Oil-immersed transformer convenient for replacing insulating oil

Abstract

The invention discloses an oil-immersed transformer convenient to replace insulating oil, and relates to the technical field of oil-immersed transformers, the oil-immersed transformer comprises a transformer main body, cooling fins are arranged on the peripheral surface of the transformer main body, an oil conservator is fixedly connected to one side of the upper surface of the transformer main body, and an air bag is arranged in the oil conservator; the end, extending out of the conservator through the second guide pipe, of the air bag communicates with a respirator. When water absorption particles in one drying cavity absorb water to be saturated or agglomerate and the like, the water absorption box rotates in the connecting shell, the next drying cavity communicates with the second guide pipe, the second connecting pipe, the air bag and the external environment, the working time of the respirator can be prolonged through the arrangement of the multiple drying cavities, and the service life of the respirator is prolonged. And when air holes of one drying cavity are blocked, the next standby drying cavity still exists, and it is guaranteed that adjustment of the height of the oil level in the oil tank is not affected.

Description

Technical Field

[0001] This invention relates to the field of oil-immersed transformer technology, and more specifically to an oil-immersed transformer that facilitates the replacement of insulating oil. Background Technology

[0002] An oil-immersed transformer is a power transformer that uses insulating oil as the main insulating and cooling medium. Its windings and core are completely immersed in the insulating oil, and it is one of the most widely used transformer types in power systems.

[0003] The main structure of an oil-immersed transformer includes the core, windings, insulating oil, and oil tank. The auxiliary system includes the radiator, oil conservator, tap changer, gas relay, thermometer, and pressure relief valve. The function of the oil conservator is to balance the oil volume change caused by oil temperature changes, reduce the contact between oil and air, and delay oil deterioration. Currently, air bladders are often installed in the oil conservator to automatically adjust the flow of insulating oil from the oil conservator to the oil tank or from the oil tank to the oil conservator according to the rise and fall of the insulating oil temperature.

[0004] The airbag is connected to a pipe that connects it to the external environment, and a respirator is connected to the air inlet of the pipe. The respirator contains color-changing silica gel to absorb moisture from the gas. After absorbing water, the silica gel expands slightly, the particle diameter increases slightly, and the color changes from blue when dry to pink. If the ambient humidity is high, the air contains a lot of water, or the pressure inside the oil tank changes significantly, causing outside air to rapidly enter the airbag, a thin water film will form on the surface of the silica gel particles after absorbing water, causing the particles to stick together and form irregular lumps. In particular, since the color-changing silica gel is usually placed in a cylindrical container, and the gas flows from low to high in the respirator, the silica gel particles at the bottom will become saturated with water first. If the temperature is low, the saturated silica gel particles at the bottom will freeze and stick together, blocking the pores. At this time, the absorbent material at the higher level may not have become saturated with water, and the color of the silica gel may not have changed much. This situation not only affects the judgment of the water saturation of the color-changing silica gel in the respirator, but also affects the adjustment of the oil level inside the oil tank. Therefore, this application proposes an oil-immersed transformer that facilitates the replacement of insulating oil, in order to solve the above-mentioned problems. Summary of the Invention

[0005] This invention provides an oil-immersed transformer that facilitates the replacement of insulating oil, thereby solving the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: An oil-immersed transformer that facilitates the replacement of insulating oil includes a transformer body, a heat sink provided on the outer peripheral surface of the transformer body, an oil conservator fixedly connected to one side of the upper surface of the transformer body, an air bladder provided inside the oil conservator, and a breather connected to one end of the air bladder extending to the outside of the oil conservator through a conduit.

[0007] The respirator includes a connecting tube two connected to the tubing two. The bottom of the connecting tube two is fixedly connected to a connecting shell. A water-absorbing box is movably connected inside the connecting shell. The inside of the water-absorbing box is divided into multiple drying chambers by multiple partitions. Each drying chamber is filled with water-absorbing particles.

[0008] In the initial stage, the airbag, the second conduit, and the second connecting tube are connected to the external environment through one of the drying chambers by the connecting shell. When the water-absorbing particles in one drying chamber are saturated with water, the water-absorbing box rotates in the connecting shell, so that the next drying chamber is connected to the airbag and the external environment.

[0009] A further improvement of the technical solution of the present invention is that: each drying chamber has through air holes at the top and bottom.

[0010] The connecting shell includes a top cover that is fixedly connected to the bottom of the connecting tube 2. The top cover has a top air hole 1 located inside the connecting tube 2. The top of the water absorption box is movably connected to the inner wall of the top cover.

