Dual fire-extinguishing low-voltage integrated distribution cabinet

Abstract

This invention discloses a dual-fire-extinguishing low-voltage integrated distribution cabinet, comprising a cabinet body and a cabinet door. The cabinet body has a cavity, and both side walls of the cabinet body have ventilation holes communicating with the cavity. Several dust collection tanks are detachably connected to the inner wall of the cabinet door, each filled with fire extinguishing powder. Each dust collection tank has a first unlocking structure for rapidly spraying the fire extinguishing powder into the cavity when the cavity heats up quickly. The top of the cabinet body has a gas storage chamber filled with inert gas. A sealing plate is movably installed at the ventilation holes. The cavity has an interlocking structure for driving the sealing plate to slide rapidly and close the ventilation holes when the cavity heats up quickly, and a second unlocking structure for cooperating with the interlocking structure to release the inert gas from the gas storage chamber into the cavity when the interlocking structure is triggered. This invention solves the problem that existing outdoor low-voltage integrated distribution cabinets are difficult to self-extinguish when ignited in unattended scenarios, leading to the easy spread and expansion of fires.

Description

Technical Field

[0001] This invention relates to the field of low-voltage integrated distribution cabinet technology, specifically a dual fire-extinguishing low-voltage integrated distribution cabinet. Background Technology

[0002] Low-voltage integrated switchgear (JP cabinet) is the core equipment of the power distribution system at the terminal of a power distribution network. It is widely used in various scenarios such as outdoor transformer substations, rural power grids, and industrial parks. Internally, it has a cavity to house numerous live components such as circuit breakers, busbars, cable joints, and metering elements, providing stable low-voltage power distribution services to surrounding users and equipment. Due to the complex outdoor environment and the fact that JP cabinets are often unattended for extended periods, their operational safety and fire prevention capabilities are crucial to ensuring the stable operation of the power distribution network.

[0003] To address the heat dissipation issues arising from the long-term operation of internal components, existing outdoor low-voltage integrated distribution cabinets typically have ventilation holes on both side walls that connect to the cabinet cavity. This allows for heat dissipation through airflow, preventing component failures such as short circuits and aging due to overheating. Furthermore, according to relevant regulations from the State Grid Corporation of China (based on the State Grid Materials Department's "14 Measures to Improve the Quality of JP Cabinets" and relevant technical specifications for JP cabinet grid connection), only essential electrical components required for power distribution can be installed inside the JP cabinet. The addition of unnecessary electrical components such as pumps and solenoid valves is strictly prohibited to reduce the risk of spontaneous combustion inside the cabinet. However, this heat dissipation structure, combined with existing fire extinguishing solutions, has inherent technical defects, directly resulting in insufficient fire prevention capabilities for the JP cabinet and failing to meet actual operational needs.

[0004] Currently, JP cabinets with fire extinguishing functions on the market are mainly divided into two types: one type is equipped with a gas cylinder for releasing inert gas, which dilutes oxygen to extinguish fires. However, because JP cabinets usually have ventilation holes to meet heat dissipation requirements, the inert gas will quickly leak from the ventilation holes after being released, making it impossible to maintain the low oxygen concentration required for fire extinguishing, resulting in extremely poor fire extinguishing effect. The other type is equipped with a dust canister for spraying fire extinguishing powder. However, most of these devices are triggered by additional electrical components. Too many electrical components will increase the load on the internal wiring of the JP cabinet, which will increase the risk of spontaneous combustion of the cabinet itself. This is contrary to the relevant regulations of the State Grid and the State Power Grid (the State Grid Materials Department's "14 Measures to Improve the Quality of JP Cabinets", the JP Cabinet Network Access Technical Specifications and the GB 7251 series JP Cabinet General Standards) and cannot be adapted to outdoor unattended operation scenarios.

[0005] Based on this, the existing fire extinguishing solutions still have obvious shortcomings: on the one hand, the heat dissipation holes are always open, which makes it impossible for the cabinet to form an effective seal, further aggravating the failure of inert gas fire extinguishing. Moreover, the existing single dry powder fire extinguishing method has no linkage triggering mechanism, the spray range is limited, there are fire extinguishing dead corners, and it cannot continuously isolate oxygen. After the fire is extinguished, it is easy for reignition and smoldering to occur, making it difficult to completely extinguish the fire inside the cabinet.

[0006] On the other hand, dry powder fire extinguishing devices that rely on electrical components for triggering are prone to short circuits and malfunctions in harsh outdoor environments such as humidity, high temperatures, dust, and lightning strikes. Furthermore, they are completely inoperable during power outages, failing to meet the self-extinguishing requirements of unattended scenarios. Simultaneously, the normally open ventilation holes become channels for fire spread. After ignition, flames and high-temperature smoke can escape through these holes, igniting surrounding wiring and equipment, expanding the fire's impact area. Additionally, external oxygen can continuously enter the cavity through the ventilation holes, exacerbating the fire's spread. Summary of the Invention

[0007] To address the shortcomings of existing technologies, this invention provides a dual fire-extinguishing low-voltage integrated distribution cabinet, which solves the problem that existing outdoor low-voltage integrated distribution cabinets are difficult to self-extinguish when internal fires occur in unattended scenarios, leading to the easy spread and expansion of fires.

