New energy power grid composite fireproof low-voltage power cable

Abstract

This invention provides a composite fire-resistant low-voltage power cable for new energy power grids, relating to the field of low-voltage power cable technology. It includes: wires, insulating sheets, a diffusion component, an inner heat dissipation layer, a protective component, and an outer heat dissipation layer. By optimizing the overall cable structure design and heat dissipation system configuration, it significantly improves heat dissipation efficiency and structural stability. The uniform circumferential arrangement of multiple wires, combined with a dedicated diffusion component, can quickly collect the heat generated during wire operation and diffuse it evenly in all directions. Combined with the inner heat dissipation layer composed of composite thermally conductive powder, it forms a highly efficient heat-conducting network, rapidly conducting localized heat accumulation and effectively preventing aging and damage to the outer sheath caused by thermal stress concentration. Simultaneously, the supporting role of the insulating sheet and diffusion component not only achieves the connection between the inner and outer heat dissipation layers but also firmly fixes the position of the wires, preventing displacement and ensuring the structural reliability of the cable for long-term use.

Description

Technical Field

[0001] This invention relates to the field of low-voltage power cables, and in particular to a composite fire-resistant low-voltage power cable for new energy power grids. Background Technology

[0002] Currently, low-voltage power cables used in new energy power grids typically consist of multiple wire cores, sheathing, insulation structure, and outer protective sleeve. The wire cores are mostly made of wound copper wires, and insulation protection is achieved by wrapping them with sheathing. The insulation structure often uses a single rubber ring or braided layer to separate and position the wires. Fireproof and heat dissipation designs often rely on filling with conventional flame-retardant powder or using flame-retardant rubber sleeves. Heat dissipation and fire protection are achieved through the flame retardancy and basic thermal conductivity of the materials themselves, meeting the basic power transmission requirements of the power grid.

[0003] However, existing low-voltage power cables lack dedicated heat dissipation structures. The localized heat generated during operation is prone to accumulate, especially when the power grid operates intermittently or the load fluctuates. This concentrated thermal stress accelerates the aging of the insulation, and the fire resistance is poor. Conventional flame-retardant materials are prone to softening and collapsing at high temperatures, making it difficult to form a continuous and effective insulation barrier. Fire can spread rapidly, and the structural stability is insufficient. The cable arrangement is prone to displacement, and there is a lack of adaptive protection mechanisms. In the event of a fire, the cables cannot actively improve heat dissipation and insulation effects. Overall, the safety and service life cannot meet the high requirements of new energy power grids. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of this invention is to provide a new energy power grid composite fireproof low-voltage power cable that can solve the technical problems of thermal stress concentration leading to accelerated aging of the wrapping rubber and rapid spread of fire.

[0005] In a first aspect of the present invention, a new energy power grid composite fireproof low-voltage power cable is provided, comprising: wires, wherein there are no fewer than seven wires, one of which is located at the center, and the remaining multiple wires are arranged in a uniform circumference around the central wire, and the outer surface of the wires is covered with a protective rubber sheath. The isolation sheet is fixedly connected to the outer surface of the outermost layer of the wrapping rubber to form a circular isolation ring; A diffusion assembly is inserted into the gaps of multiple adjacent wrapping rubber sheets and is held in the gaps by the wrapping rubber sheets. The diffusion assembly includes a support pad, and a contact piece is fixedly connected to the outer surface of the support pad. The contact piece is attached to the outer surface of the wrapping rubber sheet. An inner heat dissipation layer, which is a thermally conductive powder and fills the gaps between multiple wrapping rubber sheets; The protective component includes a protective sleeve that is fitted over the outside of the circular isolation ring formed by the isolation plates. The diameter of the protective sleeve is larger than the diameter of the circular isolation ring formed by the isolation plates, thus forming a filling space. An external heat dissipation layer, which is a flame-retardant powder and fills the space between the protective sleeve and the insulating sheet.

[0006] In a second aspect of the present invention, a new energy power grid composite fireproof low-voltage power cable is provided, wherein the surface of the insulating sheet is provided with ventilation openings, and there are multiple ventilation openings evenly distributed on the outer surface of the insulating sheet, and the two ends of the ventilation openings are respectively connected to the inner heat dissipation layer and the outer heat dissipation layer.

