Oil-immersed transformer with self-circulation heat dissipation structure

Abstract

The present application relates to transformer heat dissipation technical field, specifically to a kind of oil-immersed transformer with self-circulation heat dissipation structure, the side of transformer shell is fixedly connected with cabinet, the inside of cabinet is installed with circulating assembly, circulating assembly includes motor fixedly connected with the inner wall of cabinet, the output end of motor is fixedly connected with crank, the end of crank away from motor is rotatably connected with first sliding block;Through the reciprocating plunger pump structure of piston rod and sleeve being set, cooperate with the one-way valve in first pipeline and second pipeline, intermittent pulse flow is formed to oil liquid, pulse flow constantly destroys stable thermal boundary layer when flowing through winding oil channel, so that boundary layer cannot thicken, thereby substantially improve convective heat transfer coefficient, under the same average flow, the heat exchange efficiency of pulse jet is improved compared with traditional continuous flow, solve the problem that stable thermal boundary layer is formed in prior art by continuous oil flow, leading to low heat exchange efficiency.

Description

Technical Field

[0001] This invention relates to the field of transformer heat dissipation technology, and more specifically, to an oil-immersed transformer with a self-circulating heat dissipation structure. Background Technology

[0002] Oil-immersed transformers are key equipment in power systems. During operation, the losses generated by the windings and core are converted into heat, causing the temperature of the insulating oil to rise. In actual operation, the heating of the windings and core of oil-immersed transformers exhibits spatial non-uniformity and temporal abrupt changes. Spatially, hot spots often form at the winding ends, outgoing lines, and local magnetic flux-dense areas of the core, with temperatures much higher than the average oil temperature. Temporally, fluctuations in grid load, short-circuit impacts, or start-up and shutdown operations can cause the temperature to rise sharply within seconds.

[0003] The existing technology has the following shortcomings when in use: the cooling system adopts a continuous fixed displacement oil supply method, which cannot perform targeted enhanced cooling of hot spots. The continuous oil flow will quickly establish a stable thermal boundary layer in the narrow oil channel of the winding. The thermal resistance of this boundary layer accounts for more than half of the entire heat exchange process. Even if the oil pump flow rate is doubled, the boundary layer thickness is only slightly reduced. The increase in heat transfer coefficient has a seriously nonlinear relationship with the increase in pump power consumption. A large amount of electrical energy is converted into the internal energy of the oil and flow noise, rather than effective heat dissipation.

[0004] Therefore, an oil-immersed transformer with a self-circulating heat dissipation structure is needed to solve the above problems. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an oil-immersed transformer with a self-circulating heat dissipation structure, which can solve the problem of an oil-immersed transformer with a self-circulating heat dissipation structure.

[0006] To achieve the above objectives, the present invention provides the following technical solution: The application is as follows: An oil-immersed transformer with a self-circulating heat dissipation structure includes a transformer casing, a cabinet fixedly connected to one side of the transformer casing, and a circulation component installed inside the cabinet. The circulation assembly includes a motor fixedly connected to the inner wall of the cabinet. A crank is fixedly connected to the output end of the motor. A first slider is rotatably connected to the end of the crank away from the motor. A swing arm is abutted against the outer wall of the first slider. A first guide groove and a second guide groove are respectively opened on the inner wall of the swing arm along the length direction. A second slider is slidably connected to the inner wall of the second guide groove. A connecting block is rotatably connected to the inner wall of the second slider. A cylinder is fixedly connected to the bottom end of the connecting block. The outer wall of the cylinder is fixedly connected to the inner wall of the cabinet. The telescopic end of the cylinder is fixedly connected to the bottom end of the connecting block. A mounting block is rotatably connected to the end of the swing arm away from the cylinder. The outer wall of the mounting block is slidably connected to the inner wall of the cabinet. A piston rod is fixedly connected to one side of the mounting block.

