A ring main unit pressure relief device and ring main unit thereof

Abstract

The application provides a ring main unit pressure relief device and a ring main unit, which comprise a shell, an air inlet cavity, an air outlet cavity, a pressure storage cavity, a first air inlet structure, a first air outlet structure, a filter assembly, a second air inlet structure and a second air outlet structure are arranged in the shell; the first air inlet structure, the first air outlet structure, the second air inlet structure and the second air outlet structure are all one-way non-return structures, and the first air inlet structure, the first air outlet structure, the second air outlet structure are linked; a cooling structure is arranged in the air outlet cavity, and the cooling structure is used for cooling the gas entering the air outlet cavity; the filter assembly is connected with a vibration structure, and the vibration structure is used for vibrating the filter assembly. By using the above structure, the gas can be cooled, dust in the gas can be effectively filtered, and the cleaning function of the filter screen itself can be realized.

Description

Technical Field

[0001] This invention relates to pressure relief devices and ring main units, specifically to a pressure relief device for a ring main unit and the ring main unit thereof. Background Technology

[0002] Ring main units (RNBs) are a very common type of electrical equipment. Most existing RNBs have a RNB compartment, which is filled with a pressurized insulating gas to ensure safe operation. The insulating gas used in the RNB compartment is typically SF6 gas, which has strong insulation and arc-extinguishing capabilities.

[0003] When an electric arc fault occurs in the gas chamber of a ring main unit, the arc generates a large amount of heat, causing the gas temperature inside the unit to rise and expand rapidly. To prevent the ring main unit from bursting due to the expanding gas, it is necessary to depressurize it. Simultaneously, considering the need to avoid SF6 gas emissions and environmental pollution, and the requirement to restore the gas pressure inside the ring main unit to a predetermined range after depressurization, most existing depressurization devices employ a sealed buffer chamber for depressurization. Specifically, when an electric arc fault occurs, the high-temperature, high-pressure gas inside the ring main unit enters the buffer chamber; after the gas pressure inside the ring main unit decreases, the gas in the buffer chamber flows back into the ring main unit.

[0004] However, most current pressure relief devices lack cooling methods and cannot lower the temperature of the gas in the buffer chamber. After the gas pressure inside the ring main unit decreases, the high-temperature gas in the buffer chamber will flow into the ring main unit, keeping the gas inside the ring main unit at a high temperature for a long time, which is obviously detrimental to the stable operation of the ring main unit.

[0005] In addition, arcing faults generate a large amount of fine metallic and non-metallic dust. If this dust is not effectively removed during the pressure relief process, it will redistribute with the airflow and deposit inside the ring main unit, causing secondary pollution and potentially triggering subsequent electrical faults, affecting the insulation performance and operational reliability of the ring main unit. Traditional pressure relief devices typically have simple filter components to filter the depressurized gas; however, these simple filter components lack self-cleaning capabilities and are prone to clogging after prolonged use, thus affecting the filtration effect.

[0006] Therefore, how to cool the gas during the depressurization process, effectively filter the dust in the gas, and achieve the cleaning function of the filter itself have become key issues that urgently need to be addressed. Summary of the Invention

[0007] To overcome the existing technical problems, the present invention provides a ring main unit pressure relief device and its ring main unit that can cool gas, effectively filter dust in gas, and achieve the cleaning function of the filter screen itself.

[0008] The present invention adopts the following technical solution.

[0009] A pressure relief device for a ring main unit includes an outer shell, an air inlet chamber, an exhaust chamber and a pressure storage chamber inside the outer shell, a first air inlet structure and a first exhaust structure respectively connected to the air inlet chamber and the exhaust chamber, a filter assembly provided between the air inlet chamber and the exhaust chamber, and a second air inlet structure and a second exhaust structure connected to the pressure storage chamber and the exhaust chamber.

[0010] The first intake structure, the first exhaust structure, the second intake structure, and the second exhaust structure are all one-way check structures, and the first intake structure, the first exhaust structure, and the second exhaust structure are linked together.

