Oil-immersed transformer with circulating oil way heat dissipation structure

Abstract

The invention discloses an oil-immersed transformer with a circulating oil way heat dissipation structure, and relates to the technical field of oil-immersed transformers, the oil-immersed transformer comprises a shell, a coil, a shell cover and an insulator, the coil is installed in the shell, the shell cover is fixedly installed at the top end of the shell through screws, the insulator is fixed in the middle of the upper surface of the shell cover, and the shell cover is fixedly connected with the shell through screws. A first conveying pipe is fixed to the bottom end of the first storage tank, an oil way control valve is installed in the first conveying pipe, an oil pump is fixed to the bottom end of the first conveying pipe, a second conveying pipe is fixed to the output end of the oil pump, and a third conveying pipe is connected to the left end of the second conveying pipe. A control valve is fixed to the bottom end of the third conveying pipe. According to the oil-immersed transformer with the circulating oil way heat dissipation structure, the heat dissipation oil is circulated by means of dust-absorbing air, the working pressure of the oil pump is reduced, the cost is reduced, the temperature of the external heat dissipation oil is reduced through water cooling, and the heat dissipation effect of the transformer is improved.

Description

Technical Field

[0001] The invention relates to the technical field of oil-immersed transformers, and in particular to an oil-immersed transformer with a circulating oil circuit heat dissipation structure. Background Art

[0002] Oil-immersed transformers are used in power plants, substations, and various large industrial and civil facilities. They rely on oil as a cooling medium. They generally consist of a body and an oil tank. They have low manufacturing and maintenance costs and are easy to recycle. They are suitable for outdoor use and relatively harsh environments. In order to improve the heat dissipation effect, oil-immersed transformers with a circulating oil circuit heat dissipation structure are proposed on the market.

[0003] For example, a Chinese invention patent with the authorization announcement number CN113488313B discloses an oil-immersed transformer, including an oil-immersed transformer body, a convex rod, a plug plate, a heat dissipation mechanism and a second oil pump. The left side of the oil-immersed transformer body is snap-connected with a support frame, the heat dissipation mechanism is fixed on the front and rear sides of the heat-conducting frame, the inner bottom of the oil storage barrel is fixed with a first oil pump, the first connecting pipe runs through the right side of the oil storage barrel and is connected to the oil pipeline through a pipe clamp, the second oil pump is fixed to the left side of the inner bottom of the oil-immersed transformer body, the second connecting pipe runs through the left side of the oil-immersed transformer body and is connected to the return pipe through a pipe clamp. In the oil-immersed transformer, during the process of oil circulating in the oil-immersed transformer body and the oil storage barrel, the heat of the oil in the oil storage barrel can be successively transferred to the heat-conducting frame and the heat-conducting plate. At this time, the heat dissipation fan blows air towards the heat-conducting plate, so that the oil can be effectively cooled and cooled, thereby allowing the oil-immersed transformer body to be continuously cooled and cooled;

[0004] However, the existing oil-immersed transformer with a circulating oil circuit heat dissipation structure realizes the circulation of the heat dissipation oil through an oil pump, but the oil pump has always been used to realize the circulation of the heat dissipation oil, which increases the cost. Therefore, we propose an oil-immersed transformer with a circulating oil circuit heat dissipation structure to solve the above-mentioned problems. Summary of the invention

[0005] The object of the present invention is to provide an oil-immersed transformer with a circulating oil circuit heat dissipation structure to solve the problem that the existing oil-immersed transformer with a circulating oil circuit heat dissipation structure proposed in the above background technology realizes the circulation of heat dissipation oil through an oil pump, but the oil pump has always been used to realize the circulation of heat dissipation oil, which increases the cost.

