B2-level flame-retardant low-voltage power cable

Abstract

The utility model belongs to the technical field of low-voltage power cables, and provides a B2-level flame-retardant low-voltage power cable, which comprises a conductor, an insulating layer arranged outside the conductor, a belting layer arranged outside the insulating layer, and a low-smoke halogen-free flame-retardant polyolefin oxygen barrier layer arranged outside the belting layer, and the interlocking armor layer is arranged outside the low-smoke halogen-free flame-retardant polyolefin oxygen barrier layer. An insulating layer is arranged on the outer wall of the conductor, and a belting layer, a low-smoke halogen-free flame-retardant polyolefin oxygen barrier layer and an interlocking armor layer are sequentially arranged outside the insulating layer; the arrangement of the insulating layer improves the heat resistance grade and the current-carrying capacity of the cross section of the unit conductor; a flame-retardant structure formed by the low-smoke halogen-free flame-retardant polyolefin oxygen barrier layer and the linkage armor layer is few in combustible materials and good in flame-retardant performance, the fire spreading risk is effectively reduced, the flame-retardant and fireproof performance of the B2 cable is improved, the bending resistance of the cable can be improved through the linkage armor layer, and laying and installation are convenient.

Description

Technical Field

[0001] The utility model belongs to the technical field of low-voltage power cables, and particularly relates to a B2-class flame-retardant low-voltage power cable. Background Art

[0002] According to relevant technical standards, the main technical performances required for a flame-retardant B2-class cable include: flame spread FS ≤ 2.5 m, peak heat release rate HRR peak ≤ 60 kW, total heat release THR1200 within 1200 s of fire exposure ≤ 30 MJ, fire growth rate index FIGRA ≤ 300 W / s, peak smoke production rate SPR peak ≤ 1.5 m2 / s, and total smoke production TSP1200 within 1200 s of fire exposure ≤ 400 m2.

[0003] The inventor found that a flame-retardant B2-class cable with a traditional structure cannot pass the flame-retardant B2-class test according to the above relevant technical standards. The main manifestations are that the heat resistance level of the current flame-retardant B2-class cable is not high, the current-carrying capacity per unit conductor cross-section of the cable is not high, and the fire protection performance and bending resistance ability are not high, etc., thus affecting the service life of the cable and increasing the maintenance cost. Summary of the Utility Model

[0004] In order to solve the above problems, the utility model provides a B2-class flame-retardant low-voltage power cable. The insulation layer of the utility model improves the heat resistance level and the current-carrying capacity per unit conductor cross-section; the flame-retardant structure composed of a low-smoke and halogen-free flame-retardant polyolefin oxygen barrier layer and a interlocking armor layer has few combustibles and good non-flammable performance, effectively reducing the risk of fire spread, improving the flame-retardant and fire protection performance of the B2 cable, and the interlocking armor layer can improve the bending resistance ability of the cable, facilitating laying and installation.

[0005] According to some embodiments, the utility model provides a B2-class flame-retardant low-voltage power cable, adopting the following technical solution:

[0006] A B2-class flame-retardant low-voltage power cable includes a conductor, an insulation layer arranged outside the conductor, a tape layer arranged outside the insulation layer, a low-smoke and halogen-free flame-retardant polyolefin oxygen barrier layer arranged outside the tape layer, and an interlocking armor layer arranged outside the low-smoke and halogen-free flame-retardant polyolefin oxygen barrier layer.

[0007] Further, the conductor is formed by stranding an oxygen-free copper rod, an aluminum rod or an aluminum alloy rod after drawing.

[0008] Further, there are multiple conductors, and insulation layers are arranged outside all the multiple conductors.

[0009] Further, inside the tape layer, the conductor and the insulation layer form an insulated wire core; there are multiple insulated wire cores, and a filling core is arranged between the multiple insulated wire cores.

[0010] Furthermore, the filling core is an inorganic paper rope filling material.

[0011] Furthermore, a refractory mica tape is also arranged between the conductor and the insulating layer.

[0012] Furthermore, the refractory mica tape is a phlogopite tape.

[0013] Furthermore, the insulating layer is a low-smoke and halogen-free polypropylene insulating material.

[0014] Furthermore, the tape layer is a multi-layer low-smoke and halogen-free flame-retardant tape.

