Oil immersed transformer with self-cooling function

Abstract

The invention relates to the technical field of transformers, and discloses an oil-immersed transformer with a self-cooling function, which comprises a base, an oil-immersed transformer main body is fixedly connected to the top of the base, a plurality of heat dissipation devices are arranged on the side surface of the oil-immersed transformer main body, and a plurality of natural wind guide mechanisms are annularly distributed at the top of the base. The top of the heat dissipation device is fixedly connected with a leakage magnetic flux vibration mechanism, and a self-cleaning mechanism is rotationally arranged between every two adjacent heat dissipation fins of the heat dissipation device. Through the self-cleaning mechanism, natural wind blows the wheel body and the arc-shaped blades to rotate, the cleaning brush is driven to remove dust and sundries on the surface of the radiator, heat convection is enhanced, the radiating efficiency of the hydraulic press is improved, meanwhile, the design does not need an additional power source, and energy conservation and environmental protection are achieved. The leakage magnetic flux vibration mechanism is arranged, leakage magnetic flux generated by a transformer coil is utilized, the sub vibration piece units vibrate under the action of an alternating magnetic field through electromagnetic induction, and dust on the surfaces of the cooling fins is shaken off.

Description

Technical Field

[0001] The present invention relates to the technical field of transformers, and specifically to an oil-immersed transformer with a self-cooling function. Background Art

[0002] For an oil-immersed transformer with a self-cooling function, its interior is filled with insulating oil, and cooling is achieved through natural oil circulation and heat dissipation through the outer shell. This type of transformer does not require additional active cooling equipment, can effectively reduce operating costs and maintenance workload, and is widely used in fields such as power grid transmission, industrial enterprise power supply, and urban residential community power distribution to ensure the stable transmission and distribution of electricity.

[0003] A Chinese patent with the publication number CN118762908B discloses a cooling type oil-immersed transformer, which includes an oil-immersed transformer body, an oil storage tank provided on the oil-immersed transformer body to provide cooling oil for its interior, and heat dissipation fins provided on the outer peripheral wall of the oil-immersed transformer body. A first purging pipe for downward purging is installed on the heat dissipation fins outside the oil-immersed transformer body. At the same time, a second purging pipe penetrates through the heat dissipation fins, and purging spray holes are provided on the outer peripheral wall of the second purging pipe to purge the dust attached between the heat dissipation fins from multiple angles, thereby ensuring its cleanliness and being beneficial to improving the heat dissipation efficiency.

[0004] This cooling type oil-immersed transformer blows high-pressure gas through the spray holes to blow away the dust attached to the heat dissipation fins, thereby accelerating the heat dissipation of the transformer. However, this method does not thoroughly clean the heat dissipation fins, resulting in low heat dissipation efficiency of the transformer. Moreover, the additional equipment such as air pumps not only increases the complexity of the entire system, but also raises the equipment cost and operating energy consumption. In view of this situation, we have proposed an oil-immersed transformer with a self-cooling function. Summary of the Invention

[0005] The purpose of the present invention is to provide an oil-immersed transformer with a self-cooling function to solve the problems raised in the above background art.

[0006] To achieve the above purpose, the present invention provides the following technical solution: An oil-immersed transformer with a self-cooling function includes a base, a top of the base is fixedly connected with an oil-immersed transformer body, a plurality of heat dissipation devices are provided on a side of the oil-immersed transformer body, each heat dissipation device is correspondingly arranged on the side of the oil-immersed transformer body, a plurality of natural wind guiding mechanisms are annularly arranged on the top of the base, each natural wind guiding mechanism is correspondingly arranged on the side of the oil-immersed transformer body, a leakage magnetic flux vibration mechanism is fixedly connected to a top of the heat dissipation device, a self-cleaning mechanism is rotatably arranged between two adjacent heat dissipation fins of the heat dissipation device, and adjacent self-cleaning mechanisms are arranged with staggered heights; The self-cleaning mechanism includes a rotating wheel assembly. A driving shaft sleeve assembly is fixedly connected to the bottom of the rotating wheel assembly. Two cleaning brushes are fixedly installed on the outer cylindrical surface of the driving shaft sleeve assembly. The bristles of the cleaning brushes are arranged in a wavy shape, and the staggered angle between adjacent bristles is 15-30°. The two cleaning brushes are evenly distributed about the axis of the driving shaft sleeve assembly.

