A compact ring main unit gas tank based on strong convection heat dissipation

Abstract

The application discloses a compact ring main unit gas tank based on strong convection heat dissipation and belongs to the technical field of ring main unit equipment. The application comprises a tank body, two heat dissipation flange plates and an intelligent water cooling circulation system, heat dissipation holes are formed in the top plate and the upper part of the back plate of the tank body, and the heat dissipation flange plates are sealingly assembled at the heat dissipation holes. The inner and outer sides of the heat dissipation flange plates are provided with cavity type heat dissipation reinforcing ribs with cooling liquid channels, the outer side heat dissipation reinforcing ribs are provided with cooling liquid medium circulation interfaces, and the cooling liquid medium circulation interfaces are in communication with the liquid cooling circulation pipelines of the intelligent water cooling circulation system at the back top part of the gas tank. The intelligent water cooling circulation system can collect the temperature of the heat dissipation flange plates in real time and start and stop the water cooling circulation in a self-adaptive mode. The application utilizes the characteristic that the heat conductivity of aluminum alloy is much higher than that of stainless steel to combine the intelligent water cooling system to quickly lead out the heat in the tank, so that a significant temperature difference is formed between the upper part and the lower part of the gas tank, the high-strength natural convection of the insulating gas in the tank is driven, and the heat accumulated in the main loop conductor is efficiently taken away.

Description

Technical Field

[0001] This invention relates to the field of ring main unit equipment technology, specifically to a compact ring main unit air box based on strong convection heat dissipation. Background Technology

[0002] Compact ring main units (RMMs) are widely used in medium-voltage power distribution scenarios such as urban power distribution networks, industrial parks, and residential communities due to their small size and compact structure. The gas chamber, as the core sealed cavity of the compact RMM, integrates key components that generate heat during operation, such as the main circuit conductors, disconnecting switches, and grounding switches. When the equipment is energized for extended periods, the main circuit conductors continuously generate Joule heat, causing the internal temperature of the gas chamber to rise steadily.

[0003] Most mainstream compact ring main unit gas boxes on the market are made of 304 stainless steel through integral welding, which provides excellent overall sealing. However, stainless steel itself has a low thermal conductivity and poor heat dissipation performance. At the same time, the temperature difference between the top and bottom of the gas box is extremely small, resulting in poor gas convection and circulation. Ultimately, this leads to the continuous accumulation of heat on the conductor surface during equipment operation, which cannot be effectively dissipated. If the equipment operates at high temperatures for a long time, it will accelerate the aging of internal insulation components and the oxidation of conductors. This will not only reduce the operational stability of the ring main unit but also shorten its service life. In severe cases, it may even cause electrical faults such as discharge and short circuits, making it impossible to meet the power distribution requirements of high load and long-term continuous operation.

[0004] Therefore, the industry urgently needs to design a compact ring main unit air box with a compact structure and excellent heat dissipation efficiency to solve the pain points of existing technologies. Summary of the Invention

[0005] This invention addresses the technical challenges of existing compact ring main unit (RNU) systems, such as current-carrying conductors in the main circuit generating heat during operation, poor heat dissipation conditions in the enclosed space, and difficulty in effectively controlling conductor temperature rise, which easily lead to decreased equipment operational stability and shortened service life. It provides a compact RNU air box based on strong convection cooling to solve the industry pain points of low heat dissipation efficiency, excessive temperature rise, bulky internal heat dissipation structure, and difficulty in balancing sealing and heat dissipation in compact insulating air boxes.

[0006] To achieve the above objectives, the present invention provides the following technical solution: In a first aspect, the present invention provides a compact ring main unit air box based on strong convection heat dissipation, including a main body of the box, a heat dissipation flange plate, and an intelligent water cooling circulation system; The upper part of the main body of the box is provided with heat dissipation holes, and the heat dissipation flange is correspondingly and sealed to the heat dissipation holes; The inner and outer sides of the heat dissipation flange are provided with integrally formed cavity-type heat dissipation reinforcing ribs. The cavity-type heat dissipation reinforcing ribs form a closed coolant circulation channel inside. The outer side of the heat dissipation flange is provided with a coolant circulation inlet and outlet interface that communicates with the coolant circulation channel. The cavity-type heat dissipation reinforcing rib penetrates the heat dissipation through hole and extends into the interior of the box body, so that the cavity-type heat dissipation reinforcing rib directly contacts the insulating gas inside the box body; The intelligent water-cooling circulation system is sealed and connected to the coolant circulation inlet and outlet interface through a liquid-cooling circulation pipe, and is used to force liquid cooling of the heat dissipation flange plate. The thermal conductivity of the heat dissipation flange is greater than that of the main body of the enclosure, which causes the temperature of the upper region inside the enclosure to be lower than that of the lower region, creating a temperature difference and driving the insulating gas inside the enclosure to form natural convection, thereby carrying away the heat accumulated in the main circuit conductor.

