Dry-type transformer with overload protection function

Abstract

The application discloses a dry-type transformer with an overload protection function, and relates to the technical field of dry-type transformers.The dry-type transformer comprises a base, a high-voltage coil, an annular pipe, a blowing part, a heat-sensitive driving assembly, a hollow support and an elastic sheet.The blowing part is additionally provided with an airflow triggering assembly.The hollow support is driven to rotate under the action of airflow, so that the elastic sheet is stored or expanded.The heat-sensitive driving assembly is arranged in the application, and the temperature change on the inner side of the high-voltage coil is sensed by using the characteristic that the air bag expands under the action of heat.When the transformer is overloaded and the heat accumulates on the inner side, the air bag expands to drive the blowing part to automatically swing towards the inner side of the high-voltage coil.This mechanism solves the problem that the side blowing is difficult to enter the inner side of the coil in the prior art, realizes directional reinforcement heat dissipation of the high-temperature area, effectively reduces the temperature difference between the inner side and the outer side of the coil, reduces the risk of cracking of the insulation layer caused by thermal stress, and thus prolongs the service life of the transformer and improves the safety.

Description

Technical Field

[0001] This invention relates to the field of dry-type transformer technology, specifically to a dry-type transformer with overload protection function. Background Technology

[0002] Dry-type transformers are a type of transformer that does not rely on insulating fluids for cooling and insulation. Their core structure consists of an iron core and windings, and heat dissipation is achieved through natural air cooling or forced air cooling. Compared to oil-immersed transformers, dry-type transformers offer higher safety and environmental friendliness because they do not require insulating oil, avoiding the fire risks and environmental pollution problems caused by oil leaks. They are widely used in locations with strict fire and explosion protection requirements, such as high-rise buildings, subways, airports, and data centers.

[0003] In existing technologies, dry-type transformers typically use cross-flow cooling fans to dissipate heat from the high-voltage coil. The fans are generally installed on one side of the high-voltage coil, and the resulting airflow blows towards the outer surface of the coil. However, the inventors have discovered that due to the narrow airflow channels and high air resistance inside the high-voltage coil, existing side-blowing methods are insufficient to effectively deliver cool air into the coil. This leads to severe heat accumulation inside the high-voltage coil under high-current overload conditions, which cannot be dissipated in time. This results in a significant temperature difference between the inside and outside of the coil, generating substantial thermal stress. Over time, this can easily cause insulation layer cracking, severely impacting the transformer's service life and safety. Therefore, there is an urgent need for a dry-type transformer cooling device that can effectively enhance heat dissipation from the inside of the high-voltage coil and reduce the temperature difference between the inside and outside. Summary of the Invention

[0004] The purpose of this invention is to provide a dry-type transformer with overload protection function to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a dry-type transformer with overload protection function, including a base and a high-voltage coil mounted on the base, an annular tube is provided below the high-voltage coil, a plurality of air blowing parts are connected to the annular tube, and a thermal drive component is also provided on the annular tube to sense the temperature of the high-voltage coil and drive the air blowing parts to swing. The blower section is equipped with a hollow bracket that rotates inside. An elastic sheet is connected to the hollow bracket. The blower section is also equipped with an airflow triggering component. The airflow triggering component drives the hollow bracket to rotate under the action of airflow, so that the elastic sheet can be retracted or opened.

[0006] Furthermore, the thermal drive assembly includes a fixed post fixed on the annular tube, a sliding part slidably fitted on the fixed post, and an airbag mounted on the fixed post. A hinge rod is hinged between the sliding part and the blowing part. When the airbag expands due to heat, it pushes the sliding part to move. The sliding part pulls the blowing part to swing through the hinge rod.

[0007] Furthermore, a protrusion is fixedly connected to the annular tube, and a rotating part is rotatably fitted onto the protrusion. The blowing part is fixedly connected to the rotating part and communicates with the annular tube. A return spring is fitted onto the fixed column, and the return spring elastically abuts against the sliding part to keep the outlet of the blowing part at its initial angle.

