Cable

Abstract

The utility model provides a cable, and belongs to the technical field of fireproof cables. The cable comprises a cable core, a fireproof layer and a protective layer. The cable core comprises a plurality of insulated wire cores which are mutually twisted. The fireproof layer comprises a woven mesh belt and mixed mineral substances, the woven mesh belt wraps the peripheral side of the cable core, the woven mesh belt and the cable core define a filling space, the woven mesh belt is provided with a plurality of mesh belt holes, the mesh belt holes are communicated with the filling space, the mixed mineral substances are configured to be capable of blocking flames, and part of the mixed mineral substances are arranged in the filling space and the mesh belt holes. And the other part of the mixed mineral substance surrounds the peripheral side of the woven mesh belt. And the protective layer surrounds the peripheral side of the fireproof layer, and the protective layer is configured to be capable of tightening and protecting the fireproof layer. The fireproof performance of the cable provided by the utility model can be improved.

Description

Technical Field

[0001] This utility model relates to the field of fireproof cable technology, and in particular to a cable. Background Technology

[0002] The increasing demand for electrical safety in modern society means that electrical safety is closely related to people's lives. Especially in high-rise buildings, public facilities, and industrial sectors, where strict fire prevention and control requirements exist, fire-resistant safety products are the primary requirement for cable safety.

[0003] The insulation and sheathing materials of ordinary cables are easily flammable under high temperatures or open flames, releasing toxic fumes and corrosive gases. In a fire, cables can become channels for the spread of fire, or even cause short circuits, exacerbating the disaster. Especially with the proliferation of high-rise buildings, subways, tunnels, and other densely populated areas, where escape is difficult, higher demands are placed on the fire resistance performance of cables. Utility Model Content

[0004] This utility model provides a cable, the purpose of which is to improve the fire resistance of the cable.

[0005] To achieve the above objectives, this utility model provides a cable, comprising:

[0006] The cable core consists of multiple insulated wire cores twisted together.

[0007] The fireproof layer includes a woven mesh and a mixed mineral. The woven mesh wraps around the outer periphery of the cable core, and the woven mesh and the cable core enclose a filling space. The woven mesh has a plurality of mesh holes that communicate with the filling space. The mixed mineral is configured to impede flames. A portion of the mixed mineral is disposed in the filling space and the mesh holes, and another portion of the mixed mineral surrounds the outer periphery of the woven mesh.

[0008] A protective layer surrounds the outer periphery of the fireproof layer, the protective layer being configured to secure and protect the fireproof layer.

[0009] In one embodiment, the mixed minerals include magnesium hydroxide and sodium silicate.

[0010] In one embodiment, the insulated core includes a conductor, a fire-resistant layer, and an insulating layer. The fire-resistant layer surrounds the outer periphery of the conductor, and the insulating layer surrounds the outer periphery of the fire-resistant layer. The fire-resistant layer is a mineral mica tape, and the insulating layer is cross-linked polyethylene.

[0011] In one embodiment, the protective layer includes a glass fiber wrapping tape and an outer sheath, the glass fiber wrapping tape being wrapped around the outer periphery of the fireproof layer, and the outer sheath surrounding the outer periphery of the glass fiber wrapping tape, the outer sheath being a low-smoke halogen-free flame-retardant polyolefin.

[0012] In one embodiment, the protective layer is configured to be orange.

[0013] The above-mentioned solution of this utility model has the following beneficial effects:

[0014] In this embodiment, the braided mesh is wrapped around the outer periphery of the cable core, tightly binding multiple twisted insulated cores. Simultaneously, the braided mesh and the cable core enclose a filling space. The braided mesh has multiple mesh holes that communicate with the filling space. When the mixed minerals that can impede flames are extruded and pressed onto the outer periphery of the braided mesh, some of the mixed minerals can enter the filling space through the mesh holes, reducing the possibility of oxygen within the filling space. The remaining portion can surround the outer periphery of the braided mesh. Furthermore, during the extrusion and pressing process of the mixed minerals, the braided mesh acts as a skeleton supporting the mixed minerals, allowing them to adhere more firmly to the outer periphery of the cable core. It also allows the mixed minerals to be compressed more densely into the filling space, resulting in a lower or even zero oxygen content within the filling space. This reduces the duration of flames during cable combustion and improves the cable's fire resistance. In addition, the braided mesh belt, as a supporting skeleton for the mixed minerals, helps to improve the concentricity between the mixed minerals and the cable core, thereby reducing the possibility of a decrease in the fire resistance of the cable due to the eccentricity of the fireproof layer thickness during combustion, and thus improving the fire resistance of the cable.

