Ring main unit pressure relief device and ring main unit

Abstract

The invention provides a ring main unit pressure relief device and a ring main unit, and relates to the technical field of ring main units. The ring main unit pressure relief device comprises an energy dissipation mechanism, the energy dissipation mechanism comprises a shell, a primary energy dissipation assembly, a secondary energy dissipation assembly and a plurality of protection assemblies, high-pressure gas generated in a ring main unit is guided through an arc-shaped and axial-radiation gas flow channel in the upper portion of the primary energy dissipation assembly, and the primary energy dissipation assembly can rise and rotate while being impacted; the energy in the airflow is consumed by utilizing the movement; the secondary energy consumption assembly unloads the rising action of the primary energy dissipation assembly by utilizing the elastic displacement of the secondary energy dissipation assembly, so that the primary energy dissipation assembly is prevented from rising rapidly; the protection assembly buffers the displacement of the end socket through the elastic displacement of the protection assembly, and secondary buffering is conducted on the rising action of the primary energy dissipation assembly. Due to the elastic displacement capacity in the secondary energy dissipation assembly and the protection assembly, the primary energy dissipation assembly can automatically reset after gas generated in the ring main unit is exhausted, and the repeated use effect is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of ring main unit, and in particular to a ring main unit pressure relief device and a ring main unit. Background Art

[0002] During the operation of the ring network cabinet, a short circuit fault may occur in the primary circuit due to various reasons (such as short circuit, insulation aging, human operation error, etc.). Under the short-circuit current of tens of thousands of amperes, high-temperature and high-pressure gas is instantly generated. If the high-temperature and high-pressure gas cannot be effectively released in a very short time in the narrow cabinet, it will cause the switch cabinet to explode and damage the adjacent switch cabinets. At the same time, it may endanger personal safety. Therefore, effective pressure relief measures must be considered when designing the switch cabinet. The pressure relief device on the existing ring network cabinet is mostly a simple iron sheet package, and one side of the iron sheet is fixed with plastic screws. This is convenient for the ring network cabinet to fail due to various reasons. When high-temperature and high-pressure gas is instantly generated, the airflow is discharged through the pressure relief channel (iron sheet). The side of the iron sheet fixed with plastic screws is lifted up to allow the airflow to be discharged smoothly. The other side of the iron sheet is fixed with metal screws to avoid fixing the iron sheet when the airflow lifts the iron plate, so as to avoid the iron sheet flying out and causing safety accidents.

[0003] However, after the plastic screws break under the action of pressure, the iron sheet will be lifted up suddenly under the pressure. Firstly, the lifting action of the iron sheet is rapid, and under the action of inertia, it is easy to tear the ring network cabinet near the pressure relief channel, or cause damage to objects near the pressure relief channel; secondly, the pressure relief channel designed in this way, once the pressure relief action occurs, the iron sheet is difficult to reuse, and the iron sheet needs to be replaced to reseal the pressure relief channel, which brings a certain burden to the maintenance work and also causes a certain waste of resource utilization. Summary of the invention

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, in the first aspect, the present application proposes a ring network cabinet pressure relief device, which is arranged at a position corresponding to the pressure relief channel of the ring network cabinet, and includes an energy dissipation mechanism, wherein the energy dissipation mechanism includes a shell, a primary energy dissipation component, a secondary energy dissipation component and a plurality of protective components, wherein the shell is fixedly connected to the ring network cabinet, and the shell is two upper and lower connected cylindrical structures, wherein the diameter of the lower cylindrical structure is smaller than the diameter of the upper cylindrical structure, wherein a hollow support is provided at the bottom end of the lower cylindrical structure; the primary energy dissipation component is sealed and plugged into the shell, wherein the primary energy dissipation component is divided into an upper and lower part, wherein the lower part is coupled with the lower cylindrical structure of the shell, and an open and closed state is formed between the upper part and the upper cylindrical structure of the shell, wherein the upper and lower parts of the primary energy dissipation component are provided with connected airflow channels, wherein the airflow channel of the upper part is arc-shaped and radiates to the surrounding side; the secondary energy dissipation component includes a slide cylinder, a slide rod, a sealing The sliding cylinder is fixedly connected to the upper part of the primary energy dissipation component, the sliding rod is rotatably connected to the hollow support of the lower cylinder of the shell, the sliding rod seal is slidably inserted in the sliding cylinder, the head is fixedly connected to one end of the sliding rod inserted in the sliding cylinder, a distance is left between the peripheral side of the head and the inner wall of the sliding cylinder, the floating ring seal is slidably sleeved on the sliding rod, the floating ring and the inner wall of the sliding cylinder seal and slide in cooperation, the sliding cylinder is filled with hydraulic oil on the side of the floating ring facing the head, and the sliding cylinder is filled with compressed gas on the side of the floating ring away from the head; multiple protective components are seal-slidably inserted in the head, multiple protective components are evenly distributed circumferentially on the head, both ends of the protective components extend out of the head, and the protective components have elastic displacement in the head.

