Oil-immersed transformer with self-cooling function

Abstract

The application relates to the technical field of transformers, and discloses an oil-immersed transformer with a self-cooling function, which comprises a base, the top of the base is fixedly connected with an oil-immersed transformer body, the side of the oil-immersed transformer body is provided with a plurality of heat dissipation devices, the top of the base is annularly provided with a plurality of natural wind guiding mechanisms, the top of the heat dissipation device is fixedly connected with a magnetic flux leakage vibration mechanism, and self-cleaning mechanisms are rotationally arranged between two adjacent heat dissipation fins of the heat dissipation device. Through the self-cleaning mechanism, the natural wind drives the rotation of the wheel body and the arc-shaped blades, the cleaning brush is driven to remove dust and sundries on the surface of the radiator, the convection heat exchange is enhanced, the heat dissipation efficiency of the hydraulic device is improved, meanwhile, the design does not need an additional power source, and is energy-saving and environment-friendly. Through the magnetic flux leakage vibration mechanism, the magnetic flux leakage generated by the transformer coil is utilized, the sub-vibration piece unit is vibrated under the action of the alternating magnetic field through electromagnetic induction, and dust on the surface of the heat dissipation fin is shaken off.

Description

Technical Field

[0001] This invention relates to the field of transformer technology, specifically to an oil-immersed transformer with self-cooling function. Background Technology

[0002] Oil-immersed transformers with self-cooling function are filled with insulating oil and achieve cooling through natural oil circulation and heat dissipation from the outer casing. These transformers require no additional active cooling equipment, effectively reducing operating costs and maintenance workload. They are widely used in power grid transmission, industrial power supply, and urban residential power distribution to ensure stable power transmission and distribution.

[0003] Chinese patent CN118762908B discloses a cooled oil-immersed transformer, including an oil-immersed transformer body, an oil reservoir provided with cooling oil on the transformer body, and heat dissipation fins on the outer peripheral wall of the transformer body. A first downward blowing pipe is installed on the heat dissipation fins on the outside of the transformer body, and a second blowing pipe is also inserted through the heat dissipation fins. The outer peripheral wall of the second blowing pipe has blowing air holes, which blow away the dust attached between the heat dissipation fins from multiple angles, thereby ensuring its cleanliness and improving heat dissipation efficiency.

[0004] The current type of oil-immersed transformer uses high-pressure gas blown from air jets to remove dust adhering to the heat sink fins, thus accelerating heat dissipation. However, this method is not thorough in cleaning the heat sink fins, resulting in low heat dissipation efficiency. Furthermore, the added air pump and other equipment not only increase the complexity of the entire system but also raise equipment costs and operating energy consumption. To address this issue, we propose an oil-immersed transformer with self-cooling capabilities. Summary of the Invention

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

[0006] To achieve the above objectives, the present invention provides the following technical solution: an oil-immersed transformer with self-cooling function, including a base, an oil-immersed transformer body fixedly connected to the top of the base, multiple heat dissipation devices provided on the side of the oil-immersed transformer body, each heat dissipation device being respectively arranged corresponding to the side of the oil-immersed transformer body, multiple natural wind guiding mechanisms arranged around the top of the base, each natural wind guiding mechanism being respectively arranged corresponding to the side of the oil-immersed transformer body, a leakage flux vibration mechanism fixedly connected to the top of the heat dissipation device, and a self-cleaning mechanism rotatably arranged between two adjacent heat dissipation fins of the heat dissipation device, with adjacent self-cleaning mechanisms arranged at staggered heights;

[0007] The self-cleaning mechanism includes a rotating wheel assembly, a drive shaft sleeve assembly is fixedly connected to the bottom of the rotating wheel assembly, and two cleaning brushes are fixedly installed on the outer cylindrical surface of the drive shaft sleeve assembly. The bristles of the cleaning brushes are arranged in a wavy shape, and the angle between adjacent bristles is 15-30°. The two cleaning brushes are evenly distributed about the axis of the drive shaft sleeve assembly.

[0008] Preferably, the rotating wheel assembly includes a wheel body, and 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 large ends of the four arc-shaped blades and the inner wall of the wheel body form a gradually narrowing flow channel. A ventilation hole is provided at the bottom of the wheel body. A one-way flow guide column is fixedly provided at the center of the inner part of the wheel body. The outer cylindrical surface of the one-way flow guide column is fixedly connected to the small ends of the four arc-shaped blades.

