Low-smoke halogen-free flame-retardant fireproof power cable

Abstract

The utility model discloses a low-smoke halogen-free flame-retardant fireproof power cable, which comprises a cable core, the cable core comprises a plurality of conductors, each conductor comprises a copper core wire, a mica tape wrapping layer wrapped on the copper core wire, a fireproof insulating layer extruded on the mica tape wrapping layer and a flame-retardant layer extruded on the fireproof insulating layer, a tensile reinforcing rope is arranged in the center of the plurality of conductors, and the plurality of conductors and the tensile reinforcing rope are twisted to form a cable core; a wrapping tape layer is wrapped outside the cable core, a polyester tape layer is wrapped on the wrapping tape layer, a braided shielding layer is arranged on the polyester tape layer, an outer sheath layer is extruded on the braided shielding layer, and a filling layer is arranged in the wrapping tape layer. The power cable provided by the utility model is made of halogen-free materials, has good flame-retardant fireproof performance and tensile performance on the premise of meeting the halogen-free, low-smoke and non-toxic characteristics so as to meet the use requirements, and is simple in overall structure, reasonable in design and worthy of popularization and use.

Description

Technical Field

[0001] The utility model relates to the technical field of power cables, and specifically relates to a low-smoke, halogen-free, flame-retardant and fire-resistant power cable. Background Art

[0002] As an important supporting industry for the national economy, with the rapid development of the national economy, the application of control cables is becoming more and more extensive. As a wire for transmitting and distributing electric energy, power cables have been widely used in various fields at present. It is an indispensable important transmission medium in industrial and civil aspects. With the development of technology and the change of the market, the demand for power cables is also growing rapidly.

[0003] A low-smoke, halogen-free cable refers to a cable whose insulating layer material does not contain halogen substances. In the case of combustion, it does not release halogen-containing gases and has a low smoke concentration. During daily use, low-smoke, halogen-free cables are often affected by the external environment, such as an open fire. Since the cable outer sheath is combustible, the entire cable core will be exposed after combustion, resulting in the cable being unable to continue to be used. For traditional PVC (polyvinyl chloride) wires, when a fire occurs, the PVC mixture is easily decomposed upon heating to release a large amount of highly toxic and corrosive HCL (hydrogen chloride) gas and generate a large amount of highly toxic thick smoke, causing major life and property losses and bringing great difficulties to rescue work.

[0004] After retrieval, the patent document with the authorization announcement number CN218866752U discloses a cross-linked polyethylene insulated low-smoke, halogen-free, flame-retardant and fire-resistant power cable, and the patent document with the authorization announcement number CN219180254U discloses a low-smoke, halogen-free, flame-retardant and fire-resistant wire and cable. From the content disclosed in the two retrieved patent documents, a cable that meets the use requirements is provided from different angles. With the rapid growth of supporting cable products for existing industrial automation requirements, a large number of cables are needed. In order to enhance the competitiveness of enterprises, meet market demands, and increase market share, a cable different from the ones disclosed in the prior art is provided to meet the use requirements. Content of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide a power cable with stable performance in view of the problems in the background art. The power cable is made of halogen-free materials, and the amount of smoke released during cable combustion is very small. It does not produce thick acid mist. On the premise of meeting the characteristics of being halogen-free, low-smoke and non-toxic, it also has good flame-retardant and fire-resistant properties and tensile properties to meet the use requirements. Specifically, it is a low-smoke, halogen-free, flame-retardant and fire-resistant power cable.

[0006] To solve the above technical problems, the technical solution adopted by the present utility model is as follows: A low-smoke, halogen-free, flame-retardant and fire-resistant power cable, comprising a cable core. The cable core includes a plurality of conductors. Each conductor includes a copper core wire and a mica tape wrapping layer wrapped around the copper core wire, a fire-resistant insulation layer extruded on the mica tape wrapping layer, and a flame-retardant layer extruded on the fire-resistant insulation layer. A tensile strengthening rope is arranged at the center of the plurality of conductors, and the plurality of conductors and the tensile strengthening rope are stranded to form the cable core; A tape layer is wrapped around the cable core, and a polyester tape layer is wrapped around the tape layer. A braided shielding layer is provided on the polyester tape layer, an outer sheath layer is extruded on the braided shielding layer, and a filling layer is provided in the tape layer.