[0006] To achieve the above object, the present invention provides the following technical solution: an oil-immersed transformer with a circulating oil circuit heat dissipation structure, comprising a housing, a coil, a housing cover and an insulator:

[0007] A coil is installed inside the shell, a shell cover is fixedly installed on the top of the shell by screws, and an insulator is fixed in the middle of the upper surface of the shell cover;

[0008] Mounting frames are fixed on both the left and right sides of the shell cover, a first storage tank is welded above the mounting frame on the left side of the upper surface of the shell cover, and a second storage tank is welded above the mounting frame on the right side of the upper surface of the shell cover, hollow tubes are fixed inside the first storage tank and the second storage tank, air bags are pasted on the outer side of the hollow tubes, tank covers are fixed on the tops of the first storage tank and the second storage tank, water pipes are fixed on the outer sides of the first storage tank and the second storage tank by heat dissipation glue, a first delivery pipe is fixed at the bottom end of the first storage tank, an oil circuit control valve is installed inside the first delivery pipe, an oil pump is fixed at the bottom end of the first delivery pipe, and a second delivery pipe is fixed at the output end of the oil pump, the The left end of the second delivery pipe is connected to the third delivery pipe, the bottom end of the third delivery pipe is fixed with an oil circuit control valve, the left end of the shell cover is fixed with a fourth delivery pipe, the top end of the first storage tank is connected to the fifth delivery pipe, the right end of the shell cover is fixed with a sixth delivery pipe, the bottom ends of the fourth and sixth delivery pipes are both fixed with an oil circuit control valve, the left end of the second storage tank is fixed with a seventh delivery pipe, a filter box is fixed between the fifth and fourth delivery pipes and between the sixth and seventh delivery pipes, a sealing groove is provided at the top of the filter box, a filter plate is provided inside the filter box, a sealing cover is fixed to the upper surface of the filter plate, and a sealing ring is fixed to the bottom end of the sealing cover;

[0009] The front, rear, left and right sides of the shell are all fixedly mounted with heat dissipation fins, and the outer side of the heat dissipation fins is provided with a dust cleaning mechanism, and the dust cleaning mechanism includes a protective cover, a motor, a screw and a dust cleaning plate. The left, right, front and rear sides of the shell are all fixed with protective covers, and the outer side of the protective cover is fixed with a motor, and the output end of the motor is fixed with a screw, and the outer end of the screw is threadedly connected to the top of the dust cleaning plate;

[0010] A dust suction box is fixed at the rear end of the upper surface of the shell cover, and an air pump is installed above the dust suction box. The output end of the air suction pump is fixed with a first air pipe, a second air pipe and a third air pipe from left to right in sequence. The front ends of the first storage tank and the second storage tank are both fixed with a release pipe. The left and right sides and the front end of the dust suction box are all fixed with dust suction pipes, and the bottom end of the dust suction pipe is fixed with a conical cover;

[0011] An eighth delivery pipe is fixed to the lower right end of the shell, and an oil circuit control valve is installed inside the eighth delivery pipe.

[0012] By adopting the above technical solution, the cooling oil is circulated with the help of dust-absorbing air, the working pressure of the oil pump is reduced, the cost is reduced, the temperature of the external cooling oil is reduced by water cooling, and the heat dissipation effect of the transformer is improved.

[0013] Preferably, the first air pipe and the third air pipe are both connected to the release pipe through a hollow tube.

[0014] Preferably, a third air pipe is fixed to the rear end of the first storage tank.

[0015] Preferably, a first air pipe is fixed to the rear end of the second storage tank.

[0016] Preferably, the sealing cover is fixedly connected to the filter box by screws.

[0017] Preferably, the top end of the cleaning plate fits with the inside of the protective cover, and the cleaning plate forms a sliding structure with the protective cover through a screw.

[0018] Preferably, a dust cleaning plate is attached to the outer side surface of the heat dissipation fin.

[0019] Preferably, air path control valves are installed inside the first air pipe, the second air pipe, the third air pipe and the release pipe.

[0020] Preferably, an air filtering structure is installed inside the dust suction box.

[0021] Compared with the prior art, the invention has the following beneficial effects: the oil-immersed transformer with a circulating oil circuit heat dissipation structure circulates the heat dissipation oil by means of dust-absorbing air, thereby reducing the working pressure of the oil pump and the cost; water cooling reduces the temperature of the external heat dissipation oil and improves the heat dissipation effect of the transformer;

[0022] 1. The dust on the heat sink fins is removed by a cleaning mechanism consisting of a protective cover, a motor, a screw and a cleaning plate to prevent the dust from affecting the heat dissipation effect of the heat sink fins;

[0023] The dust suction box and the vacuum pump are then used to absorb the dusty air, and the dust remains on the filter structure inside the dust suction box. Clean air expands the air bag through the first air pipe and the third air pipe, so that the cooling oil can circulate with the help of the dust-absorbed air, reducing the working pressure of the oil pump and reducing costs.