[0015] Other beneficial effects of this invention will be described in detail in the following detailed description section. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the cross-section of a cable in one embodiment of the present invention;

[0017] Figure 2 This is a schematic diagram of the woven mesh belt in one embodiment of the present invention.

[0018] [Explanation of Labels in the Attached Image]

[0019] 1. Cable core; 11. Insulated core; 111. Conductor; 112. Fire-resistant layer; 113. Insulation layer; 2. Fireproof layer; 21. Braided mesh belt; 21a. Mesh belt holes; 21b. Filling space; 22. Mixed minerals; 3. Protective layer; 31. Fiberglass wrapping tape; 32. Outer sheath. Detailed Implementation

[0020] To make the technical problems, solutions, and advantages of this utility model clearer, a detailed description will be provided below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model. Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0021] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a locking connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] The cable disclosed in this application is a flexible mineral fire-resistant power cable. It is a fire-resistant cable with flexibility and mineral materials as insulation or sheath. It can be widely used in high-temperature, high-fire-resistance, and complex installation environments, such as fire pumps, emergency lighting, elevators and other critical circuits, as well as subways, airport tunnels and other applications.

[0024] Specifically, please refer to Figure 1 The cable comprises a cable core 1, a fire-resistant layer 2, and a protective layer 3. The cable core 1 comprises multiple insulated wire cores 11 twisted together. For example, the number of insulated wire cores 11 can be three to five, and these three to five insulated wire cores 11 are twisted together in a predetermined direction and pitch to form the cable core 1. The fire-resistant layer 2 comprises a braided mesh 21 and a mineral blend 22. The braided mesh 21 can be made of fiberglass, allowing the braided mesh 21 to be... Figure 2The fiberglass braided mesh tape 21 is shown. The braiding density of the mesh tape 21 can be 40%. The braided mesh tape 21 is wrapped around the outer periphery of the cable core 1 to tightly bind the multiple intertwined insulated wire cores 11. For example, the overlap rate of the fiberglass braided mesh tape 21 in the wrapping direction is not less than 20%. Because the multiple insulated wire cores 11 are intertwined, the outer periphery of the cable core 1 is twisted. When the braided mesh tape 21 is wrapped around the outer periphery of the cable core 1, the braided mesh tape 21 and the cable core 1 enclose a filling space 21b. Please refer to [link to relevant documentation]. Figure 2 The woven mesh belt 21 has multiple mesh belt holes 21a. The mesh belt holes 21a communicate with the filling space 21b. The mixed minerals 22 are configured to impede the flame. (See also...) Figure 1 A portion of the mixed mineral 22 is disposed within the filling space 21b and the mesh belt hole 21a, while another portion of the mixed mineral 22 surrounds the outer periphery of the braided mesh belt 21. For example, the mixed mineral 22 is extruded onto the outer periphery of the braided mesh belt 21, allowing a portion of the mixed mineral 22 to enter the filling space 21b through the mesh belt hole 21a to seal the gap between the cable core 1 and the braided mesh belt 21, reducing the possibility of oxygen presence in the filling space 21b. The excess mixed mineral 22 then surrounds the outer periphery of the braided mesh belt 21. The protective layer 3 surrounds the outer periphery of the fireproof layer 2 and is configured to secure and protect the fireproof layer 2.

