Oil-immersed transformer with honeycomb heat dissipation structure

Abstract

The application relates to the technical field of transformers, and provides an oil-immersed transformer with a honeycomb heat dissipation structure, which comprises a box body, the box body comprises heat dissipation side walls oppositely arranged in the transverse direction, the heat dissipation side walls comprise a plurality of heat dissipation units arranged in the vertical direction, and the heat dissipation units are communicated with each other; the heat dissipation unit comprises a first heat dissipation pipe and a second heat dissipation pipe, the second heat dissipation pipe is arranged in the first heat dissipation pipe, an outer wall of the second heat dissipation pipe and an inner wall of the first heat dissipation pipe form a heat dissipation oil channel, a cavity of the second heat dissipation pipe forms a first air duct, and the first air duct is communicated with the outside; an oil inlet is arranged on the outer wall of the first heat dissipation pipe at the top of the heat dissipation side wall, an oil outlet is arranged on the outer wall of the first heat dissipation pipe at the bottom of the heat dissipation side wall, and the heat dissipation oil channel is communicated with the inner cavity of the box body through the oil inlet and the oil outlet. The oil-immersed transformer provided by the application not only omits the externally-hung heat dissipation fin, but also makes the installation scene of the transformer more flexible, and reduces the maintenance cost and safety risk of the transformer.

Description

Technical Field

[0001] This application relates to the field of transformer technology, and in particular to an oil-immersed transformer with a honeycomb heat dissipation structure. Background Technology

[0002] The heat dissipation performance of oil-immersed transformers directly affects their operating efficiency and service life. External heat sinks, as a traditional heat dissipation solution, have the advantages of simple structure and low cost. However, external heat sinks are usually large and occupy a lot of space, making them less suitable for compact substations or indoor installation scenarios. Furthermore, since the heat sinks are connected to the transformer body via oil pipes, long-term operation may lead to problems such as weld cracking and seal failure due to vibration, thermal expansion and contraction, or material fatigue, resulting in insulating oil leakage, increasing maintenance costs and safety risks. Summary of the Invention

[0003] In view of this, the purpose of this application is to provide an oil-immersed transformer with a honeycomb heat dissipation structure, which not only eliminates the need for external heat sinks, making the installation of the transformer more flexible, but also reduces the maintenance cost and safety risks of the transformer.

[0004] This application provides an oil-immersed transformer with a honeycomb heat dissipation structure, including:

[0005] The enclosure includes heat dissipation sidewalls arranged laterally opposite each other, and the heat dissipation sidewalls include a plurality of heat dissipation units arranged vertically, the heat dissipation units being interconnected with each other;

[0006] The heat dissipation unit includes a first heat dissipation pipe and a second heat dissipation pipe. The second heat dissipation pipe is disposed inside the first heat dissipation pipe. The outer wall of the second heat dissipation pipe and the inner wall of the first heat dissipation pipe form a heat dissipation oil channel. The cavity of the second heat dissipation pipe forms a first air channel, which is connected to the outside.

[0007] An oil inlet is provided on the outer wall of the first heat dissipation pipe at the top of the heat dissipation sidewall, and an oil outlet is provided on the outer wall of the first heat dissipation pipe at the bottom of the heat dissipation sidewall. The heat dissipation oil channel is connected to the inner cavity of the housing through the oil inlet and the oil outlet.

[0008] In some embodiments, the outer walls of the first heat dissipation pipes of adjacent heat dissipation units are connected to each other to form a second air duct, which is connected to the outside.

[0009] In some embodiments, the cooling oil channels of two adjacent heat dissipation units are interconnected to form a channel.

[0010] In some embodiments, the width of the channel gradually increases along the top to bottom direction of the heat dissipation sidewall.

[0011] In some embodiments, the inner wall of the second heat pipe is spiral-shaped.

[0012] In some embodiments, the outer wall of the heat dissipation sidewall is provided with a plurality of heat dissipation ribs, and the heat dissipation ribs are provided with heat dissipation through holes that extend vertically.

