Fireproof steel wire armored flame-retardant multi-core cable

Abstract

The invention relates to a fireproof steel wire armored flame-retardant multi-core cable, which relates to the field of cables, and comprises a plurality of conductors, an insulating layer, a shielding layer and an inner protective sleeve which are sequentially arranged on the outer side of each conductor in a sleeving manner, and a flame-retardant layer, an armored layer and an outer sheath layer which are sequentially and simultaneously arranged on the outer sides of the plurality of inner protective sleeves in a sleeving manner, the purification covers are arranged on the outer side of the outer sheath layer in a sleeving mode, the multiple purification covers are arranged at intervals in the length direction of the outer sheath layer, and the purification covers are communicated with the interior of the flame-retardant layer; the purification mechanism is arranged between the purification cover and the outer sheath layer and comprises an adsorption assembly, a pressure relief assembly and a fixing assembly, and the adsorption assembly is used for absorbing toxic gas and smoke particles in the flame-retardant layer; the pressure relief assembly is used for performing pressure relief treatment on pressure generated by high-temperature and high-pressure gas in the flame-retardant layer; the fixing assembly is used for fixing the purification cover to the outer side of the outer sheath layer. The fireproof cable has the advantages that the fireproof performance of the cable is improved, and meanwhile toxic gas and smoke particles generated during cable combustion are not prone to diffusion.

Description

Technical Field

[0001] This application relates to the field of cables, and in particular to a fire-resistant steel wire armored flame-retardant multi-core cable. Background Art

[0002] A cable is composed of one or more mutually insulated wires, with the characteristics of conducting electricity inside and being insulated outside. It is used to connect circuits, electrical appliances, etc., so as to transmit electrical energy or signals. It is widely used in fields such as power transmission, signal transmission, and control circuits, and is an indispensable part of urban infrastructure and industrial production.

[0003] Currently, a cable mainly includes a core conductor for transmitting current or signals, an insulating layer wrapped outside the conductor to prevent current leakage and short circuits (usually made of plastic, rubber, or other non-conductive materials), a shielding layer for reducing electromagnetic interference and radio frequency interference, an armored layer for providing additional mechanical protection (usually woven from steel wires or copper wires), an outer sheath layer for providing outer protection, and a filler for filling the internal voids of the cable; however, the insulating layer outside the internal conductor of the cable may be damaged locally due to the aging of the insulating layer or the thermal expansion and contraction effect caused by climate change, resulting in short circuits between conductors. When a short circuit occurs, the current increases sharply, generating a high-temperature electric arc and triggering combustion. During the combustion process, toxic gases such as hydrogen halide and a large number of smoke particles will be generated. These combustion products not only pollute the surrounding environment but also pose a threat to human health, such as irritating the respiratory tract and causing poisoning. In addition, the smoke particles can quickly reduce visibility, affecting personnel evacuation and rescue work and increasing the danger of fire. Summary of the Invention

[0004] In order to improve the fire resistance of the cable and at the same time make the toxic gases and smoke particles generated during the combustion of the cable not easily spread, this application provides a fire-resistant steel wire armored flame-retardant multi-core cable.

[0005] The fire-resistant steel wire armored flame-retardant multi-core cable provided by this application adopts the following technical solutions: A fire-resistant steel wire armored flame-retardant multi-core cable includes a plurality of conductors, an insulating layer, a shielding layer, an inner protective sleeve successively sleeved outside each of the conductors, and a flame-retardant layer, an armored layer, and an outer sheath layer successively and simultaneously sleeved outside a plurality of the inner protective sleeves; it further includes: Purifying covers, sleeved outside the outer sheath layer, and a plurality of them are spaced along the length direction of the outer sheath layer, and the purifying covers are internally connected to the flame-retardant layer; The purification mechanism is disposed between the purification cover and the outer sheath layer, and includes an adsorption component, a pressure relief component, and a fixing component. The adsorption component is used to absorb the toxic gases and smoke particles inside the flame retardant layer; the pressure relief component is used to relieve the pressure generated by the high-temperature and high-pressure gases inside the flame retardant layer; the fixing component is used to fix the purification cover to the outside of the outer sheath layer.