[0009] Preferably, a square hole is provided at the center of the unidirectional flow guide column, the square hole extends along the central axis of the unidirectional flow guide column and penetrates the lower end face of the unidirectional flow guide column, and four check grooves are provided inside the unidirectional flow guide column. The four check grooves are evenly distributed around the circumference of the unidirectional flow guide column, and the check grooves have a unidirectional blocking flange structure.

[0010] Preferably, the drive shaft sleeve assembly includes a rotating cylinder, and a plurality of airflow guide rings are fixedly disposed in the inner cavity of the rotating cylinder. The airflow guide rings are inclined towards the airflow side at an angle of 15°, and the plurality of airflow guide rings are arranged at equal intervals along the axial direction of the rotating cylinder. A plurality of slit-shaped holes are opened on the surface of the rotating cylinder, and the plurality of slit-shaped holes correspond one-to-one with the airflow guide rings.

[0011] Preferably, the leakage flux vibration mechanism includes two fixed plates, which are arranged vertically at intervals. A vibration component is fixedly disposed between the two fixed plates. A magnetic block is fixedly connected to the top of the upper fixed plate. The ends of the two fixed plates near the body of the oil-immersed transformer are fixedly connected to the ends of the heat dissipation device away from the body of the oil-immersed transformer.

[0012] Preferably, the vibration assembly includes a support block, and multiple sets of vibrating plate groups are fixedly connected to the left side of the support block. These vibrating plate groups are evenly arranged along the length direction of the support block, and the length of each set of vibrating plate groups decreases in an arithmetic sequence. Each set of vibrating plate groups includes multiple sub-vibrating plate units (5022a). The multiple sub-vibrating plate units (5022a) are equidistantly arranged along the height direction of the support block. The sub-vibrating plate units (5022a) are elongated and made of thin and flexible iron-nickel alloy sheets. An inertial counterweight is fixedly connected to the end of each sub-vibrating plate unit (5022a) away from the support block.

[0013] Preferably, the fixing plate is made of insulating and high-strength engineering plastic, and the magnetic conductive block is made of oriented silicon steel sheets stacked together, in the shape of a C, with the opening facing the vibration component.

[0014] Preferably, the natural wind guiding mechanism includes a fixed frame with multiple mounting slots evenly arranged along the length of the fixed frame. A rotating shaft is positioned in the middle of each mounting slot and is rotatably connected to the fixed frame. Its axis is arranged along the height direction. A guide plate is fixedly connected to the surface of the rotating shaft, and the length of the guide plate is consistent with the axis of the rotating shaft. A stop block is fixedly connected to the top of the rotating shaft. Two stops are symmetrically arranged on the left and right sides of the stop block. The bottoms of the two stops are fixedly connected to the top of the fixed frame and maintain a certain distance from the stop block to limit the rotation angle of the stop block.

[0015] Preferably, the guide plate has a cross-section in the shape of an airfoil (NACA0012), and its surface has multiple straight grooves along the width direction, with the multiple straight grooves being evenly arranged along the height direction.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. This oil-immersed transformer with self-cooling function, by setting a wheel body and arc-shaped blades, under the blowing of natural wind, the wheel body and arc-shaped blades rotate to drive the cleaning brush to remove dust and debris from the surface of the radiator, eliminate heat dissipation obstacles, accelerate the surrounding air flow, enhance convective heat transfer, and improve the heat dissipation efficiency of the hydraulic unit. At the same time, this design does not require an additional power source, making it energy-saving and environmentally friendly.

[0018] 2. This oil-immersed transformer with self-cooling function utilizes a unidirectional airflow guide column and a rotating cylinder. Natural wind drives the wheel to rotate, and the airflow enters the gradually narrowing flow channel formed by the wheel and curved blades. The airflow is precisely guided by the unidirectional airflow guide column into the rotating cylinder. The airflow entering the rotating cylinder is then sprayed onto the radiator surface at a specific angle and distribution through narrow orifices. This, combined with a cleaning brush driven by the rotating cylinder, removes larger dust and debris, while the airflow penetrates deep into tiny crevices and blows out dust, improving cleaning efficiency. Simultaneously, the air blowing onto the radiator surface accelerates convection, promotes heat exchange, increases the heat dissipation coefficient, and rapidly dissipates heat from the transformer, enhancing cooling efficiency.

