Oil-immersed transformer with circulating heat dissipation

Abstract

The application discloses a circulating heat dissipation oil-immersed transformer and relates to the technical field of transformer heat dissipation. The circulating heat dissipation oil-immersed transformer comprises a base, a transformer shell fixed to the base, a circulating pipe arranged outside the transformer shell and connected to upper and lower ends of the transformer shell, and a heat dissipation assembly arranged outside the transformer shell and comprising a first heat dissipation member fixed to one side of the transformer shell and a second heat dissipation member slidably mounted on the first heat dissipation member. The first heat dissipation member and the second heat dissipation member can slide relative to each other, so that the heat dissipation assembly has the ability of dynamically adjusting the physical form. When expanded, the heat dissipation assembly increases the heat dissipation surface area and forms an efficient ventilation flow channel, thereby rapidly dissipating the accumulated or continuously generated heat to the air, greatly improving the forced convection heat dissipation efficiency. When contracted, the heat dissipation assembly increases the contact heat conduction area with the internal circulating pipe, strengthens the heat absorption and heat storage capacity, and reduces unnecessary convection heat dissipation.

Description

Technical Field

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

[0002] Oil-immersed transformers, as core equipment in power systems, are widely used in power transmission and distribution, new energy power generation, and industrial fields. Their core function is to achieve voltage conversion through the principle of electromagnetic induction, while relying on insulating oil for heat dissipation and insulation protection. To ensure the long-term stable operation of oil-immersed transformers, plate-type heat sinks need to be installed on both sides of the long side of the transformer body using flange connections or other similar connection methods. The plate-type heat sinks and the heat-conducting oil inside the oil-immersed transformer form a circulating cooling loop, which cools the iron core inside the transformer, controls the temperature rise of the oil-immersed transformer, and ensures the normal operation and safety of the power supply and distribution system.

[0003] Chinese invention patent application CN120895367A discloses an oil-immersed transformer with circulating heat dissipation. This oil-immersed transformer with circulating heat dissipation can exchange heat with the transformer's heat through a cold source circulated inside the cooling pipe. Furthermore, a secondary cooling component is installed in the middle section of the cooling pipe. By cooling the cold source inside the cooling pipe in the middle section, the heat exchange effect of the cold source in the latter half of the cooling pipe is equal to that in the first half.

[0004] However, the heat absorption and heat dissipation processes of traditional fixed plate radiators are completely coupled and irreconcilable in time and space. In a fixed structure, the heat sink, as the heat absorption surface in contact with the hot oil in the circulation pipe and the convective heat dissipation surface in contact with the ambient air, has a static and unique surface area distribution and shape. When the transformer is under high load and high heat flux density conditions, the limited heat dissipation area and fixed air flow channels restrict the rate at which heat is dissipated to the ambient air, which may lead to insufficient heat dissipation capacity. At low load or low temperature environment startup, the same structure will make it difficult to maintain a suitable internal operating temperature of the transformer due to excessive heat dissipation, affecting startup efficiency and operational stability. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an oil-immersed transformer with circulating heat dissipation, thus solving the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an oil-immersed transformer with circulating heat dissipation, comprising a base and a transformer housing fixed to the base, and further comprising: The circulation pipe is located on the outside of the transformer casing, with its two ends connected to the upper and lower ends of the transformer casing, respectively. A heat dissipation assembly is located on the outside of the transformer housing and includes a first heat dissipation component fixed to one side of the transformer housing and a second heat dissipation component slidably mounted on the first heat dissipation component. The first heat sink includes: The end plate is a cover fixed to the outside of the transformer housing. The end plate is located outside the cover to accommodate the circulation pipe, and the outer surface of the end plate is provided with first fins with first through slots at equal intervals. The second heat sink includes a second fin disposed on both sides of the first fin and having a second through groove, wherein the second fin is slidably connected to the surface of the first fin; The second heat sink moves away from the transformer housing, causing the heat dissipation assembly to unfold and the first and second through slots to open for heat dissipation. The second heat sink moves towards the transformer housing, causing the heat dissipation assembly to contract and the first and second through slots to close for heat absorption.

