A modular air-cooling device for high-voltage cabinets and a high-voltage cabinet

Abstract

This invention discloses a modular air-cooling device and a high-voltage switchgear for high-voltage switchgear, relating to the field of high-voltage switchgear technology. Specifically, the modular air-cooling device for high-voltage switchgear includes a high-voltage switchgear and a heat dissipation box disposed on the top surface of the high-voltage switchgear. The heat dissipation box is equipped with a fan capable of supplying air from the outside into the high-voltage switchgear. A filter screen is disposed on the upper part of the inner circumference of the heat dissipation box, and a rotatable driven column is disposed at the center of the filter screen. Through the cooperation of the filter screen and a swaying scraping roller, circumferential scraping can be performed on the upper surface of the filter screen, effectively peeling off accumulated dust, fibers and other impurities and pushing them to the discharge port, ensuring the continuous unobstructed airflow channel. Through the cooperation of the airbag and multiple air jets opened on the circumference of the scraping roller, airflow can be sprayed outward during the reset movement of the scraping roller. The airflow impact thoroughly removes stubborn impurities adhering to the outer surface of the scraping roller, significantly enhancing the self-cleaning effect.

Description

Technical Field

[0001] This invention relates to the field of high-voltage switchgear technology, and more specifically, to a modular air-cooling device and a high-voltage switchgear for use in high-voltage switchgear. Background Technology

[0002] As the core equipment in the power system responsible for power distribution, control and protection, the high-voltage switchgear contains a large amount of Joule heat generated by the densely arranged electrical components such as circuit breakers, busbars and instrument transformers during continuous operation. With the increasing power load and the trend of equipment miniaturization, the heat flux density inside the high-voltage switchgear is constantly rising. If the heat cannot be dissipated in a timely and effective manner, it will lead to excessive temperature rise inside the switchgear, accelerate the aging of insulation materials, reduce the reliability and service life of electrical components, and in severe cases even cause insulation breakdown or arcing faults, posing a direct threat to the safe and stable operation of the power system. Therefore, configuring an efficient and reliable cooling device is an indispensable key element in the design of high-voltage switchgear. Forced air cooling has become one of the most widely used heat dissipation methods in high-voltage switchgear due to its simple structure, moderate cost, and convenient maintenance. A typical forced air cooling device usually includes a fan, a filter, and corresponding airflow channels. The fan introduces low-temperature outside air into the cabinet, which flows over the surface of the heating elements to carry away heat through convection. The heated air is then discharged outside the cabinet, forming a continuous heat dissipation cycle. However, high-voltage switchgear is mostly installed in industrial environments or outdoor sites, where the air generally contains various suspended particulate matter such as dust, metal dust, lint, and oily aerosols. To prevent these impurities from entering the cabinet with the cooling airflow and depositing on the surface of electrical components, causing insulation creep or short circuit hazards, the air inlet of the air cooling device must usually be equipped with a filter to purify the intake air. However, as the device continues to operate, a large amount of impurities will quickly accumulate on the filter, leading to filter blockage, increased airflow resistance, and reduced airflow, which in turn causes a serious decrease in heat dissipation capacity. Therefore, how to achieve effective self-cleaning of the filter and maintain the long-term unobstructed airflow channels has become a technical problem that urgently needs to be solved in the design of air cooling devices. To address the aforementioned issues, the industry has proposed various air-cooled device solutions with self-cleaning filter functions. For example, some existing technologies use rotating scrapers to mechanically scrape the filter surface in an attempt to remove accumulated impurities. However, such solutions still have significant technical limitations in actual operation: during continuous scraping, the surface of the scraping component itself will also form a highly bonded contaminant layer due to various interface effects such as mechanical compression, intermolecular van der Waals forces, electrostatic adsorption, and adhesion of oily media. These stubbornly attached impurities cause the cleaning efficiency of the scraping component to gradually decrease with prolonged operation, ultimately affecting the continuity and reliability of the filter's self-cleaning. This forces maintenance personnel to frequently shut down the power for manual disassembly and cleaning, increasing maintenance workload and equipment downtime losses. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a modular air-cooled device and a high-voltage switchgear for high-voltage switchgear, solving the problems mentioned in the background section.

[0004] The technical solution of this invention is as follows: To achieve the above objectives, the present invention provides the following technical solution: a modular air-cooling device for a high-voltage switchgear, comprising a high-voltage switchgear and a heat dissipation box disposed on the top surface of the high-voltage switchgear, wherein a fan capable of supplying air from the outside to the high-voltage switchgear is disposed inside the heat dissipation box, a filter screen is disposed on the upper part of the inner circumference of the heat dissipation box, and a rotatable driven column is disposed at the center of the filter screen, and a first rotating shaft capable of rotating is disposed at the top of the outer circumference of the driven column, and a swaying scraping roller is disposed on the outer circumference of the first rotating shaft, and a drop port is provided on the upper surface of the filter screen to cause impurities on the scraping roller to fall outward, and multiple air bladders capable of replenishing gas are disposed on the outer circumference of the first rotating shaft, and multiple air jets are evenly disposed on the circumference of the scraping roller.

[0005] Preferably, an installation plate is fixedly connected to the upper part of the inner circumference of the heat sink, the filter screen is fixedly connected to the installation plate, and an air inlet cylinder with its bottom end completely covered by the filter screen is fixedly connected to the upper surface of the installation plate. The top end of the air inlet cylinder is fixedly connected to the top surface of the high-voltage cabinet. Multiple air inlets that can communicate with the corresponding air inlets are opened at both ends of the upper surface of the high-voltage cabinet.