[0007] Furthermore, a sealing ring is provided between the heat dissipation flange plate and the main body of the housing. The inner side of the heat dissipation flange plate is provided with an installation groove that matches the sealing ring, and the sealing ring is embedded in the installation groove. Furthermore, the main body of the box is formed by welding together a front plate, a rear plate, a bottom plate, a top plate, a left side plate, and a right side plate.

[0008] Furthermore, the upper parts of the top plate and the rear plate are respectively provided with heat dissipation openings for the air box top plate and heat dissipation openings for the upper part of the air box rear plate; The heat dissipation flange includes a heat dissipation flange at the top of the air box and a heat dissipation flange at the rear top of the air box. The heat dissipation flange plate at the top of the air box and the heat dissipation flange plate at the rear top of the air box are respectively sealed and assembled at the heat dissipation openings at the top of the air box and the upper heat dissipation openings at the rear of the air box. Furthermore, the heat dissipation flange is made of aluminum alloy, and the main body of the enclosure is made of 304 stainless steel.

[0009] Furthermore, mounting screws are welded onto the outer side panel of the main body of the enclosure around the heat dissipation through-hole, and the heat dissipation flange is pressed and fixed to the main body of the enclosure by the mounting screws.

[0010] Furthermore, the intelligent water-cooled circulation system also includes a liquid storage tank, a cooling device, and a circulating water pump; The liquid storage tank is used to store circulating coolant, the circulating water pump is used to drive the coolant to circulate between the coolant circulation channel and the liquid cooling circulation pipe, and the cooling device is used to forcibly cool the high-temperature coolant after it absorbs heat. The coolant circulation channel, the liquid cooling circulation pipe, the cooling device, the liquid storage tank, and the circulating water pump are connected in sequence to form a closed-loop water cooling heat dissipation circuit.

[0011] Furthermore, the intelligent water-cooling circulation system is equipped with a microcomputer digital temperature controller, which is used to collect the temperature signal of the heat dissipation flange in real time and control the start and stop of the intelligent water-cooling circulation system. The microcomputer digital temperature controller supports custom settings for system start / stop temperature thresholds; When the temperature of the heat dissipation flange plate collected by the microcomputer digital temperature controller exceeds the set start-up temperature threshold, the microcomputer digital temperature controller simultaneously starts the cooling device and the circulating water pump; when the collected temperature is lower than the set stop-down temperature threshold, the microcomputer digital temperature controller shuts down the cooling device and the circulating water pump.

[0012] Furthermore, the front plate is an integral stepped curved plate structure, the front plate surface is provided with a dynamic sealing shaft mounting hole, the outer side plate surface of the front plate is welded with an operating mechanism mounting screw, and the inner side plate surface of the front plate is welded with a switch body mounting screw. The lower stepped surface of the front plate is provided with inlet and outlet sleeve mounting holes, and a U-shaped reinforcing bend plate is welded around the inlet and outlet sleeve mounting holes.

[0013] Both the left and right side plates are integral flat plate structures. The upper parts of the left and right side plates are respectively provided with busbar connector mounting holes, and U-shaped bent plates are welded around the busbar connector mounting holes.

[0014] Secondly, the present invention provides a heat dissipation method for a compact ring main unit air box based on strong convection heat dissipation, applied to the compact ring main unit air box described in the first aspect, comprising: The heat accumulated inside the main body of the box is absorbed by the heat dissipation flange made of high thermal conductivity aluminum alloy. The cavity-type heat dissipation reinforcing ribs that penetrate through the heat dissipation flange plate and extend into the main body of the box directly exchange heat with the insulating gas inside the main body of the box. The heat dissipation flange is subjected to forced liquid cooling by an intelligent water cooling circulation system, which creates a local low temperature zone in the top and rear top areas of the main body of the box, while creating a relatively high temperature zone in the lower and side areas of the main body of the box, thereby creating a stable temperature difference between the top and bottom of the box. Driven by the temperature difference between the top and bottom, the insulating gas inside the main body of the box generates natural convection from bottom to top. The high-temperature gas rises to the heat dissipation flange plate for heat exchange and cooling, and then sinks, circulating repeatedly to continuously remove the heat from the main circuit conductor.

