Primary and secondary fusion ring main unit

Abstract

The invention discloses a primary and secondary fusion ring main unit, relates to the technical field of ring main units, and aims to solve the technical problem that a switch contact is lack of derivative arc blocking capability. According to the invention, through a triple cooperative structure of grid sheet segmentation, gas cooling and physical plugging, the arc is efficiently extinguished, the derived arc is blocked, and the problem of secondary discharge in a severe environment is solved; the paraffin phase-change material is used for storing and releasing heat, the temperature of the inner wall is stably maintained, an electrolyte film is prevented from being formed through condensation, and the insulation performance is guaranteed; the isolation structure is driven by the shape memory alloy, is normally sealed, is opened during arc and is closed after being extinguished, and harmful gas is exhausted by matching with a one-way valve; the linkage ventilation system replaces residual harmful gas with dry gas, dilutes conductive particles and reduces humidity, the four functions cooperatively exert power, and the operation stability and safety of the ring main unit under complex working conditions are greatly improved from multi-dimensional protection of arc extinguishing, condensation prevention, harmful gas isolation and residue removal.

Description

Technical Field

[0001] This invention relates to the field of ring network box technology, and more specifically, to a primary and secondary integrated ring network box. Background Technology

[0002] In 10-24kV distribution network systems, integrated primary and secondary ring main units (RMMs) are core equipment for line control and fault isolation, widely used in urban distribution networks, industrial parks, and various outdoor scenarios. The reliable arc-extinguishing capability of their switching components (circuit breakers and load switches) directly determines the operational safety of the distribution network. If the arc generated by switch disconnection is not effectively controlled, it can easily cause equipment damage, escalate faults, and even threaten the safety of maintenance personnel. Currently, mainstream RMM switch bodies integrate vacuum or SF6 gas arc-extinguishing chambers, which can automatically extinguish arcs from load currents and small short-circuit currents at temperatures ranging from 2000 to 5000℃. The response is rapid and requires no manual intervention, meeting the basic requirements of conventional environments such as urban indoor and dry outdoor environments.

[0003] In actual power distribution network operation, arcs at temperatures between 2000 and 5000°C are considered high-frequency conditions, mainly occurring in two scenarios: first, when circuit breakers / load switches interrupt rated load currents of 630A to 1250A (routine high-frequency operation); and second, when interrupting small-capacity short-circuit currents of 3 to 5kA (downstream small-scale faults). Although the energy of these arcs is lower than that of extreme short-circuit arcs, existing arc-extinguishing methods have significant limitations and cannot fully cover the hazards.

[0004] First, existing arc extinguishing systems only provide point-to-point protection for switch contacts, lacking the ability to prevent secondary arcs. Metal vapor generated during switch disconnection can easily diffuse, causing gap discharges, or splash onto busbar connections, forming localized arcs. Especially in harsh coastal environments with salt spray, high humidity, and dust, salt spray and condensation form an electrolyte film on the surface of insulation components, and the adhesion of metal vapor can easily trigger secondary discharges; in dusty environments, arcs can also ignite dust, posing a risk of combustion and explosion. Maintenance data shows that unprotected ring main units in coastal areas frequently experience insulation carbonization and busbar creepage faults. Second, the long-term cumulative hazards of high-frequency arcs are difficult to avoid. For the switch body, the high temperature of the electric arc can cause contact erosion, contamination of the arc-extinguishing chamber, shorten contact life, increase the probability of arc reignition, and may also cause the operating mechanism to jam. For surrounding components, the heat radiation from the arc and metal particles can burn insulation components, exacerbate busbar joint discharge, and interfere with the operation of secondary components such as DTUs and sensors. For distribution network operation, incomplete arc suppression can easily lead to disconnection failure, fault expansion, and even "false tripping" of the switch, posing safety hazards. Existing arc extinguishing methods can only meet the basic requirements of conventional environments and cannot solve the problem of derivative arcs in harsh environments. In view of this, we propose a primary and secondary integrated ring main unit. Summary of the Invention

[0005] The purpose of this invention is to provide a primary and secondary integrated ring main unit to solve the technical problem that the switch contacts lack the ability to block derived electric arcs.