[0005] Preferably, the lower cylindrical structure of the shell is a small-diameter straight cylinder, and the upper cylindrical structure of the shell is a large-diameter straight cylinder. The small-diameter straight cylinder and the large-diameter straight cylinder are coaxially fixed, and a convex ring is coaxially fixed to the outer wall of the large-diameter straight cylinder, and a plurality of through holes are evenly arranged on the convex ring in a circumferential direction. The bottom end of the small-diameter straight cylinder is coaxially fixed to a base, and two limiting rings with different diameters are coaxially fixed to the upper end surface of the base, and an annular slideway is formed between the two limiting rings with different diameters, and the bottom end of the small-diameter straight cylinder is a hollow support, and a plurality of through holes are evenly arranged on the hollow support in a circumferential direction.

[0006] Preferably, the lower part of the primary energy dissipation component is an extension tube, and the upper part of the primary energy dissipation component is a coaxially arranged horn, a plurality of arc-shaped blades and a top guide plate, the extension tube is coaxially arranged in the small-diameter straight tube and the two are coupled, the horn is coaxially fixed to the top end of the extension tube and is located in the large-diameter straight tube, the plurality of arc-shaped blades are circumferentially evenly fixed to the open end of the horn, and the top guide plate is coaxially fixed to the side of the plurality of arc-shaped blades away from the horn.

[0007] Preferably, the outer edge of the lower end surface of the top guide plate is arranged to be an arc, and an annular channel is formed between the open end of the horn and the arc of the lower end surface of the top guide plate, and the cross-section of the annular channel is an arc with a larger bottom and a smaller top, and a plurality of the arc blades divide the annular channel into an upper airflow channel.

[0008] Preferably, the air flow channel at the upper part of the primary energy dissipation component is closed or opened by the large-diameter straight cylinder.

[0009] Preferably, the interior of the head is hollow, and a plurality of arc strips are evenly fixed on the side wall of the head in a circumferential direction. The plurality of arc strips and the inner wall of the slide tube are slidably matched, and the plurality of arc strips form a plurality of arc flow channels between the head and the slide tube for the circulation of hydraulic oil.

[0010] Preferably, one end of the slide rod extending out of the slide cylinder is coaxially fixed with a first rotating seat, and the first rotating seat is coaxially fixed to a hollow support at the bottom end of the small-diameter straight cylinder.

[0011] Preferably, the protection assembly includes a guide rod, a positioning ring and a protection spring, the guide rod sealingly slides through the head; the positioning ring is fixedly sleeved on the portion of the guide rod located on the head; the protection spring is sleeved on the guide rod.

[0012] Preferably, one end of the protection spring abuts against the upper end surface of the positioning ring, and the other end of the protection spring abuts against the inner top of the head.

[0013] According to a ring main unit pressure relief device of the present application, the beneficial effects are:

[0014] 1. The arc-shaped and axially radiating airflow channel on the upper part of the primary energy dissipation component is used to guide the high-temperature and high-pressure gas instantly generated in the ring network cabinet. During this process, the primary energy dissipation component will rise and rotate at the same time due to the impact, and the movement of the primary energy dissipation component is used to consume the energy in the airflow;

[0015] 2. The secondary energy dissipation component uses its own elastic displacement to relieve the force of the primary energy dissipation component's upward movement, and uses the damping force generated inside itself to prevent the primary energy dissipation component from rising rapidly;

[0016] 3. The protective component uses its own elastic displacement to buffer the displacement of the head, preventing the impact force generated by high-pressure and high-temperature gas from causing the head to violently hit the floating ring, and at the same time provides secondary buffering for the rising action of the primary energy dissipation component;

[0017] 4. The elastic displacement capacity of the secondary energy consumption components and the protective components enables the primary energy dissipation components to automatically reset themselves after discharging the gas generated in the ring network cabinet, thus achieving the effect of reuse.

[0018] On the other hand, the present application further provides a ring main unit, comprising the above-mentioned ring main unit pressure relief device, and also comprising a cabinet body, wherein the energy consumption mechanism is fixedly connected to a position on the cabinet body corresponding to the pressure relief channel.

[0019] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the implementation methods of the present application, the drawings required for use in the implementation methods will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 is a schematic diagram of a ring main unit pressure relief device installed on a cabinet according to an embodiment of the present application;

[0022] Figure 2 It is a schematic diagram of the partial structure of a ring main unit pressure relief device and a cabinet according to an embodiment of the present application;

[0023] Figure 3 is a partial structural schematic diagram of an energy consumption mechanism according to an embodiment of the present application;

[0024] Figure 4 is a structural exploded diagram of an energy dissipation mechanism according to an embodiment of the present application;

[0025] Figure 5 is a cross-sectional view of an energy dissipation mechanism according to an embodiment of the present application Figure 1 ;

[0026] Figure 6 is a cross-sectional view of an energy dissipation mechanism according to an embodiment of the present application Figure 2 ;

[0027] Figure 7 is a cross-sectional view of an exhaust mechanism according to an embodiment of the present application and a schematic diagram of its position;

[0028] Figure 8 According to the embodiment of the present application Figure 7 A is an enlarged schematic diagram;

[0029] Fig. 9 The partial structure diagram of the exhaust mechanism according to the embodiment of the present application is shown in FIG. Figure 1 ;

[0030] Fig.10 The partial structure diagram of the exhaust mechanism according to the embodiment of the present application is shown in FIG. Figure 2 ;

[0031] Fig.11 is a schematic diagram of the structure and position of the adjustment mechanism according to an embodiment of the present application;

[0032] Fig.12 It is a schematic diagram of the partial structure of the adjustment mechanism according to an embodiment of the present application.

