A high temperature resistant flame retardant cable

Abstract

The present invention discloses a high temperature resistant flame retardant cable, and relates to the field of cable flame retardant technology. The cable comprises a high temperature resistant flame retardant cable, comprising a cable core, an insulating layer, a filler, a flame retardant layer and a sheath, an insulating layer is provided with a heat insulation component on the outer side, and a plurality of heat insulation components are provided with a support component at both ends; the heat insulation component comprises an open ring, a telescopic tube is slidably connected in the open ring, and a sealing sliding part is provided at the bottom of the telescopic tube; the support component comprises a bracket, and a plurality of cutting components are provided in an annular array on the bracket. The present invention blocks the external fire source outside the flame retardant layer through the mutual cooperation of the support component, the cutting component and the heat insulation component, and at the same time forms a seal inside the cable to isolate the entry of gas and prevent the problem of secondary fire of the cable, and actively detaches the flame retardant layer when the flame retardant layer is attached to the fire source for a long time through the above device, thereby separating the fire source on the flame retardant layer from the cable, and preventing the fire source from passing through the flame retardant layer and igniting the cable.

Description

Technical Field

[0001] The invention relates to the technical field of cable flame retardancy, and in particular to a high temperature resistant flame retardant cable. Background Art

[0002] Flame-retardant cable is a cable designed to improve the safety of power lines. It is made of special flame-retardant materials, which can effectively suppress the spread of flames when contacted by a fire source, reducing the risk of fire. This cable not only has excellent fire resistance, but also reduces the release of toxic smoke and harmful gases during combustion, protecting personnel safety.

[0003] The Chinese patent application number CN201810947221.8 discloses a highly flame-retardant and high-temperature resistant cable, including a cable body and a connector assembly. The cable body includes a flame-retardant protective sleeve, and a plurality of heat dissipation holes are arranged in the side wall of the flame-retardant protective sleeve. The flame-retardant protective sleeve provided in the invention can effectively prevent the spread of fire and improve the flame-retardant performance of the cable, but the flame-retardant effect of the above invention on the fire source is poor.

[0004] A Chinese invention patent with application number CN201910512588.1 discloses a flame-retardant cable. The flame-retardant powder is obtained by compounding alkalized fly ash and modified zirconium hydrogen phosphate powder. It is mainly composed of a composite flame retardant and supplemented by zirconium hydrogen phosphate. The price is lower, but the above invention cannot completely separate the fire source from the cable. The cable will still be damaged under long-term burning.

[0005] However, by providing a flame retardant layer on the outside of the cable core, although the problem of the cable burning due to external fire during actual use is solved, the heat dissipation performance of the cable core is reduced due to the flame retardant layer wrapped on the outside of the cable core, which causes the cable core temperature to rise abnormally and spontaneously combust when the cable works for a long time.

[0006] When the cable core temperature is too high due to excessive load or long-term operation, although the fire time can be delayed by setting a flame retardant layer, the cable core where the abnormality occurs cannot be marked, resulting in subsequent maintenance personnel being unable to accurately locate the abnormal area when troubleshooting the cable abnormality.

[0007] Moreover, in the prior art, solid flame retardant materials and cable cores are usually fixed and filled with adhesives. When the cables are arranged, the cables are usually required to be bent in some areas, resulting in gaps between the cable core and the solid flame retardant materials in the bent areas. When a fire occurs externally, this area will not be able to effectively protect the cables. At the same time, existing flame retardant cables cannot effectively separate the fire source from the cable. When the flame retardant layer of the cable burns for a long time, the cable will still be damaged if the fire is not extinguished manually.

[0008] Therefore, it is necessary to invent a high temperature resistant flame retardant cable to solve the above problems. Summary of the invention

[0009] The object of the present invention is to provide a high temperature resistant flame retardant cable to solve the problems raised in the above background technology.

[0010] To achieve the above object, the present invention provides the following technical solution: a high temperature resistant flame retardant cable, comprising a cable core, an insulating layer, a filler, a flame retardant layer and a sheath, wherein a heat insulation component is sheathed on the outer side of the insulating layer, and a support component is provided at both ends of the plurality of heat insulation components;

[0011] The heat insulation assembly comprises an open ring, a telescopic tube is slidably connected inside the open ring, and a sealing sliding member is provided at the bottom of the telescopic tube;

[0012] The support assembly comprises a bracket, a plurality of slitting assemblies are arranged in a ring array on the bracket, the slitting assemblies are connected with a plurality of open rings through the bracket, and a plurality of sliding members are arranged on the bracket.

