Fire extinguishing system for preventing fire diffusion

Abstract

The fire extinguishing system comprises an upper fire extinguishing device and a lower fire extinguishing device, one end of the upper fire extinguishing device is provided with an upper fire extinguishing supply pipe, the upper fire extinguishing supply pipe supplies fire into a cable tunnel body, and an inner supporting ring is fixedly arranged on the inner wall of the cable tunnel body. The upper fire extinguishing supply pipe and the lower fire extinguishing supply pipe are arranged in the cable tunnel body, the upper fire extinguishing supply pipe is provided with the anti-diffusion fire extinguishing pipe and the rotating spray head, the rotating spray head is mainly used for conducting fire extinguishing treatment on local positions of a cable, and the anti-diffusion fire extinguishing pipe can form a protection curtain structure in the cable tunnel body; a protection section is formed between the two curtains, fire extinguishing protection is carried out on one section of the cable tunnel, fire spreading is effectively obstructed, meanwhile, the lower fire extinguishing supply pipe can spray out carbon dioxide, the oxygen content in air is reduced, the fire extinguishing effect is further improved through vertical cooperation, and fire spreading is prevented at the same time.

Description

Technical Field

[0001] The invention belongs to the technical field of electric power, and in particular relates to a fire extinguishing system for preventing fire from spreading. Background Art

[0002] In the power system, the application scope of cable tunnels is getting wider and wider, providing convenience for people's lives, but there are also some problems. Among them, the explosion of cable joints causing fires in cable tunnels is the most serious problem. The causes of fires in cable tunnels can be divided into two categories: one is a fire caused by external fire sources, because the cable tunnel is closed and isolated from the outside. The other is a fire accident caused by cable body failure, among which 70% of cable accidents are caused by cable joint failure. The reason is that the manufacturing process of the cable intermediate joint is rough, the manufacturing quality is poor, the crimping joint is not tight, the contact resistance is too large, the cable insulation or cable core is damp, etc. During long-term operation, the temperature of the cable intermediate joint rises until it overheats and burns through the insulation. Application number: CN202111478150.X discloses a cable joint fire monitoring and automatic fire extinguishing system, which uses the same fire extinguishing device to extinguish multiple cable joints on demand, and the background monitoring can predict the occurrence of fire in advance, perform maintenance in advance, avoid the occurrence of fire, and ensure the safe and reliable operation of the power system. The device sets a shell at the cable joint position, connects the supply pipeline of the fire extinguishing material to the shell, and effectively extinguishes the fire at the cable joint position in the shell. However, for cables at other positions in the cable tunnel, effective fire extinguishing protection cannot be performed. The insulation layer in the cable is usually flammable. Once the cable catches fire, it will burn along the entire cable. Therefore, only local positions of the cable joints are provided with fire extinguishing protection, and the safety performance needs to be improved.

[0003] In view of this, the present invention is proposed. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a fire extinguishing system to prevent the spread of fire. To solve the above technical problem, the basic concept of the technical solution adopted by the present invention is: A fire extinguishing system for preventing the spread of fire, comprising an upper fire extinguishing device and a lower fire extinguishing device, wherein an upper fire extinguishing supply pipe is arranged at one end of the upper fire extinguishing device, the upper fire extinguishing supply pipe is supplied to a cable tunnel body, an inner support ring is fixedly arranged on the inner wall of the cable tunnel body, the upper fire extinguishing supply pipe is arranged at the top position of the inner support ring, a cable support frame is fixedly arranged on the side of the inner support ring, a cable fixing seat is arranged on the cable support frame, a cable is passed through the cable fixing seat, a cable joint protective shell is arranged at the joint position of the cable, a monitoring box is fixedly arranged on the side wall of the cable tunnel body on the side of the cable joint protective shell, the upper fire extinguishing supply pipe is connected to the cable A branch pipe is extended to the side at a position corresponding to the joint protective shell, a nozzle control valve is installed on the branch pipe, a rotating nozzle is installed at the end of the branch pipe, a monitoring camera is installed near the top of the cable tunnel body, a non-diffusion fire-extinguishing pipe is extended downward from the upper fire-extinguishing supply pipe, a non-diffusion upper nozzle is arranged on the non-diffusion fire-extinguishing pipe, a lower fire-extinguishing protection compartment is arranged in the middle of the bottom of the cable tunnel body, a lower fire-extinguishing supply pipe is arranged at one end of the lower fire-extinguishing device, the lower fire-extinguishing supply pipe extends into the lower fire-extinguishing protection compartment, a lower fire-extinguishing branch pipe is arranged in the section of the lower fire-extinguishing supply pipe located in the lower fire-extinguishing protection compartment, and a lower fire-extinguishing nozzle is installed on the lower fire-extinguishing branch pipe.