[0013] In some embodiments, a flow divider and a baffle are provided at the bottom of the inner cavity of the housing. The baffle is located on the upper surface of the flow divider and forms a second flow guiding cavity with the upper surface of the flow divider. The lower surface of the flow divider forms a first flow guiding cavity with the bottom of the housing. The first flow guiding cavity and the second flow guiding cavity are respectively connected to the oil outlet. The first flow guiding cavity and the second flow guiding cavity are used to allow insulating oil to flow to the first winding and the second winding respectively.

[0014] In some embodiments, the diverter plate is arranged laterally at the bottom of the inner wall of the housing, and divides the oil outlet into a first oil outlet and a second oil outlet. The first oil outlet is located below the second oil outlet, the first oil outlet is connected to the first guide cavity, and the second oil outlet is connected to the second guide cavity.

[0015] In some embodiments, the distributor plate is provided with a first flow guide port, which is used to accommodate the first winding, and the first flow guide port is connected to the first oil outlet through the first flow guide cavity.

[0016] In some embodiments, a second flow guide port is provided on the baffle plate, the second flow guide port is used to accommodate the second winding, and the second flow guide port is connected to the second oil outlet through the second flow guide cavity.

[0017] The beneficial effects that this application can achieve are:

[0018] The oil-immersed transformer of this application includes heat dissipation sidewalls arranged laterally opposite each other. Each heat dissipation sidewall includes multiple heat dissipation units arranged vertically and interconnected. Each heat dissipation unit includes a first heat dissipation pipe and a second heat dissipation pipe, with the second heat dissipation pipe disposed within the first heat dissipation pipe. The outer wall of the second heat dissipation pipe and the inner wall of the first heat dissipation pipe form the heat dissipation oil channel. The cavity of the second heat dissipation pipe forms a first air duct, which communicates with the outside. An oil inlet is provided on the outer wall of the first heat dissipation pipe at the top of the heat dissipation sidewall, and an oil outlet is provided on the outer wall of the first heat dissipation pipe at the bottom of the heat dissipation sidewall. The heat dissipation oil channel communicates with the inner cavity of the transformer housing through the oil inlet and the oil outlet. This application uses the heat dissipation sidewall as the heat dissipation component, eliminating the need for external heat sinks and improving the transformer's installation flexibility. Simultaneously, the insulating oil inside the transformer housing directly enters the heat dissipation oil channel within the heat dissipation sidewall through the oil inlet and outlet, eliminating the need for oil pipes and avoiding problems such as sealing failure due to weld cracking, thus reducing transformer maintenance costs and safety risks.

[0019] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 A schematic diagram of the oil-immersed transformer of this application is shown. Figure 1 ;

[0022] Figure 2 A partial schematic diagram of the oil outlet of this application is shown;

[0023] Figure 3 A front view of the oil-immersed transformer of this application is shown;

[0024] Figure 4 A partial schematic diagram of the heat dissipation unit of this application is shown;

[0025] Figure 5 A schematic diagram of the cleaning component of this application is shown;

[0026] Figure 6 A schematic diagram of the oil-immersed transformer of this application is shown. Figure 2 .

[0027] 1. Housing; 2. Heat dissipation sidewall; 3. Heat dissipation unit; 31. First heat dissipation pipe; 32. Second heat dissipation pipe; 4. Heat dissipation oil channel; 5. First air duct; 6. Oil inlet; 7. Oil outlet; 71. First oil outlet; 72. Second oil outlet; 8. Second air duct; 9. Channel; 91. First channel; 92. Second channel; 10. Heat dissipation rib; 101. Heat dissipation through hole; 11. Diverter plate; 111. First guide cavity; 112. First guide port; 12. Baffle plate; 121. Second guide cavity; 122. Second guide port; 123. First baffle plate; 124. Second baffle plate; 13. Impurity removal port; 14. Stirring rod; 15. Impurity removal component; 151. Fixing rod; 152. Impurity suction plate; 16. First movable plate; 17. Second movable plate. Detailed Implementation

[0028] The term "comprising" in the specification, claims, and accompanying drawings of this application is synonymous with "including," "containing," or "characterized in," and is inclusive of endpoints or open-ended, and does not exclude additional unstated elements or method steps. "Comprising" is a technical term used in the language of the claims, meaning that the stated element is present, but other elements may be added and still form a construction or method within the scope of the claims.

