An oil-immersed transformer

Abstract

This invention relates to the field of transformer technology, specifically an oil-immersed transformer. The transformer includes an oil tank with a support frame at its bottom. Heat dissipation fins are evenly distributed on the outer wall of the oil tank. A top sealing plate is fixedly installed on the top of the oil tank. An iron core is installed inside the oil tank, and a coil winding is mounted on the iron core. The coil winding is connected to a lead-out sleeve fixed to the top of the top sealing plate via wires. An oil conservator is fixed to one corner of the top of the top sealing plate, and an alternating breathing mechanism is installed on the oil conservator. This invention uses a drive motor to periodically rotate the rotating frame intermittently, causing three sets of moisture-absorbing shells to participate in the drying process in an intermittent cycle of moisture absorption, drying, and standby mode. This avoids the desiccant inside a single moisture-absorbing shell becoming saturated and ineffective due to long-term operation, ensuring that the air cavity of the oil conservator is always connected to dry air. This effectively prevents moisture from entering the transformer oil, ensuring stable transformer insulation performance, eliminating the need for frequent manual desiccant replacement, and reducing maintenance costs and downtime risks.

Description

Technical Field

[0001] This invention belongs to the field of transformer technology, and specifically relates to an oil-immersed transformer. Background Technology

[0002] Oil-immersed transformers, as core equipment for power conversion and transmission in power systems, are mainly composed of components such as oil tanks, support frames, coil windings, oil conservators, and dehumidifiers. They achieve voltage transformation through electromagnetic induction between the iron core and the coil windings, rely on transformer oil for insulation protection and heat transfer, utilize the oil conservator to adapt to the thermal expansion and contraction of the transformer oil, and filter and dry the air entering the oil conservator through the dehumidifier. They are widely used in many fields such as industrial production, urban power grids, and new energy grid connection.

[0003] Existing dehumidifiers for oil-immersed transformers mostly use a single-cavity desiccant structure. The desiccant adsorbs moisture from the air to protect the transformer oil from moisture. However, the desiccant in a single cavity is prone to saturation and failure after long-term use, requiring manual disassembly and replacement periodically. This not only increases maintenance costs and downtime, but also may lead to moisture intrusion into the transformer oil and affect the insulation performance of the equipment if replacement is not timely. Therefore, it is necessary to design an oil-immersed transformer. Summary of the Invention

[0004] The purpose of this invention is to provide an oil-immersed transformer with a simple structure and reasonable design in order to solve the above-mentioned problems.

[0005] The present invention achieves the above objectives through the following technical solutions: An oil-immersed transformer includes an oil tank with a support frame at the bottom and heat dissipation fins evenly distributed on the outer wall of the tank. A top sealing plate is fixedly installed on the top of the tank. An iron core is installed inside the tank, and a coil winding is installed on the iron core. The coil winding is connected to a lead-out sleeve fixed to the top of the top sealing plate via a wire. An oil conservator is fixed to one corner of the top of the top sealing plate. An alternating breathing mechanism is installed on the oil conservator. The alternating breathing mechanism includes a closed cover fixed to one side of the oil conservator, a drive motor fixed inside the closed cover, and a rotating frame fixed through the output end of the drive motor. Moisture-absorbing shells are evenly distributed on the rotating frame, filled with desiccant, and equipped with a self-sealing mechanism. A drying mechanism is installed on one side of the oil conservator.

[0006] As a further optimization of the present invention, the self-sealing mechanism includes a first slot and a second slot formed on the side wall of the moisture-absorbing shell, and an isolation screen is fixed on both the first slot and the second slot. Limiting slides are formed on the side wall of the moisture-absorbing shell near the first slot and the second slot.

[0007] As a further optimization of the present invention, an iron ring is slidably connected in the limiting slide, and a magnetic block is fixed at one end of the moisture-absorbing shell near the limiting slide, and the iron ring is fixed on the connector.