[0007] Furthermore, the base has air vents on both sides, and a guide plate is installed on the outer side of the base below the air vents; The opening at the angle between the guide plate and the base faces downwards towards the heat dissipation assembly, which is used to enhance the airflow between the two sides of the transformer housing.

[0008] Furthermore, a reinforcing plate is provided on the outer side of the base, and the lower end of the guide plate is embedded in the reinforcing plate so that the lower end of the guide plate and the outer wall of the base form a water leakage groove.

[0009] Furthermore, the base is equipped with a transmission component for driving the heat dissipation components on both sides of the base to expand or contract; The transmission assembly includes a movable frame slidably installed in the base and a hydraulic cylinder. Both ends of the movable frame pass through the base and are equipped with connecting plates that are fixedly connected to the second heat sink. A rotating shaft is rotatably installed at the bottom of the base. The rotating shaft is located between two adjacent movable frames and a movable plate is fixed on the rotating shaft. The movable plate is provided with a slot, and a connecting pin is fixed on the movable frame that is slidably connected to the slot. One of the movable frames slides back and forth within the base via a hydraulic cylinder, causing the two opposing heat dissipation components to expand and contract respectively. The adjacent movable frame slides in the opposite direction via a movable plate, causing the two opposing heat dissipation components to expand and contract respectively.

[0010] Furthermore, the second heat sink also includes an inner side plate disposed on one side of the second fin and an outer side plate fixed to the other side of the second fin, wherein the inner side plate, the second fin and the outer side plate are integrally cast.

[0011] Furthermore, the length of the second channel is greater than the length of the first fin, so that the second channel still has an opening even when it is in a closed state.

[0012] Furthermore, support frames are fixed on both sides of the base, and the support frames are provided with slide rails that are slidably connected to the lower end of the inner side plate.

[0013] Furthermore, a guide frame is fixed to the outside of the transformer housing, and a through hole adapted to the guide frame is provided at the upper end of the inner side plate.

[0014] Furthermore, a pump connected to the output end of the circulation pipe is installed on the outside of the transformer housing, and an oil inlet pipe connected to the top of the transformer housing is installed at the output end of the pump. A filter connected to the input end of the circulation pipe is also installed on the outside of the transformer housing, and the input end of the filter is connected to the return oil pipe that connects to the bottom of the transformer housing.

[0015] Furthermore, an oil conservator is fixed to one end of the transformer housing, and a compensation pipe communicating with the transformer housing is installed on the oil conservator. An oil drain pipe with an oil drain valve is installed at the lower outer side of the transformer housing.

[0016] The present invention has the following beneficial effects: (1) The oil-immersed transformer with circulating heat dissipation has the ability to dynamically adjust the physical form of the heat dissipation component by setting a first heat dissipation component and a second heat dissipation component that can slide relative to each other. When the transformer shell is in a high temperature or heavy load condition, the second heat dissipation component can be driven away from the transformer shell, so that the first through slot and the second through slot are aligned and connected, which greatly increases the heat dissipation surface area and forms an efficient ventilation channel, thereby quickly dissipating the accumulated or continuously generated heat into the air, greatly improving the forced convection heat dissipation efficiency. When the transformer is in a low temperature, light load or heat preservation condition, the second heat dissipation component is driven to shrink, so that the first fin and the second fin are tightly attached, effectively increasing the contact heat conduction area with the internal circulation pipe, strengthening the heat absorption and heat storage capacity, and reducing unnecessary convection heat dissipation. This sequential operation of shrinking to collect heat and then expanding to dissipate heat, under the same external cooling conditions, maximizes the heat absorption and heat dissipation area in stages, significantly improving the overall thermal management efficiency and response capability.

