A passive oil-immersed transformer capable of increasing heat dissipation effect

Abstract

The application relates to the technical field of transformer cooling, in particular to a passive oil-immersed transformer capable of increasing the heat dissipation effect, which comprises a transformer body, the transformer body comprises a box body, heat dissipation fins are arranged around the box body, two clamping pieces are arranged in the box body, an iron core is connected in the two clamping pieces, a winding is arranged on the outer side of the iron core, and a partitioned drainage assembly is arranged on the outer side of the winding. The application realizes partitioning of the insulating oil of the winding through the horn-shaped flow guide cover, introduces the 'cold' oil into the bottom end of the upper half area, increases the heat exchange temperature difference with the winding in the upper half area, and thus improves the cooling effect; the grid arranged in the horn-shaped flow guide cover forms multiple independent oil channel parts on the outer side of the winding, and the setting of the communication of the independent oil channel parts with one or more drainage pipes forms the chimney effect, and the chimney effect is more obvious with the greater temperature difference.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of transformer cooling, in particular to a passive oil-immersed transformer capable of increasing heat dissipation effect. BACKGROUND

[0002] In the field of transformers, the hot zone is a local position inside the power transformer where the temperature is significantly higher than that of other adjacent regions. The reason for its formation is that the magnetic lines of force at the winding end will diverge, bend and concentrate, generating greater eddy current loss and stray loss, resulting in increased heat generation in these regions. At the same time, the insulating oil has become hot oil with a higher temperature after heat exchange through the lower half of the winding, and the hot oil from bottom to top will cause the upper half of the winding to overheat, and the heat exchange effect is poor. At the same time, the hot zone will form a thermal boundary layer due to the excessively high temperature, and the heat of the upper half of the winding cannot be effectively taken away, hindering the heat transfer to the main stream of oil.

[0003] Long-term high temperature will make the transformer prone to insulation breakdown, and thus cause equipment defects and faults of the transformer. In order to ensure the long-term stable operation of the transformer, we propose a passive oil-immersed transformer capable of increasing heat dissipation effect to solve the above problems. SUMMARY

[0004] The present application aims to provide a passive oil-immersed transformer capable of increasing heat dissipation effect to solve the problems raised in the background.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a passive oil-immersed transformer capable of increasing heat dissipation effect, comprising a transformer body, the transformer body comprising a box body, the box body being provided with heat dissipation fins around, the box body being provided with two clamps arranged in upper and lower positions, the two clamps being connected with an iron core, the iron core being provided with a winding outside, and the winding being provided with a partitioned flow guide assembly outside.

[0006] The partitioned flow guide assembly comprises a horn-shaped flow guide cover, the horn-shaped flow guide cover being divided into a flow guide curved surface part and a neck part from top to bottom, the horn-shaped flow guide cover being provided with a plurality of gratings inside, the interior of the horn-shaped flow guide cover being formed with a plurality of independent oil channel parts through the gratings, the bottom of the independent oil channel part being connected with one or more flow guide pipes, a chimney effect being formed from the bottom to the upper part, and a flow disturbance assembly being arranged on the sidewall of the independent oil channel part for destroying the thermal boundary layer.

[0007] The neck part of the horn-shaped flow guide cover and the inner sidewall of the grating are in close contact with the winding, and the flow guide curved surface part of the horn-shaped flow guide cover gradually diverges away from the winding from bottom to top.

[0008] More preferably, the spoiler assembly includes a fairing, which is disposed on the guide arc surface. The guide arc surface has multiple movable windows. A rotating shaft is rotatably connected to the fairing. A spoiler is fixedly sleeved on the outside of the rotating shaft. The inner side of the spoiler extends into the movable windows and is close to the outer side of the winding. A reciprocating drive torque-increasing assembly is connected to the outer side of the spoiler.