[0011] When the first intake structure or the second exhaust structure is in the open state, the first exhaust structure is in the closed state;

[0012] When the first exhaust structure is in the open state, the second exhaust structure is in the closed state;

[0013] The exhaust chamber is equipped with a cooling structure, which is used to cool the gas entering the exhaust chamber;

[0014] The filter assembly is connected to a vibration-inducing structure, which is used to make the filter assembly vibrate.

[0015] As a further improvement of the present invention, the outer shell includes a first shell, a second shell sleeved on the outside of the first shell, and a third shell integrally connected to one end of the second shell;

[0016] An air intake chamber is formed between the first and second housings, an exhaust chamber is formed inside the second housing, and a pressure storage chamber is formed inside the third housing.

[0017] As a further improvement of the present invention, the cooling structure includes a first heat exchanger disposed in the exhaust chamber, and a heat exchange tube whose cold end is thermally connected to the first heat exchanger.

[0018] As a further improvement of the present invention, a pressure piston and an adjusting piston are sequentially and slidably connected in the pressure storage chamber along the direction away from the exhaust chamber.

[0019] A gas chamber is formed between the end of the compressor piston near the exhaust chamber and the pressure storage chamber. A first spring is connected between the compressor piston and the adjusting piston, and a second spring is connected between the adjusting piston and the pressure storage chamber.

[0020] A thermal expansion chamber is formed between the end of the adjusting piston away from the exhaust chamber and the pressure storage chamber. The thermal expansion chamber is equipped with a second heat exchanger and filled with thermal expansion material. The second heat exchanger is thermally connected to the hot end of the heat exchange tube.

[0021] As a further improvement of the present invention, a first valve seat is provided on the outer casing;

[0022] The first air intake structure includes a first air intake hole formed on a first valve seat, a first air intake valve core that cooperates with the first air intake hole, and a first elastic member connected to the first air intake valve core.

[0023] The first exhaust structure includes a first exhaust hole opened on a first valve seat, a first exhaust valve core that cooperates with the first exhaust hole, and a first elastic member connected to the first exhaust valve core;

[0024] A first locking ball is movably connected to the first valve seat, a first actuating wall is provided on the first intake valve core, and a first limiting shoulder is provided on the first exhaust valve core.

[0025] When the first intake valve core opens the first intake port, the first actuating wall pushes the first locking ball to the position where it abuts against the first limiting shoulder.

[0026] As a further improvement of the present invention, a second valve seat is provided on the outer casing;

[0027] The second air intake structure includes a second air intake hole opened on the second valve seat, a second air intake valve core that cooperates with the second air intake hole, and a second elastic element connected to the second air intake valve core;

[0028] The second exhaust structure includes a second exhaust port opened on the second valve seat, a second exhaust valve core that cooperates with the second exhaust port, and a second elastic member connected to the second exhaust valve core;

[0029] The second valve seat is movably connected to the second locking ball, the second exhaust valve core is provided with the second actuating wall and the second limiting shoulder, the first intake valve core is connected to the transmission rod, and the transmission rod is provided with the third actuating wall and the third limiting shoulder.

[0030] When the first exhaust valve core opens the first exhaust port, the third actuating wall pushes the second locking ball to the position where it abuts against the second limiting shoulder;

[0031] When the second exhaust valve core opens the second exhaust port, the second actuating wall pushes the second locking ball to the position where it abuts against the third limiting shoulder.

[0032] As a further improvement of the present invention, the vibration-initiating structure includes a rotatable impeller and a plurality of ratchet teeth evenly distributed on the outer edge of the impeller, the impeller being located on the airflow trajectory of the second exhaust structure;

[0033] The filter assembly includes a slidably mounted bracket, a filter screen mounted on the bracket, and a reset elastic element connected to the bracket. The bracket is provided with a pin that is slidably connected to a ratchet.

[0034] As a further improvement of the present invention, the mounting frame includes an upper body and a lower body, and a support rod connecting the upper body and the lower body, with the filter screen disposed between the upper body and the lower body.

[0035] A ring main unit includes a cabinet body, on which a ring main unit pressure relief device as described above is provided.

