A primary-secondary integrated ring network cabinet

Abstract

The present invention discloses a primary-secondary integrated ring main unit, which relates to the technical field of ring main units. It includes a ring main unit body, an outer shell fixedly connected inside the ring main unit body, an inner shell fixedly connected inside the outer shell, and a partition fixedly connected between the outer shell and the inner shell for dividing the space between the outer shell and the inner shell into upper and lower chambers. A pressure sensor is installed outside the inner shell, and it also includes a pressure relief mechanism for releasing the pressure in the inner shell; a conveying mechanism, the conveying mechanism includes an electric telescopic rod fixedly installed on the inner wall of the outer shell, and the environmental protection gas in the lower chamber is input into the inner shell through the conveying mechanism to restore the concentration of the environmental protection gas in the inner shell and improve the insulation performance inside the inner shell. Moreover, the environmental protection gas can be sprayed into the inner shell under a certain pressure to form a high-speed air flow, generate a powerful arc-blowing force, accelerate the extinction of the arc, protect the contacts and other components of the load switch from being ablated by the arc, and contain the expansion of the fault.

Description

Technical Field

[0001] The present invention relates to the technical field of ring main units, and particularly to a primary-secondary integrated ring main unit. Background Art

[0002] The primary-secondary integrated ring main unit is a highly integrated power device for intelligent distribution networks. It is a compact and intelligent high-efficiency power distribution unit constructed by deeply integrating traditional primary devices and secondary devices arranged dispersedly. Among them, the primary devices, as the core carriers for power transmission and distribution, cover key components such as circuit breakers, load switches, and earthing switches in the primary-secondary integrated ring main unit; the secondary devices include DTU terminals, various sensors, and communication modules, etc. The primary devices are responsible for directly generating, transmitting, and distributing electric energy, while the secondary devices monitor, control, protect, and regulate the primary devices. When a fault is detected, the secondary devices issue commands to make the circuit breaker in the primary devices quickly cut off the current to protect the lines and devices. The two cooperate closely to ensure the stable, safe, and efficient operation of the primary-secondary integrated ring main unit and even the entire power system.

[0003] When the load switch in the primary-secondary integrated ring main unit breaks the current, an electric arc will be generated. In order to extinguish the electric arc within a short time when cutting off the circuit and avoid damage to the equipment and lines caused by the continuous burning of the electric arc, the chamber where the load switch is located is generally filled with an environmentally friendly mixed gas composed of heptafluoroisobutyronitrile and carbon dioxide, and the insulating ability of the environmentally friendly mixed gas is used for arc extinguishing.

[0004] When insulation breakdown, short circuit and other faults occur inside the load switch, the temperature of the environmentally friendly mixed gas will rise sharply and decompose, which will further cause a significant increase in the pressure in the chamber where the load switch is located, deforming and cracking the switch housing, and even triggering serious accidents such as explosion. In order to avoid this situation, existing ring main units usually install a pressure relief valve on the switch housing, and the pressure relief valve automatically opens when the internal pressure of the chamber reaches a certain threshold to release the excess gas. However, with the continuous decomposition and discharge of the environmentally friendly mixed gas in the chamber, the concentration of the environmentally friendly mixed gas will decrease significantly, resulting in a reduction in the insulation performance in the chamber, and it is difficult to contain the faults that occur in the load switch, which is likely to further exacerbate the faults and cause large-area damage to the ring main unit. Summary of the Invention

[0005] The purpose of the present invention is to propose a primary-secondary integrated ring main unit to solve the problem that when a fault occurs in the load switch of the ring main unit, with the continuous decomposition and discharge of the environmentally friendly mixed gas in the chamber where the load switch is located, the concentration of the environmentally friendly mixed gas will decrease significantly, resulting in a reduction in the insulation performance in the chamber, and it is difficult to contain the faults that occur in the load switch, which is likely to further exacerbate the faults.