[0009] In a further preferred embodiment, the reciprocating drive torque-increasing component includes a reciprocating lead screw, the two ends of which are rotatably connected to the fairing. A slider is slidably connected to the outer side of the reciprocating lead screw, and a lever is fixedly connected to the inner side of the slider. The lever is slidably connected to a groove on the reciprocating lead screw. The slider drives the spoiler to swing back and forth through the unidirectional rotation of the reciprocating lead screw. A swing distance compensation and limiting component is also connected to the slider.

[0010] In a further preferred embodiment, a round rod is rotatably connected inside the fairing, with both ends of the round rod extending outside the fairing and fixedly connected to multiple blades. A second gear is fixedly connected to the outside of the round rod, and a first gear is fixedly connected to the outside of both ends of the reciprocating screw. The first gear meshes with the second gear, and the diameter of the first gear is larger than the diameter of the second gear. The torque is increased by driving the larger diameter gear through the smaller diameter gear.

[0011] In a further preferred embodiment, the swing distance compensation limiting component includes a connecting block, which is fixedly connected to the outside of the spoiler. A limiting groove is formed inside the connecting block. Two side ears are fixedly connected to the inner side of the slider. A limiting post is fixedly connected between the two side ears. The limiting post is slidably connected to the limiting groove.

[0012] In a further preferred embodiment, a slide rail is fixedly connected to the inner wall of the outer side of the fairing, and a groove is provided on the outer side of the slider, with the slide rail slidably connected to the inner wall of the groove.

[0013] More preferably, the blade includes a flow-facing section, a flow-following section, and a bevel section. The flow-facing section is concave to increase the flow-facing area, the flow-following section is arc-shaped and convex, and the end is provided with a bevel section to reduce fluid resistance.

[0014] In a further preferred embodiment, the drain pipe is located at the neck of the flared air guide and is connected to the independent oil passage section. The bottom end of the drain pipe is inclined in an outward diffusion shape, so that the oil inlet at the bottom end of the drain pipe can drain the cold oil from the heat dissipation fins.

[0015] In a further preferred embodiment, the connection between the rotating shaft and the spoiler is located in the outer half of the spoiler, forming a lever that requires less effort to increase the swing amplitude.

[0016] In a further preferred embodiment, the connection between the rotating shaft and the spoiler is located in the outer half of the spoiler, forming a lever that requires less effort to increase the swing amplitude.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. The present invention provides a horn-shaped flow guide on the outside of each winding. The horn-shaped flow guide is located in the upper half of the winding, thereby separating the working area from the lower half. During operation, after the insulating oil passes through the lower half for heat exchange, the oil temperature rises and the density decreases. The hotter oil rises to form an oil flow. The temperature of the insulating oil in the upper half also rises. Under the effect of the chimney effect, the several channels separated by the grid can accelerate convection and form an upward oil flow. A low-pressure area is formed at the neck of the horn-shaped flow guide. The bottom end of the drain pipe connected to the bottom of the neck is inclined in an outward diffusion shape. Under the effect of the chimney effect, the "cold" oil at the bottom of the drain pipe is directly introduced into the horn-shaped flow guide on the upper side of the winding, increasing the heat exchange temperature difference and greatly improving the cooling effect of the upper half.

[0019] 2. In this invention, the hot oil that has undergone heat exchange in the lower half of the circuit rises along the guide arc surface on the outside of the trumpet-shaped guide shroud. The guide arc surface gradually moves away from the winding in a diffused manner from bottom to top, thereby avoiding contact between the hot oil that has already been heated at the bottom and the upper half of the winding. The outside of the trumpet-shaped guide shroud is heated by the external rising oil flow, which increases the chimney effect inside the independent oil passage section.

[0020] 3. The gradually expanding design of the trumpet-shaped flow guide in this invention avoids the eddies and flow separation that are easily generated when the outlet of the independent oil channel suddenly expands. If the flow channel suddenly expands, the oil flow will directly rush into a large cavity, generating eddies, backflow and flow separation. These eddies will dissipate kinetic energy through friction and collision. Eddies consume a lot of flow energy. The design of the trumpet-shaped flow guide can prevent hot oil from accumulating on the top of the winding, so that the hot oil is pushed closer to the heat dissipation fins under the action of kinetic energy, which accelerates the heat exchange efficiency and thus improves the efficiency of the entire cooling system.