[0024] 2. When the cooling oil is circulating, filter the impurities through the filter plate inside the filter box, remove the screws between the filter box and the sealing cover, disassemble the sealing groove and the sealing ring, and take out the filter plate to facilitate cleaning of impurities;

[0025] 3. Water pipes are coiled around the outer sides of the first storage tank and the second storage tank, and the water inside the water pipes is used to quickly cool the cooling oil, thereby improving the heat dissipation effect of the transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the first axial side section structure of the present invention;

[0027] Figure 2This is a schematic diagram of the water pipe structure of the present invention;

[0028] Figure 3 It is a schematic diagram of the first axial side structure of the present invention;

[0029] Figure 4 It is a schematic diagram of the second axial side section structure of the present invention;

[0030] Figure 5 This is a schematic diagram of the structure of the dust cleaning mechanism of the present invention;

[0031] Figure 6 It is a schematic diagram of the second axial side structure of the present invention;

[0032] Figure 7 This is a schematic diagram of the connection structure between the sealing cover and the filter box of the present invention;

[0033] Figure 8 This is a schematic diagram of the cutaway connection structure of the first storage tank of the present invention.

[0034] In the figure: 1, shell; 2, coil; 3, shell cover; 4, insulator; 5, mounting frame; 6, first storage tank; 7, second storage tank; 8, hollow tube; 9, air bag; 10, tank cover; 11, water pipe; 12, first delivery pipe; 13, oil pump; 14, second delivery pipe; 15, third delivery pipe; 16, fourth delivery pipe; 17, fifth delivery pipe; 18, sixth delivery pipe; 19, seventh delivery pipe; 20, filter box; 21. Sealing groove; 22. Filter plate; 23. Sealing cover; 24. Sealing ring; 25. Cleaning mechanism; 2501. Protective cover; 2502. Motor; 2503. Screw; 2504. Cleaning plate; 26. Ash suction box; 27. Vacuum pump; 28. First air pipe; 29. ​​Second air pipe; 30. Third air pipe; 31. Release pipe; 32. Dust suction pipe; 33. Conical cover; 34. Eighth conveying pipe; 35. Heat dissipation fins. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Example 1: Please refer to Figure 1-Figure 8 The existing oil-immersed transformer with a circulating oil circuit heat dissipation structure realizes the circulation of the heat dissipation oil through the oil pump 13, but the oil pump 13 has been used to realize the circulation of the heat dissipation oil, which increases the cost. In order to solve this technical problem, this embodiment discloses the following technical content;

[0037] An oil-immersed transformer with a circulating oil circuit heat dissipation structure, wherein a coil 2 is installed inside a shell 1, a shell cover 3 is fixedly installed on the top of the shell 1 by screws, an insulator 4 is fixed in the middle of the upper surface of the shell cover 3, and the coil 2 is electrically connected to the insulator 4;

[0038] Mounting frames 5 are fixed on both the left and right sides of the shell cover 3, a first storage tank 6 is welded above the mounting frame 5 on the left side of the upper surface of the shell cover 3, and a second storage tank 7 is welded above the mounting frame 5 on the right side of the upper surface of the shell cover 3, a hollow tube 8 is fixed inside the first storage tank 6 and the second storage tank 7, an air bag 9 is pasted on the outer side of the hollow tube 8, and a tank cover 10 is fixed on the top of the first storage tank 6 and the second storage tank 7;

[0039] A first delivery pipe 12 is fixed to the bottom end of the first storage tank 6, a control valve is installed inside the first delivery pipe 12, an oil pump 13 is fixed to the bottom end of the first delivery pipe 12, and a second delivery pipe 14 is fixed to the output end of the oil pump 13, a third delivery pipe 15 is connected to the left end of the second delivery pipe 14, a control valve is fixed to the bottom end of the third delivery pipe 15, a fourth delivery pipe 16 is fixed to the left end of the shell cover 3, a fifth delivery pipe 17 is connected to the top end of the first storage tank 6, a sixth delivery pipe 18 is fixed to the right end of the shell cover 3, and control valves are fixed to the bottom ends of the fourth delivery pipe 16 and the sixth delivery pipe 18, a seventh delivery pipe 19 is fixed to the left end of the second storage tank 7, and a filter box 20 is fixed between the fifth delivery pipe 17 and the fourth delivery pipe 16 and between the sixth delivery pipe 18 and the seventh delivery pipe 19;