[0008] Furthermore, the airflow triggering component includes a floating column that slides through the blowing section, a floating plate fixed around the periphery of the floating column, and a drive spring connecting the floating column and the hollow bracket. The floating column is provided with a spiral rolling groove, and the blowing part is provided with a ball bearing that rolls and engages with the spiral rolling groove. When the airflow pushes the floating plate to move upward, the floating column moves axially and rotates under the cooperation of the spiral rolling groove and the ball bearing, thereby driving the hollow bracket to rotate through the drive spring.

[0009] Furthermore, a fixed plug is fixedly installed inside the blower section, the floating column slides through the fixed plug, a sealing part is fixedly connected to the floating plate, and a vent hole is opened on the fixed plug for the sealing part to be inserted. In the initial state, the sealing part blocks the vent hole, and the airflow pressure pushes the floating plate to move up so that the sealing part is disengaged from the vent hole.

[0010] Furthermore, the floating column is keyed to the hollow bracket, the floating plate is keyed to the inner wall of the air blowing part, and the floating plate is rotatably connected to the periphery of the floating column.

[0011] Furthermore, the blowing part is provided with a winding groove and a storage groove communicating with the winding groove. The elastic sheet is stored in the winding groove. A connecting pin is fixed to the hollow bracket. One end of the elastic sheet passes through the storage groove and is rotatably connected to the connecting pin.

[0012] Furthermore, the elastic sheet is naturally curved, and a water-absorbing film is adhered to the elastic sheet. When the hollow bracket rotates, the connecting pin drives the elastic sheet to retract into the winding groove or extend out of the storage groove and open.

[0013] Furthermore, a fan is installed on the base, an air-gathering hood is installed on the fan, a connecting pipe is connected to the air-gathering hood, the connecting pipe is connected to a closed horizontal pipe, and the closed horizontal pipe is connected to multiple annular pipes through a connecting pipe.

[0014] Furthermore, the annular tube is coaxially arranged with the high-voltage coil, and a plurality of the blowing sections are arrayed along the center line of the annular tube.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. In this invention, a thermally sensitive driving component (airbag, sliding part, hinge rod, etc.) is used to sense temperature changes inside the high-voltage coil by utilizing the thermal expansion characteristic of the airbag. When the transformer is overloaded and heat accumulates inside, the airbag expands, driving the blower to automatically swing towards the inside of the high-voltage coil. This mechanism solves the problem in existing technologies where side-blowing air is difficult to enter the inside of the coil, achieving targeted and enhanced heat dissipation in high-temperature areas, effectively reducing the temperature difference between the inside and outside of the coil, reducing the risk of insulation layer cracking due to thermal stress, thereby extending the transformer's lifespan and improving safety.

[0016] 2. In this invention, when the high-voltage coil temperature is normal, the blowing section maintains its initial angle or stops blowing; the blowing angle is automatically adjusted only when the temperature rises. This passive mechanical temperature sensing regulation method does not require additional electronic sensors and control circuits, has a simple and reliable structure, and avoids ineffective airflow consumption under non-overload conditions, thus contributing to energy saving.

[0017] 3. In this invention, through the cooperation of the airflow triggering components (floating column, spiral groove, hollow bracket, etc.) and the elastic sheet, when a small amount of condensation occurs at the orifice in the blowing section, the annularly bonded film will rapidly draw in the water droplets at the edge of the orifice using capillary action and diffuse them along the film. This prevents water droplets from dripping or remaining at the orifice under gravity, forming a "water film blockage," and acts like a "water guide channel," keeping the orifice dry and ensuring the long-term effectiveness of the heat dissipation system.

