A low-voltage distribution cabinet with fireproof structure

Abstract

This invention relates to the field of low-voltage distribution cabinet technology, specifically a low-voltage distribution cabinet with a fireproof structure. It includes a cabinet body, several mounting bases, a fire extinguishing agent supply mechanism, and a fire extinguishing agent spraying mechanism. The mounting bases are vertically spaced within the cabinet body. The fire extinguishing agent supply mechanism is located at the top inner part of the cabinet body. Each fire extinguishing agent spraying mechanism corresponds to one of the mounting bases, and each spraying mechanism is mounted on its corresponding mounting base. This invention provides multiple independently movable mounting bases within the cabinet body. When a fire occurs in a row of electrical components, the mounting base supporting that row is moved outside the cabinet body, and then fire extinguishing agent is sprayed onto that row of components, achieving targeted extinguishing of the fire. During this process, the electrical components in other rows inside the cabinet remain in a closed and protected state, effectively avoiding secondary damage caused by the spread of fire extinguishing agent, and significantly improving the safety and recoverability of low-voltage distribution cabinet fire response.

Description

Technical Field

[0001] This invention relates to the field of low-voltage distribution cabinet technology, specifically a low-voltage distribution cabinet with a fireproof structure. Background Technology

[0002] Low-voltage switchgear typically employs a modular and hierarchical layout design, with multiple rows of electrical components arranged from top to bottom. Each row of electrical components is functionally zoned, operating independently yet working closely together to form a complete power distribution and control system.

[0003] In power systems, low-voltage switchgear, as a key device for power distribution and control, is prone to fires due to its dense internal electrical components caused by aging wiring, short circuits, and overloads during prolonged operation. Therefore, effective fire prevention and extinguishing design for low-voltage switchgear is crucial. To address the fire hazards inside switchgear, fire-extinguishing switchgear with built-in fire extinguishers has emerged on the market. While these switchgear can extinguish fires by releasing extinguishing agents, they have significant drawbacks. Specifically, when releasing extinguishing agents, existing fire-extinguishing switchgear sprays the agents non-directionally into the switchgear, making it difficult to directly cover the fire source. This non-directional extinguishing method results in inaccurate fire suppression, with large amounts of extinguishing agent potentially spraying into areas without fire sources. This not only wastes resources but also risks allowing the fire to spread beyond the initial extinguishing window, leading to greater economic losses and safety hazards.

[0004] Meanwhile, while this indiscriminate fire suppression method can extinguish open flames, it inevitably exposes electrical components in unburned areas to corrosion from the extinguishing agent, causing damage to a large number of non-faulty devices and significantly increasing maintenance costs. Therefore, we propose a low-voltage distribution cabinet with a fire-resistant structure to effectively address these drawbacks. Summary of the Invention

[0005] The purpose of this invention is to provide a low-voltage distribution cabinet with a fireproof structure to solve the problem mentioned in the background art of non-directional fire extinguishing, which makes it difficult to directly cover the fire source.

[0006] This invention is achieved through the following technical solution: a low-voltage distribution cabinet with a fireproof structure, comprising:

[0007] The cabinet has a main controller fixed to its side wall.

[0008] Several mounting bases are vertically spaced within the cabinet, and each mounting base can slide laterally. The cabinet has an entrance / exit corresponding to each mounting base on its side wall.

[0009] A fire extinguishing agent supply mechanism is located at the top inside the cabinet.

[0010] Several fire extinguishing agent spraying mechanisms are provided, and each fire extinguishing agent spraying mechanism corresponds to a mounting base. Each fire extinguishing agent spraying mechanism is installed on its corresponding mounting base.

[0011] The fire extinguishing agent spraying mechanism includes a spraying pipe rotatably connected to the mounting base, and the spraying pipe is connected to the fire extinguishing agent supply mechanism through a pipeline;

[0012] The spray pipe includes a horizontal pipe arranged in a horizontal direction, with side pipes connected to both ends of the horizontal pipe. Each side pipe and the horizontal pipe cooperate to form a U-shaped structure. The two side pipes are respectively rotatably engaged with the left and right side walls of the mounting base. Several spraying components are connected to the horizontal pipe.