[0006] To achieve the above object, the present invention adopts the following technologies: A primary-secondary integrated ring main cabinet, including a ring main cabinet body, an outer shell body is fixedly connected inside the ring main cabinet body, an inner shell body is fixedly connected inside the outer shell body, a partition for dividing the space between the outer shell body and the inner shell body into upper and lower chambers is fixedly connected between the outer shell body and the inner shell body, a pressure sensor is installed outside the inner shell body, and further includes:

[0007] A pressure relief mechanism for releasing the pressure in the inner shell body;

[0008] A conveying mechanism, the conveying mechanism includes an electric telescopic rod fixedly installed on the inner wall of the outer shell body and a conveying cylinder communicated with the lower chamber, a piston plate is slidably connected inside the conveying cylinder, a check valve one is fixedly installed at one end of the conveying cylinder, a check valve two is fixed between the conveying cylinder and the inner shell body, and a pressure maintaining component and a jetting component are arranged inside the conveying cylinder;

[0009] During the process of the piston plate conveying gas, the check valve two is temporarily blocked by the pressure maintaining component, so that the gas inside the conveying cylinder is pressurized and then sprayed into the inner shell body.

[0010] As a further description of the above technical solution: The pressure maintaining component includes a sealing ring rotatably connected inside the conveying cylinder, a tension spring is fixed between the sealing ring and the inner wall of the conveying cylinder, and inclined blocks are fixedly connected to the opposite sides of the sealing ring and the piston plate.

[0011] As a further description of the above technical solution: The jetting component includes a discharge cylinder rotatably connected inside the conveying cylinder and penetrating through the piston plate, a check valve three is fixedly installed at one end of the discharge cylinder, a piston rod fixedly connected to the telescopic end of the electric telescopic rod is movably connected inside the discharge cylinder, a spring telescopic rod is fixedly connected between the piston plate and the telescopic end of the electric telescopic rod, and the lower chamber is divided into a heptafluoroisobutyronitrile chamber and a carbon dioxide chamber and is respectively communicated with the check valve three and the check valve one.

[0012] As a further description of the above technical solution: A chute is formed on the edge of the piston rod, a spiral protrusion embedded in the chute of the piston rod is arranged on the inner wall of the discharge cylinder, and when the piston rod moves, the discharge cylinder is driven to rotate through the chute and the spiral protrusion.

[0013] As a further description of the above technical solution: The pressure relief mechanism includes an installation shell fixedly connected to the top of the inner shell body, a pressure balance unit and a pressure relief component are arranged inside the installation shell, the pressure balance unit includes an outer sealing plate slidably connected inside the installation shell, and a spring one is arranged between the outer sealing plate and the installation shell.

[0014] As a further description of the above technical solution: the pressure relief assembly includes an inner tube fixed on the outer sealing plate, the inner part of the inner tube is slidably connected with the inner sealing plate, and a spring 2 is provided between the inner sealing plate and the inner tube.

[0015] As a further description of the above technical solution: an air uniforming mechanism is arranged inside the inner shell, and the air uniforming mechanism includes a shielding frame fixed to the inner top wall of the inner shell, and a plurality of gear rings are rotatably connected inside the inner shell, and blades are fixedly connected to the inner wall of the gear ring.

[0016] As a further description of the above technical solution: the inner shell is internally rotatably connected to a gear that is transmission-connected between the gear rings, the inner shielding frame is internally rotatably connected to the gear rings, and the top and bottom of the inner sealing plate are respectively fixedly connected to an impeller and a square rod passing through the gear rings.

[0017] In summary, due to the adoption of the above-mentioned technology, a primary and secondary fusion ring network box, the beneficial effects of the present invention are:

[0018] In the present application, after a load switch fails and the concentration of the environmentally friendly gas inside the inner shell decreases, the environmentally friendly gas composed of a mixture of heptafluoroisobutyronitrile and carbon dioxide stored separately in the lower chamber is input into the inner shell through a conveying mechanism, thereby restoring the concentration of the environmentally friendly gas in the inner shell, improving the insulation performance inside the inner shell, and avoiding further deterioration of the fault, so that the maintenance personnel can respond in time to ensure the safety of the ring network box. Moreover, under the action of the pressure maintaining component, the environmentally friendly gas can be sprayed into the inner shell under a certain pressure to form a high-speed airflow and generate a strong arc blowing force. The arc generated by the fault is elongated and blown away through the arc blowing action, so that the charged particles in the arc diffuse rapidly, the ion concentration in the arc is reduced, and the conditions for maintaining the arc are destroyed, thereby accelerating the extinction of the arc and protecting the contacts and other components of the load switch from arc erosion. At the same time, the environmentally friendly gas sprayed in at high pressure can quickly absorb the heat of the arc, rapidly reduce the arc temperature, weaken the energy of the arc, and help to extinguish the arc and reduce the heat of the load switch, curb the expansion of the fault, and buy time for maintenance personnel.