[0015] Compared with the prior art, the present invention has the following advantages: 1. High composite heat dissipation efficiency and excellent control of current-carrying conductor temperature rise: This invention adopts a composite heat dissipation structure that combines a high thermal conductivity aluminum alloy heat dissipation flange plate, an intelligent water cooling circulation system, and strong convection due to temperature difference inside the box. The thermal conductivity of aluminum alloy far exceeds that of stainless steel boxes, which can quickly absorb and dissipate the heat accumulated inside the box. Combined with adaptive intelligent water cooling circulation to achieve forced heat exchange, and at the same time using the stable temperature difference inside the box to drive the insulating gas to form high-intensity natural convection, it completely solves the problems of sluggish heat dissipation, uneven heat dissipation, and excessive conductor temperature rise in traditional sealed air boxes, significantly reducing the operating temperature rise of the equipment and ensuring the long-term stable operation of the ring main unit.

[0016] 2. Highly integrated structure, compact and versatile equipment: This invention highly integrates IP67 sealing, liquid cooling heat exchange, airflow convection heat dissipation, and enclosure structural reinforcement into one unit. No additional fans, heat sinks, or other auxiliary heat dissipation components are needed inside the gas box, effectively reducing the overall volume of the gas box and adapting to the assembly requirements of compact ring main units. At the same time, the overall structural layout is reasonable, and the component installation points are neatly arranged, making it compatible with various specifications of compact ring main units with rated currents. The equipment has strong adaptability and practicality, and a wide range of applications.

[0017] 3. Intelligent temperature control operation, energy saving and fast response: This invention is equipped with a microcomputer digital temperature controller, which can monitor the flange temperature in real time and supports the adaptive start and stop of the water cooling circulation system based on a custom temperature threshold. Compared with the traditional continuous heat dissipation structure, it can intelligently start and stop according to the actual heat dissipation conditions of the equipment, effectively reducing the energy consumption of the equipment; at the same time, the water cooling circulation has a fast response speed, which can achieve cooling as soon as heat is generated, and the heat dissipation control is precise and sensitive, adapting to the heat dissipation requirements of the ring main unit under different load conditions.

[0018] 4. Reasonable material combination and excellent overall performance: The main body of the enclosure is made of 304 stainless steel plate welded together, which has the advantages of high strength, corrosion resistance and high airtightness, and is suitable for outdoor and complex working conditions; the core heat dissipation components are made of high-strength aluminum alloy, which takes into account both high thermal conductivity and heat dissipation performance and structural explosion-proof strength. Combined with the integrated cavity-type reinforcing rib structure, it not only expands the heat dissipation and heat exchange area, but also improves the impact resistance and deformation resistance of the flange plate. It takes into account both heat dissipation performance and equipment structural safety. The overall performance is far superior to the traditional single stainless steel heat dissipation box structure. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a cross-sectional view of the aluminum alloy heat dissipation flange plate with sealing rubber ring of the present invention; Figure 3 This is a schematic diagram of the intelligent water-cooling circulation system of the present invention; Figure 4This is a schematic diagram showing the openings, nails, and reinforcements of the top plate, rear plate, and left and right side plates of the main body of the air box of the present invention. Figure 5 This is a schematic diagram showing the fit between the main body of the air box, the heat dissipation flange plate, and the sealing ring of the present invention; Figure 6 A schematic diagram showing the openings, nails, and reinforcements on the front panel of the main body of the air box; Figure 7 This is a schematic diagram of the gas convection flow direction inside the gas box of the present invention.