[0007] Preferably, the rotating wheel assembly includes a wheel body. Four arc-shaped blades are fixedly connected to the inner cavity of the wheel body. The four arc-shaped blades are evenly distributed about the axis of the wheel body. The distance between the large ends of the four arc-shaped blades and the inner wall of the wheel body forms a tapered flow channel. Ventilation holes are provided at the bottom of the wheel body. A one-way flow guiding column is fixedly arranged at the central position inside the wheel body. The outer cylindrical surface of the one-way flow guiding column is fixedly connected to the small ends of the four arc-shaped blades.

[0008] Preferably, a square hole is provided at the central position of the one-way flow guiding column. The square hole extends along the central axis of the one-way flow guiding column and penetrates the lower end surface of the one-way flow guiding column. Four check grooves are provided inside the one-way flow guiding column. The four check grooves are evenly distributed circumferentially about the one-way flow guiding column. The check grooves have a structure of one-way blocking flanges.

[0009] Preferably, the driving shaft sleeve assembly includes a rotating cylinder. A plurality of air flow guiding rings are fixedly arranged inside the rotating cylinder. The air flow guiding rings are inclined towards the oncoming flow side at an inclination angle of 15°, and the plurality of air flow guiding rings are arranged at equal intervals along the axial direction of the rotating cylinder. A plurality of slit-shaped holes are provided on the surface of the rotating cylinder. The plurality of slit-shaped holes correspond to the air flow guiding rings one by one.

[0010] Preferably, the leakage flux vibration mechanism includes two fixing plates. The two fixing plates are arranged at intervals up and down. A vibration assembly is fixedly arranged between the two fixing plates. A magnetic conduction block is fixedly connected to the top of the upper fixing plate. One ends of the two fixing plates close to the oil-immersed transformer body are fixedly connected to one ends of the heat dissipation device far from the oil-immersed transformer body.

[0011] Preferably, the vibration assembly includes a support block. A plurality of groups of vibration piece groups are fixedly connected to the left side of the support block. These vibration piece groups are evenly arranged along the length direction of the support block, and the length of each group of vibration piece groups decreases in an arithmetic progression. Each group of vibration piece groups includes a plurality of sub-vibration piece units (5022a). The plurality of sub-vibration piece units (5022a) are arranged at equal intervals along the height direction of the support block. The sub-vibration piece units (5022a) are strip-shaped and are made of thin and flexible iron-nickel alloy sheets. Inertial counterweights are fixedly connected to the ends of the sub-vibration piece units (5022a) far from the support block.

[0012] Preferably, the fixing plates are made of insulating and high-strength engineering plastics. The magnetic conduction block is laminated with grain-oriented silicon steel sheets and is in a C shape with an opening facing the vibration assembly.

[0013] Preferably, the natural wind guiding mechanism includes a fixed frame, on which a plurality of installation grooves are formed. The plurality of installation grooves are evenly arranged along the length direction of the fixed frame. A rotating shaft is arranged at the middle position of the installation groove. The rotating shaft is rotatably connected to the fixed frame, and its axis is arranged along the height direction. A guiding plate is fixedly connected to the surface of the rotating shaft. The length of the guiding plate is consistent with the axis direction of the rotating shaft. A collision block is fixedly connected to the top of the rotating shaft. Two blocking blocks are symmetrically arranged on the left and right sides of the collision block. The bottoms of the two blocking blocks are fixedly connected to the top of the fixed frame and are kept at a certain distance from the collision block for restricting the rotation angle of the collision block.

[0014] Preferably, the cross section of the guiding plate is in the shape of NACA0012 airfoil, and a plurality of straight grooves are formed on its surface along the width direction. The plurality of straight grooves are evenly arranged along the height direction.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. For the oil-immersed transformer with self-cooling function, by arranging the wheel body and the arc-shaped blades, under the blowing of natural wind, the wheel body and the arc-shaped blades rotate to drive the cleaning brush to remove dust and sundries on the surface of the radiator, eliminate the heat dissipation obstacle, and accelerate the air flow around, enhance the convective heat transfer, improve the heat dissipation efficiency of the hydraulic device. At the same time, this design does not require an additional power source, which is energy-saving and environment-friendly.