[0018] 4. In this invention, when the fan starts and generates airflow, the airflow pushes the floating column to move. The linear motion is converted into rotational motion through the spiral groove structure, driving the hollow bracket to rotate, thereby winding and storing the elastic sheet. This process not only opens the air outlet channel, but also uses the winding action of the elastic sheet to scrape off or collect adsorbed dust, achieving automatic cleaning of the orifice in the blower section and preventing dust accumulation from affecting the air outlet efficiency.

[0019] 5. In this invention, the air passage is normally closed by using the plug-in connection between the sealing part on the floating plate and the vent hole. Only when the fan starts and the air pressure reaches a certain value is the sealing part opened to allow airflow. This design not only ensures the directional flow of cooling airflow and prevents air pressure loss, but also further enhances the sealing and moisture-proof effect when the machine is shut down.

[0020] 6. In this invention, by setting the annular tube coaxially with the high-voltage coil and distributing multiple air blowers in a circumferential array, it is ensured that cold air can enter the inner air duct evenly from below the coil, avoiding local overheating and improving the uniformity of the overall heat dissipation effect. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of a dry-type transformer with overload protection function according to the present invention; Figure 2 for Figure 1 A schematic diagram showing the positional relationship of the structure from another perspective; Figure 3 This is a schematic diagram showing the positional relationship of the annular pipe, the fan, and the closed horizontal pipe after assembly in this invention; Figure 4 This is a schematic diagram showing the positional relationship of the annular tube, the blowing part, and the fixing column after assembly in this invention; Figure 5 for Figure 4 A schematic diagram showing the positional relationship of the middle section after it has been cut open; Figure 6 for Figure 5 A magnified schematic diagram of the positional relationship of a local structure at point A in the middle; Figure 7 This is a schematic diagram showing the positional relationship between the blowing part and the rotating part after assembly in this invention; Figure 8 for Figure 7 A schematic diagram showing the positional relationship of the middle section after it has been cut open; Figure 9 for Figure 8 A magnified schematic diagram of the positional relationship of the local structure at point B in the middle section; Figure 10 for Figure 7 Schematic diagram of the positional relationships of the central structure after explosive decomposition; Figure 11 This is a schematic diagram showing the positional relationship of the blower section after it has been cut open in this invention.