[0006] Preferably, a reducer is installed on the upper surface of the fan, a driven column is fixedly connected to the output shaft on the upper surface of the reducer, and the top of the driven column passes through the filter screen. A plurality of first springs are evenly fixedly connected to the outer circumferential surface of the first rotating shaft, and the ends of the plurality of first springs away from the first rotating shaft are all fixedly connected to the inner circumferential surface of the scraping roller.

[0007] Preferably, a driven plate is fixedly connected to the top of the outer peripheral surface of the driven column, both axial ends of the first rotating shaft pass through the inner side of the driven plate, and the first rotating shaft and the driven plate are rotatably connected. Both axial ends of the first rotating shaft are fitted with a reset torsion spring, one end of the reset torsion spring is fixedly connected to the first rotating shaft, and the other end of the reset torsion spring is fixedly connected to the driven plate.

[0008] Preferably, a guide plate with its top end completely covering the drop opening is fixedly connected to the lower surface of the mounting plate. The end of the guide plate away from the mounting plate is fixedly connected to the inner side of the heat sink box. A first dust outlet is opened on the side of the heat sink box that is in contact with the inner side of the high voltage cabinet. A second dust outlet that can communicate with the first dust outlet is opened on the upper part of the left and right sides of the high voltage cabinet.

[0009] Preferably, a first one-way communication component is provided on the side of the airbag near the inner circumferential surface of the scraping roller, and a plurality of second one-way communication components corresponding to the plurality of airbags are provided in the middle of the outer circumferential surface of the first rotating shaft, and compression components are provided at both ends of the axial direction inside the first rotating shaft.

[0010] Preferably, the first one-way communication component includes a first communication port opened on the side of the airbag away from the first rotating shaft, a first sealing plate slidably connected inside the first communication port, a second spring fixedly connected on the side of the first sealing plate near the first rotating shaft, and an auxiliary fixing concave plate that can wrap the first communication port fixedly connected to the inner side of the airbag, the end of the second spring away from the first sealing plate fixedly connected to the inner side of the auxiliary fixing concave plate, and a plurality of second communication ports opened on the auxiliary fixing concave plate.

[0011] Preferably, the second one-way communication component includes a second communication groove formed on the first rotating shaft, a second sealing plate is slidably connected in the second communication groove, and a third spring is fixedly connected to the side of the second sealing plate away from the scraping roller. The end of the third spring away from the second sealing plate is fixedly connected to the inner side of the second communication groove, and a plurality of fifth communication ports that can communicate with the space inside the first rotating shaft are formed on the inner side of the second communication groove.

[0012] Preferably, the compression component includes push plates slidably connected to both ends of the inner circumferential surface of the first rotating shaft. A fourth spring is fixedly connected to the opposite sides of the two push plates. The end of the fourth spring away from the push plate is fixedly connected to the inner side of the first rotating shaft. A limit connecting post is rotatably connected to the center of the two inner sides of the first rotating shaft. A connecting post is rotatably connected to the opposite ends of the two limit connecting posts. The end of the connecting post away from the limit connecting post passes through the corresponding push plate. The opposite ends of the two limit connecting posts pass through the first rotating shaft and are fixedly connected to the driven plate. Each of the two limiting connecting columns has a first connecting chamber at its opposite ends, and the inner side of the first connecting chamber has multiple first pressure relief ports. The connecting column has a first connecting groove on the side away from the limiting connecting column, and the inner side of the first connecting groove has multiple second pressure relief ports that can communicate with the first pressure relief ports. The center of the first connecting groove near the limiting connecting column has a protrusion with one end rotatably connected to the limiting connecting column. The limiting connecting column has a limiting groove on the side near the push plate, and a locking block that can limit the protrusion is fixedly connected in the limiting groove. Multiple third connecting ports are opened at both ends of the inner circumferential surface of the first rotating shaft, and multiple fourth connecting ports are evenly opened on the inner circumferential surface of the first connecting chamber.

[0013] A high-voltage switchgear includes a modular air-cooling unit for use with the high-voltage switchgear.

[0014] Beneficial effects This invention provides a modular air-cooled device and a high-voltage switchgear for use in high-voltage switchgear, which have the following advantages: This modular air-cooled device and high-voltage switchgear, through the combination of a filter screen and a wobbling scraper roller, can perform circumferential scraping on the upper surface of the filter screen, effectively peeling off accumulated dust, fibers, and other impurities and pushing them to the discharge port, ensuring the continuous unobstructed airflow channel. Through the combination of an airbag and multiple air jets on the circumferential surface of the scraper roller, airflow can be sprayed outward during the scraper roller's reset movement. The airflow impact thoroughly removes stubborn impurities adhering to the outer surface of the scraper roller, significantly enhancing the self-cleaning effect. Thus, driven by a single fan power source, it simultaneously achieves forced air cooling and heat dissipation inside the high-voltage switchgear, mechanical self-cleaning of the filter screen, and jet cleaning of the scraper roller, significantly improving the device's maintenance-free cycle and operational reliability. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the top cross-sectional structure of the high-voltage switchgear of the present invention from the rear view; Figure 3 This is a schematic diagram of the heat sink of the present invention; Figure 4 This is a top view of the air intake cylinder of the present invention; Figure 5 This is an enlarged structural schematic diagram of point A in the present invention; Figure 6 This is a schematic diagram of the cooperative structure of the scraping roller, the first spring, the airbag, and the first rotating shaft of the present invention; Figure 7 For the present invention Figure 6 Enlarged structural diagram at point B; Figure 8 This is a frontal cross-sectional view of the heat sink of the present invention; Figure 9 This is a top view of the cross-sectional structure of the first rotating shaft of the present invention; Figure 10 This is a schematic diagram of the cooperation structure of the limiting connecting column, the connecting column and the push plate of the present invention; Figure 11 This is a schematic diagram of the structure of the protrusion, the locking block, and the limiting groove of the present invention; Figure 12 This is a schematic diagram of the structure of the guide plate of the present invention.