[0019] The jet assembly can be used to separate the internal space of the conveying tube into two parts, an inner part and an outer part. In the process of conveying environmentally friendly gases, heptafluoroisobutyronitrile in the discharge tube can be ejected from multiple air holes under pressure to form multiple air flows that quickly penetrate the carbon dioxide in the conveying tube, so that the two gases can be quickly and fully mixed before entering the inner shell, thereby improving the uniformity of the formed environmentally friendly gas, thereby ensuring the insulating performance of the environmentally friendly gas. At the same time, the two gases can be further mixed when pressurized inside the conveying tube. In addition, under the action of the spiral protrusion, the discharge tube can be deflected during the pressurization process, so that the position of the gas ejected from the discharge tube is constantly changing, and the gas inside the conveying tube is disturbed, thereby further improving the gas uniformity and ensuring the insulating effect of the environmentally friendly gas.

[0020] When the temperature inside the inner housing changes, the pressure balancing unit can balance the gas pressure by means of the internal space of the mounting housing, so that when there is a small pressure change inside the inner housing, the environmentally friendly gas can be kept stable, ensuring the insulation inside the inner housing, avoiding gas breakdown when the load switch in the ring main unit is in use, enhancing the safety performance of the ring main unit, and when the pressure inside the inner housing rises significantly due to a failure of the load switch inside the inner housing, the pressure relief component can discharge the gas, drive the blade to rotate by means of the air flow thrust, disperse the environmentally friendly gas decomposed at the closing point of the load switch, make the undecomposed environmentally friendly gas fill the surrounding of the closing point, enhance the insulation around the closing point, ensure the safe operation of the equipment and improve the power supply reliability. At the same time, the dispersed gas is more likely to be discharged through the pressure relief mechanism under the shielding of the shielding frame, reducing the impact of gas discharge on the insulation performance inside the inner housing. Description of the Drawings

[0021] Figure 1 Shows the overall schematic diagram provided according to an embodiment of the present invention;

[0022] Figure 2 Shows the overall internal schematic diagram provided according to an embodiment of the present invention;

[0023] Figure 3 Shows the schematic diagram of the outer housing provided according to an embodiment of the present invention;

[0024] Figure 4 Shows the cross-sectional schematic diagram of the outer housing provided according to an embodiment of the present invention;

[0025] Figure 5 Shows the schematic diagram of the telescopic rod provided according to an embodiment of the present invention;

[0026] Figure 6 Shows the cross-sectional schematic diagram of the conveying cylinder provided according to an embodiment of the present invention;

[0027] Figure 7 Shows the schematic diagram of the sealing ring provided according to an embodiment of the present invention;

[0028] Figure 8 Shows the cross-sectional schematic diagram of the discharge cylinder provided according to an embodiment of the present invention;

[0029] Figure 9 Shows the internal schematic diagram of the inner housing provided according to an embodiment of the present invention;

[0030] Figure 10 Shows the cross-sectional schematic diagram of the mounting housing provided according to an embodiment of the present invention;

[0031] Figure 11 Shows the one provided according to an embodiment of the present invention Figure 10Enlarged view at location A in the figure.

