Heat dissipation structure for transformer and oil-immersed transformer

Abstract

This application belongs to the field of transformer technology and discloses a heat dissipation structure for transformers and an oil-immersed transformer. The heat dissipation structure includes a first flow channel, a second flow channel, a third flow channel, and multiple heat dissipation fins. The multiple heat dissipation fins are funnel-shaped and arranged parallel to each other. Each heat dissipation fin has a through hole in its center, and the interior of the multiple through holes forms a heat-generating zone for accommodating the transformer coils and core. The first flow channel is vertically located between the center of the heat dissipation fin and the heat-generating zone. The second flow channel is vertically located on the side of the heat dissipation fin away from the center of the heat-generating zone. An inclined flow channel connecting the first and second flow channels is formed between the multiple heat dissipation fins. The first, second, and third flow channels, as well as the inclined flow channel, are all used for circulating transformer oil. The third flow channel is connected to both ends of the first and second flow channels and is located on the side away from the heat-generating zone to achieve heat dissipation of the transformer oil. Overall, it can effectively improve the heat dissipation effect of the oil-immersed transformer.

Description

Technical Field

[0001] This application relates to the field of transformer technology, and more specifically, to a heat dissipation structure for a transformer and an oil-immersed transformer. Background Technology

[0002] During operation, oil-immersed transformers generate significant Joule heat and iron loss heat from their core, windings, and other electromagnetic components. To ensure the stability of the transformer's insulating oil performance and prevent internal components from overheating and causing insulation aging or breakdown, a heat dissipation structure is an essential component of oil-immersed transformers. Currently, the industry's conventional heat dissipation solutions mostly employ natural or forced oil circulation structures. Relying on tank walls, external heat dissipation fins, and heat pipes, the insulating oil exchanges heat with the outside air during its flow, thus dissipating internal heat to the outside. Existing heat dissipation structures, after long-term application, have the advantage of low processing costs and are widely used in oil-immersed transformers of various voltage levels.

[0003] Currently, conventional oil-immersed transformer heat dissipation structures, in actual use, cannot completely dissipate the internal heat carried by the insulating oil under long-term full-load or overload operation conditions. This leads to a continuous increase in the internal temperature of the oil tank, which not only accelerates the deterioration of the insulating oil and shortens the overall service life of the transformer, but may also cause safety hazards such as overheating damage to the winding insulation layer and partial discharge. They cannot meet the heat dissipation requirements of high-load operation scenarios and high-temperature environment application scenarios, thus limiting the operational stability and applicable scenarios of oil-immersed transformers. Summary of the Invention

[0004] The purpose of this application is to provide a heat dissipation structure for transformers and an oil-immersed transformer, which solves the technical problem that the heat dissipation effect of existing oil-immersed transformers is generally poor, and achieves the technical effect of improving the heat dissipation effect of oil-immersed transformers.

[0005] In a first aspect, embodiments of this application provide a heat dissipation structure for a transformer, including a first flow channel, a second flow channel, a third flow channel, and multiple heat dissipation fins. The multiple heat dissipation fins are funnel-shaped and arranged parallel to each other. Each heat dissipation fin has a through hole in its center, and the through hole of the multiple heat dissipation fins has a heat-generating zone for accommodating the transformer coil and core. The first flow channel is vertically arranged between the center of the multiple heat dissipation fins and the heat-generating zone. The second flow channel is vertically arranged on the side of the multiple heat dissipation fins away from the center of the heat-generating zone. An inclined flow channel is formed between the multiple heat dissipation fins to connect the first flow channel and the second flow channel. The first flow channel, the second flow channel, the third flow channel, and the inclined flow channel are used to circulate transformer oil. The third flow channel is connected to both ends of the first flow channel and the second flow channel, and the third flow channel is located on the side away from the heat-generating zone to dissipate heat from the transformer oil.

[0006] In one possible implementation, the lowest heat dissipation fin among the multiple heat dissipation fins is provided with a sealing fin in the circumferential direction, and the sealing fin is sealed to the sidewall of the second flow channel.

[0007] In another possible implementation, the sidewall of the connecting section at the bottom of the third flow channel and the first and second flow channels is flush with the height of the sealing fins. A transverse filter assembly is provided in the connecting section at the bottom of the third flow channel and the first and second flow channels. The transverse filter assembly is connected to the sidewall of the third flow channel by a threaded seal. The end of the transverse filter assembly has an inclined surface that abuts against the sidewall of the heat dissipation fins. The top of the transverse filter assembly has a top sealing surface that fits against the bottom of the sealing fins. When the transformer oil flows through the connecting section at the bottom of the third flow channel and the first and second flow channels, it can flow through the transverse filter assembly for filtration.

[0008] In another possible implementation, a filter is provided between the center of each heat dissipation fin and the coil and / or iron core of the heat generation zone. The filter has a first microporous structure for filtering transformer oil. The filter is used to filter the transformer oil flowing through the first flow channel and to increase the flow resistance of the transformer oil in the first flow channel so that the transformer oil can flow through the inclined flow channel.

[0009] In another possible implementation, the transverse filter assembly is provided with a second microporous structure for filtering transformer oil. The micropore diameter of the second microporous structure is larger than that of the first microporous structure, so as to filter the transformer oil step by step through the transverse filter assembly and the filter sheet.

[0010] In another possible implementation, multiple heat dissipation fins extend to the outside of the sidewall of the second flow channel to form external fins, which are located between the sidewall of the second flow channel and the sidewall of the third flow channel; the first flow channel is vertically located between the center of the multiple heat dissipation fins and the heat generation area, and the second flow channel is vertically located on the side of the multiple heat dissipation fins away from the heat generation area.

[0011] In another possible implementation, the outer fins are provided with drainage holes for draining rainwater.

[0012] In another possible implementation, a vertical filter assembly is also included. The vertical filter assembly is vertically arranged in the second flow channel and is connected to the top of the connection section between the second and third flow channels by a threaded seal. The horizontal filter assembly is provided with a third microporous structure for filtering transformer oil. The micropore diameter of the third microporous structure is larger than that of the first microporous structure, so as to filter the transformer oil step by step through the horizontal filter assembly and the filter sheet.

[0013] In another possible implementation, a blockage clearing controller is also included. A temperature sensor for detecting transformer oil temperature is provided on the third flow channel. The temperature sensor and the blockage clearing controller are electrically connected. When the temperature sensor detects that the transformer oil temperature is greater than or equal to the preset transformer oil temperature, the blockage clearing controller issues a prompt message for replacing the horizontal or vertical filter assembly.

[0014] Secondly, embodiments of this application provide an oil-immersed transformer, including the aforementioned heat dissipation structure for the transformer, and also including a coil and an iron core, wherein the coil and the iron core are disposed within the heat generation zone.