[0016] In the diagram: 1. High-voltage cabinet; 2. Heat sink; 3. Second dust outlet; 4. Air inlet; 5. Filter screen; 6. Scraper roller; 7. Driven column; 8. Driven plate; 9. First dust outlet; 10. First rotating shaft; 11. Return torsion spring; 12. First spring; 13. Airbag; 14. Drop outlet; 15. Guide plate; 16. Fan; 17. First connecting port; 18. Second connecting groove; 19. First sealing plate; 20. Auxiliary fixing concave plate; 21. Second spring; 22. Second sealing plate; 23. Third spring; 24. Push plate; 25. Fourth spring; 26. Connecting column; 27. Third connecting port; 28. Fourth connecting port; 29. ​​First connecting chamber; 30. Air jet; 31. Limiting connecting column; 32. First pressure relief port; 33. First connecting groove; 34. Second pressure relief port. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0018] Example 1 To address the existing technical problems, the industry has proposed various air-cooled device solutions with self-cleaning filter functions. For example, some existing technologies use rotating scrapers to mechanically scrape the filter surface in an attempt to remove accumulated impurities. However, such solutions still have significant technical limitations in actual operation: during continuous scraping, the surface of the scraping component itself will also form a highly bonded contaminant layer due to various interface effects such as mechanical compression, intermolecular van der Waals forces, electrostatic adsorption, and adhesion of oily media. These stubbornly attached impurities cause the cleaning efficiency of the scraping component to gradually decrease with the extension of operating time, ultimately affecting the continuity and reliability of the filter's self-cleaning. This forces maintenance personnel to frequently shut down the power for manual disassembly and cleaning, increasing the workload of maintenance and equipment downtime losses. To solve the above problems, this embodiment is invented.