[0029] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. In addition, the terms "first", "second", "third", etc. are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0030] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0031] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0032] This application mentions an oil-immersed transformer with a honeycomb heat dissipation structure, including: a housing 1, the housing 1 including heat dissipation sidewalls 2 arranged laterally opposite each other, the heat dissipation sidewalls 2 including a plurality of heat dissipation units 3 arranged vertically, and the heat dissipation units 3 being interconnected.

[0033] For example, such as Figure 1 , 3 As shown, the enclosure 1 includes two opposing heat dissipation sidewalls 2, each composed of multiple vertically arranged heat dissipation units 3. Each heat dissipation unit 3 extends longitudinally, and the multiple heat dissipation units 3 form a porous structure with micro-support beams to ensure the structural strength of the enclosure 1. However, simply making the heat dissipation sidewalls 2 of the enclosure 1 porous does not improve the efficiency of heat exchange between the insulating oil inside the enclosure 1 and the outside environment. To address this issue, taking advantage of the large contact area between the porous structure and the air, heat dissipation oil channels 4 are provided within the heat dissipation sidewalls 2 to allow the insulating oil to flow. This increases the contact area between the insulating oil and the air as it flows within the heat dissipation oil channels 4, thereby improving heat dissipation efficiency. Therefore, the heat dissipation unit 3 must possess both sufficient supporting strength and oil channels to accommodate the flow of insulating oil.

[0034] Therefore, as Figure 4 As shown, the heat dissipation unit 3 includes a first heat dissipation pipe 31 and a second heat dissipation pipe 32. The second heat dissipation pipe 32 is disposed inside the first heat dissipation pipe 31. The outer wall of the second heat dissipation pipe 32 and the inner wall of the first heat dissipation pipe 31 form a heat dissipation oil channel 4. The cavity of the second heat dissipation pipe 32 forms a first air channel 5, which is connected to the outside.

[0035] For example, both the first heat dissipation pipe 31 and the second heat dissipation pipe 32 are hexagonal tubular. The geometry of the honeycomb structure can evenly distribute external impacts or internal pressures to multiple honeycomb unit walls, avoiding stress concentration on a single plane, reducing the risk of honeycomb structure deformation or breakage, and the honeycomb structure has a large contact area with air, which can meet the heat dissipation efficiency requirements of the heat dissipation sidewall 2. The first heat dissipation pipe 31 and the second heat dissipation pipe 32 are nested to form a heat dissipation oil channel 4. When the insulating oil flows in the heat dissipation oil channel 4, it exchanges heat with the air in the first air channel 5 through the pipe wall of the second heat dissipation pipe 32, and the outer wall of the first heat dissipation pipe 31 is also in contact with the outside, and air will flow over the outer surface of the first heat dissipation pipe 31, carrying away some of the heat of the insulating oil. Under the cooling effect of the dual air, the purpose of rapidly cooling the insulating oil can be achieved.

[0036] In some embodiments, the first heat pipe 31 and the second heat pipe 32 are quadrilateral structures.

[0037] An oil inlet 6 is provided on the outer wall of the first heat dissipation pipe 31 at the top of the heat dissipation sidewall 2, and an oil outlet 7 is provided on the outer wall of the first heat dissipation pipe 31 at the bottom of the heat dissipation sidewall 2. The heat dissipation oil channel 4 is connected to the inner cavity of the housing 1 through the oil inlet 6 and the oil outlet 7.