[0015] The beneficial effects of the embodiments of this application compared with the prior art are: This application provides a heat dissipation structure for a transformer. Multiple heat dissipation fins are funnel-shaped and arranged parallel to each other. Each heat dissipation fin has a through hole in its center, and the through holes of the multiple heat dissipation fins contain a heat-generating zone for accommodating the transformer's coils and core. A first flow channel is vertically positioned between the center of the multiple heat dissipation fins and the heat-generating zone. A second flow channel is vertically positioned on the side of the multiple heat dissipation fins away from the center of the heat-generating zone. An inclined flow channel is formed between the multiple heat dissipation fins, connecting the first and second flow channels. The first, second, third, and inclined flow channels are used to circulate transformer oil. The third flow channel is connected to both ends of the first and second flow channels, and is positioned on the side away from the heat-generating zone to dissipate heat from the transformer oil. In this embodiment, the transformer oil can first enter the first flow channel to fully contact the surface of the heat-generating zone and absorb heat. Then, the hot oil flows along the inclined flow channel to the second flow channel, where it fully contacts the funnel-shaped heat dissipation fins to conduct heat. Finally, the hot oil enters the third flow channel to complete the cooling process. Overall, this can significantly improve the heat transfer efficiency, quickly remove the heat generated by the transformer coils and core, and avoid the problem of localized overheating in the heat-generating zone. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic cross-sectional view of the first heat dissipation structure for a transformer provided in this application embodiment; Figure 2 A partial structural diagram at point A of the first heat dissipation structure for a transformer provided in the embodiments of this application; Figure 3A schematic cross-sectional view of a second heat dissipation structure for a transformer provided in an embodiment of this application; Figure 4 A schematic diagram of the cross-sectional structure of a third heat dissipation structure for a transformer provided in an embodiment of this application; Figure 5 A partial structural diagram at point B of the third heat dissipation structure for a transformer provided in this application embodiment; Figure 6 This is a schematic diagram of a control structure for a heat dissipation structure of a transformer, provided as an embodiment of this application. Detailed Implementation

[0018] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0019] It should be noted that when a component or structure is referred to as being "fixed to" or "set on" another component or structure, it can be directly on or indirectly on the other component or structure. When a component or structure is referred to as being "connected to" another component or structure, it can be directly connected to or indirectly connected to the other component or structure.

[0020] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device, component, or structure referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0022] Currently, conventional oil-immersed transformer heat dissipation structures cannot meet the heat dissipation requirements of high-load operation scenarios and high-temperature environment application scenarios.

[0023] Based on the above reasons, this application provides a heat dissipation structure for a transformer, including a first flow channel, a second flow channel, a third flow channel, and multiple heat dissipation fins. The multiple heat dissipation fins are funnel-shaped and arranged parallel to each other. Each heat dissipation fin has a through hole in its center, and the through hole of the multiple heat dissipation fins has a heat-generating zone for accommodating the transformer coil and core. The first flow channel is vertically arranged between the center of the multiple heat dissipation fins and the heat-generating zone. The second flow channel is vertically arranged on the side of the multiple heat dissipation fins away from the center of the heat-generating zone. An inclined flow channel is formed between the multiple heat dissipation fins to connect the first flow channel and the second flow channel. The first flow channel, the second flow channel, the third flow channel, and the inclined flow channel are used to circulate transformer oil. The third flow channel is connected to both ends of the first flow channel and the second flow channel, and the third flow channel is located on the side away from the heat-generating zone to dissipate heat from the transformer oil. In this embodiment, the transformer oil can first enter the first flow channel to fully contact the surface of the heat-generating zone and absorb heat. Then, the hot oil flows along the inclined flow channel to the second flow channel, where it fully contacts the funnel-shaped heat dissipation fins to conduct heat. Finally, the hot oil enters the third flow channel to complete the cooling process. Overall, this can significantly improve the heat transfer efficiency, quickly remove the heat generated by the transformer coils and core, and avoid the problem of localized overheating in the heat-generating zone.

[0024] In some scenarios, a heat dissipation structure for transformers according to an embodiment of this application can be applied to oil-immersed transformers in urban substations. It can quickly dissipate the high heat generated by the coils and cores during high-load operation, reducing the risk of equipment overheating failure.

[0025] In other scenarios, the heat dissipation structure for transformers according to the embodiments of this application can also be applied to outdoor wind power supporting step-up transformers, adapting to outdoor conditions with large temperature differences and high loads, and ensuring the long-term stable operation of wind power grid-connected equipment.

[0026] The following describes in detail a heat dissipation structure for a transformer provided in the embodiments of this application, using specific examples.

[0027] Figure 1 This is a schematic cross-sectional view of the first heat dissipation structure for a transformer provided in an embodiment of this application. Figure 2 A partial structural diagram at point A of the first heat dissipation structure for a transformer provided in this application embodiment is shown below. Figure 1 and Figure 2 As shown in the figure, this application provides a heat dissipation structure for a transformer, which will be described in detail below.

[0028] In some implementations, the heat dissipation structure for the transformer includes a first flow channel 11, a second flow channel 12, a third flow channel 13, and multiple heat dissipation fins 14. The multiple heat dissipation fins 14 are funnel-shaped and arranged in parallel to each other. Each heat dissipation fin 14 has a through hole 141 in the middle. The through hole 141 of the multiple heat dissipation fins 14 has a heat generation zone 2 for accommodating the coil and core of the transformer.

[0029] In this implementation, the cooling structure can be arranged with multiple heat dissipation fins 14, which are funnel-shaped and arranged in parallel to each other.

[0030] It should be noted that the overall size of the funnel-shaped heat dissipation fins 14 gradually increases along the flow direction of the cooling medium. The parallel arrangement of the fins ensures that a stable flow guide gap is formed between adjacent heat dissipation fins 14, allowing the cooling medium to flow evenly along the gap and carry away the heat transferred from the heat-generating components.

[0031] For example, the large-diameter ends of the multiple heat dissipation fins 14 face the outflow direction of the cooling medium, and the small-diameter ends face the inflow direction of the cooling medium. The axes of each heat dissipation fin 14 coincide, and adjacent heat dissipation fins 14 are fixedly connected with a uniform spacing to form a continuous, gradually expanding flow guide gap.

[0032] In this implementation, a through hole 141 is provided in the middle of each heat dissipation fin 14.

[0033] It should be noted that the through hole 141 extends through the fin body along the axial direction of the heat dissipation fin 14. The outline of the through hole can be adapted to the outer outline of the component to be accommodated, providing installation space for the component to be accommodated. At the same time, the component to be accommodated can be wrapped around the center of multiple heat dissipation fins 14, shortening the heat transfer path.

[0034] For example, the through hole 141 at the axis position of the heat dissipation fin 14 is a circular straight hole. The inner diameter of the through hole 141 of all heat dissipation fins 14 is the same. After multiple heat dissipation fins 14 are spliced ​​together, the through hole 141 can jointly form a continuous hollow space.

[0035] In this implementation, a heat-generating zone 2 for accommodating the transformer coil and core is provided in the through holes 141 of the multiple heat dissipation fins 14.

[0036] It should be noted that the heat generation zone 2 is surrounded by through holes 141 of multiple heat dissipation fins 14, which can enclose the core heat generation components of the transformer during operation inside the space. The heat dissipated by the heat generation components can be directly transferred to the surrounding heat dissipation fins 14, and then heat exchange is completed through the heat dissipation fins 14 and the cooling medium in the flow channel.

[0037] In some implementations, the first flow channel 11 is vertically disposed between the center of the plurality of heat dissipation fins 14 and the heat generation zone 2, and the second flow channel 22 is vertically disposed on the side of the plurality of heat dissipation fins 11 away from the center of the heat generation zone 2, and an inclined flow channel 142 connecting the first flow channel 11 and the second flow channel 12 is formed between the plurality of heat dissipation fins 14.

