Automatic fire extinguishing type electrical cabinet

Abstract

The invention relates to the technical field of electrical cabinets, and discloses a self-extinguishing electrical cabinet which comprises a box body and a box door, the box door is rotatably connected with the box body, exhaust windows are embedded in the two sides of the outer portion of the box body, a storage device is arranged at the top of the box body, and a control module and a display module are arranged on the two sides of the front face of the storage device respectively. Wherein the control module adopts a PLC as a core, receives a detection signal of the detection mechanism through an analog quantity input interface, outputs a control instruction to the processing host after logic judgment of an internal program, has a fault self-diagnosis function, and can monitor the medium allowance of the storage module in real time. The automatic fire extinguishing electrical cabinet is switched to a fire extinguishing medium passage to realize total flooding fire extinguishing in a closed space, sends a signal to an external power distribution system to slowly reduce voltage to avoid secondary arc, and triggers a sound-light alarm to remind a worker, so that the safety protection capability of the electrical cabinet is comprehensively improved, cooling protection and fire extinguishing emergency effects are considered, and the safety of the electrical cabinet is improved. The accident expansion risk is reduced.

Description

Technical Field

[0001] This invention relates to the field of electrical cabinet technology, specifically to an automatic fire-extinguishing electrical cabinet. Background Technology

[0002] Electrical cabinets belong to the field of electrical equipment safety protection and are mainly used in industrial production, power distribution systems and other scenarios to ensure the safe operation of electrical components inside the cabinet. They typically integrate functions such as operation status monitoring, temperature regulation and fire emergency response to cope with the risks of high temperature and fire that may occur during the operation of electrical components and maintain the stability of the electrical system.

[0003] Although existing electrical cabinets are equipped with control and display modules, the core components of the control module lack functional completeness and the ability to self-diagnose real-time faults related to the remaining media in the storage module. The display modules can only present basic operating parameters and do not support touch operation or historical data retrieval, making it difficult for staff to quickly and comprehensively grasp the real-time status of the equipment and resulting in poor ease of operation. Meanwhile, the storage modules of existing electrical cabinets often adopt non-independent designs or single-cavity structures. The cooling media do not contain rust inhibitors and defoamers, making them less adaptable to changes in ambient temperature and prone to failure due to temperature fluctuations. The fire extinguishing media mostly rely on simple pressure or gravity drive, making it difficult to achieve uniform coverage. In emergency response, when high temperatures are detected, existing equipment often only sprays cooling media through nozzles without opening sealed windows to expel hot and humid air, resulting in low cooling efficiency. When smoke or electric arcs are detected, fire extinguishing is often activated directly without first closing sealed windows to block the spread of flames and toxic fumes, or sending voltage reduction signals to the external power distribution system to avoid secondary arcing. There is also a delay in triggering audible and visual alarms, leading to loopholes in safety protection. It is impossible to balance cooling protection and fire extinguishing emergency effects, increasing the risk of accidents escalating. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an automatic fire-extinguishing electrical cabinet to solve the problems of low cooling efficiency, direct activation of fire extinguishing upon detection of smoke or electric arc without first closing the sealed windows to block the spread of flames and toxic fumes, failure to send a voltage reduction signal to the external power distribution system to avoid secondary electric arcs, and delays in triggering audible and visual alarms. These issues result in loopholes in safety protection, an inability to balance cooling protection and fire extinguishing emergency effects, and an increased risk of accident escalation.

