High-flame-retardant waterproof environment-friendly low-voltage power cable

Abstract

The utility model discloses a high-flame-retardant waterproof environment-friendly low-voltage power cable, which comprises a cable core, and the periphery of the cable core is sequentially coated with an isolating layer, a cooling flame-retardant layer, a heat-insulating protective layer and an outer coating layer from inside to outside. The cable core comprises a filling frame and a plurality of insulated wire cores, the plurality of insulated wire cores are distributed along the circumference and are stranded, and the filling frame is filled in the area among the plurality of insulated wire cores and is respectively contacted with each insulated wire core. Compared with the prior art, the high-flame-retardant waterproof environment-friendly low-voltage power cable provided by the utility model has better flame retardance, waterproof performance and environment-friendly performance.

Description

Technical Field

[0001] The utility model relates to a power cable, in particular to a highly flame-retardant, waterproof and environmentally friendly low-voltage power cable. Background Art

[0002] At present, the flame retardant structure of non-metallic sheathed low-voltage high flame retardant waterproof cable is set outside the cable core. There are three main types of flame retardant structures:

[0003] The first type is a comprehensive flame retardant layer outside the cable core consisting of an inner fire barrier layer + an oxygen barrier layer + an outer fire barrier layer + an outer sheath. The fire wall structure consisting of an inner fire barrier layer + an oxygen barrier layer + an outer fire barrier layer has good flame retardant properties, and its oxygen barrier layer is a halogen-free low-smoke polyolefin oxygen barrier material.

[0004] The second type is a fire-proof layer + outer sheath outside the cable core. Since there is no oxygen-proof layer structure, the fire-proof layer and the outer sheath are appropriately thickened, and the outer sheath is required to have low heat release during combustion, good crusting properties, and not easy to drip.

[0005] The third type is composed of oxygen insulation layer + fire insulation layer + outer sheath outside the cable core. The cable core has no filling and wrapping structure, and its insulating core is not fixed. Its oxygen insulation layer is fireproof mud, which has a certain adhesion to the insulating core of the cable core. When the cable is bent or heated, there is a large friction between the insulating core of the cable and the oxygen insulation layer, which affects the slippage of the insulating core.

[0006] The first structure has more production process flows, and compared with the second structure, it has two more processes: oxygen isolation layer + external fire isolation layer. The production cycle is longer and the processing labor cost is higher.

[0007] In the second structure, since the outer sheath itself plays the main flame retardant role, the improvement of its flame retardant performance makes the material consumption and unit price of the outer sheath structure higher, and the product competitiveness is poor.

[0008] The third structure has poor bending and high and low temperature environment resistance, so its applicable occasions are subject to certain restrictions.

[0009] From the above description, it can be seen that at present, it is urgent to maintain the high flame retardancy of highly flame retardant, waterproof and environmentally friendly low-voltage power cables and reduce their manufacturing costs. Summary of the Invention

[0010] In order to solve the above problems, the utility model provides a highly flame-retardant, waterproof and environmentally friendly low-voltage power cable.

[0011] In order to achieve the above-mentioned purpose, the technical solution of the present utility model is as follows:

[0012] A highly flame-retardant, waterproof and environmentally friendly low-voltage power cable, comprising a cable core, the outer periphery of which is sequentially coated with an isolation layer, a temperature-reducing flame-retardant layer, a fire-insulating layer and an outer sheath from the inside out;

[0013] The cable core comprises a filling frame and a plurality of insulating cores, wherein the plurality of insulating cores are distributed along the circumference and twisted together, and the filling frame fills the area between the plurality of insulating cores and contacts each insulating core respectively.

[0014] In the above-mentioned highly flame-retardant, waterproof and environmentally friendly low-voltage power cable, the filling frame is a halogen-free, low-smoke elastic circular filling strip, and the circular filling strip is in tangential contact with the insulated core.

[0015] In the above-mentioned highly flame-retardant, waterproof and environmentally friendly low-voltage power cable, the insulating core includes a conductor, and the outer periphery of the conductor is covered with an insulating layer.

[0016] In the above-mentioned highly flame-retardant, waterproof and environmentally friendly low-voltage power cable, the insulating layer can be formed by plastic extrusion, or by overlapping and wrapping insulating tapes, or by a composite structure of insulating tape + plastic extrusion.

[0017] In the above-mentioned highly flame-retardant, waterproof and environmentally friendly low-voltage power cable, the insulating tape can be a polyester tape, a mica tape or a combination of the two.

[0018] In the above-mentioned highly flame-retardant, waterproof and environmentally friendly low-voltage power cable, the insulating layer can be formed by tightly extruding insulating material on the conductor, or by overlapping insulating tape wrapped around the conductor.

[0019] In the above-mentioned highly flame-retardant, waterproof and environmentally friendly low-voltage power cable, the isolation layer is formed by wrapping a heat shrinkable tape on the cable core.

[0020] In the above-mentioned highly flame-retardant, waterproof and environmentally friendly low-voltage power cable, the heat shrinkable tape coating is formed by overlapping or longitudinally wrapping the heat shrinkable tape on the cable core, shrinking it after passing through a heating device and tightly adhering to the surface of the insulating core of the cable core, and the heat shrinkable tapes are adhered to each other.