[0033] Icons: 1. Cabinet; 2. Energy dissipation mechanism; 21. Shell; 211. Small-diameter straight cylinder; 212. Large-diameter straight cylinder; 213. Convex ring; 214. Through hole; 215. Base; 216. Limiting ring; 217. Through hole; 22. Primary energy dissipation component; 221. Extension cylinder; 222. Horn; 223. Curved blade; 224. Top guide plate; 23. Secondary energy dissipation component; 231. Sliding cylinder; 232. Sliding rod; 233. Head; 234. Floating ring; 235. Curved strip; 236. First rotating seat; 24. Protection component; 241. Guide rod; 242, positioning ring; 243, protective spring; 3, exhaust mechanism; 31, lower cylinder; 311, inclined hole; 32, upper cylinder; 321, dome; 322, pressure relief hole; 33, rotating ring; 331, bevel ring; 332, arc-shaped sheet; 4, adjustment mechanism; 41, top pressure plate; 411, upper channel; 412, guide strip; 413, upper fixing ring; 42, adjustment assembly; 421, threaded cylinder; 422, adjustment bolt; 43, bottom pressure plate; 431, lower channel; 432, lower fixing ring; 44, adjustment spring; 45, second rotating seat. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0035] In order to make the purpose, technical solutions and advantages of the implementation methods of this application clearer, the technical solutions in the implementation methods of this application will be clearly and completely described below in conjunction with the drawings in the implementation methods of this application. Obviously, the described implementation methods are part of the implementation methods of this application, not all of the implementation methods. Based on the implementation methods in this application, all other implementation methods obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0036] like Figure 1-Figure 12 As shown, a ring main unit according to an embodiment of the present application includes a cabinet 1, and a pressure relief device of the ring main unit according to the embodiment of the present application is arranged at a position of the cabinet 1 corresponding to a pressure relief channel.

[0037] Embodiment 1, a ring main unit pressure relief device of the embodiment of the present application further includes an energy dissipation mechanism 2, the energy dissipation mechanism 2 includes a shell 21, a primary energy dissipation component 22, a secondary energy dissipation component 23 and a plurality of protection components 24, the shell 21 is fixedly connected to the cabinet 1 (specifically as Figure 1-Figure 3 shown).

[0038] like Figure 4-Figure 6 As shown, specifically, the shell 21 is a cylindrical structure with two upper and lower connections, the diameter of the lower cylindrical structure is smaller than the diameter of the upper cylindrical structure, wherein a hollow support is provided at the bottom end of the lower cylindrical structure, the lower cylindrical structure of the shell 21 is a small-diameter straight cylinder 211, and the upper cylindrical structure of the shell 21 is a large-diameter straight cylinder 212, the small-diameter straight cylinder 211 and the large-diameter straight cylinder 212 are coaxially fixed, and a convex ring 213 is coaxially fixed to the outer wall of the large-diameter straight cylinder 212, and a plurality of convex rings 213 are uniformly provided on the circumferential direction. A through hole 214 is formed, and a base 215 is coaxially fixed to the bottom end of the small-diameter straight cylinder 211. Two limiting rings 216 with different diameters are coaxially fixed to the upper end face of the base 215. An annular slideway is formed between the two limiting rings 216 with different diameters. The bottom end of the small-diameter straight cylinder 211 is a hollow support. A plurality of through openings 217 are evenly arranged circumferentially on the hollow support. The through openings 217 facilitate the high-temperature and high-pressure gas instantly generated inside the cabinet 1 to enter the shell 21 from here.

[0039] Among them, the primary energy dissipation component 22 is sealed and inserted into the shell 21, wherein the primary energy dissipation component 22 is divided into an upper and lower part, the lower part is coupled with the lower cylindrical structure of the shell 21, and the upper part and the upper cylindrical structure of the shell 21 form an open and closed state, and the upper and lower parts of the primary energy dissipation component 22 are provided with connected air flow channels, wherein the air flow channel of the upper part is arc-shaped and radiates to the surrounding side, specifically, the lower part of the primary energy dissipation component 22 is an extension tube 221, and the upper part of the primary energy dissipation component 22 is a coaxially arranged horn tube 222, a plurality of arc-shaped blades 223 and a top guide plate 224, the extension tube 221 is coaxially arranged in the small-diameter straight tube 211 and the two are coupled (the extension tube 221 can rotate and rise and fall in the small-diameter straight tube 211), the horn The tube 222 is coaxially fixed to the top of the extension tube 221 and is located in the large-diameter straight tube 212. A plurality of arc-shaped blades 223 are circumferentially uniformly fixed to the open end of the horn tube 222. The top guide plate 224 is coaxially fixed to the side of the plurality of arc-shaped blades 223 away from the horn tube 222. The outer edge of the lower end surface of the top guide plate 224 is set to an arc shape. An annular channel is formed between the open end of the horn tube 222 and the arc shape of the lower end surface of the top guide plate 224. The cross-section of the annular channel is an arc shape with a large bottom and a small top. The plurality of arc-shaped blades 223 divide the annular channel into an upper air flow channel. It can be seen that when the gas generated inside the cabinet 1 enters from the bottom end of the small-diameter straight tube 211, it will directly enter the horn tube 222 and rush into the plurality of air flow channels, such as Figure 5 and Figure 6 As shown, since the bottom end of the horn 222 is in the shape of a straight cylinder and is open at the top, the curved surface of the top guide plate 224 will change the original axial flow of the airflow into radial flow. Due to the effect of the curved blades 223, the airflow will generate thrust on the curved blades 223 during the radial flow, forcing the entire primary energy dissipation component 22 to rotate. At the same time, the entire primary energy dissipation component 22 will be synchronously displaced upward by the axial impact of the airflow. Since the airflow channel at the top of the primary energy dissipation component 22 is closed or opened by the large-diameter straight cylinder 212, the radial port of the airflow channel that was originally blocked by the inner wall of the large-diameter straight cylinder 212 is opened due to the upward displacement of the primary energy dissipation component 22, so that the airflow can smoothly flow through and be discharged from the primary energy dissipation component 22.