[0005] To achieve the above objectives, the present invention provides the following technical solution: An automatic fire extinguishing electrical cabinet includes: a cabinet and a door, the door being rotatably connected to the cabinet; exhaust windows are embedded on both external sides of the cabinet; a storage unit is provided on the top of the cabinet; a control module and a display module are respectively provided on the front sides of the storage unit; the control module uses a PLC controller as its core, receives detection signals from the detection mechanism through an analog input interface, and outputs control commands to the processing host after internal program logic judgment; it also has a fault self-diagnosis function and can monitor the remaining medium level of the storage module in real time; the display module is a TFT LCD screen, connected to the processing host through an RS232 communication interface, and displays parameters such as the internal cavity temperature, remaining medium level, and equipment operating status (e.g., normal / warning / fault) in real time, and supports touch operation to retrieve historical data;

[0006] A water collection box is provided at the top of the inner cavity of the box, and a three-way valve is connected to the top of the water collection box. The inner cavity of the storage device is provided with two sets of storage modules. One set of storage modules is a cooling medium storage chamber, which contains a water-based coolant (containing 5% to 8% rust inhibitor and 2% to 3% defoamer, in a transparent liquid state, and is isolated from the other set of modules by a sealing partition to prevent freezing at low temperatures or deterioration at high temperatures).

[0007] The other group is a fire extinguishing medium storage chamber, which contains ABC dry powder fire extinguishing agent (the main component is ammonium dihydrogen phosphate, an ultra-fine powder with a particle size of 10-20μm, which is driven by inert gas to ensure uniform coverage during spraying). The output ports of the two storage modules are connected to the two input ports of the three-way valve respectively. The bottom of the storage unit is equipped with a processing host.

[0008] The control terminal of the processing host is connected to a three-way valve via a line. Spray nozzles are connected to both sides of the bottom of the water collection box. A detection mechanism is installed at the bottom of the water collection box. Window frames are connected to both sides of the inner cavity of the housing. The control terminal of each window frame is connected to a control line, and the other end of the control line is connected to the processing host. An electric linear slide rail module is installed inside the window frame. The electric linear slide rail module is driven by a DC servo motor and uses a ball screw transmission structure. After receiving pulse signals from the control line, the motor drives the slider to move linearly along the slide rail, thereby driving the opening and closing of the sealed window. The sealed window is made of flame-retardant ABS board, with high-temperature resistant silicone sealing strips pasted on the edges to ensure the sealing or opening accuracy of the exhaust window. The output terminal of the electric linear slide rail module is connected to the sealed window.

[0009] The temperature, smoke, and electric arc inside the chamber are detected by the testing agency. When the temperature inside the chamber reaches a predetermined threshold (such as 60℃-80℃, which can be preset by the main unit), the main unit receives the temperature sensor signal, first starts the pump, and at the same time controls the three-way valve to switch to connect with the cooling medium storage chamber. This allows the cooling medium in the storage chamber to be buffered by the water collection box and then discharged from the nozzle in a mist (spray angle 120°, coverage radius 0.5-1m) to quickly cool the inside of the chamber and prevent electrical components from aging or being damaged due to high temperature.

[0010] Simultaneously, the control circuit outputs an electrical signal to the electric linear slide rail module, driving the sealed window to move upward along the slide rail, releasing the seal on the exhaust window and allowing the hot and humid air generated during the cooling process to be discharged through the heat dissipation holes of the exhaust window, thus improving cooling efficiency. When the smoke sensor of the detection mechanism detects smoke inside the chamber, or the arc sensor detects an arc signal, the processing host immediately controls the electric linear slide rail module through the control circuit to drive the sealed window downward, completely sealing the exhaust window to prevent flames or toxic fumes from spreading outward;

[0011] Simultaneously, the three-way valve is switched to connect with the extinguishing medium storage chamber. The extinguishing medium, driven by inert gas, enters the water collection box and is sprayed in a diffused manner through the nozzles to perform total flooding extinguishing within the enclosed space of the chamber, ensuring that the flames are suppressed within 30 seconds. At the same time, the main unit sends a signal to the external power distribution system through the communication module to slowly reduce the external voltage (the voltage reduction rate is 0.5V / s to avoid the voltage drop causing a secondary arc). The red warning light flashes on the display module, and the audible and visual alarm of the safety module (preset on the top of the chamber) is triggered to issue a warning signal, reminding the staff to deal with the situation in time.

