Halogen-free fireproof flame-retardant cable and preparation method thereof

Abstract

The invention discloses a halogen-free fireproof flame-retardant cable and a preparation method thereof, and relates to the technical field of flame-retardant cables.The halogen-free fireproof flame-retardant cable comprises six cable cores, each cable core is composed of a copper stranded wire and a cross-linked polyethylene pipe, and a cooling mechanism is fixedly installed on the outer surface of each cable core. The end face of the cooling mechanism is fixedly connected with an end face plate. According to the halogen-free fireproof flame-retardant cable and the preparation method thereof, the spiral strip is welded and fixedly connected with the inner side face of the spiral piece through the cutting groove, the ventilation assembly guides purified gas into the position between the plastic tube and the heat shrink tube, and liquid carbon dioxide flows in the metal hose; the connection of the extension strip enables the temperature near the spiral sheet to be conducted to the low-temperature carbon dioxide, and the temperature of the spiral sheet is rapidly reduced, thereby achieving the purpose of reducing the temperature around the wire core, and solving the problem that the temperature of the conductive wire core is higher under high voltage, and is liable to cause cable combustion.

Description

Technical Field

[0001] The present invention relates to the technical field of flame-retardant cables, and specifically to a halogen-free fireproof and flame-retardant cable and a preparation method thereof. Background Art

[0002] A fire-resistant cable refers to a cable that can maintain safe operation for a certain period of time under the condition of flame combustion. A power cable is a wire or cable specifically used for transmitting and distributing electric energy. They are widely used in power systems, including power plants, transmission systems, distribution systems, and ultimately the electricity-consuming terminals. Power cables can carry currents of different voltage levels, from low-voltage household cables to high-voltage long-distance transmission cables. With the frequent occurrence of fire accidents, the flame-retardant problem of wires and cables has gradually attracted attention. Existing power cables often release harmful gases such as chlorine and toxic smoke when burning, endangering the health of escapees and firefighters and polluting the environment, generating a large amount of thick smoke. Chinese Patent Publication No.: CN113707383B discloses "A Halogen-Free Low-Smoke Flame-Retardant Environmentally Friendly Fireproof Cable". In this patent, a fireproof and flame-retardant layer is arranged outside the positioning layer. During application, the cable can bend at adjacent fireproof monomers, and the cable can be wound up for easy transportation. When there is no fire, the heat of the cable core can dissipate to the outside through the gaps between adjacent arc-shaped fireproof sheets. When a fire occurs, the external temperature of the cable rises. At this time, the heat-expandable rod expands when heated, causing multiple arc-shaped fireproof sheets to move synchronously towards the cable core and squeeze the belt body until the adjacent ends of multiple arc-shaped fireproof sheets contact each other, forming an annular fireproof partition layer to prevent the spread of fire to the cable core.

[0003] For existing halogen-free fireproof and flame-retardant cables and their preparation methods, due to structural design defects, there are problems that the temperature of the conductive wire core is relatively high under high voltage, which easily leads to cable combustion, and a large amount of smoke and toxic gases are generated when halogen-based flame retardants burn, and the flame will spread along the polymer near the air surface. Summary of the Invention

[0004] The present invention provides a halogen-free fireproof and flame-retardant cable and a preparation method thereof, which solve the problems mentioned in the above background art.

[0005] To achieve the above objectives, the present invention is realized through the following technical solutions: A halogen-free fireproof and flame-retardant cable includes a wire core, the wire core is composed of a copper stranded wire and a cross-linked polyethylene tube, and the number of wire cores is six. It also includes:

[0006] A temperature reduction mechanism, the temperature reduction mechanism is fixedly installed on the outer surface of the wire core, an end panel is fixedly connected to the end face position of the temperature reduction mechanism, and a glue injection pipe is fixedly connected to the surface of the end panel;

[0007] Flame retardant mechanism, the flame retardant mechanism is fixedly installed on the outer surface of the cooling mechanism, a metal hose is fixedly connected to the upper position of the inner side surface of the flame retardant mechanism, liquid carbon dioxide flows inside the metal hose, a special-shaped pipe is fixedly connected to the end surface position of the flame retardant mechanism, and a glue injection hole is opened at the top of the special-shaped pipe;

[0008] Ventilation component, the ventilation component is fixedly installed on the outer surface of the special-shaped pipe, the ventilation component is used for drying the gas outside the cable and importing and transporting the dried gas. The conductor inside the wire core generates heat. Currently, the wire core is surrounded by polyethylene material for insulation and centering, and it is difficult for the heat of the wire core to be discharged. In this device, the centering component supports and limits multiple wire cores. The hemp rope in the middle position of the centering component supports the overall structure. When the cable as a whole is subjected to external force, the hemp rope can increase the overall anti-torsion deformation ability of the centering component. There are cut grooves on the surface of the plastic pipe;

[0009] Among them, the cooling mechanism includes a centering component, the inner side surface of the centering component is fixedly connected to the surface of the wire core, a plastic pipe is fixedly connected to the surface of the centering component, a spiral strip is fixedly connected inside the plastic pipe, a spiral fin is welded and fixed on the outer surface of the spiral strip, and a heat shrinkable tube is fixedly connected to the outer surface of the spiral fin.