[0013] The spraying assembly includes a spray pipe that communicates with the horizontal pipe. The spray pipe is movably connected to the horizontal pipe and is located between two side pipes. When the spray pipe rotates from a vertical position to a horizontal position, the spray pipe can move toward the side away from the horizontal pipe.

[0014] Optionally, the cabinet is equipped with linear modules that correspond one-to-one with each mounting base. The actuator of each linear module is fixed to the corresponding mounting base, which is used to move the mounting base laterally.

[0015] Optionally, the extinguishing agent supply mechanism includes a pressurized storage tank fixed to the top of the cabinet, wherein dry powder extinguishing agent is compressed and stored in the pressurized storage tank; the outlet of the pressurized storage tank is connected to a main pipe, and a branch pipe corresponding to each spray pipe is connected to the main pipe, and each branch pipe is connected to the corresponding spray pipe through a pipeline; a solenoid valve is installed on each branch pipe, and each solenoid valve is communicatively connected to the main controller.

[0016] Optionally, a servo motor is fixed to one side of the mounting base, and the output end of the servo motor is connected to the adjacent side tube.

[0017] A rotary joint coaxial with the output shaft of the servo motor is fixed on the other side of the mounting base. The movable end of the rotary joint is connected to the adjacent side tube, and the fixed end of the rotary joint is connected to a bellows, which is connected to the fire extinguishing agent supply mechanism.

[0018] Optionally, two T-shaped baffles are movably inserted near the end of the spray pipe, and a connecting rope located at the end of the spray pipe is connected between the two T-shaped baffles.

[0019] Connecting blocks are fixed on both sides of the injection pipe between two T-shaped baffles, and connecting springs are connected between each connecting block and each T-shaped baffle.

[0020] Under normal conditions, the connecting rope is taut and the connecting springs are compressed.

[0021] Optionally, a fixed tube corresponding to each spray tube is fixed on the horizontal tube, and each spray tube is movably sleeved on the corresponding fixed tube.

[0022] Sliding sleeves are movably fitted on each side pipe, and a synchronizing rod is fixed between two sliding sleeves. Each injection pipe is fixed to the synchronizing rod.

[0023] Optionally, the two ends of the synchronizing rod are rotatably connected to rotating sleeves, and an arc-shaped plate corresponding to each rotating sleeve is fixed on the side wall of the mounting base.

[0024] A fixing ring is fixed on each side tube, and several return springs are connected between each fixing ring and the corresponding sliding sleeve. Under normal conditions, each return spring is in a naturally extended state. When the rotating sleeve contacts the arc plate, each return spring is in a compressed state.

[0025] Optionally, a partition is fixed inside the cabinet between two adjacent mounting seats. The partitions cooperate to divide the cabinet into electrical cavities corresponding to each mounting seat. A fire detector is fixed in each electrical cavity, and each fire detector is communicatively connected to the main controller.

[0026] Optionally, the mounting base has a plurality of electrical components arranged laterally, and the electrical components on two adjacent mounting bases are connected by wires.

[0027] Optionally, the partition is hollow inside, and the wiring between two adjacent rows of electrical components passes through the partition. A cutting mechanism for cutting the wiring is provided inside the partition.

[0028] Compared with the prior art, the present invention provides a low-voltage distribution cabinet with a fireproof structure, which has the following advantages:

[0029] 1. This invention features multiple independently movable mounting bases within the cabinet. When a fire occurs in a row of electrical components, the mounting base supporting that row is moved outside the cabinet, and then fire extinguishing agent is sprayed onto that row of components, achieving targeted extinguishing of the fire. During this process, the electrical components in other rows inside the cabinet remain in a closed and protected state, effectively preventing secondary damage caused by the spread of fire extinguishing agent, and significantly improving the safety and equipment recoverability in handling low-voltage distribution cabinet fires.

[0030] 2. The present invention provides spraying components on the spraying pipe that correspond one-to-one with each electrical component. When the spraying pipe rotates back and forth around a row of electrical components, the spraying component corresponding to the ignition point is activated, while the other spraying components are in the closed state. This allows the extinguishing agent to be accurately sprayed to the fire source, achieving targeted and concentrated fire extinguishing at the ignition point. This not only improves the fire extinguishing efficiency but also minimizes the impact on surrounding normal electrical components.