[0019] Please see Figures 1 to 12The present invention provides a technical solution: a modular air-cooling device for a high-voltage switchgear, comprising a high-voltage switchgear 1 and a heat dissipation box 2 disposed on the top surface of the high-voltage switchgear 1, wherein there are two heat dissipation boxes 2, which are respectively disposed at the left and right ends of the top surface of the high-voltage switchgear 1, and a fan 16 is provided in the heat dissipation box 2 to deliver air from the outside to the high-voltage switchgear 1. A filter screen 5 is disposed on the upper part of the inner circumferential surface of the heat dissipation box 2, and a rotatable driven column 7 is disposed at the center of the filter screen 5. A first rotating shaft 10 is disposed at the top of the outer circumferential surface of the driven column 7, and a swaying scraping roller 6 is disposed on the outer circumferential surface of the first rotating shaft 10. A drop port 14 is provided on the upper surface of the filter screen 5 to cause impurities on the scraping roller 6 to fall outward. A plurality of air bags 13 are disposed on the outer circumferential surface of the first rotating shaft 10 to replenish gas therein, and a plurality of air jets 30 are evenly disposed on the circumferential surface of the scraping roller 6. A mounting plate is fixedly connected to the upper part of the inner circumference of the heat sink 2. The filter screen 5 is fixedly connected to the mounting plate. An air inlet 4 with the bottom end completely covered by the filter screen 5 is fixedly connected to the upper surface of the mounting plate. The top end of the air inlet 4 is fixedly connected to the inner top surface of the high voltage cabinet 1. Multiple air inlets that can communicate with the corresponding air inlet 4 are opened at both ends of the upper surface of the high voltage cabinet 1. A protective plate is also fixedly connected to the upper surface of the high voltage cabinet 1, but the protective plate will not affect the normal air intake of the air inlet. Therefore, when the fan 16 starts running, the high-speed rotation of its internal impeller will create a negative pressure zone in the air inlet 4. As a result, the outside air is actively drawn in through the air inlet on the upper surface of the high-pressure cabinet 1 under the pressure difference and flows downward along the air inlet 4. Airflow passes through the filter screen 5 installed below the air inlet 4. The filter screen 5 effectively filters out dust, fibers and other particulate matter carried in the air through physical interception. The clean air then enters the inner cavity of the heat sink 2. Under the collection and guidance of the heat sink 2, the air forms a stable positive pressure zone in the heat sink 2 and is then continuously compressed into the internal space of the high voltage cabinet 1. When this continuously entering low-temperature air flows over the surface of various electrical components arranged in the high voltage cabinet 1, it carries away the heat generated by the components during operation through convection, achieving efficient cooling. Since the lower surface of the high voltage cabinet 1 has a heat dissipation vent, the heated air after heat exchange in the cabinet is pushed by the airflow and finally discharged smoothly from the heat dissipation vent. This creates a complete and orderly heat dissipation circulation path from external air intake, filtration and purification, forced cooling to hot air discharge, ensuring that the temperature rise in the cabinet is always within a controllable range. A reducer is installed on the upper surface of the fan 16. A driven column 7 is fixedly connected to the output shaft on the upper surface of the reducer. The rotating shaft inside the fan 16 drives the fan blades to rotate at high speed, and simultaneously inputs power to the reducer through the rotating shaft. The reducer uses the transmission ratio characteristics of its internal gear pair or worm pair to effectively reduce the high speed transmitted by the rotating shaft. The reduced power is smoothly transmitted to the driven column 7 from the output end of the reducer, thereby driving the driven column 7 to rotate continuously at a lower and more suitable speed. The top of the driven column 7 passes through the filter screen 5. A plurality of first springs 12 are evenly fixedly connected to the outer circumferential surface of the first rotating shaft 10. The ends of the plurality of first springs 12 away from the first rotating shaft 10 are all fixedly connected to the inner circumferential surface of the scraping roller 6. A plurality of first springs 12 are also evenly arranged in the axial direction of the first rotating shaft 10. A driven plate 8 is fixedly connected to the top of the outer peripheral surface of the driven column 7. The driven plate 8 is in the shape of an inverted U. Both axial ends of the first rotating shaft 10 pass through the inner side of the driven plate 8, and the first rotating shaft 10 and the driven plate 8 are rotatably connected. Both axial ends of the first rotating shaft 10 are fitted with a return torsion spring 11. One end of the return torsion spring 11 is fixedly connected to the first rotating shaft 10, and the other end of the return torsion spring 11 is fixedly connected to the driven plate 8. Therefore, when the driven column 7 starts to rotate, the driven plate 8 fixed to its top rotates synchronously, and drives the first rotating shaft 10 to revolve around the axis of the driven column 7 through the rotating connection point. Under the drive of the first rotating shaft 10, the scraping roller 6, which is elastically connected to it through multiple first springs 12, also revolves. Due to the flexibility of the first springs 12, it has a certain radial floating ability. When the outer circumferential surface of the scraping roller 6 contacts the upper surface of the filter screen 5, friction is immediately generated between the two. This friction acts on the scraping roller 6. The surface forms a torque that causes the first rotating shaft 10 to rotate relative to the driven plate 8. Under the action of this torque, the scraping roller 6 drives the first rotating shaft 10 to start rotating against the elastic resistance of the reset torsion spring 11. The reset torsion spring 11 is then twisted and accumulates elastic potential energy. As the rotation angle increases, the restoring torque generated by the reset torsion spring 11 increases linearly. According to the torque balance principle, when the torsional restoring torque increases to be equal to the driving torque generated by the friction force on the scraping roller 6, the rotation motion is limited and stops. After this, the scraping roller 6 no longer rotates relative to the driven plate 8, but is dragged by the driven plate 8 in a locked posture where it stops rotating, and continues to scrape the upper surface of the filter screen 5 in a circumferential manner. Since the contact between the scraping roller 6 and the filter screen 5 changes from rolling contact to sliding friction, its rough surface has a significant pushing and peeling effect on the dust, fibers and other accumulated impurities attached to the filter screen 5, thereby effectively scraping off the impurities and causing them to move towards the drop-out port 14 opened on the filter screen 5 under the assistance of centrifugal force and airflow, and finally being discharged, thus realizing the self-cleaning function of the filter screen 5 and ensuring the continuous unobstructed flow of air. The lower surface of the mounting plate is fixedly connected to a guide plate 15 whose top end completely covers the drop opening 14. The end of the guide plate 15 away from the mounting plate is fixedly connected to the inner side of the heat sink 2. The heat sink 2 is provided with a first dust outlet 9 on the side that is in contact with the inner side of the high voltage cabinet 1. The upper part of both the left and right sides of the high voltage cabinet 1 is provided with a second dust outlet 3 that can communicate with the first dust outlet 9. Therefore, when the impurities are scraped off and fall into the drop outlet 14, they immediately fall into the dust discharge channel formed by the guide plate 15. Thus, the impurities continue to slide along the inclined guide surface of the guide plate 15 and are directionally transported to the first dust outlet 9. Then, they are finally discharged from the high-voltage cabinet 1 through the second dust outlet 3 connected to it, thereby completing the fully enclosed external discharge of impurities and avoiding secondary pollution to the electrical components inside the cabinet. Meanwhile, as the scraping roller 6 gradually detaches from the surface of the filter screen 5 during its revolution, the frictional force exerted by the filter screen 5 on the scraping roller 6 disappears instantly, and the elastic potential energy previously accumulated by the reset torsion spring 11 is released. As a result, the reset torsion spring 11 drives the first rotating shaft 10 to quickly rotate in the opposite direction relative to the driven plate 8 to reset, thereby driving the scraping roller 6 to reset and rotate together. During the reset and rotation of the scraping roller 6, the residual impurities attached to its outer circumference are thrown off due to centrifugal force, achieving self-cleaning of the scraping roller 6. In addition, since the scraping roller 6 and the first rotating shaft 10 are connected flexibly by multiple first springs 12, during the instantaneous process of reset and torsion, the first springs 12 generate reciprocating vibration due to elastic deformation and stress release, thereby causing the scraping roller 6 to produce obvious radial shaking. This shaking effect can effectively destroy the adhesion between the impurities and the surface of the scraping roller 6, allowing the impurities to be shaken off the scraping roller 6 more thoroughly, thereby significantly improving the self-cleaning effect of the scraping roller 6 and ensuring that it maintains good scraping ability.

