A low noise oil immersed transformer

Abstract

The application relates to the technical field of transformers, in particular to a low-noise oil-immersed transformer which comprises a transformer body, an oil pillow fixedly communicated with the top surface of the transformer body, a breathing pipeline fixedly communicated with the bottom of the oil pillow, a gas guide tank, the top of the gas guide tank being fixedly communicated with the breathing pipeline, an exhaust valve arranged on the surface of the gas guide tank, a sliding rail fixedly arranged at the bottom of the gas guide tank, and a supporting disc fixedly arranged at the bottom of the sliding rail. When the lower drying tank is fully saturated, the air inlet valve of the lower drying tank is closed, and the air inlet valve of the upper drying tank is opened, so that the gas only passes through the upper drying tank to work, the separate dehumidification of the upper drying tank is realized, the dehumidification function is not interrupted during the replacement process, the breathing port needs to be closed or the situation is avoided, the normal breathing function of the transformer is ensured, and the adverse influence caused by the closed breathing port is reduced.

Description

Technical Field

[0001] This invention relates to the field of transformers, and more particularly to a low-noise oil-immersed transformer. Background Technology

[0002] Oil-immersed transformers are mainly composed of iron core, windings, oil tank, oil conservator, insulating bushings, radiators, and dehumidifiers. Their windings are wrapped in insulating oil, and the damping effect of the oil can effectively buffer the transmission of vibrations caused by electromagnetic forces. The insulating oil can significantly attenuate vibration energy, making the noise level of oil-immersed transformers generally lower than that of dry-type transformers of the same capacity, thus meeting the needs of noise-sensitive scenarios such as urban power distribution and residential areas.

[0003] In existing oil-immersed transformers, the desiccant is connected to the oil conservator. The desiccant is filled with color-changing desiccant particles to filter the air entering the oil conservator and keep the oil dry. This type of desiccant changes color after absorbing moisture from the air, thus visually reflecting the moisture absorption status. When the desiccant's range of change reaches a preset range, for example, when it reaches two-thirds of the total height of the desiccant, the remaining part of the desiccant is not saturated and cannot achieve effective dehumidification performance, so it must be replaced in time.

[0004] As the above examples show, when replacing the desiccant, if one-third of the desiccant remains saturated, replacing it all at once results in material waste. Furthermore, replacing the desiccant usually requires temporarily closing the absorber's vent to prevent undried air from directly entering the transformer oil conservator. However, this brief closure disrupts the pressure balance between the transformer's interior and the outside environment. ， This may cause a brief period of negative or positive pressure in the oil tank, which in turn affects the circulation and heat dissipation efficiency of the transformer oil. It is evident that the existing transformer air intake still has considerable room for improvement. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies, such as material waste when replacing desiccant and the need to close the vent, and to propose a low-noise oil-immersed transformer.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a low-noise oil-immersed transformer, comprising a transformer body, an oil conservator fixedly connected to the top surface of the transformer body, a breathing pipe fixedly connected to the bottom of the oil conservator, and further comprising: An air delivery canister, the top of which is fixedly connected to a breathing tube, and an exhaust valve is provided on the surface of the air delivery canister; A slide rail is fixed to the bottom of the air delivery tank, and a support plate is fixed to the bottom of the slide rail; Two docking plates are vertically slidably connected to the slide rail. An air outlet valve and an air inlet valve are fixed sequentially on the surface of the two docking plates from top to bottom. The air inlet valve is connected to the space below the slide rail through an elastic pipe, and the air outlet valve is connected to the air guide tank through an elastic pipe. Two drying tanks are stacked on a support plate. The drying tanks are magnetically connected to the docking plate via a magnetic suction assembly. Two docking holes are provided on the side wall of each drying tank, which are respectively connected to the air inlet valve and the air outlet valve. Both the top and bottom surfaces of each drying tank are provided with connecting grooves. The connecting groove at the bottom of the upper drying tank is connected to the connecting groove at the top of the lower drying tank.