[0007] Further, for a low-smoke, halogen-free, flame-retardant and fire-resistant power cable according to the present utility model, there are six conductors, and the six conductors are arranged in a ring outside the tensile strengthening rope. Among them, the copper core wire is stranded by a number of No. 5 copper conductors specified in GB / T 3956-2008, the mica tape wrapping layer is a double-layer mica tape overlapping wrapping layer, the fire-resistant insulation layer is extruded with ethylene propylene diene monomer rubber, and the flame-retardant layer is extruded with a low-smoke, halogen-free and flame-retardant polyolefin insulating material.

[0008] Further, for a low-smoke, halogen-free, flame-retardant and fire-resistant power cable according to the present utility model, the tensile strengthening rope is wound with an aromatic polyamide fiber material.

[0009] Further, for a low-smoke, halogen-free, flame-retardant and fire-resistant power cable according to the present utility model, the filling layer includes a silicon carbide fiber fabric layer, artificial mica particles filled in the silicon carbide fiber fabric layer, and an alumina fiber fabric layer wrapped outside the silicon carbide fiber fabric layer, and the alumina fiber fabric layer adopts a double-layer structure.

[0010] Further, for a low-smoke, halogen-free, flame-retardant and fire-resistant power cable according to the present utility model, the tape layer is wrapped with a halogen-free glass fiber tape.

[0011] Further, for a low-smoke, halogen-free, flame-retardant and fire-resistant power cable according to the present utility model, the polyester tape layer is formed by overlapping and wrapping two layers of polyester tape.

[0012] Further, for a low-smoke, halogen-free, flame-retardant and fire-resistant power cable according to the present utility model, the braided shielding layer is formed by helically wrapping two layers of copper tape.

[0013] Further, for a low-smoke, halogen-free, flame-retardant and fire-resistant power cable according to the present utility model, the outer sheath layer is extruded with a wear-resistant, halogen-free, low-smoke and flame-retardant polyolefin.

[0014] Adopting a low-smoke, halogen-free, flame-retardant and fire-resistant power cable according to the present utility model, since the conductor includes a copper core wire, and a mica tape wrapping layer, a fire-resistant insulating layer and a flame-retardant layer provided on the copper core wire, a tensile reinforcing rope is arranged at the center of multiple conductors, and a tape layer, a polyester tape layer, a braided shielding layer and an outer sheath layer are provided outside the cable core, and a filling layer is provided inside the tape layer. By adopting the above structure, in addition to meeting the characteristics of low-smoke, halogen-free and flame-retardant cables, it can also improve its tensile capacity and avoid the problem of cable breakage caused by excessive bending times during the stranding and use of the cable.

[0015] It can be seen that the power cable according to the present utility model is made of halogen-free materials. In the event of a fire accident, it can block and delay the spread and extension of the flame along the wire and cable, reduce the expansion of the wire and cable fire range, and the amount of smoke released during the combustion of the cable is very small. It will not produce thick acid mist. On the premise of meeting the halogen-free, low-smoke and non-toxic characteristics, it also has good flame-retardant and fire-proof performance and tensile performance to meet the use requirements. Its overall structure is simple and reasonable in design, and it is worthy of popularization and use. Brief Description of the Drawings

[0016] The present utility model will be further described in detail below with reference to the drawings.

[0017] Figure 1 is a schematic structural diagram of the present utility model.

[0018] As shown in the figure: 1 - conductor, 11 - copper core wire, 12 - mica tape wrapping layer, 13 - fire-resistant insulating layer, 14 - flame-retardant layer, 2 - tensile reinforcing rope, 3 - filling layer, 31 - artificial mica particles, 32 - silicon carbide fiber fabric layer, 33 - alumina fiber fabric layer, 4 - tape layer, 5 - polyester tape layer, 6 - braided shielding layer, 7 - outer sheath layer. Detailed Embodiment

[0019] The following specific embodiments illustrate the implementation manners of the present utility model. Those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification.

[0020] It should be noted that the structures, proportions, sizes, etc. shown in the attached drawings of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the conditions for the implementation of this utility model. Therefore, they do not have substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the efficacy that this utility model can produce and the purpose that can be achieved, should still fall within the scope covered by the technical content disclosed in this utility model. At the same time, the terms such as "upper", "lower", "left", "right", etc. cited in this specification are only for the convenience of description and are not used to limit the scope for the implementation of this utility model. The change or adjustment of their relative relationship, without substantial change in the technical content, should also be regarded as the scope within which this utility model can be implemented.

[0021] In the description of this utility model, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "provided with" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0022] It should be noted that the term "including" or any other variant is intended to cover non-exclusive inclusion, so that a process, method, article, or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such a process, method, article, or device.

