Flame-retardant and explosion-proof cable and flame-retardant and explosion-proof method for cable

Abstract

The invention discloses a flame-retardant and explosion-proof cable and a flame-retardant and explosion-proof method for the cable, and belongs to the technical field of cables. The outer layer of the cable main body is detachably provided with a flame-retardant explosion-proof layer, the flame-retardant explosion-proof layer is divided into a butt joint type flame-retardant explosion-proof layer and a winding type flame-retardant explosion-proof layer, the butt joint type flame-retardant explosion-proof layer wraps the cable main body in an end-to-end butt joint mode, and the winding type flame-retardant explosion-proof layer wraps the cable main body in a spiral winding mode; the butt-joint type flame-retardant and explosion-proof layer and the winding type flame-retardant and explosion-proof layer respectively comprise a blocking layer, the blocking layers are tightly attached to the outer surface of the cable body, and the blocking layers are filled with cooling liquid. According to the flame-retardant and explosion-proof cable, the flame-retardant and explosion-proof layer can be mounted or dismounted according to actual requirements, and compared with a traditional integrated flame-retardant and explosion-proof cable and a flame-retardant and explosion-proof method for the cable, the flame-retardant and explosion-proof cable is more flexible in application and lower in investment cost.

Description

Technical Field

[0001] The present invention relates to the technical field of cables, and specifically to a flame-retardant and explosion-proof cable and a flame-retardant and explosion-proof method for cables. Background Art

[0002] With the development of the power industry, data communication industry, urban rail transit industry, etc., the requirements for cables in all walks of life are getting higher and higher. Especially in some dangerous places with flammable and explosive substances, such as gas stations, gas filling stations, gunpowder factories, ammunition depots, etc., the power cables used will all adopt flame-retardant and explosion-proof cables.

[0003] In the existing patent literature, there is a patent with a publication number of CN 213150421 U and a name of "A Flame-Retardant and Explosion-Proof Cable for Explosive Places". Although this patent and similar patents can achieve the flame-retardant and explosion-proof effects, the flame-retardant and explosion-proof structure is integrated with the cable. After the cable is erected at high altitude, the cable in the non-flammable and explosive dangerous places can completely adopt ordinary cables to reduce costs. However, after using the flame-retardant and explosion-proof cable produced by the above patent, its application flexibility will be reduced, and the input cost will also increase greatly. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a flame-retardant and explosion-proof cable and a flame-retardant and explosion-proof method for cables. This flame-retardant and explosion-proof cable can install or disassemble the flame-retardant and explosion-proof layer according to actual needs. Compared with the traditional integrated flame-retardant and explosion-proof cable and the flame-retardant and explosion-proof method for cables, it is more flexible in application and has a lower input cost.

[0005] The technical solution of the present invention is realized as follows:

[0006] A flame-retardant and explosion-proof cable includes a cable main body;

[0007] The outer layer of the cable main body is detachably installed with a flame-retardant and explosion-proof layer, and this flame-retardant and explosion-proof layer is divided into a butt-joint type flame-retardant and explosion-proof layer and a winding type flame-retardant and explosion-proof layer. Among them, the butt-joint type flame-retardant and explosion-proof layer wraps the cable main body in a head-to-tail butt-joint manner, and the winding type flame-retardant and explosion-proof layer wraps the cable main body in a spiral winding manner;

[0008] Both the butt-joint type flame-retardant and explosion-proof layer and the winding type flame-retardant and explosion-proof layer include a barrier layer, which closely adheres to the outer surface of the cable main body, and a coolant is filled inside the barrier layer.

[0009] Adopting the above solution, this flame-retardant and explosion-proof cable can install or disassemble the flame-retardant and explosion-proof layer according to actual needs. Compared with the traditional integrated flame-retardant and explosion-proof cable and the flame-retardant and explosion-proof method for cables, it is more flexible in application and has a lower input cost.

[0010] As a preferred embodiment of a flame-retardant and explosion-proof cable, the barrier layer is made of a high-melting-point soft rubber.

[0011] With the above solution, in order to improve the flame retardancy of the barrier layer, the barrier layer is made of a high-melting-point soft rubber, which can extend its burning resistance time.

