Ring main unit pressure relief device and ring main unit thereof

Abstract

The invention provides a ring main unit pressure relief device and a ring main unit. The ring main unit pressure relief device comprises a shell, and the shell is internally provided with an air inlet cavity, an exhaust cavity, a pressure storage cavity, a first air inlet structure, a first exhaust structure, a filter assembly, a second air inlet structure and a second exhaust structure; the first air inlet structure, the first exhaust structure, the second air inlet structure and the second exhaust structure are all one-way non-return structures, and the first air inlet structure, the first exhaust structure and the second exhaust structure are arranged in a linkage mode. A cooling structure is arranged in the exhaust cavity, and the cooling structure is used for cooling gas entering the exhaust cavity; the filtering assembly is connected with a vibration starting structure, and the vibration starting structure is used for making the filtering assembly vibrate. By the adoption of the structure, gas can be cooled, dust in the gas can be effectively filtered out, and the self-cleaning function of the filter screen is achieved.

Description

Technical Field

[0001] The invention relates to a pressure relief device and a ring network cabinet, in particular to a ring network cabinet pressure relief device and a ring network cabinet. Background Art

[0002] Ring main units (RMUs) are a very common type of electrical equipment. Existing RMUs often have a RMU chamber, which is filled with an insulating gas at a certain pressure to ensure safe operation. This insulating gas is often SF6, which has strong insulation and arc-extinguishing properties.

[0003] When an arc fault occurs in the gas chamber of a ring network cabinet, the arc will generate a large amount of heat, causing the temperature of the gas in the ring network cabinet to rise and expand rapidly. In order to prevent the ring network cabinet from being squeezed and exploded by the expanding gas, the ring network cabinet needs to be depressurized. At the same time, considering the need to avoid SF6 gas from being discharged and polluting the environment, and the need to restore the air pressure in the ring network cabinet to a predetermined range after the pressure relief is completed, most existing pressure relief devices use a sealed buffer chamber for pressure relief. Specifically, when an arc fault occurs, the high-temperature and high-pressure gas in the ring network cabinet enters the buffer chamber. After the air pressure in the ring network cabinet drops, the gas in the buffer chamber flows back into the ring network cabinet.

[0004] However, most current pressure relief devices lack cooling mechanisms and are unable to cool the gas in the buffer chamber. When the pressure inside the RMU drops, the hot gas in the buffer chamber flows into the RMU, keeping the gas inside the RMU at a high temperature for a long time, which is obviously not conducive to the stable operation of the RMU.

[0005] Furthermore, arc faults generate large amounts 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 settle inside the ring main unit, causing secondary contamination and potentially triggering subsequent electrical failures, impacting the insulation performance and operational reliability of the ring main unit. Traditional pressure relief devices typically incorporate simple filter assemblies to filter the relief gas, but these simple filter assemblies lack self-cleaning capabilities and are prone to clogging after prolonged use, compromising filtering effectiveness.

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

[0007] In order to overcome the existing technical problems, the present invention provides a ring network cabinet pressure relief device and a ring network cabinet thereof, which can cool the gas, effectively filter the dust in the gas, and realize the cleaning function of the filter itself.

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

[0009] A ring main unit pressure relief device comprises a housing, an air intake chamber, an exhaust chamber and a pressure storage chamber are provided in the housing, the air intake chamber and the exhaust chamber are respectively connected to a first air intake structure and a first exhaust structure, a filter assembly is provided between the air intake chamber and the exhaust chamber, and a second air intake structure and a second exhaust structure are connected between the pressure storage chamber and the exhaust chamber;

[0010] The first air intake structure, the first exhaust structure, the second air intake structure and the second exhaust structure are all one-way non-return structures, and the first air intake structure, the first exhaust structure and the second exhaust structure are arranged in linkage;

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

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

[0013] A cooling structure is provided in the exhaust cavity, and the cooling structure is used to cool the gas entering the exhaust cavity;

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

[0015] As a further improvement of the present invention, the housing includes a first shell, a second shell sleeved outside 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 shell and the second shell, an exhaust chamber is formed in the second shell, and a pressure storage chamber is formed in the third shell.

[0017] As a further improvement of the present invention, the cooling structure includes a first heat exchange element arranged in the exhaust cavity, and a heat exchange tube with a cold end thermally connected to the first heat exchange element.