[0013] Preferably, each of the cable cores is composed of a plurality of conductive wires wound around each other, and an insulating layer is coated on the outside of each of the cable cores. The plurality of support components are arranged at intervals, and the cable core passes through the plurality of support components in sequence.

[0014] Preferably, the thermal insulation assembly also includes a connecting port, which is opened in the middle of the open ring, and the open ring is connected to the inside of the bracket through the connecting port, and the two sealing sliding parts divide the inside of the open ring into a heat exchange part connected to the connecting port and a sliding part connected to the telescopic tube.

[0015] Preferably, a plurality of heat conducting plates are provided on the open ring in a linear array, and the heat conducting plates are connected to the heat exchange part in the open ring, and a heat insulating layer is provided on one side of the open ring close to the cable core.

[0016] Preferably, the support assembly also includes a heat exchange chamber interconnected with the heat insulation assembly, the heat exchange chamber is located inside the bracket, a hoop is provided on the outside of the bracket, a limit block is provided in the heat exchange chamber, the top of the limit block is connected to the bottom of the sliding member, and a plurality of air outlet holes are arranged in an array around the sliding member.

[0017] Preferably, the slitting assembly includes a limit frame, and the front and rear ends of each limit frame are connected to the interior of the support assembly. A sliding block is provided inside the limit frame, and a T-shaped block is provided at the end of the sliding block. The T-shaped block and the limit block limit each other.

[0018] Preferably, a cutter is provided at the bottom of the sliding block, connecting grooves are opened on both sides of the limit frame below the cutter, and each limit frame below the cutter is provided with a connecting strip, which passes through the connecting grooves on both sides of the limit frame and is connected to the flame retardant layer.

[0019] Preferably, the telescopic tube is filled with an inert gas, and the telescopic tube is made of a high-temperature resistant material with elastic deformation capability.

[0020] Preferably, a through hole is opened on the top of the limit block, two opening and closing plates are symmetrically arranged above the through hole, connecting plates are arranged at the bottom of the two opening and closing plates, and the two connecting plates are connected by a spring, and the two opening and closing plates are connected by a connecting rod.

[0021] Preferably, the connecting rod is made of flammable material, and the two springs are in a stretched state in an initial state. When the connecting rod is burned off, the two springs pull the two opening and closing plates closer to each other.

[0022] Technical effects and advantages of the present invention:

[0023] 1. The present invention has a telescopic tube slidably connected in an open ring, and a sealing sliding part is provided at the bottom of the telescopic tube. When the cable temperature rises due to excessive load or long-term operation, the high-temperature expanding gas pushes the two sealing sliding parts away from each other and squeezes the telescopic tube to expand the telescopic tube, thereby causing a bulge to appear at the place where the cable temperature is too high, marking the abnormal cable temperature, so that subsequent maintenance personnel can check the cable abnormality.

[0024] 2. The present invention connects the heat exchange parts in multiple open rings with the heat exchange cavity by setting a connecting port in the middle of the open ring. When the temperature of a certain cable core rises abnormally in the working state, the gas in the heat exchange cavity corresponding to the cable core will expand due to the heat, and the expanded gas will enter the heat exchange cavity through the connecting port, thereby pushing the sliding part arranged in the heat exchange cavity to move away from the middle of the heat exchange cavity, so that the air outlet provided on the sliding part is connected with the outside, and the high-temperature gas is discharged to the outside through the air outlet, which effectively reduces the temperature inside the cable, further improves the heat dissipation effect of the device, and avoids the problem of abnormal operation of the cable core caused by excessive internal temperature of the cable.

[0025] 3. The present invention blocks external fire sources outside the flame retardant layer through the mutual cooperation of the supporting component, the cutting component and the heat insulation component, and at the same time forms a seal inside the cable to isolate the entry of gas and prevent the problem of secondary fire of the cable. In addition, when the flame retardant layer is attached to the fire source for a long time, the above-mentioned device can actively detach the flame retardant layer, thereby separating the fire source on the flame retardant layer from the cable, preventing the fire source from passing through the flame retardant layer and igniting the cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0027] Figure 2 It is a schematic diagram of the overall structure of the present invention from another angle.

