Cable fireproof blanket and installation, pressure relief, heat dissipation and secondary protection method thereof

Abstract

The invention discloses a cable fireproof blanket and an installation, pressure relief, heat dissipation and secondary protection method thereof, and the cable fireproof blanket is characterized in that the cable fireproof blanket comprises a blanket body and a pressure relief buffer fixing part; the blanket body sequentially comprises a fireproof outer layer, a soft protective layer, an electromagnetic shielding layer, a hard explosion-proof layer and a fireproof inner layer from outside to inside; the fireproof inner layer is of a protruding structure. The pressure relief buffer fixing piece comprises at least two strip-shaped long belts and an iron ring; a strip-shaped long belt is arranged on the upper surface of the blanket body, an iron ring is arranged at one end of the strip-shaped long belt, and the strip-shaped long belt stretches across the upper surface of the blanket body and extends out of the other side of the blanket body. The end of the strip-shaped long belt is provided with a quick-release fixing piece, and the strip-shaped long belt is arranged in a telescopic mode. Protection is provided from different aspects through the blanket body of a multi-layer structure, a strip-shaped long belt, an iron ring and a quick-release fixing piece in the pressure relief buffer fixing piece are matched, the fireproof blanket is fixed conveniently, the telescopic section can buffer pressure and protect the completeness of the fireproof blanket when electric arc explosion happens to the cable connector, and it is ensured that the fireproof blanket can still play a role during secondary explosion.

Description

Technical Field

[0001] This application belongs to the technical field of cable protection, and particularly relates to a cable fireproof blanket and its installation, pressure relief, heat dissipation, and secondary protection methods. Background Art

[0002] In modern society, electric energy, as a key energy source, supports social production and residents' lives. With the rapid growth of power loads, the scale of the power transmission and distribution network has been continuously expanding, the system complexity has been significantly improved, and the occurrence frequency of electrical fire accidents has also increased accordingly. Data from the Fire and Rescue Bureau of the Emergency Management Department shows that the annual growth rate of electrical fire accidents has been continuously rising in the past five years, and the fire caused by cable joint failures accounts for more than 40%.

[0003] Cable joints are extremely prone to arc ignition and explosion phenomena under overload conditions. The instantaneous temperature can reach thousands of degrees Celsius, and destructive shock waves are accompanied. This will not only damage the surrounding cables but also seriously threaten the safety of operation and maintenance personnel. In addition, problems such as poor contact, metal oxidation, or moisture corrosion during the installation process will cause heat accumulation. If the heat cannot be dissipated in time, the continuous temperature rise will cause the insulation layer to melt, resulting in short circuits or fires.

[0004] The special structure of the cable corridor poses great challenges to fire fighting: the confined and narrow space restricts the coverage of the fire extinguishing medium to the fire source; the high-temperature and toxic smoke hinders rescue operations; the secondary arc ignition and explosion directly threaten the safety of rescue personnel. According to the "Operation and Maintenance Regulations for Power Cables and Channels", the cable channel needs to be inspected every three months. However, when operation and maintenance personnel detect high-risk parts such as cable joints, they face the double dangers of arc burns and explosions.

[0005] Currently, the commonly used cable fireproof blankets mainly cover high-fault locations such as cable joints. However, their designs mostly focus on high-temperature resistance, with obvious deficiencies in heat dissipation and pressure relief, limited protection effect against secondary ignition and explosion, and it is difficult to meet the increasingly demanding power safety requirements. Summary of the Invention

[0006] The purpose of the embodiments of this application is to provide a cable fireproof blanket and its installation, pressure relief, heat dissipation, and secondary protection methods, so as to solve the problems in the above background art that the middle joints of power cables affect the normal operation of cables and the safe operation of the power system due to poor heat dissipation, arc ignition and explosion pressure shock, and insufficient secondary ignition and explosion protection.