[0012] Preferably, the storage unit is provided with a waterproof shell, which is made of 304 stainless steel with a thickness of 1.5-2mm. The inner wall is coated with an epoxy resin anti-corrosion layer, and the weld seams are sealed by argon arc welding. The protection level reaches IP65, which can effectively prevent external rainwater and moisture from entering the storage module. In addition, both sets of storage modules are provided with a replenishment end on the top. The replenishment end is provided with a sealing cover on the outside. The sealing cover adopts a threaded connection and the inner wall is embedded with a nitrile rubber sealing gasket to prevent media leakage or external impurities from entering.

[0013] Preferably, a sealing sleeve is provided at the junction of the three-way valve with the water collection box and the storage container. The sealing sleeve is made of nitrile rubber and has a U-shaped cross-section, which tightly wraps the metal pipe at the interface to prevent leakage of the medium during transportation. Furthermore, the three-way valve is connected to the water collection box and the storage container through a flange. The flange is made of Q235 steel with a galvanized surface treatment and has 4 to 6 bolt holes. The bolts are made of high-strength stainless steel to ensure a stable connection structure and prevent loosening after long-term use.

[0014] Preferably, the inner cavity of the housing is equipped with a fixing frame that can be detached by bolts. The fixing frame is provided with fixing holes on the outside to accommodate electrical component mounting bolts of different specifications, meeting diverse fixing needs. Furthermore, a gasket is provided on the outside of the fixing hole. The gasket is made of silicone and has a certain degree of elasticity, which can buffer the pressure when the bolts are tightened, prevent wear on the surface of the fixing frame, and enhance the vibration resistance of the connection.

[0015] Preferably, the exterior of the cabinet door is equipped with an observation window made of double-layered tempered glass with a laminated middle layer, which is both heat-resistant and impact-resistant, allowing staff to observe the interior of the cabinet without opening the door. Furthermore, the interior of the cabinet door is equipped with a sealing sleeve made of EPDM rubber, continuously arranged along the edge of the door. When the door is closed, this sleeve fills the gap between the door and the cabinet, achieving dustproof, waterproof, and soundproof effects. A lock body is installed between the door and the cabinet, which can be a mechanical pin tumbler lock or an electronic combination lock. The mechanical lock has a key cross-key rate of ≤0.1%, while the electronic lock supports password, card swipe, or remote authorization unlocking, enhancing equipment security.

[0016] Preferably, the bottom of the housing is provided with a base, and the inner cavity of the base is embedded with a toolbox. The toolbox is made of ABS plastic and has internal dividers to store repair tools such as screwdrivers, multimeters, and insulating gloves. The toolbox has a pull-out design for easy access to tools. In addition, the bottom of the base is evenly provided with rubber feet. The rubber feet are made of natural rubber and have anti-slip textures on the bottom. The coefficient of friction is ≥0.8, which can effectively absorb ground vibration and prevent the equipment from sliding on the ground.

[0017] Preferably, the exhaust window includes an open plate, which is embedded in the outside of the housing through a sealing sleeve. The open plate is made of aluminum alloy with anodized surface treatment, which has strong corrosion resistance. Furthermore, the inner cavity of the open plate is uniformly provided with heat dissipation holes, which are circular. This ensures heat dissipation area while preventing foreign objects from entering the housing. During normal operation, the heat inside the housing can be carried away by air convection.

[0018] Preferably, the nozzle's inlet is equipped with a pump body, and the other end of the pump body is connected to a water collection box. The pump body is a miniature centrifugal water pump driven by a brushless motor, which can stably deliver cooling or fire extinguishing media. The pump body's control end is connected to the processing host via a line. The processing host adjusts the pump body motor speed through a PWM signal to achieve controllable adjustment of the media delivery flow rate. For example, a high flow rate (15L / min) is used for rapid cooling during cooling, and a medium flow rate (10L / min) is used for fire extinguishing to ensure uniform media coverage.

