A fire-resistant metal-sheathed insulated polyethylene cable

Abstract

This invention relates to cross-linked polyethylene insulated power cables and cable accessories, and more specifically to the field of power cables. It proposes a fire-resistant metal-sheathed insulated polyethylene cable comprising a cooling air inlet pipe, conductive components, a metal sheath assembly, a pneumatic fire extinguishing assembly, and a reinforced cooling assembly. Several conductive components are arranged at equal angles around the cooling air inlet pipe. The metal sheath assembly is fitted over the conductive components. A ceramicized silicone rubber layer fills the space between the conductive components and the metal sheath assembly. Several sealed fireproof cavities are evenly spaced between the metal sheath assembly and the ceramicized silicone rubber layer. Several pneumatic fire extinguishing cavities are provided, each corresponding to one of the sealed fireproof cavities. This technical solution solves the problem of poor heat dissipation efficiency in existing fire-resistant metal-sheathed insulated polyethylene cables under high-temperature and flammable environments.

Description

Technical Field

[0001] This invention relates to cross-linked polyethylene insulated power cables and cable accessories, and more specifically to the field of power cables, particularly to a fire-resistant metal-sheathed insulated polyethylene cable. Background Technology

[0002] In the field of power transmission, fire-resistant metal-sheathed insulated polyethylene cables play a crucial role, especially in high-temperature and flammable environments, where their performance directly affects the stability and safety of power supply.

[0003] Nowadays, with the development of industrial production, extremely stringent requirements are placed on the fire resistance and heat dissipation performance of cables in high-temperature operating areas such as steel plants, smelting workshops, and boiler rooms, as well as in flammable environments such as oil depots and chemical plants. Currently, most fire-resistant metal-sheathed insulated polyethylene cables on the market still use traditional structures when dealing with high-temperature and flammable environments. Their insulation layer is usually made of polyethylene material, which has certain insulation performance, but its thermal conductivity is low at high temperatures, making it difficult to dissipate heat effectively. Although the metal sheath enhances fire resistance and mechanical protection, it absorbs a large amount of heat in high-temperature environments due to the thermal conductivity of metal, and cannot conduct it to the outside in time, causing heat to accumulate inside the cable.

[0004] When the cable body is subjected to long-term and continuous high temperatures, it will not only accelerate the aging and degradation of the polyethylene insulation layer, reducing its insulation performance and increasing the probability of electrical faults such as leakage and short circuits, seriously threatening the safe operation of the power system, but also cause the metal sheath to deform, reducing its mechanical protection performance, making the cable more susceptible to external mechanical damage, shortening the cable's service life, and increasing maintenance costs and safety hazards. Summary of the Invention

[0005] This invention proposes a fire-resistant metal-sheathed insulated polyethylene cable to solve the problem mentioned in the background art, where existing fire-resistant metal-sheathed insulated polyethylene cables have poor heat dissipation efficiency in high-temperature and flammable environments.

[0006] The technical solution of the present invention is as follows: a fire-resistant metal-sheathed insulated polyethylene cable, comprising a cooling air inlet pipe, a conductive component, a metal sheath assembly, a pneumatic fire extinguishing component, and an enhanced cooling component;

[0007] The conductive components are provided in several units, and the conductive components are distributed at equal angles around the cooling air inlet pipe.

[0008] The metal sheath assembly is sleeved on several of the conductive components, and a ceramicized silicone rubber layer is filled between the conductive components and the metal sheath assembly. Several sealed fireproof cavities are provided at equal intervals between the metal sheath assembly and the ceramicized silicone rubber layer.

[0009] The pneumatic fire extinguishing assembly is provided in several units, and each pneumatic fire extinguishing assembly corresponds to a sealed fireproof chamber. One end of the pneumatic fire extinguishing assembly is connected to the cooling air inlet pipe, and the other end passes through the ceramicized silicone rubber layer to the sealed fireproof chamber shown.

[0010] The enhanced cooling component is provided in several parts, and the enhanced cooling component is connected to the cooling air inlet pipe. Each enhanced cooling component is located between two adjacent pneumatic fire extinguishing components.

[0011] Based on the aforementioned scheme, the conductive component includes a conductive wire assembly and an insulating polyethylene layer;

[0012] The insulating polyethylene layer is sleeved on the conductive wire assembly.