[0031] 3. The spray pipe in this invention can move along the axial direction of the fixed pipe, so that the spray pipe and the electrical components are always kept within a reasonable distance range, avoiding the risk that the ignition point cannot be triggered to open the spray assembly due to excessive distance, thereby providing a stable guarantee for the reliable start-up of the spray assembly and accurate fire extinguishing when a fire occurs. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the interior of the cabinet of the present invention;

[0033] Figure 2 This is a schematic diagram showing the mounting base of the present invention moved outside the cabinet.

[0034] Figure 3 This is a schematic diagram of the mounting base of the present invention;

[0035] Figure 4 This is a schematic diagram of the sliding sleeve of the present invention;

[0036] Figure 5 This is a schematic diagram of the injection tube of the present invention;

[0037] Figure 6 This is a diagram showing the state when the rotating sleeve of the present invention is not in contact with the arc-shaped plate;

[0038] Figure 7 This is a diagram showing the state when the rotating sleeve of the present invention is in contact with the arc-shaped plate.

[0039] In the diagram: 1. Cabinet; 2. Mounting base; 3. Electrical components; 4. Partition; 5. Extinguishing agent supply mechanism; 501. Pressurized storage tank; 502. Main pipe; 6. Return spring; 7. Extinguishing agent spraying mechanism; 701. Spraying pipe; 7011. Horizontal pipe; 7012. Side pipe; 702. Spray assembly; 7021. Spray pipe; 7022. T-shaped baffle; 7023. Connecting rope; 7024. Connecting block; 7025. Connecting spring; 8. Linear module; 9. Servo motor; 10. Rotary joint; 11. Fixing ring; 12. Electrical cavity; 13. Fixing pipe; 14. Sliding sleeve; 15. Synchronizing rod; 16. Rotating sleeve; 17. Arc plate. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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 skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] Please see Figures 1 to 7This application provides a low-voltage distribution cabinet with a fireproof structure, including a cabinet body 1, several mounting bases 2, a fire extinguishing agent supply mechanism 5, and several fire extinguishing agent spraying mechanisms 7. A main controller (not shown in the figure) is fixed on the side wall of the cabinet body 1 for controlling other components. Several mounting bases 2 are vertically spaced within the cabinet body 1, and are used to install electrical equipment. Each mounting base 2 can slide laterally. The side wall of the cabinet body 1 has an inlet / outlet corresponding to each mounting base 2, allowing the mounting base 2 to move to the outside of the cabinet body 1. The fire extinguishing agent supply mechanism 5 is located at the top inner part of the cabinet body 1 and is used to supply dry powder fire extinguishing agent. Several fire extinguishing agent spraying mechanisms 7 correspond one-to-one with each mounting base 2, and are mounted on their respective mounting bases 2 for spraying fire extinguishing agent onto the mounting base 2. The fire extinguishing agent spraying mechanism 7 includes a spraying pipe 701 rotatably connected to the mounting base 2. The spraying pipe 701 is connected to the fire extinguishing agent supply mechanism 5 through a pipeline to ensure the normal delivery of the fire extinguishing agent.

[0042] In this embodiment, a linear module 8 corresponding to each mounting base 2 is installed inside the cabinet 1 (each linear module 8 is communicatively connected to the main controller). The execution end of each linear module 8 is fixed to the corresponding mounting base 2 to make the mounting base 2 move laterally. Specifically, the mounting base 2 has a U-shaped structure, and the movable end of the linear module 8 is fixedly connected to the back plate of the corresponding mounting base 2.

[0043] The following is an introduction to fire extinguishing agent supply organization 5:

[0044] The extinguishing agent supply mechanism 5 includes a pressurized storage tank 501 fixed to the top of the cabinet 1. The pressurized storage tank 501 stores compressed dry powder extinguishing agent and is pre-charged with inert driving gases such as nitrogen. The outlet of the pressurized storage tank 501 is connected to a main pipe 502, and branch pipes corresponding to each spray pipe 701 are connected to the main pipe 502. Each branch pipe is connected to the corresponding spray pipe 701 through a pipeline. A solenoid valve (not shown in the figure) is installed on each branch pipe. Each solenoid valve is communicatively connected to the main controller, which controls the opening and closing of each solenoid valve.