[0006] By adopting the above technical solutions, under normal working conditions, the multiple conductors of the cable are electrically isolated and protected through the insulating layer, the shielding layer, and the inner protective sleeve to ensure the stable transmission of current or signals. The flame retardant layer and the steel wire armor layer improve the fire resistance and mechanical strength of the cable, and the outer sheath layer provides physical protection. When the local insulating layer is damaged due to the aging of the insulating layer outside the conductor inside the cable or the thermal expansion and contraction effect caused by climate change, and a short circuit occurs between the conductors, resulting in the combustion of each structural layer inside the flame retardant layer, on the one hand, the flame retardant layer plays a role, making it difficult for the fire to spread to the outside of the flame retardant layer. On the other hand, through the coordinated cooperation of the flame retardant layer, the adsorption component, and the pressure relief component, the toxic gases and smoke particles such as hydrogen halide generated by each structural layer inside the flame retardant layer diffuse towards the adsorption component side and are absorbed by the adsorption component, making it difficult for the toxic gases and smoke particles to diffuse to the outside of the cable, thereby reducing the pollution to the surrounding environment and reducing the threat to human health, creating favorable conditions for personnel evacuation and rescue work. At the same time, the gas pressure inside the flame retardant layer will increase due to high temperature. At this time, the pressure relief component starts to work to relieve the pressure inside the flame retardant layer, preventing the cable from bursting locally due to excessive internal pressure and causing a large amount of air to rush in, thereby avoiding the intensification of the fire due to the supply of oxygen. Further, after the internal fire of the cable ends, when the staff disassembles and replaces the damaged cable, the purification cover can be removed from the damaged outer sheath layer of the cable through the fixing component and transferred and fixed to the outside of the new cable for reuse.

[0007] Optionally, the adsorption component includes: Adsorption chambers are disposed inside the purification cover and a plurality of them are arranged along the circumferential direction of the outer sheath layer. The adsorption chambers are filled with activated carbon; A rotating ring is rotatably connected to the outside of the purification cover, and an opening and closing door for opening or closing the adsorption chamber is provided on the rotating ring.

[0008] By adopting the above technical solution, when the cable is under normal working conditions, the opening and closing door of the adsorption component is in the closed state, and the activated carbon in the adsorption chamber does not come into contact with the external environment, maintaining its adsorption effect; when a fire occurs inside the cable and toxic gases and smoke particles are generated inside the flame retardant layer, the activated carbon in the adsorption chamber absorbs the toxic gases and smoke particles released from the inside of the flame retardant layer; when the activated carbon reaches saturation after multiple adsorptions or the adsorption effect drops significantly, the staff can open the opening and closing door and rotate the rotating ring, and then take out the activated carbon in each adsorption chamber one by one and replace it with new activated carbon to ensure the continuous effectiveness of the adsorption component.

[0009] Optionally, the pressure relief component includes: A pressure relief channel fixedly arranged outside the rotating ring; A pressure relief spring arranged inside the pressure relief channel, A plug fixedly arranged at one end of the pressure relief spring, and the pressure relief spring gives the plug a force for blocking the pressure relief channel.

[0010] By adopting the above technical solution, in the initial state, the plug of the pressure relief component blocks the pressure relief channel under the action of the pressure relief spring; the gas pressure inside the flame retardant layer will increase due to the high temperature of combustion. When the gas pressure inside the cable reaches a certain threshold, the internal pressure begins to exert a force on the plug. When the internal pressure exceeds the elastic force of the pressure relief spring, the plug is pushed, the pressure relief channel is opened, and the high-pressure gas inside the flame retardant layer is released, thereby reducing the internal pressure. When the internal pressure of the cable drops to the safe range, the elastic force of the pressure relief spring pushes the plug back to its original position to block the pressure relief channel and restore the sealed state inside the cable; among them, the pressure relief component controls the opening degree of the pressure relief channel by adjusting the position of the plug, realizes the dynamic adjustment of the internal pressure of the cable, and prevents the cable from bursting locally due to excessive internal pressure by timely pressure relief, avoiding a large amount of air from pouring in, thereby controlling the spread of the fire.

[0011] Optionally, a flexible pressure relief bag is arranged at one end of the pressure relief channel far away from the rotating ring.

[0012] By adopting the above technical solution, the flexible pressure relief bag is in a closed state, and together with the plug, it forms a double protection and isolation to jointly block the pressure relief channel and prevent external air from entering the cable; when the internal pressure of the cable increases due to abnormal conditions such as a fire and reaches the pressure threshold, the plug of the pressure relief component is pushed, the pressure relief channel is opened, and the high-pressure gas enters the flexible pressure relief bag through the pressure relief channel. The flexible pressure relief bag absorbs and buffers the high-pressure gas released from the inside of the cable through its elastic structure. At the same time, it can also isolate external air and prevent a large amount of oxygen from pouring in, thereby controlling the spread of the fire; further, even if the flexible pressure relief bag is damaged under extreme conditions, the plug can still continue to block the pressure relief channel and reduce the direct entry of external air into the cable.