[0007] To achieve the above purpose, this application adopts the following technical solutions: In the first aspect, a cable fireproof blanket is provided, including a blanket body and a pressure relief buffer fixing member; The blanket body sequentially includes a fireproof outer layer, a soft protection layer, an electromagnetic shielding layer, a hard explosion-proof layer, and a fireproof inner layer from the outside to the inside; The fireproof inner layer is arranged in a convex structure; The pressure relief buffer fixing member includes at least two strip-shaped long belts and iron rings; A strip-shaped long belt is provided on the upper surface of the blanket body. One end of the strip-shaped long belt is provided with an iron ring. The strip-shaped long belt spans across the upper surface of the blanket body and extends out on the other side; A quick-release fixing member is provided at the end of the strip-shaped long belt, and the strip-shaped long belt is telescopically arranged.

[0008] In a possible implementation manner, the convex structure inside the fireproof inner layer is filled with fireproof caulking material for enhancing heat dissipation and suppressing the spread of fire.

[0009] In a possible implementation manner, the fireproof inner layer and the fireproof outer layer are made of silicone rubber cloth.

[0010] In a possible implementation manner, the electromagnetic shielding layer is made of polytetrafluoroethylene arc-resistant cloth.

[0011] In a possible implementation manner, the material of the rigid explosion-proof layer is set as steel plate.

[0012] In a possible implementation manner, the soft protection layer is a fabric made of a blend of polyimide and aramid.

[0013] In a second aspect, there is provided a method for installing a cable fireproof blanket, including the following steps: Surround the cable joint with the blanket body for more than one week to ensure complete coverage of the cable joint; Pass the strip-shaped long belt through the iron ring and complete the fixation by using the quick-release fixing member; Adjust the tightness through the telescopic section to ensure that the blanket body fits tightly against the cable joint.

[0014] In a third aspect, there is provided a method for relieving pressure of a cable fireproof blanket, including the following steps: When an arc explosion occurs at the cable joint, the expansion pressure causes the blanket body to expand; The telescopic section buffers the pressure and transmits the pressure to the fireproof inner layer. The convex structure of the fireproof inner layer releases the impact force through deformation and air circulation; After pressure relief, the elastic restoring force of the strip-shaped long belt causes the blanket body to tightly wrap the cable joint again to cope with secondary explosion.

[0015] In a third aspect, there is provided a method for dissipating heat of a cable fireproof blanket, including the following steps: The convex structure of the fireproof inner layer increases the air gap with the cable joint; The fireproof caulking material filled inside assists in conducting heat from the cable joint to the outside of the blanket body and dissipating it through air convection to prevent local temperature accumulation.

[0016] Fourthly, a secondary protection method for a cable fireproof blanket is provided, including the following steps: When the first explosion occurs, the rigid explosion-proof layer resists the explosion impact force, the electromagnetic shielding layer blocks the electric arc, and at the same time, the fireproof outer layer and the soft protection layer work together to prevent the blanket body from tearing; After pressure relief, the blanket body automatically resets to maintain the wrapped state of the cable joint, ensuring that it still has a protective ability during the second explosion.

[0017] Compared with the prior art, the present application has the following beneficial effects: A cable fireproof blanket provided by the present application provides protection from different aspects through a multi-layered blanket body. The fireproof outer layer and the inner layer of silicone rubber cloth can effectively resist external fires and fires caused by internal electric arcs; the soft protection layer can buffer external impact forces and protect the internal structure; the electromagnetic shielding layer prevents the electric arc from causing harm to surrounding equipment and personnel; the rigid explosion-proof layer enhances the physical strength of the fireproof blanket and resists the explosion impact force. The cooperation between the strip-shaped long belt, the iron ring and the quick-release fixing member in the pressure relief buffer fixing member not only facilitates the fixing of the fireproof blanket, but also the telescopic section can buffer the pressure when an electric arc explosion occurs at the cable joint, protecting the integrity of the fireproof blanket and ensuring that it can still play a role during the second explosion.

[0018] In a possible implementation manner, the fireproof inner layer is filled with fireproof putty and adopts a convex structure, which significantly enhances the heat dissipation performance, effectively reduces the temperature of the cable joint, and improves the stability and safety of the cable operation. At the same time, the function of suppressing the spread of fire can prevent the large-scale spread of fire in the cable corridor, reduce the impact of fire on the entire power system, and ensure the normal operation of the power system.