[0007] Specifically, in this invention, each drying tank is filled with the same amount of desiccant as conventional desiccants. This ensures that the upper drying tank maintains reliable dehumidification performance during the replacement of the lower drying tank, thus guaranteeing that the lower drying tank can be replaced only after it is fully saturated, avoiding waste of desiccant. Once the lower drying tank is fully saturated, its inlet valve is closed first, while the inlet valve of the upper drying tank is opened simultaneously. This allows gas to pass through only the upper drying tank, enabling independent dehumidification of the upper drying tank. This prevents interruption of dehumidification during replacement, avoiding situations where the vent needs to be closed, thus ensuring the normal breathing function of the transformer and reducing the risk of vent closure. The following measures mitigate the adverse effects: Due to the magnetic connection between the dryer and the docking plate, the lower dryer can be manually removed to detach from the docking plate. Then, the upper dryer is moved downwards, and the lower docking plate is moved upwards. Finally, the new dryer is docked with the upper docking plate, and the opening and closing states of the exhaust and intake valves are readjusted to complete the replacement. This implementation method, by setting independent exhaust and intake pipes on each dryer and adjusting the exhaust and intake pipes, allows the unreplaced dryer to work independently during the replacement process. After replacement, the two dryers work together, thus avoiding interruption of the dehumidification function during replacement and preventing adverse effects on the transformer.

[0008] Preferably, the magnetic suction assembly includes a mounting groove formed on the docking plate, a magnet is fixed inside the mounting groove, and an insertion block is fixed on the surface of the drying tank. The insertion block is made of ferromagnetic material and is inserted into the mounting groove.

[0009] Specifically, during installation, the insert block on the surface of the drying tank is inserted into the mounting slot, allowing it to be attracted by a magnet, thus ensuring a stable connection between the drying tank and the docking plate. Furthermore, the drying tank can rise and fall synchronously with the docking plate as it rises and falls.

[0010] Preferably, the drying tank has two partitions fixed inside, each partition has a through hole on its surface, a support mesh is fixed inside the through hole, and a spiral blade is arranged between the two partitions.

[0011] Specifically, this invention involves setting up vertically spaced partitions inside the drying tank, installing spiral blades between the partitions and filling them with desiccant, and using a support net to prevent the desiccant from escaping the partition area. During gas intake, the gas enters through the through-hole at the bottom of the partition and exits through the through-hole at the top, spiraling upwards along the spiral channel formed by the spiral blades between the partitions. On the one hand, by extending the gas flow path, the contact area and time between the desiccant and the gas are increased, thereby effectively improving the drying efficiency. On the other hand, the gas penetrates upwards layer by layer along the spiral trajectory, ensuring that the desiccant changes color layer by layer according to the order of contact with the gas. This facilitates accurate judgment of the desiccant replacement time and avoids the overall waste caused by excessive desiccant failure in some areas.

[0012] Preferably, two vertical plates are fixed on the bottom surface of the drying tank, the top ends of the two vertical plates pass through the spiral blades and the partition and extend outwards, and multiple air vents are evenly opened on the surface of the vertical plates.

[0013] Preferably, the vertical plate has a sliding cavity inside, the bottom of which passes through the vertical plate and the drying tank. A sliding plate is slidably connected inside the sliding cavity. A first spring is fixed between the top surface of the sliding plate and the sliding cavity. A ventilation groove is formed on the surface of the sliding plate. A shrinkage-limiting hole is formed between adjacent ventilation grooves. A shrinkage-limiting tube is fixed inside the shrinkage-limiting hole. The spiral blades divide the vertical plate into multiple processing sections. The diameter of the shrinkage-limiting tube in each processing section is the same and increases along the height direction of the processing section. A protruding strip is fixed on the support plate and inserted inside the sliding cavity.

[0014] Preferably, the compression tube includes an inner tube and an outer tube, a support frame is fixed between the inner tube and the outer tube, an installation cavity is provided between the inner tube and the outer tube, a first sealing ring and a second sealing ring are provided in the installation cavity, the first sealing ring and the second sealing ring are respectively sealed at both ends of the installation cavity, a connecting rod is fixed between the first sealing ring and the second sealing ring, the connecting rod is slidably connected to the support frame, and an elastic support assembly is provided between the first sealing ring and the inner wall of the installation cavity.

[0015] Preferably, the elastic support assembly includes a moisture-absorbing block, one end of which is fixed to the first sealing ring, and the other end of which is fixed to the mounting cavity with a second spring.

[0016] Preferably, the mounting cavity includes an expansion cavity and two sealing cavities, with the two sealing cavities disposed on both sides of the expansion cavity, and the inner diameter of the sealing cavity being smaller than the inner diameter of the expansion cavity.