[0007] In a third aspect of the present invention, a new energy power grid composite fireproof low-voltage power cable is provided, wherein a heat-conducting strip is fixedly connected inside the supporting rubber pad, the end of the heat-conducting strip is fixedly connected to the contact piece, and the contact piece is made of metal and the heat-conducting strip is made of metal.

[0008] In a fourth aspect of the present invention, a new energy power grid composite fireproof low-voltage power cable is proposed, wherein the supporting rubber pad includes a heat collection block and a heat dissipation strip; There are five heat collection blocks, which are horizontally and evenly arranged at the center of the support pad along the cable axis. The heat collection blocks are made of metal, and the end of the heat-conducting strip away from the contact piece is welded to the surface of the heat collection block. The heat dissipation strip is inserted inside the supporting rubber pad and is made of metal. It is inserted into the heat collection block and connects the five heat collection blocks in series.

[0009] In a fifth aspect of the present invention, a composite fireproof low-voltage power cable for new energy power grids is provided. Connecting plates are fixedly connected to the radial end surfaces of the supporting rubber pad, and heat dissipation blocks are fixedly connected to the upper and lower sides of the connecting plates. The connecting plates are made of rubber. The end of the heat dissipation strip away from the heat collection block is inserted into the interior of the connecting plate. The side surface of the heat dissipation block inserted into one end of the connecting plate is engaged with the end of the heat dissipation strip near the interior of the connecting plate. The heat dissipation block is made of metal, and the end away from the connecting plate is semi-circular and protrudes outward.

[0010] A sixth aspect of the present invention provides a composite fire-resistant low-voltage power cable for new energy power grids, wherein the protection component includes a movable groove and a movable block; The movable groove is formed on the inner side wall of the protective rubber sleeve and is arranged circumferentially. The movable block is slidably connected inside the movable groove. The movable groove is a T-shaped groove that is narrow at the top and wide at the bottom. The movable block is slidably connected inside the wider groove at the bottom of the movable groove.

[0011] In a seventh aspect of the present invention, a new energy power grid composite fireproof low-voltage power cable is provided. A return spring is fixedly connected to the radial edge of the surface of the movable block near the narrow end of the movable groove. A heat dissipation column is fixedly connected to the center of the upper surface of the movable block. A ventilation groove is provided at the center of the lower surface of the movable block. An exhaust hole is provided on the surface of the heat dissipation column. An anti-collision rubber head is fixedly connected to the upper end of the heat dissipation column.

[0012] In an eighth aspect of the present invention, a new energy power grid composite fireproof low-voltage power cable is provided, wherein the movable block and the heat dissipation column are made of metal, and the diameter of the heat dissipation column is the same as the diameter of the narrower groove at the upper end of the movable groove; the anti-collision rubber head is made of rubber and is semi-circularly convex; and the exhaust hole is interconnected with the ventilation groove.

[0013] In a ninth aspect of the present invention, a new energy power grid composite fireproof low-voltage power cable is proposed, wherein the inner heat dissipation layer is based on nano-aluminum hydroxide flame retardant and doped with graphene-boron nitride composite thermal conductive powder, and the doping ratio of nano-aluminum hydroxide flame retardant and graphene-boron nitride composite thermal conductive powder is 2:1.

[0014] In a tenth aspect of this invention, a new energy power grid composite fireproof low-voltage power cable is proposed, wherein the outer heat dissipation layer is made of micron-sized rigid ceramic microparticles.

[0015] The beneficial effects of the technical solutions provided in the embodiments of the present invention include at least the following: 1. In this embodiment of the invention, by optimizing the overall cable structure design and heat dissipation system configuration, the heat dissipation efficiency and structural stability are significantly improved. The uniform circumferential arrangement of multiple wires, combined with a dedicated diffusion component, can quickly collect the heat generated during the operation of the wires and diffuse it evenly in all directions. Combined with the inner heat dissipation layer composed of composite thermally conductive powder, a highly efficient heat conduction network is formed, which quickly conducts local heat accumulation and effectively avoids the aging and damage of the wrapping rubber caused by thermal stress concentration. At the same time, the supporting role of the insulating sheet and the diffusion component not only realizes the connection between the inner and outer heat dissipation layers, but also stabilizes and fixes the position of the wires, prevents displacement of the arrangement, and ensures the structural reliability of the cable for long-term use.