[0025] In this embodiment, the braided mesh 21 is wrapped around the outer periphery of the cable core 1, which can tightly bind multiple intertwined insulated cores 11. At the same time, the braided mesh 21 and the cable core 1 enclose a filling space 21b. The braided mesh 21 has multiple mesh holes 21a, which are connected to the filling space 21b. When the mixed minerals 22 that can impede flames are extruded and pressed into shape on the outer periphery of the braided mesh 21, a portion of the mixed minerals 22 can enter the filling space 21b through the mesh holes 21a to reduce the possibility of oxygen in the filling space 21b, while the other portion can surround the outer periphery of the braided mesh 21. Furthermore, during the extrusion and pressing process of the mixed minerals 22, the braided mesh 21 serves as a skeleton to support the mixed minerals 22, allowing them to adhere more firmly to the outer periphery of the cable core 1. This also enables the mixed minerals 22 to be compactly compressed into the filling space 21b, resulting in a lower or even zero oxygen content within the filling space 21b. This reduces the duration of the flame during cable combustion, thus improving the cable's fire resistance. In addition, the braided mesh 21, as a supporting skeleton for the mixed minerals 22, helps improve the concentricity between the mixed minerals 22 and the cable core 1, reducing the possibility of a decrease in the cable's fire resistance due to uneven thickness of the fireproof layer 2 during combustion, further enhancing the cable's fire resistance.

[0026] In one embodiment, please refer to Figure 1 The mixed minerals 22 include magnesium hydroxide and sodium silicate. For example, it can be magnesium hydroxide powder and a sodium silicate solution, the sodium silicate solution being viscous and binding the magnesium hydroxide powder into a mud-like consistency. The recommended mixing ratio of magnesium hydroxide powder and sodium silicate solution is in the range of 1:0.7 to 1:0.8.

[0027] It should be noted that if the magnesium hydroxide powder content is high, the sodium silicate solution cannot bind the magnesium hydroxide powder into a mud-like substance, which easily leads to the mixed mineral 22 being extruded and pressed into a powdery state, resulting in incomplete extrusion and insufficient density of the mixed mineral 22. If the sodium silicate solution content is high, the mud-like substance formed by the mixture of magnesium hydroxide powder and sodium silicate solution is relatively sparse, which easily leads to the mixed mineral 22 being extruded and pressed into a solid state, resulting in insufficient density and easily reducing the fire resistance of the mixed mineral 22.

[0028] For example, the mixing ratio of magnesium hydroxide powder and sodium silicate solution can be 1:0.7 or 1:0.8.

[0029] In this embodiment, during cable combustion, magnesium hydroxide powder decomposes into a large number of water molecules upon heating, absorbing a significant amount of heat. This lowers the ambient temperature around the cable core 1, reduces heat release, and slows down the rate of smoke production during cable combustion. Furthermore, the mixing ratio of magnesium hydroxide powder and sodium silicate solution ranges from 1:0.7 to 1:0.8, resulting in a suitable mixing ratio. This leads to a higher density of the mixed minerals 22, reducing the likelihood of oxygen presence within the filling space 21b. The reduced oxygen content shortens the duration of flame combustion. Additionally, the combustion products of magnesium hydroxide powder and sodium silicate solution are hard, dense, and thick shell-like substances that can adhere to the outer periphery of the cable core 1, further reducing the possibility of flames entering the cable core 1. This improves the cable's fire resistance and enhances the reliability of its normal operation.

[0030] In one embodiment, please refer to Figure 1 The insulated core 11 includes a conductor 111, a fire-resistant layer 112, and an insulation layer 113. The conductor 111 can be made of copper and may include multiple strands of twisted annealed copper wire. The cross-sectional area of ​​the conductor 111 can be in the range of 10 mm². 2 ~400mm 2The fire-resistant layer 112 is a mineral phlogopite tape, which is wrapped around the outer periphery of the conductor 111 to give the insulated core 11 a certain fire resistance. For example, the mineral phlogopite tape can be a high-temperature resistant (750℃) double-sided fiberglass reinforced three-in-one phlogopite tape, with a thickness of 0.12mm to 0.14mm. Two layers of mineral phlogopite tape can be wrapped around the outer periphery of the conductor 111. During the wrapping of the mineral phlogopite tape around the outer periphery of the conductor 111, the wrapping should be smooth, and the overlap rate of the mineral phlogopite tape in the wrapping direction should not be less than 25%. The insulation layer 113 is wrapped around the outer periphery of the fire-resistant layer 112. The insulation layer 113 is cross-linked polyethylene and is wrapped around the outer periphery of the fire-resistant layer 112 by extrusion. For example, after cross-linking, the molecular material of polyethylene changes from linear molecules to a network molecular structure. Cross-linked polyethylene can increase the operating temperature rating of conductor 111 from 70℃ to 90℃, and can also improve the mechanical properties and aging properties of polyethylene by 20% to 25%. The thickness of cross-linked polyethylene can be 0.7mm-2.0mm.