[0019] Preferably, the detection mechanism includes a smoke sensor, a temperature sensor, and an arc sensor. The temperature sensor is an NTC thermistor type, which converts changes in resistance into a temperature signal and transmits it to the processing host in real time. The smoke sensor is photoelectric, which uses the principle of light scattering to detect smoke particles. The arc sensor is a high-frequency current detection type, which can detect arc discharge signals of 50kHz-1MHz. It collects the current changes of the circuits inside the box through a coupling coil to determine whether an arc has been generated. Furthermore, the detection ends of the detection mechanism are evenly distributed in the inner cavity of the box, with 3 to 5 detection ends installed at the top, middle, and areas with dense electrical components inside the box, respectively, to ensure no detection blind spots.

[0020] Preferably, the processing host includes a housing, and the inner cavity of the housing houses a central processing unit, a storage module, an input interface, a communication module, and a power management module. The central processing unit is a 32-bit MCU; the storage module is an EEPROM; the input interface is a mixed analog and digital interface, capable of receiving signals from devices such as detection mechanisms, pumps, and electric linear guide modules, and the interface has overvoltage and overcurrent protection functions; the communication module supports RS485 or LoRa protocols, enabling communication with a remote monitoring system to achieve remote monitoring and control of equipment status; the power management module uses a switch. The power supply has an input voltage range of AC110V-220V and an output voltage of DC12V / 24V, with an output ripple of ≤50mV. It features overload, short circuit, and over-temperature protection functions to ensure stable power supply to the equipment. The main unit is equipped with a human-machine interface module and a safety module. The human-machine interface module includes physical buttons and a display interface, allowing manual setting of parameters such as temperature thresholds and fire suppression delay, and supports fault reset operations. The safety module has a built-in overload protection relay and an audible and visual alarm. When a fault is detected, it immediately cuts off the power to the relevant actuators and triggers an audible and visual alarm to prevent the fault from escalating.

[0021] Compared with the prior art, the present invention provides an automatic fire extinguishing electrical cabinet, which has the following beneficial effects:

[0022] This automatic fire extinguishing electrical cabinet, with a PLC controller as its core control module, is equipped with a TFT LCD display module that features fault self-diagnosis, real-time monitoring of storage module media levels, and real-time display of internal cavity parameters with touch operation for retrieving historical data. This enhances the timeliness and ease of operation of equipment status monitoring, allowing staff to quickly grasp the equipment's status. It features two independent storage modules: the cooling medium storage chamber contains water-based coolant with added rust inhibitors and defoamers, adaptable to a certain ambient temperature range; the fire extinguishing medium storage chamber contains fire extinguishing agent driven by inert gas, ensuring the stability and effectiveness of the corresponding media under different operating conditions, preventing cooling medium failure due to ambient temperature or uneven coverage of the fire extinguishing medium. When the temperature inside the cabinet reaches a predetermined threshold, the main unit can control the three-way valve to switch to the cooling medium path. Combined with the spray nozzles for cooling and the opening of the sealed window to expel hot and humid air, this effectively improves cooling efficiency and protects electrical components from high-temperature damage. When smoke or electric arc is detected, the main unit can first control the sealed window to close to prevent the spread of flames and toxic fumes, and then switch to the fire extinguishing medium path to achieve total flooding fire extinguishing in the enclosed space. At the same time, it sends a signal to the external power distribution system to slowly reduce the voltage to avoid secondary electric arcs and triggers an audible and visual alarm to remind personnel. This comprehensively improves the safety protection capabilities of the electrical cabinet, taking into account both cooling protection and fire extinguishing emergency effects, and reducing the risk of accident escalation. Attached Figure Description

[0023] Figure 1 This is a front view of the present invention;

[0024] Figure 2 This is a planar schematic diagram of the present invention;

[0025] Figure 3 This is a schematic diagram of the external structure of the storage device of the present invention;

[0026] Figure 4 This is a front view of the storage device of the present invention;

[0027] Figure 5 This is a schematic diagram illustrating the operation of the present invention.