[0016] 2. In this embodiment of the invention, through the combination of fire-resistant performance and adaptive protection capability, the special flame-retardant material used in the outer heat dissipation layer can quickly form a dense insulating barrier when exposed to fire, which can withstand high temperatures and does not collapse, effectively blocking the path of fire spread. The active structure design of the protection component can be automatically triggered in fire or overheating scenarios, by increasing the heat dissipation area, expelling internal hot air and reducing air pressure, while also taking into account the anti-collision protection function to avoid secondary damage to the cable by external forces. The overall design realizes the synergistic effect of heat dissipation, fire prevention and protection, which greatly improves the safety and service life of low-voltage power cables in new energy power grids and is suitable for complex usage scenarios such as intermittent power grid operation and load fluctuations. Attached Figure Description

[0017] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts. Obviously, the drawings described below are merely some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0018] Figure 1 This invention provides a frontal three-dimensional structural diagram of the overall cable in a composite fire-resistant low-voltage power cable for new energy power grids. Figure 2 This invention provides a cross-sectional planar schematic diagram of the overall cable structure in a composite fire-resistant low-voltage power cable for new energy power grids; Figure 3 This invention provides a frontal three-dimensional structural diagram of the heat dissipation component of the inner layer of a composite fireproof low-voltage power cable for new energy power grids. Figure 4 This invention provides a cross-sectional plan view of the heat dissipation component of the inner layer of a composite fireproof low-voltage power cable for new energy power grids. Figure 5 This invention provides a frontal three-dimensional structural diagram of the cable and diffusion component in a composite fireproof low-voltage power cable for new energy power grids. Figure 6 This invention provides a frontal three-dimensional structural diagram of a diffusion component in a composite fire-resistant low-voltage power cable for new energy power grids. Figure 7 This invention provides a cross-sectional planar schematic diagram of the diffusion component in a composite fire-resistant low-voltage power cable for new energy power grids. Figure 8 This invention provides a cross-sectional plan view of the support pad portion in a composite fireproof low-voltage power cable for new energy power grids. Figure 9 This invention provides a cross-sectional planar schematic diagram of a protective component in a composite fire-resistant low-voltage power cable for new energy power grids. Figure 10 This invention provides a frontal three-dimensional structural diagram of a heat dissipation component in a composite fireproof low-voltage power cable for new energy power grids. Figure 11 This invention provides a cross-sectional planar schematic diagram of the protective sheath near the movable groove in a composite fireproof low-voltage power cable for new energy power grids.

[0019] Explanation of reference numerals in the attached drawings: 100, wire; 101, rubber wrapping; 102, insulating sheet; 1021, vent; 200, diffuser assembly; 201, supporting rubber pad; 202, contact piece; 203, heat-conducting strip; 204, heat collection block; 205, heat dissipation strip; 206, connecting piece; 207, heat dissipation block; 300, inner heat dissipation layer; 400, protective assembly; 401, protective rubber sleeve; 402, movable groove; 403, movable block; 404, return spring; 405, heat dissipation column; 406, anti-collision rubber head; 407, ventilation groove; 408, exhaust hole; 500, outer heat dissipation layer. Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solutions in the embodiments of the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0021] Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concepts disclosed in this invention.

[0022] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention.

[0023] Reference manual attached Figure 1 As shown, the present invention provides a new energy power grid composite fireproof low-voltage power cable, including: wires 100, not less than seven wires 100, one of which is located at the center, and the remaining multiple wires 100 are evenly arranged in a circle around the central wire 100, and the outer surface of the wires 100 is covered with a protective rubber 101. It should be noted that the wire 100 consists of multiple copper wires tightly wound together and tightly attached to the outer surface of the wire 100 by wrapping rubber 101, thus wrapping the copper wires to form a cable. One cable is located in the center, and the other multiple cables are arranged in a uniform circle around the central cable.

[0024] like Figure 3 As shown, the isolation sheet 102 is fixedly connected to the outer surface of the outermost wrapping rubber 101 to form a circular isolation ring; It should be noted that the isolation plate 102 is made of rubber and is arc-shaped. It fixes the outer ring of the wrapping rubber 101 to prevent displacement of the outer ring wrapping rubber 101 and forms a circular isolation ring for holding the heat dissipation filler.