[0021] 4. The present invention uses a grid installed inside the horn-shaped flow guide to divide the original annular oil channel into multiple independent oil channel sections. During the process of the insulating oil in the independent oil channel section becoming hot oil through heat conduction and rising, the presence of grids on both sides increases the flow rate of the oil due to the chimney effect, thereby accelerating the heat exchange rate.

[0022] 5. In this invention, the hot oil that has undergone heat exchange in the lower half of the circuit rises along the guide arc surface on the outside of the trumpet-shaped guide shroud. The insulating oil inside the trumpet-shaped guide shroud also forms a heat source after heat exchange in the upper half of the winding. This makes the temperature of the insulating oil on the outside of the guide arc surface greater than the temperature inside the independent oil channel. The greater the temperature difference, the faster the flow rate. The rising hot oil comes into contact with the flow-facing part of the blade. The flow-facing part is concave to increase the flow-facing area, while the flow-following part is arc-shaped and convex. The end is provided with a bevel to reduce fluid resistance. The rising hot oil drives the round rod to rotate. The diameter of the second gear fixed outside the round rod is smaller than the diameter of the first gear, thereby increasing the torque. The reciprocating screw drives the slider to move laterally back and forth, which also increases the torque. The lateral reciprocating movement of the slider drives the baffle to swing back and forth. The connection between the rotating shaft and the baffle is located in the outer half of the baffle, which can significantly disrupt the thermal boundary layer formed on the winding surface.

[0023] 6. In summary, this invention achieves zoned cooling of the winding's insulating oil through a trumpet-shaped flow guide. By introducing "cold" oil from the bottom of the upper zone, the heat exchange temperature difference with the upper winding is increased, thereby improving the cooling effect. The grid inside the trumpet-shaped flow guide creates multiple independent oil channels on the outer side of the winding. With one or more drainage pipes connecting these independent oil channels, a chimney effect is formed, which becomes more pronounced with a larger temperature difference. As the oil flows upward outside the trumpet-shaped flow guide, it drives the baffle to oscillate, disrupting the thermal boundary layer on the outer surface of the winding. Similarly, as the temperature rises, the oil flow velocity outside the trumpet-shaped flow guide increases, and the corresponding oscillation frequency of the baffle increases. Therefore, under the above configuration, this invention can effectively and precisely cool the hot areas of the winding through passive zoned flow guidance, greatly improving cooling efficiency and enhancing the stability of transformer operation. Attached Figure Description

[0024] Figure 1 This is a front-view three-dimensional structural schematic diagram of the present invention;

[0025] Figure 2 This is a front-view sectional view of the internal three-dimensional structure of the box body of the present invention;

[0026] Figure 3 This is a schematic diagram of the connection between the horn-shaped air guide and the winding of the present invention;

[0027] Figure 4 This is a top view of the internal structure of the trumpet-shaped air guide of the present invention;

[0028] Figure 5 This is a schematic diagram of the insulating oil flow on the outside of the horn-shaped flow guide cover of the present invention;

[0029] Figure 6 This is a schematic diagram of the internal structure of the fairing of the present invention;

[0030] Figure 7 This is a three-dimensional structural diagram of the connection between the reciprocating drive torque-increasing component and the spoiler of the present invention;

[0031] Figure 8 for Figure 7 Enlarged 3D structural diagram of area A in the middle.