[0045] The following is an introduction to the spray pipe 701:

[0046] The spray pipe 701 includes a horizontal pipe 7011 arranged in a horizontal direction. Side pipes 7012 are connected to both ends of the horizontal pipe 7011. Each side pipe 7012 cooperates with the horizontal pipe 7011 to form a U-shaped structure. The two side pipes 7012 are rotatably engaged with the left and right side walls of the mounting base 2, respectively. Several spraying components 702 are connected to the horizontal pipe 7011 for spraying the extinguishing agent.

[0047] To enable the U-shaped structure to rotate back and forth, a servo motor 9 is fixed to one side of the mounting base 2. The servo motor 9 is communicatively connected to the main controller, and its output end is connected to the adjacent side tube 7012. A rotary joint 10, coaxial with the servo motor 9, is fixed to the other side of the mounting base 2. The movable end of the rotary joint 10 is conductively connected to the adjacent side tube 7012, and the fixed end of the rotary joint 10 is conductively connected to a bellows, which is conductively connected to the fire extinguishing agent supply mechanism 5. In this embodiment, the bellows is conductively connected to the diversion pipe.

[0048] When the servo motor 9 is working, it drives the U-shaped structure to rotate back and forth, thereby spraying the extinguishing agent through the spray assembly 702. During this process, the horizontal pipe 7011 is connected to the diversion pipe through the cooperation of the side pipe 7012, the rotary joint 10 and the bellows, ensuring the normal delivery of the extinguishing agent.

[0049] In some embodiments of this application, the following design is implemented to ensure that the extinguishing agent can be accurately sprayed to the ignition point:

[0050] The injection assembly 702 includes an injection pipe 7021 that communicates with the horizontal pipe 7011. Two T-shaped baffles 7022 are movably inserted near the end of the injection pipe 7021. The two T-shaped baffles 7022 cooperate to seal the port of the injection pipe 7021. A connecting rope 7023 located at the end of the injection pipe 7021 is connected between the two T-shaped baffles 7022. The connecting rope 7023 is made of a special flame-retardant material and a melting point sensitizer, possessing extremely strong temperature-selective response characteristics. In daily operation, the connecting rope 7023 can withstand continuous high temperatures of 180°C while maintaining structural integrity; at the same time, its mechanical strength has been specially treated to withstand a continuous tensile force of over 80N, ensuring that the double T-shaped baffles 7022 are tightly fitted under normal conditions, maintaining the closed state of the port of the injection pipe 7021.

[0051] Connecting blocks 7024 are fixed on both sides of the injection pipe 7021, located between two T-shaped baffles 7022. Connecting springs 7025 are connected between each connecting block 7024 and each T-shaped baffle 7022. Under normal conditions, the connecting rope 7023 is taut, and each connecting spring 7025 is compressed, so that the two T-shaped baffles 7022 fit together to seal the end of the injection pipe 7021.

[0052] With the above structure, when a fire breaks out on the component on mounting base 2, the heat radiation and high temperature of the flame directly act on the connecting rope 7023 of the corresponding spray pipe 7021. Because the connecting rope 7023 is particularly sensitive to the infrared radiation band in the flame, the melting point sensitizer inside the rope rapidly absorbs the flame energy at the moment of contact, causing the local temperature to rise sharply to over 320°C, far exceeding its designed melting temperature threshold, thus melting within one second. After the connecting rope 7023 breaks, the connecting spring 7025, which was originally in a compressed state, immediately releases its elastic potential energy, pushing the two T-shaped baffles 7022 to separate rapidly, instantly opening the port of the spray pipe 7021 and accurately spraying the extinguishing agent towards the ignition point.

