Outdoor oil-immersed transformer convenient for heat dissipation

Abstract

The invention discloses an outdoor oil-immersed transformer convenient for heat dissipation, and relates to the technical field of transformers, the outdoor oil-immersed transformer comprises a box body and a transformer body fixedly mounted at an inner cavity of the box body, a rainproof cover is fixedly mounted at the top of the box body, and fans are fixedly mounted on two sides of the box body; heat dissipation mechanisms are installed on the two sides of an inner cavity of the box body, cooling mechanisms are installed on the heat dissipation mechanisms, a liquid limiting plate is fixedly connected between the heat dissipation mechanisms, and a floating guide pipe is fixedly installed on the top of the liquid limiting plate. According to the outdoor oil-immersed transformer facilitating heat dissipation, automatic opening and closing of an oil duct are achieved through thermal expansion of oil in the cooling mechanism, oil circulation heat dissipation can be completed without external electric drive, the heat dissipation mechanism is arranged in the inner cavity of the transformer box, air cooling is guaranteed, outdoor dust can be effectively prevented from entering the box to be accumulated, and the heat dissipation efficiency is improved. And dust accumulation and blockage of the cooling fins and the heat exchange pipe wall are avoided, heat resistance is increased, maintenance and cleaning frequency is reduced, and the device is suitable for outdoor severe dust raising environments.

Description

Technical Field

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

[0002] As a core piece of equipment in outdoor power transmission and distribution systems, oil-immersed transformers rely on insulating oil for insulation and heat conduction. Their heat dissipation efficiency directly determines the equipment's operational stability, insulation life, and overload capacity. Under outdoor conditions, transformers are exposed to the open environment for extended periods, facing complex conditions such as high temperatures and sunlight, wind and dust, load fluctuations, and sudden power outages. This places higher demands on the reliability, self-adaptability, and adaptability to operation without power in their heat dissipation structures. Existing transformers with heat dissipation functions still have shortcomings in practical use. For example, the transformer and temperature control cooling system with a high-efficiency oil-cooled structure disclosed in CN116759199B utilizes air cooling, ground cooling, heat sink assembly, and spray components in synergy. A circulating pump drives hot oil into an S-shaped oil-cooling pipe for underground cooling, then returns it to the tank for cyclical cooling, achieving rapid heat dissipation under high loads. However, in practical use, the core components such as the circulating pump and electrically controlled valves rely entirely on external power. When there is a power outage due to outdoor line faults, maintenance, or power interruptions under extreme conditions, oil circulation stops, and hot oil cannot be discharged and cooled in time. This leads to heat accumulation inside the tank, potentially causing safety hazards such as excessive oil temperature and winding overheating and burnout. In addition, traditional transformer heat dissipation structures generally use fixed heat dissipation fins, fixed open heat dissipation cavities, or external heat dissipation fin groups. In outdoor sandy and dusty environments, heat dissipation fins and heat dissipation channels are prone to accumulating dust and debris, blocking air circulation channels and heat exchange interfaces, significantly increasing thermal resistance and reducing heat exchange efficiency. Summary of the Invention

