Light medium-voltage fire-resistant cable

Abstract

The utility model discloses a light medium-voltage fire-resistant cable, which comprises a body, the body comprises a plurality of wire cores (1), the plurality of wire cores (1) are uniformly distributed in an array in the circumferential direction, a fire insulation layer (2) is filled among the plurality of wire cores (1), the plurality of wire cores (1) and the fire insulation layer (2) are wrapped into a bundle through a wrapping tape (3) on the outer layer of the plurality of wire cores (1), and the wrapping tape (3) wraps the plurality of wire cores (1) and the fire insulation layer (2). The outer layer of the wrapping tape (3) is provided with a plurality of fireproof layers (4), the outer layer of each fireproof layer (4) comprises an outer sheath (5), and the outer sheath (5) is used for shaping the fireproof layers (4) and ensuring the mechanical strength of the body. The light-weight medium-voltage fire-resistant cable provided by the utility model is light in weight and high in fireproof grade.

Description

TECHNICAL FIELD

[0001] The utility model relates to cable field, specifically is a kind of light medium voltage fire-resistant cable. BACKGROUND

[0002] Cable is the important tool of power transmission, signal transmission, provides excellent contribution for domestic power popularization. With the development of high-rise building and the improvement of fire rating and the strengthening of people's safety consciousness, the laying of traditional cable in high-rise building has been difficult to meet the use demand because of heavy weight and low fire rating, in high-rise building, with the increase of building storey, the laying area of cable will increase, the weight of cable will also increase accordingly, so that the firmness requirement of building is also higher, so reducing the weight of cable is of great significance for high-rise building, in high-rise building, the damage caused by the spread of fire is very terrible, and cable is through the whole building, if the fire rating of cable is insufficient, causes the spread of fire along cable, that is easy to cause the burning of whole building, so the cable of light quality and high fire rating will be the best adaptive cable of high-rise building. SUMMARY

[0003] The utility model provides a kind of light medium voltage fire-resistant cable of light quality and high fire rating.

[0004] The utility model discloses the technical scheme adopted to solve the above problem is as follows: a kind of light medium voltage fire-resistant cable, including body, the body includes multiple wire cores, multiple wire cores are evenly arrayed in circumference, and multiple wire cores are filled with fire barrier layer, multiple wire cores and fire barrier layer are wrapped into bundle by wrapping tape in the outer layer of multiple wire cores, fire barrier layer is provided on the outer layer of the wrapping tape, the fire barrier layer is collectively provided with multiple layers, the outer layer of the fire barrier layer includes outer sheath, the outer sheath is used to shape fire barrier layer and ensure the mechanical strength of body.

[0005] Compared with prior art, the utility model has the advantages that in the body, in addition to the basic structure for ensuring the quality of electric transmission in wire core, the filling layer of traditional PE material is cancelled in the outer layer of wire core, effectively reduces the density of body, reduces the quality of body, in addition to wrapping tape and outer sheath outside wire core, only fire barrier layer and fire barrier layer, fire barrier layer and fire barrier layer are made of fire-retardant material, so as to effectively improve fire rating and prevent the spread of fire along cable.

[0006] As an improvement of the utility model, the fire barrier layer is filled with nanometer aerogel felt pad, through the improvement, nanometer aerogel material has many excellent properties due to its unique nanometer porous structure, such as low density, high specific surface area, low thermal conductivity, etc., is a good low mass thermal insulation material, which can meet the requirements of light weight and high fire rating at the same time, is the preferred filling material of the body.

[0007] As an improvement of the utility model, the abutting place of the core and the wrapping tape is also filled with fire barrier layer, through the improvement, the fire barrier layer between the cores is used to prevent heat transfer between the cores, and the fire barrier layer at the abutting place of the core and the wrapping tape is used to prevent heat transfer between the core and the wrapping tape, when the external heat has broken through the fire barrier layer and ignited the wrapping tape, the wrapping tape can avoid directly transferring heat to the core.

[0008] As an improvement of the utility model, a filling strip is further arranged between the two adjacent cores, the filling strip is arranged at the intersection of the symmetry line of the two adjacent cores and the wrapping tape, the outer side of the filling strip is arc-shaped and equal to the radius of the wrapping tape, and the inner side of the filling strip includes two concave arcs, and the centers of the two concave arcs are overlapped with the centers of the two cores, through the improvement, the nanometer aerogel felt pad is mainly filled layer by layer in a sheet structure, and gaps are easily formed in the position of the filling strip, if the position of the filling strip is also filled with the nanometer aerogel felt pad, the nanometer aerogel felt pad needs to be cut and processed, the working intensity of filling is greatly increased, and after cutting, the tightness of the structure is poor, if the wrapping tape at the position of the filling strip is damaged, the nanometer aerogel felt pad is easily dispersed, therefore, the filling strip is used for filling, so as to ensure the tightness of filling and reduce the cutting and processing of the nanometer aerogel felt pad, and the structure design of the filling strip better ensures the close-fitting property of the filling strip and the nanometer aerogel felt pad filling structure.