[0019] In a possible implementation manner, the installation method is simple and convenient, and can ensure that the fireproof blanket is accurately and firmly installed on the cable joint. The requirement of surrounding the cable joint more than once ensures the full coverage of the cable joint by the fireproof blanket. The combined use of the telescopic strip-shaped long belt and the quick-release fixing member facilitates the adjustment of the tightness, enables the fireproof blanket to closely fit the cable joint, and improves the protection effect and stability of the fireproof blanket.

[0020] In a possible implementation manner, the pressure relief method can effectively buffer the expansion pressure generated by the electric arc explosion of the cable joint and protect the structural integrity of the fireproof blanket. By releasing the impact force through the special structure of the fireproof inner layer, the damage to the fireproof blanket caused by the pressure is avoided, ensuring that the fireproof blanket can still maintain the wrapped state of the cable joint after pressure relief, providing protection for the second explosion, and improving the reliability and safety of the fireproof blanket.

[0021] In a possible implementation, this heat dissipation method utilizes the special structure of the fireproof inner layer and the heat conduction performance of the fireproof caulking material, increases the air gap with the cable joint, promotes air convection, effectively dissipates the heat generated by the cable joint, prevents local overheating, ensures the normal operation of the cable, and extends the service life of the cable.

[0022] In a possible implementation, this secondary protection method, through the synergistic effect of each layer structure, effectively resists the damage of the first explosion, ensures that the fireproof blanket can automatically reset after pressure relief, continues to provide protection for the cable joint, improves the protection ability of the fireproof blanket under multiple explosion conditions, and guarantees the safe operation of the power system. Brief Description of the Drawings

[0023] Figure 1 It is a schematic diagram of the overall structure of a cable fireproof blanket provided by this application; Figure 2 It is a schematic diagram of the cross-section of the blanket body provided by this application.

[0024] Reference numerals in the drawings: 1, blanket body; 2, iron ring; 3, strip-shaped long belt; 4, telescopic section; 5, fireproof outer layer; 6, soft protection layer; 7, electromagnetic shielding layer; 8, hard explosion-proof layer; 9, fireproof inner layer; 10, fireproof caulking material; 11, quick-release fixing part. Detailed Description of the Invention

[0025] The following further elaborates in detail the specific implementation manners of this application with reference to the drawings.

[0026] As Figure 1 and Figure 2 shown, a cable fireproof blanket of this application may include a blanket body 1 and a pressure relief buffer fixing part.

[0027] The blanket body 1 sequentially includes a fireproof outer layer 5, a soft protection layer 6, an electromagnetic shielding layer 7, a hard explosion-proof layer 8, and a fireproof inner layer 9 from outside to inside.

[0028] Optionally, when actually manufacturing the cable fireproof blanket, the size of the blanket body 1 is designed according to the size of common cable joints. For example, the blanket body 1 may be set to be 50 cm long and 30 cm wide.

[0029] The fireproof inner layer 9 is set as a convex structure.

[0030] The silicone rubber cloth of both the fireproof outer layer 5 and the fireproof inner layer 9 has a thickness of 2 mm, which can not only ensure the fireproof performance but also have a certain flexibility.

[0031] The soft protection layer 6 is made of a fabric woven from polyimide and aramid in a ratio of 7:3, with a thickness of 1.5 mm.

[0032] The electromagnetic shielding layer 7 can be made of materials with arc shielding functions such as arc shielding layers, and the rigid explosion-proof layer 8 is made of materials with explosion-proof functions.

[0033] The pressure relief buffer fixing member includes at least two strip-shaped long belts 3 and iron rings 2.

[0034] The strip-shaped long belts 3 are evenly arranged on the blanket body 1, and the strip-shaped long belts 3 can be fixed on the blanket body 1 by sewing or buttoning. The strip-shaped long belts 3 span across the upper surface of the blanket body 1 and extend out on the other side of the blanket body 1.

[0035] The end of the strip-shaped long belt 3 is provided with a quick-release fixing member 11, and the strip-shaped long belt 3 is provided with a telescopic section 4. The telescopic section 4 can be made of high-strength elastic fibers with an elastic modulus between 100 - 150 MPa to ensure effective telescoping. Therefore, the strip-shaped long belt 3 can be stretched as needed to adjust the required tension.