[0040] Another example Figure 4-Figure 6 As shown, the secondary energy dissipation component 23 in the embodiment of the present application includes a slide cylinder 231, a slide rod 232, a head 233 and a floating ring 234. The slide cylinder 231 is fixedly connected to the upper part of the primary energy dissipation component 22, the slide rod 232 is rotatably connected to the hollow cylindrical support at the bottom of the shell 21, the slide rod 232 is sealed and slidably inserted in the slide cylinder 231, the head 233 is fixedly connected to one end of the slide rod 232 inserted in the slide cylinder 231, and a gap is left between the peripheral side of the head 233 and the inner wall of the slide cylinder 231. The floating ring 234 is sealed and slidably sleeved on the slide cylinder 231. The rod 232, the floating ring 234 and the inner wall of the slide tube 231 are sealed and slidably matched, the slide tube 231 is filled with hydraulic oil on the side of the floating ring 234 facing the head 233, and the slide tube 231 is filled with compressed gas on the side of the floating ring 234 away from the head 233; multiple protection components 24 are sealed and slidably inserted into the head 233, and multiple protection components 24 are evenly distributed circumferentially on the head 233, and both ends of the protection components 24 extend out of the head 233, and the protection components 24 have elastic displacement in the head 233.

[0041] Specifically, the interior of the head 233 is hollow, and a plurality of arc strips 235 are evenly fixed to the side wall of the head 233 in a circumferential direction. The plurality of arc strips 235 and the inner wall of the slide cylinder 231 are slidably matched, and the plurality of arc strips 235 form a plurality of arc flow channels between the head 233 and the slide cylinder 231 for the circulation of hydraulic oil.

[0042] One end of the slide rod 232 extending out of the slide cylinder 231 is coaxially fixedly connected to a first rotating seat 236 , and the first rotating seat 236 is coaxially fixedly connected to a hollow support at the bottom end of the small-diameter straight cylinder 211 .

[0043] It can be understood that when the airflow impacts the energy dissipation component 22 and drives it to move upward, the top guide plate 224 will synchronously drive the slide 231 to move upward, so that the slide bar 232 and the head 233 will move downward relative to the slide 231. At this time, the hydraulic oil below the head 233 will flow upward through the arc-shaped flow channel between the arc-shaped strips 235. In this process, due to the smaller channel for liquid circulation, a certain resistance will be generated; secondly, in the process of the liquid flowing upward to the head 233, the arc-shaped strip 235 will generate a rotational force, causing the head 233 and the slide bar 232 to rotate at the same time. The action further generates kinetic energy consumption; and because the liquid generates resistance during the circulation on both sides of the head 233, the resistance will be applied to the floating ring 234 through the liquid, and there is compressed gas under the floating ring 234. Therefore, after the floating ring 234 is subjected to pressure from the direction of the hydraulic oil, the floating ring 234 will be forced to squeeze the compressed gas, and further resistance will be generated in this process. In this way, the triple resistance will be brought to the entire primary energy dissipation component 22 through the top guide plate 224, so that it can offset the impact of the airflow to a certain extent, and at the same time avoid it from rising rapidly after the impact, and to a certain extent alleviate the rising speed of the primary energy dissipation component 22.

[0044] It should be noted that, in the specific embodiment of the present application, fixing the slide tube 231 at the top of the top guide plate 224 will increase the weight of the primary energy dissipation component 22 and further enhance the consumption of airflow power by the primary energy dissipation component 22 .

[0045] like Figure 5 and Figure 6 As shown, the protection assembly 24 includes a guide rod 241, a positioning ring 242 and a protection spring 243. The guide rod 241 sealingly slides through the head 233; the positioning ring 242 is fixedly sleeved on the part of the guide rod 241 located at the head 233; the protection spring 243 is sleeved on the guide rod 241.

[0046] Specifically, one end of the protection spring 243 abuts against the upper end surface of the positioning ring 242 , and the other end of the protection spring 243 abuts against the inner top of the sealing head 233 .