[0036] The beneficial effects of this invention are as follows:

[0037] 1. When an arc fault occurs in the gas chamber of the ring main unit, the arc will generate a large amount of heat, causing the gas temperature inside the ring main unit to rise and expand rapidly. High-pressure, high-temperature gas can enter the intake chamber, exhaust chamber, and pressure storage chamber through the first intake structure, quickly reducing the internal gas pressure of the ring main unit and preventing it from bursting due to the expanding gas. During the pressure relief process, the gas passes through a filter assembly, which effectively filters dust flowing into the pressure relief device from the ring main unit.

[0038] 2. Because the exhaust chamber is equipped with a cooling structure, the gas temperature can be quickly reduced, preventing the gas in the ring main unit from being in a high-temperature state for a long time, so as to ensure the long-term stable operation of the ring main unit.

[0039] 3. When the second exhaust structure is open, the high-pressure gas in the pressure storage chamber is driven by the pressure difference and blown directly towards the intake and exhaust chambers. This backflushes the filter assembly located between the intake and exhaust chambers, blowing off some of the deposits attached to the filter assembly. The vibration structure causes the filter assembly to vibrate. Combined with the backflushing, the vibration loosens the firmly attached blockages, and the backflushing air then blows the loosened blockages away from the filter assembly, achieving a good cleaning effect.

[0040] 4. The first intake structure, the first exhaust structure, and the second exhaust structure are interconnected.

[0041] When the first intake structure is in the open state, the first exhaust structure is in the closed state, thereby ensuring that high-temperature and high-pressure gas can enter the pressure storage chamber.

[0042] When the first exhaust structure is in the open state, the second exhaust structure is in the closed state, and when the first intake structure or the second exhaust structure is in the open state, the first exhaust structure is in the closed state, thereby ensuring that the high temperature and high pressure gas in the pressure storage chamber can flow into the intake chamber, thereby backflushing the filter components provided between the intake chamber and the exhaust chamber, and preventing dust from being blown back into the ring network cabinet. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1 This is a structural cross-sectional view of the present invention;

[0045] Figure 2 yes Figure 1 A magnified view of part A in the middle;

[0046] Figure 3 yes Figure 1 A magnified view of part B in the middle section;

[0047] Figure 4 yes Figure 1 A magnified view of part C in the middle;

[0048] Figure 5 This is a schematic diagram of the vibration initiation structure of the present invention.

[0049] Explanation of reference numerals in the attached figures:

[0050] 1-Outer shell, 11-First shell, 12-Second shell, 13-Third shell, 14-First valve seat, 15-Second valve seat, 2-Intake chamber, 21-First intake structure, 211-First intake port, 212-First intake valve core, 213-First elastic element, 214-First locking ball, 215-First actuating wall, 31-First exhaust structure, 311-First exhaust port, 312-First exhaust valve core, 313-First elastic element, 314-First limiting shoulder, 3-Exhaust chamber, 4-Pressure storage chamber, 41-Second intake structure, 411-Second intake port, 412-Second intake valve core, 413-Second elastic element, 414-Second locking ball, 42-Second exhaust Structure, 421-Second exhaust port, 422-Second exhaust valve core, 4221-Second actuating wall, 4222-Second limiting shoulder, 423-Second elastic element, 43-Compressed piston, 44-Adjusting piston, 45-First spring element, 46-Second spring element, 47-Second heat exchange element, 48-Thermal expansion material, 5-Filter assembly, 51-Mounting bracket, 511-Upper seat, 512-Lower seat, 52-Filter screen, 53-Reset elastic element, 54-Pin, 55-Support rod, 6-Cooling structure, 61-First heat exchange element, 62-Heat exchange tube, 7-Vibration structure, 71-Impeller, 72-Ratchet, 8-Transmission rod, 81-Third actuating wall, 82-Third limiting shoulder. Detailed Implementation

[0051] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this patent. To better illustrate this embodiment, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product.

[0052] It will be understood by those skilled in the art that certain well-known structures and their descriptions may be omitted in the accompanying drawings. The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0053] Reference Figure 1-5A pressure relief device for a ring main unit includes an outer shell 1. The outer shell 1 is provided with an air inlet chamber 2, an exhaust chamber 3 and a pressure storage chamber 4. The air inlet chamber 2 and the exhaust chamber 3 are respectively connected to a first air inlet structure 21 and a first exhaust structure 31. A filter assembly 5 is provided between the air inlet chamber 2 and the exhaust chamber 3. The pressure storage chamber 4 and the exhaust chamber 3 are connected to a second air inlet structure 41 and a second exhaust structure 42.

