Transformer oil purification structure of oil-immersed transformer

Abstract

The transformer oil purification structure of the oil-immersed transformer comprises an anti-explosion cabinet body, a transformer main body and transformer oil tanks, the transformer oil tanks are installed on the two sides of the transformer main body, and the transformer main body is installed in the anti-explosion cabinet body. According to the system, efficient purification of oil liquid is achieved through the intelligent graded filtration and automatic pressure relief technology, meanwhile, automatic collection of impurities is achieved through negative pressure suction and high-pressure airflow scouring, an oil liquid recovery structure is arranged to reduce waste, high-pressure gas generated in the purification process is innovatively utilized by the system to drive the micro turbine generator to conduct energy recovery, and the energy recovery efficiency is improved. Deep purification of waste gas is achieved through the activated carbon adsorption layer, the energy-saving and environment-friendly characteristics are achieved, the whole system integrates anti-explosion safety design and a modular maintenance structure, the maintenance cost is greatly reduced while the operation reliability is ensured, the system can be widely applied to the fields of electric power, industry and the like, and automation, high efficiency and recycling of the transformer oil purification process are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of transformers, and more specifically, to a pressure-transforming oil purification structure for an oil-immersed transformer. Background Art

[0002] In the power system, the oil-immersed transformer is a core device, and the performance of its insulating oil (transformer oil) directly affects the operation safety and life of the transformer. Traditional transformer oil purification methods mainly adopt filter element filtration or centrifugal separation technology; However, conventional filter elements are prone to blockage and need to be replaced frequently. Centrifugal equipment often cannot operate fully automatically, and impurity cleaning requires shutdown operations, which affects the continuous power supply of the transformer. Moreover, water and gas are easily mixed into the oil during the operation of the transformer. The traditional system lacks an intelligent pressure relief mechanism, resulting in accelerated deterioration of the oil quality. At the same time, the filtered impurities are usually discarded mixed with waste oil without effective separation and recovery, and the high-pressure gas generated during the purification process is directly discharged, and the energy is not utilized. Therefore, professionals in this field have provided a pressure-transforming oil purification structure for an oil-immersed transformer to solve the above-mentioned problems. Summary of the Invention

[0003] Aiming at the problems existing in the prior art, the purpose of the present invention is to provide a pressure-transforming oil purification structure for an oil-immersed transformer.

[0004] To solve the above background art problems, the present invention adopts the following technical solutions; A pressure-transforming oil purification structure for an oil-immersed transformer, including an explosion-proof cabinet body, a transformer main body and a transformer oil tank. The transformer oil tank is installed on both sides of the transformer main body, the transformer main body is installed inside the explosion-proof cabinet body, and a collection tank, a coarse filtration component, a fine filtration component and a pressure relief component are arranged inside the explosion-proof cabinet body. An exhaust pipe is installed at the top of the collection tank, an oil outlet pipe is connected to the transformer oil tank, the other end of the oil outlet pipe is communicated with the coarse filtration component, a return oil pipe is fixedly installed on the other side of the transformer oil tank, and the return oil pipe is communicated with the pressure relief component. A fuel pump and a Venturi tube are installed inside the explosion-proof cabinet body. The coarse filtration component, the fine filtration component and the collection tank are all connected through the Venturi tube, and the fuel pump is communicated with the pressure relief component and the fine filtration component through a pipeline; The coarse filtration component includes a coarse filtration box fixedly installed on the inner wall of the explosion-proof cabinet body. A circular groove is opened inside the coarse filtration box. A flipping motor is fixedly installed on the front of the coarse filtration box. The output shaft of the flipping motor penetrates and extends into the circular groove. Two coarse filter meshes and a sealing plate are fixedly installed on the output shaft of the flipping motor. The top coarse filter mesh and the sealing plates on both sides are slidably sealed with the inner wall of the circular groove. A coarse slag discharge cavity is opened inside the coarse filtration box; The fine filter assembly includes a fine filter box, which is installed on the inner wall of the explosion-proof cabinet, and a conical separator is rotatably installed on the inner wall of the fine filter box. A driving motor is installed on the top of the fine filter box, and the output shaft of the driving motor is connected to the conical separator through a gear. A conveying pipe is fixedly installed on the coarse filter box, and the other end of the conveying pipe passes through the top of the fine filter box and extends to the inside of the conical separator. A fine slag discharge chamber is opened inside the fine filter box, and a conical valve is installed at the bottom of the conical separator. The bottom end of the conical valve is located inside the fine slag discharge chamber and is rotatably sealed with the inner wall of the fine slag discharge chamber. The pressure relief assembly includes a pressure relief box, which is installed on the inner wall of the explosion-proof cabinet, a mounting ring is installed on the inner wall of the pressure relief box, and evenly distributed oil-water separation membranes are installed on the inner wall of the mounting ring. The oil return pipe is installed in the pressure relief box and is located at the bottom of the oil-water separation membrane, and the pipeline connecting the oil pump and the pressure relief box is located at the top of the oil-water separation membrane. A high-pressure box connected to the interior of the pressure relief box is fixedly installed on the pressure relief box, and a high-pressure pipe is installed on the air pump on the high-pressure box, and the high-pressure pipe passes through and extends to the interior of the fine slag discharge chamber.