[0047] It can be understood that when the head 233 moves downward and abuts against the floating ring 234, the guide rod 241 will first touch the floating ring 234. As the head 233 continues to move downward, the guide rod 241 is subject to a certain resistance and will move in the opposite direction. That is, the guide rod 241 moves upward relative to the head 233, and drives the positioning ring 242 to squeeze the protective spring 243. The elastic force of the protective spring 243 will force the displacement of the head 233 in the direction of the floating ring 234 to be blocked. In this way, the head 233 can be prevented from violently colliding with the floating ring 234 to a certain extent. At the same time, the resistance generated by the protective spring 243 is also applied to the primary energy dissipation component 22, thereby enhancing the consumption of power in the airflow by the primary energy dissipation component 22 and further reducing the rising speed of the primary energy dissipation component 22.

[0048] The following describes the use process of a ring main unit pressure relief device according to an embodiment of the present application with reference to the accompanying drawings:

[0049] During specific use, when high-pressure gas is generated in the cabinet 1 due to a fault, the gas will impact from the through-hole 217 into the extension tube 221 and directly impact the inner bottom of the top guide plate 224. At this time, the primary energy dissipation component 22 will be displaced upward by force, and the radial port of the airflow channel that was originally blocked with the large-diameter straight tube 212 will be in an open state as the primary energy dissipation component 22 rises. After being blocked by the top guide plate 224, the airflow will jump into the arc channel between the arc blades 223 and change the axial flow to radial flow. In the process of the airflow jumping out from between the arc channels, because the cross-section between the horn 222 and the top guide plate 224 is large at the bottom and small at the top, The shape of the airflow channel is reduced, and a tangential force will be applied to the arc blade 223 during the process of jumping out, causing the entire primary energy dissipation component 22 to rotate. In this way, the airflow rushes from the cabinet 1 into the primary energy dissipation component 22 and jumps out of it, which will drive the primary energy dissipation component 22 to rise and rotate synchronously, and the secondary energy dissipation component 23 inside it will generate a primary resistance by its own gravity and the displacement of the head 233 relative to the slide 231 inside, which causes the hydraulic oil to flow on both sides of the head 233, as well as the secondary resistance generated by the floating ring 234 and the tertiary resistance generated by the protective spring 243. First, the primary energy dissipation component 23 can be made to rotate. The rising speed of the energy dissipation component 22 is limited and slowed down. Secondly, the rising speed of the primary energy dissipation component 22 is blocked, and the airflow will make the primary energy dissipation component 22 rotate faster. In this way, the increase in rotation speed is used to reduce the upper body speed of the primary energy dissipation component 22, so that its safety is improved. At the same time, the turning of the airflow at the primary energy dissipation component 22 also avoids the formation of fixed-point impact and damage after the airflow rushes out, that is, the airflow rushing out of the primary energy dissipation component 22 will form an annular air curtain, and the original columnar airflow is transformed into a rotating and ejected annular airflow, and the safety is improved; when the airflow in the cabinet 1 escapes (after the air pressure is restored), it is affected by the compressed gas in the secondary energy dissipation component 23. The pressure on both sides of the hydraulic oil and the compressed gas is forced to maintain a balance, that is, the floating ring 234 is reset, and the hydraulic oil on both sides of the head 233 will also be restored to the initial state. Since the slide rod 232 is connected between the first rotating seat 236 and the small-diameter straight cylinder 211, the slide cylinder 231 will drive the entire primary energy dissipation component 22 to descend until it is reset to the initial state, and the radial airflow channel on the primary energy dissipation component 22 is re-blocked by the large-diameter straight cylinder 212. In this way, after the interior of the cabinet 1 is repaired, gas can be re-injected to form a sealed state. This design can be reused and reduce the maintenance workload. At the same time, the rotation and slow rising action avoid possible safety accidents under the impact of airflow.

[0050] Embodiment 2, in the related technology, in the above embodiment, the instantaneous high-temperature and high-pressure airflow generated in the cabinet 1 is discharged to the outside through the primary energy dissipation component 22. Because of the radial channel of the primary energy dissipation component 22, the airflow forms a ring shape when discharged and is radially ejected outward. Since the pressure of the gas generated inside the cabinet 1 is high, the flow rate of the ejected airflow will be very fast. Since the radial channel is smaller than the axial channel, the ejected airflow will form multiple streams and the speed is relatively fast. If the ejected airflow is not blocked or guided, once it directly impacts people or objects, it will inevitably cause certain destructive power.

[0051] According to some embodiments of the present application, Figure 7-Figure 10 As shown, an exhaust mechanism 3 is coaxially arranged on the outer side of the shell 21, and the exhaust mechanism 3 includes a lower cylinder 31, an upper cylinder 32 and a rotating ring 33. The lower cylinder 31 is coaxially sleeved on the small-diameter straight cylinder 211 and fixedly connected to the bottom end of the convex ring 213; the upper cylinder 32 is coaxially sleeved on the large-diameter straight cylinder 212 and fixedly connected to the top of the convex ring 213, the diameter of the upper cylinder 32 is the same as the diameter of the lower cylinder 31, and the lower cylinder 31 and the upper cylinder 32 are both located on the outside of the through hole 214; it can be seen that when the airflow is ejected from the primary energy dissipation component 22, it will be blocked by the upper cylinder 32, and the airflow will fill the upper cylinder 32 and enter the lower cylinder 31 through the through hole 214 on the convex ring 213.

