Distribution box with circuit protection function

Abstract

The invention relates to the technical field of power distribution equipment, in particular to a power distribution box with a circuit protection function, which comprises a box body, a bottom box mounted at the bottom of the box body, a top box mounted at the top of the box body, a cabinet door rotationally connected to the front side of the box body, a sealing structure arranged at the joint of the cabinet door and the box body, and a mounting plate mounted in the box body, a plurality of mounting seats are fixedly connected to the mounting plate; the bottom of the box body is detachably connected with a wiring assembly in a sealed mode, a gas storage assembly for storing inert gas is installed in the bottom box, the gas storage assembly is connected with a valve assembly in sealed communication with the box body in a sealed mode, and a circulating heat dissipation assembly in sealed communication with the interior of the box body is installed in the top box. The side wall of the top box is fixedly and hermetically provided with an exhaust assembly which is hermetically communicated with the circulating heat dissipation assembly; a cooling assembly communicating with the circulating heat dissipation assembly is arranged in the mounting base. According to the invention, cooperative protection of efficient sealing, rapid heat dissipation and safe arc extinguishing of the distribution box is realized, and the operation stability and safety of the circuit are significantly improved.

Description

Technical Field

[0001] This invention relates to the field of power distribution equipment technology, and more specifically to a power distribution box with circuit protection function. Background Technology

[0002] In industrial production, construction projects, and civil power systems, distribution boxes are core equipment for power distribution and control, and their operational stability is directly related to the safety of the entire power system.

[0003] However, traditional distribution boxes have poor sealing performance, and external dust and moisture can easily penetrate into the box, causing the electrical components to become damp and corrode, reducing their insulation performance, and leading to short circuit faults. At the same time, the electrical components inside the distribution box generate a lot of heat when they are working. Existing heat dissipation structures mostly use simple heat dissipation holes or cooling fans, which have low heat dissipation efficiency and heat can easily accumulate inside the box, causing the electrical components to age faster due to high temperature and shortening their service life.

[0004] In addition, during operation, the contacts of electrical components inside the distribution box inevitably need to be joined and separated. The separation of contacts will generate a high-temperature electric arc. If the arc cannot be extinguished quickly, it will cause contact erosion, ignition of insulation materials, or even phase-to-phase short circuit.

[0005] Therefore, how to achieve integrated protection of efficient sealing, rapid heat dissipation and safe arc extinguishing in the distribution box, and improve the stability and safety of circuit operation, is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] In order to achieve integrated protection of efficient sealing, rapid heat dissipation and safe arc extinguishing in the distribution box, this application provides a distribution box with circuit protection function.

[0007] The distribution box with circuit protection function provided in this application adopts the following technical solution: A distribution box with circuit protection function includes a box body, a bottom box fixedly and sealed at the bottom of the box body, a top box fixedly and sealed at the top of the box body, a cabinet door rotatably connected to the front side of the box body, a sealing structure provided at the fitting joint between the cabinet door and the box body, a mounting plate fixedly and sealed at the rear side of the box body, a plurality of mounting seats for mounting electrical components fixedly and sealed to the mounting plate, and symmetrically arranged conduits fixedly and sealed to both sides of the bottom box; a wiring assembly detachably and sealed to the bottom of the box body, a gas storage assembly for storing inert gas installed inside the bottom box, a valve assembly sealed and communicating with the box body through the gas storage assembly, a circulating heat dissipation assembly sealed and communicating with the interior of the box body installed inside the top box, an exhaust assembly fixedly and sealed to the side wall of the top box; the exhaust assembly is sealed and communicating with the circulating heat dissipation assembly, and a cooling component communicating with the circulating heat dissipation assembly is provided inside the mounting seat.

[0008] Furthermore, the wiring assembly includes a terminal block, and a terminal block mounting groove is provided on the bottom plate of the housing corresponding to the terminal block. The terminal block is detachably and sealingly connected to the bottom plate of the housing through the terminal block mounting groove. A plurality of conductive posts passing through both ends of the terminal block are fixedly and sealingly installed on the terminal block. Wire mounting holes are provided radially on the conductive posts near their two ends. Wire locking holes are provided at both ends of the conductive posts, passing through the wire mounting holes. Locking screws are threaded into the wire locking holes.

[0009] Furthermore, the gas storage assembly includes a gas storage tank, which is fixedly installed inside the base box. A first connecting pipe and a second connecting pipe are fixedly and sealed to the gas storage tank. A pressure sensor is fixedly and sealed to the first connecting pipe, and the second connecting pipe is sealed to the valve assembly.

[0010] Furthermore, the valve assembly includes a mounting box, which is fixedly embedded in the bottom plate of the housing. The front end of the mounting box has an clearance groove corresponding to the cabinet door. A gas guide cylinder is fixedly and sealed to the middle of the mounting box. An electric control valve is fixedly and sealed to the top of the gas guide cylinder through the bottom plate of the housing. The bottom of the gas guide cylinder is sealed and connected to the gas storage assembly.

[0011] Furthermore, the mounting box has a sliding block inside which a valve stem is fixedly connected. The middle part of the air guide tube has a sliding hole corresponding to the valve stem. The valve stem passes through the sliding hole and is slidably connected to the air guide tube. The valve stem has a valve hole corresponding to the air guide tube. The rear end of the valve stem is fixedly connected to a spring, which abuts against the inner end of the mounting box.