[0013] Based on the aforementioned scheme, the metal sheath assembly includes a metal layer and an annular fireproof ring;

[0014] The metal layer is sealed and fitted onto the ceramicized silicone rubber layer;

[0015] The annular fireproof ring is provided in several parts, and each annular fireproof ring corresponds to a pneumatic fire extinguishing component. The annular fireproof ring is sleeved on the metal layer, and a sealed fireproof cavity is formed between the metal layer and the annular fireproof ring. One end of the pneumatic fire extinguishing component extends into the sealed fireproof cavity.

[0016] As a preferred embodiment of the present invention, the pneumatic fire extinguishing assembly includes a plurality of pneumatic fire extinguishing parts;

[0017] The pneumatic fire extinguishing unit corresponds one-to-one with the conductive component. Several pneumatic fire extinguishing units are connected at equal angles on the cooling air inlet pipe, and each conductive component is located between two adjacent pneumatic fire extinguishing units.

[0018] Furthermore, based on the aforementioned scheme, the pneumatic fire extinguishing unit includes a fire extinguishing pipe, a jet pipe, and a vibrating spring.

[0019] One end of the fire extinguishing pipe is connected to the cooling air inlet pipe, and the other end is provided with a fire extinguishing cylinder. The open end of the fire extinguishing cylinder is located inside the sealed fireproof cavity.

[0020] The jet pipe is installed inside the fire extinguishing tube, and one end of the jet pipe is connected to the fire extinguishing tube;

[0021] The vibrating spring is disposed at the open end of the fire extinguishing tube.

[0022] As a preferred technical solution of this disclosure, the enhanced cooling component includes a convex cooling tube and a cooling baffle;

[0023] The convex cooling tube is provided in several parts, and the convex cooling tube corresponds one to one with the fire extinguishing tube. Both ends of the convex cooling tube are connected to the cooling air inlet pipe, and each convex cooling tube is located between two adjacent fire extinguishing tubes.

[0024] The cooling baffle is sealed inside the cooling air inlet pipe, and the two ends of the convex cooling pipe are located on both sides of the cooling baffle.

[0025] Based on the aforementioned scheme, air delivery components are provided on both sides of the cooling air inlet pipe;

[0026] The gas delivery assembly includes a gas cylinder and a gas delivery pipe;

[0027] One end of the gas cylinder is connected to a gas supply pipe, and one end of the gas supply pipe can be detachably connected to one end of the cooling air inlet pipe by means of a buckle.

[0028] The gas delivery pipe is connected to the other end of the gas delivery cylinder, and a gas flow meter is installed on the gas delivery pipe.

[0029] Furthermore, each of the aforementioned gas cylinders is equipped with a temperature detection sensor.

[0030] The beneficial effects of this invention are as follows:

[0031] 1. In this invention, by setting up a cooling air inlet pipe, a gas delivery component, and an enhanced cooling component, carbon dioxide cooling gas can be delivered into the cooling air inlet pipe through one of the gas delivery components when the cable is in use. Through the obstruction of the cooling baffle, the gas can flow sequentially along the convex cooling pipe and the cooling air inlet pipe. The flow of gas carries away the heat generated during cable operation, achieving a cooling effect on the cable.

[0032] 2. In this invention, by setting a ceramicized silicone rubber layer, a hard ceramic-like shell can be formed at high temperatures, effectively isolating flames and heat conduction. By setting a sealed fireproof cavity and a metal sheath assembly, the metal layer and the annular fireproof ring not only provide solid physical protection against external mechanical impacts, compression, and other external forces, protecting the internal conductive components and fireproof structure from damage, but also, when the annular fireproof ring is damaged, the gas in the cooling air intake pipe can be discharged from the damaged area of ​​the annular fireproof ring under pressure through the fire extinguishing pipe, the jet pipe, and the sealed fireproof cavity. When the gas flows through the jet pipe, the flowing gas will pass through the vibrating spring, causing the vibrating spring to vibrate at high speed and generate a whistle sound, so as to ensure that the staff can quickly locate the damaged location and repair it in time. Attached Figure Description

[0033] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0034] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0035] Figure 2 This is a schematic diagram of a partial cross-section of the present invention;

[0036] Figure 3 For the present invention Figure 2 A magnified schematic diagram of the local structure at point A;

[0037] Figure 4 For the present invention Figure 2 A magnified view of the structure at point B in the middle;

[0038] Figure 5 This is a schematic diagram of the structure of the cooling air inlet pipe, the pneumatic fire extinguishing component, and the enhanced cooling component in this invention.