[0038] In this implementation, the first flow channel 11 is arranged in the vertical direction and is located between the center of multiple heat dissipation fins 14 and the heat generation zone 2.

[0039] It should be noted that the first flow channel 11 is located close to the heat generation zone 2, which can directly absorb the heat emitted by the transformer coil and iron core in the heat generation zone 2, shorten the transfer path of the initial heat exchange, and the cooling medium can flow continuously in the first flow channel 11 in the vertical direction.

[0040] For example, the first flow channel 11 is a vertically extending annular hollow channel, which is arranged coaxially with the entire structure and multiple heat dissipation fins 14. The first flow channel 11 can be formed by surrounding the circumferential area of ​​the heat generation zone 2 and the inner diameter of the heat dissipation fins 14, without the need to set up independent pipes. The first flow channel 11 can directly absorb the heat dissipated by the transformer coil and iron core in the heat generation zone 2.

[0041] In this implementation, the second flow channel 12 is arranged vertically and positioned on the side of the multiple heat dissipation fins 14 away from the center of the heat generation zone 2.

[0042] It should be noted that the second flow channel 12 is located on the outside of the heat dissipation fins 14. It can receive the cooling medium after heat exchange through the inclined flow channel 142, and discharge the heat-carrying cooling medium out of the heat dissipation structure to maintain the circulation of the cooling medium.

[0043] For example, the second flow channel 12 is a vertically extending annular hollow channel, with its inner ring surface and the outer end face of multiple heat dissipation fins 14 fixedly connected. The whole is arranged coaxially with the first flow channel 11 and multiple heat dissipation fins 14, and its upper and lower ends are respectively connected to the main pipe of the cooling medium.

[0044] In this implementation, an inclined flow channel 142 is formed between adjacent heat dissipation fins 14, and the inclined flow channel 142 can connect the first flow channel 11 and the second flow channel 12.

[0045] It should be noted that the inclined flow channel 142 extends along the funnel-shaped contour of the heat dissipation fins 14, and is inclined outward from the first flow channel 11 to the second flow channel 12. This gradually expanding funnel-shaped inclined structure has significant advantages in fluid dynamics: on the one hand, the flow cross-sectional area of ​​the inclined flow channel 142 gradually increases along the flow direction, and the flow velocity gradually decreases, prolonging the residence time of the transformer oil on the surface of the heat dissipation fins 14 and enhancing the adequacy of heat exchange; on the other hand, the curved wall of the funnel shape can guide the fluid to change its flow direction, generate secondary flow, disrupt the stability of the laminar boundary layer, and thin the thermal boundary layer thickness, thereby significantly improving the convective heat transfer coefficient. Compared with conventional straight-walled parallel flow channels, the funnel-shaped inclined flow channel 142 of this application can effectively eliminate flow dead zones, remove more heat under the same pumping power (natural convection driving force), and improve the efficiency of the heat dissipation structure.

[0046] For example, since the multiple heat dissipation fins 14 are funnel-shaped structures that are parallel to each other, the gap between two adjacent heat dissipation fins 14 extends radially outward at an angle. The inner end of the gap is connected to the first flow channel 11, and the outer end is connected to the second flow channel 12. This gap is the inclined flow channel 142 after it is formed.

[0047] It should be noted that when the inclined flow channel 142 connects the first flow channel 11 and the second flow channel 12, the cooling medium can first enter the first flow channel 11 to absorb the heat transferred from the heat generation zone 2, and then flow outward along the inclined flow channel 142. During the flow process, it continuously exchanges heat with the heat dissipation fins 14, and finally flows into the second flow channel 12 to complete the discharge.

[0048] It should be noted that multiple heat dissipation fins 14 can be connected to the sidewall of the second flow channel 12 by connecting ribs to fix the multiple heat dissipation fins 14.

[0049] In some implementations, the first flow channel 11, the second flow channel 12, the third flow channel 13 and the inclined flow channel 142 are used to circulate transformer oil. The third flow channel 13 is connected to both ends of the first flow channel 11 and the second flow channel 12 respectively, and the third flow channel 13 is located on the side away from the heat generation zone 2 to dissipate heat from the transformer oil.

[0050] In this implementation, transformer oil can flow inside the first flow channel 11, the second flow channel 12, the third flow channel 13, and the inclined flow channel 142. The transformer oil can serve as a thermally conductive and insulating medium, while simultaneously carrying heat and providing insulation.

[0051] In this implementation, the third flow channel 13 is connected to both ends of the first flow channel 11 and both ends of the second flow channel 12.

[0052] It should be noted that the third flow channel 13 connects to both ends, providing a closed circulation loop for the transformer oil, and the overall circulation can be completed without the need for additional external pipelines.

[0053] For example, at the upper end, the third flow channel 13 is connected to the upper outlet of the first flow channel 11 and the upper inlet of the second flow channel 12. At the lower end, the third flow channel 13 is connected to the lower inlet of the first flow channel 11 and the lower outlet of the second flow channel 12, forming two complete connected nodes.

[0054] In this implementation, the third flow channel 13 is located on the side away from the heat generation zone 2, which can dissipate heat from the circulating transformer oil.

[0055] It should be noted that the third flow channel 13 is far from the core heat-generating zone 2, and its outer wall can directly contact the external environment, dissipating the heat it carries into the external environment and reducing the temperature of the transformer oil.

[0056] For example, after absorbing heat from the heat-generating zone 2 in the first flow channel 11, the transformer oil's temperature rises and its density decreases. Under the action of buoyancy, it flows upward, converges at the upper outlet of the first flow channel 11, and enters the upper third flow channel 13. As the hot oil flows along the third flow channel 13, it dissipates heat to the outside, its temperature decreases, and its density increases. Under the action of gravity, it sinks downward and flows to the lower part of the third flow channel 13. Subsequently, it flows back into the first flow channel 11 from the lower inlet, forming a natural circulation flow of "hot oil rising and cold oil falling". At the same time, some transformer oil is diverted into the inclined flow channel 142 during its upward flow. After exchanging heat with the heat dissipation fins 14, it flows into the second flow channel 12. The transformer oil in the second flow channel 12 is heated and rises to the upper connection point to enter the third flow channel 13 to participate in the heat dissipation circulation.

[0057] It should be noted that when the third flow channel 13 dissipates heat from the transformer oil, the transformer oil carrying heat flows into the interior of the third flow channel 13. The heat is transferred from the transformer oil to the inner wall of the third flow channel 13, and then conducted to the outer wall of the third flow channel 13. Finally, it is dissipated into the external environment through convection and radiation, reducing the temperature of the transformer oil itself. The density of the cooled transformer oil increases, and it can flow smoothly downward along the third flow channel 13 under the action of gravity, thereby driving the transformer oil to form a continuous natural convection circulation within the overall structure.

[0058] For example, additional auxiliary heat dissipation fins can be installed on the outer wall of the third flow channel 13. When the transformer oil flows in the channel, heat is transferred to the auxiliary heat dissipation fins through the wall, increasing the contact area with the outside air and improving the efficiency of heat dissipation.