[0003] To solve the above technical problems, the present invention is implemented through the following technical solution: an outdoor oil-immersed transformer with convenient heat dissipation, including a tank and a transformer body fixedly installed in the inner cavity of the tank. A high-voltage bushing and a low-voltage bushing are fixedly installed on the top of the tank. A rain cover is fixedly installed on the top of the tank. The high-voltage bushing and the low-voltage bushing are both located below the rain cover. The rain cover is used to cover the interface between the high-voltage bushing, the low-voltage bushing and the top of the tank, blocking outdoor rainwater, snow, and sand and dust from directly washing over it, avoiding rainwater seeping into the tank and causing the insulating oil to become damp and short-circuit, thus improving the outdoor rain and dust protection capability. Fans are fixedly installed on both sides of the tank. The fans are used to actively draw in low-temperature external air and blow it into the tank, accelerating the dissipation of heat from the hot oil and improving the overall heat dissipation rate. A heat dissipation mechanism is installed on both sides of the inner cavity of the box. A liquid limiting plate is fixedly connected between the heat dissipation mechanisms. A guide tube is fixedly installed on the top of the liquid limiting plate. The liquid limiting plate is used to limit the oil level of the insulating oil inside the box, and the guide tube provides space for the expansion of hot oil. A cooling mechanism is installed on a heat dissipation mechanism. External cooling air is introduced by a fan to dissipate heat from the heat dissipation mechanism, and at the same time, the hot oil inside the cooling mechanism is cooled. The cooling mechanism includes an oil-passing bend, which is located inside the heat dissipation mechanism. The oil inlet of the bend penetrates the heat dissipation mechanism and extends to its outer side, while the oil outlet extends through the heat dissipation mechanism to its bottom. The bend is used to pass hot oil through it. When the hot oil flows through the bend, the pipe wall fully contacts the external cold air for heat exchange, rapidly transferring the internal heat of the oil to the air, thus cooling the oil. The bend structure extends the flow path of the hot oil, increasing the heat exchange contact time and heat dissipation area. The oil inlet of the bend is rotated via a shaft to a sealing plate. The sealing plate controls the opening and closing of the oil inlet channel of the bend. In low-temperature conditions, the sealing plate closes, blocking the oil inlet and preventing the insulating oil from flowing in freely. In high-temperature conditions, the oil outlet is closed during cooling. Driven by a moving component, the valve rotates and opens, opening the oil inlet channel and allowing hot oil to enter the oil passage bend. This enables adaptive opening and closing control based on oil temperature. A one-way valve is installed at the oil outlet of the oil passage bend, allowing cooled oil to flow out of the bend in one direction only to the bottom of the tank, preventing cold oil at the bottom of the tank from flowing back into the oil passage bend and ensuring unidirectional oil circulation. A cooling drive is installed on the outer surface of the sealing rotating plate, located inside the guide tube. When the transformer heats up, the oil temperature inside the tank rises, and the expansion of the hot oil drives the cooling drive, which in turn drives the sealing rotating plate to open the oil inlet channel. The hot oil enters the oil passage bend for cooling, and the cooling drive automatically opens the oil inlet channel without the need for electricity, sensors, or pumps, improving heat dissipation reliability during power outages.

[0004] Preferably, the cooling drive component includes a float and a connecting plate. The float is disposed inside the guide tube. The density of the float is less than that of the insulating oil. When the oil temperature rises, the insulating oil thermally expands and the oil level rises. The float rises vertically in sync with the oil level. An elastic rope is fixedly installed at the axis at the bottom of the float, and a limit plate is fixedly installed at the bottom end of the elastic rope.

[0005] Preferably, levers are rotatably mounted at both ends of the connecting plate, and the other end of the levers is rotatably mounted on the outer surface of the sealing plate via a rotating shaft. A through hole is opened on the surface of the connecting plate, and the elastic rope is placed inside the through hole. The limiting plate is squeezed and matched with the bottom of the connecting plate. When the oil temperature drops and the oil level falls, the elastic tension and the weight of the float block work together to pull the float block to quickly reset and move downward, simultaneously driving the connecting plate and levers to reset, so that the sealing plate closes and blocks the oil inlet, realizing automatic shutdown at low temperature. The lever converts the vertical displacement of the float block into the rotational opening and closing displacement of the sealing plate, ensuring that the small upward movement of the float block can drive the sealing plate to open stably, improving the transmission sensitivity.

[0006] Preferably, a support rod is rotatably mounted at the fulcrum of the lever, and a rod frame is mounted on the outer surface of the support rod, with the rod frame fixedly mounted at the bottom of the liquid limiting plate.

[0007] Preferably, a limiting annular groove is provided at the bottom of the liquid limiting plate. The limiting annular groove is located directly below the guide tube. The limiting annular groove is squeezed and adapted to the lever. The limiting annular groove is used to limit and constrain the swing range of the upper end of the lever, and to restrict the excessive deflection of the lever.