[0018] As a further improvement of the present invention, a compression piston and an adjustment piston are sequentially and sealingly slidably connected in the pressure storage chamber in a direction away from the exhaust chamber;

[0019] An air chamber is formed between the end of the air compression piston close to the exhaust chamber and the pressure storage chamber, a first spring member is connected between the air compression piston and the regulating piston, and a second spring member is connected between the regulating piston and the pressure storage chamber;

[0020] A thermal expansion chamber is formed between the end of the regulating piston away from the exhaust chamber and the pressure storage chamber. A second heat exchange element is provided in the thermal expansion chamber and filled with thermal expansion material. The second heat exchange element 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 housing;

[0022] The first air intake structure includes a first air intake hole formed on the first valve seat, a first air intake valve core matched 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 formed on the first valve seat, a first exhaust valve core matched 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 air inlet valve core opens the first air inlet hole, the first actuating wall pushes the first locking ball to a position abutting against the first limiting shoulder.

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

[0027] The second air intake structure includes a second air intake hole formed on the second valve seat, a second air intake valve core matched with the second air intake hole, and a second elastic member connected to the second air intake valve core;

[0028] The second exhaust structure includes a second exhaust hole formed on the second valve seat, a second exhaust valve core matched with the second exhaust hole, and a second elastic member connected to the second exhaust valve core;

[0029] A second locking ball is movably connected to the second valve seat, a second actuating wall and a second limiting shoulder are provided on the second exhaust valve core, and a transmission rod is connected to the first intake valve core, and a third actuating wall and a third limiting shoulder are provided on the transmission rod;

[0030] When the first exhaust valve core opens the first exhaust hole, the third actuating wall pushes the second locking ball to a position abutting against the second limiting shoulder;

[0031] When the second exhaust valve core opens the second exhaust hole, the second actuating wall pushes the second locking ball to a position abutting against the third limiting shoulder.

[0032] As a further improvement of the present invention, the vibration-generating structure includes a rotatable wind wheel and a plurality of ratchets evenly distributed on the outer edge of the wind wheel, and the wind wheel is located on the airflow trajectory of the second exhaust structure;

[0033] The filter assembly comprises a slidably arranged mounting frame, a filter screen arranged on the mounting frame, and a reset elastic member connected with the mounting frame. The mounting frame is provided with a pin slidably connected with the ratchet.

[0034] As a further improvement of the present invention, the mounting frame includes an upper seat body and a lower seat body, and a support 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.

[0035] A ring main unit comprises a cabinet body, on which the above-mentioned ring main unit pressure relief device is provided.

[0036] The beneficial effects of the present invention are:

[0037] 1. When an arc fault occurs within the RMU's gas chamber, the arc generates a significant amount of heat, causing the gas temperature inside the RMU to rise and expand rapidly. High-pressure, high-temperature gas can enter the intake, exhaust, and pressure storage chambers through the first intake structure, rapidly reducing the internal pressure of the RMU and preventing it from being crushed and exploded by the expanding gas. During the pressure relief process, the gas passes through the filter assembly, effectively filtering dust from the RMU entering the pressure relief device.

[0038] 2. Since a cooling structure is provided in the exhaust chamber, the temperature of the gas can be quickly reduced, preventing the gas in the ring network cabinet from being in a high temperature state for a long time, so that the ring network cabinet can operate stably for a long time.

[0039] 3. When the second exhaust mechanism is in the open state, the high-pressure gas in the pressure storage chamber is driven by the high pressure differential and blown directly into the intake and exhaust chambers. This can back-blow the filter assembly located between the intake and exhaust chambers, blowing off some of the accumulated debris adhering to the filter assembly. The vibration mechanism causes the filter assembly to vibrate, and combined with the back-blow, the vibration can loosen firmly attached blockages. The back-blow air then blows the loosened blockage away from the filter assembly, achieving an excellent cleaning effect.

[0040] 4. The first air intake structure, the first exhaust structure and the second exhaust structure are arranged in linkage.

[0041] When the first air intake structure is in an open state, the first air exhaust structure is in a 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 air 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 air intake chamber, and then back-blow the filter assembly provided between the air intake chamber and the exhaust chamber, and will not blow dust back into the ring network cabinet. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

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

[0045] Figure 2 yes Figure 1 An enlarged view of the partial figure A in the middle;

[0046] Figure 3 yes Figure 1 An enlarged view of the partial image B in the middle;

[0047] Figure 4 yes Figure 1 An enlarged view of the partial image C in the middle;

[0048] Figure 5 It is a structural schematic diagram of the vibration-generating structure of the present invention.