[0006] To solve the above technical problems, the present invention provides the following technical solution: a primary and secondary integrated ring network box, including a ring network box body, a primary and secondary equipment group is arranged inside the ring network box body, a control switch is arranged on the primary and secondary equipment group, and a plurality of switch doors are rotatably connected to one side of the ring network box body, and a fixed lock is installed on the switch doors; An insulating base is fixed on the inner side of the switch door near the control switch. An insulating jacket is fixed on one side of the insulating base. Both the insulating jacket and the insulating base are made of insulating material. A concave annular groove is opened on one side of the insulating jacket. A rubber sealing ring is bonded to the annular groove. When the switch door is closed, the rubber sealing ring is in close contact with the outer periphery of the control switch. The inner circumference of the insulating jacket is provided with an arc-extinguishing structure, which includes a ceramic ring with multiple through holes. A metal grid ring is connected to the outer circumference of the ceramic ring. The gaps between the grid plates of the metal grid ring are filled with an insulating arc-extinguishing plate. The insulating arc-extinguishing plate is made of an intumescent arc-extinguishing material. When triggered by the high temperature of the electric arc, the insulating arc-extinguishing plate can expand instantly and release arc-extinguishing gas. An exhaust pipe is connected between the bottom of the outer circumference of the insulating base and the exhaust groove of the ring network box.

[0007] Preferably, the metal grid ring is composed of a grid ring shell and a grid outer cover, and an insulation space is provided between the grid ring shell and the grid outer cover, the insulation space being filled with a phase change material.

[0008] Preferably, a one-way valve is fixed at the center of one end of the insulating jacket near the rubber sealing ring, a fixing frame is fixed on the outer periphery of the one-way valve, the fixing frame is provided with multiple partitions, and multiple isolation structures are provided at one end of the insulating jacket.

[0009] Preferably, the isolation structure includes an isolation plate with the same size as the partition opening, and an elastic sealing strip is fixed to the outer peripheral edge of the isolation plate; the isolation plate has a fan-shaped arc structure, and multiple isolation driving components are fixed to the outer arc edge of the isolation plate; a deformation cavity is opened at one end of the electrical insulation jacket, and a pressure-bearing surface is provided on the deformation cavity.

[0010] Preferably, the isolation drive component includes a rigid connecting plate fixed to the isolation plate, the rigid connecting plate being rotatably connected to the insulating jacket, a bending arc plate being fixed on one side of the rigid connecting plate, the outer periphery of the bending arc plate being in contact with the inner wall of the deformation cavity, one end of the bending arc plate being in contact with the pressure surface, and the isolation plate and the bending arc plate being made of deformable shape memory alloy.

[0011] Preferably, one end of the insulating jacket is provided with a compressed air chamber, and the compressed air chamber is provided with an air exchange structure.

[0012] Preferably, the ventilation structure includes a pressure ring, which is an annular plate structure. The pressure ring slides and limits the air pressure chamber. Two soft rubber layers are connected between one side of the pressure ring and the air pressure chamber, and an air storage space is formed between the pressure ring and the two soft rubber layers. A spring is connected between the pressure ring and the air pressure chamber.

[0013] Preferably, the gas storage space is connected to an exhaust pipe that penetrates the insulating jacket and connects the inner wall space between the rubber sealing ring and the fixing frame. The gas storage space is also connected to an air inlet pipe, which is composed of a corrugated folded pipe and a rigid pipe. Both the air inlet pipe and the exhaust pipe are equipped with one-way valves.

[0014] Preferably, one end of the pressure ring is provided with a rounded chamfer to facilitate extrusion, and an extrusion member is provided above one end of the pressure ring. The extrusion member consists of a driving section and a stabilizing section. The driving section has an arc-shaped structure with a gradually increasing diameter centered on the rotation point of the rigid connecting plate, and the stabilizing section is an arc-shaped structure with the same distance from the rotation point of the rigid connecting plate.

[0015] Preferably, the insulating jacket is detachably fixed with a disassembly ring at the rotation point of the rigid connecting plate.

[0016] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention employs a triple arc-extinguishing structure of "grid segmentation + gas cooling + physical sealing". When the control switch breaks and generates an arc, the metal grid ring first segments the arc into short arcs, reducing energy stability. The isolation arc-extinguishing plate (zinc borate-mica composite medium) is triggered by high temperature, releasing arc-extinguishing gas to cool the arc. At the same time, its volume expands three to five times, sealing the gaps between the grid plates and the gaps in the outer jacket, physically blocking the arc channel and air replenishment. Combined with the closed space constructed by the insulating outer jacket and the rubber sealing ring, the arc can be completely extinguished, avoiding secondary discharge caused by the diffusion of metal vapor. This effectively solves faults such as carbonization of insulation components and busbar creepage in coastal salt spray and high humidity environments.