[0059] Through this implementation, the transformer oil enters the first flow channel and fully contacts the surface of the heat-generating zone to absorb heat. Then, the hot oil flows along the inclined flow channel to the second flow channel, where it fully contacts the funnel-shaped heat dissipation fins to conduct heat. Finally, the hot oil enters the third flow channel to complete the cooling process. Overall, this can significantly improve the heat transfer efficiency, quickly remove the heat generated by the transformer coils and core, and avoid the problem of localized overheating in the heat-generating zone.

[0060] With this implementation, the funnel-shaped heat dissipation fins are arranged in parallel, and the through holes in the middle directly enclose the heat generation zone. The flow channels are directly attached to the heat dissipation fin structure, eliminating the need for additional complex heat exchange support structures. The overall structure is more compact, can adapt to the installation space of transformers of different specifications, and reduces the assembly difficulty and manufacturing cost of the overall structure.

[0061] Through this implementation, the first flow channel, the second flow channel, the third flow channel and the inclined flow channel form a closed transformer oil circulation loop. The heat carried out by the hot oil from the heat generation zone can be gradually dissipated through multiple flow channels. The heat dissipation fins are arranged in parallel, so that there will be no dead zone for heat exchange during the circulation of transformer oil, which can maintain a long-term stable heat dissipation capacity and extend the service life of the transformer.

[0062] like Figure 2 As shown in the embodiments of this application, another heat dissipation structure for transformers is also provided, which will be described in detail below.

[0063] In some implementations, the lowest heat dissipation fin 14 among the multiple heat dissipation fins 14 is provided with a sealing fin 143 in the circumferential direction, and the sealing fin 143 is sealed to the side wall of the second flow channel 12.

[0064] In this implementation, the heat dissipation fin 14 located at the lowest position in the overall stacked structure among the multiple heat dissipation fins 14 is provided with sealing fins 143 in the circumferential direction.

[0065] It should be noted that the sealing fin 143 is an annular sealing structure integrally formed or spliced ​​and fixed around the heat dissipation fin 14 at the lowest position, preventing the transformer oil after passing through the third flow channel 13 from directly entering the second flow channel 12 from the heat dissipation fin 14 at the lowest position, so that the transformer oil enters the first flow channel 11 for heat dissipation circulation again.

[0066] For example, the sealing fin 143 is an annular flange structure, made of the same aluminum alloy material as the heat dissipation fin 14, and has good thermal conductivity. Its overall thickness is greater than the body thickness of the heat dissipation fin 14, which can ensure the structural strength after sealing connection.

[0067] It should be noted that the sealing fins 143 are arranged around the circumference of the lowest heat dissipation fin 14 and are set on the same axis as the heat dissipation fin 14, which can seal the second flow channel 12 that is open at the lower end.

[0068] In this implementation, the sealing fin 143 and the sidewall of the second flow channel 12 are sealed together.

[0069] For example, the sidewall of the second flow channel 12 is an annular cylindrical structure, and an annular sealing groove matching the shape of the sealing fin 143 is opened on the lower end face. The sealing fin 143 is embedded in the annular sealing groove, and then oil-resistant sealant is applied to the mating surface to complete the sealing connection.

[0070] Through this implementation, the sealing fins circumferentially arranged on the heat dissipation fins at the lowest position are sealed and connected to the side wall of the second flow channel, ensuring that the transformer oil in the first flow channel, second flow channel, third flow channel and inclined flow channel circulates along a preset path, thus stabilizing the heat exchange efficiency.

[0071] Through this implementation, the sealing fins and the second flow channel sidewall are sealed together, which can fix the low-position heat dissipation fins, reduce the probability of the heat dissipation fins shifting due to the impact of transformer oil flow, avoid changes in the flow area of ​​the inclined flow channel, ensure the heat exchange uniformity between each heat dissipation fin, and improve the overall operational reliability.

[0072] Figure 3 A schematic cross-sectional view of the second heat dissipation structure for a transformer provided in this application embodiment is shown below. Figure 3 As shown in the embodiments of this application, another heat dissipation structure for transformers is also provided, which will be described in detail below.

[0073] In some implementations, the sidewall of the connecting section at the bottom of the third flow channel 13 and the first flow channel 11 and the second flow channel 12 is flush with the height of the sealing fin 143. A transverse filter assembly 15 is provided in the connecting section at the bottom of the third flow channel 13 and the first flow channel 11 and the second flow channel 12. The transverse filter assembly 15 is connected to the sidewall of the third flow channel 13 by a threaded seal. The end of the transverse filter assembly 15 is provided with an inclined surface 151 that abuts against the sidewall of the heat dissipation fin 11. The top of the transverse filter assembly 15 is provided with a top sealing surface 152 that fits against the bottom of the sealing fin 143. When the transformer oil flows through the connecting section at the bottom of the third flow channel 13 and the first flow channel 11 and the second flow channel 12, it can flow through the transverse filter assembly 15 for filtration.

[0074] In this implementation, the sidewall of the bottom connecting section of the third flow channel 13 and the first flow channel 11 and the second flow channel 12 is flush with the height of the sealing fin 143.

[0075] In this implementation, a transverse filter component 15 is provided in the connecting section at the bottom of the third flow channel 13 and the first flow channel 11 and the second flow channel 12.

[0076] It should be noted that the transverse filter assembly 15 is used to filter solid particles such as insulating impurities mixed in the circulating transformer oil.

[0077] For example, the transverse filter assembly 15 is a cylindrical structure with an oil passage cavity inside. An oil-resistant stainless steel filter screen is installed inside the oil passage cavity. The mesh size of the filter screen can meet the requirements of blocking most impurities, while not causing excessive obstruction to the flow of transformer oil.

[0078] In this implementation, the transverse filter assembly 15 is connected to the side wall of the third flow channel 13 by a threaded seal.

[0079] It should be noted that the threaded sealing connection allows for the detachable installation of the transverse filter assembly 15, facilitating regular disassembly and cleaning of filtered impurities, while ensuring that transformer oil will not leak at the connection point.

[0080] For example, the side wall of the third flow channel 13 is provided with an installation through hole with internal thread, and the outer cylindrical surface of the transverse filter assembly 15 is machined with matching external thread. During installation, oil-resistant sealing tape is wrapped around the thread surface, and then the transverse filter assembly 15 is screwed into the installation through hole to complete the connection.

[0081] In this implementation, the end of the horizontal filter component 15 is provided with an inclined surface 151, which can abut against the side wall of the heat sink fin 14.

[0082] It should be noted that the tilt angle of the inclined surface 151 is consistent with the tilt angle of the side wall of the corresponding heat dissipation fin 14. After contact, they can fit together and seal, preventing transformer oil from bypassing the filter structure through the gap.

[0083] For example, one end of the horizontal filter component 15 that extends into the connecting section is the end, and the end is processed into an inwardly inclined slope. The slope angle is exactly the same as the side wall slope angle of the heat dissipation fin 14 at the lowest position. After processing, the inclined surface 151 is polished to improve the fitting accuracy.

[0084] In this implementation, a top sealing surface 152 is provided on the top of the horizontal filter assembly 15, and the top sealing surface 152 can fit with the bottom of the sealing fin 143.

[0085] It should be noted that the top sealing surface 152 is a planar structure that fits perfectly with the bottom surface of the horizontally placed sealing fin 143, which can seal the gap between the top of the transverse filter assembly 15 and the sealing fin 143 and prevent oil bypass.