[0012] As a preferred embodiment of a flame-retardant and explosion-proof cable, the coolant is a mixture of water and ethylene glycol, and the ratio of water to ethylene glycol is 3:2.

[0013] With the above solution, in order to slow down the heating speed of the barrier layer, the coolant is filled inside it, so that the barrier layer will not be easily burned through, thus providing more time for rescue work.

[0014] As a preferred embodiment of a flame-retardant and explosion-proof cable, the butt-joint type flame-retardant and explosion-proof layer is respectively provided with a dovetail-shaped protrusion and a dovetail-shaped groove at the head and tail ends of the barrier layer, and an interference fit can be achieved between the dovetail-shaped protrusion and the dovetail-shaped groove.

[0015] With the above solution, in order to achieve the butt-joint of the head and tail of the barrier layer, after the dovetail-shaped protrusion and the dovetail-shaped groove are in interference fit, the butt-joint type flame-retardant and explosion-proof layer can be firmly fixed on the cable main body.

[0016] As a preferred embodiment of a flame-retardant and explosion-proof cable, the wound type flame-retardant and explosion-proof layer is internally provided with a plurality of partitions linearly arrayed along its length direction inside the barrier layer.

[0017] With the above solution, since the wound type flame-retardant and explosion-proof layer is relatively long, in order to avoid uneven distribution of the coolant during the winding process, the partitions are used to evenly separate the coolant, thereby suppressing the flow of the coolant.

[0018] As a preferred embodiment of a flame-retardant and explosion-proof cable, both the butt-joint type flame-retardant and explosion-proof layer and the wound type flame-retardant and explosion-proof layer further include a fire extinguishing layer located outside the barrier layer. The fire extinguishing layer is divided into a plurality of interconnected and spaced chambers inside. Each chamber is filled with high-pressure gas and flame-retardant powder; the fire extinguishing layer is made of low-melting-point thin polyvinyl chloride; the high-pressure gas is an inert gas, and the air pressure of the inert gas is 2-3 bar; the flame-retardant powder is aluminum hydroxide powder or magnesium hydroxide powder.

[0019] With the above solution, since the barrier layer can only achieve passive flame retardancy, in order to achieve active fire extinguishing and flame retardancy, an easily burned-through fire extinguishing layer is added outside the barrier layer. If an explosion occurs in a flammable and explosive place and the flame spreads to the cable main body, the flame will quickly burn through the fire extinguishing layer. Once the fire extinguishing layer is damaged, the high-pressure gas inside it will cause the flame-retardant powder to quickly spread. It will not only inhibit the spread of the fire in the air, but also the impurities generated after the flame-retardant powder reacts with fire will fall to the ground, and it can also play a certain warning role for personnel.

[0020] A flame retardant and explosion-proof method for cables, the method is implemented by using the flame retardant and explosion-proof cable, and the cable body is implemented by using a butt-jointed flame retardant and explosion-proof layer or a wound flame retardant and explosion-proof layer;

[0021] 1. The steps to implement the cable body with a butt-jointed flame-retardant and explosion-proof layer are as follows:

[0022] S1. After the cable body is erected at high altitude, if the cable body passes through flammable and explosive places, such as gas stations, etc., it is only necessary to apply a butt-jointed flame-retardant and explosion-proof layer on the cable body above the gas station;

[0023] S2. The butt-jointed flame retardant and explosion-proof layer is merged to the outside of the cable body and the outer surface of the cable body is completely wrapped. After wrapping, the butt-jointed flame retardant and explosion-proof layer can be completely fixed by clamping the dovetail protrusion and the dovetail groove;

[0024] S3. If the height of the cable body is relatively high, in order to prevent the butt-jointed flame-retardant and explosion-proof layer from falling off due to the shaking of the cable body, strong glue can be used to strengthen the fixation at the joint between the dovetail protrusion and the dovetail groove;

[0025] S4. If an explosion occurs in a flammable and explosive place, when the flame spreads to the main body of the cable, the flame will quickly burn through the fire extinguishing layer. Once the fire extinguishing layer is damaged, the high-pressure gas inside it will cause the flame retardant powder to spread rapidly, which will not only inhibit the spread of high-altitude fires, but also the impurities produced by the flame retardant powder after the fire reaction will fall to the ground, which can also serve as a certain warning to personnel;

[0026] S5. Since the temperature of the coolant in the barrier layer is relatively low, the barrier layer will not be easily burned by the flame under the support of the coolant, thereby providing flame retardant and explosion-proof protection for the cable body, thereby providing longer time for rescue work.

