cable which comprises a cable core; the flame retardant coating is wrapped outside the cable core; the insulating layer is extruded outside the refractory layer; the waterproof layer is wrapped on the fireproof layer; the fire insulation layer is extruded outside the water blocking layer and is a red phosphorus fire insulation layer coated by a plurality of layers of microcapsules; the outer sheath is arranged outside the fire-isolating layer and is a vinyl chloride homopolymer sheath. The fire barrier layer of the utility model adopts a plurality of layers of microcapsules to coat the red phosphorus fire barrier layer, the heat release is low during the combustion under the flame, and a complete coating layer is formed after the combustion to prevent the flame from spreading to internal structural elements; the outer sheath adopts vinyl chloride homopolymer, and the optimal balance of flame retardant property, anti-dripping property, low heat release property and low smoke release property of the finished cable is realized.

Description

Low-smoke low-halogen B2-level flame-retardant direct-current traction power cable

Technical Field

The utility model relates to the technical field of cable manufacturing, in particular to a low-smoke low-halogen B2-grade flame-retardant direct-current traction power cable.

Background

China deeply researches European Union EN 130501-6: 2004 fire classification of building products and Components part 6: the grading of the fire reaction test data of the cable is adopted, and the national standard GB 31247-2014 grading of the combustion performance of the cable and the optical cable and a matched test method GB/T31248-2014 testing methods for flame spread, heat release and smoke generation characteristics of the cable or the optical cable under the condition of fire are formulated according to the current state of China, so that the combustion performance of the heat release characteristics, the smoke generation characteristics, the flame propagation characteristics, the corrosivity and the like of the wire and cable product during combustion are more comprehensively considered. Due to the key characteristic that people are highly dense, the subway especially focuses on the safety characteristic of products, so that since 2017 on the number 4 line of the Western-An subway, B1-grade flame-retardant cables are comprehensively designed and used in domestic subways.

The ministry of public Security, Min, 4.4.10.2018, issued the regulations of technical requirements for enhancing the fire protection design for civil buildings with a building height of more than 250 m (trial): in the building engineering with the building height of more than 250 meters, the power supply cables of the fire elevator and the auxiliary evacuation elevator are required to adopt the burning performance of A grade, and the other fire power distribution cables are required to adopt the flammable performance of not less than B1 grade. The flame performance of the non-fire wire cable should not be lower than class B2.

DGJ08-2048-2016 Electrical fire protection design rules for civil buildings in Shanghai, stipulate: public buildings with building height more than 250 meters, high-rise public buildings with building area more than 250000m2 and underground or semi-underground shops with building area more than 40000m2 all use cables meeting the B1-grade flame retardant test. Related regulations of B1-level flame-retardant cables are newly added in the draft of JGJ16 civil building electrical design specifications and GB 50216 building design fire-retardant specifications.

The existing cable cannot realize balanced combustion performance, flame retardant performance and mechanical performance, and cannot simultaneously realize high-safety, low-smoke low-halogen, low-heat-release and low-smoke B2-grade flame retardant, fire-resistant, rat-proof, termite-proof, sunlight-resistant and other performances.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a low-smoke low-halogen B2-grade flame-retardant direct-current traction power cable, which solves the technical problems that the cable in the prior art cannot realize balanced combustion performance, flame retardant performance and mechanical performance, and cannot simultaneously have the performances of high safety, low smoke and low halogen, low heat release, low smoke and B2-grade flame retardance, fire resistance, rat prevention, termite prevention, sunlight resistance and the like.

In order to achieve the purpose, the technical scheme of the utility model is as follows:

a low smoke low halogen B2 grade flame retardant DC traction power cable, comprising:

a cable core;

the flame retardant coating is wrapped outside the cable core;

the insulating layer is extruded outside the refractory layer;

the waterproof layer is wrapped on the fireproof layer;

the fire insulation layer is extruded outside the water blocking layer and is a red phosphorus fire insulation layer coated by a plurality of layers of microcapsules;

the outer sheath is arranged outside the fire-isolating layer and is a vinyl chloride homopolymer sheath.