[0028] Figure 3 It is a schematic diagram of the explosion of the internal structure of the present invention.

[0029] Figure 4 It is a schematic diagram of the explosion structure of the thermal insulation component of the present invention.

[0030] Figure 5 It is a schematic diagram of the connection between the support component and the cutting component of the present invention.

[0031] Figure 6 It is a schematic diagram of the interior of the stent of the present invention in half section.

[0032] Figure 7 For the present invention Figure 6 Schematic diagram of the mechanism structure at A in the middle.

[0033] Figure 8 It is a schematic diagram of the connection between the slitting assembly and the flame retardant layer of the present invention.

[0034] Fig. 9 For the present invention Figure 8 Schematic diagram of the mechanism structure at B in the middle.

[0035] Fig.10 It is an exploded schematic diagram of the internal structure of the limit block of the present invention.

[0036] In the figure: 1. cable core; 2. insulation layer; 3. filler; 4. flame retardant layer; 5. thermal insulation component; 51. open ring; 52. telescopic tube; 53. sealing sliding part; 54. connecting port; 55. heat conductive plate; 6. support component; 61. bracket; 62. sliding part; 63. heat exchange chamber; 64. hoop; 65. limit block; 66. vent; 67. opening and closing plate; 68. connecting plate; 69. connecting rod; 610. spring; 7. cutting component; 71. limit frame; 72. sliding block; 73. cutter; 74. connecting strip; 75. T-block; 8. leather cover. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example 1

[0038] The present invention provides Figure 1-6 A high-temperature resistant flame-retardant cable is shown, comprising a cable core 1, an insulating layer 2, a filler 3, a flame-retardant layer 4 and a sheath 8. A heat-insulating component 5 is sheathed on the outside of the insulating layer 2. A support component 6 is provided at both ends of the multiple heat-insulating components 5. The multiple support components 6 are arranged at intervals. The cable core 1 passes through the multiple support components 6 in sequence. Each cable core 1 is composed of multiple conductive wires intertwined with each other, and the outside of each cable core 1 is coated with an insulating layer 2. The multiple groups of cable cores 1 are insulated by the setting of the insulating layer 2, thereby ensuring that the current can only propagate along the wire and will not flow to the outside and avoid the interference of the current or electromagnetic field in the external environment on the cable core 1.

[0039] At the same time, through the design of the flame retardant layer 4, when a fire occurs in the outside, the fire source is effectively separated from the cable core 1, and the ignition time of the cable core 1 is slowed down.

[0040] It should be noted that the cable is composed of multiple groups of cable cores 1, and each cable core 1 covered by an insulating layer 2 is provided with an insulating component 5 on the outside. The insulating component 5 is arranged on the outside of the insulating layer 2 and is in contact with the insulating layer 2. A supporting component 6 is provided at both ends of the multiple groups of insulating components 5. The multiple groups of insulating components 5 are wrapped and fixed by a flame retardant layer 4, and the gaps between the flame retardant layer 4 and the insulating components 5 are filled with fillers 3, thereby ensuring that the outer diameter of the cable is relatively round, while improving the flexibility and moisture resistance of the cable, and further improving the deformation resistance of the cable through the provision of multiple supporting components 6.