[0020] Example 2 In the above embodiments, although the centrifugal force can be used to throw away most impurities by means of the reverse reset process of the scraping roller 6, under actual working conditions, some impurities will form a highly bonded adhesion layer on the surface of the scraping roller 6 due to various microscopic effects such as mechanical compression, intermolecular van der Waals forces, electrostatic adsorption, and possible adhesion of oily media during the continuous frictional contact between the scraping roller 6 and the filter screen 5. The adhesion force generated by these interface adhesion effects is often greater than the centrifugal force that can be provided during the reset rotation. As a result, after the scraping roller 6 completes the reset rotation, a small amount of fine impurities are still firmly left on its outer surface, making it difficult to achieve thorough self-cleaning by simply swinging. This embodiment is invented to solve the above problems.

[0021] Please see Figures 1 to 12Based on the above embodiments, the technical solution adopted includes a first one-way communication component provided on the side of the airbag 13 near the inner circumferential surface of the scraping roller 6, a plurality of second one-way communication components corresponding one-to-one with the plurality of airbags 13 provided in the middle of the outer circumferential surface of the first rotating shaft 10, and compression components provided at both ends of the axial direction inside the first rotating shaft 10. The first one-way communication component includes a first communication port 17 opened on the side of the airbag 13 away from the first rotating shaft 10. A first sealing plate 19 is slidably connected inside the first communication port 17. A second spring 21 is fixedly connected to the side of the first sealing plate 19 near the first rotating shaft 10. An auxiliary fixing recess 20 that can wrap the first communication port 17 is fixedly connected to the inner side of the airbag 13. The end of the second spring 21 away from the first sealing plate 19 is fixedly connected to the inner side of the auxiliary fixing recess 20. A plurality of second communication ports are opened on the auxiliary fixing recess 20. Therefore, by setting the first connecting port 17, the air passage between the inner cavity of the airbag 13 and the annular gap area between the first rotating shaft 10 and the scraping roller 6 can be achieved structurally. At the same time, the first sealing plate 19 and the second spring 21 together constitute a spring pre-tightened one-way sealing structure: in the uninflated state, the pre-tightening force of the second spring 21 presses the first sealing plate 19 tightly against the inner side of the first connecting port 17, forming a reliable end face static seal. According to the pressure difference one-way conduction principle, this structure only allows gas to flow from the annular gap area into the inner cavity of the airbag 13, thereby ensuring the stability of the pressure storage function of the airbag 13. In addition, the multiple second connecting ports opened on the auxiliary fixing concave plate 20 can eliminate the blocking and sealing effect of the auxiliary fixing concave plate 20 on the first connecting port 17, ensuring that the airflow can smoothly pass through the auxiliary fixing concave plate 20 when flowing through the first connecting port 17, avoiding unnecessary local flow resistance loss due to structural obstruction, and making the air intake process more efficient and smooth. The second one-way communication component includes a second communication groove 18 opened on the first rotating shaft 10. A second sealing plate 22 is slidably connected in the second communication groove 18, and a third spring 23 is fixedly connected to the side of the second sealing plate 22 away from the scraping roller 6. The end of the third spring 23 away from the second sealing plate 22 is fixedly connected to the inner side of the second communication groove 18. A plurality of fifth communication ports that can communicate with the inner space of the first rotating shaft 10 are opened on the inner side of the second communication groove 18. Therefore, the preload of the third spring 23 presses the second sealing plate 22 tightly against the sealing end face of the second connecting groove 18, forming a reliable static seal and effectively blocking the reverse flow of gas. When the internal pressure of the airbag 13 increases due to the radial swaying of the scraping roller 6 and exceeds the critical opening pressure difference of the sum of the real-time pressure of the space inside the first rotating shaft 10 and the elastic force of the third spring 23, the airflow will actively push the second sealing plate 22 to overcome the constraint force of the third spring 23 and generate displacement, thereby forming a throttling annular gap between the second sealing plate 22 and the second connecting groove 18. At this time, the gas in the airbag 13 flows through the second connecting groove 18 and multiple fifth connecting ports in sequence under the pressure gradient drive, and is forcibly pressed into the internal cavity of the first rotating shaft 10, completing the unidirectional orderly transport of gas. The compression component includes push plates 24 that are slidably connected to both ends of the inner circumferential surface of the first rotating shaft 10. A fourth spring 25 is fixedly connected to the opposite sides of the two push plates 24. The end of the fourth spring 25 away from the push plate 24 is fixedly connected to the inner side of the first rotating shaft 10. The center of the two inner sides of the first rotating shaft 10 is rotatably connected to a limiting connecting post 31, and the opposite ends of the two limiting connecting posts 31 are rotatably connected to a connecting post 26. The end of the connecting post 26 away from the limiting connecting post 31 passes through the corresponding push plate 24. The push plate 24 can rotate and slide on the connecting post 26. The opposite ends of the two limiting connecting posts 31 pass through the first rotating shaft 10 and are fixedly connected to the driven plate 8. Each of the two limiting connecting posts 31 has a first connecting chamber 29 at its opposite ends, and the inner side of the first connecting chamber 29 has a plurality of first pressure relief ports 32. The connecting post 26 has a first connecting groove 33 on the side away from the limiting connecting post 31, and the inner side of the first connecting groove 33 has a plurality of second pressure relief ports 34 that can communicate with the first pressure relief ports 32. The center of the first connecting groove 33 near the limiting connecting post 31 has a protrusion with one end rotatably connected to the limiting connecting post 31. The limiting connecting post 31 has a limiting groove on the side near the push plate 24, and a locking block that can limit the protrusion is fixedly connected in the limiting groove. The inner circumferential surface of the first rotating