[0008] To achieve the above objectives, the present invention provides a dual fire-extinguishing low-voltage integrated distribution cabinet, comprising a cabinet body and a cabinet door. The cabinet body has a cavity for accommodating external electrical components. The cabinet door is movably mounted on the cabinet body to expose or close the cavity. Heat dissipation holes communicating with the cavity are provided on both side walls of the cabinet body. Several dust storage tanks are detachably connected to the inner wall of the cabinet door, and each dust storage tank is filled with fire extinguishing powder. Each dust storage tank has a first unlocking structure for rapidly spraying the fire extinguishing powder into the cavity when the cavity heats up rapidly. A gas storage cavity is provided at the top of the cabinet body and is filled with inert gas. A sealing plate is movably mounted at the heat dissipation holes. The cavity has an interlocking structure for driving the sealing plate to slide rapidly and close the heat dissipation holes when the cavity heats up rapidly, and a second unlocking structure for cooperating with the interlocking structure to allow the inert gas inside the gas storage cavity to be discharged into the cavity when the interlocking structure is triggered.

[0009] The advantages of adopting the above technical solution are as follows: The cavities in the cabinet provide stable storage space for electrical components, ensuring their orderly installation and operation. The movable cabinet door allows for flexible exposure and closure of the cavities, facilitating component inspection and maintenance. The ventilation holes on both sides of the cabinet enable daily ventilation and heat dissipation, preventing internal electrical components from overheating, aging, or short-circuiting, thus ensuring the stable operation of the distribution cabinet. The detachable dust storage tanks on the inner wall of the cabinet door facilitate installation, disassembly, and maintenance. Their number can be flexibly arranged according to the size of the cavities, providing a stable storage medium for fire extinguishing powder. The first unlocking mechanism on the dust storage tank automatically triggers when the cavity heats up rapidly, ensuring timely discharge of the fire extinguishing powder. This allows for rapid response in the event of spontaneous combustion within the cabinet. Fire extinguishing; the inert gas stored in the gas storage chamber at the top of the cabinet can assist in fire extinguishing during a fire. When the interlocking structure is triggered, it drives the sealing plate to close the heat dissipation holes, preventing external oxygen from entering the cavity and intensifying the fire. Through the second unlocking structure linked with the interlocking structure, it ensures that the inert gas is discharged into the cavity in time, forming a double fire extinguishing protection with the fire extinguishing powder, improving the fire safety of the distribution cabinet, and comprehensively protecting the safety of electrical components and the surrounding environment. The inert gas and fire extinguishing powder are triggered simultaneously. Through their coordinated action, the fire extinguishing powder can quickly suppress open flames, while the inert gas simultaneously fills the cavity to isolate oxygen, forming a double fire extinguishing protection. No additional electrical control components are required, thus complying with State Grid standards, thereby avoiding the risk of spontaneous combustion, suitable for outdoor unattended scenarios, and can effectively prevent the spread of fire.

[0010] The invention further comprises: a dust storage chamber is provided in the hollow dust storage tank, the fire extinguishing powder is filled in the dust storage chamber, a piston head and a piston rod are movably disposed in the dust storage chamber, the beginning of the dust storage chamber is connected to the beginning of the dust storage tank and forms a spray port for the fire extinguishing powder inside the dust storage chamber to be sprayed out, the end of the dust storage chamber is connected to the end of the dust storage tank and forms a movable port for the end of the piston rod to move, the beginning of the piston rod is coaxially connected to the piston head so as to drive the piston head to move when the piston rod moves, a loading spring is provided inside the dust storage chamber, the loading spring is sleeved on the piston rod, the beginning of the loading spring is abutted against the bottom wall of the dust storage chamber, the end of the loading spring is abutted against the piston head, and the loading spring is linked and cooperated with the first unlocking structure so that when the first unlocking structure is unlocked, the loading spring is linked to deform the loading spring and apply an axial force to the piston head.

[0011] The advantages of adopting the above technical solution are as follows: The dust storage chamber in the dust storage tank provides a dedicated storage space for the extinguishing powder, preventing the powder from getting damp, clumping, or leaking, thus ensuring the extinguishing performance of the powder. The movable piston head in the dust storage chamber can compress the extinguishing powder to achieve directional spraying, ensuring that the powder accurately covers the fire source area. The spray nozzle at the beginning of the dust storage chamber provides a smooth spraying channel for the extinguishing powder, ensuring that the powder is quickly sprayed to the electrical components, thereby realizing the fire extinguishing operation. The movable port at the end of the dust storage chamber provides movement space for the piston rod end, preventing jamming when the piston rod moves and ensuring smooth linkage. The loading device fitted on the piston rod... The spring can be pre-loaded to ensure that the elastic force is quickly released after the first unlocking structure is unlocked, thereby driving the piston rod to move the piston head quickly. The two ends of the loading spring abut against the bottom wall of the dust storage chamber and the piston head respectively, which can stably apply axial force to the piston head, pushing the piston head to quickly squeeze the powder, thereby improving the spraying efficiency. The loading spring and the first unlocking structure work together to ensure that the extinguishing powder can be sprayed quickly when the first unlocking structure is triggered. At the same time, the overall structure does not require additional electrical control components, complies with the State Grid standards, avoids the risk of spontaneous combustion caused by unnecessary electrical components, simplifies the maintenance process, reduces the equipment failure rate, and is suitable for cabinet door installation scenarios.

