An oil-immersed transformer

Abstract

The present application relates to the technical field of transformer, specifically, relates to an oil-immersed transformer, including outer oil shell, the inside of outer oil shell is provided with transformer winding, and the upper end of outer oil shell is provided with a plurality of insulators, one side of outer oil shell is connected with balance oil pillow, and balance oil pillow and the inside of outer oil shell are provided with cooling oil, and are communicated with each other by pipeline, the lower side of outer oil shell is communicated with high-temperature oil box, and the outside of high-temperature oil box is provided with low-temperature oil box, a composite cooling system of water cooling and air cooling is adopted, wherein the cooling oil absorbing heat will first enter low-temperature oil box and carry out preliminary cooling, then enter the air cooling part of two sides symmetrically arranged and carry out secondary air cooling, finally backflow to outer oil shell and carry out circulating cooling to transformer winding, and the cooling water for cooling cooling oil will also enter heat dissipation part and carry out air cooling heat dissipation, so that the circulation of two kinds of cooling medium and the superposition of two kinds of cooling mode are used to improve the overall heat dissipation efficiency and reliability.

Description

Technical Field

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

[0002] Currently, traditional oil-immersed transformers generally use a single oil-cooling or air-cooling method for heat dissipation. In actual operation, due to transformer load fluctuations and changes in ambient temperature, the heat generated by the windings can easily cause the cooling oil temperature to rise too high, resulting in limited heat dissipation efficiency and making it difficult to meet the long-term stable operation requirements of high power density transformers.

[0003] In view of this, we propose a transformer structure with multiple cooling mechanisms and optimized heat exchange paths to solve the above-mentioned technical problems. Summary of the Invention

[0004] The purpose of this invention is to provide an oil-immersed transformer to solve the problem mentioned in the background art of traditional oil-immersed transformers, which use a single heat dissipation method and have low heat dissipation efficiency.

[0005] To achieve the above objectives, the present invention provides an oil-immersed transformer, including an outer oil shell, inside which a transformer winding is disposed, and multiple insulators are disposed at the upper end of the outer oil shell. A balance oil tank is connected to one side of the outer oil shell, and both the balance oil tank and the outer oil shell are provided with cooling oil and are interconnected by pipes. A high-temperature oil box is connected to the lower side of the outer oil shell, and a low-temperature oil box is disposed outside the high-temperature oil box. A cooling section for cooling the oil is disposed between the high-temperature oil box and the low-temperature oil box. A heat dissipation section fixed to the side wall of the outer oil shell is connected to the outside of the cooling section. Two air-cooling sections are symmetrically connected to the side of the low-temperature oil box and the outer oil shell.

[0006] As a preferred embodiment of the present invention, the lower end of the outer oil casing is connected to a first suction pump, and the upper end of the first suction pump extends into the interior of the lower end of the outer oil casing and is located on the lower side of the transformer winding. A suction port is provided at the center of the upper end of the first suction pump, and a flow guide baffle is connected to the inner wall of the lower end of the first suction pump. The flow guide baffle has gaps with the side and the inner wall of the lower end of the first suction pump.

[0007] As a preferred embodiment of the present invention, the lower end of the first suction pump is connected to a second suction pump, and the high-temperature oil box is connected to the lower end of the second suction pump. The lower end of the high-temperature oil box is fixed with a suction motor by bolts, and a linkage shaft runs through the interior of the first suction pump, the second suction pump, and the high-temperature oil box.

[0008] As a preferred embodiment of the present invention, the suction motor is connected to the lower end of the linkage shaft via an output shaft and is electrically connected to an external power supply via a wiring harness. The upper end of the linkage shaft is connected to a centrifugal fan blade located between the first suction pump and the guide baffle, and the centrifugal fan blade is rotatably connected between the first suction pump and the guide baffle. Multiple axial flow fan blades located inside the second suction pump are connected to the outside of the linkage shaft.

[0009] As a preferred embodiment of the present invention, the cooling section includes heat sinks, and a plurality of connecting rods are connected between the low-temperature oil box and the high-temperature oil box, and a plurality of heat sinks are arranged between the plurality of connecting rods and connecting the low-temperature oil box and the high-temperature oil box, and the plurality of heat sinks are arranged in a tree-like pattern from the high-temperature oil box to the low-temperature oil box.

[0010] As a preferred embodiment of the present invention, water-cooled covers are provided at both the upper and lower ends of the low-temperature oil box and the high-temperature oil box, and a sealing element is provided between the water-cooled covers and the water-cooled covers. Multiple liquid guiding branches are connected to the outside of both water-cooled covers, and both water-cooled covers are connected to distribution pipes through multiple liquid guiding branches.