[0020] The components include: 1. Air box body; 2. Air box top heat dissipation flange; 3. Air box rear top heat dissipation flange. 4. Intelligent water-cooled circulation system; 5. Flange sealing ring; 6. Flange heat dissipation reinforcing rib; 7. Internal cavity of heat dissipation reinforcing rib; 8. Coolant circulation inlet / outlet interface on flange; 9. Liquid storage tank; 10. Cooling device; 11. Circulating water pump; 12. Microcomputer digital temperature controller; 13. Liquid-cooled circulation pipeline; 14. Screws for welding on the top plate of the gas box; 15. Heat dissipation opening on the top plate of the gas box; 16. Screws for welding on the rear plate of the gas box; 17. Heat dissipation opening at the top of the rear plate of the gas box; 18. Top plate of the gas box; 19. Rear plate of the gas box; 20. Front plate of the gas box; 21. Left side plate of the gas box; 22. Right side plate of the gas box; 23. Bottom plate of the gas box; 24. Dynamic seal shaft mounting hole; 25. Inlet / outlet sleeve mounting opening; 26. U-shaped bend plate of the front plate of the gas box; 27. Busbar connector mounting opening of the side plate of the gas box; 28. U-shaped bend plate of the side plate of the gas box. Detailed Implementation

[0021] The technical solution of the present invention will be fully and clearly described below with reference to the embodiments and accompanying drawings. The following embodiments are only used to illustrate the technical solution of the present invention and are not intended to limit the scope of protection of the present invention. Example 1

[0022] This embodiment provides a compact ring main unit air box based on strong convection heat dissipation, including a main body 1 formed by welding together a front plate 20, a rear plate 19, a bottom plate 23, a top plate 18, a left side plate 21, and a right side plate 22, as well as two heat dissipation flange plates.

[0023] The main body 1 of the enclosure is constructed entirely of 304 stainless steel sheet, exhibiting high structural strength and excellent airtightness. The upper portions of the top plate 18 and the rear plate 19 are respectively provided with heat dissipation through-holes. The heat dissipation flange is made of high thermal conductivity aluminum alloy, with a thermal conductivity approximately 13 times that of 304 stainless steel sheet, providing excellent heat transfer capabilities. The heat dissipation flange is correspondingly and sealingly fitted at the heat dissipation through-holes 15 on the top plate 18 and 17 on the upper part of the rear plate 19. Both the inner and outer sides of the heat dissipation flange are provided with integrally formed cavity-type heat dissipation reinforcing ribs 6. The interior of the cavity-type heat dissipation reinforcing ribs 6 forms a closed coolant circulation channel 7, and the outer side of the heat dissipation flange has coolant circulation inlet / outlet interfaces 8 that communicate with the coolant circulation channel 7. The cavity-type heat dissipation reinforcing ribs 6 penetrate the heat dissipation through-holes and extend into the interior of the main body 1, directly contacting the insulating gas inside the main body 1.

[0024] Implementation principle: During normal operation, the main circuit conductor inside the main body 1 continuously generates Joule heat, which accumulates in the upper part of the chamber. Because the thermal conductivity of the aluminum alloy heat dissipation flange is much higher than that of the 304 stainless steel main body 1, the heat dissipation flanges located on the top plate 18 and rear plate 19 can quickly absorb and dissipate the heat accumulated in the upper part of the chamber, creating a localized low-temperature zone at the top and rear top of the chamber. Meanwhile, the heat dissipation is slower in the side walls, lower part, and areas around the conductors, resulting in a relatively higher temperature. Thus, a stable and significant temperature gradient is formed inside the main body 1. Based on the principle of temperature and pressure difference, this temperature difference drives the insulating gas inside the main body 1 to form a continuous and stable natural strong convection: the high-temperature gas inside the chamber flows upward, exchanges heat with the aluminum alloy cavity-type heat dissipation reinforcement ribs 6 extending into the chamber, and cools down. The cooled gas naturally sinks, and this cycle repeats continuously, carrying away the heat accumulated in the main circuit conductor.

[0025] Based on the different thermal conductivity characteristics of materials, this embodiment utilizes the temperature difference inside the box to drive natural gas convection, effectively solving the technical defects of traditional sealed stainless steel air boxes such as lagging heat dissipation and excessive conductor temperature rise without the need for additional forced heat dissipation components such as fans. Example 2

[0026] like Figures 1 to 7 As shown, the present invention discloses a compact ring main unit air box based on strong convection heat dissipation, which mainly consists of an air box body 1, a heat dissipation flange plate 2 at the top of the air box, a heat dissipation flange plate 3 at the rear top of the air box, and an intelligent water cooling circulation system 4.

[0027] The main body of the air box 1 adopts a six-sided welded integrated structure consisting of a top plate 18, a rear plate 19, a front plate 20, a left side plate 21, a right side plate 22, and a bottom plate 23. The weld seams of the box are continuously sealed, with no leakage gaps, ensuring the overall airtightness of the air box from a structural perspective.