[0053] For the other spray nozzles 7021 that were not directly exposed to flames, even in the presence of high temperatures caused by the fire, as long as the conditions for flame contact are not met, the connecting rope 7023 will not melt. The T-shaped baffles 7022 on both sides remain sealed under the tension of the connecting rope 7023, effectively preventing unnecessary leakage of the extinguishing agent. This design greatly improves the accuracy of fire suppression, not only concentrating the extinguishing agent on the ignition point, increasing fire suppression efficiency by more than 40%, but also minimizing contamination and damage to surrounding components, reducing the risk of secondary equipment failures caused by fire suppression, and significantly shortening post-disaster equipment maintenance and power restoration time.

[0054] In some other embodiments of this application, the spray pipe 7021 is movably connected to the horizontal pipe 7011, and the spray pipe 7021 is located between the two side pipes 7012. When the spray pipe 701 rotates from a vertical position (the horizontal pipe 7011 is located in the top or bottom area of ​​the mounting base 2) to a horizontal position (the horizontal pipe 7011 is located in the middle area of ​​the mounting base 2), the spray pipe 7021 can move towards the side away from the horizontal pipe 7011. That is, when the spray pipe 701 rotates around the electrical component 3 (each electrical component 3 is arranged in a long strip along the horizontal direction) to a horizontal position (the horizontal pipe 7011 is furthest away from the electrical component 3), the spray pipe 7021 can automatically extend away from the horizontal pipe 7011, dynamically shortening the distance with the electrical component 3, ensuring that the flame heat radiation intensity is sufficient to reliably melt the connecting rope 7023.

[0055] Specifically, a fixed tube 13 corresponding to each spray tube 7021 is fixed on the horizontal tube 7011. Each fixed tube 13 communicates with the horizontal tube 7011, and each spray tube 7021 is movably sleeved on its corresponding fixed tube 13. A sealing ring is provided at the junction of the spray tube 7021 and the fixed tube 13 to ensure no leakage of extinguishing agent. A sliding sleeve 14 is movably sleeved on each side tube 7012, and a synchronizing rod 15 is fixed between two sliding sleeves 14. Each spray tube 7021 is fixed to the synchronizing rod 15 to ensure that all spray tubes 7021 operate synchronously. Each sliding sleeve 14 can slide synchronously along the axial direction of the side tube 7012 to adjust the distance between the end of the spray tube 7021 and the components on the mounting base 2.

[0056] To enable the sliding sleeve 14 to slide axially along the side tube 7012, rotating sleeves 16 are rotatably connected to both ends of the synchronizing rod 15. Arc-shaped plates 17 corresponding to each rotating sleeve 16 are fixed on the side wall of the mounting base 2. A fixing ring 11 is fixed on each side tube 7012, and several return springs 6 are connected between each fixing ring 11 and the corresponding sliding sleeve 14. Under normal conditions, each return spring 6 is in a naturally extended state, and the injection pipe 7021 is in a retracted state.

[0057] With the above design, when the spray pipe 701 rotates to the middle area of ​​the mounting base 2, the rotating sleeve 16 contacts the arc plate 17. Guided by the contour of the arc plate 17, the synchronizing rod 15 translates axially along the side pipe 7012, causing the sliding sleeve 14 to compress the return spring 6. At this time, the spray pipe 7021 extends axially along the fixed pipe 13, shortening the distance between the end of the spray pipe 7021 and the surface of the mounting base 2 to 60% of the initial distance, ensuring that the flame heat radiation intensity is sufficient to reliably melt the connecting rope 7023.

[0058] As the spray pipe 701 continues to rotate away from the central area of ​​the mounting base 2, the rotating sleeve 16 disengages from the constraint of the arc-shaped plate 17, and the return spring 6 releases its elastic potential energy, pushing the sliding sleeve 14 to move in the opposite direction, causing the spray pipe 7021 to automatically return to its retracted state. This intelligent mechanical linkage design requires no additional power source and achieves dynamic optimization of the distance between the spray assembly 702 and the mounting base 2 through a purely mechanical structure. This ensures that throughout the entire rotating fire extinguishing process, the distance between the spray pipe 7021 and the fire source remains within the effective range for reliable triggering of the connecting rope 7023 (thermal radiation intensity ≥ 5kW / m²). 2 This significantly improves the response reliability and fire extinguishing efficiency for fires involving specially shaped electrical components.