[0027] 2. The steps for implementing the cable body with a wrapped flame retardant and explosion-proof layer are as follows:

[0028] S1. After the cable body is erected at high altitude, if the cable body passes through flammable and explosive places, such as gas stations, etc., it is only necessary to apply a winding flame retardant and explosion-proof layer on the cable body above the gas station;

[0029] S2. Spirally wrap the wound flame retardant and explosion-proof layer to the outside of the cable body and completely wrap the outer surface of the cable body, and use strong glue to completely fix the wound flame retardant and explosion-proof layer;

[0030] S3. If an explosion occurs in a flammable and explosive place, when the flame spreads to the main body of the cable, the flame will quickly burn through the fire extinguishing layer. Once the fire extinguishing layer is damaged, the high-pressure gas inside it will cause the flame retardant powder to spread rapidly, which will not only inhibit the spread of high-altitude fires, but also the impurities produced by the flame retardant powder after the fire reaction will fall to the ground, which can also serve as a certain warning to personnel;

[0031] S4. Since the temperature of the coolant in the barrier layer is relatively low, the barrier layer will not be easily burned by the flame under the support of the coolant, thereby providing flame retardant and explosion-proof protection for the cable body, thereby providing longer time for rescue work.

[0032] After adopting the above technical solution, the beneficial effects of the present invention are:

[0033] 1. The flame-retardant and explosion-proof cable can install or remove the flame-retardant and explosion-proof layer according to actual needs. Compared with the traditional integrated flame-retardant and explosion-proof cable and the flame-retardant and explosion-proof method for the cable, its application is more flexible, making its investment cost lower;

[0034] 2. In order to improve the flame retardancy of the barrier layer, a high melting point soft rubber is used to make the barrier layer, which can extend its burning time;

[0035] 3. In order to slow down the heating speed of the barrier layer, coolant is filled inside it so that the barrier layer will not be easily burned, thereby providing more time for rescue work;

[0036] 4. In order to achieve the end-to-end docking of the barrier layer, the dovetail protrusion and the dovetail groove are used for interference fit, so that the docking flame-retardant and explosion-proof layer can be firmly fixed on the cable body;

[0037] 5. Since the wound flame retardant and explosion-proof layer is long, in order to avoid uneven distribution of the coolant during the winding process, the coolant is evenly separated by a partition, thereby inhibiting the flow of the coolant;

[0038] 6. Since the barrier layer can only achieve passive flame retardancy, in order to achieve active fire extinguishing and flame retardancy, an easy-to-burn fire extinguishing layer is added to the outside of the barrier layer. If an explosion occurs in a flammable and explosive place, when the flame spreads to the cable body, the flame will quickly burn through the fire extinguishing layer. Once the fire extinguishing layer is damaged, the high-pressure gas inside it will cause the flame retardant powder to spread rapidly, which will not only suppress the spread of high-altitude fires, but also the impurities produced by the flame retardant powder after the fire reaction will fall to the ground, which can also serve as a certain warning to personnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0040] Figure 1 It is a three-dimensional structure diagram when the present invention is applied in the first embodiment;

[0041] Figure 2 For Figure 1 The three-dimensional structure after the docking type flame-retardant and explosion-proof layer in Figure 1 ;

[0042] Figure 3 For Figure 1 The three-dimensional structure after the docking type flame-retardant and explosion-proof layer in Figure 2 ;

[0043] Figure 4 For showing Figure 2 The three-dimensional structure diagram of the internal structure;

[0044] Figure 5 It is a three-dimensional structure diagram when the present invention is applied in the second embodiment;

[0045] Figure 6 For Figure 1 The three-dimensional structure diagram after the winding type flame-retardant and explosion-proof layer in

[0046] Figure 7 For showing Figure 6 The three-dimensional structure diagram of the internal structure.