[0005] As a further description of the above technical solution: a processor is integrated inside the explosion-proof cabinet, and the coarse filter component, fine filter component and pressure relief component are all connected to the processor signal.

[0006] As a further description of the above technical solution: an air pressure sensor is integrated inside the high-pressure box, a one-way valve is installed on the high-pressure pipe, and both the one-way valve and the air pressure sensor are connected to the processor signal.

[0007] As a further description of the above technical solution: a micro-turbine generator is installed on the inner wall of the explosion-proof cabinet, and one end of the exhaust pipe away from the collection tank is connected to the air inlet of the micro-turbine generator.

[0008] As a further description of the above technical solution: an electric heating pipe is installed on the outside of the delivery pipe, and the electric heating pipe is connected to the processor signal.

[0009] As a further description of the above technical solution: a purification box is fixedly installed on the top of the collection tank, an activated carbon adsorption plate is installed inside the purification box, and the exhaust pipe is installed on the purification box.

[0010] As a further description of the above technical solution: both the oil outlet pipe and the oil return pipe are installed with electric control valves, and the electric control valves are connected to the processor signal.

[0011] As a further description of the above technical solution: The inside of the coarse slag discharge chamber is connected to the upstream inlet of the Venturi tube through a flexible hose, and the fine slag discharge chamber is connected to the downstream outlet of the Venturi tube through a rigid pipe. Valves are installed on both the flexible hose and the rigid pipe.

[0012] Compared with the prior art, the advantages of the present invention are as follows: In the present invention, efficient purification of oil fluid is achieved through intelligent grading filtration and automatic pressure relief technology. At the same time, negative pressure suction and high-pressure air flow scouring are adopted to realize automatic collection of impurities, and an oil fluid recovery structure is equipped to reduce waste. The system innovatively utilizes the high-pressure gas generated during the purification process to drive a micro-turbine generator for energy recovery, and deep purification of waste gas is achieved through an activated carbon adsorption layer, with both energy conservation and environmental protection characteristics. The entire system integrates an explosion-proof safety design and a modular maintenance structure, which greatly reduces the maintenance cost while ensuring the operation reliability, and can be widely applied to fields such as electric power and industry, realizing the automation, high efficiency, and resource utilization of the transformer oil purification process. Brief Description of the Drawings

[0013] Figure 1 It is a three-dimensional structural schematic diagram of the transformer body of the present invention; Figure 2 It is a three-dimensional structural schematic diagram of the explosion-proof cabinet body of the present invention; Figure 3 It is a top-view structural schematic diagram of the transformer body of the present invention; Figure 4 It is a cross-sectional structural schematic diagram of the coarse filtration box of the present invention; Figure 5 It is a cross-sectional structural schematic diagram of the fine filtration box of the present invention; Figure 6 It is a cross-sectional structural schematic diagram of the pressure relief box of the present invention; Figure 7 It is a three-dimensional structural schematic diagram inside the purification box of the present invention; Figure 8 It is a schematic diagram of the principle of the present invention.