[0019] 3. This oil-immersed transformer with self-cooling function uses a leakage flux vibration mechanism to generate leakage flux in the transformer coil. Through electromagnetic induction, the sub-vibrating plate unit vibrates under the action of an alternating magnetic field. The vibration is transmitted to the heat sink through the fixing plate, effectively shaking off the dust on the surface of the heat sink and solving the problems of poor heat dissipation and reduced insulation performance caused by dust accumulation.

[0020] 4. This oil-immersed transformer with self-cooling function, by setting up a vibrating plate group, has different lengths for each sub-vibrating plate unit, which generates multiple frequencies of vibration under the action of leakage flux. These frequencies are superimposed to form a complex vibration mode, allowing dust to be subjected to multi-directional and multi-frequency forces, avoiding "inertial accumulation" and further improving cleaning efficiency.

[0021] 5. This oil-immersed transformer with self-cooling function, by setting a natural wind guiding mechanism, will automatically turn under the action of wind force when facing natural wind from different directions, accurately introducing natural wind into the gaps between the heat sinks of the heat dissipation device, so that the natural wind can directly act on the dust on the heat sink, effectively improving the dust cleaning efficiency, and also enhancing the air convection around the heat sink, accelerating heat dissipation, and thus improving the cooling efficiency of the transformer. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the self-cleaning mechanism of the present invention;

[0024] Figure 3 This is a cross-sectional view of the rotating wheel assembly of the present invention;

[0025] Figure 4 For the present invention Figure 3 Enlarged view of A in the middle;

[0026] Figure 5 This is a cross-sectional view of the drive bushing assembly of the present invention;

[0027] Figure 6 For the present invention Figure 5 Enlarged view of B in the middle;

[0028] Figure 7 This is a schematic diagram of the leakage flux vibration mechanism of the present invention;

[0029] Figure 8 This is a schematic diagram of the vibration component structure of the present invention;

[0030] Figure 9 This is a schematic diagram of the natural wind guiding mechanism of the present invention;

[0031] Figure 10 For the present invention Figure 9 A magnified view of C.

[0032] In the diagram: 1. Base; 2. Main body of oil-immersed transformer; 3. Heat dissipation device;

[0033] 4. Self-cleaning mechanism; 401. Rotating wheel assembly; 4011. Wheel body; 4012. Arc-shaped blades; 4013. One-way guide column; 4014. Gradient flow channel; 4015. Ventilation hole; 4016. Square hole; 4017. Check groove; 402. Drive shaft sleeve assembly; 4021. Rotating cylinder; 4022. Airflow guide ring; 4023. Slit-shaped hole; 403. Cleaning brush;

[0034] 5. Leakage flux vibration mechanism; 501. Fixing plate; 502. Vibration assembly; 5021. Support block; 5022. Vibrating plate assembly; 5022a. Sub-vibrating plate unit; 5023. Inertial counterweight; 503. Magnetic guide block;

[0035] 6. Natural wind guiding mechanism; 601. Fixed frame; 602. Rotating shaft; 603. Guide plate; 604. Impact block; 605. Stop block; 606. Mounting groove; 607. Straight groove. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Example 1, please refer to Figure 1-6 The present invention provides a technical solution: an oil-immersed transformer with self-cooling function, including a base 1, an oil-immersed transformer body 2 fixedly connected to the top of the base 1, multiple heat dissipation devices 3 provided on the side of the oil-immersed transformer body 2, each heat dissipation device 3 being respectively arranged corresponding to the side of the oil-immersed transformer body 2, multiple natural wind guiding mechanisms 6 arranged around the top of the base 1, each natural wind guiding mechanism 6 being respectively arranged corresponding to the side of the oil-immersed transformer body 2, a leakage flux vibration mechanism 5 fixedly connected to the top of the heat dissipation device 3, and a self-cleaning mechanism 4 rotatably arranged between two adjacent heat dissipation fins of the heat dissipation device 3, with adjacent self-cleaning mechanisms 4 arranged at staggered heights.