[0059] It should be added that a partition 4 is fixed inside the cabinet 1 between two adjacent mounting seats 2. The partition 4 cooperates to divide the cabinet 1 into electrical cavities 12 corresponding to each mounting seat 2. Each mounting seat 2 is movably set in the corresponding electrical cavity 12, so that each mounting seat 2 can be independent of each other. When the electrical component 3 on one mounting seat 2 catches fire, it is not easy to affect the electrical components 3 in other electrical cavities 12.

[0060] Fire detectors (not shown in the figure) are fixed in each electrical cavity 12, and each fire detector is communicatively connected to the main controller. In this embodiment, the fire detectors may be flame sensors, temperature sensors, or smoke sensors, etc., used to detect whether a fire has occurred in the electrical cavity 12 and send the signal to the main controller.

[0061] In addition, the mounting base 2 is equipped with several horizontally arranged electrical components 3, and adjacent rows of electrical components 3 are connected by wires. The partition 4 is hollow inside, and the wiring between adjacent rows of electrical components 3 passes through the partition 4. A cutting mechanism (communicating with the main controller) is installed inside the partition 4 to cut the wiring. The cutting mechanism mainly includes two cutters that can open and close, each cutter located on the front and rear sides of the wiring. When a fire occurs in a certain electrical cavity 12, the main controller triggers the cutting mechanism in the corresponding partition 4, driving the two cutters to close quickly and cut the wiring, thus preventing the wiring from remaining connected to the electrical components 3 and causing circuit failure during the process of moving the mounting base 2 outside the cabinet 1 for fire extinguishing.

[0062] Under normal conditions, the end of the mounting base 2 blocks the inlet and outlet, preventing dust and other debris from easily entering the cabinet 1. When a fire detector in an electrical cavity 12 detects a fire, it sends a signal to the main controller. The main controller then controls the linear module 8, causing the mounting base 2 in that electrical cavity 12 to move laterally outside the cabinet 1. The inner end of the mounting base 2 blocks the inlet and outlet, thus preventing the extinguishing agent from easily entering the cabinet 1 when it is sprayed, thereby minimizing its impact on other electrical components 3.

[0063] Meanwhile, the fire extinguishing agent supply mechanism 5 is located at the top inside the cabinet 1, and the servo motor 9 is located outside the cabinet 1 to avoid occupying the internal space of the cabinet 1.

[0064] With the above design, when a fire occurs in an electrical cavity 12, the fire detector inside the cavity quickly captures the fire signal and transmits it to the main controller. The main controller then controls the corresponding linear module 8 to start, driving the mounting base 2 to move laterally, exiting the cabinet 1 through the side wall inlet and outlet. At the same time, the inner end of the mounting base 2 blocks the inlet and outlet to prevent the extinguishing agent from spreading to other areas of the cabinet 1. Before the mounting base 2 moves, the main controller first operates the shearing mechanism inside the partition 4 to cut off the circuit.

[0065] After completing the above operations, the main controller sends an opening command to the solenoid valve on the corresponding branch pipe. The inert driving gas in the pressurized storage tank 501 expands to form a pressure difference, driving the dry powder extinguishing agent to be transported along the main pipe 502 and the branch pipe to the corresponding spray pipe 701. At the same time, the servo motor 9 drives the U-shaped spray pipe 701 to rotate back and forth around the electrical component 3. The spray components 702 on it, corresponding to each electrical component 3, accurately and evenly spray the extinguishing agent onto the outer surface of the burning component, achieving efficient targeted fire extinguishing. This also minimizes the impact on other electrical components 3 inside the cabinet 1, significantly improving the safety and equipment recoverability of low-voltage distribution cabinet fire handling.