[0012] Furthermore, the circulating heat dissipation assembly includes a heat-conducting plate fixedly and sealed to the middle of the top box. A first heat dissipation fin is fixedly and thermally connected to the top surface of the heat-conducting plate, and a second heat dissipation fin is fixedly and thermally connected to the bottom surface of the heat-conducting plate. An air outlet is provided at the bottom of the top box corresponding to the position inside the housing located in front of the mounting plate, and a return air outlet is provided at the bottom of the top box corresponding to the position inside the housing located in rear of the mounting plate. A fan is fixedly installed at the air outlet corresponding to the second heat dissipation fin. A return air duct is installed on the mounting plate near its bottom, and an airflow sensor is installed on the return air duct. Symmetrically arranged ventilation openings are provided on the side wall of the top box corresponding to the first heat dissipation fin.

[0013] Furthermore, the exhaust assembly includes an exhaust pipe, which is fixedly and sealed on the side wall of the top box. The inner end of the exhaust pipe is sealed and connected to the top box and the interior of the housing. An electronically controlled exhaust valve and a gas concentration sensor are installed on the outer end of the exhaust pipe.

[0014] Furthermore, the cooling and heat dissipation assembly includes a cooling cavity formed inside the mounting base, an air guide slidably connected inside the cooling cavity, a piston cylinder fixedly and thermally connected inside the cooling cavity, a piston rod slidably connected inside the piston cylinder, a driving medium with thermal expansion and contraction characteristics filling the piston cylinder, and the outer end of the piston rod fixedly connected to the air guide slid; the mounting base has a plurality of cooling holes communicating with the cooling cavity, and the cooling holes face the electrical components.

[0015] Furthermore, the sealing structure includes a sealing ring, and sealing ring mounting grooves are provided on the front side of the box and the inner side of the cabinet door, and the sealing ring is fixedly installed inside the sealing ring mounting groove.

[0016] Furthermore, the inert gas is nitrogen.

[0017] Beneficial effects achieved: This application achieves efficient sealing, rapid heat dissipation, and safe arc extinguishing in the distribution box through the integrated design of the sealing structure, circulating heat dissipation components, and gas storage components, significantly improving the stability and safety of circuit operation.

[0018] This application employs a sealed connection design for key components such as the enclosure, cabinet doors, mounting plates, and wiring assemblies, combined with the fixed and sealed installation of the bottom and top boxes, forming a fully enclosed protective structure. This effectively prevents dust and moisture from entering, avoiding moisture-induced corrosion of electrical components and degradation of insulation performance, thus reducing the occurrence of short-circuit faults at the source.

[0019] This application directly connects the circulating heat dissipation component inside the top box with the cooling component inside the mounting bracket, enabling precise heat dissipation at the installation location of electrical components and preventing heat accumulation. This forms a highly efficient circulating heat dissipation loop in a sealed environment, solving the problem of low efficiency in traditional heat dissipation structures and delaying the high-temperature aging of electrical components.

[0020] This application stores inert gas through a gas storage component inside the bottom box and releases the inert gas into the box using a valve assembly. When the contacts separate and generate an electric arc, the inert gas can quickly extinguish the arc, preventing contact erosion, ignition of insulation materials, and phase-to-phase short circuits, thereby improving the operational safety of the distribution box. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of one embodiment of this application.

[0022] Figure 2 This is a structural exploded view of one embodiment of this application.

[0023] Figure 3 This is a schematic diagram of the internal structure of one embodiment of this application.

[0024] Figure 4 yes Figure 3 Schematic diagram of the cross-sectional structure along the AA direction.

[0025] Figure 5 This is an exploded view of the wiring assembly in one embodiment of this application.

[0026] Figure 6 This is an exploded view of the structure of the gas storage component and valve component in one embodiment of this application.

[0027] Figure 7 This is an exploded view of the structure of a circulating heat dissipation component in one embodiment of this application.

[0028] Figure 8 yes Figure 4 Enlarged schematic diagram of Part I of the structure.

[0029] Figure 9 yes Figure 4 Enlarged schematic diagram of Part II of the structure.

[0030] Figure 10 yes Figure 4 Enlarged schematic diagram of Part III of the structure.

[0031] Figure 11 This is an exploded view of the cooling component in one embodiment of this application.

[0032] Figure 12 yes Figure 4 Enlarged schematic diagram of Part IV of the structure.

[0033] Explanation of reference numerals in the attached drawings: 100, enclosure; 101, bottom box; 102, top box; 103, cabinet door; 104, sealing structure; 1041, sealing ring; 1042, sealing ring mounting groove; 105, mounting plate; 106, mounting base; 107, conduit; 200, wiring assembly; 201, terminal block; 202, terminal block mounting groove; 203, conductive post; 204, wire mounting hole; 205, wire locking hole; 206, locking screw; 300, gas storage assembly; 301, gas tank; 302, first connecting pipe; 303, second connecting pipe; 304, pressure sensor; 400, valve assembly; 401, mounting box; 402, clearance groove; 403, gas guide tube. ; 404, Electrically controlled valve; 405, Sliding block; 406, Valve stem; 407, Sliding hole; 408, Valve hole; 409, Spring; 500, Circulating heat dissipation assembly; 501, Heat-conducting plate; 502, First heat dissipation fin; 503, Second heat dissipation fin; 504, Air outlet; 505, Air return outlet; 506, Fan; 507, Air return duct; 508, Air volume sensor; 509, Ventilation opening; 510, Protective net; 600, Exhaust assembly; 601, Exhaust pipe; 602, Electrically controlled exhaust valve; 603, Gas concentration sensor; 700, Cooling and temperature reduction assembly; 701, Cooling chamber; 702, Air guide; 703, Piston cylinder; 704, Piston rod; 705, Cooling hole. Detailed Implementation

[0034] The following is in conjunction with the appendix Figure 1-12 This application will be described in further detail.