[0011] As a preferred embodiment of the present invention, both of the distribution pipes are connected to a connecting pipe, and one of the connecting pipes is connected to a first circulation pipe, which is connected to a port on one side of the heat dissipation part. A circulating water pump is provided between the connecting pipe and the first circulation pipe.

[0012] As a preferred embodiment of the present invention, the connecting pipe on the other side is connected to a second circulation pipe through a threaded sleeve. The second circulation pipe is connected to the other port of the heat dissipation part, and a heat dissipation fan is provided on the side of the heat dissipation part near the outer oil shell. The heat dissipation fan is fixed on the side wall of the outer oil shell and electrically connected to an external power supply through a wiring harness.

[0013] As a preferred embodiment of the present invention, a connecting seat is provided at the connection between the low-temperature oil box and the two air-cooling sections, and a connecting head is connected to the inner side of the upper and lower ends of the air-cooling section. An oil return port is provided at the connection between the outer oil shell and the two air-cooling sections. The air-cooling section is connected to the connecting seat and the oil return port through two connecting heads and bolts respectively, and a sealing element is provided between the air-cooling section and the connecting seat and the oil return port.

[0014] As a preferred embodiment of the present invention, the heat dissipation part is connected to end tubes at both the upper and lower ends, and is connected to the first circulation tube and the second circulation tube through the two end tubes. Two frame rods located on both sides of the heat dissipation part are connected between the two end tubes. The heat dissipation part is connected to the outside of the outer oil shell through the two end tubes and bolts, and is located on the side of the cooling fan away from the outer oil shell.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0016] 1. This invention employs a composite cooling system that combines water cooling and air cooling. The cooling oil that has absorbed heat first enters the cooling section for initial cooling, then enters the air cooling sections symmetrically arranged on both sides for secondary air cooling, and finally flows back to the outer oil tank to circulate and cool the transformer windings. At the same time, the cooling water that cools the cooling oil also enters the heat dissipation section for air cooling. Thus, through the circulation of the two cooling media and the superposition of the two cooling methods, the overall heat dissipation efficiency and reliability are improved.

[0017] 2. This invention is equipped with a centrifugal pump and an axial flow pump driven by the same suction motor. The first suction pump draws in the cooling oil from the outer oil tank, guides it through the baffle plate to the second suction pump, and then pushes the oil into the high-temperature oil box by the axial flow fan blades. Finally, it is sent to the cooling section for water cooling and then introduced into the low-temperature oil box through the water cooling section. The cooling oil increases the pressure in the high-temperature oil box through the simultaneous operation of the two pumps, ensuring that the cooling oil circulates efficiently and stably in the oil circuit.

[0018] 3. In this invention, multiple heat dissipation fins are arranged in a tree shape between the low-temperature oil box and the high-temperature oil box. When the cooling oil flows from the high-temperature oil box to the low-temperature oil box, the number of flow channels increases, thereby increasing the heat exchange area with the cooling water and improving the heat dissipation area. This results in a high-efficiency drop in the temperature of the cooling oil, improving the cooling speed and effect of the cooling oil.

[0019] 4. The upper and lower ends of the water-cooled cavity of the present invention are connected to the distribution pipe and the connecting pipe through the water-cooled cover and the liquid guide branch pipe. Then, it is connected to the two ends of the heat dissipation part through the first circulation pipe and the second circulation pipe to form a closed cooling water circulation loop. The cooling water is driven by the circulating water pump to circulate between the water-cooled cavity and the heat dissipation part. The cooling water is then cooled by the cooling fan outside the heat dissipation part to maintain the continuous and stable circulation heat dissipation. Attached Figure Description

[0020] Figure 1 This is a three-dimensional schematic diagram of the transformer of the present invention;

[0021] Figure 2 This is a three-dimensional cross-sectional view of the transformer of the present invention;

[0022] Figure 3 This is a schematic diagram of the transformer explosion according to the present invention;

[0023] Figure 4 This is a schematic diagram of the outer oil tank connection of the present invention;

[0024] Figure 5 This is a schematic diagram of the connection of the first suction pump of the present invention;

[0025] Figure 6 This is a schematic diagram of the water-cooling section connection of the present invention;

[0026] Figure 7 This is a schematic diagram of the linkage shaft connection of the present invention;

[0027] Figure 8 This is an exploded schematic diagram of the water-cooling section of the present invention;

[0028] Figure 9 This is a schematic diagram of the heat sink connection of the present invention;

[0029] Figure 10 This is a schematic diagram of the heat dissipation part connection of the present invention.