[0022] The following are explanations of the reference numerals in the figures: 1. High-voltage coil; 2. Ring tube; 3. Base; 4. Fan; 5. Gas-gathering hood; 6. Connecting pipe; 7. Enclosed horizontal tube; 8. Protrusion; 9. Fixing sleeve; 10. Blowing part; 11. Hinge rod; 12. Fixing column; 13. Elastic sheet; 14. Floating plate; 15. Sliding part; 16. Stop ring; 17. Return spring; 18. Airbag; 19. Floating column; 20. Fixing plug; 21. Drive spring; 22. Hollow bracket; 23. Rotating part; 24. Winding groove; 25. Sealing part; 26. Spiral rolling groove; 27. Ball bearing; 28. Vent hole; 29. ​​Connecting pin; 30. Storage groove. 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] Please see Figures 1-11 This invention provides a technical solution: a dry-type transformer with overload protection function, comprising a base 3 of the dry-type transformer and multiple high-voltage coils 1 mounted on the base 3. Cooling channels are provided between the inner side of the high-voltage coils 1 and the iron core. A fan 4 is mounted on the base 3, and an air-gathering shroud 5 is mounted on the fan 4. A connecting pipe 6 is fixedly connected to the surface of the air-gathering shroud 5. The fan blades of the fan 4 are located inside the air-gathering shroud 5. When the fan blades rotate, airflow is generated, and the airflow enters the connecting pipe 6. A closed horizontal pipe 7 is connected to the end of the connecting pipe 6 away from the fan 4. Multiple connecting pipes pass through the wall of the closed horizontal pipe 7. Multiple annular tubes 2 are connected, each annular tube 2 is located below the high-voltage coil 1 and is coaxial with the high-voltage coil 1. In addition, the annular tube 2 is a closed tubular structure, and multiple protrusions 8 are fixed to the tube wall of the annular tube 2. The protrusions 8 are provided with connecting holes that communicate with the annular tube 2. In addition, a rotating part 23 is rotatably embedded in the protrusion 8. The rotating part 23 can rotate freely in the protrusion 8. Specifically, the rotating part 23 is a spherical structure, and a spherical groove adapted to the outer contour of the rotating part 23 is opened in the protrusion 8. The rotating part 23 can rotate freely in the spherical groove. Combination Figures 1 to 11 As shown, and please refer to the following: Figure 6A blowing part 10 is fixedly connected to the spherical surface of the rotating part 23. The blowing part 10 has a tubular structure, and its central hole penetrates the rotating part 23 and communicates with the connecting hole of the protrusion 8. In addition, a fixing post 12 is fixedly connected to the wall of the annular tube 2. A fixing sleeve 9 is fixedly fitted onto one end of the fixing post 12 adjacent to the annular tube 2. The fixing sleeve 9 has a blind hole-shaped mounting cavity at one end facing the center of the annular tube 2. An airbag 18 is installed in the mounting cavity and is filled with compressed air, causing the airbag 18 to expand. When the fixing sleeve 9 is heated, the heat on the fixing sleeve 9 is transferred to the airbag 18, causing the compressed air in the airbag 18 to expand, further expanding the volume of the airbag 18. The fixing sleeve 9 is located inside the high-voltage coil 1. When the high-voltage coil 1 generates a large current overload, the heat inside the high-voltage coil 1 accumulates quickly and is transferred to the... The fixed sleeve 9 then transmits the air to the airbag 18, causing the airbag 18 to expand. A sliding part 15 is slidably fitted on the periphery of the fixed column 12. The sliding part 15 can slide freely on the periphery of the fixed column 12. One end of the sliding part 15 passes through the central hole of the fixed sleeve 9 and is hinged to a hinge rod 11. The end of the hinge rod 11 away from the sliding part 15 is hinged to the periphery of the blowing part 10. When the airbag 18 expands, it will generate a thrust on the sliding part 15, causing the sliding part 15 to move towards the center side of the annular tube 2. When the sliding part 15 moves, it will cause the hinge rod 11 to pull the blowing part 10 to swing, thereby causing the blowing part 10 to rotate around the rotating part 23 as the rotation fulcrum, so that the mouth of the blowing part 10 faces the inside of the high voltage coil 1. In the initial state, the mouth of the blowing part 10 is located in the middle position between the inside and outside of the high voltage coil 1. Combination Figures 1 to 11 As shown, and please refer to the following: Figure 6 A stop ring 16 is fixedly sleeved at the end of the fixed post 12 away from the fixed sleeve 9. A return spring 17 is provided between the stop ring 16 and the sliding part 15. Specifically, the return spring 17 is wrapped around the periphery of the fixed post 12, and the two ends of the return spring 17 elastically abut against the sliding part 15 and the stop ring 16 respectively in the direction of the elastic force. In the initial state, the return spring 17 has an elastic abutting force on the sliding part 15 in the direction of the outer side of the annular tube 2, so that the sliding part 15 drives the hinge rod 11 to drive the blowing part 10 to swing, so that the blowing part 10... The opening of the airbag 18 is located in the middle of the inner and outer sides of the high-voltage coil 1 (or between the inner and outer sides). When the volume of the airbag 18 expands, the sliding part 15 will overcome the elastic resistance of the return spring 17 and move away from the