[0011] It also includes a bottom sleeve that is detachably connected to the top cover, the bottom of the water absorption box is movably connected to the inner wall of the bottom sleeve, and a bottom air hole is provided on the bottom sleeve.

[0012] In the initial stage, two through-holes on one of the drying chambers are connected to the top pore one and the bottom pore one, respectively. After the water-absorbing particles in one of the drying chambers are saturated with water, the water-absorbing box rotates, so that the two through-holes of the next drying chamber are connected to the top pore one and the bottom pore one.

[0013] The top of the inner cavity of the top cover and the bottom of the inner cavity of the bottom sleeve respectively block multiple through vents on other drying chambers.

[0014] A further improvement of the technical solution of the present invention is that: a rotating shaft is fixedly connected on the central axis of the water absorption box, and the two ends of the rotating shaft are movably connected to the top cover and the bottom cover respectively. A gear is fixedly connected to one end of the rotating shaft extending to the outside of the top cover, and a driving device for driving the rotating shaft and the water absorption box to rotate together is fixedly connected to the top cover.

[0015] A further improvement of the technical solution of the present invention is that a detection element is fixedly connected to the inner wall of the connecting pipe II by a fixing bracket II.

[0016] A further improvement of the technical solution of the present invention is that: a connecting sleeve is fixedly connected to the lower surface of the bottom sleeve, a plurality of communicating air holes are opened on the outer peripheral surface of the top end of the connecting sleeve, an oil box is movably connected to the bottom end of the connecting sleeve, and a conduit five is fixedly connected to the bottom of the bottom sleeve, the conduit five covering the bottom air hole one.

[0017] After the oil box is connected to the connecting sleeve, the lower surface of the fifth conduit does not contact the bottom of the inner cavity of the oil box. The oil box contains insulating oil, and the upper surface of the insulating oil covers the lower surface of the fifth conduit.

[0018] A further improvement of the technical solution of the present invention is that: a top air hole 2 is provided on the top cover, a bottom air hole 2 is provided on the bottom sleeve, and a conduit 6 is connected to the upper surface of the top cover at the top air hole 2, and a hot air assembly is connected to the inner wall of the conduit 6.

[0019] When the water-absorbing particles in one of the drying chambers become saturated with water, and the water-absorbing box rotates, the two through vents of the drying chamber are connected to the top vent and the bottom vent, respectively.

[0020] A further improvement of the technical solution of the present invention is that: a detection element 2 is fixedly connected to the inner wall of the bottom air hole 2 by a fixing bracket 3, and a valve is movably connected to the inner wall of the bottom air hole 2.

[0021] A further improvement of the technical solution of the present invention is that: the hot air assembly includes a fan movably connected by a fixed frame four, and a heating device is fixedly connected to the inner wall of the bottom of the fan six.

[0022] A further improvement of the technical solution of the present invention is that: the airbag includes an elastic bladder and a collecting conduit, the inner walls of the elastic bladder and the collecting conduit are coated with a hydrophobic material, the collecting conduit is fixedly connected to the bottom of the elastic bladder, one end of the collecting conduit is fixedly connected to a liquid collection box, and the collecting conduit and the liquid collection box are inclined toward the liquid collection box.

[0023] A further improvement of the technical solution of the present invention is that: a liquid level sensor is fixedly connected to the inner wall of the liquid collection box, and an outlet component is provided inside the liquid collection box.

[0024] Due to the adoption of the above technical solution, the technical progress achieved by this invention compared to the prior art is as follows: 1. This invention provides an oil-immersed transformer that facilitates the replacement of insulating oil. When the water-absorbing particles in one of the drying chambers become saturated or clump together, the water-absorbing box rotates in the connecting shell, allowing the next drying chamber to connect with the second conduit, the second connecting pipe, the air bladder, and the external environment. The arrangement of multiple drying chambers not only extends the working time of the breather but also ensures that if the air vents in one drying chamber become blocked, there is still a backup next drying chamber, guaranteeing that the adjustment of the oil level inside the tank is not affected.