[0021] In the above-mentioned highly flame-retardant, waterproof and environmentally friendly low-voltage power cable, the temperature-reducing flame-retardant layer is formed by extruding fire-retardant mud on the isolation layer, and the fire-retardant mud is filled to the surface of the isolation layer.

[0022] In the above-mentioned highly flame-retardant, waterproof and environmentally friendly low-voltage power cable, the fire insulation layer is composed of overlapping and wrapped fire insulation protection belts.

[0023] In the above-mentioned highly flame-retardant, waterproof and environmentally friendly low-voltage power cable, the fire isolation tape can be one of glass fiber tape, highly flame-retardant tape and mica tape, or a combination of two of them.

[0024] In the above-mentioned highly flame-retardant, waterproof and environmentally friendly low-voltage power cable, the outer sheath is formed by tightly extruding a halogen-free, low-smoke polyolefin flame-retardant sheath material on the fire-insulating layer.

[0025] The beneficial effects of the utility model are:

[0026] Compared with the existing technology, the highly flame-retardant, waterproof and environmentally friendly low-voltage power cable provided by the utility model has better flame retardancy, waterproofness and environmental protection performance, better structural stability, lower production cost than the same type of cables, and is easy to process and produce. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0028] Figure 1 This is a structural schematic diagram of the highly flame-retardant, waterproof and environmentally friendly low-voltage power cable provided by the utility model. DETAILED DESCRIPTION

[0029] 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.

[0030] See also Figure 1 , which shows an example of the internal structure of the highly flame-retardant, waterproof and environmentally friendly low-voltage power cable provided by the present invention.

[0031] As can be seen from the figure, the highly flame-retardant, waterproof and environmentally friendly low-voltage power cable mainly comprises a cable core 300 and an isolation layer 400, a temperature-reducing flame-retardant layer 500, a fire-insulating layer 600 and an outer sheath 700.

[0032] Specifically, in this embodiment, the outer periphery of the cable core 300 is preferably coated with an isolation layer 400, a temperature-reducing flame-retardant layer 500, a fire-isolating layer 600, and an outer layer 700 in sequence from the inside to the outside, thereby forming a highly flame-retardant, waterproof, and environmentally friendly low-voltage power cable.

[0033] In some specific implementations, the cable core 300 in this example is composed of a filling frame 200 and a plurality of insulating cores 100 .

[0034] The insulated wire cores 100 here may be of the same specification or of different specifications.

[0035] In this way, several insulating cores 100 are distributed and twisted along the same circumference, and the filling frame 200 is set in the area between the several insulating cores 100, that is, the center position of the cable core 300, and contacts each insulating core 100 respectively, thereby forming a corresponding cable core 300.

[0036] In some specific embodiments, the filling frame 200 in this example is preferably a circular filling bar, which is in tangential contact with the insulated wire core.

[0037] Furthermore, the filling frame 200 in this example is extruded from a halogen-free, low-smoke elastomer material, which makes it elastic and can reduce the force between the insulating cores 100. In addition, it fixes the position of the insulating cores 100 and will not become loose even when there is no protective tape tied around the cable core, and the structure remains stable.

[0038] In some specific embodiments, the insulated wire core 100 in this example includes a conductor 110 and an insulation layer 120 covering the conductor 110 .

[0039] In some specific embodiments, the conductor 110 in this example can be a first type solid copper conductor, a second type stranded copper conductor, a fifth type soft copper conductor, a sixth type soft copper conductor, a fifth type tinned soft copper conductor, or a sixth type tinned soft copper conductor.

[0040] In some specific implementations, the insulating layer 120 in this example may be formed by extruded plastic, or by overlapping and wrapping insulating tapes, or may be a composite structure of insulating tapes and extruded plastic.

[0041] Specifically, the plastic of the insulating layer 120 is halogen-free and low-smoke, and can be cross-linked polyethylene insulation material, polypropylene insulation material, or polyolefin insulation material. The plastic insulation is a plastic sheath with good waterproof performance and good insulation performance during normal use.

[0042] Specifically, the insulating tape of the insulating layer 120 is halogen-free and low-smoke, and can be made of one or a combination of polyester tape and mica tape.

[0043] In some specific embodiments, the isolation layer 400 in this example is formed by wrapping a heat shrink tape around the cable core.

[0044] Specifically, the heat shrinkable tape coating is performed by overlapping or longitudinally wrapping the heat shrinkable tape around the cable core 300, shrinking it after passing through a heating device and tightly adhering to the surface of the insulating core 100 of the cable core 300, and the heat shrinkable tapes are adhered to each other. Such materials and processes make the isolation layer 400 a sealed annular structure with a waterproof effect. In addition, the isolation layer 100 can effectively fix the insulating core 100 of the cable core 300, so that the insulating core 100 of the cable core 300 will not become loose during subsequent production.