blowing part 10. The blowing part 10 will be pulled by the hinge rod 11 and deflected towards the inner side of the high-voltage coil 1. In addition, in this embodiment, multiple protrusions 8 are arranged in an array along the center line of the annular tube 2, so that multiple blowing parts 10 on the annular tube 2 are evenly distributed below the high-voltage coil 1. Combination Figures 1 to 11As shown, and please refer to the following: Figure 8 , Figure 9 and Figure 10 A hollow bracket 22 is rotatably connected to the inner wall of the blower section 10. Specifically, an annular locking block is coaxially fixed to the periphery of the hollow bracket 22. An annular groove for the annular locking block to engage is opened in the inner wall of the central hole of the blower section 10. The annular locking block rotates freely in the annular groove, thereby allowing the hollow bracket 22 to be rotatably connected to the blower section 10. A connecting pin 29 is vertically fixed to the upper end face of the hollow bracket 22. A winding groove 24 is opened on the upper side of the blower section 10. The cross-section of the winding groove 24 is annular. In addition, a receiving groove 30 communicating with the winding groove 24 is opened in the central hole wall of the blower section 10. An elastic sheet 13 is installed in the winding groove 24. The elastic sheet 13 is in an elastically bent state in its natural state. One end of the elastic sheet 13 passes through the receiving groove 30 into the winding groove 24, and the other end passes through the receiving groove 30 and is rotatably connected to the connecting pin 29. The elastic sheet 13 has a winding part at one end that protrudes from the storage groove 30. The winding part is fitted onto the connecting pin 29 and can rotate freely. A thin film (not shown in the figure) is adhered to the side of the elastic sheet 13 that is in contact with the inner wall of the blowing part 10. The film is made of a water-absorbing material and has a water-absorbing effect. When the elastic sheet 13 protrudes from the storage groove 30, due to its own elastic deformation, the elastic sheet 13 naturally expands and bends, and the elastic sheet 13 is in contact with the inner wall of the blowing part 10. This allows the film to be in contact with the inner wall of the blowing part 10. That is, when the hollow bracket 22 rotates circumferentially in the inner cavity of the blowing part 10, the connecting pin 29 will rotate about the axis of the blowing part 10. When rotating, the connecting pin 29 will pull the end of the elastic sheet 13 that protrudes from the storage groove 30 to rotate circumferentially, thereby allowing the elastic sheet 13 to protrude from the storage groove 30. Combination Figures 1 to 11 As shown, and please refer to the following: Figure 8 , Figure 9 and Figure 10A fixed plug 20 is fixedly installed in the central hole of the blower section 10. A floating column 19 is coaxially inserted through the fixed plug 20. A sliding hole is coaxially opened on the end face of the fixed plug 20 to allow the floating column 19 to pass freely. The floating column 19 can slide freely in the sliding hole of the fixed plug 20. The upper end of the floating column 19 is inserted through the hollow bracket 22 and is keyed to the hollow bracket 22. The floating column 19 can slide vertically and freely on the hollow bracket 22. When the floating column 19 rotates, it can drive the hollow bracket 22 to rotate circumferentially. Two ball bearings 27 are rotatably embedded in the wall of the sliding hole. Two spiral rolling grooves 26 are formed around the periphery of the moving column 19. Two balls 27 roll in the two spiral rolling grooves 26 respectively, which will cause the balls 27 to drive the floating column 19 to rotate. A floating plate 14 is rotatably sleeved around the periphery of the floating column 19. Specifically, two limiting rings (not shown in the figure) are fixedly sleeved around the periphery of the floating column 19. The two limiting rings slide in contact with the upper and lower surfaces of the floating plate 14 respectively, thereby limiting the floating plate 14 along the axial direction of the floating column 19. The floating plate 14 can rotate, so that the floating plate 14 is rotatably connected to the periphery of the floating column 19. A sealing part 25 is vertically fixed to each side of the floating plate 14. The end face of the fixed plug 20 is provided with a vent hole 28 for the sealing part 25 to be inserted. The sealing part 25 and the vent hole 28 are in sliding fit. When there is compressed air with a certain pressure in the annular tube 2, the compressed air will push the sealing part 25 to move, so that the sealing part 25 slides in the vent hole 28 and drives the sealing part 25 to disengage from the insertion state with the vent hole 28. This allows the compressed air to enter the middle hole of the blower 10 from the vent hole 28. Furthermore, the floating plate 14 is keyed to the hole wall of the middle hole of the blower 10, so that the floating column 19 will not drive the floating plate 14 to rotate when it rotates. In addition, a drive spring 21 is also wrapped around the periphery of the floating column 19. The two ends of the drive spring 21 elastically abut against the floating plate 14 and the hollow bracket 22 respectively in the direction of the elastic force. When the floating plate 14 moves upward, it will compress the drive spring 21, so that the drive spring 21 accumulates elastic potential energy.