[0036] Optionally, the number of the strip-shaped long belts 3 can be set to 6, and the strip-shaped long belts are distributed in parallel. The width of each strip-shaped long belt can be 2 cm. Correspondingly, the number of the iron rings 2 can also be set to six.

[0037] Specifically, the iron ring 2 is made of stainless steel with an inner diameter of 2.5 cm, and the iron ring 2 is arranged at one end of the corresponding strip-shaped long belt 3.

[0038] The end of the strip-shaped long belt 3 is provided with a quick-release fixing member 11, and the quick-release fixing member 11 can be set to structures with functions of quick disassembly and fixing such as Velcro and snap buttons. Optionally, when the quick-release fixing member 11 is set to Velcro, the Velcro can be made of nylon material with strong adhesion and durability.

[0039] In the embodiment of the present application, the blanket body 1 with a multi-layer structure provides protection from different aspects. The fireproof outer layer 5 and the inner silicone rubber cloth can effectively resist external fires and fires caused by internal arcs; the soft protection layer 6 can buffer external impact forces and protect the internal structure; the electromagnetic shielding layer 7 prevents arcs from causing harm to surrounding equipment and personnel; the rigid explosion-proof layer 8 enhances the physical strength of the fireproof blanket and resists explosion impact forces. The cooperation among the strip-shaped long belts 3, the iron rings 2, and the quick-release fixing member 11 in the pressure relief buffer fixing member not only facilitates the fixing of the fireproof blanket, but also the telescopic section 4 can buffer the pressure when an arc explosion occurs at the cable joint, protect the integrity of the fireproof blanket, and ensure that it can still play a role during a secondary explosion.

[0040] In a possible embodiment, the convex structure inside the fireproof inner layer 9 is filled with fireproof caulking 10 for enhancing heat dissipation and suppressing the spread of fire.

[0041] In the design of the convex structure of the fireproof inner layer 9, there are gaps between the convex structures. The fireproof putty 10 is selected as a mixture of inorganic fireproof putty 10 and organic fireproof putty 10 in a ratio of 3:2, and it is ensured to fill the inside of the convex structure during filling.

[0042] Specifically, the convex structure can be a semi-circular convex, a triangular convex or a regular polygonal convex. In the embodiment of the present application, a semi-circular convex structure is preferably used, and the semi-circular convex structure can make the pressure distribution more uniform and reduce stress concentration.

[0043] When the cable joint generates heat during operation, the heat is transferred to the surface of the convex structure through the fireproof putty 10. Since the convex structure increases the surface area and the contact area with the air is increased, the heat dissipation is accelerated. At the same time, when a fire occurs inside, the fireproof putty 10 can effectively prevent the flame and heat from spreading outwards and prevent the fire from spreading to other cables.

[0044] In the embodiment of the present application, the fireproof inner layer 9 is filled with the fireproof putty 10 and adopts a convex structure, which significantly enhances the heat dissipation performance, effectively reduces the temperature of the cable joint, and improves the stability and safety of the cable operation. At the same time, the function of inhibiting the spread of fire can avoid large-scale spread of fire in the cable corridor, reduce the impact of fire on the entire power system, and ensure the normal operation of the power system.

[0045] In a possible embodiment, the fireproof inner layer 9 and the fireproof outer layer 5 are silicone rubber cloths.

[0046] Optionally, high-purity silicone rubber raw materials can be selected for the silicone rubber cloth, and appropriate additives such as flame retardants and reinforcing agents are added. Through processes such as mixing and vulcanization, a silicone rubber cloth with uniform thickness is made. When making the fireproof blanket, the silicone rubber cloth is cut into appropriate sizes and connected to other layers by hot pressing or sewing. In the cable laying scenario of an outdoor substation, using this kind of fireproof blanket to wrap the cable joint, the waterproof performance of the silicone rubber cloth can prevent rainwater from invading, and still maintain good fireproof performance in a humid environment.