[0016] 2. For the oil-immersed transformer with self-cooling function, by arranging the one-way guiding column and the rotating cylinder, when natural wind blows to make the wheel body rotate, the wind enters the gradually shrinking flow channel composed of the wheel body and the arc-shaped blades, and is accurately guided by the one-way guiding column into the rotating cylinder. The air flow entering the rotating cylinder is sprayed on the surface of the radiator at a specific angle and distribution through the slit-shaped holes, and cooperates with the cleaning brush driven by the rotating cylinder. The cleaning brush removes larger dust and sundries, and the air flow blows out dust from the fine gaps, improving the cleaning efficiency. At the same time, the air blowing on the surface of the radiator speeds up the convection, promotes the heat exchange, increases the heat dissipation coefficient, quickly dissipates the heat of the transformer, and improves the cooling efficiency.

[0017] 3. For the oil-immersed transformer with self-cooling function, by arranging the leakage flux vibration mechanism, using the leakage flux generated by the transformer coil, the sub-vibration plate unit vibrates under the action of the alternating magnetic field through electromagnetic induction, and the vibration is transmitted to the heat sink through the fixed plate, effectively shaking off the dust on the surface of the heat sink, and solving the problems such as poor heat dissipation and decline of insulation performance caused by dust accumulation.

[0018] 4. For the oil-immersed transformer with self-cooling function, by arranging the vibration plate group, the lengths of its sub-vibration plate units are different, and various frequency vibrations are generated under the action of the leakage flux. After superposition, a complex vibration mode is formed, so that the dust is subjected to multi-directional and multi-frequency forces, avoiding "inertial accumulation" and further improving the cleaning efficiency.

[0019] 5. The oil-immersed transformer with self-cooling function, by setting up a natural wind guiding mechanism, when facing natural winds from different directions, the guiding plate will automatically turn under the action of the wind force, accurately introducing the natural wind into the gaps between the heat dissipation fins of the heat dissipation device, enabling the natural wind to directly act on the dust on the heat dissipation fins, effectively improving the dust cleaning efficiency, enhancing the air convection around the heat dissipation fins, accelerating the heat dissipation, and thus improving the cooling efficiency of the transformer. Description of the Drawings

[0020] Figure 1 Schematic diagram of the overall structure of the present invention; Figure 2 Schematic diagram of the self-cleaning mechanism of the present invention; Figure 3 Cross-sectional view of the rotating wheel assembly of the present invention; Figure 4 For the present invention Figure 3 Enlarged view of A in; Figure 5 Cross-sectional view of the drive shaft sleeve assembly of the present invention; Figure 6 For the present invention Figure 5 Enlarged view of B in; Figure 7 Schematic diagram of the leakage magnetic flux vibration mechanism of the present invention; Figure 8 Schematic diagram of the vibration assembly of the present invention; Figure 9 Schematic diagram of the natural wind guiding mechanism of the present invention; Figure 10 For the present invention Figure 9 Enlarged view of C in.

[0021] In the figure: 1, base; 2, oil-immersed transformer main body; 3, heat dissipation device; 4, self-cleaning mechanism; 401, rotating wheel assembly; 4011, wheel body; 4012, arc-shaped blade; 4013, one-way flow guiding column; 4014, tapered flow channel; 4015, ventilation hole; 4016, square hole; 4017, check groove; 402, drive shaft sleeve assembly; 4021, rotating cylinder; 4022, air flow guiding ring; 4023, slit-shaped hole; 403, cleaning brush; 5, leakage magnetic flux vibration mechanism; 501, fixing plate; 502, vibration assembly; 5021, support block; 5022, vibration piece group; 5022a, sub-vibration piece unit; 5023, inertial counterweight; 503, magnetic conduction block; 6, natural wind guiding mechanism; 601, fixed frame; 602, rotating shaft; 603, guiding plate; 604, collision block; 605, stop block; 606, installation groove; 607, straight groove. Detailed implementation manners

