High-flexibility flame-retardant fireproof low-voltage soft power cable

Abstract

The invention discloses a high-flexibility flame-retardant fireproof low-voltage soft power cable, which comprises a cable core, the cable core comprises three main insulation wire cores and three ground insulation wire cores, each main insulation wire core or each ground insulation wire core comprises a conductor, the periphery of the conductor is sequentially coated with a split-phase fireproof layer and a split-phase insulation layer from inside to outside, and the split-phase fireproof layer and the split-phase insulation layer are arranged on the periphery of the cable core. The cable core further comprises a soft conductive filling layer on the periphery of the insulating wire core, and the periphery of the cable core is sequentially coated with a fire insulation layer and an outer coating layer from inside to outside. The cable has the advantages of small outer diameter, light weight, good flame retardance, fire resistance, high flexibility and reliable supportability, so that the cable has long service life and meets environmental requirements.

Description

Technical Field

[0001] The invention relates to a power cable, in particular to a highly flexible flame-retardant and fire-proof low-voltage soft power cable. Background Art

[0002] With the development of society, people's awareness of safety and environmental protection continues to grow, and the requirements for the safety and reliability of electrical equipment and devices are becoming increasingly higher. The three-phase four-wire system used for low-voltage distribution lines has been changed to a three-phase five-wire system. A protective grounding wire has been added to the original system to ground the equipment, ensuring that the harm to personnel and equipment in the event of leakage in electrical equipment is minimized. Situations with high requirements for the line operating environment, such as maintaining power for a certain period of time after a fire, preventing the fire from spreading, generating minimal smoke, and controlling the influence of external electromagnetic fields on the line itself and on other equipment, are also being considered.

[0003] Currently, the typical insulated core symmetrical structure cable used in three-phase five-wire power distribution systems is a 3+3 core power cable with a rated voltage of 0.6 / 1kV, a cross-linked elastomer insulated concentric conductor, a halogen-free low-smoke polyolefin elastomer sheath, and a flame retardant and fireproof structure. The concentric conductor of this series of cables is a composite structure of copper wire winding + copper tape overlapping winding. Due to the existence of the concentric conductor structure, the cable's flexibility is affected.

[0004] Therefore, how to improve the flexibility of cables is a problem that needs to be solved in this field. Summary of the Invention

[0005] In view of the technical problem that existing cables have low flexibility, the purpose of the present invention is to provide a highly flexible flame-retardant and fire-proof low-voltage soft power cable, which can improve the flexibility of the cable and effectively solve the problems existing in the prior art.

[0006] In order to achieve the above-mentioned purpose, the flame-retardant and fire-proof low-voltage soft power cable improved by the present invention includes a cable core; the outer periphery of the cable core is sequentially coated with a fire insulation layer and an outer coating from the inside to the outside; the cable core includes three main insulating cores and three ground insulating cores; the cable core also includes a soft conductive filling layer outside the insulating core; each main insulating core or ground insulating core includes a conductor, and the outer periphery of the conductor is sequentially coated with a phase-separated fireproof layer and a phase-separated insulating layer from the inside to the outside.

[0007] Furthermore, the three main insulated wire cores are in contact with each other, and the three ground insulated wire cores are located in edge gaps between the three main insulated wire cores.

[0008] Furthermore, the conductor is a soft copper conductor.

[0009] Furthermore, the phase-separated fireproof layer is formed by overlapping and wrapping ceramic mica tapes.

[0010] Furthermore, the phase-separated insulation layer consists of a main insulation inner layer and a color-marked outer layer, wherein the main insulation inner layer is the main body of the phase-separated insulation layer; and the color-marked outer layer is a thin surface layer of the phase-separated insulation layer.

[0011] Furthermore, the soft conductive filling layer is filled with soft copper conductor.

[0012] Furthermore, the fire insulation layer is formed by overlapping and wrapping glass fiber tapes.

[0013] Furthermore, the outer protective layer is an extruded halogen-free low-smoke polyolefin elastomer flame retardant outer sheath.

[0014] Effects of the present invention: The flame-retardant and fire-proof low-voltage soft power cable provided by the present invention comprises a cable core. The soft conductive filling layer is arranged on the periphery of the insulating core, so that the softness of the cable is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention is further described below with reference to the accompanying drawings and specific embodiments.

[0016] Figure 1 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0017] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below with reference to specific illustrations.