[0086] In this implementation, when the transformer oil flows through the connecting section at the bottom of the third flow channel 13 and the first flow channel 11 and the second flow channel 12, it can flow through the transverse filter assembly 15 to complete the filtration.

[0087] It should be noted that the inclined surface 151 abuts against the side wall of the heat dissipation fin 14, and the top sealing surface 152 fits against the bottom of the sealing fin 143. The two work together to form a complete sealing structure, which separates the connection section into an oil inlet side and an oil outlet side. All oil must pass through the transverse filter assembly 15 before flowing to the subsequent path.

[0088] For example, after the transformer oil flows out from the second flow channel 12, it flows into the oil inlet side of the connecting section. Impurities are trapped on the oil inlet side by the filter screen. The filtered transformer oil passes through the filter screen and enters the oil outlet side. Then it flows into the bottom of the first flow channel 11 along the flow channel of the third flow channel 13 and continues to participate in the heat exchange process of the next cycle.

[0089] In this implementation, a transverse filter assembly is installed in the bottom connection section between the third flow channel and the first and second flow channels. When the transformer oil circulates through this connection section, it will pass through the transverse filter assembly, which can filter out impurities such as scale in the oil, prevent impurities from clogging the inclined flow channel, ensure smooth flow of transformer oil, and stabilize the overall heat exchange efficiency.

[0090] With this implementation, the top sealing surface of the transverse filter assembly fits snugly against the bottom of the sealing fins, and the inclined surface at the end abuts against the side wall of the heat dissipation fins. This fills the assembly gaps and prevents unfiltered transformer oil from flowing through the gaps. At the same time, the transverse filter assembly is connected to the side wall of the third flow channel via a threaded seal, allowing for disassembly and replacement without disassembling the entire structure, thus reducing maintenance difficulty. The side wall of the bottom connecting section of the third flow channel and the first and second flow channels is flush with the height of the sealing fins. Combined with the sealing structure of the transverse filter assembly, this reduces the eddy current area in the connecting section, lowers the flow resistance of the transformer oil, and reduces the flow resistance during the circulation process.

[0091] like Figure 2 As shown in the embodiments of this application, another heat dissipation structure for transformers is also provided, which will be described in detail below.

[0092] In some implementations, a filter 144 is provided between the center of each heat dissipation fin 14 and the coil and / or iron core of the heat generation zone 2, and the filter 144 is provided with a first microporous structure for filtering transformer oil.

[0093] It should be noted that the core purpose of this implementation is to adjust the flow resistance within the first flow channel 11 using the filter 144. Since the first flow channel 11 is adjacent to the heat-generating zone 2, the transformer oil has a strong upward force after being heated. Without obstruction, most of the transformer oil would tend to rise vertically directly along the first flow channel 11, resulting in insufficient flow in the inclined flow channel 142 and reduced heat exchange efficiency of the heat dissipation fins 14. By setting the filter 144 with a microporous structure, the friction resistance of the first flow channel 11 is artificially increased, forcing more transformer oil to flow into the relatively less resistant inclined flow channel 142 under the pressure difference. This allows for on-demand distribution of the transformer oil flow between the first flow channel 11 and the inclined flow channel 142, ensuring that the heat dissipation fins 14 fully participate in heat exchange and improving overall heat dissipation uniformity. Simultaneously, the microporous structure of the filter 144 has an additional beneficial effect of filtering impurities from the flowing transformer oil, reducing wear on the coils and core caused by impurities.

[0094] In this implementation, a filter 144 is provided between the center of each heat dissipation fin 14 and the coil and / or iron core of the heat generation zone 2.

[0095] It should be noted that the filter element 144 is an annular sheet structure made of oil-resistant and insulating material, which can simultaneously filter impurities and adjust flow resistance, and is compatible with the annular structure arrangement of the first flow channel 11.

[0096] For example, the filter 144 is an overall annular sheet structure, with the inner ring diameter matching the outer diameter of the heat generation zone 2 and the outer ring diameter matching the outer diameter of the first flow channel 11, completely covering the radial section of the first flow channel 11, and installed on the side end face of each heat dissipation fin 14 near the center.

[0097] In this implementation, a first microporous structure is provided on the filter 144, which is used to filter the transformer oil flowing through it.

[0098] It should be noted that the first microporous structure is uniformly distributed on the surface of the filter plate 144, and the pore size is smaller than the pore size of the filter screen of the transverse filter assembly 15. This can further filter out fine impurities and at the same time, it can hinder the flow of transformer oil to a certain extent.

[0099] In this implementation, the filter 144 is used to filter the transformer oil flowing through the first flow channel 11, and at the same time, it is used to increase the flow resistance of the transformer oil in the first flow channel 11 so that the transformer oil flows through the inclined flow channel 142.

[0100] It should be noted that the filter 144 covers the entire radial cross-section of the first flow channel 11. The transformer oil can only pass through the filter 144 through the first microporous structure. The flow cross-sectional area is reduced, which can increase the flow resistance of the vertical flow in the first flow channel 11 and cause more transformer oil to be diverted from the first flow channel 11 into the inclined flow channel 142.

[0101] It should be noted that the micropore diameter of the filter 144 corresponding to the multiple heat dissipation fins 14 from bottom to top gradually decreases in order to avoid insufficient transformer oil flow at the top heat dissipation fins 14 and improve the uniformity of heat dissipation effect on the heat generation zone 2.

[0102] In this implementation, a filter with a first microporous structure is set between the center of each heat dissipation fin and the coil and / or iron core in the heat generation zone. When the transformer oil flows through the first flow channel, it will pass through the filter, which can further filter out tiny impurities in the oil, prevent impurities from entering the inclined flow channel and causing blockage, and at the same time reduce the wear of impurities on the coil and iron core, ensuring the service life of the transformer's core components.

[0103] By implementing this method, the filter can increase the flow resistance of the transformer oil in the first flow channel, allowing more transformer oil to flow smoothly into the inclined flow channel and fully contact the heat exchange fins for heat exchange. This avoids the problem that the transformer oil only flows vertically in the first flow channel and does not enter the inclined flow channel, thereby improving the utilization rate of the heat exchange fins and enhancing the overall heat exchange effect.

[0104] In some implementations, the transverse filter assembly 15 is provided with a second microporous structure for filtering transformer oil. The micropore diameter of the second microporous structure is larger than that of the first microporous structure, so that the transformer oil can be filtered step by step through the transverse filter assembly 15 and the filter sheet 144.

[0105] In this implementation, a second microporous structure is provided on the transverse filter assembly 15, which is used to filter the transformer oil flowing through it.

[0106] It should be noted that the second microporous structure is processed on the filter body of the transverse filter component 15 and is evenly distributed throughout. It is used to complete the primary filtration in the front section of the circulation path and intercept large particulate impurities.

[0107] In this implementation, the micropore diameter of the second micropore structure is larger than that of the first micropore structure, and the transformer oil can be filtered step by step through the cooperation of the transverse filter assembly 15 and the filter sheet 144.

[0108] It should be noted that the step-by-step filtration is arranged in the order of coarse filtration followed by fine filtration. Large particles of impurities are first intercepted by the horizontal filter component 15, and then small impurities are intercepted by the filter plate 144. This can prevent large particles of impurities from clogging the first microporous structure of the filter plate 144 and extend the service life of the filter structure.