[0028] All plates of the main body 1 of the gas box are made of 304 stainless steel with a thickness of 3.0mm. This material has excellent corrosion resistance, mechanical strength and structural stability, and can be adapted to the complex operating environment of power distribution equipment. It can effectively resist changes in ambient temperature and humidity, surface condensation and slight acid and alkali corrosion. It is not easy to deform or rust after long-term use, and its airtightness is stable and can meet the reliability requirements of long-term continuous operation of high-voltage electrical equipment.

[0029] like Figure 5 As shown, the top heat dissipation flange 2 and the rear top heat dissipation flange 3 of the gas box are both made of high-strength aluminum alloy. The thermal conductivity of aluminum alloy is approximately 13 times that of 304 stainless steel, giving it excellent rapid heat conduction and dissipation performance. It is the core heat-conducting component for achieving efficient heat dissipation in this device. The two heat dissipation flanges are respectively installed at the top heat dissipation opening 15 on the top plate 18 of the gas box and the upper rear heat dissipation opening 17 on the upper part of the rear plate 19 of the gas box. During assembly, matching flange sealing rings 5 ​​are placed, and then the flanges are locked and fixed by welding screws 14 on the top plate and welding screws 16 on the rear plate of the gas box. The compression-type sealing assembly structure can completely seal the assembly gap, ensuring that the overall protection level of the gas box stably reaches the IP67 standard.

[0030] like Figure 2 As shown, the top heat dissipation flange 2 and the rear top heat dissipation flange 3 are equipped with integrally formed cavity-type heat dissipation reinforcing ribs 6. The heat dissipation reinforcing ribs have internal heat dissipation reinforcing rib cavities 7, forming a closed coolant flow channel. Coolant circulation inlet and outlet ports 8 are located on the outer side of the flanges. The heat dissipation reinforcing ribs 6 on the inner side of the flanges extend into the gas box through the heat dissipation openings 15 and 17, directly contacting the sealed insulating gas inside the box, significantly increasing the internal heat absorption contact area and the external heat dissipation exchange area. Utilizing the high thermal conductivity of aluminum alloy, combined with the forced cooling effect of the intelligent water-cooling circulation system 4, the heat accumulated on the flanges can be quickly removed, making the temperature around the flanges significantly lower than the rest of the gas box, thus forming a stable temperature gradient within the box and providing a power source for strong gas convection circulation.

[0031] like Figure 3As shown, the intelligent water-cooled circulation system 4 is sealed to the coolant circulation inlet / outlet ports 8 on the top heat dissipation flange 2 and the rear top heat dissipation flange 3 of the air box via a liquid-cooled circulation pipe 13. It is equipped with a liquid storage tank 9, a cooling device 10, a circulating water pump 11, and a microcomputer digital temperature controller 12. The liquid storage tank 9 stores the circulating coolant. The microcomputer digital temperature controller 12 collects real-time temperature data from the top heat dissipation flange 2 and the rear top heat dissipation flange 3 of the air box and supports custom setting of system start / stop temperature thresholds, enabling intelligent monitoring and adaptive temperature control of the equipment. The circulating water pump 11 provides power for the circulation of the coolant. The cooling device 10 is used for forced air cooling of the high-temperature coolant after heat absorption, ensuring that the circulating coolant remains in a low-temperature heat exchange state.

[0032] The closed-loop circulation path of the intelligent water-cooling circulation system 4 is as follows: When the temperature collected by the microcomputer digital temperature controller 12 exceeds the set threshold, the cooling device 10 and the circulating water pump 11 are immediately and synchronously started to initiate liquid cooling circulation. High-temperature coolant flows from the inner cavity 7 of the flange plate through the liquid cooling circulation pipe 13 to the cooling device 10 for cooling. After cooling, the coolant flows through the liquid cooling circulation pipe 13 into the liquid storage tank 9 for temporary storage. Then, driven by the circulating water pump 11, the coolant flows back to the inner cavity 7 of the flange plate through the liquid cooling circulation pipe 13, thus completing the closed-loop circulation. When the real-time collected temperature is lower than the set threshold of the microcomputer digital temperature controller 12, the intelligent water-cooling circulation system automatically shuts down.