[0038] For example, both the oil inlet 6 and the oil outlet 7 are elongated and extend in the same direction as the heat dissipation unit 3. In an oil-immersed transformer, the heating of the windings raises the temperature of the insulating oil in the tank 1. The heated insulating oil rises to the top of the tank 1 and enters the heat dissipation oil channel 4 through the oil inlet 6 at the top of the heat dissipation sidewall 2. It then flows to the bottom of the heat dissipation sidewall 2. During the flow, the insulating oil exchanges heat with the air through the first air duct 5 to gradually cool down. The cooled insulating oil enters the inner cavity of the tank 1 from the oil outlet 7 at the bottom of the heat dissipation sidewall 2. Under the action of the windings, it is heated and continues to rise, forming a circulating flow of insulating oil.

[0039] Therefore, this application provides an oil-immersed transformer with a honeycomb heat dissipation structure. Multiple longitudinally extending heat dissipation units 3 are arranged vertically to form a heat dissipation sidewall 2. Nested honeycomb-shaped first heat dissipation pipes 31 and second heat dissipation pipes 32 form a heat dissipation oil channel 4. An oil inlet 6 and an oil outlet 7 connect the heat dissipation oil channel 4 to the inner cavity of the tank 1, allowing heated insulating oil to enter the heat dissipation oil channel 4 from the oil inlet 6 and flow through the channel to the outlet 7, returning to the tank 1. The insulating oil exchanges heat with the air in the first air duct 5 while flowing within the heat dissipation oil channel 4, thus reducing its temperature. The insulating oil within the tank 1 circulates using the natural convection phenomenon of "heat rise and cooling drop," maintaining a stable temperature. The oil-immersed transformer of this application uses a honeycomb-shaped heat dissipation sidewall 2 instead of the common external heat sink to cool the insulating oil in the tank 1. This reduces the limitation of the transformer tank in terms of space size. Furthermore, the oil channel 4 for insulating oil to enter the heat dissipation sidewall 2 does not need to be connected to an oil pipe, avoiding the risk of cracking at the connection between the oil pipe and the tank 1, and improving the safety of transformer operation.

[0040] In some embodiments, the outer walls of the first heat dissipation pipes 31 of adjacent heat dissipation units 3 are connected to each other to form a second air duct 8, which is connected to the outside.

[0041] For example, the outer walls of adjacent heat dissipation units 3 are connected to each other to form a quadrilateral cavity. The two ends of the quadrilateral cavity are connected to the outside to form a second air duct 8. Air can circulate in the second air duct 8. The insulating oil in the heat dissipation oil duct 4 exchanges heat with the air in the second air duct 8 through the pipe wall of the first heat dissipation pipe 31. The flowing air will carry away the remaining heat in the insulating oil and further reduce the temperature of the insulating oil.

[0042] The housing 1 of the oil-immersed transformer is made of steel. Steel has good supporting performance but poor corrosion resistance. Therefore, it is necessary to apply anti-corrosion paint to the inner wall of the air duct.

[0043] In some embodiments, the cooling oil channels 4 of two adjacent heat dissipation units 3 are interconnected to form a channel 9.

[0044] For example, such as Figure 4 As shown, the heat dissipation sidewall 2 includes two rows of heat dissipation units 3 arranged laterally. The sidewalls of adjacent rows of heat dissipation units 3 are laterally connected, specifically, the first heat dissipation pipes 31 of two adjacent heat dissipation units 3 are connected through a first channel 91. Two adjacent heat dissipation units 3 are vertically connected by sharing a vertex, and the pipe walls of the first heat dissipation pipes 31 at the connection point are connected through a second channel 92. The lateral and vertical connections of the first heat dissipation pipes 31 of the heat dissipation units 3 are all welded to ensure the airtightness of the connection.

[0045] Specifically, when the insulating oil in the housing 1 enters the heat dissipation oil channel 4 through the oil inlet 6, part of the insulating oil flows longitudinally along the first channel 91 into the adjacent heat dissipation unit 3, and the other part of the insulating oil flows transversely through the second channel 92 into the adjacent heat dissipation unit 3.