[0038] The self-cleaning mechanism 4 includes a rotating wheel assembly 401. A drive shaft sleeve assembly 402 is fixedly connected to the bottom of the rotating wheel assembly 401. Two cleaning brushes 403 are fixedly mounted on the outer cylindrical surface of the drive shaft sleeve assembly 402. The cleaning brushes 403 rotate to remove dust from the surface of the heat sink, keeping the heat sink surface clean and ensuring that heat can be smoothly transferred from the transformer to the surrounding environment, thereby improving the overall heat dissipation performance of the transformer. The bristles of the cleaning brushes 403 are arranged in a wavy pattern, with adjacent bristles intersecting at an angle of 15-30°. The wavy arrangement allows for a wider distribution of bristle contact points and a larger coverage area. The intersecting angle allows the bristles to clean from different directions and angles, effectively reaching crevices and recesses. The irregularly deformed bristles generate more friction, removing stubborn dirt. The complex spatial structure of the bristles creates micro-airflow, which can promptly carry away the brushed-off dust and prevent it from re-accumulating. The two cleaning brushes 403 are evenly distributed about the axis of the drive shaft sleeve assembly 402.

[0039] The rotating wheel assembly 401 includes a wheel body 4011, and 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 and remove dust and debris from the surface of the radiator, eliminating heat dissipation obstacles, accelerating the surrounding airflow, 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, making it energy-saving and environmentally friendly. Four arc-shaped blades 4012 are evenly distributed about the axis of the wheel body 4011. The large ends of the four arc-shaped blades 4012 and the inner wall of the wheel body 4011 form a gradually narrowing flow channel 4014. The self-heating air entering the gradually narrowing flow channel 4014 is accelerated and flows towards the unidirectional guide column 4013 due to the gradually smaller cross-section of the flow channel. A ventilation hole 4015 is provided at the bottom of the wheel body 4011. A unidirectional guide column 4013 is fixedly installed at the center of the wheel body 4011. The outer cylindrical surface of the unidirectional guide column 4013 is fixedly connected to the small ends of the four arc-shaped blades 4012.

[0040] A square hole 4016 is provided at the center of the unidirectional flow guide column 4013. The square hole 4016 extends along the central axis of the unidirectional flow guide column 4013 and penetrates the lower end face of the unidirectional flow guide column 4013. Four check grooves 4017 are provided inside the unidirectional flow guide column 4013. The four check grooves 4017 are evenly distributed around the circumference of the unidirectional flow guide column 4013. The check grooves 4017 have a one-way blocking flange structure. Based on the principle of Tesla valve, the check grooves 4017 allow natural wind to enter the square hole 4016 in one direction only, preventing natural wind entering the square hole 4016 from flowing out of the other check grooves 4017 and thus failing to enter the rotating cylinder 4021.

[0041] The drive shaft sleeve assembly 402 includes a rotating cylinder 4021. Multiple airflow guide rings 4022 are fixedly disposed within the inner cavity of the rotating cylinder 4021. The airflow guide rings 4022 guide the airflow to form a spiral flow. This spiral flow better fills the internal space of the rotating cylinder 4021, making the air pressure distribution more uniform at various axial positions within the rotating cylinder 4021, thereby achieving axial pressure balance. The airflow guide rings 4022 are inclined towards the airflow-facing side at an angle of 15°, and the multiple airflow guide rings 4022 are arranged at equal intervals along the axial direction of the rotating cylinder 4021. Multiple slit-shaped holes 4023 are formed on the surface of the rotating cylinder 4021, each corresponding to one of the airflow guide rings 4022. Natural wind drives the wheel 4011 to rotate. Air enters the tapered flow channel 4014 formed by the wheel 4011 and the curved blades 4012, and is precisely guided by the unidirectional guide column 4013 into the rotating cylinder 4021. The airflow entering the rotating cylinder 4021 is then sprayed onto the radiator surface at a specific angle and distribution through the slit-shaped holes 4023. This airflow works in conjunction with the cleaning brush 403 driven by the rotating cylinder 4021. The cleaning brush 403 removes larger dust and debris, while the airflow penetrates deep into tiny crevices and blows out dust, improving cleaning efficiency. Simultaneously, the air blowing onto the radiator surface accelerates convection, promotes heat exchange, increases the heat dissipation coefficient, quickly dissipates transformer heat, and improves cooling efficiency.

[0042] Working principle: When there is natural wind around the transformer, the entire system works as follows:

[0043] The cleaning brush 403 is driven to rotate: Natural wind blows on the curved surface of the curved blade 4012, generating a driving force that causes the curved blade 4012 to drive the wheel 4011 to rotate. The rotation of the wheel 4011 further drives the rotating cylinder 4021 connected to it to rotate, thereby causing the cleaning brush 403, which is fixedly connected to the rotating cylinder 4021, to start rotating. During the rotation, the cleaning brush 403 can effectively remove dust from the surface of each heat sink fin of the heat dissipation device 3.