[0032] Legend:

[0033] 10, Ring network box body; 11, Outer shell body; 12, Inner shell body; 13, Partition board; 14, Pressure sensor;

[0034] 20, Pressure relief mechanism; 21, Mounting shell; 22, Pressure balance unit; 221, Outer sealing plate; 222, Spring 1; 23, Pressure relief component; 231, Inner pipe; 232, Inner sealing plate; 233, Spring 2; 24, Gas equalizing mechanism; 241, Impeller; 242, Square rod; 243, Tooth ring; 244, Blade; 245, Gear; 246, Shielding frame;

[0035] 30, Conveying mechanism; 31, Electric telescopic rod; 32, Conveying cylinder; 33, Check valve 1; 34, Check valve 2; 35, Piston plate; 36, Pressure maintaining component; 361, Inclined block; 362, Sealing ring; 363, Tension spring; 37, Jet component; 371, Discharge cylinder; 372, Check valve 3; 373, Piston rod; 374, Spring telescopic rod; 38, Spiral protrusion. Specific implementation mode

[0036] Next, the accompanying drawings in the embodiments of the present invention will be combined to clearly and completely describe a primary-secondary integrated ring network box in the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0037] As Figures 1 - 11 shown, a primary-secondary integrated ring network box provided by the present invention includes a ring network box body 10. An outer shell body 11 is fixedly connected inside the ring network box body 10. An inner shell body 12 is fixedly connected inside the outer shell body 11. A partition board 13 for separating the space between the outer shell body 11 and the inner shell body 12 into upper and lower chambers is fixedly connected between the outer shell body 11 and the inner shell body 12. The upper and lower chambers are respectively used for storing the discharged waste gas and the standby environmental protection gas. A pressure sensor 14 is installed outside the inner shell body 12. It further includes:

[0038] A pressure relief mechanism 20 for releasing the pressure in the inner shell body 12;

[0039] The conveying mechanism 30 includes an electric telescopic rod 31 fixedly installed on the inner wall of the outer housing 11 and a conveying cylinder 32 communicating with the lower chamber. A piston plate 35 is slidably connected inside the conveying cylinder 32. A check valve one 33 is fixedly installed at one end of the conveying cylinder 32, and a check valve two 34 is fixed between the conveying cylinder 32 and the inner housing 12. When the pressure sensor 14 detects a decrease in the pressure inside the inner housing 12, the electric telescopic rod 31 is activated. When the electric telescopic rod 31 extends and drives the piston plate 35 to move, the check valve one 33 closes and the check valve two 34 opens, so that the environmental protection gas inside the conveying cylinder 32 is conveyed into the inner housing 12 through the check valve two 34, increasing the concentration of the environmental protection gas inside the inner housing 12 and curbing the expansion of the fault. When the electric telescopic rod 31 contracts and drives the piston plate 35 to move, the check valve one 33 opens and the check valve two 34 closes, and the gas in the lower chamber is sucked into the conveying cylinder 32 through the check valve one 33 to realize continuous gas conveyance. A pressure maintaining component 36 and a jet component 37 are arranged inside the conveying cylinder 32;

[0040] During the process of the piston plate 35 conveying gas, the check valve two 34 is temporarily blocked by the pressure maintaining component 36, so that the gas inside the conveying cylinder 32 is pressurized and sprayed into the inner housing 12. The sprayed environmental protection gas forms a high-speed air flow, generating a strong arc blowing force, accelerating the extinction of the arc, protecting the contacts and other components of the load switch from being ablated by the arc, and curbing the expansion of the fault.