[0017] (2) The oil-immersed transformer with circulating heat dissipation optimizes the aerodynamic environment around the transformer by setting the guide plates and air holes on both sides of the base. The guide plates can effectively collect and guide the ambient wind to blow more concentratedly and smoothly towards the heat dissipation components, thereby improving the airflow utilization rate. At the same time, some airflow passes through the bottom of the base through the air holes, forming a low-pressure area on the leeward side of the transformer shell, which induces the airflow in front to circulate, effectively improving the problem of airflow stagnation on the leeward side caused by the transformer body blocking the airflow. This allows the heat dissipation components on both sides of the shell to obtain better air scouring, improving the uniformity and stability of the overall heat dissipation effect and reducing the adverse effects of wind direction and environmental obstruction on heat dissipation performance.

[0018] (3) The oil-immersed transformer with circulating heat dissipation realizes the synchronous and reverse control of the expansion and contraction of the heat dissipation components on both sides of the transformer shell through the transmission component. The hydraulic cylinder drives the linear motion of one movable frame. The linear motion is converted into the rotational motion of the rotating shaft through the cooperation of the connecting pin and the slot on the movable plate, which in turn drives the other movable frame to move in the opposite direction. This ensures that the heat dissipation components on both sides of the transformer shell can strictly and synchronously perform the alternating action of expansion and contraction. On the one hand, it cooperates with the heat absorption and heat dissipation functions of the heat dissipation components to make the oil temperature inside the transformer shell more uniform. On the other hand, it forms a dynamically changing airflow field around the transformer shell, avoids local hot air stagnation, and further promotes the uniform dissipation of heat in space.

[0019] (4) The oil-immersed transformer with circulating heat dissipation has a second channel that is longer than the first fin. This allows the heat dissipation component to retain openings at both ends of the second channel even when it is in a contracted state and the first and second channels are closed. This ensures that even when the heat dissipation component is in the process of "absorbing heat", it can still maintain a minimum airflow through these retained micro-channels, induce a weak "chimney effect", and continuously remove some of the heat accumulated on the fin surface. This prevents the component from becoming a complete insulator when it is contracting and absorbing heat, thus achieving auxiliary heat dissipation during the heat absorption process and optimizing the thermal balance under transition conditions.

[0020] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 In this invention Figure 1 Another perspective view; Figure 3 This is a schematic diagram of the heat dissipation component when it is deployed in this invention; Figure 4 In this invention Figure 3 Top view; Figure 5 This is a schematic diagram of the structure of the heat dissipation component when it retracts in this invention; Figure 6 In this invention Figure 5 Top view; Figure 7 This is an exploded view of the heat dissipation component in this invention; Figure 8 This is a schematic diagram of the installation structure of the heat dissipation component in this invention; Figure 9 In this invention Figure 8 Top view; Figure 10This is a schematic diagram of the transmission component in this invention.

[0022] In the diagram, 1. Base; 2. Transformer housing; 3. Oil conservator; 4. Compensation pipe; 5. Oil drain pipe; 6. Cooling fan; 7. First heat sink; 71. End plate; 72. Cover; 73. First fin; 74. First through slot; 8. Second heat sink; 81. Inner side plate; 82. Second fin; 83. Outer side plate; 84. Second through slot; 9. Guide plate; 10. Water drain trough; 11. Oil return pipe; 12. Filter; 13. Oil inlet pipe; 14. Pump; 15. Support frame; 16. Circulation pipe; 17. Guide frame; 18. Connecting plate; 19. Air vent; 20. Movable frame; 21. Hydraulic cylinder; 22. Rotating shaft; 23. Movable plate; 24. Slot; 25. Connecting pin. Detailed Implementation

[0023] 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 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.

[0024] In the description of this invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around", etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0025] The following is based on Figures 1-10 This invention describes an oil-immersed transformer with circulating heat dissipation provided in an embodiment of the invention.