[0049] Description of reference numerals:

[0050] 1-housing, 11-first housing, 12-second housing, 13-third housing, 14-first valve seat, 15-second valve seat, 2-inlet chamber, 21-first air intake structure, 211-first air intake hole, 212-first air intake valve core, 213-first elastic member, 214-first lock ball, 215-first actuating wall, 31-first exhaust structure, 311-first exhaust hole, 312-first exhaust valve core, 313-first elastic member, 314-first limiting shoulder, 3-exhaust chamber, 4-pressure storage chamber, 41-second air intake structure, 411-second air intake hole, 412-second air intake valve core, 413-second elastic member, 414-second lock ball, 42-second exhaust Structure, 421-second exhaust hole, 422-second exhaust valve core, 4221-second actuating wall, 4222-second limiting shoulder, 423-second elastic member, 43-compression piston, 44-adjusting piston, 45-first spring member, 46-second spring member, 47-second heat exchange member, 48-thermal expansion material, 5-filter assembly, 51-mounting frame, 511-upper seat, 512-lower seat, 52-filter screen, 53-reset elastic member, 54-pin, 55-support rod, 6-cooling structure, 61-first heat exchange member, 62-heat exchange tube, 7-vibration structure, 71-wind wheel, 72-ratchet, 8-transmission rod, 81-third actuating wall, 82-third limiting shoulder. DETAILED DESCRIPTION

[0051] The accompanying drawings are for illustrative purposes only and should not be construed as limiting this patent. In order to better illustrate this embodiment, certain components of the accompanying drawings may be omitted, enlarged, or reduced in size, and do not represent the actual size of the product.

[0052] It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. The technical solution of the present invention will be further described below in conjunction with the drawings and embodiments.

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

[0054] The first air intake structure 21, the first exhaust structure 31, the second air intake structure 41 and the second exhaust structure 42 are all one-way non-return structures, and the first air intake structure 21, the first exhaust structure 31 and the second exhaust structure 42 are arranged in linkage;

[0055] When the first air intake structure 21 or the second air exhaust structure 42 is in the open state, the first air 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] A cooling structure 6 is provided in the exhaust cavity 3, and the cooling structure 6 is used to cool the gas entering the exhaust cavity 3;

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

[0059] When an arc fault occurs in the air chamber of the ring network cabinet, the arc will generate a large amount of heat, causing the temperature of the gas in the ring network cabinet 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 and high-temperature gas will directly enter the air intake chamber 2 and the exhaust chamber 3 driven by the air pressure difference, and push the second air intake structure 41 to switch to the open state to allow the gas to enter the pressure storage chamber 4, quickly reducing the air pressure inside the ring network cabinet and preventing the ring network cabinet from being squeezed and exploded by the expanding gas. At the same time, since a cooling structure 6 is provided in the exhaust chamber 3, the temperature of the gas can be quickly reduced, preventing the gas in the ring network cabinet from being in a high-temperature state for a long time, so that the ring network cabinet can operate stably for a long time. During the pressure relief process, the gas can effectively filter the dust flowing into the pressure relief device from the ring network cabinet through the filter assembly 5.

[0060] When the first exhaust structure 31 is in an open state, the second exhaust structure 42 is in a closed state, and when the first air intake structure 21 or the second air intake structure 42 is in an open state, the first exhaust structure 31 is in a closed state, thereby ensuring that the high-temperature and high-pressure gas in the pressure storage chamber 4 can flow into the air intake chamber 2, and then back-blow the filter assembly 5 provided between the air intake chamber 2 and the exhaust chamber 3, blowing off some of the deposits attached to the filter assembly 5, and not blowing the dust back into the ring network cabinet.

[0061] The vibration structure 7 can make the filter component 5 vibrate. Combined with backblowing, the vibration can loosen firmly attached blockages, and then the loosened blockages are blown away from the filter component 5 by backblowing, achieving a good cleaning effect.

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

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

[0064] The second shell 12 is sleeved on the outside of the first shell 11, and the cooling structure 6 is arranged in the first shell 11. The second shell 12 can isolate part of the heat used for heat exchange, so that the gas can fully contact the cooling structure 6 for heat exchange.

[0065] Reference Figure 1 The cooling structure 6 includes a first heat exchange member 61 disposed in the exhaust cavity 3 , and a heat exchange pipe 62 having a cold end thermally connected to the first heat exchange member 61 .