[0054] The first intake structure 21, the first exhaust structure 31, the second intake structure 41, and the second exhaust structure 42 are all one-way anti-reverse structures, and the first intake structure 21, the first exhaust structure 31, and the second exhaust structure 42 are linked together.

[0055] When the first intake structure 21 or the second exhaust structure 42 is in the open state, the first exhaust structure 31 is in the closed state.

[0056] When the first exhaust structure 31 is in the open state, the second exhaust structure 42 is in the closed state;

[0057] The exhaust chamber 3 is equipped with a cooling structure 6, which is used to cool the gas entering the exhaust chamber 3.

[0058] The filter assembly 5 is connected to a vibration-inducing structure 7, which is used to cause the filter assembly 5 to vibrate.

[0059] When an arc fault occurs in the gas chamber of the ring main unit, the arc generates a large amount of heat, causing the gas temperature inside the ring main unit to rise and expand rapidly. When the first air intake structure 21 is in the open state, the first exhaust structure 31 under the linkage setting is in the closed state, ensuring that the high-pressure, high-temperature gas directly enters the air intake chamber 2 and exhaust chamber 3 under the drive of the pressure difference, and pushes the second air intake structure 41 to switch to the open state so that the gas enters the pressure storage chamber 4, quickly reducing the gas pressure inside the ring main unit and preventing the ring main unit from being burst by the expanding gas. At the same time, since the exhaust chamber 3 is equipped with a cooling structure 6, it can quickly reduce the gas temperature, preventing the gas inside the ring main unit from being in a high-temperature state for a long time, so as to ensure the long-term stable operation of the ring main unit. During the depressurization process, the gas passes through the filter assembly 5, which can effectively filter the dust flowing into the pressure relief device from the ring main unit.

[0060] When the first exhaust structure 31 is in the open state, the second exhaust structure 42 is in the closed state, and when the first intake structure 21 or the second exhaust structure 42 is in the open state, the first exhaust structure 31 is in the closed state, thereby ensuring that the high temperature and high pressure gas in the pressure storage chamber 4 can flow into the intake chamber 2, thereby backflushing the filter assembly 5 provided between the intake chamber 2 and the exhaust chamber 3, blowing off some of the deposits attached to the filter assembly 5, and preventing dust from being blown back into the ring network cabinet.

[0061] The vibration structure 7 can cause the filter component 5 to vibrate. Combined with backflushing, the vibration can loosen the firmly attached blockages, and then the backflushing air can blow the loosened blockages away from the filter component 5, achieving a good cleaning effect.

[0062] Reference Figure 1 The outer shell 1 includes a first shell 11, a second shell 12 sleeved on the outside of the first shell 11, and a third shell 13 integrally connected to one end of the second shell 12;

[0063] An air intake chamber 2 is formed between the first housing 11 and the second housing 12, an exhaust chamber 3 is formed inside the second housing 12, and a pressure storage chamber 4 is formed inside the third housing 13.

[0064] The second housing 12 is fitted outside the first housing 11, and the cooling structure 6 is disposed inside the first housing 11. The second housing 12 can isolate a portion of the heat used for heat exchange, allowing the gas to fully contact the cooling structure 6 for heat exchange.

[0065] Reference Figure 1 The cooling structure 6 includes a first heat exchanger 61 disposed in the exhaust chamber 3, and a heat exchange tube 62 whose cold end is thermally connected to the first heat exchanger 61.

[0066] Specifically, the first heat exchanger 61 uses heat exchange fins to ensure sufficient heat exchange when the gas enters the exhaust chamber 3, and the heat is transferred from the exhaust chamber 3 to the pressure storage chamber 4 through the heat exchange tube 62. It should be noted that the gas in the exhaust chamber 3 is directly fed into the intake chamber 2, therefore the gas temperature in the intake chamber 2 is similar to that in the exhaust chamber 3. Specifically, the heat exchange tube 62 is disposed within the intake chamber 2. When the heat exchange tube 62 transfers heat, the structure of the second housing 12 sleeved outside the first housing 11 not only reduces heat loss during the transfer process, but also allows the gas in the intake chamber 2 to further exchange heat with the heat exchange tube 62.