[0005] As a further solution of the present invention: a plurality of groups of lower fire extinguishing branch pipes are arranged on the lower fire extinguishing supply pipe, the lower fire extinguishing branch pipes are arranged at equal intervals, a plurality of lower fire extinguishing nozzles are arranged on the lower fire extinguishing branch pipes, the bottom of the lower fire extinguishing protection compartment is a curved structure, and a fixing buckle is provided in the lower fire extinguishing protection compartment for fixing the position of the lower fire extinguishing branch pipes.

[0006] As a further solution of the present invention: a cover plate mounting groove is provided at the upper end of the lower fire extinguishing protection compartment, and the cover plate mounting groove is a stepped groove structure. A lower cover plate is provided at the lower part of the cover plate mounting groove, and an upper cover plate is provided above the lower cover plate. The width dimension of the lower cover plate is smaller than the width dimension of the upper cover plate, an upper air vent is provided on the upper cover plate, and a lower air vent is provided on the lower cover plate. There is a certain distance between the upper cover plate and the lower cover plate, and the setting of the upper air vent and the lower air vent facilitates the upward escape of carbon dioxide gas.

[0007] As a further solution of the present invention: the anti-diffusion fire extinguishing pipes are correspondingly arranged on both sides of each of the cable joint protective shells, the two anti-diffusion fire extinguishing pipes are symmetrical about the cable joint protective shell, the anti-diffusion fire extinguishing pipes are arc-shaped pipe structures, and a plurality of the anti-diffusion upper nozzles are evenly distributed on the anti-diffusion fire extinguishing pipes.

[0008] As a further solution of the present invention: the cable connector protective shell is filled with inert gas, and multiple groups of monitoring cameras, rotating nozzles and monitoring boxes are arranged between two adjacent cable connector protective shells. The monitoring box is equipped with a temperature sensor and a smoke detector for fire early warning monitoring in the main body of the cable tunnel.

[0009] As a further solution of the present invention: a fire extinguishing agent storage tank and a power gas tank are arranged in the upper fire extinguishing device, the fire extinguishing agent storage tank and the power gas tank are connected by a pipeline, a control valve is installed on the pipeline, the fire extinguishing agent storage tank is connected to the upper fire extinguishing supply pipe, and is used to supply fire extinguishing agent to the upper fire extinguishing supply pipe.

[0010] As a further solution of the present invention: a carbon dioxide storage tank and a carbon dioxide generator are provided in the lower fire extinguishing device, the carbon dioxide storage tank is connected to the lower fire extinguishing supply pipe through a gas cylinder supply pipe, and the carbon dioxide generator is connected to the lower fire extinguishing supply pipe through a generator supply pipe, and gas supply control valves are correspondingly provided on the gas cylinder supply pipe and the generator supply pipe for controlling the supply of carbon dioxide.

[0011] As a further solution of the present invention: the fire extinguishing system is equipped with a main control console, a display screen is provided on the main control console, an audible and visual alarm is provided on the side of the display screen, and a signal transceiver and a microcontroller chip are provided in the main control console for controlling the working process of the fire extinguishing system to prevent the spread of fire.

