Primary and secondary fusion ring main unit

Abstract

The invention discloses a primary and secondary fusion ring main unit, and relates to the technical field of ring main units, the primary and secondary fusion ring main unit comprises a ring main unit body, an outer shell is fixedly connected in the ring main unit body, and an inner shell is fixedly connected in the outer shell; a partition plate used for dividing the space between the outer shell and the inner shell into an upper cavity and a lower cavity is fixedly connected between the outer shell and the inner shell, a pressure sensor is installed on the outer portion of the inner shell, and a pressure relief mechanism used for releasing pressure in the inner shell is further included. The conveying mechanism comprises an electric telescopic rod fixedly installed on the inner wall of the outer shell, environment-friendly gas in the lower cavity is conveyed into the inner shell through the conveying mechanism, the concentration of the environment-friendly gas in the inner shell is recovered, the insulation performance of the interior of the inner shell is improved, in addition, the environment-friendly gas can be sprayed into the interior of the inner shell under a certain pressure, and the environment-friendly gas can be sprayed into the inner shell under a certain pressure. And high-speed air flow is formed, strong arc blowing force is generated, arc extinguishing is accelerated, a contact of the load switch and other parts are protected from being ablated by the arc, and expansion of faults is restrained.

Description

Technical Field

[0001] The present invention relates to the technical field of ring network boxes, and in particular to a primary and secondary fused ring network box. Background Art

[0002] The primary and secondary integrated ring network box is a highly integrated power equipment for smart distribution networks. It is a compact, intelligent and efficient distribution unit built by deeply integrating the traditional decentralized primary equipment with the secondary equipment. The primary equipment is the core carrier of power transmission and distribution. The primary and secondary integrated ring network box includes key components such as circuit breakers, load switches, and grounding switches; the secondary equipment includes DTU terminals, various sensors, and communication modules. The primary equipment is responsible for directly producing, transmitting and distributing electric energy, while the secondary equipment monitors, controls, protects and regulates the primary equipment. When a fault is detected, the secondary equipment issues a command to allow the circuit breaker in the primary equipment to quickly cut off the current to protect the line and equipment. The two work closely together to ensure the stable, safe and efficient operation of the primary and secondary integrated ring network box and even the entire power system.

[0003] When the load switch in the primary and secondary fusion ring network box breaks the current, an arc will be generated. In order to extinguish the arc in a short time when the circuit is cut off and avoid the continuous burning of the arc causing damage to the equipment and lines, 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 arc is extinguished by using the insulating capacity of the environmentally friendly mixed gas.

[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 cause the pressure in the chamber where the load switch is located to rise sharply, causing the switch casing to deform and rupture, and even cause serious accidents such as explosions. In order to avoid this situation, the existing ring network box usually installs a pressure relief valve on the switch casing. When the pressure inside the chamber reaches a certain threshold, the pressure relief valve automatically opens to release excess gas. However, with the continuous decomposition and leakage of the environmentally friendly mixed gas in the chamber, the concentration of the environmentally friendly mixed gas will drop significantly, resulting in reduced insulation performance in the chamber, and the fault of the load switch is difficult to contain, which can easily lead to further aggravation of the fault and cause large-scale damage to the ring network box. Summary of the invention

[0005] The purpose of the present invention is to solve the problem that when a load switch of a ring network box fails, as the environmentally friendly mixed gas in the chamber where the load switch is located continues to decompose and leak, the concentration of the environmentally friendly mixed gas will significantly decrease, resulting in reduced insulation performance in the chamber, and the failure of the load switch is difficult to contain, which can easily lead to further aggravation of the failure. A primary and secondary fusion ring network box is proposed.

[0006] In order to achieve the above-mentioned purpose, the present invention adopts the following technology: a primary and secondary fusion ring network box, comprising a ring network box body, the inner part of the ring network box body is fixedly connected to an outer shell, the inner part of the outer shell body is fixedly connected to an inner shell, a partition for dividing the space between the outer shell body and the inner shell body into two upper and lower chambers is fixedly connected between the outer shell body and the inner shell body, a pressure sensor is installed on the outside of the inner shell body, and further comprising:

[0007] a pressure relief mechanism for releasing pressure in the inner casing;

[0008] The conveying mechanism comprises an electric telescopic rod fixedly mounted on the inner wall of the outer shell and a conveying cylinder connected to the lower chamber, a piston plate is slidably connected inside the conveying cylinder, a one-way valve 1 is fixedly mounted on one end of the conveying cylinder, a one-way valve 2 is fixed between the conveying cylinder and the inner shell, and a pressure-maintaining component and an air-jet component are arranged inside the conveying cylinder;

[0009] During the process of gas delivery by the piston plate, the second one-way valve is temporarily blocked by the pressure-maintaining component, so that the gas inside the delivery cylinder is pressurized and then sprayed into the inner shell.