[0066] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0067] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A low-voltage distribution cabinet with a fireproof structure, characterized in that, include: The cabinet has a main controller fixed to its side wall. Several mounting bases are vertically spaced within the cabinet, and each mounting base can slide laterally. The cabinet has an entrance / exit corresponding to each mounting base on its side wall. A fire extinguishing agent supply mechanism is located at the top inside the cabinet. Several fire extinguishing agent spraying mechanisms are provided, and each fire extinguishing agent spraying mechanism corresponds to a mounting base. Each fire extinguishing agent spraying mechanism is installed on its corresponding mounting base. The fire extinguishing agent spraying mechanism includes a spraying pipe rotatably connected to the mounting base, and the spraying pipe is connected to the fire extinguishing agent supply mechanism through a pipeline; The spray pipe includes a horizontal pipe arranged in a horizontal direction, with side pipes connected to both ends of the horizontal pipe. Each side pipe and the horizontal pipe cooperate to form a U-shaped structure. The two side pipes are respectively rotatably engaged with the left and right side walls of the mounting base. Several spraying components are connected to the horizontal pipe. The spraying assembly includes a spraying pipe that communicates with the horizontal pipe. The spraying pipe is movably connected to the horizontal pipe and is located between two side pipes. When the spraying pipe rotates from a vertical position to a horizontal position, the spraying pipe can move toward the side away from the horizontal pipe. The horizontal tube is fixed with a fixed tube corresponding to each spray tube, and each spray tube is movably sleeved on the corresponding fixed tube. Sliding sleeves are movably fitted on each side pipe, and a synchronizing rod is fixed between two sliding sleeves. Each injection pipe is fixed to the synchronizing rod. The two ends of the synchronizing rod are rotatably connected to rotating sleeves, and arc-shaped plates corresponding to each rotating sleeve are fixed on the side wall of the mounting base. A fixing ring is fixed on each side tube, and several return springs are connected between each fixing ring and the corresponding sliding sleeve. Under normal conditions, each return spring is in a naturally extended state. When the rotating sleeve contacts the arc plate, each return spring is in a compressed state.

2. A low-voltage distribution cabinet with a fireproof structure according to claim 1, characterized in that: The cabinet is equipped with linear modules that correspond one-to-one with each mounting base. The actuator of each linear module is fixed to the corresponding mounting base, which is used to move the mounting base laterally.

3. A low-voltage distribution cabinet with a fireproof structure according to claim 1, characterized in that: The extinguishing agent supply mechanism includes a pressurized storage tank fixed to the top of the cabinet, which stores compressed dry powder extinguishing agent. The outlet of the pressurized storage tank is connected to a main pipe, and branch pipes corresponding to each spray pipe are connected to the main pipe. Each branch pipe is connected to the corresponding spray pipe through a pipeline. A solenoid valve is installed on each branch pipe, and each solenoid valve is communicatively connected to the main controller.

4. A low-voltage distribution cabinet with a fireproof structure according to claim 1, characterized in that: A servo motor is fixed to one side of the mounting base, and the output end of the servo motor is connected to the adjacent side tube. A rotary joint coaxial with the output shaft of the servo motor is fixed on the other side of the mounting base. The movable end of the rotary joint is connected to the adjacent side tube, and the fixed end of the rotary joint is connected to a bellows, which is connected to the fire extinguishing agent supply mechanism.

5. A low-voltage distribution cabinet with a fireproof structure according to claim 1, characterized in that: Two T-shaped baffles are movably inserted near the end of the spray pipe, and a connecting rope located at the end of the spray pipe is connected between the two T-shaped baffles. Connecting blocks are fixed on both sides of the injection pipe between two T-shaped baffles, and connecting springs are connected between each connecting block and each T-shaped baffle. Under normal conditions, the connecting rope is taut and the connecting springs are compressed.

6. A low-voltage distribution cabinet with a fireproof structure according to claim 1, characterized in that: The cabinet is fixed with a partition between two adjacent mounting seats. The partitions work together to divide the cabinet into electrical cavities corresponding to each mounting seat. A fire detector is fixed in each electrical cavity, and each fire detector is connected to the main controller.

7. A low-voltage distribution cabinet with a fireproof structure according to claim 6, characterized in that: The mounting base has several electrical components arranged horizontally, and the electrical components on two adjacent mounting bases are connected by wires.

8. A low-voltage distribution cabinet with a fireproof structure according to claim 7, characterized in that: The partition is hollow inside, and the wiring between two adjacent rows of electrical components passes through the partition. A cutting mechanism for cutting the wiring is provided inside the partition.

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