[0007] As a preferred technical solution of this application, a sleeve is fitted on the outer wall of the piston rod, and the sleeve and the piston rod are slidably connected. A first pipe is connected to the top end of the sleeve on the side away from the mounting block, and a second pipe is connected to the bottom end of the sleeve on the side away from the mounting block.

[0008] As a preferred technical solution of this application, both the inner walls of the first pipe and the second pipe near the sleeve are rotatably connected to a one-way valve, and the end of the second pipe away from the sleeve is connected to the inner wall of the transformer casing.

[0009] As a preferred technical solution of this application, the end of the first pipe away from the sleeve is connected to a high-pressure tank, the top of the high-pressure tank is connected to a third pipe, and the end of the third pipe away from the high-pressure tank is connected to a hydraulic pump.

[0010] As a preferred technical solution of this application, a fourth pipe is connected to one side of the top of the hydraulic pump, a heat sink is connected to the end of the fourth pipe away from the hydraulic pump, and a fifth pipe is connected to the bottom of the heat sink.

[0011] As a preferred technical solution of this application, the end of the fifth pipe away from the heat sink is connected to the inner wall of the transformer casing, and the hydraulic pump is connected to the heat sink through the fourth pipe.

[0012] As a preferred technical solution of this application, the first guide groove opened on the swing arm extends along the length direction of the swing arm, and the first slider is slidably connected to the inner wall of the first guide groove.

[0013] As a preferred technical solution of this application, a sliding seal is formed between the inner wall of the sleeve and the outer wall of the piston rod, and an oil chamber is provided inside the side of the sleeve away from the mounting block, which is respectively connected to the first pipe and the second pipe.

[0014] As a preferred technical solution of this application, the telescopic end of the cylinder extends vertically upward and is fixedly connected to the bottom end of the connecting block. The sliding position of the second slider in the second guide groove is adjusted by the telescopic movement of the cylinder to change the swing amplitude of the swing arm.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. By using a reciprocating plunger pump structure consisting of a piston rod and a sleeve, and with the cooperation of one-way valves in the first and second pipes, the oil is converted into an intermittent pulse flow. As the pulse flow flows through the winding oil passage, it continuously disrupts the stable thermal boundary layer, preventing the boundary layer from thickening. This significantly improves the convective heat transfer coefficient. Under the same average flow rate, the heat transfer efficiency of the pulse jet is higher than that of the traditional continuous flow, solving the problem of low heat transfer efficiency caused by the formation of a stable thermal boundary layer in the existing technology.

[0016] 2. By using a cylinder, a second slider, and a second guide groove, the piston rod stroke can be infinitely adjusted. Increasing the stroke increases the single oil discharge volume and the circulation flow rate; decreasing the stroke decreases the oil discharge volume and the circulation flow rate. This enables online dynamic adjustment of cooling intensity, targeted and enhanced cooling of local hot spots, while avoiding over-cooling of low-temperature areas. This reduces the temperature difference between windings and suppresses insulation fatigue caused by thermal stress. It solves the problems in existing technologies where cooling intensity cannot be adjusted online according to real-time heat load and where targeted cooling of local hot spots is not possible. Attached Figure Description

[0017] Figure 1 This application provides an overall structural schematic diagram of an oil-immersed transformer with a self-circulating heat dissipation structure.

[0018] Figure 2 This application provides a schematic diagram of the overall structure of the internal circulation component of an oil-immersed transformer with a self-circulating heat dissipation structure.

[0019] Figure 3 This is a side view of the internal circulation component of an oil-immersed transformer with a self-circulating heat dissipation structure, provided for this application.

[0020] Figure 4 This application provides a schematic diagram of the sleeve structure of an oil-immersed transformer with a self-circulating heat dissipation structure.

[0021] Figure 5 A schematic diagram of the connection structure between the piston rod and the swing arm in an oil-immersed transformer with a self-circulating heat dissipation structure provided in this application; Figure 6 A schematic diagram of the connection structure between the swing arm and the sliding block in an oil-immersed transformer with a self-circulating heat dissipation structure provided in this application; Figure 7 A schematic diagram of the connection structure of the high-voltage tank in an oil-immersed transformer with a self-circulating heat dissipation structure provided in this application; Figure 8 This application provides an overall process diagram of an oil-immersed transformer with a self-circulating heat dissipation structure.