[0023] As Figure 1 shown, a low-smoke, halogen-free, flame-retardant and fire-resistant power cable described in this utility model includes a cable core. The cable core includes a plurality of conductors 1. Each conductor 1 includes a copper core wire 11, a mica tape wrapping layer 12 wrapped around the copper core wire 11, a fire-resistant insulation layer 13 extruded on the mica tape wrapping layer 12, and a flame-retardant layer 14 extruded on the fire-resistant insulation layer 13. A tensile strengthening rope 2 is arranged at the center of the plurality of conductors 1, and the plurality of conductors 1 and the tensile strengthening rope 2 are stranded to form the cable core; a tape wrapping layer 4 is wrapped around the cable core, a polyester tape layer 5 is wrapped on the tape wrapping layer 4, a braided shielding layer 6 is provided on the polyester tape layer 5, an outer sheath layer 7 is extruded on the braided shielding layer 6, and a filling layer 3 is provided in the tape wrapping layer 4.

[0024] Adopting a low-smoke, halogen-free, flame-retardant and fire-resistant power cable described in the present utility model, during the specific manufacturing process, there are six conductors 1, and the six conductors 1 are arranged in a ring outside the tensile reinforcing rope 2. Among them, the copper core wire 11 is stranded by a number of the 5th type of copper conductor specified in GB / T 3956-2008, the mica tape wrapping layer 12 is a double-layer mica tape overlapping wrapping layer, the fire-resistant insulation layer 13 is extruded with ethylene propylene diene monomer rubber, and the flame-retardant layer 14 is extruded with a low-smoke, halogen-free, flame-retardant polyolefin insulating material; the tensile reinforcing rope 2 is wound with an aromatic amide fiber material; the filling layer 3 includes a silicon carbide fiber fabric layer 32, artificial mica particles 31 filled in the silicon carbide fiber fabric layer 32, and an alumina fiber fabric layer 33 wrapped outside the silicon carbide fiber fabric layer 32, and the alumina fiber fabric layer 33 adopts a double-layer structure; the tape wrapping layer 4 is wrapped with a halogen-free glass fiber tape; the polyester tape layer 5 is formed by overlapping and wrapping two layers of polyester tape; the braided shielding layer 6 is formed by helically wrapping two layers of copper tape; the outer sheath layer 7 is extruded with a wear-resistant, halogen-free, low-smoke and flame-retardant polyolefin.

[0025] Adopting a low-smoke, halogen-free, flame-retardant and fire-resistant power cable described in the present utility model, since there is a tensile reinforcing rope 2 between the conductors 1, by using the tensile reinforcing rope 2, it is avoided that the cable breaks due to excessive bending times during the cabling and use processes, thereby affecting the product performance, and its tensile capacity is greatly improved. Aromatic amide is also called aramid. Using an aromatic amide fiber material as the tensile reinforcing rope 2 and winding the aromatic amide fiber material can improve the tensile strength of the conductor 1, effectively preventing the conductor 1 from breaking due to excessive bending times during the cabling process, thereby affecting the product performance, and thus greatly improving its tensile capacity. At the same time, since the copper core wire 11 in the conductor 1 is stranded by a number of the 5th type of copper conductor specified in GB / T 3956-2008, due to the good electrical conductivity of the copper conductor, electric power can be transmitted over a longer distance, and the softness and ductility of the copper conductor are very high, and it has good heat conduction performance. Using the conductor 1 stranded by the 5th type of copper conductor can ensure the electrical and mechanical properties of the cable.

[0026] In addition, since a mica tape wrapping layer 12 is formed by overlapping and wrapping a double layer of mica tape on the copper core wire 11, and the mica tape is a double-sided synthetic mica tape, with synthetic mica paper as the base material, fiberglass cloth as the double-sided reinforcing material, and bonded with silicone resin adhesive, it has excellent fire resistance and is the most ideal material for manufacturing fire-resistant wires and cables. The mica tape wrapping layer 12 is extruded with ethylene propylene diene monomer rubber to form a fire-resistant insulation layer 13, and a flame-retardant layer 14 is extruded with a low-smoke and halogen-free flame-retardant polyolefin insulating material on the fire-resistant insulation layer 13, so as to enhance its insulation and flame-retardant properties. And outside the insulated cable core, there are successively provided a tape layer 4, a polyester tape layer 5, a braided shielding layer 6 and an outer sheath layer 7, and a filling layer 3 is provided in the tape layer 4, which can play a very good role in flame retardancy, fire resistance, fire prevention and fire separation. In the event of a fire accident, it can block and delay the spread and extension of the flame along the wires and cables, reduce the expansion of the fire range of the wires and cables, and has the characteristics of self-extinguishing after catching fire and the advantages of low toxicity and low smoke. The product can maintain normal operation for a certain period of time under the condition that the external flame is still burning, maintain the integrity of the wire and cable line and keep the normal operation of the line equipment, effectively reduce the losses caused by fire accidents, and ensure the safety of personnel's lives.

