Pressure-relief explosion-proof ring main unit

Abstract

The invention discloses a pressure-relief explosion-proof type ring main unit, which belongs to the field of ring main units and comprises a cabinet body, a shell is fixedly connected to the left side of the cabinet body, and an explosion-proof mechanism is arranged in the shell; the explosion-proof mechanism is used for relieving gas which expands after being heated in the gas cavity in the cabinet body and preventing the cabinet body from exploding due to expansion of the gas in the cabinet body; and the anti-explosion mechanism comprises a plurality of second connecting pipes fixed to the bottom of the right side of the shell, a mounting plate is fixedly connected to the middle of the interior of the shell, and a movable plate is slidably connected to the bottom of the mounting plate. When gas in the shell is heated to expand, the gas in the shell can reach the interior of the shell through a second connecting pipe, the expanded gas in the cabinet body is decompressed, cabinet body explosion caused by gas heating expansion is prevented, gas heating expansion drives a moving plate to move in the direction away from the cabinet body, more gas can be stored, and the safety of the cabinet body is improved. And the protection effect is better.

Description

Technical Field

[0001] This invention relates to the field of ring main units, and more specifically, to a pressure relief explosion-proof ring main unit. Background Technology

[0002] A ring main unit (RMU) is an electrical device consisting of a group of power transmission and distribution equipment housed in a metal or non-metal insulated cabinet or assembled into a modular ring network power supply unit. Its core components utilize load switches and fuses. It offers advantages such as simple structure, small size, low cost, improved power supply parameters and performance, and enhanced power supply safety. It is widely used in substations and prefabricated substations in load centers such as urban residential areas, high-rise buildings, large public buildings, and factories.

[0003] The copper guide plate and the guide rod are fixed by tightening with one-way bolts. Once the bolts loosen, the electrical connection may become unstable.

[0004] Chinese patent CN110137026A discloses a ring main unit where a copper busbar is pressed upward against a first abutting ring by a first strong spring, resulting in a tight connection between the copper busbar and the first abutting ring and a stable electrical connection.

[0005] Chinese patent CN113937634A discloses an inflatable ring main unit that uses a second buffer block to protect the front and rear sides of the unit, allowing the unit to contact the wall through the first or second buffer block, thus preventing the unit from being damaged by collision.

[0006] The first method involves the copper busbar being pressed upward against the first abutment ring by the first strong spring, resulting in a tight connection between the copper busbar and the first abutment ring and a stable electrical connection. The second method involves the first or second buffer block contacting the wall, making the cabinet less prone to collision damage. However, the heat generated by the gas inside the ring main unit due to internal components and the influence of the environment can cause the gas to expand due to heat, which can lead to an expansion and explosion of the device. Summary of the Invention

[0007] To address the problems existing in the prior art, the purpose of this invention is to provide a pressure relief explosion-proof ring main unit. When the gas inside the housing is heated and expands, the gas inside the housing can reach the interior of the housing through the second connecting pipe, thereby reducing the pressure on the expanding gas inside the cabinet and preventing the cabinet from exploding due to the heat expansion of the gas. The heat expansion of the gas drives the moving plate to move away from the cabinet, thereby storing more gas and providing better protection.

[0008] To solve the above problems, the present invention adopts the following technical solution.

[0009] A pressure relief explosion-proof ring main unit includes a cabinet body, a shell fixedly connected to the left side of the cabinet body, and an explosion-proof mechanism is provided inside the shell body;

[0010] The explosion-proof mechanism is used to mitigate the gas expansion caused by heat inside the gas chamber of the cabinet, preventing the cabinet from exploding due to the expansion of the internal gas.

[0011] The explosion-proof mechanism includes multiple second connecting pipes fixed to the bottom right side of the housing. An installation plate is fixedly connected to the middle of the housing. A movable plate is slidably connected to the bottom of the installation plate. The second connecting pipes are connected to the space inside the housing below the installation plate.

[0012] Furthermore, the top of the movable plate extends upward to form an extension block, and the interior of the mounting plate has a movable groove corresponding to the position of the extension block to accommodate the movement of the extension block.