[0010] Preferably, a hemp rope is fixedly connected to the middle position of the inner side surface of the centering component, an extension strip is fixedly connected to the surface of the spiral fin, cut grooves are opened on the surface of the plastic pipe, the embedding wire is coated on the inner side surface of the partition board, and the surface of the embedding wire extends to the outside of the partition board. The embedding wire is coated inside the partition board, and the spiral strip is coated inside the plastic pipe. During installation, the embedding wire, the partition board and the round pipe form a first overall structure, and the spiral strip and the plastic pipe form a second overall structure. The winding strip is stuffed into the inner side surface of the first overall structure, the hemp rope is passed through the inner side surface of the winding strip, and the second overall structure is sleeved on the outside of the first overall structure.

[0011] Preferably, the centering component includes a round pipe, a partition board is fixedly connected to the surface of the round pipe, a winding strip is fixedly connected to the inner side surface of the round pipe, and through holes are opened on the surfaces of the round pipe and the partition board.

[0012] Preferably, the centering component includes an embedding wire, the surface of the embedding wire is fixedly installed on the outer surface of the winding strip by gluing, and the surface of the embedding wire away from the winding strip is fixedly installed on the inner side surface of the spiral strip by gluing. The arc plate and the ball effectively reduce the frictional resistance during cable dragging. After the inside of the plastic pipe is injected with silicone paint, multiple partition boards firmly support multiple wire cores. The spiral fin is sleeved on the outside of the plastic pipe, and the spiral strip is firmly connected to the inner side surface of the spiral fin by welding. The heat shrinkable tube is sleeved on the outside of the spiral fin, and then the heat shrinkable tube is heated to firmly wrap on the outside of the spiral fin.

[0013] Preferably, the flame retardant mechanism includes a support assembly fixedly installed on the outer surfaces of the heat shrinkable tube and the metal hose. A fire detector is fixedly connected to a position near the middle of the surface of the support assembly.

[0014] Preferably, there are two support assemblies, and the two support assemblies are tightly connected by bolts. An arc plate is fixedly connected to the bottom of the support assembly, and a ball is rotatably connected to the inner side surface of the arc plate.

[0015] Preferably, the support assembly includes a component wall. A side plate is fixedly connected to the end surface position of the component wall. A special-shaped groove is formed on the surface of the side plate. The end surface of the special-shaped tube is embedded into the inside of the special-shaped groove and fixed by a pin. An end panel seals and fixes the end surface position of the heat shrinkable tube. A control valve is installed on the top of the metal hose. The input end of the control valve extends into the inside of the metal hose. When the component walls are combined, the output end of the control valve extends into the inside of the component wall and is hermetically connected. The opposing component walls are fastened by bolts. The output end of the fire detector is electrically connected to the input end of the control valve.

[0016] Preferably, a first arc surface and a second arc surface are respectively arranged on the surface of the component wall. The first arc surface is in close contact with the outer surface of the metal hose, and the second arc surface is in close contact with the outer surface of the heat shrinkable tube.

[0017] Preferably, a flow cavity is formed inside the component wall. An overflow hole is formed on the surface of the component wall. A rubber plug is in interference fit with the component wall near the overflow hole. A control valve is fixedly connected to the upper position of the inner side surface of the component wall. The special-shaped tube is pulled and pressed into the inside of the special-shaped groove and fixed by a pin. There is a filling gap between the special-shaped tube and the metal hose and the heat shrinkable tube. The bent tube passes through the special-shaped tube and the heat shrinkable tube in sequence to the position of the spiral sheet, and then a rubber tube is inserted into the gap between the special-shaped tube and the bent tube for sealing. The inner threaded cylinder and the threaded tube are quickly hermetically joined. Silicone paint is poured into the inside of the special-shaped tube through the glue injection hole.

[0018] Preferably, the ventilation assembly includes a bent tube. The bottom end of the bent tube penetrates through the surface of the heat shrinkable tube. A rubber tube is fixedly connected to the position between the heat shrinkable tube and the bent tube. The top end of the bent tube is fixedly connected with an inner threaded cylinder.

[0019] Preferably, the ventilation assembly further includes a threaded tube. The surface of the threaded tube is connected to the inner side surface of the inner threaded cylinder by threads. A ventilation pipe is fixedly connected to the end surface of the threaded tube. An air pump is fixedly connected to the bottom end of the ventilation pipe. The air pump is fixedly installed on the surface of the special-shaped tube.