[0013] Optionally, the purification mechanism further includes: A smoke sensing channel disposed on one side of the purification cover close to the outer sheath layer, and the smoke sensing channel communicates with the adsorption chamber; A smoke sensor disposed in the smoke sensing channel for detecting smoke particles and emitting a detection signal; A smoke alarm disposed outside the purification cover; A controller connected to the smoke sensor and the smoke alarm, configured to receive the detection signal to know that smoke particles are generated inside the cable, and simultaneously send a control signal to the smoke alarm to activate the smoke alarm.

[0014] By adopting the above technical solution, when a fire occurs inside the cable and generates smoke particles, the smoke particles enter the smoke sensor through the smoke sensing channel, triggering the smoke sensor to emit a detection signal. After receiving the detection signal from the smoke sensor, the controller judges the fire situation inside the cable and sends a control signal to the smoke alarm. After receiving the control signal from the controller, the smoke alarm is immediately activated to emit an alarm, reminding personnel to pay attention to the fire risk inside the cable; among them, through the real-time monitoring of the smoke sensor, early fire warning can be provided, winning precious time for personnel evacuation or cable repair work.

[0015] Optionally, interaction channels are opened along the length direction on the outside of the flame retardant layer, and a plurality of the interaction channels are arranged circumferentially along the flame retardant layer. Each of the interaction channels communicates with the inside of the flame retardant layer, and the interaction channels between adjacent purification mechanisms are communicated. Connection channels are opened on both the armor layer and the outer sheath layer, and the interaction channels are communicated with the smoke sensing channels through the connection channels.

[0016] By adopting the above technical solution, when toxic gases and smoke particles are generated due to a fire inside the cable, the toxic gases and smoke particles can smoothly flow to the smoke sensing channel through the interaction channels and the connection channels; and the interaction channels between adjacent purification mechanisms are interconnected to form an overall smoke circulation network, thereby improving the absorption and purification efficiency of toxic gases and smoke particles.

[0017] Optionally, a heat insulation layer is further provided between the flame retardant layer and the armor layer, and the connection channels are also opened on the heat insulation layer.

[0018] By adopting the above technical solution, the heat insulation layer is made of a material with high temperature resistance and low thermal conductivity, which can effectively prevent or slow down the transfer of heat from the inside of the cable to the outside, preventing the spread of fire to the outside of the cable.

[0019] Optionally, the fixing assembly includes: There are two fixing sleeves, and the two fixing sleeves are respectively arranged on both sides of the purification cover along the length direction of the outer sheath layer, and the fixing sleeves are sleeved on the outside of the outer sheath layer; A pipe clamp is sleeved on the outside of the fixing sleeve.

[0020] By adopting the above technical solution, when fixing the purification cover through the fixing component, the pipe clamp is sleeved on the outside of the fixing sleeve, and the pipe clamp is tightened so that sufficient friction is formed between the pipe clamp and the fixing sleeve, and at the same time, the fixing sleeve is closely attached to the outer sheath layer.

[0021] Optionally, the purification cover is rotatably connected to the fixing sleeve.

[0022] By adopting the above technical solution, the purification cover is rotatably connected to the fixing sleeve, so that the purification cover can rotate on the fixing sleeve. When it is necessary to pour or replace the activated carbon in the adsorption chamber, the staff can directly rotate the purification cover so that the adsorption chamber to be cleaned is facing downwards, so that the activated carbon in the adsorption chamber can be conveniently poured; when it is necessary to supplement the activated carbon in the adsorption chamber, the purification cover can be directly rotated so that the adsorption chamber is facing upwards, so that the newly added activated carbon in the adsorption chamber is not easily dropped from the opening and closing door.

[0023] Optionally, a plurality of sealing rings are fixedly arranged on the inner side of the fixing sleeve.