[0017] 2. This invention also fills the metal grid ring with paraffin phase change material. The high temperature of the electric arc is quickly conducted to the insulation space through the grid plate. The paraffin gradually melts from solid to liquid, absorbing and storing a large amount of residual heat. After the electric arc is extinguished, the paraffin cools and solidifies, releasing heat. This keeps the temperature of the metal grid ring and the inner wall of the insulating jacket stable at a temperature higher than the ambient dew point. This design effectively inhibits the formation of condensate and prevents water droplets from combining with metal vapor and salt to form an electrolyte film. This ensures the insulation reliability of the ring main unit in harsh environments such as high humidity and salt spray, and extends the service life of the equipment.

[0018] 3. This invention also utilizes a shape memory alloy-driven isolation structure. Under normal conditions, the isolation plate and the fixed frame are sealed together, preventing gas from contacting the area surrounding the control switch. When an electric arc is generated, the high temperature triggers the millisecond-level deformation of the bending arc plate (high-temperature nickel-titanium-niobium alloy), causing the isolation plate to rotate open rapidly, providing a smooth passage for the electric arc and the arc-extinguishing gas. After the arc is extinguished, the alloy elastically recovers, causing the isolation plate to close and seal. Combined with a one-way valve, harmful gases are discharged, completely blocking residual gas from contacting the control switch and busbar joints, avoiding gap discharge and insulation degradation, and ensuring the normal operation of the primary and secondary equipment group.

[0019] 4. This invention also integrates a ventilation system linked to the isolation structure. When an electric arc is generated, the rigid connecting plate rotates, causing the extrusion component to drive the pressure ring to slide, drawing in dry gas from the ring network box through the air inlet pipe for storage. After the arc is extinguished, the isolation plate resets at its end, and the spring pushes the pressure ring back, sending the dry gas through the exhaust pipe into the enclosed space to replace and neutralize residual metal vapor and conductive particles. This design not only dilutes harmful gases and improves the insulation strength of the local space, but also reduces humidity and inhibits condensation. Without interfering with the arc extinguishing process, it significantly reduces the risk of secondary discharge and ensures a clean environment around the equipment.

[0020] 5. This invention also adopts a modular integrated design, with the insulating jacket linked to the switch door. Closing the switch door completes the construction of the enclosed space without additional operation. The isolation structure driven by shape memory alloy does not require complex limit guidance. It achieves automatic opening and closing through material properties, and the response speed matches the arc timing. At the same time, the disassembly ring on the insulating jacket facilitates the maintenance and replacement of core components. The flexible vent pipe is adapted to the opening and closing action of the switch door without affecting the normal operation of the equipment. The overall structure is compact and does not interfere with the operation of primary and secondary equipment such as control switches, DTUs, and sensors. It retains the basic functions of traditional ring main units while adding multiple layers of protection, making it suitable for various scenarios such as urban power distribution networks and industrial parks. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the present invention; Figure 3 This is a schematic diagram of the inner structure of a single door in this invention; Figure 4 This is a schematic diagram of the connection structure of the outer jacket in this invention; Figure 5 This is a schematic diagram of a half-section of the outer casing in this invention; Figure 6 This is a schematic diagram of the fixing frame in this invention; Figure 7 This is a half-section schematic diagram of the arc-extinguishing structure in this invention; Figure 8 This is a schematic diagram of the disassembled structure of the arc-extinguishing structure in this invention; Figure 9 For the present invention Figure 5 Enlarged view of the structure at point A in the middle; Figure 10 This is a schematic diagram of a single isolation structure under normal conditions in this invention; Figure 11 This is a half-section diagram of a single isolation structure in the present invention when it is in contact with an electric arc; Figure 12 For the present invention Figure 11 Enlarged view of the structure at point B; Figure 13 This is a schematic diagram of a single isolation structure of the present invention when it is in contact with an electric arc.