[0047] In the embodiment of the present application, the silicone rubber cloth has good fireproof, waterproof and flexibility. As the fireproof inner layer 9 and the outer layer, it can effectively block the flame and prevent the fire from damaging the cable. Its waterproof performance can avoid faults such as short circuits caused by moisture invading the cable joint, and improves the applicability and reliability of the fireproof blanket in different environments.

[0048] In a possible embodiment, the electromagnetic shielding layer 7 is a polytetrafluoroethylene arc-resistant cloth.

[0049] The polytetrafluoroethylene arc-resistant cloth of the electromagnetic shielding layer 7 is made by a special textile process, with fibers closely arranged and uniform thickness.

[0050] When manufacturing the fireproof blanket, lay it between the soft protective layer 6 and the hard explosion-proof layer 8 to ensure complete coverage of the area where electric arcs may be generated at the cable joints. When using this fireproof blanket at the cable connection part inside the power switchgear, when an electric arc occurs, the polytetrafluoroethylene anti-arc cloth can effectively shield the high temperature and strong electric field generated by the electric arc, protecting the surrounding equipment and personnel safety.

[0051] In the embodiment of the present application, the electromagnetic shielding layer 7 is set as polytetrafluoroethylene anti-arc cloth, which has excellent anti-arc performance, can effectively block the high temperature and strong electric field generated by the electric arc, prevent the damage of the electric arc to other layer structures of the fireproof blanket, ensure the normal use of the fireproof blanket in the electric arc environment, and improve the safety of the power system operation.

[0052] In a possible embodiment, the material of the hard explosion-proof layer 8 is set as steel plate.

[0053] Optionally, the material of the hard explosion-proof layer 8 is set as 316 steel plate. Through processes such as cutting and stamping, it is made into a component adapted to the shape of the blanket body 1, with uniform thickness, and the edges are polished to prevent scratching other layer structures.

[0054] When installing it on the fireproof blanket, it is firmly connected to other layers by means of welding or strong glue. If an explosion occurs at the cable joint, the hard explosion-proof layer 8 made of 316 steel plate can effectively resist the impact force generated by the explosion and protect other cables.

[0055] In the embodiment of the present application, the material of the hard explosion-proof layer 8 is set as steel plate, which has high strength and good high-temperature resistance. As the hard explosion-proof layer 8, it can withstand a huge impact force when an explosion occurs at the cable joint, prevent the fireproof blanket from being torn, protect the internal structure and surrounding cables, reduce the damage of the explosion to the power facilities, and ensure the stable operation of the power system.

[0056] In a possible embodiment, the soft protective layer 6 is a fabric made of a blend of polyimide and aramid.

[0057] Specifically, the soft protective layer 6 is set as a fabric made of a blend of polyimide and aramid. During the textile process, the ratio of the two fibers and the textile process are strictly controlled to ensure the strength and protective performance of the fabric. The made fabric has uniform thickness and a flat surface.

[0058] When manufacturing the fireproof blanket, lay it between the fireproof outer layer 5 and the electromagnetic shielding layer 7, and connect it tightly to other layers by means of sewing or hot pressing. In the industrial production scenarios where the cables are frequently vibrated, the soft protective layer 6 can effectively buffer the vibration and protect the internal electromagnetic shielding layer 7 and hard explosion-proof layer 8 from being damaged.

[0059] In the embodiment of the present application, the flexible protective layer 6 made of a blend of polyimide and aramid has good flexibility and strength, can buffer external impact forces, protect the internal electromagnetic shielding layer 7 and the hard explosion-proof layer 8, and extend the service life of the fireproof blanket. At the same time, the flexible protective layer 6 has a certain fireproof and arc protection ability, enhancing the overall protection performance of the fireproof blanket.

[0060] In a possible embodiment, the installation method of the cable fireproof blanket includes the following steps: When installing the cable fireproof blanket, first clean the surface of the cable joint to remove impurities such as dust and oil. Then wrap the blanket body 1 around the cable joint one and a half times to ensure that the cable joint is completely covered. Adjust the strip-shaped long belt 3 in sequence, pass it through the corresponding iron rings 2 respectively, and after adjusting the position, fix the quick-release fastener 11 at the end of the strip-shaped long belt 3 to the fireproof blanket through the iron ring 5.