[0052] In a specific embodiment of the present application, the rotating ring 33 is rotatably arranged in an annular slideway formed between two limit rings 216 of different diameters. It should be noted that the rotating ring 33 is located on the inner side of the through hole 214, and there is a clearance fit between the top of the rotating ring 33 and the shell 21.

[0053] A plurality of inclined holes 311 are evenly arranged on the side wall of the lower cylinder 31 in a circumferential direction, and an inward end of the inclined hole 311 is higher than an outward end of the inclined hole 311 .

[0054] Furthermore, a dome 321 is coaxially fixed to the top of the upper cylinder 32, and an inwardly contracted annular structure is provided at the bottom of the dome 321. A plurality of pressure relief holes 322 are evenly arranged circumferentially on the annular structure, and the number and aperture of the pressure relief holes 322 are smaller than the number and aperture of the through holes 214. It should be noted that the design of the dome 321 allows the airflow to change direction smoothly after impacting the dome 321, wherein the design of the pressure relief holes 322 can reduce the impact of the airflow on the dome 321, so that part of the airflow can flow to the outside from the pressure relief holes 322. In a specific embodiment of the present application, the airflow flowing out of the pressure relief holes 322 will impact downward (such as Figure 8 As shown, the pressure relief hole 322 is designed in an axial direction to prevent the airflow from rushing out horizontally and causing damage to the outside world.

[0055] Furthermore, a bevel ring 331 is coaxially fixed on the outer wall of the rotating ring 33, and the bottom end of the bevel ring 331 is located below the inclined hole 311. The bevel ring 331 and the lower cylinder 31 are clearance-matched. The outer wall of the rotating ring 33 is located above the bevel ring 331 and is evenly fixed with a plurality of arc-shaped pieces 332 in the circumferential direction. The plurality of arc-shaped pieces 332 are inclinedly arranged.

[0056] Therefore, when the airflow is ejected from the primary energy dissipation component 22, it will be blocked by the upper cylinder 32, and the airflow will fill the upper cylinder 32 and enter the lower cylinder 31 through the through hole 214 on the convex ring 213. During this period, the airflow is blocked by the upper cylinder 32 and then impacts the dome 321. Since the top of the dome 321 is concave and arc-shaped, the flow direction can be changed smoothly. The design of the pressure relief hole 322 can reduce the impact of the airflow on the dome 321 and allow part of the airflow to flow to the outside from the pressure relief hole 322. In the specific embodiment of the present application, the airflow flowing out of the pressure relief hole 322 will impact downward (such as Figure 8 As shown in the figure, the pressure relief hole 322 is axially designed) to prevent the airflow from rushing out horizontally and causing damage to the outside world. After most of the airflow is diverted, it passes through the through hole 214 on the convex ring 213 and enters the lower cylinder 31, and passes through multiple arc-shaped pieces 332, and then is blocked by the bevel ring 331. The airflow can and can only rush out from the multiple inclined holes 311. During this period, the airflow will generate tangential forces on the multiple arc-shaped pieces 332 and prompt the multiple arc-shaped pieces 332 to drive the rotating ring 33 to rotate. In this way, the airflow can be evenly distributed, and the kinetic energy in the airflow is further reduced due to the rotation action, so that the flow rate of the airflow discharged from the inclined holes 311 is reduced. The design of the inclined hole 311 allows the airflow to be evenly discharged from the side of the lower cylinder 31 and impact the top of the cabinet 1, which can clean the top of the cabinet 1 to a certain extent and blow the dirt that may exist on the top of the cabinet 1 off the cabinet 1. This design uses the upper cylinder 32 to force the airflow to change its course to avoid the destructive force caused by lateral impact, and uses the rotation of the rotating ring 33 to further consume the kinetic energy in the airflow, thereby reducing the flow rate of the airflow and further reducing the destructive force. Secondly, the inclined hole 311 is used to clean the top of the cabinet 1 when the airflow escapes, so as to fully utilize the high-pressure gas generated in the cabinet 1 and reduce its destructive force.

[0057] Embodiment three, in the related technology, if the gas pressure generated in the cabinet 1 is too large and the resistance generated in the energy dissipation mechanism 2 is not sufficient to suppress it, the primary energy dissipation component 22 will rise rapidly. This action can easily cause damage to the components inside the secondary energy dissipation component 23 and cause the primary energy dissipation component 22 to be unable to reset itself. In this way, even after the interior of the cabinet 1 is repaired, the space that should have been inflated will not be able to be sealed because the primary energy dissipation component 22 cannot be reset, and then cannot be inflated.