[0046] In some embodiments, the width of the channel 9 gradually increases along the top to bottom direction of the heat dissipation sidewall 2.

[0047] The heated insulating oil inside the housing 1 flows through the heat dissipation sidewall 2 and becomes cooled insulating oil. Since the fluidity of the insulating oil is directly related to temperature, the fluidity of the insulating oil decreases closer to the bottom of the heat dissipation sidewall 2. Therefore, the width of the second channel 92 gradually increases from the top to the bottom of the heat dissipation sidewall 2 to ensure that the insulating oil flows smoothly back into the housing 1 within the heat dissipation sidewall 2 to cool the windings. Furthermore, to further reduce the resistance during the flow of the insulating oil, the inner wall of the channel 9 is smoothed to increase the flow rate and improve heat dissipation efficiency.

[0048] In some embodiments, the inner wall of the second heat pipe 32 has a spiral groove.

[0049] When the insulating oil exchanges heat with the air in the first air duct 5 during its flow, the smooth inner wall of the second heat dissipation pipe 32, while increasing the airflow speed, creates a laminar boundary layer between the cold air and the hot wall of the second heat dissipation pipe 32, hindering the efficiency of heat exchange. To break this laminar boundary layer, spiral grooves are provided on the inner wall of the second heat dissipation pipe 32. These grooves facilitate the transition of airflow from laminar to turbulent flow. The stronger lateral mixing ability of turbulence allows for more efficient mixing of the low-temperature airflow at the center of the first air duct 5 with the high-temperature airflow on the wall of the second heat dissipation pipe 32, thereby increasing the convective heat transfer coefficient and improving heat exchange efficiency. Furthermore, the airflow within the spiral grooves generates a spiral airflow, which produces a secondary flow perpendicular to the main flow direction, increasing the contact area and contact time between the airflow and the wall surface.

[0050] In some embodiments, the outer wall of the heat dissipation sidewall 2 is provided with multiple sets of heat dissipation ribs 10, and the heat dissipation ribs 10 are provided with heat dissipation through holes 101 inside, and the heat dissipation through holes 101 are arranged vertically.

[0051] To increase the structural strength of the heat dissipation sidewall 2, an outer protective plate is installed on the air side of the heat dissipation sidewall 2. The outer protective plate is generally made of cold-rolled steel sheet by direct stamping. The air side of the outer protective plate is a smooth heat exchange surface with high thermal resistance. Based on this, multiple sets of rectangular heat dissipation ribs 10 are arranged vertically on the air side of the outer protective plate. The arrangement of the heat dissipation ribs 10 not only disrupts the laminar boundary layer and promotes turbulence, but also expands the heat dissipation area, thereby improving the heat exchange capacity of the outer protective plate. However, adding heat dissipation ribs 10 will hinder airflow and increase the weight of the outer protective plate. Therefore, rectangular heat dissipation through holes 101 are arranged vertically inside the heat dissipation ribs 10, which can not only reduce weight, but also reduce wind resistance.

[0052] In some optional embodiments, the heat dissipation ribs 10 are independently arranged in a serrated pattern along the vertical direction, while two adjacent rows of heat dissipation ribs 10 are arranged crosswise along the vertical direction.

[0053] In some alternative embodiments, such as Figure 6 As shown, a flow divider 11 and a flow baffle 12 are provided at the bottom of the inner cavity of the housing 1. The flow baffle 12 is located on the upper surface of the flow divider 11 and forms a second flow guide cavity 121 with the upper surface of the flow divider 11. The lower surface of the flow divider 11 forms a first flow guide cavity 111 with the bottom of the housing 1. The first flow guide cavity 111 and the second flow guide cavity 121 are respectively connected to the oil outlet 7. The first flow guide cavity 111 and the second flow guide cavity 121 are used to allow the insulating oil to flow to the first winding and the second winding respectively.