[0020] A preparation method of a halogen-free fireproof and flame retardant cable includes the following steps:

[0021] Step 1: Manufacturing of the conductor core. At room temperature, a copper rod is drawn into copper wires. The copper wires are heated and kept at a constant temperature, and then naturally cooled. The copper wires are stranded in a way of stranding multiple single wires to form a copper stranded wire. A traction machine is used to draw the copper stranded wire to be coated into the internal part of an injection extrusion machine to coat a heat-melt cross-linked polyethylene material. After cooling and shaping, a core is formed. Subsequently, the manufacturing of multiple cores is completed in sequence.

[0022] Step 2: Installation of the centering structure. Embedded wires, partitions, and a circular tube form a first integral structure, and a spiral strip and a plastic tube form a second integral structure. The winding strip is inserted into the inner side of the first integral structure, a hemp rope is threaded into the inner side of the winding strip, and the second integral structure is sleeved outside the first integral structure. The winding strip, the embedded wires, and the spiral strip are in close contact. Silicone filling material is poured into the interior of the plastic tube through a glue injection tube.

[0023] Step 3: Installation of the flame-retardant structure. The spiral sheet is sleeved on the outer surface of the plastic tube, and the spiral strip is firmly connected to the inner side of the spiral sheet by welding. A heat-shrinkable tube is sleeved on the outer surface of the spiral sheet. The bottom of the metal hose passes through the extension strip for fixation. Two support components move towards each other and are sleeved on the outer surface of the heat-shrinkable tube. The two support components are firmly connected by bolts. Subsequently, a fire detector is fixedly installed on the outer surface of the support component.

[0024] Step 4: Glue injection, shaping, and sealing. The end face plate seals and fixes the end face position of the heat-shrinkable tube. A control valve is installed on the top of the metal hose. The input end of the control valve extends into the interior of the metal hose. When the component walls are combined, the output end of the control valve extends into the interior of the component wall and is hermetically connected. The opposite component walls are firmly connected by bolts. The special-shaped tube is pulled and pressed into the special-shaped groove and fixed by a pin. Silicone paint is poured into the interior of the special-shaped tube through a glue injection hole. After the silicone paint cools and shapes, a sealed filling is achieved between the heat-shrinkable tube and the special-shaped tube.

[0025] The present invention provides a halogen-free fire-resistant and flame-retardant cable and its preparation method. It has the following beneficial effects:

[0026] 1. For the halogen-free fire-resistant and flame-retardant cable and its preparation method, the spiral strip is fixedly connected to the inner side of the spiral sheet through a cut groove and welding. The ventilation component introduces the purified gas to the position between the plastic tube and the heat-shrinkable tube. Liquid carbon dioxide flows inside the metal hose. The connection of the extension strip conducts the temperature near the spiral sheet to the low-temperature carbon dioxide, and the temperature of the spiral sheet rapidly decreases, thereby achieving the purpose of reducing the temperature around the core and solving the problem that the high temperature of the conductor core under high pressure easily leads to the combustion of the cable.

[0027] 2. For this halogen-free fireproof and flame-retardant cable and its preparation method, the winding strip, the embedded wire, and the spiral strip are in close contact. Silicone filler is poured into the interior of the plastic tube through a glue injection tube. The through holes provided on the partition plate and the surface of the circular tube enable the paint to evenly fill the gap. After the silicone paint cools, the overall structure of the centering component is formed. The multiple partition plates stably support the multiple wire cores. At the same time, due to the high heat conduction efficiency between metals, the heat of the wire core is quickly conducted to the spiral sheet and carried away, making the heat dissipation more efficient.

[0028] 3. For this halogen-free fireproof and flame-retardant cable and its preparation method, the bottom of the metal hose is fixed by passing through the extension strip. At this time, the top of the extension strip extends into the interior of the metal hose. The two support components move towards each other and are sleeved on the outer surface of the heat shrinkable tube. The two support components are tightly connected by bolts. The surface of the support component supports the outer surfaces of the metal hose and the heat shrinkable tube in sequence. The open flame detector detects the open flame outside the special-shaped tube. When an open flame appears, the liquid carbon dioxide inside the metal hose quickly sprays out along the support component and gasifies, so as to achieve the purpose of quickly extinguishing the fire.