[0008] Preferably, a retaining ring is fixedly installed at the bottom of the inner wall of the guide tube. The retaining ring is squeezed and adapted to the bottom of the float. The retaining ring is used to limit and block the float at its downward limit position to prevent the float from moving too far downward and leaving the inner cavity of the guide tube.

[0009] Preferably, the heat dissipation mechanism includes an L-shaped partition, which is fixedly installed on the inner wall of the housing. The L-shaped partition and the inner wall of the housing enclose an independent air-cooled heat exchange chamber, in which an oil-filled bend is wrapped. The fan guides the cold air to flow through the outer wall of the oil-filled bend, thereby improving the air-cooling utilization rate. A ventilation hole is provided at the top of the outer surface of the L-shaped partition to balance the internal air pressure. Mounting hole one and mounting hole two are respectively provided on the outer surface and bottom surface of the L-shaped partition, and the two ends of the oil-filled bend are respectively set in mounting hole one and mounting hole two.

[0010] Preferably, the outer surface of the L-shaped partition is provided with strip-shaped heat dissipation holes, which are staggered with the straight pipe section of the oil-passing bend. A self-adjusting heat dissipation component is installed inside the strip-shaped heat dissipation hole. The self-adjusting heat dissipation component can automatically adjust the windward angle of the heat dissipation plate according to the fan air volume to improve heat dissipation efficiency.

[0011] Preferably, the self-adjusting heat dissipation component includes a rotating shaft, which is rotatably installed inside the strip-shaped heat dissipation hole. A heat dissipation plate is fixedly installed on the outer surface of the rotating shaft. The heat dissipation plate is inclined. When the fan blows air, the airflow pushes the heat dissipation plate to rotate around the rotating shaft, increasing the windward area of ​​the heat dissipation plate and improving the heat dissipation efficiency. When the fan stops blowing air, the heat dissipation plate is reset under the tension of the reset spring and dissipates heat through natural wind. A sealing plate is installed between the heat dissipation plate and the inner wall of the strip-shaped heat dissipation hole to prevent leakage of insulating oil.

[0012] Preferably, a limiting strip is fixedly installed at one end of the heat sink, and the limiting strip is squeezed and adapted to the limiting strip. A return spring is fixedly connected between the other end of the heat sink and the inner curved surface of the L-shaped partition. The return spring is evenly distributed on the outer surface of the heat sink. The limiting strip and the limiting strip cooperate to limit the opening limit position of the heat sink, prevent the heat sink from over-rotating, and ensure the stable operation of the structure.

[0013] This invention provides an outdoor oil-immersed transformer that facilitates heat dissipation. It offers the following advantages: (I) This outdoor oil-immersed transformer, which facilitates heat dissipation, utilizes a cooling mechanism. During operation, the insulating oil temperature rises and its volume expands, causing the oil level to rise and lift the float in the guide tube. The float, via elastic ropes and limit plates, pulls the connecting plate and lever. The lever rotates around the support rod, causing the sealing plate to open, allowing the upper layer of hot oil to enter the oil passage bend. After cooling, the oil flows back to the bottom of the tank via a one-way valve. As the oil temperature decreases, the float falls back under its own weight and the elastic ropes, and the sealing plate automatically closes. The cooling mechanism achieves automatic mechanical opening and closing of the oil passages through the thermal expansion of the oil. It eliminates the need for a circulating pump, solenoid valve, sensor, and external power drive to complete oil circulation and heat dissipation, freeing the transformer from dependence on external power supply. Even under conditions of outdoor power outages, line faults, or maintenance shutdowns, it can still achieve normal oil circulation and heat dissipation, improving the operational safety and continuous working reliability of the outdoor transformer.

[0014] (ii) This outdoor oil-immersed transformer, which facilitates heat dissipation, eliminates the transformer's dependence on external power supply when the fan starts. It can still achieve normal oil circulation and heat dissipation under conditions such as outdoor power outages, line faults, and maintenance power outages, thereby improving the operational safety and continuous working reliability of the outdoor transformer.