[0025] 2. This invention provides an oil-immersed transformer that facilitates the replacement of insulating oil. When the water-absorbing particles in one of the drying chambers become saturated with water, the water-absorbing box rotates. The water-saturated particles, or some of them, become clump together due to low temperature, blocking the air vents. The drying chamber is rotated so that the through-holes connect with the top air vent and the bottom air vent. At this time, the hot air assembly works, generating high-temperature hot air that flows into the drying chamber. The high-temperature hot air dries the water-saturated particles. After a period of time, the water-saturated particles can be restored to their blue color and reused, further extending the service life of the breather. It also allows for the recycling and reuse of the water-saturated silica gel, saving energy.

[0026] 3. This invention provides an oil-immersed transformer that facilitates the replacement of insulating oil. By coating the inner walls of the elastic bladder and the collecting conduit with a hydrophobic material, condensed water droplets gradually fall down the inner walls of the elastic bladder and the collecting conduit and converge into the collecting conduit. Due to the inclined design of the collecting conduit, the droplets that converge into the collecting conduit will fall into the liquid collection box. When the liquid level sensor in the liquid collection box detects the presence of liquid, the liquid pump starts, drawing the liquid in the liquid collection box through conduit one to conduit three, and then through conduit four to the gas external casing for temporary storage. Through the above technical solution, not only can the possibility of moisture condensing inside the elastic bladder be further reduced, but the condensed water can also be discharged in time, preventing condensed water from accumulating inside the elastic bladder and seeping into the insulating oil outside the bladder through tiny damage points, causing the oil to become damp, the dielectric strength to decrease, and potentially leading to winding insulation breakdown faults. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a structural schematic diagram of the present invention from another angle; Figure 3 This is a schematic diagram of the structure of the respirator of the present invention; Figure 4 This is a schematic diagram of the structure of the respirator oil box of the present invention; Figure 5 This is a schematic diagram of the water absorption box of the present invention; Figure 6 This is a schematic diagram of the structure of the first and second top air holes of the present invention; Figure 7 This is a schematic diagram of the bottom structure of the bottom sleeve of the present invention; Figure 8 This is a schematic diagram of the structure of the bottom sleeve of the present invention; Figure 9 This is a schematic cross-sectional view of the elastic bladder and oil cushion of the present invention along the axial direction. Figure 10This is a schematic diagram of the radial cross-sectional structure of the elastic bladder and oil cushion of the present invention; Figure 11 For the present invention Figure 2 A magnified structural diagram of point A in the middle.

[0028] In the diagram: 1. Transformer body; 2. Heat sink; 3. Oil conservator; 4. Elastic bladder; 5. Connecting pipe one; 6. Collecting conduit; 7. Liquid collection box; 8. Liquid level sensor; 9. Conduit one; 10. T-junction; 11. Conduit two; 12. Conduit three; 13. Liquid pump; 14. Conduit four; 15. Fixing bracket one; 16. Connecting pipe two; 17. Top cover; 18. Top vent one; 19. Top vent two; 20. Water absorption box; 21. Partition; 22. Through vent; 23. Water-absorbing particles; 24. 25. Bottom vent 1; 26. Bottom vent 2; 27. Connecting sleeve; 28. Connecting vent; 29. ​​Oil box; 30. Conduit 5; 31. Connecting rod; 32. Connecting bolt; 33. Rotating shaft; 34. Gear; 35. Drive device; 36. Fixing bracket 2; 37. Inspection piece 1; 38. Fixing bracket 3; 39. Inspection piece 2; 40. Conduit 6; 41. Air inlet ear plate; 42. Air inlet; 43. Protective cover; 44. Fixing bracket 4; 45. Fan; 46. Heating device. Detailed Implementation

[0029] The present invention will be further described in detail below with reference to embodiments: Example

[0030] like Figure 1-11 As shown, the present invention provides an oil-immersed transformer that facilitates the replacement of insulating oil, including a transformer body 1, which is a prior art technology and includes structures such as an iron core, windings, oil tank, gas relay, and pressure relief valve. A heat sink 2 is provided on the outer peripheral surface of the transformer body 1, which is a prior art technology, for heat dissipation treatment of the insulating oil in the transformer body 1. An oil conservator 3 is fixedly connected to one side of the upper surface of the transformer body 1. An air bladder is provided inside the oil conservator 3. The air bladder extends to one end of the oil conservator 3 through a conduit 11 and is connected to a breather. The air bladder is completely inside the oil conservator 3, and the oil conservator 3 is filled with insulating oil. An oil inlet pipe and an oil drain pipe are fixedly connected to one side of the transformer body 1, which facilitates the addition or removal of insulating oil in the transformer body 1.