[0014] Explanation of the reference numerals in the drawings: 1. Explosion-proof cabinet; 2. Transformer main body; 3. Transformer oil tank; 4. Collection tank; 5. Coarse filtration component; 501. Coarse filtration box; 502. Circular groove; 503. Tipping motor; 504. Coarse filter screen; 505. Sealing plate; 506. Coarse slag discharge chamber; 6. Fine filtration component; 601. Fine filtration box; 602. Conical separator; 603. Driving motor; 604. Fine slag discharge chamber; 605. Conical valve; 7. Pressure relief component; 701. Pressure relief box; 702. Mounting ring; 703. Oil-water separation membrane; 704. High-pressure box; 8. Exhaust pipe; 9. Oil outlet pipe; 10. Return pipe; 11. Oil pump; 12. Venturi tube; 13. Delivery pipe; 14. High-pressure pipe; 15. Processor; 16. Pressure sensor; 17. Check valve; 18. Micro-turbine generator; 19. Electric heating pipe; 20. Purification box; 21. Activated carbon adsorption plate; 22. Electric control valve. Specific embodiments

[0015] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention; Please refer to Figure 1-8 , in the present invention, a transformer oil purification structure of an oil-immersed transformer includes an explosion-proof cabinet 1, a transformer main body 2 and a transformer oil tank 3. The transformer oil tank 3 is installed on both sides of the transformer main body 2, and the transformer main body 2 is installed inside the explosion-proof cabinet 1. A collection tank 4, a coarse filtration component 5, a fine filtration component 6 and a pressure relief component 7 are arranged inside the explosion-proof cabinet 1. An exhaust pipe 8 is installed on the top of the collection tank 4. An oil outlet pipe 9 is connected to the transformer oil tank 3, and the other end of the oil outlet pipe 9 is communicated with the coarse filtration component 5. A return pipe 10 is fixedly installed on the other side of the transformer oil tank 3, and the return pipe 10 is communicated with the pressure relief component 7. An oil pump 11 and a Venturi tube 12 are installed inside the explosion-proof cabinet 1. The coarse filtration component 5, the fine filtration component 6 and the collection tank 4 are all connected through the Venturi tube 12, and the oil pump 11 is communicated with the pressure relief component 7 and the fine filtration component 6 through a pipeline.

[0016] The coarse filtration component 5 includes a coarse filtration box 501. The coarse filtration box 501 is fixedly installed on the inner wall of the explosion-proof cabinet 1. A circular groove 502 is opened inside the coarse filtration box 501. A tipping motor 503 is fixedly installed on the front of the coarse filtration box 501. The output shaft of the tipping motor 503 penetrates and extends into the circular groove 502. Two coarse filter screens 504 and a sealing plate 505 are fixedly installed on the output shaft of the tipping motor 503. The top coarse filter screen 504 and the sealing plates 505 on both sides are all slidably sealed with the inner wall of the circular groove 502. A coarse slag discharge chamber 506 is opened inside the coarse filtration box 501.

[0017] The fine filtration component 6 includes a fine filtration tank 601, which is installed on the inner wall of the explosion-proof cabinet 1. A conical separator 602 is rotatably installed on the inner wall of the fine filtration tank 601. A driving motor 603 is installed on the top of the fine filtration tank 601. The output shaft of the driving motor 603 is in transmission connection with the conical separator 602 through a gear. A conveying pipe 13 is fixedly installed on the coarse filtration tank 501. The other end of the conveying pipe 13 penetrates through the top of the fine filtration tank 601 and extends into the interior of the conical separator 602. A fine slag discharge chamber 604 is formed inside the fine filtration tank 601. A conical valve 605 is installed at the bottom of the conical separator 602. The bottom end of the conical valve 605 is located inside the fine slag discharge chamber 604 and is rotationally sealed with the inner wall of the fine slag discharge chamber 604.

[0018] The pressure relief component 7 includes a pressure relief tank 701, which is installed on the inner wall of the explosion-proof cabinet 1. An installation ring 702 is installed on the inner wall of the pressure relief tank 701. Uniformly distributed oil-water separation membranes 703 are installed on the inner wall of the installation ring 702. The return oil pipe 10 is installed inside the pressure relief tank 701 and is located at the bottom of the oil-water separation membranes 703. The pipe connecting the oil pump 11 to the pressure relief tank 701 is located at the top of the oil-water separation membranes 703. A high-pressure tank 704 communicating with the inside of the pressure relief tank 701 is fixedly installed on the pressure relief tank 701. A high-pressure pipe 14 is installed on the air pump on the high-pressure tank 704. The high-pressure pipe 14 penetrates and extends into the interior of the fine slag discharge chamber 604.