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0023] Embodiment 1. Please refer to Figures 1-6 , the present invention provides a technical solution: an oil-immersed transformer with a self-cooling function, including a base 1. A top of the base 1 is fixedly connected with an oil-immersed transformer body 2. A plurality of heat dissipation devices 3 are arranged on a side surface of the oil-immersed transformer body 2. Each heat dissipation device 3 is correspondingly arranged on the side surface of the oil-immersed transformer body 2. A plurality of natural wind guiding mechanisms 6 are annularly arranged on the top of the base 1. Each natural wind guiding mechanism 6 is correspondingly arranged on the side surface of the oil-immersed transformer body 2. A top of the heat dissipation device 3 is fixedly connected with a leakage flux vibration mechanism 5. A self-cleaning mechanism 4 is rotatably arranged between two adjacent heat dissipation fins of the heat dissipation device 3. Adjacent self-cleaning mechanisms 4 are arranged with staggered heights.

[0024] The self-cleaning mechanism 4 includes a rotating wheel assembly 401. A bottom of the rotating wheel assembly 401 is fixedly connected with a driving shaft sleeve assembly 402. Two cleaning brushes 403 are fixedly installed on an outer cylindrical surface of the driving shaft sleeve assembly 402. The cleaning brushes 403 rotate to brush off dust on the surface of the heat dissipation fins, so that the surface of the heat dissipation fins is kept clean, ensuring that heat can smoothly transfer from the transformer to the surrounding environment, thereby improving the heat dissipation performance of the entire transformer. The bristles of the cleaning brushes 403 are arranged in a wavy shape, and the staggered angle between adjacent bristles is 15-30°. The wavy arrangement makes the contact points of the bristles wider and the coverage area larger. The staggered angle allows the bristles to clean from different directions and angles, and can effectively reach gaps and depressions; the irregularly deformed bristles generate more friction force and can brush off stubborn dirt; the complex spatial structure of the bristles forms a micro-airflow, which can timely take away the dust brushed off and prevent re-accumulation. The two cleaning brushes 403 are evenly distributed about the axis of the driving shaft sleeve assembly 402.

[0025] The rotating wheel assembly 401 includes a wheel body 4011. Four arc-shaped blades 4012 are fixedly connected to the inner cavity of the wheel body 4011. The arc-shaped blades 4012 rotate under the blowing of natural wind, driving the cleaning brush 403 to rotate to remove dust and debris on the surface of the radiator, eliminating heat dissipation obstacles, accelerating the surrounding air flow, enhancing convective heat transfer, and improving the heat dissipation efficiency of the hydraulic device. At the same time, this design does not require an additional power source, saving energy and being environmentally friendly. The four arc-shaped blades 4012 are evenly distributed about the axis of the wheel body 4011. The distance between the large ends of the four arc-shaped blades 4012 and the inner wall of the wheel body 4011 forms a tapered flow channel 4014. The self-hot air entering the tapered flow channel 4014 accelerates and flows towards the one-way guide column 4013 due to the gradually decreasing cross-section of the flow channel. A ventilation hole 4015 is opened at the bottom of the wheel body 4011. A one-way guide column 4013 is fixedly arranged at the central position inside the wheel body 4011. The outer cylindrical surface of the one-way guide column 4013 is fixedly connected to the small ends of the four arc-shaped blades 4012.

[0026] A square hole 4016 is opened at the central position of the one-way guide column 4013. The square hole 4016 extends along the central axis of the one-way guide column 4013 and penetrates the lower end surface of the one-way guide column 4013. Four check grooves 4017 are opened inside the one-way guide column 4013. The four check grooves 4017 are evenly distributed circumferentially about the one-way guide column 4013. The check groove 4017 has a structure of a one-way blocking flange. Based on the principle of the Tesla valve, the check groove 4017 enables natural wind to only enter the square hole 4016 unidirectionally, preventing the natural wind entering the square hole 4016 from one check groove 4017 from flowing out through other check grooves 4017 and being unable to enter the rotating cylinder 4021.