[0029] 4. For this halogen-free fireproof and flame-retardant cable and its preparation method, when an open flame appears outside the special-shaped tube, the control valve opens, and the carbon dioxide liquid flowing inside the metal hose flows into the flow cavity. The carbon dioxide liquid quickly gasifies and expands. The gas expansion causes the rubber plug to rush out of the overflow hole. After the carbon dioxide liquid rushes out of the overflow hole and further gasifies, the flame is quickly blocked to achieve the purpose of flame retardancy, replacing the use of halogen-based flame retardants in the prior art, and solving the problems that a large amount of smoke and toxic gases are generated when halogen-based flame retardants burn, and the flame will spread along the polymer close to the air surface.

[0030] 5. For this halogen-free fireproof and flame-retardant cable and its preparation method, after the silicone paint cools and sets, the heat shrinkable tube and the special-shaped tube are hermetically filled, avoiding external impurities and water vapor from entering the cable. The spiral sheet is cooled through the extension strip. The interior of the ventilation pipe is filled with filler adsorption particles. The air pump transports the gas outside the cable into the interior of the ventilation pipe. The purified gas is introduced into the interior of the heat shrinkable tube and flows along the spiral sheet. When the gas flows through the spiral sheet, the temperature decreases, thereby quickly carrying away the heat of the wire core, preventing the cable from being interfered by external impurities and gases, and at the same time, making the flame retardant effect of the cable better. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a flowchart of the preparation method of the halogen-free fireproof and flame-retardant cable of the present invention;

[0032] Figure 2 is a three-dimensional view of the overall halogen-free fireproof and flame-retardant cable of the present invention;

[0033] Figure 3 is a three-dimensional view of the interior of the halogen-free fireproof and flame-retardant cable of the present invention;

[0034] Figure 4 This is the schematic structural diagram of the overall cooling mechanism of the present invention;

[0035] Figure 5 This is the schematic structural diagram of the partial cooling mechanism of the present invention;

[0036] Figure 6 This is the schematic structural diagram of the centering component of the present invention;

[0037] Figure 7 This is the schematic structural diagram of the overall flame retardant mechanism of the present invention;

[0038] Figure 8 This is the schematic structural diagram of the partial flame retardant mechanism of the present invention;

[0039] Figure 9 This is the schematic structural diagram of the support component of the present invention;

[0040] Figure 10 This is the schematic structural diagram of the ventilation component of the present invention.

[0041] In the figure: 1, wire core; 2, cooling mechanism; 21, centering component; 211, round tube; 212, partition board; 213, through hole; 214, winding strip; 215, embedding wire; 22, hemp rope; 23, plastic pipe; 231, cutting groove; 24, spiral strip; 25, spiral piece; 26, heat shrinkable tube; 27, extension strip; 3, end face plate; 4, glue injection tube; 5, flame retardant mechanism; 51, support component; 511, component wall; 512, side plate; 513, special-shaped groove; 514, flow cavity; 515, overflow hole; 516, rubber plug; 517, first arc surface; 518, second arc surface; 52, open fire detector; 53, arc plate; 54, ball; 6, metal hose; 61, control valve; 7, special-shaped tube; 71, glue injection hole; 8, ventilation component; 81, bent tube; 82, rubber tube; 83, internal thread cylinder; 84, threaded tube; 85, ventilation pipe; 86, air pump. Specific embodiments

[0042] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0043] The first embodiment: As Figures 1 - 4As shown in the figure, the present invention provides a technical solution: a halogen-free fireproof and flame-retardant cable, including a wire core 1, which is composed of a copper stranded wire and a cross-linked polyethylene tube. There are six wire cores 1, and it also includes a temperature reduction mechanism 2, a flame retardant mechanism 5, and a ventilation component 8. The temperature reduction mechanism 2 is fixedly installed on the outer surface of the wire core 1. A end panel 3 is fixedly connected to the end face position of the temperature reduction mechanism 2, and a glue injection tube 4 is fixedly connected to the surface of the end panel 3. The flame retardant mechanism 5 is fixedly installed on the outer surface of the temperature reduction mechanism 2;

[0044] A metal hose 6 is fixedly connected to the upper position of the inner side of the flame retardant mechanism 5. Liquid carbon dioxide flows inside the metal hose 6. An irregular tube 7 is fixedly connected to the end face position of the flame retardant mechanism 5, and a glue injection hole 71 is opened at the top of the irregular tube 7;

[0045] The ventilation component 8 is fixedly installed on the outer surface of the irregular tube 7, and is used for drying the gas outside the cable and introducing and transporting the dried gas;

[0046] Among them, the temperature reduction mechanism 2 includes a centering component 21. The inner side of the centering component 21 is fixedly connected to the surface of the wire core 1. A plastic tube 23 is fixedly connected to the surface of the centering component 21. A spiral strip 24 is fixedly connected inside the plastic tube 23. A spiral fin 25 is welded and fixed to the outer surface of the spiral strip 24. A heat shrinkable tube 26 is fixedly connected to the outer surface of the spiral fin 25;

[0047] A hemp rope 22 is fixedly connected to the middle position of the inner side of the centering component 21. An extension strip 27 is fixedly connected to the surface of the spiral fin 25. A cut groove 231 is opened on the surface of the plastic tube 23.