[0026] Please refer to Figures 1-10 This invention provides a technical solution: an oil-immersed transformer with circulating heat dissipation, including a base 1 and a transformer housing 2 fixed on the base 1. The base 1 has a cavity and a movable roller on its lower surface. It also includes a circulation pipe 16 and a heat dissipation assembly. The circulation pipe 16 is located on the outside of the transformer housing 2, and its two ends are respectively connected to the upper and lower ends of the transformer housing 2 for circulating hot oil inside the transformer housing 2, thereby accelerating the cooling of the inside of the transformer housing 2. The heat dissipation assembly provided in this embodiment is located on the outside of the transformer housing 2 and is used for heat absorption and heat dissipation of the circulation pipe 16. Specifically, the heat dissipation assembly includes a first heat dissipation component 7 fixed on one side of the transformer housing 2 and a second heat dissipation component 8 slidably installed on the first heat dissipation component 7.

[0027] The first heat sink 7 includes an end plate 71 located on the outside of the transformer housing 2. A cover 72 is fixed to the outside of the transformer housing 2. The end plate 71 is located outside the cover 72 to accommodate the circulation pipe 16. The outer surface of the end plate 71 is provided with first fins 73 having first through grooves 74 at equal intervals. Preferably, the end plate 71, cover 72, and first fins 73 are all made of alumina, and the first fins 73 and the end plate 71 are an integral structure. In addition, for the convenience of equipment maintenance, the covers 72 can be tightly connected with each other by rivets to facilitate the inspection and replacement of components later. The joints between the covers 72 and the circulation pipe 16 are filled with thermally conductive silicone grease to improve heat absorption efficiency. This embodiment provides... The second heat sink 8 includes second fins 82 disposed on both sides of the first fin 73 and having second through slots 84. The second fins 82 are slidably connected to the surface of the first fin 73. The second heat sink 8 moves away from the transformer housing 2, causing the heat sink assembly to unfold and opening the first through slot 74 and the second through slot 84, thereby improving the airflow around the first fin 73 and the second fin 82 to accelerate the heat dissipation of the heat sink assembly. When the second heat sink 8 moves towards the transformer housing 2, the heat sink assembly contracts and closes the first through slot 74 and the second through slot 84, thereby increasing the contact surface between the first heat sink 7 and the second heat sink 8 for heat absorption, which is beneficial for the heat conduction of the circulation pipe 16.

[0028] By altering the physical configuration and spatial arrangement of the heat dissipation components, their heat dissipation and heat storage functions are dynamically adjusted. When the heat dissipation components are deployed, the interlaced first and second through slots 74 and 84 form a continuous ventilation channel, inducing air turbulence and effectively disrupting the static air boundary layer adhering to the surfaces of the first fin 73 and the second fin 82, greatly improving the forced convection heat dissipation coefficient. When the heat dissipation components are contracted, the first fin 73 and the second fin 82 fit tightly together, not only increasing their thermal contact area with the circulation pipe 16, but also reducing heat exchange with cold air due to their closed structure, allowing them to focus more on absorbing and storing circulating heat. The heat transferred by the ring pipe 16, through this sequential operation of first contracting to collect heat and then expanding to dissipate heat, significantly improves the overall thermal management efficiency and responsiveness by maximizing the heat absorption and dissipation area in stages under the same external cooling conditions. In addition, the heat dissipation components on both sides of the transformer shell 2 can strictly and synchronously perform alternating expansion and contraction actions. On the one hand, this works with the heat absorption and dissipation functions of the heat dissipation components to make the oil temperature inside the transformer shell 2 more uniform. On the other hand, it forms a dynamically changing airflow field around the transformer shell 2, avoiding local hot air stagnation and further promoting the uniform dissipation of heat in space.

[0029] like Figures 8-10As shown, due to the presence of the transformer housing 2, the wind in the environment often only accelerates the air flow around the heat dissipation components on the windward side. Therefore, the oil-immersed transformer with circulating heat dissipation provided in this embodiment has air holes 19 on both sides of the base 1, and a guide plate 9 is installed on the outer side of the base 1 below the air holes 19. The opening of the guide plate 9 at the angle between it and the base 1 faces downward towards the heat dissipation components, which is used to enhance the air flow between the two sides of the transformer housing 2.