[0031] It also includes a PLC control system and other related equipment, which are electrically connected to each of the electrical control devices in this application to ensure the real-time performance and accuracy of control commands and to meet the continuous operation requirements of each device in this application.

[0032] The respirator includes a connecting tube 16 connected to the tubing 11. A connecting shell is fixedly connected to the bottom of the connecting tube 16. An absorbent box 20 is movably connected inside the connecting shell. The absorbent box 20 can be made of transparent material to facilitate real-time observation of the color change of the absorbent particles 23 in the drying chamber and to determine whether the absorbent particles 23 need to be replaced based on the color change. The absorbent box 20 is divided into multiple drying chambers by multiple partitions 21. Each drying chamber is filled with absorbent particles 23. The absorbent particles 23 can be materials with strong water absorption, such as color-changing silica gel or activated alumina particles. When the color-changing silica gel absorbs water, its color changes from blue to pink. If the blue color gradually fades, it needs to be replaced. The absorbent material in this application is color-changing silica gel particles.

[0033] In the initial stage, the airbag, conduit 21, and connecting tube 216 are connected to the external environment through one of the drying chambers by the connecting shell. When the water-absorbing particles 23 in one drying chamber are saturated with water, the water-absorbing box 20 rotates in the connecting shell, so that the next drying chamber is connected to the airbag and the external environment.

[0034] When the temperature of the insulating oil in the transformer body 1 rises, the volume of the insulating oil expands, squeezing the air bladder and causing it to contract. The gas inside the air bladder is then discharged to the external environment through conduit 2 11, connecting pipe 2 16, and the breather.

[0035] When the temperature of the insulating oil in the transformer body 1 decreases, the volume of the insulating oil shrinks, and the air bladder expands under atmospheric pressure. After being dried by one of the drying chambers in the breather, the outside air is drawn into the air bladder through the connecting pipe 2 16 and the conduit 2 11 to replenish the air bladder volume and maintain the pressure balance between the oil conservator 3 and the oil tank of the transformer body 1.

[0036] When the absorbent particles 23 in one of the drying chambers become saturated with water or clump together, the absorbent box 20 rotates in the connecting shell, allowing the next drying chamber to connect with the second conduit 11, the second connecting tube 16, the air bag, and the external environment. The setup of multiple drying chambers not only extends the working time of the respirator but also ensures that if the air vents of one drying chamber become blocked, there is still a backup drying chamber, guaranteeing that the adjustment of the oil level inside the oil tank is not affected.

[0037] Furthermore, each drying chamber has through-holes 22 at the top and bottom, and mesh plates are fixedly connected to the inner wall of each through-hole 22 to ensure that the water-absorbing particles 23 in the drying chamber are always inside the drying chamber and that the water-absorbing particles 23 do not fall off.

[0038] The connecting shell includes a top cover 17 that is fixedly connected to the bottom of the connecting tube 2 16. The top cover 17 has a top air hole 18, which is located inside the connecting tube 2 16. The top of the water absorption box 20 is movably connected to the inner wall of the top cover 17.

[0039] It also includes a bottom sleeve 24 that is detachably connected to the top cover 17. The top cover 17 and the bottom sleeve 24 have multiple connecting holes on their outer peripheral surfaces. A connecting rod 31 is movably connected to the inner wall of the connecting hole. Threads are provided on the outer surfaces of both ends of the connecting rod 31. The diameter of the threaded part of the connecting rod 31 is the same as the diameter of the connecting hole, and the diameter of the unthreaded part of the connecting rod 31 is larger than the diameter of the connecting hole. Connecting bolts 32 are threaded to both ends of the connecting rod 31. The bottom of the water absorption box 20 is movably connected to the inner wall of the bottom sleeve 24. The bottom sleeve 24 has a bottom air hole 25.

[0040] In the initial stage, two through-holes 22 on one of the drying chambers are connected to the top vent 18 and the bottom vent 25 respectively. After the water-absorbing particles 23 in one of the drying chambers are saturated with water, the water-absorbing box 20 rotates, so that the two through-holes 22 of the next drying chamber are connected to the top vent 18 and the bottom vent 25 respectively.

[0041] The top of the inner cavity of the top cover 17 and the bottom of the inner cavity of the bottom sleeve 24 respectively block the multiple through vents 22 on other drying cavities.