[0041] Refer to Figure 6 、 Figure 7 and Figure 8In order to make the environmental protection gas have a certain speed to blow out the arc when it is transported to the inside of the inner shell 12, the pressure maintaining component 36 includes a sealing ring 362 rotatably connected to the inside of the conveying cylinder 32, and the top opening of the sealing ring 362 is staggered with the one-way valve 34, so that the one-way valve 34 is sealed and blocked, and a tension spring 363 is fixed between the sealing ring 362 and the inner wall of the conveying cylinder 32, and the inner wall of the conveying cylinder 32 is provided with a protrusion supporting the sealing ring 362. When the tension spring 363 is stretched, the sealing ring 362 abuts against the protrusion under the elastic force of the tension spring 363. At this time, the protrusion supports the sealing ring 362 to limit its rotation, and at this time, the sealing ring 362 is subjected to the elastic tension of the tension spring 363 and will not rotate under the action of the airflow, ensuring the stability of the sealing ring 362. The opposite sides of the sealing ring 362 and the piston plate 35 are fixedly connected with an inclined block 361, and the extension of the electric telescopic rod 31 drives the spring telescopic rod 374 and the piston plate 35 to move, and the piston plate 35 drives the inclined block 361 fixed thereto. When 61 pushes the inclined block 361 on the sealing ring 362, the sealing ring 362 is deflected, so that the opening at the top of the sealing ring 362 is connected to the one-way valve 34. At this time, the sealing ring 362 no longer blocks the one-way valve 34, and the pressurized environmentally friendly gas inside the conveying cylinder 32 pushes the one-way valve 34 open and sprays into the inner shell 12, while restoring the environmentally friendly gas concentration inside the inner shell 12 and generating high-speed airflow arc extinguishing. It is worth mentioning that when the one-way valve 34 is blocked and the pressure inside the conveying cylinder 32 increases, the environmentally friendly gas can also be deeply mixed under the action of pressure, thereby improving the uniformity of the environmentally friendly gas, and then making the environmentally friendly gas have a better insulation effect when it is sprayed into the inner shell 12. The one-way valve 34 does not use a pressure relief valve because as the pressure of the gas sprayed out from the conveying cylinder 32 gradually decreases, the pressure relief valve will be closed before the gas inside the conveying cylinder 32 is sprayed out, leaving a large amount of environmentally friendly gas inside the conveying cylinder 32, which is not conducive to the transportation of environmentally friendly gas.

[0042] Reference Figure 8, the lower chamber is divided into a heptafluoroisobutyronitrile chamber and a carbon dioxide chamber. The two chambers are respectively used to store spare heptafluoroisobutyronitrile and carbon dioxide, which are used to mix and form an environmental protection gas to be filled into the inner housing 12 when a fault occurs in the load switch inside the inner housing 12, so as to contain the expansion of the fault. The purpose of separate storage is to facilitate the management and maintenance of the two gases. In order to enable the two gases to be quickly and evenly mixed before being transported to the inside of the inner housing 12, the jet assembly 37 includes a discharge cylinder 371 rotatably connected inside the delivery cylinder 32 and penetrating the piston plate 35. One end of the discharge cylinder 371 is fixedly installed with a check valve three 372. A piston rod 373 fixedly connected to the telescopic end of the electric telescopic rod 31 is movably connected inside the discharge cylinder 371. A spring telescopic rod 374 is fixedly connected between the piston plate 35 and the telescopic end of the electric telescopic rod 31. The heptafluoroisobutyronitrile chamber and the carbon dioxide chamber are respectively communicated with the check valve three 372 and the check valve one 33. When the electric telescopic rod 31 contracts, it drives the spring telescopic rod 374, the piston plate 35 and the piston rod 373 to move. At this time, the check valve one 33 and the check valve three 372 are opened, and the gases in the heptafluoroisobutyronitrile chamber and the carbon dioxide chamber are respectively sucked into the discharge cylinder 371 and the delivery cylinder 32. When the electric telescopic rod 31 extends to drive the piston plate 35 and the piston rod 373 to move, the pressures inside the discharge cylinder 371 and the delivery cylinder 32 increase simultaneously. At this time, due to the existence of the spring telescopic rod 374, when the piston plate 35 is affected by the gas pressure inside the delivery cylinder 32, it will move relative to the piston rod 373 in a direction away from the check valve one 33, causing the spring telescopic rod 374 to be compressed. The increasing speed of the carbon dioxide gas pressure between the delivery cylinder 32 and the discharge cylinder 371 is less than the increasing speed of the heptafluoroisobutyronitrile gas pressure inside the discharge cylinder 371. Therefore, as the piston rod 373 and the piston plate 35 move, the gas inside the discharge cylinder 371 will be ejected from the pores of the discharge cylinder 371 under pressure, forming multiple airflows to be fully mixed with the carbon dioxide inside the delivery cylinder 32, improving the mixing uniformity. The maximum relative movement distance between the piston rod 373 and the piston plate 35 is less than the width of the piston plate 35, and the purpose is to prevent the piston rod 373 from disengaging from the piston plate 35, resulting in the misalignment of the two and allowing the gas to enter the side of the piston plate 35 close to the electric telescopic rod 31 through the pores of the discharge cylinder 371. A chute is provided on the edge of the piston rod 373, and a spiral protrusion 38 embedded in the chute of the piston rod 373 is provided on the inner wall of the discharge cylinder 371. When the piston rod 373 moves, the discharge cylinder 371 is driven to rotate through the chute and the spiral protrusion 38. Therefore, during the process of the piston rod 373 moving for air intake and air delivery, the discharge cylinder 371 will rotate. The rotation of the discharge cylinder 371 can not only drive the internal and external airflows to flow, accelerating the air mixing, but also continuously change the position of its pores, making the position where the gas inside the discharge cylinder 371 is ejected change continuously, further improving the mixing uniformity of the two gases and accelerating the mixing rate.