[0024] By adopting the above technical solution, a plurality of sealing rings can enhance the sealing performance between the inner side of the fixing sleeve and the outer sheath layer, preventing external environmental factors such as moisture and dust from invading the inside of the cable and affecting the normal operation and service life of the cable.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: When the local insulation layer is damaged due to the aging of the insulation layer outside the internal conductor of the cable or the thermal expansion and contraction effect caused by climate change, and a short circuit occurs between the conductors, causing the combustion of each structural layer inside the flame retardant layer, on the one hand, the flame retardant layer plays a role, making it difficult for the fire to spread to the outside of the flame retardant layer; on the other hand, through the coordinated cooperation of the flame retardant layer, the adsorption component and the pressure relief component, the toxic gases and smoke particles such as hydrogen halide generated by each structural layer inside the flame retardant layer diffuse to the side of the adsorption component and are absorbed by the adsorption component, making it difficult for the toxic gases and smoke particles to diffuse to the outside of the cable, thereby reducing the pollution to the surrounding environment and reducing the threat to human health, creating favorable conditions for personnel evacuation and rescue work; at the same time, the gas pressure inside the flame retardant layer will increase due to high temperature. At this time, the pressure relief component starts to work, relieving the pressure inside the flame retardant layer, preventing the cable from bursting locally due to excessive internal pressure and causing a large amount of air to rush in, thereby avoiding the intensification of the fire due to the supply of oxygen; When a fire breaks out inside the cable and toxic gases and smoke particles are generated inside the flame retardant layer, the activated carbon in the adsorption chamber absorbs the toxic gases and smoke particles emitted from the inside of the flame retardant layer; when the activated carbon reaches saturation after multiple adsorptions or the adsorption effect drops significantly, the staff can open the opening and closing door and rotate the rotating ring, and then take out the activated carbon in each adsorption chamber one by one and replace it with new activated carbon to ensure the continuous effectiveness of the adsorption component; The pressure relief component controls the opening degree of the pressure relief channel by adjusting the position of the plug, realizes the dynamic adjustment of the internal pressure of the cable, and prevents the cable from bursting locally due to excessive internal pressure through timely pressure relief, avoiding a large amount of air from pouring in, thereby controlling the spread of the fire; and the flexible pressure relief bag is in a closed state, cooperating with the plug to form a double protection isolation to jointly block the pressure relief channel and prevent external air from entering the cable; when the internal pressure of the cable rises due to abnormal conditions such as fire and reaches the pressure threshold, the plug of the pressure relief component is pushed, the pressure relief channel is opened, and the high-pressure gas enters the flexible pressure relief bag through the pressure relief channel. The flexible pressure relief bag absorbs and buffers the high-pressure gas released from the cable through its elastic structure. At the same time, it can also isolate external air and prevent a large amount of oxygen from pouring in, thereby controlling the spread of the fire; further, even if the flexible pressure relief bag is damaged under extreme conditions, the plug can still continue to block the pressure relief channel and reduce the direct entry of external air into the cable; When toxic gases and smoke particles are generated during a fire inside the cable, the toxic gases and smoke particles can flow smoothly through the interaction channel and the connection channel to the smoke sensing channel; and the interaction channels between adjacent purification mechanisms are interconnected to form an overall smoke circulation network, thereby improving the absorption and purification efficiency of toxic gases and smoke particles; After the fire inside the cable is over and the staff disassemble and replace the damaged cable, the purification cover can be removed from the outer sheath layer of the damaged cable through the fixing component and transferred and fixed to the outside of the new cable for reuse; The heat insulation layer is made of materials with high temperature resistance and low thermal conductivity, which can effectively prevent or slow down the transfer of heat from the inside of the cable to the outside and prevent the fire from spreading to the outside of the cable. Description of the Drawings

[0026] Figure 1 is a schematic structural diagram of the fire-resistant steel wire armored flame-retardant multi-core cable in this application; Figure 2 is a schematic partial structural diagram of the fire-resistant steel wire armored flame-retardant multi-core cable; Figure 3 is a schematic partial sectional view of the fire-resistant steel wire armored flame-retardant multi-core cable; Figure 4 is a schematic partial sectional view of the pressure relief component; Figure 5 is a schematic partial sectional view of the fixing component.

[0027] Explanation of the reference numerals: 1. conductor; 11. insulating layer; 12. shielding layer; 13. inner protective cover; 2. flame retardant layer; 21. interactive holes; 3. thermal insulation layer; 4. armor layer; 5. outer sheath layer; 6. purification cover; 7. purification mechanism; 71. adsorption assembly; 711. adsorption chamber; 712. swivel; 713. opening and closing door; 714. buckle; 72. pressure relief assembly; 721. pressure relief channel; 722. pressure relief spring; 723. plug; 724. flexible pressure relief bag; 73. fixing assembly; 731. fixing cover; 732. pipe clamp; 733. sealing ring; 74. smoke sensing channel; 75. smoke sensor; 76. smoke alarm; 77. interactive channel; 78. connecting channel. DETAILED DESCRIPTION

[0028] The following is combined with Figures 1 - 5 This application is described in further detail.