By adopting the scheme, the fire-insulating layer is formed by coating the red phosphorus fire-insulating layer with a plurality of layers of microcapsules, has low heat release (HRR is less than or equal to 150MJ/m2), a smoke generation rate peak value (SPR is less than 0.8W/S) and an oxygen index (OI is more than or equal to 55) during combustion under flame, and forms a complete coating layer after combustion to prevent the flame from spreading to an internal structural element;

the outer sheath is a vinyl chloride homopolymer and has an oxygen index (OI > 42), a duration of ignition (Tf > 1500ms)), a duration of self-extinguishing (Tf < 3000ms), a shell integrity after combustion, a peak heat release rate (HRR < 55kW/m2) and a total amount (THR < 200MJ/m2), a smoke density with flame (Dm < 200), a smoke density without flame (Dm < 450), a total smoke production (TSP < 90.5m2) and a peak smoke production rate (SPR < 0.7W/S), termite resistance (corrosion rating: level 1), rat resistance (protection level: remarkable), sunlight resistance (1008h), and the optimal balance of flame retardant property, molten drop resistance, low heat release property and low smoke release property of the finished cable is realized.

On the basis of the technical scheme, the utility model can be further improved as follows:

furthermore, the cable core is formed by regularly twisting a plurality of annealed round copper wires.

By adopting the scheme, the cable conductor has round appearance, and the quality of the conductor is strictly ensured; the cable has certain flexibility while ensuring good electrical property of the product, ensures the sustainable bending of the cable, is convenient to install in a narrow space, and is convenient and fast.

Further, the fire-resistant layer is a double-layer lapped fire-resistant mica tape, the nominal thickness of the fire-resistant mica tape is 0.14mm, and the lapping overlapping rate is 15% -25%.

By adopting the scheme, the double-layer wrapped fire-resistant mica tape can keep the integrity of the circuit for a period of time under the condition of extreme fire.

Further, the insulating layer is a crosslinked polyethylene insulating layer.

By adopting the scheme, the excellent electrical performance and the good mechanical strength of the cable are ensured.

Furthermore, the waterproof layer comprises a nano-coating waterproof wrapping belt wrapped outside the fireproof layer and a high-silica fireproof flame-retardant cloth belt wrapped outside the nano-coating waterproof wrapping belt.

Through adopting above-mentioned scheme, the band that blocks water is around wrapping including, fire-resistant fire-retardant strap is around wrapping outside, guarantees on the one hand that the cable has good water blocking performance, and the compact cladding of on the other hand insulation core makes it can keep the ability of route work under extreme condition in the protective layer.

Further, the nominal thickness of the nano-coating water-blocking wrapping tape is 0.2mm, and the wrapping overlapping rate is 15% -25%; the nominal thickness of the high-silica fire-resistant flame-retardant cloth belt is 0.2mm, and the lapping overlapping rate is 15-25%.

Compared with the prior art, rush to that beneficial effect is:

1. the outer sheath layer of the cable adopts a vinyl chloride homopolymer sheath, the fire barrier layer adopts a red phosphorus fire barrier layer coated by a plurality of layers of microcapsules, the cable performance is comprehensively designed, and the cable performance meets the requirements of B1-grade flame retardance, such as flame spread FS less than or equal to 2.5m, vertical flame spread H less than or equal to 425mm, flame resistance and combustion drop/particle grade d0 or d 1-grade anti-dripping performance specified by GB 31247;

2. the utility model adopts the combination of a vinyl chloride homopolymer sheath and a multi-layer microcapsule-coated red phosphorus fire-barrier layer to realize the low-release thermal performance of the B2-grade flame-retardant heat release rate peak value HRR not more than 60kW specified by the finished cable GB 31247, and the total heat release THR1200 not more than 30MJ within 1200s of fire;

3. the utility model adopts the combination of the chloroethylene homopolymer sheath and the multi-layer microcapsule-coated red phosphorus fire-barrier layer, realizes the low-release smoke performance that the smoke density (minimum light transmittance) It of the finished cable is more than or equal to 40 percent, the peak value SPR peak value of the smoke-producing rate in B2-grade flame retardance meeting the requirement of GB 31247 is less than or equal to 1.5m2/s, and the total smoke-producing TSP1200 within 1200s of fire is less than or equal to 400m 2;

4. according to the utility model, through an excellent waterproof structural design, the cable meets the requirements of a 288h soaking test;

5. the cable adopts a good fire-resistant structure, so that the cable has the operation capability of keeping the power-on work for more than 180min under the environment with the flame temperature of more than 950 ℃.