[0035] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0037] This application discloses a distribution box with circuit protection function.

[0038] Please refer to the above as well. Figures 1 to 12 In one embodiment of this application, a distribution box with circuit protection function includes a box body 100. A bottom box 101 is fixedly and sealed at the bottom of the box body 100, and a top box 102 is fixedly and sealed at the top of the box body 100. A cabinet door 103 is rotatably connected to the front side of the box body 100. A sealing structure 104 is provided at the contact point between the cabinet door 103 and the box body 100. A mounting plate 105 is fixedly and sealed at the interior of the box body 100 near its rear side. A plurality of mounting seats 106 for mounting electrical components are fixedly and sealed on the mounting plate 105. Conduits 107 are symmetrically arranged on both sides of the bottom box 101. A wiring assembly 200 is detachably and sealed at the bottom of the box body 100. The outer end of the wiring assembly 200 is connected to equipment outside the box body 100, and the inner end of the wiring assembly 200 is connected to the box body 100. The internal equipment connections are as follows: The bottom box 101 houses a gas storage assembly 300 for storing inert gas. The inert gas used is nitrogen, which is stable, low-cost, and has excellent arc-extinguishing performance. The gas storage assembly 300 is sealed to a valve assembly 400 that is sealed to the housing 100. The top box 102 houses a circulating heat dissipation assembly 500 that is sealed to the housing 100. The air inlet of the circulating heat dissipation assembly 500 is connected to the space inside the housing 100 located in front of the mounting plate 105, and the air outlet of the circulating heat dissipation assembly 500 is connected to the space inside the housing 100 located behind the mounting plate 105. An exhaust assembly 600 is fixedly and sealed to the side wall of the top box 102. The exhaust assembly 600 is sealed to the circulating heat dissipation assembly 500. The mounting base 106 houses a cooling and heat-reducing assembly 700 that is connected to the circulating heat dissipation assembly 500.

[0039] During operation, the enclosure 100 serves as the core load-bearing structure. Through the sealing of the cabinet door 103 and the sealing structure 104, and the fixed sealing of the mounting plate 105 and the enclosure, a sealed cavity is formed to prevent external dust, humidity, and impurities from entering the interior and affecting the operation of electrical components. The bottom box 101 and the top box 102 serve as functional extension areas for air storage, heat dissipation, and exhaust, respectively, and together with the enclosure 100, they constitute a complete sealing system.

[0040] External cables are introduced through conduits 107 on both sides of the bottom box 101 and sealed through the wiring assembly 200. The outer end of the wiring assembly 200 is connected to the external equipment of the enclosure, and the inner end is connected to electrical components such as circuit breakers and protection modules in the mounting base 106 on the mounting plate 105. This ensures the reliability of circuit conduction and also takes into account the convenience of operation and maintenance through the detachable sealed design, while preventing inert gas leakage and external media intrusion.

[0041] The inert gas stored in the gas storage component 300 in the bottom box 101 is introduced into the housing 100 through the valve assembly 400. When the contacts of the electrical components in the mounting base 106 are separated due to a fault and generate an electric arc, the chemical inertness of the inert gas can inhibit the reaction between the electric arc and the metal vapor, the high ionization energy characteristics limit plasma proliferation, quickly cool the electric arc and extinguish it, avoid the electric arc from burning the contacts or causing a short circuit, and ensure the effectiveness of the circuit protection action.

[0042] The circulating heat dissipation component 500 inside the top box 102 constructs a directional airflow loop. Its air inlet draws in inert gas carrying heat from the front side of the mounting plate 105 inside the enclosure 100, where electrical components are mounted. The air outlet directs the airflow to the rear side of the mounting plate 105. Simultaneously, it communicates with the interior of the mounting base 106 through the cooling component 700, directly removing the heat generated by the electrical components during operation. The exhaust component 600 is used to replace the gas inside the enclosure 100 to ensure the purity of the inert gas environment.

[0043] Throughout the entire operation, the components work together to achieve integrated functions of sealing protection, circuit conduction, inert gas arc extinguishing, and circulating heat dissipation. The inert gas ensures both arc extinguishing reliability and heat dissipation effectiveness, while the sealing structure enhances protection capabilities, ultimately achieving comprehensive protection of the circuit and meeting the safety requirements of industrial and civil power distribution scenarios.

[0044] It is understood that in other embodiments of this application, the inert gas may also be helium, argon, nitrogen, or a mixture thereof.

[0045] Please refer to the above as well. Figures 1 to 12 In one specific embodiment of this application, the wiring assembly 200 includes a terminal block 201. A terminal block mounting groove 202 is provided on the bottom plate of the housing 100 corresponding to the terminal block 201. The terminal block 201 is detachably and sealed to the bottom plate of the housing 100 through the terminal block mounting groove 202. A plurality of conductive posts 203 passing through both ends of the terminal block 201 are fixedly and sealed on the terminal block 201. A wire mounting hole 204 is provided on the conductive post 203 near its two ends along its radial direction. A wire locking hole 205 passing through the wire mounting hole 204 is provided at both ends of the conductive post 203. A locking screw 206 is threaded inside the wire locking hole 205.