[0008] As a further optimization of the present invention, a sealing plate is fixedly connected to the connector, the sealing plate is attached to the side wall of the moisture-absorbing shell, an elastic sheet is fixed on one side of the sealing plate, and a scraper that is slidably connected to the isolation screen is fixed on the other side of the sealing plate.

[0009] As a further optimization of the present invention, an outer shell is fixed on the oil storage tank, and a connecting shell is provided on one side of the oil storage tank. The connecting shell and the rotating frame are both located inside the outer shell.

[0010] As a further optimization of the present invention, the connecting shell is slidably connected to the moisture-absorbing shell, and a limiting frame is fixed on the connecting shell, with a removable elastic sheet for the limiting frame.

[0011] As a further optimization of the present invention, the drying mechanism includes a conveyor cover fixed on the oil storage tank, a detachable abutment elastic sheet for the conveyor cover, and a circulation fan fixed inside the conveyor cover.

[0012] As a further optimization of the present invention, a connecting shell is fixed to the bottom of the conveying cover, and the bottom of the connecting shell is fixed to a heat dissipation fin on one side.

[0013] As a further optimization of the present invention, an oil drain pipe communicating with the inner cavity of the oil tank is provided on one side bottom of the oil tank, and a reinforcing frame welded to the heat dissipation fins is fixed on the side wall of the oil tank.

[0014] The beneficial effects of this invention are as follows: 1. This invention uses a drive motor to periodically rotate the rotating frame intermittently, causing three sets of moisture-absorbing shells to participate in the drying process in an intermittent cycle of moisture absorption, drying, and standby mode. During operation, one set of moisture-absorbing shells works in conjunction with the connecting shell to perform air drying tasks, while the other two sets are in drying regeneration or sealed standby states, respectively. This avoids the desiccant inside the shell becoming saturated and ineffective due to long-term operation of a single moisture-absorbing shell, ensuring that the air cavity of the oil conservator is always connected to dry air, effectively preventing moisture from entering the transformer oil, ensuring stable transformer insulation performance, eliminating the need for frequent manual replacement of the desiccant, and reducing maintenance costs and downtime risks.

[0015] 2. When the drying mechanism of this invention is working, the circulating fan drives the external airflow through the heat dissipation fins on the outer wall of the oil tank. The airflow is preheated by the residual heat generated by the transformer body and dissipated through the heat dissipation fins during the operation of the transformer. The preheated hot air then enters the moisture-absorbing shell through the second slot to dry and regenerate the desiccant after it has absorbed moisture. This realizes the reuse of the residual heat from the transformer heat dissipation, eliminating the need for additional high-power heating components. This saves energy consumption and provides a suitable drying temperature for the desiccant, accelerating the dehydration and regeneration speed of the desiccant, shortening the regeneration cycle, and ensuring that the moisture-absorbing shell quickly restores its moisture-absorbing performance.

[0016] 3. When the moisture-absorbing shell of this invention switches working states, the connecting shell or the limiting frame abuts against the elastic sheet, pushing the iron ring to slide along the limiting slide and detach from the magnetic block's adsorption. This causes the sealing plate to move and gradually open the first and second slots, ensuring air circulation and drying effect. When the moisture-absorbing shell rotates and switches positions again, the elastic sheet detaches from the connecting shell or the limiting frame and deforms. The magnetic block re-adsorbs the iron ring, and the sealing plate is reset through the connecting piece, sealing the slots of the moisture-absorbing shell to prevent moisture from entering during standby or drying processes. At the same time, during the movement of the sealing plate, the flexible nylon scraper on one side slides along the isolation screen to scrape away dust and impurities attached to the mesh, preventing the isolation screen from clogging and affecting air circulation efficiency, and ensuring smooth moisture absorption and drying processes. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram showing the position of the support frame in this invention; Figure 3 This is a schematic diagram showing the positions of the coil winding and the lead sleeve in this invention; Figure 4 This is a schematic diagram showing the location of the drying mechanism in this invention; Figure 5 This is a schematic diagram of the alternating breathing mechanism in this invention; Figure 6 This is an exploded view of the alternating breathing mechanism in this invention; Figure 7 yes Figure 6 A magnified view of a portion of region A in the middle; Figure 8 This is a schematic diagram of the self-closing mechanism in this invention.