[0030] The opening at the angle between the guide plate 9 and the base 1 can effectively collect and guide the ambient airflow. Part of the airflow blows directly onto the heat dissipation components, while the other part enters the space below the base 1 through the air hole 19, forming an airflow that passes through the bottom of the transformer housing 2. This airflow can not only cool the base 1 and the internal transmission components, but more importantly, it can generate a low-pressure area on the leeward side of the transformer housing 2, attracting the airflow in front to go around to the rear, thereby significantly improving the uniformity of the airflow field around the transformer housing 2, especially the heat dissipation components on the leeward side, and reducing the occurrence of uneven heat dissipation caused by the equipment body blocking the heat dissipation.

[0031] like Figures 8-10 As shown, in order to prevent rainwater from flowing into the base 1 through the guide plate 9, the base 1 provided in this embodiment is provided with a reinforcing plate on the outside to improve the support effect of the base 1. The lower end of the guide plate 9 is embedded in the reinforcing plate so that the lower end of the guide plate 9 and the outer wall of the base 1 form a water leakage groove 10, which is conducive to the output of rainwater.

[0032] When rainwater flows down the surface of the guide plate 9, it is guided to the connection of the embedded reinforcing plate and flows into the narrow slit-shaped drainage groove 10 naturally formed by the lower end of the guide plate 9 and the outer wall of the base 1. This not only ensures the smooth introduction of airflow, but also reduces the risk of rainwater seeping into the base 1 and damaging the transmission components or causing corrosion, thus improving the operational reliability of the equipment in outdoor rainy environments.

[0033] like Figures 8-10As shown, to enable the heat dissipation components to unfold or retract, the base 1 provided in this embodiment is equipped with a transmission component for driving the heat dissipation components on both sides of the base 1 to unfold or retract. The transmission component provided in this embodiment includes a movable frame 20 slidably installed in the base 1 and a hydraulic cylinder 21. Both ends of the movable frame 20 penetrate the base 1 and are equipped with connecting plates 18 that are fixedly connected to the lower end of the second heat dissipation component 8. A rotating shaft 22 is rotatably installed at the bottom of the base 1. The rotating shaft 22 is located between two adjacent movable frames 20, and a movable plate 23 is fixed on the rotating shaft 22. The movable plate 23 is provided with a groove. The movable frame 20 has a connecting pin 25 that is slidably connected to the slot 24. In use, one of the movable frames 20 is driven by the hydraulic cylinder 21 to slide back and forth in the base 1, so that the two opposite heat dissipation components can be unfolded and retracted respectively. Through the sliding connection between the slot 24 and the connecting pin 25, the movable plate 23 and the connecting pin 25 can be rotated, so that the slot 24 at the other end of the movable plate 23 pulls the connecting pin 25, so that the connecting pin 25 at that position pulls the movable frame 20 to slide in the opposite direction, so that the two opposite heat dissipation components can be unfolded and retracted respectively.

[0034] Hydraulic cylinder 21 drives a movable frame 20 to move linearly. This movement is converted into the rotational movement of the movable plate 23 and the rotating shaft 22 through the engagement of the connecting pin 25 with the slot 24 on the movable plate 23. Then, through the slot 24 on the other side and the connecting pin 25, the movement is transmitted in the opposite direction to another movable frame 20, ensuring that the movement of the heat dissipation components on both sides of the transformer housing 2 is strictly synchronized and in opposite directions, thus completing the expansion and contraction of the heat dissipation components on both sides.