[0017] Preferably, each of the two sealing cavities has a guide groove on its sidewall, and the guide groove communicates with the interior of the expansion cavity.

[0018] Preferably, an oil seal can is fixed to the bottom of the support plate, a baffle is fixed inside the oil seal can, an air inlet is opened on the surface of the oil seal can, a breathable mesh plate is fixed to the bottom of the baffle, the oil seal can is filled with oil, the top surface of the oil submerges the breathable mesh plate, and the elastic pipe of the air inlet valve is connected to the inside of the oil seal can.

[0019] Compared with the prior art, the present invention has the following beneficial effects: 1. In this invention, each drying canister is filled with the same amount of desiccant as conventional desiccant, thereby ensuring that the upper drying canister still has reliable dehumidification performance during the replacement of the lower drying canister. This ensures that the lower drying canister can be replaced only after it is fully saturated, avoiding waste of desiccant.

[0020] 2. Once the lower drying tank is fully saturated, first close the air inlet valve of the lower drying tank, and simultaneously open the air inlet valve of the upper drying tank. This allows the gas to pass through only the upper drying tank, enabling separate dehumidification of the upper drying tank. This avoids interruption of the dehumidification function during replacement, which would necessitate closing the vent or other openings. It helps ensure the normal breathing function of the transformer and reduces the adverse effects of closing the vent.

[0021] Third, this invention sets up upper and lower partitions in the drying tank, installs spiral blades between the two partitions and fills them with desiccant, and uses a support net to prevent the desiccant from leaving the partition area. When the gas is introduced, it enters through the through hole at the bottom of the partition and exits through the through hole at the top, and flows spirally upward along the spiral channel formed by the spiral blades between the partitions. On the one hand, by extending the gas flow path, the contact area and time between the desiccant and the gas are increased, thereby effectively improving the drying efficiency. On the other hand, the gas penetrates upward layer by layer along the spiral trajectory, ensuring that the desiccant changes color layer by layer according to the order of contact with the gas. This makes it easy to accurately determine the time to replace the desiccant and avoids the problem of overall waste caused by excessive failure of local desiccant. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 for Figure 1 A magnified view of a section at point A in the middle; Figure 3This is a schematic diagram of the slide rail and support plate in one embodiment of the present invention; Figure 4 This is a schematic cross-sectional view of a drying tank according to one embodiment of the present invention. Figure 1 ; Figure 5 This is a schematic cross-sectional view of a drying tank according to one embodiment of the present invention. Figure 2 ; Figure 6 This is a cross-sectional structural diagram of the air guide tank and slide rail in one embodiment of the present invention; Figure 7 This is a schematic cross-sectional view of the vertical plate in one embodiment of the present invention; Figure 8 This is a schematic cross-sectional view of the compression tube in one embodiment of the present invention; Figure 9 This is a schematic cross-sectional view of an embodiment of the present invention; Figure 10 for Figure 9 A magnified view of a section at point B in the middle; In the diagram: 1. Transformer body; 2. Oil conservator; 3. Breathing pipe; 4. Air duct; 5. Exhaust valve; 6. Slide rail; 7. Support plate; 8. Connecting plate; 9. Outlet valve; 10. Inlet valve; 11. Drying tank; 12. Connecting hole; 13. Connecting slot; 14. Mounting slot; 15. Magnet; 16. Insertion block; 17. Partition plate; 18. Through hole; 19. Support mesh; 20. Spiral blade; 21. Vertical plate; 22. Vent hole; 23. Sliding cavity; 24. Sliding plate 25. First spring; 26. Ventilation groove; 27. Contraction hole; 28. Contraction tube; 29. ​​Raised strip; 30. Inner tube; 31. Outer tube; 32. Support frame; 33. Mounting cavity; 34. First sealing ring; 35. Second sealing ring; 36. Connecting rod; 37. Moisture-absorbing block; 38. Second spring; 39. Expansion cavity; 40. Sealing cavity; 41. Guide groove; 42. Oil seal can; 43. Baffle; 44. Air inlet; 45. Ventilation mesh plate; 46. Regulating valve. Detailed Implementation