[0018] In the diagram: 1. Oil tank; 2. Support frame; 3. Alternating breathing mechanism; 4. Heat dissipation fins; 5. Drying mechanism; 6. Coil winding; 7. Outlet sleeve; 8. Oil drain pipe; 9. Upper sealing plate; 10. Oil storage tank; 11. Outer shell; 12. Connecting shell; 13. Limiting frame; 14. Reinforcing frame; 31. Enclosed cover; 32. Drive motor; 33. Rotating frame; 34. Moisture-absorbing shell; 35. Self-sealing mechanism; 51. Conveying cover; 52. Circulating fan; 53. Connecting shell; 351. First slot; 352. Second slot; 353. Isolation screen; 354. Limiting slide; 355. Iron ring; 356. Magnetic block; 357. Connector; 358. Sealing plate; 359. Elastic sheet; 360. Scraper. Detailed Implementation

[0019] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0020] Example: Please refer to Figures 1-8An oil-immersed transformer includes an oil tank 1, a support frame 2 at the bottom of the oil tank 1 for supporting and fixing the oil tank 1 to the mounting foundation, maintaining a distance between the bottom of the oil tank 1 and the mounting foundation, heat dissipation fins 4 evenly distributed on the outer wall of the oil tank 1, and an upper sealing plate 9 fixedly installed on the top of the oil tank 1. An iron core is installed inside the oil tank 1, and a coil winding 6 is installed on the iron core. The heat dissipation fins 4 increase the contact area between the oil tank 1 and the outside air, accelerating the dissipation of heat from the transformer oil inside the oil tank 1, and quickly dissipating the heat generated by the iron core and coil winding 6 during operation, preventing the transformer from experiencing performance degradation or component damage due to overheating. The coil winding 6 is wound on the iron core and together with the iron core constitutes the core of the transformer body, achieving operation through the principle of electromagnetic induction. Voltage transformation and electrical energy transmission are the core components of a transformer for achieving electrical energy conversion. The coil winding 6 is connected by wires to an outlet sleeve 7 fixed to the top of the upper sealing plate 9. The oil tank 1, as the main load-bearing structure of the oil-immersed transformer, contains transformer oil and seals the transformer body, providing a sealed working environment for the core and coil winding 6. Immersion in transformer oil provides insulation protection and heat transfer to the transformer body. The outlet sleeve 7 enables electrical connection between the coil winding 6 and the external circuit, while simultaneously preventing leakage of transformer oil inside the oil tank 1 and isolating high-voltage live parts from the grounding portion of the oil tank 1. The upper sealing plate 9 seals the top of the oil tank 1, providing a stable mounting base for the outlet sleeve 7, oil conservator 10, and other upper components. To ensure the overall sealing performance of the oil tank 1, an oil drain pipe 8 is provided at the bottom of one side of the oil tank 1, connecting to the inner cavity of the oil tank 1. The oil drain pipe 8 is connected to the bottom of one side of the oil tank 1 and is used to drain the transformer oil inside the oil tank 1, which facilitates the inspection, maintenance, and replacement of deteriorated transformer oil. The bottom position ensures that the transformer oil in the oil tank 1 can be completely drained. A reinforcing frame 14 is fixed to the side wall of the oil tank 1 and welded to the heat dissipation fins 4. The reinforcing frame 14 is used to strengthen the connection strength between the heat dissipation fins 4 and the oil tank 1, and to prevent the heat dissipation fins 4 from deforming or falling off due to external impact or long-term thermal expansion and contraction, so as to ensure the integrity and service life of the heat dissipation structure. An oil conservator 10 is fixed to one corner of the top of the upper sealing plate 9. The oil conservator 10 serves as a storage tank for transformer oil. The transformer oil is equipped with a compensation device to adapt to the volume expansion and contraction of the transformer oil due to temperature changes, reduce the contact area between the transformer oil and the outside air, and slow down the oxidation and moisture absorption rate of the transformer oil. The oil conservator 10 is equipped with an alternating breathing mechanism 3, which serves as a communication component between the air chamber of the oil conservator 10 and the outside, realizing the breathing function of the oil conservator 10, effectively filtering and drying the outside air entering the oil conservator 10, preventing moisture from entering the transformer oil, and improving the insulation stability of the transformer. Through the alternating working mode, different parts can be used alternately for drying. A drying mechanism 5 is provided on one side of the oil conservator 10, which is used to regenerate and dry the alternating breathing mechanism 3.Promptly remove moisture adsorbed by the alternating breathing mechanism 3 to restore its moisture absorption performance, enabling continuous operation without manual replacement and reducing equipment maintenance costs.