[0035] like Figures 3-6 As shown, to improve the heat transfer between the second heat sink 8 and the first heat sink 7, the second heat sink 8 provided in this embodiment further includes an inner side plate 81 disposed on one side of the second fin 82 and an outer side plate 83 fixed to the other side of the second fin 82. Preferably, a cooling fan 6 is installed on the outer side plate 83 to accelerate the heat dissipation effect of the heat dissipation assembly. When the heat dissipation assembly retracts, the inner side plate 81 abuts against the end plate 71 to further improve the heat transfer effect. In addition, the inner side plate 81, the second fin 82, and the outer side plate 83 provided in this embodiment are all integrally cast from alumina material, possessing advantages such as lightweight and high heat transfer coefficient. Features: The second heat sink 8 is integrally cast from alumina material, achieving lightweight and high rigidity in structure. The seamless connection between the inner side plate 81, the second fin 82 and the outer side plate 83 eliminates the contact thermal resistance that may exist in traditional splicing processes, allowing heat to be quickly and evenly conducted throughout the component. When the component shrinks, the large-area inner side plate 81 and the end plate 71 fit tightly together, forming a continuous and efficient heat conduction path from the circulation pipe 16 to the first heat sink 7 and then to the second heat sink 8. This ensures that in the heat absorption mode, heat can be quickly absorbed from the heat source and temporarily stored in the heat dissipation component, preparing for the subsequent heat dissipation process.

[0036] like Figure 3 and Figure 5 As shown, to ensure good heat dissipation during the retraction process, the length of the second through groove 84 in this embodiment is greater than the length of the first fin 73. This allows the second through groove 84 to remain open even when closed, enabling efficient airflow without sacrificing heat absorption after retraction, thus further improving heat dissipation. When the heat dissipation component retracts and the first fin 73 is inserted between the second fins 82, the longer second through groove 84 naturally forms vertically connected air channels at both ends. Although these channels are reduced in size, they still allow airflow. The effect is twofold: firstly, heat absorption relies mainly on close contact surfaces during retraction; secondly, the remaining small air channels induce a "chimney effect" or weak convection, continuously carrying away some heat from the surfaces of the first fin 73, the second fin 82, and the inner walls of the channels. This achieves both passive heat dissipation and active heat absorption, preventing the heat dissipation component from becoming a complete insulator during retraction and optimizing thermal performance during the transition.

[0037] like Figure 1 , Figure 3 and Figure 5 As shown, in order to improve the stability of the second heat sink 8 during the movement process, the base 1 provided in this embodiment is fixed with support frames 15 on both sides. The support frames 15 are provided with slide rails that are slidably connected to the lower end of the inner side plate 81. The stability of the second heat sink 8 during the movement process is improved through the sliding connection between the slide rails and the inner side plate 81.

[0038] like Figure 3 and Figure 5 As shown, to further improve the stability of the second heat sink 8 during movement, the transformer housing 2 provided in this embodiment is fixed with a guide frame 17 on the outside. The upper end of the inner side plate 81 is provided with a through hole adapted to the guide frame 17. The cooperation between the guide frame 17 and the through hole at the upper end of the inner side plate 81 constitutes the top guide of the second heat sink 8. It cooperates with the slide rail of the bottom support frame 15 to form a double-point constraint guide to prevent the second heat sink 8 from lateral swaying or twisting during the extension and retraction process, ensuring the straightness of its movement trajectory. This greatly enhances the wind load resistance of the heat sink assembly in the fully extended state, prevents the heat sink from shaking or generating noise due to strong winds, and at the same time ensures the alignment accuracy of the inner side plate 81 and the end plate 71 when retracted, thereby achieving the best contact heat conduction effect.

[0039] like Figure 1 , Figure 3 and Figure 5As shown, in order to realize the circulation of hot oil inside and outside the transformer housing 2, a pump 14 connected to the output end of the circulation pipe 16 is installed on the outside of the transformer housing 2 in this embodiment. An oil inlet pipe 13 connected to the top of the transformer housing 2 is installed at the output end of the pump 14. A filter 12 connected to the input end of the circulation pipe 16 is also installed on the outside of the transformer housing 2. An oil return pipe 11 connected to the bottom of the transformer housing 2 is installed at the input end of the filter 12.