[0039] Figure 6 This is a partial cross-sectional structural schematic diagram of the pneumatic fire extinguishing unit in this invention;

[0040] Figure 7 This is a partial cross-sectional view of the structure of the cooling intake pipe and the enhanced cooling component in this invention.

[0041] Figure 8 This is a schematic diagram of the gas delivery assembly in this invention.

[0042] In the diagram: 001, conductive component; 002, metal sheath assembly; 003, pneumatic fire extinguishing assembly; 004, enhanced cooling assembly; 005, gas delivery assembly;

[0043] 1. Cooling air inlet pipe; 2. Ceramicized silicone rubber layer; 3. Conductive wire assembly; 4. Insulating polyethylene layer; 5. Metal layer; 6. Annular fireproof ring; 7. Sealed fireproof cavity; 8. Fire extinguishing pipe; 9. Fire extinguishing tube; 10. Air jet pipe; 11. Vibrating spring; 12. Convex cooling pipe; 13. Cooling baffle; 14. Gas delivery cylinder; 15. Gas supply pipe; 16. Clip; 17. Gas delivery pipe; 18. Gas flow meter; 19. Temperature detection sensor. Detailed Implementation

[0044] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0045] Examples, such as Figures 1 to 8As shown, the present invention provides a fire-resistant metal-sheathed insulated polyethylene cable belonging to the category of cross-linked polyethylene insulated power cables and cable accessories. The fire-resistant metal-sheathed insulated polyethylene cable includes a cooling air inlet pipe 1, a conductive component 001, a metal sheath assembly 002, a pneumatic fire extinguishing component 003, and an enhanced cooling component 004.

[0046] The conductive component 001 is provided in several parts, and the conductive components 001 are distributed at equal angles around the cooling air inlet pipe 1. The conductive component 001 includes a conductive wire group 3 and an insulating polyethylene layer 4, with the insulating polyethylene layer 4 sleeved on the conductive wire group 3.

[0047] Specifically, the structure of conductive wire group 3 combined with insulating polyethylene layer 4 has excellent electrical insulation properties, which can effectively prevent leakage of conductive wire group 3, ensure stable current transmission, reduce the risk of fire or equipment failure caused by leakage, and improve the safety and reliability of cable use.

[0048] As described above, the metal sheath assembly 002 is fitted onto several conductive components 001. A ceramicized silicone rubber layer 2 is filled between the conductive components 001 and the metal sheath assembly 002. Several sealed fireproof cavities 7 are provided at equal intervals between the metal sheath assembly 002 and the ceramicized silicone rubber layer 2. The metal sheath assembly 002 includes a metal layer 5 and an annular fireproof ring 6. The metal layer 5 is sealed onto the ceramicized silicone rubber layer 2. Several annular fireproof rings 6 are provided. Each annular fireproof ring 6 corresponds to a pneumatic fire extinguishing component 003. The annular fireproof ring 6 is fitted onto the metal layer 5. A sealed fireproof cavity 7 is formed between the metal layer 5 and the annular fireproof ring 6. One end of the pneumatic fire extinguishing component 003 extends into the sealed fireproof cavity 7.

[0049] Among them, the metal layer 5 and the annular fireproof ring 6 not only provide solid physical protection, resisting external mechanical impacts, extrusion and other external forces, protecting the internal conductive components 001 and fireproof structure from damage, but also form a hard ceramic-like shell at high temperatures by setting the ceramicized silicone rubber layer 2, effectively isolating flames and heat conduction.

[0050] The above-mentioned pneumatic fire extinguishing assembly 003 is provided in several units, and each pneumatic fire extinguishing assembly 003 corresponds one-to-one with the sealed fireproof chamber 7. One end of the pneumatic fire extinguishing assembly 003 is connected to the cooling air inlet pipe 1, and the other end passes through the ceramicized silicone rubber layer 2 into the sealed fireproof chamber 7. The pneumatic fire extinguishing assembly 003 includes several pneumatic fire extinguishing parts, each of which corresponds one-to-one with the conductive component 001. The several pneumatic fire extinguishing parts are connected at equal angles on the cooling air inlet pipe 1. Each conductive component 001 is located between two adjacent pneumatic fire extinguishing parts. Each pneumatic fire extinguishing part includes a fire extinguishing pipe 8, a jet pipe 10, and a vibrating spring 11. One end of the fire extinguishing pipe 8 is connected to the cooling air inlet pipe 1, and the other end is provided with a fire extinguishing cylinder 9. The open end of the fire extinguishing cylinder 9 is located in the sealed fireproof chamber 7. The jet pipe 10 is installed through the fire extinguishing cylinder 9. One end of the jet pipe 10 is connected to the fire extinguishing pipe 8. The vibrating spring 11 is located at the open end of the fire extinguishing cylinder 9.

