Annular cooling fan of dry-type transformer

Abstract

The invention belongs to the technical field of cooling fans, and particularly relates to an annular cooling fan of a dry-type transformer, which comprises a centrifugal fan main body, a plurality of ventilation pipelines are arranged on one side of the centrifugal fan main body, and the ventilation pipelines are communicated with the centrifugal fan main body; the ventilation pipeline is further provided with a blocking dustproof assembly, the blocking dustproof assembly comprises supporting frames, the supporting frames are installed on the surface of the ventilation pipeline and located on the two sides of the ventilation opening, the blocking dustproof assembly is further provided with a wind direction adjusting assembly, the wind direction adjusting assembly comprises a special-shaped arc rod, and a push plate is arranged at the bottom of the special-shaped arc rod; the push plate is used for linkage plugging of the dustproof assembly to adjust the ventilation direction of the ventilation opening. And when the ventilation pipeline is not used, dust in the air is prevented from entering the ventilation pipeline along the ventilation openings formed in the surface of the ventilation pipeline, so that the dust is gradually accumulated in the ventilation pipeline, and the air outlet amount of the heat dissipation fan is influenced, and the ventilation effect of the heat dissipation fan in use is further improved.

Description

Technical Field

[0001] The invention belongs to the technical field of heat dissipation fans, and in particular relates to a ring-shaped heat dissipation fan for a dry-type transformer. Background Art

[0002] Dry-type transformers are now widely used in industrial production. The cooling methods of dry-type transformers are mainly natural air cooling and forced air cooling. The heat dissipation fan is located on both sides of the lower part of the transformer coil, and the cold air is directly blown into the transformer coil air duct; Although the existing heat dissipation fan device in life meets the use needs of users to a certain extent, there are still certain defects in the use process. The specific problems are as follows: the existing dry-type transformer often uses a fan to dissipate its own heat. The dry-type transformer usually uses a heat dissipation fan installed on both sides of its bottom to continuously blow air to dissipate heat. Since the opening of the heat inlet and heat outlet of the heat dissipation fan is large, it is very easy for dust to enter. The dust will gather inside the heat dissipation fan from the heat dissipation hole. The accumulated dust will occupy the internal space of the heat dissipation fan and affect the air output of the heat dissipation fan, thereby causing the heat dissipation effect of the dry-type transformer to deteriorate. After long-term use of the heat dissipation fan, the heat dissipation effect of the dry-type transformer is not good; In order to solve the above problems, the present application proposes a ring-shaped heat dissipation fan for a dry-type transformer. Summary of the invention

[0003] The present invention provides an annular heat dissipation fan for a dry-type transformer, which can effectively solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solution: a ring-shaped heat dissipation fan for a dry-type transformer, comprising a centrifugal fan body, a plurality of ventilation ducts are arranged on one side of the centrifugal fan body, and the ventilation ducts are connected to each other through four corners; The ventilation duct is connected to the centrifugal fan body, and a plurality of ventilation openings are provided on the surface of the ventilation duct; The ventilation duct is also equipped with a blocking and dustproof component, which includes a support frame, which is installed on the surface of the ventilation duct and located on both sides of the vent, and a blocking plate is provided at the bottom of the support frame, which is used to block the vent to achieve dustproof treatment inside the ventilation duct; The blocking and dustproof assembly is also equipped with a wind direction adjustment assembly, which includes a special-shaped arc rod, which is arranged on a side surface of the support frame, and a push plate is arranged at the bottom of the special-shaped arc rod, and the push plate is used to link the blocking and dustproof assembly to adjust the wind direction of the ventilation opening; The wind direction adjustment component is also equipped with a dustproof cleaning component, which includes a dustproof hole plate, which is arranged above the vent, and a conical cleaning plate is arranged on the surface of the dustproof hole plate, and the conical cleaning plate is used to clean the dust to prevent the dust from clogging the dustproof hole plate; As a preferred annular heat dissipation fan for a dry-type transformer of the present invention, the sealing and dust-proof component also includes a seesaw, which is installed on the surface of the sealing plate, and a movable rod is installed on the surface of the seesaw, and the movable rod is rotatably connected to the surface of the support frame, and gears 1 are symmetrically installed at both ends of the movable rod, a fixed frame is installed on the surface of the ventilation duct, and a rotating rod is rotatably connected to the surface of the fixed frame, and semi-arc gears are symmetrically installed on the surface of the rotating rod, and a mounting rod is rotatably connected to the surface of the fixed frame, and gear 2 is symmetrically installed on the surface of the mounting rod, the gear 1 is meshed with the gear 2, and the gear 2 is meshed with the semi-arc gear, and a servo motor is installed on one side surface of the fixed frame, and the output end of the servo motor passes through the fixed frame and is connected to one end of the rotating rod.