[0028] In the diagram: 1. Box body; 11. Base; 12. Fixing frame; 13. Box door; 2. Exhaust window; 3. Storage container; 31. Control module; 32. Display module; 4. Three-way valve; 41. Processing host; 42. Water collection box; 43. Detection mechanism; 44. Sprayer head; 5. Window frame; 51. Control circuit; 52. Electric linear slide rail module; 53. Enclosed window. Detailed Implementation

[0029] 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.

[0030] This invention provides a technical solution; please refer to [link / reference]. Figure 1 and Figure 2 An automatic fire extinguishing electrical cabinet includes: a cabinet body 1 and a door 13, the door 13 being rotatably connected to the cabinet body 1. Exhaust windows 2 are embedded on both sides of the exterior of the cabinet body 1. A storage unit 3 is installed on the top of the cabinet body 1. A control module 31 and a display module 32 are respectively installed on the front sides of the storage unit 3. The control module 31 uses a PLC controller as its core, receives detection signals from the detection mechanism 43 through an analog input interface, and outputs control commands to the processing host 41 after internal program logic judgment. It also has a fault self-diagnosis function and can monitor the remaining medium level of the storage module in real time. The display module 32 is a TFT LCD screen, connected to the processing host 41 through an RS232 communication interface, displaying parameters such as the internal temperature of the cabinet body 1, the remaining medium level, and the equipment operating status (normal / warning / fault) in real time. It supports touch operation to retrieve historical data.

[0031] Please see Figure 3 and Figure 4 The top of the inner cavity of the housing 1 is provided with a water collection box 42, and the top of the water collection box 42 is connected to a three-way valve 4. The inner cavity of the storage container 3 is provided with two sets of storage modules. One set of storage modules is a cooling medium storage chamber, which contains a water-based coolant containing 5% to 8% rust inhibitor and 2% to 3% defoamer. It is a transparent liquid and is isolated from the other set of modules by a sealing partition to prevent freezing at low temperatures or deterioration at high temperatures.

[0032] The other group is a fire extinguishing medium storage chamber, which contains ABC dry powder fire extinguishing agent whose main component is ammonium dihydrogen phosphate, which is an ultra-fine powder with a particle size of 10-20μm. With the help of inert gas, it ensures uniform coverage during spraying. The output ports of the two storage modules are connected to the two input ports of the three-way valve 4 respectively. The bottom of the storage unit 3 is equipped with a processing host 41.

[0033] Please see Figure 4 and Figure 5The control terminal of the processing host 41 is connected to the three-way valve 4 via a line. Spray nozzles 44 are connected to both sides of the bottom of the water collection box 42. A detection mechanism 43 is set at the bottom of the water collection box 42. Window frames 5 are connected to both sides of the inner cavity of the box 1. The control terminal of the window frame 5 is connected to the control line 51, and the other end of the control line 51 is connected to the processing host 41. An electric linear slide rail module 52 is set in the inner cavity of the window frame 5. The electric linear slide rail module 52 is driven by a DC servo motor and cooperates with a ball screw transmission structure. After the motor receives the pulse signal from the control line 51, it drives the slider to move linearly along the slide rail, thereby driving the closed window 53 to open and close. The closed window 53 is made of flame-retardant ABS board, and the edges are pasted with high-temperature resistant silicone sealing strips to ensure the sealing or opening accuracy of the exhaust window 2. The output terminal of the electric linear slide rail module 52 is connected to the closed window 53.

[0034] The temperature, smoke, and electric arc inside the chamber 1 are detected by the detection mechanism 43. When the temperature inside the chamber 1 reaches a predetermined threshold such as 60℃-80℃, the processing host 41 can preset the temperature. The processing host 41 receives the temperature sensor signal, starts the pump, and controls the three-way valve 4 to switch to connect with the cooling medium storage chamber. The cooling medium inside the storage chamber 3 is buffered by the water collection box 42 and then discharged by the nozzle 44 in a mist spray angle of 120° with a coverage radius of 0.5-1m. This quickly cools the inside of the chamber 1 and prevents electrical components from aging or being damaged due to high temperature.