[0009] As an improvement of the utility model, the fire barrier layer is wrapped by the nanometer aerogel composite tape, through the improvement, the nanometer aerogel material can meet the requirements of light weight and high fire rating at the same time, is the fire barrier material of the body.

[0010] As an improvement of the utility model, the fire barrier layer includes a fire barrier overlapping layer formed by overlapping the nanometer aerogel composite tape, through the improvement, the comprehensiveness of the fire barrier is ensured, and heat is prevented from penetrating into the body through the gaps between the nanometer aerogel composite tapes.

[0011] As an improvement of the utility model, the fire barrier layer includes a fire barrier flat layer formed by edge connection of the nanometer aerogel composite tape, through the improvement, the wrapping condition of the fire barrier overlapping layer is provided, the deformation probability of the fire barrier overlapping layer is reduced, and the wrapping quality of the fire barrier overlapping layer is ensured.

[0012] As an improvement of this utility model, the fire-resistant layer includes multiple fire-resistant flat layers and multiple fire-resistant overlapping layers, with the fire-resistant flat layers and fire-resistant overlapping layers arranged alternately. Through this improvement, the heat energy is not easily transferred between different fire-resistant layers due to the multiple layers of heat insulation. Compared with a single-layer thick nano-scale aerogel composite tape, the heat insulation and fire-resistant effect can be greatly improved.

[0013] As an improvement of this utility model, the fire-blocking overlapping layer has three layers. In the fire-blocking overlapping layer, the overlapping width is 1 / 3 of the width of the nano-aerogel composite strip. Through this improvement, the overlapping width of the nano-aerogel composite strip is guaranteed, and heat energy is not easily penetrated.

[0014] As an improvement of this utility model, the overlapping areas of the fire-blocking overlapping layers of different layers are evenly distributed along the axial direction of the body. Through this improvement, it is ensured that the body maintains its overall uniformity after the fire-blocking overlapping layers overlap, and there will be no problem of diameter change. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall cross-sectional structure of this utility model.

[0016] Figure 2 This is a schematic diagram of the fire-resistant layer of this utility model.

[0017] The diagram shows: 1. Core wire, 2. Fireproof layer, 3. Wrapping tape, 4. Fireproof layer, 4.1. Fireproof flat layer, 4.2. Fireproof overlapping layer, 5. Outer sheath, 6. Filler strip. Detailed Implementation

[0018] The embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0019] like Figure 1 As shown, a lightweight medium-voltage fire-resistant cable includes a body comprising multiple conductors 1 arranged in a circumferentially uniform array, with a fire-resistant layer 2 filling the spaces between them. The conductors 1 and the fire-resistant layer 2 are bundled together by a wrapping tape 3. A fire-resistant layer 4 is provided outside the wrapping tape 3, and the fire-resistant layer 4 has multiple layers. The outer layer of the fire-resistant layer 4 includes an outer sheath 5, which is used to shape the fire-resistant layer 4 and ensure the mechanical strength of the body. The outer sheath 5 is made of a high flame-retardant, high-shelling, low-smoke, halogen-free flame-retardant polyolefin material, which also serves a flame-retardant function and does not produce harmful gases during combustion, thus preventing poisoning of personnel.

[0020] The fire barrier layer 2 is filled with nanometer aerogel felt pad, the abutting place of the core 1 and the wrapping tape 3 is also filled with the fire barrier layer 2, and the filling strip 6 is arranged between the two adjacent cores 1, the filling strip 6 is arranged at the intersection of the symmetric line of the two adjacent cores 1 and the wrapping tape 3, the outer side of the filling strip 6 is arc-shaped and equal to the radius of the wrapping tape 3, the inner side of the filling strip 6 includes two concave arcs, the centers of the two concave arcs are overlapped with the centers of the two cores 1 respectively, and the filling strip 6 is made of high-flame-retardant high-skin-type low-smoke halogen-free flame-retardant polyolefin material.