[0109] For example, transformer oil carrying impurities of different particle sizes flows from the second flow channel 12 into the bottom connection section and enters the transverse filter assembly 15. Impurities with a particle size larger than the diameter of the second micropore are trapped on the oil inlet side of the transverse filter assembly 15. The oil after primary filtration flows into the first flow channel 11. During the upward flow, each time it passes through a filter plate 144, fine impurities with a particle size larger than the diameter of the first micropore are trapped. Finally, the fully filtered transformer oil is diverted into the inclined flow channel 142 for heat exchange.

[0110] With this implementation, the micropore diameter of the second micropore structure of the transverse filter assembly is larger than the micropore diameter of the first micropore structure of the filter sheet. When the transformer oil circulates, it first passes through the transverse filter assembly to remove large-sized impurities, and then passes through the filter sheet to remove small impurities, forming a step-by-step filtration system. This can reduce the risk of filter sheet clogging, extend the filter sheet replacement cycle, and reduce overall maintenance costs.

[0111] By implementing this method, the step-by-step filtration setup can reduce the resistance burden of the filter on the transformer oil. While ensuring the filtration effect, it maintains the original flow-limiting function of the filter, ensuring that the transformer oil can flow evenly into each layer of inclined flow channels, ensuring that the heat exchange efficiency of each heat dissipation fin is consistent, and further improving the overall heat dissipation stability.

[0112] Figure 4 This is a schematic cross-sectional view of the third heat dissipation structure for a transformer provided in an embodiment of this application. Figure 5 A partial structural diagram at point B of the third heat dissipation structure for a transformer provided in this application embodiment is shown below. Figure 4 and Figure 5 As shown in the embodiments of this application, another heat dissipation structure for transformers is also provided, which will be described in detail below.

[0113] In some implementations, multiple heat dissipation fins 14 extend to the outside of the sidewall of the second flow channel 12 to form external fins 16, which are located between the sidewall of the second flow channel 12 and the sidewall of the third flow channel 13.

[0114] In this implementation, multiple heat dissipation fins 14 extend out of the sidewall of the second flow channel 12, and the extended portion forms an external fin 16.

[0115] It should be noted that the external fins 16 and the heat dissipation fins 14 are integrally formed, which can directly conduct the heat absorbed by the heat dissipation fins 14 to the space between the second flow channel 12 and the third flow channel 13, thereby helping to improve the overall heat dissipation efficiency.

[0116] For example, the portion extending from the large-diameter end of each heat dissipation fin 14 is the outer fin 16. The outer fin 16 maintains the original funnel-shaped inclined profile of the heat dissipation fin 14, and its thickness is consistent with that of the heat dissipation fin 14 body. It is made of the same thermally conductive metal material.

[0117] In this implementation, the external fin 16 is disposed between the sidewall of the second flow channel 12 and the sidewall of the third flow channel 13.

[0118] It should be noted that after the multiple heat dissipation fins 14 extend out of the side wall of the second flow channel 12, the extended section is naturally located in the annular space between the outer side of the side wall of the second flow channel 12 and the inner side of the side wall of the third flow channel 13. Appropriate through holes can be opened at the corresponding positions of the side wall of the second flow channel 12 for the heat dissipation fins 14 to pass through.

[0119] For example, the sidewall of the second flow channel 12 is circumferentially machined with openings that match the contour of each heat dissipation fin 14. After each heat dissipation fin 14 passes through the corresponding opening, the edge of the opening and the outer wall of the heat dissipation fin 14 are welded and sealed to prevent transformer oil leakage inside the second flow channel 12.

[0120] In some implementations, the first flow channel 11 is vertically disposed between the center of the plurality of heat dissipation fins 14 and the heat generation zone 2, and the second flow channel 12 is vertically disposed on the side of the plurality of heat dissipation fins 14 away from the heat generation zone 2.

[0121] In this implementation, the first flow channel 11 is arranged in the vertical direction and is located between the center of multiple heat dissipation fins 14 and the heat generation zone 2.

[0122] In this implementation, the second flow channel 12 is vertically arranged on the side of the multiple heat dissipation fins 14 away from the center of the heat generation zone 2.

[0123] It should be noted that the second flow channel 12 vertically passes through the multi-layer stacked heat dissipation fins 14. Each heat dissipation fin 14 has a corresponding through hole. The second flow channel 12 is formed by connecting multiple through holes. The transformer oil in the second flow channel 12 can contact each heat dissipation fin 14 to transfer heat.

[0124] For example, multiple heat dissipation fins 14 are stacked vertically, and each heat dissipation fin 14 has a circular through hole machined at the large diameter end away from the center. The through holes of all heat dissipation fins 14 are coaxially aligned, and the second flow channel 12 is a vertically extending wall-less structure.

[0125] In this implementation, the heat dissipation fins extend to the outside of the second flow channel sidewall to form external fins, which are set between the second and third flow channel sidewalls. The heat from the hot oil in the second flow channel can be quickly diffused outward through the external fins, while also assisting in the heat dissipation of the transformer oil in the third flow channel, further improving the overall heat dissipation efficiency and accelerating the cooling speed of the transformer oil. The external fins are formed by extending the original heat dissipation fins, eliminating the need for additional independent heat dissipation components, which simplifies the overall assembly process. At the same time, the heat dissipation area is expanded without occupying too much lateral space, making it suitable for more compact transformer installation scenarios and improving the applicability of the structure.

[0126] With this implementation, the second flow channel is vertically installed on the side of multiple heat dissipation fins away from the heat generation area. The hot oil flowing out of each inclined flow channel can directly flow into the second flow channel, reducing the turning resistance of the oil flow, making the transformer oil circulation smoother, and shortening the heat transfer path, so that the heat absorbed by the heat dissipation fins can be conducted to the external fins outside the second flow channel more quickly and dissipated.

[0127] In some implementations, the outer fin 16 is provided with drainage holes for draining rainwater.

[0128] In this implementation, a drainage hole is provided on the outer fin 16, which allows rainwater entering the gap between the side wall of the second flow channel 12 and the side wall of the third flow channel 13 to be discharged.

[0129] It should be noted that the drainage hole is an open structure that penetrates the body of the external fin 16, which can break the obstruction of rainwater by the external fin 16, allowing rainwater to flow smoothly out of the gap in the vertical direction and preventing rainwater from accumulating inside the gap.

[0130] For example, the drain hole is a circular through-hole, which is directly machined onto the outer fin 16 body using a stamping process. The edges of the hole are polished to remove burrs and prevent scratches to operators during installation and maintenance.

[0131] It should be noted that the drainage holes are arranged at the lower position of the outer fin 16. Each outer fin 16 can have one or more drainage holes opened according to the size of the fin, so that all the accumulated rainwater can flow downward through the drainage holes and be discharged.

[0132] With this implementation, drainage holes are provided on the external fins. When it rains outdoors, rainwater falling on the external fins can be quickly discharged downwards through the drainage holes, preventing rainwater from accumulating in the gaps of the external fins, reducing the risk of the external fins being corroded by rainwater, and extending the service life of the external fins.