[0040] The hot oil at the bottom of the transformer housing 2, which may contain impurities but has a relatively low temperature, is first drawn into the filter 12 through the return oil pipe 11 by the pump 14. After being filtered and purified, it enters the circulation pipe 16. In the circulation pipe 16, the oil transfers heat to the heat dissipation components. The cooled oil is then pressurized by the pump 14 and injected back into the transformer housing 2 through the oil inlet pipe 13. This process not only achieves efficient heat removal, but the top-entry oil method also facilitates natural convection of the oil inside the transformer housing 2, enhancing the cooling effect of the internal windings and core. The filter 12 ensures the cleanliness of the circulating oil circuit and prevents impurities from accumulating in the narrow circulation pipe 16 and affecting heat exchange.

[0041] like Figure 1 and Figure 2 As shown, an oil conservator 3 is fixed to one end of the transformer housing 2. A compensation pipe 4 connected to the transformer housing 2 is installed on the oil conservator 3. An oil drain pipe 5 with an oil drain valve is installed at the lower outer side of the transformer housing 2. The oil conservator 3 is connected to the transformer housing 2 through the compensation pipe 4 to compensate for the volume expansion and contraction of the oil inside the transformer housing 2 due to temperature changes, thereby maintaining the stability of the internal pressure of the transformer housing 2. The oil drain pipe 5 is used for the safe discharge of the oil inside the transformer housing 2 during maintenance, oil replacement or fault.

[0042] When in use (operating), the pump 14 is started, and the oil is drawn into the filter 12 through the return oil pipe 11. After being filtered and purified, it enters the circulation pipe 16. In the circulation pipe 16, the oil transfers heat to the heat dissipation components. The cooled oil is then pressurized by the pump 14 and injected back into the transformer housing 2 through the oil inlet pipe 13, which realizes the efficient removal of heat. In addition, the top oil inlet method also facilitates the natural convection of the oil inside the transformer housing 2.

[0043] The hydraulic cylinder 21 is activated, which drives one of the movable frames 20 to slide inside the base 1. The connecting pin 25 engages with the slot 24 on the movable plate 23, which is converted into the rotational motion of the movable plate 23 and the rotating shaft 22. Then, through the sliding connection between the slot 24 on the other side and the connecting pin 25, the motion is transmitted in the opposite direction to the other movable frame 20. This ensures that the movement of the heat dissipation components on both sides of the transformer housing 2 is strictly synchronized and in opposite directions, thus completing the expansion and contraction of the heat dissipation components on both sides.

[0044] When the heat dissipation component is deployed, the staggered first through slot 74 and second through slot 84 form a continuous ventilation channel, inducing air turbulence and effectively breaking the static air boundary layer attached to the surface of the first fin 73 and the second fin 82, greatly improving the forced convection heat dissipation coefficient. When the heat dissipation component is contracted, the first fin 73 and the second fin 82 are tightly fitted together, which not only increases the thermal contact area with the circulation pipe 16, but also reduces the heat exchange with the cold air due to its closed structure, allowing it to focus more on absorbing and storing the heat transferred by the circulation pipe 16. This sequential operation of first contracting to collect heat and then deploying to dissipate heat significantly improves the overall thermal management efficiency and response capability by maximizing the heat absorption and dissipation area in stages under the same external cooling conditions.

[0045] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0046] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. An oil-immersed transformer with circulating heat dissipation, comprising a base (1) and a transformer housing (2) fixed on the base (1), characterized in that, Also includes: The circulation pipe (16) is located on the outside of the transformer housing (2), and its two ends are respectively connected to the upper and lower ends of the transformer housing (2); The heat dissipation assembly is located on the outside of the transformer housing (2) and includes a first heat dissipation component (7) fixed to one side of the transformer housing (2) and a second heat dissipation component (8) slidably mounted on the first heat dissipation component (7). The first heat sink (7) includes: End plate (71), a cover (72) is fixed on the outside of the transformer housing (2), the end plate (71) is located on the outside of the cover (72) to accommodate the circulation pipe (16), and the outer surface of the end plate (71) is provided with first fins (73) having first through grooves (74) at equal intervals. The second heat sink (8) includes a second fin (82) disposed on both sides of the first fin (73) and having a second through groove (84), wherein the second fin (82) is slidably connected to the surface of the first fin (73); The second heat sink (8) moves away from the transformer housing (2), causing the heat sink assembly to unfold and opening the first through slot (74) and the second through slot (84) for heat dissipation. The second heat sink (8) moves towards the transformer housing (2), causing the heat sink assembly to contract and closing the first through slot (74) and the second through slot (84) for heat absorption.