[0012] The invention further includes the following configuration: two first insertion holes are passed through the piston rod; the first unlocking structure includes two fusible pins, which are located in the dust storage chamber; the two fusible pins correspond one-to-one with the two first insertion holes and are inserted into each other; a second insertion hole is provided on the outer peripheral wall of the dust storage tank corresponding to both ends of the two fusible pins; each end of the fusible pin passes through its corresponding second insertion hole and forms a heat-conducting end; the first unlocking structure also includes four heat-conducting plates, which correspond one-to-one with four heat-conducting ends; the heat-conducting plates are attached to the outer peripheral wall of the dust storage tank, and the starting end of the heat-conducting plate has a heat-conducting hole for the corresponding heat-conducting end to be inserted; the inner peripheral wall of the heat-conducting hole is in contact with the outer peripheral wall of the heat-conducting end; the heat-conducting plate is made of a heat-conducting metal material, and the fusible pin is made of a fusible metal material.

[0013] The advantages of adopting the above technical solution are as follows: The two first insertion holes on the piston rod provide precise installation and positioning points for the fusible pins, ensuring stable insertion. The one-to-one correspondence between the two fusible pins and the first insertion holes enables dual limiting of the piston rod, improving limiting stability and preventing accidental spraying or failure to trigger due to the failure of a single fusible pin. This ensures stable force storage of the loading spring under normal conditions. Furthermore, the fusible pins, located within the dust storage chamber, can accurately receive temperature signals from the chamber, ensuring timely triggering. The second insertion hole on the outer wall of the dust storage tank provides channels for the two ends of the fusible pins to pass through, forming heat-conducting ends for easy heat transfer. The four heat-conducting plates correspond one-to-one with the four heat-conducting ends, enabling precise heat conduction and avoiding uneven temperature distribution. The aforementioned heat-conducting plates are attached to… Located on the outer perimeter of the dust storage tank, the heat conduction area is increased, improving heat transfer efficiency. The heat conduction holes in the heat conduction plate are in close contact with the heat conduction end, ensuring rapid heat transfer to the fusible pin and avoiding trigger lag. In the above technology, the heat conduction plate is made of heat-conducting metal, further enhancing heat conduction performance and ensuring rapid high-temperature transfer. The fusible pin is made of fusible metal, which can be precisely melted and unlocked at a set temperature, ensuring that the extinguishing powder can be quickly sprayed out to extinguish the fire in the event of spontaneous combustion of electrical components inside the JP cabinet. The above technology not only solves the problem of temperature conduction lag but also complies with State Grid standards. The fire extinguishing mechanism is triggered through a purely mechanical structure, thereby avoiding the risk of spontaneous combustion of additional electrical components and improving the reliability of fire extinguishing.

[0014] The present invention further comprises: a connecting ring integrally connected to the beginning end of the dust storage tank; the shaft hole of the connecting ring is coaxially arranged with the injection port; a disassembly cover is threadedly connected to the outer peripheral wall of the connecting ring; a through hole is passed through the disassembly cover; the through hole is coaxially connected with the injection port; and a sealing piece for sealing the through hole is provided in the through hole; the sealing piece is made of fusible metal.

[0015] The advantages of adopting the above technical solution are as follows: The connecting ring integrally connected at the beginning of the dust storage tank provides an installation carrier for the disassembly cover. The connecting ring and the disassembly cover are threaded together, making disassembly and assembly convenient and facilitating the replenishment of extinguishing powder into the dust storage chamber later, reducing maintenance costs, while ensuring the connection is sealed. The shaft hole of the connecting ring is coaxially set with the spray nozzle, which can ensure that the through hole and the spray nozzle are precisely aligned after the disassembly cover is installed, avoiding powder spray deviation and ensuring smooth spraying. The sealing plate in the through hole can seal the through hole under normal conditions, preventing extinguishing powder leakage and ensuring the sealing of powder storage. Moreover, the sealing plate is made of fusible metal material, which can melt simultaneously when the cavity is heated, without hindering the spraying of extinguishing powder, ensuring linkage with the first unlocking structure, realizing the triggering of extinguishing powder, improving extinguishing efficiency, while not adding additional electrical control components, conforming to the State Grid standard, avoiding the risk of spontaneous combustion, and having a simple structure and high reliability.

[0016] The present invention further comprises: the end of the heat-conducting sheet is connected to the beginning of the dust storage tank and bent to form a temperature-sensing part; a plurality of the temperature-sensing parts are arranged around the disassembly cover; a first sealing ring is provided circumferentially on the outer peripheral wall of the piston head; a second sealing ring is provided circumferentially on the inner peripheral wall of the movable port; and both the first sealing ring and the second sealing ring are made of sealing rubber material.