[0013] Furthermore, a first spring is welded to the left side of the extension block inside the moving groove, and a second airbag is fixedly connected to the right side of the moving plate. The second airbag is connected to one of the second connecting pipes.

[0014] Furthermore, the elastic force of the first spring on the extension block is the same as the pressure exerted on the moving plate by the gas inside the cabinet as it reaches the inside of the housing on the right side of the moving plate.

[0015] Furthermore, the top of the mounting plate is provided with multiple buffer components, each including an outer cylinder fixedly connected to the mounting plate, and a first connecting pipe fixedly connected to the bottom of the inner side of the outer cylinder for connecting the outer cylinder with the left side of the mounting plate and the movable plate to form a space.

[0016] Furthermore, a first airbag is provided inside the outer cylinder and communicates with the first connecting pipe. A weight is provided on the top of the first airbag and is slidably connected to the outer cylinder. The top right side of the moving plate extends to the right.

[0017] Furthermore, the movable plate and the inner wall of the left side of the housing are provided with corresponding exhaust components. The exhaust components include cylinders that are fixedly connected to the corresponding housing and movable plate, and rubber blocks are fixedly connected to the opposite surfaces of the two cylinders.

[0018] Furthermore, a second disc is fixedly connected to the center of the exhaust component, and a connecting rod is slidably connected to the center of the second disc. A first disc is fixedly connected to the end of the connecting rod away from the compression. Both the first and second discs have circular holes on their surfaces, and the circular holes on the surface of the first disc and the surface of the second disc are staggered.

[0019] Furthermore, a second spring is fitted onto the surface of the connecting rod, and the second spring is in a naturally extended state when the two connecting rods are not pressing against each other.

[0020] Furthermore, a spray can is detachably connected to the inside of the right side of the housing, below the mounting plate, and a button-type alarm is fixedly connected to the inside of the right side of the housing, below the mounting plate.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] 1. This solution works by allowing the gas inside the housing to expand when heated, through a second connecting pipe to reduce the pressure on the expanding gas inside the cabinet, preventing the cabinet from exploding due to thermal expansion. The thermal expansion of the gas drives the movable plate to move away from the cabinet, thus storing more gas and providing better protection. Nitrogen is filled inside the housing on the left side of the movable plate. Because nitrogen has a small coefficient of thermal expansion, it is less affected by the external environment, preventing the nitrogen from pushing the movable plate towards the cabinet due to thermal expansion.

[0023] 2. This solution utilizes the movement of a movable plate under gas compression, causing it to move along with an extension block within the movable slot. This makes the movement of the movable plate more stable. When the internal temperature of the housing cools down, the pressure exerted by the gas on the movable plate decreases. At this point, the movable plate, under the action of the first spring, can return the extension block to its original position. After the internal pressure of the housing is relieved, the gas inside the housing can also return to its original position, effectively avoiding the need to replenish gas in the discharged gas chamber after achieving the pressure relief effect. Furthermore, the gas replenished in the device is sulfur hexafluoride, and direct discharge would cause problems. Also, since the device is placed outdoors, it is difficult to observe the gas expansion state inside the device. The gas in the gas chamber inside the cabinet expands due to heat and reaches the interior of the second air bladder through the second connecting pipe. The second air bladder expands due to gas injection, and the expansion of the second air bladder compresses the movable plate. This makes the movable plate move more sensitively due to the change in gas pressure inside the gas chamber inside the cabinet, resulting in better protection of the cabinet.

[0024] 3. This design uses the first airbag to move the weight upwards, allowing the gas in the space between the left side of the moving plate and the mounting plate to reach the interior of the outer cylinder. This increases the space on the right side of the moving plate, facilitating the storage of more gas inside the cabinet. After the gas inside the cabinet cools down, the moving plate returns to its original position. At this time, the space on the left side of the moving plate increases, and the gas in the first airbag is squeezed out under the weight of the weight, allowing the gas in the first airbag to return to the space on the left side of the moving plate through the first connecting pipe. This allows the device to repeatedly protect the device, resulting in better protection. The extension of the moving plate blocks the first connecting pipe, preventing the gas in the first airbag from reaching the right side of the moving plate through the first connecting pipe, causing gas mixing and preventing the gas inside the cabinet from protecting the device inside the cabinet, thus causing damage to the device.