[0029] After reading this specification, those skilled in the art may make non-creative modifications to this embodiment as needed, but such modifications are protected by patent law as long as they are within the scope of the claims of this application.

[0030] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0031] The present application embodiment discloses a fireproof steel wire armored flame retardant multi-core cable. Figure 1 and Figure 2, the fire-resistant steel wire armored flame-retardant multi-core cable includes a plurality of conductors 1, and an insulating layer 11, a shielding layer 12, and an inner protective sleeve 13 are sequentially sleeved outside each conductor 1. A flame-retardant layer 2, a heat-insulating layer 3, an armored layer 4, and an outer sheath layer 5 are sequentially and simultaneously sleeved outside the plurality of inner protective sleeves 13; wherein the flame-retardant layer 2 can be made of polyvinyl chloride material, and the heat-insulating layer 3 can be made of ultra-high temperature heat-insulating materials such as carbon fiber or zirconia fiber, which not only has extremely high heat resistance but also has a low thermal conductivity, and can effectively prevent or slow down the transfer of heat from the inside of the cable to the outside. A plurality of purification covers 6 are sleeved along the length direction outside the outer sheath layer 5, and the plurality of purification covers 6 are arranged at intervals, and the purification covers 6 communicate with the inside of the flame-retardant layer 2. A purification mechanism 7 is arranged between the purification cover 6 and the outer sheath layer 5, and the purification mechanism 7 includes an adsorption assembly 71 for absorbing toxic gases and smoke particles inside the flame-retardant layer 2, a pressure relief assembly 72 for relieving the pressure generated by high-temperature and high-pressure gases inside the flame-retardant layer 2, and a fixing assembly 73 for fixing the purification cover 6 to the outside of the outer sheath layer 5.

[0032] Under normal working conditions, the plurality of conductors 1 of the cable are electrically isolated and protected through the insulating layer 11, the shielding layer 12, and the inner protective sleeve 13 to ensure the stable transmission of current or signals. The flame-retardant layer 2 and the steel wire armored layer 4 improve the fire resistance and mechanical strength of the cable, and the outer sheath layer 5 provides physical protection. When the insulating layer 11 outside the conductor 1 inside the cable ages or the local insulating layer 11 is damaged due to the thermal expansion and contraction effect caused by climate change, and a short circuit occurs between the conductors 1, causing the combustion of each structural layer inside the flame-retardant layer 2, on the one hand, the flame-retardant layer 2 plays a role, making it difficult for the fire to spread to the outside of the flame-retardant layer 2. On the other hand, through the coordinated cooperation of the flame-retardant layer 2, the adsorption assembly 71, and the pressure relief assembly 72, toxic gases such as hydrogen halide and smoke particles generated by each structural layer inside the flame-retardant layer 2 diffuse to the side of the adsorption assembly 71 and are absorbed by the adsorption assembly 71, making it difficult for the toxic gases and smoke particles to diffuse to the outside of the cable, thereby reducing the pollution to the surrounding environment and reducing the threat to human health, creating favorable conditions for personnel evacuation and rescue work.

[0033] At the same time, the gas pressure inside the flame-retardant layer 2 will increase due to high temperature. At this time, the pressure relief assembly 72 starts to work to relieve the pressure inside the flame-retardant layer 2, preventing the cable from bursting locally due to excessive internal pressure and causing a large amount of air to rush in, thereby avoiding the intensification of the fire due to the supply of oxygen. Further, after the fire inside the cable ends, when the staff disassembles and replaces the damaged cable, the purification cover 6 can be removed from the damaged outer sheath layer 5 of the cable through the fixing assembly 73 and transferred and fixed to the outside of the new cable for repeated use.

[0034] Refer to Figure 3, the adsorption assembly 71 includes an adsorption chamber 711 disposed inside the purification cover 6. A plurality of adsorption chambers 711 are circumferentially arranged along the outer sheath layer 5. The adsorption chamber 711 is filled with activated carbon. A rotating ring 712 is rotatably connected to the outside of the purification cover 6. An opening / closing door 713 for opening or closing the adsorption chamber 711 is rotatably connected to the rotating ring 712. The opening / closing door 713 and the rotating ring 712 are fixed by a buckle 714.