[0023] The following description is intended to disclose the invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0024] like Figures 1 to 10 The low-noise oil-immersed transformer shown includes a transformer body 1, an oil conservator 2 fixedly connected to the top surface of the transformer body 1, a breathing pipe 3 fixedly connected to the bottom of the oil conservator 2, and further includes: The top of the air delivery canister 4 is fixedly connected to the breathing tube 3, and an exhaust valve 5 is provided on the surface of the air delivery canister 4. The slide rail 6 is fixed to the bottom of the air guide tank 4, and a support plate 7 is fixed to the bottom of the slide rail 6. Two docking plates 8 are vertically slidably connected to the slide rail 6. From top to bottom, the surfaces of the two docking plates 8 are fixed with an air outlet valve 9 and an air inlet valve 10. The air inlet valve 10 is connected to the space below the slide rail 6 through an elastic pipe, and the air outlet valve 9 is connected to the air guide tank 4 through an elastic pipe. Two drying tanks 11 are stacked on the support plate 7. The drying tanks 11 are magnetically connected to the docking plate 8 by a magnetic attraction assembly. Two docking holes 12 are opened on the side wall of the drying tank 11. The docking holes 12 are connected to the air inlet valve 10 and the air outlet valve 9 respectively. The top and bottom surfaces of the drying tanks 11 are provided with connecting grooves 13. The bottom connecting groove 13 of the upper drying tank 11 is connected to the top connecting groove 13 of the lower drying tank 11.

[0025] Specifically, under normal conditions, the air inlet valve 10 of the lower drying tank 11 is in the open state and the air outlet valve 9 is in the closed state, while the air inlet valve 10 of the upper drying tank 11 is in the closed state and the air outlet valve 9 is in the open state. A regulating valve 46 is provided in the connecting groove 13 at the top of the drying tank 11. When the two drying tanks 11 are connected, the regulating valve 46 at the bottom is opened and rotated, so that the upper and lower drying tanks 11 are connected to each other through the connecting groove 13. A sealing gasket is fixed at the bottom of the drying tank 11 to ensure the sealing between the two drying tanks 11. When the oil reservoir 2 inhales, the gas enters the lower drying tank 11 through the elastic pipe and the inlet valve 10. The gas is dried by the color-changing desiccant in the lower drying tank 11. The gas moves upward along the lower drying tank 11 and passes through the connecting groove 13 before entering the upper drying tank 11. Finally, it is discharged from the outlet valve 9 of the upper drying tank 11 into the air guide tank 4 and then into the breathing pipe 3. It then enters the oil reservoir 2 from the breathing pipe 3 to complete the inhalation function. When the oil reservoir 2 exhales, the gas is discharged through the breathing pipe 3 into the air guide tank 4 and directly discharged from the exhaust valve 5. The discharged gas does not pass through the desiccant, which helps to avoid oil mist in the gas from contaminating the desiccant. It should be noted that each drying canister 11 in this invention is filled with the same amount of conventional desiccant, thereby ensuring that the upper drying canister 11 still has reliable dehumidification performance during the replacement of the lower drying canister 11, thus ensuring that the lower drying canister 11 can be replaced only after it is completely saturated, avoiding waste of desiccant. The specific replacement method is as follows: when the lower drying tank 11 is fully saturated, first close the air inlet valve 10 of the lower drying tank 11, and at the same time open the air inlet valve 10 of the upper drying tank 11, so that the gas only passes through the upper drying tank 11 to achieve independent dehumidification of the upper drying tank 11. This avoids the interruption of the dehumidification function during the replacement process, which would cause the need to close the vent or other openings. This helps to ensure the normal breathing function of the transformer and reduces the adverse effects of closing the vent. Because the drying tank 11 is magnetically connected to the docking plate 8, the lower drying tank 11 can be manually removed directly to detach it from the docking plate 8. Then, the upper drying tank 11 is moved downwards, and the lower docking plate 8 is moved upwards. Finally, the new drying tank 11 is docked with the upper docking plate 8, and the opening and closing states of the exhaust valve 9 and the intake valve 10 are readjusted to complete the replacement work. This embodiment, by setting independent exhaust and intake pipes on each drying tank 11 and adjusting the exhaust and intake pipes, allows the unreplaced drying tank 11 to work independently during the replacement process. After the replacement is completed, the two drying tanks 11 work together, thereby avoiding interruption of the dehumidification function during replacement and preventing adverse effects on the transformer. It should be noted that the sliding method between the docking plate 8 and the slide rail 6 can be a damped sliding method, which can ensure the stability of the upper drying tank 11 when it slides down, and also prevent the docking plate 8 from automatically sliding down when the lower docking plate 8 is moved up, thus affecting the installation speed. A sealing ring can be fixed on the outside of the docking hole 12. Under the magnetic attraction, the docking hole 12 can be sealed with the docking position of the exhaust valve 9 and the intake valve 10. Other docking structures can also be installed on the docking hole 12 to seal with the exhaust valve 9 and the intake valve 10. This is existing technology and will not be described in detail here.