[0044] Natural wind airflow guidance and acceleration: Natural wind is guided by the arc-shaped surface of the arc-shaped blade 4012 and enters the tapered flow channel 4014. According to the continuity equation of fluid mechanics, under steady flow of incompressible fluid, the airflow velocity gradually increases as the cross-section of the flow channel gradually decreases. Natural wind is accelerated through the check groove 4017, which is designed based on a Tesla valve channel. Due to the special structure of the check groove 4017, natural wind can only flow from the outside of the unidirectional guide column 4013 into the square hole 4016, preventing the natural wind entering the square hole 4016 from flowing out again from the check groove 4017.

[0045] Airflow into and within the rotating cylinder 4021: Natural air from the square orifice 4016 enters the rotating cylinder 4021 through the ventilation hole 4015. The natural air then moves downwards along the inner wall of the rotating cylinder 4021, passing sequentially through the airflow guide ring 4022. Under the action of the airflow guide ring 4022, the natural air forms a spiral flow. This spiral airflow better fills the internal space of the rotating cylinder 4021, making the air pressure distribution more uniform at various axial positions within the rotating cylinder 4021, thereby achieving axial pressure balance.

[0046] The effect of airflow on the heatsink: Natural airflow from all axial points of the rotating cylinder 4021 is accelerated and blown onto the heatsink surface through the slit-shaped holes 4023. Because axial pressure balance is achieved within the rotating cylinder 4021, the airflow magnitude is consistent throughout. The natural airflow blowing onto the heatsink surface, in conjunction with the cleaning brush 403, effectively removes dust from the heatsink surface, improving cleaning efficiency. Simultaneously, the flowing natural airflow carries away heat from the heatsink surface, effectively improving heat dissipation efficiency.

[0047] Example 2, distinguishing features from Example 1: such as Figure 7-8 The leakage flux vibration mechanism 5 includes two fixed plates 501, which are made of insulating and high-strength engineering plastic. The two fixed plates 501 are arranged vertically at intervals, and the ends of the two fixed plates 501 near the oil-immersed transformer body 2 are fixedly connected to the ends of the heat dissipation device 3 away from the oil-immersed transformer body 2. A vibration component 502 is fixedly installed between the two fixed plates 501. A magnetic guide block 503 is fixedly connected to the top of the upper fixed plate 501. The magnetic guide block 503 is made of oriented silicon steel sheets, is C-shaped, and its opening faces the vibration component 502. The magnetic guide block 503 guides the leakage flux to concentrate through the vibrating plate group 5022, enhances the coupling between the leakage flux and the sub-vibrating plate unit 5022a, increases the induced current and Ampere force, and increases the vibration of the sub-vibrating plate unit 5022a.

[0048] The vibration assembly 502 includes a support block 5021. Multiple sets of vibrating plates 5022 are fixedly connected to the left side of the support block 5021. Each sub-vibrating plate unit 5022a is elongated and made of a thin, flexible iron-nickel alloy sheet. Utilizing the leakage magnetic flux generated by the transformer coil, the sub-vibrating plate unit 5022a vibrates under the influence of an alternating magnetic field through electromagnetic induction. The vibration is transmitted to the heat sink via the fixing plate 501, effectively shaking off dust from the heat sink surface and solving problems such as poor heat dissipation and decreased insulation performance caused by dust accumulation. An inertial counterweight 5023 is fixedly connected to the end of each sub-vibrating plate unit 5022a away from the support block 5021. The inertia of the counterweight 5023 increases the vibration amplitude and impact force, making it easier for dust to fall off. These vibrating disc groups 5022 are evenly arranged along the length of the support block 5021, and the length of each group of vibrating discs 5022 decreases in an arithmetic sequence. Each group of vibrating discs 5022 contains multiple sub-vibrating disc units 5022a, which are equidistantly arranged along the height of the support block 5021. Each sub-vibrating disc unit 5022a has a different length, generating multiple frequencies of vibration under the action of leakage magnetic flux. These vibrations are superimposed to form a complex vibration mode, subjecting dust to multi-directional and multi-frequency forces, preventing "inertial accumulation," and further improving cleaning efficiency.