[0067] Reference Figure 1 Inside the pressure storage chamber 4, a pressure piston 43 and an adjusting piston 44 are sequentially and slidably connected in a direction away from the exhaust chamber 3.

[0068] The end of the compressor piston 43 near the exhaust chamber 3 forms an air chamber with the pressure storage chamber 4. A first spring 45 is connected between the compressor piston 43 and the adjusting piston 44, and a second spring 46 is connected between the adjusting piston 44 and the pressure storage chamber 4.

[0069] The end of the adjusting piston 44 away from the exhaust chamber 3 forms a thermal expansion chamber with the pressure storage chamber 4. The thermal expansion chamber is provided with a second heat exchanger 47 and filled with thermal expansion material 48. The second heat exchanger 47 is thermally connected to the hot end of the heat exchange tube 62.

[0070] Specifically, the second heat exchanger 47 uses heat exchange fins. When heat is transferred to the second heat exchanger 47 through the heat exchange tube 62, it can quickly heat the thermal expansion chamber. As the temperature of the thermal expansion chamber rises, the thermal expansion material 48 continuously expands, driving the regulating piston 44 to move closer to the compressor piston 43, thus pressurizing the gas chamber. At this time, although the pressurized gas can push the second exhaust structure 42 to switch to the open state, because the first exhaust structure 31 and the second exhaust structure 42 are linked, the second exhaust structure 42 cannot switch to the open state when the first exhaust structure 31 is in the open state. This prevents the gas in the pressure storage chamber 4 from being directly discharged through the first exhaust structure 31 during the process of the first exhaust structure 31 switching to the open state, thus avoiding the gas in the pressure storage chamber 4 being directly discharged through the first exhaust structure 31 and unable to backflush the filter assembly 5.

[0071] Reference Figure 1 and 2 The outer casing 1 is provided with a first valve seat 14;

[0072] The first air intake structure 21 includes a first air intake hole 211 opened on the first valve seat 14, a first air intake valve core 212 that cooperates with the first air intake hole 211, and a first elastic member 213 connected to the first air intake valve core 212.

[0073] The first exhaust structure 31 includes a first exhaust hole 311 opened on the first valve seat 14, a first exhaust valve core 312 that cooperates with the first exhaust hole 311, and a first elastic member 313 connected to the first exhaust valve core 312.

[0074] A first locking ball 214 is movably connected to the first valve seat 14, a first actuating wall 215 is provided on the first intake valve core 212, and a first limiting shoulder 314 is provided on the first exhaust valve core 312.

[0075] When the first intake valve core 212 opens the first intake port 211, the first actuating wall 215 pushes the first locking ball 214 to a position where it abuts against the first limiting shoulder 314.

[0076] Specifically, the first valve seat 14 includes a first mounting cylinder disposed on the first housing 11 and a first seat body sleeved outside the first mounting cylinder. A first air inlet is disposed between the first mounting cylinder and the first seat body, and a first exhaust port 311 is disposed inside the first mounting cylinder. A mounting cavity is formed on the side wall of the first mounting cylinder, and a first locking ball 214 is disposed inside the mounting cavity.

[0077] The first intake structure 21 and the first exhaust structure 31 are designed so that when the pressure difference reaches a certain level, the gas, driven by the pressure difference, directly overcomes the elastic force of the first elastic element 213 or the first elastic member 313, pushing the first intake valve core 212 or the first exhaust valve core 312, thereby opening the first intake port 211 or the first exhaust port 311 for ventilation. Furthermore, when the gas in the ring main unit is under high temperature and high pressure, it will automatically push open the first intake valve core 212 to open the first intake port 211, achieving the technical effect of automatic pressure relief. Of course, an electrically driven method can also be used to open the ventilation.

[0078] Specifically, when the first intake valve core 212 opens the first intake port 211, the first actuating wall 215 pushes the first locking ball 214 to protrude from the inner wall of the first mounting cylinder, thereby abutting against the first limiting shoulder 314 to prevent the first exhaust valve core from moving.