[0033] like Figure 6 As shown, the front panel 20 of the air box adopts a stepped structure formed by integral bending, and the panel has a dynamic seal shaft mounting hole 24. The outer side of the front panel is welded with operating mechanism mounting screws for fixing the external operating mechanism, and the inner side is welded with switch body mounting screws, which can realize the precise positioning and stable assembly of the internal primary switch components. The lower stepped surface of the front panel has an inlet / outlet sleeve mounting hole 25. To solve the problem of weak structure and easy deformation and air leakage at the opening location, a U-shaped bend plate 26 of the front panel of the air box is welded around the opening for local reinforcement, which can effectively resist the vibration generated by long-term operation of the equipment and avoid problems such as panel deformation, sealing failure, and decreased air tightness.

[0034] like Figure 4 As shown, the left side plate 21 and right side plate 22 of the gas box are integral stainless steel flat plate structures. The upper part of the two side plates are symmetrically provided with gas box side plate busbar connector mounting holes 27 to meet the needs of component assembly and inter-cabinet docking. For the weak areas at the openings of the side plates, U-shaped bends 28 are welded to the gas box side plates for reinforcement, which effectively improves the overall mechanical strength and structural rigidity of the side plates, avoids plate deformation, weld cracking and other failures during equipment transportation, installation and long-term operation vibration, and continuously ensures the overall sealing performance and operational stability of the gas box.

[0035] Combination Figure 7 The core heat dissipation principle of this device is explained as follows: The top and rear top of the gas box are equipped with high thermal conductivity aluminum alloy top heat dissipation flange 2 and rear top heat dissipation flange 3. Combined with the powerful cooling function of the intelligent water cooling system 4, the heat dissipation capacity is far superior to that of the stainless steel gas box body 1. During equipment operation, the conductors inside the gas box continuously generate heat, resulting in higher temperatures in the middle and lower parts of the box. Meanwhile, the top and rear top areas rapidly dissipate heat through the aluminum alloy flanges, creating a low-temperature zone. This forms a stable temperature gradient within the box, with higher temperatures at the bottom and lower temperatures at the top. Driven by this temperature difference, the sealed gas inside the gas box forms a continuous and stable natural strong convection: the high-temperature airflow rises, exchanges heat with the two heat dissipation flanges, and cools down. The cooled airflow then naturally sinks, and this cycle repeats continuously, carrying away the working heat of the conductors. This effectively solves the technical defects of traditional compact ring main unit gas boxes, such as poor heat dissipation, excessive conductor temperature rise, and heat accumulation.

[0036] The intelligent water-cooling system 4 provides forced liquid cooling to the top heat dissipation flange 2 and the rear top heat dissipation flange 3 of the air box. Utilizing the high thermal conductivity of aluminum alloy combined with the forced cooling effect of water, it quickly removes the heat accumulated on the flanges. The microcomputer digital temperature controller 12 monitors the flange temperature in real time and adaptively starts and stops the water-cooling cycle. Compared to traditional continuous heat dissipation structures, it can intelligently start and stop according to the actual heat generation conditions of the equipment, effectively reducing energy consumption. Simultaneously, the water-cooling cycle has a fast response speed, enabling immediate cooling upon heat generation, and precise and sensitive heat dissipation control.

[0037] The internal temperature difference drives strong convection. Due to the combined effect of rapid heat conduction from the aluminum alloy flanges and forced heat exchange via water cooling, a significant low-temperature zone forms in the upper part of the chamber, while the middle and lower parts remain at higher temperatures due to continuous heat generation from the conductors. This creates a stable temperature gradient within the chamber, with higher temperatures at the bottom and lower temperatures at the top. Driven by this temperature difference, the sealed gas inside the chamber experiences continuous and stable natural strong convection: the high-temperature airflow rises, exchanges heat with the two heat dissipation flanges, and cools down; the cooled airflow then naturally sinks, creating a continuous cycle that carries away the working heat from the conductors.

[0038] This embodiment features a compact overall structure and convenient assembly. It does not require additional forced heat dissipation components such as fans. Relying on the differentiated thermal conductivity of materials and the integration of an intelligent water cooling system, it achieves natural strong convection heat dissipation inside the air box from a structural perspective. At the same time, it maintains a high airtightness protection level of IP67 throughout the process, and has good heat dissipation performance, insulation performance and structural stability, which fully meets the requirements for long-term safe operation of compact ring main units.

[0039] In this embodiment, 304 stainless steel with a thickness of 3.0 mm is selected. In other embodiments, other thicknesses (such as 2.5 mm or 4.0 mm) or other grades of stainless steel (such as 316L) can also be selected, as long as the requirements for structural strength, corrosion resistance and airtightness are met.