[0133] Through this implementation, the drain hole can prevent rainwater from accumulating and forming a water film that obstructs the heat dissipation surface of the external fins, ensuring a stable contact area between the external fins and the air, maintaining the heat exchange efficiency of the external fins, and preventing rainwater residue from affecting the heat dissipation effect of the transformer oil in the second and third flow channels, thus ensuring stable overall heat dissipation capacity.

[0134] like Figure 4 and Figure 5 As shown in the embodiments of this application, another heat dissipation structure for transformers is also provided, which will be described in detail below.

[0135] In some implementations, a vertical filter assembly 17 is also included. The vertical filter assembly 17 is vertically disposed in the second flow channel 12. The vertical filter assembly 17 is connected to the top of the connection section between the second flow channel 12 and the third flow channel 13 by a threaded seal. The transverse filter assembly 15 is provided with a third microporous structure for filtering transformer oil. The micropore diameter of the third microporous structure is larger than that of the first microporous structure, so that the transformer oil can be filtered step by step through the transverse filter assembly 15 and the filter sheet 144.

[0136] In this implementation, the overall structure also includes a vertical filter component 17, which is disposed inside the second flow channel 12 in a vertical direction.

[0137] It should be noted that the vertical filter assembly 17 is a columnar filter structure extending axially along the second flow channel 12. The entire assembly is arranged coaxially with the second flow channel 12, which can perform pre-filtration of the transformer oil that is about to flow into the third flow channel 13.

[0138] For example, the vertical filter assembly 17 is a cylindrical structure with a filter wall and a hollow oil passage inside. It is made of oil-resistant stainless steel and can be installed to fit the inner diameter of the second flow channel 12.

[0139] In this implementation, the vertical filter assembly 17 is connected to the top of the connecting section between the second flow channel 12 and the third flow channel 13 via a threaded seal.

[0140] It should be noted that the threaded sealing connection allows for the detachable installation of the vertical filter assembly 17, facilitating the regular cleaning of trapped impurities, while ensuring that transformer oil will not leak at the connection point.

[0141] In this implementation, a third microporous structure is provided on the vertical filter component 17. The third microporous structure is used to filter the transformer oil flowing through it. The micropore diameter of the third microporous structure is larger than that of the first microporous structure, and it can work with the filter sheet 144 to filter the transformer oil step by step.

[0142] It should be noted that the third microporous structure is evenly distributed on the cylindrical wall of the vertical filter component 17, and its pore size is larger than that of the first microporous structure. This enables a step-by-step filtration logic of coarse filtration followed by fine filtration, thus preventing large particles of impurities from clogging the subsequent fine filtration structure.

[0143] For example, transformer oil carrying impurities of different particle sizes flows downward from the upper end of the second flow channel 12, first passing through the cylinder wall of the vertical filter assembly 17 from the outside. Impurities with a particle size larger than the diameter of the third micropore are trapped on the outside of the vertical filter assembly 17. The filtered oil enters the hollow cavity inside the vertical filter assembly 17, and then flows downward into the bottom connection section of the second flow channel 12 and the third flow channel 13. Subsequently, it enters the first flow channel 11 and passes through the first micropore structure of each filter element 144 to complete fine filtration, thus achieving step-by-step filtration.

[0144] With this implementation, the vertical filter assembly is vertically arranged in the second flow channel. When the transformer oil flows downward from the inclined flow channel into the second flow channel, it will first pass through the vertical filter assembly to remove impurities, further improving the cleanliness of the oil, preventing impurities from entering the third flow channel, reducing the filtration load of the horizontal filter assembly, and extending the replacement cycle of the horizontal filter assembly.

[0145] With this implementation, the vertical filter assembly is connected to the top of the connection section between the second and third flow channels via a threaded seal. There is no need to disassemble the internal structure of the second flow channel; disassembly and replacement can be completed from the top alone, which greatly reduces the difficulty of maintenance operations and minimizes the impact on the overall heat dissipation circuit during maintenance.

[0146] In this implementation, the micropore diameter of the third micropore structure is larger than that of the first micropore structure. Together with the vertical filter component, a three-stage filtration system is formed, which can trap impurities of different sizes in layers. This ensures the filtration effect while preventing the small-sized filter structure from clogging too quickly, maintaining the smooth flow of transformer oil in the flow channel, and ensuring stable heat dissipation efficiency.

[0147] Figure 6 This application provides a schematic diagram of a control structure for a heat dissipation structure of a transformer, as shown in the embodiment of the present application. Figure 6 As shown in the embodiments of this application, another heat dissipation structure for transformers is also provided, which will be described in detail below.

[0148] In some implementations, a blockage clearing controller 3 is also included. A temperature sensor 31 for detecting transformer oil temperature is provided on the third flow channel 13. The temperature sensor 31 and the blockage clearing controller 3 are electrically connected. When the temperature sensor 31 detects that the transformer oil temperature is greater than or equal to the preset transformer oil temperature, the blockage clearing controller 3 issues a prompt message for replacing the horizontal filter assembly 15 or the vertical filter assembly 17.

[0149] This implementation also includes a blockage clearing controller 3 and a temperature sensor 31 installed on the third flow channel 13. The temperature sensor 31 is used to detect the temperature of the transformer oil in the third flow channel 13.

[0150] It should be noted that the detection end of the temperature sensor 31 extends into the third flow channel 13, allowing it to directly contact the flowing transformer oil and obtain accurate oil temperature data. The installation location is sealed to prevent transformer oil leakage.

[0151] For example, a mounting through hole is opened on the side wall of the third flow channel 13, and the detection end of the temperature sensor 31 extends into the interior of the third flow channel 13 through the mounting through hole. The sensor head directly contacts the transformer oil. The mounting base and the side wall of the third flow channel 13 are welded and sealed, and fixed on the outside of the side wall of the third flow channel 13.

[0152] In this implementation, the temperature sensor 31 and the blockage clearing controller 3 are electrically connected.

[0153] It should be noted that the electrical connection can transmit the temperature signal detected by the temperature sensor 31 to the unblocking controller 3 in real time, so that the unblocking controller 3 can process and judge the temperature signal.

[0154] In this implementation, when the temperature sensor 31 detects that the transformer oil temperature is greater than or equal to the preset transformer oil temperature, the unblocking controller 3 issues a prompt message, prompting the replacement of the horizontal filter assembly 15 or the vertical filter assembly 17.

[0155] It should be noted that when the filter assembly becomes clogged, the transformer oil circulation flow rate decreases, the overall heat dissipation efficiency decreases, and the transformer oil temperature in the third flow channel 13 will rise abnormally. The clogging status of the filter assembly can be indirectly judged by the temperature change.

[0156] It should be noted that after the blockage clearing controller 3 receives the temperature signal transmitted by the temperature sensor 31, it compares the detected temperature value with the internal preset temperature threshold. When the detected temperature is greater than or equal to the preset temperature threshold, it triggers the prompt module to issue a replacement prompt message.

[0157] For example, after the blockage clearing controller 3 completes the comparison, if the triggering conditions are met, the blockage clearing controller 3 sends a trigger signal to the connected audio-visual prompting module. The prompting module lights up the warning light and emits a prompting sound to remind the operator to replace the blocked horizontal filter component 15 or vertical filter component 17.