[0025] like Figure 5 As shown, the diffusion component 200 is inserted into the gaps of multiple adjacent wrapping rubber sheets 101 and is held in the gaps by the wrapping rubber sheets 101. The diffusion component 200 includes a support rubber pad 201, and a contact piece 202 is fixedly connected to the outer surface of the support rubber pad 201. The contact piece 202 is attached to the outer surface of the wrapping rubber sheet 101. It should be noted that the diffusion component 200 is arranged along the axial direction of the cable, the support pad 201 is a block of rubber, and the outer surface of the contact piece 202 is arc-shaped, which is closely attached to the outer surface of the wrapping rubber 101. The heat generated by the wire 100 during operation is transferred to the interior of the contact piece 202 by heat conduction, and then diffused to the surrounding area by the diffusion component 200, thereby expanding the heat dissipation area.

[0026] like Figure 4 As shown, the inner heat dissipation layer 300 is a thermally conductive powder and fills the gaps between multiple wrapping rubber sheets 101; It should be noted that the inner heat dissipation layer 300 absorbs and conducts the heat generated by the wire 100 during operation, accelerating the dissipation of heat and preventing thermal stress concentration from causing cable damage.

[0027] like Figure 9 As shown, the protection component 400 includes a protective sleeve 401, which is fitted onto the outside of the circular isolation ring formed by the isolation plates 102. The diameter of the protective sleeve 401 is larger than the diameter of the circular isolation ring formed by the isolation plates 102, forming a filling space. It should be noted that the protective sleeve 401 is made of rubber, and the filling space can be filled with flame-retardant powder to further protect the wire 100.

[0028] like Figure 2 and Figure 9 As shown, the outer heat dissipation layer 500 is a flame-retardant powder and is filled in the filling space between the protective sleeve 401 and the isolation sheet 102. It should be noted that the outer heat dissipation layer 500 is in powder form. When dissipating heat, heat flows out through the gaps in the filler. When a fire occurs, the temperature rises further. At this time, the flame-retardant powder in the outer heat dissipation layer 500 clumps together, forming a dense insulating barrier that isolates the air, prevents the cable from collapsing, and prevents the fire from spreading.

[0029] The beneficial effects of the technical solutions provided in the embodiments of the present invention include at least the following: In this embodiment of the invention, by optimizing the overall cable structure design and heat dissipation system configuration, the heat dissipation efficiency and structural stability are significantly improved. The uniform circumferential arrangement of multiple wires 100, combined with the dedicated diffusion component 200, can quickly collect the heat generated by the wires 100 during operation and diffuse it evenly in all directions. Combined with the inner heat dissipation layer 300 composed of composite thermally conductive powder, a highly efficient heat conduction network is formed, which quickly conducts local heat accumulation and effectively avoids the aging and damage of the wrapping rubber 101 caused by thermal stress concentration. At the same time, the supporting role of the insulating sheet 102 and the diffusion component 200 not only realizes the connection between the inner heat dissipation layer 300 and the outer heat dissipation layer 500, but also stabilizes and fixes the position of the wires 100, prevents displacement of the arrangement, and ensures the structural reliability of the cable for long-term use.

[0030] In this embodiment of the invention, through the combination of fire-resistant performance and adaptive protection capability, the special flame-retardant material used in the outer heat dissipation layer 500 can quickly form a dense insulating barrier when exposed to fire, which can withstand high temperatures and does not collapse, effectively blocking the path of fire spread. The active structure design of the protection component 400 can be automatically triggered in fire or overheating scenarios. By increasing the heat dissipation area of ​​the heat dissipation column 405, exhausting internal hot air through the ventilation slot 407 and releasing it through the exhaust hole 408, the air pressure in the protective sleeve 401 is reduced. At the same time, the protective function of the anti-collision rubber head 406 is taken into account, avoiding secondary damage to the cable by external forces. The overall design realizes the synergistic effect of heat dissipation, fire prevention and protection, which greatly improves the safety and service life of low-voltage power cables in new energy power grids and is suitable for complex usage scenarios such as intermittent power grid operation and load fluctuations.