[0046] During operation, the wiring assembly 200 serves as the core of the sealed connection between the internal and external circuits of the enclosure 100. Through modular design, it achieves the dual goals of reliable circuit conduction and enclosure sealing.

[0047] The terminal block 201 is embedded in the terminal block mounting groove 202 on the bottom plate of the enclosure 100. It is fixed by a combination of sealing ring and bolts to form a detachable sealed connection, which ensures that the terminal block 201 fits tightly with the bottom plate of the enclosure, preventing the leakage of internal inert gas and the intrusion of external dust and moisture, and also facilitates subsequent maintenance or replacement of the wiring assembly 200.

[0048] After the external cable passes through the conduit 107 of the bottom box 101, its core is inserted into the wire mounting hole 204 at one end of the conductive post 203; the wires of the electrical components inside the box 100 are correspondingly inserted into the wire mounting hole 204 at the other end of the conductive post 203. The conductive connection between the internal and external circuits is achieved through the metal material of the conductive post 203, ensuring stable current transmission.

[0049] After the wire is inserted into the wire mounting hole 204, tighten the locking screw 206 at the end of the conductive post 203. The locking screw 206 is pushed down along the thread in the wire locking hole 205 until it presses the wire core in the wire mounting hole 204. The mechanical pressure achieves a tight contact between the wire and the conductive post 203, effectively preventing the wire from becoming loose and causing poor contact and overheating.

[0050] The entire design, through the sealed installation of the terminal block, the conduction of the conductive post, and the fixing of the screw, achieves reliable connection of internal and external circuits while strictly ensuring the 100% airtightness of the enclosure. It is adapted to the overall requirements of inert gas arc extinguishing and circulating heat dissipation. At the same time, the detachable design takes into account the convenience of operation and maintenance, ensuring the safety and practicality of the circuit connection.

[0051] Please refer to the above as well. Figures 1 to 12 In one specific embodiment of this application, the gas storage assembly 300 includes a gas storage tank 301, which is fixedly installed inside the bottom box 101. A first connecting pipe 302 and a second connecting pipe 303 are fixedly and sealed to the gas storage tank 301. A pressure sensor 304 is fixedly and sealed to the first connecting pipe 302, and the second connecting pipe 303 is sealed to the valve assembly 400.

[0052] During operation, the gas storage component 300 serves as the core for storing and monitoring inert gas within the housing 100. Through its structural design for inert gas storage and pressure monitoring, it provides a stable source of inert gas for arc extinguishing and circulating heat dissipation.

[0053] The gas storage tank 301 is fixedly installed inside the base box 101 and pre-filled with sufficient inert gas as the gas supply source for the housing 100. The first connecting pipe 302 on the gas storage tank 301 is sealed to a pressure sensor 304, which collects the inert gas pressure data inside the gas storage tank 301 in real time, forming a pressure monitoring closed loop. When the pressure is lower than a preset threshold, it alerts the operator to refill the gas storage tank 301 with inert gas in time to prevent insufficient gas from causing protection failure. The second connecting pipe 303 on the gas storage tank 301 serves as a sealed connection channel between the gas storage tank 301 and the valve assembly 400. It adopts a fixed sealing design using welding combined with a sealing gasket, ensuring that the inert gas can smoothly enter the housing 100 through the valve assembly 400 while preventing gas leakage at the connection point, thus balancing conductivity and sealing.

[0054] The entire design, through the storage function of the gas tank 301, the monitoring function of the pressure sensor 304, and the diversion design of the dual connecting pipes, achieves stable supply, safe monitoring and sealed transmission of inert gas, providing reliable gas support for the overall protection logic of the distribution box, while adapting to the installation space and sealing requirements of the bottom box 101.

[0055] Please refer to the above as well. Figures 1 to 12 In one specific embodiment of this application, the valve assembly 400 includes a mounting box 401, which is fixedly embedded in the bottom plate of the housing 100. A clearance groove 402 is provided at the front end of the mounting box 401 corresponding to the cabinet door 103. A gas guide cylinder 403 is fixedly and sealed to the middle of the mounting box 401. An electric control valve 404 is fixedly and sealed to the top of the gas guide cylinder 403, penetrating the bottom plate of the housing 100. The bottom of the gas guide cylinder 403 is sealed and connected to the second connecting pipe 303 in the gas storage assembly 300. A sliding block 4 is slidably and sealed inside the mounting box 401. 05. A valve stem 406 is fixedly connected to the rear end of the sliding block 405. A sliding hole 407 is opened in the middle of the air guide cylinder 403 corresponding to the valve stem 406. The valve stem 406 passes through the sliding hole 407 and is slidably connected to the air guide cylinder 403 in a sealed manner. A valve hole 408 is opened on the valve stem 406 corresponding to the air guide cylinder 403. A spring 409 is fixedly connected to the rear end of the valve stem 406. The spring 409 abuts against the inner end of the mounting box 401 so that the valve stem 406 drives the sliding block 405 to slide towards the cabinet door 103, thereby causing the valve hole 408 to be misaligned and closed with the channel inside the air guide cylinder 403.

[0056] During operation, the valve assembly 400 serves as the control core for the conduction and cut-off of inert gas between the gas storage assembly 300 and the housing 100. It adopts a dual-mode design combining electrical control and mechanical interlocking to achieve precise supply and sealing isolation of inert gas.