[0022] Explanation of the labels in the diagram: 1. Ring network enclosure; 2. Primary and secondary equipment group; 3. Control switch; 4. Switch door; 5. Fixed lock; 6. Isolation base; 7. Isolation jacket; 8. Rubber sealing ring; 9. Arc extinguishing structure; 10. Air outlet pipe; 11. One-way valve; 12. Fixing frame; 121. Separation port; 13. Isolation structure; 14. Deformation cavity; 141. Pressure surface; 15. Compressed air cavity; 16. Ventilation structure; 17. Extrusion component; 18. Disassembly ring; 901. Ceramic ring; 902. Metal grille ring; 9021. Grille ring shell; 9022. Grille outer cover; 903. Isolation arc extinguishing plate; 131. Isolation plate; 132. Isolation drive component; 1321. Rigid connecting plate; 1322. Bending and pressing arc plate; 161. Pressure ring; 162. Soft rubber layer; 163. Air storage space; 164. Spring; 165. Exhaust pipe; 166. Intake pipe; 171. Pressure driving section; 172. Stabilizing section. Detailed Implementation

[0023] like Figures 1 to 13 As shown, the present invention relates to a primary and secondary integrated ring network box, including a ring network box body 1, a primary and secondary equipment group 2 is arranged inside the ring network box body 1, a control switch 3 is arranged on the primary and secondary equipment group 2, and a plurality of switch doors 4 are rotatably connected to one side of the ring network box body 1, and a fixed lock 5 is installed on the switch doors 4.

[0024] An insulating base 6 is fixed to the inside of the switch door 4 near the control switch 3. An insulating jacket 7 is fixed to one side of the insulating base 6. Both the insulating jacket 7 and the insulating base 6 are made of insulating material. A concave annular groove is opened on one side of the insulating jacket 7, and a rubber sealing ring 8 is bonded to the annular groove. When the switch door 4 is closed, the rubber sealing ring 8 is in close contact with the outer periphery of the control switch 3. The elastic design of the rubber sealing ring 8 allows it to be in close contact with the outer periphery of the control switch 3, thus achieving space sealing.

[0025] An arc-extinguishing structure 9 is provided on the inner circumference of the insulating jacket 7. The arc-extinguishing structure 9 includes a ceramic ring 901 with multiple through holes. A metal grid ring 902 is connected to the outer circumference of the ceramic ring 901. The gaps between the grid plates of the metal grid ring 902 are filled with an insulating arc-extinguishing plate 903. The insulating arc-extinguishing plate 903 is made of an intumescent arc-extinguishing material. When triggered by the high temperature of the electric arc, the insulating arc-extinguishing plate 903 can expand instantly and release arc-extinguishing gas. An exhaust pipe 10 is connected between the bottom of the outer circumference of the insulating base 6 and the exhaust groove of the ring network box 1. Each ring network box 1 is provided with an exhaust groove. The exhaust pipe 10 is made of a soft material to facilitate the opening and closing of the door 4.

[0026] The 903 isolation arc extinguishing plate is preferably made of zinc borate-mica composite solid arc extinguishing medium. When an electric arc is generated (temperature ≥800℃), the medium particles decompose upon heating, releasing CO2 and H2O arc extinguishing gases. At the same time, the volume expands three to five times, quickly sealing the gaps between the grid plates and the gaps in the inner wall of the outer jacket. This physically isolates the arc channel and blocks air replenishment, achieving triple arc extinguishing through "grid plate segmentation + gas cooling + physical sealing". Other similar materials can also be used for the 903 isolation arc extinguishing plate.

[0027] Working principle: When the switch door 4 is closed and locked by the fixing lock 5, the rubber sealing ring 8 on one side of the insulating jacket 7 is elastically attached to the outer periphery of the control switch 3. Together with the insulating base 6 and the insulating material of the insulating jacket 7, a closed space is formed outside the control switch 3, preventing the electric arc from spreading to other areas inside the ring network box 1 and avoiding secondary discharge caused by derivative electric arcs.

[0028] When the control switch 3 is disconnected and an electric arc is generated (temperature ≥800℃), the grid of the metal grid ring 902 first divides the electric arc into multiple short arcs, reducing the arc energy and stability; at the same time, the high temperature of the electric arc triggers the isolation arc-extinguishing plate 903 (zinc borate-mica composite solid medium) in the gap of the grid, causing it to decompose rapidly and release CO2 and H2O arc-extinguishing gases. The gases diffuse rapidly in the enclosed space, cooling the electric arc and diluting the conductive particles in the arc area, weakening the conductivity of the electric arc.

[0029] During the decomposition process, the isolation arc extinguishing plate 903 expands in volume by three to five times, tightly sealing the gaps between the metal grid ring 902 and the gaps in the inner wall of the electric isolation jacket 7, physically blocking the arc channel and air supply, thus achieving "arc extinguishing without oxygen supply"; the waste gas and excess gas generated during arc extinguishing are guided to the exhaust groove of the ring network box 1 through the flexible exhaust pipe 10 at the bottom of the electric isolation base 6, avoiding the gas volume pressure from affecting the arc extinguishing effect, and finally completely extinguishing the arc.