[0040] The specific type of coolant is not limited in the embodiments. In other embodiments, pure water, ethylene glycol aqueous solution or other special coolants may be selected according to the ambient temperature conditions.

[0041] In this embodiment, high-strength aluminum alloy is selected. In other embodiments, other metal materials with high thermal conductivity (such as copper alloy) can also be selected, as long as their thermal conductivity is significantly higher than that of stainless steel housing.

[0042] In this embodiment, the temperature threshold is set by the user and can be flexibly adjusted according to the rated current of the device, the ambient temperature and the load characteristics in different application scenarios. The specific threshold value does not constitute a limitation of the present invention.

[0043] In this embodiment, a U-shaped bent plate is used to reinforce the opening area. In other embodiments, an L-shaped bent plate, a rectangular bent plate, or other cross-sectional shapes with equivalent reinforcing effect can also be used. Example 3

[0044] This embodiment provides a heat dissipation method for a compact ring main unit air box based on strong convection heat dissipation, applied to the compact ring main unit air box described in Embodiment 2, including: The heat accumulated inside the main body of the box 1 is absorbed by the heat dissipation flange made of high thermal conductivity aluminum alloy. The cavity-type heat dissipation reinforcing rib 6, which extends through the heat dissipation flange plate into the main body 1 of the box, directly exchanges heat with the insulating gas inside the main body 1 of the box. The intelligent water cooling circulation system 4 is used to force liquid cooling of the heat dissipation flange plate, so that the top and rear top areas of the main body 1 of the box form a local low temperature zone, while the lower and side areas of the main body 1 of the box form a relatively high temperature zone, thereby forming a stable temperature difference between the top and bottom inside the main body 1 of the box. Driven by the temperature difference between the top and bottom, the insulating gas inside the main body 1 of the box generates natural convection from bottom to top. The high-temperature gas rises to the heat dissipation flange plate for heat exchange and cooling, and then sinks, circulating repeatedly to continuously remove the heat from the main circuit conductor.

[0045] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature, and in the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0046] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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 of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0047] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0048] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0049] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.

Claims

1. A compact ring main unit air box based on strong convection heat dissipation, comprising a main body (1), characterized in that, It also includes heat dissipation flanges and intelligent water cooling circulation system (4); The upper part of the main body (1) of the box is provided with heat dissipation through holes, and the heat dissipation flange is correspondingly and sealed to the heat dissipation through holes; The inner and outer sides of the heat dissipation flange are provided with integrally formed cavity heat dissipation reinforcing ribs (6). The cavity heat dissipation reinforcing ribs (6) form a closed coolant circulation channel (7) inside. The outer side of the heat dissipation flange is provided with a coolant circulation inlet and outlet interface (8) that communicates with the coolant circulation channel (7). The cavity-type heat dissipation reinforcing rib (6) penetrates the heat dissipation through hole and extends into the interior of the box body (1), so that the cavity-type heat dissipation reinforcing rib (6) directly contacts the insulating gas inside the box body (1); The intelligent water cooling circulation system (4) is sealed and connected to the coolant circulation inlet and outlet interface (8) through the liquid cooling circulation pipe (13) for forced liquid cooling of the heat dissipation flange plate; The thermal conductivity of the heat dissipation flange is greater than that of the main body of the box (1), so that the temperature of the upper region inside the main body of the box (1) is lower than that of the lower region, forming a temperature difference and driving the insulating gas inside the main body of the box (1) to form natural convection, so as to remove the heat accumulated in the main circuit conductor.

2. The compact ring main unit air box based on strong convection heat dissipation according to claim 1, characterized in that, A sealing ring (5) is provided between the heat dissipation flange and the main body of the box. The inner side of the heat dissipation flange is provided with an installation groove that matches the sealing ring (5), and the sealing ring (5) is embedded in the installation groove.

3. The compact ring main unit air box based on strong convection heat dissipation according to claim 1, characterized in that, The main body (1) of the box is formed by welding together the front plate (20), the rear plate (19), the bottom plate (23), the top plate (18), the left side plate (21), and the right side plate (22).