[0057] When the cabinet door 103 is open, the spring 409 elastically abuts against the inner wall of the mounting box 401, pushing the valve stem 406 to drive the sliding block 405 to slide closer to the cabinet door 103; at this time, the valve hole 408 on the valve stem 406 is completely misaligned with the gas passage inside the air guide cylinder 403, and the air guide cylinder 403 is blocked by the solid part of the valve stem 406, forming a mechanically closed state, preventing the inert gas in the gas storage tank 301 from flowing into the box 100 without control, and ensuring the gas seal in the initial state.

[0058] After the cabinet door 103 is closed, the cabinet door 103 will push the sliding block 405 to drive the valve stem 406 to slide closer to the cabinet door 103, and the spring 409 will be compressed. At this time, the valve hole 408 on the valve stem 406 coincides with the gas passage inside the air guide cylinder 403. Then the electric control valve 404 is opened, and the inert gas in the gas storage tank 301 flows into the air guide cylinder 403 through the second connecting pipe 303 and enters the box 100 through the electric control valve 404 to complete the inert gas replenishment and maintain the inert gas environment inside the box.

[0059] The entire design achieves on-demand control of inert gas supply through the linkage logic of mechanical interlock and electronic control, while ensuring the airtightness of gas transmission through multiple sealing structures, providing stable gas channel control for arc extinguishing and circulating heat dissipation functions.

[0060] Please refer to the above as well. Figures 1 to 12 In one specific embodiment of this application, the circulating heat dissipation assembly 500 includes a heat-conducting plate 501 fixedly and sealed to the middle of the top box 102. A first heat dissipation fin 502 is fixedly and thermally connected to the top surface of the heat-conducting plate 501, and a second heat dissipation fin 503 is fixedly and thermally connected to the bottom surface of the heat-conducting plate 501. An air outlet 504 is provided at the bottom of the top box 102 corresponding to the position inside the box 100 at the front side of the mounting plate 105. An air return vent 505 is provided at the bottom of the top box 102 corresponding to the position inside the box 100 at the rear side of the mounting plate 105. A fan 506 is fixedly installed at the air outlet 504 corresponding to the second heat dissipation fin 503. An air return duct 507 is installed on the mounting plate 105 near its bottom, and an airflow sensor 508 is installed on the air return duct 507. Symmetrically arranged ventilation openings 509 are provided on the side wall of the top box 102 corresponding to the first heat dissipation fin 502, and a protective net 510 is installed at each ventilation opening 509.

[0061] During operation, the circulating heat dissipation component 500 serves as the core for directional heat dissipation of inert gas within the enclosure 100. Through a dual-loop design of internal inert gas circulating heat exchange and external air-assisted heat dissipation, it efficiently removes the working heat of electrical components.

[0062] After the fan 506 starts, a negative pressure is formed between the top box 102 and the housing 100, drawing in high-temperature inert gas from the front side of the mounting plate 105 inside the housing 100 through the air outlet 504. When the high-temperature inert gas flows through the second heat dissipation fin 503 on the bottom surface of the heat conduction plate 501, the heat is quickly transferred to the first heat dissipation fin 502 on the top surface through the heat conduction plate 501, and the inert gas itself is cooled. The cooled inert gas flows back to the rear side of the mounting plate 105 inside the housing 100 through the return air inlet 505 at the bottom of the top box 102, and then flows back to the electrical component area on the front side of the mounting plate 105 through the return air pipe 507, forming a closed loop circulation, continuously removing heat from the mounting base 106 and electrical components.

[0063] The heat transferred by the heat-conducting plate 501 is diffused into the top box 102 through the first heat dissipation fin 502. The ventilation vent 509 on the side wall of the top box 102 introduces ambient temperature air from outside, which exchanges heat with the first heat dissipation fin 502 and exhausts the heat to the outside of the box. The protective mesh 510 at the ventilation vent 509 prevents external dust and impurities from entering the top box 102, thus avoiding affecting the heat exchange efficiency of the heat dissipation fins and protecting the internal components.

[0064] The air volume sensor 508 installed on the return air duct 507 monitors the inert gas circulation air volume in real time: if the air volume is lower than the preset value, it can trigger the fan 506 to speed up to ensure stable heat dissipation; when the air volume is higher than the preset value, it can trigger the fan 506 to slow down to avoid wasting resources.

[0065] The heat-conducting plate 501 is fixedly and sealed in the middle of the top box 102, which not only realizes the heat conduction between the upper and lower heat dissipation fins, but also ensures the airtight isolation between the top box 102 and the casing 100, preventing inert gas leakage or external air intrusion. The positions of the air outlet 504 and the return air outlet 505 correspond to the front and rear side spaces of the mounting plate 105. Together with the airflow guiding design of the return air duct 507, it ensures that the inert gas flows precisely through the core heat-generating area, improving the targeted heat exchange.

[0066] The entire design achieves efficient heat dissipation while ensuring the airtightness of the enclosure 100 through the coordinated logic of internal inert gas circulation heat exchange and external air heat dissipation. It is suitable for the temperature control requirements in inert gas arc extinguishing scenarios, and at the same time, it ensures the reliability of heat dissipation through air volume monitoring. The structural layout is highly compatible with the installation space of the top box 102 and the enclosure 100.