[0015] (III) This outdoor oil-immersed transformer, which facilitates heat dissipation, is designed with a combination of heat dissipation and cooling mechanisms. The heat dissipation mechanism is located in the inner cavity of the transformer box. While ensuring air cooling, it can effectively prevent outdoor sand and dust from entering the heat dissipation cavity and accumulating inside, avoiding dust accumulation and blockage on the heat sink and heat exchange tube walls, increasing thermal resistance, reducing the frequency of maintenance and cleaning, and making it suitable for harsh outdoor dusty environments.

[0016] (iv) This outdoor oil-immersed transformer, which facilitates heat dissipation, has a longer flow path and longer residence time for hot oil in the curved pipe through the setting of the oil passage bend. This prolongs the heat exchange time of hot oil, increases the heat dissipation contact area, and improves the heat transfer efficiency between oil and air. It can quickly reduce the temperature of hot oil, enhance the overload capacity of the transformer, and extend the overall service life of the transformer and the insulation life. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the appearance of the present invention; Figure 3 This is a schematic cross-sectional view of the housing portion of the present invention; Figure 4 This is a schematic diagram of the internal appearance of the housing of the present invention; Figure 5 This is a schematic diagram of the internal structure of the housing of the present invention; Figure 6 This is a cross-sectional view of the guide tube portion of the present invention; Figure 7 This is a schematic diagram of the heat dissipation mechanism of the present invention; Figure 8 This is a schematic diagram of a portion of the heat dissipation mechanism of the present invention; Figure 9 This is a schematic diagram of the self-adjusting heat dissipation component structure of the present invention; Figure 10 This is a schematic diagram of the cooling mechanism of the present invention; Figure 11 This is a schematic diagram of the cooling drive component structure of the present invention; Figure 12 This is an enlarged schematic diagram of part A of the present invention.

[0018] In the diagram: 1. Housing; 2. Top cover; 3. Rain cover; 4. High-pressure bushing; 5. Fan; 6. Heat dissipation mechanism; 61. L-shaped partition; 62. Ventilation hole; 63. Mounting hole one; 64. Mounting hole two; 65. Strip-shaped heat dissipation hole; 66. Self-adjusting heat dissipation component; 661. Rotating shaft; 662. Heat dissipation plate; 663. Limiting strip one; 664. Sealing plate; 665. Return spring; 67. Limiting element. Item 2; 7. Cooling mechanism; 71. Oil bend; 72. Sealing rotating plate; 73. One-way valve; 74. Cooling drive component; 741. Float; 742. Lever; 743. Support rod; 744. Rod frame; 745. Connecting plate; 746. Through hole; 747. Elastic rope; 748. Limiting plate; 8. Transformer body; 9. Liquid limiting plate; 10. Guide float pipe; 11. Retaining ring; 12. Limiting ring groove. Detailed Implementation

[0019] 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.