[0030] The meanings of the labels in the diagram are as follows:

[0031] 1. Outer oil casing; 2. Insulator; 3. Balancing oil conservator; 4. Low-temperature oil box; 5. Air-cooled section; 6. Heat dissipation section; 7. First suction pump; 8. Suction port; 9. Flow guide baffle; 10. Second suction pump; 11. High-temperature oil box; 12. Suction motor; 13. Linkage shaft; 14. Centrifugal fan blade; 15. Axial fan blade; 16. Connecting rod; 17. Heat sink; 18. Water-cooled cover; 19. Liquid guide branch pipe; 20. Distribution pipe; 21. Connecting pipe; 22. First circulation pipe; 23. Circulating water pump; 24. Second circulation pipe; 25. Cooling fan; 26. Connecting seat; 27. Connector; 28. Oil return port; 29. ​​End pipe; 30. Frame rod. Detailed Implementation

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0034] Please see Figure 1-10As shown, this embodiment provides an oil-immersed transformer, including an outer oil shell 1. A transformer winding is installed inside the outer oil shell 1, and multiple insulators 2 are installed at the upper end of the outer oil shell 1. A connecting bracket is installed at the lower end of the outer oil shell 1. A balance oil tank 3 is connected to one side of the outer oil shell 1, and both the balance oil tank 3 and the outer oil shell 1 contain cooling oil, which is interconnected via pipes. A high-temperature oil box 11 is connected to the lower side of the outer oil shell 1, and a low-temperature oil box 4 is installed outside the high-temperature oil box 11. A cooling section for cooling the oil is provided between the high-temperature oil box 11 and the low-temperature oil box 4. A heat dissipation section 6 fixed to the side wall of the outer oil shell 1 is connected to the outside of the cooling section. Two air-cooling sections 5 are symmetrically connected to the side of the low-temperature oil box 4 and the outer oil shell 1. During transformer operation, the outer oil shell 1 is installed and fixed via the connecting bracket, and the transformer winding inside the outer oil shell 1 is electrically connected to the external circuit via multiple insulators 2 at the upper end, and is cooled by the cooling oil inside the outer oil shell 1, ensuring stable operation of the transformer winding.

[0035] The cooling oil can circulate inside the outer oil shell 1, high temperature oil box 11, low temperature oil box 4 and air cooling section 5 to absorb the heat generated during the operation of the transformer winding, and is cooled by the water cooling section. At the same time, it can balance the liquid level changes caused by temperature inside the outer oil shell 1 through the balance oil pillow 3.

[0036] At this time, cooling water circulates between the water-cooled section and the heat dissipation section 6. The cooling oil that has absorbed the heat of the transformer winding is introduced into the low-temperature oil box 4 through the high-temperature oil box 11. During the introduction process, the cooling oil is cooled by the cooling water flowing inside the cooling section. After being cooled by the water, the cooling oil enters the air-cooled section 5, which is symmetrically arranged on both sides, for air cooling. Finally, it flows back into the outer oil shell 1 to circulate and cool the transformer winding. At the same time, the cooling water that cools the cooling oil enters the heat dissipation section 6 for air cooling and heat dissipation. After heat dissipation, it circulates back into the water-cooled section to circulate and cool the cooling oil.

[0037] like Figures 2-7As shown, the lower end of the outer oil casing 1 is connected to a first suction pump 7, and the upper end of the first suction pump 7 extends into the lower end of the outer oil casing 1 and is located below the transformer winding. A suction port 8 is provided at the center of the upper end of the first suction pump 7, and a flow guide baffle 9 is connected to the inner wall of the lower end of the first suction pump 7. The flow guide baffle 9 has gaps with the side and the inner wall of the lower end of the first suction pump 7. The lower end of the first suction pump 7 is connected to a second suction pump 10, and a high-temperature oil box 11 is connected to the lower end of the second suction pump 10. A suction motor 12 is fixed to the lower end of the high-temperature oil box 11 by bolts. A linkage shaft 13 runs through the first suction pump 7, the second suction pump 10, and the high-temperature oil box 11, and the suction motor 12 is connected to the lower end of the linkage shaft 13 through an output shaft. The linkage shaft 13 is electrically connected to an external power source via a wiring harness. A seal is provided between the lower end of the linkage shaft 13 and the high-temperature oil box 11. The upper end of the linkage shaft 13 is connected to a centrifugal fan blade 14 located between the first suction pump 7 and the guide baffle 9. The centrifugal fan blade 14 is rotatably connected between the first suction pump 7 and the guide baffle 9. Multiple axial flow fan blades 15 located inside the second suction pump 10 are connected to the outside of the linkage shaft 13. During the process of cooling oil entering the low-temperature oil box 4, the suction motor 12 is started. The output shaft of the suction motor 12 is engaged with the insertion slot at the lower end of the linkage shaft 13 through a connector. The suction motor 12 drives the linkage shaft 13 to rotate, and through the linkage shaft 13, drives the centrifugal fan blade 14 and multiple axial flow fan blades 15 to rotate.

