A heat dissipation device for distribution transformer

Abstract

The present invention relates to the field of transformers, and in particular to a heat dissipation device for a distribution transformer. The heat dissipation device comprises a radiator and a cleaning component, wherein the radiator comprises a heat dissipation plate, which is serpentine and hollow inside, and both ends of the heat dissipation plate are provided with openings connected to the inside thereof, and the cleaning component can be inserted into the heat dissipation plate from the openings; the cleaning component comprises an elastic plate, and the elastic plate comprises two straight plates, and one end of the two straight plates is connected and arranged at an angle, and the upper and lower ends of the two straight plates are provided with friction wheels, which can rotate and can slide elastically along a first direction, and a driving component is provided on the heat dissipation plate, and the driving component is used to drive the cleaning component to move forward along the direction of the heat dissipation plate inside the heat dissipation plate, and when in use, the heat dissipation component only needs to be inserted into the heat dissipation plate from the opening on the heat dissipation plate, and the driving component drives the friction wheel forward, thereby driving the straight plate to scrape and clean the inner wall of the heat dissipation plate, and the use is convenient and quick, and the practicability is strong.

Description

Technical Field

[0001] The invention relates to the field of transformers, and in particular to a heat dissipation device for a distribution transformer. Background Art

[0002] A distribution transformer is a static electrical appliance used in a power distribution system to transform AC voltage and current according to the law of electromagnetic induction and transmit AC power. Its main function is to transmit power. Distribution transformers are divided into oil-immersed transformers and dry-type transformers according to different insulating media. The body (windings and iron core) of an oil-immersed transformer is installed in an oil tank filled with transformer oil. The oil tank is welded with steel plates. Transformer oil is both an insulating medium and a cooling medium. After being heated, the transformer oil carries the heat of the iron core and windings to the tank wall and cooling device through convection, and then dissipates it into the surrounding air to dissipate heat from the transformer. However, after long-term use of transformer oil, a large amount of oily impurities will form. The oily impurities adhere to the transformer oil tank, the inner wall of the heat dissipation device, the windings and other parts, affecting the heat transfer effect between the heat dissipation device and the outside air. In order to improve the cooling effect of the transformer, a Chinese patent document with authorization announcement number CN 117877863 B discloses an oil-immersed power transformer with high efficiency in heat dissipation. In this solution, a partition plate is arranged in the transformer box. During the up and down movement of the partition plate, the oil on the surface of the winding can be cleaned, thereby reducing the thermal resistance between the winding and the transformer oil, making the heat conduction smoother and increasing the heat exchange efficiency of the winding. Although the above solution cleans the winding, the inner surface area of ​​the radiator is larger, and the oil impurities are more likely to accumulate in a small space, which has a greater impact on the heat transfer effect between the radiator and the outside air. The existing common method is to replace the transformer oil and disassemble the machine for centralized cleaning of the radiator, but this method is relatively cumbersome, consumes manpower and material resources, and is difficult to promote and use.

[0003] The information disclosed in the background technology section of this application is only intended to deepen the understanding of the general background technology of this application, and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. Summary of the invention

[0004] According to the deficiencies of the prior art, the present invention proposes a heat dissipation device for a distribution transformer to solve the problem of poor heat dissipation effect of the prior transformer heat dissipation device.

[0005] A heat dissipation device for a distribution transformer of the present invention adopts the following technical scheme: comprising a radiator and a cleaning assembly, the radiator comprising a heat dissipation plate, the heat dissipation plate is serpentine and hollow inside, two pipes connected to the inside of the heat dissipation plate are arranged on the heat dissipation plate, the two pipes are arranged on the left and right sides of the heat dissipation plate and are respectively located at the upper and lower ends of the heat dissipation plate, the radiator is arranged on the outer side wall of the distribution transformer, and the two pipes of the radiator are connected to the oil storage cavity inside the distribution transformer;

[0006] Both ends of the heat sink are provided with openings communicating with the interior thereof, and sealing covers are provided at the openings. The sealing covers can be opened, and the cleaning assembly can be inserted into the heat sink through the openings;

[0007] The cleaning component includes an elastic plate, which includes two straight plates. One end of the two straight plates is connected and is set at an angle. In the initial state, the opening angle of the two straight plates is greater than the width of the internal space of the heat sink. Friction wheels are provided at the upper and lower ends of the two straight plates. The friction wheels are located at the front of the straight plates. The friction wheels can rotate and can elastically slide along a first direction. The first direction is set at an angle to the extension direction of the straight plates. A driving component is provided on the heat sink. The driving component is used to drive the cleaning component to move forward inside the heat sink along the direction of the heat sink, so that the straight plates scrape the inner wall of the heat sink.