[0020] For the first embodiment, please refer to... Figure 1-10 This invention provides a technical solution: an outdoor oil-immersed transformer for easy heat dissipation, including a housing 1 and a transformer body 8 fixedly installed in the inner cavity of the housing 1. A high-voltage bushing 3 and a low-voltage bushing 4 are fixedly installed on the top of the housing 1. A rain cover 2 is fixedly installed on the top of the housing 1. The high-voltage bushing 3 and the low-voltage bushing 4 are both located below the rain cover 2. The rain cover 2 is used to shield the interface between the high-voltage bushing 3, the low-voltage bushing 4 and the top of the housing 1, blocking outdoor rainwater, snow, and sand from directly washing away the material, preventing rainwater from seeping into the interior of the housing 1 and causing the insulating oil to become damp and short-circuit, thus improving the outdoor rain and dust protection capabilities. Fans 5 are fixedly installed on both sides of the housing 1. The fans 5 are used to actively draw in low-temperature external air and blow it into the interior of the housing 1 to accelerate the dissipation of heat from the hot oil and improve the overall heat dissipation rate. Heat dissipation mechanism 6 is installed on both sides of the inner cavity of the box 1. A liquid limiting plate 9 is fixedly connected between the heat dissipation mechanisms 6. A guide tube 10 is fixedly installed on the top of the liquid limiting plate 9. The liquid limiting plate 9 is used to limit the oil level of the insulating oil inside the box 1. The guide tube 10 provides space for the expansion of hot oil. Cooling mechanism 7 is installed on heat dissipation mechanism 6. External cooling air is introduced through fan 5 to dissipate heat from heat dissipation mechanism 6, and at the same time, the hot oil inside cooling mechanism 7 is cooled. The cooling mechanism 7 includes an oil-passing bend 71, which is located inside the heat dissipation mechanism 6. The oil inlet end of the oil-passing bend 71 passes through the heat dissipation mechanism 6 and extends to its outer side, while the oil outlet end of the oil-passing bend 71 passes through the heat dissipation mechanism 6 and extends to its bottom. The oil-passing bend 71 is used to pass hot oil. When the hot oil flows through the bend, the pipe wall comes into full contact with the external cold air for heat exchange, which quickly transfers the heat inside the oil to the air, thereby cooling the oil. The bend structure extends the flow path of the hot oil, increases the heat exchange contact time and heat dissipation area. The oil inlet end of the oil-passing bend 71 is rotated by a shaft to a sealing plate 72. The sealing plate 72 is used to control the opening and closing of the oil inlet channel of the oil-passing bend 71. In the low temperature state, the sealing plate 72 is closed to block the oil inlet and prevent the insulating oil from flowing in at will. In the high temperature state, it is rotated and opened by the cooling drive component 74 to open the oil inlet channel, allowing the hot oil to enter the oil-passing bend 71, thereby realizing the oil temperature adaptive opening and closing control. A one-way valve 73 is installed at the oil outlet end of the oil passage bend 71. The one-way valve 73 only allows the cooled oil to flow out of the oil passage bend 71 in one direction to the bottom of the tank 1, preventing the cold oil at the bottom of the tank 1 from flowing back into the oil passage bend 71, thus ensuring the unidirectional flow of the oil circulation. A cooling drive component 74 is installed on the outer surface of the sealing rotating plate 72. The cooling drive component 74 is located inside the guide tube 10. When the transformer heats up, the oil temperature in the tank 1 rises, and the hot oil expands, driving the cooling drive component 74 to operate, which in turn drives the sealing rotating plate 72 to open the oil inlet channel. The hot oil enters the oil passage bend 71 for cooling. The cooling drive component 74 realizes the automatic opening of the oil inlet channel without the need for electricity, sensors, and pump body drive, thus improving the heat dissipation reliability under power failure conditions.

[0021] The second embodiment is based on the first embodiment; please refer to [link / reference]. Figure 7-10 As shown, the heat dissipation mechanism 6 includes an L-shaped partition 61, which is fixedly installed on the inner wall of the housing 1. The L-shaped partition 61 and the inner wall of the housing 1 enclose an independent air-cooled heat exchange chamber, which encloses the oil-through bend 71 in the chamber. The fan 5 guides the cold air to flow through the outer wall of the oil-through bend 71, thereby improving the air-cooling utilization rate. A ventilation hole 62 is provided on the top of the outer surface of the L-shaped partition 61. The ventilation hole 62 is used to balance the internal air pressure. The outer surface and bottom surface of the L-shaped partition 61 are respectively provided with mounting hole 1 63 and mounting hole 2 64. The two ends of the oil-through bend 71 are respectively set in mounting hole 1 63 and mounting hole 2 64. The outer surface of the L-shaped partition 61 is provided with strip-shaped heat dissipation holes 65. The strip-shaped heat dissipation holes 65 are staggered with the straight pipe section of the oil-passing bend 71. The interior of the strip-shaped heat dissipation holes 65 is equipped with a self-adjusting heat dissipation component 66. The self-adjusting heat dissipation component 66 can automatically adjust the windward angle of the heat dissipation plate 662 according to the air volume of the fan 5 to improve the heat dissipation efficiency. The self-adjusting heat sink 66 includes a rotating shaft 661, which is rotatably installed inside the strip-shaped heat sink 65. A heat sink 662 is fixedly installed on the outer surface of the rotating shaft 661. The heat sink 662 is inclined. When the fan 5 blows air, the airflow pushes the heat sink 662 to rotate around the rotating shaft 661, increasing the windward area of ​​the heat sink 662 and improving the heat dissipation efficiency. When the fan 5 stops blowing air, the heat sink 662 is reset under the tension of the return spring 665 and dissipates heat through natural wind. A sealing plate 664 is installed between the heat sink 662 and the inner wall of the strip-shaped heat sink 65 to prevent leakage of insulating oil. Limiting strip 663 is fixedly installed at one end of the heat sink 662. Limiting strip 663 and limiting strip 67 are pressed and matched. A return spring 665 is fixedly connected between the other end of the heat sink 662 and the inner curved surface of the L-shaped partition 61. The return spring 665 is evenly distributed on the outer surface of the heat sink 662. Limiting strip 663 and limiting strip 67 cooperate to limit the opening limit position of the heat sink 662, prevent the heat sink 662 from over-twisting, and ensure the stable operation of the structure.