[0066] Specifically, the first heat exchange element 61 utilizes heat exchange fins, enabling sufficient heat exchange when the gas enters the exhaust chamber 3. Heat is then transferred from the exhaust chamber 3 to the pressure storage chamber 4 via the heat exchange tube 62. It should be noted that the gas entering the exhaust chamber 3 flows directly from the gas within the intake chamber 2, so the temperature of the gas in the intake chamber 2 is similar to that of the gas within 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 in which the second shell 12 is sheathed outside the first shell 11 not only reduces heat loss during the transfer process, but also allows the gas within the intake chamber 2 to further exchange heat with the heat exchange tube 62.

[0067] Reference Figure 1 The pressure storage chamber 4 is sealed and slidably connected with a compression piston 43 and a regulating piston 44 in sequence in a direction away from the exhaust chamber 3;

[0068] An air chamber is formed between the end of the compression piston 43 close to the exhaust chamber 3 and the pressure storage chamber 4. A first spring member 45 is connected between the compression piston 43 and the regulating piston 44, and a second spring member 46 is connected between the regulating piston 44 and the pressure storage chamber 4.

[0069] A thermal expansion chamber is formed between the end of the regulating piston 44 away from the exhaust chamber 3 and the pressure storage chamber 4. A second heat exchange element 47 is provided in the thermal expansion chamber and filled with thermal expansion material 48. The second heat exchange element 47 is thermally connected to the hot end of the heat exchange tube 62.

[0070] Specifically, the second heat exchange member 47 uses heat exchange fins. When heat is transferred to the second heat exchange member 47 through the heat exchange tube 62, the thermal expansion chamber can be quickly heated. When the temperature of the thermal expansion chamber rises, the thermal expansion material 48 continues to expand, driving the regulating piston 44 to move closer to the compression piston 43, driving the air chamber to pressurize. At this time, although the pressurized gas can push the second exhaust structure 42 to switch to the open state, since the first exhaust structure 31 and the second exhaust structure 42 have a linkage setting, when the first exhaust structure 31 is in the open state, the second exhaust structure 42 cannot switch to the open state. In order to avoid the process of the first exhaust structure 31 switching to the open state, the air chamber is pressurized to a certain extent to push the second exhaust structure 42 to switch to the open state, thereby causing the gas in the pressure storage chamber 4 to be discharged directly through the first exhaust structure 31, and the filter component 5 cannot be backblown.

[0071] Reference Figure 1 and 2 , a first valve seat 14 is provided on the housing 1;

[0072] The first air intake structure 21 includes a first air intake hole 211 formed on the first valve seat 14, a first air intake valve core 212 matched 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 formed on the first valve seat 14 , a first exhaust valve core 312 engaged 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 air inlet valve core 212 opens the first air inlet hole 211 , the first actuating wall 215 pushes the first locking ball 214 to a position abutting against the first limiting shoulder 314 .

[0076] Specifically, the first valve seat 14 includes a first mounting tube mounted on the first housing 11 and a first seat body sleeved outside the first mounting tube. The first air inlet is located between the first mounting tube and the first seat body, and the first exhaust hole 311 is located within the first mounting tube. A mounting cavity is defined in the sidewall of the first mounting tube, and the first locking ball 214 is located within the mounting cavity.

[0077] The first air intake structure 21 and the first air exhaust structure 31 are configured such that, when the air pressure differential reaches a certain level, the gas, driven by the air pressure differential, directly overcomes the elastic force of the first elastic member 213 or the first elastic member 313 to push the first air intake valve core 212 or the first air exhaust valve core 312, thereby opening the first air intake hole 211 or the first air exhaust hole 311 for ventilation. Furthermore, when the air in the ring main unit is at high temperature and high pressure, the first air intake valve core 212 is automatically pushed open to open the first air intake hole 211, achieving the technical effect of automatic pressure relief. Of course, an electric drive can also be used to open the ventilation.

[0078] Specifically, when the first intake valve core 212 opens the first intake hole 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 , a second valve seat 15 is provided on the housing 1;

[0080] The second air intake structure 41 includes a second air intake hole 411 formed on the second valve seat 15, a second air intake valve core 412 matched 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 formed on the second valve seat 15 , a second exhaust valve core 422 engaged with the second exhaust hole 421 , and a second elastic member 423 connected to the second exhaust valve core 422 .

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

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

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

[0085] Specifically, the second valve seat 15 includes a second mounting cylinder, a transmission connecting piece arranged in the second mounting cylinder, and a second seat body arranged outside the second mounting cylinder. The second seat body is arranged on the inner wall of the first shell 11, the second air inlet 411 is arranged between the second mounting cylinder and the second seat body, the second exhaust hole 421 is arranged between the second mounting cylinder and the transmission connecting piece, and the second elastic piece 423 is arranged on the transmission connecting piece.