[0008] Optionally, the inner side walls of the two straight plates are respectively provided with mud guard flaps, and a plurality of mud guard flaps are arranged at intervals along the height direction of the straight plates, and two mud guard flaps at the same position on the two straight plates are stacked up and down in an offset manner.

[0009] Optionally, the driving assembly includes a lever, magnets are provided at both ends of the lever, and limiting grooves are provided on the walls at both ends of the heat sink, the limiting grooves are serpentine grooves adapted to the direction of the heat sink, and the magnets can slide along the limiting grooves; a magnetic block is provided inside the friction wheel, and the magnet generates suction with the magnetic block inside the friction wheel.

[0010] Optionally, the driving assembly further comprises a limiting bolt, which is threadedly connected to the magnet, and the bottom of the limiting bolt can extend into the limiting slide groove and slide in cooperation with the limiting slide groove.

[0011] Optionally, the heat sink is made of non-magnetic metal material.

[0012] Optionally, the cleaning assembly further comprises a vertical rod, one end of the two straight plates is connected by an arc plate, the vertical rod is inserted inside the arc plate, and the outer diameter of the vertical rod is smaller than the inner diameter of the arc plate; the centers of the upper and lower ends of the vertical rod are provided with mounting sleeves, the front end of the mounting sleeve is slidably inserted with a mounting block, the lower end of the mounting block is provided with two second rotating shafts at intervals on the left and right, and the two second rotating shafts are rotatably provided with second transmission gears, and the two second transmission gears are meshed;

[0013] A first transmission gear is coaxially fixed below each friction wheel, a first rotating shaft is provided at the lower end of the first transmission gear, the first rotating shaft can rotate and can slide a straight plate along a first direction, and the two first transmission gears can mesh with the corresponding second transmission gears; an elastic member is provided between the mounting sleeve and the mounting block, and the elastic member makes the mounting sleeve and the mounting block move away from each other.

[0014] Optionally, the inner wall of the heat sink is provided with a reset groove, there are multiple reset grooves corresponding one to one with the arc segments of the heat sink, the reset groove is located at the front end of the arc segment along the forward direction of the cleaning component, and the reset groove is arc-shaped and bulges outward.

[0015] Optionally, the inner side surfaces of the two straight plates are provided with mounting protrusions, and a guide slot is provided in the middle of the mounting protrusions, the guide slot extends along a first direction, a movable bearing is provided in the guide slot, the movable bearing can slide along the guide slot, a preload spring is connected between the side of the movable bearing facing away from the straight plate and the guide slot, the preload spring makes the movable bearing tend to move toward the direction close to the straight plate, the first rotating shaft is slidably arranged in the guide slot and is located on the side of the movable bearing close to the straight plate, an arc-shaped groove is provided on the side of the movable bearing close to the straight plate, the arc-shaped groove is adapted to the rotating shaft of the friction wheel, and under the action of the preload spring, the arc-shaped groove slides and fits with the outer peripheral wall of the friction wheel.

[0016] Optionally, the first direction is a direction perpendicular to the straight plate.

[0017] Optionally, the heat dissipation device for the distribution transformer further includes a heat dissipation fan, which is arranged on the side wall of the transformer and below the radiator.

[0018] The beneficial effects of the present invention are as follows: a heat dissipation device for a distribution transformer of the present invention is provided with a radiator and a cleaning component capable of cleaning the inner wall of a heat dissipation plate of the radiator; the main structure of the cleaning component is a deformable elastic plate, the elastic plate is in a V-shape as a whole, a friction wheel is provided on the elastic plate, and a driving component is provided on the outside of the radiator; when in use, the heat dissipation component only needs to be inserted into the heat dissipation plate from the opening on the heat dissipation plate; after insertion, the elastic plate abuts against the inner wall of the heat dissipation plate, and the driving component drives the friction wheel forward, thereby driving the cleaning component to clean the inner wall of the heat dissipation plate; the use is convenient and quick, the practicability is strong, and it is conducive to promotion.