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

[0011] As a further description of the above technical solution: the jet assembly includes a discharge cylinder rotatably connected to the inside of the conveying cylinder and passing through the piston plate, a one-way valve three is fixedly installed at one end of the discharge cylinder, a piston rod fixed 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 are respectively connected to the one-way valve three and the one-way valve one.

[0012] As a further description of the above technical solution: a slide groove is provided on the edge of the piston rod, and a spiral protrusion is provided on the inner wall of the discharge cylinder which is embedded in the slide groove of the piston rod. When the piston rod moves, the discharge cylinder is driven to rotate through the slide groove and the spiral protrusion.

[0013] As a further description of the above technical solution: the pressure relief mechanism includes a mounting shell fixedly connected to the top of the inner shell body, a pressure balancing unit and a pressure relief assembly are arranged inside the mounting shell, the pressure balancing unit includes an outer sealing plate slidably connected to the inside of the mounting shell, and a spring is arranged between the outer sealing plate and the mounting 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] The pressure balancing unit can balance the gas pressure with the help of the internal space of the installation shell when the temperature inside the inner shell changes, so that when there is a small pressure change inside the inner shell, the environmental gas can remain stable, thereby ensuring the insulation inside the inner shell, avoiding gas breakdown when the load switch in the ring network box is in use, and enhancing the safety performance of the ring network box. When the load switch inside the inner shell fails and the pressure inside the inner shell increases significantly, the gas can be leaked through the pressure relief component, and the blades are driven to rotate with the help of airflow thrust to disperse the environmental gas decomposed at the closing point of the load switch, so that the undecomposed environmental gas is filled around the closing point, thereby strengthening the insulation around the closing point, ensuring the safe operation of the equipment and improving the power supply reliability. At the same time, the dispersed gas is more easily discharged through the pressure relief mechanism under the shielding of the shielding frame, thereby reducing the impact of gas leakage on the insulation performance inside the inner shell. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0023] Figure 3 A schematic diagram of an outer shell provided according to an embodiment of the present invention is shown;

[0024] Figure 4 A schematic cross-sectional view of an outer shell provided in an embodiment of the present invention is shown;

[0025] Figure 5 A schematic diagram of a telescopic rod provided according to an embodiment of the present invention is shown;

[0026] Figure 6 A schematic cross-sectional view of a conveying cylinder provided according to an embodiment of the present invention is shown;

[0027] Figure 7 A schematic diagram of a sealing ring provided according to an embodiment of the present invention is shown;

[0028] Figure 8 A schematic cross-sectional view of a discharge cylinder provided according to an embodiment of the present invention is shown;

[0029] Fig. 9 A schematic diagram of the interior of an inner shell provided according to an embodiment of the present invention is shown;

[0030] Fig.10 A schematic cross-sectional view of a mounting shell provided according to an embodiment of the present invention is shown;

[0031] Fig.11 The embodiment of the present invention provides Fig.10Enlarged view of point A in the middle.

[0032] Legend:

[0033] 10. Ring network box; 11. Outer shell; 12. Inner shell; 13. Partition plate; 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 assembly; 231. Inner tube; 232. Inner sealing plate; 233. Spring 2; 24. Air equalization mechanism; 241. Impeller; 242. Square rod; 243. Gear ring; 244. Blade; 245. Gear; 246. Shielding frame;

[0035] 30. Conveying mechanism; 31. Electric telescopic rod; 32. Conveying cylinder; 33. One-way valve 1; 34. One-way valve 2; 35. Piston plate; 36. Pressure-maintaining assembly; 361. Bevel block; 362. Sealing ring; 363. Tension spring; 37. Jet assembly; 371. Discharge cylinder; 372. One-way valve 3; 373. Piston rod; 374. Spring telescopic rod; 38. Spiral protrusion. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technology of the one-second fusion ring network box in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] like Figure 1-Figure 11 As shown, the present invention provides a primary and secondary fusion ring network box: comprising a ring network box body 10, the inner part of the ring network box body 10 is fixedly connected to an outer shell 11, the inner part of the outer shell 11 is fixedly connected to an inner shell 12, and 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, the upper and lower chambers are respectively used to store the leaked exhaust gas and the spare environmental protection gas, and the outer part of the inner shell 12 is installed with a pressure sensor 14, and also includes:

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

[0039] The conveying mechanism 30 includes 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 is slidably connected to the interior of the conveying cylinder 32. A one-way valve 1 33 is fixedly mounted on one end of the conveying cylinder 32. A one-way valve 2 34 is fixed between the conveying cylinder 32 and the inner shell 12. When the pressure sensor 14 detects that the pressure inside the inner shell 12 drops, the electric telescopic rod 31 is opened. When the electric telescopic rod 31 is extended, the piston plate 35 is driven to move. The one-way valve 34 is opened. One-way valve 33 is closed, one-way valve 2 34 is opened, so that the environmentally friendly gas inside the delivery cylinder 32 is delivered to the inner shell 12 through one-way valve 2 34, thereby increasing the concentration of environmentally friendly gas inside the inner shell 12 and curbing the expansion of the fault. When the electric telescopic rod 31 contracts and drives the piston plate 35 to move, one-way valve 1 33 is opened, one-way valve 2 34 is closed, and the gas in the lower chamber is sucked into the delivery cylinder 32 through one-way valve 1 33, thereby realizing the continuous delivery of gas. The delivery cylinder 32 is provided with a pressure-maintaining component 36 and an injection component 37;

[0040] During the process of gas delivery by the piston plate 35, the 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 sprayed environmentally friendly gas forms a high-speed airflow, which generates a strong arc blowing force, accelerates the extinction of the arc, protects the contacts and other components of the load switch from arc erosion, and curbs the expansion of the fault.

[0041] Reference 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 8The lower chamber is divided into a heptafluoroisobutyronitrile chamber and a carbon dioxide chamber. The two chambers are used to store spare heptafluoroisobutyronitrile and carbon dioxide respectively. When a load switch fails inside the inner shell 12, the mixture is used to form an environmentally friendly gas and fill it into the inner shell 12 to curb the expansion of the failure. The purpose of separate storage is to facilitate the management and maintenance of the two gases. In order to make the two gases quickly and evenly mixed before being transported to the inner shell 12, the jet assembly 37 includes a discharge cylinder 371 rotatably connected to the inside of the delivery cylinder 32 and passing through the piston plate 35. A one-way valve 372 is fixedly installed at one end of the discharge cylinder 371. The interior of the discharge cylinder 371 is movably connected to a piston rod 373 fixed to the telescopic end of the electric telescopic rod 31. The piston A spring telescopic rod 374 is fixedly connected between the plate 35 and the telescopic end of the electric telescopic rod 31. The heptafluoroisobutyronitrile chamber and the carbon dioxide chamber are respectively connected to the one-way valve three 372 and the one-way 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 one-way valve one 33 and the one-way valve three 372 are opened, and the gas in the heptafluoroisobutyronitrile chamber and the carbon dioxide chamber is sucked into the discharge cylinder 371 and the conveying cylinder 32 respectively. When the electric telescopic rod 31 is extended to drive the piston plate 35 and the piston rod 373 to move, the internal pressures of the discharge cylinder 371 and the conveying cylinder 32 increase at the same time. At this time, due to the existence of the spring telescopic rod 374, the piston plate 35 is acted upon by the internal gas pressure of the conveying cylinder 32 When in use, it will move relative to the piston rod 373 in the direction away from the one-way valve 33, so that the spring telescopic rod 374 is compressed, and the increase rate of the carbon dioxide gas pressure between the delivery cylinder 32 and the discharge cylinder 371 is lower than the increase rate 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 air holes of the discharge cylinder 371 under pressure, forming multiple air flows that are fully mixed with the carbon dioxide inside the delivery cylinder 32 to improve the uniformity of the mixing. The maximum relative movement distance of the piston rod 373 and the piston plate 35 is smaller than the width of the piston plate 35, in order to prevent the piston rod 373 from escaping from the piston plate 35, resulting in the misalignment of the two and causing the gas to pass through. The air hole of the discharge cylinder 371 enters the side of the piston plate 35 close to the electric telescopic rod 31, and a slide groove is provided on the edge of the piston rod 373. The inner wall of the discharge cylinder 371 is provided with a spiral protrusion 38 embedded in the slide groove of the piston rod 373. When the piston rod 373 moves, the discharge cylinder 371 is driven to rotate through the slide groove and the spiral protrusion 38. Therefore, in the process of the piston rod 373 moving to inhale and deliver air, the discharge cylinder 371 will rotate. The rotation of the discharge cylinder 371 can not only drive the flow of internal and external airflows and accelerate the mixing of airflows, but also can continuously change the position of the air holes thereon, so that the position where the gas inside the discharge cylinder 371 is ejected changes continuously, further improving the uniformity of the mixing of the two gases and accelerating the mixing rate.