[0049] Working Principle: When alternating current flows through the transformer windings, alternating leakage flux is generated. The sub-vibrating element unit 5022a is made of a thin and flexible iron-nickel alloy sheet, which has high magnetic permeability and good elasticity. According to the law of electromagnetic induction, the sub-vibrating element unit 5022a in the leakage magnetic field will generate an induced electromotive force. A closed loop is formed inside the sub-vibrating element unit 5022a, which will generate an induced current. The sub-vibrating element unit 5022a is subjected to 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 continuously with time, causing the magnetically conductive component to vibrate. The vibration is transmitted to the heat dissipation device 3 through the support block 5021 and the fixing plate 501. The vibration of the heat dissipation device 3 shakes off the attached dust.

[0050] Meanwhile, the length of each vibrating plate group 5022 decreases in an arithmetic sequence. Because the lengths of each sub-vibrating plate unit 5022a of the vibrating plate group 5022 are different, their natural frequencies are different. Under the action of electromagnetic force, the vibration amplitude and frequency of each vibrating plate group 5022 are different. The vibrations of different frequencies are superimposed to form a complex vibration mode, so that the dust is subjected to multi-directional and multi-frequency forces, avoiding "inertial accumulation" and further improving cleaning efficiency.

[0051] Example 3, distinguishing features from Example 1: such as Figure 9-10The natural wind guiding mechanism 6 includes a fixed frame 601 with multiple mounting slots 606 evenly arranged along its length. A rotating shaft 602 is positioned in the middle of each mounting slot 606 and is rotatably connected to the fixed frame 601. The shaft's axis is arranged along its height. A guide plate 603 is fixedly connected to the surface of the rotating shaft 602. The guide plate 603 has a cross-section resembling an airfoil (NACA0012) and multiple straight grooves 607 evenly arranged along its height. The guide plate 603 smoothly guides the airflow to the heat dissipation device 3. The NACA0012 airfoil design allows for a smooth transition of airflow. The straight grooves 607 disturb the airflow, breaking the boundary layer and enhancing heat exchange between the airflow and the heat sink, thus improving heat dissipation.

[0052] A stop block 604 is fixedly connected to the top of the rotating shaft 602. Two stops 605 are symmetrically arranged on the left and right sides of the stop block 604. The bottom of the two stops 605 is fixedly connected to the top of the fixed frame 601 and maintains a certain distance from the stop block 604 to limit the rotation angle of the stop block 604. When facing natural wind from different directions, the guide plate 603 will automatically turn under the action of the wind force, accurately introducing the natural wind into the gaps between the heat sinks of the heat dissipation device 3, so that the natural wind can directly act on the dust on the heat sink, effectively improving the dust cleaning efficiency, enhancing the air convection around the heat sink, accelerating heat dissipation, and thus improving the cooling efficiency of the transformer.

[0053] Working principle: When natural wind blows towards the heat dissipation device 3 from the front, due to the airfoil structure of the guide plate 603, the guide plate 603 is parallel to the airflow direction, allowing the natural wind to flow smoothly towards the heat dissipation device 3. When natural wind blows towards the heat dissipation device 3 from the side, the natural wind acts on the surface of the guide plate 603, causing the guide plate 603 to deflect. After rotating a certain angle, the impact block 604 hits the stop block 605 and stops rotating. At this time, the guide plate 603 deflects a certain angle and stops moving, thus guiding the natural wind blown from the side towards the heat dissipation device 3.