[0019] Furthermore, the driving component adopts a magnetic attraction structure, which does not require additional power, is easy to control manually, and is simple to operate and low cost.

[0020] Furthermore, the centering structure formed by the vertical rod, the mounting sleeve, the mounting sleeve, the first transmission gear and the second transmission gear allows the cleaning assembly to always be located in the middle of the width direction of the heat sink during operation, thereby ensuring that the two straight plates of the elastic plate can contact the inner wall of the heat sink at the same angle and pressure, and no part of the straight plate other than its side edge contacts the inner wall, the device runs smoothly, the scraping effect is good, and the inner wall of the heat sink is not damaged. At the same time, the two straight plates of the elastic plate are connected by an arc plate, and the tendency of the mounting block and the mounting sleeve to move away from each other makes the elastic plate tend to stretch in the front and rear directions, reducing the deformation of the straight plate, avoiding the increase in the contact area with the side wall after the straight plate is bent, and increasing wear, and can also avoid plastic bending deformation of the straight plate, ensuring that the straight plate remains straight after multiple uses.

[0021] Furthermore, a reset groove is provided inside the heat sink, which can straighten and center the cleaning device when the cleaning device passes through the bend of the arc section, thereby ensuring the smooth and reliable operation of the device and effectively scraping the inner wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A schematic diagram of the use of a heat dissipation device for a distribution transformer of the present invention on a distribution transformer;

[0024] Figure 2 It is a structural schematic diagram of the radiator in the present invention;

[0025] Figure 3 for Figure 2 The enlarged image of point Ⅰ in the middle;

[0026] Figure 4 for Figure 3 The schematic diagram of the sealing cover is hidden in the figure;

[0027] Figure 5 It is a schematic diagram of the structure of the cleaning component in the present invention;

[0028] Figure 6 for Figure 5 Enlarged view of the middle II;

[0029] Figure 7 for Figure 6 Schematic diagram from another angle;

[0030] Figure 8 A top view of the cleaning assembly of the present invention;

[0031] Fig. 9 for Figure 6 The schematic diagram of the friction wheel and the first transmission gear is hidden in the middle;

[0032] Fig.10 for Figure 6 The schematic diagram of the friction wheel, the first transmission gear and the elastic plate is hidden in the middle;

[0033] Fig.11 It is a schematic diagram of the structure of the elastic plate in the present invention.

[0034] In the figure:

[0035] 100. Distribution transformer;

[0036] 200, radiator; 210, pipe; 220, driving assembly; 221, lever; 222, magnet; 223, limiting bolt; 230, heat sink; 231, limiting slide groove; 232, sealing cover; 233, reset groove;

[0037] 300, cooling fan;

[0038] 400, cleaning assembly; 410, elastic plate; 411, guide slide; 412, movable bearing; 413, preload spring; 414, straight plate; 415, arc plate; 420, mud flap; 430, first transmission gear; 431, first rotating shaft; 440, friction wheel; 450, second transmission gear; 460, mounting block; 461, second rotating shaft; 470, mounting sleeve; 480, vertical rod. DETAILED DESCRIPTION

[0039] 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 making creative work are within the scope of protection of the present invention.