[0025] Working principle of the invention: When the blower 4 starts, it generates airflow. The airflow enters the closed horizontal pipe 7 through the connecting pipe 6, and then enters multiple annular pipes 2. The compressed air formed by the airflow has a certain pressure, which can generate a thrust on the sealing part 25, causing the sealing part 25 to move upward and disengage from the insertion state with the vent hole 28. This allows the airflow to push the sealing part 25, and then enter the central hole of the blowing part 10 through the vent hole 28. Subsequently, it is blown from the central hole of the blowing part 10 towards the high-voltage coil 1, and the sealing part 25 moves upward. When moving, it will drive the floating plate 14 to move upward, which will cause the floating plate 14 to drive the floating column 19 to move upward. When the floating column 19 moves upward, it will cause the ball 27 to roll in the spiral rolling groove 26, thereby driving the floating column 19 to rotate. When the floating column 19 rotates, since the floating column 19 and the hollow bracket 22 are connected by a key, it will drive the hollow bracket 22 to rotate. When the hollow bracket 22 rotates, it will cause the connecting pin 29 to rotate and cause the elastic piece 13 to retract into the winding groove 24. When the temperature inside the high-voltage coil 1 rises sharply, the heat is transferred to the fixed sleeve 9. Through heat transfer, the gas in the airbag 18 expands in volume due to heat, and drives the sliding part 15 to move towards the center of the annular tube 2. This causes the sliding part 15 to drive the hinge rod 11 to swing, which in turn causes the hinge rod 11 to pull the blowing part 10 to swing, causing the mouth of the blowing part 10 to swing towards the inside of the high-voltage coil 1, thereby increasing the cooling rate of the inside of the high-voltage coil 1. When the ambient temperature of the high-voltage coil 1 drops, the fan 4 can stop cooling the high-voltage coil 1 to achieve energy saving. When the fan 4 stops running, the airflow in the annular pipe 2 weakens to disappear, thereby releasing the elastic potential energy of the drive spring 21 and driving the floating plate 14 to move downward. This causes the sealing part 25 on the floating plate 14 to re-insert into the vent hole 28. At the same time, the floating column 19 also moves downward with the floating plate 14, causing the ball 27 to roll in the opposite direction in the spiral rolling groove 26 and causing the hollow bracket 22 to rotate in the opposite direction. The connecting pin 29 pulls on the elastic sheet 13, causing the elastic sheet 13 to pass through the storage groove 30. Due to its own elastic expansion and deformation, the elastic sheet 13 is in an open state, allowing the film to cover the inner surface of the air blower 10 and form a ring. The film is made of water-absorbing material, which can reduce the accumulation of moisture on the inner surface of the air blower 10.