[0030] Furthermore, the process of arc extinguishing generates high-temperature gas. After the arc is extinguished, the high-temperature gas cools down rapidly and condenses, leading to the formation of an electrolyte film. To reduce or avoid condensation, the following structure is designed.

[0031] The metal grid ring 902 is composed of a grid ring shell 9021 and a grid outer cover 9022. There is an insulation space between the grid ring shell 9021 and the grid outer cover 9022. The insulation space is filled with a phase change material, preferably paraffin wax.

[0032] Working principle: When the control switch 3 is disconnected and an electric arc is generated, the high temperature (≥800℃) is transferred through the grid plate of the metal grid ring 902 to the heat insulation space between the grid ring shell 9021 and the grid outer cover 9022. The paraffin phase change material in the heat insulation space changes from solid to liquid after being heated. During this phase change process, it absorbs and stores a large amount of heat generated by the electric arc, avoiding rapid heat diffusion that could cause a sudden rise or fall in local temperature.

[0033] When the electric arc is extinguished by the arc-extinguishing structure 9, the internal ambient temperature of the ring network box 1 begins to drop. At this time, the paraffin phase change material gradually cools down and releases the stored heat. The heat is transferred through the grid ring shell 9021 to the metal grid ring 902 grid plate and the inner wall of the electric insulation jacket 7, continuously maintaining the temperature of the inner wall area.

[0034] Paraffin phase change materials have a large latent heat of phase change, and the heat storage and release processes are mild and long-lasting. This allows the temperature of the metal grid ring 902 and the inner wall of the insulating jacket 7 to be stably maintained above 50°C (far higher than the ambient dew point temperature). This temperature is sufficient to suppress the condensation of high-temperature arc-quenching gas after cooling, prevent the formation of an electrolyte film on the surface of the insulating parts, eliminate the risk of secondary discharge caused by the adhesion of metal vapor, and ensure the insulation performance of the ring main unit in harsh environments such as high humidity and salt spray.

[0035] The phase change temperature of paraffin phase change material is about 58℃, and the latent heat of phase change can reach 200-250kJ / kg. After a single heat storage, the heat release can last for more than 30 minutes. It can stably maintain the inner wall temperature at 50-60℃. This temperature range can effectively avoid the generation of condensate (the ambient dew point temperature is usually below 30℃), and will not affect the normal operation of surrounding components due to excessive temperature, fully meeting the requirements for anti-condensation.

[0036] Furthermore, during the process of extinguishing the electric arc, the extinguishing gas may contain metal vapor and ionized conductive particles. If these cannot be discharged in time, they will reduce the gas insulation strength in the enclosed space, which may easily cause gap discharge or secondary arcs at the components around the control switch 3 and at the busbar joints, exacerbating the carbonization of insulation components and creepage risk, and affecting the normal operation of the primary and secondary equipment group 2. In view of this point, the following structure is designed.

[0037] A one-way valve 11 is fixed at the center of one end of the insulating jacket 7 near the rubber sealing ring 8. A fixing frame 12 is fixed on the outer periphery of the one-way valve 11. The fixing frame 12 is provided with multiple partitions 121. Multiple isolation structures 13 are provided at one end of the insulating jacket 7.

[0038] The isolation structure 13 includes an isolation plate 131 with the same size as the partition opening 121. An elastic sealing strip is fixed to the outer periphery of the isolation plate 131. The isolation plate 131 has a fan-shaped arc structure. Multiple isolation driving components 132 are fixed to the outer arc edge of the isolation plate 131. A deformation cavity 14 is opened at one end of the electrical insulation jacket 7. A pressure-bearing surface 141 is provided on the deformation cavity 14.

[0039] The isolation drive component 132 includes a rigid connecting plate 1321 fixed to the isolation plate 131. The rigid connecting plate 1321 is rotatably connected to the electrical isolation jacket 7. A bending arc plate 1322 is fixed on one side of the rigid connecting plate 1321. The outer periphery of the bending arc plate 1322 is in contact with the inner wall of the deformation cavity 14. One end of the bending arc plate 1322 is in contact with the pressure surface 141. The isolation plate 131 and the bending arc plate 1322 are made of deformable shape memory alloy.