[0040] like Figures 1 to 11 As shown, a heat dissipation device for a distribution transformer provided by an embodiment of the present invention includes a radiator 200 and a cleaning assembly 400. The radiator 200 includes a heat dissipation plate 230. The heat dissipation plate 230 is serpentine and hollow inside. Two pipes 210 are arranged on the heat dissipation plate 230 to communicate with the inside thereof. The two pipes 210 are arranged on the left and right sides of the heat dissipation plate 230 and are respectively located at the upper and lower ends of the heat dissipation plate 230. The radiator 200 is arranged on the outer wall of the distribution transformer 100. The two pipes 210 of the radiator 200 are connected to the oil storage cavity inside the distribution transformer 100. It can be understood that the body of the oil-immersed distribution transformer 100 is immersed in an oil tank filled with transformer oil. The transformer oil is both an insulating medium and a cooling medium. After the transformer oil is heated, it brings the heat of the iron core and the winding to the box wall and the cooling device through convection, and then dissipates it into the surrounding air to dissipate the heat of the transformer. Based on this solution, the transformer oil in the oil storage chamber of the distribution transformer 100 enters the heat sink 230 through the upper pipe 210. After the heat is dissipated by the heat sink 230, it flows back to the oil storage chamber of the distribution transformer 100 through the lower pipe 210, completing the cooling of the transformer oil and achieving the purpose of heat dissipation.

[0041] The heat sink 230 is provided with openings at both ends thereof, and a sealing cover 232 is provided at the opening, and the sealing cover 232 can be opened. The cleaning assembly 400 can be inserted into the heat sink 230 from the opening, and the cleaning assembly 400 is used to clean the oil stains on the inner wall of the heat sink 230.

[0042] The cleaning assembly 400 includes an elastic plate 410, and the elastic plate 410 includes two straight plates 414. One end of the two straight plates 414 is connected and set at an angle. In the initial state, the opening angle of the two straight plates 414 is greater than the width of the internal space of the heat sink 230. After the cleaning assembly 400 is placed into the heat sink 230, under the restriction of the inner wall of the heat sink 230, the two straight plates 414 are retracted close to each other and the side edges of the straight plates 414 are against the inner wall of the radiator 200, so that when the elastic plate 410 moves, the two straight plates 414 can scrape off the oil and impurities on the inner wall of the radiator 200. Friction wheels 440 are provided at the upper and lower ends of the two straight plates 414. The friction wheels 440 are located at the front of the straight plates 414 (the opening direction of the V-shaped groove formed by the two straight plates 414 is the front, and vice versa). The friction wheels 440 can rotate and can elastically slide along a first direction. The first direction is set at an angle to the extension direction of the straight plates 414, so that the friction wheels 440 can abut against the inner wall of the heat dissipation plate 230 and roll forward along the inner wall of the heat dissipation plate 230, thereby making the movement of the elastic plate 410 more stable and smooth. For the convenience of structural setting, the preferred first direction of the present invention is a direction perpendicular to the straight plates 414, that is, the first direction is 90 degrees to the straight plates 414. Naturally, the first direction can also be set at an angle of 75 degrees or others with the straight plates 414, preferably 70 degrees to 90 degrees. Specifically, the inner side surfaces (side surfaces close to each other) of the two straight plates 414 are provided with mounting protrusions, and a guide slot 411 is provided in the middle of the mounting protrusions. The guide slot 411 extends along a first direction, and a movable bearing 412 is provided in the guide slot 411. The movable bearing 412 can slide along the guide slot 411. A preload spring 413 is connected between the side of the movable bearing 412 away from the straight plate 414 and the guide slot 411. The preload spring 413 allows the movable bearing 412 to move closer to the straight plate. 414, the rotating shaft of the friction wheel 440 is slidably arranged in the guide groove 411 and is located on the side of the movable bearing 412 close to the straight plate 414, and the side of the movable bearing 412 close to the straight plate 414 is provided with an arc groove, which is adapted to the rotating shaft of the friction wheel 440. Under the action of the preload spring 413, the arc groove slides and fits with the outer peripheral wall of the friction wheel 440, so that the friction wheel 440 is always in the outer end limit position, and at the same time does not affect the rotation of the friction wheel 440.

[0043] The heat sink 230 is provided with a driving assembly 220 for driving the cleaning assembly 400 to move inside the heat sink 230 along the direction of the heat sink 230 so that the straight plate 414 scrapes the inner wall of the heat sink 230 .