[0058] According to some embodiments of the present application, Fig.11 and Fig.12 As shown, an adjustment mechanism 4 is arranged between the top of the top guide plate 224 and the dome 321, and the adjustment mechanism 4 includes a top pressure plate 41, an adjustment assembly 42, a bottom pressure plate 43, an adjustment spring 44 and a second rotating seat 45. The top pressure plate 41 is slidably connected to the upper cylinder 32; the adjustment assembly 42 is coaxially fixed to the top pressure plate 41 and extends out of the dome 321; the bottom pressure plate 43 is rotatably connected to the top guide plate 224 and slidably cooperates with the upper cylinder 32; the adjustment spring 44 is coaxially arranged between the top pressure plate 41 and the bottom pressure plate 43, and the two ends of the adjustment spring 44 are respectively abutted against the top pressure plate 41 and the bottom pressure plate 43; one end of the second rotating seat 45 is coaxially fixed to the top guide plate 224, and the other end of the second rotating seat 45 is coaxially fixed to the bottom pressure plate 43.

[0059] Specifically, a plurality of upper channels 411 are evenly arranged circumferentially on the top pressure plate 41, and the upper channels 411 are located on the outside of the large-diameter straight cylinder 212. A plurality of guide strips 412 are evenly fixedly connected circumferentially on the inner wall of the upper cylinder body 32. The top pressure plate 41 and the bottom pressure plate 43 are respectively slidably matched with the plurality of guide strips 412, so that the top pressure plate 41 and the bottom pressure plate 43 can and can only undergo axial displacement in the upper cylinder body 32. An upper fixing ring 413 is coaxially fixedly connected to the bottom end of the top pressure plate 41. The upper fixing ring 413 is used to limit the top end of the adjusting spring 44 to prevent the adjusting spring 44 from being offset, tilted or even tilted between the top pressure plate 41 and the bottom pressure plate 43, thereby causing a lateral loss of elasticity.

[0060] Furthermore, the adjustment assembly 42 includes a threaded barrel 421 and an adjustment bolt 422 . The threaded barrel 421 is fixed to the top pressure plate 41 . The adjustment bolt 422 movably passes through the dome 321 and is threadably matched with the threaded barrel 421 .

[0061] Furthermore, a plurality of lower channels 431 are evenly arranged circumferentially on the bottom pressure plate 43, and the plurality of lower channels 431 correspond to the plurality of upper channels 411 in the axial direction. A lower fixing ring 432 corresponding to the upper fixing ring 413 is coaxially fixed to the top end of the bottom pressure plate 43, and the lower fixing ring 432 is used to limit the bottom end of the adjusting spring 44.

[0062] Specifically, in the initial state, the adjusting bolt 422 is rotated to make the top pressure plate 41 rise to the top, so that the pressure on the adjusting spring 44 is minimized. Then, when high-pressure gas is generated inside the cabinet 1, the airflow impacts and drives the primary energy dissipation component 22 to rotate and rise. At this time, the bottom pressure plate 43 will rise synchronously with the top guide plate 224 and squeeze the adjusting spring 44. The elasticity of the adjusting spring 44 is used to further apply a buffering force to the primary energy dissipation component 22, thereby reducing its rising speed and rising force. It can be understood that by rotating the adjusting bolt 422 to control the pressure value of the top pressure plate 41 on the adjusting spring 44 in the initial state, the bottom pressure plate 43 can be changed. 3 to the pressure of the primary energy dissipation component 22 in the initial state, so that the rising stroke of the primary energy dissipation component 22 can be controlled. Then it can be understood that the secondary energy dissipation component 23 can be protected by adjusting the elastic resistance of the bolt 422 and the position of the top pressure plate 41. At the same time, after the gas is discharged, the top pressure plate 41 can be lowered by adjusting the rotation of the bolt 422, and the bottom pressure plate 43 can be driven downward by adjusting the spring 44 to force the primary energy dissipation component 22 to descend, that is, the elasticity of the adjusting spring 44 is used to force the primary energy dissipation component 22 and the secondary energy dissipation component 23 to reset, so that the space connecting the shell 21 and the cabinet 1 is restored to a closed state, which is helpful for the inflation action after the internal repair of the cabinet 1.

[0063] It should be noted that the specific models and specifications of the cabinet 1, the first rotating seat 236, the protective spring 243, the adjusting spring 44, the second rotating seat 45, the threaded tube 421 and the adjusting bolt 422 need to be selected and determined according to the actual specifications of the device. The specific selection and calculation method adopts the existing technology in this field, so it will not be described in detail.