[0067] Please refer to the above as well. Figures 1 to 12 In one specific embodiment of this application, the exhaust assembly 600 includes an exhaust pipe 601, which is fixedly and sealed on the side wall of the top box 102. The inner end of the exhaust pipe 601 is sealed and connected to the top box 102 and the interior of the housing 100. An electronically controlled exhaust valve 602 and a gas concentration sensor 603 are installed on the outer end of the exhaust pipe 601.

[0068] During operation, the exhaust assembly 600 serves as the core for ensuring the purity of the gas inside the housing 100 and the top box 102, maintaining the purity of the inert gas environment through gas monitoring.

[0069] During initial use or maintenance, the air inside the housing 100 and top box 102 needs to be discharged through the exhaust assembly 600. The gas concentration sensor 603 is installed at the outer end of the exhaust pipe 601 to detect the purity of the inert gas in the discharged gas in real time. If the detected inert gas concentration is lower than the design standard, the electrically controlled exhaust valve 602 is kept open. When the inert gas concentration reaches the design standard, the electrically controlled exhaust valve 602 is closed to ensure the purity of the inert gas and ensure the arc extinguishing effect.

[0070] The entire design effectively maintains the purity of the internal inert gas environment through the coordinated logic of gas purity monitoring and the opening and closing of the exhaust component 600, providing auxiliary protection for the stable operation of arc extinguishing and heat dissipation functions.

[0071] Please refer to the above as well. Figures 1 to 12 In one specific embodiment of this application, the cooling and heat dissipation assembly 700 includes a cooling cavity 701 opened inside the mounting base 106. An air guide 702 is slidably connected inside the cooling cavity 701. A piston cylinder 703 is fixedly and thermally connected inside the cooling cavity 701. A piston rod 704 is slidably connected inside the piston cylinder 703. The piston cylinder 703 is filled with a driving medium with thermal expansion and contraction characteristics. The outer end of the piston rod 704 is fixedly connected to the air guide 702. A plurality of cooling holes 705 communicating with the cooling cavity 701 are opened on the mounting base 106, and the cooling holes 705 are opened towards the electrical components.

[0072] During operation, the cooling component 700 serves as the core for precise heat dissipation of the mounting base 106. It adopts a passive design that combines thermal expansion and contraction with inert gas flow, which can specifically remove local high temperatures from electrical components.

[0073] When the electrical components on the mounting base 106 are working, they generate heat. This heat is conducted through the mounting base 106 to the piston cylinder 703 inside the cooling chamber 701. The driving medium inside the piston cylinder 703 expands in volume after being heated, generating thrust to push the piston rod 704 to slide along the piston cylinder 703. The piston rod 704 drives the air guide 702, which is fixedly connected to it, to move into the space behind the mounting plate 105 inside the housing 100. The air guide 702 then guides the cooling inert gas delivered by the circulating heat dissipation assembly 500 into the cooling chamber 701. The cooling inert gas inside the cooling chamber 701 is sprayed from the cooling holes 705 onto the electrical components, thereby carrying away the heat generated by the electrical components during operation. The amount of heat generated when the electrical components are working determines the sliding amount of the air guide 702, and the sliding amount of the air guide 702 determines the airflow rate into the cooling chamber 701. This allows the cooling inert gas to be adaptively guided into the mounting base 106 and onto the electrical components. After the inert gas absorbs the local high temperature, it is then circulated and cooled through the circulating heat dissipation assembly 500 to complete targeted heat exchange.

[0074] The entire design requires no additional electronic control drive. It achieves passive and precise heat dissipation through the thermal expansion and contraction of the driving medium. It is suitable for inert gas use in sealed environments and can also specifically solve the high temperature problem of local electrical components. It forms a synergistic effect of overall heat dissipation combined with local reinforcement with the circulating heat dissipation component 500. The structural layout is highly compatible with the space of the mounting base 106 and the installation requirements of electrical components.

[0075] Please refer to the above as well. Figures 1 to 12 In one specific embodiment of this application, the driving medium inside the piston cylinder 703 can be a paraffin-based composite medium or a low-melting-point alloy, or a thermally expanding silicone rubber. The preferred paraffin-based composite medium is 58# fully refined paraffin mixed with 15% expanded graphite. The low-melting-point alloy can be a bismuth-tin alloy Bi58Sn42. The thermally expanding silicone rubber can be modified with 30% hollow glass microspheres.

[0076] Among them, the melting point of 58# paraffin is about 58℃, which is highly matched with the normal operating temperature (45℃~60℃) of the electrical components in the distribution box. It is solid at room temperature, but melts into liquid quickly when heated and produces significant volume expansion (expansion rate of about 15%~20%). Furthermore, expanded graphite can be added to further improve the thermal conductivity, increasing the thermal conductivity from 0.2W / (m·K) to 0.8W / (m·K), enabling the medium to respond quickly to the temperature change of the piston cylinder 703 and reducing heat dissipation delay.

[0077] The bismuth-tin alloy Bi58Sn42 has a melting point of about 58℃, which is consistent with that of paraffin-based media. It has moderate hardness in the solid state and a volume expansion rate of about 3% to 5% after melting, which is lower than that of paraffin. However, it has a high density and the actual expansion thrust can reach 10 to 12 N. Its thermal conductivity is as high as 38 W / (m·K), and its temperature sensing sensitivity is far superior to that of paraffin, enabling it to respond quickly when the temperature of electrical components rises sharply.