[0044] The driving assembly 220 includes a lever 221, and magnets 222 are provided at the upper and lower ends of the lever 221. Limiting grooves 231 are provided on the walls at the upper and lower ends of the heat sink 230. The limiting grooves 231 are serpentine grooves adapted to the direction of the heat sink 230, and the magnets 222 can slide along the limiting grooves 231; a magnetic block is provided inside the friction wheel 440, and the magnets 222 and the magnetic blocks inside the friction wheel 440 generate suction. After the distribution transformer 100 has been used for a period of time, a certain amount of oil and impurities will adhere to the inner wall of the heat sink 230, affecting the heat dissipation effect of the radiator 200. At this time, the sealing cover 232 at one end of the heat sink 230 is opened to put the cleaning assembly 400 into the heat sink 230, adjust the angle of the elastic plate 410, cover the sealing cover 232, pull the lever 221, the lever 221 drives the magnet 222 to move along the limiting slide groove 231, and the magnet 222 pulls the cleaning assembly 400 along the inner wall of the heat sink 230 through the magnetic block inside the friction wheel 440. The two straight plates 414 scrape off the oil and impurities on the inner wall of the heat sink 230. During this process, the friction wheel 440 rolls on the inner wall of the heat sink 230 to ensure that the cleaning assembly 400 runs smoothly and stably. The cycle continues until the other end of the heat sink 230, and the corresponding sealing cover 232 is removed, and the cleaning assembly 400 is taken out for cleaning. It can be understood that in order to ensure the driving effect of the driving component 220 on the cleaning component 400, the heat sink 200 is made of non-magnetic metal material, such as aluminum or copper alloy.

[0045] Furthermore, the driving assembly 220 further includes a limiting bolt 223, the limiting bolt 223 is screwed to the magnet 222, and the bottom of the limiting bolt 223 can extend into the limiting slide groove 231 and slide with the limiting slide groove 231. Figure 4 , Figure 4 The figure shows that the cleaning component 400 is located in the newly installed position. The limit bolt 223 is loosened, and the friction wheel 440 is attracted by the magnet 222 to move the cleaning component 400 to the left as a whole. After the limit component is away from the sealing cover 232, the sealing cover 232 is covered, and the limit screw is tightened to make it enter the serpentine limit slot 231. Then, the lever 221 is pulled, and the lever 221 drives the magnet 222 to slide along the limit slot 231 through the limit bolt 223, thereby driving the cleaning component 400 to move.

[0046] It should be noted that the inner side walls of the two straight plates 414 are provided with mud flaps 420, and multiple mud flaps 420 are arranged at intervals along the height direction of the straight plates 414. The two mud flaps 420 at the same position on the two straight plates 414 are stacked up and down, which can form a receiving platform to receive dirt and facilitate the deformation of the elastic plate 410. During the forward movement of the cleaning component 400, the oily impurities on the inner wall of the heat sink 230 are scraped off by the straight plates 414, and are concentrated inside the V-shaped groove formed by the two straight plates 414 and received by the mud flaps 420. After the cleaning component 400 advances to the rear end of the heat sink 230, the cleaning component 400 is pulled out, and the oily impurities are taken out of the heat sink 230 together.

[0047] In a further embodiment, the cleaning assembly 400 also includes a vertical rod 480, one end of the two straight plates 414 is connected by an arc plate 415, the vertical rod 480 is inserted into the inside of the arc plate 415, and the outer diameter of the vertical rod 480 is smaller than the inner diameter of the arc plate 415; mounting sleeves 470 are provided at the centers of the upper and lower ends of the vertical rod 480, and a mounting block 460 is slidably inserted at the front end of the mounting sleeve 470 (that is, the end away from the vertical rod 480 in the front and rear direction), and two second rotating shafts 461 are spaced apart at the left and right sides of the lower end of the mounting block 460, and second transmission gears 450 are rotatably provided on the two second rotating shafts 461, and the two second transmission gears 450 are meshed.

[0048] A first transmission gear 430 is coaxially fixedly arranged below each friction wheel 440, and a first rotating shaft 431 is arranged at the lower end of the first transmission gear 430. The first rotating shaft 431 is the rotation of the friction wheel 440. The first rotating shaft 431 can be rotatably and slidably arranged in the guide groove 411, and the two first transmission gears 430 can mesh with the corresponding second transmission gears 450; an elastic member (not shown in the figure) is arranged between the mounting sleeve 470 and the mounting block 460. The elastic member can be a spring. The elastic member makes the mounting sleeve 470 and the mounting block 460 move away from each other, thereby making the first transmission gear 430 and the second transmission gear 450 remain meshed when the two straight plates 414 are within a certain angle range.