[0048] During use, the conductor inside the wire core 1 generates heat. In the existing wire core 1, the surrounding is wrapped with polyethylene material for insulation and centering, and the heat of the wire core 1 is difficult to discharge. In this device, the centering component 21 supports and limits multiple wire cores 1. The hemp rope 22 in the middle position of the centering component 21 supports the overall structure. When the cable as a whole is subjected to external force, the hemp rope 22 can increase the overall anti-torsion deformation ability of the centering component 21. The cut groove 231 is opened on the surface of the plastic tube 23, and the spiral strip 24 is fixedly connected to the inner side of the spiral fin 25 through the cut groove 231 by welding. The ventilation component 8 introduces the purified gas to the position between the plastic tube 23 and the heat shrinkable tube 26. Liquid carbon dioxide flows inside the metal hose 6. The connection of the extension strip 27 conducts the temperature near the spiral fin 25 to the low-temperature carbon dioxide, and the temperature of the spiral fin 25 rapidly decreases, so as to achieve the purpose of reducing the temperature around the wire core 1, and solve the problem that the high temperature of the conductive wire core under high pressure is likely to cause the cable to burn.

[0049] Second embodiment: As Figure 4 、 Figure 5 、 Figure 6As shown in the figure, the centering assembly 21 includes a circular tube 211. A partition plate 212 is fixedly connected to the surface of the circular tube 211. A winding strip 214 is fixedly connected to the inner side surface of the circular tube 211. Through holes 213 are formed in the surfaces of both the circular tube 211 and the partition plate 212. The centering assembly 21 includes an embedding wire 215. The surface of the embedding wire 215 is fixedly installed on the outer surface of the winding strip 214 by gluing. The surface of the embedding wire 215 away from the winding strip 214 is fixedly installed on the inner side surface of the spiral strip 24 by gluing.

[0050] During use, the embedding wire 215 is wrapped around the inner side surface of the partition plate 212, and the surface of the embedding wire 215 extends to the outside of the partition plate 212. The embedding wire 215 is wrapped inside the partition plate 212, and the spiral strip 24 is wrapped inside the plastic tube 23. During installation, the embedding wire 215, the partition plate 212, and the circular tube 211 form a first integral structure, and the spiral strip 24 and the plastic tube 23 form a second integral structure. The winding strip 214 is stuffed into the inner side surface of the integral structure, the hemp rope 22 is inserted into the inner side surface of the winding strip 214, and the second integral structure is sleeved outside the first integral structure. The winding strip 214, the embedding wire 215, and the spiral strip 24 are in close contact. Silicone filler is poured into the plastic tube 23 through the injection tube 4. The through holes 213 formed in the surfaces of the partition plate 212 and the circular tube 211 enable the coating to evenly fill the gaps. After the silicone coating cools, the integral structure of the centering assembly 21 is formed. Multiple partition plates 212 stably support multiple wire cores 1. At the same time, due to the high heat conduction efficiency between metals, the heat of the wire core 1 is quickly conducted to the spiral fins 25 and carried away, making the heat dissipation more efficient.

[0051] Third Embodiment: As Figure 7 、 Figure 8 shown in the figure, the flame retardant mechanism 5 includes a support assembly 51. The support assembly 51 is fixedly installed on the outer surfaces of the heat shrinkable tube 26 and the metal hose 6. A fire detector 52 is fixedly connected to a position near the middle of the surface of the support assembly 51. The number of the support assemblies 51 is two, and the two support assemblies 51 are tightly connected by bolts. An arc plate 53 is fixedly connected to the bottom of the support assembly 51. A ball 54 is rotatably connected to the inner side surface of the arc plate 53.

[0052] During use, the arc plate 53 and the ball 54 effectively reduce the frictional resistance during cable dragging. After the inside of the plastic pipe 23 is injected with silicone paint, multiple partition plates 212 firmly support multiple wire cores 1. The spiral piece 25 is sleeved on the outer surface of the plastic pipe 23, and the spiral strip 24 is firmly connected to the inner side surface of the spiral piece 25 by welding. The heat shrinkable tube 26 is sleeved on the outer surface of the spiral piece 25, and then the heat shrinkable tube 26 is heated to firmly cover the outer surface of the spiral piece 25. The bottom of the metal hose 6 is fixed by passing through the extension strip 27. At this time, the top end of the extension strip 27 extends into the metal hose 6. Two support assemblies 51 move towards each other and are sleeved on the outer surface of the heat shrinkable tube 26. The two support assemblies 51 are firmly connected by bolts. The surface of the support assembly 51 supports the outer surfaces of the metal hose 6 and the heat shrinkable tube 26 in sequence. The open flame detector 52 detects the open flame outside the special-shaped pipe 7. When an open flame appears, the liquid carbon dioxide inside the metal hose 6 quickly sprays out along the support assembly 51 and vaporizes, so as to achieve the purpose of quickly extinguishing the fire.