[0078] The thermally expandable silicone uses room temperature vulcanizing silicone rubber as a base and adds 30% hollow glass microspheres. The particle size of the hollow glass microspheres is 50-100μm. At room temperature, it is an elastic solid. When heated, its volume gradually expands when the temperature reaches above 40℃. When it reaches 60℃, the expansion rate can reach 25%-30%. The thermal conductivity is about 0.35W / (m·K), and the temperature response speed is between that of paraffin and low melting point alloys.

[0079] Please refer to the above as well. Figures 1 to 12In one specific embodiment of this application, the sealing structure 104 includes a sealing ring 1041. A sealing ring mounting groove 1042 is provided on the front side of the box body 100 and the inner side of the cabinet door 103. The sealing ring 1041 is fixedly installed inside the sealing ring mounting groove 1042.

[0080] During operation, the sealing structure 104, as the core sealing component between the housing 100 and the cabinet door 103, uses the design of groove positioning and sealing ring fit to block the flow of gas and exchange of media inside and outside the housing, ensuring the airtightness of the internal inert gas environment.

[0081] Among them, the sealing ring mounting groove 1042 is respectively opened on the front side of the box 100 and the inner side of the cabinet door 103, forming a corresponding and fitting groove structure, providing a fixing and positioning space for the sealing ring 1041, preventing the sealing ring from shifting or falling off when the cabinet door 103 is opened and closed, and ensuring the accuracy of the sealing position.

[0082] When the cabinet door 103 is closed, the end face of the cabinet door 103 fits tightly against the box body 100, compressing the sealing ring 1041 installed in the sealing ring mounting groove 1042. After being compressed, the sealing ring 1041 undergoes elastic deformation, filling the tiny gap between the cabinet door 103 and the box body, forming a continuous sealing contact surface, completely blocking the internal inert gas leakage channel, and preventing external air, dust, moisture, etc. from entering the box body.

[0083] The entire design utilizes the classic sealing logic of positioning grooves and elastic sealing rings, resulting in a simple and reliable structure that efficiently achieves a tight seal between the cabinet door and the enclosure. This provides a basic sealing guarantee for the internal inert gas arc extinguishing and circulating heat dissipation functions, and it is also compatible with the rotating opening and closing structure of the cabinet door, without affecting the convenience of operation and maintenance.

[0084] Please refer to the above as well. Figures 1 to 12 In one specific embodiment of this application, the sealing ring 1041 is preferably made of EPDM rubber or fluororubber, which has excellent elasticity and aging resistance.

[0085] Please refer to the above as well. Figures 1 to 12 In one specific embodiment of this application, a controller is also included, which is electrically connected to the pressure sensor 304 in the gas storage component 300, the electrically controlled valve 404 in the valve component 400, the fan 506 and air volume sensor 508 in the circulating heat dissipation component 500, and the electrically controlled exhaust valve 602 and gas concentration sensor 603 in the exhaust component 600.

[0086] During operation, the controller, as the core control hub of the power distribution box, constructs a fully automated control closed loop through electrical connections with various component sensors and actuators. This loop encompasses signal acquisition, logic judgment, command execution, and status feedback, and coordinates the core functions of inert gas supply, heat dissipation regulation, and gas purity assurance, enabling collaborative operation among all components.

[0087] Among them, the pressure sensor 304 of the gas storage component 300 collects the pressure data of the inert gas in the gas storage tank 301 in real time and transmits it to the controller synchronously; the controller presets a gas replenishment threshold of 0.2MPa, dynamically compares the collected data, and reminds the staff to replenish gas when the pressure is lower than the gas replenishment threshold; The controller receives inert gas circulation airflow data from the airflow sensor 508 in the circulating heat dissipation component 500, and combines it with the heating logic of the electrical components. When the airflow is lower than the preset value, the controller automatically increases the speed of the fan 506 to increase the inert gas circulation flow and ensure the heat dissipation effect. When the airflow is higher than the preset value, the load decreases and the heat dissipation demand decreases. The controller can reduce the speed of the fan 506 to achieve energy-saving operation, while avoiding pressure fluctuations in the housing caused by excessively fast inert gas circulation.

[0088] When used for the first time or restarted after maintenance, the controller automatically starts the inert gas replacement mode: instructs the solenoid valve 404 to continuously replenish gas and the solenoid exhaust valve 602 to continuously exhaust gas until the gas concentration sensor 603 detects that the inert gas purity is ≥90%, then closes the solenoid exhaust valve 602 to complete the replacement and ensure the arc extinguishing effect.

[0089] The entire design integrates the originally independently operating gas storage component 300, valve component 400, circulating heat dissipation component 500, and exhaust component 600 into a coordinated and interconnected system through centralized and automated control of the controller. This not only ensures the stable and efficient operation of the inert gas arc extinguishing and circulating heat dissipation functions, but also improves the operational safety, maintenance convenience, and automation level of the distribution box, making it suitable for the intelligent needs of industrial and civil scenarios.

[0090] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A distribution box with circuit protection function, characterized in that: The enclosure includes a housing (100), a bottom box (101) fixedly and sealed at the bottom of the housing (100), a top box (102) fixedly and sealed at the top of the housing (100), a cabinet door (103) rotatably connected to the front of the housing (100), a sealing structure (104) provided at the fitting point between the cabinet door (103) and the housing (100), a mounting plate (105) fixedly and sealed near its rear side inside the housing (100), a plurality of mounting seats (106) for installing electrical components fixedly and sealed on the mounting plate (105), and symmetrically arranged conduits (107) fixedly installed on both sides of the bottom box (101); the housing (100) The bottom of the box is detachably and sealed with a wiring assembly (200). The bottom box (101) is equipped with a gas storage assembly (300) for storing inert gas. The gas storage assembly (300) is sealed with a valve assembly (400) that is sealed and communicates with the box body (100). The top box (102) is equipped with a circulating heat dissipation assembly (500) that is sealed and communicates with the inside of the box body (100). The side wall of the top box (102) is fixedly and sealed with an exhaust assembly (600). The exhaust assembly (600) is sealed and communicates with the circulating heat dissipation assembly (500). The mounting base (106) is equipped with a cooling and heat-reducing assembly (700) that communicates with the circulating heat dissipation assembly (500).