[0019] A processor 15 is integrated inside the explosion-proof cabinet 1. The coarse filtration component 5, the fine filtration component 6 and the pressure relief component 7 are all in signal connection with the processor 15; a pressure sensor 16 is integrated inside the high-pressure tank 704. A one-way valve 17 is installed on the high-pressure pipe 14. Both the one-way valve 17 and the pressure sensor 16 are in signal connection with the processor 15; an electric heating pipe 19 is installed on the outer side of the conveying pipe 13. The electric heating pipe 19 is in signal connection with the processor 15; electric control valves 22 are installed on both the oil outlet pipe 9 and the return oil pipe 10. The electric control valves 22 are in signal connection with the processor 15.

[0020] The inside of the coarse slag discharge chamber 506 is connected to the upstream inlet of the Venturi tube 12 through a hose. The fine slag discharge chamber 604 is connected to the downstream outlet of the Venturi tube 12 through a hard pipe. Valves are installed on both the hose and the hard pipe.

[0021] Among them, the collection tank 4 is used to collect impurities and part of the incoming variable pressure oil, which can be separated and recycled later. Some conventional valves in the above document are not described in detail.

[0022] After the transformer in the transformer oil tank 3 of the transformer main body 2 has been used for a period of time, the transformer oil contains more impurities and is under high voltage. When the transformer oil needs to be purified, the processor 15 controls the entire purification system to start working. First, the electric control valve 22 on the oil outlet pipe 9 and the liquid extraction pump 11 in the explosion-proof cabinet 1 are opened, and the transformer oil flows from the transformer oil tank 3 into the coarse filter tank 501. Subsequently, the large-particle impurities in the transformer oil are blocked by the coarse filter screen 504 at the top. Then, the transformer oil penetrates and moves through the delivery pipe 13 connected in the circular groove 502 towards the inside of the fine filter assembly 6.

[0023] When the oil enters the fine filter tank 601, the drive motor 603 is driving the conical separator 602 to rotate at high speed. Before entering, the electric heating tube 19 heats the oil in the delivery pipe 13 to reduce its viscosity to improve the filtration efficiency. The oil enters the inside of the rotating conical separator 602 from the outlet of the delivery pipe 13. Under the action of a strong centrifugal force, the fine impurities are thrown towards the inner wall of the separator and slide down along the wall surface to accumulate. At this time, the conical valve 605 is in the closed state to ensure that the separation process is not interfered. The purified oil is pumped out through the pipe on the liquid extraction pump 11 and enters the subsequent treatment process.

[0024] The purified oil enters the pressure relief tank 701 through the pipe and penetrates downward under the action of gravity, passing through the oil-water separation membrane 703. The oil-water separation membrane 703 effectively blocks the residual moisture and gas, enabling the purified oil to continue flowing downward. Subsequently, it is pumped back into the oil tank interior by the pump on the return pipe 10. At the same time, the separated high-pressure gas cannot penetrate the oil-water separation membrane 703 and continuously accumulates at the top of the pressure relief tank 701. The air pressure sensor 16 continuously monitors the gas pressure. When the pressure approaches the set threshold, the processor 15 controls the flipping motor 503 to drive the two groups of coarse filter screens 504 and the sealing plate 505 to rotate in the circular groove 502. When the sealing plate 505 rotates half a circle, the large-particle impurities intercepted on the coarse filter screen 504 are scraped into the interior of the coarse slag discharge chamber 506, and at the same time, a small amount of oil enters the waiting subsequent treatment together with the impurities.

[0025] When the air pressure sensor 16 detects that the pressure reaches the set threshold, the processor 15 starts the slag discharge program. The high-pressure gas stored in the high-pressure tank 704 is quickly sprayed into the fine slag discharge chamber 604 through the high-pressure pipe 14. The powerful airflow impact loosens the impurities deposited at the bottom of the chamber. At the same time, the processor 15 controls the conical valve 605 to open. At the moment of opening, under the action of the centrifugal force, the impurities are driven by the airflow through the hard pipe into the Venturi tube 12, and together with the high-pressure airflow from the high-pressure pipe 14, they enter the interior of the Venturi tube 12. The impurities in the coarse slag discharge chamber 506 are also sucked into the Venturi tube 12 through the hose under the negative pressure. All the impurities are finally sent into the collection tank 4 to complete the entire purification process. The purified transformer oil then flows back into the transformer oil tank 3 through the return pipe 10 to ensure the normal operation of the transformer.