[0045] Furthermore, the isolation layer 400 separates the cable core 300 from the cooling and flame retardant layer, reducing the force of the cooling and flame retardant layer 500 on the cable core 300, so that the insulating core 100 of the cable core 300 can slide smoothly in bending and high and low temperature resistant environments.

[0046] In some specific embodiments, the cooling and flame-retardant layer 500 in this example is formed by extruding fire-retardant mud onto the isolation layer 400. The fire-retardant mud is filled onto the surface of the isolation layer 400 and does not adhere to the insulating core. Since the inner surface of the fire-retardant mud is an embedded structure, the fire-retardant mud structure is stable and has little deformation. The cooling and flame-retardant layer 500 formed by the fire-retardant mud with such a structure mainly constitutes the rounded filling portion of the cable core 400, while the thickness outside the cable core 400 is very thin. When the cable is bent, the insulating core 100 of the cable and the cooling and flame-retardant layer 500 are mainly subjected to the force as a whole. The cooling and flame-retardant layer 500 structure configured in this way will not make the cable as a whole harder or affect the bending performance of the cable.

[0047] Furthermore, the fireproof mud in this example is made of a mixture of liquid sodium silicate and inorganic mineral powder. The inorganic mineral powder can be a mixture of one or two of magnesium hydroxide or aluminum hydroxide. This structure can precipitate moisture when the cable burns, which has a significant effect on cooling the cable core 300. Since the main component of this structure is inorganic minerals, it has a certain resistance to mechanical external forces and can effectively protect the insulating layer 120 of the insulated core 100 from being damaged. After the cable is burned, the structure becomes a hard shell, which can effectively protect the fireproof insulating layer 120 from being damaged by external forces and has good flame retardant, heat insulation, fireproof and water-proof effects.

[0048] In some specific embodiments, the fire insulation layer 600 in this example is composed of overlapping and wrapped fire insulation belts.

[0049] The fire protection tape here can be a combination of one or two of glass fiber tape, high flame retardant tape and mica tape.

[0050] The fire-insulating layer 600 formed in this way can slow down the transfer of external heat to the cooling and flame-retardant layer 500 when burning, and can effectively ensure the formation of a hard shell of the cooling and flame-retardant layer 500 and protect the cooling and flame-retardant layer 500 from being damaged.

[0051] In some specific embodiments, the outer sheath 700 in this example is the outermost protective layer of the cable, and is specifically made of a halogen-free, low-smoke, flame-retardant polyolefin sheath material tightly extruded onto the fire-insulating protective layer 600 .

[0052] In the highly flame-retardant, waterproof and environmentally friendly low-voltage power cable formed in this example, the non-metallic materials used in the insulation layer 120, filling frame 200, isolation sleeve 400, cooling and flame-retardant layer 500, fire isolation layer 600 and outer layer 700 are all halogen-free and low-smoke materials, which also makes this application have better environmental performance.

[0053] In the highly flame-retardant, waterproof and environmentally friendly low-voltage power cable formed in this example, the cooling flame-retardant layer 500, the fire-isolating layer 600 and the outer layer 700 used are all made of highly flame-retardant materials, which makes the cable have good flame-retardant properties.

[0054] In the highly flame-retardant, waterproof and environmentally friendly low-voltage power cable formed in this example, no filler is used to fill the outer periphery of the insulating core 100 of the cable core 300. Instead, an isolation layer 400 is tightly wrapped and a cooling flame-retardant layer 500 is extruded and filled, which fully exerts the cooling and water-blocking effects and effectively reduces the outer diameter and weight of the cable.

[0055] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in this invention is defined by the appended claims and their equivalents.

Claims

1. A highly flame-retardant, waterproof and environmentally friendly low-voltage power cable, characterized by: The cable comprises a cable core, the outer periphery of which is sequentially coated with an isolation layer, a temperature-reducing and flame-retardant layer, a fire-insulating layer and an outer sheath from the inside out; The cable core includes a filling frame and a plurality of insulated cores, wherein the plurality of insulated cores are distributed along a circumference and twisted together, and the filling frame fills the area between the plurality of insulated cores and contacts each of the insulated cores respectively; The filling frame is a halogen-free low-smoke elastomer circular filling strip, which is in tangential contact with the insulated wire core; the isolation layer is formed by a heat shrinkable tape wrapped on the cable core; the cooling and flame-retardant layer is composed of fireproof mud extruded on the isolation layer, and the fireproof mud is filled to the surface of the isolation layer.

2. The highly flame-retardant, waterproof and environmentally friendly low-voltage power cable according to claim 1, characterized in that: The insulated wire core comprises a conductor, and the outer periphery of the conductor is covered with an insulating layer.

3. The highly flame-retardant, waterproof and environmentally friendly low-voltage power cable according to claim 1, characterized in that: The fire insulation layer is composed of overlapping and wrapped fire insulation protection belts.

4. The highly flame-retardant, waterproof and environmentally friendly low-voltage power cable according to claim 1, characterized in that: The outer layer is formed by tightly wrapping and extruding a halogen-free low-smoke polyolefin flame-retardant sheath material on the fire-insulating layer.

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