[0031] In one embodiment, please refer to Figure 1 The protective layer 3 includes a fiberglass tape 31 and an outer sheath 32. The fiberglass tape 31 is wrapped around the outer periphery of the fireproof layer 2 to secure it, for example, to secure the extruded mixed minerals 22. For example, the fiberglass tape 31 can be a low-smoke halogen-free fiberglass tape 31. The fiberglass tape 31 can be wrapped around the outer periphery of the mixed minerals 22 to tightly secure them. The fiberglass tape 31 can be wrapped in two layers around the outer periphery of the mixed minerals 22. The outer sheath 32 surrounds the outer periphery of the fiberglass tape 31 and is a low-smoke halogen-free flame-retardant polyolefin to reduce the possibility of damage to the fireproof layer 2. For example, the low-smoke halogen-free flame-retardant polyolefin serves as the outermost barrier of the cable. The thickness of the low-smoke halogen-free flame-retardant polyolefin can be 1.8mm to 3.5mm, and the oxygen index of the low-smoke halogen-free flame-retardant polyolefin is not less than 36 to protect the internal structure of the cable. Low-smoke halogen-free flame-retardant polyolefins have advantages such as low smoke emission, no halogen content, non-toxic combustion products, and environmental friendliness, meeting the requirements of relevant standards.

[0032] In this embodiment, both the glass fiber tape 31 and the outer sheath 32, which is a low-smoke halogen-free flame-retardant polyolefin, possess a certain degree of flexibility. The cable of this application lacks a metal sheath, and compared to fire-resistant cables with metal sheaths, such as copper-sheathed and aluminum-sheathed cables, it exhibits greater flexibility, making it easier to bend and thus easier and more convenient to lay and install. Furthermore, it is less expensive and offers higher cost-effectiveness. Under the same specifications, the production cost of the cable of this application can be reduced by approximately 25% to 30% compared to cables with copper sheaths, and by 5% to 10% compared to cables with aluminum sheaths.

[0033] In one embodiment, the protective layer 3 is configured to be orange, making the cable of this application more conspicuous and easy to identify, which meets fire protection requirements.

[0034] For example, the cable of this application can be subjected to tests in high-temperature environments such as flames, using methods such as metal rod impact vibration and spraying to simulate vibrations during fire rescue, with the test lasting for two hours. According to the test results, the cable of this application can remain intact and operational even after burning continuously for two hours under flame conditions of 850°C to 870°C, which is higher than the 750°C temperature of simple fire-resistant cables in related technologies.

[0035] The above description is the preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A cable, characterized in that, include: The cable core consists of multiple insulated wire cores twisted together. The fireproof layer includes a woven mesh and a mixed mineral. The woven mesh wraps around the outer periphery of the cable core, and the woven mesh and the cable core enclose a filling space. The woven mesh has a plurality of mesh holes that communicate with the filling space. The mixed mineral is configured to impede flames. A portion of the mixed mineral is disposed in the filling space and the mesh holes, and another portion of the mixed mineral surrounds the outer periphery of the woven mesh. A protective layer surrounds the outer periphery of the fireproof layer, the protective layer being configured to secure and protect the fireproof layer.

2. The cable according to claim 1, characterized in that, The mixed minerals include magnesium hydroxide and sodium silicate.

3. The cable according to claim 1, characterized in that, The insulated core includes a conductor, a fire-resistant layer, and an insulating layer. The fire-resistant layer surrounds the outer periphery of the conductor, and the insulating layer surrounds the outer periphery of the fire-resistant layer. The fire-resistant layer is mineral mica tape, and the insulating layer is cross-linked polyethylene.

4. The cable according to claim 1, characterized in that, The protective layer includes a glass fiber wrapping tape and an outer sheath. The glass fiber wrapping tape is wrapped around the outer periphery of the fireproof layer, and the outer sheath is surrounded around the outer periphery of the glass fiber wrapping tape. The outer sheath is a low-smoke, halogen-free, flame-retardant polyolefin.

5. The cable according to claim 1, characterized in that, The protective layer is configured to be orange.

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