[0043] Reference Fig.10 and Fig.11When the load switch inside the inner shell 12 does not fail, changes in the external temperature will cause a small change in the air pressure inside the inner shell 12. At this time, the environmentally friendly gas inside the inner shell 12 has not decomposed, so there is no need to leak it. In order to balance the internal pressure of the inner shell 12 without leaking the environmentally friendly gas and ensure the insulation of the environmentally friendly gas inside the inner shell 12, the pressure relief mechanism 20 includes a mounting shell 21 fixedly connected to the top of the inner shell 12 and connected to the upper chamber. A pressure balancing unit 22 and a pressure relief assembly 23 are arranged inside the mounting shell 21. The pressure balancing unit 22 includes 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. Under the pressure of the environmentally friendly gas, the outer sealing plate 221 will slide inside the mounting shell 21, so that the space connecting the mounting shell 21 and the inner shell 12 changes, thereby balancing the air pressure of the environmentally friendly gas inside the inner shell 12.

[0044] The pressure relief assembly 23 includes an inner tube 231 fixed on the outer sealing plate 221, and the inner tube 231 is slidably connected with an inner sealing plate 232. A spring 233 is provided between the inner sealing plate 232 and the inner tube 231. When a load switch inside the inner shell 12 fails and the air pressure inside the inner shell 12 increases significantly, the outer sealing plate 221 is lifted 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 shell 12 leaks out from the inner tube 231, thereby avoiding excessive pressure inside the inner shell 12, which may aggravate the damage to the load switch and prevent the inner shell 12 from being damaged under pressure.

[0045] Reference Fig. 9 and Fig.10In order to disperse the decomposed environmental gas near the closing point of the switch when a load switch fails, maintain the insulation near the closing point to prevent the fault from continuing to expand, an air-uniform mechanism 24 is arranged inside the inner shell 12, and the air-uniform mechanism 24 includes a shielding frame 246 fixed to the top wall inside the inner shell 12, and the inner shell 12 is rotatably connected to a plurality of toothed rings 243, and the inner wall of the toothed ring 243 is fixedly connected to blades 244, and the inner shell 12 is rotatably connected to a gear 245 that is transmission-connected between the toothed rings 243, and the shielding frame 246 is rotatably connected to the toothed ring 243. 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 toothed ring 243. The leaked gas passes through the impeller 241 to drive it to rotate, and the rotation of the impeller 241 drives the inner sealing plate 232, the square rod 242 that passes through the toothed ring 243, and the square rod 242 that passes through the toothed ring 243 drives the inner sealing plate 232, ... the square rod 242 that passes through the toothed ring 243 drives the inner sealing plate 232, the square rod 242 that passes through the toothed ring 243 drives the inner sealing plate 232, the square rod 242 that passes through the toothed ring 243 drives the inner sealing plate 232, the square rod 2 The rod 242 and one of the toothed rings 243 rotate, thereby driving the remaining toothed rings 243 to rotate through the gear 245, so that the blades 244 rotate to transport the environmentally friendly gas below upward and replace the gas near the closing point of the load switch. In this process, the decomposed environmentally friendly gas flows upward, and is more easily close to the mounting shell 21 after being restricted by the guide of the top wall inside the inner shell 12 and the shielding frame 246, so that it is brought out of the inner shell 12 during pressure relief, reducing the impact of the leakage of environmentally friendly gas on the insulation. The top of the spring 233 is rotatably connected to the inner sealing plate 232 by fixing a ring part, so that when the inner sealing plate 232 is lifted by pressure, the impeller 241 and the square rod 242 can be driven by the inner sealing plate 232, and the edge of the inner sealing plate 232 does not rub against the inner tube 231, thereby ensuring the sealing of the inner sealing plate 232 when it is closed.