[0012] As a further solution of the present invention: the inner support ring is an open ring structure at the bottom, the cross-section of the inner support ring is a T-shaped structure, a plurality of mounting holes are arranged on the middle rib plate of the inner support ring, a pipe fixing buckle is fixedly arranged at the upper position of the inner support ring, the upper fire extinguishing supply pipe is installed in the pipe fixing buckle, and a plurality of cable threading holes are arranged on the cable fixing seat for effectively fixing the cable.

[0013] After adopting the above technical scheme, the present invention has the following beneficial effects compared with the prior art.

[0014] The present invention is provided with an upper fire extinguishing supply pipe at the upper position of the cable tunnel body, and a lower fire extinguishing supply pipe is provided at the lower position. The upper fire extinguishing supply pipe is provided with an anti-diffusion fire extinguishing pipe and a rotating nozzle. The rotating nozzle is mainly used for extinguishing fire at a local position of the cable. The anti-diffusion fire extinguishing pipe can form a protective curtain structure in the cable tunnel body. A protective section is formed between the two curtains, so as to realize fire extinguishing protection for a section of the cable tunnel and effectively block the spread of fire. At the same time, the lower fire extinguishing supply pipe can spray carbon dioxide to reduce the oxygen content in the air. The upper and lower parts cooperate to further improve the fire extinguishing effect and prevent the spread of fire.

[0015] The present invention provides a cable joint protective shell at the cable joint, and the cable joint protective shell is filled with inert gas to provide fire protection for the cable joint. At the same time, a rotating nozzle, a monitoring box and a monitoring camera are provided on the side wall of the cable tunnel at the cable joint to focus on protecting, monitoring and extinguishing the cable joint position. At the same time, a rotating nozzle, a monitoring box and a monitoring camera are also provided in the middle section between two adjacent cable joints to monitor and protect the entire cable tunnel, thereby improving the safety of the overall fire protection in the cable tunnel.

[0016] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are part of this application and are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings: Figure 1 It is a schematic diagram of the connection state of the present invention; Figure 2 It is a schematic diagram of the interior of the cable tunnel of the present invention; Figure 3 It is a schematic diagram of the end face of the cable tunnel of the present invention; Figure 4 It is a schematic diagram of the interior side of the cable tunnel of the present invention; Figure 5 It is a schematic diagram of the interior of the upper fire extinguishing device of the present invention; Figure 6 It is a schematic diagram of the interior of the lower fire extinguishing device of the present invention; Figure 7 It is a block diagram of the connection of some components of the present invention; Figure 8 It is a schematic diagram of the supporting base plate of the present invention.

[0018] In the figure: 1. Cable tunnel body; 2. Upper fire extinguishing device; 3. Lower fire extinguishing device; 4. Main control console; 5. Display screen; 6. Sound and light alarm; 7. Upper fire extinguishing supply pipe; 8. Lower fire extinguishing supply pipe; 9. Fire extinguishing supply control valve; 10. Inner support ring; 11. Cable support frame; 12. Cable fixing seat; 13. Cable joint protective shell; 14. Anti-diffusion fire extinguishing pipe; 15. Anti-diffusion upper nozzle; 16. Lower fire extinguishing protection compartment; 17. Lower fire extinguishing branch pipe; 18. Lower fire extinguishing nozzle; 19 , cover plate mounting groove; 20, upper cover plate; 21, lower cover plate; 22, pipe fixing buckle; 23, monitoring camera; 24, rotating nozzle; 25, nozzle control valve; 26, monitoring box; 27, temperature sensor; 28, smoke detector; 29, fire extinguishing agent storage tank; 30, power gas cylinder; 31, carbon dioxide storage tank; 32, carbon dioxide generator; 33, gas cylinder supply pipe; 34, generator supply pipe; 35, gas supply control valve; 36, lower vent; 37, upper vent.