[0086] The setting of the second air intake structure 41 and the second exhaust structure 42 enables the gas to directly overcome the return elastic force of the second elastic member 413 or the second elastic member 423 to push open the second air intake valve core 412 or the second exhaust valve core 422 when the air pressure difference reaches a certain level, thereby opening the second air intake hole 411 or the second exhaust hole 421 for ventilation.

[0087] The arrangement of the transmission rod 8 and the second locking bead 414 can generate a reliable mechanical linkage relationship between the first exhaust structure 31 and the second exhaust structure 42, thereby extending the working life in a long-term high temperature and high pressure environment.

[0088] Specifically, the first exhaust valve core 312 opens the first exhaust hole 311 and drives the transmission rod 8 to move downward, pushing the second lock ball 414 to protrude from the inner wall of the transmission connection through the third actuating wall 81, thereby abutting 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 structure 7 includes a rotatable wind wheel 71 and a plurality of ratchet teeth 72 evenly distributed on the outer edge of the wind wheel 71. The wind wheel 71 is located on the airflow trajectory of the second exhaust structure 42.

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

[0091] In this embodiment, the wind wheel 71 is disposed on the inner side wall of the first housing 11 via a bearing. The mounting bracket 51 is slidably disposed on the inner side wall of the first housing 11.

[0092] When the second exhaust valve core 422 opens the second exhaust hole 421, the air is blown toward the wind wheel 71 by the pressure difference, causing the wind wheel 71 to rotate. The reset elastic member drives the pin 54 to fit on the inclined ratchet 72. As the wind wheel 71 rotates, the height of the mating surface between the pin 54 and the ratchet 72 continuously changes, 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 , and the filter screen 52 is arranged 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 share 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, thereby extending the service life of the filter 52.

[0095] A ring main unit comprises a cabinet body, on which the above-mentioned ring main unit pressure relief device is provided.

[0096] When the gas in the ring network cabinet is in a state of high temperature and high pressure, the gas can overcome the elastic force of the first elastic member 213 to push open the first air inlet valve core 212 to open the first air inlet hole 211. When the first air inlet hole 211 is opened, the first exhaust structure 31 under the linkage setting is in a closed state, ensuring that the high-pressure and high-temperature gas will directly enter the air inlet chamber 2 and the exhaust chamber 3 driven by 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 air pressure inside the ring network cabinet and preventing the ring network cabinet from being squeezed and exploded by the expanding gas. At the same time, since a cooling structure 6 is provided in the exhaust chamber 3, the temperature of the gas in the pressure relief device can be quickly reduced, and then the temperature of the ring network cabinet can be reduced during exhaust, avoiding the gas in the ring network cabinet from being in a high temperature state for a long time, so that the ring network cabinet can operate stably for a long time. At this time, it should be noted that the gas in the exhaust chamber 3 flows directly 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 on the outside of the first shell 11 can not only reduce the loss during the heat transfer process, but also the gas in the air intake cavity 2 can further exchange heat with the heat exchange tube 62.

[0097] During the pressure relief process, the gas passing through the filter assembly 5 can effectively filter the dust flowing into the pressure relief device from the ring main unit.

[0098] After the internal and external air pressures reach equilibrium, the first air intake structure 21 is closed, and the second air intake structure 41 is closed. The first exhaust structure 31 switches to the open state, discharging the cooled and filtered air from the air intake chamber 2 and the exhaust chamber 3, thereby reducing the temperature inside the ring main unit. The second exhaust structure 42 remains closed due to 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, increasing its volume and pushing the regulating piston 44 downward to increase the air pressure in the pressure storage chamber 4.

[0099] The first exhaust structure 31 switches to a closed state, and the second exhaust structure 42 switches to an open state. Due to the linkage setting, when the second exhaust structure 42 is in an open state, the first exhaust structure 31 is in a closed state, and when the first air intake structure 21 is in an open state, the first exhaust structure 31 is in a closed state, thereby ensuring that the high-temperature and high-pressure gas in the pressure storage chamber 4 can flow into the air intake chamber 2, and then back-blow the filter assembly 5 provided between the air intake chamber 2 and the exhaust chamber 3, blowing off some of the deposits attached to the filter assembly 5, and not blowing dust back into the ring network cabinet. At the same time, the blown gas drives the wind wheel 71 to rotate, and the reset elastic member drives the pin 54 to fit on the ratchet 72 with an inclined surface. When the wind wheel 71 rotates, the height of the matching surface between the pin 54 and the ratchet 72 changes continuously, driving the entire mounting frame 51 to vibrate up and down, shaking off the deposits on the filter screen 52, and blowing the shaken blockage away from the filter screen 52 through the back-blown gas.