[0040] The front, rear, left and right sides of the housing 1 are all fixedly mounted with heat dissipation fins 35, and the outer side of the heat dissipation fins 35 is provided with a dust cleaning mechanism 25, which includes a protective cover 2501, a motor 2502, a screw 2503 and a dust cleaning plate 2504. The left, right, front and rear sides of the housing 1 are all fixed with protective covers 2501, and the outer side of the protective cover 2501 is fixed with a motor 2502, and the output end of the motor 2502 is fixed with a screw 2503, and the outer end of the screw 2503 is threadedly connected to the top of the dust cleaning plate 2504;

[0041] A dust suction box 26 is fixed to the rear end of the upper surface of the shell cover 3, and an air pump 27 is installed above the dust suction box 26. The output end of the air suction pump 27 is fixed with a first air pipe 28, a second air pipe 29 and a third air pipe 30 from left to right. The front ends of the first storage tank 6 and the second storage tank 7 are both fixed with a release pipe 31. The left and right sides and the front end of the dust suction box 26 are fixed with dust suction pipes 32, and the bottom end of the dust suction pipe 32 is fixed with a conical cover 33. The lower right end of the shell 1 is fixed with an eighth delivery pipe 34;

[0042] Heat dissipation oil is stored in the space formed by the shell 1 and the shell cover 3. The shell 1 and the shell cover 3 are connected by a sealing assembly to prevent oil leakage. Heat dissipation oil is stored in the first storage tank 6. Under the action of the oil pump 13, the heat dissipation oil in the first storage tank 6 is transported to the inside of the shell 1 through the first delivery pipe 12 and the second delivery pipe 14. The heat dissipation oil in the shell 1 enters the inside of the first storage tank 6 through the fourth delivery pipe 16, the fifth delivery pipe 17 and the filter box 20. The oil circuit control valves in the sixth delivery pipe 18 and the eighth delivery pipe 34 are closed, and the heat dissipation oil circulates in the space between the shell 1 and the shell cover 3.

[0043] The heat dissipation oil inside the housing 1 is dissipated through the heat dissipation fins 35. The heat dissipation fins 35 are stained with dust after long-term use. When the dust on the heat dissipation fins 35 needs to be cleaned, the motor 2502 inside the dust cleaning mechanism 25 is turned on, and the motor 2502 drives the screw 2503 to rotate clockwise and counterclockwise, so that the dust cleaning plate 2504 threadedly connected to the screw 2503 slides inside the protective cover 2501 to clean the dust on the heat dissipation fins 35.

[0044] While cleaning, the vacuum pump 27 is started. Under the action of the vacuum pump 27, the dusty air flows from the conical cover 33 and the dust suction pipe 32 to the inside of the dust suction box 26. After being filtered by the air filter structure inside the dust suction box 26, the clean air flows out. At this time, the oil pump 13 is closed, the air path control valve inside the third air pipe 30 is opened, the air path control valves inside the first air pipe 28 and the second air pipe 29 are closed, and the gas flows from the third air pipe 30 to the hollow pipe 8, and then flows from the hollow pipe 8 to the air bag 9, inflating the air bag 9, thereby squeezing out the heat dissipation oil inside the first storage tank 6, closing the control valve inside the first delivery pipe 12, and opening the control valve inside the third delivery pipe 15. Control valve, the heat dissipation oil flows from the third delivery pipe 15 to the second delivery pipe 14, and then flows to the housing 1. At this time, the control valve inside the fourth delivery pipe 16 is closed, and the control valve inside the sixth delivery pipe 18 is opened. The heat dissipation oil flows from the sixth delivery pipe 18, the seventh delivery pipe 19 and the filter box 20 to the second storage tank 7. Then, the control valve inside the first air pipe 28 is opened, and the gas flows from the first air pipe 28 to the hollow tube 8 and the air bag 9 inside the second storage tank 7. The heat dissipation oil inside the second storage tank 7 flows to the housing 1 again through the eighth delivery pipe 34, realizing the heat dissipation oil circulation. The control valve inside the release pipe 31 is opened to release the gas inside the air bag 9.