[0019] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0021] like Figures 1 to 8As shown, a fire extinguishing system for preventing the spread of fire includes an upper fire extinguishing device 2 and a lower fire extinguishing device 3. An upper fire extinguishing supply pipe 7 is arranged at one end of the upper fire extinguishing device 2. The upper fire extinguishing supply pipe 7 supplies to the cable tunnel body 1. An inner support ring 10 is fixedly arranged on the inner wall of the cable tunnel body 1. The upper fire extinguishing supply pipe 7 is arranged at the top position of the inner support ring 10. A cable support frame 11 is fixedly arranged on the side of the inner support ring 10. A cable fixing seat 12 is arranged on the cable support frame 11. A cable is passed through the cable fixing seat 12. A cable joint protective shell 13 is arranged at the joint position of the cable. A monitoring box 26 is fixedly arranged on the side wall of the cable tunnel body 1 on the side of the cable joint protective shell 13. The upper fire extinguishing supply pipe 7 and the cable joint are fixedly provided. A branch pipe is extended to the side at the corresponding position of the protective shell 13, and a nozzle control valve 25 is installed on the branch pipe. A rotating nozzle 24 is installed at the end position of the branch pipe. A monitoring camera 23 is installed near the top of the cable tunnel main body 1. An anti-diffusion fire extinguishing pipe 14 is extended downward from the upper fire extinguishing supply pipe 7, and an anti-diffusion upper nozzle 15 is arranged on the anti-diffusion fire extinguishing pipe 14. A lower fire extinguishing protection compartment 16 is arranged in the middle position of the bottom of the cable tunnel main body 1, and a lower fire extinguishing supply pipe 8 is arranged at one end of the lower fire extinguishing device 3. The lower fire extinguishing supply pipe 8 extends into the lower fire extinguishing protection compartment 16, and a lower fire extinguishing branch pipe 17 is arranged in the section of the lower fire extinguishing supply pipe 8 located in the lower fire extinguishing protection compartment 16, and a lower fire extinguishing nozzle 18 is installed on the lower fire extinguishing branch pipe 17.

[0022] Among them, multiple groups of lower fire extinguishing branch pipes 17 are arranged on the lower fire extinguishing supply pipe 8, and the lower fire extinguishing branch pipes 17 are arranged at equal intervals. Multiple lower fire extinguishing nozzles 18 are arranged on the lower fire extinguishing branch pipes 17. The bottom of the lower fire extinguishing protection chamber 16 is an arc structure, and a fixing buckle is provided in the lower fire extinguishing protection chamber 16 for fixing the position of the lower fire extinguishing branch pipes 17.

[0023] A cover plate mounting groove 19 is provided at the upper end of the lower fire extinguishing protection chamber 16, and the cover plate mounting groove 19 is a stepped groove structure. A lower cover plate 21 is provided at the lower part of the cover plate mounting groove 19, and an upper cover plate 20 is provided above the lower cover plate 21. The width dimension of the lower cover plate 21 is smaller than the width dimension of the upper cover plate 20. An upper air vent 37 is provided on the upper cover plate 20, and a lower air vent 36 is provided on the lower cover plate 21. There is a certain distance between the upper cover plate 20 and the lower cover plate 21. The setting of the upper air vent 37 and the lower air vent 36 facilitates the upward escape of carbon dioxide gas.

[0024] Each cable joint protective shell 13 is provided with an anti-diffusion fire extinguishing pipe 14 on both sides. The two anti-diffusion fire extinguishing pipes 14 are symmetrical about the cable joint protective shell 13. The anti-diffusion fire extinguishing pipes 14 are arc-shaped pipe structures, and multiple anti-diffusion upper nozzles 15 are evenly distributed on the anti-diffusion fire extinguishing pipes 14.

[0025] The cable joint protective shell 13 is filled with inert gas, and multiple groups of monitoring cameras 23, rotating nozzles 24 and monitoring boxes 26 are arranged between two adjacent cable joint protective shells 13. The monitoring box 26 is installed with a temperature sensor 27 and a smoke detector 28 for fire early warning monitoring in the cable tunnel body 1.

[0026] The upper fire extinguishing device 2 is provided with a fire extinguishing agent storage tank 29 and a power gas tank. The fire extinguishing agent storage tank 29 and the power gas tank are connected by a pipeline, and a control valve is installed on the pipeline. The fire extinguishing agent storage tank 29 is connected to the upper fire extinguishing supply pipe 7 for supplying fire extinguishing agent to the upper fire extinguishing supply pipe 7.