[0040] The isolation plate 131 and the bending arc plate 1322 are preferably high-temperature nickel-titanium-niobium (Ni-Ti-Nb) shape memory alloys, which have the characteristics of "millisecond-level thermal response deformation + instantaneous elastic recovery". The deformation speed can match the speed of the electric arc. The deformation control only needs to be preset in the manufacturing process to determine the shape before and after deformation, which can be achieved through its own material properties. There is no need to set up a limiting or guiding structure. The "instantaneous" nature of the electric arc is reflected in "fast discharge start" (≤1ms), but the physical movement speed is relatively slow (gas diffusion characteristics). The deformation of the SMA valve is "thermally driven instantaneous deformation". The high-temperature conduction and alloy phase transformation have almost no delay. The deformation speed is far greater than the electric arc movement speed. There is no problem of "the arc has arrived before the valve opens".

[0041] Working principle: After the switch door 4 is closed, the isolation plate 131 of the isolation structure 13 is precisely aligned with the partition opening 121 of the fixed frame 12. The elastic sealing strip on the outer periphery of the isolation plate 131 is tightly attached to the inner wall of the partition opening 121, forming a closed state. At this time, the outer periphery of the bent arc plate 1322 is tightly attached to the inner wall of the deformation cavity 14, further enhancing the sealing effect and preventing the gas inside the ring network box from directly contacting the area around the control switch 3, thus avoiding the adhesion of harmful gases.

[0042] When the control switch 3 is disconnected and an electric arc is generated (temperature ≥800℃), the high temperature is rapidly conducted to the bending arc plate 1322 (high temperature nickel-titanium-niobium shape memory alloy), triggering the alloy's millisecond-level thermal response deformation. During the deformation process, one end of the bending arc plate 1322 squeezes the pressure surface 141 of the deformation cavity 14, causing the rigid connecting plate 1321 to rotate around the connection point of the insulating jacket 7, thereby driving the fan-shaped arc-shaped isolation plate 131 to rotate open synchronously, quickly opening the partition 121 of the fixing frame 12, forming a smooth channel, ensuring that the electric arc and arc-extinguishing gas can smoothly enter the arc-extinguishing structure 9 area inside the insulating jacket 7 without obstruction affecting the arc-extinguishing process.

[0043] After the arc is extinguished, the ambient temperature drops rapidly. Under the elastic recovery characteristics of the shape memory alloy, the bending arc plate 1322 and the isolation plate 131 instantly reverse their deformation and reset. The rigid connecting plate 1321 drives the isolation plate 131 to close the partition opening 121 again, and the elastic sealing strip closes tightly again. At the same time, the one-way valve 11 in the center of the insulating jacket 7 remains open under the internal air pressure after the arc is extinguished, guiding the harmful gas mixed with metal vapor and conductive particles to the exhaust pipe 10 for discharge. After the gas is discharged, the one-way valve 11 closes, and together with the sealing of the isolation plate 131, it completely prevents the residual harmful gas from contacting the components around the control switch 3 and the busbar connection, avoiding the risks of gap discharge, secondary arc, carbonization of insulation components, and creepage, and ensuring the normal operation of the primary and secondary equipment group 2.

[0044] Furthermore, in order to further reduce the retention of arc-quenching gas.

[0045] The insulating jacket 7 has a compressed air chamber 15 at one end, and the compressed air chamber 15 is equipped with a ventilation structure 16.

[0046] The ventilation structure 16 includes a pressure ring 161, which is an annular plate structure. The pressure ring 161 slides and limits the air compression chamber 15. Two soft rubber layers 162 are connected between one side of the pressure ring 161 and the air compression chamber 15. An air storage space 163 is formed between the pressure ring 161 and the two soft rubber layers 162. A spring 164 is connected between the pressure ring 161 and the air compression chamber 15. The force of the spring 164 is much smaller than the driving force.

[0047] The gas storage space 163 is connected to an exhaust pipe 165 that passes through the insulating jacket 7 and connects the inner wall space between the rubber sealing ring 8 and the fixing frame 12. The gas storage space 163 is also connected to an intake pipe 166, which is composed of a corrugated folded pipe and a rigid pipe. Both the intake pipe 166 and the exhaust pipe 165 are equipped with one-way valves.

[0048] One end of the pressure ring 161 is provided with a rounded chamfer to facilitate extrusion. An extrusion member 17 is provided above one end of the pressure ring 161. The extrusion member 17 is composed of a driving section 171 and a stabilizing section 172. The driving section 171 is connected to the rigid connecting plate 1321. The driving section 171 has an arc-shaped structure with a gradually increasing diameter centered on the rotation point of the rigid connecting plate 1321. The entire stabilizing section 172 is an arc-shaped structure with the same distance from the rotation point of the rigid connecting plate 1321.