[0051] Specifically, when the annular fireproof ring 6 is damaged, the gas in the cooling air inlet pipe 1, under pressure, can be discharged from the damaged part of the annular fireproof ring 6 through the fire extinguishing pipe 8, the jet pipe 10 and the sealed fireproof cavity 7. When the gas flows through the jet pipe 10, the flowing gas will pass through the vibrating spring 11, causing the vibrating spring 11 to vibrate at high speed and generate a whistle sound, so as to ensure that the staff can quickly locate the damaged position and repair it in time.

[0052] It should be further explained that by setting the fire extinguishing tube 9, not only can the internal cavity of the cable be increased and the weight of the cable body be reduced, but also during the cable manufacturing process, the probability of ceramicized silicone rubber material entering the air jet pipe 10 and causing blockage of the air jet pipe 10 can be reduced. Furthermore, when the vibrating spring 11 vibrates, the sound can reverberate in the fire extinguishing tube 9, further increasing the volume of the siren and facilitating warning operations.

[0053] The aforementioned enhanced cooling component 004 is provided in several units. The enhanced cooling component 004 is connected to the cooling air inlet pipe 1. Each enhanced cooling component 004 is located between two adjacent pneumatic fire extinguishing components 003. The enhanced cooling component 004 includes a convex cooling pipe 12 and a cooling baffle 13. There are several convex cooling pipes 12. Each convex cooling pipe 12 corresponds to a fire extinguishing pipe 8. Both ends of the convex cooling pipe 12 are connected and installed on the cooling air inlet pipe 1. Each convex cooling pipe 12 is located between two adjacent fire extinguishing pipes 8. The cooling baffle 13 is sealed inside the cooling air inlet pipe 1. The two ends of the convex cooling pipe 12 are located on both sides of the cooling baffle 13.

[0054] Specifically, by setting up a convex cooling pipe 12 and a cooling baffle 13, when the cooling gas flows in the cooling inlet pipe 1, the gas can flow sequentially along the convex cooling pipe 12 and the cooling inlet pipe 1 through the obstruction of the cooling baffle 13. The flow of gas carries away the heat generated during the operation of the cable, thereby achieving the cooling effect on the cable.

[0055] By setting the convex cooling tube 12, the flow path of gas inside the cable can be further increased, which facilitates the carrying of more heat generated in the cable and further improves the cooling efficiency of the cable.

[0056] It should be noted that both sides of the cooling air inlet pipe 1 are provided with air delivery components 005, which include air delivery cylinder 14 and air delivery pipe 17.

[0057] One end of the gas cylinder 14 is connected to the gas supply pipe 15. One end of the gas supply pipe 15 can be detachably connected to one end of the cooling inlet pipe 1 via a buckle 16. The gas supply pipe 17 is connected to the other end of the gas cylinder 14. A gas flow meter 18 is installed on the gas supply pipe 17, and a temperature detection sensor 19 is installed on each gas cylinder 14.

[0058] Specifically, the gas cylinder 14 is detachably connected to the cooling gas inlet pipe 1 via the gas supply pipe 15, which not only facilitates the delivery and replenishment of gas, but also makes installation and disassembly more convenient through the snap-fit ​​connection 16. The gas flow meter 18 installed on the gas supply pipe 17 can monitor the gas flow in real time to ensure a stable supply of cooling gas. By setting a temperature detection sensor 19, the cable operating temperature can be monitored in real time, and abnormal temperatures can be detected in a timely manner, making it easier for staff to take corresponding measures and achieve comprehensive monitoring and effective management of the cable operating status.

[0059] To further clarify, once the cable is put into use, the conductive component 001 is responsible for current transmission, and the insulating polyethylene layer 4 ensures transmission safety. When heat is generated during cable operation, cooling gas flows along the convex cooling pipe 12 and the cooling air inlet pipe 1 under the action of the cooling baffle 13, carrying heat to achieve cooling. If the annular fireproof ring 6 is damaged, the gas in the cooling air inlet pipe 1 is discharged through the pneumatic fire extinguishing component 003, and the vibrating spring 11 generates a whistle to alert the staff. The gas flow meter 18 and temperature detection sensor 19 of the gas delivery component 005 work continuously to monitor the gas flow and cable temperature in real time. Once an abnormality occurs, an early warning is issued in time, and the staff can maintain and repair the cable as needed to ensure the safe and stable operation of the cable.