[0027] A carbon dioxide storage tank 31 and a carbon dioxide generator 32 are provided in the lower fire extinguishing device 3. The carbon dioxide storage tank 31 is connected to the lower fire extinguishing supply pipe 8 through a gas cylinder supply pipe 33. The carbon dioxide generator 32 is connected to the lower fire extinguishing supply pipe 8 through a generator supply pipe 34. Gas supply control valves 35 are correspondingly provided on the gas cylinder supply pipe 33 and the generator supply pipe 34 for controlling the supply of carbon dioxide.

[0028] The fire extinguishing system is equipped with a main control console 4, a display screen 5 is provided on the main control console 4, and a sound and light alarm 6 is provided on the side of the display screen 5. A signal transceiver and a microcontroller chip are provided in the main control console 4 for controlling the working process of the fire spreading prevention fire extinguishing system.

[0029] The inner support ring 10 is an open ring structure at the bottom, and the cross-section of the inner support ring 10 is a T-shaped structure. A plurality of mounting holes are arranged on the middle rib plate of the inner support ring 10. A pipe fixing buckle 22 is fixedly arranged at the upper position of the inner support ring 10, and the upper fire extinguishing supply pipe 7 is installed in the pipe fixing buckle 22. A plurality of cable threading holes are arranged on the cable fixing seat 12 for effectively fixing the cables.

[0030] The working principle of the present invention is: Embodiment 1: A cable joint protective shell 13 is set at the cable joint position, and the cable joint protective shell 13 is filled with inert gas, which can provide basic protection against fire caused by cable joint failure and reduce the probability of combustion; secondly, a monitoring camera 23 and a monitoring box 26 are set around the cable joint protective shell 13, and the monitoring box 26 can monitor the surrounding temperature. At the same time, the smoke detector 28 can perform smoke monitoring. The model of the temperature sensor 27 is preferably DS18B20, and the model of the smoke detector 28 is preferably NP-Y3-WF. By monitoring the surrounding of the cable joint protective shell 13, early warning and protection of fire can be performed; at the same time, in the length direction of the cable tunnel body 1, between two adjacent cable joint protective shells 13, a plurality of monitoring cameras 23 and monitoring boxes 26 are also provided for fire safety monitoring; Embodiment 2: When an unexpected situation occurs and a cable catches fire, the monitoring box 26 and the surveillance camera 23 close to the fire location can quickly lock the fire location and feed back the location information to the main control console 4. The main control console 4 controls the upper fire extinguishing device 2 and the lower fire extinguishing device 3 to work simultaneously. The upper fire extinguishing device 2 supplies fire extinguishing agent to the upper fire extinguishing supply pipe 7. The corresponding nozzle control valves 25 on the several rotating nozzles 24 close to the fire source are opened to spray fire extinguishing agent to the fire source to extinguish the fire. At the same time, the corresponding valves on the two groups of anti-diffusion fire extinguishing pipes 14 close to the fire source are opened to spray fire extinguishing agent downward. Since the anti-diffusion fire extinguishing pipes 14 are arc-shaped, the fire extinguishing agent is ejected downward. The structure is set up. During the process of spraying the fire extinguishing agent downward, a protective curtain structure can be formed to form a section protection inside the cable tunnel, thereby reducing the probability of fire spreading. While the anti-diffusion fire extinguishing pipe 14 is working, the lower fire extinguishing device 3 supplies carbon dioxide gas to the lower fire extinguishing supply pipe 8. The carbon dioxide gas is sprayed through the lower fire extinguishing branch pipe 17 and the lower fire extinguishing nozzle 18, and then passes through the lower vent hole 36 on the lower cover plate 21 and the upper vent hole 37 on the upper cover plate 20, and then discharged upward. The section where the carbon dioxide is sprayed from the lower fire extinguishing branch pipe 17 is consistent with the section protected by the fire extinguishing agent protective curtain structure, thereby reducing the oxygen content in the air and further suppressing the spread of the fire. Embodiment 3: Based on the above embodiment, the upper fire extinguishing device 2 preferably uses liquid fire extinguishing agent, and the curtain barrier effect is relatively better. The structures of the upper fire extinguishing device 2 and the lower fire extinguishing device 3 are not limited to the above description, and any structure that can provide fire extinguishing agent to the upper fire extinguishing supply pipe 7 and the lower fire extinguishing supply pipe 8 is acceptable; The present invention is provided with an upper fire extinguishing supply pipe 7 at the upper position of the cable tunnel body 1, and a lower fire extinguishing supply pipe 8 at the lower position. The upper fire extinguishing supply pipe 7 is provided with an anti-diffusion fire extinguishing pipe 14 and a rotating nozzle 24. The rotating nozzle 24 is mainly used to extinguish the fire at a local position of the cable. The anti-diffusion fire extinguishing pipe 14 can form a protective curtain structure in the cable tunnel body 1, and a protective section is formed between the two curtains, so as to realize fire extinguishing protection for a section of the cable tunnel and effectively prevent the spread of fire. At the same time, the lower fire extinguishing supply pipe 8 can spray carbon dioxide to reduce the oxygen content in the air, and the upper and lower cooperation further improves the fire extinguishing effect. The invention provides a cable joint protective shell 13 at the cable joint, and the cable joint protective shell 13 is filled with inert gas to provide fire protection for the cable joint. At the same time, a rotating nozzle 24, a monitoring box 26 and a monitoring camera 23 are provided on the side wall of the cable tunnel at the cable joint to focus on protecting, monitoring and extinguishing the cable joint position. At the same time, a rotating nozzle 24, a monitoring box 26 and a monitoring camera 23 are also provided in the middle section between two adjacent cable joints to monitor and protect the entire cable tunnel, thereby improving the safety of the overall fire protection in the cable tunnel.