[0054] In an oil-immersed transformer, the three-phase windings are typically arranged side-by-side, with heat dissipation sidewalls 2 positioned on either side of the windings. Insulating oil flows back from the heat dissipation sidewalls 2 into the housing 1, first reaching the two windings closest to the heat dissipation sidewalls 2, thus causing uneven cooling of the three-phase windings. To address this, a diversion plate 11 is horizontally positioned at the oil outlet 7. The diversion plate 11 is connected to the bottom wall of the housing 1, and its lower surface forms a sealed first guide cavity 111 with the bottom wall of the housing 1. The first guide cavity 111 is connected to the heat dissipation oil channel 4 through the oil outlet 7. Therefore, the cooled insulating oil flowing from the oil outlet 7 is guided by the first guide cavity 111 to its center position, which corresponds to the position of the first winding. The cooled insulating oil is then transported to the first winding.

[0055] To ensure that the second winding also receives sufficient cooling insulating oil, a baffle plate 12 is installed on the upper surface of the shunt plate 11. The baffle plate 12 includes a first baffle plate 123 and a second baffle plate 124. One end of the first baffle plate 123 is connected to the heat dissipation sidewall 2, and the other end is connected to the second baffle plate 124. The first baffle plate 123 and the upper surface of the shunt plate 11 form a second flow guiding cavity 121. The second flow guiding cavity 121 guides the insulating oil flowing horizontally from the oil outlet 7. The second baffle plate 124 blocks the insulating oil in the second flow guiding cavity 121 from flowing to the first winding, thus ensuring the cooling effect of the insulating oil on the second winding. The second winding is a two-phase winding close to the heat dissipation sidewall 2, and the first winding is located between the second winding.

[0056] In some embodiments, the diverter plate 11 is arranged laterally at the bottom of the inner wall of the housing 1, and divides the oil outlet 7 into a first oil outlet 71 and a second oil outlet 72. The first oil outlet 71 is located below the second oil outlet 72. The first oil outlet 71 is connected to the first guide cavity 111, and the second oil outlet 72 is connected to the second guide cavity 121.

[0057] For example, such as Figure 2 As shown, the diverter plate 11 divides the oil outlet 7 into two parts. Thus, the insulating oil in the heat dissipation oil channel 4 is also divided into two parts when it passes through the oil outlet 7. The part of the cooled insulating oil flowing out from the first oil outlet 71 flows relative to each other in the first guide cavity 111 to the middle position of the first guide cavity 111; the insulating oil flowing out from the second oil outlet 72 accumulates in the second guide cavity 121.

[0058] In some embodiments, the flow divider 11 is provided with a first flow guide 112, which is used to accommodate the first winding. The first flow guide 112 is connected to the first oil outlet 71 through the first flow guide cavity 111.

[0059] For example, insulating oil flowing out from the first oil outlet 71 flows into the first guide cavity 111. Guided by the first guide cavity 111, it flows to the first guide port 112 and flows upward along the surface of the first winding, reducing the heat of the first winding. The diameter of the first guide port 112 is larger than the diameter of the first winding. Due to the shape limitation of the first guide port 112, the insulating oil in the first guide cavity 111 can only flow along the surface of the first winding.

[0060] In some embodiments, the baffle plate 12 is provided with a second flow guide 122, which is used to accommodate the second winding. The second flow guide 122 is connected to the second oil outlet 72 through the second flow guide cavity 121.

[0061] For example, the insulating oil flowing out from the second oil outlet 72 flows along the second guide cavity 121 to the second guide port 122 and then flows out, flowing along the surface of the second winding to the top of the housing 1, reducing the temperature of the second winding. The diameter of the second guide port 122 is larger than the diameter of the second winding, and the insulating oil in the second guide cavity 121 can only flow along the surface of the second winding due to the shape restriction of the second guide port 122.