4. The compact ring main unit air box based on strong convection heat dissipation according to claim 3, characterized in that, The upper parts of the top plate (18) and the rear plate (19) are respectively provided with heat dissipation openings (15) on the top plate of the air box and heat dissipation openings (17) on the upper part of the rear plate of the air box. The heat dissipation flange includes a heat dissipation flange (2) at the top of the air box and a heat dissipation flange (3) at the rear top of the air box. The heat dissipation flange plate (2) at the top of the air box and the heat dissipation flange plate (3) at the rear top of the air box are respectively sealed and assembled at the heat dissipation opening (15) on the top plate of the air box and the heat dissipation opening (17) at the upper part of the rear plate of the air box.

5. The compact ring main unit air box based on strong convection heat dissipation according to claim 1, characterized in that, The heat dissipation flange is made of aluminum alloy, and the body of the box (1) is made of 304 stainless steel plate.

6. The compact ring main unit air box based on strong convection heat dissipation according to claim 1, characterized in that, Mounting screws are welded onto the outer side plate of the main body (1) around the heat dissipation through hole, and the heat dissipation flange is pressed and fixed onto the main body (1) by the mounting screws.

7. The compact ring main unit air box based on strong convection heat dissipation according to claim 1, characterized in that, The intelligent water-cooled circulation system (4) also includes a liquid storage tank (9), a cooling device (10), and a circulating water pump (11). The liquid storage tank (9) is used to store circulating coolant, the circulating water pump (11) is used to drive the coolant to circulate between the coolant circulation channel (7) and the liquid cooling circulation pipe (13), and the cooling device (10) is used to force the high-temperature coolant after heat absorption to cool down. The coolant circulation channel (7), the liquid cooling circulation pipe (13), the cooling device (10), the liquid storage tank (9), and the circulating water pump (11) are connected in sequence to form a closed-loop water cooling heat dissipation circuit.

8. The compact ring main unit air box based on strong convection heat dissipation according to claim 7, characterized in that, The intelligent water cooling circulation system (4) is equipped with a microcomputer digital temperature controller (12), which is used to collect the temperature signal of the heat dissipation flange (2, 3) in real time and control the start and stop of the intelligent water cooling circulation system (4). The microcomputer digital temperature controller (12) supports custom setting of system start and stop temperature thresholds; When the temperature of the heat dissipation flange plate collected by the microcomputer digital temperature controller (12) exceeds the set start-up temperature threshold, the microcomputer digital temperature controller (12) simultaneously starts the cooling device (10) and the circulating water pump (11); when the collected temperature is lower than the set stop temperature threshold, the microcomputer digital temperature controller (12) shuts down the cooling device (10) and the circulating water pump (11).

9. The compact ring main unit air box based on strong convection heat dissipation according to claim 3, characterized in that, The front plate (20) is an integral stepped curved plate structure. The front plate (20) has a dynamic sealing shaft mounting hole (24) on its surface. The operating mechanism mounting screw is welded on the outer side of the front plate (20), and the switch body mounting screw is welded on the inner side of the front plate (20). The lower stepped surface of the front plate (20) is provided with inlet and outlet sleeve mounting holes (25), and a U-shaped reinforcing bend plate (26) is welded around the inlet and outlet sleeve mounting holes (25). The left side plate (21) and the right side plate (22) are both integral flat plate structures. The upper part of the left side plate (21) and the right side plate (22) are respectively provided with bus connector mounting holes (27). The area around the bus connector mounting holes (27) is welded with U-shaped bent plates (28).

10. A heat dissipation method for a compact ring main unit air box based on strong convection heat dissipation, characterized in that, The compact ring main unit gas box according to any one of claims 1-9 comprises: The heat accumulated inside the main body of the box (1) is absorbed by the heat dissipation flange made of high thermal conductivity aluminum alloy. The cavity-type heat dissipation reinforcing rib (6) that penetrates through the heat dissipation flange plate and extends into the body of the box (1) directly exchanges heat with the insulating gas inside the body of the box (1). The heat dissipation flange is subjected to forced liquid cooling by the intelligent water cooling circulation system (4), so that the top and rear top areas of the main body of the box (1) form a local low temperature zone, while the lower and side areas of the main body of the box (1) form a relatively high temperature zone, thereby forming a stable temperature difference between the top and bottom inside the main body of the box (1). Driven by the temperature difference between the top and bottom, the insulating gas inside the main body of the box (1) generates natural convection from bottom to top. The high-temperature gas rises to the heat dissipation flange plate for heat exchange and cooling, and then sinks down. This cycle repeats to continuously remove the heat from the main circuit conductor.

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