[0017] The advantages of adopting the above technical solution are as follows: The temperature-sensing part formed by bending the end of the heat-conducting plate, arranged around the disassembly cover, can expand the temperature-sensing range, accurately capture high-temperature signals within the cavity, improve the timeliness of heat conduction, and ensure rapid melting of the fusible pin. Furthermore, the surrounding arrangement of several temperature-sensing parts can avoid triggering delays caused by uncaptured localized high temperatures, ensuring rapid activation of the extinguishing powder. The first sealing ring on the outer peripheral wall of the piston head enhances the sealing between the piston head and the inner wall of the dust storage chamber, preventing leakage of the extinguishing powder from the gap between them, while ensuring stable pressure when the piston head squeezes the powder, thus improving spray efficiency. The second sealing ring on the inner peripheral wall of the movable port enhances the sealing between the piston rod and the movable port, preventing external dust and moisture from entering the dust storage chamber, preventing the extinguishing powder from becoming damp and clumping, and ensuring the extinguishing performance of the powder. The first and second sealing rings are made of sealing rubber material, which has excellent sealing performance, is wear-resistant, and high-temperature resistant, suitable for the working environment of the dust storage tank, and extends the service life of the equipment.

[0018] The present invention further comprises: the interlocking structure includes four fusible heads, and each of the four corners of the sealing plate is provided with a locking hole for the fusible head to be locked in. The four fusible heads are respectively disposed in the four locking holes. The fusible heads are connected to the inner wall of the cavity. The fusible heads are made of fusible metal material.

[0019] The advantages of adopting the above technical solution are as follows: The four fusible heads of the interlocking structure are respectively locked in the four corner holes of the sealing plate, which can achieve stable positioning of the sealing plate, ensuring that the sealing plate will not slide arbitrarily under normal conditions, ensuring normal ventilation and heat dissipation of the heat dissipation holes. Moreover, the four fusible heads are located at the four corners of the sealing plate, which can make the sealing plate evenly stressed. After unlocking, it can slide smoothly and quickly, avoiding the sealing plate tilting and causing poor sealing. The fusible heads are connected to the inner wall of the cavity, which is firmly fixed and easy to install, ensuring stable positioning under normal conditions. The fusible heads are made of fusible metal, which can melt in time when the cavity heats up rapidly, releasing the positioning of the sealing plate and ensuring that the sealing plate slides quickly to close the heat dissipation holes, creating sealing conditions for inert gas fire extinguishing. The above structure does not require additional electrical control components, and is purely mechanically triggered by temperature sensing, which complies with the relevant State Grid specifications and avoids the risk of spontaneous combustion caused by unnecessary electrical components. At the same time, it can be linked with the second unlocking structure to ensure that the sealing plate closes the heat dissipation holes and the inert gas is released simultaneously, ensuring the dual fire extinguishing synergy, improving the reliability of fire extinguishing, and is suitable for outdoor unattended scenarios.

[0020] The present invention further comprises: the second unlocking structure including a heat transfer plate disposed on the inner wall of the cavity, the heat transfer plate being disposed at the center of the top wall of the cavity, the heat transfer plate having an extension portion extending toward the heat dissipation hole, the extension portion having a support plate extending at each fusible head position, the support plate having an abutment groove, the abutment groove being arc-shaped and the inner wall of the abutment groove partially abutting against the outer peripheral wall of the fusible head, the heat transfer plate being made of a thermally conductive metal material.

[0021] The advantages of adopting the above technical solution are as follows: In the above technology, the heat transfer plate is located at the center of the top wall of the cavity, which can quickly receive the heat inside the cavity and improve the heat conduction efficiency. Its extension extends towards the heat dissipation hole, and the support plate is correspondingly set with the fusible head. The abutment groove abuts against the outer peripheral wall of the fusible head, which can quickly conduct the heat absorbed by the heat transfer plate to each fusible head, ensuring that multiple fusible heads melt simultaneously and avoiding the failure of the sealing plate to close in time due to the delayed melting of a single fusible head; the abutment groove is arc-shaped, which can increase the contact area between the support plate and the fusible head and further improve the heat conduction effect; the heat transfer plate is made of thermally conductive metal material with excellent thermal conductivity, which can quickly respond to changes in cavity temperature, ensure that the interlocking structure is triggered in time, ensure that the sealing plate quickly closes the heat dissipation hole, and improve the fire prevention response speed.

[0022] The present invention further comprises: an air outlet is provided on the inner wall of the cavity corresponding to the position of the gas storage cavity, the air outlet is connected to the cavity and the gas storage cavity respectively, the second unlocking structure includes a sealing plate disposed in the air outlet and sealing the air outlet, the sealing plate is disposed near the cavity, the sealing plate is made of fusible metal, the heat transfer plate extends toward the sealing plate and has a heat-conducting part, the heat-conducting part is disposed near the sealing plate and partially contacts the sealing plate.

[0023] The advantages of adopting the above technical solution are as follows: the outlet connects the cavity and the storage cavity, providing a channel for inert gas to enter the cavity and ensuring that the inert gas can quickly enter the cavity to exert its fire extinguishing effect. The sealing plate seals the outlet, preventing leakage of inert gas inside the storage cavity, ensuring sufficient inert gas during a fire, and guaranteeing the fire extinguishing effect. The sealing plate is made of fusible metal, which can melt in time when the temperature rises, unlocking the outlet. The heat-conducting part of the heat transfer plate is close to the sealing plate and in partial contact with it, which can quickly conduct heat from the cavity to the sealing plate, ensuring that the sealing plate and the fusible head unlock synchronously, realizing the linkage between sealing and inert gas injection, avoiding delays in fire extinguishing, further enhancing the dual fire extinguishing effect, and improving the fire safety of the distribution cabinet.