[0047] Markings in the figure: 1 - cable main body; 2 - docking type flame-retardant and explosion-proof layer; 3 - winding type flame-retardant and explosion-proof layer; 4 - barrier layer; 5 - coolant; 6 - dovetail-shaped protrusion; 7 - dovetail-shaped groove; 8 - partition flap; 9 - fire extinguishing layer; 10 - flame-retardant powder. Specific embodiments

[0048] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0049] Embodiment 1, as Figures 1 to 4As shown in the figure, a flame-retardant and explosion-proof cable includes a cable main body 1; a flame-retardant and explosion-proof layer is detachably installed on the outer layer of the cable main body 1, and this flame-retardant and explosion-proof layer is a butt-joint type flame-retardant and explosion-proof layer 2, and the butt-joint type flame-retardant and explosion-proof layer 2 wraps the cable main body 1 in a head-to-tail butt-joint manner; the butt-joint type flame-retardant and explosion-proof layer 2 includes a barrier layer 4, and this barrier layer 4 closely adheres to the outer surface of the cable main body 1, and a coolant 5 is filled inside this barrier layer 4. This flame-retardant and explosion-proof cable can install or remove the flame-retardant and explosion-proof layer according to actual needs. Compared with traditional integral flame-retardant and explosion-proof cables and flame-retardant and explosion-proof methods for cables, it is more flexible in application, making its input cost lower.

[0050] As Figures 2 to 4 shown, the barrier layer 4 is made of high-melting-point soft rubber. In order to improve the flame retardancy of the barrier layer 4, using high-melting-point soft rubber to make the barrier layer 4 can extend its burning resistance time.

[0051] As Figures 2 to 4 shown, the coolant 5 is a mixture of water and ethylene glycol, and the ratio of water to ethylene glycol is 3:2. In order to delay the heating speed of the barrier layer 4, filling the coolant 5 inside it makes the barrier layer 4 not be easily burned through, thus providing more time for rescue work.

[0052] As Figures 2 to 4 shown, at the head and tail ends of the barrier layer 4 in the butt-joint type flame-retardant and explosion-proof layer 2, a dovetail-shaped protrusion 6 and a dovetail-shaped groove 7 are respectively provided, and an interference fit can be achieved between the dovetail-shaped protrusion 6 and the dovetail-shaped groove 7. In order to achieve the head-to-tail butt-joint of the barrier layer 4, after the interference fit of the dovetail-shaped protrusion 6 and the dovetail-shaped groove 7, the butt-joint type flame-retardant and explosion-proof layer 2 can be firmly fixed on the cable main body 1.

[0053] As Figures 2 to 4 shown, both the butt-joint type flame-retardant and explosion-proof layer 2 and the winding type flame-retardant and explosion-proof layer 3 also include a fire extinguishing layer 9 located outside the barrier layer 4. This fire extinguishing layer 9 is divided into multiple interconnected and spaced chambers, and each chamber is filled with high-pressure gas and a flame-retardant powder 10; the fire extinguishing layer 9 is made of low-melting-point thin polyvinyl chloride; the high-pressure gas is an inert gas, and the air pressure of this inert gas is 2 - 3 bar; the flame-retardant powder 10 is aluminum hydroxide powder or magnesium hydroxide powder. Since the barrier layer 4 can only achieve passive flame retardancy, in order to achieve active fire extinguishing and flame retardancy, an easily burned-through fire extinguishing layer 9 is added outside the barrier layer 4. If an explosion occurs in a flammable and explosive place and the flame spreads to the cable main body 1, the flame will quickly burn through the fire extinguishing layer 9. Once the fire extinguishing layer 9 is damaged, the high-pressure gas inside it will cause the flame-retardant powder 10 to spread quickly, which will not only inhibit the spread of the high-altitude fire, but also the impurities generated after the reaction of the flame-retardant powder 10 with fire will fall to the ground, and it can also play a certain warning role for personnel.