[0005] As a preferred annular cooling fan for a dry-type transformer of the present invention, a limiting disk is symmetrically installed on the surface of the mounting rod, and a torsion spring 1 is sleeved on the surface of the mounting rod, one end of the torsion spring 1 is connected to the fixing frame, and the other end of the torsion spring 1 is connected to the limiting disk.

[0006] As a preferred embodiment of the annular heat dissipation fan for a dry-type transformer of the present invention, the plurality of ventilation openings gradually increase in size starting from a position close to the centrifugal fan body.

[0007] As a preferred embodiment of the annular heat dissipation fan of a dry-type transformer of the present invention, the ventilation duct is made of insulating material, and the ventilation duct is in a trapezoidal structure.

[0008] As a preferred annular cooling fan for a dry-type transformer of the present invention, the wind direction adjustment component also includes a push rod, which is installed on the surface of the push plate, the semi-arc gear is connected to the special-shaped arc rod, the ventilation duct and the push plate are slidably connected, the push rod is adapted to the special-shaped arc rod, a ventilation plate is installed on one side surface of the push plate, a plurality of adjustment rods are rotatably connected in a through groove opened on the surface of the ventilation plate, a wind direction plate is installed on the surface of the adjustment rod, a plurality of adjustment rods are installed on the surface of each of the plurality of adjustment rods, a plurality of the synchronous wheels are sequentially wound with a synchronous belt, a driving motor is installed in the groove opened inside the ventilation plate, the output end of the driving motor passes through the groove opened on the surface of the ventilation plate and is connected to one of the adjusting rods.

[0009] As a preferred annular cooling fan for a dry-type transformer of the present invention, a guide rod is slidably connected in the through hole opened on the surface of the push plate, one end of the guide rod passes through the push plate and is connected to the fixed frame, and the other end of the guide rod passes through the push plate and is connected to the support frame.

[0010] As a preferred annular heat dissipation fan for a dry-type transformer of the present invention, a return spring is sleeved on the surface of the guide rod, one end of the return spring is connected to the push plate, and the other end of the return spring is connected to the support frame.

[0011] As a preferred annular cooling fan for a dry-type transformer of the present invention, the dust cleaning assembly also includes an articulated seat, the articulated seat is installed on the surface of the ventilation plate, the ventilation plate and the dust hole plate are connected, the articulated seat and the conical cleaning plate are hinged, a gear three is installed at the articulated rod inside the articulated seat, a gear four is rotatably connected inside the articulated seat, the gear three is meshed with the gear four, a rack plate is installed in the groove opened on the surface of the support frame, and the rack plate is meshed with the gear four.

[0012] As a preferred annular heat dissipation fan of a dry-type transformer of the present invention, a torsion spring 2 is sleeved on the surface of the gear 4, one end of the torsion spring 2 is connected to the hinge seat, and the other end of the torsion spring 2 is connected to the gear 4.