[0031] like Figures 2-3 As shown, in one possible implementation, the surface of the isolation plate 102 is provided with ventilation openings 1021. There are multiple ventilation openings 1021, which are evenly arranged on the outer surface of the isolation plate 102. The two ends of the ventilation openings 1021 are respectively connected to the inner heat dissipation layer 300 and the outer heat dissipation layer 500. In this embodiment of the invention, the vent 1021 connects the inner heat dissipation layer 300 and the outer heat dissipation layer 500, so that the heat inside the inner heat dissipation layer 300 can be transferred to the interior of the outer heat dissipation layer 500, thereby further improving heat transfer.

[0032] like Figure 7 As shown, in one possible implementation, a heat-conducting strip 203 is fixedly connected inside the support pad 201, and the end of the heat-conducting strip 203 is fixedly connected to the contact piece 202. The contact piece 202 is made of metal, and the heat-conducting strip 203 is made of metal. In this embodiment of the invention, the heat-conducting strip 203 conducts the heat of the contact piece 202 and further diffuses the heat, thus avoiding thermal stress concentration on the surface of the contact piece 202.

[0033] like Figures 7-8As shown, in one possible implementation, the support pad 201 includes a heat collection block 204 and a heat dissipation strip 205; There are five heat collection blocks 204, which are horizontally and evenly arranged at the center of the support pad 201 along the cable axis. The heat collection blocks 204 are made of metal, and the end of the heat conduction strip 203 away from the contact piece 202 is welded to the surface of the heat collection block 204. The heat sink 205 is inserted inside the support pad 201, and the heat sink 205 is made of metal. It is inserted into the heat collector 204, connecting the five heat collectors 204 in series. In this embodiment of the invention, the contact piece 202 conducts heat to the interior of the heat collection block 204 through the heat conduction strip 203. When the new energy grid operates intermittently, it will generate a large amount of heat intermittently. The heat accumulates inside the heat collection block 204, preventing heat from overflowing and causing damage to the wrapping rubber 101.

[0034] like Figures 5-8 As shown, in one possible embodiment, connecting plates 206 are fixedly connected to the radial end surfaces of the support pad 201, and heat sinks 207 are fixedly connected to the upper and lower sides of the connecting plates 206. The connecting plates 206 are made of rubber. The end of the heat sink 205 away from the heat collector 204 is inserted into the interior of the connecting plate 206. The heat sink 207 is inserted into the side surface of one end of the connecting plate 206 and is engaged with the end of the heat sink 205 near the interior of the connecting plate 206. The heat sink 207 is made of metal, and the end away from the connecting plate 206 is semi-circular and protrudes outward. In this embodiment of the invention, a support pad 201 is provided between each adjacent wrapping rubber 101, and each support pad 201 is fixedly connected by a connecting piece 206. The support pad 201 and the connecting piece 206 form a support body, and the support body is in the shape of a spider web. The surface of the support pad 201 is covered with a contact piece 202, and a heat sink 207 is fixedly connected to the surface of the connecting piece 206. The contact piece 202 is connected to the heat collection block 204 through a heat conduction strip 203, and the heat sink 207 is connected to the heat collection block 204 through a heat dissipation strip 205, so that the heat absorbed by the contact piece 202 from the wrapping rubber 101 is diffused to the interior of the inner heat dissipation layer 300 through the heat sink 207. Multiple heat sinks 207 are evenly arranged on the surface of the connecting piece 206, which increases the heat dissipation area and distributes heat evenly inside the inner heat dissipation layer 300.

[0035] like Figure 11 As shown, in one possible implementation, the protection component 400 includes a movable slot 402 and a movable block 403; The movable groove 402 is formed on the inner side wall of the protective sleeve 401 and is arranged in a circumferential direction. The movable block 403 is slidably connected to the inside of the movable groove 402. The movable groove 402 is a T-shaped groove that is narrow at the top and wide at the bottom. The movable block 403 is slidably connected to the inside of the wider groove at the bottom of the movable groove 402. In this embodiment of the invention, when the outer heat dissipation layer 500 is heated and agglomerated during a fire, it can push the movable block 403 inside the movable groove 402, and the movable block 403 slides into the interior of the movable groove 402, thereby achieving the effect of automatically driving the movable block 403 to move when a fire occurs.