[0060] The above are merely 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 within the protection scope of the present invention.

Claims

1. A fire-resistant metal-sheathed insulated polyethylene cable, characterized in that, include: Cooling air intake pipe (1); A plurality of conductive components (001) are provided, and the plurality of conductive components (001) are distributed at equal angles around the cooling air inlet pipe (1); A metal sheath assembly (002) is fitted onto several conductive components (001). A ceramicized silicone rubber layer (2) is filled between the conductive components (001) and the metal sheath assembly (002). Several sealed fireproof cavities (7) are provided at equal intervals between the metal sheath assembly (002) and the ceramicized silicone rubber layer (2). A number of pneumatic fire extinguishing components (003) are provided. Each pneumatic fire extinguishing component (003) corresponds to a sealed fireproof cavity (7). One end of each pneumatic fire extinguishing component (003) is connected to the cooling air inlet pipe (1), and the other end passes through the ceramicized silicone rubber layer (2) into the sealed fireproof cavity (7). A plurality of enhanced cooling components (004) are provided. The enhanced cooling components (004) are connected to the cooling air inlet pipe (1). Each enhanced cooling component (004) is located between two adjacent pneumatic fire extinguishing components (003). The conductive component (001) includes: Conductive wire assembly (3); An insulating polyethylene layer (4) is sleeved on the conductive wire assembly (3); The metal sheath assembly (002) includes: The metal layer (5) is sealed on the ceramicized silicone rubber layer (2); A plurality of annular fireproof rings (6) are provided, and the annular fireproof rings (6) correspond one-to-one with the pneumatic fire extinguishing components (003). The annular fireproof rings (6) are sleeved on the metal layer (5), and a sealed fireproof cavity (7) is formed between the metal layer (5) and the annular fireproof rings (6). One end of the pneumatic fire extinguishing components (003) extends into the sealed fireproof cavity (7). The pneumatic fire extinguishing assembly (003) includes: The pneumatic fire extinguishing unit is provided in several parts, and each pneumatic fire extinguishing unit corresponds one-to-one with the conductive component (001). The several pneumatic fire extinguishing units are connected at equal angles on the cooling air inlet pipe (1), and each conductive component (001) is located between two adjacent pneumatic fire extinguishing units. The pneumatic fire extinguishing unit includes: The fire extinguishing pipe (8) has one end connected to the cooling air inlet pipe (1) and the other end is equipped with a fire extinguishing cylinder (9). The open end of the fire extinguishing cylinder (9) is located inside the sealed fireproof cavity (7). A jet pipe (10) is installed inside the fire extinguishing tube (9), and one end of the jet pipe (10) is connected to the fire extinguishing tube (8); A vibrating spring (11) is provided at the open end of the fire extinguishing tube (9).

2. The fire-resistant metal-sheathed insulated polyethylene cable according to claim 1, characterized in that, The enhanced cooling component (004) includes: A plurality of convex cooling pipes (12) are provided, and the convex cooling pipes (12) correspond one-to-one with the fire extinguishing pipes (8). Both ends of the convex cooling pipes (12) are connected to the cooling air inlet pipe (1), and each convex cooling pipe (12) is located between two adjacent fire extinguishing pipes (8). The cooling baffle (13) is sealed inside the cooling air inlet pipe (1), and the two ends of the convex cooling pipe (12) are located on both sides of the cooling baffle (13).

3. A fire-resistant metal-sheathed insulated polyethylene cable according to claim 2, characterized in that, Both sides of the cooling air inlet pipe (1) are provided with air delivery components (005); The gas delivery assembly (005) includes: The gas cylinder (14) has a gas delivery pipe (15) connected to one end. One end of the gas delivery pipe (15) can be detachably connected to one end of the cooling air inlet pipe (1) by means of a buckle (16). A gas delivery pipe (17) is connected to the other end of the gas delivery cylinder (14), and a gas flow meter (18) is installed on the gas delivery pipe (17).

4. A fire-resistant metal-sheathed insulated polyethylene cable according to claim 3, characterized in that, Each of the gas cylinders (14) is equipped with a temperature detection sensor (19).

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