[0013] Compared with the prior art, the present invention has the following beneficial effects: the present invention has a scientific and reasonable structure and is safe and convenient to use: 1. A sealing and dust-proof component is provided. Through the coordinated use of a support frame, a sealing plate, a seesaw, a movable rod, a gear 1, a fixing frame, a semi-arc gear, a rotating rod, a gear 2 and a mounting rod, the vents opened on the surface of the ventilation duct can be sealed, so that when the ventilation duct is not in use, dust in the air can be prevented from entering the interior through the vents opened on the surface of the ventilation duct, thereby gradually accumulating inside the ventilation duct and affecting the air volume of the heat dissipation fan, further improving the ventilation effect of the heat dissipation fan when in use, avoiding the problem that accumulated dust affects the ventilation efficiency and causes the heat dissipation effect of the dry-type transformer to deteriorate, thereby making the ventilation effect of the device better and better improving the use requirements of the device, and being able to lift the sealing plate when using the ventilation duct, thereby facilitating the heat dissipation of the heat dissipation fan, and providing convenience and flexibility for the heat dissipation operation of the ventilation duct; Through the coordinated use of the limit plate, the torsion spring and the servo motor, it is convenient for workers to perform heat dissipation operations, reduces the labor intensity of the workers, and further improves the heat dissipation effect of the dry-type transformer.

[0014] 2. A wind direction adjustment component is provided. Through the coordinated use of the special-shaped arc rod, push plate, ventilation plate, push rod, wind direction plate, adjustment rod, synchronous wheel, synchronous belt and drive motor, the wind direction blown out of the ventilation duct can be adjusted conveniently, so as to avoid the ventilation duct being limited to the same air outlet direction, adapt to different use environments, further improve the use effect of the device, meet the actual use needs, greatly improve the range and flexibility of air outlet, and facilitate the free circulation of air by changing the ventilation direction, so that the ventilation effect is greatly improved; 3. A dust-proof cleaning component is provided. Through the coordinated use of the dust-proof hole plate, the hinge seat, the conical cleaning plate, the gear three, the gear four and the rack plate, the dust attached to the dust-proof hole plate can be cleaned, so as to avoid a large amount of dust accumulating on the surface of the dust-proof hole plate after long-term use, so that the dust-proof hole plate is blocked, affecting the working efficiency of the air outlet and heat dissipation of the ventilation duct, and the dust attached to the surface of the dust-proof hole plate is minimized to avoid the dust from clogging the dust-proof hole plate, thereby protecting the heat dissipation effect of the dust-proof hole plate, further improving the dust-proof effect of the ventilation duct, and preventing dust from affecting the air outlet; BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the planar structure of the ventilation duct and the ventilation opening of the present invention; Figure 3 It is a schematic diagram of the structure of the ventilation duct and the support frame in the present invention; Figure 4 It is a structural schematic diagram of the blocking and dustproof component in the present invention; Figure 5 It is a schematic diagram of the structure of the seesaw plate and the blocking plate in the present invention; Figure 6 It is a schematic diagram of the structure of the semi-arc gear and the special-shaped arc rod in the present invention; Figure 7 It is a schematic diagram of the structure of the ventilation plate and the wind direction plate in the present invention; Figure 8 It is a schematic diagram of the structure of the adjusting rod and the synchronous belt in the present invention; Fig. 9 It is a schematic diagram of the third-order enlarged structure of the hinge seat and the gear in the present invention; Fig.10 It is a schematic diagram of the enlarged structure of the hinge connection between the gear 4 and the rack plate in the present invention; Fig.11 For the present invention Fig.10 Schematic diagram of the enlarged structure at A in the middle Fig.12 It is a schematic diagram of the structure when the seesaw in the present invention rotates.