[0022] The third embodiment is based on embodiments one and two; please refer to [link / reference]. Figure 6-12 As shown, the cooling drive component 74 includes a float 741 and a connecting plate 745. The float 741 is disposed inside the guide tube 10. The density of the float 741 is less than that of the insulating oil. When the oil temperature rises, the insulating oil expands thermally and the oil level rises. The float 741 floats vertically upward synchronously with the oil level. An elastic rope 747 is fixedly installed at the axis at the bottom of the float 741. A limit piece 748 is fixedly installed at the bottom end of the elastic rope 747. Levers 742 are rotatably mounted on both ends of the connecting plate 745. The other end of the levers 742 is rotatably mounted on the outer surface of the sealing plate 72 via a rotating shaft. A through hole 746 is opened on the surface of the connecting plate 745. An elastic rope 747 is set inside the through hole 746. The limiting piece 748 is squeezed and matched with the bottom of the connecting plate 745. When the oil temperature drops and the oil level falls, the elastic tension and the weight of the float 741 work together to pull the float 741 to quickly reset and move downward. At the same time, the connecting plate 745 and levers 742 are reset, so that the sealing plate 72 closes and blocks the oil inlet, realizing automatic shutdown at low temperature. The lever 742 converts the vertical displacement of the float 741 into the rotational opening and closing displacement of the sealing plate 72, ensuring that the float 741 can drive the sealing plate 72 to open stably with a small upward movement, thus improving the transmission sensitivity. A support rod 743 is rotatably mounted at the fulcrum of the lever 742, and a rod holder 744 is mounted on the outer surface of the support rod 743. The rod holder 744 is fixedly mounted at the bottom of the liquid limiting plate 9. A limiting annular groove 12 is provided at the bottom of the liquid limiting plate 9. The limiting annular groove 12 is located directly below the guide float tube 10. The limiting annular groove 12 is squeezed and adapted to the lever 742. The limiting annular groove 12 is used to limit and constrain the swing range of the upper end of the lever 742 and restrict the excessive deflection of the lever 742. A retaining ring 11 is fixedly installed at the bottom of the inner wall of the guide tube 10. The retaining ring 11 is squeezed and matched with the bottom of the float 741. The retaining ring 11 is used to limit and block the float 741 at its downward limit position to prevent the float 741 from moving too far down and leaving the inner cavity of the guide tube 10.