[0031] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modify the technical contents suggested above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the solution of the present invention.

Claims

1. A fire extinguishing system for preventing the spread of fire, comprising an upper fire extinguishing device (2) and a lower fire extinguishing device (3), characterized in that: An upper fire extinguishing supply pipe (7) is provided at one end of the upper fire extinguishing device (2), and the upper fire extinguishing supply pipe (7) supplies to the cable tunnel body (1). An inner support ring (10) is fixedly provided on the inner wall of the cable tunnel body (1), and the upper fire extinguishing supply pipe (7) is arranged at the top position of the inner support ring (10). A cable support frame (11) is fixedly provided on the side of the inner support ring (10), and a cable fixing seat (12) is provided on the cable support frame (11). A cable is passed through the cable fixing seat (12), and a cable joint protective shell (13) is provided at the joint position of the cable. A monitoring box (26) is fixedly provided on the side wall of the cable tunnel body (1) on the side of the cable joint protective shell (13). The upper fire extinguishing supply pipe (7) is extended laterally at a position corresponding to the cable joint protective shell (13). A branch pipe is provided extending from the cable tunnel body (1), a nozzle control valve (25) is installed on the branch pipe, a rotating nozzle (24) is installed at the end of the branch pipe, a monitoring camera (23) is installed near the top of the cable tunnel body (1), an anti-diffusion fire extinguishing pipe (14) is provided downwardly extending from the upper fire extinguishing supply pipe (7), an anti-diffusion upper nozzle (15) is provided on the anti-diffusion fire extinguishing pipe (14), a lower fire extinguishing protection compartment (16) is provided at the middle position of the bottom of the cable tunnel body (1), a lower fire extinguishing supply pipe (8) is provided at one end of the lower fire extinguishing device (3), the lower fire extinguishing supply pipe (8) extends into the lower fire extinguishing protection compartment (16), a lower fire extinguishing branch pipe (17) is provided in the section of the lower fire extinguishing supply pipe (8) located in the lower fire extinguishing protection compartment (16), and a lower fire extinguishing nozzle (18) is installed on the lower fire extinguishing branch pipe (17).