[0015] Furthermore, the interlocking armor layer includes an aluminum alloy tape and a stainless steel tape.

[0016] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0017] In the present utility model, an insulating layer is arranged on the outer wall of the conductor, and a tape layer, a low-smoke and halogen-free flame-retardant polyolefin oxygen isolation layer, and an interlocking armor layer are sequentially arranged outside the insulating layer; the arrangement of the insulating layer improves the heat resistance level and the current-carrying capacity per unit conductor cross-section; the flame-retardant structure jointly formed by the low-smoke and halogen-free flame-retardant polyolefin oxygen isolation layer and the interlocking armor layer has few combustibles and good non-flammable performance, effectively reducing the risk of fire spread, improving the flame-retardant and fire-proof performance of the B2 cable, and the interlocking armor layer can improve the bending resistance of the cable, facilitating laying and installation.

[0018] The present utility model adopts an interlocking armor layer including metal tapes such as aluminum alloy tapes and stainless steel tapes, improving the bending resistance performance of the cable.

[0019] The present utility model adopts a filling core of inorganic paper rope, a low-smoke and halogen-free flame-retardant tape layer, a low-smoke and halogen-free flame-retardant polyolefin oxygen isolation layer, and an interlocking armor layer to jointly form a flame-retardant layer, which has few combustibles, good oxygen isolation performance and non-flammable performance, effectively reducing the risk of fire spread and improving the flame-retardant and fire-proof ability of the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The schematic diagram of the drawings forming a part of the present utility model is used to provide a further understanding of the present utility model. The schematic embodiments and descriptions thereof of the present utility model are used to explain the present utility model and do not constitute an improper limitation to the present utility model.

[0021] Figure 1 is a schematic structural diagram of the present utility model;

[0022] Among them: 1. Conductor; 2. Refractory mica tape; 3. Insulating layer; 4. Filling core; 5. Tape layer; 6. Low-smoke and halogen-free flame-retardant polyolefin oxygen isolation layer; 7. Interlocking armor layer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The present utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0024] It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present utility model. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present utility model belongs.

[0025] Mica tape, also known as fire-resistant mica tape, is made by a mica tape machine and is a fire-resistant insulating material. It can be divided into mica tape for motors and mica tape for cables according to its use.

[0026] Through tests, traditional flame-retardant B2-class cables cannot pass the B2-class flame-retardant test according to current relevant technical standards. The main problems are that the heat-resistant grade of current B2-class flame-retardant cables is not high, the current-carrying capacity per unit conductor cross-section of the cables is not high, and the fire-proof performance and bending resistance are not high, etc., which affect the service life of the cables and increase the maintenance cost. That is to say, current relevant technical standards are difficult to meet the increasingly strict and more scientific and reasonable technical standard requirements and cannot adapt to the development needs of the market and technology.

[0027] Based on the problems such as the low heat-resistant grade of current B2-class flame-retardant cables, the low current-carrying capacity per unit conductor cross-section of the cables, and the low fire-proof performance and bending resistance, etc., as Figure 1 shown, this embodiment provides a B2-class flame-retardant low-voltage power cable, which includes a conductor 1, a fire-resistant mica tape 2 arranged outside the conductor, an insulating layer 3 arranged outside the fire-resistant mica tape 2, a tape layer 5 arranged outside the insulating layer 3, a low-smoke and halogen-free flame-retardant polyolefin oxygen barrier layer 6 arranged outside the tape layer 5, and a interlocking armor layer 7 arranged outside the low-smoke and halogen-free flame-retardant polyolefin oxygen barrier layer 6.

[0028] Specifically, the tape layer 5, the low-smoke and halogen-free flame-retardant polyolefin oxygen barrier layer 6 and the interlocking armor layer 7 are sequentially arranged outside the insulating layer 3; the arrangement of the insulating layer 3 improves the heat-resistant grade and the current-carrying capacity per unit conductor cross-section; the flame-retardant structure jointly composed of the low-smoke and halogen-free flame-retardant polyolefin oxygen barrier layer 6 and the interlocking armor layer 7 has few combustibles and good non-flammable spreading performance, effectively reducing the risk of fire spread and improving the flame-retardant and fire-proof performance of the B2 cable. Moreover, the interlocking armor layer can improve the bending resistance of the cable and facilitate laying and installation.