[0041] like Figure 4As shown, the heat insulation assembly 5 includes an open ring 51, a telescopic tube 52 is slidably connected inside the open ring 51, a sealing sliding member 53 is provided at the bottom of the telescopic tube 52, and the two sealing sliding members 53 divide the inside of the open ring 51 into a heat exchange portion and a sliding portion connected to the telescopic tube 52. The open ring 51 is divided into a sealed heat exchange portion and a sliding portion connected to the telescopic tube 52 by the two sealing sliding members 53. Since the open ring 41 and the insulating layer 2 are in contact with each other, when the cable temperature rises due to excessive load or long-term operation, the cable core 1 releases the temperature to the outside through the insulating layer 2. In this state, since the open ring 51 and the insulating layer 2 are in contact with each other, and the thermal conductivity of the solid is higher than that of the gas. Therefore, the temperature inside the open ring 51 will rise first, and the insulating layer 2 that is not in contact with the open ring 51 will conduct heat through the air to heat up the gas in the telescopic tube 52. At this time, since the heat exchange part inside the open ring 51 is a sealed structure, when the temperature inside the heat exchange part gradually rises, the gas inside it will expand and push the two sealing sliding members 53 away from each other. At this time, the two sealing sliding members 53 will squeeze the telescopic tube 52 to compress the gas inside it. At the same time, due to the temperature released by the insulating layer 2 to the outside, the gas in the telescopic tube 52 will expand after absorbing heat, thereby causing bulges to appear at the places where the cable temperature is too high, thereby marking the abnormal cable temperature places, which is convenient for subsequent maintenance personnel to check the cable abnormalities.

[0042] When the cable short-circuit catches fire due to excessive load or long-term operation, the cable core 1 will catch fire first and burn the insulating layer 2 covering the outside of the cable core 1, so that the flame directly contacts the telescopic tube 52 covering the outside of the insulating layer 2 and burns the telescopic tube 52, thereby releasing the inert gas arranged in the telescopic tube 52, thereby isolating the air in the fire area from the fire source, and at the same time extinguishing the fire source in the fire area by the filler 3 filled to the outside of the thermal insulation component 5, effectively solving the problem in the prior art that the flame-retardant cable can only protect the cable when an external fire occurs, but cannot protect the cable when an internal fire occurs.

[0043] Furthermore, by providing a heat insulating component 5 between the filler 3 and the insulating layer 2, the interior of the cable is not a solid structure. When the cable is abnormally ignited due to the cable core 1, the hollow area formed by the heat insulating component 5 in the filler 3 will buffer the fire source to a certain extent, thereby preventing the cable core 1 from directly burning the cable and causing external fire.

[0044] Finally, when the cable needs to be bent during routing, through the arrangement of the insulation component 5, the support component 6 and the filler 3, since the main body of the insulation component 5 is composed of the open ring 51 and the telescopic tube 52, and the telescopic tube 52 has a certain deformation ability, when the cable is bent, the filler 3 in the bending area will squeeze the telescopic tube 52 under the action of the external squeezing force, so that the inert gas in the telescopic tube 52 pushes the telescopic tube 52 to extend into the fixed ring 51 under the action of the squeezing force, thereby ensuring that the insulation component 5 of the cable can still effectively protect the cable core 1 in the bent state. At the same time, when the telescopic tube 52 is squeezed, since the force is mutual, it can squeeze the filler 3 to a certain extent, thereby avoiding the formation of gaps in the filler 3 in the bending area, resulting in the filler 3 in the area being unable to effectively protect the cable when a fire occurs outside.

[0045] It should be noted that when the temperature inside the cable rises and an internal short circuit causes a fire, no matter whether the gas expansion in the heat exchange part of the open ring 51 is sufficient to push the two sealing sliding parts 53 away from each other, the gas in the telescopic tube 52 can be expanded and a bulge can appear at the place where the cable temperature is too high. The reason is as follows: According to the basic properties of gas and the basic principles of thermodynamics, in a closed container, when the gas is heated and other conditions remain unchanged, the molecular motion intensifies, but the average distance between molecules does not decrease significantly, so the gas will expand to accommodate more violent molecular motion. Therefore, even if the sealing sliding part 53 cannot push the telescopic tube 52 to shrink, the inert gas in the telescopic tube 52 will still expand in a high temperature environment, causing a bulge to appear at the place where the cable temperature is too high.

[0046] A plurality of heat conducting sheets 55 are provided on the open ring 51 in a linear array, and the heat conducting sheets 55 are connected to the heat exchange part in the open ring 51. A heat insulating layer is provided on the side of the open ring 51 close to the cable core 1. By means of the plurality of heat conducting sheets 55 provided on the open ring 51 and the heat insulating layer provided between the open ring 51 and the cable core 1, when high temperature occurs in the cable core 1, the heat source is concentratedly conducted to the heat exchange part through the heat conducting sheets 55, thereby ensuring that the gas in the heat exchange part will expand first due to the heat, and push the telescopic tube 52 to contract, so that the inert gas in the telescopic tube 52 drives the telescopic tube 52 to expand outward under the extrusion action, thereby ensuring that the bulge in the abnormal temperature area of ​​the cable can be clearly reflected.