[0062] The specific working principle is as follows: the insulating oil in the oil-immersed transformer is heated by the winding and floats to the top of the tank 1. It enters the cooling oil channel 4 through the oil inlet 6 at the top of the heat dissipation side wall 2. When the oil flows from the top to the bottom of the heat dissipation side wall 2 in the cooling oil channel 4, the heat of the insulating oil is exchanged with the air in the first air duct 5 and the second air duct 8 through the pipe walls of the first heat dissipation pipe 31 and the second heat dissipation pipe 32, thereby cooling the insulating oil. When the cooled insulating oil flows back into the housing 1 through the oil outlet 7 at the bottom of the heat dissipation sidewall 2, the oil outlet 7 is divided into a first oil outlet 71 and a second oil outlet 72 by the diversion plate 11. Therefore, the insulating oil is also divided into two parts by the diversion plate 11. One part enters the first guide cavity 111 through the first oil outlet 71. The first guide cavity 111 is equipped with a horizontally arranged stirring rod 14, which can accelerate the flow of insulating oil to the first guide port 112. The insulating oil flows out from the first guide port 112 and flows along the periphery of the first winding towards the top of the housing 1. During the flow, it exchanges heat with the first winding and reduces the temperature of the first winding. The other part of the insulating oil flows naturally in the second guide cavity 121 to the second guide port 122. The insulating oil flows out from the second guide port 122 and flows upward along the periphery of the first winding, completing the cooling work of the second winding.

[0063] In some alternative embodiments, such as Figure 3 As shown, a horizontal stirring rod 14 is provided in the first flow guiding cavity 111. The stirring rod 14 can accelerate the flow of insulating oil in the first flow guiding cavity 111, so that the insulating oil flowing out of the first oil outlet 71 can quickly reach the first winding, avoiding uneven cooling between the first winding and the second winding due to the time difference in the arrival of insulating oil.

[0064] However, the stirring rod 14 stirs up impurities that have settled at the bottom of the housing 1 during rotation, and these floating impurities can damage the windings. Therefore, a debris removal component 15 is installed on the lower surface of the distributor plate 11, such as... Figure 5 As shown, the impurity removal component 15 includes a fixing rod 151 and an impurity suction plate 152 arranged in the radial direction of the fixing rod 151. The surface of the impurity suction plate 152 is provided with small spikes, which can facilitate the adhesion of impurities to the impurity suction plate. The impurity removal component 15 is made of magnetic material. When energized, the impurity removal component 15 will generate magnetism, which can adsorb impurities flowing near the impurity removal component 15, thereby achieving the purpose of reducing impurities in the insulating oil.

[0065] In some optional embodiments, a first movable plate 16 is provided at the oil outlet 7, the first movable plate 16 being used to close or open the oil outlet 7; a second movable plate 17 is provided at the first guide port 112, the second movable plate being used to close or open the first guide port 112.

[0066] When impurity removal is required inside the housing 1, the first movable plate 16 and the second movable plate 17 are driven to close the oil outlet 7 and the first guide port 112, so that the first guide cavity 111 forms a sealed cavity. Then, the impurity removal component 15 is de-energized to demagnetize it, and the stirring rod 14 is driven to rotate. Under the action of the stirring rod 14, the impurities on the impurity removal component 15 rotate with the insulating oil in the first guide cavity 111. Then, the impurity removal port 13 at the bottom of the housing 1 is opened to discharge the insulating oil in the first guide cavity 111. After the insulating oil in the first guide cavity 111 is completely discharged, the impurity removal port 13 is closed, the impurity removal component 15 is re-energized, and the oil outlet 7 and the first guide port 112 are opened to allow the insulating oil to start circulating again. The enclosure 1 is equipped with a cleaning component 15, a first movable plate 16, and a second movable plate 17. This allows the cleaning of the insulating oil in the enclosure 1 to be reduced to a localized cleaning process. When it is necessary to clean the impurities in the insulating oil, it is not necessary to drain all the insulating oil in the enclosure 1. Only the insulating oil containing the most impurities is drained, which effectively saves the use of insulating oil.