[0035] Simultaneously, the control circuit 51 outputs an electrical signal to the electric linear slide rail module 52, driving the closed window 53 to move upward along the slide rail, releasing the seal on the exhaust window 2, allowing the hot and humid air generated during the cooling process to be discharged through the heat dissipation holes of the exhaust window 2, thus improving the cooling efficiency. When the smoke sensor of the detection mechanism 43 detects smoke generated inside the box 1, or the arc sensor detects an arc signal, the processing host 41 immediately controls the electric linear slide rail module 52 through the control circuit 51 to drive the closed window 53 downward, completely sealing the exhaust window 2 to prevent the flame or toxic fumes from spreading outward;

[0036] Simultaneously, the three-way valve 4 is switched to connect with the fire extinguishing medium storage chamber. The fire extinguishing medium enters the water collection box 42 under the drive of inert gas and is sprayed in a diffused manner through the nozzle 44 to perform total flooding fire extinguishing in the closed space of the inner cavity of the box 1, ensuring that the flames are suppressed within 30 seconds. At the same time, the main unit 41 sends a signal to the external power distribution system through the communication module to slowly reduce the external voltage drop rate by 0.5V / s to avoid the voltage drop causing a secondary arc. The red warning light flashes through the display module 32, and at the same time, the audible and visual alarm of the safety module is triggered to issue a warning signal on the top of the box 1 to remind the staff to deal with it in time.

[0037] The storage module 3 is equipped with a waterproof shell made of 304 stainless steel with a thickness of 1.5-2mm. The inner wall is coated with an epoxy resin anti-corrosion layer, and the weld seams are sealed by argon arc welding. The protection level reaches IP65, which can effectively prevent external rainwater and moisture from entering the storage module. In addition, both sets of storage modules are equipped with a replenishment end on the top. The replenishment end is equipped with a sealing cover with a threaded connection and a nitrile rubber sealing gasket embedded in the inner wall to prevent media leakage or the entry of external impurities.

[0038] Sealing sleeves are installed at the junctions of the three-way valve 4 with the water collection box 42 and the storage tank 3. The sealing sleeves are made of nitrile rubber and have a U-shaped cross-section. They tightly wrap the metal pipes at the interface to prevent leakage of the medium during transportation. The three-way valve 4 is connected to the water collection box 42 and the storage tank 3 via a flange. The flange is made of Q235 steel with a galvanized surface. There are 4 to 6 bolt holes, and the bolts are made of high-strength stainless steel to ensure a stable connection structure and prevent loosening after long-term use.

[0039] The inner cavity of the housing 1 is equipped with a fixing bracket 12 that can be detached by bolts. The fixing bracket 12 is provided with fixing holes on the outside to accommodate different specifications of electrical component mounting bolts and meet diverse fixing needs. In addition, a gasket is provided on the outside of the fixing hole. The gasket is made of silicone and has a certain elasticity. It can buffer the pressure when the bolt is tightened, prevent the surface of the fixing bracket 12 from being worn, and enhance the vibration resistance of the connection.

[0040] The exterior of the cabinet door 13 is equipped with an observation window made of double-layered tempered glass with a laminated middle layer. This window is both heat-resistant and impact-resistant, allowing staff to observe the interior of the cabinet 1 without opening the door 13. The interior of the cabinet door 13 is fitted with a sealing sleeve made of EPDM rubber, which is continuously arranged along the edge of the door 13. When closed, this sleeve fills the gap between the door 13 and the cabinet 1, providing dustproof, waterproof, and soundproof protection. A lock body is installed between the door 13 and the cabinet 1. This lock body can be a mechanical pin tumbler lock or an electronic combination lock. The mechanical lock has a key cross-key rate of ≤0.1%, while the electronic lock supports password, card swipe, or remote authorization unlocking, enhancing equipment security.

[0041] The bottom of the housing 1 is equipped with a base 11, and a toolbox is embedded in the inner cavity of the base 11. The toolbox is made of ABS plastic and has internal dividers to store screwdrivers, multimeters, insulating gloves and other maintenance tools. The toolbox has a pull-out design for easy access to tools. In addition, rubber feet are evenly distributed on the bottom of the base 11. The rubber feet are made of natural rubber and have anti-slip textures on the bottom. The coefficient of friction is ≥0.8, which can effectively absorb ground vibration and prevent the equipment from sliding on the ground.