[0026] In the present invention, a two-stage filtration design of a coarse filtration component 5 and a fine filtration component 6 is adopted. The coarse filter screen 504 can intercept large particle impurities above 100 μm. The conical separator 602 can effectively separate fine particles above 10 μm under a high-speed rotation of 3000 rpm. This hierarchical treatment enables the cleanliness of the oil to reach the NAS6 standard, and the filtration efficiency is increased by more than 60% compared with the traditional single-stage system. The intelligent temperature control of the electric heating tube 19 further enhances the filtration effect by reducing the viscosity of the oil.

[0027] Through the linkage control of the air pressure sensor 16 and the processor 15, the system realizes the complete automation of the slag discharge process. When the pressure threshold of 0.8 MPa is detected, the compressed air in the high-pressure tank 704 and the Venturi tube 12 are started synchronously, and the impurities in the coarse filtration component 5 and the fine filtration component 6 can be quickly removed. The unique conical valve 605 design automatically opens and closes under the action of centrifugal force to ensure that the normal oil flow is not disturbed when the impurities are discharged.

[0028] The PTFE material of the oil-water separation membrane 703 can block 99% of the accumulation of combustible gases. Combined with the directional pressure relief of the exhaust pipe 8, the system can still operate safely when the transformer is under pressure, fully meeting the explosion-proof standard while realizing the effective utilization and recycling of resources and reducing energy consumption.

[0029] The Venturi tube 12 efficiently transports the impurities and the carried oil to the collection tank 4, and the recycled transformer oil can be realized through subsequent static settlement. Compared with the traditional filter element type purification equipment, this system reduces the replacement of consumables and has a lower operating cost per ton of oil.

[0030] Please refer to Figure 3 , in which: a micro-turbine generator 18 is installed on the inner wall of the explosion-proof cabinet 1, and one end of the exhaust pipe 8 far from the collection tank 4 is connected to the air inlet of the micro-turbine generator 18.

[0031] In the present invention, the micro-turbine generator 18 is installed on the inner wall of the explosion-proof cabinet 1, and uses the high-pressure gas discharged during the purification process to drive the turbine to generate electricity, realizing energy recovery, providing auxiliary power to reduce the overall energy consumption, and improving the energy utilization rate.

[0032] Please refer to Figure 3 And 7 , in which: a purification box 20 is fixedly installed on the top of the collection tank 4, an activated carbon adsorption plate 21 is installed inside the purification box 20, and the exhaust pipe 8 is installed on the purification box 20.

[0033] In the present invention, the purification tank 20 is installed on the top of the collection tank 4. Inside, there is an activated carbon adsorption plate 21, which can efficiently adsorb oil mist, volatile organic compounds and trace harmful gases in the exhaust gas, ensuring that the emissions meet environmental protection standards. This design is particularly suitable for enclosed substations or places with high air quality requirements, avoiding the environmental pollution problems caused by the direct emission of waste gas by traditional oil purification systems.

[0034] The above are only the preferred specific embodiments of the present invention; however, the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its improved concept, making equivalent substitutions or changes, should be covered by the protection scope of the present invention.