[0043] Refer to Figure 10 and Figure 11, when there is no fault in the load switch inside the inner housing 12, small changes in the external temperature will cause small changes in the air pressure inside the inner housing 12. At this time, the environmentally friendly gas inside the inner housing 12 has not decomposed, so there is no need to discharge it. In order to balance the pressure inside the inner housing 12 without discharging the environmentally friendly gas and ensure the insulation of the environmentally friendly gas inside the inner housing 12, the pressure relief mechanism 20 includes a mounting shell 21 fixedly connected to the top of the inner housing 12 and communicating with the upper chamber. A pressure balance unit 22 and a pressure relief component 23 are arranged inside the mounting shell 21. The pressure balance unit 22 includes an outer sealing plate 221 slidably connected inside the mounting shell 21. A first spring 222 is arranged between the outer sealing plate 221 and the mounting shell 21. Under the pressure of the environmentally friendly gas, the outer sealing plate 221 will slide inside the mounting shell 21, causing the space communicating the mounting shell 21 and the inner housing 12 to change, thereby balancing the air pressure of the environmentally friendly gas inside the inner housing 12.

[0044] The pressure relief component 23 includes an inner tube 231 fixed to the outer sealing plate 221. An inner sealing plate 232 is slidably connected inside the inner tube 231. A second spring 233 is arranged between the inner sealing plate 232 and the inner tube 231. After a fault occurs in the load switch inside the inner housing 12, resulting in a significant increase in the air pressure inside the inner housing 12, the outer sealing plate 221 is pushed up by the air pressure and cannot move upward. At this time, the inner sealing plate 232 is opened by the air pressure, and the environmentally friendly gas inside the inner housing 12 is discharged from the inner tube 231, avoiding excessive pressure inside the inner housing 12 from causing the load switch to be damaged more severely and preventing the inner housing 12 from being damaged under pressure.

[0045] Refer to Figure 9 and Figure 10, in order to disperse the decomposed environmental protection gas near the switch closing point when the load switch fails and maintain the insulation near the closing point to prevent the failure from continuing to expand, a gas equalizing mechanism 24 is provided inside the inner housing 12. The gas equalizing mechanism 24 includes a shielding frame 246 fixed to the top wall inside the inner housing 12. A number of toothed rings 243 are rotatably connected inside the inner housing 12. Vanes 244 are fixedly connected to the inner walls of the toothed rings 243. A gear 245 is rotatably connected inside the inner housing 12 and is drivingly connected between the toothed rings 243. A toothed ring 243 is rotatably connected inside the shielding frame 246. An impeller 241 and a square rod 242 passing through the toothed ring 243 are respectively fixedly connected to the top and bottom of the inner sealing plate 232. The leaked gas passes through the impeller 241 and drives it to rotate. The rotation of the impeller 241 drives the inner sealing plate 232, the square rod 242 and one of the toothed rings 243 to rotate, thereby driving the remaining toothed rings 243 to rotate through the gear 245, causing the vanes 244 to rotate and convey the environmental protection gas below upward, replacing the gas near the closing point of the load switch. During this process, the decomposed environmental protection gas flows upward and is more likely to approach the mounting shell 21 through the diversion of the top wall inside the inner housing 12 and the restriction of the shielding frame 246, and is thus carried out of the inner housing 12 during pressure relief, reducing the impact of the leakage of the environmental protection gas on the insulation. The top end of the second spring 233 is rotatably connected to the inner sealing plate 232 through a ring-shaped member, so that when the inner sealing plate 232 is pushed up by the pressure, the impeller 241 and the square rod 242 can be driven through the inner sealing plate 232, and the edge of the inner sealing plate 232 does not rub against the inner tube 231, ensuring the sealing performance when the inner sealing plate 232 is closed.