[0158] This implementation method uses a temperature sensor to monitor the transformer oil temperature in the third flow channel in real time. When the detected transformer oil temperature is greater than or equal to the preset transformer oil temperature, the signal is transmitted to the unblocking controller, which issues a replacement prompt. This promptly reminds staff to check for filter component blockage, preventing excessively high transformer operating temperatures due to decreased heat exchange efficiency and improving operational safety. Furthermore, it eliminates the need for frequent manual disassembly and inspection of the horizontal and vertical filter components; temperature monitoring alone is sufficient to indirectly determine if the filter components are blocked, reducing the workload of daily inspections, minimizing unnecessary disassembly and assembly operations, and improving maintenance efficiency.

[0159] With this implementation, the temperature sensor is directly installed on the third flow channel, which can directly obtain the transformer oil temperature data after heat dissipation. The judgment result is more consistent with the actual heat dissipation effect, avoiding false alarms, ensuring the accuracy of the prompt information, and reducing unnecessary maintenance costs.

[0160] In some implementations, the heat dissipation structure of this application also possesses a self-cleaning function utilizing fluid pulsation. It should be noted that during actual operation, the load on the transformer often fluctuates, causing the thermal power of the heat-generating zone 2 to change accordingly. When the load increases, the temperature of the heat-generating zone 2 rises, increasing the thermal buoyancy of the transformer oil in the first flow channel 11 and accelerating its flow rate. The shear force of the fluid flowing through the micropores of the filter 144 on the blockage increases instantaneously, capable of flushing away loose impurities adhering to the surface of the micropores, thus achieving a reverse self-cleaning effect. Simultaneously, the design of the inclined flow channel 142 allows the transformer oil to flow along the inclined wall under centrifugal force, making it less likely for dead zones to accumulate on the surface of the filter 144. This self-cleaning mechanism utilizing operating condition fluctuations can, to a certain extent, extend the maintenance cycle of the filter assembly, prevent complete failure of the circulation loop due to minor blockages, and improve the robustness of the system.

[0161] This application also provides an oil-immersed transformer, including the above-mentioned heat dissipation structure for the transformer, and further including a coil and an iron core, which are disposed in the heat generation zone 2.

[0162] With this implementation, the coils and core of the oil-immersed transformer are located within the heat-generating zone. The heat generated during operation can be directly absorbed by the transformer oil in the adjacent first flow channel, and then cooled down through the entire heat dissipation structure. This quickly removes heat from the core components, preventing the coils and core from aging and being damaged due to excessive temperature, thus extending the overall service life of the oil-immersed transformer. The oil-immersed transformer is equipped with a complete heat dissipation structure, with the flow channels and heat dissipation components integrated and arranged, eliminating the need for additional external heat dissipation devices. The overall structure is more compact, reducing the overall size of the oil-immersed transformer, lowering installation space requirements, and adapting to more diverse application scenarios.

[0163] Through this implementation, oil-immersed transformers can reduce the workload of daily operation and maintenance by utilizing the multi-stage filtration and blockage indication functions of the heat dissipation structure. At the same time, the heat dissipation efficiency is more stable, which can reduce the probability of operational failure of oil-immersed transformers and improve the reliability and safety of long-term operation.

[0164] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A heat dissipating structure for a transformer, characterized by, It includes a first flow channel, a second flow channel, a third flow channel, and multiple heat dissipation fins. The multiple heat dissipation fins are funnel-shaped and arranged in parallel with each other. Each heat dissipation fin has a through hole in the middle. The through holes of the multiple heat dissipation fins have heat generation zones for accommodating the transformer coil and iron core. The first flow channel is vertically arranged between the center of multiple heat dissipation fins and the heat generation area, and the second flow channel is vertically arranged on the center side of multiple heat dissipation fins away from the heat generation area. An inclined flow channel connecting the first flow channel and the second flow channel is formed between the multiple heat dissipation fins. The first flow channel, the second flow channel, the third flow channel, and the inclined flow channel are used to circulate transformer oil. The third flow channel is connected to both ends of the first and second flow channels respectively, and the third flow channel is located on the side away from the heat generation area to dissipate heat from the transformer oil.

2. The heat dissipation structure for a transformer according to claim 1, characterized in that, The lowest heat dissipation fin among the multiple heat dissipation fins has a sealing fin on its circumference, and the sealing fin is sealed to the side wall of the second flow channel.

3. The heat dissipation structure for a transformer according to claim 2, characterized in that, The sidewall of the connecting section between the third flow channel and the bottom of the first and second flow channels is flush with the height of the sealing fins. A transverse filter assembly is provided in the connecting section between the third flow channel and the bottom of the first and second flow channels. The transverse filter assembly is connected to the sidewall of the third flow channel by a threaded seal. The end of the transverse filter assembly has an inclined surface that abuts against the sidewall of the heat dissipation fins. The top of the transverse filter assembly has a top sealing surface that fits against the bottom of the sealing fins. When the transformer oil flows through the connecting section between the third flow channel and the bottom of the first and second flow channels, it can flow through the transverse filter assembly for filtration.

4. The heat dissipating structure for a transformer according to claim 3, characterized by A filter is provided between the center of each heat dissipation fin and the coil and / or iron core of the heat generation zone. The filter has a first microporous structure for filtering transformer oil. The filter is used to filter the transformer oil flowing through the first flow channel and to increase the flow resistance of the transformer oil in the first flow channel so that the transformer oil can flow through the inclined flow channel.

5. The heat dissipating structure for a transformer according to claim 4, characterized by The transverse filter assembly is provided with a second microporous structure for filtering transformer oil. The micropore diameter of the second microporous structure is larger than that of the first microporous structure, so that the transformer oil can be filtered step by step through the transverse filter assembly and filter sheet.

6. The heat dissipation structure for a transformer according to claim 5, characterized in that, Multiple heat dissipation fins extend to the outside of the sidewall of the second flow channel to form external fins, which are located between the sidewall of the second flow channel and the sidewall of the third flow channel. The first flow channel is vertically positioned between the center of multiple heat dissipation fins and the heat generation zone, while the second flow channel is vertically positioned on the side of multiple heat dissipation fins away from the heat generation zone.

7. The heat dissipation structure for a transformer according to claim 6, characterized in that, The outer fins are equipped with drainage holes for rainwater discharge.

8. The heat dissipating structure for a transformer according to claim 7, characterized by, It also includes a vertical filter assembly, which is vertically arranged in the second flow channel. The vertical filter assembly is connected to the top of the connection section between the second and third flow channels by a threaded seal. The horizontal filter assembly is provided with a third microporous structure for filtering transformer oil. The micropore diameter of the third microporous structure is larger than that of the first microporous structure, so that the transformer oil can be filtered step by step through the horizontal filter assembly and the filter sheet.

9. The heat dissipating structure for a transformer according to claim 8, wherein It also includes a blockage clearing controller. A temperature sensor for detecting transformer oil temperature is installed on the third flow channel. The temperature sensor and the blockage clearing controller are electrically connected. When the temperature sensor detects that the transformer oil temperature is greater than or equal to the preset transformer oil temperature, the blockage clearing controller issues a prompt message for replacing the horizontal or vertical filter components.

10. An oil-immersed transformer, characterized by comprising: The heat dissipation structure for a transformer, as described in any one of claims 1 to 9, further includes a coil and an iron core, wherein the coil and the iron core are disposed within the heat generation zone.

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