[0061] Next, by stretching or contracting the telescopic section 4, make the fireproof blanket closely fit the cable joint. After adjusting the tightness, check the fixing condition of the quick-release fastener 11 again to ensure firm fixation and keep the fireproof blanket in a good fixed state all the time.

[0062] In the embodiment of the present application, this installation method is simple and convenient to operate, and can ensure that the fireproof blanket is accurately and firmly installed on the cable joint. The requirement of wrapping around the cable joint for more than one week ensures the full coverage of the cable joint by the fireproof blanket. The combined use of the telescopic strip-shaped long belt 3 and the quick-release fastener 11 facilitates the adjustment of the tightness, makes the fireproof blanket closely fit the cable joint, and improves the protection effect and stability of the fireproof blanket.

[0063] In a possible embodiment, the pressure relief method of the cable fireproof blanket includes the following steps: When an arc explosion occurs at the cable joint, assuming the expansion pressure reaches 0.5 MPa, the fireproof blanket expands rapidly. At this time, the telescopic section 4 is stretched, and its elastic deformation absorbs part of the pressure. The strip-shaped long belt 3 transfers the remaining pressure to the fireproof inner layer 9, and the square-shaped concave-convex structure of the fireproof inner layer 9 undergoes slight deformation. At the same time, the air in the structure is compressed and flows, dispersing and releasing the impact force. For example, in a cable fault simulation test, after such a pressure relief process, the pressure received by the fireproof blanket decreased by 80%. After pressure relief, the strip-shaped long belt 3 contracts by virtue of its own elastic restoring force, making the fireproof blanket tightly wrap the cable joint again, ready to deal with possible secondary explosions.

[0064] In the embodiments of the present application, this pressure relief method can effectively buffer the expansion pressure generated by the arc explosion of the cable joint and protect the structural integrity of the fireproof blanket. By releasing the impact force through the special structure of the fireproof inner layer 9, the damage to the fireproof blanket caused by the pressure is avoided, ensuring that the fireproof blanket can still maintain the wrapped state of the cable joint after pressure relief, providing protection for secondary explosion, and improving the reliability and safety of the fireproof blanket.

[0065] In a possible embodiment, the heat dissipation method of this cable fireproof blanket includes the following steps: During the operation of the cable, assume that the heat generated by the cable joint makes the local temperature reach 60°C. Multiple air gaps are formed between the square bumpy structure of the fireproof inner layer 9 and the cable joint, and these air gaps increase the heat dissipation area. The fireproof sealant 10 filled inside conducts the heat from the cable joint to the surface of the square block, and then through the way of air convection, the heat is dissipated into the surrounding environment. After running for a period of time, the temperature of the cable joint stabilizes at about 40°C, effectively preventing the accumulation of local temperature. In a cable tray, the temperature of the cable joint using this fireproof blanket is significantly lower than that of the cable joint without using it.

[0066] In the embodiments of the present application, this heat dissipation method utilizes the special structure of the fireproof inner layer 9 and the heat conduction performance of the fireproof sealant 10 to increase the air gap with the cable joint, promote air convection, effectively dissipate the heat generated by the cable joint, prevent the local temperature from being too high, ensure the normal operation of the cable, and extend the service life of the cable.

[0067] In a possible embodiment, the secondary protection method of this cable fireproof blanket includes the following steps: When the first explosion occurs, assume that the explosion impact force is 2 MPa. The rigid explosion-proof layer 8, relying on its high-strength steel plate structure, resists most of the explosion impact force and maintains the overall shape of the fireproof blanket. The electromagnetic shielding layer 7 blocks the arc and prevents the arc from damaging other layers. The fireproof outer layer 5 and the soft protection layer 6 work together to disperse the impact force and prevent the blanket body 1 from being torn.

[0068] For example, in an actual cable explosion accident, the various layer structures of this fireproof blanket cooperate effectively, resulting in only slight damage to the fireproof blanket. After pressure relief, the blanket body 1 automatically resets under the elastic restoring force of the telescopic section of the strip-shaped long belt 3 and continues to tightly wrap the cable joint. When the secondary explosion occurs, the fireproof blanket can still play a protective role and protect the cable and surrounding equipment.