[0046] Working principle: When a continuous arc occurs in the load switch inside the inner housing 12, the temperature inside the inner housing 12 rises and the environmental protection gas decomposes, resulting in a significant increase in the air pressure inside the inner housing 12. At this time, under the action of the air pressure, the inner sealing plate 232 is pushed up. The air flow sprays out from the inner tube 231 and passes through the impeller 241, driving the impeller 241 to rotate. The rotation of the impeller 241 drives the inner sealing plate 232, the square rod 242 and one of the toothed rings 243 to rotate. Through this toothed ring 243 and the gear 245, the remaining toothed rings 243 are driven to rotate, so that the vanes 244 rotate to convey the environmental protection gas below upward, replacing the gas near the closing point of the load switch;

[0047] The gas discharged later enters the upper chamber through the installation shell 21. As the environmentally friendly gas inside the inner shell 12 is continuously discharged, the concentration of the environmentally friendly gas gradually decreases, the insulation property deteriorates, and the pressure inside the inner shell 12 gradually decreases. The pressure sensor 14 detects the pressure inside the inner shell 12 to activate the electric telescopic rod 31 to continuously expand and contract. The contraction of the electric telescopic rod 31 drives the spring telescopic rod 374, the piston plate 35, and the piston rod 373 to move, reducing the pressure inside the discharge cylinder 371 and the delivery cylinder 32. At this time, the check valve III 372 and the check valve I 33 open, and the gases in the heptafluoroisobutyronitrile chamber and the carbon dioxide chamber are respectively sucked into the discharge cylinder 371 and the delivery cylinder 32. Then, when the electric telescopic rod 31 extends to drive the piston plate 35 and the piston rod 373 to move, the pressure inside the discharge cylinder 371 and the delivery cylinder 32 increases simultaneously. At this time, due to the existence of the spring telescopic rod 374, when the piston plate 35 is affected by the gas pressure inside the delivery cylinder 32, it will move in the direction away from the check valve I 33 relative to the piston rod 373, and the spring telescopic rod 374 is compressed. The increasing speed of the carbon dioxide gas pressure between the delivery cylinder 32 and the discharge cylinder 371 is less than the increasing speed of the heptafluoroisobutyronitrile gas pressure inside the discharge cylinder 371. Therefore, as the piston rod 373 and the piston plate 35 move, the gas inside the discharge cylinder 371 will be ejected from the pores of the discharge cylinder 371 under pressure, forming multiple airflows to mix fully with the carbon dioxide inside the delivery cylinder 32, improving the mixing uniformity. At the same time, when the piston rod 373 moves, it drives the discharge cylinder 371 to rotate through the chute and the spiral protrusion 38, changing the ejection position of the heptafluoroisobutyronitrile gas, improving the mixing uniformity of the two gases and accelerating the mixing rate. During the above process, the sealing ring 362 blocks the check valve II 34. Therefore, after the pressure inside the delivery cylinder 32 increases, the gas will not be ejected from the check valve II 34;

[0048] When the piston plate 35 drives the inclined block 361 fixed to it to push the inclined block 361 on the sealing ring 362, the sealing ring 362 deflects, and the opening at the top of the sealing ring 362 communicates with the check valve II 34. At this time, the sealing ring 362 no longer blocks the check valve II 34. The pressurized and evenly mixed environmentally friendly gas inside the delivery cylinder 32 pushes open the check valve II 34 and is ejected into the inner shell 12. While restoring the concentration of the environmentally friendly gas inside the inner shell 12, a high-speed airflow is generated to extinguish the arc and contain the faults of the load switch.

[0049] The above is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical concept of the present invention, makes equivalent substitutions or changes, and should be covered within the protection scope of the present invention.