[0032] In the diagram: 1. Transformer body; 11. Tank; 12. Windings; 13. Heat dissipation fins;

[0033] 2. Zoned flow diversion assembly; 21. Trumpet-shaped flow guide shroud; 211. Neck; 212. Flow guide arc section; 22. Grille; 221. Independent oil passage section; 23. Drainage pipe;

[0034] 3. Spoiler assembly; 31. Fairing; 32. Movable window; 33. Spoiler plate; 34. Rotating shaft;

[0035] 4. Reciprocating drive torque-increasing assembly; 41. Reciprocating lead screw; 42. Slider; 43. Pulley; 44. Round rod; 45. First gear; 46. Second gear; 47. Blade;

[0036] 5. Compensation and limiting component; 51. Connecting block; 52. Limiting groove; 53. Side lug; 54. Limiting post; 55. Groove; 56. Slide rail;

[0037] 6. Upstream section; 7. Downstream section; 8. Slope section. Detailed Implementation

[0038] The technical solutions in the embodiments of the present invention will be clearly and completely described below. 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.

[0039] Please refer to Example 1 Figures 1-8 The present invention provides a technical solution: a passive oil-immersed transformer that can increase heat dissipation effect, including a transformer body 1, the transformer body 1 including a housing 11, heat dissipation fins 13 are arranged around the housing 11, a winding 12 is arranged inside the housing 11, and a partitioned current diversion component 2 is sleeved on the outside of the winding 12.

[0040] In the above configuration, the present invention provides a horn-shaped flow guide shroud 21 on the outside of each winding 12. The horn-shaped flow guide shroud 21 is located in the upper half of the winding 12, thereby separating the working area from the lower half. During operation, after the insulating oil passes through the lower half for heat exchange, the oil temperature rises and the density decreases. The hot oil with higher temperature rises to form an oil flow. The temperature of the insulating oil in the upper half will also rise. Under the effect of the chimney effect, the several channels separated by the grid 22 can accelerate convection and form an upward oil flow. A low-pressure area is formed at the neck 211 of the horn-shaped flow guide shroud 21. The bottom end of the drain pipe 23 connected to the bottom of the neck 211 is inclined in an outward diffusion shape. Thus, under the chimney effect, the "cold" oil at the bottom end of the drain pipe 23 is directly introduced into the horn-shaped flow guide shroud 21 on the upper side of the winding, increasing the heat exchange temperature difference and greatly improving the cooling effect of the upper half.

[0041] Meanwhile, the hot oil that has undergone heat exchange in the lower half of the zone rises along the guide arc surface 212 on the outside of the trumpet-shaped guide shroud 21. The guide arc surface 212 gradually moves away from the winding 12 in a diffused manner from bottom to top, thereby avoiding contact between the hot oil that has been heated at the bottom and the upper half of the winding 12. The outside of the trumpet-shaped guide shroud 21 is heated by the external rising oil flow, increasing the chimney effect inside the independent oil passage section 221.

[0042] It should be further explained that the gradually expanding design of the horn-shaped flow guide shroud 21 avoids the eddies and flow separation that are easily generated when the outlet of the independent oil channel section 221 suddenly expands. If the flow channel suddenly expands, the oil flow will directly rush into a large cavity, generating eddies, backflow and flow separation. These eddies will dissipate kinetic energy through friction and collision. Eddies consume a lot of flow energy. The design of the horn-shaped flow guide shroud 21 can prevent hot oil from accumulating on the top of the winding 12, so that the hot oil is pushed closer to the heat dissipation fins 13 under the action of kinetic energy, which accelerates the heat exchange efficiency and thus improves the efficiency of the entire cooling system.

[0043] The partitioned flow diversion assembly 2 includes a horn-shaped flow guide shroud 21, which is divided into a flow guide arc section 212 and a neck 211. Multiple grids 22 are provided inside the horn-shaped flow guide shroud 21, which form multiple independent oil passages 221 inside the horn-shaped flow guide shroud 21 through the grids 22. One or more flow diversion pipes 23 are connected to the bottom of the independent oil passages 221, forming a chimney effect from bottom to top. A turbulence assemblies 3 are provided on the side walls of the independent oil passages 221 to disrupt the thermal boundary layer.