[0021] Please see Figures 5-8 The alternating breathing mechanism 3 includes a closed cover 31 fixed to one side of the oil tank 10. A drive motor 32 is fixed inside the closed cover 31. The output end of the drive motor 32 passes through the closed cover 31 and is fixed to a rotating frame 33. Three moisture-absorbing shells 34 are evenly arranged on the rotating frame 33. Each moisture-absorbing shell 34 is filled with a desiccant for absorbing moisture from the air. The desiccant is a nano-silica-based composite desiccant. (The nano-silica-based composite desiccant can be dried and regenerated at a low temperature of 50-60 degrees Celsius, and the nano-silica-based composite...) (The desiccant is existing technology and will not be discussed in detail here.) A self-sealing mechanism 35 is provided on the moisture-absorbing shell 34. The self-sealing mechanism 35 includes a first slot 351 and a second slot 352 formed on the side wall of the moisture-absorbing shell 34. An isolation screen 353 is fixed to both the first slot 351 and the second slot 352. The isolation screen 353 can prevent desiccant particles from detaching from the inside of the moisture-absorbing shell 34. Limiting slides 354 are formed on the side wall of the moisture-absorbing shell 34 near the first slot 351 and the second slot 352. The limiting slides 354... A sliding iron ring 355 is connected, and a magnetic block 356 is fixed at one end of the moisture-absorbing shell 34 near the limiting slide 354. The magnetic force generated by the magnetic block 356 can attract the iron ring 355 in a non-forced state, so that the iron ring 355 is located at one end of the limiting slide 354. The iron ring 355 is fixed to the connector 357, and a sealing plate 358 is fixedly connected to the connector 357. A sealing gasket is fixed to the connector 357, and the sealing gasket is tightly attached to the sealing plate 358 and the moisture-absorbing shell 34. The sealing plate 358 is attached to the moisture-absorbing shell 34. On the side wall, after the magnetic block 356 adsorbs the iron ring 355, the sealing plate 358 can completely seal the first slot 351 and the second slot 352. An elastic sheet 359 is fixed on one side of the sealing plate 358, and a scraper 360 made of flexible nylon material is fixed on the other side of the sealing plate 358. The scraper 360 is slidably connected to the isolation screen 353. During the process of the iron ring 355 sliding along the limiting slide 354, the scraper 360 can clean the dust attached to the mesh of the isolation screen 353, preventing the isolation screen 353 from being blocked.