[0042] After the water-absorbing box 20 is installed between the top cover 17 and the bottom sleeve 24, the through-hole 22 at the top of one of the drying chambers is aligned with the top air hole 18 on the top cover 17, and the through-hole 22 at the bottom is aligned with the bottom air hole 25 on the bottom sleeve 24. At this time, the air bag, the second conduit 11, the second connecting pipe 16, the top air hole 18, the drying chamber, and the bottom air hole 25 are connected. When the temperature of the insulating oil in the transformer body 1 decreases and the volume of the insulating oil shrinks, the external gas enters the drying chamber through the bottom air hole 25 and the through-hole 22 at the bottom of the drying chamber. The water-absorbing particles 23 dry the gas, and the treated gas passes through the top through-hole 22, the top air hole 18, and the second connecting pipe 16. 16. The second conduit 11 flows into the air bag, completing the automatic adjustment of the insulating oil level in the oil tank. At this time, the multiple through-holes 22 corresponding to the other drying chambers on the water absorption box 20 are blocked by the top of the inner cavity of the top cover 17 and the bottom of the inner cavity of the bottom sleeve 24, so that the gas only passes through one of the drying chambers. When the water-absorbing particles 23 in one of the drying chambers are saturated with water, or when they freeze or stick together due to low temperature, or other situations, the water absorption box 20 can be rotated to connect the other drying chamber with the top cover 17, the top air hole 18, and the bottom air hole 25, ensuring that the normal use of the breather is not affected and that the adjustment of the insulating oil level in the oil tank of the transformer body 1 is not affected.

[0043] Furthermore, a rotating shaft 33 is fixedly connected to the central axis of the absorbent box 20. The two ends of the rotating shaft 33 are movably connected to the top cover 17 and the bottom sleeve 24, respectively. A gear 34 is fixedly connected to one end of the rotating shaft 33 extending to the outside of the top cover 17. A drive device 35 is fixedly connected to the top cover 17 to drive the rotating shaft 33 and the absorbent box 20 to rotate together. The drive device 35 is existing technology and includes a motor, a drive wheel, a transmission chain, and other related accessories. The drive device 35 can drive the rotating shaft 33 to rotate the absorbent box 20 along the top cover 17 and the bottom sleeve 24, so that the drying chambers at different positions are aligned with the top air hole 18 and the bottom air hole 25, ensuring that the normal use of the respirator is not affected. The angle at which the drive device 35 drives the absorbent box 20 to rotate each time is the same as the angle between the two adjacent top air holes 18.

[0044] Furthermore, a detection element 37 is fixedly connected to the inner wall of the connecting pipe 2 16 via a fixing bracket 2 36. The detection element 37 is existing technology and integrates an integrated anemometer and humidity sensor. Both the integrated anemometer and humidity sensor are existing technologies and are miniature devices to adapt to the installation environment in this application. The airflow in the connecting pipe 2 16 can be monitored in real time through the detection element 37.

[0045] Furthermore, a connecting sleeve 27 is fixedly connected to the lower surface of the bottom sleeve 24. Multiple connecting vent holes 28 are opened on the outer peripheral surface of the top end of the connecting sleeve 27. An oil box 29 is movably connected to the bottom end of the connecting sleeve 27. A conduit 30 is fixedly connected to the bottom of the bottom sleeve 24. The conduit 30 covers the bottom vent hole 25.

[0046] After the oil box 29 is connected to the connecting sleeve 27, the lower surface of the conduit 30 does not contact the bottom of the inner cavity of the oil box 29. The oil box 29 contains insulating oil, and the upper surface of the insulating oil covers the lower surface of the conduit 30. Both the oil box 29 and the conduit 30 can be made of transparent material to facilitate real-time observation of the changes in the insulating oil level in the oil box 29 and the conduit 30.

[0047] When the airflow flows into the airbag, the detection element 37 can detect the gas after passing through the drying chamber. If the detection element 37 detects that the airflow velocity is large and the airflow humidity gradually increases from small to large, it means that the water-absorbing particles 23 in the drying chamber are saturated with water, but there is no blockage of the air pores. The airflow cannot continue to absorb water, but it does not affect the gas flow. At this time, with the cooperation of the PLC control system, the water absorption box 20 is rotated so that the next drying chamber is aligned with the top air pore 18, the connecting pipe 16, and the bottom air pore 25. The airflow continues to be dried by the water-absorbing particles 23 that have not absorbed water in the next drying chamber. If the detection component 37 detects that the airflow velocity is close to zero and the airflow humidity remains unchanged, it indicates that the water-absorbing particles 23 at the lower part of one of the drying chambers quickly absorb water and become saturated. Due to the low temperature, they stick together and cause the air pores to become blocked. At this time, with the cooperation of the PLC control system, the water absorption box 20 is rotated so that the next drying chamber is aligned with the top air pore 18, the connecting pipe 16, and the bottom air pore 25. The airflow continues to be dried by the water-absorbing particles 23 in the next drying chamber that have not absorbed water.