[0044] Under the above configuration, the original annular oil channel is divided into multiple independent oil channel sections 221 by the grid 22 provided in the horn-shaped guide shroud 21. During the process of the insulating oil in the independent oil channel section 221 rising as hot oil through heat conduction, the flow rate of the oil is accelerated due to the chimney effect caused by the presence of grid 22 on both sides, thereby accelerating the heat exchange rate.

[0045] It should be further explained that a wide oil gap can lead to an unclear oil flow path, which can easily generate large-scale eddies and flow dead zones. Eddies consume a lot of driving energy, but contribute little to effective cooling (carrying away heat vertically upwards), thus wasting the driving force of the chimney effect. The independent oil passage section 221 forces the oil flow to move along a clear, vertical path, suppressing the generation of transverse and useless eddies. This allows more of the driving force generated by the chimney effect to be used to propel the oil flow upwards, thereby increasing the flow velocity.

[0046] The neck 211 of the horn-shaped fairing 21 and the inner wall of the grille 22 are both in contact with the winding 12, and the flow-guiding arc surface 212 of the horn-shaped fairing 21 gradually moves away from the winding 12 from bottom to top in a diffused manner.

[0047] In this embodiment, specifically: the turret assembly 3 includes a fairing 31, which is disposed on the guide arc surface 212. The guide arc surface 212 has multiple movable windows 32. A rotating shaft 34 is rotatably connected to the fairing 31. A turret 33 is fixedly sleeved on the outside of the rotating shaft 34. The inner side of the turret 33 extends into the movable window 32 and is close to the outer side of the winding 12. A reciprocating drive torque-increasing assembly 4 is connected to the outer side of the turret 33.

[0048] Under the above configuration, during operation, the hot oil that has undergone heat exchange in the lower half of the circuit rises along the guide arc section 212 on the outside of the trumpet-shaped guide shroud 21. The insulating oil inside the trumpet-shaped guide shroud 21 also forms a heat source after heat exchange in the upper half of the winding 12, making the temperature of the insulating oil outside the guide arc section 212 higher than the temperature inside the independent oil channel section 221. The greater the temperature difference, the faster the flow rate. The rising hot oil comes into contact with the flow-facing part 6 of the blade 47. The flow-facing part 6 is concave to increase the flow-facing area, while the flow-following part 7 is arc-shaped and convex, with a bevel 8 at the end for reducing... With low fluid resistance, the rising hot oil drives the round rod 44 to rotate. The diameter of the second gear 46 fixed outside the round rod 44 is smaller than that of the first gear 45, thereby increasing the torque. The reciprocating screw 41 drives the slider 42 to move laterally back and forth, which also increases the torque. The lateral reciprocating movement of the slider 42 drives the spoiler 33 to swing back and forth. The connection between the rotating shaft 34 and the spoiler 33 is located in the outer half of the spoiler 33, which can significantly disrupt the thermal boundary layer formed on the surface of the winding 12.

[0049] It should be further explained that when the insulating oil flows over the surface of the winding 12, due to the fluid viscosity and thermal conduction, it will adhere to the vicinity of the surface of the winding 12, forming a thermal boundary layer. The reciprocating oscillation of the baffle 33 can stir up the thermal boundary layer that is tightly attached to the surface of the winding 12, effectively destroying the thermal boundary layer, so that the heat on the surface of the winding 12 can be directly and quickly entrained into the oil flow and carried away, thereby improving the heat exchange efficiency.

[0050] In this embodiment, specifically: the reciprocating drive torque-increasing component 4 includes a reciprocating lead screw 41, the two ends of the reciprocating lead screw 41 are rotatably connected to the fairing 31, a slider 42 is slidably connected to the outer side of the reciprocating lead screw 41, a lever 43 is fixedly connected to the inner side of the slider 42, and the lever 43 is slidably connected to the groove on the reciprocating lead screw 41. The slider 42 drives the spoiler 33 to swing back and forth through the unidirectional rotation of the reciprocating lead screw 41. The slider 42 is also connected to the swing distance compensation limiting component 5.