[0022] The image shows: 1. Transformer casing; 2. Cabinet; 3. Motor; 4. Crank; 5. First slider; 6. Swing arm; 7. First guide groove; 8. Second guide groove; 9. Second slider; 10. Connecting block; 11. Cylinder; 12. Mounting block; 13. Piston rod; 14. Sleeve; 15. First pipe; 16. Second pipe; 17. Check valve; 18. Third pipe; 19. Hydraulic pump; 20. Fourth pipe; 21. Heat sink; 22. Fifth pipe; 23. High-pressure tank. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments.

[0024] In the description of this invention, it should be noted that the terms "upper" and "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed when in use, or the orientation or positional relationship commonly understood by those skilled in the art. These terms 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. In addition, the terms "first" and "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] Example: like Figures 1 to 8 As shown, this embodiment proposes an oil-immersed transformer with a self-circulating heat dissipation structure, including a transformer housing 1, which is a sealed oil tank containing the transformer core, windings, and insulating oil. A cabinet 2 is fixedly connected to one side of the transformer housing 1 by welding or bolts. The cabinet 2 is an independent metal box used to install a circulation assembly. The circulation assembly includes a motor 3 fixedly connected to the inner wall of the cabinet 2 by a bracket. The output shaft of the motor 3 extends horizontally, and a crank 4 is fixedly connected to the output end of the motor 3 by a key. The crank 4 is a flat rod-shaped component with a shaft hole at one end that fits tightly with the output shaft of the motor 3. A first slider 5 is rotatably connected to the end of the crank 4 away from the motor 3 via a pin. The first slider 5 is a cuboid metal block with a through hole in its center for installing a rolling bearing, forming a rotating pair with the pin at the end of the crank 4. The outer wall of the first slider 5 is connected to a swing arm 6. Specifically, a first guide groove 7 is formed along the length direction of the swing arm 6, and the first slider 5 is embedded in the first guide groove 7. The two are in sliding contact, and the contact surface has a friction-reducing coating. The inner wall of the swing arm 6 is provided with a first guide groove 7 and a second guide groove 8 along the length direction. Both guide grooves are long strip-shaped through grooves and are parallel to each other. The inner wall of the second guide groove 8 is slidably connected to a second slider 9, which can slide freely in the second guide groove 8. The inner wall of the second slider 9 is rotatably connected to a connecting block 10 through a pin. The connecting block 10 is T-shaped and rotatably connected to the second slider 9. The bottom end of the connecting block 10 is fixedly connected to the telescopic end of a cylinder 11, which can be fixed by welding. The outer wall of the cylinder 11 is fixedly connected to the inner wall of the cabinet 2 through a mounting lug. The cylinder 11 is arranged vertically, and the bottom of the cylinder body is fixed to the cabinet 2. The telescopic end of the cylinder 11 is fixedly connected to the bottom end of the connecting block 10. When the cylinder 11 intakes or exhausts air, the telescopic end drives the connecting block 10 to move up and down, thereby changing the position of the second slider 9 in the second guide groove 8. The end of the swing arm 6 away from the cylinder 11, i.e. the free end of the swing arm 6, is rotatably connected to the mounting block 12 by a pin. The outer wall of the mounting block 12 is slidably connected to the inner wall of the cabinet 2. The inner wall of the cabinet 2 is provided with a horizontal slide rail, and the outer wall of the mounting block 12 is provided with a slide groove. The two work together to achieve horizontal reciprocating sliding. One side of the mounting block 12 is fixedly connected to the piston rod 13 by bolts. The crank 4 is driven to rotate by the motor 3. The crank 4 drives the first slider 5 to slide in the first guide groove 7 of the swing arm 6, forcing the swing arm 6 to swing back and forth around the second slider 9 as the fulcrum. By adjusting the position of the second slider 9 by the cylinder 11, the swing amplitude of the swing arm 6 can be changed steplessly, thereby adjusting the stroke of the piston rod 13 and realizing the on-demand adjustment of the cooling intensity.