[0069] In the embodiments of the present application, this secondary protection method, through the collaborative action of the various layer structures, effectively resists the damage of the first explosion, ensures that the fireproof blanket can automatically reset after pressure relief, continues to provide protection for the cable joint, improves the protection ability of the fireproof blanket under multiple explosion conditions, and guarantees the safe operation of the power system.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: modifying the technical solutions recorded in the foregoing embodiments, or equivalently replacing some or all of the technical features therein, does not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A cable fire blanket, characterized in that: It comprises a blanket body (1) and a pressure relief buffer fixing part; The blanket body (1) comprises, from the outside to the inside, a fireproof outer layer (5), a soft protective layer (6), an electromagnetic shielding layer (7), a hard explosion-proof layer (8) and a fireproof inner layer (9); The fireproof inner layer (9) is configured as a convex structure; The pressure relief buffer fixing member comprises at least two strip-shaped long belts (3) and an iron ring (2); The upper surface of the blanket body (1) is provided with a strip-shaped long belt (3), one end of the strip-shaped long belt (3) is provided with an iron ring (2), and the strip-shaped long belt (3) spans the upper surface of the blanket body (1) and extends out from the other side of the blanket body (1); A quick-release fixing piece (11) is provided at the end of the strip-shaped long belt (3), and a telescopic section (4) is provided on the strip-shaped long belt (3).

2. The cable fire blanket according to claim 1, characterized in that: The raised structure of the fireproof inner layer (9) is filled with fireproof plugging material (10) to enhance heat dissipation and inhibit the spread of fire.

3. The cable fire blanket according to claim 1, characterized in that: The fireproof inner layer (9) and the fireproof outer layer (5) are silicone rubber cloth.

4. The cable fire blanket according to claim 1, characterized in that: The electromagnetic shielding layer (7) is polytetrafluoroethylene arc-resistant cloth.

5. The cable fire blanket according to claim 1, characterized in that: The material of the hard explosion-proof layer (8) is set to be a steel plate.

6. The cable fire blanket according to claim 1, characterized in that: The soft protective layer (6) is a fabric made of a blend of polyimide and aramid.

7. A method for installing a cable fire blanket according to any one of claims 1 to 6, characterized in that: The following steps are involved: Wrap the blanket (1) around the cable connector for more than one circle to ensure that the cable connector is completely covered; Pass the strip-shaped long belt (3) through the iron ring (2) and fix it with a quick-release fixing piece (11); The tightness is adjusted by the telescopic section (4) to ensure that the blanket body (1) fits tightly against the cable connector.

8. A pressure relief method for a cable fire blanket according to any one of claims 1 to 6, characterized in that: The following steps are involved: When an arc explosion occurs at the cable joint, the expansion pressure causes the blanket body (1) to expand; The telescopic section (4) buffers the pressure and transmits the pressure to the fireproof inner layer (9), and the convex structure of the fireproof inner layer (9) releases the impact force through deformation and air circulation; After the pressure is released, the elastic restoring force of the strip-shaped long belt (3) enables the blanket body (1) to tightly wrap the cable joint again to cope with secondary combustion and explosion.

9. A heat dissipation method based on the cable fire blanket according to any one of claims 1 to 6, characterized in that: The following steps are involved: The raised structure of the fireproof inner layer (9) increases the air gap with the cable joint; The fireproof plugging material (10) filled inside assists heat conduction from the cable joint to the outside of the blanket body (1), and dissipates heat through air convection, thereby preventing local temperature accumulation.

10. A secondary protection method for a cable fire blanket based on any one of claims 1 to 6, characterized in that: The following steps are involved: When the first explosion occurs, the hard explosion-proof layer (8) resists the explosion impact force, the electromagnetic shielding layer (7) blocks the arc, and the fireproof outer layer (5) and the soft protective layer (6) work together to prevent the blanket body (1) from being torn; After the pressure is released, the blanket body (1) automatically resets to maintain the wrapped state of the cable connector, ensuring that the blanket still has the protective capability in the event of a secondary explosion.

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