[0016] In the figure: 1. Centrifugal fan body; 12. Ventilation duct; 13. Ventilation port; 2. Sealing dustproof assembly; 21. Support frame; 22. Sealing plate; 23. Rocker; 24. Movable rod; 25. Gear 1; 26. Fixed frame; 27. Semi-arc gear; 28. Rotating rod; 29. ​​Gear 2; 210. Mounting rod; 211. Limiting plate; 212. Torsion spring 1; 213. Servo motor; 3. Wind direction adjustment assembly; 31. Special-shaped arc rod; 32. Push plate; 33. Ventilation plate; 34. Push rod; 35. Wind direction plate; 36. Adjustment rod; 37. Synchronous wheel; 38. Synchronous belt; 39. Driving motor; 310. Guide rod; 311. Return spring; 4. Dustproof cleaning assembly; 41. Dustproof hole plate; 42. Articulated seat; 43. Conical cleaning plate; 44. Gear three; 45. Gear four; 46. Rack plate; 47. Torsion spring two. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] Example: Figure 1-Figure 12 As shown, the present invention provides a technical solution, a ring-shaped heat dissipation fan for a dry-type transformer, comprising a centrifugal fan body 1, a plurality of ventilation ducts 12 are arranged on one side of the centrifugal fan body 1, and are connected to each other through four corners; The ventilation duct 12 is connected to the centrifugal fan body 1, and a plurality of ventilation openings 13 are provided on the surface of the ventilation duct 12; A blocking dustproof component 2 is also installed on the ventilation duct 12. The blocking dustproof component 2 includes a support frame 21. The support frame 21 is installed on the surface of the ventilation duct 12 and is located on both sides of the ventilation opening 13. A blocking plate 22 is provided at the bottom of the support frame 21. The blocking plate 22 is used to block the ventilation opening 13 to achieve dustproof treatment inside the ventilation duct 12. The blocking and dustproof component 2 also includes a seesaw 23, which is mounted on the surface of the blocking plate 22, and a movable rod 24 is mounted on the surface of the seesaw 23, and the movable rod 24 is rotatably connected to the surface of the support frame 21, and gears 25 are symmetrically mounted at both ends of the movable rod 24, and a fixed frame 26 is mounted on the surface of the ventilation duct 12, and a rotating rod 28 is rotatably connected to the surface of the fixed frame 26, and a semi-arc gear 27 is symmetrically mounted on the surface of the rotating rod 28, and a mounting rod 210 is rotatably connected to the surface of the mounting rod 210, and a gear 29 is symmetrically mounted on the surface of the mounting rod 210, and the gear 25 is meshed with the gear 29, and the gear 29 is meshed with the semi-arc gear 27. The arc gears 27 are meshed with each other, a servo motor 213 is installed on one side surface of the fixing frame 26, the output end of the servo motor 213 passes through the fixing frame 26 and is connected to one end of the rotating rod 28, a limit plate 211 is symmetrically installed on the surface of the mounting rod 210, a torsion spring 212 is sleeved on the surface of the mounting rod 210, one end of the torsion spring 212 is connected to the fixing frame 26, and the other end of the torsion spring 212 is connected to the limit plate 211, a plurality of ventilation openings 13 gradually increase in size from close to the centrifugal fan body 1, the ventilation duct 12 is made of insulating material, and the ventilation duct 12 is arranged in a trapezoidal structure.

[0019] The blocking and dustproof component 2 is also equipped with a wind direction adjustment component 3, which includes a special-shaped arc rod 31, which is arranged on a side surface of the support frame 21, and a push plate 32 is arranged at the bottom of the special-shaped arc rod 31, and the push plate 32 is used to link the blocking and dustproof component 2 to adjust the wind direction of the ventilation port 13; The wind direction adjustment component 3 also includes a push rod 34, which is installed on the surface of the push plate 32. The semi-arc gear 27 is connected to the special-shaped arc rod 31. The ventilation duct 12 and the push plate 32 are slidably connected. The push rod 34 is adapted to the special-shaped arc rod 31. A ventilation plate 33 is installed on one side of the push plate 32. A plurality of adjustment rods 36 are rotatably connected in the through grooves opened on the surface of the ventilation plate 33. A wind direction plate 35 is installed on the surface of the adjustment rod 36. Synchronous wheels 37 are installed on the surfaces of the plurality of adjustment rods 36. Synchronous belts 38 are wound around the plurality of synchronous wheels 37 in sequence. The recessed grooves opened inside the ventilation plate 33 are A driving motor 39 is installed in the groove, and the output end of the driving motor 39 passes through the groove opened on the surface of the ventilation plate 33 and is connected to one of the adjusting rods 36. A guide rod 310 is slidably connected in the through hole opened on the surface of the push plate 32. One end of the guide rod 310 passes through the push plate 32 and is connected to the fixed frame 26. The other end of the guide rod 310 passes through the push plate 32 and is connected to the support frame 21. A reset spring 311 is sleeved on the surface of the guide rod 310. One end of the reset spring 311 is connected to the push plate 32, and the other end of the reset spring 311 is connected to the support frame 21.