[0051] In this embodiment, specifically: a round rod 44 is rotatably connected inside the fairing 31, and both ends of the round rod 44 extend outside the fairing 31 and are fixedly connected to multiple blades 47. A second gear 46 is fixedly connected to the outside of the round rod 44, and a first gear 45 is fixedly connected to the outside of both ends of the reciprocating screw 41. The first gear 45 meshes with the second gear 46. The diameter of the first gear 45 is larger than the diameter of the second gear 46. The torque is increased by driving the larger diameter gear through the smaller diameter gear.

[0052] In this embodiment, specifically: the swing distance compensation limiting component 5 includes a connecting block 51, which is fixedly connected to the outside of the spoiler 33. A limiting groove 52 is formed in the connecting block 51. Two side ears 53 are fixedly connected to the inner side of the slider 42. A limiting post 54 is fixedly connected between the two side ears 53. The limiting post 54 is slidably connected to the limiting groove 52.

[0053] In this embodiment, specifically: a slide rail 56 is fixedly connected to the inner wall of the outer side of the fairing 31, and a groove 55 is provided on the outer side of the slider 42, and the slide rail 56 is slidably connected to the inner wall of the groove 55.

[0054] In this embodiment, specifically: the blade 47 includes a flow-facing part 6, a flow-following part 7, and a bevel part 8. The flow-facing part 6 is concave to increase the flow-facing area, and the flow-following part 7 is arc-shaped and convex, with a bevel part 8 at the end to reduce fluid resistance.

[0055] In this embodiment, specifically: the drainage pipe 23 is located at the neck 211 of the trumpet-shaped guide shroud 21 and is connected to the independent oil passage 221. The bottom end of the drainage pipe 23 is inclined in an outward diffusion shape, so that the oil inlet at the bottom end of the drainage pipe 23 can drain the cold oil at the heat dissipation fins 13.

[0056] In this embodiment, specifically: the connection between the rotating shaft 34 and the spoiler 33 is located in the outer half of the spoiler 33, forming a lever that requires effort to increase the swing amplitude;

[0057] In this embodiment, specifically, all components within the partitioned flow diversion component 2, the turbulence component 3, the reciprocating drive torque increasing component 4, and the swing distance compensation limiting component 5 are made of insulating material.

[0058] In summary, by using the horn-shaped flow guide 21 to partition the insulating oil of the winding 12, heat accumulation in the upper half of the winding 12 is prevented. Simultaneously, by introducing "cold" oil from the bottom of the upper half of the winding 12, the heat exchange temperature difference with the upper half of the winding is increased, thereby improving the cooling effect. The grid 22 inside the horn-shaped flow guide 21 creates multiple independent oil channels 221 on the outer side of the winding 12. With one or more drain pipes 23 connecting to these independent oil channels 221, a chimney effect is formed, which becomes more pronounced with a larger temperature difference. As the oil flows upwards from the outside of the horn-shaped flow guide 21, it drives the baffle 33 to swing, disrupting the thermal boundary layer on the outer surface of the winding 12. Similarly, as the temperature rises, the oil flow velocity outside the horn-shaped flow guide 21 increases, and the corresponding oscillation frequency of the baffle 33 increases. Therefore, under the above configuration, the present invention can effectively and precisely cool the hot areas of the winding 12 through passive partitioned flow guidance, greatly improving cooling efficiency and enhancing the stability of transformer operation.