[0027] The drive shaft sleeve assembly 402 includes a rotating cylinder 4021. Inside the cavity of the rotating cylinder 4021, a plurality of air flow guiding rings 4022 are fixedly arranged. The air flow guiding rings 4022 are used to guide the air flow to form a spiral flow. The spiral air flow can better fill the internal space of the rotating cylinder 4021, making the air pressure distribution at each axial position inside the rotating cylinder 4021 more uniform, thereby achieving axial balance of the air pressure. The air flow guiding rings 4022 are inclined towards the oncoming flow side at an angle of 15°, and a plurality of air flow guiding rings 4022 are arranged at equal intervals along the axial direction of the rotating cylinder 4021. A plurality of slit-shaped holes 4023 are formed on the surface of the rotating cylinder 4021, and the plurality of slit-shaped holes 4023 correspond to the air flow guiding rings 4022 one by one. The natural wind blows the wheel body 4011 to rotate. The wind enters the tapered flow channel 4014 formed by the wheel body 4011 and the arc-shaped blades 4012, and is precisely guided by the one-way guiding column 4013 into the rotating cylinder 4021. The air flow entering the rotating cylinder 4021 is sprayed on the surface of the radiator at a specific angle and distribution through the slit-shaped holes 4023, and cooperates with the cleaning brush 403 driven by the rotating cylinder 4021. The cleaning brush 403 removes larger dust and debris, and the air flow blows out the dust in the fine gaps, improving the cleaning efficiency. At the same time, the air blown on the surface of the radiator accelerates the convection, promotes heat exchange, increases the heat dissipation coefficient, quickly dissipates the heat of the transformer, and improves the cooling efficiency.

[0028] Working principle: When there is natural wind around the transformer, the working process of the whole system is as follows: Driving the cleaning brush 403 to rotate: The natural wind blows on the arc surface of the arc-shaped blade 4012, generating a driving force, which makes the arc-shaped blade 4012 drive the wheel body 4011 to rotate. The rotation of the wheel body 4011 further drives the connected rotating cylinder 4021 to rotate, so that the cleaning brush 403 fixedly connected to the rotating cylinder 4021 starts to rotate. During the rotation process, the cleaning brush 403 can effectively remove the dust on the surfaces of the heat dissipation fins of the heat dissipation device 3.

[0029] Air flow guiding and acceleration of natural wind: The natural wind is guided by the arc surface of the arc-shaped blade 4012 and enters the tapered flow channel 4014. According to the continuity equation of fluid mechanics, in the case of steady flow of an incompressible fluid, when the cross-sectional area of the flow channel gradually decreases, the air flow velocity gradually increases. The natural wind accelerates through the check groove 4017 designed based on the Tesla valve channel. Due to the special structure of the check groove 4017, the natural wind can only flow from the outside of the one-way guiding column 4013 into the square hole 4016, preventing the natural wind entering the square hole 4016 from flowing out of the check groove 4017 again.

[0030] Airflow enters the rotating cylinder 4021 and internal flow: The natural wind in the square hole 4016 enters the rotating cylinder 4021 through the ventilation hole 4015. Then, the natural wind moves downward along the inner wall of the rotating cylinder 4021 and passes through the airflow guiding ring 4022 in sequence. Under the action of the airflow guiding ring 4022, the natural wind forms a spiral flow. This spiral-flowing airflow can better fill the internal space of the rotating cylinder 4021, making the air pressure distribution more uniform at each axial position in the rotating cylinder 4021, thereby achieving axial balance of the air pressure.

[0031] Effect of the airflow on the heat sink: The natural wind at each axial position of the rotating cylinder 4021 is accelerated and blown onto the surface of the heat sink through the slit-shaped holes 4023. Since axial balance of the air pressure is achieved inside the rotating cylinder 4021, the airflow blown out at each position is of the same magnitude. The natural wind blown onto the surface of the heat sink cooperates with the cleaning brush 403, which can better remove the dust on the surface of the heat sink and improve the cleaning efficiency. At the same time, the flowing natural wind can take away the heat on the surface of the heat sink, effectively improving the heat dissipation efficiency.