[0049] It needs to be explained that the vertical rod 480, the mounting sleeve 470, the mounting sleeve 470, the first transmission gear 430 and the second transmission gear 450 form a centering structure. When the cleaning assembly 400 cleans the inner wall of the heat sink 230, the friction wheel 440 rolls on the inner wall of the radiator 200. Through the transmission of the first transmission gear 430 and the second transmission gear 450, the two friction wheels 440 rotate in opposite directions at the same speed, ensuring that the vertical rod 480 is always located in the middle position of the width direction of the heat sink 230, thereby ensuring that the straight plates 414 on both sides can contact the inner wall of the heat sink 230 at the same angle and pressure, and no part of the straight plate 414 other than its side edge will contact the inner wall. The device runs smoothly, has a good scraping effect, and will not damage the inner wall of the heat sink. At the same time, the mounting block 460 and the mounting sleeve 470 tend to move away from each other, so that the elastic plate 410 tends to be stretched in the front-to-back direction. When the two straight plates 414 are against the inner wall of the heat sink, the deformation of the elastic plate 410 is mainly concentrated on the arc plate 415, while the straight plate 414 has only a slight deformation, which prevents the straight plate 414 from having an enlarged contact area with the side wall after being bent, thereby increasing wear, and also prevents the straight plate 414 from plastic bending deformation, thereby ensuring that the straight plate 414 remains straight after being used multiple times.

[0050] In a further embodiment, a reset groove 233 is provided on the inner wall of the heat sink 230, and there are multiple reset grooves 233 that correspond one-to-one to the arc segments of the heat sink 230. Along the forward direction of the cleaning component 400, the reset groove 233 is located at the front end of the arc segment (that is, the position beyond the arc segment along the forward direction), and the reset groove 233 is arc-shaped and bulges outward. When the cleaning assembly 400 passes through the arc section of the heat sink 230, the rotation speeds of the friction wheels 440 on the inner and outer sides are different, and the vertical rod 480 will shift to the middle position. When the cleaning assembly 400 passes through the arc section of the heat sink 230, it will enter the reset groove 233. Since the reset groove 233 bulges outward, the space inside the heat sink 230 becomes wider at the reset groove 233, and the straight plate 414 increases its angle under the action of its own elastic force, driving the friction wheel 440 and the first transmission gear 430 to expand outward, the second transmission gear 450 and the first transmission gear 430 to disengage, and the mounting block 460 and the mounting sleeve 470 move away from the limit position. Under the guidance of the inner wall of the arc of the reset groove 233, the cleaning assembly 400 rotates to make the vertical rod 480 return to the middle position. After passing the reset groove 233, the two straight plates 414 are retracted and approached again, and the first transmission gear 430 and the second transmission gear 450 are meshed again, and the device continues to move forward in a straight line to clean the inner wall of the heat sink 230. By setting the reset groove 233, the cleaning device can be straightened and centered when passing through the bend of the arc section, ensuring that the device runs smoothly and reliably and the inner wall is effectively scraped.