shaft 10 has a plurality of third connecting ports 27 at both ends. The inner circumferential surface of the first connecting chamber 29 has a plurality of fourth connecting ports 28 evenly distributed. Meanwhile, sealing plates are fixedly connected to both ends of the scraping roller 6. Connecting rings are fixedly connected to the inner circumferential surface of the sealing plates. The connecting rings are rotatably connected to the first rotating shaft 10. Through this structure, the sealing plates can effectively seal the axial ends of the scraping roller 6, preventing gas from leaking outward from the axial ends of the scraping roller 6, thereby ensuring the blowing pressure of the jet nozzle 30. At the same time, the sealing plates are made of rubber material, which has good flexibility and elastic deformation ability. While achieving reliable sealing, they will not rigidly constrain the radial sway and rotation of the scraping roller 6 relative to the first rotating shaft 10, ensuring that the normal movement between the scraping roller 6 and the first rotating shaft 10 is not affected. Because the two push plates 24 and the inner wall of the first rotating shaft 10 form a axially sliding sealed interface, the internal space of the first rotating shaft 10 is dynamically divided into three non-communicating areas: the axial end pressure chambers located outside the two push plates 24, and the middle pressure accumulator chamber located between the two push plates 24, thus constructing a multi-chamber structure that meets the requirements of stepwise gas compression and directional delivery. At the same time, by opening multiple fourth connecting ports 28, the first connecting chamber 29 can be connected to the pressure chamber of the first rotating shaft 10, and by opening multiple third connecting ports 27, the pressure chamber of the first rotating shaft 10 can be connected to the space inside the scraping roller 6. When the first rotating shaft 10 rotates relative to the driven plate 8, a relative rotation occurs between the limiting connecting post 31 and the first rotating shaft 10. This rotation is transmitted through structural coupling, causing the rotation of the first rotating shaft 10 to synchronously drive the fourth spring 25, the push plate 24, and the connecting post 26 to rotate together. When the scraping roller 6 contacts the filter screen 5, to enhance the scraping effect, the first spring 12 between the first rotating shaft 10 and the scraping roller 6 is designed to be in a compressed and pre-tightened state (when the scraping roller 6 is on the upper surface of the filter screen 5). Therefore, during the revolution and rotation... During the combined rotation process, the radial displacement change between the scraping roller 6 and the first rotating shaft 10 compresses multiple airbags 13, thereby increasing the internal gas pressure of the airbags 13. Driven by the pressure difference, the gas is forced into the middle pressure storage chamber of the first rotating shaft 10 through the second one-way connecting component at the second connecting groove 18. The high-pressure gas entering the middle pressure storage chamber then applies a thrust to the two push plates 24, and the push plates 24 slide axially on the connecting column 26, realizing the adaptive change of the pressure storage chamber volume and the storage of pressure energy. Meanwhile, during the rotation of the first rotating shaft 10, the friction between the push plate 24 and the connecting column 26 generates a frictional torque, which drags the connecting column 26 to rotate. However, with the help of the limited angle limiting mechanism composed of the locking block and the protrusion, the connecting column 26 can only rotate 25 degrees to reach the mechanical stop. This angle limiting action makes the second pressure relief port 34 on the connecting column 26 and the first pressure relief port 32 on the limiting connecting column 31 staggered, thereby reliably sealing the middle pressure accumulator chamber. The gas is temporarily sealed in a high-pressure state. Furthermore, with the subsequent continuous rotation of the first rotating shaft 10, the push plate 24 will rotate with the connecting column 26. When the scraping roller 6 disengages from the filter screen 5, triggering the first rotating shaft 10 to reverse and reset, the push plate 24, under the combined action of the elastic restoring force of the fourth spring 25 and the internal air pressure, once again drags the connecting column 26 to rotate in the opposite direction by 25 degrees through friction, so that the second pressure relief port 34 and the first pressure relief port 32 are aligned and connected again. At this time, the high-pressure gas stored in the middle pressure accumulator chamber is rapidly discharged into the pressure chambers at both ends of the axial direction through the first connecting groove 33, the second pressure relief port 34, the first pressure relief port 32, the first connecting chamber 29, and the fourth connecting port 28, and then enters the inner cavity of the scraping roller 6 through the third connecting port 27. The airflow is ejected from the annular cavity and then ejected outward from each jet nozzle 30. This airflow directly impacts the stubborn impurities attached to the outer surface of the scraper roller 6, greatly increasing the peeling force on the impurities. At the same time, the jetting process is superimposed with the reset rotation of the scraper roller 6. The relative motion of the scraper roller 6 surface generates strong disturbance and entrainment on the ejected airflow, forming unsteady turbulent mixing. This significantly increases the velocity gradient and wind resistance between the airflow and the impurities, thereby destroying the adhesion forces that are difficult to overcome, such as interfacial adhesion and electrostatic adsorption, so that the impurities are completely removed and the scraper roller 6 continues to maintain excellent scraping performance. Meanwhile, when the airbag 13 enters the reset phase after being compressed, due to its rubber material and high elasticity, the airbag 13 expands outward under the drive of elastic recovery force, and its internal volume increases rapidly. According to the volume-pressure relationship, a significant negative pressure state is formed. At this time, the internal pressure of the airbag 13 is significantly lower than the external atmospheric pressure. The pressure difference generated is sufficient to overcome the pre-tightening force applied to the first sealing plate 19 by the second spring 21, thereby pushing the first sealing plate 19 to move axially, forming an annular air intake gap between it and the first connecting port 17. Under the drive of the pressure difference, the outside air is smoothly drawn into the inner cavity of the airbag 13 through this gap and the second connecting port on the auxiliary fixing concave plate 20, completing the automatic air replenishment process of the airbag 13 and providing sufficient air source guarantee for the next compression and pressure storage.