[0038] At this time, since the centrifugal fan blade 14 can form a centrifugal pump with the first suction pump 7 and the guide baffle 9, and the second suction pump 10 can form an axial flow pump with the linkage shaft 13 and the axial flow fan blade 15, the suction motor 12 can drive the centrifugal pump and the axial flow pump to run at the same time. The centrifugal pump can suck the cooling oil inside the outer oil shell 1 through the suction port 8 opened at the upper end of the first suction pump 7, and then guide it into the second suction pump 10 through the gap between the guide baffle 9 and the first suction pump 7. At the same time, the cooling oil entering the second suction pump 10 can be pushed downward by multiple rotating axial flow fan blades 15 inside the axial flow pump, and the cooling oil is introduced into the high temperature oil box 11 under high pressure. The high temperature oil box 11 then introduces the cooling oil into the low temperature oil box 4 through the water cooling section, and water cooling is performed in this process. Finally, the low temperature oil box 4 introduces the water-cooled cooling oil into the air cooling section 5 for air cooling, and guides it back into the outer oil shell 1 for circulation, thereby realizing the cyclic cooling of the transformer winding.

[0039] The cooling oil is introduced into the high-temperature oil box 11 under high pressure, allowing the cooling oil to flow efficiently through the water-cooling section and into the low-temperature oil box 4, thus achieving efficient circulation of the cooling oil within the outer oil shell 1, the high-temperature oil box 11, the low-temperature oil box 4, and the air-cooling section 5.

[0040] In addition, a connecting slot is provided at the upper end of the high-temperature oil box 11, and the lower end of the second suction pump 10 is engaged inside the connecting slot, and a sealing element is provided between the pump and the connecting slot.

[0041] like Figures 8-10 As shown, the cooling section includes heat sinks 17. Multiple connecting rods 16 connect the low-temperature oil box 4 and the high-temperature oil box 11, and multiple heat sinks 17 are arranged between the connecting rods 16, connecting the low-temperature oil box 4 and the high-temperature oil box 11. The heat sinks 17 are arranged in a tree-like pattern, radiating from the high-temperature oil box 11 towards the low-temperature oil box 4. Water-cooled covers 18 are provided at both the upper and lower ends of the low-temperature oil box 4 and the high-temperature oil box 11, and sealing elements are provided between the water-cooled covers 18 and the covers. Multiple liquid guiding pipes 19 are connected to the outside of both water-cooled covers 18. The two water-cooled covers 18 are located outside the second suction pump 10 and the suction motor 12, respectively. Both water-cooled covers 18 are connected to distribution pipes 2 through the multiple liquid guiding pipes 19. 0, and both distribution pipes 20 are connected to the outside of the connecting pipe 21. The outside of the connecting pipe 21 on one side is connected to the first circulation pipe 22, and the first circulation pipe 22 is connected to one side port of the heat dissipation part 6. A circulating water pump 23 is provided between the connecting pipe 21 and the first circulation pipe 22. The connecting pipe 21 on the other side is connected to the second circulation pipe 24 through a threaded sleeve. The second circulation pipe 24 is connected to the other side port of the heat dissipation part 6. A cooling fan 25 is provided on the side of the heat dissipation part 6 near the outer oil shell 1. The cooling fan 25 is fixed on the side wall of the outer oil shell 1 and is electrically connected to the external power supply through a wiring harness. During the water cooling process of the cooling oil, the high temperature oil box 11 guides the cooling oil drawn into the interior of the low temperature oil box 4 through multiple heat sinks 17.