[0054] As Figures 1 to 4As shown in the figure, a flame-retardant and explosion-proof method for cables is implemented using the flame-retardant and explosion-proof cable in Embodiment 1. The steps of implementing the cable main body 1 with the butt-joint type flame-retardant and explosion-proof layer 2 are as follows:

[0055] S1. After the cable main body 1 is erected at a high altitude, if the area below the cable main body 1 passes through flammable and explosive places such as gas stations, etc., it is only necessary to apply the butt-joint type flame-retardant and explosion-proof layer 2 to the cable main body 1 above the gas station.

[0056] S2. Merge the butt-joint type flame-retardant and explosion-proof layer 2 to the outside of the cable main body 1 and completely wrap the outer surface of the cable main body 1. After wrapping, the butt-joint type flame-retardant and explosion-proof layer 2 can be completely fixed by the snap connection of the dovetail-shaped protrusion 6 and the dovetail-shaped groove 7.

[0057] S3. If the height where the cable main body 1 is located is relatively high, in order to prevent the butt-joint type flame-retardant and explosion-proof layer 2 from falling off due to the shaking of the cable main body 1, strong glue can be used to strengthen the fixation at the snap connection of the dovetail-shaped protrusion 6 and the dovetail-shaped groove 7.

[0058] S4. If an explosion occurs in the flammable and explosive place and the flame spreads to the cable main body 1, the flame will quickly burn through the fire extinguishing layer 9. Once the fire extinguishing layer 9 is damaged, the high-pressure gas inside it will cause the flame-retardant powder 10 to spread rapidly. It will not only inhibit the spread of the fire at high altitude, but also the impurities generated after the flame-retardant powder 10 reacts with fire will fall to the ground, and it can also play a certain warning role for personnel.

[0059] S5. Since the coolant 5 in the barrier layer 4 has a relatively low temperature, the barrier layer 4 will not be easily burned through by the flame under the action of the coolant 5, thus playing a role in flame-retardant and explosion-proof protection for the cable main body 1, and further providing more time for rescue work.

[0060] Embodiment 2, as Figures 5 to 7 shown, a flame-retardant and explosion-proof cable includes a cable main body 1; a flame-retardant and explosion-proof layer is detachably installed on the outer layer of the cable main body 1, and this flame-retardant and explosion-proof layer is a winding type flame-retardant and explosion-proof layer 3, and the winding type flame-retardant and explosion-proof layer 3 wraps the cable main body 1 in a spiral winding manner; the winding type flame-retardant and explosion-proof layer 3 all includes a barrier layer 4, and this barrier layer 4 closely adheres to the outer surface of the cable main body 1, and a coolant 5 is filled inside this barrier layer 4. This flame-retardant and explosion-proof cable can install or disassemble the flame-retardant and explosion-proof layer according to actual needs. Compared with the traditional integral flame-retardant and explosion-proof cable and the flame-retardant and explosion-proof method for cables, it is more flexible in application, making its input cost lower.

[0061] As Figures 6 to 7 shown, the barrier layer 4 is made of high-melting-point soft rubber. In order to improve the flame retardancy of the barrier layer 4, using high-melting-point soft rubber to make the barrier layer 4 can extend its fire resistance time.

[0062] As Figures 6 to 7As shown in the figure, the coolant 5 is a mixture of water and ethylene glycol, and the ratio of water to ethylene glycol is 3:2. In order to slow down the heating rate of the barrier layer 4, the coolant 5 is filled inside it, so that the barrier layer 4 will not be easily burned through, thus providing more time for rescue work.

[0063] As Figures 6 to 7 shown, inside the barrier layer 4 of the winding type flame-retardant and explosion-proof layer 3, there are multiple lobes 8 linearly arrayed along its length direction. Since the winding type flame-retardant and explosion-proof layer 3 is relatively long, in order to avoid uneven distribution of the coolant 5 during its winding process, the lobes 8 are used to evenly separate the coolant 5, thereby suppressing the flow of the coolant 5.