[0025] 4. This solution uses a moving plate to move the cylinder and compress the cylinder on the surface of the housing. At the same time, the two cylinders are connected, and the connection end is prevented from leaking gas from the right side of the moving plate through the connection end of the two exhaust components due to the mutual compression of the rubber blocks. This allows the gas on the right side of the moving plate to reach the outside of the housing from the cylinder, so that the device can release the gas that expands too much inside the cabinet, and the protection effect of the device is better.

[0026] 5. In this solution, when gas leaks inside the cabinet, causing the air pressure on the right side of the moving plate to gradually decrease, the original first spring exerts the same thrust on the extension block as the air pressure on the right side of the moving plate. However, the decrease in air pressure on the right side of the moving plate reduces the thrust on the moving plate. At this time, the pressure on the left side of the moving plate is greater than the pressure on the right side, causing the moving plate to move to the right. This allows the moving plate to squeeze the excess gas inside the casing into the cabinet, replenishing the cabinet and mitigating the situation where the reduced gas inside the cabinet fails to protect the components inside.

[0027] 6. This solution uses a spray can to vent internal gas into the space on the right side of the movable plate, replenishing the gas inside the cabinet and providing time for maintenance personnel to arrive and perform repairs. A button-type alarm is fixedly connected inside the right side of the housing, below the mounting plate. When the movable plate presses the spray can, it also presses the button of the button-type alarm, causing the alarm to sound and facilitating maintenance personnel to perform repairs. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the ring main unit of the present invention;

[0029] Figure 2 This is a schematic diagram of the structure of the housing of the present invention;

[0030] Figure 3 This is a schematic diagram of the explosion-proof mechanism of the present invention;

[0031] Figure 4 This is a schematic diagram of the structure of the buffer component of the present invention;

[0032] Figure 5 This is an extended view of the internal structure of the housing of the present invention;

[0033] Figure 6 This is a schematic diagram of the exhaust component of the present invention;

[0034] Figure 7 This is a schematic diagram of the structure of the first disk of the present invention;

[0035] Figure 8 for Figure 3 Enlarged view of part A.

[0036] Explanation of the labels in the diagram:

[0037] 1. Cabinet; 2. Shell; 3. Explosion-proof mechanism; 31. Buffer; 311. Heavy object; 312. Outer cylinder; 313. First airbag; 314. First connecting pipe; 32. Second connecting pipe; 33. Mounting plate; 331. Moving slot; 34. Spray can; 35. Button alarm; 36. Second airbag; 37. Moving plate; 371. Extension block; 372. First spring; 38. Exhaust device; 381. Rubber block; 382. Cylinder; 383. First disc; 384. Connecting rod; 385. Second spring; 386. Second disc; 387. Circular hole. Detailed Implementation

[0038] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0039] Please see Figures 1 to 3 An explosion-proof ring main unit includes a cabinet body 1. A shell 2 is fixedly connected to the left side of the cabinet body 1. An explosion-proof mechanism 3 is installed inside the shell 2. The explosion-proof mechanism 3 is used to mitigate the expansion of gas inside the gas chamber of the cabinet body 1 due to heat, preventing the cabinet body 1 from exploding due to the expansion of internal gas. The explosion-proof mechanism 3 includes multiple second connecting pipes 32 fixed to the bottom right side of the shell 2. The shell 2 is connected to the gas chamber inside the cabinet body 1 through the second connecting pipes 32. When the gas inside the shell 2 expands due to heat, the gas inside the shell 2 can reach the interior of the shell 2 through the second connecting pipes 32, thus mitigating the pressure and explosion of the interior of the cabinet body 1. The expanding gas is depressurized to prevent the gas from expanding due to heat and causing the cabinet 1 to explode. An installation plate 33 is fixedly connected to the middle of the interior of the shell 2. A movable plate 37 is slidably connected to the bottom of the installation plate 33. The second connecting pipe 32 is connected to the space inside the shell 2 below the installation plate 33, so that the gas expands due to heat and drives the movable plate 37 to move away from the cabinet 1, thereby storing more gas and improving the protection effect. Nitrogen is filled inside the shell 2 to the left of the movable plate 37. Since nitrogen has a small coefficient of thermal expansion, the external environment has little impact on nitrogen, preventing the nitrogen from expanding due to heat and pushing the movable plate 37 towards the cabinet 1.