[0024] The present invention further comprises: positioning grooves are provided on both sides of the heat dissipation hole, the positioning grooves extend toward the sealing plate, the radial cross-sectional area of ​​the sealing plate is larger than the radial cross-sectional area of ​​the heat dissipation hole, and positioning blocks are provided on the inner wall of the sealing plate corresponding to the two positioning grooves, the positioning blocks being slidably disposed in the positioning grooves.

[0025] The advantages of adopting the above technical solution are as follows: the positioning grooves on both sides of the heat dissipation holes provide guidance for the sliding of the sealing plate, ensuring that the sealing plate will not deviate from its direction during sliding and ensuring that the sealing plate can accurately seal the heat dissipation holes; the sliding cooperation between the positioning block and the positioning groove can enhance the stability of the sealing plate sliding, avoid jamming or shaking during the sliding of the sealing plate, and ensure that the sealing plate quickly enters the position; the radial cross-sectional area of ​​the sealing plate is larger than that of the heat dissipation holes, which can achieve complete sealing of the heat dissipation holes and prevent oxygen from entering due to sealing gaps; through the design of the above technical structure, the sliding efficiency and sealing effect of the sealing plate are improved, ensuring that the oxygen supply can be quickly blocked in the event of a fire, assisting inert gas to achieve efficient fire extinguishing, and ensuring the safety of the power distribution cabinet and the surrounding environment.

[0026] The invention further includes the following features: a base is provided on the inner wall of the cabinet door corresponding to the position of each dust storage tank; a wing plate is provided on the outer peripheral wall of the dust storage tank; the dust storage tank is placed on the corresponding base, and a connecting bolt is detachably connected between the wing plate and the base.

[0027] The advantages of adopting the above technical solution are: the base on the inner wall of the cabinet door provides stable support for the dust storage tank, ensuring that the dust storage tank will not move arbitrarily after installation and ensuring the stability of the dust storage tank during fire extinguishing; while the wing plate on the outer peripheral wall of the dust storage tank can increase the contact area with the base, improve the installation firmness of the dust storage tank, and the wing plate and the base are detachably connected by connecting bolts, which is simple in structure, convenient in operation, and facilitates the disassembly, installation and maintenance of the dust storage tank, and can quickly replace damaged dust storage tanks or replenish fire extinguishing powder. Attached Figure Description

[0028] Figure 1 This is a three-dimensional view of the present invention; Figure 2 This is a three-dimensional view of the present invention after removing the cabinet door and its linkage structure; Figure 3 This is a partial three-dimensional perspective view of the present invention after removing the cabinet door and its linkage structure; Figure 4 This is a three-dimensional view of the dust storage tank and its linkage structure of the present invention; Figure 5 for Figure 4 A sectional view. Detailed Implementation