[0064] As Figures 6 to 7 shown, both the butt-joint type flame-retardant and explosion-proof layer 2 and the winding type flame-retardant and explosion-proof layer 3 further include a fire extinguishing layer 9 located outside the barrier layer 4. The fire extinguishing layer 9 is divided into multiple interconnected and spaced chambers, and each chamber is filled with high-pressure gas and flame-retardant powder 10; the fire extinguishing layer 9 is made of low-melting-point thin polyvinyl chloride; the high-pressure gas is an inert gas, and the air pressure of this inert gas is 2 - 3 bar; the flame-retardant powder 10 is aluminum hydroxide powder or magnesium hydroxide powder. Since the barrier layer 4 can only achieve passive flame retardancy, in order to achieve active fire extinguishing and flame retardancy, an easily burned-through fire extinguishing layer 9 is added outside the barrier layer 4. If an explosion occurs in a flammable and explosive place and the flame spreads to the cable main body 1, the flame will quickly burn through the fire extinguishing layer 9. Once the fire extinguishing layer 9 is damaged, the high-pressure gas inside it will cause the flame-retardant powder 10 to quickly spread, which will not only inhibit the spread of the fire in the air, but also the impurities generated after the reaction of the flame-retardant powder 10 with fire will fall to the ground, and it can also play a certain warning role for personnel.

[0065] As Figures 6 to 7 shown, a flame-retardant and explosion-proof method for cables, this method is implemented using the flame-retardant and explosion-proof cable in Embodiment 2, and the steps of implementing the winding type flame-retardant and explosion-proof layer 3 on the cable main body 1 are as follows:

[0066] S1. After the cable main body 1 is erected in the air, if the area below the cable main body 1 passes through a flammable and explosive place, such as a gas station, etc., only the winding type flame-retardant and explosion-proof layer 3 needs to be applied to the cable main body 1 above the gas station.

[0067] S2. Spirally wind the winding type flame-retardant and explosion-proof layer 3 around the outside of the cable main body 1 and completely wrap the outer surface of the cable main body 1, and use strong glue to completely fix the winding type flame-retardant and explosion-proof layer 3.

[0068] S3. If an explosion occurs in an inflammable and explosive place, when the flame spreads to the cable body 1, the flame will quickly burn through the fire extinguishing layer 9. Once the fire extinguishing layer 9 is damaged, the high-pressure gas inside it will cause the flame retardant powder 10 to spread rapidly, which will not only inhibit the spread of high-altitude fire, but also the impurities produced by the flame retardant powder 10 after the fire reaction will fall to the ground, which can also serve as a certain warning to personnel;

[0069] S4. Since the temperature of the coolant 5 in the barrier layer 4 is relatively low, the barrier layer 4 will not be easily burned by the flame under the support of the coolant 5, thereby providing flame retardant and explosion-proof protection for the cable body 1, thereby providing longer time for rescue work.

[0070] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. 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 flame retardant and explosion-proof cable, comprising a cable body; It is characterized in that: The outer layer of the cable body is detachably installed with a flame retardant and explosion-proof layer, which is divided into a butt-jointed flame retardant and explosion-proof layer and a wound flame retardant and explosion-proof layer, wherein the butt-jointed flame retardant and explosion-proof layer wraps the cable body in a head-to-tail butt-jointed manner, and the wound flame retardant and explosion-proof layer wraps the cable body in a spiral winding manner; The butt-jointed flame-retardant and explosion-proof layer and the wound flame-retardant and explosion-proof layer both comprise a barrier layer, which is tightly attached to the outer surface of the cable body, and the interior of the barrier layer is filled with coolant.

2. The flame-retardant and explosion-proof cable according to claim 1, wherein: The barrier layer is made of high melting point soft rubber.

3. The flame-retardant and explosion-proof cable according to claim 2, wherein: The coolant is a mixture of water and ethylene glycol, wherein the ratio of water to ethylene glycol is 3:

2.

4. The flame-retardant and explosion-proof cable according to claim 3, wherein: The head and tail ends of the barrier layer in the butt-jointed flame-retardant and explosion-proof layer are respectively provided with a dovetail protrusion and a dovetail groove, wherein the dovetail protrusion and the dovetail groove can be interference-fitted.