[0018] See also Figure 1 The flame-retardant and fireproof low-voltage soft power cable provided by the present invention is a flame-retardant and fireproof 3+3 core soft power cable with a rated voltage of 0.6 / 1kV and below, a cross-linked elastomer insulation, a halogen-free and low-smoke polyolefin elastomer outer sheath, and a flame-retardant and fireproof 3+3 core soft power cable. It is mainly used in high-rise buildings, public places and special places with fire protection requirements.

[0019] The flame-retardant and fire-proof low-voltage flexible power cable includes a cable core 100 , which includes three main insulated cores 110 and three ground insulated cores 120 . Each main insulated core 110 or ground insulated core 120 includes a conductor 200 .

[0020] The conductor 200 is a soft copper conductor, specifically a fifth type of soft copper conductor, a fifth type of tinned soft copper conductor, a sixth type of soft copper conductor, or a sixth type of tinned soft copper conductor.

[0021] The structure of the conductor 200 is not limited to the above types, and other types may also be used, depending on actual needs.

[0022] The conductor 200 is a circular structure, and is formed by twisting multiple strands of conductors in the same direction. Each strand of conductor is twisted together by a number of soft round copper wires. The twisting direction of the multiple strands of conductors is opposite to that of the single strand of conductors.

[0023] This solution specifically prefers to use a cage-type stranding machine to twist the multi-strand bundle conductors. Each strand has a detwisting function. The multi-strand bundle conductors are not twisted after being twisted, and their layers are twisted in the same direction, which improves the conductivity and flexibility of the conductor 200.

[0024] In addition, since the twisting direction of the conductor 200 in this solution is opposite to that of the single-strand bundled wire conductor, the soft round copper wire of the single-strand bundled wire conductor can be in a free state, minimizing the gap between the multi-strand bundled wire conductors, thereby reducing the outer diameter of the conductor 200.

[0025] The conductor 200 is coated with a phase-separated fireproof layer 210 and a phase-separated insulation layer 220 in sequence from the inside to the outside.

[0026] The phase-separated fireproof layer 210 is formed by overlapping and wrapping ceramic mica tapes; the ceramic mica tape includes a ceramic mica paper layer 211, a glass cloth layer 212 and an adhesive layer 213.

[0027] The ceramic mica paper layer 211 is the base material of the phase separation fireproof layer 210 , and is specifically made by uniformly spraying ceramic powder on mica paper.

[0028] The glass cloth layer 212 is used to improve the strength of the ceramic mica paper layer 211 and is fixed to the ceramic mica paper layer 211 via an adhesive layer 213 .

[0029] The adhesive layer 213 is used to facilitate the fixation between the glass cloth layer 212 and the ceramic mica paper layer 211 .

[0030] The bonding layer 213 is preferably a strip-shaped insulating material bonded with silicone resin as an adhesive, which improves the insulation performance of the phase-separated fireproof layer 210.

[0031] In this way, the phase-separated fireproof layer 210 formed by the above structure can make the present application become a ceramic hard shell after burning and still have good insulation performance. The ceramic hard shell structure is stable, dense and has no air gaps, and does not absorb moisture when exposed to the air for a long time. Although the phase-separated insulation layer 220 of the cable has been burned, the phase-separated fireproof layer 210 still has good insulation performance, and the cable can still be safely and reliably powered on and operated.

[0032] The phase-separated insulation layer 220 is composed of a main insulation inner layer 221 and a color-marked outer layer 222 from the inside out.

[0033] The phase-separated insulating layer 220 is specifically formed by extruding a cross-linked elastomeric insulating material and is produced by an extruder.

[0034] The color marking outer layer 222 is specifically formed by uniformly mixing and extruding a cross-linked elastomer insulating material and a color masterbatch, and is produced by an extrusion auxiliary machine.

[0035] In addition, the insulation thickness of the phase-separated insulation layer 220 is uniform, and the main insulation inner layer 221 and the color-coded outer layer 222 are combined at the extruder head and cannot be layered or separated.

[0036] The color-marked outer layer 222 mainly serves as a mark for identifying the insulated wire core. Under the premise that the color is easy to identify and uniform, the thickness of the color-marked outer layer 222 is as thin as possible.

[0037] Since the main insulating inner layer 221 adopts the natural color material of the cross-linked elastomer insulating material, the influence of the traditional full-color masterbatch on the insulating performance can be reduced.