[0029] This invention provides a dual fire-extinguishing low-voltage integrated distribution cabinet, including a cabinet body 1 and a cabinet door 11. The cabinet body 1 has a cavity 12 for accommodating external electrical components. The cabinet door 11 is movably mounted on the cabinet body 1 to expose or close the cavity 12. Both side walls of the cabinet body 1 have heat dissipation holes 13 communicating with the cavity 12. Several dust collection tanks 2 are detachably connected to the inner wall of the cabinet door 11, and each dust collection tank 2 is filled with fire extinguishing powder. Each dust collection tank 2 has a first unlocking structure for rapidly spraying the fire extinguishing powder into the cavity 12 when the cavity 12 heats up rapidly. The top of the cabinet body 1 has a gas storage chamber 14 filled with inert gas. A sealing device is movably mounted at the heat dissipation holes 13. Plate 4, the cavity 12 is provided with an interlocking structure for driving the sealing plate 4 to slide rapidly and close the heat dissipation hole 13 when the cavity 12 heats up rapidly, and a second unlocking structure for linkage with the interlocking structure to discharge the inert gas inside the gas storage chamber 14 into the cavity 12 when the interlocking structure is triggered. The dust storage tank 2 is provided with an open dust storage chamber 21, and the fire extinguishing powder is filled in the dust storage chamber 21. A piston head 211 and a piston rod 212 are movably arranged in the dust storage chamber 21. The beginning of the dust storage chamber 21 is connected to the beginning of the dust storage tank 2 and forms a spray port 213 for the fire extinguishing powder inside the dust storage chamber 21 to be sprayed out. The end of the dust storage chamber 21 is connected to the end of the dust storage tank 2 and forms a movable port 214 for the piston rod 212 to move. The piston rod 212 is coaxially connected to the piston head 211 at its starting end so that the piston head 211 can move when the piston rod 212 moves. A loading spring 22 is provided inside the dust storage chamber 21. The loading spring 22 is sleeved on the piston rod 212. The starting end of the loading spring 22 abuts against the bottom wall of the dust storage chamber 21, and the end of the loading spring 22 abuts against the piston head 211. The loading spring 22 is linked to the first unlocking structure so that when the first unlocking structure is unlocked, the loading spring 22 deforms and applies an axial force to the piston head 211. Two first insertion holes 23 penetrate the piston rod 212. The first unlocking structure includes two fusible pins 3, which are located within the dust storage chamber 21. The two fusible pins 3 correspond one-to-one with the two first insertion holes 23 and are inserted into each other. Second insertion holes 24 are provided on the outer peripheral wall of the dust storage tank 2 at both ends corresponding to the two fusible pins 3. Each end of the fusible pin 3 extends through its corresponding second insertion hole 24 and forms a heat-conducting end 31. The first unlocking structure also includes four heat-conducting plates 32, each corresponding to one of the four heat-conducting ends 31. The heat-conducting plates 32 are attached to the outer peripheral wall of the dust storage tank 2, and each heat-conducting plate 32 has a heat-conducting hole 321 at its starting end for insertion into the corresponding heat-conducting end 31. The inner peripheral wall of the heat-conducting hole 321 contacts the outer peripheral wall of the heat-conducting end 31. The heat-conducting plates 32 are made of a heat-conducting metal, and the fusible pins 3 are made of a fusible metal.A connecting ring 25 is integrally connected to the beginning end of the dust storage tank 2. The shaft hole of the connecting ring 25 is coaxially arranged with the injection port 213. A disassembly cover 251 is threadedly connected to the outer peripheral wall of the connecting ring 25. A through hole 252 is passed through the disassembly cover 251 and coaxially communicates with the injection port 213. A sealing piece 26 for sealing the through hole 252 is provided in the through hole 252. The sealing piece 26 is made of fusible metal. The end of the heat-conducting plate 32 is connected to the beginning position of the dust storage tank 2 and bent to form a temperature sensing part 33. Several temperature sensing parts 33 are arranged around the disassembly cover 251. A first sealing ring 27 is circumferentially provided on the outer peripheral wall of the piston head 211. The movable A second sealing ring 28 is circumferentially provided on the inner peripheral wall of the opening 214. Both the first sealing ring 27 and the second sealing ring 28 are made of sealing rubber. The interlocking structure includes four fusible heads 41. Each of the four corners of the sealing plate 4 has a locking hole 42 for the fusible heads 41 to be engaged. The four fusible heads 41 are respectively disposed in the four locking holes 42. The fusible heads 41 are connected to the inner wall of the cavity 12. The fusible heads 41 are made of fusible metal. The second unlocking structure includes a heat transfer plate 5 disposed on the inner wall of the cavity 12. The heat transfer plate 5 is located at the center of the top wall of the cavity 12. The heat transfer plate 5 extends towards the heat dissipation hole 13 with an extension portion 51. The extension portion 51 corresponds to each fusible head. Each of the head 41 has a support plate 52 extending from it. Each support plate 52 has an abutment groove 53, which is arc-shaped and whose inner wall partially abuts against the outer peripheral wall of the fusible head 41. The heat transfer plate 5 is made of a thermally conductive metal. An outlet 15 is provided on the inner wall of the cavity 12 corresponding to the gas storage cavity 14. The outlet 15 communicates with both the cavity 12 and the gas storage cavity 14. The second unlocking structure includes a sealing plate 16 disposed in the outlet 15 and sealing it. The sealing plate 16 is located near the cavity 12 and is made of a fusible metal. A heat-conducting portion 54 extends from the heat transfer plate 5 toward the sealing plate 16. The heat-conducting part 54 is positioned near the sealing plate 16, and partially contacts the sealing plate 16. Positioning grooves 43 are provided on both sides of the heat dissipation hole 13, extending towards the sealing plate 4. The radial cross-sectional area of ​​the sealing plate 4 is larger than that of the heat dissipation hole 13. Positioning blocks 44 are provided on the inner wall of the sealing plate 4 at positions corresponding to the two positioning grooves 43, and these blocks 44 slide within the grooves. A base 6 is provided on the inner wall of the cabinet door 11 corresponding to each dust storage tank 2. A wing plate 29 is provided on the outer peripheral wall of the dust storage tank 2. The dust storage tank 2 is placed on the corresponding base 6, and a connecting bolt 61 detachably connects the wing plate 29 to the base 6.

[0030] Fire suppression activation procedure for dual-fire suppression low-voltage integrated distribution cabinet: 1. The initial stage of the fire triggers the temperature sensor. The fire inside the container is caused by electrical component failure or other reasons, and the temperature rises rapidly. The heat is simultaneously conducted to the heat-conducting plate of the dust storage tank, the fusible head of the interlocking structure, and the heat transfer plate of the second unlocking structure.

[0031] 2. Upon activation of the first stage of fire suppression, the heat-conducting plate transfers heat to the heat-conducting end of the fusible pin. The fusible pin melts upon heating and disengages from the first insertion hole of the piston rod, releasing the piston rod from its limit. The loading spring releases its elastic potential energy, pushing the piston head to move axially along the dust storage chamber, compressing the internal fire extinguishing powder. Simultaneously, the fusible sealing plate on the disassembled cover melts upon heating, and the fire extinguishing powder is rapidly sprayed into the cavity through the spray nozzle and through-hole, providing initial suppression of the initial fire.

[0032] 3. The interlocking structure is triggered synchronously. The heat transfer plate conducts heat to the four fusible heads through the extension support. The fusible heads melt when heated, releasing the clamps that fix the four corners of the sealing plate. Under its own weight or inertia, the sealing plate slides along the positioning groove through the positioning block, quickly covering and sealing the heat dissipation holes on both sides of the cabinet, blocking external oxygen from entering the cavity and preventing the fire from spreading further.