[0049] Working principle: When the control switch 3 generates an electric arc, the rigid connecting plate 1321 of the isolation drive component 132 is driven to rotate by high temperature, which drives the extrusion component 17 to rotate synchronously. In the initial stage, the driving section 171 (an arc-shaped structure with gradually increasing diameter) of the extrusion component 17 contacts the rounded chamfer of the pressure ring 161. As the rotation continues, the extrusion force is continuously applied, pushing the pressure ring 161 to slide along the limit of the air chamber 15, compressing the spring 164 and squeezing the air storage space 163. At this time, the one-way valve on the air inlet pipe 166 opens, and the dry gas inside the ring network box 1 is sucked into the air storage space 163 for storage. The one-way valve on the exhaust pipe 165 closes to prevent gas backflow.

[0050] When the rigid connecting plate 1321 rotates to the preset angle, the stable section 172 of the extrusion member 17 (an arc-shaped structure equidistant from the rotation point) fits against the pressure ring 161. At this time, no additional extrusion force is generated, the pressure ring 161 remains in a fixed position, and the gas storage space 163 maintains the gas storage volume to prepare for subsequent gas exchange, while not affecting the normal arc extinguishing of the arc extinguishing structure 9.

[0051] After the arc is extinguished, the rigid connecting plate 1321 drives the extrusion member 17 to rotate in the reverse direction. During the majority of the reset, the stabilizing section 172 is still in contact with the pressure ring 161, and the pressure ring 161 remains stationary. When the reset reaches the end stage, when the isolation plate 131 is about to contact the partition 121 of the fixing frame 12, the extrusion member 17 switches to the driving pressure section 171 facing the pressure ring 161. The spring 164 releases its elastic potential energy, pushing the pressure ring 161 to move back quickly, compressing the dry gas in the gas storage space 163. At this time, the one-way valve of the exhaust pipe 165 opens, and the dry gas rushes into the space between the rubber sealing ring 8 and the fixing frame 12 through the exhaust pipe 165, replacing and neutralizing the residual arc-extinguishing gas (including metal vapor and conductive particles) and reducing the retention of harmful gases.

[0052] The above-described operation, through sealing followed by replacement, ensures that even if there is a shortage of unreplaced gas after replacement, the introduction of dry gas can quickly dilute residual metal vapor and ionize conductive particles, improving the gas insulation performance of the space between the rubber sealing ring 8 and the fixing frame 12. This avoids gap discharge and secondary arcs caused by the retention of harmful gases, reducing the risk of carbonization of insulation components and busbar creepage from the source, and ensuring the stable operation of the primary and secondary equipment group 2. Furthermore, the dry gas can reduce the humidity of the local space and reduce the probability of condensation of water vapor in the residual arc-extinguishing gas.

[0053] The entire process is linked to the opening and closing of the isolation structure 13, which greatly reduces the risk of insulation degradation and secondary discharge caused by residual gas without interfering with the arc extinguishing process, and ensures the cleanliness of the area around the control switch 3.

[0054] It should be noted that the bending arc plate 1322 is made of high-temperature nickel-titanium-niobium (Ni-Ti-Nb) shape memory alloy, and the phase transformation recovery force can reach 200-300MPa, which is much higher than the driving force required to push the pressure ring 161.

[0055] The aforementioned one-way valve can be an existing one-way valve or a valve-type one-way design; existing technology can be used here.

[0056] Furthermore, to facilitate maintenance and disassembly, the insulating jacket 7 is fixed with a disassembly ring 18 at the rotation point of the rigid connecting plate 1321.

[0057] The embodiments disclosed in this invention are preferred embodiments, but are not limited thereto. Those skilled in the art can easily understand the spirit of this invention based on the above embodiments and make different extensions and variations, but as long as they do not depart from the spirit of this invention, they are all within the protection scope of this invention.