[0047] When in use, a plurality of conductive wires are intertwined to form a cable core 1 and an insulating layer 2 is sheathed on the outside of the cable core 1, thereby ensuring that the current can only propagate along the wire and will not flow to the outside, thereby avoiding interference of the current or electromagnetic field in the external environment on the cable core 1. In addition, a heat insulation component 5 is provided on the outside of the insulating layer 2 to utilize the high temperature generated by the cable core 1 under abnormal conditions to expand the heat insulation component 5, thereby causing bulges to appear in the abnormal temperature area of ​​the cable to facilitate subsequent maintenance personnel to inspect the cable. At the same time, the heat insulation component 5 is used to effectively extinguish the fire in the fire area of ​​the cable core 1, thereby avoiding the problem of the cable core 1 spreading to the outside world and causing a fire after the fire occurs. Example 2

[0048] However, by providing the flame retardant layer 4 on the outside of the cable core 1, although the problem of the cable burning due to external fire during actual use is solved, since the flame retardant layer 4 is wrapped around the outside of the cable core 1, the heat dissipation performance of the cable core 1 is reduced, so that the temperature of the cable core 1 rises abnormally when the cable works for a long time, resulting in spontaneous combustion.

[0049] Therefore, in order to solve the above technical problems, the device also includes: a connecting port 54 arranged in the middle of the open ring 51, and a support assembly 6 arranged at both ends of the insulation assembly 5, the support assembly 6 includes a bracket 61, and a plurality of sliding members 62 are arranged on the bracket 61, and the open ring 51 is interconnected with the inside of the bracket 61 through the connecting port 54. The support assembly 6 also includes a heat exchange chamber 63 interconnected with the insulation assembly 5, the heat exchange chamber 63 is located inside the bracket 61, a hoop ring 64 is provided on the outside of the bracket 61, and a limit block 65 is provided in the heat exchange chamber 63. The top of the limit block 65 is connected to the bottom of the sliding member 62, and a plurality of air outlet holes 66 are arranged in an array around the sliding member 62.

[0050] First, a hoop 64 is provided on the outside of the bracket 61, and the multiple cable cores 1 are divided into zones. For ease of description, an example is given in which four cable cores 1 are provided in the cable. If the number of cable cores 1 in the cable is 4, the bracket 61 is provided as a "cross"-shaped bracket, thereby dividing the interior of the cable into four equal areas. A cable core 1 is provided in each area, and fillers 3 are filled in the gaps on the outside of multiple insulation components 5 coated with the cable cores 1, thereby dividing the multiple cable cores 1 into zones, effectively avoiding the problem that the temperature of the cable abnormally increases due to the mutual heat dissipation of the multiple cable cores 1 when working, which is not conducive to heat dissipation.

[0051] Secondly, by setting a connecting port 54 in the middle of the open ring 51, the heat exchange parts in the multiple open rings 51 are connected with the heat exchange cavity 63. When the temperature of a certain cable core 1 rises abnormally in the working state, the gas in the heat exchange cavity 63 corresponding to the cable core 1 here will expand due to the heat, and the expanded gas will enter the heat exchange cavity 63 through the connecting port 54, and squeeze the gas in the heat exchange cavity 63, thereby pushing the sliding member 62 arranged in the heat exchange cavity 63 to move away from the middle of the heat exchange cavity 63, so that the air outlet 66 arranged on the sliding member 62 is connected with the outside. At this time, the high-temperature gas in the heat exchange cavity 63 will be discharged outward through the air outlet 66, which effectively reduces the temperature inside the cable, further improves the heat dissipation effect of the device, and avoids the problem of abnormal operation of the cable core 1 due to excessive internal temperature of the cable.