[0026] like Figure 4 As shown, a sleeve 14 is fitted onto the outer wall of the piston rod 13. The sleeve 14 is a cylindrical component, closed at one end and with an opening at the other end for the piston rod 13 to extend into. The sleeve 14 and the piston rod 13 are slidably connected. Specifically, the inner wall of the sleeve 14 and the outer wall of the piston rod 13 are fitted with a clearance fit. An annular groove is formed on the inner wall of the sleeve 14, and a rubber sealing ring is installed in the groove to ensure that the oil does not leak from between the piston rod 13 and the sleeve 14 under high pressure. The outer side of the closed end of the sleeve 14 is provided with... Two pipe joints are provided, namely a top pipe joint and a bottom pipe joint. The top of the sleeve 14 away from the mounting block 12 is connected to a first pipe 15, which is a copper pipe. One end of the first pipe 15 is connected to the top pipe joint of the sleeve 14 through a threaded joint, and the other end is used to connect to the high pressure tank 23. The bottom of the sleeve 14 away from the mounting block 12 is connected to a second pipe 16, which is also a copper pipe. One end of the second pipe 16 is connected to the bottom pipe joint of the sleeve 14, and the other end is connected to the interior of the transformer housing 1. When the piston rod 13 moves to the left inside the sleeve 14, the volume of the working chamber inside the sleeve 14 increases, creating a negative pressure. The oil is then drawn into the sleeve 14 through the first pipe 15. When the piston rod 13 moves to the right, the volume of the working chamber decreases, the oil is pressurized, and it is pushed out through the second pipe 16 into the transformer housing 1. In this way, the reciprocating motion of the piston rod 13 realizes the intake and discharge of the oil, which is equivalent to a single-acting plunger pump. Compared with ordinary centrifugal oil pumps, this plunger pumping structure has higher discharge pressure and is less sensitive to oil viscosity. It can work reliably even when the transformer oil viscosity is very high at low temperatures, alleviating the shortcomings of traditional oil pumps that are difficult to start in cold regions. At the same time, since the sliding seal between the sleeve 14 and the piston rod 13 is located inside the cabinet 2 and there is no external rotating dynamic seal, the risk of oil leakage is avoided, improving the safety and environmental protection of the transformer.

[0027] like Figure 4 As shown, one-way valves 17 are rotatably connected to the inner walls of the first pipe 15 and the second pipe 16 near the sleeve 14. The one-way valve 17 in the first pipe 15 allows oil to flow from the first pipe 15 to the sleeve 14 and prevents reverse flow; the one-way valve 17 in the second pipe 16 allows oil to flow from the sleeve 14 to the second pipe 16 and prevents reverse flow. The end of the first pipe 15 away from the sleeve 14 is connected to the high-pressure tank 23, and the end of the second pipe 16 away from the sleeve 14 is connected to the inner wall of the transformer housing 1. The connection port is located at the upper part of the transformer housing 1 and can be set as needed. When the piston rod 13 moves to the left to draw in oil, the one-way valve 17 in the first pipe 15 opens and the one-way valve 17 in the second pipe 16 closes, and the oil flows from the high-pressure tank 23 into the sleeve 14 through the first pipe 15. When the piston rod 13 moves to the right to press in oil, the one-way valve 17 in the first pipe 15 closes and the one-way valve 17 in the second pipe 16 opens, and the oil flows from the sleeve 14 into the transformer casing 1 through the second pipe 16. Unlike the continuous oil supply of traditional centrifugal pumps, the oil flow generated by this scheme is an intermittent pulse flow. When the pulse flow flows through the internal oil passages of the transformer, it can continuously destroy the thermal boundary layer on the winding surface, making it impossible for the boundary layer to thicken steadily, thereby greatly improving the convective heat transfer coefficient. Under the same average flow rate, the heat transfer efficiency of the pulse jet is higher than that of the continuous flow, resulting in a stronger cooling effect under the same oil pump power consumption, especially with unique advantages in solving local hot spot problems.