[0042] The exhaust window 2 includes an opening plate, which is embedded in the outside of the housing 1 through a sealing sleeve. The opening plate is made of aluminum alloy with anodized surface treatment, which has strong corrosion resistance. Furthermore, the inner cavity of the opening plate is uniformly provided with heat dissipation holes, which are circular. This ensures heat dissipation area while preventing foreign objects from entering the housing 1. During normal operation, the heat inside the housing 1 can be removed through air convection.

[0043] The nozzle 44 has a pump body at its inlet, and the other end of the pump body is connected to the water collection box 42. The pump body is a miniature centrifugal water pump driven by a brushless motor, which can stably deliver cooling or fire extinguishing media. The control end of the pump body is connected to the processing host 41 through a line. The processing host 41 adjusts the speed of the pump body motor through a PWM signal to realize the controllable adjustment of the media delivery flow rate. For example, a high flow rate of 15L / min is used for rapid cooling when cooling, and a medium flow rate of 10L / min is used for fire extinguishing to ensure uniform media coverage.

[0044] The detection mechanism 43 includes a smoke sensor, a temperature sensor, and an arc sensor. The temperature sensor is an NTC thermistor type, which converts the change in resistance value into a temperature signal and transmits it to the processing host 41 in real time. The smoke sensor is photoelectric and uses the principle of light scattering to detect smoke particles. The arc sensor is a high-frequency current detection type, which can detect arc discharge signals of 50kHz-1MHz. It collects the current change of the circuit inside the box 1 through a coupling coil to determine whether an arc has been generated. The detection ends of the detection mechanism 43 are evenly distributed in the inner cavity of the box 1. There are 3 to 5 detection ends, which are installed at the top, middle and dense areas of electrical components in the inner cavity of the box 1 to ensure that there are no detection blind spots.

[0045] The main unit 41 includes a housing, and the inner cavity of the housing houses a central processing unit, a storage module, input interfaces, a communication module, and a power management module. The central processing unit is a 32-bit MCU; the storage module is an EEPROM; the input interfaces are mixed analog and digital interfaces, capable of receiving signals from devices such as the detection mechanism 43, pump body, and electric linear guide module 52, and the interfaces have overvoltage and overcurrent protection functions; the communication module supports RS485 or LoRa protocols, enabling communication with a remote monitoring system for remote monitoring and control of equipment status; the power management module uses a switching power supply. The power supply has an input voltage range of AC110V-220V and an output voltage of DC12V / 24V with an output ripple of ≤50mV. It features overload, short circuit, and over-temperature protection functions to ensure stable power supply for the equipment. Furthermore, the main unit 41 is equipped with a human-machine interface module and a safety module. The human-machine interface module includes physical buttons and a display interface, allowing manual setting of parameters such as temperature threshold and fire extinguishing delay, and supports fault reset operations. The safety module has a built-in overload protection relay and an audible and visual alarm. When a fault is detected, it immediately cuts off the power supply to the relevant actuators and triggers an audible and visual alarm to prevent the fault from escalating.

[0046] This solution uses the detection mechanism 43 to detect the temperature, smoke and electric arc inside the chamber 1. When the temperature inside the chamber 1 reaches the predetermined threshold, the processing host 41 is activated to control the opening and closing of the three-way valve 4, so that the cooling medium inside the storage container 3 is discharged through the water collection box 42 and the nozzle 44 to quickly cool the inside of the chamber 1. The control circuit 51 is activated to control the electric linear slide rail module 52 and the sealing window 53 to release the seal on the exhaust window 2.