[0052] If the amount of gas discharged from the air outlet 66 is less than the amount of gas expansion due to heat in the heat exchange part, part of the gas will pass through the heat exchange cavity 63 to increase the gas temperature in the insulation component 5 in the rest of the area, thereby balancing the overall temperature of the area and avoiding abnormal problems caused by excessive temperature of a certain cable core 1. At the same time, due to the increase in temperature here, the multiple telescopic tubes 52 here expand under the push of the sealing sliding part 53 and the conduction of heat, causing the cable here to bulge, alerting the maintenance personnel.

[0053] Finally, since two adjacent support components 6 are connected through the insulation component 5, when the temperature of the cable is too high at a certain point and the temperature continues to rise after heat dissipation through the above operation, the heat is conducted to the multiple support components 6 through the multiple insulation components 5, and the sliding parts 62 on the multiple support components 6 are pushed outward, so that the multiple air outlets 66 are connected to the outside world, further improving the heat dissipation effect of the device. Example 3

[0054] Since existing flame-retardant cables cannot effectively separate the fire source from the cable, when the flame-retardant layer of the cable burns for a long time, the cable will still be damaged if the fire is not extinguished manually.

[0055] Therefore, in order to solve the above technical problem, the device also includes: a plurality of slitting components 7 are arranged in a circular array on the bracket 61, and the slitting components 7 are connected with the plurality of open rings 51 through the bracket 61. The slitting components 7 include limit frames 71, and the front and rear ends of each limit frame 71 are connected with the inside of the support component 6. A sliding block 72 is arranged inside the limit frame 71, and a T-shaped block 75 is arranged at the end of the sliding block 72. The T-shaped block 75 and the limit block 65 limit each other. A cutter 73 is arranged at the bottom of the sliding block 72. The limit frame 71 is located below the cutter 73 and has connecting grooves on both sides, and each limit frame 71 is located below the cutter 73. A connecting strip 74 is provided at the bottom, and the connecting strip 74 passes through the connecting grooves on both sides of the limit frame 71 and is connected to the flame retardant layer 4. A through hole is provided on the top of the limit block 65, and two opening and closing plates 67 are symmetrically provided above the through hole. A connecting plate 68 is provided at the bottom of the two opening and closing plates 67, and the two connecting plates 68 are connected by a spring 610. The two opening and closing plates 67 are connected by a connecting rod 69, and the connecting rod 69 is composed of flammable material. The two springs 610 are in a stretched state in the initial state. When the connecting rod 69 is burned, the two springs 610 pull the two opening and closing plates 67 closer to each other.

[0056] First, by setting a sliding block 72 inside the limit frame 71, and setting T-shaped blocks 75 at the ends of both sides of the sliding block 72, the T-shaped block 75 and the limit block 65 are mutually engaged and limited. Specifically, when the cable is at room temperature, the sliding member 62 will slide freely in the heat exchange cavity 63 under its own gravity and the placement angle of the cable. When the sliding member 62 slides toward the central area of ​​the heat exchange cavity 63, the sliding member 62 will push the limit block 65 to slide synchronously. At this time, the setting of the T-shaped block 75 is used to limit the sliding member. The sliding stroke of the movable member 62 is limited to prevent the sliding member 62 from sliding to the middle of the heat exchange chamber 63, which may make it difficult for the subsequent sliding member 62 to leak out of the cable surface. When a certain area inside the cable is in a high temperature state, the sliding member 62 will move away from the center area under the push of the hot air. At this time, the sliding block 72 is limited by the setting of the T-block 75 and the sliding block 72 to prevent the sliding block 72 from driving the cutter 73 to move downward and squeeze the connecting strip 74, resulting in the flame retardant layer 4 breaking prematurely and causing the cable to lose its flame retardant effect.