[0026] As a further embodiment of the present invention, the magnetic suction assembly includes a mounting groove 14, which is formed on the docking plate 8. A magnet 15 is fixed inside the mounting groove 14, and an insertion block 16 is fixed on the surface of the drying tank 11. The insertion block 16 is made of ferromagnetic material and is inserted into the mounting groove 14.

[0027] Specifically, during installation, the insertion block 16 on the surface of the drying tank 11 is inserted into the mounting groove 14 and attracted by the magnet 15, thereby making the drying tank 11 stably connected with the docking plate 8, and the drying tank 11 can rise and fall synchronously when the docking plate 8 rises and falls.

[0028] As a further embodiment of the present invention, the drying tank 11 has two partitions 17 fixed inside, and each of the two partitions 17 has a through hole 18 on its surface. A support mesh 19 is fixed inside the through hole 18, and a spiral blade 20 is arranged between the two partitions 17.

[0029] Specifically, when using color-changing desiccants, the replacement time needs to be determined by the degree of color change layer by layer. However, since the air inlet of the drying tank 11 is located on the side and the gas tends to be adsorbed upwards, the desiccant far from the air inlet may experience uneven color change due to insufficient gas contact, resulting in some desiccant being wasted. This invention can solve the above problems. The specific working method is as follows: This invention sets up vertically spaced partitions 17 inside the drying tank 11, installs spiral blades 20 between the two partitions 17 and fills them with desiccant, and at the same time uses a support net 19 to prevent the drying process from drying out. The desiccant leaves the partition 17 area. When the gas is introduced, it enters through the through hole 18 at the bottom of the partition 17 and exits through the through hole 18 at the top. It then spirals upward between the partitions 17 along the spiral channel formed by the spiral blades 20. On the one hand, by extending the gas flow path, the contact area and time between the desiccant and the gas are increased, thereby effectively improving the drying efficiency. On the other hand, the gas penetrates upward layer by layer along the spiral trajectory, ensuring that the desiccant changes color layer by layer according to the order of contact with the gas. This makes it easy to accurately determine the time to replace the desiccant and avoids the overall waste caused by excessive failure of local desiccant.

[0030] As a further embodiment of the present invention, two vertical plates 21 are fixed on the bottom surface of the drying tank 11. The top ends of the two vertical plates 21 pass through the spiral blades 20 and the partition 17 and extend outward. A plurality of air vents 22 are evenly opened on the surface of the vertical plates 21.

[0031] Specifically, when using color-changing desiccant, the replacement time needs to be determined by the color change of each layer. Therefore, the stability of the desiccant is crucial. During the replacement process, for example, when the upper drying tank 11 descends, the desiccant may vibrate, causing vertical displacement of each layer of desiccant, which in turn affects the accuracy of the color change judgment. This invention can solve the above problems. The specific working method is as follows: by setting a vertical plate 21 through the spiral blade 20 in the vertical direction, the spiral channel formed by the spiral blade 20 is divided into multiple independent partition spaces. Under the physical barrier of the vertical plate 21, the desiccant in each partition space can only move within its own closed area even if affected by external vibration, thereby greatly reducing the situation of vertical displacement of desiccant across layers and avoiding color change judgment errors caused by large-scale position changes. In addition, in order to ensure the airflow efficiency of the drying system, multiple vent holes 22 are evenly opened on the surface of the vertical plate 21 to ensure that the drying airflow passes smoothly through the partition area.

[0032] As a further embodiment of the present invention, a sliding cavity 23 is provided inside the vertical plate 21. The bottom of the sliding cavity 23 passes through the vertical plate 21 and the drying tank 11. A sliding plate 24 is slidably connected inside the sliding cavity 23. A first spring 25 is fixed between the top surface of the sliding plate 24 and the sliding cavity 23. A ventilation groove 26 is provided on the surface of the sliding plate 24. A shrinkage hole 27 is provided between adjacent ventilation grooves 26. A shrinkage tube 28 is fixed inside the shrinkage hole 27. The spiral blade 20 divides the vertical plate 21 into multiple processing sections. The diameter of the shrinkage tube 28 in each processing section is the same and the diameter increases along the height direction of the processing section. A protruding strip 29 is fixed on the support plate 7 and is inserted inside the sliding cavity 23.