[0053] Fourth Embodiment: As Figure 4 , Figure 5 , Figure 9 shown, the support assembly 51 includes an assembly wall 511. A side plate 512 is fixedly connected to the end face position of the assembly wall 511. A special-shaped groove 513 is formed on the surface of the side plate 512. The end face of the special-shaped pipe 7 is embedded into the special-shaped groove 513 and fixed by a pin. The surface of the assembly wall 511 is respectively provided with a first arc surface 517 and a second arc surface 518. The first arc surface 517 is in close contact with the outer surface of the metal hose 6, and the second arc surface 518 is in close contact with the outer surface of the heat shrinkable tube 26. A flow cavity 514 is formed inside the assembly wall 511. An overflow hole 515 is formed on the surface of the assembly wall 511. A rubber plug 516 is in interference fit with the assembly wall 511 near the overflow hole 515. A control valve 61 is fixedly connected to the upper position of the inner side surface of the assembly wall 511.

[0054] In use, the end panel 3 seals and fixes the end face position of the heat-shrinkable tube 26. The control valve 61 is installed on the top of the metal hose 6. The input end of the control valve 61 extends into the interior of the metal hose 6. When the component walls 511 are joined, the output end of the control valve 61 extends into the interior of the component wall 511 and is hermetically connected. The opposing component walls 511 are fastened by bolts. The output end of the open flame detector 52 is electrically connected to the input end of the control valve 61. When an open flame appears outside the special-shaped tube 7, the control valve 61 opens, and the carbon dioxide liquid flowing inside the metal hose 6 flows into the flow chamber 514. The carbon dioxide liquid quickly vaporizes and expands. The gas expansion causes the rubber plug 516 to rush out of the overflow hole 515. After the carbon dioxide liquid rushes out of the overflow hole 515, it further vaporizes, so that the flame is quickly blocked to achieve the purpose of flame retardance, replacing the use of halogen-based flame retardants in the prior art, and solving the problems that a large amount of smoke and toxic gases are generated when halogen-based flame retardants burn, and the flame will spread along the polymer close to the air surface.

[0055] The fifth embodiment: As Figure 4 , Figure 10 shown, the ventilation component 8 includes a bent tube 81. The bottom end of the bent tube 81 penetrates the surface of the heat-shrinkable tube 26. A rubber tube 82 is fixedly connected at the position between the heat-shrinkable tube 26 and the bent tube 81. The top end of the bent tube 81 is fixedly connected with an internal thread cylinder 83. The ventilation component 8 further includes a threaded tube 84. The surface of the threaded tube 84 is connected to the inner side surface of the internal thread cylinder 83 through threads. The end face of the threaded tube 84 is fixedly connected with a ventilation tube 85. The bottom end of the ventilation tube 85 is fixedly connected with an air pump 86. The air pump 86 is fixedly installed on the surface of the special-shaped tube 7.

[0056] In use, the special-shaped tube 7 is pulled and pressed into the interior of the special-shaped groove 513 and fixed by a pin. There is a filling gap between the special-shaped tube 7, the metal hose 6 and the heat-shrinkable tube 26. The bent tube 81 passes through the special-shaped tube 7 and the heat-shrinkable tube 26 in sequence to the position of the spiral fin 25. Then, the rubber tube 82 is stuffed into the gap between the special-shaped tube 7 and the bent tube 81 for sealing. The internal thread cylinder 83 and the threaded tube 84 are quickly and hermetically joined. Silicone paint is poured into the interior of the special-shaped tube 7 through the glue injection hole 71. After the silicone paint cools and sets, the heat-shrinkable tube 26 and the special-shaped tube 7 are hermetically filled, preventing external impurities and water vapor from entering the cable. The spiral fin 25 is cooled by the extension strip 27. The interior of the ventilation tube 85 is filled with packing adsorption particles. The air pump 86 transports the gas outside the cable into the interior of the ventilation tube 85. The purified gas is introduced into the interior of the heat-shrinkable tube 26 and flows along the spiral fin 25. The temperature decreases when the gas flows through the spiral fin 25, so as to quickly take away the heat of the wire core 1, prevent the cable from being interfered by external impurities and gases, and at the same time, make the flame retardant effect of the cable better.