[0040] like Figures 1 to 3 and Figure 8As shown, the top of the movable plate 37 extends upward to form an extension block 371. A movable groove 331 is provided inside the mounting plate 33 at the position corresponding to the extension block 371 to accommodate its movement. The movable plate 37 moves under the pressure of gas, causing it to carry the extension block 371 within the movable groove 331. This makes the movement of the movable plate 37 more stable and prevents it from tilting, which could cause gas inside the cabinet 1 to leak to the left side of the movable plate 37. A first spring 372 is welded inside the movable groove 331 to the left side of the extension block 371. The elastic force of the first spring 372 on the extension block 371 is the same as the pressure exerted on the movable plate 37 by the gas inside the cabinet 1 reaching the right side of the movable plate 37 inside the shell 2. This keeps the movable plate 37 in the middle of the mounting plate 33. When the shell 2 cools down, the pressure of the gas inside the shell 2 on the movable plate 37... As the device descends, the movable plate 37, under the action of the first spring 372, can return the extension block 371 to its original position. After the internal pressure of the housing 2 is relieved, the gas inside the housing 2 can also return to its original position, effectively avoiding the need to replenish the gas chamber after the gas is discharged. Moreover, the gas replenished in the device is sulfur hexafluoride, and direct discharge will cause problems. Furthermore, the device is placed outdoors, making it difficult to observe the gas expansion state inside the device. A second airbag 36 is fixedly connected to the right side of the movable plate 37. The second airbag 36 is connected to one of the second connecting pipes 32. The gas in the gas chamber inside the cabinet 1 expands due to heat and reaches the interior of the second airbag 36 through the second connecting pipe 32, causing the second airbag 36 to expand due to the gas injection. The expansion of the second airbag 36 compresses the movable plate 37, making the movable plate 37 more sensitive to the changes in gas pressure inside the gas chamber of the cabinet 1, thus providing better protection for the cabinet 1.

[0041] like Figures 1 to 4As shown, the top of the mounting plate 33 is provided with multiple buffers 31. Each buffer 31 includes an outer cylinder 312 fixedly connected to the mounting plate 33. The bottom of the inner cavity of the outer cylinder 312 is fixedly connected to a first connecting pipe 314 for connecting the space formed between the outer cylinder 312, the mounting plate 33, and the left side of the movable plate 37. When the movable plate 37 moves due to the expansion of gas inside the cabinet 1, the movable plate 37 compresses the gas in the space formed between the left side of the movable plate 37 and the mounting plate 33, causing the gas to reach the first connecting pipe 314. The outer cylinder 312 is provided with a first airbag 313 connected to the first connecting pipe 314. Gas passes through the first airbag 313 to the interior of the first airbag 313, causing the first airbag 313 to inflate. The top of the first airbag 313 is provided with a weight 311 slidably connected to the outer cylinder 312. When the first airbag 313 inflates, the first airbag 313 compresses the weight 311. The upward movement of the movable plate 37 allows the gas in the space between the left side of the movable plate 37 and the mounting plate 33 to reach the interior of the outer cylinder 312, thus increasing the space on the right side of the movable plate 37 to facilitate the storage of more gas from the cabinet 1. After the gas in the cabinet 1 cools down, the movable plate 37 returns to its original position. At this time, the space on the left side of the movable plate 37 increases, and the gas in the first airbag 313 is squeezed out under the gravity of the weight 311, allowing the gas in the first airbag 313 to return to the space on the left side of the movable plate 37 along the first connecting pipe 314. This allows the device to repeatedly protect the device, resulting in better protection. The top right side of the movable plate 37 extends to the right, blocking the first connecting pipe 314 through the extended part of the movable plate 37, preventing the gas in the first airbag 313 from reaching the right side of the movable plate 37 through the first connecting pipe 314, causing gas mixing, and preventing the gas in the cabinet 1 from protecting the device inside the cabinet 1, thus causing damage to the device.