Claims

1. A primary and secondary integrated ring network box, characterized in that, Includes a ring network box (1), inside which a primary and secondary equipment group (2) is installed, and a control switch (3) is installed on the primary and secondary equipment group (2). Multiple switch doors (4) are rotatably connected to one side of the ring network box (1). An insulating base (6) is fixed on the inner side of the switch door (4) near the control switch (3). An insulating jacket (7) is fixed on one side of the insulating base (6). Both the insulating jacket (7) and the insulating base (6) are made of insulating material. An indented annular groove is opened on one side of the insulating jacket (7). A rubber sealing ring (8) is bonded in the annular groove. When the switch door (4) is closed, the rubber sealing ring (8) is in close contact with the outer periphery of the control switch (3). The inner circumference of the insulating jacket (7) is provided with an arc extinguishing structure (9), the arc extinguishing structure (9) includes a ceramic ring (901), the ceramic ring (901) has multiple through holes, the outer ring of the ceramic ring (901) is connected to a metal grid ring (902), the gaps between the grid plates of the metal grid ring (902) are filled with an isolation arc extinguishing plate (903), the isolation arc extinguishing plate (903) is made of an expansion type arc extinguishing material, the isolation arc extinguishing plate (903) can expand instantly and release arc extinguishing gas when triggered by the high temperature of the electric arc, and an exhaust pipe (10) is connected between the bottom of the outer circumference of the insulating base (6) and the exhaust groove of the ring network box (1).

2. The primary and secondary integrated ring network box according to claim 1, characterized in that, The metal grid ring (902) is composed of a grid ring shell (9021) and a grid outer cover (9022). A heat-insulating space is provided between the grid ring shell (9021) and the grid outer cover (9022), and the heat-insulating space is filled with a phase change material.

3. The primary and secondary integrated ring network box according to claim 2, characterized in that, The insulating jacket (7) has a one-way valve (11) fixed at the center of one end near the rubber sealing ring (8). The one-way valve (11) has a fixing frame (12) fixed on its outer periphery. The fixing frame (12) has multiple partitions (121). The insulating jacket (7) has multiple isolation structures (13) at one end.

4. The primary and secondary integrated ring network box according to claim 3, characterized in that, The isolation structure (13) includes an isolation plate (131) with the same size as the partition opening (121). An elastic sealing strip is fixed to the outer periphery of the isolation plate (131). The isolation plate (131) has a fan-shaped arc structure. Multiple isolation driving components (132) are fixed to the outer arc edge of the isolation plate (131). A deformation cavity (14) is opened at one end of the electrical insulation jacket (7). A pressure-bearing surface (141) is provided on the deformation cavity (14).

5. A primary and secondary integrated ring network box according to claim 4, characterized in that, The isolation drive component (132) includes a rigid connecting plate (1321) fixed to the isolation plate (131). The rigid connecting plate (1321) is rotatably connected to the electrical isolation jacket (7). A bending arc plate (1322) is fixed on one side of the rigid connecting plate (1321). The outer periphery of the bending arc plate (1322) is in contact with the inner wall of the deformation cavity (14). One end of the bending arc plate (1322) is in contact with the pressure surface (141). The isolation plate (131) and the bending arc plate (1322) are made of deformable shape memory alloy.

6. A primary and secondary integrated ring network box according to claim 5, characterized in that, The insulating jacket (7) has a compressed air chamber (15) at one end, and the compressed air chamber (15) is provided with an air exchange structure (16).

7. A primary and secondary integrated ring network box according to claim 6, characterized in that, The ventilation structure (16) includes a pressure ring (161), which is an annular plate structure. The pressure ring (161) slides and limits the air pressure chamber (15). Two soft rubber layers (162) are connected between one side of the pressure ring (161) and the air pressure chamber (15). An air storage space (163) is formed between the pressure ring (161) and the two soft rubber layers (162). A spring (164) is connected between the pressure ring (161) and the air pressure chamber (15).

8. A primary and secondary integrated ring network box according to claim 7, characterized in that, The gas storage space (163) is connected to an exhaust pipe (165) that passes through the insulating jacket (7) and connects the inner wall space between the rubber sealing ring (8) and the fixing frame (12). The gas storage space (163) is also connected to an air inlet pipe (166). The air inlet pipe (166) is composed of a corrugated folded pipe and a rigid pipe. Both the air inlet pipe (166) and the exhaust pipe (165) are equipped with one-way valves.

9. A primary and secondary integrated ring network box according to claim 8, characterized in that, One end of the pressure ring (161) is provided with a rounded chamfer to facilitate extrusion. An extrusion member (17) is provided above one end of the pressure ring (161). The extrusion member (17) is composed of a driving section (171) and a stabilizing section (172). The driving section (171) has an arc-shaped structure with a gradually increasing diameter centered on the rotation point of the rigid connecting plate (1321). The entire stabilizing section (172) is an arc-shaped structure with the same distance from the rotation point of the rigid connecting plate (1321).

10. A primary and secondary integrated ring network box according to claim 9, characterized in that, The insulating jacket (7) is located at the rotation point of the rigid connecting plate (1321) and is fixed with a disassembly ring (18).

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