[0057] The sixth embodiment: As Figures 1 - 10As shown, a method for preparing a halogen-free fireproof and flame-retardant cable includes the following steps:

[0058] Step 1: Manufacture of the conductor core. At room temperature, a copper rod is drawn into copper wires, the copper wires are heated and kept at a certain temperature, and then naturally cooled. The copper wires are stranded in a way of multiple single wires to form a copper stranded wire. A traction machine is used to draw the copper stranded wire to be coated into the interior of an injection extrusion machine to coat it with a heat-melt cross-linked polyethylene material. After cooling and shaping, core 1 is formed. Subsequently, the manufacture of multiple cores 1 is completed in sequence.

[0059] Step 2: Installation of the centering structure. Insertion wires 215, partitions 212, and a circular tube 211 form a first integral structure, and a spiral strip 24 and a plastic tube 23 form a second integral structure. The winding strip 214 is stuffed into the inner side of the first integral structure, a hemp rope 22 is threaded into the inner side of the winding strip 214, and the second integral structure is sleeved outside the first integral structure. The winding strip 214, insertion wires 215, and spiral strip 24 are in close contact. Silicone filler is poured into the interior of the plastic tube 23 through a glue injection tube 4.

[0060] Step 3: Installation of the flame-retardant structure. A spiral sheet 25 is sleeved on the outer surface of the plastic tube 23, and the spiral strip 24 is firmly connected to the inner side of the spiral sheet 25 by welding. A heat-shrinkable tube 26 is sleeved on the outer surface of the spiral sheet 25. The bottom of a metal hose 6 passes through an extension strip 27 for fixation. Two support assemblies 51 move towards each other and are sleeved on the outer surface of the heat-shrinkable tube 26. The two support assemblies 51 are tightly connected by bolts. Subsequently, a fire detector 52 is fixedly installed on the outer surface of the support assembly 51.

[0061] Step 4: Glue injection, shaping, and sealing. An end panel 3 seals and fixes the end position of the heat-shrinkable tube 26. A control valve 61 is installed on the top of the metal hose 6. The input end of the control valve 61 extends into the interior of the metal hose 6. When the component walls 511 are combined, the output end of the control valve 61 extends into the interior of the component wall 511 and is hermetically connected. The opposing component walls 511 are tightly connected by bolts. A special-shaped tube 7 is pulled and pressed into the interior of a special-shaped groove 513 and fixed by a pin. Silicone paint is poured into the interior of the special-shaped tube 7 through a glue injection hole 71. After the silicone paint cools and shapes, a sealed filling is achieved between the heat-shrinkable tube 26 and the special-shaped tube 7.

[0062] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the existence of additional identical elements in the process, method, article or device comprising said element.

Claims

1. A halogen-free fireproof and flame-retardant cable, comprising a wire core (1), characterized in that, The wire core (1) is composed of a stranded copper wire and a cross-linked polyethylene tube. There are six wire cores (1), and further includes: A cooling mechanism (2), the cooling mechanism (2) is fixedly installed on the outer surface of the wire core (1), an end panel (3) is fixedly connected to the end face position of the cooling mechanism (2), and a glue injection tube (4) is fixedly connected to the surface of the end panel (3); A flame retardant mechanism (5), the flame retardant mechanism (5) is fixedly installed on the outer surface of the cooling mechanism (2), a metal hose (6) is fixedly connected to the upper position of the inner side of the flame retardant mechanism (5), liquid carbon dioxide flows inside the metal hose (6), an irregular tube (7) is fixedly connected to the end face position of the flame retardant mechanism (5), and a glue injection hole (71) is opened at the top of the irregular tube (7); A ventilation assembly (8), the ventilation assembly (8) is fixedly installed on the outer surface of the irregular tube (7), and the ventilation assembly (8) is used for drying the gas outside the cable and introducing and transporting the dried gas; Wherein the cooling mechanism (2) includes a centering assembly (21), the inner side surface of the centering assembly (21) is fixedly connected to the surface of the wire core (1), a plastic tube (23) is fixedly connected to the surface of the centering assembly (21), a spiral strip (24) is fixedly connected inside the plastic tube (23), a spiral fin (25) is welded and fixed on the outer surface of the spiral strip (24), and a heat shrinkable tube (26) is fixedly connected to the outer surface of the spiral fin (25).

2. The halogen-free fireproof and flame-retardant cable according to claim 1, wherein: A hemp rope (22) is fixedly connected to the middle position of the inner side surface of the centering assembly (21), an extension strip (27) is fixedly connected to the surface of the spiral fin (25), and a cutting groove (231) is opened on the surface of the plastic tube (23).

3. The halogen-free fireproof and flame-retardant cable according to claim 2, characterized in that: The centering assembly (21) includes a circular tube (211), a partition plate (212) is fixedly connected to the surface of the circular tube (211), a winding strip (214) is fixedly connected to the inner side surface of the circular tube (211), and through holes (213) are opened on the surfaces of the circular tube (211) and the partition plate (212).