[0046] Working principle: When a load switch fails inside the inner housing 12, a continuous arc is generated, which increases the temperature inside the inner housing 12 and decomposes the environmentally friendly gas, causing the internal air pressure of the inner housing 12 to increase significantly. At this time, under the action of the air pressure, the inner sealing plate 232 is pushed upward, and the airflow is ejected from the inner tube 231 and passes through the impeller 241, driving the impeller 241 to rotate, so that the impeller 241 drives the inner sealing plate 232, the square rod 242 and one of the gear rings 243 to rotate, and the remaining gear rings 243 are driven to rotate through the gear ring 243 and the gear 245, so that the blades 244 rotate to transport the environmentally friendly gas below upward, replacing the gas near the closing point of the load switch;

[0047] After that, the leaked gas enters the upper chamber through the mounting shell 21. As the environmentally friendly gas inside the inner shell 12 is continuously leaked, the concentration of the environmentally friendly gas gradually decreases, the insulation decreases, and the internal pressure of the inner shell 12 gradually decreases. The pressure sensor 14 detects the internal pressure of the inner shell 12 to start the electric telescopic rod 31 to continuously extend and retract. 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, so that the internal pressure of the discharge cylinder 371 and the conveying cylinder 32 is reduced. At this time, the one-way valve three 372 and the one-way valve one 33 are opened, and the gas in the heptafluoroisobutyronitrile chamber and the carbon dioxide chamber are respectively sucked into the discharge cylinder 371 and the conveying cylinder 32. After that, when the electric telescopic rod 31 is extended to drive the piston plate 35 and the piston rod 373 to move, the internal pressure of the discharge cylinder 371 and the conveying cylinder 32 increases at the same time. At this time, due to the existence of the spring telescopic rod 374, the piston plate 35 is affected by the internal gas of the conveying cylinder 32. When pressure acts, it will move relative to the piston rod 373 in the direction away from the one-way valve 1 33, the spring telescopic rod 374 is compressed, and the increase rate of the carbon dioxide gas pressure between the delivery cylinder 32 and the discharge cylinder 371 is lower than the increase rate of the heptafluoroisobutyronitrile gas pressure inside the discharge cylinder 371. Therefore, with the movement of the piston rod 373 and the piston plate 35, the gas inside the discharge cylinder 371 will be ejected from the air holes of the discharge cylinder 371 under pressure, forming multiple air flows that are fully mixed with the carbon dioxide inside the delivery cylinder 32 to improve the uniformity of the mixing. At the same time, when the piston rod 373 moves, the discharge cylinder 371 is driven to rotate through the slide groove and the spiral protrusion 38, changing the ejection position of the heptafluoroisobutyronitrile gas, improving the uniformity of the mixing of the two gases and accelerating the mixing rate. In the above process, the sealing ring 362 blocks the one-way valve 2 34. Therefore, after the internal pressure of the delivery cylinder 32 increases, the gas will not be ejected from the one-way valve 2 34.

[0048] When the piston plate 35 drives the inclined block 361 fixed thereto to push the inclined block 361 on the sealing ring 362, the sealing ring 362 deflects, and the opening on 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 and evenly mixed environmentally friendly gas inside the conveying cylinder 32 pushes the one-way valve 34 open and then sprays into the inner shell 12, thereby restoring the environmentally friendly gas concentration inside the inner shell 12 and generating a high-speed airflow to extinguish the arc, thereby curbing the failure of the load switch.

[0049] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field within the technical scope disclosed by the present invention, according to the technology of the present invention a primary and secondary fusion ring network box and its inventive concept, make equivalent replacement or change, 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).

2. The primary and secondary fusion ring network box according to claim 1 is characterized in that: 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 sides of the sealing ring (362) and the piston plate (35).

3. The primary and secondary fusion ring network box according to claim 1, characterized in that: 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).

4. The primary and secondary fusion ring network box according to claim 3 is characterized in that: 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.

5. The primary and secondary fusion ring network box according to claim 1, characterized in that: 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).

6. The primary and secondary fusion ring network box according to claim 5, 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).

7. The primary and secondary fusion ring network box according to claim 6, 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).

8. The primary and secondary fusion ring network box according to claim 7, 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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