[0032] Embodiment 2, distinguishing features from Embodiment 1: As Figures 7-8 , the leakage flux vibration mechanism 5 includes two fixing plates 501. The fixing plates 501 are made of insulating and high-strength engineering plastics. The two fixing plates 501 are arranged at intervals up and down. One end of the two fixing plates 501 close to the oil-immersed transformer body 2 is fixedly connected to one end of the heat dissipation device 3 far from the oil-immersed transformer body 2. A vibration assembly 502 is fixedly arranged between the two fixing plates 501. A magnetic conduction block 503 is fixedly connected to the top of the upper fixing plate 501. The magnetic conduction block 503 is laminated by grain-oriented silicon steel sheets, is in a C shape, and the opening faces the vibration assembly 502. The magnetic conduction block 503 guides the leakage flux to concentrate on passing through the vibration sheet group 5022, enhances the coupling of the leakage flux and the sub-vibration sheet unit 5022a, increases the induced current and the Ampere force, and makes the vibration of the sub-vibration sheet unit 5022a increase.

[0033] The vibration assembly 502 includes a support block 5021, and a plurality of vibration sheet groups 5022 are fixedly connected to the left side of the support block 5021. The sub-vibration sheet unit 5022a is strip-shaped and made of a thin and flexible iron-nickel alloy sheet. By using the leakage magnetic flux generated by the transformer coil, the sub-vibration sheet unit 5022a vibrates under the action of the alternating magnetic field through electromagnetic induction. The vibration is transmitted to the heat sink through the fixing plate 501, effectively shaking off the dust on the surface of the heat sink, and solving the problems such as poor heat dissipation and decreased insulation performance caused by dust accumulation. An inertial counterweight 5023 is fixedly connected to one end of the sub-vibration sheet unit 5022a far away from the support block 5021. The inertia of the inertial counterweight 5023 is used to increase the vibration amplitude and impact force, making the dust easier to fall off. These vibration sheet groups 5022 are evenly arranged along the length direction of the support block 5021, and the length of each vibration sheet group 5022 decreases in an arithmetic progression. Each vibration sheet group 5022 includes a plurality of sub-vibration sheet units 5022a, and the plurality of sub-vibration sheet units 5022a are arranged at equal intervals along the height direction of the support block 5021. The lengths of the sub-vibration sheet units 5022a are different, and they generate vibrations of multiple frequencies under the action of the leakage magnetic flux. After superposition, a complex vibration mode is formed, enabling the dust to be subjected to multi-directional and multi-frequency forces, avoiding "inertial accumulation", and further improving the cleaning efficiency.

[0034] Working principle: When an alternating current passes through the transformer winding, an alternating leakage magnetic flux will be generated. Since the sub-vibration sheet unit 5022a is made of a thin and flexible iron-nickel alloy sheet, the iron-nickel alloy sheet has high magnetic permeability and good elasticity. According to the law of electromagnetic induction, an induced electromotive force will be generated in the sub-vibration sheet unit 5022a in the leakage magnetic field. When a closed loop is formed inside the sub-vibration sheet unit 5022a, an induced current will be generated. The sub-vibration sheet unit 5022a will be subjected to the action of the Ampere force in the leakage magnetic field. Since both the current and the magnetic field are alternating, the magnitude and direction of the Ampere force change with time continuously, thereby causing the magnetic component to vibrate. The vibration is transmitted to the heat dissipation device 3 through the support block 5021 and the fixing plate 501 in sequence, and the heat dissipation device 3 vibrates to shake off the attached dust.

[0035] At the same time, the length of each vibration sheet group 5022 decreases in an arithmetic progression. Because the lengths of the sub-vibration sheet units 5022a of the vibration sheet group 5022 are different, their natural frequencies are different. Under the action of the electromagnetic force, the vibration amplitudes and frequencies of the vibration sheet groups 5022 are different. The vibrations of different frequencies are superposed to form a complex vibration mode, enabling the dust to be subjected to multi-directional and multi-frequency forces, avoiding "inertial accumulation", and further improving the cleaning efficiency.