[0020] The wind direction adjustment component 3 is also provided with a dustproof cleaning component 4, which includes a dustproof hole plate 41, which is arranged above the vent 13, and a conical cleaning plate 43 is arranged on the surface of the dustproof hole plate 41, which is used to clean the dust to prevent the dust from clogging the dustproof hole plate 41; The dustproof cleaning assembly 4 also includes an articulated seat 42, which is installed on the surface of the ventilation plate 33, the ventilation plate 33 is connected to the dustproof hole plate 41, the articulated seat 42 and the conical cleaning plate 43 are hinged, a gear three 44 is installed at the hinge rod inside the articulated seat 42, and a gear four 45 is rotatably connected inside the articulated seat 42, and the gear three 44 is meshed with the gear four 45. A rack plate 46 is installed in the groove opened on the surface of the support frame 21, and the rack plate 46 is meshed with the gear four 45. The surface of the gear four 45 is sleeved with a torsion spring two 47, one end of the torsion spring two 47 is connected to the articulated seat 42, and the other end of the torsion spring two 47 is connected to the gear four 45.

[0021] When the centrifugal fan body 1 is closed and stopped, the servo motor 213 on the side surface of the fixing frame 26 is first started. At this time, the output end of the servo motor 213 drives the rotating rod 28 to rotate. The rotating rod 28 drives the semi-arc gear 27 to rotate during the rotation. Since the semi-arc gear 27 is meshed with the gear 2 29, when the semi-arc gear 27 drives the gear 2 29 to rotate during the rotation, the rotation direction of the movable rod 24 can be adjusted, so that the movable rod 24 can drive the blocking plate 22 to block the vent 13 to prevent dust from entering the interior of the ventilation duct 12 from the vent 13. During the rotation, the gear 2 29 drives the mounting rod 210 to rotate. While the mounting rod 210 rotates, the torsion spring 1 212 is deformed through the limit plate 211. The torsion spring 1 212 can assist the device to perform the reset process, thereby facilitating the operation. Since the gear 2 29 is meshed with the gear 1 25, the gear 2 29 drives the gear 2 to rotate. The wheel 25 rotates, and the gear 25 drives the seesaw 23 on the movable rod 24 to rotate at the same time. During the rotation process, the seesaw 23 drives the blocking plate 22 to block the vent 13, so as to prevent dust from entering the interior of the ventilation duct 12 from the vent 13, thereby causing the air outlet of the ventilation duct 12. The multiple vents 13 are successively increased to make the air volume more balanced, further improving the heat dissipation effect of the centrifugal fan body 1. Compared with the existing dry-type transformer, which has fans on both the high-pressure side and the low-pressure side for heat dissipation, the multiple groups of vents 13 arranged around the ventilation duct 12 have a better heat dissipation effect than the heat dissipation effect on both sides. The ventilation duct 12 is made of insulating material to prevent the original coil from arcing and generating electricity. The ventilation duct 12 is shaped as a trapezoidal structure, which can make the wind flow along the trapezoidal structure of the ventilation duct 12, thereby better improving the flow effect of the wind direction. When the semi-arc gear 27 drives the special-shaped arc rod 31 to move during the rotation, the special-shaped arc rod 31 is separated from the push rod 34, and the return spring 311 is not squeezed by the push plate 32. The return spring 311 recovers its shape, thereby driving the push plate 32 to slide on the surface of the guide rod 310. The guide rod 310 can guide the moving position of the push plate 32 to avoid position deviation of the push plate 32 during the movement. At this time, the push plate 32 drives the ventilation plate 33 to disengage from the ventilation port 13, so that the blocking plate 22 blocks the ventilation port 13. When the ventilation plate 33 is connected to the ventilation port 13, the driving motor 39 can be started. At this time, the driving motor 39 drives one of the adjusting rods 36 to rotate. Since multiple adjusting rods 36 are connected by synchronous wheels 37 and synchronous belts 38, when one adjusting rod 36 rotates, it drives multiple adjusting rods to rotate at the same time. The adjusting rod 36 drives the wind direction plate 35 to rotate during the rotation, thereby adjusting the direction of the air outlet, which greatly improves the range of the air outlet direction of the ventilation duct 12. When the ventilation duct 12 is discharging air, the dustproof hole plate 41 can filter the dust in the outside air to prevent the dust from entering the interior of the ventilation duct 12 through the vent 13. When a large amount of dust is accumulated on the surface of the dustproof hole plate 41 for a long time, when the ventilation plate 33 is moving, the hinge seat 42 is driven to move. When the gear four 45 on the hinge seat 42 moves to mesh with the rack plate 46, as the position is continuously moved, the rack plate 46 drives the gear four 45 to rotate. When the gear four 45 rotates, the gear four 45 drives the torsion spring two 47 to deform. The torsion spring two 47 can reset the position of the gear four 45, thereby driving the conical cleaning plate 43 to reset, further improving the use effect of the device. Since the gear four 45 is meshed with the gear three 44, the gear four 45 drives the gear three 44 to rotate, thereby driving the conical cleaning plate 43 to swing, thereby achieving the effect of cleaning the dust attached to the dustproof hole plate 41.