[0022] An outer casing 11 is fixed to the oil tank 10. A connecting casing 12 is provided on one side of the oil tank 10, which is connected to the air cavity inside the oil tank 10. The connecting casing 12 and the rotating frame 33 are both located inside the outer casing 11. The connecting casing 12 is slidably connected to the moisture-absorbing casing 34. A limit frame 13 is fixed on the connecting casing 12. The limit frame 13 is detachable and abuts against the elastic sheet 359. When the transformer is operating normally, the drive motor 32 maintains the position of the rotating frame 33 and the moisture-absorbing casing 34. The moisture-absorbing casing 34 is tightly attached to the connecting casing 12. At this time, the elastic sheet 359 on the sealing plate 358 that closes the first slot 351 is abutted by the connecting casing 12. The sealing plate 358 disengages from the first slot 351, and at the same time, the elastic sheet 359 on the sealing plate 358 that seals the second slot 352 is abutted by the limiting frame 13. This sealing plate 358 disengages from the second slot 352. During equipment operation, the sealing gasket fixedly sleeved on the connector 357 ensures that external air can only pass through the first slot 351 of the moisture-absorbing shell 34 to enter the connecting shell 12. When the volume of transformer oil inside the oil tank 1 changes, external air needs to pass through the second slot 352 to enter the moisture-absorbing shell 34. After the desiccant absorbs moisture, it can pass through the first slot 351 to enter the connecting shell 12 and mix with the air in the air cavity of the oil conservator 10.

[0023] The drying mechanism 5 includes a conveyor cover 51 fixed to the oil tank 10. The conveyor cover 51 has a detachable abutment elastic sheet 359. A circulation fan 52 is fixed inside the conveyor cover 51. The circulation fan 52 consists of a motor and fan blades and can blow air from the conveyor cover 51 into the moisture-absorbing shell 34. A connecting shell 53 is fixed to the bottom of the conveyor cover 51. The bottom of the connecting shell 53 is fixed to a heat dissipation fin 4 on one side. During long-term operation, the drive motor 32 starts at regular intervals, driving the rotating frame 33 and the moisture-absorbing shell 34 to rotate 120 degrees. During the process, the elastic sheet 359 is deformed by the pressure of the connecting shell 12 and the limiting frame 13 until it detaches from the connecting shell 12 or the limiting frame 13. After rotating 120 degrees, the moisture-absorbing shell 34, which was originally close to the connecting shell 12, is now close to the conveyor cover 51. At the same time, the next set of moisture-absorbing shells 34 replaces it and reconnects with the connecting shell 12. The sealing plates on the first slot 351 and the second slot 352 of the moisture-absorbing shell 34 of the adjacent conveyor cover 51 are sealed. The elastic sheet 359 on 358 is abutted by the limiting frame 13, fully opening the first slot 351 and the second slot 352. At this time, the second slot 352 connects to the conveyor cover 51. Under the action of the circulating fan 52, the external airflow passes through the heat dissipation fins 4 for preheating, and then enters the moisture-absorbing shell 34 through the second slot 352 to dry the desiccant in the moisture-absorbing shell 34. After drying, it stops until the drive motor 32 starts again. Before the drive motor 32 starts again, the circulating fan 52 is opened again to dry the desiccant a second time. After the second drying, the drive motor 32 rotates 120 degrees. During the rotation, the elastic sheet 359 disengages from the limiting frame 13. Under the magnetic force of the magnetic block 356, the iron ring 355 drives the sealing plate 358 through the connector 357 to completely seal the first slot 351 and the second slot 352. At this time, the completely sealed moisture-absorbing shell 34 serves as a spare group until the drive motor 32 starts again to realize the intermittent cyclic use of the three groups of moisture-absorbing shells 34.