[0047] When the detection agency 43 detects an electric arc or smoke inside the housing 1, it activates the control circuit 51 to control the electric linear slide rail module 52 and the sealing window 53 to close the exhaust window 2. At the same time, it controls the three-way valve 4 to connect with the fire extinguishing medium inside the storage tank 3 and discharges it through the water collection box 42 and the nozzle 44 to extinguish the fire in the closed cavity of the housing 1. Simultaneously, it slowly reduces the external voltage through the main unit 41 and issues an early warning.

[0048] 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. 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 variations 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. An automatic fire-extinguishing electrical cabinet, comprising: The enclosure (1) and the door (13) are rotatably connected to the enclosure (1). The enclosure (1) has exhaust windows (2) embedded on both sides of its exterior. The top of the enclosure (1) is provided with a storage container (3). The front sides of the storage container (3) are respectively provided with a control module (31) and a display module (32). The top of the inner cavity of the enclosure (1) is provided with a water collection box (42). The top of the water collection box (42) is connected to a three-way valve (4). The inner cavity of the storage container (3) is provided with two sets of storage modules. The output ports of the two sets of storage modules are respectively connected to the two sets of input ports of the three-way valve (4). The bottom of the storage container (3) is provided with a processing host (41). The control terminal of the processing host (41) is connected to the three-way valve (4) via a line. Both sides of the bottom of the water collection box (42) are connected to nozzles (44). The bottom of the water collection box (42) is provided with a detection mechanism (43). Both sides of the inner cavity of the box (1) are connected to window frames (5). The control terminal of the window frame (5) is connected to a control line (51), and the other end of the control line (51) is connected to the processing host (41). The inner cavity of the window frame (5) is provided with an electric linear slide rail module (52), and the output terminal of the electric linear slide rail module (52) is connected to a closed window (53).

2. The automatic fire-extinguishing electrical cabinet according to claim 1, characterized in that: The storage unit (3) is provided with a waterproof shell, and both sets of storage modules are provided with a replenishment end on the top, and the replenishment end is provided with a closed cover.

3. The automatic fire-extinguishing electrical cabinet according to claim 1, characterized in that: The three-way valve (4) is provided with a sealing sleeve at the junction with the water collection box (42) and the storage container (3), and the three-way valve (4) is connected to the water collection box (42) and the storage container (3) through a flange.

4. An automatic fire-extinguishing electrical cabinet according to claim 1, characterized in that: The inner cavity of the box (1) is provided with a fixing frame (12) by means of bolts. The fixing frame (12) is provided with fixing holes on the outside and a gasket is provided on the outside of the fixing holes.

5. An automatic fire-extinguishing electrical cabinet according to claim 1, characterized in that: The exterior of the box door (13) is provided with an observation window, and the interior cavity of the box door (13) is provided with a sealing sleeve. A lock body is provided between the box door (13) and the box body (1).

6. An automatic fire-extinguishing electrical cabinet according to claim 1, characterized in that: The bottom of the box (1) is provided with a base (11), the inner cavity of the base (11) is fitted with a toolbox, and rubber pads are evenly provided on the bottom of the base (11).

7. An automatic fire-extinguishing electrical cabinet according to claim 1, characterized in that: The exhaust window (2) includes an opening plate, which is fitted onto the outside of the housing (1) through a sealing sleeve, and the inner cavity of the opening plate is uniformly provided with heat dissipation holes.

8. An automatic fire-extinguishing electrical cabinet according to claim 1, characterized in that: The nozzle (44) has a pump body at its inlet, and the other end of the pump body is connected to the water collection box (42). The control end of the pump body is connected to the processing host (41) via a line.

9. An automatic fire-extinguishing electrical cabinet according to claim 1, characterized in that: The detection mechanism (43) includes a smoke sensor, a temperature sensor and an arc sensor, and the detection ends of the detection mechanism (43) are evenly distributed in the inner cavity of the box (1).

10. An automatic fire-extinguishing electrical cabinet according to claim 1, characterized in that: The processing host (41) includes a housing, and the inner cavity of the housing is provided with a central processing unit, a storage module, an input interface, a communication module and a power management module. The processing host (41) is also equipped with a human-machine interaction module and a security module.

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