2. The oil-immersed transformer with circulating heat dissipation according to claim 1, characterized in that, The base (1) has air holes (19) on both sides, and a guide plate (9) is installed on the outer side of the base (1) below the air holes (19). The opening at the angle between the guide plate (9) and the base (1) faces downwards towards the heat dissipation assembly, which is used to enhance the airflow between the two sides of the transformer housing (2).

3. The oil-immersed transformer with circulating heat dissipation according to claim 2, characterized in that, The base (1) is provided with a reinforcing plate on the outside, and the lower end of the guide plate (9) is embedded in the reinforcing plate so that the lower end of the guide plate (9) and the outer wall of the base (1) form a water leakage groove (10).

4. The oil-immersed transformer with circulating heat dissipation according to claim 3, characterized in that, The base (1) is equipped with a transmission component inside, which is used to drive the heat dissipation components on both sides of the base (1) to unfold or retract; The transmission assembly includes a movable frame (20) slidably installed in the base (1) and a hydraulic cylinder (21). Both ends of the movable frame (20) pass through the base (1) and are equipped with connecting plates (18) that are fixedly connected to the second heat sink (8). A rotating shaft (22) is rotatably installed at the bottom of the base (1). The rotating shaft (22) is located between two adjacent movable frames (20), and a movable plate (23) is fixed on the rotating shaft (22). The movable plate (23) is provided with a slot (24). A connecting pin (25) that is slidably connected to the slot (24) is fixed on the movable frame (20). One of the movable frames (20) slides back and forth in the base (1) via a hydraulic cylinder (21) so that the two opposite heat dissipation components can be unfolded and retracted respectively. The adjacent movable frame (20) slides in the opposite direction via a movable plate (23) so that the two opposite heat dissipation components can be unfolded and retracted respectively.

5. An oil-immersed transformer with circulating heat dissipation according to any one of claims 1-4, characterized in that, The second heat sink (8) also includes an inner side plate (81) disposed on one side of the second fin (82) and an outer side plate (83) fixed on the other side of the second fin (82). The inner side plate (81), the second fin (82) and the outer side plate (83) are integrally cast.

6. The oil-immersed transformer with circulating heat dissipation according to claim 5, characterized in that, The length of the second through groove (84) is greater than the length of the first fin (73) so that the second through groove (84) still has an opening when it is in a closed state.

7. The oil-immersed transformer with circulating heat dissipation according to claim 6, characterized in that, The base (1) is fixed with support frames (15) on both sides, and the support frames (15) are provided with slide rails that are slidably connected to the lower end of the inner side plate (81).

8. The oil-immersed transformer with circulating heat dissipation according to claim 7, characterized in that, The transformer housing (2) is fixed with a guide frame (17) on the outside, and the upper end of the inner side plate (81) is provided with a through hole that is compatible with the guide frame (17).

9. An oil-immersed transformer with circulating heat dissipation according to claim 8, characterized in that, A pump (14) connected to the output end of the circulation pipe (16) is installed on the outside of the transformer housing (2). An oil inlet pipe (13) connected to the top of the transformer housing (2) is installed at the output end of the pump (14). A filter (12) connected to the input end of the circulation pipe (16) is also installed on the outside of the transformer housing (2). The input end of the filter (12) is connected to the return oil pipe (11) connected to the bottom of the transformer housing (2).

10. An oil-immersed transformer with circulating heat dissipation according to claim 9, characterized in that, One end of the transformer housing (2) is fixed with an oil tank (3), and a compensation pipe (4) connected to the transformer housing (2) is installed on the oil tank (3). An oil drain pipe (5) with an oil drain valve is installed on the lower outer side of the transformer housing (2).

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