[0029] In some embodiments, there are multiple conductors 1, such as three conductors. The refractory mica tape 2 and the insulating layer 3 are disposed outside each of the multiple conductors 1. Optionally, the conductor 1 is a conventional aluminum wire conductor, an aluminum alloy conductor, or a conductor made of other metal materials; or, the conductor 1 includes one or several of oxygen-free copper rods, aluminum rods, and aluminum alloy rods; or, the conductor 1 is formed by stranding after drawing an oxygen-free copper rod, an aluminum rod, or an aluminum alloy rod.

[0030] In some embodiments, within the tape layer 5, the conductor 1, the refractory mica tape 2, and the insulating layer 3 together form an insulated wire core. There are multiple insulated wire cores, and a filling core 4 is disposed between the multiple insulated wire cores; optionally, the filling core 4 is an inorganic paper rope filling material, which has good flame retardant and fire resistant properties; the refractory mica tape 2 is a phlogopite tape with good flame retardant and fire resistant properties; both the filling core 4 and the refractory mica tape 2 have good flame retardant and fire resistant properties, which improves the service life of the power cable.

[0031] In some embodiments, the insulating layer 3 is a low-smoke and halogen-free polypropylene insulating material. Optionally, the insulating layer 3 can be obtained by extrusion molding using a low-smoke and halogen-free flame retardant polypropylene insulating material; the tape layer 5 is a multi-layer low-smoke and halogen-free flame retardant tape. Optionally, the tape layer 5 is obtained by overlapping and winding a low-smoke and halogen-free flame retardant tape with good flame retardant and fire resistant properties.

[0032] The insulating layer 3 is a low-smoke and halogen-free polypropylene insulating material, which has excellent electrical properties and does not produce harmful by-products during the production process, being green, environmentally friendly, and pollution-free; the settings of the filling core 4, the tape layer 5, the low-smoke and halogen-free flame retardant polyolefin oxygen barrier layer 6, and the interlocking armor layer 7 have the characteristics of having less combustible materials, good flame retardant and non-propagating combustion properties, and having good flame retardant performance.

[0033] In some embodiments, the interlocking armor layer 7 includes an aluminum alloy strip and a stainless steel strip; optionally, the armor layer is made of metals such as an aluminum alloy strip and a stainless steel strip, and is obtained by interlocking armor.

[0034] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A B2-level flame-retardant low-voltage power cable, characterized in that, It includes a conductor, an insulating layer disposed outside the conductor, a tape layer disposed outside the insulating layer, a low-smoke and halogen-free flame-retardant polyolefin oxygen barrier layer disposed outside the tape layer, and an interlocking armor layer disposed outside the low-smoke and halogen-free flame-retardant polyolefin oxygen barrier layer.

2. The B2-level flame-retardant low-voltage power cable as claimed in claim 1, wherein The conductor is formed by stranding an oxygen-free copper rod, an aluminum rod or an aluminum alloy rod after drawing.

3. A B2-level flame-retardant low-voltage power cable according to claim 1, characterized in that, There are multiple conductors, and insulating layers are disposed outside all the multiple conductors.

4. A B2-level flame-retardant low-voltage power cable according to claim 3, characterized in that, Inside the tape layer, the conductor and the insulating layer form an insulated core; there are multiple insulated cores, and a filling core is disposed between the multiple insulated cores.

5. The B2-level flame-retardant low-voltage power cable according to claim 4, wherein The filling core is an inorganic paper rope filling material.

6. A B2-level flame-retardant low-voltage power cable according to claim 1, characterized in that, A refractory mica tape is further disposed between the conductor and the insulating layer.

7. A B2-level flame-retardant low-voltage power cable according to claim 6, characterized in that, The refractory mica tape is a phlogopite tape.

8. A Class B flame-retardant low-voltage power cable as claimed in claim 1, wherein, The insulating layer is a low-smoke and halogen-free polypropylene insulating material.

9. A B2-level flame-retardant low-voltage power cable according to claim 1, characterized in that, The tape layer is a multi-layer low-smoke and halogen-free flame-retardant tape.

10. A B2-level flame-retardant low-voltage power cable as claimed in claim 1, characterized in that, The interlocking armor layer includes an aluminum alloy tape and a stainless steel tape.

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