[0048] Furthermore, the top cover 17 has a top air hole 2 19, and the bottom sleeve 24 has a bottom air hole 26. The upper surface of the top cover 17 is connected to the top air hole 2 19 and the inner wall of the top air hole 2 40 is connected to a hot air assembly.

[0049] When the water-absorbing particles 23 in one of the drying chambers are saturated with water, after the water-absorbing box 20 rotates, the two through vents 22 of the drying chamber are connected to the top vent 19 and the bottom vent 26, respectively.

[0050] When the absorbent particles 23 in one of the drying chambers become saturated with water, the absorbent box 20 rotates, causing the other drying chamber to rotate to a position aligned with and connected to the top air vent 18 and the bottom air vent 25. The absorbent particles 23 in the other drying chamber continue to absorb water from the airflow. The absorbent particles 23 that have become saturated with water, or some of the absorbent particles 23 that have become saturated with water, stick together due to the low temperature. The drying chamber blocking the air vents is rotated so that the through air vent 22 connects with the top air vent 19 and the bottom air vent 26 respectively. At this time, the hot air component works, generating high-temperature hot air that flows into the drying chamber. The high-temperature hot air dries the saturated absorbent particles 23. After a period of time, the saturated absorbent particles 23 can be restored to their blue color and can be reused, further extending the service life of the respirator. It also allows for the recycling and reuse of the variable-speed silicone after it has become saturated with water, saving energy.

[0051] If one of the drying chambers operates for a long time, but the detection point 37 does not detect a possible water saturation, the PLC control system will also operate, rotating the water absorption box 20 to adjust and replace the working drying chamber, ensuring its drying effect. The water-absorbing particles 23 in the replaced drying chamber can be quickly dehydrated and restored to a reused state under the action of the hot air assembly, and can continue to be used in the next cycle.

[0052] Furthermore, a detection element 2 39 is fixedly connected to the inner wall of the bottom vent 2 26 via a fixing bracket 3 38. The detection element 2 39 is existing technology and can monitor the humidity of the gas flowing through the bottom vent 2 26. A valve is movably connected to the inner wall of the bottom vent 2 26. The valve is existing technology, including electrically controlled valves. The bottom vent 2 26 is located inside the conduit 5 30, and a baffle is provided in the middle of the conduit 5 30 to separate the bottom vent 1 25 and the bottom vent 2 26.

[0053] When the water-absorbing particles 23 in one of the drying chambers are saturated with water, the water-absorbing box 20 rotates, causing the other drying chamber to rotate to a position aligned and connected with the top air hole 18 and the bottom air hole 25. At this time, the two through air holes 22 of one of the drying chambers are connected to the top air hole 29 and the bottom air hole 26 respectively, and the valve in the bottom air hole 26 is opened.

[0054] When the hot air assembly generates hot air, the airflow will be blown out through the bottom air hole 26 into the insulating oil in the oil box 29, and finally discharged through the connecting air hole 28. If the humidity detected by the detection element 2 39 changes from high to low and gradually tends to remain unchanged, it indicates that the drying treatment of the water-absorbing particles 23 in the drying chamber is completed. At this time, the valve is closed to ensure that subsequent use is not affected.

[0055] Furthermore, the hot air assembly includes a fan 45 movably connected via a fixed bracket 44, and a heating device 46 fixedly connected to the inner wall of the bottom of the fan 45 via a duct 40. Both the fan 45 and the heating device 46 are existing technologies used to generate high-temperature hot air, which can dry the water-saturated water-absorbing particles 23 in the drying chamber. An air inlet ear plate 41 is fixedly connected to the top of the duct 40, and a protective cover 43 is fixedly connected to the upper surface of the air inlet ear plate 41. Multiple air inlets 42 are provided on the air inlet ear plate 41, and the openings of the air inlets 42 communicate with the inside of the protective cover 43. The inlets of the air inlets 42 are blocked by the side of the air inlet ear plate 41. Together with the function of the protective cover 43, the duct 40 can protect the internal structure of the duct 40, preventing dust, particulate matter, rainwater, etc. from falling into the drying chamber through the duct 40 and the top air hole 19 when used outdoors.