[0035] When the cable is under normal working conditions, the opening / closing door 713 of the adsorption assembly 71 is in a closed state, and the activated carbon in the adsorption chamber 711 does not contact the external environment, maintaining its adsorption effect. When a fire occurs inside the cable and toxic gases and smoke particles are generated inside the flame retardant layer 2, the activated carbon in the adsorption chamber 711 absorbs the toxic gases and smoke particles emitted from the inside of the flame retardant layer 2. When the activated carbon is saturated after multiple adsorptions or the adsorption effect drops significantly, the staff can open the opening / closing door 713 and rotate the rotating ring 712, and then take out the activated carbon in each adsorption chamber 711 one by one and replace it with new activated carbon to ensure the continuous effectiveness of the adsorption assembly 71.

[0036] Refer to Figure 2 and Figure 3 , the purification mechanism 7 further includes a smoke sensing channel 74 disposed on one side of the purification cover 6 close to the outer sheath layer 5, a smoke sensor 75 disposed in the smoke sensing channel 74, a smoke alarm 76 disposed on the outside of the purification cover 6, and a controller connecting the smoke sensor 75 and the smoke alarm 76. The smoke sensor 75 is used to detect smoke particles and send out a detection signal. The controller is used to receive the detection signal to know that smoke particles are generated inside the cable and send out a control signal to the smoke alarm 76, and the smoke alarm 76 is activated.

[0037] When a fire occurs inside the cable and smoke particles are generated, the smoke particles enter the smoke sensor 75 through the smoke sensing channel 74, triggering the smoke sensor 75 to send out a detection signal. After receiving the detection signal of the smoke sensor 75, the controller judges the fire situation inside the cable and sends out a control signal to the smoke alarm 76. After receiving the control signal of the controller, the smoke alarm 76 immediately starts to give an alarm, reminding people to pay attention to the fire risk inside the cable. Through the real-time monitoring of the smoke sensor 75, early fire warning can be provided, buying precious time for personnel evacuation or cable repair work.

[0038] Refer to Figure 3 and Figure 4, the pressure relief component 72 includes a pressure relief channel 721 fixedly arranged on the outer side of the swivel ring 712. A pressure relief spring 722 is fixedly arranged inside the pressure relief channel 721. One end of the pressure relief spring 722 is fixedly provided with a plug 723, and the pressure relief spring 722 gives the plug 723 a force for blocking the pressure relief channel 721. At the end of the pressure relief channel 721 far from the swivel ring 712, a flexible pressure relief bag 724 is also arranged. The flexible pressure relief bag 724 is made of heat-resistant silica gel material. The heat-resistant silica gel material has excellent ductility and can withstand high pressure and high temperature.

[0039] In the initial state, under the action of the pressure relief spring 722, the plug 723 of the pressure relief component 72 blocks the pressure relief channel 721. The flexible pressure relief bag 724 is in a closed state, cooperating with the plug 723 to form a double protection isolation, jointly blocking the pressure relief channel 721 to prevent external air from entering the cable interior. The gas pressure inside the flame retardant layer 2 will increase due to the high temperature of combustion. When the gas pressure inside the cable reaches a certain threshold, the internal pressure begins to exert a force on the plug 723. When the internal pressure exceeds the elastic force of the pressure relief spring 722, the plug 723 is pushed, the pressure relief channel 721 is opened, and the high-pressure gas inside the flame retardant layer 2 is released, thereby reducing the internal pressure.

[0040] Then, the high-pressure gas enters the flexible pressure relief bag 724 through the pressure relief channel 721. The flexible pressure relief bag 724 absorbs and buffers the high-pressure gas released from the cable interior through its elastic structure. At the same time, it can also isolate external air to prevent a large amount of oxygen from pouring in, thereby controlling the spread of fire. And even if the flexible pressure relief bag 724 is damaged under extreme conditions, the plug 723 can still continue to block the pressure relief channel 721 to reduce the direct entry of external air into the cable interior. When the internal pressure of the cable drops to the safe range, the elastic force of the pressure relief spring 722 pushes the plug 723 back to its original position to block the pressure relief channel 721 and restore the sealed state inside the cable. The pressure relief component 72 controls the opening degree of the pressure relief channel 721 by adjusting the position of the plug 723, realizes the dynamic adjustment of the internal pressure of the cable, and prevents the cable from bursting locally due to excessive internal pressure by timely pressure relief, avoiding the influx of a large amount of air, thereby controlling the spread of fire.