[0064] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A ring main unit pressure relief device, arranged at a position corresponding to a pressure relief channel of the ring main unit, characterized in that: include: An energy dissipation mechanism (2), wherein the energy dissipation mechanism (2) comprises: A shell (21), the shell (21) is fixedly connected to the ring main unit, the shell (21) is two upper and lower connected cylindrical structures, the diameter of the lower cylindrical structure is smaller than the diameter of the upper cylindrical structure, and a hollow support is provided at the bottom end of the lower cylindrical structure; A primary energy dissipation component (22), the primary energy dissipation component (22) being sealed and plugged into the shell (21), wherein the primary energy dissipation component (22) is divided into an upper and a lower part, the lower part being coupled to the lower cylindrical structure of the shell (21), and the upper part and the upper cylindrical structure of the shell (21) forming an open and closed state, the upper and lower parts of the primary energy dissipation component (22) being provided with connected air flow channels, wherein the air flow channel of the upper part is arc-shaped and radiates to the surrounding side; A secondary energy dissipation component (23), the secondary energy dissipation component (23) comprising a slide cylinder (231), a slide rod (232), a head (233) and a floating ring (234), the slide cylinder (231) being fixedly connected to the upper part of the primary energy dissipation component (22), the slide rod (232) being rotatably connected to a hollow cylindrical support at the bottom of the shell (21), the slide rod (232) being sealingly slidably plugged into the slide cylinder (231), the head (233) being fixedly connected to the slide rod (232) plugged into the slide cylinder (231), At one end, a gap is left between the peripheral side of the head (233) and the inner wall of the slide cylinder (231), the floating ring (234) is sealingly and slidably sleeved on the slide rod (232), the floating ring (234) and the inner wall of the slide cylinder (231) are sealingly and slidably matched, the slide cylinder (231) is filled with hydraulic oil on the side of the floating ring (234) facing the head (233), and the slide cylinder (231) is filled with compressed gas on the side of the floating ring (234) away from the head (233); A plurality of protection components (24) are sealingly and slidably plugged into the sealing head (233); the plurality of protection components (24) are evenly distributed circumferentially on the sealing head (233); both ends of the protection components (24) extend out of the sealing head (233); and the protection components (24) have elastic displacement in the sealing head (233).

2. A ring main unit pressure relief device according to claim 1, characterized in that: The lower cylindrical structure of the shell (21) is a small-diameter straight cylinder (211), and the upper cylindrical structure of the shell (21) is a large-diameter straight cylinder (212). The small-diameter straight cylinder (211) and the large-diameter straight cylinder (212) are coaxially fixedly connected. A convex ring (213) is coaxially fixedly connected to the outer wall of the large-diameter straight cylinder (212). A plurality of through holes (214) are evenly arranged circumferentially on the convex ring (213). The bottom end of the small-diameter straight cylinder (211) is coaxially fixedly connected to a base (215). Two limiting rings (216) with different diameters are coaxially fixedly connected to the upper end surface of the base (215). An annular slideway is formed between the two limiting rings (216) with different diameters. The bottom end of the small-diameter straight cylinder (211) is a hollow support. A plurality of through holes (217) are evenly arranged circumferentially on the hollow support.

3. A ring main unit pressure relief device as claimed in claim 2, characterized in that: The lower part of the primary energy dissipation component (22) is an extension tube (221), and the upper part of the primary energy dissipation component (22) is a coaxially arranged horn tube (222), a plurality of arc-shaped blades (223) and a top guide plate (224); the extension tube (221) is coaxially arranged in the small-diameter straight tube (211) and the two are coupled; the horn tube (222) is coaxially fixed to the top end of the extension tube (221) and is located in the large-diameter straight tube (212); the plurality of arc-shaped blades (223) are circumferentially uniformly fixed to the open end of the horn tube (222); and the top guide plate (224) is coaxially fixed to a side of the plurality of arc-shaped blades (223) away from the horn tube (222).

4. A ring main unit pressure relief device as claimed in claim 3, characterized in that: The outer edge of the lower end surface of the top guide plate (224) is arranged in an arc shape, and an annular channel is formed between the open end of the horn (222) and the arc shape of the lower end surface of the top guide plate (224), and the cross-section of the annular channel is an arc shape with a larger bottom and a smaller top, and a plurality of arc-shaped blades (223) divide the annular channel into an upper airflow channel.

5. A ring main unit pressure relief device as claimed in claim 2, characterized in that: The air flow channel at the upper part of the primary energy dissipation component (22) is closed or opened by the large-diameter straight cylinder (212).

6. A ring main unit pressure relief device according to claim 1, characterized in that: The interior of the sealing head (233) is hollow, and a plurality of arc strips (235) are evenly fixed to the side wall of the sealing head (233) in a circumferential direction. The plurality of arc strips (235) and the inner wall of the slide cylinder (231) are slidably matched, and the plurality of arc strips (235) form a plurality of arc flow channels between the sealing head (233) and the slide cylinder (231) for the hydraulic oil to flow.

7. A ring main unit pressure relief device as claimed in claim 2, characterized in that: One end of the slide rod (232) extending out of the slide cylinder (231) is coaxially fixedly connected to a first rotating seat (236), and the first rotating seat (236) is coaxially fixedly connected to a hollow support at the bottom end of the small-diameter straight cylinder (211).

8. The ring main unit pressure relief device according to claim 1, characterized in that: The protection component (24) comprises: A guide rod (241), the guide rod (241) sealingly and slidably passes through the sealing head (233); a positioning ring (242), the positioning ring (242) being fixedly sleeved on a portion of the guide rod (241) located on the sealing head (233); A protection spring (243), wherein the protection spring (243) is sleeved on the guide rod (241).

9. A ring main unit pressure relief device as claimed in claim 8, characterized in that: One end of the protection spring (243) abuts against the upper end surface of the positioning ring (242), and the other end of the protection spring (243) abuts against the inner top of the sealing head (233).

10. A ring main unit, characterized in that: A ring main unit pressure relief device comprising the method according to any one of claims 1 to 9, further comprising a cabinet body (1), wherein the energy dissipation mechanism (2) is fixedly connected to a position on the cabinet body (1) corresponding to a pressure relief channel.

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