[0033] Specifically, when the adsorption force is large, the airflow rises rapidly along the spiral channel, which may make it difficult to make uniform contact with the desiccant in each partitioned area. To improve uniformity, this invention provides a sliding plate 24 in the sliding cavity 23, with a limiting hole 27 and a limiting tube 28 on the sliding plate 24, so that the limiting hole 27 is connected to the vent hole 22. Since the spiral blades 20 divide the vertical plate 21 into multiple processing sections of different heights, partitioned areas are naturally formed between adjacent processing sections. When the airflow moves in the spiral channel, it will pass through each different processing section in sequence. The diameter of the limiting tube 28 on the processing section increases in sequence, thereby creating a throttling effect in each partitioned area. Through this throttling effect, the residence time of the gas in each partitioned area is increased, thus creating favorable conditions for sufficient contact between the gas and the desiccant, ensuring that the gas can make uniform contact with the desiccant in each partitioned area, effectively improving the drying efficiency and effect. As for the upper drying tank 11, since the amount of humid gas entering it is relatively small, a throttling effect is not required; only normal gas passage is necessary. Under normal operating conditions, the bottom surface of the sliding plate 24 remains flush with the bottom surface of the drying tank 11 under the elastic force of the first spring 25. At this time, the vent 22 and the vent groove 26 are connected. This connection ensures that the airflow passes evenly through the upper drying tank 11, satisfying the gas passage requirements without creating unnecessary airflow obstruction, thus ensuring the smooth operation of the entire drying system. Looking at the lower drying tank 11, its working principle is different from that of the upper one. Since the protruding strip 29 on the support plate 7 is inserted into the sliding cavity 23, the protruding strip 29 will push the sliding cylinder upward. During this process, the first spring 25 is compressed. As the sliding cylinder moves upward, the venting groove 26 and the venting hole 22 gradually lose communication, while the limiting hole communicates with the venting hole 22. The limiting ring in the limiting hole can effectively limit the hole diameter. Combined with the design of the upper limit shrink tube 28 of each processing section with the hole diameter increasing sequentially, the function of forming a throttling effect in each separated area is successfully realized. This design is conducive to ensuring that the gas and desiccant in the lower drying tank 11 can fully and evenly contact each other. Even under complex working conditions such as large adsorption force, the stability and efficiency of the drying process can be ensured.

[0034] As a further embodiment of the present invention, the compression tube 28 includes an inner tube 30 and an outer tube 31. A support frame 32 is fixed between the inner tube 30 and the outer tube 31. An installation cavity 33 is provided between the inner tube 30 and the outer tube 31. A first sealing ring 34 and a second sealing ring 35 are provided in the installation cavity 33. The first sealing ring 34 and the second sealing ring 35 are respectively provided to seal both ends of the installation cavity 33. A connecting rod 36 is fixed between the first sealing ring 34 and the second sealing ring 35. The connecting rod 36 is slidably connected to the support frame 32. An elastic support assembly is provided between the first sealing ring 34 and the inner wall of the installation cavity 33.

[0035] Specifically, when the lower desiccant becomes saturated with moisture, it may break under the scouring action of airflow. The resulting dust, as it flows with the airflow in the spiral channel, can easily clog the flow hole 18 in the middle of the limiting ring. To solve this problem, this embodiment improves the structure of the limiting ring by opening an annular mounting cavity 33 inside the limiting ring body, and setting a first sealing ring 34 and a second sealing ring 35 on the upstream and downstream sides of the mounting cavity 33, respectively. The sealing ring is dynamically positioned by an elastic support component. Under normal operating conditions, the elastic support assembly provides initial preload, causing the first sealing ring 34 and the second sealing ring 35 to fit against the end face of the mounting cavity 33, forming a reliable seal and effectively preventing dust from entering the mounting cavity 33. At this time, the airflow only flows stably through the main flow hole 18 in the middle of the limiting ring, meeting the normal ventilation requirements of the system. When dust gradually accumulates and causes blockage in the main through-hole 18, a pressure difference is created between the upstream and downstream sides of the hole. As the pressure difference increases to exceed the preload of the elastic support component, the airflow pressure pushes the first sealing ring 34 and the second sealing ring 35 to simultaneously compress the elastic component, causing the sealing rings to disengage from the blocked state at the end face of the mounting cavity 33 and opening the upstream and downstream channels of the mounting cavity 33. At this time, the airflow can continue to flow through the parallel flow channel formed by the mounting cavity 33 and the main through-hole, thereby effectively alleviating the blockage problem and ensuring the continuous operation of the system.