[0024] It should be noted that, in the operation of this type of oil-immersed transformer, after the transformer is started, the core of the transformer body, consisting of the coil winding 6 and the iron core, achieves voltage transformation and power transmission through the principle of electromagnetic induction: the iron core guides the magnetic field to form a closed magnetic circuit, and the coil winding 6 completes the conversion of high-voltage and low-voltage power through the difference in the number of turns. The converted power is output to the external circuit through the outlet sleeve 7. During operation, the heat generated by the transformer body is absorbed and transferred through the transformer oil in the oil tank 1. The heat dissipation fins 4 on the outer wall of the oil tank 1 increase the heat dissipation area and quickly dissipate heat to avoid overheating; strengthening... The frame 14 strengthens the connection stability between the heat dissipation fins 4 and the oil tank 1, ensuring the long-term operation of the heat dissipation structure. The oil tank 1, as a sealed carrier, achieves insulation protection and heat conduction of the transformer body through transformer oil. The upper sealing plate 9 ensures the sealing performance of the oil tank 1. The oil conservator 10 compensates for the oil volume according to the temperature expansion and contraction of the transformer oil, reduces the contact area between the oil and air, and delays the oxidation and moisture absorption of the oil. The drain pipe 8 is used to drain the transformer oil in the oil tank 1 during subsequent maintenance. The support frame 2 provides stable support for the oil tank 1 and the installation foundation, avoids bottom corrosion, and ensures ventilation. When the transformer is working, the transformer oil in tank 1 undergoes volume changes due to temperature variations, which in turn causes changes in the air pressure inside the conservator 10, creating a breathing cycle. When the transformer oil temperature decreases and its volume shrinks, it draws in air, causing the air pressure in the conservator 10's air cavity to drop, requiring outside air to enter. At this time, the moisture-absorbing shell 34, which cooperates with the connecting shell 12 in the alternating breathing mechanism 3, is in operation. The elastic sheet 359 is abutted by the connecting shell 12 and the limiting frame 13, pushing the sealing plate 358 along the limiting slide 354 to the end, opening the first slot 351 and the second slot 352; outside air flows through... The second slot 352 enters the moisture-absorbing shell 34, where the internal desiccant absorbs moisture to achieve drying. The dried air passes through the first slot 351 into the connecting shell 12 and finally flows into the air cavity of the oil conservator 10, completing the intake and air drying. When the transformer oil temperature rises and its volume expands, it exhales, the air pressure in the air cavity of the oil conservator 10 increases, and the internal air is discharged in the opposite direction. The discharged air enters the moisture-absorbing shell 34 through the connecting shell 12 and is discharged to the outside through the first slot 351, the desiccant layer, and the second slot 352. The desiccant can absorb the trace amounts of residual moisture in the air a second time, further ensuring that the oil is not damp. To achieve continuous moisture absorption, the three sets of moisture-absorbing shells 34 are driven by a drive motor 32 to rotate the frame 33, switching cyclically between moisture absorption, drying, and standby. The drive motor 32 starts at regular intervals, causing the rotating frame 33 to rotate 120 degrees. During rotation, the elastic sheet 359 disengages from the pressure, the magnetic block 356 attracts the iron ring 355, and the sealing plate 358 is reset through the connector 357, sealing the moisture-absorbing shell 34 that has completed moisture absorption to prevent moisture from entering during transportation. After the moisture-absorbing shell 34 has completed moisture absorption, it rotates to the corresponding station of the drying mechanism 5, and the elastic sheet 359 is abutted by the conveyor cover 51 and the limiting frame 13, reopening the first slot 351 and the second slot 352. The circulating fan 52 starts, and the external airflow is preheated by the heat dissipation fins 4. Afterwards, the desiccant in the moisture-absorbing shell 34 is dried with hot air through the connecting shell 53 and the conveying cover 51 to restore its moisture-absorbing performance. After the first drying, the desiccant is allowed to stand. Before the drive motor 32 is started again, the circulating fan 52 is started again for deep drying to ensure that the desiccant is completely regenerated. After the second drying is completed, the drive motor 32 drives the rotating frame 33 to rotate 120 degrees again. The regenerated moisture-absorbing shell 34 enters the standby position, the elastic sheet 359 is released from the pressure, and the seal 358 closes the slot under the magnetic force of the magnetic block 356. At the same time, the next set of standby moisture-absorbing shells 34 is switched to the working position to continue to perform the breathing drying task, realizing the uninterrupted circulation of the three sets of moisture-absorbing shells 34 without the need for manual replacement of the desiccant.