[0057] Secondly, when a fire occurs outside, the fire source falling on the cable is flame-retarded by the flame-retardant layer 4 arranged on the outside of the heat-insulating component 5. When the fire source contacts the flame-retardant layer 4, it means that the leather cover 8 wrapped on the outside of the flame-retardant layer 4 has been ignited. At this time, the heat-insulating component 5 and the filler 3 arranged inside the flame-retardant layer 4 are used to insulate the high temperature outside. In this state, the temperature outside the flame-retardant layer 4 is higher than the temperature inside the flame-retardant layer 4, and due to the arrangement of the bracket 61 and the hoop 64, the high temperature outside is conducted to the heat exchange cavity 63, so that the gas temperature in the heat exchange cavity 63 increases and pushes the sliding member 62. Move upward to open the connection between the air outlet 66 on the sliding part 62 and the outside world. At this time, the fire source of the burning leather sheath 8 will enter the heat exchange chamber 63 through the air outlet 66 when spreading to the hoop 64, and ignite the connecting rod 69. When the connecting rod 69 is ignited, the two opening and closing plates 67 will lose the support of the connecting rod 69 and close under the elastic force of the spring 610, blocking the external fire source on the outside of the opening and closing plates 67, and at the same time completely cutting off the connection between the heat exchange chamber 63 and the outside world, thereby avoiding the problem of the fire source entering the cable along the heat exchange chamber 63 and causing fire inside the cable, further improving the flame retardant effect of the cable.

[0058] It should be noted that a stopper is provided on the heat exchange chamber 63 to prevent the sliding member 62 from separating therefrom, and the sliding member 62 and the limit block 65 are connected by an adhesive. When a fire occurs outside and the temperature of the connecting area in the heat exchange chamber 63 is too high, the sliding member 62 and the limit block 65 will separate from each other.

[0059] Finally, when the external fire is not extinguished for a long time, the opening and closing plates 67 are closed to each other, so that the heat exchange chamber 63 is divided into a sealed area in the middle and a connecting area outside the opening and closing plates 67. Since the connecting area outside the opening and closing plates 67 is connected to the outside, the temperature of this area is higher than the internal temperature. The gas in this area will expand and push the limit block 65 downward. At the same time, when the fire source is attached to the flame retardant layer 4 for a long time, the temperature of the flame retardant layer 4 will gradually increase and be transmitted to the inside of the cable, so that the gas temperature in the heat exchange chamber 63 in the bracket 61 gradually increases and expands. At this time, since the opening and closing plates 67 are in In the sealed state, the gas in the heat exchange chamber 63 cannot be discharged outward, so the gas in the heat exchange chamber 63 will enter the open ring 51 through the connecting port 54 and push the two sealing sliding parts 53 away from each other to squeeze the telescopic tube 52 to make the telescopic tube 52 expand outward, thereby making the flame retardant layer 4 arranged on the outside of the telescopic tube 52 move in the direction away from the center of the cable, and drive the connecting strip 74 to contact with the cutter 73 and cut off the connecting strip 74, thereby separating the flame retardant layer 4 from the cable, and separating the fire source adsorbed on the flame retardant layer 4 from the cable, effectively avoiding the problem of secondary fire caused by the fire source adsorbed on the cable causing the cable temperature to continue to rise.

[0060] It should be particularly noted that the present invention arranges a heat insulation component 5 and a support component 6 in the flame retardant layer 4. When the internal temperature of the cable rises abnormally, the high-temperature internal gas expands and pushes the sliding member 62 to slide outward to connect the inside of the cable with the outside, thereby achieving rapid cooling of the cable. At the same time, the expanding gas causes the heat insulation component 5 to expand, thereby marking the cable in the temperature abnormal area, which is convenient for subsequent maintenance personnel to quickly find the abnormal location and deal with it. When a fire occurs outside, the support component 6 cooperates with the cutting component 7 and the heat insulation component 5 to block the external fire source outside the flame retardant layer 4, and at the same time, a seal is formed inside the cable to isolate the entry of gas and prevent the problem of secondary fire of the cable. In addition, the above-mentioned device can actively detach the flame retardant layer 4 when the flame retardant layer 4 is attached to the fire source for a long time, thereby separating the fire source on the flame retardant layer 4 from the cable, and preventing the fire source from passing through the flame retardant layer 4 and igniting the cable.