[0036] like Figures 9-11 As shown, in one possible implementation, a return spring 404 is fixedly connected to the radial edge of the surface of the movable block 403 near the narrow end of the movable groove 402, a heat dissipation column 405 is fixedly connected to the center of the upper surface of the movable block 403, a ventilation groove 407 is provided at the center of the lower surface of the movable block 403, an exhaust hole 408 is provided on the surface of the heat dissipation column 405, and an anti-collision rubber head 406 is fixedly connected to the upper end of the heat dissipation column 405. In this embodiment of the invention, there are multiple movable grooves 402, which are evenly arranged on the surface of the protective rubber sleeve 401, increasing the diffusion area, and the anti-collision rubber head 406 prevents the heat dissipation column 405 from colliding with surrounding personnel and materials.

[0037] like Figure 11 As shown, in one possible implementation, the movable block 403 and the heat dissipation column 405 are made of metal, and the diameter of the heat dissipation column 405 is the same as the diameter of the narrower groove at the upper end of the movable groove 402. The anti-collision rubber head 406 is made of rubber and is semi-circular protrusion. The exhaust hole 408 is connected to the ventilation groove 407. In this embodiment of the invention, when the wire 100 overheats and causes a fire, the heat is transferred to the interior of the outer heat dissipation layer 500. At this time, the flame-retardant particles expand and agglomerate, squeezing the movable block 403. The movable block 403 is squeezed into the movable groove 402, which simultaneously drives the heat dissipation column 405 to move synchronously and squeezes the heat dissipation column 405 out of the movable groove 402. The contact area between the heat dissipation column 405 and the air increases, accelerating heat dissipation. When the heat and air pressure inside the protective sleeve 401 increase, airflow enters from the ventilation slot 407 and exits through the exhaust port 408, reducing the air pressure inside the protective sleeve 401 and improving the stability of the cable.

[0038] like Figure 2 and Figure 8 As shown, in one possible implementation, the inner heat dissipation layer 300 is based on nano-aluminum hydroxide flame retardant and doped with graphene-boron nitride composite thermal conductive powder, with the doping ratio of nano-aluminum hydroxide flame retardant and graphene-boron nitride composite thermal conductive powder being 2:1. In this embodiment of the invention, when the wire 100 is working normally, heat dissipates from the inside of the sheath 101 to the inside of the inner heat dissipation layer 300 around it, and the heat is dispersed by the graphene-boron nitride composite thermal conductive powder. When the wire 100 is overloaded, heat is transferred from the sheath 101 to the inside of the contact piece 202. The supporting pad 201 and the connecting piece 206 form a spider web, and the heat is evenly diffused to the inside of the inner heat dissipation layer 300 by the heat-conducting strip 203, the heat collection block 204, the heat dissipation strip 205 and the heat dissipation block 207. The heat is blocked by the nano aluminum hydroxide flame retardant and dissipated by the graphene-boron nitride composite thermal conductive powder. The thermal network quickly conducts the local heat accumulation of the wire core. Furthermore, the material is flexible and tightly fills the gaps at room temperature, which can quickly conduct local heat accumulation in the core caused by frequent start-stop and load fluctuations through the heat-conducting network, thereby reducing the aging rate of the insulation layer.

[0039] like Figure 2 As shown, in one possible implementation, the outer heat dissipation layer 500 is composed of micron-sized rigid ceramic microparticles. In this embodiment of the invention, micron-sized rigid ceramic microparticles rapidly vitrify upon contact with fire to form a dense insulating barrier that withstands high temperatures without collapsing. As the temperature continues to rise to the stage of fire development, the material will further expand and agglomerate to form a dense flame-retardant barrier layer, blocking the initial spread path of the fire source.

[0040] This invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this invention. To provide the public with a thorough understanding of this invention, specific details are described in detail in the preferred embodiments, while those skilled in the art will fully understand the invention even without these details. Furthermore, to avoid unnecessary misunderstanding of the essence of this invention, well-known methods, processes, procedures, components, and circuits are not described in detail.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the protection scope of the present invention.