[0025] The above-described embodiments are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. An oil-immersed transformer, comprising an oil tank (1), characterized in that: The bottom of the oil tank (1) is provided with a support frame (2), and heat dissipation fins (4) are evenly arranged on the outer wall of the oil tank (1). The top of the oil tank (1) is fixedly installed with an upper sealing plate (9). An iron core is provided inside the oil tank (1), and a coil winding (6) is provided on the iron core. The coil winding (6) is connected to a wire outlet sleeve (7) fixed on the top of the upper sealing plate (9) through a wire. An oil storage tank (10) is fixed on one corner of the top of the upper sealing plate (9), and an alternating breathing mechanism (3) is provided on the oil storage tank (10). The alternating breathing mechanism (3) includes a closed cover (31) fixed on one side of the oil tank (10), a drive motor (32) fixed inside the closed cover (31), a rotating frame (33) fixed through the output end of the drive motor (32) through the closed cover (31), a moisture-absorbing shell (34) evenly arranged on the rotating frame (33), a desiccant filled inside the moisture-absorbing shell (34), and a self-sealing mechanism (35) provided on the moisture-absorbing shell (34). A drying mechanism (5) is provided on one side of the oil tank (10).

2. The oil-immersed transformer according to claim 1, characterized in that: The self-sealing mechanism (35) includes a first slot (351) and a second slot (352) opened on the side wall of the moisture-absorbing shell (34). An isolation screen (353) is fixed on both the first slot (351) and the second slot (352). A limit slide (354) is opened on the side wall of the moisture-absorbing shell (34) near the first slot (351) and the second slot (352).

3. An oil-immersed transformer according to claim 2, characterized in that: An iron ring (355) is slidably connected in the limiting slide (354), and a magnetic block (356) is fixed at one end of the moisture-absorbing shell (34) near the limiting slide (354), and the iron ring (355) is fixed on the connector (357).

4. An oil-immersed transformer according to claim 3, characterized in that: A sealing plate (358) is fixedly connected to the connector (357). The sealing plate (358) is attached to the side wall of the moisture-absorbing shell (34). An elastic sheet (359) is fixed on one side of the sealing plate (358), and a scraper (360) that is slidably connected to the isolation screen (353) is fixed on the other side of the sealing plate (358).

5. An oil-immersed transformer according to claim 4, characterized in that: An outer shell (11) is fixed on the oil storage tank (10), and a connecting shell (12) is provided on one side of the oil storage tank (10). The connecting shell (12) and the rotating frame (33) are both located inside the outer shell (11).

6. An oil-immersed transformer according to claim 5, characterized in that: The connecting shell (12) is slidably connected to the moisture-absorbing shell (34), and a limiting frame (13) is fixed on the connecting shell (12). The limiting frame (13) is detachable from the abutment elastic sheet (359).

7. An oil-immersed transformer according to claim 4, characterized in that: The drying mechanism (5) includes a conveyor cover (51) fixed on the oil storage tank (10), a removable abutment elastic sheet (359) of the conveyor cover (51), and a circulation fan (52) fixed inside the conveyor cover (51).

8. An oil-immersed transformer according to claim 7, characterized in that: The bottom of the conveying cover (51) is fixed with a connecting shell (53), and the bottom of the connecting shell (53) is fixed on a heat dissipation fin (4) on one side.

9. An oil-immersed transformer according to claim 1, characterized in that: An oil drain pipe (8) is provided on one side bottom of the oil tank (1) to connect to the inner cavity of the oil tank (1), and a reinforcing frame (14) is fixed on the side wall of the oil tank (1) and welded to the heat dissipation fins (4).

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