[0041] Refer to Figure 3 and Figure 4 , a plurality of interaction channels 77 are evenly arranged along the circumferential direction on the outer side of the flame retardant layer 2. Each interaction channel 77 is arranged along the length direction of the flame retardant layer 2. A plurality of interaction holes 21 are arranged along the length direction and the circumferential direction on the inner side of the flame retardant layer 2. The interaction channels 77 are communicated with the interior of the flame retardant layer 2 through the interaction holes 21, and the interaction channels 77 between adjacent purification mechanisms 7 are communicated. Connection channels 78 are arranged on the heat insulation layer 3, the armor layer 4, and the outer sheath layer 5. The interaction channels 77 are communicated with the smoke sensing channels 74 through the connection channels 78.

[0042] When a fire breaks out inside the cable, generating toxic gases and smoke particles, the toxic gases and smoke particles can smoothly flow through the interaction holes 21, the interaction channels 77, and the connection channels 78 to the smoke sensing channel 74. Moreover, the interaction channels 77 between adjacent purification mechanisms 7 are interconnected to form an integral smoke circulation network, thereby improving the absorption and purification efficiency of toxic gases and smoke particles.

[0043] Refer to Figure 5 , the fixing component 73 includes two fixing sleeves 731 respectively rotatably connected to both sides of the purification cover 6 along the length direction of the outer sheath layer 5, and the fixing sleeves 731 are sleeved outside the outer sheath layer 5. A pipe clamp 732 is sleeved outside the fixing sleeve 731. A plurality of sealing rings 733 are fixedly arranged inside the fixing sleeve 731, and the plurality of sealing rings 733 are used to enhance the sealing performance between the inside of the fixing sleeve 731 and the outer sheath layer 5, preventing external environmental factors such as moisture and dust from invading the inside of the cable and affecting the normal operation and service life of the cable.

[0044] When fixing the purification cover 6 through the fixing component 73, sleeve the pipe clamp 732 outside the fixing sleeve 731 and tighten the pipe clamp 732 to form sufficient friction between the pipe clamp 732 and the fixing sleeve 731, and at the same time make the sealing ring 733 closely fit with the outer sheath layer 5. The purification cover 6 is rotatably connected to the fixing sleeve 731 for enabling the purification cover 6 to rotate on the fixing sleeve 731. When it is necessary to dump or replace the activated carbon in the adsorption chamber 711, the staff can directly rotate the purification cover 6 so that the adsorption chamber 711 of the activated carbon to be cleaned faces downward, thereby facilitating the dumping of the activated carbon in the adsorption chamber 711. When it is necessary to supplement the activated carbon in the adsorption chamber 711, the purification cover 6 can be directly rotated to make the adsorption chamber 711 face upward, so that the newly added activated carbon in the adsorption chamber 711 is not easily dropped from the opening and closing door 713.

[0045] The implementation principle of a fire-resistant steel wire armored flame-retardant multi-core cable in an embodiment of the present application is as follows: When the outer side of the internal conductor 1 of the cable is damaged locally due to the aging of the insulating layer 11 or the thermal expansion and contraction effect caused by climate change, and a short circuit occurs between the conductors 1, causing the combustion of each structural layer inside the flame-retardant layer 2, on the one hand, the flame-retardant layer 2 plays a role to prevent the fire from spreading easily to the outside of the flame-retardant layer 2. On the other hand, through the coordinated cooperation of the flame-retardant layer 2, the adsorption component 71 and the pressure relief component 72, the toxic gases such as hydrogen halide and smoke particles generated by each structural layer inside the flame-retardant layer 2 diffuse towards the adsorption component 71 and are absorbed by the adsorption component 71, making it difficult for the toxic gases and smoke particles to diffuse to the outside of the cable, thereby reducing the pollution to the surrounding environment and reducing the threat to human health, creating favorable conditions for personnel evacuation and rescue work. At the same time, the gas pressure inside the flame-retardant layer 2 will increase due to high temperature. At this time, the pressure relief component 72 starts to work to relieve the pressure inside the flame-retardant layer 2, preventing the cable from bursting locally due to excessive internal pressure and causing a large amount of air to rush in, thereby avoiding the intensification of the fire due to the supply of oxygen. Further, after the internal fire of the cable ends, when the staff disassembles and replaces the damaged cable, the purification cover 6 can be removed from the outer sheath layer 5 of the damaged cable through the fixing component 73 and transferred and fixed to the outside of the new cable for reuse.