Claims

1. A composite fire-resistant low-voltage power cable for new energy power grids, characterized in that, include: The wires, comprising no fewer than seven wires, one of which is located at the center, and the remaining multiple wires are arranged in a uniform circumference around the central wire, with the outer surface of each wire covered with a protective rubber sheath. The isolation sheet is fixedly connected to the outer surface of the outermost layer of the wrapping rubber to form a circular isolation ring; A diffusion assembly is inserted into the gaps of multiple adjacent wrapping rubber sheets and is held in the gaps by the wrapping rubber sheets. The diffusion assembly includes a support pad, and a contact piece is fixedly connected to the outer surface of the support pad. The contact piece is attached to the outer surface of the wrapping rubber sheet. An inner heat dissipation layer, which is a thermally conductive powder and fills the gaps between multiple wrapping rubber sheets; The protective component includes a protective sleeve that is fitted over the outside of the circular isolation ring formed by the isolation plates. The diameter of the protective sleeve is larger than the diameter of the circular isolation ring formed by the isolation plates, thus forming a filling space. An external heat dissipation layer, which is a flame-retardant powder and fills the space between the protective sleeve and the insulating sheet.

2. The new energy power grid composite fireproof low-voltage power cable according to claim 1, characterized in that: The surface of the isolation plate has ventilation openings. There are multiple ventilation openings, which are evenly distributed on the outer surface of the isolation plate. The two ends of the ventilation openings are respectively connected to the inner heat dissipation layer and the outer heat dissipation layer.

3. The new energy power grid composite fireproof low-voltage power cable according to claim 1, characterized in that: A heat-conducting strip is fixedly connected inside the supporting rubber pad. The end of the heat-conducting strip is fixedly connected to the contact piece, and both the contact piece and the heat-conducting strip are made of metal.

4. The new energy power grid composite fireproof low-voltage power cable according to claim 3, characterized in that: The supporting rubber pad includes a heat collection block and a heat dissipation strip; There are five heat collection blocks, which are horizontally and evenly arranged at the center of the support pad along the cable axis. The heat collection blocks are made of metal, and the end of the heat-conducting strip away from the contact piece is welded to the surface of the heat collection block. The heat dissipation strip is inserted inside the supporting rubber pad and is made of metal. It is inserted into the heat collection block and connects the five heat collection blocks in series.

5. The new energy power grid composite fireproof low-voltage power cable according to claim 4, characterized in that: Connecting plates are fixedly connected to both radial ends of the supporting rubber pad. Heat dissipation blocks are fixedly connected to the upper and lower sides of the connecting plates. The connecting plates are made of rubber. The end of the heat dissipation strip away from the heat collection block is inserted into the interior of the connecting plate. The side surface of the heat dissipation block inserted into one end of the connecting plate is engaged with the end of the heat dissipation strip near the interior of the connecting plate. The heat dissipation block is made of metal, and the end away from the connecting plate is semi-circular and protrudes outward.

6. The new energy power grid composite fireproof low-voltage power cable according to claim 1, characterized in that: The protection component includes a movable slot and a movable block; The movable groove is formed on the inner side wall of the protective rubber sleeve and is arranged circumferentially. The movable block is slidably connected inside the movable groove. The movable groove is a T-shaped groove that is narrow at the top and wide at the bottom. The movable block is slidably connected inside the wider groove at the bottom of the movable groove.

7. The new energy power grid composite fireproof low-voltage power cable according to claim 6, characterized in that: A return spring is fixedly connected to the radial edge of the surface of the movable block near the narrow end of the movable slot. A heat dissipation column is fixedly connected to the center of the upper surface of the movable block. A ventilation slot is opened at the center of the lower surface of the movable block. An exhaust hole is opened on the surface of the heat dissipation column. An anti-collision rubber head is fixedly connected to the upper end of the heat dissipation column.

8. The new energy power grid composite fireproof low-voltage power cable according to claim 7, characterized in that: The movable block and the heat dissipation column are made of metal, and the diameter of the heat dissipation column is the same as the diameter of the narrower groove at the upper end of the movable groove. The anti-collision rubber head is made of rubber and is semi-circular and protruding. The exhaust hole is connected to the ventilation groove.

9. The new energy power grid composite fireproof low-voltage power cable according to claim 1, characterized in that: The inner heat dissipation layer is based on nano-aluminum hydroxide flame retardant and doped with graphene-boron nitride composite thermal conductive powder. The doping ratio of nano-aluminum hydroxide flame retardant to graphene-boron nitride composite thermal conductive powder is 2:

1.

10. The new energy power grid composite fireproof low-voltage power cable according to claim 1, characterized in that: The outer heat dissipation layer is composed of micron-sized rigid ceramic microparticles.

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