[0028] like Figure 4As shown, the end of the first pipe 15 away from the sleeve 14 is connected to a high-pressure tank 23. The high-pressure tank 23 is a cylindrical pressure-resistant container. The oil outlet of the high-pressure tank 23 is located at the bottom and connected to the first pipe 15; its oil inlet is located at the top and connected to the third pipe 18. The top of the high-pressure tank 23 is connected to a third pipe 18, which is a high-pressure hose. One end of the third pipe 18 is connected to the inlet of the high-pressure tank 23, and the other end is connected to the oil outlet of the hydraulic pump 19. The end of the third pipe 18 away from the high-pressure tank 23 is connected to the hydraulic pump 19, which is installed inside the cabinet 2. In actual operation, the hydraulic pump 19 draws oil from the transformer shell 1, pressurizes the oil, and sends it into the high-pressure tank 23 through the third pipe 18, so that the high-pressure tank 23 stores high-pressure oil. When the piston rod 13 moves to the left to draw oil, the high-pressure oil in the high-pressure tank 23 is drawn into the sleeve 14 through the first pipe 15. The sleeve 14 then pushes it to the right and returns it to the transformer shell 1 through the second pipe 16. The high-pressure tank 23 plays the role of energy storage and pressure stabilization: when the transformer is lightly loaded, the hydraulic pump 19 works intermittently to fill the high-pressure tank 23 with oil and store pressure; when the transformer is heavily loaded and requires enhanced cooling, the high-pressure tank 23 releases the stored high-pressure oil, which, in conjunction with the reciprocating motion of the piston rod 13, achieves high-flow pulsed injection.

[0029] like Figure 3 As shown, a fourth pipe 20 is connected to one side of the top of the hydraulic pump 19. The fourth pipe 20 is a high-pressure oil pipe, one end of which is threaded to the oil inlet of the hydraulic pump 19, and the other end is connected to the oil outlet of the heat sink 21. The end of the fourth pipe 20 away from the hydraulic pump 19 is connected to the heat sink 21. The heat sink 21 is composed of multiple parallel aluminum alloy fins and built-in serpentine oil pipes. The oil pipes have an oil inlet and an oil outlet at both ends. The heat sink 21 is fixedly installed on the side of the cabinet 2, with the fins exposed to the outside air, and is cooled by forced airflow using an auxiliary fan. The bottom end of the heat sink 21 is connected to the fifth pipe 22, which is an oil inlet pipe. One end is connected to the oil inlet of the heat sink 21, and the other end is connected to the inner wall of the transformer shell 1. After the high-temperature oil flows out of the transformer shell 1, it enters the serpentine tube of the heat sink 21 through the fifth pipe 22. The heat is transferred to the fins through the tube wall and then carried away by the air, thus reducing the oil temperature. The cooled oil flows out from the oil outlet of the heat sink 21 through the fourth pipe 20 and enters the oil suction port of the hydraulic pump 19. The fin spacing and area of ​​the heat sink 21 are determined according to the rated capacity and heat load of the transformer.

[0030] like Figure 3 As shown, the end of the fifth pipe 22 away from the heat sink 21 is connected to the inner wall of the transformer housing 1. The specific connection port can be set at the lower part of the transformer housing 1 so that the high-temperature oil can preferentially enter the heat dissipation circuit. The hydraulic pump 19 is connected to the heat sink 21 through the fourth pipe 20. The power of the entire cycle comes from the piston rod 13 in the sleeve 14 driven by the motor 3 and the hydraulic pump 19, and the two work together.