[0100] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A ring main unit pressure relief device, characterized in that: The invention comprises a housing, wherein an air intake chamber, an exhaust chamber and a pressure storage chamber are provided in the housing, wherein the air intake chamber and the exhaust chamber are respectively connected to a first air intake structure and a first exhaust structure, a filter assembly is provided between the air intake chamber and the exhaust chamber, and a second air intake structure and a second exhaust structure are connected between the pressure storage chamber and the exhaust chamber; The first air intake structure, the first exhaust structure, the second air intake structure and the second exhaust structure are all one-way non-return structures, and the first air intake structure, the first exhaust structure and the second exhaust structure are arranged in linkage; When the first air intake structure or the second air exhaust structure is in an open state, the first air exhaust structure is in a closed state; When the first exhaust structure is in an open state, the second exhaust structure is in a closed state; A cooling structure is provided in the exhaust cavity, and the cooling structure is used to cool the gas entering the exhaust cavity; The filter assembly is connected to a vibration-generating structure, and the vibration-generating structure is used to vibrate the filter assembly.

2. A ring main unit pressure relief device according to claim 1, characterized in that: The housing 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; An air intake chamber is formed between the first shell and the second shell, an exhaust chamber is formed in the second shell, and a pressure storage chamber is formed in the third shell.

3. The ring main unit pressure relief device according to claim 1, characterized in that: The cooling structure includes a first heat exchange component arranged in the exhaust cavity, and a heat exchange tube with a cold end thermally connected to the first heat exchange component.

4. A ring main unit pressure relief device according to claim 3, characterized in that: The pressure storage chamber is sealed and slidably connected with a gas compression piston and a regulating piston in sequence in a direction away from the exhaust chamber; An air chamber is formed between the end of the air compression piston close to the exhaust chamber and the pressure storage chamber, a first spring member is connected between the air compression piston and the regulating piston, and a second spring member is connected between the regulating piston and the pressure storage chamber; A thermal expansion chamber is formed between the end of the regulating piston away from the exhaust chamber and the pressure storage chamber. A second heat exchange element is provided in the thermal expansion chamber and filled with thermal expansion material. The second heat exchange element is thermally connected to the hot end of the heat exchange tube.

5. The ring main unit pressure relief device according to claim 1, characterized in that: The housing is provided with a first valve seat; The first air intake structure includes a first air intake hole formed on the first valve seat, a first air intake valve core matched with the first air intake hole, and a first elastic member connected to the first air intake valve core; The first exhaust structure includes a first exhaust hole formed on the first valve seat, a first exhaust valve core matched with the first exhaust hole, and a first elastic member connected to the first exhaust valve core; 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; When the first air intake valve core opens the first air intake hole, the first actuating wall pushes the first locking ball to a position abutting against the first limiting shoulder.

6. The ring main unit pressure relief device according to claim 5, characterized in that: A second valve seat is provided on the housing; The second air intake structure includes a second air intake hole formed on the second valve seat, a second air intake valve core matched with the second air intake hole, and a second elastic member connected to the second air intake valve core; The second exhaust structure includes a second exhaust hole formed on the second valve seat, a second exhaust valve core matched with the second exhaust hole, and a second elastic member connected to the second exhaust valve core; The second valve seat is movably connected to a second lock ball, the second exhaust valve core is provided with a second actuating wall and a second limiting shoulder, the first intake valve core is connected to a transmission rod, and 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 lock ball to a 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 ball to a position abutting against the third limiting shoulder.

7. The ring main unit pressure relief device according to claim 1, characterized in that: The vibration-generating structure includes a rotatable wind wheel and a plurality of ratchets evenly distributed on the outer edge of the wind wheel, and the wind wheel is located on the airflow trajectory of the second exhaust structure; The filter assembly includes a slidably arranged mounting frame, a filter screen arranged on the mounting frame, and a reset elastic member connected to the mounting frame. The mounting frame is provided with a pin slidably connected to the ratchet.

8. The ring main unit pressure relief device according to claim 7, characterized in that: The mounting frame includes an upper seat body, a lower seat body, and a support 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 body, characterized in that: The cabinet body is provided with a ring main unit pressure relief device according to any one of claims 1 to 8.

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