[0038] The masterbatch used for the color identification outer layer 222 is a concentrated carrier-free masterbatch with fine particles, stable quality, not easily affected by moisture, and no fading after long-term high temperature. The addition ratio is about 0.5%. The masterbatch and the cross-linked elastomer insulation material are mixed by adding a mixer at the hopper and feed port of the extrusion auxiliary machine. The amount of masterbatch produced by the mixer can be linked and synchronized with the extrusion auxiliary machine to ensure that the extruded color identification outer layer 222 is uniform and consistent, and the waste of cross-linked elastomer insulation material is greatly reduced when changing color specifications.

[0039] In this solution, the three main insulated cores 110 are in contact with each other, and the three ground insulated cores 120 are located in the edge gaps between the three main insulated cores 110 , thus ensuring the roundness of the cable core 100 .

[0040] In addition, in order to further improve the roundness and stably protect the insulating core structure in the cable core, soft copper conductors can be filled outside the gaps of the three main insulating cores 110 and the three ground insulating cores 120 to form a soft conductive filling layer 130.

[0041] The soft conductive filling layer 130 is specifically 6 strands of soft copper conductors of the same structure, whose size matches the gap between the main insulating core 110 and the three ground insulating cores 120. The soft conductive filling layer 130 serves as the protective grounding conductor of the cable, reducing the additional filler in the cable and improving the material utilization of the cable. The soft conductive filling layer 130 will replace the concentric conductor structure, greatly improving the softness of the cable.

[0042] The outer periphery of the cable core 100 is sequentially covered with a fire insulation layer 310 and an outer protective layer 320 from the inside to the outside.

[0043] The fire barrier layer 310 is preferably formed by overlapping and wrapping glass fiber tapes. The glass fiber tapes do not contain adhesives, have good high temperature resistance and low heat release, and can still play a good fire and heat insulation role after long-term burning. It can slow down the temperature transfer to the interior of the cable core 100 and reduce the extent of flame burning into the cable core, thereby preventing the fire from spreading.

[0044] The outer layer 320 is preferably made of a halogen-free low-smoke polyolefin elastomer flame retardant sheath material extruded on the fire insulation layer 310. It has a good oxygen index, small heat release, good crusting, good flame retardancy, good mechanical and physical properties, and can well protect the cable core 100 from damage.

[0045] The flame-retardant and fireproof low-voltage soft power cable formed by the above scheme has a small outer diameter, light weight, good flame retardancy, fire resistance, high flexibility and reliability, so it has a long service life and meets environmental requirements.

[0046] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A highly flexible flame-retardant and fire-resistant low-voltage soft power cable, characterized by: It comprises a cable core; the outer periphery of the cable core is sequentially coated with a fire-proof layer and an outer coating from the inside to the outside; the cable core comprises three main insulating cores and three ground insulating cores; the cable core further comprises a soft conductive filling layer around the insulating core; each main insulating core or ground insulating core comprises a conductor, and the outer periphery of the conductor is sequentially coated with a phase-separated fire-proof layer and a phase-separated insulating layer from the inside to the outside.

2. The flame-retardant and fire-proof low-voltage flexible power cable according to claim 1, characterized in that: The three main insulated wire cores are in contact with each other, and the three ground insulated wire cores are located in edge gaps between the three main insulated wire cores.

3. The highly flexible flame-retardant and fire-resistant low-voltage soft power cable according to claim 1, characterized in that: The conductor is a soft copper conductor.

4. The highly flexible flame-retardant and fire-resistant low-voltage soft power cable according to claim 1, characterized in that: The phase-separated fireproof layer is formed by overlapping and wrapping ceramic mica tapes.

5. The highly flexible flame-retardant and fire-resistant low-voltage soft power cable according to claim 1, characterized in that: The phase-separated insulation layer consists of a main insulation inner layer and a color-marked outer layer. The main insulation inner layer is the main body of the phase-separated insulation layer; the color-marked outer layer is the surface thin layer of the phase-separated insulation layer.

6. The highly flexible flame-retardant and fire-resistant low-voltage soft power cable according to claim 1, characterized in that: The soft conductive filling layer is filled with soft copper conductor.

7. The highly flexible flame-retardant and fire-resistant low-voltage soft power cable according to claim 1, characterized in that: The fire insulation layer is formed by overlapping and wrapping glass fiber tapes.

8. The highly flexible flame-retardant and fire-resistant low-voltage soft power cable according to claim 1, characterized in that: The outer protective layer is an extruded halogen-free low-smoke polyolefin elastomer flame retardant outer sheath.

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