Drawings

In order to more clearly illustrate the detailed description of the utility model or the technical solutions in the prior art, the drawings that are needed in the detailed description of the utility model or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.

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

Shown in the figure:

1. a cable core;

2. a refractory layer;

3. an insulating layer;

4. a water resistant layer; 401. a water-blocking wrapping tape with a nano coating; 402. a high silica fire resistant flame retardant cloth tape;

5. a fire barrier layer;

6. an outer sheath.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.

It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the utility model pertains.

In the description of the present application, it is to be understood that the terms "center", "thickness", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

As shown in fig. 1, the low-smoke low-halogen B2-grade flame-retardant dc traction power cable provided by this embodiment includes a cable core 1, a flame retardant layer 2, an insulating layer 3, a water blocking layer 4, a fire barrier layer 5, and an outer sheath 6.

The cable core 1 is formed by regularly stranding a plurality of annealed round copper wires, and fine processing is carried out by adopting drawing annealing and stranding equipment of Neuhf in Germany, so that the precision of the round copper wires for stranding the conductor is ensured to be 0.003mm, and the tolerance of the outer diameter of the cable core 1 is 0.01 mm.

The cable conductor has round appearance, and the quality of the conductor is strictly ensured; the cable has certain flexibility while ensuring good electrical property of the product, and can ensure the sustainability of the cable

Bending, convenient installation in narrow space, convenience and rapidness.

The fire-resistant layer 2 is wrapped outside the cable core 1; the fire-resistant layer 2 is a double-layer lapped fire-resistant mica tape, the nominal thickness of the fire-resistant mica tape is 0.14mm, and the lapping overlapping rate is 15-25%.

The double-layer wrapped fire-resistant mica tape ensures that the integrity of the circuit can be kept for a period of time under the condition of extreme fire.

The insulating layer 3 is extruded outside the fire-resistant layer 2, and the insulating layer 3 is a cross-linked polyethylene insulating layer 3, so that excellent electrical performance and good mechanical strength of the cable are ensured.

Waterproof layer 4 is around packing at flame retardant coating 2, and waterproof layer 4 includes the package of package at the flame retardant coating of the outer nanometer coating of flame retardant coating tape 401 and the package of the fire-retardant strap 402 of high silica fire resistance outside nanometer coating tape 401 that blocks water of flame retardant coating 2.

The nominal thickness of the nano-coating water-blocking tape 401 is 0.2mm, and the wrapping overlapping rate is 15% -25%; the nominal thickness of the high-silica fire-resistant flame-retardant cloth belt 402 is 0.2mm, and the lapping overlapping rate is 15-25%.

The waterproof wrapping tape is wrapped inside, and the fireproof flame-retardant cloth tape is wrapped outside, so that the cable is guaranteed to have excellent waterproof performance on one hand, and the insulating wire cores are densely wrapped in the protective layer on the other hand, and the cable can keep the capacity of passage work under extreme conditions.

The fire-proof layer 5 is extruded outside the water-proof layer 4, and the fire-proof layer 5 is a red phosphorus fire-proof layer 5 coated by a plurality of layers of microcapsules.

The outer sheath 6 is arranged outside the fire-insulating layer 5, and the outer sheath 6 is a vinyl chloride homopolymer sheath.

The fire barrier layer 5 adopts a plurality of layers of microcapsules to coat the red phosphorus fire barrier layer 5, has low heat release (HRR is less than or equal to 150MJ/m2), a smoke generation rate peak value (SPR is less than 0.8W/S) and an oxygen index (OI is more than or equal to 55) during combustion under flame, and forms a complete coating layer after combustion to prevent the flame from spreading to an internal structural element;

the outer sheath 6 is a vinyl chloride homopolymer, with an oxygen index (OI > 42), a duration of ignition (Tf > 1500ms)), a duration of self-extinguishing (Tf < 3000ms), a shell integrity after combustion, a peak heat release rate (HRR < 55kW/m2) and a total (THR < 200MJ/m2), a smoke density with flame (Dm < 200), a smoke density without flame (Dm < 450), a total smoke production (TSP < 90.5m2) and a peak smoke production rate (SPR < 0.7W/S), termite resistance (corrosion rating: level 1), rat resistance (protection level: remarkable), sunlight resistance (1008h), and the optimal balance of flame retardant property, molten drop resistance, low heat release property and low smoke release property of the finished cable is realized.