[0042] At this time, the upper and lower ends of the low-temperature oil box 4 and the high-temperature oil box 11 are sealed by the water-cooled cover 18 to form a sealed water-cooled cavity, and multiple heat sinks 17 are located inside the water-cooled cavity. The upper and lower ends of the water-cooled cavity are connected to the upper and lower distribution pipes 20 and connecting pipes 21 through multiple liquid guide branches 19 on the upper and lower sides, respectively. Then, they are connected to the first circulation pipe 22 and the second circulation pipe 24 through two connecting pipes 21, respectively. A circulating water pump 23 is set between the connecting pipe 21 and the first circulation pipe 22. Finally, the first circulation pipe 22 and the second circulation pipe 24 are connected to the two ends of the heat dissipation part 6, respectively, so that the upper and lower ends of the water-cooled cavity are connected to the two ports of the heat dissipation part 6, so that the cooling water can circulate between the water-cooled cavity and the heat dissipation part 6 through the drive of the circulating water pump 23, and flow outside the multiple heat sinks 17.

[0043] Therefore, when the cooling oil flows inside the multiple heat sinks 17, the cooling water flowing inside the cooling chamber flows past the outside of the multiple heat sinks 17 and exchanges heat with the cooling oil flowing inside the multiple heat sinks 17, thereby cooling the cooling oil and reducing its temperature.

[0044] Furthermore, the radiator fan 25 is started, and the cooling water that has absorbed the heat of the cooling oil enters the heat dissipation section 6 under the drive of the circulating water pump 23. The radiator fan 25 runs and generates cooling air that blows towards the heat dissipation section 6, which exchanges heat with the cooling water inside the heat dissipation section 6 to cool down the cooling water inside the heat dissipation section 6, ensuring that the cooling water flowing back into the water cooling cavity can continuously cool down the cooling oil.

[0045] In addition, since the heat sink 17 is arranged in a tree-like pattern from the high-temperature oil box 11 to the low-temperature oil box 4, the flow channels of the cooling oil will increase as the cooling oil flows through the interior of the heat sink 17. This allows the cooling oil to increase its heat exchange area with the cooling water through the tree-like heat sink 17, thereby increasing the heat dissipation area of ​​the cooling oil, improving the cooling efficiency of the cooling oil, and further improving the cooling efficiency and stability of the transformer winding.

[0046] like Figure 3 and Figure 4 As shown, a connecting seat 26 is provided at the connection between the low-temperature oil box 4 and the two air-cooled sections 5. Connectors 27 are connected to the inner sides of the upper and lower ends of the air-cooled section 5. An oil return port 28 is provided at the connection between the outer oil shell 1 and the two air-cooled sections 5. The air-cooled section 5 is connected to the connecting seat 26 and the oil return port 28 through the two connectors 27 and bolts, respectively. A sealing element is provided between the air-cooled section 5 and the connecting seat 26 and the oil return port 28. The air-cooled section 5 is connected and sealed to the low-temperature oil box 4 through the lower connector 27 and the connecting seat 26, and the air-cooled section 5 is connected and sealed to the outer oil shell 1 through the upper connector 27 and the oil return port 28. This makes it easier to install and disassemble the air-cooled section 5 and to maintain the transformer.

[0047] like Figure 10 As shown, the heat dissipation section 6 has end tubes 29 connected to both the upper and lower ends, and is connected to the first circulation pipe 22 and the second circulation pipe 24 through the two end tubes 29. Two frame rods 30 located on both sides of the heat dissipation section 6 are connected between the two end tubes 29. The heat dissipation section 6 is connected to the outside of the outer oil shell 1 through the two end tubes 29 and bolts, and is located on the side of the cooling fan 25 away from the outer oil shell 1. The heat dissipation section 6 is composed of multiple heat dissipation fins that run vertically through each other, and are interconnected through the end tubes 29 at the upper and lower ends. The two end tubes 29 are connected and limited by the frame rods 30 on both sides to prevent the multiple heat dissipation sections 6 in the middle from deforming, and at the same time to fix the multiple heat dissipation sections 6.

[0048] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An oil-immersed transformer, comprising an outer oil casing (1), wherein a transformer winding is disposed inside the outer oil casing (1), and a plurality of insulators (2) are disposed at the upper end of the outer oil casing (1), a balance oil tank (3) is connected to one side of the outer oil casing (1), and both the balance oil tank (3) and the outer oil casing (1) are provided with cooling oil and are interconnected by pipes, characterized in that: The lower side of the outer oil shell (1) is connected to a high temperature oil box (11), and a low temperature oil box (4) is provided on the outside of the high temperature oil box (11). A cooling part for cooling oil is provided between the high temperature oil box (11) and the low temperature oil box (4). A heat dissipation part (6) fixed on the side wall of the outer oil shell (1) is connected to the outside of the cooling part. Two air cooling parts (5) are symmetrically connected to the side of the low temperature oil box (4) and the outer oil shell (1).