[0067] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. An oil-immersed transformer with a honeycomb heat dissipation structure, characterized in that, include: The enclosure (1) includes heat dissipation sidewalls (2) arranged laterally opposite each other, and the heat dissipation sidewalls (2) include a plurality of heat dissipation units (3) arranged vertically, and the heat dissipation units (3) are connected to each other; The heat dissipation unit (3) includes a first heat dissipation pipe (31) and a second heat dissipation pipe (32). The second heat dissipation pipe (32) is disposed inside the first heat dissipation pipe (31). The outer wall of the second heat dissipation pipe (32) and the inner wall of the first heat dissipation pipe (31) form a heat dissipation oil channel (4). The cavity of the second heat dissipation pipe (32) forms a first air channel (5). The first air channel (5) is connected to the outside. An oil inlet (6) is provided on the outer wall of the first heat dissipation pipe (31) at the top of the heat dissipation sidewall (2), and an oil outlet (7) is provided on the outer wall of the first heat dissipation pipe (31) at the bottom of the heat dissipation sidewall (2). The heat dissipation oil channel (4) is connected to the inner cavity of the box body (1) through the oil inlet (6) and the oil outlet (7). The outer walls of the first heat dissipation pipes (31) of adjacent heat dissipation units (3) are connected to each other to form a second air duct (8), and the second air duct (8) is connected to the outside. The heat dissipation oil channels (4) of two adjacent heat dissipation units (3) are interconnected to form a channel (9).

2. An oil-immersed transformer with a honeycomb heat dissipation structure according to claim 1, characterized in that, The width of the channel (9) gradually increases from the top to the bottom along the heat dissipation sidewall (2).

3. An oil-immersed transformer with a honeycomb heat dissipation structure according to claim 2, characterized in that, The inner wall of the second heat sink (32) is spiral-shaped.

4. An oil-immersed transformer with a honeycomb heat dissipation structure according to claim 3, characterized in that, Multiple sets of heat dissipation ribs (10) are provided on the outer wall of the heat dissipation sidewall (2). The heat dissipation ribs (10) are provided with heat dissipation through holes (101) inside, and the heat dissipation through holes (101) extend vertically.

5. An oil-immersed transformer with a honeycomb heat dissipation structure according to claim 1, characterized in that, The bottom of the inner cavity of the housing (1) is provided with a flow divider (11) and a flow baffle (12). The flow baffle (12) is located on the upper surface of the flow divider (11) and forms a second flow guide cavity (121) with the upper surface of the flow divider (11). The lower surface of the flow divider (11) forms a first flow guide cavity (111) with the bottom of the housing (1). The first flow guide cavity (111) and the second flow guide cavity (121) are respectively connected to the oil outlet (7). The first flow guide cavity (111) and the second flow guide cavity (121) are used to allow the insulating oil to flow to the first winding and the second winding respectively.

6. An oil-immersed transformer with a honeycomb heat dissipation structure according to claim 5, characterized in that, The diverter plate (11) is arranged horizontally at the bottom of the inner wall of the box (1) and divides the oil outlet (7) into a first oil outlet (71) and a second oil outlet (72). The first oil outlet (71) is located below the second oil outlet (72). The first oil outlet (71) is connected to the first guide cavity (111), and the second oil outlet (72) is connected to the second guide cavity (121).

7. An oil-immersed transformer with a honeycomb heat dissipation structure according to claim 6, characterized in that, The flow divider plate (11) is provided with a first flow guide port (112), which is used to accommodate the first winding. The first flow guide port (112) is connected to the first oil outlet (71) through the first flow guide cavity (111).

8. An oil-immersed transformer with a honeycomb heat dissipation structure according to claim 7, characterized in that, The baffle plate (12) is provided with a second flow guide (122), which is used to accommodate the second winding. The second flow guide (122) is connected to the second oil outlet (72) through the second flow guide cavity (121).

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