[0046] The above are all the preferred embodiments of the present application, and the protection scope of the present application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. Fire-resistant steel wire armored flame-retardant multi-core cable, characterized in that, It includes a plurality of conductors (1), an insulating layer (11), a shielding layer (12), an inner protective sleeve (13) sleeved on the outside of each of the conductors (1) in sequence, and a flame-retardant layer (2), an armor layer (4), and an outer sheath layer (5) sleeved on the outside of a plurality of the inner protective sleeves (13) simultaneously in sequence; it further includes: Purifying covers (6) sleeved on the outside of the outer sheath layer (5), and a plurality of them are arranged at intervals along the length direction of the outer sheath layer (5), and the purifying covers (6) are internally communicated with the flame-retardant layer (2); A purifying mechanism (7) is arranged between the purifying cover (6) and the outer sheath layer (5), and includes an adsorption component (71), a pressure relief component (72), and a fixing component (73), wherein the adsorption component (71) is used for absorbing toxic gases and smoke particles inside the flame-retardant layer (2); the pressure relief component (72) is used for relieving the pressure generated by high-temperature and high-pressure gases inside the flame-retardant layer (2); the fixing component (73) is used for fixing the purifying cover (6) to the outside of the outer sheath layer (5).

2. The fireproof steel wire armored flame-retardant multi-core cable according to claim 1, wherein, The adsorption component (71) includes: Adsorption chambers (711) arranged inside the purifying cover (6), and a plurality of them are arranged circumferentially along the outer sheath layer (5), and activated carbon is filled in the adsorption chambers (711); A rotating ring (712) is rotatably connected to the outside of the purifying cover (6), and an opening and closing door (713) for opening or closing the adsorption chamber (711) is arranged on the rotating ring (712).

3. The fire-resistant steel wire armored flame-retardant multi-core cable according to claim 2, characterized in that, The pressure relief component (72) includes: A pressure relief channel (721) fixed to the outside of the rotating ring (712); A pressure relief spring (722) arranged inside the pressure relief channel (721); A plug (723) fixed to one end of the pressure relief spring (722), and the pressure relief spring (722) gives the plug (723) a force for blocking the pressure relief channel (721).

4. The fireproof steel wire armored flame-retardant multi-core cable according to claim 3, characterized in that, A flexible pressure relief bag (724) is arranged at one end of the pressure relief channel (721) far from the rotating ring (712).

5. The fireproof steel wire armored flame-retardant multi-core cable according to claim 2, characterized in that, The purifying mechanism (7) further includes: A smoke sensing channel (74) arranged on the side of the purifying cover (6) close to the outer sheath layer (5), and the smoke sensing channel (74) is communicated with the adsorption chamber (711); A smoke sensor (75) arranged inside the smoke sensing channel (74) for detecting smoke particles and sending out a detection signal; A smoke alarm (76) arranged on the outside of the purifying cover (6); A controller is connected to the smoke sensor (75) and the smoke alarm (76), and is used for receiving the detection signal to know that smoke particles are generated inside the cable, and simultaneously sending out a control signal to the smoke alarm (76), and the smoke alarm (76) is activated.

6. The fireproof steel wire armored flame-retardant multi-core cable according to claim 5, characterized in that, An interaction channel (77) is provided on the outer side of the flame retardant layer (2) along its length direction. A plurality of the interaction channels (77) are arranged circumferentially along the flame retardant layer (2). Each of the interaction channels (77) is communicated with the inside of the flame retardant layer (2), and the interaction channels (77) between adjacent purification mechanisms (7) are communicated. Connection channels (78) are provided on both the armored layer (4) and the outer sheath layer (5). The interaction channel (77) is communicated with the smoke sensing channel (74) through the connection channel (78).

7. The fireproof steel wire armored flame-retardant multi-core cable according to claim 6, characterized in that, An insulating layer (3) is further provided between the flame retardant layer (2) and the armored layer (4), and the connection channel (78) is also provided on the insulating layer (3).

8. The fireproof steel wire armored flame-retardant multi-core cable according to claim 2, wherein The fixing assembly (73) includes: Fixing sleeves (731), two in number. The two fixing sleeves (731) are respectively arranged on both sides of the purification cover (6) along the length direction of the outer sheath layer (5), and the fixing sleeves (731) are sleeved on the outer side of the outer sheath layer (5); Pipe clamps (732), sleeved on the outer side of the fixing sleeves (731).

9. The fireproof steel wire armored flame-retardant multi-core cable according to claim 8, characterized in that The purification cover (6) is rotatably connected with the fixing sleeve (731).

10. The fireproof steel wire armored flame-retardant multi-core cable according to claim 8, wherein, A plurality of sealing rings (733) are fixedly arranged on the inner side of the fixing sleeve (731).

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