[0023] When the transformer is in use, the transformer body 8 generates heat and transfers it to the insulating oil inside the tank 1. When the transformer is operating under high load, the heat generated by the transformer body 8 increases, the temperature of the insulating oil inside the tank 1 rises and thermal expansion occurs, the oil volume increases, and the oil level rises. The liquid limiting plate 9 limits the oil level height, and the guide float tube 10 provides upward space for the hot oil expansion. The float 741 has a density less than that of the insulating oil. Under the buoyancy generated by the rising oil level, it floats vertically upward along the inner wall of the guide float tube 10. When the float 741 moves upward, it pulls the elastic rope 747 to move upward simultaneously. The limiting piece 748 at the bottom of the elastic rope 747 pushes the connecting plate 745 upward, causing the connecting plate 745 to move upward. The connecting plate 745 moves upward, causing the levers 742 at both ends to swing around the support rod 743. The support rod 743 is fixedly installed at the bottom of the liquid limiting plate 9 through the rod frame 744, providing stable support for the lever 742. The lever 742 converts the vertical upward displacement of the float 741 into rotational displacement, causing the sealing rotating plate 72 to rotate around the rotating shaft, so that the oil inlet channel of the oil passage bend 71 is opened. The high-temperature hot oil in the upper layer enters the interior of the oil passage bend 71 under the action of oil pressure. This process is driven entirely by the thermal expansion of the oil, without the need for electricity, sensors and circulation pumps. It can still start and dissipate heat normally in the case of outdoor power failure. At the same time, the fans 5 on both sides of the box 1 start. The fans 5 draw in the low-temperature air from outside and blow it into the independent air-cooled heat exchange chamber formed by the L-shaped partition 61 and the inner wall of the box 1. The airflow thrust acts on the heat dissipation plate 662, overcomes the tension of the return spring 665, and pushes the heat dissipation plate 662 to rotate outward around the rotating shaft 661, increasing the windward angle and windward area of ​​the heat dissipation plate 662. The cold air blows towards the straight section of the oil passage bend 71. Since the strip-shaped heat dissipation holes 65 and the straight section of the oil passage bend 71 are staggered, the cold air can fully exchange heat inside the box 1, greatly improving the heat dissipation efficiency. High-temperature hot oil flows inside the oil bend 71. The oil bend 71 extends the oil flow path, increases the heat exchange time and heat dissipation area, and the pipe wall continuously exchanges heat with the cold air, transferring the heat inside the oil to the air to achieve the cooling of the hot oil. The cooled oil flows to the oil outlet end of the oil bend 71, opening the one-way valve 73 at the oil outlet end. The one-way valve 73 is open in one direction, allowing the cooled oil to flow out only to the bottom of the tank 1, while preventing the cold oil at the bottom from flowing back into the oil bend 71. The cooled oil flows back to the bottom of the tank 1 and then flows upward again to achieve continuous circulation heat dissipation. When the transformer load decreases and the heat generation decreases, the temperature of the insulating oil inside the tank 1 drops, the oil contracts and the oil level falls back. The float 741 loses its buoyancy support and falls back down along the guide tube 10 under the combined action of its own weight and the elastic tension of the elastic rope 747 until it is in contact with the retaining ring 11. The float 741 moves down and drives the elastic rope 747, the limiting plate 748 and the connecting plate 745 to move down and reset synchronously. The connecting plate 745 drives the lever 742 to swing in the opposite direction, which in turn pushes the sealing rotating plate 72 to rotate and close, re-seals the oil inlet end of the oil passage bend 71, and the hot oil stops entering the oil passage bend 71, and the oil circulation is automatically shut off. When outdoor power is interrupted, the fan 5 stops blowing air, and the heat sink 662 and the oil-through bend 71 can also be cooled synchronously by natural wind.

[0024] 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 a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0025] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An outdoor oil-immersed transformer with convenient heat dissipation, characterized in that, include: The enclosure (1) and the transformer body (8) are fixedly installed in the inner cavity of the enclosure (1). A high-voltage bushing (3) and a low-voltage bushing (4) are fixedly installed on the top of the enclosure (1). A rain cover (2) is fixedly installed on the top of the enclosure (1). The high-voltage bushing (3) and the low-voltage bushing (4) are both located below the rain cover (2). Fans (5) are fixedly installed on both sides of the enclosure (1). Heat dissipation mechanism (6) is installed on both sides of the inner cavity of the box (1). Liquid limiting plate (9) is fixedly connected between the heat dissipation mechanisms (6). A guide tube (10) is fixedly installed on the top of the liquid limiting plate (9). Cooling mechanism (7), which is mounted on heat dissipation mechanism (6); The cooling mechanism (7) includes an oil-passing bend (71), which is located inside the heat dissipation mechanism (6). The oil inlet of the oil-passing bend (71) passes through the heat dissipation mechanism (6) and extends to its outer side. The oil outlet of the oil-passing bend (71) passes through the heat dissipation mechanism (6) and extends to its bottom. The oil inlet of the oil-passing bend (71) is rotated by a shaft to a sealing plate (72) installed thereon. A one-way valve (73) is installed at the oil outlet of the oil-passing bend (71). A cooling drive (74) is installed on the outer surface of the sealing plate (72). The cooling drive (74) is located inside the guide tube (10).