[0036] As a further embodiment of the present invention, the elastic support assembly includes a moisture-absorbing block 37, one end of which is fixed to a first sealing ring 34, and a second spring 38 is fixed between the other end of the moisture-absorbing block 37 and the mounting cavity 33.

[0037] Specifically, during the transformer's air exhalation process, the air pressure is difficult to maintain and needs to be continuously overcome by the elastic force of the second spring 38, which may lead to intermittent airflow. This invention can solve the above problems. The specific working method is as follows: In the initial state, the second spring 38 is in its original length state. By setting a moisture-absorbing block 37 between the second spring 38 and the first sealing ring 34, the moisture-absorbing block 37 becomes soft or broken after absorbing moisture, providing a clearance distance for the movement of the first sealing ring 34. Within the clearance distance, the first sealing ring 34 does not need to overcome the elastic force of the second spring 38, thereby ensuring that the mounting cavity 33 can maintain a stable open state and ensuring the stability of airflow. It should be noted that the moisture-absorbing block 37 can be made of desiccant materials, such as quicklime, which crumbles after absorbing moisture to provide clearance. The moisture-absorbing block 37 can also be made of other reusable hydrophilic materials that soften after absorbing moisture to provide clearance and return to a rigid state after drying.

[0038] As a further embodiment of the present invention, the mounting cavity 33 includes an expansion cavity 39 and two sealing cavities 40, the two sealing cavities 40 being disposed on both sides of the expansion cavity 39, and the inner diameter of the sealing cavity 40 being smaller than the inner diameter of the expansion cavity 39.

[0039] Specifically, since the inner diameter of the sealing cavity 40 is smaller than the inner diameter of the expansion cavity 39, after the first sealing ring 34 leaves the sealing cavity 40 and enters the expansion cavity 39, there is a large gap between the first sealing ring 34 and the inner wall of the expansion cavity 39, which can ensure the passage of air. Furthermore, due to the unstable air pressure, under the action of air pressure and the elastic force of the spring, the first sealing ring 34 will move a short distance in the expansion cavity 39, producing a shaking effect, which can further prevent dust from clogging the expansion cavity 39.

[0040] As a further embodiment of the present invention, each of the two sealing cavities 40 has a guide groove 41 on its sidewall, and the guide groove 41 communicates with the interior of the expansion cavity 39.

[0041] Specifically, in the above embodiments, the moisture-absorbing block 37 absorbs moisture and breaks apart to provide clearance distance to ensure the stability of airflow. However, when the gas initially enters the expansion cavity 39, due to the small initial air intake, the moisture-absorbing block 37 is difficult to quickly absorb moisture and break apart to provide clearance distance. To address this, the present invention provides a guide groove 41 on the side wall of the sealing cavity 40, so that the first sealing ring 34 only needs to move a small distance to achieve communication between the expansion cavity 39 and the outside. This design helps to ensure that the airflow enters the expansion cavity 39 stably, while also prompting the moisture-absorbing block 37 to break apart quickly and provide clearance distance.

[0042] As a further embodiment of the present invention, an oil seal can 42 is fixed at the bottom of the support plate 7, a baffle 43 is fixed inside the oil seal can 42, an air inlet 44 is opened on the surface of the oil seal can 42, a breathable mesh plate 45 is fixed at the bottom of the baffle 43, the oil seal can 42 is filled with oil, the top surface of the oil submerges the breathable mesh plate 45, and the elastic pipe of the air inlet valve 10 is connected to the inside of the oil seal can 42.

[0043] Specifically, external gas enters through the air inlet 44 and, blocked by the baffle 43, passes through the oil and enters the elastic pipe of the air inlet valve 10. The oil barrier prevents dust and other impurities in the external gas from entering, which helps to ensure the cleanliness of the incoming gas.