[0042] like Figure 3 and Figures 5 to 7As shown, both the movable plate 37 and the inner left side of the housing 2 are provided with corresponding exhaust components 38. Each exhaust component 38 includes a cylinder 382 fixedly connected to the corresponding housing 2 and movable plate 37. Rubber blocks 381 are fixedly connected to the opposite faces of the two cylinders 382. When the movable plate 37 expands due to gas, it moves the cylinders 382, ​​causing the rubber blocks 381 of the two cylinders 382 to press against each other. A second disc 386 is fixedly connected to the center of the exhaust component 38, and a connecting rod 384 is slidably connected to the center of the second disc 386. When 381 is pressed against each other, the two connecting rods 384 also press against each other, causing the connecting rods 384 to move within the second disk 386 under pressure. The end of the connecting rod 384 away from the pressing end is fixedly connected to the first disk 383. The first disk 383 and the second disk 386 are tightly fitted together. When the connecting rod 384 is pressed and moves, it moves the first disk 383 along with it, causing the first disk 383 and the second disk 386 to separate. Both the first disk 383 and the second disk 386 have circular holes 387 on their surfaces. The surface of the first disk 383... The circular hole 387 is offset from the circular hole 387 on the surface of the second disk 386. When the second disk 386 and the first disk 383 are in contact, the circular holes 387 on the surfaces of the first disk 383 and the second disk 386 are blocked by each other, preventing the gas on the right side of the moving plate 37 from passing through the cylinder 382 inside the moving plate 37 to the interior of the cylinder 382 on the other side. After the first disk 383 moves, a gap appears between the first disk 383 and the second disk 386, allowing the cylinder 382 to connect. When the moving plate 37 moves with the cylinder 382... While the cylinder 382 on the surface of the housing 2 is being squeezed, the two cylinders 382 are connected, and the connection end is prevented from leaking gas from the right side of the moving plate 37 from the connection end of the two exhaust components 38 due to the mutual squeezing of the rubber blocks 381. This allows the gas on the right side of the moving plate 37 to reach the outside of the housing 2 from the cylinder 382, ​​so that the device can release the gas that has expanded too much inside the cabinet 1, and the device can be better protected. A second spring 385 is sleeved on the surface of the connecting rod 384. The second spring 385 is in a naturally extended state when the two connecting rods 384 are not squeezing each other.

[0043] like Figure 3 and Figure 5As shown, a spray can 34 is detachably connected to the inside of the right side of the housing 2, below the mounting plate 33. When gas leaks inside the cabinet 1, the air pressure inside the right side of the moving plate 37 gradually decreases. Since the original thrust of the first spring 372 on the extension block 371 and the air pressure on the right side of the moving plate 37 on the moving plate 37 were the same, the decrease in air pressure on the right side of the moving plate 37 reduces the thrust on the moving plate 37. At this time, the pressure on the left side of the moving plate 37 is greater than the pressure on the right side, causing the moving plate 37 to move to the right. This allows the moving plate 37 to squeeze excess gas from the housing 2 into the interior of the cabinet 1, replenishing the cabinet 1 and alleviating the gas leak inside. The reduced gas level in the cabinet 1 prevents it from protecting the components inside. The moving plate 37 compresses the spray can 34, filling it with the same gas as the cabinet 1. This causes the spray can 34 to release its internal gas into the space to the right of the moving plate 37, replenishing the gas inside the cabinet 1 and providing time for maintenance personnel to arrive and repair the equipment. A push-button alarm 35 is fixedly connected to the inside right side of the housing 2, below the mounting plate 33. Simultaneously, the moving plate 37 compresses the button on the push-button alarm 35, triggering the alarm and facilitating maintenance personnel to arrive.

[0044] Instructions for use: When the gas inside the cabinet 1 expands due to heat, the gas compresses the movable plate 37, causing it to move and create space for the gas inside the cabinet 1 to release pressure. When the gas inside the cabinet 1 expands too much, the exhaust vent 38 of the movable plate 37 connects with the exhaust vent 38 inside the housing 2, allowing the gas to be discharged to the outside, thus providing additional protection for the device. When the gas inside the cabinet 1 leaks, the balance of the movable plate 37 is disrupted, causing it to move towards the cabinet 1 and compress the spray can 34 and the push-button alarm 35, continuously replenishing the gas inside the cabinet 1 while simultaneously triggering an alarm.