5. The flame-retardant and explosion-proof cable according to claim 1, wherein: A plurality of partition petals distributed in a linear array along the length direction are arranged inside the barrier layer in the wound flame retardant and explosion-proof layer.

6. The flame-retardant and explosion-proof cable according to claim 4 or 5, characterized in that: The butt-jointed flame-retardant and explosion-proof layer and the wound flame-retardant and explosion-proof layer both further include a fire-extinguishing layer located outside the barrier layer. The fire-extinguishing layer is divided into a plurality of interconnected and spaced-apart chambers, each of which is filled with high-pressure gas and flame-retardant powder.

7. The flame-retardant and explosion-proof cable according to claim 6, wherein: The fire extinguishing layer is made of thin polyvinyl chloride with low melting point.

8. The flame-retardant and explosion-proof cable according to claim 7, wherein: The high-pressure gas is an inert gas, and the pressure of the inert gas is 2-3 bar.

9. The flame-retardant and explosion-proof cable according to claim 8, wherein: The flame retardant powder is aluminum hydroxide powder or magnesium hydroxide powder.

10. A flame-retardant and explosion-proof method for cables, characterized in that: The method is implemented by using the flame-retardant and explosion-proof cable according to claim 9, which uses a butt-jointed flame-retardant and explosion-proof layer or a wound flame-retardant and explosion-proof layer to implement the cable body; 1. The steps to implement the cable body with a butt-jointed flame-retardant and explosion-proof layer are as follows: S1. After the cable body is erected at high altitude, if the cable body passes through flammable and explosive places, such as gas stations, etc., it is only necessary to apply a butt-jointed flame-retardant and explosion-proof layer on the cable body above the gas station; S2. The butt-jointed flame retardant and explosion-proof layer is merged to the outside of the cable body and the outer surface of the cable body is completely wrapped. After wrapping, the butt-jointed flame retardant and explosion-proof layer can be completely fixed by clamping the dovetail protrusion and the dovetail groove; S3. If the height of the cable body is relatively high, in order to prevent the butt-jointed flame-retardant and explosion-proof layer from falling off due to the shaking of the cable body, strong glue can be used to strengthen the fixation at the joint between the dovetail protrusion and the dovetail groove; S4. If an explosion occurs in a flammable and explosive place, when the flame spreads to the main body of the cable, the flame will quickly burn through the fire extinguishing layer. Once the fire extinguishing layer is damaged, the high-pressure gas inside it will cause the flame retardant powder to spread rapidly, which will not only inhibit the spread of high-altitude fires, but also the impurities produced by the flame retardant powder after the fire reaction will fall to the ground, which can also serve as a certain warning to personnel; S5. Since the temperature of the coolant in the barrier layer is relatively low, the barrier layer will not be easily burned by the flame under the support of the coolant, thus playing a role in flame retardant and explosion-proof protection for the cable body, thereby providing longer time for rescue work; 2. The steps for implementing the cable body with a wrapped flame retardant and explosion-proof layer are as follows: S1. After the cable main body is erected at high altitude, if the area below the cable main body passes through flammable and explosive places such as gas stations, etc., it is only necessary to apply a wrapped flame-retardant and explosion-proof layer on the cable main body above the gas station; S2. Spirally wind the wrapped flame-retardant and explosion-proof layer around the outside of the cable main body and completely wrap the outer surface of the cable main body, and use strong glue to completely fix the wrapped flame-retardant and explosion-proof layer; S3. If an explosion occurs in the flammable and explosive place and the flame spreads to the cable main body, the flame will quickly burn through the fire extinguishing layer. Once the fire extinguishing layer is damaged, the high-pressure gas inside it will cause the flame-retardant powder to spread rapidly. It will not only inhibit the spread of the fire at high altitude, but the impurity substances generated after the flame-retardant powder reacts with fire will fall to the ground, and it can also play a certain warning role for personnel; S4. Since the coolant temperature in the barrier layer is relatively low, the barrier layer will not be easily burned through by the flame under the support of the coolant, thus playing a role in flame-retardant and explosion-proof protection for the cable main body, and further providing more time for rescue work.

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