[0031] like Figure 5 As shown, the telescopic end of the cylinder 11 extends vertically upward and is fixedly connected to the bottom end of the connecting block 10. The sliding position of the second slider 9 in the second guide groove 8 is adjusted by the telescopic movement of the cylinder 11 to change the swing amplitude of the swing arm 6. When the telescopic rod of the cylinder 11 extends, the connecting block 10 drives the second slider 9 to move upward in the second guide groove 8, with the fulcrum position closer to the free end. The swing amplitude of the swing arm 6 decreases, the stroke of the piston rod 13 decreases accordingly, and the amount of oil discharged by the sleeve 14 through the second pipe 16 per cycle decreases, thus reducing the circulation flow rate. Conversely, when the telescopic rod of the cylinder 11 retracts, the second slider 9 moves downward, with the fulcrum position closer to the hinge end. The swing amplitude increases, the stroke of the piston rod 13 increases, the amount of oil discharged increases, and the circulation flow rate increases. This achieves stepless adjustment of the oil flow rate. The adjustment process can be carried out online, so that the cylinder 11 moves to the corresponding position to match the required cooling intensity. Compared with the traditional variable frequency oil pump speed adjustment method, this solution changes the displacement through mechanical stroke adjustment. The motor 3 can always run at the optimal efficiency speed. Under low temperature and high viscosity conditions, stroke adjustment will not cause the motor 3 to overload, because the load torque will naturally decrease after the displacement is reduced.

[0032] The working principle of the above embodiment is as follows: The motor 3 is started, and the motor 3 drives the crank 4 to rotate. The crank 4 drives the first slider 5 to slide in the first guide groove 7 of the swing arm 6, which forces the swing arm 6 to swing back and forth around the second slider 9, thereby pushing the mounting block 12 and the piston rod 13 to perform horizontal reciprocating motion in the sleeve 14. At the same time, the cylinder 11 extends and retracts according to the working conditions to adjust the position of the second slider 9 in the second guide groove 8, thereby steplessly changing the swing amplitude of the swing arm 6 and realizing the online adjustment of the stroke of the piston rod 13.

[0033] During the oil suction stroke, the one-way valve 17 in the first pipe 15 is opened and the one-way valve 17 in the second pipe 16 is closed, and the high-pressure oil in the high-pressure tank 23 is sucked into the sleeve 14 through the first pipe 15; during the oil pressure stroke, the one-way valve 17 in the first pipe 15 is closed and the one-way valve 17 in the second pipe 16 is opened, and the oil is discharged into the transformer casing 1 through the second pipe 16.

[0034] Meanwhile, the high-temperature oil inside the transformer casing 1 enters the heat sink 21 for cooling through the fifth pipe 22. The cooled oil is then drawn into the hydraulic pump 19 through the fourth pipe 20. The hydraulic pump 19 pressurizes the oil and sends it to the high-pressure tank 23 for storage through the third pipe 18. The high-pressure tank 23 then supplies oil to the sleeve 14 through the first pipe 15, forming a complete closed-loop self-circulation. By adjusting the stroke of the piston rod 13, the amount of oil discharged by the sleeve 14 in each cycle can be controlled, realizing stepless adjustment of the cooling intensity as needed, thereby adapting to load changes and improving heat dissipation efficiency and reliability.

[0035] The above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described herein. Although the present invention has been described in detail with reference to the above embodiments, the present invention is not limited to the specific embodiments described above. Therefore, any modifications or equivalent substitutions to the present invention, as well as all technical solutions and improvements that do not depart from the spirit and scope of the invention, are covered within the scope of the claims of the present invention.