4. The halogen-free fireproof and flame-retardant cable according to claim 3, wherein: The centering assembly (21) includes an embedded wire (215), the surface of the embedded wire (215) is fixedly installed on the outer surface of the winding strip (214) by gluing, and the surface of the embedded wire (215) away from the winding strip (214) is fixedly installed on the inner side surface of the spiral strip (24) by gluing.

5. A halogen-free fireproof and flame-retardant cable according to claim 1, characterized in that: The flame retardant mechanism (5) includes a support assembly (51), the support assembly (51) is fixedly installed on the outer surfaces of the heat shrinkable tube (26) and the metal hose (6), and a fire detector (52) is fixedly connected to the position near the middle of the surface of the support assembly (51).

6. The halogen-free fireproof and flame-retardant cable according to claim 5, wherein: The number of the support assemblies (51) is two, and the two support assemblies (51) are tightly connected by bolts. The bottom of the support assembly (51) is fixedly connected with an arc plate (53), and a ball (54) is rotatably connected to the inner side surface of the arc plate (53).

7. The halogen-free fireproof and flame-retardant cable according to claim 6, wherein: The support assembly (51) includes a component wall (511). A side plate (512) is fixedly connected to the end face position of the component wall (511). A special-shaped groove (513) is formed on the surface of the side plate (512). The end face of the special-shaped pipe (7) is embedded into the inside of the special-shaped groove (513) and fixed by a pin.

8. A halogen-free fireproof and flame-retardant cable according to claim 7, characterized in that: A first arc surface (517) and a second arc surface (518) are respectively arranged on the surface of the component wall (511). The first arc surface (517) is in close contact with the outer surface of the metal hose (6). The second arc surface (518) is in close contact with the outer surface of the heat shrinkable tube (26).

9. The halogen-free fireproof and flame-retardant cable according to claim 8, characterized in that: A flow cavity (514) is formed inside the component wall (511). An overflow hole (515) is formed on the surface of the component wall (511). A rubber plug (516) is in interference fit at a position of the component wall (511) close to the overflow hole (515). A control valve (61) is fixedly connected to the upper position of the inner side surface of the component wall (511).

10. A preparation method of a halogen-free fireproof and flame-retardant cable, characterized in that: Including the following steps: Step 1: Conductor core manufacturing. At room temperature, a copper bar is drawn into a copper wire. The copper wire is heated up and kept warm, and then naturally cooled. The copper wire is stranded in a stranded manner with multiple single wires to form a copper stranded wire. A traction machine is used to draw the copper stranded wire to be coated into an injection extrusion machine to coat a heat-melt cross-linked polyethylene material. After cooling and shaping, a core (1) is formed. Subsequently, the manufacturing of multiple cores (1) is completed in sequence. Step 2: Centering structure installation. The embedding wire (215), the partition plate (212), and the round tube (211) form a first integral structure. The spiral strip (24) and the plastic pipe (23) form a second integral structure. The winding strip (214) is inserted into the inner side surface of the first integral structure. The hemp rope (22) is passed through the inner side surface of the winding strip (214). The second integral structure is sleeved on the outside of the first integral structure. The winding strip (214), the embedding wire (215), and the spiral strip (24) are in close contact. Silicone filler is poured into the inside of the plastic pipe (23) through a glue injection pipe (4). Step 3: Flame-retardant structure installation. The spiral sheet (25) is sleeved on the outer surface of the plastic pipe (23). The spiral strip (24) is firmly connected to the inner side surface of the spiral sheet (25) by welding. The heat shrinkable tube (26) is sleeved on the outer surface of the spiral sheet (25). The bottom of the metal hose (6) is fixed by passing through the extension strip (27). Two support assemblies (51) move towards each other and are sleeved on the outer surface of the heat shrinkable tube (26). The two support assemblies (51) are firmly connected by bolts. Subsequently, the open flame detector (52) is fixedly installed on the outer surface of the support assembly (51). Step 4, Glue injection, shaping and sealing: The end face of the heat shrinkable tube (26) is sealed and fixed by the end face plate (3). The control valve (61) is installed at the top of the metal hose (6). The input end of the control valve (61) extends into the interior of the metal hose (6). When the component walls (511) are joined, the output end of the control valve (61) extends into the interior of the component wall (511) and is hermetically connected. The opposing component walls (511) are fastened by bolts. The special-shaped tube (7) is pulled and pressed into the interior of the special-shaped groove (513) and fixed by a pin. Silicone paint is poured into the interior of the special-shaped tube (7) through the glue injection hole (71). After the silicone paint cools and takes shape, a sealed filling is achieved between the heat shrinkable tube (26) and the special-shaped tube (7).

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