2. A distribution box with circuit protection function according to claim 1, characterized in that: The wiring assembly (200) includes a terminal block (201). A terminal block mounting groove (202) is provided on the bottom plate of the housing (100) corresponding to the terminal block (201). The terminal block (201) is detachably and sealed to the bottom plate of the housing (100) through the terminal block mounting groove (202). A plurality of conductive posts (203) passing through both ends of the terminal block (201) are fixedly and sealed on the terminal block (201). A wire mounting hole (204) is provided on the conductive post (203) near its two ends along its radial direction. A wire locking hole (205) passing through the wire mounting hole (204) is provided at both ends of the conductive post (203). A locking screw (206) is threaded inside the wire locking hole (205).

3. A distribution box with circuit protection function according to claim 1, characterized in that: The gas storage assembly (300) includes a gas storage tank (301), which is fixedly installed inside the base box (101). A first connecting pipe (302) and a second connecting pipe (303) are fixedly and sealed to the gas storage tank (301). A pressure sensor (304) is fixedly and sealed to the first connecting pipe (302), and the second connecting pipe (303) is sealed to the valve assembly (400).

4. A distribution box with circuit protection function according to claim 1, characterized in that: The valve assembly (400) includes a mounting box (401), which is fixedly embedded in the bottom plate of the housing (100). The front end of the mounting box (401) is provided with a clearance groove (402) corresponding to the cabinet door (103). The middle part of the mounting box (401) is fixedly and sealed with an air guide cylinder (403). The top of the air guide cylinder (403) penetrates the bottom plate of the housing (100) and is fixedly and sealed with an electric control valve (404). The bottom of the air guide cylinder (403) is sealed and connected to the gas storage assembly (300).

5. A distribution box with circuit protection function according to claim 4, characterized in that: The mounting box (401) is internally sealed and slidably connected to a sliding block (405). A valve stem (406) is fixedly connected to the rear end of the sliding block (405). A sliding hole (407) is opened in the middle of the air guide cylinder (403) corresponding to the valve stem (406). The valve stem (406) passes through the sliding hole (407) and is sealed and slidably connected to the air guide cylinder (403). A valve hole (408) is opened on the valve stem (406) corresponding to the air guide cylinder (403). A spring (409) is fixedly connected to the rear end of the valve stem (406). The spring (409) abuts against the inner end of the mounting box (401).

6. A distribution box with circuit protection function according to claim 1, characterized in that: The circulating heat dissipation assembly (500) includes a heat-conducting plate (501) fixedly and sealed to the middle of the top box (102). A first heat dissipation fin (502) is fixedly and thermally connected to the top surface of the heat-conducting plate (501), and a second heat dissipation fin (503) is fixedly and thermally connected to the bottom surface of the heat-conducting plate (501). An air outlet (504) is provided at the bottom of the top box (102) corresponding to the position inside the housing (100) in front of the mounting plate (105). An air return vent (505) is provided inside the housing (100) at the rear side of the mounting plate (105). A fan (506) is fixedly installed at the air outlet (504) corresponding to the second heat dissipation fin (503). An air return duct (507) is installed on the mounting plate (105) near its bottom. An air volume sensor (508) is installed on the air return duct (507). A symmetrically arranged ventilation opening (509) is provided on the side wall of the top box (102) corresponding to the first heat dissipation fin (502).

7. A distribution box with circuit protection function according to claim 1, characterized in that: The exhaust assembly (600) includes an exhaust pipe (601), which is fixedly and sealed on the side wall of the top box (102). The inner end of the exhaust pipe (601) is sealed and connected to the inside of the top box (102) and the housing (100). An electronically controlled exhaust valve (602) and a gas concentration sensor (603) are installed on the outer end of the exhaust pipe (601).

8. A distribution box with circuit protection function according to claim 1, characterized in that: The cooling and heat dissipation assembly (700) includes a cooling chamber (701) opened inside the mounting base (106), an air guide (702) is slidably connected inside the cooling chamber (701), a piston cylinder (703) is fixedly and thermally connected inside the cooling chamber (701), a piston rod (704) is slidably connected inside the piston cylinder (703), the piston cylinder (703) is filled with a driving medium with thermal expansion and contraction characteristics, and the outer end of the piston rod (704) is fixedly connected to the air guide (702); the mounting base (106) is provided with a plurality of cooling holes (705) communicating with the cooling chamber (701), and the cooling holes (705) are opened towards the electrical components.

9. A distribution box with circuit protection function according to claim 1, characterized in that: The sealing structure (104) includes a sealing ring (1041). The front side of the box (100) and the inner side of the cabinet door (103) are provided with sealing ring mounting grooves (1042). The sealing ring (1041) is fixedly installed inside the sealing ring mounting groove (1042).

10. A distribution box with circuit protection function according to claim 1, characterized in that: The inert gas used is nitrogen.

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