[0022] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A ring-shaped heat dissipation fan for a dry-type transformer, comprising a centrifugal fan body (1), wherein a plurality of ventilation ducts (12) are arranged on one side of the centrifugal fan body (1) and are connected to each other at four corners; The ventilation duct (12) is connected to the centrifugal fan body (1), and a plurality of ventilation openings (13) are provided on the surface of the ventilation duct (12); Features: A blocking and dustproof component (2) is also installed on the ventilation duct (12), the blocking and dustproof component (2) comprising a support frame (21), the support frame (21) being installed on the surface of the ventilation duct (12) and located on both sides of the ventilation opening (13), a blocking plate (22) being provided at the bottom of the support frame (21), the blocking plate (22) being used to block the ventilation opening (13) to achieve dustproof treatment for the interior of the ventilation duct (12); The blocking and dustproof component (2) is also provided with a wind direction adjustment component (3), the wind direction adjustment component (3) comprising a special-shaped arc rod (31), the special-shaped arc rod (31) being arranged on a side surface of the support frame (21), a push plate (32) being arranged at the bottom of the special-shaped arc rod (31), the push plate (32) being used to link with the blocking and dustproof component (2) to adjust the wind direction of the ventilation opening (13); The wind direction adjustment component (3) is also provided with a dustproof cleaning component (4), the dustproof cleaning component (4) comprising a dustproof hole plate (41), the dustproof hole plate (41) being arranged above the ventilation opening (13), the surface of the dustproof hole plate (41) being provided with a conical cleaning plate (43), the conical cleaning plate (43) being used to clean dust so as to prevent the dust from clogging the dustproof hole plate (41).

2. The annular heat dissipation fan for a dry-type transformer according to claim 1, characterized in that: The blocking and dustproof component (2) further comprises a seesaw (23), the seesaw (23) being mounted on the surface of the blocking plate (22), a movable rod (24) being mounted on the surface of the seesaw (23), the movable rod (24) being rotatably connected to the surface of the support frame (21), gears (25) being symmetrically mounted on both ends of the movable rod (24), a fixing frame (26) being mounted on the surface of the ventilation duct (12), a rotating rod (28) being rotatably connected to the surface of the fixing frame (26), and the rotating rod (28) being symmetrically mounted on the surface of the rotating rod (28). A semi-arc gear (27) is installed, the surface of the fixing frame (26) is rotatably connected to a mounting rod (210), a second gear (29) is symmetrically installed on the surface of the mounting rod (210), the first gear (25) is meshed with the second gear (29), and the second gear (29) is meshed with the semi-arc gear (27), a servo motor (213) is installed on one side surface of the fixing frame (26), the output end of the servo motor (213) passes through the fixing frame (26) and is connected to one end of the rotating rod (28).