[0022] Please see Figure 1 The present invention provides a technical solution: a high-voltage switchgear, including a modular air-cooling device for the high-voltage switchgear. The structure of the high-voltage switchgear is consistent with the technical solutions disclosed in the prior art, and its working principle will not be described in detail here.

[0023] In summary, when the modular air-cooling device for the high-voltage switchgear is used, the continuous operation of the fan 16 creates an orderly airflow path from the air inlet 4 through the heat dissipation box 2 to the inside of the high-voltage switchgear 1, and finally out through the heat dissipation port on the lower surface of the high-voltage switchgear 1, thereby implementing forced convection cooling for various electrical components inside the high-voltage switchgear 1. During this process, dust and fiber impurities carried by the external air are filtered out by the filter screen 5. The driven column 7 drives the driven plate 8 to rotate under the drive of the fan 16 after the speed reduction of the reducer. This causes the scraping roller 6 to revolve around the axis of the driven column 7. Under the synergistic action of friction and the return torsion spring 11, the scraping roller 6 rotates and reverses to reset, scraping the impurities accumulated on the surface of the filter screen 5 to the drop port 14. The impurities are then discharged out of the cabinet through the guide plate 15 and the first dust outlet 9 and the second dust outlet 3, thus completing the self-cleaning of the filter screen 5. Meanwhile, during the rotation and reset process, the scraping roller 6 experiences radial swaying due to the flexible connection of the first spring 12, which periodically compresses the multiple airbags 13. The gas inside the airbags 13 is unidirectionally pressed into the pressure storage chamber in the middle of the first rotating shaft 10 through the first one-way connecting component and the second one-way connecting component, pushing the push plate 24 to slide on the connecting column 26 to achieve pressure storage. Under the control of the limited rotation angle limiting mechanism composed of the card block and the protrusion, the second pressure relief port 34 and the first pressure relief port 32 are switched by the forward and reverse 25-degree rotation of the connecting column 26. At the moment of reverse reset of the scraping roller 6, the high-pressure gas in the pressure storage chamber is released into the internal annular cavity of the scraping roller 6 through the first connecting groove 33, the first connecting chamber 29, the fourth connecting port 28, and the third connecting port 27, and finally ejected from each jet port 30. With the help of airflow impact, unsteady turbulent mixing and wind resistance effect generated by the reset rotation of the scraping roller 6, the stubborn impurities adhering to the surface of the scraping roller 6 are completely removed. Thus, driven by a single fan 16, the device simultaneously achieves forced heat dissipation inside the high-voltage cabinet 1, mechanical scraping self-cleaning of the filter screen 5, and jet cleaning self-cleaning of the scraping roller 6. The coordinated operation of these three functions effectively ensures the long-term unobstructed flow of airflow channels and the continuous stability of heat dissipation performance, significantly reducing the frequency of manual maintenance and operation and maintenance costs.

[0024] It should be noted that in the description of this invention, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0026] The above description is only a preferred embodiment of the present invention, but 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 inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A modular air-cooling device for a high-voltage cabinet, comprising a high-voltage cabinet (1) and a heat dissipation box (2) arranged on the top surface of the high-voltage cabinet (1), and a fan (16) arranged in the heat dissipation box (2) and capable of conveying air from the outside to the high-voltage cabinet (1), characterized in that: A filter screen (5) is provided on the upper part of the inner circumferential surface of the heat dissipation box (2), and a rotating driven column (7) is provided at the center of the filter screen (5). A first rotating shaft (10) is provided at the top of the outer circumferential surface of the driven column (7). A swaying scraping roller (6) is provided on the outer circumferential surface of the first rotating shaft (10). A drop port (14) is provided on the upper surface of the filter screen (5) to cause impurities on the scraping roller (6) to fall outward. A plurality of air bladders (13) are provided on the outer circumferential surface of the first rotating shaft (10) to replenish gas. A plurality of air jets (30) are evenly provided on the circumferential surface of the scraping roller (6).

2. A modular air cooling device for high voltage cabinets according to claim 1, characterized in that: An installation plate is fixedly connected to the upper part of the inner circumference of the heat sink (2). The filter screen (5) is fixedly connected to the installation plate, and an air inlet (4) with the bottom end completely covered by the filter screen (5) is fixedly connected to the upper surface of the installation plate. The top end of the air inlet (4) is fixedly connected to the inner top surface of the high voltage cabinet (1). Multiple air inlets that can communicate with the corresponding air inlet (4) are opened at both ends of the upper surface of the high voltage cabinet (1).