[0045] The gas used for dust collection is used to promote the circulation of cooling oil, saving energy and reducing costs;

[0046] Embodiment 2: The technical content disclosed in this embodiment is a further improvement on the above embodiment 1. The existing heat dissipation structure with a circulating oil circuit is not convenient for handling the filtering structure when filtering the heat dissipation oil. In order to further solve this technical problem, this embodiment discloses the following technical content, such as Figure 1 , Figure 3 and Figure 7 As shown;

[0047] A sealing groove 21 is provided at the top of the filter box 20, and a filter plate 22 is provided inside the filter box 20. A sealing cover 23 is fixed to the upper surface of the filter plate 22, and a sealing ring 24 is fixed to the bottom end of the sealing cover 23.

[0048] Remove the screws used to connect the filter box 20 and the sealing cover 23, then lift the sealing cover 23 to separate the sealing groove 21 from the sealing ring 24, and remove the filter plate 22 from the inside of the filter box 20. Dispose of the impurities on the filter plate 22. When the filter plate 22 is installed in the filter box 20, use the sealing groove 21 and the sealing ring 24 to prevent the leakage of the heat dissipation oil;

[0049] Embodiment 3: The technical content disclosed in this embodiment is a further improvement made on the basis of the above-mentioned embodiment 1. In the existing oil-immersed transformer with a circulating oil circuit heat dissipation structure, the heat dissipation speed of the heat dissipation oil needs to be improved when the heat dissipation oil is circulated. In order to further solve this technical problem, this embodiment discloses the following technical content, such as Figure 1-Figure 4 , Figure 6 and Figure 8 As shown;

[0050] A water pipe 11 is fixed to the outer side of the first storage tank 6 and the second storage tank 7 by heat dissipation adhesive, one end of the water pipe 11 is connected to the external cooling water delivery equipment, and the other end of the water pipe 11 is connected to the water receiving equipment. The cooling water flows inside the water pipe 11, and the heat dissipation oil inside the first storage tank 6 and the second storage tank 7 is quickly cooled by the coiled water pipe 11, thereby improving the heat dissipation effect;

[0051] The oil pump 13, the gas circuit control valve, the oil circuit control valve, the motor 2502 and the air pump 27 are all controlled by the controller, and the coil 2, the insulator 4, the oil pump 13, the motor 2502 and the air pump 27, the gas circuit control valve and the oil circuit control valve are all commonly used parts on the market;

[0052] The above completes a series of operations of the oil-immersed transformer with a circulating oil circuit heat dissipation structure. The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0053] The standard parts used in the present invention can all be purchased from the market, and special-shaped parts can be customized according to the instructions and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the prior art. Machinery, parts and equipment all adopt conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here.