3. The annular heat dissipation fan for a dry-type transformer according to claim 2, characterized in that: A limiting disk (211) is symmetrically mounted on the surface of the mounting rod (210), and a torsion spring (212) is sleeved on the surface of the mounting rod (210), one end of the torsion spring (212) is connected to the fixing frame (26), and the other end of the torsion spring (212) is connected to the limiting disk (211).

4. The annular heat dissipation fan for a dry-type transformer according to claim 3, characterized in that: The plurality of ventilation openings (13) gradually increase in size starting from a position close to the centrifugal fan body (1).

5. The annular heat dissipation fan for a dry-type transformer according to claim 4, characterized in that: The ventilation duct (12) is made of insulating material, and the ventilation duct (12) is in the shape of a trapezoidal structure.

6. The annular heat dissipation fan for a dry-type transformer according to claim 2, characterized in that: The wind direction adjustment component (3) further comprises a push rod (34), the push rod (34) being mounted on the surface of the push plate (32), the semi-arc gear (27) being connected to the special-shaped arc rod (31), the ventilation duct (12) being slidably connected to the push plate (32), the push rod (34) being matched to the special-shaped arc rod (31), a ventilation plate (33) being mounted on one side surface of the push plate (32), a plurality of adjustment rods (36) being rotatably connected in a through groove provided on the surface of the ventilation plate (33), a wind direction plate (35) being mounted on the surface of the adjustment rod (36), a synchronous wheel (37) being mounted on the surfaces of the plurality of adjustment rods (36), a synchronous belt (38) being sequentially wound around the plurality of synchronous wheels (37), a driving motor (39) being mounted in a groove provided inside the ventilation plate (33), an output end of the driving motor (39) passing through the groove provided on the surface of the ventilation plate (33) and being connected to one of the adjustment rods (36).

7. The annular heat dissipation fan for a dry-type transformer according to claim 6, characterized in that: A guide rod (310) is slidably connected in a through hole formed on the surface of the push plate (32); one end of the guide rod (310) passes through the push plate (32) and is connected to the fixing frame (26); the other end of the guide rod (310) passes through the push plate (32) and is connected to the supporting frame (21).

8. The annular heat dissipation fan for a dry-type transformer according to claim 7, characterized in that: A return spring (311) is sleeved on the surface of the guide rod (310), one end of the return spring (311) is connected to the push plate (32), and the other end of the return spring (311) is connected to the support frame (21).

9. The annular heat dissipation fan for a dry-type transformer according to claim 6, characterized in that: The dustproof cleaning assembly (4) also includes an articulated seat (42), wherein the articulated seat (42) is mounted on the surface of the ventilation plate (33), wherein the ventilation plate (33) is connected to the dustproof hole plate (41), wherein the articulated seat (42) is articulated to the conical cleaning plate (43), wherein a gear three (44) is mounted at a hinge rod inside the articulated seat (42), wherein a gear four (45) is rotatably connected inside the articulated seat (42), wherein the gear three (44) is meshed with the gear four (45), and wherein a rack plate (46) is mounted in a groove formed on the surface of the support frame (21), wherein the rack plate (46) is meshed with the gear four (45).

10. The annular heat dissipation fan for a dry-type transformer according to claim 9, characterized in that: A torsion spring 2 (47) is sleeved on the surface of the gear 4 (45), one end of the torsion spring 2 (47) is connected to the hinge seat (42), and the other end of the torsion spring 2 (47) is connected to the gear 4 (45).

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