2. The oil-immersed transformer according to claim 1, characterized in that: The lower end of the outer oil shell (1) is connected to a first suction pump (7), and the upper end of the first suction pump (7) extends to the interior of the lower end of the outer oil shell (1) and is located on the lower side of the transformer winding. A suction port (8) is provided at the center of the upper end of the first suction pump (7), and a flow guide baffle (9) is connected to the inner wall of the lower end of the first suction pump (7). The flow guide baffle (9) has gaps with the side and the inner wall of the lower end of the first suction pump (7).

3. An oil-immersed transformer according to claim 2, characterized in that: The lower end of the first suction pump (7) is connected to the second suction pump (10), and the high temperature oil box (11) is connected to the lower end of the second suction pump (10). The lower end of the high temperature oil box (11) is fixed with a suction motor (12) by bolts. The first suction pump (7), the second suction pump (10) and the high temperature oil box (11) are connected by a linkage shaft (13).

4. An oil-immersed transformer according to claim 3, characterized in that: The suction motor (12) is connected to the lower end of the linkage shaft (13) via the output shaft and is electrically connected to an external power supply via a wiring harness. The upper end of the linkage shaft (13) is connected to a centrifugal fan blade (14) located between the first suction pump (7) and the guide baffle (9), and the centrifugal fan blade (14) is rotatably connected between the first suction pump (7) and the guide baffle (9). Multiple axial flow fan blades (15) located inside the second suction pump (10) are connected to the outside of the linkage shaft (13).

5. An oil-immersed transformer according to claim 1, characterized in that: The cooling section includes heat sinks (17), and multiple connecting rods (16) connect the low-temperature oil box (4) and the high-temperature oil box (11). Multiple heat sinks (17) are arranged between the multiple connecting rods (16) and the high-temperature oil box (11). The multiple heat sinks (17) are arranged in a tree-like pattern from the high-temperature oil box (11) to the low-temperature oil box (4).

6. An oil-immersed transformer according to claim 5, characterized in that: Water-cooled caps (18) are provided at both the upper and lower ends of the low-temperature oil box (4) and the high-temperature oil box (11), and a sealing element is provided between them. Multiple liquid guiding branches (19) are connected to the outside of the two water-cooled caps (18), and the two water-cooled caps (18) are connected to a distribution pipe (20) through multiple liquid guiding branches (19).

7. An oil-immersed transformer according to claim 6, characterized in that: Both of the distribution pipes (20) are connected to a connecting pipe (21) on the outside. One of the connecting pipes (21) is connected to a first circulation pipe (22) on the outside. The first circulation pipe (22) is connected to a port on one side of the heat dissipation part (6). A circulating water pump (23) is provided between the connecting pipe (21) and the first circulation pipe (22).

8. An oil-immersed transformer according to claim 7, characterized in that: The connecting pipe (21) on the other side is connected to the second circulation pipe (24) through a threaded sleeve. The second circulation pipe (24) is connected to the other port of the heat dissipation part (6). A heat dissipation fan (25) is provided on the side of the heat dissipation part (6) near the outer oil shell (1). The heat dissipation fan (25) is fixed on the side wall of the outer oil shell (1) and is electrically connected to an external power supply through a wire harness.

9. An oil-immersed transformer according to claim 1, characterized in that: The low-temperature oil box (4) is provided with a connecting seat (26) at the connection point with the two air-cooling parts (5). The air-cooling parts (5) are connected to the inner sides of the upper and lower ends with connectors (27). The outer oil shell (1) is provided with an oil return port (28) at the connection point with the two air-cooling parts (5). The air-cooling part (5) is connected to the connecting seat (26) and the oil return port (28) through the two connectors (27) and bolts respectively, and a sealing element is provided between the air-cooling part (5) and the connecting seat (26) and the oil return port (28).

10. An oil-immersed transformer according to claim 8, characterized in that: The heat dissipation part (6) is connected to end pipes (29) at both the top and bottom ends, and is connected to the first circulation pipe (22) and the second circulation pipe (24) through the two end pipes (29). There are two frame rods (30) on both sides of the heat dissipation part (6) between the two end pipes (29). The heat dissipation part (6) is connected to the outside of the outer oil shell (1) through the two end pipes (29) and bolts, and is located on the side of the heat dissipation fan (25) away from the outer oil shell (1).

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