Claims

1. An oil-immersed transformer with a self-circulating heat dissipation structure, comprising a transformer casing (1), wherein a cabinet (2) is fixedly connected to one side of the transformer casing (1), characterized in that: The cabinet (2) is equipped with a circulation component inside; The circulation assembly includes a motor (3) fixedly connected to the inner wall of the cabinet (2). A crank (4) is fixedly connected to the output end of the motor (3). A first slider (5) is rotatably connected to the end of the crank (4) away from the motor (3). A swing arm (6) is abutted against the outer wall of the first slider (5). A first guide groove (7) and a second guide groove (8) are respectively opened on the inner wall of the swing arm (6) along the length direction. A second slider (9) is slidably connected to the inner wall of the second guide groove (8). A connecting block (10) is rotatably connected to the wall. A cylinder (11) is fixedly connected to the bottom end of the connecting block (10). The outer wall of the cylinder (11) is fixedly connected to the inner wall of the cabinet (2). The telescopic end of the cylinder (11) is fixedly connected to the bottom end of the connecting block (10). A mounting block (12) is rotatably connected to the end of the swing arm (6) away from the cylinder (11). The outer wall of the mounting block (12) is slidably connected to the inner wall of the cabinet (2). A piston rod (13) is fixedly connected to one side of the mounting block (12).

2. An oil-immersed transformer with a self-circulating heat dissipation structure according to claim 1, characterized in that, The piston rod (13) is fitted with a sleeve (14) on its outer wall. The sleeve (14) and the piston rod (13) are slidably connected. The top end of the sleeve (14) away from the mounting block (12) is connected to a first pipe (15), and the bottom end of the sleeve (14) away from the mounting block (12) is connected to a second pipe (16).

3. An oil-immersed transformer with a self-circulating heat dissipation structure according to claim 2, characterized in that, One-way valves (17) are rotatably connected to the inner walls of the first pipe (15) and the second pipe (16) near the sleeve (14). The end of the second pipe (16) away from the sleeve (14) is connected to the inner wall of the transformer casing (1).

4. An oil-immersed transformer with a self-circulating heat dissipation structure according to claim 2, characterized in that, The first pipe (15) is connected to a high-pressure tank (23) at the end away from the sleeve (14), and a third pipe (18) is connected to the top of the high-pressure tank (23). The third pipe (18) is connected to a hydraulic pump (19) at the end away from the high-pressure tank (23).

5. An oil-immersed transformer with a self-circulating heat dissipation structure according to claim 4, characterized in that, A fourth pipe (20) is connected to one side of the top of the hydraulic pump (19). A heat sink (21) is connected to the end of the fourth pipe (20) away from the hydraulic pump (19). A fifth pipe (22) is connected to the bottom of the heat sink (21).

6. An oil-immersed transformer with a self-circulating heat dissipation structure according to claim 5, characterized in that, The end of the fifth pipe (22) away from the heat sink (21) is connected to the inner wall of the transformer casing (1), and the hydraulic pump (19) is connected to the heat sink (21) through the fourth pipe (20).

7. An oil-immersed transformer with a self-circulating heat dissipation structure according to claim 1, characterized in that, The first guide groove (7) opened on the swing arm (6) extends along the length direction of the swing arm (6), and the first slider (5) is slidably connected to the inner wall of the first guide groove (7).

8. An oil-immersed transformer with a self-circulating heat dissipation structure according to claim 1, characterized in that, The telescopic end of the cylinder (11) extends vertically upward and is fixedly connected to the bottom end of the connecting block (10). The sliding position of the second slider (9) in the second guide groove (8) is adjusted by the telescopic movement of the cylinder (11) to change the swing amplitude of the swing arm (6).

9. An oil-immersed transformer with a self-circulating heat dissipation structure according to claim 2, characterized in that, A sliding seal is formed between the inner wall of the sleeve (14) and the outer wall of the piston rod (13). The sleeve (14) has an oil chamber on the side away from the mounting block (12) that is connected to the first pipe (15) and the second pipe (16) respectively.

10. An oil-immersed transformer with a self-circulating heat dissipation structure according to claim 1, characterized in that, The first guide groove (7) on the swing arm (6) is located on the left side of the swing arm (6), and the second guide groove (8) is located on the right side of the swing arm (6). The first slider (5) is slidably disposed in the first guide groove (7), and the second slider (9) is slidably disposed in the second guide groove (8).

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