The outer sheath 6 layer of the cable adopts a vinyl chloride homopolymer sheath, the fire insulation layer 5 adopts a red phosphorus fire insulation layer 5 coated by a plurality of microcapsules, the cable performance is comprehensively designed, and the cable performance meets the requirements of B1-grade flame retardance, such as flame spread FS less than or equal to 2.5m, vertical flame spread H less than or equal to 425mm, flame resistance and combustion drop/particle grade d0 or d 1-grade anti-dripping performance specified by GB 31247;

in the embodiment, a vinyl chloride homopolymer sheath and a multi-layer microcapsule-coated red phosphorus fire-insulating layer 5 are combined to realize the low-release thermal performance that the heat release rate peak value HRR peak value of B2-grade flame retardance specified in the finished cable GB 31247 is less than or equal to 60kW, and the total heat release THR1200 in a fire 1200s is less than or equal to 30 MJ;

in the embodiment, the combination of a vinyl chloride homopolymer sheath and a multi-layer microcapsule-coated red phosphorus fire-insulating layer 5 is adopted, so that the smoke density (minimum light transmittance) It of the finished cable is more than or equal to 40 percent, the peak value SPR peak value of the smoke generation rate in B2-grade flame retardance meeting the requirement of GB 31247 is less than or equal to 1.5m2/s, and the low smoke release performance of the total smoke generation TSP1200 within 1200s of fire is less than or equal to 400m 2;

in the embodiment, the cable meets the requirements of a 288h soaking test by adopting an excellent waterproof structural design;

the cable of the embodiment adopts a good fire-resistant structure, so that the cable has the operation capacity of keeping the power-on work for more than 180min under the environment with the flame temperature of more than 950 ℃.

In the description of the present invention, numerous specific details are set forth. It is understood, however, that embodiments of the utility model may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the utility model has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.

Claims (5)

1. A low-smoke low-halogen B2-grade flame-retardant direct-current traction power cable is characterized by comprising the following structures:

a cable core;

the flame retardant coating is wrapped outside the cable core;

the insulating layer is extruded outside the refractory layer;

the waterproof layer is wrapped outside the insulating layer;

the fire insulation layer is extruded outside the water blocking layer and is a red phosphorus fire insulation layer coated by a plurality of layers of microcapsules;

the outer sheath is arranged outside the fire-isolating layer and is a vinyl chloride homopolymer sheath;

the waterproof layer comprises a nano-coating waterproof wrapping tape wrapped outside the fireproof layer and a high-silica fireproof flame-retardant cloth tape wrapped outside the nano-coating waterproof wrapping tape.

2. The low-smoke low-halogen B2-grade flame-retardant direct-current traction power cable as claimed in claim 1, wherein the cable core is formed by regularly stranding a plurality of annealed round copper wires.

3. The low-smoke low-halogen B2-grade flame-retardant direct-current traction power cable according to claim 1, wherein the flame-retardant layer is a double-layer wrapped fire-resistant mica tape, the fire-resistant mica tape has a nominal thickness of 0.14mm, and the wrapping overlapping rate is 15% -25%.

4. The low smoke, low halogen B2 grade flame retardant dc traction power cable of claim 1, wherein the insulation layer is a cross-linked polyethylene insulation layer.

5. The low-smoke low-halogen B2-grade flame-retardant direct-current traction power cable according to claim 1, wherein the nominal thickness of the nano-coating water-blocking tape is 0.2mm, and the wrapping overlapping rate is 15-25%; the nominal thickness of the high-silica fire-resistant flame-retardant cloth belt is 0.2mm, and the lapping overlapping rate is 15-25%.

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