[0056] Furthermore, the airbag includes an elastic bladder 4 and a collecting conduit 6. The inner walls of both the elastic bladder 4 and the collecting conduit 6 are coated with a hydrophobic material, such as a polytetrafluoroethylene modified coating, to prevent water droplets from adhering to the inner walls of the elastic bladder 4 and the collecting conduit 6. The collecting conduit 6 is fixedly connected to the bottom of the elastic bladder 4. One end of the collecting conduit 6 is fixedly connected to a liquid collection box 7. The collecting conduit 6 and the liquid collection box 7 are inclined toward the liquid collection box 7. A liquid level sensor 8 is fixedly connected to the inner wall of the liquid collection box 7. An outlet component is provided inside the liquid collection box 7.

[0057] The export component includes a connecting tube 5 connecting the elastic bladder 4 and the oil reservoir 3. One end of the connecting tube 5 is connected to a tee 10. One opening of the tee 10 is connected to a conduit 11, and the other opening of the tee 10 is connected to a conduit 12. One end of the conduit 12 is connected to a liquid pump 13. The output end of the liquid pump 13 is connected to a conduit 14. A conduit 9 is fixedly connected to the inner wall of the conduit 12. Liquid is drawn out through the conduit 9 to the conduit 12, while the gas in the elastic bladder 4 can only be discharged through the tee 10 and the conduit 11, and will not be discharged through the conduit 12. The conduit 9 is connected to the connecting tube 5 and the tee 10 through multiple fixing brackets 15. The conduit 9 extends through the tee 10 and the connecting tube 5 to the liquid collection box 7.

[0058] Although the airbag is designed to be sealed, the following problems may occur after long-term operation: If the air entering the airbag contains moisture, when the transformer stops or the ambient temperature drops suddenly, the temperature inside the airbag decreases, and the water vapor in the air will condense into water droplets on the inner wall of the airbag, resulting in condensation.

[0059] As the airbag material ages, it is affected by oil mist and temperature changes over a long period of time, which can cause tiny cracks and pinholes. Condensed water droplets can seep into the insulating oil on the outside of the capsule through these tiny damage points, causing the oil to become damp and its dielectric strength to decrease, which may lead to winding insulation breakdown faults.

[0060] In this application, by coating the inner walls of the elastic capsule 4 and the collecting conduit 6 with a hydrophobic material, condensed water droplets gradually fall down the inner walls of the elastic capsule 4 and the collecting conduit 6 and collect in the collecting conduit 6. Due to the inclined setting of the collecting conduit 6, the droplets collected in the collecting conduit 6 will fall into the liquid collection box 7. When the liquid level sensor 8 in the liquid collection box 7 detects the presence of liquid, the liquid pump 13 starts, and the liquid in the liquid collection box 7 is drawn out through the first conduit 9 to the third conduit 12, and then discharged through the fourth conduit 14 to the gas external box for temporary storage. Through the above technical solution, not only can the possibility of water condensing inside the elastic capsule 4 be further reduced, but the condensed water can also be discharged in time, avoiding the accumulation of condensed water inside the elastic capsule 4, which could seep into the insulating oil outside the capsule through tiny damage points, causing the oil to become damp, the dielectric strength to decrease, and potentially causing winding insulation breakdown faults.

Claims

1. An oil-immersed transformer for easy replacement of insulating oil, comprising a transformer body (1), heat sinks (2) provided on the outer peripheral surface of the transformer body (1), and an oil conservator (3) fixedly connected to one side of the upper surface of the transformer body (1), characterized in that: An airbag is provided inside the oil pillow (3), and the airbag extends through the second conduit (11) to one end of the oil pillow (3) and is connected to a respirator. The respirator includes a connecting tube two (16) connected to the second tube (11). The bottom of the connecting tube two (16) is fixedly connected to a connecting shell. A water-absorbing box (20) is movably connected inside the connecting shell. The inside of the water-absorbing box (20) is divided into multiple drying chambers by multiple partitions (21). Each drying chamber is filled with water-absorbing particles (23). In the initial stage, the airbag, the second conduit (11), and the second connecting tube (16) are connected to the external environment through one of the drying chambers by the function of the connecting shell. When the water-absorbing particles (23) in one drying chamber are saturated with water, the water-absorbing box (20) rotates in the connecting shell, so that the next drying chamber is connected to the airbag and the external environment.