[0021] As shown in Figure 1 、 Figure 2 The fire barrier layer 4 is wrapped by the nanometer aerogel composite tape, the fire barrier layer 4 includes the fire barrier overlapping layer 4.2 wrapped by the overlapping nanometer aerogel composite tape, and the fire barrier layer 4 includes the fire barrier flat layer 4.1 wrapped by the nanometer aerogel composite tape along the edge, the fire barrier flat layer 4.1 includes three layers, the fire barrier overlapping layer 4.2 also includes three layers, the fire barrier flat layer 4.1 and the fire barrier overlapping layer 4.2 are arranged alternately, and the fire barrier flat layer 4.1, the fire barrier overlapping layer 4.2, the fire barrier flat layer 4.1, the fire barrier overlapping layer 4.2, the fire barrier flat layer 4.1 and the fire barrier overlapping layer 4.2 are sequentially arranged from inside to outside, in the fire barrier overlapping layer 4.2, the overlapping width is 1 / 3 of the width of the nanometer aerogel composite tape, and the overlapping positions of the fire barrier overlapping layers 4.2 of different layers are uniformly distributed along the axial direction of the body.

[0022] On each core 1, the traditional structure including a conductor, a conductor shielding layer, an insulation layer, an insulation shielding layer, a conductor wrapping tape and a metal shielding layer is sequentially arranged from inside to outside, so that the use quality of the electric transmission of the body is ensured.

[0023] Through the design of the light medium-voltage fire-resistant cable, the design of the outer sheath 5, the fire barrier layer 4 and the fire barrier layer 2 ensures the multiple fire-retardant and fire-resistant characteristics of the body, the fire is not easy to spread along the body when the fire occurs, and when the design of the fire barrier layer 4 and the fire barrier layer 2 is made of nanometer aerogel material, the fire resistance of the body is ensured, the traditional PE material is replaced, the quality of the body is greatly reduced, and the body is more suitable for high-rise buildings.

[0024] The above only describes the best embodiment of the utility model, but cannot be understood as the limitation of the claims. The utility model is not limited to the above embodiment, and the specific structure can be changed. Any change within the protection scope of the independent claims of the utility model is within the protection scope of the utility model.

Claims

1. A light weight medium voltage fire resistant cable comprising a body characterised in that: The body comprises a plurality of wire cores (1), the plurality of wire cores (1) are uniformly arranged in a circumferential direction, and the plurality of wire cores (1) are filled with fire barriers (2), the plurality of wire cores (1) and the fire barriers (2) are wrapped into a bundle by a wrapping tape (3) on an outer layer of the plurality of wire cores (1), a fire blocking layer (4) is arranged on an outer layer of the wrapping tape (3), the fire blocking layer (4) comprises a plurality of layers, and an outer sheath (5) is arranged on an outer layer of the fire blocking layer (4), the outer sheath (5) is used for shaping the fire blocking layer (4) and ensuring the mechanical strength of the body.

2. A light medium voltage fire resistant cable according to claim 1, characterized in that: The fire barriers (2) are filled with nanoscale aerogel felt pads.

3. A light medium voltage fire resistant cable according to claim 2, characterised in that: The abutting positions of the wire cores (1) and the wrapping tape (3) are also filled with the fire barriers (2).

4. A light medium voltage fire resistant cable according to claim 3, characterised in that: A filling strip (6) is arranged between the two adjacent wire cores (1), the filling strip (6) is arranged at the intersection of the symmetry line of the two adjacent wire cores (1) and the wrapping tape (3), the outer side of the filling strip (6) is in an arc shape and has a radius equal to that of the wrapping tape (3), and the inner side of the filling strip (6) comprises two concave arcs, and the centers of the two concave arcs are respectively overlapped with the centers of the two wire cores (1).

5. A light medium voltage fire resistant cable according to claim 1, characterized in that: The fire blocking layer (4) is wrapped by a nanoscale aerogel composite tape.

6. A light medium voltage fire resistant cable according to claim 5, characterised in that: The fire blocking layer (4) comprises a fire blocking overlapping layer (4.2) wrapped by overlapping nanoscale aerogel composite tapes.

7. A light medium voltage fire resistant cable according to claim 6, characterised in that: The fire blocking layer (4) comprises a fire blocking flat layer (4.1) wrapped by edge connection nanoscale aerogel composite tapes.

8. A light medium voltage fire resistant cable according to claim 7, characterised in that: The fire blocking layer (4) comprises a plurality of fire blocking flat layers (4.1) and a plurality of fire blocking overlapping layers (4.2), and the fire blocking flat layers (4.1) and the fire blocking overlapping layers (4.2) are arranged alternately.

9. A light medium voltage fire resistant cable according to claim 6, characterised in that: The fire blocking overlapping layer (4.2) comprises three layers, and in the fire blocking overlapping layer (4.2), the overlapping width is 1 / 3 of the width of the nanoscale aerogel composite tape.

10. A light medium voltage fire resistant cable according to claim 9, characterised in that: The overlapping positions of the fire blocking overlapping layers (4.2) of different layers are uniformly distributed along the axial direction of the body.

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