[0033] 4. The second fire suppression linkage is activated. The heat transfer plate conducts heat to the sealing plate through the heat conduction part. The sealing plate melts when heated, releasing the seal on the gas outlet. The inert gas inside the gas storage chamber is quickly discharged into the cavity through the gas outlet. It works synergistically with the sprayed fire extinguishing powder to reduce the oxygen concentration in the cavity, isolate the fire source, and completely extinguish the fire.

[0034] 5. After the fire is extinguished, wait for the temperature of the container to drop to a safe range, then remove the dust storage tank to replenish the extinguishing powder, replace the fusible pins and sealing plates, replace the melted fusible heads, sealing plates and damaged parts, and reset the sealing plate to ensure that the fire extinguishing structure of the power distribution cabinet is restored to normal standby status.

[0035] The aforementioned technical structure achieves automatic triggering in the early stages of a fire and a dual-stage fire suppression system, enabling rapid response to fires without manual intervention and significantly improving the timeliness and reliability of fire suppression. The first stage, rapid spraying of extinguishing powder, effectively suppresses the initial fire, buying time for subsequent firefighting efforts. The interlocking structure simultaneously seals the ventilation holes, blocking oxygen supply and curbing the spread of fire at its source. The second stage, inert gas spraying, works synergistically with the extinguishing powder to ensure complete extinguishment and prevent reignition. The entire activation process is logically coherent and seamlessly integrated, with close coordination between components. This ensures the safety of electrical components, reduces the impact of the fire on the surrounding environment, and allows for convenient component replacement and resetting after fire suppression, reducing maintenance costs and improving the long-term safety and stability of the distribution cabinet. It comprehensively meets the fire protection requirements of low-voltage integrated distribution cabinets.

[0036] In the aforementioned technologies, copper and aluminum alloys are preferred as the thermally conductive metal materials. These materials have high thermal conductivity and rapid heat transfer response, quickly conducting high temperatures inside the cabinet to fusible components to ensure sensitive fire detection. Simultaneously, the materials possess moderate mechanical strength, are easy to process and shape, and have excellent corrosion resistance. They are not prone to oxidation failure even after long-term use in the enclosed environment of the distribution cabinet, and are suitable for complex internal installation structures, balancing thermal efficiency and structural durability. Wood's alloy and low-melting-point bismuth-based alloys are preferred as the fusible metal materials, with their melting points controlled within the range of 90℃ to 120℃, slightly higher than... The normal operating temperature rise of the distribution cabinet is far below the open flame combustion temperature of an electrical fire. When an abnormal temperature rise to this range occurs inside the cabinet due to a short circuit or electric arc, it can melt and trigger in time. This avoids false triggering caused by normal operating temperature rise and can respond accurately in the early stage of an electrical fire before the open flame spreads violently. It can reliably release mechanical limits to achieve linkage unlocking. It has sufficient physical strength at room temperature and can stably undertake functions such as support, clamping, and sealing. When used with heat-conducting metals, it has good temperature matching and can ensure that the fire extinguishing mechanism is accurately triggered in the early stage of a fire, improving the reliability and consistency of the overall fire protection system.

[0037] In the above technology, an opening for replenishing inert gas can be designed on the top of the cabinet and sealed with a sealing plug or stopper.

[0038] The above instruction manual is attached Figure 4 Only two heat-conducting plates are shown in the diagram to avoid graphic interference. In reality, there are four, and the area of ​​the heat-conducting plates extending to the through-hole is small and will not affect the spraying of the extinguishing powder. Furthermore, when the fusible pin melts, the heat-conducting plates are no longer restricted by the fusible pin, thus detaching from the dust storage tank and avoiding interference with the extinguishing powder. The accompanying drawings in the above instruction manual are only used to illustrate the positional arrangement and linkage logic between the components, and only serve as a schematic diagram of the structural principle. They do not make a unique limitation on the specific outline, size ratio, installation angle, etc. of each component. The relevant structural forms can be flexibly adjusted and optimized according to actual assembly requirements, spatial layout, and working conditions.

[0039] The foregoing has shown and described the basic principles and main features of the present invention, as well as its advantages. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the present invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope. All such changes and modifications fall within the scope of the present invention as claimed, which is defined by the appended claims and their equivalents.