2. The oil-immersed transformer with easy replacement of insulating oil according to claim 1, characterized in that: Each drying chamber has through-holes (22) at the top and bottom; The connecting shell includes a top cover (17) fixedly connected to the bottom of the connecting tube two (16). The top cover (17) has a top air hole one (18) located inside the connecting tube two (16). The top of the water absorption box (20) is movably connected to the inner wall of the top cover (17). It also includes a bottom sleeve (24) that is detachably connected to the top cover (17), the bottom of the water absorption box (20) is movably connected to the inner wall of the bottom sleeve (24), and a bottom air hole (25) is provided on the bottom sleeve (24). In the initial stage, two through-holes (22) on one of the drying chambers are connected to the top air hole (18) and the bottom air hole (25) respectively. After the water-absorbing particles (23) in one of the drying chambers are saturated with water, the water-absorbing box (20) rotates, so that the two through-holes (22) of the next drying chamber are connected to the top air hole (18) and the bottom air hole (25). The top of the inner cavity of the top cover (17) and the bottom of the inner cavity of the bottom sleeve (24) respectively block the multiple through vents (22) on other drying cavities.

3. The oil-immersed transformer with easy replacement of insulating oil according to claim 2, characterized in that: A rotating shaft (33) is fixedly connected on the central axis of the water absorption box (20). The two ends of the rotating shaft (33) are movably connected to the top cover (17) and the bottom sleeve (24) respectively. A gear (34) is fixedly connected to one end of the rotating shaft (33) extending to the outside of the top cover (17). A drive device (35) is fixedly connected to the top cover (17) to drive the rotating shaft (33) and the water absorption box (20) to rotate together.

4. An oil-immersed transformer for easy replacement of insulating oil according to claim 3, characterized in that: The inner wall of the connecting pipe 2 (16) is fixedly connected to the detection component 1 (37) by the fixing bracket 2 (36).

5. An oil-immersed transformer for easy replacement of insulating oil according to claim 2, characterized in that: The lower surface of the bottom sleeve (24) is fixedly connected to a connecting sleeve (27), and the top outer circumferential surface of the connecting sleeve (27) is provided with multiple communicating air holes (28). The bottom end of the connecting sleeve (27) is movably connected to an oil box (29), and the bottom of the bottom sleeve (24) is fixedly connected to a conduit five (30), which covers the bottom air hole one (25). After the oil box (29) is connected to the connecting sleeve (27), the lower surface of the conduit five (30) does not contact the bottom of the inner cavity of the oil box (29). The oil box (29) contains insulating oil, and the upper surface of the insulating oil covers the lower surface of the conduit five (30).

6. An oil-immersed transformer for easy replacement of insulating oil according to claim 2, characterized in that: The top cover (17) has a top air hole two (19), and the bottom sleeve (24) has a bottom air hole two (26). The upper surface of the top cover (17) is connected to the top air hole two (19) and the conduit six (40) is connected to the inner wall of the conduit six (40). When the water-absorbing particles (23) in one of the drying chambers are saturated with water, after the water-absorbing box (20) is rotated, the two through air holes (22) of the drying chamber are connected to the top air hole (19) and the bottom air hole (26) respectively.

7. An oil-immersed transformer for easy replacement of insulating oil according to claim 6, characterized in that: The inner wall of the bottom air hole 2 (26) is fixedly connected to the detection element 2 (39) by the fixing bracket 3 (38), and the inner wall of the bottom air hole 2 (26) is movably connected to the valve.

8. An oil-immersed transformer for easy replacement of insulating oil according to claim 6, characterized in that: The hot air assembly includes a fan (45) movably connected via a four-piece bracket (44), and a heating device (46) is fixedly connected to the inner wall at the bottom of the fan (45) via a six-piece duct (40).

9. An oil-immersed transformer for easy replacement of insulating oil according to claim 1, characterized in that: The airbag includes an elastic bladder (4) and a collecting conduit (6). The inner walls of the elastic bladder (4) and the collecting conduit (6) are coated with a hydrophobic material. The collecting conduit (6) is fixedly connected to the bottom of the elastic bladder (4). One end of the collecting conduit (6) is fixedly connected to a liquid collection box (7). The collecting conduit (6) and the liquid collection box (7) are inclined toward the liquid collection box (7).

10. An oil-immersed transformer for easy replacement of insulating oil according to claim 9, characterized in that: A liquid level sensor (8) is fixedly connected to the inner wall of the liquid collection box (7), and an outlet component is provided inside the liquid collection box (7).

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