[0059] 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. A passive oil-immersed transformer capable of increasing heat dissipation, comprising a transformer body (1), characterized in that: The transformer body (1) includes a housing (11), with heat dissipation fins (13) arranged around the housing (11), and a winding (12) arranged inside the housing (11). A partitioned current diversion assembly (2) is fitted on the outside of the winding (12). The partitioned flow diversion assembly (2) includes a horn-shaped flow guide shroud (21), which is divided into a flow guide arc section (212) and a neck (211) at the top and bottom. Multiple grids (22) are provided inside the horn-shaped flow guide shroud (21). Multiple independent oil passages (221) are formed inside the horn-shaped flow guide shroud (21) through the grids (22). One or more flow diversion pipes (23) are connected to the bottom of the independent oil passages (221) to form a chimney effect from bottom to top. A turbulence component (3) is provided on the side wall of the independent oil passages (221) to disrupt the thermal boundary layer. The neck (211) and inner wall of the grille (22) of the horn-shaped fairing (21) are in contact with the winding (12), and the flow-guiding arc surface (212) of the horn-shaped fairing (21) gradually moves away from the winding (12) from bottom to top in a diffused manner. The spoiler assembly (3) includes a fairing (31), which is disposed on a guide arc surface (212). Multiple movable windows (32) are provided on the guide arc surface (212). A rotating shaft (34) is rotatably connected to the fairing (31). A spoiler (33) is fixedly sleeved on the outside of the rotating shaft (34). The inner side of the spoiler (33) extends into the movable window (32) and is close to the outer side of the winding (12). A reciprocating drive torque-increasing assembly (4) is connected to the outer side of the spoiler (33). The reciprocating drive torque-increasing assembly (4) includes a reciprocating lead screw (41), the two ends of which are rotatably connected to the fairing (31). A slider (42) is slidably connected to the outside of the reciprocating lead screw (41), and a lever (43) is fixedly connected to the inside of the slider (42). The lever (43) is slidably connected to the groove on the reciprocating lead screw (41). The slider (42) drives the spoiler (33) to swing back and forth through the unidirectional rotation of the reciprocating lead screw (41). A swing distance compensation limit assembly (5) is also connected to the slider (42). A round rod (44) is rotatably connected inside the fairing (31). Both ends of the round rod (44) extend to the outside of the fairing (31) and are fixedly connected to multiple blades (47). A second gear (46) is fixedly connected to the outside of the round rod (44). A first gear (45) is fixedly connected to the outside of both ends of the reciprocating screw (41). The first gear (45) meshes with the second gear (46). The diameter of the first gear (45) is larger than the diameter of the second gear (46). The torque is increased by driving the larger diameter gear through the smaller diameter gear. The swing distance compensation limiting component (5) includes a connecting block (51), which is fixedly connected to the outside of the spoiler (33). A limiting groove (52) is opened in the connecting block (51). Two side ears (53) are fixedly connected to the inner side of the slider (42). A limiting post (54) is fixedly connected between the two side ears (53). The limiting post (54) is slidably connected to the limiting groove (52).

2. A passive oil-immersed transformer with improved heat dissipation effect according to claim 1, characterized in that: A slide rail (56) is fixedly connected to the inner wall of the outer side of the fairing (31), and a groove (55) is provided on the outer side of the slider (42). The slide rail (56) is slidably connected to the inner wall of the groove (55).

3. A passive oil-immersed transformer with improved heat dissipation effect according to claim 2, characterized in that: The blade (47) includes a frontal section (6), a downstream section (7), and a bevel section (8). The frontal section (6) is concave to increase the frontal area, and the downstream section (7) is arc-shaped and protruding. The end is provided with a bevel section (8) to reduce fluid resistance.

4. A passive oil-immersed transformer with improved heat dissipation effect according to claim 3, characterized in that: The drain pipe (23) is located at the neck (211) of the horn-shaped flow guide (21) and is connected to the independent oil passage (221). The bottom end of the drain pipe (23) is inclined outward, so that the oil inlet at the bottom end of the drain pipe (23) can drain the cold oil at the heat dissipation fins (13).

5. A passive oil-immersed transformer with improved heat dissipation effect according to claim 4, characterized in that: The connection between the rotating shaft (34) and the spoiler (33) is located in the outer half of the spoiler (33), forming a lever that increases the swing amplitude.

6. A passive oil-immersed transformer with improved heat dissipation effect according to claim 5, characterized in that: All components in the partitioned flow diversion assembly (2), the turbulence assembly (3), the reciprocating drive torque increasing assembly (4), and the swing distance compensation limit assembly (5) are made of insulating material.

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