Claims

1. A transformer oil purification structure for an oil-immersed transformer, comprising an explosion-proof cabinet (1), a transformer body (2) and a transformer oil tank (3), wherein the transformer oil tank (3) is mounted on both sides of the transformer body (2), and the transformer body (2) is mounted inside the explosion-proof cabinet (1), characterized in that: The explosion-proof cabinet (1) is provided with a collecting tank (4), a coarse filter assembly (5), a fine filter assembly (6) and a pressure relief assembly (7); an exhaust pipe (8) is installed on the top of the collecting tank (4); an oil outlet pipe (9) is connected to the transformer oil tank (3); the other end of the oil outlet pipe (9) is communicated with the coarse filter assembly (5); an oil return pipe (10) is fixedly installed on the transformer oil tank (3) on the other side; the oil return pipe (10) is communicated with the pressure relief assembly (7); an oil pump (11) and a venturi tube (12) are installed inside the explosion-proof cabinet (1); the coarse filter assembly (5), the fine filter assembly (6) and the collecting tank (4) are all connected via the venturi tube (12); the oil pump (11) is communicated with the pressure relief assembly (7) and the fine filter assembly (6) via a pipeline; The coarse filtering assembly (5) comprises a coarse filtering box (501), the coarse filtering box (501) is fixedly mounted on the inner wall of the explosion-proof cabinet (1), a circular groove (502) is provided inside the coarse filtering box (501), a turning motor (503) is fixedly mounted on the front of the coarse filtering box (501), the output shaft of the turning motor (503) penetrates and extends into the inside of the circular groove (502), two coarse filtering screens (504) and a sealing plate (505) are fixedly mounted on the output shaft of the turning motor (503), the coarse filtering screen (504) on the top and the sealing plates (505) on both sides are slidably sealed with the inner wall of the circular groove (502), and a coarse slag discharge cavity (506) is provided inside the coarse filtering box (501); The fine filter assembly (6) comprises a fine filter box (601), the fine filter box (601) being mounted on the inner wall of the explosion-proof cabinet (1), a conical separator (602) being rotatably mounted on the inner wall of the fine filter box (601), a driving motor (603) being mounted on the top of the fine filter box (601), an output shaft of the driving motor (603) being transmission-connected to the conical separator (602) via a gear, a conveying pipe (13) being fixedly mounted on the coarse filter box (501), the other end of the conveying pipe (13) passing through the top of the fine filter box (601) and extending to the inside of the conical separator (602), a fine slag discharge chamber (604) being provided inside the fine filter box (601), a conical valve (605) being mounted at the bottom of the conical separator (602), the bottom end of the conical valve (605) being located inside the fine slag discharge chamber (604) and being rotatably sealed with the inner wall of the fine slag discharge chamber (604); The pressure relief assembly (7) comprises a pressure relief box (701), the pressure relief box (701) being mounted on the inner wall of the explosion-proof cabinet (1), a mounting ring (702) being mounted on the inner wall of the pressure relief box (701), and evenly distributed oil-water separation membranes (703) being mounted on the inner wall of the mounting ring (702), the oil return pipe (10) being mounted in the pressure relief box (701) and being located at the bottom of the oil-water separation membrane (703), the pipeline connecting the oil pump (11) and the pressure relief box (701) being located at the top of the oil-water separation membrane (703), a high-pressure box (704) being fixedly mounted on the pressure relief box (701) and being in communication with the interior thereof, a high-pressure pipe (14) being mounted on the air pump on the high-pressure box (704), and the high-pressure pipe (14) penetrating and extending to the interior of the fine slag discharge chamber (604).

2. The transformer oil purification structure of an oil-immersed transformer according to claim 1, characterized in that: A processor (15) is integrated inside the explosion-proof cabinet (1), and the coarse filter component (5), the fine filter component (6) and the pressure relief component (7) are all connected to the processor (15) by signal.

3. The transformer oil purification structure of an oil-immersed transformer according to claim 1 is characterized in that: An air pressure sensor (16) is integrated inside the high-pressure box (704), a one-way valve (17) is installed on the high-pressure pipe (14), and both the one-way valve (17) and the air pressure sensor (16) are connected to the processor (15) for signal transmission.

4. The transformer oil purification structure of an oil-immersed transformer according to claim 1, characterized in that: A micro-turbine generator (18) is mounted on the inner wall of the explosion-proof cabinet (1), and one end of the exhaust pipe (8) away from the collection tank (4) is connected to the air inlet of the micro-turbine generator (18).

5. The transformer oil purification structure of an oil-immersed transformer according to claim 1, characterized in that: An electric heating pipe (19) is installed on the outer side of the delivery pipe (13), and the electric heating pipe (19) is connected to the processor (15) by signal.

6. The transformer oil purification structure of an oil-immersed transformer according to claim 1, characterized in that: A purification box (20) is fixedly mounted on the top of the collection tank (4), an activated carbon adsorption plate (21) is mounted inside the purification box (20), and the exhaust pipe (8) is mounted on the purification box (20).

7. The transformer oil purification structure of an oil-immersed transformer according to claim 1, characterized in that: The oil outlet pipe (9) and the oil return pipe (10) are both installed with an electric control valve (22), and the electric control valve (22) is connected to the processor (15) by signal.

8. The transformer oil purification structure of an oil-immersed transformer according to claim 1, characterized in that: The interior of the coarse slag discharge chamber (506) is connected to the upstream inlet of the Venturi tube (12) via a hose, and the fine slag discharge chamber (604) is connected to the downstream outlet of the Venturi tube (12) via a hard pipe, and valves are installed on both the hose and the hard pipe.

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