[0054] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An oil-immersed transformer with a circulating oil circuit heat dissipation structure, comprising a housing (1), a coil (2), a housing cover (3) and an insulator (4), characterized in that: A coil (2) is installed inside the shell (1); a shell cover (3) is fixedly installed on the top of the shell (1) by means of screws; an insulator (4) is fixed in the middle of the upper surface of the shell cover (3); The left and right sides of the shell cover (3) are both fixed with mounting frames (5); a first storage tank (6) is welded above the mounting frame (5) on the left side of the upper surface of the shell cover (3); and a second storage tank (7) is welded above the mounting frame (5) on the right side of the upper surface of the shell cover (3); hollow tubes (8) are fixed inside the first storage tank (6) and the second storage tank (7); an air bag (9) is pasted on the outer side of the hollow tube (8); a tank cover (10) is fixed on the top of the first storage tank (6) and the second storage tank (7); a water pipe (11) is fixed to the outer side of the first storage tank (6) and the second storage tank (7) by heat dissipation glue; a first delivery pipe (12) is fixed at the bottom end of the first storage tank (6); an oil circuit control valve is installed inside the first delivery pipe (12); an oil pump (13) is fixed at the bottom end of the first delivery pipe (12); and a second delivery pipe (14) is fixed at the output end of the oil pump (13); and the second delivery pipe (14) is fixed at the output end of the second delivery pipe (14). The left end of the housing (4) is connected to a third delivery pipe (15), the bottom end of the third delivery pipe (15) is fixed with an oil circuit control valve, the left end of the housing cover (3) is fixed with a fourth delivery pipe (16), the top end of the first storage tank (6) is connected to a fifth delivery pipe (17), the right end of the housing cover (3) is fixed with a sixth delivery pipe (18), the bottom ends of the fourth delivery pipe (16) and the sixth delivery pipe (18) are both fixed with an oil circuit control valve, the left end of the second storage tank (7) is fixed with a fifth delivery pipe (17), the top end of the first storage tank (6) is connected to a sixth delivery pipe (18), the bottom ends of the fourth delivery pipe (16) and the sixth delivery pipe (18) are both fixed with an oil circuit control valve, and the left end of the second storage tank (7) is fixed with a fifth delivery pipe (17). A seventh delivery pipe (19) is fixed, a filter box (20) is fixed between the fifth delivery pipe (17) and the fourth delivery pipe (16) and between the sixth delivery pipe (18) and the seventh delivery pipe (19), a sealing groove (21) is provided at the top of the filter box (20), and a filter plate (22) is provided inside the filter box (20), a sealing cover (23) is fixed on the upper surface of the filter plate (22), and a sealing ring (24) is fixed at the bottom end of the sealing cover (23); The front, rear, left and right sides of the housing (1) are all fixedly mounted with heat dissipation fins (35); a dust cleaning mechanism (25) is arranged on the outside of the heat dissipation fins (35); the dust cleaning mechanism (25) comprises a protective cover (2501), a motor (2502), a screw (2503) and a dust cleaning plate (2504); the front, rear and left sides of the housing (1) are all fixedly mounted with protective covers (2501); the outer side of the protective cover (2501) is fixedly mounted with a motor (2502); the output end of the motor (2502) is fixedly mounted with a screw (2503); and the outer end of the screw (2503) is threadedly connected to the top end of the dust cleaning plate (2504); A dust suction box (26) is fixed at the rear end of the upper surface of the shell cover (3), and an air pump (27) is installed above the dust suction box (26). The output end of the air suction pump (27) is fixed with a first air pipe (28), a second air pipe (29) and a third air pipe (30) in sequence from left to right. The front ends of the first storage tank (6) and the second storage tank (7) are both fixed with a release pipe (31). The left and right sides and the front end of the dust suction box (26) are both fixed with dust suction pipes (32), and the bottom end of the dust suction pipe (32) is fixed with a conical cover (33); An eighth delivery pipe (34) is fixed to the lower right end of the housing (1), and an oil circuit control valve is installed inside the eighth delivery pipe (34).

2. The oil-immersed transformer with a circulating oil circuit heat dissipation structure according to claim 1, characterized in that: The first air pipe (28) and the third air pipe (30) are both connected to the release pipe (31) through the hollow pipe (8).

3. The oil-immersed transformer with a circulating oil circuit heat dissipation structure according to claim 1, characterized in that: A third air pipe (30) is fixed to the rear end of the first storage tank (6).

4. The oil-immersed transformer with a circulating oil circuit heat dissipation structure according to claim 1, characterized in that: A first air pipe (28) is fixed to the rear end of the second storage tank (7).

5. The oil-immersed transformer with a circulating oil circuit heat dissipation structure according to claim 1, characterized in that: The sealing cover (23) is fixedly connected to the filter box (20) by means of screws.

6. The oil-immersed transformer with a circulating oil circuit heat dissipation structure according to claim 1, characterized in that: The top end of the cleaning plate (2504) fits into the interior of the protective cover (2501), and the cleaning plate (2504) forms a sliding structure with the protective cover (2501) via a screw (2503).

7. The oil-immersed transformer with a circulating oil circuit heat dissipation structure according to claim 1, characterized in that: The outer side surface of the heat dissipation fin (35) is attached with a dust cleaning plate (2504).

8. The oil-immersed transformer with a circulating oil circuit heat dissipation structure according to claim 1, characterized in that: Air path control valves are installed inside the first air pipe (28), the second air pipe (29), the third air pipe (30) and the release pipe (31).

9. The oil-immersed transformer with a circulating oil circuit heat dissipation structure according to claim 1, characterized in that: An air filtering structure is installed inside the dust suction box (26).

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