2. The outdoor oil-immersed transformer with heat dissipation as described in claim 1, characterized in that: The cooling drive component (74) includes a float (741) and a connecting plate (745). The float (741) is located inside the guide tube (10). An elastic rope (747) is fixedly installed at the axis at the bottom of the float (741). A limit plate (748) is fixedly installed at the bottom end of the elastic rope (747).

3. An outdoor oil-immersed transformer with convenient heat dissipation according to claim 2, characterized in that: Levers (742) are rotatably mounted on both ends of the connecting plate (745). The other end of the lever (742) is rotatably mounted on the outer surface of the sealing plate (72) via a rotating shaft. A through hole (746) is opened on the surface of the connecting plate (745). The elastic rope (747) is set inside the through hole (746). The limiting piece (748) is squeezed and adapted to the bottom of the connecting plate (745).

4. An outdoor oil-immersed transformer with convenient heat dissipation according to claim 3, characterized in that: A support rod (743) is rotatably mounted at the fulcrum of the lever (742), and a rod holder (744) is mounted on the outer surface of the support rod (743). The rod holder (744) is fixedly mounted at the bottom of the liquid limiting plate (9).

5. An outdoor oil-immersed transformer with convenient heat dissipation according to claim 4, characterized in that: The bottom of the liquid limiting plate (9) is provided with a limiting ring groove (12), which is located directly below the guide tube (10). The limiting ring groove (12) is squeezed and adapted to the lever (742).

6. An outdoor oil-immersed transformer with convenient heat dissipation according to claim 5, characterized in that: A retaining ring (11) is fixedly installed at the bottom of the inner wall of the guide tube (10), and the retaining ring (11) is squeezed and adapted to the bottom of the float (741).

7. An outdoor oil-immersed transformer with convenient heat dissipation according to claim 1, characterized in that: The heat dissipation mechanism (6) includes an L-shaped partition (61), which is fixedly installed on the inner wall of the box (1). A ventilation hole (62) is provided on the top of the outer surface of the L-shaped partition (61). The outer surface and bottom surface of the L-shaped partition (61) are respectively provided with mounting hole one (63) and mounting hole two (64). The two ends of the oil passage bend (71) are respectively set in mounting hole one (63) and mounting hole two (64).

8. An outdoor oil-immersed transformer with easy heat dissipation according to claim 7, characterized in that: The outer surface of the L-shaped partition (61) is provided with strip-shaped heat dissipation holes (65). The strip-shaped heat dissipation holes (65) are staggered with the straight pipe section of the oil bend (71). A self-adjusting heat dissipation component (66) is installed inside the strip-shaped heat dissipation holes (65). A second limiting strip (67) is fixedly installed on the outer curved surface of the L-shaped partition (61). The second limiting strip (67) is located below the strip-shaped heat dissipation holes (65).

9. An outdoor oil-immersed transformer with convenient heat dissipation according to claim 8, characterized in that: The self-adjusting heat sink (66) includes a rotating shaft (661), which is rotatably installed inside the strip-shaped heat sink (65). A heat sink plate (662) is fixedly installed on the outer surface of the rotating shaft (661). The heat sink plate (662) is inclined, and a sealing plate (664) is installed between the heat sink plate (662) and the inner wall of the strip-shaped heat sink (65).

10. An outdoor oil-immersed transformer with easy heat dissipation according to claim 9, characterized in that: One end of the heat sink (662) is fixedly installed with a limiting strip (663), which is squeezed and adapted to the limiting strip (67). The other end of the heat sink (662) is fixedly connected with a return spring (665) between it and the inner curved surface of the L-shaped partition (61). The return spring (665) is evenly distributed on the outer surface of the heat sink (662).

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