[0026] It should be noted that, in this document, relational terms such as "first" and "second" are used merely 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. 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 variations 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. A dry-type transformer with overload protection function, comprising a base (3) and a high-voltage coil (1) mounted on the base (3), characterized in that, Below the high-voltage coil (1) is an annular tube (2), and several air blowing parts (10) are connected to the annular tube (2). The annular tube (2) is also provided with a thermal drive component that senses the temperature of the high-voltage coil (1) and drives the air blowing parts (10) to swing. The blower (10) is rotatably mounted with a hollow bracket (22), and an elastic sheet (13) is connected to the hollow bracket (22). The blower (10) is also provided with an airflow triggering component. The airflow triggering component drives the hollow bracket (22) to rotate under the action of airflow, so that the elastic sheet (13) can be retracted or opened.

2. A dry-type transformer with overload protection function according to claim 1, characterized in that, The thermal drive assembly includes a fixed column (12) fixed on the annular tube (2), a sliding part (15) slidably fitted on the fixed column (12), and an airbag (18) mounted on the fixed column (12). A hinge rod (11) is hinged between the sliding part (15) and the blowing part (10). When the airbag (18) expands due to heat, it pushes the sliding part (15) to move. The sliding part (15) pulls the blowing part (10) to swing through the hinge rod (11).

3. A dry-type transformer with overload protection function according to claim 2, characterized in that, A protrusion (8) is fixedly connected to the annular tube (2), and a rotating part (23) is rotatably fitted on the protrusion (8). The blowing part (10) is fixedly connected to the rotating part (23) and communicates with the annular tube (2). A return spring (17) is fitted on the fixed column (12). The return spring (17) elastically abuts against the sliding part (15) so that the outlet of the blowing part (10) maintains the initial angle.

4. A dry-type transformer with overload protection function according to claim 1, characterized in that, The airflow triggering assembly includes a floating column (19) that slides through the blowing section (10), a floating plate (14) fixed around the floating column (19), and a driving spring (21) that connects the floating column (19) and the hollow bracket (22). The floating column (19) is provided with a spiral rolling groove (26), and the blowing part (10) is provided with a ball (27) that rolls in the spiral rolling groove (26). When the airflow pushes the floating plate (14) to move upward, the floating column (19) moves axially and rotates under the cooperation of the spiral rolling groove (26) and the ball (27), thereby driving the hollow bracket (22) to rotate through the driving spring (21).

5. A dry-type transformer with overload protection function according to claim 4, characterized in that, A fixed plug (20) is fixedly installed inside the blower (10). The floating column (19) slides through the fixed plug (20). A sealing part (25) is fixedly connected to the floating plate (14). A vent hole (28) is opened on the fixed plug (20) for the sealing part (25) to be inserted. In the initial state, the sealing part (25) blocks the vent hole (28). The airflow pressure pushes the floating plate (14) to move upward, causing the sealing part (25) to disengage from the vent hole (28).

6. A dry-type transformer with overload protection function according to claim 4, characterized in that, The floating column (19) is keyed to the hollow bracket (22), the floating plate (14) is keyed to the inner wall of the blowing part (10), and the floating plate (14) is rotatably connected to the periphery of the floating column (19).

7. A dry-type transformer with overload protection function according to claim 1, characterized in that, The blowing part (10) is provided with a winding groove (24) and a storage groove (30) communicating with the winding groove (24). The elastic sheet (13) is stored in the winding groove (24). A connecting pin (29) is fixedly connected to the hollow bracket (22). One end of the elastic sheet (13) passes through the storage groove (30) and is rotatably connected to the connecting pin (29).

8. A dry-type transformer with overload protection function according to claim 7, characterized in that, The elastic sheet (13) is bent in its natural state. A water-absorbing film is adhered to the elastic sheet (13). When the hollow bracket (22) rotates, the connecting pin (29) drives the elastic sheet (13) to retract into the winding groove (24) or to extend out of the storage groove (30).

9. A dry-type transformer with overload protection function according to claim 1, characterized in that, A fan (4) is installed on the base (3), a gas gathering hood (5) is installed on the fan (4), a connecting pipe (6) is connected to the gas gathering hood (5), a closed horizontal pipe (7) is connected to the connecting pipe (6), and the closed horizontal pipe (7) is connected to multiple annular pipes (2) through the connecting pipe.

10. A dry-type transformer with overload protection function according to claim 1, characterized in that, The annular tube (2) is coaxially arranged with the high-voltage coil (1), and a plurality of the blowing parts (10) are arranged in an array along the center line of the annular tube (2).

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