[0079] Reference Figure 3 The outer casing 1 is provided with a second valve seat 15;

[0080] The second air intake structure 41 includes a second air intake hole 411 opened on the second valve seat 15, a second air intake valve core 412 that cooperates with the second air intake hole 411, and a second elastic member 413 connected to the second air intake valve core 412.

[0081] The second exhaust structure 42 includes a second exhaust hole 421 opened on the second valve seat 15, a second exhaust valve core 422 that cooperates with the second exhaust hole 421, and a second elastic member 423 connected to the second exhaust valve core 422.

[0082] The second valve seat 15 is movably connected to the second locking ball 414, the second exhaust valve core 422 is provided with the second actuating wall 4221 and the second limiting shoulder 4222, the first intake valve core 212 is connected to the transmission rod 8, and the transmission rod 8 is provided with the third actuating wall 81 and the third limiting shoulder 82.

[0083] When the first exhaust valve core 312 opens the first exhaust port 311, the third actuating wall 81 pushes the second locking ball 414 to the position where it abuts against the second limiting shoulder 4222.

[0084] When the second exhaust valve core 422 opens the second exhaust port 421, the second actuating wall 4221 pushes the second locking ball 414 to the position where it abuts against the third limiting shoulder 82.

[0085] Specifically, the second valve seat 15 includes a second mounting cylinder, a transmission connector disposed inside the second mounting cylinder, and a second seat body sleeved outside the second mounting cylinder. The second seat body is disposed on the inner side wall of the first housing 11. The second air inlet 411 is disposed between the second mounting cylinder and the second seat body. The second exhaust port 421 is disposed between the second mounting cylinder and the transmission connector. The second elastic member 423 is disposed on the transmission connector.

[0086] The second intake structure 41 and the second exhaust structure 42 are configured so that when the pressure difference reaches a certain level, the gas can directly overcome the reset force of the second elastic element 413 or the second elastic element 423 under the drive of the pressure difference and push open the second intake valve core 412 or the second exhaust valve core 422, thereby opening the second intake port 411 or the second exhaust port 421 for ventilation.

[0087] The transmission rod 8 and the second locking ball 414 enable a reliable mechanical linkage between the first exhaust structure 31 and the second exhaust structure 42, extending the service life under long-term high temperature and high pressure environments.

[0088] Specifically, when the first exhaust valve core 312 opens the first exhaust port 311, it drives the transmission rod 8 to move downward. The third actuation wall 81 pushes the second locking ball 414 to protrude from the inner wall of the transmission connector, thereby abutting against the second limiting shoulder 4222 to prevent the second exhaust valve core 422 from moving.

[0089] Reference Figure 1 , Figure 4 and Figure 5 The vibration-inducing structure 7 includes a rotatable impeller 71 and a plurality of ratchet teeth 72 evenly distributed on the outer edge of the impeller 71. The impeller 71 is located on the airflow trajectory of the second exhaust structure 42.

[0090] The filter assembly 5 includes a slidably mounted bracket 51, a filter screen 52 disposed on the mounting bracket 51, and a reset elastic member 53 connected to the mounting bracket 51. The mounting bracket 51 is provided with a pin 54 that is slidably connected to a ratchet 72.

[0091] In this embodiment, the impeller 71 is mounted on the inner wall of the first housing 11 via bearings. The mounting bracket 51 is slidably mounted on the inner wall of the first housing 11.

[0092] When the second exhaust valve core 422 opens the second exhaust port 421, the gas is blown towards the impeller 71 under the drive of the pressure difference, causing the impeller 71 to rotate. The reset elastic element drives the pin 54 to engage with the ratchet 72 with an inclined surface. When the impeller 71 rotates, the height of the mating surface between the pin 54 and the ratchet 72 changes continuously, causing the entire mounting frame 51 to vibrate up and down.

[0093] Reference Figure 4The mounting frame 51 includes an upper body 511 and a lower body 512, and a support rod 55 connecting the upper body 511 and the lower body 512. The filter screen 52 is disposed between the upper body 511 and the lower body 512.