[0045] The above are merely preferred embodiments of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concept, should be covered within the scope of protection of the present invention.

Claims

1. A pressure relief explosion-proof ring main unit, comprising a cabinet (1), characterized in that: The cabinet (1) is fixedly connected to a shell (2) on the left side, and an explosion-proof mechanism (3) is provided inside the shell (2); The explosion-proof mechanism (3) is used to alleviate the gas expansion caused by heat inside the gas chamber of the cabinet (1) and prevent the cabinet (1) from exploding due to the expansion of the internal gas. The explosion-proof mechanism (3) includes multiple second connecting pipes (32) fixed to the bottom right side of the housing (2). An installation plate (33) is fixedly connected to the middle of the interior of the housing (2). A movable plate (37) is slidably connected to the bottom of the installation plate (33). The second connecting pipes (32) are connected to the space inside the housing (2) below the installation plate (33).

2. The explosion-proof ring main unit according to claim 1, characterized in that: The top of the movable plate (37) extends upward to form an extension block (371), and the interior of the mounting plate (33) is provided with a moving groove (331) to accommodate the movement of the extension block (371).

3. The explosion-proof ring main unit according to claim 2, characterized in that: The first spring (372) is welded inside the moving groove (331) to the left side of the extension block (371), and the second airbag (36) is fixedly connected to the right side of the moving plate (37). The second airbag (36) is connected to one of the second connecting pipes (32).

4. The explosion-proof ring main unit according to claim 3, characterized in that: The elastic force of the first spring (372) on the extension block (371) is the same as the pressure exerted on the moving plate (37) by the gas inside the cabinet (1) reaching the inside of the shell (2) on the right side of the moving plate (37).

5. The explosion-proof ring main unit according to claim 4, characterized in that: The top of the mounting plate (33) is provided with a plurality of buffers (31). The buffers (31) include an outer cylinder (312) fixedly connected to the mounting plate (33). The bottom of the inner side of the outer cylinder (312) is fixedly connected to a first connecting pipe (314) for connecting the outer cylinder (312) with the left side of the mounting plate (33) and the movable plate (37) to form a space.

6. The explosion-proof ring main unit according to claim 5, characterized in that: The outer cylinder (312) is provided with a first airbag (313) that communicates with the first connecting pipe (314). The top of the first airbag (313) is provided with a weight (311) that is slidably connected to the outer cylinder (312). The top right side of the moving plate (37) extends to the right.

7. A pressure-relief explosion-proof ring main unit according to claim 6, characterized in that: The movable plate (37) and the inner left side of the housing (2) are each provided with a corresponding exhaust device (38). The exhaust device (38) includes a cylinder (382) that is fixedly connected to the corresponding housing (2) and movable plate (37) respectively. A rubber block (381) is fixedly connected to the opposite side of the two cylinders (382).

8. The explosion-proof ring main unit according to claim 7, characterized in that: The exhaust component (38) has a second disc (386) fixedly connected to its inner center. A connecting rod (384) is slidably connected to the center of the second disc (386). A first disc (383) is fixedly connected to the end of the connecting rod (384) away from the compression. Both the first disc (383) and the second disc (386) have circular holes (387) on their surfaces. The circular holes (387) on the surface of the first disc (383) and the circular holes (387) on the surface of the second disc (386) are staggered.

9. A pressure-relief explosion-proof ring main unit according to claim 8, characterized in that: A second spring (385) is sleeved on the surface of the connecting rod (384), and the second spring (385) is in a naturally extended state when the two connecting rods (384) are not pressing against each other.

10. A pressure-relief explosion-proof ring main unit according to claim 9, characterized in that: A spray can (34) is detachably connected to the inside of the right side of the housing (2) below the mounting plate (33), and a button-type alarm (35) is fixedly connected to the inside of the right side of the housing (2) below the mounting plate (33).

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