[0051] Furthermore, the heat dissipation device for the distribution transformer of the present invention also includes a heat dissipation fan 300, which is arranged on the side wall of the transformer and below the radiator 200. The heat dissipation fan 300 can accelerate the cooling of the radiator 200 and improve the heat dissipation efficiency and effect.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A heat dissipation device for a distribution transformer, characterized in that: The radiator comprises a radiator and a cleaning assembly. The radiator comprises a radiator plate, which is serpentine and hollow inside. Two pipes connected to the inside of the radiator plate are arranged on the radiator plate. The two pipes are arranged on the left and right sides of the radiator plate and are respectively located at the upper and lower ends of the radiator plate. The radiator is arranged on the outer wall of the distribution transformer. The two pipes of the radiator are connected to the oil storage cavity inside the distribution transformer. Both ends of the heat sink are provided with openings communicating with the interior thereof, and sealing covers are provided at the openings. The sealing covers can be opened, and the cleaning assembly can be inserted into the heat sink through the openings; The cleaning assembly includes an elastic plate, which includes two straight plates, one end of the two straight plates is connected and is set at an angle, and in the initial state, the opening angle of the two straight plates is greater than the width of the internal space of the heat sink; the upper and lower ends of the two straight plates are provided with friction wheels, the friction wheels are located at the front of the straight plates, the friction wheels can rotate and can elastically slide along a first direction, and the first direction is set at an angle to the extension direction of the straight plates; a driving assembly is provided on the heat sink, and the driving assembly is used to drive the cleaning assembly to move forward inside the heat sink along the direction of the heat sink, so that the straight plates scrape the inner wall of the heat sink; The cleaning assembly also includes a vertical rod, one end of the two straight plates is connected by an arc plate, the vertical rod is inserted into the arc plate, and the outer diameter of the vertical rod is smaller than the inner diameter of the arc plate; the centers of the upper and lower ends of the vertical rod are both provided with mounting sleeves, the front end of the mounting sleeve is slidably inserted with a mounting block, the lower end of the mounting block is provided with two second rotating shafts at intervals on the left and right, and the two second rotating shafts are rotatably provided with second transmission gears, and the two second transmission gears are meshed; A first transmission gear is coaxially fixedly arranged below each friction wheel, and a first rotating shaft is arranged at the lower end of the first transmission gear. The first rotating shaft can rotate and can slide a straight plate along a first direction, and the two first transmission gears can mesh with the corresponding second transmission gears; an elastic member is arranged between the mounting sleeve and the mounting block, and the elastic member makes the mounting sleeve and the mounting block move away from each other; a reset groove is arranged on the inner wall of the heat sink, and there are multiple reset grooves which correspond to the arc segments of the heat sink one by one, and the reset groove is located at the front end of the arc segment along the forward direction of the cleaning component, and the reset groove is arc-shaped and protrudes outward.

2. A heat dissipation device for a distribution transformer according to claim 1, characterized in that: The inner side walls of the two straight plates are respectively provided with mud flaps, and a plurality of mud flaps are arranged at intervals along the height direction of the straight plates. Two mud flaps at the same position on the two straight plates are stacked up and down in an offset manner.

3. The heat dissipation device for a distribution transformer according to claim 1, characterized in that: The driving assembly includes a lever, and magnets are provided at both ends of the lever. Limiting grooves are provided on the walls at both ends of the heat sink. The limiting grooves are serpentine grooves that match the direction of the heat sink, and the magnets can slide along the limiting grooves. A magnetic block is provided inside the friction wheel, and the magnet generates suction with the magnetic block inside the friction wheel.

4. A heat dissipation device for a distribution transformer according to claim 3, characterized in that: The driving assembly also includes a limiting bolt, which is threadedly connected to the magnet, and the bottom of the limiting bolt can extend into the limiting slide groove and slide in cooperation with the limiting slide groove.

5. The heat dissipation device for a distribution transformer according to claim 3, characterized in that: The radiator is made of non-magnetic metal material.

6. The heat dissipation device for a distribution transformer according to claim 1, characterized in that: The inner side surfaces of the two straight plates are provided with mounting protrusions, and a guide slot is provided in the middle of the mounting protrusions. The guide slot extends along a first direction, and a movable bearing is provided in the guide slot. The movable bearing can slide along the guide slot. A preload spring is connected between the side of the movable bearing away from the straight plate and the guide slot. The preload spring makes the movable bearing tend to move toward the direction close to the straight plate. The first rotating shaft is slidably arranged in the guide slot and is located on the side of the movable bearing close to the straight plate. An arc groove is provided on the side of the movable bearing close to the straight plate. The arc groove is adapted to the rotating shaft of the friction wheel. Under the action of the preload spring, the arc groove slides and fits with the outer peripheral wall of the friction wheel.

7. The heat dissipation device for a distribution transformer according to claim 1, characterized in that: The first direction is a direction perpendicular to the straight plate.

8. The heat dissipation device for a distribution transformer according to claim 1, characterized in that: The heat dissipation device for the distribution transformer also includes a heat dissipation fan, which is arranged on the side wall of the transformer and below the radiator.

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