[0094] Specifically, the filter 52 is made of HEPA material, and deformation of the filter 52 will directly lead to damage. Placing the support rod 55 between the upper body 511 and the lower body 512 allows the support rod 55 to bear most of the vibration force, preventing the force between the upper body 511 and the lower body 512 from being directly transmitted through the filter 52 when the filter assembly 5 vibrates up and down, thus extending the service life of the filter 52.

[0095] A ring main unit includes a cabinet body, on which a ring main unit pressure relief device as described above is provided.

[0096] When the gas in the ring main unit is under high temperature and pressure, the gas can overcome the elastic force of the first elastic element 213 to push open the first air inlet valve core 212 to open the first air inlet 211. When the first air inlet 211 is open, the first exhaust structure 31 under the linkage setting is in the closed state, ensuring that the high-pressure and high-temperature gas will directly enter the air inlet chamber 2 and exhaust chamber 3 under the drive of the pressure difference, and push the second air inlet structure 41 to switch to the open state so that the gas enters the pressure storage chamber 4, quickly reducing the gas pressure inside the ring main unit and preventing the ring main unit from being squeezed and burst by the expanding gas. At the same time, since the exhaust chamber 3 is equipped with a cooling structure 6, it can quickly reduce the temperature of the gas in the pressure relief device, thereby reducing the temperature of the ring main unit during exhaust, preventing the gas inside the ring main unit from being in a high-temperature state for a long time, so as to ensure the long-term stable operation of the ring main unit. At this time, it should be noted that the gas in the exhaust chamber 3 is directly flowing in from the gas in the air inlet chamber 2, so the gas temperature in the air inlet chamber 2 is similar to the gas temperature in the exhaust chamber 3. Therefore, when the heat exchange tube 62 transfers heat, the structure in which the second shell 12 is sleeved outside the first shell 11 not only reduces the loss during the heat transfer process, but also allows the gas in the air inlet chamber 2 to further exchange heat with the heat exchange tube 62.

[0097] During the depressurization process, the gas passes through the filter assembly 5, which can effectively filter the dust flowing into the depressurization device from the ring main unit.

[0098] After the internal and external air pressures are balanced, the first intake structure 21 and the second intake structure 41 are both closed. The first exhaust structure 31 switches to the open state, discharging the cooled and filtered gas from the intake chamber 2 and exhaust chamber 3, thereby reducing the temperature inside the ring main unit. The second exhaust structure 42 remains closed under the action of the transmission rod 8 and the second locking ball 414. At the same time, the cooling structure 6 transfers the absorbed heat to the thermal expansion material 48, causing the thermal expansion material 48 to increase in volume and push the adjusting piston 44 downward to increase the air pressure in the pressure storage chamber 4.

[0099] When the first exhaust structure 31 is switched to the closed state and the second exhaust structure 42 is switched to the open state, due to the linkage setting, when the second exhaust structure 42 is in the open state, the first exhaust structure 31 is in the closed state, and when the first intake structure 21 is in the open state, the first exhaust structure 31 is in the closed state. This ensures that the high-temperature and high-pressure gas in the pressure storage chamber 4 can flow into the intake chamber 2, thereby backflushing the filter assembly 5 located between the intake chamber 2 and the exhaust chamber 3, blowing off some of the deposits attached to the filter assembly 5, and preventing dust from being blown back into the ring network cabinet. At the same time, the blown gas drives the impeller 71 to rotate, and the reset elastic element drives the pin 54 to engage with the ratchet 72 with an inclined surface. When the impeller 71 rotates, the height of the mating surface between the pin 54 and the ratchet 72 changes continuously, causing the entire mounting frame 51 to vibrate up and down, dispersing the deposits on the filter screen 52, and the backflushing gas blows the dispersed blockages away from the filter screen 52.