[0061] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high temperature resistant flame retardant cable, comprising a cable core (1), an insulating layer (2), a filler (3), a flame retardant layer (4) and a sheath (8), characterized in that: Each of the cable cores (1) is composed of a plurality of conductive wires intertwined with each other, and each of the cable cores (1) is coated with an insulating layer (2) on the outside, and a heat insulation component (5) is provided on the outside of the insulating layer (2), and a plurality of the heat insulation components (5) are provided with a support component (6) at both ends, and the plurality of the support components (6) are arranged at intervals, and the cable core (1) passes through the plurality of support components (6) in sequence, and the plurality of the heat insulation components (5) are wrapped and fixed by a flame retardant layer (4), and the space between the flame retardant layer (4) and the heat insulation component (5) is filled with a filler (3), and the flame retardant layer (4) is wrapped with a leather cover (8) on the outside; The heat insulation component (5) comprises an open ring (51), a telescopic tube (52) is slidably connected inside the open ring (51), a sealing sliding member (53) is provided at the bottom of the telescopic tube (52), the telescopic tube (52) is filled with an inert gas, the telescopic tube (52) is composed of a high-temperature resistant material with elastic deformation capability, the heat insulation component (5) further comprises a connecting port (54), the connecting port (54) is opened in the middle of the open ring (51), and the open ring (51) is connected to the inside of the bracket (61) through the connecting port (54), and the two sealing sliding members (53) divide the inside of the open ring (51) into a heat exchange part connected to the connecting port (54) and a sliding part connected to the telescopic tube (52); When the cable is bent, since the main body of the heat insulation component (5) is composed of an open ring (51) and a telescopic tube (52), and the telescopic tube (52) can be deformed, when the cable is bent, the filler (3) in the bending area squeezes the telescopic tube (52) under the action of external squeezing force, so that the inert gas in the telescopic tube (52) pushes the telescopic tube (52) to extend into the open ring (51) under the action of squeezing force. At the same time, when the telescopic tube (52) is squeezed, since the force is mutual, it can squeeze the filler (3) to avoid the filler (3) from having gaps in the bending area, resulting in the filler (3) in the area being unable to effectively protect the cable when a fire occurs outside. The support assembly (6) comprises a bracket (61), a plurality of slitting assemblies (7) are arranged in a ring array on the bracket (61), the slitting assemblies (7) are connected to a plurality of open rings (51) via the bracket (61), and a plurality of sliding members (62) are arranged on the bracket (61).

2. The high temperature resistant flame retardant cable according to claim 1, characterized in that: A plurality of heat conducting sheets (55) are provided on the open ring (51) in a linear array, and the heat conducting sheets (55) are connected to a heat exchange portion in the open ring (51). A heat insulating layer is provided on a side of the open ring (51) close to the cable core (1).

3. The high temperature resistant flame retardant cable according to claim 1, characterized in that: The support assembly (6) further comprises a heat exchange cavity (63) interconnected with the heat insulation assembly (5); the heat exchange cavity (63) is located inside the bracket (61); a hoop (64) is provided on the outside of the bracket (61); a limit block (65) is provided inside the heat exchange cavity (63); the top of the limit block (65) is connected to the bottom of the sliding member (62); and a plurality of air outlet holes (66) are arranged in an array around the side of the sliding member (62).

4. The high temperature resistant flame retardant cable according to claim 3, characterized in that: The slitting assembly (7) comprises a limit frame (71), the front and rear ends of each limit frame (71) are connected to the interior of the support assembly (6), a sliding block (72) is provided inside the limit frame (71), and a T-shaped block (75) is provided at the end of each sliding block (72), and the T-shaped block (75) and the limit block (65) are mutually limited.

5. The high temperature resistant flame retardant cable according to claim 4, characterized in that: A cutter (73) is provided at the bottom of the sliding block (72), and connecting grooves are provided on both sides of the limit frame (71) below the cutter (73), and each limit frame (71) is provided with a connecting strip (74) below the cutter (73), and the connecting strip (74) passes through the connecting grooves on both sides of the limit frame (71) and is connected to the flame retardant layer (4).

6. The high temperature resistant flame retardant cable according to claim 5, characterized in that: A through hole is provided at the top of the limit block (65), and two opening and closing plates (67) are symmetrically provided above the through hole. A connecting plate (68) is provided at the bottom of the two opening and closing plates (67), and the two connecting plates (68) are connected via a spring (610). The two opening and closing plates (67) are connected via a connecting rod (69).

7. The high temperature resistant flame retardant cable according to claim 6, characterized in that: The connecting rod (69) is made of flammable material, and the two springs (610) are in a stretched state in an initial state. When the connecting rod (69) is burned off, the two springs (610) pull the two opening and closing plates (67) closer to each other.

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