[0054] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An oil-immersed transformer with self-cooling function, comprising a base (1), a top of the base (1) is fixedly connected with an oil-immersed transformer main body (2), characterized in that: The oil-immersed transformer body (2) is provided with a plurality of heat dissipation devices (3) on the side surface, each heat dissipation device (3) is arranged correspondingly on the side surface of the oil-immersed transformer body (2), a plurality of natural wind guiding mechanisms (6) are arranged on the top of the base (1), each natural wind guiding mechanism (6) is arranged correspondingly on the side surface of the oil-immersed transformer body (2), the heat dissipation device (3) is fixedly connected with a magnetic flux leakage vibration mechanism (5) on the top, and a self-cleaning mechanism (4) is rotatably arranged between two adjacent heat dissipation fins of the heat dissipation device (3), and the adjacent self-cleaning mechanisms (4) are arranged in height staggered mode. The self-cleaning mechanism (4) comprises a rotating wheel assembly (401), the rotating wheel assembly (401) is fixedly connected with a driving shaft sleeve assembly (402) at the bottom, two cleaning brushes (403) are fixedly installed on the outer cylindrical surface of the driving shaft sleeve assembly (402), the bristles of the cleaning brush (403) are arranged in a wave shape, the stagger angle of adjacent bristles is 15-30°, and the two cleaning brushes (403) are uniformly distributed about the axis of the driving shaft sleeve assembly (402). The magnetic flux leakage vibration mechanism (5) comprises two fixed plates (501), the two fixed plates (501) are arranged in a spaced mode, a vibration assembly (502) is fixedly arranged between the two fixed plates (501), a magnetic 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 with one end of the heat dissipation device (3) away from the oil-immersed transformer body (2). The vibration assembly (502) comprises a support block (5021), a plurality of vibration piece groups (5022) are fixedly connected to the left side of the support block (5021), the vibration piece groups (5022) are uniformly arranged along the length direction of the support block (5021), the length of each vibration piece group (5022) decreases in an arithmetic progression, each vibration piece group (5022) comprises a plurality of sub-vibration piece units (5022a), the plurality of sub-vibration piece units (5022a) are equidistantly arranged along the height direction of the support block (5021), the sub-vibration piece unit (5022a) is in a strip shape and is made of a thin and soft iron-nickel alloy sheet, and one end of the sub-vibration piece unit (5022a) away from the support block (5021) is fixedly connected with an inertial counterweight (5023).

2. The oil-immersed transformer having a self-cooling function according to claim 1, characterized by: The rotating wheel assembly (401) comprises a wheel body (4011), four arc-shaped blades (4012) are fixedly connected in the inner cavity of the wheel body (4011), the four arc-shaped blades (4012) are uniformly distributed about the axis of the wheel body (4011), the large end of the four arc-shaped blades (4012) and the inner wall of the wheel body (4011) form a tapered flow channel (4014) with a spacing, ventilation holes (4015) are formed in the bottom of the wheel body (4011), a one-way flow guide column (4013) is fixedly arranged at the central position in the wheel body (4011), and the outer cylindrical surface of the one-way flow guide column (4013) is fixedly connected with the small end of the four arc-shaped blades (4012).

3. The oil-immersed transformer having a self-cooling function according to claim 2, characterized by: The square hole (4016) extends along the central axis of the one-way flow guide column (4013) and penetrates the lower end surface of the one-way flow guide column (4013), four check grooves (4017) are arranged in the one-way flow guide column (4013), the four check grooves (4017) are uniformly distributed about the circumference of the one-way flow guide column (4013), and the check groove (4017) has a one-way blocking flange structure.

4. The oil-immersed transformer having a self-cooling function according to claim 1, characterized by: The drive shaft sleeve assembly (402) comprises a rotating cylinder (4021), a plurality of airflow guide rings (4022) are fixedly arranged in the inner cavity of the rotating cylinder (4021), the airflow guide rings (4022) are inclined to the upwind 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 arranged 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 having a self-cooling function according to claim 1, characterized by: The fixed plate (501) is made of insulating and high-strength engineering plastic, the magnetic conducting block (503) is made of oriented silicon steel sheet and has a C-shaped structure with an opening facing the vibration assembly (502).

6. The oil-immersed transformer having a self-cooling function according to claim 1, characterized by: The natural wind guide mechanism (6) comprises a fixed frame (601), a plurality of mounting grooves (606) are arranged on the fixed frame (601), the plurality of mounting grooves (606) are uniformly 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 with the fixed frame (601), the axis of the rotating shaft (602) is arranged along the height direction, the surface of the rotating shaft (602) is fixedly connected with a guide plate (603), the length of the guide plate (603) is consistent with the axis direction of the rotating shaft (602), the top of the rotating shaft (602) is fixedly connected with a stop block (604), two stop blocks (605) are symmetrically arranged on the left and right sides of the stop block (604), the bottoms of the two stop blocks (605) are fixedly connected with the top of the fixed frame (601) and are spaced apart from the stop block (604) to limit the rotation angle of the stop block (604).

7. The oil-immersed transformer having a self-cooling function according to claim 6, characterized by: The cross section of the guide plate (603) is in the shape of NACA0012 airfoil, and a plurality of straight grooves (607) are arranged on the surface of the guide plate (603) along the width direction.

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