Claims

1. A primary-secondary fusion ring network box, comprising a ring network box body (10), wherein an outer shell (11) is fixedly connected to the inside of the ring network box body (10), an inner shell (12) is fixedly connected to the inside of the outer shell (11), a partition (13) is fixedly connected between the outer shell (11) and the inner shell (12) for dividing the space between the outer shell (11) and the inner shell (12) into two upper and lower chambers, and a pressure sensor (14) is installed on the outside of the inner shell (12), characterized in that: Also includes: A pressure relief mechanism (20) for releasing the pressure in the inner casing (12); A conveying mechanism (30), the conveying mechanism (30) comprising an electric telescopic rod (31) fixedly mounted on the inner wall of the outer shell (11) and a conveying cylinder (32) connected to the lower chamber, a piston plate (35) being slidably connected inside the conveying cylinder (32), a one-way valve (33) being fixedly mounted on one end of the conveying cylinder (32), a one-way valve (34) being fixed between the conveying cylinder (32) and the inner shell (12), and a pressure-maintaining component (36) and an air-jet component (37) being arranged inside the conveying cylinder (32); During the process of gas delivery by the piston plate (35), the second one-way valve (34) is temporarily blocked by the pressure-maintaining component (36), so that the gas inside the delivery cylinder (32) is pressurized and then sprayed into the inner shell (12); The pressure-maintaining assembly (36) comprises a sealing ring (362) rotatably connected to the interior of the conveying cylinder (32), a tension spring (363) is fixed between the sealing ring (362) and the inner wall of the conveying cylinder (32), and an inclined block (361) is fixedly connected to the opposite side of the sealing ring (362) and the piston plate (35); The jet assembly (37) comprises a discharge cylinder (371) rotatably connected to the inside of the conveying cylinder (32) and penetrating the piston plate (35); a check valve three (372) is fixedly installed at one end of the discharge cylinder (371); a piston rod (373) fixed to the telescopic end of the electric telescopic rod (31) is movably connected inside the discharge cylinder (371); a spring telescopic rod (374) is fixedly connected between the piston plate (35) and the telescopic end of the electric telescopic rod (31); and a lower chamber is divided into a heptafluoroisobutyronitrile chamber and a carbon dioxide chamber, which are respectively connected to the check valve three (372) and the check valve one (33); The piston rod (373) has an edge provided with a slide groove, and the inner wall of the discharge cylinder (371) has a spiral protrusion (38) embedded in the slide groove of the piston rod (373). When the piston rod (373) moves, the slide groove and the spiral protrusion (38) drive the discharge cylinder (371) to rotate; The pressure relief mechanism (20) comprises a mounting shell (21) fixedly connected to the top of the inner shell (12); a pressure balancing unit (22) and a pressure relief assembly (23) are arranged inside the mounting shell (21); the pressure balancing unit (22) comprises an outer sealing plate (221) slidably connected to the inside of the mounting shell (21); a spring (222) is arranged between the outer sealing plate (221) and the mounting shell (21).

2. The primary and secondary fusion ring network box according to claim 1 is characterized in that: The pressure relief assembly (23) comprises an inner tube (231) fixed on an outer sealing plate (221), the inner tube (231) is slidably connected with an inner sealing plate (232), and a second spring (233) is provided between the inner sealing plate (232) and the inner tube (231).

3. The primary and secondary fusion ring network box according to claim 2 is characterized in that: An air homogenizing mechanism (24) is provided inside the inner shell (12), the air homogenizing mechanism (24) comprising a shielding frame (246) fixed to the inner top wall of the inner shell (12), a plurality of toothed rings (243) are rotatably connected inside the inner shell (12), and blades (244) are fixedly connected to the inner walls of the toothed rings (243).

4. The primary and secondary fusion ring network box according to claim 3 is characterized in that: The inner shell (12) is internally rotatably connected to a gear (245) that is transmission-connected to the gear ring (243); the shielding frame (246) is internally rotatably connected to the gear ring (243); and the top and bottom of the inner sealing plate (232) are respectively fixedly connected to an impeller (241) and a square rod (242) that passes through the gear ring (243).

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