Claims

1. A dual-fire-extinguishing low-voltage integrated distribution cabinet, comprising a cabinet body and a cabinet door, wherein the cabinet body has a cavity for accommodating external electrical components, the cabinet door is movably mounted on the cabinet body to expose or close the cavity, and heat dissipation holes communicating with the cavity are provided on both side walls of the cabinet body, characterized in that: A number of dust storage tanks are detachably connected to the inner wall of the cabinet door, and each dust storage tank is filled with fire extinguishing powder. The dust storage tank is provided with a first unlocking structure for quickly spraying the fire extinguishing powder inside the dust storage tank into the cavity when the temperature inside the cavity rises rapidly. The top of the cabinet body is provided with a gas storage cavity filled with inert gas. A sealing plate is movably arranged at the heat dissipation hole. The cavity is provided with a linkage structure for driving the sealing plate to quickly slide and close the heat dissipation hole when the temperature inside the cavity rises rapidly, and a second unlocking structure for联动配合 with the linkage structure to discharge the inert gas inside the gas storage cavity into the cavity when the linkage structure is triggered. The dust storage tank is hollow and provided with a dust storage cavity. The fire extinguishing powder is filled in the dust storage cavity. A piston head and a piston rod are movably arranged in the dust storage cavity. The starting end of the dust storage cavity is connected to the starting end of the dust storage tank to form a spray port for spraying the fire extinguishing powder inside the dust storage cavity. The ending end of the dust storage cavity is connected to the ending end of the dust storage tank to form a movable port for the ending end of the piston rod to move. The starting end of the piston rod is coaxially connected to the piston head to drive the piston head to move when the piston rod is displaced. A loading spring is arranged inside the dust storage cavity. The loading spring is sleeved on the piston rod. The starting end of the loading spring is abutted against the bottom wall of the dust storage cavity. The ending end of the loading spring is abutted against the piston head. The loading spring is联动配合 with the first unlocking structure to deform the loading spring and apply an axial force to the piston head when the first unlocking structure is unlocked. Two first jacks are penetrated on the piston rod. The first unlocking structure includes two fusible pins. The two fusible pins are located in the dust storage cavity. The two fusible pins correspond to the two first jacks one by one and are inserted and arranged. Second jacks are opened at both ends of the two fusible pins on the outer peripheral wall of the dust storage tank. Both ends of the fusible pin respectively penetrate through the corresponding second jacks to form a heat conduction end. The first unlocking structure further includes four heat conduction sheets. The four heat conduction sheets correspond to the four heat conduction ends one by one. The heat conduction sheet is adhered to the outer peripheral wall of the dust storage tank, and a heat conduction hole for inserting the corresponding heat conduction end is opened at the starting end of the heat conduction sheet. The inner peripheral wall of the heat conduction hole is in contact with the outer peripheral wall of the heat conduction end. The heat conduction sheet is made of heat-conducting metal material, and the fusible pin is made of fusible metal material.

2. The dual fire-extinguishing low-voltage integrated distribution cabinet according to claim 1, characterized in that: A connecting ring is integrally connected to the starting end of the dust storage tank. The shaft hole of the connecting ring is coaxially arranged with the spray port. A disassembly cover is threadedly connected to the outer peripheral wall of the connecting ring. A through hole is penetrated on the disassembly cover. The through hole is coaxially communicated with the spray port. A sealing piece for closing the through hole is arranged in the through hole. The sealing piece is made of fusible metal material.

3. The dual fire-extinguishing low-voltage integrated distribution cabinet according to claim 1, characterized in that: The ending end of the heat conduction sheet is connected to the starting end position of the dust storage tank and is bent to form a temperature sensing part. A number of the temperature sensing parts are arranged around the disassembly cover. A first sealing ring is circumferentially arranged on the outer peripheral wall of the piston head. A second sealing ring is circumferentially arranged on the inner peripheral wall of the movable port. Both the first sealing ring and the second sealing ring are made of sealing rubber material.

4. A dual fire-extinguishing type low-voltage integrated distribution cabinet according to claim 1, characterized in that: The interlocking structure includes four fusible heads. Each of the four corners of the sealing plate has a locking hole for the fusible heads to be engaged. The four fusible heads are respectively disposed in the four locking holes. The fusible heads are connected to the inner wall of the cavity. The fusible heads are made of fusible metal.

5. A dual fire-extinguishing type low-voltage integrated distribution cabinet according to claim 4, characterized in that: The second unlocking structure includes a heat transfer plate disposed on the inner wall of the cavity. The heat transfer plate is located at the center of the top wall of the cavity. The heat transfer plate extends towards the heat dissipation hole and has an extension portion. Each extension portion has a support plate extending from it to each fusible head position. The support plate has an abutment groove. The abutment groove is arc-shaped and its inner wall partially abuts against the outer peripheral wall of the fusible head. The heat transfer plate is made of a thermally conductive metal material.

6. A dual fire-extinguishing type low-voltage integrated distribution cabinet according to claim 5, characterized in that: An air outlet is provided on the inner wall of the cavity corresponding to the position of the gas storage cavity. The air outlet is connected to the cavity and the gas storage cavity respectively. The second unlocking structure includes a sealing plate disposed in the air outlet and sealing the air outlet. The sealing plate is disposed near the cavity and is made of fusible metal. The heat transfer plate extends toward the sealing plate and has a heat-conducting part. The heat-conducting part is disposed near the sealing plate and partially contacts the sealing plate.

7. A dual fire-extinguishing type low-voltage integrated distribution cabinet according to claim 6, characterized in that: Positioning grooves are provided on both sides of the heat dissipation hole, and the positioning grooves extend towards the sealing plate. The radial cross-sectional area of ​​the sealing plate is larger than the radial cross-sectional area of ​​the heat dissipation hole. Positioning blocks are provided on the inner wall of the sealing plate at the positions corresponding to the two positioning grooves, and the positioning blocks are slidably disposed in the positioning grooves.

8. A dual fire-extinguishing type low-voltage integrated distribution cabinet according to claim 1, characterized in that: Each dust storage tank is provided with a base on the inner wall of the cabinet door. Each dust storage tank is provided with a wing plate on its outer peripheral wall. The dust storage tank is placed on the corresponding base and the wing plate is detachably connected to the base with connecting bolts.

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