[0027] It can be seen that the power cable provided by the present utility model is made of halogen-free materials. In addition to meeting the characteristics of low-smoke and halogen-free flame-retardant cables, it can also improve its tensile strength and avoid the problem of cable breakage caused by excessive bending times during cabling and use. When a fire occurs, the spread speed is slow, the smoke concentration is low, the visibility is high, and the release amount of harmful gases is small, which is convenient for personnel evacuation. The corrosivity of the combustion gas is small, which also avoids damage to instruments and equipment. The characteristics of low halogen and halogen-free make the cable material greatly improved in terms of aging resistance, ultraviolet resistance and other irradiation resistance, thus extending the service life of the cable. It is particularly suitable for high-rise buildings, hotels, hospitals, subways, nuclear power plants, tunnels, power plants, mines, petroleum and chemical industries and other fields. In addition to meeting the characteristics of low-smoke and halogen-free flame-retardant cables, it can also meet the power supply capacity of the line under fire conditions. It is mainly used in fire alarm, fire fighting equipment and smoke exhaust equipment, as well as the power supply lines of emergency facilities such as emergency passage transportation and lighting that require fire resistance.

[0028] To sum up, the power cable described in the present utility model is made of halogen-free materials. In the event of a fire accident, it can block and delay the spread and extension of the flame along the wires and cables, reduce the expansion of the fire range of the wires and cables, and when the cable burns, the amount of smoke released is very small, and it will not produce thick acid mist. On the premise of meeting the characteristics of halogen-free, low-smoke and non-toxic, it also has good flame-retardant and fire-proof performance and tensile performance to meet the use requirements. Its overall structure is simple and the design is reasonable, and it is worthy of popularization and use.

[0029] Other details not elaborated in this utility model are all well-known conventional technologies to those skilled in the art.

[0030] The protection scope of this utility model is not limited to the technical solutions disclosed in the specific embodiments. The above are only the preferred embodiments of this utility model and do not limit this utility model. Any minor modifications, equivalent replacements, and improvements made according to the technical solutions of this utility model shall be included within the protection scope of the technical solutions of this utility model.

Claims

1. A low-smoke, halogen-free, flame-retardant and fire-resistant power cable, comprising a cable core, the cable core including a plurality of conductors (1), characterized in that: The conductor (1) includes a copper core wire (11), a mica tape wrapping layer (12) wrapped around the copper core wire (11), a fire-resistant insulation layer (13) extruded on the mica tape wrapping layer (12), and a flame-retardant layer (14) extruded on the fire-resistant insulation layer (13). A tensile strengthening rope (2) is arranged at the center of a plurality of conductors (1), and the plurality of conductors (1) and the tensile strengthening rope (2) are stranded to form a cable core; a tape wrapping layer (4) is wrapped around the cable core, a polyester tape layer (5) is wrapped around the tape wrapping layer (4), a braided shielding layer (6) is provided on the polyester tape layer (5), an outer sheath layer (7) is extruded on the braided shielding layer (6), and a filling layer (3) is provided in the tape wrapping layer (4); Among them, there are six conductors (1), and the six conductors (1) are arranged in a ring outside the tensile strengthening rope (2). Among them, the copper core wire (11) is stranded by a number of No. 5 copper conductors specified in GB / T 3956-2008, the mica tape wrapping layer (12) is a double-layer mica tape overlapping wrapping layer, the fire-resistant insulation layer (13) is extruded with ethylene propylene diene monomer rubber, and the flame-retardant layer (14) is extruded with a low-smoke and halogen-free flame-retardant polyolefin insulating material; the tensile strengthening rope (2) is wound with an aromatic polyamide fiber material; The filling layer (3) includes a silicon carbide fiber fabric layer (32), artificial mica particles (31) filled in the silicon carbide fiber fabric layer (32), and an alumina fiber fabric layer (33) wrapped outside the silicon carbide fiber fabric layer (32), and the alumina fiber fabric layer (33) adopts a double-layer structure; The tape wrapping layer (4) is wrapped with a halogen-free glass fiber tape; the polyester tape layer (5) is a double-layer polyester tape overlapping wrapping; the braided shielding layer (6) is formed by helically wrapping two layers of copper tape; the outer sheath layer (7) is extruded with a wear-resistant halogen-free low-smoke flame-retardant polyolefin.

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