3. A modular air cooling device for high voltage cabinets according to claim 2, characterized in that: A speed reducer is installed on the upper surface of the fan (16). A driven column (7) is fixedly connected to the output shaft on the upper surface of the speed reducer, and the top of the driven column (7) passes through the filter screen (5). A plurality of first springs (12) are evenly fixedly connected to the outer circumference of the first rotating shaft (10). The ends of the plurality of first springs (12) away from the first rotating shaft (10) are all fixedly connected to the inner circumference of the scraping roller (6).

4. A modular air cooling device for high voltage cabinets according to claim 3, characterized in that: A driven plate (8) is fixedly connected to the top of the outer peripheral surface of the driven column (7). Both ends of the first rotating shaft (10) pass through the inner side of the driven plate (8), and the first rotating shaft (10) and the driven plate (8) are rotatably connected. Both ends of the first rotating shaft (10) are fitted with a reset torsion spring (11). One end of the reset torsion spring (11) is fixedly connected to the first rotating shaft (10), and the other end of the reset torsion spring (11) is fixedly connected to the driven plate (8).

5. A modular air cooling device for high voltage cabinets according to claim 4, characterized in that: The lower surface of the mounting plate is fixedly connected to a guide plate (15) whose top end completely covers the drop opening (14). The end of the guide plate (15) away from the mounting plate is fixedly connected to the inner side of the heat sink (2). The heat sink (2) is provided with a first dust outlet (9) on one side of the inner side of the high voltage cabinet (1). The upper part of the left and right sides of the high voltage cabinet (1) is provided with a second dust outlet (3) that can communicate with the first dust outlet (9).

6. A modular air-cooled device for a high-voltage switchgear according to claim 5, characterized in that: The airbag (13) is provided with a first one-way communication component on the side of the inner circumference of the scraping roller (6), and a plurality of second one-way communication components corresponding to the plurality of airbags (13) are provided in the middle of the outer circumference of the first rotating shaft (10). Compression components are provided at both ends of the axial direction inside the first rotating shaft (10).

7. A modular air-cooled device for a high-voltage switchgear according to claim 6, characterized in that: The first one-way communication component includes a first communication port (17) opened on the side of the airbag (13) away from the first rotating shaft (10), a first sealing plate (19) is slidably connected in the first communication port (17), a second spring (21) is fixedly connected on the side of the first sealing plate (19) close to the first rotating shaft (10), and an auxiliary fixing concave plate (20) that can wrap the first communication port (17) is fixedly connected on the inner side of the airbag (13), and one end of the second spring (21) away from the first sealing plate (19) is fixedly connected on the inner side of the auxiliary fixing concave plate (20), and a plurality of second communication ports are opened on the auxiliary fixing concave plate (20).

8. A modular air-cooled device for a high-voltage switchgear according to claim 7, characterized in that: The second one-way communication component includes a second communication groove (18) opened on the first rotating shaft (10), a second sealing plate (22) is slidably connected in the second communication groove (18), and a third spring (23) is fixedly connected to the side of the second sealing plate (22) away from the scraping roller (6). One end of the third spring (23) away from the second sealing plate (22) is fixedly connected to the inner side of the second communication groove (18), and a plurality of fifth communication ports that can communicate with the space inside the first rotating shaft (10) are opened on the inner side of the second communication groove (18).

9. A modular air-cooled device for a high-voltage switchgear according to claim 8, characterized in that: The compression component includes push plates (24) that are slidably connected to both ends of the inner circumferential surface of the first rotating shaft (10). A fourth spring (25) is fixedly connected to the opposite sides of the two push plates (24). The end of the fourth spring (25) away from the push plate (24) is fixedly connected to the inner side of the first rotating shaft (10). The center of the two inner sides of the first rotating shaft (10) is rotatably connected to a limiting connecting post (31). The opposite ends of the two limiting connecting posts (31) are rotatably connected to a connecting post (26). The end of the connecting post (26) away from the limiting connecting post (31) passes through the corresponding push plate (24). The opposite ends of the two limiting connecting posts (31) pass through the first rotating shaft (10) and are fixedly connected to the driven plate (8). Each of the two limiting connecting columns (31) has a first connecting chamber (29) at its opposite ends, and the inner side of the first connecting chamber (29) has a plurality of first pressure relief ports (32). The connecting column (26) has a first connecting groove (33) on the side away from the limiting connecting column (31), and the inner side of the first connecting groove (33) has a plurality of second pressure relief ports (34) that can communicate with the first pressure relief ports (32). The center of the first connecting groove (33) near the limiting connecting column (31) has a protrusion with one end rotatably connected to the limiting connecting column (31). The limiting connecting column (31) near the push plate (24) has a limiting groove, and a locking block that can limit the protrusion is fixedly connected in the limiting groove. The inner circumferential surfaces of the first rotating shaft (10) have a plurality of third connecting ports (27) at both ends. The inner circumferential surfaces of the first connecting chamber (29) have a plurality of fourth connecting ports (28) evenly distributed.

10. A high-voltage switchgear, characterized in that: The modular air-cooled device for high-voltage switchgear as described in any one of claims 1-9 above includes the device described in any one of claims 1-9 above.

Images