2. A fire extinguishing system for preventing the spread of fire according to claim 1, characterized in that: The lower fire extinguishing supply pipe (8) is provided with a plurality of groups of lower fire extinguishing branch pipes (17), the lower fire extinguishing branch pipes (17) are arranged at equal intervals, the lower fire extinguishing branch pipes (17) are provided with a plurality of lower fire extinguishing nozzles (18), the bottom of the lower fire extinguishing protection chamber (16) is a curved surface structure, and a fixing buckle is provided in the lower fire extinguishing protection chamber (16).

3. A fire extinguishing system for preventing the spread of fire according to claim 2, characterized in that: A cover plate mounting groove (19) is provided at the upper end of the lower fire protection chamber (16); the cover plate mounting groove (19) is a stepped groove structure; a lower cover plate (21) is provided at the lower portion of the cover plate mounting groove (19); an upper cover plate (20) is provided above the lower cover plate (21); the width of the lower cover plate (21) is smaller than the width of the upper cover plate (20); an upper vent hole (37) is provided on the upper cover plate (20); a lower vent hole (36) is provided on the lower cover plate (21); and a certain distance exists between the upper cover plate (20) and the lower cover plate (21).

4. A fire extinguishing system for preventing the spread of fire according to claim 3, characterized in that: The anti-diffusion fire extinguishing pipe (14) is correspondingly arranged on both sides of each of the cable joint protective shells (13); the two anti-diffusion fire extinguishing pipes (14) are symmetrical about the cable joint protective shell (13); the anti-diffusion fire extinguishing pipe (14) is an arc-shaped pipe structure; and a plurality of the anti-diffusion upper nozzles (15) are evenly arranged on the anti-diffusion fire extinguishing pipe (14).

5. A fire extinguishing system for preventing the spread of fire according to claim 4, characterized in that: The cable joint protective shell (13) is filled with an inert gas, and a plurality of groups of monitoring cameras (23), rotating nozzles (24) and monitoring boxes (26) are arranged between two adjacent cable joint protective shells (13), and a temperature sensor (27) and a smoke detector (28) are installed on the monitoring box (26).

6. A fire extinguishing system for preventing the spread of fire according to claim 5, characterized in that: The upper fire extinguishing device (2) is provided with a fire extinguishing agent storage tank (29) and a power gas tank. The fire extinguishing agent storage tank (29) and the power gas tank are connected via a pipeline, a control valve is installed on the pipeline, and the fire extinguishing agent storage tank (29) is connected to the upper fire extinguishing supply pipe (7).

7. A fire extinguishing system for preventing the spread of fire according to claim 6, characterized in that: The lower fire extinguishing device (3) is provided with a carbon dioxide storage tank (31) and a carbon dioxide generator (32); the carbon dioxide storage tank (31) is connected to the lower fire extinguishing supply pipe (8) via a gas cylinder supply pipe (33); the carbon dioxide generator (32) is connected to the lower fire extinguishing supply pipe (8) via a generator supply pipe (34); and gas supply control valves (35) are correspondingly provided on the gas cylinder supply pipe (33) and the generator supply pipe (34).

8. A fire extinguishing system for preventing the spread of fire according to claim 7, characterized in that: The fire extinguishing system is equipped with a main control console (4), a display screen (5) is arranged on the main control console (4), an audible and visual alarm (6) is arranged on the side of the display screen (5), and a signal transceiver and a microcontroller chip are arranged inside the main control console (4).

9. A fire extinguishing system for preventing the spread of fire according to claim 8, characterized in that: The inner support ring (10) is a ring-shaped structure with an open lower portion, the cross section of the inner support ring (10) is a T-shaped structure, a plurality of mounting holes are arranged on the middle rib plate of the inner support ring (10), a pipe fixing buckle (22) is fixedly arranged at the upper position of the inner support ring (10), the upper fire extinguishing supply pipe (7) is installed in the pipe fixing buckle (22), and a plurality of cable insertion holes are arranged on the cable fixing seat (12).

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