[0044] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A low-noise oil-immersed transformer, comprising a transformer body, wherein an oil conservator is fixedly connected to the top surface of the transformer body, and a breathing pipe is fixedly connected to the bottom of the oil conservator, characterized in that, Also includes: An air delivery canister, the top of which is fixedly connected to the breathing tube, and an exhaust valve is provided on the surface of the air delivery canister; A slide rail is fixed to the bottom of the air delivery tank, and a support plate is fixed to the bottom of the slide rail; Two docking plates are vertically slidably connected to the slide rail. An air outlet valve and an air inlet valve are fixed sequentially on the surface of the two docking plates from top to bottom. The air inlet valve is connected to the space below the slide rail through an elastic pipe, and the air outlet valve is connected to the air guide tank through an elastic pipe. Two drying tanks are stacked one on top of the other on the support plate. The two drying tanks are magnetically connected to the two docking plates by magnetic assemblies. Two docking holes are opened on the side wall of each drying tank, and the two docking holes are respectively connected to the air inlet valve and the air outlet valve. The top and bottom surfaces of each drying tank are provided with connecting grooves, and the connecting groove at the bottom of the upper drying tank is connected to the connecting groove at the top of the lower drying tank. The drying tank has two fixed partitions inside, and each partition has a through hole on its surface. A support mesh is fixed inside the through hole, and a spiral blade is arranged between the two partitions and filled with desiccant. Two vertical plates are fixed on the bottom surface of the drying tank. The top ends of the two vertical plates pass through the spiral blades and the partition and extend outward. Multiple air vents are evenly opened on the surface of the vertical plates. The vertical plate has a sliding cavity inside, the bottom of which passes through the vertical plate and the drying tank. A sliding plate is slidably connected inside the sliding cavity. A first spring is fixed between the top surface of the sliding plate and the sliding cavity. A ventilation groove is formed on the surface of the sliding plate. A shrinkage limiting hole is formed between adjacent ventilation grooves. A shrinkage limiting tube is fixed inside the shrinkage limiting hole. The spiral blades divide the vertical plate into multiple processing sections. The diameter of the shrinkage limiting tube in each processing section is the same and increases upward along the height direction of the vertical plate. The diameter of the tube in different processing sections increases progressively. A protruding strip is fixed on the support plate and is inserted inside the sliding cavity.

2. The low-noise oil-immersed transformer according to claim 1, characterized in that: The magnetic suction assembly includes a mounting groove, which is formed on the docking plate. A magnet is fixed inside the mounting groove. An insertion block is fixed on the surface of the drying tank. The insertion block is made of ferromagnetic material and is inserted into the mounting groove.

3. The low-noise oil-immersed transformer according to claim 1, characterized in that: The compression tube includes an inner tube and an outer tube. A support frame is fixed between the inner tube and the outer tube. An installation cavity is provided between the inner tube and the outer tube. A first sealing ring and a second sealing ring are provided in the installation cavity. The first sealing ring and the second sealing ring are respectively sealed at both ends of the installation cavity. A connecting rod is fixed between the first sealing ring and the second sealing ring. The connecting rod is slidably connected to the support frame. An elastic support assembly is provided between the first sealing ring and the inner wall of the installation cavity.

4. The low-noise oil-immersed transformer according to claim 3, characterized in that: The elastic support assembly includes a moisture-absorbing block, one end of which is fixed to the first sealing ring, and the other end of which is fixed to the mounting cavity with a second spring.

5. The low-noise oil-immersed transformer according to claim 4, characterized in that: The mounting cavity includes an expansion cavity and two sealing cavities. The two sealing cavities are located on both sides of the expansion cavity, and the inner diameter of the sealing cavity is smaller than the inner diameter of the expansion cavity.

6. The low-noise oil-immersed transformer according to claim 5, characterized in that: Both of the sealing cavities have flow guide grooves on their side walls, and the flow guide grooves are connected to the interior of the expansion cavity.

7. The low-noise oil-immersed transformer according to claim 1, characterized in that: An oil seal can is fixed to the bottom of the support plate. A baffle is fixed inside the oil seal can. An air inlet is opened on the surface of the oil seal can. A breathable mesh plate is fixed to the bottom of the baffle. The oil seal can is filled with oil. The top surface of the oil submerges the breathable mesh plate. The elastic pipe of the air inlet valve is connected to the inside of the oil seal can.

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