[0036] Embodiment 3, the distinguishing features from Embodiment 1: As Figures 9-10, the natural wind guiding mechanism 6 includes a fixed frame 601. A plurality of mounting grooves 606 are formed in the fixed frame 601. The plurality of mounting grooves 606 are evenly arranged along the length direction of the fixed frame 601. A rotating shaft 602 is arranged at the middle position of the mounting groove 606. The rotating shaft 602 is rotatably connected to the fixed frame 601, and its axis is arranged along the height direction. A guiding plate 603 is fixedly connected to the surface of the rotating shaft 602. The length of the guiding plate 603 is consistent with the axis direction of the rotating shaft 602. The cross-section of the guiding plate 603 is in the shape of NACA0012 airfoil. A plurality of straight grooves 607 are formed in its surface along the width direction. The plurality of straight grooves 607 are evenly arranged along the height direction. The guiding plate 603 is used to smoothly guide the air flow to the heat dissipation device 3. The NACA0012 airfoil enables the air flow to smoothly transition. The straight grooves 607 are used to disturb the air flow, break the boundary layer of the air flow, enhance the heat exchange between the air flow and the heat sink, and improve the heat dissipation effect.

[0037] A collision block 604 is fixedly connected to the top of the rotating shaft 602. Two stoppers 605 are symmetrically arranged on the left and right sides of the collision block 604. The bottoms of the two stoppers 605 are fixedly connected to the top of the fixed frame 601 and are spaced apart from the collision block 604 by a certain distance, which is used to limit the rotation angle of the collision block 604. When facing natural winds from different directions, the guiding plate 603 will automatically turn under the action of the wind force, accurately introducing the natural wind into the gaps between the heat dissipation fins of the heat dissipation device 3, enabling the natural wind to directly act on the dust on the heat dissipation fins, effectively improving the dust cleaning efficiency, enhancing the air convection around the heat dissipation fins, accelerating the heat dissipation, and thus improving the cooling efficiency of the transformer.

[0038] Working principle: When the natural wind blows towards the heat dissipation device 3 from the front, due to the airfoil structure of the guiding plate 603, the guiding plate 603 is parallel to the air flow direction, enabling the natural wind to smoothly flow towards the heat dissipation device 3. When the natural wind blows towards the heat dissipation device 3 from the side, the natural wind acts on the surface of the guiding plate 603, causing the guiding plate 603 to deflect. After rotating a certain angle, the collision block 604 hits the stopper 605 and then stops rotating. At this time, the guiding plate 603 deflects a certain angle and then stops moving. The guiding plate 603 guides the natural wind blowing from the side to the heat dissipation device 3.

[0039] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An oil-immersed transformer with a self-cooling function, comprising a base (1), the top of which is fixedly connected to an oil-immersed transformer body (2), characterized in that: A plurality of heat sinks (3) are provided on the side of the oil-immersed transformer body (2), and each heat sink (3) is provided corresponding to the side of the oil-immersed transformer body (2). A plurality of natural wind guide mechanisms (6) are arranged around the top of the base (1), and each natural wind guide mechanism (6) is provided corresponding to the side of the oil-immersed transformer body (2). A leakage magnetic flux vibration mechanism (5) is fixedly connected to the top of the heat sink (3). A self-cleaning mechanism (4) is rotatably provided between two adjacent heat sinks of the heat sink (3), and the adjacent self-cleaning mechanisms (4) are arranged at staggered heights. The self-cleaning mechanism (4) comprises a rotating wheel assembly (401), the bottom of the rotating wheel assembly (401) being fixedly connected to a driving shaft sleeve assembly (402), the outer cylindrical surface of the driving shaft sleeve assembly (402) being fixedly mounted with two cleaning brushes (403), the bristles of the cleaning brushes (403) being arranged in a wave shape, the staggered angle of adjacent bristles being 15-30 degrees, and the two cleaning brushes (403) being evenly distributed about the axis of the driving shaft sleeve assembly (402).

2. The oil-immersed transformer with self-cooling function according to claim 1, characterized in that: The rotating wheel assembly (401) comprises a wheel body (4011), the inner cavity of the wheel body (4011) being fixedly connected to four arc-shaped blades (4012), the four arc-shaped blades (4012) being evenly distributed about the axis of the wheel body (4011), the large ends of the four arc-shaped blades (4012) being spaced from the inner wall of the wheel body (4011) to form a tapered flow channel (4014), a ventilation hole (4015) being provided at the bottom of the wheel body (4011), a one-way guide column (4013) being fixedly arranged at the center position inside the wheel body (4011), and the outer cylindrical surface of the one-way guide column (4013) being fixedly connected to the small ends of the four arc-shaped blades (4012).