[0100] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A ring main unit pressure relief device, characterized by, The shell is internally provided with an air inlet cavity, an air outlet cavity and a pressure storage cavity, the air inlet cavity and the air outlet cavity are respectively connected with a first air inlet structure and a first air outlet structure, a filter assembly is arranged between the air inlet cavity and the air outlet cavity, the pressure storage cavity and the air outlet cavity are connected with a second air inlet structure and a second air outlet structure; The first air inlet structure, the first air outlet structure, the second air inlet structure and the second air outlet structure are all one-way structures, and the first air inlet structure, the first air outlet structure, the second air outlet structure are linked together; When the first air inlet structure or the second air outlet structure is in an open state, the first air outlet structure is in a closed state; When the first air outlet structure is in an open state, the second air outlet structure is in a closed state; The air outlet cavity is provided with a cooling structure for cooling the gas entering the air outlet cavity; The filter assembly is connected with a vibration structure for vibrating the filter assembly.

2. The ring main unit pressure relief device according to claim 1, characterized in that, The shell comprises a first shell, a second shell sleeved outside the first shell, and a third shell integrally connected to one end of the second shell. The first shell and the second shell form the air inlet cavity, the second shell forms the air outlet cavity, and the third shell forms the pressure storage cavity.

3. The ring main unit pressure relief device according to claim 1, characterized in that, The cooling structure comprises a first heat exchange element arranged in the air outlet cavity, and a heat exchange pipe with a cold end and a hot end.

4. The ring main unit pressure relief device according to claim 3, wherein The pressure storage cavity is sequentially and sealingly connected with a pressure piston and an adjusting piston in a direction away from the air outlet cavity. The pressure piston is connected with the pressure storage cavity through a first spring element, and the adjusting piston is connected with the pressure storage cavity through a second spring element. The adjusting piston is connected with the pressure storage cavity through a heat expansion chamber, and the heat expansion chamber is filled with a heat expansion material and provided with a second heat exchange element.

5. The ring main unit pressure relief device according to claim 1, wherein The shell is provided with a first valve seat; The first air inlet structure comprises a first air inlet hole formed in the first valve seat, a first air inlet valve core matched with the first air inlet hole, and a first elastic element connected with the first air inlet valve core; The first air outlet structure comprises a first air outlet hole formed in the first valve seat, a first air outlet valve core matched with the first air outlet hole, and a first elastic element connected with the first air outlet valve core; The first valve seat is movably connected with a first locking bead, the first air inlet valve core is provided with a first actuating wall, and the first air outlet valve core is provided with a first limiting shoulder; When the first air inlet valve core opens the first air inlet hole, the first actuating wall pushes the first locking bead to a position abutting against the first limiting shoulder.

6. The ring main unit pressure relief device according to claim 5, wherein The shell is provided with a second valve seat; The second air inlet structure comprises a second air inlet hole formed in the second valve seat, a second air inlet valve core matched with the second air inlet hole, and a second elastic element connected with the second air inlet valve core; The second air outlet structure comprises a second air outlet hole formed in the second valve seat, a second air outlet valve core matched with the second air outlet hole, and a second elastic element connected with the second air outlet valve core; The second valve seat is movably connected with a second locking bead, the second exhaust valve core is provided with a second actuating wall and a second limiting shoulder, the first intake valve core is connected with a transmission rod, the transmission rod is provided with a third actuating wall and a third limiting shoulder; When the first exhaust valve core opens the first exhaust hole, the third actuating wall pushes the second locking bead to the position abutting against the second limiting shoulder; When the second exhaust valve core opens the second exhaust hole, the second actuating wall pushes the second locking bead to the position abutting against the third limiting shoulder.

7. The ring main unit pressure relief device according to claim 1, wherein The vibration starting structure comprises a wind wheel rotatably arranged, and a plurality of ratchets uniformly distributed on the outer edge of the wind wheel, and the wind wheel is located on the airflow track of the second exhaust structure. The filter assembly comprises a mounting frame slidably arranged, a filter screen arranged on the mounting frame, and a reset elastic member connected with the mounting frame, and the mounting frame is provided with a pin slidably connected with the ratchet.

8. The ring main unit pressure relief device according to claim 7, wherein The mounting frame comprises an upper seat body and a lower seat body, and a supporting rod connecting the upper seat body and the lower seat body, and the filter screen is arranged between the upper seat body and the lower seat body.

9. A ring main unit comprising a cabinet, characterized in that The cabinet body is provided with the ring main unit pressure relief device as claimed in any one of claims 1 to 8.

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