3. The oil-immersed transformer with self-cooling function according to claim 2, characterized in that: A square hole (4016) is provided at the center of the one-way guide column (4013), and the square hole (4016) extends along the center axis of the one-way guide column (4013) and penetrates the lower end surface of the one-way guide column (4013). Four check grooves (4017) are provided inside the one-way guide column (4013), and the four check grooves (4017) are evenly distributed in the circumferential direction of the one-way guide column (4013), and the check grooves (4017) have a one-way blocking flange structure.

4. The oil-immersed transformer with self-cooling function according to claim 1, characterized in that: The drive shaft sleeve assembly (402) comprises a rotating cylinder (4021), wherein a plurality of airflow guide rings (4022) are fixedly arranged in the inner cavity of the rotating cylinder (4021), wherein the airflow guide rings (4022) are inclined toward the flow-on side at an angle of 15°, and the plurality of airflow guide rings (4022) are arranged at equal intervals along the axial direction of the rotating cylinder (4021), and a plurality of slit-shaped holes (4023) are opened on the surface of the rotating cylinder (4021), and the plurality of slit-shaped holes (4023) correspond one-to-one to the airflow guide rings (4022).

5. The oil-immersed transformer with self-cooling function according to claim 1, characterized in that: The leakage magnetic flux vibration mechanism (5) comprises two fixed plates (501), the two fixed plates (501) are arranged at an interval up and down, a vibration component (502) is fixedly arranged between the two fixed plates (501), a magnetic conductive block (503) is fixedly connected to the top of the upper fixed plate (501), and one end of the two fixed plates (501) close to the oil-immersed transformer body (2) is fixedly connected to one end of the heat dissipation device (3) away from the oil-immersed transformer body (2).

6. The oil-immersed transformer with self-cooling function according to claim 5, characterized in that: The vibration component (502) comprises a support block (5021), and a plurality of groups of vibration plate groups (5022) are fixedly connected to the left side of the support block (5021); the vibration plate groups (5022) are evenly arranged along the length direction of the support block (5021), and the length of each group of vibration plate groups (5022) decreases according to an arithmetic progression; each group of the vibration plate groups (5022) comprises a plurality of sub-vibration plate units (5022a); the plurality of sub-vibration plate units (5022a) are equidistantly arranged along the height direction of the support block (5021); the sub-vibration plate units (5022a) are in the shape of long strips and are made of thin and soft iron-nickel alloy sheets; and an inertial counterweight (5023) is fixedly connected to one end of the sub-vibration plate units (5022a) away from the support block (5021).

7. The oil-immersed transformer with self-cooling function according to claim 5, characterized in that: The fixing plate (501) is made of insulating and high-strength engineering plastics, and the magnetic conductive block (503) is made of oriented silicon steel sheets laminated together, in a C-shape, with an opening facing the vibration component (502).

8. The oil-immersed transformer with self-cooling function according to claim 1, characterized in that: The natural wind guide mechanism (6) comprises a fixed frame (601), the fixed frame (601) is provided with a plurality of mounting grooves (606), the plurality of mounting grooves (606) are evenly arranged along the length direction of the fixed frame (601), a rotating shaft (602) is arranged in the middle of the mounting groove (606), the rotating shaft (602) is rotatably connected to the fixed frame (601), and its axis is arranged along the height direction, a guide plate (603) is fixedly connected to the surface of the rotating shaft (602), the length of the guide plate (603) is consistent with the axis direction of the rotating shaft (602), a collision block (604) is fixedly connected to the top of the rotating shaft (602), and two stop blocks (605) are symmetrically arranged on the left and right sides of the collision block (604), the bottoms of the two stop blocks (605) are fixedly connected to the top of the fixed frame (601), and a certain distance is maintained with the collision block (604) to limit the rotation angle of the collision block (604).

9. The oil-immersed transformer with self-cooling function according to claim 8, characterized in that: The guide plate (603) has a cross-section of a NACA0012 airfoil, and a plurality of straight grooves (607) are provided on its surface along the width direction, and the plurality of straight grooves (607) are evenly arranged along the height direction.

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